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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
31

The Truth and Reconciliation Commission

Jardine, Varushka. January 2010 (has links)
Thesis (M.H.C.S. (Historical and Heritage Studies))--University of Pretoria, 2008. / Includes bibliographical references.
32

Mining and mineral industries in post-apartheid South Africa

Snyder, Kossouth, Van Rensburg, W. C. J. January 2004 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2004. / Supervisor: Willem C. J. van Rensburg. Vita. Includes bibliographical references.
33

Mining and mineral industries in post-apartheid South Africa /

Snyder, Kossouth, January 2004 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2004. / Vita. Includes bibliographical references (leaves 135-178). Available also in an electronic version from UMI Company.
34

Strike comparison of the compositional variations of the lower group and middle group chromitite seams of the critical zone, Western Bushveld complex

Doig, Heather Leslie January 2000 (has links)
The variations in the composition, specifically the Cr20 S content and the Cr:Fe ratio, and the morphology of the Lower Group (LG) and Middle Group (MG) chromitite seams of the Critical Zone (CZ) across the western Bushveld Complex, including the Ruighoek and Brits sections, is investigated by means of whole-rock chemical data, both major and trace elements analysis, XRD and electron microprobe data. As a result ofthe paucity of exposed or developed LG1 - LG5 chromitite seams in the western Bushveld Complex, this study is confined to the investigation of the compositional variations of the LG6 to MG4 chromitite seams. In only one section, the Ruighoek section, was the entire succession of chromitite seams, from the LG1 - MG4, exposed. The silicate host rocks from the LG6 pyroxenite footwall to the collar of the CC2 drillcore (lower uCZ) in the Rustenburg section were sampled. This study reviews the compositional trends of the silicate host rocks, as the compositional variations of the chromitite seams reflect the chemical evolution of the host cumulate environment and, to a lesser degree, the composition onhe interstitial mineral phases in the chromitite seams. The compositional variations of the LG and MG chromitite seams are attributed to the compositional contrast between the replenishing magma and the resident magma. The chemical trends of the LG and MG chromitite layers and the host cumUlate rOCKS do not support the existence of two compositionalfy dissimilar magmas in the CZ, rather the cyclic layering of the CZ and the chemical variations of the chromitite seams are attributed to the mixing of primitive magma with the resident magma, both of which have essentially similar compositions. The compositional variations of the LG and MG chromitite seams along strike away from the supposed feeder site (Union section) to the distal facies (Brits section) are attributed to the advanced compositional contrast between the resident magma and the replenishing primitive magma pulses. The CZ is characterized by reversals in fractionation trends and this is attributed to the compositional evolution of the parental magma and not to the replenishment of the resident magma by influxes of grossly dissimilar magma compositions. The Cr20 S content and the Cr:Fe ratio of the MG chromitite layers increase from the Ruighoek (near proximal) section to the Brits section (distal facies). This is attributed to the advanced compositional contrasts between the resident magma and the replenishing primitive magma. In contrast, the Cr20 3 content and Cr:Fe ratios ofthe LG6 and LG8a chromitite seams decreases eastwards from the Ruighoek section. The average Cr:Fe ratio for the western Bushveld Complex is between 1.5 and\2.0, nonetheless, a progressively lower Cr:Fe ratio is noted from the LG1 chromitite up through to the MG4 chromitite seam in the Ruighoek section. tn the LG2 - LG4 chromitite interval a deviation to higher.lratios is encountered. A progressive substitution of Cr by AT and Fe in the Cr-spinel crystal lattice characterizes the chromitite succession from the LG1 seam up through the chromitite succession to MG4. The petrogeneSiS of the chromitite seams of the CZ is attributed to magma mixing and fractional crystallization of a single magma type.
35

Interactions between ants, herbivorous insects and bracken (Pteridium aquilinum), a fern with extrafloral nectaries

Rashbrook, Vanessa Karin January 1989 (has links)
Bracken (Pteridium aquilinum) is a cosmopolitan species of fern which possesses extrafloral nectaries. A survey of the arthropod fauna associated with the plant throughout its range in South Africa identified the most widespread and damaging bracken herbivores and those species most likely to be influenced by ants visiting the extrafloral nectaries. Seventeen herbivorous arthropods were found to be definitely feeding on bracken and a further thirteen species with a less certain status were recorded. In addition, several species of ants were observed on the fronds and feeding at the extrafloral nectarie. On the basis of their widespread distribution and abundance, four bracken herbivores emerged as being particularly detrimental to the plant in South Africa. They were an eriophyid gall mite, a leafhopper and two moths. The biology of the two lepidopterans, Appana cinisigna and Panotima sp., suggested that they were potentially vulnerable to ants at various stages of their life histories. Laboratory experiments were undertaken to observe ant-lepidopteran interactions under controlled conditions. The ant Crematogaster peringueyi rapidly removed exposed A. cini igna eggs, but did not appear to regard Panotima eggs as food items. Small instar larvae of both species proved vulnerable, but the larger larvae appeared capable of escaping ant predation. Ant exclusion experiments in the field, using natural and artificially augmented ant densities, were carried out at two sites near Grahamstown. The dominant ant species was C. peringueyi. Neither the numbers of lepidopterans nor levels of herbivory were significantly reduced by the presence of ants . Despite the implications of the laboratory tests, the results of these field experiments did not support the hypothesis that ants which visit bracken extrafloral nectaries benefit the plant. Ant-bracken field studies on other continents also reported no significant ant-related effects, though marginal reductions in the abundance of certain herbivores have been noted at one site in the U.K. Since ant protection does not appear to be an inevitable consequence of having extrafloral nectaries, their value to bracken is in some doubt. The most likely situation where effective protection will occur is when high densities of vulnerable herbivores are preyed upon by large numbers of aggressive ants. However, even under these conditions, enhancement of plant fitness is not inevitable. This raises the question of why extrafloral nectaries have been retained in a plant that is as successful and widespread as bracken.
36

The causal link between exports and economic growth in South Africa

Tetani, Siphosethu January 2017 (has links)
Rapid economic growth has always been one of the goals of the South African government after 1994. Despite the contradicting views of the theorists, the country considered the global market as one of the gateways to accelerated economic growth. In the early 1990s South Africa opened up to foreign markets by removing trade barriers. However, the results of such actions were not entirely as expected. Different economists suggest other barriers that may be the reason behind lower levels of national output. This study examined the causal relationship between exports and economic growth in South Africa using annual data from 1970 to 2014. However, in order to achieve the main objective of this study, it was necessary to include other variables in the model as suggested by both theoretical and empirical literature. The choice of these variables was informed by an extensive review of literature on both exports and economic growth. The VECM and Granger Wild test has been utilised to capture the short run and long run dynamics of the model. The results from those tests do not approve of the Export-Led growth hypothesis and did not approve any sort relationship between exports and GDP in the short run. In the long run however, using the VECM, the study proved that exports have a positive impact on GDP. The results further suggested a negative long run relationship between consumption and economic growth. Furthermore; the results suggested that government expenditure can be detrimental to the economy in the long run. With regards to private investments, the results of this study suggest a positive relationship between investments and economic growth. Therefore, if South African government seeks to increase economic growth it needs to dedicate a considerable amount of resources in promoting local markets to expand South African exports, cut on government expenditure and attracting investment into the county.
37

The influence of gangsterism on the morale of educators on the Cape Flats, Western Cape

Dos Reis, Karen Marion January 2007 (has links)
Dissertation submitted in fulfilment of the requirements for the MAGISTER EDUCATIONIS in the Faculty of Education and Social Sciences at the Cape Peninsula University of Technology 2007 / Gangsterism affecting schools on the Cape Flats, as well as concerns about this phenomenon as addressed by the Provincial Minister of Education, Cameron Dugmore, during his Education Budget Speech in 2006, has led to widespread media attention in South Africa. Despite the Western Cape Education Department’s implementation of the Safer Schools project in 2001 to assist educators working in gang-ridden communities, not enough is being done to eradicate the problems caused by gangsterism which educators face in their schools on a daily basis. This research embarks on enquiring how gangsterism influences the morale of educators, focusing specifically on the educators’ perception of their morale and their experiences while working in gang-ridden communities. The research acknowledges that the educators play a vital role in education and are therefore regarded as key stakeholders in a community. The research is located in a qualitative paradigm because it seeks to achieve a deeper understanding of the educators’ morale disposition in gang-ridden communities and investigates the constructs of how gangsterism influences the morale of educators. Data was collected from principals and educators working in the following gangridden communities: Bonteheuwel, Manenberg, Heideveld, Hanover Park and Valhalla Park. A total of 53 respondents, including both educators and principals, participated in this research. Methods of data collection included observations, seven unstructured interviews and six structured focus group interviews. The result revealed that gangsterism does influence the morale of educators working in gang-ridden communities. It was also found that gangsterism affects the whole school community - educators, learners and parents. It is a powerful yet destructive phenomenon and has a negative effect on educator morale.
38

A sociolinguistic analysis of a multilingual community

Calteaux, Karen Vera 18 March 2014 (has links)
D.Phil. (African Languages) / This study attempts to fill a gap in the available research on language use in Black urban speech communities. Previous studies conducted in these communities, concentrated on specific language varieties. However, no attempt at describing the entire language situation in such a community had hitherto been made. A macro-level sociolinguistic description which would serve as an orientation for various detailed studies on the language varieties occurring in these communities, was therefore needed. The aim of the present study was to provide such a description. In order to achieve this, a sound theoretical framework had to be established. Phenomena such as language 'Contact, language variation and language use had to be researched and defined in order to apply to the particular situation under investigation. In .this sense, this study has succeeded in making a contribution to the theoretical debate regarding various sociolinguistic concepts, in that it has shown how these concepts apply to the South African situation. The study also investigated qualitative research methodology. The background to and implications of this methodology were discussed and analysed. A particular type of qualitative research, namely, interactive qualitative research was explored. Within this framework, a unique approach to two basic data collection techniques, namely, individual and focus group interviewing, was proposed. These techniques were used to gather the primary data for this study, and were discussed in detail. The primary data was gathered from residents of the township known as Tembisa. The secondary data was taken from studies done on individual language varieties in other Black urban speech communities. The primary data was analysed and a comprehensive qualitative description of the entire language situation in the speech community of Tembisa was given. The findings of the Tembisa study were compared with the secondary data, resulting in the identification of a number of distinct language varieties which occur in the township situations that were studied. These are: a number of Standard languages, Fanakalo (although seldom used), a Black urban vernacular, Afrikaans-based Tsotsitaal, Zulu-based Tsotsitaal, Soweto Zulu Slang, Soweto Iscamtho, Tembisa Iscamtho, English and Afrikaans. Sociolinguistic profiles of each of these language varieties were drawn up. These profiles provided clarity on the linguistic diversity in the Black urban speech communities studied and enabled the rendering of a graphic representation of the language situation in Tembisa. The above-mentioned varieties were typologised. Based on language type and language function, the study proposed a model which may be used as a framework for describing the language situation in multilingual Black urban speech communities. The study concludes with recommendations with regard to the need for linguistic analyses of the language varieties used in Black urban speech communities. The implications of the widespread use of these varieties, particularly for education, also deserve further investigation as a matter of urgency...
39

Environmental impacts of ecolabels on the tourism sector of South Africa

Arulappan, Lucinda Brown January 2017 (has links)
Submitted in full requirement for the Degree of Master of Management Sciences Specialising in Hospitality and Tourism, Durban University of Technology, Durban, South Africa, 2017. / Over the years the rapid growth of the tourism industry has revealed itself to be a major source of income and social improvement for many. However, with this growth comes the undoubtable carbon footprint it carries. As a result, the growth and expansion of many tourism ecolabels have surfaced in the hopes of alleviating the negative environmental impacts the tourism industry imposes. This study aimed to ascertain the impacts of tourism ecolabels on businesses. It assessed the level of success of the ecolabel within the organisation as well as ascertained the benefits and challenges associated with ecolabel certification. A quantitative research approach was used and the data was collected by means of online questionnaires that were targeted at managers of tourism businesses in South Africa. The study reveals that tourism businesses in South Africa do experience the benefits of being certified with an ecolabel in terms of the natural, socio-cultural and economic environments. However, the high costs associated with being certified, the lack of general public awareness regarding ecolabels and the absence of government support are still prevalent. Consequently, cost reduction, promotion of public awareness as well as government support are the main areas of improvement required by tourism establishments with regard to ecolabels. / M
40

An investigation into the potential immunogenicity of various extracts of the South African bont tick Amblyomma hebraeum

Adamson, Deborah Jane January 1993 (has links)
Rabbits and goats were inoculated with crude, membrane-associated and soluble components extracted from unengorged adult females and nymphs of the bont tick Amblyomma hebraeum. Inoculation provided some protection against nymphal infestation, however it had little effect on adult feeding. Histological examination of adults fed on inoculated hosts showed evidence of gut damage. Skin provocation testing with tick extracts elicited a Type I immediate hypersensitivity which was influenced by antihistamine. A delayed skin reaction was also evident. Whether this was attributable to Type III Arthus reaction or Type IV cell-mediated hypersensitivity was not determined. A comparative histological study of sites of tick extract injection, on inoculated and naive hosts, demonstrated the role of eosinophils in the hosts response to tick feeding. Serological examination revealed elevated anti-A hebraeum lgG titres following inoculation. These titres were found to decrease in the ten weeks after inoculation, despite the hosts being repeatedly infested with A hebraeum. Although the IgG titres of naive control hosts increased after each tick infestation, they failed to reach the titres achieved through inoculation. Western blot analysis of serum from inoculated hosts recognized most of the A. hebraeum proteins against which it was screened.

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