A systems approach to project implementation within the public sector towards formulating a framework for project evaluation
- Authors: Greyling, Een Lange
- Date: 2012
- Subjects: Project management -- South Africa , Corporations, Government -- South Africa , Construction industry -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9721 , http://hdl.handle.net/10948/d1021223
- Description: The procurement process, from the demand formulation to the final delivery of a public building to the end-user, is defined by the government in terms of procedures and policies to be followed, which is based to be ineffective and inefficient where the process as a whole from a client-value perpective, is flawed. Presently, the National Department of Public Works(NDPW) as a governmental administration is deemed to be a controlling institution and cost centre rather than a service provider. This mind-set is reflected by the inability of government project implementing agencies such as the NDPW to deliver projects successfully in terms of cost, time, and quality whilst failing to meet the government's socio economic objectives to create employment opportunities, stimulate economic growth, and transfer skills to the previously disadvantaged through black economic empowerment (BEE) initiatives. Client satisfaction has widely been recognised by researchers as one of the key challenges for quality improvement in the construction industry. It is a vital factor in the development and management of the construction process, as well in the creation of efficient organisation-client relationship. In addition, client satisfaction is deemed to be a catalyst for client retention which is a success strategy for any organisation. This thesis is primarily concerned with project performance and service delivery by the NDPW as a government project implementing agency that involves an integrated approach that considers the entire supply chain of a construction project. The success or failure of a project is is not the effect of a single variable, or factor, but a set of variables interacting with each other to produce the final result. An extensive review of related literature that entails the analysis of publications related to the projectimplementation and construction project management realm was deemed necessary to formulate a clear understanding of the complexities of implementing projjects within the public sector. The use of systems thinking as the nucleus of the multi-methodological approach to this research was to assist in ascertaining the primary causes of the problem situation and to clarify the process of project implementation as a sub-system within the greater system of the construction industry. The success of projects depends as much on the client as it does on the implementing agencies, project managers (PMs), consultants, contractors and the suppliers of materials.
- Full Text:
- Date Issued: 2012
- Authors: Greyling, Een Lange
- Date: 2012
- Subjects: Project management -- South Africa , Corporations, Government -- South Africa , Construction industry -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9721 , http://hdl.handle.net/10948/d1021223
- Description: The procurement process, from the demand formulation to the final delivery of a public building to the end-user, is defined by the government in terms of procedures and policies to be followed, which is based to be ineffective and inefficient where the process as a whole from a client-value perpective, is flawed. Presently, the National Department of Public Works(NDPW) as a governmental administration is deemed to be a controlling institution and cost centre rather than a service provider. This mind-set is reflected by the inability of government project implementing agencies such as the NDPW to deliver projects successfully in terms of cost, time, and quality whilst failing to meet the government's socio economic objectives to create employment opportunities, stimulate economic growth, and transfer skills to the previously disadvantaged through black economic empowerment (BEE) initiatives. Client satisfaction has widely been recognised by researchers as one of the key challenges for quality improvement in the construction industry. It is a vital factor in the development and management of the construction process, as well in the creation of efficient organisation-client relationship. In addition, client satisfaction is deemed to be a catalyst for client retention which is a success strategy for any organisation. This thesis is primarily concerned with project performance and service delivery by the NDPW as a government project implementing agency that involves an integrated approach that considers the entire supply chain of a construction project. The success or failure of a project is is not the effect of a single variable, or factor, but a set of variables interacting with each other to produce the final result. An extensive review of related literature that entails the analysis of publications related to the projectimplementation and construction project management realm was deemed necessary to formulate a clear understanding of the complexities of implementing projjects within the public sector. The use of systems thinking as the nucleus of the multi-methodological approach to this research was to assist in ascertaining the primary causes of the problem situation and to clarify the process of project implementation as a sub-system within the greater system of the construction industry. The success of projects depends as much on the client as it does on the implementing agencies, project managers (PMs), consultants, contractors and the suppliers of materials.
- Full Text:
- Date Issued: 2012
Empirical modelling of the solar wind influence on Pc3 pulsation activity
- Authors: Lotz, Stefanus Ignatius
- Date: 2012
- Subjects: Solar wind -- Research Solar activity -- Research Stellar oscillations -- Research , Magnetospheric radio wave propagation , Interplanetary magnetic fields
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5464 , http://hdl.handle.net/10962/d1005249
- Description: Geomagnetic pulsations are ultra-low frequency (ULF) oscillations of the geomagnetic field that have been observed in the magnetosphere and on the Earth since the 1800’s. In the 1960’s in situ observations of the solar wind suggested that the source of pulsation activity must lie beyond the magnetosphere. In this work the influence of several solar wind plasma and interplanetary magnetic field (IMF) parameters on Pc3 pulsations are studied. Pc3 pulsations are a class of geomagnetic pulsations with frequency ranging between 22 and 100 mHz. A large dataset of solar wind and pulsation measurements is employed to develop two empirical models capable of predicting the Pc3 index (an indication of Pc3 intensity) at one hour and five minute time resolution, respectively. The models are based on artificial neural networks, due to their ability to model highly non-linear interactions between dependent and independent variables. A robust, iterative process is followed to find and rank the set of solar wind input parameters that optimally predict Pc3 activity. According to the parameter selection process the input parameters to the low resolution model (1 hour data) are, in order of importance, solar wind speed, a pair of time-based parameters, dynamic solar wind pressure, and the IMF orientation with respect to the Sun-Earth line (i.e. the cone angle). Input parameters to the high resolution model (5 minute data) are solar wind speed, cone angle, solar wind density and a pair of time-based parameters. Both models accurately predict Pc3 intensity from unseen solar wind data. It is observed that Pc3 activity ceases when the density in the solar wind is very low, even while other conditions are favourable for the generation and propagation of ULF waves. The influence that solar wind density has on Pc3 activity is studied by analysing six years of solar wind and Pc3 measurements at one minute resolution. It is suggested that the pause in Pc3 activity occurs due to two reasons: Firstly, the ULF waves that are generated in the region upstream of the bow shock does not grow efficiently if the solar wind density is very low; and secondly, waves that are generated cannot be convected into the magnetosphere because of the low Mach number of the solar wind plasma due to the decreased density.
- Full Text:
- Date Issued: 2012
- Authors: Lotz, Stefanus Ignatius
- Date: 2012
- Subjects: Solar wind -- Research Solar activity -- Research Stellar oscillations -- Research , Magnetospheric radio wave propagation , Interplanetary magnetic fields
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5464 , http://hdl.handle.net/10962/d1005249
- Description: Geomagnetic pulsations are ultra-low frequency (ULF) oscillations of the geomagnetic field that have been observed in the magnetosphere and on the Earth since the 1800’s. In the 1960’s in situ observations of the solar wind suggested that the source of pulsation activity must lie beyond the magnetosphere. In this work the influence of several solar wind plasma and interplanetary magnetic field (IMF) parameters on Pc3 pulsations are studied. Pc3 pulsations are a class of geomagnetic pulsations with frequency ranging between 22 and 100 mHz. A large dataset of solar wind and pulsation measurements is employed to develop two empirical models capable of predicting the Pc3 index (an indication of Pc3 intensity) at one hour and five minute time resolution, respectively. The models are based on artificial neural networks, due to their ability to model highly non-linear interactions between dependent and independent variables. A robust, iterative process is followed to find and rank the set of solar wind input parameters that optimally predict Pc3 activity. According to the parameter selection process the input parameters to the low resolution model (1 hour data) are, in order of importance, solar wind speed, a pair of time-based parameters, dynamic solar wind pressure, and the IMF orientation with respect to the Sun-Earth line (i.e. the cone angle). Input parameters to the high resolution model (5 minute data) are solar wind speed, cone angle, solar wind density and a pair of time-based parameters. Both models accurately predict Pc3 intensity from unseen solar wind data. It is observed that Pc3 activity ceases when the density in the solar wind is very low, even while other conditions are favourable for the generation and propagation of ULF waves. The influence that solar wind density has on Pc3 activity is studied by analysing six years of solar wind and Pc3 measurements at one minute resolution. It is suggested that the pause in Pc3 activity occurs due to two reasons: Firstly, the ULF waves that are generated in the region upstream of the bow shock does not grow efficiently if the solar wind density is very low; and secondly, waves that are generated cannot be convected into the magnetosphere because of the low Mach number of the solar wind plasma due to the decreased density.
- Full Text:
- Date Issued: 2012
Best practices to create an enabling environment for SME incubation in South Africa
- Authors: Dames, Ricardo Shane
- Date: 2012
- Subjects: Business incubators -- South Africa , New business enterprises -- South Africa , Small businesses -- South Africa -- Management
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: vital:9301 , http://hdl.handle.net/10948/d1015031
- Description: The humble beginnings of business incubators date back to the 1970s in the USA and United Kingdom, where abandoned industrial buildings were converted to rent out to small businesses. South Africa (SA) was first introduced to business incubation in the 1980s when the Small Business Development Corporation (SBDC) established a number of business ‘hives’ and provided business space to entrepreneurs to operate their businesses. In their most basic form, business incubators provide a safe and nurturing environment for entrepreneurs to establish their small businesses. While in incubation, the Small and Medium Enterprises (SMEs) are supported with a number of services which assist their growth and development until they are able to exit the incubator as sustainable and viable businesses. Global incubator models have matured significantly, and now include assisting with business idea generation, accelerating business start-ups and commercialisation processes, and identifying high-growth orientated SMEs to assist them with gaining market access. The establishment of business incubators was a government-driven initiative, and more than 33 SME incubators exist in SA. Most of the incubators are government-funded, and have focused on the establishment and growth of SMEs to act as a catalyst to promote economic development and alleviate socio-economic challenges such as unemployment and poverty. Despite these noble objectives, incubation in SA has not been fully utilised, and a high SME failure rate still prevails in the country. One of the reasons for SME failure may be ascribed to the lack of an enabling SME incubation environment in SA. When compared to other developing countries such as Brazil with as many as 400 incubators, it is clear that the SA incubation industry still needs further development. The purpose of this study therefore was to ascertain the best practices of global business incubators in both developed and developing countries, and how SA incubators could learn from these best practices to create a more conducive and enabling SME incubation environment. Background literature on business incubation with a specific focus on best practices in world incubators in both developed and developing countries, was reviewed. Some of the literature reviewed included Aernoudt (2004), Buys and Mbewana (2007) and Chandra (2009). From the literature review, four main best practice areas were identified, namely strategic focus, sources of funding, incubator services, and the role of government. The study followed a qualitative approach, and an interview schedule was developed to seek the perceptions of incubator managers on how the four identified best practices can be utilised to create an enabling SA incubation environment. A survey was conducted by interviewing 14 incubator managers (twelve government and two private) in SA. Data was collected over a six-month period, using face-to-face and telephonic interviews. Data was analysed using the content analysis, constant comparison, grounded theory and case study methods. The biographical profiles of the incubator managers and incubators were presented in case studies. An initial analysis was made to identify themes and sub themes within the four best practices explored, using the constant comparison method. Thereafter a provincial comparative analysis was made, as well as a comparison of government funded versus privately funded incubators. The findings suggested that there is a relatively high turnover in incubator management, and that they often do not have incubator management experience. A provincial comparison of SA incubators revealed that their strategic focuses are greatly influenced by the industry prevailing in the various provinces. All SA incubators provide pre- and post incubation services, but few are utilising virtual incubation. Most SA incubators are government-funded, and some use a hybrid funding model. It was evident that most SA incubators are aware of government policies and programmes available to assist them on local, provincial and national levels. A comparison of the best practices of two developing countries and three developed countries, as well as suggestions made by SA incubator managers indicated that SA has indeed followed best practices from both developing and developed countries, but there are areas of non-alignment which provide scope for improvement, to create a more conducive and enabling incubation environment. This study recommends that incubators should have an entrepreneurial focus, and reposition and align their strategic focus with government policies and instruments. SA incubators must pursue opportunities for virtual incubation as well as linkages with academic institutions, in order to offer value-added services such as research, development and commercialisation of the product ideas. Incubators in SA must pursue a hybrid funding model with a combination of government and private funding, and generate some or their own income. With regard to the role of government, it is recommended that the roll-out of more industry-specific incubators be privatised, and that an overseeing body for incubation be established.
- Full Text:
- Date Issued: 2012
- Authors: Dames, Ricardo Shane
- Date: 2012
- Subjects: Business incubators -- South Africa , New business enterprises -- South Africa , Small businesses -- South Africa -- Management
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: vital:9301 , http://hdl.handle.net/10948/d1015031
- Description: The humble beginnings of business incubators date back to the 1970s in the USA and United Kingdom, where abandoned industrial buildings were converted to rent out to small businesses. South Africa (SA) was first introduced to business incubation in the 1980s when the Small Business Development Corporation (SBDC) established a number of business ‘hives’ and provided business space to entrepreneurs to operate their businesses. In their most basic form, business incubators provide a safe and nurturing environment for entrepreneurs to establish their small businesses. While in incubation, the Small and Medium Enterprises (SMEs) are supported with a number of services which assist their growth and development until they are able to exit the incubator as sustainable and viable businesses. Global incubator models have matured significantly, and now include assisting with business idea generation, accelerating business start-ups and commercialisation processes, and identifying high-growth orientated SMEs to assist them with gaining market access. The establishment of business incubators was a government-driven initiative, and more than 33 SME incubators exist in SA. Most of the incubators are government-funded, and have focused on the establishment and growth of SMEs to act as a catalyst to promote economic development and alleviate socio-economic challenges such as unemployment and poverty. Despite these noble objectives, incubation in SA has not been fully utilised, and a high SME failure rate still prevails in the country. One of the reasons for SME failure may be ascribed to the lack of an enabling SME incubation environment in SA. When compared to other developing countries such as Brazil with as many as 400 incubators, it is clear that the SA incubation industry still needs further development. The purpose of this study therefore was to ascertain the best practices of global business incubators in both developed and developing countries, and how SA incubators could learn from these best practices to create a more conducive and enabling SME incubation environment. Background literature on business incubation with a specific focus on best practices in world incubators in both developed and developing countries, was reviewed. Some of the literature reviewed included Aernoudt (2004), Buys and Mbewana (2007) and Chandra (2009). From the literature review, four main best practice areas were identified, namely strategic focus, sources of funding, incubator services, and the role of government. The study followed a qualitative approach, and an interview schedule was developed to seek the perceptions of incubator managers on how the four identified best practices can be utilised to create an enabling SA incubation environment. A survey was conducted by interviewing 14 incubator managers (twelve government and two private) in SA. Data was collected over a six-month period, using face-to-face and telephonic interviews. Data was analysed using the content analysis, constant comparison, grounded theory and case study methods. The biographical profiles of the incubator managers and incubators were presented in case studies. An initial analysis was made to identify themes and sub themes within the four best practices explored, using the constant comparison method. Thereafter a provincial comparative analysis was made, as well as a comparison of government funded versus privately funded incubators. The findings suggested that there is a relatively high turnover in incubator management, and that they often do not have incubator management experience. A provincial comparison of SA incubators revealed that their strategic focuses are greatly influenced by the industry prevailing in the various provinces. All SA incubators provide pre- and post incubation services, but few are utilising virtual incubation. Most SA incubators are government-funded, and some use a hybrid funding model. It was evident that most SA incubators are aware of government policies and programmes available to assist them on local, provincial and national levels. A comparison of the best practices of two developing countries and three developed countries, as well as suggestions made by SA incubator managers indicated that SA has indeed followed best practices from both developing and developed countries, but there are areas of non-alignment which provide scope for improvement, to create a more conducive and enabling incubation environment. This study recommends that incubators should have an entrepreneurial focus, and reposition and align their strategic focus with government policies and instruments. SA incubators must pursue opportunities for virtual incubation as well as linkages with academic institutions, in order to offer value-added services such as research, development and commercialisation of the product ideas. Incubators in SA must pursue a hybrid funding model with a combination of government and private funding, and generate some or their own income. With regard to the role of government, it is recommended that the roll-out of more industry-specific incubators be privatised, and that an overseeing body for incubation be established.
- Full Text:
- Date Issued: 2012
Development of a value based pricing index for new drugs in metastatic colorectal cancer
- Authors: Dranitsaris, George
- Date: 2012
- Subjects: Drug -- Prices , Prescription pricing , Pharmaceutical industry -- Prices
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10140 , http://hdl.handle.net/10948/d1009310 , Drug -- Prices , Prescription pricing , Pharmaceutical industry -- Prices
- Description: Background: Worldwide, prices for cancer drugs have been under downward pressure where several governments have mandated price cuts of branded and generic products. A better alternative to mandated price cuts would be the estimation of a launch price based on drug performance, cost effectiveness and a country’s ability to pay. In this study, the development of a global pricing index for new drugs that encompasses all of these attributes in patients with metastatic colorectal cancer (mCRC) is described. Methods: A pharmacoeconomic model was developed to simulate clinical outcomes in mCRC patients receiving chemotherapy with the addition of a “new drug” that improves survival by 1.4, 3 and 6 months. Cost and health state utility data were obtained from cancer centers and oncology nurses (total n=112) in Canada (n=24), Spain (n=24), India (n=24), South Africa (n=16) and Malaysia (n=24). A price per dose was estimated for each survival increment using a target value threshold of three times the per capita gross domestic product (GDP) for each country, as recommended by the World Health Organisation (WHO). Multivariable analysis was then used to develop the pricing index, which considers survival benefit, per capita GDP and income dispersion as measured by the Gini coefficient as predictor variables. Results: Higher survival benefits were associated with elevated drug prices, especially in wealthier countries such as Canada and Spain. For a nation like Argentina with a per capita GDP of $15,000 and a Gini coefficient of 51, it is estimated that for a drug which provides a 4 month survival benefit in mCRC, the value based price would be $US 630 per dose. In contrast, the same drug in a wealthier country like Norway could command a price of $US 2,775 and still be considered cost effective according to the WHO criteria. Conclusions: A global pricing index was presented that can be used to estimate a value based price in different countries for new drugs in mCRC. The application of this index to estimate a price based on cost effectiveness would be a good starting point for opening dialogue between the key stakeholders and a better alternative to governments’ mandated price cuts.
- Full Text:
- Date Issued: 2012
- Authors: Dranitsaris, George
- Date: 2012
- Subjects: Drug -- Prices , Prescription pricing , Pharmaceutical industry -- Prices
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:10140 , http://hdl.handle.net/10948/d1009310 , Drug -- Prices , Prescription pricing , Pharmaceutical industry -- Prices
- Description: Background: Worldwide, prices for cancer drugs have been under downward pressure where several governments have mandated price cuts of branded and generic products. A better alternative to mandated price cuts would be the estimation of a launch price based on drug performance, cost effectiveness and a country’s ability to pay. In this study, the development of a global pricing index for new drugs that encompasses all of these attributes in patients with metastatic colorectal cancer (mCRC) is described. Methods: A pharmacoeconomic model was developed to simulate clinical outcomes in mCRC patients receiving chemotherapy with the addition of a “new drug” that improves survival by 1.4, 3 and 6 months. Cost and health state utility data were obtained from cancer centers and oncology nurses (total n=112) in Canada (n=24), Spain (n=24), India (n=24), South Africa (n=16) and Malaysia (n=24). A price per dose was estimated for each survival increment using a target value threshold of three times the per capita gross domestic product (GDP) for each country, as recommended by the World Health Organisation (WHO). Multivariable analysis was then used to develop the pricing index, which considers survival benefit, per capita GDP and income dispersion as measured by the Gini coefficient as predictor variables. Results: Higher survival benefits were associated with elevated drug prices, especially in wealthier countries such as Canada and Spain. For a nation like Argentina with a per capita GDP of $15,000 and a Gini coefficient of 51, it is estimated that for a drug which provides a 4 month survival benefit in mCRC, the value based price would be $US 630 per dose. In contrast, the same drug in a wealthier country like Norway could command a price of $US 2,775 and still be considered cost effective according to the WHO criteria. Conclusions: A global pricing index was presented that can be used to estimate a value based price in different countries for new drugs in mCRC. The application of this index to estimate a price based on cost effectiveness would be a good starting point for opening dialogue between the key stakeholders and a better alternative to governments’ mandated price cuts.
- Full Text:
- Date Issued: 2012
Quantification of the cross-sectoral impacts of waterweeds and their control in Ghana
- Authors: Akpabey, Felix Jerry
- Date: 2012
- Subjects: Water hyacinth -- Control -- Environmental aspects -- Ghana Alien plants -- Research -- Ghana Introduced organisms Economic development -- Social aspects -- Research -- Ghana
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5748 , http://hdl.handle.net/10962/d1005435
- Description: The Akosombo Dam on the Volta River in Ghana was built in 1963 to provide cheap energy to fuel industry and to accelerate the economic growth of the country. It provides hydroelectric power, enhanced fishing and water transportation upstream, and improved opportunities for irrigated farming, especially in the lower reaches, and their attendant economic multiplier effects. A few years after the construction of this major dam, a rapid expansion of industrialization took place in Ghana. This brought about an exponential increase in demand for more electrical power. This led to the construction of a smaller dam at Akuse, downstream of the Akosomho Dam in 1981 and the formation of a headpond at Kpong. The impoundment of the river at the two sites (Akosombo and Kpong) caused an alteration in the existing ecological and biophysical processes in the river basin, including a slowing of the flow of the river, upstream and downstream. Changes in the natural processes, such as a reduction in the flow of the river and an increase in nutrient status of the water, resulted in an invasion of aquatic weeds, increasing the density of aquatic snails (intermediate hosts of schistosomiasis), silting and closure of the estuary, as well as other more subtle effects. The invasion of the river's main course and the dams by aquatic plants led to a corresponding reduction of navigable water both upstream and downstream. The aim of this thesis was to quantify the impact and control of waterweeds, especially water hyacinth, Eichhornia crassipes (Mart) Solms-Laubach (Pontederiaceae), in Ghana. A floral survey on the Kpong Headpond recorded 49 emergent, 12 free floating and I submerged aquatic plant species, many of which were indigenous, but the exotic or introduced water hyacinth was recorded at most of the sampling sites, and was the most abundant and had the biggest impact on the utilization of the water resource. Mats of water hyacinth served as substrates for other, indigenous species to grow out into the main channel of the headpond, including the intake point of the Kpong head works of the Ghana Water Company Limited (GWCL) and landing sites for boats. These mats resulted in a reduction of the fish (fin and shell) harvest, reducing the annual production to far below demand. Water hyacinth was also shown to have severe health implications. A survey of the Ministry of Health records showed that the prevalence of both urinary and intestinal schistosomiasis had risen significantly over time as the abundance of waterweeds, most notably water hyacinth, increased, and ranged between 70% and 75% but up to 100% in some lakeside communities. Based on the work done by an NGO on board the medical boat ("Onipa Nua "), losses in terms of money due to the effect on health of the aquatic weed infestations on the Volta River in 2006 amounted to US$ 620,000. Economic losses due to invasive alien aquatic weeds were also calculated on the Oti River Arm of Lake Volta. It was estimated that about US$2.3 million per annum would be lost to the Volta Lake Transport Company and individual boat transport operators if this section of the river were 100% covered by aquatic weeds (water hyacinth and Salvinia molesta D.S. Mitchell (Salviniaceae)). It was also estimated that US$327,038 was spent annually in monitoring and managing the weeds in the Oti River. Control interventions for aquatic weeds have been implemented in river systems in Ghana. The biological control agents Neochetina bruchi Hustache (Coleoptera, Curculionidae) and Neochetina eichhorniae Warner (Coleoptera, Curculionidae) have been used on water hyacinth infestations in the Oti River Arm of Lake Volta, the Tano River and the Lagoon complex in the south-western part of the country. Cyrtobagous salviniae Calder and Sands (Coleoptera: Curculionidae) has been used to control salvinia, and Neohydronomous affinis Hustache (Coleoptera: Curculionidae) to control water lettuce, Pistia stratiotes Lilmaeus (Araceae) in the Tano River and Lagoon complex. Although these projects have been regarded as successful, they have relied on research from elsewhere in the world and no postrelease quantification has been conducted. In evaluating the impact of the biological control agents Neochetina bruchi and Neochetina eichhorniae weevils on water hyacinth infestations in the Tano River, fresh adult feeding scars were recorded as well as the numbers of adult weevils on each water hyacinth plant sampled at six sites. Despite being released in 1994, weevil numbers and resultant damage to plants in the Tano Lagoon was low in comparison to other regions of the world where these agents have been used. The main reason for this is that this lagoon floods seasonally, washing weevil-infested plants out to sea. Water hyacinth then re-infests the lagoon from seed and the weevil populations are low. To resolve this situation, two courses of action are proposed. The first is to mass rear the weevils along the shore of the lagoon and release them when the first seedlings recruit. The second proposal is that additional agents that have shorter lifecycies and are more mobile than the weevils should be released. To this end, the water hyacinth mirid, Eccritotarsus catarinensis (Carvalho) (Hemiptera: Miridae) was imported from South Africa and released onto the Tano Lagoon in 2009. Retrospective laboratory host specificity trials were conducted on Neachetina eichharniae and Neachetina bruchi weevils 15 years after their release into Ghana to see if any variation in their host ranges had occurred. Considerable damage was inflicted on the E. crassipes leaves by the Neachetina weevils, while little feeding damage was recorded on both Heteranthera callifalia Kunth. (Pontederiaceae) and Eichharnia natans (P.Beauv.) Solms (Pontederiaceae). All the weevils introduced on H callifalia and E. natans died after the first week. This study served to confirm the host specificity and thereby the safety of these agents. Invasive alien aquatic macrophytes have negative impacts on the environment and economy of Ghana. The control of these weeds is essential to socioeconomic development and improved human health standards in riparian communities. Biological control offers a safe and sustainable control option, but requires diligent implementation. However, aquatic weed invasion is more typically a result of the anthropogenically induced eutrophication of water bodies, and this is the main issue that has to be addressed.
- Full Text:
- Date Issued: 2012
- Authors: Akpabey, Felix Jerry
- Date: 2012
- Subjects: Water hyacinth -- Control -- Environmental aspects -- Ghana Alien plants -- Research -- Ghana Introduced organisms Economic development -- Social aspects -- Research -- Ghana
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5748 , http://hdl.handle.net/10962/d1005435
- Description: The Akosombo Dam on the Volta River in Ghana was built in 1963 to provide cheap energy to fuel industry and to accelerate the economic growth of the country. It provides hydroelectric power, enhanced fishing and water transportation upstream, and improved opportunities for irrigated farming, especially in the lower reaches, and their attendant economic multiplier effects. A few years after the construction of this major dam, a rapid expansion of industrialization took place in Ghana. This brought about an exponential increase in demand for more electrical power. This led to the construction of a smaller dam at Akuse, downstream of the Akosomho Dam in 1981 and the formation of a headpond at Kpong. The impoundment of the river at the two sites (Akosombo and Kpong) caused an alteration in the existing ecological and biophysical processes in the river basin, including a slowing of the flow of the river, upstream and downstream. Changes in the natural processes, such as a reduction in the flow of the river and an increase in nutrient status of the water, resulted in an invasion of aquatic weeds, increasing the density of aquatic snails (intermediate hosts of schistosomiasis), silting and closure of the estuary, as well as other more subtle effects. The invasion of the river's main course and the dams by aquatic plants led to a corresponding reduction of navigable water both upstream and downstream. The aim of this thesis was to quantify the impact and control of waterweeds, especially water hyacinth, Eichhornia crassipes (Mart) Solms-Laubach (Pontederiaceae), in Ghana. A floral survey on the Kpong Headpond recorded 49 emergent, 12 free floating and I submerged aquatic plant species, many of which were indigenous, but the exotic or introduced water hyacinth was recorded at most of the sampling sites, and was the most abundant and had the biggest impact on the utilization of the water resource. Mats of water hyacinth served as substrates for other, indigenous species to grow out into the main channel of the headpond, including the intake point of the Kpong head works of the Ghana Water Company Limited (GWCL) and landing sites for boats. These mats resulted in a reduction of the fish (fin and shell) harvest, reducing the annual production to far below demand. Water hyacinth was also shown to have severe health implications. A survey of the Ministry of Health records showed that the prevalence of both urinary and intestinal schistosomiasis had risen significantly over time as the abundance of waterweeds, most notably water hyacinth, increased, and ranged between 70% and 75% but up to 100% in some lakeside communities. Based on the work done by an NGO on board the medical boat ("Onipa Nua "), losses in terms of money due to the effect on health of the aquatic weed infestations on the Volta River in 2006 amounted to US$ 620,000. Economic losses due to invasive alien aquatic weeds were also calculated on the Oti River Arm of Lake Volta. It was estimated that about US$2.3 million per annum would be lost to the Volta Lake Transport Company and individual boat transport operators if this section of the river were 100% covered by aquatic weeds (water hyacinth and Salvinia molesta D.S. Mitchell (Salviniaceae)). It was also estimated that US$327,038 was spent annually in monitoring and managing the weeds in the Oti River. Control interventions for aquatic weeds have been implemented in river systems in Ghana. The biological control agents Neochetina bruchi Hustache (Coleoptera, Curculionidae) and Neochetina eichhorniae Warner (Coleoptera, Curculionidae) have been used on water hyacinth infestations in the Oti River Arm of Lake Volta, the Tano River and the Lagoon complex in the south-western part of the country. Cyrtobagous salviniae Calder and Sands (Coleoptera: Curculionidae) has been used to control salvinia, and Neohydronomous affinis Hustache (Coleoptera: Curculionidae) to control water lettuce, Pistia stratiotes Lilmaeus (Araceae) in the Tano River and Lagoon complex. Although these projects have been regarded as successful, they have relied on research from elsewhere in the world and no postrelease quantification has been conducted. In evaluating the impact of the biological control agents Neochetina bruchi and Neochetina eichhorniae weevils on water hyacinth infestations in the Tano River, fresh adult feeding scars were recorded as well as the numbers of adult weevils on each water hyacinth plant sampled at six sites. Despite being released in 1994, weevil numbers and resultant damage to plants in the Tano Lagoon was low in comparison to other regions of the world where these agents have been used. The main reason for this is that this lagoon floods seasonally, washing weevil-infested plants out to sea. Water hyacinth then re-infests the lagoon from seed and the weevil populations are low. To resolve this situation, two courses of action are proposed. The first is to mass rear the weevils along the shore of the lagoon and release them when the first seedlings recruit. The second proposal is that additional agents that have shorter lifecycies and are more mobile than the weevils should be released. To this end, the water hyacinth mirid, Eccritotarsus catarinensis (Carvalho) (Hemiptera: Miridae) was imported from South Africa and released onto the Tano Lagoon in 2009. Retrospective laboratory host specificity trials were conducted on Neachetina eichharniae and Neachetina bruchi weevils 15 years after their release into Ghana to see if any variation in their host ranges had occurred. Considerable damage was inflicted on the E. crassipes leaves by the Neachetina weevils, while little feeding damage was recorded on both Heteranthera callifalia Kunth. (Pontederiaceae) and Eichharnia natans (P.Beauv.) Solms (Pontederiaceae). All the weevils introduced on H callifalia and E. natans died after the first week. This study served to confirm the host specificity and thereby the safety of these agents. Invasive alien aquatic macrophytes have negative impacts on the environment and economy of Ghana. The control of these weeds is essential to socioeconomic development and improved human health standards in riparian communities. Biological control offers a safe and sustainable control option, but requires diligent implementation. However, aquatic weed invasion is more typically a result of the anthropogenically induced eutrophication of water bodies, and this is the main issue that has to be addressed.
- Full Text:
- Date Issued: 2012
Risk preferences and consumption decisions in organic production: the case of Kwazulu-Natal and Eastern Cape provinces of South Africa
- Authors: Kisaka-Lwayo, Maggie
- Date: 2012
- Subjects: Food security -- South Africa , Sustainable development -- South Africa , Organic farming -- South Africa , Natural foods industry -- South Africa , Risk management -- South Africa , Consumers -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD (Agricultural Economics)
- Identifier: vital:11188 , http://hdl.handle.net/10353/492 , Food security -- South Africa , Sustainable development -- South Africa , Organic farming -- South Africa , Natural foods industry -- South Africa , Risk management -- South Africa , Consumers -- South Africa
- Description: Despite phenomenal success of the commercial agricultural sector in South Africa and significant progress in integrating smallholders since democratic reforms, food security concerns remain. Recent global increases in food prices have further exacerbated vulnerabilities and made it imperative to examine alternative food production questions in the country. Organic agriculture is identified as one of the sustainable approaches to farming and offers insights towards a paradigm shift in food and nutritional security. Notwithstanding, consumer awareness, knowledge and consumption of organic foods are significantly lower in developing than developed countries. Risks associated with adoption of organic practices need to be explored to address the supply and demand constraints. Similarly, while consumer awareness of organic foods is the first step in developing demand for organic products, it does not necessarily translate to consumption. Therefore it is important to investigate these issues. The objectives of this study were to: (i) describe the demographic and socio-economic characteristics of organic farmers and consumers; (ii) establish the determinants of farmers‘ decision to participate in organic farming distinguishing between the fully-certified organic, partially-certified organic and non-organic farmers; (iii) elicit farmers risk preferences and empirically analyse farmers sources of risk and risk management strategies; (iv) explore consumer awareness, perceptions and attitudes regarding organic products; and (v) identify the factors that influence consumer‘s preference and consumption of organic products. A total of 400 respondents were surveyed, consisting of 200 smallholder farmers in KwaZulu-Natal and 200 consumers in the Eastern Cape. The KwaZulu-Natal study was conducted earlier and identified the following as major sources of risk, lack of consumer awareness of organic products and lack of information among producers about consumer preferences for organic products. This informed the need to undertake a consumer awareness and preference study, in order to inform producers. The Eastern Cape is a bordering province to KwaZulu-Natal with similar socio economic conditions and a major consumer of produce from KwaZulu-Natal. It was also expected that in the intervening period there could have been awareness about the product. An vii indication of its appeal would not be in the consumption of the product by the people who grow it, but by consumers who reside in bordering regions. Producer and household questionnaires were used to record household activities, socio-economic and institutional data as well as household demographics through personal interviews. The Arrow Pratt Absolute Risk Aversion (APARA) coefficient was used to measure the farmer‘s degree of risk aversion and the experimental gambling approach to establish the risk classification. Consumers were also asked about their awareness and knowledge about organics, attitudes and perceptions towards organics, preference and consumption patterns. The ordered probit results indicate that older farmers, who are less risk averse and reside in the sub-ward Ogagwini, Ezigani, and Hwayi were more likely to be certified organic farmers. Similarly, the propensity to adopt organic farming is positively correlated to household size, livestock ownership, asset base and tenure security. The risk analysis indicates that at higher pay-offs most farmers are intermediate to moderately risk-averse, with little variation according to personal characteristics, and that non-organic farmers tend to be more risk averse than fully-certified and partially-certified farmers. In general, price, production and financial risks were perceived as the most important sources of risk. Using Principal Component Analysis (PCA), seven principal components (PCs) explaining 66.13% of the variation were extracted. Socio economic factors having a significant effect on the various sources of risk are age, gender, education, location, information access and risk taking ability. The most important traditional risk management strategies used by the surveyed farmers are crop diversification, precautionary savings and participating in social networks. There was general awareness of what constituted organic foods with many consumers associating organic foods with health and nutrition, chemical free and produced using indigenous methods of production. However, there was low awareness of organic products among consumers with little or no knowledge of organic certification and standards. According to the logit model the major factors influencing consumer awareness of organic products are: gender, education, employment status, and location of the respondents, person/household member responsible for shopping and the price perception of the decision maker. The discriminant analysis showed that the consumption of organic products is significantly affected by age of the consumer, viii location, person/household member responsible for shopping, consumer awareness of organics, price perception and label trust. The findings from this study provides useful practical insights for policy makers, farm advisers and researchers in the design of effective and efficient policies, programmes and projects which can affect the adoption of organic practices, increase smallholder farmers capacity to manage risk and drive growth in the organic food market.
- Full Text:
- Date Issued: 2012
- Authors: Kisaka-Lwayo, Maggie
- Date: 2012
- Subjects: Food security -- South Africa , Sustainable development -- South Africa , Organic farming -- South Africa , Natural foods industry -- South Africa , Risk management -- South Africa , Consumers -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD (Agricultural Economics)
- Identifier: vital:11188 , http://hdl.handle.net/10353/492 , Food security -- South Africa , Sustainable development -- South Africa , Organic farming -- South Africa , Natural foods industry -- South Africa , Risk management -- South Africa , Consumers -- South Africa
- Description: Despite phenomenal success of the commercial agricultural sector in South Africa and significant progress in integrating smallholders since democratic reforms, food security concerns remain. Recent global increases in food prices have further exacerbated vulnerabilities and made it imperative to examine alternative food production questions in the country. Organic agriculture is identified as one of the sustainable approaches to farming and offers insights towards a paradigm shift in food and nutritional security. Notwithstanding, consumer awareness, knowledge and consumption of organic foods are significantly lower in developing than developed countries. Risks associated with adoption of organic practices need to be explored to address the supply and demand constraints. Similarly, while consumer awareness of organic foods is the first step in developing demand for organic products, it does not necessarily translate to consumption. Therefore it is important to investigate these issues. The objectives of this study were to: (i) describe the demographic and socio-economic characteristics of organic farmers and consumers; (ii) establish the determinants of farmers‘ decision to participate in organic farming distinguishing between the fully-certified organic, partially-certified organic and non-organic farmers; (iii) elicit farmers risk preferences and empirically analyse farmers sources of risk and risk management strategies; (iv) explore consumer awareness, perceptions and attitudes regarding organic products; and (v) identify the factors that influence consumer‘s preference and consumption of organic products. A total of 400 respondents were surveyed, consisting of 200 smallholder farmers in KwaZulu-Natal and 200 consumers in the Eastern Cape. The KwaZulu-Natal study was conducted earlier and identified the following as major sources of risk, lack of consumer awareness of organic products and lack of information among producers about consumer preferences for organic products. This informed the need to undertake a consumer awareness and preference study, in order to inform producers. The Eastern Cape is a bordering province to KwaZulu-Natal with similar socio economic conditions and a major consumer of produce from KwaZulu-Natal. It was also expected that in the intervening period there could have been awareness about the product. An vii indication of its appeal would not be in the consumption of the product by the people who grow it, but by consumers who reside in bordering regions. Producer and household questionnaires were used to record household activities, socio-economic and institutional data as well as household demographics through personal interviews. The Arrow Pratt Absolute Risk Aversion (APARA) coefficient was used to measure the farmer‘s degree of risk aversion and the experimental gambling approach to establish the risk classification. Consumers were also asked about their awareness and knowledge about organics, attitudes and perceptions towards organics, preference and consumption patterns. The ordered probit results indicate that older farmers, who are less risk averse and reside in the sub-ward Ogagwini, Ezigani, and Hwayi were more likely to be certified organic farmers. Similarly, the propensity to adopt organic farming is positively correlated to household size, livestock ownership, asset base and tenure security. The risk analysis indicates that at higher pay-offs most farmers are intermediate to moderately risk-averse, with little variation according to personal characteristics, and that non-organic farmers tend to be more risk averse than fully-certified and partially-certified farmers. In general, price, production and financial risks were perceived as the most important sources of risk. Using Principal Component Analysis (PCA), seven principal components (PCs) explaining 66.13% of the variation were extracted. Socio economic factors having a significant effect on the various sources of risk are age, gender, education, location, information access and risk taking ability. The most important traditional risk management strategies used by the surveyed farmers are crop diversification, precautionary savings and participating in social networks. There was general awareness of what constituted organic foods with many consumers associating organic foods with health and nutrition, chemical free and produced using indigenous methods of production. However, there was low awareness of organic products among consumers with little or no knowledge of organic certification and standards. According to the logit model the major factors influencing consumer awareness of organic products are: gender, education, employment status, and location of the respondents, person/household member responsible for shopping and the price perception of the decision maker. The discriminant analysis showed that the consumption of organic products is significantly affected by age of the consumer, viii location, person/household member responsible for shopping, consumer awareness of organics, price perception and label trust. The findings from this study provides useful practical insights for policy makers, farm advisers and researchers in the design of effective and efficient policies, programmes and projects which can affect the adoption of organic practices, increase smallholder farmers capacity to manage risk and drive growth in the organic food market.
- Full Text:
- Date Issued: 2012
A model for automated topic spotting in a mobile chat based mathematics tutoring environment
- Authors: Butgereit, Laura Lee
- Date: 2012
- Subjects: Mobile communication systems in education , Mathematics -- Study and teaching , Tutors and tutoring -- Mathematics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9809 , http://hdl.handle.net/10948/d1013741
- Description: Systems of writing have existed for thousands of years. The history of civilisation and the history of writing are so intertwined that it is hard to separate the one from the other. These systems of writing, however, are not static. They change. One of the latest developments in systems of writing is short electronic messages such as seen on Twitter and in MXit. One novel application which uses these short electronic messages is the Dr Math® project. Dr Math is a mobile online tutoring system where pupils can use MXit on their cell phones and receive help with their mathematics homework from volunteer tutors around the world. These conversations between pupils and tutors are held in MXit lingo or MXit language – this cryptic, abbreviated system 0f ryting w1ch l0ks lyk dis. Project μ (pronounced mu and indicating MXit Understander) investigated how topics could be determined in MXit lingo and Project μ's research outputs spot mathematics topics in conversations between Dr Math tutors and pupils. Once the topics are determined, supporting documentation can be presented to the tutors to assist them in helping pupils with their mathematics homework. Project μ made the following contributions to new knowledge: a statistical and linguistic analysis of MXit lingo provides letter frequencies, word frequencies, message length statistics as well as linguistic bases for new spelling conventions seen in MXit based conversations; a post-stemmer for use with MXit lingo removes suffixes from the ends of words taking into account MXit spelling conventions allowing words such as equashun and equation to be reduced to the same root stem; a list of over ten thousand stop words for MXit lingo appropriate for the domain of mathematics; a misspelling corrector for MXit lingo which corrects words such as acount and equates it to account; and a model for spotting mathematical topics in MXit lingo. The model was instantiated and integrated into the Dr Math tutoring platform. Empirical evidence as to the effectiveness of the μ Topic Spotter and the other contributions is also presented. The empirical evidence includes specific statistical tests with MXit lingo, specific tests of the misspelling corrector, stemmer, and feedback mechanism, and an extensive exercise of content analysis with respect to mathematics topics.
- Full Text:
- Date Issued: 2012
- Authors: Butgereit, Laura Lee
- Date: 2012
- Subjects: Mobile communication systems in education , Mathematics -- Study and teaching , Tutors and tutoring -- Mathematics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9809 , http://hdl.handle.net/10948/d1013741
- Description: Systems of writing have existed for thousands of years. The history of civilisation and the history of writing are so intertwined that it is hard to separate the one from the other. These systems of writing, however, are not static. They change. One of the latest developments in systems of writing is short electronic messages such as seen on Twitter and in MXit. One novel application which uses these short electronic messages is the Dr Math® project. Dr Math is a mobile online tutoring system where pupils can use MXit on their cell phones and receive help with their mathematics homework from volunteer tutors around the world. These conversations between pupils and tutors are held in MXit lingo or MXit language – this cryptic, abbreviated system 0f ryting w1ch l0ks lyk dis. Project μ (pronounced mu and indicating MXit Understander) investigated how topics could be determined in MXit lingo and Project μ's research outputs spot mathematics topics in conversations between Dr Math tutors and pupils. Once the topics are determined, supporting documentation can be presented to the tutors to assist them in helping pupils with their mathematics homework. Project μ made the following contributions to new knowledge: a statistical and linguistic analysis of MXit lingo provides letter frequencies, word frequencies, message length statistics as well as linguistic bases for new spelling conventions seen in MXit based conversations; a post-stemmer for use with MXit lingo removes suffixes from the ends of words taking into account MXit spelling conventions allowing words such as equashun and equation to be reduced to the same root stem; a list of over ten thousand stop words for MXit lingo appropriate for the domain of mathematics; a misspelling corrector for MXit lingo which corrects words such as acount and equates it to account; and a model for spotting mathematical topics in MXit lingo. The model was instantiated and integrated into the Dr Math tutoring platform. Empirical evidence as to the effectiveness of the μ Topic Spotter and the other contributions is also presented. The empirical evidence includes specific statistical tests with MXit lingo, specific tests of the misspelling corrector, stemmer, and feedback mechanism, and an extensive exercise of content analysis with respect to mathematics topics.
- Full Text:
- Date Issued: 2012
Teaching pharmacology: issues of language and learning in a multilingual classroom setting
- Boschmans, Shirley-Anne Inez
- Authors: Boschmans, Shirley-Anne Inez
- Date: 2012
- Subjects: English language -- Study and teaching -- South Africa , Pharmacology -- Terminology , Multicultural education , Second language acquisition
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9562 , http://hdl.handle.net/10948/d1013398
- Description: The medium for teaching and learning in South African universities is not the mother tongue of the majority of students and this has been reported to be a barrier to achievement (Department of Education, 2002). Poor English language skills, as well as poor discipline specific vocabulary knowledge, can lead to poor study techniques with the students resorting to rote learning as they are unable to interpret the recommended texts (Gow, Kember, & Chow, 1991; Shembe, 2002). In 2005 at the NMMU a significant difference was reported between the marks achieved for the Pharmacology 2 (ZCL2) module by English first language (EFL) students and the English second language students (EAL) (Boschmans & McCartney, 2005). These finding provided motivation for this study which interrogates issues of language and learning in a multilingual Pharmacology classroom. A mixed methods approach, which employed a concurrent triangulation design with quantitative dominance, was used. Two parallel studies were undertaken. One consisted of a quasi-experimental, pre-test and post-test control group design using an intervention which consisted of the application of the didactical practice of exploratory talk with an experimental sample group during ZCL2 Supplementary Instruction sessions (SI). A second study involved a parallel data collection from the ZCL303 and ZCL401 Pharmacy students at the NMMU to investigate possible effects of academic progression. Purposive, homogenous sampling was used in selection of the samples. The mean ZCL2 mark for the experimental group (58.70±14.14 percent) of students who experienced the intervention (application of exploratory talk) was significantly higher (p = .0004) than the mark achieved by the ZCL2 comparison group (46.47±14.48). This Abstract difference was of high practical significance (Cohen‟s d = 0.85). This quantitative finding was supported by the qualitative data where the students expressed support for the discussion sessions (application of exploratory talk) held during SI sessions. There was a significant increase, with academic progression, of English reading comprehension amongst the EFL students (p = .025) but not in the EAL students and BPharm1 weighted average (p < .001) as well as SI attendance (p = .02) correlated significantly with achievement in ZCL2. The findings of this study provide insights into the teaching of Pharmacology in a multilingual classroom. The qualitative results in addition to strengthening the quantitative findings through triangulation have provided a rich, deep and detailed description of the lived experiences of Pharmacology students. The data will provide insights into students‟ experiences for Pharmacy academics and are a resource for understanding student perspectives.
- Full Text:
- Date Issued: 2012
- Authors: Boschmans, Shirley-Anne Inez
- Date: 2012
- Subjects: English language -- Study and teaching -- South Africa , Pharmacology -- Terminology , Multicultural education , Second language acquisition
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9562 , http://hdl.handle.net/10948/d1013398
- Description: The medium for teaching and learning in South African universities is not the mother tongue of the majority of students and this has been reported to be a barrier to achievement (Department of Education, 2002). Poor English language skills, as well as poor discipline specific vocabulary knowledge, can lead to poor study techniques with the students resorting to rote learning as they are unable to interpret the recommended texts (Gow, Kember, & Chow, 1991; Shembe, 2002). In 2005 at the NMMU a significant difference was reported between the marks achieved for the Pharmacology 2 (ZCL2) module by English first language (EFL) students and the English second language students (EAL) (Boschmans & McCartney, 2005). These finding provided motivation for this study which interrogates issues of language and learning in a multilingual Pharmacology classroom. A mixed methods approach, which employed a concurrent triangulation design with quantitative dominance, was used. Two parallel studies were undertaken. One consisted of a quasi-experimental, pre-test and post-test control group design using an intervention which consisted of the application of the didactical practice of exploratory talk with an experimental sample group during ZCL2 Supplementary Instruction sessions (SI). A second study involved a parallel data collection from the ZCL303 and ZCL401 Pharmacy students at the NMMU to investigate possible effects of academic progression. Purposive, homogenous sampling was used in selection of the samples. The mean ZCL2 mark for the experimental group (58.70±14.14 percent) of students who experienced the intervention (application of exploratory talk) was significantly higher (p = .0004) than the mark achieved by the ZCL2 comparison group (46.47±14.48). This Abstract difference was of high practical significance (Cohen‟s d = 0.85). This quantitative finding was supported by the qualitative data where the students expressed support for the discussion sessions (application of exploratory talk) held during SI sessions. There was a significant increase, with academic progression, of English reading comprehension amongst the EFL students (p = .025) but not in the EAL students and BPharm1 weighted average (p < .001) as well as SI attendance (p = .02) correlated significantly with achievement in ZCL2. The findings of this study provide insights into the teaching of Pharmacology in a multilingual classroom. The qualitative results in addition to strengthening the quantitative findings through triangulation have provided a rich, deep and detailed description of the lived experiences of Pharmacology students. The data will provide insights into students‟ experiences for Pharmacy academics and are a resource for understanding student perspectives.
- Full Text:
- Date Issued: 2012
An investigation of strategies used by Ndebele translators in Zimbabwe in translating HIV/AIDS texts: a corpus-based approach
- Authors: Ndhlovu, Ketiwe
- Date: 2012
- Subjects: Translating and interpreting -- Zimbabwe , Corpora (Linguistics) , Culture -- Study and teaching -- Zimbabwe , Translators -- Zimbabwe , HIV infections -- Zimbabwe , AIDS (Disease) -- Zimbabwe , Taboo, Linguistic , Ndebele (African people) -- Social life and customs
- Language: English
- Type: Thesis , Doctoral , PhD (African Languages)
- Identifier: vital:11149 , http://hdl.handle.net/10353/524 , Translating and interpreting -- Zimbabwe , Corpora (Linguistics) , Culture -- Study and teaching -- Zimbabwe , Translators -- Zimbabwe , HIV infections -- Zimbabwe , AIDS (Disease) -- Zimbabwe , Taboo, Linguistic , Ndebele (African people) -- Social life and customs
- Description: In Zimbabwe, translation studies is yet to be recognized as a discipline worthy of study in its own right, hence, not much research has been carried out into the theory and practice of translation. Furthermore, there is no tertiary institution that offers professional translation courses. In light of this information most translations are carried out by untrained/partially trained translators with only a few translators who have gained experience over time. The aim of this study was to investigate strategies used by Ndebele translators in the translation of specialized terms and cultural taboos in selected HIV/AIDS texts, as well as factors that can be used to improve the translation situation of Zimbabwe. Three main theoretical approaches were used in a complementary fashion, namely Descriptive Translation Studies (DTS), Cultural Studies and Corpus-based Translation Studies (CTS). DTS provided the researcher with a theory to understand the Ndebele translations in their wider environment; Cultural Studies provided the researcher with the means by which to understand Ndebele culture and taboos; Corpus-based Translation Studies (CTS) provided the researcher with the methodological tools and analytical techniques to analyse the corpus of texts. An English-Ndebele Parallel Corpus (ENPC) was created using fourteen English source texts and their corresponding Ndebele translations. The ENPC was interrogated by means of ParaConc, a parallel concordancing program. The study found that when translating specialised terms, Ndebele translators used strategies such as a general or neutral word, cultural substitution, paraphrasing and omission. The strategy of omission was misused in most cases because Ndebele translators omitted valuable information which did not reach the target readers. With regards to translation strategies that contributed to term creation, it was found that Ndebele translators relied on external as well as internal resources. The translators used strategies such as pure loan words; pure loan words preceeded by an explanation and indigenised loan words. From the Ndebele language itself, the translators resorted to semantic shift, compounding, coinage and paraphrasing, among others. From the ENPC it is clear that Ndebele translators did manage to transfer the message from English to Ndebele to an extent. However, the ENPC has to be used with caution by other researchers since the translations included in the corpus are full of errors such as misinterpretations of the source texts, mistranslations, incorrect terms and incorrect orthography. This factor points to a dire need to establish translation as an academic discipline and profession in Zimbabwe so as to elevate the quality of translations and offer better translation services to all users.
- Full Text:
- Date Issued: 2012
- Authors: Ndhlovu, Ketiwe
- Date: 2012
- Subjects: Translating and interpreting -- Zimbabwe , Corpora (Linguistics) , Culture -- Study and teaching -- Zimbabwe , Translators -- Zimbabwe , HIV infections -- Zimbabwe , AIDS (Disease) -- Zimbabwe , Taboo, Linguistic , Ndebele (African people) -- Social life and customs
- Language: English
- Type: Thesis , Doctoral , PhD (African Languages)
- Identifier: vital:11149 , http://hdl.handle.net/10353/524 , Translating and interpreting -- Zimbabwe , Corpora (Linguistics) , Culture -- Study and teaching -- Zimbabwe , Translators -- Zimbabwe , HIV infections -- Zimbabwe , AIDS (Disease) -- Zimbabwe , Taboo, Linguistic , Ndebele (African people) -- Social life and customs
- Description: In Zimbabwe, translation studies is yet to be recognized as a discipline worthy of study in its own right, hence, not much research has been carried out into the theory and practice of translation. Furthermore, there is no tertiary institution that offers professional translation courses. In light of this information most translations are carried out by untrained/partially trained translators with only a few translators who have gained experience over time. The aim of this study was to investigate strategies used by Ndebele translators in the translation of specialized terms and cultural taboos in selected HIV/AIDS texts, as well as factors that can be used to improve the translation situation of Zimbabwe. Three main theoretical approaches were used in a complementary fashion, namely Descriptive Translation Studies (DTS), Cultural Studies and Corpus-based Translation Studies (CTS). DTS provided the researcher with a theory to understand the Ndebele translations in their wider environment; Cultural Studies provided the researcher with the means by which to understand Ndebele culture and taboos; Corpus-based Translation Studies (CTS) provided the researcher with the methodological tools and analytical techniques to analyse the corpus of texts. An English-Ndebele Parallel Corpus (ENPC) was created using fourteen English source texts and their corresponding Ndebele translations. The ENPC was interrogated by means of ParaConc, a parallel concordancing program. The study found that when translating specialised terms, Ndebele translators used strategies such as a general or neutral word, cultural substitution, paraphrasing and omission. The strategy of omission was misused in most cases because Ndebele translators omitted valuable information which did not reach the target readers. With regards to translation strategies that contributed to term creation, it was found that Ndebele translators relied on external as well as internal resources. The translators used strategies such as pure loan words; pure loan words preceeded by an explanation and indigenised loan words. From the Ndebele language itself, the translators resorted to semantic shift, compounding, coinage and paraphrasing, among others. From the ENPC it is clear that Ndebele translators did manage to transfer the message from English to Ndebele to an extent. However, the ENPC has to be used with caution by other researchers since the translations included in the corpus are full of errors such as misinterpretations of the source texts, mistranslations, incorrect terms and incorrect orthography. This factor points to a dire need to establish translation as an academic discipline and profession in Zimbabwe so as to elevate the quality of translations and offer better translation services to all users.
- Full Text:
- Date Issued: 2012
Strategies for sustainable housing co-operatives in South Africa
- Authors: Jimoh, Richard Ajayi
- Date: 2012
- Subjects: Housing, Cooperative -- South Africa , Housing -- South Africa , Sustainable development -- South Africa , Housing -- Finance-- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9690 , http://hdl.handle.net/10948/d1009500 , Housing, Cooperative -- South Africa , Housing -- South Africa , Sustainable development -- South Africa , Housing -- Finance-- South Africa
- Description: An increasing number of people are in need of housing that would improve long-term tenure for them. Private ownership is a well-known incentive for peoples’ participation in housing programmes. The current difficulties in obtaining credit for housing, following the global economic crisis, show that private individual home-ownership is not effective enough in addressing the housing needs of the low and middle income groups. As a result of this, the need to find an option that will solve the housing needs of the people became intense. However, the implementation of the co-operative housing delivery option in South Africa has not been successfully implemented as a result of the actions or the inactions of the role players. The study sought answer to the causes of the inability to successfully implement the co-operative housing approach through the use of ‘triad model’ that has to do with the ideology of co-operatives, the praxis and the organisational structures of the various housing co-operatives. The study was domiciled in a pragmatic paradigm, using the mixed methods research approach by conducting a three-stage research whereby convergent parallel design was adopted as the methodology. Questionnaires were administered to the chairpersons of the housing co-operatives identified in this stage one of the study. Stage two consisted of conducting interviews with chairpersons of six housing co-operatives using the purposive non-probability sampling method. The final stage was the survey among the members of the housing co-operatives interviewed. It was discovered, inter alia, that the membership of housing co-operatives was not voluntary; policy and legislative documents on social housing were biased against the co-operative housing approach; limited understanding of the co-operative approach exists among officials of government responsible for the implementations and a lack of training to members of the housing co-operatives by agencies of government responsible for propagating the approach was evident. Based on the findings, framework for sustainable housing co-operatives in South Africa was proposed from the strategies identified. The strategies identified were classified into the following factors: Policy and legislation; support services; education, training and information; and governance.
- Full Text:
- Date Issued: 2012
- Authors: Jimoh, Richard Ajayi
- Date: 2012
- Subjects: Housing, Cooperative -- South Africa , Housing -- South Africa , Sustainable development -- South Africa , Housing -- Finance-- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9690 , http://hdl.handle.net/10948/d1009500 , Housing, Cooperative -- South Africa , Housing -- South Africa , Sustainable development -- South Africa , Housing -- Finance-- South Africa
- Description: An increasing number of people are in need of housing that would improve long-term tenure for them. Private ownership is a well-known incentive for peoples’ participation in housing programmes. The current difficulties in obtaining credit for housing, following the global economic crisis, show that private individual home-ownership is not effective enough in addressing the housing needs of the low and middle income groups. As a result of this, the need to find an option that will solve the housing needs of the people became intense. However, the implementation of the co-operative housing delivery option in South Africa has not been successfully implemented as a result of the actions or the inactions of the role players. The study sought answer to the causes of the inability to successfully implement the co-operative housing approach through the use of ‘triad model’ that has to do with the ideology of co-operatives, the praxis and the organisational structures of the various housing co-operatives. The study was domiciled in a pragmatic paradigm, using the mixed methods research approach by conducting a three-stage research whereby convergent parallel design was adopted as the methodology. Questionnaires were administered to the chairpersons of the housing co-operatives identified in this stage one of the study. Stage two consisted of conducting interviews with chairpersons of six housing co-operatives using the purposive non-probability sampling method. The final stage was the survey among the members of the housing co-operatives interviewed. It was discovered, inter alia, that the membership of housing co-operatives was not voluntary; policy and legislative documents on social housing were biased against the co-operative housing approach; limited understanding of the co-operative approach exists among officials of government responsible for the implementations and a lack of training to members of the housing co-operatives by agencies of government responsible for propagating the approach was evident. Based on the findings, framework for sustainable housing co-operatives in South Africa was proposed from the strategies identified. The strategies identified were classified into the following factors: Policy and legislation; support services; education, training and information; and governance.
- Full Text:
- Date Issued: 2012
Development of corona-based power supplies for remote repeater stations for overhead HVDC power transmission systems
- Authors: Kaseke, R
- Date: 2012
- Language: English
- Type: Thesis , Doctoral , PhD (Physics)
- Identifier: vital:11595 , http://hdl.handle.net/10353/d1006787
- Description: More and more people worldwide are becoming “carbon conscious”. This means they are becoming increasingly aware of the imminent adverse effects of global warming. Of late there has been an urgent drive for governments to be on the forefront of all carbon mitigation initiatives. One such drive involves the United Nations Framework Convention on Climate Change whose parties have been meeting regularly under the banner of Conference of Parties (COP) since 1995. At this conference, parties to the convention review progress made in dealing with climate change. Also key to the deliberations in such meetings are better ways of developing cleaner “carbon free” energy sources. Energy sources of this nature are commonly known as renewable energy sources. In essence global energy trends are constantly moving towards development of more renewable energy sources. It is an undeniable fact that some of viable renewable energy sources especially those with bulk capacity are usually located remotely from load centers. This inevitable reality necessitates the construction of long distance bulk power transmission corridors to link generation sites with load centers. Due to its many inherent advantages over High Voltage Alternate Current (HVAC) for long distance power transmission, High Voltage Direct Current (HVDC) is gradually winning the favor of many utilities. In fact, recent advances in HVDC technology have encouraged many utilities to explore the possibility of harnessing remotely located renewable energy sources which would have otherwise not been viable with HVAC transmission. Through the unfortunate and inevitable phenomenon known as corona effect, overhead HVDC conductors suffer real power losses to the air dielectric surrounding them. Through corona, part of the energy carried on the transmission line is expended through ionization and movement of charges in the air dielectric. This study combined physics, mathematical as well engineering concepts to review corona phenomenon around HVDC lines with specific emphasis on space charge generation and motion within ionized DC fields as well as the influence of temperature on corona discharge or power loss. Also, unlike HVAC, performance of an HVDC system relies heavily on the availability of a reliable and robust telecommunication system. One of the key ways of ensuring reliability of a telecommunication system is by making sure that reliable power supplies are in place to power remote repeater stations. A novel concept of quasi-autonomous corona-based power supply (or QC power supply in short) that works on the principle of magnetohydrodymic (MHD) power generation was developed. A small scale experiment was then designed to assess the feasibility of such power supplies. The experiment was conducted with DC supply of a maximum rated voltage of 30 kVDC and generated up to 6 VDC at an optimum ambient temperature of 23°C. These results have confirmed that with further development QC power supplies have the potential of proving reliable power to remotely located repeaters or any other small critical loads along the stretch of the HVDC transmission line. Practical HVDC transmission systems operate voltages in the excess of 500 kV. By linear extrapolation of the above mentioned results; one would expect to yield up to 100-, 120- and 160-VDC from a 500-, 600- and 800- kV HVDC system, respectively. Although the study succeeded in conceptualizing a CMHD idea upon which the novel QC power supply was developed, quite extensive and rigorous design, modeling, prototyping and experimentation processes are still required before the first QC power supply can be commissioned on a practical HVDC line
- Full Text:
- Date Issued: 2012
- Authors: Kaseke, R
- Date: 2012
- Language: English
- Type: Thesis , Doctoral , PhD (Physics)
- Identifier: vital:11595 , http://hdl.handle.net/10353/d1006787
- Description: More and more people worldwide are becoming “carbon conscious”. This means they are becoming increasingly aware of the imminent adverse effects of global warming. Of late there has been an urgent drive for governments to be on the forefront of all carbon mitigation initiatives. One such drive involves the United Nations Framework Convention on Climate Change whose parties have been meeting regularly under the banner of Conference of Parties (COP) since 1995. At this conference, parties to the convention review progress made in dealing with climate change. Also key to the deliberations in such meetings are better ways of developing cleaner “carbon free” energy sources. Energy sources of this nature are commonly known as renewable energy sources. In essence global energy trends are constantly moving towards development of more renewable energy sources. It is an undeniable fact that some of viable renewable energy sources especially those with bulk capacity are usually located remotely from load centers. This inevitable reality necessitates the construction of long distance bulk power transmission corridors to link generation sites with load centers. Due to its many inherent advantages over High Voltage Alternate Current (HVAC) for long distance power transmission, High Voltage Direct Current (HVDC) is gradually winning the favor of many utilities. In fact, recent advances in HVDC technology have encouraged many utilities to explore the possibility of harnessing remotely located renewable energy sources which would have otherwise not been viable with HVAC transmission. Through the unfortunate and inevitable phenomenon known as corona effect, overhead HVDC conductors suffer real power losses to the air dielectric surrounding them. Through corona, part of the energy carried on the transmission line is expended through ionization and movement of charges in the air dielectric. This study combined physics, mathematical as well engineering concepts to review corona phenomenon around HVDC lines with specific emphasis on space charge generation and motion within ionized DC fields as well as the influence of temperature on corona discharge or power loss. Also, unlike HVAC, performance of an HVDC system relies heavily on the availability of a reliable and robust telecommunication system. One of the key ways of ensuring reliability of a telecommunication system is by making sure that reliable power supplies are in place to power remote repeater stations. A novel concept of quasi-autonomous corona-based power supply (or QC power supply in short) that works on the principle of magnetohydrodymic (MHD) power generation was developed. A small scale experiment was then designed to assess the feasibility of such power supplies. The experiment was conducted with DC supply of a maximum rated voltage of 30 kVDC and generated up to 6 VDC at an optimum ambient temperature of 23°C. These results have confirmed that with further development QC power supplies have the potential of proving reliable power to remotely located repeaters or any other small critical loads along the stretch of the HVDC transmission line. Practical HVDC transmission systems operate voltages in the excess of 500 kV. By linear extrapolation of the above mentioned results; one would expect to yield up to 100-, 120- and 160-VDC from a 500-, 600- and 800- kV HVDC system, respectively. Although the study succeeded in conceptualizing a CMHD idea upon which the novel QC power supply was developed, quite extensive and rigorous design, modeling, prototyping and experimentation processes are still required before the first QC power supply can be commissioned on a practical HVDC line
- Full Text:
- Date Issued: 2012
Knowledge retention strategies in selected Southern Africa public broadcasting corporations
- Authors: Dewah, Peterson
- Date: 2012
- Subjects: Knowledge management , Intellectual capital -- Management , Employee retention , Broadcasting -- South Africa , Broadcasting -- Zimbabwe , Broadcasting -- Botswana
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:11572 , http://hdl.handle.net/10353/438 , Knowledge management , Intellectual capital -- Management , Employee retention , Broadcasting -- South Africa , Broadcasting -- Zimbabwe , Broadcasting -- Botswana
- Description: Knowledge is now regarded as the most important resource surpassing other resources like land and capital. It is a foregone conclusion that knowledge flows out of organizations through various ways such as resignations, retirement and death yet, it does not seem as if organizations are employing strategies to retain such a vital component of production and service delivery. This study investigated the knowledge retention strategies in three Southern Africa Development Community (SADC) public broadcasting organizations of the South African Broadcasting Corporation in South African (SABC), the Department of Broadcasting Services (DBS) in Botswana and the Zimbabwe Broadcasting Corporation (ZBC) in Zimbabwe. The aim of this study was to establish how knowledge is captured and retained at such organizations. The objectives of the study were; to find out the types of strategies the three broadcasting organizations employ to capture and retain knowledge; establish how the three broadcasting organizational cultures enable knowledge acquisition, transfer, sharing and retention; establish the role of ICTs as tools and enablers of knowledge retention, creation, transfer and sharing in the three broadcasting organizations; and to propose recommendations on the best strategies for retention of knowledge in the three public broadcasting organizations as well as suggest areas for further and future research. v The study used the survey method and employed the triangulation design for data gathering. Data were collected from three SADC public broadcasting organizations. The population sample comprised 240 professional staff including 38 managers from different sections of the broadcasting organizations. The researcher collected data by administering a questionnaire to staff, interviews with managers and observations. Documentary analysis was also conducted in order to supplement data and fill in gaps. The researcher was mainly interested in gathering data that would give a comprehensive picture about knowledge retention methods in broadcasting organizations. There were four main findings. First, knowledge management as a relatively new concept and practice has not yet been properly embraced in the public broadcasting organization system in order to capture and retain knowledge that is acquired and generated in the organizations. There are no measures put in place in the organizations to retain the knowledge to ensure that once those who hold vital tacit knowledge are gone, the knowledge may still be available and accessible. Second, the study established that the respective organizational cultures impede on organizational knowledge retention. The study established that there was no culture of knowledge sharing. It also emerged that employees were not free to share their knowledge because of government regulations, prevailing political contexts, mistrust and general lack of incentive to share knowledge. Third, the study established that the organizations have no strategies or systems in place to capture the experts‟ knowledge or the knowledge of experienced staff and vi those approaching retiring age. The Human Resources Departments hold exit interviews that cover issues purely to do with why the person is leaving the organization instead of recording the work experiences and expertise of the departing employees. Fourth, the study revealed that the public broadcasting organizations still lag behind in collaborative and communicative technologies that facilitate knowledge transfer and sharing of tacit knowledge but retention of knowledge generally. The study also found that, some of the organizations studied did not have internet connectivity and websites were not yet functional, which hampered acquisition and sharing of knowledge for retention purposes. The importance of this study is that it has made a contribution and provided literature on knowledge retention strategies for public broadcasting corporations as part of knowledge management practice. On the basis of these findings the study recommended the following: appointment of knowledge management officers, establishment of Communities of Practice, encouraging knowledge sharing between employees, introduction of joint programmes with other broadcasting organizations by managers and their supervision of mentoring programmes; organizations to facilitate acquisition of information and communication technologies that enable knowledge management
- Full Text:
- Date Issued: 2012
- Authors: Dewah, Peterson
- Date: 2012
- Subjects: Knowledge management , Intellectual capital -- Management , Employee retention , Broadcasting -- South Africa , Broadcasting -- Zimbabwe , Broadcasting -- Botswana
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:11572 , http://hdl.handle.net/10353/438 , Knowledge management , Intellectual capital -- Management , Employee retention , Broadcasting -- South Africa , Broadcasting -- Zimbabwe , Broadcasting -- Botswana
- Description: Knowledge is now regarded as the most important resource surpassing other resources like land and capital. It is a foregone conclusion that knowledge flows out of organizations through various ways such as resignations, retirement and death yet, it does not seem as if organizations are employing strategies to retain such a vital component of production and service delivery. This study investigated the knowledge retention strategies in three Southern Africa Development Community (SADC) public broadcasting organizations of the South African Broadcasting Corporation in South African (SABC), the Department of Broadcasting Services (DBS) in Botswana and the Zimbabwe Broadcasting Corporation (ZBC) in Zimbabwe. The aim of this study was to establish how knowledge is captured and retained at such organizations. The objectives of the study were; to find out the types of strategies the three broadcasting organizations employ to capture and retain knowledge; establish how the three broadcasting organizational cultures enable knowledge acquisition, transfer, sharing and retention; establish the role of ICTs as tools and enablers of knowledge retention, creation, transfer and sharing in the three broadcasting organizations; and to propose recommendations on the best strategies for retention of knowledge in the three public broadcasting organizations as well as suggest areas for further and future research. v The study used the survey method and employed the triangulation design for data gathering. Data were collected from three SADC public broadcasting organizations. The population sample comprised 240 professional staff including 38 managers from different sections of the broadcasting organizations. The researcher collected data by administering a questionnaire to staff, interviews with managers and observations. Documentary analysis was also conducted in order to supplement data and fill in gaps. The researcher was mainly interested in gathering data that would give a comprehensive picture about knowledge retention methods in broadcasting organizations. There were four main findings. First, knowledge management as a relatively new concept and practice has not yet been properly embraced in the public broadcasting organization system in order to capture and retain knowledge that is acquired and generated in the organizations. There are no measures put in place in the organizations to retain the knowledge to ensure that once those who hold vital tacit knowledge are gone, the knowledge may still be available and accessible. Second, the study established that the respective organizational cultures impede on organizational knowledge retention. The study established that there was no culture of knowledge sharing. It also emerged that employees were not free to share their knowledge because of government regulations, prevailing political contexts, mistrust and general lack of incentive to share knowledge. Third, the study established that the organizations have no strategies or systems in place to capture the experts‟ knowledge or the knowledge of experienced staff and vi those approaching retiring age. The Human Resources Departments hold exit interviews that cover issues purely to do with why the person is leaving the organization instead of recording the work experiences and expertise of the departing employees. Fourth, the study revealed that the public broadcasting organizations still lag behind in collaborative and communicative technologies that facilitate knowledge transfer and sharing of tacit knowledge but retention of knowledge generally. The study also found that, some of the organizations studied did not have internet connectivity and websites were not yet functional, which hampered acquisition and sharing of knowledge for retention purposes. The importance of this study is that it has made a contribution and provided literature on knowledge retention strategies for public broadcasting corporations as part of knowledge management practice. On the basis of these findings the study recommended the following: appointment of knowledge management officers, establishment of Communities of Practice, encouraging knowledge sharing between employees, introduction of joint programmes with other broadcasting organizations by managers and their supervision of mentoring programmes; organizations to facilitate acquisition of information and communication technologies that enable knowledge management
- Full Text:
- Date Issued: 2012
A model to promote entrepreneurial competitiveness in the South African telecommunications sector
- Oberholzer, Stephanus Marius
- Authors: Oberholzer, Stephanus Marius
- Date: 2012
- Subjects: Telecommunication -- Planning -- South Africa , Business planning -- South Africa , Business enterprises -- South Africa , Entrepreneurship
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: vital:8769 , http://hdl.handle.net/10948/d1012150 , Telecommunication -- Planning -- South Africa , Business planning -- South Africa , Business enterprises -- South Africa , Entrepreneurship
- Description: The fast pace of technological advancements is a driver of change in the world. In telecommunications, advancements as well as sector transformation pose challenges to entrepreneurs to remain competitive. The purpose of this study is to contribute to the promotion of entrepreneurial competitiveness in the telecommunications sector in South Africa. In order to achieve this purpose, the objective was to develop and test a theoretical model to promote entrepreneurial competitiveness in this sector. The purpose of the study was that if the factors that influence entrepreneurial businesses in this sector can be identified and recommendations applied, the competitiveness of these businesses can be improved. The approach was as follows: 1. Identify the factors, in a literature review, in three areas related to this study, namely, Entrepreneurial Orientation, Telecommunications and Benchmarking; 2. Develop a conceptual theoretical model comprising these identified factors which formed the base for the data collection; 3. Develop a measuring instrument to empirically test the relationships described in the conceptual model; 4. Empirically test the proposed model and suggested hypotheses by means of sourcing data from entrepreneurs in the telecommunications sector in South Africa and thereafter statistically analyse the sourced data; 5. Formulate the final theoretical model to support the research objective and 6. Propose recommendations based on the results of the statistical analysis. The three areas of literature study analysed were Entrepreneurial Orientation which focused on the entrepreneur, the entrepreneurial process and the positioning of technological entrepreneurs in the sector. The telecommunications section included an overview of telecommunications from a global perspective followed by specific focus on the South African sector. The section on benchmarking covered business performance aspects together with measurement techniques and benchmarking institutions relevant to entrepreneurship and telecommunications businesses. Initially, the literature study delivered four intervening variables (Entrepreneurial Orientation, Opportunity Recognition, Resource Allocation and Strategic Positioning) which influence entrepreneurial competitiveness. Within these four intervening variables, twelve underlying independent variables were identified. All the variables were hypothesised as they were perceived significantly to influence the dependent variable, perceived to be entrepreneurial competitiveness in the telecommunications sector in South Africa. These factors, clearly defined and operationalised, were structured in a questionnaire which was sent to entrepreneurs in the telecommunications sector. A response rate of 37 percent was achieved. Data collected from 301 questionnaires were subjected to various statistical analysis techniques. Cronbach-alpha coefficients were calculated to confirm the validity and reliability of the measuring instrument that was tested whilst the latent variables were confirmed by exploratory factor analysis. Structural Equation Modelling (SEM) was used to test the hypothesised significance of the relationships between the variables. Due to the sample size limitation, the conceptual model could not be subjected to SEM as a whole and consequently two sub-models were identified and subjected to further analysis. The SEM results presented the factors influencing entrepreneurial competitiveness whereafter the final model was presented for this study. This study contributed to this specific field of knowledge as follows: 1. New literature contributions are made in the field of entrepreneurial competitiveness in a specific sector; 2. It is the first known research conducted into the promotion of entrepreneurial competitiveness in the telecommunications sector in South Africa; 3. A theoretical model was developed that can be used to promote entrepreneurial competitiveness in the sector and 4. It suggests recommendations on empirically tested factors that significantly influence entrepreneurial competitiveness. Additional knowledge has been gained through the identification and description of how the following individual factors significantly influence entrepreneurial competitiveness in this sector: Benchmarking; Entrepreneurial Mindset; Entrepreneurial Management; Entrepreneurial Orientation; Financial Resources; Infrastructural Change; Regulatory Alignment and Technological Entrepreneurship. The present study was conducted in a time frame where sector transformation is prevalent in South Africa. The current circumstances relating to sector transformation and infrastructural changes will not last forever. The theoretical model therefore is limited to the specific sector conditions in a specific time cycle. In conclusion, the model and managerial recommendations that are presented can act as a guideline for entrepreneurs to adopt in order to improve the competitiveness of their businesses.
- Full Text:
- Date Issued: 2012
- Authors: Oberholzer, Stephanus Marius
- Date: 2012
- Subjects: Telecommunication -- Planning -- South Africa , Business planning -- South Africa , Business enterprises -- South Africa , Entrepreneurship
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: vital:8769 , http://hdl.handle.net/10948/d1012150 , Telecommunication -- Planning -- South Africa , Business planning -- South Africa , Business enterprises -- South Africa , Entrepreneurship
- Description: The fast pace of technological advancements is a driver of change in the world. In telecommunications, advancements as well as sector transformation pose challenges to entrepreneurs to remain competitive. The purpose of this study is to contribute to the promotion of entrepreneurial competitiveness in the telecommunications sector in South Africa. In order to achieve this purpose, the objective was to develop and test a theoretical model to promote entrepreneurial competitiveness in this sector. The purpose of the study was that if the factors that influence entrepreneurial businesses in this sector can be identified and recommendations applied, the competitiveness of these businesses can be improved. The approach was as follows: 1. Identify the factors, in a literature review, in three areas related to this study, namely, Entrepreneurial Orientation, Telecommunications and Benchmarking; 2. Develop a conceptual theoretical model comprising these identified factors which formed the base for the data collection; 3. Develop a measuring instrument to empirically test the relationships described in the conceptual model; 4. Empirically test the proposed model and suggested hypotheses by means of sourcing data from entrepreneurs in the telecommunications sector in South Africa and thereafter statistically analyse the sourced data; 5. Formulate the final theoretical model to support the research objective and 6. Propose recommendations based on the results of the statistical analysis. The three areas of literature study analysed were Entrepreneurial Orientation which focused on the entrepreneur, the entrepreneurial process and the positioning of technological entrepreneurs in the sector. The telecommunications section included an overview of telecommunications from a global perspective followed by specific focus on the South African sector. The section on benchmarking covered business performance aspects together with measurement techniques and benchmarking institutions relevant to entrepreneurship and telecommunications businesses. Initially, the literature study delivered four intervening variables (Entrepreneurial Orientation, Opportunity Recognition, Resource Allocation and Strategic Positioning) which influence entrepreneurial competitiveness. Within these four intervening variables, twelve underlying independent variables were identified. All the variables were hypothesised as they were perceived significantly to influence the dependent variable, perceived to be entrepreneurial competitiveness in the telecommunications sector in South Africa. These factors, clearly defined and operationalised, were structured in a questionnaire which was sent to entrepreneurs in the telecommunications sector. A response rate of 37 percent was achieved. Data collected from 301 questionnaires were subjected to various statistical analysis techniques. Cronbach-alpha coefficients were calculated to confirm the validity and reliability of the measuring instrument that was tested whilst the latent variables were confirmed by exploratory factor analysis. Structural Equation Modelling (SEM) was used to test the hypothesised significance of the relationships between the variables. Due to the sample size limitation, the conceptual model could not be subjected to SEM as a whole and consequently two sub-models were identified and subjected to further analysis. The SEM results presented the factors influencing entrepreneurial competitiveness whereafter the final model was presented for this study. This study contributed to this specific field of knowledge as follows: 1. New literature contributions are made in the field of entrepreneurial competitiveness in a specific sector; 2. It is the first known research conducted into the promotion of entrepreneurial competitiveness in the telecommunications sector in South Africa; 3. A theoretical model was developed that can be used to promote entrepreneurial competitiveness in the sector and 4. It suggests recommendations on empirically tested factors that significantly influence entrepreneurial competitiveness. Additional knowledge has been gained through the identification and description of how the following individual factors significantly influence entrepreneurial competitiveness in this sector: Benchmarking; Entrepreneurial Mindset; Entrepreneurial Management; Entrepreneurial Orientation; Financial Resources; Infrastructural Change; Regulatory Alignment and Technological Entrepreneurship. The present study was conducted in a time frame where sector transformation is prevalent in South Africa. The current circumstances relating to sector transformation and infrastructural changes will not last forever. The theoretical model therefore is limited to the specific sector conditions in a specific time cycle. In conclusion, the model and managerial recommendations that are presented can act as a guideline for entrepreneurs to adopt in order to improve the competitiveness of their businesses.
- Full Text:
- Date Issued: 2012
A critical realist exploration of the implementation of a new curriculum in Swaziland
- Authors: Pereira, Liphie
- Date: 2012
- Subjects: Critical realism Education -- Philosophy Critical pedagogy -- Swaziland Curriculum change -- Swaziland Education -- Swaziland Education and state -- Swaziland Education -- Aims and objectives -- Swaziland Critical discourse analysis International General Certificate of Secondary Education
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1484 , http://hdl.handle.net/10962/d1003365
- Description: This study offers an in-depth exploration of the conditions from which the implementation of a curriculum called the International General Certificate of Secondary Education (IGCSE), later localised into Swaziland General Certificate of Secondary Education (SGCSE), emerged and the constraining and enabling conditions for the implementation of the new I/SGCSE curriculum. It derives its theoretical foundation from Roy Bhaskar’s critical realism and Margaret Archer’s concept of analytical separability. The study therefore offers explanations about the curriculum change and its implementation that are based on how structural, cultural, and agential mechanisms operating at a deeper level of reality (the intransitive layer of reality or the domain of the real) and existing independently of what we see, know or believe of them (the transitive layer of reality or domains of the actual and empirical) interacted to condition the emergence of I/SGCSE and the way it is implemented. I conduct a critical discourse analysis of relevant literature, I/SGCSE documents and interview data in order to identify those mechanisms that were cultural and also those that were structural and agential. Bernstein’s concepts of classification and framing are used to analyse observation data in order to explore the influence of these mechanisms on the teaching practices of the teachers who took part in the study. Analysis of the data suggests that the change from General Certificate of Education Ordinary Level (GCE O-level) to I/SGCSE was conditioned by inconsistencies between the cultural and structural mechanisms of the Swazi context. Many of the cultural elements of the Swazi context such as the discourses of good citizens, of competitive advantage, and of quality education draw from global discourses which view relations between people from a postmodernist position and therefore support weakly classified and framed pedagogic practices. In contrast, the discourse of morality and many of the structural elements of the Swazi context, such as the pre2006 education system and the Tinkhundla government system, all view reality from a modernist position, therefore supporting strong relations of power and control. The cultural system therefore exerted more influence in conditioning the change from the strongly classified and framed GCE O-level curriculum to the weakly classified and framed I/SGCSE curriculum. Furthermore, the analysis of interview and observation data suggests that inconsistencies between the global discourses and the discourses and structures that teachers confront in their day-to-day lives, together with the decisions teachers made in response to structural constraints, created constraining conditions for the change from GCE O-level to I/SGCSE. The study adds to knowledge on curriculum change and implementation through insights into the enabling and constraining effects of mechanisms operating at a deeper level of reality on curriculum-change decisions and on the ability of teachers to implement curriculum changes. The focus on the deeper level of reality may therefore contribute towards emancipatory knowledge which could be used not only by the Ministry of Education and Training and teachers in Swaziland but also elsewhere to inform future planning, decision making, and practice in relation to curriculum change and implementation.
- Full Text:
- Date Issued: 2012
- Authors: Pereira, Liphie
- Date: 2012
- Subjects: Critical realism Education -- Philosophy Critical pedagogy -- Swaziland Curriculum change -- Swaziland Education -- Swaziland Education and state -- Swaziland Education -- Aims and objectives -- Swaziland Critical discourse analysis International General Certificate of Secondary Education
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1484 , http://hdl.handle.net/10962/d1003365
- Description: This study offers an in-depth exploration of the conditions from which the implementation of a curriculum called the International General Certificate of Secondary Education (IGCSE), later localised into Swaziland General Certificate of Secondary Education (SGCSE), emerged and the constraining and enabling conditions for the implementation of the new I/SGCSE curriculum. It derives its theoretical foundation from Roy Bhaskar’s critical realism and Margaret Archer’s concept of analytical separability. The study therefore offers explanations about the curriculum change and its implementation that are based on how structural, cultural, and agential mechanisms operating at a deeper level of reality (the intransitive layer of reality or the domain of the real) and existing independently of what we see, know or believe of them (the transitive layer of reality or domains of the actual and empirical) interacted to condition the emergence of I/SGCSE and the way it is implemented. I conduct a critical discourse analysis of relevant literature, I/SGCSE documents and interview data in order to identify those mechanisms that were cultural and also those that were structural and agential. Bernstein’s concepts of classification and framing are used to analyse observation data in order to explore the influence of these mechanisms on the teaching practices of the teachers who took part in the study. Analysis of the data suggests that the change from General Certificate of Education Ordinary Level (GCE O-level) to I/SGCSE was conditioned by inconsistencies between the cultural and structural mechanisms of the Swazi context. Many of the cultural elements of the Swazi context such as the discourses of good citizens, of competitive advantage, and of quality education draw from global discourses which view relations between people from a postmodernist position and therefore support weakly classified and framed pedagogic practices. In contrast, the discourse of morality and many of the structural elements of the Swazi context, such as the pre2006 education system and the Tinkhundla government system, all view reality from a modernist position, therefore supporting strong relations of power and control. The cultural system therefore exerted more influence in conditioning the change from the strongly classified and framed GCE O-level curriculum to the weakly classified and framed I/SGCSE curriculum. Furthermore, the analysis of interview and observation data suggests that inconsistencies between the global discourses and the discourses and structures that teachers confront in their day-to-day lives, together with the decisions teachers made in response to structural constraints, created constraining conditions for the change from GCE O-level to I/SGCSE. The study adds to knowledge on curriculum change and implementation through insights into the enabling and constraining effects of mechanisms operating at a deeper level of reality on curriculum-change decisions and on the ability of teachers to implement curriculum changes. The focus on the deeper level of reality may therefore contribute towards emancipatory knowledge which could be used not only by the Ministry of Education and Training and teachers in Swaziland but also elsewhere to inform future planning, decision making, and practice in relation to curriculum change and implementation.
- Full Text:
- Date Issued: 2012
Farm level institutions in emergent communities in post fast track Zimbabwe: case of Mazowe district
- Authors: Chiweshe, Manase Kudzai
- Date: 2012
- Subjects: Land reform -- Zimbabwe -- History -- 21st century Land settlement -- Social aspects -- Zimbabwe Zimbabwe -- Social conditions -- 1980- Zimbabwe -- Economic conditions Zimbabwe -- Politics and government -- 1980-
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3308 , http://hdl.handle.net/10962/d1003096
- Description: The thesis seeks to understand how emerging communities borne out of the Fast Track Land Reform Programme in Zimbabwe have been able to ensure social cohesion and social service provision using farm level institutions. The Fast Track Programme brought together people from diverse backgrounds into new communities in the former commercial farming areas. The formation of new communities meant that, often, there were 'stranger households'living next to each other. Since 2000, these people have been involved in various processes aimed at turning clusters of homesteads into functioning communities through farm level institutions. Fast track land reform precipitated economic and political crisis in Zimbabwe characterised by a rapidly devaluating Zimbabwean dollar, enormous inflation and high unemployment figures. This economic crisis has impacted heavily on new farmers who find it increasingly difficult to afford inputs and access loans. They have formed social networks in response to these challenges, taking the form of farm level institutions such as farm committees, irrigation committees and health committees. The study uses case studies from small-scale 'A1 farmers‘ in Mazowe district which is in Mashonaland Central Province. It employs qualitative methodologies to enable a nuanced understanding of associational life in the new communities. Through focus group discussions, in-depth interviews, narratives, key informant interviews and institutional mapping the study outlines the formation, taxonomy, activities, roles, internal dynamics and social organisation of farm level institutions. The study also uses secondary data collected in 2007-08 by the Centre for Rural Development in the newly resettled areas in Mazowe. The major finding of the study is that farmers are organising in novel ways at grassroots levels to meet everyday challenges. These institutional forms however are internally weak, lacking leadership with a clear vision and they appear as if they are transitory in nature. They remain marginalised from national and global processes and isolated from critical connections to policy makers at all levels; thus A1 farmers remain voiceless and unable to have their interests addressed. Farm level institutions are at the forefront of the microeconomics of survival among these rural farmers. They are survivalist in nature and form, and this requires a major shift in focus if they are to be involved in developmental work. The institutions remain fragmented and compete amongst themselves for services from government without uniting as A1 farmers with similar interests and challenges.
- Full Text:
- Date Issued: 2012
Farm level institutions in emergent communities in post fast track Zimbabwe: case of Mazowe district
- Authors: Chiweshe, Manase Kudzai
- Date: 2012
- Subjects: Land reform -- Zimbabwe -- History -- 21st century Land settlement -- Social aspects -- Zimbabwe Zimbabwe -- Social conditions -- 1980- Zimbabwe -- Economic conditions Zimbabwe -- Politics and government -- 1980-
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3308 , http://hdl.handle.net/10962/d1003096
- Description: The thesis seeks to understand how emerging communities borne out of the Fast Track Land Reform Programme in Zimbabwe have been able to ensure social cohesion and social service provision using farm level institutions. The Fast Track Programme brought together people from diverse backgrounds into new communities in the former commercial farming areas. The formation of new communities meant that, often, there were 'stranger households'living next to each other. Since 2000, these people have been involved in various processes aimed at turning clusters of homesteads into functioning communities through farm level institutions. Fast track land reform precipitated economic and political crisis in Zimbabwe characterised by a rapidly devaluating Zimbabwean dollar, enormous inflation and high unemployment figures. This economic crisis has impacted heavily on new farmers who find it increasingly difficult to afford inputs and access loans. They have formed social networks in response to these challenges, taking the form of farm level institutions such as farm committees, irrigation committees and health committees. The study uses case studies from small-scale 'A1 farmers‘ in Mazowe district which is in Mashonaland Central Province. It employs qualitative methodologies to enable a nuanced understanding of associational life in the new communities. Through focus group discussions, in-depth interviews, narratives, key informant interviews and institutional mapping the study outlines the formation, taxonomy, activities, roles, internal dynamics and social organisation of farm level institutions. The study also uses secondary data collected in 2007-08 by the Centre for Rural Development in the newly resettled areas in Mazowe. The major finding of the study is that farmers are organising in novel ways at grassroots levels to meet everyday challenges. These institutional forms however are internally weak, lacking leadership with a clear vision and they appear as if they are transitory in nature. They remain marginalised from national and global processes and isolated from critical connections to policy makers at all levels; thus A1 farmers remain voiceless and unable to have their interests addressed. Farm level institutions are at the forefront of the microeconomics of survival among these rural farmers. They are survivalist in nature and form, and this requires a major shift in focus if they are to be involved in developmental work. The institutions remain fragmented and compete amongst themselves for services from government without uniting as A1 farmers with similar interests and challenges.
- Full Text:
- Date Issued: 2012
The contribution of hip hop to the construction of personal indentities of South African female late adolescents
- Authors: Gitonga, Priscilla Nyawira
- Date: 2012
- Subjects: Hip-hop -- South Africa -- Influence , Women -- Identity , Teenage girls , Group identity
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/4288 , vital:20581
- Description: Identity construction is an integral task during late adolescence. In this study, I argue that hip hop music contributes to the process of identity construction among female late adolescents. The contexts that the female late adolescent is exposed to affect her process of identity construction. These contexts include family, friends, peers, religion, and popular culture, among other things. Hip hop music forms part of present-day popular culture. Adolescents have access to this genre of music via the mass media and social networks. The aim of this study is to explore the nature of hip hop‘s contribution to the identity construction of female late adolescents in South Africa. To this end, I engaged seven female late adolescents in several research activities, which enabled them to make sense of their perceived identities in the context of hip hop music. I then interpreted the participants‘ stories, in order to understand the process by which hip hop had contributed to their sense of personal identity. The participants in this study were first-year students in the Faculty of Education, Nelson Mandela Metropolitan University, who were all in the developmental phase of late adolescence. Narrative inquiry and participatory research (PR) approaches were the preferred strategies of data generation. The data-generation techniques included the use of drawings and lyric inquiry. These techniques served to stimulate the generation of narrative data. They also provided frameworks within which the participants could engage with their sense of identity in the context of hip hop music. The research revealed that hip hop music does indeed contribute to the process of personal identity construction of the female late adolescents who participated in the study. It does so by compelling the adolescent to think about herself in relation to her continual self, which draws from her past, present, and future, her interactional self, both at the personal and social levels, and her situational self. The appeal of hip hop to her cognitive capabilities is enhanced through the strong link that hip hop has with her emotions. The significance of this study can be summarised in three points. Firstly, this study provides empirical evidence of hip hop as a meaningful resource for the female adolescent as she constructs her identity. As such, the findings of this study negate the public notion of hip hop as being a bad influence on young people, and provides proof of its significant role in the lives of South African female adolescents. Secondly, this study is important for education in South Africa. The significance of hip hop music in education settings lies in its fundamental communicative capabilities, which can be effectively utilised in the classroom situation. Thirdly, this study strengthens educational research in South Africa, especially research aimed at the liberation and emancipation of female adolescents in South Africa. In this regard, this study provides alternative methodologies of inquiry to conventional research strategies, such as questionnaires and surveys.
- Full Text:
- Date Issued: 2012
- Authors: Gitonga, Priscilla Nyawira
- Date: 2012
- Subjects: Hip-hop -- South Africa -- Influence , Women -- Identity , Teenage girls , Group identity
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/4288 , vital:20581
- Description: Identity construction is an integral task during late adolescence. In this study, I argue that hip hop music contributes to the process of identity construction among female late adolescents. The contexts that the female late adolescent is exposed to affect her process of identity construction. These contexts include family, friends, peers, religion, and popular culture, among other things. Hip hop music forms part of present-day popular culture. Adolescents have access to this genre of music via the mass media and social networks. The aim of this study is to explore the nature of hip hop‘s contribution to the identity construction of female late adolescents in South Africa. To this end, I engaged seven female late adolescents in several research activities, which enabled them to make sense of their perceived identities in the context of hip hop music. I then interpreted the participants‘ stories, in order to understand the process by which hip hop had contributed to their sense of personal identity. The participants in this study were first-year students in the Faculty of Education, Nelson Mandela Metropolitan University, who were all in the developmental phase of late adolescence. Narrative inquiry and participatory research (PR) approaches were the preferred strategies of data generation. The data-generation techniques included the use of drawings and lyric inquiry. These techniques served to stimulate the generation of narrative data. They also provided frameworks within which the participants could engage with their sense of identity in the context of hip hop music. The research revealed that hip hop music does indeed contribute to the process of personal identity construction of the female late adolescents who participated in the study. It does so by compelling the adolescent to think about herself in relation to her continual self, which draws from her past, present, and future, her interactional self, both at the personal and social levels, and her situational self. The appeal of hip hop to her cognitive capabilities is enhanced through the strong link that hip hop has with her emotions. The significance of this study can be summarised in three points. Firstly, this study provides empirical evidence of hip hop as a meaningful resource for the female adolescent as she constructs her identity. As such, the findings of this study negate the public notion of hip hop as being a bad influence on young people, and provides proof of its significant role in the lives of South African female adolescents. Secondly, this study is important for education in South Africa. The significance of hip hop music in education settings lies in its fundamental communicative capabilities, which can be effectively utilised in the classroom situation. Thirdly, this study strengthens educational research in South Africa, especially research aimed at the liberation and emancipation of female adolescents in South Africa. In this regard, this study provides alternative methodologies of inquiry to conventional research strategies, such as questionnaires and surveys.
- Full Text:
- Date Issued: 2012
Assessing the impacts of invasive non-native African sharptooth catfish Clarias Gariepinus
- Authors: Kadye, Wilbert Takawira
- Date: 2012
- Subjects: Catfishes -- South Africa -- Eastern Cape Biological invasions -- South Africa -- Great Fish River Biological invasions -- South Africa -- Sundays River Clarias gariepinus Freshwater ecology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5227 , http://hdl.handle.net/10962/d1005070
- Description: Invasive species are of particular concern as they have the potential to alter community structure and food web relationships within their invaded habitats. African sharptooth catfish Clarias gariepinus, a generalist predator, was introduced through an inter-basin water transfer scheme into the Great Fish and Sundays Rivers, Eastern Cape, South Africa, where it threatens the native riverine biota. This thesis assessed its impact from a trophic perspective. Patterns in catfish distribution and abundance revealed an upstream to downstream gradient that was associated with spatial distribution of most species within the mainstream, and a mainstream to tributary gradient that was associated with the spatial distribution of native minnows. The catfish was predicted to occur widely within the mainstem habitats and to decrease progressively along the mainstrem to tributary gradient with the physico-chemical environment being a good proxy for predicting both its occurrence and abundance. The results suggest the catfish proliferated within mainstem habitats where invasion resistance was possibly reduced due to alteration of flow. Population dynamics and size structuring of two native cyprinid minnows Pseudobarbus afer and Barbus anoplus, threatened by catfish, were examined within uninvaded headwater streams in relation to their proximate physical habitats. Their habitats were characterised by seasonal variation in physico-chemical conditions and a spatial variation in substrata compositions. No evidence of differences was found between seasons for density and capture probability for either species. The population size and density for P. afer was found to increase with increasing proportion of boulders. In comparison, B. anoplus population size and probability of capture increased with increasing proportion of bedrock and bank vegetation, respectively. Size structuring was explained predominantly by seasonality and habitat variables for P. afer and B. anoplus, respectively. Stable isotope ratios of carbon and nitrogen were used to compare the spatial variation in both the community-wide and catfish-specific niches and to estimate catfish prey sources from different habitats within the invaded systems. Aquatic community and catfish niches were statistically different among localities, suggesting that each locality had a distinct community-wide trophic structure. Dispersion metrics indicated no evidence of differences in the clustering among individuals, but provided evidence of differences in path trajectories for the comparisons of catfish populations that suggested dietary plasticity within different localities. Dietary studies revealed both ontogenetic shift and omnivory that suggested that catfish may exhibit less pronounced top-down effects within its invaded habitats. Manipulative experiments were used to test the response of benthic macroinvertebrates within two rivers that were differentially impacted by catfish as a presstype disturbance. Macroinvertebrates were non-responsive to catfish presence within a system where catfish had previously been established. In contrast, excluding catfish in this system indicated a response that suggested the importance of refuge within invaded habitats and the possible recovery pattern of certain macroinvertebrate taxa. By comparison, introduction of catfish within previously uninvaded localities provided evidence of direct catfish impact through elimination of conspicuous taxa. Acoustic telemetry was used to investigate catfish movement patterns within an invaded lentic habitat and provided evidence that habitat utilisation was non-random. The shallow and structured river mouth habitat, which was most utilised, was probably the most ideal for its breeding and feeding. This inferred potential overlap with native species and suggested the risk of predation and competitive interference. Catfish also exhibited both nocturnal and diurnal activity patterns that were probably related to feeding.
- Full Text:
- Date Issued: 2012
- Authors: Kadye, Wilbert Takawira
- Date: 2012
- Subjects: Catfishes -- South Africa -- Eastern Cape Biological invasions -- South Africa -- Great Fish River Biological invasions -- South Africa -- Sundays River Clarias gariepinus Freshwater ecology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5227 , http://hdl.handle.net/10962/d1005070
- Description: Invasive species are of particular concern as they have the potential to alter community structure and food web relationships within their invaded habitats. African sharptooth catfish Clarias gariepinus, a generalist predator, was introduced through an inter-basin water transfer scheme into the Great Fish and Sundays Rivers, Eastern Cape, South Africa, where it threatens the native riverine biota. This thesis assessed its impact from a trophic perspective. Patterns in catfish distribution and abundance revealed an upstream to downstream gradient that was associated with spatial distribution of most species within the mainstream, and a mainstream to tributary gradient that was associated with the spatial distribution of native minnows. The catfish was predicted to occur widely within the mainstem habitats and to decrease progressively along the mainstrem to tributary gradient with the physico-chemical environment being a good proxy for predicting both its occurrence and abundance. The results suggest the catfish proliferated within mainstem habitats where invasion resistance was possibly reduced due to alteration of flow. Population dynamics and size structuring of two native cyprinid minnows Pseudobarbus afer and Barbus anoplus, threatened by catfish, were examined within uninvaded headwater streams in relation to their proximate physical habitats. Their habitats were characterised by seasonal variation in physico-chemical conditions and a spatial variation in substrata compositions. No evidence of differences was found between seasons for density and capture probability for either species. The population size and density for P. afer was found to increase with increasing proportion of boulders. In comparison, B. anoplus population size and probability of capture increased with increasing proportion of bedrock and bank vegetation, respectively. Size structuring was explained predominantly by seasonality and habitat variables for P. afer and B. anoplus, respectively. Stable isotope ratios of carbon and nitrogen were used to compare the spatial variation in both the community-wide and catfish-specific niches and to estimate catfish prey sources from different habitats within the invaded systems. Aquatic community and catfish niches were statistically different among localities, suggesting that each locality had a distinct community-wide trophic structure. Dispersion metrics indicated no evidence of differences in the clustering among individuals, but provided evidence of differences in path trajectories for the comparisons of catfish populations that suggested dietary plasticity within different localities. Dietary studies revealed both ontogenetic shift and omnivory that suggested that catfish may exhibit less pronounced top-down effects within its invaded habitats. Manipulative experiments were used to test the response of benthic macroinvertebrates within two rivers that were differentially impacted by catfish as a presstype disturbance. Macroinvertebrates were non-responsive to catfish presence within a system where catfish had previously been established. In contrast, excluding catfish in this system indicated a response that suggested the importance of refuge within invaded habitats and the possible recovery pattern of certain macroinvertebrate taxa. By comparison, introduction of catfish within previously uninvaded localities provided evidence of direct catfish impact through elimination of conspicuous taxa. Acoustic telemetry was used to investigate catfish movement patterns within an invaded lentic habitat and provided evidence that habitat utilisation was non-random. The shallow and structured river mouth habitat, which was most utilised, was probably the most ideal for its breeding and feeding. This inferred potential overlap with native species and suggested the risk of predation and competitive interference. Catfish also exhibited both nocturnal and diurnal activity patterns that were probably related to feeding.
- Full Text:
- Date Issued: 2012
Effect of cultivar on the quality of flax and hemp grown in South Africa
- Authors: Blouw, Langa Sunshine
- Date: 2012
- Subjects: Hemp -- South Africa , Flaxseed -- South Africa , Plant varieties , Textile industry
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9387 , http://hdl.handle.net/10948/d1010997 , Hemp -- South Africa , Flaxseed -- South Africa , Plant varieties , Textile industry
- Description: Bast fibrous renewable materials, as commercial crops for the manufacture of textile based and other products, have been used for thousands of years to satisfy certain human needs, such as for shelter, clothing, source of energy and tools, and to sustain the livelihood of many communities in countries, such as in Asia, Europe and Africa. Concern for the environment has led to a number of global initiatives that favour the use of natural fibres. It is forecast that the global fibre demand by 2050 will be 130 million tonnes, which the cotton and synthetic fibre production will not be able to meet. Other than the environmental concerns, the renewed global interest in natural fibres, such as flax and hemp, forms part of a strategy to satisfy the fibre demand. South Africa, notwithstanding the fact that the flax and hemp industries have long been established for thousands of years in Europe, Asia and Egypt (Africa), has no history of the breeding, growing, processing and production of these cash crops. The renewed global interest in these crops has also stimulated interest from South Africa with respect to the development of a flax and hemp fibre industry so as to address some of the socio-economic challenges confronting the country today in its attempts to bring about real development in the rural areas through the cultivation and complete beneficiation of these fibre crops. In this regard, the relevant stakeholders, namely government, research councils, tertiary education institutions, farmers and communities worked together to investigate whether South Africa has the agronomic and climatic conditions, technical expertise as well as the necessary processing and production infrastructure to support the development of a local flax and hemp agro-industry. The purpose of this study was firstly to evaluate the performance of EU flax and hemp cultivars grown under different agronomic conditions in South Africa, and their effect on straw biomass yield, fibre yield and total fibre yield per hectare as well as associated fibre properties, and secondly to undertake mechanical fibre modification trials aimed at producing flax and hemp fibres with fibre diameters close to those of cotton. The minimum fibre diameter targeted being 20μm. In accordance with the project objectives and work plan, selected dew retted flax and hemp straw samples from the various planting sites selected by the Agriculture Research Council – Institute for Industrial Crops, representing all the agronomic conditions under investigation, were taken to the CSIR for fibre extraction and testing. A relatively inexpensive and easy to operate Russian designed and manufactured machine, the CMT-200M breaker-cum-scutcher, was used for fibre extraction and the resultant extracted fibre bundles were further refined, using a steel comb, to obtain optimal fibre separation before their physical and chemical properties were evaluated. Results obtained in this research study proved that the climatic and agronomic conditions in South Africa were suitable for the cultivation of flax and hemp, notwithstanding the fact that the fibre yields achieved for hemp were lower than the minimum criteria of 23 percent, and that for flax only just exceeded the 25 percent minimum. The lack of local technical expertise on the growing and retting of flax and hemp, contributed to the low fibre yields. The planting parameters which were found to produce good results for the cultivation of hemp were the October planting date, using a row spacing of between 12.5 to 25 cm, with a seeding density of between 80 – 100kg, and the application of 50 – 100kg nitrogen fertiliser. The use of extra artificial lighting and herbicide treatment did not appear to beneficially improve the hemp fibre yields. Similar considerations for flax cultivation in the Southern Cape region, particularly Oudtshoorn and Outeniqua, indicated that May to July planting dates, using inter-row spacing of 25cm and sowing density of 63kg seed.haˉ¹, produced a fibre yield and total fibre yield per hectare above the minimum values of 25 percent and 0,8 tonnes per hectare, respectively, quoted in the literature.
- Full Text:
- Date Issued: 2012
- Authors: Blouw, Langa Sunshine
- Date: 2012
- Subjects: Hemp -- South Africa , Flaxseed -- South Africa , Plant varieties , Textile industry
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9387 , http://hdl.handle.net/10948/d1010997 , Hemp -- South Africa , Flaxseed -- South Africa , Plant varieties , Textile industry
- Description: Bast fibrous renewable materials, as commercial crops for the manufacture of textile based and other products, have been used for thousands of years to satisfy certain human needs, such as for shelter, clothing, source of energy and tools, and to sustain the livelihood of many communities in countries, such as in Asia, Europe and Africa. Concern for the environment has led to a number of global initiatives that favour the use of natural fibres. It is forecast that the global fibre demand by 2050 will be 130 million tonnes, which the cotton and synthetic fibre production will not be able to meet. Other than the environmental concerns, the renewed global interest in natural fibres, such as flax and hemp, forms part of a strategy to satisfy the fibre demand. South Africa, notwithstanding the fact that the flax and hemp industries have long been established for thousands of years in Europe, Asia and Egypt (Africa), has no history of the breeding, growing, processing and production of these cash crops. The renewed global interest in these crops has also stimulated interest from South Africa with respect to the development of a flax and hemp fibre industry so as to address some of the socio-economic challenges confronting the country today in its attempts to bring about real development in the rural areas through the cultivation and complete beneficiation of these fibre crops. In this regard, the relevant stakeholders, namely government, research councils, tertiary education institutions, farmers and communities worked together to investigate whether South Africa has the agronomic and climatic conditions, technical expertise as well as the necessary processing and production infrastructure to support the development of a local flax and hemp agro-industry. The purpose of this study was firstly to evaluate the performance of EU flax and hemp cultivars grown under different agronomic conditions in South Africa, and their effect on straw biomass yield, fibre yield and total fibre yield per hectare as well as associated fibre properties, and secondly to undertake mechanical fibre modification trials aimed at producing flax and hemp fibres with fibre diameters close to those of cotton. The minimum fibre diameter targeted being 20μm. In accordance with the project objectives and work plan, selected dew retted flax and hemp straw samples from the various planting sites selected by the Agriculture Research Council – Institute for Industrial Crops, representing all the agronomic conditions under investigation, were taken to the CSIR for fibre extraction and testing. A relatively inexpensive and easy to operate Russian designed and manufactured machine, the CMT-200M breaker-cum-scutcher, was used for fibre extraction and the resultant extracted fibre bundles were further refined, using a steel comb, to obtain optimal fibre separation before their physical and chemical properties were evaluated. Results obtained in this research study proved that the climatic and agronomic conditions in South Africa were suitable for the cultivation of flax and hemp, notwithstanding the fact that the fibre yields achieved for hemp were lower than the minimum criteria of 23 percent, and that for flax only just exceeded the 25 percent minimum. The lack of local technical expertise on the growing and retting of flax and hemp, contributed to the low fibre yields. The planting parameters which were found to produce good results for the cultivation of hemp were the October planting date, using a row spacing of between 12.5 to 25 cm, with a seeding density of between 80 – 100kg, and the application of 50 – 100kg nitrogen fertiliser. The use of extra artificial lighting and herbicide treatment did not appear to beneficially improve the hemp fibre yields. Similar considerations for flax cultivation in the Southern Cape region, particularly Oudtshoorn and Outeniqua, indicated that May to July planting dates, using inter-row spacing of 25cm and sowing density of 63kg seed.haˉ¹, produced a fibre yield and total fibre yield per hectare above the minimum values of 25 percent and 0,8 tonnes per hectare, respectively, quoted in the literature.
- Full Text:
- Date Issued: 2012
Teachers' perceptions of the state of readiness for the introduction of grade zero/early childhood education in Zimbabwe : a case study
- Authors: Mangwaya, Ezron Pemberai
- Date: 2012
- Subjects: Early childhood education -- Zimbabwe , Curriculum planning -- Zimbabwe , Readiness for school -- Zimbabwe , Education, Preschool -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9574 , http://hdl.handle.net/10948/d1018179
- Description: Up to 2005 early childhood education in Zimbabwe was organised, directed and run by non-governmental organisations, churches and private individuals. Such an arrangement meant that the curriculum, personnel and strategies used to implement the programme were varied. In 2004 the Ministry of Education directed that all primary schools attach two classes of children aged between 3 and 5 years with effect from 2006, thus effectively making early childhood education part of the formal primary school structure. The research presented in this thesis focuses on teachers' perceptions of primary schools' state of readiness for the introduction of early childhood education in Zimbabwe. Located in the interpretive paradigm of qualitative research the study draws on a wide range of research methods. In particular a multiple case study was used to explore teachers' perceptions of primary schools' state of readiness for the introduction of grade zero/early childhood education in a former government group B school, a church run school, a rural school, a former government group A school and, a council run school. Some of the key findings of the study are: • School heads who are the principal gate keepers in primary schools were not provided with any preparation for the introduction of grade zero/early childhood education. • School reliance on fees and levies, without direct Ministry of Education financial assistance, meant that resource conditions - hence state of readiness - greatly differed from one school to another. • No ongoing support was provided to school heads, teachers-in-charge and early childhood education teachers. • The quality of teaching and learning at the early childhood education level, in the multiple case study, depended on the nature of teacher preparation, availability of appropriate resources, adequacy and appropriateness of teacher support, and teacher state of preparedness. The study recommends interventions that curriculum policy planners and implementers can use to create conditions that enable schools to be ready for installing, implementing and institutionalising the early childhood education innovation.
- Full Text:
- Date Issued: 2012
- Authors: Mangwaya, Ezron Pemberai
- Date: 2012
- Subjects: Early childhood education -- Zimbabwe , Curriculum planning -- Zimbabwe , Readiness for school -- Zimbabwe , Education, Preschool -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9574 , http://hdl.handle.net/10948/d1018179
- Description: Up to 2005 early childhood education in Zimbabwe was organised, directed and run by non-governmental organisations, churches and private individuals. Such an arrangement meant that the curriculum, personnel and strategies used to implement the programme were varied. In 2004 the Ministry of Education directed that all primary schools attach two classes of children aged between 3 and 5 years with effect from 2006, thus effectively making early childhood education part of the formal primary school structure. The research presented in this thesis focuses on teachers' perceptions of primary schools' state of readiness for the introduction of early childhood education in Zimbabwe. Located in the interpretive paradigm of qualitative research the study draws on a wide range of research methods. In particular a multiple case study was used to explore teachers' perceptions of primary schools' state of readiness for the introduction of grade zero/early childhood education in a former government group B school, a church run school, a rural school, a former government group A school and, a council run school. Some of the key findings of the study are: • School heads who are the principal gate keepers in primary schools were not provided with any preparation for the introduction of grade zero/early childhood education. • School reliance on fees and levies, without direct Ministry of Education financial assistance, meant that resource conditions - hence state of readiness - greatly differed from one school to another. • No ongoing support was provided to school heads, teachers-in-charge and early childhood education teachers. • The quality of teaching and learning at the early childhood education level, in the multiple case study, depended on the nature of teacher preparation, availability of appropriate resources, adequacy and appropriateness of teacher support, and teacher state of preparedness. The study recommends interventions that curriculum policy planners and implementers can use to create conditions that enable schools to be ready for installing, implementing and institutionalising the early childhood education innovation.
- Full Text:
- Date Issued: 2012
A performance management model for universities in Uganda
- Authors: Karuhanga, Bernadette Nambi
- Date: 2012
- Subjects: Performance -- Management , Performance standards -- Uganda , Universities and colleges -- Uganda
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: http://hdl.handle.net/10948/6717 , vital:21138
- Description: As far as could be established, no empirical study had been conducted with the aim of designing a performance management model for systematically managing institutional performance at public universities in Uganda. The purpose of this study therefore, was to develop an institutional performance management model for universities in Uganda. This was achieved by establishing: the extent to which public universities in Uganda implemented institutional performance management, the challenges impacting institutional performance management implementation in universities in Uganda, how public universities could ensure effective institutional performance management implementation, the various measures of institutional performance that are applicable to universities in Uganda and the key components of the institutional performance management model that could be adopted by universities in Uganda in managing institutional performance. A mixed methods approach was adopted, applying both the qualitative and quantitative methodologies. Phenomenology and cross sectional survey strategies were adopted. Interviews were conducted with purposively selected top administrators of a selected public university and the results informed the survey questionnaire. This instrument was later administered to academic staff in four public universities using a disproportionate stratified random sampling technique. The findings revealed that strategic planning in public universities in Uganda does exist and it is aimed at achieving quality. Despite the existence of strategic planning, academic staff are uncertain about a number of issues related to strategic planning. Respondents generally disagreed that: performance management training is continuously provided to managers and staff, they have an effective performance management system and a formal process exists for units to provide feedback on the attainment of goals. Among the challenges impacting performance management implementation in universities in Uganda was: (i) Lack of a formal performance management environment; (ii) Limited employee engagement/communication problems; (iii) Institutional systems and structural challenges; (iv) Institutional governance challenges. The identified factors for the successful implementation of institutional performance management were categorised into four groups namely: (i) A performance framework, performance culture and employee support; (ii) An individual performance management system; (iii) Alignment; (iv) SMART goal setting. The study established that performance measures for public universities in Uganda could be categorised into five categories namely: (i) Leadership practices, infrastructure and academic profile; (ii) Accountability; (iii) Involvement with external stakeholders; (iv) Information and knowledge transfer; (v) Strategic implementation. Finally, the proposed performance management model consisted of three phases namely: (i) Designing the strategy; (ii) Implementation of the strategy; (iii) Evaluating rewarding and improving performance. University managers should pay close attention to the identified challenges while ensuring that the factors that facilitate successful performance management implementation are in place. The measures identified by this study could be used by policy makers and universities to determine the extent of performance of the various universities, not only in Uganda but also in sub-Saharan Africa and the proposed model could be adopted by universities in Uganda as well as by all institutions of higher learning during institutional performance management implementation. Ultimately, the success of the implementation process is vested fully in the commitment and willingness of management and the employees to participate in the entire process right from the design stage to the evaluation stage.
- Full Text:
- Date Issued: 2012
- Authors: Karuhanga, Bernadette Nambi
- Date: 2012
- Subjects: Performance -- Management , Performance standards -- Uganda , Universities and colleges -- Uganda
- Language: English
- Type: Thesis , Doctoral , DBA
- Identifier: http://hdl.handle.net/10948/6717 , vital:21138
- Description: As far as could be established, no empirical study had been conducted with the aim of designing a performance management model for systematically managing institutional performance at public universities in Uganda. The purpose of this study therefore, was to develop an institutional performance management model for universities in Uganda. This was achieved by establishing: the extent to which public universities in Uganda implemented institutional performance management, the challenges impacting institutional performance management implementation in universities in Uganda, how public universities could ensure effective institutional performance management implementation, the various measures of institutional performance that are applicable to universities in Uganda and the key components of the institutional performance management model that could be adopted by universities in Uganda in managing institutional performance. A mixed methods approach was adopted, applying both the qualitative and quantitative methodologies. Phenomenology and cross sectional survey strategies were adopted. Interviews were conducted with purposively selected top administrators of a selected public university and the results informed the survey questionnaire. This instrument was later administered to academic staff in four public universities using a disproportionate stratified random sampling technique. The findings revealed that strategic planning in public universities in Uganda does exist and it is aimed at achieving quality. Despite the existence of strategic planning, academic staff are uncertain about a number of issues related to strategic planning. Respondents generally disagreed that: performance management training is continuously provided to managers and staff, they have an effective performance management system and a formal process exists for units to provide feedback on the attainment of goals. Among the challenges impacting performance management implementation in universities in Uganda was: (i) Lack of a formal performance management environment; (ii) Limited employee engagement/communication problems; (iii) Institutional systems and structural challenges; (iv) Institutional governance challenges. The identified factors for the successful implementation of institutional performance management were categorised into four groups namely: (i) A performance framework, performance culture and employee support; (ii) An individual performance management system; (iii) Alignment; (iv) SMART goal setting. The study established that performance measures for public universities in Uganda could be categorised into five categories namely: (i) Leadership practices, infrastructure and academic profile; (ii) Accountability; (iii) Involvement with external stakeholders; (iv) Information and knowledge transfer; (v) Strategic implementation. Finally, the proposed performance management model consisted of three phases namely: (i) Designing the strategy; (ii) Implementation of the strategy; (iii) Evaluating rewarding and improving performance. University managers should pay close attention to the identified challenges while ensuring that the factors that facilitate successful performance management implementation are in place. The measures identified by this study could be used by policy makers and universities to determine the extent of performance of the various universities, not only in Uganda but also in sub-Saharan Africa and the proposed model could be adopted by universities in Uganda as well as by all institutions of higher learning during institutional performance management implementation. Ultimately, the success of the implementation process is vested fully in the commitment and willingness of management and the employees to participate in the entire process right from the design stage to the evaluation stage.
- Full Text:
- Date Issued: 2012