A model for privacy-aware presence management in mobile communications
- Authors: Ophoff, Jacobus Albertus
- Date: 2011
- Subjects: Mobile communications systems , Mobile communication systems -- Management
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9757 , http://hdl.handle.net/10948/1354 , Mobile communications systems , Mobile communication systems -- Management
- Description: As humans we find communicating natural and compelling. Over the centuries we have created many innovations which enable and improve communication between people; during the past decade mobile phone networks have brought about a technological revolution in this area. Never before have people been so connected to one another. Today we have the ability to communicate with almost anyone, anytime, anywhere. Our increased connectivity and reachability also leads to new issues and challenges that we need to deal with. When we phone someone we expect an instant connection, and when this does not occur it can be frustrating. On the other hand it is equally disruptive to receive a call when one is busy with an important task or in a situation where communication is inappropriate. Social protocol dictates that we try to minimize such situations for the benefit of others nearby and for ourselves. This management of communications is a constant and difficult task. Using presence – which signals a person’s availability and willingness to communicate – is a solution to this problem. Such information can benefit communication partners by increasing the likelihood of a successful connection and decreasing disruptions. This research addresses the problem of staying connected while keeping control over mobile communications. It adopts a design-science research paradigm, with the primary research artifact being a model for privacy-aware presence management in mobile communications. As part of the model development knowledge contributions are made in several ways. Existing knowledge about the problem area is extended through a quantitative analysis of mobile communications management. This analysis uses a novel survey, collecting useful empirical data for future research. This includes how people currently manage their communications and what features they expect from a potential “call management” system. The examination and use of presence standards, as a foundation for the model, provides a comparison of the main presence technologies available today. A focus on privacy features identifies several shortcomings in standards which, if addressed, can help to improve and make these standards more complete. The model stresses the privacy of potentially sensitive presence information. A unique perspective based on social relationship theories is adopted. The use of relationship groups not only makes logical sense but also assists in the management of presence information and extends existing standards. Finally, the evaluation of the model demonstrates the feasibility of a practical implementation as well the ability to extend the model in next generation mobile networks. Thus the model presents a solid foundation for the development of future services. In these ways the proposed model contributes positively towards balancing efficient mobile communications with the need for privacy-awareness.
- Full Text:
- Date Issued: 2011
- Authors: Ophoff, Jacobus Albertus
- Date: 2011
- Subjects: Mobile communications systems , Mobile communication systems -- Management
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9757 , http://hdl.handle.net/10948/1354 , Mobile communications systems , Mobile communication systems -- Management
- Description: As humans we find communicating natural and compelling. Over the centuries we have created many innovations which enable and improve communication between people; during the past decade mobile phone networks have brought about a technological revolution in this area. Never before have people been so connected to one another. Today we have the ability to communicate with almost anyone, anytime, anywhere. Our increased connectivity and reachability also leads to new issues and challenges that we need to deal with. When we phone someone we expect an instant connection, and when this does not occur it can be frustrating. On the other hand it is equally disruptive to receive a call when one is busy with an important task or in a situation where communication is inappropriate. Social protocol dictates that we try to minimize such situations for the benefit of others nearby and for ourselves. This management of communications is a constant and difficult task. Using presence – which signals a person’s availability and willingness to communicate – is a solution to this problem. Such information can benefit communication partners by increasing the likelihood of a successful connection and decreasing disruptions. This research addresses the problem of staying connected while keeping control over mobile communications. It adopts a design-science research paradigm, with the primary research artifact being a model for privacy-aware presence management in mobile communications. As part of the model development knowledge contributions are made in several ways. Existing knowledge about the problem area is extended through a quantitative analysis of mobile communications management. This analysis uses a novel survey, collecting useful empirical data for future research. This includes how people currently manage their communications and what features they expect from a potential “call management” system. The examination and use of presence standards, as a foundation for the model, provides a comparison of the main presence technologies available today. A focus on privacy features identifies several shortcomings in standards which, if addressed, can help to improve and make these standards more complete. The model stresses the privacy of potentially sensitive presence information. A unique perspective based on social relationship theories is adopted. The use of relationship groups not only makes logical sense but also assists in the management of presence information and extends existing standards. Finally, the evaluation of the model demonstrates the feasibility of a practical implementation as well the ability to extend the model in next generation mobile networks. Thus the model presents a solid foundation for the development of future services. In these ways the proposed model contributes positively towards balancing efficient mobile communications with the need for privacy-awareness.
- Full Text:
- Date Issued: 2011
A participatory communication approach of rural cattle project: a case study of Nguni cattle project in the Eastern Cape, South Africa
- Authors: Usadolo, Sam Erevbenagie
- Date: 2011
- Subjects: Communication in community development -- South Africa , Nguni cattle -- South Africa , Participatory rural appraisal
- Language: English
- Type: Thesis , Doctoral , PhD (Com)
- Identifier: vital:11370 , http://hdl.handle.net/10353/d1015407 , Communication in community development -- South Africa , Nguni cattle -- South Africa , Participatory rural appraisal
- Description: project. It did this by reviewing relevant literature in development communication. The review done showed that literature is replete with arguments critical of the dominant paradigm due to its top-down nature of communication. Scholars critical of dominant paradigm argue that participatory communication should be given a prominent role to ensure that stakeholders work in concert to realise the stated objectives of their development project. The study highlighted many contentious issues surrounding the nature and practices of participatory communication. It pointed out that the issues have played themselves out in literature in the form of different typologies of participatory practices, which were dealt with extensively in this study. The discussion of participatory communication in literature is also mindful of different models of communication and the space they occupy in participatory communication practices. In this study, there was a discussion of transactional communication models as depicted by Nair and White (1993:52) and Steinberg (1997:19). Both scholars emphasise that participatory communication will not achieve its stated purpose without mutual agreement of the parties in communication. They equally stress the recognition of the possible effects of some contextual factors which may have bearing on the prevailing nature of communication. A review of different communication tools used by participatory development communicator was given in the study. These different communication tools were discussed in view of how these tools can be used to advance participatory practice in a development project, especially with reference to the project examined in this study. Using qualitative research method, different and appropriate interview methods such as semi-structured, focus group and post-survey interviews were used to collect data from the respondents in this study. The analysis and discussion of the data revealed that different challenges on the ground could affect participatory communication practices in a development project. With regard to the project examined in this study, the analysis showed that there is a weak stakeholder relationship, especially stakeholders identified in this study as field officers. The study highlighted that stakeholders such as the agricultural extension officers and animal health technicians are not very active in the implementation process of the project. Some of the reasons pointed out is the fact that the secondary stakeholder such as the Provincial Department of Agricultural (PDoA) to which these field officers belong is not playing active role in ensuring that they complement the efforts of other field officers such as the IDC representatives. The second reason is the fact that the participatory focus of the project was not properly communicated to the beneficiaries. This also transpired in their inability to reflect participatory practice in their relationship with the beneficiaries and other stakeholders of the project. Other challenges, among others, as pointed out in the analysis showed that participatory communication practice requires expert personnel to be successful. In the case of the project examined, apart from the fact that there is shortage of manpower to handle the challenges mentioned in the study, there is no communication expert among the few active personnel in the field. The findings of this study showed that there was no clear role and identification of responsibilities let alone coordination of all actors involved in the project. Through the selected case study, this study has not only provided avenue to explore both theoretically and practically participatory communication, but has added to participatory communication discourse that there is no easy answer to challenges field officers encounter in practice. This is the reason the different participatory practices characterising nature of the project this study has investigated was given.
- Full Text:
- Date Issued: 2011
- Authors: Usadolo, Sam Erevbenagie
- Date: 2011
- Subjects: Communication in community development -- South Africa , Nguni cattle -- South Africa , Participatory rural appraisal
- Language: English
- Type: Thesis , Doctoral , PhD (Com)
- Identifier: vital:11370 , http://hdl.handle.net/10353/d1015407 , Communication in community development -- South Africa , Nguni cattle -- South Africa , Participatory rural appraisal
- Description: project. It did this by reviewing relevant literature in development communication. The review done showed that literature is replete with arguments critical of the dominant paradigm due to its top-down nature of communication. Scholars critical of dominant paradigm argue that participatory communication should be given a prominent role to ensure that stakeholders work in concert to realise the stated objectives of their development project. The study highlighted many contentious issues surrounding the nature and practices of participatory communication. It pointed out that the issues have played themselves out in literature in the form of different typologies of participatory practices, which were dealt with extensively in this study. The discussion of participatory communication in literature is also mindful of different models of communication and the space they occupy in participatory communication practices. In this study, there was a discussion of transactional communication models as depicted by Nair and White (1993:52) and Steinberg (1997:19). Both scholars emphasise that participatory communication will not achieve its stated purpose without mutual agreement of the parties in communication. They equally stress the recognition of the possible effects of some contextual factors which may have bearing on the prevailing nature of communication. A review of different communication tools used by participatory development communicator was given in the study. These different communication tools were discussed in view of how these tools can be used to advance participatory practice in a development project, especially with reference to the project examined in this study. Using qualitative research method, different and appropriate interview methods such as semi-structured, focus group and post-survey interviews were used to collect data from the respondents in this study. The analysis and discussion of the data revealed that different challenges on the ground could affect participatory communication practices in a development project. With regard to the project examined in this study, the analysis showed that there is a weak stakeholder relationship, especially stakeholders identified in this study as field officers. The study highlighted that stakeholders such as the agricultural extension officers and animal health technicians are not very active in the implementation process of the project. Some of the reasons pointed out is the fact that the secondary stakeholder such as the Provincial Department of Agricultural (PDoA) to which these field officers belong is not playing active role in ensuring that they complement the efforts of other field officers such as the IDC representatives. The second reason is the fact that the participatory focus of the project was not properly communicated to the beneficiaries. This also transpired in their inability to reflect participatory practice in their relationship with the beneficiaries and other stakeholders of the project. Other challenges, among others, as pointed out in the analysis showed that participatory communication practice requires expert personnel to be successful. In the case of the project examined, apart from the fact that there is shortage of manpower to handle the challenges mentioned in the study, there is no communication expert among the few active personnel in the field. The findings of this study showed that there was no clear role and identification of responsibilities let alone coordination of all actors involved in the project. Through the selected case study, this study has not only provided avenue to explore both theoretically and practically participatory communication, but has added to participatory communication discourse that there is no easy answer to challenges field officers encounter in practice. This is the reason the different participatory practices characterising nature of the project this study has investigated was given.
- Full Text:
- Date Issued: 2011
a pH-metric speciation and anti-diabetic study of oxovanadium (IV) amino acid derivatives
- Authors: Gundhla, Isaac Zvikomborero
- Date: 2011 , 2011-03-15
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4399 , http://hdl.handle.net/10962/d1006691
- Description: Novel oxovanadium(IV) complexes of glycine, ʟ-alanine, 1-methylimidazole-2-carboxylic acid, imidazole-2-caboxylic acid and imidazole-4-carboxylic acid were synthesized and isolated in the solid state. The ligands and complexes were characterized by elemental analysis, melting point, NMR, IR and UV-vis spectroscopy. The IR studies showed that glycine and ʟ-alanine coordinate monodentately through the amine nitrogen whilst the imidazole-carboxylic acid derivatives assume a bidentate chelation. The electronic spectroscopic studies indicate distorted octahedral geometry for the oxovanadium complexes of amino acids and a square pyramidal geometry for oxovanadium(IV) complexes of imidazole carboxylic acid derivatives. The reaction of vanadyl (VO2+) with glycine, ʟ-alanine, imidazole-2-cabrboxylic acid, imidazole-4-carboxylic acid and 1-methylimidazole-2-carboxylic acid was studied in aqueous solution by pH-potentiometry under oxygen and carbon dioxide-free conditions. The data obtained from these titrations were used to calculate the protonation and stability constants. The results showed that all ligands are suitable for bidentate coordination in the formation of monomeric species although the solid state studies of the oxovanadium(IV) complexes of amino acids showed a monodentate coordination. The overall stability constants for the (VIVO)-ʟ-alanine system (log β120 = 18.27(6)), (VIVO)-glycine system (β120 = 17.22(6)), (VIVO)-imidazole-4-carboxyic acid (β120 = 11.38(8)), (VIVO)-imidazole-2-carboxylic acid (β120 = 11.62(6)) and (VIVO)-1-methylimidazole-2-carboxylic acid (β120 = 15.49(9)) were obtained. The calculations for the species distribution in the experimental pH range showed that the neutral bis-coordinated complexes are dominant over the biological pH range. The glucose uptake effect of oxovanadium(IV) complex of ʟ-alanine, imidazole-4-carboxylic acid, imidazole-2-carboxylic acid and 1-methylimidazole-2-carboxylic acid was investigated using 3T3-L1 adipocytes, Chang liver and C2C12 muscle cells at various concentrations. The compounds had significant glucose uptake on Chang liver cells only at a concentration of 0.1-10 μM whilst in the C2C12 muscle and 3T3-L1 cells the compounds showed little to no activity probably due to the lower concentrations employed as a result of the cytotoxicity of these compounds on these two cell lines.
- Full Text:
- Date Issued: 2011
- Authors: Gundhla, Isaac Zvikomborero
- Date: 2011 , 2011-03-15
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4399 , http://hdl.handle.net/10962/d1006691
- Description: Novel oxovanadium(IV) complexes of glycine, ʟ-alanine, 1-methylimidazole-2-carboxylic acid, imidazole-2-caboxylic acid and imidazole-4-carboxylic acid were synthesized and isolated in the solid state. The ligands and complexes were characterized by elemental analysis, melting point, NMR, IR and UV-vis spectroscopy. The IR studies showed that glycine and ʟ-alanine coordinate monodentately through the amine nitrogen whilst the imidazole-carboxylic acid derivatives assume a bidentate chelation. The electronic spectroscopic studies indicate distorted octahedral geometry for the oxovanadium complexes of amino acids and a square pyramidal geometry for oxovanadium(IV) complexes of imidazole carboxylic acid derivatives. The reaction of vanadyl (VO2+) with glycine, ʟ-alanine, imidazole-2-cabrboxylic acid, imidazole-4-carboxylic acid and 1-methylimidazole-2-carboxylic acid was studied in aqueous solution by pH-potentiometry under oxygen and carbon dioxide-free conditions. The data obtained from these titrations were used to calculate the protonation and stability constants. The results showed that all ligands are suitable for bidentate coordination in the formation of monomeric species although the solid state studies of the oxovanadium(IV) complexes of amino acids showed a monodentate coordination. The overall stability constants for the (VIVO)-ʟ-alanine system (log β120 = 18.27(6)), (VIVO)-glycine system (β120 = 17.22(6)), (VIVO)-imidazole-4-carboxyic acid (β120 = 11.38(8)), (VIVO)-imidazole-2-carboxylic acid (β120 = 11.62(6)) and (VIVO)-1-methylimidazole-2-carboxylic acid (β120 = 15.49(9)) were obtained. The calculations for the species distribution in the experimental pH range showed that the neutral bis-coordinated complexes are dominant over the biological pH range. The glucose uptake effect of oxovanadium(IV) complex of ʟ-alanine, imidazole-4-carboxylic acid, imidazole-2-carboxylic acid and 1-methylimidazole-2-carboxylic acid was investigated using 3T3-L1 adipocytes, Chang liver and C2C12 muscle cells at various concentrations. The compounds had significant glucose uptake on Chang liver cells only at a concentration of 0.1-10 μM whilst in the C2C12 muscle and 3T3-L1 cells the compounds showed little to no activity probably due to the lower concentrations employed as a result of the cytotoxicity of these compounds on these two cell lines.
- Full Text:
- Date Issued: 2011
A platform for computer-assisted multilingual literacy development
- Authors: Mudimba, Bwini Chizabubi
- Date: 2011
- Subjects: FundaWethu , Language acquisition -- Computer-assisted instruction , Language arts (Elementary) -- Computer-assisted instruction , Language and education , Education, Bilingual , Computer-assisted instruction , Educational technology , Computers and literacy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4600 , http://hdl.handle.net/10962/d1004850 , FundaWethu , Language acquisition -- Computer-assisted instruction , Language arts (Elementary) -- Computer-assisted instruction , Language and education , Education, Bilingual , Computer-assisted instruction , Educational technology , Computers and literacy
- Description: FundaWethu is reading software that is designed to deliver reading lessons to Grade R-3 (foundation phase) children who are learning to read in a multilingual context. Starting from a premise that the system should be both educative and entertaining, the system allows literacy researchers or teachers to construct rich multimedia reading lessons, with text, pictures (possibly animated), and audio files. Using the design-based research methodology which is problem driven and iterative, we followed a user-centred design process in creating FundaWethu. To promote sustainability of the software, we chose to bring teachers on board as “co-designers” using the lesson authoring tool. We made the authoring tool simple enough for use by non computer specialists, but expressive enough to enable a wide range of beginners reading exercises to be constructed in a number of different languages (indigenous South African languages in particular). This project therefore centred on the use of designbased research to build FundaWethu, the design and construction of FundaWethu and the usability study carried out to determine the adequacy of FundaWethu.
- Full Text:
- Date Issued: 2011
- Authors: Mudimba, Bwini Chizabubi
- Date: 2011
- Subjects: FundaWethu , Language acquisition -- Computer-assisted instruction , Language arts (Elementary) -- Computer-assisted instruction , Language and education , Education, Bilingual , Computer-assisted instruction , Educational technology , Computers and literacy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4600 , http://hdl.handle.net/10962/d1004850 , FundaWethu , Language acquisition -- Computer-assisted instruction , Language arts (Elementary) -- Computer-assisted instruction , Language and education , Education, Bilingual , Computer-assisted instruction , Educational technology , Computers and literacy
- Description: FundaWethu is reading software that is designed to deliver reading lessons to Grade R-3 (foundation phase) children who are learning to read in a multilingual context. Starting from a premise that the system should be both educative and entertaining, the system allows literacy researchers or teachers to construct rich multimedia reading lessons, with text, pictures (possibly animated), and audio files. Using the design-based research methodology which is problem driven and iterative, we followed a user-centred design process in creating FundaWethu. To promote sustainability of the software, we chose to bring teachers on board as “co-designers” using the lesson authoring tool. We made the authoring tool simple enough for use by non computer specialists, but expressive enough to enable a wide range of beginners reading exercises to be constructed in a number of different languages (indigenous South African languages in particular). This project therefore centred on the use of designbased research to build FundaWethu, the design and construction of FundaWethu and the usability study carried out to determine the adequacy of FundaWethu.
- Full Text:
- Date Issued: 2011
A psychobiography of Archbishop Emeritus Desmond Mpilo Tutu
- Authors: Eliastam, Liesl Marijke
- Date: 2011
- Subjects: Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Language: English
- Type: Thesis , Masters , M Soc Sc (C Psy)
- Identifier: vital:11856 , http://hdl.handle.net/10353/537 , Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Description: Psychobiographies offer the illuminating experience of uncovering the story of an individual’s life through the lens of a psychological theory. Psychobiographies offer the chance to gain a deeper understanding of what makes that individual unique. This study aimed to explore and describe the emotional intelligence of Archbishop Emeritus Desmond Tutu according to Goleman’s (1998) theory of Emotional Intelligence. Tutu was chosen as a subject for this study because of his extraordinary life and accomplishments, and because he is regarded as a prominent figure of moral leadership in South Africa. A qualitative psychobiographical research method was utilised. Data was collected from both primary and secondary sources to enhance internal validity, and was then analysed according to Miles and Huberman’s (1994) approach. The findings suggest that Tutu applied all of the twenty five emotional intelligence capacities during his life, and that at times, some were used more extensively than others. This study is groundbreaking in that it is the first psychobiography on Desmond Tutu, and it is the first psychobiography undertaken at the University of Fort Hare. Psychobiographies offer an opportunity to evaluate the psychological theory which is applied. It was found that Goleman’s (1998) theory of Emotional Intelligence is supported by this study.
- Full Text:
- Date Issued: 2011
- Authors: Eliastam, Liesl Marijke
- Date: 2011
- Subjects: Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Language: English
- Type: Thesis , Masters , M Soc Sc (C Psy)
- Identifier: vital:11856 , http://hdl.handle.net/10353/537 , Developmental psychology , Life cycle, Human -- Psychological aspects , Psychology -- Biographical methods , Personality -- Research -- Methodology , Emotional intelligence
- Description: Psychobiographies offer the illuminating experience of uncovering the story of an individual’s life through the lens of a psychological theory. Psychobiographies offer the chance to gain a deeper understanding of what makes that individual unique. This study aimed to explore and describe the emotional intelligence of Archbishop Emeritus Desmond Tutu according to Goleman’s (1998) theory of Emotional Intelligence. Tutu was chosen as a subject for this study because of his extraordinary life and accomplishments, and because he is regarded as a prominent figure of moral leadership in South Africa. A qualitative psychobiographical research method was utilised. Data was collected from both primary and secondary sources to enhance internal validity, and was then analysed according to Miles and Huberman’s (1994) approach. The findings suggest that Tutu applied all of the twenty five emotional intelligence capacities during his life, and that at times, some were used more extensively than others. This study is groundbreaking in that it is the first psychobiography on Desmond Tutu, and it is the first psychobiography undertaken at the University of Fort Hare. Psychobiographies offer an opportunity to evaluate the psychological theory which is applied. It was found that Goleman’s (1998) theory of Emotional Intelligence is supported by this study.
- Full Text:
- Date Issued: 2011
A regulationist approach to South Africa and a critique of inflation targeting
- Authors: Bax, Ryan Michael Jonathan
- Date: 2011
- Subjects: Inflation (Finance) -- South Africa International finance Economic development -- South Africa Sustainable development -- South Africa Inflation targeting -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1036 , http://hdl.handle.net/10962/d1004533
- Description: Since the 1970s, the international economic system has become prone to the volatility and undue effects associated with booms and busts. This forty year period spanning the present has exhibited restrained growth and repressive economic development. Critical changes to the system are presented by the transition from "Fordism" to the post 1970s neoliberal regime and the globalization of world markets. Underpinning this transformation is an ideological shift towards free market capitalism and the adoption of "reduced form" market models. These "reduced form" models appear to hinder economic sustainability as their grounding in economics fails to account for real economic activity. This thesis aims to provide a more holistic perception of sustainability, one that provides a sound basis on which to develop sustainable economic policy. The Regulationist Approach presents the requisite understanding of economic sustainability required within this research. The inclusion of economic, historical and socio-political fields of research proposes a wider understanding of the political economy and sustainability. The application of the Regulation Approach to the South African economy illustrates many problem areas that require attention. The examination found that firstly, aggregate demand in the South African economy was unsustainable due to the debt driven nature of demand under the asset price bubble of the mid to late 2000s. Secondly, aggregate supply also proved unsustainable as government is failing to provide any substantive growth within important sectors of the economy such as education and the provision of general services. Furthermore, the adoption of inflation targeting in South Africa poses a barrier to sustained economic growth as it focuses singularly on price inflation. The "reduced form" model of inflation targeting fails to account for market failures and a number of vital indicators of sustainability most notably, debt levels and asset prices. The inclusion of these indicators, and financial stability more generally, are found to provide a more holistic and sustainable approach to macroeconomic policymaking.
- Full Text:
- Date Issued: 2011
- Authors: Bax, Ryan Michael Jonathan
- Date: 2011
- Subjects: Inflation (Finance) -- South Africa International finance Economic development -- South Africa Sustainable development -- South Africa Inflation targeting -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1036 , http://hdl.handle.net/10962/d1004533
- Description: Since the 1970s, the international economic system has become prone to the volatility and undue effects associated with booms and busts. This forty year period spanning the present has exhibited restrained growth and repressive economic development. Critical changes to the system are presented by the transition from "Fordism" to the post 1970s neoliberal regime and the globalization of world markets. Underpinning this transformation is an ideological shift towards free market capitalism and the adoption of "reduced form" market models. These "reduced form" models appear to hinder economic sustainability as their grounding in economics fails to account for real economic activity. This thesis aims to provide a more holistic perception of sustainability, one that provides a sound basis on which to develop sustainable economic policy. The Regulationist Approach presents the requisite understanding of economic sustainability required within this research. The inclusion of economic, historical and socio-political fields of research proposes a wider understanding of the political economy and sustainability. The application of the Regulation Approach to the South African economy illustrates many problem areas that require attention. The examination found that firstly, aggregate demand in the South African economy was unsustainable due to the debt driven nature of demand under the asset price bubble of the mid to late 2000s. Secondly, aggregate supply also proved unsustainable as government is failing to provide any substantive growth within important sectors of the economy such as education and the provision of general services. Furthermore, the adoption of inflation targeting in South Africa poses a barrier to sustained economic growth as it focuses singularly on price inflation. The "reduced form" model of inflation targeting fails to account for market failures and a number of vital indicators of sustainability most notably, debt levels and asset prices. The inclusion of these indicators, and financial stability more generally, are found to provide a more holistic and sustainable approach to macroeconomic policymaking.
- Full Text:
- Date Issued: 2011
A research tool for analysing and monitoring the Extent to which Environmental issues are integrated into teachers’ lessons
- Authors: Nsubuga, Yvonne
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386447 , vital:68142 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122246"
- Description: South Africa enjoys strong policy support for the integration of environmental issues into school curricula. However, much doubt exists over the extent to which this has been converted into appropriate classroom practice at the majority of under-resourced rural schools in the country. This article reports on a study which piloted a research tool which can be used to analyse teachers’ lessons, with the aim of gaining insight into the extent to which they integrate natural resource management issues. The research tool was based on Bernstein’s concept of classification and consisted of five indicators of natural resource management integration into Life Sciences lessons. The study contributes to the design of research tools that can be used to analyse and monitor the integration of environmental issues into teachers’ lessons. It also provides some insight into the environmental content of a sample of Grade 10 Life Sciences lessons at four rural underresourced schools in the Eastern Cape.
- Full Text:
- Date Issued: 2011
- Authors: Nsubuga, Yvonne
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386447 , vital:68142 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122246"
- Description: South Africa enjoys strong policy support for the integration of environmental issues into school curricula. However, much doubt exists over the extent to which this has been converted into appropriate classroom practice at the majority of under-resourced rural schools in the country. This article reports on a study which piloted a research tool which can be used to analyse teachers’ lessons, with the aim of gaining insight into the extent to which they integrate natural resource management issues. The research tool was based on Bernstein’s concept of classification and consisted of five indicators of natural resource management integration into Life Sciences lessons. The study contributes to the design of research tools that can be used to analyse and monitor the integration of environmental issues into teachers’ lessons. It also provides some insight into the environmental content of a sample of Grade 10 Life Sciences lessons at four rural underresourced schools in the Eastern Cape.
- Full Text:
- Date Issued: 2011
A review of marine phylogeography in southern Africa
- Teske, Peter R, Von der Heyden, Sophie, McQuaid, Christopher D, Barker, Nigel P
- Authors: Teske, Peter R , Von der Heyden, Sophie , McQuaid, Christopher D , Barker, Nigel P
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445392 , vital:74382 , https://hdl.handle.net/10520/EJC97146
- Description: The southern African marine realm is located at the transition zone between the Atlantic and Indo-Pacific biomes. Its biodiversity is particularly rich and comprises faunal and floral elements from the two major oceanic regions, as well as a large number of endemics. Within this realm, strikingly different biota occur in close geographic proximity to each other, and many of the species with distributions spanning two or more of the region's marine biogeographic provinces are divided into evolutionary units that can often only be distinguished on the basis of genetic data. In this review, we describe the state of marine phylogeography in southern Africa, that is, the study of evolutionary relationships at the species level, or amongst closely related species, in relation to the region's marine environment. We focus particularly on coastal phylogeography, where much progress has recently been made in identifying phylogeographic breaks and explaining how they originated and are maintained. We also highlight numerous shortcomings that should be addressed in the near future. These include: the limited data available for commercially important organisms, particularly offshore species; the paucity of oceanographic data for nearshore areas; a dearth of studies based on multilocus data; and the fact that studying the role of diversifying selection in speciation has been limited to physiological approaches to the exclusion of genetics. It is becoming apparent that the southern African marine realm is one of the world's most interesting environments in which to study the evolutionary processes that shape not only regional, but also global patterns of marine biodiversity.
- Full Text:
- Date Issued: 2011
- Authors: Teske, Peter R , Von der Heyden, Sophie , McQuaid, Christopher D , Barker, Nigel P
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445392 , vital:74382 , https://hdl.handle.net/10520/EJC97146
- Description: The southern African marine realm is located at the transition zone between the Atlantic and Indo-Pacific biomes. Its biodiversity is particularly rich and comprises faunal and floral elements from the two major oceanic regions, as well as a large number of endemics. Within this realm, strikingly different biota occur in close geographic proximity to each other, and many of the species with distributions spanning two or more of the region's marine biogeographic provinces are divided into evolutionary units that can often only be distinguished on the basis of genetic data. In this review, we describe the state of marine phylogeography in southern Africa, that is, the study of evolutionary relationships at the species level, or amongst closely related species, in relation to the region's marine environment. We focus particularly on coastal phylogeography, where much progress has recently been made in identifying phylogeographic breaks and explaining how they originated and are maintained. We also highlight numerous shortcomings that should be addressed in the near future. These include: the limited data available for commercially important organisms, particularly offshore species; the paucity of oceanographic data for nearshore areas; a dearth of studies based on multilocus data; and the fact that studying the role of diversifying selection in speciation has been limited to physiological approaches to the exclusion of genetics. It is becoming apparent that the southern African marine realm is one of the world's most interesting environments in which to study the evolutionary processes that shape not only regional, but also global patterns of marine biodiversity.
- Full Text:
- Date Issued: 2011
A review of the performance of Botswana citizen building contractors
- Authors: Muche, Freeman Hansungule
- Date: 2011
- Subjects: Contractors , Building -- Botswana , Construction industry -- Botswana
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9685 , http://hdl.handle.net/10948/1336 , Contractors , Building -- Botswana , Construction industry -- Botswana
- Description: Botswana was left underdeveloped in 1966 when it gained its independence from Great Britain. However, with the discovery of diamonds in the late 1970s, the economy of the country changed and two decades later the construction industry had experienced phenomenal growth. A growth propelled by the dominance of foreign contractors and the few citizen contractors available at the time resulted in a competitive environment in the industry. However, citizen contractors were unable to compete on the same level with their foreign counterparts, which was attributable to various factors such as a lack of resources and of business and technical experience. Being a major player in the construction industry, and realising the need to equip and encourage its own base of citizen contractors to actively participate in construction activities, the government of Botswana adopted new measures and policies that were meant to address the imbalances in the construction industry much to the advantage of citizen contractors. The rationale behind this study is to investigate the performance of citizen building contractors following the introduction of preferential procurement policies by the government of Botswana. This research study adopted the descriptive and analytical survey method which entailed the use of questionnaires and a review of the related literature for gathering relevant data. The sample strata included building contractors, consultants, and clients in the Botswana construction industry in Gaborone, Francistown, Selebi-phikwe, Maun, Serowe, and Lobatse. The empirical findings revealed that there is indeed a need to review some of the government assistance programs for citizen contractors in order to avoid the abuse of government resources and to further increase the citizen contractor’s knowledge base, skills, resources and capacity through mentorship and workshops. vi It is therefore incumbent upon government to protect those beneficiaries who genuinely require such assistance by critical assessment of the ineffective policies for the benefit of the whole industry
- Full Text:
- Date Issued: 2011
- Authors: Muche, Freeman Hansungule
- Date: 2011
- Subjects: Contractors , Building -- Botswana , Construction industry -- Botswana
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9685 , http://hdl.handle.net/10948/1336 , Contractors , Building -- Botswana , Construction industry -- Botswana
- Description: Botswana was left underdeveloped in 1966 when it gained its independence from Great Britain. However, with the discovery of diamonds in the late 1970s, the economy of the country changed and two decades later the construction industry had experienced phenomenal growth. A growth propelled by the dominance of foreign contractors and the few citizen contractors available at the time resulted in a competitive environment in the industry. However, citizen contractors were unable to compete on the same level with their foreign counterparts, which was attributable to various factors such as a lack of resources and of business and technical experience. Being a major player in the construction industry, and realising the need to equip and encourage its own base of citizen contractors to actively participate in construction activities, the government of Botswana adopted new measures and policies that were meant to address the imbalances in the construction industry much to the advantage of citizen contractors. The rationale behind this study is to investigate the performance of citizen building contractors following the introduction of preferential procurement policies by the government of Botswana. This research study adopted the descriptive and analytical survey method which entailed the use of questionnaires and a review of the related literature for gathering relevant data. The sample strata included building contractors, consultants, and clients in the Botswana construction industry in Gaborone, Francistown, Selebi-phikwe, Maun, Serowe, and Lobatse. The empirical findings revealed that there is indeed a need to review some of the government assistance programs for citizen contractors in order to avoid the abuse of government resources and to further increase the citizen contractor’s knowledge base, skills, resources and capacity through mentorship and workshops. vi It is therefore incumbent upon government to protect those beneficiaries who genuinely require such assistance by critical assessment of the ineffective policies for the benefit of the whole industry
- Full Text:
- Date Issued: 2011
A revision of the Pyura stolonifera species complex (Tunicata, Ascidiacea), with a description of a new species from Australia
- Authors: Teske, Peter R , Ruis, Marc
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445654 , vital:74411 , https://www.biotaxa.org/Zootaxa/article/view/zootaxa.2754.1.2
- Description: Pyura stolonifera is a large solitary ascidian found in Africa, Australasia and South America. The taxonomic status of different populations of this species is disputed, especially since there is evidence for several distinct morphological and genetic units that point towards the existence of multiple cryptic species. While some researchers still recognize P. stolonifera as a single species, others treat the different populations as distinct species. Here, we present a revision of the P. stolonifera species complex based on the examination of samples from all regions where there are reliable reports of this taxon. We recognize four species that are both morphologically and genetically distinct, one of which is new to science and is formally described here. This species is morphologically distinct from the other three members of the species complex in terms of the colour and texture of the tunic, the arrangement of the gonads within the gut and the shape of the dorsal tubercle, among other characters. We name the new species Pyura dalbyi after Dr. J.E. Dalby Jr., whose research on its ecology and distribution provided the incentive for examining this species more closely.
- Full Text:
- Date Issued: 2011
- Authors: Teske, Peter R , Ruis, Marc
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445654 , vital:74411 , https://www.biotaxa.org/Zootaxa/article/view/zootaxa.2754.1.2
- Description: Pyura stolonifera is a large solitary ascidian found in Africa, Australasia and South America. The taxonomic status of different populations of this species is disputed, especially since there is evidence for several distinct morphological and genetic units that point towards the existence of multiple cryptic species. While some researchers still recognize P. stolonifera as a single species, others treat the different populations as distinct species. Here, we present a revision of the P. stolonifera species complex based on the examination of samples from all regions where there are reliable reports of this taxon. We recognize four species that are both morphologically and genetically distinct, one of which is new to science and is formally described here. This species is morphologically distinct from the other three members of the species complex in terms of the colour and texture of the tunic, the arrangement of the gonads within the gut and the shape of the dorsal tubercle, among other characters. We name the new species Pyura dalbyi after Dr. J.E. Dalby Jr., whose research on its ecology and distribution provided the incentive for examining this species more closely.
- Full Text:
- Date Issued: 2011
A Search for Conjunctions at a Time of Direction-setting Review and Synthesis
- Authors: O'Donoghue, Rob B
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/387134 , vital:68209 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122240"
- Description: This journal reflects a diversity of environment and sustainability education research and viewpoints alongside two synthesis papers. Read as a whole and within a widely held ideal that diversity reflects resilience, the environment and education for sustainable development landscape in Africa might be said to be healthy and proliferating. But read against the pressure to produce tangible evidence of change on an African landscape of persistent climate variation and poverty, along with a widening gap between rich and poor, the picture remains challenging. These contrasting readings are notable at a time when we are looking towards the Association for the Development of Education in Africa (ADEA) Triennial in February, 2012, the Rio+20 Earth Summit in June 2012 and our own EEASA +30 conference in September 2012. The UN Decade of Education for Sustainable Development is characterised by a proliferation of education imperatives. These emerged as modern education in response to the issues of the day and now a modernity in deepening crisis.
- Full Text:
- Date Issued: 2011
- Authors: O'Donoghue, Rob B
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/387134 , vital:68209 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122240"
- Description: This journal reflects a diversity of environment and sustainability education research and viewpoints alongside two synthesis papers. Read as a whole and within a widely held ideal that diversity reflects resilience, the environment and education for sustainable development landscape in Africa might be said to be healthy and proliferating. But read against the pressure to produce tangible evidence of change on an African landscape of persistent climate variation and poverty, along with a widening gap between rich and poor, the picture remains challenging. These contrasting readings are notable at a time when we are looking towards the Association for the Development of Education in Africa (ADEA) Triennial in February, 2012, the Rio+20 Earth Summit in June 2012 and our own EEASA +30 conference in September 2012. The UN Decade of Education for Sustainable Development is characterised by a proliferation of education imperatives. These emerged as modern education in response to the issues of the day and now a modernity in deepening crisis.
- Full Text:
- Date Issued: 2011
A self-reflection of my interactions, communication and relationship structures in the classroom
- Authors: Rensburg, Cheryl Dawn
- Date: 2011
- Subjects: Interaction analysis in education , Teacher-student relationships , Classroom environment
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9560 , http://hdl.handle.net/10948/d1012587 , Interaction analysis in education , Teacher-student relationships , Classroom environment
- Description: Good communication and maintaining effective relationships within a school community are essential for achieving high academic standards. The aim of effective communication between teachers and learners is to elicit and ensure behaviour that will enhance the learning process. It is therefore important that teachers relate to learners in a sensitive manner when they communicate their knowledge (Bingham and Sidorkin 2004, 5). Sotto (2007, 96) further contends that teachers‟ communication styles reveal their core attitude towards learning and that the success of their teaching will be partially determined by how effectively they communicate. Many schools are experiencing disciplinary problems, low teacher and learner expectations, a breakdown of the social order, and a high incidence of academic failure. Bingham and Sidorkin (2004, 5) explain the above-mentioned problems as symptoms of a breakdown in communication between educators and learners. Once relationships in a school have been jeopardised, it becomes increasingly difficult to achieve high academic standards. It is therefore essential that educators create meaningful interactions in an environment in which all individuals can develop to their full potential. The National Education Policy Act No. 27 of 1996 (Education Labour Relations Council 2003, A- 4) advocates the enhancement of quality education and innovation through systematic research and development. The principles contained therein are directed towards enabling the education system to contribute to the full development of each learner, respecting each learner‟s right to freedom of thought, opinion and expression within a culture of respect for teaching and learning. The establishment and strengthening of relationships in a school will contribute to improved academic achievement.
- Full Text:
- Date Issued: 2011
- Authors: Rensburg, Cheryl Dawn
- Date: 2011
- Subjects: Interaction analysis in education , Teacher-student relationships , Classroom environment
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9560 , http://hdl.handle.net/10948/d1012587 , Interaction analysis in education , Teacher-student relationships , Classroom environment
- Description: Good communication and maintaining effective relationships within a school community are essential for achieving high academic standards. The aim of effective communication between teachers and learners is to elicit and ensure behaviour that will enhance the learning process. It is therefore important that teachers relate to learners in a sensitive manner when they communicate their knowledge (Bingham and Sidorkin 2004, 5). Sotto (2007, 96) further contends that teachers‟ communication styles reveal their core attitude towards learning and that the success of their teaching will be partially determined by how effectively they communicate. Many schools are experiencing disciplinary problems, low teacher and learner expectations, a breakdown of the social order, and a high incidence of academic failure. Bingham and Sidorkin (2004, 5) explain the above-mentioned problems as symptoms of a breakdown in communication between educators and learners. Once relationships in a school have been jeopardised, it becomes increasingly difficult to achieve high academic standards. It is therefore essential that educators create meaningful interactions in an environment in which all individuals can develop to their full potential. The National Education Policy Act No. 27 of 1996 (Education Labour Relations Council 2003, A- 4) advocates the enhancement of quality education and innovation through systematic research and development. The principles contained therein are directed towards enabling the education system to contribute to the full development of each learner, respecting each learner‟s right to freedom of thought, opinion and expression within a culture of respect for teaching and learning. The establishment and strengthening of relationships in a school will contribute to improved academic achievement.
- Full Text:
- Date Issued: 2011
A series of systematic case studies on the treatment of rape-related PTSD in the South African context implications for practice and policy
- Authors: Padmanabhanunni, Anita
- Date: 2011
- Subjects: Post-traumatic stress disorder -- South Africa -- Treatment Post-traumatic stress disorder -- Patients Case studies Rape victims -- Counseling of -- South Africa Psychic trauma -- Treatment Rape victims -- Counseling of Case studies Cognitive therapy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3035 , http://hdl.handle.net/10962/d1002544
- Description: In 2009, South African police statistics revealed that more than 68 332 women were raped in the country. The evidence from independent researchers has shown that SAPS statistics are highly susceptible to under-reporting and the actual figure is more than double this amount. One pervasive feature of the phenomenology of rape is post-traumatic stress disorder (PTSD). PTSD is a highly debilitating condition with severe individual and societal costs. The condition takes a critical toll on occupational functioning, schooling and personal relationships and is associated with depression, suicide risk, self-harming behaviours and alcohol-abuse problems. The Ehlers and Clark (2000) cognitive model represents the most efficacious treatment for PTSD but the approach is severely under-utilised by South African practitioners working with sexual trauma. The reasons for such under-utilisation relate to a lack of exposure and training surrounding the model and concerns about the transportability of the treatment to a multi-cultural context. One method of addressing these barriers to treatment delivery is through systematic case-based research. Systematic case-based research offers a complementary means of refining theory and developing evidence-based practice in the context of a developing country. The method offers an intensive analysis and description of the particular phenomena under study within its real-life context. It allows the researcher to intensively examine and identify the specific aspects of the therapist’s responses and client’s reactions that contributed to significant change. Unlike efficacy studies, generalisability in case-study research is based on replication on a case-by-case basis and the creation of case law. This research study uses a systematic-case study approach to investigate the applicability of the Ehlers and Clark (2000) model in the treatment of rape-related PTSD in South Africa. The study aims to demonstrate the transportability of the model and develop a needed evidence base for service providers in the country. Seven women participated in the project and lent their treatment process to the research. The participants varied in terms of age, race, culture, socio-economic status and the nature of their sexual trauma. Through synoptic thematic analysis of their therapy process specific client-related personal aspects, client-related contextual factors and state-level factors were found to impede treatment delivery and implementation. The implications of these aspects for clinical practice and social policy are comprehensively discussed.
- Full Text:
- Date Issued: 2011
- Authors: Padmanabhanunni, Anita
- Date: 2011
- Subjects: Post-traumatic stress disorder -- South Africa -- Treatment Post-traumatic stress disorder -- Patients Case studies Rape victims -- Counseling of -- South Africa Psychic trauma -- Treatment Rape victims -- Counseling of Case studies Cognitive therapy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3035 , http://hdl.handle.net/10962/d1002544
- Description: In 2009, South African police statistics revealed that more than 68 332 women were raped in the country. The evidence from independent researchers has shown that SAPS statistics are highly susceptible to under-reporting and the actual figure is more than double this amount. One pervasive feature of the phenomenology of rape is post-traumatic stress disorder (PTSD). PTSD is a highly debilitating condition with severe individual and societal costs. The condition takes a critical toll on occupational functioning, schooling and personal relationships and is associated with depression, suicide risk, self-harming behaviours and alcohol-abuse problems. The Ehlers and Clark (2000) cognitive model represents the most efficacious treatment for PTSD but the approach is severely under-utilised by South African practitioners working with sexual trauma. The reasons for such under-utilisation relate to a lack of exposure and training surrounding the model and concerns about the transportability of the treatment to a multi-cultural context. One method of addressing these barriers to treatment delivery is through systematic case-based research. Systematic case-based research offers a complementary means of refining theory and developing evidence-based practice in the context of a developing country. The method offers an intensive analysis and description of the particular phenomena under study within its real-life context. It allows the researcher to intensively examine and identify the specific aspects of the therapist’s responses and client’s reactions that contributed to significant change. Unlike efficacy studies, generalisability in case-study research is based on replication on a case-by-case basis and the creation of case law. This research study uses a systematic-case study approach to investigate the applicability of the Ehlers and Clark (2000) model in the treatment of rape-related PTSD in South Africa. The study aims to demonstrate the transportability of the model and develop a needed evidence base for service providers in the country. Seven women participated in the project and lent their treatment process to the research. The participants varied in terms of age, race, culture, socio-economic status and the nature of their sexual trauma. Through synoptic thematic analysis of their therapy process specific client-related personal aspects, client-related contextual factors and state-level factors were found to impede treatment delivery and implementation. The implications of these aspects for clinical practice and social policy are comprehensively discussed.
- Full Text:
- Date Issued: 2011
A short composition portfolio
- Buitendag, Kingsley Alexander
- Authors: Buitendag, Kingsley Alexander
- Date: 2011
- Subjects: Music -- South Africa Composition (Music)
- Language: English
- Type: text , Thesis , Masters , MMus
- Identifier: vital:2632 , http://hdl.handle.net/10962/d1002297
- Full Text:
- Date Issued: 2011
- Authors: Buitendag, Kingsley Alexander
- Date: 2011
- Subjects: Music -- South Africa Composition (Music)
- Language: English
- Type: text , Thesis , Masters , MMus
- Identifier: vital:2632 , http://hdl.handle.net/10962/d1002297
- Full Text:
- Date Issued: 2011
A South African response to ethics in legal education
- Authors: Kruuse, Helen
- Date: 2011
- Language: English
- Type: Article , text
- Identifier: http://hdl.handle.net/10962/54174 , vital:26399 , https://www.routledge.com/The-Ethics-Project-in-Legal-Education/Robertson-Corbin-Tranter-Bartlett/p/book/9780415546515
- Description: The contributions in this volume suggest that "the ethics project in legal education" is increasingly an international one. Even though the strength of commitment by both the profession and the legal academy to "ethics learning" within law schools varies, two fundamental questions confront all who work in this area. First, what is it that we want our students to learn (or, perhaps, in what manner do we want our students to develop) from the teaching of "legal ethics"? Second, how can we create a learning environment that will encourage the nature and quality of learning we think is important?.
- Full Text: false
- Date Issued: 2011
- Authors: Kruuse, Helen
- Date: 2011
- Language: English
- Type: Article , text
- Identifier: http://hdl.handle.net/10962/54174 , vital:26399 , https://www.routledge.com/The-Ethics-Project-in-Legal-Education/Robertson-Corbin-Tranter-Bartlett/p/book/9780415546515
- Description: The contributions in this volume suggest that "the ethics project in legal education" is increasingly an international one. Even though the strength of commitment by both the profession and the legal academy to "ethics learning" within law schools varies, two fundamental questions confront all who work in this area. First, what is it that we want our students to learn (or, perhaps, in what manner do we want our students to develop) from the teaching of "legal ethics"? Second, how can we create a learning environment that will encourage the nature and quality of learning we think is important?.
- Full Text: false
- Date Issued: 2011
A stable isotope approach for the early detection and identification of N loading in aquatic ecosystems
- Hill, Jaclyn M, Kaehler, Sven, Hill, Martin P, Coetzee, Julie A
- Authors: Hill, Jaclyn M , Kaehler, Sven , Hill, Martin P , Coetzee, Julie A
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444491 , vital:74245 , https://www.wrc.org.za/wp-content/uploads/mdocs/KV 280.pdf
- Description: Global increases in urbanization and anthropogenic activity within wa-tersheds and catchment areas have resulted in excessive nitrogen loads in aquatic ecosystems. South Africa is deeply dependent on nat-ural resources for its economic health and as a consequence is particu-larly vulnerable to the degradation of its natural capital. Increased nitro-gen loading can result in widespread aquatic ecosystem degradation including: harmful algal blooms, increased turbidity, hypoxia, loss of aquatic vegetation and habitat and fish kills, it is also one of the mecha-nisms driving aquatic weed invasions. Understanding the fate and pro-cessing of anthropogenic nutrients in natural systems is therefore criti-cal for both preserving the well-being and biotic heritage for future gen-erations as well as providing a tremendous opportunity to improve the management driven by science. The objectives of this study were to evaluate the feasibility of mapping anthropogenic pollution through sta-ble isotopes signatures of aquatic plants, to investigate the potential for identifying different pollution sources, concentrations and distributions in a freshwater environment and to determine the utility of these tech-niques in indentifying early eutrophication.
- Full Text:
- Date Issued: 2011
- Authors: Hill, Jaclyn M , Kaehler, Sven , Hill, Martin P , Coetzee, Julie A
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444491 , vital:74245 , https://www.wrc.org.za/wp-content/uploads/mdocs/KV 280.pdf
- Description: Global increases in urbanization and anthropogenic activity within wa-tersheds and catchment areas have resulted in excessive nitrogen loads in aquatic ecosystems. South Africa is deeply dependent on nat-ural resources for its economic health and as a consequence is particu-larly vulnerable to the degradation of its natural capital. Increased nitro-gen loading can result in widespread aquatic ecosystem degradation including: harmful algal blooms, increased turbidity, hypoxia, loss of aquatic vegetation and habitat and fish kills, it is also one of the mecha-nisms driving aquatic weed invasions. Understanding the fate and pro-cessing of anthropogenic nutrients in natural systems is therefore criti-cal for both preserving the well-being and biotic heritage for future gen-erations as well as providing a tremendous opportunity to improve the management driven by science. The objectives of this study were to evaluate the feasibility of mapping anthropogenic pollution through sta-ble isotopes signatures of aquatic plants, to investigate the potential for identifying different pollution sources, concentrations and distributions in a freshwater environment and to determine the utility of these tech-niques in indentifying early eutrophication.
- Full Text:
- Date Issued: 2011
A status assessment of mangrove forests in South Africa and the utilization of mangroves at Mngazana Estuary
- Authors: Rajkaran, Anusha
- Date: 2011
- Subjects: Mangrove forests -- Management , Forests and forestry -- Harvesting , Mangrove forests -- South Africa -- Mngazana Estuary , Mangrove ecology -- South Africa -- Mngazana Estuary , Mangrove conservation
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:10604 , http://hdl.handle.net/10948/1547 , Mangrove forests -- Management , Forests and forestry -- Harvesting , Mangrove forests -- South Africa -- Mngazana Estuary , Mangrove ecology -- South Africa -- Mngazana Estuary , Mangrove conservation
- Description: In South Africa mangrove forests are located in estuaries from Kosi Bay in KwaZulu-Natal (KZN) to Nahoon Estuary in the Eastern Cape. The aims of this study were to determine the present state of mangroves in KwaZulu-Natal, by assessing the current population structure, the changes in cover over time and associated anthropogenic pressures. A second objective of this study was to determine the effect of harvesting on the population structure and sediment characteristics in the Mngazana mangrove forest. To determine if harvesting was sustainable at Mngazana Estuary; the growth and mortality rates and associated growth conditions were measured. Finally by using population modelling sustainable harvesting limits were determined by predicting the change in population structure over time. The study focussed on the KwaZulu-Natal province as a fairly recent study addressed mangrove distribution and status in the Eastern Cape Province. A historical assessment of all mangroves forests in KwaZulu-Natal (KZN) revealed that the potential threats to mangroves in South Africa include; wood harvesting, altered water flow patterns coupled with salinity changes, prolonged closed-mouth conditions and subsequent changes to the intertidal habitat. As a result mangroves were completely lost from eleven estuaries in KZN between 1982 and 1999 and a further two estuaries by 2006. Mangroves only occurred in those estuaries where the mouth was open for more than 56 percent of the time with the exception of St Lucia, where the mouth has been closed for longer but the mangrove communities have persisted because the roots of the trees were not submerged. All mangrove forests in KZN were regenerating in terms of population structure as they had reverse J-shaped population curves as well as high adult: seedling ratios. Kosi Bay and Mhlathuze Estuary were two of the larger forests that showed signs of harvesting (presence of tree or branch stumps), but the greatest threat to smaller estuaries seems to be altered water flow patterns due to freshwater abstraction in the catchments and the change of land use from natural vegetation to sugar-cane plantations. These threats affect the hydrology of estuaries and the sediment characteristics (particle size, redox, pH, salinity, temperature) of the mangrove forests. The environmental conditions under which the mangrove forests currently exist were determined for five species. Lumnitzera racemosa and Ceriops tagal exhibited a narrow range of conditions as these species are only found at Kosi Bay, while Avicennia marina, Bruguiera gymnorrhiza and Rhizophora mucronata were found to exist under a wider range of conditions. The growth rate and response to environmental conditions of the three dominant species were important to determine as these species are impacted by harvesting. Mangrove growth rates were measured at Mngazana Estuary in the Eastern Cape, the third largest mangrove forest in South Africa. Areas of this estuary where mangroves harvesting has occurred, show significant differences in sediment characteristics as well as changes in population structure in harvested compared to non harvested sites. The growth rate (in terms of height) of Avicennia marina individuals increased from seedlings (0.31 cm month-1) to adults (1.2 cm month-1), while the growth of Bruguiera gymnorrhiza stabilised from a height of 150 cm at 0.65 cm month-1. The growth of Rhizophora mucronata peaked at 0.72 cm month-1 (height 151-250 cm) and then decreased to 0.4 cm month-1 for taller individuals. Increases in diameter at breast height (DBH) ranged between 0.7 and 2.3 mm month-1 for all species. Some environmental variables were found to be important drivers of growth and mortality of individuals less then 150 cm. A decrease in sediment pH significantly increased the mortality of Avicennia marina seedlings (0-50 cm) (r = - 0.71, p<0.05) and significantly decreased the growth of Rhizophora mucronata and Bruguiera gymnorrhiza seedlings (r = -0.8, r = 0.52 – p < 0.05 respectively). At Mngazana Estuary, mortality of this species showed a positive correlation with sediment moisture content indicating that this species prefers drier conditions. The density of Rhizophora mucronata was significantly correlated to porewater temperature in Northern KZN as was the growth of adult (>300 cm) Rhizophora trees at Mngazana Estuary. Mortality of Avicennia marina individuals (51-150 cm) was related to tree density indicating intraspecific competition and self thinning. Selective harvesting of particular size classes of Rhizophora mucronata was recorded when comparing length of harvested poles (~301 cm) and the size class distribution of individuals. Taking into account the differences in growth rate for each size class for this species it will take approximately 13 years to attain a height of 390 cm which is the height at which trees are selected for harvesting at this estuary. This is 2.6 times slower than those individuals growing in Kenya. The feasibility of harvesting is dependent on the growth rate of younger size classes to replace harvested trees as well as the rate of natural recruitment feeding into the population. Different harvesting intensity scenarios tested within a matrix model framework showed that limits should be set at 5 percent trees ha-1 year-1 to maintain seedling density at > 5 000 ha-1 for R. mucronata. However harvesting of Bruguiera gymnorrhiza should be stopped due to the low density of this species at Mngazana Estuary. Harvesting of the tallest trees of Avicennia marina can be maintained at levels less than 10 percent ha-1 year-1. Effective management of mangrove forests in South African is important to maintain the current state, function and diversity of these ecosystems. Management recommendations should begin with determining the freshwater requirements of the estuaries to maintain the mouth dynamics and biotic communities and deter the harvesting of (whole) adult trees particularly those species that do not coppice. Further management is needed to ensure that forests are cleared of pollutants (plastic and industrial), and any further developments near the mangroves should be minimized.
- Full Text:
- Date Issued: 2011
- Authors: Rajkaran, Anusha
- Date: 2011
- Subjects: Mangrove forests -- Management , Forests and forestry -- Harvesting , Mangrove forests -- South Africa -- Mngazana Estuary , Mangrove ecology -- South Africa -- Mngazana Estuary , Mangrove conservation
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:10604 , http://hdl.handle.net/10948/1547 , Mangrove forests -- Management , Forests and forestry -- Harvesting , Mangrove forests -- South Africa -- Mngazana Estuary , Mangrove ecology -- South Africa -- Mngazana Estuary , Mangrove conservation
- Description: In South Africa mangrove forests are located in estuaries from Kosi Bay in KwaZulu-Natal (KZN) to Nahoon Estuary in the Eastern Cape. The aims of this study were to determine the present state of mangroves in KwaZulu-Natal, by assessing the current population structure, the changes in cover over time and associated anthropogenic pressures. A second objective of this study was to determine the effect of harvesting on the population structure and sediment characteristics in the Mngazana mangrove forest. To determine if harvesting was sustainable at Mngazana Estuary; the growth and mortality rates and associated growth conditions were measured. Finally by using population modelling sustainable harvesting limits were determined by predicting the change in population structure over time. The study focussed on the KwaZulu-Natal province as a fairly recent study addressed mangrove distribution and status in the Eastern Cape Province. A historical assessment of all mangroves forests in KwaZulu-Natal (KZN) revealed that the potential threats to mangroves in South Africa include; wood harvesting, altered water flow patterns coupled with salinity changes, prolonged closed-mouth conditions and subsequent changes to the intertidal habitat. As a result mangroves were completely lost from eleven estuaries in KZN between 1982 and 1999 and a further two estuaries by 2006. Mangroves only occurred in those estuaries where the mouth was open for more than 56 percent of the time with the exception of St Lucia, where the mouth has been closed for longer but the mangrove communities have persisted because the roots of the trees were not submerged. All mangrove forests in KZN were regenerating in terms of population structure as they had reverse J-shaped population curves as well as high adult: seedling ratios. Kosi Bay and Mhlathuze Estuary were two of the larger forests that showed signs of harvesting (presence of tree or branch stumps), but the greatest threat to smaller estuaries seems to be altered water flow patterns due to freshwater abstraction in the catchments and the change of land use from natural vegetation to sugar-cane plantations. These threats affect the hydrology of estuaries and the sediment characteristics (particle size, redox, pH, salinity, temperature) of the mangrove forests. The environmental conditions under which the mangrove forests currently exist were determined for five species. Lumnitzera racemosa and Ceriops tagal exhibited a narrow range of conditions as these species are only found at Kosi Bay, while Avicennia marina, Bruguiera gymnorrhiza and Rhizophora mucronata were found to exist under a wider range of conditions. The growth rate and response to environmental conditions of the three dominant species were important to determine as these species are impacted by harvesting. Mangrove growth rates were measured at Mngazana Estuary in the Eastern Cape, the third largest mangrove forest in South Africa. Areas of this estuary where mangroves harvesting has occurred, show significant differences in sediment characteristics as well as changes in population structure in harvested compared to non harvested sites. The growth rate (in terms of height) of Avicennia marina individuals increased from seedlings (0.31 cm month-1) to adults (1.2 cm month-1), while the growth of Bruguiera gymnorrhiza stabilised from a height of 150 cm at 0.65 cm month-1. The growth of Rhizophora mucronata peaked at 0.72 cm month-1 (height 151-250 cm) and then decreased to 0.4 cm month-1 for taller individuals. Increases in diameter at breast height (DBH) ranged between 0.7 and 2.3 mm month-1 for all species. Some environmental variables were found to be important drivers of growth and mortality of individuals less then 150 cm. A decrease in sediment pH significantly increased the mortality of Avicennia marina seedlings (0-50 cm) (r = - 0.71, p<0.05) and significantly decreased the growth of Rhizophora mucronata and Bruguiera gymnorrhiza seedlings (r = -0.8, r = 0.52 – p < 0.05 respectively). At Mngazana Estuary, mortality of this species showed a positive correlation with sediment moisture content indicating that this species prefers drier conditions. The density of Rhizophora mucronata was significantly correlated to porewater temperature in Northern KZN as was the growth of adult (>300 cm) Rhizophora trees at Mngazana Estuary. Mortality of Avicennia marina individuals (51-150 cm) was related to tree density indicating intraspecific competition and self thinning. Selective harvesting of particular size classes of Rhizophora mucronata was recorded when comparing length of harvested poles (~301 cm) and the size class distribution of individuals. Taking into account the differences in growth rate for each size class for this species it will take approximately 13 years to attain a height of 390 cm which is the height at which trees are selected for harvesting at this estuary. This is 2.6 times slower than those individuals growing in Kenya. The feasibility of harvesting is dependent on the growth rate of younger size classes to replace harvested trees as well as the rate of natural recruitment feeding into the population. Different harvesting intensity scenarios tested within a matrix model framework showed that limits should be set at 5 percent trees ha-1 year-1 to maintain seedling density at > 5 000 ha-1 for R. mucronata. However harvesting of Bruguiera gymnorrhiza should be stopped due to the low density of this species at Mngazana Estuary. Harvesting of the tallest trees of Avicennia marina can be maintained at levels less than 10 percent ha-1 year-1. Effective management of mangrove forests in South African is important to maintain the current state, function and diversity of these ecosystems. Management recommendations should begin with determining the freshwater requirements of the estuaries to maintain the mouth dynamics and biotic communities and deter the harvesting of (whole) adult trees particularly those species that do not coppice. Further management is needed to ensure that forests are cleared of pollutants (plastic and industrial), and any further developments near the mangroves should be minimized.
- Full Text:
- Date Issued: 2011
A strange counterpoint : classical music performance and identities in Grahamstown, South Africa
- Marais, Terence Wilmot Eugene
- Authors: Marais, Terence Wilmot Eugene
- Date: 2011
- Subjects: Music -- Western influences Music -- Performance -- Psychological aspects Music appreciation -- South Africa -- Grahamstown Music -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2677 , http://hdl.handle.net/10962/d1007491
- Description: This study investigates the perceptions of South African practitioners of Western European Art Music (WEAM), specifically as they relate to the value of WEAM in contemporary South African society. In exploring some of the connections between musical identity and national identity, it sets out to discover what value WEAM holds for a certain group of student pianists. Qualitative empirical data was collected in the form of in-depth, semi-structured interviews and questionnaire responses, and the findings point to numerous, nuanced expressions of self and varied intersections of the nation with musical identity in the life of the individual. Further, WEAM appears to represent a crucial point of identification for these individuals, in each case generating positive affirmations of the self.
- Full Text:
- Date Issued: 2011
- Authors: Marais, Terence Wilmot Eugene
- Date: 2011
- Subjects: Music -- Western influences Music -- Performance -- Psychological aspects Music appreciation -- South Africa -- Grahamstown Music -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2677 , http://hdl.handle.net/10962/d1007491
- Description: This study investigates the perceptions of South African practitioners of Western European Art Music (WEAM), specifically as they relate to the value of WEAM in contemporary South African society. In exploring some of the connections between musical identity and national identity, it sets out to discover what value WEAM holds for a certain group of student pianists. Qualitative empirical data was collected in the form of in-depth, semi-structured interviews and questionnaire responses, and the findings point to numerous, nuanced expressions of self and varied intersections of the nation with musical identity in the life of the individual. Further, WEAM appears to represent a crucial point of identification for these individuals, in each case generating positive affirmations of the self.
- Full Text:
- Date Issued: 2011
A study of a class of invariant optimal control problems on the Euclidean group SE(2)
- Authors: Adams, Ross Montague
- Date: 2011
- Subjects: Matrix groups Lie groups Extremal problems (Mathematics) Maximum principles (Mathematics) Hamilton-Jacobi equations Lyapunov stability
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5420 , http://hdl.handle.net/10962/d1006060
- Description: The aim of this thesis is to study a class of left-invariant optimal control problems on the matrix Lie group SE(2). We classify, under detached feedback equivalence, all controllable (left-invariant) control affine systems on SE(2). This result produces six types of control affine systems on SE(2). Hence, we study six associated left-invariant optimal control problems on SE(2). A left-invariant optimal control problem consists of minimizing a cost functional over the trajectory-control pairs of a left-invariant control system subject to appropriate boundary conditions. Each control problem is lifted from SE(2) to T*SE(2) ≅ SE(2) x se (2)*and then reduced to a problem on se (2)*. The maximum principle is used to obtain the optimal control and Hamiltonian corresponding to the normal extremals. Then we derive the (reduced) extremal equations on se (2)*. These equations are explicitly integrated by trigonometric and Jacobi elliptic functions. Finally, we fully classify, under Lyapunov stability, the equilibrium states of the normal extremal equations for each of the six types under consideration.
- Full Text:
- Date Issued: 2011
- Authors: Adams, Ross Montague
- Date: 2011
- Subjects: Matrix groups Lie groups Extremal problems (Mathematics) Maximum principles (Mathematics) Hamilton-Jacobi equations Lyapunov stability
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5420 , http://hdl.handle.net/10962/d1006060
- Description: The aim of this thesis is to study a class of left-invariant optimal control problems on the matrix Lie group SE(2). We classify, under detached feedback equivalence, all controllable (left-invariant) control affine systems on SE(2). This result produces six types of control affine systems on SE(2). Hence, we study six associated left-invariant optimal control problems on SE(2). A left-invariant optimal control problem consists of minimizing a cost functional over the trajectory-control pairs of a left-invariant control system subject to appropriate boundary conditions. Each control problem is lifted from SE(2) to T*SE(2) ≅ SE(2) x se (2)*and then reduced to a problem on se (2)*. The maximum principle is used to obtain the optimal control and Hamiltonian corresponding to the normal extremals. Then we derive the (reduced) extremal equations on se (2)*. These equations are explicitly integrated by trigonometric and Jacobi elliptic functions. Finally, we fully classify, under Lyapunov stability, the equilibrium states of the normal extremal equations for each of the six types under consideration.
- Full Text:
- Date Issued: 2011
A study of mathematics instructional practices in foundation phase grade three classrooms in East London
- Authors: Williams, Beverley Diana
- Date: 2011
- Subjects: Mathematics--Study and teaching (Primary) http://id.loc.gov/authorities/subjects/sh85082164 , Mathematics--Study and teaching (Elementary) http://id.loc.gov/authorities/subjects/sh85082163
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/19585 , vital:43146
- Description: This study describes the instructional practices of grade three teachers in their attempt to facilitate mathematical learning. The teachers’ practices are described in relation to the requirements of the revised National Curriculum Statement. In order to demarcate the field of investigation, the researcher provides an overview of the historical background of the study and draws attention to the knowledge interest of the investigation. The problem, the research questions, the assumptions of the study, the significance of the study, the rationale and the delimitation of the study are all set out in this chapter. A list of the major terms used in the study is also given. In concluding the chapter and outline of the issues discussed in each of the five chapters is given. , Thesis (MEd) -- University of Fort Hare, 2011
- Full Text:
- Date Issued: 2011
- Authors: Williams, Beverley Diana
- Date: 2011
- Subjects: Mathematics--Study and teaching (Primary) http://id.loc.gov/authorities/subjects/sh85082164 , Mathematics--Study and teaching (Elementary) http://id.loc.gov/authorities/subjects/sh85082163
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/19585 , vital:43146
- Description: This study describes the instructional practices of grade three teachers in their attempt to facilitate mathematical learning. The teachers’ practices are described in relation to the requirements of the revised National Curriculum Statement. In order to demarcate the field of investigation, the researcher provides an overview of the historical background of the study and draws attention to the knowledge interest of the investigation. The problem, the research questions, the assumptions of the study, the significance of the study, the rationale and the delimitation of the study are all set out in this chapter. A list of the major terms used in the study is also given. In concluding the chapter and outline of the issues discussed in each of the five chapters is given. , Thesis (MEd) -- University of Fort Hare, 2011
- Full Text:
- Date Issued: 2011