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Genetic Improvement of Timber Yield and Wood Quality in Eucalyptus Grandis (Hill) Maiden
Item type: Journal Article • Journal: South African Forestry Journal • Authors: G. van Wyk --- Division of Forest Science and Technology,Results of a partial diallel progeny test of Eucalyptus grandis assessed at ages 5, 36, 60 and 105 months are presented. Large genetic variations among full-sib families were found for all traits studied, e.g. the mean tree volume per family... -
Reciprocal differences in intraspecies crosses of tobacco (Nicotiana tabacum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.G. van Heerden --- , Republic of South Africa M.P. Lamprecht --- , Republic of South Africa H. van Ark --- , Republic of South AfricaReciprocal differences in a diallel cross experiment with air-cured tobacco strains were found to be significant for certain characteristics, but relatively small compared to differences between strains in general combining ability. A factorial analysis designed to detect maternal effects in... -
Higher Derivations and a Theorem By Herstein
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Miguel Ferrero Claus HaetingerIn this paper we extend to the higher derivations a well-known result proved by Herstein concerning derivations in prime rings. We prove results which imply that every Jordan higher derivation of a 2-torsion-free semiprime ring is a higher derivation. -
An Algebraic Characterization of Blumberg Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: M.R. Ahmadi Zand --- Department of Mathematics, IranLet X be a topological space and let C(X) be the ring of continuous real-valued functions on X. We study T′(X) as an over-ring of C(X), where T′(X) denotes the set of all real-valued functions on X such that for... -
On Prime and Semiprime Near-Rings with Generalized Derivation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Öznur Gölbaşi --- Department of Mathematics, TurkeyLet 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... -
HIV/AIDS, the erosion of social capital and the collapse of rural livelihoods in the Nkomazi district of South Africa
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Hannah Dawson --- University of Johannesburg, South AfricaHIV/AIDS is a major driver of livelihood insecurity. The AIDS epidemic, through the death or disability of economically productive adults, destabilises and erodes the social networks which sustain the livelihoods of vulnerable households. This paper draws upon research with home-based... -
Dealing and sharing: the construction of community in a Pretoria public park
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Dennis Edward Webster --- Department of Anthropology and Archaeology, South AfricaThis paper describes how a group of men, who are invisible to the state because they possess no formal legal documentation, such as ID books or passports, and do not take part in the formal economy, live in a public... -
Exploring the impact of the constructs of the three-domain approach on private social and commercial hospitality provision
Item type: Journal Article • Journal: • Authors: Barry O’Mahony --- Department of Marketing, Tourism and Social Impact, Swinburne University of Technology, Melbourne, AustraliaThis article explores the constructs of private social and commercial hospitality in a panoramic examination of the impact and potential future development of the three-domain approach. Focused primarily (but not exclusively) on the books In Search of Hospitality: theoretical perspectives... -
The economic importance and impacts of intellectual property rights (IPRs) in Sudan
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Samia Satti Osman Mohamed Nour --- UNU-MERIT, School of Business and Economics, The NetherlandsThis paper explains the importance of IPRs and examines the factors hindering and those contributing toward enhancing IPRs in Sudan. We find that the inadequacy of IPRs protection in Sudan is attributed to low integration in the international institutions, lack... -
Grief-stricken: Zimbabwean children in everyday extremity and the ethics of research
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Ross Parsons --- Dept. Anthropology, USAThe essay approaches ethics and research through a description of the beginnings of a study of children's lives under extreme adversity in the Manicaland province of contemporary Zimbabwe. An encounter with an orphaned child is described, highlighting the presence of... -
Costs associated with tail autotomy in an ambush foraging lizard, Cordylus melanotus melanotus
Item type: Journal Article • Journal: African Zoology • Authors: Suzanne McConnachie --- Communication and Behaviour Research Group, School of Animal, Plant and Environmental Sciences, South Africa Martin J. Whiting --- Communication and Behaviour Research Group, School of Animal, Plant and Environmental Sciences, South AfricaTail autotomy is a widespread method of escape among lizards and can be costly. Most studies on the effects of tail loss have focused on active foraging lizards, but few data exist for ambush foraging lizards. We investigated potential costsassociated... -
Caring and connectedness in the context of domestic worker employment in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Christel Marais --- Department of Human Resource Management,This study investigated workplace relational connectedness qualities in terms of domestic worker employment in a South African setting. Twenty black female domestic workers were recruited through purposive respondent-driven self-sampling. Participants ranged in age from 27 to 59 years. Semi-structured in-depth... -
Design of a hand water pump using a quick-return crank mechanism
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: C. A. Okoronkwo --- Department of Mechanical Engineering, Nigeria B. O. Ezurike --- Department of Mechanical Engineering, Nigeria R. Uche --- Department of Mechanical Engineering, Nigeria J. O. Igbokwe --- Department of Mechanical Engineering, Nigeria O. N. Oguoma --- Department of Mechanical Engineering, NigeriaThe detailed design procedure for a quick-return mechanism hand water pump is presented. The system designed is basically a modification to reciprocating lift pumps also known as India mark III. The modified pump is operated by the up and down... -
Climate change and intellectual property rights in Africa: Environmental necessity-economic opportunity
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Maruf Sanni --- National Centre for Technology Management, Federal Ministry of Science and Technology, Nigeria Caleb M. Adelowo --- National Centre for Technology Management, Federal Ministry of Science and Technology, Nigeria David A. Ogunkanbi --- National Centre for Technology Management, Federal Ministry of Science and Technology, Nigeria Adesina A. Oyewale --- National Centre for Technology Management, Federal Ministry of Science and Technology, Nigeria Abolaji D. Dada --- Department of Entrepreneurship Management Technology, Nigeria Bamidele R. Muritala --- National Centre for Technology Management, Federal Ministry of Science and Technology, NigeriaPromoting the development of clean technologies is critical in achieving a low-carbon economy in Africa. The objective of this paper is to shed more light on the role of IPRs in the efforts to mitigate climate change in Africa. This... -
Exploring the impact of the constructs of the three-domain approach on private social and commercial hospitality provision
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Barry O'Mahony --- Department of Marketing, Tourism and Social Impact, AustraliaThis article explores the constructs of private social and commercial hospitality in a panoramic examination of the impact and potential future development of the three-domain approach. Focused primarily (but not exclusively) on the books In Search of Hospitality: theoretical perspectives... -
Role of reciprocity and innovativeness on performance in a developing context: Empirical evidence from Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Shogo Mlozi --- Department of Tourism, Tanzania Ossi Pesämaa --- Accounting and Control, Sweden Sarah Jack --- Department of Entrepreneurship, Strategy and Innovation, UKGenerally, investors tend to invest when likelihood of success is high. Many investors consider Africa as one market and neglect individual differences among African countries. Africa is mostly considered a high-risk market and conceptually innovativeness involves uncertainty, which precedes risk... -
Reciprocal altruism: It’s relationship to locus of control and dispositional optimism among Nigerian undergraduates
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Olukayode AyoOluwa Afolabi --- Department of Pure and Applied Psychology, Nigeria Uba Dennis --- Department of Pure and Applied Psychology, NigeriaThe study examined locus of control and dispositional optimism influences on reciprocal altruism among Nigerian university undergraduate students. Participants consisted of 253 undergraduate students in their second year of study (males = 151 (60%), females = 102 (40%); mean age... -
Mediated mutual reciprocity in the process of African children’s social ontogenesis
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Therese Mungah Shalo Tchombe --- Center for Research in Child and Family Development and Education (CRCFDE), CameroonThe paper highlights Nsamenang’s social ontogenesis theoretical stance in explaining how participatory pedagogies in socialisation impact not only development but children’s capacity to assume responsibilities for their own development. A synoptic review is presented of widely discussed challenges faced by... -
“Do unto others what you want … ”: Reciprocity and childcare in the Kumasi metropolis of Ghana
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Samuel Asiedu Owusu --- Directorate of Research, Innovation and Consultancy, GhanaThis exploratory study aimed to assess reciprocity qualities in childcare and likely influences on child health outcomes. Informants were 83 child caregivers from the Kumasi metropolis of Ghana. Of these, 56 individual maternal (n = 28) and non-maternal child caregivers (n = 28) completed... -
The role of “food” in network formation and the social integration of undocumented Zimbabwean migrant farmworkers in the Blouberg-Molemole area of Limpopo, South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Denboy Kudejira --- , CanadaThis article examines the role of food in mediating social relations between undocumented Zimbabwean migrant farmworkers and other Zimbabweans living and working in the Blouberg and Molemole local municipalities in Limpopo province, South Africa. Based on ethnographic research, the article... -
Network Novel: Ngũgĩ wa Thiongo’s Wizard of the Crow and Dialogues in African Literature
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Charles Kipng’eno Rono --- , KenyaThis essay reads Ngũgĩ wa Thiongo’s Wizard of the Crow (2006) as an intervention in the ongoing dialogues in African literature. Through the paradigms of ‘reciprocality’, ‘extensibility’ and ‘reconfigurability’, the essay gauges the impacts of dialoguing on the readings of... -
Building bridges: how hospitality can foster positive peace
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Latifa Benhadda --- NHLStenden University of Applied Sciences, The Netherlands Rainer Prasetya --- NHLStenden University of Applied Sciences, The NetherlandsThis opinion piece explores the relationship between hospitality and positive peace from a social and ethical perspective, focusing on human dignity, justice and care. It argues that hospitality, beyond its commercial lens, should be viewed through the interaction between host... -
On z-ideals and z-closure operations of semirings, I
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Amartya Goswami --- University of Johannesburg, South AfricaThe aim of this series of papers is to study z-ideals of semirings. In this article, we introduce some distinguished classes of z-ideals of semirings, which include z-prime, z-semiprime, z-irreducible, and z-strongly irreducible ideals and study some of their properties... -
Nil Modules and the Envelope of a Submodule
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: David Ssevviiri --- Makerere University, Uganda Annet Kyomuhangi --- Busitema University, UgandaLet R be a commutative unital ring and N be a submodule of an R-module M. We show that: 1) the semiprime radical is an invariant on submodules generated by the ascending chain of envelopes of a given submodule; 2)... -
On the location of ratios of zeros of special trinomials
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: I. Ndikubwayo --- Makerere University, Uganda A.S. Bamunoba --- Lira University, UgandaGiven coprime integers k, ℓ with k > ℓ ⩾ 1, and arbitrary complex polynomials A(z) and B(z) such that deg(A(z)B(z)) ⩾ 1, we consider the polynomial sequence {Pn (z)} satisfying the three-term recurrence relation