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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...

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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 Africa

A 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...

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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 Africa

Twenty-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...

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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. Booth

Abundance 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...

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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. Butterworth

Catch 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...

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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 Africa

This 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...

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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 Africa

This 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...

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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 Naranjo

We 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.

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Generalized Derivations of Associative Algebras

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Hiroaki Komatsu Atsushi Nakajima

In 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...

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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 Alten

We 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.

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Permutation actions of the symmetric group S_n on the Groups Zⁿ _m and Zⁿ _m

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jamshid Moori Kenneth Zimba

Let 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...

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FISCHER-CLIFFORD MATRICES OF B (2, n)

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jamshid Moori Kenneth Zimba

In [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...

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(Φ, M)–extensions of near-rings

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Mark Farag

In 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.

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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. Urbina

In 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...

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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, India

The 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.

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On Prime and Semiprime Near-Rings with Generalized Derivation

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Öznur Gölbaşi --- Department of Mathematics, Turkey

Let 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...

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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-Egypt

Two 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...

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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, Pakistan

A 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...

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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, Norway

Psychosocial 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...

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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 Africa

Variable 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...

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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 Africa

The 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...

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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 --- , UK

Seasonal 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...

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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), Spain

The 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...

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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 Africa

The 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...

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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, Germany

Data 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...

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The Uniform Order Convergence Structure on ML (X)

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: vanJ.H. der Walt

The 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...

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Frame valued stratified generalized convergence groups

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: T.M.G. Ahsanullah Jawaher Al-Mufarrij

Following 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...

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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, Iran

For 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]...

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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 Stanger

In 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...

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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)...

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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,

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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, Japan

We 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.

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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, Japan

We 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...

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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, India

Background: 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.

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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, Nigeria

Background: 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...

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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, USA

The 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...

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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, Egypt

Objective: 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.

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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.

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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...

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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,

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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.

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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

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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...

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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...

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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 Africa

Aim: 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...

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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, Nigeria

Background: 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...

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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 Schronen

Attention-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...

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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...

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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...

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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...

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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, Nigeria

Background: 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...

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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...

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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...

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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...

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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...

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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,

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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...

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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...

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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...

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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...

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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...

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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...

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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.

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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...

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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...

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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), France

This 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...

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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 Africa

This 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...

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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 Africa

Although 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...

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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...

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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,...

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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...

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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...

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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 Africa

Background: 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...

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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, Namibia

The 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...

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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, Spain

A 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...

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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 Africa

Phytoplankton 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...

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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 Africa

During 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...

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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 Africa

The 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...

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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, Norway

The 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...

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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 Africa

Strengthening 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...

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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 Africa

Background: 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...

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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 Africa

Sorghum 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...

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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 Africa

The 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...

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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...

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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 --- , , Algeria

Pleurodeles 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...

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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 Korea

The 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...

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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, France

The 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...

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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 Africa

In 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...

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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 Africa

Simultaneous 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...

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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 Africa

The 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...

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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 Africa

In 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...

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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 Kingdom

This 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...

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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 Africa

The 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...

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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 Africa

Spatial 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...

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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 Africa

Background: 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...

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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 Africa

Generalised 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...

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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 Africa

The 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...

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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 --- , Azerbaijan

In 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...

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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 --- , Greece

Volume 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...

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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 Africa

This 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,...

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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 --- , Ghana

The 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...

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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 Africa

Drought 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...

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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 --- , Austria

This 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...

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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 --- , Zimbabwe

Studies 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...

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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 --- , France

Body 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...

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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 Africa

Anthropogenic 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...

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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 --- , Portugal

Reintroduction 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,...

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Curvature properties of metric and semi-symmetric linear connections

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Milo&scaron; Z. Petrović --- , Serbia Nenad O. Vesić --- , Serbia Milan Lj. Zlatanović --- , Serbia

Considering 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.

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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, Russia

In 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...

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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...

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$An investigation into the normal tax implications of fractional share rights in South Africa$

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 Africa

A 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...

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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, USA

In 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...

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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, Argentina

In 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...

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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...

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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 Africa

Moult 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...

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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, Kazakhstan

This 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...

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Generalized Jordan derivable mappings on B ( H )

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, China

Let 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...

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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 Africa

We 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...

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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 Africa

The 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...

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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 --- , Iran

In 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...

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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, Mexico

Let 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)...

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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, Iran

In this paper, we consider a plate viscoelastic p(x)–Kirchhoff type equation with variable-exponent nonlinearities of the form

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Generalized derivations with nilpotent values in semiprime rings

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Cheng-Kai Liu --- National Changhua University of Education, Taiwan

Let 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...

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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 Africa

The 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...

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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. China

In 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...

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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 Africa

The 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...

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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, USA

Forestry 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...

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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, China

A 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...

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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, Ethiopia

Pearl 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...

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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, Morocco

Our 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...

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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, Egypt

Let 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′...

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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, Turkey

Certain 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.

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The Common Hermitian Solutions of the matrix equations B 2 X B 2 * = A 2 and B 3 X B 3 * = A 3 subject to inequality restrictions

Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Zhanshan Wang --- Northeastern University, P.R. China Huiting Zhang --- Northeastern University, P.R. China Honglin Zou --- Zhejiang Shuren University, P.R. China

Problem CHS: Given , find such that X ≥ 0 (> 0), where is given by

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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, Morocco

Let 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

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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. China

Let 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,...

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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, Iran

This 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...

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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, Tunisia

The 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...

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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

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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 Arabia

In 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...

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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, Pakistan

For 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...

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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. China

The 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...

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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. China

The 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...

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