A geological evaluation of marine diamond placer deposits on the central Namibian inner shelf : a case study of the Hottentot Bay area
- Authors: Rau, Grant
- Date: 2004 , 2013-06-03
- Subjects: Diamond mines and mining -- Namibia , Ocean mining -- Namibia , Marine mineral resources
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5038 , http://hdl.handle.net/10962/d1007554 , Diamond mines and mining -- Namibia , Ocean mining -- Namibia , Marine mineral resources
- Description: This study focusses on the marine diamond placers within Exclusive Prospecting Licence 1950 and Mining Licence 103a, located northwest of the north-facing Hottentot Bay which is 60 km north of Lüderitz, along the central Namibian coastline. The thesis follows the natural geological evolution of the marine placer deposit from primary source, through alluvial and/or glacial transportation, concentration along the coastline by wave, aeolian and alluvial/sheet-wash processes and finally marine diamond placer preservation. All of these processes are reviewed as they are important in understanding of the evolution marine placer deposits. The poly-cyclic role of coastal aeolian, alluvial, and marine processes, in marine placer enrichment is shown to be particularly important in considered target identification and prioritisation. A detailed bathymetric, sonographic and seismic interpretation, is an integral part of diamond placer exploration, and was used to examine and describe surficial and sub-bottom characteristics within the study area. Marine placers are formed along palaeo-strandlines during periods of marine transgression and regression and are therefore fundamental in marine placer exploration. A detailed bathymetry map, compiled for this study, of the area between Lüderitz Bay and Clara Hill, provides the foundation for a detailed terrace level investigation. Regionally, twelve well-developed stillstand levels are identified, nine of which fall into the study area. These interpretations are compared with global eustatic as well as terrace and resource/reserve levels in the Lüderitz area and are found to correlate well. Sediment dynamic studies involve the use of accredited application software for wave refraction modelling, to determine the wave angle and orbital wave velocity at the seabed. Bedload velocities, required to move diamonds of specific sizes, can be empirically determined and therefore areas of diamond entrainment and deposition can be modelled and target features delineated and prioritised. These detailed interpretations provide a sound platform for evaluating diamond placer process models in the study area. By integrating both previously published and newly formulated ideas, a revised, holistic model for the formation of marine diamond placer deposits in central Namibian is postulated. The proposed model is tested by comparing it to the lateral distribution of presently defined resource/reserve areas in the Lüderitz area and shows a close correlation with most of these enriched deposits. Based on this model, a matrix for the delineation and prioritisation of marine placer deposits is developed and the best target features within the study area are identified. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2004
- Authors: Rau, Grant
- Date: 2004 , 2013-06-03
- Subjects: Diamond mines and mining -- Namibia , Ocean mining -- Namibia , Marine mineral resources
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5038 , http://hdl.handle.net/10962/d1007554 , Diamond mines and mining -- Namibia , Ocean mining -- Namibia , Marine mineral resources
- Description: This study focusses on the marine diamond placers within Exclusive Prospecting Licence 1950 and Mining Licence 103a, located northwest of the north-facing Hottentot Bay which is 60 km north of Lüderitz, along the central Namibian coastline. The thesis follows the natural geological evolution of the marine placer deposit from primary source, through alluvial and/or glacial transportation, concentration along the coastline by wave, aeolian and alluvial/sheet-wash processes and finally marine diamond placer preservation. All of these processes are reviewed as they are important in understanding of the evolution marine placer deposits. The poly-cyclic role of coastal aeolian, alluvial, and marine processes, in marine placer enrichment is shown to be particularly important in considered target identification and prioritisation. A detailed bathymetric, sonographic and seismic interpretation, is an integral part of diamond placer exploration, and was used to examine and describe surficial and sub-bottom characteristics within the study area. Marine placers are formed along palaeo-strandlines during periods of marine transgression and regression and are therefore fundamental in marine placer exploration. A detailed bathymetry map, compiled for this study, of the area between Lüderitz Bay and Clara Hill, provides the foundation for a detailed terrace level investigation. Regionally, twelve well-developed stillstand levels are identified, nine of which fall into the study area. These interpretations are compared with global eustatic as well as terrace and resource/reserve levels in the Lüderitz area and are found to correlate well. Sediment dynamic studies involve the use of accredited application software for wave refraction modelling, to determine the wave angle and orbital wave velocity at the seabed. Bedload velocities, required to move diamonds of specific sizes, can be empirically determined and therefore areas of diamond entrainment and deposition can be modelled and target features delineated and prioritised. These detailed interpretations provide a sound platform for evaluating diamond placer process models in the study area. By integrating both previously published and newly formulated ideas, a revised, holistic model for the formation of marine diamond placer deposits in central Namibian is postulated. The proposed model is tested by comparing it to the lateral distribution of presently defined resource/reserve areas in the Lüderitz area and shows a close correlation with most of these enriched deposits. Based on this model, a matrix for the delineation and prioritisation of marine placer deposits is developed and the best target features within the study area are identified. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2004
English language teaching and learning in the African preschool and educational achievement at grade 1: a case study
- Authors: Rendel, Philip Boudewijn
- Date: 2004
- Subjects: Education, Preschool -- South Africa -- Case studies , English language -- Study and teaching (Preschool) -- South Africa Case studies , English language -- Study and teaching (Elementary) -- South Africa -- Case studies , Children -- South Africa -- Language -- Case studies , Language acquisition -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2360 , http://hdl.handle.net/10962/d1002643 , Education, Preschool -- South Africa -- Case studies , English language -- Study and teaching (Preschool) -- South Africa Case studies , English language -- Study and teaching (Elementary) -- South Africa -- Case studies , Children -- South Africa -- Language -- Case studies , Language acquisition -- Case studies
- Description: In 1998, seventy per cent of children in South Africa failed and had to repeat the Grade 1 year. This is the result of a number of factors, among them academic and cultural readiness for school. Many primary schools in South Africa teach through English, a language that is not the home language of the majority of learners. Despite recent legislation aimed at improving preschool facilities and teacher capacity, there has been insufficient consideration of which languages are taught and how they should be taught to children before they arrive at Grade 1. This study sets out to explore whether there is a relational link between preschool English language teaching and learning and subsequent educational achievement at Grade 1. It also sketches out possible recommendations for improving the teaching and learning of English in the sample schools. The study does not attempt to enter the debate over choice of language of teaching and learning (LoLT). In this longitudinal case study, four children from two different preschools, (one mainly isiXhosa medium and one English medium), were observed in their classroom environments over a period of four months. The following year, the same children were observed in their respective Grade 1 classrooms, all of which were English medium either entirely or to a degree. The parents of all four children were interviewed in their home environment, as were their teachers. The study found that there is a significant communication gap between preschool teachers and Grade 1 teachers. This was combined with a self-confessed need amongst some teachers for increased training in teaching through English. Low motivation and limited professional experience in some cases contributed to a preschool language-learning environment that lacked many of the factors identified as being essential for a positive learning environment in early childhood There was in addition a clear bias in many sites towards universality of ECD prinCiples with little regard for the hegemony of Western pedagogy, particularly in the area of literacy acquisition. The study concludes by suggesting some ways in which this situation could be improved in order to enable preschool children to cope better with the demands of Grade 1.
- Full Text:
- Date Issued: 2004
- Authors: Rendel, Philip Boudewijn
- Date: 2004
- Subjects: Education, Preschool -- South Africa -- Case studies , English language -- Study and teaching (Preschool) -- South Africa Case studies , English language -- Study and teaching (Elementary) -- South Africa -- Case studies , Children -- South Africa -- Language -- Case studies , Language acquisition -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2360 , http://hdl.handle.net/10962/d1002643 , Education, Preschool -- South Africa -- Case studies , English language -- Study and teaching (Preschool) -- South Africa Case studies , English language -- Study and teaching (Elementary) -- South Africa -- Case studies , Children -- South Africa -- Language -- Case studies , Language acquisition -- Case studies
- Description: In 1998, seventy per cent of children in South Africa failed and had to repeat the Grade 1 year. This is the result of a number of factors, among them academic and cultural readiness for school. Many primary schools in South Africa teach through English, a language that is not the home language of the majority of learners. Despite recent legislation aimed at improving preschool facilities and teacher capacity, there has been insufficient consideration of which languages are taught and how they should be taught to children before they arrive at Grade 1. This study sets out to explore whether there is a relational link between preschool English language teaching and learning and subsequent educational achievement at Grade 1. It also sketches out possible recommendations for improving the teaching and learning of English in the sample schools. The study does not attempt to enter the debate over choice of language of teaching and learning (LoLT). In this longitudinal case study, four children from two different preschools, (one mainly isiXhosa medium and one English medium), were observed in their classroom environments over a period of four months. The following year, the same children were observed in their respective Grade 1 classrooms, all of which were English medium either entirely or to a degree. The parents of all four children were interviewed in their home environment, as were their teachers. The study found that there is a significant communication gap between preschool teachers and Grade 1 teachers. This was combined with a self-confessed need amongst some teachers for increased training in teaching through English. Low motivation and limited professional experience in some cases contributed to a preschool language-learning environment that lacked many of the factors identified as being essential for a positive learning environment in early childhood There was in addition a clear bias in many sites towards universality of ECD prinCiples with little regard for the hegemony of Western pedagogy, particularly in the area of literacy acquisition. The study concludes by suggesting some ways in which this situation could be improved in order to enable preschool children to cope better with the demands of Grade 1.
- Full Text:
- Date Issued: 2004
Laboratory investigation of a simulated industrial task pre- and post-ergonomics intervention
- Authors: Renz, Miriam Christina
- Date: 2004
- Subjects: Human engineering , Musculoskeletal system -- Diseases , Occupational diseases
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5162 , http://hdl.handle.net/10962/d1015806
- Description: The focus of the present study was on the investigation of the effects of an intervention strategy on an industrial task in situ and a simulation of the same task within a laboratory setting. The task of offloading crates from a truck at a local business was simulated in a laboratory setting for rigorous analysis. The effect of an ergonomically sound intervention on selected physical, physiological and perceptual variables was evaluated in a test - retest experimental set-up using 28 young, healthy male students. Each of the two experimental conditions lasted for 16 minutes. In the pre-intervention task subjects were required to transfer the crates from one point to another by sliding them along the floor. During the execution of the post-intervention task responses to reductions in the stacking height and modifications of the working method were evaluated. Results obtained for spinal kinematics during the simulated industrial task indicated a high biomechanical risk, due to large ranges of motion, high velocities and accelerations in the sagittal and transverse planes. The heavy workload of the task was also evident in elevated physiological responses (HR, RF, VT, VE, VO2, RQ, EE) and perceptual ratings (RPE, Body Discomfort). Assessment of the intervention strategy revealed that the high risk industrial task was reduced to moderate acceptable, with measurements of spinal kinematics, physiological and perceptual variables being significantly reduced. An in situ re-assessment of the workers responses to the intervention also elicited reductions in heart rates and perceptual ratings compared to the original task.
- Full Text:
- Date Issued: 2004
- Authors: Renz, Miriam Christina
- Date: 2004
- Subjects: Human engineering , Musculoskeletal system -- Diseases , Occupational diseases
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5162 , http://hdl.handle.net/10962/d1015806
- Description: The focus of the present study was on the investigation of the effects of an intervention strategy on an industrial task in situ and a simulation of the same task within a laboratory setting. The task of offloading crates from a truck at a local business was simulated in a laboratory setting for rigorous analysis. The effect of an ergonomically sound intervention on selected physical, physiological and perceptual variables was evaluated in a test - retest experimental set-up using 28 young, healthy male students. Each of the two experimental conditions lasted for 16 minutes. In the pre-intervention task subjects were required to transfer the crates from one point to another by sliding them along the floor. During the execution of the post-intervention task responses to reductions in the stacking height and modifications of the working method were evaluated. Results obtained for spinal kinematics during the simulated industrial task indicated a high biomechanical risk, due to large ranges of motion, high velocities and accelerations in the sagittal and transverse planes. The heavy workload of the task was also evident in elevated physiological responses (HR, RF, VT, VE, VO2, RQ, EE) and perceptual ratings (RPE, Body Discomfort). Assessment of the intervention strategy revealed that the high risk industrial task was reduced to moderate acceptable, with measurements of spinal kinematics, physiological and perceptual variables being significantly reduced. An in situ re-assessment of the workers responses to the intervention also elicited reductions in heart rates and perceptual ratings compared to the original task.
- Full Text:
- Date Issued: 2004
Sexual harassment in employment
- Authors: Ristow, Liezel
- Date: 2004
- Subjects: Sexual harassment -- Law and legislation -- South Africa , Sex discrimination in employment -- Law and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:11062 , http://hdl.handle.net/10948/341 , Sexual harassment -- Law and legislation -- South Africa , Sex discrimination in employment -- Law and legislation -- South Africa
- Description: Africa as no exception. It is generally accepted that women constitute the vast majority of sexual harassment victims. Sexual harassment is therefore one of the major barriers to women’s equality as it is a significant obstacle to women’s entrance into many sectors of the labour market. The Constitution now provides that no person may unfairly discriminate against anyone on grounds of, inter alia, sex and gender. The Employment Equity Act now provides that harassment is a form of unfair discrimination. It has been said that harassment is discriminatory because it raises an arbitrary barrier to the full and equal enjoyment of a person’s rights in the workplace. Much can be learned from the law of the United States and that country’s struggle to fit harassment under its discrimination laws. The Code of Good Practice on the Handling of Sexual Harassment Cases attempts to eliminate sexual harassment in the workplace by providing procedures that will enable employers to deal with occurrences of sexual harassment and to implement preventative measures. The Code also encourages employers to develop and implement policies on sexual harassment that will serve as a guideline for the conduct of all employees. Although the Code has been subject to some criticism, particularly regarding the test for sexual harassment, it remains a valuable guide to both employers and employees alike. The appropriate test for sexual harassment as a form of unfair discrimination has given rise to debate. Both the subjective test and the objective test for sexual harassment present problems. Some authors recommend a compromise between these two tests in the form of the “reasonable victim” test. The Employment Equity Act makes the employer liable for the prohibited acts of the employee in certain circumstances. The Act, however, places certain responsibilities on the employer and the employee-victim before the employer will be held liable for sexual harassment committed by an employee. Sexual harassment committed by an employee constitutes misconduct and can be a dismissible offence. An employer may also be held to have constructively dismissed an employee, if the employer was aware of the sexual harassment and failed to control such behaviour, and the employee is forced to resign. The test for determining the appropriateness of the sanction of dismissal for sexual harassment is whether or not the employee’s misconduct is serious and of such gravity that it makes a continued employment relationship intolerable. However, for such a dismissal to be fair it must be both substantively fair and procedurally fair.
- Full Text:
- Date Issued: 2004
- Authors: Ristow, Liezel
- Date: 2004
- Subjects: Sexual harassment -- Law and legislation -- South Africa , Sex discrimination in employment -- Law and legislation -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:11062 , http://hdl.handle.net/10948/341 , Sexual harassment -- Law and legislation -- South Africa , Sex discrimination in employment -- Law and legislation -- South Africa
- Description: Africa as no exception. It is generally accepted that women constitute the vast majority of sexual harassment victims. Sexual harassment is therefore one of the major barriers to women’s equality as it is a significant obstacle to women’s entrance into many sectors of the labour market. The Constitution now provides that no person may unfairly discriminate against anyone on grounds of, inter alia, sex and gender. The Employment Equity Act now provides that harassment is a form of unfair discrimination. It has been said that harassment is discriminatory because it raises an arbitrary barrier to the full and equal enjoyment of a person’s rights in the workplace. Much can be learned from the law of the United States and that country’s struggle to fit harassment under its discrimination laws. The Code of Good Practice on the Handling of Sexual Harassment Cases attempts to eliminate sexual harassment in the workplace by providing procedures that will enable employers to deal with occurrences of sexual harassment and to implement preventative measures. The Code also encourages employers to develop and implement policies on sexual harassment that will serve as a guideline for the conduct of all employees. Although the Code has been subject to some criticism, particularly regarding the test for sexual harassment, it remains a valuable guide to both employers and employees alike. The appropriate test for sexual harassment as a form of unfair discrimination has given rise to debate. Both the subjective test and the objective test for sexual harassment present problems. Some authors recommend a compromise between these two tests in the form of the “reasonable victim” test. The Employment Equity Act makes the employer liable for the prohibited acts of the employee in certain circumstances. The Act, however, places certain responsibilities on the employer and the employee-victim before the employer will be held liable for sexual harassment committed by an employee. Sexual harassment committed by an employee constitutes misconduct and can be a dismissible offence. An employer may also be held to have constructively dismissed an employee, if the employer was aware of the sexual harassment and failed to control such behaviour, and the employee is forced to resign. The test for determining the appropriateness of the sanction of dismissal for sexual harassment is whether or not the employee’s misconduct is serious and of such gravity that it makes a continued employment relationship intolerable. However, for such a dismissal to be fair it must be both substantively fair and procedurally fair.
- Full Text:
- Date Issued: 2004
SIDVI: a model for secure distributed data integration
- Authors: Routly, Wayne A
- Date: 2004
- Subjects: Data protection
- Language: English
- Type: Thesis , Masters , MTech (Information Technology)
- Identifier: vital:10805 , http://hdl.handle.net/10948/261 , Data protection
- Description: The new millennium has brought about an increase in the use of business intelligence and knowledge management systems. The very foundations of these systems are the multitude of source databases that store the data. The ability to derive information from these databases is brought about by means of data integration. With the current emphasis on security in all walks of information and communication technology, a renewed interest must be placed in the systems that provide us with information; data integration systems. This dissertation investigates security issues at specific stages in the data integration cycle, with special reference to problems when performing data integration in a peer-topeer environment, as in distributed data integration. In the database environment we are concerned with the database itself and the media used to connect to and from the database. In distributed data integration, the concept of the database is redefined to the source database, from which we extract data and the storage database in which the integrated data is stored. This postulates three distinct areas in which to apply security, the data source, the network medium and the data store. All of these areas encompass data integration and must be considered holistically when implementing security. Data integration is never only one server or one database; it is various geographically dispersed components working together towards a common goal. It is important then that we consider all aspects involved when attempting to provide security for data integration. This dissertation will focus on the areas of security threats and investigates a model to ensure the integrity and security of data during the entire integration process. In order to ensure effective security in a data integration environment, that security, should be present at all stages, it should provide for end-to-end protection.
- Full Text:
- Date Issued: 2004
- Authors: Routly, Wayne A
- Date: 2004
- Subjects: Data protection
- Language: English
- Type: Thesis , Masters , MTech (Information Technology)
- Identifier: vital:10805 , http://hdl.handle.net/10948/261 , Data protection
- Description: The new millennium has brought about an increase in the use of business intelligence and knowledge management systems. The very foundations of these systems are the multitude of source databases that store the data. The ability to derive information from these databases is brought about by means of data integration. With the current emphasis on security in all walks of information and communication technology, a renewed interest must be placed in the systems that provide us with information; data integration systems. This dissertation investigates security issues at specific stages in the data integration cycle, with special reference to problems when performing data integration in a peer-topeer environment, as in distributed data integration. In the database environment we are concerned with the database itself and the media used to connect to and from the database. In distributed data integration, the concept of the database is redefined to the source database, from which we extract data and the storage database in which the integrated data is stored. This postulates three distinct areas in which to apply security, the data source, the network medium and the data store. All of these areas encompass data integration and must be considered holistically when implementing security. Data integration is never only one server or one database; it is various geographically dispersed components working together towards a common goal. It is important then that we consider all aspects involved when attempting to provide security for data integration. This dissertation will focus on the areas of security threats and investigates a model to ensure the integrity and security of data during the entire integration process. In order to ensure effective security in a data integration environment, that security, should be present at all stages, it should provide for end-to-end protection.
- Full Text:
- Date Issued: 2004
An evaluation of the implementation of curriculum 2005 in grade 7 in the Motherwell primary schools
- Authors: Rulashe, Brenda Lavisa
- Date: 2004
- Subjects: Education, Primary -- Curricula -- South Africa -- Port Elizabeth , Curriculum planning -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10783 , http://hdl.handle.net/10948/231 , Education, Primary -- Curricula -- South Africa -- Port Elizabeth , Curriculum planning -- South Africa -- Port Elizabeth
- Description: This study focuses on the effective implementation of C2005 by the Grade 7 teachers in the Motherwell area. For teachers to meet the demands of the new curriculum, in-service training is needed to develop them to be competent in all the aspects required for the use of the OBE approach. The main research question is: How have Grade 7 teachers in Motherwell implemented C2005 in their classrooms? Questionnaires and interviews were used as tools to collect the data. The data was collected from five selected primary schools in the Motherwell area. The teachers’ responses obtained from questionnaires and interviews were analyzed both statistically (using tables) and descriptively (telling teachers’ stories). Responses determined the competence of teachers in four areas, namely, teaching methods, content, classroom organization and assessment of learners. An account of inservice training courses attended by teachers is provided. These courses revealed the problems encountered by teachers during the implementation process and the subsequent assisstance they received. The data provided in this study is in line with the research done by the Review Committee (Chisholm, 2000) in the Eastern Cape. Recommendations of the Review Committee gave rise to the establishment of the Revised National Curriculum Statement (RNCS). The responses from this study confirmed the need for retraining of teachers to develop their competences. This study urges the Department of Education to focus on establishing methods of training that will develop teachers in their teaching experience. The SMTs should also be able to assist teachers with the problems they encounter in their schools. Teachers should be able to take responsibility for their learners’ competence and take ownership of changes in their schools. The financial assistance of the National Research Foundation towards this research is hereby acknowledged. Opinions expressed in this thesis and conclusions arrived at, are those of the author and not necessarily to be attributed to the National Research Foundation
- Full Text:
- Date Issued: 2004
- Authors: Rulashe, Brenda Lavisa
- Date: 2004
- Subjects: Education, Primary -- Curricula -- South Africa -- Port Elizabeth , Curriculum planning -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10783 , http://hdl.handle.net/10948/231 , Education, Primary -- Curricula -- South Africa -- Port Elizabeth , Curriculum planning -- South Africa -- Port Elizabeth
- Description: This study focuses on the effective implementation of C2005 by the Grade 7 teachers in the Motherwell area. For teachers to meet the demands of the new curriculum, in-service training is needed to develop them to be competent in all the aspects required for the use of the OBE approach. The main research question is: How have Grade 7 teachers in Motherwell implemented C2005 in their classrooms? Questionnaires and interviews were used as tools to collect the data. The data was collected from five selected primary schools in the Motherwell area. The teachers’ responses obtained from questionnaires and interviews were analyzed both statistically (using tables) and descriptively (telling teachers’ stories). Responses determined the competence of teachers in four areas, namely, teaching methods, content, classroom organization and assessment of learners. An account of inservice training courses attended by teachers is provided. These courses revealed the problems encountered by teachers during the implementation process and the subsequent assisstance they received. The data provided in this study is in line with the research done by the Review Committee (Chisholm, 2000) in the Eastern Cape. Recommendations of the Review Committee gave rise to the establishment of the Revised National Curriculum Statement (RNCS). The responses from this study confirmed the need for retraining of teachers to develop their competences. This study urges the Department of Education to focus on establishing methods of training that will develop teachers in their teaching experience. The SMTs should also be able to assist teachers with the problems they encounter in their schools. Teachers should be able to take responsibility for their learners’ competence and take ownership of changes in their schools. The financial assistance of the National Research Foundation towards this research is hereby acknowledged. Opinions expressed in this thesis and conclusions arrived at, are those of the author and not necessarily to be attributed to the National Research Foundation
- Full Text:
- Date Issued: 2004
The use and performance of recycling polypropylene in lead-acid battery cases
- Authors: Rust, Nico
- Date: 2004
- Subjects: Polypropylene , Lead-acid batteries
- Language: English
- Type: Thesis , Masters , MTech (Chemistry)
- Identifier: vital:10978 , http://hdl.handle.net/10948/269 , Polypropylene , Lead-acid batteries
- Description: Polypropylene has proven to be the ideal material for the outer shell of the lead acid batteries. Due to its mold-ability and inert properties the material provides a capsule for the functioning components of the lead acid battery and can withstand a variety conditions encountered during its application, such as impact shock resistance, high and low temperatures and acid resistance. Polypropylene has however become of great concern with regards to environmental pollution since it is generally resistant to normal conditions of degradation and can only be properly disposed of by incineration. This factor has encouraged the industry to find ways to regenerate spent polypropylene. A good example of such a process is the recycling of lead acid batteries. This allows not only for the regeneration of lead, but also for the recycling of polypropylene in the manufacturing of battery cases. There are some cost advantages in using recycled polypropylene. However it does have its disadvantages in that the material does start to deteriorate after multiple processes. A common practice amongst battery manufacturers is to add virgin polypropylene to the recycled material in order to ensure performance consistency. The comparative study investigated the use of various ratios of virgin and recycled PP in the manufacturing of lead acid battery cases and their influence on the physical properties and performance of the final material. The degradation of PP was also investigated as the material was subjected to multiple manufacturing processes where the influence of stabilizers was further considered. A common technique of PP analysis such as MFI was shown to be an effective technique to maintain good quality control. The study further showed that it is important that the material grade of PP used in the manufacturing of the battery case and lid is compatible in order to allow for effective heating sealing of the two components. Polypropylene has a waxy surface finish and it is generally difficult to label or write on. Labels tend to fall off in application and make it difficult to maintain a track record of the manufactured batteries with time. This study showed successfully that a laser activated dye can be added to the PP without influencing its color or its performance. This allows for successful labeling of battery cases by various bar coding writers that can trace the battery through its manufacturing process. Lead acid batteries are often operated outside the specified temperature range that is determined by battery manufacturers resulting in premature failure. These failures can occur within the warranty period of the battery and result in illicit claims since the monitoring of the batteries in its application was not possible. A suitable temperature monitoring device was designed that would be incorporated into the vent cap or lid of the battery case. The device contained temperature sensitive indicators that would undergo a permanent color change at specified temperatures thereby giving the battery manufacturer an indication as to the maximum temperature the battery was exposed to.
- Full Text:
- Date Issued: 2004
- Authors: Rust, Nico
- Date: 2004
- Subjects: Polypropylene , Lead-acid batteries
- Language: English
- Type: Thesis , Masters , MTech (Chemistry)
- Identifier: vital:10978 , http://hdl.handle.net/10948/269 , Polypropylene , Lead-acid batteries
- Description: Polypropylene has proven to be the ideal material for the outer shell of the lead acid batteries. Due to its mold-ability and inert properties the material provides a capsule for the functioning components of the lead acid battery and can withstand a variety conditions encountered during its application, such as impact shock resistance, high and low temperatures and acid resistance. Polypropylene has however become of great concern with regards to environmental pollution since it is generally resistant to normal conditions of degradation and can only be properly disposed of by incineration. This factor has encouraged the industry to find ways to regenerate spent polypropylene. A good example of such a process is the recycling of lead acid batteries. This allows not only for the regeneration of lead, but also for the recycling of polypropylene in the manufacturing of battery cases. There are some cost advantages in using recycled polypropylene. However it does have its disadvantages in that the material does start to deteriorate after multiple processes. A common practice amongst battery manufacturers is to add virgin polypropylene to the recycled material in order to ensure performance consistency. The comparative study investigated the use of various ratios of virgin and recycled PP in the manufacturing of lead acid battery cases and their influence on the physical properties and performance of the final material. The degradation of PP was also investigated as the material was subjected to multiple manufacturing processes where the influence of stabilizers was further considered. A common technique of PP analysis such as MFI was shown to be an effective technique to maintain good quality control. The study further showed that it is important that the material grade of PP used in the manufacturing of the battery case and lid is compatible in order to allow for effective heating sealing of the two components. Polypropylene has a waxy surface finish and it is generally difficult to label or write on. Labels tend to fall off in application and make it difficult to maintain a track record of the manufactured batteries with time. This study showed successfully that a laser activated dye can be added to the PP without influencing its color or its performance. This allows for successful labeling of battery cases by various bar coding writers that can trace the battery through its manufacturing process. Lead acid batteries are often operated outside the specified temperature range that is determined by battery manufacturers resulting in premature failure. These failures can occur within the warranty period of the battery and result in illicit claims since the monitoring of the batteries in its application was not possible. A suitable temperature monitoring device was designed that would be incorporated into the vent cap or lid of the battery case. The device contained temperature sensitive indicators that would undergo a permanent color change at specified temperatures thereby giving the battery manufacturer an indication as to the maximum temperature the battery was exposed to.
- Full Text:
- Date Issued: 2004
The performance of hearing impaired children on the Revised Extended Griffiths Scales
- Authors: Schröder, Ingrid Anita
- Date: 2004
- Subjects: Psychological tests for children -- South Africa , Griffiths Developmental Scales , Deaf children -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:11031 , http://hdl.handle.net/10948/333 , Psychological tests for children -- South Africa , Griffiths Developmental Scales , Deaf children -- South Africa
- Description: In this unique time of nation building in South Africa, education is seen as the key foundation stone to prosperity and development. However, despite a decade of restructuring, many differing groups of children still do not receive the quality of education they deserve. Amongst those are children with special needs, including those who have a hearing impairment. These children are the focus of the present study. It is a widely accepted principle that early assessment and intervention is necessary to maximise a child’s potential. It is for this reason that the global aim of this study was to explore and describe the developmental profile of hearing impaired children on the Revised Extended Griffiths Scales. Further aims were to compare the performance of the clinical sample to a normal South African sample. A quantitative, exploratory-descriptive research design was employed. The sample of hearing impaired children (N = 58), between the ages of 36 and 95 months, attended the Carel du Toit Pre-School in the Western Cape, South Africa and were obtained by means of a non-probability, purposive sampling procedure. The normal sample (N = 58) was drawn from an existing database created for the revision of the Scales. Information was collated using clinical files, biographical data as well as the results of an assessment on the Revised Extended Griffiths Scales. The major findings of the study are summarised below. The general performance of the hearing impaired sample on the Revised Extended Griffiths Scales was average. The performance of the children on the six subscales ranged from below average to average, with major fall-outs occurring on the Hearing and Speech and Practical Reasoning Subscales. The normal sample performed significantly better than the hearing impaired sample on all of the subscales of the measure. However, significant differences were found on four of the six subscales, namely, the Locomotor, Personal-Social, Hearing and Speech and Practical Reasoning Subscales. Generally, the results of the current study suggest that a specific developmental profile is obtained for hearing impaired children. In addition, this study has highlighted the success with which the Revised Extended Griffiths Scales can be utilised on a hearing impaired population.
- Full Text:
- Date Issued: 2004
- Authors: Schröder, Ingrid Anita
- Date: 2004
- Subjects: Psychological tests for children -- South Africa , Griffiths Developmental Scales , Deaf children -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:11031 , http://hdl.handle.net/10948/333 , Psychological tests for children -- South Africa , Griffiths Developmental Scales , Deaf children -- South Africa
- Description: In this unique time of nation building in South Africa, education is seen as the key foundation stone to prosperity and development. However, despite a decade of restructuring, many differing groups of children still do not receive the quality of education they deserve. Amongst those are children with special needs, including those who have a hearing impairment. These children are the focus of the present study. It is a widely accepted principle that early assessment and intervention is necessary to maximise a child’s potential. It is for this reason that the global aim of this study was to explore and describe the developmental profile of hearing impaired children on the Revised Extended Griffiths Scales. Further aims were to compare the performance of the clinical sample to a normal South African sample. A quantitative, exploratory-descriptive research design was employed. The sample of hearing impaired children (N = 58), between the ages of 36 and 95 months, attended the Carel du Toit Pre-School in the Western Cape, South Africa and were obtained by means of a non-probability, purposive sampling procedure. The normal sample (N = 58) was drawn from an existing database created for the revision of the Scales. Information was collated using clinical files, biographical data as well as the results of an assessment on the Revised Extended Griffiths Scales. The major findings of the study are summarised below. The general performance of the hearing impaired sample on the Revised Extended Griffiths Scales was average. The performance of the children on the six subscales ranged from below average to average, with major fall-outs occurring on the Hearing and Speech and Practical Reasoning Subscales. The normal sample performed significantly better than the hearing impaired sample on all of the subscales of the measure. However, significant differences were found on four of the six subscales, namely, the Locomotor, Personal-Social, Hearing and Speech and Practical Reasoning Subscales. Generally, the results of the current study suggest that a specific developmental profile is obtained for hearing impaired children. In addition, this study has highlighted the success with which the Revised Extended Griffiths Scales can be utilised on a hearing impaired population.
- Full Text:
- Date Issued: 2004
The influence of an adapted knee angle, as determined by isokinetic assessment, on sprint starting performance
- Authors: Schultz, Adrian Brent
- Date: 2004
- Subjects: Sprinting -- South Africa -- Physiological aspects -- Testing , Muscle strength -- Testing , Runners (Sports) -- South Africa -- Testing
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:11029 , http://hdl.handle.net/10948/317 , Sprinting -- South Africa -- Physiological aspects -- Testing , Muscle strength -- Testing , Runners (Sports) -- South Africa -- Testing
- Description: Muscle strength has been identified as an important contributor to athletic performance. Little attention however, has been paid to the specific relationship between peak isokinetic muscle strength and sprint starting performance. The aim of this study was to determine the influence of an adapted front knee angle, as determined by isokinetic assessment (the angle of peak torque production), on starting performance. Sixteen track sprinters, of elite-national or competitive-regional standard, were asked to perform eight sprints over 50m using four separate starting techniques. Technique 1 featured the athlete’s usual starting preferences while Techniques 2, 3 and 4 featured a standardised set of starting preferences with experimental modifications of the front knee angle in the “set” position. Isokinetic muscle strength was measured at slow (60°/s) and fast (240°/s) test speeds in order to determine the angle of peak torque production for concentric knee extension of each subject’s lead leg. Using one-way analysis of variance (ANOVA) and Post Hoc analysis (LSD), no significant differences (p>0.05) were observed between the experimental techniques for: block time, force-time measures during block time, sprint times, sprint velocity and acceleratio n measures at intervals up to 50m. Significant differences (p<0.05) were however observed between reaction times for the experimental techniques. Slower reaction times are most likely due to increased upper body pretension, resulting from the increased hip elevation seen for these techniques. The results indicate that increased hip elevation may have delayed the initiation of the relevant motor response required to affect an optimal sprint start. Technique 1 resulted in the shortest reaction times, shortest block times, fastest sprint times and greatest sprint velocities for all four techniques. This result was possibly due to the athlete’s experience with, and repeated use of, this technique. The experimental techniques therefore provided no added advantage over the subject’s preferred starting technique and did not significantly optimise sprint starting performance. The results show that modification of the front knee angle had no significant influence on sprint starting performance and sprint running ve locity or acceleration patterns up to 50m. Using Pearson’s Correlation Coefficient to determine the strongest correlations between isokinetic knee strength and sprint starting performance, analysis revealed that the strongest relationships were found between sprint starting performance expressed as acceleration and isokinetic knee strength expressed as relative peak torque and absolute peak torque. For Technique 1 the strongest correlation was found between acceleration (30m - 40m) and relative peak torque as measured at a test speed of 240°/s (r = 0.62). For the remaining experimental techniques, the strongest correlation was found between acceleration (10m - 20m) and relative peak torque as measured at a test speed of 60°/s (r = 0.53) for Technique 2, between acceleration (40m - 50m) and peak torque measured at a test speed of 60°/s (r = 0.72) for Technique 3, and between acceleration (0m - 5m) and peak torque as measured at a test speed of 240°/s (r = 0.71) for Technique 4. These results suggest that isokinetic muscle strength does not correlate strongly with sprint starting performance and that additional factors, such as neuromuscular organisation and muscle fibre typing, possibly make a greater contribution to optimal sprint starting performance.
- Full Text:
- Date Issued: 2004
- Authors: Schultz, Adrian Brent
- Date: 2004
- Subjects: Sprinting -- South Africa -- Physiological aspects -- Testing , Muscle strength -- Testing , Runners (Sports) -- South Africa -- Testing
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:11029 , http://hdl.handle.net/10948/317 , Sprinting -- South Africa -- Physiological aspects -- Testing , Muscle strength -- Testing , Runners (Sports) -- South Africa -- Testing
- Description: Muscle strength has been identified as an important contributor to athletic performance. Little attention however, has been paid to the specific relationship between peak isokinetic muscle strength and sprint starting performance. The aim of this study was to determine the influence of an adapted front knee angle, as determined by isokinetic assessment (the angle of peak torque production), on starting performance. Sixteen track sprinters, of elite-national or competitive-regional standard, were asked to perform eight sprints over 50m using four separate starting techniques. Technique 1 featured the athlete’s usual starting preferences while Techniques 2, 3 and 4 featured a standardised set of starting preferences with experimental modifications of the front knee angle in the “set” position. Isokinetic muscle strength was measured at slow (60°/s) and fast (240°/s) test speeds in order to determine the angle of peak torque production for concentric knee extension of each subject’s lead leg. Using one-way analysis of variance (ANOVA) and Post Hoc analysis (LSD), no significant differences (p>0.05) were observed between the experimental techniques for: block time, force-time measures during block time, sprint times, sprint velocity and acceleratio n measures at intervals up to 50m. Significant differences (p<0.05) were however observed between reaction times for the experimental techniques. Slower reaction times are most likely due to increased upper body pretension, resulting from the increased hip elevation seen for these techniques. The results indicate that increased hip elevation may have delayed the initiation of the relevant motor response required to affect an optimal sprint start. Technique 1 resulted in the shortest reaction times, shortest block times, fastest sprint times and greatest sprint velocities for all four techniques. This result was possibly due to the athlete’s experience with, and repeated use of, this technique. The experimental techniques therefore provided no added advantage over the subject’s preferred starting technique and did not significantly optimise sprint starting performance. The results show that modification of the front knee angle had no significant influence on sprint starting performance and sprint running ve locity or acceleration patterns up to 50m. Using Pearson’s Correlation Coefficient to determine the strongest correlations between isokinetic knee strength and sprint starting performance, analysis revealed that the strongest relationships were found between sprint starting performance expressed as acceleration and isokinetic knee strength expressed as relative peak torque and absolute peak torque. For Technique 1 the strongest correlation was found between acceleration (30m - 40m) and relative peak torque as measured at a test speed of 240°/s (r = 0.62). For the remaining experimental techniques, the strongest correlation was found between acceleration (10m - 20m) and relative peak torque as measured at a test speed of 60°/s (r = 0.53) for Technique 2, between acceleration (40m - 50m) and peak torque measured at a test speed of 60°/s (r = 0.72) for Technique 3, and between acceleration (0m - 5m) and peak torque as measured at a test speed of 240°/s (r = 0.71) for Technique 4. These results suggest that isokinetic muscle strength does not correlate strongly with sprint starting performance and that additional factors, such as neuromuscular organisation and muscle fibre typing, possibly make a greater contribution to optimal sprint starting performance.
- Full Text:
- Date Issued: 2004
Burial practices, African women, and Islam in the Eastern Cape province, South Africa
- Authors: Sesanti, Simphiwe Olicius
- Date: 2004
- Subjects: Islamic funeral rites and ceremonies -- South Africa -- Eastern Cape , Muslim women -- South Africa -- Eastern Cape , Mourning custom -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10998 , http://hdl.handle.net/10948/346 , Islamic funeral rites and ceremonies -- South Africa -- Eastern Cape , Muslim women -- South Africa -- Eastern Cape , Mourning custom -- South Africa -- Eastern Cape
- Description: Early in 2003, African Muslims in Uitenhage’s township, Kwa-Nobuhle, learnt that Muslim women, led by Sheikh Nceba Salamntu, in South Africa’s Port Elizabeth New Brighton township, were allowed, contrary to previous practice, to follow a funeral procession right up to the graveyard. The resultant discomfort on the one hand, and excitement on the other caused by this event among Muslims in the township, forms the basis of this research. It gives focus to Muslim women, the ones most affected by their customary restriction from the gravesites. The researchi exposes the basis for women’s exclusion from funeral processions in the Muslim community. It was established that many of these Muslim women who challenged the practice were converts from Christianity to Islam. One of the bases for their action was that they were passive recipients of Islam. Furthermore, it was found that the exclusion of women from the funeral procession has no basis in Islamic writings.
- Full Text:
- Date Issued: 2004
- Authors: Sesanti, Simphiwe Olicius
- Date: 2004
- Subjects: Islamic funeral rites and ceremonies -- South Africa -- Eastern Cape , Muslim women -- South Africa -- Eastern Cape , Mourning custom -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10998 , http://hdl.handle.net/10948/346 , Islamic funeral rites and ceremonies -- South Africa -- Eastern Cape , Muslim women -- South Africa -- Eastern Cape , Mourning custom -- South Africa -- Eastern Cape
- Description: Early in 2003, African Muslims in Uitenhage’s township, Kwa-Nobuhle, learnt that Muslim women, led by Sheikh Nceba Salamntu, in South Africa’s Port Elizabeth New Brighton township, were allowed, contrary to previous practice, to follow a funeral procession right up to the graveyard. The resultant discomfort on the one hand, and excitement on the other caused by this event among Muslims in the township, forms the basis of this research. It gives focus to Muslim women, the ones most affected by their customary restriction from the gravesites. The researchi exposes the basis for women’s exclusion from funeral processions in the Muslim community. It was established that many of these Muslim women who challenged the practice were converts from Christianity to Islam. One of the bases for their action was that they were passive recipients of Islam. Furthermore, it was found that the exclusion of women from the funeral procession has no basis in Islamic writings.
- Full Text:
- Date Issued: 2004
The development of a geographic information system (GIS) as a mariculture sector planning tool in South Africa
- Authors: Shiran-Klotz, Imran
- Date: 2004
- Subjects: Geographic information systems -- South Africa , Fishery management -- Geographic information systems -- South Africa , Mariculture -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5337 , http://hdl.handle.net/10962/d1005870 , Geographic information systems -- South Africa , Fishery management -- Geographic information systems -- South Africa , Mariculture -- South Africa
- Description: The South African coastline has a high potential for mariculture development, particularly in land-based systems, due to excellent water quality, good infrastructure, and relatively cheap land in certain areas. Development of mariculture however, has been slow primarily due to the absence of a national sector development plan to coordinate contribution to development by government, industry and academia. Recent mariculture development plans however, supported by government commitment to stimulate coastal development, offers new opportunity for the sector's growth. These new sector development plans require a multi-disciplinary intensive information base with a strong regional and national spatial component. Geographic Information System (GIS) is a spatial analytical tool, which is capable of handling such large coastal databases and analysing them. Nevertheless, many mariculture GIS planning applications, often developed in isolation and with limited practical use for decision makers, highlighted the need to develop GIS in relation to the mariculture sector development plan. Hence, the aim of this study was to develop and evaluate a GIS for the national and regional mariculture sector planning process in South Africa, in order to identify potentially suitable areas along the South African coastline for mariculture operations. The GIS development in this study was based on the mariculture planning approach developed by PAP/RAe (1996), which recognizes the variations of scales in mariculture planning. Three case studies, representing the diversity of the South African sector plan, were selected to develop the GIS. They included: a national suitability analysis for all land-based culture systems, a specific national analysis on abalone ranching, and a detailed regional analysis of land-based culture and abalone ranching along the Namaqualand coastline. The GIS was developed separately for each case study based on a strategy consisting of six main phases, including: identification of project requirements, developing analytical framework, selection and location of data sources, organization and manipulation of data, analysing data and verifying and evaluation of the outputs. Biophysical, coastal use, and infrastructure criteria were collected, sorted and analysed to identify development constraints. Based on a set of conditions, and Boolean logic and arithmetic operations, unsuitable areas were identified and eliminated. Main constraints for national land-based development included competition over space along KwaZuluNatal Province coastline and restricted access to the coast along the south region of the Northern Cape Province, Wild Coast along the Eastern Cape Province, and Maputaland along KwaZulu-Natal Province. Ten areas along the country coastline were therefore identified as potentially suitable for land-based mariculture. Furthermore, South African abalone ranching potential was found to be limited mostly along the Western and Northern Cape Province's coastline due to the high risk of Paralytic Shellfish Poison (PSP) occurrences, alternative resource use and activities such as commercial fishery, poaching, and conservation. Hence, a total of nine areas along the Northern Cape, Western Cape, and Eastern Cape coastlines were identified as premier areas for abalone ranching. The regional study along the Namaqualand coastline revealed potential conflict between mining activity and mariculture development due to security issues and restricted access to the coast. Land-based mariculture development was confined to the four main coastal urban areas. The highest potential for land-based mariculture was along Port Nolloth and Kleinsee coastlines, whereas marine-based (i.e. abalone ranching) potential was poor along the north part of the coast due to intense marine mining activities, restricted access to the coast, and low kelp bed density. High potential abalone ranching areas were identified south to Kleinsee, and around Port Nolloth. Potential conflict with marine mining activity was minimal since it was localised and not related to kelp bed locations. It was concluded that GIS is a relevant and compatible tool for South African mariculture sector planning. However, future development of GIS as integrated planning tool in mariculture and coastal planning, requires updated spatial data (e.g. recreational activity), and continued interaction among project planners, mariculture specialists and GIS analysts.
- Full Text:
- Date Issued: 2004
- Authors: Shiran-Klotz, Imran
- Date: 2004
- Subjects: Geographic information systems -- South Africa , Fishery management -- Geographic information systems -- South Africa , Mariculture -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5337 , http://hdl.handle.net/10962/d1005870 , Geographic information systems -- South Africa , Fishery management -- Geographic information systems -- South Africa , Mariculture -- South Africa
- Description: The South African coastline has a high potential for mariculture development, particularly in land-based systems, due to excellent water quality, good infrastructure, and relatively cheap land in certain areas. Development of mariculture however, has been slow primarily due to the absence of a national sector development plan to coordinate contribution to development by government, industry and academia. Recent mariculture development plans however, supported by government commitment to stimulate coastal development, offers new opportunity for the sector's growth. These new sector development plans require a multi-disciplinary intensive information base with a strong regional and national spatial component. Geographic Information System (GIS) is a spatial analytical tool, which is capable of handling such large coastal databases and analysing them. Nevertheless, many mariculture GIS planning applications, often developed in isolation and with limited practical use for decision makers, highlighted the need to develop GIS in relation to the mariculture sector development plan. Hence, the aim of this study was to develop and evaluate a GIS for the national and regional mariculture sector planning process in South Africa, in order to identify potentially suitable areas along the South African coastline for mariculture operations. The GIS development in this study was based on the mariculture planning approach developed by PAP/RAe (1996), which recognizes the variations of scales in mariculture planning. Three case studies, representing the diversity of the South African sector plan, were selected to develop the GIS. They included: a national suitability analysis for all land-based culture systems, a specific national analysis on abalone ranching, and a detailed regional analysis of land-based culture and abalone ranching along the Namaqualand coastline. The GIS was developed separately for each case study based on a strategy consisting of six main phases, including: identification of project requirements, developing analytical framework, selection and location of data sources, organization and manipulation of data, analysing data and verifying and evaluation of the outputs. Biophysical, coastal use, and infrastructure criteria were collected, sorted and analysed to identify development constraints. Based on a set of conditions, and Boolean logic and arithmetic operations, unsuitable areas were identified and eliminated. Main constraints for national land-based development included competition over space along KwaZuluNatal Province coastline and restricted access to the coast along the south region of the Northern Cape Province, Wild Coast along the Eastern Cape Province, and Maputaland along KwaZulu-Natal Province. Ten areas along the country coastline were therefore identified as potentially suitable for land-based mariculture. Furthermore, South African abalone ranching potential was found to be limited mostly along the Western and Northern Cape Province's coastline due to the high risk of Paralytic Shellfish Poison (PSP) occurrences, alternative resource use and activities such as commercial fishery, poaching, and conservation. Hence, a total of nine areas along the Northern Cape, Western Cape, and Eastern Cape coastlines were identified as premier areas for abalone ranching. The regional study along the Namaqualand coastline revealed potential conflict between mining activity and mariculture development due to security issues and restricted access to the coast. Land-based mariculture development was confined to the four main coastal urban areas. The highest potential for land-based mariculture was along Port Nolloth and Kleinsee coastlines, whereas marine-based (i.e. abalone ranching) potential was poor along the north part of the coast due to intense marine mining activities, restricted access to the coast, and low kelp bed density. High potential abalone ranching areas were identified south to Kleinsee, and around Port Nolloth. Potential conflict with marine mining activity was minimal since it was localised and not related to kelp bed locations. It was concluded that GIS is a relevant and compatible tool for South African mariculture sector planning. However, future development of GIS as integrated planning tool in mariculture and coastal planning, requires updated spatial data (e.g. recreational activity), and continued interaction among project planners, mariculture specialists and GIS analysts.
- Full Text:
- Date Issued: 2004
Multiprotocol control of networked home entertainment devices
- Authors: Siebörger, David Robert
- Date: 2004
- Subjects: Home entertainment systems , Home video systems
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4642 , http://hdl.handle.net/10962/d1006585 , Home entertainment systems , Home video systems
- Description: Networks will soon connect a wide range of computing devices within the home. Amongst those devices will be home entertainment devices. Remote control over the network will be a key application for networked entertainment devices, and requires a protocol for communication understood by both controller and controlled device. Devices capable of communication using multiple control protocols will be compatible with a wider range of controllers than those which implement only one control protocol. This work examines home networks and a number of control protocols. The implementations of the UPnP and AV/C protocols for an AV receiver are described. The issues involved in the concurrent use of multiple control protocols to control a device are considered, possible methods of concurrent control discussed, and a solution which simulates virtual copies of the device is implemented and tested.
- Full Text:
- Date Issued: 2004
- Authors: Siebörger, David Robert
- Date: 2004
- Subjects: Home entertainment systems , Home video systems
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4642 , http://hdl.handle.net/10962/d1006585 , Home entertainment systems , Home video systems
- Description: Networks will soon connect a wide range of computing devices within the home. Amongst those devices will be home entertainment devices. Remote control over the network will be a key application for networked entertainment devices, and requires a protocol for communication understood by both controller and controlled device. Devices capable of communication using multiple control protocols will be compatible with a wider range of controllers than those which implement only one control protocol. This work examines home networks and a number of control protocols. The implementations of the UPnP and AV/C protocols for an AV receiver are described. The issues involved in the concurrent use of multiple control protocols to control a device are considered, possible methods of concurrent control discussed, and a solution which simulates virtual copies of the device is implemented and tested.
- Full Text:
- Date Issued: 2004
Gold exploration northeast of Ngundu Halt, northern marginal zone of the Limpopo Belt, Zimbabwe
- Authors: Simango, Robert Zulu
- Date: 2004 , 2013-05-30
- Subjects: Geology -- Zimbabwe , Gold ores -- Geology -- Zimbabwe , Greenstone belts -- Zimbabwe , Gold mines and mining -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5007 , http://hdl.handle.net/10962/d1005844 , Geology -- Zimbabwe , Gold ores -- Geology -- Zimbabwe , Greenstone belts -- Zimbabwe , Gold mines and mining -- Zimbabwe
- Description: Gold exploration was conducted in northern margin, granulite-facies rocks of the Limpopo Belt. Methods used in the prospecting include drainage, soil and rock geochemistry, geophysical surveys, geological mapping, trenching and diamond drilling. These techniques successfully led to the discovery of two medium size, mesothermal gold deposits (Grid 2s and Grid 4). Objectives of this study were to (a) document the exploration methodology used; (b) describe the regional geology; (c) establish a mineral deposit model; (d) outline the methods and results of various exploration techniques; (e) outline follow-up procedures and evaluation of anomalies; and (f) discuss results of the exploration exercise and conclusions. The granulite-facies terrain comprises Charno-enderbites, mafic and felsic to intermediate metavolcanic rocks and meta-sediments. Renco Mine situated immediately east of the study area, was selected as the ore deposit model for the exploration program. Gold mineralization occurs in shear and thrust zones within an enderbite. The gold deposits are structurally controlled by a first-order, Sinistral transcrustal Mauch Shear Zone, which is parallel to a regional east-northeast penetrative foliation. The deposits are in dilation zones where the Mauch Shear (a) is intersected by a dextral east-west shear (Grid 2s), or (b) has a sinistral splay (Grid 4 and Renco). Close to these deposits, the Mauch Shear is in contact with a "greenstone belt", which is a possible source of crustal metamorphic ore fluids and gold. The Grid 2s deposit contains fine-grained, disseminated free gold, and small amounts of pyrrhotite, pyrite and chalcopyrite in quartz veins within third-order shears in K-feldspar granite. K-feldspar, sericitic, silicic, sulphidation and carbonate alteration characterizes the deposit, which has a proposed mantle-degassing model. The Grid 4 deposit is magmatic porphyry-type, with CuMo and Au in third- and fourth-order shears respectively. Mineralization comprises disseminated to semi-massive pyrrhotite, pyrite, chalcopyrite, sphalerite, bismuth, molybdenite and gold. Wall rock alteration includes biotitic, chloritic, silicic, sulphidation and carbonate. In Grid 2s, Grid 4 and Renco deposits, the alteration mineral assemblages are in three facies, which are granulite, amphibolte and greenschist. In the three deposits, the mineralization occurs with the amphibolite-facies, indicating post-peak, retrograde metamorphic conditions. , Illustrations (maps) only available in print form at Cory Library , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2004
- Authors: Simango, Robert Zulu
- Date: 2004 , 2013-05-30
- Subjects: Geology -- Zimbabwe , Gold ores -- Geology -- Zimbabwe , Greenstone belts -- Zimbabwe , Gold mines and mining -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5007 , http://hdl.handle.net/10962/d1005844 , Geology -- Zimbabwe , Gold ores -- Geology -- Zimbabwe , Greenstone belts -- Zimbabwe , Gold mines and mining -- Zimbabwe
- Description: Gold exploration was conducted in northern margin, granulite-facies rocks of the Limpopo Belt. Methods used in the prospecting include drainage, soil and rock geochemistry, geophysical surveys, geological mapping, trenching and diamond drilling. These techniques successfully led to the discovery of two medium size, mesothermal gold deposits (Grid 2s and Grid 4). Objectives of this study were to (a) document the exploration methodology used; (b) describe the regional geology; (c) establish a mineral deposit model; (d) outline the methods and results of various exploration techniques; (e) outline follow-up procedures and evaluation of anomalies; and (f) discuss results of the exploration exercise and conclusions. The granulite-facies terrain comprises Charno-enderbites, mafic and felsic to intermediate metavolcanic rocks and meta-sediments. Renco Mine situated immediately east of the study area, was selected as the ore deposit model for the exploration program. Gold mineralization occurs in shear and thrust zones within an enderbite. The gold deposits are structurally controlled by a first-order, Sinistral transcrustal Mauch Shear Zone, which is parallel to a regional east-northeast penetrative foliation. The deposits are in dilation zones where the Mauch Shear (a) is intersected by a dextral east-west shear (Grid 2s), or (b) has a sinistral splay (Grid 4 and Renco). Close to these deposits, the Mauch Shear is in contact with a "greenstone belt", which is a possible source of crustal metamorphic ore fluids and gold. The Grid 2s deposit contains fine-grained, disseminated free gold, and small amounts of pyrrhotite, pyrite and chalcopyrite in quartz veins within third-order shears in K-feldspar granite. K-feldspar, sericitic, silicic, sulphidation and carbonate alteration characterizes the deposit, which has a proposed mantle-degassing model. The Grid 4 deposit is magmatic porphyry-type, with CuMo and Au in third- and fourth-order shears respectively. Mineralization comprises disseminated to semi-massive pyrrhotite, pyrite, chalcopyrite, sphalerite, bismuth, molybdenite and gold. Wall rock alteration includes biotitic, chloritic, silicic, sulphidation and carbonate. In Grid 2s, Grid 4 and Renco deposits, the alteration mineral assemblages are in three facies, which are granulite, amphibolte and greenschist. In the three deposits, the mineralization occurs with the amphibolite-facies, indicating post-peak, retrograde metamorphic conditions. , Illustrations (maps) only available in print form at Cory Library , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2004
Investigation of the larval parasitoids of the false codling moth, Cryptophlebia Leucotreta (Meyrick) (Lepidoptera: Tortricidae), on citrus in South Africa
- Authors: Sishuba, Nomahlubi
- Date: 2004
- Subjects: Cryptophlebia leucotreta , Tortricidae , Cryptophlebia leucotreta -- Control , Pests -- Biological control , Parasitoids , Citrus -- Diseases and pests
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5918 , http://hdl.handle.net/10962/d1016267
- Description: The study examined the larval parasitoids of Cryptophlebia leucotreta (Meyrick) on citrus in South Africa and aimed to improve the existing rearing techniques of C. leucotreta with a view to mass rearing of biological control agents. The biological characteristics of Agathis bishopi Nixon (Hymenoptera: Braconidae) were studied, with an emphasis on parasitism rates in the field, host stage preference, developmental rate, life span and offspring sex ratios. Two larval parasitoids, A. bishopi and Apophua leucotretae (Wilkinson) (Hymenoptera: Ichneumonidae), and an egg parasitoid, Trichogrammatoidea cryptophlebiae Nagaraja (Hymenoptera: Trichogrammatidae), were recorded on C. leucotreta on citrus. A. bishopi was the more abundant of the larval parasitoids and exhibited density dependent parasitism. The highest parasitism rates were observed in December with up to 38% in Sundays River Valley and 34% in Gamtoos River Valley, at a time when the highest false codling moth infestations were observed. Agathis bishopi was recorded only in the Eastern Cape Province. The sex ratio of A. bishopi was biased towards females throughout the study (77% in Gamtoos River Valley and 72% in Sundays River Valley). Agathis bishopi is a solitary, koinobiont, larval-pupal endoparasitoid. The species showed a preference for 1st and 2"d instar hosts. Females regulate the sex of their progeny according to the size and larval stage of the host, ovipositing unfertilised eggs in younger, smaller larvae (1st instars) and fertilised eggs in older, larger larvae (2nd instars). The developmental rate of A. bishopi is in synchrony with that of the moth and adults emerge when adult moths that have escaped parasitism emerge. Agathis bishopi and T. cryptophlebiae compliment each other because they have different niches and strategies of attack. Integrating A. bishopi and T. cryptophlebiae into the management of citrus orchards has potential to suppress false codling moth. Larger rearing containers seemed ideal for large-scale rearing of false codling moth. A higher percentage of adults was obtained from larvae reared in larger containers than in smaller ones. The width of the sponges used as stoppers prevented escape of the larvae. Media prepared in larger containers are easier and simpler to prepare than in smaller ones, thus eliminating many precautions otherwise necessary to prevent contamination. Moth production was greatly reduced by the high concentration of Sporekill used for egg decontamination.
- Full Text:
- Date Issued: 2004
- Authors: Sishuba, Nomahlubi
- Date: 2004
- Subjects: Cryptophlebia leucotreta , Tortricidae , Cryptophlebia leucotreta -- Control , Pests -- Biological control , Parasitoids , Citrus -- Diseases and pests
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5918 , http://hdl.handle.net/10962/d1016267
- Description: The study examined the larval parasitoids of Cryptophlebia leucotreta (Meyrick) on citrus in South Africa and aimed to improve the existing rearing techniques of C. leucotreta with a view to mass rearing of biological control agents. The biological characteristics of Agathis bishopi Nixon (Hymenoptera: Braconidae) were studied, with an emphasis on parasitism rates in the field, host stage preference, developmental rate, life span and offspring sex ratios. Two larval parasitoids, A. bishopi and Apophua leucotretae (Wilkinson) (Hymenoptera: Ichneumonidae), and an egg parasitoid, Trichogrammatoidea cryptophlebiae Nagaraja (Hymenoptera: Trichogrammatidae), were recorded on C. leucotreta on citrus. A. bishopi was the more abundant of the larval parasitoids and exhibited density dependent parasitism. The highest parasitism rates were observed in December with up to 38% in Sundays River Valley and 34% in Gamtoos River Valley, at a time when the highest false codling moth infestations were observed. Agathis bishopi was recorded only in the Eastern Cape Province. The sex ratio of A. bishopi was biased towards females throughout the study (77% in Gamtoos River Valley and 72% in Sundays River Valley). Agathis bishopi is a solitary, koinobiont, larval-pupal endoparasitoid. The species showed a preference for 1st and 2"d instar hosts. Females regulate the sex of their progeny according to the size and larval stage of the host, ovipositing unfertilised eggs in younger, smaller larvae (1st instars) and fertilised eggs in older, larger larvae (2nd instars). The developmental rate of A. bishopi is in synchrony with that of the moth and adults emerge when adult moths that have escaped parasitism emerge. Agathis bishopi and T. cryptophlebiae compliment each other because they have different niches and strategies of attack. Integrating A. bishopi and T. cryptophlebiae into the management of citrus orchards has potential to suppress false codling moth. Larger rearing containers seemed ideal for large-scale rearing of false codling moth. A higher percentage of adults was obtained from larvae reared in larger containers than in smaller ones. The width of the sponges used as stoppers prevented escape of the larvae. Media prepared in larger containers are easier and simpler to prepare than in smaller ones, thus eliminating many precautions otherwise necessary to prevent contamination. Moth production was greatly reduced by the high concentration of Sporekill used for egg decontamination.
- Full Text:
- Date Issued: 2004
The viability of small-scale farming at the Tyhefu Irrigation Scheme, Eastern Cape
- Authors: Sishuta, Happy Babalwa
- Date: 2004
- Subjects: Farms, Small -- South Africa -- Eastern Cape , Irrigation -- South Africa -- Eastern Cape , Irrigation farming -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3344 , http://hdl.handle.net/10962/d1004924 , Farms, Small -- South Africa -- Eastern Cape , Irrigation -- South Africa -- Eastern Cape , Irrigation farming -- South Africa -- Eastern Cape
- Description: This investigation is conducted against the background of current attempts to rehabilitate and revive the now defunct Tyhefu irrigation scheme. The poor track record of many irrigation schemes (despite huge investments) in the former homelands has prompted the government to reconsider its active and direct role in small-scale irrigation farming. This has resulted in the closure of many irrigation schemes including Tyhefu irrigation scheme. The new policy framework in South Africa, known as the irrigation management transfer, is premised on the transfer of ownership, authority and responsibility of small-scale irrigation schemes from government to the farmers. Tyhefu irrigation scheme was a state-driven, top-down initiative. This study argues that the justifications for the Tyhefu irrigation scheme were conflated, with the result that the need for political control of the Tyhefu area far outweighed the considerations regarding the financial viability and sustainability of the proposed project. Given the repressive political climate of the time in South Africa, the planners' proposals were a mechanism for the realization of the socio-political and economic agendas of the apartheid state and Ciskei government. Although technical factors critical for project success were examined, little or no attention was paid to the socio-economic aspects. For the planners, the main requirements for success entailed centralized managerial control, no participation of the beneficiaries, capital intensive and sophisticated agricultural techniques and the production of high value crops. Therefore, it can be argued that the nature of the planning and implementation of the Tyhefu irrigation scheme was ill-conceived, short-sighted and misguided. A review of the literature on irrigation development on the African continent provided useful insights for this study. The lessons from irrigation development experience in Sub-Saharan Africa indicate that the continent is littered with examples of derelict and costly failures. What stands out in many of these irrigation projects is their over-emphasis on technical issues to the complete neglect of human and other social aspects. Working partnerships between the farmers and irrigation scheme management could, thus, not be realized. Almost without exception the case studies used here indicate that the industrious type of farmer was never developed as was envisioned in the planning documents. Neither were rural livelihoods improved in a sustainable manner. The findings of this study suggest that irrigation management transfer is a complex and delicate process. In this new set of arrangements, beneficiaries face formidable challenges in terms of capacity (human and financial) if small-scale irrigation farming is to become a viable sector. No doubt, the viability and sustainability of the Tyhefu irrigation scheme demands a comprehensive package of interventions that address various issues of markets and marketing, capital investment and access to finance, technology, education and training, support and extension services. It is evident that institutional aspects and the related issue of functional literacy require much more attention than thus far. As a result, at the moment there is no possibility for independent agricultural production. , KMBT_363
- Full Text:
- Date Issued: 2004
- Authors: Sishuta, Happy Babalwa
- Date: 2004
- Subjects: Farms, Small -- South Africa -- Eastern Cape , Irrigation -- South Africa -- Eastern Cape , Irrigation farming -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3344 , http://hdl.handle.net/10962/d1004924 , Farms, Small -- South Africa -- Eastern Cape , Irrigation -- South Africa -- Eastern Cape , Irrigation farming -- South Africa -- Eastern Cape
- Description: This investigation is conducted against the background of current attempts to rehabilitate and revive the now defunct Tyhefu irrigation scheme. The poor track record of many irrigation schemes (despite huge investments) in the former homelands has prompted the government to reconsider its active and direct role in small-scale irrigation farming. This has resulted in the closure of many irrigation schemes including Tyhefu irrigation scheme. The new policy framework in South Africa, known as the irrigation management transfer, is premised on the transfer of ownership, authority and responsibility of small-scale irrigation schemes from government to the farmers. Tyhefu irrigation scheme was a state-driven, top-down initiative. This study argues that the justifications for the Tyhefu irrigation scheme were conflated, with the result that the need for political control of the Tyhefu area far outweighed the considerations regarding the financial viability and sustainability of the proposed project. Given the repressive political climate of the time in South Africa, the planners' proposals were a mechanism for the realization of the socio-political and economic agendas of the apartheid state and Ciskei government. Although technical factors critical for project success were examined, little or no attention was paid to the socio-economic aspects. For the planners, the main requirements for success entailed centralized managerial control, no participation of the beneficiaries, capital intensive and sophisticated agricultural techniques and the production of high value crops. Therefore, it can be argued that the nature of the planning and implementation of the Tyhefu irrigation scheme was ill-conceived, short-sighted and misguided. A review of the literature on irrigation development on the African continent provided useful insights for this study. The lessons from irrigation development experience in Sub-Saharan Africa indicate that the continent is littered with examples of derelict and costly failures. What stands out in many of these irrigation projects is their over-emphasis on technical issues to the complete neglect of human and other social aspects. Working partnerships between the farmers and irrigation scheme management could, thus, not be realized. Almost without exception the case studies used here indicate that the industrious type of farmer was never developed as was envisioned in the planning documents. Neither were rural livelihoods improved in a sustainable manner. The findings of this study suggest that irrigation management transfer is a complex and delicate process. In this new set of arrangements, beneficiaries face formidable challenges in terms of capacity (human and financial) if small-scale irrigation farming is to become a viable sector. No doubt, the viability and sustainability of the Tyhefu irrigation scheme demands a comprehensive package of interventions that address various issues of markets and marketing, capital investment and access to finance, technology, education and training, support and extension services. It is evident that institutional aspects and the related issue of functional literacy require much more attention than thus far. As a result, at the moment there is no possibility for independent agricultural production. , KMBT_363
- Full Text:
- Date Issued: 2004
The role of school management teams in school improvement
- Authors: Sister, Loliwe Fezeka
- Date: 2004
- Subjects: School management teams -- South Africa , School improvement programs -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9489 , http://hdl.handle.net/10948/372 , School management teams -- South Africa , School improvement programs -- South Africa
- Description: This study is aimed at investigating the role of the School Management Team (SMT) in school improvement. The investigation was carried out using the qualitative approach and the study is underpinned by the interpretive paradigm. The declining performance of some schools academically as reflected by the end of year results, as well as the confusion that engulfed me on assuming duty on my appointment as a head of department of Science and, therefore, becoming part of the SMT in my school, encouraged me to investigate the role of the SMT in school improvement. The study covers, among others, the following areas: § Functions performed by the SMT members. § Challenges faced by the SMT members in their management practice. § Ways of addressing these challenges. Methods of data collection used in this study were interviews, questionnaires, own observations as well as the analysis of documents. The main recommendations emanating from the study are that SMT members should be better equipped for their roles through workshops and in-service training and that the respective roles of SMT and School Governing Body (SGB) members should be better demarcated by the Department of Education.
- Full Text:
- Date Issued: 2004
- Authors: Sister, Loliwe Fezeka
- Date: 2004
- Subjects: School management teams -- South Africa , School improvement programs -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9489 , http://hdl.handle.net/10948/372 , School management teams -- South Africa , School improvement programs -- South Africa
- Description: This study is aimed at investigating the role of the School Management Team (SMT) in school improvement. The investigation was carried out using the qualitative approach and the study is underpinned by the interpretive paradigm. The declining performance of some schools academically as reflected by the end of year results, as well as the confusion that engulfed me on assuming duty on my appointment as a head of department of Science and, therefore, becoming part of the SMT in my school, encouraged me to investigate the role of the SMT in school improvement. The study covers, among others, the following areas: § Functions performed by the SMT members. § Challenges faced by the SMT members in their management practice. § Ways of addressing these challenges. Methods of data collection used in this study were interviews, questionnaires, own observations as well as the analysis of documents. The main recommendations emanating from the study are that SMT members should be better equipped for their roles through workshops and in-service training and that the respective roles of SMT and School Governing Body (SGB) members should be better demarcated by the Department of Education.
- Full Text:
- Date Issued: 2004
A critical examination of the income tax provisions relating to the taxation of foreign income of residents as defined
- Authors: Smith, William Nevel
- Date: 2004
- Subjects: Income tax -- South Africa , Income tax -- Foreign income -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:8961 , http://hdl.handle.net/10948/d1019676
- Description: The Budget speech of 23 February 2000 by the Minister of Finance marked the introduction of significant changes to the income tax system of the Republic of South Africa (Republic). A residence-based system of taxation (RBT) was adopted for years of assessment commencing on or after 1 January 2001 and Capital Gains Tax (CGT) was introduced with effect from 1 October 2001. According to the 2000 Budget Review a move to a residence-based system would significantly broaden the tax base, limit opportunities for tax arbitrage and bring the tax system in line with generally accepted international practice. The relaxation of exchange controls for South African residents with effect from 1 July 1997 made it possible for residents to invest limited funds offshore. The Fifth Interim Report of the Katz Commission suggested that if exchange controls were relaxed, the taxation of active income should remain on a source basis, but that passive income should be taxed on a residence basis. As a result deemed source rules in the form of section 9C and 9D were introduced into the Act with effect from 1 July 1997 and applied to “investment income” as defined. Section 9C taxed investment income of both residents and non-residents (from activities carried on by a permanent establishment in the Republic). Section 9D taxed investment income of controlled foreign entities and investment income arising from donations, settlements or other dispositions in the hands of residents. The taxation of foreign dividends with effect from 23 February 2000 as a first phase in the move to a residence based system, lead to the introduction of s 9E. Foreign Dividends were taxed in the hands of residents subject to certain exemptions. The basic interest exemption was extended to foreign dividends. Section 6quat was revised to extend the rebate to foreign dividends and profits of a company from which dividends were declared. Section 9D was amended to cater for foreign dividends received by or accrued to controlled foreign entities. The implementation of a full residence-based system of taxation with effect from years of assessment commencing on or after 1 January 2001 required amendments to various sections of the Income Tax Act as well as the introduction of new sections. A residence minus system was adopted which means that residents as defined are now taxed on their world- wide income with certain exemptions. Non-residents are taxed on their income from sources within or deemed to be within the Republic. The provisions relating to the taxation of foreign income of residents is complex; adding to the complexity is the fact that several changes have already been made to these provisions since the inception of the world-wide basis of taxation. The provisions must also be interpreted against the background of any double taxation agreement (DTA) between the Republic and the relevant foreign country as the applicable DTA may override the Republic domestic legislation. For purposes of this treatise the amending Acts enacted up to the end of December 2003 are taken into account. Hardly five years after the Katz commission of inquiry into the tax structure concluded that RBT and CGT were too complicated to be administered by SARS, the implementation of RBT and CGT were announced in the 2000 Budget. A detailed examination of the provisions relating to foreign income of residents as defined was undertaken. Interpretational issues to be clarified by legislation and certain planning issues are highlighted. It is essential to understand and carefully consider the Republic tax laws and the relevant double taxation agreements, for the successful application of the provisions. Careful planning before concluding transactions is of vital importance in order to avoid or minimize any unwanted tax consequences resulting from the RBT and CGT provisions.
- Full Text:
- Date Issued: 2004
- Authors: Smith, William Nevel
- Date: 2004
- Subjects: Income tax -- South Africa , Income tax -- Foreign income -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:8961 , http://hdl.handle.net/10948/d1019676
- Description: The Budget speech of 23 February 2000 by the Minister of Finance marked the introduction of significant changes to the income tax system of the Republic of South Africa (Republic). A residence-based system of taxation (RBT) was adopted for years of assessment commencing on or after 1 January 2001 and Capital Gains Tax (CGT) was introduced with effect from 1 October 2001. According to the 2000 Budget Review a move to a residence-based system would significantly broaden the tax base, limit opportunities for tax arbitrage and bring the tax system in line with generally accepted international practice. The relaxation of exchange controls for South African residents with effect from 1 July 1997 made it possible for residents to invest limited funds offshore. The Fifth Interim Report of the Katz Commission suggested that if exchange controls were relaxed, the taxation of active income should remain on a source basis, but that passive income should be taxed on a residence basis. As a result deemed source rules in the form of section 9C and 9D were introduced into the Act with effect from 1 July 1997 and applied to “investment income” as defined. Section 9C taxed investment income of both residents and non-residents (from activities carried on by a permanent establishment in the Republic). Section 9D taxed investment income of controlled foreign entities and investment income arising from donations, settlements or other dispositions in the hands of residents. The taxation of foreign dividends with effect from 23 February 2000 as a first phase in the move to a residence based system, lead to the introduction of s 9E. Foreign Dividends were taxed in the hands of residents subject to certain exemptions. The basic interest exemption was extended to foreign dividends. Section 6quat was revised to extend the rebate to foreign dividends and profits of a company from which dividends were declared. Section 9D was amended to cater for foreign dividends received by or accrued to controlled foreign entities. The implementation of a full residence-based system of taxation with effect from years of assessment commencing on or after 1 January 2001 required amendments to various sections of the Income Tax Act as well as the introduction of new sections. A residence minus system was adopted which means that residents as defined are now taxed on their world- wide income with certain exemptions. Non-residents are taxed on their income from sources within or deemed to be within the Republic. The provisions relating to the taxation of foreign income of residents is complex; adding to the complexity is the fact that several changes have already been made to these provisions since the inception of the world-wide basis of taxation. The provisions must also be interpreted against the background of any double taxation agreement (DTA) between the Republic and the relevant foreign country as the applicable DTA may override the Republic domestic legislation. For purposes of this treatise the amending Acts enacted up to the end of December 2003 are taken into account. Hardly five years after the Katz commission of inquiry into the tax structure concluded that RBT and CGT were too complicated to be administered by SARS, the implementation of RBT and CGT were announced in the 2000 Budget. A detailed examination of the provisions relating to foreign income of residents as defined was undertaken. Interpretational issues to be clarified by legislation and certain planning issues are highlighted. It is essential to understand and carefully consider the Republic tax laws and the relevant double taxation agreements, for the successful application of the provisions. Careful planning before concluding transactions is of vital importance in order to avoid or minimize any unwanted tax consequences resulting from the RBT and CGT provisions.
- Full Text:
- Date Issued: 2004
An analysis of the performance of a South African stainless steel manufacturer in localising the demand for corrosion resistant steels within the Eastern Cape catalytic converter industry
- Authors: Soiné, Robert Paul
- Date: 2004
- Subjects: Automobiles -- Catalytic converters , Steel industry and trade -- South Africa -- Eastern Cape , Corrosion-resistant materials
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:10878 , http://hdl.handle.net/10948/200
- Description: Commercial decisions are been made with respect to the competitive advantage of manufacturing catalytic converters in South Africa. This thesis identifies those factors relating to the sourcing of stainless steel and the impact it has of securing future business in a competitive environment. The catalytic converter industry requires the support of a stainless steel plant that provides high quality products at a competitive price, while keeping abreast with international developments.
- Full Text:
- Date Issued: 2004
- Authors: Soiné, Robert Paul
- Date: 2004
- Subjects: Automobiles -- Catalytic converters , Steel industry and trade -- South Africa -- Eastern Cape , Corrosion-resistant materials
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:10878 , http://hdl.handle.net/10948/200
- Description: Commercial decisions are been made with respect to the competitive advantage of manufacturing catalytic converters in South Africa. This thesis identifies those factors relating to the sourcing of stainless steel and the impact it has of securing future business in a competitive environment. The catalytic converter industry requires the support of a stainless steel plant that provides high quality products at a competitive price, while keeping abreast with international developments.
- Full Text:
- Date Issued: 2004
The mentally retarded offender in a forensic setting: a South African study
- Authors: Solomons, Warren Stanley
- Date: 2004
- Subjects: Mentally ill offenders -- South Africa , Forensic psychology , People with mental disabilities and crime -- South Africa , People with mental disabilities -- Rehabilitation , Mental health laws -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3063 , http://hdl.handle.net/10962/d1002572 , Mentally ill offenders -- South Africa , Forensic psychology , People with mental disabilities and crime -- South Africa , People with mental disabilities -- Rehabilitation , Mental health laws -- South Africa
- Description: This study examined, within the South African context, the prevalence of mental retardation in a forensic observation setting, and the impediments of and successes to forensic rehabilitation. The results of the study indicated that a significant amount of forensic observation patients (25.16%) are ultimately diagnosed as being mentally retarded, with 39.24 percent of such offenders being found unfit to plead. Further 32.91 percent of the same sample was found to be not responsible for their actions. A link was also drawn between the mentally retarded offender and violent offenses. The advantages and disadvantages of a current rehabilitative process are discussed in light of alternate community-based forms of rehabilitation that are being implemented in other countries, for example the United States of America, with a view towards investigated their usefulness and adaptability to South African circumstances. The findings of the study have implications for mental health professionals working within forensic settings concerning the future management of mentally retarded offenders, particularly within the rehabilitative process .
- Full Text:
- Date Issued: 2004
- Authors: Solomons, Warren Stanley
- Date: 2004
- Subjects: Mentally ill offenders -- South Africa , Forensic psychology , People with mental disabilities and crime -- South Africa , People with mental disabilities -- Rehabilitation , Mental health laws -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3063 , http://hdl.handle.net/10962/d1002572 , Mentally ill offenders -- South Africa , Forensic psychology , People with mental disabilities and crime -- South Africa , People with mental disabilities -- Rehabilitation , Mental health laws -- South Africa
- Description: This study examined, within the South African context, the prevalence of mental retardation in a forensic observation setting, and the impediments of and successes to forensic rehabilitation. The results of the study indicated that a significant amount of forensic observation patients (25.16%) are ultimately diagnosed as being mentally retarded, with 39.24 percent of such offenders being found unfit to plead. Further 32.91 percent of the same sample was found to be not responsible for their actions. A link was also drawn between the mentally retarded offender and violent offenses. The advantages and disadvantages of a current rehabilitative process are discussed in light of alternate community-based forms of rehabilitation that are being implemented in other countries, for example the United States of America, with a view towards investigated their usefulness and adaptability to South African circumstances. The findings of the study have implications for mental health professionals working within forensic settings concerning the future management of mentally retarded offenders, particularly within the rehabilitative process .
- Full Text:
- Date Issued: 2004
Design of a performance evaluation tool for multimedia databases with special reference to Oracle
- Authors: Stakemire, Tonia
- Date: 2004
- Subjects: Oracle (Computer file) , Application software -- Evaluation , Database management -- Evaluation
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4705 , http://hdl.handle.net/10962/d1015975
- Description: Increased production and use of multimedia data has led to the development of a more advanced Database Management System (DBMS), like an Object Relational Database Management System (ORDBMS). These advanced databases are necessitated by the complexity in structure and the functionality required by multimedia data. Unfortunately, no suitable benchmarks exist with which to test the performance of databases when handling multimedia data. This thesis describes the design of a benchmark to measure the performance of basic functionality found in multimedia databases. The benchmark, called MORD (Multimedia Object Relational Databases), targets Oracle, a well known commercial Object Relational Database Management System (ORDBMS) that can handle multimedia data. Although MORD targets Oracle, it can easily be applied to other Multimedia Database Management System (MMDBMS) as a result of a design that stressed its portability, and simplicity. MORD consists of a database schema, test data, and code to simulate representative queries on multimedia databases. A number of experiments are described that validate MORD and ensure its correct design and that its objectives are met. A by-product of these experiments is an initial understanding of the performance of multimedia databases. The experiments show that with multimedia data the buffer cache should be at least large enough to hold the largest dataset, a bigger block size improves the performance, and turning off logging and caching for bulk loading improves the performance. MORD can be used to compare different ORDBMS or to assist in the configuration of a specific database.
- Full Text:
- Date Issued: 2004
- Authors: Stakemire, Tonia
- Date: 2004
- Subjects: Oracle (Computer file) , Application software -- Evaluation , Database management -- Evaluation
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4705 , http://hdl.handle.net/10962/d1015975
- Description: Increased production and use of multimedia data has led to the development of a more advanced Database Management System (DBMS), like an Object Relational Database Management System (ORDBMS). These advanced databases are necessitated by the complexity in structure and the functionality required by multimedia data. Unfortunately, no suitable benchmarks exist with which to test the performance of databases when handling multimedia data. This thesis describes the design of a benchmark to measure the performance of basic functionality found in multimedia databases. The benchmark, called MORD (Multimedia Object Relational Databases), targets Oracle, a well known commercial Object Relational Database Management System (ORDBMS) that can handle multimedia data. Although MORD targets Oracle, it can easily be applied to other Multimedia Database Management System (MMDBMS) as a result of a design that stressed its portability, and simplicity. MORD consists of a database schema, test data, and code to simulate representative queries on multimedia databases. A number of experiments are described that validate MORD and ensure its correct design and that its objectives are met. A by-product of these experiments is an initial understanding of the performance of multimedia databases. The experiments show that with multimedia data the buffer cache should be at least large enough to hold the largest dataset, a bigger block size improves the performance, and turning off logging and caching for bulk loading improves the performance. MORD can be used to compare different ORDBMS or to assist in the configuration of a specific database.
- Full Text:
- Date Issued: 2004