Construction project manager health and safety interventions towards improving workers' performance
- Authors: Ayessaki, Winn-Yam Houdou
- Date: 2016
- Subjects: Construction industry -- Management -- Health aspects Construction workers -- Health aspects -- South Africa Construction workers -- Safety measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/12275 , vital:27050
- Description: Optimum construction worker (CW) performance is required to achieve project delivery within project parameters. It is not always the case as CWs are regularly exposed to hazards, involved in accidents, their productivity is poor, they suffer from ill health, suffer from work-related musculoskeletal disorders (WMSDs) and contractors lack resources to allocate towards H&S. However, the lack or the absence of health and safety (H&S) measures, which the aforementioned depend on, has a negative impact on workers’ performance. Two descriptive surveys were conducted among professional construction project managers (CPMs) registered with the South African Council for Project and Construction Management Professions (SACPCMP) and general contractors (GCs) registered with the East Cape Master Builders Association (ECMBA). Interviews were also conducted with CPMs registered with the SACPCMP residing in the Nelson Mandela Bay metropolitan area. The salient findings include: • Accidents, which occur on construction sites, impact workers’ performance; • Inadequate H&S implementation affects both CW skills and motivation, which in turn affects their performance; • Poor constructability is relevant to H&S and CWs’ skills; • Provision and maintenance of welfare facilities are commonly inadequate and affect workers’ performance, and • Projects do not benefit from the adequate financial provision for H&S. It was concluded that exposure to hazards, poor site conditions, inadequate provision of welfare facilities, WMSDs, and insufficient financial provision for H&S affect workers’ performance by either incapacitating or demotivating them. Recommendations include : CPMs should make better use of their influence on clients; they should improve communication channels between project stakeholders; legislators need to raise awareness regarding H&S and worker welfare, and training and education institutions need to empower workers and professionals with H&S knowledge.
- Full Text:
- Date Issued: 2016
- Authors: Ayessaki, Winn-Yam Houdou
- Date: 2016
- Subjects: Construction industry -- Management -- Health aspects Construction workers -- Health aspects -- South Africa Construction workers -- Safety measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/12275 , vital:27050
- Description: Optimum construction worker (CW) performance is required to achieve project delivery within project parameters. It is not always the case as CWs are regularly exposed to hazards, involved in accidents, their productivity is poor, they suffer from ill health, suffer from work-related musculoskeletal disorders (WMSDs) and contractors lack resources to allocate towards H&S. However, the lack or the absence of health and safety (H&S) measures, which the aforementioned depend on, has a negative impact on workers’ performance. Two descriptive surveys were conducted among professional construction project managers (CPMs) registered with the South African Council for Project and Construction Management Professions (SACPCMP) and general contractors (GCs) registered with the East Cape Master Builders Association (ECMBA). Interviews were also conducted with CPMs registered with the SACPCMP residing in the Nelson Mandela Bay metropolitan area. The salient findings include: • Accidents, which occur on construction sites, impact workers’ performance; • Inadequate H&S implementation affects both CW skills and motivation, which in turn affects their performance; • Poor constructability is relevant to H&S and CWs’ skills; • Provision and maintenance of welfare facilities are commonly inadequate and affect workers’ performance, and • Projects do not benefit from the adequate financial provision for H&S. It was concluded that exposure to hazards, poor site conditions, inadequate provision of welfare facilities, WMSDs, and insufficient financial provision for H&S affect workers’ performance by either incapacitating or demotivating them. Recommendations include : CPMs should make better use of their influence on clients; they should improve communication channels between project stakeholders; legislators need to raise awareness regarding H&S and worker welfare, and training and education institutions need to empower workers and professionals with H&S knowledge.
- Full Text:
- Date Issued: 2016
Construction small and medium enterprise development
- Authors: Mbambe, Putumani
- Date: 2016
- Subjects: Construction industry -- Management Small business -- South Africa -- Port Elizabeth Building -- Development
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/11681 , vital:26950
- Description: The objective of this treatise study was to determine the leading causes which limit the development of SMME contractors, to ascertain the accessibility of SMME incubators available to support SMME development and to identify the cause of poor management performance by SMME contractors based in the Nelson Mandela Bay Metropolitan Municipality. A qualitative method was adopted for this study. The primary data was collected using a structured interview guide which incorporated the sub problems and the research questions. The salient findings of this study are: SMME contractors are unaware of the available business information and government support programmes designed to assist them; SMME contractors do not receive capital from banks when they don‟t have collateral; Desperation to secure projects among SMME contractors is the leading cause for under-pricing; SMME contractors are still paid later than the 30 day period for completed work; SMME owners who had started their construction companies lacked training and do not have the relevant experience and knowledge required to manage a construction company. In summary the study concluded that SMME who have access to capital have high growth prospects than those that have not. Accessibility to information and awareness of available opportunities remains significant for the growth of SMMEs. Construction related knowledge and training for SMME owners contributes vastly to the success of SMME companies. The study recommended that; Government needs to promote the accessibility of SMME incubators and ensure institutions designed to assist SMMEs with finance are accessible; The effectiveness of current development programs for small enterprises and skills development programs should be reviewed; MMBM should setup a mentoring program to help train SMME contractors theoretically and practically; NMBM local government should promote women to own SMMEs in order to close the gap of inequality in the built environment; Banks must work with government institutions to ensure that they are able to fund SMMEs.
- Full Text:
- Date Issued: 2016
- Authors: Mbambe, Putumani
- Date: 2016
- Subjects: Construction industry -- Management Small business -- South Africa -- Port Elizabeth Building -- Development
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/11681 , vital:26950
- Description: The objective of this treatise study was to determine the leading causes which limit the development of SMME contractors, to ascertain the accessibility of SMME incubators available to support SMME development and to identify the cause of poor management performance by SMME contractors based in the Nelson Mandela Bay Metropolitan Municipality. A qualitative method was adopted for this study. The primary data was collected using a structured interview guide which incorporated the sub problems and the research questions. The salient findings of this study are: SMME contractors are unaware of the available business information and government support programmes designed to assist them; SMME contractors do not receive capital from banks when they don‟t have collateral; Desperation to secure projects among SMME contractors is the leading cause for under-pricing; SMME contractors are still paid later than the 30 day period for completed work; SMME owners who had started their construction companies lacked training and do not have the relevant experience and knowledge required to manage a construction company. In summary the study concluded that SMME who have access to capital have high growth prospects than those that have not. Accessibility to information and awareness of available opportunities remains significant for the growth of SMMEs. Construction related knowledge and training for SMME owners contributes vastly to the success of SMME companies. The study recommended that; Government needs to promote the accessibility of SMME incubators and ensure institutions designed to assist SMMEs with finance are accessible; The effectiveness of current development programs for small enterprises and skills development programs should be reviewed; MMBM should setup a mentoring program to help train SMME contractors theoretically and practically; NMBM local government should promote women to own SMMEs in order to close the gap of inequality in the built environment; Banks must work with government institutions to ensure that they are able to fund SMMEs.
- Full Text:
- Date Issued: 2016
Consumer decision-making processes for scholar transportation in South African cities: the case of Johannesburg and Pretoria
- Authors: Letsholonyane, Nelly
- Date: 2016
- Subjects: Consumer behavior -- South Africa -- Johannesburg Consumer behavior -- South Africa -- Pretoria
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/13283 , vital:27171
- Description: Scholar transport in South Africa remains an area that needs to be addressed in the interest of all communities, rich and poor alike. The National Development Plan 2030, provides a clarion call for nation building to develop highly knowledgeable South African citizens for building innovative capacity for the nation as a whole(NDP, 2014).
- Full Text: false
- Date Issued: 2016
- Authors: Letsholonyane, Nelly
- Date: 2016
- Subjects: Consumer behavior -- South Africa -- Johannesburg Consumer behavior -- South Africa -- Pretoria
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/13283 , vital:27171
- Description: Scholar transport in South Africa remains an area that needs to be addressed in the interest of all communities, rich and poor alike. The National Development Plan 2030, provides a clarion call for nation building to develop highly knowledgeable South African citizens for building innovative capacity for the nation as a whole(NDP, 2014).
- Full Text: false
- Date Issued: 2016
Continuous flow synthesis of silicon compounds as feedstock for solar-grade silicon production
- Authors: Chigondo, Fidelis
- Date: 2016
- Subjects: Silicon -- Synthesis , Homogeneous catalysis
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: http://hdl.handle.net/10948/4529 , vital:20613
- Description: This thesis describes the key steps in the production of high purity (solar-grade) silicon from metallurgical-grade silicon for use in the production of photovoltaic cells as alternative renewable, environmentally benign and cheap energy source. The initial part of the project involves the development and optimization of a small chemical production platform system capable of producing alkoxysilanes from metallurgical-grade silicon as green precursors to solar-grade silicon production. Specifically, the main aim of the study was to synthesize trialkoxysilanes in continuous flow mode, although the synthesis on monosilane was also done in batch mode. The alkoxylation reaction was carried out in a traditional slurry phase batch reactor, packed bed flow tubular reactor and also attempted in a continuous flow falling film tubular reactor. The effect of key parameters which affect the silicon conversion and selectivity for the desired trialkoxysilane were investigated and optimized using ethanol as a reagent model. The synthesis was then extended to the other alcohols namely methanol, n-propanol and n-butanol. Copper catalysts which were tested in the alkoxylation reaction included: CuCl, Cu(OH)2, CuO and CuSO4. CuCl and Cu(OH)2 showed comparable activity in the batch mode but the former was more efficient in the packed bed flow tubular reactor. Cu(OH)2 could be used as a non-halide catalyst but its activity is limited to short reaction cycles (<10 h). The uncatalysed reaction resulted in negligible reaction rates in both types of reactors. High temperature catalyst pre-heating (>500 oC) resulted in a lower rate of reaction and selectivity than when slightly lower temperatures are used (<350 oC) in both reactors, although much difference was noticed in the packed bed flow tubular reactor. Synthesis in the batch reactor needed longer silicon-catalyst activation time, higher pre-heating temperature and higher catalyst amounts as compare to the packed bed flow tubular reactor. Reaction temperature and alcohol flow rate influenced the reaction in both methods. The optimum reaction temperature range and alcohol flow rate was comparable in both reactors (230 to 240 oC) and 0.1mL/min respectively. The effect of alcohol R-group (C1 to C4) on the reaction revealed that conversion and selectivity generally decrease with an increase in carbon chain length in both methods. Ethanol showed highest selectivity (>95% in batch and >97% in flow) and conversion (about 88% in batch and about 64% in flow) as compared to all other alcohols studied showing that it could be the most efficient alkoxylation alcohol for this reaction. Overally, the packed bed flow tubular reactor resulted in higher selectivity to trialkoxysilanes than the batch system. Performing the reaction under pressure resulted in increased conversion but selectivity to the desire trialkoxysilane diminished. Synthesis in a continuous flow falling film tubular reactor was not successful as it resulted in very poor conversion and selectivity. Monosilane was successfully synthesized from the disproportionation of triethoxysilane using homogeneous and heterogeneous catalysts in batch mode. The results obtained from homogeneous catalysis showed that the reaction can be conducted at room temperature. The heterogeneous catalysis method resulted in slow conversion at room temperature but mild heating up to 55 oC greatly improved the reaction. Conducting the reaction under neat conditions produced comparable results to reactions which were carried out using solvents. The disproportionation reaction was best described by the first order kinetic model. The results obtained in this research indicate that the packed bed flow tubular reactor can be utilized with future modifications for continuous flow synthesis of alkoxysilanes as feedstock for the solar-grade silicon production.
- Full Text:
- Date Issued: 2016
- Authors: Chigondo, Fidelis
- Date: 2016
- Subjects: Silicon -- Synthesis , Homogeneous catalysis
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: http://hdl.handle.net/10948/4529 , vital:20613
- Description: This thesis describes the key steps in the production of high purity (solar-grade) silicon from metallurgical-grade silicon for use in the production of photovoltaic cells as alternative renewable, environmentally benign and cheap energy source. The initial part of the project involves the development and optimization of a small chemical production platform system capable of producing alkoxysilanes from metallurgical-grade silicon as green precursors to solar-grade silicon production. Specifically, the main aim of the study was to synthesize trialkoxysilanes in continuous flow mode, although the synthesis on monosilane was also done in batch mode. The alkoxylation reaction was carried out in a traditional slurry phase batch reactor, packed bed flow tubular reactor and also attempted in a continuous flow falling film tubular reactor. The effect of key parameters which affect the silicon conversion and selectivity for the desired trialkoxysilane were investigated and optimized using ethanol as a reagent model. The synthesis was then extended to the other alcohols namely methanol, n-propanol and n-butanol. Copper catalysts which were tested in the alkoxylation reaction included: CuCl, Cu(OH)2, CuO and CuSO4. CuCl and Cu(OH)2 showed comparable activity in the batch mode but the former was more efficient in the packed bed flow tubular reactor. Cu(OH)2 could be used as a non-halide catalyst but its activity is limited to short reaction cycles (<10 h). The uncatalysed reaction resulted in negligible reaction rates in both types of reactors. High temperature catalyst pre-heating (>500 oC) resulted in a lower rate of reaction and selectivity than when slightly lower temperatures are used (<350 oC) in both reactors, although much difference was noticed in the packed bed flow tubular reactor. Synthesis in the batch reactor needed longer silicon-catalyst activation time, higher pre-heating temperature and higher catalyst amounts as compare to the packed bed flow tubular reactor. Reaction temperature and alcohol flow rate influenced the reaction in both methods. The optimum reaction temperature range and alcohol flow rate was comparable in both reactors (230 to 240 oC) and 0.1mL/min respectively. The effect of alcohol R-group (C1 to C4) on the reaction revealed that conversion and selectivity generally decrease with an increase in carbon chain length in both methods. Ethanol showed highest selectivity (>95% in batch and >97% in flow) and conversion (about 88% in batch and about 64% in flow) as compared to all other alcohols studied showing that it could be the most efficient alkoxylation alcohol for this reaction. Overally, the packed bed flow tubular reactor resulted in higher selectivity to trialkoxysilanes than the batch system. Performing the reaction under pressure resulted in increased conversion but selectivity to the desire trialkoxysilane diminished. Synthesis in a continuous flow falling film tubular reactor was not successful as it resulted in very poor conversion and selectivity. Monosilane was successfully synthesized from the disproportionation of triethoxysilane using homogeneous and heterogeneous catalysts in batch mode. The results obtained from homogeneous catalysis showed that the reaction can be conducted at room temperature. The heterogeneous catalysis method resulted in slow conversion at room temperature but mild heating up to 55 oC greatly improved the reaction. Conducting the reaction under neat conditions produced comparable results to reactions which were carried out using solvents. The disproportionation reaction was best described by the first order kinetic model. The results obtained in this research indicate that the packed bed flow tubular reactor can be utilized with future modifications for continuous flow synthesis of alkoxysilanes as feedstock for the solar-grade silicon production.
- Full Text:
- Date Issued: 2016
Critical success factors affecting an entrepreneurial culture within black African communities in South Africa
- Mwelase, Mfanufikile Khethabahle
- Authors: Mwelase, Mfanufikile Khethabahle
- Date: 2016
- Subjects: Entrepreneurship -- South Africa New business enterprises -- South Africa Small business -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/11659 , vital:26948
- Description: South Africa is faced with many mutually reinforcing societal challenges which include, amongst others, a high rate of unemployment, poverty and inequality. The community that is mostly affected by these challenges is the black African community. In order to deal with the challenge of poverty and inequality which causes other societal problems, entrepreneurship and enterprise development becomes the answer. This view is supported by the body of knowledge available on the subject of entrepreneurship and enterprise development. This paper undertakes to understand critical success factors affecting entrepreneurial culture within black African communities in South Africa. In addition, this paper undertakes to investigate the perceived influence of education and training, access to funding, government policies (i.e. regulatory environment), government programmes, commercial and financial infrastructure, physical infrastructure, crime, corruption and social and cultural norms on the success of entrepreneurial culture development within black African communities. Propositions are made and tested through conducting in-depth interviews with individuals involved with the dynamics presented by this subject on a day to day basis. Evidence collected is interpreted into knowledge and finally recommendations are made.
- Full Text:
- Date Issued: 2016
- Authors: Mwelase, Mfanufikile Khethabahle
- Date: 2016
- Subjects: Entrepreneurship -- South Africa New business enterprises -- South Africa Small business -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/11659 , vital:26948
- Description: South Africa is faced with many mutually reinforcing societal challenges which include, amongst others, a high rate of unemployment, poverty and inequality. The community that is mostly affected by these challenges is the black African community. In order to deal with the challenge of poverty and inequality which causes other societal problems, entrepreneurship and enterprise development becomes the answer. This view is supported by the body of knowledge available on the subject of entrepreneurship and enterprise development. This paper undertakes to understand critical success factors affecting entrepreneurial culture within black African communities in South Africa. In addition, this paper undertakes to investigate the perceived influence of education and training, access to funding, government policies (i.e. regulatory environment), government programmes, commercial and financial infrastructure, physical infrastructure, crime, corruption and social and cultural norms on the success of entrepreneurial culture development within black African communities. Propositions are made and tested through conducting in-depth interviews with individuals involved with the dynamics presented by this subject on a day to day basis. Evidence collected is interpreted into knowledge and finally recommendations are made.
- Full Text:
- Date Issued: 2016
Critical success factors of information security projects
- Authors: Tshabalala, Obediant
- Date: 2016
- Subjects: Management information systems Business enterprises -- Computer networks -- Security measures Information technology projects -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/10397 , vital:26746
- Description: The research shows the critical success factors when implementing information security projects. Many Information security projects in the past have not been successful because these factors were not identified and emphasised effectively. By identifying these factors the research basically presents a model by which information security projects can be executed with guaranteed success. The factors identified during the study cover the following streams: top management commitment as a factor of success; accountability as a factor of success; responsibility as a factor of success; awareness as a factor of success and an information security policy as a factor of success. For the empirical study, a physical questionnaire was administrated to a pool of experts in project management and information security. The study consisted of 60 participants who were verified to have minimum requirements core for questionnaire completion. The questionnaire requested for biological information of the participants and their perceived relations (based on their experience) between project success versus accountability, information security project success versus responsibilities, information security project success versus training & awareness, information security project success versus top management commitment and information security project success versus information security policy. The participants’ responses were structured according to a Likert-type scale. Participants had to indicate the extent to which they agreed with each of the statements in the questionnaire. The responses obtained from the survey were presented and analysed. The researcher observed in this study that information security projects are so specific that critical success factors need to be emphasised from project inception. With the identified critical success factors, the researcher recommends that a project methodology be structured to include these factors so that there is a standard in running information security projects successfully. The researcher also identified that amongst the critical success factors identified, there are some that need to be emphasised more than the others due to their level of importance in such projects.
- Full Text:
- Date Issued: 2016
- Authors: Tshabalala, Obediant
- Date: 2016
- Subjects: Management information systems Business enterprises -- Computer networks -- Security measures Information technology projects -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/10397 , vital:26746
- Description: The research shows the critical success factors when implementing information security projects. Many Information security projects in the past have not been successful because these factors were not identified and emphasised effectively. By identifying these factors the research basically presents a model by which information security projects can be executed with guaranteed success. The factors identified during the study cover the following streams: top management commitment as a factor of success; accountability as a factor of success; responsibility as a factor of success; awareness as a factor of success and an information security policy as a factor of success. For the empirical study, a physical questionnaire was administrated to a pool of experts in project management and information security. The study consisted of 60 participants who were verified to have minimum requirements core for questionnaire completion. The questionnaire requested for biological information of the participants and their perceived relations (based on their experience) between project success versus accountability, information security project success versus responsibilities, information security project success versus training & awareness, information security project success versus top management commitment and information security project success versus information security policy. The participants’ responses were structured according to a Likert-type scale. Participants had to indicate the extent to which they agreed with each of the statements in the questionnaire. The responses obtained from the survey were presented and analysed. The researcher observed in this study that information security projects are so specific that critical success factors need to be emphasised from project inception. With the identified critical success factors, the researcher recommends that a project methodology be structured to include these factors so that there is a standard in running information security projects successfully. The researcher also identified that amongst the critical success factors identified, there are some that need to be emphasised more than the others due to their level of importance in such projects.
- Full Text:
- Date Issued: 2016
Crop yields from organic and conventional farming systems in South Africa's Southern Cape
- Authors: Mashele, N'wa-Jama
- Date: 2016
- Subjects: Organic farming -- South Africa Sustainable agriculture -- South Africa Agricultural systems -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/11637 , vital:26946
- Description: South Africa (SA) is food secure on a national level, however citizens in rural and marginalised areas face household food insecurity due to lack of access to this food. South Africa has low fertility soils and scarce water resources. Climate change reports of unpredictable weather conditions will further exacerbate these challenges. The majority of the agricultural production methods in SA are industrialised and rely heavily on external inputs. Alternative agricultural production methods which are environmentally less taxing, are affordable and yield nutritious food, need to be investigated and adopted. A long-term trial investigating the differences in yields between conventional and organic farming systems was established at the NMMU George Saasveld campus. A baseline study preceded the cropping seasons to establish pre-treatment soil conditions before the two farming systems were be implemented. The trial was a randomized complete block design split into organic, conventional and control plots. In the first cropping season (summer) three crops cabbage (Brassica oleracea var. capitata), sweet potato (Ipomea batatas) and cowpea (vigna ungucuilata) were planted under the different treatments. Soil fertility changes after application of chemical and organic fertilizer were measured. Soil pH and phosphorus increased whilst potassium and soil carbon decreased from baseline levels. The organic plots were found to have higher soil pH, potassium and carbon, whilst P was higher in the conventional plots. The organic cabbages had a yield 12% lower than conventional cabbages, organic cowpeas were 51% lower than conventional cowpeas. Baboons damaged sweet potato plots before maturity. Broccoli (Brassica oleracea var. italica), radish (Raphanus sativa) and green pea (Pisum sativum) were planted in the second cropping season (winter). Organic broccoli yields were 51% lower than conventional broccoli, organic green peas were 18 % lower than conventional green peas. The organic radish yields were 36% lower than conventional yields and this was statically significant. The yield differences were statically significant between control and conventional cabbages (25%) and broccolis (68%). The results indicate that there is on average an initial 25% yield difference between organic and conventional farming systems. Similar studies have shown that the yield gap can be reduced within three to four years. This study presents preliminary results of trials that are to continue for ten years, during which time the yield differences may vary.
- Full Text:
- Date Issued: 2016
- Authors: Mashele, N'wa-Jama
- Date: 2016
- Subjects: Organic farming -- South Africa Sustainable agriculture -- South Africa Agricultural systems -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/11637 , vital:26946
- Description: South Africa (SA) is food secure on a national level, however citizens in rural and marginalised areas face household food insecurity due to lack of access to this food. South Africa has low fertility soils and scarce water resources. Climate change reports of unpredictable weather conditions will further exacerbate these challenges. The majority of the agricultural production methods in SA are industrialised and rely heavily on external inputs. Alternative agricultural production methods which are environmentally less taxing, are affordable and yield nutritious food, need to be investigated and adopted. A long-term trial investigating the differences in yields between conventional and organic farming systems was established at the NMMU George Saasveld campus. A baseline study preceded the cropping seasons to establish pre-treatment soil conditions before the two farming systems were be implemented. The trial was a randomized complete block design split into organic, conventional and control plots. In the first cropping season (summer) three crops cabbage (Brassica oleracea var. capitata), sweet potato (Ipomea batatas) and cowpea (vigna ungucuilata) were planted under the different treatments. Soil fertility changes after application of chemical and organic fertilizer were measured. Soil pH and phosphorus increased whilst potassium and soil carbon decreased from baseline levels. The organic plots were found to have higher soil pH, potassium and carbon, whilst P was higher in the conventional plots. The organic cabbages had a yield 12% lower than conventional cabbages, organic cowpeas were 51% lower than conventional cowpeas. Baboons damaged sweet potato plots before maturity. Broccoli (Brassica oleracea var. italica), radish (Raphanus sativa) and green pea (Pisum sativum) were planted in the second cropping season (winter). Organic broccoli yields were 51% lower than conventional broccoli, organic green peas were 18 % lower than conventional green peas. The organic radish yields were 36% lower than conventional yields and this was statically significant. The yield differences were statically significant between control and conventional cabbages (25%) and broccolis (68%). The results indicate that there is on average an initial 25% yield difference between organic and conventional farming systems. Similar studies have shown that the yield gap can be reduced within three to four years. This study presents preliminary results of trials that are to continue for ten years, during which time the yield differences may vary.
- Full Text:
- Date Issued: 2016
Cultural events hosted in Nelson Mandela Bay
- Boucher, Sasha Marilyn, Calitz, André
- Authors: Boucher, Sasha Marilyn , Calitz, André
- Date: 2016
- Subjects: Heritage tourism Special events -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/11823 , vital:26976
- Description: Purpose – This study seeks to explore residents’ attitudes towards cultural events in Nelson Mandela Bay (NMB), South Africa. The study further discusses the cultural values and social realities of the diverse socio-economic landscape inherent to the city. Equally, the extent of stakeholder involvement has been reflected throughout the study as an indispensable requirement towards sustainable tourism in the city. The study presents that customising cultural events according to the cross-cultural typology has far-reaching consequences in enhancing the image of NMB and induces stakeholder engagement. This study is based on the notion of Social Capital and Stakeholder theory and draws on the multi-cultural phenomenon as the thrust of the study is based on attracting residents’ to cultural events. The literature study indicated that the concept of Social Capital and stakeholder collaboration are mutually exclusive and empirical analysis indicates a strong relationship between the factors relative to residents’ attitudes. Design/Methodology/Approach – This study is located in the positivism paradigm and comprises literature and exploratory research to examine the supposition between the independent variables and the attitudes of residents’ in the NMB. The independent variables underlined in the proposed model are embedded in the literature undertaken. Equally, the thrust of the study is underpinned in Social Capital theory and the Stakeholder theory and is evident throughout this study. In this study, the convenience sampling and snowball sampling methods were employed to obtain a representative sample of residents from the NMB. A questionnaire was used in this study to solicit responses pertaining to the biographical information and questions relating to the factors of perceived satisfaction of residents in the NMB in relation to cultural events. A total number of 3,659 residents participated in this study. The researcher conducted this study by means of testing the constructs of the measuring instrument employed, as well as providing a causal model of relationships between the independent variables and the residents’ attitudes of cultural events in NMB. Findings – The results confirm the reliability and validity of the scales tested on a sample of 3,659 residents, collected using the questionnaire in Nelson Mandela Bay Metropolitan area. The empirical analysis indicates relationships among the independent factors; Social Capital and Stakeholder Profile, where a Pearson’s correlation of 0.50 exists. Furthermore, descriptive findings indicate that there is an overall positive tendency in attitudes for cultural events in the city. The practical significance as identified in the Cohen’s d test for significance infers that the moderating factors in the conceptual model prove that age, area code, home language, ethnicity and home language exert influence in determining residents’ attitudes in the city. Practical Implications – This study identifies the importance of leveraging the cross-cultural typology underscored the Stakeholder theory. Equally, for destination marketing organisations (DMOs) this study can glean insights in respect of the profile of residents for cultural event marketing and their response as stakeholders in the organisation of a cultural event. Social Implications – This study aims to gain a better understanding of the residents’ attitudes of the cultural events hosted by the NMB, its Social Capital and its relationship with varying demographic niches and cultural-centric insights that align to the ideologies pertaining to global citizenship. Originality/Value – This present study makes a contribution to the theories of Social Capital and Stakeholder theory by investigating its roles in determining residents’ attitudes of cultural events in a city. Moreover, it discusses the role of the factors as inducing variables for residents’ motivation by employing marketing principles related to the unique and emotional selling proposition philosophy. Equally, the study espouses the significance of promoting cultural events to extent that it acts as a platform to promote socio-economic development; employment opportunities, improved living standards, improving city infrastructure and environmental protection of a destination and justifies the expedition of Social Capital on the attitudes of residents’.
- Full Text:
- Date Issued: 2016
- Authors: Boucher, Sasha Marilyn , Calitz, André
- Date: 2016
- Subjects: Heritage tourism Special events -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/11823 , vital:26976
- Description: Purpose – This study seeks to explore residents’ attitudes towards cultural events in Nelson Mandela Bay (NMB), South Africa. The study further discusses the cultural values and social realities of the diverse socio-economic landscape inherent to the city. Equally, the extent of stakeholder involvement has been reflected throughout the study as an indispensable requirement towards sustainable tourism in the city. The study presents that customising cultural events according to the cross-cultural typology has far-reaching consequences in enhancing the image of NMB and induces stakeholder engagement. This study is based on the notion of Social Capital and Stakeholder theory and draws on the multi-cultural phenomenon as the thrust of the study is based on attracting residents’ to cultural events. The literature study indicated that the concept of Social Capital and stakeholder collaboration are mutually exclusive and empirical analysis indicates a strong relationship between the factors relative to residents’ attitudes. Design/Methodology/Approach – This study is located in the positivism paradigm and comprises literature and exploratory research to examine the supposition between the independent variables and the attitudes of residents’ in the NMB. The independent variables underlined in the proposed model are embedded in the literature undertaken. Equally, the thrust of the study is underpinned in Social Capital theory and the Stakeholder theory and is evident throughout this study. In this study, the convenience sampling and snowball sampling methods were employed to obtain a representative sample of residents from the NMB. A questionnaire was used in this study to solicit responses pertaining to the biographical information and questions relating to the factors of perceived satisfaction of residents in the NMB in relation to cultural events. A total number of 3,659 residents participated in this study. The researcher conducted this study by means of testing the constructs of the measuring instrument employed, as well as providing a causal model of relationships between the independent variables and the residents’ attitudes of cultural events in NMB. Findings – The results confirm the reliability and validity of the scales tested on a sample of 3,659 residents, collected using the questionnaire in Nelson Mandela Bay Metropolitan area. The empirical analysis indicates relationships among the independent factors; Social Capital and Stakeholder Profile, where a Pearson’s correlation of 0.50 exists. Furthermore, descriptive findings indicate that there is an overall positive tendency in attitudes for cultural events in the city. The practical significance as identified in the Cohen’s d test for significance infers that the moderating factors in the conceptual model prove that age, area code, home language, ethnicity and home language exert influence in determining residents’ attitudes in the city. Practical Implications – This study identifies the importance of leveraging the cross-cultural typology underscored the Stakeholder theory. Equally, for destination marketing organisations (DMOs) this study can glean insights in respect of the profile of residents for cultural event marketing and their response as stakeholders in the organisation of a cultural event. Social Implications – This study aims to gain a better understanding of the residents’ attitudes of the cultural events hosted by the NMB, its Social Capital and its relationship with varying demographic niches and cultural-centric insights that align to the ideologies pertaining to global citizenship. Originality/Value – This present study makes a contribution to the theories of Social Capital and Stakeholder theory by investigating its roles in determining residents’ attitudes of cultural events in a city. Moreover, it discusses the role of the factors as inducing variables for residents’ motivation by employing marketing principles related to the unique and emotional selling proposition philosophy. Equally, the study espouses the significance of promoting cultural events to extent that it acts as a platform to promote socio-economic development; employment opportunities, improved living standards, improving city infrastructure and environmental protection of a destination and justifies the expedition of Social Capital on the attitudes of residents’.
- Full Text:
- Date Issued: 2016
Customer satisfaction with the guesthouse experience in Ghana
- Authors: Amoah, Felix
- Date: 2016
- Subjects: Consumer satisfaction -- Ghana , Hospitality industry -- Ghana -- Management , Tourism -- Ghana -- Marketing
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: http://hdl.handle.net/10948/6073 , vital:21036
- Description: Guesthouse accommodation plays an important role in Ghana’s hospitality industry and was therefore the focus of this study as little research dealing with guesthouses in Ghana could be found. The number of guesthouses in Ghana continues to grow and they thus represent an important alternative to hotels. However, these establishments seem to perform poorly and face several challenges such as lack of managerial knowledge, insufficiently skilled employees, poor interaction with customers, and criticisms of the provision of low quality service. The main reason for undertaking this research was to provide guesthouse managers in Ghana with information that might assist them in making decisions about the experience they offer. Such knowledge could make this type of accommodation more competitive and eventually help the hospitality sector in Ghana attract tourists and grow. It is imperative that guesthouses focus on the experience they offer, because contemporary tourism and hospitality literature suggest that successful businesses require a shift from functional and financial interests to a more profound focus on total experiences which embody emotional aspects. It is thus argued that, if guesthouse managers in Ghana do not know how their guests perceive their guesthouse experience, they might make costly mistakes and allocate resources to aspects that already provide quality and value in a functional sense, instead of those elements perceived as providing quality and value in the total experience. Two dominating concepts, namely experience quality and experience value, formed the basis of the examination of guests’ experience with the guesthouses in Ghana. In addition, the relationships between the experience and satisfaction were also investigated. Four experience quality dimensions, namely hedonics, peace of mind, involvement, and recognition, and seven value dimensions were examined. The experience value dimensions included atmospherics, enjoyment, entertainment, efficiency, excellence, escape, and economic value. A proportional stratified random sampling procedure was followed to select the guesthouses for the study. Thereafter, a structured questionnaire was distributed to the guesthouse guests selected by means of convenience sampling. Five hundred and forty one useable questionnaires were received. The guesthouse guests formed the primary sampling unit for this study. The results of the empirical study showed a strong positive correlation between all the dimensions of experience quality and experience value, while the factor analysis confirmed that all these dimensions loaded on a single factor. Therefore, experience quality and experience value cannot be separated, and the resulting single multi-dimensional factor was subsequently renamed, overall experience. The results also indicated a positive relationship between hedonics, peace of mind, involvement, recognition, atmospherics, enjoyment, entertainment, efficiency, excellence, escape, economic value, and overall satisfaction. The inferentially established rank-order of the dimensions contributing to satisfaction can guide managers when allocating resources. Overall, atmospherics was ranked first, followed by economic value. Escape was the lowest ranked dimension. In addition, it was found that, except for escape, all the experience dimensions were perceived as basic satisfiers. This implies that guests will be dissatisfied when provision of these dimensions is inadequate. With regard to escape, listed as a performance factor, guests will be satisfied when performance is improved and dissatisfied when performance is low. A positive relationship was also found between overall experience and overall satisfaction. The latter include the likelihood of return and recommending the guesthouse to others. Finally, structural equation modelling confirmed a model representing the 11 experience dimensions (hedonics, peace of mind, involvement, recognition, atmospherics, enjoyment, entertainment, escape, efficiency, excellence, and economic value) and the relationships between overall experience and overall satisfaction pertaining to guesthouses in Ghana.
- Full Text:
- Date Issued: 2016
- Authors: Amoah, Felix
- Date: 2016
- Subjects: Consumer satisfaction -- Ghana , Hospitality industry -- Ghana -- Management , Tourism -- Ghana -- Marketing
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: http://hdl.handle.net/10948/6073 , vital:21036
- Description: Guesthouse accommodation plays an important role in Ghana’s hospitality industry and was therefore the focus of this study as little research dealing with guesthouses in Ghana could be found. The number of guesthouses in Ghana continues to grow and they thus represent an important alternative to hotels. However, these establishments seem to perform poorly and face several challenges such as lack of managerial knowledge, insufficiently skilled employees, poor interaction with customers, and criticisms of the provision of low quality service. The main reason for undertaking this research was to provide guesthouse managers in Ghana with information that might assist them in making decisions about the experience they offer. Such knowledge could make this type of accommodation more competitive and eventually help the hospitality sector in Ghana attract tourists and grow. It is imperative that guesthouses focus on the experience they offer, because contemporary tourism and hospitality literature suggest that successful businesses require a shift from functional and financial interests to a more profound focus on total experiences which embody emotional aspects. It is thus argued that, if guesthouse managers in Ghana do not know how their guests perceive their guesthouse experience, they might make costly mistakes and allocate resources to aspects that already provide quality and value in a functional sense, instead of those elements perceived as providing quality and value in the total experience. Two dominating concepts, namely experience quality and experience value, formed the basis of the examination of guests’ experience with the guesthouses in Ghana. In addition, the relationships between the experience and satisfaction were also investigated. Four experience quality dimensions, namely hedonics, peace of mind, involvement, and recognition, and seven value dimensions were examined. The experience value dimensions included atmospherics, enjoyment, entertainment, efficiency, excellence, escape, and economic value. A proportional stratified random sampling procedure was followed to select the guesthouses for the study. Thereafter, a structured questionnaire was distributed to the guesthouse guests selected by means of convenience sampling. Five hundred and forty one useable questionnaires were received. The guesthouse guests formed the primary sampling unit for this study. The results of the empirical study showed a strong positive correlation between all the dimensions of experience quality and experience value, while the factor analysis confirmed that all these dimensions loaded on a single factor. Therefore, experience quality and experience value cannot be separated, and the resulting single multi-dimensional factor was subsequently renamed, overall experience. The results also indicated a positive relationship between hedonics, peace of mind, involvement, recognition, atmospherics, enjoyment, entertainment, efficiency, excellence, escape, economic value, and overall satisfaction. The inferentially established rank-order of the dimensions contributing to satisfaction can guide managers when allocating resources. Overall, atmospherics was ranked first, followed by economic value. Escape was the lowest ranked dimension. In addition, it was found that, except for escape, all the experience dimensions were perceived as basic satisfiers. This implies that guests will be dissatisfied when provision of these dimensions is inadequate. With regard to escape, listed as a performance factor, guests will be satisfied when performance is improved and dissatisfied when performance is low. A positive relationship was also found between overall experience and overall satisfaction. The latter include the likelihood of return and recommending the guesthouse to others. Finally, structural equation modelling confirmed a model representing the 11 experience dimensions (hedonics, peace of mind, involvement, recognition, atmospherics, enjoyment, entertainment, escape, efficiency, excellence, and economic value) and the relationships between overall experience and overall satisfaction pertaining to guesthouses in Ghana.
- Full Text:
- Date Issued: 2016
Dating in the dark: a phenomenological study of the lived experience of online relationships
- Authors: Froneman, Carmen Michelle
- Date: 2016
- Subjects: Online dating , Online dating -- Case studies , Internet -- Social aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/5462 , vital:20847
- Description: Online relationships are becoming increasingly popular due to the availability, accessibility, and affordability of online social networking and dating sites. Individuals are progressively moving from meeting romantic partners face to face to meeting and engaging with individuals online. There is ample evidence to support the view that individuals do initiate romantic relationships online and often these relationships progress offline. The primary focus of online research had been conducted by communication and linguistic scholars while very little research has been conducted into the psychological conceptualisation of online relationships. In addition, there is a lack of available research pertaining to the development of romantic relationships online and more so in South Africa. The current study utilised Sternberg’s Triangular model of love and the Johari window as a framework for understanding the concepts involved in online romantic relationships. The study specifically aimed to explore and describe the lived experiences of individuals who engage in online dating. The parameters of the study included the elements that comprise the online relationship, the subjective meaning attached to the relationships, and the processes these relationships encompass. The study moreover aimed to explore the progression of the online relationship. The study used a qualitative, phenomenological approach using snowball sampling and semi structured interviews to collect data. Tesch’s model of content analysis was used during data analysis while incorporating the four major processes in phenomenological research, namely (1) epoche, (2) phenomenological reduction, (3) imaginative variation and, (4) synthesis. The findings of the study generated a greater understanding of the complexities of online dating. Themes including online relationship development, the dynamics of online relationships, how love, according to the triangular model of love, is perceived online and, self-disclosure online were identified through the participants narratives. These findings ultimately can be used for future research.
- Full Text:
- Date Issued: 2016
- Authors: Froneman, Carmen Michelle
- Date: 2016
- Subjects: Online dating , Online dating -- Case studies , Internet -- Social aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/5462 , vital:20847
- Description: Online relationships are becoming increasingly popular due to the availability, accessibility, and affordability of online social networking and dating sites. Individuals are progressively moving from meeting romantic partners face to face to meeting and engaging with individuals online. There is ample evidence to support the view that individuals do initiate romantic relationships online and often these relationships progress offline. The primary focus of online research had been conducted by communication and linguistic scholars while very little research has been conducted into the psychological conceptualisation of online relationships. In addition, there is a lack of available research pertaining to the development of romantic relationships online and more so in South Africa. The current study utilised Sternberg’s Triangular model of love and the Johari window as a framework for understanding the concepts involved in online romantic relationships. The study specifically aimed to explore and describe the lived experiences of individuals who engage in online dating. The parameters of the study included the elements that comprise the online relationship, the subjective meaning attached to the relationships, and the processes these relationships encompass. The study moreover aimed to explore the progression of the online relationship. The study used a qualitative, phenomenological approach using snowball sampling and semi structured interviews to collect data. Tesch’s model of content analysis was used during data analysis while incorporating the four major processes in phenomenological research, namely (1) epoche, (2) phenomenological reduction, (3) imaginative variation and, (4) synthesis. The findings of the study generated a greater understanding of the complexities of online dating. Themes including online relationship development, the dynamics of online relationships, how love, according to the triangular model of love, is perceived online and, self-disclosure online were identified through the participants narratives. These findings ultimately can be used for future research.
- Full Text:
- Date Issued: 2016
Designing a proxemic natural user interface to support information sharing among co-located mobile devices
- Authors: Lee Son, Timothy
- Date: 2016
- Subjects: User interfaces (Computer systems) Mobile computing
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/12845 , vital:27126
- Description: Existing information sharing methods used by mobile devices require the user to repeat a series of steps to share one or more selected files with another individual, where the entire process is repeated for sharing the same file(s) with multiple individuals. Due to constant advancements in mobile computing, mobile devices are able to provide new, more intuitive, and easier solutions to sharing information. Natural User Interfaces (NUIs) primarily focus on the reuse of existing knowledge (from other applications or activities) or human abilities (such as touch, speech, and gestures) to provide a more accurate and usable solution to existing human computer interaction (HCI) systems. The interaction techniques of NUIs have transformed these human abilities. The main research objective was to design a proxemic NUI to provide an accurate and usable solution to support information sharing among co-located mobile devices. The development of MotionShare supported multiple devices to share information simultaneously using NUI interaction techniques. An initial calibration setup allowed MotionShare to calculate the approximate positions and orientations of every device in the environment. Novel NUI interaction techniques were implemented because of the known positions of these devices. MotionShare was evaluated using two evaluation techniques, namely analytical and experimental. The results showed device positioning to have a mean precision, trueness, and recall of 72.21%, 91.39%, and 71.63% respectively. The results showed MotionShare gestures to have a recall of 90.50% and 100.00% for the point gesture and the touch gesture respectively. The experimental technique consisted of a pilot study (formative evaluation) and a usability evaluation (summative evaluation). The results of the usability evaluation showed high user satisfaction and statistical analysis, which revealed MotionShare to achieve the main research objective. These results also showed that participants preferred the touch gesture to the point gesture, but expressed both gestures can be utilised for the tasks of MotionShare.
- Full Text:
- Date Issued: 2016
- Authors: Lee Son, Timothy
- Date: 2016
- Subjects: User interfaces (Computer systems) Mobile computing
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/12845 , vital:27126
- Description: Existing information sharing methods used by mobile devices require the user to repeat a series of steps to share one or more selected files with another individual, where the entire process is repeated for sharing the same file(s) with multiple individuals. Due to constant advancements in mobile computing, mobile devices are able to provide new, more intuitive, and easier solutions to sharing information. Natural User Interfaces (NUIs) primarily focus on the reuse of existing knowledge (from other applications or activities) or human abilities (such as touch, speech, and gestures) to provide a more accurate and usable solution to existing human computer interaction (HCI) systems. The interaction techniques of NUIs have transformed these human abilities. The main research objective was to design a proxemic NUI to provide an accurate and usable solution to support information sharing among co-located mobile devices. The development of MotionShare supported multiple devices to share information simultaneously using NUI interaction techniques. An initial calibration setup allowed MotionShare to calculate the approximate positions and orientations of every device in the environment. Novel NUI interaction techniques were implemented because of the known positions of these devices. MotionShare was evaluated using two evaluation techniques, namely analytical and experimental. The results showed device positioning to have a mean precision, trueness, and recall of 72.21%, 91.39%, and 71.63% respectively. The results showed MotionShare gestures to have a recall of 90.50% and 100.00% for the point gesture and the touch gesture respectively. The experimental technique consisted of a pilot study (formative evaluation) and a usability evaluation (summative evaluation). The results of the usability evaluation showed high user satisfaction and statistical analysis, which revealed MotionShare to achieve the main research objective. These results also showed that participants preferred the touch gesture to the point gesture, but expressed both gestures can be utilised for the tasks of MotionShare.
- Full Text:
- Date Issued: 2016
Determinants of economic growth in China: 1978-2013
- Authors: Sipuka, Msingathi
- Date: 2016
- Subjects: China -- Economic conditions -- 1976-2000 , Economic development -- China
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/11181 , vital:26892
- Description: On 1 October 1949, the Communist Party of China under the leadership of Mao Zedong proclaimed the establishment of the People’s Republic of China. Mao was to lead the People’s Republic of China for the next twenty seven years until his death in 1976. During this twenty seven year period under Mao’s leadership the Communist Party of China consolidated its position as the leader of Chinese society and in so doing consolidated communist ideology as the central perspective that guided social and economic planning in China. In 1978, two years after Mao’s death, Deng Xiaping assumed the leadership of the Communist Party of China and this period marked the beginning of far reaching economic and social reforms in China. Over the next thirty years these reforms were to transform China’s economy from the tenth largest to the second largest in the world by the end of 2013. During this period China grew its manufacturing base to the extent that the country has become the world’s largest manufacturer and the world’s leading exporter. This transformation of China’s economy has translated to the country experiencing a period of high levels of economic growth over a sustained period of over 30 years. Estimates suggest that the country’s gross domestic product grew at an average annual rate of nearly 10% over a thirty year period from 1978. These high levels of economic growth have significantly contributed to the overall reduction of poverty levels in the country, with some estimates suggesting that between 300 million to 500 million of the country’s citizens have been lifted out of poverty over a period of thirty years. China’s economic growth has had an impact beyond its own borders, as growth in many developing countries has been inextricably linked to developments in the Chinese economy in particular its demand for raw materials.For developing countries that continue to grapple with high levels of poverty among its citizens, China’s experience of lifting such large numbers of its own citizens out of poverty at the back of high levels of economic growth over a period of thirty years must serve as a basis for some learnings. The primary purpose of this research is aimed at contributing towards building the basis for such learnings, particularly with regards to building an understanding of how China has been able to grow its economy at such high levels over a sustained period of time. This research aims to identify the determinants of China’s growth post 1978. The determinants of growth are studied particularly from 1978 because the year marks the beginning of the period of economic reforms.
- Full Text:
- Date Issued: 2016
- Authors: Sipuka, Msingathi
- Date: 2016
- Subjects: China -- Economic conditions -- 1976-2000 , Economic development -- China
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/11181 , vital:26892
- Description: On 1 October 1949, the Communist Party of China under the leadership of Mao Zedong proclaimed the establishment of the People’s Republic of China. Mao was to lead the People’s Republic of China for the next twenty seven years until his death in 1976. During this twenty seven year period under Mao’s leadership the Communist Party of China consolidated its position as the leader of Chinese society and in so doing consolidated communist ideology as the central perspective that guided social and economic planning in China. In 1978, two years after Mao’s death, Deng Xiaping assumed the leadership of the Communist Party of China and this period marked the beginning of far reaching economic and social reforms in China. Over the next thirty years these reforms were to transform China’s economy from the tenth largest to the second largest in the world by the end of 2013. During this period China grew its manufacturing base to the extent that the country has become the world’s largest manufacturer and the world’s leading exporter. This transformation of China’s economy has translated to the country experiencing a period of high levels of economic growth over a sustained period of over 30 years. Estimates suggest that the country’s gross domestic product grew at an average annual rate of nearly 10% over a thirty year period from 1978. These high levels of economic growth have significantly contributed to the overall reduction of poverty levels in the country, with some estimates suggesting that between 300 million to 500 million of the country’s citizens have been lifted out of poverty over a period of thirty years. China’s economic growth has had an impact beyond its own borders, as growth in many developing countries has been inextricably linked to developments in the Chinese economy in particular its demand for raw materials.For developing countries that continue to grapple with high levels of poverty among its citizens, China’s experience of lifting such large numbers of its own citizens out of poverty at the back of high levels of economic growth over a period of thirty years must serve as a basis for some learnings. The primary purpose of this research is aimed at contributing towards building the basis for such learnings, particularly with regards to building an understanding of how China has been able to grow its economy at such high levels over a sustained period of time. This research aims to identify the determinants of China’s growth post 1978. The determinants of growth are studied particularly from 1978 because the year marks the beginning of the period of economic reforms.
- Full Text:
- Date Issued: 2016
Determinants of economic growth in South Africa: an economic analysis of the Keynesian macroeconomic model
- Authors: Nach, Marida Nephertiti
- Date: 2016
- Subjects: South Africa -- Economic conditions Economic development -- South Africa Finance -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/12459 , vital:27068
- Description: A country’s performance is commonly measured by its Gross Domestic Product (GDP). The Gross Domestic Product in Developing Countries (DCs) can be seen confusing and unbalanced, with regular and unconditional falls and booms. This study aims at examining the factors that affect the Gross Domestic Product (GDP) of Developing Countries (DCs) whereby South Africa is being selected as a representative. An econometric analysis of the Keynesian model is adopted to test the South African Gross Domestic Product (GDP) over a decade (10 years). The methodology conducted uses quarterly time series data from the South African Reserve Bank (SARB) where the South African Gross Domestic Product (GDP) is modelled as a function of consumption expenditure, domestic investment, government spending and export/import of the country. This is in order to determine which of these factors best explain South African economic growth dynamics. The variables in the model are tested for stationary and the result shows that the variables become stationary at 1st difference, except for consumption which become stationary at 2nd difference. The Ordinary Least Squares (OLS) results confirm that consumption, investment, government spending and net export all have a positive impact on Gross Domestic Product (GDP). The findings suggest that the South African Gross Domestic Product is mainly influenced by consumption, followed by investment. In the recommendation context, the study recommends that South Africa should continue to maintain price stability while at the same time endeavour to attract more investment to the country. Moreover, Developing Countries need to maintain a fiscal discipline without necessarily losing sight of the international dynamics. For further areas of studies, the study recommends more analysis on macroeconomic policies that are comprehensive and can cover all aspects related to the Keynesian model of economic growth. Finally, it is necessary to remind that the findings and recommendations drawn from the study are limited to the concept of South Africa and are based only on the results from the empirical analysis conducted.
- Full Text:
- Date Issued: 2016
- Authors: Nach, Marida Nephertiti
- Date: 2016
- Subjects: South Africa -- Economic conditions Economic development -- South Africa Finance -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/12459 , vital:27068
- Description: A country’s performance is commonly measured by its Gross Domestic Product (GDP). The Gross Domestic Product in Developing Countries (DCs) can be seen confusing and unbalanced, with regular and unconditional falls and booms. This study aims at examining the factors that affect the Gross Domestic Product (GDP) of Developing Countries (DCs) whereby South Africa is being selected as a representative. An econometric analysis of the Keynesian model is adopted to test the South African Gross Domestic Product (GDP) over a decade (10 years). The methodology conducted uses quarterly time series data from the South African Reserve Bank (SARB) where the South African Gross Domestic Product (GDP) is modelled as a function of consumption expenditure, domestic investment, government spending and export/import of the country. This is in order to determine which of these factors best explain South African economic growth dynamics. The variables in the model are tested for stationary and the result shows that the variables become stationary at 1st difference, except for consumption which become stationary at 2nd difference. The Ordinary Least Squares (OLS) results confirm that consumption, investment, government spending and net export all have a positive impact on Gross Domestic Product (GDP). The findings suggest that the South African Gross Domestic Product is mainly influenced by consumption, followed by investment. In the recommendation context, the study recommends that South Africa should continue to maintain price stability while at the same time endeavour to attract more investment to the country. Moreover, Developing Countries need to maintain a fiscal discipline without necessarily losing sight of the international dynamics. For further areas of studies, the study recommends more analysis on macroeconomic policies that are comprehensive and can cover all aspects related to the Keynesian model of economic growth. Finally, it is necessary to remind that the findings and recommendations drawn from the study are limited to the concept of South Africa and are based only on the results from the empirical analysis conducted.
- Full Text:
- Date Issued: 2016
Determinants of household savings in South Africa
- Authors: Malindini, Kholiswa
- Date: 2016
- Subjects: Cost and standard of living -- South Africa , Home economics -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/8436 , vital:26356
- Description: This study empirically evaluates the determinant of household savings in South Africa (1985- 2013). The study used co-integration and Vector Error Correction Mechanism to determine the relationship between household savings and the selected explanatory variables. The study made use of a quarterly time series data sets from the SARB quarterly bulletin. The long-run relationship between savings and its determinants was examined using the procedure suggested in the literature by Johansen. The results of the co-integration tests suggest that there is a long-run relationship between savings and household wealth. The results suggest that wealth is a main determinant of household savings in the long run. However, the impulse response function and the variance decomposition indicated that household debt is dominant in explaining the variations in household savings better than other explanatory variables confirm. On the other hand, household debt, household disposable income and cpi (inflation) and interest rates have negative effects on household savings in the long run. Further, the estimated results revealed that disposable income, interest rate and inflation have statistically significant influence on household savings in South Africa. The implication of the results obtained from impulse response and variance decomposition is that South Africa has liberalized its financial sector to a large extent over the past decade such that households are over indebted. The main reasons for the decline in savings in South Africa is easy availability of Credit which encouraged consumers to take out loans, the rising house prices which encouraged consumers to borrow because of their positive wealth effect, Cultural/Social trends encouraging an attitude of borrowing and spending and lastly low interest rates (both in nominal and real terms). To this end, the study suggests that the South African National Credit Regulator conduct a credit audit to spot-check credit providers’ compliance with the provisions on reckless credit and over-indebtedness. More focus should be placed on indirect measures for preventing over-indebtedness, for example education. It is recommended that governmental or private organisations should set up educational programmes to improve information and advice on the risks attached to consumer credit. It is further suggested these programmes focus on money management for use in schools be made compulsory so as to raise awareness levels and establish financial literacy from an early age. This recommendation is based on the principle that prevention is better than cure.
- Full Text:
- Date Issued: 2016
- Authors: Malindini, Kholiswa
- Date: 2016
- Subjects: Cost and standard of living -- South Africa , Home economics -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/8436 , vital:26356
- Description: This study empirically evaluates the determinant of household savings in South Africa (1985- 2013). The study used co-integration and Vector Error Correction Mechanism to determine the relationship between household savings and the selected explanatory variables. The study made use of a quarterly time series data sets from the SARB quarterly bulletin. The long-run relationship between savings and its determinants was examined using the procedure suggested in the literature by Johansen. The results of the co-integration tests suggest that there is a long-run relationship between savings and household wealth. The results suggest that wealth is a main determinant of household savings in the long run. However, the impulse response function and the variance decomposition indicated that household debt is dominant in explaining the variations in household savings better than other explanatory variables confirm. On the other hand, household debt, household disposable income and cpi (inflation) and interest rates have negative effects on household savings in the long run. Further, the estimated results revealed that disposable income, interest rate and inflation have statistically significant influence on household savings in South Africa. The implication of the results obtained from impulse response and variance decomposition is that South Africa has liberalized its financial sector to a large extent over the past decade such that households are over indebted. The main reasons for the decline in savings in South Africa is easy availability of Credit which encouraged consumers to take out loans, the rising house prices which encouraged consumers to borrow because of their positive wealth effect, Cultural/Social trends encouraging an attitude of borrowing and spending and lastly low interest rates (both in nominal and real terms). To this end, the study suggests that the South African National Credit Regulator conduct a credit audit to spot-check credit providers’ compliance with the provisions on reckless credit and over-indebtedness. More focus should be placed on indirect measures for preventing over-indebtedness, for example education. It is recommended that governmental or private organisations should set up educational programmes to improve information and advice on the risks attached to consumer credit. It is further suggested these programmes focus on money management for use in schools be made compulsory so as to raise awareness levels and establish financial literacy from an early age. This recommendation is based on the principle that prevention is better than cure.
- Full Text:
- Date Issued: 2016
Determining budgeting skills of government social grant holders
- Authors: Matanga, Sive
- Date: 2016
- Subjects: Budgets, Personal -- South Africa , Social security -- South Africa Grants-in-aid -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/18454 , vital:28647
- Description: The lack of budgeting skills in Government Social Grant recipients has significantly added to an inability in many of the grant recipients to address the existing poverty in their households. This situation has been exacerbated due to exploitation of social grant recipients by illegal money lenders charging excessively high interest rates trapping grant recipients in a vicious cycle of perpetuating debt. In remote rural areas poverty and lack of literacy and numeracy skills go hand in hand. Psycho-social and economic factors play a role in grant recipients’ poor budgeting and financial decision making skills, contributing to them falling into debt in the first place. Aggravating the situation is legislation that limits access to financial resources of those without employment, rendering illegal money lenders the financial entity providing finance by default. The research was conducted in a poor rural area around Tarkastad, Eastern Cape and sought to identify challenges caused by, amongst others, the lack of decent education, poverty and poor budgeting skills, all negatively influencing different social grant holders. Analysis of data from this qualitative study took place by means of a thematic classification against the background of a critical theoretical framework. The researcher believes that this study shed light on issues surrounding exploitation by illegal, unregistered money lenders and that the suggested recommendations, if implemented, may bring about a change in lending patterns and saving behaviour of communities in remote areas.
- Full Text:
- Date Issued: 2016
- Authors: Matanga, Sive
- Date: 2016
- Subjects: Budgets, Personal -- South Africa , Social security -- South Africa Grants-in-aid -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/18454 , vital:28647
- Description: The lack of budgeting skills in Government Social Grant recipients has significantly added to an inability in many of the grant recipients to address the existing poverty in their households. This situation has been exacerbated due to exploitation of social grant recipients by illegal money lenders charging excessively high interest rates trapping grant recipients in a vicious cycle of perpetuating debt. In remote rural areas poverty and lack of literacy and numeracy skills go hand in hand. Psycho-social and economic factors play a role in grant recipients’ poor budgeting and financial decision making skills, contributing to them falling into debt in the first place. Aggravating the situation is legislation that limits access to financial resources of those without employment, rendering illegal money lenders the financial entity providing finance by default. The research was conducted in a poor rural area around Tarkastad, Eastern Cape and sought to identify challenges caused by, amongst others, the lack of decent education, poverty and poor budgeting skills, all negatively influencing different social grant holders. Analysis of data from this qualitative study took place by means of a thematic classification against the background of a critical theoretical framework. The researcher believes that this study shed light on issues surrounding exploitation by illegal, unregistered money lenders and that the suggested recommendations, if implemented, may bring about a change in lending patterns and saving behaviour of communities in remote areas.
- Full Text:
- Date Issued: 2016
Determining reasonableness in the light of Sidumo
- Govender, Mogisvaree Murugan
- Authors: Govender, Mogisvaree Murugan
- Date: 2016
- Subjects: Labor laws and legislation -- South Africa Employees -- Law and legislation -- South Africa Law -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/11648 , vital:26947
- Description: The primary purpose of this treatise is to consider the development, analysis and application of the review test in relation to arbitration awards which is set out in the Constitutional Court (CC) judgment of Sidumo & Another v Rustenburg Platinum Mines Ltd & Others (Sidumo).1 This judgment has already had significant implications for employers and employees alike and will continue to do so in the future. Many lawyers, trade unions and employees launch or oppose review applications in the Labour Court on behalf of employers or employees. In observing this litigation process, it became clear that practitioners make two fundamental mistakes. Firstly they do not appreciate the distinction between reviews and appeals and / or, secondly, they misconstrue the Sidumo test in seeking to review or defend an arbitration award. This causes serious prejudice to their clients and results in delays in labour dispute resolution which is contrary to the spirit and purpose of the Labour Relations Act,2 as amended (LRA). The application of the Constitution of the Republic of South Africa,3 legislation and case law is fundamental to the review of arbitration awards and the role of arbitrators in that process. The common thread is the notion of “reasonableness” and “fairness” which has been and continues to be of significant importance in the assessment of arbitration awards. During the course of this research paper, reference is been made to the Constitution, legislation, case law, academic papers and journal articles. The references are mostly precedent setting and authoritative in relation to reviewable irregularities in arbitration awards. The purpose of this paper is guide and assist labour court practitioners to analyse arbitration awards and identify reviewable irregularities in order to determine whether it meets the bandwidth of reasonableness within the context of the Constitution and LRA. In doing so, practitioners will be able to successfully review awards without unduly delaying the dispute resolution process. During the research process, one of the important findings was that there has been inconsistent jurisprudence relating to the application of the grounds of review and the review test itself as per Sidumo which blurred the distinction between reviews and appeals. Many review applications failed to attack the reasonableness of the decision of the commissioner, but rather focused on the cogency of the evidence presented at the arbitration and thereby incorrectly invoking an appeal instead of a review. A further challenge was that the jurisprudence created a perception amongst practitioners that there was a decline in the Sidumo test. This approach was inherently incorrect and recent judgments have clarified and upheld the Sidumo test in review applications.4 The recent landmark judgments by the Supreme Court of Appeal (SCA) clarified that reasonableness was not a separate ground of review but was to be suffused with the grounds of review set out in section 145(2)(a) of the LRA.5 Lastly, Sidumo did not postulate the bandwidth of reasonableness and it was left to the courts to determine the extent of judicial interference. There are various factors to be considered and CC judgments have provided much needed guidance on how to determine reasonableness. In essence, a wrong decision per se is not reviewable. At best, erroneous reasons or lack of proper reasons may serve as evidence for a reviewable ground that will together with other considerations require compelling proof to justify a court’s interpretation that the decision reached is not one that a reasonable decision could have reached.7 In order to obtain an award on the basis of the Sidumo test, the 4 Andre Herholdt v Nedbank [2013] 11 BLLR 1075 (SCA); Goldfields Mining South Africa (Pty) Ltd v CCMA [2014] BLLR 20 (LAC). applicant must thus assail not only the commissioner’s reasons, but also the result of the award.
- Full Text:
- Date Issued: 2016
- Authors: Govender, Mogisvaree Murugan
- Date: 2016
- Subjects: Labor laws and legislation -- South Africa Employees -- Law and legislation -- South Africa Law -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/11648 , vital:26947
- Description: The primary purpose of this treatise is to consider the development, analysis and application of the review test in relation to arbitration awards which is set out in the Constitutional Court (CC) judgment of Sidumo & Another v Rustenburg Platinum Mines Ltd & Others (Sidumo).1 This judgment has already had significant implications for employers and employees alike and will continue to do so in the future. Many lawyers, trade unions and employees launch or oppose review applications in the Labour Court on behalf of employers or employees. In observing this litigation process, it became clear that practitioners make two fundamental mistakes. Firstly they do not appreciate the distinction between reviews and appeals and / or, secondly, they misconstrue the Sidumo test in seeking to review or defend an arbitration award. This causes serious prejudice to their clients and results in delays in labour dispute resolution which is contrary to the spirit and purpose of the Labour Relations Act,2 as amended (LRA). The application of the Constitution of the Republic of South Africa,3 legislation and case law is fundamental to the review of arbitration awards and the role of arbitrators in that process. The common thread is the notion of “reasonableness” and “fairness” which has been and continues to be of significant importance in the assessment of arbitration awards. During the course of this research paper, reference is been made to the Constitution, legislation, case law, academic papers and journal articles. The references are mostly precedent setting and authoritative in relation to reviewable irregularities in arbitration awards. The purpose of this paper is guide and assist labour court practitioners to analyse arbitration awards and identify reviewable irregularities in order to determine whether it meets the bandwidth of reasonableness within the context of the Constitution and LRA. In doing so, practitioners will be able to successfully review awards without unduly delaying the dispute resolution process. During the research process, one of the important findings was that there has been inconsistent jurisprudence relating to the application of the grounds of review and the review test itself as per Sidumo which blurred the distinction between reviews and appeals. Many review applications failed to attack the reasonableness of the decision of the commissioner, but rather focused on the cogency of the evidence presented at the arbitration and thereby incorrectly invoking an appeal instead of a review. A further challenge was that the jurisprudence created a perception amongst practitioners that there was a decline in the Sidumo test. This approach was inherently incorrect and recent judgments have clarified and upheld the Sidumo test in review applications.4 The recent landmark judgments by the Supreme Court of Appeal (SCA) clarified that reasonableness was not a separate ground of review but was to be suffused with the grounds of review set out in section 145(2)(a) of the LRA.5 Lastly, Sidumo did not postulate the bandwidth of reasonableness and it was left to the courts to determine the extent of judicial interference. There are various factors to be considered and CC judgments have provided much needed guidance on how to determine reasonableness. In essence, a wrong decision per se is not reviewable. At best, erroneous reasons or lack of proper reasons may serve as evidence for a reviewable ground that will together with other considerations require compelling proof to justify a court’s interpretation that the decision reached is not one that a reasonable decision could have reached.7 In order to obtain an award on the basis of the Sidumo test, the 4 Andre Herholdt v Nedbank [2013] 11 BLLR 1075 (SCA); Goldfields Mining South Africa (Pty) Ltd v CCMA [2014] BLLR 20 (LAC). applicant must thus assail not only the commissioner’s reasons, but also the result of the award.
- Full Text:
- Date Issued: 2016
Development of a small production platform for citronellal processing
- Mafu, Lubabalo Rowan, Zeelie, Ben
- Authors: Mafu, Lubabalo Rowan , Zeelie, Ben
- Date: 2016
- Subjects: Organic compounds -- Synthesis , Plasticizers
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/8488 , vital:26370
- Description: The aim of the project was to develop a small production platform for citronellal processing. The objective of the study was to develop a single continuous flow reactor system for the synthesis of novel derivatives of citronellal and isopulegol. The first step was to develop a continuous flow reactor system for the isopulegol synthesis. The stainless steel tubular fixed-bed reactor equipped with a reaction column (I.D: 9.53 mm and length: 120 mm) was used for the study. The reactor column was packed with H-ZMS-5 zeolite extrusion catalyst. The solvent-free cyclisation reaction of citronellal was investigated and at optimum conditions, 100% of citronellal conversion and almost 100% selectivity towards isopulegol was achieved. A good catalytic performance was observed from the H-ZSM-5 catalyst and proved to be stable for a prolonged reaction time. The second reaction step was to develop a continuous flow reactor system for the synthesis of isopulegyl-ether derivatives. A UniQsis FlowSyn reactor system equipped with a stainless steel reactor column was used for the study. The reactor column was packed with amberlyst-15 dry catalyst. Wherein, n-propanol was employed as a model etherifying agent and as a reaction solvent. At optimum reaction condition, only 30% selectivity of isopulegyl propoxy-ether was achieved. The reaction was found to depend highly on temperature and residence time. The increase of these parameters was found to increase the side reactions and reduced the selectivity of the desired product. Other heterogeneous catalysts such as H-beta zeolite, aluminium pillared clay, Aluminium oxide and H-ZSM-5 were also evaluated in the reaction. Among these catalysts, a catalytic activity was observed with H-beta zeolite (19%) and aluminium pillared clay (5%). Based on these results, none of the evaluated catalysts provided the desired selectivity (greater than 70%) towards the isopulegyl propoxy-ether, therefore the process was not investigated further. In light of this, the isopulegol etherification synthetic route was terminated. Consequently, another analogue of citronellal was used as an alternative intermediate in place of isopulegol, namely para-menthane-3,8-diol (PMD). The initial studies for the synthesis of the novel PMD di-esters from isopulegol were performed in the batch-scale reactor. In a solvent-free reaction, acetic anhydride was initially used as a model acetylating agent. The reaction was performed using polymer-bound scandium triflate (PS-Sc(OTf)3) catalyst. The effect of reaction parameters such as temperature, molar ratio, and reaction time were studied towards the PMD conversion and di-esters selectivity. At optimum reaction conditions, PMD conversion of 70% and di-acetate selectivity of 67% were observed. The reaction was found to follow the zeroth-order kinetics with respect to PMD conversion and obeyed the Arrhenius equation. Other types of di-ester derivatives were synthesized from PMD by varying the carbon chain length of the acetylating agent. The prepared compounds were separated from the product mixtures by vacuum distillation, purified on a column chromatography and characterised by FT-IR, GC-MS, and 1H-NMR, 13C-NMR. The developed methodology was optimised in flow by using an ArrheniumOne microwave-assisted continuous-flow fixed-bed reactor system. A detailed experimental design was used to carry-out the reactions. The reaction parameters such as temperature and flow-rate were studied towards the PMD conversion and di-ester selectivity. From the experimental design analysis, the di-ester selectivity was found to depend highly on the residence time (flow-rate) and significantly on temperature. The PMD conversion and di-ester selectivity were found to increase with decrease in the flow-rate. The conversion and selectivity achieved in the continuous flow process were significantly higher than the achieved in the batch-scale process with respect to the residence time.
- Full Text:
- Date Issued: 2016
- Authors: Mafu, Lubabalo Rowan , Zeelie, Ben
- Date: 2016
- Subjects: Organic compounds -- Synthesis , Plasticizers
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/8488 , vital:26370
- Description: The aim of the project was to develop a small production platform for citronellal processing. The objective of the study was to develop a single continuous flow reactor system for the synthesis of novel derivatives of citronellal and isopulegol. The first step was to develop a continuous flow reactor system for the isopulegol synthesis. The stainless steel tubular fixed-bed reactor equipped with a reaction column (I.D: 9.53 mm and length: 120 mm) was used for the study. The reactor column was packed with H-ZMS-5 zeolite extrusion catalyst. The solvent-free cyclisation reaction of citronellal was investigated and at optimum conditions, 100% of citronellal conversion and almost 100% selectivity towards isopulegol was achieved. A good catalytic performance was observed from the H-ZSM-5 catalyst and proved to be stable for a prolonged reaction time. The second reaction step was to develop a continuous flow reactor system for the synthesis of isopulegyl-ether derivatives. A UniQsis FlowSyn reactor system equipped with a stainless steel reactor column was used for the study. The reactor column was packed with amberlyst-15 dry catalyst. Wherein, n-propanol was employed as a model etherifying agent and as a reaction solvent. At optimum reaction condition, only 30% selectivity of isopulegyl propoxy-ether was achieved. The reaction was found to depend highly on temperature and residence time. The increase of these parameters was found to increase the side reactions and reduced the selectivity of the desired product. Other heterogeneous catalysts such as H-beta zeolite, aluminium pillared clay, Aluminium oxide and H-ZSM-5 were also evaluated in the reaction. Among these catalysts, a catalytic activity was observed with H-beta zeolite (19%) and aluminium pillared clay (5%). Based on these results, none of the evaluated catalysts provided the desired selectivity (greater than 70%) towards the isopulegyl propoxy-ether, therefore the process was not investigated further. In light of this, the isopulegol etherification synthetic route was terminated. Consequently, another analogue of citronellal was used as an alternative intermediate in place of isopulegol, namely para-menthane-3,8-diol (PMD). The initial studies for the synthesis of the novel PMD di-esters from isopulegol were performed in the batch-scale reactor. In a solvent-free reaction, acetic anhydride was initially used as a model acetylating agent. The reaction was performed using polymer-bound scandium triflate (PS-Sc(OTf)3) catalyst. The effect of reaction parameters such as temperature, molar ratio, and reaction time were studied towards the PMD conversion and di-esters selectivity. At optimum reaction conditions, PMD conversion of 70% and di-acetate selectivity of 67% were observed. The reaction was found to follow the zeroth-order kinetics with respect to PMD conversion and obeyed the Arrhenius equation. Other types of di-ester derivatives were synthesized from PMD by varying the carbon chain length of the acetylating agent. The prepared compounds were separated from the product mixtures by vacuum distillation, purified on a column chromatography and characterised by FT-IR, GC-MS, and 1H-NMR, 13C-NMR. The developed methodology was optimised in flow by using an ArrheniumOne microwave-assisted continuous-flow fixed-bed reactor system. A detailed experimental design was used to carry-out the reactions. The reaction parameters such as temperature and flow-rate were studied towards the PMD conversion and di-ester selectivity. From the experimental design analysis, the di-ester selectivity was found to depend highly on the residence time (flow-rate) and significantly on temperature. The PMD conversion and di-ester selectivity were found to increase with decrease in the flow-rate. The conversion and selectivity achieved in the continuous flow process were significantly higher than the achieved in the batch-scale process with respect to the residence time.
- Full Text:
- Date Issued: 2016
Development of aptamers against epitopes of the Ebola virus nucleoprotein for future applications in diagnostics
- Mutombwera , Atherton Tiripano
- Authors: Mutombwera , Atherton Tiripano
- Date: 2016
- Subjects: Ebola virus disease Ebola virus disease -- Treatment , Epidemics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/45931 , vital:39321
- Description: Five different subtypes of the Ebola virus (EBOV) have been described. Either Zaire or Sudan EBOV subtypes has caused all of the EBOV outbreaks to date. The March 2014 Zaire EBOV disease outbreak that ravaged West Africa had a mortality rate of 70%, and resulted in 11 315 deaths. Swift cost effective EBOV detection is required to manage EBOV disease outbreaks as this leads to the interruption of the chain of transmission. Lateral flow diagnostic devices (LFDs) have been designed to provide quick, simple and cost effective diagnosis at the point of care and have great potential at interrupting the chain of EBOV transmission. The target recognition elements used in LFDs are the most important components of an LFD as they determine not only the selectivity and specificity of the device but also the transportation and storage conditions of the devices. Antibodies are the most common biomolecules used as target recognition elements in LFDs. However, the cost of producing antibodies is high and these biomolecules are highly sensitive to changes in the environmental conditions (e.g. temperature, pH and ionic strengths of buffer conditions), which can affect the selectivity and specificity of the LFDs. Aptamers can be used as alternative target recognition elements in LFDs. Aptamers are short single stranded nucleic acid molecules that have the ability to bind to their targets (e.g. whole cells, small molecules, toxins, proteins and peptides) with high affinity and specificity. By replacing antibodies with aptamers, LFDs can be produced that are less expensive, have higher selectivity and specificity. The aim of this study was to generate aptamers against the two highly conserved linear epitope regions (amino acid 421-440 and amino acid 601-620) of the EBOV nuclear protein (NP) using site directed SELEX. Such aptamers can be used as target recognition elements in the development of a LFD for the diagnosis of EBOV infection. Four aptamers that can potentially bind to the linear epitope spanning from amino acid 421 to 440 of the EBOV NP and four aptamers that can potentially bind to the linear epitope spanning from amino acid 601 to 620 of the EBOV NP were identified in this study. An in silico analysis of the predicted secondary structure of the putative aptamers was performed before and after the truncation of nucleotide sequences from the 5’ and 3’ ends of the aptamers to remove excess nucleotide sequences. Although this study did not characterise the interaction between the aptamers and linear epitope regions, the study succeeded in optimising the buffer conditions for future interaction studies using the SPR Biacore 3000 instrument.
- Full Text:
- Date Issued: 2016
- Authors: Mutombwera , Atherton Tiripano
- Date: 2016
- Subjects: Ebola virus disease Ebola virus disease -- Treatment , Epidemics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/45931 , vital:39321
- Description: Five different subtypes of the Ebola virus (EBOV) have been described. Either Zaire or Sudan EBOV subtypes has caused all of the EBOV outbreaks to date. The March 2014 Zaire EBOV disease outbreak that ravaged West Africa had a mortality rate of 70%, and resulted in 11 315 deaths. Swift cost effective EBOV detection is required to manage EBOV disease outbreaks as this leads to the interruption of the chain of transmission. Lateral flow diagnostic devices (LFDs) have been designed to provide quick, simple and cost effective diagnosis at the point of care and have great potential at interrupting the chain of EBOV transmission. The target recognition elements used in LFDs are the most important components of an LFD as they determine not only the selectivity and specificity of the device but also the transportation and storage conditions of the devices. Antibodies are the most common biomolecules used as target recognition elements in LFDs. However, the cost of producing antibodies is high and these biomolecules are highly sensitive to changes in the environmental conditions (e.g. temperature, pH and ionic strengths of buffer conditions), which can affect the selectivity and specificity of the LFDs. Aptamers can be used as alternative target recognition elements in LFDs. Aptamers are short single stranded nucleic acid molecules that have the ability to bind to their targets (e.g. whole cells, small molecules, toxins, proteins and peptides) with high affinity and specificity. By replacing antibodies with aptamers, LFDs can be produced that are less expensive, have higher selectivity and specificity. The aim of this study was to generate aptamers against the two highly conserved linear epitope regions (amino acid 421-440 and amino acid 601-620) of the EBOV nuclear protein (NP) using site directed SELEX. Such aptamers can be used as target recognition elements in the development of a LFD for the diagnosis of EBOV infection. Four aptamers that can potentially bind to the linear epitope spanning from amino acid 421 to 440 of the EBOV NP and four aptamers that can potentially bind to the linear epitope spanning from amino acid 601 to 620 of the EBOV NP were identified in this study. An in silico analysis of the predicted secondary structure of the putative aptamers was performed before and after the truncation of nucleotide sequences from the 5’ and 3’ ends of the aptamers to remove excess nucleotide sequences. Although this study did not characterise the interaction between the aptamers and linear epitope regions, the study succeeded in optimising the buffer conditions for future interaction studies using the SPR Biacore 3000 instrument.
- Full Text:
- Date Issued: 2016
Development of Palladium selective reagents and materials
- Authors: Moyo, Cyprian Bertrand
- Date: 2016
- Subjects: Palladium Palladium compounds -- Industrial applications Chemistry, Inorganic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/12231 , vital:27046
- Description: The adsorption and separation of Pd(II) from Pt(IV), Ir(IV) and Rh(III) by silica microparticles functionalized with triethylenetetramine (TETA), 2-(2-aminoethylthio)ethanamine (NSN) and 2-(2-(2-aminoethyl)ethylthio)ethanamine (NSSN) in 1 M hydrochloric acid medium was investigated by continuous column studies. The functionalized sorbent materials were characterized by microanalysis, SEM-EDS and FT-IR. Palladium selectivity of the sorbent materials was achieved by stripping of rhodium, iridium and platinum chlorido species with 0.5 M of NaClO4 in 1 M HCl while [PdCl4]2 was eluted with 3% w/v thiourea. The desorption efficiency of thiourea was confirmed by the SEM-EDS analysis of the materials after Pd(II) elution. Palladium loading capacity of the sorbents were in the order S-NSSN (23.85 mg/g) > S-NSN (12.70 mg/g) > S-TETA (4.97 mg/g). The extraction patterns on the sorbent materials were explained by considering the coordination chemistry of the ligand with [PdCl4]2ˉ and ionic interactions of [PtCl6]2ˉ and [IrCl5(H2O]ˉ. The square planar complexes, [Pd(HNSSNH)Cl2]Cl2 and [Pd(NSNH)Cl2][PdCl4]2, were isolated, analyzed by spectroscopy and single crystal X-ray, whereas evidence of the fraction of Pd(II)-TETA complex was obtained by HPLC studies. This provided proof of the inner sphere coordination mechanism as the mode of interaction of these ligands with [PdCl4]2ˉ. Trace amounts of Brˉ anions in ligands resulted in the inadvertent isolation of bromide coordinated Pd(II) NSN and NSSN complexes. The ion-pair salts of [TETAH4]4+ with [PtCl6]2ˉ, [IrCl6]3ˉ and [RhCl6]3ˉ were also isolated and characterized by microanalysis and IR to further explain the extraction patterns.
- Full Text:
- Date Issued: 2016
- Authors: Moyo, Cyprian Bertrand
- Date: 2016
- Subjects: Palladium Palladium compounds -- Industrial applications Chemistry, Inorganic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/12231 , vital:27046
- Description: The adsorption and separation of Pd(II) from Pt(IV), Ir(IV) and Rh(III) by silica microparticles functionalized with triethylenetetramine (TETA), 2-(2-aminoethylthio)ethanamine (NSN) and 2-(2-(2-aminoethyl)ethylthio)ethanamine (NSSN) in 1 M hydrochloric acid medium was investigated by continuous column studies. The functionalized sorbent materials were characterized by microanalysis, SEM-EDS and FT-IR. Palladium selectivity of the sorbent materials was achieved by stripping of rhodium, iridium and platinum chlorido species with 0.5 M of NaClO4 in 1 M HCl while [PdCl4]2 was eluted with 3% w/v thiourea. The desorption efficiency of thiourea was confirmed by the SEM-EDS analysis of the materials after Pd(II) elution. Palladium loading capacity of the sorbents were in the order S-NSSN (23.85 mg/g) > S-NSN (12.70 mg/g) > S-TETA (4.97 mg/g). The extraction patterns on the sorbent materials were explained by considering the coordination chemistry of the ligand with [PdCl4]2ˉ and ionic interactions of [PtCl6]2ˉ and [IrCl5(H2O]ˉ. The square planar complexes, [Pd(HNSSNH)Cl2]Cl2 and [Pd(NSNH)Cl2][PdCl4]2, were isolated, analyzed by spectroscopy and single crystal X-ray, whereas evidence of the fraction of Pd(II)-TETA complex was obtained by HPLC studies. This provided proof of the inner sphere coordination mechanism as the mode of interaction of these ligands with [PdCl4]2ˉ. Trace amounts of Brˉ anions in ligands resulted in the inadvertent isolation of bromide coordinated Pd(II) NSN and NSSN complexes. The ion-pair salts of [TETAH4]4+ with [PtCl6]2ˉ, [IrCl6]3ˉ and [RhCl6]3ˉ were also isolated and characterized by microanalysis and IR to further explain the extraction patterns.
- Full Text:
- Date Issued: 2016
Die hantering van etikette in woordeboeke, met spesiale verwysing na Xhosa-woordeboeke
- Landman, Kie-Mari, Kwatsha, Linda Loretta, Otto, PR
- Authors: Landman, Kie-Mari , Kwatsha, Linda Loretta , Otto, PR
- Date: 2016
- Subjects: Xhosa language -- Lexicology Xhosa language -- Terms and phrases
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/21845 , vital:29793
- Description: The researcher’s decision to study the labelling of lexical items in dictionaries was prompted by the frustration experienced with subjective labelling in Afrikaans and English dictionaries. Some lexicographers rely too much on their subjective judgement when it comes to labelling lexical items. The problem with this is that the different dictionaries often label the same word differently or that words in the same dictionary which should get the same label are labelled differently. The question arose as to what exactly constitutes the correct handling of labels, especially with regard to Xhosa dictionaries. The search for an answer to achieve this aim dictated the necessity to examine the essence of the concept “label” in order to establish criteria for evaluating the effective usage of labels, because as Harteveld (1993:143) stated: “…the incorrect treatment of labels or the lack thereof can have important implications for a dictionary”. Since the hypothesis of this study is that it is possible to use labels objectively and correctly it is therefore possible to establish criteria that can be used to achieve this end. A literature review was undertaken to identify criteria for the handling of labels. Fieldwork with the aid of a questionnaire was conducted to supplement the establishment of such criteria. A number of criteria for handling labels was determined. Each criterion was discussed and its implementation was practically demonstrated by means of exemplars.
- Full Text:
- Date Issued: 2016
- Authors: Landman, Kie-Mari , Kwatsha, Linda Loretta , Otto, PR
- Date: 2016
- Subjects: Xhosa language -- Lexicology Xhosa language -- Terms and phrases
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/21845 , vital:29793
- Description: The researcher’s decision to study the labelling of lexical items in dictionaries was prompted by the frustration experienced with subjective labelling in Afrikaans and English dictionaries. Some lexicographers rely too much on their subjective judgement when it comes to labelling lexical items. The problem with this is that the different dictionaries often label the same word differently or that words in the same dictionary which should get the same label are labelled differently. The question arose as to what exactly constitutes the correct handling of labels, especially with regard to Xhosa dictionaries. The search for an answer to achieve this aim dictated the necessity to examine the essence of the concept “label” in order to establish criteria for evaluating the effective usage of labels, because as Harteveld (1993:143) stated: “…the incorrect treatment of labels or the lack thereof can have important implications for a dictionary”. Since the hypothesis of this study is that it is possible to use labels objectively and correctly it is therefore possible to establish criteria that can be used to achieve this end. A literature review was undertaken to identify criteria for the handling of labels. Fieldwork with the aid of a questionnaire was conducted to supplement the establishment of such criteria. A number of criteria for handling labels was determined. Each criterion was discussed and its implementation was practically demonstrated by means of exemplars.
- Full Text:
- Date Issued: 2016