Rural teachers’ experiences during covid-19 pandemic: lessons learnt to cope with future emergencies
- Authors: Dlambewu, Amanda
- Date: 2024-04
- Subjects: COVID-19 (Disease) -- Social aspects -- South Africa , Rural schools -- South Africa , Teachers -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63945 , vital:73629
- Description: This study focused on challenges faced by rural teachers during the COVID-19 pandemic, with the intention of using the outcomes to develop a framework that could assist with coping with similar challenges in future emergencies. The study was situated in the interpretivist paradigm. A qualitative approach was employed using interviews and a focus group discussion. Bronfenbrenner’s ecological theory and the theory of rurality were used as lenses to explore and interpret the challenges that rural teachers experienced during the COVID-19 pandemic. The study's findings reveal that teachers faced the following challenges: mental health, adaptability, impact on personal life, safety, and work environment challenges. Furthermore, the study also found that teachers used the following coping mechanisms to deal with the challenges during the pandemic: adherence to rules and regulations, pastoral services, support from friends and family, collaboration, and physical activity. Finally, after applying both the theory of rurality and Bronfenbrenner's ecological theory to the findings, a framework was developed to assist in coping with future emergencies. , Thesis (MEd) -- Faculty of Education, Post Graduate Education, 2024
- Full Text:
- Date Issued: 2024-04
Rural teachers’ experiences during covid-19 pandemic: lessons learnt to cope with future emergencies
- Authors: Dlambewu, Amanda
- Date: 2024-04
- Subjects: COVID-19 (Disease) -- Social aspects -- South Africa , Rural schools -- South Africa , Teachers -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63945 , vital:73629
- Description: This study focused on challenges faced by rural teachers during the COVID-19 pandemic, with the intention of using the outcomes to develop a framework that could assist with coping with similar challenges in future emergencies. The study was situated in the interpretivist paradigm. A qualitative approach was employed using interviews and a focus group discussion. Bronfenbrenner’s ecological theory and the theory of rurality were used as lenses to explore and interpret the challenges that rural teachers experienced during the COVID-19 pandemic. The study's findings reveal that teachers faced the following challenges: mental health, adaptability, impact on personal life, safety, and work environment challenges. Furthermore, the study also found that teachers used the following coping mechanisms to deal with the challenges during the pandemic: adherence to rules and regulations, pastoral services, support from friends and family, collaboration, and physical activity. Finally, after applying both the theory of rurality and Bronfenbrenner's ecological theory to the findings, a framework was developed to assist in coping with future emergencies. , Thesis (MEd) -- Faculty of Education, Post Graduate Education, 2024
- Full Text:
- Date Issued: 2024-04
Seagrasses in Mozambique: distribution, people’s perceptions and restoration best practice
- Mabuto, Manuela Elisa Manuel Amone, Hollander, Johan
- Authors: Mabuto, Manuela Elisa Manuel Amone , Hollander, Johan
- Date: 2024-04
- Subjects: Seagrasses -- Mozambique , Seagrasses -- Southern Hemisphere , Coastal zone management -- Mozambique , Restoration ecology -- Mozambique
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/64126 , vital:73655
- Description: This thesis investigated the restoration of seagrass meadows and their associated biodiversity thus contributing to their conservation and to people's well-being. A mixed methods approach was used, and results presented in five chapters. Chapter I is a general introduction to the study outlining relevant information, research objectives and hypotheses. Chapter II investigates coastal community’s perceptions on the role of seagrass ecosystems, local impacts of coastal erosion and the need for seagrass restoration in Mozambique. It showed that there is a high awareness of the studied communities to seagrass importance for their livelihoods. Communities supported restoration and identified community engagement as a fundamental component for a successful implementation of restoration projects in their area. Chapter III conducted a mapping inventory for seagrass using open access data sources and investigated change detection in seagrass extent in southern Mozambique using Satellite imagery. In addition, Unmanned Aerial Vehicles (drones) were used to map seagrass to the species level at Inhaca Island. The results showed that seagrass habitats have been losing extent in recent years mainly in Bairro dos Pescadores at northwest Maputo Bay, due to sedimentation from flooding and inappropriate gleaning / clam collection practices. Around Inhaca Island seagrass extent has changed in response to natural causes and from anthropogenic disturbance near the main village and port area. For the first time for this area drones were used to rapidly and effectively acquire high- resolution data for detailed seagrass mapping and monitoring. The different mapping approaches were critically analyzed, and a way forward discussed. In Chapter IV, two different field experiments were conducted simultaneously. One, mimicked disturbance of meadows in terms of digging to collect clams, a common practice in northeastern Maputo Bay to assess the time of natural recovery and another replanted Zostera capensis using different plug sizes. The results indicated that once anthropogenic impacts are ceased, Z. capensis meadows are restored 12 months after impact exclusion. There was a 75% survival rate for the mechanical plug restoration approach; positive implications for seagrass transplantation projects that are both time consuming and financially costly. It was clear from the study that a combination of both impact exclusion and active restoration is needed for seagrass survival. Chapter V investigated the influence of seagrass restoration on the abundance and diversity of macroinvertebrates. After two years of observations, replanted seagrass areas had not recovered compared to natural established seagrass beds. However, a strong linear relationship existed between the abundance of seagrasses and the quantity of associated macrofauna species. Chapter VI provided recommendations on better ways to perform seagrass restoration and management. The main findings of this thesis provide new knowledge on the mapping of seagrass on a local to a regional scale as well as on better restoration practice of the seagrass Zostera capensis, an IUCN Red List vulnerable species. Communities’ perceptions on seagrass were investigated contributing to an understanding of the socio-ecological conservation and management of these critical and yet threatened ecosystems. , Thesis (PhD) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Mabuto, Manuela Elisa Manuel Amone , Hollander, Johan
- Date: 2024-04
- Subjects: Seagrasses -- Mozambique , Seagrasses -- Southern Hemisphere , Coastal zone management -- Mozambique , Restoration ecology -- Mozambique
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/64126 , vital:73655
- Description: This thesis investigated the restoration of seagrass meadows and their associated biodiversity thus contributing to their conservation and to people's well-being. A mixed methods approach was used, and results presented in five chapters. Chapter I is a general introduction to the study outlining relevant information, research objectives and hypotheses. Chapter II investigates coastal community’s perceptions on the role of seagrass ecosystems, local impacts of coastal erosion and the need for seagrass restoration in Mozambique. It showed that there is a high awareness of the studied communities to seagrass importance for their livelihoods. Communities supported restoration and identified community engagement as a fundamental component for a successful implementation of restoration projects in their area. Chapter III conducted a mapping inventory for seagrass using open access data sources and investigated change detection in seagrass extent in southern Mozambique using Satellite imagery. In addition, Unmanned Aerial Vehicles (drones) were used to map seagrass to the species level at Inhaca Island. The results showed that seagrass habitats have been losing extent in recent years mainly in Bairro dos Pescadores at northwest Maputo Bay, due to sedimentation from flooding and inappropriate gleaning / clam collection practices. Around Inhaca Island seagrass extent has changed in response to natural causes and from anthropogenic disturbance near the main village and port area. For the first time for this area drones were used to rapidly and effectively acquire high- resolution data for detailed seagrass mapping and monitoring. The different mapping approaches were critically analyzed, and a way forward discussed. In Chapter IV, two different field experiments were conducted simultaneously. One, mimicked disturbance of meadows in terms of digging to collect clams, a common practice in northeastern Maputo Bay to assess the time of natural recovery and another replanted Zostera capensis using different plug sizes. The results indicated that once anthropogenic impacts are ceased, Z. capensis meadows are restored 12 months after impact exclusion. There was a 75% survival rate for the mechanical plug restoration approach; positive implications for seagrass transplantation projects that are both time consuming and financially costly. It was clear from the study that a combination of both impact exclusion and active restoration is needed for seagrass survival. Chapter V investigated the influence of seagrass restoration on the abundance and diversity of macroinvertebrates. After two years of observations, replanted seagrass areas had not recovered compared to natural established seagrass beds. However, a strong linear relationship existed between the abundance of seagrasses and the quantity of associated macrofauna species. Chapter VI provided recommendations on better ways to perform seagrass restoration and management. The main findings of this thesis provide new knowledge on the mapping of seagrass on a local to a regional scale as well as on better restoration practice of the seagrass Zostera capensis, an IUCN Red List vulnerable species. Communities’ perceptions on seagrass were investigated contributing to an understanding of the socio-ecological conservation and management of these critical and yet threatened ecosystems. , Thesis (PhD) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
Self-attentive vision in evolutionary robotics
- Authors: Botha, Bouwer
- Date: 2024-04
- Subjects: Evolutionary robotics , Robotics , Neural networks (Computer science)
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63628 , vital:73566
- Description: The autonomy of a robot refers to its ability to achieve a task in an environment with minimal human supervision. This may require autonomous solutions to be able to perceive their environment to inform their decisions. An inexpensive and highly informative way that robots can perceive the environment is through vision. The autonomy of a robot is reliant on the quality of the robotic controller. These controllers are the software interface between the robot and environment that determine the actions of the robot based on the perceived environment. Controllers are typically created using manual programming techniques, which become progressively more challenging with increasing complexity of both the robot and task. An alternative to manual programming is the use of machine learning techniques such as those used by Evolutionary Robotics (ER). ER is an area of research that investigates the automatic creation of controllers. Instead of manually programming a controller, an Evolutionary Algorithms can be used to evolve the controller through repeated interactions with the task environment. Employing the ER approach on camera-based controllers, however, has presented problems for conventional ER methods. Firstly, existing architectures that are capable of automatically processing images, have a large number of trained parameters. These architectures over-encumber the evolutionary process due to the large search space of possible configurations. Secondly, the evolution of complex controllers needs to be done in simulation, which requires either: (a) the construction of a photo-realistic virtual environment with accurate lighting, texturing and models or (b) potential reduction of the controller capability by simplifying the problem via image preprocessing. Any controller trained in simulation also raises the inherent concern of not being able to transfer to the real world. This study proposes a new technique for the evolution of camera-based controllers in ER, that aims to address the highlighted problems. The use of self-attention is proposed to facilitate the evolution of compact controllers that are able to evolve specialized sets of task-relevant features in unprocessed images by focussing on important image regions. Furthermore, a new neural network-based simulation approach, Generative Neuro-Augmented Vision (GNAV), is proposed to simplify simulation construction. GNAV makes use of random data collected in a simple virtual environment and the real world. A neural network is trained to overcome the visual discrepancies between these two environments. GNAV enables a controller to be trained in a simple simulated environment that appears similar to the real environment, while requiring minimal human supervision. The capabilities of the new technique were demonstrated using a series of real-world navigation tasks based on camera vision. Controllers utilizing the proposed self-attention mechanism were trained using GNAV and transferred to a real camera-equipped robot. The controllers were shown to be able to perform the same tasks in the real world. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Botha, Bouwer
- Date: 2024-04
- Subjects: Evolutionary robotics , Robotics , Neural networks (Computer science)
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63628 , vital:73566
- Description: The autonomy of a robot refers to its ability to achieve a task in an environment with minimal human supervision. This may require autonomous solutions to be able to perceive their environment to inform their decisions. An inexpensive and highly informative way that robots can perceive the environment is through vision. The autonomy of a robot is reliant on the quality of the robotic controller. These controllers are the software interface between the robot and environment that determine the actions of the robot based on the perceived environment. Controllers are typically created using manual programming techniques, which become progressively more challenging with increasing complexity of both the robot and task. An alternative to manual programming is the use of machine learning techniques such as those used by Evolutionary Robotics (ER). ER is an area of research that investigates the automatic creation of controllers. Instead of manually programming a controller, an Evolutionary Algorithms can be used to evolve the controller through repeated interactions with the task environment. Employing the ER approach on camera-based controllers, however, has presented problems for conventional ER methods. Firstly, existing architectures that are capable of automatically processing images, have a large number of trained parameters. These architectures over-encumber the evolutionary process due to the large search space of possible configurations. Secondly, the evolution of complex controllers needs to be done in simulation, which requires either: (a) the construction of a photo-realistic virtual environment with accurate lighting, texturing and models or (b) potential reduction of the controller capability by simplifying the problem via image preprocessing. Any controller trained in simulation also raises the inherent concern of not being able to transfer to the real world. This study proposes a new technique for the evolution of camera-based controllers in ER, that aims to address the highlighted problems. The use of self-attention is proposed to facilitate the evolution of compact controllers that are able to evolve specialized sets of task-relevant features in unprocessed images by focussing on important image regions. Furthermore, a new neural network-based simulation approach, Generative Neuro-Augmented Vision (GNAV), is proposed to simplify simulation construction. GNAV makes use of random data collected in a simple virtual environment and the real world. A neural network is trained to overcome the visual discrepancies between these two environments. GNAV enables a controller to be trained in a simple simulated environment that appears similar to the real environment, while requiring minimal human supervision. The capabilities of the new technique were demonstrated using a series of real-world navigation tasks based on camera vision. Controllers utilizing the proposed self-attention mechanism were trained using GNAV and transferred to a real camera-equipped robot. The controllers were shown to be able to perform the same tasks in the real world. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2024
- Full Text:
- Date Issued: 2024-04
South Africa’s regulation of mineral mining activities in the area: lessons from the United Kingdom
- Authors: Karomo, Adelaide Aquiline
- Date: 2024-04
- Subjects: Mineral mining activities , Mining law , Deep Sea mining Act
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/64411 , vital:73700
- Description: As they anticipate the benefits associated with mining polymetallic nodules, polymetallic sulphides and ferromanganese crusts, several States are currently exploring or sponsoring State-owned enterprises and private persons to explore for these mineral resources in the seabed, ocean floor and subsoil beyond national jurisdiction (the Area). However, Africa remains the only region that is not actively participating. To guide South Africa in developing a deep seabed mining regime the thesis begins by identifying the international law regulating the Area and the activities therein. Since the mineral resources in the Area have been declared the common heritage of mankind, this principle as regulated by Part XI of the United Nations Convention on the Law of the Sea (UNCLOS), and modified by the Agreement relating to the implementation of Part XI of the United Nations Convention on the Law of the Sea of 10 December 1982 forms an essential component of this study. As such, the thesis determines, amongst others, the requirements for participating in mining activities in the Area (as set out in Part XI of UNCLOS) and establishes that developing a legislative framework is crucial to exempt UNCLOS States parties from liability associated with the damage caused by sponsored activities. Based on the obligations in international law, the thesis zooms in on three aspects concerning the regulation of the activities in the Area: (i) mining concessions, (ii) the relevant payment system, and (iii) environmental protection measures. In terms of these aspects, how the United Kingdom’s deep seabed mining regime regulates activities in the Area is examined. For this assessment, the thesis pays particular attention to the Deep Sea Mining Act and the domestic licences granted to UK Seabed Resources Ltd (UKSRL). In identifying lessons for South Africa, the thesis assesses the extent to which the United Kingdom’s regime complies with the international law framework and highlights the inconsistencies and legislative gaps. Thereafter, the thesis examines the South African legislative instruments regulating mining activities at sea, such as the Mineral and Petroleum Resources Development Act and the National Environmental Management Act, to determine whether their scope should be amended to regulate mining activities in the Area. As per the observations from international law and the lessons learnt from the United Kingdom's regulatory framework, the thesis argues that South Africa’s current mining framework should not be amended; separate deep seabed mining-specific legislation must be adopted. The thesis concludes by setting out the recommendations for developing such legislation. , Thesis (LLD) -- Faculty of Law, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Karomo, Adelaide Aquiline
- Date: 2024-04
- Subjects: Mineral mining activities , Mining law , Deep Sea mining Act
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/64411 , vital:73700
- Description: As they anticipate the benefits associated with mining polymetallic nodules, polymetallic sulphides and ferromanganese crusts, several States are currently exploring or sponsoring State-owned enterprises and private persons to explore for these mineral resources in the seabed, ocean floor and subsoil beyond national jurisdiction (the Area). However, Africa remains the only region that is not actively participating. To guide South Africa in developing a deep seabed mining regime the thesis begins by identifying the international law regulating the Area and the activities therein. Since the mineral resources in the Area have been declared the common heritage of mankind, this principle as regulated by Part XI of the United Nations Convention on the Law of the Sea (UNCLOS), and modified by the Agreement relating to the implementation of Part XI of the United Nations Convention on the Law of the Sea of 10 December 1982 forms an essential component of this study. As such, the thesis determines, amongst others, the requirements for participating in mining activities in the Area (as set out in Part XI of UNCLOS) and establishes that developing a legislative framework is crucial to exempt UNCLOS States parties from liability associated with the damage caused by sponsored activities. Based on the obligations in international law, the thesis zooms in on three aspects concerning the regulation of the activities in the Area: (i) mining concessions, (ii) the relevant payment system, and (iii) environmental protection measures. In terms of these aspects, how the United Kingdom’s deep seabed mining regime regulates activities in the Area is examined. For this assessment, the thesis pays particular attention to the Deep Sea Mining Act and the domestic licences granted to UK Seabed Resources Ltd (UKSRL). In identifying lessons for South Africa, the thesis assesses the extent to which the United Kingdom’s regime complies with the international law framework and highlights the inconsistencies and legislative gaps. Thereafter, the thesis examines the South African legislative instruments regulating mining activities at sea, such as the Mineral and Petroleum Resources Development Act and the National Environmental Management Act, to determine whether their scope should be amended to regulate mining activities in the Area. As per the observations from international law and the lessons learnt from the United Kingdom's regulatory framework, the thesis argues that South Africa’s current mining framework should not be amended; separate deep seabed mining-specific legislation must be adopted. The thesis concludes by setting out the recommendations for developing such legislation. , Thesis (LLD) -- Faculty of Law, 2024
- Full Text:
- Date Issued: 2024-04
Spatiotemporal recharge determination in response to episodic rainfall events within the Central Karoo, South Africa
- Authors: Williams, Aarifah
- Date: 2024-04
- Subjects: Groundwater -- South Africa -- Beaufort West , Groundwater recharge , Hydrogeology
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64459 , vital:73735
- Description: With inadequate and unpredictable rainfall patterns resulting in a mean annual precipitation of 464 mm, South Africa is classified as a water-stressed semi-arid country. Consequently, between 2015 and 2021, the majority of South Africa was confronted with severe drought conditions, with numerous dams running dry across the country. The Beaufort West Municipality is a prime example of the adverse effects of South Africa's inadequate and erratic rainfall patterns. In Beaufort West, a town located within the Central Karoo region of the Western Cape, groundwater is the primary source of water. Since recharge within the region is episodic, occurring irregularly, understanding the dynamics surrounding recharge in the area is essential for achieving sustainable long-term water resource management. This study aimed to gain a better understanding of how the aquifers within the Beaufort West Municipality Well Fields respond to extended periods of drought, extreme episodic precipitation events and excessive abstraction. This study aimed to quantify extreme recharge in the Beaufort West municipal wellfields using the water-table fluctuation (WTF) method. Additionally, it sought to deepen comprehension of the local climate's interaction with groundwater levels, surface water dynamics, and recharge through a 32-year historical data analysis (1990 to 2022) encompassing precipitation, evaporation, and surface water parameters. Findings revealed the complex relationship between precipitation, evaporation, regional geology, and water abstraction, influencing recharge periods, duration, and mechanisms across different regions within the aquifer system. Groundwater levels exhibited rapid declines during droughts due to extensive well field abstraction, but recovery was evident following episodic high precipitation events in 1993, 1996, 2010/2011, and 2019/2020. This comprehensive analysis serves as a valuable foundation for informed water resource management strategies, emphasizing the need for diversified approaches ensure the long-term water security and resilience of the Beaufort West Municipality. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Williams, Aarifah
- Date: 2024-04
- Subjects: Groundwater -- South Africa -- Beaufort West , Groundwater recharge , Hydrogeology
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64459 , vital:73735
- Description: With inadequate and unpredictable rainfall patterns resulting in a mean annual precipitation of 464 mm, South Africa is classified as a water-stressed semi-arid country. Consequently, between 2015 and 2021, the majority of South Africa was confronted with severe drought conditions, with numerous dams running dry across the country. The Beaufort West Municipality is a prime example of the adverse effects of South Africa's inadequate and erratic rainfall patterns. In Beaufort West, a town located within the Central Karoo region of the Western Cape, groundwater is the primary source of water. Since recharge within the region is episodic, occurring irregularly, understanding the dynamics surrounding recharge in the area is essential for achieving sustainable long-term water resource management. This study aimed to gain a better understanding of how the aquifers within the Beaufort West Municipality Well Fields respond to extended periods of drought, extreme episodic precipitation events and excessive abstraction. This study aimed to quantify extreme recharge in the Beaufort West municipal wellfields using the water-table fluctuation (WTF) method. Additionally, it sought to deepen comprehension of the local climate's interaction with groundwater levels, surface water dynamics, and recharge through a 32-year historical data analysis (1990 to 2022) encompassing precipitation, evaporation, and surface water parameters. Findings revealed the complex relationship between precipitation, evaporation, regional geology, and water abstraction, influencing recharge periods, duration, and mechanisms across different regions within the aquifer system. Groundwater levels exhibited rapid declines during droughts due to extensive well field abstraction, but recovery was evident following episodic high precipitation events in 1993, 1996, 2010/2011, and 2019/2020. This comprehensive analysis serves as a valuable foundation for informed water resource management strategies, emphasizing the need for diversified approaches ensure the long-term water security and resilience of the Beaufort West Municipality. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
Statistical learning methods for photovoltaic energy output prediction
- Authors: Magaya, Aphiwe
- Date: 2024-04
- Subjects: Photovoltaic power generation , Mathematical statistics , Statistics
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64138 , vital:73656
- Description: Predicting solar energy accurately is important for the integration of more renewable energy into the grid, which can help to alleviate the energy demand on traditional coal-powered sources in South Africa. This study aims to assess several statistical learning models to predict the energy output of a 1MW photovoltaic system installed on the Nelson Mandela University South Campus in Gqeberha. Weather data (including temperature, wind speed, wind direction, precipitation, air pressure, and humidity) and solar irradiance data (including global horizontal radiation, diffuse radiation, and direct radiation) are used to predict the energy output of this system using Artificial Neural Networks (ANN), Support Vector Machines (SVM), Multiple Linear Regression (MLR), and Regression Trees (RT). The performance of each of the models was compared and the results indicated that the ANN model performed best. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Magaya, Aphiwe
- Date: 2024-04
- Subjects: Photovoltaic power generation , Mathematical statistics , Statistics
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64138 , vital:73656
- Description: Predicting solar energy accurately is important for the integration of more renewable energy into the grid, which can help to alleviate the energy demand on traditional coal-powered sources in South Africa. This study aims to assess several statistical learning models to predict the energy output of a 1MW photovoltaic system installed on the Nelson Mandela University South Campus in Gqeberha. Weather data (including temperature, wind speed, wind direction, precipitation, air pressure, and humidity) and solar irradiance data (including global horizontal radiation, diffuse radiation, and direct radiation) are used to predict the energy output of this system using Artificial Neural Networks (ANN), Support Vector Machines (SVM), Multiple Linear Regression (MLR), and Regression Trees (RT). The performance of each of the models was compared and the results indicated that the ANN model performed best. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2024
- Full Text:
- Date Issued: 2024-04
Synthesis and applications of hydroxyl-functionalized chemosensors for selective detection of ions in aqueous systems
- Authors: Hamukoshi, Simeon Shiweda
- Date: 2024-04
- Subjects: Molecular recognition , Solution (Chemistry) , Water chemistry
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63787 , vital:73613
- Description: Fluorescent molecular chemosensors are crucial tools for monitoring toxic metal ions and environmental compounds that pose risks to both humans and wildlife. Continuous sensing is essential for early detection, and chemosensors offer a sensitive and straightforward approach by detecting challenging analyte’s through optical absorption and fluorescence. Current detection methods, such as flame photometry and mass spectrometry, can be expensive, destructive, and impractical for continuous monitoring. Consequently, fluorescent-based methods present a promising, simple, and highly sensitive alternative for chemical recognition and monitoring. In this project, we successfully synthesized ten highly selective small hydroxyl containing molecule fluorescent and colorimetric sensors; Oxime Dye (OD), Small Sensor 1 (SS1), Small Sensor 2 (SS2), Quinoline Dye 1 (QD1), Quinoline Dye 2 (QD2), Quinoline Dye 3 (QD3), Coumarin Dye 1 (CD1), Coumarin Dye 2 (CD2), Naphthalene Dye 1 (ND1), Naphthalene Dye 2 (ND2). These chemosensors contained benzothiazole, naphthalene, quinoline, and coumarin fluorophores. These sensors facilitate both quantitative and qualitative assessment of cationic and anionic species in aqueous organic media. The chemosensors were synthesized using modified Schiff base, azo dye, and oxime-based reactions, enhancing binding and selectivity with analyte’s. They exhibited selectivity towards various metal ions (Cu2+, Fe2+, Ni2+, and Hg2+) and anions (hydroxyl and cyanate), characterized by distinct absorption bands and significant fluorescent quenching and enhancement. While some sensors were selective towards both cations and anions, others exclusively targeted cations, showing lower selectivity or sensitivity towards anions upon further testing. Conversely, certain sensors were selective towards anions, demonstrating reduced sensitivity or selectivity towards the tested cations. The oxime-based chemosensor, OD, was obtained through an oxime-based reaction. The sensor demonstrates remarkable selectivity for Cu2+ and cyanate ions. During titration experiments, the interaction of Cu2+ with OD resulted in a noticeable fluorescence quenching effect, while the presence of OCN ions led to fluorescence enhancement. These distinct behaviors strongly suggest the formation of specific 1:1 complexes between OD and Cu2+ or OCN ions, a conclusion supported by detailed analysis using the Jobs plot technique. In addition to the fluorescence studies, investigations into the influence of pH on the sensor OD, as well as its complexes with Cu2+ and OCN, were conducted to determine the optimum pH conditions for their operation. Moreover, reversible behavior of the complexes was explored in the presence of EDTA, revealing that only the OD-OCN complex displayed reversibility. Furthermore, molecular modeling studies were performed to validate the binding units and calculate the energy differences between the sensor and its respective complexes. Additionally, four chemosensors (SS1, SS2, CD2, and QD2) were synthesized and characterized using Schiff-based reactions, showcasing their unique absorption behaviors. SS1 and SS2, characterized by benzothiazole fluorophores, demonstrated high sensitivity to hydroxyl anions. Jobs plot studies revealed a stable 1:1 binding stoichiometry. Chemosensor CD2, incorporating a coumarin fluorophore, was structurally confirmed but showed no significant spectral changes when screened with various ions. Chemosensor QD2 exhibited remarkable selectivity for Fe2+ ions, and stable 1:1 complexes were confirmed. Further molecular modeling studies were conducted to identify potential binding sites. Furthermore, five chemosensors (CD1, CD3, QD1, ND1, and ND2) were synthesized and characterized using azo dye reactions, revealing their unique absorption behaviors. Chemosensor CD1 showed high selectivity towards Hg2+ under both absorption and emission spectroscopy. Job's plot studies confirmed a stable 1:1 complex formation. The presence of competing cations did not affect complex formation, emphasizing its stability and selectivity. Another coumarin-containing dye chemosensor, CD3, was synthesized as a novel chemosensor. In the presence of TBA anionic solutions, CD3 exhibited strong absorption bands and selectivity for OH- ions, forming a stable complex with them. Quantitative studies, including the determination of LOD and LOQ, were also conducted. The binding stoichiometry of 1:1 between CD3 and OH- was established through Job's plot analysis. Lastly, two naphthalene dyes were synthesized. However, they did not exhibit selectivity towards cations or anions. Interestingly, their absorption spectra were affected by the change in solvent system, a concept worth exploring in future work. Chemosensor ND1 and ND2 did not show any cation or anion selectivity. However, they demonstrated different spectra and colour responses to cations and anions in different water-DMSO solvent systems. , Thesis (PhD) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Hamukoshi, Simeon Shiweda
- Date: 2024-04
- Subjects: Molecular recognition , Solution (Chemistry) , Water chemistry
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63787 , vital:73613
- Description: Fluorescent molecular chemosensors are crucial tools for monitoring toxic metal ions and environmental compounds that pose risks to both humans and wildlife. Continuous sensing is essential for early detection, and chemosensors offer a sensitive and straightforward approach by detecting challenging analyte’s through optical absorption and fluorescence. Current detection methods, such as flame photometry and mass spectrometry, can be expensive, destructive, and impractical for continuous monitoring. Consequently, fluorescent-based methods present a promising, simple, and highly sensitive alternative for chemical recognition and monitoring. In this project, we successfully synthesized ten highly selective small hydroxyl containing molecule fluorescent and colorimetric sensors; Oxime Dye (OD), Small Sensor 1 (SS1), Small Sensor 2 (SS2), Quinoline Dye 1 (QD1), Quinoline Dye 2 (QD2), Quinoline Dye 3 (QD3), Coumarin Dye 1 (CD1), Coumarin Dye 2 (CD2), Naphthalene Dye 1 (ND1), Naphthalene Dye 2 (ND2). These chemosensors contained benzothiazole, naphthalene, quinoline, and coumarin fluorophores. These sensors facilitate both quantitative and qualitative assessment of cationic and anionic species in aqueous organic media. The chemosensors were synthesized using modified Schiff base, azo dye, and oxime-based reactions, enhancing binding and selectivity with analyte’s. They exhibited selectivity towards various metal ions (Cu2+, Fe2+, Ni2+, and Hg2+) and anions (hydroxyl and cyanate), characterized by distinct absorption bands and significant fluorescent quenching and enhancement. While some sensors were selective towards both cations and anions, others exclusively targeted cations, showing lower selectivity or sensitivity towards anions upon further testing. Conversely, certain sensors were selective towards anions, demonstrating reduced sensitivity or selectivity towards the tested cations. The oxime-based chemosensor, OD, was obtained through an oxime-based reaction. The sensor demonstrates remarkable selectivity for Cu2+ and cyanate ions. During titration experiments, the interaction of Cu2+ with OD resulted in a noticeable fluorescence quenching effect, while the presence of OCN ions led to fluorescence enhancement. These distinct behaviors strongly suggest the formation of specific 1:1 complexes between OD and Cu2+ or OCN ions, a conclusion supported by detailed analysis using the Jobs plot technique. In addition to the fluorescence studies, investigations into the influence of pH on the sensor OD, as well as its complexes with Cu2+ and OCN, were conducted to determine the optimum pH conditions for their operation. Moreover, reversible behavior of the complexes was explored in the presence of EDTA, revealing that only the OD-OCN complex displayed reversibility. Furthermore, molecular modeling studies were performed to validate the binding units and calculate the energy differences between the sensor and its respective complexes. Additionally, four chemosensors (SS1, SS2, CD2, and QD2) were synthesized and characterized using Schiff-based reactions, showcasing their unique absorption behaviors. SS1 and SS2, characterized by benzothiazole fluorophores, demonstrated high sensitivity to hydroxyl anions. Jobs plot studies revealed a stable 1:1 binding stoichiometry. Chemosensor CD2, incorporating a coumarin fluorophore, was structurally confirmed but showed no significant spectral changes when screened with various ions. Chemosensor QD2 exhibited remarkable selectivity for Fe2+ ions, and stable 1:1 complexes were confirmed. Further molecular modeling studies were conducted to identify potential binding sites. Furthermore, five chemosensors (CD1, CD3, QD1, ND1, and ND2) were synthesized and characterized using azo dye reactions, revealing their unique absorption behaviors. Chemosensor CD1 showed high selectivity towards Hg2+ under both absorption and emission spectroscopy. Job's plot studies confirmed a stable 1:1 complex formation. The presence of competing cations did not affect complex formation, emphasizing its stability and selectivity. Another coumarin-containing dye chemosensor, CD3, was synthesized as a novel chemosensor. In the presence of TBA anionic solutions, CD3 exhibited strong absorption bands and selectivity for OH- ions, forming a stable complex with them. Quantitative studies, including the determination of LOD and LOQ, were also conducted. The binding stoichiometry of 1:1 between CD3 and OH- was established through Job's plot analysis. Lastly, two naphthalene dyes were synthesized. However, they did not exhibit selectivity towards cations or anions. Interestingly, their absorption spectra were affected by the change in solvent system, a concept worth exploring in future work. Chemosensor ND1 and ND2 did not show any cation or anion selectivity. However, they demonstrated different spectra and colour responses to cations and anions in different water-DMSO solvent systems. , Thesis (PhD) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
Synthesis and applications of novel coumarin-based chemosensors for the detection of metal ions using UV-visible spectroscopy
- Authors: Myburgh, Lisa
- Date: 2024-04
- Subjects: Biosensors , Molecular recognition , Chemical detectors
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64239 , vital:73668
- Description: Current methods for ion detection are expensive and require trained personnel to operate the instruments. This led to the desire for alternative techniques that are quicker, easier to operate, cheaper, and highly efficient. With this in mind, coumarinbased derivatives were designed and synthesised using Knoevenagel condensation. These compounds were designed to incorporate different functional groups at the 3- position. Compounds S1, S2, and S3 contained keto, ester, and carboxylic acid groups, respectively. The structures of these compounds were confirmed using NMR, FT-IR, and X-ray crystal structures. During UV-Vis analysis, these compounds displayed a maximum absorption band between λmax= 289 and 295 nm, attributed to the coumarin moiety. Furthermore, the absorption behaviour of S2 was analysed in different solvent systems. It was noted that when S2 was dissolved in toluene, a significant absorbance increase and a hypsochromic shift were observed. The chemosensing capabilities of S1, S2 and S3 were investigated using UV-Vis for metal cations in acetonitrile. S1 and S3 showed selectivities towards Fe²⁺ ions, with S2 being selective for Fe³⁺ ions in a 1:1 binding ratio. Reversibility studies were performed using EDTA and revealed that S1 and S3 were partially reversible, with S2 showing nonreversibility properties. Lastly, the binding modes of these compounds with metal ions were determined using molecular modelling studies. These calculations concluded that the complexation occurs via the two carbonyl moieties from the coumarin ring and the ester group and is stabilised by nitrate counterions and water molecules. To change the selectivity of S2 towards Hg2+ ions, thiocarbonyl analogues of this compound were synthesised using Lawessons reagent. The reagent replaced the carbonyl oxygen of the coumarin backbone and the ester moiety with sulphur to form their respective analogues, S5 and S6. A switch in the selectivity of S5 and S6 was noted when tested as potential chemosensors for metal ions. S5 showed a high affinity for Hg²⁺, whereas S6 strongly interacted with both Hg²⁺ and Cu²⁺ ions in a 1:1 binding ratio. The mode of interaction was confirmed to occur between the thiocarbonyl and ester carbonyl group for S5 and between the two thiocarbonyl functional groups in S6. The viability of these novel chemosensors for detecting metal ions was then further tested in water samples obtained from local dams with positive results. , Thesis (MSc) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Myburgh, Lisa
- Date: 2024-04
- Subjects: Biosensors , Molecular recognition , Chemical detectors
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64239 , vital:73668
- Description: Current methods for ion detection are expensive and require trained personnel to operate the instruments. This led to the desire for alternative techniques that are quicker, easier to operate, cheaper, and highly efficient. With this in mind, coumarinbased derivatives were designed and synthesised using Knoevenagel condensation. These compounds were designed to incorporate different functional groups at the 3- position. Compounds S1, S2, and S3 contained keto, ester, and carboxylic acid groups, respectively. The structures of these compounds were confirmed using NMR, FT-IR, and X-ray crystal structures. During UV-Vis analysis, these compounds displayed a maximum absorption band between λmax= 289 and 295 nm, attributed to the coumarin moiety. Furthermore, the absorption behaviour of S2 was analysed in different solvent systems. It was noted that when S2 was dissolved in toluene, a significant absorbance increase and a hypsochromic shift were observed. The chemosensing capabilities of S1, S2 and S3 were investigated using UV-Vis for metal cations in acetonitrile. S1 and S3 showed selectivities towards Fe²⁺ ions, with S2 being selective for Fe³⁺ ions in a 1:1 binding ratio. Reversibility studies were performed using EDTA and revealed that S1 and S3 were partially reversible, with S2 showing nonreversibility properties. Lastly, the binding modes of these compounds with metal ions were determined using molecular modelling studies. These calculations concluded that the complexation occurs via the two carbonyl moieties from the coumarin ring and the ester group and is stabilised by nitrate counterions and water molecules. To change the selectivity of S2 towards Hg2+ ions, thiocarbonyl analogues of this compound were synthesised using Lawessons reagent. The reagent replaced the carbonyl oxygen of the coumarin backbone and the ester moiety with sulphur to form their respective analogues, S5 and S6. A switch in the selectivity of S5 and S6 was noted when tested as potential chemosensors for metal ions. S5 showed a high affinity for Hg²⁺, whereas S6 strongly interacted with both Hg²⁺ and Cu²⁺ ions in a 1:1 binding ratio. The mode of interaction was confirmed to occur between the thiocarbonyl and ester carbonyl group for S5 and between the two thiocarbonyl functional groups in S6. The viability of these novel chemosensors for detecting metal ions was then further tested in water samples obtained from local dams with positive results. , Thesis (MSc) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
Synthesis of gatifloxacin, an important fluoroquinolone antibiotic using continuous flow technology
- Authors: Moyo, McQuillan
- Date: 2024-04
- Subjects: Antibiotics , Drug resistance in microorganisms , Chemical processes
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/64204 , vital:73664
- Description: Gatifloxacin belongs to an important class of antibiotics known as fluoroquinolones (the fourth generation). Bristol-Myers Squibb (BMS) introduced gatifloxacin to the market in 1999 under the brand name Tequin® for treating respiratory tract infections. It has recently been widely employed as an ophthalmic solution for treating bacterial conjunctivitis. There is limited literature describing the complete synthesis of gatifloxacin; however, ciprofloxacin, a similar fluoroquinolone, has received much attention recently and is a good guide in the synthesis. Even though there are several similarities between ciprofloxacin and gatifloxacin, key reactions towards the synthesis of gatifloxacin have not been reported, which forms a knowledge gap, for instance, the three steps leading to the synthesis of the benzoyl chloride intermediate. It is estimated that 70-90 % of the active pharmaceutical ingredients (APIs) in drugs consumed in sub-Saharan Africa are imported, mainly from India, China and Europe. To reduce dependence and improve access to life-saving drugs, Africa needs to develop cutting-edge technology that is more advanced than traditional means. We envisage that employing continuous flow technology in synthesising gatifloxacin, previously developed in a batch setup, will offer an improved, future-proof process. Thus, this research aimed to create a more efficient multi-step continuous flow process for synthesising gatifloxacin compared to the current batch methods. The first chapter of this thesis provides an extensive literature review on the synthesis of gatifloxacin and its sister drug, ciprofloxacin. The foreground is based on the manufacture and consumption of APIs, particularly antibiotics. Continuous flow technology is also introduced and discussed as the solution to bridging the gap in Africa’s demand for API manufacturing, which significantly lags. Chapter two describes the results and discusses findings on the continuous flow synthesis of gatifloxacin. A seven-step process is described with reaction optimisation studies for each step, starting from 2,4,5-trifluoro-3-hydroxybenzoic acid. An alternative shorter route (with six steps) is also offered, incorporating microwave-assisted technology instead of the traditional batch process. We also describe several elegant multistep processes for synthesising gatifloxacin and its intermediates, achieved by combining several compatible, optimised steps. Subsequently, Chapter 3 describes all the experimental details of our research. In this study, efficient continuous flow procedures were developed to synthesise gatifloxacin. The seven-step continuous flow procedure we developed afforded gatifloxacin (54 % overall isolated yield) in a total residence time of 15.6 mins, a significant improvement from the reported batch process (52 % overall yield and over 103 hours reaction time). , Thesis (PhD) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Moyo, McQuillan
- Date: 2024-04
- Subjects: Antibiotics , Drug resistance in microorganisms , Chemical processes
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/64204 , vital:73664
- Description: Gatifloxacin belongs to an important class of antibiotics known as fluoroquinolones (the fourth generation). Bristol-Myers Squibb (BMS) introduced gatifloxacin to the market in 1999 under the brand name Tequin® for treating respiratory tract infections. It has recently been widely employed as an ophthalmic solution for treating bacterial conjunctivitis. There is limited literature describing the complete synthesis of gatifloxacin; however, ciprofloxacin, a similar fluoroquinolone, has received much attention recently and is a good guide in the synthesis. Even though there are several similarities between ciprofloxacin and gatifloxacin, key reactions towards the synthesis of gatifloxacin have not been reported, which forms a knowledge gap, for instance, the three steps leading to the synthesis of the benzoyl chloride intermediate. It is estimated that 70-90 % of the active pharmaceutical ingredients (APIs) in drugs consumed in sub-Saharan Africa are imported, mainly from India, China and Europe. To reduce dependence and improve access to life-saving drugs, Africa needs to develop cutting-edge technology that is more advanced than traditional means. We envisage that employing continuous flow technology in synthesising gatifloxacin, previously developed in a batch setup, will offer an improved, future-proof process. Thus, this research aimed to create a more efficient multi-step continuous flow process for synthesising gatifloxacin compared to the current batch methods. The first chapter of this thesis provides an extensive literature review on the synthesis of gatifloxacin and its sister drug, ciprofloxacin. The foreground is based on the manufacture and consumption of APIs, particularly antibiotics. Continuous flow technology is also introduced and discussed as the solution to bridging the gap in Africa’s demand for API manufacturing, which significantly lags. Chapter two describes the results and discusses findings on the continuous flow synthesis of gatifloxacin. A seven-step process is described with reaction optimisation studies for each step, starting from 2,4,5-trifluoro-3-hydroxybenzoic acid. An alternative shorter route (with six steps) is also offered, incorporating microwave-assisted technology instead of the traditional batch process. We also describe several elegant multistep processes for synthesising gatifloxacin and its intermediates, achieved by combining several compatible, optimised steps. Subsequently, Chapter 3 describes all the experimental details of our research. In this study, efficient continuous flow procedures were developed to synthesise gatifloxacin. The seven-step continuous flow procedure we developed afforded gatifloxacin (54 % overall isolated yield) in a total residence time of 15.6 mins, a significant improvement from the reported batch process (52 % overall yield and over 103 hours reaction time). , Thesis (PhD) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
Technological Pedagogical Content Knowledge (TPACK): investigating senior primary mathematics teachers’ integration of technology in the classroom in Okahao educational circuit
- Shikesho, Hilya Ndahambelela
- Authors: Shikesho, Hilya Ndahambelela
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423913 , vital:72104
- Description: The overwhelming advancement of ICT devices in the contemporary Namibian education system has led to their praise for supporting differentiated instruction, fostering collaboration, and engaging multiple intelligences in teaching and learning. Consequently, the compulsory incorporation of ICTs into the teaching and learning process becomes imperative across various fields of study, including Mathematics. However, the integration of technology-based teaching proves to be a complex and challenging issue, often considered a wicked problem. To explore this matter, a qualitative case study was conducted to investigate how Senior Primary Mathematics Teachers integrated technology to develop their TPACK. The study was conducted among the twenty-seven senior primary mathematics teachers in the Okahao educational circuit in the Omuasti region. The study utilized Vygotsky‘s (1978); Socio-cultural Theory, together with Mishra and Koehler (2006), and; the Technological Pedagogical Content Knowledge (TPACK) framework was used as a lens to analyse the data. The data were gathered through semi-structured questionnaires, semi-structured interviews, focus group interviews, and lesson observations. The study findings indicate that senior primary mathematics teachers utilize the available resources at their respective schools during their classroom instruction. The study further reveals that mathematics teachers exhibit a positive attitude toward the integration of technology. The study uncovers the intricate interplay between technological knowledge, pedagogical expertise, and content knowledge within the context of mathematics education. The findings reveal that while participants demonstrate a high level of proficiency in certain TPACK components such as CK, TK, PK, TPK, and PCK, they expressed a moderate level of expertise in TCK and TPCK. The study also identified challenges in TPACK development, particularly the need for subject specific technology training, lack of technological infrastructure, particularly advanced technology, as well as a deficiency in ICT knowledge. The importance of access to various technologies was emphasized, enabling teachers to seamlessly integrate technology into their practices and address diverse learning styles. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Shikesho, Hilya Ndahambelela
- Date: 2024-04
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/423913 , vital:72104
- Description: The overwhelming advancement of ICT devices in the contemporary Namibian education system has led to their praise for supporting differentiated instruction, fostering collaboration, and engaging multiple intelligences in teaching and learning. Consequently, the compulsory incorporation of ICTs into the teaching and learning process becomes imperative across various fields of study, including Mathematics. However, the integration of technology-based teaching proves to be a complex and challenging issue, often considered a wicked problem. To explore this matter, a qualitative case study was conducted to investigate how Senior Primary Mathematics Teachers integrated technology to develop their TPACK. The study was conducted among the twenty-seven senior primary mathematics teachers in the Okahao educational circuit in the Omuasti region. The study utilized Vygotsky‘s (1978); Socio-cultural Theory, together with Mishra and Koehler (2006), and; the Technological Pedagogical Content Knowledge (TPACK) framework was used as a lens to analyse the data. The data were gathered through semi-structured questionnaires, semi-structured interviews, focus group interviews, and lesson observations. The study findings indicate that senior primary mathematics teachers utilize the available resources at their respective schools during their classroom instruction. The study further reveals that mathematics teachers exhibit a positive attitude toward the integration of technology. The study uncovers the intricate interplay between technological knowledge, pedagogical expertise, and content knowledge within the context of mathematics education. The findings reveal that while participants demonstrate a high level of proficiency in certain TPACK components such as CK, TK, PK, TPK, and PCK, they expressed a moderate level of expertise in TCK and TPCK. The study also identified challenges in TPACK development, particularly the need for subject specific technology training, lack of technological infrastructure, particularly advanced technology, as well as a deficiency in ICT knowledge. The importance of access to various technologies was emphasized, enabling teachers to seamlessly integrate technology into their practices and address diverse learning styles. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
- Full Text:
- Date Issued: 2024-04
The Algoa Bay region groundwater cycle – linking source to coast
- Authors: Dodd, Carla
- Date: 2024-04
- Subjects: Ecohydrology , Hydrology , Groundwater -- Management
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63722 , vital:73592
- Description: Groundwater is a crucial component of freshwater supply globally, especially in water-scarce regions such as semi-arid climatic areas where surface water resources are climatically limited and further constrained during droughts. Groundwater resources are also important from an ecological perspective as they support numerous surface ecosystems including wetlands and rivers. Coastal groundwater discharge along the South African coast sustains supratidal spring-fed living microbialite ecosystems (SSLiME). These systems act as potential analogues for Earth’s earliest ecosystems and are therefore useful from a palaeoscientific and evolutionary perspective. The Southern Cape coast of South Africa is characterised by both fractured and intergranular aquifers and hosts the most extensive network of SSLiME reported globally. However, the region is frequently affected by water scarcity crises and consequently groundwater development and usage has increased. Yet, it is unclear to what extent coastal discharge is linked to inland aquifers and whether anthropogenic activities influence the quantity and quality of groundwater that flows into SSLiME. This thesis aims to assess the groundwater cycle of the Algoa Bay region along the Southern Cape coast by means of a multi-tracer study. Specifically, it endeavours to develop a better understanding of the hydrogeochemical connectivity between inland groundwater resources and coastal microbialite ecosystems. To achieve this, four groups of hydrochemical tracers were used: H- and O-isotope ratios, major cations and anions, organic micropollutants and macronutrients. Sampling strategies included monthly precipitation collection over twelve months (stable water isotopes), once-off groundwater collection from boreholes, inland springs and coastal discharge (all tracers). In addition, coastal groundwater discharge was sampled during a once-off repeat campaign (all tracers) and seasonally at selected sites (macronutrients). A local meteoric water line (LMWL) for the region was established and compared to the isotopic signature of groundwater. The results indicate that groundwater is likely recharged directly and with little evaporation. Furthermore, similarities in isotopic signatures between inland and coastal aquifer systems suggest some level of hydrogeological connectivity or similar environmental drivers of recharge, such as precipitation amount and moisture source. This is also supported by the physico-chemistry and major ionic composition of the groundwater samples. However, the major ion composition of groundwater is variable and, although it predominantly reflects the sodium-chloride nature of precipitation, lithological and spatial trends are apparent. For example, coastward trends such as increasing conductivity, calcium, total alkalinity, and nitrogen is evident. While isotopes and major ions inform on the environmental drivers and geogenic influence on groundwater recharge, the organic micropollutants and macronutrients provide insight into the nature of anthropogenic impacts on groundwater quality. Micropollutants quantified in the groundwater samples included artificial sweeteners, pharmaceuticals, a biocide, and an illicit drug. These compounds are mostly classed as wastewater indicators and indicate aquifer contamination from leaking reticulation systems and septic tanks. The highest concentrations are associated with the urban and coastal peri-urban areas, while groundwater from rural areas is often devoid of any micropollutants except sulfamic acid, which may be introduced during recharge from precipitation. Furthermore, the presence of selected compounds in groundwater discharge signifies that at least a component of the groundwater is derived from recent infiltration. Similarly, the macronutrient content of groundwater reflects the proximal land use. As such, coastal groundwater discharge sites adjacent to coastal villages reflect higher concentrations compared to rural sites. In addition, the nutrient load supplied to and discharged from SSLiME systems is quantified and the nutrient attenuation is estimated. This thesis contributes recent hydrogeochemical information for a structurally complex semi-arid area under both natural (drought conditions) and human (increased water use, degradation of aquifers) pressures. Collectively, the results indicate that coastal groundwater discharge is likely a mixture of both the intergranular and fractured aquifers and that anthropogenic activities in the hinterland is contaminating the groundwater. This study is an important addition to the baseline hydrological information available for the region and may be useful in terms of sustainable groundwater management strategies and development toward a socio-ecological optimum, especially as related to coastal microbialite system. , Thesis (PhD) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Dodd, Carla
- Date: 2024-04
- Subjects: Ecohydrology , Hydrology , Groundwater -- Management
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63722 , vital:73592
- Description: Groundwater is a crucial component of freshwater supply globally, especially in water-scarce regions such as semi-arid climatic areas where surface water resources are climatically limited and further constrained during droughts. Groundwater resources are also important from an ecological perspective as they support numerous surface ecosystems including wetlands and rivers. Coastal groundwater discharge along the South African coast sustains supratidal spring-fed living microbialite ecosystems (SSLiME). These systems act as potential analogues for Earth’s earliest ecosystems and are therefore useful from a palaeoscientific and evolutionary perspective. The Southern Cape coast of South Africa is characterised by both fractured and intergranular aquifers and hosts the most extensive network of SSLiME reported globally. However, the region is frequently affected by water scarcity crises and consequently groundwater development and usage has increased. Yet, it is unclear to what extent coastal discharge is linked to inland aquifers and whether anthropogenic activities influence the quantity and quality of groundwater that flows into SSLiME. This thesis aims to assess the groundwater cycle of the Algoa Bay region along the Southern Cape coast by means of a multi-tracer study. Specifically, it endeavours to develop a better understanding of the hydrogeochemical connectivity between inland groundwater resources and coastal microbialite ecosystems. To achieve this, four groups of hydrochemical tracers were used: H- and O-isotope ratios, major cations and anions, organic micropollutants and macronutrients. Sampling strategies included monthly precipitation collection over twelve months (stable water isotopes), once-off groundwater collection from boreholes, inland springs and coastal discharge (all tracers). In addition, coastal groundwater discharge was sampled during a once-off repeat campaign (all tracers) and seasonally at selected sites (macronutrients). A local meteoric water line (LMWL) for the region was established and compared to the isotopic signature of groundwater. The results indicate that groundwater is likely recharged directly and with little evaporation. Furthermore, similarities in isotopic signatures between inland and coastal aquifer systems suggest some level of hydrogeological connectivity or similar environmental drivers of recharge, such as precipitation amount and moisture source. This is also supported by the physico-chemistry and major ionic composition of the groundwater samples. However, the major ion composition of groundwater is variable and, although it predominantly reflects the sodium-chloride nature of precipitation, lithological and spatial trends are apparent. For example, coastward trends such as increasing conductivity, calcium, total alkalinity, and nitrogen is evident. While isotopes and major ions inform on the environmental drivers and geogenic influence on groundwater recharge, the organic micropollutants and macronutrients provide insight into the nature of anthropogenic impacts on groundwater quality. Micropollutants quantified in the groundwater samples included artificial sweeteners, pharmaceuticals, a biocide, and an illicit drug. These compounds are mostly classed as wastewater indicators and indicate aquifer contamination from leaking reticulation systems and septic tanks. The highest concentrations are associated with the urban and coastal peri-urban areas, while groundwater from rural areas is often devoid of any micropollutants except sulfamic acid, which may be introduced during recharge from precipitation. Furthermore, the presence of selected compounds in groundwater discharge signifies that at least a component of the groundwater is derived from recent infiltration. Similarly, the macronutrient content of groundwater reflects the proximal land use. As such, coastal groundwater discharge sites adjacent to coastal villages reflect higher concentrations compared to rural sites. In addition, the nutrient load supplied to and discharged from SSLiME systems is quantified and the nutrient attenuation is estimated. This thesis contributes recent hydrogeochemical information for a structurally complex semi-arid area under both natural (drought conditions) and human (increased water use, degradation of aquifers) pressures. Collectively, the results indicate that coastal groundwater discharge is likely a mixture of both the intergranular and fractured aquifers and that anthropogenic activities in the hinterland is contaminating the groundwater. This study is an important addition to the baseline hydrological information available for the region and may be useful in terms of sustainable groundwater management strategies and development toward a socio-ecological optimum, especially as related to coastal microbialite system. , Thesis (PhD) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
The Camdeboo-Mountain Zebra mega-reserve as an opportunity to protect viable populations of medium- to large-sized mammals
- Authors: Davis, Kristen
- Date: 2024-04
- Subjects: Mammals -- Ecology -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape , Wildlife conservation -- South Africa -- Eastern Cape
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63711 , vital:73590
- Description: Conservation planning has focused extensively on representation of species in protected areas (PAs), rather than achieving the persistence of these species in PAs. Consequently, most PAs do not support viable populations of many species represented within them, particularly large mammals, resulting in extinction debt risks. The challenge is therefore to identify opportunities to achieve viable populations and to develop and implement conservation plans to achieve this, e.g., expand and connect existing PAs. A recent meta-analysis provides a minimum viable population (MVP) estimate of 5 000 individuals for mammals. This value was used as the target for modelling conservation opportunities for the South African endemic Cape mountain zebra (Equus zebra zebra), blesbok (Damaliscus pygargus phillipsi), black wildebeest (Connochaetes gnou) and co-existing medium- and large-sized mammal species. This study focused on the region between the Camdeboo and Mountain Zebra national parks (ca. 736 000 ha). Within the envisaged Camdeboo-Mountain Zebra (C-MZ) mega-reserve, a spreadsheet model was used to estimate potential herbivore population sizes, spatial requirement data were used to estimate potential omnivore and insectivore population sizes, and herbivore densities were used to estimate potential large carnivore population sizes. I show that 12 (the three endemic grazers and nine co-existing species) of the 28 modelled medium- and large-sized mammal species will potentially exceed 5 000 individuals, the MVP target, within the envisaged mega-reserve. The remaining 16 species show potential to reach substantial population sizes, however, will likely require ongoing metapopulation management. Using a conservation planning approach, I identify priority areas for the conservation of suitable habitat for Cape mountain zebra, blesbok, and black wildebeest within the envisaged mega-reserve, thus indirectly identifying priority areas for the conservation of these endemic species. I show that the potential incorporation of these priority areas within the envisaged mega-reserve will contribute considerably to the conservation of all focal species. In addition, the potential incorporation of these priority areas will contribute to PA expansion and significantly improve connectivity between existing PAs within the envisaged C-MZ mega-reserve. The importance of adequately-sized PAs to support viable populations of focal species is thus evident, and will ensure their long-term survival and ability to persist by allowing population and evolutionary scale processes. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Davis, Kristen
- Date: 2024-04
- Subjects: Mammals -- Ecology -- South Africa -- Eastern Cape , Conservation of natural resources -- South Africa -- Eastern Cape , Wildlife conservation -- South Africa -- Eastern Cape
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63711 , vital:73590
- Description: Conservation planning has focused extensively on representation of species in protected areas (PAs), rather than achieving the persistence of these species in PAs. Consequently, most PAs do not support viable populations of many species represented within them, particularly large mammals, resulting in extinction debt risks. The challenge is therefore to identify opportunities to achieve viable populations and to develop and implement conservation plans to achieve this, e.g., expand and connect existing PAs. A recent meta-analysis provides a minimum viable population (MVP) estimate of 5 000 individuals for mammals. This value was used as the target for modelling conservation opportunities for the South African endemic Cape mountain zebra (Equus zebra zebra), blesbok (Damaliscus pygargus phillipsi), black wildebeest (Connochaetes gnou) and co-existing medium- and large-sized mammal species. This study focused on the region between the Camdeboo and Mountain Zebra national parks (ca. 736 000 ha). Within the envisaged Camdeboo-Mountain Zebra (C-MZ) mega-reserve, a spreadsheet model was used to estimate potential herbivore population sizes, spatial requirement data were used to estimate potential omnivore and insectivore population sizes, and herbivore densities were used to estimate potential large carnivore population sizes. I show that 12 (the three endemic grazers and nine co-existing species) of the 28 modelled medium- and large-sized mammal species will potentially exceed 5 000 individuals, the MVP target, within the envisaged mega-reserve. The remaining 16 species show potential to reach substantial population sizes, however, will likely require ongoing metapopulation management. Using a conservation planning approach, I identify priority areas for the conservation of suitable habitat for Cape mountain zebra, blesbok, and black wildebeest within the envisaged mega-reserve, thus indirectly identifying priority areas for the conservation of these endemic species. I show that the potential incorporation of these priority areas within the envisaged mega-reserve will contribute considerably to the conservation of all focal species. In addition, the potential incorporation of these priority areas will contribute to PA expansion and significantly improve connectivity between existing PAs within the envisaged C-MZ mega-reserve. The importance of adequately-sized PAs to support viable populations of focal species is thus evident, and will ensure their long-term survival and ability to persist by allowing population and evolutionary scale processes. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
The curious case of Albert Ellis: a psychobiographical case study
- Authors: van Rensburg, Philip
- Date: 2024-04
- Subjects: Psychotherapy , Ellis, Albert -- Interviews , Rational emotive behavior therapy
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/63928 , vital:73627
- Description: Although much has been written on the life and work of American psychologist Albert Ellis, none of the literature adopts a specific psychobiographical framework and no instrumental case studies on the life of Ellis exist. The primary aim of this psychobiographical case study is to provide a psychobiographical exploration and description of aspects of Albert Ellis’ life within his sociohistorical context. More specifically, Ellis’ upbringing with an immigrant past and the role this has played relating to Ellis’ curiosity towards issues of sex and women. The findings of this psychobiographical case study will also be conveyed to inform on the role that culture and cultural diversity has on how an individual experiences and deals with conflict in their life. A specific area of interest in this study is the culture of the twentieth century, with a special focus on the relationship individuals had with sex, as well as examining the lived experience of immigrants during this time. Aspects of Albert Ellis' life within the sociohistorical context of the twentieth century is illustrated by using certain psychological techniques to the available biographical data. This is accomplished by looking at Ellis' experiences and how they influenced the creation of his own paradigm of rational emotive behaviour therapy. Furthermore, Ellis is conceptualised using Karen Horney’s theory of the dynamic relationship, which exists between cultural processes and conflicting human character traits and their impact on behavioural motivation. This study adopts an inductive research approach. Therefore, it implements an instrumental, single-case research design and is exploratory-descriptive in nature. The subject was chosen through purposive sampling and data will be analysed utilising three linked subprocesses theorised by Miles and Huberman. , Thesis (DPhil) -- Faculty of Health Science, School of Behavioural & Lifestyle Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: van Rensburg, Philip
- Date: 2024-04
- Subjects: Psychotherapy , Ellis, Albert -- Interviews , Rational emotive behavior therapy
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/63928 , vital:73627
- Description: Although much has been written on the life and work of American psychologist Albert Ellis, none of the literature adopts a specific psychobiographical framework and no instrumental case studies on the life of Ellis exist. The primary aim of this psychobiographical case study is to provide a psychobiographical exploration and description of aspects of Albert Ellis’ life within his sociohistorical context. More specifically, Ellis’ upbringing with an immigrant past and the role this has played relating to Ellis’ curiosity towards issues of sex and women. The findings of this psychobiographical case study will also be conveyed to inform on the role that culture and cultural diversity has on how an individual experiences and deals with conflict in their life. A specific area of interest in this study is the culture of the twentieth century, with a special focus on the relationship individuals had with sex, as well as examining the lived experience of immigrants during this time. Aspects of Albert Ellis' life within the sociohistorical context of the twentieth century is illustrated by using certain psychological techniques to the available biographical data. This is accomplished by looking at Ellis' experiences and how they influenced the creation of his own paradigm of rational emotive behaviour therapy. Furthermore, Ellis is conceptualised using Karen Horney’s theory of the dynamic relationship, which exists between cultural processes and conflicting human character traits and their impact on behavioural motivation. This study adopts an inductive research approach. Therefore, it implements an instrumental, single-case research design and is exploratory-descriptive in nature. The subject was chosen through purposive sampling and data will be analysed utilising three linked subprocesses theorised by Miles and Huberman. , Thesis (DPhil) -- Faculty of Health Science, School of Behavioural & Lifestyle Sciences, 2024
- Full Text:
- Date Issued: 2024-04
The demographic-specific prey preferences of lions and cheetahs, and potential impacts on prey populations
- Authors: Dreyer, Nicola Bondi
- Date: 2024-04
- Subjects: Predation (Biology) , Animal populations , Animal ecology
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63733 , vital:73593
- Description: Understanding prey selection offers predictive insights into predator-prey interactions, which can be extended to explore the impacts of predators on prey populations. Prey availability and vulnerability vary across species, demographic classes, body sizes, and seasons. Traditional prey selection models for large carnivores, based on estimates of prey body size, assume uniform vulnerability across prey demographic classes and seasons, failing to account for these variations. This study aims to contrast seasonal shifts in demographic-specific prey preferences between lions and cheetahs and examine the potential impact of their demographic-specific predation patterns on a range of prey species across a body size spectrum. It was predicted that cheetahs would shift their selection from adults and juveniles of smaller prey species in the dry season to neonates and juveniles of both smaller and larger prey species in the wet season, while lions would select adults irrespective of the season. Additionally, predation focusing on adults would have a greater impact on prey populations compared to predation focusing on non-adults. Furthermore, it was predicted that prey populations experiencing demographic-specific selection from both lions and cheetahs would be impacted more than species selected by only one predator. Degrees of preference (DOP) were estimated based on prey availability (camera traps) and prey use (GPS clusters) for lion and cheetah populations in Lapalala Wilderness Reserve. Generalized Additive Models for Location, Scale, and Shape (GAMLSS) were used to determine seasonal shifts in demographic-specific prey preferences. The seasonal-demographic specific predation patterns of lion and cheetah, along with prey vital rates extracted from the literature, were then used to model potential predation impacts on prey populations using both Leslie-Usher and Lefkovitch matrix models. Lions preferred larger adult prey such as blue wildebeest, eland, and buffalo, while cheetahs preferred smaller prey, particularly juveniles of small to intermediate-sized species like impala, kudu, blue wildebeest, and zebra. Both predators showed seasonal shifts in demographic-specific prey preferences, with lions selecting adult buffalo during the dry season and juvenile buffalo in the wet season, and cheetahs selecting juveniles in the dry season and neonates and juveniles during the wet season. Lions and cheetahs exerted the highest degree of top-down limitations on their preferred prey. Predation on adult prey had a greater effect on prey population growth rates than predation on non-adults, especially in the dry season. Intermediate-sized prey species experienced the highest predation pressures, while larger prey species were more affected than smaller ones, contrary to the size-nested predation hypothesis. My study represents a first effort in the southern hemisphere to model the demographic impacts of multiple predators on diverse prey species, incorporating seasonal and demographic-specific prey preferences. The findings emphasise the importance of incorporating prey demographics and seasonality in predator-prey studies as these refined studies have implications for the management and conservation of both predator and prey populations. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Dreyer, Nicola Bondi
- Date: 2024-04
- Subjects: Predation (Biology) , Animal populations , Animal ecology
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63733 , vital:73593
- Description: Understanding prey selection offers predictive insights into predator-prey interactions, which can be extended to explore the impacts of predators on prey populations. Prey availability and vulnerability vary across species, demographic classes, body sizes, and seasons. Traditional prey selection models for large carnivores, based on estimates of prey body size, assume uniform vulnerability across prey demographic classes and seasons, failing to account for these variations. This study aims to contrast seasonal shifts in demographic-specific prey preferences between lions and cheetahs and examine the potential impact of their demographic-specific predation patterns on a range of prey species across a body size spectrum. It was predicted that cheetahs would shift their selection from adults and juveniles of smaller prey species in the dry season to neonates and juveniles of both smaller and larger prey species in the wet season, while lions would select adults irrespective of the season. Additionally, predation focusing on adults would have a greater impact on prey populations compared to predation focusing on non-adults. Furthermore, it was predicted that prey populations experiencing demographic-specific selection from both lions and cheetahs would be impacted more than species selected by only one predator. Degrees of preference (DOP) were estimated based on prey availability (camera traps) and prey use (GPS clusters) for lion and cheetah populations in Lapalala Wilderness Reserve. Generalized Additive Models for Location, Scale, and Shape (GAMLSS) were used to determine seasonal shifts in demographic-specific prey preferences. The seasonal-demographic specific predation patterns of lion and cheetah, along with prey vital rates extracted from the literature, were then used to model potential predation impacts on prey populations using both Leslie-Usher and Lefkovitch matrix models. Lions preferred larger adult prey such as blue wildebeest, eland, and buffalo, while cheetahs preferred smaller prey, particularly juveniles of small to intermediate-sized species like impala, kudu, blue wildebeest, and zebra. Both predators showed seasonal shifts in demographic-specific prey preferences, with lions selecting adult buffalo during the dry season and juvenile buffalo in the wet season, and cheetahs selecting juveniles in the dry season and neonates and juveniles during the wet season. Lions and cheetahs exerted the highest degree of top-down limitations on their preferred prey. Predation on adult prey had a greater effect on prey population growth rates than predation on non-adults, especially in the dry season. Intermediate-sized prey species experienced the highest predation pressures, while larger prey species were more affected than smaller ones, contrary to the size-nested predation hypothesis. My study represents a first effort in the southern hemisphere to model the demographic impacts of multiple predators on diverse prey species, incorporating seasonal and demographic-specific prey preferences. The findings emphasise the importance of incorporating prey demographics and seasonality in predator-prey studies as these refined studies have implications for the management and conservation of both predator and prey populations. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2024
- Full Text:
- Date Issued: 2024-04
The effectiveness of implementing mediation resolutions in Volkswagen South Africa (VWSA) in Kariega 1994-2021
- Authors: Makasi, Lwando
- Date: 2024-04
- Subjects: Volkswagen (Firm) , Conflict management -- South Africa -- Port Elizabeth , Organizational behavior -- South Africa -- Port Elizabeth
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63207 , vital:73233
- Description: This study aimed to generate an in-depth understanding of how the resolutions are being implemented post-mediation process and the labour union, which in this study is the National Union of Metalworkers of South Africa (NUMSA) and the mediator in the process of managing collective disputes between the employer and employee utilising mediation. The study was limited to the Volkswagen South Africa (VWSA) Kariega plant, therefore, the findings are contextually limited to the VWSA Kariega plant. The theoretical frameworks for this study were relative deprivation theory, frustration-aggression theory, Marxism, and dysfunctional and functional social conflict. These were utilised to explore and describe the phenomenon under investigation. This study employed a qualitative method to answer the research questions and address its problem statement. The data were collected through focus group discussions and elite interviews. The study used a purposive sampling technique, and the sample included 33 participants. The primary research question was: Were the agreements mediated at the VWSA Kariega plant effectively implemented between 1994 and 2021? The study’s findings imply that for the effective implementation of mediation resolutions, the following should be considered: implementing resolutions within the given timeframe, parties at mediation adapting and accommodating new technological changes and disasters at the National Bargaining Forum (NBF) level, prioritising the education and training of shop stewards and VWSA management representatives on NBF agreements, including the implementation thereof. Managing pertinent issues concerning NUMSA and the Automobile Manufacturers Employers Organisation (AMEO), interpreting NBF agreements, and ensuring that parties differentiate between the Labour Relations Act No. 66 of 1995 (LRA) and NBF processes. At the policy level, the findings imply that parties need to understand the LRA’s role and the process of resolving conflict utilising the formal processes stipulated in the LRA and why the LRA cannot override the NBF agreement as an informal process of managing conflict. , Thesis (MA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Makasi, Lwando
- Date: 2024-04
- Subjects: Volkswagen (Firm) , Conflict management -- South Africa -- Port Elizabeth , Organizational behavior -- South Africa -- Port Elizabeth
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63207 , vital:73233
- Description: This study aimed to generate an in-depth understanding of how the resolutions are being implemented post-mediation process and the labour union, which in this study is the National Union of Metalworkers of South Africa (NUMSA) and the mediator in the process of managing collective disputes between the employer and employee utilising mediation. The study was limited to the Volkswagen South Africa (VWSA) Kariega plant, therefore, the findings are contextually limited to the VWSA Kariega plant. The theoretical frameworks for this study were relative deprivation theory, frustration-aggression theory, Marxism, and dysfunctional and functional social conflict. These were utilised to explore and describe the phenomenon under investigation. This study employed a qualitative method to answer the research questions and address its problem statement. The data were collected through focus group discussions and elite interviews. The study used a purposive sampling technique, and the sample included 33 participants. The primary research question was: Were the agreements mediated at the VWSA Kariega plant effectively implemented between 1994 and 2021? The study’s findings imply that for the effective implementation of mediation resolutions, the following should be considered: implementing resolutions within the given timeframe, parties at mediation adapting and accommodating new technological changes and disasters at the National Bargaining Forum (NBF) level, prioritising the education and training of shop stewards and VWSA management representatives on NBF agreements, including the implementation thereof. Managing pertinent issues concerning NUMSA and the Automobile Manufacturers Employers Organisation (AMEO), interpreting NBF agreements, and ensuring that parties differentiate between the Labour Relations Act No. 66 of 1995 (LRA) and NBF processes. At the policy level, the findings imply that parties need to understand the LRA’s role and the process of resolving conflict utilising the formal processes stipulated in the LRA and why the LRA cannot override the NBF agreement as an informal process of managing conflict. , Thesis (MA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2024
- Full Text:
- Date Issued: 2024-04
The effectiveness of the findings of the auditor-general in the control of public funds: a case of Bojanala platinum District Municipality
- Authors: Tshivhenga, Gilbert
- Date: 2024-04
- Subjects: South Africa. -- Office of the Auditor-General -- Appropriations and expenditures , Finance, Public South Africa -- Auditing , Expenditures, Public -- Cost effectiveness
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/62791 , vital:72957
- Description: The study aimed to investigate the effectiveness of the Auditor-General’s findings in controlling public funds, with specific reference to the Bojanala Platinum District Municipality. The research is comprised of six chapters. The research adopted the qualitative research methodology approach. The study provides academic input into public administration, specifically for improving service delivery performance, control and financial performance management in municipalities. The study could contribute to the establishment of effective methods for monitoring municipalities’ control of public funds. The research also identified several strengths and weaknesses of the BPDM, which are vital for effective and efficient service delivery to the community. It is envisaged that other municipalities in South Africa will learn something from it. Furthermore, this research study envisages promoting the best control of public funds within the BPDM and improving the efficiency and effectiveness of service delivery to ensure communities’ well-being and dignity. Based on the findings primarily from the literature review and empirical survey, various recommendations are presented on how the existing status quo of the BPDM can be changed to enhance the better control of public funds, which can assist in service delivery and are aligned with the Batho Pele principles. If these recommendations are adopted, the BPDM will be able to deal with the developmental obstacles it currently faces more effectively and efficiently. , Thesis (MPA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2023
- Full Text:
- Date Issued: 2024-04
- Authors: Tshivhenga, Gilbert
- Date: 2024-04
- Subjects: South Africa. -- Office of the Auditor-General -- Appropriations and expenditures , Finance, Public South Africa -- Auditing , Expenditures, Public -- Cost effectiveness
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/62791 , vital:72957
- Description: The study aimed to investigate the effectiveness of the Auditor-General’s findings in controlling public funds, with specific reference to the Bojanala Platinum District Municipality. The research is comprised of six chapters. The research adopted the qualitative research methodology approach. The study provides academic input into public administration, specifically for improving service delivery performance, control and financial performance management in municipalities. The study could contribute to the establishment of effective methods for monitoring municipalities’ control of public funds. The research also identified several strengths and weaknesses of the BPDM, which are vital for effective and efficient service delivery to the community. It is envisaged that other municipalities in South Africa will learn something from it. Furthermore, this research study envisages promoting the best control of public funds within the BPDM and improving the efficiency and effectiveness of service delivery to ensure communities’ well-being and dignity. Based on the findings primarily from the literature review and empirical survey, various recommendations are presented on how the existing status quo of the BPDM can be changed to enhance the better control of public funds, which can assist in service delivery and are aligned with the Batho Pele principles. If these recommendations are adopted, the BPDM will be able to deal with the developmental obstacles it currently faces more effectively and efficiently. , Thesis (MPA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2023
- Full Text:
- Date Issued: 2024-04
The effects of selected samples on the bio-stimulatory capacity and anti-aging effects of red light on human skin cells
- Authors: Rudolph, Carlen
- Date: 2024-04
- Subjects: Cell culture -- Technique , Dermatologic agents , Collagen , Biochemistry -- Technique
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64347 , vital:73677
- Description: Photobiomodulation (PBM) has gained a remarkable interest in the cosmeceutical industry, with research demonstrating supporting evidence for its use as anti-aging and skin-rejuvenating strategies. It is defined as photons at a non-thermal irradiance or non-ionizing photonic energy that trigger photochemical changes within the cellular structure to alter certain biological activities. Lasers were the main focus during the developmental years of light-based treatments, but since the introduction of non-ablative, light-emitting diode (LED) devices, the focus has changed because of the reduced concerns associated with lasers, such as costs, ablation cutting, thermally coagulating tissue, no downtime needed after treatment, and no trained staff needed for operation. The precise biochemical mechanism for PBM is still to be elucidated; however, accepted theories suggest that it has an influence on the activity of cytochrome c oxidase, a complex located in the electron transport chain, or on the viscosity of the interfacial water layer (IWL) of the mitochondrial membrane. The interaction of those cellular components with the light then leads to the primary responses of increased ROS, ATP production, and intracellular calcium, which ultimately leads to the stimulation of secondary responses that are desired for skin rejuvenation and anti-aging, such as cell proliferation and collagen production. There is controversy surrounding photobiomodulation (PBM), mostly because of the incomplete understanding behind its biochemical mechanism and the number of parameters that require optimization; however, it still poses as a promising field for research into anti-aging properties, as seen in the literature. Besides the use of devices for skin rejuvenation and anti-aging strategies, it is not uncommon to see plant extracts and other natural products being used in current skin care products for the same reason? This is mostly because of their promising bioactivities, some of which include antioxidant, anti-inflammatory, anti-bacterial, collagen-stimulating, and cell-proliferating activities. The aim of this study was to investigate the bio-stimulatory capacity of red light on skin cells and to evaluate possible effects it could have in combination with samples that already show promising anti-aging properties in research. The samples that were selected for this study are: Aspalathus linearis (rooibos) unfermented extract, L-ascorbic acid 2-phosphate, mangrove bee honey, stingless bee honey, Sargassum oligocystum (brown seaweed) and Ulva fasciata (green seaweed).It was found that red light irradiation did indeed stimulate the primary responses of ROS, ATP production, and intracellular calcium levels in HaCaT keratinocytes, as proposed in the hypothesised theory. However, none of the proposed secondary responses to cell proliferation or collagen production were demonstrated. In fact, the opposite was observed for cell proliferation and collagen production, where red light irradiation seemed to be cytostatic towards Hs27 fibroblast cells and caused significant decreases in collagen production. Red light energy dosages of 10, 20 and 30 J/cm2, yielded different primary responses with 20 and 30 J/cm2 generally causing more significant stimulation than that of 10 J/cm2. It should also be noted that even if the desired secondary responses were not observed in this study, it does not mean that red light does not have the capacity to still stimulate them. It is clear that the responses are energy dosage-dependent, and it is suggested that lower energy dosages could possibly lead to cell proliferation and that longer incubation periods post-irradiation are required before measuring the endpoint of collagen production. For the combination of red light irradiation and selected test samples, it was demonstrated that the order of samples that yielded the best outcomes is: stingless bee honey > mangrove bee honey > U. fasciata > S. oligocystum > 2-PAA > green rooibos. Unexpected results were demonstrated for green rooibos in the presence and absence of red light, which included decreased ATP production and collagen biosynthesis. Further investigation is therefore needed to have a better understanding of these unanticipated results. , Thesis (MSc) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Rudolph, Carlen
- Date: 2024-04
- Subjects: Cell culture -- Technique , Dermatologic agents , Collagen , Biochemistry -- Technique
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64347 , vital:73677
- Description: Photobiomodulation (PBM) has gained a remarkable interest in the cosmeceutical industry, with research demonstrating supporting evidence for its use as anti-aging and skin-rejuvenating strategies. It is defined as photons at a non-thermal irradiance or non-ionizing photonic energy that trigger photochemical changes within the cellular structure to alter certain biological activities. Lasers were the main focus during the developmental years of light-based treatments, but since the introduction of non-ablative, light-emitting diode (LED) devices, the focus has changed because of the reduced concerns associated with lasers, such as costs, ablation cutting, thermally coagulating tissue, no downtime needed after treatment, and no trained staff needed for operation. The precise biochemical mechanism for PBM is still to be elucidated; however, accepted theories suggest that it has an influence on the activity of cytochrome c oxidase, a complex located in the electron transport chain, or on the viscosity of the interfacial water layer (IWL) of the mitochondrial membrane. The interaction of those cellular components with the light then leads to the primary responses of increased ROS, ATP production, and intracellular calcium, which ultimately leads to the stimulation of secondary responses that are desired for skin rejuvenation and anti-aging, such as cell proliferation and collagen production. There is controversy surrounding photobiomodulation (PBM), mostly because of the incomplete understanding behind its biochemical mechanism and the number of parameters that require optimization; however, it still poses as a promising field for research into anti-aging properties, as seen in the literature. Besides the use of devices for skin rejuvenation and anti-aging strategies, it is not uncommon to see plant extracts and other natural products being used in current skin care products for the same reason? This is mostly because of their promising bioactivities, some of which include antioxidant, anti-inflammatory, anti-bacterial, collagen-stimulating, and cell-proliferating activities. The aim of this study was to investigate the bio-stimulatory capacity of red light on skin cells and to evaluate possible effects it could have in combination with samples that already show promising anti-aging properties in research. The samples that were selected for this study are: Aspalathus linearis (rooibos) unfermented extract, L-ascorbic acid 2-phosphate, mangrove bee honey, stingless bee honey, Sargassum oligocystum (brown seaweed) and Ulva fasciata (green seaweed).It was found that red light irradiation did indeed stimulate the primary responses of ROS, ATP production, and intracellular calcium levels in HaCaT keratinocytes, as proposed in the hypothesised theory. However, none of the proposed secondary responses to cell proliferation or collagen production were demonstrated. In fact, the opposite was observed for cell proliferation and collagen production, where red light irradiation seemed to be cytostatic towards Hs27 fibroblast cells and caused significant decreases in collagen production. Red light energy dosages of 10, 20 and 30 J/cm2, yielded different primary responses with 20 and 30 J/cm2 generally causing more significant stimulation than that of 10 J/cm2. It should also be noted that even if the desired secondary responses were not observed in this study, it does not mean that red light does not have the capacity to still stimulate them. It is clear that the responses are energy dosage-dependent, and it is suggested that lower energy dosages could possibly lead to cell proliferation and that longer incubation periods post-irradiation are required before measuring the endpoint of collagen production. For the combination of red light irradiation and selected test samples, it was demonstrated that the order of samples that yielded the best outcomes is: stingless bee honey > mangrove bee honey > U. fasciata > S. oligocystum > 2-PAA > green rooibos. Unexpected results were demonstrated for green rooibos in the presence and absence of red light, which included decreased ATP production and collagen biosynthesis. Further investigation is therefore needed to have a better understanding of these unanticipated results. , Thesis (MSc) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
The host potential of wheel-and-axle polyaromatic compounds
- Authors: Vorgers, Jarryd Allister
- Date: 2024-04
- Subjects: Supramolecular chemistry
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64426 , vital:73704
- Description: In this work, wheel-and-axle compounds 1,4-phenylene-bis(diphenylmethanol) (H1), 1,4-phenylene-bis(di-p-tolylmethanol) (H2) and 1,4-phenylene-bis(di-p-fluorophenylmethanol) (H3) were investigated for their host behaviour in various pyridyl and heterocyclic guest mixtures. These host compounds were readily synthesized by means of Grignard addition reactions on dimethyl terephthalate, employing the aryl halides bromobenzene for H1 (73% yield), p-bromotoluene for H2 (69%) and p-bromofluorobenzene for H3 (70%). Molecular modelling calculations demonstrated that the various C-C-C angles differed between the computed low energy host conformers and those in the host molecules from their PYR-containing crystal structures. However, specified ‘torsion’ angles were in close agreement. Compound 1,4-phenylene-bis(diphenylmethanol) (H1) possessed the ability to form 1:2 host-guest (H:G) complexes with each of pyridine (PYR) and 2-, 3- and 4-methylpyridine (2MP, 3MP and 4MP). Furthermore, H1 showed preferential behaviour towards PYR and 4MP when presented with various mixtures of these four pyridines. Due to the high selectivity coefficients calculated in many instances (the selectivity coefficient, K, is a measure of the selectivity of a host compound for one particular guest in a mixture), it was demonstrated that H1 would be suitable for separations/purifications for many of the mixtures investigated in this work through host-guest chemistry strategies. (These pyridines are difficult to separate by means of the more conventional fractional distillations because of very similar boiling points.) Single crystal X-ray diffraction (SCXRD) analyses revealed that 4MP and 3MP experienced hydrogen bonds with the host molecule which were similar in distance, while the hydrogen bond distance between H1 and 4MP was shorter than that between H1 and 2MP. Furthermore, the hydrogen bond angles in complexes with the preferred PYR and 4MP guest species were more linear than in those having 2MP and 3MP. Additionally, preferred PYR and 4MP experienced significant π‧‧‧π contacts with nearby guest molecules, while disfavoured 2MP and 3MP did not interact in this fashion. Hirshfeld surface analyses demonstrated that PYR and 4MP (favoured) were involved in a greater percentage of (guest)N‧‧H(host) , Thesis (MSc) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Vorgers, Jarryd Allister
- Date: 2024-04
- Subjects: Supramolecular chemistry
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/64426 , vital:73704
- Description: In this work, wheel-and-axle compounds 1,4-phenylene-bis(diphenylmethanol) (H1), 1,4-phenylene-bis(di-p-tolylmethanol) (H2) and 1,4-phenylene-bis(di-p-fluorophenylmethanol) (H3) were investigated for their host behaviour in various pyridyl and heterocyclic guest mixtures. These host compounds were readily synthesized by means of Grignard addition reactions on dimethyl terephthalate, employing the aryl halides bromobenzene for H1 (73% yield), p-bromotoluene for H2 (69%) and p-bromofluorobenzene for H3 (70%). Molecular modelling calculations demonstrated that the various C-C-C angles differed between the computed low energy host conformers and those in the host molecules from their PYR-containing crystal structures. However, specified ‘torsion’ angles were in close agreement. Compound 1,4-phenylene-bis(diphenylmethanol) (H1) possessed the ability to form 1:2 host-guest (H:G) complexes with each of pyridine (PYR) and 2-, 3- and 4-methylpyridine (2MP, 3MP and 4MP). Furthermore, H1 showed preferential behaviour towards PYR and 4MP when presented with various mixtures of these four pyridines. Due to the high selectivity coefficients calculated in many instances (the selectivity coefficient, K, is a measure of the selectivity of a host compound for one particular guest in a mixture), it was demonstrated that H1 would be suitable for separations/purifications for many of the mixtures investigated in this work through host-guest chemistry strategies. (These pyridines are difficult to separate by means of the more conventional fractional distillations because of very similar boiling points.) Single crystal X-ray diffraction (SCXRD) analyses revealed that 4MP and 3MP experienced hydrogen bonds with the host molecule which were similar in distance, while the hydrogen bond distance between H1 and 4MP was shorter than that between H1 and 2MP. Furthermore, the hydrogen bond angles in complexes with the preferred PYR and 4MP guest species were more linear than in those having 2MP and 3MP. Additionally, preferred PYR and 4MP experienced significant π‧‧‧π contacts with nearby guest molecules, while disfavoured 2MP and 3MP did not interact in this fashion. Hirshfeld surface analyses demonstrated that PYR and 4MP (favoured) were involved in a greater percentage of (guest)N‧‧H(host) , Thesis (MSc) -- Faculty of Science, School of Biomolecular & Chemical Sciences, 2024
- Full Text:
- Date Issued: 2024-04
The impact of Basel III higher capital and liquidity requirements on the profitability of South African banks
- Authors: Mdandalaza, Zuko Ludwig
- Date: 2024-04
- Subjects: Corporations -- Finance -- South Africa , Corporate governance -- Law and legislation -- South Africa , Banks and banking -- South Africa
- Language: English
- Type: Doctorate , text
- Identifier: http://hdl.handle.net/10948/62355 , vital:72614
- Description: This study employs a robust quantitative research design meticulously tailored to investigate the nuanced impact of Basel III capital and liquidity requirements on the profitability of South African banks. The data collection process is anchored in a rigorous approach, driven by the acquisition and meticulous review of financial statements sourced from a carefully curated sample of South Africa’s banks. Ensuring the sample’s representativeness is of paramount importance for bolstering the study’s findings. To this end, a purposive sampling technique, distinguished for its deliberate selection methodology, was applied judiciously. This method yielded the selection of 10 banks, chosen carefully to encapsulate a cross-section of the South African banking landscape, so enhancing the research’s validity and robustness. The analysis of this intricate dataset is underpinned by advanced statistical techniques, with regression analysis the principal analytical tool. Specifically, the study harnesses the Arellano-Bond generalised method of moments (GMM), a sophisticated yet versatile statistical methodology appropriate for disentangling complex relationships in longitudinal data. This analytical approach is perfectly suited to trace the nuanced interactions between Basel III’s capital and liquidity requirements and the profitability trajectories of South African banks. Spanning a 12- year timeframe, 2010 to 2022, this study attempts to encapsulate the evolution of the banking landscape in the wake of Basel III’s implementation. This extensive temporal scope enables the research to capture both short-term fluctuations and long-term trends, enriching its insights and lending depth to the analysis. The first objective of this study was to unravel the intricate web of macro-specific and bank-specific factors influencing the profitability of banks in South Africa. Net interest margin (NIM), a pivotal metric reflecting bank profitability and efficiency, was central to the investigation. Empirical insights gleaned from the analysis revealed several key determinants of NIM for South African banks. Notably, NIM displayed a high degree of persistence over time. This suggests that South African banks do not adjust swiftly to changes in market conditions, emphasising the importance for bank managers of considering the long-term repercussions of their decisions on interest, income and expenses. The results also illuminated a set of critical variables closely linked to NIM. These include credit loss, non-interest income, market concentration, stability (Z-score) and inflation. These variables collectively underscored the banks’ ability to navigate the multi-faceted landscape of risks and uncertainties in the banking sector, including credit risk, operational risk, market risk and inflationrisk. The positive relationship between these variables and NIM indicated the banks’ adeptness at passing on costs and risks to customers through higher interest rates or fees, all while leveraging their market power and diversification strategies. Conversely, a negative and significant association emerged between NIM and bank size, GDP per capita, private credit and the repo rate. These variables underscored the competitive pressure and macroeconomic dynamics influencing the demand for and supply of credit in the banking sector. In this context, the negative relationship suggested that larger banks, those operating in more developed and competitive markets, and those encountering lower policy rates, tend to exhibit lower NIM. These banks, due to heightened competition and lower demand for credit, face diminished interest income and narrower margins. Notably, variables like cost-to-income ratio, funding structure and loan-to-deposit ratio did not emerge as significant in explaining NIM for South African banks. This implies that these variables exert a relatively weaker influence on the profitability and efficiency of South African banks, or that their effects are subsumed by other variables in the model. The second objective examined the effect of higher capital buffers on bank profitability. Empirical findings revealed a negative yet statistically insignificant co-efficient for the CET1 variable in the regression analysis. This observation indicated that there is no substantial relationship between Basel III Tier 1 capital ratio (CET1) and bank profitability, as measured by NIM, among South African banks. This suggests that Basel III capital requirements do not have a significant influence on the profitability and efficiency of these banks, or their effect varies depending on other bank-specific or macroeconomic variables. The third objective focused on the effect of Basel III liquidity regulations, epitomised by the liquidity coverage ratio (LCR), on bank profitability in South Africa. Empirical results revealed a negative but statistically insignificant relationship between LCR and NIM. This observation indicates that Basel III liquidity regulations exert no discernible effect on the net interest income of South African banks. This finding could be attributed to the fact that South African banks had already fortified their liquidity positions prior to Basel III implementation, adhering to stringent regulatory requirements and prudent liquidity management practices. As a result, the introduction of LCR did not pose a significant alteration or constraint on the liquidity standing and profitability of South African banks. It also implies that other factors, like market conditions, funding structures or asset compositions, play more pivotal roles than the LCR in shaping the profitability of South African banks. These factors may influence the net interest spread, cost of funds or risk-adjusted returns of these banks. , Thesis (PhD) -- Faculty of Economics and Management Sciences, School of Economics, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Mdandalaza, Zuko Ludwig
- Date: 2024-04
- Subjects: Corporations -- Finance -- South Africa , Corporate governance -- Law and legislation -- South Africa , Banks and banking -- South Africa
- Language: English
- Type: Doctorate , text
- Identifier: http://hdl.handle.net/10948/62355 , vital:72614
- Description: This study employs a robust quantitative research design meticulously tailored to investigate the nuanced impact of Basel III capital and liquidity requirements on the profitability of South African banks. The data collection process is anchored in a rigorous approach, driven by the acquisition and meticulous review of financial statements sourced from a carefully curated sample of South Africa’s banks. Ensuring the sample’s representativeness is of paramount importance for bolstering the study’s findings. To this end, a purposive sampling technique, distinguished for its deliberate selection methodology, was applied judiciously. This method yielded the selection of 10 banks, chosen carefully to encapsulate a cross-section of the South African banking landscape, so enhancing the research’s validity and robustness. The analysis of this intricate dataset is underpinned by advanced statistical techniques, with regression analysis the principal analytical tool. Specifically, the study harnesses the Arellano-Bond generalised method of moments (GMM), a sophisticated yet versatile statistical methodology appropriate for disentangling complex relationships in longitudinal data. This analytical approach is perfectly suited to trace the nuanced interactions between Basel III’s capital and liquidity requirements and the profitability trajectories of South African banks. Spanning a 12- year timeframe, 2010 to 2022, this study attempts to encapsulate the evolution of the banking landscape in the wake of Basel III’s implementation. This extensive temporal scope enables the research to capture both short-term fluctuations and long-term trends, enriching its insights and lending depth to the analysis. The first objective of this study was to unravel the intricate web of macro-specific and bank-specific factors influencing the profitability of banks in South Africa. Net interest margin (NIM), a pivotal metric reflecting bank profitability and efficiency, was central to the investigation. Empirical insights gleaned from the analysis revealed several key determinants of NIM for South African banks. Notably, NIM displayed a high degree of persistence over time. This suggests that South African banks do not adjust swiftly to changes in market conditions, emphasising the importance for bank managers of considering the long-term repercussions of their decisions on interest, income and expenses. The results also illuminated a set of critical variables closely linked to NIM. These include credit loss, non-interest income, market concentration, stability (Z-score) and inflation. These variables collectively underscored the banks’ ability to navigate the multi-faceted landscape of risks and uncertainties in the banking sector, including credit risk, operational risk, market risk and inflationrisk. The positive relationship between these variables and NIM indicated the banks’ adeptness at passing on costs and risks to customers through higher interest rates or fees, all while leveraging their market power and diversification strategies. Conversely, a negative and significant association emerged between NIM and bank size, GDP per capita, private credit and the repo rate. These variables underscored the competitive pressure and macroeconomic dynamics influencing the demand for and supply of credit in the banking sector. In this context, the negative relationship suggested that larger banks, those operating in more developed and competitive markets, and those encountering lower policy rates, tend to exhibit lower NIM. These banks, due to heightened competition and lower demand for credit, face diminished interest income and narrower margins. Notably, variables like cost-to-income ratio, funding structure and loan-to-deposit ratio did not emerge as significant in explaining NIM for South African banks. This implies that these variables exert a relatively weaker influence on the profitability and efficiency of South African banks, or that their effects are subsumed by other variables in the model. The second objective examined the effect of higher capital buffers on bank profitability. Empirical findings revealed a negative yet statistically insignificant co-efficient for the CET1 variable in the regression analysis. This observation indicated that there is no substantial relationship between Basel III Tier 1 capital ratio (CET1) and bank profitability, as measured by NIM, among South African banks. This suggests that Basel III capital requirements do not have a significant influence on the profitability and efficiency of these banks, or their effect varies depending on other bank-specific or macroeconomic variables. The third objective focused on the effect of Basel III liquidity regulations, epitomised by the liquidity coverage ratio (LCR), on bank profitability in South Africa. Empirical results revealed a negative but statistically insignificant relationship between LCR and NIM. This observation indicates that Basel III liquidity regulations exert no discernible effect on the net interest income of South African banks. This finding could be attributed to the fact that South African banks had already fortified their liquidity positions prior to Basel III implementation, adhering to stringent regulatory requirements and prudent liquidity management practices. As a result, the introduction of LCR did not pose a significant alteration or constraint on the liquidity standing and profitability of South African banks. It also implies that other factors, like market conditions, funding structures or asset compositions, play more pivotal roles than the LCR in shaping the profitability of South African banks. These factors may influence the net interest spread, cost of funds or risk-adjusted returns of these banks. , Thesis (PhD) -- Faculty of Economics and Management Sciences, School of Economics, 2024
- Full Text:
- Date Issued: 2024-04
The impact of South Africa's sale of weapons to Saudi Arabia : the case of Yemen
- Authors: Mekuto, Phumelela
- Date: 2024-04
- Subjects: Conflict management , Military weapons , International relations
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63334 , vital:73258
- Description: Since the start of the Yemeni conflict in 2014, both the Saudi-led military and the Iranian-backed Houthi Rebel group have launched missile airstrikes across the nation (Sharp & Brudnick, 2015). These attacks are carried out using high-tech military tools, such as drones, aircraft, bombs, and other weapons. According to Hokayem (2016), nearly 24 million Yemenis require aid as Yemen experiences the world’s largest humanitarian crises. Open Secretes released a report in 2020 outlining that weapons used in the war in Yemen could be traced back to Denel, alluding to its role and complicity in the conflict. The aim of this study is to investigate the role of Denel in the conflict in Yemen and its socio-economic effects. In doing so, South Africa’s trade relations with the Saudi-Arabia will be explored. In addition, unpacking the socio-economic conditions that exists domestically and internationally that influence global arms trade. A qualitative research approach is employed. Secondary research analysis is conducted using government publications, international policy reports, books, journals, and newspaper articles. In addressing the social aspect of the arms trade effects, the humanitarian component uses a psycho-social theoretical framework which encompasses Burtons’ human needs theory. In addition to this main theory, the frustration-aggression theory as well as the relative deprivation theory were applied to support the theory central to the study. Fundamental to this study is understanding Denel’s’ complicity in the conflict in Yemen and the effects thereof. This stems from the company’s trade agreements between itself and Saudi Arabia, which has been at the forefront of multiple proxy wars within the region. Denel’s implied complicity stems from the correlation between the heightened period of conflict in the Yemen and the parastatal’s record-breaking order book during the same period. The research study focuses on the period between 2013 – 2016. Further research has been conducted in order to provide a comprehensive historical account and context of the conflict and the role of Denel as a parastatal organisation. Furthermore, this study delves into ongoing crises and the volatile nature of global arms trade regulations. It is for the reasons alluded to above that the study insists on not limiting period of the study to 2013 – 2016. The study findings suggest that although weapons used in the conflict in Yemen could be traced back to Denel, these were insignificant to the overall contribution to the conflict in Yemen, despite South Africa’s and Saudi Arabia’s breach of the End-User agreement. As a result of Saudi Arabia’s continued infringement of human rights, the state was not to be sold weapons as they are proven to have further ramifications against the protection of human rights. Moreover, the arms trade industry partially functions independently from government intervention and regulation, making it increasingly difficult to implement international policy. What is of paramount importance is the direct effect of conflict on innocent civilians who continue to suffer and the human cost of profit and the struggle for power and resources. Recommendations highlighted in the treatise include striking a balance between profitability and the humanitarian perspective by taking into consideration both private sector profit motives and the public sector's responsibility to prioritise human rights and the well-being of people. This approach ensures efficient management of Denel and reduces the possibility of privatization, as Denel remains the lifeline of the South African Defense Force (SADF). To ensure compliance with domestic and international arms treaty regulations, it is necessary to enforce a stricter process for arms sales justification. The agreement should incorporate legal measures that enable the prosecution of the state in cases where irregularities in weapons sales approval, including corruption or personal/political motives, are identified. The study recommends that Denel should initiate a strategic restructuring plan to revitalise its business model and leadership development. This restructuring should prioritise ethical business practices, legality, and vetting of customer information while ensuring profitability for self-sustainability. Addressing irregular sale agreements is crucial before investing in technology advancement and research. Growth assessment should be based on profit margins and order book prospects to ensure business optimisation and resource adequacy. Denel's success is vital for South Africa's GDP growth. , Thesis (MA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2024
- Full Text:
- Date Issued: 2024-04
- Authors: Mekuto, Phumelela
- Date: 2024-04
- Subjects: Conflict management , Military weapons , International relations
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/63334 , vital:73258
- Description: Since the start of the Yemeni conflict in 2014, both the Saudi-led military and the Iranian-backed Houthi Rebel group have launched missile airstrikes across the nation (Sharp & Brudnick, 2015). These attacks are carried out using high-tech military tools, such as drones, aircraft, bombs, and other weapons. According to Hokayem (2016), nearly 24 million Yemenis require aid as Yemen experiences the world’s largest humanitarian crises. Open Secretes released a report in 2020 outlining that weapons used in the war in Yemen could be traced back to Denel, alluding to its role and complicity in the conflict. The aim of this study is to investigate the role of Denel in the conflict in Yemen and its socio-economic effects. In doing so, South Africa’s trade relations with the Saudi-Arabia will be explored. In addition, unpacking the socio-economic conditions that exists domestically and internationally that influence global arms trade. A qualitative research approach is employed. Secondary research analysis is conducted using government publications, international policy reports, books, journals, and newspaper articles. In addressing the social aspect of the arms trade effects, the humanitarian component uses a psycho-social theoretical framework which encompasses Burtons’ human needs theory. In addition to this main theory, the frustration-aggression theory as well as the relative deprivation theory were applied to support the theory central to the study. Fundamental to this study is understanding Denel’s’ complicity in the conflict in Yemen and the effects thereof. This stems from the company’s trade agreements between itself and Saudi Arabia, which has been at the forefront of multiple proxy wars within the region. Denel’s implied complicity stems from the correlation between the heightened period of conflict in the Yemen and the parastatal’s record-breaking order book during the same period. The research study focuses on the period between 2013 – 2016. Further research has been conducted in order to provide a comprehensive historical account and context of the conflict and the role of Denel as a parastatal organisation. Furthermore, this study delves into ongoing crises and the volatile nature of global arms trade regulations. It is for the reasons alluded to above that the study insists on not limiting period of the study to 2013 – 2016. The study findings suggest that although weapons used in the conflict in Yemen could be traced back to Denel, these were insignificant to the overall contribution to the conflict in Yemen, despite South Africa’s and Saudi Arabia’s breach of the End-User agreement. As a result of Saudi Arabia’s continued infringement of human rights, the state was not to be sold weapons as they are proven to have further ramifications against the protection of human rights. Moreover, the arms trade industry partially functions independently from government intervention and regulation, making it increasingly difficult to implement international policy. What is of paramount importance is the direct effect of conflict on innocent civilians who continue to suffer and the human cost of profit and the struggle for power and resources. Recommendations highlighted in the treatise include striking a balance between profitability and the humanitarian perspective by taking into consideration both private sector profit motives and the public sector's responsibility to prioritise human rights and the well-being of people. This approach ensures efficient management of Denel and reduces the possibility of privatization, as Denel remains the lifeline of the South African Defense Force (SADF). To ensure compliance with domestic and international arms treaty regulations, it is necessary to enforce a stricter process for arms sales justification. The agreement should incorporate legal measures that enable the prosecution of the state in cases where irregularities in weapons sales approval, including corruption or personal/political motives, are identified. The study recommends that Denel should initiate a strategic restructuring plan to revitalise its business model and leadership development. This restructuring should prioritise ethical business practices, legality, and vetting of customer information while ensuring profitability for self-sustainability. Addressing irregular sale agreements is crucial before investing in technology advancement and research. Growth assessment should be based on profit margins and order book prospects to ensure business optimisation and resource adequacy. Denel's success is vital for South Africa's GDP growth. , Thesis (MA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2024
- Full Text:
- Date Issued: 2024-04