Investigation of the effects of 2000 & 2007 flooding on food security in two East African countries
- Authors: Albertsen, Jo-Anne Rose
- Date: 2009
- Subjects: Food security -- Environmental aspects -- Africa, Eastern , Floods -- Africa, Eastern , Agriculture -- Economic aspects -- Africa, Eastern
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9035 , http://hdl.handle.net/10948/916 , Food security -- Environmental aspects -- Africa, Eastern , Floods -- Africa, Eastern , Agriculture -- Economic aspects -- Africa, Eastern
- Description: Flooding has been identified as the predominant, environmental generator of food emergencies. Climate change and climate variability have been blamed for these extreme weather events, which are envisioned to affect the future food security and nutritional status of populations across the African continent. It is thus expected that these weather phenomena will continue to increase in frequency and intensity as climate change progresses. Already, climate change has had a dramatic effect on the natural world with increased desertification, warming oceans, rising temperatures and changing weather patterns. In turn, this has affected agriculture and fishing, which subsequently determines the availability of food. On the contrary, weather alone, is not the sole contributing factor to problems that are associated with food security/insecurity. Elements embedded within a political, social, economical, and/or other, context also serve to contribute to how a population or individual experiences food security. It is therefore imperative that these aspects from the social or developmental arena are considered in conjunction with aspects from the natural or environmental sciences. Such a holistic approach to subjects relating to climate change and development will eventually lead to the realisation of sustainable development, which in turn serves to protect human security in the long-term. The research was primarily directed at examining how flooding affects food security and what can be done to avoid, or cope with, a potential food crisis. The above-mentioned social and developmental features shaped the scope of this research, giving rise to an investigation which transcended the confines of flooding as an independent cause and consequence of food insecurity. With East Africa as a focal point, Mozambique and Zambia emerged as the most affected countries with millions of people affected by these devastating waters in 2000 and 2007, respectively. Due to the past nature of the events, it was most appropriate to utilise statistics from sources such as existing databases, reports and articles. Some of the topics that were included in the investigation examined the causes and consequences of the flooding and the management of these disasters. These topics were scrutinised using both qualitative and quantitative dimensions of research, so that an interesting and viable study could be undertaken. ii The research found that frequent and severe flood disasters increase a population‟s vulnerability to food insecurity, as a wide variety of assets, structures and infrastructures are destroyed. However, with careful management, planning and adaptation, many of these unwanted consequences can be avoided or swiftly overcome. Both Mozambique and Zambia were found to be countries that were determined to overcome the barriers associated with climate change and its subsequent extreme weather events. This positively indicated that they were committed to the development process and the wellbeing of their populations. Apart from introducing the topic surrounding the influence of flooding on food security in East Africa, one of the main goals of this research was to gather recommendations and suggestions for avoiding or managing issues that could hamper food security. This ultimately forms an important source of reference for governmental and non-governmental institutions dealing with flooding and food security. Even though Mozambique and Zambia were chosen as the cases for investigation, many of the recommendations can be adapted and applied to countries world-wide.
- Full Text:
- Date Issued: 2009
- Authors: Albertsen, Jo-Anne Rose
- Date: 2009
- Subjects: Food security -- Environmental aspects -- Africa, Eastern , Floods -- Africa, Eastern , Agriculture -- Economic aspects -- Africa, Eastern
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9035 , http://hdl.handle.net/10948/916 , Food security -- Environmental aspects -- Africa, Eastern , Floods -- Africa, Eastern , Agriculture -- Economic aspects -- Africa, Eastern
- Description: Flooding has been identified as the predominant, environmental generator of food emergencies. Climate change and climate variability have been blamed for these extreme weather events, which are envisioned to affect the future food security and nutritional status of populations across the African continent. It is thus expected that these weather phenomena will continue to increase in frequency and intensity as climate change progresses. Already, climate change has had a dramatic effect on the natural world with increased desertification, warming oceans, rising temperatures and changing weather patterns. In turn, this has affected agriculture and fishing, which subsequently determines the availability of food. On the contrary, weather alone, is not the sole contributing factor to problems that are associated with food security/insecurity. Elements embedded within a political, social, economical, and/or other, context also serve to contribute to how a population or individual experiences food security. It is therefore imperative that these aspects from the social or developmental arena are considered in conjunction with aspects from the natural or environmental sciences. Such a holistic approach to subjects relating to climate change and development will eventually lead to the realisation of sustainable development, which in turn serves to protect human security in the long-term. The research was primarily directed at examining how flooding affects food security and what can be done to avoid, or cope with, a potential food crisis. The above-mentioned social and developmental features shaped the scope of this research, giving rise to an investigation which transcended the confines of flooding as an independent cause and consequence of food insecurity. With East Africa as a focal point, Mozambique and Zambia emerged as the most affected countries with millions of people affected by these devastating waters in 2000 and 2007, respectively. Due to the past nature of the events, it was most appropriate to utilise statistics from sources such as existing databases, reports and articles. Some of the topics that were included in the investigation examined the causes and consequences of the flooding and the management of these disasters. These topics were scrutinised using both qualitative and quantitative dimensions of research, so that an interesting and viable study could be undertaken. ii The research found that frequent and severe flood disasters increase a population‟s vulnerability to food insecurity, as a wide variety of assets, structures and infrastructures are destroyed. However, with careful management, planning and adaptation, many of these unwanted consequences can be avoided or swiftly overcome. Both Mozambique and Zambia were found to be countries that were determined to overcome the barriers associated with climate change and its subsequent extreme weather events. This positively indicated that they were committed to the development process and the wellbeing of their populations. Apart from introducing the topic surrounding the influence of flooding on food security in East Africa, one of the main goals of this research was to gather recommendations and suggestions for avoiding or managing issues that could hamper food security. This ultimately forms an important source of reference for governmental and non-governmental institutions dealing with flooding and food security. Even though Mozambique and Zambia were chosen as the cases for investigation, many of the recommendations can be adapted and applied to countries world-wide.
- Full Text:
- Date Issued: 2009
Investigation of the microstructure of nuclear grade matrix graphite
- Authors: Downey, Justin Michael
- Date: 2009
- Subjects: Graphite -- South Africa , Microstructure , Nanostructured materials -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10540 , http://hdl.handle.net/10948/944 , Graphite -- South Africa , Microstructure , Nanostructured materials -- South Africa
- Description: This dissertation focuses on the investigation of the microstructures of two nuclear grade matrix graphites. These graphites were intended for use in the core components of a high temperature test reactor (HTTR) of the pebble bed modular reactor (PBMR) design. The graphites were provided in the form of fuel spheres and a reflector block. The techniques used in the analysis of the materials include fracturing, etching, scanning electron microscopy (SEM), nano-indentation, x-ray diffraction (XRD) and transmission electron microscopy (TEM). The microstructures of the materials were characterized successfully. The fuel sphere material consisted of a high concentration of curved graphite flakes and grains in contact with turbostratic matrix graphite. The well graphitized flakes and grains were polycrystalline in nature. Delamination cracks were prevalent in the graphite crystallites. There was no significant difference in the microstructures of the center, interior and surface regions of the fuel sphere material. No evidence of amorphous carbon or resin residues was found. The reflector material consisted of a low concentration of graphite crystallites embedded within turbostratic matrix graphite. Delamination cracks were observed within the graphite crystallites, and many cavities were present in the material. TEM observation also revealed the presence of diamond crystallites. It was concluded that the fuel sphere graphite was most probably suitable for use as is, provided that the material also possessed other required properties for use in a HTTR. The reflector material however was considered to be unsuitable for use in a HTTR. It was thus suggested that the reflector material could be made more suitable by sufficient graphitization of the turbostratic graphite which formed the bulk of the material.
- Full Text:
- Date Issued: 2009
- Authors: Downey, Justin Michael
- Date: 2009
- Subjects: Graphite -- South Africa , Microstructure , Nanostructured materials -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10540 , http://hdl.handle.net/10948/944 , Graphite -- South Africa , Microstructure , Nanostructured materials -- South Africa
- Description: This dissertation focuses on the investigation of the microstructures of two nuclear grade matrix graphites. These graphites were intended for use in the core components of a high temperature test reactor (HTTR) of the pebble bed modular reactor (PBMR) design. The graphites were provided in the form of fuel spheres and a reflector block. The techniques used in the analysis of the materials include fracturing, etching, scanning electron microscopy (SEM), nano-indentation, x-ray diffraction (XRD) and transmission electron microscopy (TEM). The microstructures of the materials were characterized successfully. The fuel sphere material consisted of a high concentration of curved graphite flakes and grains in contact with turbostratic matrix graphite. The well graphitized flakes and grains were polycrystalline in nature. Delamination cracks were prevalent in the graphite crystallites. There was no significant difference in the microstructures of the center, interior and surface regions of the fuel sphere material. No evidence of amorphous carbon or resin residues was found. The reflector material consisted of a low concentration of graphite crystallites embedded within turbostratic matrix graphite. Delamination cracks were observed within the graphite crystallites, and many cavities were present in the material. TEM observation also revealed the presence of diamond crystallites. It was concluded that the fuel sphere graphite was most probably suitable for use as is, provided that the material also possessed other required properties for use in a HTTR. The reflector material however was considered to be unsuitable for use in a HTTR. It was thus suggested that the reflector material could be made more suitable by sufficient graphitization of the turbostratic graphite which formed the bulk of the material.
- Full Text:
- Date Issued: 2009
Jeffrey Lionel Dahmer : a psychobiographical study
- Authors: Chéze, Eldon
- Date: 2009
- Subjects: Dahmer, Jeffrey , Personality development -- South Africa , Murderers -- South Africa -- Psychology , Adlerian psychology -- South Africa , Serial murder investigation -- South Africa -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9884 , http://hdl.handle.net/10948/1221 , Dahmer, Jeffrey , Personality development -- South Africa , Murderers -- South Africa -- Psychology , Adlerian psychology -- South Africa , Serial murder investigation -- South Africa -- Psychological aspects
- Description: Serial crime is an element of society that continues to disturb and fascinate scholars. There is thus a need to understand the uniqueness of serial murderers and their psychological development. The field of psychobiography is a qualitative approach to uncover the story of an individual life through greater understanding of psychological concepts. Psychobiographical research is invaluable in the application of theory to the finished lives of exemplary or enigmatic individuals to develop and test theories of human development. Jeffrey Lionel Dahmer (1960 – 1994), a cannibalistic serial killer who killed 17 young men, served as the single psychobiographical subject in this study. Dahmer was selected based on interest value, his uniqueness and the lack of a specifically academic and psychologically focused case study on his life. A qualitative psychobiographical research method was utilized in this study. The primary aim of the research was to explore and describe Jeffrey Dahmer’s personality development across his lifespan. This was achieved by applying Erikson’s (1950) psychosocial theory of staged developmental crises to the lifespan developmental process and Adler’s (1929) dynamic individual psychology to provide a more comprehensive idiographic interpretation of Dahmer as an individual. Jeffrey Dahmer’s life history was uncovered in this psychobiographical case study research through the systematic and consistent collection, analysis and interpretation of life history materials, which highlighted five significant historical periods: (a) Childhood of Fantasy, (b) The Quiet Loner, (c) Hiatus – or Build-up, (d) Seeking a Compliant Partner and (e) Arrest, Trial and Death. The two theoretical frameworks were used to discern, transform and reconstruct his life into a coherent and illuminating narrative of his psychological movement through life. Alexander’s (1988) model of identifying salient themes was used to analyze data for analytical generalization (Yin, 1994). A conceptual framework derived from the two theoretical perspectives was constructed to organize and integrate data and to guide the presentation and discussion of the findings of the study in an integrative and comprehensive manner. The findings suggested that both theoretical perspectives considered the biopsychosocial as well as cultural and historical influences of situations and experiences in Dahmer’s personality development throughout the lifespan. Adlerian theory indicated that Dahmer held a socially useless lifestyle whose movement was guided purposively towards a fictional goal xxii of godlikeness through creative, concrete expressions of personal superiority. Eriksonian theory held that Dahmer remained in role confusion, which was viewed as a functional, fragmented identity to survive in society and achieve a fantasy. Thus, both theories indicated, despite their different conceptualizations, that Dahmer’s personality development was ultimately not socially beneficial. The study of Dahmer’s personality development has provided a positive demonstration of the value of both Erikson (1950) and Adler’s (1929) theories to understand the processes of personality development in an individual life. It has further highlighted the uniqueness of individual responses to life tasks and consequently unlocked the possibility of perceiving people and their actions differently. Recommendations were made for future research undertakings that utilize a psychobiographical research design and methodology to uncover, illuminate and reconstruct the lives of enigmatic personalities.
- Full Text:
- Date Issued: 2009
- Authors: Chéze, Eldon
- Date: 2009
- Subjects: Dahmer, Jeffrey , Personality development -- South Africa , Murderers -- South Africa -- Psychology , Adlerian psychology -- South Africa , Serial murder investigation -- South Africa -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9884 , http://hdl.handle.net/10948/1221 , Dahmer, Jeffrey , Personality development -- South Africa , Murderers -- South Africa -- Psychology , Adlerian psychology -- South Africa , Serial murder investigation -- South Africa -- Psychological aspects
- Description: Serial crime is an element of society that continues to disturb and fascinate scholars. There is thus a need to understand the uniqueness of serial murderers and their psychological development. The field of psychobiography is a qualitative approach to uncover the story of an individual life through greater understanding of psychological concepts. Psychobiographical research is invaluable in the application of theory to the finished lives of exemplary or enigmatic individuals to develop and test theories of human development. Jeffrey Lionel Dahmer (1960 – 1994), a cannibalistic serial killer who killed 17 young men, served as the single psychobiographical subject in this study. Dahmer was selected based on interest value, his uniqueness and the lack of a specifically academic and psychologically focused case study on his life. A qualitative psychobiographical research method was utilized in this study. The primary aim of the research was to explore and describe Jeffrey Dahmer’s personality development across his lifespan. This was achieved by applying Erikson’s (1950) psychosocial theory of staged developmental crises to the lifespan developmental process and Adler’s (1929) dynamic individual psychology to provide a more comprehensive idiographic interpretation of Dahmer as an individual. Jeffrey Dahmer’s life history was uncovered in this psychobiographical case study research through the systematic and consistent collection, analysis and interpretation of life history materials, which highlighted five significant historical periods: (a) Childhood of Fantasy, (b) The Quiet Loner, (c) Hiatus – or Build-up, (d) Seeking a Compliant Partner and (e) Arrest, Trial and Death. The two theoretical frameworks were used to discern, transform and reconstruct his life into a coherent and illuminating narrative of his psychological movement through life. Alexander’s (1988) model of identifying salient themes was used to analyze data for analytical generalization (Yin, 1994). A conceptual framework derived from the two theoretical perspectives was constructed to organize and integrate data and to guide the presentation and discussion of the findings of the study in an integrative and comprehensive manner. The findings suggested that both theoretical perspectives considered the biopsychosocial as well as cultural and historical influences of situations and experiences in Dahmer’s personality development throughout the lifespan. Adlerian theory indicated that Dahmer held a socially useless lifestyle whose movement was guided purposively towards a fictional goal xxii of godlikeness through creative, concrete expressions of personal superiority. Eriksonian theory held that Dahmer remained in role confusion, which was viewed as a functional, fragmented identity to survive in society and achieve a fantasy. Thus, both theories indicated, despite their different conceptualizations, that Dahmer’s personality development was ultimately not socially beneficial. The study of Dahmer’s personality development has provided a positive demonstration of the value of both Erikson (1950) and Adler’s (1929) theories to understand the processes of personality development in an individual life. It has further highlighted the uniqueness of individual responses to life tasks and consequently unlocked the possibility of perceiving people and their actions differently. Recommendations were made for future research undertakings that utilize a psychobiographical research design and methodology to uncover, illuminate and reconstruct the lives of enigmatic personalities.
- Full Text:
- Date Issued: 2009
Job satisfaction of public sector pharmacists in the Nelson Mandela Metropole
- Authors: Matshotyana, Kidwell
- Date: 2009
- Subjects: Job satisfaction , Employee retention , Pharmacists -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10143 , http://hdl.handle.net/10948/1006 , Job satisfaction , Employee retention , Pharmacists -- South Africa -- Port Elizabeth
- Description: There is a severe shortage of pharmacists in the Nelson Mandela Metropole with a current vacancy rate of over 50 percent on the approved posts for pharmacists (PERSAL 31 December 2007). The metropole has struggled to retain pharmacists in spite of the urban setting. The aim of this research was to measure the level of job satisfaction amongst pharmacists working in the public sector of the Nelson Mandela Metropole. The research objective was to conduct a questionnaire-based survey of pharmacists working in public sector facilities in the Nelson Mandela Metropole in order to assess their levels of job satisfaction, and report the findings with appropriate recommendations to management. For this study, the modified JDI Index survey was used focusing on the subscales; work, pay, promotion, supervision, co-workers and patient interaction. Possible retention strategies were also investigated through the use of open ended questions. The questionnaire was administered to 30 pharmacists in full time employment within the public sector in the Nelson Mandela Metropole. A total of 25 questionnaires were returned giving an 83.3 percent response rate. The pharmacists were generally satisfied with the job, their pharmacy co-workers, patient interaction and supervision but were not satisfied with salary and promotion opportunities in the public sector. Using a score from 1 to 5, with 5 indicating a level of high satisfaction, the mean scores for the six subscales were, job (3.2), income (2.1), patient interaction (3.3), promotion (2.0), co-workers (3.4) and supervision (3.7). Financial packages (23, n=25) and fringe benefits (22, n=25) were indicated as the most effective strategies in attracting and retaining pharmacists into the public service. The majority of respondents (15, n=25) agreed that the favourable working hours, flexibility of work, regular working hours with no weekend duties were the most vii positive aspects about their job. The negative aspects mentioned by the majority of the respondents (15, n=25) included poor remuneration, unrealistic notch increases and salaries that were not market-related and uncompetitive.
- Full Text:
- Date Issued: 2009
- Authors: Matshotyana, Kidwell
- Date: 2009
- Subjects: Job satisfaction , Employee retention , Pharmacists -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10143 , http://hdl.handle.net/10948/1006 , Job satisfaction , Employee retention , Pharmacists -- South Africa -- Port Elizabeth
- Description: There is a severe shortage of pharmacists in the Nelson Mandela Metropole with a current vacancy rate of over 50 percent on the approved posts for pharmacists (PERSAL 31 December 2007). The metropole has struggled to retain pharmacists in spite of the urban setting. The aim of this research was to measure the level of job satisfaction amongst pharmacists working in the public sector of the Nelson Mandela Metropole. The research objective was to conduct a questionnaire-based survey of pharmacists working in public sector facilities in the Nelson Mandela Metropole in order to assess their levels of job satisfaction, and report the findings with appropriate recommendations to management. For this study, the modified JDI Index survey was used focusing on the subscales; work, pay, promotion, supervision, co-workers and patient interaction. Possible retention strategies were also investigated through the use of open ended questions. The questionnaire was administered to 30 pharmacists in full time employment within the public sector in the Nelson Mandela Metropole. A total of 25 questionnaires were returned giving an 83.3 percent response rate. The pharmacists were generally satisfied with the job, their pharmacy co-workers, patient interaction and supervision but were not satisfied with salary and promotion opportunities in the public sector. Using a score from 1 to 5, with 5 indicating a level of high satisfaction, the mean scores for the six subscales were, job (3.2), income (2.1), patient interaction (3.3), promotion (2.0), co-workers (3.4) and supervision (3.7). Financial packages (23, n=25) and fringe benefits (22, n=25) were indicated as the most effective strategies in attracting and retaining pharmacists into the public service. The majority of respondents (15, n=25) agreed that the favourable working hours, flexibility of work, regular working hours with no weekend duties were the most vii positive aspects about their job. The negative aspects mentioned by the majority of the respondents (15, n=25) included poor remuneration, unrealistic notch increases and salaries that were not market-related and uncompetitive.
- Full Text:
- Date Issued: 2009
Key factors required to be classified as a world-class supplier from a South African automotive industry perspective
- Authors: Cook, Gavin Trevor
- Date: 2009
- Subjects: Automobile industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9335 , http://hdl.handle.net/10948/935 , Automobile industry and trade -- South Africa
- Description: Over and above the fact that South African automotive business firms do not have the advantages of a major domestic market and are far removed from the major world markets, they face the challenges of operating in a tough and ever-changing environment. This environment is characterised by a global recession, aggressive global competition, high inflation and more demanding customers. To overcome these obstacles and to ensure their continuous success and existence, these domestic firms need to create a competitive advantage. The establishment of such a competitive advantage is dependent on a number of factors which mainly include sourcing from a world-class supplier base in terms of price, quality and service delivery. The main objective and central theme of this study is to determine the factors that are required by a supplier in the South African automotive industry to be classified as a world-class supplier. In support of the main objective, it was necessary to source the reasons why a firm would find it important to trade with a world-class supplier base, and to determine whether the current levels of supplier performance as experienced by buying firms in the Eastern Cape automotive industry, could be regarded as world-class. Furthermore, the study set out to determine the consequences to customer firms of inferior supplier performance, as well as the actions currently taken and support programmes in place to bring suppliers in line with world-class standards. As a starting point to the study, a literature review was undertaken which revealed the definite interdependence between a business firm and the environment in which it operates. The review underlined the need for environmental scanning as a means to proactively manage the impact of environmental changes on a firm. Porter’s value chain and business process re-engineering, as discussed in the study, are also perceived as means to manage environmental changes. The literature study further revealed some of the latest business trends followed by automotive business firms, as well as the expected supplier buy-in to ensure success. A statistical analysis on the quantitative data gathered, grouped specific items (questions) that relate to the study’s main objective with three respective individual supplier performance areas. A confirmatory factor analysis which focused on the three factors, namely quality, pricing and service delivery was carried out to assess the validity of the questions used for gathering the research data. The Cronbach Alphas determined for the three factors portrayed the reliability of the research instrument as acceptable. The empirical study revealed a few main factors that automotive business firms strongly perceive as being key to the establishment of a world-class supplier base. These factors are: a culture of continuous improvement; consistently meeting delivery deadlines by being able to respond to customer schedule changes; quoting fair prices and having respect for business ethics; as well as the consistent application of a quality policy which leads to conformance to specifications and subsequent high levels of product reliability. The empirical study also identified the following benefits enjoyed by customer business firms when trading with a world-class supplier base: Firms are able to be more flexible to customer schedule changes; they receive products that meet specifications; and they are able to operate at lower costs. The empirical findings with regard to the current level of supplier performance in the Eastern Cape Province automotive industry highlighted mainly three problem areas. These are late deliveries; the inability of suppliers to respond to customer schedule changes; as well as a lack of continuous improvement. Late deliveries which lead to production stoppages, with its resultant high costs, as well as the receipt of below-par quality products, were revealed as the main consequences when dealing with suppliers whose performance are not world-class. The main actions taken and programmes or incentives offered by automotive business firms to bring inferior suppliers more in line with world-class performance, include the rewarding of good suppliers by granting them more business; applying formal supplier performance evaluations; and having regular supplier audits.
- Full Text:
- Date Issued: 2009
- Authors: Cook, Gavin Trevor
- Date: 2009
- Subjects: Automobile industry and trade -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9335 , http://hdl.handle.net/10948/935 , Automobile industry and trade -- South Africa
- Description: Over and above the fact that South African automotive business firms do not have the advantages of a major domestic market and are far removed from the major world markets, they face the challenges of operating in a tough and ever-changing environment. This environment is characterised by a global recession, aggressive global competition, high inflation and more demanding customers. To overcome these obstacles and to ensure their continuous success and existence, these domestic firms need to create a competitive advantage. The establishment of such a competitive advantage is dependent on a number of factors which mainly include sourcing from a world-class supplier base in terms of price, quality and service delivery. The main objective and central theme of this study is to determine the factors that are required by a supplier in the South African automotive industry to be classified as a world-class supplier. In support of the main objective, it was necessary to source the reasons why a firm would find it important to trade with a world-class supplier base, and to determine whether the current levels of supplier performance as experienced by buying firms in the Eastern Cape automotive industry, could be regarded as world-class. Furthermore, the study set out to determine the consequences to customer firms of inferior supplier performance, as well as the actions currently taken and support programmes in place to bring suppliers in line with world-class standards. As a starting point to the study, a literature review was undertaken which revealed the definite interdependence between a business firm and the environment in which it operates. The review underlined the need for environmental scanning as a means to proactively manage the impact of environmental changes on a firm. Porter’s value chain and business process re-engineering, as discussed in the study, are also perceived as means to manage environmental changes. The literature study further revealed some of the latest business trends followed by automotive business firms, as well as the expected supplier buy-in to ensure success. A statistical analysis on the quantitative data gathered, grouped specific items (questions) that relate to the study’s main objective with three respective individual supplier performance areas. A confirmatory factor analysis which focused on the three factors, namely quality, pricing and service delivery was carried out to assess the validity of the questions used for gathering the research data. The Cronbach Alphas determined for the three factors portrayed the reliability of the research instrument as acceptable. The empirical study revealed a few main factors that automotive business firms strongly perceive as being key to the establishment of a world-class supplier base. These factors are: a culture of continuous improvement; consistently meeting delivery deadlines by being able to respond to customer schedule changes; quoting fair prices and having respect for business ethics; as well as the consistent application of a quality policy which leads to conformance to specifications and subsequent high levels of product reliability. The empirical study also identified the following benefits enjoyed by customer business firms when trading with a world-class supplier base: Firms are able to be more flexible to customer schedule changes; they receive products that meet specifications; and they are able to operate at lower costs. The empirical findings with regard to the current level of supplier performance in the Eastern Cape Province automotive industry highlighted mainly three problem areas. These are late deliveries; the inability of suppliers to respond to customer schedule changes; as well as a lack of continuous improvement. Late deliveries which lead to production stoppages, with its resultant high costs, as well as the receipt of below-par quality products, were revealed as the main consequences when dealing with suppliers whose performance are not world-class. The main actions taken and programmes or incentives offered by automotive business firms to bring inferior suppliers more in line with world-class performance, include the rewarding of good suppliers by granting them more business; applying formal supplier performance evaluations; and having regular supplier audits.
- Full Text:
- Date Issued: 2009
Mahatma Gandhi : a psychobiographical study
- Authors: Pillay, Koneshverrie
- Date: 2009
- Subjects: Mahatma Gandhi Institute (Mauritius) , Psychology -- Biographical methods , Psychoanalysis , Developmental psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9890 , http://hdl.handle.net/10948/1159 , Mahatma Gandhi Institute (Mauritius) , Psychology -- Biographical methods , Psychoanalysis , Developmental psychology
- Description: The study is of a psychobiographical nature, employing a psychological theory as a paradigm within which to uncover the narrative of an individual’s life. There are relatively few studies of this nature, particularly with a South African focus. The study applied a qualitative psychobiographical research method which aimed to describe Mahatma Gandhi's psychological development according to Erik Erikson’s (1950) Psychosocial Developmental Theory. Mohandas Karamchund Gandhi or Mahatma Gandhi as he was generally known was a major political and spiritual leader. Although much has been written on his life, a psychobiography has not yet been written. He was chosen as the research subject through purposive sampling on the basis of interest value, uniqueness and significance of his life. The data collection and analysis was conducted according to Yin’s (1994) ‘analytic generalization’ which incorporated Erikson’s theory of psychosocial stages. Alexander’s (1988) nine proposed guidelines assisted in the process of data analysis. The study concluded that Gandhi had attained the ego virtues of hope, will, purpose, competence, fidelity love, care and wisdom as proposed by Erikson’s (1950) Psychosocial Developmental Theory within the delineated age frame.
- Full Text:
- Date Issued: 2009
- Authors: Pillay, Koneshverrie
- Date: 2009
- Subjects: Mahatma Gandhi Institute (Mauritius) , Psychology -- Biographical methods , Psychoanalysis , Developmental psychology
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9890 , http://hdl.handle.net/10948/1159 , Mahatma Gandhi Institute (Mauritius) , Psychology -- Biographical methods , Psychoanalysis , Developmental psychology
- Description: The study is of a psychobiographical nature, employing a psychological theory as a paradigm within which to uncover the narrative of an individual’s life. There are relatively few studies of this nature, particularly with a South African focus. The study applied a qualitative psychobiographical research method which aimed to describe Mahatma Gandhi's psychological development according to Erik Erikson’s (1950) Psychosocial Developmental Theory. Mohandas Karamchund Gandhi or Mahatma Gandhi as he was generally known was a major political and spiritual leader. Although much has been written on his life, a psychobiography has not yet been written. He was chosen as the research subject through purposive sampling on the basis of interest value, uniqueness and significance of his life. The data collection and analysis was conducted according to Yin’s (1994) ‘analytic generalization’ which incorporated Erikson’s theory of psychosocial stages. Alexander’s (1988) nine proposed guidelines assisted in the process of data analysis. The study concluded that Gandhi had attained the ego virtues of hope, will, purpose, competence, fidelity love, care and wisdom as proposed by Erikson’s (1950) Psychosocial Developmental Theory within the delineated age frame.
- Full Text:
- Date Issued: 2009
Managing leader member exchange frequency effectively in a South African retail company
- Viljoen, Petrus Johannes Jacobus
- Authors: Viljoen, Petrus Johannes Jacobus
- Date: 2009
- Subjects: Communication in organizations -- South Africa , Communication in management -- South Africa , Leadership -- South Africa , Organizational behavior -- South Africa , Organizational effectiveness -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8692 , http://hdl.handle.net/10948/1106 , Communication in organizations -- South Africa , Communication in management -- South Africa , Leadership -- South Africa , Organizational behavior -- South Africa , Organizational effectiveness -- South Africa
- Description: The purpose of this research is to highlight the importance of identifying the communication frequency within the leader-member exchange (LMX) relationship, and to appreciate what the positive or negative effect of a low or high LMX frequency has on this relationship and on staff morale. Management is for the most part responsible for communication frequency and is in a position and has the means to change such frequency or to add additional communication channels. The research was based on a program introduced in a South African retail company three years ago. Data was collected from 64 stores in the Western Cape and the results were statistically analysed on the SPSS16 program. The results clearly supported the hypotheses that, in a low-communication frequency area, an increase in communication frequency has a positive effect on staff morale and that the proximity to head office (or lack of it) does not have a negative effect on staff morale.
- Full Text:
- Date Issued: 2009
- Authors: Viljoen, Petrus Johannes Jacobus
- Date: 2009
- Subjects: Communication in organizations -- South Africa , Communication in management -- South Africa , Leadership -- South Africa , Organizational behavior -- South Africa , Organizational effectiveness -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8692 , http://hdl.handle.net/10948/1106 , Communication in organizations -- South Africa , Communication in management -- South Africa , Leadership -- South Africa , Organizational behavior -- South Africa , Organizational effectiveness -- South Africa
- Description: The purpose of this research is to highlight the importance of identifying the communication frequency within the leader-member exchange (LMX) relationship, and to appreciate what the positive or negative effect of a low or high LMX frequency has on this relationship and on staff morale. Management is for the most part responsible for communication frequency and is in a position and has the means to change such frequency or to add additional communication channels. The research was based on a program introduced in a South African retail company three years ago. Data was collected from 64 stores in the Western Cape and the results were statistically analysed on the SPSS16 program. The results clearly supported the hypotheses that, in a low-communication frequency area, an increase in communication frequency has a positive effect on staff morale and that the proximity to head office (or lack of it) does not have a negative effect on staff morale.
- Full Text:
- Date Issued: 2009
Mathematical requirements for first-year BCOM students at NMMU
- Authors: Walton, Marguerite
- Date: 2009
- Subjects: Business mathematics -- South Africa , Mathematics -- Study and teaching (Higher) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10502 , http://hdl.handle.net/10948/886 , Business mathematics -- South Africa , Mathematics -- Study and teaching (Higher) -- South Africa
- Description: These studies have focused on identifying the mathematical requirements of first-year BCom students at Nelson Mandela Metropolitan University. The research methodology used in this quantitative study was to make use of interviewing, questionnaire investigation, and document analysis in the form of textbook, test and examination analysis. These methods provided data that fitted into a grounded theory approach. The study concluded by identifying the list of mathematical topics required for the first year of the core subjects in the BCom degree programme. In addition, the study found that learners who study Mathematics in the National Senior Certificate should be able to cope with the mathematical content included in their BCom degree programme, while learners studying Mathematical Literacy would probably need support in some of the areas of mathematics, especially algebra, in order to cope with the mathematical content included in their BCom degree programme. It makes a valuable contribution towards elucidating the mathematical requirements needed to improve the chances of successful BCom degree programme studies at South African universities. It also draws the contours for starting to design an efficient support course for future “at-risk” students who enter higher education studies.
- Full Text:
- Date Issued: 2009
- Authors: Walton, Marguerite
- Date: 2009
- Subjects: Business mathematics -- South Africa , Mathematics -- Study and teaching (Higher) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10502 , http://hdl.handle.net/10948/886 , Business mathematics -- South Africa , Mathematics -- Study and teaching (Higher) -- South Africa
- Description: These studies have focused on identifying the mathematical requirements of first-year BCom students at Nelson Mandela Metropolitan University. The research methodology used in this quantitative study was to make use of interviewing, questionnaire investigation, and document analysis in the form of textbook, test and examination analysis. These methods provided data that fitted into a grounded theory approach. The study concluded by identifying the list of mathematical topics required for the first year of the core subjects in the BCom degree programme. In addition, the study found that learners who study Mathematics in the National Senior Certificate should be able to cope with the mathematical content included in their BCom degree programme, while learners studying Mathematical Literacy would probably need support in some of the areas of mathematics, especially algebra, in order to cope with the mathematical content included in their BCom degree programme. It makes a valuable contribution towards elucidating the mathematical requirements needed to improve the chances of successful BCom degree programme studies at South African universities. It also draws the contours for starting to design an efficient support course for future “at-risk” students who enter higher education studies.
- Full Text:
- Date Issued: 2009
Mentoring as a strategy to develop leadership potential of female employees
- Authors: Potgieter, Deidre
- Date: 2009
- Subjects: Mentoring in business , Leadership in women , Women employees
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9278 , http://hdl.handle.net/10948/1472 , Mentoring in business , Leadership in women , Women employees
- Description: Institutions of higher learning should be doing leadership development of females to enhance the gender balance. The number of females employed in South African higher education is almost equal to the number of males, yet the highest proportions of females continue to hold the lowest academic and support positions. To compound the problem, after attracting suitable female staff, institutions do not have programmes to encourage them to remain within the system. Females need to surmount extra hurdles to be considered as leaders, and have different experiences of organisations from those of their male peers. Research suggests that women have the qualifications, skills and experiences required for leadership. This study aimed to look at mentoring as a strategy to enhance female leadership development. A literature review was conducted to understand the term mentoring and all related aspects. The aspects included the functions and phases of mentoring, as well as the process of a mentoring programme. Recently organisations have begun to realise how important mentoring can be to their success. Research has shown that mentoring facilitates leadership development through the career and psycho-social functions that the relationship provides. The study also investigated gender and leadership, and highlighted the barriers faced by women. The empirical part of this study was to determine employees‘ perceptions of mentoring. It was conducted in a Higher Education Institution. Random sampling was used to select respondents. The sample size consisted of 110 respondents. A structured pre-coded questionnaire was used to collect the data. The data was analysed Abstract Page iii using the relevant statistical package. Independent t-tests and analysis of variance techniques were used to determine statistically significant differences in perceptions between groups according to race, qualifications, period of employment and the type of appointment (academic/administrative). Statistically significant differences were found between race groups and the period of employment. Qualification and type of appointment did not significantly affect employees‘ responses. The major findings indicate a general congruence towards mentoring as a suitable strategy to enhance female leadership development. Institutional barriers were identified and the organisation needs to acknowledge and understand the organisational culture before embarking on this process. The theoretical and practical implications of the findings are discussed and recommendations based on these findings are provided.
- Full Text:
- Date Issued: 2009
- Authors: Potgieter, Deidre
- Date: 2009
- Subjects: Mentoring in business , Leadership in women , Women employees
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9278 , http://hdl.handle.net/10948/1472 , Mentoring in business , Leadership in women , Women employees
- Description: Institutions of higher learning should be doing leadership development of females to enhance the gender balance. The number of females employed in South African higher education is almost equal to the number of males, yet the highest proportions of females continue to hold the lowest academic and support positions. To compound the problem, after attracting suitable female staff, institutions do not have programmes to encourage them to remain within the system. Females need to surmount extra hurdles to be considered as leaders, and have different experiences of organisations from those of their male peers. Research suggests that women have the qualifications, skills and experiences required for leadership. This study aimed to look at mentoring as a strategy to enhance female leadership development. A literature review was conducted to understand the term mentoring and all related aspects. The aspects included the functions and phases of mentoring, as well as the process of a mentoring programme. Recently organisations have begun to realise how important mentoring can be to their success. Research has shown that mentoring facilitates leadership development through the career and psycho-social functions that the relationship provides. The study also investigated gender and leadership, and highlighted the barriers faced by women. The empirical part of this study was to determine employees‘ perceptions of mentoring. It was conducted in a Higher Education Institution. Random sampling was used to select respondents. The sample size consisted of 110 respondents. A structured pre-coded questionnaire was used to collect the data. The data was analysed Abstract Page iii using the relevant statistical package. Independent t-tests and analysis of variance techniques were used to determine statistically significant differences in perceptions between groups according to race, qualifications, period of employment and the type of appointment (academic/administrative). Statistically significant differences were found between race groups and the period of employment. Qualification and type of appointment did not significantly affect employees‘ responses. The major findings indicate a general congruence towards mentoring as a suitable strategy to enhance female leadership development. Institutional barriers were identified and the organisation needs to acknowledge and understand the organisational culture before embarking on this process. The theoretical and practical implications of the findings are discussed and recommendations based on these findings are provided.
- Full Text:
- Date Issued: 2009
Modelling and intelligent control of vehicle climatronic systems
- Sun, Jie
- Authors: Sun, Jie
- Date: 2009
- Subjects: Automobiles -- Air conditioning , Automobiles -- Motors -- Cooling systems , Automobiles -- Heating and ventilation
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9600 , http://hdl.handle.net/10948/1118 , Automobiles -- Air conditioning , Automobiles -- Motors -- Cooling systems , Automobiles -- Heating and ventilation
- Description: The modelling and control method of a vehicle climatronic system, based on MATLAB/SIMULINK, is presented. In order to achieve high modelling accuracy, a developed simulation model library is introduced. The modelling approach is described and the developed models are validated with some of experimental data obtained. The models are nonlinear, independent of fluid type and based on thermo-dynamic principles. Analysis of the cooling circuit modelling and empirical real-time control models are created by using Fuzzy logic controller and Stateflow. Both of control input and output are implemented essentially at original vehicle CAN-Bus system. Feasible digital automatic control strategy basic to fuzzy theory, hardware and software solution are given. The simulation experiment is achieved with the Hardware-in-Loop technology. This control methodology is easily operated and worth applying for any further studies or methods.
- Full Text:
- Date Issued: 2009
- Authors: Sun, Jie
- Date: 2009
- Subjects: Automobiles -- Air conditioning , Automobiles -- Motors -- Cooling systems , Automobiles -- Heating and ventilation
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9600 , http://hdl.handle.net/10948/1118 , Automobiles -- Air conditioning , Automobiles -- Motors -- Cooling systems , Automobiles -- Heating and ventilation
- Description: The modelling and control method of a vehicle climatronic system, based on MATLAB/SIMULINK, is presented. In order to achieve high modelling accuracy, a developed simulation model library is introduced. The modelling approach is described and the developed models are validated with some of experimental data obtained. The models are nonlinear, independent of fluid type and based on thermo-dynamic principles. Analysis of the cooling circuit modelling and empirical real-time control models are created by using Fuzzy logic controller and Stateflow. Both of control input and output are implemented essentially at original vehicle CAN-Bus system. Feasible digital automatic control strategy basic to fuzzy theory, hardware and software solution are given. The simulation experiment is achieved with the Hardware-in-Loop technology. This control methodology is easily operated and worth applying for any further studies or methods.
- Full Text:
- Date Issued: 2009
Modelling of size-based portfolios using a mixture of normal distributions
- Authors: Janse Van Rensburg, Stéfan
- Date: 2009
- Subjects: Capital assets pricing model
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:10569 , http://hdl.handle.net/10948/985 , Capital assets pricing model
- Description: From option pricing using the Black and Scholes model, to determining the signi cance of regression coe cients in a capital asset pricing model (CAPM), the assumption of normality was pervasive throughout the eld of nance. This was despite evidence that nancial returns were non-normal, skewed and heavy- tailed. In addition to non-normality, there remained questions about the e ect of rm size on returns. Studies examining these di erences were limited to ex- amining the mean return, with respect to an asset pricing model, and did not consider higher moments. Janse van Rensburg, Sharp and Friskin (in press) attempted to address both the problem of non-normality and size simultaneously. They (Janse van Rens- burg et al in press) tted a mixture of two normal distributions, with common mean but di erent variances, to a small capitalisation portfolio and a large cap- italisation portfolio. Comparison of the mixture distributions yielded valuable insight into the di erences between the small and large capitalisation portfolios' risk. Janse van Rensburg et al (in press), however, identi ed several shortcom- ings within their work. These included data problems, such as survivorship bias and the exclusion of dividends, and the questionable use of standard statistical tests in the presence of non-normality. This study sought to correct the problems noted in the paper by Janse van Rensburg et al (in press) and to expand upon their research. To this end survivorship bias was eliminated and an e ective dividend was included into the return calculations. Weekly data were used, rather than the monthly data of Janse van Rensburg et al (in press). More portfolios, over shorter holding periods, were considered. This allowed the authors to test whether Janse van Rensburg et al's (in press) ndings remained valid under conditions di erent to their original study. Inference was also based on bootstrapped statistics, in order to circumvent problems associated with non-normality. Additionally, several di erent speci cations of the normal mixture distribution were considered, as opposed to only the two-component scale mixture. In the following, Chapter 2 provided a literature review of previous studies on return distributions and size e ects. The data, data preparation and portfolio formation were discussed in Chapter 3. Chapter 4 gave an overview of the statistical methods and tests used throughout the study. The empirical results of these tests, prior to risk adjustment, were presented in Chapter 5. The impact of risk adjustment on the distribution of returns was documented in Chapter 6. The study ended, Chapter 7, with a summary of the results and suggestions for future research.
- Full Text:
- Date Issued: 2009
- Authors: Janse Van Rensburg, Stéfan
- Date: 2009
- Subjects: Capital assets pricing model
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:10569 , http://hdl.handle.net/10948/985 , Capital assets pricing model
- Description: From option pricing using the Black and Scholes model, to determining the signi cance of regression coe cients in a capital asset pricing model (CAPM), the assumption of normality was pervasive throughout the eld of nance. This was despite evidence that nancial returns were non-normal, skewed and heavy- tailed. In addition to non-normality, there remained questions about the e ect of rm size on returns. Studies examining these di erences were limited to ex- amining the mean return, with respect to an asset pricing model, and did not consider higher moments. Janse van Rensburg, Sharp and Friskin (in press) attempted to address both the problem of non-normality and size simultaneously. They (Janse van Rens- burg et al in press) tted a mixture of two normal distributions, with common mean but di erent variances, to a small capitalisation portfolio and a large cap- italisation portfolio. Comparison of the mixture distributions yielded valuable insight into the di erences between the small and large capitalisation portfolios' risk. Janse van Rensburg et al (in press), however, identi ed several shortcom- ings within their work. These included data problems, such as survivorship bias and the exclusion of dividends, and the questionable use of standard statistical tests in the presence of non-normality. This study sought to correct the problems noted in the paper by Janse van Rensburg et al (in press) and to expand upon their research. To this end survivorship bias was eliminated and an e ective dividend was included into the return calculations. Weekly data were used, rather than the monthly data of Janse van Rensburg et al (in press). More portfolios, over shorter holding periods, were considered. This allowed the authors to test whether Janse van Rensburg et al's (in press) ndings remained valid under conditions di erent to their original study. Inference was also based on bootstrapped statistics, in order to circumvent problems associated with non-normality. Additionally, several di erent speci cations of the normal mixture distribution were considered, as opposed to only the two-component scale mixture. In the following, Chapter 2 provided a literature review of previous studies on return distributions and size e ects. The data, data preparation and portfolio formation were discussed in Chapter 3. Chapter 4 gave an overview of the statistical methods and tests used throughout the study. The empirical results of these tests, prior to risk adjustment, were presented in Chapter 5. The impact of risk adjustment on the distribution of returns was documented in Chapter 6. The study ended, Chapter 7, with a summary of the results and suggestions for future research.
- Full Text:
- Date Issued: 2009
Music as social discourse : the contribution of popular music to the awareness and prevention of HIV/AIDS in Nairobi, Kenya
- Authors: Gitonga, Priscilla Nyawira
- Date: 2009
- Subjects: AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8510 , http://hdl.handle.net/10948/962 , AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Description: This dissertation is a critical, theoretical study focussing is on the contribution that popular music makes towards raising awareness and promoting the prevention of HIV/Aids in Nairobi, Kenya. Towards this end, an analysis of the lyrics and musical gestures of four Kenyan pop music songs is undertaken in order to highlight their communicative capabilities in this regard. These songs, namely, are Lulumbe by Wasike wa Musungu, Juala by Circute and Jo-el, Vuta Pumz by The Longombas, and Dunia Mbaya Chunguze by Princess Jully. The context in which these musical analyses occur is provided in: - An overview of the Kenya of today, in particular that of the diverse and hybrid ethnic, linguistic, musical and cultural practices of Nairobi, and of the various youth cultures in that city, as well as in an overview of the extent of the HIV/Aids pandemic in Kenya, especially amongst the youth of Nairobi, with some reflection on existing interventions. - An overview of current trends in popular music analysis and an explanation of the author’s own eclectic semiotic analytical methodology within this context. The study concludes that a repeating strategy may be discerned on the part of the composers and performers in question, namely, to first engage audiences through language and music with which they are familiar, and then to encourage audiences to confront the unknown and unfamiliar in music and language, but also ultimately in terms of their social practices. The known and the familiar is highlighted both in the lyrics and in the music itself. It includes use of commonlyspoken languages and dialects, popular musical styles typical of the particular sub-culture, and references to the day-to-day experiences of the ordinary person.
- Full Text:
- Date Issued: 2009
- Authors: Gitonga, Priscilla Nyawira
- Date: 2009
- Subjects: AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:8510 , http://hdl.handle.net/10948/962 , AIDS (Disease) -- Songs and music -- Nairobi -- Kenya , AIDS (Disease) -- Social aspects -- Nairobi -- Kenya , AIDS (Disease) -- Prevention , Music therapy
- Description: This dissertation is a critical, theoretical study focussing is on the contribution that popular music makes towards raising awareness and promoting the prevention of HIV/Aids in Nairobi, Kenya. Towards this end, an analysis of the lyrics and musical gestures of four Kenyan pop music songs is undertaken in order to highlight their communicative capabilities in this regard. These songs, namely, are Lulumbe by Wasike wa Musungu, Juala by Circute and Jo-el, Vuta Pumz by The Longombas, and Dunia Mbaya Chunguze by Princess Jully. The context in which these musical analyses occur is provided in: - An overview of the Kenya of today, in particular that of the diverse and hybrid ethnic, linguistic, musical and cultural practices of Nairobi, and of the various youth cultures in that city, as well as in an overview of the extent of the HIV/Aids pandemic in Kenya, especially amongst the youth of Nairobi, with some reflection on existing interventions. - An overview of current trends in popular music analysis and an explanation of the author’s own eclectic semiotic analytical methodology within this context. The study concludes that a repeating strategy may be discerned on the part of the composers and performers in question, namely, to first engage audiences through language and music with which they are familiar, and then to encourage audiences to confront the unknown and unfamiliar in music and language, but also ultimately in terms of their social practices. The known and the familiar is highlighted both in the lyrics and in the music itself. It includes use of commonlyspoken languages and dialects, popular musical styles typical of the particular sub-culture, and references to the day-to-day experiences of the ordinary person.
- Full Text:
- Date Issued: 2009
New platinum coordination compounds : their synthesis, characterization and anticancer application
- Authors: Oosthuizen, Lukas Marthinus
- Date: 2009
- Subjects: Platinum compounds , Antineoplastic agents
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10430 , http://hdl.handle.net/10948/d1018795
- Description: The aim of this thesis was to investigate the properties of novel platinum compounds with possible potential as anticancer agents, and to determine how their behaviour could lead to a better understanding of the chemistry involved. The final criteria were improvement of their anticancer behaviour. Since many questions are still unanswered as to the role of sulfur in anticancer action, studies were undertaken to synthesize novel platinum(II) complexes having non-leaving groups consisting of a combination of an aromatic nitrogen and thioetherial sulfur capable of forming a five membered ring upon coordination. The structural unit was 1-methyl-2-methylthioalkyl/aryl. Numerous complexes formed by these ligands each having chloro, bromo, iodo and oxalato leaving groups were then fully characterized. The results obtained by the various synthetic methods were compared and explained in terms of the chemistry involved. The role of the sulfur donor was indicated in both the halo- and oxalato-complexes and proved to be strongly influenced by the nature of the leaving groups. Their differences are reflected in their anticancer behaviour. The study was extended to mononitroplatinum(IV) complexes, in view of the kinetically stable platinum(IV) compounds and advantages related to this. A specific mononitroplatinum(IV) complex which proved to have good anticancer and STAT 3 properties could according to the literature not be synthesized successfully in a good yield and a high degree of purity. The results of extensive studies showed that the main problem centred around the simultaneous reactions in equilibrium during the synthesis. A number of these species formed as a result of side reactions could be identified and their close separation factors indicated chromatographically. The mechanism of these reactions and the unstable intermediate species involved could be rationalized and compared to analogues in the literature. All the complexes studied were characterized by spectral and thermal methods both in solution as well as the solid state. Their anticancer behaviour towards three anticancer cell lines (Hela, MCF 7, Ht 29) were determined and acted as a guide towards possible structural modifications for their improved capability. Three crystal structures of platinum(II) complexes were determined. The extent of the ionization of the platinum(II) complexes as well the redox potentials (Pt(II) / Pt(IV)) of the platinum(IV) complexes were particularly important factors pertaining to their anticancer action.
- Full Text:
- Date Issued: 2009
- Authors: Oosthuizen, Lukas Marthinus
- Date: 2009
- Subjects: Platinum compounds , Antineoplastic agents
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10430 , http://hdl.handle.net/10948/d1018795
- Description: The aim of this thesis was to investigate the properties of novel platinum compounds with possible potential as anticancer agents, and to determine how their behaviour could lead to a better understanding of the chemistry involved. The final criteria were improvement of their anticancer behaviour. Since many questions are still unanswered as to the role of sulfur in anticancer action, studies were undertaken to synthesize novel platinum(II) complexes having non-leaving groups consisting of a combination of an aromatic nitrogen and thioetherial sulfur capable of forming a five membered ring upon coordination. The structural unit was 1-methyl-2-methylthioalkyl/aryl. Numerous complexes formed by these ligands each having chloro, bromo, iodo and oxalato leaving groups were then fully characterized. The results obtained by the various synthetic methods were compared and explained in terms of the chemistry involved. The role of the sulfur donor was indicated in both the halo- and oxalato-complexes and proved to be strongly influenced by the nature of the leaving groups. Their differences are reflected in their anticancer behaviour. The study was extended to mononitroplatinum(IV) complexes, in view of the kinetically stable platinum(IV) compounds and advantages related to this. A specific mononitroplatinum(IV) complex which proved to have good anticancer and STAT 3 properties could according to the literature not be synthesized successfully in a good yield and a high degree of purity. The results of extensive studies showed that the main problem centred around the simultaneous reactions in equilibrium during the synthesis. A number of these species formed as a result of side reactions could be identified and their close separation factors indicated chromatographically. The mechanism of these reactions and the unstable intermediate species involved could be rationalized and compared to analogues in the literature. All the complexes studied were characterized by spectral and thermal methods both in solution as well as the solid state. Their anticancer behaviour towards three anticancer cell lines (Hela, MCF 7, Ht 29) were determined and acted as a guide towards possible structural modifications for their improved capability. Three crystal structures of platinum(II) complexes were determined. The extent of the ionization of the platinum(II) complexes as well the redox potentials (Pt(II) / Pt(IV)) of the platinum(IV) complexes were particularly important factors pertaining to their anticancer action.
- Full Text:
- Date Issued: 2009
Obstacles faced by news journalists in investigative reporting: analysis of four Botswana newspapers, June 2008 - October 2008
- Authors: Pule, Kediretswe
- Date: 2009
- Subjects: Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8398 , http://hdl.handle.net/10948/869 , Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Description: In this research study, the researcher investigates obstacles faced by news journalists in investigative journalism in a democracy as experienced in Botswana. Investigative journalism and democracy have a symbiotic relationship. This relationship serves to make the public sensitive about, and aware of, injustices and undemocratic practices and it could, ultimately, contribute significantly to the process of democratization (Faure 2005: 155). Unfortunately, in their endeavor to keep up with the ethos of investigative journalism, journalists meet obstacles that range from legal to financial issues. The author investigates those factors that reporters in Botswana rate as having the greatest impact on their investigative efforts. The study also assesses the attitudes of journalists in the country towards the roles and responsibilities of the fourth estate, which supports investigative reporting. Investigative journalism is centered on disclosure, described by six elements: public interest, theme, accuracy, follow-up reports, consequences and questioning the status quo (Faure 2005:160; Marron 1995:1). The researcher interrogated the current practice of investigative journalism in newsrooms in the Botswana context, by means of a self-administered questionnaire. A cumulative sum of scores of each rank order for each obstacle was used to observe the one rated the most impeding by Botswana journalists. Elementary descriptive statistics in the form of percentages were used to assess attitudes of Botswana journalists towards investigative journalism. The same method was used to assess the proportion of investigative stories in four sampled Botswana newspapers. The contents of the respective newspapers were assessed against the five elements of investigative reporting that include: theme, public interest, questioning the status quo, accuracy, follow-up reports and consequences.
- Full Text:
- Date Issued: 2009
- Authors: Pule, Kediretswe
- Date: 2009
- Subjects: Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8398 , http://hdl.handle.net/10948/869 , Investigative reporting , Journalism -- Political aspects , Journalists -- Legal status, laws, etc
- Description: In this research study, the researcher investigates obstacles faced by news journalists in investigative journalism in a democracy as experienced in Botswana. Investigative journalism and democracy have a symbiotic relationship. This relationship serves to make the public sensitive about, and aware of, injustices and undemocratic practices and it could, ultimately, contribute significantly to the process of democratization (Faure 2005: 155). Unfortunately, in their endeavor to keep up with the ethos of investigative journalism, journalists meet obstacles that range from legal to financial issues. The author investigates those factors that reporters in Botswana rate as having the greatest impact on their investigative efforts. The study also assesses the attitudes of journalists in the country towards the roles and responsibilities of the fourth estate, which supports investigative reporting. Investigative journalism is centered on disclosure, described by six elements: public interest, theme, accuracy, follow-up reports, consequences and questioning the status quo (Faure 2005:160; Marron 1995:1). The researcher interrogated the current practice of investigative journalism in newsrooms in the Botswana context, by means of a self-administered questionnaire. A cumulative sum of scores of each rank order for each obstacle was used to observe the one rated the most impeding by Botswana journalists. Elementary descriptive statistics in the form of percentages were used to assess attitudes of Botswana journalists towards investigative journalism. The same method was used to assess the proportion of investigative stories in four sampled Botswana newspapers. The contents of the respective newspapers were assessed against the five elements of investigative reporting that include: theme, public interest, questioning the status quo, accuracy, follow-up reports and consequences.
- Full Text:
- Date Issued: 2009
Of fences and peace between neighbours
- Authors: Krüger, Rósaan
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68909 , vital:29338 , https://hdl.handle.net/10520/EJC85309
- Description: Publisher version , The speaker in the poem "Mending Wall" by American poet Robert Frost questions the wisdom of the saying that "Good Fences Make Good Neighbo[u]rs" (1914 North of Boston lines 27 and 45). The walls or fences referred to in the poem represent more than just physical barriers separating adjacent premises; the speaker sees them as representing obstacles to communication and friendship between individuals. Seen from the perspective of the speaker, a fence or wall is a "bad" thing. But the speaker is but one of the parties to the neighbourly relationship. For the speaker's neighbour, a wall or a fence is "a protector of privacy" (Watson "Frost's Wall : The View from the Other Side" 1971 44 The New England Quarterly 653 655). Thus there are two views on walls or fences: they can be seen negatively as obstructing good relations, or positively as dividers that secure good relations between neighbours by separating them and protecting their privacy rights.
- Full Text: false
- Date Issued: 2009
- Authors: Krüger, Rósaan
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68909 , vital:29338 , https://hdl.handle.net/10520/EJC85309
- Description: Publisher version , The speaker in the poem "Mending Wall" by American poet Robert Frost questions the wisdom of the saying that "Good Fences Make Good Neighbo[u]rs" (1914 North of Boston lines 27 and 45). The walls or fences referred to in the poem represent more than just physical barriers separating adjacent premises; the speaker sees them as representing obstacles to communication and friendship between individuals. Seen from the perspective of the speaker, a fence or wall is a "bad" thing. But the speaker is but one of the parties to the neighbourly relationship. For the speaker's neighbour, a wall or a fence is "a protector of privacy" (Watson "Frost's Wall : The View from the Other Side" 1971 44 The New England Quarterly 653 655). Thus there are two views on walls or fences: they can be seen negatively as obstructing good relations, or positively as dividers that secure good relations between neighbours by separating them and protecting their privacy rights.
- Full Text: false
- Date Issued: 2009
Optimizing the recovery rate of Mycobacterium species from gastric lavages in children at an urban Zambian hospital
- Authors: Lubasi, David
- Date: 2009
- Subjects: Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10118 , http://hdl.handle.net/10948/1440 , Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Description: Tuberculosis (TB) has re-emerged as a major worldwide public health hazard with increasing incidence among adults and children. Although cases among children represent a small percentage of all TB cases, they are a reservoir from which many adult cases will arise. Estimates indicate that 9 million people develop TB annually, out of which 1 million (11 percent) occur in children less than 15 years old. Childhood tuberculosis is on the increase worldwide because of persisting inability to conform the diagnosis, leading to a large number of children dying of undiagnosed tuberculosis. Diagnosis of pulmonary tuberculosis has depended on bacteriological examination of sputum. In most of the developing countries sputum smear microscopy has been used as it has been found to be cheap and relative efficient. As a result of the high TB burden, there is an urgent need for improved methods of laboratory diagnosis of TB. This is especially needed in children were diagnosis is more challenging as mycobacteria is being detected in fewer than 50 percent of the cases. Children cannot produce adequate sputum samples for examination. Their sputum samples, if produced, has a low bacterial yield and making detection of mycobacteria by using the smear microscopy difficult. Therefore, gastric lavages from children are being recommended as the best specimen for culture. In this study, gastric lavages from 408 children suspected of having tuberculosis were examined for the recovery of mycobacteria. Recovery was optimized by the use of the relatively new non-radiometric fully automated BACTEC MGIT 960. BACTEC MGIT 960 produced a positivity rate of 27.2 percent against 17.2 percent that of Lowenstein-Jensen (L-J) media, which is a conventional culture method used widely. The direct microscopy which is the cheapest traditional method used in diagnosis of tuberculosis (TB) yielded a 5.6 percent positive rate. The BACTEC MGIT 960 had also a very high isolate detection rate of 98.2 percent compared to that of L-J media of 61.9 percent, and only 20.4 percent were detected with the direct microscopy. On time taken to detection or mean time to detection (TTD) of v isolates, the BACTEC MGIT 960 technique had a shorter mean time to detection, 12.5 days as compared to 34.3 days shown by the L-J media technique. The study showed that children normally get tuberculosis from adult members of the household. A positive TB case was found in the households of 55.4 percent of the suspects. The study has found that 46.4 percent of the children below the age of 4 years developed the disease, compared to 10.5 percent the older children in the age group 10 to 14 years. The study found that tuberculosis in children is mainly caused by Mycobacterium tuberculosis. Out of the 113 isolates detected, 110 (97.3 percent) were M. tuberculosis. The remaining 2.7 percent were the non-tuberculous M. avium complex and M. kansasii. It was inconclusive whether the 2.7 percent of other species were causing tuberculosis and this need to be studied further.
- Full Text:
- Date Issued: 2009
- Authors: Lubasi, David
- Date: 2009
- Subjects: Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10118 , http://hdl.handle.net/10948/1440 , Mycobacterium , Tuberculosis in children -- Diagnosis -- Zambia
- Description: Tuberculosis (TB) has re-emerged as a major worldwide public health hazard with increasing incidence among adults and children. Although cases among children represent a small percentage of all TB cases, they are a reservoir from which many adult cases will arise. Estimates indicate that 9 million people develop TB annually, out of which 1 million (11 percent) occur in children less than 15 years old. Childhood tuberculosis is on the increase worldwide because of persisting inability to conform the diagnosis, leading to a large number of children dying of undiagnosed tuberculosis. Diagnosis of pulmonary tuberculosis has depended on bacteriological examination of sputum. In most of the developing countries sputum smear microscopy has been used as it has been found to be cheap and relative efficient. As a result of the high TB burden, there is an urgent need for improved methods of laboratory diagnosis of TB. This is especially needed in children were diagnosis is more challenging as mycobacteria is being detected in fewer than 50 percent of the cases. Children cannot produce adequate sputum samples for examination. Their sputum samples, if produced, has a low bacterial yield and making detection of mycobacteria by using the smear microscopy difficult. Therefore, gastric lavages from children are being recommended as the best specimen for culture. In this study, gastric lavages from 408 children suspected of having tuberculosis were examined for the recovery of mycobacteria. Recovery was optimized by the use of the relatively new non-radiometric fully automated BACTEC MGIT 960. BACTEC MGIT 960 produced a positivity rate of 27.2 percent against 17.2 percent that of Lowenstein-Jensen (L-J) media, which is a conventional culture method used widely. The direct microscopy which is the cheapest traditional method used in diagnosis of tuberculosis (TB) yielded a 5.6 percent positive rate. The BACTEC MGIT 960 had also a very high isolate detection rate of 98.2 percent compared to that of L-J media of 61.9 percent, and only 20.4 percent were detected with the direct microscopy. On time taken to detection or mean time to detection (TTD) of v isolates, the BACTEC MGIT 960 technique had a shorter mean time to detection, 12.5 days as compared to 34.3 days shown by the L-J media technique. The study showed that children normally get tuberculosis from adult members of the household. A positive TB case was found in the households of 55.4 percent of the suspects. The study has found that 46.4 percent of the children below the age of 4 years developed the disease, compared to 10.5 percent the older children in the age group 10 to 14 years. The study found that tuberculosis in children is mainly caused by Mycobacterium tuberculosis. Out of the 113 isolates detected, 110 (97.3 percent) were M. tuberculosis. The remaining 2.7 percent were the non-tuberculous M. avium complex and M. kansasii. It was inconclusive whether the 2.7 percent of other species were causing tuberculosis and this need to be studied further.
- Full Text:
- Date Issued: 2009
Patterns and determinants of species richness in mesic temparate grasslands of South Africa
- Authors: Hoare, David Barry
- Date: 2009
- Subjects: Grassland ecology -- South Africa -- Eastern Cape , Plant diversity -- South Africa -- Eastern Cape , Vegetation and climate
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10613 , http://hdl.handle.net/10948/1275 , Grassland ecology -- South Africa -- Eastern Cape , Plant diversity -- South Africa -- Eastern Cape , Vegetation and climate
- Description: The aim of this study is to gain a predictive understanding of the patterns and determinants of plant biodiversity in temperate, mesic grasslands of South Africa with a primary focus on the geographical area of the Eastern Cape. From a review of the literature on hypotheses explaining diversity (Chapter 2) it was possible to formulate a number of hypotheses that could be tested to explain species richness patterns in Eastern Cape grasslands. This thesis is organised so that each main chapter deals with a specific body of theory concerning the explanation of diversity patterns. A detailed description of the study area is provided (Chapter 3), including environmental variation and a description of major vegetation patterns. A summary is provided of grassland plant community patterns, as determined by phytosociological studies in the study area. A multivariate analysis of environmental variables was undertaken to determine which variables contributed the most towards explaining environmental variation in the study area and to determine whether any variables co-vary, a possible problem for any multivariate analysis in later chapters. Altitude produced one of the strongest gradients in the study area. There were a number of variables that were correlated with altitude, most notably temperature. Rainfall co-varied partially with altitude, but there was also a strong rainfall gradient perpendicular to the altitude gradient. A description of species richness, diversity and evenness patterns at the plot scale within different grassland plant communities of the Eastern Cape is provided in Chapter 4. To determine whether the environment acts differently on different growth forms, the contribution to species richness by different major growth forms is analysed. Furthermore, since the majority of literature attempts to explain diversity in terms of environmental factors, it was necessary to analyse the relationship between species richness and various environmental variables. The results indicate that there is high variation in species richness both within and among grassland communities. Forbs make the most significant contribution to overall species richness per 100 m2, followed by grasses. Variance in richness of all species together is not significantly related to environmental variables in mesic grasslands, but is significantly related to environmental variables in semi-arid grasslands. The result of greatest interest from this chapter is the fact that richness amongst different life-forms in the same place is explained by different environmental factors, indicating that the environmental factors that affect coexistence of species have a different effect on different life-forms. A classification of all the species of the dataset into plant functional types using a multivariate approach based on functional traits was conducted (Chapter 5). The grass species were classified into 16 functional types and the forbs into 14 functional types. The functional type classification provided the opportunity for undertaking analyses to develop an understanding of 8 the contribution by niche differentiation towards promoting species richness (Chapter 6). The results provide evidence of niche differentiation in the grasslands of the study area and also that niche differentiation promotes species richness in the grasslands of the study area. It was found that higher rainfall grasslands are less structured by niche differentiation than semi-arid grasslands. A regional / historical analysis is undertaken (Chapter 7) to investigate the relationship between the regional species pool and local richness, and the relationship between local richness and phytochorological diversity. Regional richness appears to have little effect in promoting local richness in grassland plant communities of the study area except at sites where there is high local richness. This provides an indication that regional richness only promotes local richness in the absence of local limiting factors. Phytochorological diversity promotes local richness, but mostly through diversity amongst species with narrow distribution ranges. Some theories ascertain that seasonal uncertainty may provide opportunities to species that would otherwise be outcompeted and thereby promote local richness. The degree to which seasonal uncertainty and seasonality promote local richness in the Eastern Cape grasslands was therefore investigated (Chapter 8). A weak relationship exists between these variables and local species richness in grassland communities of the study area, indicating that they do not promote niche differentiation to a significant degree in the study area. It is clear that in the grasslands of the Eastern Cape, environmental limiting factors are more important in semi-arid grasslands and species interactions are more important in mesic grasslands for structuring plant communities (Chapter 9, Discussion). Regional processes do not appear to be important in structuring local communities, but the analysis undertaken in this study shows that they may be significant when factors operating at the other two levels are overcome (species interactions and environmental limiting factors.
- Full Text:
- Date Issued: 2009
- Authors: Hoare, David Barry
- Date: 2009
- Subjects: Grassland ecology -- South Africa -- Eastern Cape , Plant diversity -- South Africa -- Eastern Cape , Vegetation and climate
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10613 , http://hdl.handle.net/10948/1275 , Grassland ecology -- South Africa -- Eastern Cape , Plant diversity -- South Africa -- Eastern Cape , Vegetation and climate
- Description: The aim of this study is to gain a predictive understanding of the patterns and determinants of plant biodiversity in temperate, mesic grasslands of South Africa with a primary focus on the geographical area of the Eastern Cape. From a review of the literature on hypotheses explaining diversity (Chapter 2) it was possible to formulate a number of hypotheses that could be tested to explain species richness patterns in Eastern Cape grasslands. This thesis is organised so that each main chapter deals with a specific body of theory concerning the explanation of diversity patterns. A detailed description of the study area is provided (Chapter 3), including environmental variation and a description of major vegetation patterns. A summary is provided of grassland plant community patterns, as determined by phytosociological studies in the study area. A multivariate analysis of environmental variables was undertaken to determine which variables contributed the most towards explaining environmental variation in the study area and to determine whether any variables co-vary, a possible problem for any multivariate analysis in later chapters. Altitude produced one of the strongest gradients in the study area. There were a number of variables that were correlated with altitude, most notably temperature. Rainfall co-varied partially with altitude, but there was also a strong rainfall gradient perpendicular to the altitude gradient. A description of species richness, diversity and evenness patterns at the plot scale within different grassland plant communities of the Eastern Cape is provided in Chapter 4. To determine whether the environment acts differently on different growth forms, the contribution to species richness by different major growth forms is analysed. Furthermore, since the majority of literature attempts to explain diversity in terms of environmental factors, it was necessary to analyse the relationship between species richness and various environmental variables. The results indicate that there is high variation in species richness both within and among grassland communities. Forbs make the most significant contribution to overall species richness per 100 m2, followed by grasses. Variance in richness of all species together is not significantly related to environmental variables in mesic grasslands, but is significantly related to environmental variables in semi-arid grasslands. The result of greatest interest from this chapter is the fact that richness amongst different life-forms in the same place is explained by different environmental factors, indicating that the environmental factors that affect coexistence of species have a different effect on different life-forms. A classification of all the species of the dataset into plant functional types using a multivariate approach based on functional traits was conducted (Chapter 5). The grass species were classified into 16 functional types and the forbs into 14 functional types. The functional type classification provided the opportunity for undertaking analyses to develop an understanding of 8 the contribution by niche differentiation towards promoting species richness (Chapter 6). The results provide evidence of niche differentiation in the grasslands of the study area and also that niche differentiation promotes species richness in the grasslands of the study area. It was found that higher rainfall grasslands are less structured by niche differentiation than semi-arid grasslands. A regional / historical analysis is undertaken (Chapter 7) to investigate the relationship between the regional species pool and local richness, and the relationship between local richness and phytochorological diversity. Regional richness appears to have little effect in promoting local richness in grassland plant communities of the study area except at sites where there is high local richness. This provides an indication that regional richness only promotes local richness in the absence of local limiting factors. Phytochorological diversity promotes local richness, but mostly through diversity amongst species with narrow distribution ranges. Some theories ascertain that seasonal uncertainty may provide opportunities to species that would otherwise be outcompeted and thereby promote local richness. The degree to which seasonal uncertainty and seasonality promote local richness in the Eastern Cape grasslands was therefore investigated (Chapter 8). A weak relationship exists between these variables and local species richness in grassland communities of the study area, indicating that they do not promote niche differentiation to a significant degree in the study area. It is clear that in the grasslands of the Eastern Cape, environmental limiting factors are more important in semi-arid grasslands and species interactions are more important in mesic grasslands for structuring plant communities (Chapter 9, Discussion). Regional processes do not appear to be important in structuring local communities, but the analysis undertaken in this study shows that they may be significant when factors operating at the other two levels are overcome (species interactions and environmental limiting factors.
- Full Text:
- Date Issued: 2009
Phases of sustainable development in small and medium enterprise (SME) retail outlets
- Authors: Brower, Marlon
- Date: 2009
- Subjects: Sustainable development -- South Africa -- Nelson Mandela Bay Municipality , Small business -- South Africa -- Nelson Mandela Bay Municipality , Outlet stores -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8806 , http://hdl.handle.net/10948/d1018506
- Description: SMEs play a vital role in the country. For the purpose of the study the focus was on SMEs in the Nelson Mandela Bay Municipality Jurisdiction. Businesses which met the SME criteria (refer to Chapter 1, Section 1.7.1), (Du Plessis, 1996: 162; Marx et al., 1998: 728) were included in this study. The study is formed around the aspects of business which contribute to the growth of the business in the long term. A specific study was conducted on the ethnic entrepreneur and the aspects that influence business growth. There are many factors which influence the growth of the business; for the purpose of this study, a specific focus was placed on: (1) knowledge with regard to business; (2) entrepreneurial culture; (3) brand management; (4) location of the business; (5) business relationships; and (6) cultural influences. These variables will determine how the growth of the business is ultimately influenced. The research can also discover from respondents what they view as important in their lives. The study then goes further to analyse whether the independent variables, as reacted to by the respondents, have a significant or non-significant effect on growth.
- Full Text:
- Date Issued: 2009
- Authors: Brower, Marlon
- Date: 2009
- Subjects: Sustainable development -- South Africa -- Nelson Mandela Bay Municipality , Small business -- South Africa -- Nelson Mandela Bay Municipality , Outlet stores -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8806 , http://hdl.handle.net/10948/d1018506
- Description: SMEs play a vital role in the country. For the purpose of the study the focus was on SMEs in the Nelson Mandela Bay Municipality Jurisdiction. Businesses which met the SME criteria (refer to Chapter 1, Section 1.7.1), (Du Plessis, 1996: 162; Marx et al., 1998: 728) were included in this study. The study is formed around the aspects of business which contribute to the growth of the business in the long term. A specific study was conducted on the ethnic entrepreneur and the aspects that influence business growth. There are many factors which influence the growth of the business; for the purpose of this study, a specific focus was placed on: (1) knowledge with regard to business; (2) entrepreneurial culture; (3) brand management; (4) location of the business; (5) business relationships; and (6) cultural influences. These variables will determine how the growth of the business is ultimately influenced. The research can also discover from respondents what they view as important in their lives. The study then goes further to analyse whether the independent variables, as reacted to by the respondents, have a significant or non-significant effect on growth.
- Full Text:
- Date Issued: 2009
Planning and managing curriculum implementation in rural schools: an investigation
- Authors: Labane, Nokubonga
- Date: 2009
- Subjects: Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9522 , http://hdl.handle.net/10948/998 , Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Description: Fleisch (2002) and Jansen and Christie (1999) hold that implementation of the national school curriculum in post-apartheid South Africa was riddled with uncertainties, ineffective classroom management and a general lack of academic performance by learners, mainly as a result of inadequate training and support (SMTs) to support the implementation process through proper planning and subsequent management of the implementation (Rogan and Grayson, 2003:1172-1195). Middlewood (2003a: 66- 68) thus assigns the primary responsibility of planning, managing and overseeing the curriculum implementation process to the SMT. Research problem and question 1 In the context of this study, the School Management Team (SMT) includes the school principal, the deputy-principal and the head(s) of department(s) or senior teachers. 4 for teachers in the classroom. Having considered the above essential aspects related to curriculum implementation, there is thus reason to be concerned about the effectiveness of curriculum implementation in South African schools, specifically in rural schools. Due to their remoteness, limited resources, and fluctuating quality of teacher expertise, these schools are often more challenged in terms of curriculum implementation (Delport and Mangwaya, 2008:224). Although there are many factors affecting the (in)effectiveness of implementation, this study regards a school’s curriculum implementation plans and the subsequent management of these implementation plans as crucial to ensuring successful implementation of a new curriculum. The central research problem that guided this study thus relates to the planning and subsequent management of curriculum implementation at school level. The above problem has culminated in the formulation of the following research question: How do selected rural schools plan and manage curriculum implementation?.
- Full Text:
- Date Issued: 2009
- Authors: Labane, Nokubonga
- Date: 2009
- Subjects: Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9522 , http://hdl.handle.net/10948/998 , Curriculum planning -- South Africa , Teacher participation in curriculum planning , Education -- South Africa -- Curricula
- Description: Fleisch (2002) and Jansen and Christie (1999) hold that implementation of the national school curriculum in post-apartheid South Africa was riddled with uncertainties, ineffective classroom management and a general lack of academic performance by learners, mainly as a result of inadequate training and support (SMTs) to support the implementation process through proper planning and subsequent management of the implementation (Rogan and Grayson, 2003:1172-1195). Middlewood (2003a: 66- 68) thus assigns the primary responsibility of planning, managing and overseeing the curriculum implementation process to the SMT. Research problem and question 1 In the context of this study, the School Management Team (SMT) includes the school principal, the deputy-principal and the head(s) of department(s) or senior teachers. 4 for teachers in the classroom. Having considered the above essential aspects related to curriculum implementation, there is thus reason to be concerned about the effectiveness of curriculum implementation in South African schools, specifically in rural schools. Due to their remoteness, limited resources, and fluctuating quality of teacher expertise, these schools are often more challenged in terms of curriculum implementation (Delport and Mangwaya, 2008:224). Although there are many factors affecting the (in)effectiveness of implementation, this study regards a school’s curriculum implementation plans and the subsequent management of these implementation plans as crucial to ensuring successful implementation of a new curriculum. The central research problem that guided this study thus relates to the planning and subsequent management of curriculum implementation at school level. The above problem has culminated in the formulation of the following research question: How do selected rural schools plan and manage curriculum implementation?.
- Full Text:
- Date Issued: 2009
Polarization mode dispersion emulation and the impact of high first-order PMD segments in optical telecommunication systems
- Authors: Musara, Vitalis
- Date: 2009
- Subjects: Optical communications , Fiber optics , Polarization (Light)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10519 , http://hdl.handle.net/10948/1138 , Optical communications , Fiber optics , Polarization (Light)
- Description: In this study, focus is centred on the measurement and emulation of first-order (FO-) and second-order (SO-) polarization mode dispersion (PMD). PMD has deleterious effects on the performance of high speed optical transmission network systems from 10 Gb/s and above. The first step was characterising deployed fibres for PMD and monitoring the state of polarization (SOP) light experiences as it propagates through the fibre. The PMD and SOP changes in deployed fibres were stochastic due to varying intrinsic and extrinsic perturbation changes. To fully understand the PMD phenomenon in terms of measurement accuracy, its complex behaviour, its implications, mitigation and compensation, PMD emulation is crucial. This thesis presents emulator designs which fall into different emulator categories. The key to these designs were the PMD equations and background on the PMD phenomenon. The cross product from the concatenation equation was applied in order to determine the coupling angle β (between 0o and 180o) that results in the SO-PMD of the emulator designs to be either adjustable or fixed. The digital delay line (DDL) or single polarization maintaining fibre (PMF) section was used to give a certain amount of FO-PMD but negligible SO-PMD. PMF sections (birefringent sections) were concatenated together to ensure FO- and SO-PMD coexist, emulating deployed fibres. FO- and SO-PMD can be controlled by altering mode coupling (coupling angles) and birefringence distribution. Emulators with PMD statistics approaching the theoretical distributions had high random coupling and several numbers of randomly distributed PMF sections. In addition, the lengths of their PMF sections lie within 20% standard deviation of the mean emulator length. Those emulators with PMD statistics that did not approach the theoretical distributions had limited numbers of randomly distributed PMF sections and mode coupling. Results also show that even when an emulator has high random mode coupling and several numbers of randomly distributed PMFs, its PMD statistics deviates away from expected theoretical distributions in the presence of polarization dependent loss (PDL). The emulators showed that the background autocorrelation function (BACF) approaches zero with increasing number of randomly mode coupled fibre sections. A zero BACF signifies that an emulator has large numbers of randomly distributed PMF sections and its presence means the opposite. The availability of SO-PMD in the emulators made the autocorrelation function (ACF) x asymmetric. In the absence of SO-PMD the ACF for a PMD emulator is symmetric. SO-PMD has no effect on the BACF. Polarization-optical time domain reflectometry (P-OTDR) measurements have shown that certain fibre sections along fibre link lengths have higher FO-PMD (HiFO-PMD) than other sections. This study investigates the impact of a HiFO-PMD section on the overall FO- and SO-PMD, the output state of polarization (SOP) and system performance on deployed fibres (through emulation). Results show that when the wavelength-independent FO-PMD vector of the HiFO-PMD section is greater than the FO-PMD contributions from the rest of the fibre link, the mean FO-PMD of the entire link is biased towards that of the HiFO-PMD section and the SO-PMD increases (β ≠ 0o or 180o) or remains fixed (β = 0o or 180o) depending on the coupling angle β between the HiFO-PMD section and the rest of the fibre link. In addition, the FO-PMD statistics deviates away from the theoretical Maxwellian distribution. However, experimental results show that the HiFO-PMD section has negligible influence on the SOPMD statistical distribution. An increase in the amount of FO-PMD on a HiFO-PMD section reduces the output SOP spread to a given minimum, in this study the minimum was reached when the HiFO-PMD ≥ 35 ps. However, the outcome of the output SOP spread depends on the location of the HiFO-PMD section along the fibre link length. It was found that when the HiFO-PMD section introduces SO-PMD, the bit error rate (BER) is much higher compared to when it does not introduce SO-PMD.
- Full Text:
- Date Issued: 2009
- Authors: Musara, Vitalis
- Date: 2009
- Subjects: Optical communications , Fiber optics , Polarization (Light)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10519 , http://hdl.handle.net/10948/1138 , Optical communications , Fiber optics , Polarization (Light)
- Description: In this study, focus is centred on the measurement and emulation of first-order (FO-) and second-order (SO-) polarization mode dispersion (PMD). PMD has deleterious effects on the performance of high speed optical transmission network systems from 10 Gb/s and above. The first step was characterising deployed fibres for PMD and monitoring the state of polarization (SOP) light experiences as it propagates through the fibre. The PMD and SOP changes in deployed fibres were stochastic due to varying intrinsic and extrinsic perturbation changes. To fully understand the PMD phenomenon in terms of measurement accuracy, its complex behaviour, its implications, mitigation and compensation, PMD emulation is crucial. This thesis presents emulator designs which fall into different emulator categories. The key to these designs were the PMD equations and background on the PMD phenomenon. The cross product from the concatenation equation was applied in order to determine the coupling angle β (between 0o and 180o) that results in the SO-PMD of the emulator designs to be either adjustable or fixed. The digital delay line (DDL) or single polarization maintaining fibre (PMF) section was used to give a certain amount of FO-PMD but negligible SO-PMD. PMF sections (birefringent sections) were concatenated together to ensure FO- and SO-PMD coexist, emulating deployed fibres. FO- and SO-PMD can be controlled by altering mode coupling (coupling angles) and birefringence distribution. Emulators with PMD statistics approaching the theoretical distributions had high random coupling and several numbers of randomly distributed PMF sections. In addition, the lengths of their PMF sections lie within 20% standard deviation of the mean emulator length. Those emulators with PMD statistics that did not approach the theoretical distributions had limited numbers of randomly distributed PMF sections and mode coupling. Results also show that even when an emulator has high random mode coupling and several numbers of randomly distributed PMFs, its PMD statistics deviates away from expected theoretical distributions in the presence of polarization dependent loss (PDL). The emulators showed that the background autocorrelation function (BACF) approaches zero with increasing number of randomly mode coupled fibre sections. A zero BACF signifies that an emulator has large numbers of randomly distributed PMF sections and its presence means the opposite. The availability of SO-PMD in the emulators made the autocorrelation function (ACF) x asymmetric. In the absence of SO-PMD the ACF for a PMD emulator is symmetric. SO-PMD has no effect on the BACF. Polarization-optical time domain reflectometry (P-OTDR) measurements have shown that certain fibre sections along fibre link lengths have higher FO-PMD (HiFO-PMD) than other sections. This study investigates the impact of a HiFO-PMD section on the overall FO- and SO-PMD, the output state of polarization (SOP) and system performance on deployed fibres (through emulation). Results show that when the wavelength-independent FO-PMD vector of the HiFO-PMD section is greater than the FO-PMD contributions from the rest of the fibre link, the mean FO-PMD of the entire link is biased towards that of the HiFO-PMD section and the SO-PMD increases (β ≠ 0o or 180o) or remains fixed (β = 0o or 180o) depending on the coupling angle β between the HiFO-PMD section and the rest of the fibre link. In addition, the FO-PMD statistics deviates away from the theoretical Maxwellian distribution. However, experimental results show that the HiFO-PMD section has negligible influence on the SOPMD statistical distribution. An increase in the amount of FO-PMD on a HiFO-PMD section reduces the output SOP spread to a given minimum, in this study the minimum was reached when the HiFO-PMD ≥ 35 ps. However, the outcome of the output SOP spread depends on the location of the HiFO-PMD section along the fibre link length. It was found that when the HiFO-PMD section introduces SO-PMD, the bit error rate (BER) is much higher compared to when it does not introduce SO-PMD.
- Full Text:
- Date Issued: 2009