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Climatic and edaphic conditions at eragrostis lehmanniana nees sites in Arizona, USA and the cape province, RSA and potential seeding sites in Southern Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: JerryR. Cox --- U.S. Department of Agriculture, USA J.L. Stroehlein --- Soil and Water Department, USA J.H. Fourie --- , Republic of South AfricaClimatic and edaphic conditions at Eragrostis lehmanniana Nees sites in southeastern Arizona, USA were compared with those in the Cape Province, RSA to determine a range of conditions under which the species might be expected to establish and persist in... -
Evaluation of three techniques for measuring grass leaf area1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.W. Daphne --- Department of Grassland Science, Republic of South Africa P.J.K. Zacharias --- Department of Grassland Science, Republic of South Africa A.C. Hansen --- Department of Agricultural Engineering, Republic of South AfricaThree leaf area measuring techniques were compared. Although statistical considerations received priority, practical issues such as economy of time, labour and finance, were also evaluated. The electronic light interception planimeter and the squared grid method (SGM) are already in common... -
THE ENERGY BASE OF AQUATIC SYSTEMS IN SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. Allanson --- Institute for Freshwater Studies, Department of Zoology, and Entomology, South AfricaThe energy base of reservoirs and lakes is examined. There is considerable variation in specific productivity and photosynthetic capacity depending on trophic condition and whether algae or suspensoids reduced transparency. While limnetic production is important in freshwater, it is not... -
Growth modelling of Pinus roxburghii in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E.R. Falkenhagen --- , South AfricaThe growth in diameter at breast height, height and tree volume and plot density were studied in an unreplicated spacing trial of Pinus roxburghii at Weza, South Africa. -
Dimensions of Social Well-Being in a Motor Manufacturing Organisation in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Melanie de Jager --- University of South Africa, Sanet Coetzee --- University of South Africa, Deléne Visser --- University of South Africa,The study examined the psychometric properties of the 15-item version of the Social Well-being Scale (SWBS-15: Keyes, 1998) for a South African sample with diversity in culture. The SWBS-15 and a biographical questionnaire were administered to employees in a motor... -
Forgivingness: An Angolan-Portuguese Comparison
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Félix Neto --- University of Oporto, Portugal Maria da Conceição Pinto --- University of Oporto, PortugalForgiveness can be considered on multiple levels, from those interpersonal incidents that are contextualized to a dispositional trait form that transcends individual injustices. Three distinct aspects of forgivingness (dispositional forgiveness) have been recently put forward: (a) Lasting resentment; that is,... -
Well-Being in the Batswana Cultural Context: Constructs and Measures
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 AfricaThe study investigated wellbeing in a Setswana-speaking sample. Participants (n=459, males =141 females =318; 22% = aged between 30 and 40 years) completed the General Psychological Well-being Scale (GPWS: Khumalo, Temane & Wissing, 2010) and the Mental Health Continuum Short-Form... -
Comparison of fish-community size spectra based on length frequencies and mean lengths: a note
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Yemane MH Griffiths JG FieldEstimates of fish-community size spectra are promising indicators of the impact of fishing on fish assemblages. Size spectra consist of logarithmic graphs of abundance plotted against fish body size. Size spectra may either be constructed from length frequency data or... -
Growth of market-size abalone (Haliotis midae) fed kelp (Ecklonia maxima) versus a low-protein commercial feed
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TL Francis GW Maneveldt J VenterThe growth of grow-out abalone fed on kelp, with c. 10 % dry weight protein content, was compared with that of those fed on 'Feed A' (a new low-protein commercial feed of c. 26 % protein), in a flow-through system... -
Composition and abundance of the zooplankton community in the Bitter Lakes, Egypt, in relation to environmental factors
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RA El-BassatThe taxonomic composition of the zooplankton community of the Bitter Lakes, Egypt, was examined in 2003–2004 in relation to the spatial and temporal distribution of environmental factors. Copepoda were dominant, forming 49% of the zooplankton, followed by Protista at 37%... -
On a Constant Arising in the Analysis of Bit Comparisons in Quickselect
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: PeterJ. Grabner Helmut ProdingerA (real) constant that appears as the factor of the leading term of the average number of bit comparisons required by quickselect, and was originally given in terms of complex numbers, is expressed using real numbers alone. A further representation... -
Regional vegetation management standards for commercial pine plantations in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: CA Rolando --- , New Zealand KM Little --- , South AfricaDuring the 1990s a number of trials were implemented in the summer rainfall region of South Africa to determine both the short- and long-term impacts of competing vegetation on pine growth. Trial sites were selected across different physiographic regions such... -
Regional vegetation management standards for commercial Eucalyptus plantations in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: KM Little CA RolandoDuring the 1990s a number of trials were implemented in the summer-rainfall region of South Africa to determine both the short- and long-term impacts of competing vegetation on eucalypt growth. Trial sites were selected across different physiographic regions such that... -
Growth rates of alien Oreochromis niloticus and indigenous Oreochromis mortimeri in Lake Kariba, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PC Chifamba --- Department of Biological Sciences, Zimbabwe JJ Videler --- Centre for Ecological and Evolutionary Studies, The NetherlandsGrowth rates of indigenous Oreochromis mortimeri and alien Oreochromis niloticus from Lake Kariba were estimated from samples collected in 1997–2000, 2003–2005 and 2010–2011. Growth zones on scales and otoliths of O. niloticus and on the otoliths and opercula of O... -
A comparison of non-invasive versus invasive methods of haemoglobin estimation in patients undergoing intracranial surgery
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Puneet Khanna --- Department of Anaesthesiology, India Vanitha Rajagopalan --- Department of Anaesthesiology, India Gyaninder Singh --- Department of Neuroanaesthesiology, India Hemanshu Prabhakar --- Department of Neuroanaesthesiology, IndiaBackground: Until recently, invasive monitoring techniques were the only ones available for the estimation of haemoglobin (Hb) in the blood. However, following the introduction of a new non-invasive monitor, Hb concentration could be non-invasively and continuously monitored. It allows immediate... -
Social comparison influences on disciplinary panels: a brief qualitative study in Kenyan secondary schools
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Peter J.O. Aloka --- Department of Psychology & Educational Foundations, Kenya Olaniyi Bojuwoye --- Department of Educational Psychology, South AfricaThis study investigated the influences of social comparisons on group polarization in decision making among members of selected Kenyan secondary school disciplinary panels. Ten participants from 10 selected secondary school disciplinary panels were involved. Semi-structured interviews were used to collect... -
Otoliths versus scales: evaluating the most suitable structure for ageing largemouth bass, Micropterus salmoides, in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: G.C. Taylor --- Department of Ichthyology and Fisheries Science, South Africa O.L.F. Weyl --- Centre for Invasion Biology, South African Institute for Aquatic Biodiversity, South AfricaThe suitability of scales for ageing Micropterus salmoides was determined by comparing the precision of growth zone counts on scales with those obtained from sectioned sagittal otoliths from a sample of 496 fish collected from Wriggleswade and Mankazana Impoundments in... -
Ecosystem modelling in the southern Benguela: comparisons of Atlantis, Ecopath with Ecosim, and OSMOSE under fishing scenarios
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Smith --- Department of Zoology, Australia EA Fulton --- CSIRO [Commonwealth Scientific and Industrial Research Organisation], Australia RW Day --- Department of Zoology, Australia LJ Shannon --- Marine Research Institute and Department of Biological Sciences, South Africa Y-J Shin --- Marine Research Institute and Department of Biological Sciences, South AfricaEcosystem-based management of marine fisheries requires the use of simulation modelling to investigate the system-level impact of candidate fisheries management strategies. However, testing of fundamental assumptions such as system structure or process formulations is rarely done. In this study, we... -
Telling stories and adding scores: Measuring resilience in young children affected by maternal HIV and AIDS
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Liesel Ebersöhn --- Centre for the Study of Resilience and Department of Educational Psychology, South Africa Irma Eloff --- Centre for the Study of Resilience and Department of Educational Psychology, South Africa Michelle Finestone --- Centre for the Study of Resilience and Department of Educational Psychology, South Africa Adri Grobler --- Centre for the Study of Resilience and Department of Educational Psychology, South Africa Melanie Moen --- Centre for the Study of Resilience and Department of Educational Psychology, South Africa“Telling stories and adding scores: Measuring resilience in young children affected by maternal HIV and AIDS”, demonstrates how a concurrent mixed method design assisted cross-cultural comparison and ecological descriptions of resilience in young South African children, as well as validated... -
Multi-criteria performance evaluation of an airline maintenance programme – A case study
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Kazeem A Adebiyi --- Mechanical Engineering Department, Nigeria Olasunkanmi O Akinyemi --- Agricultural and Mechanical Engineering Department, Nigeria Egunleti O Adeleye --- Agricultural and Mechanical Engineering Department, NigeriaIt has always been a concern to most airline operators why their aircraft are on the ground despite all the resources being incurred on maintenance. It is the main goal of this study to evaluate the performance of an airline... -
Calibration and validation of APSIM–Maize, DSSAT CERES–Maize and AquaCrop models for Ethiopian tropical environments
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Hirut Getachew Feleke --- , South Africa MJ Savage --- , South Africa Kindie Tesfaye --- , EthiopiaProcess-based crop models are popular tools to quantify the impact of changes due to climate or crop management. Accurate simulation of crop production for different agro-ecological conditions using an individual crop model remains challenging due to different sources of uncertainty... -
What is luxury hospitality? A need to move towards a scientific understanding
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Andy Heyes --- , The NetherlandsThe world of luxury and that of luxury hospitality has been growing for numerous years. From hotels such as the Burj Al Arab in Dubai, The Torch in Doha and The Savoy in London, luxury hospitality and the variety which... -
Is happiness based on psychological harmony? Exploring the mediating role of psychological harmony in the relationship between personality characteristics and occupational well-being
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Yuzhu Zhang --- , China Leigang Zhang --- , China Yunlong Wu --- , ChinaThis study proposed and tested a theoretical model for specifying the structural relationship between personality characteristics (including core self-evaluation, social comparison, philosophies of human nature, psychological capital), psychological harmony, and occupational well-being in a higher education setting. We analysed data... -
Investigating stimulating factors for customer booking intentions on brand websites
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Marit de Vries --- NHL Stenden University of Applied Sciences, The Netherlands Niels Klein Poelhuis --- NHL Stenden University of Applied Sciences, The NetherlandsCustomers have ample opportunities regarding channels to use to book a hotel room: offline and online. In the online world, the options are using the hotel’s website, referred to as the brand website, or third party internet sites like online... -
Upward social comparisons on social networking sites (SNSs) and subjective well-being: The mediating role of envy
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Yongzhan Li --- Xuchang University, ChinaThis study examined the mediating role of envy in the relationship between upward social comparison on social networking sites (SNSs) and subjective well-being. Participants were 1 078 college students (male = 46.01%, female = 53.99%; freshmen = 27.18%, sophomores =... -
Short-video usage and female college students’ restricted diets: a chain mediation model
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Tingting Fu --- Normal University, China Xiong Li --- Guangzhou Huashang Vocational College, China Xuesong Wei --- Guangxi Technology and Business Vocational College, China Jun Qin --- Normal University, ChinaWith the popularity of short-video platforms, people’s self-concept and body views are everyday concerns, including their dieting. How short-video platforms impact people’s dieting especially for female college students, remain unclear. This study examines the mediating paths between short-video usage and... -
A shelf-scale assessment of GLORYS and BRAN ocean reanalysis model outputs for the southern Benguela Upwelling System
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AM Kupczyk --- Fisheries and the Environment (DFFE), South Africa T Lamont --- Fisheries and the Environment (DFFE), South Africa I Halo --- Fisheries and the Environment (DFFE), South Africa CS Russo --- Fisheries and the Environment (DFFE), South Africa T Rixen --- Institute for Geology, Universität Hamburg, Germany N Lahajnar --- Institute for Geology, Universität Hamburg, GermanyThe Benguela Upwelling System, with its high variability and productivity, is challenging to monitor owing to limited in situ ocean observations. Researchers therefore often use ocean reanalysis products to simulate oceanographic conditions. We evaluated the performance of the GLORYS and... -
HIV incidence and prevalence projections for Zimbabwe: Findings from five mathematical models
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Isaac Taramusi --- UNAIDS UCO Zimbabwe, Zimbabwe John Stover --- , United States of America Robert Glaubius --- , United States of America Tsitsi Apollo --- Ministry of Health and Child Care, Zimbabwe Getrude Ncube --- Ministry of Health and Child Care, Zimbabwe Owen Mugurungi --- Ministry of Health and Child Care, Zimbabwe Ngwarai Sithole --- Ministry of Health and Child Care, Zimbabwe Loveleen Bansi-Matharu --- Institute for Global Health, University College London, United Kingdom Jenny Smith --- Institute for Global Health, University College London, United Kingdom Andrew Phillips --- Institute for Global Health, University College London, United Kingdom Valentina Cambiano --- Institute for Global Health, University College London, United Kingdom Daniel T Citron --- New York University Grossman School of Medicine, United States of America Anna Bershteyn --- New York University Grossman School of Medicine, United States of America Debra ten Brink --- Burnet Institute, Australia Rowan Martin-Hughes --- Burnet Institute, Australia Michael Pickles --- Medical Research Council Centre for Global Infectious Disease Analysis, Imperial College London, United Kingdom Paul Revill --- University of York, United Kingdom Amon Mpofu --- National AIDS Council of Zimbabwe, Zimbabwe Jeffrey Imai-Eaton --- Chan School of Public Health, Center for Communicable Diseases Dynamics, Harvard University, United States of America Richard Makurumidze --- Faculty of Medicine and Health Sciences, University of Zimbabwe, Zimbabwe Simbarashe Rusakaniko --- Faculty of Medicine and Health Sciences, University of Zimbabwe, ZimbabweIntroduction: Understanding how HIV epidemics are likely to behave in the future is key to informing HIV response strategies in low-income countries. Up-to-date HIV epidemiological estimates are important for policy decision- making, but surveillance data can be out of date...