Characterising termite mound spatial patterns in the Eastern Cape Karoo : applying drone remote sensing,GIS and spatial statistics
- Mngcele, Lizalise Sive Nqaba
- Authors: Mngcele, Lizalise Sive Nqaba
- Date: 2022-12
- Subjects: Drone aircraft in remote sensing – Eastern Cape Karoo , Termites , Geographic information Systems – South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59555 , vital:62169
- Description: The Eastern Cape Karoo in South Africa has been earmarked for potential Shale Gas development, which has necessitated the understanding of existing ecosystems to be quantiĄed pre-development, in order to have a baseline against which the exploration can be monitored. Termite mounds as baseline mechanisms, are known to be sensitive to ecosystem disturbance and because of their abundance in the exploration zone, have been studied as indicator species. They are both a surface and subsurface phenomena which makes them an ideal baseline monitoring mechanism. Termite mound height, basal circumference and geospatial data was collected against natural and anthropogenic factors: elevation, vegetation, water, soil, geology, human settlements and roads. Mound distributions were observed across four study sites, and seven plots, using a DJI Phantom 4 Pro drone, an aerial and ground survey. Observed mound data on the drone and aerial survey was compared to that of the ground survey. Overall, the drone survey outperformed the aerial survey in recording accurate termite mound data. This was largely attributed to the scale of the study which gave the drone a competitive advantage. It allowed for drone data to be collected at 40 m altitude with an image resolution of 2-6 cm/pixel on each plot. In addition, drone detection accuracy was improved through the ability to generate digital surface models (DSMs) through point clouds and overlaying them with orthomosaics. Considering observed mound spatial point patterns, both the drone and aerial survey were more than 50% percent consistent with the ground survey, although the drone survey detected 28.57% more accurate mound spatial point patterns than the aerial survey. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Mngcele, Lizalise Sive Nqaba
- Date: 2022-12
- Subjects: Drone aircraft in remote sensing – Eastern Cape Karoo , Termites , Geographic information Systems – South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59555 , vital:62169
- Description: The Eastern Cape Karoo in South Africa has been earmarked for potential Shale Gas development, which has necessitated the understanding of existing ecosystems to be quantiĄed pre-development, in order to have a baseline against which the exploration can be monitored. Termite mounds as baseline mechanisms, are known to be sensitive to ecosystem disturbance and because of their abundance in the exploration zone, have been studied as indicator species. They are both a surface and subsurface phenomena which makes them an ideal baseline monitoring mechanism. Termite mound height, basal circumference and geospatial data was collected against natural and anthropogenic factors: elevation, vegetation, water, soil, geology, human settlements and roads. Mound distributions were observed across four study sites, and seven plots, using a DJI Phantom 4 Pro drone, an aerial and ground survey. Observed mound data on the drone and aerial survey was compared to that of the ground survey. Overall, the drone survey outperformed the aerial survey in recording accurate termite mound data. This was largely attributed to the scale of the study which gave the drone a competitive advantage. It allowed for drone data to be collected at 40 m altitude with an image resolution of 2-6 cm/pixel on each plot. In addition, drone detection accuracy was improved through the ability to generate digital surface models (DSMs) through point clouds and overlaying them with orthomosaics. Considering observed mound spatial point patterns, both the drone and aerial survey were more than 50% percent consistent with the ground survey, although the drone survey detected 28.57% more accurate mound spatial point patterns than the aerial survey. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Co-development of online violence against women and girls prevention interventions with school-going adolescents
- Authors: Ndungu, Jane
- Date: 2022-12
- Subjects: Prevention , Transformative communication
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/60188 , vital:63214
- Description: Background: Violence against women and girls (VAWG)amongst adolescents remains a global public health problem. Globally, an estimated 24 per cent of girls aged 15-19 are reported to have experienced VAWG before the age of 20. Experience of VAWG has far reaching health and educational consequences. Thus, the prevention of VAWG needs to be a priority. In recent years, there has been an increase in web-based or online violence prevention interventions. However, these interventions are either secondary prevention interventions, or primary prevention interventions, focused on emergency or protective solutions. Current evidence indicates that group-based participatory violence prevention interventions are an important approach to the primary prevention of VAWG but there remains a gap in understanding if these interventions can be delivered online. Further, it remains unclear if co-development of group-based participatory violence prevention interventions with young people – which has been proposed to enhance contextualisation of interventions – can occur online. Goal and specific objectives: This study aimed to explore and understand the feasibility of co-developing an online group-based participatory VAWG prevention intervention for adolescents. The specific objectives of this study were (i) from the perspective of experts understand the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online, (ii) from the perspective of adolescents, understand the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online and (iii) Undertake an online co-development process of an online group-based participatory VAWG prevention intervention with adolescents. ix Methods: This qualitative study was conducted in Gqeberha (formerly known as Port Elizabeth), in the Nelson Mandela Bay municipality, Eastern Cape Province of South Africa. The study was guided by the intervention development framework: 6 Essential Steps for Quality Intervention Development (6SQuID). Data were collected online using in-depth semi-structured interviews, with 20 experts sampled through convenience and snowball strategies and 18 purposively sampled adolescents, to achieve objectives one and two. This was then followed by a co-development process with high school-going adolescents (ages 18- 19 years) to achieve objective three. In the co-development process, the candidate worked with a small group of adolescents (four adolescents) for five sessions online, over a period of two weeks. In these sessions, the co-development team engaged in discussions on sexual violence, which resulted in creation of a problem tree and populated a theory of change table. Data were transcribed in English, verbatim and analysed using thematic network analyses. Findings: Findings for the first objective about understanding from the perspective of experts the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online, showed experts identified several opportunities for these. Specifically, experts identified the potential of bringing these interventions to scale, which has been a challenge for in-person interventions, as well as accessing hard to reach groups, such as people in conflict settings, those on the move and people with limited mobility. However, experts felt there were many complex questions in the development of an online VAWG prevention intervention that needed resolving. Some of the challenges raised by experts included concerns of achieving privacy, trust, and safety online, which are central to achieving transformative communication. Experts also struggled to grapple with how a sense of community could be achieved online. There were also concerns amongst experts about material challenges such as access to devices, access to data and poor connectivity. x Interestingly, younger experts were more open to online participatory interventions than the more experienced experts. Findings for objective two “from the perspective of adolescents, understand the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online”, young people reported they were keen and open to the idea of online group-based participatory VAWG prevention interventions. They discussed how they enjoyed engaging in online groups and often experienced a sense of belonging in these groups. Yet, like the experts, school-going adolescents were concerned about safety, privacy, and trust in online groups. These concerns shaped adolescents’ willingness to disclose sensitive information online and ability to engage in open dialogue. Concern over privacy, trust and safety online also influenced adolescents’ choices over which apps to engage with, and with whom. Young people were active in thinking through and addressing how they dealt with safety, privacy and trust issues online. The third objective was “to undertake an online co-development process of an online group-based participatory VAWG prevention intervention with adolescents”, which was done over two weeks. A range of positive outcomes were identified. Firstly, young people enjoyed the level of autonomy and their depth of involvement in the process. They had come into the process anticipating being lectured to and were pleasantly surprised to find that their role was central, and they would drive the process. Secondly, adolescents were eager to be involved and appreciated being ‘heard’. This allowed for a more extensive exploration of their understanding on the topic, and development of the intervention activities that emerged. Thirdly, young people found it easy to build rapport online, both amongst each other, and with the facilitator, which made communication in the group easier. Importantly, this group of adolescents had their own laptops, or cell phones to use, and the project provided data for the young people to participate. However, there were also challenges to the process of coxi development. The central challenge was that young people and facilitator often slipped into a form of teacher-learner communication, driven by their prior histories of didactic education, which led the adolescents to ‘fearing’ to give ‘wrong’ responses. The facilitator also struggled on how to maintain adolescents’ autonomy of thought, while also incorporating ‘scientific evidence’ in the emerging intervention activities. Furthermore, the more talkative school-going adolescents took the centre stage in the discussions, with the quieter ones remaining quiet. Conclusions: The findings of this study showed that the feasibility of taking group-based participatory interventions online are possible, but this is shaped by a complex set of factors, that impact on the possibilities for transformative communication, and on the creation of safe social spaces – such as trust, privacy, safety. The central question is whether the theoretical constructs of transformative communication and safe social spaces are achievable online. A significant step in moving towards enabling transformative communication online will be addressing the issues of privacy, safety and trust. Careful training of facilitators around skills to facilitate group-based participatory VAWG prevention interventions online is also recommended. The complexities of delivering online participatory interventions require careful consideration, and this needs to be developed and thought about in conjunction with school-going adolescents (the target group), to ensure that interventions resonate with their needs and requirements. Future directions in this research field are provided. , Thesis (PhD) -- Faculty of Health Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Ndungu, Jane
- Date: 2022-12
- Subjects: Prevention , Transformative communication
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/60188 , vital:63214
- Description: Background: Violence against women and girls (VAWG)amongst adolescents remains a global public health problem. Globally, an estimated 24 per cent of girls aged 15-19 are reported to have experienced VAWG before the age of 20. Experience of VAWG has far reaching health and educational consequences. Thus, the prevention of VAWG needs to be a priority. In recent years, there has been an increase in web-based or online violence prevention interventions. However, these interventions are either secondary prevention interventions, or primary prevention interventions, focused on emergency or protective solutions. Current evidence indicates that group-based participatory violence prevention interventions are an important approach to the primary prevention of VAWG but there remains a gap in understanding if these interventions can be delivered online. Further, it remains unclear if co-development of group-based participatory violence prevention interventions with young people – which has been proposed to enhance contextualisation of interventions – can occur online. Goal and specific objectives: This study aimed to explore and understand the feasibility of co-developing an online group-based participatory VAWG prevention intervention for adolescents. The specific objectives of this study were (i) from the perspective of experts understand the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online, (ii) from the perspective of adolescents, understand the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online and (iii) Undertake an online co-development process of an online group-based participatory VAWG prevention intervention with adolescents. ix Methods: This qualitative study was conducted in Gqeberha (formerly known as Port Elizabeth), in the Nelson Mandela Bay municipality, Eastern Cape Province of South Africa. The study was guided by the intervention development framework: 6 Essential Steps for Quality Intervention Development (6SQuID). Data were collected online using in-depth semi-structured interviews, with 20 experts sampled through convenience and snowball strategies and 18 purposively sampled adolescents, to achieve objectives one and two. This was then followed by a co-development process with high school-going adolescents (ages 18- 19 years) to achieve objective three. In the co-development process, the candidate worked with a small group of adolescents (four adolescents) for five sessions online, over a period of two weeks. In these sessions, the co-development team engaged in discussions on sexual violence, which resulted in creation of a problem tree and populated a theory of change table. Data were transcribed in English, verbatim and analysed using thematic network analyses. Findings: Findings for the first objective about understanding from the perspective of experts the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online, showed experts identified several opportunities for these. Specifically, experts identified the potential of bringing these interventions to scale, which has been a challenge for in-person interventions, as well as accessing hard to reach groups, such as people in conflict settings, those on the move and people with limited mobility. However, experts felt there were many complex questions in the development of an online VAWG prevention intervention that needed resolving. Some of the challenges raised by experts included concerns of achieving privacy, trust, and safety online, which are central to achieving transformative communication. Experts also struggled to grapple with how a sense of community could be achieved online. There were also concerns amongst experts about material challenges such as access to devices, access to data and poor connectivity. x Interestingly, younger experts were more open to online participatory interventions than the more experienced experts. Findings for objective two “from the perspective of adolescents, understand the feasibility, acceptability and challenges of a group-based participatory VAWG prevention intervention developed and delivered online”, young people reported they were keen and open to the idea of online group-based participatory VAWG prevention interventions. They discussed how they enjoyed engaging in online groups and often experienced a sense of belonging in these groups. Yet, like the experts, school-going adolescents were concerned about safety, privacy, and trust in online groups. These concerns shaped adolescents’ willingness to disclose sensitive information online and ability to engage in open dialogue. Concern over privacy, trust and safety online also influenced adolescents’ choices over which apps to engage with, and with whom. Young people were active in thinking through and addressing how they dealt with safety, privacy and trust issues online. The third objective was “to undertake an online co-development process of an online group-based participatory VAWG prevention intervention with adolescents”, which was done over two weeks. A range of positive outcomes were identified. Firstly, young people enjoyed the level of autonomy and their depth of involvement in the process. They had come into the process anticipating being lectured to and were pleasantly surprised to find that their role was central, and they would drive the process. Secondly, adolescents were eager to be involved and appreciated being ‘heard’. This allowed for a more extensive exploration of their understanding on the topic, and development of the intervention activities that emerged. Thirdly, young people found it easy to build rapport online, both amongst each other, and with the facilitator, which made communication in the group easier. Importantly, this group of adolescents had their own laptops, or cell phones to use, and the project provided data for the young people to participate. However, there were also challenges to the process of coxi development. The central challenge was that young people and facilitator often slipped into a form of teacher-learner communication, driven by their prior histories of didactic education, which led the adolescents to ‘fearing’ to give ‘wrong’ responses. The facilitator also struggled on how to maintain adolescents’ autonomy of thought, while also incorporating ‘scientific evidence’ in the emerging intervention activities. Furthermore, the more talkative school-going adolescents took the centre stage in the discussions, with the quieter ones remaining quiet. Conclusions: The findings of this study showed that the feasibility of taking group-based participatory interventions online are possible, but this is shaped by a complex set of factors, that impact on the possibilities for transformative communication, and on the creation of safe social spaces – such as trust, privacy, safety. The central question is whether the theoretical constructs of transformative communication and safe social spaces are achievable online. A significant step in moving towards enabling transformative communication online will be addressing the issues of privacy, safety and trust. Careful training of facilitators around skills to facilitate group-based participatory VAWG prevention interventions online is also recommended. The complexities of delivering online participatory interventions require careful consideration, and this needs to be developed and thought about in conjunction with school-going adolescents (the target group), to ensure that interventions resonate with their needs and requirements. Future directions in this research field are provided. , Thesis (PhD) -- Faculty of Health Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Comparison of in vitro activities of selected Ganoderma species in relation to skin diseases
- Authors: Van Aardt, Robin Kaylah
- Date: 2022-12
- Subjects: Ganoderma diseases of plants -- South Africa , Macrophages
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/61143 , vital:69766
- Description: Ganoderma species of macrofungi have been reported to have a multitude of medicinal properties, however, there is limited information on this genus in South Africa. The goal of this study was to compare biological activities of selected Ganoderma spp. in relation to skin diseases with emphasis on the antibacterial, antioxidant, anti-inflammatory and cytotoxic in vitro activities. Ethanolic and aqueous extracts prepared from six samples of G. lucidum [two commercial products (MG-LZ8 and Medi Mushroom Reishi extract), polar, antler, fruiting body and mycelium] and ten cultivated Ganoderma spp. were screened for bioactivities. Antibacterial activity was assessed using the 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium (INT) assay against skin pathogens (Staphylococcus aureus, Streptococcus pyogenes, Pseudomonas aeruginosa, Escherichia coli and Klebsiella pneumoniae). Cytotoxicity was determined using bisBenzamide H 33342 trihydrochloride/propidium iodide (Hoechst/ PI) staining on the B16F10 melanoma cell line. The 2,2-Diphenyl-1- picrylhydrazyl (DPPH) and Ferric reducing ability of plasma (FRAP) assays were used to investigate antioxidant activity. Immune modulatory effects included detection of phagocytic activity and phenotypic changes of RAW 264.7 murine macrophage cells. The phenotypic macrophage polarisation of the extracts on RAW 264.7 murine macrophage cells was tested by treating the cells with the extracts and measuring the fluorescence of cell surface markers. CD86 was used as indicator for the M1 phenotype and CD206 as a general marker for M2 phenotypes. The commercially available and cultivated G. lucidum extracts did not show antibacterial activity within the 0-2mg/mL concentration range tested. The commercially available MG-LZ8 G. lucidum extract expressed cytotoxic activity with an IC50 value of 21.26 µg/mL while the ethanolic conk fruiting body and mycelial G. lucidum extract showed a significant reduction in live cells, indicating anti-proliferative activity. G. destructans mycelial ethanol extract displayed anti-proliferative activity at a concentration of 200 μg/mL which shows great potential as a mycelial extract. All the G. lucidum extracts exhibited free radical scavenging abilities with the Ganoderma spp. showing little to no measurable activity. G. lucidum and Ganoderma spp extracts had similar responses without inflammatory activity for the concentration ranges tested. The extracts did not increase macrophage phagocytic activity using the pHrodo™ Green E. coli iii BioParticles™ Conjugate. G. lucidum and Ganoderma spp. extracts induced macrophage polarisation toward the M2 phenotype, with the G. lucidum antler and conk fruiting body extracts displaying significant activity. This study illustrates one of the first investigations of the bioactivity of indigenous Ganoderma spp.; G. destructans type and G. eickeri, spp. nov. identified by Coeztee et al (2015). , Thesis (MSc) -- Faculty of Science, School of Biochemistry and Microbiology, 2023
- Full Text:
- Date Issued: 2022-12
- Authors: Van Aardt, Robin Kaylah
- Date: 2022-12
- Subjects: Ganoderma diseases of plants -- South Africa , Macrophages
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/61143 , vital:69766
- Description: Ganoderma species of macrofungi have been reported to have a multitude of medicinal properties, however, there is limited information on this genus in South Africa. The goal of this study was to compare biological activities of selected Ganoderma spp. in relation to skin diseases with emphasis on the antibacterial, antioxidant, anti-inflammatory and cytotoxic in vitro activities. Ethanolic and aqueous extracts prepared from six samples of G. lucidum [two commercial products (MG-LZ8 and Medi Mushroom Reishi extract), polar, antler, fruiting body and mycelium] and ten cultivated Ganoderma spp. were screened for bioactivities. Antibacterial activity was assessed using the 2-(4-iodophenyl)-3-(4-nitrophenyl)-5-phenyl-2H-tetrazolium (INT) assay against skin pathogens (Staphylococcus aureus, Streptococcus pyogenes, Pseudomonas aeruginosa, Escherichia coli and Klebsiella pneumoniae). Cytotoxicity was determined using bisBenzamide H 33342 trihydrochloride/propidium iodide (Hoechst/ PI) staining on the B16F10 melanoma cell line. The 2,2-Diphenyl-1- picrylhydrazyl (DPPH) and Ferric reducing ability of plasma (FRAP) assays were used to investigate antioxidant activity. Immune modulatory effects included detection of phagocytic activity and phenotypic changes of RAW 264.7 murine macrophage cells. The phenotypic macrophage polarisation of the extracts on RAW 264.7 murine macrophage cells was tested by treating the cells with the extracts and measuring the fluorescence of cell surface markers. CD86 was used as indicator for the M1 phenotype and CD206 as a general marker for M2 phenotypes. The commercially available and cultivated G. lucidum extracts did not show antibacterial activity within the 0-2mg/mL concentration range tested. The commercially available MG-LZ8 G. lucidum extract expressed cytotoxic activity with an IC50 value of 21.26 µg/mL while the ethanolic conk fruiting body and mycelial G. lucidum extract showed a significant reduction in live cells, indicating anti-proliferative activity. G. destructans mycelial ethanol extract displayed anti-proliferative activity at a concentration of 200 μg/mL which shows great potential as a mycelial extract. All the G. lucidum extracts exhibited free radical scavenging abilities with the Ganoderma spp. showing little to no measurable activity. G. lucidum and Ganoderma spp extracts had similar responses without inflammatory activity for the concentration ranges tested. The extracts did not increase macrophage phagocytic activity using the pHrodo™ Green E. coli iii BioParticles™ Conjugate. G. lucidum and Ganoderma spp. extracts induced macrophage polarisation toward the M2 phenotype, with the G. lucidum antler and conk fruiting body extracts displaying significant activity. This study illustrates one of the first investigations of the bioactivity of indigenous Ganoderma spp.; G. destructans type and G. eickeri, spp. nov. identified by Coeztee et al (2015). , Thesis (MSc) -- Faculty of Science, School of Biochemistry and Microbiology, 2023
- Full Text:
- Date Issued: 2022-12
Converged data and sensing over optical fiber networks
- Authors: Shumane, Vela
- Date: 2022-12
- Subjects: Optical fiber subscriber loops -- South Africa , Chemical detectors , Internet -- Technological innovations
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59968 , vital:62722
- Description: Internet connectivity, data and sensors have become increasingly important across all spheres of business and industry, especially in the mining sector. Recent years have seen deeper mining explorations as a result of the depletion of natural resources in shallow strata. Due to complex and unexpected geological conditions as well as significant ground stresses, deep stratum mining operations encounter a number of difficulties. It is essential that the mining industry be more innovative with their equipment and monitoring systems given the rise in expenses caused by energy consumption, concessions to surface integrity, worldwide freshwater shortage, as well as health and safety of miners. Any attempt to eliminate these mining consequences must start with early discovery. An effective plan to anticipate, prevent, or manage geohazards events must be in place because to these complex and unpredictably occurring geological circumstances. Due to their capacity to combine gigabits of data from remote locations within the mine to a centralized control centre, optical fiber offers a variety of distinctive advantages within the mining industry. In order to attain maximum productivity, modern and effective mining operations use enhanced control techniques and increasing mechanization. Additionally, optical fibers can be utilized in a mine to safely monitor seismic activity, methane, roof collapses, rock bursts, explosions, and dangerous underground mine settings. Multimode or multi-core fibers represent a particularly intriguing alternative for transmissions over small distances, especially for broad band local area networks like LANs, as they enable the use of affordable components. Due to the current state of these issues, there is a drive to create fiber optic communication links that can also function as distributed optical fiber sensors, where each point along the fiber can function as a continuous array of sensors. In this thesis, we suggested and experimentally demonstrated a converged solution for precise vibration sensing and high-speed data in mining applications. With wireless access for people and equipment inside cavities, the solution uses multimode fiber to link nearby mining cavities. To track vibrations and earth tremors causing rock falls, polarization-based vibration sensors over multimode fiber is used. With a modal dispersion penalty of just 1.6 dB, photonic data transmission across 100 m of multimode fiber is successfully accomplished. Successful 1.7 GHz wireless transmission across a distance of 1 m is demonstrated, and vibrations between 50 Hz and 1 kHz may be reliably detected to within 0.02 percent of the true value. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Shumane, Vela
- Date: 2022-12
- Subjects: Optical fiber subscriber loops -- South Africa , Chemical detectors , Internet -- Technological innovations
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59968 , vital:62722
- Description: Internet connectivity, data and sensors have become increasingly important across all spheres of business and industry, especially in the mining sector. Recent years have seen deeper mining explorations as a result of the depletion of natural resources in shallow strata. Due to complex and unexpected geological conditions as well as significant ground stresses, deep stratum mining operations encounter a number of difficulties. It is essential that the mining industry be more innovative with their equipment and monitoring systems given the rise in expenses caused by energy consumption, concessions to surface integrity, worldwide freshwater shortage, as well as health and safety of miners. Any attempt to eliminate these mining consequences must start with early discovery. An effective plan to anticipate, prevent, or manage geohazards events must be in place because to these complex and unpredictably occurring geological circumstances. Due to their capacity to combine gigabits of data from remote locations within the mine to a centralized control centre, optical fiber offers a variety of distinctive advantages within the mining industry. In order to attain maximum productivity, modern and effective mining operations use enhanced control techniques and increasing mechanization. Additionally, optical fibers can be utilized in a mine to safely monitor seismic activity, methane, roof collapses, rock bursts, explosions, and dangerous underground mine settings. Multimode or multi-core fibers represent a particularly intriguing alternative for transmissions over small distances, especially for broad band local area networks like LANs, as they enable the use of affordable components. Due to the current state of these issues, there is a drive to create fiber optic communication links that can also function as distributed optical fiber sensors, where each point along the fiber can function as a continuous array of sensors. In this thesis, we suggested and experimentally demonstrated a converged solution for precise vibration sensing and high-speed data in mining applications. With wireless access for people and equipment inside cavities, the solution uses multimode fiber to link nearby mining cavities. To track vibrations and earth tremors causing rock falls, polarization-based vibration sensors over multimode fiber is used. With a modal dispersion penalty of just 1.6 dB, photonic data transmission across 100 m of multimode fiber is successfully accomplished. Successful 1.7 GHz wireless transmission across a distance of 1 m is demonstrated, and vibrations between 50 Hz and 1 kHz may be reliably detected to within 0.02 percent of the true value. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2022
- Full Text:
- Date Issued: 2022-12
Cost control challenges in Eastern Cape Department of Health
- Authors: Ntete, Patrick
- Date: 2022-12
- Subjects: Cost control, Eastern Cape , Health Department
- Language: English
- Type: Master's theses , Thesis
- Identifier: http://hdl.handle.net/10948/59799 , vital:62435
- Description: Cost control in the South African public health sector has become a major concern due to the amount of money that the government loses every financial year. If costs in the South African public health sector are not kept under control there might be catastrophic consequences. Regardless of the challenges in controlling costs in the health sector, scant studies have explored the cost control phenomenon, which is seen as a scientific management technique to control and lessen the cost of conducting business. Keeping costs under control in the health sector became particularly important during the COVID-19 pandemic when the budgetary burden on the health sector worsened. This study aimed to identify challenges to cost control in the Eastern Cape Department of Health and come up with recommendations on how the challenges can be addressed. The study followed a qualitative research approach and an interview schedule with open-ended questions was prepared to answer the research questions that were formulated. The research sample consisted of 13 employees of the Eastern Cape Department of Health with work experience ranging between 11 and 15 years to ensure credible data. The study’s findings revealed that the participants who were interviewed had an idea of the cost control concept; that cost containment committees help reduce costs by monitoring and evaluating expenditure to ensure that the funds that are spent result in added value; that cost control is an important concept in the health sector, as it ensures that expenditure is reduced and that the influx of undocumented immigrants exerts unexpected pressure on the health sector as these people are generally not taken into account when the budget is drawn up. Findings from the study could assist in formulating strategies that can be employed to improve cost control in the health sector, for example, immunisation and educating employees and management about cost control measures and how they can be implemented. , Thesis (MBA) -- Faculty of Business and Economic Science, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Ntete, Patrick
- Date: 2022-12
- Subjects: Cost control, Eastern Cape , Health Department
- Language: English
- Type: Master's theses , Thesis
- Identifier: http://hdl.handle.net/10948/59799 , vital:62435
- Description: Cost control in the South African public health sector has become a major concern due to the amount of money that the government loses every financial year. If costs in the South African public health sector are not kept under control there might be catastrophic consequences. Regardless of the challenges in controlling costs in the health sector, scant studies have explored the cost control phenomenon, which is seen as a scientific management technique to control and lessen the cost of conducting business. Keeping costs under control in the health sector became particularly important during the COVID-19 pandemic when the budgetary burden on the health sector worsened. This study aimed to identify challenges to cost control in the Eastern Cape Department of Health and come up with recommendations on how the challenges can be addressed. The study followed a qualitative research approach and an interview schedule with open-ended questions was prepared to answer the research questions that were formulated. The research sample consisted of 13 employees of the Eastern Cape Department of Health with work experience ranging between 11 and 15 years to ensure credible data. The study’s findings revealed that the participants who were interviewed had an idea of the cost control concept; that cost containment committees help reduce costs by monitoring and evaluating expenditure to ensure that the funds that are spent result in added value; that cost control is an important concept in the health sector, as it ensures that expenditure is reduced and that the influx of undocumented immigrants exerts unexpected pressure on the health sector as these people are generally not taken into account when the budget is drawn up. Findings from the study could assist in formulating strategies that can be employed to improve cost control in the health sector, for example, immunisation and educating employees and management about cost control measures and how they can be implemented. , Thesis (MBA) -- Faculty of Business and Economic Science, 2022
- Full Text:
- Date Issued: 2022-12
Development of a continuous flow process towards the synthesis of fluvastatin: a lipid lowering drug
- Authors: Singata, Mzuvukile
- Date: 2022-12
- Subjects: Drug development – South Africa , Drugs --Law and legislation , Pharmaceutical technology -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59587 , vital:62175
- Description: Access to pharmaceuticals in low to middle income countries affects not only the health of a nation, but also the economy. Global pandemics such as the SARS COVID-19 pandemic have demonstrated this disparity. A potential solution to this crisis is an efficient and reliable means of local production of active pharmaceutical ingredients. Current manufacturing plants heavily rely on batch processes as their primary form of production. Batch production has been shown to have numerous disadvantages that impede the reliable production of drugs. Flow chemistry presents a possible solution to this impediment. Numerous advantages of flow chemistry make this technology a better and safer option for production; these include improved safety, faster reaction times and improved reaction control. In this research we present the use of flow chemistry towards the synthesis of fluvastatin, a lipid lowering drug for individuals that suffer from hypercholesterolemia, which is characterised by elevated levels of low-density lipoprotein that is sometimes referred to as bad cholesterol. Chapter 1 provides a detailed description of the background to the problem of hypercholesterolemia; in this chapter the role of cholesterol in the body and how it can end up becoming a problem is outlined. An in-depth analysis of flow chemistry is provided and finally the problem statement, aims and objectives are presented. Chapter 2 give a detailed description of the instrumentation and chemicals used in the research. A description of experimental methodology towards the synthesis of all intermediates in batch and flow systems is provided. Chapter 3 provides all the data collected from the research and describes a multivariate optimization of the intermediates towards the synthesis of fluvastatin. The first intermediate was successfully synthesized in batch (60%) and flow systems at an improved conversion of 98% in a residence time of 15 minutes. The second intermediate was also obtained in batch (32%) and using continuous flow systems at a conversion of 75% and a residence time of 25 minutes. The third intermediate was successfully cyclized in batch using ZnCl2 (50%) and via continuous flow using Amberlite IR120 in a packed column reactor at a residence time of 15 minutes at 95°C, to obtain a conversion of 98%. The final intermediate was successfully synthesized in batch (62%) and in flow; it was obtained at 98% at a residence time of 15 minutes using continuous flow. Chapter 4 provides a conclusion of the study; it also provides a description of the future work and recommendations for this research. , Thesis (MSc) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Development of a continuous flow process towards the synthesis of fluvastatin: a lipid lowering drug
- Authors: Singata, Mzuvukile
- Date: 2022-12
- Subjects: Drug development – South Africa , Drugs --Law and legislation , Pharmaceutical technology -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59587 , vital:62175
- Description: Access to pharmaceuticals in low to middle income countries affects not only the health of a nation, but also the economy. Global pandemics such as the SARS COVID-19 pandemic have demonstrated this disparity. A potential solution to this crisis is an efficient and reliable means of local production of active pharmaceutical ingredients. Current manufacturing plants heavily rely on batch processes as their primary form of production. Batch production has been shown to have numerous disadvantages that impede the reliable production of drugs. Flow chemistry presents a possible solution to this impediment. Numerous advantages of flow chemistry make this technology a better and safer option for production; these include improved safety, faster reaction times and improved reaction control. In this research we present the use of flow chemistry towards the synthesis of fluvastatin, a lipid lowering drug for individuals that suffer from hypercholesterolemia, which is characterised by elevated levels of low-density lipoprotein that is sometimes referred to as bad cholesterol. Chapter 1 provides a detailed description of the background to the problem of hypercholesterolemia; in this chapter the role of cholesterol in the body and how it can end up becoming a problem is outlined. An in-depth analysis of flow chemistry is provided and finally the problem statement, aims and objectives are presented. Chapter 2 give a detailed description of the instrumentation and chemicals used in the research. A description of experimental methodology towards the synthesis of all intermediates in batch and flow systems is provided. Chapter 3 provides all the data collected from the research and describes a multivariate optimization of the intermediates towards the synthesis of fluvastatin. The first intermediate was successfully synthesized in batch (60%) and flow systems at an improved conversion of 98% in a residence time of 15 minutes. The second intermediate was also obtained in batch (32%) and using continuous flow systems at a conversion of 75% and a residence time of 25 minutes. The third intermediate was successfully cyclized in batch using ZnCl2 (50%) and via continuous flow using Amberlite IR120 in a packed column reactor at a residence time of 15 minutes at 95°C, to obtain a conversion of 98%. The final intermediate was successfully synthesized in batch (62%) and in flow; it was obtained at 98% at a residence time of 15 minutes using continuous flow. Chapter 4 provides a conclusion of the study; it also provides a description of the future work and recommendations for this research. , Thesis (MSc) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Development of a crumb rubber adsorbent for the sorption of lead and copper from waste water: Optimization of sorption in a binary component system
- Authors: Hlabana,Relebohile Gladys
- Date: 2022-12
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59688 , vital:62356
- Description: Waste tyre is becoming a global environmental problem due to challenges in its disposal management and the fact that it poses fire hazards and metal leaching risk. Waste tyre can also breed mosquitos if it traps water thereby becoming an environmental health problem. There is also a portion of unused tyre in a waste tyre that is valuable and should be recycled. In South Africa waste tyre recycling is in three industries, one of which is crumb rubber where waste tyre is applied into various sized particles called crumb rubber. Crumb rubber can be applied in environmental remediation as an organic and inorganic pollutants’ adsorbent. Considering the fact that South Africa’s environment is loaded with heavy metal pollutants due to contributions by mining and agriculture as examples, it is postulated that crumb rubber produced in South Africa could be used to remediate the environment of these toxic metals. In this study adsorption of Pb (II) and Cu (II) from the synthetic waste water using waste tyre crumb rubber produced in South Africa was studied. Crumb rubber was activated using aqueous NaOH (0.02%) to make crumb rubber wettable followed by it being treated with 0.02 % acidified KMnO4 for modification of its ability to sorp positively charged metal species. Trial sorption experiments on 50 mg / L Cu (II) were successful with sorption of over 70% in 250 minutes. Final optimization of the sorption of combined Pb (II) and Cu (II) was studied using a full factorial design and optimum conditions of sorption were found to be pH 5.4; [metal] 0.617 mmol / L for Pb (II); and pH 5.4; the optimization of Cu (II) was found to be pH 5.4; [metal] 0.777 mmol / L. In Pb (II) sorptions the mechanism of adsorption on the activated crumb rubber was found to be following the Freundlich model indicating that the adsorption seemed to occur on a multilayer adsorbent, while the mechanism of copper(II) adsorption on to the activated crumb rubber was found to be following Langmuir model, indicating that the adsorption seemed to occur on a monolayer. With adsorption percentages ranging from 98.2 % to 100.0 %, for Pb (II), the crumb rubber produced under the conditions of this study, can be used in South Africa for selective removal of Pb (II). , Thesis (MSc) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Hlabana,Relebohile Gladys
- Date: 2022-12
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59688 , vital:62356
- Description: Waste tyre is becoming a global environmental problem due to challenges in its disposal management and the fact that it poses fire hazards and metal leaching risk. Waste tyre can also breed mosquitos if it traps water thereby becoming an environmental health problem. There is also a portion of unused tyre in a waste tyre that is valuable and should be recycled. In South Africa waste tyre recycling is in three industries, one of which is crumb rubber where waste tyre is applied into various sized particles called crumb rubber. Crumb rubber can be applied in environmental remediation as an organic and inorganic pollutants’ adsorbent. Considering the fact that South Africa’s environment is loaded with heavy metal pollutants due to contributions by mining and agriculture as examples, it is postulated that crumb rubber produced in South Africa could be used to remediate the environment of these toxic metals. In this study adsorption of Pb (II) and Cu (II) from the synthetic waste water using waste tyre crumb rubber produced in South Africa was studied. Crumb rubber was activated using aqueous NaOH (0.02%) to make crumb rubber wettable followed by it being treated with 0.02 % acidified KMnO4 for modification of its ability to sorp positively charged metal species. Trial sorption experiments on 50 mg / L Cu (II) were successful with sorption of over 70% in 250 minutes. Final optimization of the sorption of combined Pb (II) and Cu (II) was studied using a full factorial design and optimum conditions of sorption were found to be pH 5.4; [metal] 0.617 mmol / L for Pb (II); and pH 5.4; the optimization of Cu (II) was found to be pH 5.4; [metal] 0.777 mmol / L. In Pb (II) sorptions the mechanism of adsorption on the activated crumb rubber was found to be following the Freundlich model indicating that the adsorption seemed to occur on a multilayer adsorbent, while the mechanism of copper(II) adsorption on to the activated crumb rubber was found to be following Langmuir model, indicating that the adsorption seemed to occur on a monolayer. With adsorption percentages ranging from 98.2 % to 100.0 %, for Pb (II), the crumb rubber produced under the conditions of this study, can be used in South Africa for selective removal of Pb (II). , Thesis (MSc) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Development of a therapeutic drug monitoring model for aminoglycosides at a private hospital in the Eastern Cape
- Authors: Swanepoel, Caro Mae
- Date: 2022-12
- Subjects: Aminoglycosides -- Eastern Cape , Nephrotoxicity -- Eastern Cape , Drug Monitoring
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/60276 , vital:64291
- Description: Background: Aminoglycosides are highly effective against Gram-negative bacteria, including ESKAPE pathogens. However, aminoglycosides can cause nephrotoxicity and ototoxicity. Therapeutic drug monitoring (TDM) performed in patients receiving aminoglycosides can potentially reduce the development of antimicrobial resistance as well as aminoglycoside-induced toxicity and side effects. Primary Aim: The study aimed to identify TDM practices and subsequently develop a model for aminoglycoside TDM at a private hospital in the Eastern Cape. Methodology: Phase One involved the collection of data from the hospital’s database, using a purpose-designed data collection tool. Data from 135 eligible patients who received aminoglycoside therapy from June 2019 to June 2020 were reviewed. Data was captured, coded and analysed (using differential analysis). Semi-structured interviews were conducted (Phase Two) with three physicians and five pharmacists. Interview transcripts were coded using a combination of inductive and deductive coding techniques, followed by thematic analysis. The data was triangulated and used, together with recommendations from similar guidelines, to design a context-specific model for aminoglycoside TDM at the hospital. Results and Discussion: Results from Phases One and Two showed that TDM was not being performed correctly at the hospital. The overall incidence of aminoglycoside TDM was 19.26% (N = 135). The highest incidence of TDM occurred in ICU patients (n = 31; 51.61%). Drug monitoring was not consistently conducted in elderly (≥65 years) patients, or in those with signs of renal impairment; even though interviewed physicians and pharmacists identified elderly and renally impaired patients as “high risk” patients. Challenges regarding implementation of aminoglycoside TDM were explored. A lack of competent staff and time constraints were identified as major barriers to quality TDM services. Conclusion: The daily practices and TDM challenges at the site were considered during the design of the aminoglycoside TDM model, which can potentially facilitate better execution and monitoring practices for aminoglycosides at the private hospital. , Thesis (MA) -- Faculty of Health Sciences 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Swanepoel, Caro Mae
- Date: 2022-12
- Subjects: Aminoglycosides -- Eastern Cape , Nephrotoxicity -- Eastern Cape , Drug Monitoring
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/60276 , vital:64291
- Description: Background: Aminoglycosides are highly effective against Gram-negative bacteria, including ESKAPE pathogens. However, aminoglycosides can cause nephrotoxicity and ototoxicity. Therapeutic drug monitoring (TDM) performed in patients receiving aminoglycosides can potentially reduce the development of antimicrobial resistance as well as aminoglycoside-induced toxicity and side effects. Primary Aim: The study aimed to identify TDM practices and subsequently develop a model for aminoglycoside TDM at a private hospital in the Eastern Cape. Methodology: Phase One involved the collection of data from the hospital’s database, using a purpose-designed data collection tool. Data from 135 eligible patients who received aminoglycoside therapy from June 2019 to June 2020 were reviewed. Data was captured, coded and analysed (using differential analysis). Semi-structured interviews were conducted (Phase Two) with three physicians and five pharmacists. Interview transcripts were coded using a combination of inductive and deductive coding techniques, followed by thematic analysis. The data was triangulated and used, together with recommendations from similar guidelines, to design a context-specific model for aminoglycoside TDM at the hospital. Results and Discussion: Results from Phases One and Two showed that TDM was not being performed correctly at the hospital. The overall incidence of aminoglycoside TDM was 19.26% (N = 135). The highest incidence of TDM occurred in ICU patients (n = 31; 51.61%). Drug monitoring was not consistently conducted in elderly (≥65 years) patients, or in those with signs of renal impairment; even though interviewed physicians and pharmacists identified elderly and renally impaired patients as “high risk” patients. Challenges regarding implementation of aminoglycoside TDM were explored. A lack of competent staff and time constraints were identified as major barriers to quality TDM services. Conclusion: The daily practices and TDM challenges at the site were considered during the design of the aminoglycoside TDM model, which can potentially facilitate better execution and monitoring practices for aminoglycosides at the private hospital. , Thesis (MA) -- Faculty of Health Sciences 2022
- Full Text:
- Date Issued: 2022-12
Effectiveness of monetary policy transmission mechanism: the case of selected SADC countries
- Tengwa, Anakho https://orcid.org/0000-0002-0700-8668
- Authors: Tengwa, Anakho https://orcid.org/0000-0002-0700-8668
- Date: 2022-12
- Subjects: Monetary policy -- Africa, Southern , Transmission mechanism (Monetary policy) -- Africa, Southern , Economic development -- Africa, Southern
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/26863 , vital:66037
- Description: Monetary policy plays a significant role in countries economic development. The variability in inflation in the SADC region provides room to question the Effectiveness of the transmission of monetary policy as these countries experience inflation in different ways. The study analyses the effectiveness of monetary policy transmission mechanism on the selected 5 SADC countries, South Africa, Botswana, Mauritius, Tanzania, and Zambia. The selection of the countries was mainly based on data availability. To answer the study hypothesis, the study used secondary data from different data sources, employing the Vector Autoregression Regression. The different channels analysed include the exchange rate, interest rates as well as credit channel to measure monetary policy tools. The main variables are, Gross Domestic Product (GDP), Consumer Price Index (CPI)cpi and money supply. Panel unit root was tested to test the stationarity of the variables and the appropriate lag length was determined. Panel VAR model was estimated where the focus was mainly on variance decomposition and impulse response. Then lastly the stability of the model was tested using diagnostic test. The results revealed that interest rates channel and exchange rate channel have a more significant effect in explaining the transmission of macroeconomic shock to the rest of the economy through gpd and cpi. While the credit channel mostly transmits to the rest of the economy through money supply and cpi, its effects from GDP are rather insignificant. It is also noted that interest rates serve as the dominant channel in transmitting monetary policy shocks to the rest of the economy. When central banks decrease prime lending rates for commercial banks, this is passed to consumers making it less expensive to borrow. In the long run, attracts foreign investors which harms the domestic currency. The author has noted that future research could focus on how asset price channel affects the economy. , Thesis (MCom) -- Faculty of Management and Commerce, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Tengwa, Anakho https://orcid.org/0000-0002-0700-8668
- Date: 2022-12
- Subjects: Monetary policy -- Africa, Southern , Transmission mechanism (Monetary policy) -- Africa, Southern , Economic development -- Africa, Southern
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/26863 , vital:66037
- Description: Monetary policy plays a significant role in countries economic development. The variability in inflation in the SADC region provides room to question the Effectiveness of the transmission of monetary policy as these countries experience inflation in different ways. The study analyses the effectiveness of monetary policy transmission mechanism on the selected 5 SADC countries, South Africa, Botswana, Mauritius, Tanzania, and Zambia. The selection of the countries was mainly based on data availability. To answer the study hypothesis, the study used secondary data from different data sources, employing the Vector Autoregression Regression. The different channels analysed include the exchange rate, interest rates as well as credit channel to measure monetary policy tools. The main variables are, Gross Domestic Product (GDP), Consumer Price Index (CPI)cpi and money supply. Panel unit root was tested to test the stationarity of the variables and the appropriate lag length was determined. Panel VAR model was estimated where the focus was mainly on variance decomposition and impulse response. Then lastly the stability of the model was tested using diagnostic test. The results revealed that interest rates channel and exchange rate channel have a more significant effect in explaining the transmission of macroeconomic shock to the rest of the economy through gpd and cpi. While the credit channel mostly transmits to the rest of the economy through money supply and cpi, its effects from GDP are rather insignificant. It is also noted that interest rates serve as the dominant channel in transmitting monetary policy shocks to the rest of the economy. When central banks decrease prime lending rates for commercial banks, this is passed to consumers making it less expensive to borrow. In the long run, attracts foreign investors which harms the domestic currency. The author has noted that future research could focus on how asset price channel affects the economy. , Thesis (MCom) -- Faculty of Management and Commerce, 2022
- Full Text:
- Date Issued: 2022-12
Effects of Lignin on the properties of reclaimed rubber /natural rubber blends
- Makhelema, Junith Matshidiso
- Authors: Makhelema, Junith Matshidiso
- Date: 2022-12
- Subjects: Lignin – South Africa , Tires – Recycling
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59744 , vital:62409
- Description: The environmental challenge posed by waste tyres is a serious global crisis from which South Africa is not isolated. The concept of tyre rubber reclamation into reusable rubber over the years has been on the increase, however, despite the environmental and economic advantages offered by the reclaiming process the main demerits of the resulting rubber include its relatively poor physical and mechanical properties when compared to newly manufactured rubber. The deterioration of these properties arises from the structural changes which occur during the reclaiming process. To overcome this disadvantage, reclaimed rubber can be blended with other rubbers such as natural rubber to compensate for its weak properties. However, there is stilll a limited industrial application of reclaimed/natural rubber blends due to their brittleness and relatively poor impact strength. By adding reinforcing fillers, the mechanical properties of the blends can be significantly improved. In recent years, there has been a renewed interest in the use of lignocellulosic materials as fillers, modifiers and reinforcements in polymeric materials. They are receiving attention because they are the most abundantly available raw materials on earth, and they offer greater versatility compared to inorganic fillers. Being the most abundant renewable agricultural derived lignocellulosic biomass after cellulose, and as far as polymer composites and blends are concerned, lignin has shown promise as a well-received and sustainable alternative to inorganic fillers due to its low-cost production and ability to improve on the biodegradability of polyolefins and minimise loss of ultimate mechanical properties of polymer matrices. The main aim of the research is to investigate the effect of lignin on the properties of reclaimed/natural rubber (RR/NR) blends for possible low-density and eco-friendly rubber materials. The motivation for the research arises from the global challenges that are connected to the dynamic increase of rubber wastes, especially in the form of used tyres and the potential availability of lignin from its annual production from the sugarcane pulp mills, which is regarded as waste. A mixture design of experiments was used to formulate different blends of lignin with reclaimed and natural rubber. The rubber blends and the lignin-rubber , Thesis (MSc) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Makhelema, Junith Matshidiso
- Date: 2022-12
- Subjects: Lignin – South Africa , Tires – Recycling
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59744 , vital:62409
- Description: The environmental challenge posed by waste tyres is a serious global crisis from which South Africa is not isolated. The concept of tyre rubber reclamation into reusable rubber over the years has been on the increase, however, despite the environmental and economic advantages offered by the reclaiming process the main demerits of the resulting rubber include its relatively poor physical and mechanical properties when compared to newly manufactured rubber. The deterioration of these properties arises from the structural changes which occur during the reclaiming process. To overcome this disadvantage, reclaimed rubber can be blended with other rubbers such as natural rubber to compensate for its weak properties. However, there is stilll a limited industrial application of reclaimed/natural rubber blends due to their brittleness and relatively poor impact strength. By adding reinforcing fillers, the mechanical properties of the blends can be significantly improved. In recent years, there has been a renewed interest in the use of lignocellulosic materials as fillers, modifiers and reinforcements in polymeric materials. They are receiving attention because they are the most abundantly available raw materials on earth, and they offer greater versatility compared to inorganic fillers. Being the most abundant renewable agricultural derived lignocellulosic biomass after cellulose, and as far as polymer composites and blends are concerned, lignin has shown promise as a well-received and sustainable alternative to inorganic fillers due to its low-cost production and ability to improve on the biodegradability of polyolefins and minimise loss of ultimate mechanical properties of polymer matrices. The main aim of the research is to investigate the effect of lignin on the properties of reclaimed/natural rubber (RR/NR) blends for possible low-density and eco-friendly rubber materials. The motivation for the research arises from the global challenges that are connected to the dynamic increase of rubber wastes, especially in the form of used tyres and the potential availability of lignin from its annual production from the sugarcane pulp mills, which is regarded as waste. A mixture design of experiments was used to formulate different blends of lignin with reclaimed and natural rubber. The rubber blends and the lignin-rubber , Thesis (MSc) -- Faculty of Science, School of Biomolecular and Chemical Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Evaluation of the mesozooplankton functional diversity indices in Algoa Bay as proxies to assess the stability of the food chain leading to the African penguin (Spheniscus demersus)
- Authors: Rukuni, Praxedes Vimbai
- Date: 2022-12
- Subjects: Marine zooplankton --South Africa -- Algoa bay , Penguins -- South Africa -- Conservation , Fishes -- Predators of -- South Africa -- Algoa Bay
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59956 , vital:62698
- Description: Current unprecedented environmental changes threaten food web and ecosystem stability, which is particularly concerning in areas with vulnerable species such as the endangered African penguin Spheniscus demersus. In this study I adopted a holistic approach integrating many ecosystem levels to better understand African penguin behavioural ecology and food web stability. I investigated interplay between physico-chemical parameters and zooplankton functional diversity at various temporal and spatial scales in Algoa Bay. The study further investigated the applicability of zooplankton functional diversity (FD) in inferring African penguin food web stability by comparing the FD of zooplankton found in anchovies regurgitated from African penguins and the ones found in the Bay PELTER Stations. Gut contents of anchovies regurgitated from Bird Island and St Croix penguins were also evaluated using Frequency of Occurrence and Dominance methods and compared between colonies. Zooplankton FD in Algoa Bay varied over time but not at spatial scales with chlorophyll-a, Sea Surface Temperature (SST), turbidity and salinity being potential drivers of zooplankton FD. Chlorophyll-a and salinity were positively correlated with FD, meanwhile FD was inversely correlated to turbidity and SST. The study also observed minor differences in the physico-chemical parameters associated with African penguin foraging grounds, though different dietary preferences were found between the anchovies regurgitated from penguins from the two colonies. Anchovies regurgitated by penguins from Bird Island targeted large sized groups such as Decapods, meanwhile anchovies from the St Croix penguin colony targeted small sized Ostracods and Cirripedia. This study therefore, provides insight on the influence of fluctuations in physico-chemical parameters in shaping zooplankton communities in Algoa Bay. The study also emphasises anchovy dietary plasticity, switching from selective feeding to opportunistic feeding in instances of prey shortages which contributes to a stable African penguin food web in the face of climate change. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Rukuni, Praxedes Vimbai
- Date: 2022-12
- Subjects: Marine zooplankton --South Africa -- Algoa bay , Penguins -- South Africa -- Conservation , Fishes -- Predators of -- South Africa -- Algoa Bay
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59956 , vital:62698
- Description: Current unprecedented environmental changes threaten food web and ecosystem stability, which is particularly concerning in areas with vulnerable species such as the endangered African penguin Spheniscus demersus. In this study I adopted a holistic approach integrating many ecosystem levels to better understand African penguin behavioural ecology and food web stability. I investigated interplay between physico-chemical parameters and zooplankton functional diversity at various temporal and spatial scales in Algoa Bay. The study further investigated the applicability of zooplankton functional diversity (FD) in inferring African penguin food web stability by comparing the FD of zooplankton found in anchovies regurgitated from African penguins and the ones found in the Bay PELTER Stations. Gut contents of anchovies regurgitated from Bird Island and St Croix penguins were also evaluated using Frequency of Occurrence and Dominance methods and compared between colonies. Zooplankton FD in Algoa Bay varied over time but not at spatial scales with chlorophyll-a, Sea Surface Temperature (SST), turbidity and salinity being potential drivers of zooplankton FD. Chlorophyll-a and salinity were positively correlated with FD, meanwhile FD was inversely correlated to turbidity and SST. The study also observed minor differences in the physico-chemical parameters associated with African penguin foraging grounds, though different dietary preferences were found between the anchovies regurgitated from penguins from the two colonies. Anchovies regurgitated by penguins from Bird Island targeted large sized groups such as Decapods, meanwhile anchovies from the St Croix penguin colony targeted small sized Ostracods and Cirripedia. This study therefore, provides insight on the influence of fluctuations in physico-chemical parameters in shaping zooplankton communities in Algoa Bay. The study also emphasises anchovy dietary plasticity, switching from selective feeding to opportunistic feeding in instances of prey shortages which contributes to a stable African penguin food web in the face of climate change. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Experiences of Family Caregivers Caring for Mentally Ill Relatives in a Rural District of the Eastern Cape Province
- Authors: Koti, Tulisile
- Date: 2022-12
- Subjects: Caregivers -- Eastern Cape , Mental illness -- Eastern Cape
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/60166 , vital:63208
- Description: Mental illness refers to all diagnosable mental disorders, whether by a medical doctor or a psychiatrist. It includes significant changes in thinking, emotion, and behavior and may result in distress or difficulty functioning in society, work or family. South Africa has been on a de-institutionalization path for several decades, despite this, many mentally ill people are forced to live at home with their families. As a result, family caregivers have been faced with responsibilities for which they are unprepared. The burden of caring for the mentally ill causes distress and challenges for the primary caregiver and the family members involved in the care. This study aimed to explore the experiences and coping of caregivers living with mentally ill relatives. The researcher utilized Lazarus and Folkman's psychological stress and coping theory and other relevant literature to conceptualize the study. The study made use of a qualitative and exploratory design. Seven individual face-to-face interviews were conducted with semi-structured questions. Purposeful and snowball samples were used, and the study was analyzed using thematic analysis. Based on the study's findings, caring for a mentally ill relative had negative and positive outcomes for the caregiver. There were more negative experiences than there were positive ones. However, caregivers found ways to cope with these negative experiences. These findings should contribute to educating health professionals who are the primary contact for mentally ill patients and their family caregivers in rural communities. This will assist in pursuit of the third Sustainable Development goals (SDG3) which aims to “ensure healthy lives and promote well-being for all at all ages”. This study produced an understanding of the lived experiences of caregivers in a rural Eastern Cape. , Thesis (MA) -- Faculty of Health Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Koti, Tulisile
- Date: 2022-12
- Subjects: Caregivers -- Eastern Cape , Mental illness -- Eastern Cape
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/60166 , vital:63208
- Description: Mental illness refers to all diagnosable mental disorders, whether by a medical doctor or a psychiatrist. It includes significant changes in thinking, emotion, and behavior and may result in distress or difficulty functioning in society, work or family. South Africa has been on a de-institutionalization path for several decades, despite this, many mentally ill people are forced to live at home with their families. As a result, family caregivers have been faced with responsibilities for which they are unprepared. The burden of caring for the mentally ill causes distress and challenges for the primary caregiver and the family members involved in the care. This study aimed to explore the experiences and coping of caregivers living with mentally ill relatives. The researcher utilized Lazarus and Folkman's psychological stress and coping theory and other relevant literature to conceptualize the study. The study made use of a qualitative and exploratory design. Seven individual face-to-face interviews were conducted with semi-structured questions. Purposeful and snowball samples were used, and the study was analyzed using thematic analysis. Based on the study's findings, caring for a mentally ill relative had negative and positive outcomes for the caregiver. There were more negative experiences than there were positive ones. However, caregivers found ways to cope with these negative experiences. These findings should contribute to educating health professionals who are the primary contact for mentally ill patients and their family caregivers in rural communities. This will assist in pursuit of the third Sustainable Development goals (SDG3) which aims to “ensure healthy lives and promote well-being for all at all ages”. This study produced an understanding of the lived experiences of caregivers in a rural Eastern Cape. , Thesis (MA) -- Faculty of Health Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Exploring and contextualising the predominant coastal and marine environmental worldview orientations of millennial South Africans
- Authors: van Rooyen, Rize Dorothea
- Date: 2022-12
- Subjects: Coastal ecology , Marine ecology , Generation Y -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/62484 , vital:72764
- Description: The increase in human activities within the marine and coastal environments has introduced new stressors to the ocean’s ecosystems. Despite the increasing specification of coastal and marine environments within South African management policy and programmes, marine issues as well as ocean and coastal-related environmental inspections still lag behind terrestrial issues. Previous research identified the importance of including contextual factors within the study of environmental worldviews and behaviour. The present study aimed to address the identified needs within South African environmental management frameworks for proactive approaches, with consideration to the values and beliefs of the citizens of South Africa as specified in the National Environmental Management Act. The study specifically explores the coastal and marine environmental worldviews of a sample of South African millennials with reference to the contextual constraints, which influence their environmental perceptions and behaviours. This generation constitutes 26.4% of South Africa’s population and, according to literature, is largely underrepresented within environmental discourse. This exploratory-descriptive study utilised four research phases to contextualise the coastal and marine environmental worldviews of nine millennial South Africans, namely, a systematic review of 1236 academic articles, an observation and analysis of 50 environmentally focused Tweets from South African news media outlets, and the subsequent engagements, the distribution of a compiled coastal and marine environmental worldview scale to a sample of nine millennial South Africans and, finally, a set of phenomenological interviews with nine millennial South Africans to discuss the contextual constraints to pro-environmental behaviours. The findings of the study resulted in the provision of a theoretical model regarding the antecedents to environmental behaviour, which addressed the complexity of antecedent attributes omitted in contemporary theory. Additionally, the findings provided a framework of contextual attributes from which to address South African coastal and marine environmental worldviews. The findings further provided baseline information for proactive, informed, as well as participatory decisions and programmes for policy, development, and conservation. The present study represented a novel contribution to academic knowledge through its provision of a theoretical and contextual framework from which to study the antecedents of environmental behaviour. It further presents a novel contribution to development practice, allowing for proactive approaches to environmental management. , Thesis (D.Phil) -- Faculty of Business and Economic Sciences , School of Economics, Development & Tourism, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: van Rooyen, Rize Dorothea
- Date: 2022-12
- Subjects: Coastal ecology , Marine ecology , Generation Y -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/62484 , vital:72764
- Description: The increase in human activities within the marine and coastal environments has introduced new stressors to the ocean’s ecosystems. Despite the increasing specification of coastal and marine environments within South African management policy and programmes, marine issues as well as ocean and coastal-related environmental inspections still lag behind terrestrial issues. Previous research identified the importance of including contextual factors within the study of environmental worldviews and behaviour. The present study aimed to address the identified needs within South African environmental management frameworks for proactive approaches, with consideration to the values and beliefs of the citizens of South Africa as specified in the National Environmental Management Act. The study specifically explores the coastal and marine environmental worldviews of a sample of South African millennials with reference to the contextual constraints, which influence their environmental perceptions and behaviours. This generation constitutes 26.4% of South Africa’s population and, according to literature, is largely underrepresented within environmental discourse. This exploratory-descriptive study utilised four research phases to contextualise the coastal and marine environmental worldviews of nine millennial South Africans, namely, a systematic review of 1236 academic articles, an observation and analysis of 50 environmentally focused Tweets from South African news media outlets, and the subsequent engagements, the distribution of a compiled coastal and marine environmental worldview scale to a sample of nine millennial South Africans and, finally, a set of phenomenological interviews with nine millennial South Africans to discuss the contextual constraints to pro-environmental behaviours. The findings of the study resulted in the provision of a theoretical model regarding the antecedents to environmental behaviour, which addressed the complexity of antecedent attributes omitted in contemporary theory. Additionally, the findings provided a framework of contextual attributes from which to address South African coastal and marine environmental worldviews. The findings further provided baseline information for proactive, informed, as well as participatory decisions and programmes for policy, development, and conservation. The present study represented a novel contribution to academic knowledge through its provision of a theoretical and contextual framework from which to study the antecedents of environmental behaviour. It further presents a novel contribution to development practice, allowing for proactive approaches to environmental management. , Thesis (D.Phil) -- Faculty of Business and Economic Sciences , School of Economics, Development & Tourism, 2022
- Full Text:
- Date Issued: 2022-12
Exploring the Methodologies Used by Construction Project Managers in South Africa
- Authors: Ferreira, Ruan
- Date: 2022-12
- Subjects: Construction -- South Africa , Project Management
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59381 , vital:62076
- Description: This study aimed to determine the prevalent project management methodologies (PMMs) are adopted within the South African construction industry. The insight obtained from this study will enhance awareness of the type of methodologies adopted by construction project managers. Moreover, through implementation of these methodologies, control can be enhanced, and the unknown managed. The predominant project management methodology used by construction project managers in South Africa is unknown. A quantitative research approach was used, and an online questionnaire was sent to the South African Council for the Project and Construction Management Professions (SACPCMP). The questionnaire was then administered and sent to the entire population of registered construction project managers (CPMs). The data from 103 respondents were captured onto a database and then statistically analysed to determine the predominant PMMs adopted by CPMs as well as their effect on project success. The study revealed that lean methodology is most widely adopted by CPMs, followed by the critical path method and Waterfall methodology. CPMs strive to reduce waste throughout the building process and organise that materials are only on site when required. Furthermore, a high level of PMM is adopted during the project life cycle phases. As a result, it can favourably impact projects and lead to project success. Adopting PMMs will result in improved control of project goals and scope, a shorter time of project execution, improved and efficient decision making, a higher degree of client satisfaction, and improved knowledge management and information exchange. , Thesis (MA) -- Faculty of Engineering, the Built Environment, and Technology, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Ferreira, Ruan
- Date: 2022-12
- Subjects: Construction -- South Africa , Project Management
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59381 , vital:62076
- Description: This study aimed to determine the prevalent project management methodologies (PMMs) are adopted within the South African construction industry. The insight obtained from this study will enhance awareness of the type of methodologies adopted by construction project managers. Moreover, through implementation of these methodologies, control can be enhanced, and the unknown managed. The predominant project management methodology used by construction project managers in South Africa is unknown. A quantitative research approach was used, and an online questionnaire was sent to the South African Council for the Project and Construction Management Professions (SACPCMP). The questionnaire was then administered and sent to the entire population of registered construction project managers (CPMs). The data from 103 respondents were captured onto a database and then statistically analysed to determine the predominant PMMs adopted by CPMs as well as their effect on project success. The study revealed that lean methodology is most widely adopted by CPMs, followed by the critical path method and Waterfall methodology. CPMs strive to reduce waste throughout the building process and organise that materials are only on site when required. Furthermore, a high level of PMM is adopted during the project life cycle phases. As a result, it can favourably impact projects and lead to project success. Adopting PMMs will result in improved control of project goals and scope, a shorter time of project execution, improved and efficient decision making, a higher degree of client satisfaction, and improved knowledge management and information exchange. , Thesis (MA) -- Faculty of Engineering, the Built Environment, and Technology, 2022
- Full Text:
- Date Issued: 2022-12
Factors that impact the use of digital learning in higher education
- Authors: Mtshabe Mxolisi
- Date: 2022-12
- Subjects: Education, Higher , Blended learning , Communication of technical information
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59576 , vital:62174
- Description: Higher Education Institutions (HEIs) have significantly changed the way they execute their pedagogical processes. This is so, mainly because of the innovations and developments in the ICT sector. HEIs have always succeeded in the implementation of ICT tools for the facilitation of the process of teaching and learning; however, they have faced many challenges related to the utilisation of these tools. Digital learning is among the ICT tools considered by the majority of HEIs to be relevant at this age of digitisation. ICT has introduced a variety of tools, not only for teaching and learning environments, but also for socialisation. These tools include social media tools that are used to achieve different activities in response to the demands of society. In making a comparison between social media and pedagogical tools, there is a huge gap in the level of usage of the two. Social media is much more being used than digital learning and this brings major concerns because users seem to be more interested in social media tools to perform academic activities, than in digital learning. This study has explored the factors that could play a role in digital learning and social media usage in HEIs. The study employed quantitative research methods and a survey was developed and distributed to former university students. The purpose of the study was to formulate a checklist that will inform the factors that impact the use of digital learning in HEIs. At the conclusion of the study, the checklist was formulated and recommendations were made. , Thesis (MA) -- Faculty of Engineering, the Built Environment, and Technology, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Mtshabe Mxolisi
- Date: 2022-12
- Subjects: Education, Higher , Blended learning , Communication of technical information
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59576 , vital:62174
- Description: Higher Education Institutions (HEIs) have significantly changed the way they execute their pedagogical processes. This is so, mainly because of the innovations and developments in the ICT sector. HEIs have always succeeded in the implementation of ICT tools for the facilitation of the process of teaching and learning; however, they have faced many challenges related to the utilisation of these tools. Digital learning is among the ICT tools considered by the majority of HEIs to be relevant at this age of digitisation. ICT has introduced a variety of tools, not only for teaching and learning environments, but also for socialisation. These tools include social media tools that are used to achieve different activities in response to the demands of society. In making a comparison between social media and pedagogical tools, there is a huge gap in the level of usage of the two. Social media is much more being used than digital learning and this brings major concerns because users seem to be more interested in social media tools to perform academic activities, than in digital learning. This study has explored the factors that could play a role in digital learning and social media usage in HEIs. The study employed quantitative research methods and a survey was developed and distributed to former university students. The purpose of the study was to formulate a checklist that will inform the factors that impact the use of digital learning in HEIs. At the conclusion of the study, the checklist was formulated and recommendations were made. , Thesis (MA) -- Faculty of Engineering, the Built Environment, and Technology, 2022
- Full Text:
- Date Issued: 2022-12
Fixed point theory in metric and normed Spaces
- Authors: Naude, Luan
- Date: 2022-12
- Subjects: Metric spaces – South Africa , Banach spaces – South Africa , Mappings (Mathematics)
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59898 , vital:62686
- Description: In this dissertation, we present major results in the theory of fixed points in metric and normed spaces. We start with a review of the Banach fixed point theorem and some of its applications (in systems of linear equations, differential equations, integral equations, and dynamical systems), and then discuss many of its extensions and generalizations. We look at the theorem of Edelstein ([8, Remark 3.1]) in compact metric spaces, and a generalizaton of it proved by Suzuki ([19, Theorem 3]) in 2009. We then give a detailed account of the work of Meyers: In [11], Meyers proved generalizations of the Banach fixed point theorem to uniform local contractions, and, in [10], a converse to the Banach fixed point theorem. Finally, we look at some of Browder’s work in fixed point theory. In [6], he showed the existence of fixed points for nonexpansive mappings on bounded, closed, and convex sets in uniformly convex Banach spaces, and, in [5], he proved similar results in Hilbert spaces using a connection between nonexpansive mappings and monotone operators. Keywords: Fixed point, Functional analysis, Metric spaces, Banach spaces, Hilbert spaces, contractions, Banach fixed point theorem, nonexpansive mappings. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Naude, Luan
- Date: 2022-12
- Subjects: Metric spaces – South Africa , Banach spaces – South Africa , Mappings (Mathematics)
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59898 , vital:62686
- Description: In this dissertation, we present major results in the theory of fixed points in metric and normed spaces. We start with a review of the Banach fixed point theorem and some of its applications (in systems of linear equations, differential equations, integral equations, and dynamical systems), and then discuss many of its extensions and generalizations. We look at the theorem of Edelstein ([8, Remark 3.1]) in compact metric spaces, and a generalizaton of it proved by Suzuki ([19, Theorem 3]) in 2009. We then give a detailed account of the work of Meyers: In [11], Meyers proved generalizations of the Banach fixed point theorem to uniform local contractions, and, in [10], a converse to the Banach fixed point theorem. Finally, we look at some of Browder’s work in fixed point theory. In [6], he showed the existence of fixed points for nonexpansive mappings on bounded, closed, and convex sets in uniformly convex Banach spaces, and, in [5], he proved similar results in Hilbert spaces using a connection between nonexpansive mappings and monotone operators. Keywords: Fixed point, Functional analysis, Metric spaces, Banach spaces, Hilbert spaces, contractions, Banach fixed point theorem, nonexpansive mappings. , Thesis (MSc) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2022
- Full Text:
- Date Issued: 2022-12
Grain size analysis, coastal hydrodynamics and erosion protection: a case study from Knysna and Plettenberg Bay, South Africa
- Authors: Pezisa, Ayabulela Raymond
- Date: 2022-12
- Subjects: Grain -- Analysis , Hydrodynamics , Shore protection
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/27698 , vital:69394
- Description: The modern beach sands and Cretaceous Knysna Formation distributed along the coast of Plettenberg Bay and Knysna coast in the Western Cape Province of South Africa, have been examined and studied in the field outcrops and laborataries via grain-size analysis, XRD, SEM, EDX and microcope petrography analyses. This study looked into the coastal hydrodynamics and environment protection. The project aims to investigate the sediment distribution, grain-size variation, sedimentary structures, coast erosion and mitigation in the Plettenberg and Knysna coast to address environmental issues in the south coast of South Africa. The research will provide new insight onto coastal sedimentation, hydrodynamic condition, coastline erosion and the safety of the coastal environment and human property. The study will promote government attention on the sea level change, which caused flooding and environmental disaster along the south coastal area of South Africa. The rock sequence in the inland side of the study areas belongs to Cretaceous Knysna Formation, which comprises seven upward fining sequences. The stratigraphic sequence is underlain by the Table Mountain quartzite of the Cape Supergroup, and is overlain by Tertiary sediments and modern coastal dune sands. The Knysna Formation at the research area consists of massive conglomerate, sandstone and minor mudstone of mainly fluvial dominated sediments. The grain size analysis reveals that the modern fluvial channels at Plettenberg Bay and Knysna areas are of dominant coarse sands with minor silt and mud, which defines the sediments were deposited by moderate to high energy currents. Whilst the beach zones in Plettenberg Bay are predominated by fine to medium-grained marine sands. Grain-size analyses of beach sands show well-sorted, fine to coarse skewed in grain size distribution, indicating a relative lower to medium uniform energy condition during transportation and deposition. The bivariate plots of grain-size distribution demonstrate of the shallow agitated marine environment with the influence of tide and aeolian processes. Hydrodynamic condition in the beach area was more persistant and less variation compared to the river environment. The mineralogy and petrology studies revealed that in Plettenberg Bay and Knysna sediments are predominantly consisted of minerals quartz, feldspar, calcite, muscovite, aragonite, clay minerals, and salts (halite). Skeletal carbonate minerals (shell and coral fragments) are more than chemical precipitated carbonate minerals. The microtextures detected on the surface of the fluvial and marine sand grais involve V-shaped pits, upturn pits, dissolution pits and secondary mineral precipitation that were created by chemical and mechanical processes formed via sea-water dissolution, corrosion, and transport crashing. Whereas the boring holes and burrows created by activity of microorganisms boing into the surface of the grains. These microtextures of the river and beach sands exhibit a shallow marine and fluvial environments with medium to high energy conditions and active organic activities. Several sedimentary structures were detected in the coastal environments, including various types of ripple marks and dunes, burst bubble-hole, swash line, rill marks, rhomboid marks, burrows, boring and bioturbation, planar lamination and gravel pavement. In addition, sedimentary structures were also identified in the Cretaceous Knysna Formation such as air/water escape hole, convolute bedding, lenticular bedding, tabular cross-bedding and load cast. The sedimetnary structures closely linked with hydrodynamic conditions and therefore can be used as indicators for depositional environments. Flooding and erosion had become a coastal disaster that results in sediment redistribution throughout the coastal system and therefore caused landscape reform like coastal cliffs and sharpened dunes in erosive areas. Particularly, coastal hazards become more and more serious in recent years due to climate and sea leavel changes. Thus, to recognise coastal erosion and disaster and make a management strategy is of significant importance to compete against coastline retreat and to protect infrastructure and human safety in the coast area. The author had proposed a number of mitigation methods for environmental protection and for combating coastal erosion, including breakwaters, groins, jetties, vertical walls, rock armour, vegetation, boundary hardening, and revetment etc, which are the effective ways for protection of coast retreat, property damage and human safety. , Thesis (MSci) -- Faculty of Science and Agriculture, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Pezisa, Ayabulela Raymond
- Date: 2022-12
- Subjects: Grain -- Analysis , Hydrodynamics , Shore protection
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/27698 , vital:69394
- Description: The modern beach sands and Cretaceous Knysna Formation distributed along the coast of Plettenberg Bay and Knysna coast in the Western Cape Province of South Africa, have been examined and studied in the field outcrops and laborataries via grain-size analysis, XRD, SEM, EDX and microcope petrography analyses. This study looked into the coastal hydrodynamics and environment protection. The project aims to investigate the sediment distribution, grain-size variation, sedimentary structures, coast erosion and mitigation in the Plettenberg and Knysna coast to address environmental issues in the south coast of South Africa. The research will provide new insight onto coastal sedimentation, hydrodynamic condition, coastline erosion and the safety of the coastal environment and human property. The study will promote government attention on the sea level change, which caused flooding and environmental disaster along the south coastal area of South Africa. The rock sequence in the inland side of the study areas belongs to Cretaceous Knysna Formation, which comprises seven upward fining sequences. The stratigraphic sequence is underlain by the Table Mountain quartzite of the Cape Supergroup, and is overlain by Tertiary sediments and modern coastal dune sands. The Knysna Formation at the research area consists of massive conglomerate, sandstone and minor mudstone of mainly fluvial dominated sediments. The grain size analysis reveals that the modern fluvial channels at Plettenberg Bay and Knysna areas are of dominant coarse sands with minor silt and mud, which defines the sediments were deposited by moderate to high energy currents. Whilst the beach zones in Plettenberg Bay are predominated by fine to medium-grained marine sands. Grain-size analyses of beach sands show well-sorted, fine to coarse skewed in grain size distribution, indicating a relative lower to medium uniform energy condition during transportation and deposition. The bivariate plots of grain-size distribution demonstrate of the shallow agitated marine environment with the influence of tide and aeolian processes. Hydrodynamic condition in the beach area was more persistant and less variation compared to the river environment. The mineralogy and petrology studies revealed that in Plettenberg Bay and Knysna sediments are predominantly consisted of minerals quartz, feldspar, calcite, muscovite, aragonite, clay minerals, and salts (halite). Skeletal carbonate minerals (shell and coral fragments) are more than chemical precipitated carbonate minerals. The microtextures detected on the surface of the fluvial and marine sand grais involve V-shaped pits, upturn pits, dissolution pits and secondary mineral precipitation that were created by chemical and mechanical processes formed via sea-water dissolution, corrosion, and transport crashing. Whereas the boring holes and burrows created by activity of microorganisms boing into the surface of the grains. These microtextures of the river and beach sands exhibit a shallow marine and fluvial environments with medium to high energy conditions and active organic activities. Several sedimentary structures were detected in the coastal environments, including various types of ripple marks and dunes, burst bubble-hole, swash line, rill marks, rhomboid marks, burrows, boring and bioturbation, planar lamination and gravel pavement. In addition, sedimentary structures were also identified in the Cretaceous Knysna Formation such as air/water escape hole, convolute bedding, lenticular bedding, tabular cross-bedding and load cast. The sedimetnary structures closely linked with hydrodynamic conditions and therefore can be used as indicators for depositional environments. Flooding and erosion had become a coastal disaster that results in sediment redistribution throughout the coastal system and therefore caused landscape reform like coastal cliffs and sharpened dunes in erosive areas. Particularly, coastal hazards become more and more serious in recent years due to climate and sea leavel changes. Thus, to recognise coastal erosion and disaster and make a management strategy is of significant importance to compete against coastline retreat and to protect infrastructure and human safety in the coast area. The author had proposed a number of mitigation methods for environmental protection and for combating coastal erosion, including breakwaters, groins, jetties, vertical walls, rock armour, vegetation, boundary hardening, and revetment etc, which are the effective ways for protection of coast retreat, property damage and human safety. , Thesis (MSci) -- Faculty of Science and Agriculture, 2022
- Full Text:
- Date Issued: 2022-12
Growth performance of three F1 Hybrid tomato (Solanum lycopersicum L.) Cultivars grown in Peat moss and Sawdust
- Authors: Mondile, Landile
- Date: 2022-12
- Subjects: Agricultural development projects -- South Africa -- Eastern Cape , Tomatoes – Irrigation – Management
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59853 , vital:62450
- Description: The tomato is one of the most important and commonly grown vegetable crops cultivated by subsistence as well as commercial farmers in South Africa. Even though hydroponic tomato production has gained popularity, tomato production in South Africa is mostly practised open field. This is because most South African households in rural communities depend on agriculture for their livelihoods. Tomatoes are one of the “cash crops” − meaning cash in hand for many farmers. As a staple food for many rural communities and households, tomatoes are prepared as relish daily. Including tomatoes in the human diet provides the benefit of various important nutrients, such as Vitamin C, amongst others. The main aim of this study was to evaluate the growth performance − by assessing the number of leaves, stem diameter, plant height and number of flowers per plant − in three Solanum lycopersicum L. cultivars, namely: F1 hybrids Star9006, TF4009 and TF4011, grown in peat moss and sawdust respectively. In addition, the research aimed at investigating how peat moss and sawdust, as growing media, influenced the growth performance of the tomato cultivars under study. The study was conducted at the Döhne Agricultural Development Institute near Stutterheim in the Eastern Cape. The experiment was laid out in a split randomized complete block design (RCBD) in which the growing media, namely: sawdust and peat moss, were assigned as main plots and the tomato cultivars to sub-plots, with three replicates. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Mondile, Landile
- Date: 2022-12
- Subjects: Agricultural development projects -- South Africa -- Eastern Cape , Tomatoes – Irrigation – Management
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59853 , vital:62450
- Description: The tomato is one of the most important and commonly grown vegetable crops cultivated by subsistence as well as commercial farmers in South Africa. Even though hydroponic tomato production has gained popularity, tomato production in South Africa is mostly practised open field. This is because most South African households in rural communities depend on agriculture for their livelihoods. Tomatoes are one of the “cash crops” − meaning cash in hand for many farmers. As a staple food for many rural communities and households, tomatoes are prepared as relish daily. Including tomatoes in the human diet provides the benefit of various important nutrients, such as Vitamin C, amongst others. The main aim of this study was to evaluate the growth performance − by assessing the number of leaves, stem diameter, plant height and number of flowers per plant − in three Solanum lycopersicum L. cultivars, namely: F1 hybrids Star9006, TF4009 and TF4011, grown in peat moss and sawdust respectively. In addition, the research aimed at investigating how peat moss and sawdust, as growing media, influenced the growth performance of the tomato cultivars under study. The study was conducted at the Döhne Agricultural Development Institute near Stutterheim in the Eastern Cape. The experiment was laid out in a split randomized complete block design (RCBD) in which the growing media, namely: sawdust and peat moss, were assigned as main plots and the tomato cultivars to sub-plots, with three replicates. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Habitat use by Juvenile coastal fish in subtidal vegetated habitats of Algoa Bay;s shallow water seascape
- Authors: Mkhize,Thembani
- Date: 2022-12
- Subjects: Sailing ships -- South Africa -- Algoa Bay --History , Marine fishes -- Algoa Bay -- South Africa , Fish improvement habitat
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59788 , vital:62429
- Description: Structurally complex habitats such as seagrass, mangroves, and seaweed are important as nurseries in estuaries and nearshore marine environments. While numerous studies have focussed on structurally complex vegetated habitats in estuaries, few studies have focussed on vegetated nursery habitats (particularly seaweed) in coastal areas and their importance. The main aim of this project is to examine the nature of shallow water vegetated habitat (Zostera capensis seagrass and Plocamium corallorhiza macroalga) usage by juvenile fish in the Algoa Bay shallow water seascape (Swartkops Estuary and Flat Rocks nearshore subtidal reef). This aim was achieved by quantifying and comparing complexity of these two habitat-forming species, and the fish assemblages (relative abundance, richness, size structure and behaviour) across the two habitats. To measure and compare complexity of Z. capensis and P. corallorhiza, canopy height, density and leaf/blade width were sampled. In addition to these structural complexity indices, Fractal D (dimensionless complexity indices) was also quantified using Image software. Zostera capensis (1553.3 Indiv/m2 ) had a slightly higher mean density compared to P. corallorhiza (1303.7 Indiv/m2 ) but the difference was not significant. When sites (within each habitat) were compared, density did not show any significant differences between sites. Canopy height of Z. capensis (56.9 cm) was significantly higher compared to P. corallorhiza (16.6 cm), with no significant differences between sites. On the other hand, P. corallorhiza (0.9 cm) blades were significantly wider than Z. capensis (0.2 cm) leaves. Fractal D values followed the same trend as leaf/blade width with, with P. corallorhiza (1.8) having significantly higher Fractal D values than Z. capensis (1.5). The last two indices also had a positive relationship as Fractal D increased with increasing leaf/blade width. These results show that overall P. corallorhiza is more structurally complex than Z. capensis. Calibrated mini stereo underwater remote video systems (mini stereo-RUVs) were optimised in these two studied habitats to ensure they were suitable to measure and identify juvenile fishes. A pilot optimization study found that a minimum of five deployments and a minimum of 45 minutes filming duration is required to study fish assemblages in these two habitats. For comparison of fish assemblages and assessment of habitat use by fish, mini stereo-RUVs were deployed in both habitats (three sites per habitat) and were left to record for 60 minutes for a v total of five sampling occasions in seagrass and seven sampling occasions in macroalga between 7 September 2020 and 9 April 2021. Collected videos were analysed, with relative abundance (MaxN), richness and fish length extracted. Fish behaviour was also analysed and compared between habitats. Mean fish MaxN was slightly higher in Z. capensis (3.4) than in P. corallorhiza (2.9), although this result was not significant. Species diversity was significantly higher in P. corallorhiza as shown by both richness (Z. capensis = 11 and P. corallorhiza = 18) and the Shannon diversity index (Z. capensis = 1.3 and P. corallorhiza = 1.7). Both habitats were dominated by species from the family Sparidae, with six estuary-associated marine species common between the two habitats. Both Z. capensis and P. corallorhiza were dominated by juvenile fish, with more than 70 % of measured fish being juveniles. Fish length was not significantly different in the two habitats. Juvenile fish assemblages were significantly distinct between the two habitats (ANOSIM). In terms of habitat use, fish behaviour analysis showed that fish use both habitats as nurseries. There was no significant difference in fish behaviour in the two habitats and fish behaviours associated with higher levels of habitat use (slow meandering and feeding) were the most common behaviours in both habitats. Although not significant, feeding behaviour (also associated with a high degree of habitat use) was observed more in macroalga than in the seagrass habitat. Although none of the studied complexity indices could be related to abundance, both leaf/blade width and Fractal Dimension showed a positive relationship with the number of species recorded, while canopy height showed a strong negative relationship with the number of species. Overall, this study shows that Plocamium corallorhiza red macroalga in the shallow marine environment may be as important in shallow marine environments as Zostera capensis seagrass in estuaries as nursery habitats for marine fi , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Mkhize,Thembani
- Date: 2022-12
- Subjects: Sailing ships -- South Africa -- Algoa Bay --History , Marine fishes -- Algoa Bay -- South Africa , Fish improvement habitat
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59788 , vital:62429
- Description: Structurally complex habitats such as seagrass, mangroves, and seaweed are important as nurseries in estuaries and nearshore marine environments. While numerous studies have focussed on structurally complex vegetated habitats in estuaries, few studies have focussed on vegetated nursery habitats (particularly seaweed) in coastal areas and their importance. The main aim of this project is to examine the nature of shallow water vegetated habitat (Zostera capensis seagrass and Plocamium corallorhiza macroalga) usage by juvenile fish in the Algoa Bay shallow water seascape (Swartkops Estuary and Flat Rocks nearshore subtidal reef). This aim was achieved by quantifying and comparing complexity of these two habitat-forming species, and the fish assemblages (relative abundance, richness, size structure and behaviour) across the two habitats. To measure and compare complexity of Z. capensis and P. corallorhiza, canopy height, density and leaf/blade width were sampled. In addition to these structural complexity indices, Fractal D (dimensionless complexity indices) was also quantified using Image software. Zostera capensis (1553.3 Indiv/m2 ) had a slightly higher mean density compared to P. corallorhiza (1303.7 Indiv/m2 ) but the difference was not significant. When sites (within each habitat) were compared, density did not show any significant differences between sites. Canopy height of Z. capensis (56.9 cm) was significantly higher compared to P. corallorhiza (16.6 cm), with no significant differences between sites. On the other hand, P. corallorhiza (0.9 cm) blades were significantly wider than Z. capensis (0.2 cm) leaves. Fractal D values followed the same trend as leaf/blade width with, with P. corallorhiza (1.8) having significantly higher Fractal D values than Z. capensis (1.5). The last two indices also had a positive relationship as Fractal D increased with increasing leaf/blade width. These results show that overall P. corallorhiza is more structurally complex than Z. capensis. Calibrated mini stereo underwater remote video systems (mini stereo-RUVs) were optimised in these two studied habitats to ensure they were suitable to measure and identify juvenile fishes. A pilot optimization study found that a minimum of five deployments and a minimum of 45 minutes filming duration is required to study fish assemblages in these two habitats. For comparison of fish assemblages and assessment of habitat use by fish, mini stereo-RUVs were deployed in both habitats (three sites per habitat) and were left to record for 60 minutes for a v total of five sampling occasions in seagrass and seven sampling occasions in macroalga between 7 September 2020 and 9 April 2021. Collected videos were analysed, with relative abundance (MaxN), richness and fish length extracted. Fish behaviour was also analysed and compared between habitats. Mean fish MaxN was slightly higher in Z. capensis (3.4) than in P. corallorhiza (2.9), although this result was not significant. Species diversity was significantly higher in P. corallorhiza as shown by both richness (Z. capensis = 11 and P. corallorhiza = 18) and the Shannon diversity index (Z. capensis = 1.3 and P. corallorhiza = 1.7). Both habitats were dominated by species from the family Sparidae, with six estuary-associated marine species common between the two habitats. Both Z. capensis and P. corallorhiza were dominated by juvenile fish, with more than 70 % of measured fish being juveniles. Fish length was not significantly different in the two habitats. Juvenile fish assemblages were significantly distinct between the two habitats (ANOSIM). In terms of habitat use, fish behaviour analysis showed that fish use both habitats as nurseries. There was no significant difference in fish behaviour in the two habitats and fish behaviours associated with higher levels of habitat use (slow meandering and feeding) were the most common behaviours in both habitats. Although not significant, feeding behaviour (also associated with a high degree of habitat use) was observed more in macroalga than in the seagrass habitat. Although none of the studied complexity indices could be related to abundance, both leaf/blade width and Fractal Dimension showed a positive relationship with the number of species recorded, while canopy height showed a strong negative relationship with the number of species. Overall, this study shows that Plocamium corallorhiza red macroalga in the shallow marine environment may be as important in shallow marine environments as Zostera capensis seagrass in estuaries as nursery habitats for marine fi , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
- Full Text:
- Date Issued: 2022-12
Hooked on Gqom: an ethnographic study of a contemporary urban youth musical identity in South Africa
- Katushabe,Bathandwa Mathias Ngasiirwe
- Authors: Katushabe,Bathandwa Mathias Ngasiirwe
- Date: 2022-12
- Subjects: Electric dance Music -- South Africa -- Durban , Kwaito Music -- Social Ascpects -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59326 , vital:62045
- Description: Gqom music has grown from being a relatively obscure sub-genre of South African Kwaito into a globally recognised sonic identity and social movement. Gqom, as a distinct music style, has featured heavily in mass media since 2015, spawning social phenomena such as viral dance challenges on various social media platforms, and constituting a launch pad for the careers of musicians such as DJ Lag and the Distruction Boyz. Gqom also featured in the international motion picture Black Panther in 2018, and in the 2019 Lion King: The Gift album by American pop icon Beyoncé. Although the origins of Gqom, its characteristics, impact, and ascension to noteworthiness have received attention in the form of newspaper articles, online blogs, YouTube documentaries, etc, and small treatises or academic articles, little literature has been generated about the music and its theoretical construction as sonic and social phenomena. I argue that by using the theoretical scaffolds of ‘identity politics’, specifically ‘identities in music’, one is better able to understand Gqom as reflective of a broader social urban youth identity characterised by partying and political disillusionment. In other words, I make the case for an intergroup identification that prioritises in-group musical identities associated with Gqom and its phenomenology of practices which I have excavated using an ethnographic qualitative method. , Thesis (MMus) -- Faculty of Humanities, School of Visual and performing Arts, 2022
- Full Text:
- Date Issued: 2022-12
Hooked on Gqom: an ethnographic study of a contemporary urban youth musical identity in South Africa
- Authors: Katushabe,Bathandwa Mathias Ngasiirwe
- Date: 2022-12
- Subjects: Electric dance Music -- South Africa -- Durban , Kwaito Music -- Social Ascpects -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/59326 , vital:62045
- Description: Gqom music has grown from being a relatively obscure sub-genre of South African Kwaito into a globally recognised sonic identity and social movement. Gqom, as a distinct music style, has featured heavily in mass media since 2015, spawning social phenomena such as viral dance challenges on various social media platforms, and constituting a launch pad for the careers of musicians such as DJ Lag and the Distruction Boyz. Gqom also featured in the international motion picture Black Panther in 2018, and in the 2019 Lion King: The Gift album by American pop icon Beyoncé. Although the origins of Gqom, its characteristics, impact, and ascension to noteworthiness have received attention in the form of newspaper articles, online blogs, YouTube documentaries, etc, and small treatises or academic articles, little literature has been generated about the music and its theoretical construction as sonic and social phenomena. I argue that by using the theoretical scaffolds of ‘identity politics’, specifically ‘identities in music’, one is better able to understand Gqom as reflective of a broader social urban youth identity characterised by partying and political disillusionment. In other words, I make the case for an intergroup identification that prioritises in-group musical identities associated with Gqom and its phenomenology of practices which I have excavated using an ethnographic qualitative method. , Thesis (MMus) -- Faculty of Humanities, School of Visual and performing Arts, 2022
- Full Text:
- Date Issued: 2022-12