The development of an arousal and anxiety control mental skills training programme for the Rhodes University archery club
- Authors: Chiweshe, Malvern Tatenda
- Date: 2013
- Subjects: Anxiety , Arousal , Mental skills , Training , Sports -- Psychological aspects -- Research -- South Africa , Archers -- Training of -- Research -- South Africa , Archers -- Psychological aspects -- Research -- South Africa , Psychology, Applied
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2917 , http://hdl.handle.net/10962/d1002082
- Description: Research on the development of Mental Skills Training (MST) programmes in sport psychology has largely increased as sport has become more competitive. MST programmes have been seen to improve the performance of athletes. This particular research study focuses on the development of an anxiety and arousal control MST programme designed specifically for, and tailored exclusively to, the needs of four archers from the Rhodes Archery Club in Grahamstown, Eastern Cape, South Africa. The development of the programme was guided by the Organisational Development Process model as the research methodology design. Data from two quantitative measures (CSAI-2 and Sport Grid-R), a focus group, and an individual interview were integrated with currently existing mental skills literature and theory to devise this particular MST programme. The results of the assessment phase showed that individual archers have different experiences in how anxiety and arousal affect their performances. The results also showed that archers have different zones in which they feel their performance is good. These zones depend on their subjective interpretations of anxiety and arousal. The results also showed that other factors that include personality differences, level of experience and level of expertise also influence how anxiety and arousal affect performance. The archers had previous exposure to MST programmes although they had not received systematic training in mental skills training. The programme was developed in the form of MST workshops that would run over a three week period. As part of the programme the archers would be given a mental skills manual to aid in the mental skills training. It is recommended in future that more research in MST programmes be done as a way of improving the performance of athletes in South Africa
- Full Text:
- Date Issued: 2013
- Authors: Chiweshe, Malvern Tatenda
- Date: 2013
- Subjects: Anxiety , Arousal , Mental skills , Training , Sports -- Psychological aspects -- Research -- South Africa , Archers -- Training of -- Research -- South Africa , Archers -- Psychological aspects -- Research -- South Africa , Psychology, Applied
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2917 , http://hdl.handle.net/10962/d1002082
- Description: Research on the development of Mental Skills Training (MST) programmes in sport psychology has largely increased as sport has become more competitive. MST programmes have been seen to improve the performance of athletes. This particular research study focuses on the development of an anxiety and arousal control MST programme designed specifically for, and tailored exclusively to, the needs of four archers from the Rhodes Archery Club in Grahamstown, Eastern Cape, South Africa. The development of the programme was guided by the Organisational Development Process model as the research methodology design. Data from two quantitative measures (CSAI-2 and Sport Grid-R), a focus group, and an individual interview were integrated with currently existing mental skills literature and theory to devise this particular MST programme. The results of the assessment phase showed that individual archers have different experiences in how anxiety and arousal affect their performances. The results also showed that archers have different zones in which they feel their performance is good. These zones depend on their subjective interpretations of anxiety and arousal. The results also showed that other factors that include personality differences, level of experience and level of expertise also influence how anxiety and arousal affect performance. The archers had previous exposure to MST programmes although they had not received systematic training in mental skills training. The programme was developed in the form of MST workshops that would run over a three week period. As part of the programme the archers would be given a mental skills manual to aid in the mental skills training. It is recommended in future that more research in MST programmes be done as a way of improving the performance of athletes in South Africa
- Full Text:
- Date Issued: 2013
An analysis of the financing mechanisms proposed for funding national health insurance in South Africa
- Authors: Stevens, Nicol Susan
- Date: 2012
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:888 , http://hdl.handle.net/10962/d1001642
- Description: In the 2011 Budget Speech, the Minister of Finance announced that South Africa would be introducing National Health Insurance. The Minister described the financing mechanisms under consideration for funding National Health Insurance. The Minister also referred to eight countries, namely Japan, South Korea, Taiwan, Chile, Colombia, Mexico, Thailand and Vietnam as examples of countries which had successfully implemented universal health coverage. These countries were selected for the purpose of the present research. The goal of this study was to analyse the health care financing mechanisms under consideration in South Africa to determine if they were in line with international trends and "best practice" in relation to South Africa's economic profile. To determine whether the economic situation in South Africa is comparable to the eight countries selected for the research, a high-level comparison was made of the economic profile of South Africa and the eight countries, based on certain demographic, macro-economic, health expenditure and health status indicators. The health care financing mechanisms used in the eight countries was also analysed. International trends suggested that health care should be financed primarily through pre-payment systems, that financing mechanisms should preferably be progressive in nature and that a large share of funding should be from government sources (albeit shared between general tax revenue and specific health care contributions). The financing mechanisms under consideration in South Africa reflect these norms. The health systems in the eight countries analysed all exhibited elements of "good performance" and also complied, to a large extent, with international trends, but the frnancing models used for funding health care in the eight countries were country-specific and could therefore not be compared directly or used to recommend a system for South Africa. Areas not addressed by this thesis include the implications of a centralised healthcare system, the implications of a single-payer system, the benefit package to be offered and its cost implications, the role of private healthcare providers and how the significant human resource scarcity and infrastructure backlogs will be addressed.
- Full Text:
- Date Issued: 2012
- Authors: Stevens, Nicol Susan
- Date: 2012
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:888 , http://hdl.handle.net/10962/d1001642
- Description: In the 2011 Budget Speech, the Minister of Finance announced that South Africa would be introducing National Health Insurance. The Minister described the financing mechanisms under consideration for funding National Health Insurance. The Minister also referred to eight countries, namely Japan, South Korea, Taiwan, Chile, Colombia, Mexico, Thailand and Vietnam as examples of countries which had successfully implemented universal health coverage. These countries were selected for the purpose of the present research. The goal of this study was to analyse the health care financing mechanisms under consideration in South Africa to determine if they were in line with international trends and "best practice" in relation to South Africa's economic profile. To determine whether the economic situation in South Africa is comparable to the eight countries selected for the research, a high-level comparison was made of the economic profile of South Africa and the eight countries, based on certain demographic, macro-economic, health expenditure and health status indicators. The health care financing mechanisms used in the eight countries was also analysed. International trends suggested that health care should be financed primarily through pre-payment systems, that financing mechanisms should preferably be progressive in nature and that a large share of funding should be from government sources (albeit shared between general tax revenue and specific health care contributions). The financing mechanisms under consideration in South Africa reflect these norms. The health systems in the eight countries analysed all exhibited elements of "good performance" and also complied, to a large extent, with international trends, but the frnancing models used for funding health care in the eight countries were country-specific and could therefore not be compared directly or used to recommend a system for South Africa. Areas not addressed by this thesis include the implications of a centralised healthcare system, the implications of a single-payer system, the benefit package to be offered and its cost implications, the role of private healthcare providers and how the significant human resource scarcity and infrastructure backlogs will be addressed.
- Full Text:
- Date Issued: 2012
An investigation into the use of Visual Technology for the Autonomous Learning of mathematics (VITALmaths) video clips through the medium of cell phones in the teaching of mathematics in selected South African Grade 9 classes: a case study
- Authors: Hyde, Janet Catherine
- Date: 2012
- Subjects: Mathematics -- Study and teaching (Secondary) -- South Africa Educational innovations -- South Africa Telecommunication in education -- South Africa Teaching -- South Africa -- Aids and devices
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1618 , http://hdl.handle.net/10962/d1003500
- Description: This qualitative study examines the use of Visual Technology for the Autonomous Learning of mathematics (VITALmaths) video clips in three Grade 9 classrooms in the Eastern Cape, South Africa, two of which are in well-resourced ex-Model C schools and one in a semi-rural township school. The rapid development of mobile technology, especially in Africa, has opened up previously unexplored avenues in economy, communication and education (Aker & Mbiti, 2010), with a number of mobile learning initiatives being launched in South Africa (Botha & Ford, 2007; Vosloo & Botha, 2009). The VITALmaths project was developed collaboratively between the University of Applied Sciences Northwestern Switzerland and Rhodes University in South Africa (Linneweber-Lammerskitten, Schäfer and Samson, 2010). As the main platform for dissemination of the video clips is the cell phone, the study looked at the various aspects involved in the use of cell phones by learners in the classroom, as well as the incorporation of the clips into the teaching of three teachers. Consideration was given to whether or not the clips assisted the teachers in teaching, as well as whether or not they encouraged further exploration. The study was divided into six stages during which data was collected and analysed using an interpretive approach throughout. Data collection methods included semistructured interviews, questionnaires, observation, journals and reflective essays. The study revealed the participating teachers, having incorporated the clips into several lessons, found that these had a meaningful effect on their teaching practice, as well as on the engagement of the learners in the lessons. The majority of the learners involved in the study had access to cell phones, either their own or borrowed, and were able to download the video clips onto their phones from the website (www.ru.ac.za/vitalmaths). A number of learners found that the clips helped them find examples of specific mathematical concepts outside of the classroom, thus leading to further enquiry and exploration, while several learners downloaded and viewed additional clips. Overall findings showed that the VITALmaths video clips could be incorporated into teaching with relative ease.
- Full Text:
- Date Issued: 2012
- Authors: Hyde, Janet Catherine
- Date: 2012
- Subjects: Mathematics -- Study and teaching (Secondary) -- South Africa Educational innovations -- South Africa Telecommunication in education -- South Africa Teaching -- South Africa -- Aids and devices
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1618 , http://hdl.handle.net/10962/d1003500
- Description: This qualitative study examines the use of Visual Technology for the Autonomous Learning of mathematics (VITALmaths) video clips in three Grade 9 classrooms in the Eastern Cape, South Africa, two of which are in well-resourced ex-Model C schools and one in a semi-rural township school. The rapid development of mobile technology, especially in Africa, has opened up previously unexplored avenues in economy, communication and education (Aker & Mbiti, 2010), with a number of mobile learning initiatives being launched in South Africa (Botha & Ford, 2007; Vosloo & Botha, 2009). The VITALmaths project was developed collaboratively between the University of Applied Sciences Northwestern Switzerland and Rhodes University in South Africa (Linneweber-Lammerskitten, Schäfer and Samson, 2010). As the main platform for dissemination of the video clips is the cell phone, the study looked at the various aspects involved in the use of cell phones by learners in the classroom, as well as the incorporation of the clips into the teaching of three teachers. Consideration was given to whether or not the clips assisted the teachers in teaching, as well as whether or not they encouraged further exploration. The study was divided into six stages during which data was collected and analysed using an interpretive approach throughout. Data collection methods included semistructured interviews, questionnaires, observation, journals and reflective essays. The study revealed the participating teachers, having incorporated the clips into several lessons, found that these had a meaningful effect on their teaching practice, as well as on the engagement of the learners in the lessons. The majority of the learners involved in the study had access to cell phones, either their own or borrowed, and were able to download the video clips onto their phones from the website (www.ru.ac.za/vitalmaths). A number of learners found that the clips helped them find examples of specific mathematical concepts outside of the classroom, thus leading to further enquiry and exploration, while several learners downloaded and viewed additional clips. Overall findings showed that the VITALmaths video clips could be incorporated into teaching with relative ease.
- Full Text:
- Date Issued: 2012
Queer transgressions : the choreographing of a male homosexual presence with reference to selected choreographers
- Authors: De Boer, Kyle Dylan
- Date: 2011
- Subjects: Queer theory , Gender identity in dance , Homosexuality in dance , Homosexuality and dance , Male homosexuality , Dance -- South Africa , Choreographers -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2161 , http://hdl.handle.net/10962/d1009442
- Description: Queer Transgressions: The choreographing of a male homosexual presence with reference to selected choreographers explores queer identity and in particular representations of a male homosexual presence in dance. Within the methodological framework of dance studies and queer theory I explore the ―self fashioning‖ of my male homosexual presence in dance. This is achieved by critically deconstructing my choreographic process when making choreography. Therefore this thesis is informed by both academic research and my self-reflexive experience of choreography and dance performance. The deconstruction of my autobiography and choreographic process is discussed with reference to both international and South African queer choreographers. This means that by accounting for my own experiences and approaches toward representing a male homosexual presence in dance, I explore the history and engagements of other queer choreographers also creating such representations. I therefore examine the works of selected choreographers and chart the development of the representation of a male homosexual presence in dance. By exploring the choreographic process of other queer choreographers I identify choreographic tactics that queer choreographers are using when making work. From this point of departure I shift the focus away from international queer choreographers and provide insight into the choreographic processes of South African queer choreographers. By accounting for the works and choreographic processes of South African choreographers, I provide a context in which my choreographic explorations on the subject matter can take place. This choreographic exploration manifests itself through a self-reflexive/autobiographic account on the research and practice of my choreographic process. During my choreographic exploration I set the challenge to both engage with and explore further, established ―queering tactics. This is done with the intention to reveal and create representations of a male homosexual presence in dance.
- Full Text:
- Date Issued: 2011
- Authors: De Boer, Kyle Dylan
- Date: 2011
- Subjects: Queer theory , Gender identity in dance , Homosexuality in dance , Homosexuality and dance , Male homosexuality , Dance -- South Africa , Choreographers -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2161 , http://hdl.handle.net/10962/d1009442
- Description: Queer Transgressions: The choreographing of a male homosexual presence with reference to selected choreographers explores queer identity and in particular representations of a male homosexual presence in dance. Within the methodological framework of dance studies and queer theory I explore the ―self fashioning‖ of my male homosexual presence in dance. This is achieved by critically deconstructing my choreographic process when making choreography. Therefore this thesis is informed by both academic research and my self-reflexive experience of choreography and dance performance. The deconstruction of my autobiography and choreographic process is discussed with reference to both international and South African queer choreographers. This means that by accounting for my own experiences and approaches toward representing a male homosexual presence in dance, I explore the history and engagements of other queer choreographers also creating such representations. I therefore examine the works of selected choreographers and chart the development of the representation of a male homosexual presence in dance. By exploring the choreographic process of other queer choreographers I identify choreographic tactics that queer choreographers are using when making work. From this point of departure I shift the focus away from international queer choreographers and provide insight into the choreographic processes of South African queer choreographers. By accounting for the works and choreographic processes of South African choreographers, I provide a context in which my choreographic explorations on the subject matter can take place. This choreographic exploration manifests itself through a self-reflexive/autobiographic account on the research and practice of my choreographic process. During my choreographic exploration I set the challenge to both engage with and explore further, established ―queering tactics. This is done with the intention to reveal and create representations of a male homosexual presence in dance.
- Full Text:
- Date Issued: 2011
"The secret rapport between photography and philosophy" considering the South African photographic apparatus through Veleko, Rose, Goldblatt, Ractliffe and Mofokeng
- Authors: Mountain, Michelle Fiona
- Date: 2010
- Subjects: Veleko, Nontsikelelo Rose, Tracy Goldblatt, David Ractliffe, Jo 1961- Mofokeng, Santu, 1956- Photographers -- South Africa Photography -- Philosophy Photography -- Social aspects -- South Africa Apartheid in art Documentary photography -- South Africa Space (Art) -- South Africa South Africa Social conditions
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2415 , http://hdl.handle.net/10962/d1002211
- Description: This thesis is an attempt at understanding South African photography through the lens of Nontsikelelo “Lolo” Veleko, Tracy Rose, David Goldblatt, Jo Ractliffe and Santu Mofokeng. Through the works discussed this thesis intends to unpack photography as a complex medium similar to that of language and text, as well as attempt to understand how exploring South African experiences and spaces through the lens of photography shapes and mediates them. Furthermore it also attempts to understand how these experiences and spaces conversely affect the discourse of photography or at the very least our perception of it. Through these photographers and their works it is hoped that ultimately the interconnected relationship of exchanging codes that takes place between photography and society will be highlighted. The example of connectivity or dialogue I believe exists between the medium of photography and the physical/social and psychological spaces it photographs will be mediated through Deleuze and Guattari‟s conception of “the wasp and the orchid” where “the wasp becomes the orchid, just as the orchid becomes the wasp...an exchanging or capturing of each other‟s codes”. Other theorists I will be looking at include Vilém Flusser, focusing in particular on his book Towards a Philosophy of Photography, as well as Susan Sontag, Roland Barthes and others. The main aims and objectives of this thesis are to understand the veracity of the documentary image and whether or not the image harbours any objective truth, as well as whether truth, if it can truly be said to exist in the world, resides between the camera and the seen world. This dichotomy is further complicated by the matter of subject-hood and technical and philosophical understandings of the camera as an apparatus. At no point do I aim to be conclusive, rather it is hoped that by developing the dynamic tension between the theory and the image world that I will be able to bring fresh insight into the reading of a changing South African condition and the subject position of the photographer in relation to this condition.
- Full Text:
- Date Issued: 2010
- Authors: Mountain, Michelle Fiona
- Date: 2010
- Subjects: Veleko, Nontsikelelo Rose, Tracy Goldblatt, David Ractliffe, Jo 1961- Mofokeng, Santu, 1956- Photographers -- South Africa Photography -- Philosophy Photography -- Social aspects -- South Africa Apartheid in art Documentary photography -- South Africa Space (Art) -- South Africa South Africa Social conditions
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2415 , http://hdl.handle.net/10962/d1002211
- Description: This thesis is an attempt at understanding South African photography through the lens of Nontsikelelo “Lolo” Veleko, Tracy Rose, David Goldblatt, Jo Ractliffe and Santu Mofokeng. Through the works discussed this thesis intends to unpack photography as a complex medium similar to that of language and text, as well as attempt to understand how exploring South African experiences and spaces through the lens of photography shapes and mediates them. Furthermore it also attempts to understand how these experiences and spaces conversely affect the discourse of photography or at the very least our perception of it. Through these photographers and their works it is hoped that ultimately the interconnected relationship of exchanging codes that takes place between photography and society will be highlighted. The example of connectivity or dialogue I believe exists between the medium of photography and the physical/social and psychological spaces it photographs will be mediated through Deleuze and Guattari‟s conception of “the wasp and the orchid” where “the wasp becomes the orchid, just as the orchid becomes the wasp...an exchanging or capturing of each other‟s codes”. Other theorists I will be looking at include Vilém Flusser, focusing in particular on his book Towards a Philosophy of Photography, as well as Susan Sontag, Roland Barthes and others. The main aims and objectives of this thesis are to understand the veracity of the documentary image and whether or not the image harbours any objective truth, as well as whether truth, if it can truly be said to exist in the world, resides between the camera and the seen world. This dichotomy is further complicated by the matter of subject-hood and technical and philosophical understandings of the camera as an apparatus. At no point do I aim to be conclusive, rather it is hoped that by developing the dynamic tension between the theory and the image world that I will be able to bring fresh insight into the reading of a changing South African condition and the subject position of the photographer in relation to this condition.
- Full Text:
- Date Issued: 2010
A model for information security control audit for small to mid-sized organisations
- Authors: Deysel, Natasha
- Date: 2009
- Subjects: Data protection , Computer networks -- Information technology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9760 , http://hdl.handle.net/10948/940 , Data protection , Computer networks -- Information technology
- Description: Organisations are increasingly dependent on their information. Compromise to this information in terms of loss, inaccuracy or competitors gaining unauthorised access could have devastating consequences for the organisation. Therefore, information security governance has become a major concern for all organisations, large and small. Information security governance is based on a set of policies and internal controls by which organisations direct and manage their information security. An effective information security governance programme should be based on a recognised framework, such as the Control Objectives for Information and related Technology (COBIT). COBIT focuses on what control objectives must be achieved in order to effectively manage the information technology environment. It has become very clear that if a company is serious about information security governance, it needs to apply the COBIT framework that deals with information security. The problem in some medium-sized organisations is that they do not realise the importance of information security governance and are either unaware of the risks or choose to ignore these risks as they do not have the expertise or resources available to provide them with assurance that they have the right information security controls in place to protect their organisation against threats.
- Full Text:
- Date Issued: 2009
- Authors: Deysel, Natasha
- Date: 2009
- Subjects: Data protection , Computer networks -- Information technology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9760 , http://hdl.handle.net/10948/940 , Data protection , Computer networks -- Information technology
- Description: Organisations are increasingly dependent on their information. Compromise to this information in terms of loss, inaccuracy or competitors gaining unauthorised access could have devastating consequences for the organisation. Therefore, information security governance has become a major concern for all organisations, large and small. Information security governance is based on a set of policies and internal controls by which organisations direct and manage their information security. An effective information security governance programme should be based on a recognised framework, such as the Control Objectives for Information and related Technology (COBIT). COBIT focuses on what control objectives must be achieved in order to effectively manage the information technology environment. It has become very clear that if a company is serious about information security governance, it needs to apply the COBIT framework that deals with information security. The problem in some medium-sized organisations is that they do not realise the importance of information security governance and are either unaware of the risks or choose to ignore these risks as they do not have the expertise or resources available to provide them with assurance that they have the right information security controls in place to protect their organisation against threats.
- Full Text:
- Date Issued: 2009
The role of values in educational leadership: an interpretive study
- Authors: Drake, Melanie Lee
- Date: 2008
- Subjects: Educational leadership -- South Africa Leadership -- South Africa Values -- Study and teaching -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1756 , http://hdl.handle.net/10962/d1003640
- Description: This study set out to investigate the role of values in educational leadership. The renewed interest in values in both educational and corporate environments in South Africa places new pressures on members in leadership positions especially in school life. Schools are described as the ‘nurseries’ of values. The understanding of the abstract nature of values, as well as instrumentalising and implementing values in vision statements and organisational life, poses challenges to present and future school leaders. This study, based in the interpretive paradigm, is an in-depth investigation into the role of values at a former model C primary school in the Eastern Cape. Through the use of observations, document analysis, focus groups and interviews as data collection tools, this research highlights the importance of values in school leadership and how this impacts the life of the school leader. This case-study research combines theoretical and contextual frameworks to question the nature of values in leadership and uses the real-life experiences of these school leaders to resonate with current understandings of values in leadership and organisational culture. The importance of understanding these complexities in the lives and experiences of these school leaders cannot be underestimated. My findings highlight the tensions between leading successful schools (task/person efficiency) and remaining congruent with the need for leadership for social justice in post-apartheid educational institutions. The uniqueness of the school environment (‘families’ and ‘communities’) is also featured and resonates with previous literature. Through the lens of emerging leadership trends, we discover these school leaders’ understandings of values in their daily lives: they do what they are and this is reflected in this school’s unique organisational culture, which could be said to ‘transcend’ present leaders’ influence. Finally I propose that further research is necessary in order to broaden our understanding of the unique role of values in educational leadership in South Africa.
- Full Text:
- Date Issued: 2008
- Authors: Drake, Melanie Lee
- Date: 2008
- Subjects: Educational leadership -- South Africa Leadership -- South Africa Values -- Study and teaching -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1756 , http://hdl.handle.net/10962/d1003640
- Description: This study set out to investigate the role of values in educational leadership. The renewed interest in values in both educational and corporate environments in South Africa places new pressures on members in leadership positions especially in school life. Schools are described as the ‘nurseries’ of values. The understanding of the abstract nature of values, as well as instrumentalising and implementing values in vision statements and organisational life, poses challenges to present and future school leaders. This study, based in the interpretive paradigm, is an in-depth investigation into the role of values at a former model C primary school in the Eastern Cape. Through the use of observations, document analysis, focus groups and interviews as data collection tools, this research highlights the importance of values in school leadership and how this impacts the life of the school leader. This case-study research combines theoretical and contextual frameworks to question the nature of values in leadership and uses the real-life experiences of these school leaders to resonate with current understandings of values in leadership and organisational culture. The importance of understanding these complexities in the lives and experiences of these school leaders cannot be underestimated. My findings highlight the tensions between leading successful schools (task/person efficiency) and remaining congruent with the need for leadership for social justice in post-apartheid educational institutions. The uniqueness of the school environment (‘families’ and ‘communities’) is also featured and resonates with previous literature. Through the lens of emerging leadership trends, we discover these school leaders’ understandings of values in their daily lives: they do what they are and this is reflected in this school’s unique organisational culture, which could be said to ‘transcend’ present leaders’ influence. Finally I propose that further research is necessary in order to broaden our understanding of the unique role of values in educational leadership in South Africa.
- Full Text:
- Date Issued: 2008
Multi-income level investment in golf estates
- Authors: Ngubeni, Steven Piet
- Date: 2007
- Subjects: Real estate development , Sustainable development -- South Africa , Housing development -- South Africa , Planned communities
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9694 , http://hdl.handle.net/10948/771 , Real estate development , Sustainable development -- South Africa , Housing development -- South Africa , Planned communities
- Description: The government of South African has stated its intentions to enforce a policy which will compel developers of upmarket residential properties to set aside 20 percent of their upmarket residential developments to accommodate affordable housing. The developers on the other hand, have expressed concerns about this approach. The principal aim of this study and of the research was to investigate the desirability of the concept of multi-income-level investment approach to the development of golf estates. A phenomenological strand of qualitative research method was used in the research. The following formed the focal point of the research: • An investigation into the perceptions of the stakeholders, especially the buyers of up-market properties, about mixed-income-level investments in golf estates. • The potential effect of the implementation of including affordable housing in the development of golf estates • An investigation of the perceived effect on the profitability of investments by the inclusion of affordable housing in golf estate properties. • The extent of the contribution of including affordable housing in golf estate developments to the reduction of the current backlog
- Full Text:
- Date Issued: 2007
- Authors: Ngubeni, Steven Piet
- Date: 2007
- Subjects: Real estate development , Sustainable development -- South Africa , Housing development -- South Africa , Planned communities
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9694 , http://hdl.handle.net/10948/771 , Real estate development , Sustainable development -- South Africa , Housing development -- South Africa , Planned communities
- Description: The government of South African has stated its intentions to enforce a policy which will compel developers of upmarket residential properties to set aside 20 percent of their upmarket residential developments to accommodate affordable housing. The developers on the other hand, have expressed concerns about this approach. The principal aim of this study and of the research was to investigate the desirability of the concept of multi-income-level investment approach to the development of golf estates. A phenomenological strand of qualitative research method was used in the research. The following formed the focal point of the research: • An investigation into the perceptions of the stakeholders, especially the buyers of up-market properties, about mixed-income-level investments in golf estates. • The potential effect of the implementation of including affordable housing in the development of golf estates • An investigation of the perceived effect on the profitability of investments by the inclusion of affordable housing in golf estate properties. • The extent of the contribution of including affordable housing in golf estate developments to the reduction of the current backlog
- Full Text:
- Date Issued: 2007
Opportunities for eco-efficiency at Summerpride Foods Ltd.: a pineapple processing factory
- Venters, Bruce Russell Ainsley
- Authors: Venters, Bruce Russell Ainsley
- Date: 2007
- Subjects: Summerpride Foods Ltd. (South Africa) Environmental protection -- South Africa Industries -- Environmental aspects -- South Africa Pineapple industry -- South Africa Environmental policy -- South Africa Sustainable development -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:787 , http://hdl.handle.net/10962/d1003908
- Description: International awareness and demands for the protection of the environment by the public on industry has only been pushed into the limelight in the past couple of decades. Prior to this it could be argued that it was accepted that environmental protection and economic development were at odds. However it has since been recognised that there is a need to achieve environmental sustainability, the concept of which was released in the 1987 Brundtland Report released by the United Nations. There are a number of ways that industry can reduce its impact on the environment and thus help reach this goal. While some advocated that stricter legislation would result in greater innovation by industry in “cleaning-up” its act, such as the Porter Hypothesis, there were also a number of new concepts and voluntary industry codes being developed. These new practices and codes have been promoted by organisations such as the International Chamber of Commerce and include technological improvements within organisations and improved resource productivity. The aim of this case study research was to find out what the environmental policy and related performance of Summerpride Foods Ltd, a pineapple processing factory in East London was and does an understanding of its environmental performance provide insights for improved efficiency. This involved the identification and analysis of what resources were used during the processing of pineapples as well as making recommendations that would result in increased efficiencies of their use. Due to the number of resources identified, only the use of water and coal which were ranked as having the highest impact were investigated further. The literature review showed that there are industry moves to applying cleaner production and eco-efficiency concepts as a means to attaining environmental sustainability. There are a number of voluntary environmental management system standards and codes that organisations can subscribe to with most probably the ISO 14001 standard being the most internationally recognised. There are many benefits to organisations adopting such standards. The use of lifecycle assessments is a useful tool that can be used to assess the environmental impact of a product through its entire life and thus enable one to identify all resources used and their impact, as well as to provide the information required to quantify areas where the greatest improvements can be made. The results of this research showed that at the start of the study, there was no formal environmental policy in place at Summerpride Foods Ltd and that this was starting to become a requirement with some customers. The detailed results which focused on water and coal usage showed that current operating methods do not recognise the importance of any wastage and that there are a number of changes that could be made that would not only result in better efficiency of use but would also result in substantial financial savings to the organisation. Summerpride Foods Ltd currently has a number of systems in place that help reduce its impact on the environment but these are not formally recorded. Summerpride Foods Ltd should adopt the principles of eco-efficiency and record all systems that impact on the environment. This would be the first step to attaining a formal environmental management system accreditation which due the increasing competitiveness of the international market in which Summerpride Foods Ltd operates, would give it a degree of advantage over those competing pineapples processing factories that do not have such accreditation.
- Full Text:
- Date Issued: 2007
- Authors: Venters, Bruce Russell Ainsley
- Date: 2007
- Subjects: Summerpride Foods Ltd. (South Africa) Environmental protection -- South Africa Industries -- Environmental aspects -- South Africa Pineapple industry -- South Africa Environmental policy -- South Africa Sustainable development -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:787 , http://hdl.handle.net/10962/d1003908
- Description: International awareness and demands for the protection of the environment by the public on industry has only been pushed into the limelight in the past couple of decades. Prior to this it could be argued that it was accepted that environmental protection and economic development were at odds. However it has since been recognised that there is a need to achieve environmental sustainability, the concept of which was released in the 1987 Brundtland Report released by the United Nations. There are a number of ways that industry can reduce its impact on the environment and thus help reach this goal. While some advocated that stricter legislation would result in greater innovation by industry in “cleaning-up” its act, such as the Porter Hypothesis, there were also a number of new concepts and voluntary industry codes being developed. These new practices and codes have been promoted by organisations such as the International Chamber of Commerce and include technological improvements within organisations and improved resource productivity. The aim of this case study research was to find out what the environmental policy and related performance of Summerpride Foods Ltd, a pineapple processing factory in East London was and does an understanding of its environmental performance provide insights for improved efficiency. This involved the identification and analysis of what resources were used during the processing of pineapples as well as making recommendations that would result in increased efficiencies of their use. Due to the number of resources identified, only the use of water and coal which were ranked as having the highest impact were investigated further. The literature review showed that there are industry moves to applying cleaner production and eco-efficiency concepts as a means to attaining environmental sustainability. There are a number of voluntary environmental management system standards and codes that organisations can subscribe to with most probably the ISO 14001 standard being the most internationally recognised. There are many benefits to organisations adopting such standards. The use of lifecycle assessments is a useful tool that can be used to assess the environmental impact of a product through its entire life and thus enable one to identify all resources used and their impact, as well as to provide the information required to quantify areas where the greatest improvements can be made. The results of this research showed that at the start of the study, there was no formal environmental policy in place at Summerpride Foods Ltd and that this was starting to become a requirement with some customers. The detailed results which focused on water and coal usage showed that current operating methods do not recognise the importance of any wastage and that there are a number of changes that could be made that would not only result in better efficiency of use but would also result in substantial financial savings to the organisation. Summerpride Foods Ltd currently has a number of systems in place that help reduce its impact on the environment but these are not formally recorded. Summerpride Foods Ltd should adopt the principles of eco-efficiency and record all systems that impact on the environment. This would be the first step to attaining a formal environmental management system accreditation which due the increasing competitiveness of the international market in which Summerpride Foods Ltd operates, would give it a degree of advantage over those competing pineapples processing factories that do not have such accreditation.
- Full Text:
- Date Issued: 2007
Hidden presences in the spirituality of the amaXhosa of the Eastern Cape and the impact of Christianity on them
- Authors: Mtuze, P T
- Date: 2000
- Subjects: Spirituality -- South Africa -- Eastern Cape , Xhosa (African people) -- Religion , Missions -- South Africa -- Eastern Cape , Missionaries -- South Africa -- Eastern Cape , Christianity -- South Africa -- Eastern Cape -- History , Christianity and culture -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1296 , http://hdl.handle.net/10962/d1015612
- Description: This thesis is an attempt to reopen the debate on the whole question of inculturation in Southern Africa especially in light of the fact that we are now in a multi-lingual and multi-religious state. It is an attempt to rehighlight the plight of the spirituality of the amaXhosa people over the last century when missionary and imperial onslaught relegated it to the doldrums. This plunged the amaXhosa in a crisis that has left them directionless, to put it mildly. This is said because the total onslaught destroyed their self-respect and their identity and begs the question as to whether their acceptability to God was contingent on renouncing their culture especially the hidden presences - Qamata, the living-dead and the notion of evil spirits. It is precisely because of these misconceptions regarding African culture and spirituality that the thesis has a strong expository and apologetic bias primarily aimed to address, and put into proper perspective, the significance of the Supreme Being, the living-dead and the evil spirits in African culture. The issues are discussed within the broader socio-historical context. The thesis is basically comparative in that it uses Celtic spirituality and the approach of the early Celtic church to the question of inculturation as its point of departure and as a foil against which the preposterous actions of the church in Africa should be seen. This comparative element is also reflected in the unmistakable `dichotomy’ of Western religion and African spirituality, or better still, lack of spirituality, that was so fervently maintained by the missionaries and the colonialists alike. It is for this reason that I concur with Chidester (1996:xiv) that `the study of religion must find itself, once again, on the frontier’. The study is informed by this approach right through. It should be stressed, from the outset, that the idea is not comparison in order to satisfy our curiosity, nor is it comparison in order to try to authenticate and vindicate the beleaguered African culture. The central idea of the study is to expose the absurdity of the policies of the past century in this regard. The myth of the pure blooded Christianity is confronted, if not exploded. Several examples of both inculturation and continuities between Christianity and other faiths such as the Jewish founding faith are given. The subtheme of cultural domination subtly spans the whole study culminating in Chapter Four where the blacks begin to appropriate some of the Christian symbols and the whites also begin to assimilate African concepts such as ubuntu.
- Full Text:
- Date Issued: 2000
- Authors: Mtuze, P T
- Date: 2000
- Subjects: Spirituality -- South Africa -- Eastern Cape , Xhosa (African people) -- Religion , Missions -- South Africa -- Eastern Cape , Missionaries -- South Africa -- Eastern Cape , Christianity -- South Africa -- Eastern Cape -- History , Christianity and culture -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1296 , http://hdl.handle.net/10962/d1015612
- Description: This thesis is an attempt to reopen the debate on the whole question of inculturation in Southern Africa especially in light of the fact that we are now in a multi-lingual and multi-religious state. It is an attempt to rehighlight the plight of the spirituality of the amaXhosa people over the last century when missionary and imperial onslaught relegated it to the doldrums. This plunged the amaXhosa in a crisis that has left them directionless, to put it mildly. This is said because the total onslaught destroyed their self-respect and their identity and begs the question as to whether their acceptability to God was contingent on renouncing their culture especially the hidden presences - Qamata, the living-dead and the notion of evil spirits. It is precisely because of these misconceptions regarding African culture and spirituality that the thesis has a strong expository and apologetic bias primarily aimed to address, and put into proper perspective, the significance of the Supreme Being, the living-dead and the evil spirits in African culture. The issues are discussed within the broader socio-historical context. The thesis is basically comparative in that it uses Celtic spirituality and the approach of the early Celtic church to the question of inculturation as its point of departure and as a foil against which the preposterous actions of the church in Africa should be seen. This comparative element is also reflected in the unmistakable `dichotomy’ of Western religion and African spirituality, or better still, lack of spirituality, that was so fervently maintained by the missionaries and the colonialists alike. It is for this reason that I concur with Chidester (1996:xiv) that `the study of religion must find itself, once again, on the frontier’. The study is informed by this approach right through. It should be stressed, from the outset, that the idea is not comparison in order to satisfy our curiosity, nor is it comparison in order to try to authenticate and vindicate the beleaguered African culture. The central idea of the study is to expose the absurdity of the policies of the past century in this regard. The myth of the pure blooded Christianity is confronted, if not exploded. Several examples of both inculturation and continuities between Christianity and other faiths such as the Jewish founding faith are given. The subtheme of cultural domination subtly spans the whole study culminating in Chapter Four where the blacks begin to appropriate some of the Christian symbols and the whites also begin to assimilate African concepts such as ubuntu.
- Full Text:
- Date Issued: 2000
The influence of oceanographic conditions and culture methods on the dynamics of mussel farming in Saldanha Bay, South Africa
- Authors: Heasman, Kevin Gerald
- Date: 1996
- Subjects: Mytilidae -- South Africa , Mussel culture -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5290 , http://hdl.handle.net/10962/d1005134 , Mytilidae -- South Africa , Mussel culture -- South Africa
- Description: The principal aim of this study was to establish the biological and environmental parameters governing the successful and sustainable cultivation of mussels in Saldanha Bay. The environmental study investigated seston, chlorophyll-a and particulate organic matter (POM) levels, water temperature dissolved oxygen and salinity levels in the bay and water flow in and around the rafts. The biological part of the study investigated the efficiency of food extraction, growth rates, mussel condition, fouling and production and yield on a rope, raft and farm scale. Saldanha Bay is well suited for the culture of mussels, particularly Mytilus galloprovincialis and Choromytilus meridionalis. Water temperature and salinity in Saldanha Bay were found to be near optimal for mussel culture. POM and chlorophyll-a levels were found to be high due to primary production resulting from the nutrient rich upwelled water outside Saldanha Bay. The mean levels of chlorophyll-a (8,6μg/l) represent 6%, by mass, of the total POM. On a bay scale the POM remained above the mussels maximum requirements (pseudofaeces threshold) during the study period. Mussels showed a preference for the phytoplankton portion of the POM. Approximately 40% of the chlorophyll-a was extracted from the water by the mussel farm. The efficiency of food extraction increased with mussel age. Rafts with seed mussels younger than 2 months, 3 to 4 months, 5 to 6 months and older than 6 months extracted 32%, 55%, 85% and 92% of the available chlorophyll-a respectively. An increase of rope spacing on the rafts resulted in 37% more chlorophyll-a and 30% more particle volume reaching the lee of the raft. Ambient water currents in the bay show flow rates of up to 22cm per second. However, on entering a raft with a rope spacing of 60cm, the water flow is attenuated by 90%. Increasing the rope spacing to 90cm resulted in a water flow attenuation of 72%. The increase in rope spacing ensures that the mussels in the centre of the raft are feeding on food levels close to, or above, the pseudofaeces level. Mussel growth rate at a rope spacing of 90cm is significantly improved as a result of the increased food delivery. There are other factors, however that effect mussel growth. Growth rates were found to be better in summer than in winter. The reduced winter growth rate is possibly due to competition with the maturing fouling organisms which settle in mid to late summer. Fouling by mussel spat and Ciona intestinalis is seasonal, occurring from December to May. C.intestinalis is prevalent in the centre of the farm and rafts as low energy waters are preferred by this species. Mussel spat settles mainly on the periphery of the farm and the rafts. Competition with fouling organisms reduces growth and increases mortality of the cultured mussels. Results indicate that the present spacing of rafts, (1 raft per hectare) is adequate under existing conditions. Any new farms should maintain batches of 50 rafts with channels between them to ensure water current penetration into the furthest reaches of the farm. Rope spacing on the rafts should be increased to between 60cm and 90cm. Mussel density should be regulated according to mussel size and fouling should be controlled to maintain yields.
- Full Text:
- Date Issued: 1996
- Authors: Heasman, Kevin Gerald
- Date: 1996
- Subjects: Mytilidae -- South Africa , Mussel culture -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5290 , http://hdl.handle.net/10962/d1005134 , Mytilidae -- South Africa , Mussel culture -- South Africa
- Description: The principal aim of this study was to establish the biological and environmental parameters governing the successful and sustainable cultivation of mussels in Saldanha Bay. The environmental study investigated seston, chlorophyll-a and particulate organic matter (POM) levels, water temperature dissolved oxygen and salinity levels in the bay and water flow in and around the rafts. The biological part of the study investigated the efficiency of food extraction, growth rates, mussel condition, fouling and production and yield on a rope, raft and farm scale. Saldanha Bay is well suited for the culture of mussels, particularly Mytilus galloprovincialis and Choromytilus meridionalis. Water temperature and salinity in Saldanha Bay were found to be near optimal for mussel culture. POM and chlorophyll-a levels were found to be high due to primary production resulting from the nutrient rich upwelled water outside Saldanha Bay. The mean levels of chlorophyll-a (8,6μg/l) represent 6%, by mass, of the total POM. On a bay scale the POM remained above the mussels maximum requirements (pseudofaeces threshold) during the study period. Mussels showed a preference for the phytoplankton portion of the POM. Approximately 40% of the chlorophyll-a was extracted from the water by the mussel farm. The efficiency of food extraction increased with mussel age. Rafts with seed mussels younger than 2 months, 3 to 4 months, 5 to 6 months and older than 6 months extracted 32%, 55%, 85% and 92% of the available chlorophyll-a respectively. An increase of rope spacing on the rafts resulted in 37% more chlorophyll-a and 30% more particle volume reaching the lee of the raft. Ambient water currents in the bay show flow rates of up to 22cm per second. However, on entering a raft with a rope spacing of 60cm, the water flow is attenuated by 90%. Increasing the rope spacing to 90cm resulted in a water flow attenuation of 72%. The increase in rope spacing ensures that the mussels in the centre of the raft are feeding on food levels close to, or above, the pseudofaeces level. Mussel growth rate at a rope spacing of 90cm is significantly improved as a result of the increased food delivery. There are other factors, however that effect mussel growth. Growth rates were found to be better in summer than in winter. The reduced winter growth rate is possibly due to competition with the maturing fouling organisms which settle in mid to late summer. Fouling by mussel spat and Ciona intestinalis is seasonal, occurring from December to May. C.intestinalis is prevalent in the centre of the farm and rafts as low energy waters are preferred by this species. Mussel spat settles mainly on the periphery of the farm and the rafts. Competition with fouling organisms reduces growth and increases mortality of the cultured mussels. Results indicate that the present spacing of rafts, (1 raft per hectare) is adequate under existing conditions. Any new farms should maintain batches of 50 rafts with channels between them to ensure water current penetration into the furthest reaches of the farm. Rope spacing on the rafts should be increased to between 60cm and 90cm. Mussel density should be regulated according to mussel size and fouling should be controlled to maintain yields.
- Full Text:
- Date Issued: 1996
The observation of extended sources with the Hartebeesthoek radio telescope
- Authors: Mountfort, Peter Ian
- Date: 1990
- Subjects: Radio telescopes
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5479 , http://hdl.handle.net/10962/d1005265
- Description: The Hartebeesthoek Radio Telescope is well suited to mapping large areas of sky at 2.3 GHz because of the stability and sensitivity of the noise-adding radiometer (Nicolson, 1970) and cryogenic amplifier used at this frequency, the relatively large 20' beam of the 26 m dish antenna, and its high-speed drive capability. Telescope control programs were written for the Observatory's online computer for automated mapping. Effort centred on removing the curved baseline or 'background' from each Declination (Dec) scan, due to atmospheric and ground radiation contributions varying as the antenna is scanned. Initially these backgrounds were measured over a wide range of Hour Angle (HA) for the Dec range of a map, and an interpolated curve subtracted from each on-source scan for its HA. A common base level was established by comparison with drift scans (observed with the antenna stationary). These different observations (on- and off-source Dec scans and drift scans) were combined into one in the Skymap system by performing Dec scans at a fixed starting HA for a period long enough to permit 'cold sky' and the source to drift through. A background formed by fitting a smooth curve through the lowest sample at each Dec provides a consistent relative base level for all the scans in an observation. A high scanning speed is used so that observations may fruitfully be repeated three times and interleaved to build a reliable, fully sampled map. As each observation has its own background removed, it may be made at any HA. For comparison, maps of Upper Scorpio produced by the earlier method (Baart et al., 1980) and the Magellanic Cloud region produced by Skymap (Mountfort et al., 1987) are shown. Skymap provides a simple and flexible mapping method which relies on the stability of the noise-adding radiometer and high-speed repeated scans to produce good maps of large or small extent with little computation. Correction for drift is more difficult than with systems which use intersecting scans, such as the 'nodding' scans used by Haslam et al. (1981) or the Azimuth scans of Reich (1982).
- Full Text:
- Date Issued: 1990
- Authors: Mountfort, Peter Ian
- Date: 1990
- Subjects: Radio telescopes
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5479 , http://hdl.handle.net/10962/d1005265
- Description: The Hartebeesthoek Radio Telescope is well suited to mapping large areas of sky at 2.3 GHz because of the stability and sensitivity of the noise-adding radiometer (Nicolson, 1970) and cryogenic amplifier used at this frequency, the relatively large 20' beam of the 26 m dish antenna, and its high-speed drive capability. Telescope control programs were written for the Observatory's online computer for automated mapping. Effort centred on removing the curved baseline or 'background' from each Declination (Dec) scan, due to atmospheric and ground radiation contributions varying as the antenna is scanned. Initially these backgrounds were measured over a wide range of Hour Angle (HA) for the Dec range of a map, and an interpolated curve subtracted from each on-source scan for its HA. A common base level was established by comparison with drift scans (observed with the antenna stationary). These different observations (on- and off-source Dec scans and drift scans) were combined into one in the Skymap system by performing Dec scans at a fixed starting HA for a period long enough to permit 'cold sky' and the source to drift through. A background formed by fitting a smooth curve through the lowest sample at each Dec provides a consistent relative base level for all the scans in an observation. A high scanning speed is used so that observations may fruitfully be repeated three times and interleaved to build a reliable, fully sampled map. As each observation has its own background removed, it may be made at any HA. For comparison, maps of Upper Scorpio produced by the earlier method (Baart et al., 1980) and the Magellanic Cloud region produced by Skymap (Mountfort et al., 1987) are shown. Skymap provides a simple and flexible mapping method which relies on the stability of the noise-adding radiometer and high-speed repeated scans to produce good maps of large or small extent with little computation. Correction for drift is more difficult than with systems which use intersecting scans, such as the 'nodding' scans used by Haslam et al. (1981) or the Azimuth scans of Reich (1982).
- Full Text:
- Date Issued: 1990
Seasonal changes in the physiological and hormonal aspects of reproduction in the male long-fingered bat, Miniopterus schreibersii (Mammalia : Chiroptera)
- Authors: Paton, Joy Carol
- Date: 1989
- Subjects: Bats -- Reproduction
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5590 , http://hdl.handle.net/10962/d1002040
- Description: The reproductive cycle of Miniopterus schreibersii is modified as a consequence of a period of torpor/hibernation over the winter months. This bat is one of three genera which employ the reproductive strategy of delayed implantation in which the blastocyst remains free in the uterine lumen during the winter months. Spermatogenesis is initiated in February, with spermiogenesis occuring in March. Copulation, ovulation and fertilization takes place between March and May after which the testes regress and remain in an inactive condition until the following summer. Activity in the accessory gland complex is initiated in March and continues until early June. Plasma testosterone concentrations reach a peak in May, decline over the winter months and reach a second, unexplainable peak in October. Leydig cells are secretorily active in February/early March after which they undergo vacuolation and final degeneration. The question of the life cyle of Leydig cells is addressed and an increase in a certain cell after Leydig cell activity suggests that this cell type may be the precursor of Leydig cells.
- Full Text:
- Date Issued: 1989
- Authors: Paton, Joy Carol
- Date: 1989
- Subjects: Bats -- Reproduction
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5590 , http://hdl.handle.net/10962/d1002040
- Description: The reproductive cycle of Miniopterus schreibersii is modified as a consequence of a period of torpor/hibernation over the winter months. This bat is one of three genera which employ the reproductive strategy of delayed implantation in which the blastocyst remains free in the uterine lumen during the winter months. Spermatogenesis is initiated in February, with spermiogenesis occuring in March. Copulation, ovulation and fertilization takes place between March and May after which the testes regress and remain in an inactive condition until the following summer. Activity in the accessory gland complex is initiated in March and continues until early June. Plasma testosterone concentrations reach a peak in May, decline over the winter months and reach a second, unexplainable peak in October. Leydig cells are secretorily active in February/early March after which they undergo vacuolation and final degeneration. The question of the life cyle of Leydig cells is addressed and an increase in a certain cell after Leydig cell activity suggests that this cell type may be the precursor of Leydig cells.
- Full Text:
- Date Issued: 1989
A contribution towards an understanding of the intensive tank culture of an ornamental Cichlid, Aulonocara Baenschi, from Chipoka, Lake Malawi
- Authors: Impson, N D (Neville Dean)
- Date: 1988
- Subjects: Cichlids -- Nysas, Lake , Cichlids -- Nyasa, Lake -- Physiology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5208 , http://hdl.handle.net/10962/d1004596 , Cichlids -- Nysas, Lake , Cichlids -- Nyasa, Lake -- Physiology
- Description: The intensive tank culture of ornamental mouthbrooding cichlids poses several problems which limit their aquaculture potential. This project addressed some of these problems for Aulonocara baenschi. The production of juveniles in 2501 aquaria was accelerated when: a) aquaria were equipped with refuges, b) females of less than 70mm in standard length were used as broodstock, c) mouthbrooding females were replaced with gravid females at seven day intervals, and d) embryos were removed from the mouths of females at replacement times for artificial incubation. Two sex ratios also accelerated juvenile production. The sex ratio (male:females) 1:30 yielded the highest spawning returns per tank, and therefore represented the most effective utilization of aquarium space (a critical consideration for the small-scale culturist). Contrastingly, the sex ratio 1:12 yielded the highest clutch sizes and a high percentage female spawning return, and therefore represented the most effective utilization of broodstock (an important consideration for culturists inhibited by financial constraints or having an abundance of culture vessels). The reproductive behaviour of A. baenschi was described. Emphasis was given to aspects of reproduction of relevance to culture, for example; spawning times and seasons, clutch size and its relationship with female size, age and size of sexes at first spawning, embryo development rate and size of first swimming juveniles. The slow growth rate of juveniles, combined with a late attainment of marketable size (± seven months) was a major limitation affecting the cuIture potential of A. baenschi. Two factors favouring the cuIture of this species was the high survival rate recorded for both adults and juveniles, and the comparatively high prices fetched by fish on domestic wholesale markets (R4,00 per fish). It is recommended that A. baenschi should not be cultured exclusively for the relatively small South African ornamental fish market. A more profitable strategy for domestic culturists should involve a major production effort with A. baenschi and other desirable species of Aulonocara (e.g . A. ethelwynnae; A. hansbaenschi; A. stuartgranti & A. maylandi) for foreign markets (in particular, the U.S.A.; Western Europe & Japan). Not only are these markets massive, but prevailing exchange rates of the Rand with these currencies favour such a strategy.
- Full Text:
- Date Issued: 1988
- Authors: Impson, N D (Neville Dean)
- Date: 1988
- Subjects: Cichlids -- Nysas, Lake , Cichlids -- Nyasa, Lake -- Physiology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5208 , http://hdl.handle.net/10962/d1004596 , Cichlids -- Nysas, Lake , Cichlids -- Nyasa, Lake -- Physiology
- Description: The intensive tank culture of ornamental mouthbrooding cichlids poses several problems which limit their aquaculture potential. This project addressed some of these problems for Aulonocara baenschi. The production of juveniles in 2501 aquaria was accelerated when: a) aquaria were equipped with refuges, b) females of less than 70mm in standard length were used as broodstock, c) mouthbrooding females were replaced with gravid females at seven day intervals, and d) embryos were removed from the mouths of females at replacement times for artificial incubation. Two sex ratios also accelerated juvenile production. The sex ratio (male:females) 1:30 yielded the highest spawning returns per tank, and therefore represented the most effective utilization of aquarium space (a critical consideration for the small-scale culturist). Contrastingly, the sex ratio 1:12 yielded the highest clutch sizes and a high percentage female spawning return, and therefore represented the most effective utilization of broodstock (an important consideration for culturists inhibited by financial constraints or having an abundance of culture vessels). The reproductive behaviour of A. baenschi was described. Emphasis was given to aspects of reproduction of relevance to culture, for example; spawning times and seasons, clutch size and its relationship with female size, age and size of sexes at first spawning, embryo development rate and size of first swimming juveniles. The slow growth rate of juveniles, combined with a late attainment of marketable size (± seven months) was a major limitation affecting the cuIture potential of A. baenschi. Two factors favouring the cuIture of this species was the high survival rate recorded for both adults and juveniles, and the comparatively high prices fetched by fish on domestic wholesale markets (R4,00 per fish). It is recommended that A. baenschi should not be cultured exclusively for the relatively small South African ornamental fish market. A more profitable strategy for domestic culturists should involve a major production effort with A. baenschi and other desirable species of Aulonocara (e.g . A. ethelwynnae; A. hansbaenschi; A. stuartgranti & A. maylandi) for foreign markets (in particular, the U.S.A.; Western Europe & Japan). Not only are these markets massive, but prevailing exchange rates of the Rand with these currencies favour such a strategy.
- Full Text:
- Date Issued: 1988
Reaction of carbohydrates with the sulphuryl chloride-N, N-dimethyl formamide reagent
- Authors: Mabusela, Wilfred Thozamile
- Date: 1982
- Subjects: Chemical reactions Carbohydrates
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3731 , http://hdl.handle.net/10962/d1001470
- Description: An investigation of the reaction of the sulphuryl chloride-N, N-dimethyl formamide reagent with several carbohydrate compounds, containing free hydroxyl groups, was undertaken, mainly with the view of looking at substitution of the hydroxyl groups with chlorine atoms. The reaction was found to lead to substitution of both primary and secondary hydroxyl groups with chlorine, with inversion of configuration in the latter case. The reagent was further found to effect formylation and chlorosulphation of secondary hydroxyl groups, where nucleophilic substitution by a chlorine was not favourable. Studies involving the methyl pentopyranosides, showed that the reagent was particularly useful in the chlorosulphation and chlorination of sugars, compared with the hexopyranosides.
- Full Text:
- Date Issued: 1982
- Authors: Mabusela, Wilfred Thozamile
- Date: 1982
- Subjects: Chemical reactions Carbohydrates
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3731 , http://hdl.handle.net/10962/d1001470
- Description: An investigation of the reaction of the sulphuryl chloride-N, N-dimethyl formamide reagent with several carbohydrate compounds, containing free hydroxyl groups, was undertaken, mainly with the view of looking at substitution of the hydroxyl groups with chlorine atoms. The reaction was found to lead to substitution of both primary and secondary hydroxyl groups with chlorine, with inversion of configuration in the latter case. The reagent was further found to effect formylation and chlorosulphation of secondary hydroxyl groups, where nucleophilic substitution by a chlorine was not favourable. Studies involving the methyl pentopyranosides, showed that the reagent was particularly useful in the chlorosulphation and chlorination of sugars, compared with the hexopyranosides.
- Full Text:
- Date Issued: 1982
Die aktualiteit in die poësie van A Roland Holst
- Bezuidenhout, Gertruida Catharina
- Authors: Bezuidenhout, Gertruida Catharina
- Date: 1954
- Subjects: Roland Holst, Adrianus, 1888-1976 -- Criticism and interpretation , Dutch poetry -- 20th century -- History and criticism
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3639 , http://hdl.handle.net/10962/d1013499
- Description: From Verantwoording: By die ondersoek na die rol wat die aktualiteit in die poësie van A. Roland Holst speel, wou ons veral nagaan of die gedigte waarin elemente van die aktualiteit aanwesig is, in wese van sy orige werk verskil. Hoofstuk II, “Teen die Wereld” gaan veral sover dit die inhoud betref, op hierdie vraag in. In die derde en vierde hoofstukke is na aanleiding van ‘n aantal verteenwoordigende gedigte getrag om meer in besonderhede, en ook wat die vorm aangaan, die saak van nader te beskou, en die resultate van die ondersoek is in die Slotbeskouing saamgevat.
- Full Text:
- Date Issued: 1954
- Authors: Bezuidenhout, Gertruida Catharina
- Date: 1954
- Subjects: Roland Holst, Adrianus, 1888-1976 -- Criticism and interpretation , Dutch poetry -- 20th century -- History and criticism
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3639 , http://hdl.handle.net/10962/d1013499
- Description: From Verantwoording: By die ondersoek na die rol wat die aktualiteit in die poësie van A. Roland Holst speel, wou ons veral nagaan of die gedigte waarin elemente van die aktualiteit aanwesig is, in wese van sy orige werk verskil. Hoofstuk II, “Teen die Wereld” gaan veral sover dit die inhoud betref, op hierdie vraag in. In die derde en vierde hoofstukke is na aanleiding van ‘n aantal verteenwoordigende gedigte getrag om meer in besonderhede, en ook wat die vorm aangaan, die saak van nader te beskou, en die resultate van die ondersoek is in die Slotbeskouing saamgevat.
- Full Text:
- Date Issued: 1954