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The effect of plant structure on the acceptability of different grass species to cattle
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.J. O'Reagain --- Department of Agriculture and Water Supply, Republic of South Africa M.T. Mentis --- Department of Botany, Republic of South AfricaThe changes in the acceptability to cattle of nine indigenous grass species over the grazing season were related to nine characteristics of the species. Acceptability was positively related to tuft diameter, leaf percentage, leaf table height and leaf crude protein,... -
Potassium effects on stalk strength, premature death and lodging of maize (Zea mays L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Maria Melis --- Summer Grain Sub-Centre, M. P.W. Farina --- Summer Grain Sub-Centre,In a field trial with maize, applications of potassium (K) proved to have a highly significant effect on stalk strength, premature death, root lodging and stalk breakage. A week prior to harvest the percentage of lodged plants varied from 77%... -
Causes, adverse effects and control of soil compaction
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. T.P. Bennie --- Department of Soil Science, G.N. Krynauw --- Department of Agriculture,The causes, adverse effects and control of soil compaction, with special reference to Southern African conditions, are reviewed. The main causes for soil compaction are the well-rounded and -sorted fine sand fraction of the aeolian sandy soils combined with compression... -
Penetration resistance of fine sandy apedal soils as affected by relative bulk density, water content and texture
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. T.P. Bennie --- Department of Soil Science, Republic of South Africa R. du T. Burger --- Department of Soil Science, Republic of South AfricaThe major physical properties that control the penetration resistance of soils are the degree of soil compaction, water content and particle size distribution. Sandy soils with well-sorted particle size distributions and low cohesivity compact and consolidate easily under pressure. Six... -
Effects of sodium sulphate, sodium chloride and manganese sulphate on kikuyu (Pennisetum clandestinum) growth and ion uptake
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. Mills --- Department of Soil Science, South Africa M.V. Fey --- Department of Soil Science, South Africa C.E. Johnson --- Department of Civil and Environmental Engineering, USAIrrigation with saline water is increasingly practised yet an understanding of plant response to different salt types remains largely elusive. Our study investigated the effects of irrigation with simulated effluent containing three salts on the growth and composition of a... -
The effects of soil amendments and mulch on emergence, pod development and yield of bambara groundnut (Vigna subterranea L.) in a hard-setting soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.A. Materechera --- Crop Science Department, Faculty of Agriculture, Science & Technology, Republic of South Africa B. Motsuenyane --- Crop Science Department, Faculty of Agriculture, Science & Technology, Republic of South Africa J.R. Modise --- Crop Science Department, Faculty of Agriculture, Science & Technology, Republic of South AfricaPoor crop establishment is a common problem in the soils of semi-arid areas of South Africa and is often one of the main factors limiting crop yields. Hard-setting Hutton soils (Chromic Luvisol) expose shoots of emerging crop seedlings to high... -
The Gift of Growing Up in a Same-Gendered Family: A Case Study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Carien Lubbe --- University of Pretoria,This article portrays the personal strengths of children growing up in same-gendered families from a positive psychological framework. One of the major challenges all children growing up in same-gendered families are faced with is the integration of their family experience... -
Exploring the Validity of the Values-In-Action Inventory of Strengths (VIA-IS) in an African Context
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Itumeleng P. Khumalo --- North-West University, South Africa Marie P. Wissing --- North-West University, South Africa Q. Michael Temane --- North-West University, South AfricaThis study explored the validity of the Values-In-Action Inventory of Strengths (VIA-IS) in an African context. A convenience sample of 256 African students completed the VIA-IS in English. The majority of strengths subscales had good reliability coefficients and mean scores... -
Validation of the Values in Action Inventory of Strengths for Youth (VIA-Youth) Among South African learners
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Chrizanne van Eeden --- North-West University, South Africa Marié P. Wissing --- North-West University, South Africa Jeanette Dreyer --- North-West University, South Africa Nansook Park --- University of Rhode Island, Christopher Peterson --- University of Michigan,This study investigated the reliability and validity of the Values in Action Inventory for Youth (VIA-Youth) of Park and Peterson (2006) in a total multi-cultural group of South African learners aged 13 to 17 years (N=1691: male = 703, female... -
Views from Africa on Positive Psychology
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Irma Eloff --- University of Pretoria, South Africa Mustapha Achoui --- King Fahd University of Petroleum & Minerals, Saudi Arabia Regis Chireshe --- Great Zimbabwe University, Zimbabwe Megan Mutepfa --- Zimbabwe Psychological Association, Caroline Ofovwe --- University of Benin, NigeriaThis study explored the state of Positive Psychology in six African countries. Thirty-seven participants from the six African countries responded to a survey on the status and prospects for positive psychology in the respective countries. Data was analyzed qualitatively and... -
The Design of Nail-plated Joints in Timber Structures for Strength and Stiffness
Item type: Journal Article • Journal: South African Forestry Journal • Authors: F. R.P. Pienaar --- ,The strength of a nail-plated joint depends on the angle between the load and the plate as well as on the angle between the load and the grain of the timber. It is possible to interpolate the strength values for... -
In Situ Measurements of the Acoustic Target Strength of Cape Horse Mackerel Trachurus Trachurus Capensis Off Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B. E. Axelsen G. Bauleth-D'Almeida A. KanandjemboThe acoustic target strength (TS) of Cape horse mackerel Trachurus trachurus capensis was measured in situ at 38 kHz during two surveys over the Namibian continental shelf in 1998 and 1999 using a SIMRAD EK500 echosounder/ES38D submersible split-beam transducer. Scattered... -
The effect of wind direction on flying fish counts
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PG Ryan --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, South AfricaFlying fish and squid flushed by a ship's passage are easy to count, but the value of such data is compromised by uncertainty regarding the proportion of individuals flushed. Wind direction relative to the ship's course plays an important role... -
Effect of rainfall and under-canopy vegetation on the ability to debark Eucalyptus grandis x E. camaldulensis when felled in Zululand, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Gert J. van den Berg --- , Republic of South Africa Keith M. Little --- , Republic of South AfricaThe combined effects of seasonal variation in rainfall and the presence or absence of under-canopy vegetation on soil moisture content may have a negative or positive impact on the ability to debark eucalypts. A study was initiated to investigate these... -
The pulp and paper properties of Sirex noctilio infested and fire-damagedthermomechanically pulped, South African grown Pinus patula
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M du Plessis --- , South Africa NJ le Roux --- Department of Statistics and Actuarial Science, South Africa S Gardner-Lubbe --- Department of Statistical Sciences, South Africa JPJ Swart --- Department of Forest and Wood Science, South Africa T Rypstra --- Department of Forest and Wood Science, South AfricaPinus patula is the softwood species most extensively planted in South Africa. However, large portions of these plantings are under threat from Sirex noctilio infestation and occasional forest fires. In this exploratory investigation, the effects of tree age, Sirex noctilio... -
Determining the effect of tree size, bark-wood bond strength and tree form on the productivity of an excavator-based harvester in Acacia mearnsii in the KwaZulu-Natal forestry region of South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M Ramantswana --- , South Africa A McEwan --- , South Africa J Pauw --- , South AfricaThe aim of this study was to determine the effect of tree size, bark-wood bond strength and tree form on the productivity of cut-to-length harvesting of Acacia mearnsii, using an excavator-based harvester with a SP Maskiner harvester head in the... -
Refined estimates of South African pelagic fish biomass from hydro-acoustic surveys: quantifying the effects of target strength, signal attenuation and receiver saturation
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Coetzee D Merkle CL de Moor NM Twatwa M Barange DS ButterworthThe biomass of small pelagic fish species off the coast of South Africa has been monitored since 1984 using hydro-acoustic survey techniques. These time-series of spawner biomass and recruitment estimates form the basis for management of both the South African... -
Relationship between the edgewise compression strength of corrugated board and the compression strength of liner and fluting medium papers
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: K Dimitrov --- Department of Chemical Engineering, South Africa M Heydenrych --- Department of Chemical Engineering, South AfricaThe compression strength of a corrugated board box is a direct measure of its stacking strength. The edgewise compression strength of corrugated board is the major contributor to the box stacking strength. This relation can be further extended to the... -
Organisational and individual strengths use as predictors of engagement and productivity
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Frederick W. Stander --- Optentia Research Programme, South Africa Karina Mostert --- WorkWell Research Unit, South Africa Leon T. de Beer --- WorkWell Research Unit, South AfricaThis study sought to determine whether Perceived Organisational Support for Strengths Use (POSSU) and Proactive Behaviour towards Strengths Use (PBSU) predict engagement and productivity in a sample of South African call centre operators. Participants were 218 call centre operators within... -
Understanding the association between the non-geniculate coralline red alga Spongites discoidea and the mollusc Oxystele sinensis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Eager --- Department of Biodiversity and Conservation Biology, South Africa C Puckree-Padua --- Department of Biodiversity and Conservation Biology, South Africa GW Maneveldt --- Department of Biodiversity and Conservation Biology, South AfricaNearly all adult winkles Oxystele sinensis encountered in the Kalk Bay (Western Cape province, South Africa) shallow subtidal zone were observed to bear a thick, convoluted form of the non-geniculate coralline red alga Spongites discoidea. To understand this association, various... -
Geotechnical properties of non-crystalline coastal plain sand derived lateritic soils from Ogua, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gabriel Oladapo Adeyemi --- Department of Geology, Lekan Olatayo Afolagboye --- Department of Geology, Alexandra Chinwenwa Chukwuemeka --- Department of Geology,Lateritic soils derived from coastal plain sands around Ogua, Niger Delta in Nigeria, were investigated with a view to elucidate their geotechnical characteristics, which may have influence on their engineering applications. The geotechnical properties of these soils (their compaction parameters,... -
Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise Psammobates geometricus
Item type: Journal Article • Journal: African Zoology • Authors: Ronald A. Balsamo --- Department of Biology, U.S.A Margaretha D. Hofmeyr --- Chelonian Biodiversity and Conservation, Department of Biodiversity and Conservation Biology, South Africa Brian T. Henen --- Chelonian Biodiversity and Conservation, Department of Biodiversity and Conservation Biology, South Africa Aaron M. Bauer --- Department of Biology, U.S.AFood and non food plant characteristics were studied for the geometric tortoise, Psammobates geometricus, to test the hypothesis that feeding preferences in tortoises may be influenced by the mechanical properties of plant leaves. Twelve focal feeding observations made between 8... -
Strength and stiffness capacity utilisation of timber members in roof truss structures
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: C Brand Wessels --- Department of Forest and Wood Science, South Africa Nils-Olaf Petersen --- Department of Forest and Wood Science, South AfricaThe main objective of this study was to determine which property, of the six strength and stiffness properties used in structural timber design, was the most influential in the design of nail-plated roof trusses. Thirty recently completed nail-plated roof truss... -
Using Rasch modelling to examine the international personality item pool (IPIP) values in action (VIA) measure of character strengths
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Graham A. du Plessis --- Department of Psychology, South Africa Gideon P. de Bruin --- Department of Psychology, South AfricaThis paper investigates the psychometric properties of the values in action (VIA) character strengths (Peterson and Seligman, 2004). A sample of 904 South African undergraduate students (female=77%, male=23%, black=70%, mean age=21.07 years, SD age=2.73 years) was assessed using a 380-item... -
Strengthening Capacity for Agribusiness Development and Management in Sub-Saharan Africa
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Suresh Chandra Babu --- Capacity Strengthening Program, USA Rupak Manvatkar --- World Food Programme, Italy Shashidhara Kolavalli --- Ghana Strategy Support Program, GhanaIn sub-Saharan Africa, agribusiness has a major role to play in the transformation of the agricultural sector. The demand for high-value food products is increasing, creating an opportunity for the production and export of these goods. To capture the benefits... -
The potential of young, green finger-jointed Eucalyptus grandis lumber for roof truss manufacturing
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Philip L Crafford --- Department of Forest and Wood Science, South Africa C Brand Wessels --- Department of Forest and Wood Science, South AfricaSouth Africa is a timber-scarce country that will most probably experience a shortage of structural softwood lumber in the near future. In this study the concept of using young, green finger-jointed Eucalyptus grandis lumber was evaluated for possible application in... -
Strengths use and deficit improvement: The relationship with engagement and fit with study course amongst first-year students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Gabrielle van Niekerk --- WorkWell Research Unit for Economic and Management Sciences, South Africa Karina Mostert --- WorkWell Research Unit for Economic and Management Sciences, South Africa Leon T. de Beer --- WorkWell Research Unit for Economic and Management Sciences, South AfricaThis study sought to test a model of students’ proactive behaviour to use their strengths and improve their deficits and how this relates with their self-reported perceptions of their fit with a study course and engagement. Participants were 692 first-year... -
The mediating effect of leader-member exchange between strengths use and work engagement
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Crizelle Els --- WorkWell Research Unit, South Africa Jolandie Viljoen --- School of Human Resource Sciences, South Africa Leon de Beer --- WorkWell Research Unit, South Africa Lelani Brand-Labuschagne --- WorkWell Research Unit, South AfricaThis study investigated the mediating effect of leader-member exchange (LMX) (as perceived by subordinates) in the relationship between strengths use and work engagement. Participants numbered 213 employees in a South African financial organisation (females=53.10%, blacks=19.40%). Data on their perceptions of... -
Mytilus galloprovincialis (Mollusca: Bivalvia) in a warm-temperate South African estuarine embayment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Pollard --- Department of Zoology and Entomology, Knysna Basin Project, South Africa AN Hodgson --- Department of Zoology and Entomology, Knysna Basin Project, South AfricaThe distribution, population structure, condition and gonad indices, and the attachment strengths of the invasive Mediterranean mussel Mytilus galloprovincialis are described from the Knysna Estuary, South Africa. Mussels were found in the rocky intertidal at the mouth of the estuary... -
Modelling the effects of petroleum product contaminated sand on the compressive strength of concretes using fuzzy logic and artificial neural networks: A case study of diesel
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Chidozie Chukwuemeka Nwobi-Okoye --- Faculty of Engineering, Nigeria Ikechukwu Etienne Umeonyiagu --- Department of Civil Engineering, NigeriaIn this study an artificial neural network (ANN) and fuzzy logic (FL) were used to predict the compressive strength of concrete produced with diesel contaminated sand. Concrete was produced using sand contaminated with diesel at 0, 0.5, 1, 1.5, 2,... -
Effect of rubber crumb on the microstructural properties of concrete
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: J.O. Akinyele --- Department of Civil Engineering, South Africa R.W. Salim --- Department of Civil Engineering, South Africa W.K. Kupolati --- Department of Civil Engineering, South AfricaThis study evaluates the effect of rubber crumb on the microstructural properties of concrete which was used to partially replace fine aggregate by 0, 4, 8, 12, and 16% proportion and designated as M0, M4, M8, M12, and M16 respectively... -
Stabilization of lateritic soil with pulverized palm kernel shell (PPKS) for road construction
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Adeyemi Adeboje --- Department of Civil Engineering, South Africa Williams Kupolati --- Department of Civil Engineering, South Africa Emmanuel Sadiku --- Department of Chemical, Metallurgical and Materials Engineering, South Africa Julius Ndambuki --- Department of Civil Engineering, South Africa Chewe Kambole --- Department of Civil Engineering, South Africa Oladapo Ogunleye --- Department of Civil and Environmental Engineering, NigeriaThis paper discusses the stabilization of lateritic soil with pulverized palm kernel shell (PPKS), an agricultural waste, for road construction. Samples of lateritic soil with the addition of 5.00–12.50% PPKS at an increment of 2.50% were prepared for index and... -
“Carrying the culture … ”: Ethnic identity development in black African adolescents
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Jolandie du Plessis --- Department of Psychology, South Africa Luzelle Naudé --- Department of Psychology, South AfricaThis study explored the ethnic identity exploration, commitment, and strength statuses in black African adolescents from the central region of South Africa. A total of 388 adolescents were recruited for this study (females = 66.24%; age range 13 to 21;... -
Acoustic fish biomass assessment in a deep Tunisian reservoir: effects of season and diel rhythm on survey results
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I Djemali --- Institut National des Sciences et Technologies de la Mer, Tunisia H Laouar --- Centre Technique de l’Aquaculture, TunisiaTo determine the best acoustic sampling period for obtaining fish biomass estimates of a Mediterranean deep reservoir in Tunisia, day and night surveys were performed in spring (April), summer (September), autumn (December) and winter (March). A Simrad EK60 echosounder, equipped... -
Experimental comparison of selected pozzolanic materials
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: K. A. Olonade --- Department of Civil Engineering, Nigeria M. B. Jaji --- Department of Civil Engineering, Nigeria O. A. Adekitan --- Department of Civil Engineering, NigeriaDifferent pozzolanic materials are commonly used in concrete production with different properties. This paper compared the performance of metakaoline (MTK), bamboo leaf ash (BLA), pulverized fly ash (PFA) and corn cob ash (CCA), when used as partial replacement for cement... -
Utilization of pulverized cow bone (PCB) for stabilizing lateritic soil for road work
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Adeyemi Adeboje --- Department of Civil Engineering, South Africa Williams Kupolati --- Department of Civil Engineering, South Africa Rotimi Sadiku --- Department of Chemical, Metallurgical and Materials Engineering, South Africa Julius Ndambuki --- Department of Civil Engineering, South Africa Dolapo Yussuf --- Department of Civil and Environmental Engineering, Nigeria Chewe Kambole --- Department of Civil Engineering, South AfricaThis research explored the possibility of improving the engineering properties of lateritic soil with pulverized cow bone (PCB), a processed animal waste obtained from slaughtered cows, for road construction. The effects of PCB on the lateritic soil samples were evaluated... -
Promoting mental health of students living with HIV using appreciative inquiry
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Teolene Diedricks --- Department of Educational Psychology, South Africa Christoffel Myburgh --- Department of Educational Psychology, South Africa Marie Poggenpoel --- Department of Educational Psychology, South AfricaLiving with HIV poses many challenges. This is especially true for students living with HIV (SLHIV) within a university setting. The challenges faced by SLHIV makes it difficult for them to see new possibilities in living with the virus. The... -
The association between calf circumference and appendicular skeletal muscle mass index of black urban women in Tlokwe City
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: PO Ukegbu --- Centre of Excellence for Nutrition, South Africa HS Kruger --- Centre of Excellence for Nutrition, South Africa JD Meyer --- Centre of Excellence for Nutrition, South Africa C Nienaber-Rousseau --- Centre of Excellence for Nutrition, South Africa C Botha-Ravyse --- Centre of Excellence for Nutrition, South Africa SJ Moss --- Physical Activity, Sport and Recreation Sciences, South Africa MI Kruger --- Africa Unit for Transdisciplinary Health Research, South AfricaBackground: Sarcopenia, the loss of muscle mass and strength, is associated with adverse health outcomes. Calf circumference (CC) has been proposed as a surrogate measure of muscle mass in the elderly; however, ethnic/sex specific cut-off values remain to be established. -
The effect of crushed plastics waste on the structural properties of sandcrete blocks
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: J. O. Akinyele --- Department of Civil Engineering, Nigeria I. O. Toriola --- Department of Civil Engineering, NigeriaThe need for proper disposal of plastic waste has prompted researchers to consider the best way of recycling this non-biodegradable material. This research has looked into the production of sandcrete blocks, using shredded waste plastic in replacing fine aggregate at... -
Effect of counselling on the family function of intimate partner violence victims attending antenatal clinic in a tertiary hospital in North Central Nigeria
Item type: Journal Article • Journal: South African Family Practice • Authors: BO Akor --- Department of Family Medicine, Nigeria LA Moses --- Department of Family Medicine, Nigeria ND Baamlong --- Department of Family Medicine, Nigeria LL Shedul --- Department of Family Medicine, Nigeria AS Haruna --- Department of Family Medicine, Nigeria JM Abu --- Department of Family Medicine, Nigeria OU Chira --- Department of Family Medicine, Nigeria NR Ripiye --- Department of Family Medicine, Nigeria RA Abdulkareem --- Department of Family Medicine, NigeriaBackground and aim: Intimate partner violence (IPV) is a global problem. Family dysfunction is an integral characteristic of IPV homes. However, not much has been done regarding restoration of these families. The aim of this study was to explore the... -
Effect of cassava starch on shrinkage characteristics of concrete
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Akindehinde Ayotunde Akindahunsi --- Department of Civil Engineering, Nigeria Wolfram Schmidt --- BAM Federal Institute for Materials Research and Testing, GermanyThe use of starch and its derivatives in concrete as an admixture to modify relevant properties of concrete has been on the increase in recent times. It is known to modify the rheology, affect the hydration kinetics of cement, and... -
Rice husk ash as a sustainable supplementary cementitious material for improved concrete properties
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Nsesheye Susan Msinjili --- Division 7.4 - Technology of Construction Materials, Germany Wolfram Schmidt --- Division 7.4 - Technology of Construction Materials, Germany Andreas Rogge --- Division 7.4 - Technology of Construction Materials, Germany Hans-Carsten Kühne --- Division 7.4 - Technology of Construction Materials, GermanyThere is a wide range of research worldwide on supplementary cementitious materials (SCMs) such as fly ash, slag and silica fumes that have pozzolanic properties sufficient for substituting ordinary Portland cement (OPC). These SCMs are known to significantly improve concrete... -
Using acoustic wave velocity to select fibre-managed plantation Eucalyptus nitens logs for laminated veneer lumber products
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: David Blackburn --- Centre for Sustainable Architecture with Wood (CSAW), School of Architecture and Design, Australia Mario Vega --- Centre for Sustainable Architecture with Wood (CSAW), School of Architecture and Design, Australia Gregory Nolan --- Centre for Sustainable Architecture with Wood (CSAW), School of Architecture and Design, AustraliaThe aims and objectives of this study were to investigate the potential to predict laminated veneer lumber (LVL) stiffness from wood properties measured on trees and logs, and determine variation in log, wood and veneer properties as a function of... -
Profiling work-related signature strengths of “Born Free” South Africans: A gender perspective
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Ita Geyser --- Department of Hospitality and Tourism Management (STH), South Africa Madelyn Geldenhuys --- Department of Industrial Psychology and People Management (IPPM), South AfricaThis study investigated the importance of signature strengths of South African trainees in the hospitality industry who are the “Born Free” generation, who have only lived in a democracy, and were given equal opportunities. Utilising a cross-sectional research design, we... -
Can core self-evaluations promote employee strengths use?
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: He Ding --- School of Economics and Management, China Xinqi Lin --- School of Labor and Human Resources, ChinaThis study attempted to explore the impact of core self-evaluations (CSE) on employee strengths use, as well as the moderating effect of perceived organisational support for strengths use (POS for strengths use) on the relationship. We hypothesised and tested a... -
Preliminary retting research on different kenaf cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mathilda M van der Westhuizen --- Agricultural Research Council–Institute for Industrial Crops, South AfricaKenaf (Hibiscus cannabinus L.), a fibre crop, is a member of the Malvaceae family and related to cotton (Gossipium hirsutum L.) and okra (Abelmoschus esculentus (L.) Moench). Natural fibres have many advantages over synthetic fibres, such as light weight, low... -
Abusive supervision and work engagement in the Nigerian public service sector: Do strengths use, and promotion focus matter?
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Adeline N. Idike --- , Nigeria Okechukwu Ibiam Egwu --- , Nigeria Fabian O. Ugwu --- , Nigeria Cornelius O. Okorie --- , Nigeria Francis A. Akwara --- , NigeriaThis study examined experiences of abuse and work engagement behaviours of general employees in the Nigerian public service sector. Cross-lagged survey data were collected from 219 workers (female = 57.3%; age range = 24 – 59 years, mean age =... -
How and when does perceived supervisor support for strengths use influence employee strengths use? The roles of positive affect and self-efficacy
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: He Ding --- , China Enhai Yu --- , ChinaThe present study sought to investigate how positive affect would mediate the relationship between employee perceived supervisor support for strengths use (PSSSU) and actual employee strengths use as well as the moderating effect of self-efficacy on the relationship. We gathered... -
Evaluation of temperature effects on grade 20 concrete using response surface methodology
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Richie I. Umasabor --- , NigeriaThis paper examined the evaluation of temperature effects on grade 20 concrete using response surface methodology. An experimental research design was adopted, which produced fifty-one (51) concrete specimens. The specimens were cured and tested at 7, 18, and 28 days,... -
Solid wood property variations in early-age Acacia plantation trees grown in southern Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: David Blackburn --- , Australia Vu Dinh Huong --- , Vietnam Nguyen Duc Thanh --- , Vietnam Daniel Mendham --- , AustraliaA high demand for woodchips has encouraged smallholder farmers in Vietnam to invest in short-rotation Acacia plantations to produce pulpwood that has a relatively quick, though often low, income return. Because of an expanding export furniture industry, the Vietnam Government... -
The psychology of sustainability and sustainable development: Transdisciplinary perspectives
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Annamaria Di Fabio --- , ItalyThe study outlines the pillars of the psychology of sustainability and sustainable development. It applies a transdisciplinary approach to explore how the psychology of sustainability and sustainable development provides a common language for constructing well-being and quality-of-life of populations, regarding... -
Investigation of green-glued laminated timber from the Congo Basin: durability, mechanical strength and variability trends of the bondlines
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: René Oum Lissouck --- University of Yaoundé I, Cameroon Rachel Raïssa Ngono Mvondo --- Institute of Wood Technology, University of Yaoundé I, Cameroon François René Ateba --- Institute of Wood Technology, University of Yaoundé I, Cameroon Regis Pommier --- University of Bordeaux, FranceThe development of glulam may give complementary, added-value to an important part of the timber production in the Congo Basin. Nevertheless, the high humidity in which these timbers operate may cause problems such as cracks and severe deformations if they... -
Chameleons and vineyards in the Western Cape of South Africa: Is automated grape harvesting a threat to the Cape Dwarf Chameleon (Bradypodion pumilum)?
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: KrystalA. Tolley --- South African National Biodiversity Institute, South Africa G. John Measey --- University of the Western Cape, South AfricaThe use of automated grape harvesters in the Cape Wine Growing region has resulted in controversy regarding their effect on the chameleon Bradypodion pumilum. We investigated densities of B. pumilum during harvesting at a vineyard near Stellenbosch, South Africa. During... -
Tropical wood species: alternative model to determine the characteristic compressive strength perpendicular to grain
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Arthur Filipe Freire Gomes --- Federal University of São Carlos (UFSCar), Brazil Fernando Júnior Resende Macarenhas --- Rua Luís Reis Santos - Pólo II, University of Coimbra, Portugal Diego Henrique de Almeida --- Federal University of São Carlos (UFSCar), Brazil Alfredo Manuel Pereira Geraldes Dias --- Rua Luís Reis Santos - Pólo II, University of Coimbra, Portugal Tulio Hallak Panzera --- Federal University of São João Del Rey (UFSJ), Brazil Francisco Antônio Rocco Lahr --- University of São Paulo (USP), Brazil André Luis Christoforo --- Federal University of São Carlos (UFSCar), BrazilBrazil has a vast area of native forests with the potential to be sustainably exploited for application in civil construction. Density is a key factor when analysing the characteristics of different wood species and their future uses, and additionally it... -
Strengths-based human resource system and organisational citizenship behaviour: Mediation by organisational support and moderation by tenure
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: He Ding --- North China Electric Power University, China Meng Zhang --- North China Electric Power University, China Enhai Yu --- North China Electric Power University, ChinaThis study explored perceived organisational support (POS) mediation and the role of organisational tenure moderation in the relationship between the perceived strengths-based human resource (HR) system and organisational citizenship behaviour (OCB). We collected data from 216 Chinese employees in different... -
Strengths use and deficit improvement of first-year university students: A structural model for social support and student outcomes
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karina Mostert --- North-West University, South Africa Charlize Du Toit --- North-West University, South AfricaThis study aimed to examine first-year students’ proactive behaviour towards strengths use (PBSU) and deficit improvement (PBDI), their relationship with students’ social support and essential student outcomes (student burnout, student engagement, life satisfaction, satisfaction with studies, study–course fit and intention... -
Linking servant leadership to work strains: The mediating effect of strengths use
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Nan Wang --- Renmin University of China, China Yuxiang Luan --- Renmin University of China, China Rui Ma --- North Minzu University, ChinaThe current study examined the relationship between servant leadership and employees’ work strain, as well as the mediating role of strengths use in that relationship. Participants were 179 Chinese employees (female = 49%; mean age = 27 years; mean tenure... -
Strengths use in the workplace: A meta-analysis
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: --- School of Labor and Human Resources, Renmin University of China, China --- School of Labor and Human Resources, Renmin University of China, China --- School of Labor and Human Resources, Renmin University of China, China --- School of Labor and Human Resources, Renmin University of China, ChinaThis meta-analysis aimed to clarify the relationship between perceived organisational support and core self-evaluations and strengths use and task performance outcomes utilising a cross-temporal versus time-lagged research design. Drawing on the random effects model, this study combined 44 effect sizes... -
Humble leadership and follower strengths use: Leader-member exchange as a mediator and role overload as a moderator
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: --- School of Economics and Management, North China Electric Power University, China --- School of Economics and Management, North China Electric Power University, China --- School of Economics and Management, North China Electric Power University, ChinaBased on the conservation of resources (COR) theory, this study explores the mediating effect of leader-member exchange (LMX) and the moderating effect of role overload in the relationship between humble leadership and follower strengths use. We collected data from 230... -
Acoustic assessment of the biomass of aggregated chokka squid Loligo reynaudii on its inshore spawning grounds on the southeast coast of South Africa in the season closed for fishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: I Hampton --- , South Africa MA Soule --- , South Africa J Mwicigi --- , South AfricaRecent attempts to estimate the biomass of chokka squid Loligo reynaudii on the southeast coast of South Africa by acoustic surveys of the inshore jig-fishing area are described. Pilot surveys of aggregations, covering part of the fishing grounds, were conducted... -
Strengths mindset and job satisfaction: The mediating role of thriving at work and the moderating role of authentic leadership
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Yang Liu --- North China Electric Power University, China Shunkun Yu --- North China Electric Power University, China He Ding --- North China Electric Power University, ChinaWe examined whether thriving at work mediated the relationship between strengths mindset and job satisfaction, as well as the moderating role of authentic leadership within this relationship. Data were gathered from 717 employees (female = 46%; mean age = 31.77... -
Giving adolescent girls and young women a foothold: Economic strengthening as a key protection strategy against HIV infection in South Africa
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Andrew Hartnack --- University of the Free State, South Africa Jenny Mcloughlin --- For TB HIV CARE, Anje Pretorius --- For TB HIV CARE, Harry Hausler --- For TB HIV CARE,This paper focused on the prevention of HIV transmission for adolescent girls and young women (AGYW), through a layered approach which included economic strengthening as a core strategy, especially for the most vulnerable. Based on multi-year data in KwaZulu-Natal, South...