Determining the impact of leadership on the success of entrepreneurs
- Authors: Mtshibe, Nomaswazi
- Date: 2013
- Subjects: Leadership , Success in business , Entrepreneurship -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8920 , http://hdl.handle.net/10948/d1021108
- Description: The Eastern Cape Province has been cited as the second poorest province in South Africa. The impact of entrepreneurship on the economy, with respect to socio-economic development, has placed increased pressure on entrepreneurs to operate effectively. Moreover, entrepreneurs are required to adopt and adapt to leadership practices that lead to business success. Business success is largely dependent on the leader. The importance of this study may, thus, be attributed to the need for entrepreneurs to possess the necessary leadership attributes for the efficient running of a business. The primary objective of this study was to improve the success rate of entrepreneurs in the Eastern Cape Province. This was done by determining the impact of selected leadership attributes on the success of entrepreneurs. More specifically, this study investigated how the success of entrepreneurs is influenced by leadership attributes (the dependent variable), namely, leadership style, vision, networking, risk-taking and ethics (the independent variables). In order to achieve the research objectives, the researcher used the inferential statistical approach, specifically, hypothesis testing. The first step was to conduct a literature review on factors that influence entrepreneurs. This entailed the barriers to success, critical success factors, the impact of the SMME sector on the economy, as well as the selected leadership attributes. Secondly, the quantitative research method was used to assess the perceptions of entrepreneurs with regards to the influence of the leadership attributes on their businesses. This was done through an empirical survey, namely a self-administered questionnaire that was distributed to a sample of 100 entrepreneurs who are based in the Eastern Cape Province and have been operating for a minimum of three years. Out of the envisaged 100 respondents, 89 questionnaires were completed (89% response rate). The data obtained from the empirical survey was then analysed statistically and the descriptive statistics were presented by using graphs and tables. The results of the empirical survey revealed that although all the above-mentioned independent variables contribute towards increasing the success rate of entrepreneurs, networking and ethics exert the most significant influence. Based on the findings of the literature review and the results of the empirical survey, this study made recommendations on areas of improvement for entrepreneurs in order to increase their success rate. Suggestions were also made for possible future research.
- Full Text:
- Date Issued: 2013
- Authors: Mtshibe, Nomaswazi
- Date: 2013
- Subjects: Leadership , Success in business , Entrepreneurship -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8920 , http://hdl.handle.net/10948/d1021108
- Description: The Eastern Cape Province has been cited as the second poorest province in South Africa. The impact of entrepreneurship on the economy, with respect to socio-economic development, has placed increased pressure on entrepreneurs to operate effectively. Moreover, entrepreneurs are required to adopt and adapt to leadership practices that lead to business success. Business success is largely dependent on the leader. The importance of this study may, thus, be attributed to the need for entrepreneurs to possess the necessary leadership attributes for the efficient running of a business. The primary objective of this study was to improve the success rate of entrepreneurs in the Eastern Cape Province. This was done by determining the impact of selected leadership attributes on the success of entrepreneurs. More specifically, this study investigated how the success of entrepreneurs is influenced by leadership attributes (the dependent variable), namely, leadership style, vision, networking, risk-taking and ethics (the independent variables). In order to achieve the research objectives, the researcher used the inferential statistical approach, specifically, hypothesis testing. The first step was to conduct a literature review on factors that influence entrepreneurs. This entailed the barriers to success, critical success factors, the impact of the SMME sector on the economy, as well as the selected leadership attributes. Secondly, the quantitative research method was used to assess the perceptions of entrepreneurs with regards to the influence of the leadership attributes on their businesses. This was done through an empirical survey, namely a self-administered questionnaire that was distributed to a sample of 100 entrepreneurs who are based in the Eastern Cape Province and have been operating for a minimum of three years. Out of the envisaged 100 respondents, 89 questionnaires were completed (89% response rate). The data obtained from the empirical survey was then analysed statistically and the descriptive statistics were presented by using graphs and tables. The results of the empirical survey revealed that although all the above-mentioned independent variables contribute towards increasing the success rate of entrepreneurs, networking and ethics exert the most significant influence. Based on the findings of the literature review and the results of the empirical survey, this study made recommendations on areas of improvement for entrepreneurs in order to increase their success rate. Suggestions were also made for possible future research.
- Full Text:
- Date Issued: 2013
Determining the impact of leadership on the success of entrepreneurs
- Authors: Mtshibe, Nomaswazi
- Date: 2013
- Subjects: Leadership , Success in business
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8852 , http://hdl.handle.net/10948/d1020126
- Description: The Eastern Cape Province has been cited as the second poorest province in South Africa. The impact of entrepreneurship on the economy, with respect to socio-economic development, has placed increased pressure on entrepreneurs to operate effectively. Moreover, entrepreneurs are required to adopt and adapt to leadership practices that lead to business success. Business success is largely dependent on the leader. The importance of this study may, thus, be attributed to the need for entrepreneurs to possess the necessary leadership attributes for the efficient running of a business. The primary objective of this study was to improve the success rate of entrepreneurs in the Eastern Cape Province. This was done by determining the impact of selected leadership attributes on the success of entrepreneurs. More specifically, this study investigated how the success of entrepreneurs is influenced by leadership attributes (the dependent variable), namely, leadership style, vision, networking, risk-taking and ethics (the independent variables). In order to achieve the research objectives, the researcher used the inferential statistical approach, specifically, hypothesis testing. The first step was to conduct a literature review on factors that influence entrepreneurs. This entailed the barriers to success, critical success factors, the impact of the SMME sector on the economy, as well as the selected leadership attributes. Secondly, the quantitative research method was used to assess the perceptions of entrepreneurs with regards to the influence of the leadership attributes on their businesses. This was done through an empirical survey, namely a self-administered questionnaire that was distributed to a sample of 100 entrepreneurs who are based in the Eastern Cape Province and have been operating for a minimum of three years. Out of the envisaged 100 respondents, 89 questionnaires were completed (89% response rate). The data obtained from the empirical survey was then analysed statistically and the descriptive statistics were presented by using graphs and tables. The results of the empirical survey revealed that although all the above-mentioned independent variables contribute towards increasing the success rate of entrepreneurs, networking and ethics exert the most significant influence. Based on the findings of the literature review and the results of the empirical survey, this study made recommendations on areas of improvement for entrepreneurs in order to increase their success rate. Suggestions were also made for possible future research.
- Full Text:
- Date Issued: 2013
- Authors: Mtshibe, Nomaswazi
- Date: 2013
- Subjects: Leadership , Success in business
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8852 , http://hdl.handle.net/10948/d1020126
- Description: The Eastern Cape Province has been cited as the second poorest province in South Africa. The impact of entrepreneurship on the economy, with respect to socio-economic development, has placed increased pressure on entrepreneurs to operate effectively. Moreover, entrepreneurs are required to adopt and adapt to leadership practices that lead to business success. Business success is largely dependent on the leader. The importance of this study may, thus, be attributed to the need for entrepreneurs to possess the necessary leadership attributes for the efficient running of a business. The primary objective of this study was to improve the success rate of entrepreneurs in the Eastern Cape Province. This was done by determining the impact of selected leadership attributes on the success of entrepreneurs. More specifically, this study investigated how the success of entrepreneurs is influenced by leadership attributes (the dependent variable), namely, leadership style, vision, networking, risk-taking and ethics (the independent variables). In order to achieve the research objectives, the researcher used the inferential statistical approach, specifically, hypothesis testing. The first step was to conduct a literature review on factors that influence entrepreneurs. This entailed the barriers to success, critical success factors, the impact of the SMME sector on the economy, as well as the selected leadership attributes. Secondly, the quantitative research method was used to assess the perceptions of entrepreneurs with regards to the influence of the leadership attributes on their businesses. This was done through an empirical survey, namely a self-administered questionnaire that was distributed to a sample of 100 entrepreneurs who are based in the Eastern Cape Province and have been operating for a minimum of three years. Out of the envisaged 100 respondents, 89 questionnaires were completed (89% response rate). The data obtained from the empirical survey was then analysed statistically and the descriptive statistics were presented by using graphs and tables. The results of the empirical survey revealed that although all the above-mentioned independent variables contribute towards increasing the success rate of entrepreneurs, networking and ethics exert the most significant influence. Based on the findings of the literature review and the results of the empirical survey, this study made recommendations on areas of improvement for entrepreneurs in order to increase their success rate. Suggestions were also made for possible future research.
- Full Text:
- Date Issued: 2013
Developing a business model for growth in social enterprise : a case study of a hybrid organisation
- Authors: Olivier, Grant Jerome
- Date: 2013
- Subjects: Social entrepreneurship , Business planning , Free enterprise -- Social aspects , Small business -- Growth
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8854 , http://hdl.handle.net/10948/d1020137
- Description: The Intshona Group of Companies operates in South Africa as a hybrid agribusiness combining entrepreneurial principles with a philosophy of social upliftment in Africa. This research views Intshona through the lens of social entrepreneurship theory, a hybrid research field with a dominant theme being the need for growth and scaling of impact, but which is seen as fragmented, containing ambiguities and lagging practice. In this research, a case study of Intshona is developed based on questionnaires and interviews with the organisation’s management, a concerned NGO, social beneficiaries as well as employees. The result is a two-way flow of knowledge integrating elements of existing social enterprise theory with Intshona’s business practices, building on a generic model of entrepreneurship and culminating in a business model for growth in a social enterprise. The research delivers strategic directives for Intshona for its future growth, presents a case study for addition to the body of knowledge on social entrepreneurship and concludes with suggestions for further research to continue developing theory.
- Full Text:
- Date Issued: 2013
- Authors: Olivier, Grant Jerome
- Date: 2013
- Subjects: Social entrepreneurship , Business planning , Free enterprise -- Social aspects , Small business -- Growth
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8854 , http://hdl.handle.net/10948/d1020137
- Description: The Intshona Group of Companies operates in South Africa as a hybrid agribusiness combining entrepreneurial principles with a philosophy of social upliftment in Africa. This research views Intshona through the lens of social entrepreneurship theory, a hybrid research field with a dominant theme being the need for growth and scaling of impact, but which is seen as fragmented, containing ambiguities and lagging practice. In this research, a case study of Intshona is developed based on questionnaires and interviews with the organisation’s management, a concerned NGO, social beneficiaries as well as employees. The result is a two-way flow of knowledge integrating elements of existing social enterprise theory with Intshona’s business practices, building on a generic model of entrepreneurship and culminating in a business model for growth in a social enterprise. The research delivers strategic directives for Intshona for its future growth, presents a case study for addition to the body of knowledge on social entrepreneurship and concludes with suggestions for further research to continue developing theory.
- Full Text:
- Date Issued: 2013
Developing teaching and learning skills at a Higher education institution: a collaborative action research study
- Authors: Mokhele, Paul Rampaola
- Date: 2013
- Subjects: Learning -- Study and teaching (Tertiary) -- South Africa
- Language: English
- Type: Thesis , Doctoral , D Ed
- Identifier: vital:18456 , http://hdl.handle.net/11260/d1007960
- Description: The thesis which was originally undertaken to improve my teaching skills and determine ways of allowing me space to live my academic values also turned out to become the enquiry to investigate students’ learning and study skills. Students and I collaborated in a year-long self-study action research where we were trying different teaching-learning strategies in order to improve our practice(s). Throughout the study I kept a reflective journal and students also reflected in a portfolio of learning their impressions about the new teaching-learning strategies. In addition to these data gathering methods data from students were gathered using chats, observation, and open-ended questionnaire. Data was analysed using a narrative method, reflexivity principle, and grounded theory. There are two major steps I followed in this study which are aimed at improving students’ basic study and learning skills, and my teaching skills. The first relates to action research into student learning at the school of Mathematics Science and Technology (MSTE) at a rural university. The study reveals that: Students have their own different and unique styles of learning, implementing various learning styles afford students an opportunity to find a style that matches their own. The second action step relates to my own self-study research trying different teaching methods based on my academic and personal values. Here, the study reveals that: The best teaching-learning practice is the one developed and agreed upon between the teacher educator and his or her students. These ‘action’ steps were not mutually exclusive – they were conducted in parallel. After the description of developing student learning skills at undergraduate level my reflections on the study followed in relation to theories and methods of teaching-learning and further revealed that what works with one group of students will not necessarily work with another group. The best teacher educator is constantly seeking ways of improving the learning experience of his or her students. The recommendations that teacher educators should become self reflective practitioners and improve their professions using self-study collaborative approach will benefit other teacher educators who are keen to study and improve their practice.
- Full Text:
- Date Issued: 2013
- Authors: Mokhele, Paul Rampaola
- Date: 2013
- Subjects: Learning -- Study and teaching (Tertiary) -- South Africa
- Language: English
- Type: Thesis , Doctoral , D Ed
- Identifier: vital:18456 , http://hdl.handle.net/11260/d1007960
- Description: The thesis which was originally undertaken to improve my teaching skills and determine ways of allowing me space to live my academic values also turned out to become the enquiry to investigate students’ learning and study skills. Students and I collaborated in a year-long self-study action research where we were trying different teaching-learning strategies in order to improve our practice(s). Throughout the study I kept a reflective journal and students also reflected in a portfolio of learning their impressions about the new teaching-learning strategies. In addition to these data gathering methods data from students were gathered using chats, observation, and open-ended questionnaire. Data was analysed using a narrative method, reflexivity principle, and grounded theory. There are two major steps I followed in this study which are aimed at improving students’ basic study and learning skills, and my teaching skills. The first relates to action research into student learning at the school of Mathematics Science and Technology (MSTE) at a rural university. The study reveals that: Students have their own different and unique styles of learning, implementing various learning styles afford students an opportunity to find a style that matches their own. The second action step relates to my own self-study research trying different teaching methods based on my academic and personal values. Here, the study reveals that: The best teaching-learning practice is the one developed and agreed upon between the teacher educator and his or her students. These ‘action’ steps were not mutually exclusive – they were conducted in parallel. After the description of developing student learning skills at undergraduate level my reflections on the study followed in relation to theories and methods of teaching-learning and further revealed that what works with one group of students will not necessarily work with another group. The best teacher educator is constantly seeking ways of improving the learning experience of his or her students. The recommendations that teacher educators should become self reflective practitioners and improve their professions using self-study collaborative approach will benefit other teacher educators who are keen to study and improve their practice.
- Full Text:
- Date Issued: 2013
Development and validation of in-process control test kits for biodiesel production
- Authors: Fibi, Pumza Oscarine
- Date: 2013
- Subjects: Biodiesel fuels -- South Africa , Biomass energy -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10416 , http://hdl.handle.net/10948/d1012645 , Biodiesel fuels -- South Africa , Biomass energy -- South Africa
- Description: The production of biodiesel from vegetable oils is not a new technology; it has been around since the 1950’s and both the research in terms of the different feedstock that can be used and the production of biodiesel has since been gaining momentum as there needs to be a new, sustainable and domestic alternative to petroleum fuels. These petroleum fuels pose enormous threats to the environment and therefore need to be replaced as they are mostly contributing to climate change and global warming not to mention the frequent price hikes which are crippling the South African economy. Biodiesel production using vegetable oils seems to be and is the future and a law has recently been passed which sanctions the production of biofuel locally.[1] South African fuel producers will instigate obligatory blending of fossil fuel with biofuel as the country moves to encourage investment in its biofuels sector. The production of biodiesel locally and the blending of biodiesel with other petroleum products will reduce the country’s dependence on imported fuel. The already established petrochemical companies like BP, Sasol and Engine are therefore mandated to purchase these biofuels if and when the biofuels meet the required South African National Standard (SANS) 1935 requirements. This is then where the challenge comes as most of these growing biofuel companies cannot afford to purchase testing equipment.The growing companiesthen discover upon completion of the biofuel manufacturing process that their product does not meet the required standard specification. The failure translates to a financial loss as the final product can possibly not be reworked. The aim of the project is then to assist these companies who are manufacturing biofuel, by providing them with in-house biofuel process methods which will allow for early detection, should there be a need to redo a step in the process and not wait until the completion of the production process. These in-house process-testing methods will range from pH determination, titration tests which will determine the soap content and the percentage free fatty acid content, water determination, density and visual testing. It is not cost-effective for these biodiesel manufacturers to send their samples for outsource testing as evidently the results obtained would be out of specification hence the need to provide these biodiesel manufacturers with in-house analytical testing techniques that will aid in monitoring of the biodiesel production.
- Full Text:
- Date Issued: 2013
- Authors: Fibi, Pumza Oscarine
- Date: 2013
- Subjects: Biodiesel fuels -- South Africa , Biomass energy -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10416 , http://hdl.handle.net/10948/d1012645 , Biodiesel fuels -- South Africa , Biomass energy -- South Africa
- Description: The production of biodiesel from vegetable oils is not a new technology; it has been around since the 1950’s and both the research in terms of the different feedstock that can be used and the production of biodiesel has since been gaining momentum as there needs to be a new, sustainable and domestic alternative to petroleum fuels. These petroleum fuels pose enormous threats to the environment and therefore need to be replaced as they are mostly contributing to climate change and global warming not to mention the frequent price hikes which are crippling the South African economy. Biodiesel production using vegetable oils seems to be and is the future and a law has recently been passed which sanctions the production of biofuel locally.[1] South African fuel producers will instigate obligatory blending of fossil fuel with biofuel as the country moves to encourage investment in its biofuels sector. The production of biodiesel locally and the blending of biodiesel with other petroleum products will reduce the country’s dependence on imported fuel. The already established petrochemical companies like BP, Sasol and Engine are therefore mandated to purchase these biofuels if and when the biofuels meet the required South African National Standard (SANS) 1935 requirements. This is then where the challenge comes as most of these growing biofuel companies cannot afford to purchase testing equipment.The growing companiesthen discover upon completion of the biofuel manufacturing process that their product does not meet the required standard specification. The failure translates to a financial loss as the final product can possibly not be reworked. The aim of the project is then to assist these companies who are manufacturing biofuel, by providing them with in-house biofuel process methods which will allow for early detection, should there be a need to redo a step in the process and not wait until the completion of the production process. These in-house process-testing methods will range from pH determination, titration tests which will determine the soap content and the percentage free fatty acid content, water determination, density and visual testing. It is not cost-effective for these biodiesel manufacturers to send their samples for outsource testing as evidently the results obtained would be out of specification hence the need to provide these biodiesel manufacturers with in-house analytical testing techniques that will aid in monitoring of the biodiesel production.
- Full Text:
- Date Issued: 2013
Development of a co-operative stakeholder framework for employment growth in the South African automotive sector
- Authors: Smith, Owen Christo
- Date: 2013
- Subjects: Cooperative societies -- South Africa , Job creation -- South Africa , Automobile industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8884 , http://hdl.handle.net/10948/d1020799
- Description: Manufacturing has been identified by the Department of Trade and Industry as an important sector to drive economic growth in South Africa. The automotive manufacturing sector in particular has seen significant support from the DTI in the form of incentives to produce motor vehicles and components. South Africa is faced with a high unemployment rate and one of the strategies of the Government is to drive economic growth by supporting the automotive manufacturing sector. One of the spill-over targets is to increase employment creation in the industry. The automotive manufacturing sector consists of a diverse list of stakeholders representing motor vehicle manufacturers, component manufacturers, labour unions, government departments and industry associations. The Motor Industry Development Programme delivered significant progress in the number of vehicles produced in South Africa and the biggest growth was in the export of vehicles. Employment creation on the other hand did not see the same levels of growth as motor vehicle and component production. The purpose of this study was to identify and clarify what the variables are that influence employment creation and to develop a co-operation framework that would guide the automotive cluster stakeholders to work on employment creation initiatives as a collective. The survey questionnaire results representing the perception of managers showed that: - DTI Incentives schemes linked to employment creation; - Productivity, Technology and employment; - The role of competitiveness in the auto cluster; - Labour Union Collective bargaining; - Investment climate and infrastructure; - Education and skills development; does have an influence on employment creation in the automotive cluster.
- Full Text:
- Date Issued: 2013
- Authors: Smith, Owen Christo
- Date: 2013
- Subjects: Cooperative societies -- South Africa , Job creation -- South Africa , Automobile industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8884 , http://hdl.handle.net/10948/d1020799
- Description: Manufacturing has been identified by the Department of Trade and Industry as an important sector to drive economic growth in South Africa. The automotive manufacturing sector in particular has seen significant support from the DTI in the form of incentives to produce motor vehicles and components. South Africa is faced with a high unemployment rate and one of the strategies of the Government is to drive economic growth by supporting the automotive manufacturing sector. One of the spill-over targets is to increase employment creation in the industry. The automotive manufacturing sector consists of a diverse list of stakeholders representing motor vehicle manufacturers, component manufacturers, labour unions, government departments and industry associations. The Motor Industry Development Programme delivered significant progress in the number of vehicles produced in South Africa and the biggest growth was in the export of vehicles. Employment creation on the other hand did not see the same levels of growth as motor vehicle and component production. The purpose of this study was to identify and clarify what the variables are that influence employment creation and to develop a co-operation framework that would guide the automotive cluster stakeholders to work on employment creation initiatives as a collective. The survey questionnaire results representing the perception of managers showed that: - DTI Incentives schemes linked to employment creation; - Productivity, Technology and employment; - The role of competitiveness in the auto cluster; - Labour Union Collective bargaining; - Investment climate and infrastructure; - Education and skills development; does have an influence on employment creation in the automotive cluster.
- Full Text:
- Date Issued: 2013
Development of a creep sample retrieval technique and friction weld site repair procedure
- Authors: Wedderburn, Ian Norman
- Date: 2013
- Subjects: Friction welding
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9635 , http://hdl.handle.net/10948/d1020116
- Description: The remnant life monitoring of creep loaded high temperature and pressure components in power stations is critical to ensuring their safe and cost effective operation as failures can have severe consequences. Effective creep life condition monitoring allows for optimising component life predictions and subsequent plant maintenance decisions. In South Africa many power generation stations have been in operation well beyond their 30 year design service life, as such knowledge of the remnant creep life of high temperature and pressure components, such as steam pipelines, becomes of utmost importance. Techniques for the remnant creep life assessments of critical high temperature and pressure components must therefore be as effective as possible. The common and well accepted in-situ inspection technique for assessing creep damage in steam pipes is by the metallographic replication technique. The technique is however limited to the outer surface of the pipe, without information on damage within the wall. This research will illustrate a means of obtaining a sample for creep life analysis with depth through the wall of a pipe, as wells as an alternative technique for the repair of the sample retrieval site. A sample retrieval technique was developed that would retrieve a small diameter cylindrical sample from a cored blind hole for creep analysis by visual creep void assessment or by the small punch creep test. The small punch creep test requires only a small diameter thin disc of material for testing for which its results are comparable with conventional uniaxial creep testing which requires a much larger sample of material. The smaller sample requirement of the small punch creep test therefore allows for a vastly reduced invasive sample retrieval operation and consequently smaller repair size area. Also the fact that the sample is retrieved from a blind hole is advantageous since the pipe wall is not penetrated which would require full plant shutdown. A friction welding technique was identified as an alternative to traditional arc fusion welding for the repair of the sample retrieval site, this technique being the Friction Hydro Pillar Processing technique. Friction Hydro Pillar Processing is a solid-state welding technique and as such has a number of inherent benefits over arc fusion welding as the weld is performed below the melting temperature of the material. From a process point of view Friction Hydro Pillar Processing is ideally suited for automation, has virtually no fumes generated, minimal distortion is experienced and no spatter has to be removed afterwards. The technique has yet to see industrial application and as such development of suitable process parameters was undertaken. Finally, to apply the sample retrieval and repair operations in-situ to a steam pipe in a power plant suitable equipment was developed. Existing friction welding equipment is generally bulky workshop based equipment and is unsuitable for on-site work due to its size and weight. Therefore development of dedicated equipment was required to enable Friction Hydro Pillar Processing to be applied to steam pipes within a power plant environment.
- Full Text:
- Date Issued: 2013
- Authors: Wedderburn, Ian Norman
- Date: 2013
- Subjects: Friction welding
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9635 , http://hdl.handle.net/10948/d1020116
- Description: The remnant life monitoring of creep loaded high temperature and pressure components in power stations is critical to ensuring their safe and cost effective operation as failures can have severe consequences. Effective creep life condition monitoring allows for optimising component life predictions and subsequent plant maintenance decisions. In South Africa many power generation stations have been in operation well beyond their 30 year design service life, as such knowledge of the remnant creep life of high temperature and pressure components, such as steam pipelines, becomes of utmost importance. Techniques for the remnant creep life assessments of critical high temperature and pressure components must therefore be as effective as possible. The common and well accepted in-situ inspection technique for assessing creep damage in steam pipes is by the metallographic replication technique. The technique is however limited to the outer surface of the pipe, without information on damage within the wall. This research will illustrate a means of obtaining a sample for creep life analysis with depth through the wall of a pipe, as wells as an alternative technique for the repair of the sample retrieval site. A sample retrieval technique was developed that would retrieve a small diameter cylindrical sample from a cored blind hole for creep analysis by visual creep void assessment or by the small punch creep test. The small punch creep test requires only a small diameter thin disc of material for testing for which its results are comparable with conventional uniaxial creep testing which requires a much larger sample of material. The smaller sample requirement of the small punch creep test therefore allows for a vastly reduced invasive sample retrieval operation and consequently smaller repair size area. Also the fact that the sample is retrieved from a blind hole is advantageous since the pipe wall is not penetrated which would require full plant shutdown. A friction welding technique was identified as an alternative to traditional arc fusion welding for the repair of the sample retrieval site, this technique being the Friction Hydro Pillar Processing technique. Friction Hydro Pillar Processing is a solid-state welding technique and as such has a number of inherent benefits over arc fusion welding as the weld is performed below the melting temperature of the material. From a process point of view Friction Hydro Pillar Processing is ideally suited for automation, has virtually no fumes generated, minimal distortion is experienced and no spatter has to be removed afterwards. The technique has yet to see industrial application and as such development of suitable process parameters was undertaken. Finally, to apply the sample retrieval and repair operations in-situ to a steam pipe in a power plant suitable equipment was developed. Existing friction welding equipment is generally bulky workshop based equipment and is unsuitable for on-site work due to its size and weight. Therefore development of dedicated equipment was required to enable Friction Hydro Pillar Processing to be applied to steam pipes within a power plant environment.
- Full Text:
- Date Issued: 2013
Development of a novel, quantitative assay for determining the rate of activity of antimalarial drugs
- Authors: Khan, Tasmiyah
- Date: 2013
- Subjects: Assay , ATP , Antimalarials -- Therapeutic use Malaria Malaria -- Drug therapy Adenosine triphosphate Luciferases Plasmodium falciparum
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3884 , http://hdl.handle.net/10962/d1001618
- Description: Malaria, caused by an intracellular Plasmodium parasite, remains a devastating disease, having claimed approximately 655 000 lives worldwide in 2010. The Medicines for Malaria Venture suggests a "single-dose radical cure" as the ideal malaria treatment since rapid clearance of blood-stage parasites and symptom relief improves patient compliance and limits drug resistance. Thus, novel antimalarials should be rapid-acting and assessing their rate of activity is critical to drug discovery. Traditional evaluation of this rate by morphological assessments is flawed by highly subjective, operator-specific interpretations, mainly due to heterogeneous parasite morphology under routine culture conditions. This study aimed to develop an alternative, quantitative assay. Energy is vital for the growth and maintenance of all living organisms. Commercially available kits allow rapid quantification of the cell's energy currency, ATP. Therefore, quantification of parasite ATP shows potential for diagnosing abnormal parasite metabolism and the kinetics of drug action. In this study, a rapid protocol for detecting ATP in Plasmodium falciparum parasites using a luminescence-based kit was developed and optimised. Furthermore, luciferase-expressing transgenic parasites, in which luciferase activity is detected using a similar kit, were acquired. The utility of both methods for evaluating the rate of drug-induced stress was explored using antimalarials with varying modes of action and, presumably, rates of activity. Results showed that parasite ATP remained unchanged, increased or decreased during drug exposure. Morphological examinations by light microscopy and a Recovery assay, aided interpretation of the drug-induced changes in parasite ATP. These investigations suggested that unchanged parasite ATP levels reflect poor drug action, increased ATP levels indicate a stress response and partially compromised viability, while significantly reduced ATP reflects severely compromised viability. Concerning the Luciferase assay, parasite luciferase activity decreased during drug exposure, even in the presence of proteasome inhibitors. Changes in parasite ATP and luciferase activity occurred at rates which suggested that chloroquine is slow-acting, mefloquine has a moderate rate of activity and artemisinin is rapid-acting. These findings are compatible with the expected rates of activity of these established antimalarials. Hence, measurement of parasite ATP and/or luciferase activity may support assessments of parasite health and the kinetics of antimalarial action during drug discovery
- Full Text:
- Date Issued: 2013
- Authors: Khan, Tasmiyah
- Date: 2013
- Subjects: Assay , ATP , Antimalarials -- Therapeutic use Malaria Malaria -- Drug therapy Adenosine triphosphate Luciferases Plasmodium falciparum
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3884 , http://hdl.handle.net/10962/d1001618
- Description: Malaria, caused by an intracellular Plasmodium parasite, remains a devastating disease, having claimed approximately 655 000 lives worldwide in 2010. The Medicines for Malaria Venture suggests a "single-dose radical cure" as the ideal malaria treatment since rapid clearance of blood-stage parasites and symptom relief improves patient compliance and limits drug resistance. Thus, novel antimalarials should be rapid-acting and assessing their rate of activity is critical to drug discovery. Traditional evaluation of this rate by morphological assessments is flawed by highly subjective, operator-specific interpretations, mainly due to heterogeneous parasite morphology under routine culture conditions. This study aimed to develop an alternative, quantitative assay. Energy is vital for the growth and maintenance of all living organisms. Commercially available kits allow rapid quantification of the cell's energy currency, ATP. Therefore, quantification of parasite ATP shows potential for diagnosing abnormal parasite metabolism and the kinetics of drug action. In this study, a rapid protocol for detecting ATP in Plasmodium falciparum parasites using a luminescence-based kit was developed and optimised. Furthermore, luciferase-expressing transgenic parasites, in which luciferase activity is detected using a similar kit, were acquired. The utility of both methods for evaluating the rate of drug-induced stress was explored using antimalarials with varying modes of action and, presumably, rates of activity. Results showed that parasite ATP remained unchanged, increased or decreased during drug exposure. Morphological examinations by light microscopy and a Recovery assay, aided interpretation of the drug-induced changes in parasite ATP. These investigations suggested that unchanged parasite ATP levels reflect poor drug action, increased ATP levels indicate a stress response and partially compromised viability, while significantly reduced ATP reflects severely compromised viability. Concerning the Luciferase assay, parasite luciferase activity decreased during drug exposure, even in the presence of proteasome inhibitors. Changes in parasite ATP and luciferase activity occurred at rates which suggested that chloroquine is slow-acting, mefloquine has a moderate rate of activity and artemisinin is rapid-acting. These findings are compatible with the expected rates of activity of these established antimalarials. Hence, measurement of parasite ATP and/or luciferase activity may support assessments of parasite health and the kinetics of antimalarial action during drug discovery
- Full Text:
- Date Issued: 2013
Development of thick section friction stir welding using a sliding tool shoulder
- Authors: Chetty, Shamalin
- Date: 2013
- Subjects: Friction welding
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9633 , http://hdl.handle.net/10948/d1015081
- Description: Sliding shoulder friction stir welding (SSFSW) is an alternative joining technique to the conventional friction stir welding process. The welding mechanism comprises of a rotating probe and a non-rotating shoulder. The shoulder therefore does not contribute to any heat generation or plastic deformation. When welding thicker section material, the contribution of heat generation from the shoulder becomes less significant and most of the heat and plastic deformation must be generated by the tool probe. For this reason it was decided to develop the process for thick section AA6082-T6. Due to the stationary (non-rotating) shoulder the weld track is smooth and there is no reduction in cross-sectional area. This research is based on the development of a sliding shoulder friction stir welding tool with the ability to create joints of up to 25mm thick on aluminium alloy 6082-T6 plate as well as the associated process development. The sliding shoulder friction stir welding tool was designed, manufactured and tested by initially performing partial penetration welds with various size tool probes and then finally by performing a sliding shoulder friction stir butt weld on 25mm thick plate. As welds were performed and more knowledge gained about the process, design modifications were made. These included varying the clearance between the tool probe and stationary shoulder; the profile of the shoulder which contributes to material flow during the process; and supporting the tool probe to prevent deflection when welding thicker sections at high forge forces. From the sliding shoulder friction stir welds performed, an understanding of material flow during the process was gained when analysing the macro-sections and exit holes of the welds. Typical process forces and torques associated with the process were measured to assist with future head unit and tool designs with regard to sliding shoulder friction stir welding.
- Full Text:
- Date Issued: 2013
- Authors: Chetty, Shamalin
- Date: 2013
- Subjects: Friction welding
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9633 , http://hdl.handle.net/10948/d1015081
- Description: Sliding shoulder friction stir welding (SSFSW) is an alternative joining technique to the conventional friction stir welding process. The welding mechanism comprises of a rotating probe and a non-rotating shoulder. The shoulder therefore does not contribute to any heat generation or plastic deformation. When welding thicker section material, the contribution of heat generation from the shoulder becomes less significant and most of the heat and plastic deformation must be generated by the tool probe. For this reason it was decided to develop the process for thick section AA6082-T6. Due to the stationary (non-rotating) shoulder the weld track is smooth and there is no reduction in cross-sectional area. This research is based on the development of a sliding shoulder friction stir welding tool with the ability to create joints of up to 25mm thick on aluminium alloy 6082-T6 plate as well as the associated process development. The sliding shoulder friction stir welding tool was designed, manufactured and tested by initially performing partial penetration welds with various size tool probes and then finally by performing a sliding shoulder friction stir butt weld on 25mm thick plate. As welds were performed and more knowledge gained about the process, design modifications were made. These included varying the clearance between the tool probe and stationary shoulder; the profile of the shoulder which contributes to material flow during the process; and supporting the tool probe to prevent deflection when welding thicker sections at high forge forces. From the sliding shoulder friction stir welds performed, an understanding of material flow during the process was gained when analysing the macro-sections and exit holes of the welds. Typical process forces and torques associated with the process were measured to assist with future head unit and tool designs with regard to sliding shoulder friction stir welding.
- Full Text:
- Date Issued: 2013
Diet and foraging distribution of gentoo penguins pygoscelis papua at Cow Bay, Falkland Islands
- Authors: Handley, Jonathan Murray
- Date: 2013
- Subjects: Gentoo penguin -- Food -- Falkland Islands
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10724 , http://hdl.handle.net/10948/d1020377
- Description: Knowledge of diet and distribution in marine top predators is critical in interpreting their ecological role. Furthermore, this information is required for effective management and conservation of these species. For gentoo penguins at the Falkland Islands a previous overlap in dietary items with commercial fisheries was recognised. Despite this the at-sea distribution has been poorly studied and only at a few localities. Therefore, this thesis looks to broaden the knowledge of foraging ecology for gentoo penguins at another site in the archipelago, Cow Bay. The aim was firstly, through stomach content analysis, to determine if diet changed over a large temporal scale (2002/03/04 – 2011/12/13), and between the chick guard and crèche periods of chick rearing. Secondly, through GPS loggers, to assess distribution at sea during the incubation and chick guard periods (2012/13). Additionally, foraging ecology between genders was investigated. Gentoo penguins at Cow Bay foraged primarily on fish (66-99 percent) throughout the entire study period. The principle prey item by mass was Patagonotothen spp., considered previously as discard by fisheries but now an important commercial resource, for all periods (47-78 percent) except that of the 2012/13 crèche period (19 percent). During this period Sprattus fugensis made up the bulk of the diet (52 percent). Cephalopods, particularly Loligo gahi (1-24 percent), were also prominent in the diet and crustaceans contributed negligibly. The diet indicated that gentoo penguins are capable of both a benthic and pelagic feeding strategy which likely reflects changes in local prey abundance. Birds typically conducted foraging activities during daylight hours with greater trip duration, path length, maximum distance and area utilised during the incubation period than the guard. All trips were confined to the continental shelf and within the boundaries of a marine management zone, the Falkland Islands Interim Conservation Zone (FICZ). Males and females fed on the same size and composition of prey items. Trip duration, path length and maximum distance from the colony were not significantly different, although males foraged in a slightly larger area than females marginally to the north. As at-sea distribution was confined within the FICZ this management area provides protection to food resources of gentoo penguins breeding at Cow Bay. At this site, the population is increasing, likely associated with increased prey availability as evidenced by record catches of Patagonotothen spp. in recent years at the Falkland Islands. Continued long term monitoring of gentoo penguin diet and fishery yields to allow detection of possible competition in the future is recommended. As marine sentinels, on-going monitoring of gentoo penguin populations at the Falkland Islands is likely to provide early warning signs of reduced prey availability.
- Full Text:
- Date Issued: 2013
- Authors: Handley, Jonathan Murray
- Date: 2013
- Subjects: Gentoo penguin -- Food -- Falkland Islands
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10724 , http://hdl.handle.net/10948/d1020377
- Description: Knowledge of diet and distribution in marine top predators is critical in interpreting their ecological role. Furthermore, this information is required for effective management and conservation of these species. For gentoo penguins at the Falkland Islands a previous overlap in dietary items with commercial fisheries was recognised. Despite this the at-sea distribution has been poorly studied and only at a few localities. Therefore, this thesis looks to broaden the knowledge of foraging ecology for gentoo penguins at another site in the archipelago, Cow Bay. The aim was firstly, through stomach content analysis, to determine if diet changed over a large temporal scale (2002/03/04 – 2011/12/13), and between the chick guard and crèche periods of chick rearing. Secondly, through GPS loggers, to assess distribution at sea during the incubation and chick guard periods (2012/13). Additionally, foraging ecology between genders was investigated. Gentoo penguins at Cow Bay foraged primarily on fish (66-99 percent) throughout the entire study period. The principle prey item by mass was Patagonotothen spp., considered previously as discard by fisheries but now an important commercial resource, for all periods (47-78 percent) except that of the 2012/13 crèche period (19 percent). During this period Sprattus fugensis made up the bulk of the diet (52 percent). Cephalopods, particularly Loligo gahi (1-24 percent), were also prominent in the diet and crustaceans contributed negligibly. The diet indicated that gentoo penguins are capable of both a benthic and pelagic feeding strategy which likely reflects changes in local prey abundance. Birds typically conducted foraging activities during daylight hours with greater trip duration, path length, maximum distance and area utilised during the incubation period than the guard. All trips were confined to the continental shelf and within the boundaries of a marine management zone, the Falkland Islands Interim Conservation Zone (FICZ). Males and females fed on the same size and composition of prey items. Trip duration, path length and maximum distance from the colony were not significantly different, although males foraged in a slightly larger area than females marginally to the north. As at-sea distribution was confined within the FICZ this management area provides protection to food resources of gentoo penguins breeding at Cow Bay. At this site, the population is increasing, likely associated with increased prey availability as evidenced by record catches of Patagonotothen spp. in recent years at the Falkland Islands. Continued long term monitoring of gentoo penguin diet and fishery yields to allow detection of possible competition in the future is recommended. As marine sentinels, on-going monitoring of gentoo penguin populations at the Falkland Islands is likely to provide early warning signs of reduced prey availability.
- Full Text:
- Date Issued: 2013
Disaster risk reduction in Namibia (flooding): responses and best practices
- Authors: Van der Ross, Nolan Lloyd
- Date: 2013
- Subjects: Flood damage prevention -- Risk assessment , delete
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9241 , http://hdl.handle.net/10948/d1021114
- Description: This study was undertaken in order to obtain an understanding of how Namibia in general, and the education sector in particular, deal with flood emergencies. The goal of the National Policy for Disaster Risk Management in Namibia (2009) is “to contribute to the attainment of sustainable development in line with Namibia’s Vision 2030 through strengthening national capacities to significantly reduce disaster risk and built community resilience to disasters” (Republic of Namibia, 2009). This goal was the starting point for determining the extent to which the Ministry of Education complies with these national standards, and for gauging, in the light of responses to flood emergencies so far, the Ministry’s preparedness and response capacities, in line with international frameworks that Namibia has ratified. This qualitative study is situated within the theory of resilience, and sustainable resilience particularly. To obtain some of the information sought, a non-probability sampling method was used to ‘hand-pick’ subjects within the Ministry of Education to be interviewed at their respective locations, nationally and regionally. Five education officials who were intimately involved in past responses to flood emergencies were interviewed – three in Oshana and Ohangwena Regions, and two at Head Office in Windhoek – by means of a semi-structured interview. In addition, a literature review was conducted. The conclusions drawn from both the literature review and the information obtained from the respondents accord with the research problem identified: the Ministry of Education does not appear to be adequately prepared for, and does not assign the necessary priority to deal with, flood emergencies in particular. Possible recommendations for uptake within the Ministry of Education include: mainstreaming Disaster Risk Reduction at all decentralized levels; sensitizing all education officials, school community members and relevant stakeholders to policy frameworks and accountability structures to strengthen resilience within school communities; deeming costed contingency planning a priority, and hence strengthening links between decentralized regional structures; and continuously monitoring implementation of designed interventions.
- Full Text:
- Date Issued: 2013
- Authors: Van der Ross, Nolan Lloyd
- Date: 2013
- Subjects: Flood damage prevention -- Risk assessment , delete
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9241 , http://hdl.handle.net/10948/d1021114
- Description: This study was undertaken in order to obtain an understanding of how Namibia in general, and the education sector in particular, deal with flood emergencies. The goal of the National Policy for Disaster Risk Management in Namibia (2009) is “to contribute to the attainment of sustainable development in line with Namibia’s Vision 2030 through strengthening national capacities to significantly reduce disaster risk and built community resilience to disasters” (Republic of Namibia, 2009). This goal was the starting point for determining the extent to which the Ministry of Education complies with these national standards, and for gauging, in the light of responses to flood emergencies so far, the Ministry’s preparedness and response capacities, in line with international frameworks that Namibia has ratified. This qualitative study is situated within the theory of resilience, and sustainable resilience particularly. To obtain some of the information sought, a non-probability sampling method was used to ‘hand-pick’ subjects within the Ministry of Education to be interviewed at their respective locations, nationally and regionally. Five education officials who were intimately involved in past responses to flood emergencies were interviewed – three in Oshana and Ohangwena Regions, and two at Head Office in Windhoek – by means of a semi-structured interview. In addition, a literature review was conducted. The conclusions drawn from both the literature review and the information obtained from the respondents accord with the research problem identified: the Ministry of Education does not appear to be adequately prepared for, and does not assign the necessary priority to deal with, flood emergencies in particular. Possible recommendations for uptake within the Ministry of Education include: mainstreaming Disaster Risk Reduction at all decentralized levels; sensitizing all education officials, school community members and relevant stakeholders to policy frameworks and accountability structures to strengthen resilience within school communities; deeming costed contingency planning a priority, and hence strengthening links between decentralized regional structures; and continuously monitoring implementation of designed interventions.
- Full Text:
- Date Issued: 2013
Dog wars : a Victorian steampunk adventure
- Authors: Molino, Nicolene Chloe
- Date: 2013
- Subjects: Creative writing , Fiction , South Africa , Creative writing (Higher education) , Short stories, South African (English) -- 21st century , South African fiction (English) -- 21st century , English language -- Writing
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:5965 , http://hdl.handle.net/10962/d1001815
- Description: We're in an alternate universe, circa Dickensian London. Leofric Lieven, a local crime lord, is about to find the past catching up on him. The Romany Carnival has come to town, and a gypsy woman, his former lover and partner in crime, demands from him a favour which will redress his betrayal of years before: he must secure a stolen object and return it to her. But things go horribly wrong when local delivery boy Cards Bennish is kidnapped by Leofric’s competitor before he can deliver the goods that will cover Leofric's debt to the gypsy. In this world, humans can shape shift into animals, entirely or only partially, dog fighting is the favourite pastime for high stakes betting, and power belongs to the highest bidder. The gypsy’s final bet, for the highest stakes yet, will seal the fates of a number of people, for better or worse
- Full Text:
- Date Issued: 2013
- Authors: Molino, Nicolene Chloe
- Date: 2013
- Subjects: Creative writing , Fiction , South Africa , Creative writing (Higher education) , Short stories, South African (English) -- 21st century , South African fiction (English) -- 21st century , English language -- Writing
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:5965 , http://hdl.handle.net/10962/d1001815
- Description: We're in an alternate universe, circa Dickensian London. Leofric Lieven, a local crime lord, is about to find the past catching up on him. The Romany Carnival has come to town, and a gypsy woman, his former lover and partner in crime, demands from him a favour which will redress his betrayal of years before: he must secure a stolen object and return it to her. But things go horribly wrong when local delivery boy Cards Bennish is kidnapped by Leofric’s competitor before he can deliver the goods that will cover Leofric's debt to the gypsy. In this world, humans can shape shift into animals, entirely or only partially, dog fighting is the favourite pastime for high stakes betting, and power belongs to the highest bidder. The gypsy’s final bet, for the highest stakes yet, will seal the fates of a number of people, for better or worse
- Full Text:
- Date Issued: 2013
Drivers of macrophyte assemblages in South African freshwater systems
- Authors: Martin, Grant Douglas
- Date: 2013
- Subjects: Freshwater plants -- South Africa Aquatic weeds -- South Africa Invasive plants -- South Africa Freshwater ecology -- South Africa Biotic communities -- South Africa Maximum entropy method Lagarosiphon major -- South Africa Phytophagous insects -- South Africa Hydrellia -- South Africa Parasitoids -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5621 , http://hdl.handle.net/10962/d1004127
- Description: Potentially damaging submerged invasive freshwater macrophytes have been identified in South African freshwater systems, but have received less attention than their floating counterparts. To ascertain the changes and effects that these species may have on macrophyte ecology, an understanding of the drivers of macrophyte assemblages is essential. The aims of this thesis were to investigate select abiotic and biotic factors driving introduction, establishment and spread of submerged macrophytes in South Africa. Surveys on the status of submerged plant species in South Africa were conducted to find out the distribution and diversity of the species present, imported to, and traded in South Africa. Numerous submerged indigenous and invasive macrophyte locality records were collected during field surveys, of which many were first time records. Pet stores and aquarist trading activities were identified as potential vectors for the spread of submerged macrophytes through online surveys and personal interviews. These results highlighted the potential these species have for continuing to enter, and spread within South African water bodies. Maximum Entropy (MAXENT) is a general-purpose method used to predict or infer distributions from incomplete information, and was used here to predict areas suitable for the establishment of five of these invasive macrophytes. Many systems throughout South Africa, particularly those in the subtropical coastal regions, were found to be climatically suitable for the establishment of Elodea canadensis Michx., Egeria densa Planch., Hydrilla verticillata (L.f.) Royle (all Hydrocharitaceae), Myriophyllum spicatum L. (Haloragaceae), and Cabomba caroliniana Gray (Cabombaceae). Despite the high probability of invasion, facilitated by vectors and suitable climate, South Africa’s rich indigenous submerged aquatic flora may be preventing the establishment of these submerged invasive species. Studies on the competitive interactions between a common indigenous submerged macrophytes, Lagarosiphon major (Roxb.) (Hydrocharitaceae) and M.spicatum, an invasive native to Eurasia, were conducted to ascertain which conditions influence competitive superiority. High sediment nutrient conditions significantly increased the growth rate and competitive ability of both species, while clay sediments significantly increased the competitive ability of L. major over M. spicatum, but sandy sediments improved the competitive ability of M. spicatum. These results highlighted the dynamic changes in competition between submerged species driven by abiotic factors, but did not take into consideration the effect that herbivory, a biotic factor, could have on competition between the two species. The effect of herbivory by phytophagous insects of submerged plant species has been regarded as negligible. To find out what this effect is, multiple field surveys were undertaken throughout South Africa to find natural enemies of indigenous Lagarosiphon species with the aim of identifying such species, and quantifying their influence on plant growth dynamics. Several new phytophagous species were recorded for the first time. An ephydrid fly, Hydrellia lagarosiphon Deeming (Diptera: Ephydridae) was ascertained to be the most ubiquitous and abundant species associated with L. major in South Africa. The influence of herbivory by this fly on the competitive ability of L. major in the presence of M. spicatum was investigated using an inverse linear model, which showed that herbivory by H. lagarosiphon reduced the competitive ability of L. major by approximately five times in favour of M. spicatum. This study served to highlight the importance of herbivory as a driver of submerged aquatic plant dynamics. Current ecological theory emphasises the importance of investigating beyond plant-herbivore interactions, by including multitrophic interactions in community dynamics. Therefore, the potential of parasitism by a parasitoid wasp, Chaenusa luteostigma sp. n. Achterberg (Hymenoptera: Braconidae: Alysiinae) on H. lagarosiphon to shift the competitive interactions between the two plant species was also examined. The addition of the parasitoid reduced the effect of herbivory by the fly on L. major by half, thereby shifting the competitive balance in favour of L. major over M. spicatum. This study provides valuable insight into a selection of drivers of submerged macrophyte assemblages of South Africa. It highlights the precarious position of South African freshwater systems with regard to the potential invasion by damaging submerged invasive species. It also provides interesting insights into the effect of competition, herbivory and parasitism on the establishment and spread of species within submerged freshwater systems. Understanding the different influences could assist managers and policy makers to make validated decisions ensuring the integrity of South African freshwater systems.
- Full Text:
- Date Issued: 2013
- Authors: Martin, Grant Douglas
- Date: 2013
- Subjects: Freshwater plants -- South Africa Aquatic weeds -- South Africa Invasive plants -- South Africa Freshwater ecology -- South Africa Biotic communities -- South Africa Maximum entropy method Lagarosiphon major -- South Africa Phytophagous insects -- South Africa Hydrellia -- South Africa Parasitoids -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5621 , http://hdl.handle.net/10962/d1004127
- Description: Potentially damaging submerged invasive freshwater macrophytes have been identified in South African freshwater systems, but have received less attention than their floating counterparts. To ascertain the changes and effects that these species may have on macrophyte ecology, an understanding of the drivers of macrophyte assemblages is essential. The aims of this thesis were to investigate select abiotic and biotic factors driving introduction, establishment and spread of submerged macrophytes in South Africa. Surveys on the status of submerged plant species in South Africa were conducted to find out the distribution and diversity of the species present, imported to, and traded in South Africa. Numerous submerged indigenous and invasive macrophyte locality records were collected during field surveys, of which many were first time records. Pet stores and aquarist trading activities were identified as potential vectors for the spread of submerged macrophytes through online surveys and personal interviews. These results highlighted the potential these species have for continuing to enter, and spread within South African water bodies. Maximum Entropy (MAXENT) is a general-purpose method used to predict or infer distributions from incomplete information, and was used here to predict areas suitable for the establishment of five of these invasive macrophytes. Many systems throughout South Africa, particularly those in the subtropical coastal regions, were found to be climatically suitable for the establishment of Elodea canadensis Michx., Egeria densa Planch., Hydrilla verticillata (L.f.) Royle (all Hydrocharitaceae), Myriophyllum spicatum L. (Haloragaceae), and Cabomba caroliniana Gray (Cabombaceae). Despite the high probability of invasion, facilitated by vectors and suitable climate, South Africa’s rich indigenous submerged aquatic flora may be preventing the establishment of these submerged invasive species. Studies on the competitive interactions between a common indigenous submerged macrophytes, Lagarosiphon major (Roxb.) (Hydrocharitaceae) and M.spicatum, an invasive native to Eurasia, were conducted to ascertain which conditions influence competitive superiority. High sediment nutrient conditions significantly increased the growth rate and competitive ability of both species, while clay sediments significantly increased the competitive ability of L. major over M. spicatum, but sandy sediments improved the competitive ability of M. spicatum. These results highlighted the dynamic changes in competition between submerged species driven by abiotic factors, but did not take into consideration the effect that herbivory, a biotic factor, could have on competition between the two species. The effect of herbivory by phytophagous insects of submerged plant species has been regarded as negligible. To find out what this effect is, multiple field surveys were undertaken throughout South Africa to find natural enemies of indigenous Lagarosiphon species with the aim of identifying such species, and quantifying their influence on plant growth dynamics. Several new phytophagous species were recorded for the first time. An ephydrid fly, Hydrellia lagarosiphon Deeming (Diptera: Ephydridae) was ascertained to be the most ubiquitous and abundant species associated with L. major in South Africa. The influence of herbivory by this fly on the competitive ability of L. major in the presence of M. spicatum was investigated using an inverse linear model, which showed that herbivory by H. lagarosiphon reduced the competitive ability of L. major by approximately five times in favour of M. spicatum. This study served to highlight the importance of herbivory as a driver of submerged aquatic plant dynamics. Current ecological theory emphasises the importance of investigating beyond plant-herbivore interactions, by including multitrophic interactions in community dynamics. Therefore, the potential of parasitism by a parasitoid wasp, Chaenusa luteostigma sp. n. Achterberg (Hymenoptera: Braconidae: Alysiinae) on H. lagarosiphon to shift the competitive interactions between the two plant species was also examined. The addition of the parasitoid reduced the effect of herbivory by the fly on L. major by half, thereby shifting the competitive balance in favour of L. major over M. spicatum. This study provides valuable insight into a selection of drivers of submerged macrophyte assemblages of South Africa. It highlights the precarious position of South African freshwater systems with regard to the potential invasion by damaging submerged invasive species. It also provides interesting insights into the effect of competition, herbivory and parasitism on the establishment and spread of species within submerged freshwater systems. Understanding the different influences could assist managers and policy makers to make validated decisions ensuring the integrity of South African freshwater systems.
- Full Text:
- Date Issued: 2013
Dynamic linkages between monetary policy and the stock market: the case of South Africa
- Authors: Mabitle, Mope
- Date: 2013
- Subjects: Johannesburg Stock Exchange , South African Reserve Bank , Monetary policy -- South Africa
- Language: English
- Type: Thesis , Masters , M Com
- Identifier: vital:11483 , http://hdl.handle.net/10353/d1015290 , Johannesburg Stock Exchange , South African Reserve Bank , Monetary policy -- South Africa
- Description: This study analyses the linkage between monetary policy and the stock market in South Africa using monthly data for the period from 2000 to 2010. It provides an overview of the Johannesburg Stock Exchange and the monetary regimes adopted by the South African Reserve Bank since the 1960s and the interrelation between the monetary variables and the stock market. It also provides a review of literature, both theoretical and empirical on the linkages between the two variables. Based on the review of literature, a Vector Autoregression [VAR] model was chosen as a method of analyzing the relationship between the two variables. The empirical results revealed that there is no long term relationship between the variables, however, in the short-run there is a dynamic relationship between monetary policy and the stock market in South Africa. This implies that innovations in the stock market affect the implementation of monetary policy and vice-versa. The study recommended that monetary authorities should pay attention to the fact that the stock market performance has a great impact on their decision making due to the fact it is greatly affected by repo rates.
- Full Text:
- Date Issued: 2013
- Authors: Mabitle, Mope
- Date: 2013
- Subjects: Johannesburg Stock Exchange , South African Reserve Bank , Monetary policy -- South Africa
- Language: English
- Type: Thesis , Masters , M Com
- Identifier: vital:11483 , http://hdl.handle.net/10353/d1015290 , Johannesburg Stock Exchange , South African Reserve Bank , Monetary policy -- South Africa
- Description: This study analyses the linkage between monetary policy and the stock market in South Africa using monthly data for the period from 2000 to 2010. It provides an overview of the Johannesburg Stock Exchange and the monetary regimes adopted by the South African Reserve Bank since the 1960s and the interrelation between the monetary variables and the stock market. It also provides a review of literature, both theoretical and empirical on the linkages between the two variables. Based on the review of literature, a Vector Autoregression [VAR] model was chosen as a method of analyzing the relationship between the two variables. The empirical results revealed that there is no long term relationship between the variables, however, in the short-run there is a dynamic relationship between monetary policy and the stock market in South Africa. This implies that innovations in the stock market affect the implementation of monetary policy and vice-versa. The study recommended that monetary authorities should pay attention to the fact that the stock market performance has a great impact on their decision making due to the fact it is greatly affected by repo rates.
- Full Text:
- Date Issued: 2013
Dysfunctional facilities management service provision in an outsource environment
- Authors: Otoo, Ernest Kweku
- Date: 2013
- Subjects: Facility management
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9725 , http://hdl.handle.net/10948/d1019717
- Full Text:
- Date Issued: 2013
- Authors: Otoo, Ernest Kweku
- Date: 2013
- Subjects: Facility management
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9725 , http://hdl.handle.net/10948/d1019717
- Full Text:
- Date Issued: 2013
Econometric analysis of labour demand in the South African textiles, clothing and footwear manufacturing sector: 1990-2012
- Authors: Chikwanha, Tafadzwa R
- Date: 2013
- Language: English
- Type: Thesis , Masters , M Com
- Identifier: vital:11498 , http://hdl.handle.net/10353/d1018551
- Description: South Africa in its quest for socio-economic improvement still faces the problem of persistent unemployment. Unemployment in South Africa is very intricate and therefore makes it a complex challenge to tackle for policy makers. Differing unemployment phenomena exist in different sectors of the economy. Some sectors are facing employment growth while others are declining. This study examines the possible major determinants of labour demand (employment) in the textiles, clothing and footwear manufacturing sector in South Africa. The study is based on semi-annual time series data from 1990 to 2012. The Johansen (1991) model is used to examine the trends. The model is an error correction model imposed upon a vector autoregressive model. The results obtained showed that wages and imports both have negative relationships with the demand for workers. Based on these two important results, policy recommendations were made. The study recommended the introduction of a sector-based wage subsidy. The wage structure in South Africa is a perpetually problematic factor of the labour market and therefore a significant determinant in the viability of business and investment. Secondly, the import structure on textiles, clothing and footwear is not clearly and thoroughly setup. A complete restructuring of import tariffs on the entire sector is suggested.
- Full Text:
- Date Issued: 2013
- Authors: Chikwanha, Tafadzwa R
- Date: 2013
- Language: English
- Type: Thesis , Masters , M Com
- Identifier: vital:11498 , http://hdl.handle.net/10353/d1018551
- Description: South Africa in its quest for socio-economic improvement still faces the problem of persistent unemployment. Unemployment in South Africa is very intricate and therefore makes it a complex challenge to tackle for policy makers. Differing unemployment phenomena exist in different sectors of the economy. Some sectors are facing employment growth while others are declining. This study examines the possible major determinants of labour demand (employment) in the textiles, clothing and footwear manufacturing sector in South Africa. The study is based on semi-annual time series data from 1990 to 2012. The Johansen (1991) model is used to examine the trends. The model is an error correction model imposed upon a vector autoregressive model. The results obtained showed that wages and imports both have negative relationships with the demand for workers. Based on these two important results, policy recommendations were made. The study recommended the introduction of a sector-based wage subsidy. The wage structure in South Africa is a perpetually problematic factor of the labour market and therefore a significant determinant in the viability of business and investment. Secondly, the import structure on textiles, clothing and footwear is not clearly and thoroughly setup. A complete restructuring of import tariffs on the entire sector is suggested.
- Full Text:
- Date Issued: 2013
Education District Office support for teaching and learning in schools: the case of two districts in the Eastern Cape
- Authors: Mavuso, Mzuyanda Percival
- Date: 2013
- Subjects: Schools -- Development -- South Africa -- Eastern Cape , School management and organization -- South Africa -- Eastern Cape , Educational change -- South Africa -- Eastern Cape , School management teams -- South Africa -- Eastern Cape , School administrators -- South Africa -- Eastern Cape , School supervision -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape , Educational evaluation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Education)
- Identifier: vital:16194 , http://hdl.handle.net/10353/d1006259 , Schools -- Development -- South Africa -- Eastern Cape , School management and organization -- South Africa -- Eastern Cape , Educational change -- South Africa -- Eastern Cape , School management teams -- South Africa -- Eastern Cape , School administrators -- South Africa -- Eastern Cape , School supervision -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape , Educational evaluation -- South Africa -- Eastern Cape
- Description: The idea of district support for schools is based on the view that local education offices are best placed to play a critical role in the promotion of quality teaching and learning. In performing this mandate whose characterisation has, over time, moved away from ‘inspection’ and ‘supervision’ both of which are seen as old fashioned and undemocratic, to support, which is seen as developmental. The aim of this study was to understand how three categories of district based officers, Subject Advisors, Integrated Quality Management System Coordinators and Education Development Officers support teaching and learning in schools. This was a case study of two districts in the Eastern Cape Province of South Africa. A total of six district officials and four school based officials participated in this study. In-depth interviews and document analysis were carried out. There were four main findings. First, support for schools by three district based officials was understood and practiced as administrative tasks, mainly consisting of monitoring policy implementation and monitoring resource provision to schools. School Management Teams saw district officers’ visits as focussing on compliance rather than support. Second, some pedagogical support was given by Subject Advisors through training teachers in subject content and methods of teaching that subject. This was done through workshops and demonstration lessons. However Subject Advisors did not at any time observe actual classroom teaching to see if teachers were implementing what they had learnt at workshops. Third, none of the officers mentioned direct support for teaching and learning at classroom level. Visits by officials were not directly linked to influencing teaching and learning classroom level. Fourth, schools saw district officials as working in separate pockets and sometimes sending different signals to them, despite claims by district officials that inter-disciplinary meetings were held among district officials, however, the nature of the coordination and the use to which it is put remains unclear. There were three main conclusions, first that although the district officials’ visits to schools were described as support, they exhibited the trappings of technicism of inspection; supervision and control; and appeared to neglect the developmental aspects implied in the notion of support. Second, the conception and practice of support visits by district officials were characterised by tension between support and control. Third, at district level support to schools lacked coordination among the three categories of officers who visit schools. This has implications for quality management in schools. Given the findings and conclusions of this study; it is recommended that the issue of support for schools be the focus of a survey research for which a probability sample must be drawn in order to generate findings that are generalisable across the participating target population. Other research could focus on investigating mechanisms by which the tension between support and control can be resolved. To improve practice of a framework for the development of a coordinated district support focusing on the core business of teaching and learning is suggested.
- Full Text:
- Date Issued: 2013
- Authors: Mavuso, Mzuyanda Percival
- Date: 2013
- Subjects: Schools -- Development -- South Africa -- Eastern Cape , School management and organization -- South Africa -- Eastern Cape , Educational change -- South Africa -- Eastern Cape , School management teams -- South Africa -- Eastern Cape , School administrators -- South Africa -- Eastern Cape , School supervision -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape , Educational evaluation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD (Education)
- Identifier: vital:16194 , http://hdl.handle.net/10353/d1006259 , Schools -- Development -- South Africa -- Eastern Cape , School management and organization -- South Africa -- Eastern Cape , Educational change -- South Africa -- Eastern Cape , School management teams -- South Africa -- Eastern Cape , School administrators -- South Africa -- Eastern Cape , School supervision -- South Africa -- Eastern Cape , School improvement programs -- South Africa -- Eastern Cape , Educational leadership -- South Africa -- Eastern Cape , Educational evaluation -- South Africa -- Eastern Cape
- Description: The idea of district support for schools is based on the view that local education offices are best placed to play a critical role in the promotion of quality teaching and learning. In performing this mandate whose characterisation has, over time, moved away from ‘inspection’ and ‘supervision’ both of which are seen as old fashioned and undemocratic, to support, which is seen as developmental. The aim of this study was to understand how three categories of district based officers, Subject Advisors, Integrated Quality Management System Coordinators and Education Development Officers support teaching and learning in schools. This was a case study of two districts in the Eastern Cape Province of South Africa. A total of six district officials and four school based officials participated in this study. In-depth interviews and document analysis were carried out. There were four main findings. First, support for schools by three district based officials was understood and practiced as administrative tasks, mainly consisting of monitoring policy implementation and monitoring resource provision to schools. School Management Teams saw district officers’ visits as focussing on compliance rather than support. Second, some pedagogical support was given by Subject Advisors through training teachers in subject content and methods of teaching that subject. This was done through workshops and demonstration lessons. However Subject Advisors did not at any time observe actual classroom teaching to see if teachers were implementing what they had learnt at workshops. Third, none of the officers mentioned direct support for teaching and learning at classroom level. Visits by officials were not directly linked to influencing teaching and learning classroom level. Fourth, schools saw district officials as working in separate pockets and sometimes sending different signals to them, despite claims by district officials that inter-disciplinary meetings were held among district officials, however, the nature of the coordination and the use to which it is put remains unclear. There were three main conclusions, first that although the district officials’ visits to schools were described as support, they exhibited the trappings of technicism of inspection; supervision and control; and appeared to neglect the developmental aspects implied in the notion of support. Second, the conception and practice of support visits by district officials were characterised by tension between support and control. Third, at district level support to schools lacked coordination among the three categories of officers who visit schools. This has implications for quality management in schools. Given the findings and conclusions of this study; it is recommended that the issue of support for schools be the focus of a survey research for which a probability sample must be drawn in order to generate findings that are generalisable across the participating target population. Other research could focus on investigating mechanisms by which the tension between support and control can be resolved. To improve practice of a framework for the development of a coordinated district support focusing on the core business of teaching and learning is suggested.
- Full Text:
- Date Issued: 2013
Effect of agricultural extension services on beneficiaries of the Nguni cattle project: the case of Ncera and Kwezana villages, Eastern Cape Province
- Authors: Gwala, Lindokuhle
- Date: 2013
- Subjects: Agricultural assistance -- South Africa -- Eastern Cape , Agricultural extension work -- South Africa -- Eastern Cape , Agriculture, Cooperative -- South Africa -- Eastern Cape , Farmers -- Education -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc Agric (Agricultural Economics)
- Identifier: vital:11219 , http://hdl.handle.net/10353/d1019814 , Agricultural assistance -- South Africa -- Eastern Cape , Agricultural extension work -- South Africa -- Eastern Cape , Agriculture, Cooperative -- South Africa -- Eastern Cape , Farmers -- Education -- South Africa -- Eastern Cape
- Description: The study was conducted to determine the effect of agricultural extension services on beneficiaries of the Nguni Cattle project in Ncera and Kwezana villages, both in Nkonkobe local Municipality of the Eastern Cape Province. The objectives of this study were to determine the quality of extension services offered to the beneficiaries of the Nguni cattle project, relationship between extension officers and beneficiaries of the project, lastly was to determine communication strategies used by extension officers to communicate with the project beneficiaries. A total of 73 Nguni cattle project beneficiaries were interviewed. Semi- structured questionnaires were administered to the beneficiaries of the project who were willing to participate in the study. Xhosa speaking enumerators assisted in data collection. Focus group discussions were later carried out in both villages to determine effect of agricultural extension services on socio-economic status of the beneficiaries. The focus groups were divided into three groups of different ages and gender. The majority of the beneficiaries in the project were males (62.2 % Ncera and 75% Kwezana). There was an association between gender and extension services. Farmers depended on different sources of income. Old age pension and animal sales being the main contributing sources and also having a significant difference. The results of the study further revealed that the beneficiaries were faced with cattle production challenges, lack of extension support services being the main challenge. The results of the study indicated that the majority of beneficiaries had no access to extension services. Only 37.8% and 32.1 % at Ncera and Kwezana respectively reported that they had access to extension services. Although the latter is the case it was further explained by the beneficiaries that extension services offered to them were of poor quality due to poor communication strategies used to provide these services. Beneficiaries also reported the relationship between them and extension officers’ as poor. It was concluded that extension services had an effect on beneficiaries of the Nguni cattle project, largely based on the constraints they face on the project and limited access to extension services.
- Full Text:
- Date Issued: 2013
- Authors: Gwala, Lindokuhle
- Date: 2013
- Subjects: Agricultural assistance -- South Africa -- Eastern Cape , Agricultural extension work -- South Africa -- Eastern Cape , Agriculture, Cooperative -- South Africa -- Eastern Cape , Farmers -- Education -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc Agric (Agricultural Economics)
- Identifier: vital:11219 , http://hdl.handle.net/10353/d1019814 , Agricultural assistance -- South Africa -- Eastern Cape , Agricultural extension work -- South Africa -- Eastern Cape , Agriculture, Cooperative -- South Africa -- Eastern Cape , Farmers -- Education -- South Africa -- Eastern Cape
- Description: The study was conducted to determine the effect of agricultural extension services on beneficiaries of the Nguni Cattle project in Ncera and Kwezana villages, both in Nkonkobe local Municipality of the Eastern Cape Province. The objectives of this study were to determine the quality of extension services offered to the beneficiaries of the Nguni cattle project, relationship between extension officers and beneficiaries of the project, lastly was to determine communication strategies used by extension officers to communicate with the project beneficiaries. A total of 73 Nguni cattle project beneficiaries were interviewed. Semi- structured questionnaires were administered to the beneficiaries of the project who were willing to participate in the study. Xhosa speaking enumerators assisted in data collection. Focus group discussions were later carried out in both villages to determine effect of agricultural extension services on socio-economic status of the beneficiaries. The focus groups were divided into three groups of different ages and gender. The majority of the beneficiaries in the project were males (62.2 % Ncera and 75% Kwezana). There was an association between gender and extension services. Farmers depended on different sources of income. Old age pension and animal sales being the main contributing sources and also having a significant difference. The results of the study further revealed that the beneficiaries were faced with cattle production challenges, lack of extension support services being the main challenge. The results of the study indicated that the majority of beneficiaries had no access to extension services. Only 37.8% and 32.1 % at Ncera and Kwezana respectively reported that they had access to extension services. Although the latter is the case it was further explained by the beneficiaries that extension services offered to them were of poor quality due to poor communication strategies used to provide these services. Beneficiaries also reported the relationship between them and extension officers’ as poor. It was concluded that extension services had an effect on beneficiaries of the Nguni cattle project, largely based on the constraints they face on the project and limited access to extension services.
- Full Text:
- Date Issued: 2013
Effect of dietary inclusion of Moringa oleifera Lam leaf meal on feed conversion efficiency, meat quality, fatty acid composition, shelf life and consumer health-related perceptions of pork
- Authors: Mukumbo, Felicitas Esnart
- Date: 2013
- Subjects: Moringa oleifera , Meat -- Quality , Feed utilization efficiency
- Language: English
- Type: Thesis , Masters , MSc Agric (Animal Science)
- Identifier: vital:11827 , http://hdl.handle.net/10353/d1016071 , Moringa oleifera , Meat -- Quality , Feed utilization efficiency
- Description: The objective of the study was to determine the feed conversion efficiency (FCE), carcass characteristics, physico-chemical quality, fatty acid (FA) composition and shelf life of pork from pigs fed diets containing either 0% (T1), 2.5% (T2), 5% (T3) or 7.5% (T4) Moringa oleifera leaf meal (MOLM). Consumer health-related perceptions on pork and fatty acids were also investigated. Twenty four crossbred Large White x Landrace pigs of both sexes at 18 weeks of age and initially weighing 71.6 kg on average were housed individually and had ad libitum access to one of the four dietary treatments for a period of six weeks. Average daily feed intake (ADFI) and average daily gain (ADG) and feed conversion ratios (FCR) were calculated as an indication of FCE and pigs were slaughtered at an average live weight of 99.6 kg. Carcass traits such as back fat thickness (BFT), carcass temperatures and pH readings taken 45 minutes and 24 hours (pH45 and pHu) post mortem were recorded. M. longissimus thoracis et lumborum (LTL) samples were taken from each carcass for the determination of lightness (L*), redness (a*), yellowness (b*), thawing loss percentage (TL%), cooking loss percentage (CL%), Warner Bratzler Shear Force (WBSF), shelf life and FA composition. Furthermore a survey was conducted amongst 80 University of Fort Hare Students to determine their health-related perceptions on pork and fatty acids as well as their pork consumption frequency using questionnaires. The FCE of pigs fed on 0-5% MOLM (T1, T2 and T3) diets did not differ significantly, but the FCE of pigs fed 7.5% MOLM (T4) was significantly (p<0.05) reduced. No significant relationship was reported between inclusion of MOLM carcass characteristics and physico-chemical pork quality. There was however a significant improvement (p<0.05) in the shelf life of the pork from MOLM fed pigs in terms of colour and odour during 10 days of refrigerated storage (at 3±1°C). There was a significant (p<0.05) reduction in the total intramuscular fat (IMF) content and the saturated fatty acid (SFA) C18:0 (stearic acid) content and an overall non-significant (p>0.05) increase in the poly unsaturated fatty acid (PUFA) content of pork from MOLM fed pigs. The possible reason for this is that the feeding of MOLM was commenced when the pigs were at an advanced age and weight. The survey revealed that the majority of interviewed students consume fresh (39.7%) and processed (32.4%) pork two to three times a week, perceive pork to be generally healthy (70%) and the second most healthy meat type (39.5%). While the majority (55.4%) were aware of the health implications of FAs they did not know which FA classes pose more of a health risk (51.3%). In conclusion2.5% and 5% of MOLM in finisher pig feed did not negatively affect FCE, carcass characteristics or physico-chemical meat quality; significantly improved pork shelf life and reduced total IMF and SFA content of pork but 7.5% MOLM negatively affected FCE; and the majority of students perceive pork to be the second most healthy type of meat and are generally aware of the health implications of FAs.
- Full Text:
- Date Issued: 2013
- Authors: Mukumbo, Felicitas Esnart
- Date: 2013
- Subjects: Moringa oleifera , Meat -- Quality , Feed utilization efficiency
- Language: English
- Type: Thesis , Masters , MSc Agric (Animal Science)
- Identifier: vital:11827 , http://hdl.handle.net/10353/d1016071 , Moringa oleifera , Meat -- Quality , Feed utilization efficiency
- Description: The objective of the study was to determine the feed conversion efficiency (FCE), carcass characteristics, physico-chemical quality, fatty acid (FA) composition and shelf life of pork from pigs fed diets containing either 0% (T1), 2.5% (T2), 5% (T3) or 7.5% (T4) Moringa oleifera leaf meal (MOLM). Consumer health-related perceptions on pork and fatty acids were also investigated. Twenty four crossbred Large White x Landrace pigs of both sexes at 18 weeks of age and initially weighing 71.6 kg on average were housed individually and had ad libitum access to one of the four dietary treatments for a period of six weeks. Average daily feed intake (ADFI) and average daily gain (ADG) and feed conversion ratios (FCR) were calculated as an indication of FCE and pigs were slaughtered at an average live weight of 99.6 kg. Carcass traits such as back fat thickness (BFT), carcass temperatures and pH readings taken 45 minutes and 24 hours (pH45 and pHu) post mortem were recorded. M. longissimus thoracis et lumborum (LTL) samples were taken from each carcass for the determination of lightness (L*), redness (a*), yellowness (b*), thawing loss percentage (TL%), cooking loss percentage (CL%), Warner Bratzler Shear Force (WBSF), shelf life and FA composition. Furthermore a survey was conducted amongst 80 University of Fort Hare Students to determine their health-related perceptions on pork and fatty acids as well as their pork consumption frequency using questionnaires. The FCE of pigs fed on 0-5% MOLM (T1, T2 and T3) diets did not differ significantly, but the FCE of pigs fed 7.5% MOLM (T4) was significantly (p<0.05) reduced. No significant relationship was reported between inclusion of MOLM carcass characteristics and physico-chemical pork quality. There was however a significant improvement (p<0.05) in the shelf life of the pork from MOLM fed pigs in terms of colour and odour during 10 days of refrigerated storage (at 3±1°C). There was a significant (p<0.05) reduction in the total intramuscular fat (IMF) content and the saturated fatty acid (SFA) C18:0 (stearic acid) content and an overall non-significant (p>0.05) increase in the poly unsaturated fatty acid (PUFA) content of pork from MOLM fed pigs. The possible reason for this is that the feeding of MOLM was commenced when the pigs were at an advanced age and weight. The survey revealed that the majority of interviewed students consume fresh (39.7%) and processed (32.4%) pork two to three times a week, perceive pork to be generally healthy (70%) and the second most healthy meat type (39.5%). While the majority (55.4%) were aware of the health implications of FAs they did not know which FA classes pose more of a health risk (51.3%). In conclusion2.5% and 5% of MOLM in finisher pig feed did not negatively affect FCE, carcass characteristics or physico-chemical meat quality; significantly improved pork shelf life and reduced total IMF and SFA content of pork but 7.5% MOLM negatively affected FCE; and the majority of students perceive pork to be the second most healthy type of meat and are generally aware of the health implications of FAs.
- Full Text:
- Date Issued: 2013
Effectiveness of irrigation water management institutions in Zimbabwe: a new institutional economics theory approach
- Authors: Nhundu, Kenneth
- Date: 2013
- Language: English
- Type: Thesis , Doctoral , PhD (Agricultural Economics)
- Identifier: vital:11195 , http://hdl.handle.net/10353/d1006784
- Description: Despite considerable advances in technology across the world, some scholars (Bratton, 1987; Namara et al., 2010) have argued that declining agricultural productivity among smallholder farmers in Africa remains a major bottleneck in the development of the continent. Unganai (1993) indicates that about 60% of the southern African region is semi-arid or arid and suffers from periodic droughts. In addition, World Bank (2003) notes that agricultural production is dominated by rain-fed agriculture and irrigation systems are limited. This is compounded by the scarcity and poor management of irrigation water resources. Water scarcity in agriculture has large impacts on the population, especially in rural areas, where more than 60 percent of the population are engaged in agriculture which represents their main source of food and income (FAO, 2008). On the macroeconomic level, agricultural share of the GDP is about 37 percent and 75 percent of the export value is generated from the agricultural sector globally. To this effect, management of agricultural water particularly in rain-fed systems remains imperative for improved farm level yields because the bulk of the food comes from rain-fed agriculture (FAO, 2008; Namara et al., 2010). However, increasing water scarcity and poor accessibility may become a limiting factor not only for agricultural production and the welfare of rural population but also for the entire economy. Improving the management of water resources and an efficient use of water by all sectors, including agricultural production, are therefore important if the welfare and health of the population, particularly in rural areas, are to be maintained and improved (Nyong & Kanaroglou, 1999).
- Full Text:
- Date Issued: 2013
- Authors: Nhundu, Kenneth
- Date: 2013
- Language: English
- Type: Thesis , Doctoral , PhD (Agricultural Economics)
- Identifier: vital:11195 , http://hdl.handle.net/10353/d1006784
- Description: Despite considerable advances in technology across the world, some scholars (Bratton, 1987; Namara et al., 2010) have argued that declining agricultural productivity among smallholder farmers in Africa remains a major bottleneck in the development of the continent. Unganai (1993) indicates that about 60% of the southern African region is semi-arid or arid and suffers from periodic droughts. In addition, World Bank (2003) notes that agricultural production is dominated by rain-fed agriculture and irrigation systems are limited. This is compounded by the scarcity and poor management of irrigation water resources. Water scarcity in agriculture has large impacts on the population, especially in rural areas, where more than 60 percent of the population are engaged in agriculture which represents their main source of food and income (FAO, 2008). On the macroeconomic level, agricultural share of the GDP is about 37 percent and 75 percent of the export value is generated from the agricultural sector globally. To this effect, management of agricultural water particularly in rain-fed systems remains imperative for improved farm level yields because the bulk of the food comes from rain-fed agriculture (FAO, 2008; Namara et al., 2010). However, increasing water scarcity and poor accessibility may become a limiting factor not only for agricultural production and the welfare of rural population but also for the entire economy. Improving the management of water resources and an efficient use of water by all sectors, including agricultural production, are therefore important if the welfare and health of the population, particularly in rural areas, are to be maintained and improved (Nyong & Kanaroglou, 1999).
- Full Text:
- Date Issued: 2013