Preparation and application of plasmon metal enhanced titanium dioxide photocatalyst for the removal of organics in water
- Authors: Nyamukamba, Pardon
- Date: 2016
- Subjects: Water -- Purification -- Photocatalysis Titanium dioxide Water chemistry
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2765 , vital:28074
- Description: Advanced oxidation processes are capable of removing organic compounds that cannot be removed by conventional water treatment methods. Among the oxidation processes, photo-catalysis using titanium dioxide (TiO2) is a promising method but suffers from rapid electron-hole recombination rates and only absorbs UV light which is a small percentage (5 percent) of the total solar radiation. Therefore there is a need to reduce the recombination rates and also extend the absorption of the photo-catalyst into the visible region which constitutes 55 percent of the total solar radiation. The major aims of this study were to prepare plasmon metal decorated and doped TiO2 photo-catalysts immobilized on quartz substrates and test their photo-catalytic and antimicrobial activities. The effect of film thickness (loading) and use of different shapes of plasmon metal nanostructures was investigated. TiO2 thin films were prepared by a sputter coating technique while plasmon metal (Au & Ag)/carbon co-doped TiO2 by a simple sol gel process and plasmon metal films were prepared by the thermal evaporation technique. Different plasmon metal nanostructures (nanorods, dendrites, nanowires and spherical nanoparticles) were prepared using a wet chemical technique using sodium borohydride as the reducing agent. Nanocomposites of co-doped TiO2 photo-catalyst and plasmon elements of different proportions were also prepared. The prepared photo-catalysts were coated onto etched and MPTMS (3-Mercaptopropyl trimethoxysliane) treated quartz glass substrate which is a stable support favouring easy recovery. The prepared materials were characterized by XRD, HRTEM, TEM, HRSEM, FT-IR, SEM, PIXE and TGA while the doped TiO2 was characterized by XPS, BET, CHNS and Raman Spectroscopy. The effect of pH of solution, presence of other contaminants and salts in solution, initial concentration of the model pollutant and type of the plasmonic elements on the photocatalytic activity of TiO2 towards 4-(4-sulfophenylazo)-N,N-dimethyl aniline (methyl orange) were also investigated. The selected TiO2 photo-catalyst films were tested for antimicrobial properties. The effect of different types of plasmon elements on the antimicrobial activity of TiO2 against E. coli ATCC 3695 was evaluated under both sunlight and weak UV light. Under UV light, Ag showed the highest enhancement in photo-catalytic activity of TiO2 than Au and Cu. The photo-catalytic activity of TiO2 increased with an increase in Ag content to an optimum loading and then started to decrease with a further increase in loading. For Cu and Au, photo-activity activity increased with an increase in plasmon metal content. Under sunlight, Cu showed the highest enhancement of TiO2 photocatalytic compared to Ag and Au. The change in order of deposition showed that Au films enhanced the photo-activity better when they were deposited underneath rather than on top of TiO2 on quartz supports but Ag films performed better in enhancing photo-activity when they were deposited on top of TiO2. The use of bimetallic layers and three layer systems of different plasmon elements enhanced photo-catalytic activity better than the use of a monometallic layer. The presence of other organic contaminants and salts in solutions was found to reduce the photo-degradation of methyl orange due to preferential adsorption of other contaminants. When the pH was increased, the photocatalytic activity of TiO2 towards methyl orange was reduced. In antimicrobial studies, it was found that the plasmon elements greatly improved the antibacterial action of TiO2 against Escherichia coli ATCC 3695 in water and the best antibacterial action was observed with silver/carbon co-doped TiO2 photo-catalyst under sunlight The doped samples consisted of polydisperse nanoparticles which were found to be beneficial for photo-catalytic activity enhancement under sunlight.
- Full Text:
- Authors: Nyamukamba, Pardon
- Date: 2016
- Subjects: Water -- Purification -- Photocatalysis Titanium dioxide Water chemistry
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2765 , vital:28074
- Description: Advanced oxidation processes are capable of removing organic compounds that cannot be removed by conventional water treatment methods. Among the oxidation processes, photo-catalysis using titanium dioxide (TiO2) is a promising method but suffers from rapid electron-hole recombination rates and only absorbs UV light which is a small percentage (5 percent) of the total solar radiation. Therefore there is a need to reduce the recombination rates and also extend the absorption of the photo-catalyst into the visible region which constitutes 55 percent of the total solar radiation. The major aims of this study were to prepare plasmon metal decorated and doped TiO2 photo-catalysts immobilized on quartz substrates and test their photo-catalytic and antimicrobial activities. The effect of film thickness (loading) and use of different shapes of plasmon metal nanostructures was investigated. TiO2 thin films were prepared by a sputter coating technique while plasmon metal (Au & Ag)/carbon co-doped TiO2 by a simple sol gel process and plasmon metal films were prepared by the thermal evaporation technique. Different plasmon metal nanostructures (nanorods, dendrites, nanowires and spherical nanoparticles) were prepared using a wet chemical technique using sodium borohydride as the reducing agent. Nanocomposites of co-doped TiO2 photo-catalyst and plasmon elements of different proportions were also prepared. The prepared photo-catalysts were coated onto etched and MPTMS (3-Mercaptopropyl trimethoxysliane) treated quartz glass substrate which is a stable support favouring easy recovery. The prepared materials were characterized by XRD, HRTEM, TEM, HRSEM, FT-IR, SEM, PIXE and TGA while the doped TiO2 was characterized by XPS, BET, CHNS and Raman Spectroscopy. The effect of pH of solution, presence of other contaminants and salts in solution, initial concentration of the model pollutant and type of the plasmonic elements on the photocatalytic activity of TiO2 towards 4-(4-sulfophenylazo)-N,N-dimethyl aniline (methyl orange) were also investigated. The selected TiO2 photo-catalyst films were tested for antimicrobial properties. The effect of different types of plasmon elements on the antimicrobial activity of TiO2 against E. coli ATCC 3695 was evaluated under both sunlight and weak UV light. Under UV light, Ag showed the highest enhancement in photo-catalytic activity of TiO2 than Au and Cu. The photo-catalytic activity of TiO2 increased with an increase in Ag content to an optimum loading and then started to decrease with a further increase in loading. For Cu and Au, photo-activity activity increased with an increase in plasmon metal content. Under sunlight, Cu showed the highest enhancement of TiO2 photocatalytic compared to Ag and Au. The change in order of deposition showed that Au films enhanced the photo-activity better when they were deposited underneath rather than on top of TiO2 on quartz supports but Ag films performed better in enhancing photo-activity when they were deposited on top of TiO2. The use of bimetallic layers and three layer systems of different plasmon elements enhanced photo-catalytic activity better than the use of a monometallic layer. The presence of other organic contaminants and salts in solutions was found to reduce the photo-degradation of methyl orange due to preferential adsorption of other contaminants. When the pH was increased, the photocatalytic activity of TiO2 towards methyl orange was reduced. In antimicrobial studies, it was found that the plasmon elements greatly improved the antibacterial action of TiO2 against Escherichia coli ATCC 3695 in water and the best antibacterial action was observed with silver/carbon co-doped TiO2 photo-catalyst under sunlight The doped samples consisted of polydisperse nanoparticles which were found to be beneficial for photo-catalytic activity enhancement under sunlight.
- Full Text:
Self-reflection practices of school-management teams in the Capricorn District : towards a reflective management strategy for South African schools
- Authors: Malatji, Khashane Stephen
- Date: 2016
- Subjects: School management teams -- South Africa Educational leadership -- South Africa School management and organization -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/3021 , vital:28238
- Description: The study investigated the self-reflection practices of School Management Teams (SMTs) in the Capricorn District. The purpose of the study was to establish self-reflective practices employed by SMT in performing their management functions, and to suggest a reflective model for the enhancement of SMT performance. The study followed the qualitative approach with a case-study research design. The population consisted of SMTs from primary, secondary and special schools. Purposive sampling was utilised to select 8 Head of Departments from less experienced to more experienced in management positions, while 9 principal and 9 deputy principals were randomly selected. Literature reviewed focused on the aims of self-reflection; the functions of SMT; the strengths and weaknesses of self-reflection; self-reflective practices and enhanced performance; models of school management; challenges in school management; and previous studies on SMT and school management. Henderson’s Ethical Model of Enquiry on reflective practice was used. The theory discusses what characterises reflective practitioners. Data was collected from quest views, individual interviews and focus group interviews. The interpretation and understanding were organised in the form of descriptive accounts. Tape-recorded interviews and data from quest views were transcribed verbatim. After transcribing data a sense of the whole was obtained by reading carefully with understanding, and then summarizing the salient aspects. Themes were identified from the responses and discussed. The study found that SMT members were not fully aware of all of their daily functions and poor reflective practices made it difficult for them to effectively fulfil their management functions. Furthermore, the study revealed that SMT members experienced challenges, such as dealing with unprofessional teachers, poor parental involvement, poor communication, poor infrastructure and lack of resources amd these impacted negatively on their performance. The study provided insights into the practice of self-reflection and how SMT members could become reflective practitioners. A new framework was suggested that SMTs should continuously and critically reflect on their management practices and decisions. The study recommends that SMT be trained and oriented about management functions prior to their appointment in the positions. The study further recommends that SMTs consider self-reflection as part of their daily activities.
- Full Text:
- Authors: Malatji, Khashane Stephen
- Date: 2016
- Subjects: School management teams -- South Africa Educational leadership -- South Africa School management and organization -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/3021 , vital:28238
- Description: The study investigated the self-reflection practices of School Management Teams (SMTs) in the Capricorn District. The purpose of the study was to establish self-reflective practices employed by SMT in performing their management functions, and to suggest a reflective model for the enhancement of SMT performance. The study followed the qualitative approach with a case-study research design. The population consisted of SMTs from primary, secondary and special schools. Purposive sampling was utilised to select 8 Head of Departments from less experienced to more experienced in management positions, while 9 principal and 9 deputy principals were randomly selected. Literature reviewed focused on the aims of self-reflection; the functions of SMT; the strengths and weaknesses of self-reflection; self-reflective practices and enhanced performance; models of school management; challenges in school management; and previous studies on SMT and school management. Henderson’s Ethical Model of Enquiry on reflective practice was used. The theory discusses what characterises reflective practitioners. Data was collected from quest views, individual interviews and focus group interviews. The interpretation and understanding were organised in the form of descriptive accounts. Tape-recorded interviews and data from quest views were transcribed verbatim. After transcribing data a sense of the whole was obtained by reading carefully with understanding, and then summarizing the salient aspects. Themes were identified from the responses and discussed. The study found that SMT members were not fully aware of all of their daily functions and poor reflective practices made it difficult for them to effectively fulfil their management functions. Furthermore, the study revealed that SMT members experienced challenges, such as dealing with unprofessional teachers, poor parental involvement, poor communication, poor infrastructure and lack of resources amd these impacted negatively on their performance. The study provided insights into the practice of self-reflection and how SMT members could become reflective practitioners. A new framework was suggested that SMTs should continuously and critically reflect on their management practices and decisions. The study recommends that SMT be trained and oriented about management functions prior to their appointment in the positions. The study further recommends that SMTs consider self-reflection as part of their daily activities.
- Full Text:
Smallholder farmer's adoption decision-making processes in the utilisation of soil conservation practices in South Africa: the case of Qamata Irrigation Scheme, in the Eastern Cape
- Authors: David, Ighodaro Ikponmwosa
- Date: 2016
- Subjects: Qamata Irrigation Scheme (South Africa) Irrigation -- South Africa -- Eastern Cape Farm management -- South Africa -- Decision making , Farms, Small -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/1740 , vital:27554
- Description: The goal of this study was to determine the nature and factors influencing smallholder farmers in their adoption decision-making regarding the use of soil conservation practices introduced by extension practitioners in South Africa, using the case of farming at Qamata Irrigation Scheme, Eastern Cape. Using a central argument (thesis statement), the study argued that an adequate understanding and definition of smallholder farmers’ adoption decision-making process is very crucial to solving the problem of soil erosion/ degradation problem amongst smallholder farmers. Adopting the case study research design, information from 70 crop farmers (in a farmer focus group interviews) form the basis of the study. Basic models of analysis were the multiple, probit and logit, as well as the binary logistic regression analyses. According to the empirical results, perception was found very relevant in adoption decision-making, interacting positively and significantly with eight of the seventeen adoption variables chosen for the study. The indication therefore is that age (p<0.050), education (p<0.0030), and marriage (p<0.036), have more potentials to improve farmers’ perception. Similarly, higher farmer incomes (from crops [p<0.017], off-farm [p<0.038] and overall [p<0.011] income) also have a likelihood to improve farmers’ perception regarding soil conservation, for improved adoption. Further indication is that farmers who are aware (p<0.015) of the soil practices introduced by extension are also those who participate in their use (p<0.041). Employing the binary logistic, probit and logit regression models, results suggest that the nature of adoption decision-making processes of smallholder farmers is complex (not straight), being influenced by multiple factors. While age (p<0.099), gender (p<0.031), total income (p<0.081) impacted positively significant on smallholder farmers’ adoption decision-making, marital status (p<0.025), sources of land (p<0.063), length of continuously farming on same piece of land (p<0.013), and level of crop production (p<0.002) impacted negatively. The indication therefore was that older farmers preferred their own practices to the recommended practices by extension, which is in line with literature. Also as expected, more females preferred their own practices to extension recommended, while more males preferred the recommended practices. Similarly, marriage, land ownership, farming continuously on a spot for a long period, as well as increase in the level of crop production, all had a propensity to influence farmers toward the adoption of extension recommended practices as against farmers’ practices. Further results indicate, that farmers’ education (p<0.032), household size (p<0.37), and income (off-farm [p<0.036] and total [p<0.004]), measures used to measure farmers’ livelihood standards in the study, were positively significant in association with adoption. The indication was that, adoption decision-making is potentially capable of improving education level of farmers; increase the size of household, thus providing easy family labour; and as well improve level of income for the farmer. Based on the foregoing, the suggestion therefore is that any technology intervention programme that will succeed must begin with a clear understanding and analysis of farmers’ adoption process. This is better achieved when the adoption process is seen as a four-stage process, where the farmer first forms a view about the innovation (perception stage), and then decides whether or not to use it (adoption stage), as well as how much of the innovation to adopt (level of adoption stage), and finally how much is this innovation going to affect my livelihood (impact of adoption stage). Also, due to the particular relevance of perception in the adoption decision-making process, technology disseminators (extension), researchers and policy makers alike must never conclude on the rejection of any technology, not until factors determining perception of individuals have been well studied. The notion here is that, even at the confirmation stage of the adoption process of an individual adopter, when a rejection is confirmed, for an example, analysing factors of the adopter’s perception at play at the particular time of the innovation in question, could go a long way to redirecting the course of the adoption process of the said individual.
- Full Text:
- Authors: David, Ighodaro Ikponmwosa
- Date: 2016
- Subjects: Qamata Irrigation Scheme (South Africa) Irrigation -- South Africa -- Eastern Cape Farm management -- South Africa -- Decision making , Farms, Small -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/1740 , vital:27554
- Description: The goal of this study was to determine the nature and factors influencing smallholder farmers in their adoption decision-making regarding the use of soil conservation practices introduced by extension practitioners in South Africa, using the case of farming at Qamata Irrigation Scheme, Eastern Cape. Using a central argument (thesis statement), the study argued that an adequate understanding and definition of smallholder farmers’ adoption decision-making process is very crucial to solving the problem of soil erosion/ degradation problem amongst smallholder farmers. Adopting the case study research design, information from 70 crop farmers (in a farmer focus group interviews) form the basis of the study. Basic models of analysis were the multiple, probit and logit, as well as the binary logistic regression analyses. According to the empirical results, perception was found very relevant in adoption decision-making, interacting positively and significantly with eight of the seventeen adoption variables chosen for the study. The indication therefore is that age (p<0.050), education (p<0.0030), and marriage (p<0.036), have more potentials to improve farmers’ perception. Similarly, higher farmer incomes (from crops [p<0.017], off-farm [p<0.038] and overall [p<0.011] income) also have a likelihood to improve farmers’ perception regarding soil conservation, for improved adoption. Further indication is that farmers who are aware (p<0.015) of the soil practices introduced by extension are also those who participate in their use (p<0.041). Employing the binary logistic, probit and logit regression models, results suggest that the nature of adoption decision-making processes of smallholder farmers is complex (not straight), being influenced by multiple factors. While age (p<0.099), gender (p<0.031), total income (p<0.081) impacted positively significant on smallholder farmers’ adoption decision-making, marital status (p<0.025), sources of land (p<0.063), length of continuously farming on same piece of land (p<0.013), and level of crop production (p<0.002) impacted negatively. The indication therefore was that older farmers preferred their own practices to the recommended practices by extension, which is in line with literature. Also as expected, more females preferred their own practices to extension recommended, while more males preferred the recommended practices. Similarly, marriage, land ownership, farming continuously on a spot for a long period, as well as increase in the level of crop production, all had a propensity to influence farmers toward the adoption of extension recommended practices as against farmers’ practices. Further results indicate, that farmers’ education (p<0.032), household size (p<0.37), and income (off-farm [p<0.036] and total [p<0.004]), measures used to measure farmers’ livelihood standards in the study, were positively significant in association with adoption. The indication was that, adoption decision-making is potentially capable of improving education level of farmers; increase the size of household, thus providing easy family labour; and as well improve level of income for the farmer. Based on the foregoing, the suggestion therefore is that any technology intervention programme that will succeed must begin with a clear understanding and analysis of farmers’ adoption process. This is better achieved when the adoption process is seen as a four-stage process, where the farmer first forms a view about the innovation (perception stage), and then decides whether or not to use it (adoption stage), as well as how much of the innovation to adopt (level of adoption stage), and finally how much is this innovation going to affect my livelihood (impact of adoption stage). Also, due to the particular relevance of perception in the adoption decision-making process, technology disseminators (extension), researchers and policy makers alike must never conclude on the rejection of any technology, not until factors determining perception of individuals have been well studied. The notion here is that, even at the confirmation stage of the adoption process of an individual adopter, when a rejection is confirmed, for an example, analysing factors of the adopter’s perception at play at the particular time of the innovation in question, could go a long way to redirecting the course of the adoption process of the said individual.
- Full Text:
Synthesis and characterization of group 12 dithiolate complexes as single source precursors for the preparation of hexadecylamine capped metal sulfide nanoparticles and polymer
- Authors: Osuntokun, Jejenija
- Date: 2016
- Subjects: Nanotechnology Nanoparticles Semiconductors
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/14060 , vital:39801
- Description: A series of heteroleptic mixed ligand complexes of some alkyl substituted thiourea, tetramethyl thiuram disulfide and 1-cyano-1-carboethoxy-2,2 ditholate of Zn(II) Cd(II) and Hg(II) have been synthesized by stoichiometry reactions of the ligands with respective metal salts. They have been characterized with analytical and spectroscopic techniques. Seven out of the 19 complexes synthesized are pyridine 2, 2 bipyridine and 1, 10 phenanthroline adducts of dissopropyl parent adducts of Zn(II) and Cd(II) complexes. All the complexes are proposed as four coordinate except the pyridine adducts, 2, 2’ bipyridine and 1, 10 phenanhroline adducts that are proposed as five and six coordinate respectively. All the complexes are solid, air stable and moisture stable for a many months. They are not soluble in common organic solvents but partially soluble in coordinating solvents like DMF and DMSO and due to their insolubility problems all attempts to grow single crystal of the complexes proved abortive. The complexes gave respective metal sulfide on thermal decomposition in TGA and this makes them to be potentially useful single source precursor for the synthesis of metal sulfide. All the complexes were invariably thermolysed in HDA to synthesis a series of HDA-capped ZnS, CdS and HgS nanoparticles. The optical properties of the nanoparticles reveal that they are all blue-shifted from the absorbance edge and this confirms quantum confinement of the nanoparticles. The transmittance electron microscope showed that the nanoparticles are in nanodimension. ZnS nanoparticles from the pyridine adducts gave HDA-capped ZnS nanoparticles with a mixture of hexagonal and cubic phases while the HDA capped CdS from the 2, 2 bipyridine and 1,10 phenanthroline gave anisotropic nanoparticles. The sizes of the CdS from the 1,10 phenanthroline adducts were also found to be biggest while CdS nanoparticles from 2,2 bipyridine adduct were also revealed to be bigger than the particle sizes obtained from the parent complex, (1-cyano-1 carboethoxyethylene-2,2-dithiolato- κ,S’S)-bis(N, N’-diisopropylthiourea -κS)cadmium(II). ZnS and CdS polymer encapsulated nanocomposites were also synthesized using a solution casting method. The polymers employed were; Polymethyl metharcrylate (PMMA), Poly(vinly alcohol) (PVA), and poly vinyl pyrrolidone (PVP). The structural and thermal properties of the pure polymers and the respective nanocomposites were investigated. It was observed that the ZnS/PVA and CdS/PVA were the most thermally stable composites when the thermal stability of the pure polymers were compared relative to the nanocomposites using data obtained from thermal decomposition results of the TGA.
- Full Text:
- Authors: Osuntokun, Jejenija
- Date: 2016
- Subjects: Nanotechnology Nanoparticles Semiconductors
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/14060 , vital:39801
- Description: A series of heteroleptic mixed ligand complexes of some alkyl substituted thiourea, tetramethyl thiuram disulfide and 1-cyano-1-carboethoxy-2,2 ditholate of Zn(II) Cd(II) and Hg(II) have been synthesized by stoichiometry reactions of the ligands with respective metal salts. They have been characterized with analytical and spectroscopic techniques. Seven out of the 19 complexes synthesized are pyridine 2, 2 bipyridine and 1, 10 phenanthroline adducts of dissopropyl parent adducts of Zn(II) and Cd(II) complexes. All the complexes are proposed as four coordinate except the pyridine adducts, 2, 2’ bipyridine and 1, 10 phenanhroline adducts that are proposed as five and six coordinate respectively. All the complexes are solid, air stable and moisture stable for a many months. They are not soluble in common organic solvents but partially soluble in coordinating solvents like DMF and DMSO and due to their insolubility problems all attempts to grow single crystal of the complexes proved abortive. The complexes gave respective metal sulfide on thermal decomposition in TGA and this makes them to be potentially useful single source precursor for the synthesis of metal sulfide. All the complexes were invariably thermolysed in HDA to synthesis a series of HDA-capped ZnS, CdS and HgS nanoparticles. The optical properties of the nanoparticles reveal that they are all blue-shifted from the absorbance edge and this confirms quantum confinement of the nanoparticles. The transmittance electron microscope showed that the nanoparticles are in nanodimension. ZnS nanoparticles from the pyridine adducts gave HDA-capped ZnS nanoparticles with a mixture of hexagonal and cubic phases while the HDA capped CdS from the 2, 2 bipyridine and 1,10 phenanthroline gave anisotropic nanoparticles. The sizes of the CdS from the 1,10 phenanthroline adducts were also found to be biggest while CdS nanoparticles from 2,2 bipyridine adduct were also revealed to be bigger than the particle sizes obtained from the parent complex, (1-cyano-1 carboethoxyethylene-2,2-dithiolato- κ,S’S)-bis(N, N’-diisopropylthiourea -κS)cadmium(II). ZnS and CdS polymer encapsulated nanocomposites were also synthesized using a solution casting method. The polymers employed were; Polymethyl metharcrylate (PMMA), Poly(vinly alcohol) (PVA), and poly vinyl pyrrolidone (PVP). The structural and thermal properties of the pure polymers and the respective nanocomposites were investigated. It was observed that the ZnS/PVA and CdS/PVA were the most thermally stable composites when the thermal stability of the pure polymers were compared relative to the nanocomposites using data obtained from thermal decomposition results of the TGA.
- Full Text:
The implementation of the inclusive education policy in sport: a case study of four secondary schools in Masvingo District, Zimbabwe
- Authors: Mudyahoto, Tapiwa
- Date: 2016
- Subjects: Inclusive education -- Zimbabwe Educational equalization -- Zimbabwe Physical education and training -- Study and teaching (Secondary) -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2116 , vital:27611
- Description: The purpose of the present study was to explore the implementation of the inclusive education policy in sport in four secondary schools in Masvingo District, Zimbabwe. The case study research design was employed; interviews, focus groups, document analysis and observations were used to collect data. Four school Heads, 4 sports masters, 4 team trainers, 4 team captains, 2 learners with disabilities and a district education officer were purposively selected to take part in this study. Data were presented, analysed/discussed, starting with demographic data in the first section followed by emerging themes. It emerged from the study that all the participants were not knowledgeable about inclusive education and the aspect of including learners with disabilities in mainstream sport. The major barriers identified include inadequate policy dialogue, unavailability of sporting equipment and attitudes. Further findings revealed that there is dire need for knowledge and skills in inclusive sport among teachers in regular schools. Findings also confirmed unavailability of policy circulars in schools. Most teachers were not afforded opportunities to attend workshops and seminars. Findings also revealed that teachers faced major challenges such as funding to undertake courses in SNE and inclusive sport. Teachers were reeled in with a lot of pressure due to congested timetables and large classes. Participants believed that the challenges they faced could be resolved through some proposed intervention strategies. The researcher concluded that teachers in regular schools were not equipped to teach sport to learners with special education needs in the mainstream. The MoPSE was not doing much in preparing teachers to be effective in including learners with disabilities in regular school sport. The study recommended that the MoPSE should put in place provisions to meet the inclusive needs of both teachers and learners. It also recommended that school Heads should be taught about SNE and inclusive sport for them to be able to guide teachers properly. Besides the national policy, schools should design inclusive policies specifically for their respective schools in line with the national policy. The study also recommended that the MoPSE should come up with a comprehensive framework in sport to counter some of these challenges.
- Full Text:
- Authors: Mudyahoto, Tapiwa
- Date: 2016
- Subjects: Inclusive education -- Zimbabwe Educational equalization -- Zimbabwe Physical education and training -- Study and teaching (Secondary) -- Zimbabwe
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2116 , vital:27611
- Description: The purpose of the present study was to explore the implementation of the inclusive education policy in sport in four secondary schools in Masvingo District, Zimbabwe. The case study research design was employed; interviews, focus groups, document analysis and observations were used to collect data. Four school Heads, 4 sports masters, 4 team trainers, 4 team captains, 2 learners with disabilities and a district education officer were purposively selected to take part in this study. Data were presented, analysed/discussed, starting with demographic data in the first section followed by emerging themes. It emerged from the study that all the participants were not knowledgeable about inclusive education and the aspect of including learners with disabilities in mainstream sport. The major barriers identified include inadequate policy dialogue, unavailability of sporting equipment and attitudes. Further findings revealed that there is dire need for knowledge and skills in inclusive sport among teachers in regular schools. Findings also confirmed unavailability of policy circulars in schools. Most teachers were not afforded opportunities to attend workshops and seminars. Findings also revealed that teachers faced major challenges such as funding to undertake courses in SNE and inclusive sport. Teachers were reeled in with a lot of pressure due to congested timetables and large classes. Participants believed that the challenges they faced could be resolved through some proposed intervention strategies. The researcher concluded that teachers in regular schools were not equipped to teach sport to learners with special education needs in the mainstream. The MoPSE was not doing much in preparing teachers to be effective in including learners with disabilities in regular school sport. The study recommended that the MoPSE should put in place provisions to meet the inclusive needs of both teachers and learners. It also recommended that school Heads should be taught about SNE and inclusive sport for them to be able to guide teachers properly. Besides the national policy, schools should design inclusive policies specifically for their respective schools in line with the national policy. The study also recommended that the MoPSE should come up with a comprehensive framework in sport to counter some of these challenges.
- Full Text:
The place of language policy in education in teaching and learning: a case study of two primary schools in the Eastern Cape Province
- Rani, Nomakhosazana Jeanette
- Authors: Rani, Nomakhosazana Jeanette
- Date: 2016
- Subjects: Language in education Language policy -- South Africa -- Eastern Cape Language planning -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2381 , vital:27792
- Description: This study investigates the implementation of Language in Education Policy (LiEP) in learning and teaching in grades six from two schools. It critically examines the teachers’ practices and experiences towards English as the language of learning and teaching (LoLT) at two different primary schools from the eMalahleni in the Lady Frere Education District in the Eastern Cape. The study is guided by the fact that most learners use their mother tongue (isiXhosa) in classroom as well as outside classroom contexts. Furthermore, some teachers use the translation method of teaching language as they code-switch to their home language when teaching content subjects as well as English. Despite this practice in class, learners are expected to answer their test and examination questions in English. Theoretically, this study is underpinned by the constructivist view of language learning (Gaserfeld, 2003) and English as an international language (Sivasubramaniam, 2011). On the basis of the ecological and the constructivist approaches to language learning, Sivasubramaniam (2011 p.53) views language as a creative instrument of meaning which ‘has the power to create meaning anew and afresh’ each time that someone uses it. The study makes use of the qualitative research method with a case study design that is placed within the interpretive paradigm. The data collected will be analysed through the use of critical discourse analysis. The findings from the study suggest some instrumental motivations to use English as LOLT which is informed by Language policy. Some of these motivations are: studying abroad, business with foreign investors and integrative motivations as the learner will be able to communicate with people from different countries. The study concludes that there is need for schools to stick to the English medium because this acts as an open door to the upward economic mobility among the previously disadvantaged. Based on this, it can be recommended that schools stick to English first additional language as their language of teaching and learning.
- Full Text:
- Authors: Rani, Nomakhosazana Jeanette
- Date: 2016
- Subjects: Language in education Language policy -- South Africa -- Eastern Cape Language planning -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2381 , vital:27792
- Description: This study investigates the implementation of Language in Education Policy (LiEP) in learning and teaching in grades six from two schools. It critically examines the teachers’ practices and experiences towards English as the language of learning and teaching (LoLT) at two different primary schools from the eMalahleni in the Lady Frere Education District in the Eastern Cape. The study is guided by the fact that most learners use their mother tongue (isiXhosa) in classroom as well as outside classroom contexts. Furthermore, some teachers use the translation method of teaching language as they code-switch to their home language when teaching content subjects as well as English. Despite this practice in class, learners are expected to answer their test and examination questions in English. Theoretically, this study is underpinned by the constructivist view of language learning (Gaserfeld, 2003) and English as an international language (Sivasubramaniam, 2011). On the basis of the ecological and the constructivist approaches to language learning, Sivasubramaniam (2011 p.53) views language as a creative instrument of meaning which ‘has the power to create meaning anew and afresh’ each time that someone uses it. The study makes use of the qualitative research method with a case study design that is placed within the interpretive paradigm. The data collected will be analysed through the use of critical discourse analysis. The findings from the study suggest some instrumental motivations to use English as LOLT which is informed by Language policy. Some of these motivations are: studying abroad, business with foreign investors and integrative motivations as the learner will be able to communicate with people from different countries. The study concludes that there is need for schools to stick to the English medium because this acts as an open door to the upward economic mobility among the previously disadvantaged. Based on this, it can be recommended that schools stick to English first additional language as their language of teaching and learning.
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The role of intergroup conflict in school-based violence in the Johannesburg Central Education District Schools: towards a strategy for peace education implementation
- Authors: Mkhomi, Moses Sipho
- Date: 2016
- Subjects: School violence -- South Africa -- Johannesburg School discipline -- South Africa -- Johannesburg School crisis management -- South Africa -- Johannesburg Juvenile delinquency -- South Africa -- Johannesburg
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2304 , vital:27750
- Description: School-Based Violence (SBV) is prevalent in South Africa and globally. SBV is one of the challenges that the South African education system is facing resulting in a new deep-rooted culture of unsafe and insecure schools. Teachers are expected to teach learners, who display antisocial behaviour. These learners swear, back chat, verbally and physically abuse and show total disrespect for teachers. The presence of such learners has turned schools into battle field. This violence is not exclusively directed to teachers, but learners are also the common victims of bullying in particular. This study therefore sought to investigate how intergroup violence impacts on the schoolbased violence. The concepts, Intergroup Conflict (IC) and gangs/gangsterism were used interchangeably to describe actions of individuals who take part in the social conflict, driven by competition, antagonism and aggression within the school context.
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- Authors: Mkhomi, Moses Sipho
- Date: 2016
- Subjects: School violence -- South Africa -- Johannesburg School discipline -- South Africa -- Johannesburg School crisis management -- South Africa -- Johannesburg Juvenile delinquency -- South Africa -- Johannesburg
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2304 , vital:27750
- Description: School-Based Violence (SBV) is prevalent in South Africa and globally. SBV is one of the challenges that the South African education system is facing resulting in a new deep-rooted culture of unsafe and insecure schools. Teachers are expected to teach learners, who display antisocial behaviour. These learners swear, back chat, verbally and physically abuse and show total disrespect for teachers. The presence of such learners has turned schools into battle field. This violence is not exclusively directed to teachers, but learners are also the common victims of bullying in particular. This study therefore sought to investigate how intergroup violence impacts on the schoolbased violence. The concepts, Intergroup Conflict (IC) and gangs/gangsterism were used interchangeably to describe actions of individuals who take part in the social conflict, driven by competition, antagonism and aggression within the school context.
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The role of the office of the auditor general of South Africa in enhancing sound public financial management, with special references to the Eastern Cape Province
- Deliwe, Mawonga Christopher C
- Authors: Deliwe, Mawonga Christopher C
- Date: 2016
- Subjects: South Africa -- Office of the Auditor-General Finance, Public -- South Africa -- Auditing Auditing -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2017 , vital:27596
- Description: The 1996 Constitution of South Africa and the Public Audit Act of 2004 provide the legislative framework for the Office of the Auditor General of South Africa (OAGSA). The Independent Regulatory Board for Auditors further enriched the interpretation of the framework – for government auditing. Over the years of democratic rule in South Africa, audit performance by State organs was generally poor. Despite the efforts by the OAGSA to improve the performance, very little improvement was notable. Most disturbing was the observation that there was widespread, a prevalence of recurring findings, which indicated that the OAGSA’s recommendations and guidelines were not acted upon, or largely ignored. Firstly, the research study established that the system of capitalist democracy, which comes in different varieties throughout world democracies, indeed brought about a situation where the electorate was effectively removed from its rightful place of being the principal, and had its place taken up by political parties (which are in fact, agents) - which (parties) governed on its (the electorate’s) behalf. This system, taken together with the Principal Agency and the Rational Choice Theories – fully explained the prevalence of maladministration and malfeasance in government in South Africa. Secondly, the study established that the OAGSA has done everything imaginable in its attempts to improve audit performance in government institutions – using the carrot rather than the stick approach. The legislative framework cited above, revealed that the OAGSA has the power to audit and report, while Parliament has the power to enforce corrective action. The lesson of this revelation is: that there is not much that the OAGSA can achieve without a high level of cooperation between itself and Parliament – if audit performance is to be effectively, and appreciably improved in South Africa. A disappointing discovery however was indirectly delivered to the world, through the results of a research study conducted by one Wehner in 2002, on Public Accounts Committees (PACs) (alias Standing Committees on Public Accounts (SCOPAs)) in world democracies. The Wehner study clearly demonstrated that there was nothing contained in these committees’ founding documents or enabling legislation – which in no uncertain terms, directed the committees on what procedures and processes to follow to ensure that their resolutions were acted upon. In other words there was no enforcement mechanism discernible for their resolutions. Thirdly, there were developments in case law in South Africa, which augured well for Constitutional Institutions in general. They are contained in court judgements relating to the mandate of the Office of the Public Protector (OPP). The question at the core of these developments was: whether the decisions or remedial action emanating from the OPP, were binding and enforceable. Two judgements cited as cases in point, one a High Court judgment and another a Supreme Court of Appeal’s (SCA’s), feature in the research report. The SCA, in summary found that decisions of administrative bodies of State – stand in fact and in law, until such time that a court of law invalidates them. The SCA ruled through citing a High Court judgement passed way back in 2004 - that Constitutional Institutions, although not organs of State per se – were certainly included in this 2004 finding, if one considers the rationale of this initial finding, taken together with the purpose for which Constitutional Institutions were established in South Africa in the first place. In conclusion, although visible root causes of poor audit findings appear overall to be poor consequence management and questionable leadership quality in government, the system of capitalist democracy is ultimately to blame. The system certainly had unintended consequences.
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- Authors: Deliwe, Mawonga Christopher C
- Date: 2016
- Subjects: South Africa -- Office of the Auditor-General Finance, Public -- South Africa -- Auditing Auditing -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/2017 , vital:27596
- Description: The 1996 Constitution of South Africa and the Public Audit Act of 2004 provide the legislative framework for the Office of the Auditor General of South Africa (OAGSA). The Independent Regulatory Board for Auditors further enriched the interpretation of the framework – for government auditing. Over the years of democratic rule in South Africa, audit performance by State organs was generally poor. Despite the efforts by the OAGSA to improve the performance, very little improvement was notable. Most disturbing was the observation that there was widespread, a prevalence of recurring findings, which indicated that the OAGSA’s recommendations and guidelines were not acted upon, or largely ignored. Firstly, the research study established that the system of capitalist democracy, which comes in different varieties throughout world democracies, indeed brought about a situation where the electorate was effectively removed from its rightful place of being the principal, and had its place taken up by political parties (which are in fact, agents) - which (parties) governed on its (the electorate’s) behalf. This system, taken together with the Principal Agency and the Rational Choice Theories – fully explained the prevalence of maladministration and malfeasance in government in South Africa. Secondly, the study established that the OAGSA has done everything imaginable in its attempts to improve audit performance in government institutions – using the carrot rather than the stick approach. The legislative framework cited above, revealed that the OAGSA has the power to audit and report, while Parliament has the power to enforce corrective action. The lesson of this revelation is: that there is not much that the OAGSA can achieve without a high level of cooperation between itself and Parliament – if audit performance is to be effectively, and appreciably improved in South Africa. A disappointing discovery however was indirectly delivered to the world, through the results of a research study conducted by one Wehner in 2002, on Public Accounts Committees (PACs) (alias Standing Committees on Public Accounts (SCOPAs)) in world democracies. The Wehner study clearly demonstrated that there was nothing contained in these committees’ founding documents or enabling legislation – which in no uncertain terms, directed the committees on what procedures and processes to follow to ensure that their resolutions were acted upon. In other words there was no enforcement mechanism discernible for their resolutions. Thirdly, there were developments in case law in South Africa, which augured well for Constitutional Institutions in general. They are contained in court judgements relating to the mandate of the Office of the Public Protector (OPP). The question at the core of these developments was: whether the decisions or remedial action emanating from the OPP, were binding and enforceable. Two judgements cited as cases in point, one a High Court judgment and another a Supreme Court of Appeal’s (SCA’s), feature in the research report. The SCA, in summary found that decisions of administrative bodies of State – stand in fact and in law, until such time that a court of law invalidates them. The SCA ruled through citing a High Court judgement passed way back in 2004 - that Constitutional Institutions, although not organs of State per se – were certainly included in this 2004 finding, if one considers the rationale of this initial finding, taken together with the purpose for which Constitutional Institutions were established in South Africa in the first place. In conclusion, although visible root causes of poor audit findings appear overall to be poor consequence management and questionable leadership quality in government, the system of capitalist democracy is ultimately to blame. The system certainly had unintended consequences.
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Trade liberalisation, the real exchange rate and sectoral employment : a case study of South Africa
- Authors: Sibanda, Kin
- Date: 2016
- Subjects: Foreign exchange rates Employment (Economic theory) Free trade -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/12777 , vital:39360
- Description: This study examined the relationship between trade liberalisation, the real exchange rate and sectoral employment in South Africa for the period 1994 to 2014. Firstly, using quarterly time series data, the Autoregressive Distributed Lag (ARDL) technique was employed to formally check if South African real exchange rates are responsive to trade liberalisation. This was done to see if trade liberalisation impacts real exchange rates in South Africa, to the extent that they cannot be controlled concurrently in the subsequent models. Based on the ARDL results, trade liberalisation does not have a significant effect on the exchange rate. However, when the real exchange rate is an independent variable of trade liberalisation, the results show that real exchange rates affect trade, specifically the export propensity index. The next step was to assess the impact of trade liberalisation and real exchange rate on sectoral employment using quarterly panel data for South Africa from 1994 to 2014 controlling for both sector-specific and macro-economic variables. The study employed diverse panel data analysis techniques to separate the sectoral effects, starting with broad sectors followed by the disaggregated sectors, to identify the sectors most affected by real exchange rates and trade liberalisation. The Generalised method of Moments (GMM) results reveal that a unit increase in exchange rate (implying appreciation), causes employment to go down by about 9 percent in South Africa. The same relationship is depicted from the Pooled Mean Group (PMG) estimations in both the short run and long run. Random coefficients (betas) show that the real exchange rate negatively affects the primary and secondary sector with a positive but insignificant effect on the tertiary sector. The sub-sectors negatively hit hard by real exchange rates are communication, mining and transport. The results also show that trade liberalisation is linked to both job destruction and job creation. The static models reveal that trade openness has a statistically positive and significant impact on employment in the short run while the PMG estimator results show that the effect is negative and only significant in the short run. The dynamic models (GMM and PMG) showed trade liberalisation (as proxied by trade openness and import propensity) has a statistical and significantly positive short run impact on employment. This implies that selective trade liberalisation strategies are needed in order for South Africa to maximise the gains from trade.
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- Authors: Sibanda, Kin
- Date: 2016
- Subjects: Foreign exchange rates Employment (Economic theory) Free trade -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/12777 , vital:39360
- Description: This study examined the relationship between trade liberalisation, the real exchange rate and sectoral employment in South Africa for the period 1994 to 2014. Firstly, using quarterly time series data, the Autoregressive Distributed Lag (ARDL) technique was employed to formally check if South African real exchange rates are responsive to trade liberalisation. This was done to see if trade liberalisation impacts real exchange rates in South Africa, to the extent that they cannot be controlled concurrently in the subsequent models. Based on the ARDL results, trade liberalisation does not have a significant effect on the exchange rate. However, when the real exchange rate is an independent variable of trade liberalisation, the results show that real exchange rates affect trade, specifically the export propensity index. The next step was to assess the impact of trade liberalisation and real exchange rate on sectoral employment using quarterly panel data for South Africa from 1994 to 2014 controlling for both sector-specific and macro-economic variables. The study employed diverse panel data analysis techniques to separate the sectoral effects, starting with broad sectors followed by the disaggregated sectors, to identify the sectors most affected by real exchange rates and trade liberalisation. The Generalised method of Moments (GMM) results reveal that a unit increase in exchange rate (implying appreciation), causes employment to go down by about 9 percent in South Africa. The same relationship is depicted from the Pooled Mean Group (PMG) estimations in both the short run and long run. Random coefficients (betas) show that the real exchange rate negatively affects the primary and secondary sector with a positive but insignificant effect on the tertiary sector. The sub-sectors negatively hit hard by real exchange rates are communication, mining and transport. The results also show that trade liberalisation is linked to both job destruction and job creation. The static models reveal that trade openness has a statistically positive and significant impact on employment in the short run while the PMG estimator results show that the effect is negative and only significant in the short run. The dynamic models (GMM and PMG) showed trade liberalisation (as proxied by trade openness and import propensity) has a statistical and significantly positive short run impact on employment. This implies that selective trade liberalisation strategies are needed in order for South Africa to maximise the gains from trade.
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