Photophysical studies of conjugates of upconversion nanoparticles with aluminium phthalocyanines
- Authors: Watkins, Zane
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4964 , vital:20747
- Description: NaYF4 :Yb/Er/Gd upconversion nanoparticles (UCNP) were synthesised and their photoemission stabilised by embedding these nanoparticles in electrospun fibres. The photophysical behaviour of chloro aluminium tetrasulfo-phthalocyanine chloride (ClAlTSPc) was studied in the presence of UCNPs on mixing the two species in solution. The fluorescence lifetimes for UCNPs were shortened at 658 nm in the presence of ClAlTSPc when the former was embedded in fibre and suspended in a dimethyl sulfoxide solution of the latter. A clear singlet oxygen generation by ClAlTSPc through Forster resonance energy transfer (FRET) was demonstrated using a singlet oxygen quencher, 1,3-diphenylisobenzofuran. UCNP capped with amino groups were then covalently attached to chloro aluminium tetrasulphonated phthalocyanine (ClAlTSPc) and chloro aluminium tetracarboxy phthalocyanine (ClAlTCPc). The conjugates were characterized using different techniques such as infrared spectroscopy (IR), X-ray photoelectron spectroscopy (XPS) and Transmission electron microscopy (TEM). There was a decrease in fluorescence emission spectra of the UCNPs at 658 nm in the presence of the phthalocyanines. This decrease indicates an energy transfer between the donor UCNP and conjugated accepting phthalocyanine (Pc), due to FRET. Low FRET efficiencies of 18 and 21 % for ClAlTSPc and ClAlTCPc, respectively, were obtained.
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The sedimentology and depositional model of VS5 reef at Beatrix mine and surrounding areas of the Freestate Goldfield, South Africa
- Authors: Shivambu, Steven
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4942 , vital:20745
- Description: Historically, placers of economic importance at Sibanye Gold's Beatrix No. 3 Shaft were Beatrix Reef, Aandenk Reef and Composite of the two reefs. Recently, the VS5 placer has emerged to be a significant contributor of ore tonnages mined on the Shaft as mining advances into deeper levels towards the northern portion of the mine lease area. Gold concentration in the VS5 Reef is highly variable from uneconomic, through marginal to economic gold values. A good knowledge of the sedimentological framework of the VS5 Reef was considered necessary in order to interpret the variable distribution of the gold within the VS5 placer. The aim of this study was to determine the depositional environments that played a major role during the formation of the VS5 placer by means of investigating the macroscopic sedimentological parameters of this particular reef. These sedimentological parameters were used as the basis for the subdivision of VS5 Reef into different facies recognized in the mine and surrounding areas. It was recognized that the VS5 placer was formed in a distal, braided fluvial environment by the reworking of the pre-existing Aandenk Reef by new materials containing significant amount of nondurable materials (see definition on page xii) such as shale detritus. Where there is no evidence of reworking of the older Aandenk Reef, the VS5 Reef occurs as poorly sorted, polymictic conglomerate with abundance of non-durable detritus. This is referred to as the Immature (IV) VS5 facies and occurs in the northern portion of the study area. The degree of reworking of the gravel bars by waves and current action resulted in the formation of well sorted, oligomictic conglomerates of the Beatrix facies in the southern portion of the mine. At the boundaries between the Immature VS5 and Beatrix facies occurs the Transitional (Sub-mature) VS5 facies, characterized by reef comprising a polymictic upper portion and a basal more mature oligomictic unit. The Transitional VS5 facies extends across the current central northern mining faces of Beatrix No. 3 Shaft with a northwest-southeast trend. There is a strong correlation between the VS5 lithofacies and distribution of gold mineralization. The Immature VS5 facies is poorly mineralized, with gold values averaging 200 c.m.g/t and lower. The Transitional (Sub-mature) VS5 facies has elevated gold values, ranging from 300 c.m.g/t to 1500 cm.g/t. Mineralization in this unit tend to be bottom loaded as well as at the base of each cyclic unit. The Beatrix facies records the highest grades averaging >1500 cmg/t. The improved understanding of the VS5 lithofacies made it possible to predict gold mineralization and aid planning to mine into viable VS5 areas.
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The taxation of illegal income in South Africa: the basis on which proceeds from a unilateral taking should be taxed
- Authors: Nyakanyanga, Kudzai Talent
- Date: 2017
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/5960 , vital:21002
- Description: In South Africa, income tax is levied in terms of the Income Tax Act, 58 of 1962, and the calculation of a taxpayer’s taxable income and ultimately the tax liability commences with considering what constitutes the taxpayer’s gross income. In terms of the definition of “gross income” a person can be taxed either on receipts or accruals. The definition makes no reference, however, to the legality of receipts or accruals. The main issue addressed in this thesis is the interpretation of the term “receipt” in relation to the proceeds from a unilateral taking (theft) and whether the concept of a receipt in relation to theft should be interpreted using the subjective approach used in MP Finance Group CC (In Liquidation) v C:SARS, or the objective approach. An interpretative research approach was used to provide clarity on the matter. The documentary data used for the research consists of South African tax legislation, case law, textbooks and journal articles. The thesis also analysed SARS’ view in Interpretation Note 80 that MP Finance Group CC (In Liquidation) v C:SARS is authority for a unilateral taking being a receipt, and the correctness of this viewpoint. A brief comparative analysis was done of the basis on which illegal income flowing from a unilateral taking is taxed in Australia, New Zealand and America. These countries have legislative provisions that specifically deal with how the proceeds from theft in the hands of a thief should be treated for tax purposes. The thesis concludes that, although the court in MP Finance Group CC (In Liquidation) v C:SARS shed some light on the issue of the taxability of income from illegal activities, the basis on which proceeds from theft may be taxed, as opposed to the basis on which proceeds from other illegal activities like fraud are taxed, remains a grey area in our law. The thesis recommends the introduction of a legislative provision in order to provide a more unified, consistent and effective approach when taxing all illegal income.
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A critical analysis of the taxation of financial assets and financial liabilities in terms of section 24JB of the South African Income Tax Act
- Authors: Snyman, S L
- Date: 2016
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/4178 , vital:20630
- Description: Section 24JB of the Income Tax Act No. 58 of 1962 was introduced with effect from 1 January 2014 in order to govern the taxation of financial instruments of a covered person as defined. Section 24JB represents a significant departure from the standard tax principles for financial instruments and will therefore directly affect the timing of the imposition of tax on gains and losses on these financial instruments, resulting in a significant adverse cash flow effect for the taxpayer. The main purpose of the research is to investigate the meaning of the wording in section 24JB through a critical analysis of the domestic tax legislation in the context of practical examples of specific financial assets and liabilities. The research includes an analysis of the scope of section 24JB by examining the definition of a “covered person” as well as the specific financial instruments to which the section applies, with reference to the International Financial Reporting Standards classifications and terms. The interaction of section 24JB with the rest of the Act is examined and whether this section overrides all the other provisions, specifically with reference to the taxation of dividends and the general and specific anti-avoidance provisions contained elsewhere in the Act. The study aims to highlight anomalies and possible unintended tax consequences arising from the current drafting of section 24JB using practical examples, highlighting the major areas of concern and issues of interpretation of section 24JB. Recommendations are made for amendments to the Act or the provision of guidance in the form of an Explanatory Memorandum or Interpretation Note to be issued by SARS.
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I have gone away many times
- Authors: Metileni, Moses Nzama Khaizen
- Date: 2016
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:6010 , http://hdl.handle.net/10962/d1021225
- Description: I search for beauty and for myself amidst the debris and ruin and violence, so my poems are mainly grounded narratives that combine the lyrical and the political, celebration and lament. They reconnect with nature, the now ravaged landscapes that gave me my first impulse to make songs, poetry, and art. My poems also draw on my Xitsonga culture – its folklore, proverbs, idioms, parables, and clan praise songs. Stylistically I am influenced by Mahmoud Darwish’s and Garcia Lorca’s musical structures, while Aimé Césaire has shown me how to write a long poem in both abstract and concrete registers, and Yehuda Amichai how to write with a questioning style, dislodging accepted dogma. Local influences are Mzi Mahola and James Magaisa, with their critique and celebration of culture. I pick up fragments elsewhere, as I go.
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The developmental impact of non-contributory social grants in South Africa : a study of Ezibeleni, Queenstown
- Authors: Xaba, Mzingaye Brilliant
- Date: 2015
- Subjects: Economic assistance, Domestic -- South Africa , Poor -- South Africa -- Queenstown , Poverty -- South Africa -- Queenstown , South Africa -- Economic conditions -- 1991- , South Africa -- Social conditions -- 1994-
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3402 , http://hdl.handle.net/10962/d1018919
- Description: Amartya Sen argued that poverty was the “deprivation” of the capability to lead a “good life”, therefore ending poverty meant meeting basic physical and social needs, and enabling meaningful economic and political choices. The principal objective of this research was to investigate whether (and if so, in what ways) post-apartheid state-provided non-contributory cash social grants in South Africa reduced “poverty” in Sen’s sense. This thesis used Ezibeleni, a historically black working class township at Queenstown, in the Eastern Cape, as a reference area. Using in-depth interviews, it found that social grants did help reduce poverty, both in terms of helping meet basic needs and enabling grant recipients to make more choices, including facilitating job searches and small businesses. However, it was also found that grants fall short of ending poverty, as the grants were too small to adequately cover basic needs in the context of large family sizes, a serious and long-term lack of resources, persistent unemployment, and high indebtedness, and could also enable only a limited expansion of choices. The grants played a positive role, but were inadequate to remove the “unfreedoms” facing the poor.
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The effect of strike action on the value and volatility of the South African Rand
- Authors: Gordon, Ross Patrick
- Date: 2015
- Subjects: Foreign exchange rates -- South Africa , Strikes and lockouts -- South Africa -- Economic aspects , South Africa -- Foreign economic relations , South Africa -- Economic conditions -- 1991- , Rand, South African , Dollar, American
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1124 , http://hdl.handle.net/10962/d1020018
- Description: This study analyses whether the advent of strike action has an effect on the value and volatility of the South African Rand compared with the US Dollar. The literature suggests that strike action can have a significant effect on the exchange rate in terms of either value or volatility, and consequences can result that cause inefficiencies in the economy; inhibiting employment and economic growth. Strike action has become common place in South Africa, with 2012 alone recording 99 strikes, 45 of which were “wildcat” or unprotected strikes. This study uses GARCH and Intervention Analyses to determine what the resulting effects of the strikes might be on the exchange rate. The analysis used ZAR/USD exchange rate data for the period January 2000 to October 2013, and covered 72 of the most significant strikes in terms of lost man-days. The results are mixed, suggesting that the effects of strikes do not always conform to expectations (increased volatility and a depreciation in the Rand), and that outside factors affecting the global economy may have a more significant effect on the exchange rate than strikes on their own.
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Coming clean: the treatment of traces
- Authors: Wilmot, Cassandra
- Date: 2013 , 2013-09-13
- Subjects: Salcedo, Doris, 1958- Bereavement in art
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2442 , http://hdl.handle.net/10962/d1006121
- Description: Coming Clean is a mixed media installation which aims to address and express ambivalent feelings or notions of loss arising particularly in the absence of a comprehensive narrative or history by focussing on what remains. By researching the role of indexical signs and strategies, particularly as they are deployed by the artist Doris Salcedo, I explore the capacity for these traces to not only effectively mark and memorialise loss, but to also convey the state of loss as experienced by the bereaved without providing a narrative account of the events which preceded them. The domestic ritual of washing is both alluded to and used as a metaphor in etchings, photographic prints and readymade objects to illustrate my concerns, with particular emphasis on the dialectic between what is revealed or concealed. Using representations or traces of this task of laundry to examine this dialectic between concealment and revelation, I comment on the anxiety of dealing with incomplete narrative inheritances by considering how traces of the past which impose themselves on the present may affect both remembrance and the ritual of loss, while also taking into account the complexities behind the disclosure of sensitive information in families.
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Investigating rural Ugandan women's engagement with HIV and AIDS-related programmes on community radio: a case study of Mama FM's Speak out and Listen
- Authors: Kigozi, James Musisi
- Date: 2013
- Subjects: Community radio , AIDS (Disease) in women -- Research -- Uganda , AIDS (Disease) -- Research -- Uganda , AIDS (Disease) and mass media -- Research -- Uganda , AIDS (Disease) -- Social aspects -- Uganda
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3414 , http://hdl.handle.net/10962/d1001845
- Description: The purpose of this study was to investigate how rural Ugandan women engage with discussions of HIV and AIDS on community radio. It explored how this audience may relate such broadcast discussions to their own lived experience of HIV and AIDS. It is explained in the study that, while the Uganda government has an official policy of openly discussing matters of HIV and AIDS, health communication strategies still operate within a context where there is an underlying "culture of silence" that discourages openness about sexual matters. It is also pointed out that there are widespread gender disparities among rural communities, which severely limit women's ability to make use of health communication initiatives aimed at educating them. Against this backdrop, the study sets out to explore audience responses to a particular example of Speak Out and Listen, a weekly programme broadcast on Mama FM, a Kampala-based radio station managed by the Uganda Media Women's Association (UMWA). The study maps out responses to the programme by a particular group of rural women. It is argued that these research participants' comments confirm the importance, noted in literature dealing with health education, of drawing for content on what members of an audience have to say about their own lived context. It is proposed that, despite the existence of a 'culture of silence', the women's comments demonstrate an ability to speak with confidence about their experience of living with HIV and AIDS. Thcy are able, more particularly to discuss the constraints placed by gendered power relations on women's ability to draw on the educational content of programming that targets people living with HIV and AIDS. As such, the comments that such women offer represent a valuable resource for HIV and AIDS related programming. The principal conclusion of the study is that health communication initiatives such as Speak Out and Listen would benefit from facilitating conversations with their target audience about their lived experience of HIV and AIDS, and incorporating such discussion into their programmes
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International passports : portrait of the Nigerian diaspora
- Authors: Makun, Adetoun Jones
- Date: 2012
- Subjects: Portrait painting -- South Africa Nigerians -- Portraits Portrait photography -- Nigeria
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2429 , http://hdl.handle.net/10962/d1002226
- Description: International Passports: Portraits of the Nigerian Diaspora considers notions of 'alienation‘ and 'nation-hood‘ through the lens of portraiture. This dissertation addresses issues of identity and representation in a contemporary cultural context as they pertain to the concerns presented through my current visual practice. The paintings that I have produced from 'real‘ life are primarily depictions of Nigerian individuals, friends and acquaintances (professionals and students) residing in Grahamstown, South Africa as temporary or permanent migrants. I reference the mug shot pose of identity documents and passport photographs and render them in such a way that ideas of their persona are subject to the viewer‘s gaze and deliberations, thus provoking the spectator to consider questions of 'otherness‘ and 'stereotypes‘. This provocation is subtle and complex, and in many ways I am offering the viewer a 're-looking‘, an opportunity to examine one‘s moral position and subsequent implication within the act of stereotyping an 'other‘ individual. The initial idea within this body of work was to paint images of Nigerian nationals exclusively, yet the restrictive nature of such categorization pushed me to complicate certain nationalist ideologies through the inclusion of non-Nigerian individuals. I look specifically at notions of the 'other‘ and 'strangeness‘ in a contemporary South African context and how this connects to the concept of portraiture and not simply portraiture theory but also the social theory in relation to how people are 'imaged‘. Throughout this thesis I consider several theoretical concerns in portraiture practice and discourse whilst simultaneously unpacking the psychological and social contexts that influence my practice.
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The praxis of responsible investment in South Africa: a holistic case study of Evolution One Fund
- Authors: Zaulochnaya Ya-Brouwer, Irina
- Date: 2012
- Subjects: Social responsibility of business -- South Africa Investments -- Moral and ethical aspects -- South Africa Institutional investments -- Moral and ethical aspects -- South Africa Private equity funds -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:778 , http://hdl.handle.net/10962/d1003899
- Description: At the beginning of the 21st century the public interest in environmental and social sustainability, and corporate governance grew exponentially fuelled by recurring ecological and financial crises. The market demand for cleaner production and corporate transparency created opportunities for sustainability entrepreneurs in a variety of industries, including financial markets and investment management. An increasing number of financial institutions across the world now offer ethical or socially responsible products to meet the environmental, social and governance (ESG) aspirations of their clients. In the US, according to the Social Investment Forum (SIF), responsible investment (RI) assets reached US$ 2,29 trillion in 2007 (Mitchell, 2008). The European Sustainable Investment Forum (EuroSIF) estimated that total European SRI assets reached EUR 5 trillion in 2009 (Wheelan, 2010). In June 2011 the International Finance Corporation (IFC) reported that at the end of 2010 professional sustainable investment under management in South Africa approximately equalled US$ 122,6 billion (IFC, 2011:44). The statistics describing the rapid growth in the ESG-type investments are, however, complicated by the variety of names and definitions used to describe this emerging type of investment and a general market uncertainty about what constitutes the practice of RI. The purpose of this case study is to better understand responsible investment principles and practice as seen through the eyes of a South African private equity fund, which specializes in clean technology.
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Shame is valuable
- Authors: Euvrard, Jonathan George
- Date: 2009
- Subjects: Shame Ethics Self-evaluation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2708 , http://hdl.handle.net/10962/d1002838
- Description: In this thesis I argue that shame is valuable because it contributes to the moral life by promoting coherence. I start by developing and defending a conception of shame. On my conception, rational shame involves a negative self-assessment, in which I am both the assessor and the object of assessment, and in which the standard of assessment is my own. I then develop a notion of coherence, and apply it to the relationship between values, and the relationship between values and actions. I also tie the notion of coherence to what I call “the moral life”. I then discuss two ways in which shame can work to promote coherence. Firstly, I describe a process of critical reflective self-assessment, and show how this is a particularly effective method of promoting coherence when coupled with shame. Secondly, I discuss the connection between my emotions and my values, arguing that this connection promotes coherence, and that shame works to reinforce this connection and thereby to promote coherence.
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Theatre and science, with specific reference to Shelagh Stephenson's An experiment with an air pump (1999)
- Authors: Van Niekerk, Dion
- Date: 2002
- Subjects: Science in literature , Stephenson, Shelagh -- Experiment with an air pump
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2152 , http://hdl.handle.net/10962/d1004270
- Description: Science has featured intermittently as the subject of theatrical texts since Thomas Shadwell first represented the Renaissance scientist in The Virtuoso (1676). The late twentieth century, however, saw an incremental growth in theatre's interest in scientific exploration, a growth concommitant with the vast impact that science has had on technology, warfare and the machinations of political power. The tensions generated by the disjuncture between the rationality of science and the unpredictability of human society have provided a rich source of material for theatrical investigation into the human experience. The purpose of this thesis is twofold: to reveal some of the thematic concerns that emerge in this genre, and to examine the interplay between theatre and science. Shelagh Stephenson's An Experiment with an Air Pump (1999) provides a useful point of focus for this inquiry. By parallelling two time periods, exposing the scientific objectification of women and, in addition, opening up contemporary ethics for negotiation with the audience, Stephenson calls into question the objectivity and certainty of history, gender and ethical conduct. These she presents as dynamic and evolving fields of discourse that contribute to, but do not solely constitute, knowledge and understanding of the world. An Experiment with an Air Pump also displays an awareness, through its metatheatricality, of theatre itself as an imaginative, subjective discourse which parallels the more intuitive and personal aspects of scientific exploration. The play functions as a microscope, bringing into focus a contemporary world in which traditional systems of understanding and knowledge need to be reassessed and reinvented.
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The Raven's Coloured Progressive Matrices Test: a pilot study for the establishment of normative data for Xhosa-speaking primary school pupils in the Grahamstown region
- Authors: Bass, Natalie Tanyia
- Date: 2000
- Subjects: Raven's Progressive Matrices , Students -- South Africa -- Psychology , Educational tests and measurements -- South Africa , Intelligence levels -- South Africa , Students -- Psychology
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:2930 , http://hdl.handle.net/10962/d1002439 , Raven's Progressive Matrices , Students -- South Africa -- Psychology , Educational tests and measurements -- South Africa , Intelligence levels -- South Africa , Students -- Psychology
- Description: The Raven’s Coloured Progressive Matrices (CPM) test is used extensively across a wide variety of settings in South Africa, however more appropriate local normative data has yet to be established. The CPM is internationally recognised as a culture-fair test of nonverbal intelligence, designed for use with children between the ages of 5½ and 11½. This pilot study thus sought to establish normative data for this instrument for a population of Xhosa-speaking Primary School children in the peri-urban township area in the Grahamstown region. The booklet version of the test was used and it was administered in group format and according to an alternate method of test administration (using Xhosa instructions) developed by Vass in 1992. The final normative sample consisted of 197 male and 182 female Xhosa-speaking children in Grades Two to Seven (N=379). The results showed (1) a significant effect of age on test scores, where scores increased with age as expected; (2) a consistent tendency for males to outperform females was also noted, however small sample sizes precluded any categorical claims to this effect; (3) no significant effect of education on test scores was observed and finally; (4) and finally, it appeared that the norms generated for this study revealed a tendency to be lower than those obtained by Raven, Court and Raven (1990) during the standardisation of this instrument in the United Kingdom and America. The study concluded that (1) there is an urgent need for more appropriate South African normative data for this test; and (2) that when assessing African children from disadvantaged backgrounds, further research into the effects of cultural and socio-economic factors and gender on non-verbal intelligence (and on performance on this test in particular) is required.
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The Resurrection and early eucharistic liturgy : an investigation into the influence of the Resurrection of Jesus Christ on the eucharistic liturgy of the early Christian church
- Authors: Harris, Vivian W
- Date: 1961
- Subjects: Liturgics Jesus Christ in the liturgy Lord's Supper Resurrection
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1256 , http://hdl.handle.net/10962/d1012153
- Description: The Christian Church has always found the origin of the Eucharist to be the Last Supper of our Lord Jesus Christ with His disciples. So firmly rooted has this idea of the origin of the Eucharist become that it is commonly referred to as "The Lord's Supper"- a title with obvious reference to the Last Supper. J.H. Srawley says, "The fact that Jesus suffered at the Paschal season, that He had the Passover in mind at the Supper (Luke 22 : 15) and that He had come to be thought of as 'our Passover' (I Cor. 5 : 7) would naturally lead to the conception of the solemn memorial of His death as a Christian Passover, and this influence may have affected the Synoptists' account of the actual setting of the Supper". This tradition has persisted until the present, so that it is now generally accepted that the origin of the Eucharist is the Jewish Passover. If this is true, then the Eucharist is associated chiefly with the sacrifice and death of Jesus Christ, and there are only tenuous and indirect connections with the Resurrection of the Lord. In that case, the subject of this study would need to be abandoned. If, however, there is proof that the Eucharist is closely related to the Resurrection of Jesus Christ in origin, then it is natural to look for the influence of the Resurrection on eucharistic liturgy. Cahp. 1, p. 1.
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