"Soliloquy: the untold story of Sleeping Beauty's dreams"; a re-vision of Charles Perrault's "The sleeping beauty in the woods."
- Authors: Ledwick, Lisa-Mari
- Date: 2015
- Subjects: Perrault, Charles, 1628-1703 , Symbolism in fairy tales , Sleeping Beauty (Tale) in literature
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/3155 , vital:20405
- Description: Taken as a whole, the purpose of the practical and theoretical components of this research aims to contextualise and present a contemporary fairy tale heroine who recuperates and re-values traditional aspects of femininity within a feminist context.
- Full Text:
- Date Issued: 2015
- Authors: Ledwick, Lisa-Mari
- Date: 2015
- Subjects: Perrault, Charles, 1628-1703 , Symbolism in fairy tales , Sleeping Beauty (Tale) in literature
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/3155 , vital:20405
- Description: Taken as a whole, the purpose of the practical and theoretical components of this research aims to contextualise and present a contemporary fairy tale heroine who recuperates and re-values traditional aspects of femininity within a feminist context.
- Full Text:
- Date Issued: 2015
A comparative study of performance and efficiency of a tube and fin type domestic solar water heat collector
- Authors: Kleyn, Gysbert
- Date: 2015
- Subjects: Solar collectors , Solar water heaters -- Testing , Solar heating
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/7959 , vital:24329
- Description: The main purpose of this research project was to do a comparative study, by identifying a testing methodology for transient conditions, through which to allow the expression of the relative thermal performance of two DSWH collectors in comparison. The study started off by considering literature about Solar Domestic Water Heaters and National Standards-based test methods, most of which were for Steady State testing conditions. Thereafter establishing a testing methodology and setup, identifying factors to be considered. The results were analyzed and conclusions drawn. The hypothesis was to allow the reduction in the complexity of testing equipment and methods, and by doing transient condition testing and still utilizing the Hottel-Whillier-Bliss relationship as a way of expressing efficiency, the hypothesis was proven.
- Full Text:
- Date Issued: 2015
- Authors: Kleyn, Gysbert
- Date: 2015
- Subjects: Solar collectors , Solar water heaters -- Testing , Solar heating
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/7959 , vital:24329
- Description: The main purpose of this research project was to do a comparative study, by identifying a testing methodology for transient conditions, through which to allow the expression of the relative thermal performance of two DSWH collectors in comparison. The study started off by considering literature about Solar Domestic Water Heaters and National Standards-based test methods, most of which were for Steady State testing conditions. Thereafter establishing a testing methodology and setup, identifying factors to be considered. The results were analyzed and conclusions drawn. The hypothesis was to allow the reduction in the complexity of testing equipment and methods, and by doing transient condition testing and still utilizing the Hottel-Whillier-Bliss relationship as a way of expressing efficiency, the hypothesis was proven.
- Full Text:
- Date Issued: 2015
A framework for the integration of skilled / professional self-initiated expatrites into Qatari organisations
- Pieterse, Regan Christopher Ebrahim
- Authors: Pieterse, Regan Christopher Ebrahim
- Date: 2015
- Subjects: Human capital -- Qatar , Cultural relations
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/3074 , vital:20396
- Description: The main research problem in this study was to identify a framework that can be utilised for the integration of skilled/professional self-initiated expatriates (SIEs) into Qatari organisations. The main research problem gave rise to six sub-problems that were addressed through the following actions: A literature study was conducted to explore what the existing literature revealed about facilitating successful expatriate integration. In particular, the theoretical guidelines for expatriate recruitment and selection, orientation and cross-cultural integration were presented and discussed. Special attention was given to community embeddedness. Semi-structured interviews were conducted with ten members from the sample group. These were undertaken to obtain their views on the expectations that their organisations had of them upon their arrival in Qatar, as well as on what they felt made it easy or difficult for them to adjust. Subsequently, a structured survey questionnaire was developed using the theoretical guidelines from the literature review and the insights gained from the semi-structured interviews. The survey was conducted in Qatar and administered to 102 skilled/professional self-initiated expatriates from diverse backgrounds and three work sectors, namely: healthcare, education and aviation. The final sample size was 94 due to eight questionnaires not being completed properly. The results from the empirical study revealed a gap between theoretical guidelines/ best practices and the recruitment and selection, orientation and cross-cultural integration practices at the respondents’ organisations. The knowledge gained from the existing literature and from the quantitative and qualitative results of the empirical study were combined and developed into a framework for the integration of skilled/professional self-initiated expatriates into Qatari organisations (refer to Table 5.35). Areas that were identified for improvement related to issues such as the need for Qatari organisations to: provide SIEs with more comprehensive information regarding the role that they will play as knowledge workers with regard to the development/training of Qatari nationals; implement a more comprehensive recruitment, selection and orientation process, and implement a more robust set of strategies to enhance the cross-cultural integration of their expatriate workers. Globalisation has fuelled organisations and countries towards building and/or strengthening knowledge-based economies. However in order to build competitive, knowledge-based economies, organisations and countries require skilled/professional workers. Skilled/professional self-initiated expatriates can provide Qatar with a pipeline of knowledge workers to support the growth of their emerging knowledge-based economy. As such, a framework that will enhance the integration of self-initiated expatriates into Qatari organisations is of paramount importance, specifically with regard to fostering performance excellence, satisfaction and community embeddedness within the Qatari work and cultural system.
- Full Text:
- Date Issued: 2015
- Authors: Pieterse, Regan Christopher Ebrahim
- Date: 2015
- Subjects: Human capital -- Qatar , Cultural relations
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/3074 , vital:20396
- Description: The main research problem in this study was to identify a framework that can be utilised for the integration of skilled/professional self-initiated expatriates (SIEs) into Qatari organisations. The main research problem gave rise to six sub-problems that were addressed through the following actions: A literature study was conducted to explore what the existing literature revealed about facilitating successful expatriate integration. In particular, the theoretical guidelines for expatriate recruitment and selection, orientation and cross-cultural integration were presented and discussed. Special attention was given to community embeddedness. Semi-structured interviews were conducted with ten members from the sample group. These were undertaken to obtain their views on the expectations that their organisations had of them upon their arrival in Qatar, as well as on what they felt made it easy or difficult for them to adjust. Subsequently, a structured survey questionnaire was developed using the theoretical guidelines from the literature review and the insights gained from the semi-structured interviews. The survey was conducted in Qatar and administered to 102 skilled/professional self-initiated expatriates from diverse backgrounds and three work sectors, namely: healthcare, education and aviation. The final sample size was 94 due to eight questionnaires not being completed properly. The results from the empirical study revealed a gap between theoretical guidelines/ best practices and the recruitment and selection, orientation and cross-cultural integration practices at the respondents’ organisations. The knowledge gained from the existing literature and from the quantitative and qualitative results of the empirical study were combined and developed into a framework for the integration of skilled/professional self-initiated expatriates into Qatari organisations (refer to Table 5.35). Areas that were identified for improvement related to issues such as the need for Qatari organisations to: provide SIEs with more comprehensive information regarding the role that they will play as knowledge workers with regard to the development/training of Qatari nationals; implement a more comprehensive recruitment, selection and orientation process, and implement a more robust set of strategies to enhance the cross-cultural integration of their expatriate workers. Globalisation has fuelled organisations and countries towards building and/or strengthening knowledge-based economies. However in order to build competitive, knowledge-based economies, organisations and countries require skilled/professional workers. Skilled/professional self-initiated expatriates can provide Qatar with a pipeline of knowledge workers to support the growth of their emerging knowledge-based economy. As such, a framework that will enhance the integration of self-initiated expatriates into Qatari organisations is of paramount importance, specifically with regard to fostering performance excellence, satisfaction and community embeddedness within the Qatari work and cultural system.
- Full Text:
- Date Issued: 2015
A skills profile of female managers in the construction and engineering industry of Nelson Mandela Bay
- Authors: Mackenzie, Caleigh Simone
- Date: 2015
- Subjects: Women executives -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/2824 , vital:16229
- Description: The male-dominated nature of the construction and engineering industries is a well-known phenomenon. This research provides insight into the skills required by female managers in order to manage successfully in these industries dominated by males. The primary purpose of this research is to identify the skills profile of female managers in the construction and engineering industry of Nelson Mandela Bay (NMB). Even though the number of female managers in senior management positions is increasing, South Africa still has a long way to go before men and women are considered equal with regard to the roles that they play and the positions that they occupy in the work-place (Mail & Guardian Online, 2012: 1). Therefore, the aim of this study is to identify the skills needed by female managers in the construction and engineering industry of NMB. This study attempts to provide answers to the following research questions: What are the management skills a manager should have? What is the skills profile of female managers in the construction and engineering sector of NMB? Is there a skills gap in the current literature? The literature overview was conducted on roles, functions and skills of managers as well as female managers in male-dominated industries from journals and books published between 2000 and 2014. Topics researched included the roles and functions of managers, generic management skills and industry-specific management skills, females as managers and leaders, barriers to managerial success for females, and the nature of the construction and engineering industries. Chapter four discusses the research design and methodology used in this study. The quantitative research approach was used in order to solve the main problem of this study. A non-probability sampling method was used for this study. Purposive sampling and snowball sampling methods were used. These methods seemed most appropriate given the small sample size, the fact that self-completion questionnaires were used to gather data from female managers, and the fact that the researcher investigated only the skills exhibited data. The Master Builders’ Association was contacted in order to identify respondents in construction. Respondents in engineering were identified using snowball sampling, which forms part of non-probability sampling. A questionnaire was developed based on the management skills identified in the literature study conducted. Primary data was collected through e-mail distribution of a cover letter requesting the respondent to complete the attached questionnaire. The data was then loaded on an Excel data base for further use and analysis. Once primary data had been collected, it was analysed using appropriate statistical methods. Descriptive statistics were used to analyse the data to determine the skills’ profile of female managers in the construction and engineering industry of NMB, as reflected in the collected data. These results were then used to identify areas for further research. The analysis revealed that the majority of the sample was between the ages of 29 and 38 years old and employed in the construction industry. The sample mainly consisted of top level managers with a Masters as their highest educational qualification (41 per cent). The majority of the respondents agreed that conceptual, technical, political, analytic, administrative, and diagnostic skills are required to effectively manage an organisation. Based on the findings, the majority of the respondents strongly agreed that leadership, planning, organising, conflict management, and project management skills are industry-specific management skills required to manage effectively in the construction and engineering industry. The majority of respondents indicated that they had learned these skills through workplace training and experience. The majority of the respondents agree that female managers excel in certain managerial skills and even believe that female managers possess different skills to those of male managers. The results of this study are expected to create awareness of the current state of the construction and engineering industry in NMB. The information will enable employers as well as FET institutions to create interventions and equip females with the necessary skills to become engineering and construction professionals.
- Full Text:
- Date Issued: 2015
- Authors: Mackenzie, Caleigh Simone
- Date: 2015
- Subjects: Women executives -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/2824 , vital:16229
- Description: The male-dominated nature of the construction and engineering industries is a well-known phenomenon. This research provides insight into the skills required by female managers in order to manage successfully in these industries dominated by males. The primary purpose of this research is to identify the skills profile of female managers in the construction and engineering industry of Nelson Mandela Bay (NMB). Even though the number of female managers in senior management positions is increasing, South Africa still has a long way to go before men and women are considered equal with regard to the roles that they play and the positions that they occupy in the work-place (Mail & Guardian Online, 2012: 1). Therefore, the aim of this study is to identify the skills needed by female managers in the construction and engineering industry of NMB. This study attempts to provide answers to the following research questions: What are the management skills a manager should have? What is the skills profile of female managers in the construction and engineering sector of NMB? Is there a skills gap in the current literature? The literature overview was conducted on roles, functions and skills of managers as well as female managers in male-dominated industries from journals and books published between 2000 and 2014. Topics researched included the roles and functions of managers, generic management skills and industry-specific management skills, females as managers and leaders, barriers to managerial success for females, and the nature of the construction and engineering industries. Chapter four discusses the research design and methodology used in this study. The quantitative research approach was used in order to solve the main problem of this study. A non-probability sampling method was used for this study. Purposive sampling and snowball sampling methods were used. These methods seemed most appropriate given the small sample size, the fact that self-completion questionnaires were used to gather data from female managers, and the fact that the researcher investigated only the skills exhibited data. The Master Builders’ Association was contacted in order to identify respondents in construction. Respondents in engineering were identified using snowball sampling, which forms part of non-probability sampling. A questionnaire was developed based on the management skills identified in the literature study conducted. Primary data was collected through e-mail distribution of a cover letter requesting the respondent to complete the attached questionnaire. The data was then loaded on an Excel data base for further use and analysis. Once primary data had been collected, it was analysed using appropriate statistical methods. Descriptive statistics were used to analyse the data to determine the skills’ profile of female managers in the construction and engineering industry of NMB, as reflected in the collected data. These results were then used to identify areas for further research. The analysis revealed that the majority of the sample was between the ages of 29 and 38 years old and employed in the construction industry. The sample mainly consisted of top level managers with a Masters as their highest educational qualification (41 per cent). The majority of the respondents agreed that conceptual, technical, political, analytic, administrative, and diagnostic skills are required to effectively manage an organisation. Based on the findings, the majority of the respondents strongly agreed that leadership, planning, organising, conflict management, and project management skills are industry-specific management skills required to manage effectively in the construction and engineering industry. The majority of respondents indicated that they had learned these skills through workplace training and experience. The majority of the respondents agree that female managers excel in certain managerial skills and even believe that female managers possess different skills to those of male managers. The results of this study are expected to create awareness of the current state of the construction and engineering industry in NMB. The information will enable employers as well as FET institutions to create interventions and equip females with the necessary skills to become engineering and construction professionals.
- Full Text:
- Date Issued: 2015
An organic rankine cycle heat engine using a rock thermal battery as the heat source
- Authors: Humm, Jason Christopher
- Date: 2015
- Subjects: Heat engineering Renewable energy sources
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/10960 , vital:26861
- Description: Organic Rankine cycles (ORC) have unique properties that are well suited to power generation from low grade heat sources. It is envisaged that a domestic scale ORC Heat Engine can be developed that will be able to run off heat stored in a solar charged rock thermal battery. The use of a thermal battery as the heat source for the ORC system will provide the user with electricity during the day and for a number of hours into the night. The concept presented consists of four key components: rock thermal battery, 1 kW scroll expander, condenser and working fluid pump.
- Full Text:
- Date Issued: 2015
- Authors: Humm, Jason Christopher
- Date: 2015
- Subjects: Heat engineering Renewable energy sources
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/10960 , vital:26861
- Description: Organic Rankine cycles (ORC) have unique properties that are well suited to power generation from low grade heat sources. It is envisaged that a domestic scale ORC Heat Engine can be developed that will be able to run off heat stored in a solar charged rock thermal battery. The use of a thermal battery as the heat source for the ORC system will provide the user with electricity during the day and for a number of hours into the night. The concept presented consists of four key components: rock thermal battery, 1 kW scroll expander, condenser and working fluid pump.
- Full Text:
- Date Issued: 2015
Biomass potential and nutrient export of mature pinus radiata in the southern Cape region of South Africa
- Authors: Van Zyl, Salmon Johannes
- Date: 2015
- Subjects: Pinus radiata -- South Africa , Forest biomass -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4321 , vital:20584
- Description: South Africa lags behind the rest of the world with regard to the availability of allometric biomass information. There is a complete lack of site specific allometric data for Pinus radiata in the southern Cape region, impeding investment in the renewable energy sector. This shortcoming was addressed by developing up-scalable, single tree biomass models. These models quantify the aboveground biomass of rotation age P. radiata grown in the southern Cape across a range of site conditions. The models use diameter at breast height (DBH) to predict the aboveground component biomass. A nutrient loss risk potential was assigned to each biomass component. Nineteen trees were destructively harvested using a full fresh weight sampling approach. Basic density was determined using a water displacement method, while Newton’s volume equation was used for stemwood volume determination. Log linear models were simultaneously regressed through seemingly unrelated regression (SUR) using the “Systemfit” R statistical package to force component additivity. A categorical variable was applied to the models, grouping the data into two Site Index (SI) based categories, namely “Low” SI and “Medium to High” SI, to account for inter-site variability. The corrected Akaike Information Criteria (AICc) and coefficient of determination (R2) was used to determine the goodness of fit of the models. The McElroy R2 for the SUR system was 0.95. Biomass models were developed that are able to predict various tree component masses at high levels of certainty within site and stand attribute ranges similar to this study. The importance of accurate, site specific wood basic density was demonstrated by its substantial weighting on stem and hence total biomass. Results showed that the stemwood mean basic density range was between 503 kg m-3 and 517 kg m-3 for the “Low” SI sites and 458 kg m-3 for the “Medium to High” SI sites. Site quality can have a major impact on the models, particularly on poorer sites where stemwood production is proportionally less than other tree components. Total aboveground biomass was estimated to range between 58.61 odt ha-1 and 70.85 odt ha-1 for “Low” SI sites, and 185.31 odt ha-1 to 266.58 odt ha-1 for “Medium to High” SI sites. Stemwood biomass accounted for 65% of the total aboveground biomass for “Low” SI sites and 70% for “Medium to High” SI sites.
- Full Text:
- Date Issued: 2015
- Authors: Van Zyl, Salmon Johannes
- Date: 2015
- Subjects: Pinus radiata -- South Africa , Forest biomass -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4321 , vital:20584
- Description: South Africa lags behind the rest of the world with regard to the availability of allometric biomass information. There is a complete lack of site specific allometric data for Pinus radiata in the southern Cape region, impeding investment in the renewable energy sector. This shortcoming was addressed by developing up-scalable, single tree biomass models. These models quantify the aboveground biomass of rotation age P. radiata grown in the southern Cape across a range of site conditions. The models use diameter at breast height (DBH) to predict the aboveground component biomass. A nutrient loss risk potential was assigned to each biomass component. Nineteen trees were destructively harvested using a full fresh weight sampling approach. Basic density was determined using a water displacement method, while Newton’s volume equation was used for stemwood volume determination. Log linear models were simultaneously regressed through seemingly unrelated regression (SUR) using the “Systemfit” R statistical package to force component additivity. A categorical variable was applied to the models, grouping the data into two Site Index (SI) based categories, namely “Low” SI and “Medium to High” SI, to account for inter-site variability. The corrected Akaike Information Criteria (AICc) and coefficient of determination (R2) was used to determine the goodness of fit of the models. The McElroy R2 for the SUR system was 0.95. Biomass models were developed that are able to predict various tree component masses at high levels of certainty within site and stand attribute ranges similar to this study. The importance of accurate, site specific wood basic density was demonstrated by its substantial weighting on stem and hence total biomass. Results showed that the stemwood mean basic density range was between 503 kg m-3 and 517 kg m-3 for the “Low” SI sites and 458 kg m-3 for the “Medium to High” SI sites. Site quality can have a major impact on the models, particularly on poorer sites where stemwood production is proportionally less than other tree components. Total aboveground biomass was estimated to range between 58.61 odt ha-1 and 70.85 odt ha-1 for “Low” SI sites, and 185.31 odt ha-1 to 266.58 odt ha-1 for “Medium to High” SI sites. Stemwood biomass accounted for 65% of the total aboveground biomass for “Low” SI sites and 70% for “Medium to High” SI sites.
- Full Text:
- Date Issued: 2015
Cape mountain zebra (Equus zebra zebra) habitat use and diet in the Bontebok National Park, South Africa
- Authors: Strauss, Taniia
- Date: 2015
- Subjects: Habitat conservation -- South Africa -- Western Cape Zebras -- Habitat -- Conservation -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/11374 , vital:26917
- Description: Cape mountain zebra habitat utilization and diet in the dystrophic fynbos habitat of the Bontebok National Park was found to be highly selective. Mountain zebra concentrated in specific sectors and habitat types in the park on a seasonal basis, preferring recently burnt habitat with a veld age younger than one year in all seasons, except during the warm, dry summer. Proteoid Fynbos with a veld age between one and five years was preferred in the cool winter, while Drainage Lines and the fringes of Inland Pans were preferred during summer. Asteraceous Fynbos was avoided, irrespective of veld age, as well as all other habitats with a veld age greater than five years. Within habitat types with a veld age greater than one year, specific sites were selected and avoided on a seasonal basis, which were found to differ in terms of habitat suitability, based on the availability of dietary plant species. The annual diet consisted of 72.6% grass, 11.8% restio, 5.9% sedge, 8.8% geophyte and less than 1% forb and shrub species. Three grass species formed the bulk of the annual diet, Themeda triandra, Cymbopogon marginatus and Eragrostis curvula, for which leaf use was greater than stem use. Themeda trianda was preferred throughout the year, but contributed to the diet in greatest proportion in the warm, dry summer, when it was available at greatest leaf height and diameter. Cymbopogon marginatus was preferred during the cool winter, when diet composition and greenness was also greater than in other seasons. Preference of Cymbopogon marginatus decreased as leaf height and diameter increased. Eragrostis curvula was preferred in the warm autumn, when it composed the largest proportion of the diet, and selection of this species at feeding sites was based on both greenness and volume. In summer mountain zebra also preferred grass stems and inflorescences of Aristida diffusa, Stipagrostis zeyheri and Briza maxima. During the cool spring the diet included stems and inflorescences of sedges and restios, primarily Ischyrolepis capensis, and in autumn, dry bulbs of the geophyte Moraea collina were utilized. Habitat utilization, as well as grass height and greenness surveys in the Recently Burnt Area, and the nutritional status of mountain zebra was found to be in line with the Summer Nutritional Stress Hypothesis. The hypothesis proposes that the harsh climatic conditions of the area during summer are linked to the low availability of C4 grass, on which grazers would depend in summer. This is supported by the avoidance of the Recently Burnt Area in summer, and the preference of species like Themeda triandra during summer despite low greenness levels. Faecal nitrogen and phosphorus for mountain zebra in Bontebok National Park and De Hoop Nature Reserve were at minimum levels during the warm seasons. Faecal nitrogen was below the threshold for dietary deficiency in all seasons except spring, and faecal phosphorus was above the threshold for deficiency during two seasons only. The findings of this study are in line with other recent work on mountain zebra in the Baviaanskloof suggesting that, due to a high required rate of forage intake, mountain zebra are limited by both poor resource quantity and quality in dystrophic fynbos ecosystems.
- Full Text:
- Date Issued: 2015
- Authors: Strauss, Taniia
- Date: 2015
- Subjects: Habitat conservation -- South Africa -- Western Cape Zebras -- Habitat -- Conservation -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/11374 , vital:26917
- Description: Cape mountain zebra habitat utilization and diet in the dystrophic fynbos habitat of the Bontebok National Park was found to be highly selective. Mountain zebra concentrated in specific sectors and habitat types in the park on a seasonal basis, preferring recently burnt habitat with a veld age younger than one year in all seasons, except during the warm, dry summer. Proteoid Fynbos with a veld age between one and five years was preferred in the cool winter, while Drainage Lines and the fringes of Inland Pans were preferred during summer. Asteraceous Fynbos was avoided, irrespective of veld age, as well as all other habitats with a veld age greater than five years. Within habitat types with a veld age greater than one year, specific sites were selected and avoided on a seasonal basis, which were found to differ in terms of habitat suitability, based on the availability of dietary plant species. The annual diet consisted of 72.6% grass, 11.8% restio, 5.9% sedge, 8.8% geophyte and less than 1% forb and shrub species. Three grass species formed the bulk of the annual diet, Themeda triandra, Cymbopogon marginatus and Eragrostis curvula, for which leaf use was greater than stem use. Themeda trianda was preferred throughout the year, but contributed to the diet in greatest proportion in the warm, dry summer, when it was available at greatest leaf height and diameter. Cymbopogon marginatus was preferred during the cool winter, when diet composition and greenness was also greater than in other seasons. Preference of Cymbopogon marginatus decreased as leaf height and diameter increased. Eragrostis curvula was preferred in the warm autumn, when it composed the largest proportion of the diet, and selection of this species at feeding sites was based on both greenness and volume. In summer mountain zebra also preferred grass stems and inflorescences of Aristida diffusa, Stipagrostis zeyheri and Briza maxima. During the cool spring the diet included stems and inflorescences of sedges and restios, primarily Ischyrolepis capensis, and in autumn, dry bulbs of the geophyte Moraea collina were utilized. Habitat utilization, as well as grass height and greenness surveys in the Recently Burnt Area, and the nutritional status of mountain zebra was found to be in line with the Summer Nutritional Stress Hypothesis. The hypothesis proposes that the harsh climatic conditions of the area during summer are linked to the low availability of C4 grass, on which grazers would depend in summer. This is supported by the avoidance of the Recently Burnt Area in summer, and the preference of species like Themeda triandra during summer despite low greenness levels. Faecal nitrogen and phosphorus for mountain zebra in Bontebok National Park and De Hoop Nature Reserve were at minimum levels during the warm seasons. Faecal nitrogen was below the threshold for dietary deficiency in all seasons except spring, and faecal phosphorus was above the threshold for deficiency during two seasons only. The findings of this study are in line with other recent work on mountain zebra in the Baviaanskloof suggesting that, due to a high required rate of forage intake, mountain zebra are limited by both poor resource quantity and quality in dystrophic fynbos ecosystems.
- Full Text:
- Date Issued: 2015
Data modelling techniques to improve student's admission criteria
- Authors: Hutton, David
- Date: 2015
- Subjects: Database management Database design
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/11036 , vital:26879
- Description: Education is commonly seen as an escape from poverty and a critical path to securing a better standard of living. This is especially relevant in the South African context, where the need is so great that in one instance people were trampled to death at the gates of a higher educational institution, whilst attempting to register for this opportunity. The root cause of this great need is a limited capacity and a demand, which outstrips the supply. This is not a problem specific to South Africa. It is however exaggerated in the South African context due to the country's lack of infrastructure and the opening of facilities to all people. Tertiary educational institutions are faced with ever-increasing applications for a limited number of available positions. This study focuses on a dataset from the Nelson Mandela Metropolitan University's Faculty of Engineering, the Built Environment and Information Technology - with the aim of establishing guidelines for the use of data modelling techniques to improve student admissions criteria. The importance of data preprocessing was highlighted and generalized linear regression, decision trees and neural networks were proposed and motivated for modelling. Experimentation was carried out, resulting in a number of recommended guidelines focusing on the tremendous value of feature engineering coupled with the use of generalized linear regression as a base line. Adding multiple models was highly recommended; since it allows for greater opportunities for added insight.
- Full Text:
- Date Issued: 2015
- Authors: Hutton, David
- Date: 2015
- Subjects: Database management Database design
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/11036 , vital:26879
- Description: Education is commonly seen as an escape from poverty and a critical path to securing a better standard of living. This is especially relevant in the South African context, where the need is so great that in one instance people were trampled to death at the gates of a higher educational institution, whilst attempting to register for this opportunity. The root cause of this great need is a limited capacity and a demand, which outstrips the supply. This is not a problem specific to South Africa. It is however exaggerated in the South African context due to the country's lack of infrastructure and the opening of facilities to all people. Tertiary educational institutions are faced with ever-increasing applications for a limited number of available positions. This study focuses on a dataset from the Nelson Mandela Metropolitan University's Faculty of Engineering, the Built Environment and Information Technology - with the aim of establishing guidelines for the use of data modelling techniques to improve student admissions criteria. The importance of data preprocessing was highlighted and generalized linear regression, decision trees and neural networks were proposed and motivated for modelling. Experimentation was carried out, resulting in a number of recommended guidelines focusing on the tremendous value of feature engineering coupled with the use of generalized linear regression as a base line. Adding multiple models was highly recommended; since it allows for greater opportunities for added insight.
- Full Text:
- Date Issued: 2015
Demand driven rural agricultural development in South Africa: the case of the agricultural sustainable community investment programme
- Authors: Troosters, Wim
- Date: 2015
- Subjects: Agricultural development projects -- South Africa , Farms, Small -- South Africa , Farmers -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10739 , http://hdl.handle.net/10948/d1021149
- Description: Food security is high on the development agenda in South Africa. A wide range of agricultural interventions exist across the country initiated by various stakeholders at different levels of society. While many interventions focus on production related constraints of food security, there are far fewer that focus on the integration of smallholder farmers in the supply chain. The research subject is the Agricultural Sustainable Community Investment Project (Agri-SCIP), operating on the south coast of the Kwa-Zulu Natal Province. As a demand driven alternative market model, the focus of the project is on the integration of local smallholder farmers in the fresh produce supply chain. The main research question is whether the participation of smallholder farmers in the fresh produce supply actually has actually improved for participants of the test case. Existing barriers to entry for smallholder farmers are mitigated in the project. Through a literature review five critical factors for market participation by smallholder farmers are identified, namely transport and distance to markets, product quality, product quantity, the buyer-seller relationship and market information. A literature review and empirical data are applied to test the impact of the Agri-SCIP project on the participation of smallholder farmers in the fresh produce supply chain based on these five critical factors. The data indicate that many of the existing barriers to entry in the fresh produce supply chain for the smallholder farmers are mitigated, and have been shifted to a collectively owned co-operative. Therefore, as an alternative market model, Agri-SCIP has the potential to provide a sustainable solution for smallholder development in South Africa with a strong focus on supply chain participation. The development of a strong smallholder farmers base and the development of smallholder farmers into semi-commercial farmers are potential long term results of the Agri-SCIP alternative market model.
- Full Text:
- Date Issued: 2015
- Authors: Troosters, Wim
- Date: 2015
- Subjects: Agricultural development projects -- South Africa , Farms, Small -- South Africa , Farmers -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10739 , http://hdl.handle.net/10948/d1021149
- Description: Food security is high on the development agenda in South Africa. A wide range of agricultural interventions exist across the country initiated by various stakeholders at different levels of society. While many interventions focus on production related constraints of food security, there are far fewer that focus on the integration of smallholder farmers in the supply chain. The research subject is the Agricultural Sustainable Community Investment Project (Agri-SCIP), operating on the south coast of the Kwa-Zulu Natal Province. As a demand driven alternative market model, the focus of the project is on the integration of local smallholder farmers in the fresh produce supply chain. The main research question is whether the participation of smallholder farmers in the fresh produce supply actually has actually improved for participants of the test case. Existing barriers to entry for smallholder farmers are mitigated in the project. Through a literature review five critical factors for market participation by smallholder farmers are identified, namely transport and distance to markets, product quality, product quantity, the buyer-seller relationship and market information. A literature review and empirical data are applied to test the impact of the Agri-SCIP project on the participation of smallholder farmers in the fresh produce supply chain based on these five critical factors. The data indicate that many of the existing barriers to entry in the fresh produce supply chain for the smallholder farmers are mitigated, and have been shifted to a collectively owned co-operative. Therefore, as an alternative market model, Agri-SCIP has the potential to provide a sustainable solution for smallholder development in South Africa with a strong focus on supply chain participation. The development of a strong smallholder farmers base and the development of smallholder farmers into semi-commercial farmers are potential long term results of the Agri-SCIP alternative market model.
- Full Text:
- Date Issued: 2015
Design and development of a multi-axis controlled thermal scanner
- Authors: Ikho, Bambiso
- Date: 2015
- Subjects: Temperature measurements Heat -- Transmission -- Measurement , Heat -- Transmission
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/50066 , vital:41998
- Description: Surface temperature measurement is applicable to a vast number of fields including manufacturing, processing, agricultural, medical and pharmaceutical fields just to name a few. Two methods for obtaining surface temperature measurements exist; ‘surface contact measurement’ in which the measuring device makes physical contact with the surface in question or alternatively, ‘non-contact surface measurement’ where there is no contact at all. Both of these methods have got advantages, as well as disadvantages. However, in recent times, non-contact methods have been preferred since they are non-intrusive and allow for remote measurements to be made. In this research, a non-contact mobile temperature measurement system is developed. The system is microcontroller-based and uses infrared sensors to acquire temperature measurements. The infrared sensors are mounted on a three-axes, x-y-z coordinate system which allows a thermal profile of a particular surface to be generated and displayed on a Graphical User Interface (GUI) in real-time. Various tests were carried out to compare contact and non-contact measurement methods; to determine the most suitable operating height for accurate non-contact measurement given a specific surface and to investigate the benefit of single and/ or multiple sensor arrangements. The research showed that a non-contact thermal scanning system could be used to obtain detailed yet accurate surface temperature measurements following an initial sensor calibration phase to determine the most favourable scanning parameters for a particular surface. The measurements taken could then be used to generate a thermal map of a surface with a significant improvement in resolution as compared with measurements taken using contact devices. The research further showed that a multiple sensor arrangement significantly reduced the time taken to generate the thermal profiles without undermining accuracy.
- Full Text:
- Date Issued: 2015
- Authors: Ikho, Bambiso
- Date: 2015
- Subjects: Temperature measurements Heat -- Transmission -- Measurement , Heat -- Transmission
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/50066 , vital:41998
- Description: Surface temperature measurement is applicable to a vast number of fields including manufacturing, processing, agricultural, medical and pharmaceutical fields just to name a few. Two methods for obtaining surface temperature measurements exist; ‘surface contact measurement’ in which the measuring device makes physical contact with the surface in question or alternatively, ‘non-contact surface measurement’ where there is no contact at all. Both of these methods have got advantages, as well as disadvantages. However, in recent times, non-contact methods have been preferred since they are non-intrusive and allow for remote measurements to be made. In this research, a non-contact mobile temperature measurement system is developed. The system is microcontroller-based and uses infrared sensors to acquire temperature measurements. The infrared sensors are mounted on a three-axes, x-y-z coordinate system which allows a thermal profile of a particular surface to be generated and displayed on a Graphical User Interface (GUI) in real-time. Various tests were carried out to compare contact and non-contact measurement methods; to determine the most suitable operating height for accurate non-contact measurement given a specific surface and to investigate the benefit of single and/ or multiple sensor arrangements. The research showed that a non-contact thermal scanning system could be used to obtain detailed yet accurate surface temperature measurements following an initial sensor calibration phase to determine the most favourable scanning parameters for a particular surface. The measurements taken could then be used to generate a thermal map of a surface with a significant improvement in resolution as compared with measurements taken using contact devices. The research further showed that a multiple sensor arrangement significantly reduced the time taken to generate the thermal profiles without undermining accuracy.
- Full Text:
- Date Issued: 2015
Development role players' knowledge of ecological infrastructure in Eden district, South Africa
- Authors: Crisp, Abigail Gilmour
- Date: 2015
- Subjects: Climatic changes -- South Africa , Environmental management , Coastal engineering
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/8725 , vital:26424
- Description: Coastal disasters have been increasing in intensity and frequency around the world causing loss of life and millions of Rands’ worth of damage to infrastructure. Coastal communities are growing as more people are drawn to urban areas. These people depend on the services the coastal ecosystem provide but through degradation and land use change the supply of services is reduced. The ability of these communities and landscapes to bounce back from disturbance has been severely hampered. As a result communities are looking for ways in which they can protect their lives and their assets and become more resilient. Through development planning structures such as coastal foredunes, that offer a buffering capacity against storm surges, can be used to strengthen the resilience of coastal communities. The type of defences used in communities would be dependent on the knowledge of the decision makers. This study explores the discourses and practices that are present in development processes regarding ecological infrastructure (in its buffering capacity for risk reduction) as an option for adaptation to global environmental change in the coastal areas of Eden District. Qualitative data collection and analysis techniques were used. In-depth interviews were used to collect data, which was transformed into frequency data using content analysis. Descriptive statistics was then applied to the coded frequencies. The interpretation of the data was presented alongside the frequency data, via the descriptive statistics and quotations from interviews. It was determined that role players in development processes are aware of the complexities surrounding coastal social-ecological systems and understand the role foredunes play as ecological infrastructure within this system. Those who lack knowledge are aware of their knowledge gaps. Participants believe the study area is at risk due to human impacts and overall, participants felt that there is a general lack of awareness with regard to issues affecting our coastline, compounded by the absence of an enabling environment brought about by a lack of finances and time.
- Full Text:
- Date Issued: 2015
- Authors: Crisp, Abigail Gilmour
- Date: 2015
- Subjects: Climatic changes -- South Africa , Environmental management , Coastal engineering
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/8725 , vital:26424
- Description: Coastal disasters have been increasing in intensity and frequency around the world causing loss of life and millions of Rands’ worth of damage to infrastructure. Coastal communities are growing as more people are drawn to urban areas. These people depend on the services the coastal ecosystem provide but through degradation and land use change the supply of services is reduced. The ability of these communities and landscapes to bounce back from disturbance has been severely hampered. As a result communities are looking for ways in which they can protect their lives and their assets and become more resilient. Through development planning structures such as coastal foredunes, that offer a buffering capacity against storm surges, can be used to strengthen the resilience of coastal communities. The type of defences used in communities would be dependent on the knowledge of the decision makers. This study explores the discourses and practices that are present in development processes regarding ecological infrastructure (in its buffering capacity for risk reduction) as an option for adaptation to global environmental change in the coastal areas of Eden District. Qualitative data collection and analysis techniques were used. In-depth interviews were used to collect data, which was transformed into frequency data using content analysis. Descriptive statistics was then applied to the coded frequencies. The interpretation of the data was presented alongside the frequency data, via the descriptive statistics and quotations from interviews. It was determined that role players in development processes are aware of the complexities surrounding coastal social-ecological systems and understand the role foredunes play as ecological infrastructure within this system. Those who lack knowledge are aware of their knowledge gaps. Participants believe the study area is at risk due to human impacts and overall, participants felt that there is a general lack of awareness with regard to issues affecting our coastline, compounded by the absence of an enabling environment brought about by a lack of finances and time.
- Full Text:
- Date Issued: 2015
Dispersal of sterile false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), for a sterile insect technique programme on citrus
- Authors: Wagenaar, Gideon Daniel
- Date: 2015
- Subjects: Cryptophlebia leucotreta , Insect pests -- Control -- South Africa , Citrus -- Diseases and pests -- Control -- South Africa , Insect sterilization
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4977 , vital:20774
- Description: The false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), is an important pest of citrus in South Africa and challenging to manage due to its inconspicuous nature. An effective method currently being employed for the area-wide suppression of the FCM is the Sterile Insect Technique (SIT) and the effective dispersal of sterile moths is very important for success with SIT. This study was conducted in the Addo area of the Sundays River Valley (Eastern Cape) where the programme is commercially used. In this study, sterile male moths were released in different orchards on a citrus farm, and in nearby veld at different times of the year, and their dispersal was monitored through the use of pheromone traps. Various climatic factors were monitored. This provided insight into the local dispersal of sterile male FCM adults in response to abiotic cues (particularly climatic factors). The movement of the FCM in four citrus cultivars, namely lemons, navel and Valencia oranges and mandarins and in the nearby veld (open field), was determined at six different stages of the year. Results clearly indicated that sterile FCM movement is concentrated within citrus orchards, as very few moths were trapped beyond 30 m from the release point, particularly in navel and Valencia orchards. Of the climatic factors measured, minimum and maximum temperatures had the most significant influence on FCM dispersal, and based on the results, various recommendations are made for the releases of sterile FCM in an area-wide SIT management programmes on citrus. A better understanding of the dispersal capabilities of the FCM in an agricultural system, under different conditions and at different times of the year, is invaluable not only in improving release strategies in an SIT programme but in planning future control strategies against the FCM.
- Full Text:
- Date Issued: 2015
- Authors: Wagenaar, Gideon Daniel
- Date: 2015
- Subjects: Cryptophlebia leucotreta , Insect pests -- Control -- South Africa , Citrus -- Diseases and pests -- Control -- South Africa , Insect sterilization
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4977 , vital:20774
- Description: The false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), is an important pest of citrus in South Africa and challenging to manage due to its inconspicuous nature. An effective method currently being employed for the area-wide suppression of the FCM is the Sterile Insect Technique (SIT) and the effective dispersal of sterile moths is very important for success with SIT. This study was conducted in the Addo area of the Sundays River Valley (Eastern Cape) where the programme is commercially used. In this study, sterile male moths were released in different orchards on a citrus farm, and in nearby veld at different times of the year, and their dispersal was monitored through the use of pheromone traps. Various climatic factors were monitored. This provided insight into the local dispersal of sterile male FCM adults in response to abiotic cues (particularly climatic factors). The movement of the FCM in four citrus cultivars, namely lemons, navel and Valencia oranges and mandarins and in the nearby veld (open field), was determined at six different stages of the year. Results clearly indicated that sterile FCM movement is concentrated within citrus orchards, as very few moths were trapped beyond 30 m from the release point, particularly in navel and Valencia orchards. Of the climatic factors measured, minimum and maximum temperatures had the most significant influence on FCM dispersal, and based on the results, various recommendations are made for the releases of sterile FCM in an area-wide SIT management programmes on citrus. A better understanding of the dispersal capabilities of the FCM in an agricultural system, under different conditions and at different times of the year, is invaluable not only in improving release strategies in an SIT programme but in planning future control strategies against the FCM.
- Full Text:
- Date Issued: 2015
Friction hydro pillar riveting process of Ti-6AI-4V titanium sheet
- Authors: Tsikayi, Davies Shamiso
- Date: 2015
- Subjects: Friction welding , Titanium alloys -- Welding , Sheet-metal
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/6357 , vital:21078
- Description: Mechanical fasteners are used extensively in the joining of two or more metal plates or sheets. Riveted joints have been the joints of choice mainly for the Aerospace Industry. However for this research, Friction Hydro Pillar Processing has been used to develop and characterise a new riveting technique termed Friction Hydro Pillar Riveting (FHPR). Two overlapping 3.17 mm Ti-6Al-4V sheets were joined together using Ø6 mm rivet which was friction processed. This research has focussed on the initial development of Friction Hydro Pillar Riveting thereby establishing a basic understanding of the influences of main process parameters, rotational speed and axial force - and also joint configurations. The results showed that with a decrease in the bottom hole chamfer angle, there was resulting overall increase in the rivet joint pull off strength. From the best performing joint configuration in pull off tests, shear tests were conducted whilst a blind hole FHPR joint was also done and tested in pull off and shear strength. The shear test fracture surfaces exhibited ductile failure. The microstructure of the joints was thus evaluated. From parent material, heat affected zone and to weld zone there was a variation in the microstructure analysed. The hardness profiles showed increased hardness in the weld zone which partly explained the shear results. The hardness increase was mainly due to grain refinement in the weld zone by the Friction Hydro Pillar Riveting process.
- Full Text:
- Date Issued: 2015
- Authors: Tsikayi, Davies Shamiso
- Date: 2015
- Subjects: Friction welding , Titanium alloys -- Welding , Sheet-metal
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/6357 , vital:21078
- Description: Mechanical fasteners are used extensively in the joining of two or more metal plates or sheets. Riveted joints have been the joints of choice mainly for the Aerospace Industry. However for this research, Friction Hydro Pillar Processing has been used to develop and characterise a new riveting technique termed Friction Hydro Pillar Riveting (FHPR). Two overlapping 3.17 mm Ti-6Al-4V sheets were joined together using Ø6 mm rivet which was friction processed. This research has focussed on the initial development of Friction Hydro Pillar Riveting thereby establishing a basic understanding of the influences of main process parameters, rotational speed and axial force - and also joint configurations. The results showed that with a decrease in the bottom hole chamfer angle, there was resulting overall increase in the rivet joint pull off strength. From the best performing joint configuration in pull off tests, shear tests were conducted whilst a blind hole FHPR joint was also done and tested in pull off and shear strength. The shear test fracture surfaces exhibited ductile failure. The microstructure of the joints was thus evaluated. From parent material, heat affected zone and to weld zone there was a variation in the microstructure analysed. The hardness profiles showed increased hardness in the weld zone which partly explained the shear results. The hardness increase was mainly due to grain refinement in the weld zone by the Friction Hydro Pillar Riveting process.
- Full Text:
- Date Issued: 2015
Guidelines for the analysis of student web usage in support of primary educational objectives
- Authors: Von Schoultz, Dean John
- Date: 2015
- Subjects: Information behavior , Searching behavior , Internet in higher education , World Wide Web , Educational technology
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4965 , vital:20772
- Description: The Internet and World Wide Web provides huge amounts of information to individuals with access to it. Information is an important driving factor of education and higher education has experienced massive adoption rates of information and communication technologies, and accessing the Web is not an uncommon practice within a higher educational institution. The Web provides numerous benefits and many students rely on the Web for information, communication and technical support. However, the immense amount of information available on the Web has brought about some negative side effects associated with abundant information. Whether the Web is a positive influence on students’ academic well-being within higher education is a difficult question to answer. To understand how the Web is used by students within a higher education institution is not an easy task. However, there are ways to understand the Web usage behaviour of students. Using established methods for gathering useful information from data produced by an institution, Web usage behaviours of students within a higher education institution could be analysed and presented. This dissertation presents guidance for analysing Web traffic within a higher educational institution in order to gain insight into the Web usage behaviours of students. This insight can provide educators with valuable information to bolster their decision-making capacity towards achieving their educational goals.
- Full Text:
- Date Issued: 2015
- Authors: Von Schoultz, Dean John
- Date: 2015
- Subjects: Information behavior , Searching behavior , Internet in higher education , World Wide Web , Educational technology
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4965 , vital:20772
- Description: The Internet and World Wide Web provides huge amounts of information to individuals with access to it. Information is an important driving factor of education and higher education has experienced massive adoption rates of information and communication technologies, and accessing the Web is not an uncommon practice within a higher educational institution. The Web provides numerous benefits and many students rely on the Web for information, communication and technical support. However, the immense amount of information available on the Web has brought about some negative side effects associated with abundant information. Whether the Web is a positive influence on students’ academic well-being within higher education is a difficult question to answer. To understand how the Web is used by students within a higher education institution is not an easy task. However, there are ways to understand the Web usage behaviour of students. Using established methods for gathering useful information from data produced by an institution, Web usage behaviours of students within a higher education institution could be analysed and presented. This dissertation presents guidance for analysing Web traffic within a higher educational institution in order to gain insight into the Web usage behaviours of students. This insight can provide educators with valuable information to bolster their decision-making capacity towards achieving their educational goals.
- Full Text:
- Date Issued: 2015
Histopathology induced by a medicinal plant indigenous to South Africa that has shown in vitro anti-microbial activity against drug resistant strains of Mycobacterium tuberculosis
- Authors: Shauli, Mathulo Mathabiso
- Date: 2015
- Subjects: Mycobacterial diseases , Tuberculosis -- Treatment -- South Africa , Medicinal plants -- Microbiology , Traditional medicine
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/3990 , vital:20498
- Description: Tuberculosis (TB) still remains a health problem globally with over a million new infections and a mortality rate of 1.5 million individuals annually (Hawn et al., 2014). The emerging multi-drug resistant (MDR) strains that accompany human immune deficiency virus (HIV) infection in high-incidence populations contribute significantly to the health burden of TB (Areeshi et al., 2014). The standard treatment that is advocated by the World Health Organization (WHO) for active tuberculosis includes long-term therapy that incorporates the use of isoniazid, rifampicin, pyrazinimide and ethambutol as front line drugs (WHO, 2013). Drug resistance against established treatment options for TB makes research into new forms of therapy an imperative in health care (Ntulela et al., 2009). South Africa is currently witnessing a high number of cases of drug-resistant TB. In some parts of the country, one in ten cases of TB is resistant to treatment. It is therefore essential to have new anti-tuberculosis agents, which can be readily and simply produced from some local source (Warner et al., 2014). A logical starting point for this research of new agents would be the herbal medicines which have been used for centuries in rural areas by local healers. Western developed countries have harvested ethno botanical knowledge and have produced drug therapies for conventional medicines for other ailments. The activity of extracts of the active plants and their properties still require study in animal models in order to assess their future as new anti-tuberculosis agents (Lall and Meyer, 1999). This study focuses on qualitative and quantitative experimental findings after the administration of a medicinal plant extract to animals. This will include daily observation of animals, recording of feed consumption, recording of animal weights, macroscopic examination of animals at necropsy, tissue harvesting, histological procedures and microscopy.
- Full Text:
- Date Issued: 2015
- Authors: Shauli, Mathulo Mathabiso
- Date: 2015
- Subjects: Mycobacterial diseases , Tuberculosis -- Treatment -- South Africa , Medicinal plants -- Microbiology , Traditional medicine
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/3990 , vital:20498
- Description: Tuberculosis (TB) still remains a health problem globally with over a million new infections and a mortality rate of 1.5 million individuals annually (Hawn et al., 2014). The emerging multi-drug resistant (MDR) strains that accompany human immune deficiency virus (HIV) infection in high-incidence populations contribute significantly to the health burden of TB (Areeshi et al., 2014). The standard treatment that is advocated by the World Health Organization (WHO) for active tuberculosis includes long-term therapy that incorporates the use of isoniazid, rifampicin, pyrazinimide and ethambutol as front line drugs (WHO, 2013). Drug resistance against established treatment options for TB makes research into new forms of therapy an imperative in health care (Ntulela et al., 2009). South Africa is currently witnessing a high number of cases of drug-resistant TB. In some parts of the country, one in ten cases of TB is resistant to treatment. It is therefore essential to have new anti-tuberculosis agents, which can be readily and simply produced from some local source (Warner et al., 2014). A logical starting point for this research of new agents would be the herbal medicines which have been used for centuries in rural areas by local healers. Western developed countries have harvested ethno botanical knowledge and have produced drug therapies for conventional medicines for other ailments. The activity of extracts of the active plants and their properties still require study in animal models in order to assess their future as new anti-tuberculosis agents (Lall and Meyer, 1999). This study focuses on qualitative and quantitative experimental findings after the administration of a medicinal plant extract to animals. This will include daily observation of animals, recording of feed consumption, recording of animal weights, macroscopic examination of animals at necropsy, tissue harvesting, histological procedures and microscopy.
- Full Text:
- Date Issued: 2015
Hydrothermal co-liquefaction of microalgae biomass and coal
- Authors: Charlie, David
- Date: 2015
- Subjects: Microalgae -- Biotechnology Biomass chemicals , Biomass energy
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/50087 , vital:42035
- Description: In this research, the objective was to investigate under the chosen liquefaction conditions whether co-liquefaction of coal and microalgae biomass as agglomerates does possess a distinct advantage over the individual liquefaction of microalgae and coal. This was initially done by preparing dry micro algal biomass, followed by the preparation of coal fines and finally coal-algae as agglomerates. The agglomerates were prepared by continuously adsorbing wet concentrated microalgae slurry/solution onto the dry coal fines in order to prepare different ratios of coal-algae agglomerate(s). Ultimate analysis of the starting material (coal fines and the microalgae) as well the agglomerates then followed. According to research, wet microalgae biomass has the potential of acting as a hydrogen donor. By preparing the agglomerates, the rationale was to promote hydrogen supply from the micro algal biomass that has high hydrogen content to the coal with lower hydrogen content. The resulting product was then expected to have fairly higher hydrogen content. However, this was not observed or evident from the elemental analysis results. The results (elemental composition) showed no difference between the agglomerates and the coal. Based on the observed ultimate analysis results, liquefaction experiments were conducted to determine whether hydrogen transfer and the expected synergistic effect between micro algal biomass and coal would occur. The crude oil product was recovered and simulated distillation technique was used for the characterization of the crude oil product. The results we in agreement that higher yields can be achieved during co-liquefaction as compared to the individual liquefaction. A possible synergistic effect that was investigated in this research existed. Liquefaction results provided evidence of higher yields recovery from the agglomerates compared to those of coal fines and microalgae biomass. Although there was higher recovery on the agglomerates, there appears to be a downward trend (decrease) in product recovery with higher loadings of micro algal biomass on to the coal. This means that higher loading of micro algal biomass tend to suppress liquefaction of coal, thus resulting in lower product recovery. While lower loadings tend to effectively facilitate the liquefaction of coal, thus proving that the proposed synergistic effect between the two does exist. Overall product recovery (yields) of the agglomerates is higher compared to the individual recovery of coal fines and microalgae biomass. This was followed by mass balancing to determine the overall conversion. Higher conversions were achieved on the agglomerates compared to coal. This could mean that microalgae have the potential to facilitate the liquefaction of coal and improve its conversion. The observed trend results in improved conversion as well as higher oil yields (simulated distillation results). Overall, the mass balancing provided insightful information regarding the coal-microalgae interaction based on the conversion, and this further corresponds or supports the simulated distillation results. This research paper provides evidence of the synergistic effect that exists between micro algal biomass and coal.
- Full Text:
- Date Issued: 2015
- Authors: Charlie, David
- Date: 2015
- Subjects: Microalgae -- Biotechnology Biomass chemicals , Biomass energy
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/50087 , vital:42035
- Description: In this research, the objective was to investigate under the chosen liquefaction conditions whether co-liquefaction of coal and microalgae biomass as agglomerates does possess a distinct advantage over the individual liquefaction of microalgae and coal. This was initially done by preparing dry micro algal biomass, followed by the preparation of coal fines and finally coal-algae as agglomerates. The agglomerates were prepared by continuously adsorbing wet concentrated microalgae slurry/solution onto the dry coal fines in order to prepare different ratios of coal-algae agglomerate(s). Ultimate analysis of the starting material (coal fines and the microalgae) as well the agglomerates then followed. According to research, wet microalgae biomass has the potential of acting as a hydrogen donor. By preparing the agglomerates, the rationale was to promote hydrogen supply from the micro algal biomass that has high hydrogen content to the coal with lower hydrogen content. The resulting product was then expected to have fairly higher hydrogen content. However, this was not observed or evident from the elemental analysis results. The results (elemental composition) showed no difference between the agglomerates and the coal. Based on the observed ultimate analysis results, liquefaction experiments were conducted to determine whether hydrogen transfer and the expected synergistic effect between micro algal biomass and coal would occur. The crude oil product was recovered and simulated distillation technique was used for the characterization of the crude oil product. The results we in agreement that higher yields can be achieved during co-liquefaction as compared to the individual liquefaction. A possible synergistic effect that was investigated in this research existed. Liquefaction results provided evidence of higher yields recovery from the agglomerates compared to those of coal fines and microalgae biomass. Although there was higher recovery on the agglomerates, there appears to be a downward trend (decrease) in product recovery with higher loadings of micro algal biomass on to the coal. This means that higher loading of micro algal biomass tend to suppress liquefaction of coal, thus resulting in lower product recovery. While lower loadings tend to effectively facilitate the liquefaction of coal, thus proving that the proposed synergistic effect between the two does exist. Overall product recovery (yields) of the agglomerates is higher compared to the individual recovery of coal fines and microalgae biomass. This was followed by mass balancing to determine the overall conversion. Higher conversions were achieved on the agglomerates compared to coal. This could mean that microalgae have the potential to facilitate the liquefaction of coal and improve its conversion. The observed trend results in improved conversion as well as higher oil yields (simulated distillation results). Overall, the mass balancing provided insightful information regarding the coal-microalgae interaction based on the conversion, and this further corresponds or supports the simulated distillation results. This research paper provides evidence of the synergistic effect that exists between micro algal biomass and coal.
- Full Text:
- Date Issued: 2015
Investigating the use of social networking via mobile phone as an extension tool in small-scale (emerging) agriculture in selected farming communities in the Cacadu District
- Authors: Atinuke, Jimoh Rashidat
- Date: 2015
- Subjects: Farms, Small -- Technological innovations -- South Africa -- Eastern Cape Communication in economic development -- South Africa -- Eastern Cape , Information technology -- Social aspects -- South Africa -- Eastern Cape Digital media -- South Africa -- Eastern Cape Social media -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/18398 , vital:28633
- Description: We live in the era in which the internet is now available on the majority of mobile phones at a very cheaper rate. This advancement in technology has created a boom in the use of mobile phone social networking as a primary communication tool - not only for individuals but also commonly used by professionals in most fields. The trends and growing usage of social networking via mobile phone indicate a potentially effective new platform for increasing production especially in agricultural sectors. In this age of information technology, farming communities can be empowered with the latest information and knowledge through mobile phone social networking to enhance agricultural development. The study investigates the use of mobile phone social networking as an extension tool in small-scale (emerging) farmers in selected farming communities in the Cacadu District Municipality of the Eastern Cape of South Africa. Specifically, the study investigates the use of available mobile phone social networks; what they are used for; and the importance and benefits of social networking both generally and to the farming communities. The study further identifies problems inhibiting the use of mobile phone social networking. Other channels through which the small-scale (emerging) farmers acquire agricultural information, aside from via mobile phone, and the type of agricultural information these farmers acquire, are also investigated. This study focuses on the use - and not the testing or adoption of - mobile phone social networking in small-scale (emerging) agriculture. In the exercise to investigate the use of social networking apps via mobile phone, data was collected from 40 small-scale (emerging) farmers using a purposive sampling method. This study used a survey design, exploratory and descriptive research methodologies. Data was captured by administering a questionnaire through personal face-to-face interviews. Descriptive statistics such as simple frequency tables, percentages and bar graphs were used. From the Chi-square testing, it was found that agricultural knowledge levels, internet access and size of production farm land influence the use of social networking by the small-scale (emerging) farmers. However, the result of this study showed that gender, age, other income and educational level of the small-scale (emerging) farmers are not statistically significant determinants of social networking use. Cronbach’s alpha coefficient was found to be 0.95. To establish the strength of associations of the variables, Cramer’s V ranging between 0.04 and 0.9 (signifying relationships from negligible to very strong association) was used. The findings showed that different social networks are used by the farming communities, such as WhatsApp, Facebook, and Blackberry messenger, MXit, Twitter and YouTube. The various uses of these social networks by the farmers are discussed. The benefits and problems inhibiting their use are also outlined. Other sources of acquiring agricultural information by the farmers aside from social networking via mobile phone are examined. The result of the study shows that [agricultural extension officers, other farmers, farmers’ discussion groups, friends and family,] are major sources of agricultural information to the small-scale (emerging) farmers while other sources are television, radio, print media and result demonstrations. The study suggests that to enhance mobile phone social networking to ensure that timely and effective agricultural information is readily accessible to the small-scale (emerging) farmers. These include agricultural extension officers making optimal use of social networking via mobile phone, due to the strong interaction and trust between them and the farmers. This interaction can be instrumental in the effective use of this technology as a resourceful medium for accessing agricultural information to enhance productivity. Proper awareness and understanding of the potential and benefits of mobile social networking by the farmers will motivate the small-scale (emerging) farmers to use the technology for effective agricultural purposes. Also, ensuring the availability of agricultural information to small-scale (emerging) farmers by setting up on-line pages or websites to discuss matters of interest and educate and update farmers on agricultural issues should be encouraged. This may attract the younger generation and the youth to participate fully in agricultural activities - thereby enhancing agricultural development.
- Full Text:
- Date Issued: 2015
- Authors: Atinuke, Jimoh Rashidat
- Date: 2015
- Subjects: Farms, Small -- Technological innovations -- South Africa -- Eastern Cape Communication in economic development -- South Africa -- Eastern Cape , Information technology -- Social aspects -- South Africa -- Eastern Cape Digital media -- South Africa -- Eastern Cape Social media -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/18398 , vital:28633
- Description: We live in the era in which the internet is now available on the majority of mobile phones at a very cheaper rate. This advancement in technology has created a boom in the use of mobile phone social networking as a primary communication tool - not only for individuals but also commonly used by professionals in most fields. The trends and growing usage of social networking via mobile phone indicate a potentially effective new platform for increasing production especially in agricultural sectors. In this age of information technology, farming communities can be empowered with the latest information and knowledge through mobile phone social networking to enhance agricultural development. The study investigates the use of mobile phone social networking as an extension tool in small-scale (emerging) farmers in selected farming communities in the Cacadu District Municipality of the Eastern Cape of South Africa. Specifically, the study investigates the use of available mobile phone social networks; what they are used for; and the importance and benefits of social networking both generally and to the farming communities. The study further identifies problems inhibiting the use of mobile phone social networking. Other channels through which the small-scale (emerging) farmers acquire agricultural information, aside from via mobile phone, and the type of agricultural information these farmers acquire, are also investigated. This study focuses on the use - and not the testing or adoption of - mobile phone social networking in small-scale (emerging) agriculture. In the exercise to investigate the use of social networking apps via mobile phone, data was collected from 40 small-scale (emerging) farmers using a purposive sampling method. This study used a survey design, exploratory and descriptive research methodologies. Data was captured by administering a questionnaire through personal face-to-face interviews. Descriptive statistics such as simple frequency tables, percentages and bar graphs were used. From the Chi-square testing, it was found that agricultural knowledge levels, internet access and size of production farm land influence the use of social networking by the small-scale (emerging) farmers. However, the result of this study showed that gender, age, other income and educational level of the small-scale (emerging) farmers are not statistically significant determinants of social networking use. Cronbach’s alpha coefficient was found to be 0.95. To establish the strength of associations of the variables, Cramer’s V ranging between 0.04 and 0.9 (signifying relationships from negligible to very strong association) was used. The findings showed that different social networks are used by the farming communities, such as WhatsApp, Facebook, and Blackberry messenger, MXit, Twitter and YouTube. The various uses of these social networks by the farmers are discussed. The benefits and problems inhibiting their use are also outlined. Other sources of acquiring agricultural information by the farmers aside from social networking via mobile phone are examined. The result of the study shows that [agricultural extension officers, other farmers, farmers’ discussion groups, friends and family,] are major sources of agricultural information to the small-scale (emerging) farmers while other sources are television, radio, print media and result demonstrations. The study suggests that to enhance mobile phone social networking to ensure that timely and effective agricultural information is readily accessible to the small-scale (emerging) farmers. These include agricultural extension officers making optimal use of social networking via mobile phone, due to the strong interaction and trust between them and the farmers. This interaction can be instrumental in the effective use of this technology as a resourceful medium for accessing agricultural information to enhance productivity. Proper awareness and understanding of the potential and benefits of mobile social networking by the farmers will motivate the small-scale (emerging) farmers to use the technology for effective agricultural purposes. Also, ensuring the availability of agricultural information to small-scale (emerging) farmers by setting up on-line pages or websites to discuss matters of interest and educate and update farmers on agricultural issues should be encouraged. This may attract the younger generation and the youth to participate fully in agricultural activities - thereby enhancing agricultural development.
- Full Text:
- Date Issued: 2015
Key factors required by purchasing and supply departments in the automotive manufacturing industry
- Authors: Howell, Jean Karin
- Date: 2015
- Subjects: Business logistics -- Management Manufacturing industries Industrial procurement -- Management
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/10971 , vital:26863
- Description: The main research problem addressed in this study was to determine the key factors required by purchasing and supply departments in the automotive manufacturing industry to be efficient and effective. To achieve this objective, it was necessary to identify five sub-objectives which were, firstly, to determine the extent to which the purchasing and supply departments in the automotive industry believe that certain key factors in pricing, quality and supplier management are required to achieve excellence. Secondly, to identify if the purchasing and supply departments in the automotive industry actually implement the key factors on pricing, quality and supplier management in practice. Thirdly, to determine if there are any additional factors other than these key factors that business firms regard as key factors to be classified as worldclass purchasing and supply departments. Fourthly, to analyse why purchasing and supply departments in the automotive manufacturing industry do not always implement these key factors. Lastly, to identify any other factors that could have a significant negative impact on the performance of purchasing and supply departments. The study commenced with an analysis and review of relevant literature from various text books, journals, publications and internet sources. The literature study covered issues such as price determination, cost management, basic negotiation strategies, managing supplier quality and the supplier base, as well as a general overview of the latest developments in purchasing and supply management in business. The purpose of the literature analysis was to establish a theoretical basis for the design of the questionnaire which was used as a research instrument in this study. A survey was conducted among selected automotive assemblers and their first and second tier manufacturing suppliers in the automotive industry. The main areas of focus in the questionnaire were pricing, quality, and supplier management. As the questions in the questionnaire related to the purchasing and supply department of a business firm, a qualified and experienced buyer in the purchasing and supply department was identified in each firm to complete the questionnaire. The empirical results from the study conducted indicated that the respondents were in strong agreement with the proposed importance of the factors of pricing, quality, and supplier management required to achieve xcellence. However, the respondents also indicated that there were various obstacles which prevented the firms from implementing these key factors. Some of the obstacles mentioned were long lead times, late deliveries from suppliers, too few competitors in the market place, supplier capacity constraints and the sustainability of suppliers. Additional obstacles that the study identified were the high workload of buyers in general, incompetent staff and insufficient manpower that affected the performance of a purchasing and supply department. The buyers were not only performing buying activities, but were also involved in logistics related activities, which increased their workload and negatively affected their performance. Lack of specialised purchasing and supply chain knowledge was identified as another obstacle to achieving excellence. The empirical study highlighted some recommendations to assist purchasing and supply departments in the automotive industry to achieve excellence and become world-class departments. Examples of these recommendations are that suppliers need to be educated on how to understand their costing models and to check their own sustainability; local purchasing and supply departments require training in the purchasing skills such as incoterms, delivery times, minimum and maximum order quantity; as well as the payment terms. Buyers should be trained to become experts in their products and packaging, as well as the manufacturing process of the product they are purchasing The business firm should only employ qualified buyers who have financial and administrative skills, as well as the ability to adapt to change and work in teams. Buyers also need to master the in-house systems and work procedures involved in purchasing a product. The empirical study also identified that the majority of buyers in the automotive manufacturing industry are senior buyers, male in gender and between the ages of 40-49. The implementation of the recommendations based on the study’s empirical findings will assist in improved pricing, quality and supply management in the automotive manufacturing industry.
- Full Text:
- Date Issued: 2015
- Authors: Howell, Jean Karin
- Date: 2015
- Subjects: Business logistics -- Management Manufacturing industries Industrial procurement -- Management
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/10971 , vital:26863
- Description: The main research problem addressed in this study was to determine the key factors required by purchasing and supply departments in the automotive manufacturing industry to be efficient and effective. To achieve this objective, it was necessary to identify five sub-objectives which were, firstly, to determine the extent to which the purchasing and supply departments in the automotive industry believe that certain key factors in pricing, quality and supplier management are required to achieve excellence. Secondly, to identify if the purchasing and supply departments in the automotive industry actually implement the key factors on pricing, quality and supplier management in practice. Thirdly, to determine if there are any additional factors other than these key factors that business firms regard as key factors to be classified as worldclass purchasing and supply departments. Fourthly, to analyse why purchasing and supply departments in the automotive manufacturing industry do not always implement these key factors. Lastly, to identify any other factors that could have a significant negative impact on the performance of purchasing and supply departments. The study commenced with an analysis and review of relevant literature from various text books, journals, publications and internet sources. The literature study covered issues such as price determination, cost management, basic negotiation strategies, managing supplier quality and the supplier base, as well as a general overview of the latest developments in purchasing and supply management in business. The purpose of the literature analysis was to establish a theoretical basis for the design of the questionnaire which was used as a research instrument in this study. A survey was conducted among selected automotive assemblers and their first and second tier manufacturing suppliers in the automotive industry. The main areas of focus in the questionnaire were pricing, quality, and supplier management. As the questions in the questionnaire related to the purchasing and supply department of a business firm, a qualified and experienced buyer in the purchasing and supply department was identified in each firm to complete the questionnaire. The empirical results from the study conducted indicated that the respondents were in strong agreement with the proposed importance of the factors of pricing, quality, and supplier management required to achieve xcellence. However, the respondents also indicated that there were various obstacles which prevented the firms from implementing these key factors. Some of the obstacles mentioned were long lead times, late deliveries from suppliers, too few competitors in the market place, supplier capacity constraints and the sustainability of suppliers. Additional obstacles that the study identified were the high workload of buyers in general, incompetent staff and insufficient manpower that affected the performance of a purchasing and supply department. The buyers were not only performing buying activities, but were also involved in logistics related activities, which increased their workload and negatively affected their performance. Lack of specialised purchasing and supply chain knowledge was identified as another obstacle to achieving excellence. The empirical study highlighted some recommendations to assist purchasing and supply departments in the automotive industry to achieve excellence and become world-class departments. Examples of these recommendations are that suppliers need to be educated on how to understand their costing models and to check their own sustainability; local purchasing and supply departments require training in the purchasing skills such as incoterms, delivery times, minimum and maximum order quantity; as well as the payment terms. Buyers should be trained to become experts in their products and packaging, as well as the manufacturing process of the product they are purchasing The business firm should only employ qualified buyers who have financial and administrative skills, as well as the ability to adapt to change and work in teams. Buyers also need to master the in-house systems and work procedures involved in purchasing a product. The empirical study also identified that the majority of buyers in the automotive manufacturing industry are senior buyers, male in gender and between the ages of 40-49. The implementation of the recommendations based on the study’s empirical findings will assist in improved pricing, quality and supply management in the automotive manufacturing industry.
- Full Text:
- Date Issued: 2015
Knowledge and understanding of radiographers regarding supraspinatus outlet projection for shoulder impingement syndrome
- Authors: Willians, Razana
- Date: 2015
- Subjects: Radiography, Medical , Diagnosis, Radioscopic , Shoulder , Diagnostic imaging
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4456 , vital:20602
- Description: The shoulder is a complex anatomical structure and imaging plays an important role in the diagnosis and management of shoulder conditions. The complexity of the shoulder’s anatomy has led to the development of multiple radiographic projections and techniques within plain film imaging with each projection intended to demonstrate specific aspects of the anatomy of the shoulder. However, reproducing the required projections can be difficult especially if radiographers are not familiar with the projections and their evaluation criteria. Literature has revealed the importance of a comprehensive knowledge and understanding of anatomy, patient positioning, beam direction and centring point, and evaluation criteria to ensure a quality projection for accurate diagnoses. The aim of the study was to determine the knowledge and understanding of radiographers with regard to the supraspinatus outlet projection (SOP) for shoulder impingement syndrome (SIS) and its evaluation criteria. The inferences derived from the research findings were used to develop guidelines for a structured in-service training programme for practising radiographers to optimise their knowledge and understanding of the supraspinatus outlet projection in shoulder impingement syndrome. The proposed study followed a quantitative approach. Furthermore, a descriptive, exploratory, contextual design was employed. The research population consisted of practising radiographers working in the public and private hospitals of the Nelson Mandela Bay Municipality. The data were collected by means of a structured self-administered questionnaire. The questionnaire comprised of three sections. The first section requested demographic information from the participants. The second section assessed their knowledge and understanding regarding the scapular ‘Y’ and the supraspinatus outlet projections and shoulder impingement syndrome. The third section assessed their knowledge and understanding of anatomy and image evaluation/critiquing. The reliability and validity of the data collection instrument was ensured by conducting a pilot study and comparing the results with those of the main study. In addition, the expertise and guidance of a radiographer experienced in the clinical training of radiographers, the supervisor (who has twenty years’ experience in the teaching of radiographers) and a statistician was obtained. Descriptive and inferential statistical analyses were performed by means of a statistical programme and with the guidance of a statistician. The researcher ensured that the study was conducted in an ethical manner by adhering to the ethical principles of beneficence, justice and respect for persons.
- Full Text:
- Date Issued: 2015
- Authors: Willians, Razana
- Date: 2015
- Subjects: Radiography, Medical , Diagnosis, Radioscopic , Shoulder , Diagnostic imaging
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/4456 , vital:20602
- Description: The shoulder is a complex anatomical structure and imaging plays an important role in the diagnosis and management of shoulder conditions. The complexity of the shoulder’s anatomy has led to the development of multiple radiographic projections and techniques within plain film imaging with each projection intended to demonstrate specific aspects of the anatomy of the shoulder. However, reproducing the required projections can be difficult especially if radiographers are not familiar with the projections and their evaluation criteria. Literature has revealed the importance of a comprehensive knowledge and understanding of anatomy, patient positioning, beam direction and centring point, and evaluation criteria to ensure a quality projection for accurate diagnoses. The aim of the study was to determine the knowledge and understanding of radiographers with regard to the supraspinatus outlet projection (SOP) for shoulder impingement syndrome (SIS) and its evaluation criteria. The inferences derived from the research findings were used to develop guidelines for a structured in-service training programme for practising radiographers to optimise their knowledge and understanding of the supraspinatus outlet projection in shoulder impingement syndrome. The proposed study followed a quantitative approach. Furthermore, a descriptive, exploratory, contextual design was employed. The research population consisted of practising radiographers working in the public and private hospitals of the Nelson Mandela Bay Municipality. The data were collected by means of a structured self-administered questionnaire. The questionnaire comprised of three sections. The first section requested demographic information from the participants. The second section assessed their knowledge and understanding regarding the scapular ‘Y’ and the supraspinatus outlet projections and shoulder impingement syndrome. The third section assessed their knowledge and understanding of anatomy and image evaluation/critiquing. The reliability and validity of the data collection instrument was ensured by conducting a pilot study and comparing the results with those of the main study. In addition, the expertise and guidance of a radiographer experienced in the clinical training of radiographers, the supervisor (who has twenty years’ experience in the teaching of radiographers) and a statistician was obtained. Descriptive and inferential statistical analyses were performed by means of a statistical programme and with the guidance of a statistician. The researcher ensured that the study was conducted in an ethical manner by adhering to the ethical principles of beneficence, justice and respect for persons.
- Full Text:
- Date Issued: 2015
Single tree water use and water-use efficiencies of selected indigenous and introduced forest species in the southern Cape region of South Africa
- Authors: Mapeto, Tatenda
- Date: 2015
- Subjects: Irrigation efficiency -- South Africa -- Western Cape Pinus radiata -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/11493 , vital:26932
- Description: In South Africa, the limited extent of indigenous forests accelerated the development of fast-growing introduced species plantations, on which the country is now heavily reliant for its fibre and timber products. However, the plantation forestry industry is challenged with limited freshwater resources, the need for sustainable management of introduced tree species in commercial forest production systems, and a diversity of plant ecological production factors such as soils that have to be manipulated for the purposes of increasing production capacities. Additionally, plantations are established in the limited high rainfall regions of the country and the industry’s water use has been regulated since 1972. Conversely, natural forests also provide valuable goods, however, their slow growth rates have restricted their development as commercial tree production systems. In this regard the forestry industry is continuously seeking to provide for the country’s timber and fibre needs while ensuring the provision of other ecosystem services from tree production systems. Recent developments in the forestry industry have therefore been focused on water use efficiency in current and alternative tree production systems. There is also widespread unsubstantiated belief that indigenous tree species are efficient users of water. Against this background this study sought to explore the single tree water use and water use efficiencies of introduced commercial plantation species (Pinus radiata) and that of important indigenous species (Ilex mitis, Ocotea bullata and Podocarpus latifolius) for timber and fibre production in the southern Cape region of South Africa. Single tree water use measurements were carried out for a year using the heat pulse velocity method. Growth measurements for utilisable stem wood were done on a quarterly basis for the specimen trees and growth increments over the year were determined. Single tree water use efficiency was a calculated as a function of grams of stem wood gained per litre of water transpired. Measurements of daily weather conditions and soil water content were concurrently taken during the year. The relationships between the variables that express daily climatic conditions, soil water content and daily volumes of transpired water were explored. Empirical models for the prediction of daily transpiration as a function of climate and soil water content were then developed using multiple linear regression analysis. Pinus radiata trees exhibited higher totals of volumetric transpiration than the indigenous species. The water use patterns of Pinus radiata showed higher peaks of maximum and minimum daily and seasonal water use while the indigenous species showed temperate patterns of water use throughout the year. Podocarpus latifolius attained the lowest water use efficiency in the year (0.49g/L) while Pinus radiata, Ocotea bullata and Ilex mitis had comparable water use efficiency values ranging between 1g/L to 2.50g/L. Significant positive correlations existed between climatic variables and daily sapflow volumes of the tree specimens. Daily total solar radiation showed the highest positive correlation with daily transpiration and the average value of the correlation coefficient for solar radiation and water use for all tree species was 0.70 (p < 0.001). Empirical models for predicting daily water use integrated the variables expressing plant available moisture and energy. The study enhances our understanding of single tree water use, water use efficiency, the drivers of transpiration and the applicability of such studies in developing rapid estimation techniques for water use in current and alternative South African tree production systems.
- Full Text:
- Date Issued: 2015
- Authors: Mapeto, Tatenda
- Date: 2015
- Subjects: Irrigation efficiency -- South Africa -- Western Cape Pinus radiata -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/11493 , vital:26932
- Description: In South Africa, the limited extent of indigenous forests accelerated the development of fast-growing introduced species plantations, on which the country is now heavily reliant for its fibre and timber products. However, the plantation forestry industry is challenged with limited freshwater resources, the need for sustainable management of introduced tree species in commercial forest production systems, and a diversity of plant ecological production factors such as soils that have to be manipulated for the purposes of increasing production capacities. Additionally, plantations are established in the limited high rainfall regions of the country and the industry’s water use has been regulated since 1972. Conversely, natural forests also provide valuable goods, however, their slow growth rates have restricted their development as commercial tree production systems. In this regard the forestry industry is continuously seeking to provide for the country’s timber and fibre needs while ensuring the provision of other ecosystem services from tree production systems. Recent developments in the forestry industry have therefore been focused on water use efficiency in current and alternative tree production systems. There is also widespread unsubstantiated belief that indigenous tree species are efficient users of water. Against this background this study sought to explore the single tree water use and water use efficiencies of introduced commercial plantation species (Pinus radiata) and that of important indigenous species (Ilex mitis, Ocotea bullata and Podocarpus latifolius) for timber and fibre production in the southern Cape region of South Africa. Single tree water use measurements were carried out for a year using the heat pulse velocity method. Growth measurements for utilisable stem wood were done on a quarterly basis for the specimen trees and growth increments over the year were determined. Single tree water use efficiency was a calculated as a function of grams of stem wood gained per litre of water transpired. Measurements of daily weather conditions and soil water content were concurrently taken during the year. The relationships between the variables that express daily climatic conditions, soil water content and daily volumes of transpired water were explored. Empirical models for the prediction of daily transpiration as a function of climate and soil water content were then developed using multiple linear regression analysis. Pinus radiata trees exhibited higher totals of volumetric transpiration than the indigenous species. The water use patterns of Pinus radiata showed higher peaks of maximum and minimum daily and seasonal water use while the indigenous species showed temperate patterns of water use throughout the year. Podocarpus latifolius attained the lowest water use efficiency in the year (0.49g/L) while Pinus radiata, Ocotea bullata and Ilex mitis had comparable water use efficiency values ranging between 1g/L to 2.50g/L. Significant positive correlations existed between climatic variables and daily sapflow volumes of the tree specimens. Daily total solar radiation showed the highest positive correlation with daily transpiration and the average value of the correlation coefficient for solar radiation and water use for all tree species was 0.70 (p < 0.001). Empirical models for predicting daily water use integrated the variables expressing plant available moisture and energy. The study enhances our understanding of single tree water use, water use efficiency, the drivers of transpiration and the applicability of such studies in developing rapid estimation techniques for water use in current and alternative South African tree production systems.
- Full Text:
- Date Issued: 2015