WIReDSpace

Welcome to WIReDSpace(Wits Institutional Repository on DSpace)

For queries relating to content and technical issues, please contact IR specialists via this email address : openscholarship.library@wits.ac.za, Tel: 011 717 4652 or 011 717 1954

 

Communities in WIReDSpace

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Now showing 1 - 5 of 19

Recent Submissions

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Effective practices of international volunteering for health: perspectives from partner organizations
(BMC, 2018) Lough, Benjamin J.; Tiessen, Rebecca; Lasker, Judith N.
Background: The demand for international volunteer experiences to promote global health and nutrition is increasing and numerous studies have documented the experiences of the international volunteers who travel abroad; however, little is known about effective practices from the perspective of partner organizations. This study aims to understand how variables such as the skill-level of volunteers, the duration of service, cultural and language training, and other key variables affect partner organizations’ perceptions of volunteer effectiveness at promoting healthcare and nutrition. Method: This study used a cross-sectional design to survey a convenience sample of 288 volunteer partner organizations located in 68 countries. Principle components analyses and manual coding of cases resulted in a categorization of five generalized types of international volunteering. Differences among these types were compared by the duration of service, kill-level of volunteers, and the volunteers’ perceived fit with organizational needs. In addition, a multivariate ordinary least square regression tested associations between nine different characteristics/activities and the volunteers’ perceived effectiveness at promoting healthcare and nutrition. Results: Partner organizations viewed highly-skilled volunteers serving for a short-term abroad as the most effective at promoting healthcare and nutrition in their organizations, followed by slightly less-skilled long-term volunteers. The greatest amount of variance in perceived effectiveness was volunteers’ ability to speak the local language, followed by their skill level and the duration of service abroad. In addition, volunteer training in community development principles and practices was significantly related to perceived effectiveness. Conclusion: The perceptions of effective healthcare promotion identified by partner organizations suggest that program and volunteer characteristics need to be carefully considered when deciding on methods of volunteer preparation and engagement. By better integrating evidence-based practices into their program models, international volunteer cooperation organizations can greatly strengthen their efforts to promote more effective and valuable healthcare and nutrition interventions in partner communities.
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Digital Collaborative Consumption in an emerging market: South African food delivery services
(University of the Witwatersrand, Johannesburg, 2023) Tinayeshe, Shumba; Saruchera, Fanny
Many consumers have complained about food delivery services. The applications make double payments, and sometimes, the call centres are not easily accessible. Orders get mixed up, and sometimes food is delivered to the wrong addresses. Digital collaborative consumption (DCC) enables consumers to share products and services instead of owning them. A new and rapidly growing class of business models uses digitally mediated platforms to facilitate the DCC of goods and services. Smartphones' development and their rapid spread suggest that these business models could address typical low capital formation and high unemployment in emerging markets (EMs). However, although DCC is integral to daily life in emerging marketplaces, very little is known about DCC business models. The research aimed to evaluate the impact of DCC in the food delivery industry in emerging markets, focusing on South Africa. To achieve this goal, the study specifically aimed at assessing the drivers and deterrents of digital collaborative consumption in the food delivery industry, the impact of the DCC business model and develope a conceptual model which explains and predict consumer attitudes and buying intentions in EMs. Data was collected from 828 participants using validated instruments from South Africa. The theorised relations were assessed simultaneously using structural equation modelling. Models were fit to item covariance matrices using robust maximum likelihood estimation in Mplus, version 7. The research advanced the understanding of DCC to make conceptual, methodological, empirical, and practical contributions. Conceptually, the study included cognitive response and attitudes as potential mediators of DCC drivers in EMs. Empirically, the study brought together variables and relations not previously studied in EMs, including environmental influences and individual differences influencing consumer adoption. Methodologically, a new scale measuring DCC was developed from existing scales, assessed rigorously using confirmatory factor analysis, and showed good measurement properties. Home delivery, economic benefits, social benefits and security assurance strongly influenced the intention to continue using the DCC business model, while trust in the platform showed a non-significant relationship. Practically, the effect size estimates suggested that home delivery, economic benefits, Perceived Usefulness (PU) and Perceived Ease of Use (PEOU) and security assurance have practical relevance for marketing strategies and reshaping public policy in DCC. The study recommends approaches that the research institutes, government, policymakers and business leaders can use to unlock opportunities and get new guidance on this rapidly growing business model in EMs
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Acceptability of the dapivirine vaginal ring for HIV1 prevention among women reporting engagement in transactional sex
(ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD) E N Browne; K Torjesen; B G Mirembe; Thesla Palanee-Philips; N Jeenarain; E et al; Krishnaveni Reddy
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Entanglement beating in free space through spin–orbit coupling
(Springer Nature, 2018) Rosales-Guzmán, Carmelo; Denz, Cornelia; Otte, Eileen; Ndagano, Bienvenu; Forbes, Andrew
It is well known that the entanglement of a quantum state is invariant under local unitary transformations. This rule dictates, for example, that the entanglement of internal degrees of freedom of a photon remains invariant during free-space propagation. Here, we outline a scenario in which this paradigm does not hold. Using local Bell states engineered from classical vector vortex beams with non-separable degrees of freedom, the so-called classically entangled states, we demonstrate that the entanglement evolves during propagation, oscillating between maximally entangled (purely vector) and product states (purely scalar). We outline the spin–orbit interaction behind these novel propagation dynamics and confirm the results experimentally, demonstrating spin–orbit coupling in paraxial beams. This demonstration highlights a hitherto unnoticed property of classical entanglement and simultaneously offers a device for the on-demand delivery of vector states to targets, for example, for dynamic laser materials processing, switchable resolution within stimulated emission depletion (STED) systems, and a tractor beam for entanglement.