The supervisor’s tale: postgraduate supervisors’ experiences in a changing Higher Education environment
- Authors: Searle, Ruth Lesley
- Date: 2015
- Subjects: Graduate students -- Supervision of -- South Africa , Education, Higher -- South Africa , Educational change -- South Africa , Archer, Margaret Scotford -- Political and social views , Critical realism , Knowledge, Sociology of , Dissertations, Academic , Faculty advisors -- South Africa , Education -- Study and teaching (Graduate) -- South Africa , Universities and colleges -- Graduate work
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1331 , http://hdl.handle.net/10962/d1019952
- Description: The environment in which higher education institutions operate is changing, and these changes are impacting on all aspects of higher education, including postgraduate levels. Changes wrought by globalisation, heralded by rapid advances in technology have inaugurated a new era in which there are long term consequences for higher education. The shift towards more quantitative and measurable "outputs" signifies a fundamental change in the educational ethos in institutions. Effectiveness is now judged primarily on numbers of graduates and publications rather than on other aspects. The drive is to produce a highly educated population, especially through increasing postgraduates who can drive national innovation and improve national economies. This affects academics in a range of ways, not least in the ways in which they engage in teaching, what they are willing to do and how they do it. Such changes influence the kinds of research done, the structures and funding which support research, and thus naturally shapes the kinds of postgraduate programmes and teaching that occurs. This study, situated in the field of Higher Education Studies, adopting a critical realist stance and drawing on the social theory of Margaret Archer and the concepts of expert and novice, explores the experiences of postgraduate supervisors from one South African institution across a range of disciplines. Individual experiences at the level of the Empirical and embodied in practice at the level of the Actual allow for the identification of possible mechanisms at the level of the Real which structure the sector. The research design then allows for an exploration across mezzo, macro and micro levels. Individuals outline their own particular situations, identifying a number of elements which enabled or constrained them and how, in exercising their agency, they develop their strategies for supervision drawing on a range of different resources that they identify and that may be available to them. Student characteristics, discipline status and placement, funding, and the emergent policy environment are all identified as influencing their practice. In some instances supervisors recognise the broader influences on the system that involve them in their undertaking, noting the international trends. Through their narratives and the discourses they engage a number of contradictions that have developed in the system with growing neo-liberal trends and vocationalism highlighting tensions between academic freedom and autonomy, and demands for productivity, efficiency and compliance, and between an educational focus and a training bias in particular along with others. Especially notable is how this contributes to the current ideologies surrounding knowledge and knowledge production. Their individual interests and concerns, and emergent academic identities as they take shape over time, also modifies the process and how individual supervisors influence their own environments in agentic moves becomes apparent. Whilst often individuals highlight the lack of support especially in the early phases of supervision, the emergent policy-constrained environment is also seen as curtailing possibilities and especially in limiting the possibilities for the exercise of agency. Whilst the study has some limitations in the range and number of respondents nevertheless the data provided rich evidence of how individual supervisors are affected, and how they respond in varied conditions. What is highlighted through these experiences are ways pressures are increasing for both supervisors and students and changing how they engage. Concerns in particular are raised about the growing functional and instrumental nature of the process with an emphasis on the effects on the kinds of researchers being developed and the knowledge that is therefore being produced. As costs increase for academics through the environments developed and with the varied roles they take on so they become more selective and reluctant to expand the role. This research has provided insights into ideas, beliefs and values relating to the postgraduate sector and to the process of postgraduate supervision and how it occurs. This includes the structures and cultural conditions that enable or constrain practitioners as they develop in the role in this particular institution. It has explored some of the ways that mechanisms at international, national and institutional levels shape the role and practices of supervisors. The effects of mechanisms are in no way a given or simply understood. In this way the research may contribute to more emancipatory knowledge which could be used in planning and deciding on emergent policies and practices which might create a more supportive and creative postgraduate environment.
- Full Text:
- Date Issued: 2015
- Authors: Searle, Ruth Lesley
- Date: 2015
- Subjects: Graduate students -- Supervision of -- South Africa , Education, Higher -- South Africa , Educational change -- South Africa , Archer, Margaret Scotford -- Political and social views , Critical realism , Knowledge, Sociology of , Dissertations, Academic , Faculty advisors -- South Africa , Education -- Study and teaching (Graduate) -- South Africa , Universities and colleges -- Graduate work
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1331 , http://hdl.handle.net/10962/d1019952
- Description: The environment in which higher education institutions operate is changing, and these changes are impacting on all aspects of higher education, including postgraduate levels. Changes wrought by globalisation, heralded by rapid advances in technology have inaugurated a new era in which there are long term consequences for higher education. The shift towards more quantitative and measurable "outputs" signifies a fundamental change in the educational ethos in institutions. Effectiveness is now judged primarily on numbers of graduates and publications rather than on other aspects. The drive is to produce a highly educated population, especially through increasing postgraduates who can drive national innovation and improve national economies. This affects academics in a range of ways, not least in the ways in which they engage in teaching, what they are willing to do and how they do it. Such changes influence the kinds of research done, the structures and funding which support research, and thus naturally shapes the kinds of postgraduate programmes and teaching that occurs. This study, situated in the field of Higher Education Studies, adopting a critical realist stance and drawing on the social theory of Margaret Archer and the concepts of expert and novice, explores the experiences of postgraduate supervisors from one South African institution across a range of disciplines. Individual experiences at the level of the Empirical and embodied in practice at the level of the Actual allow for the identification of possible mechanisms at the level of the Real which structure the sector. The research design then allows for an exploration across mezzo, macro and micro levels. Individuals outline their own particular situations, identifying a number of elements which enabled or constrained them and how, in exercising their agency, they develop their strategies for supervision drawing on a range of different resources that they identify and that may be available to them. Student characteristics, discipline status and placement, funding, and the emergent policy environment are all identified as influencing their practice. In some instances supervisors recognise the broader influences on the system that involve them in their undertaking, noting the international trends. Through their narratives and the discourses they engage a number of contradictions that have developed in the system with growing neo-liberal trends and vocationalism highlighting tensions between academic freedom and autonomy, and demands for productivity, efficiency and compliance, and between an educational focus and a training bias in particular along with others. Especially notable is how this contributes to the current ideologies surrounding knowledge and knowledge production. Their individual interests and concerns, and emergent academic identities as they take shape over time, also modifies the process and how individual supervisors influence their own environments in agentic moves becomes apparent. Whilst often individuals highlight the lack of support especially in the early phases of supervision, the emergent policy-constrained environment is also seen as curtailing possibilities and especially in limiting the possibilities for the exercise of agency. Whilst the study has some limitations in the range and number of respondents nevertheless the data provided rich evidence of how individual supervisors are affected, and how they respond in varied conditions. What is highlighted through these experiences are ways pressures are increasing for both supervisors and students and changing how they engage. Concerns in particular are raised about the growing functional and instrumental nature of the process with an emphasis on the effects on the kinds of researchers being developed and the knowledge that is therefore being produced. As costs increase for academics through the environments developed and with the varied roles they take on so they become more selective and reluctant to expand the role. This research has provided insights into ideas, beliefs and values relating to the postgraduate sector and to the process of postgraduate supervision and how it occurs. This includes the structures and cultural conditions that enable or constrain practitioners as they develop in the role in this particular institution. It has explored some of the ways that mechanisms at international, national and institutional levels shape the role and practices of supervisors. The effects of mechanisms are in no way a given or simply understood. In this way the research may contribute to more emancipatory knowledge which could be used in planning and deciding on emergent policies and practices which might create a more supportive and creative postgraduate environment.
- Full Text:
- Date Issued: 2015
The tax consequences of a contingent liability disposed of as part of the sale of a business as a going concern
- Authors: Staude, Daylan
- Date: 2015
- Subjects: Sale of business enterprises -- Taxation -- South Africa , Sale of business enterprises -- Law and legislation -- South Africa , Tax deductions -- South Africa , Contingent liabilities (Accounting) -- Taxation -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:918 , http://hdl.handle.net/10962/d1017544
- Description: The sale of an entity as a going concern has a number of tax consequences for both the purchaser and the seller. The tax deductibility of a contingent liability upon its transfer from the seller to the purchaser, where the selling price has been reduced by the value of the contingent liabilities transferred, remains uncertain following the decision in Ackermans Ltd v Commissioner for the South African Revenue Service. An expense is either deductible under a specific section of the Income Tax Act, 58 of 1962, or under the general expense provisions in terms of sections 11(a) and 23(g). The Act does not contain a specific section relating to contingent liabilities and therefore a contingent liability will need to be considered for deduction under these sections. The Act further disallows an expense as a deduction under section 23(e), where a reserve is created (for example a leave pay provision). This study analyses the tax deductibility of a contingent liability, where the contingent liability has been transferred from the seller to the purchaser in a sale of an entity as a going concern and the purchase price has been reduced to compensate for the transfer of the contingent liability. The deductibility of the contingent liability was first assessed in terms of the provisions of the Act (sections 11(a), 23(g) and 23(e)) and associated case law. The decision in the Ackermans case and its preceding Income Tax Case 1839 was then analysed in order to establish the principles arising from the decisions. Finally the proposals in the Draft Taxation Laws Amendment Bill, 2011, and the subsequent Discussion Document issued by the South African Revenue Service were discussed. The analysis revealed the continuing confusion surrounding the status quo, thus demonstrating the importance of legislative intervention to provide guidelines for taxpayers.
- Full Text:
- Date Issued: 2015
- Authors: Staude, Daylan
- Date: 2015
- Subjects: Sale of business enterprises -- Taxation -- South Africa , Sale of business enterprises -- Law and legislation -- South Africa , Tax deductions -- South Africa , Contingent liabilities (Accounting) -- Taxation -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:918 , http://hdl.handle.net/10962/d1017544
- Description: The sale of an entity as a going concern has a number of tax consequences for both the purchaser and the seller. The tax deductibility of a contingent liability upon its transfer from the seller to the purchaser, where the selling price has been reduced by the value of the contingent liabilities transferred, remains uncertain following the decision in Ackermans Ltd v Commissioner for the South African Revenue Service. An expense is either deductible under a specific section of the Income Tax Act, 58 of 1962, or under the general expense provisions in terms of sections 11(a) and 23(g). The Act does not contain a specific section relating to contingent liabilities and therefore a contingent liability will need to be considered for deduction under these sections. The Act further disallows an expense as a deduction under section 23(e), where a reserve is created (for example a leave pay provision). This study analyses the tax deductibility of a contingent liability, where the contingent liability has been transferred from the seller to the purchaser in a sale of an entity as a going concern and the purchase price has been reduced to compensate for the transfer of the contingent liability. The deductibility of the contingent liability was first assessed in terms of the provisions of the Act (sections 11(a), 23(g) and 23(e)) and associated case law. The decision in the Ackermans case and its preceding Income Tax Case 1839 was then analysed in order to establish the principles arising from the decisions. Finally the proposals in the Draft Taxation Laws Amendment Bill, 2011, and the subsequent Discussion Document issued by the South African Revenue Service were discussed. The analysis revealed the continuing confusion surrounding the status quo, thus demonstrating the importance of legislative intervention to provide guidelines for taxpayers.
- Full Text:
- Date Issued: 2015
The transition of Rhodes University graduates into the South African labour market : a case study of the 2010 cohort
- Authors: Ntikinca, Kanyiso Lungani
- Date: 2015
- Subjects: Rhodes University -- Graduate students , Labor market -- South Africa , College graduates -- Employment -- South Africa , Labor supply -- Research -- South Africa , Market segmentation -- South Africa , Employability -- South Africa , Race discrimination -- South Africa , Sex discrimination -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3395 , http://hdl.handle.net/10962/d1018198
- Description: Recent studies have shown that graduates from historically White universities (HWUs) experience better labour market outcomes than graduates from historically Black universities (HBUs). This is a result of the legacy of apartheid which promoted racial inequality in all spheres of South African society, more especially in higher education and the labour market. Post-1994, government dedicated large amounts for the restructuring of the higher education sector of South Africa in order to level out the playing field. However, graduates from HWUs still experience better labour market success than graduates from HBUs. That said, there is limited information about the labour market outcomes and experiences of graduates from a former White university (especially graduates from Rhodes University). Therefore, the central aim of this dissertation is to show that graduates from a historically White university (Rhodes University) experience varying and unequal outcomes in the South African labour market on account of (among other factors) their chosen fields of study, race and sex. This study is informed by the heterodox labour market approach, which is partly inspired by the critical realist account of the labour market. As a result, this theoretical framework allowed the researcher to use the Labour Market Segmentation (LMS) theory as a tool to inform this analysis. The study has adopted a quantitative survey design and has incorporated some of the key methodological lessons learned from the collection of international graduate tracer studies. The findings from this study indicated that ‘field of study’ is a strong determiner of the outcomes of Rhodes graduates in the labour market. This was visible in the persistence of a skills bias towards commerce and science graduates. Evidently, even when we controlled for race and sex, graduates from the commerce and science faculties experience better labour market outcomes than humanities graduates. This is a result of a skills biased South African economy, which has a higher demand for certain skills over others. However, the findings from this study also show evidence of pre-labour market discrimination and inequality (based on race and sex) in the supply-side institutions such as the family, schooling and university. The findings also show continuities and discontinuities of labour market discrimination (based on race and sex) in the outcomes of Rhodes graduates in the South African labour market. More importantly, this dissertation indicates that Rhodes graduates experience varying outcomes in the labour market as a result of (among other factors) their chosen fields of study, race and sex.
- Full Text:
- Date Issued: 2015
- Authors: Ntikinca, Kanyiso Lungani
- Date: 2015
- Subjects: Rhodes University -- Graduate students , Labor market -- South Africa , College graduates -- Employment -- South Africa , Labor supply -- Research -- South Africa , Market segmentation -- South Africa , Employability -- South Africa , Race discrimination -- South Africa , Sex discrimination -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3395 , http://hdl.handle.net/10962/d1018198
- Description: Recent studies have shown that graduates from historically White universities (HWUs) experience better labour market outcomes than graduates from historically Black universities (HBUs). This is a result of the legacy of apartheid which promoted racial inequality in all spheres of South African society, more especially in higher education and the labour market. Post-1994, government dedicated large amounts for the restructuring of the higher education sector of South Africa in order to level out the playing field. However, graduates from HWUs still experience better labour market success than graduates from HBUs. That said, there is limited information about the labour market outcomes and experiences of graduates from a former White university (especially graduates from Rhodes University). Therefore, the central aim of this dissertation is to show that graduates from a historically White university (Rhodes University) experience varying and unequal outcomes in the South African labour market on account of (among other factors) their chosen fields of study, race and sex. This study is informed by the heterodox labour market approach, which is partly inspired by the critical realist account of the labour market. As a result, this theoretical framework allowed the researcher to use the Labour Market Segmentation (LMS) theory as a tool to inform this analysis. The study has adopted a quantitative survey design and has incorporated some of the key methodological lessons learned from the collection of international graduate tracer studies. The findings from this study indicated that ‘field of study’ is a strong determiner of the outcomes of Rhodes graduates in the labour market. This was visible in the persistence of a skills bias towards commerce and science graduates. Evidently, even when we controlled for race and sex, graduates from the commerce and science faculties experience better labour market outcomes than humanities graduates. This is a result of a skills biased South African economy, which has a higher demand for certain skills over others. However, the findings from this study also show evidence of pre-labour market discrimination and inequality (based on race and sex) in the supply-side institutions such as the family, schooling and university. The findings also show continuities and discontinuities of labour market discrimination (based on race and sex) in the outcomes of Rhodes graduates in the South African labour market. More importantly, this dissertation indicates that Rhodes graduates experience varying outcomes in the labour market as a result of (among other factors) their chosen fields of study, race and sex.
- Full Text:
- Date Issued: 2015
The trophic ecology of the endangered endemic Barau's Petrel (Pterodroma baraui) from Reunion Island, south-western Indian Ocean
- Authors: Danckwerts, Daniel Keith
- Date: 2015
- Subjects: Petrels -- Réunion , Pterodroma baraui , Ecology -- Réunion
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5925 , http://hdl.handle.net/10962/d1017803
- Description: Réunion is the only tropical island that supports two endemic gadfly petrels. Population modelling has indicated that the current threats to the Barau’s Petrel (Pterodroma baraui) may drive it to extinction; this fate is almost definite for the Mascarene Petrel (Pseudobulweria aterrima). Management interventions have therefore been implemented, but conservation potential is handicapped since virtually nothing is known about the former species’ at-sea biology. Thus, following numerous recommendations, this study aimed to combine stomach content, stable isotope, and fatty acid analyses so to provide new information on the at-sea ecology of Barau’s Petrel. Breeding colonies were repeatedly visited over the same season and samples gathered from adults, fledglings, and downy chicks. Stomach contents consisted mostly of accumulated cephalopod beaks whereas structures from fishes, molluscs, arthropods, and crustaceans were less frequently encountered. Fatty acid profiles of blood varied greatly among individuals and the lowincidences of monounsaturated and n-3 fatty acids discounted fish as an important dietary component. δ¹⁵N of blood indicated a niche between the fourth and fifth trophic levels, which proposes that these birds scavenge to a greater degree than other sympatric seabirds and suggests that adults are also reliant on their endogenous reserves during breeding. δ¹³C values confirmed the migratory behaviour of adults since birds returning from the non-breeding grounds were enriched relative to individuals sampled through the breeding period. Significant intra-breeding season variations in δ13C were also observed, which matched this species’ patterns of habitat use as have recently described. These results collectively indicate an opportunistic behaviour, which implies some degree of resilience against shifts in prey availability/accessibility, and suggest that this species’ reproduction isdependent on distant foraging areas. This breeding strategy is synonymous with great vulnerability as over-investing into a single breeding episode may jeopardize future survival and fecundity. Thus, in light of environmental conditions that are becoming increasingly more susceptible to dramatic changes, the birds could rather be prioritising adult survival, over reproductive output. Further work is obviously necessary and should benefit from databases of fatty acid profiles and isotope signatures of potential prey species.
- Full Text:
- Date Issued: 2015
- Authors: Danckwerts, Daniel Keith
- Date: 2015
- Subjects: Petrels -- Réunion , Pterodroma baraui , Ecology -- Réunion
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5925 , http://hdl.handle.net/10962/d1017803
- Description: Réunion is the only tropical island that supports two endemic gadfly petrels. Population modelling has indicated that the current threats to the Barau’s Petrel (Pterodroma baraui) may drive it to extinction; this fate is almost definite for the Mascarene Petrel (Pseudobulweria aterrima). Management interventions have therefore been implemented, but conservation potential is handicapped since virtually nothing is known about the former species’ at-sea biology. Thus, following numerous recommendations, this study aimed to combine stomach content, stable isotope, and fatty acid analyses so to provide new information on the at-sea ecology of Barau’s Petrel. Breeding colonies were repeatedly visited over the same season and samples gathered from adults, fledglings, and downy chicks. Stomach contents consisted mostly of accumulated cephalopod beaks whereas structures from fishes, molluscs, arthropods, and crustaceans were less frequently encountered. Fatty acid profiles of blood varied greatly among individuals and the lowincidences of monounsaturated and n-3 fatty acids discounted fish as an important dietary component. δ¹⁵N of blood indicated a niche between the fourth and fifth trophic levels, which proposes that these birds scavenge to a greater degree than other sympatric seabirds and suggests that adults are also reliant on their endogenous reserves during breeding. δ¹³C values confirmed the migratory behaviour of adults since birds returning from the non-breeding grounds were enriched relative to individuals sampled through the breeding period. Significant intra-breeding season variations in δ13C were also observed, which matched this species’ patterns of habitat use as have recently described. These results collectively indicate an opportunistic behaviour, which implies some degree of resilience against shifts in prey availability/accessibility, and suggest that this species’ reproduction isdependent on distant foraging areas. This breeding strategy is synonymous with great vulnerability as over-investing into a single breeding episode may jeopardize future survival and fecundity. Thus, in light of environmental conditions that are becoming increasingly more susceptible to dramatic changes, the birds could rather be prioritising adult survival, over reproductive output. Further work is obviously necessary and should benefit from databases of fatty acid profiles and isotope signatures of potential prey species.
- Full Text:
- Date Issued: 2015
The use of hydrological information to improve flood management-integrated hydrological modelling of the Zambezi River basin
- Vilanculos, Agostinho Chuquelane Fadulo
- Authors: Vilanculos, Agostinho Chuquelane Fadulo
- Date: 2015
- Subjects: Hydrologic models -- Zambezi River Watershed , Watershed management -- Zambezi River Watershed , Water resources development -- Zambezi River Watershed , Flood control -- Zambezi River Watershed , Flood forecasting -- Zambezi River Watershed , Rain gauges -- Zambezi River Watershed
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6054 , http://hdl.handle.net/10962/d1018915
- Description: The recent high profile flooding events – that have occurred in many parts of the world – have drawn attention to the need for new and improved methods for water resources assessment, water management and the modelling of large-scale flooding events. In the case of the Zambezi Basin, a review of the 2000 and 2001 floods identified the need for tools to enable hydrologists to assess and predict daily stream flow and identify the areas that are likely to be affected by flooding. As a way to address the problem, a methodology was set up to derive catchment soil moisture statistics from Earth Observation (EO) data and to study the improvements brought about by an assimilation of this information into hydrological models for improving reservoir management in a data scarce environment. Rainfall data were obtained from the FEWSNet Web site and computed by the National Oceanic and Atmospheric Administration Climatic Prediction Center (NOAA/CPC). These datasets were processed and used to monitor rainfall variability and subsequently fed into a hydrological model to predict the daily flows for the Zambezi River Basin. The hydrological model used was the Geospatial Stream Flow Model (GeoSFM), developed by the United States Geological Survey (USGS). GeoSFM is a spatially semi-distributed physically-based hydrological model, parameterised using spatially distributed topographic data, soil characteristics and land cover data sets available globally from both Remote Sensing and in situ sources. The Satellite rainfall data were validated against data from twenty (20) rainfall gauges located on the Lower Zambezi. However, at several rain gauge stations (especially those with complex topography, which tended to experience high rainfall spatial variability), there was no direct correlation between the satellite estimates and the ground data as recorded in daily time steps. The model was calibrated for seven gauging stations. The calibrated model performed quite well at seven selected locations (R2=0.66 to 0.90, CE=0.51 to 0.88, RSR=0.35 to 0.69, PBIAS=−4.5 to 7.5). The observed data were obtained from the National Water Agencies of the riparian countries. After GeoSFM calibration, the model generated an integration of the flows into a reservoir and hydropower model to optimise the operation of Kariba and Cahora Bassa dams. The Kariba and Cahora Bassa dams were selected because this study considers these two dams as the major infrastructures for controlling and alleviating floods in the Zambezi River Basin. Other dams (such as the Kafue and Itezhi-Thezi) were recognised in terms of their importance but including them was beyond the scope of this study because of financial and time constraints. The licence of the reservoir model was limited to one year for the same reason. The reservoir model used was the MIKE BASIN, a professional engineering software package and quasi-steady-state mass balance modelling tool for integrated river basin and management, developed by the Denmark Hydraulic Institute (DHI) in 2003. The model was parameterised by the geometry of the reservoir basin (level, area, volume relationships) and by the discharge-level (Q-h) relationship of the dam spillways. The integrated modelling system simulated the daily flow variation for all Zambezi River sub-basins between 1998 and 2008 and validated between 2009 and 2011. The resulting streamflows have been expressed in terms of hydrograph comparisons between simulated and observed flow values at the four gauging stations located downstream of Cahora Bassa dam. The integrated model performed well, between observed and forecast streamflows, at four selected gauging stations (R2=0.53 to 0.90, CE=0.50 to 0.80, RSR=0.49 to 0.69, PBIAS=−2.10 to 4.8). From the results of integrated modelling, it was observed that both Kariba and Cahora Bassa are currently being operated based on the maximum rule curve and both remain focused on maximising hydropower production and ensuring dam safety rather than other potential influences by the Zambezi River (such as flood control downstream – where the communities are located – and environmental issues). In addition, the flood mapping analysis demonstrated that the Cahora Bassa dam plays an important part in flood mitigation downstream of the dams. In the absence of optimisation of flow releases from both the Kariba and Cahora Bassa dams, in additional to the contribution of any other tributaries located downstream of the dams, the impact of flooding can be severe. As such, this study has developed new approaches for flood monitoring downstream of the Zambezi Basin, through the application of an integrated modelling system. The modelling system consists of: predicting daily streamflow (using the calibrated GeoSFM), then feeding the predicted streamflow into MIKE BASIN (for checking the operating rules) and to optimise the releases. Therefore, before releases are made, the flood maps can be used as a decision-making tool to both assess the impact of each level of release downstream and to identify the communities likely to be affected by the flood – this ensures that the necessary warnings can be issued before flooding occurs. Finally an integrated flood management tool was proposed – to host the results produced by the integrated system – which would then be accessible for assessment by the different users. These results were expressed in terms of water level (m). Four discharge-level (Q-h) relationships were developed for converting the simulated flow into water level at four selected sites downstream of Cahora Bassa dam – namely: Cahora Bassa dam site, Tete (E-320), Caia (E-291) and Marromeu (E-285). However, the uncertainties in these predictions suggested that improved monitoring systems may be achieved if data access at appropriate scale and quality was improved.
- Full Text:
- Date Issued: 2015
- Authors: Vilanculos, Agostinho Chuquelane Fadulo
- Date: 2015
- Subjects: Hydrologic models -- Zambezi River Watershed , Watershed management -- Zambezi River Watershed , Water resources development -- Zambezi River Watershed , Flood control -- Zambezi River Watershed , Flood forecasting -- Zambezi River Watershed , Rain gauges -- Zambezi River Watershed
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6054 , http://hdl.handle.net/10962/d1018915
- Description: The recent high profile flooding events – that have occurred in many parts of the world – have drawn attention to the need for new and improved methods for water resources assessment, water management and the modelling of large-scale flooding events. In the case of the Zambezi Basin, a review of the 2000 and 2001 floods identified the need for tools to enable hydrologists to assess and predict daily stream flow and identify the areas that are likely to be affected by flooding. As a way to address the problem, a methodology was set up to derive catchment soil moisture statistics from Earth Observation (EO) data and to study the improvements brought about by an assimilation of this information into hydrological models for improving reservoir management in a data scarce environment. Rainfall data were obtained from the FEWSNet Web site and computed by the National Oceanic and Atmospheric Administration Climatic Prediction Center (NOAA/CPC). These datasets were processed and used to monitor rainfall variability and subsequently fed into a hydrological model to predict the daily flows for the Zambezi River Basin. The hydrological model used was the Geospatial Stream Flow Model (GeoSFM), developed by the United States Geological Survey (USGS). GeoSFM is a spatially semi-distributed physically-based hydrological model, parameterised using spatially distributed topographic data, soil characteristics and land cover data sets available globally from both Remote Sensing and in situ sources. The Satellite rainfall data were validated against data from twenty (20) rainfall gauges located on the Lower Zambezi. However, at several rain gauge stations (especially those with complex topography, which tended to experience high rainfall spatial variability), there was no direct correlation between the satellite estimates and the ground data as recorded in daily time steps. The model was calibrated for seven gauging stations. The calibrated model performed quite well at seven selected locations (R2=0.66 to 0.90, CE=0.51 to 0.88, RSR=0.35 to 0.69, PBIAS=−4.5 to 7.5). The observed data were obtained from the National Water Agencies of the riparian countries. After GeoSFM calibration, the model generated an integration of the flows into a reservoir and hydropower model to optimise the operation of Kariba and Cahora Bassa dams. The Kariba and Cahora Bassa dams were selected because this study considers these two dams as the major infrastructures for controlling and alleviating floods in the Zambezi River Basin. Other dams (such as the Kafue and Itezhi-Thezi) were recognised in terms of their importance but including them was beyond the scope of this study because of financial and time constraints. The licence of the reservoir model was limited to one year for the same reason. The reservoir model used was the MIKE BASIN, a professional engineering software package and quasi-steady-state mass balance modelling tool for integrated river basin and management, developed by the Denmark Hydraulic Institute (DHI) in 2003. The model was parameterised by the geometry of the reservoir basin (level, area, volume relationships) and by the discharge-level (Q-h) relationship of the dam spillways. The integrated modelling system simulated the daily flow variation for all Zambezi River sub-basins between 1998 and 2008 and validated between 2009 and 2011. The resulting streamflows have been expressed in terms of hydrograph comparisons between simulated and observed flow values at the four gauging stations located downstream of Cahora Bassa dam. The integrated model performed well, between observed and forecast streamflows, at four selected gauging stations (R2=0.53 to 0.90, CE=0.50 to 0.80, RSR=0.49 to 0.69, PBIAS=−2.10 to 4.8). From the results of integrated modelling, it was observed that both Kariba and Cahora Bassa are currently being operated based on the maximum rule curve and both remain focused on maximising hydropower production and ensuring dam safety rather than other potential influences by the Zambezi River (such as flood control downstream – where the communities are located – and environmental issues). In addition, the flood mapping analysis demonstrated that the Cahora Bassa dam plays an important part in flood mitigation downstream of the dams. In the absence of optimisation of flow releases from both the Kariba and Cahora Bassa dams, in additional to the contribution of any other tributaries located downstream of the dams, the impact of flooding can be severe. As such, this study has developed new approaches for flood monitoring downstream of the Zambezi Basin, through the application of an integrated modelling system. The modelling system consists of: predicting daily streamflow (using the calibrated GeoSFM), then feeding the predicted streamflow into MIKE BASIN (for checking the operating rules) and to optimise the releases. Therefore, before releases are made, the flood maps can be used as a decision-making tool to both assess the impact of each level of release downstream and to identify the communities likely to be affected by the flood – this ensures that the necessary warnings can be issued before flooding occurs. Finally an integrated flood management tool was proposed – to host the results produced by the integrated system – which would then be accessible for assessment by the different users. These results were expressed in terms of water level (m). Four discharge-level (Q-h) relationships were developed for converting the simulated flow into water level at four selected sites downstream of Cahora Bassa dam – namely: Cahora Bassa dam site, Tete (E-320), Caia (E-291) and Marromeu (E-285). However, the uncertainties in these predictions suggested that improved monitoring systems may be achieved if data access at appropriate scale and quality was improved.
- Full Text:
- Date Issued: 2015
The use of probiotics in the diet of farmed South African abalone Haliotis midae L
- Authors: Maliza, Siyabonga
- Date: 2015
- Subjects: Haliotis midae -- South Africa , Abalones -- South Africa , Haliotis midae -- Feeding and feeds , Haliotis midae -- Effect of chemicals on , Haliotis midae -- Growth , Haliotis midae -- Immunology , Probiotics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5382 , http://hdl.handle.net/10962/d1018178
- Description: Physiological stress in farmed abalone can lead to immunosuppression and increase the susceptibility to bacterial, viral and parasitic disease, often followed by mortality. Thus, handling and poor water quality can reduce farm production efficiency. Probiotics in aquaculture have been effective in a wide range of species in enhancing immunity, survival, improving feed utilisation and growth. Three putative probionts identified as a result of in vitro screening had been beneficial to laboratory-reared abalone in a previous study. The aim of this study was to produce an abalone feed that contains a suite of probionts that may promote abalone growth and health under farming conditions. The objectives were to compare growth and physiological responses (i.e., haemocyte and phagocytosis counts) of abalone fed a commercial feed (Abfeed®S 34, Marifeed, Hermanus) supplemented with probiotics (i.e., the probiotic diet) to abalone fed the commercial feed without probiotic supplementation as a control treatment in a factorial design with handling method as an independent variable. This experiment was conducted at HIK Abalone Farm (Pty Ltd) for a period of eight months with initial weight and length 36.1 ± 0.05 g and 58.6 ± 0.06 mm abalone-1. Another experiment was carried out at Roman Bay Sea Farm (Pty) Ltd with initial weight and length 34.7 ± 0.17 g and 62.3 ± 0.18 mm abalone-1, but this experiment included one factor only, i.e. the presence and absence of the probionts in the feed. At HIK there was no significant interaction between diet and handling on average length and weight gain month-1 after four (p=0.81 and p=0.32) and eight (p=0.51 and p=0.53) months, respectively. Average length (additional handling = 73.9 ± 0.52 mm, normal farm handling = 75.8 ± 0.57 mm) and weight gain (mean: additional handling = 68.5 ± 1.20 g, normal farm handling = 74.3 ± 1.86 g) increased significantly in animals that were handled under normal farm procedure and were either fed probiotic or control diet after eight months (p=0.03 and p=0.02, respectively). There was no iii difference in length gain or weight gain of abalone fed the probiotic diet and those fed the control diet (ANOVA: F(1,16)=0.04, p=0.84; F(1,16)=0.14, p=0.71, respectively). After four months phagocytotic count was significantly different between dietary treatments with mean values of 74.50 ± 10.52 and 63.52 ± 14.52 % phagocytosis count per sample for the probionts and control treatment, respectively (p=0.04), there was no difference after eight months at HIK Abalone Farm. There was no effect of stressor application (p=0.14) and no interaction between dietary treatment and stressor application for this variable i.e., phagocytosis count (p=0.61). There was no difference in feed conversion ratio between treatments with values ranging from 2.9 to 3.8. At Roman Bay Sea farm, there was no significant difference in mean length gain between abalone fed the probiotic and control diet after eight months (repeated measures ANOVA: F(4,28)=16.54. Mean weight gain of abalone fed the probiotic diet was significantly greater than those fed the control diet after eight months (repeated measures ANOVA: F(4,28)=39.82, p(0.00001). There was no significant difference in haemocyte counts between animals fed either probiotic or control diet after four and eight months at Roman Bay Sea farm (p>0.05).
- Full Text:
- Date Issued: 2015
- Authors: Maliza, Siyabonga
- Date: 2015
- Subjects: Haliotis midae -- South Africa , Abalones -- South Africa , Haliotis midae -- Feeding and feeds , Haliotis midae -- Effect of chemicals on , Haliotis midae -- Growth , Haliotis midae -- Immunology , Probiotics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5382 , http://hdl.handle.net/10962/d1018178
- Description: Physiological stress in farmed abalone can lead to immunosuppression and increase the susceptibility to bacterial, viral and parasitic disease, often followed by mortality. Thus, handling and poor water quality can reduce farm production efficiency. Probiotics in aquaculture have been effective in a wide range of species in enhancing immunity, survival, improving feed utilisation and growth. Three putative probionts identified as a result of in vitro screening had been beneficial to laboratory-reared abalone in a previous study. The aim of this study was to produce an abalone feed that contains a suite of probionts that may promote abalone growth and health under farming conditions. The objectives were to compare growth and physiological responses (i.e., haemocyte and phagocytosis counts) of abalone fed a commercial feed (Abfeed®S 34, Marifeed, Hermanus) supplemented with probiotics (i.e., the probiotic diet) to abalone fed the commercial feed without probiotic supplementation as a control treatment in a factorial design with handling method as an independent variable. This experiment was conducted at HIK Abalone Farm (Pty Ltd) for a period of eight months with initial weight and length 36.1 ± 0.05 g and 58.6 ± 0.06 mm abalone-1. Another experiment was carried out at Roman Bay Sea Farm (Pty) Ltd with initial weight and length 34.7 ± 0.17 g and 62.3 ± 0.18 mm abalone-1, but this experiment included one factor only, i.e. the presence and absence of the probionts in the feed. At HIK there was no significant interaction between diet and handling on average length and weight gain month-1 after four (p=0.81 and p=0.32) and eight (p=0.51 and p=0.53) months, respectively. Average length (additional handling = 73.9 ± 0.52 mm, normal farm handling = 75.8 ± 0.57 mm) and weight gain (mean: additional handling = 68.5 ± 1.20 g, normal farm handling = 74.3 ± 1.86 g) increased significantly in animals that were handled under normal farm procedure and were either fed probiotic or control diet after eight months (p=0.03 and p=0.02, respectively). There was no iii difference in length gain or weight gain of abalone fed the probiotic diet and those fed the control diet (ANOVA: F(1,16)=0.04, p=0.84; F(1,16)=0.14, p=0.71, respectively). After four months phagocytotic count was significantly different between dietary treatments with mean values of 74.50 ± 10.52 and 63.52 ± 14.52 % phagocytosis count per sample for the probionts and control treatment, respectively (p=0.04), there was no difference after eight months at HIK Abalone Farm. There was no effect of stressor application (p=0.14) and no interaction between dietary treatment and stressor application for this variable i.e., phagocytosis count (p=0.61). There was no difference in feed conversion ratio between treatments with values ranging from 2.9 to 3.8. At Roman Bay Sea farm, there was no significant difference in mean length gain between abalone fed the probiotic and control diet after eight months (repeated measures ANOVA: F(4,28)=16.54. Mean weight gain of abalone fed the probiotic diet was significantly greater than those fed the control diet after eight months (repeated measures ANOVA: F(4,28)=39.82, p(0.00001). There was no significant difference in haemocyte counts between animals fed either probiotic or control diet after four and eight months at Roman Bay Sea farm (p>0.05).
- Full Text:
- Date Issued: 2015
The value of locally isolated freshwater micro-algae in toxicity testing for water resource management in South Africa
- Authors: Gola, Nontutuzelo Pearl
- Date: 2015
- Subjects: Microalgae -- South Africa , Toxicity testing , Water resources development -- South Africa , Aquatic habitats -- South Africa , Water -- Pollution -- Toxicology , Water quality management -- South Africa , Sewage disposal in rivers, lakes, etc. -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6049 , http://hdl.handle.net/10962/d1017873
- Description: The ecological position of micro-algae at the base of the aquatic food web makes them critical components of aquatic ecosystems. Their short generation time also makes them useful biological indicators because they respond quickly to changes in environmental condition, enabling timely identification and assessment of water quality changes. The inclusion of micro-algae as indicators in water resource regulation and management in South Africa has started recently, their more extensive use in biomonitoring and ecotoxicology programmes for water resource management would contribute to the South African policy if water resource protection. The standard algal growth inhibition assay with the species Pseudokirchneriella subcapitata is currently used for monitoring toxicity of in-stream and industrial wastewater discharges to freshwater micro-algae. The relevance of the data generated by standard toxicity bioassays has been questioned, since micro-algae in particular are extremely variable in their sensitivity to a range of contaminants and these standard species used may not occur in the local aquatic environment. As a result, international regulatory agencies, have recommended algal growth inhibition tests be changed from a single standard species to tests with a number of species. One recommendation, in addition to the use of standard toxicity tests, is the use of species isolated from the local environment which may be more relevant for assessing site specific impacts. This study investigated the value and application of locally isolated South African freshwater micro-algae in toxicity tests for water resource management and was carried out in three phases. The first phase involved isolating micro-algae from South African aquatic resources. Micro-algae suitable for toxicity testing were identified and selected using as set of criteria. Three (Scenedesmus bicaudatus, Chlorella sorokiniana and Chlorella vulgaris) out of eight successfully isolated species satisfied the prescribed selection criteria and these were selected as potential toxicity test species. The second phase focused on refining and adapting the existing algal toxicity test protocol (the algal growth inhibition assay) for use on the locally isolated algal species. The refinement of the test protocol was achieved by exposing the locally isolated species to reference toxicants in order to assess and compare their growth and sensitivity to the toxicants under the prescribed toxicity test conditions with that of the standard toxicity test species (Pseudokirchneriella subcapitata) and a commercial laboratory species (Chlorella protothecoides). During this phase, one of the three local species (Scenedesmus bicaudatus) was eliminated as a potential toxicity test species due to inconsistent growth. The third phase of the study involved assessing the sensitivity of the two remaining species (C. vulgaris and C. sorokiniana) to a range of toxicants (reference toxicants, salts, effluents and a herbicide) and comparing it to that of the standard toxicity test species P. subcapitata and C. protothecoides. The toxicants were selected based on their relative importance in the South African context, as well as the practicality of using these local micro-algae to routinely determine the impact of these toxicants on local aquatic resources. The growth of the four micro-algae was stimulated by the selected effluents. The standard toxicity test species P. subcapitata was ranked the most sensitive and of the four species to two reference toxicants and two inorganic salts. Chlorella sorokiniana was ranked the most sensitive of the three Chlorella species to two reference toxicants and two inorganic salts. The herbicide stimulated the growth of C. vulgaris while inhibiting the growth of the other species. Pseudokirchneriela subcapitata and C. sorokiniana showed high intra-specific variability in growth, which made it difficult to determine the effective concentrations of the herbicide and therefore compare the sensitivity of the species. This varied response of micro-algal species to toxicants may result in the biodiversity shifts in aquatic ecosystems, and also supports the recommendation of using a battery of different species to support more informed decisions in water resource management.
- Full Text:
- Date Issued: 2015
- Authors: Gola, Nontutuzelo Pearl
- Date: 2015
- Subjects: Microalgae -- South Africa , Toxicity testing , Water resources development -- South Africa , Aquatic habitats -- South Africa , Water -- Pollution -- Toxicology , Water quality management -- South Africa , Sewage disposal in rivers, lakes, etc. -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6049 , http://hdl.handle.net/10962/d1017873
- Description: The ecological position of micro-algae at the base of the aquatic food web makes them critical components of aquatic ecosystems. Their short generation time also makes them useful biological indicators because they respond quickly to changes in environmental condition, enabling timely identification and assessment of water quality changes. The inclusion of micro-algae as indicators in water resource regulation and management in South Africa has started recently, their more extensive use in biomonitoring and ecotoxicology programmes for water resource management would contribute to the South African policy if water resource protection. The standard algal growth inhibition assay with the species Pseudokirchneriella subcapitata is currently used for monitoring toxicity of in-stream and industrial wastewater discharges to freshwater micro-algae. The relevance of the data generated by standard toxicity bioassays has been questioned, since micro-algae in particular are extremely variable in their sensitivity to a range of contaminants and these standard species used may not occur in the local aquatic environment. As a result, international regulatory agencies, have recommended algal growth inhibition tests be changed from a single standard species to tests with a number of species. One recommendation, in addition to the use of standard toxicity tests, is the use of species isolated from the local environment which may be more relevant for assessing site specific impacts. This study investigated the value and application of locally isolated South African freshwater micro-algae in toxicity tests for water resource management and was carried out in three phases. The first phase involved isolating micro-algae from South African aquatic resources. Micro-algae suitable for toxicity testing were identified and selected using as set of criteria. Three (Scenedesmus bicaudatus, Chlorella sorokiniana and Chlorella vulgaris) out of eight successfully isolated species satisfied the prescribed selection criteria and these were selected as potential toxicity test species. The second phase focused on refining and adapting the existing algal toxicity test protocol (the algal growth inhibition assay) for use on the locally isolated algal species. The refinement of the test protocol was achieved by exposing the locally isolated species to reference toxicants in order to assess and compare their growth and sensitivity to the toxicants under the prescribed toxicity test conditions with that of the standard toxicity test species (Pseudokirchneriella subcapitata) and a commercial laboratory species (Chlorella protothecoides). During this phase, one of the three local species (Scenedesmus bicaudatus) was eliminated as a potential toxicity test species due to inconsistent growth. The third phase of the study involved assessing the sensitivity of the two remaining species (C. vulgaris and C. sorokiniana) to a range of toxicants (reference toxicants, salts, effluents and a herbicide) and comparing it to that of the standard toxicity test species P. subcapitata and C. protothecoides. The toxicants were selected based on their relative importance in the South African context, as well as the practicality of using these local micro-algae to routinely determine the impact of these toxicants on local aquatic resources. The growth of the four micro-algae was stimulated by the selected effluents. The standard toxicity test species P. subcapitata was ranked the most sensitive and of the four species to two reference toxicants and two inorganic salts. Chlorella sorokiniana was ranked the most sensitive of the three Chlorella species to two reference toxicants and two inorganic salts. The herbicide stimulated the growth of C. vulgaris while inhibiting the growth of the other species. Pseudokirchneriela subcapitata and C. sorokiniana showed high intra-specific variability in growth, which made it difficult to determine the effective concentrations of the herbicide and therefore compare the sensitivity of the species. This varied response of micro-algal species to toxicants may result in the biodiversity shifts in aquatic ecosystems, and also supports the recommendation of using a battery of different species to support more informed decisions in water resource management.
- Full Text:
- Date Issued: 2015
The ‘obesity epidemic’ : an analysis of representations of obesity in mainstream South African newspapers post-1997
- Authors: Malan, Chantelle Therese
- Date: 2015
- Subjects: Obesity -- South Africa , Obesity -- Press coverage -- South Africa , Obesity -- Social aspects -- South Africa , Discrimination against overweight persons -- South Africa , Social medicine -- South Africa , Agent (Philosophy) , Social control -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2892 , http://hdl.handle.net/10962/d1019751
- Description: This study of 449 newspaper articles from South Africa from 1997 provides an analysis of the representations of obesity evinced in the corpus. The research argues that obesity is overwhelmingly framed as being diseased and that there are four main refrains within this frame, namely, statistics on obesity, the naturalisation of negative assumptions about fat, the social dysfunction of fat and the use of crisis metaphors to describe fatness. This framing lends itself to representations of obesity which are raced, gendered and classed. Fat bodies are portrayed as being in deficit and fat people as lacking agency. The disproportional focus on black bodies in the corpus can be attributed to assumptions of ‘incivility’ which are premised on racial stereotypes which construct black people as being unintelligent, irrational, lacking agency and being largely dependent on others to survive. This disproportional focus on black bodies can also be understood in the context of emerging markets. This study argues that the medicalisation of obesity has contributed to many oversimplifications and contradictions in the representation of obesity in the corpus, which seem to go unquestioned, such as the conflation of weight and health, something I argue is one of the main contributors to the negative consequences of the dominant framing of obesity. Framing obesity as medicalised also promotes fat shaming and acts as a form of social control which maintains existing power relations through the use of discursive practices for the identification and control of deviants. These representations are problematic chiefly because they promote the dehumanisation of fat people, but also because that they do not promote good health as they claim to do.
- Full Text:
- Date Issued: 2015
- Authors: Malan, Chantelle Therese
- Date: 2015
- Subjects: Obesity -- South Africa , Obesity -- Press coverage -- South Africa , Obesity -- Social aspects -- South Africa , Discrimination against overweight persons -- South Africa , Social medicine -- South Africa , Agent (Philosophy) , Social control -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2892 , http://hdl.handle.net/10962/d1019751
- Description: This study of 449 newspaper articles from South Africa from 1997 provides an analysis of the representations of obesity evinced in the corpus. The research argues that obesity is overwhelmingly framed as being diseased and that there are four main refrains within this frame, namely, statistics on obesity, the naturalisation of negative assumptions about fat, the social dysfunction of fat and the use of crisis metaphors to describe fatness. This framing lends itself to representations of obesity which are raced, gendered and classed. Fat bodies are portrayed as being in deficit and fat people as lacking agency. The disproportional focus on black bodies in the corpus can be attributed to assumptions of ‘incivility’ which are premised on racial stereotypes which construct black people as being unintelligent, irrational, lacking agency and being largely dependent on others to survive. This disproportional focus on black bodies can also be understood in the context of emerging markets. This study argues that the medicalisation of obesity has contributed to many oversimplifications and contradictions in the representation of obesity in the corpus, which seem to go unquestioned, such as the conflation of weight and health, something I argue is one of the main contributors to the negative consequences of the dominant framing of obesity. Framing obesity as medicalised also promotes fat shaming and acts as a form of social control which maintains existing power relations through the use of discursive practices for the identification and control of deviants. These representations are problematic chiefly because they promote the dehumanisation of fat people, but also because that they do not promote good health as they claim to do.
- Full Text:
- Date Issued: 2015
Thermal physiology and behavioural ecology of the white shark, carcharodon carcharias
- Authors: Gennari, Enrico
- Date: 2015
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/64002 , vital:28522
- Description: Expected release date-May 2019
- Full Text:
- Date Issued: 2015
- Authors: Gennari, Enrico
- Date: 2015
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/64002 , vital:28522
- Description: Expected release date-May 2019
- Full Text:
- Date Issued: 2015
Through the Camera Obscura : exploring the voyeuristic gaze through Grahamstown's architecture
- Authors: King, Taryn
- Date: 2015
- Subjects: Architecture -- South Africa -- Grahamstown , Camera obscuras -- South Africa -- Grahamstown , Voyeurism in art , Gaze in art , Architecture and society -- South Africa -- Grahamstown , Human figure in art , Women in art
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2511 , http://hdl.handle.net/10962/d1018937
- Description: My study explores the politics of viewing and the gaze. I argue that the gaze both arrests and objectifies the body, which in turn transforms subjects into objects therefore regulating social behaviour. The basic notion of the gaze will be explored throughout this thesis and thereby contextualizes my sculptures, which are casts of my naked body. My particular concern lies in how the ideas of surveillance have had an influence on architecture and buildings in Grahamstown. Throughout this mini thesis, I will explore a number of architectural spaces of Grahamstown such as the Provost prison, Fort Selwyn and the Camera Obscura which I argue were all designed based on the ideas of surveillance. The entanglement of Grahamstown architecture and the female form as a subject of voyeurism forms an important part of this thesis, as the context of Grahamstown architecture is centered on visibility, which in turn subjects people to a form of discipline. The Provost Prison, the Camera Obscura and the forts of Grahamstown are all good examples of this. Outside of this, the female body is also subjected to the gaze, which in turn suggests that the female body is also under surveillance and as a result also becomes disciplined. My installation is a response to Antony Gormley’s Event Horizon, in which he placed 33 steel and fibreglass casts of his own naked body at an elevated level on buildings around Manhattan and Brazil. In this discussion I have contextualized my work with reference to the ideas of different theorists. The three main theorists I have cited are Michel Foucault, Jonathan Crary and Laura Mulvey. Foucault is specifically cited due to his discussion on Panoptic power, surveillance and docile bodies. Crary makes a number of important points with regards to the ideological operations of the Camera Obscura as well as its history while Laura Mulvey’s writings form the basis of the voyeuristic gaze from the perspective of a feminist.
- Full Text:
- Date Issued: 2015
- Authors: King, Taryn
- Date: 2015
- Subjects: Architecture -- South Africa -- Grahamstown , Camera obscuras -- South Africa -- Grahamstown , Voyeurism in art , Gaze in art , Architecture and society -- South Africa -- Grahamstown , Human figure in art , Women in art
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2511 , http://hdl.handle.net/10962/d1018937
- Description: My study explores the politics of viewing and the gaze. I argue that the gaze both arrests and objectifies the body, which in turn transforms subjects into objects therefore regulating social behaviour. The basic notion of the gaze will be explored throughout this thesis and thereby contextualizes my sculptures, which are casts of my naked body. My particular concern lies in how the ideas of surveillance have had an influence on architecture and buildings in Grahamstown. Throughout this mini thesis, I will explore a number of architectural spaces of Grahamstown such as the Provost prison, Fort Selwyn and the Camera Obscura which I argue were all designed based on the ideas of surveillance. The entanglement of Grahamstown architecture and the female form as a subject of voyeurism forms an important part of this thesis, as the context of Grahamstown architecture is centered on visibility, which in turn subjects people to a form of discipline. The Provost Prison, the Camera Obscura and the forts of Grahamstown are all good examples of this. Outside of this, the female body is also subjected to the gaze, which in turn suggests that the female body is also under surveillance and as a result also becomes disciplined. My installation is a response to Antony Gormley’s Event Horizon, in which he placed 33 steel and fibreglass casts of his own naked body at an elevated level on buildings around Manhattan and Brazil. In this discussion I have contextualized my work with reference to the ideas of different theorists. The three main theorists I have cited are Michel Foucault, Jonathan Crary and Laura Mulvey. Foucault is specifically cited due to his discussion on Panoptic power, surveillance and docile bodies. Crary makes a number of important points with regards to the ideological operations of the Camera Obscura as well as its history while Laura Mulvey’s writings form the basis of the voyeuristic gaze from the perspective of a feminist.
- Full Text:
- Date Issued: 2015
Towards a framework for building security operation centers
- Authors: Jacobs, Pierre Conrad
- Date: 2015
- Subjects: Security systems industry , Systems engineering , Expert systems (Computer science) , COBIT (Information technology management standard) , Computer security
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4710 , http://hdl.handle.net/10962/d1017932
- Description: In this thesis a framework for Security Operation Centers (SOCs) is proposed. It was developed by utilising Systems Engineering best practices, combined with industry-accepted standards and frameworks, such as the TM Forum’s eTOM framework, CoBIT, ITIL, and ISO/IEC 27002:2005. This framework encompasses the design considerations, the operational considerations and the means to measure the effectiveness and efficiency of SOCs. The intent is to provide guidance to consumers on how to compare and measure the capabilities of SOCs provided by disparate service providers, and to provide service providers (internal and external) a framework to use when building and improving their offerings. The importance of providing a consistent, measureable and guaranteed service to customers is becoming more important, as there is an increased focus on holistic management of security. This has in turn resulted in an increased number of both internal and managed service provider solutions. While some frameworks exist for designing, building and operating specific security technologies used within SOCs, we did not find any comprehensive framework for designing, building and managing SOCs. Consequently, consumers of SOCs do not enjoy a constant experience from vendors, and may experience inconsistent services from geographically dispersed offerings provided by the same vendor.
- Full Text:
- Date Issued: 2015
- Authors: Jacobs, Pierre Conrad
- Date: 2015
- Subjects: Security systems industry , Systems engineering , Expert systems (Computer science) , COBIT (Information technology management standard) , Computer security
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4710 , http://hdl.handle.net/10962/d1017932
- Description: In this thesis a framework for Security Operation Centers (SOCs) is proposed. It was developed by utilising Systems Engineering best practices, combined with industry-accepted standards and frameworks, such as the TM Forum’s eTOM framework, CoBIT, ITIL, and ISO/IEC 27002:2005. This framework encompasses the design considerations, the operational considerations and the means to measure the effectiveness and efficiency of SOCs. The intent is to provide guidance to consumers on how to compare and measure the capabilities of SOCs provided by disparate service providers, and to provide service providers (internal and external) a framework to use when building and improving their offerings. The importance of providing a consistent, measureable and guaranteed service to customers is becoming more important, as there is an increased focus on holistic management of security. This has in turn resulted in an increased number of both internal and managed service provider solutions. While some frameworks exist for designing, building and operating specific security technologies used within SOCs, we did not find any comprehensive framework for designing, building and managing SOCs. Consequently, consumers of SOCs do not enjoy a constant experience from vendors, and may experience inconsistent services from geographically dispersed offerings provided by the same vendor.
- Full Text:
- Date Issued: 2015
Towards a Mobile Bioethanol Unit for point of source conversion of sugar sources to bioethanol: design and feasibility study for South Africa
- Authors: Cech, Alexandra Louise
- Date: 2015
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/59141 , vital:27439
- Description: Restricted access-thesis embargoed for 5 years
- Full Text:
- Date Issued: 2015
- Authors: Cech, Alexandra Louise
- Date: 2015
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/59141 , vital:27439
- Description: Restricted access-thesis embargoed for 5 years
- Full Text:
- Date Issued: 2015
Towards an evaluation and protection strategy for critical infrastructure
- Authors: Gottschalk, Jason Howard
- Date: 2015
- Subjects: Computer crimes -- Prevention , Computer networks -- Security measures , Computer crimes -- Law and legislation -- South Africa , Public works -- Security measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4721 , http://hdl.handle.net/10962/d1018793
- Description: Critical Infrastructure is often overlooked from an Information Security perspective as being of high importance to protect which may result in Critical Infrastructure being at risk to Cyber related attacks with potential dire consequences. Furthermore, what is considered Critical Infrastructure is often a complex discussion, with varying opinions across audiences. Traditional Critical Infrastructure included power stations, water, sewage pump stations, gas pipe lines, power grids and a new entrant, the “internet of things”. This list is not complete and a constant challenge exists in identifying Critical Infrastructure and its interdependencies. The purpose of this research is to highlight the importance of protecting Critical Infrastructure as well as proposing a high level framework aiding in the identification and securing of Critical Infrastructure. To achieve this, key case studies involving Cyber crime and Cyber warfare, as well as the identification of attack vectors and impact on against Critical Infrastructure (as applicable to Critical Infrastructure where possible), were identified and discussed. Furthermore industry related material was researched as to identify key controls that would aid in protecting Critical Infrastructure. The identification of initiatives that countries were pursuing, that would aid in the protection of Critical Infrastructure, were identified and discussed. Research was conducted into the various standards, frameworks and methodologies available to aid in the identification, remediation and ultimately the protection of Critical Infrastructure. A key output of the research was the development of a hybrid approach to identifying Critical Infrastructure, associated vulnerabilities and an approach for remediation with specific metrics (based on the research performed). The conclusion based on the research is that there is often a need and a requirement to identify and protect Critical Infrastructure however this is usually initiated or driven by non-owners of Critical Infrastructure (Governments, governing bodies, standards bodies and security consultants). Furthermore where there are active initiative by owners very often the suggested approaches are very high level in nature with little direct guidance available for very immature environments.
- Full Text:
- Date Issued: 2015
- Authors: Gottschalk, Jason Howard
- Date: 2015
- Subjects: Computer crimes -- Prevention , Computer networks -- Security measures , Computer crimes -- Law and legislation -- South Africa , Public works -- Security measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4721 , http://hdl.handle.net/10962/d1018793
- Description: Critical Infrastructure is often overlooked from an Information Security perspective as being of high importance to protect which may result in Critical Infrastructure being at risk to Cyber related attacks with potential dire consequences. Furthermore, what is considered Critical Infrastructure is often a complex discussion, with varying opinions across audiences. Traditional Critical Infrastructure included power stations, water, sewage pump stations, gas pipe lines, power grids and a new entrant, the “internet of things”. This list is not complete and a constant challenge exists in identifying Critical Infrastructure and its interdependencies. The purpose of this research is to highlight the importance of protecting Critical Infrastructure as well as proposing a high level framework aiding in the identification and securing of Critical Infrastructure. To achieve this, key case studies involving Cyber crime and Cyber warfare, as well as the identification of attack vectors and impact on against Critical Infrastructure (as applicable to Critical Infrastructure where possible), were identified and discussed. Furthermore industry related material was researched as to identify key controls that would aid in protecting Critical Infrastructure. The identification of initiatives that countries were pursuing, that would aid in the protection of Critical Infrastructure, were identified and discussed. Research was conducted into the various standards, frameworks and methodologies available to aid in the identification, remediation and ultimately the protection of Critical Infrastructure. A key output of the research was the development of a hybrid approach to identifying Critical Infrastructure, associated vulnerabilities and an approach for remediation with specific metrics (based on the research performed). The conclusion based on the research is that there is often a need and a requirement to identify and protect Critical Infrastructure however this is usually initiated or driven by non-owners of Critical Infrastructure (Governments, governing bodies, standards bodies and security consultants). Furthermore where there are active initiative by owners very often the suggested approaches are very high level in nature with little direct guidance available for very immature environments.
- Full Text:
- Date Issued: 2015
Towards large scale software based network routing simulation
- Authors: Herbert, Alan
- Date: 2015
- Subjects: Routers (Computer networks) , Computer software , Linux
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4709 , http://hdl.handle.net/10962/d1017931
- Description: Software based routing simulators suffer from large simulation host requirements and are prone to slow downs because of resource limitations, as well as context switching due to user space to kernel space requests. Furthermore, hardware based simulations do not scale with the passing of time as their available resources are set at the time of manufacture. This research aims to provide a software based, scalable solution to network simulation. It aims to achieve this by a Linux kernel-based solution, through insertion of a custom kernel module. This will reduce the number of context switches by eliminating the user space context requirement, and serve to be highly compatible with any host that can run the Linux kernel. Through careful consideration in data structure choice and software component design, this routing simulator achieved results of over 7 Gbps of throughput over multiple simulated node hops on consumer hardware. Alongside this throughput, this routing simulator also brings to light scalability and the ability to instantiate and simulate networks in excess of 1 million routing nodes within 1 GB of system memory
- Full Text:
- Date Issued: 2015
- Authors: Herbert, Alan
- Date: 2015
- Subjects: Routers (Computer networks) , Computer software , Linux
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4709 , http://hdl.handle.net/10962/d1017931
- Description: Software based routing simulators suffer from large simulation host requirements and are prone to slow downs because of resource limitations, as well as context switching due to user space to kernel space requests. Furthermore, hardware based simulations do not scale with the passing of time as their available resources are set at the time of manufacture. This research aims to provide a software based, scalable solution to network simulation. It aims to achieve this by a Linux kernel-based solution, through insertion of a custom kernel module. This will reduce the number of context switches by eliminating the user space context requirement, and serve to be highly compatible with any host that can run the Linux kernel. Through careful consideration in data structure choice and software component design, this routing simulator achieved results of over 7 Gbps of throughput over multiple simulated node hops on consumer hardware. Alongside this throughput, this routing simulator also brings to light scalability and the ability to instantiate and simulate networks in excess of 1 million routing nodes within 1 GB of system memory
- Full Text:
- Date Issued: 2015
Transnational habitus : Mariem Hassan as the transcultural representation of the relationship between Saharaui music and Nubenegra records
- Authors: Gimenez Amoros, Luis
- Date: 2015
- Subjects: Hassan, Mariem, 1958- , Nubenegra Records , Sahrawi (African people) -- Music -- Cross-cultural studies , Sahrawi (African people) -- Music -- Foreign influences , Transnationalism , Cross-cultural studies -- Spain
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2697 , http://hdl.handle.net/10962/d1017819
- Description: This thesis expands on primary field research conducted for my MMus degree. Undertaken in the Saharaui refugee camps of southern Algeria (2004-2005) that research - based on ethnographic data and the analysis of Saharaui music, known as Haul ¹- focussed on the musical system, the social context of musical performance and the music culture in Saharaui refugee camps. This doctoral research examines Saharaui Haul music as practised in Spain and is particularly focussed on its entry, since 1998, into the global market by way of the World Music label, Nubenegra records. The encounter between Saharaui musicians and Nubenegra records has created a new type of Saharaui Haul which is different to that played in the refugee camps. This phenomenon has emerged as a result of western music producers compelling Saharaui musicians to introduce musical changes so that both parties may be considered as musical agents occupying different positions on a continuum of tradition and change. Nubenegra undertook the commodification of Saharaui music and disseminated it from the camps to the rest of the world. A musical and social analysis of the relationship between Nubenegra and Saharaui musicians living in Spain will form the basis of the research in this thesis. In particular, Mariem Hassan is an example of a musician who had her music disseminated through the relationship with Nubenegra and she is promoted as the music ambassador of the Western Sahara. I collaborated with her as a composer and performer on her last album, El Aaiun egdat (Aaiun in fire), in 2012² and gained first hand insight into the relationship between Mariem and Nubenegra. This thesis reflects on this relationship and my role in facilitating this encounter.
- Full Text:
- Date Issued: 2015
- Authors: Gimenez Amoros, Luis
- Date: 2015
- Subjects: Hassan, Mariem, 1958- , Nubenegra Records , Sahrawi (African people) -- Music -- Cross-cultural studies , Sahrawi (African people) -- Music -- Foreign influences , Transnationalism , Cross-cultural studies -- Spain
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2697 , http://hdl.handle.net/10962/d1017819
- Description: This thesis expands on primary field research conducted for my MMus degree. Undertaken in the Saharaui refugee camps of southern Algeria (2004-2005) that research - based on ethnographic data and the analysis of Saharaui music, known as Haul ¹- focussed on the musical system, the social context of musical performance and the music culture in Saharaui refugee camps. This doctoral research examines Saharaui Haul music as practised in Spain and is particularly focussed on its entry, since 1998, into the global market by way of the World Music label, Nubenegra records. The encounter between Saharaui musicians and Nubenegra records has created a new type of Saharaui Haul which is different to that played in the refugee camps. This phenomenon has emerged as a result of western music producers compelling Saharaui musicians to introduce musical changes so that both parties may be considered as musical agents occupying different positions on a continuum of tradition and change. Nubenegra undertook the commodification of Saharaui music and disseminated it from the camps to the rest of the world. A musical and social analysis of the relationship between Nubenegra and Saharaui musicians living in Spain will form the basis of the research in this thesis. In particular, Mariem Hassan is an example of a musician who had her music disseminated through the relationship with Nubenegra and she is promoted as the music ambassador of the Western Sahara. I collaborated with her as a composer and performer on her last album, El Aaiun egdat (Aaiun in fire), in 2012² and gained first hand insight into the relationship between Mariem and Nubenegra. This thesis reflects on this relationship and my role in facilitating this encounter.
- Full Text:
- Date Issued: 2015
Tug of war : a critical discourse analysis of Punch and Daily Trust newspapers' coverage of polio eradication in Nigeria
- Authors: Oyewo, Ayanfeoluwa Olutosin
- Date: 2015
- Subjects: Punch (Nigeria) , Daily Trust (Nigeria) , Poliomyelitis -- Nigeria , Communication in medicine -- Nigeria , Journalism -- Political aspects -- Nigeria , Journalistic ethics -- Nigeria , Journalism -- Objectivity -- Nigeria , Critical discourse analysis
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3546 , http://hdl.handle.net/10962/d1017787
- Description: The resurgence of the polio virus in Nigeria following vaccine rejections poses a severe threat to the total worldwide eradication of polio. Vaccine refusals are a huge problem in Nigeria, especially in the North, which accounts for about 60 percent of polio cases in 2013. These refusals were informed by claims that polio vaccines contained anti-fertility properties that were designed by the ‘West’ to reduce the Muslim population. These claims and subsequent vaccine rejections culminated in the killing of health workers during an immunisation exercise in February 2013. This study is an analysis of the coverage of the polio eradication controversy by two newspapers- Punch and Daily Trust, following the killings of the health workers. Daily Trust is situated in Northern Nigeria, while Punch is situated in the South. The choice of these newspapers is based on the argument by Ayodele (1988) and Omenugha (2004) that the Nigerian press has been accused of escalating tension in the country because they view many aspects of the Nigerian reality from the lenses of religious, political and cultural prejudices. Because it is a text-based study, the chosen research method is Fairclough’s (1995) model of Critical Discourse Analysis (CDA), following a preliminary thematic content analysis. In addition to Fairclough’s model, the study employs textual analytic tools such as narrative analysis and rhetoric/argumentative analysis. The selected texts, which comprise editorials and news stories are analysed based on the themes identified during the thematic content analysis. The study concludes that while the two newspapers differ in their locations and stylistic approach to news, they are similar in their coverage of the polio eradication crisis. They both side with the Federal Government and help perpetuate the South versus North animosity thereby ignoring the intricacies involved in the polio eradication controversy.
- Full Text:
- Date Issued: 2015
- Authors: Oyewo, Ayanfeoluwa Olutosin
- Date: 2015
- Subjects: Punch (Nigeria) , Daily Trust (Nigeria) , Poliomyelitis -- Nigeria , Communication in medicine -- Nigeria , Journalism -- Political aspects -- Nigeria , Journalistic ethics -- Nigeria , Journalism -- Objectivity -- Nigeria , Critical discourse analysis
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3546 , http://hdl.handle.net/10962/d1017787
- Description: The resurgence of the polio virus in Nigeria following vaccine rejections poses a severe threat to the total worldwide eradication of polio. Vaccine refusals are a huge problem in Nigeria, especially in the North, which accounts for about 60 percent of polio cases in 2013. These refusals were informed by claims that polio vaccines contained anti-fertility properties that were designed by the ‘West’ to reduce the Muslim population. These claims and subsequent vaccine rejections culminated in the killing of health workers during an immunisation exercise in February 2013. This study is an analysis of the coverage of the polio eradication controversy by two newspapers- Punch and Daily Trust, following the killings of the health workers. Daily Trust is situated in Northern Nigeria, while Punch is situated in the South. The choice of these newspapers is based on the argument by Ayodele (1988) and Omenugha (2004) that the Nigerian press has been accused of escalating tension in the country because they view many aspects of the Nigerian reality from the lenses of religious, political and cultural prejudices. Because it is a text-based study, the chosen research method is Fairclough’s (1995) model of Critical Discourse Analysis (CDA), following a preliminary thematic content analysis. In addition to Fairclough’s model, the study employs textual analytic tools such as narrative analysis and rhetoric/argumentative analysis. The selected texts, which comprise editorials and news stories are analysed based on the themes identified during the thematic content analysis. The study concludes that while the two newspapers differ in their locations and stylistic approach to news, they are similar in their coverage of the polio eradication crisis. They both side with the Federal Government and help perpetuate the South versus North animosity thereby ignoring the intricacies involved in the polio eradication controversy.
- Full Text:
- Date Issued: 2015
Uncertainties in modelling hydrological responses in gauged and ungauged sub‐basins
- Authors: Tumbo, Madaka Harold
- Date: 2015
- Subjects: Hydrologic models , Watersheds -- Tanzania , Water-supply -- Tanzania -- Great Ruaha River Watershed , Water resources development -- Tanzania -- Great Ruaha River Watershed , Rain and rainfall -- Mathematical models , Rain gauges -- Tanzania -- Great Ruaha River Watershed , Great Ruaha River Watershed (Tanzania)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6053 , http://hdl.handle.net/10962/d1018568
- Description: The world is undergoing rapid changes and the future is uncertain. The changes are related to modification of the landscape due to human activities, such as large and small scale irrigation, afforestation and changes to the climate system. Understanding and predicting hydrologic change is one of the challenges facing hydrologists today. Part of this understanding can be developed from observed data, however, there often too few observations and those that are available are frequently affected by uncertainties. Hydrological models have become essential tools for understanding historical variations of catchment hydrology and for predicting future possible trends. However, most developing countries are faced with poor spatial distributions of rainfall and evaporation stations that provide the data used to force models, as well as stream flow gauging stations to provide the data for establishing models and for evaluating their success. Hydrological models are faced with a number of challenges which include poor input data (data quality and poorly quantified human activities on observed stream flow data), uncertainties associated with model complexity and structure, the methods used to quantify model parameters, together with the difficulties of understanding hydrological processes at the catchment or subbasin. Within hydrological modelling, there is currently a trend of dealing with equifinality through the evaluation of parameter identifiability and the quantification of uncertainty bands associated with the predictions of the model. Hydrological models should not only focus on reproducing the past behaviour of a basin, but also on evaluating the representativeness of the surface and subsurface model components and their ability to simulate reality for the correct reasons. Part of this modelling process therefore involves quantifying and including all the possible sources of uncertainty. Uncertainty analysis has become the standard approach to most hydrological modelling studies, but has yet to be effectively used in practical water resources assessment. This study applied a hydrological modelling approach for understanding the hydrology of a large Tanzanian drainage basin, the Great Ruaha River that has many areas that are ungauged and where the available data (climate, stream flow and existing water use) are subject to varying degrees of uncertainty. The Great Ruaha River (GRR) is an upstream tributary of the Rufiji River Basin within Tanzania and covers an area of 86 000 km2. The basin is drained by four main tributaries; the Upper Great Ruaha, the Kisigo, the Little Ruaha and the Lukosi. The majority of the runoff is generated from the Chunya escarpment, the Kipengere ranges and the Poroto Mountains. The runoff generated feeds the alluvial and seasonally flooded Usangu plains (including the Ihefu perennial swamp). The majority of the irrigation water use in the basin is located where headwater sub‐basins drain towards the Usangu plains. The overall objective was to establish uncertain but behavioural hydrological models that could be useful for future water resources assessments that are likely to include issues of land use change, changes in patterns of abstraction and water use, as well the possibility of change in future climates.
- Full Text:
- Date Issued: 2015
- Authors: Tumbo, Madaka Harold
- Date: 2015
- Subjects: Hydrologic models , Watersheds -- Tanzania , Water-supply -- Tanzania -- Great Ruaha River Watershed , Water resources development -- Tanzania -- Great Ruaha River Watershed , Rain and rainfall -- Mathematical models , Rain gauges -- Tanzania -- Great Ruaha River Watershed , Great Ruaha River Watershed (Tanzania)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6053 , http://hdl.handle.net/10962/d1018568
- Description: The world is undergoing rapid changes and the future is uncertain. The changes are related to modification of the landscape due to human activities, such as large and small scale irrigation, afforestation and changes to the climate system. Understanding and predicting hydrologic change is one of the challenges facing hydrologists today. Part of this understanding can be developed from observed data, however, there often too few observations and those that are available are frequently affected by uncertainties. Hydrological models have become essential tools for understanding historical variations of catchment hydrology and for predicting future possible trends. However, most developing countries are faced with poor spatial distributions of rainfall and evaporation stations that provide the data used to force models, as well as stream flow gauging stations to provide the data for establishing models and for evaluating their success. Hydrological models are faced with a number of challenges which include poor input data (data quality and poorly quantified human activities on observed stream flow data), uncertainties associated with model complexity and structure, the methods used to quantify model parameters, together with the difficulties of understanding hydrological processes at the catchment or subbasin. Within hydrological modelling, there is currently a trend of dealing with equifinality through the evaluation of parameter identifiability and the quantification of uncertainty bands associated with the predictions of the model. Hydrological models should not only focus on reproducing the past behaviour of a basin, but also on evaluating the representativeness of the surface and subsurface model components and their ability to simulate reality for the correct reasons. Part of this modelling process therefore involves quantifying and including all the possible sources of uncertainty. Uncertainty analysis has become the standard approach to most hydrological modelling studies, but has yet to be effectively used in practical water resources assessment. This study applied a hydrological modelling approach for understanding the hydrology of a large Tanzanian drainage basin, the Great Ruaha River that has many areas that are ungauged and where the available data (climate, stream flow and existing water use) are subject to varying degrees of uncertainty. The Great Ruaha River (GRR) is an upstream tributary of the Rufiji River Basin within Tanzania and covers an area of 86 000 km2. The basin is drained by four main tributaries; the Upper Great Ruaha, the Kisigo, the Little Ruaha and the Lukosi. The majority of the runoff is generated from the Chunya escarpment, the Kipengere ranges and the Poroto Mountains. The runoff generated feeds the alluvial and seasonally flooded Usangu plains (including the Ihefu perennial swamp). The majority of the irrigation water use in the basin is located where headwater sub‐basins drain towards the Usangu plains. The overall objective was to establish uncertain but behavioural hydrological models that could be useful for future water resources assessments that are likely to include issues of land use change, changes in patterns of abstraction and water use, as well the possibility of change in future climates.
- Full Text:
- Date Issued: 2015
Understanding climate variability and livelihoods adaptation in rural Zimbabwe : case of Charewa, Mutoko
- Authors: Bhatasara, Sandra
- Date: 2015
- Subjects: Climatic changes -- Zimbabwe -- Mutoko , Sustainable agriculture -- Zimbabwe -- Mutoko , Environmental impact analysis -- Zimbabwe -- Mutoko , Farmers -- Zimbabwe -- Mutoko -- Economic conditions , Food supply -- Zimbabwe -- Mutoko , Farms -- Zimbabwe -- Mutoko , Land use, Rural -- Zimbabwe -- Mutoko , Crops and climate -- Zimbabwe -- Mutoko
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3403 , http://hdl.handle.net/10962/d1018928 , Climatic changes -- Zimbabwe -- Mutoko , Sustainable agriculture -- Zimbabwe -- Mutoko , Environmental impact analysis -- Zimbabwe -- Mutoko , Farmers -- Zimbabwe -- Mutoko -- Economic conditions , Food supply -- Zimbabwe -- Mutoko , Farms -- Zimbabwe -- Mutoko , Land use, Rural -- Zimbabwe -- Mutoko , Crops and climate -- Zimbabwe -- Mutoko
- Description: Rural farmers in Zimbabwe have been grappling with various changes and challenges occurring in the country since the early 1990s. Amongst these, climate variability has emerged as one significant aspect. It has introduced new challenges for these farmers who are already facing various difficulties in maintaining their insecure livelihoods. Yet, current adaptation theories and inquiries have failed to sufficiently account for and analyse the capacity of these farmers to adequately respond to changing climatic conditions. In this respect, a number of studies have been heavily embedded in deterministic concepts that regard rural farmers as passive victims who play only a minor part in decisions and actions that affect their own livelihoods and well-being. Similarly, although some studies have acknowledged farmers’ capacity to adapt and build elements of resilience, they have not adequately shown how farmers interpret changes in climate and the structures, processes and conditions underpinning adaptation. Following that, my study uses a case study of a rural community in a semi-arid region of Mutoko district in eastern Zimbabwe and Margaret Archer’s sociological theory to understand and analyse how farmers problematise climate variability and respond to it. The study utilises a qualitative approach to divulge the subtleties on how rural people interpret processes of change and adapt to such changes. The thesis found that farmers are encountering increasingly unpredictable and unreliable rainfall patterns as well as shifting temperature conditions which are inducing labyrinthian livelihoods conundrums. However, these climatic shifts are not being experienced in a discrete manner hence farmers are also discontented with the obtaining socio-economic circumstances in the country. Simultaneously, whilst farmers in large part conceived changes in rainfall and temperature to be caused by natural shifts in climate, they also ascribed them to cultural and religious facets. Importantly, the thesis reveals considerable resourcefulness by farmers in the face of nascent changes in climate variability. Farmers have therefore constructed versatile coping and adaptive strategies. What is crucial to mention here is that climatic and non-climatic challenges are negotiated concurrently. Therein, farmers are adapting to climate variability and at the same time navigating difficult socio-economic landscapes. All the same, the process of adaptation is ostensibly not straightforward but complex. As it evolves, farmers find themselves facing numerous constraining structures and processes. Nonetheless, farmers in this study are able to circumvent the constraints presented to them and at the same time activate the corresponding enabling structures, processes and conditions.
- Full Text:
- Date Issued: 2015
- Authors: Bhatasara, Sandra
- Date: 2015
- Subjects: Climatic changes -- Zimbabwe -- Mutoko , Sustainable agriculture -- Zimbabwe -- Mutoko , Environmental impact analysis -- Zimbabwe -- Mutoko , Farmers -- Zimbabwe -- Mutoko -- Economic conditions , Food supply -- Zimbabwe -- Mutoko , Farms -- Zimbabwe -- Mutoko , Land use, Rural -- Zimbabwe -- Mutoko , Crops and climate -- Zimbabwe -- Mutoko
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3403 , http://hdl.handle.net/10962/d1018928 , Climatic changes -- Zimbabwe -- Mutoko , Sustainable agriculture -- Zimbabwe -- Mutoko , Environmental impact analysis -- Zimbabwe -- Mutoko , Farmers -- Zimbabwe -- Mutoko -- Economic conditions , Food supply -- Zimbabwe -- Mutoko , Farms -- Zimbabwe -- Mutoko , Land use, Rural -- Zimbabwe -- Mutoko , Crops and climate -- Zimbabwe -- Mutoko
- Description: Rural farmers in Zimbabwe have been grappling with various changes and challenges occurring in the country since the early 1990s. Amongst these, climate variability has emerged as one significant aspect. It has introduced new challenges for these farmers who are already facing various difficulties in maintaining their insecure livelihoods. Yet, current adaptation theories and inquiries have failed to sufficiently account for and analyse the capacity of these farmers to adequately respond to changing climatic conditions. In this respect, a number of studies have been heavily embedded in deterministic concepts that regard rural farmers as passive victims who play only a minor part in decisions and actions that affect their own livelihoods and well-being. Similarly, although some studies have acknowledged farmers’ capacity to adapt and build elements of resilience, they have not adequately shown how farmers interpret changes in climate and the structures, processes and conditions underpinning adaptation. Following that, my study uses a case study of a rural community in a semi-arid region of Mutoko district in eastern Zimbabwe and Margaret Archer’s sociological theory to understand and analyse how farmers problematise climate variability and respond to it. The study utilises a qualitative approach to divulge the subtleties on how rural people interpret processes of change and adapt to such changes. The thesis found that farmers are encountering increasingly unpredictable and unreliable rainfall patterns as well as shifting temperature conditions which are inducing labyrinthian livelihoods conundrums. However, these climatic shifts are not being experienced in a discrete manner hence farmers are also discontented with the obtaining socio-economic circumstances in the country. Simultaneously, whilst farmers in large part conceived changes in rainfall and temperature to be caused by natural shifts in climate, they also ascribed them to cultural and religious facets. Importantly, the thesis reveals considerable resourcefulness by farmers in the face of nascent changes in climate variability. Farmers have therefore constructed versatile coping and adaptive strategies. What is crucial to mention here is that climatic and non-climatic challenges are negotiated concurrently. Therein, farmers are adapting to climate variability and at the same time navigating difficult socio-economic landscapes. All the same, the process of adaptation is ostensibly not straightforward but complex. As it evolves, farmers find themselves facing numerous constraining structures and processes. Nonetheless, farmers in this study are able to circumvent the constraints presented to them and at the same time activate the corresponding enabling structures, processes and conditions.
- Full Text:
- Date Issued: 2015
Understanding Grade 10 Life Sciences teachers’ perceptions and experiences of teaching topics on human reproduction
- Authors: Silas, Fenni
- Date: 2015
- Subjects: Life sciences -- Study and teaching (Secondary) , Human reproduction -- Cross-cultural studies , Human reproduction -- Social aspects -- Namibia -- Ohangwena , Ohangwena (Namibia) -- Moral conditions , Taboo -- Namibia -- Ohangwena
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2062 , http://hdl.handle.net/10962/d1020305
- Description: This study was conducted in order to understand Grade 10 Life Science teachers’ perceptions and experiences of teaching human reproduction topics in the Ohangwena political region in the northern part of Namibia. It also explored how the culture of the majority of the inhabitants of Ohangwena region who are Oshiwambo speaking impacts the teaching of human reproduction topics. The study was prompted by the fact that the Grade 10 Life Science syllabus requires learners to learn details of human reproduction although in Oshiwambo culture such things are not discussed openly. And this section has proven to be one of the poorly answered sections in the Grade 10 national examinations. A total of thirty five (35) Grade 10 Life Science teachers participated in this study. It is a qualitative case study underpinned by an interpretive paradigm. The unit of analysis for this study was teachers’ perceptions and experiences of teaching the topic of human reproduction. Data were generated through document analysis, questionnaires and tape recorded semi-structured interviews. Such data were analysed inductively by sorting them into categories and then into emerging themes. Categories included teachers’ views and experiences of being taught and teaching human reproduction, how culture influenced the manner in which teaching and learning of human reproduction takes place as stated in the socio-cultural theory, and how teachers of different gender perceived and experienced the teaching of human reproduction according to the feminist standpoint theory. The emerging themes were colour coded and then developed into analytical statements. Data triangulation, member checking, and follow up interviews ensured data validity and trustworthiness. This study revealed that the cultural belief of the Owambo people that prohibits adults to talk to children about things related to sex because it encourages them to practice sex is still strong among individuals in the community including teachers themselves. As a result, teachers are not comfortable with teaching human reproduction topics. From the findings, it is recommended that teachers should be empowered to teach Life Science, specifically human reproduction topics, with confidence. Furthermore, parents should be made aware of the importance of including human reproduction topics in the school curriculum so that they can motivate their children to study it with an open mind.
- Full Text:
- Date Issued: 2015
- Authors: Silas, Fenni
- Date: 2015
- Subjects: Life sciences -- Study and teaching (Secondary) , Human reproduction -- Cross-cultural studies , Human reproduction -- Social aspects -- Namibia -- Ohangwena , Ohangwena (Namibia) -- Moral conditions , Taboo -- Namibia -- Ohangwena
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2062 , http://hdl.handle.net/10962/d1020305
- Description: This study was conducted in order to understand Grade 10 Life Science teachers’ perceptions and experiences of teaching human reproduction topics in the Ohangwena political region in the northern part of Namibia. It also explored how the culture of the majority of the inhabitants of Ohangwena region who are Oshiwambo speaking impacts the teaching of human reproduction topics. The study was prompted by the fact that the Grade 10 Life Science syllabus requires learners to learn details of human reproduction although in Oshiwambo culture such things are not discussed openly. And this section has proven to be one of the poorly answered sections in the Grade 10 national examinations. A total of thirty five (35) Grade 10 Life Science teachers participated in this study. It is a qualitative case study underpinned by an interpretive paradigm. The unit of analysis for this study was teachers’ perceptions and experiences of teaching the topic of human reproduction. Data were generated through document analysis, questionnaires and tape recorded semi-structured interviews. Such data were analysed inductively by sorting them into categories and then into emerging themes. Categories included teachers’ views and experiences of being taught and teaching human reproduction, how culture influenced the manner in which teaching and learning of human reproduction takes place as stated in the socio-cultural theory, and how teachers of different gender perceived and experienced the teaching of human reproduction according to the feminist standpoint theory. The emerging themes were colour coded and then developed into analytical statements. Data triangulation, member checking, and follow up interviews ensured data validity and trustworthiness. This study revealed that the cultural belief of the Owambo people that prohibits adults to talk to children about things related to sex because it encourages them to practice sex is still strong among individuals in the community including teachers themselves. As a result, teachers are not comfortable with teaching human reproduction topics. From the findings, it is recommended that teachers should be empowered to teach Life Science, specifically human reproduction topics, with confidence. Furthermore, parents should be made aware of the importance of including human reproduction topics in the school curriculum so that they can motivate their children to study it with an open mind.
- Full Text:
- Date Issued: 2015
Understanding how Grade 11 Biology teachers mediate learning of respiration: A Namibian case study
- Authors: Amutenya, Laina N
- Date: 2015
- Subjects: Biology -- Study and teaching (Secondary) -- Namibia , Respiration -- Study and teaching (Secondary) -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2020 , http://hdl.handle.net/10962/d1017331
- Description: The new curriculum in Namibia has introduced a new approach to teaching and learning requiring teachers to make use of learners’ prior everyday knowledge (PEK) including indigenous knowledge (IK) and practical work/activities. It further emphasizes some variations in teaching methods such as; the use of analogies, the use of mind maps, and so forth with the aim to actively involve learners in the learning process and develop skills to solve global challenges. The emphasis is on understanding of knowledge, skills and the will to use them appropriately throughout their lives. The main aim of this study was to understand and document how Biology teachers mediate learning of the topic respiration. Informed by an interpretive paradigm, a qualitative case study was conducted at two secondary schools in the Kunene region. The participants were selected using a convenience sampling. Data were gathered using three main sources, namely, documents, semi-structured interview questions which culminated into a questionnaire and observations. Triangulation was thus used to give credibility, objectivity and validity to the interpretation of the data. Data analysis in this case study involved a multi-stage process of organizing, coding and categorizing, synthesizing and summarizing. The audio recorded lessons were transcribed into text and I analyzed data using a colour coding technique by segmenting and labelling text to identify descriptions and broad themes in the data. Vygotsky’s Mediation of Learning and Social Constructivism in conjunction with Shulman’s Pedagogical Content Knowledge (PCK) informed the data analysis process. Teacher-learner interactions were the main theme for mediation of learning (social constructivist perspective), hence during analysis I paid more attention to moments where interactions evolved and I used PCK to gain insights in teaching and instructional strategies used by teachers. The findings of this study revealed that: 1) teachers endeavor to use a variety of teaching methods such as the use of a mind maps and question and answer method. Learners were keen to ask questions in order to understand this topic. 2) The study also revealed that a lack of practical activities is one of the challenges teachers are faced with. Based on my research findings, I therefore suggest that there is a need for continuous professional development of biology teachers and capacity building in order to improve both their content and pedagogical content knowledge.
- Full Text:
- Date Issued: 2015
- Authors: Amutenya, Laina N
- Date: 2015
- Subjects: Biology -- Study and teaching (Secondary) -- Namibia , Respiration -- Study and teaching (Secondary) -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:2020 , http://hdl.handle.net/10962/d1017331
- Description: The new curriculum in Namibia has introduced a new approach to teaching and learning requiring teachers to make use of learners’ prior everyday knowledge (PEK) including indigenous knowledge (IK) and practical work/activities. It further emphasizes some variations in teaching methods such as; the use of analogies, the use of mind maps, and so forth with the aim to actively involve learners in the learning process and develop skills to solve global challenges. The emphasis is on understanding of knowledge, skills and the will to use them appropriately throughout their lives. The main aim of this study was to understand and document how Biology teachers mediate learning of the topic respiration. Informed by an interpretive paradigm, a qualitative case study was conducted at two secondary schools in the Kunene region. The participants were selected using a convenience sampling. Data were gathered using three main sources, namely, documents, semi-structured interview questions which culminated into a questionnaire and observations. Triangulation was thus used to give credibility, objectivity and validity to the interpretation of the data. Data analysis in this case study involved a multi-stage process of organizing, coding and categorizing, synthesizing and summarizing. The audio recorded lessons were transcribed into text and I analyzed data using a colour coding technique by segmenting and labelling text to identify descriptions and broad themes in the data. Vygotsky’s Mediation of Learning and Social Constructivism in conjunction with Shulman’s Pedagogical Content Knowledge (PCK) informed the data analysis process. Teacher-learner interactions were the main theme for mediation of learning (social constructivist perspective), hence during analysis I paid more attention to moments where interactions evolved and I used PCK to gain insights in teaching and instructional strategies used by teachers. The findings of this study revealed that: 1) teachers endeavor to use a variety of teaching methods such as the use of a mind maps and question and answer method. Learners were keen to ask questions in order to understand this topic. 2) The study also revealed that a lack of practical activities is one of the challenges teachers are faced with. Based on my research findings, I therefore suggest that there is a need for continuous professional development of biology teachers and capacity building in order to improve both their content and pedagogical content knowledge.
- Full Text:
- Date Issued: 2015