An assessment of the implementation of human resource planning and development and its effect on service delivery in the ministry of health and social welfare in Tanzania
- Authors: Rwiza, Edith
- Date: 2017
- Subjects: Personnel management--Tanzania Civil service--Tanzania Public health--Tanzania
- Language: English
- Type: Thesis , Doctoral , Public Administration
- Identifier: http://hdl.handle.net/10353/11861 , vital:39113
- Description: Public health is a major concern to a number of countries, due to its ripple impact in the economy. The aim of this study was to investigate the factors that contribute to the implementation of HRP and D in the Tanzanian health sector. To achieve this, 22 respondents from the Ministry Secretariat and Directors were interviewed, and 355 questionnaires were administered to beneficiaries of the HRP and D. A mixed method approach was utilised to analyse the data collected from the respondents. The findings of the study pointed that males dominated the sample, with the majority holding postgraduate qualification. In terms of the implementation of the HRP, 49 percent of the respondents stated that it was satisfactory. While, in terms of capacity, 67 percent were of the view that there is a shortage of skilled staff. The challenges identified include inequality in the allocation of staff, lack of skills, knowledge and experience, and oversupply of staff in certain regions. Strategies proposed for enhancing the application of HRP and D include an overhaul in the organisation structure, solving staff welfare issues, ethics and values improvement, and management of staff. The study recommends that the government should allocate adequate budget to the Ministry of Health and Social Welfare to implement Human Resource Planning and Human Resource Development in all levels of the sector as directed by President’s Office, and the Public Service Management (PO-PSM). The study also recommends on the improvement of the Human Capital Management Information System (HCMIS) to assess health workers movement. Lastly, the study recommends that there should be good coordination, cooperation, and clear lines of authority between stakeholders of health system in supervision and regulation in the implementation of HRP and HRD plans.
- Full Text:
- Date Issued: 2017
- Authors: Rwiza, Edith
- Date: 2017
- Subjects: Personnel management--Tanzania Civil service--Tanzania Public health--Tanzania
- Language: English
- Type: Thesis , Doctoral , Public Administration
- Identifier: http://hdl.handle.net/10353/11861 , vital:39113
- Description: Public health is a major concern to a number of countries, due to its ripple impact in the economy. The aim of this study was to investigate the factors that contribute to the implementation of HRP and D in the Tanzanian health sector. To achieve this, 22 respondents from the Ministry Secretariat and Directors were interviewed, and 355 questionnaires were administered to beneficiaries of the HRP and D. A mixed method approach was utilised to analyse the data collected from the respondents. The findings of the study pointed that males dominated the sample, with the majority holding postgraduate qualification. In terms of the implementation of the HRP, 49 percent of the respondents stated that it was satisfactory. While, in terms of capacity, 67 percent were of the view that there is a shortage of skilled staff. The challenges identified include inequality in the allocation of staff, lack of skills, knowledge and experience, and oversupply of staff in certain regions. Strategies proposed for enhancing the application of HRP and D include an overhaul in the organisation structure, solving staff welfare issues, ethics and values improvement, and management of staff. The study recommends that the government should allocate adequate budget to the Ministry of Health and Social Welfare to implement Human Resource Planning and Human Resource Development in all levels of the sector as directed by President’s Office, and the Public Service Management (PO-PSM). The study also recommends on the improvement of the Human Capital Management Information System (HCMIS) to assess health workers movement. Lastly, the study recommends that there should be good coordination, cooperation, and clear lines of authority between stakeholders of health system in supervision and regulation in the implementation of HRP and HRD plans.
- Full Text:
- Date Issued: 2017
An evaluation of the implementation of the South African Police Service Sector policing in the Eastern Cape
- Authors: Lamana, Andile Robert
- Date: 2017
- Subjects: South African Police Service Police -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5271 , vital:29180
- Description: This study focussed on the evaluation of the implementation of the South African Police Service sector policing in the Eastern Cape province of South Africa. A mixed methods approach was used to gather, collect and analyse data for this study. The data were collected through semi-structured in-depth interviews, focus groups discussions and a survey. The quantitative approach dominated in data collection, whilst the qualitative approach was used to corroborate the quantitative findings. For the quantitative approach, 265 questionnaires were administered to 121 volunteer participants targeting the station commanders, cluster commanders and sector commanders. A hundred and forty questionnaires were also administered to the Sector Crime Forum chairpersons who were selected using simple random sampling from 32 police stations. The sector commanders were used for in depth interviews. The rationale behind was that the sector commanders are playing a key role in the implementation of sector policing. Simple random sampling was used to select the participants. The study area was in the Eastern Cape, where the research sample and participants were drawn. The findings of the study indicated that although sector policing minimum standards have been achieved by many stations, the study found out that there are some stations that have not yet attained the policy goals in terms of optimal implementation of sector policing in the Eastern Cape Province. The study established that the farm and rural and remote police stations were not complying with the minimum standards laid down in the National Instruction 3/2009. The problem of non-compliance emanates from the shortages of resources. Further findings on this study were based on the experiences and challenges of the implementers of sector policing. The study found that there were challenges confronted by them in the implementation process. Although some of the participants were indicating their enjoying working closely with their communities, there were some major challenges that they experienced in the process of executing their duties. The results of the study indicate that resources were not adequate to ensure that this new policing strategy is properly executed. Another important finding which was identified by the study was the fact that sector policing, as a new policing strategy, was not adequately communicated and marketed for it to be accepted and to for it to achieve the necessary buy in from stakeholders. The study further established that training, development and capacity building were lacking to capacitate the implementers of the new policing strategy. Further, sector to sector collaboration was identified as another challenge by the study. Team work was very much limited. The study further revealed that command and control was not enhanced by the sector commanders in their sectors. The sector patrol reports were not available in the files and AVL reports were also not retrieved and monitored. The factors highlighted above have a negative bearing on the reduction of crime. Poor police visibility and stakeholder participation in crime prevention programmes are not reducing crime.
- Full Text:
- Date Issued: 2017
- Authors: Lamana, Andile Robert
- Date: 2017
- Subjects: South African Police Service Police -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/5271 , vital:29180
- Description: This study focussed on the evaluation of the implementation of the South African Police Service sector policing in the Eastern Cape province of South Africa. A mixed methods approach was used to gather, collect and analyse data for this study. The data were collected through semi-structured in-depth interviews, focus groups discussions and a survey. The quantitative approach dominated in data collection, whilst the qualitative approach was used to corroborate the quantitative findings. For the quantitative approach, 265 questionnaires were administered to 121 volunteer participants targeting the station commanders, cluster commanders and sector commanders. A hundred and forty questionnaires were also administered to the Sector Crime Forum chairpersons who were selected using simple random sampling from 32 police stations. The sector commanders were used for in depth interviews. The rationale behind was that the sector commanders are playing a key role in the implementation of sector policing. Simple random sampling was used to select the participants. The study area was in the Eastern Cape, where the research sample and participants were drawn. The findings of the study indicated that although sector policing minimum standards have been achieved by many stations, the study found out that there are some stations that have not yet attained the policy goals in terms of optimal implementation of sector policing in the Eastern Cape Province. The study established that the farm and rural and remote police stations were not complying with the minimum standards laid down in the National Instruction 3/2009. The problem of non-compliance emanates from the shortages of resources. Further findings on this study were based on the experiences and challenges of the implementers of sector policing. The study found that there were challenges confronted by them in the implementation process. Although some of the participants were indicating their enjoying working closely with their communities, there were some major challenges that they experienced in the process of executing their duties. The results of the study indicate that resources were not adequate to ensure that this new policing strategy is properly executed. Another important finding which was identified by the study was the fact that sector policing, as a new policing strategy, was not adequately communicated and marketed for it to be accepted and to for it to achieve the necessary buy in from stakeholders. The study further established that training, development and capacity building were lacking to capacitate the implementers of the new policing strategy. Further, sector to sector collaboration was identified as another challenge by the study. Team work was very much limited. The study further revealed that command and control was not enhanced by the sector commanders in their sectors. The sector patrol reports were not available in the files and AVL reports were also not retrieved and monitored. The factors highlighted above have a negative bearing on the reduction of crime. Poor police visibility and stakeholder participation in crime prevention programmes are not reducing crime.
- Full Text:
- Date Issued: 2017
The influence of organisational culture on a high commitment work system and organisational commitment : the case of a Chinese multinational corporation in South Africa
- Authors: Mabuza, Linda Tengetile
- Date: 2015
- Subjects: Corporate culture -- South Africa , Corporate culture -- Cross-cultural studies , International business enterprises -- South Africa , Investments, Chinese -- South Africa , Organizational commitment -- South Africa , Performance -- Management , Host countries (Business) , Personnel management -- South Africa , South Africa -- Foreign economic relations -- China
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1205 , http://hdl.handle.net/10962/d1017768
- Description: Chinese presence in Africa has been rapidly increasing in the past few years and has been speculated to be mainly due to China seeking Africa’s political alliance and access to Africa’s natural resources and growing consumer markets. The growing presence of Chinese organisations in Africa, however, has not been without its challenges. In particular, Chinese multinational corporations (MNCs) in search of consumer markets in Africa have been cited as facing human resource (HR) challenges which may affect their organisational performance. In this regard, literature on human resource management has already established the important role of organisational culture, HR practices and organisational commitment in enabling organisations to achieve superior organisational performance. Given the fact that there is currently little research knowledge of Chinese presence in Africa at the organisational level, this research aimed to contribute empirical knowledge to the growing body of research in this area. Specifically, the main purpose of this research was to examine how the organisational culture of a Chinese MNC’s South African subsidiary has shaped the nature of its high commitment work system (HCWS) and to assess the consequences thereof on organisational commitment. In alignment with the phenomenological paradigm, the research applied a descriptive and explanatory case study methodology in order to generate rich, qualitative data which was required for in-depth descriptions and to uncover the underlying interactions of the researched phenomena at the subsidiary. The selected case for the research was, therefore, a Chinese MNC operating in the personal computer (PC) industry, which had expanded its operations to South Africa in order to reach Africa’s growing consumer markets. In particular, the South African subsidiary served as a PC sales and distribution organisation for the Chinese MNC. There were about 40 employees at the subsidiary who were all South African employees. Semi-structured, in-depth interviews were conducted with twelve employees from different job functions and across different job levels. Data collection was guided by the theoretical frameworks by Cameron and Freeman (1991) for organisational culture and Xiao and Bjorkman (2006) for the HCWS and organisational commitment. The data collected from interviews was then analysed through a qualitative, content analysis process. The findings of the research thus pointed to the market culture as the dominant organisational culture type at the South African subsidiary of the Chinese MNC; characteristics of the adhocracy and clan cultures were also discovered. The externally oriented market culture was found to be the most relevant for the high performance and market leadership aspirations of the subsidiary. The market culture also appears to be the most appropriate organisational culture that would enable the subsidiary to deal with the competitive nature of the PC industry. Furthermore, it was found that certain cultural values emphasised by the Confucian and Ubuntu value systems could have had a part to play in the formation of the subsidiary’s organisational culture. The market culture was also found to have had the greatest influence in shaping the primarily performance oriented HCWS practices. Of the investigated HR practices at the subsidiary, all were found to be consistent with HCWS practices, with the exception of ownership practices and the performance appraisal system. Finally, although there were generally high levels of organisational commitment reported at the subsidiary, other job and organisational context factors besides the HCWS practices were found to be the major contributors to those feelings of organisational commitment. By investigating the organisational culture, HCWS and organisational commitment of a Chinese MNC in South Africa, this research has added to the body of knowledge concerning the growing presence of Chinese organisations in Africa. Based on the empirical findings of this study, several recommendations have been made in an attempt to assist the Chinese MNC manage the organisational commitment of its South African employees towards superior organisational performance.
- Full Text:
- Date Issued: 2015
- Authors: Mabuza, Linda Tengetile
- Date: 2015
- Subjects: Corporate culture -- South Africa , Corporate culture -- Cross-cultural studies , International business enterprises -- South Africa , Investments, Chinese -- South Africa , Organizational commitment -- South Africa , Performance -- Management , Host countries (Business) , Personnel management -- South Africa , South Africa -- Foreign economic relations -- China
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1205 , http://hdl.handle.net/10962/d1017768
- Description: Chinese presence in Africa has been rapidly increasing in the past few years and has been speculated to be mainly due to China seeking Africa’s political alliance and access to Africa’s natural resources and growing consumer markets. The growing presence of Chinese organisations in Africa, however, has not been without its challenges. In particular, Chinese multinational corporations (MNCs) in search of consumer markets in Africa have been cited as facing human resource (HR) challenges which may affect their organisational performance. In this regard, literature on human resource management has already established the important role of organisational culture, HR practices and organisational commitment in enabling organisations to achieve superior organisational performance. Given the fact that there is currently little research knowledge of Chinese presence in Africa at the organisational level, this research aimed to contribute empirical knowledge to the growing body of research in this area. Specifically, the main purpose of this research was to examine how the organisational culture of a Chinese MNC’s South African subsidiary has shaped the nature of its high commitment work system (HCWS) and to assess the consequences thereof on organisational commitment. In alignment with the phenomenological paradigm, the research applied a descriptive and explanatory case study methodology in order to generate rich, qualitative data which was required for in-depth descriptions and to uncover the underlying interactions of the researched phenomena at the subsidiary. The selected case for the research was, therefore, a Chinese MNC operating in the personal computer (PC) industry, which had expanded its operations to South Africa in order to reach Africa’s growing consumer markets. In particular, the South African subsidiary served as a PC sales and distribution organisation for the Chinese MNC. There were about 40 employees at the subsidiary who were all South African employees. Semi-structured, in-depth interviews were conducted with twelve employees from different job functions and across different job levels. Data collection was guided by the theoretical frameworks by Cameron and Freeman (1991) for organisational culture and Xiao and Bjorkman (2006) for the HCWS and organisational commitment. The data collected from interviews was then analysed through a qualitative, content analysis process. The findings of the research thus pointed to the market culture as the dominant organisational culture type at the South African subsidiary of the Chinese MNC; characteristics of the adhocracy and clan cultures were also discovered. The externally oriented market culture was found to be the most relevant for the high performance and market leadership aspirations of the subsidiary. The market culture also appears to be the most appropriate organisational culture that would enable the subsidiary to deal with the competitive nature of the PC industry. Furthermore, it was found that certain cultural values emphasised by the Confucian and Ubuntu value systems could have had a part to play in the formation of the subsidiary’s organisational culture. The market culture was also found to have had the greatest influence in shaping the primarily performance oriented HCWS practices. Of the investigated HR practices at the subsidiary, all were found to be consistent with HCWS practices, with the exception of ownership practices and the performance appraisal system. Finally, although there were generally high levels of organisational commitment reported at the subsidiary, other job and organisational context factors besides the HCWS practices were found to be the major contributors to those feelings of organisational commitment. By investigating the organisational culture, HCWS and organisational commitment of a Chinese MNC in South Africa, this research has added to the body of knowledge concerning the growing presence of Chinese organisations in Africa. Based on the empirical findings of this study, several recommendations have been made in an attempt to assist the Chinese MNC manage the organisational commitment of its South African employees towards superior organisational performance.
- Full Text:
- Date Issued: 2015
Social policy, welfare in urban services in South Africa : a case study of free basic water, indigency and citizenship in Eastwood, Pietermaritzburg, KwaZulu-Natal (2005-2007)
- Authors: Smith, Julie
- Date: 2009
- Subjects: Municipal water supply -- South Africa -- Pietermaritzburg , Water-supply -- Social aspects -- South Africa -- Pietermaritzburg , Poor -- South Africa -- Pietermaritzburg , Water-supply -- Economic aspects -- South Africa , South Africa -- Social policy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6060 , http://hdl.handle.net/10962/d1015231
- Description: This is an in-depth case study of urban water services to poor households and their interactions with local state power in the community of Eastwood, Pietermaritzburg, in the province of KwaZulu-Natal, South Africa, for the period 2005-2007. It draws especially on the experiences of poor women, exploring the conceptions and implications of the movement of municipal services into the realm of welfare-based urban service concessions. It interrogates what value municipal services, framed in the language and form of welfare but within a commodification milieu and in the context of shifting citizen-state relations offer the state apparatus and how such free basic service offerings are experienced by poor households at the level of domestic, social and economic functioning. The study adopts a fluid mixed-methodological approach to optimise exploration and interpretation. It argues that the interface of state service delivery and citizens is fraught with contradictions: core to this is the nature of state ' help.' Free basic water encompassed in the social wage did not improve the lives of poor households; instead it eroded original water access. Free basic water stole women's time spent on domestic activities; compromised appropriate water requirements, exacerbated service affordability problems and negatively affected household functioning. Poor households experienced the government's policy of free basic services as containment and punishment for being poor. The Indigent Policy activated the state's surveillance, disciplinary and control apparatus. In the absence of effective national regulation over municipalities and with financial shortfalls, street-level bureaucrats manipulated social policies to further municipal cost recovery goals and subjugate poor households. Social control and cheap governance were in symmetry. Citizens, desperate for relief, approached the state. Poor households were pushed into downgraded service packages or mercilessly pursued by municipally outsourced private debt collectors and disconnection companies. Municipalities competing for investments brought about by favourable credit ratings abandoned the humanity of their citizens. Such re-prioritisation of values had profound implications for governance and public trust. Citizens were jettisoned to the outskirts of municipal governance, resulting in a distinct confusion and anger towards the local state - and with it, major uncertainties regarding future stability, redistribution and equity.
- Full Text:
- Date Issued: 2009
- Authors: Smith, Julie
- Date: 2009
- Subjects: Municipal water supply -- South Africa -- Pietermaritzburg , Water-supply -- Social aspects -- South Africa -- Pietermaritzburg , Poor -- South Africa -- Pietermaritzburg , Water-supply -- Economic aspects -- South Africa , South Africa -- Social policy
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6060 , http://hdl.handle.net/10962/d1015231
- Description: This is an in-depth case study of urban water services to poor households and their interactions with local state power in the community of Eastwood, Pietermaritzburg, in the province of KwaZulu-Natal, South Africa, for the period 2005-2007. It draws especially on the experiences of poor women, exploring the conceptions and implications of the movement of municipal services into the realm of welfare-based urban service concessions. It interrogates what value municipal services, framed in the language and form of welfare but within a commodification milieu and in the context of shifting citizen-state relations offer the state apparatus and how such free basic service offerings are experienced by poor households at the level of domestic, social and economic functioning. The study adopts a fluid mixed-methodological approach to optimise exploration and interpretation. It argues that the interface of state service delivery and citizens is fraught with contradictions: core to this is the nature of state ' help.' Free basic water encompassed in the social wage did not improve the lives of poor households; instead it eroded original water access. Free basic water stole women's time spent on domestic activities; compromised appropriate water requirements, exacerbated service affordability problems and negatively affected household functioning. Poor households experienced the government's policy of free basic services as containment and punishment for being poor. The Indigent Policy activated the state's surveillance, disciplinary and control apparatus. In the absence of effective national regulation over municipalities and with financial shortfalls, street-level bureaucrats manipulated social policies to further municipal cost recovery goals and subjugate poor households. Social control and cheap governance were in symmetry. Citizens, desperate for relief, approached the state. Poor households were pushed into downgraded service packages or mercilessly pursued by municipally outsourced private debt collectors and disconnection companies. Municipalities competing for investments brought about by favourable credit ratings abandoned the humanity of their citizens. Such re-prioritisation of values had profound implications for governance and public trust. Citizens were jettisoned to the outskirts of municipal governance, resulting in a distinct confusion and anger towards the local state - and with it, major uncertainties regarding future stability, redistribution and equity.
- Full Text:
- Date Issued: 2009
"Freelance mystic": individuation, mythopoeia and metafiction in the early fiction of Russell Hoban
- Authors: Rumbold, Matthew Ivan
- Date: 2007 , 2013-06-26
- Subjects: Hoban, Russell -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2257 , http://hdl.handle.net/10962/d1004455
- Description: This thesis is an exploration of three interrelated modes - the psychological, the religious or mythopoeic, and the metafictional - in the early novels of Russell Hoban. It investigates the relationship between Hoban's religious vision and his literary style, through the lens of his 'fictional philosophy' as it is presented in his essay collection The Moment under the Moment. In Chapter One, Kleinzeit is analysed to illustrate Hoban's portrayal of a contemporary crisis of meaning. It includes an introduction to the pattern of individuation and an exposition of Hoban's unique notion of heroism as embodied in Kleinzeit's journey of self-discovery. Hoban's mythopoeic impulse is elucidated with particular reference to his use of the Orpheus and Eurydice myth. Finally, in an attempt to demonstrate Hoban's ideas on the relationship between language and reality, various metafictional techniques are examined, especially in relation to the theme of transcendence. In Chapter Two, the individuation theme in The Medusa Frequenry is considered as a work of mourning, portraying Herman Orfrs movement towards reconciliation and creative renewal. Following Paul Ricoeur, the Orpheus and Eurydice myth is seen as a myth of fault, embodying a primal transgression, and a source of the creative arts. The metafictional style is examined, especially the narrative mode, in order to show how Hoban dissolves the everyday world of reality into a fantastic realm of myth. Chapter Three focuses on the individuation pattern as initiation in Riddley Walker, charting the hero's growth into adulthood. Various myths in the text are analysed to show how they portray human development and the nuclear catastrophe as a mythic Fall. The chapter argues that through Riddley's quest Hoban evokes a redemptive and regenerative fertility myth. The unique literary style of the novel, including the characteristics of 'Riddleyspeak' and the complexity of the process of interpretation is studied. In Chapter Four, which deals with Pilgermann, the final phase of individuation - preparation for death - is discussed. Hoban's religious vision is dissected in relation to his mystical impulse as exemplified in the construction of the Hidden Lion pattern. Hoban's notion of God is investigated in relation to the philosophical problem of evil and suffering. Finally, Pilger mann is shown to be Hoban's mOSt experimental literary novel as it activates his recurring meta fictional techniques, investigations into narrative, and the relationship between language and the sacred. This thesis concludes that Hoban's fiction is best understood holistically with both his religious and literary concerns inextricably entwined. Throughout his novels Hoban explores the human condition in modernity affirming the paradoxical, dialectical and mysterious nature of being. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2007
- Authors: Rumbold, Matthew Ivan
- Date: 2007 , 2013-06-26
- Subjects: Hoban, Russell -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2257 , http://hdl.handle.net/10962/d1004455
- Description: This thesis is an exploration of three interrelated modes - the psychological, the religious or mythopoeic, and the metafictional - in the early novels of Russell Hoban. It investigates the relationship between Hoban's religious vision and his literary style, through the lens of his 'fictional philosophy' as it is presented in his essay collection The Moment under the Moment. In Chapter One, Kleinzeit is analysed to illustrate Hoban's portrayal of a contemporary crisis of meaning. It includes an introduction to the pattern of individuation and an exposition of Hoban's unique notion of heroism as embodied in Kleinzeit's journey of self-discovery. Hoban's mythopoeic impulse is elucidated with particular reference to his use of the Orpheus and Eurydice myth. Finally, in an attempt to demonstrate Hoban's ideas on the relationship between language and reality, various metafictional techniques are examined, especially in relation to the theme of transcendence. In Chapter Two, the individuation theme in The Medusa Frequenry is considered as a work of mourning, portraying Herman Orfrs movement towards reconciliation and creative renewal. Following Paul Ricoeur, the Orpheus and Eurydice myth is seen as a myth of fault, embodying a primal transgression, and a source of the creative arts. The metafictional style is examined, especially the narrative mode, in order to show how Hoban dissolves the everyday world of reality into a fantastic realm of myth. Chapter Three focuses on the individuation pattern as initiation in Riddley Walker, charting the hero's growth into adulthood. Various myths in the text are analysed to show how they portray human development and the nuclear catastrophe as a mythic Fall. The chapter argues that through Riddley's quest Hoban evokes a redemptive and regenerative fertility myth. The unique literary style of the novel, including the characteristics of 'Riddleyspeak' and the complexity of the process of interpretation is studied. In Chapter Four, which deals with Pilgermann, the final phase of individuation - preparation for death - is discussed. Hoban's religious vision is dissected in relation to his mystical impulse as exemplified in the construction of the Hidden Lion pattern. Hoban's notion of God is investigated in relation to the philosophical problem of evil and suffering. Finally, Pilger mann is shown to be Hoban's mOSt experimental literary novel as it activates his recurring meta fictional techniques, investigations into narrative, and the relationship between language and the sacred. This thesis concludes that Hoban's fiction is best understood holistically with both his religious and literary concerns inextricably entwined. Throughout his novels Hoban explores the human condition in modernity affirming the paradoxical, dialectical and mysterious nature of being. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2007
A global ionospheric F2 region peak electron density model using neural networks and extended geophysically relevant inputs
- Authors: Oyeyemi, Elijah Oyedola
- Date: 2006
- Subjects: Neural networks (Computer science) Ionospheric electron density Ionosphere Ionosphere -- Mathematical models
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5470 , http://hdl.handle.net/10962/d1005255
- Description: This thesis presents my research on the development of a neural network (NN) based global empirical model of the ionospheric F2 region peak electron density using extended geophysically relevant inputs. The main principle behind this approach has been to utilize parameters other than simple geographic co-ordinates, on which the F2 peak electron density is known to depend, and to exploit the technique of NNs, thereby establishing and modeling the non-linear dynamic processes (both in space and time)associated with the F2 region electron density on a global scale. Four different models have been developed in this work. These are the foF2 NN model, M(3000)F2 NN model, short-term forecasting foF2 NN, and a near-real time foF2 NN model. Data used in the training of the NNs were obtained from the worldwide ionosonde stations spanning the period 1964 to 1986 based on availability, which included all periods of calm and disturbed magnetic activity. Common input parameters used in the training of all 4 models are day number (day of the year, DN), Universal Time (UT), a 2 month running mean of the sunspot number (R2), a 2 day running mean of the 3-hour planetary magnetic index ap (A16), solar zenith angle (CHI), geographic latitude (q), magnetic dip angle (I), angle of magnetic declination (D), angle of meridian relative to subsolar point (M). For the short-term and near-real time foF2 models, additional input parameters related to recent past observations of foF2 itself were included in the training of the NNs. The results of the foF2 NN model and M(3000)F2 NN model presented in this work, which compare favourably with the IRI (International Reference Ionosphere) model successfully demonstrate the potential of NNs for spatial and temporal modeling of the ionospheric parameters foF2 and M(3000)F2 globally. The results obtained from the short-term foF2 NN model and nearreal time foF2 NN model reveal that, in addition to the temporal and spatial input variables, short-term forecasting of foF2 is much improved by including past observations of foF2 itself. Results obtained from the near-real time foF2 NN model also reveal that there exists a correlation between measured foF2 values at different locations across the globe. Again, comparisons of the foF2 NN model and M(3000)F2 NN model predictions with that of the IRI model predictions and observed values at some selected high latitude stations, suggest that the NN technique can successfully be employed to model the complex irregularities associated with the high latitude regions. Based on the results obtained in this research and the comparison made with the IRI model (URSI and CCIR coefficients), these results justify consideration of the NN technique for the prediction of global ionospheric parameters. I believe that, after consideration by the IRI community, these models will prove to be valuable to both the high frequency (HF) communication and worldwide ionospheric communities.
- Full Text:
- Date Issued: 2006
- Authors: Oyeyemi, Elijah Oyedola
- Date: 2006
- Subjects: Neural networks (Computer science) Ionospheric electron density Ionosphere Ionosphere -- Mathematical models
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5470 , http://hdl.handle.net/10962/d1005255
- Description: This thesis presents my research on the development of a neural network (NN) based global empirical model of the ionospheric F2 region peak electron density using extended geophysically relevant inputs. The main principle behind this approach has been to utilize parameters other than simple geographic co-ordinates, on which the F2 peak electron density is known to depend, and to exploit the technique of NNs, thereby establishing and modeling the non-linear dynamic processes (both in space and time)associated with the F2 region electron density on a global scale. Four different models have been developed in this work. These are the foF2 NN model, M(3000)F2 NN model, short-term forecasting foF2 NN, and a near-real time foF2 NN model. Data used in the training of the NNs were obtained from the worldwide ionosonde stations spanning the period 1964 to 1986 based on availability, which included all periods of calm and disturbed magnetic activity. Common input parameters used in the training of all 4 models are day number (day of the year, DN), Universal Time (UT), a 2 month running mean of the sunspot number (R2), a 2 day running mean of the 3-hour planetary magnetic index ap (A16), solar zenith angle (CHI), geographic latitude (q), magnetic dip angle (I), angle of magnetic declination (D), angle of meridian relative to subsolar point (M). For the short-term and near-real time foF2 models, additional input parameters related to recent past observations of foF2 itself were included in the training of the NNs. The results of the foF2 NN model and M(3000)F2 NN model presented in this work, which compare favourably with the IRI (International Reference Ionosphere) model successfully demonstrate the potential of NNs for spatial and temporal modeling of the ionospheric parameters foF2 and M(3000)F2 globally. The results obtained from the short-term foF2 NN model and nearreal time foF2 NN model reveal that, in addition to the temporal and spatial input variables, short-term forecasting of foF2 is much improved by including past observations of foF2 itself. Results obtained from the near-real time foF2 NN model also reveal that there exists a correlation between measured foF2 values at different locations across the globe. Again, comparisons of the foF2 NN model and M(3000)F2 NN model predictions with that of the IRI model predictions and observed values at some selected high latitude stations, suggest that the NN technique can successfully be employed to model the complex irregularities associated with the high latitude regions. Based on the results obtained in this research and the comparison made with the IRI model (URSI and CCIR coefficients), these results justify consideration of the NN technique for the prediction of global ionospheric parameters. I believe that, after consideration by the IRI community, these models will prove to be valuable to both the high frequency (HF) communication and worldwide ionospheric communities.
- Full Text:
- Date Issued: 2006
Biogeography and community structure of fishes in South African estuaries
- Authors: Harrison, Trevor D
- Date: 2003
- Subjects: Estuarine ecology -- South Africa Estuarine fishes -- South Africa Fish communities -- South Africa Biogeography -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5235 , http://hdl.handle.net/10962/d1005078
- Description: The biogeography and community structure of the fishes of South African estuaries was investigated. In all, 109 systems were examined representing two broad types: temporarily closed and permanently open estuaries. Multivariate analyses of the fish communities identified three biogeographic regions. A cool-temperate region extended along the west and southwest coasts; a warmtemperate zone stretched along the south, southeast and east coasts and a subtropical region occurred along the east coast. The boundaries of these biogeographic regions were also delineated. The general physico-chemical characteristics of the estuaries within the three biogeographic regions also reflected regional differences in climate, rainfall and ocean conditions. Estuarine temperatures followed the trend for marine coastal waters, decreasing from subtropical estuaries toward cool-temperate systems. The low rainfall and runoff in the warm-temperate region together with high evaporation rates and strong seawater input resulted in higher salinities in these estuaries. These factors also accounted for the predominantly clearer waters in warm-temperate estuaries. The estuaries in the three biogeographic regions were also shown to contain somewhat distinctive fish assemblages. Temperature and salinity appeared to be the two main factors affecting the distribution and abundance of fishes in South African estuaries. Subtropical systems were characterised by fishes mostly of tropical origin as well as certain south coast endemic species. Warm-temperate estuaries were dominated by endemic taxa with some tropical species also present. The fish fauna of cooltemperate estuaries mostly comprised south coast endemic species with cosmopolitan and temperate taxa also present. Certain functional components of the ichthyofauna also exhibited slight differences between regions. Freshwater fishes were a major component of closed subtropical estuaries while estuarine resident species were more abundant in warm-temperate estuaries. Overall, estuarine-dependent marine species dominated the fish fauna of the estuaries in all biogeographic regions, signifying that South African estuaries perform a vital nursery function for this group of fishes. Slight differences were also apparent in the trophic structure of the fishes; these were related to environmental differences between regions. Zooplanktivores and fishes that feed on aquatic macrophytes/invertebrates assumed a relatively higher importance in warm-temperate systems. Overall, detritivores dominated the estuarine fish fauna in all regions, indicating that detritus forms the main energy source in South African estuaries.
- Full Text:
- Date Issued: 2003
- Authors: Harrison, Trevor D
- Date: 2003
- Subjects: Estuarine ecology -- South Africa Estuarine fishes -- South Africa Fish communities -- South Africa Biogeography -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5235 , http://hdl.handle.net/10962/d1005078
- Description: The biogeography and community structure of the fishes of South African estuaries was investigated. In all, 109 systems were examined representing two broad types: temporarily closed and permanently open estuaries. Multivariate analyses of the fish communities identified three biogeographic regions. A cool-temperate region extended along the west and southwest coasts; a warmtemperate zone stretched along the south, southeast and east coasts and a subtropical region occurred along the east coast. The boundaries of these biogeographic regions were also delineated. The general physico-chemical characteristics of the estuaries within the three biogeographic regions also reflected regional differences in climate, rainfall and ocean conditions. Estuarine temperatures followed the trend for marine coastal waters, decreasing from subtropical estuaries toward cool-temperate systems. The low rainfall and runoff in the warm-temperate region together with high evaporation rates and strong seawater input resulted in higher salinities in these estuaries. These factors also accounted for the predominantly clearer waters in warm-temperate estuaries. The estuaries in the three biogeographic regions were also shown to contain somewhat distinctive fish assemblages. Temperature and salinity appeared to be the two main factors affecting the distribution and abundance of fishes in South African estuaries. Subtropical systems were characterised by fishes mostly of tropical origin as well as certain south coast endemic species. Warm-temperate estuaries were dominated by endemic taxa with some tropical species also present. The fish fauna of cooltemperate estuaries mostly comprised south coast endemic species with cosmopolitan and temperate taxa also present. Certain functional components of the ichthyofauna also exhibited slight differences between regions. Freshwater fishes were a major component of closed subtropical estuaries while estuarine resident species were more abundant in warm-temperate estuaries. Overall, estuarine-dependent marine species dominated the fish fauna of the estuaries in all biogeographic regions, signifying that South African estuaries perform a vital nursery function for this group of fishes. Slight differences were also apparent in the trophic structure of the fishes; these were related to environmental differences between regions. Zooplanktivores and fishes that feed on aquatic macrophytes/invertebrates assumed a relatively higher importance in warm-temperate systems. Overall, detritivores dominated the estuarine fish fauna in all regions, indicating that detritus forms the main energy source in South African estuaries.
- Full Text:
- Date Issued: 2003
Feeding ecology of Bathyclarias nyasensis (Siluroidei: Claridae) from Lake Malawi
- Kaunda, Emmanuel Kamlipe Watson Hawkins
- Authors: Kaunda, Emmanuel Kamlipe Watson Hawkins
- Date: 2001
- Subjects: Fishes -- Malawi Fishes -- Nyasa, Lake
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5282 , http://hdl.handle.net/10962/d1005126
- Description: In Malawi, fish contribute about 60-80% to the country's animal protein supply. The greater proportion (> 50%) comes from Lake Malawi. Bathyclarias nyasensis and other clariid catfish contribute up to > 20% of the total catches. Catches of Bathyclarias nyasensis in the inshore area of the south-east arm of Lake Malawi are declining and a management plan for the fishery is essentially lacking. There is paucity of biological data that precludes the use of any option to manage the species. The principal aim of the thesis was to define the ecological role B. nyasensis, the most abundant and common of the Bathyclarias species. By examining life history characteristics within a food web context, it was hypothesized that the study would provide an insight into the interrelationships between species, and, hence form the basis for the development of a rational exploitation strategy for the species. The study was undertaken in the south-east arm of Lake Malawi (9° 30'S, 14° 30'S). The principal objectives of the study were to investigate the feeding ecology of B. nyasensis by examining morphological characters and structures associated with feeding, diet of B. nyasensis, food assimilated in the species using carbon (∂¹³C) isotope analysis, daily food consumption rate for B. nyasensis; and to relate the feeding ecology to life history traits such as age, growth, and some aspects of the reproductive biology of B. nyasensis. The suitability of sectioned pectoral spines and sagittal otoliths to age B. nyasensis was assessed. Due to reabsorption of growth zones with increasing spine lumen diameter with fish size, and the relatively low number of spines that could be aged reliably, only otoliths were used. The maximum age for B. nyasensis was estimated at 14 vears. Growth was best was described by the four parameter Schnute mc: lt ={42+(81¹·⁸ - 42¹·⁸)x1-e⁻°·°⁵⁽t⁻¹⁾}¹/¹·⁸ over 1-e⁻⁽⁻°·°⁵⁾⁽¹¹⁾ for female, lt={41+(98¹·² - 41¹·²)x 1-e⁻°·°²⁽t⁻¹⁾}¹/¹·² over 1-e⁻⁽⁻°·°²⁾⁽¹³⁾ and for male fish. Age-at-50% maturity for females and males were estimated at 7 years and 4 years, respectively. Typically, fish grew rapidly in the first year, but slower during subsequent years. Smaller fish were found inshore while larger fish were found in offshore regions. It was hypothesised that the rapid growth in the first year and slower growth later is a consequence of change in diet from high quality and abundant food source to a more dilute food and that this may be associated with a shift in habitat. Morphological characters associated with feeding were used to predict the food and feeding behaviour of B. nyasensis. The size of premaxillary, vomerine, pharyngeal dental and palatine teeth and premaxillary and vomerine tooth plates suggested the capability of B. nyasensis to handle both large and small prey, with a propensity towards smaller prey in composition to C. gariepinus. The molariform teeth on the vomerine tooth plate suggested that molluscs form part of the diet. The relative gut length (1.27±0.24) suggested omnivory, with an ability to switch between planktivory and piscivory. Buccal cavity volume and filtering area changed with fish size at 500-600 mm TL upon which it was hypothesised that the fish diet changed to planktivory at this size. Detailed diet analysis provided information upon which the above hypotheses could be accepted. Percent Index of Relative Importance (%IRI) and a multi-way contingency table analysis based on log-linear models were used to analyse diet data. Results showed that B. nyasensis is omnivorous, but with a distinct ontogenetic dietary shift from piscivory to zooplanktivory at 500 - 600 mm TL. The increased buccal cavity volume at the same fish size therefore, suggests that B. nyasensis is well adapted to filter the dilute zooplankton resource. Increased foraging costs of feeding on zooplankton explained the slower growth of larger fish. The dietary shift was finally corroborated by results of the ∂¹³C isotope analysis. A polynomial equation described the change in carbon ratios with fish size: ∂¹³C = - 33.188 + 0.4997L - 0.0045 (total length)² (r² = 0.598, n = 12, p=0.022). The ontogenetic shift in diet was synchronised with a habitat shift postulated in life history studies. In the inshore region, B. nyasensis were predominantly piscivorous (apex predators), and were zooplanktivorous in the offshore region, thereby forming part of the pelagic food web in the latter region. After examining "bottom-up" and trophic cascade theories, it was postulated that perturbations of the B. nyasensis stock would be discernible both at the top and lower trophic levels. As a piscivore and therefore apex predator, effects of overfishing B. nyasensis in the inshore region could cascade to unpredictable ecological changes in inshore areas and, due to the ontogenetic habitat shift, in the offshore regions. Examples of trophic cascade phenomena are provided. On the basis of the feeding study, it was possible to reconstruct the pelagic food web of Lake Malawi. Apart from the lakefly Chaoborus edulis, B. nyasensis is the other predator that preys heavily on zooplankton in the pelagic zone. Perturbations of the B. nyasensis stock could affect size composition of zooplankton which in tum, could affect production of C. edulis, a resource for the top predators in the food web. The findings of the present study contributed to the ongoing debate of introducing a zooplanktivore into the pelagic zone of Lake Malawi. Proponents for the introductions have argued that zooplankton predation by fish is inferior to that of C. edulis. Introduction of a clupeid zooplankton was proposed as a strategy to boost fish production in the lake. The zooplanktivore would either out-compete or prey on C. edulis to extinction. Opponents to this view argued that zooplankton biomass in the pelagic region was too low to support introductions and that the fish biomass in the pelagic region may have been underestimated. Results from the present study suggest that planktivorous fish (including B. nyasensis) might not be inferior to C. edulis in utilising the zooplankton resource; B. nyasensis is well adapted to utilise the dilute zooplankton resource, and by omitting B. nyasensis from previous studies, overall zooplankton predation by fish may have been underestimated by between 7 - 33%. On the basis of the theoretical migratory life history cycle of B. nyasensis, it is recommended that the current interest in increasing fishing effort in offshore areas should proceed with caution. Ecological changes that may have occurred in the inshore areas due to overfishing have probably not been noticed: as the offshore zone has never been fished. The latter zone may have acted as a stock refuge area. Higher fishing intensity in the offshore areas could lead to serious ecological imbalances and instability. The study has shown that life history characteristics studied in the context of the food web, and in the absence of other fisheries information and/or data, strongly advocates the precautionary principle to managing changes in exploitation patterns.
- Full Text:
- Date Issued: 2001
- Authors: Kaunda, Emmanuel Kamlipe Watson Hawkins
- Date: 2001
- Subjects: Fishes -- Malawi Fishes -- Nyasa, Lake
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5282 , http://hdl.handle.net/10962/d1005126
- Description: In Malawi, fish contribute about 60-80% to the country's animal protein supply. The greater proportion (> 50%) comes from Lake Malawi. Bathyclarias nyasensis and other clariid catfish contribute up to > 20% of the total catches. Catches of Bathyclarias nyasensis in the inshore area of the south-east arm of Lake Malawi are declining and a management plan for the fishery is essentially lacking. There is paucity of biological data that precludes the use of any option to manage the species. The principal aim of the thesis was to define the ecological role B. nyasensis, the most abundant and common of the Bathyclarias species. By examining life history characteristics within a food web context, it was hypothesized that the study would provide an insight into the interrelationships between species, and, hence form the basis for the development of a rational exploitation strategy for the species. The study was undertaken in the south-east arm of Lake Malawi (9° 30'S, 14° 30'S). The principal objectives of the study were to investigate the feeding ecology of B. nyasensis by examining morphological characters and structures associated with feeding, diet of B. nyasensis, food assimilated in the species using carbon (∂¹³C) isotope analysis, daily food consumption rate for B. nyasensis; and to relate the feeding ecology to life history traits such as age, growth, and some aspects of the reproductive biology of B. nyasensis. The suitability of sectioned pectoral spines and sagittal otoliths to age B. nyasensis was assessed. Due to reabsorption of growth zones with increasing spine lumen diameter with fish size, and the relatively low number of spines that could be aged reliably, only otoliths were used. The maximum age for B. nyasensis was estimated at 14 vears. Growth was best was described by the four parameter Schnute mc: lt ={42+(81¹·⁸ - 42¹·⁸)x1-e⁻°·°⁵⁽t⁻¹⁾}¹/¹·⁸ over 1-e⁻⁽⁻°·°⁵⁾⁽¹¹⁾ for female, lt={41+(98¹·² - 41¹·²)x 1-e⁻°·°²⁽t⁻¹⁾}¹/¹·² over 1-e⁻⁽⁻°·°²⁾⁽¹³⁾ and for male fish. Age-at-50% maturity for females and males were estimated at 7 years and 4 years, respectively. Typically, fish grew rapidly in the first year, but slower during subsequent years. Smaller fish were found inshore while larger fish were found in offshore regions. It was hypothesised that the rapid growth in the first year and slower growth later is a consequence of change in diet from high quality and abundant food source to a more dilute food and that this may be associated with a shift in habitat. Morphological characters associated with feeding were used to predict the food and feeding behaviour of B. nyasensis. The size of premaxillary, vomerine, pharyngeal dental and palatine teeth and premaxillary and vomerine tooth plates suggested the capability of B. nyasensis to handle both large and small prey, with a propensity towards smaller prey in composition to C. gariepinus. The molariform teeth on the vomerine tooth plate suggested that molluscs form part of the diet. The relative gut length (1.27±0.24) suggested omnivory, with an ability to switch between planktivory and piscivory. Buccal cavity volume and filtering area changed with fish size at 500-600 mm TL upon which it was hypothesised that the fish diet changed to planktivory at this size. Detailed diet analysis provided information upon which the above hypotheses could be accepted. Percent Index of Relative Importance (%IRI) and a multi-way contingency table analysis based on log-linear models were used to analyse diet data. Results showed that B. nyasensis is omnivorous, but with a distinct ontogenetic dietary shift from piscivory to zooplanktivory at 500 - 600 mm TL. The increased buccal cavity volume at the same fish size therefore, suggests that B. nyasensis is well adapted to filter the dilute zooplankton resource. Increased foraging costs of feeding on zooplankton explained the slower growth of larger fish. The dietary shift was finally corroborated by results of the ∂¹³C isotope analysis. A polynomial equation described the change in carbon ratios with fish size: ∂¹³C = - 33.188 + 0.4997L - 0.0045 (total length)² (r² = 0.598, n = 12, p=0.022). The ontogenetic shift in diet was synchronised with a habitat shift postulated in life history studies. In the inshore region, B. nyasensis were predominantly piscivorous (apex predators), and were zooplanktivorous in the offshore region, thereby forming part of the pelagic food web in the latter region. After examining "bottom-up" and trophic cascade theories, it was postulated that perturbations of the B. nyasensis stock would be discernible both at the top and lower trophic levels. As a piscivore and therefore apex predator, effects of overfishing B. nyasensis in the inshore region could cascade to unpredictable ecological changes in inshore areas and, due to the ontogenetic habitat shift, in the offshore regions. Examples of trophic cascade phenomena are provided. On the basis of the feeding study, it was possible to reconstruct the pelagic food web of Lake Malawi. Apart from the lakefly Chaoborus edulis, B. nyasensis is the other predator that preys heavily on zooplankton in the pelagic zone. Perturbations of the B. nyasensis stock could affect size composition of zooplankton which in tum, could affect production of C. edulis, a resource for the top predators in the food web. The findings of the present study contributed to the ongoing debate of introducing a zooplanktivore into the pelagic zone of Lake Malawi. Proponents for the introductions have argued that zooplankton predation by fish is inferior to that of C. edulis. Introduction of a clupeid zooplankton was proposed as a strategy to boost fish production in the lake. The zooplanktivore would either out-compete or prey on C. edulis to extinction. Opponents to this view argued that zooplankton biomass in the pelagic region was too low to support introductions and that the fish biomass in the pelagic region may have been underestimated. Results from the present study suggest that planktivorous fish (including B. nyasensis) might not be inferior to C. edulis in utilising the zooplankton resource; B. nyasensis is well adapted to utilise the dilute zooplankton resource, and by omitting B. nyasensis from previous studies, overall zooplankton predation by fish may have been underestimated by between 7 - 33%. On the basis of the theoretical migratory life history cycle of B. nyasensis, it is recommended that the current interest in increasing fishing effort in offshore areas should proceed with caution. Ecological changes that may have occurred in the inshore areas due to overfishing have probably not been noticed: as the offshore zone has never been fished. The latter zone may have acted as a stock refuge area. Higher fishing intensity in the offshore areas could lead to serious ecological imbalances and instability. The study has shown that life history characteristics studied in the context of the food web, and in the absence of other fisheries information and/or data, strongly advocates the precautionary principle to managing changes in exploitation patterns.
- Full Text:
- Date Issued: 2001
An analysis of the structural use of music, song and dance in certain novels by West African writers in relation to concepts of time
- Authors: Baxter, Marion
- Date: 1988
- Subjects: Music and literature
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2174 , http://hdl.handle.net/10962/d1001825
- Description: The topic of this thesis is time in the West African novel in English and French, and the key approach is that West African time is readily grasped through a study of West African music. Though Western time is not exclusively or only linear, mechanical and exploitative, and African time not exclusively cyclic, synchronic and experiential, yet there is a characteristically African view of time and preferred modes of its employment in West African fiction. The novelists considered here wrote in European languages, yet each was a member of a specific cultural group and concerned to portray the aesthetics of his inheritance, an important aspect of which is the predominance of repetitive formulae, both in music and in oral literature. The Introduction offers an historical survey of some of the main notions of time that have been manifest in the West, and compares them with notions of African time. Chapter One examines the structural use of rhythm and repetition in the novels of Camara Laye. Chapter Two discusses the griot and other traditions of oral literature in the novels of Ayi Kwei Armah and Yambo Ouologuem, novels which are concerned with the griot 's continuing role in the creation and dissemination of historical perspective. Chapter Three analyses Chinua Achebe 's portrayal of the values of pre-colonial life in Igbo society where the role of music is to limit behaviour through the structures of ritual which thus create static/cyclic time. Chapter Four describes the syncretic art-form, 'highlife', as used by novelists such as Wole Soyinka, which, because it is transitory and always changing, underscores the ironies of modern city life. The thesis concludes that the authors discussed above are aware that music, because it is predominantly social in Africa, is a powerful medium for achieving a healing synthesis between the traditional past when communalistic values were binding, and the urban-orientated present with its insistence on individuation and material enrichment.
- Full Text:
- Date Issued: 1988
- Authors: Baxter, Marion
- Date: 1988
- Subjects: Music and literature
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2174 , http://hdl.handle.net/10962/d1001825
- Description: The topic of this thesis is time in the West African novel in English and French, and the key approach is that West African time is readily grasped through a study of West African music. Though Western time is not exclusively or only linear, mechanical and exploitative, and African time not exclusively cyclic, synchronic and experiential, yet there is a characteristically African view of time and preferred modes of its employment in West African fiction. The novelists considered here wrote in European languages, yet each was a member of a specific cultural group and concerned to portray the aesthetics of his inheritance, an important aspect of which is the predominance of repetitive formulae, both in music and in oral literature. The Introduction offers an historical survey of some of the main notions of time that have been manifest in the West, and compares them with notions of African time. Chapter One examines the structural use of rhythm and repetition in the novels of Camara Laye. Chapter Two discusses the griot and other traditions of oral literature in the novels of Ayi Kwei Armah and Yambo Ouologuem, novels which are concerned with the griot 's continuing role in the creation and dissemination of historical perspective. Chapter Three analyses Chinua Achebe 's portrayal of the values of pre-colonial life in Igbo society where the role of music is to limit behaviour through the structures of ritual which thus create static/cyclic time. Chapter Four describes the syncretic art-form, 'highlife', as used by novelists such as Wole Soyinka, which, because it is transitory and always changing, underscores the ironies of modern city life. The thesis concludes that the authors discussed above are aware that music, because it is predominantly social in Africa, is a powerful medium for achieving a healing synthesis between the traditional past when communalistic values were binding, and the urban-orientated present with its insistence on individuation and material enrichment.
- Full Text:
- Date Issued: 1988
The biology and management considerations of abundant large cyprinids in Lake le Roux, Orange River, South Africa
- Authors: Tómasson, Tumi
- Date: 1983
- Subjects: Barbus Labeo Cyprinidae Freshwater fishes -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5206 , http://hdl.handle.net/10962/d1004518
- Description: The biology of three large cyprinid fishes, Barbus holubi, B. kimberleyensis and Labeo capensis, was studied in a large turbid man-made lake on the Orange River, South Africa. The influence of environmental fluctuations on population dynamics was examined in relation to biological adaptations. On this basis inferences were made about the effect exploitation would have on the populations, and management alternatives were considered. Lake Ie Roux is situated in a semi- arid area, downstream from another large reservoir, Lake Verwoerd. In the pristine river, flooding is seasonal, and floodwaters carry a heavy silt load. Lake Verwoerd acts as a silt-trap and changes in turbidity in Lake Ie Roux (Secchi disc readings range from 15 to 160 cm) are influenced by hydrological management and are not necessarily seasonal. Water temperatures in the regulated river connecting the two lakes depend on the pattern of water release, and fluctuations in Iake levels depend on management practices. Reproduction was studied by examination of gonads and from the distribution of newly hatched juveniles. Age and growth was interpreted from the reading of scales and otoliths. Relative year class strength, dispersal and mortality were monitored using catch data from a regular, standardized gillnetting survey. The Barbus species spawn in the regulated river in spring or summer. Spawning is coordinated for a large part of the population and B. holubi spawn four to six weeks earlier than B. kimberleyensis. The juveniles are 'initially found along the shoreline, but later move into the pelagic zone and disperse throughout the lake. Year class strength is dependent on time of spawning and a late spawning results in a poor year class. For this reason, year class strength of B. kimberleyensis is generally poor, but there is a greater variation in year class strength of B. holubi, which is the dominant large Barbus. The two Barbus species exploit the pelagic zone, visually predating on zooplankton. When turbidity increases large scale mortalities occur, especially in B. holubi. Mortalities more than compensate for the reduction in carrying capacity, and the size of the reduced population may be inversely related to initial abundance. Growth rate is similarly affected by turbidity and density, and size at sexual maturity in B. holubi is reduced when growing conditions deteriorate. Labeo capensis do not form a homogenous population in Lake le Roux. Spawning occurs throughout the lake, but is erratic, probably depending on local rainfall. At each locality, more than one spawning may occur during spring and summer because of temporal variation in gonadal development. Juvenile survival appears to be mainly dependent on water level fluctuations, and strong year classes were formed when the lake was filling during the first two years. Subsequent year classes were weak. Subadult and adult B. capensis are herbivorous and depend on autochthonous production for food. They are relatively sedentary, but when turbidity increases fish smaller than 200 mm disperse, probably in response to food shortages. Mortality rates may be accelerated but mortalities are not as high as in B. holubi. The growth rate of B. capensis is variable and depends on turbidity and population density. Size at sexual maturity remained relatively constant during the study period. B. holubi has a relatively fixed reproduction cycle in Lake le Roux and exploitation is likely to dampen fluctuations in population density. Population growth and stability could be further promoted through hydrological management. B. kimberleyensis does not represent an exploitable population in Lake le Roux, although the large size obtained by this species (>3 kg) may be an attraction to anglers. B. capensis does not appear to have the potential to withstand sustained exploitation because of its erratic and generally poor reproductive success. However, the species is long-lived and can sustain relatively high densities under harsh conditions because of its relatively low mortality rates. It was concluded that harvesting of B. holubi must be flexible to promote maximum benefits to commercial and recreational fisheries, but B. capensis which is not an angling species, should chiefly be exploited when catches of B. holubi are poor, but left to recover in between. An alternative management strategy would be to commercially exploit the fish populations of several reservoirs. A monitoring programme could be established to decide when each reservoir is to be exploited to see to the interests of commercial and recreational fishing alike.
- Full Text:
- Date Issued: 1983
- Authors: Tómasson, Tumi
- Date: 1983
- Subjects: Barbus Labeo Cyprinidae Freshwater fishes -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5206 , http://hdl.handle.net/10962/d1004518
- Description: The biology of three large cyprinid fishes, Barbus holubi, B. kimberleyensis and Labeo capensis, was studied in a large turbid man-made lake on the Orange River, South Africa. The influence of environmental fluctuations on population dynamics was examined in relation to biological adaptations. On this basis inferences were made about the effect exploitation would have on the populations, and management alternatives were considered. Lake Ie Roux is situated in a semi- arid area, downstream from another large reservoir, Lake Verwoerd. In the pristine river, flooding is seasonal, and floodwaters carry a heavy silt load. Lake Verwoerd acts as a silt-trap and changes in turbidity in Lake Ie Roux (Secchi disc readings range from 15 to 160 cm) are influenced by hydrological management and are not necessarily seasonal. Water temperatures in the regulated river connecting the two lakes depend on the pattern of water release, and fluctuations in Iake levels depend on management practices. Reproduction was studied by examination of gonads and from the distribution of newly hatched juveniles. Age and growth was interpreted from the reading of scales and otoliths. Relative year class strength, dispersal and mortality were monitored using catch data from a regular, standardized gillnetting survey. The Barbus species spawn in the regulated river in spring or summer. Spawning is coordinated for a large part of the population and B. holubi spawn four to six weeks earlier than B. kimberleyensis. The juveniles are 'initially found along the shoreline, but later move into the pelagic zone and disperse throughout the lake. Year class strength is dependent on time of spawning and a late spawning results in a poor year class. For this reason, year class strength of B. kimberleyensis is generally poor, but there is a greater variation in year class strength of B. holubi, which is the dominant large Barbus. The two Barbus species exploit the pelagic zone, visually predating on zooplankton. When turbidity increases large scale mortalities occur, especially in B. holubi. Mortalities more than compensate for the reduction in carrying capacity, and the size of the reduced population may be inversely related to initial abundance. Growth rate is similarly affected by turbidity and density, and size at sexual maturity in B. holubi is reduced when growing conditions deteriorate. Labeo capensis do not form a homogenous population in Lake le Roux. Spawning occurs throughout the lake, but is erratic, probably depending on local rainfall. At each locality, more than one spawning may occur during spring and summer because of temporal variation in gonadal development. Juvenile survival appears to be mainly dependent on water level fluctuations, and strong year classes were formed when the lake was filling during the first two years. Subsequent year classes were weak. Subadult and adult B. capensis are herbivorous and depend on autochthonous production for food. They are relatively sedentary, but when turbidity increases fish smaller than 200 mm disperse, probably in response to food shortages. Mortality rates may be accelerated but mortalities are not as high as in B. holubi. The growth rate of B. capensis is variable and depends on turbidity and population density. Size at sexual maturity remained relatively constant during the study period. B. holubi has a relatively fixed reproduction cycle in Lake le Roux and exploitation is likely to dampen fluctuations in population density. Population growth and stability could be further promoted through hydrological management. B. kimberleyensis does not represent an exploitable population in Lake le Roux, although the large size obtained by this species (>3 kg) may be an attraction to anglers. B. capensis does not appear to have the potential to withstand sustained exploitation because of its erratic and generally poor reproductive success. However, the species is long-lived and can sustain relatively high densities under harsh conditions because of its relatively low mortality rates. It was concluded that harvesting of B. holubi must be flexible to promote maximum benefits to commercial and recreational fisheries, but B. capensis which is not an angling species, should chiefly be exploited when catches of B. holubi are poor, but left to recover in between. An alternative management strategy would be to commercially exploit the fish populations of several reservoirs. A monitoring programme could be established to decide when each reservoir is to be exploited to see to the interests of commercial and recreational fishing alike.
- Full Text:
- Date Issued: 1983
A comparative study of the catechin components in the barks of wattle species related to Acacia Mernsii
- Authors: Maihs, Edwin Alfred
- Date: 1962
- Subjects: Wattles (Plants) Acacia mearnsii Acacia
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4482 , http://hdl.handle.net/10962/d1012793
- Description: The distribution of flavonoid constituents in the barks of Acacia mearnsii De Wild.(black wattle) , A· decurens Willd. (green wattle), A. dealbata Link.(silver wattle) and A. pycnantha Benth.(golden wattle) has been studied. Bark extracts of the four wattle species have been fractionated into low molecular weight fractions containing mainly catechins and other low molecular weight constituents, and high molecular weight fractions containing the bulk of the polymerized tannins. The low molecular weight fractions have been further fractionated by "preparative paper chromatography". (-)-Robinetinidol, (-)-7:3': 4': 5'-tetrahydroxy flavan- 3-ol, a new naturally occurring catechin, (+)-catechin and (+)-gallocatechin have been isolated from the barks of A. mearnsii, A. dealbata and A. pycnantha. (-)-Epicatechin and (-)-epigallocatechin have been identified in the bark extracts of A. dealbata and A. pycnantha, but appeared to be absent in the barks of A. mearnsii and A. decurrens. (-)-Epicatechin has been isolated fron A. dealbata, and both (-}-epicatechin and (-)-epigallocatechin were isolated from A. pycnantha. (-)-Epicatechin gallate, (-)-epigallocatechin gallate and gallic acid were isolated from A. pycnantha only. These three constituents appeared to be absent in the barks of the three other wattle species. (-)-Epigallocatechin, (-)-epicatechin gallate and (-)-epigallocatechin gallate which were not available for direct comparison, were subsequently isolated from green tea where they are present as major phenolic constituents. A method for the quantitative estimation of polyphenolic substances on two dimensional paper chromatograms has been developed, and a photoelectric densitometer constructed. Two spray reagents, ammoniacal silver nitrate and bisdiazotised benzidine, were found to give straight line relationships of instrument deflection against log concentration for flavonoid substances. This estimation method for the first time supplied means for a detailed study of the concentration of catechin constituents in the bark extracts of A. mearnsii, A. decurrens, A. dealbata, A. pycnantha and of A. mearnsii x A. decurrens hybrids. The concentration of catechin constituents has been shown to vary considerably between species whereas variation within species was small. In the latter respect silver wattle is an exception. Taxonomic significance may possibly be attached to the distribution of catechin constituents in the bark of the four Acacia species. The concentration of (-)-robinetinidol, which appears to be the characteristic compound of these Acacias, progressively decreases in the sequence black-, black x green hybrid, green-, silver- and golden wattle, while the number of catechin constituents of the "phloroglucinol series" increases in the same sequence. It thus appears, that by the examination of their bark components, a differentiation between species of a subgenera may be possible. Two tannins, constituents D and B, which are related to the leuco-anthocyanidins (flavan-3:4-diols) have been found in the barks of the four wattle species. One of the two, constituent D, was isolated in a pure form from the barks of A. mearnsii and A. pycnantha. Constituent D was found to generate robinetinidin and an orange pigment, the structure of which has not yet been fully identified. Compound D and its acetyl- and methoxyl derivatives did not crystallize. From the results of alkaline-, acidic- and enzymatic degradations, colour reactions and light-absorption studies, combustion analysis of the compound and its derivatives and molecular weight estimations, constituent D is surmised to be a dimer of 7:3': 4': 5'-tetrahydroxyflavan-3:4-diol (leuco-robinetinidin), The isolation of this complex leuco-anthocyanidin tannin represents the first isolation of a flavonoid tannin from commercial vegetable tannin sources. The second tannin obtained from the bark of A.mearnsii, "constituent B" appears to consist of two overlapping substances, which have not yet been separated. The tannin (B) was found to have an average molecular weight of 676 and it is considered likely that both substances may be dimolecular. On heating with mineral acid robinetinidin, fisetinidin and an orange pigment are generated, the pigment being identical with the pigment generated from constituent D. It may therefore be assumed that "Constituent B" consists of a mixture of complex leuco-robinetinidins and leucofisetinidins. The distribution of complex leuco-anthocyanidins in the bark extracts of Acacia mearnsii, A. decurrens, A. dealbata and A. pycnantha has been examined. A correlation between the distribution of leuco-anthocyanidins in the bark of the four wattle species, and accepted systematics, does not, apparently, exist.
- Full Text:
- Date Issued: 1962
- Authors: Maihs, Edwin Alfred
- Date: 1962
- Subjects: Wattles (Plants) Acacia mearnsii Acacia
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4482 , http://hdl.handle.net/10962/d1012793
- Description: The distribution of flavonoid constituents in the barks of Acacia mearnsii De Wild.(black wattle) , A· decurens Willd. (green wattle), A. dealbata Link.(silver wattle) and A. pycnantha Benth.(golden wattle) has been studied. Bark extracts of the four wattle species have been fractionated into low molecular weight fractions containing mainly catechins and other low molecular weight constituents, and high molecular weight fractions containing the bulk of the polymerized tannins. The low molecular weight fractions have been further fractionated by "preparative paper chromatography". (-)-Robinetinidol, (-)-7:3': 4': 5'-tetrahydroxy flavan- 3-ol, a new naturally occurring catechin, (+)-catechin and (+)-gallocatechin have been isolated from the barks of A. mearnsii, A. dealbata and A. pycnantha. (-)-Epicatechin and (-)-epigallocatechin have been identified in the bark extracts of A. dealbata and A. pycnantha, but appeared to be absent in the barks of A. mearnsii and A. decurrens. (-)-Epicatechin has been isolated fron A. dealbata, and both (-}-epicatechin and (-)-epigallocatechin were isolated from A. pycnantha. (-)-Epicatechin gallate, (-)-epigallocatechin gallate and gallic acid were isolated from A. pycnantha only. These three constituents appeared to be absent in the barks of the three other wattle species. (-)-Epigallocatechin, (-)-epicatechin gallate and (-)-epigallocatechin gallate which were not available for direct comparison, were subsequently isolated from green tea where they are present as major phenolic constituents. A method for the quantitative estimation of polyphenolic substances on two dimensional paper chromatograms has been developed, and a photoelectric densitometer constructed. Two spray reagents, ammoniacal silver nitrate and bisdiazotised benzidine, were found to give straight line relationships of instrument deflection against log concentration for flavonoid substances. This estimation method for the first time supplied means for a detailed study of the concentration of catechin constituents in the bark extracts of A. mearnsii, A. decurrens, A. dealbata, A. pycnantha and of A. mearnsii x A. decurrens hybrids. The concentration of catechin constituents has been shown to vary considerably between species whereas variation within species was small. In the latter respect silver wattle is an exception. Taxonomic significance may possibly be attached to the distribution of catechin constituents in the bark of the four Acacia species. The concentration of (-)-robinetinidol, which appears to be the characteristic compound of these Acacias, progressively decreases in the sequence black-, black x green hybrid, green-, silver- and golden wattle, while the number of catechin constituents of the "phloroglucinol series" increases in the same sequence. It thus appears, that by the examination of their bark components, a differentiation between species of a subgenera may be possible. Two tannins, constituents D and B, which are related to the leuco-anthocyanidins (flavan-3:4-diols) have been found in the barks of the four wattle species. One of the two, constituent D, was isolated in a pure form from the barks of A. mearnsii and A. pycnantha. Constituent D was found to generate robinetinidin and an orange pigment, the structure of which has not yet been fully identified. Compound D and its acetyl- and methoxyl derivatives did not crystallize. From the results of alkaline-, acidic- and enzymatic degradations, colour reactions and light-absorption studies, combustion analysis of the compound and its derivatives and molecular weight estimations, constituent D is surmised to be a dimer of 7:3': 4': 5'-tetrahydroxyflavan-3:4-diol (leuco-robinetinidin), The isolation of this complex leuco-anthocyanidin tannin represents the first isolation of a flavonoid tannin from commercial vegetable tannin sources. The second tannin obtained from the bark of A.mearnsii, "constituent B" appears to consist of two overlapping substances, which have not yet been separated. The tannin (B) was found to have an average molecular weight of 676 and it is considered likely that both substances may be dimolecular. On heating with mineral acid robinetinidin, fisetinidin and an orange pigment are generated, the pigment being identical with the pigment generated from constituent D. It may therefore be assumed that "Constituent B" consists of a mixture of complex leuco-robinetinidins and leucofisetinidins. The distribution of complex leuco-anthocyanidins in the bark extracts of Acacia mearnsii, A. decurrens, A. dealbata and A. pycnantha has been examined. A correlation between the distribution of leuco-anthocyanidins in the bark of the four wattle species, and accepted systematics, does not, apparently, exist.
- Full Text:
- Date Issued: 1962
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