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The influence of various types and frequencies of rest on the production and condition of sourveld grazed by sheep or cattle. 2. Vigour
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KP KirkmanTreatments involving a full growing season rest in alternate years, half a growing season rest (late season) in alternate years and no rest were applied to veld grazed by sheep or cattle at similar stocking rates. Residual effects of the... -
A Case of Tragic Optimism: Volunteer Counsellors' Experience of Meaning
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Henry D. Mason --- Tshwane University of Technology, Juan A. Nel --- University of South Africa,This study applied concepts from logotherapy to construct the meaning that volunteer crisis counsellors experienced by working with victims of crime. Data were collected from seven participants who delivered services at community-driven crisis centre using a qualitative approach. The data... -
Semigroups of transformations with fixed sets
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Preeyanuch Honyam --- Department of Mathematics, Faculty of Science, Thailand Jintana Sanwong --- Department of Mathematics, Faculty of Science, ThailandLet T (X) denote the semigroup (under composition) of transformations from X into itself. For a fixed subset Y of X, let Fix(X, Y) be the set of all self-maps on X which fix all elements in Y. Then Fix(X,... -
Final results from a trial to test the effect of plot size on Eucalyptus hybrid clonal ranking in coastal Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: TK Stanger --- , South Africa GM Galloway --- Shaw Research Centre, South Africa ECL Retief --- Shaw Research Centre, South AfricaHybrid clones with Eucalyptus grandis as one parent and, generally, E. urophylla as the other parent, are deployed commercially as monoclonal blocks by Sappi in the subtropical region of coastal Zululand, South Africa. In monoclonal blocks genotypes are grown in... -
On the Ranks of Janko Groups J 1, J 2, J 3 and J 4
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Faryad Ali Jamshid MooriIf 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. In the present paper we study the rank(Ji... -
Survival, growth, wood basic density and wood biomass of seven-year-old Casuarina species/provenances grown at Kongowe, Kibaha, Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Abeid I Kindo --- Tanzania Forest Services, Tanzania Ezekiel Edward --- Department of Forest Biology, Tanzania Mathew A Mndolwa --- Tanzania Forestry Research Institute, Tanzania Shabani AO Chamshama --- Department of Forest Biology, TanzaniaA performance comparison of seven-year-old individuals of 13 Casuarina species/provenances in terms of survival, growth (diameter, height and volume), wood basic density and wood biomass was undertaken at Kongowe, Kibaha, Tanzania. The trial was laid out using a randomised complete... -
Relevance of Schneider's first-rank symptoms in Zulu patients with paranoid schizophrenia
Item type: Journal Article • Journal: South African Family Practice • Authors: B Schiopu --- Department of Family Medicine, Faculty of Health Sciences, M Nel --- Department of Biostatistics, Faculty of Health Sciences, LA Hiemstra --- Department of Family Medicine, Faculty of Health Sciences, B Latecki --- ,Background: The aim of this study was to examine the prevalence of Schneider's first-rank symptoms (FRS) in Zulu patients diagnosed with paranoid schizophrenia and to ascertain the diagnostic and prognostic significance of Schneider's FRS in this group. -
Prioritising species for research, conservation and management: a case study of exploited fish species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SJ Lamberth --- Branch: Fisheries Management, Department of Agriculture, South Africa AR Joubert --- Southern Waters Ecological Research and Consulting, South AfricaStudies that categorise species according to their conservation status often fall short in their implementation by not having taken into account the impacts on, or the response from, those that either benefit from, or exploit, the resource under consideration. This... -
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... -
Dominance rank and self-scratching among wild female Barbary macaques (Macaca sylvanus)
Item type: Journal Article • Journal: African Zoology • Authors: Stefano S.K. Kaburu --- Centre for Research in Evolutionary and Environmental Anthropology, University of Roehampton, U.K. Ann MacLarnon --- Centre for Research in Evolutionary and Environmental Anthropology, University of Roehampton, U.K. Bonaventura Majolo --- School of Psychology, University of Lincoln, Brayford Pool, U.K. Mohamed Qarro --- École Nationale Forestiére d’Ingénieurs, Avenue Moulay Yousseff, BP 511, Morocco Stuart Semple --- Centre for Research in Evolutionary and Environmental Anthropology, University of Roehampton, U.K.Measuring rates of self-scratching provides a powerful index of anxiety in non-human primates, and investigating the relationship between self-scratching and dominance rank can shed light on the ‘emotional costs’ of holding different positions in the hierarchy. Here we explored the... -
Recent evidence on the persistence of fund performance – A note
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: D Bradfield --- Department of Statistical Sciences, J Swartz --- University of Cape Town,This note highlights recent evidence on the persistence of fund performance in South Africa, throwing new light on the 1985–1995 study conducted by Meyer (1997). Our analysis on the persistence of South African fund performance is based on the General... -
Recent evidence on the persistence of fund performance—A note
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: D Bradfield --- Quantitative Research, Cadiz Holdings, J Swartz --- University of Cape Town,This note highlights recent evidence on the persistence of fund performance in South Africa, throwing new light on the 1985–1995 study conducted by Meyer (1997). Our analysis on the persistence of South African fund performance is based on the General... -
Design of a hand water pump using a quick-return crank mechanism
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: C. A. Okoronkwo --- Department of Mechanical Engineering, Nigeria B. O. Ezurike --- Department of Mechanical Engineering, Nigeria R. Uche --- Department of Mechanical Engineering, Nigeria J. O. Igbokwe --- Department of Mechanical Engineering, Nigeria O. N. Oguoma --- Department of Mechanical Engineering, NigeriaThe detailed design procedure for a quick-return mechanism hand water pump is presented. The system designed is basically a modification to reciprocating lift pumps also known as India mark III. The modified pump is operated by the up and down... -
Dominance hierarchies within different size groupings of Nile tilapia (Oreochromis niloticus) and effects on growth and physiological responses
Item type: Journal Article • Journal: African Zoology • Authors: Kwasi Adu Obirikorang --- , Ghana Anthea Georgina Ama Ofori --- , Ghana Benjamin Apraku Gyampoh --- , GhanaHierarchies are prevalent in social animals and display of aggression by dominant individuals often results in appetite and growth suppressions in lower-ranked fish. This study investigated the effects of dominance hierarchies on growth and some physiological responses in Nile tilapia... -
Does the choice of fund performance measure matter?
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Christopher Adcock --- School of Finance and Management, UK Nelson Areal --- NIPE Research Centre, School of Economics and Management, Portugal Maria Céu Cortez --- NIPE Research Centre, School of Economics and Management, Portugal Benilde Oliveira --- School of Economics and Management, Portugal Florinda Silva --- NIPE Research Centre, School of Economics and Management, PortugalThis paper investigates whether investment strategies using rankings based on different portfolio performance measures lead to different future abnormal returns. A set of 13 commonly used risk-adjusted performance measures is applied to a dataset of US equity mutual funds over... -
Diversity pattern of bats (Mammalia: Chiroptera) in a modified tropical environment in the western region of Cameroon
Item type: Journal Article • Journal: African Zoology • Authors: Manfothang Dongmo Ervis --- , Cameroon Bakwo Fils Eric-Moise --- , Cameroon Mongombe Manga Aaron --- , Cameroon Atagana Patrick Jules --- , Cameroon Tchuenguem Fohouo Fernand-Nestor --- , CameroonThe western region of Cameroon is one of the leading agricultural production areas in sub-Saharan Africa, and this ongoing anthropogenic perturbation has led to the replacement of natural forests with agroecosystems. Such anthropogenic landscape transformations may have affected bat species... -
Revisiting ‘A monograph on the Polychaeta of southern Africa’: establishing taxonomic research priorities in southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Simon --- , South Africa J Kara --- , South Africa DT Clarke --- , South Africa S Sedick --- , South AfricaOriginally published in 1967, John H Day’s work ‘A monograph on the Polychaeta of southern Africa’ is still used widely to identify polychaetes. However, ongoing taxonomic revisions have revealed that several putative cosmopolitan or locally widespread taxa contained in the... -
A note on a conjecture concerning rank one perturbations of singular M-matrices
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: B. Anehila --- ROC Mondriaan, The Netherlands A.C.M. Ran --- VU Amsterdam, The NetherlandsA conjecture from [3] concerning the location of eigenvalues of rank one perturbations of singular M-matrices is shown to be false in dimension four and higher, but true for dimension two, as well as for dimension three with an additional... -
More on cardinality bounds involving the weak Lindelöf degree
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Bella --- University of Catania, Italy N. Carlson --- California Lutheran University, USA I. Gotchev --- Central Connecticut State University, USAWe give several new bounds for the cardinality of a Hausdorff topological space X involving the weak Lindelöf degree ωL(X). In particular, we show that if X is extremally disconnected, then |X| ≤ 2 ωL (X)πχ(X)ψ(X), and if X... -
A family of congruent number elliptic curves of rank three
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Lorenz Halbeisen --- , Switzerland Norbert Hungerbühler --- , Switzerland Arman Shamsi Zargar --- University of Mohaghegh Ardabili, IranRecent progress in the theory of Heron triangles and their elliptic curves led to new families of congruent number elliptic curves with rank at least two. Based on these results, we derive a parametric family of congruent number elliptic curves... -
Examining swap butterfly risk premia in South Africa
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Sanveer Hariparsad --- University of Pretoria, South Africa Eben Maré --- University of Pretoria, South AfricaThis paper studies a long butterfly strategy (which is immune to parallel curve shifts but exposed to non-parallel curve shifts) on the South African interest rate swap curve. Ten swap butterfly risk factors are identified using monthly South African swap... -
Congruences modulo powers of 5 for the crank parity function
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dazhao Tang --- Chongqing Normal University, P.R. ChinaIn 1988, Andrews and Garvan introduced the partition statistic “crank” in order to give combinatorial interpretation for Ramanujan’s celebrated partition congruence modulo 11. In 2009, Choi, Kang and Lovejoy established congruences modulo powers of 5 for the crank parity function... -
On partial endomorphisms of a star graph
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ilinka Dimitrova --- South-West University “Neofit Rilski”, Bulgaria Vítor H. Fernandes --- Universidade Nova de Lisboa, Portugal Jörg Koppitz --- Institute of Mathematics and Informatics, BulgariaIn this paper we consider the monoids of all partial endomorphisms, of all partial weak endomorphisms, of all injective partial endomorphisms, of all partial strong endomorphisms and of all partial strong weak endomorphisms of a star graph with a finite... -
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... -
Women, gender fluidity and Shona kinship structure in Zimbabwe
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Rose Jaji --- German Institute of Development and Sustainability, GermanyThis article discusses the complexities of Shona kinship structure and how it positions women through relationships that are based on consanguinity and affinity. The article, which is an auto-ethnographic discussion emanating from my insider status as a participant observer in... -
Multiplicatively maximal numerical range-preserving maps
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Abdellatif Bourhim --- Syracuse University, USA Mohamed Mabrouk --- Umm Al-Qura University, Saudi ArabiaLet be the algebra of all bounded linear operators on a complex Hilbert space . For any operator , let W 0(T) be the maximal numerical range of T. We show that two maps φ 1 and φ 2 from... -
Rings whose indecomposable modules are pure-projective or pure-injective
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: François Couchot --- Normandie Univ, FranceLet be the class of rings for which every indecomposable right module is pure-projective or pure-injective. When R is a Noetherian local commutative ring of maximal ideal P, it is proven that R ∈ if and only if R is... -
An efficient hybrid transform algorithm for image compression using a matrix rank-based optimization approach
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: D. Linett Sophia --- Erode Sengunthar Engineering College, India S. Kavitha --- Nandha Engineering College, IndiaThe digital images play a major part in variety of fields such medical, satellite, remote sensing, etc. Advancements in information technology have resulted in a huge number of digital images to be stored and transmitted. Since the demand for storage... -
The Frank graph
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Efruz Özlem Mersin --- Aksaray University, Turkey Ayşe Dilek Maden --- Selcuk University, Turkey Mustafa Bahşi --- Aksaray University, TurkeyThis paper introduces the Frank graph, a special weighted digraph with self-loops whose adjacency matrix corresponds to the Frank matrix, a special Max matrix. We derive bounds for the spectral radius and energy of the graph and illustrate these results...