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PREDICTION OF SURFACE WATER TEMPERATURE OF SOUTH AFRICAN IMPOUNDMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.J. van Schalkwyk --- Department of Mathematical Statistics, Republic of South Africa R.D. Walmsley --- Department of Plant Schiences, Republic of South AfricaTemperature data for 18 South African impoundments were evaluated against Straskraba's global surface water predictive model. All impoundments exhibited quantifiable sinusoidal annual temperature variations which allowed for good predictive capabilities using Straskraba's empirical approach. For each impoundment coefficients for input... -
Development of a ground truthing method for determination of rangeland biomass using canopy reflectance properties
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: L. GerberVeld condition assessment and establishment of grazing capacity norms provide guidelines for the formulation of sustainable practices. However, conventional monitoring methods are becoming inadequate to meet future challenges, where quantification of spatial and temporal variation is required. This study proposes... -
Production and physiological responses of Italian ryegrass and white clover grown in monocultures and mixed stands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: L. Gerber J.J. GerberRyegrass and clover, when grown under optimal conditions in mixed stands interact in response to available light energy. With other resources non-limiting, pasture production is determined by the efficiency with which solar radiation is intercepted by canopies and converted into... -
Lines around fragments: effects of fencing on large herbivores
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: RandallB Boone N Thompson HobbsPeople construct fences to delineate land ownership and to control access to land. Fences accomplish several purposes, notable among these are containing livestock or wildlife raised for profit or subsistence, excluding use of vegetation within areas to be conserved and... -
Climate variability and impacts on east African livestock herders: the Maasai of Ngorongoro Conservation Area, Tanzania
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KathleenA Galvin PhilipK Thornton RandallB Boone Jennifer SunderlandEast African pastoral adaptation and vulnerability to climate variability and climate change is assessed, using data from decisionmaking processes and ecological data of the Maasai of Ngorongoro Conservation Area as an example. The paper uses integrated modeling, linking PHEWS, a... -
Measurement Equivalence of the South African Psychological Ownership Questionnaire for Diverse South African Cultural Groups
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Chantal Olckers --- University of Pretoria, Pieter Schaap --- University of Pretoria,This study determined the measurement equivalence of the South African Psychological Ownership Questionnaire (SAPOS) for black and white South African employees. Participants were a non-probability sample of 645 professional level employees from both the private and the public sector (59.4%... -
Oualidia lagoon, Morocco: an estuary without a river
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Hilmi VG Koutitonsky A Orbi JI Lakhdar M ChagdaliThis study describes some physical oceanography features of an estuary maintained by fresh groundwater inflow. The mesoscale variability of currents, temperature and salinity are documented from moored current meter observations of 12 days duration at three stations. Current speeds exceeded... -
Tree taper models for Cupressus lusitanica plantations in Ethiopia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Leakemariam Berhe Göran ArnoldssonTo provide a taper model for planning and management of Cupressus lusitanica plantations in Ethiopia, seven taper models were compared. Four performance indicator statistics were used for comparing the models in their ability to estimate tree diameter, and total and... -
The end of AIDS: Possibility or pipe dream? A tale of transitions
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Alan Whiteside --- Basillie School of International Affairs and Wilfrid Laurier University, Canada Michael Strauss --- Health Economics and HIV/AIDs Research Division (HEARD), South AfricaGlobally, in the last 20 years health has improved. In this generally optimistic setting HIV and AIDS accounts for the fastest growing burden of disease. The data show the bulk of this is experienced in Southern Africa. In this region,... -
Emotional load and social support as indicators of bullying at work
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Leon T. de Beer --- WorkWell Research Unit, South AfricaThis study sought to ascertain whether elevated emotional load and a lack of social support could be indicative of bullying at work. Participants totalled 1442 employees from the manufacturing industry in South Africa. Data on emotional load, social support, and... -
Pathways to violence propensity: Results from a two-wave study of young males in urban South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Ian Edelstein --- Human Sciences Research Council, South AfricaThe aim of this study was to model pathways to violence propensity and violent behaviour among boys and young men in a high-violence community in South Africa. To that end, 284 young males (11 to 23 years old) from Khayelitsha,... -
Allometric relationships to predict aboveground biomass of 8–10-year-old Eucalyptus grandis × E. nitens in south-eastern Mpumalanga, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: PB van Niekerk --- , South Africa DM Drew --- , South Africa SB Dovey --- , South Africa B du Toit --- , South AfricaSouth Africa is new to the implementation of climate change policies, and the forestry sector in this country is taking ownership of estimating its greenhouse gas inventories. Improving the level of accuracy of carbon stock estimations calls for the population... -
Firm-specific orientations and manufacturing capability under institutional voids
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Deusdedit Augustine Rwehumbiza --- , United Republic of TanzaniaManufacturing capability (MC) is widely considered to depend on a strategic orientation of firms and institutional support. Remarkably, little is known about the influence of firm-specific orientations on manufacturing capability under institutional voids. This study examines the extent to which... -
Social capital and project management success in a developing country environment: Mediating role of knowledge management
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Kwasi Amoako-Gyampah --- , USA Moses Acquaah --- , USA Ebenezer Adaku --- , Ghana Samuel Famiyeh --- , GhanaDespite significant investments in projects by organizations, governments, and international development agencies in developing countries, many of the projects have failed and continue to fail due to budget overruns, inability to complete projects on time, and poor-quality outcomes. We draw... -
Gender differences in the pathway of childhood trauma, impulsivity and adult eating behaviour: a cross-sectional study
Item type: Journal Article • Journal: Journal of Child & Adolescent Mental Health • Authors: Antônio Bonfada Collares Machado --- Institute of Psychology, Federal University of Rio Grande do Sul, Brazil Katia Irie Teruya --- Institute of Psychology, Federal University of Rio Grande do Sul, Brazil Rogério Friedman --- Universidade Federal do Rio Grande do Sul, Brazil Gibson Juliano Weydmann --- Institute of Psychology, Federal University of Rio Grande do Sul, Brazil Eduardo Remor --- Institute of Psychology, Federal University of Rio Grande do Sul, Brazil Lisiane Bizarro --- Institute of Psychology, Federal University of Rio Grande do Sul, BrazilObjective: The current cross-sectional study aimed to examine the association between childhood trauma, impulsivity, binge eating symptoms, and body mass index (BMI) in a sample of males and females. We also aimed to investigate the indirect association of childhood trauma...