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“Turn on” fluorescence enhancement of Zn octacarboxyphthaloyanine-graphene oxide conjugates by hydrogen peroxide

  • Authors: Shumba, Munyaradzi , Mashazi, Philani N , Nyokong, Tebello
  • Date: 2016
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/190438 , vital:44994 , xlink:href="https://doi.org/10.1016/j.jlumin.2015.11.001"
  • Description: Zn octacarboxy phthalocyanine-reduced graphene oxide or graphene oxide conjugates were characterized by absorption spectroscopy, transmission electron microscopy, fluorescence spectroscopy, X-ray diffraction, thermo gravimetric analysis and X-ray photon spectroscopy. The presence of reduced graphene oxide or graphene oxide resulted in the quenching (turn on) of Zn octacarboxy phthalocyanine fluorescence which can be explained by photoinduced electron transfer. Zn octacarboxy phthalocyaninereduced graphene oxide or graphene oxide conjugates “turned on” fluorescence showed a linear response to hydrogen peroxide hence their potential to be used as sensors. The nanoprobe developed showed high selectivity towards hydrogen peroxide in the presence of physiological interferences.
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  • Date Issued: 2016

Spatial modelling of accessibility to tuberculosis treatment: the case of Ngaka Modiri Molema District

  • Authors: Ramotsongwa, Karabo Naome
  • Date: 2022-04
  • Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/55435 , vital:52000
  • Description: Accessibility to healthcare refers to the availability, or the provision of healthcare-byhealthcare professionals and stakeholders and individuals' ability to obtain care and treatment. It affects overall physical, social, and mental health; disease and disability prevention; detection and treatment of health conditions; standard of living; preventable death; and life expectancy, and it is crucial to the performance of health care systems around the world. If healthcare services are available and are in sufficient supply, people will be able to seek health care, and a population will have access to services. The leading cause of death globally is Tuberculosis (TB) and South Africa is amongst the top 5 countries most affected by TB. This is aggravated by high HIV/AIDS statistics. Children belowthe age of 4, between the ages of 4- 15, and women and men of working ages are highly affected by TB and it is the primary cause of death in these groups in the Ngaka Modiri Molema District. This study used study tools like Spatial Modelling, Geographic Information Systems and software like ArcGIS 10.5, TerrSet IDRISI 18.30, and secondary data from the North West Departmentof Health (Tier.net &DHIS) and also TB patients’ home addresses to investigate the accessibility of TB treatment in Ngaka Modiri Molema, in order to spatially visualize the distribution of a communicable disease like TB and public healthcare facilities in the Ngaka Modiri Molema (NMM) District and suggest optimum sites for hospital facilities. , Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 2022
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  • Date Issued: 2022-04

Indigenous knowledge systems and gender relations interface and its implications for food security: the case of Khambashe rural households in the Amathole District, South Africa

  • Authors: Garutsa, T C https://orcid.org/0000-0003-1904-2764
  • Date: 2015-01
  • Subjects: Food security -- South Africa -- Eastern Cape , Indigenous peoples -- South Africa -- Eastern Cape
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10353/26581 , vital:65660
  • Description: The aim of this study was to find out about how the intersection of indigenous knowledge systems and gender relations affects food security in the rural households of the Khambashe village in the Eastern Cape. The focus is on food security-related indigenous knowledge utilized by women rather than the general indigenous knowledge of the people in the Eastern Cape. Ample literature exists on food security and gender, food security and indigenous knowledge systems and the role of gender dynamics in the application of indigenous knowledge systems. However, there is dearth of literature on studies on the role of the indigenous knowledge systems-gender relations interface in food security. Hence this study was directed at investigating the indigenous knowledge systems-gender dynamics interplay and its implications for food security and sustainable development with specific reference to the rural households of Khambashe village of the Eastern Cape Province. Furthermore, the study seeks to determine factors accounting for the attrition of women’s indigenous knowledge in food production systems of the Khambashe rural households. The main position advanced in this thesis is that domination coupled with marginalisation of women and indigenous knowledge systems by hegemonic Western power/knowledge and traditional African practices account for challenges faced by rural households with regard to food security and sustainable livelihoods. Put differently, the core argument of this study is that the intersection between gender and indigenous knowledge systems has two opposing possibilities for food security. On the one hand, through the various roles of women in the application of indigenous knowledge systems in rural areas, the indigenous knowledge and gender relations interplay can operate to enhance the likelihood of achieving sustainable rural livelihoods and hence food security. On the other hand, gender oppression, subjugation, exclusion and marginalization through various practices such as the utilization of discriminatory patriarchal cultural values and norms can inhibit the application of the rich folk knowledge reservoir of ideas held by women in food production processes. Key illustrative examples of the constraints imposed by cultural traditions that pose problems for the realization of sustainable rural livelihoods are cultural practices which prohibit women to inter alia own and inherit land. These cultural practices also deprive women the liberty to make their own decisions without the consultation of men despite being sole providers of their own households. In other words, lack of access to assets and other resources owing to the marginalization of local knowledge by the dominant Western-based scientific knowledge systems and culturally-derived gender discriminatory practices make the role of women in the process of utilizing indigenous knowledge systems for the purposes of food security difficult. The theoretical framework of this study is drawn from the post-development discourse derived from Foucault’s archaeology of power and knowledge, ecofeminism and African feminism. Such a framework has a utility to reinvigorate marginalised indigenous knowledge and thereby help women reclaim their leadership in processes of ensuring food security. In a situation where indigenous knowledge systems have been excluded and subjugated by the dominant Western knowledge systems, an extended post-development discourse of this nature is transformative. While Foucault’s theory will provide key insights around power/knowledge dynamics and issues, ecofeminism and African feminism will extend these insights in the exploration of the patterns of power in both the knowledge and gender relations domains. In fact interactions in food production processes are embedded in systematized knowledge and traditional gender relations. Hence, in order to ensure a deep-going analysis of these phenomena, Foucault’s framework on power/knowledge is augmented by the ideas of ecofeminism and African feminism owing to the fact that systems of domination whether in the knowledge arena or gender relations domain are responsible for the challenges relating to food secure households and sustainable rural livelihoods. The rationale for this approach is that subjugation and marginalization of indigenous knowledge systems by Western hegemonic power/knowledge coupled with exclusionary and discriminatory practices of patriarchal cultural values is seen as inhibiting the proper application of indigenous knowledge in food production processes. The extended post-development discourse adopted for this study takes into consideration the fact that oppression and discrimination the world over has taken the Foucauldian power/knowledge dimension in the sense that women in rural African settings are not only prevented by Western science from the application of indigenous knowledge for the development of sustainable livelihoods but that their own cultural traditions are also a hindrance towards them owning land and property, making their own decisions without recourse to men and exercising their own authority. A mixed method approach combining qualitative and quantitative research design was utilized in order to gain a full grasp of nuances of the interface between indigenous knowledge and gender dynamics in food production processes in Khambashe. This methodological triangulation was used for purposes of enhancing the capturing of comprehensive data and a holistic understanding of food security issues in the area. Further, owing to the fact that survey questionnaires as research instruments would have not given a voice to women as key research participants and that the deployment of in-depth interviews alone as research tools would have compromised the generalizability of the findings of the study, each of the two research methods were to confirm, clarify, complement, enhance and elaborate the research results of the other. In other words, in order to counterbalance the limitation of questionnaires with regard to artificiality and not affording a voice to research participants in-depth interviews were conducted. The lack of generalizability of the latter was compensated by the high degree of representativity afforded by the use of the former (that is, questionnaires). As already indicated above, the study setting for the empirical data was the Khambashe village in the Eastern Cape. Information gathered included the more positive effects of the IK-gender relations interplay on food security covered in Chapter 7. This chapter described and analysed the various roles women play inter alia animal husbandry, crop production, creation and utilization of indigenous technology in food production processes and in post-harvesting practices. In contrast, chapter 8 investigated and discusses the various constrains which account for the hindrance in the operationalization of IK in food production processes by women. Chief among the identified constrains in Khambashe are the marginalization of local knowledge by hegemonic Western science and the discriminatory traditional practices. The research results of this study show that despite the key role of women in the application of local knowledge, practices and technologies in food production processes, the penetration, colonization and domination of the African socio-economic and cultural sphere by the West has resulted in the deterioration in the use of indigenous knowledge. Imperialistic Western knowledge masquerading as modern science and technology manifested in inter alia chemical fertilizers and modified food is a constraint to the utility of women’s indigenous knowledge and practices that ensures both food security and sustainable development. In view of the fact that failure to utilize readily available indigenous knowledge, practices and technologies owing to the marginalisation of local epistemes by Western science and the discriminatory African traditional practices and gender relations has led to further impoverishment of rural communities, there is a need to both empower women and to revitalize their indigenous knowledge for purposes of food security and sustainable development in rural areas such as Khambashe. , Thesis (PhD) -- Faculty of Social Sciences & Humanities, 2015
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  • Date Issued: 2015-01

The relationship between green behaviours and their effect on the performance of small businesses in South Africa

  • Authors: Banana, Zingisa
  • Date: 2021-01
  • Subjects: Small business--Management , Environmental economics
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/21377 , vital:48514
  • Description: Purpose: Academics and the government are placing more emphasis and importance on the role that enterprises can play in response to challenges of the environment. This study aimed to establish the relationship between green behaviours and the performance of small businesses in South Africa. Green behaviours are measured as consisting of green entrepreneurial orientation, green technology dynamism and green innovation behaviour. Conversely, performance is defined as consisting of environmental performance, objective performance and subjective performance. Design/methodology/approach: To achieve the purpose of this study, the study adopted a positivist paradigm which is motivated by the quantitative approach using a descriptive research design. Self-administered questionnaires were employed with a sample of 180 participants that were randomly selected across small businesses in the Buffalo City Metropolitan Municipality in the Eastern Cape province of South Africa. Findings/results: The major findings of the study, using simple linear regression analysis, revealed that a significant positive relationship between green entrepreneurial orientation and environmental, objective and subjective performance does exist. However, the hierarchical regression analysis results revealed that green technology dynamism and green innovation behaviour do not moderate the relationship between green entrepreneurial orientation and performance as measured by environmental, objective and subjective performance dimensions. Practical implications: Based on the findings of the study, small businesses need to develop policy related to promoting green behaviours, given that green entrepreneurial orientation has been found to be related to performance. Originality/value: The results of this study could guide small business owners and managers in the implementation of environmentally-friendly practices in an effort to reduce green economy issues and environmental problems facing the present generation. , Thesis (MCom) (Business Management) -- University of Fort Hare, 2021
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  • Date Issued: 2021-01

Syntheses and electrochemical characterization of new water soluble octaarylthiosubstituted manganese phthalocyanines

  • Authors: Booysen, Irvin N , Matemadombo, Fungisai , Durmus, Mahmut , Nyokong, Tebello
  • Date: 2011
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/247614 , vital:51600 , xlink:href="https://doi.org/10.1016/j.dyepig.2010.09.012"
  • Description: This paper reports on the synthesis and characterization of new manganese phthalocyanine (MnPc) complexes: 2,3-octakis-[(2-mercaptopyridine) phthalocyaninato] acetato manganese (III) (1) and its quaternized (hence water soluble) derivative: 2,3-octakis-{[(N-methyl-2-mercaptopyridine) phthalocyaninato] acetato manganese (III)} sulphate (2). The complexes were used to form self assembled monolayers (SAMs). Voltammetry proved that both of the SAMs are well packed, strongly passivating and act as selective and efficient barriers to ion permeability. Furthermore, surface coverage studies confirmed that the MPc macrocycles adsorb onto the gold electrode as monolayers. Both MPc SAMs were successfully used as electrochemical sensors of nitrite.
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  • Date Issued: 2011

Characterization of bioflocculants produced by consortia of three marine bacteria belonging to the genera bacillus and cobetia previously isolated from the bottom sediment of Algoa Bay in the Eastern Cape Province of South Africa

  • Authors: Ugbenyen, Anthony Moses https://orcid.org/0000-0002-1381-3428
  • Date: 2013
  • Subjects: Water -- Purification -- Flocculation , Water quality management , Flocculation
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10353/24454 , vital:62804
  • Description: The bioflocculant-producing potentials of three marine bacteria isolated from the sediment samples of Algoa Bay in the Eastern Cape Province of South Africa were assessed. Analysis of the partial nucleotide sequence of the 16S rDNA of the bacteria revealed 99 percent, 99 percent, and 98 percent similarity to Cobetia sp. L222, Bacillus sp. A-5A, and Bacillus sp. HXG-C1 respectively and the sequence was deposited in GenBank as Cobetia sp. OAUIFE, Bacillus sp. MAYA and Bacillus sp. Gilbert (accession number JF799092, JF799093, and HQ537128 respectively). Cultivation condition studies for Cobetia sp. OAUIFE revealed that bioflocculant production was optimal with an inoculum size of 2 percent (v/v), initial pH of 6.0, Mn2+ as the metal ion, and glucose as the carbon source. Metal ions, including Na+, K+, Li+, Ca2+and Mg2+ stimulated bioflocculant production resulting in flocculating activity of above 90 percent. This crude bioflocculant is thermally stable, with about 78 percent of its flocculating activity remaining after heating at 100 oC for 25 min. Analysis of the purified bioflocculant revealed it to be an acidic extracellular polysaccharide. FTIR analysis revealed the presence of methoxyl, hydroxyl, and carboxyl - groups in the compound bioflocculant and SEM micrograph of the bioflocculant revealed a crystal-linear structure. On the other hand, bioflocculant production by Bacillus sp. MAYA was optimal when glucose (95.6 percent flocculating activity) and ammonium nitrate (83.3 percent flocculating activity) were used as carbon and nitrogen sources respectively; inoculum size was 2 percent (v/v); initial pH 6; and Ca2+ as coagulant aid. Chemical analysis of the purified bioflocculant shows that it is composed of uronic acid, neutral sugar and protein. FTIR analysis also revealed the presence of methoxyl, hydroxyl, carboxyl and amino- groups in this bioflocculant. The bioflocculant is thermostable with about 65.6 percent residual flocculating activity retained after heating the bioflocculant at 100 oC for 25 min. However bioflocculant production by Bacillus sp. Gilbert was optimal when sodium carbonate (95.2 percent flocculating activity) and potassium nitrate (76.6 percent flocculating activity) were used as carbon and nitrogen sources respectively; inoculum size was 3 percent (v/v); initial pH 9; and Al3+ as cation. The crude bioflocculant retained 44.2 percent residual flocculating activity after heating at 100 oC for 15 min. FTIR analysis reveals the presence of hydroxyl, carboxyl and methylene - groups in the compound bioflocculant. SEM micrograph of the bioflocculant revealed an amorphous compound. The consortia of these bacteria strains also produced bioflocculants with high flocculating activities which were highly efficient in removing turbidity and chemical oxygen demand (COD) from brewery wastewater, diary wastewater and river water. The bioflocculants from the consortia seemed better than traditional flocculants such as alum . The characteristics of the bioflocculant produced by the consortium of Cobetia sp. OAUIFE and Bacillus sp. MAYA showed that this extracellular bioflocculant, composed of 66percent uronic acid and 31percent protein and an optimum flocculation (90 percent) of kaolin suspension, when the dosage concentration was 0.8 mg/ml, under weak alkaline pH of 8, and Ca2+ as a coagulant aid. The bioflocculant is thermally stable, with a high residual flocculating activity of 86.7 percent, 89.3 percent and 87.0 percent after heating at 50 oC, 80 oC and 100 oC for 25 min respectively. The FTIR analysis of the bioflocculant indicated the presence of hydroxyl, amino, carbonyl and carboxyl functional groups. Scanning electron microscopy (SEM) image revealed a crystal-linear spongy-like bioflocculant structure and EDX analysis of the purified bioflocculant showed that the elemental composition in mass proportion of C,N,O,S and P was 6.67:6.23:37.55:0.38:4.42 (percent w/w). However, the characteristics of the bioflocculant produced by the consortium of Cobetia sp OAUIFE and Bacillus sp. Gilbert showed an optimum flocculation (90 percent) of kaolin suspension when the dosage concentration was 0.2 mg/ml, under neutral pH of 7, and Ca2+ as a coagulant aid. The FTIR analysis of the bioflocculant indicated the presence of hydroxyl and carbonyl functional groups. Scanning electron microscopy (SEM) image revealed an amorphous morphology. On the other hand the bioflocculant produced by the consortium of Bacillus sp. MAYA and Bacillus sp. Gilbert showed similar characteristic with the bioflocculant from the consortium of Cobetia sp. OAUIFE and Bacillus sp. Gilbert except for Al3+ being the preferred coagulant aid. The characteristics of the bioflocculant produced by the consortium of Cobetia sp. OAUIFE, Bacillus sp. MAYA and Bacillus sp. Gilbert showed an optimum flocculation (87 percent) of kaolin suspension when the dosage concentration was 1.0 mg/ml. Under strong alkaline pH of 12, flocculating activity reached (95 percent) when Al3+ was the coagulant aid. The FTIR analysis of the bioflocculant indicated the presence of hydroxyl, amino, carbonyl and carboxyl and phosphoryl functional groups. Scanning electron microscopy (SEM) image revealed a flaky amorphous morphological structure. Due to the excellent COD and turbidity removal efficiencies of the bioflocculants produced by the consortia, these make those attractive candidates for use in water and wastewater treatment. , Thesis (PhD) -- Faculty of Science and Agriculture, 2013
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  • Date Issued: 2013

Capital flows and real exchange rate movement in South Africa

  • Authors: Lindani, Sandiswa
  • Date: 2021-09
  • Subjects: Foreign exchange rates , Exchange rate pass-through , Capital movements
  • Language: English
  • Type: Master's/ theses , text
  • Identifier: http://hdl.handle.net/10353/20417 , vital:45664
  • Description: The neoclassical theory suggests that free flow of external capital should be equilibrating and thereby facilitating smoothening of an economy's consumption or production patterns. Based on this background, this study empirically examines the extent to which the different forms of capital flows amongst other variables influence the real exchange rate in South Africa for the period 1980 to 2019, using annual data. Estimation techniques employed include the Johansen Co-integration Approach and the Vector error correction model (VECM). The variables were found to be co-integrated, with six co-integrating vectors existing. The long-run results revealed that FPI has an appreciating effect on the exchange rate in South Africa. Based on the results, policy recommendations are suggested. , Thesis (MCom) (Economics) -- University of Fort Hare, 2021.
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  • Date Issued: 2021-09

An investigation of support services available for black female owners of bed & breakfasts in Makhanda

  • Authors: Mdluli, Lukhona Silubonile
  • Date: 2021-04
  • Subjects: Bed and breakfast accommodations -- South Africa -- Makhanda , Businesspeople, Black -- South Africa -- Makhanda , Business enterprises, Black -- South Africa -- Makhanda , Women-owned business enterprises -- South Africa -- Makhanda , Government aid to small business -- South Africa , Small business -- South Africa -- Makhanda , Racism -- South Africa -- Makhanda , Businesswomen -- South Africa -- Makhanda
  • Language: English
  • Type: thesis , text , Masters , MBA
  • Identifier: http://hdl.handle.net/10962/177181 , vital:42797
  • Description: Over the last 26 years, the South African government has committed to SMME development. To do this, policies and support institutions were put in place which would create a favourable environment for SMME development. This was particularly important as after 1994, when the South African economy was re-integrated into global markets after years of having sanctions imposed against the country as a result of the apartheid system. The tourism industry was identified as one of the key economic drivers which would strengthen the economy and assist in job creation, especially since South Africa would be able to attract international tourists. Further, it created the opportunity for new participants to enter the industry, including black entrepreneurs who previously could not enter the industry as a result of the apartheid laws. The opening up of the country to international markets and the focus on the tourism industry also presented the opportunity for new forms of tourism to be explored including township tourism, which gave rise to the black-owned bed & breakfast sector. Over time, it has become evident that black entrepreneurs in this sector are facing a number of challenges, in spite of the pro-SMME policies and support institutions that are in place. Because this study seeks to investigate the support services available for black female bed & breakfast owners in Makhanda, a qualitative research approach using the interpretative theoretical framework was applied. By using semi-structured interview questions, to establish what challenges do black female bed and breakfast owners face the researcher was able to respond to the following; what participants identify as their needs; and whether they are able to access the support services that are made available by the Government. Results indicated that the majority of entrepreneurs have difficulty accessing funding to develop their businesses. The seasonality of Grahamstown/ Makhanda tourism businesses has its pros and cons for tourism entrepreneurs. Despite efforts by government to transform the tourism industry, black female entrepreneurs in this industry still experience a myriad of challenges, including passive racism. Insufficient institutional support and inaccessible support services for women have made it difficult to manage in this this environment. Thus, a recommendation is put forward for female focused entrepreneurship policy, which is more responsive in terms of a judicial and legal system(s) aimed at addressing women’s particular needs and challenges. , Thesis (MBA) -- Faculty of Commerce, Rhodes Business School, 2021
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  • Date Issued: 2021-04

Exploring the potential of developmental work research and change laboratory to support sustainability transformations: a case study of organic agriculture in Zimbabwe

  • Authors: Mukute, Mutizwa , Mudokwani, Kuda , McAllistair, Georgina , Nyikahadzoi, Kefasi
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/392119 , vital:68723 , xlink:href="https://doi.org/10.1080/10749039.2018.1451542"
  • Description: This paper explores the emergence of transgressive learning in CHAT-informed development work research in a networked organic agriculture case study in Zimbabwe, based on intervention research involving district organic associations tackling interconnected issues of climate change, water, food security and solidarity. The study established that We change laboratories can be used to support transgressive learning through: confronting unproductive local norms; collective reframing of problematic issues; stimulating expansive learning and sustainability transformations in minds, relationships and landscapes across time. The study also confirms the need for fourth generation CHAT to address the complex social-ecological problems of today.
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  • Date Issued: 2018

The photophysical properties of multi-functional quantum dots-magnetic nanoparticles—indium octacarboxyphthalocyanine nanocomposite

  • Authors: Tshangana, Charmaine , Nyokong, Tebello
  • Date: 2015
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/189876 , vital:44942 , xlink:href="https://doi.org/10.1007/s10895-014-1497-6"
  • Description: This work presents the development of a multifunctional hybrid nanoparticle made of L-glutathione capped quantum dots (GSH-CdSe@ZnS), amino functionalized Fe3O4 magnetic nanoparticles and indium octacarboxy phthalocyanine (ClInPc(COOH)8). In this work we investigate the photophysical properties of the individual components and the hybrid nanoparticle, in addition we study the energy transfer (Förster Resonance Energy Transfer (FRET)) in the complex. FRET efficiencies of ~48 % were obtained for energy transfer between the QDs (when alone or linked to MNPs). Both triplet yields and lifetimes of ClInPc(COOH)8 increase in the nanocomposite, with a decrease in fluorescence lifetime. The hybrid nanoparticle showed improved photophysical properties and as a result can be used in photodynamic therapy.
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  • Date Issued: 2015

Applying insights from machine learning towards guidelines for the detection of text-based fake news

  • Authors: Ngada, Okuhle
  • Date: 2021-12
  • Subjects: Machine learning , Fake News
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/60243 , vital:64141
  • Description: Web-based technologies have fostered an online environment where information can be disseminated in a fast and cost-effective manner whilst targeting large and diverse audiences. Unfortunately, the rise and evolution of web-based technologies have also created an environment where false information, commonly referred to as “fake news”, spreads rapidly. The effects of this spread can be catastrophic. Finding solutions to the problem of fake news is complicated for a myriad of reasons, such as: what is defined as fake news, the lack of quality datasets available to researchers, the topics covered in such data, and the fact that datasets exist in a variety of languages. The effects of false information dissemination can result in reputational damage, financial damage to affected brands, and ultimately, misinformed online news readers who can make misinformed decisions. The objective of the study is to propose a set of guidelines that can be used by other system developers to implement misinformation detection tools and systems. The guidelines are constructed using findings from the experimentation phase of the project and information uncovered in the literature review conducted as part of the study. A selection of machine and deep learning approaches are examined to test the applicability of cues that could separate fake online articles from real online news articles. Key performance metrics such as precision, recall, accuracy, F1-score, and ROC are used to measure the performance of the selected machine learning and deep learning models. To demonstrate the practicality of the guidelines and allow for reproducibility of the research, each guideline provides background information relating to the identified problem, a solution to the problem through pseudocode, code excerpts using the Python programming language, and points of consideration that may assist with the implementation. , Thesis (MA) --Faculty of Engineering, the Built Environment, and Technology, 2021
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  • Date Issued: 2021-12

Comparative electrooxidation of nitrite by electrodeposited Co (II), Fe (II) and Mn (III) tetrakis (benzylmercapto) and tetrakis (dodecylmercapto) phthalocyanines on gold electrodes

  • Authors: Agboola, Bolade , Nyokong, Tebello
  • Date: 2007
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/281212 , vital:55702 , xlink:href="https://doi.org/10.1016/j.aca.2007.01.031"
  • Description: This work reports on the electrooxidation of nitrite using Co(II), Fe(II) and Mn(III) tetrakis (benzylmercapto) and tetrakis (dodecylmercapto) phthalocyanines electrodeposited onto a gold electrode. Good catalytic activity (in terms of lowering overpotential) was obtained for these molecules when compared to previously reported MPc catalysts. The catalytic current was found to vary linearly with nitrite concentration in the range employed in this work (0.1–1 mM) and high sensitivities ranging from 6.9 to 9.9 μA mM−1 were observed for all the modified electrodes.
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  • Date Issued: 2007

Assessing service delivery protests in the Nelson Mandela Bay Municipality: the case of Walmer Township

  • Authors: Mdanyana, Esethu
  • 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/10948/54492 , vital:46609
  • Description: In many South Africa’s areas, citizen’s frustration with poor or slow service delivery has resulted in a surge of service delivery protests. Some of these service delivery protests are violent in nature, resulting in the damage of public and private property. Therefore, it is imperative to scrutinize service delivery protests. The South African constitution states that municipalities have the responsibility to make sure that all citizens are provided with services to satisfy their basic needs. These services include water supply, sewage collection and disposal electricity, gas supply health services, roads, storm water drainage, street lighting, municipal parks and recreation. , Thesis (MA) -- Faculty of Humanities, School of Governmental and Social Sciences, 2021
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  • Date Issued: 2021-12

Modifcations to gravitational waves due to matter shells

  • Authors: Naidoo, Monogaran
  • Date: 2021-10-29
  • Subjects: Gravitational waves , General relativity (Physics) , Einstein field equations , Cosmology , Matter shells
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10962/191118 , vital:45062 , 10.21504/10962/191119
  • Description: As detections of gravitational waves (GWs) mount, the need to investigate various effects on the propagation of these waves from the time of emission until detection also grows. We investigate how a thin low density dust shell surrounding a gravitational wave source affects the propagation of GWs. The Bondi-Sachs (BS) formalism for the Einstein equations is used for the problem of a gravitational wave (GW) source surrounded by a spherical dust shell. Using linearised perturbation theory, we and the geometry of the regions exterior to, interior to and within the shell. We and that the dust shell causes the gravitational wave to be modified both in magnitude and phase, but without any energy being transferred to or from the dust. This finding is novel. In the context of cosmology, apart from the gravitational redshift, the effects are too small to be measurable; but the effect would be measurable if a GW event were to occur with a source surrounded by a massive shell and with the radius of the shell and the wavelength of the GWs of the same order. We extended our investigation to astrophysical scenarios such as binary black hole (BBH) mergers, binary neutron star (BNS) mergers, and core collapse supernovae (CCSNe). In these scenarios, instead of a monochromatic GW source, as we used in our initial investigation, we consider burst-like GW sources. The thin density shell approach is modified to include thick shells by considering concentric thin shells and integrating. Solutions are then found for these burst-like GW sources using Fourier transforms. We show that GW echoes that are claimed to be present in the Laser Interferometer Gravitational-Wave Observatory (LIGO) data of certain events, could not have been caused by a matter shell. We do and, however, that matter shells surrounding BBH mergers, BNS mergers, and CCSNe could make modifications of order a few percent to a GW signal. These modifications are expected to be measurable in GW data with current detectors if the event is close enough and at a detectable frequency; or in future detectors with increased frequency range and amplitude sensitivity. Substantial use is made of computer algebra in these investigations. In setting the scene for our investigations, we trace the evolution of general relativity (GR) from Einstein's postulation in 1915 to vindication of his theory with the confirmation of the existence of GWs a century later. We discuss the implications of our results to current and future considerations. Calculations of GWs, both analytical and numerical, have normally assumed their propagation from source to a detector on Earth in a vacuum spacetime, and so discounted the effect of intervening matter. As we enter an era of precision GW measurements, it becomes important to quantify any effects due to propagation of GWs through a non-vacuum spacetime Observational confirmation of the modification effect that we and in astrophysical scenarios involving black holes (BHs), neutron stars (NSs) and CCSNe, would also enhance our understanding of the details of the physics of these bodies. , Thesis (PhD) -- Faculty of Science, Mathematics (Pure and Applied), 2021
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  • Date Issued: 2021-10-29

Photodegradation of tetracycline by asymmetrical zinc (II) phthalocyanines conjugated to cobalt tungstate nanoparticles

  • Authors: Mgidlana, Sithi , Sen, Pinar , Nyokong, Tebello
  • Date: 2022
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/300233 , vital:57908 , xlink:href="https://doi.org/10.1016/j.molstruc.2022.132938"
  • Description: This work focused on syntheses of novel asymmetrically tetra substituted Zn phthalocyanines (ZnPc) each containing a single carboxyl group, with the other substituents bearing alkynyl (complex 1) and fluorine containing groups (complexes 2 and 3). The complexes were conjugated to cobalt tungstate nanoparticles and employed as efficient photocatalysts for degradation of tetracycline in water. ZnPc complexes and their conjugates showed good photophysical and photochemical properties behaviour with complex 1 giving higher triplet and singlet oxygen quantum yields compared to 2 and 3. Complex 1 showed higher activity towards the photodegradation of tetracycline compared to complexes 2 and 3, with higher kobs and initial rates for the former. The photocatalysis obeyed the Langmuir-Hinshelwood kinetic model.
  • Full Text:
  • Date Issued: 2022

Profiling Rhodes University students’ substance use during the Covid-19 pandemic lockdown: comparing the AUDIT and CCAPS-62 substance abuse sub-scale

  • Authors: Goosen, Jeslyn Chrismaré
  • Date: 2022-10-14
  • Subjects: College students Substance use South Africa Makhanda , College students Alcohol use South Africa Makhanda , College students Mental health South Africa Makhanda , College students Attitudes , College students Economic conditions , COVID-19 (Disease) , Rhodes University
  • Language: English
  • Type: Academic theses , Master's theses , text
  • Identifier: http://hdl.handle.net/10962/405974 , vital:70224
  • Description: Students are vulnerable to academic distress and mental health concerns. Many struggle to effectively cope with the many demands placed on them from various factions; included but not limited to institutional demands, financial concerns, and parental expectations. With the most recent outbreak of the SARS-Co V-2 (better known as the COVID-19 pandemic) many students have struggled to effectively cope with the changes relating to the nationwide lockdown. Universities had to change the way in which they provide students with the necessary academic material, and many had to return to their familial homes. This had a deleterious effect on the way students performed their daily activities and coping. A rise in impaired mental health was noted. Many students used alcohol as a means of coping during this tumultuous and unprecedented time. Undergraduate students at Rhodes University were asked to complete a survey questionnaire via SurveyMonkey, an online survey service. Data was collected over a ten-day period during July 2020. The AUDIT and the CCAPS-62 Substance Use subscale were used to measure their alcohol intake during lockdown and results was compared. Results indicated a significant positive correlation between the CCAPS-62 substance use subscale and the AUDIT (r = 0.80, n = 930, p < 0.01). Outcomes identified that men tend to drink more than females, and white students tend to drink more than black students. Findings suggests that the CCAPS-62 a multidimensional instrument measuring general distress among students could positively contribute to the reliability and validity of the measure used in a multicultural and multilingual society such as South Africa. , Thesis (MA) -- Faculty of Humanities, Psychology, 2022
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  • Date Issued: 2022-10-14

Assessment of the implementation of performance management system at Mnquma Local municipality of the Eastern Cape Province

  • Authors: Mbiko, Khanyiso Livingstone
  • Date: 2008-12
  • Subjects: Performance -- Management , Personnel management
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/24165 , vital:62439
  • Description: The intention of this study was to assess the implementation of performance management system at the Mnquma local municipality. The municipality of Mnquma has in the past been plagued by service delivery challenges and thus the study sought to ascertain whether the challenges could be attributed to the failures of the performance management system within the municipality. It became apparent from the literature review that for any local municipality to play a meaningful role in ensuring that South Africa achieves the goal of becoming a developmental state, capable of confronting service delivery challenges, there needs to be a proper implementation of the performance management system. The study was also aimed at identifying the factors that support or hinder the implementation of the performance management system within the Mnquma local municipality. In order to achieve this objective, scheduled interviews were conducted with various respondents in the municipality. The respondents included the councilors from the four political parties comprising the municipality council, municipal manager and the rest of the Section 57 managers. The key findings that emerged from the data collected, was that the implementation of the performance management system has not been successful. It is also became apparent that there are brewing political tensions that are likely to affect the political stability of the municipality. In addition, it was also evident that there was a minimal or lack of involvement of the local communities in the municipal affairs such as the development of the Municipal Key Performance Indicators. It would therefore be critical important for the management of the Mnquma local municipality to take into account the results of this study and its recommendations so as to ensure that there is a proper implementation of the performance management system within the municipality. , Thesis (MPA) -- Faculty of Management and Commerce, 2008
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  • Date Issued: 2008-12

Re-imagining Afrikaner masculinity through conceptual fashion design

  • Authors: Smit, Dalton
  • 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/10948/54563 , vital:46708
  • Description: Traditional Afrikaner culture has often been associated with conservative beliefs, giving patriarchal figures such as the husband and father superior status. Although South Africa has undergone social progression, large numbers in Afrikaner communities still live according to old, patriarchal norms. My perceptions of Afrikaner masculinity, informed by my cultural background, enforce patriarchy's functioning in some Afrikaner homes, allowing the development of rigid expectations of a male's self-expression. These mind-sets of what masculinity is do not align with my values, beliefs, and the visual presentation of my identity. With the application of autoethnographic inquiry in this practice-based study, I was able to analyse and interpret the nuanced discrimination against the performance of my male identity in an Afrikaner cultural context. I implemented autoethnographic and practice-based methods to respond to and challenge outdated and conservative views regarding the prevalence of Afrikaner masculine ideals and their negative implications. The contribution of the research practice is FYN BOI, a fictive persona constructed and performed by me. He represents a liberated facet of my identity whose reaction is rejection against the Afrikaner cultural opinions of me, and in turn, is fuelled by the criticism to provoke further and challenge these views. The conceptual garments created are considered his wardrobe, which he uses in his self-expression online. With this unconventional approach to a fashion study, disseminating the research practice online instead of a physical exhibition allows for the study to be accessed to audiences beyond academia's domain. This undertaking intends to contribute to the existing discourse of masculinity and prejudice against individuals' self-expression of their identity. , Thesis (MA) -- Faculty of Humanities, School of Visual and Performing Arts, 2021
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  • Date Issued: 2021-12

Fluorescence behaviour of supramolecular hybrids containing graphene quantum dots and pyrene-derivatized phthalocyanines and porphyrins

  • Authors: Achadu, Ojodomo John , Managa, Muthumuni , Nyokong, Tebello
  • Date: 2017
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/188953 , vital:44801 , xlink:href="https://doi.org/10.1016/j.jphotochem.2016.10.029"
  • Description: Novel pyrene-derivatized zinc and cobalt phthalocyanines (Pcs) and porphyrins (Ps) were immobilized on graphene quantum dots (GQDs) to form GQDs-Pcs and GQDs-Ps supramolecular hybrids via the π–π stacking interaction method. Spectroscopic evidence shows that the resultant hybrids were stable owing to the strong π–π stacking interaction between the GQDs and the respective Pcs and Ps, thus leading to the fabrication of interesting and functional supramolecular hybrids by taking advantage of the delocalized π electron systems of GQDs and the macrocycles. The conjugates showed increased fluorescence quantum yields for the Pcs/Ps, but decreased values for the GQDs in the conjugates. These novel hybrid materials could potentially be deployed for studies in both fundamental and applied perspectives due to the synergistic contributions resulting from the combination of their excellent electronic and optical properties.
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  • Date Issued: 2017

Perceptions of parents on their involvement in the implementation of the prevention and management of learner pregnancy : a case study of three secondary schools in Amathole West District

  • Authors: Mxothwa, Smileth Ncumisa
  • Date: 2020-06
  • Subjects: Pregnant teenagers , Sex instruction for teenagers
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10353/19991 , vital:44923
  • Description: There is quite a number of researches dealing with perceptions of parents on the prevention and management of learner pregnancy. However, less has been said about how these perceptions of parents on the prevention and management are being implemented to fulfil their purpose. Discovering how these perceptions are being implemented is necessary, bearing in mind that a large number of Schools are having high learner pregnancy and are lacking parental involvement in South Africa, particularly in terms of prevention and management. This is a qualitative study that seeks to explore the perceptions of parents on their implementation of the prevention and management of the learner pregnancy policy in the three secondary school in the Amathole West Education District. The interpretivism paradigm was used by the researcher for this study. A case study design was further used to detect the participants’ lived experiences, thoughts and outlooks about the implementation of the prevention and management of learner pregnancy policy in the secondary school. The data was collected through the use of interviews and focus group. The participants were purposefully selected in the sampling of this study. The participants included School Governing Body Chairpersons. In total, the study consisted of 18 participants. The data were analysed by reducing data into themes through the process of coding. It was further shortened and organised based on evolving themes, overall ideas, and related features. The study discovered that parents are not made aware of their importance by being involved at school level and also are not involved in the implementation of the prevention and management of learner pregnancy policy in the secondary schools in the Amathole West Education District. This research revealed that there need for parental involvement be practised by all schools in the implementation of the prevention and management of learner pregnancy policy as this would help in reducing learner pregnancy in secondary schools of Amathole West Education District. Findings also showed that though parents used different strategies to prevent learner pregnancy, these were not in line with pregnancy policy. The study also discovered that there is a lack of support and monitoring from the district officials to schools. , Thesis (MEd) -- Faculty of Education, 2020
  • Full Text:
  • Date Issued: 2020-06
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