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Now showing 1 - 5 of 19

Recent Submissions

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The dynamics of place branding in Johannesburg: 1994 - 2019
(University of the Witwatersrand, Johannesburg, 2023-11) Mbinza, Zenzile; Sihlongonyane, Mfaniseni Fana
This PhD thesis lays the ground for understanding place branding processes from cities of the Global South. It critically explores place branding as an emerging mechanism for urban governance in Johannesburg. It is critical because place branding and its related processes have increasingly gained momentum in countries, regions and cities jostling for niche status in global economics. This thesis explores the different place brands that Johannesburg coined over time, focussing on the period between 1994 and 2019. It explored the city’s place brands under the five mayors that presided over Johannesburg, beginning with Dan Pretorius (1994 – 1995), Isaac Mogase (1995 – 1999), Amos Masondo (2000 – 2011), Parks Tau (2011 – 2016) and Herman Mashaba (2016 – 2019). The thesis employed a qualitative research methodology and case study design. Primary data Archival research and interviews were the primary data collection strategies. The ensuing discussion of place brands in Johannesburg reveals the dynamics and push factors that have contributed to the development of place brands under the time in question. Politics, economics, and activities related to globalisation emerged as leading drivers for the city of Johannesburg to develop its various place brands. The thesis found that Johannesburg followed a template similar to the cities of the Global North in its application of place branding. However, the thesis also found gaps in the city’s place branding processes. For example, there was limited engagement with the city residents when developing Johannesburg’s place brands. It pointed to a unilateral, top-down application of place branding in the city, which precluded it from using these processes as democracy-building tools. It necessitates the exploration of place branding from the perspective of city governments to begin encompassing issues of inclusivity and public participation. In this light, the thesis calls for a more strategic application of place branding in the Johannesburg.
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Going entrepreneurial the dark side of donors and trade union support to informal workers in Accra Ghana
(ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD) P Asafu-Adjaye; Matteo Rizzo
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Energy storage properties of carbon onion-carbon nanofibre composites containing transition metal compounds
(University of the Witwatersrand, Johannesburg, 2022) Khawula, Tobile Nokuphiwa Yollanda; Ozoemena, K. I.
The quest for electrical energy storage has been a key driver for researchers to come up with more effective means of storing this form of energy due to the intermittent nature of renewable energy sources. Several countries have swiftly adopted the transformative potential of renewables, in particular solar energy, while others have delayed the implementation due to complex policies surrounding renewable energy projects. A way forward would be innovative regulatory approaches that encourage the pairing of solar systems with other generation technologies, and with storage, to offer a “round the clock” supply. Rechargeable batteries and supercapacitors are widely employed energy storage systems. A rechargeable battery system offers high energy density, with lithium-ion batteries (LIBs) being the most widely used. For some applications, it is imperative that energy is delivered at a much faster rate. This characteristic feature is known as power density, and supercapacitors have proven to be much better than batteries in this case. The large-scale commercialization and adoption of a supercapacitor are hindered by its low energy density. The electrode material is a major determinant of the success of supercapacitors. Generally, these are supported on high surface area carbon materials. This study focused on the development of electrospun polyacrylonitrile (PAN) fibres embedded with onion- like carbon (OLC) and iron (II) phthalocyanine (FePc) particles, and encapsulation of the fibres with Molybdenum disulphide (MoS2). Furthermore, composite fibres were either integrated with manganese (III) oxide (Mn2O3) or engineered with defects for enhanced performance in symmetric supercapacitors. The synthesis of electrode materials was divided into four phases; In the first phase (1), OLC nanoparticles were embedded in electrospun PAN fibres and decorated with the Mn2O3 and evaluated as supercapacitor electrode materials. For enhanced interfacial electrochemistry and overall capacitance, the electrode material in (1) was encapsulated with MoS2 in phase (2). In phase (3) FePc embedded in the PAN electrospun fibres were evaluated for supercapacitor applications. Limited specific capacitance and poor cycling stability were observed, thus suggesting integrating OLC and further encapsulation with MoS2, in phase (4). The morphology of the fibres was vii engineered with defects in the form of Fe2+ vacancies to maximize the electrochemical reactions of the OLC/MoS2 fibre composite. The electrochemical properties of the fibre composite materials were investigated and OLC/Mn2O3-CNF exhibited a specific capacitance, energy and power density of electrodes were 200 F g-1, 44.63 Wh kg-1 and 3 235 W kg-1, respectively with excellent capacitance retention. While the MoS2 encapsulated and Mn2O3 decorated fibre composite, OLC/MoS2@Mn2O3 displayed a specific capacitance, energy and power density of 348 Fg-1 18.42 Wh kg-1 and 5 095 W kg-1, respectively. It is pertinent to note that the capacitance of the electrodes was retained throughout the 5 000 cycles of the charge-discharge test. Upon thermal treatment at 600 °C, FePc-PAN transformed into FeN4-CMF and exhibited a specific capacitance, energy and power density of 147 F g-1, 12.48 Wh kg-1 and 4 320 W kg-1, respectively. The vacancy-rich (FeN4)d-OLC- CNF@MoS2 composite obtained by the removal of Fe2+ atoms, showed a specific capacitance, energy density and power density of 481 F g-1, 76 Wh kg-1 5833 W kg-1, respectively. This study underscores strategic processes that can be adapted in the design, synthesis and optimization of supercapacitors-based electrodes for enhanced performance.
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Attitude and acceptance of Artificial Intelligence technologies in the South African financial services. industry
(University of the Witwatersrand, Johannesburg, 2024) Wotela, Ruth Rumbidzai; Maier, Christoph
Despite Artificial Intelligence (AI) being topical, the successful adoption of AI technologies within organisations has been slower than expected. Literature and past research highlights the mixed and contradictory views and findings regarding employees’ attitude and acceptance of AI technologies, which challenge the successful implementation and use of AI technologies. Further, research on employees’ attitude and acceptance of AI technologies in emerging market economies, such as South Africa, and specifically within mandatory settings is limited. The purpose of this research was to investigate and determine factors influencing employees’ attitude and acceptance of AI technologies amongst employees within the financial services industry, where the use of AI technologies is mandatory. The Technology Acceptance Model (TAM) and the Technology-Organisation-Environment (TOE) framework were integrated and extended. This quantitative research study used a cross-sectional design. An online survey was distributed to employees within financial services organisations. A total of 410 valid responses were analysed using descriptive statistics, correlation analysis and regression analysis. Textual responses from the open-ended questions were categorised and presented visually in the form of word clouds. The research results indicate that each of the technological, individual, organisational, and environmental factors have a significant positive effect on attitude towards use of AI technologies. Multiple regression and stepwise regression analysis were used to identify the most influential determinants of attitude towards use of AI technologies from all the technological, individual, organisational and environmental factors. The results indicate that employee wellbeing, competitive pressure, perceived usefulness, management support, perceived ease of use, organisational justice and customer pressure are key determinants of attitude towards the use of AI technologies. The attitude-acceptance relationship is confirmed, as attitude towards use of AI technologies positively influences the acceptance of AI technologies. Although employees’ job roles do not moderate the relationship between attitude and acceptance of AI technologies, their experience with using AI technologies does. Based on these findings the ITOE model for implementing AI technologies is developed, and can be used to facilitate the successful implementation and use of AI technologies. The implications of this research, as well as recommendations for organisations and future research are also discussed.