4. Electronic Theses and Dissertations (ETDs) - Faculties submissions
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Item Landscape, Rock Art Recording, Narrative: A Biography of The Harald Pager Archive(University of the Witwatersrand, Johannesburg, 2019) Moodley, Lemishka; Wintjes, JustineIn the early days of the discipline of archaeology, the archaeologist Sir Charles Thomas Newton stated, in a lecture at Oxford University in June 1880, that “the subject-matter of Archaeology is threefold – the Oral, the Written and the Monumental” (Newton 1880, p.3–7). By ‘oral’, he meant expressions of spoken language as a form of patterned communication passed down from the past, which he considered to be as significant as written texts and traces of the built environment. Newton’s statement also resonates with ongoing attempts to make sense of the fragmentary remains of the past by including living sources with links to those remains, often referred to as ‘oral traditions’. I argue that the domain of ‘oral’ could be extended in the contemporary context to refer to the realm of the ‘spoken word’. The spoken word is mobilised in the telling of personal histories of researchers engaged in making sense of the past, consistent with a move towards the study of the production of archaeological knowledge, and the broader context of the history of science. The past, and the investigation of that past, can be easily lost or erased with time, unless it is documented in some form. For as long as I can remember, I’ve had a keen interest in knowing about the world that preceded me. So naturally, movies like Raiders of the Lost Ark (1981), The Mummy (1999), Lara Croft: Tomb Raider (2001), 10 000 BC (2008), The Prince of Egypt (1998), Brother Bear (2003) and many others, fascinated and triggered my overactive imagination. These points of inspiration even prompted many crazy shenanigans and adventures that took place in my back yard. Needless to say, my mother was never impressed because her garden was in constant danger of being destroyed through micro-excavations (as I had to find the treasure I buried the previous evening!). However, it was a Pixar animated film — The Croods (2013) — that recently re-ignited my interest in deeper human history. Despite its status as a relatively mainstream commercial animated film, The Croods sparked my curiosity to find ways to visit the past and bring yesterday’s stories into our lives today. After their cave collapses, the first Crood family has to undertake a journey to find a new home. The father, provider and leader of his pack, recounts multiple stories that urge and caution his children to follow the rules described on the cave wall and to not try anything “new”, or generally be curious for that matter. He sees newness as dangerous, with potentially serious repercussions like death. He prefers for them to dwell in the “safe” compounds of the cave in which they live. He develops “cautionary” narratives through visual means by drawing pictures on the cave walls using pigment and dirt he scoops off the ground. The animated film highlights the ways in which a pictorial expression in the form of rock markings could be enlivened in its original context of performance and story-telling, and, also, the ways in which history is forged through personal experience. The film also prompted me to reconsider the academic realm in which rock art is primarily situated in southern Africa, which is archaeology, and the possible perspectives that other disciplines could bring to bear on these materials, such as art history. My understanding of the reasons why rock art (and its copies) can and should also be considered and studied as an art form, ultimately stems from my own experience in art education. The rock art works made by the San people are encoded with “the history and culture of a society” that is “thousands of years old” and “a testament of the displaced ancient African culture and the San presence in the world” (Solomon 2005). By studying these traces as artworks, researchers, historians and archaeologists are reminded to look at the visual features, but also beyond the physical aspects of the work. They begin to consider the processes that contributed to its making, and the various interpretations and meanings that the work had in its context of production, as well as in its subsequent readings. An examination of the process of knowledge production not only draws attention to the development of artmaking and the manner in which different materials were used to create artworks, but also demonstrates the precarious nature of the meaning of rupestrian imagery. An example of this instability of meaning is evidenced by a body of oral histories relevant to the San context, starting with Joseph Orpen’s documentation (1874) of a mountain Bushman called Qing’s account of the meaning behind particular rock art panels. Thereafter, in 1911, Wilhelm Bleek and Lucy Lloyd produced Specimens of Bushmen Folklore, a book of 87 recorded legends, myths and other traditional stories of the |Xam Bushmen in their now-extinct language (Solomon 2005). These resources integrated the “spoken word” with Bushman ethnographic research and laid the foundation for how we read and write about the art today, and they also provide numerous different ways into the question of interpretation. I have utilised my previous first-hand experience as an intern at the Origins Centre, where Simone Opperman and myself worked under the guidance of Steven Sack and Lara Mallen. In working towards the exhibition titled, The Origins of Walter Battiss: “Another Curious Palimpsest”, we worked closely with the Rock Art Research Institute (RARI), and my interest in rock art and its archive grew immensely. Here, I learned of the Harald Pager archive, which is physically located at RARI. After speaking to my supervisor, Dr Justine Wintjes, and listening to the way in which she briefly recounted the story of Harald Pager, who was an active rock art recorder and researcher during the 1960s and 1970s, I wanted to learn more about the man who seemingly died for his craft. Wintjes mentioned that Pager recorded San rock art in the Drakensberg area along with his wife for many years. The Pagers relied heavily on their personal resources in order to keep the recording and documentation process going, and ended up incurring financial debt. Harald Pager was passionate about archaeology and sought to understand the rock paintings he discovered in his travels across the region, which also included what was then South West Africa (now Namibia). In one of the conversations held in the course of my Masters research, Neil Lee explained that Pager dwelled for months on end in a shelter in order to finish the copies of rock paintings he sought to record. Pager’s adamance and determination, and even his belief that he could change his metabolism, apparently led to ill health while recording rock art in the Brandberg in 1985. He died a short time later in Windhoek (Neil Lee 2018, pers. comm.). 7 Given the scale and meticulousness of Pager’s archive, and in light of the conversations I had about him, it seemed strange that his work and story are engaged with so seldom within academia. Nevertheless, Pager’s vast archive lives on in the storerooms of RARI, and now also in the digital world. His recordings were recently digitised during the course of the South African Rock Art Digital Archive (SARADA) project, which sought to scan and make more accessible the content related to southern African rock art at RARI and other institutional and private archives. With the rapid rate at which technology is developing and progressing, physical archives are being turned into digital databases, while also being supplemented by newly created digital materials. However, like all archives, digital archives are not ‘permanent’. They have their own kind of media-specific fragility. The digital archive also has the potential to become obsolete and demonstrates a different kind of limited lifespan. Although digital files are also not physically present in the same way that a physical copy or photograph is, and “lose” a particular kind of materiality and stability, they gain a virtual presence and potentially greater accessibility. As with the ‘original’ archive of rock art that exists in the landscape, the traditional paper archive and the digital archive represent different kinds of longevity and fragility, and have a complex relationship with each other. While being subject to changes and deteriorations of various kinds, the archive is important as a record of archaeological materials in the landscape, but is also a site where knowledge is produced, and the practice of science is conducted. Thus, I set out to devise a project that would address some of these interests and problems, to find connections between the present and the past, and to focus on ‘process’ across the rock art archive in the broad sense of the term. I also wanted my project to address absences and silences within the archive, embedded within the documents and copies as well as the rock art itself. I approached the archive as a layered domain that extends beyond the strictly ‘documentary’ archive, and adopted a ‘personal histories’ approach as a way of forging connections across that archive. I explain this working strategy in more detail in the ‘Methodology’ section below, but first I explore some of the conceptual elements that frame the project.Item Surgical aortopulmonary shunts - a thirty-seven year experience in a South African tertiary institution(University of the Witwatersrand, Johannesburg, 2019-11) Dladla-Mukansi, Nontobeko Charity; Cilliers, Antoinette; Mammen, Vijay; Vanderdonk, KathyIntroduction: The surgical aortopulmonary shunt is a valuable palliative procedure in the management of congenital heart diseases. There is a paucity of data regarding aortopulmonary shunts in the developing world, including South Africa. Objectives: The primary objective was to describe the demographic, clinical and echocardiographic characteristics of children between ages 0 and 14 years that underwent surgical aortopulmonary shunts. The secondary objectives were to describe trends in aortopulmonary shunt designs, outcomes in terms of morbidity and mortality, progression to definitive surgery and to assess patency of shunts. Material and Methods: A retrospective clinical audit of patient files who underwent an aortopulmonary shunt between 01 January 1980 to 30 December 2016 was undertaken at Chris Hani Baragwanath Academic Hospital (CHBAH) in Soweto, Johannesburg. The study period was divided into 3 stages and for descriptive purposes as follows: 1980-1991 refers to period 1, 1992-2003 refers to period 2 and 2004-2016 refers to period 3. Results: A total of 177 aortopulmonary shunts were done over the 37-year study period. Of these 177 patients, 165 (93.2%) patient files were available. Fifty-six percent of the patients included in the study were male. The majority of patients were from the Gauteng Province (76.8%). The four most common diagnoses across the entire study period were tricuspid atresia (26.0%), pulmonary atresia with VSD (23.7%), tetralogy of Fallot (23.2%) and complex cardiac lesions (16.9%), with no particular trend in the proportion of these diagnoses presenting across this study period. There was no statistical difference between period 1 and 2 (p-value a=0,328) and between period 1 and 3 (p-value b=0,548). The total number of all surgeries done over the entire study period was 2145, of which 8.3% were aortopulmonary shunts. Period 1 had the highest percentage [35 (10.9%)] of aortopulmonary shunts compared to the total number of surgeries performed. There was a decline in the number of aortopulmonary shunts performed over the study periods 1-3. With no statistical difference across periods as shown in table 1 with p-value a and b. Of the different types of aortopulmonary shunts, most patients [157 (88.7%)] had a modified Blalock-Taussig shunt (BTS). The remainder of the shunts included 3 (1.7%) classic BTS, 12 (6.8%) central shunts and 5 (2.8%) unknown BTS. The percentage of modified BTS done increased from 80% in period 1 to 87.3% in period 2 and to 95.2% in period 3. Period 1 had the most complications (28.6%) compared to 11.4% in period 2 and 19.1% in period 3. Sepsis as a complication following surgery increased over the study period from 2.9% in period 1 to 3.8% and 7.9% in periods 2 and 3 respectively. Early mortality was 17.1%, 26.6% and 25.4% from periods 1-3 respectively. Late mortality declined from 17.0% in period 1 to 11.4% and 0% in periods 2 and 3 respectively. Only 37 (20.9%) patients were documented to have further surgery after the initial aortopulmonary shunt. Across all three study periods, no blocked shunts were documented. Conclusions: This study describes the characteristics and outcomes of aortopulmonary shunts over a 37-year period in a tertiary care resource limited low to middle income country setting. The commonest cardiac lesions for which aortopulmonary shunts are performed are tricuspid atresia, pulmonary atresia with VSD, tetralogy of Fallot and other complex cyanotic cardiac lesions. The frequency of aortopulmonary shunts compared to total surgeries has corrective surgery for these cardiac lesions. The modified BTS is the most frequently performed aortopulmonary shunt used for palliative surgery in our setting, which is a similar trend in developed countries. The morbidity and mortality in this study is higher than developed countries, with sepsis being the most common complication. Attention to infection control practises need to be emphasized peri- and post-operatively in our hospitals.Item The influence of Entrepreneurial Capital on the performance of subcontracting SMMEs in Gauteng, South Africa(University of the Witwatersrand, Johannesburg, 2019-03) Rampa, Mmatsatsi; Galawe, JabulileThis study explores the prospect of entrepreneurial capital in stimulating SMME performance. It seeks to investigate the use of non-financial capital (entrepreneurial capital) in SMMEs registered under the CIDB, in the general building sector, and its influence on SMME performance. It unpacks the two dimensions of entrepreneurial capital which are entrepreneurial commitment and entrepreneurial competence. This study is a quantitative research, based on a positivism research paradigm. The survey structured research instrument was collected using Qualtrics. The primary data, with a sample size of 377, was distributed using emails and was consolidated via Qualtrics. The data analysis and interpretation was based on descriptive analysis, correlation analysis, exploratory analysis and multiple linear regression analysis. The study was initially designed to analyse the two dimensions (entrepreneurial competence and commitment) collectively with their antecedents (opportunity, relationship, conceptual, organising and strategic competencies); and (normative, continuous and affective commitment) respectively. The survey findings could not converge into a clear multi-dimensional factor structure for each construct. Hence the analysis could only be undertaken at the dimensions level without breaking them down any further into their sub-sets. Entrepreneurial competence was the only one of the two that emerged as the statistically significant predictor of SMME performance. However, both dimensions had a positive influence with business performance, though entrepreneurial commitments’ influence was weak and not statistically significant. SMME owners/managers should continuously advance and assess their specific entrepreneurial competence in order to positively influence their business performance. Policy makers, training and support programmes should align content to specific entrepreneurial competence.Item Men, Masculinity, Aggression and Dominance: An Exploration of How Young Men are Socialized to Deal with Situations of Man-on-Man Aggression and Dominance(University of the Witwatersrand, Johannesburg, 2019) Vilakazi, Zinhle; Davies, NickThere is a considerable body of research placing young South African men at the core of interpersonal violence. Within these studies they are frequently positioned as both perpetrators and victims of extreme and homicidal modes of aggression. In light of this gendered nature of interpersonal violence, this study was directed at exploring how young men’s responses to a situation of man-on-man aggression and dominance might be linked to how society encourages or expects a certain masculine performance from men in such situations. This study’s secondary goal was to offer some ideas about how young men might establish a masculine identity through aggression and dominance. In the pursuing research aims, a total of 14 young adult men attending university participated in this qualitative study. From the analysis what became evident was the continuous pressure that young adult men experience in society, through various social institutions, to somehow fit into dominant or hegemonic constructions of masculinity. Within the context of this study, the proximal cause of aggression and dominance was attributed to broader concerns regarding presentation of a masculine identity, self-worth and social status.Item Investigating 2-hydroxypropyl-β-cyclodextrin (HPβCD) as a novel therapeutic agent for breast cancer(University of the Witwatersrand, Johannesburg, 2019) Saha, Sourav Taru; Kaur, MandeepCancer cells have an increased need for cholesterol, which is required for cell membrane integrity. Cholesterol accumulation has been described in various malignancies including breast cancer. Cholesterol has also been known to be the precursor of estrogen and vitamin D, both of which play a key role in the histology of breast cancer. Elevated cholesterol levels have been linked to breast cancer therefore depleting cholesterol levels in cancer cells can be a viable strategy for treatment. 2-hydroxypropyl-β-cyclodextrin (HPβCD) is a cholesterol depleting compound which is a cyclic amylose oligomer composed of glucose units. It solubilizes cholesterol and is proven to be toxicologically benign in humans. This led us to hypothesise that it might deplete cholesterol from cancer cells and may prove to be a clinically useful compound. Our work provides experimental evidences to support this hypothesis. We identified the potency of HPβCD in vitro against two breast cancer cell lines: MCF7 (Estrogen positive, ER+), MDA-MB-231 [Triple negative breast cancer (TNBC)], and compared the results against two normal cell lines: MRC-5 (Normal Human Lung Fibroblasts) and HEK-293 (Human embryonic kidney) using cytotoxic, apoptosis and cholesterol based assays. HPβCD treatment reduced intracellular cholesterol resulting in significant breast cancer cell growth inhibition through apoptosis. The results hold true for both ER+ and TNBC. We have also tested HPβCD in vivo in MF-1 mice xenograft model and obtained 73.9%, 94% and 100% reduction in tumour size for late, intermediate and early stage TNBC. These data suggest that HPβCD can prevent cholesterol accumulation in breast cancer cells and is a promising anti- cancer agentItem Characterisation of a geothermal resource at Kwako Hills in Zambia using magnetic and natural source audio magnetotelluric methods(University of the Witwatersrand, Johannesburg, 2019) Chinamora, Blessing; Dr Jones, Mike; Prof Webb, SusanThe announcement by the Zambian government that geothermal energy will be recognized as an energy source in the 2013 national budget drew a lot of attention to investors and scientists. Since the 1950s reconnaissance geoscientific surveys have been carried out on geothermal targets in Zambia by the Geological Survey of Zambia (GSZ). The GSZ, together with an Italian company (DAL, SpA), studied various hot springs (Legg, 1974) and as a result, various prospects have been considered for development or exploration. In this research, the Kwako Hills prospect which is located near Mumbwa district, about 150 km northwest of Lusaka, hosts two hot springs which are good surface manifestations for geothermal energy potential was investigated for its geothermal energy reservoir potential using magnetic and natural source audio-magnetotelluric (NSAMT) geophysical methods. The focus of these surveys was on examining the structural controls that govern the occurrence of the hot springs and the outcropping Hook Batholith just to the north of the east-west trending alluvium filled valley. The northern branch of the alluvium valley has a northwest–southeast trend which is the same as the minor fault controlling the two hot springs. These structural controls increase the vertical permeability in the area causing the thermal waters to circulate to depths where they acquire their heat. Permeability is high at intersections of faults and fracture zones, intersection of major and minor faults or intersection of faults and sedimentary aquifers. Major ENE and NE trending faults were mapped along the Mwembeshi Shear Zone and the boundary between the Hook Batholith and the Katanga sediments respectively. The area is underlain by foliated basement granitic gneiss, Hook Batholith granites and Katanga metasediments that are broken into fractures along the foliation trends that control the occurrence and flow of rivers and streams. Overlying the basement rocks are the recent Karoo and Kundelungu sediments which are also permeable along the bedding or cleavage planes. The vegetation pattern, flow and occurrence of rivers or streams reflect trends of zones of weakness in the basement. Fractured zones developed along these foliations and were mapped at outcropping scale using Google Earth, aeromagnetic and ground magnetic data interpretation. Interpretation of aeromagnetic data confirmed the foliation trends that were suggested by Abell (1970) and Naydenov et al. (2014). One dimensional (1D) and two dimensional (2D) magnetotelluric (MT) resistivity models were created on the basis of a 120 MT sounding data set. A dimensionality and distortion analysis of the NSAMT data was carried out based on the approach of Groom and Bailey (1989) and it was concluded that the data were collected almost perpendicular to strike, which is also supported by the geological mapping. MT smooth inversion models showed the lateral and vertical extent of the potential geothermal reservoir. Different 2D MT inversion approaches were applied to investigate the lateral continuity of the conductive sedimentary layer of the Kundelungu unit (slate, siltstone and shale). In order to map the subsurface structure of the area, a magnetic model was then produced using the acquired ground magnetic data and constrained using magnetic susceptibility measurements, MT data and geology mapped on the surface. Magnetic data interpretation confirmed an NW-SE fault controlling the hot springs, which was mapped using the NSAMT inversion results. The research shows that there is a lateral conductive, water saturated zone (reservoir) present between 150 m and 550 m depth and deeply seated faults in the basin. Along the deeply seated faults the conductive zones are vertical and continue with depth. The information shows that the thermal waters of the hot springs appear to circulate to depths more than 2.5 km along deep seated faults and foliation fractures penetrating the foliated rocks of the Hook Batholith and basement rocks. This water is heated by the regional geothermal gradient of 23ºC/km. Further exploration can be carried out on the study area to prove its potential for a geothermal resource.Item Early-stage entrepreneurs’ marketing activity in South Africa(University of the Witwatersrand, Johannesburg, 2019) Botha, Jamie-Lee Ann; Mazonde, NomusaPurpose: This paper explored the unique characteristics of the marketing function of early-stage entrepreneurs operating in South Africa. Methodology/approach: A qualitative study was done. The data was collected by doing unstructured face-to-face interviews to conceptualise the unique marketing activities of early-stage entrepreneurs operating in the South African market. Findings: The study indicated that entrepreneurs do digital marketing; however, the primary marketing activity is the ‘on the ground’ marketing. Entrepreneurs still execute old fashioned, cold calling and relationship building with the customer at the centre of the business. Entrepreneurs boasted of their agility to adopt new technology and offer personalised service and product packages to meet the customer’s needs. Value: This paper uncovered the marketing activities of early-stage entrepreneurs and highlighted the marketing areas that need improvement. The results will assist entrepreneurs in the early business development stages with their marketing endeavours and enhance the business performance. The research contributed to the domain of entrepreneurial marketingItem Shared Mobility and Private Vehicle Ownership: A South African Perspective(University of the Witwatersrand, Johannesburg, 2019) Radebe, Valela Napthtal; Ndaba, ZaneleWhen former and late President Nelson Mandela arrived in Soweto after his release from prison in 1990, he was surprised to see the high number of private vehicles that were there since his imprisonment in the early 1960’s. The improved living standards (in spite of Apartheid) and poor public transport services had led to an increase in private vehicle ownership by Sowetans. Unlike in other more affluent areas, the majority of vehicles leaving Soweto on any given weekday have at least three occupants and some may even be overloaded. Owing to the high cost of owning and maintaining private vehicles, owners thereof have had to organise lift clubs to share costs with commuters for trips of similar origins and destinations. This form of shared mobility has also been very popular in other parts of South Africa. The lack of viable mass-transit public transport services in both poor and affluent areas has placed more reliance on private vehicles. Outdated public transport services in cities like Johannesburg are still clustered around old economic nodes like the Johannesburg Central. Rail lines built in the 1960’s and 1970’s are still based on transporting daily commuters to these central business districts. However, new economic hubs have since mushroomed in commercial districts in the north of Johannesburg in areas like Sandton, Fourways and Rosebank. The relocation in the late 1990’s of the Johannesburg Securities Exchange from Johannesburg Central to Sandton proved to be a catalyst to this business migration. Owing to the inflexibility of traditional public transport, mini-bus taxis have had to fill this void for poorer communitiesItem Entrepreneurial orientation of the City of Johannesburg(University of the Witwatersrand, Johannesburg, 2019) Malakoane, JonesThe notion of entrepreneurial orientation (EO) is important because it contributes to the fundamental apprehension of entrepreneurship. Increasingly, attention is being paid by scholars and policy makers to the concept of entrepreneurial ecosystems (EE) as incubators of innovation, creativity and entrepreneurship. Though the concept is still in its embryonic phase, well performing entrepreneurial ecosystems such as the Silicon Valley in California are the envy of many governments striving for economic success, through promotion of entrepreneurship. The primary objective of this study was to explore the relationship between the perceived entrepreneurial orientation of the City of Johannesburg Department of Economic Development (CoJ-DeD) and the perceived City of Johannesburg’s (CoJ) local EE performance. EO of an organisation, for the purpose of this study, is reflected in the organisation’s innovativeness, proactiveness and risk-taking abilities while EE was measured by the three variables, opportunity exploitation (OE), opportunity recognition (OR) and entrepreneurial activity (EA). The data relating to the perceived city’s EE performance was from 109 usable questionnaires collected from a target sample size of 150, the sample’s population was comprised of nascent entrepreneurs, early start-up and established business owners in the CoJ. The data concerning perceived EO of CoJ-DeD officials was from 46 usable questionnaires, this sample was collected from a population of 50 CoJ-DeD officials, comprised of middle and senior managers. The measuring instruments construct validity was evaluated by means of Cronbach alpha coefficients and principal component exploratory factor analysis. The Welch’s t-test was utilized to assess the study’s conceptual framework model. The results showed that EO of the CoJ-DeD officials is defined by proactiveness, innovativeness and risk-taking and the city’s local EE perceived performance is defined only by opportunity exploitation and opportunity recognition. The results also showed a positive relationship between innovation and opportunity recognition, proactiveness and opportunity recognition and between risk-taking and opportunity recognition. It is vi recommended that entrepreneurship becomes the dominant strategic thinking in the CoJ to help unlock opportunities and new sources of value, services and innovation.Item Identifying obstacles to the growth of new SMEs: A Factor Analysis Approach(Identifying obstacles to the growth of new SMEs: A Factor Analysis Approach, 2019) Mphahlele, Dorothy B.; Merino, AndresIt is widely acknowledged that Small and Medium-Sized Enterprises (SMEs) are key drivers of economic growth and job creation in developing countries. It has also been established that new SMEs face common problems that arise as they grow and develop. These challenges stem from internal as well as external factors that can have an adverse impact on their survival and growth. The objective of this study was to identify the internal and external obstacles to the growth of SMEs. A questionnaire was used to collect data on factors affecting the growth of SMEs. The results of the questionnaire were analysed using Factor Analysis. Eight different factors were identified. These factors were further analysed to determine their impact on SMEs. The ranking of the factors in order of importance was as follows: lack of access to finance, overregulation, the economic environment, high competition, lack of internal resources, high input costs, lack of experience of the entrepreneur and poor service delivery. The report examines possible ways of mitigating the adverse factors identified and makes a series of recommendations to increase the likelihood of the survival of SMEs in the South African context.