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A considerable number of Very Long Baseline Interferometry (VLBI) surveys have been conducted in the northern hemisphere and very few in the southern hemisphere mostly because of a lack of telescopes and therefore adequate baseline coverage. Thus there is a deficit of calibrator sources in the southern hemisphere. Further, some of the most interesting astronomical objects eg. the galactic centre and the nearest galaxies (the small and large Magellanic Clouds) lie in the southern hemisphere and these require high resolution studies. With a major expansion of radio astronomy observing capability on its way in the southern hemisphere (with the two SKA (Square Kilometre Array) precursors, meerKAT (Karoo Array Telescope) and ASKAP (Australian SKA Pathfinder), leading to the SKA itself) it is clear that interferometry and VLBI in the southern hemisphere need a dense network of calibration sources at different resolutions and a range of frequencies. This work seeks to help redress this problem by presenting an analysis of 31 southern sources to help fill the gaps in the southern hemisphere calibrator distribution. We have developed a multi-parameter method of classifying these sources as calibrators. From our sample of 31 sources, we have 2 class A sources (Excellent calibrators), 16 class B sources (Good calibrators), 9 class C sources (Poor calibrators) and 4 class D sources (Unsuitable calibrators).

This thesis provides a comparative analysis of vowel quality in South African English (SAE) using the following data: firstly, the existing impressionistic literature on SAE and other relevant accents of English, the former of which is subject to a critical review; secondly, acoustic data from a similar range of accents, including new SAE data, collected and instrumentally analyzed specifically for the purposes of this research. These various data are used to position, on both a descriptive and theoretical level, the SAE vowel system. In addition, and in the service of providing a careful reconstruction of the linguistic history of this variety, it offers a three-stage koin´eization model which helps, in many respects, to illuminate the respective roles played by endogenous and exogenous factors in SAE’s development. More generally, the analysis is focussed on rendering explicit the extent to which the synchronic status and diachronic development of SAE more generally, and SAE vowel quality more particularly, provides support for a number of descriptive and theoretical frameworks, including those provided in Labov (1994), Torgersen and Kerswill (2004), Trudgill (2004) and Schneider (2003; 2007). With respect to these frameworks, and based on the results of the analysis, it proposes an extension to Schneider’s (2007) Dynamic Model, shows Trudgill’s (2004) model of new-dialect formation to be inadequate in accounting for some of the SAE data, provides evidence that SAE is a possibly imminent but ‘conservative’ member of Torgersen and Kerswill’s (2004) SECS-Shift and uses SAE data to question the applicability of the SECS-Shift to FOOT-Fronting. Furthermore, this thesis provides evidence that SAE has undergone an indexicallydriven arrestment of the Diphthong and Southern Shifts and a subsequent and related diffusion of GenSAE values at the expense of BrSAE ones. Similarly, it shows that SAE’s possible participation in the SECS-Shift constitutes an effective chain-shift reversal ‘from above’. It stresses that, in order to understand such phenomena, recourse needs to be made to a theory of indexicality that takes into account the unique sociohistorical development of SAE and its speakers. Lastly, the adoption of the three-stage koin´eization model mentioned above highlights the merits of considering both endogenous and exogenous factors in the historical reconstruction of new-dialect formation and, for research into SAE in particular, strengthens the case for further investigation into the possible effects of 19th-century Afrikaans/Dutch, Yiddish and north-of-English dialects on the formation of modern SAE. / Thesis (Ph.D. (English))--North-West University, Potchefstroom Campus, 2009.

This thesis provides a comparative analysis of vowel quality in South African English (SAE) using the following data: firstly, the existing impressionistic literature on SAE and other relevant accents of English, the former of which is subject to a critical review; secondly, acoustic data from a similar range of accents, including new SAE data, collected and instrumentally analyzed specifically for the purposes of this research. These various data are used to position, on both a descriptive and theoretical level, the SAE vowel system. In addition, and in the service of providing a careful reconstruction of the linguistic history of this variety, it offers a three-stage koin´eization model which helps, in many respects, to illuminate the respective roles played by endogenous and exogenous factors in SAE’s development. More generally, the analysis is focussed on rendering explicit the extent to which the synchronic status and diachronic development of SAE more generally, and SAE vowel quality more particularly, provides support for a number of descriptive and theoretical frameworks, including those provided in Labov (1994), Torgersen and Kerswill (2004), Trudgill (2004) and Schneider (2003; 2007). With respect to these frameworks, and based on the results of the analysis, it proposes an extension to Schneider’s (2007) Dynamic Model, shows Trudgill’s (2004) model of new-dialect formation to be inadequate in accounting for some of the SAE data, provides evidence that SAE is a possibly imminent but ‘conservative’ member of Torgersen and Kerswill’s (2004) SECS-Shift and uses SAE data to question the applicability of the SECS-Shift to FOOT-Fronting. Furthermore, this thesis provides evidence that SAE has undergone an indexicallydriven arrestment of the Diphthong and Southern Shifts and a subsequent and related diffusion of GenSAE values at the expense of BrSAE ones. Similarly, it shows that SAE’s possible participation in the SECS-Shift constitutes an effective chain-shift reversal ‘from above’. It stresses that, in order to understand such phenomena, recourse needs to be made to a theory of indexicality that takes into account the unique sociohistorical development of SAE and its speakers. Lastly, the adoption of the three-stage koin´eization model mentioned above highlights the merits of considering both endogenous and exogenous factors in the historical reconstruction of new-dialect formation and, for research into SAE in particular, strengthens the case for further investigation into the possible effects of 19th-century Afrikaans/Dutch, Yiddish and north-of-English dialects on the formation of modern SAE. / Thesis (Ph.D. (English))--North-West University, Potchefstroom Campus, 2009.

This study describes the diachronic development of modality in South African English (henceforth SAfE) from the early 19th century up to its contemporary state (1820s to 1990s) in the registers of letters, news, fiction/narrative and non-fiction, on the basis of the theoretical framework of socio historical linguistics and the empirical approach of corpus linguistics. Both quantitative and qualitative analyses are conducted for modal and quasi-modal verbs, by means of the newly compiled historical corpus of SAfE and ICE-SA (with the addition of Afrikaans corpora for comparison). The study explores general frequency changes, register-internal changes and macro- and micro semantic changes, with the focus of the main semantic analysis more strongly on the obligation and necessity cluster1. A set of parameters is compiled for analysing the strength of obligation in the modals must and should, and the quasi-modal HAVE to, and is applied in the micro semantic analyses. The findings are compared with the trends for modality in other native English’s, such as American, British and Australian English (cf. e.g. Mair & Leech, 2006; Collins, 2009a; Leech, 2011), in an attempt to present a complete and comprehensive description of SAfE modality, as opposed to the traditional approach of focusing on peculiar features. It is reported that the trends of modality in SAfE correspond to those of other native varieties in some cases, but do not correspond in others. The modals of SAfE for example have declined more and the quasi-modals have increased less over the 20th century than in other native varieties of English. One particular case, in which SAfE is reported to be unique among other varieties, is the quantitative and qualitative trends for must, which has some implications for the manifestation of the democratisation process. Must in SAfE has not declined significantly over the 20th century (as it has in other native varieties) and has become less face threatening, since uses with a median (weaker) degree of force are just as frequent as those with a higher degree of force by the 1990s (unlike in other native varieties, where must has become restricted to high-degree obligative contexts). Based on socio historical, as well as linguistic evidence (on both quantitative and qualitative levels), language contact with Afrikaans is posited as the main influence for the increased use of must in contexts that are not face threatening. Extrapolating from the semantic findings, some new insights are offered regarding the phase in which SAfE finds itself within Schneider’s (2003) model of the evolution of New English’s, and some support is offered for Bekker’s (2012:143) argument that “SAfE is ...the youngest of the colonial varieties of English”, especially in the Southern Hemisphere. Ultimately, this thesis offers a piece in the larger puzzle that is SAfE, both in terms of linguistic (textual) and socio historical (contextual) aspects. / PhD (English), North-West University, Vaal Triangle Campus, 2014

This study describes the diachronic development of modality in South African English (henceforth SAfE) from the early 19th century up to its contemporary state (1820s to 1990s) in the registers of letters, news, fiction/narrative and non-fiction, on the basis of the theoretical framework of socio historical linguistics and the empirical approach of corpus linguistics. Both quantitative and qualitative analyses are conducted for modal and quasi-modal verbs, by means of the newly compiled historical corpus of SAfE and ICE-SA (with the addition of Afrikaans corpora for comparison). The study explores general frequency changes, register-internal changes and macro- and micro semantic changes, with the focus of the main semantic analysis more strongly on the obligation and necessity cluster1. A set of parameters is compiled for analysing the strength of obligation in the modals must and should, and the quasi-modal HAVE to, and is applied in the micro semantic analyses. The findings are compared with the trends for modality in other native English’s, such as American, British and Australian English (cf. e.g. Mair & Leech, 2006; Collins, 2009a; Leech, 2011), in an attempt to present a complete and comprehensive description of SAfE modality, as opposed to the traditional approach of focusing on peculiar features. It is reported that the trends of modality in SAfE correspond to those of other native varieties in some cases, but do not correspond in others. The modals of SAfE for example have declined more and the quasi-modals have increased less over the 20th century than in other native varieties of English. One particular case, in which SAfE is reported to be unique among other varieties, is the quantitative and qualitative trends for must, which has some implications for the manifestation of the democratisation process. Must in SAfE has not declined significantly over the 20th century (as it has in other native varieties) and has become less face threatening, since uses with a median (weaker) degree of force are just as frequent as those with a higher degree of force by the 1990s (unlike in other native varieties, where must has become restricted to high-degree obligative contexts). Based on socio historical, as well as linguistic evidence (on both quantitative and qualitative levels), language contact with Afrikaans is posited as the main influence for the increased use of must in contexts that are not face threatening. Extrapolating from the semantic findings, some new insights are offered regarding the phase in which SAfE finds itself within Schneider’s (2003) model of the evolution of New English’s, and some support is offered for Bekker’s (2012:143) argument that “SAfE is ...the youngest of the colonial varieties of English”, especially in the Southern Hemisphere. Ultimately, this thesis offers a piece in the larger puzzle that is SAfE, both in terms of linguistic (textual) and socio historical (contextual) aspects. / PhD (English), North-West University, Vaal Triangle Campus, 2014