A self-emulsifying delivery system loaded with efavirenz: The case for flax-seed oil
- Authors: Mazonde, Priveledge
- Date: 2021-10-29
- Subjects: Drug delivery systems , Linseed oil , Antiretroviral agents , HIV (Viruses) , Drug carriers (Pharmacy) , Solubility , High performance liquid chromatography , Efavirenz
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/192944 , vital:45283
- Description: The feasibility of incorporating efavirenz (EFV), an antiretroviral agent against HIV into a lipid-based self-emulsifying drug delivery system (SEDDS) containing vegetable oils was investigated. EFV has poor aqueous solubility and is classified under the Biopharmaceutical Classification System (BCS) as a class II compound with highly permeability, its aqueous solubility is less than 10 mg/ml and is defined as a practically insoluble compound with a consequent poor bioavailability of approximately 40%, and erratic dissolution behaviour. SEDDS formulations have been shown to improve the aqueous solubility and consequently the bioavailability of BCS II compounds such as EFV. EFV is a first line antiviral agent used in combination with other agents in antiretroviral therapy (ART). Among the number of NNRTIs approved for use in HIV treatment, EFV is one of the most commonly prescribed drug. Statistical methods and Design of Experiments (DoE) using Response Surface Methodology (RSM), specifically a Central Composite Design (CCD), were used to facilitate the development of a reversed-phase high performance liquid chromatographic (HPLC) method for the quantitation of EFV during formulation product and process development studies. A rapid, accurate, precise and sensitive HPLC method with ultraviolet (UV) detection was developed, optimised and validated for the in-vitro analysis of EFV in a total run time under 10 minutes for the elution of both EFV and loratidine which was used as the internal standard (IS). The method was then successfully applied to the determination of EFV in commercially available tablets. Excipient screening was undertaken using solubility studies and revealed that EFV had highest solubility in flaxseed oil in comparison to soybean, macadamia, grapeseed, sunflower and olive oils. The non-ionic Tween® 80 and Span® 20 were selected as surfactant and co-surfactant, respectively with ethanol co-solvent as they exhibited improved miscibility with co-solvent. Pre-formulation studies were undertaken to investigate the compatibility of the API with excipients and to identify a nano-emulsion region and other emulsion types using pseudoternary phase diagrams. The phase behaviour of crude cold pressed flaxseed oil with the selected non-ionic surfactants revealed an area within pseudo-ternary phase diagrams for different surfactant-mixtures formed gels/semisolid structures which can be exploited for other drug delivery strategies that require such properties. Fourier transform infrared spectroscopy (FT-IR), powder x-ray diffraction (XRD) and Raman spectroscopy were used to identify and assess the compatibility of EFV with chosen excipients. 2 A reduction in the peak intensity was observed for EFV when combined with each hydrophobic/lipid excipient evaluated revealing that there was a marked reduction in the crystallinity of the EFV. A decrease in crystallinity in comparison with the bulk API may indicate that EFV were amorphous or sequestered in a molecular dispersion and exhibited an increased solubility for the molecule. Flaxseed oil was used as the oil phase in studies for the optimization of surfactant mixtures undertaken using DoE, specifically a D-optimal mixtures design with the flaxseed oil content set at 10% m/m was performed. Solutions from the desired optimization function were produced based on desirability and five nanoemulsion formulations were produced and characterized in terms of in vitro release of efavirenz, drug loading capacity, Zeta Potential, droplet sizes and polydispersity index (PDI). Kinetically stable nanoemulsions containing 10% m/m flaxseed oil were successfully manufactured and assessed. Droplet sizes ranged between 156 and 225 nm, Zeta Potential between −24 and −41 mV and all formulations were found to be monodisperse with polydispersity indices ≤ 0.487. SEDDS formulations of EFV in nano-sized carriers were developed and optimised, in vitro drug release varied with varying amounts of ethanol in the formulation producing formulations that exhibited differently modulated drug in-vitro release profiles that may be further manipulated for better performance and therapeutic outcomes in terms of solubility and possibly bioavailability of EFV when delivered using SEDDS rather than using tablets which in turn may lead to better therapeutic outcomes for patients with HIV. , Thesis (MSc) -- Faculty of Pharmacy, Pharmacy, 2021
- Full Text:
- Date Issued: 2021-10-29
- Authors: Mazonde, Priveledge
- Date: 2021-10-29
- Subjects: Drug delivery systems , Linseed oil , Antiretroviral agents , HIV (Viruses) , Drug carriers (Pharmacy) , Solubility , High performance liquid chromatography , Efavirenz
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/192944 , vital:45283
- Description: The feasibility of incorporating efavirenz (EFV), an antiretroviral agent against HIV into a lipid-based self-emulsifying drug delivery system (SEDDS) containing vegetable oils was investigated. EFV has poor aqueous solubility and is classified under the Biopharmaceutical Classification System (BCS) as a class II compound with highly permeability, its aqueous solubility is less than 10 mg/ml and is defined as a practically insoluble compound with a consequent poor bioavailability of approximately 40%, and erratic dissolution behaviour. SEDDS formulations have been shown to improve the aqueous solubility and consequently the bioavailability of BCS II compounds such as EFV. EFV is a first line antiviral agent used in combination with other agents in antiretroviral therapy (ART). Among the number of NNRTIs approved for use in HIV treatment, EFV is one of the most commonly prescribed drug. Statistical methods and Design of Experiments (DoE) using Response Surface Methodology (RSM), specifically a Central Composite Design (CCD), were used to facilitate the development of a reversed-phase high performance liquid chromatographic (HPLC) method for the quantitation of EFV during formulation product and process development studies. A rapid, accurate, precise and sensitive HPLC method with ultraviolet (UV) detection was developed, optimised and validated for the in-vitro analysis of EFV in a total run time under 10 minutes for the elution of both EFV and loratidine which was used as the internal standard (IS). The method was then successfully applied to the determination of EFV in commercially available tablets. Excipient screening was undertaken using solubility studies and revealed that EFV had highest solubility in flaxseed oil in comparison to soybean, macadamia, grapeseed, sunflower and olive oils. The non-ionic Tween® 80 and Span® 20 were selected as surfactant and co-surfactant, respectively with ethanol co-solvent as they exhibited improved miscibility with co-solvent. Pre-formulation studies were undertaken to investigate the compatibility of the API with excipients and to identify a nano-emulsion region and other emulsion types using pseudoternary phase diagrams. The phase behaviour of crude cold pressed flaxseed oil with the selected non-ionic surfactants revealed an area within pseudo-ternary phase diagrams for different surfactant-mixtures formed gels/semisolid structures which can be exploited for other drug delivery strategies that require such properties. Fourier transform infrared spectroscopy (FT-IR), powder x-ray diffraction (XRD) and Raman spectroscopy were used to identify and assess the compatibility of EFV with chosen excipients. 2 A reduction in the peak intensity was observed for EFV when combined with each hydrophobic/lipid excipient evaluated revealing that there was a marked reduction in the crystallinity of the EFV. A decrease in crystallinity in comparison with the bulk API may indicate that EFV were amorphous or sequestered in a molecular dispersion and exhibited an increased solubility for the molecule. Flaxseed oil was used as the oil phase in studies for the optimization of surfactant mixtures undertaken using DoE, specifically a D-optimal mixtures design with the flaxseed oil content set at 10% m/m was performed. Solutions from the desired optimization function were produced based on desirability and five nanoemulsion formulations were produced and characterized in terms of in vitro release of efavirenz, drug loading capacity, Zeta Potential, droplet sizes and polydispersity index (PDI). Kinetically stable nanoemulsions containing 10% m/m flaxseed oil were successfully manufactured and assessed. Droplet sizes ranged between 156 and 225 nm, Zeta Potential between −24 and −41 mV and all formulations were found to be monodisperse with polydispersity indices ≤ 0.487. SEDDS formulations of EFV in nano-sized carriers were developed and optimised, in vitro drug release varied with varying amounts of ethanol in the formulation producing formulations that exhibited differently modulated drug in-vitro release profiles that may be further manipulated for better performance and therapeutic outcomes in terms of solubility and possibly bioavailability of EFV when delivered using SEDDS rather than using tablets which in turn may lead to better therapeutic outcomes for patients with HIV. , Thesis (MSc) -- Faculty of Pharmacy, Pharmacy, 2021
- Full Text:
- Date Issued: 2021-10-29
A sensitive and reliable method for the detection of lipid peroxidation in biological tissues
- Anoopkumar-Dukie, Shailendra, Walker, Roderick B, Daya, Santylal
- Authors: Anoopkumar-Dukie, Shailendra , Walker, Roderick B , Daya, Santylal
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/184325 , vital:44208 , xlink:href="https://doi.org/10.1211/0022357011775299"
- Description: A simple, accurate and cost effective method has been designed for the determination of lipid peroxidation in biological tissue samples. The method was a modification and improvement on existing methods available for lipid peroxidation determination. Solid-phase extraction was used to separate the thiobarbituric acid–malondialdehyde complex from thiobarbituric acidreactive substances and HPLC was performed using a C18 (Waters Spherisorb, 5 µm, 250¬4.6 mm i.d.) column to achieve isolation of the complex. The procedure was validated with respect to linearity of calibration (0.998), precision, sensitivity and limits of quantitation (1 nmol mL−1) and detection (0.5 nmol mL−1). Resorcinol was used as an external standard. The method was tested by inducing free radical generation with a known free radical generator, quinolinic acid, in rat brain homogenate. The results showed that the method presented allowed detection of lipid peroxidation products at concentrations in the nanomolar (nM) range compared with the micromolar (µM) range detected by other methods, thus rendering it suitable for use with biological samples. In addition, the modified method allowed for detection of the purified lipid peroxidation products, thus eliminating the possibility of simultaneous detection of impurities that absorb at the same wavelength.
- Full Text:
- Date Issued: 2001
- Authors: Anoopkumar-Dukie, Shailendra , Walker, Roderick B , Daya, Santylal
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/184325 , vital:44208 , xlink:href="https://doi.org/10.1211/0022357011775299"
- Description: A simple, accurate and cost effective method has been designed for the determination of lipid peroxidation in biological tissue samples. The method was a modification and improvement on existing methods available for lipid peroxidation determination. Solid-phase extraction was used to separate the thiobarbituric acid–malondialdehyde complex from thiobarbituric acidreactive substances and HPLC was performed using a C18 (Waters Spherisorb, 5 µm, 250¬4.6 mm i.d.) column to achieve isolation of the complex. The procedure was validated with respect to linearity of calibration (0.998), precision, sensitivity and limits of quantitation (1 nmol mL−1) and detection (0.5 nmol mL−1). Resorcinol was used as an external standard. The method was tested by inducing free radical generation with a known free radical generator, quinolinic acid, in rat brain homogenate. The results showed that the method presented allowed detection of lipid peroxidation products at concentrations in the nanomolar (nM) range compared with the micromolar (µM) range detected by other methods, thus rendering it suitable for use with biological samples. In addition, the modified method allowed for detection of the purified lipid peroxidation products, thus eliminating the possibility of simultaneous detection of impurities that absorb at the same wavelength.
- Full Text:
- Date Issued: 2001
A simple quinoline-thiophene Schiff base turn-off chemosensor for Hg2+ detection
- Musikavanhu, Brian, Muthusamy, Selvaraj, Zhu, Dongwei, Xue, Zhaoli, Yu, Qian, Chivumba, Choonzo N, Mack, John, Nyokong, Tebello, Wang, Shengjun, Zhao, Long
- Authors: Musikavanhu, Brian , Muthusamy, Selvaraj , Zhu, Dongwei , Xue, Zhaoli , Yu, Qian , Chivumba, Choonzo N , Mack, John , Nyokong, Tebello , Wang, Shengjun , Zhao, Long
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230362 , vital:49771 , xlink:href="https://doi.org/10.1016/j.saa.2021.120338"
- Description: A new Schiff base probe (QT) consisting of 8-aminoquinoline (Q) and thiophene-2-carboxaldehyde (T) moieties has been synthesized. QT undergoes chelation-enhanced fluorescence quenching when exposed to Hg2+ due to coordination by the sulfur and nitrogen atoms of QT thus forming a facile “turn-off” sensor. The formation of the chelation complex was confirmed by UV–visible absorption and emission spectral measurements, 1H NMR titration and density functional theory calculations. These studies revealed that the probe exhibits high selectivity and sensitivity towards Hg2+ in the presence of other common metal ions. A low detection limit of 23.4 nM was determined and a Job plot confirmed a 2:1 stoichiometry between QT and Hg2+. The potential utility of QT as a sensor for Hg2+ ions in human HeLa cells was determined by confocal fluorescence microscopy, and its suitability for use in the field with environmental samples was tested with Whatman filter paper strips.
- Full Text:
- Date Issued: 2022
- Authors: Musikavanhu, Brian , Muthusamy, Selvaraj , Zhu, Dongwei , Xue, Zhaoli , Yu, Qian , Chivumba, Choonzo N , Mack, John , Nyokong, Tebello , Wang, Shengjun , Zhao, Long
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230362 , vital:49771 , xlink:href="https://doi.org/10.1016/j.saa.2021.120338"
- Description: A new Schiff base probe (QT) consisting of 8-aminoquinoline (Q) and thiophene-2-carboxaldehyde (T) moieties has been synthesized. QT undergoes chelation-enhanced fluorescence quenching when exposed to Hg2+ due to coordination by the sulfur and nitrogen atoms of QT thus forming a facile “turn-off” sensor. The formation of the chelation complex was confirmed by UV–visible absorption and emission spectral measurements, 1H NMR titration and density functional theory calculations. These studies revealed that the probe exhibits high selectivity and sensitivity towards Hg2+ in the presence of other common metal ions. A low detection limit of 23.4 nM was determined and a Job plot confirmed a 2:1 stoichiometry between QT and Hg2+. The potential utility of QT as a sensor for Hg2+ ions in human HeLa cells was determined by confocal fluorescence microscopy, and its suitability for use in the field with environmental samples was tested with Whatman filter paper strips.
- Full Text:
- Date Issued: 2022
A Smaller Circle
- Authors: Bhikha, Nasira
- Date: 2022-04
- Subjects: Creative writing (Higher education) South Africa , South African fiction (English) 21st century , Short stories, South African (English) 21st century , Diaries -- Authorship , Autobiography , Short stories, English History and criticism , American fiction History and criticism , Mexican fiction History and criticism
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232427 , vital:49991
- Description: My thesis is a collection of prose forms weaving my identity as a South African woman of colour, my observations of life through personal, cultural and sociological lenses, where traditions are constantly challenged and evolving. The collection focuses on the untold and unresolved, using fiction as a tool of pushback and psychological reflection. I am motivated by writers who use what I would term reflective expressionism to evoke empathy by tapping into innate, universal emotions. In particular Tiff Holland’s vivid telling of family in the novella Betty Superman where she navigates complex relationships, and bell hooks’ memoirs Bone Black: Memories of Girlhood written as poetic vignettes in fluctuating points of view to draw attention to the intricacies of social structures. Joanna Walsh’s Vertigo has strongly influenced my approach to writing through her compelling imagery and use of motif in fragmented prose that delves into the psyche of her characters. I am also inspired by Lidia Yuknavitch’s visceral use of language, identifying with her invitation: “You deserve to sit at the table. The radiance falls on all of us.” , Thesis (MACW) -- Faculty of Humanities, School of Languages, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Bhikha, Nasira
- Date: 2022-04
- Subjects: Creative writing (Higher education) South Africa , South African fiction (English) 21st century , Short stories, South African (English) 21st century , Diaries -- Authorship , Autobiography , Short stories, English History and criticism , American fiction History and criticism , Mexican fiction History and criticism
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232427 , vital:49991
- Description: My thesis is a collection of prose forms weaving my identity as a South African woman of colour, my observations of life through personal, cultural and sociological lenses, where traditions are constantly challenged and evolving. The collection focuses on the untold and unresolved, using fiction as a tool of pushback and psychological reflection. I am motivated by writers who use what I would term reflective expressionism to evoke empathy by tapping into innate, universal emotions. In particular Tiff Holland’s vivid telling of family in the novella Betty Superman where she navigates complex relationships, and bell hooks’ memoirs Bone Black: Memories of Girlhood written as poetic vignettes in fluctuating points of view to draw attention to the intricacies of social structures. Joanna Walsh’s Vertigo has strongly influenced my approach to writing through her compelling imagery and use of motif in fragmented prose that delves into the psyche of her characters. I am also inspired by Lidia Yuknavitch’s visceral use of language, identifying with her invitation: “You deserve to sit at the table. The radiance falls on all of us.” , Thesis (MACW) -- Faculty of Humanities, School of Languages, 2022
- Full Text:
- Date Issued: 2022-04
A Sn (iv) porphyrin with mitochondria targeting properties for enhanced photodynamic activity against MCF-7 cells
- Babu, Balaji, Mack, John, Nyokong, Tebello
- Authors: Babu, Balaji , Mack, John , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230897 , vital:49829 , xlink:href="https://doi.org/10.1039/D2NJ00350C"
- Description: Two readily synthesized Sn(IV) porphyrins (SnP, SnPH) have been prepared with and without the cationic triphenylphosphonium moiety (TPP+), which have high singlet oxygen quantum yields (ca. 0.72) and long triplet state lifetimes. The Sn(IV) porphyrin with a TPP+ moiety (SnPH) exhibits favorable photodynamic activity against MCF-7 cells with IC50 values of 2.9 μM. SnPH exhibits higher cellular uptake than SnP in MCF-7 cells. A Rhodamine 123 (Rh123) assay showed that SnPH targets mitochondria and induces apoptosis by generating reactive oxygen species. The results demonstrate that this structural modification strategy merits further in-depth study.
- Full Text:
- Date Issued: 2022
- Authors: Babu, Balaji , Mack, John , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230897 , vital:49829 , xlink:href="https://doi.org/10.1039/D2NJ00350C"
- Description: Two readily synthesized Sn(IV) porphyrins (SnP, SnPH) have been prepared with and without the cationic triphenylphosphonium moiety (TPP+), which have high singlet oxygen quantum yields (ca. 0.72) and long triplet state lifetimes. The Sn(IV) porphyrin with a TPP+ moiety (SnPH) exhibits favorable photodynamic activity against MCF-7 cells with IC50 values of 2.9 μM. SnPH exhibits higher cellular uptake than SnP in MCF-7 cells. A Rhodamine 123 (Rh123) assay showed that SnPH targets mitochondria and induces apoptosis by generating reactive oxygen species. The results demonstrate that this structural modification strategy merits further in-depth study.
- Full Text:
- Date Issued: 2022
A social history of midwifery practices in colonial Ibadan, Nigeria, 1893 - 1960
- Olorunnibe, Folaranmi Flourish
- Authors: Olorunnibe, Folaranmi Flourish
- Date: 2022-10-14
- Subjects: Midwifery Nigeria Ibadan , Nigeria History 1900-1960 , Nigeria Politics and government To 1960 , Nigeria Social conditions To 1960 , Maternal health services Nigeria Ibadan , Ibadan (Nigeria) Colonial influence
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/408716 , vital:70519 , DOI 10.21504/10962/408716
- Description: This thesis examines the introduction and development of western medical practices in colonial spaces with particular reference to midwifery practices in colonial Ibadan, Nigeria, from 1893 to 1960. This has become necessary because of the importance placed on childbirth and maternal healthcare in the twentieth century. The trends and changes in midwifery and midwifery practices in colonial Ibadan are seen as reflections of other transformations in British African colonies at large. The study begins with a detailed historical analysis of the major metropolitan and local factors that informed the introduction and development of Western obstetrics in colonial Ibadan, Nigeria. It proceeds to examine the development of Western midwifery practices in colonial Ibadan; highlighting the contributions of the Ibadan people to the development of Western midwifery practices and emphasizing policies affecting development, and implementation of Western obstetrics. The thesis goes further to reveal the prejudiced nature of colonial medical policies, and the ways it shaped various responses especially from rural folks who were particularly marginalized since the 1920s when maternal healthcare policies was implemented in the urban areas till the 1950s when a reformed policy for rural medical service scheme was introduced to the rural folks. Thus, influencing the ways they imagined and appropriated ideas of western obstetrics alongside African traditional midwifery practices. The idea is to demonstrate in this thesis the extent to which the precincts in colonial medical policies, most especially the establishment of maternity hospitals, clinics and dispensaries, and the institutionalization of western obstetrics, inspired critical and ingenious responses from colonial doctors, colonial officials, the missionaries, patients, African trained midwives, traditional medical practitioners and the African population in general. Placing all of these historical events within a wider context, this thesis borrows insights from the social history of medicine in an attempt to reconstruct the colonial medical practices in Ibadan, Nigeria, through the sites of midwifery practices and maternal welfare services from 1893 to 1960. This is in addition to its dependence on a comparatively rich, but skewed historical evidence, including a plethora of annual medical reports, official reports of the department of medical and sanitary services, official correspondences within the colonial government in Ibadan and Nigeria, and between the colonial government and the colonial office in the United Kingdom. Details of African responses to medical policies were garnered from oral testimonies, newspaper publications and correspondences between the African public and the colonial government in Ibadan. In exploring this historical evidence, the thesis reveals very interesting details of colonial perceptions about African health and their underlining motives for introducing western medical ideas, the various medical schemes and policies used in driving colonial interest and the ways Africans imagined, re-imagined, and appropriated Western medical practices. , Thesis (PhD) -- Faculty of Humanities, History, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Olorunnibe, Folaranmi Flourish
- Date: 2022-10-14
- Subjects: Midwifery Nigeria Ibadan , Nigeria History 1900-1960 , Nigeria Politics and government To 1960 , Nigeria Social conditions To 1960 , Maternal health services Nigeria Ibadan , Ibadan (Nigeria) Colonial influence
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/408716 , vital:70519 , DOI 10.21504/10962/408716
- Description: This thesis examines the introduction and development of western medical practices in colonial spaces with particular reference to midwifery practices in colonial Ibadan, Nigeria, from 1893 to 1960. This has become necessary because of the importance placed on childbirth and maternal healthcare in the twentieth century. The trends and changes in midwifery and midwifery practices in colonial Ibadan are seen as reflections of other transformations in British African colonies at large. The study begins with a detailed historical analysis of the major metropolitan and local factors that informed the introduction and development of Western obstetrics in colonial Ibadan, Nigeria. It proceeds to examine the development of Western midwifery practices in colonial Ibadan; highlighting the contributions of the Ibadan people to the development of Western midwifery practices and emphasizing policies affecting development, and implementation of Western obstetrics. The thesis goes further to reveal the prejudiced nature of colonial medical policies, and the ways it shaped various responses especially from rural folks who were particularly marginalized since the 1920s when maternal healthcare policies was implemented in the urban areas till the 1950s when a reformed policy for rural medical service scheme was introduced to the rural folks. Thus, influencing the ways they imagined and appropriated ideas of western obstetrics alongside African traditional midwifery practices. The idea is to demonstrate in this thesis the extent to which the precincts in colonial medical policies, most especially the establishment of maternity hospitals, clinics and dispensaries, and the institutionalization of western obstetrics, inspired critical and ingenious responses from colonial doctors, colonial officials, the missionaries, patients, African trained midwives, traditional medical practitioners and the African population in general. Placing all of these historical events within a wider context, this thesis borrows insights from the social history of medicine in an attempt to reconstruct the colonial medical practices in Ibadan, Nigeria, through the sites of midwifery practices and maternal welfare services from 1893 to 1960. This is in addition to its dependence on a comparatively rich, but skewed historical evidence, including a plethora of annual medical reports, official reports of the department of medical and sanitary services, official correspondences within the colonial government in Ibadan and Nigeria, and between the colonial government and the colonial office in the United Kingdom. Details of African responses to medical policies were garnered from oral testimonies, newspaper publications and correspondences between the African public and the colonial government in Ibadan. In exploring this historical evidence, the thesis reveals very interesting details of colonial perceptions about African health and their underlining motives for introducing western medical ideas, the various medical schemes and policies used in driving colonial interest and the ways Africans imagined, re-imagined, and appropriated Western medical practices. , Thesis (PhD) -- Faculty of Humanities, History, 2022
- Full Text:
- Date Issued: 2022-10-14
A social media analytics framework for decision-making in citizen relationship management
- Authors: Yakobi, Khulekani
- Date: 2022-12
- Subjects: Social Media Analytics -- South Africa , Decision making --Mathematical models , Service delivery
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/60048 , vital:62815
- Description: Globally social media has shown unprecedented levels of adoption and Social Media Analytics (SMA) is a rapidly growing topic. For governments, SMA holds the promise of providing tools and frameworks to collect, monitor, analyse and visualise social media data, usually driven by specific requirements from a target application. However, social media data is noisy and unstructured, and organisations struggle to extract knowledge from this data, and convert it into actual intelligence. This study argues that SMA can support intelligent decision-making for Citizen Relationship Management (CzRM). CzRM is a growing effort of governments around the world to strive to respond rapidly to their citizens by fostering a closer relationship thereby creating more effective and efficient service delivery. However, there is a little evidence in literature on empirical studies of any existing decision-making framework for CzRM and SMA adoption. In particular, there is a gap with regards incorporating SMA into decision-making for CzRM of governments, particularly in developing countries like South Africa. The aim of this study was to develop a framework that provides guidelines, including methods and tools, incorporating SMA into decision-making for CzRM in the Gauteng Provincial Government (GPG) and the Free State Provincial Government (FSPG) of South Africa. A Systematic Literature Review (SLR) and conceptual analysis method was conducted to design the Social Media Analytics Framework for Decision-making in the context of CzRM (the SMAF). The findings from the literature review revealed several benefits and challenges with SMA, in particular the shortage of skills, guidelines, methods and tools for SMA. These challenges were used to draft guidelines that were included in the framework, which consists of five components that can be used to derive intelligent information from SMA. The pragmatic philosophy and a case study design was used to generate an in-depth, multifaceted understanding of the underlying problems in the case of the GPG and the FSPG. The German North-West Metropolitan region was used as a third case study to provide a more global perspective and a case of a developed country in terms of Gross Domestic Product. The scope of the study was limited to social media posts by provincial citizens related to CzRM and service delivery. Both formative and summative evaluations of the proposed theoretical framework were conducted. The formative evaluation was conducted v | Page as an Expert Review to receive feedback of the framework from the experts in the field of Computer Science and Information Systems. The findings validated the framework and some minor improvements were made based on the experts’ recommendations. Focus Group Discussions (FGDs) with participants from government managers and decision makers in the three cases were conducted. Case documents for the three cases were collected and reviewed. All collected data was analysed using the Qualitative Content Analysis (QCA) method and common categories and themes were identified. Summative evaluations were conducted in the form of a Field Study, which consisted of an analysis of Twitter data from the three cases, and a closing FGD with Business Intelligence (BI) experts at the primary case of the e-Government department of the GPG. The findings revealed that SMA has been adopted in all three cases; however, while their strategies are comprehensive their implementations are very much in their early stages. The findings also highlighted the status of SMA in government and some potential gaps and areas for implementing the framework. , Thesis (PhD) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2022
- Full Text:
- Date Issued: 2022-12
- Authors: Yakobi, Khulekani
- Date: 2022-12
- Subjects: Social Media Analytics -- South Africa , Decision making --Mathematical models , Service delivery
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/60048 , vital:62815
- Description: Globally social media has shown unprecedented levels of adoption and Social Media Analytics (SMA) is a rapidly growing topic. For governments, SMA holds the promise of providing tools and frameworks to collect, monitor, analyse and visualise social media data, usually driven by specific requirements from a target application. However, social media data is noisy and unstructured, and organisations struggle to extract knowledge from this data, and convert it into actual intelligence. This study argues that SMA can support intelligent decision-making for Citizen Relationship Management (CzRM). CzRM is a growing effort of governments around the world to strive to respond rapidly to their citizens by fostering a closer relationship thereby creating more effective and efficient service delivery. However, there is a little evidence in literature on empirical studies of any existing decision-making framework for CzRM and SMA adoption. In particular, there is a gap with regards incorporating SMA into decision-making for CzRM of governments, particularly in developing countries like South Africa. The aim of this study was to develop a framework that provides guidelines, including methods and tools, incorporating SMA into decision-making for CzRM in the Gauteng Provincial Government (GPG) and the Free State Provincial Government (FSPG) of South Africa. A Systematic Literature Review (SLR) and conceptual analysis method was conducted to design the Social Media Analytics Framework for Decision-making in the context of CzRM (the SMAF). The findings from the literature review revealed several benefits and challenges with SMA, in particular the shortage of skills, guidelines, methods and tools for SMA. These challenges were used to draft guidelines that were included in the framework, which consists of five components that can be used to derive intelligent information from SMA. The pragmatic philosophy and a case study design was used to generate an in-depth, multifaceted understanding of the underlying problems in the case of the GPG and the FSPG. The German North-West Metropolitan region was used as a third case study to provide a more global perspective and a case of a developed country in terms of Gross Domestic Product. The scope of the study was limited to social media posts by provincial citizens related to CzRM and service delivery. Both formative and summative evaluations of the proposed theoretical framework were conducted. The formative evaluation was conducted v | Page as an Expert Review to receive feedback of the framework from the experts in the field of Computer Science and Information Systems. The findings validated the framework and some minor improvements were made based on the experts’ recommendations. Focus Group Discussions (FGDs) with participants from government managers and decision makers in the three cases were conducted. Case documents for the three cases were collected and reviewed. All collected data was analysed using the Qualitative Content Analysis (QCA) method and common categories and themes were identified. Summative evaluations were conducted in the form of a Field Study, which consisted of an analysis of Twitter data from the three cases, and a closing FGD with Business Intelligence (BI) experts at the primary case of the e-Government department of the GPG. The findings revealed that SMA has been adopted in all three cases; however, while their strategies are comprehensive their implementations are very much in their early stages. The findings also highlighted the status of SMA in government and some potential gaps and areas for implementing the framework. , Thesis (PhD) -- Faculty of Science, School of Computer Science, Mathematics, Physics and Statistics, 2022
- Full Text:
- Date Issued: 2022-12
A social networking approach to security awareness in end-user cyber-driven financial transactions
- Authors: Maharaj,Rahul
- Date: 2019-04
- Subjects: Internet -- Security measures , Cyber intelligence (Computer security) , Internet -- Social aspects , Cyberspace
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/49952 , vital:41912
- Description: Cyberspace, including the internet and associated technologies have become critical to social users in their day to day lives. Social users have grown to become reliant on cyberspace and associated cyber services. As such, a culture of users becoming dependent on cyberspace has formed. This cyberculture need to ensure that they can make use of cyberspace and associated cyber services in a safe and secure manner. This is particularly true for those social users involved in cyberdriven financial transactions. Therefore, the aim of this research study is to report on research undertaken, to assist said users by providing them with an alternative educational approach to cyber security, education, awareness and training. , Thesis (MIT) -- Faculty of Engineering, the Built Environment and Technology, Information Technology, 2019
- Full Text:
- Date Issued: 2019-04
- Authors: Maharaj,Rahul
- Date: 2019-04
- Subjects: Internet -- Security measures , Cyber intelligence (Computer security) , Internet -- Social aspects , Cyberspace
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/49952 , vital:41912
- Description: Cyberspace, including the internet and associated technologies have become critical to social users in their day to day lives. Social users have grown to become reliant on cyberspace and associated cyber services. As such, a culture of users becoming dependent on cyberspace has formed. This cyberculture need to ensure that they can make use of cyberspace and associated cyber services in a safe and secure manner. This is particularly true for those social users involved in cyberdriven financial transactions. Therefore, the aim of this research study is to report on research undertaken, to assist said users by providing them with an alternative educational approach to cyber security, education, awareness and training. , Thesis (MIT) -- Faculty of Engineering, the Built Environment and Technology, Information Technology, 2019
- Full Text:
- Date Issued: 2019-04
A social realist study of employability development in engineering education
- Authors: Nudelman, Gabrielle Reeve
- Date: 2018
- Subjects: Critical realism , Electrical engineering -- Study and teaching (Higher) -- South Africa -- Cape Town , Employability , Career education -- South Africa -- Cape Town , School-to-work transition -- South Africa -- Cape Town
- Language: English
- Type: thesis , text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/62884 , vital:28307
- Description: This qualitative case study of a course pairing offered to final-year electrical engineering students at the University of Cape Town in 2015 was undertaken in order to better understand the ways in which participation in undergraduate courses can prepare engineering students for the workplace. The course pairing consisted of New Venture Planning and Professional Communication Studies. While the former aimed to expose students to the knowledge relating to starting a new business, the latter focused on teaching students how to create written and oral texts to support such an endeavour. Using Roy Bhaskar’s critical realism as a theoretical underlabourer, the study develops understandings regarding the generative mechanisms at work during the two courses. In support of this, the study posits an understanding of employability that moves beyond the acquisition of discrete workplace skills. Rather, employability is conceptualised as discursive transformation, with students being deemed “work-ready” when they develop discursive identities as engineers. Data generation took place by means of focus group and individual interviews, ethnographic observation and documentary research. Margaret Archer’s social realist tools – in particular, analytical dualism and the morphogenetic framework were used to trace the students’ transformations over the course pairing. It was argued that those students who developed discursive identities of engineers were those who, in Archer’s terms, emerged as social actors at the end of the course pairing. Two characteristics of the courses were found to enable this transformation: those parts that promoted deepened understanding of what the role of “engineer” entailed and the parts that provided spaces for students to develop their own personal identities. The findings of the study indicated that discursive identities as engineers were more likely to be developed through the group work and spaces for reflection engendered by the courses than as a result of the formal curriculum. The implications of the research are that, while a focus on employability in engineering education is valid and productive, this needs to be supported by opportunities for authentic learning experiences which afford students the opportunity to engage in learning that promotes real-life application of knowledge. , Thesis (PhD)--Rhodes University, Faculty of Education, Education, 2018
- Full Text:
- Date Issued: 2018
- Authors: Nudelman, Gabrielle Reeve
- Date: 2018
- Subjects: Critical realism , Electrical engineering -- Study and teaching (Higher) -- South Africa -- Cape Town , Employability , Career education -- South Africa -- Cape Town , School-to-work transition -- South Africa -- Cape Town
- Language: English
- Type: thesis , text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/62884 , vital:28307
- Description: This qualitative case study of a course pairing offered to final-year electrical engineering students at the University of Cape Town in 2015 was undertaken in order to better understand the ways in which participation in undergraduate courses can prepare engineering students for the workplace. The course pairing consisted of New Venture Planning and Professional Communication Studies. While the former aimed to expose students to the knowledge relating to starting a new business, the latter focused on teaching students how to create written and oral texts to support such an endeavour. Using Roy Bhaskar’s critical realism as a theoretical underlabourer, the study develops understandings regarding the generative mechanisms at work during the two courses. In support of this, the study posits an understanding of employability that moves beyond the acquisition of discrete workplace skills. Rather, employability is conceptualised as discursive transformation, with students being deemed “work-ready” when they develop discursive identities as engineers. Data generation took place by means of focus group and individual interviews, ethnographic observation and documentary research. Margaret Archer’s social realist tools – in particular, analytical dualism and the morphogenetic framework were used to trace the students’ transformations over the course pairing. It was argued that those students who developed discursive identities of engineers were those who, in Archer’s terms, emerged as social actors at the end of the course pairing. Two characteristics of the courses were found to enable this transformation: those parts that promoted deepened understanding of what the role of “engineer” entailed and the parts that provided spaces for students to develop their own personal identities. The findings of the study indicated that discursive identities as engineers were more likely to be developed through the group work and spaces for reflection engendered by the courses than as a result of the formal curriculum. The implications of the research are that, while a focus on employability in engineering education is valid and productive, this needs to be supported by opportunities for authentic learning experiences which afford students the opportunity to engage in learning that promotes real-life application of knowledge. , Thesis (PhD)--Rhodes University, Faculty of Education, Education, 2018
- Full Text:
- Date Issued: 2018
A sociological analysis of the experiences of Zimbabwean teachers in South Africa: the case of KwaZulu-Natal townships and township secondary schools
- Authors: Daki, Andile Lebohang
- Date: 2022-10-14
- Subjects: Xenophobia South Africa KwaZulu-Natal , Teachers, Foreign South Africa KwaZulu-Natal , Zimbabweans South Africa KwaZulu-Natal , Teachers, Foreign Social conditions , Marginality, Social , Culture conflict South Africa KwaZulu-Natal
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365953 , vital:65805 , DOI https://doi.org/10.21504/10962/365953
- Description: This thesis seeks to understand the social and cultural experiences of Zimbabwean teachers, as foreigners, in KwaZulu-Natal townships, and KwaZulu-Natal township secondary schools, in South Africa. It examines the ways in which Zimbabwean teachers negotiate the social, cultural, and institutional milieu of KwaZulu-Natal townships and secondary schools. In doing so, the thesis draws upon social interface theory, as this theory facilitates an examination and understanding of the ways in which the Zimbabwean teachers interpret the spaces (and lifeworld) of South Africans and, simultaneously, navigate their way in and through these spaces along social and cultural interfaces. While the focus is on the perspectives and practices of the Zimbabwean teachers, the thesis recognises and shows that their socio-cultural experiences are constituted and configured in significant ways by their daily encounters with South Africans. The fieldwork for the thesis involved primarily in-depth interviews with thirty Zimbabwean teachers residing in six selected KwaZulu-Natal townships (and teaching at six different secondary schools), as well as fifteen South African teachers, five school administrators and thirty other South African citizens. The sample of Zimbabwean teachers was stratified in relation to the different townships, as well as gender and the number of years teaching in South Africa, so as to investigate whether and how these variables may configure the socio-cultural experiences of these teachers. A consideration of variation in the number of years of teaching in South Africa in particular allowed for an examination of possible shifts in socio-cultural experiences over time, as negotiation along interfaces is an ongoing and contingent process. The findings demonstrate a range of experiences and challenges faced by Zimbabwean teachers in KwaZulu-Natal (with regard to both township and school life), some of which they share with South African teachers but many of which are unique to them. At the same time, there are important differences amongst Zimbabwean teachers in relation to how they interface with South African citizens and teachers. While some teachers negotiate local spaces through active socialising and assimilating into the lifeworld (township life of South Africans and the institutional culture of township schools), other teachers move through the space by way of isolation, withdrawal, and alienation. In general, in terms of adjusting to the lifeworld of South Africans in KwaZulu-Natal townships and schools, Zimbabwean teachers pursue different routes which, in the end, made sense to them and about which they express some degree of personal comfort. , Lo mbhalo wobuhlakani uzama ukuqonda inhlalo kanye namasiko abahlangabezana nako othisha baseZimbabwe njengabantu bokufika emalokishini akwaZulu-Natal, kanye nasezikoleni zamabanga athe thuthu zasemalokishini akwaZulu-Natal eNingizimu-Afrika. Uhlolisisa izindlela labo thisha ababonisana ngazo ngamasiko kanye nenhlalakahle yasezikoleni zasemalokishini akwaZulu-Natal. Ngokwenzanjalo, lo mbhalo udonsa umhlahlandlela wenhlalakahle nokuhlangana ngoba ukungena kwabo endaweni yakwaZulu-Natal, labo thisha bahumusha indawo baphinde babonisane bachushisane ngenqubekela phambili yabo nangenhlalo namasiko abahlangabezana nawo. Ukuhlanganisa othisha baseNingizimu-Afrika nezakhamuzi kumele kusebenzisane ngokulingana. Abahlangabezana nakho kwakhiwa ngokubambisana phakathi kwabaseZimbabwe kanye nabaseNingizimu-Afrika ukuze izwi labaseNingizimu-Afrika lingagqibeki ngoba sekunakekelwa kakhulu abseZimbabwe. Umsebenzi wasensimini walo mbhalo wobuhlakani uhlanganisa ucwaningo kothisha abangani-30 baseZimbabwe abahlala ezindaweni ezingu-6 ezikhethekile ezisemalokishini akwaZulu-Natal, nothisha abayi-15 baseNingizimu-Afrika kanye nabaphathi bezikole abayi-5. Kubuye kwenziwa ucwaningo kwizakhamuzi ezingama-30 zaseNingizimu-Afrika. Isampula lihlanganiswe ngokubuka indawo lapho aphuma khona umuntu, kanye neminyaka aseyifundisile eNingizimu-Afrika. Ucwaningo lubukisise kakhulu indlela ababuka ngayo inhlalakahle namasiko kube kubukisiswa nenani leminyaka aseyifundisile umuntu ngamunye ukuze kuhlolisiswe izinguquko zokuxoxisana ezidalwe yisikhathi asihlalile umuntu phakathi kothisha abasebancane nalabo asebekhulile. Imiphumela yocwaningo iveza iznselele ezahlukene ababhekene nazo othisha baseZimbabwe njengoba bengabahlali baseNingizimu-Afrika. Ezinye zalezi nselele ziqhamuka ngokwehlukana kwemiphakathi kwabaseZimbabwe kanye nabaseNingizimu-Afrika. Ngokunjalo kunomehluko obalulekayo kothisha baseZimbabwe mayelana nendlela ukuxoxisana nokubonisana okuqhubeka ngayo. Kukhona labo ukungena bathi khaxa emiphakathini nasezimpilweni abakuzo eNingizimu-Afrika nasezikoleni abakuzo namasiko nenhlalakahle yakulezo zindawo ngakolunye uhlangothi abanye othisha bazithole bephila njengenhlwa bephila ngabodwana eNingizimu-Afrika. Kodwa ekugcineni kwakho konke, lolu cwaningo luthola ukuthi othisha baseZimbabwe ezikoleni zasemalokishini akwaZulu-Natal lapha eNingizimu-Afrika bazakhela impilo eyenza umuntu ngamunye azizwe ehlaliseke kahle eNingizimu- Afrika ngendlela ephelele nethokomalisa yena ngo kwakhe. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Daki, Andile Lebohang
- Date: 2022-10-14
- Subjects: Xenophobia South Africa KwaZulu-Natal , Teachers, Foreign South Africa KwaZulu-Natal , Zimbabweans South Africa KwaZulu-Natal , Teachers, Foreign Social conditions , Marginality, Social , Culture conflict South Africa KwaZulu-Natal
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365953 , vital:65805 , DOI https://doi.org/10.21504/10962/365953
- Description: This thesis seeks to understand the social and cultural experiences of Zimbabwean teachers, as foreigners, in KwaZulu-Natal townships, and KwaZulu-Natal township secondary schools, in South Africa. It examines the ways in which Zimbabwean teachers negotiate the social, cultural, and institutional milieu of KwaZulu-Natal townships and secondary schools. In doing so, the thesis draws upon social interface theory, as this theory facilitates an examination and understanding of the ways in which the Zimbabwean teachers interpret the spaces (and lifeworld) of South Africans and, simultaneously, navigate their way in and through these spaces along social and cultural interfaces. While the focus is on the perspectives and practices of the Zimbabwean teachers, the thesis recognises and shows that their socio-cultural experiences are constituted and configured in significant ways by their daily encounters with South Africans. The fieldwork for the thesis involved primarily in-depth interviews with thirty Zimbabwean teachers residing in six selected KwaZulu-Natal townships (and teaching at six different secondary schools), as well as fifteen South African teachers, five school administrators and thirty other South African citizens. The sample of Zimbabwean teachers was stratified in relation to the different townships, as well as gender and the number of years teaching in South Africa, so as to investigate whether and how these variables may configure the socio-cultural experiences of these teachers. A consideration of variation in the number of years of teaching in South Africa in particular allowed for an examination of possible shifts in socio-cultural experiences over time, as negotiation along interfaces is an ongoing and contingent process. The findings demonstrate a range of experiences and challenges faced by Zimbabwean teachers in KwaZulu-Natal (with regard to both township and school life), some of which they share with South African teachers but many of which are unique to them. At the same time, there are important differences amongst Zimbabwean teachers in relation to how they interface with South African citizens and teachers. While some teachers negotiate local spaces through active socialising and assimilating into the lifeworld (township life of South Africans and the institutional culture of township schools), other teachers move through the space by way of isolation, withdrawal, and alienation. In general, in terms of adjusting to the lifeworld of South Africans in KwaZulu-Natal townships and schools, Zimbabwean teachers pursue different routes which, in the end, made sense to them and about which they express some degree of personal comfort. , Lo mbhalo wobuhlakani uzama ukuqonda inhlalo kanye namasiko abahlangabezana nako othisha baseZimbabwe njengabantu bokufika emalokishini akwaZulu-Natal, kanye nasezikoleni zamabanga athe thuthu zasemalokishini akwaZulu-Natal eNingizimu-Afrika. Uhlolisisa izindlela labo thisha ababonisana ngazo ngamasiko kanye nenhlalakahle yasezikoleni zasemalokishini akwaZulu-Natal. Ngokwenzanjalo, lo mbhalo udonsa umhlahlandlela wenhlalakahle nokuhlangana ngoba ukungena kwabo endaweni yakwaZulu-Natal, labo thisha bahumusha indawo baphinde babonisane bachushisane ngenqubekela phambili yabo nangenhlalo namasiko abahlangabezana nawo. Ukuhlanganisa othisha baseNingizimu-Afrika nezakhamuzi kumele kusebenzisane ngokulingana. Abahlangabezana nakho kwakhiwa ngokubambisana phakathi kwabaseZimbabwe kanye nabaseNingizimu-Afrika ukuze izwi labaseNingizimu-Afrika lingagqibeki ngoba sekunakekelwa kakhulu abseZimbabwe. Umsebenzi wasensimini walo mbhalo wobuhlakani uhlanganisa ucwaningo kothisha abangani-30 baseZimbabwe abahlala ezindaweni ezingu-6 ezikhethekile ezisemalokishini akwaZulu-Natal, nothisha abayi-15 baseNingizimu-Afrika kanye nabaphathi bezikole abayi-5. Kubuye kwenziwa ucwaningo kwizakhamuzi ezingama-30 zaseNingizimu-Afrika. Isampula lihlanganiswe ngokubuka indawo lapho aphuma khona umuntu, kanye neminyaka aseyifundisile eNingizimu-Afrika. Ucwaningo lubukisise kakhulu indlela ababuka ngayo inhlalakahle namasiko kube kubukisiswa nenani leminyaka aseyifundisile umuntu ngamunye ukuze kuhlolisiswe izinguquko zokuxoxisana ezidalwe yisikhathi asihlalile umuntu phakathi kothisha abasebancane nalabo asebekhulile. Imiphumela yocwaningo iveza iznselele ezahlukene ababhekene nazo othisha baseZimbabwe njengoba bengabahlali baseNingizimu-Afrika. Ezinye zalezi nselele ziqhamuka ngokwehlukana kwemiphakathi kwabaseZimbabwe kanye nabaseNingizimu-Afrika. Ngokunjalo kunomehluko obalulekayo kothisha baseZimbabwe mayelana nendlela ukuxoxisana nokubonisana okuqhubeka ngayo. Kukhona labo ukungena bathi khaxa emiphakathini nasezimpilweni abakuzo eNingizimu-Afrika nasezikoleni abakuzo namasiko nenhlalakahle yakulezo zindawo ngakolunye uhlangothi abanye othisha bazithole bephila njengenhlwa bephila ngabodwana eNingizimu-Afrika. Kodwa ekugcineni kwakho konke, lolu cwaningo luthola ukuthi othisha baseZimbabwe ezikoleni zasemalokishini akwaZulu-Natal lapha eNingizimu-Afrika bazakhela impilo eyenza umuntu ngamunye azizwe ehlaliseke kahle eNingizimu- Afrika ngendlela ephelele nethokomalisa yena ngo kwakhe. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
A sociological exploration of whether culture inhibits comprehensive sexual education in schools: the case of urban schools in Mpika district of Zambia
- Authors: Nyoni, Kaliza
- Date: 2022-10-14
- Subjects: Sex instruction Zambia , Sex instruction Social aspects Zambia , Culture , High school students Attitudes , Sex educators Attitudes , Influence (Psychology) , Language and culture Zambia
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406796 , vital:70308
- Description: This study investigated the impact and influence of culture in the provisioning of comprehensive sexuality education , the case of urban schools of Mpika district of Zambia. The specific objectives were to investigate the frameworks that inform the teaching of CSE in schools, explore ways in which influence of culture on the framework affects the leaners participation in learning CSE, explore the influence of cultural norms, metaphors, and values on that framework, explore whether cultural norms have an impact and influence on teachers and explore whether there is a discrepancy between cultural values and CSE. The methodology which was used in carrying out the research was descriptive research design and purposive sampling was used in which a sample of 21 respondents who are leaners were picked and 5 teachers who teach CSE were chosen. The interview schedule was used to collect data from the sample which was drawn. The data gathered was analysed using concepts and themes as well as observer impression. The findings of this research are that there is a framework that informs the teaching of CSE in schools whose aim is to curb school drop outs by reducing teen pregnancies and high infection rates of STIs and HIV/AIDS. The framework seeks to empower knowledge on the adolescents in relation to gender norms, rights in relationships and sexuality. The major findings of the research are that culture has an influence on the teachers and leaners. Of particular discovery is the use of symbols through charts which display human private parts. This is construed by the teachers and learners to be against their cultural beliefs. Furthermore, language that this subject uses is culturally seen to be too strong and vulgar , to both teachers and leaners. This study found out that open discussion in class of the topic on sexuality does not sit well with the leaners as it is against their cultural orientation. The research also found out that there are lessons in CSE that are beneficial to the learners such as , how to prevent contracting of STIs and HIV/AIDS and prevention of unwanted pregnancies. , Thesis (MA) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
- Authors: Nyoni, Kaliza
- Date: 2022-10-14
- Subjects: Sex instruction Zambia , Sex instruction Social aspects Zambia , Culture , High school students Attitudes , Sex educators Attitudes , Influence (Psychology) , Language and culture Zambia
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406796 , vital:70308
- Description: This study investigated the impact and influence of culture in the provisioning of comprehensive sexuality education , the case of urban schools of Mpika district of Zambia. The specific objectives were to investigate the frameworks that inform the teaching of CSE in schools, explore ways in which influence of culture on the framework affects the leaners participation in learning CSE, explore the influence of cultural norms, metaphors, and values on that framework, explore whether cultural norms have an impact and influence on teachers and explore whether there is a discrepancy between cultural values and CSE. The methodology which was used in carrying out the research was descriptive research design and purposive sampling was used in which a sample of 21 respondents who are leaners were picked and 5 teachers who teach CSE were chosen. The interview schedule was used to collect data from the sample which was drawn. The data gathered was analysed using concepts and themes as well as observer impression. The findings of this research are that there is a framework that informs the teaching of CSE in schools whose aim is to curb school drop outs by reducing teen pregnancies and high infection rates of STIs and HIV/AIDS. The framework seeks to empower knowledge on the adolescents in relation to gender norms, rights in relationships and sexuality. The major findings of the research are that culture has an influence on the teachers and leaners. Of particular discovery is the use of symbols through charts which display human private parts. This is construed by the teachers and learners to be against their cultural beliefs. Furthermore, language that this subject uses is culturally seen to be too strong and vulgar , to both teachers and leaners. This study found out that open discussion in class of the topic on sexuality does not sit well with the leaners as it is against their cultural orientation. The research also found out that there are lessons in CSE that are beneficial to the learners such as , how to prevent contracting of STIs and HIV/AIDS and prevention of unwanted pregnancies. , Thesis (MA) -- Faculty of Humanities, Sociology, 2022
- Full Text:
- Date Issued: 2022-10-14
A sociological investigation of child labour in the fishing communities of Kalangala, Uganda
- Majanja, Zaaly’embikke Irene Margaret
- Authors: Majanja, Zaaly’embikke Irene Margaret
- Date: 2021-04
- Subjects: Child labor -- Uganda -- Sociological aspects
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53428 , vital:45153
- Description: The researcher conducted a sociological investigation into the persistence of child labour in the fishing communities of Uganda, specifically in the Ssese Islands, Kalangala District, on the Kisaba and Nakibanga landing sites situate in Bukasa. The study aimed at investigating the sociological aspects of persistent child labour practices in the fishing communities. The study employed a qualitative research method with a descriptive case study design, utilising an interpretive paradigm. The case study design facilitated the researcher’s investigation into child labour practices in their natural settings. The study employed mainly in-depth interviews, focus group discussions and observations for data collection. Data analysis was performed utilising the ATLAS.ti computer software package to identify the sociological factors involved with employing child labour. The Various themes emerged from the data analysis. The study established that despite the Ugandan Government domesticating all the UN/ILO Conventions on Rights of a Child and Worst Forms of Child Labour, the OAU Charter on Child Rights and Welfare and also instituting legal frameworks at national level, the practice of using child labour persists. The findings disclosed that economic, sociological and structural factors appear to perpetuate child labour in the fishing communities. Economic factors such as poverty, unemployment or underemployment, then sociological aspects such as men abandoning their helpless families on landing sites as they follow the fish according to seasons. Furthermore, the community attitudes such as low value for education, child labour being a normal trend and part of apprenticeship for the children. Again, there are structural issues such as the inadequate implementation and the weak enforcement of the legal frameworks, including insufficient infrastructures such as schooling facilities. These factors appear to perpetuate child labour in the fishing communities. The study concluded that there is an urgent need to address the issues associated with the persistence of child labour in the fishing communities. The study recommends employing a holistic multipronged approach through bottom-up participatory planning and integrating stakeholders at various levels. This could enhance efforts and share ideas and resources that can result in effective operations in order to eliminate child labour in the fishing communities. , Thesis (DPhil) -- Faculty of Humanities, 2021
- Full Text:
- Date Issued: 2021-04
- Authors: Majanja, Zaaly’embikke Irene Margaret
- Date: 2021-04
- Subjects: Child labor -- Uganda -- Sociological aspects
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53428 , vital:45153
- Description: The researcher conducted a sociological investigation into the persistence of child labour in the fishing communities of Uganda, specifically in the Ssese Islands, Kalangala District, on the Kisaba and Nakibanga landing sites situate in Bukasa. The study aimed at investigating the sociological aspects of persistent child labour practices in the fishing communities. The study employed a qualitative research method with a descriptive case study design, utilising an interpretive paradigm. The case study design facilitated the researcher’s investigation into child labour practices in their natural settings. The study employed mainly in-depth interviews, focus group discussions and observations for data collection. Data analysis was performed utilising the ATLAS.ti computer software package to identify the sociological factors involved with employing child labour. The Various themes emerged from the data analysis. The study established that despite the Ugandan Government domesticating all the UN/ILO Conventions on Rights of a Child and Worst Forms of Child Labour, the OAU Charter on Child Rights and Welfare and also instituting legal frameworks at national level, the practice of using child labour persists. The findings disclosed that economic, sociological and structural factors appear to perpetuate child labour in the fishing communities. Economic factors such as poverty, unemployment or underemployment, then sociological aspects such as men abandoning their helpless families on landing sites as they follow the fish according to seasons. Furthermore, the community attitudes such as low value for education, child labour being a normal trend and part of apprenticeship for the children. Again, there are structural issues such as the inadequate implementation and the weak enforcement of the legal frameworks, including insufficient infrastructures such as schooling facilities. These factors appear to perpetuate child labour in the fishing communities. The study concluded that there is an urgent need to address the issues associated with the persistence of child labour in the fishing communities. The study recommends employing a holistic multipronged approach through bottom-up participatory planning and integrating stakeholders at various levels. This could enhance efforts and share ideas and resources that can result in effective operations in order to eliminate child labour in the fishing communities. , Thesis (DPhil) -- Faculty of Humanities, 2021
- Full Text:
- Date Issued: 2021-04
A sociological study of menstrual hygiene management in schools in the Makana District, Eastern Cape, South Africa
- Authors: Bloem, Sharon Gretchen
- Date: 2021-10-29
- Subjects: Schoolgirls Health and hygiene South Africa Makhanda , Menstruation Social aspects South Africa Makhanda , Health behavior in adolescence South Africa Makhanda , Teenage girls Health and hygiene South Africa Makhanda , Teenage girls Physiology South Africa Makhanda , Life skills South Africa Makhanda
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/189974 , vital:44952
- Description: Appropriate menstrual hygiene management is affected by taboos and secrecy surrounding menstruation. Inadequate information and knowledge about menstruation and lack of resources for managing menstruation hygienically have impacted adolescent girls on a psychosocial and physical level. Consequently, the dignity of schoolgirls during the onset of menstruation through puberty and adolescent phases is jeopardised. It is therefore imperative to understand the normal physiological changes that school-going children from Grades 6 to 12 undergo and acknowledge how these changes affect their education within the school environment. In the Makana district, Eastern Cape, South Africa, the topic of menstrual hygiene management is under-researched at schools and, therefore, this research explores school educators’ perceptions of menstrual hygiene management at primary, secondary and private schools in this area. Schools have a responsibility to create a safe environment for learners’ education, which includes the topic of menstruation without discriminating against or labelling menstruating girls. This research found that the topic of menstruation is only discussed in Life Science and Life Orientation subjects and only covers the physiological changes of the body. These subjects, however, exclude the topic of menstrual hygiene management. This study found that several schools in the Makana district are not adequately equipped to provide for the needs of menstruating girls and therefore educators need to be prepared to deal with menstruation in the school context. The educators are also required to go for regular training or workshops to equip them to manage menstruation in a school environment. The infrastructure of a school includes water and sanitation which are components of menstrual hygiene management. The infrastructure at the participating public schools was inadequate and therefore impacted on the menstrual hygiene management for the girls. The unavailability of water, the non-existence of a sick room and lack of a waste disposal system at some public schools presented further challenges for menstrual hygiene management. A qualitative research method was applied in this study and a symbolic interactionism approach was used. , Thesis (MA) -- Faculty of Humanities, Sociology, 2021
- Full Text:
- Date Issued: 2021-10-29
- Authors: Bloem, Sharon Gretchen
- Date: 2021-10-29
- Subjects: Schoolgirls Health and hygiene South Africa Makhanda , Menstruation Social aspects South Africa Makhanda , Health behavior in adolescence South Africa Makhanda , Teenage girls Health and hygiene South Africa Makhanda , Teenage girls Physiology South Africa Makhanda , Life skills South Africa Makhanda
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/189974 , vital:44952
- Description: Appropriate menstrual hygiene management is affected by taboos and secrecy surrounding menstruation. Inadequate information and knowledge about menstruation and lack of resources for managing menstruation hygienically have impacted adolescent girls on a psychosocial and physical level. Consequently, the dignity of schoolgirls during the onset of menstruation through puberty and adolescent phases is jeopardised. It is therefore imperative to understand the normal physiological changes that school-going children from Grades 6 to 12 undergo and acknowledge how these changes affect their education within the school environment. In the Makana district, Eastern Cape, South Africa, the topic of menstrual hygiene management is under-researched at schools and, therefore, this research explores school educators’ perceptions of menstrual hygiene management at primary, secondary and private schools in this area. Schools have a responsibility to create a safe environment for learners’ education, which includes the topic of menstruation without discriminating against or labelling menstruating girls. This research found that the topic of menstruation is only discussed in Life Science and Life Orientation subjects and only covers the physiological changes of the body. These subjects, however, exclude the topic of menstrual hygiene management. This study found that several schools in the Makana district are not adequately equipped to provide for the needs of menstruating girls and therefore educators need to be prepared to deal with menstruation in the school context. The educators are also required to go for regular training or workshops to equip them to manage menstruation in a school environment. The infrastructure of a school includes water and sanitation which are components of menstrual hygiene management. The infrastructure at the participating public schools was inadequate and therefore impacted on the menstrual hygiene management for the girls. The unavailability of water, the non-existence of a sick room and lack of a waste disposal system at some public schools presented further challenges for menstrual hygiene management. A qualitative research method was applied in this study and a symbolic interactionism approach was used. , Thesis (MA) -- Faculty of Humanities, Sociology, 2021
- Full Text:
- Date Issued: 2021-10-29
A spatial assessment of riparian vegetation density and implications for streambank erosion in relation to land tenure in the Mgwalana Catchment, Eastern Cape Province, South Africa
- Authors: Maxama, Asakhile
- Date: 2021-12
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/53864 , vital:46026
- Description: Riparian vegetation provides an array of various ecosystem functions and has significantly shaped the conditions of catchments. It has strong controls on fluvial geomorphology and erosion processes. The Mgwalana catchment has been intensively studied over the years and the current environmental condition of the study has been linked to land use history. The catchment has been subjected to land use/cover changes (LUCC) over the years. However, spatial variations in riparian vegetation, their implications for stream bank stability and the contribution of land tenure systems to stream channel degradation are poorly understood. The study sought to assess the implications of the spatial variations in riparian vegetation density for stream bank erosion in relation to land tenure on a catchment scale. Land tenure units comprising the catchment of study are traditional and betterment villages (communal lands), and former white commercial farms. A three-pronged approach using GIS and remote sensing, field investigations and laboratory procedures for soil analysis was employed in this study. Variations of riparian vegetation density in the catchment were mapped using ArcGIS for the two land tenure units to assess the spatial variations of riparian density along stream reaches and to determine the spatial relationship between land tenure units and riparian vegetation diminution. Other mapped shape files include sediment accumulation zones to analyse the spatial relationship between riparian vegetation density and sediment sinks. LUCC classification and analysis of the Normalized Difference Vegetation Index (NDVI) were carried out in IDRISI Selva, using Landsat 8 TM imagery of 2018 to represent the current spatial riparian vegetation variations in the catchment. Field investigations were conducted to determine the coupling among hillslope gully erosion, riparian vegetation density and sink areas; and to assess physical characteristics of soil. This would permit an assessment of the implications of riparian vegetation for stream bank erosion and sediment accumulation within the tenure units. Soil samples were taken from scantily and densely vegetated stream reaches, as well as measurements of channel widths and depths. Analyses of soil physical properties viz; grain size distribution, bulk density, soil texture and aggregate stability were done. Results demonstrated that a sparse riparian vegetation distribution was consistent with the communal villages, confined to the upper catchment area. Dense riparian vegetation distribution was consistent with former commercial farms in the lower catchment area. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2021
- Full Text:
- Date Issued: 2021-12
- Authors: Maxama, Asakhile
- Date: 2021-12
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/53864 , vital:46026
- Description: Riparian vegetation provides an array of various ecosystem functions and has significantly shaped the conditions of catchments. It has strong controls on fluvial geomorphology and erosion processes. The Mgwalana catchment has been intensively studied over the years and the current environmental condition of the study has been linked to land use history. The catchment has been subjected to land use/cover changes (LUCC) over the years. However, spatial variations in riparian vegetation, their implications for stream bank stability and the contribution of land tenure systems to stream channel degradation are poorly understood. The study sought to assess the implications of the spatial variations in riparian vegetation density for stream bank erosion in relation to land tenure on a catchment scale. Land tenure units comprising the catchment of study are traditional and betterment villages (communal lands), and former white commercial farms. A three-pronged approach using GIS and remote sensing, field investigations and laboratory procedures for soil analysis was employed in this study. Variations of riparian vegetation density in the catchment were mapped using ArcGIS for the two land tenure units to assess the spatial variations of riparian density along stream reaches and to determine the spatial relationship between land tenure units and riparian vegetation diminution. Other mapped shape files include sediment accumulation zones to analyse the spatial relationship between riparian vegetation density and sediment sinks. LUCC classification and analysis of the Normalized Difference Vegetation Index (NDVI) were carried out in IDRISI Selva, using Landsat 8 TM imagery of 2018 to represent the current spatial riparian vegetation variations in the catchment. Field investigations were conducted to determine the coupling among hillslope gully erosion, riparian vegetation density and sink areas; and to assess physical characteristics of soil. This would permit an assessment of the implications of riparian vegetation for stream bank erosion and sediment accumulation within the tenure units. Soil samples were taken from scantily and densely vegetated stream reaches, as well as measurements of channel widths and depths. Analyses of soil physical properties viz; grain size distribution, bulk density, soil texture and aggregate stability were done. Results demonstrated that a sparse riparian vegetation distribution was consistent with the communal villages, confined to the upper catchment area. Dense riparian vegetation distribution was consistent with former commercial farms in the lower catchment area. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2021
- Full Text:
- Date Issued: 2021-12
A spatio-temporal, landscape perspective on Acacia dealbata invasions and broader land use and cover changes in the northern Eastern Cape, South Africa
- Gouws, Aidan J, Prof.Shackleton, Charlie M
- Authors: Gouws, Aidan J , Prof.Shackleton, Charlie M
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/179670 , vital:43156 , xlink:href="https://doi.org/10.1007/s10661-019-7204-y"
- Description: Biological invasions and human land use both have the potential to drastically alter the patterns and processes of landscapes, driving habitat fragmentation and altering natural disturbance regimes. The proliferation of an invasive species depends on composition and configuration of the landscape, as well as the invasiveness of the species. To effectively manage a highly invasive species, such as Acacia dealbata, it is crucial to understand the historical progression of the invasion within the landscape. This study sought to examine the landscape dynamics of biological invasions by tracking the historical spread of A. dealbata and broader land use/land cover (LULC) changes at different spatiotemporal scales in the northern Eastern Cape. A timeseries of aerial photographs were systematically classified according to designated A. dealbata and LULC categories in ArcGIS to track the changes in the extent and rate of spread of A. dealbata. Markedly dynamic, multi-directional, and spatio-temporally variable LULC transitions were observed across the northern Eastern Cape over the last six decades. A. dealbata frequently retained a high proportion of cover over time, and despite the loss of cover to other LULC classes, a net increase in A. dealbata cover occurred as it spread at an overall annual rate of 0.11–0.21%, occupying approximately 8–18% of land cover across all sampled sites by 2013.
- Full Text:
- Date Issued: 2019
- Authors: Gouws, Aidan J , Prof.Shackleton, Charlie M
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/179670 , vital:43156 , xlink:href="https://doi.org/10.1007/s10661-019-7204-y"
- Description: Biological invasions and human land use both have the potential to drastically alter the patterns and processes of landscapes, driving habitat fragmentation and altering natural disturbance regimes. The proliferation of an invasive species depends on composition and configuration of the landscape, as well as the invasiveness of the species. To effectively manage a highly invasive species, such as Acacia dealbata, it is crucial to understand the historical progression of the invasion within the landscape. This study sought to examine the landscape dynamics of biological invasions by tracking the historical spread of A. dealbata and broader land use/land cover (LULC) changes at different spatiotemporal scales in the northern Eastern Cape. A timeseries of aerial photographs were systematically classified according to designated A. dealbata and LULC categories in ArcGIS to track the changes in the extent and rate of spread of A. dealbata. Markedly dynamic, multi-directional, and spatio-temporally variable LULC transitions were observed across the northern Eastern Cape over the last six decades. A. dealbata frequently retained a high proportion of cover over time, and despite the loss of cover to other LULC classes, a net increase in A. dealbata cover occurred as it spread at an overall annual rate of 0.11–0.21%, occupying approximately 8–18% of land cover across all sampled sites by 2013.
- Full Text:
- Date Issued: 2019
A stability-indicating high performance liquid chromatographic assay for the determination of orlistat in capsules
- Mohammadi, Ali, Haririan, I, Rezanour, Nasrin, Ghiasi, L, Walker, Roderick B
- Authors: Mohammadi, Ali , Haririan, I , Rezanour, Nasrin , Ghiasi, L , Walker, Roderick B
- Date: 2006
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/184267 , vital:44195 , xlink:href="https://doi.org/10.1016/j.chroma.2006.03.038"
- Description: A stability-indicating HPLC method was developed and validated for the quantitative determination of orlistat in capsule dosage forms. An isocratic separation was achieved using a Perfectsil® target ODS-3, 250 mm × 4.6 mm i.d., 5 μm particle size column with a flow rate of 0.7 ml/min and using a UV detector to monitor the eluate at 210 nm. The mobile phase consisted of methanol:acetonitrile:trifluoroacetic acid (82.5:17.5:0.01, v/v/v). The drug was subjected oxidation, hydrolysis, photolysis and heat to apply stress conditions. Complete separation was achieved for the parent compound and all degradation products in an overall analytical run time of approximately 15 min with the parent compound orlistat eluting at approximately 9 min. The method was linear over the concentration range of 0.02–0.75 mg/ml (r = 0.9998) with a limit of detection and quantitation 0.006 and 0.02 mg/ml, respectively. The method has the requisite accuracy, selectivity, sensitivity and precision to assay orlistat in capsules. Degradation products resulting from the stress studies did not interfere with the detection of orlistat and the assay is thus stability-indicating.
- Full Text:
- Date Issued: 2006
- Authors: Mohammadi, Ali , Haririan, I , Rezanour, Nasrin , Ghiasi, L , Walker, Roderick B
- Date: 2006
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/184267 , vital:44195 , xlink:href="https://doi.org/10.1016/j.chroma.2006.03.038"
- Description: A stability-indicating HPLC method was developed and validated for the quantitative determination of orlistat in capsule dosage forms. An isocratic separation was achieved using a Perfectsil® target ODS-3, 250 mm × 4.6 mm i.d., 5 μm particle size column with a flow rate of 0.7 ml/min and using a UV detector to monitor the eluate at 210 nm. The mobile phase consisted of methanol:acetonitrile:trifluoroacetic acid (82.5:17.5:0.01, v/v/v). The drug was subjected oxidation, hydrolysis, photolysis and heat to apply stress conditions. Complete separation was achieved for the parent compound and all degradation products in an overall analytical run time of approximately 15 min with the parent compound orlistat eluting at approximately 9 min. The method was linear over the concentration range of 0.02–0.75 mg/ml (r = 0.9998) with a limit of detection and quantitation 0.006 and 0.02 mg/ml, respectively. The method has the requisite accuracy, selectivity, sensitivity and precision to assay orlistat in capsules. Degradation products resulting from the stress studies did not interfere with the detection of orlistat and the assay is thus stability-indicating.
- Full Text:
- Date Issued: 2006
A statistical study of travelling ionospheric disturbances over the African-European and American sectors
- Authors: Thaganyana, Golekamang Piet
- Date: 2023-03-31
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/422541 , vital:71956 , DOI 10.21504/10962/422543
- Description: This research presents a long-term statistical study of travelling ionospheric disturbances (TIDs) of low- and high-latitude origin over the American and African-European sectors between 2010 and 2018. The TIDs of low latitude origin (hereafter known as poleward TIDs) were studied in both quiet and disturbed conditions, whereas the equatorward TIDs were only studied during quiet conditions. The Kp > 4 and Dst_ -50 nT was used as a criterion for geomagnetic disturbed conditions, while the four geomagnetically quiet days were selected each month based on Kp < 3. Observations of TIDs are made using Global Navigational Satellite Systems (GNSS) total electron content derived data. During quiet conditions, seven and two transhemispheric TIDs were identified over the African-European and American sectors, respectively. The observed TIDs originated from the wintertime hemisphere and propagated into the summertime hemisphere. The horizontal velocity, periods, and horizontal wavelengths of TIDs are in range of cH = 120-274 m/s, 48-80 min and _H = 379-1104 km, respectively. These quiet-time equatorward TIDs have been associated with tertiary gravity waves (GWs) from the dissipation of secondary GWs which are in turn generated from the dissipation of mountain waves (MWs) as a result of excited orographic forcing. The poleward TIDs during geomagnetically quiet conditions over the African and American sectors occur mainly during local daytime. Poleward TIDs were observed mostly in the African-European sector than the American sector. Their horizontal propagation velocities and periods range between 129-280 m/s and 39-70 min over African-European and American sectors. Although the mechanisms responsible for launching quiet-time poleward TIDs have not been established in this study, lower atmospheric processes such as convection systems, sudden stratospheric warming and cold weather fronts may have a role in their generation. During geomagnetic storms in the African sector, almost all poleward TIDs (with the exception of two cases) during the main phase were large-scale with horizontal velocities and periods ranging from 250-503 m/s and 30 min to 2 hours. During recovery phase, poleward TIDs fall under the category of medium scale. In the American sector, the majority of poleward TIDs occurred during the storm's main phase, as opposed to the African-European sector, which experienced a significant number of poleward TIDs during the recovery phase. The periods and horizontal velocities of TIDs range from 45 min-1.5 h and 180-296 m/s during main phase. During the recovery phase, the horizontal velocity and period range from 177-271 m/s and 40-1.5 h, respectively. Overall, it has been shown that statistically, changes in equatorial electrodynamics related to enhanced eastward electric _eld and hence increased equatorial electrojet (vertical E_B drift) correlates highly with the reported poleward TIDs. , Thesis (PhD) -- Faculty of Science, Physics and Electronics, 2023
- Full Text:
- Date Issued: 2023-03-31
- Authors: Thaganyana, Golekamang Piet
- Date: 2023-03-31
- Subjects: Uncatalogued
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/422541 , vital:71956 , DOI 10.21504/10962/422543
- Description: This research presents a long-term statistical study of travelling ionospheric disturbances (TIDs) of low- and high-latitude origin over the American and African-European sectors between 2010 and 2018. The TIDs of low latitude origin (hereafter known as poleward TIDs) were studied in both quiet and disturbed conditions, whereas the equatorward TIDs were only studied during quiet conditions. The Kp > 4 and Dst_ -50 nT was used as a criterion for geomagnetic disturbed conditions, while the four geomagnetically quiet days were selected each month based on Kp < 3. Observations of TIDs are made using Global Navigational Satellite Systems (GNSS) total electron content derived data. During quiet conditions, seven and two transhemispheric TIDs were identified over the African-European and American sectors, respectively. The observed TIDs originated from the wintertime hemisphere and propagated into the summertime hemisphere. The horizontal velocity, periods, and horizontal wavelengths of TIDs are in range of cH = 120-274 m/s, 48-80 min and _H = 379-1104 km, respectively. These quiet-time equatorward TIDs have been associated with tertiary gravity waves (GWs) from the dissipation of secondary GWs which are in turn generated from the dissipation of mountain waves (MWs) as a result of excited orographic forcing. The poleward TIDs during geomagnetically quiet conditions over the African and American sectors occur mainly during local daytime. Poleward TIDs were observed mostly in the African-European sector than the American sector. Their horizontal propagation velocities and periods range between 129-280 m/s and 39-70 min over African-European and American sectors. Although the mechanisms responsible for launching quiet-time poleward TIDs have not been established in this study, lower atmospheric processes such as convection systems, sudden stratospheric warming and cold weather fronts may have a role in their generation. During geomagnetic storms in the African sector, almost all poleward TIDs (with the exception of two cases) during the main phase were large-scale with horizontal velocities and periods ranging from 250-503 m/s and 30 min to 2 hours. During recovery phase, poleward TIDs fall under the category of medium scale. In the American sector, the majority of poleward TIDs occurred during the storm's main phase, as opposed to the African-European sector, which experienced a significant number of poleward TIDs during the recovery phase. The periods and horizontal velocities of TIDs range from 45 min-1.5 h and 180-296 m/s during main phase. During the recovery phase, the horizontal velocity and period range from 177-271 m/s and 40-1.5 h, respectively. Overall, it has been shown that statistically, changes in equatorial electrodynamics related to enhanced eastward electric _eld and hence increased equatorial electrojet (vertical E_B drift) correlates highly with the reported poleward TIDs. , Thesis (PhD) -- Faculty of Science, Physics and Electronics, 2023
- Full Text:
- Date Issued: 2023-03-31
A structural model for sustainable growth of the south African business process outsourcing sector
- Authors: Chinhamo, Edmore
- Date: 2022-04
- Subjects: Outsourcing sector , Contracting out -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/58306 , vital:58970
- Description: he total size of the South African Business Process Outsourcing sector is not growing as quickly as other global BPO locations like the Philippines and India. The sector has been identified by the South African government as a key sector for economic growth and for reducing unemployment. Reviewed frameworks are not exhaustive in providing a framework that is suitable for countries with an apartheid history like South Africa, so, the main aim of this study has been, therefore, to develop a structural model for sustainable growth of the South African BPO sector. The research was two phased: Firstly, it interrogated existing theories and models on BPO growth to identify variables for BPO growth. The variables were identified as talent pool, infrastructure, accessibility, lower costs, and legislative framework. The relationships between variables were hypothesised. The reviewed literature discussed the global economy and traced the origins of outsourcing as rooted in the advent of Information Technology and computer-enabled production which enabled fragmented processes which could be in any part of the world. The literature showed that competition for markets, coupled with a glut of products on the market, forced creativity which resulted in companies seeking operations in low-cost locations. The first popular locations for BPO operations were India and the Philippines, with emerging locations, like South Africa, positioning themselves to tap into this global development. Secondly, a quantitative study was performed using a web-based questionnaire which was sent to a sample of BPO executives in the BPO value chain in South Africa to test relationships among between variables. The results of the study showed statistically significant relationships between talent pool, infrastructure, lower costs, accessibility and legislative framework with BPO growth, albeit with varying degrees of strength. Contrary to popular belief, lower costs are no longer the most important driver of BPO location choice. Accessibility and legislative framework have also been confirmed by data as variables affecting BPO growth. After the computation of the relationships, the research concluded that the model developed is a good fit for BPO growth. , Thesis (PhD) -- Faculty of Engineering, the Built Environment, and Technology, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Chinhamo, Edmore
- Date: 2022-04
- Subjects: Outsourcing sector , Contracting out -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10948/58306 , vital:58970
- Description: he total size of the South African Business Process Outsourcing sector is not growing as quickly as other global BPO locations like the Philippines and India. The sector has been identified by the South African government as a key sector for economic growth and for reducing unemployment. Reviewed frameworks are not exhaustive in providing a framework that is suitable for countries with an apartheid history like South Africa, so, the main aim of this study has been, therefore, to develop a structural model for sustainable growth of the South African BPO sector. The research was two phased: Firstly, it interrogated existing theories and models on BPO growth to identify variables for BPO growth. The variables were identified as talent pool, infrastructure, accessibility, lower costs, and legislative framework. The relationships between variables were hypothesised. The reviewed literature discussed the global economy and traced the origins of outsourcing as rooted in the advent of Information Technology and computer-enabled production which enabled fragmented processes which could be in any part of the world. The literature showed that competition for markets, coupled with a glut of products on the market, forced creativity which resulted in companies seeking operations in low-cost locations. The first popular locations for BPO operations were India and the Philippines, with emerging locations, like South Africa, positioning themselves to tap into this global development. Secondly, a quantitative study was performed using a web-based questionnaire which was sent to a sample of BPO executives in the BPO value chain in South Africa to test relationships among between variables. The results of the study showed statistically significant relationships between talent pool, infrastructure, lower costs, accessibility and legislative framework with BPO growth, albeit with varying degrees of strength. Contrary to popular belief, lower costs are no longer the most important driver of BPO location choice. Accessibility and legislative framework have also been confirmed by data as variables affecting BPO growth. After the computation of the relationships, the research concluded that the model developed is a good fit for BPO growth. , Thesis (PhD) -- Faculty of Engineering, the Built Environment, and Technology, 2022
- Full Text:
- Date Issued: 2022-04
A study of four-dimensional oscillator groups and the associated left-invariant control affine systems
- Authors: Biggs, Rory
- Date: 2012
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/164941 , vital:41186
- Description: Thesis (MSc)--Rhodes University, Faculty of Science, Department of Mathematics, 2012
- Full Text:
- Date Issued: 2012
- Authors: Biggs, Rory
- Date: 2012
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Masters , MSc
- Identifier: http://hdl.handle.net/10962/164941 , vital:41186
- Description: Thesis (MSc)--Rhodes University, Faculty of Science, Department of Mathematics, 2012
- Full Text:
- Date Issued: 2012
A Study of grade 3 teachers' practices of developing learners' comprehension skills when teaching reading of isiXhosa in one selected junior primary school at Mdatsane in the Eastern cape: a case study
- Authors: Filita, Mandisa
- Date: 2014
- Subjects: Reading comprehension , Xhosa language , Teachers -- Training of -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/26448 , vital:65318
- Description: The problem of reading in South African schools has attracted the growing attention of researchers in South Africa and the entire world. Learners’ inability to read isiXhosa with understanding has become of major concern to the teachers, parents and the DoE. The root of the problem has been identified as the ineffective teaching of reading of isiXhosa in the schools, which result in learners’ consequent inability to independently apply comprehension skills to learn from reading across the curriculum. Furthermore, systemic barriers that exist in the education system seem to be another reason for learners’ reading problems in isiXhosa. Also there is the problem of the inadequately trained teachers in the home language of learners (isiXhosa) as they seemingly lack capacity to develop learners’ literacy to effective levels. In addition, many learners come from deprived print environments where texts are seldom part of their daily experience. The main aim of this study was to interrogate the practices undertaken by teachers in trying to develop comprehension skills of learners when reading in isiXhosa and the value they attach to reading generally and to the reading of isiXhosa in particular. The support teachers get from relevant stakeholders was also considered. The overall approach used was a qualitative approach. The study was structured according to the case study mode of enquiry, using the interpretive paradigm. The sampling used was purposive as I purposefully selected grade 3 teachers, as grade 3 is an exit grade in foundation phase. Furthermore, convenience sampling was also used for easy access, as the research site was the school where I work. The instruments used for data collection were semi-structured interviews and observations that were conducted in one junior primary school in a township context with four grade 3 teachers. It was found that as much as teachers’ practices have a contributing effect on learners’ inability to read isiXhosa with understanding, there are also various other factors which multiply the problem. The study reveals the following main findings: Firstly, the teachers believe that reading is a very important skill that needs to be developed with learners as all other learning is based on it. , Thesis (MEd) -- Faculty of Education, 2014
- Full Text:
- Date Issued: 2014
- Authors: Filita, Mandisa
- Date: 2014
- Subjects: Reading comprehension , Xhosa language , Teachers -- Training of -- South Africa
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/26448 , vital:65318
- Description: The problem of reading in South African schools has attracted the growing attention of researchers in South Africa and the entire world. Learners’ inability to read isiXhosa with understanding has become of major concern to the teachers, parents and the DoE. The root of the problem has been identified as the ineffective teaching of reading of isiXhosa in the schools, which result in learners’ consequent inability to independently apply comprehension skills to learn from reading across the curriculum. Furthermore, systemic barriers that exist in the education system seem to be another reason for learners’ reading problems in isiXhosa. Also there is the problem of the inadequately trained teachers in the home language of learners (isiXhosa) as they seemingly lack capacity to develop learners’ literacy to effective levels. In addition, many learners come from deprived print environments where texts are seldom part of their daily experience. The main aim of this study was to interrogate the practices undertaken by teachers in trying to develop comprehension skills of learners when reading in isiXhosa and the value they attach to reading generally and to the reading of isiXhosa in particular. The support teachers get from relevant stakeholders was also considered. The overall approach used was a qualitative approach. The study was structured according to the case study mode of enquiry, using the interpretive paradigm. The sampling used was purposive as I purposefully selected grade 3 teachers, as grade 3 is an exit grade in foundation phase. Furthermore, convenience sampling was also used for easy access, as the research site was the school where I work. The instruments used for data collection were semi-structured interviews and observations that were conducted in one junior primary school in a township context with four grade 3 teachers. It was found that as much as teachers’ practices have a contributing effect on learners’ inability to read isiXhosa with understanding, there are also various other factors which multiply the problem. The study reveals the following main findings: Firstly, the teachers believe that reading is a very important skill that needs to be developed with learners as all other learning is based on it. , Thesis (MEd) -- Faculty of Education, 2014
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- Date Issued: 2014