Design and implementation of a network revenue management architecture for marginalised communities
- Authors: Tarwireyi, Paul
- Date: 2007
- Subjects: Community development -- South Africa -- Eastern Cape , Computer network architectures -- South Africa -- Design and construction , Computer network protocols -- South Africa -- Eastern Cape -- Design and construction , Revenue management , Computer networks -- Social aspects
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11374 , http://hdl.handle.net/10353/72 , Community development -- South Africa -- Eastern Cape , Computer network architectures -- South Africa -- Design and construction , Computer network protocols -- South Africa -- Eastern Cape -- Design and construction , Revenue management , Computer networks -- Social aspects
- Description: Rural Internet connectivity projects aimed at bridging the digital divide have mushroomed across many developing countries. Most of the projects are deployed as community centred projects. In most of the cases the initial deployment of these projects is funded by governments, multilateral institutions and non-governmental organizations. After the initial deployment, financial sustainability remains one of the greatest challenges facing these projects. In the light of this, externally funded ICT4D interventions should just be used for “bootstrapping” purposes. The communities should be “groomed” to take care of and sustain these projects, eliminating as soon as possible a dependency on external funding. This master thesis presents the design and the implementation of a generic architecture for the management of the costs associated with running a computer network connected to the Internet, The proposed system, called the Network Revenue Management System, enables a network to generate revenue, by charging users for the utilization of network resources. The novelty of the system resides in its flexibility and adaptability, which allow the exploration of both conventional and non-conventional billing options, via the use of suitable ‘adapters’. The final goal of the exploration made possible by this system is the establishment of what is regarded as equitable charging in rural, marginalized communities - such as the community in Dwesa, South Africa.
- Full Text:
- Date Issued: 2007
- Authors: Tarwireyi, Paul
- Date: 2007
- Subjects: Community development -- South Africa -- Eastern Cape , Computer network architectures -- South Africa -- Design and construction , Computer network protocols -- South Africa -- Eastern Cape -- Design and construction , Revenue management , Computer networks -- Social aspects
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11374 , http://hdl.handle.net/10353/72 , Community development -- South Africa -- Eastern Cape , Computer network architectures -- South Africa -- Design and construction , Computer network protocols -- South Africa -- Eastern Cape -- Design and construction , Revenue management , Computer networks -- Social aspects
- Description: Rural Internet connectivity projects aimed at bridging the digital divide have mushroomed across many developing countries. Most of the projects are deployed as community centred projects. In most of the cases the initial deployment of these projects is funded by governments, multilateral institutions and non-governmental organizations. After the initial deployment, financial sustainability remains one of the greatest challenges facing these projects. In the light of this, externally funded ICT4D interventions should just be used for “bootstrapping” purposes. The communities should be “groomed” to take care of and sustain these projects, eliminating as soon as possible a dependency on external funding. This master thesis presents the design and the implementation of a generic architecture for the management of the costs associated with running a computer network connected to the Internet, The proposed system, called the Network Revenue Management System, enables a network to generate revenue, by charging users for the utilization of network resources. The novelty of the system resides in its flexibility and adaptability, which allow the exploration of both conventional and non-conventional billing options, via the use of suitable ‘adapters’. The final goal of the exploration made possible by this system is the establishment of what is regarded as equitable charging in rural, marginalized communities - such as the community in Dwesa, South Africa.
- Full Text:
- Date Issued: 2007
Determination of the botanical composition of black rhinoceros (Diceros bicornis) dung using the rbcL gene as a molecular marker, and analysis of antioxidant and phenolic content of its browse
- Authors: Bulani, Siyavuya Ishmael
- Date: 2007 , 2013-06-25
- Subjects: Black rhinoceros -- Food , Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- Analysis -- South Africa -- Eastern Cape , Plant ecology -- South Africa -- Eastern Cape , Genetic markers , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4070 , http://hdl.handle.net/10962/d1006468 , Black rhinoceros -- Food , Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- Analysis -- South Africa -- Eastern Cape , Plant ecology -- South Africa -- Eastern Cape , Genetic markers , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants
- Description: The black rhinoceros remains one of the world's extremely endangered species despite a variety of policies to protect it. The black rhinoceros population at the Great Fish River Reserve (GFRR) in the Eastern Cape in South Africa has increased steadily since their re-introduction in 1986. This megaherbivore is a browser, with a diet obtained largely from the short and medium succulent thicket of the GFRR. Knowledge of the preferential diet of the black rhinoceros on the reserve is an important factor for the effective management of the land and the herbivores that compete for its resources. The dietary preferences of the black rhinoceros at the reserve have been established using backtracking methods. In this study the rbcL gene was used to establish an rbcL gene database of the plants from the GFRR and determine the botanical composition of the black rhinoceros dung from the GFRR. Due to the limited number of rbcL gene plant sequences from the GFRR deposited in the GenBank database, 18 plant species from the GFRR were sequenced. Sequence analyses between the partial rbcL gene sequences generated were able to distinguish between plants down to species level. Plant species from the family Euphorbiaceae and Fabaceae showed sequence variation at intra-specific level compared to those of Tiliaceae which were more conserved. The generated rbcL gene sequences from seasonal dung samples were compared to the rbcL gene sequenced from 18 plant species obtained from the GFRR and those from the GenBank database. A wide range of plant species were identified from the dung samples. There were no major differences in botanical composition between the dung samples, except that Grewia spp. were found to dominate in almost all seasons. The results obtained on the free radical scavenging activity of the extracts against 2,2-Diphenyl-l-picrylhydrazyl (DPPH) increased in the order of methanol > ethyl acetate > chloroform. The DPPH free radical scavenging activity of the methanol plant extracts increased in the order Brachylaena elliptica > Plumbago auriculata > Grewia robusta > Azima tetracantha. Methanol extracts on the TLC plate sprayed with Fe³⁺-2,4,6-Tri-2-pyridyl-s-triazine (TPTZ) showed that the compounds present in the extracts react differently to ferric ion, with most compounds unable to reduce ferric ion. Furthermore the methanol extracts were able to exhibit reduction potentials vs. Ag/AgCl at low concentrations. The compounds in the extracts were shown to be phenolic acids and flavonoid glycosides.
- Full Text:
- Date Issued: 2007
- Authors: Bulani, Siyavuya Ishmael
- Date: 2007 , 2013-06-25
- Subjects: Black rhinoceros -- Food , Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- Analysis -- South Africa -- Eastern Cape , Plant ecology -- South Africa -- Eastern Cape , Genetic markers , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4070 , http://hdl.handle.net/10962/d1006468 , Black rhinoceros -- Food , Black rhinoceros -- South Africa -- Eastern Cape , Browse (Animal food) -- Analysis -- South Africa -- Eastern Cape , Plant ecology -- South Africa -- Eastern Cape , Genetic markers , Black rhinoceros -- Manure -- Analysis , Phenols , Antioxidants
- Description: The black rhinoceros remains one of the world's extremely endangered species despite a variety of policies to protect it. The black rhinoceros population at the Great Fish River Reserve (GFRR) in the Eastern Cape in South Africa has increased steadily since their re-introduction in 1986. This megaherbivore is a browser, with a diet obtained largely from the short and medium succulent thicket of the GFRR. Knowledge of the preferential diet of the black rhinoceros on the reserve is an important factor for the effective management of the land and the herbivores that compete for its resources. The dietary preferences of the black rhinoceros at the reserve have been established using backtracking methods. In this study the rbcL gene was used to establish an rbcL gene database of the plants from the GFRR and determine the botanical composition of the black rhinoceros dung from the GFRR. Due to the limited number of rbcL gene plant sequences from the GFRR deposited in the GenBank database, 18 plant species from the GFRR were sequenced. Sequence analyses between the partial rbcL gene sequences generated were able to distinguish between plants down to species level. Plant species from the family Euphorbiaceae and Fabaceae showed sequence variation at intra-specific level compared to those of Tiliaceae which were more conserved. The generated rbcL gene sequences from seasonal dung samples were compared to the rbcL gene sequenced from 18 plant species obtained from the GFRR and those from the GenBank database. A wide range of plant species were identified from the dung samples. There were no major differences in botanical composition between the dung samples, except that Grewia spp. were found to dominate in almost all seasons. The results obtained on the free radical scavenging activity of the extracts against 2,2-Diphenyl-l-picrylhydrazyl (DPPH) increased in the order of methanol > ethyl acetate > chloroform. The DPPH free radical scavenging activity of the methanol plant extracts increased in the order Brachylaena elliptica > Plumbago auriculata > Grewia robusta > Azima tetracantha. Methanol extracts on the TLC plate sprayed with Fe³⁺-2,4,6-Tri-2-pyridyl-s-triazine (TPTZ) showed that the compounds present in the extracts react differently to ferric ion, with most compounds unable to reduce ferric ion. Furthermore the methanol extracts were able to exhibit reduction potentials vs. Ag/AgCl at low concentrations. The compounds in the extracts were shown to be phenolic acids and flavonoid glycosides.
- Full Text:
- Date Issued: 2007
Development and assessment of an oxytocin parenteral dosage form prepared using pluronic ® F127
- Authors: Chaibva, Faith Anesu
- Date: 2007
- Subjects: Oxytocin -- Therapeutic use , Drugs -- Dosage forms , Pregnancy -- Complications -- Management
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3747 , http://hdl.handle.net/10962/d1003225 , Oxytocin -- Therapeutic use , Drugs -- Dosage forms , Pregnancy -- Complications -- Management
- Full Text:
- Date Issued: 2007
- Authors: Chaibva, Faith Anesu
- Date: 2007
- Subjects: Oxytocin -- Therapeutic use , Drugs -- Dosage forms , Pregnancy -- Complications -- Management
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3747 , http://hdl.handle.net/10962/d1003225 , Oxytocin -- Therapeutic use , Drugs -- Dosage forms , Pregnancy -- Complications -- Management
- Full Text:
- Date Issued: 2007
Development and in vitro evaluation of a clobetasol 17-propionate topical cream formulation
- Authors: Wa Kasongo, Kasongo
- Date: 2007
- Subjects: Adrenocortical hormones , Adrenocortical hormones -- Physiological effect , Drugs -- Testing , Drug development , Dermatopharmacology
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: vital:3799 , http://hdl.handle.net/10962/d1003277 , Adrenocortical hormones , Adrenocortical hormones -- Physiological effect , Drugs -- Testing , Drug development , Dermatopharmacology
- Description: One of the primary contributing factors to the escalating costs of health care is the high cost of innovator pharmaceutical products. As a consequence, health authorities in various countries and in particular in the developing world have identified generic prescribing and generic substitution as possible strategies to contain the escalating costs of health care provision. There is therefore a need for formulation scientists in developing countries to invest more time in the research and development of generic formulations. Clobetasol 17-propionate (CP) generic cream formulations containing 0.05% w/w of the drug were manufactured and characterized using in vitro testing. Formulation development studies were preceded by the development and validation of an RP-HPLC with UV detection for the quantitation and characterization of CP in innovator and generic cream formulations during formulation development and assessment studies. Furthermore the in vitro release ates of CP release from innovator and generic cream formulations were monitored using a validated in vitro release test method developed in these studies. The formulation of CP cream products was accomplished using a variety of commercially available mixed primary emulsifiers, such as Estol® 1474, Ritapro® 200, Emulcire® 61 WL and Gelot® 64. Successful formulations were selected based on their ability to remain physically stable immediately after manufacture and for 24 hours after storage at room temperature (22°C). Estol® 1474 was found to produce an unstable cream and was therefore not investigated further. The other three emulgents produced stable creams, but only the in vitro release profile of CP from a cream manufactured to contain Gelot® 64 was found to be statistically similar to that of the innovator formulation. Therefore the cream containing Gelot® 64 was selected as the most appropriate prototype generic cream formulation and was characterized in vitro in terms of CP content, viscosity, pH and in vitro release rate. Data generated from these studies were compared to those of the innovator product, Dermovate® cream, using statistical methods. The CP content, pH and in vitro release rate data of the CP formulation were similar to those of the innovator product, however the intrinsic viscosity of Dermovate® cream was almost three (3) times greater than the intrinsic viscosity of the test formulation developed using Gelot® 64. The CP cream formulation developed in these studies was stored for 4 weeks at 40 ± 2°C and 25 ± 5% RH in an incubator and the formulation was found to be stable. A formulation has been developed and assessed and found to be suitable for use as a topical semi-solid dosage form for CP.
- Full Text:
- Date Issued: 2007
- Authors: Wa Kasongo, Kasongo
- Date: 2007
- Subjects: Adrenocortical hormones , Adrenocortical hormones -- Physiological effect , Drugs -- Testing , Drug development , Dermatopharmacology
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: vital:3799 , http://hdl.handle.net/10962/d1003277 , Adrenocortical hormones , Adrenocortical hormones -- Physiological effect , Drugs -- Testing , Drug development , Dermatopharmacology
- Description: One of the primary contributing factors to the escalating costs of health care is the high cost of innovator pharmaceutical products. As a consequence, health authorities in various countries and in particular in the developing world have identified generic prescribing and generic substitution as possible strategies to contain the escalating costs of health care provision. There is therefore a need for formulation scientists in developing countries to invest more time in the research and development of generic formulations. Clobetasol 17-propionate (CP) generic cream formulations containing 0.05% w/w of the drug were manufactured and characterized using in vitro testing. Formulation development studies were preceded by the development and validation of an RP-HPLC with UV detection for the quantitation and characterization of CP in innovator and generic cream formulations during formulation development and assessment studies. Furthermore the in vitro release ates of CP release from innovator and generic cream formulations were monitored using a validated in vitro release test method developed in these studies. The formulation of CP cream products was accomplished using a variety of commercially available mixed primary emulsifiers, such as Estol® 1474, Ritapro® 200, Emulcire® 61 WL and Gelot® 64. Successful formulations were selected based on their ability to remain physically stable immediately after manufacture and for 24 hours after storage at room temperature (22°C). Estol® 1474 was found to produce an unstable cream and was therefore not investigated further. The other three emulgents produced stable creams, but only the in vitro release profile of CP from a cream manufactured to contain Gelot® 64 was found to be statistically similar to that of the innovator formulation. Therefore the cream containing Gelot® 64 was selected as the most appropriate prototype generic cream formulation and was characterized in vitro in terms of CP content, viscosity, pH and in vitro release rate. Data generated from these studies were compared to those of the innovator product, Dermovate® cream, using statistical methods. The CP content, pH and in vitro release rate data of the CP formulation were similar to those of the innovator product, however the intrinsic viscosity of Dermovate® cream was almost three (3) times greater than the intrinsic viscosity of the test formulation developed using Gelot® 64. The CP cream formulation developed in these studies was stored for 4 weeks at 40 ± 2°C and 25 ± 5% RH in an incubator and the formulation was found to be stable. A formulation has been developed and assessed and found to be suitable for use as a topical semi-solid dosage form for CP.
- Full Text:
- Date Issued: 2007
Development of a school environmental policy to enable active learning in the context of the National Curriculum Statement
- Authors: Mvula-Jamela, Lungiswa Gwen
- Date: 2007
- Subjects: Environmental policy -- Study and teaching (Primary) -- South Africa -- Grahamstown Environmental education -- Study and teaching (Primary) -- South Africa -- Grahamstown Environmental education -- Activity programs -- South Africa -- Grahamstown Environmental education -- South Africa -- Grahamstown -- Case studies Competency-based education -- South Africa -- Grahamstown Teacher participation in curriculum planning -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1958 , http://hdl.handle.net/10962/d1008376
- Description: The transformation processes occurring in the South African curriculum context has highlighted a need for improving ways of interpreting and implementing curriculum requirements, in ways that are relevant to the context of learners and their experiences. Outcomes Based Education (OBE) encourages teachers to develop learner centred and active learning approaches. In this research I explore the development of how a School Environmental Policy can contribute to active learning in the context of the National Curriculum Statement for Grades R-9 (NCS R-9). I employed a participatory action research approach in which I worked with other teachers in my school to develop a School Environmental Policy, and then implement associated lessons. In cycle 1 this research focused on the School Environmental Policy development processes. In cycle 2 the research focused on designing and implementing three Lesson Plans in Makana Public Primary School (in three phases). I used a range of data generation strategies such as observations, use of a reflective journal, semi-structured interviews, focus group discussions, a workshop, photographs and document analysis to generate data for the study. All participants collaboratively discussed and agreed upon the research , and the two teachers who developed the lessons with me also reflected on the process of Lesson Planning and active learning, but I was responsible for the final interpretation presented in this thesis. The research indicates that the School Environmental Policy led to the planning of active learning processes and that the School Environmental Policy and the active learn ing approach are consistent with OBE policy and philosophy. The study also indicates that the School Environmental Policy and the active learning approach strengthened the use of Learning Outcomes, but not necessarily Assessment Standards and that the active learning approach promoted enquiry in lessons. The research further indicates that the School Environmental Policy and active learning processes contributed to school improvement and work towards a healthy environment. The School Environmental Policy also encouraged educators to address school community environmental issues and build stronger links with parents. The study also led to a set of recommendations to improve the School Environmental Policy and active learning process in ways that address the NCS requirements for learning and assessment.
- Full Text:
- Date Issued: 2007
- Authors: Mvula-Jamela, Lungiswa Gwen
- Date: 2007
- Subjects: Environmental policy -- Study and teaching (Primary) -- South Africa -- Grahamstown Environmental education -- Study and teaching (Primary) -- South Africa -- Grahamstown Environmental education -- Activity programs -- South Africa -- Grahamstown Environmental education -- South Africa -- Grahamstown -- Case studies Competency-based education -- South Africa -- Grahamstown Teacher participation in curriculum planning -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1958 , http://hdl.handle.net/10962/d1008376
- Description: The transformation processes occurring in the South African curriculum context has highlighted a need for improving ways of interpreting and implementing curriculum requirements, in ways that are relevant to the context of learners and their experiences. Outcomes Based Education (OBE) encourages teachers to develop learner centred and active learning approaches. In this research I explore the development of how a School Environmental Policy can contribute to active learning in the context of the National Curriculum Statement for Grades R-9 (NCS R-9). I employed a participatory action research approach in which I worked with other teachers in my school to develop a School Environmental Policy, and then implement associated lessons. In cycle 1 this research focused on the School Environmental Policy development processes. In cycle 2 the research focused on designing and implementing three Lesson Plans in Makana Public Primary School (in three phases). I used a range of data generation strategies such as observations, use of a reflective journal, semi-structured interviews, focus group discussions, a workshop, photographs and document analysis to generate data for the study. All participants collaboratively discussed and agreed upon the research , and the two teachers who developed the lessons with me also reflected on the process of Lesson Planning and active learning, but I was responsible for the final interpretation presented in this thesis. The research indicates that the School Environmental Policy led to the planning of active learning processes and that the School Environmental Policy and the active learn ing approach are consistent with OBE policy and philosophy. The study also indicates that the School Environmental Policy and the active learning approach strengthened the use of Learning Outcomes, but not necessarily Assessment Standards and that the active learning approach promoted enquiry in lessons. The research further indicates that the School Environmental Policy and active learning processes contributed to school improvement and work towards a healthy environment. The School Environmental Policy also encouraged educators to address school community environmental issues and build stronger links with parents. The study also led to a set of recommendations to improve the School Environmental Policy and active learning process in ways that address the NCS requirements for learning and assessment.
- Full Text:
- Date Issued: 2007
Development of a web-based interface for a wireless sensor network monitoring system
- Authors: Gumbo, Sibukele
- Date: 2007
- Subjects: Wireless LAN , Sensor networks , Wireless communication systems , Web sites -- Design , User interfaces (Computer systems)
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11372 , http://hdl.handle.net/10353/68 , Wireless LAN , Sensor networks , Wireless communication systems , Web sites -- Design , User interfaces (Computer systems)
- Description: In the recent past, wireless sensor technology has undergone advancements in its autonomous data collecting aspects, and has become an area worth investigating in relation to structural monitoring applications. The system described in this thesis aims at acquiring, storing and displaying overhead transmission line related data collected from a wireless sensor network. Open source tools were used in its development and implementation. The inherent linearly aligned topology of transmission line monitoring devices is not without shortcomings; hence analysis of linear node placement, hardware and software components was carried out to determine the feasibility of the system. Their limited data processing capabilities has motivated the development of a post processing wireless sensor application in order to present any collected structural data in an understandable format.
- Full Text:
- Date Issued: 2007
- Authors: Gumbo, Sibukele
- Date: 2007
- Subjects: Wireless LAN , Sensor networks , Wireless communication systems , Web sites -- Design , User interfaces (Computer systems)
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11372 , http://hdl.handle.net/10353/68 , Wireless LAN , Sensor networks , Wireless communication systems , Web sites -- Design , User interfaces (Computer systems)
- Description: In the recent past, wireless sensor technology has undergone advancements in its autonomous data collecting aspects, and has become an area worth investigating in relation to structural monitoring applications. The system described in this thesis aims at acquiring, storing and displaying overhead transmission line related data collected from a wireless sensor network. Open source tools were used in its development and implementation. The inherent linearly aligned topology of transmission line monitoring devices is not without shortcomings; hence analysis of linear node placement, hardware and software components was carried out to determine the feasibility of the system. Their limited data processing capabilities has motivated the development of a post processing wireless sensor application in order to present any collected structural data in an understandable format.
- Full Text:
- Date Issued: 2007
Development of an antiretroviral solid dosage form using multivariate analysis
- Authors: Nqabeni, Luxolo
- Date: 2007
- Subjects: Analysis of variance , Experimental design , Multivariate analysis , Antiretroviral agents -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10145 , http://hdl.handle.net/10948/705 , Analysis of variance , Experimental design , Multivariate analysis , Antiretroviral agents -- South Africa
- Description: The aim of pharmaceutical development is to design a quality product and the manufacturing process to deliver the product in a reproducible manner. The development of a new and generic formulation is based on a large number of experiments. Statistics provides many tools for studying the conditions of formulations and processes and enables us to optimize the same while being able to minimize our experimentation. The purpose of this study was to apply experimental design methodology (DOE) and multivariate analysis to the development and optimization of tablet formulations containing 150 mg lamivudine manufactured by direct compression.
- Full Text:
- Date Issued: 2007
- Authors: Nqabeni, Luxolo
- Date: 2007
- Subjects: Analysis of variance , Experimental design , Multivariate analysis , Antiretroviral agents -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10145 , http://hdl.handle.net/10948/705 , Analysis of variance , Experimental design , Multivariate analysis , Antiretroviral agents -- South Africa
- Description: The aim of pharmaceutical development is to design a quality product and the manufacturing process to deliver the product in a reproducible manner. The development of a new and generic formulation is based on a large number of experiments. Statistics provides many tools for studying the conditions of formulations and processes and enables us to optimize the same while being able to minimize our experimentation. The purpose of this study was to apply experimental design methodology (DOE) and multivariate analysis to the development and optimization of tablet formulations containing 150 mg lamivudine manufactured by direct compression.
- Full Text:
- Date Issued: 2007
Development of an in-situ ß-D-Glucuronidase diagnostic moraxella-based biosensor for potential application in the monitoring of water polluted by faecal material in South Africa
- Authors: Togo, Chamunorwa Aloius
- Date: 2007
- Subjects: Water quality management -- South Africa Water quality bioassay -- South Africa Sewage sludge -- South Africa -- Management Water -- Purification -- Biological treatment -- South Africa Biosensors
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3947 , http://hdl.handle.net/10962/d1004006
- Description: The prevention of outbreaks of waterborne diseases remains a major challenge to public health service providers globally. One of the major obstacles in this effort is the unavailability of on-line and real-time methods for rapid monitoring of faecal pollution to facilitate early warning of contamination of drinking water. The main objective of this study was to develop a β-glucuronidase (GUD)-based method that could be used for the on-line and real-time monitoring of microbial water quality. GUD is a marker enzyme for the faecal indicator bacteria Escherichia coli. This enzyme breaks down the synthetic substrate p-nitrophenyl-β-D-glucuronide (PNPG) to D-glucuronic acid and p-nitrophenol (PNP), which turns yellow under alkaline pH. The enzymatically produced PNP was used to detect GUD activity. In situ GUD assays were performed using running and stagnant water samples from the Bloukrans River, Grahamstown, South Africa. The physico-chemical properties of environmental GUD were determined, after which a liquid bioprobe and a microbial biosensor modified with Moraxella 1A species for the detection of the enzyme activity were developed. In order to determine the reliability and sensitivity of these methods, regression analyses for each method versus E. coli colony forming units (CFU) were performed. The storage stabilities of the bioprobe and biosensor were also investigated. The physico-chemical properties of in situ GUD were different from those of its commercially available counterpart. The temperature optimum for the former was between 35 and 40 °C while for the latter it was 45 °C. Commercial (reference) GUD had a pH optimum of 8.0 while the environmental counterpart exhibited a broad pH optimum of between pH 5.0 and 8.0. The liquid bioprobe had a limit of detection (LOD) of GUD activity equivalent to 2 CFU/100 ml and a detection time of 24 h. The method was less labour intensive and costly than the culturing method. The liquid bioprobe was stable for at least four weeks at room temperature (20 ± 2 °C). The biosensor was prepared by modifying a glassy carbon electrode with PNP degrading Moraxella 1A cells. The biosensor was 100 times more sensitive and rapid (5-20 min) than the spectrophotometric method (24 h), and was also able to detect GUD activity of viable but non-culturable cells. Thus it was more sensitive than the culturing method. Furthermore, the biosensor was selective and costeffective. The possibility of using a Pseudomonas putida JS444 biosensor was also investigated, but it was not as sensitive and selective as the Moraxella 1A biosensor. The Moraxella biosensor, therefore, offered the best option for on-line and real-time microbial water quality monitoring in South African river waters and drinking water supplies.
- Full Text:
- Date Issued: 2007
- Authors: Togo, Chamunorwa Aloius
- Date: 2007
- Subjects: Water quality management -- South Africa Water quality bioassay -- South Africa Sewage sludge -- South Africa -- Management Water -- Purification -- Biological treatment -- South Africa Biosensors
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3947 , http://hdl.handle.net/10962/d1004006
- Description: The prevention of outbreaks of waterborne diseases remains a major challenge to public health service providers globally. One of the major obstacles in this effort is the unavailability of on-line and real-time methods for rapid monitoring of faecal pollution to facilitate early warning of contamination of drinking water. The main objective of this study was to develop a β-glucuronidase (GUD)-based method that could be used for the on-line and real-time monitoring of microbial water quality. GUD is a marker enzyme for the faecal indicator bacteria Escherichia coli. This enzyme breaks down the synthetic substrate p-nitrophenyl-β-D-glucuronide (PNPG) to D-glucuronic acid and p-nitrophenol (PNP), which turns yellow under alkaline pH. The enzymatically produced PNP was used to detect GUD activity. In situ GUD assays were performed using running and stagnant water samples from the Bloukrans River, Grahamstown, South Africa. The physico-chemical properties of environmental GUD were determined, after which a liquid bioprobe and a microbial biosensor modified with Moraxella 1A species for the detection of the enzyme activity were developed. In order to determine the reliability and sensitivity of these methods, regression analyses for each method versus E. coli colony forming units (CFU) were performed. The storage stabilities of the bioprobe and biosensor were also investigated. The physico-chemical properties of in situ GUD were different from those of its commercially available counterpart. The temperature optimum for the former was between 35 and 40 °C while for the latter it was 45 °C. Commercial (reference) GUD had a pH optimum of 8.0 while the environmental counterpart exhibited a broad pH optimum of between pH 5.0 and 8.0. The liquid bioprobe had a limit of detection (LOD) of GUD activity equivalent to 2 CFU/100 ml and a detection time of 24 h. The method was less labour intensive and costly than the culturing method. The liquid bioprobe was stable for at least four weeks at room temperature (20 ± 2 °C). The biosensor was prepared by modifying a glassy carbon electrode with PNP degrading Moraxella 1A cells. The biosensor was 100 times more sensitive and rapid (5-20 min) than the spectrophotometric method (24 h), and was also able to detect GUD activity of viable but non-culturable cells. Thus it was more sensitive than the culturing method. Furthermore, the biosensor was selective and costeffective. The possibility of using a Pseudomonas putida JS444 biosensor was also investigated, but it was not as sensitive and selective as the Moraxella 1A biosensor. The Moraxella biosensor, therefore, offered the best option for on-line and real-time microbial water quality monitoring in South African river waters and drinking water supplies.
- Full Text:
- Date Issued: 2007
Die bestuur van die geintegreerde gehaltebestuurstelsel
- Authors: James, Raymond Oscar
- Date: 2007
- Subjects: Total quality management -- South Africa , Quality assurance -- South Africa
- Language: Afrikaans
- Type: Thesis , Masters , MEd
- Identifier: vital:9540 , http://hdl.handle.net/10948/682 , Total quality management -- South Africa , Quality assurance -- South Africa
- Description: Die doel van hierdie studie was om te kyk hoe effektief die Geïntegreerde Gehaltebestuurstelsel (GGBS), en wel die taksering van opvoeders, bestuur kan word om positiewe resultate by skole te bereik. Die studie is gedoen binne die Interpretivistiese benadering. Data-invordering is gedoen deur middel van vraelyste, observasie en onderhoude. Die studie het getoon dat opvoeders onseker was, juis omdat die Onderwysdepartement nie die nodige leiding gegee en die nodige hulpbronne gehad het nie. Die afgelope twee jaar ( 2006 en 2007 ) egter het die Departement skouer aan die wiel gesit en hulp aan skole verleen, hetsy deur die beskikbaarstelling van die nodige vorms, of die aanstel van ‘n koördineerder om hulp aan skole te verskaf. Die belangrikste uitkomste van die studie was die besef dat opvoeders se vrese en aannames aangespreek moet word om ‘n gehaltebestuurstelsel effektief te maak. Slypskole moet gehou word om hulp en bystand aan die getakseerdes te verleen. Die bestuurspan van die skool moet ook indiensopleiding ondergaan, sodat hulle presies kan weet wat van hulle verwag word. Op hierdie manier word onsekerhede uit die weg geruim, want onsekerheid was die grootste probleem waarmee opvoeders te kampe gehad het in die implimentering van die GGBS.
- Full Text:
- Date Issued: 2007
- Authors: James, Raymond Oscar
- Date: 2007
- Subjects: Total quality management -- South Africa , Quality assurance -- South Africa
- Language: Afrikaans
- Type: Thesis , Masters , MEd
- Identifier: vital:9540 , http://hdl.handle.net/10948/682 , Total quality management -- South Africa , Quality assurance -- South Africa
- Description: Die doel van hierdie studie was om te kyk hoe effektief die Geïntegreerde Gehaltebestuurstelsel (GGBS), en wel die taksering van opvoeders, bestuur kan word om positiewe resultate by skole te bereik. Die studie is gedoen binne die Interpretivistiese benadering. Data-invordering is gedoen deur middel van vraelyste, observasie en onderhoude. Die studie het getoon dat opvoeders onseker was, juis omdat die Onderwysdepartement nie die nodige leiding gegee en die nodige hulpbronne gehad het nie. Die afgelope twee jaar ( 2006 en 2007 ) egter het die Departement skouer aan die wiel gesit en hulp aan skole verleen, hetsy deur die beskikbaarstelling van die nodige vorms, of die aanstel van ‘n koördineerder om hulp aan skole te verskaf. Die belangrikste uitkomste van die studie was die besef dat opvoeders se vrese en aannames aangespreek moet word om ‘n gehaltebestuurstelsel effektief te maak. Slypskole moet gehou word om hulp en bystand aan die getakseerdes te verleen. Die bestuurspan van die skool moet ook indiensopleiding ondergaan, sodat hulle presies kan weet wat van hulle verwag word. Op hierdie manier word onsekerhede uit die weg geruim, want onsekerheid was die grootste probleem waarmee opvoeders te kampe gehad het in die implimentering van die GGBS.
- Full Text:
- Date Issued: 2007
Die verbetering van dissipline as 'n sleutelbestuurstaak in 'n skool
- Authors: September, Willie Jeffrie
- Date: 2007
- Subjects: Classroom management -- South Africa , School discipline -- South Africa , School management teams
- Language: Afrikaans
- Type: Thesis , Masters , MEd
- Identifier: vital:9542 , http://hdl.handle.net/10948/679 , Classroom management -- South Africa , School discipline -- South Africa , School management teams
- Description: Die doel van hierdie studie is om die dissiplinêre probleme in skole soos dit in die Oudtshoorn-omgewing voorkom, te identifiseer en aan te spreek. Dit word gedoen deur te let op: • die skoolklimaat wat by 'n skool heers en die uitwerking van die skoolklimaat op die dissipline van`n skool. • die dissiplinêre probleme wat met skooldissipline in skole ervaar word. • die oorsake van skooldissipline en in watter mate die omgewing waarin die skool geleë is 'n invloed op skooldissipline het en • om oplossings vir dissiplinêre probleme soos vasgestel aan die hand te doen. Die studie poog om deur kwalitatiewe navorsingsmetodes vas te stel hoe prinsipale, opvoeders en leerders die huidige dissiplinêre situasie in skole ervaar. Dit poog dus om eerstehandse kennis te verkry van hul denke, gevoelens en gedagtes en hoe hierdie fenomeen hulle beïnvloed. Die studie kyk ook in watter mate skoolklimaat op die breë spektrum van skooldissipline 'n invloed het, en hoe die verbetering van skooldissipline `n sleutelbestuurstaak in 'n skool is. Die belangrikste bevindinge van die studie is dat daar samewerking tussen opvoeders en ouers moet wees om negatiewe leerdergedrag aan te spreek. Die studie dui ook aan dat kommunikasie tussen alle rolspelers van uiterse belang is om die dissiplinêre probleme binne skole aan bande te lê. Skoolleierskap moet hulle ook vergewis van die jongste metodes om dissiplinêre probleme aan te spreek. 'n Positiewe skoolklimaat of kultuur is ondersteunend om skooldissipline te verbeter.
- Full Text:
- Date Issued: 2007
- Authors: September, Willie Jeffrie
- Date: 2007
- Subjects: Classroom management -- South Africa , School discipline -- South Africa , School management teams
- Language: Afrikaans
- Type: Thesis , Masters , MEd
- Identifier: vital:9542 , http://hdl.handle.net/10948/679 , Classroom management -- South Africa , School discipline -- South Africa , School management teams
- Description: Die doel van hierdie studie is om die dissiplinêre probleme in skole soos dit in die Oudtshoorn-omgewing voorkom, te identifiseer en aan te spreek. Dit word gedoen deur te let op: • die skoolklimaat wat by 'n skool heers en die uitwerking van die skoolklimaat op die dissipline van`n skool. • die dissiplinêre probleme wat met skooldissipline in skole ervaar word. • die oorsake van skooldissipline en in watter mate die omgewing waarin die skool geleë is 'n invloed op skooldissipline het en • om oplossings vir dissiplinêre probleme soos vasgestel aan die hand te doen. Die studie poog om deur kwalitatiewe navorsingsmetodes vas te stel hoe prinsipale, opvoeders en leerders die huidige dissiplinêre situasie in skole ervaar. Dit poog dus om eerstehandse kennis te verkry van hul denke, gevoelens en gedagtes en hoe hierdie fenomeen hulle beïnvloed. Die studie kyk ook in watter mate skoolklimaat op die breë spektrum van skooldissipline 'n invloed het, en hoe die verbetering van skooldissipline `n sleutelbestuurstaak in 'n skool is. Die belangrikste bevindinge van die studie is dat daar samewerking tussen opvoeders en ouers moet wees om negatiewe leerdergedrag aan te spreek. Die studie dui ook aan dat kommunikasie tussen alle rolspelers van uiterse belang is om die dissiplinêre probleme binne skole aan bande te lê. Skoolleierskap moet hulle ook vergewis van die jongste metodes om dissiplinêre probleme aan te spreek. 'n Positiewe skoolklimaat of kultuur is ondersteunend om skooldissipline te verbeter.
- Full Text:
- Date Issued: 2007
Education decentralization in the Omaheke Region of Namibia
- Authors: Semba, Pecka
- Date: 2007
- Subjects: Education -- Namibia Schools -- Decentralization -- Namibia Education and state -- Namibia Educational change -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1894 , http://hdl.handle.net/10962/d1006114
- Description: Before the attainment of independence on 21 March 1990, the people of Namibia were engaged in a protracted struggle against colonialism, racism and apartheid, all of which had denied the majority of the people democracy and development. The people of Namibia therefore did not have power to make decisions on matters that affect their lives and were also not able to determine their own destiny (Ministry of Regional Government and Housing [MoRGH]: 1998:1). After independence, the Namibian government provided for a policy of decentralization under Chapter 12 of the Constitution. After adopting decentralization as state policy in 1996 the government, under the auspices of the Ministry of Regional, Local Government and Housing, embarked upon an implementation process that began in 2003. Education decentralization was included in this process. As my research investigated participants' experience of education decentralization in the Omaheke Region, I conducted an interpretive case study. I employed semi-structured interviews as my main data collection instrument. The quality of my research lies mostly in the authenticity of my thick descriptions where I rely to a large degree on a high ratio of participant to researcher voice. The study has revealed that there is a basic understanding of what education decentralization refers to. Education decentralization is also perceived to provide for the democratization of education through the active participation of all relevant stakeholders - parents, teachers, learners and civil servants - in the education process. However, although there is a basic understanding of what education decentralization entails, there is not necessarily acceptance. The study revealed that many people in Omaheke have reservations about the process of decentralizing education services. Some regard education decentralization as central government "dumping" its responsibility on the Regions. Furthermore, neither the Regional Council, the Regional Education Office, schools, communities nor parents have the capacity to cope with decentralization. The responsibility for overseeing the implementation of decentralization in the Region lies with the Omaheke Regional Council. Education as a decentralized function ought to resort directly under the Regional Council. However, the Regional Education office does not yet operate under the Regional Council. Instead the Education Director continues to report directly to the Permanent Secretary of the Ministry of Education in the capital. In this way an important decentralization structure, the Regional Council, is bypassed and rendered toothless. The data reveal that there is only partial evidence of psychological and structural readiness for education decentralization. Consequently there is little meaningful participation and therefore no sense of ownership among parents, teachers, learners, community-based organizations and political leaders.
- Full Text:
- Date Issued: 2007
- Authors: Semba, Pecka
- Date: 2007
- Subjects: Education -- Namibia Schools -- Decentralization -- Namibia Education and state -- Namibia Educational change -- Namibia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1894 , http://hdl.handle.net/10962/d1006114
- Description: Before the attainment of independence on 21 March 1990, the people of Namibia were engaged in a protracted struggle against colonialism, racism and apartheid, all of which had denied the majority of the people democracy and development. The people of Namibia therefore did not have power to make decisions on matters that affect their lives and were also not able to determine their own destiny (Ministry of Regional Government and Housing [MoRGH]: 1998:1). After independence, the Namibian government provided for a policy of decentralization under Chapter 12 of the Constitution. After adopting decentralization as state policy in 1996 the government, under the auspices of the Ministry of Regional, Local Government and Housing, embarked upon an implementation process that began in 2003. Education decentralization was included in this process. As my research investigated participants' experience of education decentralization in the Omaheke Region, I conducted an interpretive case study. I employed semi-structured interviews as my main data collection instrument. The quality of my research lies mostly in the authenticity of my thick descriptions where I rely to a large degree on a high ratio of participant to researcher voice. The study has revealed that there is a basic understanding of what education decentralization refers to. Education decentralization is also perceived to provide for the democratization of education through the active participation of all relevant stakeholders - parents, teachers, learners and civil servants - in the education process. However, although there is a basic understanding of what education decentralization entails, there is not necessarily acceptance. The study revealed that many people in Omaheke have reservations about the process of decentralizing education services. Some regard education decentralization as central government "dumping" its responsibility on the Regions. Furthermore, neither the Regional Council, the Regional Education Office, schools, communities nor parents have the capacity to cope with decentralization. The responsibility for overseeing the implementation of decentralization in the Region lies with the Omaheke Regional Council. Education as a decentralized function ought to resort directly under the Regional Council. However, the Regional Education office does not yet operate under the Regional Council. Instead the Education Director continues to report directly to the Permanent Secretary of the Ministry of Education in the capital. In this way an important decentralization structure, the Regional Council, is bypassed and rendered toothless. The data reveal that there is only partial evidence of psychological and structural readiness for education decentralization. Consequently there is little meaningful participation and therefore no sense of ownership among parents, teachers, learners, community-based organizations and political leaders.
- Full Text:
- Date Issued: 2007
Effectiveness of the basic antenatal care package in primary health care clinics
- Authors: Snyman, J S
- Date: 2007
- Subjects: Pregnant women -- Health and hygiene , Hospitals -- Maternity services -- South Africa -- Port Elizabeth -- Evaluation , Maternal health services
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: vital:10037 , http://hdl.handle.net/10948/728 , Pregnant women -- Health and hygiene , Hospitals -- Maternity services -- South Africa -- Port Elizabeth -- Evaluation , Maternal health services
- Description: Pregnancy challenges the health care system in a unique way in that it involves at least two individuals – the woman and the fetus. The death rates of both pregnant women (maternal mortality) and newborns (perinatal mortality) are often used to indicate the quality of care the health system is providing. In terms of maternal and perinatal outcomes South Africa scores poorly compared to other upper-middle income countries (Penn-Kekana & Blaauw, 2002:14). The high stillbirth rate compared to the neonatal death rate reflects poor quality of antenatal care. Maternal and perinatal mortality is recognised as a problem and as a priority for action in the Millennium Development Goals (Thieren & Beusenberg, 2005:11). The Saving Mothers (Pattinson, 2002: 37-135) and Saving Babies (Pattinson, 2004:4-35) reports describe the causes and avoidable factors of these deaths with recommendations on how to improve care. The quality of care during the antenatal period may impact on the health of the pregnant woman and the outcome of the pregnancy, in particular on the still birth rate. In primary health care services there are many factors which may impact on and influence the quality of antenatal care. For example with the implementation of the comprehensive primary health care services package (Department of Health, 2001a:21-35) changes at clinic level resulted in a large number of primary health care professional nurses having to provide antenatal care, who previously may only have worked with one aspect of the primary health care package such as minor ailments or childcare. Because skills of midwifery or antenatal care, had not been practiced by some of these professional nurses, perhaps since completion of basic training, their level of competence has declined, and they have not been exposed to new developments in the field of midwifery. The practice of primary health care nurses is also influenced by the impact of diseases not specifically related to pregnancy like HIV/AIDS and tuberculosis. The principles of quality antenatal care are known (Chalmers et al. 2001:203) but despite the knowledge about these principles the maternal and perinatal mortality remains high. The Basic Antenatal Care quality improvement package is designed to assist clinical management and decision making in antenatal care. The implementation of the BANC package may influence the quality of antenatal care positively, which in turn may impact on the outcome of pregnancy for the mother and her baby. The aim of this study was to evaluate the effectiveness of the Basic antenatal care (BANC) package to improve the quality of antenatal care at primary health care clinics.
- Full Text:
- Date Issued: 2007
- Authors: Snyman, J S
- Date: 2007
- Subjects: Pregnant women -- Health and hygiene , Hospitals -- Maternity services -- South Africa -- Port Elizabeth -- Evaluation , Maternal health services
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: vital:10037 , http://hdl.handle.net/10948/728 , Pregnant women -- Health and hygiene , Hospitals -- Maternity services -- South Africa -- Port Elizabeth -- Evaluation , Maternal health services
- Description: Pregnancy challenges the health care system in a unique way in that it involves at least two individuals – the woman and the fetus. The death rates of both pregnant women (maternal mortality) and newborns (perinatal mortality) are often used to indicate the quality of care the health system is providing. In terms of maternal and perinatal outcomes South Africa scores poorly compared to other upper-middle income countries (Penn-Kekana & Blaauw, 2002:14). The high stillbirth rate compared to the neonatal death rate reflects poor quality of antenatal care. Maternal and perinatal mortality is recognised as a problem and as a priority for action in the Millennium Development Goals (Thieren & Beusenberg, 2005:11). The Saving Mothers (Pattinson, 2002: 37-135) and Saving Babies (Pattinson, 2004:4-35) reports describe the causes and avoidable factors of these deaths with recommendations on how to improve care. The quality of care during the antenatal period may impact on the health of the pregnant woman and the outcome of the pregnancy, in particular on the still birth rate. In primary health care services there are many factors which may impact on and influence the quality of antenatal care. For example with the implementation of the comprehensive primary health care services package (Department of Health, 2001a:21-35) changes at clinic level resulted in a large number of primary health care professional nurses having to provide antenatal care, who previously may only have worked with one aspect of the primary health care package such as minor ailments or childcare. Because skills of midwifery or antenatal care, had not been practiced by some of these professional nurses, perhaps since completion of basic training, their level of competence has declined, and they have not been exposed to new developments in the field of midwifery. The practice of primary health care nurses is also influenced by the impact of diseases not specifically related to pregnancy like HIV/AIDS and tuberculosis. The principles of quality antenatal care are known (Chalmers et al. 2001:203) but despite the knowledge about these principles the maternal and perinatal mortality remains high. The Basic Antenatal Care quality improvement package is designed to assist clinical management and decision making in antenatal care. The implementation of the BANC package may influence the quality of antenatal care positively, which in turn may impact on the outcome of pregnancy for the mother and her baby. The aim of this study was to evaluate the effectiveness of the Basic antenatal care (BANC) package to improve the quality of antenatal care at primary health care clinics.
- Full Text:
- Date Issued: 2007
Elephant feeding behaviour and forage offtake implications in the Addo Elephant National Park
- Authors: Lessing, Joan Susanna
- Date: 2007
- Subjects: Elephants -- South Africa -- Addo Elephant National Park , Elephants -- Behavior , Addo Elephant National Park (South Africa) , Mammals -- Behavior
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10712 , http://hdl.handle.net/10948/542 , http://hdl.handle.net/10948/d1012016 , Elephants -- South Africa -- Addo Elephant National Park , Elephants -- Behavior , Addo Elephant National Park (South Africa) , Mammals -- Behavior
- Description: Elephants, as megaherbivores and keystone species have major impacts, both positive and negative, on ecosystems such as the Subtropical Thicket of the Eastern Cape. The feeding behaviour of elephants was quantified so as to firstly determine the preferred feeding heights of elephants, and secondly to determine if feeding behaviour and impact varies with size and sex. The preferred feeding height was determined with experimental feeding trials. Feeding height, pluck size, foraging rate and the proportion of plant material discarded were used to test for differences between elephants of different sizes and sexes in the Addo Elephant National Park. The influence of plant growth form on sex-specific feeding was also considered. Elephants preferred to feed at the lowest heights. The preferred feeding height was not related to body size. A wide range of feeding heights was recorded including and extending beyond, both the preferred and maximum feeding height of co-existing indigenous browsers. There was no difference in feeding height between the sizes and sexes. In free ranging conditions, all elephants fed at levels above the preferred foraging height when browsing. There was no difference in feeding behaviour between the different sized elephants, or between males and females. Adult elephants however exhibited larger ranges of feeding heights, pluck sizes, foraging rates and intake rates, including the maximum and minimum values. Growth form influenced the feeding of male and female elephants differently. Elephant feeding behaviour appears to limit opportunities for resource partitioning by way of feeding height segregation. Elephants are also capable of dominating the browse resources available to co-existing browsers by removing large amounts of forage at lower heights. The extent of elephant impact seems to be comparable between sizes and sexes, although adults and especially larger males are often able to use foraging opportunities that other elephants can not effectively utilize. Findings suggest that the feeding heights of elephants are determined by forage availability and reflect the diet in terms of browse or grass. The findings can be used, together with browse inventory methods, to determine browse resources available to elephants, and can also be used to develop monitoring tools to assess the impacts of elephants on plants.
- Full Text:
- Date Issued: 2007
- Authors: Lessing, Joan Susanna
- Date: 2007
- Subjects: Elephants -- South Africa -- Addo Elephant National Park , Elephants -- Behavior , Addo Elephant National Park (South Africa) , Mammals -- Behavior
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10712 , http://hdl.handle.net/10948/542 , http://hdl.handle.net/10948/d1012016 , Elephants -- South Africa -- Addo Elephant National Park , Elephants -- Behavior , Addo Elephant National Park (South Africa) , Mammals -- Behavior
- Description: Elephants, as megaherbivores and keystone species have major impacts, both positive and negative, on ecosystems such as the Subtropical Thicket of the Eastern Cape. The feeding behaviour of elephants was quantified so as to firstly determine the preferred feeding heights of elephants, and secondly to determine if feeding behaviour and impact varies with size and sex. The preferred feeding height was determined with experimental feeding trials. Feeding height, pluck size, foraging rate and the proportion of plant material discarded were used to test for differences between elephants of different sizes and sexes in the Addo Elephant National Park. The influence of plant growth form on sex-specific feeding was also considered. Elephants preferred to feed at the lowest heights. The preferred feeding height was not related to body size. A wide range of feeding heights was recorded including and extending beyond, both the preferred and maximum feeding height of co-existing indigenous browsers. There was no difference in feeding height between the sizes and sexes. In free ranging conditions, all elephants fed at levels above the preferred foraging height when browsing. There was no difference in feeding behaviour between the different sized elephants, or between males and females. Adult elephants however exhibited larger ranges of feeding heights, pluck sizes, foraging rates and intake rates, including the maximum and minimum values. Growth form influenced the feeding of male and female elephants differently. Elephant feeding behaviour appears to limit opportunities for resource partitioning by way of feeding height segregation. Elephants are also capable of dominating the browse resources available to co-existing browsers by removing large amounts of forage at lower heights. The extent of elephant impact seems to be comparable between sizes and sexes, although adults and especially larger males are often able to use foraging opportunities that other elephants can not effectively utilize. Findings suggest that the feeding heights of elephants are determined by forage availability and reflect the diet in terms of browse or grass. The findings can be used, together with browse inventory methods, to determine browse resources available to elephants, and can also be used to develop monitoring tools to assess the impacts of elephants on plants.
- Full Text:
- Date Issued: 2007
Eluvial chromite resources of the Great Dyke of Zimbabwe
- Authors: Musa, Caston Tamburayi
- Date: 2007
- Subjects: Dikes (Geology) -- Zimbabwe Chromite -- Zimbabwe Geology -- Zimbabwe Olivine Serpentinite Eluvium
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5046 , http://hdl.handle.net/10962/d1007731
- Description: Apart from the concentrations of chromite in layers within the Great Dyke and other ultramafic complexes, chromite also occurs as interstitial grains throughout the olivine-bearing rock-types. These olivine-bearing rocks include no rites, gabbros, dunites and pyroxenites. Chromite concentration in these rocks varies from 0.48 to 3.09 per cent of the rock, usually in the form of chromite (Ahrens, 1965; Worst, 1960). A small fraction of this chromite settled to form chromitite layers whilst the remainder is retained within the rock mass as finely disseminated chromite and chromite interstitial to olivine. This retained chromite is much finer grained than layer chromite and is the primary source of eluvial chromite (Cotterill, 1981). During weathering of the serpentine rock and transportation by rainwater, the heavier chromite and magnetite grains are re-deposited along watercourses and vleis or valleys as the speed of the water is retarded sufficiently for the heavier particles to settle. The lighter serpentine material is removed and the chromite concentration in the soil is increased, thus resulting in eluvial chromite (Keech et ai, 1961; Worst, 1960; Prendergast, 1978). The concentration of chromite particles in soil can be up to 15 (or more) Cr₂O₃ %, resulting in economic and exploitable deposits, located primarily along the Great Dyke fiacks. A preliminary evaluation of the eluvials indicate that the Great Dyke could be host to up to 10 million tonnes of potential chromite concentrates which could be processed from such eluvial concentrates. These chromite-rich soils can be mined more cheaply than the traditional seams mining and processed into chromite concentrates through simple mechanical processing techniques of spirals, jigs and heavy media separators. The resultant chromite concentrates are of high quality and can be used to manufacture chromite ore briquettes, which are an alternative to lumpy chromite smelter feed. The main challenges to eluvial mining are the inevitable environmental degradation and coming up with methods that could possibly mitigate against such environmental damage. The distribution of these eluvials over vast plains as thin soil horizons, necessitate use of mobile concentrator plants and hence establishment of extensive infrastructure. These challenges, however, are not insurmountable and test mining and previous production runs have proved profitable. The eluvials are also associated with some lateritic nickel concentrations. The nickel occurs in close association with some oxide such as goethite and garnierite and is associated with iron-manganiferous soil pisolites. The analyses of these pisolites indicate high nickel grades of generally above 1.00 %Ni. Such high nickel-content of Great Dyke laterites warrant, further investigations.
- Full Text:
- Date Issued: 2007
- Authors: Musa, Caston Tamburayi
- Date: 2007
- Subjects: Dikes (Geology) -- Zimbabwe Chromite -- Zimbabwe Geology -- Zimbabwe Olivine Serpentinite Eluvium
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5046 , http://hdl.handle.net/10962/d1007731
- Description: Apart from the concentrations of chromite in layers within the Great Dyke and other ultramafic complexes, chromite also occurs as interstitial grains throughout the olivine-bearing rock-types. These olivine-bearing rocks include no rites, gabbros, dunites and pyroxenites. Chromite concentration in these rocks varies from 0.48 to 3.09 per cent of the rock, usually in the form of chromite (Ahrens, 1965; Worst, 1960). A small fraction of this chromite settled to form chromitite layers whilst the remainder is retained within the rock mass as finely disseminated chromite and chromite interstitial to olivine. This retained chromite is much finer grained than layer chromite and is the primary source of eluvial chromite (Cotterill, 1981). During weathering of the serpentine rock and transportation by rainwater, the heavier chromite and magnetite grains are re-deposited along watercourses and vleis or valleys as the speed of the water is retarded sufficiently for the heavier particles to settle. The lighter serpentine material is removed and the chromite concentration in the soil is increased, thus resulting in eluvial chromite (Keech et ai, 1961; Worst, 1960; Prendergast, 1978). The concentration of chromite particles in soil can be up to 15 (or more) Cr₂O₃ %, resulting in economic and exploitable deposits, located primarily along the Great Dyke fiacks. A preliminary evaluation of the eluvials indicate that the Great Dyke could be host to up to 10 million tonnes of potential chromite concentrates which could be processed from such eluvial concentrates. These chromite-rich soils can be mined more cheaply than the traditional seams mining and processed into chromite concentrates through simple mechanical processing techniques of spirals, jigs and heavy media separators. The resultant chromite concentrates are of high quality and can be used to manufacture chromite ore briquettes, which are an alternative to lumpy chromite smelter feed. The main challenges to eluvial mining are the inevitable environmental degradation and coming up with methods that could possibly mitigate against such environmental damage. The distribution of these eluvials over vast plains as thin soil horizons, necessitate use of mobile concentrator plants and hence establishment of extensive infrastructure. These challenges, however, are not insurmountable and test mining and previous production runs have proved profitable. The eluvials are also associated with some lateritic nickel concentrations. The nickel occurs in close association with some oxide such as goethite and garnierite and is associated with iron-manganiferous soil pisolites. The analyses of these pisolites indicate high nickel grades of generally above 1.00 %Ni. Such high nickel-content of Great Dyke laterites warrant, further investigations.
- Full Text:
- Date Issued: 2007
Emotional intelligence and effective team functioning of MBA syndicate groups at the NMMU business school
- Authors: Doolabh, Chetna Gidhar
- Date: 2007
- Subjects: Emotional intelligence , Interpersonal relations , Teams in the workplace , Nelson Mandela Metropolitan University. Business School
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8747 , http://hdl.handle.net/10948/740 , Emotional intelligence , Interpersonal relations , Teams in the workplace , Nelson Mandela Metropolitan University. Business School
- Description: A common issue in leadership development is the high flyers who reach a position where their lack of “soft” skills hampers their performance and proves a barrier to their continued progression to higher levels of responsibility (Newell, 2002: 288). Business Schools offering Masters in Business Administration (MBA) programmes assist in developing managers with not just managerial competence but also with “soft” skills. By delivering educated business managers, these managers through their intellectual skills and community sensitive values, will lead future transformational processes. It is useful and interesting to consider how important emotional intelligence is for effective performance at work. A considerable body of research suggests that an employee’s ability to perceive, identify, and manage emotion provides the basis for the kinds of social and emotional competencies that are important for success in almost any position. Furthermore, as the pace of change increases and the world of work make ever-greater demands on an employee’s cognitive, emotional, and physical resources, this particular set of abilities will become increasingly important (Cherniss, 2000). The primary objective of this study is to determine the perceptions of the Masters in Business Administration (MBA), B-Tech in Business Administration (BBA), Advanced Business Programme (ABP) programmes and the Business School Alumni to determine the overall emotional intelligence profile of students as well as the effective team functions of the syndicate groups. Based on the main findings of the survey, it was concluded that emotional intelligence is an important factor for the NMMU Business School, MBA Unit students. The skills attained through the course work will not only improve team effectiveness in the syndicate group functioning but also enhance their performance in the business environment. The MBA team learning experiences enhances workplace learning as the ability to work in a team and ability to think and act independently are highly desired skills and competencies for success in the workplace.
- Full Text:
- Date Issued: 2007
- Authors: Doolabh, Chetna Gidhar
- Date: 2007
- Subjects: Emotional intelligence , Interpersonal relations , Teams in the workplace , Nelson Mandela Metropolitan University. Business School
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8747 , http://hdl.handle.net/10948/740 , Emotional intelligence , Interpersonal relations , Teams in the workplace , Nelson Mandela Metropolitan University. Business School
- Description: A common issue in leadership development is the high flyers who reach a position where their lack of “soft” skills hampers their performance and proves a barrier to their continued progression to higher levels of responsibility (Newell, 2002: 288). Business Schools offering Masters in Business Administration (MBA) programmes assist in developing managers with not just managerial competence but also with “soft” skills. By delivering educated business managers, these managers through their intellectual skills and community sensitive values, will lead future transformational processes. It is useful and interesting to consider how important emotional intelligence is for effective performance at work. A considerable body of research suggests that an employee’s ability to perceive, identify, and manage emotion provides the basis for the kinds of social and emotional competencies that are important for success in almost any position. Furthermore, as the pace of change increases and the world of work make ever-greater demands on an employee’s cognitive, emotional, and physical resources, this particular set of abilities will become increasingly important (Cherniss, 2000). The primary objective of this study is to determine the perceptions of the Masters in Business Administration (MBA), B-Tech in Business Administration (BBA), Advanced Business Programme (ABP) programmes and the Business School Alumni to determine the overall emotional intelligence profile of students as well as the effective team functions of the syndicate groups. Based on the main findings of the survey, it was concluded that emotional intelligence is an important factor for the NMMU Business School, MBA Unit students. The skills attained through the course work will not only improve team effectiveness in the syndicate group functioning but also enhance their performance in the business environment. The MBA team learning experiences enhances workplace learning as the ability to work in a team and ability to think and act independently are highly desired skills and competencies for success in the workplace.
- Full Text:
- Date Issued: 2007
Endozoochory in the subtropical thicket: comparing effects of species with different digestive systems on seed fate
- Authors: Davis, Shavaughn
- Date: 2007
- Subjects: Seeds -- Dispersal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10714 , http://hdl.handle.net/10948/494 , http://hdl.handle.net/10948/d1012018 , Seeds -- Dispersal
- Description: Endozoochory is an important form of seed dispersal and as such plays a fundamental role in plant population and community ecology. This is especially true in the Subtropical Thicket biome where many plant species are adapted for endozoochory. Endozoochorous seed dispersal is carried out by a wide range of thicket fauna, but changes in the faunal assemblage associated with transformed thicket threatens to disrupt the process of endozoochorous seed dispersal and in turn the regeneration dynamics of thicket plants. Outside of conservation areas, indigenous seed dispersers are often replaced by domestic species, such as goats, which are hypothesized to differ in their seed dispersal efficiencies. The dispersal efficiencies of important thicket seed dispersers that occur in transformed and untransformed thicket were therefore investigated. The influence of gut morphologyphysiology on seed gut passage time, seed mortality and germination in animal species representing different digestive models was measured, as well as the role of black-backed jackal in thicket plant seed dispersal. Black-backed jackal were found to disperse the seeds of few thicket plant species and are therefore not considered important thicket seed dispersers under the climatic conditions prevailing during the study. The average gut passage time of seeds was found to differ significantly between birds and mammals, but not between elephants (hindgut fermentor), goats (ruminant) and pigs (omnivore, foregut fermentor) as was expected considering the differences in their digestive morphology. A significantly shorter gut passage of large seeds compared with small seeds was observed in goats, due to the regurgitation of larger seeds. Seed regurgitation in ruminants may prove to be an important factor contributing to their quality as seed dispersers in transformed thicket. The mortality of seeds was significantly higher in goats than in elephants, probably due to the efficient digestion associated with ruminants. The effect of gut passage on seed germination was not consistent and varied between animal species and across different thicket plant species. It was concluded that seed dispersers that occur in transformed and untransformed thicket differ in their seed dispersal efficiency due, in part, to differences in the nature of their digestive tracts. This has important implications for the process of seed dispersal in thicket, and the rehabilitation of degraded thicket vegetation.
- Full Text:
- Date Issued: 2007
- Authors: Davis, Shavaughn
- Date: 2007
- Subjects: Seeds -- Dispersal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10714 , http://hdl.handle.net/10948/494 , http://hdl.handle.net/10948/d1012018 , Seeds -- Dispersal
- Description: Endozoochory is an important form of seed dispersal and as such plays a fundamental role in plant population and community ecology. This is especially true in the Subtropical Thicket biome where many plant species are adapted for endozoochory. Endozoochorous seed dispersal is carried out by a wide range of thicket fauna, but changes in the faunal assemblage associated with transformed thicket threatens to disrupt the process of endozoochorous seed dispersal and in turn the regeneration dynamics of thicket plants. Outside of conservation areas, indigenous seed dispersers are often replaced by domestic species, such as goats, which are hypothesized to differ in their seed dispersal efficiencies. The dispersal efficiencies of important thicket seed dispersers that occur in transformed and untransformed thicket were therefore investigated. The influence of gut morphologyphysiology on seed gut passage time, seed mortality and germination in animal species representing different digestive models was measured, as well as the role of black-backed jackal in thicket plant seed dispersal. Black-backed jackal were found to disperse the seeds of few thicket plant species and are therefore not considered important thicket seed dispersers under the climatic conditions prevailing during the study. The average gut passage time of seeds was found to differ significantly between birds and mammals, but not between elephants (hindgut fermentor), goats (ruminant) and pigs (omnivore, foregut fermentor) as was expected considering the differences in their digestive morphology. A significantly shorter gut passage of large seeds compared with small seeds was observed in goats, due to the regurgitation of larger seeds. Seed regurgitation in ruminants may prove to be an important factor contributing to their quality as seed dispersers in transformed thicket. The mortality of seeds was significantly higher in goats than in elephants, probably due to the efficient digestion associated with ruminants. The effect of gut passage on seed germination was not consistent and varied between animal species and across different thicket plant species. It was concluded that seed dispersers that occur in transformed and untransformed thicket differ in their seed dispersal efficiency due, in part, to differences in the nature of their digestive tracts. This has important implications for the process of seed dispersal in thicket, and the rehabilitation of degraded thicket vegetation.
- Full Text:
- Date Issued: 2007
Engaging employees to build a performance culture in Telkom's NCC division
- Authors: Goliath, Elize
- Date: 2007
- Subjects: Performance -- Management , Quality assurance -- Management , Organizational effectiveness , Telkom (Firm : South Africa)
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8591 , http://hdl.handle.net/10948/1051 , Performance -- Management , Quality assurance -- Management , Organizational effectiveness , Telkom (Firm : South Africa)
- Description: Operating as a commercial company since October 1991, Telkom has grown into the largest communications services provider in Africa based on operating revenue and assets. The Group, consisting of the fixed-line company Telkom and a 50 per cent shareholding in mobile operator Vodacom. Telkom has changed its vision to the following: “To be a leading customer and employee centric ICT solutions service provider”. The company has been retrenching staff since 1999 and the staff numbers have reduced significantly from approximately 65 000 people to 25 575 people in 2006. The focus has been on increasing shareholder value and the staff feel that their value has not been recognised. The research paper focused on the extent that employees engaged to build a performance culture in Telkom’s NCC division. The following research methodology was followed: - A literature survey to determine factors or behaviours that will enhance employee engagement in building a performance culture and what Telkom NCC can do to build the workplace that will foster higher levels of employee engagement. - A survey was conducted to determine what the engagement levels of employees are at Telkom NCC, what stops the employees from doing their best and what Telkom NCC division can do to show they care and value their staff as according to their employees by means of a questionnaire. - The findings from the literature study and empirical study would be used to determine to what extent are employees engaged to build a performance culture in Telkom’s NCC division. A self administered questionnaire was used to collect the data required for this research. In conclusion it was said that employee engagement is a partnership between the company and the employees where everyone works together to achieve the business objectives of the company and the personal aspirations of employees. The organization has the responsibility to create the conditions for this to happen (Understanding Employee Engagement, 2004: 2). It was recommended that in order for NCC to enhance their employees attitudes toward the promoters’ team especially in terms of pride, strong attachment, feeling part of the family and motivating employees to do well promoters must concentrate on building relationships with their teams and individual members of the team. Employees must also be given decision making power for implementing the idea. NCC should educate their leaders on the value of recognition and the best way to go about it. In order for employees to grow and be promoted into higher positions, NCC must consider that if positions become available that they first be advertised in the NCC division before it be made available to the rest of the company.
- Full Text:
- Date Issued: 2007
- Authors: Goliath, Elize
- Date: 2007
- Subjects: Performance -- Management , Quality assurance -- Management , Organizational effectiveness , Telkom (Firm : South Africa)
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8591 , http://hdl.handle.net/10948/1051 , Performance -- Management , Quality assurance -- Management , Organizational effectiveness , Telkom (Firm : South Africa)
- Description: Operating as a commercial company since October 1991, Telkom has grown into the largest communications services provider in Africa based on operating revenue and assets. The Group, consisting of the fixed-line company Telkom and a 50 per cent shareholding in mobile operator Vodacom. Telkom has changed its vision to the following: “To be a leading customer and employee centric ICT solutions service provider”. The company has been retrenching staff since 1999 and the staff numbers have reduced significantly from approximately 65 000 people to 25 575 people in 2006. The focus has been on increasing shareholder value and the staff feel that their value has not been recognised. The research paper focused on the extent that employees engaged to build a performance culture in Telkom’s NCC division. The following research methodology was followed: - A literature survey to determine factors or behaviours that will enhance employee engagement in building a performance culture and what Telkom NCC can do to build the workplace that will foster higher levels of employee engagement. - A survey was conducted to determine what the engagement levels of employees are at Telkom NCC, what stops the employees from doing their best and what Telkom NCC division can do to show they care and value their staff as according to their employees by means of a questionnaire. - The findings from the literature study and empirical study would be used to determine to what extent are employees engaged to build a performance culture in Telkom’s NCC division. A self administered questionnaire was used to collect the data required for this research. In conclusion it was said that employee engagement is a partnership between the company and the employees where everyone works together to achieve the business objectives of the company and the personal aspirations of employees. The organization has the responsibility to create the conditions for this to happen (Understanding Employee Engagement, 2004: 2). It was recommended that in order for NCC to enhance their employees attitudes toward the promoters’ team especially in terms of pride, strong attachment, feeling part of the family and motivating employees to do well promoters must concentrate on building relationships with their teams and individual members of the team. Employees must also be given decision making power for implementing the idea. NCC should educate their leaders on the value of recognition and the best way to go about it. In order for employees to grow and be promoted into higher positions, NCC must consider that if positions become available that they first be advertised in the NCC division before it be made available to the rest of the company.
- Full Text:
- Date Issued: 2007
Enhancing phosphorus availability in some phosphate fixing soils of the Transkei region, South Africa using goat manure
- Authors: Gichangi, Elias Maina
- Date: 2007
- Subjects: Phosphorus in agriculture , Soils -- Phosphorus content , Phosphatic fertilizers , Soils -- Phosphorus content -- South Africa -- Transkei
- Language: English
- Type: Thesis , Doctoral , PhD (Soil Science)
- Identifier: vital:11960 , http://hdl.handle.net/10353/80 , Phosphorus in agriculture , Soils -- Phosphorus content , Phosphatic fertilizers , Soils -- Phosphorus content -- South Africa -- Transkei
- Description: Low availability of soil phosphorus (P) caused by strong sorption of P is a major constraint to agricultural production in most South African soils, particularly those from the high rainfall areas. The aim of this study was therefore to investigate whether combined addition of goat manure with inorganic P fertilizers could enhance P availability in some P fixing soils of the Transkei region, South Africa. The study addressed the following specific objectives (i) to assess P sorption capacities and requirements of selected soils and their relationship with selected soil properties and single point sorption test, (ii) to assess the effects of goat manure and lime addition on P sorption properties of selected P fixing soils (iii) to assess the temporal changes in concentration of inorganic and microbial biomass P fractions following application of inorganic fertilizer P with goat manure in a laboratory incubation experiment, and, (iv) to assess the effects of goat manure application with inorganic phosphate on inorganic and microbial biomass P fractions, P uptake and dry matter yield of maize. Sorption maxima (Smax) of seven soils examined ranged from 192.3 to 909.1 (mg P kg-1) and were highly and positively correlated with sorption affinity constant (r = 0.93, p = 0.01) and organic C (r = 0.71, p = 0.01). The amount of P required for maintaining a soil solution concentration of 0.2 mg P l-1 ranged from 2.1 to 123.5 mg P kg-1 soil. Soils collected from Qweqwe (a Cambisol), Qunu (an Acrisol), Ncihane (a Luvisol) and Bethania (a Ferralsol) had lower external P requirement values and were classified as lower sorbers, whereas soils from Ntlonyana (a Planosol), Chevy Chase (a Ferralsol) and Flagstaff (a Ferralsol) were classified as moderate sorbers. The results suggested that P availability could be compromised in 43 percent iii of the soils studied and that measures to mitigate the adverse effects of P sorption were needed to ensure that P is not a limiting factor to crop production, where such soils are found. Goat manure addition at varying rates (5, 10 and 20 tha-1 dry weight basis) to two of the moderately P fixing soils from Chevy Chase and Flagstaff, reduced P sorption maxima (Smax) compared to the control treatment. Phosphate sorption decreased with increasing amounts of goat manure in both soils but the extent of reduction was greater on Chevy Chase soil than on Flagstaff soil. The relative liming effects of the different rates of goat manure followed the order 20 t GM ha-1 > 10 t GM ha-1 > 5 t GM ha-1. In a separate experiment, addition of inorganic P at varying rates (0, 90, 180, and 360 kg P ha-1) to Flagstaff soil increased labile P fractions (resin P, biomass P and NaHCO3-Pi) and the increases were greater when goat manure was co-applied. The control treatments contained only 17.2 and 27.5 mg P kg-1 of resin extractable P in the un-amended and manure amended treatments, respectively which increased to 118.2 and 122.7 mg P kg-1 on day 28 of incubation. Biomass P concentration was increased from 16.8 to 43.9 mg P kg-1 in P alone treatments but the fraction was greatly enhanced with manure addition, increasing it from 32.6 to 97.7 mg P kg-1. NaOH-Pi was the largest extractable Pi fraction and ranged from 144.3 to 250.6 mg P kg-1 and 107.5 to 213.2 mg P kg-1 in the unamended and manure amended treatments, respectively. Dry matter yield and P uptake by maize grown in the glasshouse were highly and significantly (p = 0.05) correlated with the different P fractions in the soil. The correlations followed the order resin P (r = 0.85) > NaOH-Pi (r = 0.85) > NaHCO3-Pi (r = 0.84) >> biomass P (r = 0.56) for dry matter yield at 6 weeks after planting. At 12 weeks after planting, goat manure had iv highly significant effects on resin P and biomass P but had no effect on NaHCO3-Pi and NaOH–Pi. The combination of biomass P, resin P and NaHCO3-Pi explained 75.8 percent of the variation in dry matter yield of which 63.0 percent of the variation was explained by biomass P alone. The greatest increase in biomass P occurred when added P was co-applied with 5 or 10 tha-1 goat manure. The predictive equation for maize dry matter yield (DM) was: DM (g) = 1.897 biomass P + 0.645 resin P (r = 0.73). Resin P was the fraction that was most depleted due to plant uptake and decreased by 56 to 68 percent between the 6th week and the 12th week of sampling indicating that it played a greater role in supplying plant available P. The results therefore suggested that the use of goat manure may allow resource poor farmers to use lower levels of commercial phosphate fertilizers because of its effect to reduce soil P sorption. In addition, higher increases in biomass P due to manure addition observed at lower rates of added P indicated that goat manure has potential for enhancing bioavailability and fertilizer use efficiency of small inorganic P applications.
- Full Text:
- Date Issued: 2007
- Authors: Gichangi, Elias Maina
- Date: 2007
- Subjects: Phosphorus in agriculture , Soils -- Phosphorus content , Phosphatic fertilizers , Soils -- Phosphorus content -- South Africa -- Transkei
- Language: English
- Type: Thesis , Doctoral , PhD (Soil Science)
- Identifier: vital:11960 , http://hdl.handle.net/10353/80 , Phosphorus in agriculture , Soils -- Phosphorus content , Phosphatic fertilizers , Soils -- Phosphorus content -- South Africa -- Transkei
- Description: Low availability of soil phosphorus (P) caused by strong sorption of P is a major constraint to agricultural production in most South African soils, particularly those from the high rainfall areas. The aim of this study was therefore to investigate whether combined addition of goat manure with inorganic P fertilizers could enhance P availability in some P fixing soils of the Transkei region, South Africa. The study addressed the following specific objectives (i) to assess P sorption capacities and requirements of selected soils and their relationship with selected soil properties and single point sorption test, (ii) to assess the effects of goat manure and lime addition on P sorption properties of selected P fixing soils (iii) to assess the temporal changes in concentration of inorganic and microbial biomass P fractions following application of inorganic fertilizer P with goat manure in a laboratory incubation experiment, and, (iv) to assess the effects of goat manure application with inorganic phosphate on inorganic and microbial biomass P fractions, P uptake and dry matter yield of maize. Sorption maxima (Smax) of seven soils examined ranged from 192.3 to 909.1 (mg P kg-1) and were highly and positively correlated with sorption affinity constant (r = 0.93, p = 0.01) and organic C (r = 0.71, p = 0.01). The amount of P required for maintaining a soil solution concentration of 0.2 mg P l-1 ranged from 2.1 to 123.5 mg P kg-1 soil. Soils collected from Qweqwe (a Cambisol), Qunu (an Acrisol), Ncihane (a Luvisol) and Bethania (a Ferralsol) had lower external P requirement values and were classified as lower sorbers, whereas soils from Ntlonyana (a Planosol), Chevy Chase (a Ferralsol) and Flagstaff (a Ferralsol) were classified as moderate sorbers. The results suggested that P availability could be compromised in 43 percent iii of the soils studied and that measures to mitigate the adverse effects of P sorption were needed to ensure that P is not a limiting factor to crop production, where such soils are found. Goat manure addition at varying rates (5, 10 and 20 tha-1 dry weight basis) to two of the moderately P fixing soils from Chevy Chase and Flagstaff, reduced P sorption maxima (Smax) compared to the control treatment. Phosphate sorption decreased with increasing amounts of goat manure in both soils but the extent of reduction was greater on Chevy Chase soil than on Flagstaff soil. The relative liming effects of the different rates of goat manure followed the order 20 t GM ha-1 > 10 t GM ha-1 > 5 t GM ha-1. In a separate experiment, addition of inorganic P at varying rates (0, 90, 180, and 360 kg P ha-1) to Flagstaff soil increased labile P fractions (resin P, biomass P and NaHCO3-Pi) and the increases were greater when goat manure was co-applied. The control treatments contained only 17.2 and 27.5 mg P kg-1 of resin extractable P in the un-amended and manure amended treatments, respectively which increased to 118.2 and 122.7 mg P kg-1 on day 28 of incubation. Biomass P concentration was increased from 16.8 to 43.9 mg P kg-1 in P alone treatments but the fraction was greatly enhanced with manure addition, increasing it from 32.6 to 97.7 mg P kg-1. NaOH-Pi was the largest extractable Pi fraction and ranged from 144.3 to 250.6 mg P kg-1 and 107.5 to 213.2 mg P kg-1 in the unamended and manure amended treatments, respectively. Dry matter yield and P uptake by maize grown in the glasshouse were highly and significantly (p = 0.05) correlated with the different P fractions in the soil. The correlations followed the order resin P (r = 0.85) > NaOH-Pi (r = 0.85) > NaHCO3-Pi (r = 0.84) >> biomass P (r = 0.56) for dry matter yield at 6 weeks after planting. At 12 weeks after planting, goat manure had iv highly significant effects on resin P and biomass P but had no effect on NaHCO3-Pi and NaOH–Pi. The combination of biomass P, resin P and NaHCO3-Pi explained 75.8 percent of the variation in dry matter yield of which 63.0 percent of the variation was explained by biomass P alone. The greatest increase in biomass P occurred when added P was co-applied with 5 or 10 tha-1 goat manure. The predictive equation for maize dry matter yield (DM) was: DM (g) = 1.897 biomass P + 0.645 resin P (r = 0.73). Resin P was the fraction that was most depleted due to plant uptake and decreased by 56 to 68 percent between the 6th week and the 12th week of sampling indicating that it played a greater role in supplying plant available P. The results therefore suggested that the use of goat manure may allow resource poor farmers to use lower levels of commercial phosphate fertilizers because of its effect to reduce soil P sorption. In addition, higher increases in biomass P due to manure addition observed at lower rates of added P indicated that goat manure has potential for enhancing bioavailability and fertilizer use efficiency of small inorganic P applications.
- Full Text:
- Date Issued: 2007
Establishing the benefits of implementing an I.T. project management office in the Nelson Mandela Metropolitan area
- Martin, Michael Ronald Charles
- Authors: Martin, Michael Ronald Charles
- Date: 2007
- Subjects: Project management -- South Africa -- Port Elizabeth -- Computer network resources , Information technology -- South Africa -- Port Elizabeth -- Management
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9266 , http://hdl.handle.net/10948/558 , Project management -- South Africa -- Port Elizabeth -- Computer network resources , Information technology -- South Africa -- Port Elizabeth -- Management
- Description: The well-known concept of a Project Manager managing an I.T. project in relative isolation is no longer a viable option for organisations that are running numerous projects simultaneously. Due to the enormous costs and risks involved in many of these projects, there needs to be a means to ensure success. This has led to the establishment of the concept of a Project Management Office (PMO). An autonomous business unit that is responsible for managing all projects within an organisation. The need for a Project Management Office (PMO) to effectively manage multiple projects is becoming more and more accepted worldwide. The benefits of a PMO are well documented, but whether these benefits will apply to organisations within the NMM area needed to be investigated. A detailed analysis of the benefits of Project Management and in particular a PMO, have been investigated by means of a literature study. An investigation into the effectiveness of PMO’s in South Africa in general, was conducted by means of a survey targeted at a group of I.T. Project Managers located in all the major centres. A further survey was conducted among local I.T. managers to determine their current level of success and their expectations for the future. When reviewing the expectations of local I.T. management against the performance of Project Managers that are currently operating within PMOs, it is clear that organisations within the NMM area are in need of PMO’s and would certainly benefit from their establishment.
- Full Text:
- Date Issued: 2007
- Authors: Martin, Michael Ronald Charles
- Date: 2007
- Subjects: Project management -- South Africa -- Port Elizabeth -- Computer network resources , Information technology -- South Africa -- Port Elizabeth -- Management
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9266 , http://hdl.handle.net/10948/558 , Project management -- South Africa -- Port Elizabeth -- Computer network resources , Information technology -- South Africa -- Port Elizabeth -- Management
- Description: The well-known concept of a Project Manager managing an I.T. project in relative isolation is no longer a viable option for organisations that are running numerous projects simultaneously. Due to the enormous costs and risks involved in many of these projects, there needs to be a means to ensure success. This has led to the establishment of the concept of a Project Management Office (PMO). An autonomous business unit that is responsible for managing all projects within an organisation. The need for a Project Management Office (PMO) to effectively manage multiple projects is becoming more and more accepted worldwide. The benefits of a PMO are well documented, but whether these benefits will apply to organisations within the NMM area needed to be investigated. A detailed analysis of the benefits of Project Management and in particular a PMO, have been investigated by means of a literature study. An investigation into the effectiveness of PMO’s in South Africa in general, was conducted by means of a survey targeted at a group of I.T. Project Managers located in all the major centres. A further survey was conducted among local I.T. managers to determine their current level of success and their expectations for the future. When reviewing the expectations of local I.T. management against the performance of Project Managers that are currently operating within PMOs, it is clear that organisations within the NMM area are in need of PMO’s and would certainly benefit from their establishment.
- Full Text:
- Date Issued: 2007
Estimating erosion of cretaceous-aged kimberlites in the Republic of South Africa through the examination of upper-crustal xenoliths
- Authors: Hanson, Emily Kate
- Date: 2007
- Subjects: Kimberlite -- South Africa , Igneous rocks -- Inclusions -- South Africa , Erosion -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4942 , http://hdl.handle.net/10962/d1005554 , Kimberlite -- South Africa , Igneous rocks -- Inclusions -- South Africa , Erosion -- South Africa
- Description: he estimation of post-emplacement kimberlite erosion in South Africa through the study of upper-crustal xenoliths is relatively unexplored; however the presence of these xenoliths has been recognized for well over 100 years. Post-emplacement erosion levels of a small number of South African kimberlite pipes have been inferred through the study of the degree of country-rock diagenesis, the depth of sill formation, the depth of the initiation of the diatreme and fission track studies. Through these studies, several estimates were proposed for the Group I Kimberley kimberlites. Although the 1400 m estimate of erosion remains widely accepted today, this estimate relies on the presence of Karoo-like basalt xenoliths in the Group I Kimberley kimberlites, as their presence proves that basalt existed in the Kimberley area when the kimberlites were emplaced. Basaltic xenoliths were described during the early stages of mining in Kimberley, though only one of these descriptions suggests that the ‘basaltic’ boulders correlate with the Karoo basalts. Because of the discrepancy between these early documentations of upper-crustal xenoliths and because the occurrence of Karoo-like basalt xenoliths in the Group I Kimberley kimberlites is under question, a re-investigation of the erosion levels and the upper crustal xenolith suites in South African, Cretaceous-aged kimberlites, including Melton Wold, Voorspoed, Roberts Victor, West End, Record Stone Quarry, Finsch, Markt, Frank Smith, Pampoenpoort, Uintjiesberg, Koffiefontein / Ebenheuyser, Monastery, Kimberley (Big Hole), Kamfersdam , Jagersfontein, Kaal Vallei, De Beers, Bultfontein, Lushof, Britstown Cluster, Hebron and Lovedale, was conducted. This study presents the analytical results for upper-crustal sandstone and basalt xenoliths collected from dumps, excavation pits and borehole core at the above-mentioned kimberlites, and demonstrates that they correlate with stratigraphic units of the Karoo Supergroup on the basis of mineral and geochemical compositions. These upper-crustal xenoliths are incorporated into kimberlites and down-rafted to levels below their stratigraphic position during kimberlite emplacement, consequently recording the broad stratigraphy into which each kimberlite is emplaced. Therefore, the Cretaceous lateral extent of the Karoo Supergroup is inferred and post-emplacement erosion estimated by reconstructing the stratigraphy based on upper-crustal xenolith suites for each kimberlite and calculating the total thickness of the now-eroded units. The distribution of sandstone xenoliths indicates that during the Cretaceous the lateral extent of the Dwyka, Ecca and Beaufort Groups encompassed all of the examined kimberlites, while the ‘Stormberg’ Group was constrained to an area outlined by the Voorspoed and Monastery kimberlites. Similarly, basalt xenoliths occur in all of the Group II and transitional (143 – 100 Ma) kimberlites but only in the Group I (90 – 74 Ma) kimberlites that lie within close proximity to the western outcrop margin of the outcrop area of the Drakensberg Group basalts (Lesotho Remnant), namely Monastery, Jagersfontein and Kaal Vallei. This trend implies an eastward-retreat of the inland erosion front of the Karoo basalts between 140 and 90 Ma and subsequent erosion of the underlying sedimentary units. It also suggests that a thicker succession of Karoo strata was present at the time of Group II and transitional kimberlite emplacement and that there has been more post-emplacement erosion in these kimberlites than the younger Group I kimberlites, except for Monastery, Jagersfontein and Kaal Vallei. Estimates are unique to each kimberlite as they are dependent on both stratigraphic location, elevation and present country rock, and range from approximately 1000 – 2500 m for the older kimberlites and less than 700 m to 1400 m for the younger kimberlites. Furthermore, the upper-crustal xenoliths found at the Group I Kimberley kimberlites and the coinciding trend of basalt erosion demonstrate that Karoo basalts were eroded from the Kimberley area by the time the Group I Kimberley kimberlites erupted (~85 Ma). Therefore, basalts are omitted from the Group I Kimberley kimberlites post-emplacement erosion estimate, and the upper Beaufort Group is considered the upper limit of the stratigraphy that was present at the time of the eruption of the Group I Kimberley pipes. Therefore, the erosion estimates decrease from a previous estimate of 1400 m down to 400 to 1100 m, where 850 m is considered a dependable intermediate estimate.
- Full Text:
- Date Issued: 2007
- Authors: Hanson, Emily Kate
- Date: 2007
- Subjects: Kimberlite -- South Africa , Igneous rocks -- Inclusions -- South Africa , Erosion -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4942 , http://hdl.handle.net/10962/d1005554 , Kimberlite -- South Africa , Igneous rocks -- Inclusions -- South Africa , Erosion -- South Africa
- Description: he estimation of post-emplacement kimberlite erosion in South Africa through the study of upper-crustal xenoliths is relatively unexplored; however the presence of these xenoliths has been recognized for well over 100 years. Post-emplacement erosion levels of a small number of South African kimberlite pipes have been inferred through the study of the degree of country-rock diagenesis, the depth of sill formation, the depth of the initiation of the diatreme and fission track studies. Through these studies, several estimates were proposed for the Group I Kimberley kimberlites. Although the 1400 m estimate of erosion remains widely accepted today, this estimate relies on the presence of Karoo-like basalt xenoliths in the Group I Kimberley kimberlites, as their presence proves that basalt existed in the Kimberley area when the kimberlites were emplaced. Basaltic xenoliths were described during the early stages of mining in Kimberley, though only one of these descriptions suggests that the ‘basaltic’ boulders correlate with the Karoo basalts. Because of the discrepancy between these early documentations of upper-crustal xenoliths and because the occurrence of Karoo-like basalt xenoliths in the Group I Kimberley kimberlites is under question, a re-investigation of the erosion levels and the upper crustal xenolith suites in South African, Cretaceous-aged kimberlites, including Melton Wold, Voorspoed, Roberts Victor, West End, Record Stone Quarry, Finsch, Markt, Frank Smith, Pampoenpoort, Uintjiesberg, Koffiefontein / Ebenheuyser, Monastery, Kimberley (Big Hole), Kamfersdam , Jagersfontein, Kaal Vallei, De Beers, Bultfontein, Lushof, Britstown Cluster, Hebron and Lovedale, was conducted. This study presents the analytical results for upper-crustal sandstone and basalt xenoliths collected from dumps, excavation pits and borehole core at the above-mentioned kimberlites, and demonstrates that they correlate with stratigraphic units of the Karoo Supergroup on the basis of mineral and geochemical compositions. These upper-crustal xenoliths are incorporated into kimberlites and down-rafted to levels below their stratigraphic position during kimberlite emplacement, consequently recording the broad stratigraphy into which each kimberlite is emplaced. Therefore, the Cretaceous lateral extent of the Karoo Supergroup is inferred and post-emplacement erosion estimated by reconstructing the stratigraphy based on upper-crustal xenolith suites for each kimberlite and calculating the total thickness of the now-eroded units. The distribution of sandstone xenoliths indicates that during the Cretaceous the lateral extent of the Dwyka, Ecca and Beaufort Groups encompassed all of the examined kimberlites, while the ‘Stormberg’ Group was constrained to an area outlined by the Voorspoed and Monastery kimberlites. Similarly, basalt xenoliths occur in all of the Group II and transitional (143 – 100 Ma) kimberlites but only in the Group I (90 – 74 Ma) kimberlites that lie within close proximity to the western outcrop margin of the outcrop area of the Drakensberg Group basalts (Lesotho Remnant), namely Monastery, Jagersfontein and Kaal Vallei. This trend implies an eastward-retreat of the inland erosion front of the Karoo basalts between 140 and 90 Ma and subsequent erosion of the underlying sedimentary units. It also suggests that a thicker succession of Karoo strata was present at the time of Group II and transitional kimberlite emplacement and that there has been more post-emplacement erosion in these kimberlites than the younger Group I kimberlites, except for Monastery, Jagersfontein and Kaal Vallei. Estimates are unique to each kimberlite as they are dependent on both stratigraphic location, elevation and present country rock, and range from approximately 1000 – 2500 m for the older kimberlites and less than 700 m to 1400 m for the younger kimberlites. Furthermore, the upper-crustal xenoliths found at the Group I Kimberley kimberlites and the coinciding trend of basalt erosion demonstrate that Karoo basalts were eroded from the Kimberley area by the time the Group I Kimberley kimberlites erupted (~85 Ma). Therefore, basalts are omitted from the Group I Kimberley kimberlites post-emplacement erosion estimate, and the upper Beaufort Group is considered the upper limit of the stratigraphy that was present at the time of the eruption of the Group I Kimberley pipes. Therefore, the erosion estimates decrease from a previous estimate of 1400 m down to 400 to 1100 m, where 850 m is considered a dependable intermediate estimate.
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- Date Issued: 2007