Geometry of deformed special relativity
- Authors: Sixaba, Vuyile
- Date: 2018
- Subjects: Special relativity (Physics) , Quantum gravity , Quantum theory , Geometry , Heisenberg uncertainty principle
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59478 , vital:27615
- Description: We undertake a study of the classical regime in which Planck's constant and Newton's gravitational constant are negligible, but not their ratio, the Planck mass, in hopes that this could possibly lead to testable quantum gravity (QG) effects in a classical regime. In this quest for QG phenomenology we consider modifications of the standard dispersion relation of a free particle known as deformed special relativity (DSR). We try to geometrize DSR to find the geometric origin of the spacetime and momentum space. In particular, we adopt the framework of Hamilton geometry which is set up on phase space, as the cotangent bundle of configuration space in order to derive a purely phase space formulation of DSR. This is necessary when one wants to understand potential links of DSR with modifications of quantum mechanics such as Generalised Uncertainty Principles. It is subsequently observed that space-time and momentum space emerge naturally as curved and intertwined spaces. In conclusion we mention examples and applications of this framework as well as potential future developments.
- Full Text:
- Date Issued: 2018
- Authors: Sixaba, Vuyile
- Date: 2018
- Subjects: Special relativity (Physics) , Quantum gravity , Quantum theory , Geometry , Heisenberg uncertainty principle
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/59478 , vital:27615
- Description: We undertake a study of the classical regime in which Planck's constant and Newton's gravitational constant are negligible, but not their ratio, the Planck mass, in hopes that this could possibly lead to testable quantum gravity (QG) effects in a classical regime. In this quest for QG phenomenology we consider modifications of the standard dispersion relation of a free particle known as deformed special relativity (DSR). We try to geometrize DSR to find the geometric origin of the spacetime and momentum space. In particular, we adopt the framework of Hamilton geometry which is set up on phase space, as the cotangent bundle of configuration space in order to derive a purely phase space formulation of DSR. This is necessary when one wants to understand potential links of DSR with modifications of quantum mechanics such as Generalised Uncertainty Principles. It is subsequently observed that space-time and momentum space emerge naturally as curved and intertwined spaces. In conclusion we mention examples and applications of this framework as well as potential future developments.
- Full Text:
- Date Issued: 2018
An exploration of business level strategy at the bottom of the pyramid: a case study of Twizza, Eastern Cape
- Authors: Sityoshwana, Ludwe Lusu
- Date: 2015
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/54486 , vital:26569
- Description: This qualitative study focuses on business level strategy adopted by Twizza to compete in the bottom of the pyramid market in the Eastern Cape, South Africa. Twizza enjoyed huge success between the years 2010 - 2014 as a medium to large sized manufacturer of carbonated soft drinks in the Eastern Cape. In light of this, the current study seeks to answer the following: What business level strategy did top management at Twizza adopt to compete and grow in the BoP market in the Eastern Cape, South Africa? The study takes the form of a case study to explore and understand the patterns of decisions adopted by Twizza’s top management in competing at the bottom of the pyramid. As such, the main objective of the study was to identify the business level strategy adopted by Twizza which enabled their superior performance within the BoP market. The study adopts Porter`s typology to explore business level strategy. Stratified, purposive sampling was used to identify 4 top managers as participants in this study. A total of 7, semi-structured, interviews were used to collect critical incidents from top management of Twizza. This was the primary data used in this study. This type of data was combined with relevant information which was gathered via published press articles and on-line commentary. The study found that central to Twizza’s business strategy were four pillars, namely, strict control and management of manufacturing costs, product quality equal to that of market leaders, the ability of the organisation to manufacture its own raw materials and ability to ensure product availability to the market to the market. These findings reveal that Twizza employed a hybrid strategy, anchored by cost leadership. Thus, Twizza incorporated elements of differentiation and best value strategies to offer its customers affordable quality.
- Full Text:
- Date Issued: 2015
- Authors: Sityoshwana, Ludwe Lusu
- Date: 2015
- Language: English
- Type: text , Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/54486 , vital:26569
- Description: This qualitative study focuses on business level strategy adopted by Twizza to compete in the bottom of the pyramid market in the Eastern Cape, South Africa. Twizza enjoyed huge success between the years 2010 - 2014 as a medium to large sized manufacturer of carbonated soft drinks in the Eastern Cape. In light of this, the current study seeks to answer the following: What business level strategy did top management at Twizza adopt to compete and grow in the BoP market in the Eastern Cape, South Africa? The study takes the form of a case study to explore and understand the patterns of decisions adopted by Twizza’s top management in competing at the bottom of the pyramid. As such, the main objective of the study was to identify the business level strategy adopted by Twizza which enabled their superior performance within the BoP market. The study adopts Porter`s typology to explore business level strategy. Stratified, purposive sampling was used to identify 4 top managers as participants in this study. A total of 7, semi-structured, interviews were used to collect critical incidents from top management of Twizza. This was the primary data used in this study. This type of data was combined with relevant information which was gathered via published press articles and on-line commentary. The study found that central to Twizza’s business strategy were four pillars, namely, strict control and management of manufacturing costs, product quality equal to that of market leaders, the ability of the organisation to manufacture its own raw materials and ability to ensure product availability to the market to the market. These findings reveal that Twizza employed a hybrid strategy, anchored by cost leadership. Thus, Twizza incorporated elements of differentiation and best value strategies to offer its customers affordable quality.
- Full Text:
- Date Issued: 2015
Morphological and genetic variation of Gymnothorax undulatus (Anguilliformes: Muraenidae) in the Western Indian Ocean
- Authors: Sithole, Yonela
- Date: 2018
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63722 , vital:28476
- Description: Expected release date-April 2019
- Full Text:
- Date Issued: 2018
- Authors: Sithole, Yonela
- Date: 2018
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63722 , vital:28476
- Description: Expected release date-April 2019
- Full Text:
- Date Issued: 2018
Either way you die: a collection of short stories
- Authors: Sithole, Sipho
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/145081 , vital:38406
- Description: Part A: Thesis (Creative Work); Part B: Portfolio.
- Full Text:
- Date Issued: 2020
- Authors: Sithole, Sipho
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/145081 , vital:38406
- Description: Part A: Thesis (Creative Work); Part B: Portfolio.
- Full Text:
- Date Issued: 2020
Investigating the role of extension officers in supporting social learning of rainwater harvesting practices amongst rural smallholder farmers in Nkonkobe Local Municipality, Eastern Cape
- Authors: Sithole, Phindile Nomfundo
- Date: 2019
- Subjects: Water harvesting -- South Africa -- Eastern Cape , Rainwater -- South Africa -- Eastern Cape , Water-supply, Agricultural -- South Africa -- Eastern Cape , Water-supply, Rural -- South Africa -- Eastern Cape , Agricultural extension workers -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/96757 , vital:31316
- Description: Water is essential for food production, however South Africa’s water is already under pressure due to increasing population, food demand, and climate change, amongst other factors. Over the past years, there has been increasing demand for agricultural water use for food production due to these factors. Rainwater harvesting and conservation (RWH&C) for food production is one of the most promising approaches to address increasing demand of water. The Rhodes University Environmental Learning Research Centre have led a project with the Water Research Commission (Project No. K5/2277) focusing on the dissemination of RWH&C practice knowledge that involves some of the extension services in the Nkonkobe Municipality in the Eastern Cape, called the ‘Amanzi [Water] for Food’ project. While extension services were included in the project, the wider role of extension services in ‘disseminating’ RWH&C knowledge amongst farmers is not clear, a problem which provides the focus for this research, especially since there are changes in the designated role of extension services to become more responsive and reflexive in relation to farmers emerging needs, and in response to wider issues such as climate change and water scarcity. In general, there is agreement that the role of extension is to be active within the farming community, to facilitate social interactions and collaborative processes that often focus on activities that are intended to find, assess, interpret and adapt information, knowledge and evidence that are suitable for farmer’s needs. Extension should also be available to identify arising issues that the farmers experience that can be solved by the use of research knowledge. However, little is known with regard to whether extension officers are taking up this role effectively, especially in relation to RWH&C knowledge. Using document analysis, semi-structured interviews, field-based observations and focus group discussions, this research seeks to demonstrate the role of extension services in facilitating and supporting social learning of RWH&C practices amongst rural smallholder farmers for improved food security. It provides insight into the way in which extension officers are able to facilitate social learning using RWH&C knowledge, and the issues that affect the adoption of social learning approaches to extension support related to RWH&C knowledge uptake and dissemination.
- Full Text:
- Date Issued: 2019
- Authors: Sithole, Phindile Nomfundo
- Date: 2019
- Subjects: Water harvesting -- South Africa -- Eastern Cape , Rainwater -- South Africa -- Eastern Cape , Water-supply, Agricultural -- South Africa -- Eastern Cape , Water-supply, Rural -- South Africa -- Eastern Cape , Agricultural extension workers -- South Africa -- Eastern Cape
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/96757 , vital:31316
- Description: Water is essential for food production, however South Africa’s water is already under pressure due to increasing population, food demand, and climate change, amongst other factors. Over the past years, there has been increasing demand for agricultural water use for food production due to these factors. Rainwater harvesting and conservation (RWH&C) for food production is one of the most promising approaches to address increasing demand of water. The Rhodes University Environmental Learning Research Centre have led a project with the Water Research Commission (Project No. K5/2277) focusing on the dissemination of RWH&C practice knowledge that involves some of the extension services in the Nkonkobe Municipality in the Eastern Cape, called the ‘Amanzi [Water] for Food’ project. While extension services were included in the project, the wider role of extension services in ‘disseminating’ RWH&C knowledge amongst farmers is not clear, a problem which provides the focus for this research, especially since there are changes in the designated role of extension services to become more responsive and reflexive in relation to farmers emerging needs, and in response to wider issues such as climate change and water scarcity. In general, there is agreement that the role of extension is to be active within the farming community, to facilitate social interactions and collaborative processes that often focus on activities that are intended to find, assess, interpret and adapt information, knowledge and evidence that are suitable for farmer’s needs. Extension should also be available to identify arising issues that the farmers experience that can be solved by the use of research knowledge. However, little is known with regard to whether extension officers are taking up this role effectively, especially in relation to RWH&C knowledge. Using document analysis, semi-structured interviews, field-based observations and focus group discussions, this research seeks to demonstrate the role of extension services in facilitating and supporting social learning of RWH&C practices amongst rural smallholder farmers for improved food security. It provides insight into the way in which extension officers are able to facilitate social learning using RWH&C knowledge, and the issues that affect the adoption of social learning approaches to extension support related to RWH&C knowledge uptake and dissemination.
- Full Text:
- Date Issued: 2019
An investigation of the security of passwords derived from African languages
- Authors: Sishi, Sibusiso Teboho
- Date: 2019
- Subjects: Computers -- Access control -- Passwords , Computer users -- Attitudes , Internet -- Access control , Internet -- Security measures , Internet -- Management , Data protection
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/163273 , vital:41024
- Description: Password authentication has become ubiquitous in the cyber age. To-date, there have been several studies on country based passwords by authors who studied, amongst others, English, Finnish, Italian and Chinese based passwords. However, there has been a lack of focused study on the type of passwords that are being created in Africa and whether there are benefits in creating passwords in an African language. For this research, password databases containing LAN Manager (LM) and NT LAN Manager (NTLM) hashes extracted from South African organisations in a variety of sectors in the economy, were obtained to gain an understanding of user behaviour in creating passwords. Analysis of the passwords obtained from these hashes (using several cracking methods) showed that many organisational passwords are based on the English language. This is understandable considering that the business language in South Africa is English even though South Africa has 11 official languages. African language based passwords were derived from known English weak passwords and some of the passwords were appended with numbers and special characters. The African based passwords created using eight Southern African languages were then uploaded to the Internet to test the security around using passwords based on African languages. Since most of the passwords were able to be cracked by third party researchers, we conclude that any password that is derived from known weak English words marked no improvement in the security of a password written in an African language, especially the more widely spoken languages, namely, isiZulu, isiXhosa and Setswana.
- Full Text:
- Date Issued: 2019
- Authors: Sishi, Sibusiso Teboho
- Date: 2019
- Subjects: Computers -- Access control -- Passwords , Computer users -- Attitudes , Internet -- Access control , Internet -- Security measures , Internet -- Management , Data protection
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/163273 , vital:41024
- Description: Password authentication has become ubiquitous in the cyber age. To-date, there have been several studies on country based passwords by authors who studied, amongst others, English, Finnish, Italian and Chinese based passwords. However, there has been a lack of focused study on the type of passwords that are being created in Africa and whether there are benefits in creating passwords in an African language. For this research, password databases containing LAN Manager (LM) and NT LAN Manager (NTLM) hashes extracted from South African organisations in a variety of sectors in the economy, were obtained to gain an understanding of user behaviour in creating passwords. Analysis of the passwords obtained from these hashes (using several cracking methods) showed that many organisational passwords are based on the English language. This is understandable considering that the business language in South Africa is English even though South Africa has 11 official languages. African language based passwords were derived from known English weak passwords and some of the passwords were appended with numbers and special characters. The African based passwords created using eight Southern African languages were then uploaded to the Internet to test the security around using passwords based on African languages. Since most of the passwords were able to be cracked by third party researchers, we conclude that any password that is derived from known weak English words marked no improvement in the security of a password written in an African language, especially the more widely spoken languages, namely, isiZulu, isiXhosa and Setswana.
- Full Text:
- Date Issued: 2019
Exploring opportunities for integrating indigenous knowledge and practices into animal husbandry in Grade 10 Agricultural Science lessons
- Authors: Siseho, Robert Simwanza
- Date: 2019
- Subjects: Agriculture -- Study and teaching -- Namibia , Ethnoscience -- Study and teaching -- Namibia , Ethnoscience -- Namibia
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/96790 , vital:31320
- Description: The performance of learners in Agricultural Science at secondary schools in the Omaheke region of Namibia is worrisome. For some years performance in the subject has been below the national average, even though the region is known for its agricultural activities. My assumption is that this could be compounded by the fact that even though the Namibian curriculum encourages teachers to integrate local or indigenous knowledge (IK) in their lessons, it is not clear how this should be executed. It is against this background that this study set out to explore opportunities for integrating indigenous animal husbandry knowledge and practices into the animal husbandry section of Namibian Grade 10 Agricultural Science lessons. This was a qualitative case study underpinned by the interpretive paradigm. The study first focused on finding out what practices and knowledge might be integrated into animal husbandry within Grade 10 Agricultural Science. Secondly, it aimed at finding strategies for integrating indigenous knowledge into Grade 10 Agricultural Science. Thirdly, using my experience of co-developing model lessons with two Grade 10 Agricultural Science teachers, it sought to identify what assistance teachers need to integrate IK. The fourth goal was to observe the lessons taught in order to find out how the two teachers mediated the lessons featuring IK. Data were collected using interviews, workshop discussions, observations (videotaped lessons) and reflections. The data were validated through member checking and triangulation via various techniques. I used Vygotsky’s (1978) sociocultural theory and Wenger’s (1998) community of practice as a composite lens to analyse my data. The findings showed that there is indigenous knowledge in animal husbandry of disease prevention and treatment, the feeding of livestock, castration, de-horning and parasite control. Strategies to integrate IK included inviting or visiting parents or farmers, using the learners’ mother tongue and exploiting local resources. It emerged that teachers need help with teaching strategies, the development of worksheets, lesson planning and the use of technology. The mediation of the lessons included use of the chalkboard and a data projector, worksheets, the teacher assisting learners, and learners assisting one another. The study recommends that teachers integrate IK into their lessons to contextualize learning, increase learners’ participation in class and enhance their understanding of science. It also recommends that curriculum developers make it clear how IK should be integrated and assessed. The study further recommends that institutions of higher education should train teachers on how to integrate IK in the curriculum.
- Full Text:
- Date Issued: 2019
- Authors: Siseho, Robert Simwanza
- Date: 2019
- Subjects: Agriculture -- Study and teaching -- Namibia , Ethnoscience -- Study and teaching -- Namibia , Ethnoscience -- Namibia
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/96790 , vital:31320
- Description: The performance of learners in Agricultural Science at secondary schools in the Omaheke region of Namibia is worrisome. For some years performance in the subject has been below the national average, even though the region is known for its agricultural activities. My assumption is that this could be compounded by the fact that even though the Namibian curriculum encourages teachers to integrate local or indigenous knowledge (IK) in their lessons, it is not clear how this should be executed. It is against this background that this study set out to explore opportunities for integrating indigenous animal husbandry knowledge and practices into the animal husbandry section of Namibian Grade 10 Agricultural Science lessons. This was a qualitative case study underpinned by the interpretive paradigm. The study first focused on finding out what practices and knowledge might be integrated into animal husbandry within Grade 10 Agricultural Science. Secondly, it aimed at finding strategies for integrating indigenous knowledge into Grade 10 Agricultural Science. Thirdly, using my experience of co-developing model lessons with two Grade 10 Agricultural Science teachers, it sought to identify what assistance teachers need to integrate IK. The fourth goal was to observe the lessons taught in order to find out how the two teachers mediated the lessons featuring IK. Data were collected using interviews, workshop discussions, observations (videotaped lessons) and reflections. The data were validated through member checking and triangulation via various techniques. I used Vygotsky’s (1978) sociocultural theory and Wenger’s (1998) community of practice as a composite lens to analyse my data. The findings showed that there is indigenous knowledge in animal husbandry of disease prevention and treatment, the feeding of livestock, castration, de-horning and parasite control. Strategies to integrate IK included inviting or visiting parents or farmers, using the learners’ mother tongue and exploiting local resources. It emerged that teachers need help with teaching strategies, the development of worksheets, lesson planning and the use of technology. The mediation of the lessons included use of the chalkboard and a data projector, worksheets, the teacher assisting learners, and learners assisting one another. The study recommends that teachers integrate IK into their lessons to contextualize learning, increase learners’ participation in class and enhance their understanding of science. It also recommends that curriculum developers make it clear how IK should be integrated and assessed. The study further recommends that institutions of higher education should train teachers on how to integrate IK in the curriculum.
- Full Text:
- Date Issued: 2019
Adolescent pregnancy: a community engaged participatory approach to design and implement an educational intervention
- Authors: Siruma, Amanda Tatenda
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MPharm
- Identifier: http://hdl.handle.net/10962/54656 , vital:26597
- Description: Millennium Development Goal (MDG) 5 focuses on improving maternal health, due to global acknowledgment that no woman should have to die as a result of complications during pregnancy and childbirth. Adolescents have an increased risk of maternal death compared with older women. Adolescent pregnancy also poses a threat to the empowerment of young girls by mitigating their physical, educational, social, and economic development. In this context, maternal health promotion strategies which inclusively target adolescents are crucial, not only in improving maternal health outcomes, but also in optimising the overall transition of adolescent girls to adulthood. This study was a first time collaborative partnership of the Faculty of Pharmacy and Community Engagement Office of Rhodes University with the Angus Gillis Foundation (a non-profit community development organisation), and community participants of Glenmore and Ndwayana, two rural communities in the Eastern Cape. The aim of this study was to identify the maternal health issue of most concern to community participants and to design and implement an appropriate educational intervention for a suitable target group. During the baseline phase of this study, ten focus group discussions (FGDs) were conducted with 76 community stakeholders. Semi-structured interviews (SSIs) were conducted with two Sisters-in-Charge from each Primary Health Care (PHC) facility in the study setting. Data on the stock status of World Health Organization (WHO) identified lifesaving priority medicines for women’s health was also collected at both PHCs. Thereafter, pre- and posteducational interventions SSIs with female adolescent participants were conducted. The educational intervention was followed up with the development of a booklet on reproductive health. FGD participants identified adolescent pregnancy as the maternal health issue of most concern. They also highlighted challenges in service delivery of ambulance services for expectant mothers in urgent need of transportation to a referral hospital. A majority of preintervention SSI participants indicated coercion from both younger and older men as a factor influencing early sexual debut amongst adolescent girls in their communities. Despite availability in the PHCs, challenges in accessing contraceptives were highlighted by the participants. Additionally, a number of sexually active adolescent girls defaulted on their next allocated visit to the PHC due to myths regarding use of oral and injectable contraceptives. During the educational intervention sessions, participants recognised knowledge gaps regarding reproductive health issues and the influence of peer pressure as constraining factors in preventing adolescent pregnancy. During the post-intervention phase, participants highlighted that the educational intervention of this study had provided a forum to discuss ways of preventing adolescent pregnancy. The educational booklet developed is intended to serve as a resource tool of the educational programme on prevention of adolescent pregnancy, which is expected to be incorporated into the Angus Gillis Foundation’s existing ‘Positive Health’ Programme. The results of this study show that community-based participatory research facilitated the identification of the maternal health issue of most concern to these communities. Working synergistically with key stakeholders in designing and implementing an educational intervention for preventing adolescent pregnancy provides a good foundation for future up scaling and sustainability of this educational programme.
- Full Text:
- Date Issued: 2014
- Authors: Siruma, Amanda Tatenda
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MPharm
- Identifier: http://hdl.handle.net/10962/54656 , vital:26597
- Description: Millennium Development Goal (MDG) 5 focuses on improving maternal health, due to global acknowledgment that no woman should have to die as a result of complications during pregnancy and childbirth. Adolescents have an increased risk of maternal death compared with older women. Adolescent pregnancy also poses a threat to the empowerment of young girls by mitigating their physical, educational, social, and economic development. In this context, maternal health promotion strategies which inclusively target adolescents are crucial, not only in improving maternal health outcomes, but also in optimising the overall transition of adolescent girls to adulthood. This study was a first time collaborative partnership of the Faculty of Pharmacy and Community Engagement Office of Rhodes University with the Angus Gillis Foundation (a non-profit community development organisation), and community participants of Glenmore and Ndwayana, two rural communities in the Eastern Cape. The aim of this study was to identify the maternal health issue of most concern to community participants and to design and implement an appropriate educational intervention for a suitable target group. During the baseline phase of this study, ten focus group discussions (FGDs) were conducted with 76 community stakeholders. Semi-structured interviews (SSIs) were conducted with two Sisters-in-Charge from each Primary Health Care (PHC) facility in the study setting. Data on the stock status of World Health Organization (WHO) identified lifesaving priority medicines for women’s health was also collected at both PHCs. Thereafter, pre- and posteducational interventions SSIs with female adolescent participants were conducted. The educational intervention was followed up with the development of a booklet on reproductive health. FGD participants identified adolescent pregnancy as the maternal health issue of most concern. They also highlighted challenges in service delivery of ambulance services for expectant mothers in urgent need of transportation to a referral hospital. A majority of preintervention SSI participants indicated coercion from both younger and older men as a factor influencing early sexual debut amongst adolescent girls in their communities. Despite availability in the PHCs, challenges in accessing contraceptives were highlighted by the participants. Additionally, a number of sexually active adolescent girls defaulted on their next allocated visit to the PHC due to myths regarding use of oral and injectable contraceptives. During the educational intervention sessions, participants recognised knowledge gaps regarding reproductive health issues and the influence of peer pressure as constraining factors in preventing adolescent pregnancy. During the post-intervention phase, participants highlighted that the educational intervention of this study had provided a forum to discuss ways of preventing adolescent pregnancy. The educational booklet developed is intended to serve as a resource tool of the educational programme on prevention of adolescent pregnancy, which is expected to be incorporated into the Angus Gillis Foundation’s existing ‘Positive Health’ Programme. The results of this study show that community-based participatory research facilitated the identification of the maternal health issue of most concern to these communities. Working synergistically with key stakeholders in designing and implementing an educational intervention for preventing adolescent pregnancy provides a good foundation for future up scaling and sustainability of this educational programme.
- Full Text:
- Date Issued: 2014
Crossing shades
- Authors: Singh, Shareen
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/145049 , vital:38404
- Description: This collection of stories draw on culture, history, memory, musings and imagination. The stories are set primarily in South Africa but includes travels to other countries. I explore journeys to different worlds and minds. I challenge the reader to see how place and time influence our ways of seeing, living and evolving. I use different forms and tones that resonate with the subjective nature of each creative piece. My writing includes formal prose as well as works that experiment with fragments, vignettes and flash fiction.
- Full Text:
- Date Issued: 2020
- Authors: Singh, Shareen
- Date: 2020
- Subjects: South African fiction (English) -- 21st century
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/145049 , vital:38404
- Description: This collection of stories draw on culture, history, memory, musings and imagination. The stories are set primarily in South Africa but includes travels to other countries. I explore journeys to different worlds and minds. I challenge the reader to see how place and time influence our ways of seeing, living and evolving. I use different forms and tones that resonate with the subjective nature of each creative piece. My writing includes formal prose as well as works that experiment with fragments, vignettes and flash fiction.
- Full Text:
- Date Issued: 2020
The tax consequences of income and expenses arising from illegal activities
- Authors: Singh, Shalona
- Date: 2018
- Subjects: South Africa. Income Tax Act, 1962 , Income tax South Africa , Tax evasion South Africa , Taxation Law and legislation South Africa Criminal provisions , Crime Economic aspects South Africa
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/59456 , vital:27609
- Description: Income tax in South Africa is levied in terms of the Income Tax Act, 58 of 1962 (the South African Income Tax Act) on taxable income, which by definition, is arrived at by deducting from ''gross income" receipts and accruals that are exempt from tax as well as deductions and allowances provided for in the Act. The South African Income Tax Act provides no guidance with regard to the taxation of income and expenditure from illegal activities. In this mini thesis, case law and legislation is reviewed in an attempt to provide clarity on the tax consequences of income and expenses arising from illegal activities. An overview is provided of the taxation of income and expenditure in respect of illegal activities in the United States of America, Australia and New Zealand. Similarities are found between the American, Australian, New Zealand and South African tax regimes in relation to the taxation of income earned from illegal activities, but there appears to be more certainty in America, Australia and New Zealand with regard to the deduction of expenses arising from illegal activities. In South Africa, taxpayers earning income from ongoing illegal activities will, in principle, comply with the definition of “trade” as defined in section 1 of the South African Income Tax Act. However, this is contrary to the view of the South African Revenue Service that illegal activities do not meet the definition of “trade”, a viewpoint that may not hold if challenged in court. Recommendations are made for the amendment of the South African Income Tax Act to specifically provide for the inclusion in “gross income” of income from illegal activities and to prohibit the deduction of expenditure arising from illegal activities.
- Full Text:
- Date Issued: 2018
- Authors: Singh, Shalona
- Date: 2018
- Subjects: South Africa. Income Tax Act, 1962 , Income tax South Africa , Tax evasion South Africa , Taxation Law and legislation South Africa Criminal provisions , Crime Economic aspects South Africa
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/59456 , vital:27609
- Description: Income tax in South Africa is levied in terms of the Income Tax Act, 58 of 1962 (the South African Income Tax Act) on taxable income, which by definition, is arrived at by deducting from ''gross income" receipts and accruals that are exempt from tax as well as deductions and allowances provided for in the Act. The South African Income Tax Act provides no guidance with regard to the taxation of income and expenditure from illegal activities. In this mini thesis, case law and legislation is reviewed in an attempt to provide clarity on the tax consequences of income and expenses arising from illegal activities. An overview is provided of the taxation of income and expenditure in respect of illegal activities in the United States of America, Australia and New Zealand. Similarities are found between the American, Australian, New Zealand and South African tax regimes in relation to the taxation of income earned from illegal activities, but there appears to be more certainty in America, Australia and New Zealand with regard to the deduction of expenses arising from illegal activities. In South Africa, taxpayers earning income from ongoing illegal activities will, in principle, comply with the definition of “trade” as defined in section 1 of the South African Income Tax Act. However, this is contrary to the view of the South African Revenue Service that illegal activities do not meet the definition of “trade”, a viewpoint that may not hold if challenged in court. Recommendations are made for the amendment of the South African Income Tax Act to specifically provide for the inclusion in “gross income” of income from illegal activities and to prohibit the deduction of expenditure arising from illegal activities.
- Full Text:
- Date Issued: 2018
Synthesis of indium phthalocyanines for photodynamic antimicrobial chemotherapy and photo-oxidation of pollutants
- Authors: Sindelo, Azole
- Date: 2019
- Subjects: Phthalocyanines , Azo dyes , Indium compounds , Photochemotherapy , Nanoparticles , Photodegradation , Pollutants , Water -- Purification
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/67581 , vital:29116
- Description: Indium (III) octacarboxyl phthalocyanine (ClInOCPc) alone and when conjugated to magnetic nanoparticles (MNP-ClInOCPc), 2(3),9(10),16(17),23(24)-octapyridylsulfanyl phthalocyaninato chloroindium (III) (ClInOPyPc) and its quaternized derivative 2(3),9(10),16(17),23(24)-octamethylpyridylsulfanyl phthalocyaninato chloroindium (III) (ClInOMePyPc) were synthesized. All Pcs were tested for both photodynamic antimicrobial chemotherapy (PACT) of an unknown water sample and photo-degradation of methyl red (MR). The singlet quantum yield (ΦΔ) for the ClInOCPc and MNP-ClInOCPc in PAN polymer fibers were 0.36 and 0.20 respectively using ADMA as a quencher in water. The photo-inactivation of bacteria in a water sample with unknown microbes was tested, with the MNP-ClInOCPc inactivating 90.6 % of the microbes and the ClInOCPc with 84.8 %. When embedded to the polymer, there was 48% bacterial clearance for ClInOCPc and 64% clearance for the MNP-ClInOCPc. The rate of degradation of MR increased with decrease of the MR concentration, with the MNP-ClInOCPc having the fastest rate. For ClInOPyPc and ClInOMePyPc, the singlet quantum yields were 0.46 and 0.33 in dimethylformamide (DMF), respectively. The PACT activity of ClInOMePyPc (containing 8 positive charges) was compared to those of 9(10),16(17),23(24)-tri-N-methyl-4-pyridylsulfanyl-2(3)-(4-aminophenoxy) phthalocyaninato chloro indium (III) triiodide (1) (containing 3 positive charges) and 2-[4-(N-methylpyridyloxy) phthalocyaninato] chloroindium (III) iodide (2) (containing 4 positive charges). When comparing ClInOMePyPc, 1 and 2, the largest log reduction for E. coli were obtained for complex 2 containing four positive charges hence showing it is not always the charge that determines the PACT activity, but the bridging atom in the phthalocyanine plays a role.
- Full Text:
- Date Issued: 2019
- Authors: Sindelo, Azole
- Date: 2019
- Subjects: Phthalocyanines , Azo dyes , Indium compounds , Photochemotherapy , Nanoparticles , Photodegradation , Pollutants , Water -- Purification
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/67581 , vital:29116
- Description: Indium (III) octacarboxyl phthalocyanine (ClInOCPc) alone and when conjugated to magnetic nanoparticles (MNP-ClInOCPc), 2(3),9(10),16(17),23(24)-octapyridylsulfanyl phthalocyaninato chloroindium (III) (ClInOPyPc) and its quaternized derivative 2(3),9(10),16(17),23(24)-octamethylpyridylsulfanyl phthalocyaninato chloroindium (III) (ClInOMePyPc) were synthesized. All Pcs were tested for both photodynamic antimicrobial chemotherapy (PACT) of an unknown water sample and photo-degradation of methyl red (MR). The singlet quantum yield (ΦΔ) for the ClInOCPc and MNP-ClInOCPc in PAN polymer fibers were 0.36 and 0.20 respectively using ADMA as a quencher in water. The photo-inactivation of bacteria in a water sample with unknown microbes was tested, with the MNP-ClInOCPc inactivating 90.6 % of the microbes and the ClInOCPc with 84.8 %. When embedded to the polymer, there was 48% bacterial clearance for ClInOCPc and 64% clearance for the MNP-ClInOCPc. The rate of degradation of MR increased with decrease of the MR concentration, with the MNP-ClInOCPc having the fastest rate. For ClInOPyPc and ClInOMePyPc, the singlet quantum yields were 0.46 and 0.33 in dimethylformamide (DMF), respectively. The PACT activity of ClInOMePyPc (containing 8 positive charges) was compared to those of 9(10),16(17),23(24)-tri-N-methyl-4-pyridylsulfanyl-2(3)-(4-aminophenoxy) phthalocyaninato chloro indium (III) triiodide (1) (containing 3 positive charges) and 2-[4-(N-methylpyridyloxy) phthalocyaninato] chloroindium (III) iodide (2) (containing 4 positive charges). When comparing ClInOMePyPc, 1 and 2, the largest log reduction for E. coli were obtained for complex 2 containing four positive charges hence showing it is not always the charge that determines the PACT activity, but the bridging atom in the phthalocyanine plays a role.
- Full Text:
- Date Issued: 2019
A critical analysis of the tax consequences of debt reductons, in the context of insolvency, death and the liquidaton of a deceased estate
- Authors: Simango, Samuel
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/54464 , vital:26567
- Description: The present research was conducted in an effort to address certain problems and a legal anomaly that is specifically related to the tax treatment of reduced debts stemming from the death or insolvency of natural persons in South Africa. At the beginning of 2013 the National Treasury enacted certain amendments to the debt reduction provisions of the Income Tax Act 58 of 1962 with the intention of streamlining the tax treatment of reduced debts and granting debt relief to financially distressed debtors. In spite of these recent amendments to the provisions of the Income Tax Act, there are certain problems and a legal anomaly which still currently relate to the tax consequences of reduced debts in South Africa. These problems and the legal anomaly are based on the failure of the recent amendments to successfully address debt reduction which arises in the context of the death and/or insolvency of natural persons. The objective of this research was therefore to analyse the tax consequences of reduced debts arising in the context of the death and the insolvency of natural persons and to explain how the problems and legal anomaly associated with these tax consequences can be rectified. The research design was qualitative within the framework of an interpretive paradigm. A mixed methodology approach was followed as identified in the Arthurs Report (1983), namely the interdisciplinary and the doctrinal methodologies. This approach encompassed two legal research methods namely the expository and legal reform research methods. The research explained the underlying nature of the tax consequences of reduced debts arising in the context of the death and the insolvency of natural persons and formulated specific reform measures aimed at remedying the problems and the legal anomaly that currently exist. Two amendments were proposed. It was proposed that the tax liability which arises when debts are reduced through the wills of deceased persons and the reduction of debts stemming from the insolvency of natural persons should be expressly excluded from falling within the ambit of the provisions which give rise to tax consequences whenever debt reduction takes place.
- Full Text:
- Date Issued: 2014
- Authors: Simango, Samuel
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/54464 , vital:26567
- Description: The present research was conducted in an effort to address certain problems and a legal anomaly that is specifically related to the tax treatment of reduced debts stemming from the death or insolvency of natural persons in South Africa. At the beginning of 2013 the National Treasury enacted certain amendments to the debt reduction provisions of the Income Tax Act 58 of 1962 with the intention of streamlining the tax treatment of reduced debts and granting debt relief to financially distressed debtors. In spite of these recent amendments to the provisions of the Income Tax Act, there are certain problems and a legal anomaly which still currently relate to the tax consequences of reduced debts in South Africa. These problems and the legal anomaly are based on the failure of the recent amendments to successfully address debt reduction which arises in the context of the death and/or insolvency of natural persons. The objective of this research was therefore to analyse the tax consequences of reduced debts arising in the context of the death and the insolvency of natural persons and to explain how the problems and legal anomaly associated with these tax consequences can be rectified. The research design was qualitative within the framework of an interpretive paradigm. A mixed methodology approach was followed as identified in the Arthurs Report (1983), namely the interdisciplinary and the doctrinal methodologies. This approach encompassed two legal research methods namely the expository and legal reform research methods. The research explained the underlying nature of the tax consequences of reduced debts arising in the context of the death and the insolvency of natural persons and formulated specific reform measures aimed at remedying the problems and the legal anomaly that currently exist. Two amendments were proposed. It was proposed that the tax liability which arises when debts are reduced through the wills of deceased persons and the reduction of debts stemming from the insolvency of natural persons should be expressly excluded from falling within the ambit of the provisions which give rise to tax consequences whenever debt reduction takes place.
- Full Text:
- Date Issued: 2014
“Ntombazana, ugayela bani?”: ubunzululwazi beentsimbi
- Authors: Silo, Tolakele Talitha
- Date: 2020
- Subjects: Beadwork, Xhosa , Xhosa (African people) -- Social life and customs , Beadwork, Tembu , Tembu (African people) -- Social life and customs
- Language: Xhosa
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/167487 , vital:41485
- Description: “ NTOMBAZANA, UGAYELA BANI?”: UBUNZULULWAZI BEENTSIMBI is a study on the culture of abaThembu, one of the amaXhosa subgroups. Focusing on beadwork as one of this group’s cultural aspects, this research is an initiative to ensure documentation of such indigenous knowledge as an influence on the lifestyle of abaThembu. It also strives to uplift the use of oral literature to present it a fair chance at being a driving force for change as it has previously been ousted with the acceptability of written literature. Of great surprise is to see that despite western civilization, which affected the people’s culture, beadwork remains a pillar of the abaThembu-amaXhosa culture. This craft has evolved and thus, shows no signs of regression. This thesis is an indigenous knowledge focused research.
- Full Text:
- Date Issued: 2020
- Authors: Silo, Tolakele Talitha
- Date: 2020
- Subjects: Beadwork, Xhosa , Xhosa (African people) -- Social life and customs , Beadwork, Tembu , Tembu (African people) -- Social life and customs
- Language: Xhosa
- Type: text , Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/167487 , vital:41485
- Description: “ NTOMBAZANA, UGAYELA BANI?”: UBUNZULULWAZI BEENTSIMBI is a study on the culture of abaThembu, one of the amaXhosa subgroups. Focusing on beadwork as one of this group’s cultural aspects, this research is an initiative to ensure documentation of such indigenous knowledge as an influence on the lifestyle of abaThembu. It also strives to uplift the use of oral literature to present it a fair chance at being a driving force for change as it has previously been ousted with the acceptability of written literature. Of great surprise is to see that despite western civilization, which affected the people’s culture, beadwork remains a pillar of the abaThembu-amaXhosa culture. This craft has evolved and thus, shows no signs of regression. This thesis is an indigenous knowledge focused research.
- Full Text:
- Date Issued: 2020
The effect of teaching text organisation on reading in English as a second language
- Authors: Silburn, Gail Deirdre
- Date: 1991
- Subjects: English language -- Study and teaching -- Foreign speakers
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: vital:1372 , http://hdl.handle.net/10962/d1001438
- Description: This research investigated the effect of teaching text organisation on reading in English second language to schoolgirls. All subjects underwent a training programme of five one-hour sessions on consecutive school days. The experimental group were trained in the use and recognition of top-level organisation as a reading strategy, based on work done by Bartlett (1978) and Carrell (1985). The control group were trained in unrelated grammar exercises. A pre-test was administered to each group before their programme began. Post-test 1 was administered immediately after the training was completed, and Post-test 2, three weeks later. These tests required a written recall of two passages once they had been read, and an answer to a question on their organisation. The null hypotheses stated that the experimental group's training in the use and recognition of top-level organisation as a reading strategy would make no difference in their ability to read and recall information or to recognise and use top-level organisation in their recalls. For the quantity of information recalled, no differences were found in the Pre-test and Post-test 1; a statistically significant difference was found in Post-test 2 in favour of the experimental group. For the quality of information recalled, the control group remembered more top-level idea units in the Pre-test; there was no difference in Post-test 1; the experimental group did better in three out of five levels in Post-test 2. There was no difference in the Pretest in either group's use of the passage's top-level organisation to structure recalls, but the experimental group did better in both post-tests. The control group did better in the Pre-test in recognising the passage's top-level organisation, but the experimental group did better in both post-tests. The null hypotheses were rejected as the experimental training made a difference, although this difference only became apparent three weeks later, and not immediately after the training. The experimental group's nullifying the control group's Pre-test advantage in Post-test 1 and surpassing it in Post-test 2, powerfully supports Bartlett's and Carrell's findings that teaching the strategy did make a difference and that this effect could be maintained over three weeks
- Full Text:
- Date Issued: 1991
- Authors: Silburn, Gail Deirdre
- Date: 1991
- Subjects: English language -- Study and teaching -- Foreign speakers
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: vital:1372 , http://hdl.handle.net/10962/d1001438
- Description: This research investigated the effect of teaching text organisation on reading in English second language to schoolgirls. All subjects underwent a training programme of five one-hour sessions on consecutive school days. The experimental group were trained in the use and recognition of top-level organisation as a reading strategy, based on work done by Bartlett (1978) and Carrell (1985). The control group were trained in unrelated grammar exercises. A pre-test was administered to each group before their programme began. Post-test 1 was administered immediately after the training was completed, and Post-test 2, three weeks later. These tests required a written recall of two passages once they had been read, and an answer to a question on their organisation. The null hypotheses stated that the experimental group's training in the use and recognition of top-level organisation as a reading strategy would make no difference in their ability to read and recall information or to recognise and use top-level organisation in their recalls. For the quantity of information recalled, no differences were found in the Pre-test and Post-test 1; a statistically significant difference was found in Post-test 2 in favour of the experimental group. For the quality of information recalled, the control group remembered more top-level idea units in the Pre-test; there was no difference in Post-test 1; the experimental group did better in three out of five levels in Post-test 2. There was no difference in the Pretest in either group's use of the passage's top-level organisation to structure recalls, but the experimental group did better in both post-tests. The control group did better in the Pre-test in recognising the passage's top-level organisation, but the experimental group did better in both post-tests. The null hypotheses were rejected as the experimental training made a difference, although this difference only became apparent three weeks later, and not immediately after the training. The experimental group's nullifying the control group's Pre-test advantage in Post-test 1 and surpassing it in Post-test 2, powerfully supports Bartlett's and Carrell's findings that teaching the strategy did make a difference and that this effect could be maintained over three weeks
- Full Text:
- Date Issued: 1991
An assessment of the effectiveness of the Crossways Farm Village constructed wetland in the treatment of domestic wastewater
- Authors: Silbernagl, Ryan
- Date: 2020
- Subjects: Crossways Farm Village FWS wetland (South Africa)-- Management , Sewage -- Purification -- South Africa , Wetland management -- South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/145011 , vital:38400
- Description: A mass balance study was conducted comparing inflowing and outflowing solute loads in order to calculate the treatment efficiency of a free water surface (FWS) constructed wetland used to treat domestic wastewater following primary treatment in an anaerobic reactor and oxidation in a rotating biological contractor. Water samples were taken at six locations down the length of the treatment system and analysed for nitrate nitrogen (NO3-N), nitrite nitrogen (NO2-N), ammonia nitrogen (NH4-N) and phosphorus as phosphate (PO4-P). Flow was determined using two V notch weirs combined with pressure transducers based on an empirically derived stage-discharge relationship. The concentration of each solute (g.m-3) multiplied by flow (m3.day-1) provides a measurement of the mass of each solute entering and leaving the treatment wetland such that the difference (inflow – outflow) indicates the nett storage in, or loss from, the wetland. In order to determine the water balance, apart from measuring surface inflows and outflows, rainfall was measured using an onsite rain gauge. Evapotranspirational losses were determined using the Penman-Monteith equation based on weather data collected at an onsite weather station. Other than water that entered the wetland via the primary water treatment works, surface inflows could be ignored as the wetland was sealed with a plastic liner, which also prevented groundwater inflow and outflow. Wetland outputs via surface outflow and evapotranspiration were then subtracted from wetland inputs to determine the water balance over the study period. Approximately 10.5% of water inputs into the hydrological mass balance calculation was not accounted for, which is considered to be accounted for by inaccuracy associated with the estimation of evapotranspiration and possibly by differences in water levels in the wetland at the start and end of the experiment. Total input, output and storage of NO3-N, NO2-N, NH4-N and PO4-P was calculated from April 2016 to September 2016 to give the treatment efficiency of the FWS wetland system. Results showed a 91.5% reduction in NO3-N, 76.6% reduction in NH4-N, and 88.8% reduction in PO4P between the inflow and outflow. Wetland sediment and vegetation (Typha capensis) samples were also analysed for nitrogen and phosphorus content to give an estimate of nutrient stocks/storage accumulated in plant tissues and sediments over the lifespan of the wetland. Standing stock calculations showed that a total of 450.1kg of nitrogen is stored in the wetlands, of which 69.3kg is stored in wetland sediments. Wetland phosphorus retention was found to be significantly lower with a total of 57.1kg of phosphorus, of which 77.4% was stored in sediments, indicating that wetland sediments comprise the largest store and therefore removal pathway of nutrients in the Crossways Farm Village FWS wetland.
- Full Text:
- Date Issued: 2020
- Authors: Silbernagl, Ryan
- Date: 2020
- Subjects: Crossways Farm Village FWS wetland (South Africa)-- Management , Sewage -- Purification -- South Africa , Wetland management -- South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/145011 , vital:38400
- Description: A mass balance study was conducted comparing inflowing and outflowing solute loads in order to calculate the treatment efficiency of a free water surface (FWS) constructed wetland used to treat domestic wastewater following primary treatment in an anaerobic reactor and oxidation in a rotating biological contractor. Water samples were taken at six locations down the length of the treatment system and analysed for nitrate nitrogen (NO3-N), nitrite nitrogen (NO2-N), ammonia nitrogen (NH4-N) and phosphorus as phosphate (PO4-P). Flow was determined using two V notch weirs combined with pressure transducers based on an empirically derived stage-discharge relationship. The concentration of each solute (g.m-3) multiplied by flow (m3.day-1) provides a measurement of the mass of each solute entering and leaving the treatment wetland such that the difference (inflow – outflow) indicates the nett storage in, or loss from, the wetland. In order to determine the water balance, apart from measuring surface inflows and outflows, rainfall was measured using an onsite rain gauge. Evapotranspirational losses were determined using the Penman-Monteith equation based on weather data collected at an onsite weather station. Other than water that entered the wetland via the primary water treatment works, surface inflows could be ignored as the wetland was sealed with a plastic liner, which also prevented groundwater inflow and outflow. Wetland outputs via surface outflow and evapotranspiration were then subtracted from wetland inputs to determine the water balance over the study period. Approximately 10.5% of water inputs into the hydrological mass balance calculation was not accounted for, which is considered to be accounted for by inaccuracy associated with the estimation of evapotranspiration and possibly by differences in water levels in the wetland at the start and end of the experiment. Total input, output and storage of NO3-N, NO2-N, NH4-N and PO4-P was calculated from April 2016 to September 2016 to give the treatment efficiency of the FWS wetland system. Results showed a 91.5% reduction in NO3-N, 76.6% reduction in NH4-N, and 88.8% reduction in PO4P between the inflow and outflow. Wetland sediment and vegetation (Typha capensis) samples were also analysed for nitrogen and phosphorus content to give an estimate of nutrient stocks/storage accumulated in plant tissues and sediments over the lifespan of the wetland. Standing stock calculations showed that a total of 450.1kg of nitrogen is stored in the wetlands, of which 69.3kg is stored in wetland sediments. Wetland phosphorus retention was found to be significantly lower with a total of 57.1kg of phosphorus, of which 77.4% was stored in sediments, indicating that wetland sediments comprise the largest store and therefore removal pathway of nutrients in the Crossways Farm Village FWS wetland.
- Full Text:
- Date Issued: 2020
The diets of co-occuring anurans in a small South African river: assessments using stomach contents, stable isotope ratios and fatty acid profiles
- Authors: Sikutshwa, Likho
- Date: 2015
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54405 , vital:26562
- Description: During their life cycle amphibians change their habitat and feeding, and are important consumers in both terrestrial and aquatic habitats. The trophic ecology of anurans has been studied intensively using gut content analysis, but very little work has been done using biochemical techniques such as stable isotope and fatty acid analyses. These biochemical techniques produce data that allow for additional inferences about the trophic ecology of anurans, as they reveal what the organisms assimilated over time rather than what was recently ingested. The investigation of the feeding ecology and trophic interactions of anurans using gut content analyses together with stable isotope and fatty acid analyses will help us to better understand their ecological roles. The objective of this thesis was to assess the feeding ecology of four anurans (Amietia angolensis, Amietophyrnus rangeri, Strongylopus grayii and Xenopus laevis) in a temperate river using a combination of gut content, stable isotope and fatty acid analyses. Frogs, tadpoles and potential food sources were sampled in two sites (upstream and downstream) in the Kowie River, Eastern Cape Province, South Africa. Gut content analyses identified 147 prey items belonging to 12 prey orders in the stomachs of the sampled specimens. In both A. angolensis and S. grayii the most important prey category was Coleoptera, followed by Hemiptera, Diptera and Hymenoptera at both sites. Aquatic prey items (aquatic hemipterans, chirinomids and blackflies) were the most important food sources for X. laevis (Alimentary Index (IAi) = 6.4; 5.2; 4.2). In Am. rangeri, Hymenoptera was the most important prey category (IAi = 8.3). The trophic niche overlap between A. angolensis and S. grayii was biologically significant (> 0.6), and in the remaining species there was no significant trophic niche overlap. Amietia angolensis showed a larger trophic niche (Levin’s measure; B = 7.7 and Bst = 0.84 downstream, and upstream B = 7.6 (Bst = 0.82) compared to the other species. The gut content analyses showed that frogs feed on a variety of prey items that constitutes food sources from both aquatic and terrestrial habitats. Stable isotopes indicated that aquatic derived sources contributed significantly more towards the diets of X. laevis, A. angolensis tadpoles and S. grayii tadpoles compared with the other anurans, whereas aquatic and terrestrial derived food sources contributed equally to the diets of A. angolensis and S. grayii. Increased trophic positions in A. angolensis and S. grayii occurred throughout their development. The four different species had similar fatty acid profiles in the upstream region, and fairly similar δ13C values, suggesting that they probably consumed similar food. Fatty acid profiles of anurans in the downstream region showed distinct separations among the species. Tadpoles had high levels of diatom-associated fatty acids (20:5ω3; A. angolensis tadpole – 8.4 %, S. grayii tadpole – 9.4 % upstream and downstream; 9.1 and 6.1 % total fatty acids (TFA), respectively). All four species had substantial contributions from bacterial fatty acids, and large proportions of saturated fatty acids (30.6 - 50.0 %) including those with 14 and 18 carbons, indicating that bacterial and detritus food sources played an important role in their diets. The fatty acid profiles revealed high proportions of polyunsaturated fatty acids (PUFAs) and essential fatty acids (EFAs) in all species, indicating a good quality of food and that the quality of food consumed was similar among species. The results demonstrated the usefulness of a combination of traditional techniques (gut content techniques) and biochemical techniques (stable isotopes and fatty acid analysis) for assessing consumption and assimilation. The amphibian assemblages examined derived much of their energy from terrestrial and aquatic sources. This information will allow more precise and comprehensive assessments of trophic interactions in freshwater habitats, along with aiding in future amphibian conservation and management efforts.
- Full Text:
- Date Issued: 2015
- Authors: Sikutshwa, Likho
- Date: 2015
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54405 , vital:26562
- Description: During their life cycle amphibians change their habitat and feeding, and are important consumers in both terrestrial and aquatic habitats. The trophic ecology of anurans has been studied intensively using gut content analysis, but very little work has been done using biochemical techniques such as stable isotope and fatty acid analyses. These biochemical techniques produce data that allow for additional inferences about the trophic ecology of anurans, as they reveal what the organisms assimilated over time rather than what was recently ingested. The investigation of the feeding ecology and trophic interactions of anurans using gut content analyses together with stable isotope and fatty acid analyses will help us to better understand their ecological roles. The objective of this thesis was to assess the feeding ecology of four anurans (Amietia angolensis, Amietophyrnus rangeri, Strongylopus grayii and Xenopus laevis) in a temperate river using a combination of gut content, stable isotope and fatty acid analyses. Frogs, tadpoles and potential food sources were sampled in two sites (upstream and downstream) in the Kowie River, Eastern Cape Province, South Africa. Gut content analyses identified 147 prey items belonging to 12 prey orders in the stomachs of the sampled specimens. In both A. angolensis and S. grayii the most important prey category was Coleoptera, followed by Hemiptera, Diptera and Hymenoptera at both sites. Aquatic prey items (aquatic hemipterans, chirinomids and blackflies) were the most important food sources for X. laevis (Alimentary Index (IAi) = 6.4; 5.2; 4.2). In Am. rangeri, Hymenoptera was the most important prey category (IAi = 8.3). The trophic niche overlap between A. angolensis and S. grayii was biologically significant (> 0.6), and in the remaining species there was no significant trophic niche overlap. Amietia angolensis showed a larger trophic niche (Levin’s measure; B = 7.7 and Bst = 0.84 downstream, and upstream B = 7.6 (Bst = 0.82) compared to the other species. The gut content analyses showed that frogs feed on a variety of prey items that constitutes food sources from both aquatic and terrestrial habitats. Stable isotopes indicated that aquatic derived sources contributed significantly more towards the diets of X. laevis, A. angolensis tadpoles and S. grayii tadpoles compared with the other anurans, whereas aquatic and terrestrial derived food sources contributed equally to the diets of A. angolensis and S. grayii. Increased trophic positions in A. angolensis and S. grayii occurred throughout their development. The four different species had similar fatty acid profiles in the upstream region, and fairly similar δ13C values, suggesting that they probably consumed similar food. Fatty acid profiles of anurans in the downstream region showed distinct separations among the species. Tadpoles had high levels of diatom-associated fatty acids (20:5ω3; A. angolensis tadpole – 8.4 %, S. grayii tadpole – 9.4 % upstream and downstream; 9.1 and 6.1 % total fatty acids (TFA), respectively). All four species had substantial contributions from bacterial fatty acids, and large proportions of saturated fatty acids (30.6 - 50.0 %) including those with 14 and 18 carbons, indicating that bacterial and detritus food sources played an important role in their diets. The fatty acid profiles revealed high proportions of polyunsaturated fatty acids (PUFAs) and essential fatty acids (EFAs) in all species, indicating a good quality of food and that the quality of food consumed was similar among species. The results demonstrated the usefulness of a combination of traditional techniques (gut content techniques) and biochemical techniques (stable isotopes and fatty acid analysis) for assessing consumption and assimilation. The amphibian assemblages examined derived much of their energy from terrestrial and aquatic sources. This information will allow more precise and comprehensive assessments of trophic interactions in freshwater habitats, along with aiding in future amphibian conservation and management efforts.
- Full Text:
- Date Issued: 2015
Kwelo lizwe leentsomi : iintsomi zesiXhosa
- Authors: Sigcau, Bulelwa Monica
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , Xhosa fiction -- 21st century , Diaries -- Authorship , Short stories, Xhosa -- 21st century , African fiction -- History and criticism , English fiction -- History and criticism
- Language: Xhosa
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178270 , vital:42926
- Description: Ukuphosa kuvimba wolwazi ngeentsomi zesiXhosa, le thisisi iqulathe iintsomi-mabali eziqanjwe zabaliswa kusetyenziswa ulwimi, umxholo nemixholo engenelelayo engeziganeko zemihla ngemihla, abalinganiswa, isakhiwo sentsomi nesimo sentlalo zala maxesha siphila kuwo. Ezi ntsomi zixhaswa kakhulu yimifanekiso ephilayo, ukusetyenziswa kwemigca emifutshane ezoba isimo sentlalo nevakala ingathi yimibongo ngenxa yokuqupha kwayo. Umsebenzi kaR.F. Mcimeli, kwincwadi ethi, Ingqaka kaMaqhudeni iqulethe iintsomi ezisondeleyo kwezi ziqanjwe kulo msebenzi, ngakumbi iintsomi ezizezi, uNomvula noNomvulazana, uDumisani nesigebenga esingabonwayo, uNomaciko noCikokazi, nezinye. Umsebenzi kaNongenile Masithathu Zenani (2006) oqokelelwe nguHarold Scheub kwincwadi ethi South African voices: A long time passed ube negaleloo elikhulu ukubonisa indima esele idlaliwe kwiintsomi zesiXhosa. UKholeka Sigenu (2002) kwincwandi ethi Ezakowethu naye ube nefuthe kwindlela ezi ntsomi eziqanjwe ngayo nokuqinisekisa ukuba ngenene zongeza ulwazi olutsha. Ezi ntsomi-mabali zibhentsise okulungileyo nokuhenxayo ngaphandle kokushumayela nokuveza abalinganiswa njengeengilosi. Ndiluthande kakhulu nohlobo lukaAmos Tutuola lokubhala, ndizame ukusondeza uhlobo lwam lokubhala kolu hlobo lukaAmos Tutuola. Ndilandele ifuthe lohlobo lokubhala olubizwa ngeflash fiction. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Sigcau, Bulelwa Monica
- Date: 2021-04
- Subjects: Creative writing (Higher education) -- South Africa , Xhosa fiction -- 21st century , Diaries -- Authorship , Short stories, Xhosa -- 21st century , African fiction -- History and criticism , English fiction -- History and criticism
- Language: Xhosa
- Type: thesis , text , Masters , MA
- Identifier: http://hdl.handle.net/10962/178270 , vital:42926
- Description: Ukuphosa kuvimba wolwazi ngeentsomi zesiXhosa, le thisisi iqulathe iintsomi-mabali eziqanjwe zabaliswa kusetyenziswa ulwimi, umxholo nemixholo engenelelayo engeziganeko zemihla ngemihla, abalinganiswa, isakhiwo sentsomi nesimo sentlalo zala maxesha siphila kuwo. Ezi ntsomi zixhaswa kakhulu yimifanekiso ephilayo, ukusetyenziswa kwemigca emifutshane ezoba isimo sentlalo nevakala ingathi yimibongo ngenxa yokuqupha kwayo. Umsebenzi kaR.F. Mcimeli, kwincwadi ethi, Ingqaka kaMaqhudeni iqulethe iintsomi ezisondeleyo kwezi ziqanjwe kulo msebenzi, ngakumbi iintsomi ezizezi, uNomvula noNomvulazana, uDumisani nesigebenga esingabonwayo, uNomaciko noCikokazi, nezinye. Umsebenzi kaNongenile Masithathu Zenani (2006) oqokelelwe nguHarold Scheub kwincwadi ethi South African voices: A long time passed ube negaleloo elikhulu ukubonisa indima esele idlaliwe kwiintsomi zesiXhosa. UKholeka Sigenu (2002) kwincwandi ethi Ezakowethu naye ube nefuthe kwindlela ezi ntsomi eziqanjwe ngayo nokuqinisekisa ukuba ngenene zongeza ulwazi olutsha. Ezi ntsomi-mabali zibhentsise okulungileyo nokuhenxayo ngaphandle kokushumayela nokuveza abalinganiswa njengeengilosi. Ndiluthande kakhulu nohlobo lukaAmos Tutuola lokubhala, ndizame ukusondeza uhlobo lwam lokubhala kolu hlobo lukaAmos Tutuola. Ndilandele ifuthe lohlobo lokubhala olubizwa ngeflash fiction. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
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- Date Issued: 2021-04
Generalized linear models, with applications in fisheries research
- Authors: Sidumo, Bonelwa
- Date: 2018
- Subjects: Western mosquitofish , Analysis of variance , Fisheries Catch effort South Africa Sundays River (Eastern Cape) , Linear models (Statistics) , Multilevel models (Statistics) , Experimental design
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/61102 , vital:27975
- Description: Gambusia affinis (G. affinis) is an invasive fish species found in the Sundays River Valley of the Eastern Cape, South Africa, The relative abundance and population dynamics of G. affinis were quantified in five interconnected impoundments within the Sundays River Valley, This study utilised a G. affinis data set to demonstrate various, classical ANOVA models. Generalized linear models were used to standardize catch per unit effort (CPUE) estimates and to determine environmental variables which influenced the CPUE, Based on the generalized linear model results dam age, mean temperature, Oreochromis mossambicus abundance and Glossogobius callidus abundance had a significant effect on the G. affinis CPUE. The Albany Angling Association collected data during fishing tag and release events. These data were utilized to demonstrate repeated measures designs. Mixed-effects models provided a powerful and flexible tool for analyzing clustered data such as repeated measures data and nested data, lienee it has become tremendously popular as a framework for the analysis of bio-behavioral experiments. The results show that the mixed-effects methods proposed in this study are more efficient than those based on generalized linear models. These data were better modeled with mixed-effects models due to their flexibility in handling missing data.
- Full Text:
- Date Issued: 2018
- Authors: Sidumo, Bonelwa
- Date: 2018
- Subjects: Western mosquitofish , Analysis of variance , Fisheries Catch effort South Africa Sundays River (Eastern Cape) , Linear models (Statistics) , Multilevel models (Statistics) , Experimental design
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/61102 , vital:27975
- Description: Gambusia affinis (G. affinis) is an invasive fish species found in the Sundays River Valley of the Eastern Cape, South Africa, The relative abundance and population dynamics of G. affinis were quantified in five interconnected impoundments within the Sundays River Valley, This study utilised a G. affinis data set to demonstrate various, classical ANOVA models. Generalized linear models were used to standardize catch per unit effort (CPUE) estimates and to determine environmental variables which influenced the CPUE, Based on the generalized linear model results dam age, mean temperature, Oreochromis mossambicus abundance and Glossogobius callidus abundance had a significant effect on the G. affinis CPUE. The Albany Angling Association collected data during fishing tag and release events. These data were utilized to demonstrate repeated measures designs. Mixed-effects models provided a powerful and flexible tool for analyzing clustered data such as repeated measures data and nested data, lienee it has become tremendously popular as a framework for the analysis of bio-behavioral experiments. The results show that the mixed-effects methods proposed in this study are more efficient than those based on generalized linear models. These data were better modeled with mixed-effects models due to their flexibility in handling missing data.
- Full Text:
- Date Issued: 2018
Anisotropic copper oxide nanorods decorated with gold and palladium nanoparticles and their enzymatic properties
- Authors: Sicwetsha, Simbongile
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/178547 , vital:42949
- Description: Access restricted until April 2023. , Thesis (MSc) -- Faculty of Science, Chemistry, 2021
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- Date Issued: 2021-04
- Authors: Sicwetsha, Simbongile
- Date: 2021-04
- Subjects: To be added
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/178547 , vital:42949
- Description: Access restricted until April 2023. , Thesis (MSc) -- Faculty of Science, Chemistry, 2021
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- Date Issued: 2021-04
Observations of diffuse radio emission in the Abell 773 galaxy cluster
- Authors: Sichone, Gift L
- Date: 2020
- Subjects: Galaxies -- Clusters -- Observations , Radio astronomy -- Observations , Astrophysics -- South Africa , Westerbork Radio Telescope , A773 galaxy cluster , Astronomy -- Observations , Radio sources (Astronomy
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/144945 , vital:38394
- Description: In this thesis, we present 18 and 21 cm observations of the A773 galaxy cluster observed with the Westerbork radio telescope. The final 18 and 21 cm images achieve a noise level of 0.018 mJy beam‾ 1 and 0.025 mJy beam-1 respectively. After subtracting the compact sources, the low resolution images show evidence of a radio halo at 18 cm, whereas its presence is more uncertain in the low resolution 21 cm images due the presence of residual sidelobes from bright sources. In the joint analysis of both frequencies, the radio halo has a 5.37 arcmin2 area with a 6.76 mJy flux density. Further observations and analysis are, however, required to fully characterize its properties.
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- Date Issued: 2020
- Authors: Sichone, Gift L
- Date: 2020
- Subjects: Galaxies -- Clusters -- Observations , Radio astronomy -- Observations , Astrophysics -- South Africa , Westerbork Radio Telescope , A773 galaxy cluster , Astronomy -- Observations , Radio sources (Astronomy
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/144945 , vital:38394
- Description: In this thesis, we present 18 and 21 cm observations of the A773 galaxy cluster observed with the Westerbork radio telescope. The final 18 and 21 cm images achieve a noise level of 0.018 mJy beam‾ 1 and 0.025 mJy beam-1 respectively. After subtracting the compact sources, the low resolution images show evidence of a radio halo at 18 cm, whereas its presence is more uncertain in the low resolution 21 cm images due the presence of residual sidelobes from bright sources. In the joint analysis of both frequencies, the radio halo has a 5.37 arcmin2 area with a 6.76 mJy flux density. Further observations and analysis are, however, required to fully characterize its properties.
- Full Text:
- Date Issued: 2020