Engaging within zones of proximal development on Facebook : the case of using Facebook to support learning and mentoring on a NQF Level 5 environmental education, training and development practices learnership
- Authors: Chetty, Preven
- Date: 2015
- Subjects: Social media -- Study and teaching (Higher) -- South Africa , Internet in education , Online social networks , Organizational learning , Employees -- Training of , Group work in education
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2024 , http://hdl.handle.net/10962/d1017335
- Description: This study focuses on two roll-outs of a, year-long National Qualification Framework (NQF) level 5, environmental education learnership in South Africa and attempts at enhancing collaborative learning at workplaces using a familiar social networking site called Facebook. This study uses the Facebook group sites created for the workplace course component of the course as one of the means of data collection. Additional interviews and focus groups with learners and administrators on both Environmental Education Training and Development Practices (EETDP) courses also informed the study. The study is located within the context of the rise of the information age, its effects on socio-ecological landscape at large and ways of using social networking sites in order to facilitate scaffolding and meaning making within zones of proximal development for environmental education learnerships. It also looks at the model of apprenticeship and workplace based learning as it is broadly located at the nexus of the SAQA-led academic inquiry into workplace based learning and professional development. It was found that the use of Facebook on the EETDP learnership allowed for collaborative learning to take place between peer to peer interactions as well as between tutors and learners. It was also noted that scaffolding processes requires both technical assistance and strong instructional input from course tutors. One of the most important findings in terms of collaborative learning and engaging within the Zone of Proximal Development (ZPD) was that learners were able to communicate more effectively and freely with both fellow learners and tutors on course after participating on the Facebook group sites. The study offers recommendations on how a social networking platform like Facebook can be utilised effectively for environmental education. The study recommends that scaffolding of workplace based tasks and concepts needs to be better integrated with the course and in both online and offline interactions between learners. It also illustrates how social networking sites can become powerful tools for creating meaning making when combined with course work.
- Full Text:
- Date Issued: 2015
- Authors: Chetty, Preven
- Date: 2015
- Subjects: Social media -- Study and teaching (Higher) -- South Africa , Internet in education , Online social networks , Organizational learning , Employees -- Training of , Group work in education
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2024 , http://hdl.handle.net/10962/d1017335
- Description: This study focuses on two roll-outs of a, year-long National Qualification Framework (NQF) level 5, environmental education learnership in South Africa and attempts at enhancing collaborative learning at workplaces using a familiar social networking site called Facebook. This study uses the Facebook group sites created for the workplace course component of the course as one of the means of data collection. Additional interviews and focus groups with learners and administrators on both Environmental Education Training and Development Practices (EETDP) courses also informed the study. The study is located within the context of the rise of the information age, its effects on socio-ecological landscape at large and ways of using social networking sites in order to facilitate scaffolding and meaning making within zones of proximal development for environmental education learnerships. It also looks at the model of apprenticeship and workplace based learning as it is broadly located at the nexus of the SAQA-led academic inquiry into workplace based learning and professional development. It was found that the use of Facebook on the EETDP learnership allowed for collaborative learning to take place between peer to peer interactions as well as between tutors and learners. It was also noted that scaffolding processes requires both technical assistance and strong instructional input from course tutors. One of the most important findings in terms of collaborative learning and engaging within the Zone of Proximal Development (ZPD) was that learners were able to communicate more effectively and freely with both fellow learners and tutors on course after participating on the Facebook group sites. The study offers recommendations on how a social networking platform like Facebook can be utilised effectively for environmental education. The study recommends that scaffolding of workplace based tasks and concepts needs to be better integrated with the course and in both online and offline interactions between learners. It also illustrates how social networking sites can become powerful tools for creating meaning making when combined with course work.
- Full Text:
- Date Issued: 2015
An empirical study on staff turnover and retention within Eskom : Eastern Cape Operating Unit
- Authors: Chibba, Rajesh Chagan
- Date: 2015
- Subjects: Eskom (Firm) , Labor turnover -- South Africa -- Eastern Cape , Employee retention -- South Africa -- Eastern Cape , Job satisfaction -- South Africa -- Eastern Cape , Career development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:847 , http://hdl.handle.net/10962/d1017514
- Description: This research paper is broken up into three sections, namely an evaluation report, a literature review and a description of the research methodology. The evaluation report section is an assessment of the factors that could contribute to staff leaving the organisation and why staff would choose to remain with the organisation. The Distribution Division of Eskom is divided into nine separate Operating Units (OU's), in line with the nine Provinces. According to an Eskom Human Resource Manager (Mjali, 2013), as at March 2012 there were 2231 employees in the Easter Cape Operating Unit, while the staff turnover for the same period was 4.53%. Of the 101 staff that had resigned for the period 01 April 2011 to 31 March 2012, there were 27 transfers, 26 resignations and 30 retirements. The balance of 18 staff that left was due to dismissals and deaths. While the statistics suggest a healthy level of staff turnover at present, given the current pressures that Eskom employees are under, it is important to investigate their future intentions and to see what Eskom can do to continue to retain their services. The literature relating to staff turnover and retention was examined to determine the meaning of the terms retention and turnover and to review the relevant turnover topics that were emerging from the exit interview data. The research conducted was quantitative in nature, and a questionnaire was distributed to all managerial staff within the Eastern Cape Operating Unit of Eskom. The questionnaire was sent electronically to the participants via email with the link to the questionnaire. Participants were requested to respond on questions relating to factors on turnover and retention, and the responses were used to assess employee's intention to either remain with the organisation or to leave. The feedback received was analysed with the use of data analysis in Microsoft Excel (2010). The results of the research showed that there were two distinct themes related to employees' intention to remain with the organisation, namely job satisfaction and career development. On the other end of the scale, themes which would cause staff to want to leave the organisation were the performance management system of the organisation, not being listened to (i.e. to the ideas and views of staff) and leadership (i.e. the way the organisation was being led). Recommendations are made to management. The study also recommends future research that can be done to get greater insight into factors relating to staff turnover and retention. A detailed review of the literature is included in Section two of the report. Only essential components of the literature are included in Section one of report. Section three of the report provided a detailed description of the research design and the research procedure that was followed.
- Full Text:
- Date Issued: 2015
- Authors: Chibba, Rajesh Chagan
- Date: 2015
- Subjects: Eskom (Firm) , Labor turnover -- South Africa -- Eastern Cape , Employee retention -- South Africa -- Eastern Cape , Job satisfaction -- South Africa -- Eastern Cape , Career development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:847 , http://hdl.handle.net/10962/d1017514
- Description: This research paper is broken up into three sections, namely an evaluation report, a literature review and a description of the research methodology. The evaluation report section is an assessment of the factors that could contribute to staff leaving the organisation and why staff would choose to remain with the organisation. The Distribution Division of Eskom is divided into nine separate Operating Units (OU's), in line with the nine Provinces. According to an Eskom Human Resource Manager (Mjali, 2013), as at March 2012 there were 2231 employees in the Easter Cape Operating Unit, while the staff turnover for the same period was 4.53%. Of the 101 staff that had resigned for the period 01 April 2011 to 31 March 2012, there were 27 transfers, 26 resignations and 30 retirements. The balance of 18 staff that left was due to dismissals and deaths. While the statistics suggest a healthy level of staff turnover at present, given the current pressures that Eskom employees are under, it is important to investigate their future intentions and to see what Eskom can do to continue to retain their services. The literature relating to staff turnover and retention was examined to determine the meaning of the terms retention and turnover and to review the relevant turnover topics that were emerging from the exit interview data. The research conducted was quantitative in nature, and a questionnaire was distributed to all managerial staff within the Eastern Cape Operating Unit of Eskom. The questionnaire was sent electronically to the participants via email with the link to the questionnaire. Participants were requested to respond on questions relating to factors on turnover and retention, and the responses were used to assess employee's intention to either remain with the organisation or to leave. The feedback received was analysed with the use of data analysis in Microsoft Excel (2010). The results of the research showed that there were two distinct themes related to employees' intention to remain with the organisation, namely job satisfaction and career development. On the other end of the scale, themes which would cause staff to want to leave the organisation were the performance management system of the organisation, not being listened to (i.e. to the ideas and views of staff) and leadership (i.e. the way the organisation was being led). Recommendations are made to management. The study also recommends future research that can be done to get greater insight into factors relating to staff turnover and retention. A detailed review of the literature is included in Section two of the report. Only essential components of the literature are included in Section one of report. Section three of the report provided a detailed description of the research design and the research procedure that was followed.
- Full Text:
- Date Issued: 2015
The regulation of agricultural subsidies in the World Trade Organization framework : a developing country perspective
- Authors: Chigavazira, Farai
- Date: 2015
- Subjects: Foreign trade regulation -- Developing countries Agricultural laws and legislation -- Developing countries Tariff on farm produce -- Developing countries
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10353/1874 , vital:27569
- Description: The Agreement on Agriculture (AoA) was adopted to eliminate the illegitimate use of tradedistorting agricultural subsidies and thereby reduce and avoid the negative effects subsidies have on global agricultural trade. However, the AoA has been fashioned in a way that is enabling developed countries to continue high levels of protectionism through subsidization, whilst many developing countries are facing severe and often damaging competition from imports artificially cheapened through subsidies. The regulation of subsidies in the World Trade Organisation (WTO) has been a highly sensitive issue. This is mainly due to the fear of compromising food security especially by developed countries. Developing countries have suffered negatively from the subsidy programmes of developed countries who continue to subsidize their agricultural sector. This position of the developing countries in the global trade system which has been described as weak, has drawn criticism that the WTO as it currently operates does not protect the interests of the weak developing nations, but rather strengthens the interests of the strong developed nations. The green box provisions which are specifically designed to regulate payments that are considered trade neutral or minimally trade distorting has grossly been manipulated by developed countries at the mercy of the AoA. Developed countries continue to provide trade distorting subsidies under the guise of green box support. This is defeating the aims and objectives of the AoA. The study examines the regulation of WTO agricultural subsidies from the developing countries’ belvedere. It looks at the problems WTO member states face with trade distorting subsidies, but focuses more on the impact these have on developing states. It scrutinizes the AoA’s provisions regulating subsidies with a view to identify any loopholes or shortcomings which undermine the interests and aspirations of developing countries. This is behind the background that some of the provisions of the AoA are lenient towards the needs of developed countries at the expense of developing countries.
- Full Text:
- Date Issued: 2015
- Authors: Chigavazira, Farai
- Date: 2015
- Subjects: Foreign trade regulation -- Developing countries Agricultural laws and legislation -- Developing countries Tariff on farm produce -- Developing countries
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10353/1874 , vital:27569
- Description: The Agreement on Agriculture (AoA) was adopted to eliminate the illegitimate use of tradedistorting agricultural subsidies and thereby reduce and avoid the negative effects subsidies have on global agricultural trade. However, the AoA has been fashioned in a way that is enabling developed countries to continue high levels of protectionism through subsidization, whilst many developing countries are facing severe and often damaging competition from imports artificially cheapened through subsidies. The regulation of subsidies in the World Trade Organisation (WTO) has been a highly sensitive issue. This is mainly due to the fear of compromising food security especially by developed countries. Developing countries have suffered negatively from the subsidy programmes of developed countries who continue to subsidize their agricultural sector. This position of the developing countries in the global trade system which has been described as weak, has drawn criticism that the WTO as it currently operates does not protect the interests of the weak developing nations, but rather strengthens the interests of the strong developed nations. The green box provisions which are specifically designed to regulate payments that are considered trade neutral or minimally trade distorting has grossly been manipulated by developed countries at the mercy of the AoA. Developed countries continue to provide trade distorting subsidies under the guise of green box support. This is defeating the aims and objectives of the AoA. The study examines the regulation of WTO agricultural subsidies from the developing countries’ belvedere. It looks at the problems WTO member states face with trade distorting subsidies, but focuses more on the impact these have on developing states. It scrutinizes the AoA’s provisions regulating subsidies with a view to identify any loopholes or shortcomings which undermine the interests and aspirations of developing countries. This is behind the background that some of the provisions of the AoA are lenient towards the needs of developed countries at the expense of developing countries.
- Full Text:
- Date Issued: 2015
Understanding the poverty-reducing livelihoods of child support grant caregivers in Riebeeck East, South Africa
- Authors: Chikukwa, Vimbainashe
- Date: 2015
- Subjects: Archer, Margaret Scotford -- Political and social views , Child caregivers -- South Africa -- Riebeek-Oos , Public welfare -- South Africa -- Riebeek-Oos , Grants-in-aid -- South Africa -- Riebeek-Oos , Poverty -- South Africa -- Riebeek-Oos , Critical realism , South Africa -- Social conditions -- 1994- , South Africa -- Economic conditions -- 1991-
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3393 , http://hdl.handle.net/10962/d1018196
- Description: In 1994, racial domination in the form of apartheid ended in South Africa and the first postapartheid government was elected through a non-racial and democratic franchise. The new government inherited an entrenched system of racial inequality as well as widespread poverty amongst the formerly oppressed population, and it sought to address these challenges through policies of redistribution based on a new progressive constitution which emphasised the realisation of socio-economic rights. At the same time, and despite its redistributive measures, the post-apartheid government has pursued a macro-economic strategy with pronounced neoliberal dimensions. One of its critical redistributive measures focuses on social assistance to poor blacks, and this has entailed the construction and expansion of a massive social grant system including the child support grant which is received by millions of black South Africans on a monthly basis. The objective of this thesis is to examine and understand the livelihoods of child support grant recipients (or caregivers) in the context of conditions of extreme vulnerability marked by poverty. It does so by focusing on the small town of Riebeek East located in the Eastern Cape Province of South Africa. Though undoubtedly child support grant caregivers are victims of poverty, the thesis demonstrates that they are not without agency. They exist in structural conditions of vulnerability and poverty, but they nevertheless seek to manoeuvre and negotiate their way in and through their conditions of existence. This does not necessarily alleviate their poverty in any significant manner but it does show evidence of reflexivity, decision-making and responsibility in the pursuit of livelihood practices and outcomes. In making this argument, I draw upon the mega-theory of Margaret Archer (specifically, her morphogenetic approach) and the more middle-level perspective of the Sustainable Livelihoods Framework. Beyond contributing to the prevailing academic literature on the child support grant in South Africa, this thesis also hopefully makes a small contribution to controversies about structure and agency within sociology.
- Full Text:
- Date Issued: 2015
- Authors: Chikukwa, Vimbainashe
- Date: 2015
- Subjects: Archer, Margaret Scotford -- Political and social views , Child caregivers -- South Africa -- Riebeek-Oos , Public welfare -- South Africa -- Riebeek-Oos , Grants-in-aid -- South Africa -- Riebeek-Oos , Poverty -- South Africa -- Riebeek-Oos , Critical realism , South Africa -- Social conditions -- 1994- , South Africa -- Economic conditions -- 1991-
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3393 , http://hdl.handle.net/10962/d1018196
- Description: In 1994, racial domination in the form of apartheid ended in South Africa and the first postapartheid government was elected through a non-racial and democratic franchise. The new government inherited an entrenched system of racial inequality as well as widespread poverty amongst the formerly oppressed population, and it sought to address these challenges through policies of redistribution based on a new progressive constitution which emphasised the realisation of socio-economic rights. At the same time, and despite its redistributive measures, the post-apartheid government has pursued a macro-economic strategy with pronounced neoliberal dimensions. One of its critical redistributive measures focuses on social assistance to poor blacks, and this has entailed the construction and expansion of a massive social grant system including the child support grant which is received by millions of black South Africans on a monthly basis. The objective of this thesis is to examine and understand the livelihoods of child support grant recipients (or caregivers) in the context of conditions of extreme vulnerability marked by poverty. It does so by focusing on the small town of Riebeek East located in the Eastern Cape Province of South Africa. Though undoubtedly child support grant caregivers are victims of poverty, the thesis demonstrates that they are not without agency. They exist in structural conditions of vulnerability and poverty, but they nevertheless seek to manoeuvre and negotiate their way in and through their conditions of existence. This does not necessarily alleviate their poverty in any significant manner but it does show evidence of reflexivity, decision-making and responsibility in the pursuit of livelihood practices and outcomes. In making this argument, I draw upon the mega-theory of Margaret Archer (specifically, her morphogenetic approach) and the more middle-level perspective of the Sustainable Livelihoods Framework. Beyond contributing to the prevailing academic literature on the child support grant in South Africa, this thesis also hopefully makes a small contribution to controversies about structure and agency within sociology.
- Full Text:
- Date Issued: 2015
The design of a new opera house for central, Port Elizabeth
- Authors: Chilton, Marc John
- Date: 2015
- Subjects: Theaters -- South Africa -- Port Elizabeth -- Designs and plans Centers for the performing arts -- South Africa -- Port Elizabeth , Theater architecture -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/15356 , vital:28224
- Description: Urban decentralization and inner city decay is a ubiquitous phenomenon of social and economic circumstance. The rise of sub-urban sprawl around new centres has encouraged urban degeneration and produced unsustainable cities, particularly in South Africa. Consequently, the loss of cultural assets in decaying historic centres, specifi cally in Port Elizabeth, reveals issues pertinent to loss of place and heritage. In combatting urban degeneration, the utilization of culture and the arts has proven to be a powerful rejuvenation strategy. The vision of the Mandela Bay Development Agency, and similar successful global precedents, suggest that a cultural precinct could effectively tackle urban decay in the historic core. This premise guides the proposal.The principal aim of this treatise is the design of a new Opera House acting as a catalyst for the proposed cultural district, based on the inner-city rejuvenation of Central. This aim is achieved by several objectives, which are explored in an effort to unveil potential and appropriate design responses: An investigation of the Opera House typology, which uncovers its dignity, vitality and signifi cance within past and present cities; An exploration of context, which reveals the opportunities to transform identity and urban cultural practise; Research into technical, spatial and physical demands of the program provide depth and root the design responses in reality. As a result, the Opera House sits as a gateway building into the precinct, as well as a cultural and physical landmark within the city. A duality of expression presents both a contrast and self-similarity in the historic context, simultaneously rooting the building in place while conveying a unique character.
- Full Text:
- Date Issued: 2015
- Authors: Chilton, Marc John
- Date: 2015
- Subjects: Theaters -- South Africa -- Port Elizabeth -- Designs and plans Centers for the performing arts -- South Africa -- Port Elizabeth , Theater architecture -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/15356 , vital:28224
- Description: Urban decentralization and inner city decay is a ubiquitous phenomenon of social and economic circumstance. The rise of sub-urban sprawl around new centres has encouraged urban degeneration and produced unsustainable cities, particularly in South Africa. Consequently, the loss of cultural assets in decaying historic centres, specifi cally in Port Elizabeth, reveals issues pertinent to loss of place and heritage. In combatting urban degeneration, the utilization of culture and the arts has proven to be a powerful rejuvenation strategy. The vision of the Mandela Bay Development Agency, and similar successful global precedents, suggest that a cultural precinct could effectively tackle urban decay in the historic core. This premise guides the proposal.The principal aim of this treatise is the design of a new Opera House acting as a catalyst for the proposed cultural district, based on the inner-city rejuvenation of Central. This aim is achieved by several objectives, which are explored in an effort to unveil potential and appropriate design responses: An investigation of the Opera House typology, which uncovers its dignity, vitality and signifi cance within past and present cities; An exploration of context, which reveals the opportunities to transform identity and urban cultural practise; Research into technical, spatial and physical demands of the program provide depth and root the design responses in reality. As a result, the Opera House sits as a gateway building into the precinct, as well as a cultural and physical landmark within the city. A duality of expression presents both a contrast and self-similarity in the historic context, simultaneously rooting the building in place while conveying a unique character.
- Full Text:
- Date Issued: 2015
Ni(II) and Pb(II) dithiocarbamate complexes as precursors for the synthesis of HDA-capped NiS and PbS nanoparticles
- Authors: Chintso, Thobani
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc (Chemistry)
- Identifier: vital:11349 , http://hdl.handle.net/10353/d1020201
- Description: Ni(II) and Pb(II) dithiocarbamate complexes were synthesized and characterized by elemental analysis, UV-Vis, FTIR and TGA and some of the Ni(II) complexes and one Pb(II) were further analyzed by 1H-NMR and 13C-NMR spectroscopy. Generally all the dithiocarbamate ligands are soluble in water while the complexes were soluble mostly in solvents such as chloroform, toluene, DMSO and DCM. Based on the elemental analysis, the dithiocarbamate complexes are formulated as four coordinate (tetrahedral or square planar) compounds. However, the FTIR showed that each of the dithiocarbamate ligands acted as bidentate ligand through two sulfur atoms. The TGA of the most complexes showed one major decomposition step to give respective metal sulfide above 200 oC. In this research project, dithiocarbamate complexes were used as single source precursor for the synthesis of metal sulfide nanoparticles. We studied the optical and structural properties of metal sulfide nanoparticles using UV-Vis, photoluminescence (PL), powder X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The absorption spectra of the metal sulfide nanoparticles are blue shifted in respect to bulk material and they also showed broad emission. The XRD of the NiS nanoparticles were indexed to the cubic and rhombohedral phase, with crystallite sizes of 15 - 18 nm. The XRD of PbS nanoparticles were indexed to the face centered cubic and cubic rock salts, with the crystallite sizes 12 - 18 nm. The TEM images of the metal sulfide nanoparticles showed particles with spherical and rectangular shapes with crystallite sizes 4 - 35 nm.
- Full Text:
- Date Issued: 2015
- Authors: Chintso, Thobani
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc (Chemistry)
- Identifier: vital:11349 , http://hdl.handle.net/10353/d1020201
- Description: Ni(II) and Pb(II) dithiocarbamate complexes were synthesized and characterized by elemental analysis, UV-Vis, FTIR and TGA and some of the Ni(II) complexes and one Pb(II) were further analyzed by 1H-NMR and 13C-NMR spectroscopy. Generally all the dithiocarbamate ligands are soluble in water while the complexes were soluble mostly in solvents such as chloroform, toluene, DMSO and DCM. Based on the elemental analysis, the dithiocarbamate complexes are formulated as four coordinate (tetrahedral or square planar) compounds. However, the FTIR showed that each of the dithiocarbamate ligands acted as bidentate ligand through two sulfur atoms. The TGA of the most complexes showed one major decomposition step to give respective metal sulfide above 200 oC. In this research project, dithiocarbamate complexes were used as single source precursor for the synthesis of metal sulfide nanoparticles. We studied the optical and structural properties of metal sulfide nanoparticles using UV-Vis, photoluminescence (PL), powder X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The absorption spectra of the metal sulfide nanoparticles are blue shifted in respect to bulk material and they also showed broad emission. The XRD of the NiS nanoparticles were indexed to the cubic and rhombohedral phase, with crystallite sizes of 15 - 18 nm. The XRD of PbS nanoparticles were indexed to the face centered cubic and cubic rock salts, with the crystallite sizes 12 - 18 nm. The TEM images of the metal sulfide nanoparticles showed particles with spherical and rectangular shapes with crystallite sizes 4 - 35 nm.
- Full Text:
- Date Issued: 2015
Eliciting and combining expert opinion : an overview and comparison of methods
- Authors: Chinyamakobvu, Mutsa Carole
- Date: 2015
- Subjects: Decision making -- Statistical methods , Expertise , Bayesian statistical decision theory , Statistical decision , Delphi method , Paired comparisons (Statistics)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5579 , http://hdl.handle.net/10962/d1017827
- Description: Decision makers have long relied on experts to inform their decision making. Expert judgment analysis is a way to elicit and combine the opinions of a group of experts to facilitate decision making. The use of expert judgment is most appropriate when there is a lack of data for obtaining reasonable statistical results. The experts are asked for advice by one or more decision makers who face a specific real decision problem. The decision makers are outside the group of experts and are jointly responsible and accountable for the decision and committed to finding solutions that everyone can live with. The emphasis is on the decision makers learning from the experts. The focus of this thesis is an overview and comparison of the various elicitation and combination methods available. These include the traditional committee method, the Delphi method, the paired comparisons method, the negative exponential model, Cooke’s classical model, the histogram technique, using the Dirichlet distribution in the case of a set of uncertain proportions which must sum to one, and the employment of overfitting. The supra Bayes approach, the determination of weights for the experts, and combining the opinions of experts where each opinion is associated with a confidence level that represents the expert’s conviction of his own judgment are also considered.
- Full Text:
- Date Issued: 2015
- Authors: Chinyamakobvu, Mutsa Carole
- Date: 2015
- Subjects: Decision making -- Statistical methods , Expertise , Bayesian statistical decision theory , Statistical decision , Delphi method , Paired comparisons (Statistics)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5579 , http://hdl.handle.net/10962/d1017827
- Description: Decision makers have long relied on experts to inform their decision making. Expert judgment analysis is a way to elicit and combine the opinions of a group of experts to facilitate decision making. The use of expert judgment is most appropriate when there is a lack of data for obtaining reasonable statistical results. The experts are asked for advice by one or more decision makers who face a specific real decision problem. The decision makers are outside the group of experts and are jointly responsible and accountable for the decision and committed to finding solutions that everyone can live with. The emphasis is on the decision makers learning from the experts. The focus of this thesis is an overview and comparison of the various elicitation and combination methods available. These include the traditional committee method, the Delphi method, the paired comparisons method, the negative exponential model, Cooke’s classical model, the histogram technique, using the Dirichlet distribution in the case of a set of uncertain proportions which must sum to one, and the employment of overfitting. The supra Bayes approach, the determination of weights for the experts, and combining the opinions of experts where each opinion is associated with a confidence level that represents the expert’s conviction of his own judgment are also considered.
- Full Text:
- Date Issued: 2015
Towards a changing context and performance practice of mbira dzavadzimu music in Zimbabwe
- Authors: Chipendo, Claudio
- Date: 2015
- Subjects: Mbira music -- Zimbabwe Shona (African people) -- Music
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/6357 , vital:29588
- Description: Mbira dzavadzimu music and performance practice has been in existence since the pre-colonial era. It played a crucial role in ritual and non-ritual activities of the Shona people of Zimbabwe. However, political, social and global influences as well as technological advancement have resulted in change of context and performance practice. Unfortunately, these have not been recorded for future generations. The major aim of the study is therefore to examine the change of context and performance practice of mbira dzavadzimu in Zimbabwe. This was achieved by reviewing mbira dzavadzimu music and performance practice within the modern setting of dandaro. I looked at change from a theoretical lens of the theory of diffusion, syncretism and mediatisation. The study was in the qualitative form superimposed on some case studies. Unstructured interviews, participant and non-participant observations were the main instruments used to collect data from both traditional and modern mbira performances. Data was also collected from museums, archives, radio and television stations. The study established that the changes in context and performance practice of mbira dzavadzimu in Zimbabwe were to a larger extent due to foreign influences such as colonialism, the coming of missionaries, modernisation, urbanisation, commercialisation, mediatisation, the use of modern technology and institutionalisation. Due to the aforementioned influences, the environmental settings, the change of context from sacred to secular, the relationship with ancestral spirits, musical practices, performance situations and quality of sound, have been modified and adjusted in response to the influences of the globalised world’s ever changing audience and performance space. In short, this has resulted in a shift of mbira performances from its traditional to modern settings, from the village to the city and onto the international scene with a new performer-audience setting. Various innovations were carried out on the instrument and its music as a result of the advent of modern technology. The use of microphones, modern amplification systems, recording studios, radio and television broadcast, audio and video cassettes, CDs, DVD, teaching of the instrument using audio and video instructional models and the use of internet sites in learning how to play mbira dzavadzimu and other instruments have become a reality. It has been evident from the study that urban and rural areas take up change in different ways and that in the former change is more pronounced than in the latter. Urban area communities are more “developed” than their rural counterparts because the former are more exposed to technological influences and the commercialisation of music. The study has also established that Zimbabwean mbira music is a good example of modern transculturality. The instrument and its music have played a major role in breaking down cultural boundaries and bringing the people of the world together for purposes of performing on the instrument. From the findings of this study, I attribute most of the changes to technologisation, for most of the changes that have taken place on mbira dzavadzimu were a result of the highly technologised way of life Zimbabweans now lead.
- Full Text:
- Date Issued: 2015
- Authors: Chipendo, Claudio
- Date: 2015
- Subjects: Mbira music -- Zimbabwe Shona (African people) -- Music
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/6357 , vital:29588
- Description: Mbira dzavadzimu music and performance practice has been in existence since the pre-colonial era. It played a crucial role in ritual and non-ritual activities of the Shona people of Zimbabwe. However, political, social and global influences as well as technological advancement have resulted in change of context and performance practice. Unfortunately, these have not been recorded for future generations. The major aim of the study is therefore to examine the change of context and performance practice of mbira dzavadzimu in Zimbabwe. This was achieved by reviewing mbira dzavadzimu music and performance practice within the modern setting of dandaro. I looked at change from a theoretical lens of the theory of diffusion, syncretism and mediatisation. The study was in the qualitative form superimposed on some case studies. Unstructured interviews, participant and non-participant observations were the main instruments used to collect data from both traditional and modern mbira performances. Data was also collected from museums, archives, radio and television stations. The study established that the changes in context and performance practice of mbira dzavadzimu in Zimbabwe were to a larger extent due to foreign influences such as colonialism, the coming of missionaries, modernisation, urbanisation, commercialisation, mediatisation, the use of modern technology and institutionalisation. Due to the aforementioned influences, the environmental settings, the change of context from sacred to secular, the relationship with ancestral spirits, musical practices, performance situations and quality of sound, have been modified and adjusted in response to the influences of the globalised world’s ever changing audience and performance space. In short, this has resulted in a shift of mbira performances from its traditional to modern settings, from the village to the city and onto the international scene with a new performer-audience setting. Various innovations were carried out on the instrument and its music as a result of the advent of modern technology. The use of microphones, modern amplification systems, recording studios, radio and television broadcast, audio and video cassettes, CDs, DVD, teaching of the instrument using audio and video instructional models and the use of internet sites in learning how to play mbira dzavadzimu and other instruments have become a reality. It has been evident from the study that urban and rural areas take up change in different ways and that in the former change is more pronounced than in the latter. Urban area communities are more “developed” than their rural counterparts because the former are more exposed to technological influences and the commercialisation of music. The study has also established that Zimbabwean mbira music is a good example of modern transculturality. The instrument and its music have played a major role in breaking down cultural boundaries and bringing the people of the world together for purposes of performing on the instrument. From the findings of this study, I attribute most of the changes to technologisation, for most of the changes that have taken place on mbira dzavadzimu were a result of the highly technologised way of life Zimbabweans now lead.
- Full Text:
- Date Issued: 2015
Perceived undersupply of local labour in the presence of unemployment: a case of selected Sundays River Valley citrus farms, 2013
- Authors: Chirara, Malon Tinotenda
- Date: 2015
- Subjects: Unemployment -- South Africa -- Sundays River (Eastern Cape) , Citrus fruit industry -- South Africa -- Sundays River (Eastern Cape) , Labor market -- South Africa -- Sundays River (Eastern Cape) , Work environment -- South Africa -- Sundays River (Eastern Cape) , Agricultural wages -- South Africa -- Sundays River (Eastern Cape) , Agricultural laborers -- South Africa -- Sundays River (Eastern Cape) , Seasonal labor -- South Africa -- Sundays River (Eastern Cape) , Migrant agricultural laborers -- South Africa -- Sundays River (Eastern Cape) , Personnel management -- South Africa -- Sundays River (Eastern Cape)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1125 , http://hdl.handle.net/10962/d1020367
- Description: While skilled labour shortages are common in many countries, including South Africa, mainly due to a skills mismatch, the undersupply of unskilled labour was less expected, especially in developing countries with high unemployment. The thesis utilises data on perceived worker undersupply on selected citrus farms in the Sundays River Valley (SRV), located in the Eastern Cape Province of South Africa, collected in 2013, to analyse why unemployed residents, surprisingly, do not fill up vacancies on farms. In contrast to other labour markets, farm employment is not restricted by educational levels and as workers reported, with little training the various job tasks and skills required are easy and quick to grasp. At a time the government is trying to find ways of reducing unemployment, and the SRV Municipality (2012:29) reported approximately 42% unemployment, the question arises as to why the relatively low educated residents do not take advantage of the employment opportunities on farms. According to local workers and unemployed residents, the farm job was unattractive largely because of a combination of two factors: perceived relatively low salaries partly caused by the availability of migrant seasonal workers accepting lower remuneration and poor non-wage working conditions. The survey also found that farmers preferred migrant workers because they were more productive compared to their local counterparts who were, reportedly, characterised by high absenteeism and laziness, caused mainly by a reliance on social grants and alcohol abuse. Other reasons given for the unattractiveness of the farm job included the seasonal nature of farm employment, which left workers with no source of income in the offseason, the redundancy associated with farm tasks, perceived poor treatment of workers and lack of information on UIF and Provident funds to farm workers. To address problems associated with the dislike of farm work, seasonality of on-farm employment and the reportedly relatively low income, farm managers, the local municipality and the Labour Department could possibly be involved in creating more communal agricultural projects and help provide local community members to venture into supporting alternative careers within the Hospitality, Ecotourism and Conservation Industries through training programmes. Farm managers may need to consider improving their working relationship with workers in communication and when assigning tasks. Farmers and the local municipality could also consider investing in training programmes for the unemployed residents to equip them with technical skills that can improve their chances of finding jobs.
- Full Text:
- Date Issued: 2015
- Authors: Chirara, Malon Tinotenda
- Date: 2015
- Subjects: Unemployment -- South Africa -- Sundays River (Eastern Cape) , Citrus fruit industry -- South Africa -- Sundays River (Eastern Cape) , Labor market -- South Africa -- Sundays River (Eastern Cape) , Work environment -- South Africa -- Sundays River (Eastern Cape) , Agricultural wages -- South Africa -- Sundays River (Eastern Cape) , Agricultural laborers -- South Africa -- Sundays River (Eastern Cape) , Seasonal labor -- South Africa -- Sundays River (Eastern Cape) , Migrant agricultural laborers -- South Africa -- Sundays River (Eastern Cape) , Personnel management -- South Africa -- Sundays River (Eastern Cape)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1125 , http://hdl.handle.net/10962/d1020367
- Description: While skilled labour shortages are common in many countries, including South Africa, mainly due to a skills mismatch, the undersupply of unskilled labour was less expected, especially in developing countries with high unemployment. The thesis utilises data on perceived worker undersupply on selected citrus farms in the Sundays River Valley (SRV), located in the Eastern Cape Province of South Africa, collected in 2013, to analyse why unemployed residents, surprisingly, do not fill up vacancies on farms. In contrast to other labour markets, farm employment is not restricted by educational levels and as workers reported, with little training the various job tasks and skills required are easy and quick to grasp. At a time the government is trying to find ways of reducing unemployment, and the SRV Municipality (2012:29) reported approximately 42% unemployment, the question arises as to why the relatively low educated residents do not take advantage of the employment opportunities on farms. According to local workers and unemployed residents, the farm job was unattractive largely because of a combination of two factors: perceived relatively low salaries partly caused by the availability of migrant seasonal workers accepting lower remuneration and poor non-wage working conditions. The survey also found that farmers preferred migrant workers because they were more productive compared to their local counterparts who were, reportedly, characterised by high absenteeism and laziness, caused mainly by a reliance on social grants and alcohol abuse. Other reasons given for the unattractiveness of the farm job included the seasonal nature of farm employment, which left workers with no source of income in the offseason, the redundancy associated with farm tasks, perceived poor treatment of workers and lack of information on UIF and Provident funds to farm workers. To address problems associated with the dislike of farm work, seasonality of on-farm employment and the reportedly relatively low income, farm managers, the local municipality and the Labour Department could possibly be involved in creating more communal agricultural projects and help provide local community members to venture into supporting alternative careers within the Hospitality, Ecotourism and Conservation Industries through training programmes. Farm managers may need to consider improving their working relationship with workers in communication and when assigning tasks. Farmers and the local municipality could also consider investing in training programmes for the unemployed residents to equip them with technical skills that can improve their chances of finding jobs.
- Full Text:
- Date Issued: 2015
Efficiency evaluation of South Africa tertiary education institutions using data envelopment analysis
- Authors: Chitekedza, Ignatious
- Date: 2015
- Subjects: Data envelopment analysis -- South Africa , Principal components analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/4764 , vital:20674
- Description: With an increasing number of students enrolling at higher education institutions in South Africa, it has become important to investigate whether these institutions are using their resources adequately. This study uses data envelopment analysis (DEA) to estimate the efficiency of 23 South African tertiary education institutions based on both teaching and research outputs. Using DEA we are able to rank South African universities according to their use of resources in these two areas. These rankings can identify institutions which are performing well and also those which require improvement. The effect that merging institutions has on this efficiency is also determined. Owing to the limited sample size, variable reduction techniques, including the efficiency contribution measure (ECM) and principal components analysis (PCA-DEA), were used to improve the discrimination of the analysis.
- Full Text:
- Date Issued: 2015
- Authors: Chitekedza, Ignatious
- Date: 2015
- Subjects: Data envelopment analysis -- South Africa , Principal components analysis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/4764 , vital:20674
- Description: With an increasing number of students enrolling at higher education institutions in South Africa, it has become important to investigate whether these institutions are using their resources adequately. This study uses data envelopment analysis (DEA) to estimate the efficiency of 23 South African tertiary education institutions based on both teaching and research outputs. Using DEA we are able to rank South African universities according to their use of resources in these two areas. These rankings can identify institutions which are performing well and also those which require improvement. The effect that merging institutions has on this efficiency is also determined. Owing to the limited sample size, variable reduction techniques, including the efficiency contribution measure (ECM) and principal components analysis (PCA-DEA), were used to improve the discrimination of the analysis.
- Full Text:
- Date Issued: 2015
An investigation into the perceptions of female academics on their career development: a comparative study of South African and Zimbabwean universities
- Chitsamatanga, Bellita Banda
- Authors: Chitsamatanga, Bellita Banda
- Date: 2015
- Subjects: Career development -- Education (Higher) -- Africa , College teachers -- Africa , Universities and colleges -- Africa
- Language: English
- Type: Thesis , Masters , M Ed
- Identifier: vital:16223 , http://hdl.handle.net/10353/d1019735 , Career development -- Education (Higher) -- Africa , College teachers -- Africa , Universities and colleges -- Africa
- Description: This study investigated the perceptions of female academics on their career development in South African and Zimbabwean universities. The study attempted to unravel the story of the female academics which must be heard but is seldom accorded the space within the academia. The interpretive paradigm was utilised in this study because it focuses on individual perceptions and experiences. In addition a qualititative approach was employed for the collection of data since it allowed for triangulation of data collection techniques so as to gain in-depth and rich information on the career trajectory of female academics in South African and Zimbabwean universities. Therefore, semi-structured interviews, focus group interviews and document analysis were employed. The participants were purposively selected for the sample of this study and comprised of 5 senior female academics from each university and 5 junior female academics also representing each university respectively. Thematic content analysis was used to analyse data and this was carried out in line with the research questions, aims and objectives of the study. Through the participants' answers from both universities under study, a transcript was formulated, coded and categorised in view of the career development of female academics in South African and Zimbabwean universities. It was discovered from the data that the female academics still encounter a number of challenges with regard to their career mobility both in and out of academia inter alia, (1) gender stereotyping and male domination (2) knowledge retention (3) lack of mentorship and organisational support especially through funding and professional staff development programmes (4) lack of female solidarity (5) under-representation of female academics (6) teaching workloads and research publications and (7) lack of family support, were illuminated by the participants as common fixtures that hinder their career development in academia. Moreover, there were variances in both universities under study especially with relations to funding, gender policies in place and male domination. Consequently, the above mentioned factors were more pronounced in Zimbabwean universities than in South African universities. As a result, emphasis was that both South African and Zimbabwean universities have to draw a line between theory and practice especially on the professional staff development programmes that are offered to the academics. A crucial observation was made by the researcher on how most of the participants from both universities under study had negotiated their roles as mothers, wifes, academic and sisters in a bid to realise career growth, such that striking a balance between work and family posed a continuous hindrance their career development. As a result, hard work, commitment, confidence, self-assertiveness and sacrifice cut across both universities as strategies used if the battle of career development of female academics had to be won. In sum, this study attempted to illuminate the perceptions and experiences of female academics and what it means to be a female academicin the 21st century universityn and why there is a need to create, cultivate and have a conducive and supportive working environment. Moreover, promotion of knowledge expansion and sharing, gender equity and equality needs to be employed by both universities under research. Additionally, the professtional staff development programmes offered need to be conducted by qualified and experienced personnel in a bid to avoid repetition of workshops and training programs. Furthermore, formalisation of mentoring and role modelling should also be employed by South African and Zimbabwean universities. Lastly, the study recommended that there is a need for universities source out resources for its academics if there are to produce well rounded scholars who will be able to experience career development.
- Full Text:
- Date Issued: 2015
- Authors: Chitsamatanga, Bellita Banda
- Date: 2015
- Subjects: Career development -- Education (Higher) -- Africa , College teachers -- Africa , Universities and colleges -- Africa
- Language: English
- Type: Thesis , Masters , M Ed
- Identifier: vital:16223 , http://hdl.handle.net/10353/d1019735 , Career development -- Education (Higher) -- Africa , College teachers -- Africa , Universities and colleges -- Africa
- Description: This study investigated the perceptions of female academics on their career development in South African and Zimbabwean universities. The study attempted to unravel the story of the female academics which must be heard but is seldom accorded the space within the academia. The interpretive paradigm was utilised in this study because it focuses on individual perceptions and experiences. In addition a qualititative approach was employed for the collection of data since it allowed for triangulation of data collection techniques so as to gain in-depth and rich information on the career trajectory of female academics in South African and Zimbabwean universities. Therefore, semi-structured interviews, focus group interviews and document analysis were employed. The participants were purposively selected for the sample of this study and comprised of 5 senior female academics from each university and 5 junior female academics also representing each university respectively. Thematic content analysis was used to analyse data and this was carried out in line with the research questions, aims and objectives of the study. Through the participants' answers from both universities under study, a transcript was formulated, coded and categorised in view of the career development of female academics in South African and Zimbabwean universities. It was discovered from the data that the female academics still encounter a number of challenges with regard to their career mobility both in and out of academia inter alia, (1) gender stereotyping and male domination (2) knowledge retention (3) lack of mentorship and organisational support especially through funding and professional staff development programmes (4) lack of female solidarity (5) under-representation of female academics (6) teaching workloads and research publications and (7) lack of family support, were illuminated by the participants as common fixtures that hinder their career development in academia. Moreover, there were variances in both universities under study especially with relations to funding, gender policies in place and male domination. Consequently, the above mentioned factors were more pronounced in Zimbabwean universities than in South African universities. As a result, emphasis was that both South African and Zimbabwean universities have to draw a line between theory and practice especially on the professional staff development programmes that are offered to the academics. A crucial observation was made by the researcher on how most of the participants from both universities under study had negotiated their roles as mothers, wifes, academic and sisters in a bid to realise career growth, such that striking a balance between work and family posed a continuous hindrance their career development. As a result, hard work, commitment, confidence, self-assertiveness and sacrifice cut across both universities as strategies used if the battle of career development of female academics had to be won. In sum, this study attempted to illuminate the perceptions and experiences of female academics and what it means to be a female academicin the 21st century universityn and why there is a need to create, cultivate and have a conducive and supportive working environment. Moreover, promotion of knowledge expansion and sharing, gender equity and equality needs to be employed by both universities under research. Additionally, the professtional staff development programmes offered need to be conducted by qualified and experienced personnel in a bid to avoid repetition of workshops and training programs. Furthermore, formalisation of mentoring and role modelling should also be employed by South African and Zimbabwean universities. Lastly, the study recommended that there is a need for universities source out resources for its academics if there are to produce well rounded scholars who will be able to experience career development.
- Full Text:
- Date Issued: 2015
Synthesis and biological evaluation of truncated sarganaphthoquinoic acid derivatives as Hsp90 inhibitors
- Authors: Chiwakata, Maynard T
- Date: 2015
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/64708 , vital:28594
- Description: Hsp90 inhibition has been at the centre of attention in current research due to the possibility of “cracking down” on the entire process leading to the development of malignant cancers. Small underlying principles common in all types of cancers have been determined that govern the transformation of normal human cells into cancerous cells, with all relying on the ATPase activity of Hsp90 protein. Hsp90 protein is therefore an attractive drug target that if successfully inhibited can result in the remission of cancer tumours by one form of treatment. To date, no Hsp90 inhibitor has been sanctioned for cancer treatment as most are still in clinical development. Our research was therefore inspired by reports that indicated the potential of quinones / naphthoquinones to act as Hsp90 inhibitors. Preliminary results of a few selected marine natural product quinone systems i.e. sargaquinoic acid (SQA) (2.47) and lapachol (3.6) showed moderate cytotoxicity and weak interactions with the Hsp90 molecular chaperone, and evidence suggested C-terminal binding of these molecules. No correlation has been determined yet between cytotoxicity and Hsp90 inhibition, hence we aimed to develop natural product inspired molecules that exhibit both cytotoxic and Hsp90 inhibition properties. Due to limited amounts of the natural product that can be acquired from natural sources, synthetic analogues were opted for. Isolation of a few selected quinones was conducted to have material that could be used in biological assays. For structural modifications, a series of truncated naphthoquinone systems were prepared adopting the sarganaphthoquinoic acid (3.5) scaffold. The naphthoquinones were prepared via Diels-Alder reactions of relevant benzoquinones with myrcene, followed by aromatization reactions using MnO2. Various alkyl and aryl amines were then coupled to the C-2/3 position of the naphthoquinone using Michael’s addition reactions. Tricyclic naphthoquinones were also synthesized from reactions with hypotaurine and citral. Design of the analogues incorporated functionalities from known Hsp90 inhibitors e.g. geldanamycin (2.28) and its analogues. Preliminary results obtained showed that coupling of naphthoquinones with aryl-amines resulted in the most cytotoxic compounds (4.14-4.19) with IC50 values as low as 0.3 μM against Hs578T breast cancer carcinoma (triple negative). Most of the alkyl amines (4.20-4.25) had IC50 values greater than 50 μM except for 4.20 and 4.21 that showed IC50 values of 7.6 μM and 2.6 μM respectively. Tricyclic naphthoquinones (4.28-4.29) showed moderate cytotoxic activity of approximately 10 μM. Hsp90 inhibition was assessed by client protein degradation assays, of which SQA (2.47), showed the best Hsp90 inhibition properties, followed by compound 4.20. The most cytotoxic arylamino-naphthoquinone (4.16) and tricyclic naphthoquinones (4.28-4.29) showed only moderate inhibition. None of the compounds led to Hsp70 induction, suggesting possible binding to the C-terminus of Hsp90. Interactions at the binding site were assessed by molecular docking studies and saturation transfer difference (STD) NMR. Docking studies were conducted on the N-terminus of Hsp90 and better binding was observed for arylamino naphthoquinones (4.14-4.19) than for other series of compounds. Unfortunately, the co-crystal structure for the C-terminus of Hsp90 is unavailable, hence docking study comparisons on both domains could not be conducted. However, STD NMR offered a platform to assess binding interactions between the naphthoquinones and the N- or C-terminal domains of Hsp90. However no interactions were observed at both the N- and C- termini of Hsp90 due to either weak binding of ligands to the protein or poor water solubility of the ligands. From these preliminary results, naphthoquinones bind to Hsp90 protein but conclusive remarks to which terminal domain they bind to could not be made. The best candidate from amongst the series of naphthoquinones prepared that showed moderate cytotoxicity and promising Hsp90 inhibition was compound 4.20. We therefore succeeded in developing a new series of naphthoquinones that possess moderate cytotoxicity and show Hsp90 inhibition.
- Full Text:
- Date Issued: 2015
- Authors: Chiwakata, Maynard T
- Date: 2015
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/64708 , vital:28594
- Description: Hsp90 inhibition has been at the centre of attention in current research due to the possibility of “cracking down” on the entire process leading to the development of malignant cancers. Small underlying principles common in all types of cancers have been determined that govern the transformation of normal human cells into cancerous cells, with all relying on the ATPase activity of Hsp90 protein. Hsp90 protein is therefore an attractive drug target that if successfully inhibited can result in the remission of cancer tumours by one form of treatment. To date, no Hsp90 inhibitor has been sanctioned for cancer treatment as most are still in clinical development. Our research was therefore inspired by reports that indicated the potential of quinones / naphthoquinones to act as Hsp90 inhibitors. Preliminary results of a few selected marine natural product quinone systems i.e. sargaquinoic acid (SQA) (2.47) and lapachol (3.6) showed moderate cytotoxicity and weak interactions with the Hsp90 molecular chaperone, and evidence suggested C-terminal binding of these molecules. No correlation has been determined yet between cytotoxicity and Hsp90 inhibition, hence we aimed to develop natural product inspired molecules that exhibit both cytotoxic and Hsp90 inhibition properties. Due to limited amounts of the natural product that can be acquired from natural sources, synthetic analogues were opted for. Isolation of a few selected quinones was conducted to have material that could be used in biological assays. For structural modifications, a series of truncated naphthoquinone systems were prepared adopting the sarganaphthoquinoic acid (3.5) scaffold. The naphthoquinones were prepared via Diels-Alder reactions of relevant benzoquinones with myrcene, followed by aromatization reactions using MnO2. Various alkyl and aryl amines were then coupled to the C-2/3 position of the naphthoquinone using Michael’s addition reactions. Tricyclic naphthoquinones were also synthesized from reactions with hypotaurine and citral. Design of the analogues incorporated functionalities from known Hsp90 inhibitors e.g. geldanamycin (2.28) and its analogues. Preliminary results obtained showed that coupling of naphthoquinones with aryl-amines resulted in the most cytotoxic compounds (4.14-4.19) with IC50 values as low as 0.3 μM against Hs578T breast cancer carcinoma (triple negative). Most of the alkyl amines (4.20-4.25) had IC50 values greater than 50 μM except for 4.20 and 4.21 that showed IC50 values of 7.6 μM and 2.6 μM respectively. Tricyclic naphthoquinones (4.28-4.29) showed moderate cytotoxic activity of approximately 10 μM. Hsp90 inhibition was assessed by client protein degradation assays, of which SQA (2.47), showed the best Hsp90 inhibition properties, followed by compound 4.20. The most cytotoxic arylamino-naphthoquinone (4.16) and tricyclic naphthoquinones (4.28-4.29) showed only moderate inhibition. None of the compounds led to Hsp70 induction, suggesting possible binding to the C-terminus of Hsp90. Interactions at the binding site were assessed by molecular docking studies and saturation transfer difference (STD) NMR. Docking studies were conducted on the N-terminus of Hsp90 and better binding was observed for arylamino naphthoquinones (4.14-4.19) than for other series of compounds. Unfortunately, the co-crystal structure for the C-terminus of Hsp90 is unavailable, hence docking study comparisons on both domains could not be conducted. However, STD NMR offered a platform to assess binding interactions between the naphthoquinones and the N- or C-terminal domains of Hsp90. However no interactions were observed at both the N- and C- termini of Hsp90 due to either weak binding of ligands to the protein or poor water solubility of the ligands. From these preliminary results, naphthoquinones bind to Hsp90 protein but conclusive remarks to which terminal domain they bind to could not be made. The best candidate from amongst the series of naphthoquinones prepared that showed moderate cytotoxicity and promising Hsp90 inhibition was compound 4.20. We therefore succeeded in developing a new series of naphthoquinones that possess moderate cytotoxicity and show Hsp90 inhibition.
- Full Text:
- Date Issued: 2015
Conscientious objection and South African medical practitioners' constructions of termination of pregnancy and emergency contraception
- Authors: Chiwandire, Desire
- Date: 2015
- Subjects: Abortion -- South Africa , Abortion -- Moral and ethical aspects -- South Africa , Emergency contraceptives -- South Africa , Contraception -- Moral and ethical aspects -- South Africa , Medical personnel -- Attitudes -- South Africa , Patients -- Legal status, laws, etc. -- South Africa , Reproductive rights -- South Africa , Women's rights -- South Africa , Liberty of conscience
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:2888 , http://hdl.handle.net/10962/d1017863
- Description: Aim: The 1996 Choice on Termination of Pregnancy Act decriminalized abortion in South Africa and the South African Medicines Control Council in 2000 approved the dispensing of emergency contraceptive methods by pharmacists to women without a doctor's prescription. This legislation has been hailed as among the most progressive in the world with respect to women's reproductive justice. However the realisation of these rights in practice has not always met expectations in part due to medical practitioners' ethical objections to termination of pregnancy and the provision of related services. The aim of this study was to interpret the varying ways in which medical practitioners frame termination of pregnancy and emergency contraceptive services, their own professional identities and that of their patients/clients. Methods: Sample of 58 doctors and 59 pharmacists drawn from all nine provinces of South Africa. Data collected using an anonymous confidential internet-based self-administered questionnaire. Participants were randomly recruited from online listings of South African doctors and pharmacists practicing in both private and public sectors. Data were analysed using theoretically derived qualitative content analysis. Results: Participants drew on eight frames to justify their willingness or unwillingness to provide termination-of-pregnancy related services: the foetal life frame, the women's rights frame, the balancing frame, the social justice frame, the do no harm frame, the legal and professional obligation frame, the consequences frame and the moral absolutist frame. Conclusion: Health professionals' willingness or unwillingness to provide termination of pregnancy related services is highly dependent on how they frame or understand termination of pregnancy, and how they understand their own professional identities and those of their patients/clients.
- Full Text:
- Date Issued: 2015
- Authors: Chiwandire, Desire
- Date: 2015
- Subjects: Abortion -- South Africa , Abortion -- Moral and ethical aspects -- South Africa , Emergency contraceptives -- South Africa , Contraception -- Moral and ethical aspects -- South Africa , Medical personnel -- Attitudes -- South Africa , Patients -- Legal status, laws, etc. -- South Africa , Reproductive rights -- South Africa , Women's rights -- South Africa , Liberty of conscience
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:2888 , http://hdl.handle.net/10962/d1017863
- Description: Aim: The 1996 Choice on Termination of Pregnancy Act decriminalized abortion in South Africa and the South African Medicines Control Council in 2000 approved the dispensing of emergency contraceptive methods by pharmacists to women without a doctor's prescription. This legislation has been hailed as among the most progressive in the world with respect to women's reproductive justice. However the realisation of these rights in practice has not always met expectations in part due to medical practitioners' ethical objections to termination of pregnancy and the provision of related services. The aim of this study was to interpret the varying ways in which medical practitioners frame termination of pregnancy and emergency contraceptive services, their own professional identities and that of their patients/clients. Methods: Sample of 58 doctors and 59 pharmacists drawn from all nine provinces of South Africa. Data collected using an anonymous confidential internet-based self-administered questionnaire. Participants were randomly recruited from online listings of South African doctors and pharmacists practicing in both private and public sectors. Data were analysed using theoretically derived qualitative content analysis. Results: Participants drew on eight frames to justify their willingness or unwillingness to provide termination-of-pregnancy related services: the foetal life frame, the women's rights frame, the balancing frame, the social justice frame, the do no harm frame, the legal and professional obligation frame, the consequences frame and the moral absolutist frame. Conclusion: Health professionals' willingness or unwillingness to provide termination of pregnancy related services is highly dependent on how they frame or understand termination of pregnancy, and how they understand their own professional identities and those of their patients/clients.
- Full Text:
- Date Issued: 2015
Political communication: a case study of the Democratic Alliance and its use of digital media in the 2014 South African General Elections
- Authors: Chong, Sandra Pow
- Date: 2015
- Subjects: Communication -- Political aspects -- South Africa Mass media -- Political aspects -- South Africa Political campaigns -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/11416 , vital:26923
- Description: Political organisations are now using a two-way path of communication thanks to the development of technological platforms that work in-sync with the internet to allow this to happen. Information can now flow across new networks to allow exchanges from the many to the many. This study sets out to explore the use of social media by political organisations as a means of political communication. A case study was conducted which focussed on online communication used by the Democratic Alliance in the 2014 General Elections in South Africa. The social media strategies adopted by the Democratic Alliance was examined. Reference is made to the 2008 Obama Campaign. The study revealed that the DA primarily made use of two-way asymmetrical communication despite the party posting a lot of consistent information and content; however in response to many questions and comments posted on the social media fora by online users, the DA only selectively responded to a handful of these.
- Full Text:
- Date Issued: 2015
- Authors: Chong, Sandra Pow
- Date: 2015
- Subjects: Communication -- Political aspects -- South Africa Mass media -- Political aspects -- South Africa Political campaigns -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/11416 , vital:26923
- Description: Political organisations are now using a two-way path of communication thanks to the development of technological platforms that work in-sync with the internet to allow this to happen. Information can now flow across new networks to allow exchanges from the many to the many. This study sets out to explore the use of social media by political organisations as a means of political communication. A case study was conducted which focussed on online communication used by the Democratic Alliance in the 2014 General Elections in South Africa. The social media strategies adopted by the Democratic Alliance was examined. Reference is made to the 2008 Obama Campaign. The study revealed that the DA primarily made use of two-way asymmetrical communication despite the party posting a lot of consistent information and content; however in response to many questions and comments posted on the social media fora by online users, the DA only selectively responded to a handful of these.
- Full Text:
- Date Issued: 2015
Love in a cold war
- Authors: Christenson, Anna
- Date: 2015
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:5988
- Description: A collection of short stories in two parts written in realist and fabulist styles. The first part looks at the post-war generation of baby boomers growing up in the American Midwest. The second half follows an American abroad and explores themes of disintegration, the shifting power balance in relationships and the terrible hole at the core of expatriate identity.
- Full Text:
- Date Issued: 2015
- Authors: Christenson, Anna
- Date: 2015
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:5988
- Description: A collection of short stories in two parts written in realist and fabulist styles. The first part looks at the post-war generation of baby boomers growing up in the American Midwest. The second half follows an American abroad and explores themes of disintegration, the shifting power balance in relationships and the terrible hole at the core of expatriate identity.
- Full Text:
- Date Issued: 2015
The effects of distance travelled, lairage duration and animal-related factors on pre-slaughter stress indicators, carcass characteristics, nanostructure and technological properties of beef
- Authors: Chulayo, Amanda Yucca
- Date: 2015
- Subjects: Slaughtering and slaughter-houses -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Beef -- Quality -- South Africa -- Eastern Cape , Nanostructured materials -- South Africa -- Eastern Cape , Livestock -- Handling -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Animal Science)
- Identifier: vital:11835 , http://hdl.handle.net/10353/d1021275 , Slaughtering and slaughter-houses -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Beef -- Quality -- South Africa -- Eastern Cape , Nanostructured materials -- South Africa -- Eastern Cape , Livestock -- Handling -- South Africa -- Eastern Cape
- Description: The main objective of the current study was to determine the effect of distance travelled (DT), lairage duration (LDhr) and animal-related factors (animal class, breed, sex) on pre-slaughter stress indicators, carcass characteristics, nanostructure and technological properties of beef. The study was conducted in an Eastern Cape abattoir under the Buffalo City District Municipality. Six genotypes of cattle (Beefmaster, Bonsmara, Brahman, Holstein-Friesian, Non-descript and Nguni) brought for slaughter at the abattoir on different days were used in the study. Slaughter weight (SWT), warm and cold carcass weight (WCW and CCW), fatness and conformation of each animal were measured and recorded. Representative samples of blood plasma and meat quality from the Muscularis thoracis et lumborum (LTL) were collected at slaughter and 24 hours after slaughter, respectively. Heat shock proteins 70kDa (HSPA1A), glucose (GLU), cortisol (CORT), creatine kinase (CK) and lactate dehydrogenase (LDH) were determined from the blood plasma. The representative LTL muscle was used to determine ultimate pH (pHu), lightness (L*), redness (a*), yellowness (b*), meat temperature (Tm), Warner Bratzler Shear Force (WBSF) and histological structure of beef. There were significant effects of distance on pHu, Tm, a*, b*, TL%, CK and LDH. Pearson correlations were observed between distance travelled (DT), creatine kinase (CK), lactate dehydrogenase (LDH), ultimate pH (pHu), colour coordinates (L*, a* and b*) and Warner Bratzler Shear Force (WBSF). Principal component analysis (PCA) revealed that the 1st (pHu), 2nd (Tm) and 3rd (L*) principal components were the critical meat quality attributes. Positive relationships between carcass weights and beef quality characteristics for bovine cattle where the cumulative percentage of the first six principal component`s (PC`s) (SWT, WCW, CCW, DP, pHu and Tm contributed to 93.4 % of the total variance. Significant correlation coefficients between DT (r = 0.15), LDhr (r = 0.29), Ta (r = -0.52), Tm (r = 0.26), L* (r = 0.33), a* (r = 0.32) and WBSF (r = -0.49) were observed. Meat from Brahman (BR), Non-descript (ND) and Nguni (NG) cows had visible skeletal muscle fibres which were thin and long indicating improved tenderness of beef. Exposing animals to longer hours of transportation did not only reduce glucose levels but also increased the expression of HSPA1A and levels of cortisol. The CK and LDH were not related to beef quality. Therefore, CK and LDH can be used as indicators of animal welfare in slaughter cattle but cannot be used to predict the quality of meat. Bulls were the heaviest, although heifers had the highest dressing percentage than cows. Furthermore, the nanostructure of beef indicated that heifers had the best muscle fibres, sarcomere length and visible intercalated discs. The observed nanostructures of Nguni genotype are an indication of tender meat. Beef from heifers of Nguni had visible and tender meat with traces of intramuscular fat while males had shorter sarcomere length and tougher meat.
- Full Text:
- Date Issued: 2015
- Authors: Chulayo, Amanda Yucca
- Date: 2015
- Subjects: Slaughtering and slaughter-houses -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Beef -- Quality -- South Africa -- Eastern Cape , Nanostructured materials -- South Africa -- Eastern Cape , Livestock -- Handling -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Animal Science)
- Identifier: vital:11835 , http://hdl.handle.net/10353/d1021275 , Slaughtering and slaughter-houses -- South Africa -- Eastern Cape , Meat -- Quality -- South Africa -- Eastern Cape , Beef -- Quality -- South Africa -- Eastern Cape , Nanostructured materials -- South Africa -- Eastern Cape , Livestock -- Handling -- South Africa -- Eastern Cape
- Description: The main objective of the current study was to determine the effect of distance travelled (DT), lairage duration (LDhr) and animal-related factors (animal class, breed, sex) on pre-slaughter stress indicators, carcass characteristics, nanostructure and technological properties of beef. The study was conducted in an Eastern Cape abattoir under the Buffalo City District Municipality. Six genotypes of cattle (Beefmaster, Bonsmara, Brahman, Holstein-Friesian, Non-descript and Nguni) brought for slaughter at the abattoir on different days were used in the study. Slaughter weight (SWT), warm and cold carcass weight (WCW and CCW), fatness and conformation of each animal were measured and recorded. Representative samples of blood plasma and meat quality from the Muscularis thoracis et lumborum (LTL) were collected at slaughter and 24 hours after slaughter, respectively. Heat shock proteins 70kDa (HSPA1A), glucose (GLU), cortisol (CORT), creatine kinase (CK) and lactate dehydrogenase (LDH) were determined from the blood plasma. The representative LTL muscle was used to determine ultimate pH (pHu), lightness (L*), redness (a*), yellowness (b*), meat temperature (Tm), Warner Bratzler Shear Force (WBSF) and histological structure of beef. There were significant effects of distance on pHu, Tm, a*, b*, TL%, CK and LDH. Pearson correlations were observed between distance travelled (DT), creatine kinase (CK), lactate dehydrogenase (LDH), ultimate pH (pHu), colour coordinates (L*, a* and b*) and Warner Bratzler Shear Force (WBSF). Principal component analysis (PCA) revealed that the 1st (pHu), 2nd (Tm) and 3rd (L*) principal components were the critical meat quality attributes. Positive relationships between carcass weights and beef quality characteristics for bovine cattle where the cumulative percentage of the first six principal component`s (PC`s) (SWT, WCW, CCW, DP, pHu and Tm contributed to 93.4 % of the total variance. Significant correlation coefficients between DT (r = 0.15), LDhr (r = 0.29), Ta (r = -0.52), Tm (r = 0.26), L* (r = 0.33), a* (r = 0.32) and WBSF (r = -0.49) were observed. Meat from Brahman (BR), Non-descript (ND) and Nguni (NG) cows had visible skeletal muscle fibres which were thin and long indicating improved tenderness of beef. Exposing animals to longer hours of transportation did not only reduce glucose levels but also increased the expression of HSPA1A and levels of cortisol. The CK and LDH were not related to beef quality. Therefore, CK and LDH can be used as indicators of animal welfare in slaughter cattle but cannot be used to predict the quality of meat. Bulls were the heaviest, although heifers had the highest dressing percentage than cows. Furthermore, the nanostructure of beef indicated that heifers had the best muscle fibres, sarcomere length and visible intercalated discs. The observed nanostructures of Nguni genotype are an indication of tender meat. Beef from heifers of Nguni had visible and tender meat with traces of intramuscular fat while males had shorter sarcomere length and tougher meat.
- Full Text:
- Date Issued: 2015
A geoscientific framework for the proposed site of South Africa's second nuclear power plant: Thyspunt, Eastern Cape
- Authors: Claassen, Debbie
- Date: 2015
- Subjects: Geology, Structural -- South Africa -- Eastern Cape , Geology, Stratigraphic , Geochemistry , Rock mechanics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10678 , http://hdl.handle.net/10948/d1021182
- Description: This study describes the bedrock lithologies and structure of the Ordovician to early Devonian (485-419 Ma) Table Mountain Group (TMG), the Devonian (419-358 Ma) lower Bokkeveld Group, and the Miocene to Holocene (<23 Ma) overburden sediments of the Algoa Group within an area identified by Eskom for the potential construction of South Africa’s second proposed nuclear power plant (NPP), ‘Nuclear-1’. The study area is located along the southern coastal margin of the Eastern Cape Province, South Africa, between Oyster Bay and St. Francis (approximately 88 km west of Port Elizabeth), and encompasses the Thyspunt site where the proposed NPP will be built. The study aims to supplement existing information about the Thyspunt area, related to the geoscientific topic ‘Geological Setting’, as outlined in section 2.5.1.1 of the US Nuclear Regulatory Commission (USNRC) Standard Review Plan NUREG-800, which details the geological information required for review of a proposed NPP. The results obtained from geoscientific studies are used to determine geological factors that may potentially affect site specific design. Factors considered include: bedrock lithology, stratigraphic bedrock contacts, bedrock palaeotopography, thickness of overburden sediments and structural geology. Work by previous authors is combined with new data to create a GIS based 2½D model of the study area’s geology (geomodel) and on which future research or interpretations can be based. Field mapping and petrographic analyses of the TMG, comprising the Peninsula, Cedarberg, Goudini, Skurweberg and Baviaanskloof Formations as well as the lower undifferentiated Bokkeveld Group were undertaken to define the study area’s lithologies and structure. Interpretation of geophysical results and the integration of existing borehole data aided in defining the variability in overburden sediments, the identification of contacts between TMG formations beneath overburden, and the palaeotopography of bedrock. Borehole data indicates a clear N-S trend in the thickness distribution of Algoa Group aeolian and marine related sediments. Four coast-parallel trending thickness zones (zones A – D) are recognized within the study area. At Thyspunt overburden thickness reaches a maximum of 61 m, approximately 1200 m from the coastline, in areas underlain by the argillaceous Goudini and Cedarberg Formations. Overburden thickness is influenced by a combination of dune relief, bedrock lithology, palaeotopography and the area’s sediment supply. Interpolation of bedrock elevation points and detailed cross sections across bedrock reveals four NW-SE trending palaeovalleys at Thyspunt, Tony’s Bay, Cape St. Francis and St. Francis, where bedrock relief (beneath overburden) is formed to be below present day sea-level. Approximately 450 m NW of Thys Bay, a 1050 m2 (area below sea-level) palaeovalley, gently sloping SE to a depth of -15.5 m asl, is cut into strata of the Goudini Formation resulting in thicker overburden fill in that area. Structural analysis of the TMG confirms that NE-SW striking strata form part of the regional SE plunging, north verging Cape St. Francis anticline. Bedding inclination is controlled by the distance away from the fold axis, varying from a 5° SE dip along the broad fold hinge to 65° along its moderately steeper SE limb. Folds within the study area plunge gently southeastward at shallow angles, with axial planes dipping steeply SW or NE. Fold axes orientated perpendicular to the fold axis of the Cape St. Francis anticline indicate a secondary stress orientation oblique to the main palaeostress direction. The previously identified 40 km long, NW-SE trending Cape St. Francis fault occurring offshore within 17.5 km of Thyspunt show no onshore continuation within the bounds of the study area. Late jointing is pervasive within the study area and four joint systems are identified. The dominant joint set J1, trends N-S to NNE - SSW; perpendicular to bedding and has a subvertical dip. Normal right-lateral and left-lateral micro-faults dip subvertically, with a displacement that ranges from a few centimetres to <3 m. Micro-faults trend parallel to joints sets J1 and J4 (ESE-WSW). Inferred faults, identified by the Atomic Energy Co-operation (AEC), are interpreted as zones of closely spaced jointing (shatter zones), and show little to no recognizable displacement. Faults and joints do not extend into the younger cover deposits of the Algoa Group and are therefore older than 23 Ma years.
- Full Text:
- Date Issued: 2015
- Authors: Claassen, Debbie
- Date: 2015
- Subjects: Geology, Structural -- South Africa -- Eastern Cape , Geology, Stratigraphic , Geochemistry , Rock mechanics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10678 , http://hdl.handle.net/10948/d1021182
- Description: This study describes the bedrock lithologies and structure of the Ordovician to early Devonian (485-419 Ma) Table Mountain Group (TMG), the Devonian (419-358 Ma) lower Bokkeveld Group, and the Miocene to Holocene (<23 Ma) overburden sediments of the Algoa Group within an area identified by Eskom for the potential construction of South Africa’s second proposed nuclear power plant (NPP), ‘Nuclear-1’. The study area is located along the southern coastal margin of the Eastern Cape Province, South Africa, between Oyster Bay and St. Francis (approximately 88 km west of Port Elizabeth), and encompasses the Thyspunt site where the proposed NPP will be built. The study aims to supplement existing information about the Thyspunt area, related to the geoscientific topic ‘Geological Setting’, as outlined in section 2.5.1.1 of the US Nuclear Regulatory Commission (USNRC) Standard Review Plan NUREG-800, which details the geological information required for review of a proposed NPP. The results obtained from geoscientific studies are used to determine geological factors that may potentially affect site specific design. Factors considered include: bedrock lithology, stratigraphic bedrock contacts, bedrock palaeotopography, thickness of overburden sediments and structural geology. Work by previous authors is combined with new data to create a GIS based 2½D model of the study area’s geology (geomodel) and on which future research or interpretations can be based. Field mapping and petrographic analyses of the TMG, comprising the Peninsula, Cedarberg, Goudini, Skurweberg and Baviaanskloof Formations as well as the lower undifferentiated Bokkeveld Group were undertaken to define the study area’s lithologies and structure. Interpretation of geophysical results and the integration of existing borehole data aided in defining the variability in overburden sediments, the identification of contacts between TMG formations beneath overburden, and the palaeotopography of bedrock. Borehole data indicates a clear N-S trend in the thickness distribution of Algoa Group aeolian and marine related sediments. Four coast-parallel trending thickness zones (zones A – D) are recognized within the study area. At Thyspunt overburden thickness reaches a maximum of 61 m, approximately 1200 m from the coastline, in areas underlain by the argillaceous Goudini and Cedarberg Formations. Overburden thickness is influenced by a combination of dune relief, bedrock lithology, palaeotopography and the area’s sediment supply. Interpolation of bedrock elevation points and detailed cross sections across bedrock reveals four NW-SE trending palaeovalleys at Thyspunt, Tony’s Bay, Cape St. Francis and St. Francis, where bedrock relief (beneath overburden) is formed to be below present day sea-level. Approximately 450 m NW of Thys Bay, a 1050 m2 (area below sea-level) palaeovalley, gently sloping SE to a depth of -15.5 m asl, is cut into strata of the Goudini Formation resulting in thicker overburden fill in that area. Structural analysis of the TMG confirms that NE-SW striking strata form part of the regional SE plunging, north verging Cape St. Francis anticline. Bedding inclination is controlled by the distance away from the fold axis, varying from a 5° SE dip along the broad fold hinge to 65° along its moderately steeper SE limb. Folds within the study area plunge gently southeastward at shallow angles, with axial planes dipping steeply SW or NE. Fold axes orientated perpendicular to the fold axis of the Cape St. Francis anticline indicate a secondary stress orientation oblique to the main palaeostress direction. The previously identified 40 km long, NW-SE trending Cape St. Francis fault occurring offshore within 17.5 km of Thyspunt show no onshore continuation within the bounds of the study area. Late jointing is pervasive within the study area and four joint systems are identified. The dominant joint set J1, trends N-S to NNE - SSW; perpendicular to bedding and has a subvertical dip. Normal right-lateral and left-lateral micro-faults dip subvertically, with a displacement that ranges from a few centimetres to <3 m. Micro-faults trend parallel to joints sets J1 and J4 (ESE-WSW). Inferred faults, identified by the Atomic Energy Co-operation (AEC), are interpreted as zones of closely spaced jointing (shatter zones), and show little to no recognizable displacement. Faults and joints do not extend into the younger cover deposits of the Algoa Group and are therefore older than 23 Ma years.
- Full Text:
- Date Issued: 2015
Fire and water : a transdisciplinary investigation of water governance in the lower Sundays River Valley, South Africa
- Authors: Clifford-Holmes, Jai Kumar
- Date: 2015
- Subjects: Lower Sundays River Valley Municipality (Eastern Cape, South Africa) , Water -- Law and legislation -- South Africa , Water-supply -- Management , Municipal services -- South Africa -- Eastern Cape , Fire extinction -- South Africa -- Eastern Cape , Integrated water development -- South Africa -- Eastern Cape , Water quality management -- South Africa -- Eastern Cape , Water resources development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6047 , http://hdl.handle.net/10962/d1017870
- Description: The implementation of water policy and the integrated management of water face multiple challenges in South Africa (SA), despite the successes of post-apartheid government programmes in which some significant equity, sustainability and efficiency milestones have been met. This study uses a series of intervention processes into municipal water service delivery to explore the context, constraints, and real-world messiness in which local water authorities operate. The equitable provision of drinking water by local government and the collaborative management of untreated water by ‘water user associations’ are two sites of institutional conflict that have been subjected to broad ‘turnaround’ and ‘transformation’ attempts at the national level. This thesis seeks to explore and understand the use of transdisciplinary research in engaging local water authorities in a process of institutional change that increases the likelihood of equitable water supply in the Lower Sundays River Valley (LSRV). Fieldwork was conducted as part of a broader action research process involving the attempted ‘turnaround’ of the Sundays River Valley Municipality (SRVM) between 2011 and 2014. A multi-method research approach was employed, which drew on institutional, ethnographic, and systems analyses within an evolving, transdisciplinary methodology. In the single case study research design, qualitative and quantitative data were collected via participant observation, interviews and documentary sources. Analytical methods included system dynamics modelling and an adapted form of the ethnographic tool of ‘thick description’, which were linked in a governance analysis. Government interventions into the SRVM failed to take account of the systemic complexity of the municipal operating environment, the interactions of which are described in this study as the ‘modes of failure’ of local government. These modes included the perpetual ‘firefighting’ responses of municipal officials to crises, and the simultaneous underinvestment in, and over-extension of, water supply infrastructure, which is a rational approach to addressing current water shortages when funds are unavailable for maintenance, refurbishment, or the construction of new infrastructure. The over-burdening of municipalities with technocratic requirements, the presence of gaps in the institutional arrangements governing water supply in the LSRV, and the lack of coordination in government interventions are analysed in this study, with policy recommendations resulting. The primary contribution of this study is in providing a substantively-contextualised case study that illustrates the value of systemic, engaged, extended, and embedded transdisciplinary research.
- Full Text:
- Date Issued: 2015
- Authors: Clifford-Holmes, Jai Kumar
- Date: 2015
- Subjects: Lower Sundays River Valley Municipality (Eastern Cape, South Africa) , Water -- Law and legislation -- South Africa , Water-supply -- Management , Municipal services -- South Africa -- Eastern Cape , Fire extinction -- South Africa -- Eastern Cape , Integrated water development -- South Africa -- Eastern Cape , Water quality management -- South Africa -- Eastern Cape , Water resources development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6047 , http://hdl.handle.net/10962/d1017870
- Description: The implementation of water policy and the integrated management of water face multiple challenges in South Africa (SA), despite the successes of post-apartheid government programmes in which some significant equity, sustainability and efficiency milestones have been met. This study uses a series of intervention processes into municipal water service delivery to explore the context, constraints, and real-world messiness in which local water authorities operate. The equitable provision of drinking water by local government and the collaborative management of untreated water by ‘water user associations’ are two sites of institutional conflict that have been subjected to broad ‘turnaround’ and ‘transformation’ attempts at the national level. This thesis seeks to explore and understand the use of transdisciplinary research in engaging local water authorities in a process of institutional change that increases the likelihood of equitable water supply in the Lower Sundays River Valley (LSRV). Fieldwork was conducted as part of a broader action research process involving the attempted ‘turnaround’ of the Sundays River Valley Municipality (SRVM) between 2011 and 2014. A multi-method research approach was employed, which drew on institutional, ethnographic, and systems analyses within an evolving, transdisciplinary methodology. In the single case study research design, qualitative and quantitative data were collected via participant observation, interviews and documentary sources. Analytical methods included system dynamics modelling and an adapted form of the ethnographic tool of ‘thick description’, which were linked in a governance analysis. Government interventions into the SRVM failed to take account of the systemic complexity of the municipal operating environment, the interactions of which are described in this study as the ‘modes of failure’ of local government. These modes included the perpetual ‘firefighting’ responses of municipal officials to crises, and the simultaneous underinvestment in, and over-extension of, water supply infrastructure, which is a rational approach to addressing current water shortages when funds are unavailable for maintenance, refurbishment, or the construction of new infrastructure. The over-burdening of municipalities with technocratic requirements, the presence of gaps in the institutional arrangements governing water supply in the LSRV, and the lack of coordination in government interventions are analysed in this study, with policy recommendations resulting. The primary contribution of this study is in providing a substantively-contextualised case study that illustrates the value of systemic, engaged, extended, and embedded transdisciplinary research.
- Full Text:
- Date Issued: 2015
Assisting in-service grade R teachers to nurture the holistic development of the five to seven year old child through music : a participatory approach
- Authors: Cloete, Erna Petronella
- Date: 2015
- Subjects: School music -- Instruction and study -- South Africa , Early childhood education , Music -- Instruction and study
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:8530 , http://hdl.handle.net/10948/d1021177
- Description: Music’s significant contribution to the holistic development of the young learner is uncontested and confirmed by views of seminal scholars, such as Nzewi 2003, Reimer 2003, Nussbaum 2001, Elliot 1994 and Merriam 1964, amongst others. As such, music education supports basic values of self-growth, self-knowledge and enjoyment. This study argues for the vital importance of music education in Grade R in the South African schooling system where teachers can successfully implement the curriculum. In post-apartheid multicultural and multi-musical South Africa music education in Grade R is the sole responsibility of the generalist Grade R teacher. However, due to inadequate training and minimal, unproductive in-service initiatives, the vast majority of Reception Year teachers assumingly do not have the required competences to teach music in a way that maximally enhances the holistic development of their learners. Findings revealed that teachers exhibited limited, if any, musical knowledge and per se, they are insufficiently skilled in the effective delivery of the curriculum in terms of music. This study acknowledges the need to equip in-service Grade R teachers with the required competences to effectively implement the national school and teach music with confidence. The lack of successful and effective continuing professional teacher development initiatives from the Department of Education and Department of Basic Education to assist Grade R teachers in teaching music, was a serious concern to me. This concern reinforced the motivation to embark on this project. In this thesis, I report on an intervention strategy aimed at enabling three Grade R practitioners at one peri- urban township school in the Eastern Cape to improve their music education competencies. These three Coloured ladies only held a Certificate in Early Childhood Development, rating at an NQF level 4 and 5. None of these practitioners had any prior music experience in music training, music making or music teaching. I utilised a Participatory Action Learning and Action Research (PALAR). PALAR combines research with development and is thus highly suitable when addressing multifaceted problems in rapidly changing environments, such as South Africa. In my study, the participants were thus actively involved in identifying problems and creating solutions. A number of collaborative interactions and qualitative data generation strategies such as Focus Group Interviews, Observations, Drawing, Interviews, Narrative Inquiry, Case Study and Reflective Journals were implemented. Findings indicated that the practitioners experienced transformation on both a professional and personal level as they discovered and tapped into their own innate musical competences. This enabled them to explore ways to teach music that enhanced the holistic development of their learners, developing them physically, cognitively emotionally, socially, and musically. Learners likewise benefitted from the intervention as they experienced social cohesion in a multicultural classroom and gained the fruits of music’s remedial impact and therapeutic value in their lives.
- Full Text:
- Date Issued: 2015
- Authors: Cloete, Erna Petronella
- Date: 2015
- Subjects: School music -- Instruction and study -- South Africa , Early childhood education , Music -- Instruction and study
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:8530 , http://hdl.handle.net/10948/d1021177
- Description: Music’s significant contribution to the holistic development of the young learner is uncontested and confirmed by views of seminal scholars, such as Nzewi 2003, Reimer 2003, Nussbaum 2001, Elliot 1994 and Merriam 1964, amongst others. As such, music education supports basic values of self-growth, self-knowledge and enjoyment. This study argues for the vital importance of music education in Grade R in the South African schooling system where teachers can successfully implement the curriculum. In post-apartheid multicultural and multi-musical South Africa music education in Grade R is the sole responsibility of the generalist Grade R teacher. However, due to inadequate training and minimal, unproductive in-service initiatives, the vast majority of Reception Year teachers assumingly do not have the required competences to teach music in a way that maximally enhances the holistic development of their learners. Findings revealed that teachers exhibited limited, if any, musical knowledge and per se, they are insufficiently skilled in the effective delivery of the curriculum in terms of music. This study acknowledges the need to equip in-service Grade R teachers with the required competences to effectively implement the national school and teach music with confidence. The lack of successful and effective continuing professional teacher development initiatives from the Department of Education and Department of Basic Education to assist Grade R teachers in teaching music, was a serious concern to me. This concern reinforced the motivation to embark on this project. In this thesis, I report on an intervention strategy aimed at enabling three Grade R practitioners at one peri- urban township school in the Eastern Cape to improve their music education competencies. These three Coloured ladies only held a Certificate in Early Childhood Development, rating at an NQF level 4 and 5. None of these practitioners had any prior music experience in music training, music making or music teaching. I utilised a Participatory Action Learning and Action Research (PALAR). PALAR combines research with development and is thus highly suitable when addressing multifaceted problems in rapidly changing environments, such as South Africa. In my study, the participants were thus actively involved in identifying problems and creating solutions. A number of collaborative interactions and qualitative data generation strategies such as Focus Group Interviews, Observations, Drawing, Interviews, Narrative Inquiry, Case Study and Reflective Journals were implemented. Findings indicated that the practitioners experienced transformation on both a professional and personal level as they discovered and tapped into their own innate musical competences. This enabled them to explore ways to teach music that enhanced the holistic development of their learners, developing them physically, cognitively emotionally, socially, and musically. Learners likewise benefitted from the intervention as they experienced social cohesion in a multicultural classroom and gained the fruits of music’s remedial impact and therapeutic value in their lives.
- Full Text:
- Date Issued: 2015
A case study: the role of a positive school climate in the enhancement of parental and community involvement at a primary school in Port Elizabeth
- Authors: Cloete, Jacqueline
- Date: 2015
- Subjects: Education -- Parent participation , Community and school , Home and school
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/8735 , vital:26425
- Description: This study examines the phenomenon of parental and community involvement in a primary school and the benefits thereof to the learners, teachers and community members. The aim of this study is to investigate how a positive school climate can improve the involvement of parents and community members in a school’s activities. The research attempted to determine what the role of a positive school climate is; the strategies schools could apply to enhance parental and community involvement, the possible benefits of involvement and reasons for non-involvement of parents and community members in school activities. The theoretical frameworks of Urie Bronfenbrenner’s ecological model and Joyce Epstein’s overlapping spheres of influence were used in the study. A case study was used as the qualitative research methodology. The data for the research was gathered from a purposive sample of teachers, community volunteer workers, parents and the principal. Semi-structured interview schedules and pre-designed questionnaires including open and closed questions, were used to collect data. The data was analysed inductively by using a descriptive open coding method to identify emerging themes. The findings of the research suggest that a positive school climate to improve parent and community involvement can be created by applying the strategies of effective communication, good working relationships, creating opportunities for involvement, ensuring a healthy and safe environment, formulating a school policy for parent and community involvement, creating a friendly and welcoming atmosphere as well as upholding an ethos of good moral values. The study found that parent and community involvement in a school’s activities offers various benefits to all stakeholders.
- Full Text:
- Date Issued: 2015
- Authors: Cloete, Jacqueline
- Date: 2015
- Subjects: Education -- Parent participation , Community and school , Home and school
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/8735 , vital:26425
- Description: This study examines the phenomenon of parental and community involvement in a primary school and the benefits thereof to the learners, teachers and community members. The aim of this study is to investigate how a positive school climate can improve the involvement of parents and community members in a school’s activities. The research attempted to determine what the role of a positive school climate is; the strategies schools could apply to enhance parental and community involvement, the possible benefits of involvement and reasons for non-involvement of parents and community members in school activities. The theoretical frameworks of Urie Bronfenbrenner’s ecological model and Joyce Epstein’s overlapping spheres of influence were used in the study. A case study was used as the qualitative research methodology. The data for the research was gathered from a purposive sample of teachers, community volunteer workers, parents and the principal. Semi-structured interview schedules and pre-designed questionnaires including open and closed questions, were used to collect data. The data was analysed inductively by using a descriptive open coding method to identify emerging themes. The findings of the research suggest that a positive school climate to improve parent and community involvement can be created by applying the strategies of effective communication, good working relationships, creating opportunities for involvement, ensuring a healthy and safe environment, formulating a school policy for parent and community involvement, creating a friendly and welcoming atmosphere as well as upholding an ethos of good moral values. The study found that parent and community involvement in a school’s activities offers various benefits to all stakeholders.
- Full Text:
- Date Issued: 2015