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Floristic and Structural Composition of Wonderwoud Forest in the Wolkberg, North-Eastern Transvaal
Item type: Journal Article • Journal: South African Forestry Journal • Authors: C.J. Geldenhuys --- Division of Forest Science and Technology, F.J. Pieterse --- Wolkberg Wilderness Area,The closed, evergreen forest of 450 ha was studied by means of a survey of 55 circular plots of 0,04 ha, distributed in a grid pattern. TWINSPAN classification separated the forest into four stand types: Olea capensis macrocarpa—Xymalos monospora—Syzygium gerrardii... -
Floristic and Structural Composition of Hanglip Forest in the Soutpansberg, Northern Transvaal
Item type: Journal Article • Journal: South African Forestry Journal • Authors: C.J. Geldenhuys --- Division of Forest Science and Technology, B. Murray --- Northern Transvaal Forest Region,The closed, evergreen forest of 363 ha was sampled by means of 62 circular plots of 0,04 ha, distributed in a grid pattern. TWINSPAN classification separated the forest into regrowth forest with two forest types, and mature forest with four... -
Performance of Medicago sativa under dryland conditions on the eastern Highveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N F G Rethman --- Department of Plant Production, J J Odendaal --- Department of Agriculture & Water Supply, Transvaal Region, C C De Witt --- Department of Agriculture & Water Supply, Transvaal Region,Increased livestock numbers and improved animal performance based on dryland lucerne pastures requiring little or no nitrogenous fertilizer have been demonstrated to be feasible on the eastern Highveld. With large scale planting of lucerne‐based pasture (25% of arable land) 350... -
Selecting for palatability in festuca arundinacea schreb
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.C.W. Goodenough --- Department of Agriculture and Water Supply, A. Smith --- Department of Agriculture and Water Supply, A.R.J. Morrison --- Department of Agriculture and Water Supply,Plants of numerous Festuca arundinacea cultivars and strains were evaluated for palatability, using two methods; a relative softness of leaf technique and a grazing technique. The softness of leaf technique, as measured by hand, provided a useful method to distinguish... -
Quantitative description of woody plant communities: Part I. An approach
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.N. Smit --- Department of Agriculture and Water Supply (Transvaal Region), Republic of South AfricaVarious descriptive units for woody plant communities are proposed. These are the Evapotranspiration Tree Equivalent (ETTE), Browse Tree Equivalent (BTE) and Canopied Subhabitat Index (CSI), which describe the status of a woody community in terms of potential moisture use, value... -
Quantitative description of woody plant communities: Part II. Computerized calculation procedures
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.N. Smit --- Department of Agriculture and Water Supply (Transvaal Region), Republic of South AfricaCalculation procedures for various quantitative descriptive unit‐values are described. These procedures are divided into primary and secondary calculations. The former is then divided into the calculation of spatial tree volume and preliminary calculations regarding the complete quantitative description. The latter... -
Changing perceptions of fire management in savanna parks
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.T. Mentis --- Resource Ecology Group, Department of Botany, Republic of South Africa A.W. Bailey --- Department of Plant Science, CanadaParks are managed to preserve their pristine state. Fire has had a varied role in this, depending on shifting paradigms of savanna functioning. Formerly, an equilibrium theory of functioning prevailed where fire was at first an unavoidable evil, and then... -
The value of subtropical grass pastures for use as foggage on the eastern Transvaal Highveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.F.G. Rethman --- , Republic of South Africa C.C. de Witt --- , Republic of South AfricaThe utilization of frosted herbage of Pennisetwn clandestinwn, Paspalum notation, Digitaria eriantha, Cynodon sp. and Chloris gayana by Merino wethers during the winter confirmed the potential of this practice as an alternative winter feeding strategy under Highveld conditions. P. clandestinwn... -
Habitat preferences of twenty‐three grass species in the Bankenveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: F.P. Jordaan --- Department of Agricultural Development, Highveld Region, Republic of South Africa A.S. de Beer --- Department of Agricultural Development, Highveld Region, Republic of South AfricaSome grass species occur more frequently in certain habitats than in others. There is, however, uncertainty as to exactly which factors are responsible for this phenomenon. Species composition as well as habitat data were collected from plots situated on the... -
Reaction of oriental tobacco to spacing and topping treatments at three levels of nitrogenous fertilizer application
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.P. Lamprecht --- , W. J.C. van der Merwe --- ,Three levels of nitrogenous fertilizer were applied to oriental tobacco (Nicotiana tabacum L. cv. Elcatra) at different spacings and topped to 14 and 28 leaves per plant respectively. Yield, income, total nitrogen and total alkaloids of the cured leaves increased,... -
Spatial variability of two selected soil properties in a semi- arid subcatchment of the Lower Great Fish River
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.H. Moolman --- Geography Department,The variability of the soluble salt content and the textural composition of the soil were investigated in a 28-ha sub-catchment of the Ecca River, a tributary of the Great Fish River. The frequency distribution of the soluble salts in the... -
Variations in floristic and palatability composition, yield of veld and of soil characteristics on a paddock scale
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.L. Barnes --- Department of Agriculture and Water Supply (Transvaal Region), Republic of South Africa G.D. Kotzé --- Department of Agriculture and Water Supply (Transvaal Region), Republic of South Africa B.H. Beukes --- Department of Agriculture and Water Supply (Transvaal Region), Republic of South Africa C. Kohlmeyer --- Department of Agriculture and Water Supply (Transvaal Region), Republic of South AfricaFive parallel 900-m line-transects were laid out 100 m apart in relatively homogeneous veld. Floristic composition, yields of dry matter, soil forms and series, effective depth, clay content of the top and subsoil, and the pH of the topsoil were... -
Effects of plant density and row spacing on Lupiniis albus cv. Kiev
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: V.D. Wassermann --- Department of Agriculture, Republic of South AfricaTwo field trials in which the effects of plant density and row spacing on L. albus cv. Kiev were studied, are described. One trial was carried out on dryland and the Other under irrigation. Plant densities ranging from c. 20... -
Characterizing the hydraulic properties of a semi-arid catchment by means of sorptivity measurements and scaling theory
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaThe variability of soil sorptivity within a semi-arid catchment was investigated on a macro- (28 ha) and microscale (16 m2). In the macroscale study, sorptivity was measured at 176 sites using a falling hydraulic head technique. The mean sorptivity of... -
Evaluering en kalibrering van CERES-Maize: 3. Rywydtes in die westelike Hoëveld
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. du Toit --- , Republiek van Suid-Afrika J. Booysen --- Departement Plantkunde, Republiek van Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-AfrikaIn die westelike-Hoëveld waar reënval die mees beperkende hulpbron is, is lae plantpopulasie en wye rye erkende produksiepraktyke vir mielies. Die praktyke verskil beduidend van die praktyke waaronder CERES- Maize ontwikkel is. Ten einde CERES-Maize te evalueer ten opsigte van... -
Boundary layer, stomatal geometry and -spacing, in relation to drought tolerance in four Nicotiana tabacum L. cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L. Van Rensburg --- , Republic of South Africa J. Peacock --- , Republic of South Africa G. H.J. Krüger --- Department of Plant and Soil Sciences, Republic of South AfricaAlthough numerous studies, both phenomenological and mathematical, have related gaseous interchanges at the plant leaf surface and atmospheric interface specifically with regard to drought tolerance, the important role of trichomes and the boundary layer has not been recognized. In this... -
Maize cropping system analysis and economic comparison for two environments
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.A. Prinsloo --- , Republic of South Africa H. J.H. Erasmus --- , Republic of South AfricaThe effect of different maize cropping systems and economic implications were investigated at two localities from 1994 to 2000. Soil types differed, and the topsoil at Bloekomspruit and Viljoenskroon contained 17% and 5% clay, respectively. The five primary cropping systems... -
Calibration and validation of the SWB irrigation scheduling model for soybean [Glycine max. (L.) Merr., indeterminate cv. Wayne]
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.Z. Jovanovic --- Department of Plant Production and Soil Science, South Africa J.G. Annandale --- Department of Plant Production and Soil Science, South Africa A. T.P. Bennie --- Department of Soil Science, South AfricaSoil Water Balance (SWB) is a mechanistic, irrigation scheduling, generic crop model including a database of crop specific growth parameters. The objective of this study was to calibrate and validate this model for soybean [Glycine max. (L.) Merr., indeterminate cv... -
Recognition of natural soil bodies using textural properties of red freely drained soil profiles from KwaZulu-Natal and Mpumalanga
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.P. Turner --- , South Africa M.C. Laker --- Department of Plant Production and Soil Science, South AfricaThe research examines the range of variation of soil texture for red freely drained soils associated with six of the major geological formations of KwaZulu-Natal and Mpumalanga. The soil profile information is derived from particle size analyses of over 4... -
Temporal and spatial relations of plant element uptake and yield of a lucerne stand
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Venter --- Department of Plant Production and Soil Science, South Africa D.J. Beukes --- , South Africa A.S. Claassens --- Department of Plant Production and Soil Science, South Africa M. Van Meirvenne --- Dept. Soil Management and Soil Care, BelgiumIn general, agricultural fields are managed as uniform units, ignoring spatial and temporal relations between plant element uptake and yield. This study was conducted from June 2001 to February 2002 on a two-year-old lucerne stand and explores the spatial relationships... -
The effects of spatial variation of certain soil properties on the winter yield of a lucerne stand
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Venter --- Department of Plant Production and Soil Science, South Africa D.J. Beukes --- , South Africa A.S. Claassens --- Department of Plant Production and Soil Science, South Africa M. Van Meirvenne --- Department Soil Management and Soil Care, BelgiumIn general, agricultural fields are managed as uniform units, ignoring spatial soil heterogeneity and its effects on growth and yield of field crops. This study was conducted from June 2001—February 2002 and examines the effects of spatial variation of soil... -
Regional sustainability in table grape production on saline soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. P. de Clercq --- Department of Soil Science, South Africa M. Van Meirvenne --- Department of Soil Management and Soil Care, BelgiumA study was done in South Africa to investigate the state of the soil salt content and its effect on plant growth on a regional rather than a point basis. The study site went through a development phase since 1996... -
Spatial distribution of selected chemical properties of soils situated close to an abandoned manganese mine
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G. E. Ekosse --- , South Africa P.S. Fouche --- , South AfricaThis study aimed at understanding the spatial distribution of the base saturation percentage (PSB), cation exchange capacity (CEC), pH(water) and electrical conductivity (EC) in soils situated close to the abandoned Kgwakgwe Mn oxide ore mine, Botswana. Four hundred soil samples... -
Spatial variation of soil and plant properties and its effects on the statistical design of a field experiment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Venter --- , South Africa M.F. Smith --- , South Africa D.J. Beukes --- , South Africa A.S. Claassens --- Department of Plant Production and Soil Science, South Africa M. Van Meirvenne --- Dept. Soil Management and Soil Care, BelgiumThe standard procedure in field experimentation is to use a randomized complete block (RCB) design, striving for the most homogeneous conditions as possible among plots in the same block. However, geostatistical concepts dictate that a spatial dependence exists for observations... -
Variable spatial structure of schooling pelagic fish off Namibia: implications for acoustic surveys
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. C. Coetzee O. A. Misund G. OechslinSchools of horse mackerel Trachurus trachurus capensis, sardine Sardinops sagax and round herring Etrumeus whiteheadi were surveyed by conventional echo-integration along systematic transects. The transects were surveyed twice, in opposite directions. Clupeoid biomass was concentrated in a few dense aggregations,... -
Direct hydroacoustic observations of chokka squid Loligo vulgaris reynaudii spawning activity in deep water
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: M. J. Roberts M. Barange M. R. Lipiński M. R. ProwseUnusual and distinct hydroacoustic targets were observed in November 1996, May 1998 and November 1998 during routine pelagic biomass surveys off the south coast of South Africa. During the November 1996 survey, seven such targets were observed near the bottom... -
Movement patterns of red steenbras Petrus rupestris tagged and released in the Tsitsikamma National Park, South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: S. L. BrouwerMovement patterns of red steenbras Petrus rupestris were obtained from fish tagged and released in the Tsitsikamma National Park, South Africa. Of 217 fish tagged, 38 were recaptured. Juveniles (<700 mm FL) were resident, whereas adults (>700 mm FL) migrated... -
Life history of white stumpnose Rhabdosargus globiceps (Pisces: Sparidae) off South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: M. H. Griffiths C. Wilke A. J. Penney Y. MeloFishery-dependent and fishery-independent distribution analyses together reveal four discrete areas of white stumpnose Rhabdosargus globiceps abundance between Port Nolloth and the Kei River off the Cape Province of South Africa: the Western Cape (Saldanha Bay), the South-Western Cape, the Southern... -
The influence of site, season and day of the week on exploitation of rocky intertidal biota in central Transkei, South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: V. N. Majiza T. A. LasiakTemporal and spatial variations in the pattern and intensity of exploitative use of rocky shores in the densely populated central Transkei region of the south-east coast of South Africa are described. Surveys of intertidal exploiters and their catches were conducted... -
Aspects of the population biology of Octopus vulgaris in False Bay, South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: C. D. Smith C. L. GriffithsThe population biology of the octopus Octopus vulgaris was studied from specimens collected by SCUBA in False Bay, South Africa, between 1997 and 1998. In all, 83% of the specimens collected were found in shelter. Small octopuses were more active... -
ASPECTS OF THE BIOLOGY OF TILAPIA RENDALLI IN THE DOORNDRAAI DAM TRANSVAAL
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G.R. Batchelor --- Division of Nature Conservation, South AfricaScale studies indicated that the annulus is a reliable year mark. A linear relationship existed between scale radius and body growth enabling back calculations to be made. The growth rate of males in Doorndraai Dam were similar to findings in... -
OBSERVATIONS ON THE THREE ALLOPATRIC POPULATIONS OF THE MALUTI MINNOW,
OREODAIMON QUATHLAMBAE (BARNARD) WITH NOTES ON ITS EVOLUTION, ECOLOGY, SPAWNING, AND CONSERVATIONItem type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: S.R. Gephard --- , LesothoMeristics and pigmentation of specimens of Oreodaimon quathlambae from the three known populations were compared to determine whether the species has experienced divergent evolution. Pigmentation was found to vary substantially but meristics counts did not. A proposal is made-to recognise... -
VIABLE HETEROTROPHIC BACTERIAL POPULATION STRUCTURE OF A TURBID MAN-MADE IMPOUNDMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.F. Toerien --- , Republic of South Africa D.N. Sadie --- , Republic of South Africa H. J.J. van Vuuren --- Department of Microbiology, Republic of South Africa R.P. Tracey --- Department of Microbiology, Republic of South AfricaSeventy one heterotrophic bacterial isolates were obtained from Wuras Dam, phenotypically characterized and clustered with the unweighted-pair group method. Three groups were obtained of which the first contained 59 members in several clusters. Overall this group was characterized by a... -
WATER TRANSPARENCY CHARACTERISTICS OF SOUTH AFRICAN IMPOUNDMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , South Africa C.A. Bruwer --- , South AfricaSome water transparency characteristics (Secchi disc transparency, mean diffuse light attenuation coefficient and turbidity) of a number of South African impoundments are compared. In general most impoundments may be considered to be highly turbid; for 92 impoundments considered in this... -
BREEDING BEHAVIOUR OF THE MPASA, OPSARIDIUM MICROLEPIS (GUNTHER) (PISCES:CYPRINIDAE), IN LAKE MALAWI
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D. Tweddle --- Fisheries Department, MalawiObservations on the breeding behaviour of mpasa, a commercially valuable cyprinid endemic to Lake Malawi, were conducted in the Bua and North Rukuru Rivers. The spawning run takes place over an extended period during and after the rains, with an... -
AN ASSESSMENT OF THE GROWTH RATE OF MPASA, OPSABIDIUM MICROLEPIS (GUNTHER, 1864) (PISCES: CRYPRINIDAE), BY LENGTH FREQUENCY ANALYSIS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D. Tweddle --- Fisheries Department, MalawiThe mpasa, Opsaridium microlepis, is an important commercial species in areas of Lake Malawi near major inflowing rivers during annual spawning migrations. Plots of length frequency data collected over a series of years from mpasa catches in the Bua and... -
SOME POPULATION CHARACTERISTICS OF THE BIVALVES OF THE PONGOLO RIVER FLOODPLAIN
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: C.C. Appleton --- Department of Zoology and Entomology, South Africa P. la Hausse de Lalouvieret --- , South AfricaEstimates of the density, structure and standing crop of populations of the freshwater bivalve molluscs Caelatura framesi, Aspatharia wahlbergi and Corbicula africana on the Pongolo River floodplain were made from the samples of shells stranded in the mud of several... -
INDUCED SPAWNING OF MOGGEL, LABEO UMBRATUS (SMITH) (PISCES: CYPRINIDAE)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: A.H. Bok --- Cape Department of Nature and Environmental Conservation, South AfricaRipe female Labeo umbratus, captured in Lake Mentz on the Sundays River, were artificially spawned following a series of injections with human chorionic gonadotrophin and homogenized L. umbratue pituitaries. The eggs were stripped and fertiUzed with milt from untreated male... -
FLUX OF INORGANIC NUTRIENTS AND PARTICULATE CARBON BETWEEN A SPARTINA MARITIMA SALT MARSH AND THE SWARTKOPS ESTUARY, EASTERN CAPE
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D. Baird --- Department of Zoology, South Africa P. E.D. Winter --- Department of Zoology, South AfricaThe flux of dissolved inorganic nutrients (NH4-N, NO2-N, NO3-N, SRP) and suspended particulates (particulate organic carbon POC, and particulate inorganic carbon PIC) was measured across the mouth of a small creek draining a portion of the intertidal Spartina salt marsh... -
IMPLICATIONS OF WATER RELEASE FROM THE PONGOLAPOORT DAM FOR THE FISH AND FISHERY OF THE PHONGOLO FLOODPLAIN, ZULULAND
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: G.S. Merron --- , South Africa M.N. Bruton --- , South Africa P. la Hausse de Lalouviere --- , South AfricaWetland fish stocks can usually be sustained as long as the natural flood regime is maintained, but unnatural disruption of the flooding pattern can interfere with fish spawning and feeding. The dynamics of the Phongolo floodplain fish community are determined... -
Patch grazing of Tall Grassveld by cattle after a spring burn
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: CD MorrisPatterns of herbage removal by rotationally stocked cattle (at a density of 4.85AUE ha-1) on initially structurally homogenous Tall Grassveld were examined over a single season. Three unreplicated camps were stocked early (29 days), at the recommended '10-15cm' sward height... -
The Ellis paradigm — humans, herbivores and rangeland systems
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Michael CoughenourThe scientific and conceptual contributions Jim Ellis made throughout the course of his career reveal a logical progression towards increased understanding of pastoral ecosystems worldwide. Research in wildlife, large herbivores, systems ecology and energy flows through grazing ecosystems formed the... -
Plant invaders, global change and landscape restoration
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: DA Pyke ST KnickModifications in land uses, technology, transportation and biogeochemical cycles currently influence the spread of organisms by reducing the barriers that once restricted their movements. We provide an overview of the spatial and temporal extent for agents of environmental change (land... -
Changes to the vegetation of the mid‐Fish River valley, Eastern Cape, South Africa, in response to land‐use, as revealed by a direct gradient analysis
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: N.V. Evans --- Department of Botany, Republic of South Africa A.M. Avis --- Department of Botany, Republic of South Africa A.R. Palmer --- , Republic of South AfricaDegradation of natural rangeland is a serious problem throughout southern Africa. It has been suggested that incorrect grazing management practices have resulted in a decrease in the production potential of rangelands. In order to explore the nature and extent of... -
Growth modelling of Pinus roxburghii in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E.R. Falkenhagen --- , South AfricaThe growth in diameter at breast height, height and tree volume and plot density were studied in an unreplicated spacing trial of Pinus roxburghii at Weza, South Africa. -
Relations of Power in Different Spaces: An Exploration of the Schooling Experiences of Children in an HIV/AIDS Context
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Anitha Ramsuran --- University of KwaZulu-Natal, Fikile Lurwengu --- University of KwaZulu-Natal,In this article we explore how the concept of relations of power in different spaces plays out in the lives of school children living in an HIV/AIDS context, and how processes of inclusion and exclusion are associated with particular spaces... -
Facilitation of Spatial Orientation Among Adolescents from a Disadvantaged Background
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Chris Myburgh --- University of Johannesburg, Marie Poggenpoel --- University of Johannesburg, Glen van der Westhuizen --- University of Johannesburg,The study investigated structural and shape recognition in two to three dimensions by adolescents from a historically disadvantaged neighbourhood. Data on the spatial orientation of grade eight learners in a specific school were collected using specifically adjusted and developed tests... -
On two epireflective subcategories of the category of 2T 0-fuzzy bitopological spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: AnuruddhaS. Khastgir ArunK. SrivastavaThe motivation for the present work is provided by Giuli and Salbany's work on the category BTOP 0 of T 0?bitopological spaces wherein they identified a cogenerator Q and a closure operator and used these to obtain, among other things,... -
Compactness in fuzzy function spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gunther JägerIn [3] we defined a notion of compactness in FCS, the category of fuzzy convergence spaces as defined by Lowen/Lowen/Wuyts [8]. In their paper the latter also introduced a fuzzy convergence structure c-lim for fuzzy function spaces thus proving that... -
Two 1935 questions of Mazur about polynomials in Banach spaces: counter-examples
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Vladimir PestovWe give various constructions of which the most significant is a continuous scalar-valued 2-polynomial W on the separable Hilbert space l 2 and an unbounded set R ⊂ l 2 such that (i) W is bounded on an ε-neighbourhood of... -
AL- and AM-spaces of integrable scalar functions with respect to a Fréchet-valued measure
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Antonio Fernández Francisco NaranjoWe study the question of determining conditions for the space of R-valued integrable functions with respect to a vector measure taking its values in a real Fréchet space to be an AL- or an AM-space. -
Operators not positive with respect to any basis
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Angela SpalsburyIn this paper we use an equivalent form of Titchmarsh's Convolution theorem to show that the Volterra operator is an example of a quasi-nilpotent operator on a Hilbert space that is not positive with respect to any basis of L... -
Banach Spaces with Complete Continuity Properties
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Narcisse RandrianantoaninaLet X be a Banach space, (Ω, Σ, λ) be a finite measure space and G be a compact metrizable group. We discuss the complete continuity properties related to subsets of the dual group G for Bochner spaces. It is... -
DW Complexes and Their Underlying Topological Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Patrice NtumbaThe naive concept of a DW complex is that of a differential space that can be built up from cells and whose differential structure is defined in terms of differential structures on Euclidean unit closed balls. This concept stems from... -
The Metric Theory of Tensor Products (Grothendieck's Résumé Revisited) Part 4: The Role of C (K)-spaces and L1-spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Joe Diestel Jan Fourie Johan SwartIn this continuation of our multiseries on Grothendieck's 'Résumé', we look at the special place of C(K)-spaces and L 1-spaces in the general metric theory of tensor products. -
A Characterization of the Prime Closed Filter Compactification of a Topological Space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: H.L. Bentley H. HerrlichThe prime compactification whose points are the prime closed filters can be defined for a general topological space and is naturally functorial. We derive several properties of this compactification and present a characterization. -
Striking differences between ZF and ZF+weak choice in view of metric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Horst Herrlich Kyriakos Keremedis Eleftherios TachtsisWell-known properties held by metric spaces with the countable chain condition (ccc) such as separability, second countability, Lindelöf, paracompactness may fail in the absence of the axiom of choice AC. In the long catalogue of weak choice principles, see [10],... -
Multivalued linear projections
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: R.W. Cross D.L. WilcoxA multivalued linear projection operator P defined on linear space X is a multivalued linear operator which is idempotent and has invariant domain. We show that a multivalued projection can be characterised in terms of a pair of subspaces and... -
Some Extremal Properties of Section Spaces of Banach Bundles and Their Duals, II
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Terje Hoim D.A.. RobbinsLet π : E → X be a real Banach bundle with section space Γ(π), where X is a compact Hausdorff space. We complete the characterization of weak-* and sequential weak-* points of continuity in the unit ball of Γ(π)... -
The Dual Space of an Asymmetric Normed Linear Space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: L.M. García-Raffi Romaguera Sanchez-PérezGiven an asymmetric normed linear space (X, q), we construct and study its dual space (X ∗ , q ∗). In particular, we show that (X ∗ , q ∗) is a biBanach semilinear space and prove that (X, q)... -
On the Unboundedness of Control Operators for Bilinear Systems
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Abdelali IdrissiThe aim of this work is to study the classes of unbounded linear control operators which ensure the existence and uniqueness of the mild and strong solutions of certain bilinear control systems. By an abstract approach, similar to that adopted... -
Completion of Probabilistic Uniform Limit Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Harald NusserIn this article completions of special probabilistic semiuniform convergence spaces are considered. It turns out that every probabilitic Cauchy space under a given t-norm T (triangular norm) has a completion which, in the special case of probabilistic Cauchy spaces with... -
Geometric Fuzzification
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: G. Lubczonok C.C. RemsingWe define the concept of fuzzy subobject of a "good" object in an arbitrary concrete category. The approach, called geometric fuzzification, is based upon an appropriate concept of fuzzy point. These fuzzy points are defined on metric spaces which allow... -
Strong Versus Uniform Continuity: A Constructive Round
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Peter Schuster Vîţă Douglas BridgesThe notion of apartness has recently shown promise as a means of lifting constructive topology from the restrictive context of metric spaces to more general settings. Extending the point-subset apartness axiomatised beforehand, we characterise the constructive meaning of 'two subsets... -
Good Projections of Spaces of Vector Measures onto Subspaces of Bochner Integrable Functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Giovanni EmmanueleWe show that the complementability of L 1 (μ, X) in cabv (μ, X) implies the complementability of L 1 (μ, K(Z, X)) in cabv (μ, K(Z, X)), provided the projection from cabv (μ, X) onto L 1 (μ, X)... -
Some Criteria For Determining When A Walsh Series is a Walsh-Fourier Series
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: John Alexopoulos EmilyH. SpragueWe show that a general Walsh series is the Walsh-Fourier series of a function fεLp [0, 1] for 1 ≤ p < ∞ if and only if its sequence of partial sums contains a relatively weakly compact subsequence. Several other... -
On Carleson Embeddings Of Star-invariant Supspaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: JosephA. Cima AlecL. MathesonEmbeddings of star-invariant subspaces K p θ of H p determined by an inner function θ are studied. Using a method of Aleksandrov, it is shown that the embedding into L p (μ) is compact whenever μ satisfies a certain... -
Lattice Properties of Operators Defined By Random Measures
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: J.J. Grobler B. de Pagter D.T. RambaneWe prove that the lattice properties of operators defined by random measures hold under general conditions on the measure space. This solves a problem found in a paper of A.R. Sourour on these operators and generalizes his results. -
On the Cardinality of Smallest Spanning Sets of Rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Nadia Boudi Lorenz HalbeisenLet R = (R, +, ˙) be a ring. Then Z ⊆ R is called spanning if the R-module generated by Z is equal to the ring R. A spanning set Z ⊆ R is called smallest if there is... -
Lyapunov Convexity Type Theorems For Non-Atomic Vector Measures
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E. Saab P. SaabGiven a Banach space X, we consider the problem of when the range of a non-atomic, and σ-additive X-valued measure has a convex closure. We give a survey of Lyapunov convexity type theorems pertaining to this problem. We also give... -
A Non-topologically Generated Hutton-lowen Uniformizable Space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Sanjiang Li Dexue ZhangIn this note, it is shown that there exist non-topologically generated spaces which are both Lowen uniformizable and Hutton uniformizable. On the other hand, the FNS-coreflection of the Hutton unit interval I(I) is neither Lowen uniformizable nor Hutton uniformizable. -
Derivations on ρ-banach Algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Amir KhosraviLet A be a ρ-Banach algebra with radical R and let D be a derivation on A. We generalize Johnson's theorem, Sinclair's theorem and Thomas's theorem (Singer-Wermer's conjecture) to ρ-Banach algebras. If K = {x ∈ R: for every n... -
Some Banach Space Characterizations Of The δ2 Condition
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: J. Alexopoulos D. Barcenas EchandiaIn [1] J. Alexopoulos has shown that if Φ ∈ δ2 and if its complement ψ satisfies limt ψ∞ψ(ct) ψ(t) = ∞ for some c > 0 then a bounded set K ⊂ L Φ is relatively weakly compact if... -
Cb (X) Revisited: Induced Map And Submetrizability
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: S. KunduThis paper, in the first half, studies the induced map on the space C b(X) of all continuous real-valued functions on a Tychonoff spaceX, where the function space has the bounded-open topology. In the second half, the submetrizability of C... -
Multipliers of Hardy Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Beth OsikiewiczWe summarize the results on multipliers from H p to l q for various p and q. In some instances we provide proofs which are different from the ones in the literature. On other occasions we are able to improve... -
On Closure Operators, the Reals, and Choice
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Eraldo Giuli Horst HerrlichThe behaviour and the relationships between various closure operators are investigated for subspaces of the reals in the setting of ZF, i. e., Zermelo-Fraenkel set theory without the axiom of choice. Typical results: Equivalent are: 1. Every subspace... -
Separation of Convex Sets and Best Approximation in Spaces with Asymmetric Norm
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: S. CobzaşThe aim of the present paper is to show that some results in Banach spaces have their analogs in spaces with asymmetric seminorms. A space with asymmetric seminorm is a pair (X, p),where X is a real vector space and... -
Characterizing the one-sided tensor norms Δ P and T Δ P
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: C.C.A. Labuschagne. The Bochner norms Δ p for 1< p < ∞ on the vector valued L p -spaces are examples of reasonable cross norms which are not tensor norms. Using the order structure of L p (μ), a... -
Mapping spaces and homotopy theory
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: PeterI. BoothLet q : Y → B be a map (= continuous function) and Z be a space. We will use Y ! Z to denote a set of partial maps from Y to Z, i.e.those such maps whose domains are... -
Stratified L-uniform convergence spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: G. Jäger M.H. BurtonWe define a supercategory of the category of stratified L-uniform spaces, where L is a complete Heyting algebra. Our category is topological over SET and cartesian closed. In the case where L is the two-point chain, it coincides with the... -
Stability of asymptotic properties of Hille-yosida operators under perturbations and retarded differential equations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Lahcen ManiarWe give conditions on the strongly continuous semigroup (T 0(t)) t≥0, generated by the part of a Hille-Yosida operator A on X 0 := D(A), and a non-autonomous family of operators (B(t)) t≥0 such that the evolution family (U(t,s)) t≥s≥0,... -
On the way to Frölicher Lie groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: P.P. Ntumba T.A. BatubengeIn this paper, we start by showing that one can obtain by way of diffeomorphisms some classical smooth curves and surfaces. The notion of bundles is also introduced in the category of Frölicher spaces, and one may carry on investigating... -
Boman's theorem: Strengthened and applied
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: H. L. Bentley Paul CherenackA 1-variable calculus type argument is used to show that, for a function f : R 2 → R, if for all (a, b) ∈ R 2 we have that f o c is smooth for every smooth curve c... -
Norm Estimates for Operators T : Hp → lq Involving lr (ls ) Norms
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Beth OsikiewiczNorm estimates for bounded linear operators T : Hp → lq are derived in terms of the vector-valued norms of their matrix entries. Explanations are also provided to show that all of the upper estimates for ‖T‖ are sharp with... -
The Coarsest Hausdorff Lebesgue Topology
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jurie ConradieIf a Riesz space E contains an order dense Riesz subspace which admits a Hausdorff Lebesgue (i.e. order continuous) topology, then there is a coarsest Hausdorff Lebesgue topology on E. This topology extends uniquely to a Hausdorff Lebesgue topology on... -
On classes of maps with the extension property to the bicompletion in quasi-pseudo metric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: SeithutiP. MoshokoaExtensions of CS-regular maps from a dense subset of a metric space to the whole space are discussed in the literature. It is the purpose of this paper to present results on extensions of these maps to the bicompletion in... -
Compact perturbations and norm attaining operators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Janice KoverIn 1963, Lindenstrauss showed that for a reflexive space, X, and any Banach space,Y, that the norm attaining operators in L(X, Y) are dense. Recall that a linear operator A is norm attaining if there exists a unit vector x... -
Function spaces and d-separability
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: VladimirV. TkachukThe object of this paper is to study when a function space is d-separable, i.e., has a dense σ-discrete subspace. Several sufficient conditions are obtained for C p(X) to be d-separable; as an application it is proved that C p(X)... -
Order convergence structure on C(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Roumen Anguelov Jan Harm van der WaltThis paper brings together three concepts which have not been related so far, namely, the concept of order convergence, the concept of convergence space and the concept of Hausdorff continuous functions. The order convergence on a poset P, which is... -
A new compactness type topological property
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dongsheng ZhaoBy a gauge on a topological space we shall mean a mapping that assigns each element in the space an open neighbourhood. We investigate some topological properties which can be characterized using gauges. The main property we will consider is... -
Sobolev spaces on graphs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: M.I. OstrovskiiThe present paper is devoted to discrete analogues of Sobolev spaces of smooth functions. The discrete analogues that we consider are spaces of functions on vertex sets of graphs. Such spaces have applications in Graph Theory, Metric Geometry and Convex... -
The canonical spectral measure and köothe function spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jos´e Bonet Susumu Okada WernerJ. RickerThe theme of this paper is the interaction between analytic properties of (Fréchet) Köthe function spaces X and measure/operator theoretic properties of the canonical spectral measure Q acting in X. For instance, Q is boundedly σ-additive iff X is Montel... -
The Borsuk-Ulam theorem for surfaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: DacibergL. GonçalvesGiven a pair (S, T) whereS is a closed surface and T is a free Z 2 action on S, we classify which pairs have the property that the Borsuk-Ulam theorem holds with respect to R 2. In particular if... -
Topologies on uniform hyperspaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gavin HitchcockThis paper includes the proofs of results announced in [3], as well as other results deriving from the Isbell-Smith-Ward problem of comparability of Hausdorff uniform topologies on hyperspaces of uniform spaces. In particular we give (in Theorem 6) simple conditions... -
Annihilating probability measures under constraints
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Bernhard BurgstallerLet P be a probability measure and H ⊆ L ∞(P) be a linear subspace and 0 < c ≤ 1 ≤ C real constants. Then we give a relatively computable criterion whether or not there exists a H-annihilating probability... -
Categories of Dicompact bi-T 2 texture spaces and a Banach-Stone theorem
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Filiz Yildiz LawrenceM. BrownThe principal aim of this paper is to consider various aspects of the theory of dicompact bi-T 2 texture spaces, and place them in a categorical setting. It culminates in a version of the Banach-Stone theorem. On the way, a... -
Boundedly UC spaces: characterisations and preservation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Tanvi Jain S. KunduA metric space (X, d) is called a boundedly UC space if every closed and bounded subset of X is a UC space. A metric space (X, d) is called a UC space if each real-valued continuous function on (X,... -
A vector lattice version of r˚ adström's embedding theorem
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: C.C.A. Labuschagne A.L. Pinchuck C.J. van AltenR˚ adström's embedding theorem for 'near vector spaces', which are essentially vector spaces without additive inverses, is extended to embeddings of 'near vector lattices', which are essentially vector lattices without additive inverses, into vector lattices. -
Approach structures and measures of connectedness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: David Holgate Mark SioenMeasures of connectedness versus disconnectedness are introduced in anarbitrary topological construct as fixed points of a Galois connection. This places measures of connectedness found in the literature in a general categorical frame-work. -
On the maximal ideal space of extended analytic lipschitz algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: TaherG. Honary Sirous MoradiLet X be a compact, plane set and let K be a compact subset of X. We introduce new classes of Lipschitz algebras Lip(X, K, α), lip(X, K, α), consisting of those continuous functions f on X such that f|K... -
On the Epireflective Hull of Topological Nearness Groups in the Category of Nearness Groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: LamarH. Bentley VijayaL. GompaTo find the specific nature of the objects that are in the epireflective hull of the symmetric topological spaces in the category of nearness spaces is a long open problem. See [BCH05] for more information. Here we consider topological nearness... -
Isomorphisms into section spaces of Banach bundles
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Terje Hõim D.A. RobbinsLet X be a compact Hausdorff space, E a (real) Banach space, and let C(X, E) be the space of continuous functions from X to E. The monograph of Cembranos and Mendoza provides a primer on when C (X, E)... -
Bi-Alexandroff spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Phethiwe MatutuBi-Alexandroff spaces are defined as extensions of Alexandroff spaces. Urysohn's lemma for bi-Alexandroff spaces is used to show that upper and lower cozero sets of bitopological spaces are bi-Alexandroff spaces. An adjunction between bi-Alexandroff spaces and pairwise completely regular bitopological... -
Perturbations by norm attaining operators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Janice KoverIn this note, we develop a connection between Fredholm operators and norm attaining operators in the set L(H) of bounded linear operators on a Hilbert space. We use this connection to extend an earlier result about the stability of norm... -
On tangent cones of Frölicher spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: B. Dugmore P.P. NtumbaTangent spaces, tangent cones, invertible pairs, and various other notions common to differential geometry are defined for Frölicher spaces in a natural way and seen to coincide with their counterparts for smooth finite dimensional manifolds. The geometry of the wedge... -
On completeness in symmetric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: SeithutiP. MoshokoaIn the literature completeness for symmetric spaces is done through the classical Cauchy criterion for metric spaces. However, unlike the situation in metric spaces a convergent sequence in a symmetric space is not necessarily a Cauchy sequence. In the paper... -
On the Mappings Preserving Equality of 2-Distance
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Wei-Jia Jia* --- School of Mathematics Science, P.R. ChinaIn this paper, we consider 2-isometries, 2-continuous mappings and mappings preserving equality of 2-distance and investigate the relation between the three mappings in linear 2-normed spaces. We prove that if f: E → F is a mapping preserving equality of... -
Lattice-Valued Cauchy Spaces and Completion
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gunther Jäger --- Department of Statistics, South AfricaWe define lattice-valued Cauchy spaces. The category of these spaces is topological over SET and cartesian closed. Special examples are lattice-valued uniform convergence spaces and probabilistic Cauchy spaces. We further define completeness and give a completion for these spaces which... -
SYNTOPOFORMIC SPACES (SYNTOPOGENOUS LIMIT SPACES)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dieter Leseberg --- , Federal Republic of GermanyCsászár generalized the uniform spaces, the proximity spaces and the topological spaces to syntopogenous spaces. Cook and Fischer generalized the uniform spaces to uniform limit spaces. Finally Marny generalized the proximity spaces to proximal limit spaces. Analogously we generalize the... -
TOPOLOGICAL DECOMPOSITIONS OF THE DUALS OF LOCALLY CONVEX VECTOR SEQUENCE SPACES
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: JanH Fourie --- Depart. of Mathematics Potchefstroom, South Africa WilliamH Ruckle --- Depart. of Mathematical Sciences, United States of AmericaLet Λ be a scalar sequence space which is endowed with a normal locally convex topology. For a separated locally convex space E we denote by Λ(E) the vector space of all sequences g in E for which (>g(i),a<) ε... -
IS THE CONSTRUCT OF L-TOPOLOGICAL SPACES A CO-TOWER EXTENSION OF SOME SIMPLER CONSTRUCT?
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Horst Herrlich --- Fachbereich 3, Mathematik, University of Bremen, Bremen, Germany, Dexue Zhang --- Department of Mathematics, Sichuan University, Chengdu, China,In an earlier paper, the second author associated with any fibre-small topological construct A and any completely distributive lattice L, an extension of A, called the (L-)-co-tower extension of A. He demonstrated that many familiar constructs in fuzzy topology can... -
BOUNDED SUBSETS AND WEAK REALCOMPACTNESS CONDITIONS
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: S. Kundu --- Department Of Mathematics, Indian Institute of Technology, Delhi, New Delhi, India, A. B. Raha --- Stat-Math Division, Indian Statistical Institute, Calcutta, India, M. A. Swardson --- Department of Mathematics, Ohio University, Athens, Ohio, USA,A subset A of X is bounded if every continuous real-valued function on X is bounded on A. A completely regular Hausdorff space X is said to have the bz-property if every bounded subset of X is contained in a... -
UG-Differentiability Entails Hahn-Banach
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Marianne Morillon --- ERMIT, Département de Mathématiques et Informatique, FranceDenoting by ACN the countable axiom of choice, we show in ZF+AC N that the dual ball of a uniformly Gâteaux-differentiable normed space is compact in the weak* topology.In ZF, we prove that this dual ball is (closely) convex-compact in... -
Almost Perfectly Continuous Functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: D. Singh --- Department of Mathematics, IndiaThe aim of the present paper is to continue the study of almost perfectly continuous (≡ regular set connected) functions initiated by Dontchev, Ganster and Reilly. It turns out that in general the notion of almost perfectly continuity is independent... -
An Algebraic Characterization of Blumberg Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: M.R. Ahmadi Zand --- Department of Mathematics, IranLet X be a topological space and let C(X) be the ring of continuous real-valued functions on X. We study T′(X) as an over-ring of C(X), where T′(X) denotes the set of all real-valued functions on X such that for... -
On the Projective Curvature Tensor of Generalized Sasakian-Space-Forms
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: U.C. De --- Department of Pure Mathematics, India Avijit Sarkar --- Department of Mathematics, IndiaThe object of the present paper is to study the nature of generalized Sasakian-space-forms under some conditions regarding projective curvature tensor. All the results obtained in this paper are in the form of necessary and sufficient conditions. -
Vector integration
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E.G.F. Thomas --- Johann Bernoulli Institute for Mathematics and Computer Science, The NetherlandsThis paper deals with the theory of integration of scalar functions with respect to a measure with values in a, not necessarily locally convex, topological vector space. It focuses on the extension of such integrals from bounded measurable functions to... -
Banach-Stone-like theorems for lattices of uniformly continuous functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: M. Hušek --- , A. Pulgarín --- Avda. Universidad s/n, SpainNew couples of uniform spaces X, Y are found out for which a lattice isomorphism between U(X) and U(Y) implies a uniform homeomorphism between X and Y. -
Schur spaces and weighted spaces of type H ∞
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Alejandro Miralles --- Instituto Universitario de Matemáticas y Aplicaciones de Castelló (IMAC), Departamento de Matemáticas, SpainWe extend some results related to composition operators on H υ(G) to arbitrary linear operators on H υ0(G) and H υ(G). We also give examples of rank-one operators on H υ(G) which cannot be approximated by composition operators. -
Generalized spacelike Bertrand curves in Minkowski 5-space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Soley Ersoy --- Department of Mathematics, Faculty of Arts and Sciences, Turkey Abdullah Inalcik --- Department of Mathematics, Faculty of Arts and Sciences, TurkeyIn this paper, we give the definition of the generalization of spacelike Bertrand curves and obtain the characterization of these curves in Minkowski 5-space . Moreover, we define three types special spacelike Bertrand curves in Minkowski 5-space -
Bounded proximities and related nearness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dieter Leseberg --- Department of Mathematics and Informatics, GermanyThe new created concept Bounded Topology, a convenient foundation for topology, (see [9]) deals with a lot kind of structures examined by topologists in the past: Especially, generalized convergence spaces, now defined as b-convergences in [8], appear in a new... -
Superposition operators between weighted spaces of analytic functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Christopher Boyd --- School of Mathematical Sciences, Ireland Pilar Rueda --- Departamento de Análisis Matemático, Facultad de Matemáticas, SpainWe study the existence and the continuity of superposition operators between weighted spaces of holomorphic functions in terms of the weights. -
On topological spaces whose topology is induced by a binary relation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E. Induráin --- Departamento de Matemáticas, Spain V. Knoblauch --- Department of Economics, U.S.A.We study the problem of characterizing which topologies on a nonempty set are generated by a binary relation by means of its lower and upper contour sets. In this direction we consider different classical categories of topological spaces whose topology... -
The Riesz convergence property on weighted Lorentz spaces and Orlicz-Lorentz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Hongliang Li --- Department of Mathematics, P.R.ChinaIn this paper, we define new Orlicz-Lorentz spaces . We find the necessary condition and sufficient condition for quasi-normed weighted Lorentz spaces to have Riesz convergence property. Also, we find the similar result for quasi-normed Orlicz-Lorentz... -
Hilbert-type inequalities for Hilbert space operators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mario Krnić --- Faculty of Electrical Engineering and Computing, CroatiaIn this paper we establish a general form of the Hilbert inequality for positive invertible operators on a Hilbert space. Special emphasis is given to such inequalities with homogeneous kernels. In some general cases the best possible constant factors are... -
The class of b-AM-compact operators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Belmesnaoui Aqzzouz --- Juridiques et Sociales, Département d'Economie, Morocco Jawad H'Michane --- Département de Mathématiques, MoroccoWe introduce and study a new class of operators that we call b-AM compact operators, and we establish necessary and sufficient conditions on the duality property for this class of operators. As interesting consequences, we obtain some characterizations of discrete... -
Evidence of AIDS mortality from an alternative source: A Swaziland case study
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Alan Whiteside --- Health Economics and HIV/AIDS Research Division, South Africa Chris Desmond --- Health Economics and HIV/AIDS Research Division, South Africa John King --- , Swaziland Jane Tomlinson --- , Swaziland Conway Sithungo --- , SwazilandThis paper explores a way of measuring AIDS mortality in the absence of vital registration. It looks at the death notices in the major daily newspaper in Swaziland, The Times of Swaziland, and asks if these can be analysed to... -
Media ownership and news framing: an analysis of HIV/AIDS coverage by Ugandan press
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: James Kiwanuka-Tondo --- Department of Communication, United States KellyF Albada --- Department of Communication, United States Fay Cobb Payton --- Department of Communication, United StatesApplying framing theory, the present research analyzes trends in Ugandan news coverage and the prominent issue frames for HIV/AIDS-related stories. In order to determine the influence of other factors, such as media ownership and journalist origin, nearly 800 articles, from... -
Beacons in the limnological landscape
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR AllansonAn overview is given of a number of major developments in the limnology of South Africa, Zimbabwe and Namibia. None was possible without the involvement of enthusiastic investigators who, over some 70 years, stimulated the growth of freshwater research in... -
Land use and cover changes in the Likangala catchment of the Lake Chilwa basin, Malawi: implications for managing a tropical wetland
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DM Jamu JB Chimphamba RE BrummettThis study analyses land use and cover changes in the Likangala River catchment of Lake Chilwa, Malawi, an endorheic tropical African lake. It also examines how land use-related physico-chemical and hydrological parameters in two affluent rivers of the lake affect... -
A preliminary assessment of the impact of alien rainbow trout (Oncorhynchus mykiss) on indigenous fishes of the upper Berg River, Western Cape Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DJ Woodford ND ImpsonImpacts of alien rainbow trout (Oncorhynchus mykiss) on critically endangered Berg River redfin (Pseudobarbus burgi), Cape kurper (Sandelia capensis) and Cape galaxias (Galaxias zebratus) in the upper Berg River were investigated in terms of predation and spatial interactions. Trout stomach... -
Spatial variability in macroinvertebrate assemblages: comparing regional and multivariate approaches for classifying reference sites in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HelenF DallasSpatial variability in macroinvertebrate assemblages was examined with the aim of evaluating the utility of regional classification systems in aquatic bioassessment. Sampling was undertaken at reference sites in the Western Cape and Mpumalanga, South Africa, using the rapid bioassessment method... -
A histological description of ovarian recrudescence in two Labeo victorianus populations
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Justus Rutaisire AnthonyJ BoothThe ovaries of Labeo victorianus are paired organs situated in the peritoneal cavity and suspended on either side of the midline by a mesovarium. A capsule, composed of dense, regularly-arranged collagen and elastic fibres mixed with a few smooth muscle... -
The biology of Barbus mattozi Guimaraes (Teleostei: Cyprinidae) in a Zimbabwean reservoir 4: Reproduction
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BG Donnelly BE MarshallSpawning of Barbus mattozi in the Mtsheleli Dam, Zimbabwe, is highly seasonal and timed to take place with the first floods. In December 1974, the Mtsheleli River flooded after heavy rain and the entire adult population of B. mattozi migrated... -
Fish migrations in two seasonal streams in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Brian Gratwicke BrianE MarshallFish migrations into the streams of seasonally-flooded depressions (or dambos) that cover the central plateaus of Africa are a well-known phenomenon to scientists and lay people alike. However, the factors causing seasonal migrations are poorly understood and most scientific references... -
Management advice for the Diplotaxodon limnothrissa (Teleostei: Cichlidae) resource in the south-east arm of Lake Malawi, based on per-recruit analysis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GeoffreyZ Kanyerere AnthonyJ Booth OlafLF WeylDiplotaxodon limnothrissa is a widely distributed species occurring throughout Lake Malawi and is probably the most abundant cichlid in the pelagic zone of the lake. The species is exploited commercially in the south-east arm of the lake, but since the... -
Benthic macrofauna community composition, abundance and distribution in the Tanzanian and Ugandan inshore and offshore waters of Lake Victoria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GW Ngupula --- , Tanzania R Kayanda --- , TanzaniaBenthic macroinvertebrate community composition was investigated in 2008 at 55 stations at various depths in the nearshore and offshore waters of Lake Victoria, in relation to dissolved oxygen, pH, temperature, chlorophyll a and conductivity. Macroinvertebrate abundance was higher in the... -
Distribution, abundance and diversity of macrozoobenthos in Aiba Reservoir, Iwo, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OE Atobatele --- Department of Biological Sciences, Nigeria OA Ugwumba --- Department of Zoology, NigeriaSpatial and seasonal variation in macrozoobenthic composition, abundance and diversity in Aiba Reservoir were investigated bimonthy between June 2004 and April 2005 using a van Veen grab. A depauperate fauna of nine taxa was recorded. Generally, larger numbers of taxa... -
Food and feeding ecology of Tylochromis jentinki (Teleostei: Cichlidae) in Ebrié Lagoon, Ivory Coast, with emphasis on spatial, size and temporal variation in fish diet
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KJ Konan --- , Côte d'Ivoire BC Atse --- , Côte d'Ivoire NJ Kouassi --- , Côte d'IvoireThe diet, gut fullness and reproductive state of Tylochromis jentinki were investigated monthly from February 2004 to January 2006 in Ebrié Lagoon, Ivory Coast. A total of 1850 specimens ranging in size from 75 to 235 mm standard length (SL)... -
Population structure and reproductive biology of Schilbe intermedius (Teleostei: Schilbeidae) in the Pendjari River, Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Ahouansou Montcho --- , A Chikou --- , PA Lalèyè --- , KE Linsenmair --- , GermanyThis study, the first on fish reproduction in the Pendjari River, investigated aspects of the reproductive biology of Schilbe intermedius. A total of 429 females and 239 males were collected from March 2007 to February 2008. Females were larger than... -
Impact of abattoir waste on Woji Creek, Port Harcourt, Nigeria, using physicochemistry and macrozoobenthic diversity indices
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Zabbey --- Department of Animal Science and Fisheries, Nigeria I Etela --- Department of Animal Science and Fisheries, NigeriaThe impact of waste discharge from Zoo abattoir, Port Harcourt, on the environmental quality of Woji Creek was studied from April 2001 to March 2002 using physicochemistry and diversity of benthic animals as indicators. Priority physicochemical parameters (total suspended solid,... -
Fish distributions in the Rondegat River, Cape Floristic Region, South Africa, and the immediate impact of rotenone treatment in an invaded reach
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OLF Weyl --- , South Africa BR Ellender --- Department of Ichthyology and Fisheries Science, South Africa DJ Woodford --- , South Africa MS Jordaan --- , South AfricaAlien fishes are considered the most serious threat to native headwater stream fishes in South Africa. A 4 km reach of the Rondegat River is the first section of a South African river to be rehabilitated through the attempted removal... -
Spawning migrations of Lake Tana Labeobarbus spp. (Teleostei: Cyprinidae) in the Ribb River, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Anteneh --- Department of Biology, College of Science, Ethiopia A Getahun --- Fisheries and Aquatic Science Stream, Department of Zoological Sciences, Ethiopia E Dejen --- FAO Subregional Office for Eastern Africa, EthiopiaSpawning migration of the endemic Labeobarbus species of Lake Tana upstream and downstream of a proposed site for a large dam on the Ribb River, Ethiopia, were investigated to assess the dam's potential impact on these fish. Fish were collected... -
Temporal variations in the food habits of some fish species in Lake Nokoué, Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Gnohossou --- Laboratoire d’Hydrobiologie et Aquaculture, Bénin P Lalèyè --- Laboratoire d’Hydrobiologie et Aquaculture, Bénin P Atachi --- Laboratoire d’Hydrobiologie et Aquaculture, Bénin G Magali --- Laboratoire EcoLab, UMR 5245 CNRS-UPS-INPT, France MC Villanueva --- Laboratoire d’Agronomie, Environnement et Écotoxicologie, France J Moreau --- Laboratoire d’Agronomie, Environnement et Écotoxicologie, FranceStomach contents of the 12 most abundant fish species in Lake Nokoué, Benin, collected between 2003 and 2005, were analysed for temporal variations in their diet. Several species showed seasonal shifts in their diets based on benthic prey abundance and... -
Reproductive biology of Bagrus docmak in the Victoria Nile, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C Aruho --- National Fisheries Resources Research Institute, Uganda RK Basiita --- National Fisheries Resources Research Institute, Uganda D Kahwa --- Department of Wildlife and Animal Resources Management, Uganda G Bwanika --- Department of Zoology, Uganda J Rutaisire --- National Fisheries Resources Research Institute, UgandaAspects of the reproductive biology of Bagrus docmak in the Victoria Nile were investigated between November 2005 and October 2006. Macroscopic and histological analysis of the gonads confirmed it as an asynchronous batch spawner which spawns throughout the year with... -
Initial Spacing of Pinus patula for Maximum Yield of Pulp-wood over a 16-year Rotation
Item type: Journal Article • Journal: South African Forestry Journal • Authors: B. Bredenkamp --- Natal Forestry Research Centre,Analysis of previously published data showed that volume production of Pinus patula on a 16-year rotation reaches a maximum with initial espacements of 2 430 ± 620 stems/ha. Expected volume yields and diameters for a range of espacements are provided. -
The Silvicultural Treatment of Eucalypt Plantations in Southern Africa
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.J. Poynton --- Department of Water Affairs, Forestry and Environmental Conservation,Approximately 500 000 ha has been afforested in Southern Africa with Eucalyptus spp.—principally E. grandis—for the production of mining timber, pulpwood, rough building and fencing materials and fuel on a short rotation of 6 to 10 years, for telegraph and... -
Rectangular Espacement Does Not Cause Stem Ellipticity in Eucalyptus grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Brian Bredenkamp --- Natal Forestry Research Centre, Department of Environment Affairs,Eucalyptus grandis grown with varying degrees of rectangularity of growing space showed that stem ellipticity could not be attributed to proximity of nearest neighbours. Stem ellipticity was markedly orientated along wind directions prevailing in the Eastern Transvaal. Extreme rectangularity of... -
Early Respacement and Fewer Thinnings can Increase Profitability of Coniferous Sawtimber Production
Item type: Journal Article • Journal: South African Forestry Journal • Authors: B.V. Bredenkamp --- Natal Forestry Research Centre, J. S.J. Venter --- , H. Haigh --- Natal Forestry Research Centre,A pine sawtimber production regime using wider initial spacing, early respacement, fewer thinning operations and a shortened rotation is proposed. The proposal is compared with a commonly accepted regime for ranges of interest rates and pulpwood prices. Benefits are lowered... -
Effects of Spacing and Age on Growth of Eucalyptus grandis on a Dry Zululand Site
Item type: Journal Article • Journal: South African Forestry Journal • Authors: B.V. Bredenkamp --- ,The response of unthinned Eucalyptus grandis to initial stand density ranging from 25 to 6 670 stems per hectare up to 22 years of age is described using simple quadratic functions. This method resulted in distorted estimates of growth parameters... -
AN ASSESSMENT OF THE GROWTH RATE OF MPASA, OPSABIDIUM MICROLEPIS (GUNTHER, 1864) (PISCES: CRYPRINIDAE), BY LENGTH FREQUENCY ANALYSIS
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: D. Tweddle --- Fisheries Department, MalawiThe mpasa, Opsaridiwm microlepis, is an important commercial species in areas of Lake Malawi near major inflowing rivers during annual spawning migrations. Plots of length frequency data collected over a series of years from mpasa catches in the Bua and... -
Population Dynamics and Spawning of the Flatfish Solea Bleekeri and Pseudorhombus Arsius in the Intertidal Area of Inhaca Island, Moçambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A. M. P. Van Schie W. F. De BoerThe population dynamics of flatfish Solea bleekeri and Pseudorhombus arsius within the intertidal area of Inhaca Island, Moçambique, was investigated using bottom trawl data collected during summer (December 1996 – March 1997) and winter (June 1997 – August 1997). The... -
Spatial Comparisons of Populations of an Indigenous Limpet Scutellastra Argenvillei and an Alien Mussel Mytilus Galloprovincialis Along a Gradient of Wave Energy
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C. N. Steffani G. M. BranchIn the 1970s, the Mediterranean mussel Mytilus galloprovincialis invaded the South African coast and spread rapidly to dominate much of the West Coast, indicating either the opportunity to occupy a vacant niche or its superior competitive capability over indigenous species... -
Spatial Variability in the Mudprawn Upogebia Africana on the South-east Coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: O. Dubula T. A. LasiakA nested sampling design was used to examine the variability in density, biomass, sex ratio and size of the estuarine mudprawn Upogebia africana in six estuaries on the south-east coast of South Africa. The objectives were to test the general... -
Stock Structure of Snoek Thyrsites Atun in the Benguela: A New Hypothesis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M. H. GriffithsIt has long been accepted that snoek Thyrsites atun in the Benguela system constitute a single stock that undergoes seasonal longshore migration in waters between southern Angola and the west coast of South Africa. Based on a review of past... -
Adult Movement and Larval Dispersal of Argyrozona Argyrozona (Pisces: Sparidae) from a Temperate Marine Protected Area
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S. L. Brouwer M. H. Griffiths M. J. RobertsAdult emigration and larval dispersal of carpenter Argyrozona argyrozona from the Tsitsikamma National Park (TNP), South Africa, were investigated using mark-recapture data and Acoustic Doppler Current Profiler measurements of currents. Tagging data showed that adult carpenter were mainly resident, with... -
Quantification and representation of potential spatial interactions in the southern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L. Drapeau L. Pecquerie P. Fréon L. J. ShannonThis work explores the potential spatial interactions between 13 key commercial species of the southern Benguela ecosystem: sardine Sardinops sagax, anchovy Engraulis encrasicolus, round herring Etrumeus whiteheadi, horse mackerel Trachurus trachurus capensis, chub mackerel Scomber japonicus, chokka squid Loligo vulgaris... -
Stage-dependent vertical distribution of pelagic fish eggs on the western Agulhas Bank, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MT Dopolo CD van der Lingen CL MoloneyThe vertical distributions of eggs of anchovy Engraulis encrasicolus, sardine Sardinops sagax and round herring Etrumeus whiteheadi over the western Agulhas Bank, South Africa, were sampled between 0m and 100m, using an opening-closing WP-2 net, to investigate differences in developmental... -
Growth and reproduction of the pelagic goby Sufflogobius bibarbatus off the Orange River, southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: YC Melo F Le ClusAge, growth and reproduction of the pelagic goby Sufflogobius bibarbatus was investigated for males and females caught in demersal trawls between the Orange River and Port Nolloth on the west coast of southern Africa. Females had larger otoliths than males... -
Currents along the Tsitsikamma coast, South Africa, and potential transport of squid paralarvae and ichthyoplankton
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Roberts M van den BergIn July 1998, a bottom-mounted Acoustic Doppler Current Profiler was deployed at 36m depth in the centre of the Tsitsikamma National Park on the eastern Agulhas Bank, South Africa. The purpose was to investigate transport of chokka squid Loligo vulgaris... -
The reproductive biology of Diplodus argenteus (Sparidae) in the coastal upwelling system of Cabo Frio, Rio de Janeiro, Brazil
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GS David R Coutinho I Quagio-Grassiotto JR VeraniThe reproductive biology of the seabream Diplodus argenteus, a dominant coastal fishery species, was investigated over two consecutive seasons (2001–2002) at Cabo Frio, Brazil, a low-latitude upwelling system. The sex ratio was dominated by females (1.4:1.0) and the length-at-50% sexual... -
Characterising and comparing the spawning habitats of anchovy Engraulis encrasicolus and sardine Sardinops sagax in the southern Benguela upwelling ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NM Twatwa CD van der Lingen L Drapeau CL Moloney JG FieldThe spawning habitats of anchovy Engraulis encrasicolus and sardine Sardinops sagax in the southern Benguela upwelling ecosystem were characterised by comparing their egg abundances with environmental variables measured concomitantly during two different survey programmes: the South African Sardine and Anchovy... -
Diet of Cape fur seals Arctocephalus pusillus pusillus at three mainland breeding colonies in Namibia. 1. Spatial variation
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Mecenero J-P Roux LG Underhill MN BesterThe diet composition of Cape fur seals Arctocephalus pusillus pusillus was investigated from three breeding colonies in Namibia between January 1994 and April 2002 using scat analysis. Otolith numbers were corrected for those lost during digestion before determining the percentage... -
Management of Argyrozona argyrozona (Pisces: Sparidae) in South Africa based on per-recruit models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Brouwer MH GriffithsCarpenter Argyrozona argyrozona is an endemic sparid that constitutes an important component of the South African linefishery between Cape Agulhas and Port Alfred, where it exists as two stocks; one on the central Agulhas Bank and the other on the... -
Distribution patterns of striped mullet Mugil cephalus in mangrove creeks, Zanzibar, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AW Mwandya --- Department of Animal Sciences and Production, Tanzania YD Mgaya --- Department of Aquatic Sciences and Technology, Tanzania MC Öhman --- Department of Zoology, Sweden I Bryceson --- , Norway M Gullström --- Department of Zoology, SwedenSpatial and seasonal variations in density of striped mullet Mugil cephalus were investigated in four mangrove creeks in Zanzibar, Tanzania, during a one-year cycle. Fish were collected monthly in the lower, intermediate and upper reaches of each creek using a... -
A spatial- and age-structured assessment model to estimate the impact of illegal fishing and ecosystem change on the South African abalone Haliotis midae resource
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ÉE Plagányi --- Department of Mathematics and Applied Mathematics, South Africa DS Butterworth --- Department of Mathematics and Applied Mathematics, South AfricaThe management of abalone stocks worldwide is complicated by factors such as illegal fishing combined with the difficulties of assessing a sedentary (but not immobile) resource that is often patchily distributed. The South African abalone Haliotis midae fishery is faced... -
A 21-year ichthyoplankton collection confirms sardine spawning in KwaZulu-Natal waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AD Connell --- , South AfricaPelagic eggs of marine fish were collected weekly from shelf waters at Park Rynie on the KwaZulu-Natal south coast from 1987 to 2007 to investigate seasonal and annual patterns in the abundance of sardine Sardinops sagax eggs. After a sudden... -
The 2005 KwaZulu-Natal sardine run survey sheds new light on the ecology of small pelagic fish off the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Coetzee --- Branch Fisheries, Department of Agriculture, South Africa D Merkle --- Branch Fisheries, Department of Agriculture, South Africa L Hutchings --- Oceans and Coasts, Department of Environmental Affairs, South Africa CD van der Lingen --- Branch Fisheries, Department of Agriculture, South Africa M van den Berg --- Oceans and Coasts, Department of Environmental Affairs, South Africa MD Durholtz --- Branch Fisheries, Department of Agriculture, South AfricaDespite much public awareness surrounding the annual migration of sardine Sardinops sagax northward along the east coast of South Africa in winter each year, relatively little research effort has been expended to improve understanding of the ‘sardine run’. For this... -
Influence of the sardine run on selected nearshore predatory teleosts in KwaZulu-Natal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ST Fennessy --- , South Africa P Pradervand --- , New Zealand PA de Bruyn --- , SpainThe relationships between shore-angling catch rates of nearshore predatory teleosts in KwaZulu-Natal, South Africa, and the timing of the sardine run were examined using a multiple regression model. Results showed that catch rates of five (elf Pomatomus saltatrix, garrick Lichia... -
Aspects of the biology and fisheries of an economically important sparid Dentex macrophthalmus (Bloch 1791) in the Namibe province, Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Potts --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa LA Inácio --- , Angola CV Santos --- , Angola TJ Richardson --- Department of Ichthyology and Fisheries Science, PO Box 94, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, PO Box 94, South AfricaThe sparid Dentex macrophthalmus is a widespread, important fishery species along most of the West African coast from southern Namibia to the Mediterranean. In southern Angola it is an important artisanal species targeted predominantly by handline fishers. A biological and... -
Distribution and seasonality of cetaceans in tropical waters between Angola and the Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CR Weir --- , UKThe species richness, spatial distribution, seasonality and interspecific associations of cetaceans in tropical oceanic waters between the Gulf of Guinea and Angola were examined using 5 905.3 h of dedicated survey effort collected from 13 platforms of opportunity (geophysical vessels)... -
Cyclonic eddies reveal Oegopsida squid egg balloon masses in the Agulhas Current, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Roberts --- Oceans and Coasts, Department of Environmental Affairs, South Africa T Zemlak --- Department of Integrative Biology, Canada A Connell --- , South AfricaIn 2005, 2006, 2007 and 2011, distinct Oegopsida squid egg masses were observed by scuba divers on the narrow southern KwaZulu-Natal (KZN) shelf in depths of 35–50 m off the coastal resorts of Park Rynie, Pumula and Port Edward, South... -
Area-use patterns and diel movements of white steenbras Lithognathus lithognathus in a temporarily open/closed South African estuary, inferred from acoustic telemetry and long-term seine-netting data
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Bennett --- Department of Ichthyology and Fisheries Science, South Africa PD Cowley --- , South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa AK Whitfield --- , South AfricaAcoustic telemetry and long-term seine-netting data were used to assess distribution, area use, home range dynamics and movement patterns of estuarine-dependent juvenile white steenbras Lithognathus lithognathus in the temporarily open/closed East Kleinemonde Estuary. Using 15 years of biannual seine-netting data,... -
Ecological distribution of the shrimp Nematopalaemon schmitti (Crustacea: Decapoda: Caridea) in three bays on the south-eastern coast of Brazil
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AC Almeida --- NEBECC (Crustacean Biology, Ecology and Culture Study Group), Departamento de Zoologia, Brazil A Fransozo --- NEBECC (Crustacean Biology, Ecology and Culture Study Group), Departamento de Zoologia, Brazil GM Teixeira --- NEBECC (Crustacean Biology, Ecology and Culture Study Group), Departamento de Zoologia, Brazil KAN Hiroki --- NEBECC (Crustacean Biology, Ecology and Culture Study Group), Departamento de Zoologia, Brazil M Furlan --- NEBECC (Crustacean Biology, Ecology and Culture Study Group), Departamento de Zoologia, Brazil G Bertini --- , BrazilThe relationships between the spatial and temporal variations in the abundance of the shrimp Nematopalaemon schmitti and water temperature, salinity, and texture and organic-matter content of the sediment, were analysed in Ubatumirim, Ubatuba and Mar Virado bays on the northern... -
Spawning strategies and transport of early stages of the two Cape hake species, Merluccius paradoxus and M. capensis, in the southern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B Grote --- , Germany EK Stenevik --- , Norway W Ekau --- , Germany HM Verheye --- Oceans and Coasts Research, Department of Environmental Affairs, South Africa MR Lipiński --- Branch: Fisheries, Department of Agriculture, South Africa W Hagen --- Marine Zoology, GermanySeasonal and short-term variability of environmental parameters influence the spawning strategies of fish species. In this study, the spawning strategies and the transport of early stages of the two Cape hake species off South Africa were investigated. Distribution of eggs... -
The effects of barotrauma on five species of South African line-caught fish
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SE Kerwath --- Fisheries Research, Department of Agriculture, South Africa CG Wilke --- Fisheries Research, Department of Agriculture, South Africa A Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South AfricaManagement measures for South African line-caught fish include output controls such as closed seasons, bag and size limits and no-take moratoria. The main condition for these measures to be effective is that undesirable catches can be successfully released. However, most... -
Reproductive biology of horse mackerel Trachurus capensis and Trachurus trecae in Namibia and Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HON Ndjaula --- Department of Biology, Norway J-O Krakstad --- , Norway OS Kjesbu --- , NorwayHarvest control measures for Namibia and Angola are defined using reference points for spawning biomass, which requires knowledge of spawning potential and dynamics of fishery stocks. The reproductive biology of two species of horse mackerel, Trachurus capensis and Trachurus trecae,... -
Stock-environment recruitment analysis for Namibian Cape hake Merluccius capensis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Kainge --- National Marine Information and Research Centre, Namibia N Bahamon --- Centre d'Estudis Avançats de Blanes (CEAB-CSIC), Spain CH Bartholomae --- National Marine Information and Research Centre, Namibia JN Kathena --- National Marine Information and Research Centre, Namibia AK van der Plas --- National Marine Information and Research Centre, Namibia A Gordoa --- Centre d'Estudis Avançats de Blanes (CEAB-CSIC), SpainThe factors modulating recruitment success of Cape hake Merluccius capensis in Namibian waters are still unresolved. In this study, we used generalised additive models, regression tree analysis and the conventional Ricker model to examine the effect of environmental indices and... -
Extent of Access to Information and Communications Technology by the Rural Population of South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Moses Mefika Sithole --- Centre for Science, Technology and Innovation Indicators (CeSTII), South Africa Cheryl Moses --- Centre for Science, Technology and Innovation Indicators (CeSTII), Yul Derek Davids --- Population Health, Health Systems and Innovation (PHHSI), Saahier Parker --- Centre for Science, Technology and Innovation Indicators (CeSTII), Julien Rumbelow --- Centre for Science, Technology and Innovation Indicators (CeSTII), Neo Molotja --- Centre for Science, Technology and Innovation Indicators (CeSTII), Demetre Labadarios --- Centre for Science, Technology and Innovation Indicators (CeSTII),This paper investigates the trends in access to Information and Communications Technology (ICT) in rural compared to the urban areas of South Africa. Using data from the South African Social Attitudes Survey (SASAS) covering the period from 2003 to 2009,... -
Investigating Disparities in Access and Returns to Endowments between Male and Female Headed Households in Cameroon
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Boniface Ngah Epo --- Department of Economics and Management, Yaoundé Francis Menjo Baye --- Department of Economics and Management, Yaoundé Nadine Teme Angele Manga --- Department of Economics and Management, YaoundéThis paper investigates disparities in access and returns to endowments between male and female headed households in Cameroon using the Oaxaca–Blinder decomposition and the 2007 Cameroon Household Consumption Survey. In particular, synthetic variables for education and health constructed by the... -
Growth and yield models for Eucalyptus grandis grown in Swaziland
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M du Plessis --- , South Africa H Kotze --- , South AfricaThe aim of this study was to develop a stand-level growth and yield model for short-rotation Eucalyptus grandis grown for pulp wood production at Piggs Peak in Swaziland. The data were derived from a Nelder 1a spacing trial established with... -
Effects of irregular stand structure on tree growth, crown extension and branchiness of plantation-grown Pinus patula
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Simon A Ackerman --- Department of Forest and Wood Science, South Africa Pierre A Ackerman --- Department of Forest and Wood Science, South Africa Thomas Seifert --- Department of Forest and Wood Science, South AfricaThe practice of combining row and selective thinning in commercial pine plantation silviculture carries the risk of unwanted irregularities in tree distribution, a situation that is aggravated when tree selection during marking is poor. The potential consequences of poor tree... -
Plankton assemblages and environmental gradients in the middle reaches of the Imo River, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Zabbey FD Sikoki J EdoghotuPlankton communities and physical variables in c. 5 km of the middle reaches of the Imo River, subject to sand dredging and oil/gas exploration, were surveyed in 2003 providing a preliminary checklist of plankton assemblages in relation to environmental parameters... -
Population dynamics, life-history traits of and habitat use by two sympatric nothobranchiid fishes in a tropical stream, Kainji Lake Basin, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BD Olaosebikan SL Lamai T MusschootPopulation dynamics and life-history traits of two sympatric nothobranchiid killifishes, Epiplatys bifasciatus and E. spilargyreius, were studied for 24 months in an intermittent stream in the Kainji Lake Basin, Nigeria. Epiplatys bifasciatus was more abundant throughout the study period, but... -
Rapid biological assessment of the fishery potential of Xonxa Dam, near Queenstown, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TJ Richardson AJ Booth OLF WeylRapid biological assessments have been proposed as the most cost-effective approach to identify suitable target species and to set initial catch and fishing effort levels for new fisheries. Xonxa Dam, a turbid irrigation dam situated in the White Kei catchment,... -
Gonad development in the freshwater oyster Etheria elliptica (Bivalvia: Etheriidae) in northern Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Ampofo-Yeboah --- Department of Renewable Natural Resources, M Owusu-Frimpong --- Department of Applied Biology, K Yankson --- School of Biological Sciences,Gonad development in the freshwater oyster Etheria elliptica from the White Volta River at Nawuni and the Oti River at Sabari (northern Ghana) was studied by histological examination from March to July 1999. Five developmental stages—developing, ripening, ripened, spawning and... -
Life history of the steentjie Spondyliosoma emarginatum (Cuvier 1830) in Langebaan Lagoon, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Fairhurst CG Attwood MD Durholtz CL MoloneyMorphometric measurements and fin spine and ray counts, external colouration, macroscopic gonad stage and diet were recorded for steentjie Spondyliosoma emarginatum (Pisces: Sparidae) collected from Langebaan Lagoon between August 2004 and September 2005. Sagittal otoliths were removed, and age estimates... -
Comparison of the effects of different linefishing methods on catch composition and capture mortality of South African temperate reef fish
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Götz SE Kerwath CG Attwood WHH SauerThe effects of hook size, bait type, water depth and fishing effort on the selectivity and capture mortality of reef fish were investigated in a standardised fishing experiment on the temperate south coast of South Africa. A total of 2... -
A Bayesian state-space model for mixed-stock migrations, with application to Northeast Atlantic mackerel Scomber scombrus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CL Cunningham DG Reid MK McAllister GP Kirkwood CD DarbyManagement of fisheries that exploit mixed-stock populations relies on assumptions made concerning stock structure and mixing in different areas. To address the problems of accounting for uncertainty when formulating scientific advice for the management of highly migratory fish stocks, management... -
Merluccius capensis spawn in Namibian waters, but do M. paradoxus?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Kainge OS Kjesbu A Thorsen AG SalvanesSpawning time and areas, and the length of the spawning season of shallow-water (Merluccius capensis) and deep-water (M. paradoxus) hake, were investigated from bottom trawl collections taken in Namibian waters between September 1998 and October 2000 and from August to... -
Spatial distribution of Nemesis lamna Risso 1826 (Copepoda: Siphonostomatoida: Eudactylinidae) on the gills of white sharks Carcharodon carcharias off KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Dippenaar R van Tonder S Wintner P ZunguThe selection of a specific site of attachment by a copepod parasite is determined by a set of mostly unknown factors. The spatial distribution of Nemesis lamna on the gill filaments of white sharks Carcharodon carcharias was investigated. The complete... -
Spatial diversity of nematode and copepod genera of the coral degradation zone along the Kenyan coast, including a test for the use of higher-taxon surrogacy
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M De Troch M Raes A Muthumbi H Gheerardyn A VanreuselThe biodiversity of meiofauna in the coral degradation zone along the Kenyan coast was examined with special emphasis on the most abundant taxa, Copepoda and Nematoda. Communities from three microhabitat types (coralline sediment, coral gravel and coral fragments) at two... -
Status of the estuarine-dependent riverbream Acanthopagrus berda (Sparidae) harvested by the multi-sectoral fishery in Kosi Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N James NG Hall LE Beckley BQ Mann WD RobertsonA stock assessment was undertaken for the tropical sparid Acanthopagrus berda harvested in the Kosi Bay estuarine system, northern KwaZulu-Natal, South Africa, by a multi-sectoral fishery using traditional traps and gillnets, and recreational angling using rod-and-line. Input parameters used in... -
Reproductive system and the spermatophoric reaction of the mesopelagic squid Octopoteuthis sicula (Rüppell 1844) (Cephalopoda: Octopoteuthidae) from southern African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HJT Hoving MR Lipiński JJ VidelerReproductive features of the poorly known oceanic squid Octopoteuthis sicula are described and quantified to gain insight into the reproductive biology of the species. The data are based on 39 complete and partial specimens from southern African waters, collected between... -
From beans to breams: how participatory workshops can contribute to marine conservation planning
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Wheeler FMJ Chambers R Sims-Castley RM Cowling DS SchoemanSystematic conservation planning is increasingly being used in the marine environment, but the relative paucity of data on marine patterns and process still presents a problem, particularly in developing countries. For example, along the south-eastern component of the Agulhas marine... -
Fischer's Diagonal Condition for Lattice-Valued Convergence Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gunther JägerWe study a generalization of a diagonal condition which classically ensures that a convergence space is topological. We show that only under an additional condition, which classically is always true, the validity of this diagonal condition implies that a Heyting... -
Quotient Maps: Frame-Valued Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: H. Boustique G. RichardsonIt is known that the category of frame-valued convergence spaces is topological, cartesian-closed and extensional. Properties of quotient maps between objects in this category are investigated here; in particular, it is shown that quotient maps are productive under arbitrary products. -
Convolution Operators that Factor Through a Hilbert Space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Paulette SaabLet G be a compact abelian group, and let X be a Banach space. We investigate vector-valued extensions of a result of Pisier concerning certain convolution operators that factor through Hilbert spaces. For example we show that X is finite... -
A Description of the Space of Banach Space-valued Absolutely p-summable Sequences
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: StuartF. Cullender CoenraadC.A. LabuschagneConradie and Swart described the sequence space l p strong(X) of Banach space-valued absolutely p-summable sequences as the Banach space of cone absolutely summing operators (1-concave operators) from c 0 to X for p = 1, or l... -
Stability on Local Unconditional Structure and the Gordon-Lewis Property in Tensor Products
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: D. Puglisi G. SaluzzoWe show that if X is an L 1-space (resp. L ∞-space) and Y a Banach space, then X ⊗∧ Y (resp. X ⊗∨ Y) has the local unconditional structure (l.u.st.) property (or GL-property) if Y does. -
Measure of compactness for filters in the approach setting
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Frédéric MynardNew explicit descriptions of the reflections of a convergence-approach space on pseudo-approach, pre-approach and approach spaces are given. A measure of compactness for filters is introduced in the context of convergence-approach spaces. It is shown that this measure generalizes all... -
On convergence completeness in symmetric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: SeithutiP. MoshokoaThe notion of a convergence complete symmetric space is introduced in [6]. In this paper we shall show that every symmetric space admits a weakly S-convergence complete symmetric space. As applications of convergence completeness, we present some fixed point results... -
A note on regular martingales in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mareli Korostenski CoenraadC.A. LabuschagneWe consider regular martingales (i.e., martingales which can be written as differences of two positive martingales) in the measure-free setting of Riesz spaces. The aim of this note is to show that the space of such martingales is a Riesz... -
Level spaces for lattice-valued uniform convergence spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gunther JägerWe define level structures for lattice-valued uniform spaces and lattice-valued uniform convergence spaces. We show that these structures characterize the spaces from which they are obtained and use them to show that the categories of probabilistic uniform convergence spaces, of... -
Frame valued stratified generalized convergence groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: T.M.G. Ahsanullah Jawaher Al-MufarrijFollowing the notion of stratified L-fuzzy convergence space of Gunther Jäger [Quaest. Math. 24 (2001), 501–517], we introduce the notion of a stratified L-generalized convergence group, and look into some other objects, namely, stratified L-Kent convergence groups, and stratified L-principal... -
On Weaker Forms of Separability
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Maddalena Bonanzinga Filippo Cammaroto Mikhail Matveev Bruno PanseraTwo properties each of which is equivalent to separability for regular spaces and is weaker than separability in general are considered as well as the corresponding cardinal functions. -
Stone-C˘ech Compactifications of Ditopological Texture Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Aysşegül Altay Uğur Murat DikerA texturing on a set S is a point separating, complete, completely distributive lattice S of subsets of S with respect to inclusion which contains S, Ø and for which arbitrary meet coincides with intersection and finite joins coincide with... -
Characterization of Vector Fields on the Frölicher Standard n-Simplex, Imbedded in R n , and Hamiltonian Formalism on Differential Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: PatriceP. Ntumba AugustinT. BatubengeThis paper is an attempt to the symplectization of smooth unusual, but standard imbedded subspaces of R n like a n-simplex, for the purpose of modelling Hamiltonian and Lagrangian systems thereon. We show that these subspaces are obtained by the... -
Functorial relationships between lattice-valued topology and topological systems
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: J.T. Denniston S.E. RodabaughThis paper investigates functorial relationships between lattice-valued topology (arising from fuzzy sets and fuzzy logic) and topological systems (arising from topological and localic aspects of domains and finite observational logic in computer science). Two such relationships are embeddings from TopSys... -
Into isomorphisms in tensor products of Banach spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Eve Oja Vaiki RandalaWe establish quantitative extensions of two Grothendieck's results on into isomorphisms in projective tensor products. Among others, we prove the following. Let Y be a closed subspace of a Banach space Z and let j : Y → Z denote... -
Long-standing open problems of Banach space theory: My personal top ten
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Albrecht Pietsch* --- , GermanyEvery serious scientist wants to discover fundamental results. However, due to outer circumstances expressed by the slogan ‘publish or perish,’ the reality looks quite different: too many mathematicians are led to deal only with problems that promise a quick and... -
When is every Hausdorff continuous interval-valued function bounded by continuous functions?
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Nicolae Dâneţ --- , RomaniaIn this paper we characterize the topological spaces X for which ℍ ft (X) = ℍ cm (X). Here ℍ ft (X) is the set of all finite Hausdorff continuous interval-valued functions on X and ℍ cm (X) is the... -
The completion of uniform convergence spaces and an application to nonlinear PDEs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jan Harm van der Walt --- Department of Mathematics and Applied Mathematics, South AfricaThis paper deals with the solution of large classes of systems of nonlinear partial differential equations (PDEs) in spaces of generalized functions that are constructed as the completion of uniform convergence spaces. The existence result for the mentioned systems of... -
Feynman's Electromagnetic Fields Induced by Moving Charges and the Existence and Uniqueness of Solutions to the N-Body Problem of Electrodynamics
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: VictorM. Bogdan --- Department of Mathematics, USAGiven n charges interacting with each other according to Feynman's law. Let (r j (t), v j (t)) denote the position and velocity of the charge q j . The list y(t) of all such vectors is... -
Convolution Operators on Spaces of Vector-Valued Functions that are Completely Continuous
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Paulette Saab --- Department of Mathematics, USALet X be a Banach space and let G be a compact abelian group. We study when convolution operators that are induced by a regular Borel scalar measure v on G are Completely Continuous (or Dunford-Pettis) operators (respectively, Weak-Dunford-Pettis) when... -
Relationship between the edgewise compression strength of corrugated board and the compression strength of liner and fluting medium papers
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: K Dimitrov --- Department of Chemical Engineering, South Africa M Heydenrych --- Department of Chemical Engineering, South AfricaThe compression strength of a corrugated board box is a direct measure of its stacking strength. The edgewise compression strength of corrugated board is the major contributor to the box stacking strength. This relation can be further extended to the... -
Shoot allometry of Jatropha curcas
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: SB Ghezehei --- Department of Plant Production and Soil Science, South Africa JG Annandale --- Department of Plant Production and Soil Science, South Africa CS Everson --- Department of Plant Production and Soil Science, South AfricaThe South African government has banned planting of Jatropha curcas L. (Jatropha), potentially a multipurpose tree and biofuel source, owing to insufficient knowledge about the species. Use of allometry as a non-destructive method of monitoring growth and biomass attributes of... -
Structural matrix algebras related to finite distributive lattices
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E. Akkurt --- Gebze Institute of Technology, Turkey M. Akkurt --- Gebze Institute of Technology, Turkey G.P. Barker --- University of Missouri, Kansas City, USAIn this paper, we investigate the relation between a structural matrix algebra and the lattice properties of its lattice of invariant subspaces, and reprove known results in a fresh and an explanatory way. Moreover, we also prove the theorem which... -
On the existence and approximation of fixed points for Ćirić type contractive mappings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: B. Djafari-Rouhani --- Department of Mathematical Sciences, USA Sirous Moradi --- Department of Mathematics, IranLet (X, d) be a complete convex metric space, and C be a nonempty, closed and convex subset of X. We consider Ćirić type contractive self-mappings T of C satisfying: for all x, y ∈ C, where 0 < a... -
Morphine sparing effect of low dose ketamine during patient controlled analgesia
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: FJ Smith --- Department of Anaesthesiology, CGJ Briel --- Department of Anaesthesiology, PJ Becker --- Unit for Biostatistics, South AfricaObjective: To compare the quality of intravenous patient controlled analgesia (PCIA) of low dose morphine plus ketamine with morphine. Design: Double blind case control study. Setting: Academic hospital. Patients: Thirty-six patients scheduled for elective abdominal hysterectomy were randomly divided into... -
The child with asthma for anaesthesia
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: R Spies --- Department of Anaesthesia, South AfricaAsthma is one of the most common coexisting diseases in children, and a major cause of mortality and morbidity in children. Morbidity is measured by school absences, emergency department visits and hospitalisations. Asthma continues to take the lives of children... -
Transient aphasia following spinal anaesthesia in an orthopaedic patient
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: B Tripat --- Department of Anaesthesia and Critical Care, India G Ruchi --- Department of Anaesthesia and Critical Care, India T Sonika --- Department of Anaesthesia and Critical Care, IndiaA 50-year-old male [American Society of Anesthesiologists (ASA) grade II] was scheduled for lower limb orthopaedic surgery. The subarachnoid space was localised with difficulty at L3/4 interspace and 3 ml of hyperbaric bupivacaine was given. Within a few minutes, the... -
The anaesthetic management of microgravity-exposed individuals
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: J Van Der Walt --- Department of Anaesthesia, AH Ernst --- Department of Anaesthesia,Mankind's imminent occupation of low Earth orbit beyond that of a scientific outpost and daring engineering nature that will land astronauts on Mars, will pose significant challenges to anaesthesia providers. The increased number of space tourists and workers who spend... -
An unusual case of ST elevation
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: K Gordon --- Department of Anaesthetics, Critical Care, and Pain Management, R Wise --- University of KwaZulu-Natal,This report presents an unusual case of ST elevation on induction of anaesthesia in a patient undergoing an elective, noncardiac surgical procedure. Through scrutiny of this case and its unanticipated events, together with the subsequent workup and management, the diagnosis... -
Avoiding adverse outcomes in anaesthesia. The relevant As: allergy, asthma airway and anaphylaxis
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: A Bosenberg --- Department Anesthesiology and Pain Management, Faculty Health Sciences, USAThe perioperative preparation of children presenting for surgery aims to identify medical problems that might influence the outcome and to institute management strategies to reduce those risks. Adverse respiratory events remain a significant cause of morbidity and mortality in modern... -
On Death and Dying—Forty years later, how well are we dying?
Item type: Journal Article • Journal: South African Family Practice • Authors: DA Cameron --- Department of Family Medicine,In the mid-1960s two doctors, one in London and the other in Chicago, set about changing the accepted medical care of dying patients. In London, Dr Cicely Saunders established St Christopher's Hospice specifically to provide compassionate care for dying patients... -
Microclimate conditions in ventilated wet-walled greenhouses in a subtropical climate: spatial variability
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Michael J Savage --- Agrometeorology Discipline, Soil-Plant-Atmosphere Continuum Research Unit, School of Agricultural, Earth and Environmental Sciences, South AfricaSpatial variations of microclimatic conditions in enclosed north–south (N–S) oriented single-arched greenhouse polycarbonate structures, with a wet-wall providing evaporative cooling at the S end, were investigated and displayed online in near real-time. Temperature-controlled fans at the N end extracted air... -
An “Indian commons” in Durban? limits to mutuality, or the city to come
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Sharad Chari --- Centre for Indian Studies in Africa and Department of Anthropology, South AfricaThis paper explores the ways in which memories of Black South Africans in Durban, identified by racial discourse and often by themselves as Indian and Coloured, reach back to early twentieth century processes of dispossession and occupation. Through historical and... -
Dealing and sharing: the construction of community in a Pretoria public park
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Dennis Edward Webster --- Department of Anthropology and Archaeology, South AfricaThis paper describes how a group of men, who are invisible to the state because they possess no formal legal documentation, such as ID books or passports, and do not take part in the formal economy, live in a public... -
Diagnosing the sexual pattern of Diplodus cervinus hottentotus (Pisces: Sparidae) from southern Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AC Winkler --- Department of Ichthyology and Fisheries Science, South Africa CV Santos --- Faculdade Ciências da Universidade Agostinho Neto (FCUAN), Angola WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe sexual pattern of Diplodus cervinus hottentotus was investigated in southern Angola. Females were significantly smaller and found in greater numbers, with an adult sex ratio of 1.0:0.7, F:M. Histological observations of preserved gonads indicated that the species is a... -
Topological systems versus attachment relations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Cosimo Guido --- Department of Mathematics “Ennio De Giorgi”, Italy Sergey A. Solovyov --- Department of Mathematics and Statistics, Faculty of Science, Czech RepublicThe manuscript makes a category-theoretic comparison between the concepts of topological system of S. Vickers and attachment relation of C. Guido. With the help of the recent definition of the notions in the framework of an arbitrary variety of algebras,... -
Multipliers on noncommutative Orlicz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Louis E. Labuschagne --- School for Comp., Stat. & Math. Sci., Fac. of Nat. Sci., South AfricaWe establish very general criteria for the existence of multiplication operators between noncommutative Orlicz spaces L ψ0 and Lψ1 . We then show that these criteria contain existing results, before going on to briefly look at the extent to which... -
Preliminary examination of hatching season and growth of Engraulicypris sardella (Pisces: Cyprinidae) larvae and juveniles in Lake Malawi
Item type: Journal Article • Journal: African Zoology • Authors: Shinsuke Morioka --- Department of Aquaculture and Fisheries Science, Bunda College of Agriculture, Malawi Emmanuel Kaunda --- Department of Aquaculture and Fisheries Science, Bunda College of Agriculture, MalawiThe hatching period and the growth of Malawian cyprinid Engraulicypris sardella larvae and juveniles collected from two sites along the southwestern shoreline of Lake Malawi were investigated using otolith increment information. The lapillus was used to determine the age in... -
Cephalopod diet of the Cape fur seal, Arctocephalus pusillus pusillus, along the Namibian coast: variation due to location
Item type: Journal Article • Journal: African Zoology • Authors: P.J.N. de Bruyn --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M.N. Bester --- Mammal Research Institute, Department of Zoology and Entomology, South Africa S.P. Kirkman --- Mammal Research Institute, Department of Zoology and Entomology, South Africa S. Mecenero --- Avian Demography Unit, Department of Statistical Sciences, South Africa J.P. Roux --- Ministry of Fisheries and Marine Resources, Directorate of Resource Management, Lüderitz Marine Research, Namibia N.T.W. Klages --- Institute for Environmental and Coastal Management, Nelson Mandela Metropolitan University, South AfricaScats of the Cape fur seal, Arctocephalus pusillus pusillus, were sampled at four mainland colonies, Cape Cross, Atlas Bay,Wolf Bay and Van Reenen Bay, along the Namibian coast over a period of eight years (1994–2001) to assess the diversity and... -
First assessment of estuarine space use and home range of juvenile white steenbras, Lithognathus lithognathus
Item type: Journal Article • Journal: African Zoology • Authors: R. H. Bennett --- Department of Ichthyology and Fisheries Science, South Africa A. R. Childs --- Department of Ichthyology and Fisheries Science, South Africa P. D. Cowley --- South African Institute for Aquatic Biodiversity, South Africa T. F. Næsje --- Norwegian Institute for Nature Research, Norway E. B. Thorstad --- Norwegian Institute for Nature Research, Norway F. Økland --- Norwegian Institute for Nature Research, NorwayThe spatial dynamics and home range sizes of early juvenile white steenbras (Lithognathus lithognathus Cuvier, 1829) in the permanently open Great Fish Estuary, South Africa, were assessed using acoustic telemetry. Seven individuals (154–184 mm fork length) tagged with acoustic transmitters... -
Invasion of a headwater stream by non-native fishes in the Swartkops River system, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Bruce R. Ellender --- Department of Ichthyology and Fisheries Science, South Africa Olaf L. F. Weyl --- South African Institute for Aquatic Biodiversity, South Africa Ernst R. Swartz --- South African Institute for Aquatic Biodiversity, South AfricaIn South Africa, fishes in headwater streams are increasingly being threatened by non-native fish invasions. These invasions originate primarily from source populations in mainstream rivers and impoundments. In the Blindekloof stream, a Swartkops River headwater tributary, the non-native Micropterus salmoides... -
The effects of pastoralism and protection on lion behaviour, demography and space use in the Mara Region of Kenya
Item type: Journal Article • Journal: African Zoology • Authors: Niels L. Mogensen --- Department of Biology, Denmark Joseph. O. Ogutu --- International Livestock Research Institute, Kenya Torben Dabelsteen --- Department of Biology, DenmarkContraction of their historic geographic ranges and conflicts with humans underpins declines in large carnivore populations worldwide. These declines, which characterize pastoral systems where carnivores, people and livestock live in close contact, may be paralleled by changes in carnivore behaviour... -
Residency and small-scale movement behaviour of three endemic sparid fishes in their shallow rocky subtidal nursery habitat, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Peter A. Watt-Pringle --- Department of Ichthyology and Fisheries Science, Rhodes University, South Africa Paul D. Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa Albrecht Götz --- Elwandle Node, South African Environmental Observation Network (SAEON), South AfricaThe residency and small-scale movements of early juveniles (<175 mm fork length) of three sparid fish species were examined in the shallow subtidal zone along a 500 m stretch of rocky coastline near Schoenmakerskop (Eastern Cape Province, South Africa). A... -
Spatial genetic pattern in an economically beneficial insect, the cyclical African wild silk moth (Gonometa postica)
Item type: Journal Article • Journal: African Zoology • Authors: Timothy C. Bray --- Department of Zoology and Entomology, South AfricaThe African wild silk moth (Gonometa postica) exhibits large inter-annual population size fluctuations in the Kalahari region of southern Africa. Spent cocoons from this species are currently being utilized in a local silk industry. An understanding of the recolonization dynamics... -
Solving the challenges of monitoring mobile populations: insights from studies of waterbirds in southern Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Hannah L Thomas --- Percy FitzPatrick Institute, DST–NRF Centre of Excellence, South Africa Philip AR Hockey --- Percy FitzPatrick Institute, DST–NRF Centre of Excellence, South Africa Graeme S Cumming --- Percy FitzPatrick Institute, DST–NRF Centre of Excellence, South AfricaHighly mobile species are difficult to monitor. It is often unclear from abundance estimates whether a population is genuinely declining or simply elsewhere. If the spatial and temporal scales of monitoring are inadequate, the data will only be useful if... -
Can a luxury hotel compete without a spa facility? – Opinions from senior managers of London’s luxury hotels
Item type: Journal Article • Journal: • Authors: Andy Heyes --- Hospitality Management, University of Derby, Derby, United Kingdom Colin Beard --- Sheffield Business School, Sheffield Hallam University, Sheffield, United Kingdom Sjoerd Gehrels --- Academy of International Hospitality Research, Stenden University of Applied Sciences, Leeuwarden, The NetherlandsThe development of the wellness facility within the luxury hotel sector around the world has been evident, with many professionals believing that spas are an expected element within luxury hotels. This paper has been written to provide further consideration for... -
Journeying into interobjectivity: how worlds can be multiple and real
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Andre Goodrich --- Social Anthropology, School of Social and Government Studies, North-West University, South AfricaThe culture-nature division is fundamental to the division of academic labour between the social and natural sciences. In the face of climate change and other broad environmental threats, natural and social scientists are becoming critical of this division of labour... -
The nature of quality of life in residential care facilities: the case of White older South Africans
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Lizanlé van Biljon --- Africa Unit for Transdisciplinary Health Sciences, South Africa Vera Roos --- Africa Unit for Transdisciplinary Health Sciences, South AfricaThis study describes the nature of quality of life (QoL) from the perspective of older South Africans (n = 41) in residential care facilities (female = 75%; age range 62–95 years). The residents participated in individual in-depth interviews and focus groups. They also... -
Incorporating stable isotopes into a multidisciplinary framework to improve data inference and their conservation and management application
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HM Christiansen --- Great Lakes Institute for Environmental Research, Canada AT Fisk --- Great Lakes Institute for Environmental Research, Canada NE Hussey --- Great Lakes Institute for Environmental Research, CanadaThrough its ability to address complex ecological questions and the possibility of analysing large sample sizes to understand population‑level processes, the use of stable isotope analysis (δ13C and δ15N) has grown rapidly in recent years. Importantly, it is now becoming... -
Macroinvertebrate variation in endorheic depression wetlands in North West and Mpumalanga provinces, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Foster --- Department of Zoology, South Africa W Malherbe --- Water Research Group, Unit for Environmental Science and Management, South Africa M Ferreira --- Department of Zoology, South Africa JHJ van Vuren --- Department of Zoology, South AfricaAquatic macroinvertebrates are rarely used in wetland assessments due to their variation. However, in terms of biodiversity, these invertebrates form an important component of wetland fauna. Spatial and temporal variation of macroinvertebrate assemblages in endorheic depressions (locally referred to as... -
Exclusivity, hybridity and community: negotiating place, ethnicity and South African realities
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Michael de Jongh --- Department of Anthropology and Archaeology,Living on a tract of land in the Soutpansberg allocated to them in 1888 by President Paul Kruger for ‘services rendered’ to the erstwhile Transvaal Republic (Zuid-Afrikaansche Republiek), is the hybrid and largely exclusive Buys community. As descendants of Jean... -
Revisiting ‘township tourism’: multiple mobilities and the re-territorialisation of township spaces in Cape Town, South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Jessica L. Dickson --- University of Cape Town, South AfricaThis article explores themes of social space and mobility significant to tourism within the townships near Cape Town, South Africa. Research on the emergence of ‘township tourism’ has produced contrasting interpretations. Some authors describe essentialised notions of ‘Africanness’, ‘culture’, and... -
The effects of stock size and environmental variability on Cape hake recruitment in Namibia: an unsolved puzzle (a comment on Kainge et al. 2013)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J-P Roux --- Lüderitz Marine Research, Namibia MR Wilhelm --- Marine Science Institute, USAMeasuring and forecasting recruitment are central to the understanding and management of fish stocks. Kainge et al. (2013) studied the effect of spawning stock size and environmental fluctuations on the recruitment levels of the Cape hake Merluccius capensis in Namibia... -
The types and treatment outcomes of germ cell tumours of the ovary seen at Groote Schuur Hospital, Cape Town, between 1994 and 2008: a retrospective survey
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: K E A Mohammed --- Division of Radiation Oncology, A L van Wijk --- Division of Radiation Oncology,Objective: This retrospective observational study aims to review patients with malignant ovarian germ cell tumours (MOGCTs) treated at Groote Schuur Hospital over a 15-year period. -
Fertility-sparing treatment in a young patient with complex atypical hyperplasia of the endometrium
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: G C Du Toit --- Unit of Gynaecological Oncology, Tygerberg Hospital, University of Stellenbosch, -
Epithelioid trophoblastic tumour: a report of two cases
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: MMA Elhassan --- Radiation Oncology Department, Sudan H-T Wu --- Department of Anatomical Pathology, AL Van Wijk --- Department of Radiation Oncology, -
Review and empirical comparison of joint mapping of multiple diseases
Item type: Journal Article • Journal: Southern African Journal of Epidemiology and Infection • Authors: Samuel Manda --- Biostatistics Unit, South African Medical Research Council, South Africa Richard Feltbower --- Centre for Epidemiology and Biostatistics, Leeds Institute of Genetics and Therapeutics, University of Leeds, United Kingdom Mark Gilthorpe --- Centre for Epidemiology and Biostatistics, Leeds Institute of Genetics and Therapeutics, University of Leeds, United KingdomThere has been a substantial amount of recent modelling work in multivariate disease-mapping models in epidemiology. These models provide information on similarities, as well as differences, on the effect of risk factors among diseases. Additionally, they can be used to... -
Tetanus: a patient in a primary healthcare setting
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: Indiran Govender --- Department of Family Medicine and Primary Health Care, South Africa Christopher Clark --- Department of Family Medicine and Primary Health Care, South AfricaTetanus is a disease caused by a Clostridium tetani infection, a complication of wounds. We present a case in which a patient presented with seizures and was incorrectly assessed to have epilepsy. Permission to publish this report was obtained from... -
The reproductive biology of an open-water spawning Lake Malawi cichlid, Copadichromis chrysonotus
Item type: Journal Article • Journal: African Zoology • Authors: Lance W. Smith --- Research Officer, MalawiCopadichromis chrysonotus is a zooplanktivorous cichlid member of the diverse fish community inhabiting Lake Malawi’s rocky, littoral habitat. Like most Lake Malawi cichlids, this species’ reproductive strategy is based on maternal mouthbrooding, but it is the only littoral species known... -
Histological validation of gonadal macroscopic staging criteria for Labeo cylindricus (Pisces: Cyprinidae)
Item type: Journal Article • Journal: African Zoology • Authors: Anthony J. Booth --- Department of Ichthyology and Fisheries Science, South Africa Olaf L.F. Weyl --- Department of Ichthyology and Fisheries Science, South AfricaHistological examination of gametogenesis revealed that the current staging criteria used to assess gonadal recrudescence of the redeye labeo, Labeo cylindricus, were adequate. Gametogenesis was qualitatively similar to thatof freshwater teleosts with a clearly defined seasonal reproductive cycle. L. cylindricus... -
Infection of hottentot Pachymetopon blochii by the fish louse Anilocra capensis (Crustacea: Isopoda) in False Bay, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: R.V. Wright --- Zoology Department and Marine Biology Research Institute, South Africa Y.A.R.G. Lechanteur --- Zoology Department and Marine Biology Research Institute, South Africa K. Prochazka --- Zoology Department and Marine Biology Research Institute, South Africa C.L. Griffiths [AN0001]The frequency of occurrence, location on the host, abundance, and size and sex distributions of ectoparasitic isopods,Anilocra capensis, on hottentot Pachymetopon blochii from False Bay, South Africa, were investigated. A. capensis occurred on 5.2 % of examined hosts and were... -
Pelagic eggs of marine fishes from Park Rynie, KwaZulu-Natal, South Africa: seasonal spawning patterns of the three most common species
Item type: Journal Article • Journal: African Zoology • Authors: A.D. Connell --- Environmentek, South AfricaFor the period 1987 to 1998, pelagic eggs of marine fishes were collected from shelf waters at Park Rynie on the KwaZulu-Natal south coast. The three most numerous eggs collected were those of the mackerel Scomber japonicus,the sardine Sardinops sagax... -
>Utilization of shallow subtidal bays associated with warm temperate rocky shores by the late-stage larvae of some inshore fish species, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Nadine A. Strydom --- South African Institute for Aquatic Biodiversity, South Africa>This work describes the utilization of shallow, subtidal bays, associated with rocky shores, by the late-stage larvae and early juveniles of some common inshore fishes. Larval and early juvenile fishes were collected in seven small bays (30–50 m wide) between... -
“We are all children of God”: a Charismatic church as space of encounter between township and suburb in post-apartheid Johannesburg
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Barbara Heer --- Institute of Social Anthropology, SwitzerlandTwenty years after the first democratic election in South Africa, Johannesburg is still marked by the legacy of apartheid. This makes it difficult for residents of former townships and of suburban middle classes to interact in everyday life. Nevertheless, urban... -
Resource partitioning in two coexisting cladocerans, Daphnia magna and Scapheloberis kingi (Anomopoda: Daphniidae), in north-eastern Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Chakri --- Laboratoire de Recherche et de Conservation des Zones Humides, Algeria B Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, AlgeriaLife-history traits of two coexisting cladocerans, Daphnia magna Straus and Scapheloberis kingi Sars, inhabiting a temporary pond in north-eastern Algeria were monitored in 2013 under laboratory conditions. Their life histories were compared for differences in traits such as age and... -
An assessment of the reproductive biology of the Marico barb Barbus motebensis from the upper Groot Marico catchment, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Kindler --- Department of Zoology, South Africa GM Wagenaar --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa OLF Weyl --- Centre for Invasion Biology, SAIAB, South AfricaBarbus motebensis is endemic to the Groot Marico River catchment in the North West province, South Africa, and is considered of particular conservation importance due to being Red-Listed as Vulnerable. Due to its vulnerable conservation status, the aim of this... -
Space radiation environment of ALSAT-2 and its degradation effect on InGaP/InGaAs/Ge solar cells
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Nadjima Benkara Mohammed --- Department of Sciences and Techniques, Faculty of Sciences and Technology, Algeria Souaad Benkara Mahammed --- Department of Electrical and Computer Engineering, Faculty of Engineering, MalaysiaSurrounding the earth, and throughout outer space, significant levels of radiation particles exist. These particles include protons, electrons, heavy ions, and other forms of radiation. Different regions are known to contain different amounts of various types of particles with different... -
Effect of organic cultivation of rooibos tea plants (Aspalathus linearis) on soil nutrient status in Nieuwoudtville, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Samson BM Chimphango --- Department of Biological Sciences, South Africa Dawood Hattas --- Department of Biological Sciences, South Africa Noel Oettlé --- Rural Programme, South AfricaThe shoots of rooibos (Aspalathus linearis (Burm.f.) R.Dahlgren) plants, cultivated organically by small-scale farmers in Nieuwoudtville, are harvested for the production of tea. These practices could lead to decreasing soil fertility. It was hypothesised that soil from cultivated rooibos plots... -
Distribution and ecological risks of polychlorinated biphenyls (PCBs) in surface sediment of the Forcados River, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CMA Iwegbue --- Department of Chemistry, NigeriaConcentrations of Σ15 PCBs in sediments of the Forcados River, Nigeria, were determined in 2012 to provide information on the profile, sources and ecotoxicological risks of PCBs in the sediment. The screening concentrations of PCBs were quantified using a gas... -
(Dis)empowered whiteness: un-whitely spaces and the production of the good white home
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Christi Kruger --- Wits Institute for Social and Economic Research, South AfricaThis paper draws on ethnographic fieldwork in a white informal settlement in South Africa, to explore the ways in which poorer whites with perceived notions of whiteness and blackness negotiate living in informal settlements. In doing this, I argue, they... -
Spatial characterisation of the Benguela ecosystem for ecosystem-based management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa L Blamey --- Marine Research Institute, South Africa T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa JG Field --- Marine Research Institute, South Africa G Bianchi --- Food and Agriculture Organization, Italy JA Huggett --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa L Hutchings --- Marine Research Institute, South Africa J Jackson-Veitch --- Marine Research Institute, South Africa A Jarre --- Marine Research Institute, South Africa C Lett --- Institut de Recherche pour le Développement [IRD], UMR MARBEC 248, France MR Lipiński --- Department of Ichthyology and Fisheries Science, South Africa SW Mafwila --- Department of Fisheries and Aquatic Sciences, Namibia MC Pfaff --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa T Samaai --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa LJ Shannon --- Marine Research Institute, South Africa Y-J Shin --- Marine Research Institute, South Africa CD van der Lingen --- Marine Research Institute, South Africa D Yemane --- Marine Research Institute, South AfricaThe three countries of the Benguela Current Large Marine Ecosystem (BCLME), namely Angola, Namibia and South Africa, have committed to implementing ecosystem-based management (EBM) including an ecosystem approach to fisheries (EAF) in the region, to put in practice the principles... -
Lymphovascular space invasion in early-stage endometrial cancer: adjuvant treatment and patterns of recurrence
Item type: Journal Article • Journal: Southern African Journal of Gynaecological Oncology • Authors: Esther van Barneveld --- Department of Obstetrics and Gynaecology, The Netherlands David G Allen --- Department of Obstetrics and Gynaecology, Australia Ruud LM Bekkers --- Department of Obstetrics and Gynaecology, The Netherlands Peter T Grant --- Department of Obstetrics and Gynaecology, AustraliaBackground: In early-stage endometrial cancer, lymphovascular space invasion (LVSI) is an independent predictor of relapse of disease and poorer survival. Nevertheless, adjuvant treatment for LVSI-positive patients is variable. -
Influence of the annual flood-pulse on catch per unit effort, condition and reproduction of Clarias gariepinus from the upper Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Bokhutlo --- Department of Biology and Biotechnological Sciences, Botswana OLF Weyl --- South African Institute for Aquatic Biodiversity, South Africa K Mosepele --- Okavango Research Institute (University of Botswana), Botswana GG Wilson --- Ecosystem Management, School of Environmental and Rural Science, AustraliaCatch per unit effort (CPUE), length, weight and maturity data for Clarias gariepinus were collected during monthly gillnet surveys in the upper Okavango Delta between 2001 and 2009 to investigate their relationship with the annual flood-pulse. CPUE, condition factor (K)... -
Variation of physico-chemical parameters along a river transect through the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Gondwe --- University of Botswana, Okavango Research Institute, Botswana WRL Masamba --- University of Botswana, Okavango Research Institute, BotswanaThe Okavango Delta depends on water quantity and quality to sustain its ecosystem services. Whereas many studies have been carried out on its hydrology, few have been done on water quality in the delta. Water pH, electrical conductivity (EC), dissolved... -
On Order Bounded Subsets of Locally Solid Riesz Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Liang Hong --- , , USAIn a topological Riesz space there are two types of bounded subsets: order bounded subsets and topologically bounded subsets. It is natural to ask (1) whether an order bounded subset is topologically bounded and (2) whether a topologically bounded subset... -
A study concerning splitting and jointly continuous topologies on C(Y,Z)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dimitris Georgiou --- , , Greece Athanasios Megaritis --- , , Greece Kyriakos Papadopoulos --- , , Kuwait Vasilios Petropoulos --- , , GreeceLet Y and Z be two fixed topological spaces and C(Y, Z) the set of all continuous maps from Y into Z. We construct and study topologies on C(Y, Z) that we call F n(τn)-family-open topologies. Furthermore, we find... -
α-Baer rings and some related concepts via C(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A.R. Aliabad --- , , Iran A. Taherifar --- , , Iran N. Tayarzadeh --- , , IranWe call a commutative ring R an F IN -ring (resp., F SA-ring) if for any two finitely generated I, J ⊴R we have Ann(I)+Ann(J )=Ann(I∩J ) (resp., there is K ⊴ R such that Ann(I)+Ann(J )=Ann(K)). Moreover, we extend... -
Spatial patterns of encroaching shrub species under different grazing regimes in a semi-arid savanna, eastern Karoo, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Admore Mureva --- School of Life Sciences, South Africa David Ward --- School of Life Sciences, South AfricaWoody plant encroachment is increasing in arid and semi-arid regions of the world. We investigated the structure and fine-scale spatial pattern of encroaching species and how these patterns vary with different grazing regimes in semi-arid regions. In this study, we... -
Strengthening HIV surveillance: measurements to track the epidemic in real time
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Usangiphile E Buthelezi --- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson R Mandela School of Medicine, South Africa Candace L Davidson --- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson R Mandela School of Medicine, South Africa Ayesha BM Kharsany --- Centre for the AIDS Programme of Research in South Africa (CAPRISA), Nelson R Mandela School of Medicine, South AfricaSurveillance for HIV as a public health initiative requires timely, detailed and robust data to systematically understand burden of infection, transmission patterns, direct prevention efforts, guide funding, identify new infections and predict future trends in the epidemic. The methods for... -
Is the incremental transparency necessary?
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Chiou-Fa Lin --- Department of Finance, Ya-Wen Lai --- Department of Finance, Mei-Ling Tang --- Department of Finance,This paper examines how liquidity, price discovery and the causality between them are affected by incremental transparency on the Taiwan Stock Exchange (TSEC). We find that it has small effects on market quality, with the impact being focused on small-... -
Local habitat drivers of macrobenthos in the northern, central and southern KwaZulu-Natal Bight, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CF MacKay --- Oceanographic Research Institute, South Africa CB Untiedt --- Oceanographic Research Institute, South Africa L Hein --- Oceanographic Research Institute, South AfricaThe relatively wide KwaZulu-Natal Bight between St Lucia and Durban on the north-east shelf of South Africa is characterised by several circulation features driven by the Agulhas Current, wind and coastal inputs. A large multidisciplinary programme investigated the sources and... -
Constraints to public sphere activity in Joubert Park, Johannesburg
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Ingrid E. Marais --- Department of Anthropology and Archaeology, South AfricaThe link between public sphere and public space has long been established within the literature. Using three aspects of public sphere — plurality, public space and deliberate talk — I argue that the management choices that the City of Johannesburg... -
Metropolitan nomads: a journey through Jo’burg’s “little Mogadishu”
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Nereida Ripero-Muñiz --- Modern Languages, School of Literature, Language and Media, South Africa Salym Fayad --- , South AfricaMayfair, a Johannesburg suburb, is a place where the lives of hundreds of Somalis intersect: a space of opportunity for some, a place of refuge for others, and a home away from home for the Somali diaspora in the city... -
Identification and molecular characterisation of Colletotrichum species from avocado, citrus and pawpaw in Ghana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Joseph O Honger --- Soil and Irrigation Research Centre, School of Agriculture, College of Basic and Applied Sciences, Ghana Samuel K Offei --- Biotechnology Centre, College of Basic and Applied Sciences, Ghana Kwadwo A Oduro --- Department of Crop Science, School of Agriculture, College of Basic and Applied Sciences, Ghana George T Odamtten --- Botany Department, College of Basic and Applied Sciences, Ghana Seloame T Nyaku --- Department of Crop Science, School of Agriculture, College of Basic and Applied Sciences, GhanaOwing to previous identifications based solely on morphological characteristics, the identity of the causal agents of anthracnose disease of pawpaw and avocado in Ghana is in doubt. In addition, the pathogen has not been identified previously on citrus. In this... -
Dark times for dageraad Chrysoblephus cristiceps: evidence for stock collapse
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Department of Biological Sciences, South Africa H Winker --- South African National Biodiversity Institute, South Africa CG Attwood --- Department of Biological Sciences, South Africa SE Kerwath --- Department of Biological Sciences, South AfricaThe declaration of a state of emergency in the South African linefishery in 2000 has had a positive impact on a few overexploited endemic seabreams (Family Sparidae). However, the population of the reef-dwelling dageraad Chrysoblephus cristiceps has been unresponsive to... -
Exploring the spatial distribution patterns of South African Cape hakes using generalised additive models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Grüss --- Institut de Recherche pour le Développement [IRD], France D Yemane --- Branch: Fisheries Management, South Africa TP Fairweather --- Branch: Fisheries Management, South AfricaWe developed delta generalised additive models (GAMs) to predict the spatial distribution of different size classes of South African hakes, Merluccius capensis and M. paradoxus, using demersal trawl survey data and geographical (latitude and longitude) and environmental features (depth, temperature,... -
Absence of an effect of freshwater input on the stable isotope and fatty acid signatures of intertidal filter-feeders
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Puccinelli --- Department of Zoology and Entomology, South Africa CD McQuaid --- Department of Zoology and Entomology, South Africa M Noyon --- Department of Zoology and Entomology, South AfricaFreshwater input is known to have the potential to influence marine pelagic and benthic communities through the export of nutrients, sediments and detritus. The increase in nutrients of riverine origin in coastal environments can enhance primary production in coastal areas,... -
Aspects of reproduction of the brown mussel Perna perna at the Iture rocky beach near Cape Coast, Ghana
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EA Krampah --- Department of Fisheries and Aquatic Sciences, Ghana K Yankson --- Department of Fisheries and Aquatic Sciences, Ghana J Blay --- Department of Fisheries and Aquatic Sciences, GhanaAspects of the reproductive biology of the brown mussel Perna perna at the Iture rocky beach near Cape Coast, Ghana, were studied from September 2014 to August 2015. The current study was aimed at providing information useful for managing the... -
Effects of marine reserves on the reproductive biology and recruitment rates of commonly and rarely exploited limpets
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MDV Nakin --- Biological and Environmental Sciences Department, South Africa CD McQuaid --- Coastal Research Group, Department of Zoology and Entomology, South AfricaWe tested the effects of marine reserve status on the reproductive biology and recruitment rates of two commonly exploited (Helcion concolor, Scutellastra longicosta) and two rarely exploited (Cellana capensis, Scutellastra granularis) limpet species using two reserve and two non-reserve sites... -
Can a luxury hotel compete without a spa facility?—Opinions from senior managers of London's luxury hotels
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Andy Heyes --- Hospitality Management, University of Derby, United Kingdom Colin Beard --- Sheffield Business School, Sheffield Hallam University, United Kingdom Sjoerd Gehrels --- Academy of International Hospitality Research, Stenden University of Applied Sciences, The NetherlandsThe development of the wellness facility within the luxury hotel sector around the world has been evident, with many professionals believing that spas are an expected element within luxury hotels. This paper has been written to provide further consideration for... -
On the group of self-homotopy equivalences of an almost formal space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mahmoud Benkhalifa --- University of Sharjah, UAEA simply connected CW-complex X of finite type is called almost formal if and if the rational Hurewicz homomorphism is injective for every n ≥ 1. In this paper, we show that the group of self-homotopy equivalences of an almost... -
Tax transparency reporting by the top 50 JSE-listed firms
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Madeleine Stiglingh --- Department of Accounting, South Africa Elmar R. Venter --- Department of Accounting, South Africa Ilinza Penning --- Department of Taxation, South Africa Anna-Retha Smit --- Department of Taxation, South Africa Anculien Schoeman --- Department of Taxation, South Africa Theuns L. Steyn --- Department of Taxation, South AfricaAs a result of increased regulatory focus on a number of firms’ tax behaviour, tax compliance is now recognised as a source of reputational risk. Transparency on the reporting of tax related matters in public corporate reports could mitigate a... -
Spatial behaviour and food choice of the Garden Warbler Sylvia borin during the non-breeding season
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Soladoye B Iwajomo --- Department of Zoology, Faculty of Science, Nigeria Ulf Ottosson --- Centre for Macroecology Evolution and Climate, Natural History Museum of Denmark, Denmark Kasper Thorup --- Centre for Macroecology Evolution and Climate, Natural History Museum of Denmark, DenmarkInformation regarding the spatial behaviour of migratory bird species on their wintering ground is important in understanding the factors that can influence breeding success and population size. The Garden Warbler Sylvia borin is a migratory species that has been well... -
Adolescent identities in the cyberworld
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Petro van der Merwe --- Department of Psychology, South AfricaThe main aim of this study was to understand how adolescents express their identities in virtual worlds. Fifty-nine South African high school learners (females = 51%) completed an interview and survey regarding their online interactions important for their personal identities... -
“What else can we do?” Strategies and negotiations around place and space in the case of “undocumented” Zimbabwean migrant workers in Botswana
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Treasa Galvin --- Department of Sociology, BotswanaRestrictive immigration laws, enhanced border controls, the criminalisation of migrants, punitive deportation practices and a lack of respect for the right to asylum have become a common feature of the contemporary world. In the face of these increasingly restrictive state... -
Genetic stock structure of white steenbras Lithognathus lithognathus (Cuvier, 1829), an overexploited fishery species in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RH Bennett --- South African Institute for Aquatic Biodiversity, South Africa K Reid --- Molecular Ecology and Evolution Programme, Department of Genetics, South Africa G Gouws --- South African Institute for Aquatic Biodiversity, South Africa P Bloomer --- Molecular Ecology and Evolution Programme, Department of Genetics, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity, South AfricaWhite steenbras Lithognathus lithognathus (Teleostei: Sparidae) is an overexploited marine fish species endemic to South Africa. Overexploitation in recreational, subsistence and commercial fisheries has resulted in stock collapse and the need for improved management of the species. Adults are thought... -
Long-term trends in cetacean occurrence during the annual sardine run off the Wild Coast, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Caputo --- Department of Zoology and Entomology, South Africa PW Froneman --- Department of Zoology and Entomology, South Africa D du Preez --- School of Environmental Sciences, South Africa G Thompson --- KwaZulu-Natal Sharks Board, South Africa S Plön --- School of Environmental Sciences, South AfricaDuring the austral winter, cetaceans and other apex predators follow the annual northeastward movement of shoaling sardines, known as the sardine run, along the southeast coast of South Africa, including a 400-km stretch called the Wild Coast. In total, 131... -
Spatial patterns and determinants of fertility levels among women of childbearing age in Nigeria
Item type: Journal Article • Journal: South African Family Practice • Authors: Oluwayemisi O Alaba --- Department of Statistics, Nigeria Olusanya E Olubusoye --- Department of Statistics, South Africa JO Olaomi --- Department of Statistics, South AfricaBackground: Despite aggressive measures to control the population in Nigeria, the population of Nigeria still remains worrisome. Increased birth rates have significantly contributed to Nigeria being referred to as the most populous country in Africa. This study analyses spatial patterns... -
A review of interprovincial variations in HIV prevalence rates in Zimbabwe
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Elisa Sibanda --- Department of Development Studies, South Africa Prudence Khumalo --- Department of Public Administration, South AfricaDespite the proven remarkable decline of HIV prevalence in the sub-Saharan Africa region, both sub-regional and within-country disparities in HIV prevalence persist. This paper is a survey of literature on HIV prevalence and spread in Zimbabwe, focusing on provincial differences... -
When plenty is not enough: an assessment of the white stumpnose (Rhabdosargus globiceps) fishery of Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Fisheries Management Branch, Department of Agriculture, South Africa SE Kerwath --- Fisheries Management Branch, Department of Agriculture, South Africa TF Næsje --- Norwegian Institute for Nature Research (NINA), Norway CJ Arendse --- South African National Parks, Rondevlei Scientific Services (Garden Route National Park), South Africa FJ Keulder-Stenevik --- Sars Centre for Marine Molecular Biology, Norway K Hutchings --- Anchor Environmental Consultants, South Africa BM Clark --- Anchor Environmental Consultants, South Africa H Winker --- Fisheries Management Branch, Department of Agriculture, South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa CG Attwood --- Department of Biological Sciences, South AfricaWhite stumpnose Rhabdosargus globiceps is the main target of the linefishery in Saldanha Bay. Increased fishing pressure over the last three decades, particularly by the recreational sector, has led to concerns regarding sustainability of the local white stumpnose stock. The... -
Analysis of bycatch in the South African midwater trawl fishery for horse mackerel Trachurus capensis based on observer data
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JR Reed --- Marine Research Institute, Department of Biological Sciences, South Africa SE Kerwath --- Marine Research Institute, Department of Biological Sciences, South Africa CG Attwood --- Marine Research Institute, Department of Biological Sciences, South AfricaThe South African midwater trawl fishery targets adult horse mackerel Trachurus capensis. The bulk of the catch is taken by a single freezer-trawler, the biggest fishing vessel operating in South African waters. As fishing takes place off the south coast... -
Phylogeography of oribi antelope in South Africa: evolutionary versus anthropogenic panmixia
Item type: Journal Article • Journal: African Zoology • Authors: Bettine Jansen van Vuuren --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa Ian Rushworth --- Ecological Advice Division, Scientific Services, South Africa Claudine Montgelard --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South AfricaThe increased rate of human-driven change is a major threat to biodiversity. Although there is sufficient evidence to suggest that species notably alter their ranges, facilitation of such movement for larger vertebrate species often places burdens on management agencies. Oribi... -
Reflection on the first five years of South Africa’s Acoustic Tracking Array Platform (ATAP): status, challenges and opportunities
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RH Bennett --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe Acoustic Tracking Array Platform (ATAP) is a marine science programme that monitors the movements and migrations of inshore marine animals along the South African coastline. Acoustically tagged animals are monitored by an expanded network of approximately 100 automated data-logging... -
A first-approximation simple dynamic growth model for forest teak plantations in Gujarat state of India
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vindhya Prasad Tewari --- Himalayan Forest Research Institute, India Bilas Singh --- Arid Forest Research Institute, IndiaTectona grandis (teak) is one of the most important tropical timber species occurring naturally in India. In India, teak is the single most important commercial timber species. Scientifically sound growth models, based on advanced modelling techniques, are often not available,... -
Classification of marine bioregions on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T-C Livingstone --- Ezemvelo KZN Wildlife, South Africa JM Harris --- Ezemvelo KZN Wildlife, South Africa AT Lombard --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa AJ Smit --- Department of Biodiversity and Conservation Biology, South Africa DS Schoeman --- School of Science and Engineering, AustraliaMarine bioregional planning requires a meaningful classification and spatial delineation of the ocean environment using biological and physical characteristics. The relative inaccessibility of much of the ocean and the paucity of directly measured data spanning entire planning regions mean that... -
Spatio-seasonal dynamics of bacteria and metal composition of a platinum mine tailings dam, Rustenburg, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Molemi E Rauwane --- Agricultural Research Council–Biotechnology Platform, South Africa Laurette M Marais --- Department of Biotechnology, Faculty of Applied and Computer Sciences, Vanderbijlpark Campus, South Africa Oluwatosin G Oladipo --- Unit for Environmental Sciences and Management, South Africa Cornelius C Bezuidenhout --- Unit for Environmental Sciences and Management, South Africa Mark S Maboeta --- Unit for Environmental Sciences and Management, South AfricaSeasonal variations and proximity to polluted sites, among other factors, play a vital role in soil composition. The impact of spatio-seasonal changes on bacterial and heavy metal content on and around the platinum mine tailings dam, Rustenburg, South Africa, was... -
Sawn-timber and kraft pulp properties of Pinus elliottii × Pinus caribaea var. hondurensis and Pinus patula × Pinus tecunumanii hybrids and their parental species
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: André Nel --- Shaw Research Centre, Sappi Forests Research, South Africa Francois S Malan --- Retired, South Africa Ron Braunstein --- Sappi Technology Centre, South Africa C Brand Wessels --- Department of Forest and Wood Science, South Africa Arnulf Kanzler --- Shaw Research Centre, Sappi Forests Research, South AfricaA study was undertaken to evaluate the quality of the timber produced by Pinus elliottii × Pinus caribaea var. hondurensis (PECH) and the Pinus patula × Pinus tecunumanii low elevation (PPTL) and high elevation (PPTH) hybrids and their parent species... -
Literacy programs efficacy for developing children’s early reading skills in familiar language in Zambia
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Francis K. Sampa --- Read To Succeed, Zambia Emma Ojanen --- Department of Psychology, Finland Jari Westerholm --- Research, Niilo Mäki Institute, Finland Ritva Ketonen --- Faculty of Educational Sciences, Finland Heikki Lyytinen --- Department of Psychology, FinlandThis study investigated the comparative efficacy of a phonics-based reading program and a language experience approach based literacy program to develop reading skills among Zambian early childhood school learners. The learners (n = 1 986; Grade 2 level; females =... -
Development of a stand density management diagram for Santalum album plantations in Karnataka, India
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vindhya Prasad Tewari --- Himalayan Forest Research Institute, India Baragur N Diwakara --- Forest Biometry Division, Institute of Wood Science and Technology, IndiaStand density management diagrams are average stand-level models that graphically display the relationship between stand yield, density, height and diameter throughout the various stages of forest development in even-aged stands. These are useful tools for designing, displaying and evaluating alternative... -
The age and growth of hottentot seabream Pachymetopon blochii before and after the South African linefish state of emergency in 2000
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MW Farthing --- Department of Ichthyology and Fisheries Science, South Africa AC Winkler --- Department of Ichthyology and Fisheries Science, South Africa K Anderson --- Department of Ichthyology and Fisheries Science, South Africa S Kerwath --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa C Wilke --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe hottentot seabream Pachymetopon blochii is a small-sized (maximum 2.67 kg) sparid endemic to southern Africa. It is an important target in South Africa's Western Cape traditional linefishery, particularly in the absence of more valuable pelagic species (such as Thyrsites... -
The effect of different anaesthetic mask shapes on the anatomical dead space using infant, child and adult part-task trainers
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: L Botes --- School of Medicine, South Africa J Jacobs --- School of Medicine, South Africa R Rademeyer --- School of Medicine, South Africa S Van der Merwe --- School of Medicine, South Africa L Van Heerden --- School of Medicine, South Africa BJS Diedericks --- Department of Anaesthesiology, South AfricaDead space is the portion of tidal volume that does not participate in alveolar gas exchange. The purpose of this study was to compare the dead space contribution of differently shaped masks, of the same size, by measuring the volume... -
Possible influences of a macroalgal bloom in eelgrass beds on fish assemblages in the lower Knysna Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Pollard --- South African Environmental Observation Network, South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity, South Africa AN Hodgson --- Department of Zoology & Entomology, South AfricaThe occurrence of a macroalgal bloom at eelgrass (Zostera capensis) sampling sites in the summer of 2014/2015 provided an opportunity to use underwater video cameras to monitor the possible effects of environmental change on fish diversity and abundance in the... -
Data-moderate assessments of Cape monkfish Lophius vomerinus and west coast sole Austroglossus microlepis in Namibian waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JN Kathena --- National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources (MFMR), Namibia A Kokkalis --- National Institute of Aquatic Resources (DTU Aqua), Denmark MW Pedersen --- National Institute of Aquatic Resources (DTU Aqua), Denmark JE Beyer --- National Institute of Aquatic Resources (DTU Aqua), Denmark UH Thygesen --- National Institute of Aquatic Resources (DTU Aqua), DenmarkThere is global interest in providing scientific advice on optimal harvesting of all commercially exploited fish stocks. Nevertheless, many commercially important stocks lack analytical assessments. Therefore, we evaluate a data-moderate stock assessment method: the stochastic surplus production model in continuous... -
Extreme significant wave height climate in the Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AA Osinowo --- , Nigeria EC Okogbue --- , Nigeria EO Eresanya --- , Nigeria OS Akande --- , NigeriaThis article investigates spatio-temporal trends for different return periods of extreme significant wave height (SWH) in the Gulf of Guinea (GG), northeastern tropical Atlantic Ocean, based on a 37-year (1980–2016) wave hindcast. High-resolution reanalysis windfield datasets were used to force... -
Life-history traits of seabream Boops boops (Linnaeus, 1758) in the central eastern Atlantic Ocean (Canary Islands)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Massaro --- , Italy JG Pajuelo --- , SpainLife-history traits of the sparid Boops boops are studied for the first time in an isolated Atlantic population. Boops boops is a hermaphrodite species characterised by late gonochorism or non-functional hermaphroditism. The 1:0.852 ratio of females to males was significantly... -
Spatial distribution of male display sites in a North African population of Houbara Bustard Chlamydotis undulata undulata
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Mohsen Chammem --- Institut des Regions Arides, Tunisia Mohsen Jarray --- Institut des Regions Arides, Tunisia Touhami Khorchani --- Institut des Regions Arides, TunisiaUnderstanding the effect of habitat characteristics on the distribution of threatened species are fundamental in conservation planning and management. Here, we explore the spatial distribution pattern of display site by the North African Houbara Bustard Chlamydotis undulata undulata males. For... -
Language as potential space for relational positioning: Exploring language use as a manifestation of leadership anxiety dynamics
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Aden-Paul Flotman --- Department of Industrial and Organisational Psychology, South Africa Michelle S. May --- Department of Industrial and Organisational Psychology, South Africa Frans Cilliers --- Department of Industrial and Organisational Psychology, South AfricaThis exploratory study considered language use as a manifestation of anxiety in work and everyday settings. Respondents were seven psychology practitioners from across the discipline (following a psychodynamic approach), who reflected on the dynamics of language use associated with their... -
Spatial considerations when monitoring reef fishes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Parker --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa H Winker --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa ATF Bernard --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa MKS Smith --- South African National Parks, Rondevlei Scientific Services, South Africa A Götz --- South African Environmental Observation Network (SAEON), South AfricaSpatial dependence can obscure relationships between response and explanatory variables because of structuring within the residuals reducing variance and biasing coefficient estimates. Here, we highlight the influence of the spatial component, in the presence of spatial dependence, on abundance trends... -
Landscape pattern changes over 25 years across a hotspot zone in southern Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Igor José Malfetoni Ferreira --- Remote Sensing Division, Brazil Gabriel da Rocha Bragion --- Remote Sensing Division, Brazil José Hilário Delconte Ferreira --- Biodiversity and Conservation of Nature Department, Brazil Evanilde Benedito --- Center for Research in Limnology, Ichthyology and Aquaculture, Biology Department, Brazil Edivando Vitor do Couto --- Biodiversity and Conservation of Nature Department, BrazilForest fragmentation caused by human activities has many implications for natural landscapes, such as habitat reduction and the loss of biodiversity. This study investigated the temporal fragmentation process of forest remnants in a strongly agro-industrialised region in southern Brazil over... -
Architecture-by-migrants: the porous infrastructures of Bellville
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Huda Tayob --- The Bartlett School of Architecture, United KingdomThis paper takes as its subject a series of contingent mixed-use urban markets that have been established in Cape Town, South Africa, by migrants, refugees and asylum seekers from various parts of the African continent. It argues that migrant spaces... -
Rhythm and connection on Rissik Street: Reflecting on public space research in inner-city Johannesburg
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Temba John Dawson Middelmann --- Town and Regional Planning, South AfricaThis paper explores how entangled layers of use and contingencies of open spaces in downtown Johannesburg, South Africa, relate to their structural, material and symbolic aspects. Reflecting on research at Pieter Roos Park, Constitution Hill and Gandhi Square, this paper... -
A mathematical formulation of the joint economic and emission dispatch problem of a renewable energy-assisted prosumer microgrid
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Uyikumhe Damisa --- Department of Electrical and Electronic Engineering Science, South Africa Nnamdi I. Nwulu --- Department of Electrical and Electronic Engineering Science, South Africa Yanxia Sun --- Department of Electrical and Electronic Engineering Science, South AfricaOperational planning of prosumer microgrids with solar and wind energy sources is quite a complex task considering the intermittency of these sources and energy import/export from prosumers. Reserve capacities which can be reliably provided by dispatchable sources like conventional generators... -
Tax governance compliance: An exploratory study of the 50 largest Johannesburg Stock Exchange-listed companies
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Cara Thiart --- School of Accountancy, South AfricaIn line with current international sentiment which promotes greater transparency, the King Committee on Corporate Governance in South Africa updated its corporate governance framework through the issue of the King IV Report on Corporate Governance for South Africa, which replaced... -
The Effect of Provenance, Plant Spacing and Cutting Interval on Leaf Biomass Yield of Moringa Oleifera Lam.
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: C. T. Gadzirayi --- Bindura University of Science Education, Zimbabwe F. Kubiku --- Bindura University of Science Education, Zimbabwe J. Mupangwa --- University of Fort Hare, South Africa B. Masamha --- Bindura University of Science Education, Zimbabwe L. Mujuru --- Bindura University of Science Education, ZimbabweTwo provenances of Moringa oleifera Lam., Malawi and Mutoko, were evaluated to determine the effect of plant spacing and cutting interval on the leaf biomass yield for fodder production. A split-split plot experimental design was set up with provenance as... -
Theoretical turns through tourism taste-scapes: the evolution of food tourism research
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Sally Everett --- King’s Business School, United KingdomThis article reflects on the evolution of food tourism research by tracing its conceptual, theoretical and empirical twists and turns over the past few decades. Prompted by some recent systematic reviews of food tourism studies, I draw on literature to... -
Patterns of juvenile reef-fish recruitment in Kenya’s shallow fringing- lagoon reefs
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM Okemwa --- Kenya Marine and Fisheries Research Institute, Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya EN Kimani --- Kenya Marine and Fisheries Research Institute, KenyaStudies to understand local-scale patterns in the recruitment of juvenile coral-reef fishes within the western Indian Ocean (WIO) region are few, yet such knowledge is important in fisheries management. Underwater visual census surveys were conducted at five shallow fringing-lagoon reef... -
Age, growth and per-recruit stock assessment of southern mullet Chelon richardsonii in Saldanha Bay and Langebaan Lagoon, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Horton --- Department of Biological Sciences, South Africa D Parker --- Department of Biological Sciences, South Africa H Winker --- Branch: Fisheries Management, Department of Agriculture, South Africa SJ Lamberth --- Branch: Fisheries Management, Department of Agriculture, South Africa K Hutchings --- Anchor Environmental Consultants, South Africa SE Kerwath --- Department of Biological Sciences, South AfricaThe southern mullet Chelon richardsonii (Mugilidae) is the main target species of the inshore net fishery (gillnet and beach-seine) on the west coast of South Africa. The stock has displayed symptoms of overfishing, with a 28% reduction in the standardised... -
Unravelling the taxonomy and distribution of two problematic small mammal genera in the Karoo biome
Item type: Journal Article • Journal: African Zoology • Authors: Devon Main --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa Laura Tensen --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa Katharina Gihring --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa Gary Bronner --- Department of Biological Sciences, South Africa Nadine Aboul-Hassan --- Institute for Communities and Wildlife in Africa, Department of Biological Sciences, South Africa Michelle Blanckenberg --- Institute for Communities and Wildlife in Africa, Department of Biological Sciences, South Africa Bettine Jansen van Vuuren --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South AfricaSouth Africa harbours remarkable biological diversity with three of the 34 recognised global biodiversity hotspots placed within its borders. One of these is the Succulent Karoo, which together with the Nama-Karoo, forms the Greater Karoo region. Notwithstanding a paucity of... -
Spatial distribution and breeding territories of Bonelli’s Eagle Aquila fasciata in the western Anti-Atlas Mountains, Morocco
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ali Irizi --- Département de Zoologie et Ecologie Animale, Institut Scientifique, Morocco Mohamed Aourir --- Laboratory « Biodiversité et fonctionnement des écosystèmes », Department of Biology, Faculty of Sciences, Morocco Mohammed Znari --- Laboratoire « Biodiversité et Dynamique des Ecosystèmes», Faculté des Sciences – Semlalia, Morocco Mohamed Aziz El Agbani --- Département de Zoologie et Ecologie Animale, Institut Scientifique, Morocco Abdeljebbar Qninba --- Département de Zoologie et Ecologie Animale, Institut Scientifique, MoroccoThe North African population of Bonelli’s Eagle Aquila fasciata (Vieillot, 1822) is limited to the south by the northern fringe of the Sahara Desert. This study provides the first data on the spatial distribution and density of breeding Bonelli’s Eagles... -
Comparing feeding niche, growth characteristics and exploitation level of the giraffe catfish Auchenoglanis occidentalis (Valenciennes, 1775) in the two largest artificial lakes of northern Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Abobi --- Faculty of Biology (FB2), Germany JW Oyiadzo --- Department of Fisheries and Aquatic Resources Management, Ghana M Wolff --- Faculty of Biology (FB2), GermanyThe stomach contents of the giraffe catfish, Auchenoglanis occidentalis, populations from Lake Bontanga and Lake Tono, two artificial lakes, were analysed, together with length frequency data collected from July 2016 to June 2017, to gain knowledge of the stock bioecology... -
Mapping distribution of water hyacinth (Eichhornia crassipes) in Rwanda using multispectral remote sensing imagery
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JA Mukarugwiro --- School of Animal, Plant and Environmental Sciences (APES), South Africa SW Newete --- School of Animal, Plant and Environmental Sciences (APES), South Africa E Adam --- School of Geography, Archaeology and Environmental Studies (GAES), South Africa F Nsanganwimana --- African Center of Excellence for Innovative Teaching & Learning Mathematics & Science, Rwanda KA Abutaleb --- Institute for Soil, Climate and Water, South Africa MJ Byrne --- School of Animal, Plant and Environmental Sciences (APES), South AfricaWater hyacinth, Eichhornia crassipes (C. Mart) Solms (Pontederiaceae), is an invasive aquatic macrophyte with major negative economic and ecological impacts in Rwanda and other East African countries since its establishment in the region in the 1960s. Reliable estimates of water... -
Mechanisms of interference and exploitation competition in a guild of encrusting algae along a South African rocky shore
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Vanmari --- Department of Biodiversity and Conservation Biology, South Africa GW Maneveldt --- Department of Biodiversity and Conservation Biology, South AfricaWithin the marine benthos, space is considered an absolute requirement that is often in limited supply. The often-low availability of this essential resource causes species to interact competitively through mechanisms of interference and exploitation. Species of encrusting algae, in particular,... -
Spatial modelling of cumulative human pressure in the tropical coastscape of Zanzibar, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ZA Khamis --- Department of Geography and Geology, Finland R Kalliola --- Department of Geography and Geology, Finland N Käyhkö --- Department of Geography and Geology, FinlandCoastal landscapes and seascapes (‘coastscapes’) are under immense anthropogenic pressures emanating from multiple human activities. We applied spatial modelling to characterise the cumulative pressures in the coastscape of Zanzibar’s main island Unguja (hereafter Zanzibar), in the western Indian Ocean. We... -
Life history, distribution and seasonal movements of a threatened South African endemic seabream, Chrysoblephus gibbiceps
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CG Attwood --- Department of Biological Sciences and the Marine Research Institute, South Africa ME Dawson --- Department of Biological Sciences and the Marine Research Institute, South Africa SE Kerwath --- Department of Biological Sciences and the Marine Research Institute, South Africa C Wilke --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South AfricaThe red stumpnose Chrysoblephus gibbiceps (Sparidae) is a South African endemic seabream that has been severely depleted by fishing. A total of 678 C. gibbiceps were sampled by line and trawl fishing for a study of their morphology, age, growth,... -
The status and conservation of the Cape Gannet Morus capensis
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Richard B Sherley --- Environment and Sustainability Institute/Centre for Ecology and Conservation, United Kingdom Robert JM Crawford --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Bruce M Dyer --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Jessica Kemper --- African Penguin Conservation Project, Namibia Azwianewi B Makhado --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Makhudu Masotla --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Lorien Pichegru --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Pierre A Pistorius --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Jean-Paul Roux --- Ministry of Fisheries and Marine Resources, Namibia Peter G Ryan --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Desmond Tom --- Ministry of Fisheries and Marine Resources, Namibia Leshia Upfold --- Department of Environment, Forestry and Fisheries (DEFF), South Africa Henning Winker --- Department of Environment, Forestry and Fisheries (DEFF), South AfricaThe Cape Gannet Morus capensis is one of several seabird species endemic to the Benguela upwelling ecosystem (BUS) but whose population has recently decreased, leading to an unfavourable IUCN Red List assessment. Application of ‘JARA’ (‘Just Another Red-List Assessment,’ a... -
Locally high, but regionally low: the impact of the 2014–2016 drought on the trees of semi-arid savannas, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AM Swemmer --- , South AfricaDrought is thought to be a factor limiting the abundance of shrubs and trees in savannas, but this has rarely been tested empirically. The severe drought of 2014–2016 provided an opportunity to document the impact of drought on the mortality... -
Salt marsh elevation and responses to future sea-level rise in the Knysna Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JL Raw --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa T Riddin --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa J Wasserman --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa TWK Lehman --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa TG Bornman --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa JB Adams --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South AfricaSea-level rise is a significant threat to salt marshes. However, these habitats can respond by increasing their relative elevation, or by migrating into adjacent areas. Here we provide the first report on surface elevation change for salt marsh at the... -
Epibiotic assemblages on the pen shell Pinna rudis (Bivalvia, Pinnidae) at Matiota Beach, São Vicente Island, Cabo Verde
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EP Lopes --- Faculty of Engineering and Maritime Sciences, Cabo Verde N Monteiro --- Faculty of Engineering and Maritime Sciences, Cabo Verde AM Santos --- Faculty of Engineering and Maritime Sciences, Cabo VerdeThe rough pen shell Pinna rudis Linnaeus, 1758 (family Pinnidae), a mollusc with an Atlantic–Mediterranean distribution, is able to live in coarse sandy substrates. Considering its shell structure and ecological characteristics, P. rudis can enhance biodiversity by providing a substrate... -
Spatial patterns and environmental risks of ringnet fishing along the Kenyan coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Thoya --- Kenya Marine and Fisheries Research Institute, Kenya S Pérez-Jorge --- Marine and Environmental Sciences Centre (MARE) and Institute of Marine Research (IMAR), Portugal GM Okemwa --- Kenya Marine and Fisheries Research Institute, Kenya H Mwamlavya --- Kenya Marine and Fisheries Research Institute, Kenya A Tuda --- Kenya Wildlife Service, Kenya N Wambiji --- Kenya Marine and Fisheries Research Institute, Kenya JM Maina --- Department of Environmental Sciences, AustraliaRingnet fishing began in the early 20th century and is practised worldwide, mainly to target nearshore pelagic species. The method was introduced to Kenya’s coastal waters by migrant fishers from Tanzania. However, the impacts of this fishing gear remain poorly... -
Reproductive biology of the mackerel scad Decapterus macarellus from Cabo Verde and the implications for its fishery management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MPV Costa --- Instituto Nacional do Desenvolvimento das Pescas [National Institute for Fisheries Development ] (INDP), Cabo Verde DRS Cruz --- Faculty of Sciences of the University of Lisbon, Portugal LS Monteiro --- Federal University of Rio Grande, Brazil KSM Evora --- University of Cabo Verde, Cabo Verde LG Cardoso --- Federal University of Rio Grande, BrazilThe mackerel scad Decapterus macarellus is of great social and economic importance to Cabo Verde citizens; however, in recent years catches have shown an unexplained decline. The harvest is regulated by way of a minimum legal size and a seasonal... -
Mapping subtidal estuarine habitats with a remotely operated underwater vehicle (ROV)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Wasserman --- Botany Department, DST/NRF Research Chair in Shallow Water Ecosystems, South Africa L Claassens --- Department of Zoology and Entomology, South Africa JB Adams --- Botany Department, DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaSubtidal habitats have not yet been accounted for in habitat maps of South African estuaries. In this study, a novel method for mapping subtidal estuarine habitats, using a remotely operated underwater vehicle (ROV) piloted from a boat, was developed and... -
Use of openly available occurrence data to generate biodiversity maps within the South African EEZ
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Yemane --- Department of Environment, Forestry and Fisheries (DEFF), South Africa SP Kirkman --- Department of Environment, Forestry and Fisheries (DEFF), South Africa T Samaai --- Department of Environment, Forestry and Fisheries (DEFF), South AfricaBiodiversity maps are an important component of ecosystem-based management and conservation. In the past, biodiversity maps were largely generated using patchy occurrence data from a range of data sources. Currently, substantial species occurrence data are readily available for large parts... -
Multiscale drivers of hippopotamus distribution in the St Lucia Estuary, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Alexa S Prinsloo --- , South Africa Deena Pillay --- , South Africa M Justin O'Riain --- , South AfricaThis study provides preliminary data on predictors of Hippopotamus amphibius (Linnaeus, 1758; hippo) distribution in St Lucia Estuary, the largest estuarine system in Africa and a key habitat for one of South Africa’s largest hippo populations. We use binary logistic... -
Genetic structure of bloodworm, Arenicola loveni (Annelida; Arenicolidae) suggests risk of local extinction in the face of overexploitation is lower than expected
Item type: Journal Article • Journal: African Zoology • Authors: CA Simon --- , South Africa J Kara --- , South Africa C Naidoo --- , South Africa CA Matthee --- , South AfricaThe bloodworm, Arenicola loveni, is commonly used as bait by fishers and may be vulnerable to local extinction owing to its K-selected life history strategies and overexploitation. Accurate population data that can inform management is, however, outdated, whereas demand for... -
Mapping key browse resources in a heterogeneous agricultural landscape
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Clarice P Mudzengi --- , Zimbabwe Amon Murwira --- , Zimbabwe Fadzai M Zengeya --- , Zimbabwe Tinyiko Halimani --- , Zimbabwe Herve Fritz --- , France Chrispen Murungweni --- , ZimbabweWe investigated application of MaxEnt, a one-class classifier, in mapping the spatial distribution of Colophospermum mopane, Dichrostachys cinerea and Salvadora persica using drainage, elevation, slope, soil and Normalised Difference Vegetation Index as environmental variables. Model performance was evaluated based on... -
Stand structure, regeneration and seed dispersal patterns of Nothofagus glauca (Hualo) in central Chile
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rafael Navarro-Cerrillo --- , España Antonio Cabrera-Ariza --- , Chile Antonio Avaria --- , Chile Guillermo Palacios-Rodríguez --- , España Rómulo Santelices-Moya --- , ChileGrowing interest in functional silviculture is promoting new approaches to the study of seed dispersal and regeneration, two of the key processes that determine the structure and dynamics of plant populations. Nothofagus glauca is an obligate-seeding tree species typical of... -
Diet of albacore Thunnus alalunga from the waters of Mauritius (western Indian Ocean) inferred from stomach contents and fatty acid analysis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Z Dhurmeea --- , Mauritius H Pethybridge --- , Australia EV Romanov --- , Réunion C Appadoo --- , Mauritius N Bodin --- , SeychellesThe diet of albacore Thunnus alalunga from their spawning ground in the waters of Mauritius was investigated. The stomach contents of 249 albacore individuals, caught by industrial longliners and artisanal fishers, was analysed, and the dominant prey taxa were selected... -
Spatio-temporal typology of the physico-chemical parameters of a large North African river: the Moulouya and its main tributaries (Morocco)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Taybi Abdelkhaleq Fouzi --- , Morocco Mabrouki Youness --- , Morocco Legssyer Bouchra --- , Morocco Berrahou Ali --- , MoroccoThe physico-chemical parameters of surface water from the largest Maghrebian river flowing into the Mediterranean Sea, the Moulouya River, show a large variability in space and time, under the influence of natural and anthropogenic phenomena. This study was conducted between... -
Trends in chemical pollution and ecological status of Lake Ziway, Ethiopia: a review focussing on nutrients, metals and pesticides
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LB Merga --- , The Netherlands AA Mengistie --- , Ethiopia JH Faber --- , The Netherlands PJ Van den Brink --- , The NetherlandsAquatic ecosystems contribute to human well-being by delivering ecosystem services, but their protection has been given low priority in Africa. Lake Ziway in the Ethiopian Rift Valley basin provides services including irrigation, drinking water and fish food in the region... -
Trends in shore-based angling effort determined from aerial surveys: a case study from KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa JB Mann-Lang --- , South AfricaUnderstanding the spatiotemporal characteristics of effort is a critical component of managing fisheries. Recreational shore-angling is the largest sector of the linefishery and one of the primary recreational activities undertaken along the coast of KwaZulu-Natal (KZN), South Africa. The aim... -
Time-course of the physiological-stress response in bronze bream Pachymetopon grande following a simulated catch-and-release angling event
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Pringle --- , South Africa A-R Childs --- , South Africa EC Butler --- , South Africa AC Winkler --- , South Africa MI Duncan --- , South Africa C Teta --- , South Africa WM Potts --- , South AfricaCatch-and-release (C&R) angling has increased in popularity through its mandatory and voluntary use in fisheries conservation and management. However, research has shown that fish can experience considerable stress during a C&R event. The physiological response of fishes is typically assessed... -
Extending biodiversity conservation with functional and evolutionary diversity: a case study of South African sparid fishes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Henriques --- , South Africa BQ Mann --- , South Africa ES Nielsen --- , South Africa C Hui --- , South Africa S von der Heyden --- , South AfricaDesigning marine protected area (MPA) networks has relied primarily on species- or habitat-based measures that assess spatial distributions of biodiversity. Molecular and functional data have the potential to unlock information regarding the evolutionary uniqueness and resilience of natural communities, making... -
Are South African linefishes recovering and what makes them prone to overexploitation?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Haupt --- , South Africa H Winker --- , South Africa D Parker --- , South Africa SE Kerwath --- , South AfricaManaging coastal fisheries is challenging as the status of many fish stocks caught in these fisheries remains unknown. In the South African linefishery, regular comprehensive assessments of the status of most linefish stocks are unattainable owing to a scarcity of... -
Maximal and singular operators in the local “complementary” generalized variable exponent Morrey spaces on unbounded sets
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Canay Aykol --- , Turkey Xayyam A. Badalov --- , Azerbaijan Javanshir J. Hasanov --- , AzerbaijanIn this paper we consider local “complementary” generalized Morrey spaces with variable exponent p(x) and a general function ω(r) defining a Morrey-type norm. We prove the boundedness of the Hardy-Littlewood maximal operator and Calderón-Zygmund singular operators with standard kernel in... -
Seasonal habitat utilisation and morphological characteristics of Chamaeleo dilepis on Telperion Nature Reserve, Mpumalanga, South Africa
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Trevor L O’Donoghue --- Applied Behavioural Ecology and Ecosystem Research Unit, Department of Environmental Sciences, University of South Africa, South Africa Kerry Slater --- Applied Behavioural Ecology and Ecosystem Research Unit, Department of Environmental Sciences, University of South Africa, South Africa Leslie R Brown --- Applied Behavioural Ecology and Ecosystem Research Unit, Department of Environmental Sciences, University of South Africa, South AfricaLimited information on the habitat utilisation and seasonal activity of flap-necked chameleons (Chamaeleo dilepis) is available. We investigated habitat utilisation, seasonal distribution, and sexual dimorphism of C. dilepis on Telperion Nature Reserve (a privately protected natural area) in South Africa... -
Are spas and wellness still considered luxurious in today’s world?
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Sophie Thorne --- ,The world of spas has been around for thousands of years. Built as a supplementary service or facility for luxury hotels, it has quickly become a must have for most if not all luxury hotels around the world. Difficulties may... -
Three-dimensional modelling of the circulation in False Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Coleman --- , South Africa GPJ Diedericks --- , South Africa AK Theron --- , South Africa J Lencart e Silva --- , United KingdomFalse Bay is the largest coastal embayment along South Africa’s coastline. Despite notable contributions of various historical observational studies on the circulation within False Bay and the associated physical processes driving these flows, there remains significant uncertainty largely because the... -
Models for predicting slenderness coefficient from stump diameter for Tectona grandis stands in south-western Nigeria
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Onyekachi Chukwu --- , NigeriaIllegal logging has continued to be a major cause of depletion of the tropical forests in developing countries. However, empirical means of estimating the growth characteristics of a removed tree, which will facilitate the conviction of illegal loggers in judicial... -
When the flathead mullet left St Lucia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield --- , South AfricaThe St Lucia estuarine system on the east coast of South Africa is a declared World Heritage Site and Ramsar Site of International Importance. A major ecological feature of St Lucia during the last century was the annual spawning migration... -
Leopard tortoise Stigmochelys pardalis (Bell, 1928) mortality caused by electrified fences in central South Africa and its impact on tortoise demography
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Sharon Holt --- National Museum, South Africa Liora Kolska Horwitz --- The Hebrew University, Israel Beryl Wilson --- McGregor Museum, South Africa Daryl Codron --- University of the Free State, South AfricaThe leopard tortoise (Stigmochelys pardalis) is among the most ubiquitously distributed chelonian species in Africa. As with other chelonians, however, the species’ slow growth rate, coupled with low survivorship of juveniles, make it susceptible to declines under regimes of environmental... -
The first report of Naobranchia cygniformis Hesse, 1863 (Copepoda: Lernaeopodidae) off South Africa, with a redescription of the adult female
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SM Dippenaar --- , South Africa MM Sebone --- , South AfricaNaobranchia cygniformis Hesse, 1863 is one of 21 accepted species of the genus Naobranchia, which is distinguished from other genera in the family Lernaeopodidae by the possession of ribbon-like maxillae. The original description of N. cygniformis lacked detail concerning the... -
The relationship between tax transparency and tax avoidance
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Madeleine Stiglingh --- , South Africa Anna-Retha Smit --- , South Africa Anri Smit --- , South AfricaAll over the world, the tax avoidance practices of large multinational firms have received much media attention over the last few years, which has become a prominent reputational risk for many firms. In addition to the possible reputational risk stemming... -
The effect of the adoption of International Financial Reporting Standards on foreign portfolio investment in Africa
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Matthew Olubayo Omotoso --- , South Africa Daniël Petrus Schutte --- , South Africa Merwe Oberholzer --- , South AfricaThe adoption and implementation of International Financial Reporting Standards (IFRS) are anticipated to enhance the quality and credibility of financial statement in terms of reliability, transparency and comparability. Consequently, it presupposes improving the functioning of the capital market and influence... -
Are Cape Cormorants Phalacrocorax capensis losing the competition? Dietary overlap with commercial fisheries
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: OB Masiko --- , South Africa PG Ryan --- , South Africa CD van der Lingen --- , South Africa L Upfold --- , South Africa S Somhlaba --- , South Africa M Masotla --- , South Africa Y Geja --- , South Africa BM Dyer --- , South Africa RJM Crawford --- , South Africa AB Makhado --- , South AfricaCape Cormorants Phalacrocorax capensis breed in southern Africa’s Benguela upwelling system and in 2013 were listed as Endangered by the IUCN following a population decrease of >50% over their three most recent generations. This decrease was associated with reduced prey... -
The product space, sustainability, and GVC oriented industrial policies: The case of iron and steel in the SACU
Item type: Journal Article • Journal: Africa Journal of Management • Authors: W.G. Bam --- , South Africa K. De Bruyne --- , BelgiumThis paper develops, and then applies, a holistic framework that supports industrial policy decision-making at the global value chain (GVC) level, with the aim of stimulating sustainable development in developing countries. Notwithstanding the importance of economic growth for development, industrial... -
Spawning observations of Pomadasys commersonnii in the marine section of the Knysna estuarine bay, Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- , South Africa A-R Childs --- , South Africa MKS Smith --- , South Africa RM Foster --- , South Africa WM Potts --- , South AfricaKnowledge of the location and timing of spawning events is critical for fisheries management. As is the case for many southern African fishes, the spotted grunter Pomadasys commersonnii was historically thought to reproduce in the coastal waters off KwaZulu-Natal Province... -
The spatial ecology of black-backed jackals (Canis mesomelas) in a protected mountainous grassland area
Item type: Journal Article • Journal: African Zoology • Authors: Alexander Edward Botha --- , South Africa Angela Caren Bruns --- , South Africa Aliza le Roux --- , South AfricaAn animal’s ability to traverse a landscape and utilise available resources is vital for its survival. The movement patterns of an animal provide insight into space use, activity patterns and ecological requirements that are imperative for successful farming and wildlife... -
The making of a makerspace in Ethiopia: A study of legitimacy using Actor-Network Theory
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Lucia Corsini --- Brunel University London,Makerspaces are community-based design and fabrication spaces that enable the development of local solutions. Although the number of makerspaces in Africa is increasing, it is not well understood how these makerspaces deal with legitimacy challenges. This study aims to illuminate... -
Social entrepreneurs’ use of spatial bricolage to create frugal innovation in a divided urban setting
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Susanne Nilsson --- KTH Royal Institute of Technology, Stockholm, Sweden Mikael Samuelsson --- University of Cape Town, South Africa Camille Meyer --- University of Cape Town, South AfricaThis study examines how social entrepreneurs mobilize resources to innovate in divided urban settings. Over a period of two years, we followed four social start-up entrepreneurs in the city of Cape Town, South Africa, characterized by some of the highest... -
Low nitrogen fertiliser rates and stage of maturity influence nitrogen fractionation and in vitro ruminal nitrogen degradability in tropical grasses
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Martin P Hughes --- , Trinidad and Tobago Victor Mlambo --- , South Africa Cicero HO Lallo --- , Trinidad and TobagoThis study evaluated the interactive effects of low rates (0, 25, 50 and 75 kg N ha−1) of nitrogen (N) fertilizer application and stage of maturity on total N, N fractions and in vitro ruminal N degradability in Brachiaria hybrid,... -
Farm-scale digital soil mapping of soil classes in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Trevan Flynn --- , Czech Republic Andrei Rozanov --- , South Africa Freddie Ellis --- , South Africa Willem de Clercq --- , South Africa Cathy Clarke --- , South AfricaThis study involved the evaluation of farm-scale digital soil classification in the Sandspruit catchment of the Western Cape Province, South Africa. The study aimed to evaluate a digital soil mapping (DSM) method, from feature selection, spatial predictions and sample design... -
Determination of foliar nutrient sufficiency ranges in cultivated rooibos tea using the boundary-line approach
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacobus FN Smith --- , South Africa Ailsa G Hardie --- , South AfricaDespite the global importance of rooibos tea (Aspalathus linearis (Burm.f.) R.Dahlgren) as a health-promoting crop, foliar nutrient sufficiency ranges have not yet been determined for commercially cultivated rooibos. Determination of these ranges is critical for assessing plant nutrient status and... -
Spatial and diurnal distribution of carbon monoxide (CO) and its health and environmental implications in selected locations in the Niger Delta Area of Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Iwekumo Ebibofe Agbozu --- Federal University of Petroleum Resources Effurun, Nigeria Osayomwanbor Ebenezer Oghama --- Federal University of Petroleum Resources Effurun, NigeriaEmission of carbon monoxide (CO) poses unprecedented risks in urban environments. Moreover, there has been a growing concern about the incidences of deaths arising from suffocation by CO fumes in Nigeria. Hence, this study attempts to evaluate the spatial and... -
Density effect on growth variables of eucalypt clones in a Nelder wheel experiment
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Franciele Alba da Silva --- , Brazil Sylvio Péllico Netto --- , Brazil Alexandre Behling --- , Brazil Henrique Soares Koehler --- , Brazil Ataídes Marinheski Filho --- , Brazil Cláudio Cerqueira --- , BrazilNelder’s systematic design enables studies of tree plantation spacing in relatively small areas, which is of great interest for forest planning. However, dependence between observations can arise with this method, making it difficult to use classic statistics for evaluating an... -
Correlation of variations in species abundance of Atlantic forests regenerating on abandoned pastures with different environmental and spatial variables
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: João Paulo de Maçaneiro --- , Brazil Laio Zimermann Oliveira --- , Brazil Lauri Amândio Schorn --- , Brazil Franklin Galvão --- , Brazil Guilherme Salgado Grittz --- , Brazil André Luís de Gasper --- , BrazilThe conversion of native forests into pastures is still a common practice in Brazil. Abandoned pastures have great potential for natural regeneration and therefore could play an important role in meeting the enormous demand for forest restoration. Few studies, however,... -
The application of Bayesian networks to evaluate risks from multiple stressors to water quality of freshwater ecosystems
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: V Wepener --- , South Africa GC O’Brien --- , South AfricaIt is difficult to predict and manage the ecological consequences of multiple water quality stressors on our freshwater systems. This is due to the dynamism of the source-stressor-response relationships and multiple factors including lack of data, complex impact pathways and... -
Long-term effects of micro-fine and class A calcitic lime application rates on soil acidity and rooibos tea yields under Clanwilliam field conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacobus FN Smith --- , South Africa Ailsa G Hardie --- , South AfricaPrevious research on the effect of soil liming on rooibos tea growth was limited to short-term greenhouse trials. This is the first long-term field study to investigate the effect of lime application on rooibos tea production. Micro-fine and class A... -
Can I bring my pet? The space for companion animals in hospitality and tourism
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Lucia Tomassini --- NHL Stenden University of Applied Sciences, The NetherlandsCompanion animals play an important role in our lives as pets, as emotional support animals, as guide dogs, or through different forms of pet therapy. The sociological, emotional and physical space that companion animals have been gaining in our lives... -
Universal lines in graphs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Juan Alberto Rodríguez-Velázquez --- Universitat Rovira i Virgili, SpainIn a metric space M = (X, d), a line induced by two distinct points x, x′ ∈ X, denoted by , is the set of points given by -
Some notes on the paper “On best proximity points of interpolative proximal contractions”
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: M. Gabeleh --- Ayatollah Boroujerdi University, Iran J. Markin --- , USAIn a recent paper [I. Altun and A. Tasdemir, On best proximity points of interpolative proximal contractions, Quaestiones Math. (2020), DOI: 10.2989/16073606.2020.1785576] the authors proved two best proximity point theorems for a new class of non-self mappings, called interpolative Reich-Rus-Ćirić... -
Characterizations of maximal z°-ideals of C(X) and real maximal ideals of q(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Z. Arjmandnezhad --- Shahid Chamran University of ahvaz, Iran F. Azarpanah --- Shahid Chamran University of ahvaz, Iran A.A. Hesari --- Shahid Chamran University of ahvaz, Iran A.R. Salehi --- Petroleum University of Technology, IranIn this paper we first give elementwise characterizations of real maximal ideals and maximal z°-ideals of C(X). Next, using this we characterize the real maximal ideals of the classical ring of quotients q(X) of C(X) and also maximal z°-ideals of... -
On the parabolicity of linear Weingarten spacelike submanifolds in the de Sitter space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Railane Antonia --- Universidade Federal da Paraíba, Brazil Henrique F. de Lima --- Universidade Federal de Campina Grande, BrazilIn this paper, we deal with complete linear Weingarten spacelike sub-manifold immersed with parallel normalized mean curvature vector in de Sitter space of index p. Imposing appropriate restrictions on the values of the mean curvature function H, we establish a... -
Curvature properties of metric and semi-symmetric linear connections
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Miloš Z. Petrović --- , Serbia Nenad O. Vesić --- , Serbia Milan Lj. Zlatanović --- , SerbiaConsidering a non-symmetric linear connection and its dual one appear 6 independent curvature tensors [15]. In the present paper we study properties of curvature tensors of semi-symmetric metric connections on a generalized Riemannian manifold. -
Wardowski and Ćirić type fixed point theorems over non-triangular metric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: V. Rakočević --- University of Niš, Serbia K. Roy --- The University of Burdwan, India M. Saha --- The University of Burdwan, IndiaIn this manuscript, we establish a fixed point theorem for F -Suzuki contraction mapping over a non-triangular metric space and also give a discussion as remarks on the non-triangular metric structure. Moreover we introduce non-triangular metric-like space and prove a... -
The African Bird Atlas Project: a description of the project and BirdMap data-collection protocol
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Michael Brooks --- University of Cape Town, South Africa Sanjo Rose --- University of Cape Town, South Africa Res Altwegg --- University of Cape Town, South Africa Alan TK Lee --- University of Cape Town, South Africa Henk Nel --- , South Africa Ulf Ottosson --- A.P. Leventis Ornithological Research Institute, Nigeria Ernst Retief --- , South Africa Chevonne Reynolds --- University of the Witwatersrand, South Africa Peter G Ryan --- University of Cape Town, South Africa Sidney Shema --- , Kenya Talatu Tende --- A.P. Leventis Ornithological Research Institute, Nigeria Les G Underhill --- University of Cape Town, South Africa Robert L Thomson --- University of Cape Town, South AfricaThe African Bird Atlas Project (ABAP) is a citizen-science bird-monitoring programme that relies on a robust, repeatable protocol (BirdMap) and allows insights into the distributions of African birds and their conservation. The protocol involves collecting bird lists within spatial sampling... -
The Laplace transform on the rearrangement of invariant spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: René Erlin Castillo --- Departamento de Matemáticas Universidad Nacional de Colombia, Colombia A. Ricardo Miranda B. --- Departamento de Matemáticas Universidad Nacional de Colombia, Colombia Julio C. Ramos-Fernández --- Universidad Distrital Francisco José de Caldas, ColombiaIn a self contained presentation we study the boundedness of the Laplace transform on the rearrangement invariant Lebesgue Lp -space, we use real analysis techniques provided by convex analysis and the K-method. -
Digital Jordan curves and surfaces with respect to a graph connectedness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Josef Šlapal --- Brno University of Technology, Institute of Mathematics, Czech RepublicWe introduce a graph connectedness induced by a given set of paths of the same length. We focus on the 2-adjacency graph on the digital line ℤ with a certain set of paths of length n for every positive integer... -
Geometries with non-commutative joins and their application to near-vector spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: K-T. Howell --- Stellenbosch University, South Africa J. Rabie --- Stellenbosch University, South AfricaIn this paper we add to the theory of the geometry of near-structures. More specifically, we define a near-linear space, prove some properties and show that by adding some axioms we arrive at a nearaffine space, as defined by André... -
Modelling level, trend and geographical variations in stigma and discrimination against people living with HIV/AIDS in Nigeria
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Samson B Adebayo --- Monitoring and Evaluation Division, Society for Family Health, Richard Fakolade [B0002] Jennifer Anyanti --- Society for Family Health, Bright Ekweremadu --- Society for Family Health, Olaronke Ladipo --- Society for Family Health, Augustine Ankomah --- Applied Population Research, University of Exeter, UKPeople living with HIV and AIDS (PLHA) often face stigma and discrimination. Stigma is a powerful tool for social control and PLHA are to varying degrees stigmatised against. Consequences of stigma and discrimination against PLHA may result in low turn-out... -
Forgetting to take HIV antiretroviral therapy: a qualitative exploration of medication adherence in the third decade of the HIV epidemic in the United States
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: R. Freeman --- , USA M. Gwadz --- New York University Silver School of Social Work, USA K. Francis --- New York University Silver School of Social Work, USA E. Hoffeld --- New York University Silver School of Social Work, USAOptimal adherence to HIV antiretroviral therapy (ART) is challenging, and racial/ethnic disparities in adherence rates are substantial. The most common reason persons living with HIV (PLWH) give for missed ART doses is forgetting. We took a qualitative exploratory approach to... -
Courtship and mating behaviour in the diadem snake, Spalerosophis diadema cliffordi (Colubridae)
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: RobertL. Ball --- Panola College, USA NeilB. Ford --- University of Texas at Tyler, USA -
Foraging behaviour and use of space in the Graceful Crag Lizard, Pseudocordylus capensis: life on large rock surfaces
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: DahnéA. Lanse Van Rensburg --- University of Stellenbosch, South Africa P. Le. Fras N. Mouton --- University of Stellenbosch, South AfricaThe lizard family Cordylidae has been classified as a clade of classical ambush foragers. Two species, Platysaurus broadleyi and Pseudocordylus capensis, however, display much greater movement rates during activity than other cordylids. Whereas the foraging behaviour ofP. broadleyi is now... -
Movement patterns and growth rate of Scotsman Polysteganus praeorbitalis (Sparidae) tagged in the Pondoland Marine Protected Area, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: BQ Mann --- Oceanographic Research Institute, South Africa WN Dalton --- Oceanographic Research Institute, South Africa GL Jordaan --- Oceanographic Research Institute, South Africa R Daly --- Oceanographic Research Institute, South AfricaA tag-recapture study was undertaken on Polysteganus praeorbitalis in the Pondoland Marine Protected Area (PMPA) on the east coast of South Africa. A total of 1 042 fish were tagged over a period of 16 years and 255 individuals (24.5%)... -
Magellan mussels Aulacomya atra from the South African coast show high diversity within populations but a lack of geographic differentiation
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JP Grobler --- University of the Free State, South Africa Z Zhao --- University of the Free State, South Africa JW Jones --- , United States A Kotze --- University of the Free State, South AfricaThe Magellan mussel Aulacomya atra is a bivalve mollusc found along parts of the South African and Namibian coastline. Its numbers were low historically compared with other indigenous species but have decreased further since the 1970s owing to habitat invasion... -
Frame presentations of compact hedgehogs and their properties
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Igor Arrieta --- University of Coimbra, Portugal Javier Gutiérrez García --- University of the Basque Country UPV/EHU, Spain Jorge Picado --- University of Coimbra, PortugalThis paper considers the compact hedgehog as a frame presented by generators and relations, based on the presentation of the frame of extended real numbers. The main focus will be on the point-free version of continuous and semi-continuous functions that... -
Average Hewitt-Stromberg and box dimensions of typical compact metric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Bilel Selmi --- University of Monastir, TunisiaThe main aim of this paper is to study average Hewitt-Stromberg and box dimensions of typical compact metric spaces belonging to the Gromov-Hausdorff space equipped with the Gromov-Hausdorff metric. -
Linear equivalence of (pseudo) compact spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jan Baars --- , Singapore Jan van Mill --- KdV Institute for Mathematics, University of Amsterdam, The Netherlands Vladimir V. Tkachuk --- Universidad Autónoma Metropolitana, MexicoGiven Tychonoff spaces X and Y, Uspenskij proved in [15] that if X is pseudocompact and Cp(X) is uniformly homeomorphic to Cp (Y), then Y is also pseudocompact. In particular, if Cp (X) is linearly homeomorphic to Cp (Y), then... -
Comultiplication structures on the wedge product of spheres
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dae-Woong Lee --- Jeonbuk National University, Republic of Korea Sunyoung Lee --- Jeonbuk National University, Republic of KoreaHomotopy multiplications on H-spaces and homotopy comultiplications on co-H-spaces play an important role in topology for many reasons. They are the duals with each other in the sense of Eckmann and Hilton, and have many kinds of examples to construct... -
More on cardinality bounds involving the weak Lindelöf degree
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Bella --- University of Catania, Italy N. Carlson --- California Lutheran University, USA I. Gotchev --- Central Connecticut State University, USAWe give several new bounds for the cardinality of a Hausdorff topological space X involving the weak Lindelöf degree ωL(X). In particular, we show that if X is extremally disconnected, then |X| ≤ 2 ωL (X)πχ(X)ψ(X), and if X... -
Ekeland, Takahashi and Caristi principles in preordered quasi-metric spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: S. Cobzaş --- Babeş-Bolyai University, RomaniaWe prove versions of Ekeland, Takahashi and Caristi principles in pre-ordered quasi-metric spaces, the equivalence between these principles, as well as their equivalence to some completeness results for the underlying quasi-metric space. These extend the results proved in S. Cobzaş,... -
Boundedness of the Hilbert transform in Lorentz spaces and applications to operator ideals
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: K.S. Tulenov --- Al-Farabi Kazakh National University, KazakhstanIn this paper, it is investigated the optimal range of the classical Hilbert transform in Lorentz spaces of functions and its non-commutative counterparts including a triangular truncation operator in Schatten-Lorentz ideals. Some applications of obtained results to operator Lipschitz functions... -
Some geometric and physical properties of pseudo ψ-conharmonically symmetric manifolds
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Krishnendu De --- Kabi Sukanta Mahavidyalaya, The University of Burdwan, India Uday Chand De --- University of Calcutta, IndiaIn this article, we present a new tensor that generalizes the conharmonic curvature tensor, termed the ψ-conharmonic curvature tensor. In the first part, we derive some fundamental geometrical properties of a pseudo ψ-conharmonically symmetric manifold (briefly, ) and give some... -
Precision agriculture and the prospects of space strategy for food security in Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Lere Amusan --- North West University, South Africa Samuel Oyewole --- North West University, South AfricaPrecision agriculture generally refers to the methods of crop, livestock and fish farming that are meant to eliminate or minimize uncertainty and maximize products with relative accuracy that matches predetermined expectations. Amidst these, the relevance of space assets such as... -
Representation theorems for closed ideals of CB (X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Alireza Olfati --- Yasouj University, IranLet CB (X) be the Banach algebra of all continuous bounded ℂ-valued functions on a completely regular Hausdorff space X equipped with the supremum norm. We provide representation theorems for arbitrary closed ideals of CB (X). Indeed, for a closed... -
On localization of the Menger property
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Nur Alam --- University of Gour Banga, India Debraj Chandra --- University of Gour Banga, IndiaIn this paper we introduce and study the local version of the Menger property, namely locally Menger property (or, locally Menger space). We explore some preservation like properties in this space. We also discuss certain situations where this local property... -
On the categorical behaviour of locales and D-localic maps
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Igor Arrieta --- University of Coimbra, Portugal Javier Gutiérrez García --- University of the Basque Country UPV/EHU, SpainIt was shown by Banaschewski and Pultr that the classical adjunction between Top and Loc restricts to an adjunction between the category Top D of TD -spaces and their continuous maps, and the category Loc D of all locales and... -
It’s a journey … Emerging adult women’s experiences of spiritual identity development during postgraduate psychology studies in South Africa
Item type: Journal Article • Journal: Indo-Pacific Journal of Phenomenology • Authors: Luzelle Naudé --- University of the Free State, South Africa Lara Fick --- University of the Free State, South AfricaThe spiritual identity development of six South African, emerging adult, female, postgraduate psychology students (21 to 22 years old) was explored using reflective writing exercises and individual interviews. Interpretative phenomenological analysis revealed that spiritual identity exploration occurs continuously across the... -
Living locked down – An autoethnographic approach to strategies of adaption to confined living in north Hesse, Germany
Item type: Journal Article • Journal: Indo-Pacific Journal of Phenomenology • Authors: Floris Bernhardt --- University of Kassel, GermanyBased on autoethnographic observations and phenomenological descriptions of everyday life, this article develops a theory about the connection between challenging housing experiences and the lockdown situation during the COVID-19 pandemic in Germany. A special focus is placed on living in... -
The model theory of commutative near-vector spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Karin-Therese Howell --- Stellenbosch University, SA Charlotte Kestner --- Imperial College London, UKIn this paper we study near-vector spaces over a commutative F from a model theoretic point of view. In this context we show regular near-vector spaces are in fact vector spaces. We find that near-vector spaces are not first-order axiomatisable,... -
Inverses and order boundedness of invertible ideal operators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Kazım Özcan --- , Turkey Bahri Turan --- Gazi University, TurkeyIn this paper, we investigate that under which conditions the inverse of an invertible ideal operator becomes an ideal operator. To determine conditions, in the first case, we consider the center of a Riesz space and achieve the solution by... -
Cross-section measures, radii, and Radon curves
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Horst Martini --- University of Technology Chemnitz, Germany Zokhrab Mustafaev --- University of Houston-Clear Lake, USAThe purpose of this paper is to study cross-section measures and their connections to Radon curves in two-dimensional Minkowski spaces. More precisely, we use results on cross-section measures to present, for nomed planes, inner and outer radii of the unit... -
Chernoff’s inequality in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mohamed Amine Ben Amor --- Tunis-El Manar University, Tunisia Amal Omrani --- Tunis-El Manar University, TunisiaIn this work, we will generalize the moment generating function to Riesz spaces. We will derive some of its properties and use it to prove Chernoff’s inequality inn Riesz spaces. -
Almost clean elements in C(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: R. Mohamadian --- Shahid Chamran University of Ahvaz, IranAn element a in a ring R is called almost clean if a can be written as a = r + e, where r is a regular (non zero-divisor) element and e is an idempotent. It is well known that... -
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On the 0-Cauchy completion of a partial b-metric space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Maggie Aphane --- Sefako Makgatho Health Sciences University, South Africa Seithuti Moshokoa --- Tshwane University of Technology, South Africa Fanyana Ncongwane --- Tshwane University of Technology, South AfricaThe purpose of the paper is to extend the 0-Cauchy completion theory of a partial metric space to the context of a partial b-metric space. We will use the associated b-metric space to construct the required completion. -
Limnological features and water-quality changes of two Ethiopian Rift Valley lakes, Lake Abaya and Lake Chamo
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Dagne --- National Fishery and Aquatic Life Research Center, Ethiopia H Tadesse --- National Fishery and Aquatic Life Research Center, Ethiopia K Teshome --- National Fishery and Aquatic Life Research Center, EthiopiaWe conducted a study in Lake Abaya and Lake Chamo, the two largest Ethiopian Rift Valley lakes, between 2016 and 2019, to evaluate their limnological features and infer longer-term changes in some water-quality parameters. Data generated through in situ measurements... -
Universal specialization semilattices
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Paolo Lipparini --- Università di Roma “Tor Vergata”, ItalyA specialization semilattice is a structure which can be embedded into , where X is a topological space, x ⊑ y means x ⊆ Ky, for x, y ⊆ X, and K is closure in X. Specialization semilattices and posets... -
The (E, E)-approximation property for Banach spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ju Myung Kim --- Sejong University, Korea Bentuo Zheng --- The University of Memphis, USAFor a given Banach space E with an 1-unconditional basis, we introduce the (E, E)-approximation property ((E, E)-AP) which is a natural generalization of the classical approximation property (AP) and the (p, p)-AP. It is shown that the AP always... -
A note on J -spaces and relatively connected subsets
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Simo S. Mthethwa --- University of KwaZulu-Natal, South Africa Ali Taherifar --- Yasouj University, IranIn this note we present an investigation of J -spaces and other types of spaces related to J -spaces. We characterise these spaces using the notion of relatively connected subsets. For a completely regular J -space X, we give a... -
A pointfree theory of Pervin spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Célia Borlido --- Centre for Mathematics of the University of Coimbra (CMUC), Portugal Anna Laura Suarez --- Université Nice Sophia Antipolis, FranceWe lay down the foundations for a pointfree theory of Pervin spaces. A Pervin space is a set equipped with a bounded sublattice of its powerset, and it is known that these objects characterize those quasi-uniform spaces that are transitive... -
Twisted sums of c 0(I)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jessú M.F. Castillo --- Universidad de Extremadura, Instituto de Matemáticas Imuex, Spain Alberto Salguero Alarcón --- Universidad de Extremadura, Instituto de Matemáticas Imuex, SpainWe study in this paper a few remarkable properties of twisted sums Z(κ, X) of c 0(κ) and a Banach space X. We first prove a representation theorem for such twisted sums from which we will obtain, among others, the... -
Gender disparity in livelihood diversification among rural households in Osogbo Agricultural Development Programme (ADP) Zone of Osun State, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Olaide K. Akintunde --- , Nigeria Khadijat O. Olanrewaju --- , Nigeria Timothy O. Agboola --- , Nigeria Ahmed O. Busari --- , NigeriaLivelihood diversification is a coping strategy that functions as a cushioning effect owing to dwindling income from agriculture. This study examined the significant differences in income between males and females before and after livelihood diversification. The multi-stage sampling procedure was... -
Spatiotemporal expectations of apparent motion and the effect of attentional control
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Junjie Qiu --- Lingnan Normal University, China Jibo Li --- Lingnan Normal University, ChinaAn experimental investigation was conducted on whether and how temporal expectation influences visual processing in moving objects, while also considering the role of attention control. Data on reaction times were collected as outcome measures from two behavioural experiments. In experiment... -
Mapping fine-scale demersal trawl effort for application in ecosystem assessment and spatial planning
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Currie --- South African National Biodiversity Institute (SANBI), South Africa LR Harris --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa LJ Atkinson --- South African Environmental Observation Network (SAEON), South Africa TP Fairweather --- Fisheries and the Environment (DFFE), South Africa KJ Sink --- South African National Biodiversity Institute (SANBI), South AfricaFine-scale maps of fishing activity are valuable information layers for fisheries management, assessments of biodiversity impacts and marine spatial planning. Our aim was to develop an accurate map of demersal trawling intensity in South Africa and to demonstrate its utility... -
Acoustic telemetry reveals the drivers behind estuary–sea connectivity of an important estuarine-dependent fishery species, Pomadasys commersonnii, in the Breede Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BA Ziko --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TF Næsje --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JD Filmalter --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe spotted grunter Pomadasys commersonnii is an important estuarine-dependent fishery species known to spawn along the east coast (KwaZulu-Natal Province) of South Africa. However, recent evidence suggests that this species also spawns along the southwest coast in the Western Cape... -
Smallness in topology
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jiří Adámek --- Czech Technical University, Czech Republic Miroslav Hušek --- Charles University, Czech Republic Jiří Rosický --- Masaryk University, Czech Republic Walter Tholen --- York University, CanadaQuillen’s notion of small object and the Gabriel-Ulmer notion of finitely presentable or generated object are fundamental in homotopy theory and categorical algebra. Do these notions always lead to rather uninteresting classes of objects in categories of topological spaces, such... -
Supported approach spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E. Colebunders --- Vrije Universiteit Brussel, België R. Lowen --- Universiteit Antwerpen, BelgiëIn this paper we work in the category of approach spaces with contractions [14], the objects of which are sets endowed with a numerical distance between sets and points. Approach spaces are to be considered a simultaneous generalization of both... -
Some concepts of topology and questions in topological algebra
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A.V. Arhangel’skii --- Moscow Pedagogical State University, RussiaThis paper has features of mixed nature. It contains new results, in particular, on semitopological groups. We also pose some problems, introduce new definitions and describe in details certain techniques we need below, providing the proofs of not so well-known... -
The monoidal nature of the Feistel-Toffoli construction
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Hans-E. Porst --- Stellenbosch University, South AfricaThe Feistel-Toffoli construction of a bijective Boolean function out of an arbitrary one, a fundamental tool in reversible computing and in cryptography, has recently been analyzed (see [12]) to be a special instance of the construction of a monoid homomorphism... -
The significance of the contributions of congruences to the theory of connectednesses and disconnectednesses for topological spaces and graphs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Stefan Veldsman --- Nelson Mandela University, South AfricaThis is a survey of some of the consequences of the recently introduced congruences on the theory of connectednesses (radical classes) and disconnectednesses (semisimple classes) of graphs and topological spaces. In particular, it is shown that the connectednesses and disconnectednesses... -
Navigating Interiorised Dissonance: Somali Women’s Identity, Agency and The Language of Apparel in Nadifa Mohamed’s The Orchard of Lost Souls
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: R.J. Lim --- Stellenbosch University, South AfricaNadifa Mohamed wrote The Orchard of Lost Souls with the impetus of foregrounding Somali women’s intimate experiences throughout the social and political upheaval during the prelude to the Somaliland-Somalia civil war. The Somali people’s centuries-cultivated homogeneity through culture and way... -
Spatial variations in STIs among women enrolled in HIV prevention clinical trials in Durban, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Reshmi Dassaye --- South African Medical Research Council, South Africa Handan Wand --- Kirby Institute, University of New South Wales, Australia Tarylee Reddy --- South African Medical Research Council, South Africa Frank Tanser --- University of Lincoln, Lincoln Institute for Health, UK Benn Sartorius --- London School of Hygiene & Tropical Medicine, UK Natashia Morris --- South African Medical Research Council, South Africa Gita Ramjee --- South African Medical Research Council, South AfricaSouth Africa is faced with a high HIV and STI prevalence and incidence, respectively, with pockets of high burden areas driving these diseases. Localised monitoring of the HIV epidemic and STI endemic would enable more effective targeted prevention strategies. We... -
The changing status of important marine fishery species in selected South African estuaries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa BQ Mann --- Rhodes University, South AfricaThis review examines the changing status of 10 estuary-dependent marine fish species in 10 South African estuarine systems, ranging from the Kosi Estuary in the northeast to the Berg Estuary in the southwest. In all of these systems, the selected... -
Equity of the HIV epidemic response in 13 African countries
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Gary Gaumer --- Brandeis University, USA V. S. Senthil Kumar --- Brandeis University, USA William Crown --- Brandeis University, USA Monica Jordan --- Brandeis University, USA Clare Hurley --- Brandeis University, USA Maya Subramanian --- Brandeis University, USA A. K. Nandakumar --- Brandeis University, USAFor over 25 years, new programs to attempt to stem the HIV epidemic have been developed in Africa by country governments as well as external donors. These programs and activities have built and operated facilities, trained clinicians, financed drugs and... -
Call to prayer: the sound of the adhan, heritage and shifting urban identity in Cape Town
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Duane Jethro --- University of Cape Town, South Africa Mahoati Arthur Lehloenya --- University of Johannesburg, South AfricaArchitectural analyses of heritage and the city largely focus on the visual and physical properties of buildings and sites. Traces of intangible, sensuous heritage such as sounds, smells and community-lived experience are often left out. This article critiques this tradition... -
Tactile technologies of the self: connection, hapticscape and self-development narratives in Cape Town’s Afro-Latin dance scene
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Alice Aterianus-Owanga --- Institut d’ethnologie, Université de Neuchâtel, SwitzerlandDrawing on ethnographic research within the salsa, bachata and kizomba (SBK) scene of Cape Town, this article examines the values and narratives of personal development that Cape Town’s adepts of Afro-Latin dance elaborate around the emic notion of “connection.” I... -
Determination of optimal soil pH and nutrient concentrations for cultivated rooibos tea using the boundary line approach
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacobus FN Smith --- Stellenbosch University, South Africa Ailsa G Hardie --- Stellenbosch University, South AfricaOptimal soil pH and nutrient conditions for rooibos cultivation in South Africa have not yet been established as limited field research has been conducted. Soil chemical (0–300 mm) and yield data were collected from 120 commercial rooibos plantations in the main... -
On a comparison between absolute and relative self-adjoint extension schemes
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Noè Angelo Caruso --- Mathematical Institute, Silesian University in Opava, Czech Republic Alessandro Michelangeli --- Prince Mohammad Bin Fahd University, Saudi Arabia Andrea Ottolini --- University of Washington, USAThe problem of connecting the operator parameters that label the same self-adjoint extension of a given symmetric operator, respectively, within the ‘absolute’ von Neumann extension scheme and the ‘relative’ boundary-triplet-induced extension scheme (i.e., a la Kreĭn-Višik-Birman) is discussed, and quantitative... -
Remarks on weak compactness criteria in variable exponent Lebesgue spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Francisco L. Hernández --- Complutense University of Madrid, Spain César Ruiz --- Complutense University of Madrid, Spain Mauro Sanchiz --- Complutense University of Madrid, SpainWe give two weak compactness Andô type criteria in variable exponent Lebesgue spaces Lp (·) (Ω) on infinite measures. This extends some results of [13] given in the case of finite measures. Spaces Lp (·) (Ω) on infinite measures are... -
A Hahn-Jordan decomposition and Riesz-Frechet representation theorem in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Anke Kalauch --- Institut für Analysis, FR Mathematik, TU Dresden, Germany Wenchi Kuo --- University of the Witwatersrand, South Africa Bruce A. Watson --- University of the Witwatersrand, South AfricaWe give a Hahn-Jordan decomposition in Riesz spaces which generalizes that of [B.A. Watson, An Andô-Douglas type theorem in Riesz spaces with a conditional expectation, Positivity, 13 (2009), 543–558] and a Riesz-Frechet representation theorem for the T-strong dual, where T... -
Towards a geometrical equivalence of norms
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Eder Kikianty --- University of Pretoria, South AfricaAngular equivalence of norms, introduced by Kikianty and Sinnamon (2017), is a notion of norm equivalence that is more attuned to the geometry of the norms. For certain geometrical properties and two angularly equivalent norms, it is the case that... -
Stone-Weierstrass approximation revisited
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Anatoly G. Kusraev --- Southern Mathematical Institute of the Vladikavkaz Science Center of the Russian Academy of Sciences, Russia Semën S. Kutateladze --- Sobolev Institute of Mathematics, Siberian Branch of the Russian Academy of Sciences, RussiaThe aim of the present article is to extend the Stone-Weierstrass theorem to functions ranging in a lattice normed space and admitting order rather than topological approximation. We proceed with the machinery of Boolean-valued transfer from lattice normed space to... -
Weak and strong type inequalities for Orlicz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Louis Labuschagne --- , South AfricaWe revisit the generalisation of Calderon’s Transfer Principle as espoused in [7]. This principle is used to generate weak type maximal inequalities for ergodic operators in the setting of σ-compact locally compact Hausdorff groups acting measure-preservingly on σ-finite measure spaces... -
A rigid Riesz space
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A.W. Wickstead --- Queen’s University Belfast, , Northern Ireland, UKWe give an example of an Archimedean Riesz space on which every automorphism is a strictly positive multiple of the identity. -
Generating functions in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Youssef Azouzi --- Tunis-El Manar University, Tunisia Youssef Nasri --- Tunis-El Manar University, TunisiaWe introduce and study the concept of generating function for natural elements in a Dedekind complete Riesz space equipped with a conditional expectation operator. This allows us to study discrete processes in a free-measure setting. In particular we improve a... -
Acoustic assessment of the biomass of aggregated chokka squid Loligo reynaudii on its inshore spawning grounds on the southeast coast of South Africa in the season closed for fishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: I Hampton --- , South Africa MA Soule --- , South Africa J Mwicigi --- , South AfricaRecent attempts to estimate the biomass of chokka squid Loligo reynaudii on the southeast coast of South Africa by acoustic surveys of the inshore jig-fishing area are described. Pilot surveys of aggregations, covering part of the fishing grounds, were conducted... -
Towards a New Poetics of Comedic Performance in Kenya Following COVID-19
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Anne Lanoi Keton --- Maasai Mara University, Kenya Denis Waswa Barasa --- Masinde Muliro University of Science and Technology, KenyaStand-up comedy in Kenya before COVID-19 relied on close proximity between comedians and their audiences. However, COVID-19 disrupted this arrangement and subverted the performance space of ‘traditional theatre.’ This article examines alternative comic spaces embraced by selected Kenyan stand-up comedians... -
Pointwise multipliers between spaces of analytic functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Daniel Girela --- Universidad de Málaga, Spain Noel Merchán --- Universidad de Málaga, SpainA Banach space X of analytic function in , the unit disc in , is said to be admissible if it contains the polynomials and convergence in X implies uniform convergence in compact subsets of . -
Well-posedness of fractional differential equations with finite delay in complex Banach spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Shangquan Bu --- Tsinghua University, China Gang Cai --- Chongqing Normal University, ChinaWe study the well-posedness of the fractional differential equations with finite delay: Dαu(t) + BDβu(t) = Au(t) + Fut + f(t), (0 ≤ t ≤ 2π) on Lebesgue-Bochner spaces and periodic Besov spaces , where A and B are closed... -
On property-(R 1) and relative Chebyshev centers in Banach spaces-II
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Syamantak Das --- Indian Institute of Technology Hyderabad, India Tanmoy Paul --- Indian Institute of Technology Hyderabad, IndiaWe continue to study (strong) property-(R 1) in Banach spaces. As discussed by Pai & Nowroji in [On restricted centers of sets, J. Approx. Theory, 66(2), 170–189 (1991)], this study corresponds to a triplet , where X is a Banach... -
Some curvature properties of perfect fluid spacetimes
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Krishnendu De --- The University of Burdwan, India Uday Chand De --- University of Calcutta, India Ljubica S. Velimirovic --- University of Niš, SerbiaIn this paper we assume that a perfect fluid is the source of the gravitational field while analyzing the solutions to the Einstein field equations. With this new and innovative approach, we investigate some curvature properties of perfect fluid spacetimes... -
On the largest regular subring of C(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Adelzadeh --- Shahid Chamran University of ahvaz, Iran F. Azarpanah --- Shahid Chamran University of ahvaz, Iran R. Mohamadian --- Shahid Chamran University of ahvaz, IranWe call a real-valued function f on a topological space X a locally constant if each point x ∈ X has a neighborhood on which f is constant. The set of all locally constant functions f: X → ℝ is... -
The solution set to the nonlinear operator equation XAX = BX on Hilbert spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Hua Wang --- Inner Mongolia University of Technology, PRC Jingsong Wu --- Inner Mongolia University of Technology, PRCWe present the representation of solution sets of the operator equation XAX = BX on Hilbert spaces by taking advantage of the invariant subspace of B, including solution sets of nonzero solutions, normal solutions and self-adjoint solutions. Moreover, necessary conditions... -
Discrete selectivity, shrinking properties, and disjoint local π-bases
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gary Gruenhage --- Auburn University, U.S.A Vladimir V. Tkachuk --- Universidad Autónoma Metropolitana, MexicoUsing binary function spaces, we give an example of a pseudocompact discretely selective topological group. We show that, under PFA, every compact space of countable tightness has a countable disjoint local π-base at every point. If X is a compact... -
Reproductive biologies of Psammogobius knysnaensis and Caffrogobius gilchristi in a warm-temperate South African estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PM Ndaleni --- Rhodes, University, South Africa NC James --- Rhodes, University, South Africa J South --- South African Institute for Aquatic Biodiversity, South Africa OLF Weyl --- Rhodes, University, South AfricaReproductive biologies (spawning period, length at maturity and fecundity) of the Knysna sand goby Psammogobius knysnaensis and the Prison goby Caffrogobius gilchristi were investigated between September 2018 and August 2019 in the warm-temperate Sundays Estuary, South Africa. The two species... -
Spectrum of the Cesàro-Hardy operator in rearrangement invariant spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Meiram Akhymbek --- Institute of Mathematics and Mathematical Modeling, Kazakhstan Kanat Tulenov --- Institute of Mathematics and Mathematical Modeling, Kazakhstan Gulnur Zaur --- Institute of Mathematics and Mathematical Modeling, KazakhstanIn this paper, we investigate the spectrum of the Cesàro-Hardy operator in rearrangement invariant spaces over a finite interval and a half line, thereby extending Boyd’s and Leibowitz’s results for Lp(1 < p ⩽ 8) spaces. In particular, when our... -
Orbit spaces of free involutions on the product of three spheres
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dimpi --- University of Delhi, India Hemant Kumar Singh --- University of Delhi, IndiaIn this paper, we have determined the orbit spaces of free involutions on a finitistic space having mod 2 cohomology of the product of three spheres . This paper generalizes the results proved by Dotzel et al. [7] for free... -
On the way to Frölicher bornology
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ben Moditi Mahudu --- University of the Witwatersrand, South Africa Mukinayi Hermenegilde Tshilombo --- University of the Witwatersrand, South AfricaIn this work we introduce the concept of bornology on the theory of Frölicher spaces. A canonical bornology, called the functional bornology, is induced from structure functions, and bounded maps under this bornology are determined. Based on the structure of... -
Movement and growth of the spotted gully shark Triakis megalopterus in South African waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- Oceanographic Research Institute (ORI), South Africa GL Jordaan --- Oceanographic Research Institute (ORI), South Africa WN Dalton --- Oceanographic Research Institute (ORI), South Africa R Daly --- Oceanographic Research Institute (ORI), South Africa M Soekoe --- Reel Science Coalition, South Africa WM Potts --- Rhodes University, South Africa MJ Smale --- Zoology Department and Institute for Coastal and Marine Research, Nelson Mandela University, South Africa L Swart --- Fisheries and the Environment (DFFE), South AfricaThe movement and growth of spotted gully sharks Triakis megalopterus (family Triakidae) along the coast of South Africa were investigated using external dart tagging. Of a total of 7 211 sharks tagged, 657 (9.1%) were recaptured over a 37-year period,... -
Fubini’s theorem for a vector-valued Daniell integral
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jacobus J. Grobler --- North-West University, South AfricaWe define the product integral for two Riesz space-valued Daniell integrals and prove Fubini’s theorem establishing the relation between product integrals and iterated integrals. The properties of the Fremlin tensor product of two Archimedean Riesz spaces enable one to do... -
The proper homotopy of Alexandroff spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Tomás Fernández-Bayort --- Instituto Pablo Neruda, Spain Álvaro Luque --- Universidad de Sevilla, Spain Antonio Quintero --- Universidad de Sevilla, SpainThis paper introduces the study of the infinity in the class of Alexandroff spaces by establishing the proper category of locally finite Alexandroff spaces. We observe that the McCord and Clader theorems are available in this setting. The paper can... -
Two-step inertial Tseng’s extragradient method for solving quasimonotone variational inequalities
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: O.T. Mewomo --- University of KwaZulu-Natal, South Africa R.N. Nwokoye --- University of KwaZulu-Natal, South Africa C.C. Okeke --- University of the Witwatersrand, South AfricaWe focus on quasimonotone variational inequality problems with non-Lipschitz operator and combine some operator theory techniques to establish a weak convergent fixed point iterative method to approximate the solution of the presented problems. The convergence analysis assumes very mild conditions... -
Conformally related invariant (α, β)-metrics on homogeneous spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Azar Fatahi --- University of Isfahan, Iran Masoumeh Hosseini --- University of Isfahan, Iran Hamid Reza Salimi Moghaddam --- University of Isfahan, IranIn this paper, we give the flag curvature formula of general (α, β)-metrics of Berwald type. We study conformally related (α, β)-metrics, especially general (α, β)-metrics that are conformally related to invariant (α, β)-metrics. Also, a necessary and sufficient condition... -
On conjugacy of additive actions in the affine Cremona group
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ivan Arzhantsev --- HSE University, RussiaAn additive action on an irreducible algebraic variety X is an effective action with an open orbit of the vector group . Any two additive actions on X are conjugate by a birational automorphism of X. We prove that, if... -
A generalization of Riesz* homomorphisms on order unit spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Florian Boisen --- Institut für Analysis, TU Dresden, Germany Valentin G. Hölker --- Institut für Analysis, TU Dresden, Germany Anke Kalauch --- Institut für Analysis, TU Dresden, Germany Janko Stennder --- Institut für Analysis, TU Dresden, Germany Onno van Gaans --- Leiden University, The NetherlandsRiesz homomorphisms on vector lattices have been generalized to Riesz* homomorphisms on ordered vector spaces by van Haandel using a condition on sets of finitely many elements. Van Haandel attempted to prove that it suffices to take sets of two... -
Subgroups of products of Nagata semitopological groups and related results
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Liang-Xue Peng --- Beijing University of Technology, ChinaIn this article, we introduce notions which are called property (c*) and property (M 3*) for semitopological groups. We show that if G is a regular semitopological group with a q-point, property (c*) and Sm(G) ≤ ω, then G is... -
Some measure-theoretic aspects of fractal functions: invariant measures and function spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Megha Pandey --- , India Tanmoy Som --- , India Saurabh Verma --- , IndiaBarnsley (1986) introduced the concept of fractal interpolation functions (FIFs). Thereafter, numerous theories have been developed concerning FIFs and their properties. In this article, we explore some measure theoretic aspects of FIFs generated by the method given by Barnsley. We... -
Partitioning the sources of sediment organic carbon in South African seagrass meadows
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Bossert --- Stellenbosch University, South Africa S von der Heyden --- Stellenbosch University, South Africa J Colling --- Stellenbosch University, South Africa A Ndhlovu --- Stellenbosch University, South AfricaIn the sediments of seagrass meadows, allochthonous carbon sources can account for 50–90% of sediment organic carbon (SOC), in which non-seagrass carbon is derived from external organic matter advected into the meadow’s sediments or trapped by the seagrass canopy. Identifying... -
‘The Happy Valley’: Temporalized Spatiality in Michael Radford’s White Mischief (1987)
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Boneace Chagara --- Institute for Asian and African Studies, GermanyContemporary times mark a fundamental shift in our sense and experience of the world. The postmodern condition — as remarked by Fredric Jameson (1991) and Jean-Francois Lyotard (1979), among others — calls for new conceptions of lived reality. Nevertheless, profound... -
Serving Hot Tea: Analyzing Narratives of ‘Abroad’ on Glocal Kenyan Twitter/X Spaces
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Caroline Mose --- The Mawazo Institute, KenyaSocial media reconstitutes the idea of ‘abroad’ as a geographical place, shortens the symbolic distance between borders, and renders the local and global into one almost seamless space. This seamlessness is both metaphorical and symbolic, where happenings on the spatial... -
Norm and relative uniform convergence
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Zili Chen --- Southwest Jiaotong University, China Fu Zhang --- Southwest Jiaotong University, ChinaIn this paper, we show that if H is a Dedekind complete normed Riesz space with the local Egoroff property, then H is lattice isomorphic to an ideal of an AM-space if and only if for any order bounded norm... -
Some characterizations of ergodicity in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Youssef Azouzi --- Tunis-El Manar University, Tunisia Marwa Masmoudi --- Tunis-El Manar University, TunisiaIn the recent surge of papers on ergodic theory within Riesz spaces, this article contributes by introducing enhanced characterizations of ergodicity. Our work extends and strengthens prior results of both the authors and Homann, Kuo, and Watson. Specifically, we show... -
Per-recruit analysis and proposed sustainable harvest strategy for rednose labeo Labeo rosae and Mosambique tilapia Oreochromis mossambicus in Flag Boshielo Dam, Olifants River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- University of Limpopo, South Africa HA Hlungwani --- University of Limpopo, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JR Sara --- University of Limpopo, South AfricaInland fisheries development in South Africa has been proposed to improve rural livelihoods and food security. However, inland fisheries are susceptible to collapse through overfishing. Therefore, establishing biological reference points for these fisheries is essential for long-term sustainability. Here, spawner-biomass-per-recruit... -
Space and spatially structured environmental variables account for variation in blackfly and mayfly communities in sub-tropical South African rivers
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PA Ramulifho --- University of South Africa, South Africa SH Foord --- University of Venda, South Africa NA Rivers-Moore --- University of KwaZulu-Natal, South AfricaUsing aquatic invertebrate assemblages for bioassessment of streams and rivers is a fast and cost-effective approach to studying the impact of environmental stressors in aquatic ecosystems. The use of aquatic invertebrates is premised on their predictable responses to environmental stressors... -
Some properties in vector sequence spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ioana Ghenciu --- University of Wisconsin-River Falls, River Falls, USA Roxana Popescu --- University of Pittsburgh, USASome classes of operators T on are characterized in terms of the induced operators Tn on each Xn . We study pseudo weakly compact, limited completely continuous, q-convergent, DP q-convergent, limited q-convergent, weak Dunford-Pettis, weak* Dunford-Pettis, weak q-convergent, weak* q-convergent... -
Socio-ecological change in bait fisheries for the common sandprawn Kraussillichirus kraussi in Durban Harbour, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Chetty --- Oceanographic Research Institute (ORI), South Africa E Steyn --- Oceanographic Research Institute (ORI), South Africa JC Groeneveld --- Oceanographic Research Institute (ORI), South AfricaBait fishing for the common sandprawn Kraussillichirus kraussi in Durban Harbour, on the east coast of South Africa, has a history going back to the early 20th century and has been influenced by port development and political changes over time... -
Four decades of research on religious tourism: prevalent themes and future research area
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Vaishali Singh --- Tezpur University (Central), India Anjan Bhuyan --- Tezpur University (Central), IndiaThis study aims to review and provide a comprehensive analysis on religious tourism from 1979 to 2024. It conducts a systematic literature review using the SPAR-4-SLR protocol and other bibliometric analytical techniques. Using performance analysis, the study unpacks the research... -
Lebesgue-Fourier algebras on coset spaces and approximate amenability
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Maryam Esfandani --- Isfahan University of Technology, Iran Rasoul Nasr Isfahani --- Isfahan University of Technology, IranLet K be a compact subgroup of a locally compact group G. In this work, we initiate an investigation of the Lebesgue-Fourier algebra S 1 A(G/K) on the coset space G/K with pointwise multiplication; after some general results on the... -
On variants and generalizations of J-frames
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Siyabonga S. Dubazana --- University of KwaZulu-Natal, S.A. Simo S. Mthethwa --- University of KwaZulu-Natal, S.A.A J-frame is a pointfree topology counterpart of the concept of a J-space. In this paper, we present a study of some frames satisfying conditions that are stronger (and some that are weaker) than those defining J-frames. Conditions under which... -
Some remarks on the projective properties of Menger and Hurewicz
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mikołaj Krupski --- Universidad de Murcia, Spain Kacper Kucharski --- Institute of Mathematics, University of Warsaw, PolandIt is known that both the Menger and Hurewicz property of a Tychonoff space X can be described by the way X is placed in its Čech-Stone compactification βX. We provide analogous characterizations for the projective versions of the properties... -
Minisuperspace description for inhomogeneous cosmological models and the role of the Lie symmetries
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Andronikos Paliathanasis --- Institute of Systems Science, Durban University of Technology, South AfricaWe explore the application of Lie symmetries to simplify the gravitational field equations of inhomogeneous cosmology. By employing these symmetries, we demonstrate the construction of a point-like Lagrangian and establish the existence of a minisuperspace description. Finally we show how... -
A survey and exposition of sub-Hausdorff separation axioms
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jeffrey T. Denniston --- Kent State University, USA Austin Melton --- Kent State University, USA Stephen E. Rodabaugh --- Institute for Applied Topology and Topological Structures, Youngstown State University, USA Jamal K. Tartir --- Institute for Applied Topology and Topological Structures, Youngstown State University, USAThis paper surveys and develops sub-Hausdorff axioms. It augments known relationships involving T 0 (Kolmogorov), S 0 (quasi-sobriety), S 1 (sobriety), T 1 (Fréchet), and T 2 (Hausdorff ) by examining a large suite of sub-Hausdorff axioms. Emphasis is given... -
Local complementation in Banach spaces and its preservation under free constructions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Antonio Avilés --- Universidad de Murcia, Spain Gonzalo Martínez-Cervantes --- Universidad de Murcia, Spain Abraham Rueda Zoca --- Universidad de Granada, SpainIn this work we consider natural generalizations of local complementation in Banach spaces, which include Lipschitz-local complementation. We show that all these notions are indeed equivalent to the classical notion of local complementation of Banach spaces. As an application, we... -
The approximation property for the predual of weighted spaces of holomorphic mappings on Banach spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Deepika Baweja --- , India Jahir Abbas Sardar --- , IndiaIn this paper, we investigate the approximation property for the predual of the weighted space of holomorphic mappings, where is a countable family of weights defined on a balanced open subset U of a Banach space E. We introduce a... -
Harnessing the maker movement as an important tool for the inclusion of racialized/marginalized women into the innovation and creativity paradigm
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Suzanne Nyehita --- Postdoctoral Research Fellow, South African Research Chair: Intellectual Property, Innovation and Development, Department of Commercial Law, University of Cape Town, South AfricaThis article explores how makerspaces in Cape Town contribute to the innovation and creativity of racialized and marginalized women, focusing on the impact of these spaces on their entrepreneurial activities and the role of Intellectual Property (IP). Using a mixed-methods... -
Best approximation theorems via relatively u-continuous and Jaggi nonexpansive mappings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: M. Gabeleh --- Ayatollah Boroujerdi University, Iran R. Gholipour --- Yazd University, Iran H. Mazaheri --- Yazd University, Iran S.P. Moshokoa --- Tshwane University of Technology, South AfricaIn this paper, we introduced a new type of cyclic (noncyclic) mappings, called Jaggi relatively nonexpansive mappings and use to investigate the existence of best proximity points (pairs) in the framework of reflexive (strictly convex) Banach spaces by using a... -
A note on fibers and Vietoris topologies of paratopological groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Yu-Ming Deng --- Beijing University of Technology, China Liang-Xue Peng --- Beijing University of Technology, ChinaIf f: G → Y is an irreducible closed continuous mapping defined on a regular weakly collectionwise normal first-countable meta-Lindelöf locally σ paratopological group G onto a T 1-space Y which has a neighborhood ωω -base at a point y... -
Littoral substrates and nest properties of Coptodon rendalli vary with distance from the shoreline in a tropical impoundment, southeast Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RJ Chateya --- National University of Science and Technology, Zimbabwe HGT Ndagurwa --- National University of Science and Technology, ZimbabweThe change in littoral substrates and Coptodon rendalli nest properties along the inshore–offshore gradient of Mushandike Dam in southeast Zimbabwe, impacted by long-term water-level fluctuations, were studied in March 2016. Substrate and nest properties were measured in four contiguous 25... -
Some characterizations of ω-balanced topological groups with a q-point
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Deng-Bin Chen --- Wuyi University, P.R. China Hai-Hua Lin --- Wuyi University, P.R. China Li-Hong Xie --- Wuyi University, P.R. ChinaIn this paper, we study some characterizations of q-spaces, strict q-spaces and strong q-spaces under ω-balanced topological groups. First we characterize a topological group G to be ω-balanced and a q-space whenever for each open neighborhood O of the identity... -
On a variant of extremal disconnectedness in locales and spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Themba Dube --- University of South Africa, South Africa Ali Taherifar --- Yasouj University, IranWe study a variant of extremal disconnectedness in frames, defined by requiring that any two disjoint open sublocales should be separable by disjoint open sublocales each of which is the interior of some zero-sublocale. In spaces, this notion was recently... -
The D-property of extremely normal spaces and the metrizability of certain compact spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Liang-Xue Peng --- Beijing University of Technology, ChinaIn this article, we show that every extremely normal space is a D-space. We introduce a notion called weakly extremely normal with respect to a weak base for a space X. We show that if a space X is weakly... -
On set-star-C-Menger spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Sumit Singh --- Ramjas College, University of Delhi, University Enclave, IndiaMotivated by the Arhangel’skii [2] “s-Lindelöf cardinal function” and Kočinac, Konca, and Singh [15] set-star covering properties, we introduce the setstar-C-Menger property. A space X is said to have the set-star-C-Menger property if for each nonempty subset A of X... -
Nonlinear maps preserving asymptotic equivalence on B(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Zijie Qin --- Changshu Institute of Technology, P.R. ChinaLet X be an infinite-dimensional complex Banach space. By B(X) we denote the algebra of all bounded linear operators on X. It is shown that if Φ : B(X) → B(X) is a surjective map satisfying A + B is... -
Functionally countable subspaces of nice products
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Vladimir V. Tkachuk --- Universidad Autónoma Metropolitana, MéxicoWe establish that, for any Tychonoff space X of weight ≤ ω 1, if Xδ is the Gδ -modification of X , then Cp (Xδ ) has a dense functionally countable subspace. Furthermore, the space has a dense functionally countable... -
A note on the construction of non-spatial frames
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Abolghasem Karimi Feizabadi --- Islamic Azad University, Iran Mahmoud Manafi --- Berlin College of Business and Technology (BCBT), Germany Inderasan Naidoo --- University of South Africa (UNISA), South AfricaWe introduce a new type of ideal, which we term a ζ-ideal (zeta-ideal), on a topological space. We present examples of ζ-ideals and study their properties. ζ-Ideals are shown to provide a new paradigm for constructing non-spatial frames. Beyond that,... -
Spatial and temporal distribution of shallow-water hake Merluccius capensis off the south coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LCJ Nomxego --- Fisheries and the Environment (DFFE), South Africa OS Kjesbu --- Institute of Marine Research, Norway WHH Sauer --- Rhodes University, South Africa MR Lipinski --- Rhodes University, South AfricaThis study investigated the spatial and temporal distribution of shallow-water hake Merluccius capensis off the south coast of South Africa, using 1 807 females collected by bottom trawling during industry and research surveys between 2014 and 2016. Mean body size... -
New properties of some classes of Saphar type operators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ayoub Ghorbel --- University of Sfax, Tunisia Snežana Č. Živković-Zlatanović --- University of Niš, SerbiaThis paper explores additional properties of some classes of Saphar type operators, namely left Drazin invertible, essentially left Drazin invertible, right Drazin invertible, and essentially right Drazin invertible operators on Banach spaces, building upon the groundwork laid in [8] and... -
A closed range integral operator on Hardy spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Fani Papageorgiou --- University of Crete, GreeceIf , then the integral operator is defined as , for and for all . In this paper, we prove necessary and sufficient conditions for the operator Sg to have closed range on Hp for the case 0 < p... -
Vegetation structure and defoliation patterns in heterogeneous grasslands under two herbage allowance levels
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Felipe Casalás --- University of the Republic, Uruguay Nicolas Caram --- University of the Republic, Uruguay Pablo Soca --- University of the Republic, Uruguay Marcelo Wallau --- University of Florida, USA Pablo Boggiano --- University of the Republic, UruguayUnderstanding the relationship between vegetation attributes and defoliation patterns at multiple spatiotemporal scales is crucial for optimising grazing systems. This study assessed the structural attributes of vegetation and the effects of defoliation frequency and intensity in a campos grassland under... -
Generalized A-numerical radius inequalities in semi-Hilbert spaces through the angle between two vectors
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mojtaba Bakherad --- University of Sistan and Baluchestan, IranThis paper presents several inequalities related to the A-numerical radius in the context of semi-Hilbert space operators. By integrating modern techniques from operator theory and functional analysis, we derive new inequalities for the A-numerical radius that emphasize the unique characteristics... -
The Extractive Industries Transparency Initiative (EITI): exploring global extractive firms’ interpretation of EITI initiatives in Ghana’s mining sector amidst institutional complexity
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Hevina S. Dashwood --- , Uwafiokun Idemudia --- , Bill Buenar Puplampu --- , Kernaghan Webb --- ,The Extractive Industries Transparency Initiative (EITI) is a global governance initiative that has the primary goal of promoting greater transparency and accountability concerning the use of royalties paid by global extractive firms to governments. Global extractive firms are largely supportive... -
One-sided W-core inverses of rectangular matrices
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Bing Dong --- School of Mathematics, Hefei University of Technology, China Daihan Xu --- School of Mathematics, Hefei University of Technology, China Huihui Zhu --- School of Mathematics, Hefei University of Technology, ChinaThe main purpose of this article is to introduce the w-core inverse (and its one-sided versions) of rectangular matrices. The relationship between the right W-core inverse and the left W-core inverse is studied. Several basic properties and characterizations on W-core... -
On SVc -Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Amir Veisi --- Yasouj University, Iran Zahra Keshtkar --- Yasouj University, IranWe say that a topological space X is an SVc-space if Cc (X) is an SV - ring, that is, is a valuation ring for every prime ideal P of Cc (X). The purpose of this paper is to study... -
Making a Home together: Class Entanglements and Dependency on Cheap Labour in the Afromodern City
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Lena L. Kroeker --- University of Bayreuth, GermanyThis ethnographic article focuses on a Kenyan upper-middle-class neighbourhood to draw conclusions about the practices of social boundaries. The city of Kisumu appears geographically segregated along several class divides. In the upper-middle-class quarter this study examines, I describe the neighbourhood... -
Nairobi’s Marginal Postcolonial Homes: The House Signifier in Meja Mwangi’s Fiction
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Jairus Omuteche --- Masinde Muliro University of Science and Technology, KenyaThis paper uses Meja Mwangi’s novels Cockroach Dance and Going Down River Road to assess the author’s portrayal of ‘house’ as a versatile signifier for the alienation of Nairobi’s postcolonial urban space. In other words, the paper examines how far... -
Divergent Housing Spatialities and Gender Subjectivities in Transition: Women's Cooperatives and Poverty Eradication Discourse in Dakar, Senegal
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Elettra Griesi --- Collaborative Research Centre 1265, Technische Universität Berlin, GermanyThis article examines the dynamic relationship between spaces and subjectivity, demonstrating how they mutually influence each other to produce distinctive housing spatialities. Through ethnographic research in Thiaroye sur Mer, Dakar (Senegal), I analyze how women's subjectivities, responding to historical processes... -
Stereotypical Home Making: Producing Subjects through Spatial Stories in Afronovelas
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Daddy Dibinga Kalamba --- Techniche Universität, Germany Séverine Marguin --- Techniche Universität, GermanyIn recent decades, television series in Senegal and Côte d'Ivoire have emerged as influential mass media forms with broad audiences, driven by a dynamic and rapidly evolving industry in these countries. In this paper, we study series belonging to the... -
Generalized Ƶ-solitons on Perfect Fluid Spacetimes in f(r, T)-Gravity
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Shahroud Azami --- Imam Khomeini International University, Iran Uday Chand De --- University of Calcutta, India Mehdi Jafari --- Payame Noor University, IranThis research paper aims to investigate the properties of almost generalized Ƶ-solitons and almost gradient generalized Ƶ-solitons on perfect fluid spacetimes within f(r, T)-gravity. Initially, we derive some properties of the potential vector field associated with the almost gradient generalized... -
A generalized mid summability in Banach spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Aleena Philip --- , India Deepika Baweja --- , IndiaIn this paper, we study the notion of mid summability in a general framework, emphasizing the key role played by the norm iteration property. We introduce the vector valued sequence space λmid (X ) associated with a Banach space X... -
Establishing a basis for recognising marine ‘other effective area-based conservation measures’ (OECMs) in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SP Kirkman --- Fisheries and the Environment (DFFE), South Africa P Kowalski --- , South Africa SD Holness --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa LJ Atkinson --- , South Africa R Brand --- Western Cape Government, South Africa L Dunga --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa TP Fairweather --- Fisheries and the Environment (DFFE), South Africa T Goldman --- Rhodes University, South Africa D Marnewick --- Eastern and Southern Africa Regional Office, South Africa J Nhleko --- Fisheries and the Environment (DFFE), South Africa R Peter --- Fisheries and the Environment (DFFE), South Africa C Smith --- World Wide Fund for Nature – South Africa (WWF-SA), South Africa MG van der Bank --- South African National Biodiversity Institute (SANBI), Kirstenbosch Research Centre, South Africa G van der Heever --- Fisheries and the Environment (DFFE), South Africa L van Niekerk --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa KA Wright --- Wildlands Conservation Trust (WILDTRUST), South Africa KJ Sink --- Institute for Coastal and Marine Research, Nelson Mandela University, South AfricaThe concept of ‘other effective area-based conservation measures’ (OECMs) and its technical guidance provide opportunities for recognising a broader range of area-based management measures that contribute to biodiversity conservation outside of protected areas. However, progress towards the recognition of OECMs... -
Quality assessment of groundwater in a crystalline semi-urbanised environment (Lefock watershed, Cameroon)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Lauric Tontsa --- University of Dschang, Cameroon Emile Temgoua --- University of Dschang, Cameroon Obina Chigoziem Akakuru --- Federal University of Technology, Nigeria Hara Toukou --- University of Dschang, Cameroon Guillaume Bertrand --- Univerité de Bourgogne Franche-Comté, France Patrick Lachassagne --- Université de Montpellier, FranceThis study provides an assessment of the hydrogeochemical processes influencing shallow groundwater quality in the Lefock watershed (crystalline area, Cameroon). Seventeen groundwater samples were collected in May 2021 during the rainy season. These samples were analysed for their physical characteristics... -
Distribution and movement patterns of white musselcracker Sparodon durbanensis, a South African endemic seabream
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- Oceanographic Research Institute (ORI), South Africa GL Jordaan --- Oceanographic Research Institute (ORI), South Africa R Daly --- Oceanographic Research Institute (ORI), South Africa WN Dalton --- Oceanographic Research Institute (ORI), South Africa PA Watt-Pringle --- Oceanographic Research Institute (ORI), South Africa K Hewett --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaThe white musselcracker Sparodon durbanensis (family Sparidae) is a highly prized shore angling and spearfishing species. This study investigated its movement behaviour along the southeastern seaboard of South Africa, using tag-recapture data. A total of 3 378 S. durbanensis were... -
Impact of catch and release on the welfare of bronze seabream Pachymetopon grande in the South African marine shore-based fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- Rhodes University, South Africa MW Farthing --- Rhodes University, South Africa CS Bova --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaThe practice of catch-and-release (C&R) angling is increasingly being integrated into recreational fisheries as a conservation strategy to promote sustainability. However, C&R can still have lethal or sublethal effects owing to various stressors involved in the act of angling. Using... -
The movements of adult leerfish Lichia amia in the Breede Estuary, Western Cape, South Africa: insights from acoustic telemetry
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WM Kilian --- Rhodes University, South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JD Filmalter --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TF Næsje --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa RJ Wasserman --- Rhodes University, South AfricaLeerfish Lichia amia inhabit estuaries as juveniles before moving between estuaries and the marine environment as sub-adults and adults. While adults remain mostly in the marine environment, philopatry has been observed, with individuals returning to areas previously used, including estuaries... -
The behavioural response of an estuarine teleost (Cape stumpnose Rhabdosargus holubi) to angler bait collection in two adjacent Eastern Cape estuaries, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- Rhodes University, South Africa B van Heerden --- Rhodes University, South Africa MW Farthing --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaReports of learned behavioural adaptations of wild Cape stumpnose Rhabdosargus holubi (family Sparidae) were investigated in two estuarine systems in the Eastern Cape Province, South Africa. Underwater observational trials using video cameras demonstrated that fish rapidly responded to bait collection... -
Assessment of the movement behaviour of dusky kob Argyrosomus japonicus along the coast of South Africa using 39 years of tag-recapture data from a voluntary tagging project
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Knight --- Rhodes University, South Africa M Farthing --- Rhodes University, South Africa A Winkler --- Rhodes University, South Africa BQ Mann --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaThe dusky kob Argyrosomus japonicus (family Sciaenidae) is a large-sized estuarine-dependent fish of high fisheries importance, with only ∼1.3% of the pristine stock remaining due to overexploitation, habitat loss and mismanagement. Its conservation is complicated by the species’ cryptic morphology... -
Influence of the Benguela Upwelling System on the genetic connectivity of blacktail seabream Diplodus capensis across southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WF Olivier --- Genetics and Microbiology, University of Pretoria, South Africa WM Potts --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa C Santos --- Agostinho Neto University, Angola PW Shaw --- Aberystwyth University, R Henriques --- Genetics and Microbiology, University of Pretoria, South AfricaOceanographic features such as upwelling cells and currents contribute to shaping the evolutionary history of marine fishes, including species that may be important socio-economic resources. However, the impacts of these barriers are often cryptic and may change, particularly in a... -
Managing land use transitions to safeguard transhumance corridors in arid eastern Morocco: challenges and adaptive strategies
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Imane Hamzaoui --- Hassan II Agronomy and Veterinary Medicine Institute, Morocco Mohamed Chikhaoui --- Hassan II Agronomy and Veterinary Medicine Institute, Morocco Nicolas Faysse --- , France Mohamed Taher Sraïri --- Hassan II Agronomy and Veterinary Medicine Institute, MoroccoThe conversion of rangelands and barren lands into agricultural use destabilises fragile pastoralism. This study examines the drivers and impacts of this transformation on pastoralism in Tinghir province, Morocco, using geospatial analysis, semi-structured interviews with pastoralists, discussions with officials and... -
Pelczyński’s property (V) and (V∗) on tensor products and spaces of compact operators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Qingying Bu --- University of Mississippi, University, USALet U be a reflexive Banach space with an unconditional basis and X be any Banach space. We show that if X has Pelczyński’s property (V) then (U,X) has Pelczyński’s property (V). We also show that if X has Pelczyński’s... -
Approximation and Compactness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E. Colebunders --- Vrije Universiteit Brussel, België R. Lowen --- Universiteit Antwerpen, BelgiëIn approach theory convergence is described by means of limit and adherence operators acting on filters or ultrafilters. The value of the limit resp. adherence operator on an (ultra)filter in a point x is interpreted as the distance that the... -
Climate adaptation, geopolitics, and structural exclusion in South African agriculture
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Michael J Savage --- South African Journal of Plant and Soil,Southern African agriculture stands at a critical intersection of accelerating climate risk and entrenched structural inequality. While climate change increasingly shapes global research and policy agendas, other intersecting forces—such as the divide between large-scale commercial agriculture and smallholder farming, the... -
Buried voices, hidden languages: The (in)visibility of indigenous South African languages in the South African Journal of African Languages (SAJAL) from 1994 to 2023
Item type: Journal Article • Journal: South African Journal of African Languages • Authors: Mlamli Diko --- University of South Africa, South AfricaThe South African Journal of African Languages was officially established in 1981 to advance the visibility and intellectualisation of indigenous South African languages as outlined in its aims and scope. Regrettably, greatly entrenched imperialist ideologies obstruct these languages’ comprehensive visibility... -
Influence of land use and cover on the spatio-temporal analysis of the energy balance in a conservation unit
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Liliane Moreira Nery --- Institute of Science and Technology, Brazil Gabriela Gomes --- Institute of Science and Technology, Brazil Nícholas de Paula Nicomedes --- Institute of Science and Technology, Brazil Bruno Pereira Toniolo --- Institute of Science and Technology, Brazil Raphael de Vicq Ferreira da Costa --- Department of Earth Sciences at the University of Minho, Brazil Darllan Collins da Cunha e Silva --- Institute of Science and Technology, BrazilThis study employs Landsat satellite imagery, interpolated meteorological data and the Surface Energy Balance Algorithm for Land (SEBAL) to estimate the energy balance and evapotranspiration (ET) within the Itupararanga Environmental Protection Area (Itupararanga EPA), located in the Atlantic Forest biome... -
Nehari manifold approach for a singular multi-phase variable exponent problem
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mustafa Avci --- Athabasca University, CanadaThis paper is concerned with a singular multi-phase problem with variable singularities. The main tool used is the Nehari manifold approach. Existence of at least two positive solutions with positive-negative energy levels are obtained. For the illustration of the main... -
Optimizing real-time stereo image retargeting for AR/VR: Lightweight disparity CNNs on AI-Driven edge architectures
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mahendra T. Jagtap --- University of South Florida, Muma College of Business (Sarasota-Manatee Campus), USA Bhuvan Unhelkar --- University of South Florida, USA Pravin R. Kshirsagar --- JD College of Engineering and Management, India Nitin Rakesh --- Symbiosis Institute of Technology, India R. Thiagarajan --- VelTech multiTech Dr. Rangarajan Dr. Sakunthala Engineering College, India Vishal Patil --- Loknete Gopinathji Munde Institute of Engineering Education & Research, Nashik and SPPU, IndiaReal-time stereo image retargeting for augmented reality (AR) and virtual reality (VR) necessitates precise per-pixel depth estimation and ultra-low latency performance on resource-limited edge devices. Current disparity convolutional neural networks (CNNs) and retargeting pipelines are unable to meet these demanding... -
Binormal block Toeplitz operators with matrix valued circulant symbols
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Nihat Gökhan Göğüş --- Sabanci University Istanbul, Turkey Rewayat Khan --- Sabanci University Istanbul, Turkey Eungil Ko --- Ewha Womans University, Korea Ji Eun Lee --- Sejong University, Republic of KoreaThis paper focuses on the binormality of block Toeplitz operators with matrix valued circulant symbols. We also study some Γ-dilations of Toeplitz operators. Moreover, we also analyze the invariant subspace of Toeplitz operators with matrix-valued symbols. -
Systematic scoping review on HIV services for males in Sub-Saharan Africa: Access, barriers, and research gaps
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Patience Manjengwa --- School of Health Systems and Public Health, University of Pretoria, South Africa Clarence Yah --- School of Health Systems and Public Health, University of Pretoria, South Africa Nozipho Musakwa --- Health Economics and Epidemiology Research Office, South Africa Alfred Musekiwa --- School of Health Systems and Public Health, University of Pretoria, South Africa -
Composition operators on the weighted BMOA spaces with closed range
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Rikio Yoneda --- Institute of Human and Social Sciences, Kanazawa University, JapanWe study the composition operator C φ with closed range on the weighted space : -
Effects of nonlocal source terms on Kirchhoff-type double phase equations with variable exponents: Existence of three distinct solutions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Khaled Kefi --- Center for Scientific Research and Entrepreneurship, Northern Border University, Saudi Arabia Haikel Ouerghi --- Department of Quantitative Methods, Jendouba University, Research Laboratory of Mathematics and Applications, Tunisia Khaled Benali --- Department of Mathematics, Faculty of Sciences of Gabes, Research Laboratory of Mathematics and Applications, Tunisia Nguyen Thanh Chung --- Faculty of Mathematics and Information Technology, The University of Danang - University of Science and Education, VietnamThis paper investigates a class of Kirchhoff-type double phase problems distinguished by the inclusion of two nonlocal source terms and formulated in the framework of variable exponent Sobolev spaces. By applying a variant of Bonanno’s critical point theorem [12], we... -
Cauchy approachable functions and spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Pratulananda Das --- Department of Mathematics, Jadavpur University, India Sujan Khna --- Department of Mathematics, Jadavpur University, India Sudip Kumar Pal --- Department of Mathematics, Diamond Harbour Women’s University, IndiaIn the context of functions between metric spaces, we introduce a new class of functions which we called Cauchy approachable function which happens to lie between the classes of continuous functions and Cauchy regular functions. A significant characteristic of these...
