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Evaluating Forestry Land During Inflationary Times
Item type: Journal Article • Journal: South African Forestry Journal • Authors: H. J.E. Uys --- Department of Forest Science,The Land Expectation Value criterion has been used since 1849 to calculate the value of forestry land. It was, however, developed in a static financial environment, and is no longer suitable for land valuation in today's dynamic financial environment. This... -
The Hydrological Effects of a Wildfire in a Eucalypt Afforested Catchment
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D.F. Scott --- Division of Forest Science and Technology, Jonkershoek Forestry Research Centre, RSA R.E. Schulze --- Department of Agricultural Engineering, RSAA high-intensity wildfire through a humid, upland catchment which was partially afforested to Eucalyptus fastigata, markedly increased stormflows and caused high soil losses off the afforested slopes. Total streamflow yield was unchanged but baseflow was reduced after the fire. The... -
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... -
The Effect of Site Preparation and Tending on the Growth of Pinus radiata in the Southern Cape: Five Year Results
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Lee Cunningham --- ,This paper details the latest results of site preparation and tending experiments in Pinus radiata on regenerated sites, on both Kruisfontein Plantation in the Southern Cape District of the Western Cape Forest Region and Blueliliesbush Plantation in the Tsitsikamma Forest... -
Yield assessment of advanced wheat breeding lines the Winter Rainfall Region of South Africa. I. Homogeneity of the region
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- ,The major wheat-producing areas in the Winter Rainfall Region are geographically divided into the Rûens and Swartland. The question whether the Rûens and Swartland should be regarded as non-similar areas, each meriting its own wheat-breeding programme, is considered. Correlations between... -
Utility of ear plots versus hill and row plots in wheat breeding programmes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K.W. Pakendorf --- , Republic of South AfricaYield testing in early generations of wheat breeding programmes is limited by large numbers of lines and small amounts of seed. This paper compares yield testing using conventional row plots, hill plots and small single-ear plots. The effects of smaller... -
Typifying late-season weather for maize yield prediction
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. St. E. Clemence --- , Republic of South Africa J.B. Mallett --- , Republic of South AfricaLong-term weather data were used to generate typical weather records. By substituting typical weather data for actual late-season weather data it was possible to compute yield predictions using the model CERES-Maize, and compare these with predictions based on full season... -
A diallel study of yield differences among six well-adapted semi-dwarf spring wheats
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.F. Marais --- Department of Genetics and Institute for Biotechnology, Republic of South Africa P.S. Botma --- Department of Agriculture and Water Supply, Republic of South AfricaA diallel study of the variability for yield that remained after an effort to exclude some of the factors known to contribute strongly to yield variation in the Winter Rainfall Region, was done. Overdominance resulted in strong heterosis effects which... -
CLIMGEN-UP: A user-friendly weather data generator
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.Z. Jovanovic --- Department of Earth Sciences, South Africa J.G. Annandale --- Department Plant Production and Soil Science, South Africa N. Benadè --- , South Africa G.S. Campbell --- , USAUser-friendly Windows software, CLIMGEN-UP, was developed based on the CLIMGEN weather data generator. CLIMGEN-UP calculates and stores monthly statistical parameters, based on historic data of daily rainfall, minimum and maximum temperature. It can then generate and store long-series of daily... -
Modelling of rainfall occurrences at Grootfontein (Karoo, South Africa)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Venter --- Department of Soil, South Africa M.T. Mebrhatu --- Department of Soil, South AfricaThe modelling approach that was followed in this study makes use of a record of daily rainfall, dealing with seasonality by partitioning the year into a number of approximately homogeneous ‘seasons’. The capabilities of two models to preserve various observed... -
Estimates of combining ability for agronomic traits in pepper (Capsicum annuum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.F. Geleta --- Department of Plant Sciences, South Africa M.T. Labuschagne --- Department of Plant Sciences, South AfricaTwenty-one F1 hybrids were obtained from non-reciprocal crosses among seven genetically diverse pepper genotypes. The parents and F1 (S were evaluated for combining ability and the relative importance of additive and non-additive gene action. The plants were grown in a... -
Measuring water stress in Pinus patula Schiede ex Schlect. & Cham. seedlings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.A. Rolando --- , K.M. Little --- ,A pot trial was conducted to investigate measures of water stress for Pinus patula seedlings planted for commercial forestry in South Africa. The objectives were to determine the efficacy of different equipment for quantifying water stress, and the effect of... -
Quantifying commercial catch and effort of monkfish Lophius vomerinus and L. vaillanti off Namibia
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: L. Maartens A. J. BoothAbundance and exploitation patterns of monkfish Lophius vomerinus and L. vaillanti were investigated for use as inputs into a stock assessment framework to be used for management of the Namibian monkfish resource. Total numbers of monkfish caught per size-class were... -
GLM-based standardization of the catch per unit effort series for South African west coast hake, focusing on adjustments for targeting other species
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. P. Glazer D. S. ButterworthCatch per unit effort (cpue) data for the South African west coast Cape hakes Merluccius capensis and M. paradoxus were standardized by applying the Generalized Linear Modelling (GLM) technique. The resulting standardized series indicated that resource abundance declined at a... -
NUTRIENT CYCLING IN MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P. Chapman --- , South AfricaThe overall cycles of nitrogen, phosphorus and silicon in the sea are described and compared. Data on the fluxes and rates of change between various pools of each nutrient are given, where available, and gaps in knowledge are pointed out... -
Effects of fire, bruchid beetles and soil type on germination and seedling establishment of Acacia drepanolobium
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: B.D. Okello T.P. YoungThe effects of fire, bruchid seed beetles and soil type on the germination and seedling establishment of Acacia drepanolobium were experimentally investigated. Seeds subjected to three seed treatments (bruchid damaged, bruchid-free burnt, and bruchid-free unburned) were germinated in three different... -
Adjusting Faustmann's formula for the South African forestry environment
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Eksteen Uys --- Department of Forest Science, South AfricaThe forestry industry in South Africa is characterised by frequent changes in land ownership and the valuation of forestry land consequently forms a regular task of forestry valuers. Traditionally the value of bare forestry land was determined by calculating the... -
(Teen)Age is More than a Number: Generational Identity within the Context of HIV and AIDS
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Shakila Reddy --- University of KwaZulu-Natal,This study explored some of the complexities through which young adults construct and represent their sexual identities within the context of HIV/AIDS. The sample comprised a total of 136 (female = 77; male = 59) Indian and African learners, who... -
Development and Initial Validation of a General Psychological Well-being Scale (GPWS) in an African Context
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Itumeleng P. Khumalo --- North-West University, South Africa Q. Michael Temane --- North-West University, South Africa Marié P. Wissing --- North-West University, South AfricaThis study aimed to develop and validate the General Psychological Well-being Scale (GPWS) in an African sample, based on the empirical overlap between hedonic and eudaimonic facets of well-being as found in previous research. The quantitative cross-sectional study was conducted... -
Sex Offender Assessment Procedures: A South African Comparison
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Anni Hesselink --- University of South Africa, Johan Prinsloo --- University of South Africa,This study reports on the results of a reflective case analysis of a first generation assessment procedure of a chronic offender. The assessment focused on offender's experiential world and his pathway to crime, including precipitating crime risk factors as well... -
Older People's Portrayal in the Print Media: Implications for Intergenerational Relations
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Samiera Sedick --- North-West University, South Africa Vera Roos --- North-West University, South AfricaThis study explored the perceptions of older people in a residential care facility regarding how they are portrayed in the print media and the implications of such portrayal for intergenerational relations. Twenty-one older residents in a residential care facility participated... -
Enhancing Emotional and Social Competence in a Group of South-African School Beginners: A Preliminary Study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Elmarí Deacon --- North-West University, South Africa Esmé van Rensburg --- North-West University, South AfricaThis study piloted the efficacy of a short-term intervention program for socio-emotional development in pre-schoolers.in a South African setting. Participants were 48 learners, aged between 5 and 6 years (22 boys, 26 girls). A proportion of the participants (n=26) took... -
A Model for Psychosocial Well-Being of Families in a South African Context
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Vicki Koen --- North-West University, South Africa Chrizanne van Eeden --- North-West University, South Africa Sebastiaan Rothmann --- North-West University, South AfricaThis study applied the approach of Dickoff, James, and Wiedenbach (1968) to construct a conceptual framework and a model for the psychosocial well-being of families from diverse cultures in a South African context. Findings from previous qualitative research served as... -
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. -
Non-cancellation Phenomena in the Class Of Finitely Generated Groups with Finite Commutator Subgroups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Habtay GhebrewoldWe observe some non-cancellation phenomena arising from recent studies of the non-cancellation set χ (G) of a certain group G. Here χ (G) denotes the set of all isomorphism classes of groups H such that H × Z G ×... -
Balanced and Closed-generated Filters In Frames
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Themba DubeWe introduce the notions of balanced filters and closed-generated filters in frames and use them to give a new characterisation of normality for frames, and hence, due to normality being a conservative property, a new characterisation of normality for topological... -
Generalized Derivations of Associative Algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Hiroaki Komatsu Atsushi NakajimaIn their paper [6], Leger and Luks introduced the notion of a generalized derivation in nonassociative algebras and got several results for generalized derivations of Lie algebras. This generalized derivation is closely related to Breˇsar's and the second author's generalized... -
The Pills Problem Revisited
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: CharlotteA.C. Brennan Helmut ProdingerWe revisit the pills problem proposed by Knuth and McCarthy. In a bottle there are m large pills and n small pills. The large pill is equivalent to two small pills. Every day a person chooses a pill at random... -
The Termwise Equivalence of The Varieties of L-group Cones and Cancellative Generalized Hoops
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: C.J. Van AltenWe show that the varieties of l-group cones and of cancellative generalized hoops are termwise equivalent. We conclude that the varieties of l-groups and cancellative generalized hoops are categorically equivalent. -
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... -
Permutation actions of the symmetric group Sn on the Groups Zn m and Zn m
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jamshid Moori Kenneth ZimbaLet m and n be positive integers. Let Z m = {0, 1, …, m − 1} be the cyclic group of order m and Z n m be the direct product of n copies of Z m . We... -
The first and last ascents of size d or more in samples of geometric random variables
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Charlotte Brennan Arnold KnopfmacherWe consider words or strings of characters a 1 a 2 a 3…a n of length n, where the letters ai ∈ N are independently generated with a geometric probability -
FISCHER-CLIFFORD MATRICES OF B (2, n)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jamshid Moori Kenneth ZimbaIn [3] Almestady has presented a combinatorial method for constructing the Fischer-Clifford matrices of the generalized symmetric groups B(m, n), where m and n are positive integers. As a few examples for small values of m and n show, the... -
(Φ, M)–extensions of near-rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mark FaragIn this paper, we define and study a generalization of matrix, polynomial, and group near-rings. New results on ideal essentiality and lying over are obtained. -
Cutting down very simple trees
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Alois PanholzerWe study here, by using a recursive approach, the number of random cuts that are necessary to destroy a random tree of size n for simply generated tree families. Crucial for the applicability of such a recursive approach is a... -
Complete compositions of a natural number
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Richard WarlimontAn alternative proof is given for the recently established fact that approximately one half of all compositions of a natural number are complete. -
Minimal generating sets of groups, rings, and fields
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Lorenz Halbeisen Martin Hamilton Pavel RůžičkaA subset X of a group (or a ring, or a field) is called generating, if the smallest subgroup (or subring, or subfield) containing X is the group (ring, field) itself. A generating set X is called minimal generating, if... -
On the Maximal Function for the Generalized Ornstein-uhlenbeck Semigroup.
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jorge Betancor Liliana Forzani Roberto Scotto WilfredoO. UrbinaIn this note we consider the maximal function for the generalized Ornstein-Uhlenbeck semigroup in R associated with the generalized Hermite polynomials {H μ n } and prove that it is weak type (1,1) with respect to dλ... -
Abelian Groups with a Minimal Generating Set
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Pavel Růžčka --- Department of Algebra, Sokolovská, Czech RepublicWe study the existence of minimal generating sets in Abelian groups. We prove that Abelian groups with minimal generating sets are not closed under quotients, nor under subgroups, nor under in.nite products. We give necessary and su.cient conditions for existence... -
Peaks and Valleys in Motzkin Paths
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Charlotte Brennan --- , South Africa Simon Mavhungu --- Department of Mathematics, South AfricaA Motzkin path is a non-negative lattice path in N2 starting at the origin, where only three types of steps are allowed: the diagonal up step (1, 1) called u, the diagonal down step (1, −1) called d and the... -
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. -
On Prime and Semiprime Near-Rings with Generalized Derivation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Öznur Gölbaşi --- Department of Mathematics, TurkeyLet N be a left near-ring and S be a nonempty subset of N. A mapping F from N to N is called commuting on S if [F(x),x] = 0 for all x € S. The mapping F is called... -
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. -
A note on generating functions for Rogers-Szegő polynomials
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jian Cao --- Department of Mathematics, P.R. ChinaIn this paper, the details of certain Carlitz's generating functions for Rogers-Szegőpolynomials and their generalizations are given by Carlitz's q-operators. In addition, an additional proof of Srivastava-Jain's generating function is shown. At last, generalizations of Srivastava-Agarwal type generating functions are... -
Efficient spectral-Petrov-Galerkin methods for third- and fifth-order differential equations using general parameters generalized Jacobi polynomials
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: W.M. Abd-Elhameed --- Department of Mathematics, Faculty of Science, Saudi Arabia E.H. Doha --- Department of Mathematics, Faculty of Science, Giza-Egypt Y.H. Youssri --- Department of Mathematics, Faculty of Science, Giza-EgyptTwo new families of general parameters generalized Jacobi polynomials are introduced. Some efficient and accurate algorithms based on these families are developed and implemented for solving third- and fifth-order differential equations in one variable subject to homogeneous and nonhomogeneous boundary... -
On the metric dimension of generalized Petersen graphs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Shabbir Ahmad --- Centre for advanced studies in Pure and Applied Mathematics, Pakistan Muhammad Anwar Chaudhry --- Centre for advanced studies in Pure and Applied Mathematics, Pakistan Imran Javaid --- Centre for advanced studies in Pure and Applied Mathematics, Pakistan Muhammad Salman --- Centre for advanced studies in Pure and Applied Mathematics, PakistanA family G of connected graphs is said to be a family with constant metric dimension if its metric dimension is finite and does not depend upon the choice of G in G. In this paper, we study the metric... -
Contexts of vulnerability: Sex, secrecy and HIV/AIDS
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: EleanorM Preston-Whyte --- , South AfricaWritten before the announcement of a national roll out of antiretroviral treatment in South Africa, this paper uses three illustrative vignettes to draw attention to some major areas of HIV/AIDS vulnerability related to the themes of sex and secrecy within... -
Ecological association between HIV and concurrency point-prevalence in South Africa's ethnic groups
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Chris Kenyon --- Senior Lecturer, Division of Infectious Diseases and HIV Medicine, South AfricaHIV prevalence between different ethnic groups within South Africa exhibits considerable variation. Numerous authors believe that elevated sexual partner concurrency rates are important in the spread of HIV. Few studies have, however, investigated if differential concurrency rates could explain differential... -
Support groups for HIV-positive people in South Africa: Who joins, who does not, and why?
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Wenche Dageid --- Department of Psychology, NorwayPsychosocial health care for persons living with HIV/AIDS (PLWHA) is inadequate. Support groups for PLWHA could offer arenas where psychosocial issues are addressed, yet more knowledge is needed about those who join and those who do not join such groups... -
Relationship between water temperature predictability and aquatic macroinvertebrate assemblages in two South African streams
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR Eady --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa NA Rivers-Moore --- Centre for Water Resources Research, South Africa TR Hill --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South AfricaVariable seasonal stream temperatures are a critical factor in maintaining aquatic invertebrate community patterns. We investigated whether the degree of predictability in a stream's water temperature profile provides insights into the structure and functional predictability of macroinvertebrate communities. Quarterly macroinvertebrate... -
Movement patterns of coastal bottlenose dolphins in the presence of a fast-flowing, prevailing current: shore-based observations at Cape Vidal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Photopoulou --- Sea Mammal Research Unit, UK PB Best --- , South Africa PS Hammond --- Sea Mammal Research Unit, UK KP Findlay --- Department of Oceanography, University of Cape Town, South AfricaThe presence and movement of Indo-Pacific bottlenose dolphins Tursiops aduncus were investigated using shore-based observations made during a humpback whale Megaptera novaeangliae migration survey at Cape Vidal, South Africa, undertaken between June and October 1988–1991. Occurrence was analysed as counts... -
Seasonal fluctuations in occurrence of inshore Bryde's whales in Plettenberg Bay, South Africa, with notes on feeding and multispecies associations
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GS Penry --- , UK VG Cockcroft --- Department of Zoology, Nelson Mandela Metropolitan University, South Africa PS Hammond --- , UKSeasonal fluctuations in the occurrence of inshore South African Bryde's whales Balaenoptera edeni were investigated between November 2005 and June 2008. Sighting data were collected in Plettenberg Bay on the south-east coast of South Africa. Bryde's whale occurrence was modelled... -
Evidence of hybridisation within the genus Chrysoblephus and conserved nuclear sequences of South African sparids (Teleostei: Sparidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S von der Heyden --- Evolutionary Genomics Group, Department of Botany and Zoology, South Africa A Connell --- , South AfricaSeveral hybridisation events have been recorded in marine fish, yet there is little information for southern African species. Here we present evidence for hybridisation within the genus Chrysoblephus (Sparidae), by analysing a fish caught off KwaZulu-Natal, off the east coast... -
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... -
Patterns in abundance, population structure and biology of knife prawn Haliporoides triarthrus on deep-water trawl grounds off eastern South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Robey --- Oceanographic Research Institute, South Africa ST Fennessy --- Oceanographic Research Institute, South Africa BI Everett --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fisheries Science, Norway JC Groeneveld --- Oceanographic Research Institute, South AfricaThe deep-water trawl fishery along the KwaZulu-Natal coast of South Africa targets several crustacean species, with the knife (or pink) prawn Haliporoides triarthrus contributing most of the catch. Logbook data of fishing effort and catch between 1988 and 2010 were... -
A Knowledge Generation System and Innovation Policy for countries of the Customs Union (Belarus, Kazakhstan, Russia)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Nina Bohdan --- , BelarusThis paper considers the problem of forming a Single Economic Area of the Customs Union (Belarus, Russia and Kazakhstan) from the perspective of knowledge generation. Based on the commonalities of knowledge generation and the characteristics of the post-Soviet development, there... -
Breeding strategies for forest trees: Concepts and challenges
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: T White --- School of Forest Resources and Conservation, U.S.A.This paper describes some recent developments that affect the way forest geneticists think about breeding strategies for forest trees. The topics are grouped into several categories: (1) General Concepts; (2) Breeding Population Size; (3) Breeding Population Structure; (4) Management of... -
Survival and growth of Pinus patula at two years in response to harvest residue and pest management, in Mpumalanga, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Carol Rolando --- , Ross Allan --- ,Previous research has indicated that the presence of harvesting residues, post-planting tern perature and rainfall, and insect pests and diseases, are among the main causes of mortality during re-establishment of Pinus patula stands. The main objectives of this work were... -
Stand biomass and volume estimation for Miombo woodlands at Kitulangalo, Morogoro, Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.A.O. Chamshama --- Faculty of Forestry and Nature Conservation, Tanzania A.G. Mugasha --- Faculty of Forestry and Nature Conservation, Tanzania E. Zahabu --- Faculty of Forestry and Nature Conservation, TanzaniaTree volume and biomass equations developed for Kitulangalo area in Morogoro, Tanzania ignored small branches and small trees. Consequently, this study was carried out to develop new individual tree volume and biomass equations, and assess current regeneration status, biodiversity and... -
The effect of anthropogenic disturbances on population structure and regeneration of Scorodophloeus fischeri and Manilkara sulcata in coastal forests of Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: C Mligo --- Department of Botany, Tanzania HVM Lyaruu --- Department of Botany, Tanzania HJ Ndangalasi --- Department of Botany, TanzaniaScorodophloeus fischeri (Fabaceae, subfamily Caesalpinoideae) and Manilkara sulcata (Sapotaceae) are examples of tropical African hardwood species and are endemic to East African coastal forests. These plant species are threatened by human activities beyond natural recovery in some forests. This study... -
A comparison of collinearity mitigation techniques used in predicting BLUP breeding values and genetic gains over generations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: KA Eatwell --- Department of Genetics, South Africa SD Verryn --- , South Africa CZ Roux --- Department of Genetics, South Africa PJM Geerthsen --- , South AfricaCollinearity potentially has a negative impact on the prediction of genetic gains in tree breeding programs. This study investigated the reliability and impact of best linear unbiased prediction (BLUP) using various collinearity mitigation techniques and of two computational numerical precisions... -
Local community perception of joint forest management and its implications for forest condition: the case of Dambwa Forest Reserve in southern Zambia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M Phiri --- Forestry Department, Zambia Forest Research Division, Zambia PW Chirwa --- Faculty of Natural and Agricultural Sciences, South Africa S Watts --- , South Africa S Syampungani --- School of Natural Resources, ZambiaThis study conducted at Dambwa Forest Reserve in Livingstone, Zambia, evaluated the perception of local people about joint management of the forest reserve in the area and if there had been improvements to the livelihoods of the community and the... -
Plant regeneration by somatic embryogenesis in Eucalyptus spp.: current status and future perspectives
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Glória Pinto --- Department of Biology and Centre for Environmental and Marine Studies (CESAM), Portugal Clara Araújo --- Altri Florestal SA, Portugal Conceição Santos --- Department of Biology and Centre for Environmental and Marine Studies (CESAM), Portugal Lucinda Neves --- Altri Florestal SA, PortugalForest tree improvement programs benefit from the emergence of new biotechnological strategies that complement plant developmental biology and discovery of genes associated with complex multigenic traits. Recently, significant progress has been made in the area of plant regeneration via somatic... -
Dynamic base-age invariant site index models for Tectona grandis in peninsular India
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vindhya P Tewari --- Institute of Wood Science and Technology, India Juan G Álvarez-González --- Unidad de Gestión Forestal Sostenible, Departamento de Ingeniería Agroforestal, Spain Klaus von Gadow --- Burckhardt Institute, GermanyData from 27 remeasured sample plots were used to evaluate dynamic base-age invariant site index models for teak (Tectona grandis) forests in Karnataka, India. The data were obtained in observational field studies covering a wide range of sites in Karnataka... -
Seed dynamics of Themeda triandra in the montane grasslands of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: TM Everson RI Yeaton CS EversonSeed production, viability, dispersal, predation and seed banks of Themeda triandra were determined to assess the potential of the seeds of this indigenous species in the re-establishment of degraded grassland. Annual seed production of T. triandra increased with length of... -
The Uniform Order Convergence Structure on ML (X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: vanJ.H. der WaltThe aim of this paper is to set up appropriate uniform convergence spaces in which to reformulate and enrich the order completion method [18] for nonlinear Partial Differential Equations (PDEs). In this regard, we consider an appropriate space ML(X) 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... -
Pairings of Sheaves of A-Modules
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Anastasios Mallios PatriceP. NtumbaIt is proved that for any free A-modules F and ε of finite rank on some C-algebraized space (X,A) a degenerate A-bilinear morphism Φ : F × ε → A induces a non-degenerate A-bilinear morphism Φ : F/ε ⊥ ×... -
Algebraic Entropy of Shift Endomorphisms on Abelian Groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Maryam Akhavin --- Faculty of Mathematical Sciences, Iran Dikran Dikranjan --- Dipartimento di Matematica e Informatica, Italy Anna Giordano Bruno --- Dipartimento di Matematica e Informatica, Italy Arezoo Hosseini --- Department of Mathematics, Faculty of Science, Iran Fatemah Ayatollah Zadeh Shirazi --- Faculty of Mathematics, Statistics and Computer Science, College of Science, IranFor every finite-to-one map λ : Γ → Γ and for every abelian group K, the generalized shift σλ of the direct sum ⊕Γ K is the endomorphism defined by (x i ) iεΓ ↦ (x λ(i)) iεΓ [3]... -
Genetic parameters of pure and hybrid populations of Eucalyptus grandis and E. urophylla and implications for hybrid breeding strategy
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: ECL Retief TK StangerIn order to review Sappi Forests' breeding strategy for E. urophylla × E. grandis hybrids, information is required regarding the genetic control of certain traits and the correlations between them. A hybrid seedling progeny trial was planted, comprising material generated... -
Responses of the Serengeti avifauna to long-term change in the environment
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Anthony RE Sinclair --- Beaty Biodiversity Research Centre, Canada Ally Nkwabi --- Serengeti Biodiversity Program, Tanzania Simon AR Mduma --- Beaty Biodiversity Research Centre, Canada Flora Magige --- Department of Zoology and Wildlife Conservation, TanzaniaIn this paper we examine how climate change interacts with other disturbances to alter the functioning of a tropical ecosystem, the Serengeti in Tanzania. Tropical Africa has increasing temperatures and changes in rainfall. Long-term data have shown how the avifauna... -
Management of type 2 diabetes mellitus for general practitioners
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: AM Klisiewicz --- Department of Internal Medicine, KRL Huddle --- Department of Internal Medicine,A 55-year-old Asian man presents with a history of intense thirst, polyuria, blurring of vision and weight loss over a period of several weeks. He is obese with a waist circumference of 110 cm and a body mass index (BMI)... -
The febrile parturient: choice of anesthesia
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Krzysztof M Kuczkowski --- Departments of Anesthesiology and Reproductive Medicine, -
General anaesthesia with and without intubation for patients with Cornelia de Lange syndrome
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Y Asahi --- Department of Dentistry, Japan I Tsujimoto --- Department of Dentistry, Japan Y Kawai --- Department of Anesthesia, Japan M Sugimoto --- Department of Anesthesia, Japan T Suzuki --- Department of Anesthesia, Japan S Omichi --- Department of Dentistry, Japan M Kogo --- The First Department of Oral and Maxillofacial Surgery, Japan J Kotani --- Department of Anesthesiology, JapanWe present the use of different methods of general anaesthesia in two patients with Cornelia de Lange syndrome and its contribution to the patients' oral health. -
Anaesthesia for a morbidly obese patient with schizophrenia and intellectual disability
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Y Asahi --- Department of Dentistry, Japan Y Kawai --- Department of Anesthesia, Japan M Sugimoto --- Department of Anesthesia, Japan T Suzuki --- Department of Anesthesia, Japan S Omichi --- Department of Dentistry, Japan J Kotani --- Department of Anesthesiology, JapanWe report the case of a morbidly obese woman with schizophrenia and intellectual disability who underwent dental treatment using general anaesthesia. The 38-year-old patient was 156 cm tall and weighed 140 kg, with a body mass index of 57.5 kg... -
Anaesthetic management of appendectomy in a patient with cerebral arteriovenous malformation
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: R Taneja --- Department of Anaesthesia, India S Kiran --- Department of Anaesthesia, IndiaBackground: The aim of anaesthetic management for appendectomy in a patient with cerebral arteriovenous malformation (AVM) is to maintain a stable cardiovascular system. As this condition is rare, there are no definitive guidelines regarding the anaesthetic management of such patients. -
Perioperative adverse airway events in cleft lip and palate repair
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: AT Adenekan --- Departments of Anaesthesia and Intensive Care, Nigeria AF Faponle --- Departments of Anaesthesia and Intensive Care, Nigeria FO Oginni --- Departments of Oral and Maxillofacial Surgery, NigeriaBackground: Airway-related problems account for the majority of anaesthetic morbidity in paediatric anaesthesia, but more so for cleft lip and palate repair. The aim of this study was to assess the frequency, pattern, management and outcome of adverse airway events... -
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... -
Sub-Tenon's lidocaine injection improves emergence agitation after general anaesthesia in paediatric ocular surgery
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: AS Elgebaly --- Anaesthesia and Post Surgical Intensive Care Unit (PSICU), Faculty of Medicine, Tanta University, EgyptObjective: This study aimed to evaluate the effect of a sub-Tenon's lidocaine injection on emergence agitation in children receiving sevoflurane or halothane anaesthesia for strabismus surgery. -
A comparison of the referral rates of trainees and trainers in an academic teaching practice
Item type: Journal Article • Journal: South African Family Practice • Authors: RF Ingle --- Department of Family Medicine, JB Levin --- Medical Research Council of South Africa,Objective: To compare the referral rates of trainee and trainer family physicians. -
Medical student attachments in private practice—The experience and views of the family practitioners
Item type: Journal Article • Journal: South African Family Practice • Authors: D O'Mahony --- Family Practitioner,Background: Medical student attachments with family/general practitioners (GPs) in non-academic or private practice are a valued resource in the undergraduate teaching of Family Medicine. This study describes the experience and views of GPs in private practice with final-year medical student... -
Kennis en hantering van slangbyte deur algemene praktisyns op die platteland van die Vrystaat en Noord-Kaap
Item type: Journal Article • Journal: South African Family Practice • Authors: GD Stemmett --- Department of Family Medicine, G Joubert --- Department of Biostatistics, MVJ Van Vuuren --- Dip Forensic Medicine, Department of Family Medicine, -
Obstetrical ultrasound training of and practise by general practitioners in the private sector, Free State
Item type: Journal Article • Journal: South African Family Practice • Authors: S Foulkes --- Department of Family Medicine, G Joubert --- Department of Biostatistics, BL Faber LA Hiemstra --- Department of Family Medicine,Background: The aim of the study was to determine the level of obstetrical ultrasound training and practice of general practitioners in the Free State private sector. -
Die voorkoms en profiel van pasiënte wat by 'n plattelandse praktyk presenteer met psigosomatiese klagtes
Item type: Journal Article • Journal: South African Family Practice • Authors: ADB Bruwer --- Departement Huisartskunde, G Joubert --- Departement Biostatistiek, JP Pretorius --- Departement Psigiatrie, MVJ Van Vuuren --- Departement Huisartskunde,The prevalence and profile of patients presenting with psychosomatic complaints at a rural practice -
Visual hallucinations caused by Charles Bonnet Syndrome: A case study
Item type: Journal Article • Journal: South African Family Practice • Authors: GP Grobler --- , -
General practitioners' familiarity, attitudes and practices with regard to Attention Deficit Hyperactivity Disorder (ADHD) in children and adults
Item type: Journal Article • Journal: South African Family Practice • Authors: C Louw --- Department of Educational Psychology, Faculty of Education, MM Oswald --- Department of Educational Psychology, Faculty of Education, MD Perold --- Department of Educational Psychology, Faculty of Education,Background: Attention-Deficit Hyperactivity Disorder (ADHD) is a common disorder, affecting 4% to 5% of South African children. Recent studies reveal that 30% to 70% of children continue to experience problems related to ADHD in adulthood. Adults are becoming increasingly aware... -
Health risk behaviours of high school learners and their perceptions of preventive services offered by general practitioners
Item type: Journal Article • Journal: South African Family Practice • Authors: C Thomas --- Private Practice and Department of Family Medicine,Background: Adolescence spans nearly a decade in which young people may initiate health risk behaviours such as unsafe sexual practices and the use of alcohol, tobacco and other drugs (ATOD use). Most adolescent mortality and morbidity, attributable to such health... -
Primary health eye care knowledge among general practitioners working in the Cape Town metropole
Item type: Journal Article • Journal: South African Family Practice • Authors: LM Van Zyl --- Division of Ophthalmology, South Africa N Fernandes --- Division of Ophthalmology, South Africa G Rogers --- Division of Ophthalmology, South Africa N Du Toit --- Division of Ophthalmology, South AfricaAim: The main purpose of this study was to determine whether general practitioners (GPs) in the Cape Town metropole have sufficient knowledge to diagnose and treat primary care ophthalmic conditions correctly, and to assess their own perceptions of their levels... -
Sexually transmitted infections among patients attending the General Practice Clinic, Wesley Guild Hospital, Ilesa, Nigeria
Item type: Journal Article • Journal: South African Family Practice • Authors: SS Olakolu --- General Practice Department, Nigeria EA Abioye-Kuteyi --- General Practice Department, Nigeria OO Oyegbade --- General Practice Department, NigeriaBackground: Sexually transmitted infections (STIs) are among the most common infectious diseases in the world today. There are few reliable statistics on the true prevalence of STIs in developing countries, especially in the general practice setting, hence the need to... -
Attention-deficit hyperactivity disorder in adults: a guide for the general practitioner
Item type: Journal Article • Journal: South African Family Practice • Authors: GI Van Schalkwyk --- Stellenbosch University, South Africa J SchronenAttention-deficit hyperactivity disorder (ADHD) has an estimated prevalence of 3.5% in adults. Knowledge regarding the diagnosis and treatment of this condition remains limited amongst general practitioners. The clinical presentation is highly variable, and the manifestations of the characteristic symptoms of... -
Hypertensive disorders in pregnancy and the general practitioner: a vignette and lessons to learn
Item type: Journal Article • Journal: South African Family Practice • Authors: J Moodley --- Department of Obstetrics and Gynaecology and Women's Health and HIV Research Unit,In South Africa, the general practitioner is often the first health professional to provide care and health advice to pregnant women. Estimation of blood pressure levels is an essential basic step, particularly in pregnant women. Hypertensive disorders occur frequently in... -
Healthy lifestyle interventions in general practice: Part 16: Lifestyle and fibromyalgia
Item type: Journal Article • Journal: South African Family Practice • Authors: EW Derman --- UCT/MRC Research Unit for Sports Science and Sports Medicine, S Whitesman --- Institute for Mindfulness, South Africa M Dreyer --- Vitality Wellness, DN Patel --- Vitality Wellness, C Nossel --- Vitality Wellness, MP Schwellnus --- UCT/MRC Research Unit for Sports Science and Sports Medicine,Fibromyalgia is a chronic disorder, characterised by chronic widespread musculoskeletal pain, and the presence of multiple tender points as well as a host of associated symptomatology. Optimal management of patients with fibromyalgia requires a multidisciplinary approach, with a combination of... -
Common scalp disorders in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: MH Motswaledi --- Department of Dermatology,Scalp disorders are very common in general practice, and result in emotional stress in adult patients due to the associated social stigma. They occur as primary diseases of the scalp, as part of a generalised inflammatory skin disease, or as... -
Depression in primary care: the knowledge, attitudes and practice of general practitioners in Benin City, Nigeria
Item type: Journal Article • Journal: South African Family Practice • Authors: BO James --- Department of Clinical Services, Nigeria R Jenkins --- Section of Mental Health Policy, Health Service and Population Research Department, David Goldberg Centre, United Kingdom AO Lawani --- Department of Clinical Services, Nigeria JO Omoaregba --- Department of Clinical Services, NigeriaBackground: Depression contributes significantly to the global burden of disease in developing countries. Poor case detection and inadequate numbers of mental health staff have been associated with increased morbidity among individuals with depression presenting to primary care. In Nigeria, as... -
Dealing with substance use disorders in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: SC Pasche --- Division of Addiction Psychiatry, Department of Psychiatry and Mental Health, DJ Stein --- Division of Addiction Psychiatry, Department of Psychiatry and Mental Health,Substance use disorders are highly prevalent in South Africa. General practitioners are often the first point of contact and play an essential role in correctly identifying the substance use problem. This article provides an overview of the importance of screening... -
An approach to psoriasis in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: MH Motswaledi --- Department of Dermatology, L Nkosi --- Department of Dermatology,Psoriasis is a genetically determined inflammatory and proliferative disease of the skin, presenting with sharply demarcated scaly plaques, especially on the extensor prominences and the scalp. Although it is a clinical diagnosis, biopsy can help to confirm the diagnosis. Treatment... -
Chronic pain management options in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: K Koch [AN0001]Chronic pain affects almost one in five patients, making it one of the most common conditions that any practitioner has to manage on a daily basis. Poorly managed chronic pain has a significant impact on work, social and psychological functioning... -
Microalbuminuria and estimated glomerular filtration rate
Item type: Journal Article • Journal: South African Family Practice • Authors: Y Veriava --- School of Clinical Medicine,Hypertension and diabetes mellitus are the major causes of renal damage and cardiovascular events. The co-existence of these conditions further increases the risk of progressive renal disease, cardiovascular events, and mortality. Urinary excretion of albumin, even in small amounts, and... -
Thoughts on the state of family medicine in South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: I Couper --- Department of Family Medicine, Faculty of Health Sciences, S Fehrsen --- Enablemed (Pty) Ltd, J Hugo --- Department of Family Medicine, Faculty of Health Sciences, -
Agomelatine: a review for general practitioners
Item type: Journal Article • Journal: South African Family Practice • Authors: K Outhoff --- Department of Pharmacology,Agomelatine is a novel melatonergic antidepressant that restores disrupted biological rhythms, essentially by resetting the circadian clock. Two different, non-monoaminergic, and possibly synergistic pathways, appear to be involved in its mechanism of action. Agomelatine is a melatonin 1 (MT1) and... -
Acute pain management in general practice: steps to effective pain control
Item type: Journal Article • Journal: South African Family Practice • Authors: K Koch [AN0001]Pain is one of the most common complaints that general practitioners encounter in everyday practice. The swift and effective management of pain is a medical mandate, not only to fulfil an ethical obligation to the patient, but also to prevent... -
Dealing with major depression in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: CP Freeman --- Department of Psychiatry and Mental Health, JA Joska --- Department of Psychiatry and Mental Health,One in ten South Africans will be diagnosed with major depressive disorder (MDD) at some point in their lives. MDD is a potentially disabling condition that affects many spheres of an individual's life and leads to marked social and occupational... -
Anti-infective ophthalmic preparations in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: D Smit --- Department of Ophthalmology Faculty of Health Sciences,Ocular infections may be bacterial, viral, fungal or parasitic in aetiology. Pharmacological preparations are available to treat infections that are caused by these groups of organisms. The majority of these preparations are intended for topical administration, although some systemically administered... -
Dealing with post-traumatic stress disorder in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: S Suliman --- MRC Anxiety Disorders Unit, Department of Psychiatry, DJ Stein --- Department of Psychiatry and Mental Health,Traumatic experiences are prevalent in South Africa and may result in psychiatric disorders such as post-traumatic stress disorder (PTSD). PTSD is accompanied by a range of psychobiological alterations, including changes in brain structure and functioning. General practitioners have an important... -
The gradual loss of vision
Item type: Journal Article • Journal: South African Family Practice • Authors: N Du Toit --- Division of Ophthalmology,Gradual loss of vision is a clinical problem that is encountered fairly regularly in most primary healthcare settings. Patients present with chronic, slowly progressive and generally painless visual loss. The reduction in vision is usually bilateral, though frequently asymmetrical, and... -
Acute pain management in general practice: steps to effective pain control
Item type: Journal Article • Journal: South African Family Practice • Authors: K Koch [AN0001]Pain is one of the most common complaints that general practitioners encounter in everyday practice. The swift and effective management of pain is a medical mandate, not only to fulfil an ethical obligation to the patient, but also to prevent... -
The role of private general practitioners in the treatment of alcohol dependence in the Free State province
Item type: Journal Article • Journal: South African Family Practice • Authors: PM Van Zyl --- Department of Psychiatry, Faculty of Health Sciences, CA Gagiano --- Department of Pharmacology, Faculty of Health Sciences, WF Mollentze --- Department of Internal Medicine, Faculty of Health Sciences, JS Snyman --- Department of Pharmacology University of Pretoria;, G Joubert --- Department of Biostatistics, Faculty of Health Sciences,Objectives: The study was undertaken to investigate the role of private general practitioners (GPs) in the treatment of alcohol dependence in the Free State province. -
Knowledge and attitude of Nigerian personnel working at Federal Medical Centre in Nigeria on carbon monoxide poisoning from electrical power generators
Item type: Journal Article • Journal: South African Family Practice • Authors: Jide Afolayan --- Department of Anaesthesia, Nigeria Tokunbo Olajumoke --- Department of Anaesthesia, Nigeria Federick Amadasun --- Department of Anaesthesia, Nigeria Theodore Isesele --- Department of Anaesthesia, NigeriaBackground: Private portable electrical power generators are common household items in Nigeria owing to inadequate electrical power provision for the public. These engines often run indoors, emitting poisonous carbon monoxide gas. Fatalities are commonly reported as a result of carbon... -
Anti-allergic ophthalmic drugs in general practice: which, why and when?
Item type: Journal Article • Journal: South African Family Practice • Authors: N Mohamed --- Division of Ophthalmology, Faculty of Health Sciences, DP Smit --- Division of Ophthalmology, Faculty of Health Sciences,Ocular allergies present in many different guises. They may vary from self-limiting episodes of acute allergic conjunctivitis, to potentially sight-threatening chronic conditions, such as vernal keratoconjunctivitis. This article provides a brief description of the different ocular allergic conditions to aid... -
Dealing with major depression in general practice
Item type: Journal Article • Journal: South African Family Practice • Authors: CP Freeman --- Department of Psychiatry and Mental Health, JA Joska --- Department of Psychiatry and Mental Health,One in ten South Africans will be diagnosed with major depressive disorder (MDD) at some point in their lives. MDD is a potentially disabling condition that affects many spheres of an individual's life and leads to marked social and occupational... -
“An African way of doing things”: reproducing gender and generation
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Nolwazi Mkhwanazi --- Department of Anthropology, South AfricaIn this article I draw on ethnographic research conducted in the townships of Nyanga East and Khayelitsha, South Africa, to suggest a link between normative ideals about the relations between children and adults, normative practises around the care of children,... -
HIV risk after release from prison: a pilot case-control study in Canada, France, Ivory Coast and South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Evelyne Vallières --- LICEF, Canada Karl Peltzer --- Human Sciences Research Council, South Africa Rémi Dongo Kouabenan --- Université Pierre Mendès France, France Denis Dagou Koménan --- Université Félix Houphouët-Boigny Cocody, Ivory Coast Sid Abdellaoui --- Université de Paris, France François Joseph Azoh --- École normale supérieure, Ivory Coast Pierre McDuff --- Université de Montréal, Canada Jacques Bergeron --- Université de Montréal, Canada Safiétou MBaye --- Électricité de France (EDF), FranceThis study aimed to assess HIV knowledge, risk perception and risk behaviour of ex-offenders at risk of new infection and to compare them with the general population. A case-control interview study was conducted with conveniently sampled ex-offenders and persons with... -
Perceptions of sugar mommy practices in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Nancy Phaswana-Mafuya --- Human Sciences Research Council, South Africa Olive Shisana --- Human Sciences Research Council, South Africa Adlai Davids --- Human Sciences Research Council, South Africa Cily Tabane --- University of the Witwatersrand, South Africa Margaret Mbelle --- Human Sciences Research Council, South Africa Gladys Matseke --- Human Sciences Research Council, South Africa Mercy Banyini --- University of Venda, South Africa Queen KekanaThe study sought to explore sugar mommy practices regarding their occurrence, acceptability as well as perceived reasons why older women and younger men enter into sugar mommy relationships. An exploratory qualitative study involving 135 participants from 11 diverse focus groups... -
Psychological strengths and subjective well-being in South African white students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Leon T. B. Jackson --- North-West University, South Africa Fons J. R. van de Vijver --- North-West University, South Africa Runél Fouché --- North-West University, South AfricaThis study investigated the role of individual resources, notably self-efficacy, gratitude, and hope, in subjective well-being of white dormitory students at a historically white institution of higher learning. Using a convenience sample of white students (N = 227), we tested the role... -
Generational inversions: ‘working’ for social reproduction amid HIV in Swaziland
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Casey Golomski --- Department of Anthropology, South AfricaHow do people envision social reproduction when regular modes of generational succession and continuity are disrupted in the context of HIV/AIDS? How and where can scholars identify local ideas for restoring intergenerational practices of obligation and dependency that produce mutuality... -
The infrastructural passions of urban mutuality
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Christine Hentschel --- Institute for Criminological Research, GermanyThe article suggests an “infrastructural” approach to mutuality in the city. What organises mutuality is less a matter of the common urban horizon or the grown community than of “enabling conditions” (Calhoun) we would call infrastructures: their makeup shapes how... -
On the ranks of Fi22
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Faryad Ali --- Department of Mathematics, Saudi ArabiaIf G is a finite group and X a conjugacy class of elements of G, then we define rank(G:X) to be the minimum number of elements of X generating G. Moori investigated rank(Fi22:X), where X is a conjugacy class of... -
Generational forgiveness and historical injustices: perspectives of descendants of victims of Apartheid-era gross human rights violations in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Cyril K. Adonis --- Department of Interdisciplinary Research, College of Graduate Studies, South AfricaThis study explored the issue of generational forgiveness in the political sphere in contemporary South Africa. It is based on qualitative interviews conducted with 20 children and grandchildren (females = 10, males = 10) of victims of Apartheidera gross human rights violations. The interview... -
Two new genera and a new species in the holothurian family Cucumariidae (Echinodermata: Holothuroidea)
Item type: Journal Article • Journal: African Zoology • Authors: Ahmed S. Thandar --- University of Durban-Westville, South Africa Mageshnee Natasen Moodley --- University of Durban-Westville, South AfricaTwo new genera, Trachycucumis and Trachasina, in the holothurian family Cucumariidae, are described. The former is erected to accommodate a new southern African cucumariid, here described as T. plettenbergi, from the southeast coast of South Africa, and the Trachythyone sp... -
Patterns of millipede (Diplopoda), centipede (Chilopoda) and scorpion (Scorpionida) diversity in savanna habitats within the Greater Makalali Conservancy, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Dave Druce --- University of KwaZulu-Natal, South Africa Michelle Hamer --- University of KwaZulu-Natal, South Africa Rob Slotow --- University of KwaZulu-Natal, South AfricaAlthough savanna is one of the most important biomes in southern Africa, it is, apart from the botanical component, one of the least studied. This study aimed to document the distribution patterns, richness and diversity of selected ground-dwelling, flightless arthropods... -
A Comparison of the General Anti-Avoidance Provisions in the Australian and South African Income Tax Acts With Reference to Whether or Not the South African Anti-Avoidance Provisions Would Have Been Applicable to the Facts of FCT v Spotless Services Limited
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: D A Warneke --- Department of Accounting (Tax Section),The decision of the Australian Courts in the case of FCT v Spotless Services Limited was cause for considerable concern among the ranks of the Australian tax fraternity. The decision hinged on an application of the general anti-avoidance provisions (contained... -
Differential corporate reporting: Registered accountants’ and auditors’ views in South Africa
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: L J Stainbank --- School of Accounting, M J C Wells --- School of Accounting,This paper reports the results of a postal survey of South African Registered Accountants’ and Auditors’ views on the suitability of selected South African Statements of Generally Accepted Accounting Practice to a range of South African entities varied by size,... -
Capitalisation of borrowing costs: An investigation into technical uncertainties in IAS 23
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: L van Staden --- School of Accounting Sciences, N van der Merwe --- School of Accounting Sciences,Those who are not experts in the field of accounting will most probably be of the opinion that interest should be expensed and therefore reduce profits. However, for financial periods beginning on or after 1 January 2009, the capitalisation of... -
Basic Financial Statements: Objectives, Categories, Principles and Presentation
Item type: Journal Article • Journal: De Ratione • Authors: J.A. Miller --- University of Natal,Objectives ae suggested for each of the basic financial statements in the annual report of a business entity. Categories of information required and the principles used in their classification, are identified and defined. A suggested presentation reflects cash flow alongside... -
Accounting Issues Task Force
Item type: Journal Article • Journal: De Ratione • Authors: G K Everingham --- University of Cape Town,This article reviews the authority of the recently constituted Accounting Issues Task Force in relation to the development of generally accepted accounting practice (GAAP) in South Africa, The Task Force’s first opinion, AC301, deals with the accounting treatment of taxation... -
Endotracheal tube cuff pressures in adult patients undergoing general anaesthesia in two Johannesburg academic hospitals
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: L Gilliland --- Faculty of Health Sciences, Department of Anaesthesiology, South Africa H Perrie --- Faculty of Health Sciences, Department of Anaesthesiology, South Africa J Scribante --- Faculty of Health Sciences, Department of Anaesthesiology, South AfricaBackground: Endotracheal tube (ETT) cuff pressure commonly exceeds the recommended range of 20–30 cm H₂O during anaesthesia. A set volume of air will not deliver the same cuff pressure in each patient and the pressure exerted by the ETT cuff can... -
Kelp gulls prey on the eyes of juvenile Cape fur seals in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AJ Gallagher --- Leonard and Jayne Abess Center for Ecosystem Science and Policy, USA ER Staaterman --- Rosenstiel School of Marine and Atmospheric Sciences, USA N Dreyer --- Sandwich Harbour 4×4, NamibiaThe kelp gull Larus dominicanus is an abundant and highly successful avian predator and scavenger that breeds along the coastline in the Southern Hemisphere, ranging from Antarctica to the tropics. On account of its dietary breadth, wide-ranging foraging strategies, and... -
Assessment of noise pollution from electricity generators in a high-density residential area
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Nwasinachi U. Menkiti --- Centre for Environmental Management and Control, Nigeria Jonah C. Agunwamba --- Centre for Environmental Management and Control, NigeriaNoise pollution associated with household electricity generators is an emerging environmental degradation in many developing nations. The aim of this study is to evaluate noise pollution from the use of household electricity generators in a high-density residential area. A survey... -
Modelling dominant height growth in plantations of Pseudotsuga menziesii (Mirb.) Franco in Spain
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Carlos A López-Sánchez --- Instituto de Silvicultura e Industria de la Madera, México Juan G Álvarez-González --- Departamento de Ingeniería Agroforestal, Escuela Politécnica Superior, Spain Ulises Diéguez-Aranda --- Departamento de Ingeniería Agroforestal, Escuela Politécnica Superior, Spain Roque Rodríguez-Soalleiro --- Departamento de Producción Vegetal, Escuela Politécnica Superior, SpainA model for predicting dominant height growth and site index of Pseudotsuga menziesii (Mirb.) Franco in Spain was constructed. Data from stem analysis of 117 site trees were used. Four dynamic equations using the algebraic difference approach (ADA) and its... -
Chemotaxonomic investigation of phytoplankton in the shelf ecosystem of the KwaZulu-Natal Bight, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RG Barlow --- Bayworld Centre for Research and Education, South Africa T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa M-J Gibberd --- Marine Research Institute and Department of Oceanography, South Africa M van den Berg --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa K Britz --- Branch: Oceans and Coasts, Department of Environmental Affairs, South AfricaPhytoplankton community structure was elucidated during summer and winter in the KwaZulu-Natal Bight using pigment and CHEMTAX analyses. The surface pattern in January 2010 indicated that diatoms, haptophytes and prasinophytes tended to be the most prominent groups inshore and in... -
Environmental influence on phytoplankton production during summer on the KwaZulu-Natal shelf of the Agulhas ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa RG Barlow --- Bayworld Centre for Research and Education, South AfricaDuring February 2010, studies of primary production (PP) and physiology were conducted at five selected sites in the KwaZulu-Natal (KZN) Bight of the Agulhas ecosystem as part of a programme to elucidate the influence of major physical driving forces and... -
The Shockley five-parameter model of a solar cell: A short note
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: H.A. Koffi --- Department of Physics, Ghana A. Kuditcher --- Department of Physics, Ghana V.C.K. Kakane --- Department of Physics, Ghana E.A. Armah --- Department of Physics, Ghana A.A. Yankson --- Department of Physics, Ghana J.K.A. Amuzu --- Department of Physics, GhanaThis paper is concerned with an alternative formulation of the Shockley five-parameter model of a solar cell. This formulation leads to an explicit relationship between the short-circuit current and the light-generated current and the direct determination of the light-generated current... -
Classification of unregulated landfills by waste stream analysis method, a case of Chief Albert Luthuli Municipality, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Fannie Machete --- Department of Environmental Health, South Africa Karabo Shale --- Department of Environmental Health, South AfricaThe characterisation of unregulated landfills as general landfills is misleading particularly because these landfills are used to dispose of a mixed stream of general and hazardous waste. Unregulated landfills are unlicensed on-land waste disposal facilities that are not designed, constructed... -
Total tree, merchantable stem and branch volume models for miombo woodlands of Malawi
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Daud J Kachamba --- Department of Ecology and Natural Resource Management, Norway Tron Eid --- Department of Ecology and Natural Resource Management, NorwayThe objective of this study was to develop general (multispecies) models for prediction of total tree, merchantable stem and branch volume including options with diameter at breast height (dbh) only, and with both dbh and total tree height (ht), as... -
Strengthening primary health care through primary care doctors: the design of a new national Postgraduate Diploma in Family Medicine
Item type: Journal Article • Journal: South African Family Practice • Authors: R Mash --- Division of Family Medicine and Primary Care, Republic of South Africa Z Malan --- Division of Family Medicine and Primary Care, Republic of South Africa K von Pressentin --- Division of Family Medicine and Primary Care, Republic of South Africa J Blitz --- Division of Family Medicine and Primary Care, Republic of South AfricaStrengthening primary health care is a national priority in South Africa, in order to improve quality of care and health outcomes, reduce inequity and to pave the way for National Health Insurance. The World Health Organization and World Health Assembly... -
Inferring population trends of Araucaria angustifolia (Araucariaceae) using a transition matrix model in an old-growth forest
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Giovani F Paludo --- Grupo Uso e Conservação dos Recursos Florestais, Brazil Miguel B Lauterjung --- Grupo Uso e Conservação dos Recursos Florestais, Brazil Maurício S dos Reis --- Núcleo de Pesquisas em Florestas Tropicais, Brazil Adelar Mantovani --- Grupo Uso e Conservação dos Recursos Florestais, BrazilMatrix population models may generate important information to prevent undesirable outcomes for endangered species. This is the case for Araucaria angustifolia, a Critically Endangered conifer, with little knowledge regarding its life history and trends in development over time. This study... -
Fuel properties comparison of species of microalgae and selected second-generation oil feedstocks
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Andrew C. Eloka-Eboka --- Discipline of Mechanical Engineering, South Africa Chiemela Onunka --- Discipline of Mechanical Engineering, South AfricaComparative investigation and assessment of microalgal technology as a biodiesel production option was studied alongside other second generation feedstocks. This was carried out by comparing fuel properties of species of Chlorella vulgaris, Duneliella spp., Synechococus spp. and Senedesmus spp. with... -
A proportional integral synthesis for a variable speed wind energy conversion system using a permanent magnet synchronous generator
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Francis-Daniel Menga --- Department of Renewable Energy, Cameroon Noël Djongyang --- Department of Renewable Energy, Cameroon Danwé Raïdandi --- Department of Renewable Energy, Cameroon Réné Tchinda --- LISIE, CameroonA wind energy conversion system applied to battery charge is proposed in this paper. A permanent magnet synchronous generator (PMSG) is used as a variable speed generator in the proposed system. In order to extract the maximum power, the generator... -
The needs and preferences of general practitioners regarding their CPD learning: a Free State perspective
Item type: Journal Article • Journal: South African Family Practice • Authors: Johan Botes --- Department of Family Medicine, South Africa Johan Bezuidenhout --- Division of Health Sciences Education, South Africa Wilhelm Johannes Steinberg --- Department of Family Medicine, South Africa Gina Joubert --- Department of Biostatistics, South AfricaBackground: The Health Professions Council of South Africa (HPCSA) requires all registered Health Practitioners in South Africa to complete accredited learning opportunities, and provide proof thereof. CPD is the chosen model, which focuses on holistic development of the professional. The... -
Sorghum production systems and constraints, and coping strategies under drought-prone agro-ecologies of Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Beyene A Amelework --- African Centre for Crop Improvement, South Africa Hussein A Shimelis --- African Centre for Crop Improvement, South Africa Pangirayi Tongoona --- West African Centre for Crop Improvement, College of Basic and Applied Sciences, Ghana Fentahun Mengistu --- Ethiopian Institute of Agricultural Research, Ethiopia Mark D Laing --- African Centre for Crop Improvement, South Africa Dawit Getnet Ayele --- School of Mathematics, Statistics and Computer Science, South AfricaSorghum is one of the most important cereal crops worldwide after wheat, rice, maize and barley. Examining the present socio-economic conditions of sorghum-producing farmers in different agro-ecologies in Ethiopia is of importance for the design of improvement strategies. The objectives... -
Lifetable demography and population growth of the rotifer Brachionus angularis in Kenya: influence of temperature and food density
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ogello --- Graduate School of Fisheries and Environmental Sciences, Japan H-J Kim --- Graduate School of Fisheries and Environmental Sciences, Japan K Suga --- Graduate School of Fisheries and Environmental Sciences, Japan A Hagiwara --- Graduate School of Fisheries and Environmental Sciences, JapanLifetable demography and reproductive traits of a Kenyan strain of the rotifer Brachionus angularis were investigated using individual and small batch culture approaches. The rotifer was identified morphologically before conducting studies at 20, 25 and 30 °C, using Chlorella vulgaris... -
Sharks caught in the KwaZulu-Natal bather protection programme, South Africa. 13. The tiger shark Galeocerdo cuvier
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Dicken --- KwaZulu-Natal Sharks Board, Umhlanga Rocks, South Africa G Cliff --- KwaZulu-Natal Sharks Board, Umhlanga Rocks, South Africa H Winker --- South African National Biodiversity Institute, South AfricaThe current study provides long-term catch rate and biological data for tiger sharks Galeocerdo cuvier caught in the KwaZulu-Natal bather protection programme. Between 1978 and 2014, 1 760 G. cuvier were caught in nets and between 2007 and 2014, 108... -
Health and well-being among teenage mothers in a rural South African community
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Jabu P. Mokwena --- Department of Psychology, Saraswathie Govender --- Department of Psychology, Mokgadi B. Setwaba --- Department of Psychology,This study sought to identify patterns of general health symptoms and coping abilities among school-going teenage mothers in the central region of Limpopo province, South Africa. The participants were 56 teenage mothers and 56 typically developing girls or non-mother peers... -
Development of an innovative eco-friendly rice puffing machine for modernizing a traditional cottage industry
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Manoj KR. Bhattacharyya --- RuTAG-EI (Rural Technology Action Group – Eastern India) IIT (Indian Institute of Technology), India Manjishtha Bhattacharyya --- Department of Zoology, IndiaTraditional enterprises are economically less viable although they impact the environment less adversely. Modern industries that have replaced traditional skills for mass manufacture of the same products are capital intensive and more polluting. A midway is essential that can upgrade... -
Generation Y's attitude towards organic wine
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Inkje Hoekstra --- Stenden University of Applied Sciences, The Netherlands Conrad Lashley --- Hospitality Studies, Stenden University of Applied Sciences, The Netherlands Elena Cavagnaro --- Sustainability in Hospitality & Tourism, Stenden University of Applied Sciences, The NetherlandsThis research paper focuses on the motives behind Generation Y's wine choices. Data collection was done by reviewing relevant literature, interviewing wine experts and organising blind and open wine tastings accompanied by questionnaires and focus group discussions. Results confirm that... -
On the self-convolution of generalized Fibonacci numbers
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Hacène Belbachir --- , Algeria Toufik Djellal --- , Algeria Jean-Gabriel Luque --- Normandie Université, Université de Rouen, FranceWe focus on a family of equalities pioneered by Zhang and generalized by Zao and Wang and hence by Mansour which involves self convolution of generalized Fibonacci numbers. We show that all these formulas are nicely stated in only one... -
Factors determining the occurrence of Pleurodeles poireti (Caudata: Salamandridae) on Edough Peninsula, northeastern Algeria
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Jihène Ben Hassine --- , , Tunisia Daniel Escoriza --- , , Spain Badis Bakhouche --- , , AlgeriaPleurodeles poireti is one of the lesser-known amphibians in the Mediterranean region. This species is strictly endemic to the Edough Peninsula in northeastern Algeria. Here we investigated the factors that determine the presence of P. poireti, by affecting its selection... -
Influences of stereotype and social distance on prejudice toward African Americans
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Ok-joo Choi --- Department of Social Welfare, South Korea Kyung-suk Lee --- Department of Counseling Psychology, South Korea Ki-tai Lee --- Department of Tourism Events and International Conferences, South Korea Joon-ho Kim --- Education Institute, South KoreaThe study sought to identify the influential factors of stereotypes, social distance, and prejudice toward racial/ethnic minorities in the United States. We used data from the American General Social Survey (GSS) of 2012, and analysed the data of 4 820... -
Estimating forest carbon stocks in tropical dry forests of Zimbabwe: exploring the performance of high and medium spatial-resolution multispectral sensors
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tawanda W Gara --- Department of Geography and Environmental Science, Zimbabwe Amon Murwira --- Department of Geography and Environmental Science, Zimbabwe Timothy Dube --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa Mbulisi Sibanda --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa Donald T Rwasoka --- Faculty of Geo-information Science and Earth Observation, The Netherlands Henry Ndaimani --- Department of Geography and Environmental Science, Zimbabwe Emmerson Chivhenge --- Department of Geography and Environmental Science, Zimbabwe Chipo M Hatendi --- Department of Geography and Environmental Science, ZimbabweEstimation and mapping of forest dendrometric characteristics such as carbon stocks using remote sensing techniques is fundamental for improved understanding of the role of forests in the carbon cycle and climate change. In this study, we tested whether and to... -
Overview of restoration and management practices in the degraded landscapes of the Sahelian and dryland forests and woodlands of East and southern Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Paxie W Chirwa --- Forest Science Postgraduate Programme, Department of Plant and Soil Sciences, South Africa Larwanou Mahamane --- African Forest Forum, c/o World Agroforestry Centre (ICRAF), KenyaThe highest deforestation and forest degradation rates in Africa occur in the dry forests and woodlands where pressure for land is increasing, poverty is rampant, livelihood options are few and climate change effects are severe. This paper examines factors that... -
An assessment of the forest regeneration potential of the taungya system of farming in Oyo State, south-western Nigeria
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ismail O Azeez --- Department of Forest Resources Management, Nigeria Labode Popoola --- Department of Forest Resources Management, Nigeria Idowu O Shulamite --- Department of Forest Resources Management, NigeriaBalancing forest regeneration and meeting food and fibre needs of Nigeria’s ever-increasing population challenges is imperative to her sustainable development. Two methods of artificial forest regeneration practiced in Oyo State, Nigeria to meet these challenges are direct planting and taungya... -
Forests, people and environment: some African perspectives
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Paxie W Chirwa --- Forest Science Postgraduate Programme, Department of Plant and Soil Sciences, South Africa Larwanou Mahamane --- African Forest Forum, c/o World Agroforestry Centre (ICRAF), Kenya Godwin Kowero --- African Forest Forum, c/o World Agroforestry Centre (ICRAF), KenyaForests in Africa support the livelihoods of millions of people through provision of timber and non-timber forest products, food and nutrition, energy and payment of environmental services. However, mismanagement of forests has resulted in deforestation and forest degradation, thereby contributing... -
Grazing management that regenerates ecosystem function and grazingland livelihoods
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Richard Teague --- Department of Ecosystem Science and Management, USA Matt Barnes --- Shining Horizons Land Management LLC, USAAdopting a systems view and regenerative philosophy can indicate how to regenerate ecosystem function on commercial-scale agro-ecological landscapes. Adaptive multi-paddock grazing management is an example of an approach for grazinglands. Leading conservation farmers have achieved superior results in ecosystem improvement,... -
Relationship between somatic growth and otolith growth: a case study of the ornate jobfish Pristipomoides argyrogrammicus from the coast of Réunion (SW Indian Ocean)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Mahé --- Ifremer, Fisheries Laboratory, Sclerochronology Centre, France Y Aumond --- Ifremer, Le Port, France K Rabhi --- Ifremer, Fisheries Laboratory, Sclerochronology Centre, France R Elleboode --- Ifremer, Fisheries Laboratory, Sclerochronology Centre, France E Bellamy --- Ifremer, Laboratoire Environnement Ressources Languedoc Roussillon, France J Huet --- Ifremer, Le Port, France M Gault --- FRS Marine Laboratory, Scotland D Roos --- Ifremer, Le Port, FranceThe ornate jobfish Pristipomoides argyrogrammicus Valenciennes 1832 occurs in the Indo-West Pacific Ocean, where it is harvested by small-scale coastal fisheries. Management of this species is hindered by lack of adequate biological data. We sampled a total of 113 individuals... -
The contribution of creative industries to sustainable urban development in South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Oluwayemisi Adebola Oyekunle --- Tshwane University of Technology, Faculty of The Arts, South AfricaSouth African policymakers are increasingly advocating for creative industry entrepreneurship to play a vital role in the economic development of cities, for example, by creating pathways for job creation and encouraging urban regeneration. The question, ‘How can we use creative... -
Genetic parameters and genotype by environment interaction of Eucalyptus grandis populations used in intraspecific hybrid production in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Gert J van den Berg --- Mondi Forests (Pty) Ltd, South Africa Steven D Verryn --- , South Africa Paxie W Chirwa --- Faculty of Natural and Agricultural Sciences, South Africa Francois van Deventer --- Mondi Forests (Pty) Ltd, South AfricaIn South Africa, Eucalyptus grandis is an important species due to its fast growth and general suitability of its timber for a range of products. However, E. grandis is susceptible to fungal diseases such as Crysoporthe austroafricana and Coniothyrium sp... -
Modelling and performance of an automated small hybrid plant
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Samuel Ilupeju --- Discipline of Mechanical Engineering, Durban, South Africa Freddie Inambao --- Discipline of Mechanical Engineering, Durban, South Africa Yetunde Ilupeju --- Discipline of Mechanical Engineering, Durban, South Africa Taha Selim Ustun --- Electrical Engineering, Carnegie Mellon University, USASmall rivers that can generate useful quantities of electricity are freely and proportionally distributed in Africa. Thousands of potential sites are available in South Africa, capable of generating hundreds of megawatts. Small hydropower generation is not a new approach in... -
Feasibility of electricity generation using WECS in the selected locations of Tigray region (Ethiopia)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Shiva Prashanth Kumar Kodicherla --- Department of Civil Engineering, College of Engineering & Technology, Ethiopia Satyanarayana Gaddada --- Department of Electrical and Computer Engineering, College of Engineering & Technology, EthiopiaThis paper presents the feasibility of electricity generation using WECS in the selected locations of Tigray region in Ethiopia. Weibull parameters were obtained using the energy pattern factor method (EPFM). A linear agreement was observed between mean wind speed and... -
Assessment of noise-levels of generator-sets in seven cities of South-Southern Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Osagie Ibhadode --- Building Research Department, Nigeria I. T. Tenebe --- Department of Civil Engineering, Nigeria P. C. Emenike --- Department of Civil Engineering, Nigeria O. S. Adesina --- Dept. of Mathematical Science, Nigeria A. F. Okougha --- Science Laboratory Technology Research Department, Nigeria F. O. Aitanke --- Department of Production Engineering, NigeriaNoise pollution has been shown to be a global health hazard and this could be aggravated by the use of noise-emitting generators. Therefore, this study aims to determine the Sound Pressure Levels Sound Power Levels as well as Noisiness of... -
Contemporary institutional solid waste management practices of Haramaya University, Eastern Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ashenafi Yimam Kassaye --- School of Geography and Environmental Studies, EthiopiaEven though waste products arise from our ways of life and are generated at every stage of the process of production and development, the type of decision making that leads to adequate solid waste management requires a sound understanding of... -
A phylogeny and genus-level revision of the African file snakes Gonionotophis Boulenger (Squamata: Lamprophiidae)
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Donald G. Broadley --- , Zimbabwe Krystal A. Tolley --- , South Africa Werner Conradie --- , South Africa Sarah Wishart --- , South Africa Jean-François Trape --- , Senegal Marius Burger --- , , South Africa Chifundera Kusamba --- , , République Démocratique du Congo Ange-Ghislain Zassi-Boulou --- , République du Congo Eli Greenbaum --- , , USAThe sub-Saharan African file snake genus Gonionotophis is currently comprised of 15 species. However, the concept of this genus has been confounded by morphological and genetic differences between the constituent taxa. Due to the dearth of DNA samples, a taxonomic... -
Simultaneous selection for multiple traits in sugarcane breeding populations using logistic regression models
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Marvellous Zhou --- South African Sugarcane Research Institute, South AfricaSimultaneous selection for multiple traits in plant breeding increases the value of cultivars to growers. Visual selection is inefficient while multivariate statistical analysis is too complicated for early stages. The objective of this study was to demonstrate logistic regression models... -
Sharks caught in the KwaZulu-Natal bather protection programme, South Africa. 14. The smooth hammerhead shark Sphyrna zygaena (Linnaeus)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ML Dicken --- KwaZulu-Natal Sharks Board, South Africa H Winker --- Branch: Fisheries Management, Department of Agriculture, South Africa MJ Smale --- Port Elizabeth Museum, South Africa G Cliff --- KwaZulu-Natal Sharks Board, South AfricaThe current study provides long-term catch-rate, biological and feeding data for smooth hammerhead sharks, Sphyrna zygaena, caught in South Africa’s KwaZulu-Natal bather protection programme. In total, 2 512 S. zygaena were caught in net installations between 1978 and 2014, and... -
Feasibility economic analysis for electricity generation in internal combustion engine sets using landfill gas in Lagos State
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: A. O. Adepoju --- Project Management Department, Nigeria Y. O. Akinwale --- Department of Economics, Saudi Arabia I. O. Ogundari --- African Institute for Science Policy and Innovation, Obafemi Awolowo University, NigeriaThe main objective of this paper is to analyze the economic feasibility landfill gas for electricity generation in Lagos State. In this paper, methane emissions are estimated by applying the First Order Decay model to landfills in Lagos over the... -
Whole-tree sap flow responses to soil water and weather variables for Pinus radiata and three indigenous species in a southern afrotemperate forest region
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tatenda Mapeto --- School of Natural Resources Management, Nelson Mandela University, George Campus, South Africa Josua Louw --- School of Natural Resources Management, Nelson Mandela University, George Campus, South Africa Mark Gush --- Council for Scientific and Industrial Research, South Africa Jeanette Pauw --- School of Natural Resources Management, Nelson Mandela University, George Campus, South AfricaIn a water-scarce country such as South Africa, timber and fibre production often stands in conflict with catchment water yields. The optimal provision of both is sought. Forest hydrological experiments improve our understanding of the soil–plant–atmosphere continuum and facilitate the... -
My generation: A review of marketing strategies on different age groups
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Emilie Slootweg --- Stenden Hotel School, The Netherlands Bill Rowson --- Stenden Hotel School, The NetherlandsAs the famous pop group, the Who, sang “My generation”, referring to the wants and needs of their fans and popular culture in the mid-1960s, change was in the air. In the early 21st century an ever more complex world... -
The autumn occurrence and spatial distribution of cetaceans in the waters of Mauritania during a geophysical survey in 2012
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Russell --- , United Kingdom A Sánchez-Cabanes --- , United Kingdom M Nimak-Wood --- , United KingdomThis study aimed to identify the occurrence and spatial distribution of cetaceans in Mauritanian waters (eastern Atlantic). A geophysical survey was conducted over 92 days between September and December 2012. Over 967 km was surveyed, with 1 017 h of... -
Distribution and habitat use of Indo-Pacific bottlenose dolphins Tursiops aduncus along the south coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: OA Vargas-Fonseca --- , South Africa SP Kirkman --- , South Africa D Conry --- , South Africa GM Rishworth --- , South Africa V Cockcroft --- , South Africa PA Pistorius --- , South AfricaThe distribution and habitat use of the Indo-Pacific bottlenose dolphin Tursiops aduncus along the south coast of South Africa was investigated using bi-monthly boat-based surveys, from 2013 to 2016, over a distance of 145 km between the Goukamma and Tsitsikamma... -
The economic cost of unreliable grid power in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Samuel Olowosejeje --- School of Engineering, Nigeria Paul Leahy --- School of Engineering, Republic of Ireland Alan Morrison --- Department of Electrical and Electronic Engineering, School of Engineering, Republic of IrelandThe ever-increasing demand for electrical power in Nigeria, coupled with a limited supply, have restricted the nation's socioeconomic development. The country’s policymakers, aware of this, have formulated and enacted energy development policies in recent years targeted at diversifying the current... -
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... -
Genomic resources for the spotted ragged-tooth shark Carcharias taurus
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JD Klein --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa AE Bester-van der Merwe --- Molecular Breeding and Biodiversity Group, Department of Genetics, South Africa ML Dicken --- KwaZulu-Natal Sharks Board, South Africa A Emami-Khoyi --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South Africa KL Mmonwa --- KwaZulu-Natal Sharks Board, South Africa PR Teske --- Centre for Ecological Genomics and Wildlife Conservation, Department of Zoology, South AfricaGenomic data can be a useful tool in the management and conservation of biodiversity. Here, we report the development of genomic resources for the spotted ragged-tooth shark Carcharias taurus using genome-wide DNA data from Illumina next-generation sequencing. We explored two... -
Land-use impacts on the composition and diversity of the Baikiaea– Guibourtia–Pterocarpus woodlands of north-western Zimbabwe
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Angella Chichinye --- Department of Forest Resources and Wildlife Management, Zimbabwe Coert J Geldenhuys --- Department of Plant and Soil Sciences, South Africa Paxie W Chirwa --- Department of Plant and Soil Sciences, South AfricaVariation in floristic composition of recovering Baikiaea–Guibourtia–Pterocarpus woodlands was studied in different development stages (from early regrowth to mature woodland) under different land-use systems (protected areas, timber harvesting, pole and firewood collection, and abandoned crop fields), in the Gwayi and... -
The perceptions of general practitioners on National Health Insurance in Chris Hani district, Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: Mthetheleli Mbongeni Gaqavu --- Division of Family Medicine and Primary Care, South Africa Robert Mash --- Division of Family Medicine and Primary Care, South AfricaBackground: National Health Insurance (NHI) intends to provide universal health coverage to all South Africans, with equity and quality as its tenets. The participation of private general practitioners (GPs) in NHI is essential. The aim was to explore perceptions of... -
Willingness to establish private forest plantations among households in Oyo State Nigeria
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: Sarafat Ayanfunke Tijani --- Department of Agricultural Extension and Rural Development, NigeriaThis study investigates the willingness of the respondents to establish private forest plantations (PFPs) in Oyo State, Nigeria. Two purposively selected and two randomly selected local government areas were used. One hundred and sixty household heads randomly selected were interviewed... -
Structure and diversity of the Araucaria forest in southern Brazil: biotic homogenisation hinders the recognition of floristic assemblages related to altitude
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lucia Sevegnani --- Departamento de Ciências Naturais, Brazil André L de Gasper --- Departamento de Ciências Naturais, Brazil Arthur V Rodrigues --- Programa de Pós-Graduação em Engenharia Florestal, Brazil Débora V Lingner --- Departamento de Engenharia Florestal, Brazil Leila Meyer --- Programa de Pós-graduação em Ecologia e Evolução, Brazil Alexandre Uhlmann --- Embrapa Florestas, Brazil Laio Z Oliveira --- Departamento de Engenharia Florestal, Brazil Alexander C Vibrans --- Programa de Pós-Graduação em Engenharia Florestal, BrazilForest structure and species abundance may respond to environmental features triggered by geomorphology, altitude gradients and human impacts. In this study we investigated if data from a large-area inventory would support the segregation of floristic assemblages related to altitude-oriented forest... -
Livelihoods fragility and land tenure in the post-fast track land reform era in Upper Guruve, Zimbabwe
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Hardlife S. Basure --- Sociology and Social Anthropology, Zimbabwe Josiah Taru --- Sociology and Social Anthropology, Zimbabwe Gumisai T. Mutangi --- Sociology and Social Anthropology, ZimbabweThis paper seeks to document the experiences of and challenges experienced by farmers resettled according to the communal/villagised model of resettlement in Upper Guruve district in Zimbabwe. The paper is based on long-term ethnographic fieldwork conducted from 2009 to 2017... -
Goodwill impairment testing disclosures – South African compliance in 2018
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Charles Day --- Oxford Brookes Business School, United KingdomThis paper reviews compliance with the IAS 36 goodwill impairment testing disclosure requirements by South African entities included in the All Share Index of the Johannesburg Stock Exchange. A detailed extraction of disclosures provided by entities with material levels of... -
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FL Mbatha --- Department of Biological Sciences and Marine Research Institute, South Africa D Yemane --- Department of Biological Sciences and Marine Research Institute, South Africa M Ostrowski --- Institute of Marine Research (IMR), Norway CL Moloney --- Department of Biological Sciences and Marine Research Institute, South Africa MR Lipiński --- Department of Ichthyology and Fisheries Science, South AfricaGeneralised additive models (GAMs) were applied to survey data to assess the influence of dissolved oxygen, water temperature and year of sampling upon the presence/absence of small (≤15 cm TL), medium (16–34 cm TL) and large (≥35 cm TL) size... -
Optimization of the production and storage of cold in a mechanical compression solar refrigerator
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Adingra Paul Arsène Kouassi --- Laboratoire d’Energie Solaire, Unité de Formation et de Recherche des Sciences des Structures de la Matière et Technologie, Côte d’Ivoire Siaka Touré --- Laboratoire d’Energie Solaire, Unité de Formation et de Recherche des Sciences des Structures de la Matière et Technologie, Côte d’Ivoire Wanignon Ferdinand Fassinou --- Laboratoire d’Energie Solaire, Unité de Formation et de Recherche des Sciences des Structures de la Matière et Technologie, Côte d’IvoireDesign, optimization and realization of high-performance photovoltaic systems are topical issues. Especially in photovoltaic solar refrigeration machines, the cost and the lifetime of electrochemical batteries limit the development of these systems in places well served by solar radiation. The objective... -
The influence of host dispersal on the gene flow and genetic diversity of generalist and specialist ectoparasites
Item type: Journal Article • Journal: African Zoology • Authors: Conrad A Matthee --- , South AfricaThe dispersal and subsequent gene flow within parasite species is the result of a complex interaction between parasite life history, host life history and abiotic environmental factors. To gain more insights into the drivers responsible for parasite dispersal, COI mtDNA... -
A dwarf among giants: phylogenetic position of the elusive Angolan Adder (Bitis heraldica) and biogeographic affinities of Angolan Afromontane regions
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Luis MP Ceríaco --- Museu de História Natural e da Ciência da Universidade do Porto, Portugal Krystal A Tolley --- South African National Biodiversity Institute, Kirstenbosch Research Centre, South Africa Mariana P Marques --- Research Center in Biodiversity and Genetic Resources (CIBIO), Research Network in Biodiversity and Evolutionary Biology (InBIO), University of Porto, Portugal Matthew P Heinicke --- Department of Natural Sciences, University of Michigan-Dearborn, USA Aaron M Bauer --- Department of Biology and Center for Biodiversity and Ecosystem Stewardship, Villanova University, USAThe Angolan Adder, Bitis heraldica (Bocage, 1889), is endemic to the Angolan central plateau and is one of the most poorly known and rarely observed species of African snakes. The phylogenetic placement of B. heraldica within the four subgenera of... -
Determination of the series resistance of a solar cell through its maximum power point
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: H. A. Koffi --- , Accra, Ghana A. A. Yankson --- , Accra, Ghana A. F. Hughes --- , Accra, Ghana K. Ampomah-Benefo --- , Accra, Ghana J. K. A. Amuzu --- , Accra, GhanaA simple analytical approach has been developed to determine the series resistance, R s, of a solar cell. The method adopted here depends only on the knowledge of the open-circuit voltage, V oc, and the current and voltage at the... -
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... -
Development and testing of volume models for Pinus nigra Arn., Fagus sylvatica L., and Quercus pubescens Willd.
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Dimitrios I Raptis --- , Greece Vassiliki Kazana --- , Greece Angelos Kazaklis --- , Greece Christos Stamatiou --- , GreeceVolume models were developed and tested for Pinus nigra Arn., Fagus sylvatica L., and Quercus pubescens Willd. to accurately predict the woody stem volume at tree level, since despite the economic importance of these species in the Mediterranean type of... -
Natural regeneration status and soil seed bank composition in IITA Forest Reserve, Ibadan, Oyo State, Nigeria
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Bright Danso Appiagyei --- , Nigeria Akinyele O Adejoke --- , NigeriaThe International Institute of Tropical Agriculture (IITA) Forest Reserve is a secondary rainforest that has been protected since 1965. It serves as a refuge for many species that were once common but have declined, due to urbanisation and population pressure... -
Assessing the impact of climate change on crop production in southern Africa: a review
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AC Franke --- , South AfricaThis paper provides a systematic review of studies assessing the impact of climate change on crop yields in southern Africa. Moreover, it synthesises the current knowledge of the impact of elevated ambient CO2 levels (eCO2) and temperatures on physiological processes,... -
Wind and solar power deployment in India: Economic aspects and policy implications
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Alok Das --- , India Hardik K. Jani --- , India Garlapati Nagababu --- , India Surendra Singh Kachhwaha --- , IndiaEconomic assets play a key role in the growth of renewable power projects and depend on financial scenarios and policy structures offered by government policies. The focus of the study is to assess the impact of the existing economic scenarios... -
Does the elderly’s private pension ownership intensify aggregate equity demand? Empirical evidence in the US
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Sei-Wan Kim --- , Korea Young-Min Kim --- , Korea Dennis W. Jansen --- , USA Lu Yanxin --- , KoreaIn this paper, we investigate how the old generation income structure affects aggregate equity purchases, using Flows of Funds Accounts and Survey of Consumer Finances. Our results suggest that the risk aversion that increases with age could be modified to... -
Caregivers of early adolescent children: Influences of their apartheid experiences on their intergenerational learning practices
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Jené Pretorius --- , South Africa Carinne Annfred Lorraine Petersen --- , South Africa Athena Pedro --- , South AfricaThis study aimed to explore the experiences of apartheid that South African caregivers share with their early-adolescent children. Utilising a qualitative exploratory inquiry approach, we interviewed eight participants (male = 1; age range: 29–55 years old; black = 3; coloured... -
Emotional labour influences on psychological health: The moderating role of religiosity
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Collins Badu Agyemang --- , GhanaThe present study examined the direct association between emotional labour and psychological health, and the moderating role of religiosity among media practitioners in Ghana. Using a cross-sectional design, 336 media practitioners (female = 31%) completed a survey on emotional labour... -
Combining ability of bread wheat genotypes for yield and yield-related traits under drought-stressed and non-stressed conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Yared Semahegn --- , South Africa Hussein Shimelis --- , South Africa Mark Laing --- , South Africa Isack Mathew --- , South AfricaDrought is a major cause of reduced yields in dryland wheat production. This study aimed to determine the combining ability effects of selected bread wheat genotypes (Triticum aestivum L.) for yield and yield-related traits. Eight parental lines were selected and... -
Grade 12 performance and academic performance in first-year psychology students: Influences of generational status and academic self-concept
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Lené Groenewald --- , South Africa Luzelle Naudé --- , South Africa Karel Esterhuyse --- , South AfricaWe examined the relationship between students’ Grade 12 achievement and their first-year academic performance and the potential moderating and/or mediating roles of generational status and academic self-concept in this relationship. Participants were 203 students (female = 82.8%; black African =73.9%;... -
Blaming the father: witchcraft, de-industrialisation and generation in South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Isak Niehaus --- , United KingdomSocial researchers associate paradoxical developments in post-apartheid South Africa — such as increased hardship at a time of heightened expectations — with a proliferation in witchcraft accusations. This article examines this postulate in greater depth, drawing upon multi-temporal ethnographic fieldwork... -
Understanding general pedagogical knowledge influences on sustainable teacher well-being: A qualitative exploratory study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Irma Eloff --- , South Africa Ann-Kathrin Dittrich --- , AustriaThis qualitative reconstructive study aimed to explore teacher general pedagogical knowledge and professional well-being. The informants were a convenience sample of 18 teachers from Austrian primary schools (n = 5), lower secondary schools (n = 7), and upper secondary schools... -
Local variations in the response of birds to human presence in urban areas
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Tristan Nyatanga --- , Zimbabwe Henry Ndaimani --- , South Africa Tanyaradzwa Gaza --- , ZimbabweStudies that seek to understand the local variations in the response of birds to human disturbance in urban areas are important for conservation. This article investigated the contribution of human population density in the different urban land use zones of... -
Post-fire tree regeneration from seed of the endangered Nothofagus alessandrii Espinosa in the Maule region of central Chile
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Persy Gómez --- , Chile Sergio Espinoza --- , Chile Pedro Garrido --- , Chile José San Martín --- , Chile Yony Ormazábal --- , ChileThe endemic ruil (Nothofagus alessandrii Espinosa) forest is one of the most endangered forest ecosystems in central Chile, where its regeneration is challenged by factors such as low seedling germination capacity and recently by fire. In this study, we sampled... -
Variation of the relationships between lengths and weights applied to 123 fish species observed at Réunion Island (Indian Ocean)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Roos --- , Réunion J Taconet --- , Réunion C Gentil --- , Réunion B Brisset --- , Réunion H Evano --- , Réunion Y Aumond --- , Réunion J Huet --- , Réunion C Lepetit --- , Réunion R Boymond-Morales --- , Réunion T Rungassamy --- , Réunion R Elleboode --- , France K Mahé --- , FranceBody length–weight (L–W) relationships of 123 fish species (122 Actinopterygii and 1 Elasmobranchii) were studied from 10 218 individuals caught around Réunion Island from 2000 to 2021. All species, except for 4 with a very small number of individuals and... -
Diet of a generalist mammalian mesocarnivore in an urban matrix
Item type: Journal Article • Journal: African Zoology • Authors: Jarryd P Streicher --- , South Africa Melanie B Streicher --- , South Africa Tharmalingam Ramesh --- , South Africa Colleen T Downs --- , South AfricaAnthropogenic habitat conversion through urban sprawl is driving mesocarnivores to modify their behaviour and ecology. Thorough knowledge of their feeding ecology is fundamental in understanding the pressures imposed on mesocarnivores by urbanisation. The diet of the water mongoose Atilax paludinosus... -
Nematode community structure and distribution along the Kenyan continental shelf
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SM Hashim --- University of Nairobi, Kenya AWN Muthumbi --- University of Nairobi, Kenya JM Githaiga --- University of Nairobi, Kenya J Okondo --- Kenya Marine and Fisheries Research Institute (KMFRI), KenyaMeiofauna communities were analysed from samples collected at four stations on the Kenyan continental shelf (Shimoni, Kwale, Mombasa and Kilifi) during the maiden cruise of the RV Mtafiti, 12–21 December 2015. Nematodes were identified to genus level, and their distribution... -
Habitat selection and foraging preference of the endangered addax (Addax nasomaculatus) in a fenced wildlife reserve within its historic range: insights for supporting effective reintroduction
Item type: Journal Article • Journal: African Zoology • Authors: Mohsen Chammem --- , Tunisia Hicham Seri --- , Tunisia Rita Bastos --- , Portugal Mário Santos --- , Portugal Joana Vicente --- , Portugal Touhami Khorchani --- , Tunisia João Alexandre Cabral --- , PortugalReintroduction of species should be based on ecological knowledge, which is fundamental to enhancing the probability of success, but also in predicting the response to future changing landscapes. The addax (Addax nasomaculatus), an endangered antelope whose ecology is mostly unknown,... -
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. -
A characterisation of weightable quasi-metric generating functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dhananjay Gopal --- Guru Ghasidas Vishwavidyalay, India Oscar Valero --- University of Balearic Islands, Spain Shubham Yadav --- S.V. National Institute of Technology, IndiaIn 1994, S.G. Matthews introduced the notions of partial metric and weighted quasi-metric and, in addition, he showed that both are dual. In fact, he developed a method for generating weightable quasi-metrics from partial metrics and conversely. Recently, J.J. Miñana... -
On some properties of generalized Narayana numbers
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dmitry Kruchinin --- Tomsk State University of Control Systems and Radioelectronics, Russia Vladimir Kruchinin --- Tomsk State University of Control Systems and Radioelectronics, Russia Yuriy Shablya --- Tomsk State University of Control Systems and Radioelectronics, RussiaIn this paper, we consider a three-parameter generalization of the Narayana numbers that is related to the powers of the generating function for the Narayana numbers. We find a multivariate generating function for these generalized Narayana numbers. For the composition... -
An assessment of government policy response to HIV/AIDS in Ghana
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Julius Fobil --- School of Public Health, University of Ghana, Ireneous Soyiri --- School of Public Health, University of Ghana,The HIV/AIDS epidemic in Africa has assumed a dimension raising heartbreaking anxiety among national governments and civil society groups. In Ghana for example, the pandemic is well-documented and has gone beyond a health problem, and now encompasses all socio-economic aspects... -
Challenges impacting on the quality of care to persons living with HIV/AIDS and other terminal illnesses with reference to Kanye community home-based care programme
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Simon M Kang'ethe --- Skill Share International,HIV/AIDS has been found to be a challenging disease to humanity, its challenge spin-offs falling especially on to the caregivers of those infected and affected by the virus. This paper aims to discuss the challenges influencing the state of caregiving... -
Taxi ‘sugar daddies’ and taxi queens: Male taxi driver attitudes regarding transactional relationships in the Western Cape, South Africa
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Cheryl Potgieter [d53e18] Anna Strebel Tamara Shefer Claire WagnerMedia reports are emerging on the phenomenon of young girls who travel with older mini-bus taxi drivers, and who are thought to have sex with the drivers in exchange for gifts and money. The extent to which such relationships might... -
A model to understand HIV-related stigma and the psychosocial well-being of children orphaned by AIDS: a theory generative approach
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Z. Yassin --- University of the Western Cape, South Africa C. Erasmus --- University of the Western Cape, South Africa J. Frantz --- University of the Western Cape, South AfricaHIV-related stigma has negatively impacted the psychosocial well-being of children who have been orphaned by AIDS-related causes. Response to reducing stigma and ensuring child well-being is hindered by the limited understanding of HIV-related stigma and how it affects the psychosocial... -
Generation glands and sexual size dimorphism in the Cape Crag Lizard, Pseudocordylus microlepidotus
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: P. le FrasN. Mouton --- University of Stellenbosch, South Africa Carmen Gagiano --- University of Stellenbosch, South Africa Beate Sachse --- University of Stellenbosch, South AfricaThe Cape Crag Lizard, Pseudocordylus microlepidotus, is unique among cordylid lizards in that generation glands are not restricted to the femoral region, but also occur on the dorsum and in the inguinal region. We analysed 274 museum specimens of P... -
Multi-generational workforce job retention: Coping strategy influences among South African engineers
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Samantha Samuel --- University of South Africa, South Africa Nadia Ferreira --- University of South Africa, South AfricaThis study investigated the relationship between generational cohorts and job retention as influenced by coping strategies. Participants were a convenience sample of 151 full-time South African engineers (Generation X: 1961 to 1980 = 47.7%; white = 66.9%; male = 89.4%)... -
An investigation into the normal tax implications of fractional share rights in South Africa
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Christoff Botha --- Stellenbosch University, South Africa Cecileen Greeff --- Stellenbosch University, South AfricaA recent development in the financial service industry is the introduction of the fractional share right that allows a retail investor to invest in a fraction of a listed equity share. Fractional share right is not defined in the Income... -
Lie triple centralizers on generalized matrix algebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Behrooz Fadaee --- University of Kurdistan, Iran Hoger Ghahramani --- University of Kurdistan, Iran Wu Jing --- Fayetteville State University, USAIn this article, we introduce the notion of Lie triple centralizer as follows. Let be an algebra, and be a linear mapping. We say that ϕ is a Lie triple centralizer whenever for all . Then we characterize the general... -
The W -weighted BT inverse
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: D.E. Ferreyra --- Universidad Nacional de Río Cuarto, Argentina N. Thome --- Instituto Universitario de Matemática Multidisciplinar, Universitat Politècnica de València, Spain C. Torigino --- Universidad Autónoma de Entre Ríos, ArgentinaIn this paper we extend the definition of BT inverse of square complex matrices to rectangular matrices. This new generalized inverse (called the W -weighted BT inverse) always exists and is unique. We investigate several characterizations of the W -weighted... -
Further investigations on the two variables second Appell hypergeometric matrix function
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mohamed Abdalla --- College of Science, King Khalid University, Saudi Arabia Hala Abd-Elmageed --- South Valley University, Egypt Mahmoud Abul-Ez --- Sohag University, Egypt Mohra Zayed --- College of Science, King Khalid University, Saudi ArabiaOver the last two decades, special matrix functions have become a major area of study for mathematicians and physicists. The famous four Appell hypergeometric matrix functions have received considerable attention by many authors from different points of view. The present... -
On 0012-avoiding inversion sequences and a conjecture of Lin and Ma
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Shane Chern --- Dalhousie University, CanadaThe study of pattern avoidance in inversion sequences recently attracts extensive research interests. In particular, Zhicong Lin and Jun Ma conjectured a formula that counts the number of inversion sequences avoiding the length-four pattern 0012. Our object of the paper... -
Representing polynomials by degenerate Bernoulli polynomials
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dae San Kim --- Sogang University, Republic of Korea Taekyun Kim --- Kwangwoon University, Republic of KoreaIn this paper, we consider the problem of representing any polynomial in terms of the degenerate Bernoulli polynomials and more generally of the higher-order degenerate Bernoulli polynomials. We derive explicit formulas with the help of umbral calculus and illustrate our... -
On Yang-Baxter groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Ballester-Bolinches --- Guangdong University of Education, People’s Republic of China R. Esteban-Romero --- Universitat de València, Spain P. Jiménez-Seral --- Universidad de Zaragoza, Spain V. Pérez-Calabuig --- Universitat de València, SpainA group is said to be an involutive Yang-Baxter group, or simply an IYB-group, if it is isomorphic to the permutation group of an involutive, non-degenerate set-theoretic solution of the Yang-Baxter equation. In this paper, Yang-Baxter groups (YB-groups for short)... -
The opposite of injectivity by proper classes
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Pınar Aydoğdu --- Hacettepe University, Turkey Yılmaz Durğun --- Çukurova University, TurkeyProper classes (or exact structures) offer rich research topics due to their important role in category theory. Motivated by the studies on opposite of injective modules, we introduce a new approach to opposed to injectivity in terms of injectively generated... -
The existence and uniqueness result of entropy solutions for a p(·)-Laplace operator problem in weighted Sobolev spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jiabin Zuo --- Guangzhou University, China Abdelali Sabri --- Hassan 1er University, MoroccoThe paper is concerned with the existence and uniqueness result of entropy solutions for a degenerate elliptic p(·)-Laplacian problem by using the regularization approach and theory of weighted Sobolev spaces with variable exponents. -
Moving the Margins: Gender Inequality and Homelessness in Amma Darko’s Faceless
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Puleng Segalo --- University of South Africa, South Africa Theresah Patrine Ennin --- University of South Africa, South AfricaMany African women writers have engaged with issues of social justice, development and the need to pay attention to the persistent inequalities that eat away the fabric of many societies. To this day, they continue to be at the coalface... -
The integer sequence transform a → b, where bn is the number of real roots of the polynomial a 0 + a 1 x + a 2 x 2 + · · · + anxn
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: W. Edwin Clark --- University of South Florida, USA Mark Shattuck --- University of Tennessee, USAWe discuss the integer sequence transform a 1→ b, where bn is the number of real roots of the polynomial a 0 + a 1 x + a 2 x 2 + · · · + anxn . It is... -
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. -
Restricted inversion sequences and Schröder paths
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: David Callan --- University of Wisconsin-Madison, USA Toufik Mansour --- University of Haifa, IsraelIn this paper, we find an explicit formula for the number of inversion sequences of length n that avoid each of the pattern sets {021, 010}, {021, 011}, {021, 100, 101}, {021, 000, 101}, and {101, 102, 201}. This is... -
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... -
Epimorphisms and closure operators of categories of semilattices
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: D. Dikranjan --- Università degli Studi di Udine, Italy A. Giordano Bruno --- Università degli Studi di Udine, Italy N. Zava --- Institute of Science and Technology Austria (ISTA),Motivated by a problem posed in [10], we investigate the closure operators of the category SLatt of join semilattices and its subcategory SLatt O of join semilattices with bottom element. In particular, we show that there are only finitely many... -
Regenerative economy: A pathway to a future-ready, sustainable Africa
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Judith L. Walls --- Institute for Economy and the Environment, University of St.Gallen, Switzerland Leo Luca Vogel --- University of St.Gallen, SwitzerlandAfrica is experiencing a period of rapid economic growth, booming population, and migration as biodiversity is deteriorating and the climate is warming. Together, these represent grand societal and environmental challenges. The African Union and the United Nations both promote sustainable... -
Using generalised additive models to visualise the annual cycle of primary feather moult patterns
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Rebecca R Irons --- University of Cape Town, South Africa Alan TK Lee --- University of Cape Town, South Africa Robert L Thomson --- University of Cape Town, South Africa Birgit Erni --- University of Cape Town, South AfricaMoult is a vital but energy-demanding event in a bird's phenological cycle. Primary moult is the shedding of old feathers and the regeneration of new flight feathers to maintain efficient functioning of these critical structures. Life history events, such as... -
Secondary vegetation provides a reservoir of non-timber forest products and agroforestry service options for forestry plantation systems, Maputaland, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: AP Starke --- University of Pretoria, South Africa CJ Geldenhuys --- University of Pretoria, South Africa TG O’Connor --- University of the Witwatersrand, South Africa CS Everson --- University of KwaZulu-Natal, South AfricaTree species providing non-timber forest products (NTFPs) have the potential to enhance the socio-economic value of forestry plantation systems and mitigate biodiversity loss associated with production landscapes in Southern Africa. This can be accomplished by integrating NTFP agroforestry systems with... -
A solution to a nonlinear Fredholm integro-differential equation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Anar T. Assanova --- Institute of Mathematics and Mathematical Modeling MES RK, Kazakhstan Sayakhat G. Karakenova --- Institute of Mathematics and Mathematical Modeling MES RK, Kazakhstan Sandugash T. Mynbayeva --- Institute of Mathematics and Mathematical Modeling MES RK, Kazakhstan Rosa E. Uteshova --- Institute of Mathematics and Mathematical Modeling MES RK, KazakhstanThis paper deals with a Fredholm integro-differential equation with nonlinear integral term. By using the Dzhumabaev parametrization method, we reduce the equation to a special Cauchy problem and establish sufficient conditions for the existence of its unique solution. The solution... -
Existence and regularity results for a degenerate elliptic nonlinear equation on weighted Sobolev spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mohsen Alimohammady --- University of Mazandaran, Iran Carlo Cattani --- University of Tuscia, Italy Morteza Koozehgar Kalleji --- Arak University, IranThis paper deals with the existence of many solutions a degenerate weighted elliptic equation which its the number of solutions depend on degeneracy term a i.e., the number of subdomains of Ω\a −1(0) whose boundary is made by submanifolds with... -
Generalized Jordan derivable mappings on
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Kaijia Luo --- Institute of Mathematics, Hangzhou Dianzi University, China Jiankui Li --- School of Mathematics, East China University of Science and Technology, China Shanshan Su --- School of Mathematics, East China University of Science and Technology, ChinaLet be a Hilbert space over the real or complex field and be the algebra of all bounded linear operators on . For arbitrary fixed points C, D, M in , we investigate the structure of linear mappings δ and... -
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... -
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... -
Estimating the impact of digital technologies on government operations, business operations and general welfare: The case of South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Alex Boakye --- Institute for Social Development, South AfricaThe shift towards digitalization is fundamentally transforming societies and changing lives. Meanwhile, many African countries are lagging behind on the dividends of accelerated digital technologies to address their developmental challenges. This is partly because of the dearth of evidence demonstrating... -
On EP matrices, partial isometry matrices and their numerical range
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gholamreza Aghamollaei --- Shahid Bahonar University of Kerman, Iran Mahdiyeh Mortezaei --- Shahid Bahonar University of Kerman, Iran Mohammad Ali Nourollahi --- , IranIn this paper, some properties of the numerical range of some well-known generalized inverses of matrices, such as Moore-Penrose inverse, Drazin inverse, DMP inverse and CMP inverse, are investigated. In particular, an identification of EP matrices is given via the... -
Double total domination in the generalized lexicographic product of graphs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Abel Cabrera-Martínez --- Universidad de Córdoba, Spain Ismael Ríos Villamar --- Universidad Autónoma de Guerrero, Mexico Juan M. Rueda-Vázquez --- Universidad de Córdoba, Spain José M. Sigarreta Almira --- Universidad Autónoma de Guerrero, MexicoLet G be a graph of minimum degree at least two. A set D ⊆ V(G) is said to be a double total dominating set of G if |N (v) ∩ D| ≥ 2 for every vertex v ∈ V(G)... -
General decay and blow up of solutions for a plate viscoelastic p(x)-Kirchhoff type equation with variable exponent nonlinearities and boundary feedback
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jorge Ferreira --- Federal Fluminense University, Brazil Erhan Pişkin --- Dicle University, Turkey Mohammad Shahrouzi --- Jahrom University, IranIn this paper, we consider a plate viscoelastic p(x)–Kirchhoff type equation with variable-exponent nonlinearities of the form -
Generating functions of multiple t-star values
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Zhonghua Li --- Tongji University, China Lu Yan --- Tongji University, ChinaIn this paper, we study the generating functions of multiple t-star values with an arbitrary number of blocks of twos, which are based on the results of the corresponding generating functions of multiple t-harmonic star sums. These generating functions can... -
Generalized derivations with nilpotent values in semiprime rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Cheng-Kai Liu --- National Changhua University of Education, TaiwanLet R be a (semi-) prime ring with extended centroid C, let f(X 1, … , Xk ) be a multilinear polynomial over C in k noncommutative indeterminates which is not central-valued on R and let g be a generalized derivation of... -
Cape genet Genetta tigrina diet in the Albany Thicket Biome, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Axola Plaatjie --- University of Fort Hare, South Africa Filipe Carvalho --- University of Fort Hare, South Africa Rabelani Marikhele --- University of the Witwatersrand, South Africa Zimkitha JK Madikiza --- University of the Witwatersrand, South Africa Emmanuel Do Linh San --- University of Fort Hare, South AfricaThe diet of the Cape genet Genetta tigrina is only well known in the coastal forests of South Africa, where either arthropods or small mammals are their dominant prey. Here, we aimed to demonstrate this species’ opportunistic behaviour by investigating... -
A lemma on C 0-semigroups on time scales and approximate controllability of the heat dynamic equation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Martin Bohner --- Missouri University of Science and Technology, USA Cosme Duque --- Universidad de Los Andes, Hugo Leiva --- University YachayTech, School of Mathematical and Computational Sciences, Ecuador Zoraida Sivoli --- Universidad Siglo 21,In this paper, we present a lemma that allows us to characterize a broad class of C 0-semigroups on time scales, which can be applied to prove existence and uniqueness of solutions of systems of partial differential equations where the... -
Cayley regression problem of some groups
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Q. Liao --- Guangdong University of Education, P.R. China W. Liu --- Central South University, P.R. China J. Tang --- Hunan First Normal University, P.R. ChinaIn this paper, we consider the Cayley regression problem of the cyclic groups and the dihedral groups. We give the sufficient and necessary conditions for the cyclic group ℤ n to be a Cayley regression. Moreover, the dihedral group D... -
Phylogeographic structuring in a widespread southern African grass snake (Psammophiinae: Psammophylax rhombeatus)
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: C. Keates --- Rhodes University, South Africa W. Conradie --- Port Elizabeth Museum (Bayworld), South Africa S. Edwards --- Rhodes University, South AfricaThe structural and environmental heterogeneity within southern Africa has given rise to many morphological forms of Psammophylax rhombeatus distributed throughout the country, with previous studies neglecting the associated molecular significance of these forms. The species’ widespread, generalist ecology coupled with... -
The future of AI: hospitality and tourism perspectives
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Georges El Hajal --- NHL Stenden University of Applied Sciences, The NetherlandsThe Hotel Management School Leeuwarden and the European Tourism Futures Institute organised a webinar to discuss and explore how artificial intelligence (AI) will impact the hospitality and tourism industry in the future. The webinar brought together a panel of academics,... -
Quantitative genetics and breeding strategies in hybrid populations of Pinus patula × Pinus tecunumanii
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Luis Ibarra --- North Carolina State University, USA Gary Hodge --- North Carolina State University, USA Juan José Acosta --- North Carolina State University, USAForestry companies SAFCOL and Sappi conducted a study in South Africa to examine genetic variation and select improved material in full-sib hybrid families of Pinus patula × Pinus tecunumanii. The results from the study on clonal and seedling hybrid populations... -
On the general position number of the k-th power graphs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jing Tian --- Zhejiang University of Science and Technology, China Kexiang Xu --- Nanjing University of Aeronautics & Astronautics, ChinaA set is called a general position set of a graph G if any triple set V 0 of R is non-geodesic, that is, three elements of V 0 cannot lie on the same geodesic of G. The general position... -
Perceived social support and sense of belonging: The mediating role of academic anxiety among first-generation students at a South African university
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Bongani V. Mtshweni --- University of South Africa, South AfricaThis study investigated the role of academic anxiety in the relationship between perceived social support and a sense of belonging of first-generation university students. The sample consisted of 240 undergraduate first-generation students (FGS) at a South African university (female =... -
Adoption and intensity of pearl millet technology packages in drought-prone areas of the Waghimra Zone, Ethiopia: A transition pathway for assuring food security
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Asmiro Abeje Fikadu --- Debre Tabor University, Ethiopia Girma Gezimu Gebre --- Alexander von Humboldt Research Fellow at Leibniz-Centre for Agricultural Landscape Research (ZALF), Germany Hisako Nomura --- , Japan Bishaw Adamtie Takele --- Debre Tabor University, Ethiopia Gedefaw Kindu Wubet --- Debre Tabor University, EthiopiaPearl millet, a climate-resilient crop, is advocated for combating food insecurity in drought-prone areas. To that end, the Ethiopian Agricultural Research Institute and agricultural extensions have been instrumental in promoting pearl millet technology packages. However, a more detailed understanding of... -
On graded-nonnil-Noetherian commutative rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Anass Assarrar --- University S.M. Ben Abdellah Fez, Morocco Najib Mahdou --- University S.M. Ben Abdellah Fez, MoroccoOur present work is motivated by several papers which have introduced and studied the notion of nonnil-Noetherian rings. Let A = ⊕ α ∈G A α be a commutative ring with unity graded by an arbitrary commutative monoid G... -
African Journal of Range and Forage Science: paving the way to restoration in African rangelands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Suzanne J Milton --- Wolwekraal Conservation and Research Organisation, South AfricaFor six decades the African Journal of Range & Forage Science and its precursors have contributed to understanding drivers of rangeland degradation and development of approaches for restoration of damage by grazing, mining and other forms of land use. Of... -
Integration of livestock into conservation agriculture systems in the Mediterranean climate region of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Pieter A Swanepoel --- Stellenbosch University, South Africa Hendrik PJ Smit --- Stellenbosch University, South AfricaWithin the Mediterranean climate region of South Africa, the livestock sector constitutes a substantial contributor to the regional economy. Livestock integration is prevalent in conservation agriculture systems in this region. Crop rotation involving small grains and canola is combined with... -
Taylor theory in quantum calculus: a general approach
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Enas M. Shehata --- Menoufia University, Egypt Rasha M. El Zafarani --- Ain Shams University, EgyptLet the function β be strictly increasing and continuous on an interval I ⊂ ℝ. The β-difference operator is defined by Dβ f (t) = (f(β(t)) − f(t)/(β(t) – t), where t ≠ β(t), and Dβ f (t) = f′... -
Lattice points on polyominoes of inversion sequences
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: José L. Herrera --- Universidad del Cauca, Colombia Toufik Mansour --- University of Haifa, Israel J.L. Ramírez --- Universidad Nacional de Colombia, ColombiaInversion sequences of length n are positive integer sequences e 1 e 2 …e n such that 1 ≤ ei ≤ i for all 1 ≤ i ≤ n. These sequences are in bijection with the permutations of [n]... -
Genome-wide genetic-marker variation uncovers potential stock structuring of oceanic tuna (skipjack) and coastal tuna (kawakawa) within the western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FA Mzingirwa --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya NJ McKeown --- Aberystwyth University, United Kingdom GM Okemwa --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya WHH Sauer --- Rhodes University, South Africa JS Halafo --- Instituto Oceanográfico de Moçambique (InOM), Mozambique JG Mshana --- Sokoine University of Agriculture, Tanzania JN Kamau --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya PW Shaw --- Rhodes University, South AfricaTuna and tuna-like species are highly mobile and migratory, and therefore assumed to have single highly connected populations over large ocean regions. However, empirical data on the genetic population structure of such species in the western Indian Ocean (WIO) remain... -
Interior vertices and edges in integer partitions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Aubrey Blecher --- University of the Witwatersrand, South Africa Charlotte Brennan --- University of the Witwatersrand, South Africa Arnold Knopfmacher --- University of the Witwatersrand, South Africa Toufik Mansour --- University of Haifa, IsraelThis paper characterises the shape of the Young diagram associated with integer partitions in terms of two newly invented statistics which are defined in the text: namely interior vertices and horizontal edges. Generating functions and associated asymptotic results are developed... -
On elliptic curves assigned to a pair of right triangles with an equal hypotenuse
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Arman Shamsi Zargar --- University of Mohaghegh Ardabili, Iran Seiji Tomita --- Tokyo Software Company (Inc.), JapanConsider a pair of right triangles with an equal hypotenuse. This turns out to solve the diophantine system of equations a 2 + b 2 = c 2 + d 2 = e 2 in integers. To this system we... -
Fractional integral inequalities for s-convex functions in the first sense
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gültekin Tınaztepe --- Akdeniz University, Turkey Ilknur Yesilce Isik --- Aksaray University, TurkeyCertain fractional integral inequalities via general fractional integral operator are presented for s-convex functions in the first sense. Also, they are restated in terms of the Riemann-Liouville and Hadamard fractional integrals and illustrated. -
Phases of STI cycle: Countries comparative analysis
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Eugeny Balatsky --- Financial University under the Government of the Russian Federation, Russian Federation Svetlana Ushakova --- Politics and Law in Science and Technology, Russian Federation Vadim Malahov [cor1] Maxim Yurevich --- Financial University under the Government of the Russian Federation, Russian FederationThis article focuses on a comparative analysis of the main technological development stages of a country. For the purpose of assessing the S&T potential of countries, a method of creating a scientific and technological balance is proposed. This approach unites... -
The Common Hermitian Solutions of the matrix equations
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On the preservers of some subsets of the approximate point spectrum
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: H. Benbouziane --- Faculty of Sciences DharMahraz Fes, University Sidi Mohammed Ben Abdellah, Morocco M. Ech-Chérif El Kettani --- Faculty of Sciences DharMahraz Fes, University Sidi Mohammed Ben Abdellah, Morocco I. El Khchin --- Faculty of Sciences DharMahraz Fes, University Sidi Mohammed Ben Abdellah, MoroccoLet be an infinite-dimensional complex Banach space and be the algebra of all bounded linear operators on . For , we consider the following spectral sets in approximate point-spectrum, defined by -
Trauma and the Migrant Archive: Reading The Last Gift Through Second-Generation Memory
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Jacinta Matheka --- Makerere University, UgandaThis paper reads Abdulrazak Gurnah's The Last Gift to unearth the intersection of migrants’ trauma, memory and identity. I explore migrants’ trauma in reconciling silenced histories with their present states in the quest for an identity. Abdulrazak Gurnah's migrant-centred narratives... -
The general position number under vertex and edge removal
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Pakanun Dokyeesun --- Institute of Mathematics, Physics and Mechanics, Slovenia Sandi Klavžar --- University of Ljubljana, Slovenia Jing Tian --- School of Science, Zhejiang University of Science and Technology, P.R. ChinaLet gp(G) be the general position number of a graph G. It is proved that gp(G − x) ≤ 2gp(G) holds for any vertex x of a connected graph G and that if x lies in some gp-set of G,... -
Congruences modulo powers of 5 for partitions into odd and distinct parts
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dazhao Tang --- Chongqing Normal University, P.R. ChinaLet Q 0(n) denote the number of partitions of n into odd and distinct parts. In 1969, Rødseth proved an infinite family of congruences modulo high powers of 5 for Q 0(n) by employing the theory of modular forms. In... -
Abstract degenerate difference equations
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Marko Kostić --- University of Novi Sad, SerbiaIn this paper, we consider some classes of the abstract degenerate difference equations with integer-order derivatives. We also investigate the existence and uniqueness of almost periodic type solutions to the abstract degenerate difference equations. -
Approximate controllability of a parabolic dynamic equation on homogeneous time scales
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Martin Bohner --- Missouri University of Science and Technology, USA Cosme Duque --- Universidad de Los Andes, Hugo Leiva --- University YachayTech, School of Mathematical and Computational Siences, San Miguel de Urcuqui, EcuadorThis paper aims to explore the approximate controllability of a semilinear system of parabolic dynamic equations on homogeneous time scales. Building on the innovative semigroup theory for time scales introduced in [13], we leverage a pivotal lemma from [5] that... -
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... -
Geometric characterizations of some analytic functions related to the generalized Marcum Q-function
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Abdulaziz Alenazi --- College of Science, Northern Border University, Saudi Arabia Khaled Mehrez --- Kairouan Preparatory Institute for Engineering Studies, University of Kairouan, TunisiaThe aim of this paper is to study certain geometric properties, such as convexity of order α (0 ≤ α < 1) and uniform convexity inside the unit disk, for a class of analytic functions related to the generalized Marcum... -
Changing midlife tropes: A transcendence into epiphany
Item type: Journal Article • Journal: Indo-Pacific Journal of Phenomenology • Authors: Louisa Niehaus --- University of South Africa, South Africa Maria Papaikonomou --- University of South Africa, South AfricaMidlife is often stereotyped as a time of turbulence, angst and chaos, marked by inappropriate behaviours, broken marriages, infidelity and destructive changes. However, this article aims to challenge these stereotypes and present a different perspective. It argues that midlife is... -
Exploring auditing experts’ reactions to expanded public sector auditors’ powers in South Africa
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Lindani Myeza --- University of the Witwatersrand, South Africa Naledi Nkhi --- University of the Witwatersrand, South Africa -
General decay results for a nonlinear Viscoelastic Timoshenko system
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ibtissam Fekrache --- Higher Normal School of Technological Education (ENSET), Algeria Djalal Boucenna --- Higher Normal School of Technological Education (ENSET), Algeria Amar Chidouh --- Chadli Bendjedid University, Algeria Djamel Ouchenane --- Amar teledji University Laghouat, Algeria Salah Boulaaras --- College of Sciences, Qassim University, Saudi Arabia Rashid Jan --- College of Sciences, Qassim University, Saudi ArabiaIn this paper, we focus on the Timoshenko viscoelastic system associated with a nonlinear term. The general stability is established by means of the energy method under the assumption of equal speeds, leading to an energy decay rate that includes... -
Estimates for the Pre-Schwarzian norm for certain subclasses of analytic functions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Rashid Ali --- Government College University Faisalabad, Pakistan Mohsan Raza --- Government College University Faisalabad, PakistanFor λ ≥ 1, let be the class of analytic functions f in the open unit disc defined by . Similarly, for the class is defined by . In this article, we present estimates for the pre-Schwarzian norm of functions... -
Congruences modulo powers of 5 for 5 k -regular bipartitions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Zhuohang Chen --- Chongqing Normal University, P.R. China Dazhao Tang --- Chongqing Normal University, P.R. ChinaLet B ℓ(n) denote the number of ℓ-regular bipartitions of n. In this paper, we investigate congruence properties of B 5k (n) modulo high powers of 5. By deriving the exact generating functions of specific arithmetic progressions in B 5k... -
Model and measure: comparing soil organic carbon stocks quantification approaches at field scale in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Willie Herman Cloete --- North-West University, South Africa Gerhard du Preez --- North-West University, South Africa George Munnik van Zijl --- North-West University, South AfricaThere is an ongoing debate about the most appropriate approach for quantifying changes in soil organic carbon stocks (SOCS). The aim of the study was to evaluate the performance of the Rothamsted carbon (RothC) modelling approach against the re-measured SOCS... -
One-sided Drazin invertibility in Banach algebras and perturbations of B-Fredholm spectra
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Kai Yan --- Fuzhou University, P.R. ChinaThe famous Drazin inverse and generalized Drazin inverse were originally introduced by Drazin in 1958 and Koliha in 1996, respectively. In this paper, the author presents simplified notions of left and right (generalized) Drazin inverses, which are the one-sided versions... -
Delta-shocks and vacuums as flux-approximation limit of solutions to the Aw-Rascle model with time-dependent source
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mengqi Cui --- Department of Mathematics, Yunnan Normal University, P.R. China Shuai Fan --- Department of Mathematics, Yunnan Normal University, P.R. China Yu Zhang --- Department of Mathematics, Yunnan Normal University, P.R. ChinaThe flux-approximation limit of solutions to the Aw-Rascle (AR) traffic flow model with time-dependent source is considered. First, the Riemann problem containing flux perturbation and generalized Chaplygin gas (GCG) pressure is solved. Then, it is proved that, as the flux...
