The significance of participation in capacity development and project sustainability: a case study of the Zimbabwe Secondary Teacher Training Environmental Education Project (St²eep)
- Authors: Van Ongevalle, Jan
- Date: 2007
- Subjects: High school teachers -- Training of -- Zimbabwe Environmental education -- Study and teaching (secondary) -- Zimbabwe Environmental education -- Curricula -- Case studies -- Zimbabwe Environmental education -- Curricula -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1766 , http://hdl.handle.net/10962/d1003651
- Description: This study uses a systems thinking perspective to explore the role and meaning of participation, capacity development and project sustainability in the Zimbabwe Secondary Teacher Training Environmental Education Project (St²eep). Since there was no consistent critical reflection upon the different assumptions that underpin these important aspects of St²eep in the original project design, this study aims to articulate a theoretical framework for guiding the project. St2eep is a donorfunded project, located in the Ministry of Higher and Tertiary Education in Zimbabwe that seeks to integrate environmental education across the curriculum of secondary teacher education. The study first develops a theoretical framework drawing on systems thinking. In particular it uses the holistic and constructivist perspectives embedded in systems thinking to describe a number of analytic frameworks that are used as a guide to investigate participation, capacity development and project sustainability in the St²eep case study. The research methodology comprises a qualitative case study approach, which contains elements of an instrumental, evaluative and critical case study. Data-collection methods include document analysis, focus group discussions, focus group interviews, semi-structured face-to-face interviews and participant observation. Data analysis follows the constant comparative method of coding and categorising data as outlined by Strauss and Corbin (1998). The outcomes of this research show that participation processes in St²eep evolve around the interactions between a political dimension and a learning dimension. The political dimension relates to giving the project stakeholders a critical voice, allowing them to shape the project and involving them in the decision-making process. This approach has fostered an ongoing learning process in a small team of committed stakeholders based on the principles of collaborative learning, team learning and action research. Participation was shown to enhance capacity-development processes at individual and institutional level by the provision of support through learning teams, and by the renegotiation of responsibilities and power relations between lecturers involved in St²eep, donor representatives and college administrations. The strong operational role of the donor organisation was seen as a serious threat towards individual and institutional capacity development since it creates a functional but artificial and independent project system within the college system and takes over any local institutional support structure that it might seek to develop. Fostering continuous learning and capacity development, St²eep’s participatory approach was shown to contribute to a better understanding of the interconnectedness of factors that influence future sustainability of the project and the implementation of environmental education. This has assisted in the development of different scenarios on the sustainability of the project. The research shows that the project-ustainability planning process draws directly from St²eep’s ongoing learning process, with individual and institutional capacity development featuring strongly in the different scenarios, and with the external context such as the economic situation and the low priority of environmental education being recognised as important factors that need to be considered. Drawing on the findings from the case study, this study makes a tentative recommendation that donor organisations should focus more on capacity-development initiatives and avoid taking on a strong operational role in project activities. The research also recommends that there is need for a deliberate focus on both the political and learning dimensions of the participation process in order to foster local ownership. Making the learning aspect much more central in St²eep is presented as a possible strategy for motivating a larger number of college lecturers to become involved in the project and the implementation of environmental education. The study also urges St²eep to combine the different scenarios that have emerged during the project sustainability planning process and to focus on the benefits that stakeholders want to see sustained.
- Full Text:
- Date Issued: 2007
- Authors: Van Ongevalle, Jan
- Date: 2007
- Subjects: High school teachers -- Training of -- Zimbabwe Environmental education -- Study and teaching (secondary) -- Zimbabwe Environmental education -- Curricula -- Case studies -- Zimbabwe Environmental education -- Curricula -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1766 , http://hdl.handle.net/10962/d1003651
- Description: This study uses a systems thinking perspective to explore the role and meaning of participation, capacity development and project sustainability in the Zimbabwe Secondary Teacher Training Environmental Education Project (St²eep). Since there was no consistent critical reflection upon the different assumptions that underpin these important aspects of St²eep in the original project design, this study aims to articulate a theoretical framework for guiding the project. St2eep is a donorfunded project, located in the Ministry of Higher and Tertiary Education in Zimbabwe that seeks to integrate environmental education across the curriculum of secondary teacher education. The study first develops a theoretical framework drawing on systems thinking. In particular it uses the holistic and constructivist perspectives embedded in systems thinking to describe a number of analytic frameworks that are used as a guide to investigate participation, capacity development and project sustainability in the St²eep case study. The research methodology comprises a qualitative case study approach, which contains elements of an instrumental, evaluative and critical case study. Data-collection methods include document analysis, focus group discussions, focus group interviews, semi-structured face-to-face interviews and participant observation. Data analysis follows the constant comparative method of coding and categorising data as outlined by Strauss and Corbin (1998). The outcomes of this research show that participation processes in St²eep evolve around the interactions between a political dimension and a learning dimension. The political dimension relates to giving the project stakeholders a critical voice, allowing them to shape the project and involving them in the decision-making process. This approach has fostered an ongoing learning process in a small team of committed stakeholders based on the principles of collaborative learning, team learning and action research. Participation was shown to enhance capacity-development processes at individual and institutional level by the provision of support through learning teams, and by the renegotiation of responsibilities and power relations between lecturers involved in St²eep, donor representatives and college administrations. The strong operational role of the donor organisation was seen as a serious threat towards individual and institutional capacity development since it creates a functional but artificial and independent project system within the college system and takes over any local institutional support structure that it might seek to develop. Fostering continuous learning and capacity development, St²eep’s participatory approach was shown to contribute to a better understanding of the interconnectedness of factors that influence future sustainability of the project and the implementation of environmental education. This has assisted in the development of different scenarios on the sustainability of the project. The research shows that the project-ustainability planning process draws directly from St²eep’s ongoing learning process, with individual and institutional capacity development featuring strongly in the different scenarios, and with the external context such as the economic situation and the low priority of environmental education being recognised as important factors that need to be considered. Drawing on the findings from the case study, this study makes a tentative recommendation that donor organisations should focus more on capacity-development initiatives and avoid taking on a strong operational role in project activities. The research also recommends that there is need for a deliberate focus on both the political and learning dimensions of the participation process in order to foster local ownership. Making the learning aspect much more central in St²eep is presented as a possible strategy for motivating a larger number of college lecturers to become involved in the project and the implementation of environmental education. The study also urges St²eep to combine the different scenarios that have emerged during the project sustainability planning process and to focus on the benefits that stakeholders want to see sustained.
- Full Text:
- Date Issued: 2007
The politics of planning in Eastern Cape local government: a case study of Ngqushwa and Buffalo City, 1998-2004
- Authors: Hollands, Glenn Delroy
- Date: 2007
- Subjects: Buffalo City (South Africa) Local government -- South Africa -- Eastern Cape -- Case studies Municipal government -- South Africa -- Eastern Cape -- Case studies Political planning -- South Africa -- Eastern Cape Eastern Cape (South Africa) -- History -- 20th century Eastern Cape (South Africa) -- History -- 21st century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2875 , http://hdl.handle.net/10962/d1008199
- Description: This thesis examines the political implications of the integrated development planning process embarked upon by South African municipalities in the period 1998-2004. Through the use of case study methodology that focuses on the Eastern Cape municipalities of Buffalo City and Ngqushwa, the conventions of municipal planning are examined. This inquiry into municipal planning draws upon official government documents and reports and publications from the nongovernment sector. The thesis is particularly focused on the claims made in policy documents and related secondary sources and compares these to more critical reports and publication as well as the author's personal experience of the integrated development planning process. Of key interest is the possibility that planning serves political interests and the material needs of an emerging municipal elite and that this is seldom acknowledged in official planning documentation or government sanctioned publications on the topic. The primary findings of the thesis are as follows: • That the 'reason' of expert policy formulations that accompanied integrated development planning has weakened political economy as a prism of understanding and separated itself from the institutional reality of municipal government • That the dominant critique of planning and other post-apartheid municipal policy is concerned with the triumph of neoliberalism but this critique, while valid, does not fully explain successive policy failures especially in the setting of Eastern Cape local government • That function of policy and its relationship to both the state and civil society is usually understood only in the most obvious sense and not as an instrument for wielding political power • That planning still derives much of its influence from its claim to technical rationality and that this underpinned the 'authority' of the integrated development planning project in South Africa and reinforced its power to make communities governable.
- Full Text:
- Date Issued: 2007
- Authors: Hollands, Glenn Delroy
- Date: 2007
- Subjects: Buffalo City (South Africa) Local government -- South Africa -- Eastern Cape -- Case studies Municipal government -- South Africa -- Eastern Cape -- Case studies Political planning -- South Africa -- Eastern Cape Eastern Cape (South Africa) -- History -- 20th century Eastern Cape (South Africa) -- History -- 21st century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2875 , http://hdl.handle.net/10962/d1008199
- Description: This thesis examines the political implications of the integrated development planning process embarked upon by South African municipalities in the period 1998-2004. Through the use of case study methodology that focuses on the Eastern Cape municipalities of Buffalo City and Ngqushwa, the conventions of municipal planning are examined. This inquiry into municipal planning draws upon official government documents and reports and publications from the nongovernment sector. The thesis is particularly focused on the claims made in policy documents and related secondary sources and compares these to more critical reports and publication as well as the author's personal experience of the integrated development planning process. Of key interest is the possibility that planning serves political interests and the material needs of an emerging municipal elite and that this is seldom acknowledged in official planning documentation or government sanctioned publications on the topic. The primary findings of the thesis are as follows: • That the 'reason' of expert policy formulations that accompanied integrated development planning has weakened political economy as a prism of understanding and separated itself from the institutional reality of municipal government • That the dominant critique of planning and other post-apartheid municipal policy is concerned with the triumph of neoliberalism but this critique, while valid, does not fully explain successive policy failures especially in the setting of Eastern Cape local government • That function of policy and its relationship to both the state and civil society is usually understood only in the most obvious sense and not as an instrument for wielding political power • That planning still derives much of its influence from its claim to technical rationality and that this underpinned the 'authority' of the integrated development planning project in South Africa and reinforced its power to make communities governable.
- Full Text:
- Date Issued: 2007
Segregated housing and contested identities: the case of the King William's Town coloured community, 1895 - 1946
- Authors: Victor, Stephanie Emilia
- Date: 2007
- Subjects: Colored people (South Africa) -- Race identity Colored people (South Africa) -- Political activity South Africa -- Race relations Colored people (South Africa) -- Housing Housing -- South Africa -- King William's Town Colored people (South Africa) -- Relocation Colored people (South Africa) -- South Africa -- King William's Town
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2568 , http://hdl.handle.net/10962/d1002421
- Description: This thesis is a case study of the dynamics of coloured housing in King William's Town between 1895 and 1946. The impact of spatial segregation on pre-apartheid coloured settlements in the Eastern Cape has largely been ignored up to the present. This needs to be rectified as the lack of in-depth enquiry can lead to misinterpretations that may influence contemporary politics and identity formation. Through research based on primary sources, it has become apparent that segregation in King William's Town was safeguarded and rationalized through the discourses of sanitation and civilization, and the practices of relocation and removal. The existing slum cond itions were used as a convenient excuse to implement municipal control. Segregation compounded the problem of poverty, inequitable access to housing and the provision of basic services. As a result, local coloured housing was increasingly characterised by a shortage of decent accommodation and basic services, decreasing home ownership and increasing municipal tenancy. In addition, through the implementation of the 1923 Natives (Urban Areas) Act and the 1934 Slums Act, high sanitation standards were set, but the Council itself provided inferior services. Ironically, conditions in the relocated municipal settlements were also not on par with the provisions stipulated in the Slums Act that were used to effect removal in the first place. The implementation of racially exclusive housing was, therefore, not driven by a single role player. It was pioneered by the local authorities, legalised by national government and supported by the coloured elite, when needed, in an attempt to access decent housing. This occurred mainly through the political manoeuvring of the coloured elite, and specifically the African Political (later People's) Organisation (APO), the Afrikaanse Nasionale Bond (AN B) and the locally constituted Coloured Welfare Association (CWA) in King William 's Town. These organisations attempted to procure access to housing within the narrow boundaries of a prescribed identity. Segregated housing therefore fostered and sustained coloured identity. It consolidated feelings of separateness and division and provided impetus for the construction of race and even racial tension. Coloured identity attempted to serve as a rallying point to overcome differences in religion, family and social networks and place of residence in order to procure access to housing. It was not, however, able to overcome the occasional division between settlements, caused by well-developed placeidentities, which still inform the contemporary housing milieu. The coloured elite initially did not question the legitimacy of coloured identity. Only in 1939, under threats of increased residential segregation, combined with the resulting opposition in coloured protest politics, was the legitimacy of coloured identity publicly contested . By 1943, with the creation of the Coloured Advisory Council (CAC), local coloured unity proved to be insufficient. A division within the ranks of the local coloured elite was evident. As a result, the expression of coloured identity still remains contested in contemporary King William's Town.
- Full Text:
- Date Issued: 2007
- Authors: Victor, Stephanie Emilia
- Date: 2007
- Subjects: Colored people (South Africa) -- Race identity Colored people (South Africa) -- Political activity South Africa -- Race relations Colored people (South Africa) -- Housing Housing -- South Africa -- King William's Town Colored people (South Africa) -- Relocation Colored people (South Africa) -- South Africa -- King William's Town
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2568 , http://hdl.handle.net/10962/d1002421
- Description: This thesis is a case study of the dynamics of coloured housing in King William's Town between 1895 and 1946. The impact of spatial segregation on pre-apartheid coloured settlements in the Eastern Cape has largely been ignored up to the present. This needs to be rectified as the lack of in-depth enquiry can lead to misinterpretations that may influence contemporary politics and identity formation. Through research based on primary sources, it has become apparent that segregation in King William's Town was safeguarded and rationalized through the discourses of sanitation and civilization, and the practices of relocation and removal. The existing slum cond itions were used as a convenient excuse to implement municipal control. Segregation compounded the problem of poverty, inequitable access to housing and the provision of basic services. As a result, local coloured housing was increasingly characterised by a shortage of decent accommodation and basic services, decreasing home ownership and increasing municipal tenancy. In addition, through the implementation of the 1923 Natives (Urban Areas) Act and the 1934 Slums Act, high sanitation standards were set, but the Council itself provided inferior services. Ironically, conditions in the relocated municipal settlements were also not on par with the provisions stipulated in the Slums Act that were used to effect removal in the first place. The implementation of racially exclusive housing was, therefore, not driven by a single role player. It was pioneered by the local authorities, legalised by national government and supported by the coloured elite, when needed, in an attempt to access decent housing. This occurred mainly through the political manoeuvring of the coloured elite, and specifically the African Political (later People's) Organisation (APO), the Afrikaanse Nasionale Bond (AN B) and the locally constituted Coloured Welfare Association (CWA) in King William 's Town. These organisations attempted to procure access to housing within the narrow boundaries of a prescribed identity. Segregated housing therefore fostered and sustained coloured identity. It consolidated feelings of separateness and division and provided impetus for the construction of race and even racial tension. Coloured identity attempted to serve as a rallying point to overcome differences in religion, family and social networks and place of residence in order to procure access to housing. It was not, however, able to overcome the occasional division between settlements, caused by well-developed placeidentities, which still inform the contemporary housing milieu. The coloured elite initially did not question the legitimacy of coloured identity. Only in 1939, under threats of increased residential segregation, combined with the resulting opposition in coloured protest politics, was the legitimacy of coloured identity publicly contested . By 1943, with the creation of the Coloured Advisory Council (CAC), local coloured unity proved to be insufficient. A division within the ranks of the local coloured elite was evident. As a result, the expression of coloured identity still remains contested in contemporary King William's Town.
- Full Text:
- Date Issued: 2007
The impact of load and frequency on the biomechanical, physiological and perceptual responses to dynamic pushing
- Authors: Cripwell, Adam Michael
- Date: 2007
- Subjects: Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5144 , http://hdl.handle.net/10962/d1008183 , Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Description: The objective of the present research was to establish the biomechanical, physiological and perceptual responses of male operators to dynamic pushing tasks. The pushing tasks were performed using an industrial pallet jack with varying load/frequency combinations, in a controlled laboratory environment. Thirty healthy male subjects comprised the sample. Experimental procedures were conducted utilising the Chatillon ™ Dynamometer to measure force output in the initial, sustained and ending phases. The K4b2 Ergospirometer was used to assess physiological responses (heart rate and oxygen consumption [V02])' Nine recorded forces and nine experimental conditions formed the basis of this study, with subjects required to push three loads (200kg, 350kg, 500kg) at three frequencies (1120 sec, 1/40 sec, 1/60 sec) at a speed of 3.6km.h-1 over 14 metres on a co-efficient of friction controlled walkway for six minutes. Gait analysis, along with perceptions of exertion (,Central ' and 'Local' RPE) were collected during the third and sixth minutes of each condition . Body discomfort and contribution were identified upon completion of each condition. The results demonstrated that load and frequency interacted to influence responses within each domain. Increasing loads required increased force output during each stage of the push, which had a concomitant effect on physiological and perceptual responses. Significant differences arose between the initial, sustained and ending forces for each load, showing the direct relationship between load and force exertion. The combination of heaviest load/quickest frequency required the greatest physiological output, exceeding recommended guidelines for heart rate, V02 and energy expenditure responses. Intermediate combinations required moderate and acceptable energy cost. Linear relationships were established between heart rate and oxygen consumption , as well as between load and V02 , thus providing industrial practitioners an opportunity to evaluate task demands in situ. The combination of high forces and elevated physiological responses increased the subjective rating of the condition. The results emphasise the need to holistically consider all contributing factors in a dynamic pushing task. Dynamic pushing tasks place biomechanical, physiological and perceptual demands on the human operator, which must be minimised in order to ensure that this form of manual materials handling becomes sustainable in the long term.
- Full Text:
- Date Issued: 2007
- Authors: Cripwell, Adam Michael
- Date: 2007
- Subjects: Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5144 , http://hdl.handle.net/10962/d1008183 , Work -- Physiological aspects , Psychophysiology , Human engineering , Biomechanics
- Description: The objective of the present research was to establish the biomechanical, physiological and perceptual responses of male operators to dynamic pushing tasks. The pushing tasks were performed using an industrial pallet jack with varying load/frequency combinations, in a controlled laboratory environment. Thirty healthy male subjects comprised the sample. Experimental procedures were conducted utilising the Chatillon ™ Dynamometer to measure force output in the initial, sustained and ending phases. The K4b2 Ergospirometer was used to assess physiological responses (heart rate and oxygen consumption [V02])' Nine recorded forces and nine experimental conditions formed the basis of this study, with subjects required to push three loads (200kg, 350kg, 500kg) at three frequencies (1120 sec, 1/40 sec, 1/60 sec) at a speed of 3.6km.h-1 over 14 metres on a co-efficient of friction controlled walkway for six minutes. Gait analysis, along with perceptions of exertion (,Central ' and 'Local' RPE) were collected during the third and sixth minutes of each condition . Body discomfort and contribution were identified upon completion of each condition. The results demonstrated that load and frequency interacted to influence responses within each domain. Increasing loads required increased force output during each stage of the push, which had a concomitant effect on physiological and perceptual responses. Significant differences arose between the initial, sustained and ending forces for each load, showing the direct relationship between load and force exertion. The combination of heaviest load/quickest frequency required the greatest physiological output, exceeding recommended guidelines for heart rate, V02 and energy expenditure responses. Intermediate combinations required moderate and acceptable energy cost. Linear relationships were established between heart rate and oxygen consumption , as well as between load and V02 , thus providing industrial practitioners an opportunity to evaluate task demands in situ. The combination of high forces and elevated physiological responses increased the subjective rating of the condition. The results emphasise the need to holistically consider all contributing factors in a dynamic pushing task. Dynamic pushing tasks place biomechanical, physiological and perceptual demands on the human operator, which must be minimised in order to ensure that this form of manual materials handling becomes sustainable in the long term.
- Full Text:
- Date Issued: 2007
Nguni fermented foods: working with indigenous knowledge in the Life Sciences: a case study
- Authors: Hanisi, Nosipho
- Date: 2007
- Subjects: Life sciences -- Study and teaching (Secondary) -- South Africa -- Case studies Environmental education -- South Africa -- Case studies Fermented foods -- Case studies Fermentation Indigenous peoples -- Case studies Nguni (African people) -- Social life and customs. Xhosa (African people) -- Social life and customs. Ethnoscience
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1957 , http://hdl.handle.net/10962/d1008372
- Description: This study examines learning interactions around indigenous ways of knowing associated with fermented grain foods (the making of umqombothi) and the concept of alcoholic fermentation in the Grade 11 Life Sciences curriculum. As an environmental education study it also investigates the cultural significances of the fermented grain food and how learners might make better lifestyle choices. The inclusion of indigenous ways of knowing in the Life Sciences curriculum (FET band) created spaces and opportunities for the use of both knowledge's in sociocultural context and the structured propositions of the learning area in order to construct knowledge. This stimulated learners' understanding of fermentation and also led to a valuing of social context as well as the cultural capital embedded in the indigenous ways of knowing. The study suggests that parental involvement contributed to this valuing of intergenerational ways of knowing. Learners also deliberated how colonial interpretations of Nguni culture and the religious beliefs of Christians had served to marginalise and foster a widening urban rejection of isiXhosa cultural practices related to fermented foods. In their learning and discussion, learners developed new insights and respect for isiXhosa fermentation practices (ukudidiyela) that bring out the food value and nutrition in the grain. The data illustrates that lesson activity that drew on relevant Learning Outcomes and Assessment Standards to integrate Indigenous Knowledge practices in a Life Sciences learning programme, served to enhance learner understanding of alcoholic fermentation. They also document a revaluing of cultural heritage and learners bringing up the problem of alcohol abuse in the community. Curriculum work with Indigenous Knowledge thus not only assisted learners to grasp the science but to use this alongside a valued cultural knowledge capital to deliberate and act on a local concern.
- Full Text:
- Date Issued: 2007
- Authors: Hanisi, Nosipho
- Date: 2007
- Subjects: Life sciences -- Study and teaching (Secondary) -- South Africa -- Case studies Environmental education -- South Africa -- Case studies Fermented foods -- Case studies Fermentation Indigenous peoples -- Case studies Nguni (African people) -- Social life and customs. Xhosa (African people) -- Social life and customs. Ethnoscience
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1957 , http://hdl.handle.net/10962/d1008372
- Description: This study examines learning interactions around indigenous ways of knowing associated with fermented grain foods (the making of umqombothi) and the concept of alcoholic fermentation in the Grade 11 Life Sciences curriculum. As an environmental education study it also investigates the cultural significances of the fermented grain food and how learners might make better lifestyle choices. The inclusion of indigenous ways of knowing in the Life Sciences curriculum (FET band) created spaces and opportunities for the use of both knowledge's in sociocultural context and the structured propositions of the learning area in order to construct knowledge. This stimulated learners' understanding of fermentation and also led to a valuing of social context as well as the cultural capital embedded in the indigenous ways of knowing. The study suggests that parental involvement contributed to this valuing of intergenerational ways of knowing. Learners also deliberated how colonial interpretations of Nguni culture and the religious beliefs of Christians had served to marginalise and foster a widening urban rejection of isiXhosa cultural practices related to fermented foods. In their learning and discussion, learners developed new insights and respect for isiXhosa fermentation practices (ukudidiyela) that bring out the food value and nutrition in the grain. The data illustrates that lesson activity that drew on relevant Learning Outcomes and Assessment Standards to integrate Indigenous Knowledge practices in a Life Sciences learning programme, served to enhance learner understanding of alcoholic fermentation. They also document a revaluing of cultural heritage and learners bringing up the problem of alcohol abuse in the community. Curriculum work with Indigenous Knowledge thus not only assisted learners to grasp the science but to use this alongside a valued cultural knowledge capital to deliberate and act on a local concern.
- Full Text:
- Date Issued: 2007
A social realist account of the emergence of a formal academic staff development programme at a South African university
- Authors: Quinn, Lynn
- Date: 2007
- Subjects: Teachers -- Training of -- South Africa Education, Higher -- South Africa Graduate students -- South Africa Universities and colleges -- South Africa -- Graduate work
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1321 , http://hdl.handle.net/10962/d1003954
- Description: Using social realist theory and particularly the morphogenetic/morphostatic methodology advocated by Margaret Archer, this study offers a critical examination of the emergence of a formal academic staff development programme at a small South African university (SSAU). Archer’s morphogenetic approach enabled an investigation of the interface between culture, structure and agency (at macro, mezo and micro levels) in order to theorize about the material, ideational and agential conditions that obtained and which in turn enabled the emergence of the Postgraduate Diploma of Higher Education (PGDHE) at the SSAU. The study therefore advances concrete propositions about the cultural, structural and agential conditions for transformation which existed at a particular time in the history of higher education (and the subfield of educational development) which enabled the introduction of the PGDHE. Analysis of the data suggests that what occurred at SSAU was a disruption of the morphostatic synchrony between structure and culture brought about by new discourses and structures emanating from the broader international and national higher education context. In particular, it seems that attempts at reconciling the constraining contradictions between the discourses and structures related to quality assurance on the one hand and educational development on the other resulted in a conjunction between transformation at the levels of both the cultural system and social structure. This conjunction, along with the actions of key Institutional agents and the morphogenesis of the staff of the Educational Development Unit, created sufficiently enabling conditions in the Institution for the introduction of the PGDHE. The research adds to knowledge through insights into the contribution that the ideas, beliefs, values, ideologies and theories about higher education broadly and about educational development specifically make to enabling or constraining conditions for the professionalization of academic staff in higher education institutions. It uncovers how relevant structures at the international, national and institutional levels can shape the practice of educational development and specifically staff development. It has generated insights into how the relevant people and the positions they hold can impact on staff development practices. In summary, the research could contribute towards emancipatory knowledge which could be used by SSAU and educational development practitioners elsewhere to inform future planning and decision making in relation to educational development and more specifically staff development practices in their contexts.
- Full Text:
- Date Issued: 2007
- Authors: Quinn, Lynn
- Date: 2007
- Subjects: Teachers -- Training of -- South Africa Education, Higher -- South Africa Graduate students -- South Africa Universities and colleges -- South Africa -- Graduate work
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1321 , http://hdl.handle.net/10962/d1003954
- Description: Using social realist theory and particularly the morphogenetic/morphostatic methodology advocated by Margaret Archer, this study offers a critical examination of the emergence of a formal academic staff development programme at a small South African university (SSAU). Archer’s morphogenetic approach enabled an investigation of the interface between culture, structure and agency (at macro, mezo and micro levels) in order to theorize about the material, ideational and agential conditions that obtained and which in turn enabled the emergence of the Postgraduate Diploma of Higher Education (PGDHE) at the SSAU. The study therefore advances concrete propositions about the cultural, structural and agential conditions for transformation which existed at a particular time in the history of higher education (and the subfield of educational development) which enabled the introduction of the PGDHE. Analysis of the data suggests that what occurred at SSAU was a disruption of the morphostatic synchrony between structure and culture brought about by new discourses and structures emanating from the broader international and national higher education context. In particular, it seems that attempts at reconciling the constraining contradictions between the discourses and structures related to quality assurance on the one hand and educational development on the other resulted in a conjunction between transformation at the levels of both the cultural system and social structure. This conjunction, along with the actions of key Institutional agents and the morphogenesis of the staff of the Educational Development Unit, created sufficiently enabling conditions in the Institution for the introduction of the PGDHE. The research adds to knowledge through insights into the contribution that the ideas, beliefs, values, ideologies and theories about higher education broadly and about educational development specifically make to enabling or constraining conditions for the professionalization of academic staff in higher education institutions. It uncovers how relevant structures at the international, national and institutional levels can shape the practice of educational development and specifically staff development. It has generated insights into how the relevant people and the positions they hold can impact on staff development practices. In summary, the research could contribute towards emancipatory knowledge which could be used by SSAU and educational development practitioners elsewhere to inform future planning and decision making in relation to educational development and more specifically staff development practices in their contexts.
- Full Text:
- Date Issued: 2007
Address at the opening of the OutRhodes Pride Week, 21 August 2007
- Authors: Badat, Saleem
- Date: 2007
- Subjects: Rhodes University
- Language: English
- Type: text
- Identifier: vital:7652 , http://hdl.handle.net/10962/d1015780
- Full Text:
- Date Issued: 2007
- Authors: Badat, Saleem
- Date: 2007
- Subjects: Rhodes University
- Language: English
- Type: text
- Identifier: vital:7652 , http://hdl.handle.net/10962/d1015780
- Full Text:
- Date Issued: 2007
Social learning processes in a citrus farming community of practice
- Authors: Downsborough, Linda
- Date: 2007
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1878 , http://hdl.handle.net/10962/d1005859
- Description: Learning takes place in a number of ways. Situated learning for example, tries to shift the focus from the individual as a learner to the learner participating in the social world and from learning as a strictly cognitive process to a more encompassing view of social practice. The overall aim of this research was to gain a deeper understanding of the ways in which learning takes place in and between members of a citrus farming community, in other words it was to investigate the social learning processes. The research was undertaken in Patensie, a citrus farming community of the Gamtoos River Valley, Eastern Cape, South Africa. Data was generated through the use of interviews and informal discussions with participants together with document analysis, such as minutes of meetings. I also made observations of the learning interactions that were evident and also the interactions that were evident in the area as a whole. The data was analysed in two phases, the first involved reading across the interview transcripts and organizing the data under broad themes while the second phase made use of an analytical framework, a Community of Practice perspective to further analyze and engage with the data. I drew quite strongly on the ideas of situated learning, Communities of Practice and the notion of Legitimate Peripheral Participation (Lave & Wenger, 1991) as a means to understand, interpret and describe the social learning processes. The research highlighted that in this case study, citrus farmers learn in a number of sociological ways, for example through intergenerational learning (in the family), learning from each other in a Community of Practice, learning from private consultants and extensions officers as well as from other organizations and institutions. It also considered how farmers' learning had influenced land use practice in the area. This brought to the fore an emerging partnership with a conservation agent based on providing economic incentives to farmers to engage in sustainable landuse practices. It is hoped that this research may inform future educational endeavours by shedding light on the social learning processes and by drawing attention to key aspects of learning that may previously have been overlooked in research.
- Full Text:
- Date Issued: 2007
- Authors: Downsborough, Linda
- Date: 2007
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1878 , http://hdl.handle.net/10962/d1005859
- Description: Learning takes place in a number of ways. Situated learning for example, tries to shift the focus from the individual as a learner to the learner participating in the social world and from learning as a strictly cognitive process to a more encompassing view of social practice. The overall aim of this research was to gain a deeper understanding of the ways in which learning takes place in and between members of a citrus farming community, in other words it was to investigate the social learning processes. The research was undertaken in Patensie, a citrus farming community of the Gamtoos River Valley, Eastern Cape, South Africa. Data was generated through the use of interviews and informal discussions with participants together with document analysis, such as minutes of meetings. I also made observations of the learning interactions that were evident and also the interactions that were evident in the area as a whole. The data was analysed in two phases, the first involved reading across the interview transcripts and organizing the data under broad themes while the second phase made use of an analytical framework, a Community of Practice perspective to further analyze and engage with the data. I drew quite strongly on the ideas of situated learning, Communities of Practice and the notion of Legitimate Peripheral Participation (Lave & Wenger, 1991) as a means to understand, interpret and describe the social learning processes. The research highlighted that in this case study, citrus farmers learn in a number of sociological ways, for example through intergenerational learning (in the family), learning from each other in a Community of Practice, learning from private consultants and extensions officers as well as from other organizations and institutions. It also considered how farmers' learning had influenced land use practice in the area. This brought to the fore an emerging partnership with a conservation agent based on providing economic incentives to farmers to engage in sustainable landuse practices. It is hoped that this research may inform future educational endeavours by shedding light on the social learning processes and by drawing attention to key aspects of learning that may previously have been overlooked in research.
- Full Text:
- Date Issued: 2007
Vice Chancellor's message to the Toronto Old Rhodian Reunion
- Authors: Badat, Saleem
- Date: 2007
- Subjects: Rhodes University
- Language: English
- Type: text
- Identifier: vital:7648 , http://hdl.handle.net/10962/d1015776
- Full Text:
- Date Issued: 2007
- Authors: Badat, Saleem
- Date: 2007
- Subjects: Rhodes University
- Language: English
- Type: text
- Identifier: vital:7648 , http://hdl.handle.net/10962/d1015776
- Full Text:
- Date Issued: 2007
Study of metallophthalocyanines attached onto pre-modified gold surfaces
- Authors: Mashazi, Philani Nkosinathi
- Date: 2007
- Subjects: Phthalocyanines , Electrochemistry , Electrodes, Enzyme , Glucose -- Measurement
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4361 , http://hdl.handle.net/10962/d1005026 , Phthalocyanines , Electrochemistry , Electrodes, Enzyme , Glucose -- Measurement
- Description: Tetra-carboxy acid chloride phthalocyanine complexes of cobalt, iron and manganese were synthesized and characterized using spectroscopic and electrochemical techniques. These complexes were fabricated as thin films on gold electrode following a covalent immobilization and self-assembling methods. Surface electrochemical and spectroscopic characterization showed that these complexes are surface-confined species. The characterization using spectroscopic and electrochemical methods confirmed the formation of thiol and MPc SAMs on gold electrode. The electrocatalytic behaviour of the SAM modified gold electrodes was studied for the detection of L-cysteine and hydrogen peroxide. The limits of detection (LoD) for Lcysteine were of the orders of 10[superscript -7] mol.L[superscript -1] for all the MPc complexes studied and the LoD for hydrogen peroxide at cobalt phthalocyanine modified gold electrode was of the orders of 10[superscript -7]mol.L[superscript -1] for both electrocatalytic oxidation and reduction. The modification process for gold electrodes was reproducible and showed good stability, if stored in pH 4 phosphate buffer solutions and can be used over a long period of time. The cobalt phthalocyanine modified gold electrode was also investigated for the fabrication of glucose oxidase (GOx)-based biosensor and as an electron mediator between the enzyme and gold electrode. The behaviour of the enzyme modified gold electrode towards the detection of glucose was studied and the results gave a limit of detection of the orders of 10[superscript -6] mol.L[superscript -1] with low binding constant (4.8 mM) of enzyme (GOx) to substrate (glucose) referred to as Michaelis-Menten constant. The practical applications, i.e. the real sample analysis and interference studies, for the enzyme modified gold electrodes were investigated. These studies showed that the enzyme electrode is valuable and can be used for glucose detection.
- Full Text:
- Date Issued: 2007
- Authors: Mashazi, Philani Nkosinathi
- Date: 2007
- Subjects: Phthalocyanines , Electrochemistry , Electrodes, Enzyme , Glucose -- Measurement
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4361 , http://hdl.handle.net/10962/d1005026 , Phthalocyanines , Electrochemistry , Electrodes, Enzyme , Glucose -- Measurement
- Description: Tetra-carboxy acid chloride phthalocyanine complexes of cobalt, iron and manganese were synthesized and characterized using spectroscopic and electrochemical techniques. These complexes were fabricated as thin films on gold electrode following a covalent immobilization and self-assembling methods. Surface electrochemical and spectroscopic characterization showed that these complexes are surface-confined species. The characterization using spectroscopic and electrochemical methods confirmed the formation of thiol and MPc SAMs on gold electrode. The electrocatalytic behaviour of the SAM modified gold electrodes was studied for the detection of L-cysteine and hydrogen peroxide. The limits of detection (LoD) for Lcysteine were of the orders of 10[superscript -7] mol.L[superscript -1] for all the MPc complexes studied and the LoD for hydrogen peroxide at cobalt phthalocyanine modified gold electrode was of the orders of 10[superscript -7]mol.L[superscript -1] for both electrocatalytic oxidation and reduction. The modification process for gold electrodes was reproducible and showed good stability, if stored in pH 4 phosphate buffer solutions and can be used over a long period of time. The cobalt phthalocyanine modified gold electrode was also investigated for the fabrication of glucose oxidase (GOx)-based biosensor and as an electron mediator between the enzyme and gold electrode. The behaviour of the enzyme modified gold electrode towards the detection of glucose was studied and the results gave a limit of detection of the orders of 10[superscript -6] mol.L[superscript -1] with low binding constant (4.8 mM) of enzyme (GOx) to substrate (glucose) referred to as Michaelis-Menten constant. The practical applications, i.e. the real sample analysis and interference studies, for the enzyme modified gold electrodes were investigated. These studies showed that the enzyme electrode is valuable and can be used for glucose detection.
- Full Text:
- Date Issued: 2007
Race against democracy: a case study of the Mail & Guardian during the early years of the Mbeki presidency, 1999-2002
- Authors: Steenveld, Lynette Noreen
- Date: 2007
- Subjects: Mbeki, Thabo -- In mass media , Mail & Guardian , South African newspapers , Press -- South Africa , Press and politics -- South Africa , Journalism -- South Africa , Mass media and race relations -- South Africa , Racism in the press -- South Africa , Mass media -- Political aspects -- South Africa , South Africa -- Politics and government -- 20th century
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3537 , http://hdl.handle.net/10962/d1015572
- Description: This thesis examines the 1998 complaint of racism against the Mail & Guardian, a leading exponent of South Africa's alternative press in the 1980s, and important contemporary producer of investigative journalism. The study is framed within a cultural studies approach, analysing the Mail & Guardian as constituted by a 'circuit of production': its social context, production, texts, and audiences. The thesis makes three main arguments. First, that the claim of racism cannot be understood outside of a consideration of both the changing political milieu, and subtle changes within the Mail & Guardian itself. Significant social changes relate to the reconfiguration of racial and class identities wrought by the 'Mbeki state'. Within the Mail & Guardian, the thesis argues for the importance of the power and subjectivity of the editor as a key 'factor' shaping the identity of the paper, evidenced in its production practices and textual outputs. In this regard, the thesis departs from a functionalist analysis of particular 'roles' within the newsroom, drawing instead on a post-structuralist approach to organisational studies. Based on this production and social context, the thesis examines key texts which deal with aspects of South Africa's social transformation, and which exemplify aspects of the Mail & Guardian's reporting which led to the complaint of racism by the Black Lawyers Association (BLA) and the Association of Black Accountants (ABASA). Their complaint was that the Mail & Guardian's reporting impugned the dignity of black people, and in so doing was a violation of their rights to dignity and equality which are constitutionally guaranteed. However, as freedom of the press is also guaranteed by the South African constitution, their complaint to the South African Human Rights Commission (SAHRC) resulted in public debate about these contending rights. My second argument relates to the jurisprudential approach to racism, and the related issue of affirmative action, which informed the complaint against the paper. Contrary to the 'normative', liberal approach to these issues, this thesis highlights Critical Race Theory as the jurisprudential basis for both the claimants' accusation of racism against the Mail & Guardian, and aspects of its implicit use in South African human rights adjudication. The thesis argues that in failing to recognise these different philosophical and political bases of legal reasoning, the media, including the Mail & Guardian, in reporting on these matters failed in their purported role of serving the public interest. The thesis concludes by applying Fraser's critique of Habermas's notion of a single, bourgeois public sphere to journalism, thereby suggesting ways in which the critiques of some of the Mail & Guardian's own journalists could be employed to enlarge its approach to journalism - giving voice to constituencies seldom heard in mainstream media.
- Full Text:
- Date Issued: 2007
- Authors: Steenveld, Lynette Noreen
- Date: 2007
- Subjects: Mbeki, Thabo -- In mass media , Mail & Guardian , South African newspapers , Press -- South Africa , Press and politics -- South Africa , Journalism -- South Africa , Mass media and race relations -- South Africa , Racism in the press -- South Africa , Mass media -- Political aspects -- South Africa , South Africa -- Politics and government -- 20th century
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3537 , http://hdl.handle.net/10962/d1015572
- Description: This thesis examines the 1998 complaint of racism against the Mail & Guardian, a leading exponent of South Africa's alternative press in the 1980s, and important contemporary producer of investigative journalism. The study is framed within a cultural studies approach, analysing the Mail & Guardian as constituted by a 'circuit of production': its social context, production, texts, and audiences. The thesis makes three main arguments. First, that the claim of racism cannot be understood outside of a consideration of both the changing political milieu, and subtle changes within the Mail & Guardian itself. Significant social changes relate to the reconfiguration of racial and class identities wrought by the 'Mbeki state'. Within the Mail & Guardian, the thesis argues for the importance of the power and subjectivity of the editor as a key 'factor' shaping the identity of the paper, evidenced in its production practices and textual outputs. In this regard, the thesis departs from a functionalist analysis of particular 'roles' within the newsroom, drawing instead on a post-structuralist approach to organisational studies. Based on this production and social context, the thesis examines key texts which deal with aspects of South Africa's social transformation, and which exemplify aspects of the Mail & Guardian's reporting which led to the complaint of racism by the Black Lawyers Association (BLA) and the Association of Black Accountants (ABASA). Their complaint was that the Mail & Guardian's reporting impugned the dignity of black people, and in so doing was a violation of their rights to dignity and equality which are constitutionally guaranteed. However, as freedom of the press is also guaranteed by the South African constitution, their complaint to the South African Human Rights Commission (SAHRC) resulted in public debate about these contending rights. My second argument relates to the jurisprudential approach to racism, and the related issue of affirmative action, which informed the complaint against the paper. Contrary to the 'normative', liberal approach to these issues, this thesis highlights Critical Race Theory as the jurisprudential basis for both the claimants' accusation of racism against the Mail & Guardian, and aspects of its implicit use in South African human rights adjudication. The thesis argues that in failing to recognise these different philosophical and political bases of legal reasoning, the media, including the Mail & Guardian, in reporting on these matters failed in their purported role of serving the public interest. The thesis concludes by applying Fraser's critique of Habermas's notion of a single, bourgeois public sphere to journalism, thereby suggesting ways in which the critiques of some of the Mail & Guardian's own journalists could be employed to enlarge its approach to journalism - giving voice to constituencies seldom heard in mainstream media.
- Full Text:
- Date Issued: 2007
The microbial ecology of sulphidogenic lignocellulose degradation
- Authors: Clarke, Anna Maria
- Date: 2007
- Subjects: Microbial ecology , Lignocellulose , Sulfides , Lignin , Lignocellulose -- Biodegradation , Mines and mineral resources -- Waste disposal , Acid mine drainage
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4094 , http://hdl.handle.net/10962/d1008181
- Description: Acid mine drainage is a well known environmental pollutant, not only in South Africa, but throughout the world, and the use of microbial processes in the treatment of these wastes has been the subject of investigation over past decades. Lignocellulose packed-bed reactors have been used in passive treatment systems, and, although effective initially, they show early decline in performance while the packing material remains largely un-utilized. Little is known about this phenomenon which remains a severe constraint in the development of efficient passive mine water treatment systems. It has been proposed that the degradation pathways of the complex lignocellulose substrate may be limited in some way in these systems during the manifestation of this effect. This study has addressed the problem using a molecular microbial ecology methodology in an attempt to relate trophic functions of the microbial population to the physico-chemical data of the system. A field-scale lignocellulose packed-bed reactor located at Vryheid Coronation Colliery (Northern Kwa-Zulu Natal province, South Africa) was monitored for six years and the results showed the classic profile of performance decline related to a slowdown in sulphate reduction and alkalinity production. The reactor was decommissioned , comprehensive samples were collected along the depth profile and the microbial populations investigated by means of 16S rRNA gene methodology. The population was found to include cellulolytic Clostridia spp., CytophagaIFlavobacterlBacteroidetes, Sphingomonadaceae and as yet uncultured microorganisms related to microbiota identified in the rumen and termite gut. These are all known to be involved as primary fermenters of cellulose. Oesulphosporosinus was present as sulphate reducer. A comparison of substrata sampling and population distribution suggested that spatial and temporal gradients within the system may become established over the course of its operation. Based on these findings, a laboratory-scale reactor was constructed to simulate the performance of the packed-bed reactor under controlled experimental conditions. The laboratory-scale reactor was operated for 273 days and showed comparable performance to that in the field in both biomolecular and physicochemical data. Clearly defined trophic niches were observed. These results suggested that a sequence of events does occur in lignocellulose degradation over time. Based on the spatial and temporal column studies, a descriptive model was proposed to account for these events. It was found that fermentative organisms predominate in the inlet zone of the system using easily extractable compounds from the wood, thus providing feedstock for sulphate reduction occurring in the succeeding compartments. Production of sulphide and alkalinity appears to be involved in the enhancement of lignin degradation and this, in turn, appears to enhance access to the cellulose fraction. However, once the readily extractables are exhausted, the decline in sulphide and alkalinity production leads inexorably to a decline in the overall performance of the system as a sulphate reducing unit operation. These observations led to the proposal that with the addition of a limited amount of a readily available carbon source, such as molasses, in the initial zone of the the reactor, the ongoing generation of sulphide would be sustained and this in turn would sustain the microbial attack on the lignocellulose complex. This proposal was tested in scale-up studies and positive results indicate that the descriptive model may, to some extent, provide an account of events occurring in these systems. The work on sustaining lignocellulose degradation through the maintenance of sulphate reduction in the initial stages of the reactor flow path has led to the development of the Degrading Packed-bed Reactor concept and that, has subsequently been successfully evaluated in the field.
- Full Text:
- Date Issued: 2007
- Authors: Clarke, Anna Maria
- Date: 2007
- Subjects: Microbial ecology , Lignocellulose , Sulfides , Lignin , Lignocellulose -- Biodegradation , Mines and mineral resources -- Waste disposal , Acid mine drainage
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4094 , http://hdl.handle.net/10962/d1008181
- Description: Acid mine drainage is a well known environmental pollutant, not only in South Africa, but throughout the world, and the use of microbial processes in the treatment of these wastes has been the subject of investigation over past decades. Lignocellulose packed-bed reactors have been used in passive treatment systems, and, although effective initially, they show early decline in performance while the packing material remains largely un-utilized. Little is known about this phenomenon which remains a severe constraint in the development of efficient passive mine water treatment systems. It has been proposed that the degradation pathways of the complex lignocellulose substrate may be limited in some way in these systems during the manifestation of this effect. This study has addressed the problem using a molecular microbial ecology methodology in an attempt to relate trophic functions of the microbial population to the physico-chemical data of the system. A field-scale lignocellulose packed-bed reactor located at Vryheid Coronation Colliery (Northern Kwa-Zulu Natal province, South Africa) was monitored for six years and the results showed the classic profile of performance decline related to a slowdown in sulphate reduction and alkalinity production. The reactor was decommissioned , comprehensive samples were collected along the depth profile and the microbial populations investigated by means of 16S rRNA gene methodology. The population was found to include cellulolytic Clostridia spp., CytophagaIFlavobacterlBacteroidetes, Sphingomonadaceae and as yet uncultured microorganisms related to microbiota identified in the rumen and termite gut. These are all known to be involved as primary fermenters of cellulose. Oesulphosporosinus was present as sulphate reducer. A comparison of substrata sampling and population distribution suggested that spatial and temporal gradients within the system may become established over the course of its operation. Based on these findings, a laboratory-scale reactor was constructed to simulate the performance of the packed-bed reactor under controlled experimental conditions. The laboratory-scale reactor was operated for 273 days and showed comparable performance to that in the field in both biomolecular and physicochemical data. Clearly defined trophic niches were observed. These results suggested that a sequence of events does occur in lignocellulose degradation over time. Based on the spatial and temporal column studies, a descriptive model was proposed to account for these events. It was found that fermentative organisms predominate in the inlet zone of the system using easily extractable compounds from the wood, thus providing feedstock for sulphate reduction occurring in the succeeding compartments. Production of sulphide and alkalinity appears to be involved in the enhancement of lignin degradation and this, in turn, appears to enhance access to the cellulose fraction. However, once the readily extractables are exhausted, the decline in sulphide and alkalinity production leads inexorably to a decline in the overall performance of the system as a sulphate reducing unit operation. These observations led to the proposal that with the addition of a limited amount of a readily available carbon source, such as molasses, in the initial zone of the the reactor, the ongoing generation of sulphide would be sustained and this in turn would sustain the microbial attack on the lignocellulose complex. This proposal was tested in scale-up studies and positive results indicate that the descriptive model may, to some extent, provide an account of events occurring in these systems. The work on sustaining lignocellulose degradation through the maintenance of sulphate reduction in the initial stages of the reactor flow path has led to the development of the Degrading Packed-bed Reactor concept and that, has subsequently been successfully evaluated in the field.
- Full Text:
- Date Issued: 2007
Phthalocyanines : photochemical, electrochemical and biomimetic catalytic behaviour
- Authors: Sehlotho, Nthapo
- Date: 2007
- Subjects: Phthalocyanines Photochemistry Electrochemistry Biomimetics Oxidation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4336 , http://hdl.handle.net/10962/d1004997
- Description: This thesis explored use of metallophthalocyanines as electrocatalysts towards thiol and thiocyanate oxidation, nitrosothiol decomposition and reduction of oxygen, as well as biomimetic and photo-catalysts of cyclohexene oxidation. 2-mercaptoethanol (2-ME), L-cysteine (CYS) and reduced glutathione (GSH) thiols were oxidized on cobalt tetra ethoxythiophene and cobalt tetra phenoxy pyrrole phthalocyanine modified glassy carbon electrodes, whose catalytic activity was found to depend on pH, film thickness and method of electrode modification. Oxidation of thiocyanate (SCN-), CYS and 2-ME was catalyzed by a selfassembled monolayer of cobalt tetraethoxythiophene Thiocyanate oxidation occurred via two electron transfer, whereas that of CYS and 2-ME required 1 electron. The oxidations of SCN- and 2-ME were catalyzed by ring based processes, while CYS was catalyzed by both Co[superscript III]/Co[superscript II] process and ring-based processes. Oxidation of GSH and 2-ME was conducted on screen printed graphite electrodes modified with cobalt phthalocyanine. Activity depended on method of electrode modification and CoPc % composition. Decomposition of Snitrosoglutathione occurred in the presence of copper ions and NaBH[subscript 4]. Reduced and oxidized glutathione were detected as products using cobalt phthalocyanine adsorbed on an ordinary pyrolytic graphite electrode. Reduction of oxygen was electro-catalyzed by adsorbed manganese phthalocyanine complexes on glassy carbon electrodes. FePc, FePc(Cl)[subscript 16], CoPc and CoPc substituted with phenoxypyrrole and ethoxythiophene ligands were also used as electro-catalysts. Oxygen reduction occurred via two electron transfer in acidic and neutral media forming hydrogen peroxide, while water was formed in basic media via four electron transfer. Cyclohexene oxidation using tert-butylhydroperoxide or chloroperoxy benzoic acid as oxidants in the presence of FePc, FePc(Cl)[subscript 16] and CoPc formed cyclohexene oxide, 2-cyclohexen-1-ol, 2- cyclohexen-1-one and adipic acid. Product selectivity depended on the nature of catalyst and oxidant. The FePc(Cl)[subscript 16] catalyst was transformed into a µ-oxo dimer during the oxidation process while M[superscript III]Pc intermediates were formed with Co[superscript II]Pc and Fe[superscript II]Pc catalysts. Cyclohexene photooxidation catalyzed by zinc phthalocyanine using either red or white light formed 2-cyclohexen-1-one, 2-cyclohexen-1-ol, transcyclohexane diol, cyclohexene oxide and cyclohexene hydroperoxide via singlet oxygen and radical mechanisms. Product yields depended on the light wavelength and intensity, solvent, irradiation time and the rate of photodegradation of the catalyst.
- Full Text:
- Date Issued: 2007
- Authors: Sehlotho, Nthapo
- Date: 2007
- Subjects: Phthalocyanines Photochemistry Electrochemistry Biomimetics Oxidation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4336 , http://hdl.handle.net/10962/d1004997
- Description: This thesis explored use of metallophthalocyanines as electrocatalysts towards thiol and thiocyanate oxidation, nitrosothiol decomposition and reduction of oxygen, as well as biomimetic and photo-catalysts of cyclohexene oxidation. 2-mercaptoethanol (2-ME), L-cysteine (CYS) and reduced glutathione (GSH) thiols were oxidized on cobalt tetra ethoxythiophene and cobalt tetra phenoxy pyrrole phthalocyanine modified glassy carbon electrodes, whose catalytic activity was found to depend on pH, film thickness and method of electrode modification. Oxidation of thiocyanate (SCN-), CYS and 2-ME was catalyzed by a selfassembled monolayer of cobalt tetraethoxythiophene Thiocyanate oxidation occurred via two electron transfer, whereas that of CYS and 2-ME required 1 electron. The oxidations of SCN- and 2-ME were catalyzed by ring based processes, while CYS was catalyzed by both Co[superscript III]/Co[superscript II] process and ring-based processes. Oxidation of GSH and 2-ME was conducted on screen printed graphite electrodes modified with cobalt phthalocyanine. Activity depended on method of electrode modification and CoPc % composition. Decomposition of Snitrosoglutathione occurred in the presence of copper ions and NaBH[subscript 4]. Reduced and oxidized glutathione were detected as products using cobalt phthalocyanine adsorbed on an ordinary pyrolytic graphite electrode. Reduction of oxygen was electro-catalyzed by adsorbed manganese phthalocyanine complexes on glassy carbon electrodes. FePc, FePc(Cl)[subscript 16], CoPc and CoPc substituted with phenoxypyrrole and ethoxythiophene ligands were also used as electro-catalysts. Oxygen reduction occurred via two electron transfer in acidic and neutral media forming hydrogen peroxide, while water was formed in basic media via four electron transfer. Cyclohexene oxidation using tert-butylhydroperoxide or chloroperoxy benzoic acid as oxidants in the presence of FePc, FePc(Cl)[subscript 16] and CoPc formed cyclohexene oxide, 2-cyclohexen-1-ol, 2- cyclohexen-1-one and adipic acid. Product selectivity depended on the nature of catalyst and oxidant. The FePc(Cl)[subscript 16] catalyst was transformed into a µ-oxo dimer during the oxidation process while M[superscript III]Pc intermediates were formed with Co[superscript II]Pc and Fe[superscript II]Pc catalysts. Cyclohexene photooxidation catalyzed by zinc phthalocyanine using either red or white light formed 2-cyclohexen-1-one, 2-cyclohexen-1-ol, transcyclohexane diol, cyclohexene oxide and cyclohexene hydroperoxide via singlet oxygen and radical mechanisms. Product yields depended on the light wavelength and intensity, solvent, irradiation time and the rate of photodegradation of the catalyst.
- Full Text:
- Date Issued: 2007
The development and transfer of core competencies in multinational corporations : a study of three South African originated multinational corporations, compared and contrasted with a leading United States multinational
- Authors: Harvey, Neil M
- Date: 2007
- Subjects: Management -- South Africa International business enterprises -- South Afrca International business enterprises -- United States Core competencies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1197 , http://hdl.handle.net/10962/d1008369
- Description: The thesis studies the development and transfer of core competencies in multinational corporations. It aims to advance the general body of knowledge relating to core competencies, to have practical applicability for management practitioners and academics, to explain how three companies from South Africa became global leaders in their fields and to examine the lessons they learned about international business. Three South African originated multinationals and a US multinational company were studied. The basic methodology is a case study. The methods of research were personal interviews, telephone interviews, written questionnaires, documents, archival records and direct observations. Value chains were used to evaluate the effectiveness of methods of development and transfer and the success of transfer of core competencies. It is concluded that different and multiple methods are needed to develop and transfer core competencies. The effectiveness of methods varies by company and value chain location. There is a significant high degree of correlation between the ratings of success in transferring core competencies and the effectiveness of the methods used to transfer them. This gives substantial credibility to the information provided by the companies and highlights the importance of selecting appropriate methods. There are some variances between the research results and established literature on the development and transfer of core competencies. There are notable differences between the companies from South Africa and the US multinational on the effectiveness of methods used to develop and transfer core competencies. There are also areas where all the companies are in accord. "Roadmaps" covering the effectiveness of methods for developing and transferring core competencies in different locations in a value chain are presented. Practical examples of the companies' actions relating to acquisitions and post-acquisition integration, their experiences in different countries, challenges they face, the methods used to assess transfer, avoid pitfalls and improve transfer, and other issues are also provided.The success of the multinationals from South Africa is explained by a combination of history, competitive factor conditions, management practices, attributes and leadership. The conclusions of the thesis are followed by recommendations on how to improve the management, development and transfer of core competencies.
- Full Text:
- Date Issued: 2007
- Authors: Harvey, Neil M
- Date: 2007
- Subjects: Management -- South Africa International business enterprises -- South Afrca International business enterprises -- United States Core competencies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1197 , http://hdl.handle.net/10962/d1008369
- Description: The thesis studies the development and transfer of core competencies in multinational corporations. It aims to advance the general body of knowledge relating to core competencies, to have practical applicability for management practitioners and academics, to explain how three companies from South Africa became global leaders in their fields and to examine the lessons they learned about international business. Three South African originated multinationals and a US multinational company were studied. The basic methodology is a case study. The methods of research were personal interviews, telephone interviews, written questionnaires, documents, archival records and direct observations. Value chains were used to evaluate the effectiveness of methods of development and transfer and the success of transfer of core competencies. It is concluded that different and multiple methods are needed to develop and transfer core competencies. The effectiveness of methods varies by company and value chain location. There is a significant high degree of correlation between the ratings of success in transferring core competencies and the effectiveness of the methods used to transfer them. This gives substantial credibility to the information provided by the companies and highlights the importance of selecting appropriate methods. There are some variances between the research results and established literature on the development and transfer of core competencies. There are notable differences between the companies from South Africa and the US multinational on the effectiveness of methods used to develop and transfer core competencies. There are also areas where all the companies are in accord. "Roadmaps" covering the effectiveness of methods for developing and transferring core competencies in different locations in a value chain are presented. Practical examples of the companies' actions relating to acquisitions and post-acquisition integration, their experiences in different countries, challenges they face, the methods used to assess transfer, avoid pitfalls and improve transfer, and other issues are also provided.The success of the multinationals from South Africa is explained by a combination of history, competitive factor conditions, management practices, attributes and leadership. The conclusions of the thesis are followed by recommendations on how to improve the management, development and transfer of core competencies.
- Full Text:
- Date Issued: 2007
Grade 5 teachers' understanding and development of concepts in social studies in selected schools in Namibia
- Authors: Sichombe, Beatrice Sinyama
- Date: 2007
- Subjects: Social sciences -- Study and teaching (Elementary) -- Namibia Social science teachers -- Namibia Educational change -- Namibia Education -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1877 , http://hdl.handle.net/10962/d1005856
- Description: After the introduction of Learner Centred Education in Namibia, a number of studies were conducted on how teachers either perceived learner centred education or implemented it. However, very few studies investigated the teachers' understanding of both subject matter knowledge and pedagogical content knowledge; primarily, how they understand and develop key concepts. The purpose of this study was to investigate how Grade 5 teachers' understand and develop key concepts in Social Studies in selected schools in Namibia. The study focused on three teachers in three primary schools in the Caprivi educational region of Namibia. These teachers were purposefully selected as graduates of the teacher education programme instituted at the time of the Namibian education reform process. As a teacher educator, my main motive of conducting this study was to gain a better understanding of some of the issues that have been raised about these graduates' lack of content knowledge. The study adopts a qualitative approach and seeks to investigate (a) how the three teachers in this study understand key concepts and (b) the strategies they use to develop such concepts. Three data collection instruments were employed: interviews, document analysis and class observations. The findings indicate that despite the training that all three teachers in this study received, their understanding of the concepts they taught is problematic. Furthermore, some of the strategies that the teachers used did not bring about learning with understanding. The results of the study revealed how these teachers' problems with concepts and the development of conceptual understanding are related to specific issues and can be attributed to a number of factors. Because of this, the study has provided valuable insights into aspects of teacher education that need to be addressed both in terms of in-service and pre-service programmes to support teachers in teaching for understanding, a key idea underpinning the reform process.
- Full Text:
- Date Issued: 2007
- Authors: Sichombe, Beatrice Sinyama
- Date: 2007
- Subjects: Social sciences -- Study and teaching (Elementary) -- Namibia Social science teachers -- Namibia Educational change -- Namibia Education -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1877 , http://hdl.handle.net/10962/d1005856
- Description: After the introduction of Learner Centred Education in Namibia, a number of studies were conducted on how teachers either perceived learner centred education or implemented it. However, very few studies investigated the teachers' understanding of both subject matter knowledge and pedagogical content knowledge; primarily, how they understand and develop key concepts. The purpose of this study was to investigate how Grade 5 teachers' understand and develop key concepts in Social Studies in selected schools in Namibia. The study focused on three teachers in three primary schools in the Caprivi educational region of Namibia. These teachers were purposefully selected as graduates of the teacher education programme instituted at the time of the Namibian education reform process. As a teacher educator, my main motive of conducting this study was to gain a better understanding of some of the issues that have been raised about these graduates' lack of content knowledge. The study adopts a qualitative approach and seeks to investigate (a) how the three teachers in this study understand key concepts and (b) the strategies they use to develop such concepts. Three data collection instruments were employed: interviews, document analysis and class observations. The findings indicate that despite the training that all three teachers in this study received, their understanding of the concepts they taught is problematic. Furthermore, some of the strategies that the teachers used did not bring about learning with understanding. The results of the study revealed how these teachers' problems with concepts and the development of conceptual understanding are related to specific issues and can be attributed to a number of factors. Because of this, the study has provided valuable insights into aspects of teacher education that need to be addressed both in terms of in-service and pre-service programmes to support teachers in teaching for understanding, a key idea underpinning the reform process.
- Full Text:
- Date Issued: 2007
Conservation incentives for private commercial farmers in the thicket biome, Eastern Cape, South Africa
- Authors: Cumming, Tracey Lyn
- Date: 2007
- Subjects: Landowners -- South Africa -- Eastern Cape , Invasive plants -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4745 , http://hdl.handle.net/10962/d1006953 , Landowners -- South Africa -- Eastern Cape , Invasive plants -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape
- Description: This study sought opportunities to mitigate the pressures of land transformation and alien invader plants on commercial farm land in the thicket biome in the lower reaches of the Fish Kowie Corridor. It had two aims. Firstly, to determine the role incentives could play in mitigating these pressures. Secondly, to determine the characteristics of an incentive programme that would most effectively achieve this. In order to do this, an understanding of landowner activities, needs, opinions and barriers to behaviour; the nature of the pressures on thicket and the nature of the required behaviour to reduce these pressures; and current and past institutional arrangements needed to be achieved. This was done predominantly through a current literature review and personal interviews with landowners and key informants. These findings were used to make recommendations for an effective incentive programme. Landowners showed a preference towards tangible incentives, in particular management assistance, financial compensation and law enforcement. They indicated an aversion to an incentive programme implemented by a government agency, particularly district and provincial government. Rather, landowners showed a propensity towards a nongovernment organisation (NGO) or a farmers group implementing an incentive programme. It was recommended that the two major pressures, namely land transformation and alien invader plants, required different interventions by different agencies in order to be mitigated. The pressure of land transformation required a stewardship model response, with the primary drive being a non-contractual environmental extension service to landowners. The extension service should focus on promoting pro-conservation practises, raising awareness and disseminating information. It should also build a relationship of trust between landowners and the implementing agency. The pressure of alien invader plants would be most effectively addressed through the Working for Water programme. Tangible incentives must be provided to the landowner to induce the costly exercise of alien invader plant control. In particular, the high cost of labour must be addressed. The regulatory incentive of applying laws requiring landowners to control alien invader plants on their land should also be enforced.
- Full Text:
- Date Issued: 2007
- Authors: Cumming, Tracey Lyn
- Date: 2007
- Subjects: Landowners -- South Africa -- Eastern Cape , Invasive plants -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4745 , http://hdl.handle.net/10962/d1006953 , Landowners -- South Africa -- Eastern Cape , Invasive plants -- South Africa -- Eastern Cape , Plant conservation -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape
- Description: This study sought opportunities to mitigate the pressures of land transformation and alien invader plants on commercial farm land in the thicket biome in the lower reaches of the Fish Kowie Corridor. It had two aims. Firstly, to determine the role incentives could play in mitigating these pressures. Secondly, to determine the characteristics of an incentive programme that would most effectively achieve this. In order to do this, an understanding of landowner activities, needs, opinions and barriers to behaviour; the nature of the pressures on thicket and the nature of the required behaviour to reduce these pressures; and current and past institutional arrangements needed to be achieved. This was done predominantly through a current literature review and personal interviews with landowners and key informants. These findings were used to make recommendations for an effective incentive programme. Landowners showed a preference towards tangible incentives, in particular management assistance, financial compensation and law enforcement. They indicated an aversion to an incentive programme implemented by a government agency, particularly district and provincial government. Rather, landowners showed a propensity towards a nongovernment organisation (NGO) or a farmers group implementing an incentive programme. It was recommended that the two major pressures, namely land transformation and alien invader plants, required different interventions by different agencies in order to be mitigated. The pressure of land transformation required a stewardship model response, with the primary drive being a non-contractual environmental extension service to landowners. The extension service should focus on promoting pro-conservation practises, raising awareness and disseminating information. It should also build a relationship of trust between landowners and the implementing agency. The pressure of alien invader plants would be most effectively addressed through the Working for Water programme. Tangible incentives must be provided to the landowner to induce the costly exercise of alien invader plant control. In particular, the high cost of labour must be addressed. The regulatory incentive of applying laws requiring landowners to control alien invader plants on their land should also be enforced.
- Full Text:
- Date Issued: 2007
An analysis of bank risk management and its relevance for the non-bank corporate sector
- Authors: Dietrich, David Roland
- Date: 2007
- Subjects: Bank management , Risk management , Corporations -- Finance , Financial institutions , Banks and banking
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:949 , http://hdl.handle.net/10962/d1002683 , Bank management , Risk management , Corporations -- Finance , Financial institutions , Banks and banking
- Description: This thesis, entitled “An analysis of bank risk management and its relevance for the non-bank corporate sector”, investigates the extent to which financial risk management by the banking sector can be applied to the non-bank corporate sector. As banks’ risk management techniques are more sophisticated than those of the non-bank corporate sector we have endeavoured to ascertain the applicability of these established risk management methods to the non-bank corporate sector. The main objectives of this study were to analyse the banking sectors’ risks and management thereof, and compare them to the risks faced by the nonbank corporate sector. This analysis was then used to present a theoretical financial risk management model for the corporate sector. This analysis was conducted using qualitative research. The thesis engaged in an in-depth investigation of financial risk management through a documentary, literature and media analysis. It was elucidated that not all companies face the same financial risks and therefore each company requires its own unique financial risk management model. Furthermore, it was established that there are several risks that both banks and non-bank corporates are subjected to. However, the management of these risks is not necessarily the same for these two types of institutes. This thesis concludes by putting forward a financial risk management model which presents all the possible financial risks that non-bank corporates may face.
- Full Text:
- Date Issued: 2007
- Authors: Dietrich, David Roland
- Date: 2007
- Subjects: Bank management , Risk management , Corporations -- Finance , Financial institutions , Banks and banking
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:949 , http://hdl.handle.net/10962/d1002683 , Bank management , Risk management , Corporations -- Finance , Financial institutions , Banks and banking
- Description: This thesis, entitled “An analysis of bank risk management and its relevance for the non-bank corporate sector”, investigates the extent to which financial risk management by the banking sector can be applied to the non-bank corporate sector. As banks’ risk management techniques are more sophisticated than those of the non-bank corporate sector we have endeavoured to ascertain the applicability of these established risk management methods to the non-bank corporate sector. The main objectives of this study were to analyse the banking sectors’ risks and management thereof, and compare them to the risks faced by the nonbank corporate sector. This analysis was then used to present a theoretical financial risk management model for the corporate sector. This analysis was conducted using qualitative research. The thesis engaged in an in-depth investigation of financial risk management through a documentary, literature and media analysis. It was elucidated that not all companies face the same financial risks and therefore each company requires its own unique financial risk management model. Furthermore, it was established that there are several risks that both banks and non-bank corporates are subjected to. However, the management of these risks is not necessarily the same for these two types of institutes. This thesis concludes by putting forward a financial risk management model which presents all the possible financial risks that non-bank corporates may face.
- Full Text:
- Date Issued: 2007
Hermeneutic and empirical analyses of graphically inspired metamathematics that reflect critical consciousness within perspectives of personal and social justice
- Authors: Van Jaarsveld, Pieter Paul
- Date: 2007
- Subjects: Mathematics -- Study and teaching -- South Africa Mathematics -- Study and teaching -- Social aspects -- South Africa Algorithms -- Study and teaching -- South Africa Critical pedagogy Metacognition Hermeneutics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1842 , http://hdl.handle.net/10962/d1004376
- Description: My involvement with mathematics education amongst township educators and learners over the past seven years has highlighted the absence of sustained meaning and meaning making of mathematical concepts. It appears though that this instrumental rather than relational understanding of FET mathematics is not unique to township learners but is encountered amongst learners of all socio-economic classes and is representative of many FET mathematics learners. Given that the language of learning and teaching is a major contributory factor in the South African education system, it appears that the language of mathematics itself is a greater exacerbating factor for many learners of mathematics. The exclusive algorithmic approach to classroom mathematics further seems to alienate many learners from the essence of the meaning of mathematical tasks. This research undertakes to determine whether metateaching and metalearning as forerunners to metacognition facilitates the acquisition of the sustained meaning of mathematical concepts. Metateaching and metalearning refer to the acute and deliberate awareness by educator and learner as to what constitutes concepts. Teaching and learning therefore presupposes the deconstruction of concepts into its subsumed derivative roots. It also assumes an awareness of the tacit degrees of abstraction that characterise tasks and the content of tasks. This in turn has implications for the educator's adopted sequence of topics for instruction. Metacognition implies awareness on the part of the learner (and educator) as to how material is learned and a further awareness as to how that learning can be sustained. Whether we ascribe meaningful learning to radical or social constructivism, or to associationist didactive approaches, or a combination of these, we are making assumptions about how learners acquire and sustain mathematical meaning because mathematics is, by and large a symbolic language often devoid of affective connotation. Furthermore our assessments of learners' tasks amount to clinical corrections of austere formulae wrapped in algorithmic procedures which manifest nothing of a learner's experience of mathematics or the deeper understanding (or misunderstandings) which characterise a learning and/or assessment episode. To this end the research design of this interpretive case study requires learners to expound in textual accounts their thoughts as they describe the evolution of a mathematical process as they approach a solution and eventually interpret it. The textual account exposes the concept definition for what it really is in a learner's understanding of it and it is the expressiveness of language that indicates whether the understanding of a learner is approaching the concept image. The textual accounts vary in richness in terms of mathematical register and this in turn reflects the conceptual depth. The mechanism which seems to promote the conversion from concept definition to concept image is the graphical representation of the mathematical task or procedure, possibly because of its greater concreteness as opposed to the abstraction of its algebraic form.
- Full Text:
- Date Issued: 2007
- Authors: Van Jaarsveld, Pieter Paul
- Date: 2007
- Subjects: Mathematics -- Study and teaching -- South Africa Mathematics -- Study and teaching -- Social aspects -- South Africa Algorithms -- Study and teaching -- South Africa Critical pedagogy Metacognition Hermeneutics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1842 , http://hdl.handle.net/10962/d1004376
- Description: My involvement with mathematics education amongst township educators and learners over the past seven years has highlighted the absence of sustained meaning and meaning making of mathematical concepts. It appears though that this instrumental rather than relational understanding of FET mathematics is not unique to township learners but is encountered amongst learners of all socio-economic classes and is representative of many FET mathematics learners. Given that the language of learning and teaching is a major contributory factor in the South African education system, it appears that the language of mathematics itself is a greater exacerbating factor for many learners of mathematics. The exclusive algorithmic approach to classroom mathematics further seems to alienate many learners from the essence of the meaning of mathematical tasks. This research undertakes to determine whether metateaching and metalearning as forerunners to metacognition facilitates the acquisition of the sustained meaning of mathematical concepts. Metateaching and metalearning refer to the acute and deliberate awareness by educator and learner as to what constitutes concepts. Teaching and learning therefore presupposes the deconstruction of concepts into its subsumed derivative roots. It also assumes an awareness of the tacit degrees of abstraction that characterise tasks and the content of tasks. This in turn has implications for the educator's adopted sequence of topics for instruction. Metacognition implies awareness on the part of the learner (and educator) as to how material is learned and a further awareness as to how that learning can be sustained. Whether we ascribe meaningful learning to radical or social constructivism, or to associationist didactive approaches, or a combination of these, we are making assumptions about how learners acquire and sustain mathematical meaning because mathematics is, by and large a symbolic language often devoid of affective connotation. Furthermore our assessments of learners' tasks amount to clinical corrections of austere formulae wrapped in algorithmic procedures which manifest nothing of a learner's experience of mathematics or the deeper understanding (or misunderstandings) which characterise a learning and/or assessment episode. To this end the research design of this interpretive case study requires learners to expound in textual accounts their thoughts as they describe the evolution of a mathematical process as they approach a solution and eventually interpret it. The textual account exposes the concept definition for what it really is in a learner's understanding of it and it is the expressiveness of language that indicates whether the understanding of a learner is approaching the concept image. The textual accounts vary in richness in terms of mathematical register and this in turn reflects the conceptual depth. The mechanism which seems to promote the conversion from concept definition to concept image is the graphical representation of the mathematical task or procedure, possibly because of its greater concreteness as opposed to the abstraction of its algebraic form.
- Full Text:
- Date Issued: 2007
Synthesis of novel coumarin derivatives as potential inhibitors of HIV-1 protease
- Authors: Rose, Nathan Rolf
- Date: 2007 , 2013-07-01
- Subjects: Coumarins , Protease Inhibitors , Heterocyclic compounds -- Derivatives , HIV infections -- Treatment
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4430 , http://hdl.handle.net/10962/d1007220 , Coumarins , Protease Inhibitors , Heterocyclic compounds -- Derivatives , HIV infections -- Treatment
- Description: This research has focused on the development of novel coumann derivatives containing peptide-like side chains as potential HIV-1 protease inhibitors. The reaction of various salicylaldehyde derivatives with tert-butyl acrylate In the presence of 1,4- diazabicyclo[2.2.2]octane (DABCO) has afforded a series of Baylis-Hillman adducts in moderate yield. Cyclisation of the adducts in the presence of HCI afforded the corresponding 3-(chloromethyl)coumarin derivatives, which have been reacted with various amine hydrochlorides in the presence of Proton Sponge® to afford a series of novel 3- (aminomethyl)coumarin derivatives, which were fully characterised by NMR and HRMS methods. Various approaches to the introduction of hydroxyl or amino groups at the C-4 position of coumarin and the 3-(chloromethyl)coumarin derivatives have been explored; these have included dihydroxylation of the coumarin double bond, and the synthesis of 4- benzylaminocoumarin derivatives as potential intermediates. The Vilsmeier-Haack and Mannich reactions have also been investigated as possible methods of introducing the desired peptide-like functionality. Computer modelling of selected structures has indicated that some of the novel 3- (aminomethyl)coumarin derivatives may exhibit activity as inhibitors of HIV-1 protease. The planned enzyme inhibition assays were unfortunately precluded by the aqueous insolubility of the selected compounds. Three ¹³C NMR chemical shift algorithms, viz., Modgraph Neural Network, Modgraph HOSE and Chern Window, have been applied to selected compounds prepared in this study. The Modgraph Neural Network algorithm was found, in all cases, to provide the most accurate correlations with the experimentally-determined chemical shifts. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2007
- Authors: Rose, Nathan Rolf
- Date: 2007 , 2013-07-01
- Subjects: Coumarins , Protease Inhibitors , Heterocyclic compounds -- Derivatives , HIV infections -- Treatment
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4430 , http://hdl.handle.net/10962/d1007220 , Coumarins , Protease Inhibitors , Heterocyclic compounds -- Derivatives , HIV infections -- Treatment
- Description: This research has focused on the development of novel coumann derivatives containing peptide-like side chains as potential HIV-1 protease inhibitors. The reaction of various salicylaldehyde derivatives with tert-butyl acrylate In the presence of 1,4- diazabicyclo[2.2.2]octane (DABCO) has afforded a series of Baylis-Hillman adducts in moderate yield. Cyclisation of the adducts in the presence of HCI afforded the corresponding 3-(chloromethyl)coumarin derivatives, which have been reacted with various amine hydrochlorides in the presence of Proton Sponge® to afford a series of novel 3- (aminomethyl)coumarin derivatives, which were fully characterised by NMR and HRMS methods. Various approaches to the introduction of hydroxyl or amino groups at the C-4 position of coumarin and the 3-(chloromethyl)coumarin derivatives have been explored; these have included dihydroxylation of the coumarin double bond, and the synthesis of 4- benzylaminocoumarin derivatives as potential intermediates. The Vilsmeier-Haack and Mannich reactions have also been investigated as possible methods of introducing the desired peptide-like functionality. Computer modelling of selected structures has indicated that some of the novel 3- (aminomethyl)coumarin derivatives may exhibit activity as inhibitors of HIV-1 protease. The planned enzyme inhibition assays were unfortunately precluded by the aqueous insolubility of the selected compounds. Three ¹³C NMR chemical shift algorithms, viz., Modgraph Neural Network, Modgraph HOSE and Chern Window, have been applied to selected compounds prepared in this study. The Modgraph Neural Network algorithm was found, in all cases, to provide the most accurate correlations with the experimentally-determined chemical shifts. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2007
Securing softswitches from malicious attacks
- Authors: Opie, Jake Weyman
- Date: 2007
- Subjects: Internet telephony -- Security measures , Computer networks -- Security measures , Digital telephone systems , Communication -- Technological innovations , Computer network protocols , TCP/IP (Computer network protocol) , Switching theory
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4683 , http://hdl.handle.net/10962/d1007714 , Internet telephony -- Security measures , Computer networks -- Security measures , Digital telephone systems , Communication -- Technological innovations , Computer network protocols , TCP/IP (Computer network protocol) , Switching theory
- Description: Traditionally, real-time communication, such as voice calls, has run on separate, closed networks. Of all the limitations that these networks had, the ability of malicious attacks to cripple communication was not a crucial one. This situation has changed radically now that real-time communication and data have merged to share the same network. The objective of this project is to investigate the securing of softswitches with functionality similar to Private Branch Exchanges (PBX) from malicious attacks. The focus of the project will be a practical investigation of how to secure ILANGA, an ASTERISK-based system under development at Rhodes University. The practical investigation that focuses on ILANGA is based on performing six varied experiments on the different components of ILANGA. Before the six experiments are performed, basic preliminary security measures and the restrictions placed on the access to the database are discussed. The outcomes of these experiments are discussed and the precise reasons why these attacks were either successful or unsuccessful are given. Suggestions of a theoretical nature on how to defend against the successful attacks are also presented.
- Full Text:
- Date Issued: 2007
- Authors: Opie, Jake Weyman
- Date: 2007
- Subjects: Internet telephony -- Security measures , Computer networks -- Security measures , Digital telephone systems , Communication -- Technological innovations , Computer network protocols , TCP/IP (Computer network protocol) , Switching theory
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4683 , http://hdl.handle.net/10962/d1007714 , Internet telephony -- Security measures , Computer networks -- Security measures , Digital telephone systems , Communication -- Technological innovations , Computer network protocols , TCP/IP (Computer network protocol) , Switching theory
- Description: Traditionally, real-time communication, such as voice calls, has run on separate, closed networks. Of all the limitations that these networks had, the ability of malicious attacks to cripple communication was not a crucial one. This situation has changed radically now that real-time communication and data have merged to share the same network. The objective of this project is to investigate the securing of softswitches with functionality similar to Private Branch Exchanges (PBX) from malicious attacks. The focus of the project will be a practical investigation of how to secure ILANGA, an ASTERISK-based system under development at Rhodes University. The practical investigation that focuses on ILANGA is based on performing six varied experiments on the different components of ILANGA. Before the six experiments are performed, basic preliminary security measures and the restrictions placed on the access to the database are discussed. The outcomes of these experiments are discussed and the precise reasons why these attacks were either successful or unsuccessful are given. Suggestions of a theoretical nature on how to defend against the successful attacks are also presented.
- Full Text:
- Date Issued: 2007