Evaluating uncertainty in water resources estimation in Southern Africa : a case study of South Africa
- Authors: Sawunyama, Tendai
- Date: 2009
- Subjects: Water supply -- South Africa , Water supply -- Africa, Southern , Hydrology -- South Africa , Hydrology -- Africa, Southern , Hydrologic models , Hydrology research -- South Africa , Hydrology research -- Africa, Southern , Rain and rainfall -- Mathematical models , Runoff -- Mathematical models
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6035 , http://hdl.handle.net/10962/d1006176
- Description: Hydrological models are widely used tools in water resources estimation, but they are simple representations of reality and are frequently based on inadequate input data and uncertainties in parameter values. Data observation networks are expensive to establish and maintain and often beyond the resources of most developing countries. Consequently, measurements are difficult to obtain and observation networks in many countries are shrinking, hence obtaining representative observations in space and time remains a challenge. This study presents some guidelines on the identification, quantification and reduction of sources of uncertainty in water resources estimation in southern Africa, a data scarce region. The analyses are based on example sub-basins drawn from South Africa and the application of the Pitman hydrological model. While it has always been recognised that estimates of water resources availability for the region are subject to possible errors, the quantification of these uncertainties has never been explicitly incorporated into the methods used in the region. The motivation for this study was therefore to contribute to the future development of a revised framework for water resources estimation that does include uncertainty. The focus was on uncertainties associated with climate input data, parameter estimation (and recognizing the uncertainty due model structure deficiencies) methods and water use data. In addition to variance based measures of uncertainty, this study also used a reservoir yield based statistic to evaluate model output uncertainty, which represents an integrated measure of flow regime variations and one that can be more easily understood by water resources managers. Through a sensitivity analysis approach, the results of the individual contribution of each source of uncertainty suggest regional differences and that clear statements about which source of uncertainty is likely to dominate are not generally possible. Parameter sensitivity analysis was used in identifying parameters which are important withinspecific sub-basins and therefore those to focus on in uncertainty analysis. The study used a simple framework for evaluating the combined contribution of uncertainty sources to model outputs that is consistent with the model limitations and data available, and that allows direct quantitative comparison between model outputs obtained by using different sources of information and methods within Spatial and Time Series Information Modelling (SPATSIM) software. The results from combining the sources of uncertainties showed that parameter uncertainty dominates the contribution to model output uncertainty. However, in some parts of the country especially those with complex topography, which tend to experience high rainfall spatial variability, rainfall uncertainty is equally dominant, while the contributions of evaporation and water use data uncertainty are relatively small. While the results of this study are encouraging, the weaknesses of the methods used to quantify uncertainty (especially subjectivity involved in evaluating parameter uncertainty) should not be neglected and require further evaluations. An effort to reduce data and parameter uncertainty shows that this can only be achieved if data access at appropriate scale and quality improves. Perhaps the focus should be on maintaining existing networks and concentrating research efforts on making the most out of the emerging data products derived from remote sensing platforms. While this study presents some initial guidelines for evaluating uncertainty in South Africa, there is need to overcome several constraints which are related to data availability and accuracy, the models used and the capacity or willingness to adopt new methods that incorporate uncertainty. The study has provided a starting point for the development of new approaches to modelling water resources in the region that include uncertain estimates.
- Full Text:
- Date Issued: 2009
- Authors: Sawunyama, Tendai
- Date: 2009
- Subjects: Water supply -- South Africa , Water supply -- Africa, Southern , Hydrology -- South Africa , Hydrology -- Africa, Southern , Hydrologic models , Hydrology research -- South Africa , Hydrology research -- Africa, Southern , Rain and rainfall -- Mathematical models , Runoff -- Mathematical models
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6035 , http://hdl.handle.net/10962/d1006176
- Description: Hydrological models are widely used tools in water resources estimation, but they are simple representations of reality and are frequently based on inadequate input data and uncertainties in parameter values. Data observation networks are expensive to establish and maintain and often beyond the resources of most developing countries. Consequently, measurements are difficult to obtain and observation networks in many countries are shrinking, hence obtaining representative observations in space and time remains a challenge. This study presents some guidelines on the identification, quantification and reduction of sources of uncertainty in water resources estimation in southern Africa, a data scarce region. The analyses are based on example sub-basins drawn from South Africa and the application of the Pitman hydrological model. While it has always been recognised that estimates of water resources availability for the region are subject to possible errors, the quantification of these uncertainties has never been explicitly incorporated into the methods used in the region. The motivation for this study was therefore to contribute to the future development of a revised framework for water resources estimation that does include uncertainty. The focus was on uncertainties associated with climate input data, parameter estimation (and recognizing the uncertainty due model structure deficiencies) methods and water use data. In addition to variance based measures of uncertainty, this study also used a reservoir yield based statistic to evaluate model output uncertainty, which represents an integrated measure of flow regime variations and one that can be more easily understood by water resources managers. Through a sensitivity analysis approach, the results of the individual contribution of each source of uncertainty suggest regional differences and that clear statements about which source of uncertainty is likely to dominate are not generally possible. Parameter sensitivity analysis was used in identifying parameters which are important withinspecific sub-basins and therefore those to focus on in uncertainty analysis. The study used a simple framework for evaluating the combined contribution of uncertainty sources to model outputs that is consistent with the model limitations and data available, and that allows direct quantitative comparison between model outputs obtained by using different sources of information and methods within Spatial and Time Series Information Modelling (SPATSIM) software. The results from combining the sources of uncertainties showed that parameter uncertainty dominates the contribution to model output uncertainty. However, in some parts of the country especially those with complex topography, which tend to experience high rainfall spatial variability, rainfall uncertainty is equally dominant, while the contributions of evaporation and water use data uncertainty are relatively small. While the results of this study are encouraging, the weaknesses of the methods used to quantify uncertainty (especially subjectivity involved in evaluating parameter uncertainty) should not be neglected and require further evaluations. An effort to reduce data and parameter uncertainty shows that this can only be achieved if data access at appropriate scale and quality improves. Perhaps the focus should be on maintaining existing networks and concentrating research efforts on making the most out of the emerging data products derived from remote sensing platforms. While this study presents some initial guidelines for evaluating uncertainty in South Africa, there is need to overcome several constraints which are related to data availability and accuracy, the models used and the capacity or willingness to adopt new methods that incorporate uncertainty. The study has provided a starting point for the development of new approaches to modelling water resources in the region that include uncertain estimates.
- Full Text:
- Date Issued: 2009
Evaluation of a plant-herbivore system in determining potential efficacy of a candidate biological control agent, cornops aquaticum for water hyacinth, eichhornia crassipes
- Authors: Bownes, Angela
- Date: 2009
- Subjects: Water hyacinth -- Control -- South Africa , Eichhornia crassipedes , Pontederiaceae , Grasshoppers , Biological pest control agents -- South Africa , Weeds -- Biological control -- South Africa , Invasive plants -- Biological control -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5687 , http://hdl.handle.net/10962/d1005373
- Description: Water hyacinth, Eichhornia crassipes Mart. Solms-Laubach (Pontederiaceae), a freefloating aquatic macrophyte of Neotropical origin, was introduced into South Africa as an ornamental aquarium plant in the early 1900’s. By the 1970’s it had reached pest proportions in dams and rivers around the country. Due to the sustainability, cost efficiency and low environmental risk associated with biological control, this has been a widely used method in an attempt to reduce infestations to below the threshold where they cause economic and ecological damage. To date, five arthropod and one pathogen biocontrol agents have been introduced for the control of water hyacinth but their impact has been variable. It is believed that their efficacy is hampered by the presence of highly eutrophic systems in South Africa in which plant growth is prolific and the negative effects of herbivory are therefore mitigated. It is for these reasons that new, potentially more damaging biocontrol agents are being considered for release. The water hyacinth grasshopper, Cornops aquaticum Brüner (Orthoptera: Acrididae), which is native to South America and Mexico, was brought into quarantine in Pretoria, South Africa in 1995. Although the grasshopper was identified as one of the most damaging insects associated with water hyacinth in its native range, it has not been considered as a biocontrol agent for water hyacinth anywhere else in the world. After extensive host-range testing which revealed it to be safe for release, a release permit for this candidate agent was issued in 2007. However, host specificity testing is no longer considered to be the only important component of pre-release screening of candidate biocontrol agents. Investigating biological and ecological aspects of the plant-herbivore system that will assist in determination of potential establishment, efficacy and the ability to build up good populations in the recipient environment are some of the important factors. This thesis is a pre-release evaluation of C. aquaticum to determine whether it is sufficiently damaging to water hyacinth to warrant its release. It investigated interactions between the grasshopper and water hyacinth under a range of nutrient conditions found in South African water bodies as well as the impact of the grasshopper on the competitive performance of water hyacinth. Both plant growth rates and the response of water hyacinth to herbivory by the grasshopper were influenced by nutrient availability to the plants. The ability of water hyacinth to compensate for loss of tissue through herbivory was greater under eutrophic nutrient conditions. However, a negative linear relationship was found between grasshopper biomass and water hyacinth performance parameters such as biomass accumulation and leaf production, even under eutrophic conditions. Water hyacinth’s compensatory ability in terms of its potential to mitigate to detrimental effects of insect feeding was dependent on the amount of damage caused by herbivory by the grasshopper. Plant biomass and the competitive ability of water hyacinth in relation to another freefloating aquatic weed species were reduced by C. aquaticum under eutrophic nutrient conditions, in a short space of time. It was also found that grasshopper feeding and characteristics related to their population dynamics such as fecundity and survival were significantly influenced by water nutrient availability and that environmental nutrient availability will influence the control potential of this species should it be released in South Africa. Cornops aquaticum shows promise as a biocontrol agent for water hyacinth but additional factors that were not investigated in this study such as compatibility with the South African climate and the current water hyacinth biocontrol agents need to be combined with these data to make a decision on its release. Possible management options for this species if it is to be introduced into South Africa are discussed.
- Full Text:
- Date Issued: 2009
- Authors: Bownes, Angela
- Date: 2009
- Subjects: Water hyacinth -- Control -- South Africa , Eichhornia crassipedes , Pontederiaceae , Grasshoppers , Biological pest control agents -- South Africa , Weeds -- Biological control -- South Africa , Invasive plants -- Biological control -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5687 , http://hdl.handle.net/10962/d1005373
- Description: Water hyacinth, Eichhornia crassipes Mart. Solms-Laubach (Pontederiaceae), a freefloating aquatic macrophyte of Neotropical origin, was introduced into South Africa as an ornamental aquarium plant in the early 1900’s. By the 1970’s it had reached pest proportions in dams and rivers around the country. Due to the sustainability, cost efficiency and low environmental risk associated with biological control, this has been a widely used method in an attempt to reduce infestations to below the threshold where they cause economic and ecological damage. To date, five arthropod and one pathogen biocontrol agents have been introduced for the control of water hyacinth but their impact has been variable. It is believed that their efficacy is hampered by the presence of highly eutrophic systems in South Africa in which plant growth is prolific and the negative effects of herbivory are therefore mitigated. It is for these reasons that new, potentially more damaging biocontrol agents are being considered for release. The water hyacinth grasshopper, Cornops aquaticum Brüner (Orthoptera: Acrididae), which is native to South America and Mexico, was brought into quarantine in Pretoria, South Africa in 1995. Although the grasshopper was identified as one of the most damaging insects associated with water hyacinth in its native range, it has not been considered as a biocontrol agent for water hyacinth anywhere else in the world. After extensive host-range testing which revealed it to be safe for release, a release permit for this candidate agent was issued in 2007. However, host specificity testing is no longer considered to be the only important component of pre-release screening of candidate biocontrol agents. Investigating biological and ecological aspects of the plant-herbivore system that will assist in determination of potential establishment, efficacy and the ability to build up good populations in the recipient environment are some of the important factors. This thesis is a pre-release evaluation of C. aquaticum to determine whether it is sufficiently damaging to water hyacinth to warrant its release. It investigated interactions between the grasshopper and water hyacinth under a range of nutrient conditions found in South African water bodies as well as the impact of the grasshopper on the competitive performance of water hyacinth. Both plant growth rates and the response of water hyacinth to herbivory by the grasshopper were influenced by nutrient availability to the plants. The ability of water hyacinth to compensate for loss of tissue through herbivory was greater under eutrophic nutrient conditions. However, a negative linear relationship was found between grasshopper biomass and water hyacinth performance parameters such as biomass accumulation and leaf production, even under eutrophic conditions. Water hyacinth’s compensatory ability in terms of its potential to mitigate to detrimental effects of insect feeding was dependent on the amount of damage caused by herbivory by the grasshopper. Plant biomass and the competitive ability of water hyacinth in relation to another freefloating aquatic weed species were reduced by C. aquaticum under eutrophic nutrient conditions, in a short space of time. It was also found that grasshopper feeding and characteristics related to their population dynamics such as fecundity and survival were significantly influenced by water nutrient availability and that environmental nutrient availability will influence the control potential of this species should it be released in South Africa. Cornops aquaticum shows promise as a biocontrol agent for water hyacinth but additional factors that were not investigated in this study such as compatibility with the South African climate and the current water hyacinth biocontrol agents need to be combined with these data to make a decision on its release. Possible management options for this species if it is to be introduced into South Africa are discussed.
- Full Text:
- Date Issued: 2009
Evaluation of an implemented quality management system (QMS) at one of the South African government departments: employee perceptions of the effect of the QMS intervention
- Authors: Maluleke, Yinywane Leon
- Date: 2009
- Subjects: Total quality management in government Public administration -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:739 , http://hdl.handle.net/10962/d1003859
- Description: This study is about the employee perceptions of the effect of the Quality Management System intervention that was implemented at one of South Africa’s government departments. This organisation’s Quality Management System being one of the first in the government or public sector in South Africa to be implemented, creates the possibility for this Quality Management System model to be used to develop Quality Management Systems in other departments or organisations belonging to the government or the public sector in South Africa and the Southern African region. According to Madu & Kuei (1995), Quality Management System describes a situation where all business functions are involved in a process of continuous quality improvement. This implies that the development and implementation of Quality Management Systems in government departments and the public sector will improve the quality of services delivery. The findings of this study indicated that a Quality Management System can be used to improve the level of service delivery in the public sector. The Quality Management System should be planned developed and implemented over a period of time in five phases (i) Phase 1 - Determination of the scope of Quality Management System implementation (ii) Phase 2 – Training (iii) Phase 3 – Development of Procedures (iv) Phase 4 – Pilot implementation of procedures (v) Phase 5 – Evaluation of Quality Management System and rollout. It usually takes three or more years to establish an organisation-wide Quality Management System, although technical improvement to the workflow can be as quickly as six to eight months. And finally, for the Quality Management System to be developed, implemented and maintained successfully, Maximisation of Performance objectives, Good Leadership, Motivation of staff, Implementation of Change Management, Employee Involvement, Long-term Top Management Commitment, Provision of Training, Introduction of Quality Improvement Projects, Measuring Quality Management System Progress and Reward Accomplishment, are the fundamental concepts or principles that should be considered.
- Full Text:
- Date Issued: 2009
- Authors: Maluleke, Yinywane Leon
- Date: 2009
- Subjects: Total quality management in government Public administration -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:739 , http://hdl.handle.net/10962/d1003859
- Description: This study is about the employee perceptions of the effect of the Quality Management System intervention that was implemented at one of South Africa’s government departments. This organisation’s Quality Management System being one of the first in the government or public sector in South Africa to be implemented, creates the possibility for this Quality Management System model to be used to develop Quality Management Systems in other departments or organisations belonging to the government or the public sector in South Africa and the Southern African region. According to Madu & Kuei (1995), Quality Management System describes a situation where all business functions are involved in a process of continuous quality improvement. This implies that the development and implementation of Quality Management Systems in government departments and the public sector will improve the quality of services delivery. The findings of this study indicated that a Quality Management System can be used to improve the level of service delivery in the public sector. The Quality Management System should be planned developed and implemented over a period of time in five phases (i) Phase 1 - Determination of the scope of Quality Management System implementation (ii) Phase 2 – Training (iii) Phase 3 – Development of Procedures (iv) Phase 4 – Pilot implementation of procedures (v) Phase 5 – Evaluation of Quality Management System and rollout. It usually takes three or more years to establish an organisation-wide Quality Management System, although technical improvement to the workflow can be as quickly as six to eight months. And finally, for the Quality Management System to be developed, implemented and maintained successfully, Maximisation of Performance objectives, Good Leadership, Motivation of staff, Implementation of Change Management, Employee Involvement, Long-term Top Management Commitment, Provision of Training, Introduction of Quality Improvement Projects, Measuring Quality Management System Progress and Reward Accomplishment, are the fundamental concepts or principles that should be considered.
- Full Text:
- Date Issued: 2009
Evaluation of the effect of Pelargonium reniforme Curtis extract on alcohol induced liver damage in Nkonkobe Municipality Eastern Cape Province South Africa
- Authors: Adewusi, Emmanuel Adekanmi
- Date: 2009
- Subjects: Plants -- Therapeutic use , Alcoholism -- South Africa -- Eastern Cape , Hepatolenticular degeneration , Pelargoniums , Plant extracts , Plant bioassay , Medicinal plants -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Ethnobotany)
- Identifier: vital:11883 , http://hdl.handle.net/10353/263 , Plants -- Therapeutic use , Alcoholism -- South Africa -- Eastern Cape , Hepatolenticular degeneration , Pelargoniums , Plant extracts , Plant bioassay , Medicinal plants -- South Africa -- Eastern Cape
- Description: Alcohol abuse is a very common practice (just like in many other parts of the world) in Nkonkobe Municipality, Eastern Cape Province, South Africa. This is associated with liver disease. An ethnobotanical survey of plants used for the treatment of alcohol-induced liver damage in Nkonkobe Municipality was conducted. During the survey and also from information gathered in the literature, Pelargonium reniforme Curtis, was prominently mentioned, among other plants, as the species used generally for the treatment of alcohol-induced liver damage. This project was designed to evaluate the effects of the plant on alcohol-induced liver damage, including its antioxidant and antimicrobial properties. It also involves safety evaluation studies to determine if the plant is safe for consumption. Studies using rats of the Wistar strain were carried out to determine the protective and curative effects of P. reniforme on alcohol-induced liver damage. Results obtained showed that the plant extract can protect the liver cells as well as enhance recovery from tissue damage. The plant also showed good antimicrobial and antioxidant activity and this further validates its use in the treatment of liver diseases. Safety evaluation studies of the extract were carried out by investigating the effects of the oral administration on some haematological and biochemical parameters in male Wistar rats. The results obtained from the study suggest that the plant extract is not toxic at the doses used and is therefore safe for medicinal uses. The results of the various bioassays carried out in this project have justified the traditional uses of P. reniforme for the treatment of alcohol-induced liver damage.
- Full Text:
- Date Issued: 2009
- Authors: Adewusi, Emmanuel Adekanmi
- Date: 2009
- Subjects: Plants -- Therapeutic use , Alcoholism -- South Africa -- Eastern Cape , Hepatolenticular degeneration , Pelargoniums , Plant extracts , Plant bioassay , Medicinal plants -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Ethnobotany)
- Identifier: vital:11883 , http://hdl.handle.net/10353/263 , Plants -- Therapeutic use , Alcoholism -- South Africa -- Eastern Cape , Hepatolenticular degeneration , Pelargoniums , Plant extracts , Plant bioassay , Medicinal plants -- South Africa -- Eastern Cape
- Description: Alcohol abuse is a very common practice (just like in many other parts of the world) in Nkonkobe Municipality, Eastern Cape Province, South Africa. This is associated with liver disease. An ethnobotanical survey of plants used for the treatment of alcohol-induced liver damage in Nkonkobe Municipality was conducted. During the survey and also from information gathered in the literature, Pelargonium reniforme Curtis, was prominently mentioned, among other plants, as the species used generally for the treatment of alcohol-induced liver damage. This project was designed to evaluate the effects of the plant on alcohol-induced liver damage, including its antioxidant and antimicrobial properties. It also involves safety evaluation studies to determine if the plant is safe for consumption. Studies using rats of the Wistar strain were carried out to determine the protective and curative effects of P. reniforme on alcohol-induced liver damage. Results obtained showed that the plant extract can protect the liver cells as well as enhance recovery from tissue damage. The plant also showed good antimicrobial and antioxidant activity and this further validates its use in the treatment of liver diseases. Safety evaluation studies of the extract were carried out by investigating the effects of the oral administration on some haematological and biochemical parameters in male Wistar rats. The results obtained from the study suggest that the plant extract is not toxic at the doses used and is therefore safe for medicinal uses. The results of the various bioassays carried out in this project have justified the traditional uses of P. reniforme for the treatment of alcohol-induced liver damage.
- Full Text:
- Date Issued: 2009
Evolutionary development and functional role of plant natriuretic peptide (PNP)-B
- Authors: Hove, Runyararo Memory
- Date: 2009
- Subjects: Plant hormones , Peptides , Plant gene expression , Peptide hormones , Peptides -- Separation
- Language: English
- Type: Thesis , Masters , MSc (Biochemistry)
- Identifier: vital:11251 , http://hdl.handle.net/10353/155 , Plant hormones , Peptides , Plant gene expression , Peptide hormones , Peptides -- Separation
- Description: Plant natriuretic peptides (PNP) are novel peptides which, like in vertebrates, have been shown to have a function associated with water and salt homeostasis. Two PNP-encoding genes have been identified and isolated from Arabidopsis thaliana, namely; AtPNP-A and AtPNP-B. In this study, the focus was on PNP-B, which has not been extensively studied. Bioinformatic analysis was done on the AtPNP-B gene. This included the bioinformatic study of its primary structure, secondary structure, tertiary structure, transcription factor binding sites (TFBS) and its relation to other known proteins. The AtPNP-B gene was shown to be a 510 bp long, including a predicted 138 bp intron. AtPNP-B was also shown to have some sequence similarity with AtPNP-A and CjBAp12. The TFBS for AtPNP-B and OsJPNP-B were compared and they comprised of TFBS that are related to water homeostasis and pathogenesis. This suggested two possible functions; water stress and homeostasis and a pathogenesis related function for PNP-B. Following bioinformatic analysis, the heterologous expression of the AtPNP-B was attempted to investigate whether the AtPNP-B gene encoded a functional protein and to determine the functional role of PNP-B. However, expression was unsuccessful. An evolutionary study was then carried out which revealed that there were some plants without the intron such as, rice, leafy spurge, oilseed rape, onion, poplar, sugar cane, sunflower and tobacco. These plants would therefore be used for expression and functional studies in the future. The evolutionary studies also revealed that PNP-B had a relationship with expansins and the endoglucanase family 45. Other PNP-B related molecules were also obtained from other plant genomes and therefore used in the construction of a phylogenetic tree. The phylogenetic tree revealed that AtPNP-B clustered in the same group as CjBAp12 while AtPNP-A had its own cluster group. There were also other PNP-B like molecules that clustered in the same group as expansins (α- and β-). Thus, we postulate that, like PNP-A, PNP-B also has a possible function in water and salt homeostasis. However, due to the clustering iii of AtPNP-B into the same group as CjBAp12, a possible role of PNP-B in pathogenesis-related response is also postulated.
- Full Text:
- Date Issued: 2009
- Authors: Hove, Runyararo Memory
- Date: 2009
- Subjects: Plant hormones , Peptides , Plant gene expression , Peptide hormones , Peptides -- Separation
- Language: English
- Type: Thesis , Masters , MSc (Biochemistry)
- Identifier: vital:11251 , http://hdl.handle.net/10353/155 , Plant hormones , Peptides , Plant gene expression , Peptide hormones , Peptides -- Separation
- Description: Plant natriuretic peptides (PNP) are novel peptides which, like in vertebrates, have been shown to have a function associated with water and salt homeostasis. Two PNP-encoding genes have been identified and isolated from Arabidopsis thaliana, namely; AtPNP-A and AtPNP-B. In this study, the focus was on PNP-B, which has not been extensively studied. Bioinformatic analysis was done on the AtPNP-B gene. This included the bioinformatic study of its primary structure, secondary structure, tertiary structure, transcription factor binding sites (TFBS) and its relation to other known proteins. The AtPNP-B gene was shown to be a 510 bp long, including a predicted 138 bp intron. AtPNP-B was also shown to have some sequence similarity with AtPNP-A and CjBAp12. The TFBS for AtPNP-B and OsJPNP-B were compared and they comprised of TFBS that are related to water homeostasis and pathogenesis. This suggested two possible functions; water stress and homeostasis and a pathogenesis related function for PNP-B. Following bioinformatic analysis, the heterologous expression of the AtPNP-B was attempted to investigate whether the AtPNP-B gene encoded a functional protein and to determine the functional role of PNP-B. However, expression was unsuccessful. An evolutionary study was then carried out which revealed that there were some plants without the intron such as, rice, leafy spurge, oilseed rape, onion, poplar, sugar cane, sunflower and tobacco. These plants would therefore be used for expression and functional studies in the future. The evolutionary studies also revealed that PNP-B had a relationship with expansins and the endoglucanase family 45. Other PNP-B related molecules were also obtained from other plant genomes and therefore used in the construction of a phylogenetic tree. The phylogenetic tree revealed that AtPNP-B clustered in the same group as CjBAp12 while AtPNP-A had its own cluster group. There were also other PNP-B like molecules that clustered in the same group as expansins (α- and β-). Thus, we postulate that, like PNP-A, PNP-B also has a possible function in water and salt homeostasis. However, due to the clustering iii of AtPNP-B into the same group as CjBAp12, a possible role of PNP-B in pathogenesis-related response is also postulated.
- Full Text:
- Date Issued: 2009
Exchange rate pass‐through to import prices in South Africa: is there asymmetry?
- Karoro, Tapiwa D, Aziakpono, Meshach J, Cattaneo, Nicolette S
- Authors: Karoro, Tapiwa D , Aziakpono, Meshach J , Cattaneo, Nicolette S
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/469753 , vital:77291 , https://doi.org/10.1111/j.1813-6982.2009.01216.x
- Description: This paper examines the magnitude and speed of exchange rate pass‐through (ERPT) to import prices in South Africa. It further explores whether the direction and size of changes in the exchange rate have different pass‐through effects on import prices, i.e. whether the exchange rate pass‐through is symmetric or asymmetric. The findings of the study suggest that ERPT in South Africa is incomplete but relatively high. Furthermore, ERPT is found to be higher in periods of rand depreciation than appreciation, which supports the binding quantity constraint theory. There is also evidence to suggest that pass‐through is slightly higher in periods of small changes than large changes in the exchange rate in harmony with the menu cost theory when the invoices are denominated in the exporters' currency.
- Full Text:
- Date Issued: 2009
- Authors: Karoro, Tapiwa D , Aziakpono, Meshach J , Cattaneo, Nicolette S
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/469753 , vital:77291 , https://doi.org/10.1111/j.1813-6982.2009.01216.x
- Description: This paper examines the magnitude and speed of exchange rate pass‐through (ERPT) to import prices in South Africa. It further explores whether the direction and size of changes in the exchange rate have different pass‐through effects on import prices, i.e. whether the exchange rate pass‐through is symmetric or asymmetric. The findings of the study suggest that ERPT in South Africa is incomplete but relatively high. Furthermore, ERPT is found to be higher in periods of rand depreciation than appreciation, which supports the binding quantity constraint theory. There is also evidence to suggest that pass‐through is slightly higher in periods of small changes than large changes in the exchange rate in harmony with the menu cost theory when the invoices are denominated in the exporters' currency.
- Full Text:
- Date Issued: 2009
Exploratory mathematics talk in a second language: a sociolinguistic perspective:
- Graven, Mellony, Robertson, Sally-Ann
- Authors: Graven, Mellony , Robertson, Sally-Ann
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69907 , vital:29594 , https://doi.org/10.1007/s11858-018-0952-2
- Description: This paper illuminates challenges confronting teachers and students at the literacy/numeracy interface in contexts where students have not developed sufficient English language proficiency to be learning mathematics through English but, due to socio-politically and economically driven perceptions are being taught in English. We analyse transcript data of classroom talk in a South African grade 4 mathematics lesson on fractions. Together with interview data, the lesson data highlight some of the consequences students’ diminished access to their home language appear to have on their access to mathematical meaning-making.
- Full Text:
- Date Issued: 2009
- Authors: Graven, Mellony , Robertson, Sally-Ann
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69907 , vital:29594 , https://doi.org/10.1007/s11858-018-0952-2
- Description: This paper illuminates challenges confronting teachers and students at the literacy/numeracy interface in contexts where students have not developed sufficient English language proficiency to be learning mathematics through English but, due to socio-politically and economically driven perceptions are being taught in English. We analyse transcript data of classroom talk in a South African grade 4 mathematics lesson on fractions. Together with interview data, the lesson data highlight some of the consequences students’ diminished access to their home language appear to have on their access to mathematical meaning-making.
- Full Text:
- Date Issued: 2009
Exploring job search and the causes of endogenous unemployment: evidence from Duncan Village, South Africa
- Authors: Duff, Patrick Alexander
- Date: 2009
- Subjects: Unemployment , Unemployment -- Social aspects -- South Africa -- East London -- Duncan Village , Job hunting -- South Africa -- East London -- Duncan Village , Labor market -- South Africa
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: vital:1026
- Description: Despite high rates of unemployment in South Africa, there is little consensus about its origins and solutions to the problem. Job search (how and when people search for work)is one aspect of the unemployment problem. Job search is shown to be a complex process strongly linked to the endogenous structure of the labour market. The flaws in traditional methods (theoretical and measurement) highlight this. Using data from a tailor-made survey in Duncan Village (a peri-urban area in Buffalo City, South Africa) the research examines factors that influence the effectiveness of job search. The results show that mode of search (how people look for work) is used as a signal by employers. Degrees of success are stratified amongst searchers using either ‘word of mouth’, place-to-place or formal modes of search. The thesis provides a method-test to reveal a complex body of evidence that has yet to be fully explored by practitioners in this field.
- Full Text:
- Date Issued: 2009
- Authors: Duff, Patrick Alexander
- Date: 2009
- Subjects: Unemployment , Unemployment -- Social aspects -- South Africa -- East London -- Duncan Village , Job hunting -- South Africa -- East London -- Duncan Village , Labor market -- South Africa
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: vital:1026
- Description: Despite high rates of unemployment in South Africa, there is little consensus about its origins and solutions to the problem. Job search (how and when people search for work)is one aspect of the unemployment problem. Job search is shown to be a complex process strongly linked to the endogenous structure of the labour market. The flaws in traditional methods (theoretical and measurement) highlight this. Using data from a tailor-made survey in Duncan Village (a peri-urban area in Buffalo City, South Africa) the research examines factors that influence the effectiveness of job search. The results show that mode of search (how people look for work) is used as a signal by employers. Degrees of success are stratified amongst searchers using either ‘word of mouth’, place-to-place or formal modes of search. The thesis provides a method-test to reveal a complex body of evidence that has yet to be fully explored by practitioners in this field.
- Full Text:
- Date Issued: 2009
Exploring Learner Participation in Waste-Management Activities in a Rural Botswana Primary School
- Authors: Silo, Nthalivi
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386509 , vital:68148 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122820"
- Description: In Botswana, participation in environmental learning activities has been perceived as a central component of environmental education in formal education. Driven by the need to implement the objective of making the participatory approach part of the infusion of environmental education in the school curriculum as prescribed by the infusion policy, Botswana schools have come up with initiatives to involve learners in environmental education activities that seem to have ‘a direct, perceived benefit to the learners’ (NEESAP, 2007:9). Within this approach it is expected that learners should participate in these activities. However, Ketlhoilwe (2007) revealed that there has been a normalisation of environmental education into existing school culture through equating waste-management activities with environmental education. This generally entails cleaning activities by learners to maintain ‘clean schools’, which is directly associated with environmental education. Drawing from detailed case study data in one rural primary school with Standard 6 learners, I used Cultural Historical Activity Theory to investigate and explain how learners participate in these waste-management activities. Findings from this study revealed that attempts by teachers to meet the policy imperative through prescription of rules, and ascribing roles to learners in waste-management activities, create tensions. This gave rise to an elusive object of learner participation, as the purpose for their participation in these activities is not clear.
- Full Text:
- Date Issued: 2009
- Authors: Silo, Nthalivi
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386509 , vital:68148 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122820"
- Description: In Botswana, participation in environmental learning activities has been perceived as a central component of environmental education in formal education. Driven by the need to implement the objective of making the participatory approach part of the infusion of environmental education in the school curriculum as prescribed by the infusion policy, Botswana schools have come up with initiatives to involve learners in environmental education activities that seem to have ‘a direct, perceived benefit to the learners’ (NEESAP, 2007:9). Within this approach it is expected that learners should participate in these activities. However, Ketlhoilwe (2007) revealed that there has been a normalisation of environmental education into existing school culture through equating waste-management activities with environmental education. This generally entails cleaning activities by learners to maintain ‘clean schools’, which is directly associated with environmental education. Drawing from detailed case study data in one rural primary school with Standard 6 learners, I used Cultural Historical Activity Theory to investigate and explain how learners participate in these waste-management activities. Findings from this study revealed that attempts by teachers to meet the policy imperative through prescription of rules, and ascribing roles to learners in waste-management activities, create tensions. This gave rise to an elusive object of learner participation, as the purpose for their participation in these activities is not clear.
- Full Text:
- Date Issued: 2009
Exploring relocation experiences of refugees and asylum seekers in Port Elizabeth
- Sibula, Nontutuzelo Rosemary
- Authors: Sibula, Nontutuzelo Rosemary
- Date: 2009
- Subjects: Refugees -- South Africa -- Port Elizabeth , Refugee camps -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9999 , http://hdl.handle.net/10948/1068 , Refugees -- South Africa -- Port Elizabeth , Refugee camps -- South Africa -- Port Elizabeth
- Description: Large numbers of migrants enter South Africa legally and illegally in search of a better life, personal safety and security (Pretorius, 2004:1). The research study explored and described experiences of refugees and asylum seekers in the host country, the challenges they encountered in the process of integration regarding families in their country of origin and their “new” families in the host country, the strategies they employed to get recognition even if it led to being involved in fraudulent activities. The research has also explored the impact of laws in the lives of refugees and asylum seekers for example the Refugee Act (Act 130 of 1998), the Immigration Act (Act 13 of 2002), the 1969 OAU Convention and the 1951 United Nations Convention. A qualitative research approach was used to frame the study, which employed an exploratory, descriptive and contextual research design so as to understand challenges experienced by refugees and asylum seekers. The sample for the study was a purposively selected sample recruited using the snowball sampling technique. As a means of collecting data semi-structured interviews were utilized. The eight steps as stipulated by Tesch (in Creswell, 1994) were used to analyse data. To ensure trustworthiness the four criteria as suggested by Guba (in Krefting, 1991) were applied, namely truth-value, applicability, consistency and neutrality. The findings and recommendations are made available by means of a research report The research findings were centered on the following themes: (1) Refugees and asylum seekers articulate a range of reasons behind the decision to leave their home country. (2) Refugees and asylum seekers express negative experiences regarding leaving their country of origin. (3) Refugees and asylum seekers experience a range of feelings as they enter the host country (4) Refugees and asylum seekers report that they and their families experience a number of challenges as a result of relocation (5) Refugees and asylum seekers employ negative and positive strategies to cope with challenges of relocation (6) Suggestions made by refugees and asylum seekers concerning the involvement of Social Workers (7) Suggestions made by refugees/asylum seekers to Home Affairs in terms of improving services to refugees and asylum seekers Substance findings: the results emerged from the data collected through the themes and sub-themes identified during data analysis. Conclusions and recommendations: Based on the findings conclusions were drawn and recommendations proposed from the findings.
- Full Text:
- Date Issued: 2009
- Authors: Sibula, Nontutuzelo Rosemary
- Date: 2009
- Subjects: Refugees -- South Africa -- Port Elizabeth , Refugee camps -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9999 , http://hdl.handle.net/10948/1068 , Refugees -- South Africa -- Port Elizabeth , Refugee camps -- South Africa -- Port Elizabeth
- Description: Large numbers of migrants enter South Africa legally and illegally in search of a better life, personal safety and security (Pretorius, 2004:1). The research study explored and described experiences of refugees and asylum seekers in the host country, the challenges they encountered in the process of integration regarding families in their country of origin and their “new” families in the host country, the strategies they employed to get recognition even if it led to being involved in fraudulent activities. The research has also explored the impact of laws in the lives of refugees and asylum seekers for example the Refugee Act (Act 130 of 1998), the Immigration Act (Act 13 of 2002), the 1969 OAU Convention and the 1951 United Nations Convention. A qualitative research approach was used to frame the study, which employed an exploratory, descriptive and contextual research design so as to understand challenges experienced by refugees and asylum seekers. The sample for the study was a purposively selected sample recruited using the snowball sampling technique. As a means of collecting data semi-structured interviews were utilized. The eight steps as stipulated by Tesch (in Creswell, 1994) were used to analyse data. To ensure trustworthiness the four criteria as suggested by Guba (in Krefting, 1991) were applied, namely truth-value, applicability, consistency and neutrality. The findings and recommendations are made available by means of a research report The research findings were centered on the following themes: (1) Refugees and asylum seekers articulate a range of reasons behind the decision to leave their home country. (2) Refugees and asylum seekers express negative experiences regarding leaving their country of origin. (3) Refugees and asylum seekers experience a range of feelings as they enter the host country (4) Refugees and asylum seekers report that they and their families experience a number of challenges as a result of relocation (5) Refugees and asylum seekers employ negative and positive strategies to cope with challenges of relocation (6) Suggestions made by refugees and asylum seekers concerning the involvement of Social Workers (7) Suggestions made by refugees/asylum seekers to Home Affairs in terms of improving services to refugees and asylum seekers Substance findings: the results emerged from the data collected through the themes and sub-themes identified during data analysis. Conclusions and recommendations: Based on the findings conclusions were drawn and recommendations proposed from the findings.
- Full Text:
- Date Issued: 2009
Exploring risk related to future climates through role-playing games: the African catchment game
- Rowntree, Kate M, Fraenkel, Linda A, Fox, Roddy C
- Authors: Rowntree, Kate M , Fraenkel, Linda A , Fox, Roddy C
- Date: 2009
- Language: English
- Type: Conference paper
- Identifier: vital:6671 , http://hdl.handle.net/10962/d1006807
- Description: Risk is the result of two interacting components: hazard and vulnerability. Climatic hazards are related to extrinsic factors such as drought or severe storms. Vul- nerability is the result of intrinsic factors that often arise from the socio-political- economic context. The interplay of risk and vulnerability is difficult to predict. Although computer models have been widely used to forecast climate related risk, albeit with con- siderable uncertainty, they can never capture sufficiently the vulnerability of human sys- tems to these hazards. Role-playing games can be used more realistically to simulate pos- sible outcomes of different climate change scenarios, and allow players to reflect on their significance. The authors have developed the African Catchment Game to simulate a wa- ter scarce African country. Risk can be modelled mechanistically by changing the nature of the annual rainfall input. Vulnerability can in part be modelled by changing the start- ing parameters (such as access to land and resources) and, secondly, through the unpredictable response of players to game dynamics. Players’ reflections demonstrate that through the game they become more aware of the concept of risk and the complex response of individuals and societies that determine their vulnerability to climatic hazards. This paper reflects on the potential for developing the game further as a tool for participatory learning around climate change, based on the authors’ experience of playing the game with participants from South Africa.
- Full Text:
- Date Issued: 2009
- Authors: Rowntree, Kate M , Fraenkel, Linda A , Fox, Roddy C
- Date: 2009
- Language: English
- Type: Conference paper
- Identifier: vital:6671 , http://hdl.handle.net/10962/d1006807
- Description: Risk is the result of two interacting components: hazard and vulnerability. Climatic hazards are related to extrinsic factors such as drought or severe storms. Vul- nerability is the result of intrinsic factors that often arise from the socio-political- economic context. The interplay of risk and vulnerability is difficult to predict. Although computer models have been widely used to forecast climate related risk, albeit with con- siderable uncertainty, they can never capture sufficiently the vulnerability of human sys- tems to these hazards. Role-playing games can be used more realistically to simulate pos- sible outcomes of different climate change scenarios, and allow players to reflect on their significance. The authors have developed the African Catchment Game to simulate a wa- ter scarce African country. Risk can be modelled mechanistically by changing the nature of the annual rainfall input. Vulnerability can in part be modelled by changing the start- ing parameters (such as access to land and resources) and, secondly, through the unpredictable response of players to game dynamics. Players’ reflections demonstrate that through the game they become more aware of the concept of risk and the complex response of individuals and societies that determine their vulnerability to climatic hazards. This paper reflects on the potential for developing the game further as a tool for participatory learning around climate change, based on the authors’ experience of playing the game with participants from South Africa.
- Full Text:
- Date Issued: 2009
Exploring the consequences of perceptions of the divine, and the church, in the making of self-identity: a case study of congregants from Roman Catholic and Charismatic communities in East London, South Africa
- Authors: Sundberg, Dianne
- Date: 2009
- Subjects: Giddens, Anthony Catholic Church -- South Africa -- East London -- Case studies Catholic Church -- Doctrines Glory of God -- Case studies Church -- South Africa -- East London -- Case studies Feminist theology -- South Africa Self -- Case studies Identity (Psychology) -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3298 , http://hdl.handle.net/10962/d1003086
- Description: This thesis explores the impact and consequences of the teachings of the church, perceptions of The Divine [God] and of Mary, in the making of personal identity. In spite of secularisation and the prediction that the church would collapse in the face of modern science, recent evidence suggests that - in its various forms - religion, and belief in a higher power remain important and potentially powerful aspects in society. A foundation stone of the Christian faith is the doctrine of Imago Dei: humanity created in the image of The Divine. Although not male, The Divine is repeatedly spoken of - and addressed - in anthropomorphic masculine terms, but perceived in gender-specific stereotypical terms. Alongside The Divine - in the Roman Catholic Church - is Mary, the mother of Jesus. She is spoken of in feminine terms, but is also perceived in gender-specific stereotypical terms. Although not officially considered to be divine, Mary fulfils important needs in the life of the believer and it is in this context that her influence is evaluated. The role of the church as a community - and social institution - is also explored, based on Giddens’ theories of identity development. Belonging to a church community can provide a context for relationship, continuity, and trust. However, this potentially positive environment can have negative implications on self-identity in that restrictions on self-expression and personal choice can be as limiting as the sense of belonging is liberating. The patriarchal nature of the church is deemed to be of immense relevance. In order to establish the role of the church, The Divine, and Mary in the making of self-identity, in-depth interviews were conducted with twelve research participants belonging to Charismatic and Roman Catholic congregations, and Giddens’ criteria for self-identity development was used as the standard for evaluating participants’ personal sense of self-identity. Explored from the perspective of feminist theology, the findings of this qualitative research project suggest that it is more than gender language regarding The Divine that affects the agent’s perception of The Divine, and that the role of the church in identity formation is not uniform in its influence. It also concludes that perceptions of Mary can be influential in the development of selfidentity.
- Full Text:
- Date Issued: 2009
- Authors: Sundberg, Dianne
- Date: 2009
- Subjects: Giddens, Anthony Catholic Church -- South Africa -- East London -- Case studies Catholic Church -- Doctrines Glory of God -- Case studies Church -- South Africa -- East London -- Case studies Feminist theology -- South Africa Self -- Case studies Identity (Psychology) -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3298 , http://hdl.handle.net/10962/d1003086
- Description: This thesis explores the impact and consequences of the teachings of the church, perceptions of The Divine [God] and of Mary, in the making of personal identity. In spite of secularisation and the prediction that the church would collapse in the face of modern science, recent evidence suggests that - in its various forms - religion, and belief in a higher power remain important and potentially powerful aspects in society. A foundation stone of the Christian faith is the doctrine of Imago Dei: humanity created in the image of The Divine. Although not male, The Divine is repeatedly spoken of - and addressed - in anthropomorphic masculine terms, but perceived in gender-specific stereotypical terms. Alongside The Divine - in the Roman Catholic Church - is Mary, the mother of Jesus. She is spoken of in feminine terms, but is also perceived in gender-specific stereotypical terms. Although not officially considered to be divine, Mary fulfils important needs in the life of the believer and it is in this context that her influence is evaluated. The role of the church as a community - and social institution - is also explored, based on Giddens’ theories of identity development. Belonging to a church community can provide a context for relationship, continuity, and trust. However, this potentially positive environment can have negative implications on self-identity in that restrictions on self-expression and personal choice can be as limiting as the sense of belonging is liberating. The patriarchal nature of the church is deemed to be of immense relevance. In order to establish the role of the church, The Divine, and Mary in the making of self-identity, in-depth interviews were conducted with twelve research participants belonging to Charismatic and Roman Catholic congregations, and Giddens’ criteria for self-identity development was used as the standard for evaluating participants’ personal sense of self-identity. Explored from the perspective of feminist theology, the findings of this qualitative research project suggest that it is more than gender language regarding The Divine that affects the agent’s perception of The Divine, and that the role of the church in identity formation is not uniform in its influence. It also concludes that perceptions of Mary can be influential in the development of selfidentity.
- Full Text:
- Date Issued: 2009
Exploring the discourses around ‘creativity’ and ‘critical thinking’ in a South African creative arts curriculum
- Authors: Belluigi, Dina Z
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482842 , vital:78694 , https://doi.org/10.1080/03075070802644911
- Description: Using critical discourse analysis to analyse the formative assessment method of a fine art studio practice curriculum, the author explores the espoused claim that both creativity and critical thinking are encouraged. Despite the prevalence of these often used terms, assessment practices and feedback were found to unwittingly encourage reproduction. A dominant negative dialectic at play in assessment practices was a modernist conception of the artist‐student. The climate created by the imbalance between creativity and criticality was found to impact negatively on students' approaches to learning as a result of being alienated from their desires. Focusing on the South African context, this case study contributes to global concerns about strategic and uncritical adoptions of politically expedient discourses in higher education.
- Full Text:
- Date Issued: 2009
- Authors: Belluigi, Dina Z
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/482842 , vital:78694 , https://doi.org/10.1080/03075070802644911
- Description: Using critical discourse analysis to analyse the formative assessment method of a fine art studio practice curriculum, the author explores the espoused claim that both creativity and critical thinking are encouraged. Despite the prevalence of these often used terms, assessment practices and feedback were found to unwittingly encourage reproduction. A dominant negative dialectic at play in assessment practices was a modernist conception of the artist‐student. The climate created by the imbalance between creativity and criticality was found to impact negatively on students' approaches to learning as a result of being alienated from their desires. Focusing on the South African context, this case study contributes to global concerns about strategic and uncritical adoptions of politically expedient discourses in higher education.
- Full Text:
- Date Issued: 2009
Exploring the statistical equivalence of the English and Xhosa versions of the Woodcock-Munõz Language Survey
- Authors: Ntantiso, Mzamo
- Date: 2009
- Subjects: Equivalence (Linguistics) , Woodcock-Muñoz Language Survey
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9952 , http://hdl.handle.net/10948/d1018620
- Description: This study explored statistical equivalence of the adapted Xhosa and English version of the Woodcock-Muñoz Language Survey (WMLS) by investigating group differences on each subscale, in terms of mean scores, index reliability, and item characteristics for two language groups. A Convenience quota sampling technique was used to select 188 Xhosa (n = 188) and 198 English (n = 198) learners from Grades 6 and 7 living in rural and urban Eastern Cape. The WMLS Xhosa and English versions were administered to learners in their first languages. Significant mean group differences were found, but differences were not found on the reliability indices, or mean item characteristics. This pointed in the direction of statistical equivalence. However, scrutiny of the item characteristics of the individual items per subscale indicated possible problems at an item level that need to be investigated further with differential functioning analyses. Thus, stringent DIF analyses were suggested for future research on DIF items before the versions of the WMLS can be considered as equivalent.
- Full Text:
- Date Issued: 2009
- Authors: Ntantiso, Mzamo
- Date: 2009
- Subjects: Equivalence (Linguistics) , Woodcock-Muñoz Language Survey
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9952 , http://hdl.handle.net/10948/d1018620
- Description: This study explored statistical equivalence of the adapted Xhosa and English version of the Woodcock-Muñoz Language Survey (WMLS) by investigating group differences on each subscale, in terms of mean scores, index reliability, and item characteristics for two language groups. A Convenience quota sampling technique was used to select 188 Xhosa (n = 188) and 198 English (n = 198) learners from Grades 6 and 7 living in rural and urban Eastern Cape. The WMLS Xhosa and English versions were administered to learners in their first languages. Significant mean group differences were found, but differences were not found on the reliability indices, or mean item characteristics. This pointed in the direction of statistical equivalence. However, scrutiny of the item characteristics of the individual items per subscale indicated possible problems at an item level that need to be investigated further with differential functioning analyses. Thus, stringent DIF analyses were suggested for future research on DIF items before the versions of the WMLS can be considered as equivalent.
- Full Text:
- Date Issued: 2009
Extending the NFComms: framework for bulk data transfers
- Nottingham, Alastair, Irwin, Barry V W
- Authors: Nottingham, Alastair , Irwin, Barry V W
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430164 , vital:72670 , https://doi.org/10.1145/1632149.1632170
- Description: Packet analysis is an important aspect of network security, which typi-cally relies on a flexible packet filtering system to extrapolate important packet information from each processed packet. Packet analysis is a computationally intensive, highly parallelisable task, and as such, clas-sification of large packet sets, such as those collected by a network tel-escope, can require significant processing time. We wish to improve upon this, through parallel classification on a GPU. In this paper, we first consider the OpenCL architecture and its applicability to packet analy-sis. We then introduce a number of packet demultiplexing and routing algorithms, and finally present a discussion on how some of these techniques may be leveraged within a GPGPU context to improve packet classification speeds.
- Full Text:
- Date Issued: 2009
- Authors: Nottingham, Alastair , Irwin, Barry V W
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430164 , vital:72670 , https://doi.org/10.1145/1632149.1632170
- Description: Packet analysis is an important aspect of network security, which typi-cally relies on a flexible packet filtering system to extrapolate important packet information from each processed packet. Packet analysis is a computationally intensive, highly parallelisable task, and as such, clas-sification of large packet sets, such as those collected by a network tel-escope, can require significant processing time. We wish to improve upon this, through parallel classification on a GPU. In this paper, we first consider the OpenCL architecture and its applicability to packet analy-sis. We then introduce a number of packet demultiplexing and routing algorithms, and finally present a discussion on how some of these techniques may be leveraged within a GPGPU context to improve packet classification speeds.
- Full Text:
- Date Issued: 2009
Facilitating banking finance access for BBBEE firms in the Southern Cape area
- Authors: Kroukamp, Thelma
- Date: 2009
- Subjects: Small business -- South Africa -- Finance , Business enterprises, Black -- South Africa , Business enterprises -- Economic aspects -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8706 , http://hdl.handle.net/10948/996 , Small business -- South Africa -- Finance , Business enterprises, Black -- South Africa , Business enterprises -- Economic aspects -- South Africa
- Description: Studies have shown that BBBEE parties are unsuccessful in raising banking finance due to a number of reasons. The objective of the enactment of the Broad Based Black Economic Empowerment (BBBEE) Act is primarily to promote the participation of black people in the economy. The measurement of BBBEE is determined by the codes of good practice for Qualifying Small Enterprises (QSE), which consists of seven elements namely: ownership, management control, employment equity, skills development, preferential procurement, enterprise development and socio-economic development. Enterprises with annual turnover ranging from R5 million and R35 million qualify as QSE. These elements measure the level of BBBEE status. The enactment of the National Credit Act replaced the Usury Act, 1968 and the Credit Agreements Act, 1980. The objective of the act is to promote accessibility to the credit market and to prevent the over-indebtedness of consumers. The Act is applicable to natural persons with contractual capacity and juristic persons with monetary assets or annual turnover of less than R1 million. This study aims to establish the facilitation of access to banking finance for BBBEE SME’S within the George and Mossel Bay area as these towns form part of the Garden Route Business Banking Division of Nedbank. The effect of the BBBEE and NCA on the accessing of banking finance was studied and analysed. Credit applications are subject to stringent credit scoring systems to rate applicants, monitor performance and manage accounts. The Basel rating which measures the minimum level of capital a bank should hold to protect investors determines the interest rate charged for loans. These ratings affect the accessibility of banking finance. A framework for bank and SME relationship building shows the relationships between: • The accounts manager’s role in relationship management; • Branch staff role in relationship management; • Corporate policies as part of relationship management. A survey was conducted in the form of a questionnaire in order to obtain primary information from two sample groups, banking officials and BBBEE clients to establish the relationship between the two sample groups. Quantitative techniques were used and the data obtained from the two sample groups were analysed. The study revealed that the by establishment of relationships between BBBEE clients and banking officials would facilitate access to banking.
- Full Text:
- Date Issued: 2009
- Authors: Kroukamp, Thelma
- Date: 2009
- Subjects: Small business -- South Africa -- Finance , Business enterprises, Black -- South Africa , Business enterprises -- Economic aspects -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8706 , http://hdl.handle.net/10948/996 , Small business -- South Africa -- Finance , Business enterprises, Black -- South Africa , Business enterprises -- Economic aspects -- South Africa
- Description: Studies have shown that BBBEE parties are unsuccessful in raising banking finance due to a number of reasons. The objective of the enactment of the Broad Based Black Economic Empowerment (BBBEE) Act is primarily to promote the participation of black people in the economy. The measurement of BBBEE is determined by the codes of good practice for Qualifying Small Enterprises (QSE), which consists of seven elements namely: ownership, management control, employment equity, skills development, preferential procurement, enterprise development and socio-economic development. Enterprises with annual turnover ranging from R5 million and R35 million qualify as QSE. These elements measure the level of BBBEE status. The enactment of the National Credit Act replaced the Usury Act, 1968 and the Credit Agreements Act, 1980. The objective of the act is to promote accessibility to the credit market and to prevent the over-indebtedness of consumers. The Act is applicable to natural persons with contractual capacity and juristic persons with monetary assets or annual turnover of less than R1 million. This study aims to establish the facilitation of access to banking finance for BBBEE SME’S within the George and Mossel Bay area as these towns form part of the Garden Route Business Banking Division of Nedbank. The effect of the BBBEE and NCA on the accessing of banking finance was studied and analysed. Credit applications are subject to stringent credit scoring systems to rate applicants, monitor performance and manage accounts. The Basel rating which measures the minimum level of capital a bank should hold to protect investors determines the interest rate charged for loans. These ratings affect the accessibility of banking finance. A framework for bank and SME relationship building shows the relationships between: • The accounts manager’s role in relationship management; • Branch staff role in relationship management; • Corporate policies as part of relationship management. A survey was conducted in the form of a questionnaire in order to obtain primary information from two sample groups, banking officials and BBBEE clients to establish the relationship between the two sample groups. Quantitative techniques were used and the data obtained from the two sample groups were analysed. The study revealed that the by establishment of relationships between BBBEE clients and banking officials would facilitate access to banking.
- Full Text:
- Date Issued: 2009
Factors affecting AIDS orphans' from accessing voluntary counselling and testing (VCT)
- Authors: Maama, Lineo Bernadette
- Date: 2009
- Subjects: Children of AIDS patients -- South Africa , HIV infections -- South Africa -- Testing , Orphans -- Services for
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10000 , http://hdl.handle.net/10948/1046 , Children of AIDS patients -- South Africa , HIV infections -- South Africa -- Testing , Orphans -- Services for
- Description: The study seeks to explore and identify factors that prevent AIDS orphans in presenting themselves for Voluntary Counselling and Testing (VCT). Socio-cultural factors, notably, stigma and the resultant discrimination by community members, have been presented by many researchers as the main aetiological factors that hinder the use of VCT by AIDS orphans. It is on the basis of this that this study was conducted to identify factors that hinder AIDS orphans from accessing VCT. The study used a qualitative approach following an explorative and descriptive, contextual research design and was conducted at Ubuntu Education Fund, Port Elizabeth. Purposive sampling was used to determine a sample of AIDS orphans. Participants of the study had to be orphaned as a result of AIDS, isiXhosa-speaking, between 12-17 years, living in the care of a primary care-giver and had not presented themselves for VCT. Data was collected by means of semi-structured interviews. Semi-structured interviews are suitable in cases where the researcher is interested in an issue that is complex or personal (De Vos, Strydom, Fouche and Deloport, 2005). Data was analyzed according to the framework provided by Tesch (1990) as described in Creswell (2003). The major findings of this study were that people are locked in a ‘poverty-of-the mind cycle’, in respect of HIV and AIDS, and this is exacerbated by educational impoverishment and general poverty. The recommendations that emanated from this study are made from policy and service delivery perspectives. It is recommended that in order for AIDS orphans to access VCT they should be developed and empowered through sustainable programmes that enhance their capacities to the outmost realization of their potential. It is also recommended that health and other professionals should encourage AIDS orphans and community members to present themselves for VCT and thus curb the spread of HIV and AIDS.
- Full Text:
- Date Issued: 2009
- Authors: Maama, Lineo Bernadette
- Date: 2009
- Subjects: Children of AIDS patients -- South Africa , HIV infections -- South Africa -- Testing , Orphans -- Services for
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10000 , http://hdl.handle.net/10948/1046 , Children of AIDS patients -- South Africa , HIV infections -- South Africa -- Testing , Orphans -- Services for
- Description: The study seeks to explore and identify factors that prevent AIDS orphans in presenting themselves for Voluntary Counselling and Testing (VCT). Socio-cultural factors, notably, stigma and the resultant discrimination by community members, have been presented by many researchers as the main aetiological factors that hinder the use of VCT by AIDS orphans. It is on the basis of this that this study was conducted to identify factors that hinder AIDS orphans from accessing VCT. The study used a qualitative approach following an explorative and descriptive, contextual research design and was conducted at Ubuntu Education Fund, Port Elizabeth. Purposive sampling was used to determine a sample of AIDS orphans. Participants of the study had to be orphaned as a result of AIDS, isiXhosa-speaking, between 12-17 years, living in the care of a primary care-giver and had not presented themselves for VCT. Data was collected by means of semi-structured interviews. Semi-structured interviews are suitable in cases where the researcher is interested in an issue that is complex or personal (De Vos, Strydom, Fouche and Deloport, 2005). Data was analyzed according to the framework provided by Tesch (1990) as described in Creswell (2003). The major findings of this study were that people are locked in a ‘poverty-of-the mind cycle’, in respect of HIV and AIDS, and this is exacerbated by educational impoverishment and general poverty. The recommendations that emanated from this study are made from policy and service delivery perspectives. It is recommended that in order for AIDS orphans to access VCT they should be developed and empowered through sustainable programmes that enhance their capacities to the outmost realization of their potential. It is also recommended that health and other professionals should encourage AIDS orphans and community members to present themselves for VCT and thus curb the spread of HIV and AIDS.
- Full Text:
- Date Issued: 2009
Factors enabling and constraining ICT implementation in schools: a multiple case study of three secondary schools in Lesotho
- Authors: Kalake, Matsitso
- Date: 2009
- Subjects: Education -- Lesotho Computer-assisted instruction -- Lesotho Information technology -- Lesotho Educational technology -- Lesotho Education, Secondary -- Lesotho -- Data processing Education -- Lesotho -- Computer network resources Educational innovations -- Lesotho Educational change -- Lesotho
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1858 , http://hdl.handle.net/10962/d1004539
- Description: This study focused on the implementation of ICTs in secondary schools in Lesotho. The main question addressed was: What are the enabling and constraining factors in the implementation of ICTs in schools? The work was undertaken in recognition of the fact that schools in the country were autonomously acquiring computers and using a variety of curricula without much coordination and policies from the government. There were factors encouraging schools to delve into this educational change: and challenges were already evident. This required further investigation. The research approach commenced with a critical review of the literature. Literature was drawn from developed and developing countries in order to understand the process of ICT implementation from a variety of contexts. The enquiry about the implementation process in all the countries focused on the rationale behind the use of ICTs in schools. ICT policies guiding implementation, principal leadership, teacher professional development and ICT resources. The literature review was followed by case studies of three secondary schools in Mafeteng district in Lesotho. Using both qualitative and quantitative methods of research, the study sought to determine from key people in three case study schools their overall understanding of how the process of implementation was carried out and what they perceived as enablers and constraints. The findings revealed that planning, access arrangements, training, support and to a lesser extent resources played a role in either impeding or encouraging the key ICT implementers at school and classroom level. Additionally, the key role of the principal and the MoE were highlighted in the study.
- Full Text:
- Date Issued: 2009
- Authors: Kalake, Matsitso
- Date: 2009
- Subjects: Education -- Lesotho Computer-assisted instruction -- Lesotho Information technology -- Lesotho Educational technology -- Lesotho Education, Secondary -- Lesotho -- Data processing Education -- Lesotho -- Computer network resources Educational innovations -- Lesotho Educational change -- Lesotho
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1858 , http://hdl.handle.net/10962/d1004539
- Description: This study focused on the implementation of ICTs in secondary schools in Lesotho. The main question addressed was: What are the enabling and constraining factors in the implementation of ICTs in schools? The work was undertaken in recognition of the fact that schools in the country were autonomously acquiring computers and using a variety of curricula without much coordination and policies from the government. There were factors encouraging schools to delve into this educational change: and challenges were already evident. This required further investigation. The research approach commenced with a critical review of the literature. Literature was drawn from developed and developing countries in order to understand the process of ICT implementation from a variety of contexts. The enquiry about the implementation process in all the countries focused on the rationale behind the use of ICTs in schools. ICT policies guiding implementation, principal leadership, teacher professional development and ICT resources. The literature review was followed by case studies of three secondary schools in Mafeteng district in Lesotho. Using both qualitative and quantitative methods of research, the study sought to determine from key people in three case study schools their overall understanding of how the process of implementation was carried out and what they perceived as enablers and constraints. The findings revealed that planning, access arrangements, training, support and to a lesser extent resources played a role in either impeding or encouraging the key ICT implementers at school and classroom level. Additionally, the key role of the principal and the MoE were highlighted in the study.
- Full Text:
- Date Issued: 2009
Factors influencing international students' choice of enrolling at higher education institutions via the internet
- Authors: Yang, Ning
- Date: 2009
- Subjects: Internet marketing -- South Africa , Education, Higher -- Marketing , Internet in higher education -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9338 , http://hdl.handle.net/10948/1084 , Internet marketing -- South Africa , Education, Higher -- Marketing , Internet in higher education -- South Africa
- Description: As the competition increase in the Higher Education industry, marketing departments of Higher Education Institutions view students as consumers and market their institutions. At the mean time, universities around the world encourage their international offices to increase the foreign student enrollments. This research investigates the factors influencing international students’ choice of enrolling at Higher Educational Institutions (HEI) via the internet: international students’ Internet use to facilitate information search and decision making. This survey of international students from Nelson Mandela Metropolitan University (NMMU) explored the Internet’s role in marketing international education. Based on this exploratory research, NMMU educational institutions gain insights of online customer service for successfully recruiting students. The results show that prospective overseas students do indeed use the internet. Overall evaluation of the factors influencing the use of the internet for enrolling at HEIs was determined by four factors: namely, perceived usefulness, consumer involvement, perceived ease of use and opinion leadership.
- Full Text:
- Date Issued: 2009
- Authors: Yang, Ning
- Date: 2009
- Subjects: Internet marketing -- South Africa , Education, Higher -- Marketing , Internet in higher education -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9338 , http://hdl.handle.net/10948/1084 , Internet marketing -- South Africa , Education, Higher -- Marketing , Internet in higher education -- South Africa
- Description: As the competition increase in the Higher Education industry, marketing departments of Higher Education Institutions view students as consumers and market their institutions. At the mean time, universities around the world encourage their international offices to increase the foreign student enrollments. This research investigates the factors influencing international students’ choice of enrolling at Higher Educational Institutions (HEI) via the internet: international students’ Internet use to facilitate information search and decision making. This survey of international students from Nelson Mandela Metropolitan University (NMMU) explored the Internet’s role in marketing international education. Based on this exploratory research, NMMU educational institutions gain insights of online customer service for successfully recruiting students. The results show that prospective overseas students do indeed use the internet. Overall evaluation of the factors influencing the use of the internet for enrolling at HEIs was determined by four factors: namely, perceived usefulness, consumer involvement, perceived ease of use and opinion leadership.
- Full Text:
- Date Issued: 2009
Factors influencing job satisfaction
- Authors: Hansia, Bradley L
- Date: 2009
- Subjects: Job satisfaction
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8688 , http://hdl.handle.net/10948/1111 , Job satisfaction
- Description: The harassed boss who faces an office full of mutinous, recalcitrant staff every morning may not believe it, but half of South Africa’s employees love their jobs and their employers. That’s according to TNS Research Surveys, which recently released the results of a survey into employee wellbeing and commitment. TNS director Neil Higgs issued a caution, though: because of the tough economic times, employers are likely to be stuck with the malcontents among their staff for longer than they might like (Ferreira, 2009). From the above mentioned it can be deduced that there are many employees who are currently not satisfied with their jobs. This poses a danger for employers and their productivity, as an unsatisfied employee is likely to be an unproductive employee. Satisfied employees are likely to make a better contribution to the economic growth of this country as more drive and motivation will be shown in the workplace. In these tough economic times, those employees who are not satisfied with their jobs are less likely to find employment elsewhere as mentioned above. The main purpose of this research paper was to identify certain factors impacting on job satisfaction. The first step was to complete a literature study on the selected factors which impacts on job satisfaction. The factors selected were that of recruitment and selection, rewards offered by employers, personality of employees and leadership characteristics of superiors. The literature study revealed which methods to use in attempting to deal with the selected factors impacting on job satisfaction. Secondly, the views of staff in various departments and views of staff specifically in the Human Resources department of the selected company were asked various questions in an empirical study. These questions were based on the selected factors mentioned in the previous paragraph, this involved them completing questionnaires. v Based on the findings of the literature study and the empirical study, the last step was to make recommendations to the selected company on how to improve job satisfaction of employees. Recommendations were also made as to what to look for to make it easier in recruiting new employees, who are likely to have enhanced job satisfaction for the good of the company.
- Full Text:
- Date Issued: 2009
- Authors: Hansia, Bradley L
- Date: 2009
- Subjects: Job satisfaction
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8688 , http://hdl.handle.net/10948/1111 , Job satisfaction
- Description: The harassed boss who faces an office full of mutinous, recalcitrant staff every morning may not believe it, but half of South Africa’s employees love their jobs and their employers. That’s according to TNS Research Surveys, which recently released the results of a survey into employee wellbeing and commitment. TNS director Neil Higgs issued a caution, though: because of the tough economic times, employers are likely to be stuck with the malcontents among their staff for longer than they might like (Ferreira, 2009). From the above mentioned it can be deduced that there are many employees who are currently not satisfied with their jobs. This poses a danger for employers and their productivity, as an unsatisfied employee is likely to be an unproductive employee. Satisfied employees are likely to make a better contribution to the economic growth of this country as more drive and motivation will be shown in the workplace. In these tough economic times, those employees who are not satisfied with their jobs are less likely to find employment elsewhere as mentioned above. The main purpose of this research paper was to identify certain factors impacting on job satisfaction. The first step was to complete a literature study on the selected factors which impacts on job satisfaction. The factors selected were that of recruitment and selection, rewards offered by employers, personality of employees and leadership characteristics of superiors. The literature study revealed which methods to use in attempting to deal with the selected factors impacting on job satisfaction. Secondly, the views of staff in various departments and views of staff specifically in the Human Resources department of the selected company were asked various questions in an empirical study. These questions were based on the selected factors mentioned in the previous paragraph, this involved them completing questionnaires. v Based on the findings of the literature study and the empirical study, the last step was to make recommendations to the selected company on how to improve job satisfaction of employees. Recommendations were also made as to what to look for to make it easier in recruiting new employees, who are likely to have enhanced job satisfaction for the good of the company.
- Full Text:
- Date Issued: 2009