Ways of seeing over time: the construction and imagination of ‘historic separation’ in Israeli and Palestinian cultures
- Authors: Butler, Nina Melissa
- Date: 2016
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/474 , vital:19962
- Description: There exists an international consensus that Palestinian and Israeli societies are ceaselessly and essentially acrimonious. This thesis argues that the conceptualisation of ‘historic separation’ in Palestine/Israel is supported and nourished by national narratives that follow classic historicism and a linear trajectory of essentialised culture progressing over time. Given these patterns in historiography and cultural expressions, conceptualisations of the future are argued to be dominated by the ‘overdetermined’ and ‘sacralised’ pasts that arrest the ability to conceive of alternative horizons. These national narratives are analysed borrowing from the theorisation of Edward Said on hegemonic culture, and Ranjit Guha’s Subaltern critique of historicism. Zionism is argued to function as a cultural hegemony that operates in a mercurial, selfsustaining and vibrant manner that has the effect of what this thesis terms ‘centrifugal magnetism’ on discourse in the region. Palestinian national narratives are held to be in tangential relation to Zionism (a classic colonial master-narrative), thus entering into a ‘terrible embrace’ of destructive colonial/postcolonial repetition that tends towards violent conflict and the discrimination of minorities. This thesis then proposes a ‘way out’ of this historiographical pattern that is argued to tangibly inform the cultural fabric of the region. By drawing on the later works of Mahmoud Darwish, Mustaffa Hallaj and Said, it is proposed that there are traces of a notion of self and community that can be described as postnational. This demands a reconstruction of narratives of the past in the region in a pluralistic fashion that is based upon shared exilic identity in flux over what Darwish termed an ‘open historical space’. Crucially, this alternative postnational narrative opens up conceptualisations of the future and is founded upon a renewed disposition to temporality. This thesis thus concludes by proposing that an understanding of temporality as ‘ecstatic’ and essential to being (Martin Heidegger) should be included as a crucial consideration for the end to conflict and the attainment of just and equitable futures.
- Full Text:
- Date Issued: 2016
- Authors: Butler, Nina Melissa
- Date: 2016
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/474 , vital:19962
- Description: There exists an international consensus that Palestinian and Israeli societies are ceaselessly and essentially acrimonious. This thesis argues that the conceptualisation of ‘historic separation’ in Palestine/Israel is supported and nourished by national narratives that follow classic historicism and a linear trajectory of essentialised culture progressing over time. Given these patterns in historiography and cultural expressions, conceptualisations of the future are argued to be dominated by the ‘overdetermined’ and ‘sacralised’ pasts that arrest the ability to conceive of alternative horizons. These national narratives are analysed borrowing from the theorisation of Edward Said on hegemonic culture, and Ranjit Guha’s Subaltern critique of historicism. Zionism is argued to function as a cultural hegemony that operates in a mercurial, selfsustaining and vibrant manner that has the effect of what this thesis terms ‘centrifugal magnetism’ on discourse in the region. Palestinian national narratives are held to be in tangential relation to Zionism (a classic colonial master-narrative), thus entering into a ‘terrible embrace’ of destructive colonial/postcolonial repetition that tends towards violent conflict and the discrimination of minorities. This thesis then proposes a ‘way out’ of this historiographical pattern that is argued to tangibly inform the cultural fabric of the region. By drawing on the later works of Mahmoud Darwish, Mustaffa Hallaj and Said, it is proposed that there are traces of a notion of self and community that can be described as postnational. This demands a reconstruction of narratives of the past in the region in a pluralistic fashion that is based upon shared exilic identity in flux over what Darwish termed an ‘open historical space’. Crucially, this alternative postnational narrative opens up conceptualisations of the future and is founded upon a renewed disposition to temporality. This thesis thus concludes by proposing that an understanding of temporality as ‘ecstatic’ and essential to being (Martin Heidegger) should be included as a crucial consideration for the end to conflict and the attainment of just and equitable futures.
- Full Text:
- Date Issued: 2016
Parents' perceptions of their adolescent children's internet use
- Authors: Butler, Zoe Ann
- Date: 2016
- Subjects: Parent and child -- South Africa , Internet users -- South Africa , Cyberbullying -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/7134 , vital:21246
- Description: Parents’ perceptions of their adolescent children’s Internet use significantly influences the parental mediation strategies they choose to use with their children. The motivation for this explorative research study was to understand the impact of psychological and social influences on users of the Internet in South Africa. Both locally and internationally, there is a focus on the use of digital Internet devices to facilitate education. Access of South Africans to the Internet, whether for social or educational use does not exist in a vacuum, exempt from the bidirectional forces of the individual and the environment they use the Internet in, whether it is family or academic. This study firstly focusses on how parents perceive their adolescent children’s Internet use, and secondly, how they parent their children’s use of the Internet. The common topics and themes that emerged from this study allow for the development and provision of professional services that individuals, couples, families, and groups require for the use of, or exposure to the Internet. This study uses an explorative-descriptive qualitative research design with an interpretive paradigm and snowball sampling. The qualitative research design focussed on the concepts of self-reflexivity, context, and thick description while utilizing multivocality of 1) international and South African research on cyber citizenship, including cyberbullying, cyber harassment, and legal consequences, with 2) psychological aspects of the psychosocial developmental challenges of adolescents from the iGeneration including the benefits, risks, and dangers of using the Internet, and 3) qualitative data collected from semi-structured interviews with parents from Generation X who are raising and educating a generation of children on the other side of the Digital Divide. Tracy’s 8 ‘Big-Tent’ criteria for guiding excellence in qualitative research and Tesch’s model of content analysis was used during the content analysis process. Themes and sub-themes that emerged from the analysis of the participants’ narratives included 1) experiences: positive and negative, 2) observations: behavioural changes and gender differences, 3) parenting methods: parental interaction, rules, and limits, 4) concerns: risks, and 5) opinions: personal views. This research study provides a thick description of South African and international literature and combines the literature with the voices of the participants and the researcher to produce discussions based on the findings of this qualitative study. Conclusions, recommendations, and limitations of this study informed future research on cyber citizenship by providing a detailed understanding of the context of South African parents and children, the psychosocial developmental challenges of adolescents and, how educational programmes can be best created to effectively impact on the generations of parents, teachers and children in South Africa.
- Full Text:
- Date Issued: 2016
- Authors: Butler, Zoe Ann
- Date: 2016
- Subjects: Parent and child -- South Africa , Internet users -- South Africa , Cyberbullying -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/7134 , vital:21246
- Description: Parents’ perceptions of their adolescent children’s Internet use significantly influences the parental mediation strategies they choose to use with their children. The motivation for this explorative research study was to understand the impact of psychological and social influences on users of the Internet in South Africa. Both locally and internationally, there is a focus on the use of digital Internet devices to facilitate education. Access of South Africans to the Internet, whether for social or educational use does not exist in a vacuum, exempt from the bidirectional forces of the individual and the environment they use the Internet in, whether it is family or academic. This study firstly focusses on how parents perceive their adolescent children’s Internet use, and secondly, how they parent their children’s use of the Internet. The common topics and themes that emerged from this study allow for the development and provision of professional services that individuals, couples, families, and groups require for the use of, or exposure to the Internet. This study uses an explorative-descriptive qualitative research design with an interpretive paradigm and snowball sampling. The qualitative research design focussed on the concepts of self-reflexivity, context, and thick description while utilizing multivocality of 1) international and South African research on cyber citizenship, including cyberbullying, cyber harassment, and legal consequences, with 2) psychological aspects of the psychosocial developmental challenges of adolescents from the iGeneration including the benefits, risks, and dangers of using the Internet, and 3) qualitative data collected from semi-structured interviews with parents from Generation X who are raising and educating a generation of children on the other side of the Digital Divide. Tracy’s 8 ‘Big-Tent’ criteria for guiding excellence in qualitative research and Tesch’s model of content analysis was used during the content analysis process. Themes and sub-themes that emerged from the analysis of the participants’ narratives included 1) experiences: positive and negative, 2) observations: behavioural changes and gender differences, 3) parenting methods: parental interaction, rules, and limits, 4) concerns: risks, and 5) opinions: personal views. This research study provides a thick description of South African and international literature and combines the literature with the voices of the participants and the researcher to produce discussions based on the findings of this qualitative study. Conclusions, recommendations, and limitations of this study informed future research on cyber citizenship by providing a detailed understanding of the context of South African parents and children, the psychosocial developmental challenges of adolescents and, how educational programmes can be best created to effectively impact on the generations of parents, teachers and children in South Africa.
- Full Text:
- Date Issued: 2016
Parents' perceptions of their adolescent children's internet use
- Authors: Butler, Zoe Ann
- Date: 2016
- Subjects: Parent and child -- South Africa , Internet users -- South Africa , Cyberbullying -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4575 , vital:20619
- Description: Parents’ perceptions of their adolescent children’s Internet use significantly influences the parental mediation strategies they choose to use with their children. The motivation for this explorative research study was to understand the impact of psychological and social influences on users of the Internet in South Africa. Both locally and internationally, there is a focus on the use of digital Internet devices to facilitate education. Access of South Africans to the Internet, whether for social or educational use does not exist in a vacuum, exempt from the bidirectional forces of the individual and the environment they use the Internet in, whether it is family or academic. This study firstly focusses on how parents perceive their adolescent children’s Internet use, and secondly, how they parent their children’s use of the Internet. The common topics and themes that emerged from this study allow for the development and provision of professional services that individuals, couples, families, and groups require for the use of, or exposure to the Internet. This study uses an explorative-descriptive qualitative research design with an interpretive paradigm and snowball sampling. The qualitative research design focussed on the concepts of self-reflexivity, context, and thick description while utilizing multivocality of 1) international and South African research on cyber citizenship, including cyberbullying, cyber harassment, and legal consequences, with 2) psychological aspects of the psychosocial developmental challenges of adolescents from the iGeneration including the benefits, risks, and dangers of using the Internet, and 3) qualitative data collected from semi-structured interviews with parents from Generation X who are raising and educating a generation of children on the other side of the Digital Divide. Tracy’s 8 ‘Big-Tent’ criteria for guiding excellence in qualitative research and Tesch’s model of content analysis was used during the content analysis process. Themes and sub-themes that emerged from the analysis of the participants’ narratives included 1) experiences: positive and negative, 2) observations: behavioural changes and gender differences, 3) parenting methods: parental interaction, rules, and limits, 4) concerns: risks, and 5) opinions: personal views. This research study provides a thick description of South African and international literature and combines the literature with the voices of the participants and the researcher to produce discussions based on the findings of this qualitative study. Conclusions, recommendations, and limitations of this study informed future research on cyber citizenship by providing a detailed understanding of the context of South African parents and children, the psychosocial developmental challenges of adolescents and, how educational programmes can be best created to effectively impact on the generations of parents, teachers and children in South Africa.
- Full Text:
- Date Issued: 2016
- Authors: Butler, Zoe Ann
- Date: 2016
- Subjects: Parent and child -- South Africa , Internet users -- South Africa , Cyberbullying -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4575 , vital:20619
- Description: Parents’ perceptions of their adolescent children’s Internet use significantly influences the parental mediation strategies they choose to use with their children. The motivation for this explorative research study was to understand the impact of psychological and social influences on users of the Internet in South Africa. Both locally and internationally, there is a focus on the use of digital Internet devices to facilitate education. Access of South Africans to the Internet, whether for social or educational use does not exist in a vacuum, exempt from the bidirectional forces of the individual and the environment they use the Internet in, whether it is family or academic. This study firstly focusses on how parents perceive their adolescent children’s Internet use, and secondly, how they parent their children’s use of the Internet. The common topics and themes that emerged from this study allow for the development and provision of professional services that individuals, couples, families, and groups require for the use of, or exposure to the Internet. This study uses an explorative-descriptive qualitative research design with an interpretive paradigm and snowball sampling. The qualitative research design focussed on the concepts of self-reflexivity, context, and thick description while utilizing multivocality of 1) international and South African research on cyber citizenship, including cyberbullying, cyber harassment, and legal consequences, with 2) psychological aspects of the psychosocial developmental challenges of adolescents from the iGeneration including the benefits, risks, and dangers of using the Internet, and 3) qualitative data collected from semi-structured interviews with parents from Generation X who are raising and educating a generation of children on the other side of the Digital Divide. Tracy’s 8 ‘Big-Tent’ criteria for guiding excellence in qualitative research and Tesch’s model of content analysis was used during the content analysis process. Themes and sub-themes that emerged from the analysis of the participants’ narratives included 1) experiences: positive and negative, 2) observations: behavioural changes and gender differences, 3) parenting methods: parental interaction, rules, and limits, 4) concerns: risks, and 5) opinions: personal views. This research study provides a thick description of South African and international literature and combines the literature with the voices of the participants and the researcher to produce discussions based on the findings of this qualitative study. Conclusions, recommendations, and limitations of this study informed future research on cyber citizenship by providing a detailed understanding of the context of South African parents and children, the psychosocial developmental challenges of adolescents and, how educational programmes can be best created to effectively impact on the generations of parents, teachers and children in South Africa.
- Full Text:
- Date Issued: 2016
A qualitative study: educator-targeted bullying by learners in a high school in Port Elizabeth
- Authors: Campher, Roelof Petrus
- Date: 2016
- Subjects: Bullying in schools -- South Africa -- Port Elizabeth , Educators -- Abuse of -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/4709 , vital:20655
- Description: This study explores the phenomenon of educator targeted-bullying (ETB) by learners as an educational problem in terms of the incidence, frequency, severity and the impact on effective teaching and learning in classrooms. Abuse or bullying in schools usually happens amongst learners or to learners targeted by educators. However, the phenomenon of educator abuse by learners is escalating, internationally as well as nationally, and is experienced by many educators, especially by those teaching in secondary schools. An extensive literature review on numerous research national and international studies reports on the fact that the bullying of educators in all its forms, including physical, verbal, emotional and cyber bullying, impacts negatively on the emotional and psychological well-being of educators who are also stressed by other work demands, resulting in ineffective teaching and learning experiences in schools. The over-arching purpose of this local study was to determine the impact of ETB by learners on the effectiveness of teaching and learning in classrooms. In addition, other aspects of ETB were examined, namely the types of bullying, its severity and frequency, and the emotional and psychological effects on educators’ general well-being as victims. The study was conducted in a private high school in the Nelson Mandela Metropolitan area, Eastern Cape, South Africa. A qualitative methodology was used and all the educators employed at this particular school took part in the study. Convenience sampling was thus applied in the selection of the participants and questionnaires and written narratives were used as data gathering instruments. Twelve educators completed questionnaires to gather information-rich qualitative data to investigate the abovementioned aspects of this study. Four educators wrote narratives on their experiences of ETB by learners in this school context. The results of this research provided valuable evidence that ETB by learners in this school has a distressing impact on the educators and their psychological well-being, impairing teaching quality and learning outcomes in classrooms and, ultimately, with adverse educational consequences for all learners. The theoretical framework for this study was based on the ecological systems theory of the developmental psychologist and theorist, Urie Bronfenbrenner. Bronfenbrenner (1979) suggested that the process of human development is shaped and moulded by a person’s v environment and all the people and institutions that play a role in that environment. In my view, this theory may explain to some extent why some children are moulded and shaped as bullies as a result of the child’s exposure to and interaction with his/her environment. The main findings of this study include the fact that ETB is a serious phenomenon that an increasing number of educators are exposed to. It also appears that the incidences are becoming more severe and involve serious physical threats and bodily harm. Educators are also exposed to ETB on a regular basis, with many educators being bullied on a daily basis. It is clear that verbal abuse is the most prominent form of ETB leading to emotional damage, feelings of incompetence and reduced motivation to teach with innovation and enthusiasm. This in turn leads to the very concerning fact that ETB negatively affects successful teaching and learning in classrooms, adding more problems to an already embattled education system. Participants also provided some guidelines to reduce and possibly prevent ETB by learners. In doing so, these data can hopefully be used in the formulation of anti-bullying programmes for educators, which can result in safer working environments and more effective teaching and learning for learners.
- Full Text:
- Date Issued: 2016
- Authors: Campher, Roelof Petrus
- Date: 2016
- Subjects: Bullying in schools -- South Africa -- Port Elizabeth , Educators -- Abuse of -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/4709 , vital:20655
- Description: This study explores the phenomenon of educator targeted-bullying (ETB) by learners as an educational problem in terms of the incidence, frequency, severity and the impact on effective teaching and learning in classrooms. Abuse or bullying in schools usually happens amongst learners or to learners targeted by educators. However, the phenomenon of educator abuse by learners is escalating, internationally as well as nationally, and is experienced by many educators, especially by those teaching in secondary schools. An extensive literature review on numerous research national and international studies reports on the fact that the bullying of educators in all its forms, including physical, verbal, emotional and cyber bullying, impacts negatively on the emotional and psychological well-being of educators who are also stressed by other work demands, resulting in ineffective teaching and learning experiences in schools. The over-arching purpose of this local study was to determine the impact of ETB by learners on the effectiveness of teaching and learning in classrooms. In addition, other aspects of ETB were examined, namely the types of bullying, its severity and frequency, and the emotional and psychological effects on educators’ general well-being as victims. The study was conducted in a private high school in the Nelson Mandela Metropolitan area, Eastern Cape, South Africa. A qualitative methodology was used and all the educators employed at this particular school took part in the study. Convenience sampling was thus applied in the selection of the participants and questionnaires and written narratives were used as data gathering instruments. Twelve educators completed questionnaires to gather information-rich qualitative data to investigate the abovementioned aspects of this study. Four educators wrote narratives on their experiences of ETB by learners in this school context. The results of this research provided valuable evidence that ETB by learners in this school has a distressing impact on the educators and their psychological well-being, impairing teaching quality and learning outcomes in classrooms and, ultimately, with adverse educational consequences for all learners. The theoretical framework for this study was based on the ecological systems theory of the developmental psychologist and theorist, Urie Bronfenbrenner. Bronfenbrenner (1979) suggested that the process of human development is shaped and moulded by a person’s v environment and all the people and institutions that play a role in that environment. In my view, this theory may explain to some extent why some children are moulded and shaped as bullies as a result of the child’s exposure to and interaction with his/her environment. The main findings of this study include the fact that ETB is a serious phenomenon that an increasing number of educators are exposed to. It also appears that the incidences are becoming more severe and involve serious physical threats and bodily harm. Educators are also exposed to ETB on a regular basis, with many educators being bullied on a daily basis. It is clear that verbal abuse is the most prominent form of ETB leading to emotional damage, feelings of incompetence and reduced motivation to teach with innovation and enthusiasm. This in turn leads to the very concerning fact that ETB negatively affects successful teaching and learning in classrooms, adding more problems to an already embattled education system. Participants also provided some guidelines to reduce and possibly prevent ETB by learners. In doing so, these data can hopefully be used in the formulation of anti-bullying programmes for educators, which can result in safer working environments and more effective teaching and learning for learners.
- Full Text:
- Date Issued: 2016
Measures of success of small and medium-sized family and non-family-owned businesses in the Eastern Cape
- Authors: Carelsen, Mispah
- Date: 2016
- Subjects: Success in business -- South Africa -- Eastern Cape , Small business -- South Africa -- Eastern Cape , Family-owned business enterprises -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/3479 , vital:20434
- Description: Small and medium-sized enterprises (SMEs) are recognised internationally and in South Africa as a critical component of the economic development of a country as a result of their contribution to job creation, alleviation of poverty, sustainability and innovation. Furthermore, the majority of SMEs are also family-owned and play an increasingly important role in the South African economy, making up approximately 84 per cent of businesses in the country. Despite the critical role that family and non-family SMEs play in economic development, they are still plagued with high failure rates and unique challenges that make it difficult for them to survive. These challenges include, amongst others, regulatory burdens, restrictive labour policies, a lack of access to finance, markets and technology, as well as an overwhelmingly constant emphasis on survival. As a result of the added dynamic of family relationships within family-owned SMEs, they face additional challenges such as conflict between family members and inadequate succession planning. Focus is often placed on the factors leading to failure, but little is known about success-aiding behaviours that could reduce the high failure rate and improve the success rate of these businesses. As a result, it is important to examine what determines success and how it is measured. Success can be defined as the attainment of goals, therefore the achievement of goals plays a critical role in the success of the business.
- Full Text:
- Date Issued: 2016
- Authors: Carelsen, Mispah
- Date: 2016
- Subjects: Success in business -- South Africa -- Eastern Cape , Small business -- South Africa -- Eastern Cape , Family-owned business enterprises -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/3479 , vital:20434
- Description: Small and medium-sized enterprises (SMEs) are recognised internationally and in South Africa as a critical component of the economic development of a country as a result of their contribution to job creation, alleviation of poverty, sustainability and innovation. Furthermore, the majority of SMEs are also family-owned and play an increasingly important role in the South African economy, making up approximately 84 per cent of businesses in the country. Despite the critical role that family and non-family SMEs play in economic development, they are still plagued with high failure rates and unique challenges that make it difficult for them to survive. These challenges include, amongst others, regulatory burdens, restrictive labour policies, a lack of access to finance, markets and technology, as well as an overwhelmingly constant emphasis on survival. As a result of the added dynamic of family relationships within family-owned SMEs, they face additional challenges such as conflict between family members and inadequate succession planning. Focus is often placed on the factors leading to failure, but little is known about success-aiding behaviours that could reduce the high failure rate and improve the success rate of these businesses. As a result, it is important to examine what determines success and how it is measured. Success can be defined as the attainment of goals, therefore the achievement of goals plays a critical role in the success of the business.
- Full Text:
- Date Issued: 2016
Foraging ecology of the gentoo penguin, pygoscelis papua, at Marion Island
- Authors: Carpenter-Kling, Tegan
- Date: 2016
- Subjects: Gentoo penguin -- Food
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/4912 , vital:20766
- Description: The distribution and subsequent availability of marine predators’ prey is highly variable and is linked to fluctuating oceanographic parameters. It is well documented that annual breeding success of seabirds is related to the temporal availability of prey. Knowledge of a seabird’s diet and at sea distribution is therefore critical in deducing the effect of a fluctuating environment on a seabirds’ population and, furthermore, to understand seabirds role in the environment. The gentoo penguin population at sub-Antarctic Marion Island experienced a decline of 52% between 1994 and 2012. It has been speculated that long term changes in the local marine environment, due to a southward shift of the sub-Antarctic Front (SAF), and subsequent changes in prey availability is the ultimate causal factor. Therefore, this thesis investigates the temporal variation in the diet these birds over three years, through the use of stomach content samples. It then investigates whether the composition of the diet has changed over the long term (approximately 18 years). Additionally, the at sea distribution of these birds was investigated using temperature-depth recorders (TDRs) and global positioning system (GPS) devices. This study represents the first to investigate variation in the diet over three years and over the long term. It is also the first study to track these birds fine scale movement. Over three years, the diet exhibited a high degree of variability. The birds primarily foraged on the fish, Lepidonotothen larseni and the crustaceans, Nauticaris marionis and Euphausia vallentiniy. Over three years, L. larseni became increasingly more important during the breeding season. This was attributed to an increase in availability of these fish during this time, as this time corresponded to the transition of these fish from the larval pelagic phase to the benthic adult phase. Furthermore, the proportions of N. marionis and E. vallentini in the diet varied significantly among years. This variation is possibly a result of the highly variable latitudinal position of the SAF. The diet changed over the long term. There was significantly less N. marionis and more E. vallentini in the diet during more recent years. The long term southward shift of the SAF is considered to be a leading cause of these significant changes in the diet. The shallow inter-island shelf between Marion and Prince Edward Island was an important foraging area possibly due to predictable prey resources. In addition, these birds exhibited an important and possibly unique foraging strategy. They performed short self-maintenance trips where after they return to land to roost for the night. The following day these trips were followed by a longer foraging trip that was followed by chick provisioning. This strategy is unique among seabirds longer trips are associated with self-maintenance and not chick provisioning. This study has provided important knowledge of the foraging ecology of the gentoo penguin at sub-Antarctic Marion Island. It highlights the necessity for continuation of diet and tracking studies of these birds if we are to fully understand the ultimate factors that are causing the decline in their breeding success and population numbers.
- Full Text:
- Date Issued: 2016
- Authors: Carpenter-Kling, Tegan
- Date: 2016
- Subjects: Gentoo penguin -- Food
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/4912 , vital:20766
- Description: The distribution and subsequent availability of marine predators’ prey is highly variable and is linked to fluctuating oceanographic parameters. It is well documented that annual breeding success of seabirds is related to the temporal availability of prey. Knowledge of a seabird’s diet and at sea distribution is therefore critical in deducing the effect of a fluctuating environment on a seabirds’ population and, furthermore, to understand seabirds role in the environment. The gentoo penguin population at sub-Antarctic Marion Island experienced a decline of 52% between 1994 and 2012. It has been speculated that long term changes in the local marine environment, due to a southward shift of the sub-Antarctic Front (SAF), and subsequent changes in prey availability is the ultimate causal factor. Therefore, this thesis investigates the temporal variation in the diet these birds over three years, through the use of stomach content samples. It then investigates whether the composition of the diet has changed over the long term (approximately 18 years). Additionally, the at sea distribution of these birds was investigated using temperature-depth recorders (TDRs) and global positioning system (GPS) devices. This study represents the first to investigate variation in the diet over three years and over the long term. It is also the first study to track these birds fine scale movement. Over three years, the diet exhibited a high degree of variability. The birds primarily foraged on the fish, Lepidonotothen larseni and the crustaceans, Nauticaris marionis and Euphausia vallentiniy. Over three years, L. larseni became increasingly more important during the breeding season. This was attributed to an increase in availability of these fish during this time, as this time corresponded to the transition of these fish from the larval pelagic phase to the benthic adult phase. Furthermore, the proportions of N. marionis and E. vallentini in the diet varied significantly among years. This variation is possibly a result of the highly variable latitudinal position of the SAF. The diet changed over the long term. There was significantly less N. marionis and more E. vallentini in the diet during more recent years. The long term southward shift of the SAF is considered to be a leading cause of these significant changes in the diet. The shallow inter-island shelf between Marion and Prince Edward Island was an important foraging area possibly due to predictable prey resources. In addition, these birds exhibited an important and possibly unique foraging strategy. They performed short self-maintenance trips where after they return to land to roost for the night. The following day these trips were followed by a longer foraging trip that was followed by chick provisioning. This strategy is unique among seabirds longer trips are associated with self-maintenance and not chick provisioning. This study has provided important knowledge of the foraging ecology of the gentoo penguin at sub-Antarctic Marion Island. It highlights the necessity for continuation of diet and tracking studies of these birds if we are to fully understand the ultimate factors that are causing the decline in their breeding success and population numbers.
- Full Text:
- Date Issued: 2016
Higher order modulation formats for high speed optical communication systems with digital signal processing aided receiver
- Chabata, Tichakunda Valentine
- Authors: Chabata, Tichakunda Valentine
- Date: 2016
- Subjects: Optical communications , Modulation (Electronics) , Signal processing
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/4775 , vital:20677
- Description: The drastic increase in the number of internet users and the general convergence of all other communication systems into an optical system have brought a sharp rise in demand for bandwidth and calls for high capacity transmission networks. Large unamplified transmission reach is another contributor in reducing deployment costs of an optical communication system. Spectrally efficient modulation formats are suggested as a solution to overcome the problems associated with limited channels and bandwidth of dense wavelength division multiplexing (DWDM) optical communication systems. Higher order modulation formats which are considered to be spectrally efficient and can increase the transmission capacity by transmitting more information in the amplitude, phase, polarization or a combination of all was studied. Different detection technologies are to be implemented to suit a particular higher order modulation format. In this research multilevel modulation formats, different detection technologies and a digital signal processing aided receiver were studied in a practical optical transmission system. The work in this thesis started with the implementation of the traditional amplitude shift keying (ASK) modulation and a differential phase shift keying (DPSK) modulation systems as they form the basic building block in the design of higher order modulation formats. Results obtained from using virtual photonics instruments (VPI)simulation software, receiver sensitivity for 10Gbpsnon-return-to-zero (NRZ), amplitude phase shift keying (ASK) and DPSK signals were measured to be -22.7 dBm and -22.0 dBm respectively. Performance comparison for the two modulation formats were done over different transmission distances. ASK also known as On-Off keying (OOK) performed better for shorter lengths whereas DPSK performed better for longer lengths of up to90km.Experimental results on a 10 Gbps NRZ- ASK signal gave a receiver sensitivity of -21.1 dBm from digital signal processing (DSP) aided receiver against -19.8 dBm from the commercial bit error ratio tester (BERT) yielding a small difference of 1.3 dB hence validating the reliability and accuracy of the digital signal processing (DSP) assisted receiver. Traditional direct detection scheme and coherent detection scheme performances were evaluated again on a 10 Gbps NRZ ASK signal. Coherent detection that can achieve a large unamplified transmission reach and has a higher passive optical splitting ratio was first evaluated using the VPI simulation software. Simulation results gave a receiver sensitivity of -30.4 dBm forcoherent detection and -18.3 dBm for direct detection, yielding a gain in receiver sensitivity of 12.1 dB. The complex coherently detected signal, from the experimental setup gave a receiver sensitivity of -20.6 dBm with a gain in receiver sensitivity of 3.5 dBm with respect to direct detection. A multilevel pulse amplitude modulation (4-PAM) that doubles the data rate per channel from10 Gbps to 20 Gbps by transmitting more information in the amplitude of the carrier signal was implemented. This was achieved by modulating the optical amplitude with an electrical four level amplitude shift keyed (ASK) signal. A receiver consisting of a single photodiode, three decision circuits and a decoding logic circuit was used to receive and extract the original transmitted data. A DSP aided receiver was used to evaluate the link performance. A receiver sensitivity of -12.8 dBm is attained with a dispersion penalty of about 7.2 dB after transmission through 25 km of G.652 fibre.
- Full Text:
- Date Issued: 2016
- Authors: Chabata, Tichakunda Valentine
- Date: 2016
- Subjects: Optical communications , Modulation (Electronics) , Signal processing
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/4775 , vital:20677
- Description: The drastic increase in the number of internet users and the general convergence of all other communication systems into an optical system have brought a sharp rise in demand for bandwidth and calls for high capacity transmission networks. Large unamplified transmission reach is another contributor in reducing deployment costs of an optical communication system. Spectrally efficient modulation formats are suggested as a solution to overcome the problems associated with limited channels and bandwidth of dense wavelength division multiplexing (DWDM) optical communication systems. Higher order modulation formats which are considered to be spectrally efficient and can increase the transmission capacity by transmitting more information in the amplitude, phase, polarization or a combination of all was studied. Different detection technologies are to be implemented to suit a particular higher order modulation format. In this research multilevel modulation formats, different detection technologies and a digital signal processing aided receiver were studied in a practical optical transmission system. The work in this thesis started with the implementation of the traditional amplitude shift keying (ASK) modulation and a differential phase shift keying (DPSK) modulation systems as they form the basic building block in the design of higher order modulation formats. Results obtained from using virtual photonics instruments (VPI)simulation software, receiver sensitivity for 10Gbpsnon-return-to-zero (NRZ), amplitude phase shift keying (ASK) and DPSK signals were measured to be -22.7 dBm and -22.0 dBm respectively. Performance comparison for the two modulation formats were done over different transmission distances. ASK also known as On-Off keying (OOK) performed better for shorter lengths whereas DPSK performed better for longer lengths of up to90km.Experimental results on a 10 Gbps NRZ- ASK signal gave a receiver sensitivity of -21.1 dBm from digital signal processing (DSP) aided receiver against -19.8 dBm from the commercial bit error ratio tester (BERT) yielding a small difference of 1.3 dB hence validating the reliability and accuracy of the digital signal processing (DSP) assisted receiver. Traditional direct detection scheme and coherent detection scheme performances were evaluated again on a 10 Gbps NRZ ASK signal. Coherent detection that can achieve a large unamplified transmission reach and has a higher passive optical splitting ratio was first evaluated using the VPI simulation software. Simulation results gave a receiver sensitivity of -30.4 dBm forcoherent detection and -18.3 dBm for direct detection, yielding a gain in receiver sensitivity of 12.1 dB. The complex coherently detected signal, from the experimental setup gave a receiver sensitivity of -20.6 dBm with a gain in receiver sensitivity of 3.5 dBm with respect to direct detection. A multilevel pulse amplitude modulation (4-PAM) that doubles the data rate per channel from10 Gbps to 20 Gbps by transmitting more information in the amplitude of the carrier signal was implemented. This was achieved by modulating the optical amplitude with an electrical four level amplitude shift keyed (ASK) signal. A receiver consisting of a single photodiode, three decision circuits and a decoding logic circuit was used to receive and extract the original transmitted data. A DSP aided receiver was used to evaluate the link performance. A receiver sensitivity of -12.8 dBm is attained with a dispersion penalty of about 7.2 dB after transmission through 25 km of G.652 fibre.
- Full Text:
- Date Issued: 2016
Historical perspectives and future directions for access to land, water and related ecosystem services in the Lower Sundays River Valley, South Africa: implications for human well being
- Authors: Chadzingwa, Karabo
- Date: 2016
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/442 , vital:19959
- Description: The legacy of South Africa’s history has facilitated unequal access to land and water resources. In the Lower Sundays River Valley (LSRV), a predominantly commercial farming area, differential access to land and water has impacted aspects of ecosystem service access and human well‐being for disenfranchised families over time. Despite the social, political and economic reform efforts in the past two decades, severe inertia towards efforts attempting to increase equitable access to land and water has been experienced. As a result, communities have mobilized and claimed their land from the government through the land restitution process. Based on a mixed‐methods approach, this research explores the ways in which access to land and water over time has influenced current levels of human well‐being among disenfranchised families. Provisioning and cultural ecosystem services were identified as key areas of loss as a result of forced evictions from land. Freedom of choice was a central and cross‐cutting theme regarding the ability to change levels of human well‐being. Although the loss of ecosystem services associated with land and water had an impact on households, the ecosystem services which are regarded as fundamental to human well‐being do not seem to have been lost. The study recommends the wide use of freedom of choice as an indicator for well‐being in the LSRV, as well as a consideration of subjective, objective and psychological measures of well‐being with regards to natural resources and ecosystem services access. Key agents in fostering desirable pathways toward equity and sustainability in the LSRV are identified with stakeholders as private businesses; inclusive governance; empowered and skilled individuals, as well as NGOs.
- Full Text:
- Date Issued: 2016
- Authors: Chadzingwa, Karabo
- Date: 2016
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/442 , vital:19959
- Description: The legacy of South Africa’s history has facilitated unequal access to land and water resources. In the Lower Sundays River Valley (LSRV), a predominantly commercial farming area, differential access to land and water has impacted aspects of ecosystem service access and human well‐being for disenfranchised families over time. Despite the social, political and economic reform efforts in the past two decades, severe inertia towards efforts attempting to increase equitable access to land and water has been experienced. As a result, communities have mobilized and claimed their land from the government through the land restitution process. Based on a mixed‐methods approach, this research explores the ways in which access to land and water over time has influenced current levels of human well‐being among disenfranchised families. Provisioning and cultural ecosystem services were identified as key areas of loss as a result of forced evictions from land. Freedom of choice was a central and cross‐cutting theme regarding the ability to change levels of human well‐being. Although the loss of ecosystem services associated with land and water had an impact on households, the ecosystem services which are regarded as fundamental to human well‐being do not seem to have been lost. The study recommends the wide use of freedom of choice as an indicator for well‐being in the LSRV, as well as a consideration of subjective, objective and psychological measures of well‐being with regards to natural resources and ecosystem services access. Key agents in fostering desirable pathways toward equity and sustainability in the LSRV are identified with stakeholders as private businesses; inclusive governance; empowered and skilled individuals, as well as NGOs.
- Full Text:
- Date Issued: 2016
The community response to the demarcation of the Merafong Municipality into the North West Province
- Chaphatso, Motswantweng Ephraim
- Authors: Chaphatso, Motswantweng Ephraim
- Date: 2016
- Subjects: Conflict management -- South Africa -- West Rand , Violence -- South Africa -- West Rand
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/3489 , vital:20435
- Description: This study was undertaken to describe how the community responded to the incorporation of the Merafong Municipality into the North West Province. The study examined the protracted conflict in Khutsong as well as why the strategies to end the conflict failed. The study was concerned about latent conflict; how differences are raised; dissatisfaction amongst members of the communities and that power asymmetry is the main driver of emotions leading to aggressive behaviour. Service delivery protests are characterised by violence in South Africa and more often communities turn violent in their engagement with their leaders or council officials. This is because it is believed that violence is the only language that authorities understand and they have nothing to lose as government property gets destroyed. Late invitations of third parties who have regulatory skills (negotiations, mediation, conciliation or judicial processes) when conflicts begin, lead to their escalation. A qualitative research method was chosen for this study. A qualitative case study better explained the phenomenon of interest. It allowed me to collect data from the respondents who were active members of the community through interviews. Twelve members of the community (from politicians, ordinary members, educators and the clergy) were part of the respondents. The report was of the respondents own personal experiences as active members of the community. Collected data from the transcripts was coded. Codes with similar meaning were put together in the same categories and the themes were formed from the categories. The qualitative content analysis method was used to analyse the data. From the analysis, it emerged that there was lack of communication and consultation from the side of the government before the implementation of the 16th Amendment Bill which was aimed at removing the cross border municipalities. The announcement was finally made of the incorporation of the Merafong Municipality into North West Province in 2005. The announcement was met with anger and frustration by the Khutsong Demarcation Forum and the community whose expectations were that the incorporation will not go ahead given the reasons they put forth when they met the government officials in the meetings after the demarcation board had proposed it. Violence was the only option for the community to show that their talks with government officials failed and that they are seriously opposed to the incorporation. That led to a protracted violence in Khutsong until 2009 when the Cross-Boundary Municipalities Laws Repeal and Related Matters Amendment Act of 2009 act was passed to reincorporate the Merafong Municipality back into Gauteng.
- Full Text:
- Date Issued: 2016
- Authors: Chaphatso, Motswantweng Ephraim
- Date: 2016
- Subjects: Conflict management -- South Africa -- West Rand , Violence -- South Africa -- West Rand
- Language: English
- Type: Thesis , Masters , MPhil
- Identifier: http://hdl.handle.net/10948/3489 , vital:20435
- Description: This study was undertaken to describe how the community responded to the incorporation of the Merafong Municipality into the North West Province. The study examined the protracted conflict in Khutsong as well as why the strategies to end the conflict failed. The study was concerned about latent conflict; how differences are raised; dissatisfaction amongst members of the communities and that power asymmetry is the main driver of emotions leading to aggressive behaviour. Service delivery protests are characterised by violence in South Africa and more often communities turn violent in their engagement with their leaders or council officials. This is because it is believed that violence is the only language that authorities understand and they have nothing to lose as government property gets destroyed. Late invitations of third parties who have regulatory skills (negotiations, mediation, conciliation or judicial processes) when conflicts begin, lead to their escalation. A qualitative research method was chosen for this study. A qualitative case study better explained the phenomenon of interest. It allowed me to collect data from the respondents who were active members of the community through interviews. Twelve members of the community (from politicians, ordinary members, educators and the clergy) were part of the respondents. The report was of the respondents own personal experiences as active members of the community. Collected data from the transcripts was coded. Codes with similar meaning were put together in the same categories and the themes were formed from the categories. The qualitative content analysis method was used to analyse the data. From the analysis, it emerged that there was lack of communication and consultation from the side of the government before the implementation of the 16th Amendment Bill which was aimed at removing the cross border municipalities. The announcement was finally made of the incorporation of the Merafong Municipality into North West Province in 2005. The announcement was met with anger and frustration by the Khutsong Demarcation Forum and the community whose expectations were that the incorporation will not go ahead given the reasons they put forth when they met the government officials in the meetings after the demarcation board had proposed it. Violence was the only option for the community to show that their talks with government officials failed and that they are seriously opposed to the incorporation. That led to a protracted violence in Khutsong until 2009 when the Cross-Boundary Municipalities Laws Repeal and Related Matters Amendment Act of 2009 act was passed to reincorporate the Merafong Municipality back into Gauteng.
- Full Text:
- Date Issued: 2016
Predators of aerial insects and riparian cross-boundary trophic dynamics: web-building spiders, dragonflies and damselflies
- Authors: Chari, Lenin Dzibakwe
- Date: 2016
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/55791 , vital:26734
- Description: This thesis characterises the cross-boundary trophic interactions of a relatively small model ecosystem, the Kowie River (Eastern Cape of South Africa), to explore their epistemic implications for systems ecology. Using web-building spiders and odonates (dragonflies and damselflies) as model organisms, I sought to investigate whether the diets of predators of aerial insects could be used to assess the strength of the trophic connectivity between freshwater and terrestrial systems in relation to variables such as stream width, distance from the river and aquatic insect emergence rates and abundances. Predator diet composition was determined by using a combination of diet analysis tools: direct observations of cross-subsidies, naturally-abundant stable (carbon and nitrogen) isotope analysis and fatty acid analysis. I also sought to reveal feeding niches and guilds among riparian aerial predators and investigate how the environment influenced predators’ access to aquatic prey subsidies. As emergent aquatic insect abundances decreased with an increase in distance from the river, and increased with stream width and seasonal changes from winter to summer, stable isotope and fatty acid analyses revealed distinct changes in web-building spider diet composition. Examination of the fatty acid eicosapentaenoic acid, a component commonly used as an indicator of consumer reliance on aquatic nutritional subsidies, showed that aquatic subsidies extended further inland at the wider sections of the river. Spiders and odonates at the wider sections of the Kowie River generally received more subsidies (56 – 70%) than those at the narrower sections (25 – 60%). When terrestrial insect biomass was distinctly low in winter, the benefit of aquatic subsidisation to spiders was relatively lower at the narrower sections of the Kowie River relative to the wide sections. As such, riparian areas adjacent to wide parts of the river were more likely to support larger populations of aerial predators than those at the narrow sections. Apart from the diet changes across time and space, there was evidence of inter-specific niche partitioning in both spiders and odonates, but no differences were observed between males and females of the same species. Results showed odonates of different sizes and hunting strategies had separate dietary niches, hence varied access to aquatic nutritional subsidies. The larger odonate taxa that frequently foraged mid-air had more varied diets and relied less on aquatic emergent insects than the smaller odonates that foraged from perches near the river. There was also evidence of niche partitioning amongst the spiders, as those that built horizontal webs captured more aquatic insects (40 – 78%) than the vertical orb-web builders (20 – 66%). This study showed that the nature and extent of trophic cross-boundary linkages in riparian areas largely depended on the availability of subsidies that varied seasonally and spatially. The width of the stream and seasonal variability emerged as important predictors of emergent insect abundances/biomasses that influenced predator feeding niches. The high mobility of odonates made their reliance on aquatic nutritional subsidies different from the less mobile spiders. The link between the width of the river and the extent of trophic connectivity has implications for riparian area management and definition of riparian buffer zones. However, the variation in diet niches amongst terrestrial consumers makes the results area-specific, and more studies are required that incorporate additional terrestrial predators in other fluvial systems so that we can make some generalizations on the dynamics of riparian trophic cross-boundary links.
- Full Text:
- Date Issued: 2016
- Authors: Chari, Lenin Dzibakwe
- Date: 2016
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/55791 , vital:26734
- Description: This thesis characterises the cross-boundary trophic interactions of a relatively small model ecosystem, the Kowie River (Eastern Cape of South Africa), to explore their epistemic implications for systems ecology. Using web-building spiders and odonates (dragonflies and damselflies) as model organisms, I sought to investigate whether the diets of predators of aerial insects could be used to assess the strength of the trophic connectivity between freshwater and terrestrial systems in relation to variables such as stream width, distance from the river and aquatic insect emergence rates and abundances. Predator diet composition was determined by using a combination of diet analysis tools: direct observations of cross-subsidies, naturally-abundant stable (carbon and nitrogen) isotope analysis and fatty acid analysis. I also sought to reveal feeding niches and guilds among riparian aerial predators and investigate how the environment influenced predators’ access to aquatic prey subsidies. As emergent aquatic insect abundances decreased with an increase in distance from the river, and increased with stream width and seasonal changes from winter to summer, stable isotope and fatty acid analyses revealed distinct changes in web-building spider diet composition. Examination of the fatty acid eicosapentaenoic acid, a component commonly used as an indicator of consumer reliance on aquatic nutritional subsidies, showed that aquatic subsidies extended further inland at the wider sections of the river. Spiders and odonates at the wider sections of the Kowie River generally received more subsidies (56 – 70%) than those at the narrower sections (25 – 60%). When terrestrial insect biomass was distinctly low in winter, the benefit of aquatic subsidisation to spiders was relatively lower at the narrower sections of the Kowie River relative to the wide sections. As such, riparian areas adjacent to wide parts of the river were more likely to support larger populations of aerial predators than those at the narrow sections. Apart from the diet changes across time and space, there was evidence of inter-specific niche partitioning in both spiders and odonates, but no differences were observed between males and females of the same species. Results showed odonates of different sizes and hunting strategies had separate dietary niches, hence varied access to aquatic nutritional subsidies. The larger odonate taxa that frequently foraged mid-air had more varied diets and relied less on aquatic emergent insects than the smaller odonates that foraged from perches near the river. There was also evidence of niche partitioning amongst the spiders, as those that built horizontal webs captured more aquatic insects (40 – 78%) than the vertical orb-web builders (20 – 66%). This study showed that the nature and extent of trophic cross-boundary linkages in riparian areas largely depended on the availability of subsidies that varied seasonally and spatially. The width of the stream and seasonal variability emerged as important predictors of emergent insect abundances/biomasses that influenced predator feeding niches. The high mobility of odonates made their reliance on aquatic nutritional subsidies different from the less mobile spiders. The link between the width of the river and the extent of trophic connectivity has implications for riparian area management and definition of riparian buffer zones. However, the variation in diet niches amongst terrestrial consumers makes the results area-specific, and more studies are required that incorporate additional terrestrial predators in other fluvial systems so that we can make some generalizations on the dynamics of riparian trophic cross-boundary links.
- Full Text:
- Date Issued: 2016
Assessing the vulnerability of resource-poor households to disasters associated with climate variability using remote sensing and GIS techniques in the Nkonkobe Local Municipality, Eastern Cape Province, South Africa
- Authors: Chari, Martin Munashe
- Date: 2016
- Subjects: Climatic changes -- Forecasting Natural resources -- Remote sensing Droughts -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/2425 , vital:27837
- Description: The main objective of the study was to assess the extent to which resource-poor households in selected villages of Nkonkobe Local Municipality in the Eastern Cape Province of South Africa are vulnerable to drought by using an improvised remote sensing and Geographic Information System (GIS)-based mapping approach. The research methodology was comprised of 1) assessment of vulnerability levels and 2) the calculation of established drought assessment indices comprising the Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Water Index (NDWI) from wet-season Landsat images covering a period of 29 years from 1985 to 2014 in order to objectively determine the temporal recurrence of drought in Nkonkobe Local Municipality. Vulnerability of households to drought was determined by using a multi-step GIS-based mapping approach in which 3 components comprising exposure, sensitivity and adaptive capacity were simultaneously analysed and averaged to determine the magnitude of vulnerability. Thereafter, the Analytical Hierarchy Process (AHP) was used to establish weighted contributions of these components to vulnerability. The weights applied to the AHP were obtained from the 2012 - 2017 Nkonkobe Integrated Development Plan (IDP) and perceptions that were solicited from key informants who were judged to be knowledgeable about the subject. A Kruskal-Wallis H test on demographic data for water access revealed that the demographic results are independent of choice of data acquired from different data providers (χ2(2) = 1.26, p = 0.533, with a mean ranked population scores of 7.4 for ECSECC, 6.8 for Quantec and 9.8 for StatsSA). Simple linear regression analysis revealed strong positive correlations between NDWI and NDVI ((r = 0.99609375, R2 = 1, for 1985), 1995 (r = 0.99609375, R2 = 1 for 1995), (r = 0.99609375, R2 = 1 for 2005) and (r = 0.99609375, R2 = 1 for 2014). The regression analysis proved that vegetation condition depends on surface water arising from rainfall. The results indicate that the whole of Nkonkobe Local Municipality is susceptible to drought with villages in south eastern part being most vulnerable to droughts due to high sensitivity and low adaptive capacity.
- Full Text:
- Date Issued: 2016
- Authors: Chari, Martin Munashe
- Date: 2016
- Subjects: Climatic changes -- Forecasting Natural resources -- Remote sensing Droughts -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/2425 , vital:27837
- Description: The main objective of the study was to assess the extent to which resource-poor households in selected villages of Nkonkobe Local Municipality in the Eastern Cape Province of South Africa are vulnerable to drought by using an improvised remote sensing and Geographic Information System (GIS)-based mapping approach. The research methodology was comprised of 1) assessment of vulnerability levels and 2) the calculation of established drought assessment indices comprising the Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Water Index (NDWI) from wet-season Landsat images covering a period of 29 years from 1985 to 2014 in order to objectively determine the temporal recurrence of drought in Nkonkobe Local Municipality. Vulnerability of households to drought was determined by using a multi-step GIS-based mapping approach in which 3 components comprising exposure, sensitivity and adaptive capacity were simultaneously analysed and averaged to determine the magnitude of vulnerability. Thereafter, the Analytical Hierarchy Process (AHP) was used to establish weighted contributions of these components to vulnerability. The weights applied to the AHP were obtained from the 2012 - 2017 Nkonkobe Integrated Development Plan (IDP) and perceptions that were solicited from key informants who were judged to be knowledgeable about the subject. A Kruskal-Wallis H test on demographic data for water access revealed that the demographic results are independent of choice of data acquired from different data providers (χ2(2) = 1.26, p = 0.533, with a mean ranked population scores of 7.4 for ECSECC, 6.8 for Quantec and 9.8 for StatsSA). Simple linear regression analysis revealed strong positive correlations between NDWI and NDVI ((r = 0.99609375, R2 = 1, for 1985), 1995 (r = 0.99609375, R2 = 1 for 1995), (r = 0.99609375, R2 = 1 for 2005) and (r = 0.99609375, R2 = 1 for 2014). The regression analysis proved that vegetation condition depends on surface water arising from rainfall. The results indicate that the whole of Nkonkobe Local Municipality is susceptible to drought with villages in south eastern part being most vulnerable to droughts due to high sensitivity and low adaptive capacity.
- Full Text:
- Date Issued: 2016
Screening of entomopathogenic fungi against citrus mealybug, Plannococcus citri (Hemiptera: Pseudococcidae)
- Chartier Fitzgerald, Veronique, Hill, Martin P, Moore, Sean D, Dames, Joanna F
- Authors: Chartier Fitzgerald, Veronique , Hill, Martin P , Moore, Sean D , Dames, Joanna F
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/407059 , vital:70333 , xlink:href="https://hdl.handle.net/10520/EJC195093"
- Description: Planococcus citri (citrus mealybug) is a common and damaging citrus crop pest which has proven difficult to control using conventional methods, such as chemical pesticides and insect growth regulators, particularly late in the citrus growing season. The virulence of two entomopathogenic fungal species was studied in laboratory bioassays against the crawlers and adults of P. citri. Isolates of Metarhizium anisopliae and Beauveria bassiana, collected from citrus orchards in the Eastern Cape Province in South Africa, were verified using and molecular techniques. Mealybug bioassays were performed in 24-well plates. Beauveria bassiana (GAR 17 B3) and M. anisopliae (FCM AR 23 B3) isolates both resulted in 67.5 % mortality of mealybug crawlers and B. bassiana (GB AR 23 13 3) resulted in 64 % crawler mortality with concentrations of 1 x 107 conidia/ml. These three isolates were further tested in multipledose bioassays to determine the median lethal concentration (LC50), which were 5.29 x 105conidia/ml for the M. anisopliae isolate (FCM AR 23 B3), 4.25 x 106 conidia/ml for B. bassiana (GAR 17 B3), and 6.65 x 107 conidia/ml B. bassiana (GB AR 23 13 3) for crawlers, respectively. The results of this study suggested that two isolates (M. anisopliae FCM AR 23 B3 and B. bassiana GAR 17 B3) showed potential for further development as biological control agents against citrus mealybug. Further research would be required to determine their ability to perform under field conditions.
- Full Text:
- Date Issued: 2016
- Authors: Chartier Fitzgerald, Veronique , Hill, Martin P , Moore, Sean D , Dames, Joanna F
- Date: 2016
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/407059 , vital:70333 , xlink:href="https://hdl.handle.net/10520/EJC195093"
- Description: Planococcus citri (citrus mealybug) is a common and damaging citrus crop pest which has proven difficult to control using conventional methods, such as chemical pesticides and insect growth regulators, particularly late in the citrus growing season. The virulence of two entomopathogenic fungal species was studied in laboratory bioassays against the crawlers and adults of P. citri. Isolates of Metarhizium anisopliae and Beauveria bassiana, collected from citrus orchards in the Eastern Cape Province in South Africa, were verified using and molecular techniques. Mealybug bioassays were performed in 24-well plates. Beauveria bassiana (GAR 17 B3) and M. anisopliae (FCM AR 23 B3) isolates both resulted in 67.5 % mortality of mealybug crawlers and B. bassiana (GB AR 23 13 3) resulted in 64 % crawler mortality with concentrations of 1 x 107 conidia/ml. These three isolates were further tested in multipledose bioassays to determine the median lethal concentration (LC50), which were 5.29 x 105conidia/ml for the M. anisopliae isolate (FCM AR 23 B3), 4.25 x 106 conidia/ml for B. bassiana (GAR 17 B3), and 6.65 x 107 conidia/ml B. bassiana (GB AR 23 13 3) for crawlers, respectively. The results of this study suggested that two isolates (M. anisopliae FCM AR 23 B3 and B. bassiana GAR 17 B3) showed potential for further development as biological control agents against citrus mealybug. Further research would be required to determine their ability to perform under field conditions.
- Full Text:
- Date Issued: 2016
Community development and rural poverty in Zimbabwe : a policy perspective
- Authors: Chatindo, Annah
- Date: 2016
- Subjects: Community development -- Zimbabwe Rural development -- Government policy -- Zimbabwe Poverty -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MSoc
- Identifier: http://hdl.handle.net/10353/6092 , vital:29490
- Description: There is persistence of rural poverty in African countries despite efforts by governments to implement community development projects to curb poverty in impoverished rural communities. Zimbabwe adopted the Poverty Alleviation Action Plan (PAAP) under which community development programme was initiated. Community development projects by NGOs and government did not manage to meet the needs of the impoverished communities in Mvuma rural communities. More so, the incremental approach to policy making adopted by the government of Zimbabwe failed to embrace the principles of community development, for example, participation of community projects beneficiaries on everything that impact to their way of living. Despite all the efforts to alleviate rural poverty in Mvuma rural district there is still persistence of rural poverty, characterized by poor roads and struggling of most families to meeting basic needs. Mvuma rural communities are rich in mineral resources and water sources that can be utilized instead of relying on external resources through NGOs. This therefore, calls on the government and NGOs to collaborate towards capacitating Mvuma rural dwellers in order to help alleviate poverty. This study employed qualitative approach to research as it was aimed at describing and understanding rather than explaining human behaviour. Purposive or judgmental sampling was applied. This technique was used as the researcher wanted to get hold of the people who are directly or indirectly linked to implementation of community development projects. However, quantitative method was used to gather demographic information. The PAAP policy relevance to poverty reduction in Mvuma rural district and in Zimbabwe in general was the heart of this study.
- Full Text:
- Date Issued: 2016
- Authors: Chatindo, Annah
- Date: 2016
- Subjects: Community development -- Zimbabwe Rural development -- Government policy -- Zimbabwe Poverty -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MSoc
- Identifier: http://hdl.handle.net/10353/6092 , vital:29490
- Description: There is persistence of rural poverty in African countries despite efforts by governments to implement community development projects to curb poverty in impoverished rural communities. Zimbabwe adopted the Poverty Alleviation Action Plan (PAAP) under which community development programme was initiated. Community development projects by NGOs and government did not manage to meet the needs of the impoverished communities in Mvuma rural communities. More so, the incremental approach to policy making adopted by the government of Zimbabwe failed to embrace the principles of community development, for example, participation of community projects beneficiaries on everything that impact to their way of living. Despite all the efforts to alleviate rural poverty in Mvuma rural district there is still persistence of rural poverty, characterized by poor roads and struggling of most families to meeting basic needs. Mvuma rural communities are rich in mineral resources and water sources that can be utilized instead of relying on external resources through NGOs. This therefore, calls on the government and NGOs to collaborate towards capacitating Mvuma rural dwellers in order to help alleviate poverty. This study employed qualitative approach to research as it was aimed at describing and understanding rather than explaining human behaviour. Purposive or judgmental sampling was applied. This technique was used as the researcher wanted to get hold of the people who are directly or indirectly linked to implementation of community development projects. However, quantitative method was used to gather demographic information. The PAAP policy relevance to poverty reduction in Mvuma rural district and in Zimbabwe in general was the heart of this study.
- Full Text:
- Date Issued: 2016
Are people responsive to a more sustainable, decentralized, and user-driven management of urban metabolism?:
- Chelleri, Lorenzo, Kua, Harn W, Rodriguez Sanchez, Juan P, Nahiduzzaman, Kh M, Thondhlana, Gladman
- Authors: Chelleri, Lorenzo , Kua, Harn W , Rodriguez Sanchez, Juan P , Nahiduzzaman, Kh M , Thondhlana, Gladman
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144299 , vital:38329 , https://orcid.org/0000-0001-8253-0264
- Description: Smart, green, and resilient city paradigms have been mainly promoted through top-down and technocratic approaches. However, based on the notion to return to “the right to the city”, emerging community-driven initiatives are providing self-managed infrastructures contributing to urban sustainability transitions. This paper explores the relevance of the behavioral aspects of people-centered approaches in dealing with two different facets of urban metabolism: physical infrastructure (involvement with the management of decentralized infrastructures) and consumption patterns (involvement in proactive reduction of resources used). In the first case we assessed community perceptions about the roles, benefits, and willingness to proactively engage in the management of decentralized green infrastructures in Bogotá City, Colombia. For the second facet, we measured the effectiveness of change agents in re-shaping energy consumption decisions within urban social networks in South Africa and Saudi Arabia. This paper’s results show that pre-determined and standardized strategies do not guarantee positive, nor homogeneous, results in terms of meeting sustainability targets, or promoting community involvement. Hence, a better integration of people-centered and top-down approaches is needed through context-dependent policies, for enhancing both users’ appreciation of and commitment to urban metabolism participative management.
- Full Text:
- Date Issued: 2016
- Authors: Chelleri, Lorenzo , Kua, Harn W , Rodriguez Sanchez, Juan P , Nahiduzzaman, Kh M , Thondhlana, Gladman
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144299 , vital:38329 , https://orcid.org/0000-0001-8253-0264
- Description: Smart, green, and resilient city paradigms have been mainly promoted through top-down and technocratic approaches. However, based on the notion to return to “the right to the city”, emerging community-driven initiatives are providing self-managed infrastructures contributing to urban sustainability transitions. This paper explores the relevance of the behavioral aspects of people-centered approaches in dealing with two different facets of urban metabolism: physical infrastructure (involvement with the management of decentralized infrastructures) and consumption patterns (involvement in proactive reduction of resources used). In the first case we assessed community perceptions about the roles, benefits, and willingness to proactively engage in the management of decentralized green infrastructures in Bogotá City, Colombia. For the second facet, we measured the effectiveness of change agents in re-shaping energy consumption decisions within urban social networks in South Africa and Saudi Arabia. This paper’s results show that pre-determined and standardized strategies do not guarantee positive, nor homogeneous, results in terms of meeting sustainability targets, or promoting community involvement. Hence, a better integration of people-centered and top-down approaches is needed through context-dependent policies, for enhancing both users’ appreciation of and commitment to urban metabolism participative management.
- Full Text:
- Date Issued: 2016
Research as hope intervention: a visual participatory study with rural South African school children
- Authors: Cherrington, Avivit Miriam
- Date: 2016
- Subjects: Affective education -- South Africa , Critical pedagogy -- South Africa , Hope -- Social aspects -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD (Education)
- Identifier: http://hdl.handle.net/10948/8350 , vital:26348
- Description: There is a dearth of knowledge on rural South African children’s perspectives of hope, and how their hope can be nurtured, shaped, and strengthened. Guided by a qualitative approach, and located within a critical transformative paradigm, this study explores the following research question: How could visual participatory methodology as ‘research as intervention’ enable rural South African primary school children to explore their conceptualisations of hope, as well as strengthen their hope? To answer this question I pose two sub-questions: Firstly, what are rural primary school children’s conceptualisations of hope? Secondly, how could using visual participatory methodology to explore their hope also strengthen the children’s hope? Hope plays a key role in the lives of people, influencing decisions and behaviour, as well as coping skills and wellbeing. The socio-economic and cultural contexts in which rural South African children find themselves are critical in enabling hope and influencing their psychosocial wellbeing. While international hope research boasts a diversity of theories, there is scarce representation of such research from an African perspective. Unable to turn to an Afrocentric theory of hope this study is framed by two theories from the global-North: Scioli’s (2007) Integrative theory of hope which provides a description of the individual’s hope process, and Prilleltensky and Prilleltensky’s (2007) Framework of psychosocial wellbeing which provides a broader context in which to view this process. Over a period of a year I engaged with twelve purposively selected 9-13 year old Basotho children, beneficiaries of a children’s programme situated in a rural village in the QwaQwa region, Free State, South Africa, to explore their hope. Using visual participatory methodology, data was co-constructed through four visual data generating tools (collage-making, drawing, Mmogo-method®, and photovoice), as well as individual interviews, a group interview, and notes and photographs kept in my research journal. A qualitative thematic analysis was followed, and a literature control conducted to re-contextualise the findings. The results of this study are presented in themes. The first three themes, Hope is having a better life; Hope is community participation and togetherness; and Hope is weakened by others and by one’s environment, combine to represent hope as a multi-layered, multi-dimensional experience towards attaining a better life on a contextual, personal, relational, and collective level. These levels of hope are all inter-related, interdependent, and influenced by cultural factors and the children’s belief system (or worldview). I therefore conclude that, according to these rural South African school children, hope is an internal process of being that develops within the individual, with assistance from external resources, and then extends outwardly through hopeful beliefs, feelings, and behaviours to promote togetherness, care, and respect in one’s community. The last three themes, Strengthened personal hope; Enhanced relational hope; and Mobilised collective hope, show that using visual participatory methodology to engage the participants in an exploration of hope potentially strengthened, enhanced, and mobilised their hope across three inter-related and overlapping levels: Personal, Relational, and Collective. The participants expressed a growing understanding of their hoping process, increased sense of autonomy, and improved coping skills for strengthening their own hope. They also began to refer to themselves as Hope Champions - able to foster hope in others by behaving in a hopeful manner, teaching others about hope, and offering care and support. I therefore conclude that this shifting view of themselves as competent and valuable members of the community mobilised their collective level of hope as they began to formulate ideas of how they could be active citizens in their community, pursuing collective wellbeing for themselves and other members of the community so that everyone could live a better life. The findings have several implications for educational psychologists working with marginalised and vulnerable children’s hope, for fostering hope in school contexts, and for educational hope research with marginalised children in rural South African communities. While this study cannot presume to have achieved long-term social change, it does certainly lay the foundation for proposing that ‘research as intervention’ has promising potential as ‘research as hope-intervention’ in educational contexts. In responding to the research question, I argue that visual participatory research methodology, when focused on hope, is in and of itself a hope-enhancing intervention. Consequently, combining visual participatory methodology with hope-focused explorations enables ‘research as hope-intervention’, facilitating a strengthening of the participants’ hope, and resulting in meaningful personal transformation. I conclude that using ‘research as hope-intervention’ with rural South African children holds many possibilities for mobilising a ‘pedagogy of hope’.
- Full Text:
- Date Issued: 2016
Research as hope intervention: a visual participatory study with rural South African school children
- Authors: Cherrington, Avivit Miriam
- Date: 2016
- Subjects: Affective education -- South Africa , Critical pedagogy -- South Africa , Hope -- Social aspects -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD (Education)
- Identifier: http://hdl.handle.net/10948/8350 , vital:26348
- Description: There is a dearth of knowledge on rural South African children’s perspectives of hope, and how their hope can be nurtured, shaped, and strengthened. Guided by a qualitative approach, and located within a critical transformative paradigm, this study explores the following research question: How could visual participatory methodology as ‘research as intervention’ enable rural South African primary school children to explore their conceptualisations of hope, as well as strengthen their hope? To answer this question I pose two sub-questions: Firstly, what are rural primary school children’s conceptualisations of hope? Secondly, how could using visual participatory methodology to explore their hope also strengthen the children’s hope? Hope plays a key role in the lives of people, influencing decisions and behaviour, as well as coping skills and wellbeing. The socio-economic and cultural contexts in which rural South African children find themselves are critical in enabling hope and influencing their psychosocial wellbeing. While international hope research boasts a diversity of theories, there is scarce representation of such research from an African perspective. Unable to turn to an Afrocentric theory of hope this study is framed by two theories from the global-North: Scioli’s (2007) Integrative theory of hope which provides a description of the individual’s hope process, and Prilleltensky and Prilleltensky’s (2007) Framework of psychosocial wellbeing which provides a broader context in which to view this process. Over a period of a year I engaged with twelve purposively selected 9-13 year old Basotho children, beneficiaries of a children’s programme situated in a rural village in the QwaQwa region, Free State, South Africa, to explore their hope. Using visual participatory methodology, data was co-constructed through four visual data generating tools (collage-making, drawing, Mmogo-method®, and photovoice), as well as individual interviews, a group interview, and notes and photographs kept in my research journal. A qualitative thematic analysis was followed, and a literature control conducted to re-contextualise the findings. The results of this study are presented in themes. The first three themes, Hope is having a better life; Hope is community participation and togetherness; and Hope is weakened by others and by one’s environment, combine to represent hope as a multi-layered, multi-dimensional experience towards attaining a better life on a contextual, personal, relational, and collective level. These levels of hope are all inter-related, interdependent, and influenced by cultural factors and the children’s belief system (or worldview). I therefore conclude that, according to these rural South African school children, hope is an internal process of being that develops within the individual, with assistance from external resources, and then extends outwardly through hopeful beliefs, feelings, and behaviours to promote togetherness, care, and respect in one’s community. The last three themes, Strengthened personal hope; Enhanced relational hope; and Mobilised collective hope, show that using visual participatory methodology to engage the participants in an exploration of hope potentially strengthened, enhanced, and mobilised their hope across three inter-related and overlapping levels: Personal, Relational, and Collective. The participants expressed a growing understanding of their hoping process, increased sense of autonomy, and improved coping skills for strengthening their own hope. They also began to refer to themselves as Hope Champions - able to foster hope in others by behaving in a hopeful manner, teaching others about hope, and offering care and support. I therefore conclude that this shifting view of themselves as competent and valuable members of the community mobilised their collective level of hope as they began to formulate ideas of how they could be active citizens in their community, pursuing collective wellbeing for themselves and other members of the community so that everyone could live a better life. The findings have several implications for educational psychologists working with marginalised and vulnerable children’s hope, for fostering hope in school contexts, and for educational hope research with marginalised children in rural South African communities. While this study cannot presume to have achieved long-term social change, it does certainly lay the foundation for proposing that ‘research as intervention’ has promising potential as ‘research as hope-intervention’ in educational contexts. In responding to the research question, I argue that visual participatory research methodology, when focused on hope, is in and of itself a hope-enhancing intervention. Consequently, combining visual participatory methodology with hope-focused explorations enables ‘research as hope-intervention’, facilitating a strengthening of the participants’ hope, and resulting in meaningful personal transformation. I conclude that using ‘research as hope-intervention’ with rural South African children holds many possibilities for mobilising a ‘pedagogy of hope’.
- Full Text:
- Date Issued: 2016
Enablers and barriers to involvement in commercialisation
- Authors: Chetty, Mary-Ann T
- Date: 2016
- Subjects: Commercialism , Entrepreneurship , Technology transfer
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/4720 , vital:20657
- Description: Universities are facing growing pressure to contribute towards innovation which has social impact and which contributes to economic development. Researchers mainly in the Science and Engineering fields are the primary sources of innovation outputs from universities and as such their involvement in commercialisation activities directly adds to the growth of innovative outputs from publicly financed research. Technology Transfer Offices (TTO) have been established at universities across South Africa to foster the involvement of researchers in commercialisation activities, to champion the innovation conversation within higher education institutions and to progress innovations from concept to application in society. This study focussed on understanding the factors which enable or create a barrier to the involvement of researchers in commercialisation activities at the Nelson Mandela Metropolitan University. The key elements examined in this study include the researchers’ perception of enablers (monetary and nonmonetary incentives) and barriers to involvement at national, institutional and individual levels. This study undertook to understand the perceptions of researchers of enablers and barriers to involvement in commercialisation at the Nelson Mandela Metropolitan University. Researchers in the two faculties of Science and Engineering, Built Environment and Information Technology were approached to anonymously complete an electronic survey, the questions for which were developed from literature. The results from the survey were analysed using descriptive statistics and hypothesis testing. This study finds that a combination of incentives is necessary to enable researcher involvement and to lower barriers to involvement in commercialisation research. A set of recommendations based on the study are put forward on how such recommendations can be implemented.
- Full Text:
- Date Issued: 2016
- Authors: Chetty, Mary-Ann T
- Date: 2016
- Subjects: Commercialism , Entrepreneurship , Technology transfer
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/4720 , vital:20657
- Description: Universities are facing growing pressure to contribute towards innovation which has social impact and which contributes to economic development. Researchers mainly in the Science and Engineering fields are the primary sources of innovation outputs from universities and as such their involvement in commercialisation activities directly adds to the growth of innovative outputs from publicly financed research. Technology Transfer Offices (TTO) have been established at universities across South Africa to foster the involvement of researchers in commercialisation activities, to champion the innovation conversation within higher education institutions and to progress innovations from concept to application in society. This study focussed on understanding the factors which enable or create a barrier to the involvement of researchers in commercialisation activities at the Nelson Mandela Metropolitan University. The key elements examined in this study include the researchers’ perception of enablers (monetary and nonmonetary incentives) and barriers to involvement at national, institutional and individual levels. This study undertook to understand the perceptions of researchers of enablers and barriers to involvement in commercialisation at the Nelson Mandela Metropolitan University. Researchers in the two faculties of Science and Engineering, Built Environment and Information Technology were approached to anonymously complete an electronic survey, the questions for which were developed from literature. The results from the survey were analysed using descriptive statistics and hypothesis testing. This study finds that a combination of incentives is necessary to enable researcher involvement and to lower barriers to involvement in commercialisation research. A set of recommendations based on the study are put forward on how such recommendations can be implemented.
- Full Text:
- Date Issued: 2016
The effects of land use on the avifauna and its conservation in a Kenyan coastal forest ecosystem, and the significance of the Arabuko Sokoke Forest to the local community
- Authors: Chiawo, David O
- Date: 2016
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5950 , http://hdl.handle.net/10962/d1020946
- Description: This study examines the effects of land use on the bird community of Arabuko Sokoke Forest, the largest area of coastal forest remaining in East Africa and a major Important Bird Area in mainland Kenya. Bird species diversity in three land use types (primary forest, plantation and farm lands) was compared using multivariate analysis to determine the response of different feeding guilds to habitat characteristics. The effect of habitat characteristics on overall bird diversity and specific feeding guilds was tested using linear mixed models. A total of 2600 bird observations were recorded during point counts, representing 97 bird species including 25 fruit-eating birds, 17 nectar feeders; and 60 species belonging exclusively to other feeding guilds. Land use had a significant effect on overall bird diversity and abundance. The distribution of frugivorous birds was primarily influenced by the presence of fruiting trees rather than land use type, while nectarivores were significantly affected by vertical habitat heterogeneity and vegetation type. Although the distribution of insectivorous birds is influenced by many habitat factors, proximity to natural forest, habitat heterogeneity, and the presence of large trees and fruiting trees appear to be most important to this guild. The natural forest has the greatest avian diversity and a distinctive community compared to plantation and farmlands. Patterns of habitat use by birds in the area suggest that vertical vegetation heterogeneity and complexity is especially significant in sustaining diverse and abundant bird populations, if they are in close proximity to native forests. Improvement of conservation management for the plantation and farmlands is thus critical for connectivity with other remnant primary forest patches in the area. Socio-economic data was collected from 109 forest adjacent households to determine the value of the forest to the local community and their perception of conservation issues. Arabuko Sokoke Forest is important in supplementing the livelihood needs of the local community. However, the community lacks information on the forest management plan and many people have little knowledge of local birds, which could limit their capacity to participate in conservation projects. Drivers for local community participation in conservation projects are primarily a sustainable income and the fulfillment of basic household needs. Community conservation education is needed to promote local knowledge of forest biodiversity, as well as clear frameworks for the active involvement of the local community in forest management. Support of community based projects is vital to achieve both the conservation and livelihood objectives of the Arabuko Sokoke Forest management plan.
- Full Text:
- Date Issued: 2016
- Authors: Chiawo, David O
- Date: 2016
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5950 , http://hdl.handle.net/10962/d1020946
- Description: This study examines the effects of land use on the bird community of Arabuko Sokoke Forest, the largest area of coastal forest remaining in East Africa and a major Important Bird Area in mainland Kenya. Bird species diversity in three land use types (primary forest, plantation and farm lands) was compared using multivariate analysis to determine the response of different feeding guilds to habitat characteristics. The effect of habitat characteristics on overall bird diversity and specific feeding guilds was tested using linear mixed models. A total of 2600 bird observations were recorded during point counts, representing 97 bird species including 25 fruit-eating birds, 17 nectar feeders; and 60 species belonging exclusively to other feeding guilds. Land use had a significant effect on overall bird diversity and abundance. The distribution of frugivorous birds was primarily influenced by the presence of fruiting trees rather than land use type, while nectarivores were significantly affected by vertical habitat heterogeneity and vegetation type. Although the distribution of insectivorous birds is influenced by many habitat factors, proximity to natural forest, habitat heterogeneity, and the presence of large trees and fruiting trees appear to be most important to this guild. The natural forest has the greatest avian diversity and a distinctive community compared to plantation and farmlands. Patterns of habitat use by birds in the area suggest that vertical vegetation heterogeneity and complexity is especially significant in sustaining diverse and abundant bird populations, if they are in close proximity to native forests. Improvement of conservation management for the plantation and farmlands is thus critical for connectivity with other remnant primary forest patches in the area. Socio-economic data was collected from 109 forest adjacent households to determine the value of the forest to the local community and their perception of conservation issues. Arabuko Sokoke Forest is important in supplementing the livelihood needs of the local community. However, the community lacks information on the forest management plan and many people have little knowledge of local birds, which could limit their capacity to participate in conservation projects. Drivers for local community participation in conservation projects are primarily a sustainable income and the fulfillment of basic household needs. Community conservation education is needed to promote local knowledge of forest biodiversity, as well as clear frameworks for the active involvement of the local community in forest management. Support of community based projects is vital to achieve both the conservation and livelihood objectives of the Arabuko Sokoke Forest management plan.
- Full Text:
- Date Issued: 2016
The legal protection of foreign direct investment in the new millennium :a critical assessment with a focus on South Africa and Zimbabwe
- Authors: Chidede, Talkmore
- Date: 2016
- Subjects: Investments, Foreign -- Law and legislation Economic policy
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10353/7919 , vital:30814
- Description: The increasing investment gap and reduction in foreign aid has made several developing countries to turn to foreign investment as a mechanism to circumvent their financial constraints among other things. There is substantial empirical evidence that foreign direct investment enhances economic development, employment creation, national competitiveness and diffusion of technology from foreign firms to local firms and workers of the host states. As a result, this study firstly argues that foreign investment is much needed in South Africa and Zimbabwe to improve economic growth and development, create employment and increase their competitiveness in the global market. However, these benefits do not accrue automatically but the host states need to create an enabling environment to exploit such benefits. The legal protection of foreign investment has become a fundamental issue in both international and national law. Efforts have been and are still being made in law as well as in practice to implement national investment legal regimes which are in line with international norms or standards. This study undertakes a contemporary assessment of the legal protection of foreign investment in South Africa and Zimbabwe with a view of examining their compliance with international minimum norms, standards and/or best practices. More recently, both South Africa and Zimbabwe have crafted and implemented investment laws and related policies which are perceived to be somewhat hostile towards foreign investment. To achieve this, selected investment laws and related policies in both jurisdictions are critically analysed. This study puts forward an argument and recommendations for policy makers in both South Africa and Zimbabwe for strategic refinements of investment laws and related policies such that they become flexible, friendly and certain to foreign investors while at the same time advancing their respective national policies aimed at the economic empowerment of local citizens.
- Full Text:
- Date Issued: 2016
- Authors: Chidede, Talkmore
- Date: 2016
- Subjects: Investments, Foreign -- Law and legislation Economic policy
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10353/7919 , vital:30814
- Description: The increasing investment gap and reduction in foreign aid has made several developing countries to turn to foreign investment as a mechanism to circumvent their financial constraints among other things. There is substantial empirical evidence that foreign direct investment enhances economic development, employment creation, national competitiveness and diffusion of technology from foreign firms to local firms and workers of the host states. As a result, this study firstly argues that foreign investment is much needed in South Africa and Zimbabwe to improve economic growth and development, create employment and increase their competitiveness in the global market. However, these benefits do not accrue automatically but the host states need to create an enabling environment to exploit such benefits. The legal protection of foreign investment has become a fundamental issue in both international and national law. Efforts have been and are still being made in law as well as in practice to implement national investment legal regimes which are in line with international norms or standards. This study undertakes a contemporary assessment of the legal protection of foreign investment in South Africa and Zimbabwe with a view of examining their compliance with international minimum norms, standards and/or best practices. More recently, both South Africa and Zimbabwe have crafted and implemented investment laws and related policies which are perceived to be somewhat hostile towards foreign investment. To achieve this, selected investment laws and related policies in both jurisdictions are critically analysed. This study puts forward an argument and recommendations for policy makers in both South Africa and Zimbabwe for strategic refinements of investment laws and related policies such that they become flexible, friendly and certain to foreign investors while at the same time advancing their respective national policies aimed at the economic empowerment of local citizens.
- Full Text:
- Date Issued: 2016
Fatty acid composition, colour stability and lipid oxidation of mince produced from fresh and frozen/thawed fallow deer meat
- Authors: Chido, Chakanya
- Date: 2016
- Subjects: Lipids -- Oxidation Meat -- Preservation Mincemeat
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/2479 , vital:27874
- Description: The aim of the study was to determine the fatty acid composition, colour stability and lipid oxidation of fresh mince produced from fallow deer and to evaluate the effect of frozen storage duration on the retail display shelf life of the mince. A total of 31 fallow deer carcasses were used in the study. After cooling for 24hrs, the carcasses were deboned, external fat from the fore and hindquarter muscles removed and individually vacuum packed. For the first trial, seven fallow deer carcasses were used. Meat from the hind and fore-quarters of each carcass was divided into two equal batches per animal. One batch was minced (through a 5 mm die) and packed into oxygen permeable overwraps and refrigerated at 4°C for a period of eight days under retail display conditions. The second batch was vacuum packed and frozen at -20°C for 2 months at the end of which mince was also produced and monitored over an eight-day period under the same conditions that were used for the fresh mince. Colour, pH, lipid and myoglobin stability was determined. Proximate and fatty acid composition was also determined. No differences (P>0.05) were noted between proximate composition of fresh and frozen/thawed minced meat. The lipid content of fallow deer was 2.4 percent (±0.04). Total n3 fatty acids differed (P<0.05) between treatments and decreased with increased storage and display day. There were significant (P<0.05) treatment and time interactions on all measured colour parameters, TBARS and myoglobin forms. Fresh mince was lighter and had higher redness (a*) and yellowness (b*) values than mince from two months frozen stored meat. Hue angle for fresh mince remained stable throughout display whereas it increased for frozen/thawed mince. Fresh mince had lower TBARS values than frozen/thawed mince. Minced meat produced from frozen/thawed deer meat had higher surface met-myoglobin and total met-myoglobin percentages. Surface and total oxy-myoglobin percentage was higher in fresh mince. The first trial clearly showed colour and lipid stability differences between fresh mince and mince from frozen/thawed meat. It also showed that fresh mince has a longer retail display life than mince produced from frozen/thawed meat (six days and four days, respectively). In the second trial, the effects of frozen storage duration on colour and lipid stability were investigated. Twenty-four fallow deer were used. Twelve were harvested in June (6male 6female) and the other twelve in August (6 male 6female) of the same year.Twenty four hours after harvesting, the fore and hindquarter muscles of the carcasses were deboned, vacuum packed and kept at -20°C until October (i.e. 2months and 4months frozen storage period). Upon thawing, the meat was processed into mince following the same procedure used for the first trialand displayed for a fiveday period under retail display conditions. Frozen duration and gender had no effect (P>0.05) on the proximate composition of fallow deer meat. The total amount of saturated fatty acids (SFA) increased and total amount of poly unsaturated fatty acids (PUFA) decreased as frozen duration and display day increased (P<0.05). Frozen duration affected (P<0.01) lipid oxidation and percentage oxy-myoglobin. Mince pH and all colour parameters (L*, a*, b*,hue and chroma) differed (P<0.05) between treatments on day zero and three. Display day was a significant factor (P<0.05) on all measured parameters. By day three all parameters except pH showed signs of extended oxidation and discolouration as evidenced by reduced redness, decreased colour intensity and high TBARS values. This study showed that prolonged frozen storage negatively affects the colour and lipid stability of meat and increases oxidation of PUFAs during frozen storage. However, the study also suggests that although frozen/thawed meat has a shorter retail display shelf life; the proximate composition of the meat remains unchanged.
- Full Text:
- Date Issued: 2016
- Authors: Chido, Chakanya
- Date: 2016
- Subjects: Lipids -- Oxidation Meat -- Preservation Mincemeat
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/2479 , vital:27874
- Description: The aim of the study was to determine the fatty acid composition, colour stability and lipid oxidation of fresh mince produced from fallow deer and to evaluate the effect of frozen storage duration on the retail display shelf life of the mince. A total of 31 fallow deer carcasses were used in the study. After cooling for 24hrs, the carcasses were deboned, external fat from the fore and hindquarter muscles removed and individually vacuum packed. For the first trial, seven fallow deer carcasses were used. Meat from the hind and fore-quarters of each carcass was divided into two equal batches per animal. One batch was minced (through a 5 mm die) and packed into oxygen permeable overwraps and refrigerated at 4°C for a period of eight days under retail display conditions. The second batch was vacuum packed and frozen at -20°C for 2 months at the end of which mince was also produced and monitored over an eight-day period under the same conditions that were used for the fresh mince. Colour, pH, lipid and myoglobin stability was determined. Proximate and fatty acid composition was also determined. No differences (P>0.05) were noted between proximate composition of fresh and frozen/thawed minced meat. The lipid content of fallow deer was 2.4 percent (±0.04). Total n3 fatty acids differed (P<0.05) between treatments and decreased with increased storage and display day. There were significant (P<0.05) treatment and time interactions on all measured colour parameters, TBARS and myoglobin forms. Fresh mince was lighter and had higher redness (a*) and yellowness (b*) values than mince from two months frozen stored meat. Hue angle for fresh mince remained stable throughout display whereas it increased for frozen/thawed mince. Fresh mince had lower TBARS values than frozen/thawed mince. Minced meat produced from frozen/thawed deer meat had higher surface met-myoglobin and total met-myoglobin percentages. Surface and total oxy-myoglobin percentage was higher in fresh mince. The first trial clearly showed colour and lipid stability differences between fresh mince and mince from frozen/thawed meat. It also showed that fresh mince has a longer retail display life than mince produced from frozen/thawed meat (six days and four days, respectively). In the second trial, the effects of frozen storage duration on colour and lipid stability were investigated. Twenty-four fallow deer were used. Twelve were harvested in June (6male 6female) and the other twelve in August (6 male 6female) of the same year.Twenty four hours after harvesting, the fore and hindquarter muscles of the carcasses were deboned, vacuum packed and kept at -20°C until October (i.e. 2months and 4months frozen storage period). Upon thawing, the meat was processed into mince following the same procedure used for the first trialand displayed for a fiveday period under retail display conditions. Frozen duration and gender had no effect (P>0.05) on the proximate composition of fallow deer meat. The total amount of saturated fatty acids (SFA) increased and total amount of poly unsaturated fatty acids (PUFA) decreased as frozen duration and display day increased (P<0.05). Frozen duration affected (P<0.01) lipid oxidation and percentage oxy-myoglobin. Mince pH and all colour parameters (L*, a*, b*,hue and chroma) differed (P<0.05) between treatments on day zero and three. Display day was a significant factor (P<0.05) on all measured parameters. By day three all parameters except pH showed signs of extended oxidation and discolouration as evidenced by reduced redness, decreased colour intensity and high TBARS values. This study showed that prolonged frozen storage negatively affects the colour and lipid stability of meat and increases oxidation of PUFAs during frozen storage. However, the study also suggests that although frozen/thawed meat has a shorter retail display shelf life; the proximate composition of the meat remains unchanged.
- Full Text:
- Date Issued: 2016
Continuous flow synthesis of silicon compounds as feedstock for solar-grade silicon production
- Authors: Chigondo, Fidelis
- Date: 2016
- Subjects: Silicon -- Synthesis , Homogeneous catalysis
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: http://hdl.handle.net/10948/4529 , vital:20613
- Description: This thesis describes the key steps in the production of high purity (solar-grade) silicon from metallurgical-grade silicon for use in the production of photovoltaic cells as alternative renewable, environmentally benign and cheap energy source. The initial part of the project involves the development and optimization of a small chemical production platform system capable of producing alkoxysilanes from metallurgical-grade silicon as green precursors to solar-grade silicon production. Specifically, the main aim of the study was to synthesize trialkoxysilanes in continuous flow mode, although the synthesis on monosilane was also done in batch mode. The alkoxylation reaction was carried out in a traditional slurry phase batch reactor, packed bed flow tubular reactor and also attempted in a continuous flow falling film tubular reactor. The effect of key parameters which affect the silicon conversion and selectivity for the desired trialkoxysilane were investigated and optimized using ethanol as a reagent model. The synthesis was then extended to the other alcohols namely methanol, n-propanol and n-butanol. Copper catalysts which were tested in the alkoxylation reaction included: CuCl, Cu(OH)2, CuO and CuSO4. CuCl and Cu(OH)2 showed comparable activity in the batch mode but the former was more efficient in the packed bed flow tubular reactor. Cu(OH)2 could be used as a non-halide catalyst but its activity is limited to short reaction cycles (<10 h). The uncatalysed reaction resulted in negligible reaction rates in both types of reactors. High temperature catalyst pre-heating (>500 oC) resulted in a lower rate of reaction and selectivity than when slightly lower temperatures are used (<350 oC) in both reactors, although much difference was noticed in the packed bed flow tubular reactor. Synthesis in the batch reactor needed longer silicon-catalyst activation time, higher pre-heating temperature and higher catalyst amounts as compare to the packed bed flow tubular reactor. Reaction temperature and alcohol flow rate influenced the reaction in both methods. The optimum reaction temperature range and alcohol flow rate was comparable in both reactors (230 to 240 oC) and 0.1mL/min respectively. The effect of alcohol R-group (C1 to C4) on the reaction revealed that conversion and selectivity generally decrease with an increase in carbon chain length in both methods. Ethanol showed highest selectivity (>95% in batch and >97% in flow) and conversion (about 88% in batch and about 64% in flow) as compared to all other alcohols studied showing that it could be the most efficient alkoxylation alcohol for this reaction. Overally, the packed bed flow tubular reactor resulted in higher selectivity to trialkoxysilanes than the batch system. Performing the reaction under pressure resulted in increased conversion but selectivity to the desire trialkoxysilane diminished. Synthesis in a continuous flow falling film tubular reactor was not successful as it resulted in very poor conversion and selectivity. Monosilane was successfully synthesized from the disproportionation of triethoxysilane using homogeneous and heterogeneous catalysts in batch mode. The results obtained from homogeneous catalysis showed that the reaction can be conducted at room temperature. The heterogeneous catalysis method resulted in slow conversion at room temperature but mild heating up to 55 oC greatly improved the reaction. Conducting the reaction under neat conditions produced comparable results to reactions which were carried out using solvents. The disproportionation reaction was best described by the first order kinetic model. The results obtained in this research indicate that the packed bed flow tubular reactor can be utilized with future modifications for continuous flow synthesis of alkoxysilanes as feedstock for the solar-grade silicon production.
- Full Text:
- Date Issued: 2016
- Authors: Chigondo, Fidelis
- Date: 2016
- Subjects: Silicon -- Synthesis , Homogeneous catalysis
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: http://hdl.handle.net/10948/4529 , vital:20613
- Description: This thesis describes the key steps in the production of high purity (solar-grade) silicon from metallurgical-grade silicon for use in the production of photovoltaic cells as alternative renewable, environmentally benign and cheap energy source. The initial part of the project involves the development and optimization of a small chemical production platform system capable of producing alkoxysilanes from metallurgical-grade silicon as green precursors to solar-grade silicon production. Specifically, the main aim of the study was to synthesize trialkoxysilanes in continuous flow mode, although the synthesis on monosilane was also done in batch mode. The alkoxylation reaction was carried out in a traditional slurry phase batch reactor, packed bed flow tubular reactor and also attempted in a continuous flow falling film tubular reactor. The effect of key parameters which affect the silicon conversion and selectivity for the desired trialkoxysilane were investigated and optimized using ethanol as a reagent model. The synthesis was then extended to the other alcohols namely methanol, n-propanol and n-butanol. Copper catalysts which were tested in the alkoxylation reaction included: CuCl, Cu(OH)2, CuO and CuSO4. CuCl and Cu(OH)2 showed comparable activity in the batch mode but the former was more efficient in the packed bed flow tubular reactor. Cu(OH)2 could be used as a non-halide catalyst but its activity is limited to short reaction cycles (<10 h). The uncatalysed reaction resulted in negligible reaction rates in both types of reactors. High temperature catalyst pre-heating (>500 oC) resulted in a lower rate of reaction and selectivity than when slightly lower temperatures are used (<350 oC) in both reactors, although much difference was noticed in the packed bed flow tubular reactor. Synthesis in the batch reactor needed longer silicon-catalyst activation time, higher pre-heating temperature and higher catalyst amounts as compare to the packed bed flow tubular reactor. Reaction temperature and alcohol flow rate influenced the reaction in both methods. The optimum reaction temperature range and alcohol flow rate was comparable in both reactors (230 to 240 oC) and 0.1mL/min respectively. The effect of alcohol R-group (C1 to C4) on the reaction revealed that conversion and selectivity generally decrease with an increase in carbon chain length in both methods. Ethanol showed highest selectivity (>95% in batch and >97% in flow) and conversion (about 88% in batch and about 64% in flow) as compared to all other alcohols studied showing that it could be the most efficient alkoxylation alcohol for this reaction. Overally, the packed bed flow tubular reactor resulted in higher selectivity to trialkoxysilanes than the batch system. Performing the reaction under pressure resulted in increased conversion but selectivity to the desire trialkoxysilane diminished. Synthesis in a continuous flow falling film tubular reactor was not successful as it resulted in very poor conversion and selectivity. Monosilane was successfully synthesized from the disproportionation of triethoxysilane using homogeneous and heterogeneous catalysts in batch mode. The results obtained from homogeneous catalysis showed that the reaction can be conducted at room temperature. The heterogeneous catalysis method resulted in slow conversion at room temperature but mild heating up to 55 oC greatly improved the reaction. Conducting the reaction under neat conditions produced comparable results to reactions which were carried out using solvents. The disproportionation reaction was best described by the first order kinetic model. The results obtained in this research indicate that the packed bed flow tubular reactor can be utilized with future modifications for continuous flow synthesis of alkoxysilanes as feedstock for the solar-grade silicon production.
- Full Text:
- Date Issued: 2016