Georg Gruber : his contribution to music education in South Africa and an evaluation of selected vocal compositions and arrangements
- Authors: Matier, Rosemary
- Date: 1991
- Subjects: Gruber, Georg, 1904-1979 Musicians -- South Africa Music teachers -- South Africa
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2647 , http://hdl.handle.net/10962/d1002312
- Description: In this thesis I have given a factual account of Georg Gruber's contribution to music education in South Africa by giving a short biography and studying a) his philosophy of music education, b) the content of the music courses offered at Rhodes University during his occupancy of the Chair (1955-1972), c) the content of the music courses offered at the University of Fort Hare from 1974-1977, d) his contribution to choral education, e) his publications in the field of music education. I have given an evaluation of selected vocal compositions: a) Two masses, b) Terra Nova , c) Two African cantatas, i) Ukucula Ematola and ii) Izango ZakwaNtu , and seven arrangements of real folksongs from several different countries: a) Coventry Carol and Sweet Nightingale, b) Die Alibama, c) Merck tog hoe sterck, d) Entre Ie Boeuf et l'Ane gris, e) Aba Heidschi-bum-beidschi and f) Cheder Katan. Through the above study I have drawn conclusions regarding his compositional techniques prior to coming to South Africa as shown in the two mass compositions a nd the changes which occurred after being exposed to African music. The attention to detail in his arrangements and their sheer simplicity show his skill and craftsmanship also in this genre. Appendices of the works discussed have been submitted in a separate file and Appendix 8 lists all his available folksong arrangements.
- Full Text:
- Date Issued: 1991
- Authors: Matier, Rosemary
- Date: 1991
- Subjects: Gruber, Georg, 1904-1979 Musicians -- South Africa Music teachers -- South Africa
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2647 , http://hdl.handle.net/10962/d1002312
- Description: In this thesis I have given a factual account of Georg Gruber's contribution to music education in South Africa by giving a short biography and studying a) his philosophy of music education, b) the content of the music courses offered at Rhodes University during his occupancy of the Chair (1955-1972), c) the content of the music courses offered at the University of Fort Hare from 1974-1977, d) his contribution to choral education, e) his publications in the field of music education. I have given an evaluation of selected vocal compositions: a) Two masses, b) Terra Nova , c) Two African cantatas, i) Ukucula Ematola and ii) Izango ZakwaNtu , and seven arrangements of real folksongs from several different countries: a) Coventry Carol and Sweet Nightingale, b) Die Alibama, c) Merck tog hoe sterck, d) Entre Ie Boeuf et l'Ane gris, e) Aba Heidschi-bum-beidschi and f) Cheder Katan. Through the above study I have drawn conclusions regarding his compositional techniques prior to coming to South Africa as shown in the two mass compositions a nd the changes which occurred after being exposed to African music. The attention to detail in his arrangements and their sheer simplicity show his skill and craftsmanship also in this genre. Appendices of the works discussed have been submitted in a separate file and Appendix 8 lists all his available folksong arrangements.
- Full Text:
- Date Issued: 1991
Gold mineralization in an archaean granite-greenstone remnant west of Melmoth, Natal ore genesis and implications for exploration
- Authors: Bullen, Warwick David
- Date: 1991
- Subjects: Gold ores -- Geology -- South Africa , Greenstone belts -- South Africa -- KwaZulu-Natal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4967 , http://hdl.handle.net/10962/d1005579 , Gold ores -- Geology -- South Africa , Greenstone belts -- South Africa -- KwaZulu-Natal
- Description: The previously undifferentiated, "Melmoth Granite-Greenstone Remnant" (MGGR¹) crops out over an area of about 360 km² in northern Natal, South Africa. The greenstone sequence is comprised mainly of mafic metalavas with lesser serpentinite, talc schist, dacitic tuff, quartz-muscovite schist, quartzite and calc-silicate rocks. The greenstones are intruded by syntectonic trondhjemitic gneisses, late-tectonic granodioritic gneisses and post-tectonic granite dykes. Four phases of deformation and metamorphism are recognized. Epigenetic, disseminated and quartz vein-hosted gold mineralization is associated with D₂ shearing - a positive correlation existing between the intensity of the shearing, the thickness of the shear zone and the grade of ore it contains. Auriferous quartz veins are distinguished from an earlier generation of barren vein quartz on the basis of mineralogy, texture and relationship to the s-fabric. The mineralization occurs in zones of dilation associated with shear zone refraction. Associated wall rock alteration includes sericitization, argillization and chloritization. An ore genesis model based on the aforementioned parameters, is proposed. Finally, an exploration programme has been devised in order to locate undiscovered gold deposits in the MGGR. The programme could probably be applied, with minor modifications, to shear zone-hosted gold deposits in other granite-greenstone remnants in northern Natal. ¹- Name suggested by writer.
- Full Text:
- Date Issued: 1991
- Authors: Bullen, Warwick David
- Date: 1991
- Subjects: Gold ores -- Geology -- South Africa , Greenstone belts -- South Africa -- KwaZulu-Natal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4967 , http://hdl.handle.net/10962/d1005579 , Gold ores -- Geology -- South Africa , Greenstone belts -- South Africa -- KwaZulu-Natal
- Description: The previously undifferentiated, "Melmoth Granite-Greenstone Remnant" (MGGR¹) crops out over an area of about 360 km² in northern Natal, South Africa. The greenstone sequence is comprised mainly of mafic metalavas with lesser serpentinite, talc schist, dacitic tuff, quartz-muscovite schist, quartzite and calc-silicate rocks. The greenstones are intruded by syntectonic trondhjemitic gneisses, late-tectonic granodioritic gneisses and post-tectonic granite dykes. Four phases of deformation and metamorphism are recognized. Epigenetic, disseminated and quartz vein-hosted gold mineralization is associated with D₂ shearing - a positive correlation existing between the intensity of the shearing, the thickness of the shear zone and the grade of ore it contains. Auriferous quartz veins are distinguished from an earlier generation of barren vein quartz on the basis of mineralogy, texture and relationship to the s-fabric. The mineralization occurs in zones of dilation associated with shear zone refraction. Associated wall rock alteration includes sericitization, argillization and chloritization. An ore genesis model based on the aforementioned parameters, is proposed. Finally, an exploration programme has been devised in order to locate undiscovered gold deposits in the MGGR. The programme could probably be applied, with minor modifications, to shear zone-hosted gold deposits in other granite-greenstone remnants in northern Natal. ¹- Name suggested by writer.
- Full Text:
- Date Issued: 1991
History resource materials in Transkei senior secondary schools : their availability and use
- Flatela, Andile Thaddeus L L
- Authors: Flatela, Andile Thaddeus L L
- Date: 1991
- Subjects: History -- Study and teaching (Secondary) -- South Africa -- Transkei Experiential learning -- Education (Secondary) -- South Africa -- Transkei Teaching -- Methodology
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1556 , http://hdl.handle.net/10962/d1003438
- Description: This dissertation, which was motivated by high failure rate in senior secondary history, is primarily an attempt at identifying some of the possible causes for poor performance in high school history in Transkei schools. One possible cause of the weak performance was identified as outmoded teaching methods which were encouraged by lack of adequate facilities and resources for history teaching and learning. The investigation took the form of a survey of both human and material resources in 30 of the then 210 senior secondary schools in Transkei. The survey questionnaire, which was directed to history teachers, covered aspects on personal information about the teachers, material resources and facilities for teaching history, and teaching methods related to history teaching. A total of 55 teachers responded to the questionnaire. The survey included all the three senior secondary school class levels, that is standard 8, 9 and 10. By looking at the nature of history as a discipline and the way in which students learn, it was discovered that at school level history could be learnt best through the 'experiential' approach. This is mainly because in dealing with time-past as it has to, history usually comes up with 'strange' concepts which cannot be easily grasped by present-day senior secondary teenagers. This is because understanding of historical concepts tends to develop slower than would generally be expected, unless it is re-enforced. In Transkei schools this problem of concepts understanding is made worse by the foreign language medium (English) in which the subject is taught. It is felt that these constraints could be partly aleviated with the use of audio-visual aids and self-activity teaching methods. However, this study revealed a gross inadequacy not only in facilities for teaching history but also of both human and material resources. This automatically discourages the 'new history' approach and teachers (most of whom are underqualified) tend to cling to the old-style lecture-textbook method to the detriment of their students. This study suggests that to improve this situation it is essential to upgrade both pre-service and in-service teachers' academic and professional standards. In addition history facilities and audio-visual materials should be generously supplied to afford ample opportunities for pupil activity. This then would be line with modern history teaching theories and, hopefully, would improve performance in history in this region.
- Full Text:
- Date Issued: 1991
- Authors: Flatela, Andile Thaddeus L L
- Date: 1991
- Subjects: History -- Study and teaching (Secondary) -- South Africa -- Transkei Experiential learning -- Education (Secondary) -- South Africa -- Transkei Teaching -- Methodology
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1556 , http://hdl.handle.net/10962/d1003438
- Description: This dissertation, which was motivated by high failure rate in senior secondary history, is primarily an attempt at identifying some of the possible causes for poor performance in high school history in Transkei schools. One possible cause of the weak performance was identified as outmoded teaching methods which were encouraged by lack of adequate facilities and resources for history teaching and learning. The investigation took the form of a survey of both human and material resources in 30 of the then 210 senior secondary schools in Transkei. The survey questionnaire, which was directed to history teachers, covered aspects on personal information about the teachers, material resources and facilities for teaching history, and teaching methods related to history teaching. A total of 55 teachers responded to the questionnaire. The survey included all the three senior secondary school class levels, that is standard 8, 9 and 10. By looking at the nature of history as a discipline and the way in which students learn, it was discovered that at school level history could be learnt best through the 'experiential' approach. This is mainly because in dealing with time-past as it has to, history usually comes up with 'strange' concepts which cannot be easily grasped by present-day senior secondary teenagers. This is because understanding of historical concepts tends to develop slower than would generally be expected, unless it is re-enforced. In Transkei schools this problem of concepts understanding is made worse by the foreign language medium (English) in which the subject is taught. It is felt that these constraints could be partly aleviated with the use of audio-visual aids and self-activity teaching methods. However, this study revealed a gross inadequacy not only in facilities for teaching history but also of both human and material resources. This automatically discourages the 'new history' approach and teachers (most of whom are underqualified) tend to cling to the old-style lecture-textbook method to the detriment of their students. This study suggests that to improve this situation it is essential to upgrade both pre-service and in-service teachers' academic and professional standards. In addition history facilities and audio-visual materials should be generously supplied to afford ample opportunities for pupil activity. This then would be line with modern history teaching theories and, hopefully, would improve performance in history in this region.
- Full Text:
- Date Issued: 1991
Immigrant adaptation in South Africa
- Authors: Couper, Michael Patrick
- Date: 1991
- Subjects: Immigrants -- South Africa South Africa -- Emigration and immigration -- Social aspects
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3330 , http://hdl.handle.net/10962/d1003118
- Description: Although the immigrant flow to South Africa has been relatively small compared to that of other immigrant receiving countries, when considered in terms of the size of South Africa's population and the fact that immigrants are restricted to the White population group, the role of immigrants in this society is considerable. Despite this, few comprehensive studies of the experiences of immigrants in South Africa have been attempted. The aim of this study is to examine the adaptation of immigrants from various countries according to a number of dimensions. Adaptation is conceived of as a dynamic and multidimensional process. A mail survey of seven immigrant groups in South Africa was undertaken during 1985. A total of 3,520 completed questionnaires were obtained from respondents representing British, German, Dutch, Italian, Portuguese, British African and Portuguese African immigrants. The relationships among dimensions of subjective adaptation (satisfaction, identification and acceptance) and objective adaptation (social, cultural, economic, religious and political adaptation) are examined. The role of settlement and citizenship intentions are also investigated, as are various factors (country of origin, length of residence, etc.) that affect immigrant adaptation in South Africa. Multivariate analyses are undertaken to explore the nature of the relationships among these variables. Following these analyses a model of immigrant adaptation in South Africa is proposed. This model is intended to serve as a framework to guide future research on the adaptation of immigrants in South Africa.
- Full Text:
- Date Issued: 1991
- Authors: Couper, Michael Patrick
- Date: 1991
- Subjects: Immigrants -- South Africa South Africa -- Emigration and immigration -- Social aspects
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3330 , http://hdl.handle.net/10962/d1003118
- Description: Although the immigrant flow to South Africa has been relatively small compared to that of other immigrant receiving countries, when considered in terms of the size of South Africa's population and the fact that immigrants are restricted to the White population group, the role of immigrants in this society is considerable. Despite this, few comprehensive studies of the experiences of immigrants in South Africa have been attempted. The aim of this study is to examine the adaptation of immigrants from various countries according to a number of dimensions. Adaptation is conceived of as a dynamic and multidimensional process. A mail survey of seven immigrant groups in South Africa was undertaken during 1985. A total of 3,520 completed questionnaires were obtained from respondents representing British, German, Dutch, Italian, Portuguese, British African and Portuguese African immigrants. The relationships among dimensions of subjective adaptation (satisfaction, identification and acceptance) and objective adaptation (social, cultural, economic, religious and political adaptation) are examined. The role of settlement and citizenship intentions are also investigated, as are various factors (country of origin, length of residence, etc.) that affect immigrant adaptation in South Africa. Multivariate analyses are undertaken to explore the nature of the relationships among these variables. Following these analyses a model of immigrant adaptation in South Africa is proposed. This model is intended to serve as a framework to guide future research on the adaptation of immigrants in South Africa.
- Full Text:
- Date Issued: 1991
Land expropriation and labour extraction under Cape colonial rule : the war of 1835 and the "emancipation" of the Fingo
- Authors: Webster, Alan Charles
- Date: 1991
- Subjects: Ayliff, John, 1797-1862 , Fingo (African people) -- History , Frontier War, 1834-1835 , Cape of Good Hope (South Africa) -- History -- 1814-1852 , Xhosa (African people) -- History , Gcaleka (African people) -- History , Bantu-speaking peoples -- Migrations , Rharhabe (African people) -- History , Historiography -- South Africa , D'Urban, Benjamin, Sir, 1777-1849 , Land tenure -- South Africa -- Cape of Good Hope , Working class -- South Africa -- Cape of Good Hope , Eminent domain -- South Africa -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2572 , http://hdl.handle.net/10962/d1002425
- Description: The interpretations of the war of 1835 and the identity of the Fingo that were presented by the English settlers, have remained the mainstays of all subsequent histories. They asserted that the war of 1835 was the fault purely of 'Kaffir' aggression, that it was controlled by Hintza, the paramount chief, and that the ensuing hostilities were justifiable colonial defence and punishment of the Africans. The arrival of the Fingo in the Colony, it was claimed, was unconnected with the war. It was alleged that the seventeen thousand Fingo brought into the Colony in May 1835 were all Natal refugees who had fled south from the devastations of Shaka and the 'mfecane', and who had then become oppressed by their Gca1eka hosts. Both of these 'histories' need to be inverted. The 'irruption' of December 1834 was not unprovoked Rharhabe aggression, but the final response to years of the advance of the Cape Colony. Large areas of Rharhabe land had been expropriated, and their cattle regularly raided. Their women and children had been seized and taken into the Colony as labourers. The attacks were carried out by only a section of the Rharhabe on specific areas in Albany. The damage caused, and stock taken, was vastly exaggerated by the colonists. The Cape Governor, D'Urban, and British troop reinforcements arrived in Albany in January, and the Rharhabe were invaded two months later. D'Urban later invaded the innocent Gcaleka, took cattle, wreaked havoc and killed Hintza after he refused to ally with the Colony. The Fingo made their appearance at this moment. They were not a homogenous group. There were four categories within the term: mission and refugee collaborators (who were given land at Peddie and had chiefs appointed), military auxiliaries, labourers, and later, destitute Rharhabe seeking employment in the Colony. Only a small minority of the total Fingo were from Natal. The majority of the Fingo appear to have been Rharhabe and Gcaleka women and children, captured by the troops during the war and distributed on farms in the eastern districts to ameliorate the chronic labour shortage. Thus, instead of the year 1835 being one of great loss for the eastern Cape, as claimed by the settler apologists, it was a catalyst to the economic development of the area. All Rharhabe land was seized, to be granted as settler farms. Well over sixty thousand Rharhabe and Gcaleka cattle were captured and distributed amongst the colonists. The security threat of the adjacent Rharhabe and the independent Gcaleka was removed. And a large colonial labour supply was ensured.
- Full Text:
- Date Issued: 1991
- Authors: Webster, Alan Charles
- Date: 1991
- Subjects: Ayliff, John, 1797-1862 , Fingo (African people) -- History , Frontier War, 1834-1835 , Cape of Good Hope (South Africa) -- History -- 1814-1852 , Xhosa (African people) -- History , Gcaleka (African people) -- History , Bantu-speaking peoples -- Migrations , Rharhabe (African people) -- History , Historiography -- South Africa , D'Urban, Benjamin, Sir, 1777-1849 , Land tenure -- South Africa -- Cape of Good Hope , Working class -- South Africa -- Cape of Good Hope , Eminent domain -- South Africa -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2572 , http://hdl.handle.net/10962/d1002425
- Description: The interpretations of the war of 1835 and the identity of the Fingo that were presented by the English settlers, have remained the mainstays of all subsequent histories. They asserted that the war of 1835 was the fault purely of 'Kaffir' aggression, that it was controlled by Hintza, the paramount chief, and that the ensuing hostilities were justifiable colonial defence and punishment of the Africans. The arrival of the Fingo in the Colony, it was claimed, was unconnected with the war. It was alleged that the seventeen thousand Fingo brought into the Colony in May 1835 were all Natal refugees who had fled south from the devastations of Shaka and the 'mfecane', and who had then become oppressed by their Gca1eka hosts. Both of these 'histories' need to be inverted. The 'irruption' of December 1834 was not unprovoked Rharhabe aggression, but the final response to years of the advance of the Cape Colony. Large areas of Rharhabe land had been expropriated, and their cattle regularly raided. Their women and children had been seized and taken into the Colony as labourers. The attacks were carried out by only a section of the Rharhabe on specific areas in Albany. The damage caused, and stock taken, was vastly exaggerated by the colonists. The Cape Governor, D'Urban, and British troop reinforcements arrived in Albany in January, and the Rharhabe were invaded two months later. D'Urban later invaded the innocent Gcaleka, took cattle, wreaked havoc and killed Hintza after he refused to ally with the Colony. The Fingo made their appearance at this moment. They were not a homogenous group. There were four categories within the term: mission and refugee collaborators (who were given land at Peddie and had chiefs appointed), military auxiliaries, labourers, and later, destitute Rharhabe seeking employment in the Colony. Only a small minority of the total Fingo were from Natal. The majority of the Fingo appear to have been Rharhabe and Gcaleka women and children, captured by the troops during the war and distributed on farms in the eastern districts to ameliorate the chronic labour shortage. Thus, instead of the year 1835 being one of great loss for the eastern Cape, as claimed by the settler apologists, it was a catalyst to the economic development of the area. All Rharhabe land was seized, to be granted as settler farms. Well over sixty thousand Rharhabe and Gcaleka cattle were captured and distributed amongst the colonists. The security threat of the adjacent Rharhabe and the independent Gcaleka was removed. And a large colonial labour supply was ensured.
- Full Text:
- Date Issued: 1991
Mantle xenoliths from the Abrahamskraal kimberlite : a craton-margin geotherm
- Authors: Nowicki, Thomas Edward
- Date: 1991
- Subjects: Kimberlite , Kimberlite -- Inclusions
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4898 , http://hdl.handle.net/10962/d1001557
- Description: The Abrahamskraal kimberlite pipe (group I) occurs approximately 5 km to the south-west of the geophysically defined margin of the Kaapvaal craton in the central Cape Province, and contains a variety of crustal and mantle xenoliths. This study focusses on xenoliths of deep-seated origin (mantle and lower-crustal), and in particular on garnet-orthopyroxene bearing assemblages which are amenable to thermobarometric techniques. Four major types of deep-seated xenolith have been identified, i.e. peridotites, dunites , eclogites, and garnet pyroxenites. The petrographic features and mineral compositions of these xenoliths are described . Pressures and temperatures of equilibration have been calculated primarily using the garnet-orthopyroxene thermometer of Harley (1984), and the Al-in-enstatite barometer of Nickel and Green (1985). The peridotites are coarse-textured (Harte, 1977), magnesium -rich rocks, and are typical examples of the common type I peridotites which generally dominate mantle xenolith suites in kimberlites. Garnet peridotite xenoliths define a geotherm which lies along a typical theoretical conductive geothermal gradient for shield areas (Pollack and Chapman, 1977), and which extends to a maximum pressure of 41 kb (~130 km). Comparison of the Abrahamskraal geotherm with that constructed for the northern Lesotho xenolith suite (calculated using the same thermobarometer couple), suggests that the lithosphere at the Namaqua /Kaapvaal boundary is not significantly thinner or hotter than that underlying the craton. Modelling of the craton boundary under the constraints provided by the Abrahamskraal geotherm, and by the distribution of diamond-bearing kimberlites in southern Africa, indicates that the Abrahamskraal kimberlite has sampled relatively thick, cool , Namaqua lithosphere. It is suggested that, in terms of diamond distribution, the age and magmatic history of the Namaqua lithosphere is of greater significance than its thickness. Two varieties of dunite occur at Abrahamskraal. Coarse-textured dunites with Mg-rich olivine compositions similar to those of the peridotitic olivines, probably originated by similar (but perhaps more extreme) processes to those which formed the peridotites. A finer-grained and relatively Fe-rich variety of dunite may represent ultramafic cumulates formed by fractionation of basic or ultrabasic magmas within the mantle. Two varieties of eclogite have been distinguished. Coarse-grained eclogites which yield relatively high temperature estimates, are believed to have originated from depths similar to those determined for the garnet peridotites, i.e. from the lower lithosphere. A distinctly finer grained variety of eclogite, yields significantly lower temperatures which may be based on frozen-in equilibria. A maximum depth of approximately 87 km (~ 27 kb) has been estimated for these xenoliths, but they may have originated from significantly shallower (possibly lower-crustal) levels. The garnet pyroxenite xenoliths are generally orthopyroxene-rich rocks which contain varying amounts of garnet (8 to 33 %) and clinopyroxene (0 to 64 %). Textural features indicate that the garnet and possibly some of the clinopyroxene has exsolved from an originally A l -rich orthopyroxene. The rocks are significantly more Fe-rich than the peridotite xenoliths, and their constituent minerals show a wide range of Mg/Mg+Fe ratios. The pressure-temperature array defined by the garnet pyroxenites is approximately isothermal, and spans a depth range from approximately 30 to 95 km. It deviates strongly (to higher temperatures) from the ambient geothermal gradient at the time of kimberlite emplacement, as inferred from the garnet peridotite xenoliths. The pressures and temperatures calculated for the garnet pyroxenites are based on mineral equilibria which are believed to have been frozen-in during cooling from an intial hightemperature (probably molten) state. Qualitative modelling of possible cooling paths in pressure-temperature-composition space, indicates that the apparent depth range displayed by the garnet pyroxenites, approximates the true depth range over which these rocks were emplaced. However, the apparent pressures calculated from core compositions are significantly lower than the true pressures at which the original rocks formed . The garnet pyroxenite xenoliths appear to represent a major, possibly Namaqua age (~1000-1400 Ma), magmatic event involving the emplacement of large amounts of mafic magma over a significant depth range in the shallow upper mantle
- Full Text:
- Date Issued: 1991
- Authors: Nowicki, Thomas Edward
- Date: 1991
- Subjects: Kimberlite , Kimberlite -- Inclusions
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4898 , http://hdl.handle.net/10962/d1001557
- Description: The Abrahamskraal kimberlite pipe (group I) occurs approximately 5 km to the south-west of the geophysically defined margin of the Kaapvaal craton in the central Cape Province, and contains a variety of crustal and mantle xenoliths. This study focusses on xenoliths of deep-seated origin (mantle and lower-crustal), and in particular on garnet-orthopyroxene bearing assemblages which are amenable to thermobarometric techniques. Four major types of deep-seated xenolith have been identified, i.e. peridotites, dunites , eclogites, and garnet pyroxenites. The petrographic features and mineral compositions of these xenoliths are described . Pressures and temperatures of equilibration have been calculated primarily using the garnet-orthopyroxene thermometer of Harley (1984), and the Al-in-enstatite barometer of Nickel and Green (1985). The peridotites are coarse-textured (Harte, 1977), magnesium -rich rocks, and are typical examples of the common type I peridotites which generally dominate mantle xenolith suites in kimberlites. Garnet peridotite xenoliths define a geotherm which lies along a typical theoretical conductive geothermal gradient for shield areas (Pollack and Chapman, 1977), and which extends to a maximum pressure of 41 kb (~130 km). Comparison of the Abrahamskraal geotherm with that constructed for the northern Lesotho xenolith suite (calculated using the same thermobarometer couple), suggests that the lithosphere at the Namaqua /Kaapvaal boundary is not significantly thinner or hotter than that underlying the craton. Modelling of the craton boundary under the constraints provided by the Abrahamskraal geotherm, and by the distribution of diamond-bearing kimberlites in southern Africa, indicates that the Abrahamskraal kimberlite has sampled relatively thick, cool , Namaqua lithosphere. It is suggested that, in terms of diamond distribution, the age and magmatic history of the Namaqua lithosphere is of greater significance than its thickness. Two varieties of dunite occur at Abrahamskraal. Coarse-textured dunites with Mg-rich olivine compositions similar to those of the peridotitic olivines, probably originated by similar (but perhaps more extreme) processes to those which formed the peridotites. A finer-grained and relatively Fe-rich variety of dunite may represent ultramafic cumulates formed by fractionation of basic or ultrabasic magmas within the mantle. Two varieties of eclogite have been distinguished. Coarse-grained eclogites which yield relatively high temperature estimates, are believed to have originated from depths similar to those determined for the garnet peridotites, i.e. from the lower lithosphere. A distinctly finer grained variety of eclogite, yields significantly lower temperatures which may be based on frozen-in equilibria. A maximum depth of approximately 87 km (~ 27 kb) has been estimated for these xenoliths, but they may have originated from significantly shallower (possibly lower-crustal) levels. The garnet pyroxenite xenoliths are generally orthopyroxene-rich rocks which contain varying amounts of garnet (8 to 33 %) and clinopyroxene (0 to 64 %). Textural features indicate that the garnet and possibly some of the clinopyroxene has exsolved from an originally A l -rich orthopyroxene. The rocks are significantly more Fe-rich than the peridotite xenoliths, and their constituent minerals show a wide range of Mg/Mg+Fe ratios. The pressure-temperature array defined by the garnet pyroxenites is approximately isothermal, and spans a depth range from approximately 30 to 95 km. It deviates strongly (to higher temperatures) from the ambient geothermal gradient at the time of kimberlite emplacement, as inferred from the garnet peridotite xenoliths. The pressures and temperatures calculated for the garnet pyroxenites are based on mineral equilibria which are believed to have been frozen-in during cooling from an intial hightemperature (probably molten) state. Qualitative modelling of possible cooling paths in pressure-temperature-composition space, indicates that the apparent depth range displayed by the garnet pyroxenites, approximates the true depth range over which these rocks were emplaced. However, the apparent pressures calculated from core compositions are significantly lower than the true pressures at which the original rocks formed . The garnet pyroxenite xenoliths appear to represent a major, possibly Namaqua age (~1000-1400 Ma), magmatic event involving the emplacement of large amounts of mafic magma over a significant depth range in the shallow upper mantle
- Full Text:
- Date Issued: 1991
Mineralogy, petrology and geochemistry of the lower and lower critical zones, Northwestern Bushveld Complex
- Authors: Teigler, Bernd
- Date: 1991
- Subjects: Mineralogy -- South Africa -- North-Western Transvaal Petrology -- South Africa -- North-Western Transvaal Geochemistry -- South Africa -- North-Western Transvaal
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4978 , http://hdl.handle.net/10962/d1005590
- Description: This study of the lower part of the Rustenburg Layered Suite in the Western Bushveld Complex is based mainly on drill core samples from three localities, which are approximately 130 km apart. The NG-sequence, situated in the northwestern sector of the complex (Union Section, R.P.M.) extends from the floor of the complex to the base of the upper Critical Zone. The sequence is ca. 1800 m thick and it comprises mainly ultramafic cumulates, namely pyroxenites, olivine pyroxenites, harzburgites and dunites. Norites and anorthos ites are present only in minor proportion. Within the upper half of the NG-sequence ten prominent chromitite layers are correlated with the LGI MG4-interval. Correlation is also established between published sequences and the two other sequences studied, located 8 km and 55 km, respectively, east of Rustenburg. Whole-rock chemical data (major and trace elements), microprobe and Sr isotope data are presented. Petrographic studies provide modal analyses and measurements of grain size. All petrographic, mineralogical and other geochemical data point to an origin of the cumulates of the NG-sequence by crystallization from liquids of the U-type lineage and derivatives thereof. No evidence is found for the involvement of parental liquids with a distinctly different composition or crystallization order (A-liquids). However, subtle compositional variations of the parental liquids are evident in slight changes of the Cr content in orthopyroxene or in variations of Sr isotope ratio. The NG-sequence is characterized by intervals with reversed fractionation trends caused by repeated influxes of pristine magma (during periods of high magmatic activity) resulting in a high degree of rejuvenation. These intervals are overlain by others with a normal fractionation trend, interpreted as cumulates formed in periods with low or no magmatic activity, in which fractional crystallization controlled bulk composition of the evolving liquid. The Lower Zone in the NG-sequence is dominated by a progressive shift towards more primitive compositions, while in the Critical Zone fractionation was the major operating process in the magma chamber. However, during deposition of the pyroxenitic lower Critical Zone several replenishment events occurred, during which fresh Cr-rich magma was emplaced. Massive chromitite layers were deposited after mixing between the newly emplaced magma and the resident residual liquid shifted bulk compositions into the primary field of chrome-spinel. Cumulus plagioclase crystallized after bulk composition of the residual liquid was driven to the orthopyroxene plagioclase cotectic by continued fractional crystallization; this occurred once in the Lower Zone, yielding a single, thin norite layer, and again in the upper Critical Zone of the NG-sequence. A facies model is proposed based on the stratigraphic and compositional variations along strike in the Western Bushveld Complex. This model explains the variations by means of the position of the sequence with regard to a feeder system. The olivine- and orthopyroxene-rich, but plagioclase-poor NG-sequence represents the proximal facies, while the SF-sequence (poor in ferromagnesian phases, but plagioclase-rich) is developed as a distal facies, close to the Brits graben.
- Full Text:
- Date Issued: 1991
- Authors: Teigler, Bernd
- Date: 1991
- Subjects: Mineralogy -- South Africa -- North-Western Transvaal Petrology -- South Africa -- North-Western Transvaal Geochemistry -- South Africa -- North-Western Transvaal
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4978 , http://hdl.handle.net/10962/d1005590
- Description: This study of the lower part of the Rustenburg Layered Suite in the Western Bushveld Complex is based mainly on drill core samples from three localities, which are approximately 130 km apart. The NG-sequence, situated in the northwestern sector of the complex (Union Section, R.P.M.) extends from the floor of the complex to the base of the upper Critical Zone. The sequence is ca. 1800 m thick and it comprises mainly ultramafic cumulates, namely pyroxenites, olivine pyroxenites, harzburgites and dunites. Norites and anorthos ites are present only in minor proportion. Within the upper half of the NG-sequence ten prominent chromitite layers are correlated with the LGI MG4-interval. Correlation is also established between published sequences and the two other sequences studied, located 8 km and 55 km, respectively, east of Rustenburg. Whole-rock chemical data (major and trace elements), microprobe and Sr isotope data are presented. Petrographic studies provide modal analyses and measurements of grain size. All petrographic, mineralogical and other geochemical data point to an origin of the cumulates of the NG-sequence by crystallization from liquids of the U-type lineage and derivatives thereof. No evidence is found for the involvement of parental liquids with a distinctly different composition or crystallization order (A-liquids). However, subtle compositional variations of the parental liquids are evident in slight changes of the Cr content in orthopyroxene or in variations of Sr isotope ratio. The NG-sequence is characterized by intervals with reversed fractionation trends caused by repeated influxes of pristine magma (during periods of high magmatic activity) resulting in a high degree of rejuvenation. These intervals are overlain by others with a normal fractionation trend, interpreted as cumulates formed in periods with low or no magmatic activity, in which fractional crystallization controlled bulk composition of the evolving liquid. The Lower Zone in the NG-sequence is dominated by a progressive shift towards more primitive compositions, while in the Critical Zone fractionation was the major operating process in the magma chamber. However, during deposition of the pyroxenitic lower Critical Zone several replenishment events occurred, during which fresh Cr-rich magma was emplaced. Massive chromitite layers were deposited after mixing between the newly emplaced magma and the resident residual liquid shifted bulk compositions into the primary field of chrome-spinel. Cumulus plagioclase crystallized after bulk composition of the residual liquid was driven to the orthopyroxene plagioclase cotectic by continued fractional crystallization; this occurred once in the Lower Zone, yielding a single, thin norite layer, and again in the upper Critical Zone of the NG-sequence. A facies model is proposed based on the stratigraphic and compositional variations along strike in the Western Bushveld Complex. This model explains the variations by means of the position of the sequence with regard to a feeder system. The olivine- and orthopyroxene-rich, but plagioclase-poor NG-sequence represents the proximal facies, while the SF-sequence (poor in ferromagnesian phases, but plagioclase-rich) is developed as a distal facies, close to the Brits graben.
- Full Text:
- Date Issued: 1991
Peter Warlock: a study of the composer through the letters to Colin Taylor between 1911 and 1929
- Authors: Smith, Barry, 1939-
- Date: 1991
- Subjects: Warlock, Peter, 1894-1930 -- Correspondence Taylor, Colin, 1881-1973 -- Correspondence Composers -- Great Britain -- Correspondence
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2657 , http://hdl.handle.net/10962/d1002323
- Description: This thesis involves a comprehensive study of the letters written by Philip Heseltine (Peter Warlock) to Colin Taylor from 1911 to 1929. Warlock first came into contact with Taylor at Eton in 1908 when he studied the piano with him as a schoolboy. Through Taylor's imaginative teaching during the next four years Warlock's interest in and understanding of music, particularly modern music, grew and matured. At the same time a strong bond of friendship developed between the two men and continued until Warlock's early death in 1930. This is clearly illustrated in the surviving 87 letters. Warlock was a great letter writer and over a thousand of them have been preserved, mostly in the British Library. His letters to Taylor have a special significance in that they were written during the entire period of his adult life, most of them during the early formative and creative years. They cover a wide range of topics including the influential friendships with the composers Frederick Delius and Bernard van Dieren, contemporary British and foreign music and his own work as a composer, writer, and scholar. They also give us many important insights into his life and personality, written as they are with rare candour and humour. In this thesis each letter has been carefully and systematically studied and the resulting information used to augment and expand the existing knowledge of Warlock's life and personality, his friendship with Taylor, his music and writings. Because of the wide field which the life and works of Peter Warlock cover, this study has been limited to subjects arising out of the correspondence with Taylor. Where necessary, additional information has been interpolated from other sources, mainly to give a sense of continuity and to explain references which might otherwise seem obscure. For a detailed study of Warlock's music readers are referred to Ian Copley's book, The Music of Peter Warlock, (Dennis Dobson, London, 1979). A definitive biography has yet to be written.
- Full Text:
- Date Issued: 1991
- Authors: Smith, Barry, 1939-
- Date: 1991
- Subjects: Warlock, Peter, 1894-1930 -- Correspondence Taylor, Colin, 1881-1973 -- Correspondence Composers -- Great Britain -- Correspondence
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2657 , http://hdl.handle.net/10962/d1002323
- Description: This thesis involves a comprehensive study of the letters written by Philip Heseltine (Peter Warlock) to Colin Taylor from 1911 to 1929. Warlock first came into contact with Taylor at Eton in 1908 when he studied the piano with him as a schoolboy. Through Taylor's imaginative teaching during the next four years Warlock's interest in and understanding of music, particularly modern music, grew and matured. At the same time a strong bond of friendship developed between the two men and continued until Warlock's early death in 1930. This is clearly illustrated in the surviving 87 letters. Warlock was a great letter writer and over a thousand of them have been preserved, mostly in the British Library. His letters to Taylor have a special significance in that they were written during the entire period of his adult life, most of them during the early formative and creative years. They cover a wide range of topics including the influential friendships with the composers Frederick Delius and Bernard van Dieren, contemporary British and foreign music and his own work as a composer, writer, and scholar. They also give us many important insights into his life and personality, written as they are with rare candour and humour. In this thesis each letter has been carefully and systematically studied and the resulting information used to augment and expand the existing knowledge of Warlock's life and personality, his friendship with Taylor, his music and writings. Because of the wide field which the life and works of Peter Warlock cover, this study has been limited to subjects arising out of the correspondence with Taylor. Where necessary, additional information has been interpolated from other sources, mainly to give a sense of continuity and to explain references which might otherwise seem obscure. For a detailed study of Warlock's music readers are referred to Ian Copley's book, The Music of Peter Warlock, (Dennis Dobson, London, 1979). A definitive biography has yet to be written.
- Full Text:
- Date Issued: 1991
Rates of return to education of blacks in South Africa
- Authors: Serumaga-Zake, Philip A
- Date: 1991
- Subjects: Black people -- Education -- South Africa -- Statistics Black people -- Employment -- South Africa -- Statistics Black people -- South Africa -- Economic conditions -- Statistics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5565 , http://hdl.handle.net/10962/d1002084
- Description: The principal objectives of this empirical study were to test the hypothesis that eduction is a major determinant of people's earnings differentials and to calculate private and social rates of return to education of blacks in South Africa excluding Transkei, Bophuthatswana, Venda and Ciskei. Basically, the data for working men and women used in the study were extracted from the 1985 current Population survey files comprising a sample representative of the black population. Lifetime earnings profiles are constructed from these data for five educational levels, namely, no schooling up to standard 1, standards 2 to 4, standards 5 to 7, standards 8 to 9 and standard 10. Schooling is assumed to account for 60% of the income differentials between these profiles, after adjustment for the differing probabilities of finding work of persons in specific age-education groups. Imputed average household outlays on schooling are taken as the private direct cost of education supplemented by estimates of per pupil spending by the various government departments responsible for black schooling for calculation of the social costs per year of primary and secondary schooling. Indirect cost in the form of imputed foregone earnings are included from standard 5 (age 15) onwards. The resulting private internal rates of return to education of males are about 16% at primary level and 24% for secondary schooling. Corresponding social rates of return are about 6% for primary and 15% for secondary education. The estimates for females indicate that between no schooling and standards 2 to 4 level, the private and social rates of return are -1% and -4% respectively, from standards 2 to 4 to standards 5 to 7 level, private returns of 12% and social returns of 4% are reported and for the remaining secondary school phases private returns of 32% and social returns of 15% are estimated. It is implied that black education is receiving minimal government financial assistance compared to those of the other population groups. The evidence of the results of the study indicates that; besides education, marital status, locational, regional and occupational variables also influence earnings differentials, the governments responsible for black education should emphasize human capital investment in relation to physical capital investment, on average more educated persons are better off than the less educated ones and with the exception of female early primary schooling, generally, it is worthwhile for an individual to undertake a certain educational programme investment
- Full Text:
- Date Issued: 1991
- Authors: Serumaga-Zake, Philip A
- Date: 1991
- Subjects: Black people -- Education -- South Africa -- Statistics Black people -- Employment -- South Africa -- Statistics Black people -- South Africa -- Economic conditions -- Statistics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5565 , http://hdl.handle.net/10962/d1002084
- Description: The principal objectives of this empirical study were to test the hypothesis that eduction is a major determinant of people's earnings differentials and to calculate private and social rates of return to education of blacks in South Africa excluding Transkei, Bophuthatswana, Venda and Ciskei. Basically, the data for working men and women used in the study were extracted from the 1985 current Population survey files comprising a sample representative of the black population. Lifetime earnings profiles are constructed from these data for five educational levels, namely, no schooling up to standard 1, standards 2 to 4, standards 5 to 7, standards 8 to 9 and standard 10. Schooling is assumed to account for 60% of the income differentials between these profiles, after adjustment for the differing probabilities of finding work of persons in specific age-education groups. Imputed average household outlays on schooling are taken as the private direct cost of education supplemented by estimates of per pupil spending by the various government departments responsible for black schooling for calculation of the social costs per year of primary and secondary schooling. Indirect cost in the form of imputed foregone earnings are included from standard 5 (age 15) onwards. The resulting private internal rates of return to education of males are about 16% at primary level and 24% for secondary schooling. Corresponding social rates of return are about 6% for primary and 15% for secondary education. The estimates for females indicate that between no schooling and standards 2 to 4 level, the private and social rates of return are -1% and -4% respectively, from standards 2 to 4 to standards 5 to 7 level, private returns of 12% and social returns of 4% are reported and for the remaining secondary school phases private returns of 32% and social returns of 15% are estimated. It is implied that black education is receiving minimal government financial assistance compared to those of the other population groups. The evidence of the results of the study indicates that; besides education, marital status, locational, regional and occupational variables also influence earnings differentials, the governments responsible for black education should emphasize human capital investment in relation to physical capital investment, on average more educated persons are better off than the less educated ones and with the exception of female early primary schooling, generally, it is worthwhile for an individual to undertake a certain educational programme investment
- Full Text:
- Date Issued: 1991
Sir Godfrey Lagden : colonial administrator
- Authors: Burton, David Raymond
- Date: 1991
- Subjects: Lagden, Godfrey Yeatman, Sir, 1851-1934 South Africa -- History -- 1836-1909
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2519 , http://hdl.handle.net/10962/d1001848
- Description: The thesis attempts to provide a chronological analysis of Lagden's colonial career between 1877 and 1907. The youngest son of a parish priest, Lagden received limited formal education and no military training. By a fortuitous set of circumstances, he was able, as a man on the spot, to attain high ranking posts in colonial administration. As a young man, he acquired considerable experience in the Transvaal, Egypt and the Gold Coast. However, blatant disobedience led to his dismissal from Colonial service. Fortunately for Lagden, Marshal Clarke, newly appointed Resident Commissioner of Basutoland, insisted on Lagden being appointed to his staff. Except for a brief stint in Swaziland, Lagden remained in Basutoland until 1900. With Clarke, Lagden played a prominent role in the implementation of the Imperial policy of securing the support of the Koena chiefs by allowing them to retain and consolidate their power and influence. Lagden became Resident Commissioner in Basutoland when Clarke was transferred to Zululand. He continued established policies and championed the Basotho cause by opposing the opening of Basutoland to prospectors and by stressing the industrious habits of the Basotho. His tactful and energetic handling of the rinderpest crisis reduced dramatic repercussions amongst the Basotho and enabled cooperative Koena chiefs to increase their economic and political leverage. Despite his reservations over Basotho loyalty, Lagden emerged from the South African War with an enhanced reputation as the Basotho remained loyal and energetically participated in the Imperial war effort. Largely because of his Basutoland experience, Lagden was appointed the Transvaal Commissioner of Native Affairs in 1901. He was responsible for regulating African labour supplies for the mines and delineation of African locations. His failure to procure sufficient labour and his defence of African rights earned Lagden much abusive settler condemnation. As chairman of the South African Native Affairs Commission, Lagden produced an uninspiring report conditioned by the labour shortage and his personal distaste for decisive action. Nevertheless, its advocacy of political and territorial segregation influenced successive Union governments.
- Full Text:
- Date Issued: 1991
- Authors: Burton, David Raymond
- Date: 1991
- Subjects: Lagden, Godfrey Yeatman, Sir, 1851-1934 South Africa -- History -- 1836-1909
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2519 , http://hdl.handle.net/10962/d1001848
- Description: The thesis attempts to provide a chronological analysis of Lagden's colonial career between 1877 and 1907. The youngest son of a parish priest, Lagden received limited formal education and no military training. By a fortuitous set of circumstances, he was able, as a man on the spot, to attain high ranking posts in colonial administration. As a young man, he acquired considerable experience in the Transvaal, Egypt and the Gold Coast. However, blatant disobedience led to his dismissal from Colonial service. Fortunately for Lagden, Marshal Clarke, newly appointed Resident Commissioner of Basutoland, insisted on Lagden being appointed to his staff. Except for a brief stint in Swaziland, Lagden remained in Basutoland until 1900. With Clarke, Lagden played a prominent role in the implementation of the Imperial policy of securing the support of the Koena chiefs by allowing them to retain and consolidate their power and influence. Lagden became Resident Commissioner in Basutoland when Clarke was transferred to Zululand. He continued established policies and championed the Basotho cause by opposing the opening of Basutoland to prospectors and by stressing the industrious habits of the Basotho. His tactful and energetic handling of the rinderpest crisis reduced dramatic repercussions amongst the Basotho and enabled cooperative Koena chiefs to increase their economic and political leverage. Despite his reservations over Basotho loyalty, Lagden emerged from the South African War with an enhanced reputation as the Basotho remained loyal and energetically participated in the Imperial war effort. Largely because of his Basutoland experience, Lagden was appointed the Transvaal Commissioner of Native Affairs in 1901. He was responsible for regulating African labour supplies for the mines and delineation of African locations. His failure to procure sufficient labour and his defence of African rights earned Lagden much abusive settler condemnation. As chairman of the South African Native Affairs Commission, Lagden produced an uninspiring report conditioned by the labour shortage and his personal distaste for decisive action. Nevertheless, its advocacy of political and territorial segregation influenced successive Union governments.
- Full Text:
- Date Issued: 1991
South African anti-apartheid documentaries 1977-1987: some theoretical excursions
- Authors: Steenveld, Lynette Noreen
- Date: 1991
- Subjects: Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3484 , http://hdl.handle.net/10962/d1002939 , Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Description: This study examines anti-apartheid documentary production in South Africa between 1977 and 1987. These documentaries were produced by a variety of producers in order to record aspects of South Africa's contemporary social history, and as a means of contributing - in some way - to changing the conditions described. While the 'content' of the documentaries is historical and social, and their intention political, this study is aimed at elucidating how a documentary, as a representational system, produces meaning. The study is therefore located within the discourse of film studies. My study is based on the theory that a documentary is the embodiment of several relationships: the relationship between social reality and documentary producers; the social relationships engaged in, in the production of the text; the relationship between the text and its audience 1, and the relationship between the audience and its social context. This informs my methodological approach in which analysis appropriate to each area of study is used. Using secondary sources obtained through standard library research, I pursue social and historical analysis of the 1970s and 1980s in order to contextualise both the producers of the documentaries, and their audience. The social relations of production of a text are examined using material gathered through extensive interviews with the producers and published secondary material. How this impinges on the documentary is ascertained through detailed textual analysis of 30 documentaries. For analytical clarity each chapter focuses on a specific aspect of documentary - although I do show how the various relationships impinge on each other. This research finds that the documentaries faithfully reflect the anti-apartheid ideology dominant in the extra-parliamentary opposition in the period under discussion - to the extent that all forms of consciousness are framed by this discourse. An examination of the textual strategies used shows that they are bound by the conventions of broadcast television. They therefore construct a spectator-text relationship which is not consistent with the political concern that democratic relationships be established as the basis of a post-apartheid society. In other words, there is an inconsistency between the ideology espoused, and the way in which film- and videomakers, in their specialised field of production, practise their politics. This can be attributed to the over-riding political intention of the documentarists 'to record' what is happening, and to establish a popular archive which can be used by extra-parliamentary opposition groups in their struggle against apartheid.
- Full Text:
- Date Issued: 1991
- Authors: Steenveld, Lynette Noreen
- Date: 1991
- Subjects: Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3484 , http://hdl.handle.net/10962/d1002939 , Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Description: This study examines anti-apartheid documentary production in South Africa between 1977 and 1987. These documentaries were produced by a variety of producers in order to record aspects of South Africa's contemporary social history, and as a means of contributing - in some way - to changing the conditions described. While the 'content' of the documentaries is historical and social, and their intention political, this study is aimed at elucidating how a documentary, as a representational system, produces meaning. The study is therefore located within the discourse of film studies. My study is based on the theory that a documentary is the embodiment of several relationships: the relationship between social reality and documentary producers; the social relationships engaged in, in the production of the text; the relationship between the text and its audience 1, and the relationship between the audience and its social context. This informs my methodological approach in which analysis appropriate to each area of study is used. Using secondary sources obtained through standard library research, I pursue social and historical analysis of the 1970s and 1980s in order to contextualise both the producers of the documentaries, and their audience. The social relations of production of a text are examined using material gathered through extensive interviews with the producers and published secondary material. How this impinges on the documentary is ascertained through detailed textual analysis of 30 documentaries. For analytical clarity each chapter focuses on a specific aspect of documentary - although I do show how the various relationships impinge on each other. This research finds that the documentaries faithfully reflect the anti-apartheid ideology dominant in the extra-parliamentary opposition in the period under discussion - to the extent that all forms of consciousness are framed by this discourse. An examination of the textual strategies used shows that they are bound by the conventions of broadcast television. They therefore construct a spectator-text relationship which is not consistent with the political concern that democratic relationships be established as the basis of a post-apartheid society. In other words, there is an inconsistency between the ideology espoused, and the way in which film- and videomakers, in their specialised field of production, practise their politics. This can be attributed to the over-riding political intention of the documentarists 'to record' what is happening, and to establish a popular archive which can be used by extra-parliamentary opposition groups in their struggle against apartheid.
- Full Text:
- Date Issued: 1991
Structural studies on the capsular antigens of Escherichia coli serotypes K102 and K47
- Authors: De Bruin, Aletta Hester
- Date: 1991
- Subjects: Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3754 , http://hdl.handle.net/10962/d1003232 , Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Description: The work presented in this thesis forms part of a continuing programme concerned with the structural determination of capsular polysaccharides of some Enterobacteriaceae. Since bacteria of this family are pathogenic to Man, work in this laboratory has focused on the structural elucidation of Klebsiella and, more recently, Escherichia coli ( E. coli) capsular polysaccharides ( K-antigens ). To date, some 74 K-antigens have been distinguished serologically within the genus E. coli and the structures of approximately 70% are known. In general, the K-antigens of the E. coli are characterized by a wide variety of constituent monosaccharides arranged in repeating units. In this thesis the structural elucidation of the capsular polysaccharides of E. coli serotypes 08: KI02: H- and 08: K47: H2 is presented. A variety of chemical techniques has been employed in the structural analysis, and are discussed. The thesis also includes extensive two-dimensional n.m.r. studies on the E. coli KI02 and K47 polysaccharides, as well as on a modified KI02 polymer produced after a lithium-ethylenediamine degradation of the native polysaccharide.
- Full Text:
- Date Issued: 1991
- Authors: De Bruin, Aletta Hester
- Date: 1991
- Subjects: Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3754 , http://hdl.handle.net/10962/d1003232 , Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Description: The work presented in this thesis forms part of a continuing programme concerned with the structural determination of capsular polysaccharides of some Enterobacteriaceae. Since bacteria of this family are pathogenic to Man, work in this laboratory has focused on the structural elucidation of Klebsiella and, more recently, Escherichia coli ( E. coli) capsular polysaccharides ( K-antigens ). To date, some 74 K-antigens have been distinguished serologically within the genus E. coli and the structures of approximately 70% are known. In general, the K-antigens of the E. coli are characterized by a wide variety of constituent monosaccharides arranged in repeating units. In this thesis the structural elucidation of the capsular polysaccharides of E. coli serotypes 08: KI02: H- and 08: K47: H2 is presented. A variety of chemical techniques has been employed in the structural analysis, and are discussed. The thesis also includes extensive two-dimensional n.m.r. studies on the E. coli KI02 and K47 polysaccharides, as well as on a modified KI02 polymer produced after a lithium-ethylenediamine degradation of the native polysaccharide.
- Full Text:
- Date Issued: 1991
Studies in asymmetric synthesis
- Authors: Learmonth, Robin Alec
- Date: 1991
- Subjects: Organic compounds -- Synthesis Stereochemistry Organosilicon compounds Chirality Chemical tests and reagents
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4353 , http://hdl.handle.net/10962/d1005018
- Description: The concept of combining two well established areas of organic chemistry, viz., organosilicon chemistry and the use of chiral auxiliaries, into a viable, alternative method of asymmetric synthesis has only very recently begun to receive attention. At the outset of this investigation, no asymmetric reactions of silyl enol ethers, chiral by virtue of optically active substituents on the silicon, had been reported. A range of novel chiral silyl enol ethers have thus been prepared from a variety of ketones, including pinacolone, cyclohexanone, and α-tetralone, and employing menthol, borneol, and cholesterol as chiral auxiliaries. These preparations have been achieved via several distinct routes, including a novel convergent approach involving the isolation of either the chloro(menthyloxy)dimethylsilane or the (bornyloxy)chlorodimethylsilane. The MS and NMR spectra of these silyl enol ethers were examined in detail and, in the case of the crystalline cholesteryloxy silyl enol ether, the X-ray structure has been determined. The potential of chloroalkoxysilanes to act as general, chiral derivatizing agents has been established by the preparation of diastereomeric silyl acetal mixtures of racemic secondary alcohols (e.g. I-phenylethanol and 2-octanol). The experimental diastereomeric ratios, obtained by GLC and ¹H NMR spectroscopy, approached the expected value of unity, confirming the potential of the alkoxychlorosilanes as chiral probes. The chiral silyl enol ethers have been successfully oxidized to the corresponding α-siloxy ketones employing MCPBA, MMPP, and 2-(phenylsulphonyl)-3-phenyloxaziridine as oxidizing agents and the diastereomeric excesses obtained, which varied from 0 to 16%, indicated some potential for stereochemical control. Alkylation and hydroxyalkylation reactions of the silyl enol ethers have yielded the expected α-iert-butyl and β-hydroxy ketones in good to excellent material yields, with the enantiomeric excesses, as determined by chiral shift reagent studies, reaching 14%. To improve the stereo control in these reactions, attempts have been made to prepare chiral silyl enol ethers with auxiliaries possessing the potential for transition state complex co-ordination in the reactions under consideration. The preparation of such silyl enol ethers, incorporating the proline-derived auxiliaries, N-methyl-2-hydroxymethylpyrrolidine and 2-methoxymethylpyrrolidine met with only limited success. In an alternative approach, three derivatives of 2,3-dihydroxybornane have been prepared. However, two of these auxiliaries, viz., 3-exo-benzyloxy-2-exo-hydroxybornane and 3-exo-(1-methoxyethoxy)-2-exo-hydroxybornane failed to form silyl enol ethers, even under considerably more vigorous conditions than normally employed. The third derivative, 3,3-ethylenedioxy-2-hydroxybornane has been successfully utilized in the preparation of a pinacolone-derived chiral silyl enol ether. Hydroxyalkylation of this compound with benzaldehyde has yielded the β-hydroxyketone with significantly improved enantiomeric excess (26%) and a transition state complex has been proposed to rationalize this improvement.
- Full Text:
- Date Issued: 1991
- Authors: Learmonth, Robin Alec
- Date: 1991
- Subjects: Organic compounds -- Synthesis Stereochemistry Organosilicon compounds Chirality Chemical tests and reagents
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4353 , http://hdl.handle.net/10962/d1005018
- Description: The concept of combining two well established areas of organic chemistry, viz., organosilicon chemistry and the use of chiral auxiliaries, into a viable, alternative method of asymmetric synthesis has only very recently begun to receive attention. At the outset of this investigation, no asymmetric reactions of silyl enol ethers, chiral by virtue of optically active substituents on the silicon, had been reported. A range of novel chiral silyl enol ethers have thus been prepared from a variety of ketones, including pinacolone, cyclohexanone, and α-tetralone, and employing menthol, borneol, and cholesterol as chiral auxiliaries. These preparations have been achieved via several distinct routes, including a novel convergent approach involving the isolation of either the chloro(menthyloxy)dimethylsilane or the (bornyloxy)chlorodimethylsilane. The MS and NMR spectra of these silyl enol ethers were examined in detail and, in the case of the crystalline cholesteryloxy silyl enol ether, the X-ray structure has been determined. The potential of chloroalkoxysilanes to act as general, chiral derivatizing agents has been established by the preparation of diastereomeric silyl acetal mixtures of racemic secondary alcohols (e.g. I-phenylethanol and 2-octanol). The experimental diastereomeric ratios, obtained by GLC and ¹H NMR spectroscopy, approached the expected value of unity, confirming the potential of the alkoxychlorosilanes as chiral probes. The chiral silyl enol ethers have been successfully oxidized to the corresponding α-siloxy ketones employing MCPBA, MMPP, and 2-(phenylsulphonyl)-3-phenyloxaziridine as oxidizing agents and the diastereomeric excesses obtained, which varied from 0 to 16%, indicated some potential for stereochemical control. Alkylation and hydroxyalkylation reactions of the silyl enol ethers have yielded the expected α-iert-butyl and β-hydroxy ketones in good to excellent material yields, with the enantiomeric excesses, as determined by chiral shift reagent studies, reaching 14%. To improve the stereo control in these reactions, attempts have been made to prepare chiral silyl enol ethers with auxiliaries possessing the potential for transition state complex co-ordination in the reactions under consideration. The preparation of such silyl enol ethers, incorporating the proline-derived auxiliaries, N-methyl-2-hydroxymethylpyrrolidine and 2-methoxymethylpyrrolidine met with only limited success. In an alternative approach, three derivatives of 2,3-dihydroxybornane have been prepared. However, two of these auxiliaries, viz., 3-exo-benzyloxy-2-exo-hydroxybornane and 3-exo-(1-methoxyethoxy)-2-exo-hydroxybornane failed to form silyl enol ethers, even under considerably more vigorous conditions than normally employed. The third derivative, 3,3-ethylenedioxy-2-hydroxybornane has been successfully utilized in the preparation of a pinacolone-derived chiral silyl enol ether. Hydroxyalkylation of this compound with benzaldehyde has yielded the β-hydroxyketone with significantly improved enantiomeric excess (26%) and a transition state complex has been proposed to rationalize this improvement.
- Full Text:
- Date Issued: 1991
Synthesis and interaction of secondary N-nitrosamines with acetylcholinesterase
- Authors: Mmutle, Tsietso Bernard
- Date: 1991
- Subjects: Chemistry, Physical and theoretical , Enzyme kinetics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4058 , http://hdl.handle.net/10962/d1004119 , Chemistry, Physical and theoretical , Enzyme kinetics
- Description: Secondary N-nitrosamines: diphenylnitrosamine (DPhNA), dimethylnitrosamine (DMNA), diethylnitrosamine (DENA), dipropylnitrosamine (DPNA), dibutylnitrosamine (DBNA), diethanolnitrosamine (DEtNA), methylnitrosoglycine (MNGly), nitrosopyrrolidine (NPyr), nitrosomorpholine (NMor) and nitrosopiperidine (NPip) were synthesised and their interaction with acetylcholinesterase (AChE) was investigated. Analyses of kinetic results show that DMNA (Ki=34.78 μM); DENA (Ki=54.24 μM); DPNA(Ki=60.36 μM); DBNA(Ki=95.54 μM); DEtNA(Ki=43.68 μM)MNGly (Ki=30.18 μM); NPip (Ki=123 μM); NPyr (Ki=66.07 μM), NMor (Ki=73.93 μM) and DPhNA (Ki=20.32 μM) are competitive and reversible inhibitors of acetylcholinesterase, with respect to the substrate, acetylthiocholine chloride, ATChCl. With time they act as irreversible covalent inhibitors with dipropy1nitrosamine producing 72% inactivation after 60 minutes. Scatchard analyses of f1uorometric titrations, (Kd=0.75mM-4.09mM); gel chromatography (Kd=O. 80mM-4. 60mM) and equilibrium dia1ysis (Kd=O. 71mM- 4.21mM) for MNG1y, DMNA, DEtNA, DENA, DPNA, NPyr, DSNA, NMor and NPip show that these compounds have weaker affinity for the enzyme, as compared to the much tightly binding aromatic DPhNA, Kd values (0.65mM, 0.68mM and 0.68mM) for fluorometric experiments, gel chromatography and equilibrium dialysis respectively. In all cases, the number of binding sites of acetylcholinesterase averaged to four.
- Full Text:
- Date Issued: 1991
- Authors: Mmutle, Tsietso Bernard
- Date: 1991
- Subjects: Chemistry, Physical and theoretical , Enzyme kinetics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4058 , http://hdl.handle.net/10962/d1004119 , Chemistry, Physical and theoretical , Enzyme kinetics
- Description: Secondary N-nitrosamines: diphenylnitrosamine (DPhNA), dimethylnitrosamine (DMNA), diethylnitrosamine (DENA), dipropylnitrosamine (DPNA), dibutylnitrosamine (DBNA), diethanolnitrosamine (DEtNA), methylnitrosoglycine (MNGly), nitrosopyrrolidine (NPyr), nitrosomorpholine (NMor) and nitrosopiperidine (NPip) were synthesised and their interaction with acetylcholinesterase (AChE) was investigated. Analyses of kinetic results show that DMNA (Ki=34.78 μM); DENA (Ki=54.24 μM); DPNA(Ki=60.36 μM); DBNA(Ki=95.54 μM); DEtNA(Ki=43.68 μM)MNGly (Ki=30.18 μM); NPip (Ki=123 μM); NPyr (Ki=66.07 μM), NMor (Ki=73.93 μM) and DPhNA (Ki=20.32 μM) are competitive and reversible inhibitors of acetylcholinesterase, with respect to the substrate, acetylthiocholine chloride, ATChCl. With time they act as irreversible covalent inhibitors with dipropy1nitrosamine producing 72% inactivation after 60 minutes. Scatchard analyses of f1uorometric titrations, (Kd=0.75mM-4.09mM); gel chromatography (Kd=O. 80mM-4. 60mM) and equilibrium dia1ysis (Kd=O. 71mM- 4.21mM) for MNG1y, DMNA, DEtNA, DENA, DPNA, NPyr, DSNA, NMor and NPip show that these compounds have weaker affinity for the enzyme, as compared to the much tightly binding aromatic DPhNA, Kd values (0.65mM, 0.68mM and 0.68mM) for fluorometric experiments, gel chromatography and equilibrium dialysis respectively. In all cases, the number of binding sites of acetylcholinesterase averaged to four.
- Full Text:
- Date Issued: 1991
The alluvial diamond deposits of the lower Vaal river between Barkly West and the Vaal-Harts confluence in the Northern Cape province, South Africa
- Authors: Matheys, Fabrice Gilbert
- Date: 1991
- Subjects: Diamond deposits -- South Africa , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4933 , http://hdl.handle.net/10962/d1005545 , Diamond deposits -- South Africa , Geology, Economic
- Description: The alluvial diamond deposits along the Vaal River, between Barkly West and the Vaal-Harts confluence, have been worked for more than one century by thousands of private diggers. The diamonds are recovered from two sedimentary units of Cenozoic age, the Older Gravels and the Younger Gravels. These rest on a basement of Ventersdorp Supergroup andesites and Karoo Sequence sediments, which have been intruded by Cretaceous kimberlites. The gravels are, in turn, overlain by the Riverton Formation and the Hutton Sand. On a large scale, tectonic setting, geomorphology and palaeoclimate have played a major role in the formation of diamondiferous placers in the area under investigation. A study of the sedimentology of the Younger Gravels was carried out with the aim of acquiring an understanding of the processes responsible for the economic concentration of high quality diamonds. An investigation of facies assemblages, clast composition, clast size, palaeocurrent directions external geometry, particle morphology and led to the conclusion that the Younger Gravels were deposited in a proximal braided stream environment during high discharge. A small-scale experiment was carried out to test the efficiency of different sedimentological trap sites in concentrating kimberlite indicator minerals. The results show that the concentration of indicator minerals is dependent on the size fraction chosen, bed roughness and gravel calibre. The examination of surface features on pyrope, picroilmenite and chrome diopside from kimberlite led to the conclusion that most of these minerals are locally derived. Diamond grade variations within the Younger Gravels are influenced by a combination of factors, including bed roughness, channel width and sorting process from the source. Alluvial diamond exploration programmes must take into account the tectonic setting, the palaeoclimate, the level of erosion, the stability of the drainage system in the area as well as the presence of local trap sites in the river profile. It is concluded that the diamonds are the product of a long and complex process of erosion, reworking and concentration and are derived from Cretaceous kimberlites in the area.
- Full Text:
- Date Issued: 1991
- Authors: Matheys, Fabrice Gilbert
- Date: 1991
- Subjects: Diamond deposits -- South Africa , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4933 , http://hdl.handle.net/10962/d1005545 , Diamond deposits -- South Africa , Geology, Economic
- Description: The alluvial diamond deposits along the Vaal River, between Barkly West and the Vaal-Harts confluence, have been worked for more than one century by thousands of private diggers. The diamonds are recovered from two sedimentary units of Cenozoic age, the Older Gravels and the Younger Gravels. These rest on a basement of Ventersdorp Supergroup andesites and Karoo Sequence sediments, which have been intruded by Cretaceous kimberlites. The gravels are, in turn, overlain by the Riverton Formation and the Hutton Sand. On a large scale, tectonic setting, geomorphology and palaeoclimate have played a major role in the formation of diamondiferous placers in the area under investigation. A study of the sedimentology of the Younger Gravels was carried out with the aim of acquiring an understanding of the processes responsible for the economic concentration of high quality diamonds. An investigation of facies assemblages, clast composition, clast size, palaeocurrent directions external geometry, particle morphology and led to the conclusion that the Younger Gravels were deposited in a proximal braided stream environment during high discharge. A small-scale experiment was carried out to test the efficiency of different sedimentological trap sites in concentrating kimberlite indicator minerals. The results show that the concentration of indicator minerals is dependent on the size fraction chosen, bed roughness and gravel calibre. The examination of surface features on pyrope, picroilmenite and chrome diopside from kimberlite led to the conclusion that most of these minerals are locally derived. Diamond grade variations within the Younger Gravels are influenced by a combination of factors, including bed roughness, channel width and sorting process from the source. Alluvial diamond exploration programmes must take into account the tectonic setting, the palaeoclimate, the level of erosion, the stability of the drainage system in the area as well as the presence of local trap sites in the river profile. It is concluded that the diamonds are the product of a long and complex process of erosion, reworking and concentration and are derived from Cretaceous kimberlites in the area.
- Full Text:
- Date Issued: 1991
The computer in secondary school mathematics : an analysis and classification of possible modes of application, with suggested implications for the mathematics curriculum in South Africa
- Authors: Marsh, Terence Anthony
- Date: 1991
- Subjects: Mathematics -- Computer-assisted instruction Mathematics -- Study and teaching (Secondary) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1459 , http://hdl.handle.net/10962/d1003340
- Description: There is a variety of possible ways in which computers can be used to enhance mathematics education. This thesis attempts to identify, analyse and classify these possibilities, particularly at the secondary school level. It describes and exemplifies applications ranging from drill-and-practice through games and simulations to problem solving by computer programming. Software evaluation procedures are considered in some depth. Illuminative evaluations of various items of software and there classroom use are reported. The underlying methodology is small-scale action research. Insights gained during the process of investigating each class of software lead to the eventual formulation of a scheme for classifying mathematics education software by means of 'multidimensional attributes'. It is contended that this scheme will help mathematics teachers to make well informed and sound professional judgements regarding the evaluation and use of computer programs for teaching/learning purposes. Also, it is hoped that this scheme and the thesis as a whole will contribute towards the establishment of well founded standards and procedures for software development in the field of mathematics education. Several implications of the computer for the mathematics curriculum in South Africa are suggested. A note of caution is sounded regarding possible detrimental effects of the computer and several questions requiring further research are posed. A recommendation arising from the thesis is that in-service training courses concerning computer applications in mathematics education should be run for secondary school teachers.
- Full Text:
- Date Issued: 1991
- Authors: Marsh, Terence Anthony
- Date: 1991
- Subjects: Mathematics -- Computer-assisted instruction Mathematics -- Study and teaching (Secondary) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1459 , http://hdl.handle.net/10962/d1003340
- Description: There is a variety of possible ways in which computers can be used to enhance mathematics education. This thesis attempts to identify, analyse and classify these possibilities, particularly at the secondary school level. It describes and exemplifies applications ranging from drill-and-practice through games and simulations to problem solving by computer programming. Software evaluation procedures are considered in some depth. Illuminative evaluations of various items of software and there classroom use are reported. The underlying methodology is small-scale action research. Insights gained during the process of investigating each class of software lead to the eventual formulation of a scheme for classifying mathematics education software by means of 'multidimensional attributes'. It is contended that this scheme will help mathematics teachers to make well informed and sound professional judgements regarding the evaluation and use of computer programs for teaching/learning purposes. Also, it is hoped that this scheme and the thesis as a whole will contribute towards the establishment of well founded standards and procedures for software development in the field of mathematics education. Several implications of the computer for the mathematics curriculum in South Africa are suggested. A note of caution is sounded regarding possible detrimental effects of the computer and several questions requiring further research are posed. A recommendation arising from the thesis is that in-service training courses concerning computer applications in mathematics education should be run for secondary school teachers.
- Full Text:
- Date Issued: 1991
The contribution of meditative experiences to personal growth : a case study
- Authors: Knight, Zelda Gillian
- Date: 1991
- Subjects: Meditation Self-actualization (Psychology)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1466 , http://hdl.handle.net/10962/d1003347
- Description: A three month meditation programme based on Joseph Goldstein's (1976) instructions and discourses given at a Vipassana meditation retreat was implemented among four 17 year old white English-speaking school girls at a private non-racial co-educational high school in South Africa. The meditation experiences of all four subjects were noted, hut only one subject's meditative experiences were documented and used as a case study to explore their use as a tool for personal growth within the framework of ego-psychology and transpersonal psychology. It is concluded that the subject, who meditated on a daily basis, experienced personal growth primarily from the ego-psychology perspective and, it is interesting to note, less so from the transpersonal perspective. Three bypotheses have been put forward for this. Firstly, the actual length of the meditation programme may have been too short, and secondly, the daily meditation sessions too brief to facilitate a process of personal growth and development from within the trans personal psychology framework. Thirdly, the subject was an adolescent school girl and thus may not have been developmentally ready in terms of reaching a level of cognitive, emotional, social and spiritual maturity necessary to experience identification to the transpersonal self.
- Full Text:
- Date Issued: 1991
- Authors: Knight, Zelda Gillian
- Date: 1991
- Subjects: Meditation Self-actualization (Psychology)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1466 , http://hdl.handle.net/10962/d1003347
- Description: A three month meditation programme based on Joseph Goldstein's (1976) instructions and discourses given at a Vipassana meditation retreat was implemented among four 17 year old white English-speaking school girls at a private non-racial co-educational high school in South Africa. The meditation experiences of all four subjects were noted, hut only one subject's meditative experiences were documented and used as a case study to explore their use as a tool for personal growth within the framework of ego-psychology and transpersonal psychology. It is concluded that the subject, who meditated on a daily basis, experienced personal growth primarily from the ego-psychology perspective and, it is interesting to note, less so from the transpersonal perspective. Three bypotheses have been put forward for this. Firstly, the actual length of the meditation programme may have been too short, and secondly, the daily meditation sessions too brief to facilitate a process of personal growth and development from within the trans personal psychology framework. Thirdly, the subject was an adolescent school girl and thus may not have been developmentally ready in terms of reaching a level of cognitive, emotional, social and spiritual maturity necessary to experience identification to the transpersonal self.
- Full Text:
- Date Issued: 1991
The development of East London through four decades of municipal control, 1873-1914
- Tankard, Keith Peter Tempest
- Authors: Tankard, Keith Peter Tempest
- Date: 1991
- Subjects: East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2560 , http://hdl.handle.net/10962/d1002413 , East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Description: This thesis is a study in Urban History which explores the development of East London, a port in the Border region of the Eastern Cape, South Africa, through four decades of municipal control from 1873 to 1914. The town had been established in 1847 as a supply route for the British forces during the War of the Axe (7th Frontier War) but the frontier nature of the port led to economic and physical stagnation during its initial 25 years of existence. Indeed, by the time that the municipality was established in 1873, there were still no streets beyond cart tracks, no established water supply, and sanitary conditions were medieval. The Town Council therefore had much to occupy its attention but lack of positive leadership resulted in failure to capitalise on prosperous economic conditions, while a depression in the 1880's led to a further truncation of growth. It was only in the 1890's that a combination of economic growth and vibrant leadership brought about rapid civic advance, with large-scale expenditure on street construction, as well as the establishment of electricity and a tramway system. The outbreak of the Anglo-Boer War in 1899 slowed progress, however, and a post-war depression placed renewed stress on the municipality. The thesis examines the progress of the town on a broad front, dealing with the issues of economic fluctuations, the growth of the harbour as the heart of the trading sector, the physical advance of the municipality, the search for a viable water supply, the evolution of public health and sanitation, and the establishment of the port as a coastal resort. In addition, it studies the conflict of social attitudes among the townspeople, the evolution of racial segregation, and the effects of the Anglo-Boer War on the town, with the influx of some 5 000 Uitlander refugees and the establishment of a Boer concentration camp. A final chapter attempts an analysis of the reasons behind the Town Council's inability to make the best use of its opportunities to foster the development of East London.
- Full Text:
- Date Issued: 1991
- Authors: Tankard, Keith Peter Tempest
- Date: 1991
- Subjects: East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2560 , http://hdl.handle.net/10962/d1002413 , East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Description: This thesis is a study in Urban History which explores the development of East London, a port in the Border region of the Eastern Cape, South Africa, through four decades of municipal control from 1873 to 1914. The town had been established in 1847 as a supply route for the British forces during the War of the Axe (7th Frontier War) but the frontier nature of the port led to economic and physical stagnation during its initial 25 years of existence. Indeed, by the time that the municipality was established in 1873, there were still no streets beyond cart tracks, no established water supply, and sanitary conditions were medieval. The Town Council therefore had much to occupy its attention but lack of positive leadership resulted in failure to capitalise on prosperous economic conditions, while a depression in the 1880's led to a further truncation of growth. It was only in the 1890's that a combination of economic growth and vibrant leadership brought about rapid civic advance, with large-scale expenditure on street construction, as well as the establishment of electricity and a tramway system. The outbreak of the Anglo-Boer War in 1899 slowed progress, however, and a post-war depression placed renewed stress on the municipality. The thesis examines the progress of the town on a broad front, dealing with the issues of economic fluctuations, the growth of the harbour as the heart of the trading sector, the physical advance of the municipality, the search for a viable water supply, the evolution of public health and sanitation, and the establishment of the port as a coastal resort. In addition, it studies the conflict of social attitudes among the townspeople, the evolution of racial segregation, and the effects of the Anglo-Boer War on the town, with the influx of some 5 000 Uitlander refugees and the establishment of a Boer concentration camp. A final chapter attempts an analysis of the reasons behind the Town Council's inability to make the best use of its opportunities to foster the development of East London.
- Full Text:
- Date Issued: 1991
The development, pursuit and maintenance of a South African Antarctic policy : 1926-1988
- Authors: Laverde, René
- Date: 1991
- Subjects: Antarctic Treaty -- (1959) , Antarctica -- History , South Africa -- Foreign relations -- Antarctica
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2523 , http://hdl.handle.net/10962/d1001852
- Description: Connections between South Africa and Antarctica can be traced as far back as the 1700s when European expeditions in search of the southern continent used Cape Town (and later Simonstown) as a base of operation. This link expanded considerably after formal British acquisition of the Cape of Good Hope in 1815, yet it was not until 1926 that an actual South African policy towards the Antarctic began to materialize. Once this policy was established it continued to be characterized by procrastination as well as resistance both from within and without South Africa. The history of South Africa's Antarctic policy can be divided into five periods: first, the commencement of the policy (focusing primarily on economic interests), 1926-1939; second, the pursuit of interests through the policy (focusing on political interests), 1944- 1958; third, the entrenchment of South Africa's interests in the Antarctic (by securing South Africa's position within the Antarctic Treaty System), 1958-1960; fourth, the expansion of and foreign assault on the policy (under the auspices of the Antarctic Treaty System), 1960-1988; and fifth, the defence of and future prospects for the policy (from United Nation's calls for South Africa's exclusion from the Antarctic Treaty System), since 1982. While resistance from inside and outside the government during the first two periods resulted from inadequacies in the South African Antarctic policy itself, resistance in the final two periods has centred upon non-Antarctic issues. As South Africa has faced ever-increasing exclusion from international governmental organizations over opposition to Its apartheid policies, organizations such as the Antarctic Treaty Organization have inevitably been drawn into the debate. As a result, the Consultative Parties of the Antarctic Treaty (of which South Africa is one of the original twelve) have been forced to deal with the following question: to what extent will political issues outside the scope of the management policies of the Antarctic Treaty Organization be allowed to affect the functioning of the Antarctic Treaty System? While the Consultative Parties continue to ponder this and the fact that South Africa's Consultative Status has become the most divisive factor within the Antarctic Treaty System, no final solutions to these issues appear likely before 1991.
- Full Text:
- Date Issued: 1991
- Authors: Laverde, René
- Date: 1991
- Subjects: Antarctic Treaty -- (1959) , Antarctica -- History , South Africa -- Foreign relations -- Antarctica
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2523 , http://hdl.handle.net/10962/d1001852
- Description: Connections between South Africa and Antarctica can be traced as far back as the 1700s when European expeditions in search of the southern continent used Cape Town (and later Simonstown) as a base of operation. This link expanded considerably after formal British acquisition of the Cape of Good Hope in 1815, yet it was not until 1926 that an actual South African policy towards the Antarctic began to materialize. Once this policy was established it continued to be characterized by procrastination as well as resistance both from within and without South Africa. The history of South Africa's Antarctic policy can be divided into five periods: first, the commencement of the policy (focusing primarily on economic interests), 1926-1939; second, the pursuit of interests through the policy (focusing on political interests), 1944- 1958; third, the entrenchment of South Africa's interests in the Antarctic (by securing South Africa's position within the Antarctic Treaty System), 1958-1960; fourth, the expansion of and foreign assault on the policy (under the auspices of the Antarctic Treaty System), 1960-1988; and fifth, the defence of and future prospects for the policy (from United Nation's calls for South Africa's exclusion from the Antarctic Treaty System), since 1982. While resistance from inside and outside the government during the first two periods resulted from inadequacies in the South African Antarctic policy itself, resistance in the final two periods has centred upon non-Antarctic issues. As South Africa has faced ever-increasing exclusion from international governmental organizations over opposition to Its apartheid policies, organizations such as the Antarctic Treaty Organization have inevitably been drawn into the debate. As a result, the Consultative Parties of the Antarctic Treaty (of which South Africa is one of the original twelve) have been forced to deal with the following question: to what extent will political issues outside the scope of the management policies of the Antarctic Treaty Organization be allowed to affect the functioning of the Antarctic Treaty System? While the Consultative Parties continue to ponder this and the fact that South Africa's Consultative Status has become the most divisive factor within the Antarctic Treaty System, no final solutions to these issues appear likely before 1991.
- Full Text:
- Date Issued: 1991
The digestive mechanisms of an intertidal grazer, the sea urchin Parechinus angulosus
- Authors: Sweijd, Neville Anthony
- Date: 1991
- Subjects: Sea urchins -- Nutrition , Sea urchins , Echinoida
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5662 , http://hdl.handle.net/10962/d1005346 , Sea urchins -- Nutrition , Sea urchins , Echinoida
- Description: Echinoids are important grazers in the near-shore ecosystem and can significantly effect their ecology. The sea urchin Parechinus angulosus occurs inter- and subtidally along the southern African coast. Within this range it consumes an extremely wide variety of algae. Since algal cell walls have an almost species specific chemical composition, the question arises as to how it can digest the algae that it consumes. In order to investigate the digestive mechanisms employed by P. angulosus, an ultrastructural study of the gut was undertaken to characterize the tissue and identify functional regions in the gut. Ten structural and storage polysaccharides commonly found in macroalgae were used as substrates to assay the digestive polysaccharidases of the sea urchin. The enteric bacteria of the sea urchin were isolated and tested separately for polysaccharidase activity using the same substrates. The results shown that the gut of Parechinus angulosus is regionally specialized, with the foregut primarily responsible for the production of hydrolytic enzymes, while the hindgut is primarily absorptive. The occurrence of lamellar bodies, heterolysosomes, cytoplasmic blebs and paddle cilia among other characteristic features of the digestive epithelium are described and discussed. Two levels of enzyme activity are apparent. Generally the urchin could hydrolyze the reserve polysaccharides, but only partially hydrolyze the structural polysaccharides, of red and green algae. P.angulosus was unable to digest alginic acid, the main structural polysaccharide of brown algae. Mixed cultures of bacteria utilized only the reserve polysaccharides of red and green algae. Significantly, the bacteria were able to hydrolyze alginic acid. Enteric bacteria also showed agarolytic activity. Parechinus angulosus has the ability to digest red and green algae. No lysozyme activity was detected. The enteric bacteria can digest the same algal reserve polysaccharides and so may compete for carbon in the gut. However, in the case of brown algae, bacteria have a potentially important endosymbiotic role as agents of digestion. These results correspond with food preference studies which have shown that, although P.angulosus consumes the kelp Ecklonia maxima, in the western Cape, it is amongst its least preferred food species. The reasons for this are its unpalatability and the urchin's inability to digest brown algae. The digestibility of algal material can be an important factor in determining algal-herbivore interactions.
- Full Text:
- Date Issued: 1991
- Authors: Sweijd, Neville Anthony
- Date: 1991
- Subjects: Sea urchins -- Nutrition , Sea urchins , Echinoida
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5662 , http://hdl.handle.net/10962/d1005346 , Sea urchins -- Nutrition , Sea urchins , Echinoida
- Description: Echinoids are important grazers in the near-shore ecosystem and can significantly effect their ecology. The sea urchin Parechinus angulosus occurs inter- and subtidally along the southern African coast. Within this range it consumes an extremely wide variety of algae. Since algal cell walls have an almost species specific chemical composition, the question arises as to how it can digest the algae that it consumes. In order to investigate the digestive mechanisms employed by P. angulosus, an ultrastructural study of the gut was undertaken to characterize the tissue and identify functional regions in the gut. Ten structural and storage polysaccharides commonly found in macroalgae were used as substrates to assay the digestive polysaccharidases of the sea urchin. The enteric bacteria of the sea urchin were isolated and tested separately for polysaccharidase activity using the same substrates. The results shown that the gut of Parechinus angulosus is regionally specialized, with the foregut primarily responsible for the production of hydrolytic enzymes, while the hindgut is primarily absorptive. The occurrence of lamellar bodies, heterolysosomes, cytoplasmic blebs and paddle cilia among other characteristic features of the digestive epithelium are described and discussed. Two levels of enzyme activity are apparent. Generally the urchin could hydrolyze the reserve polysaccharides, but only partially hydrolyze the structural polysaccharides, of red and green algae. P.angulosus was unable to digest alginic acid, the main structural polysaccharide of brown algae. Mixed cultures of bacteria utilized only the reserve polysaccharides of red and green algae. Significantly, the bacteria were able to hydrolyze alginic acid. Enteric bacteria also showed agarolytic activity. Parechinus angulosus has the ability to digest red and green algae. No lysozyme activity was detected. The enteric bacteria can digest the same algal reserve polysaccharides and so may compete for carbon in the gut. However, in the case of brown algae, bacteria have a potentially important endosymbiotic role as agents of digestion. These results correspond with food preference studies which have shown that, although P.angulosus consumes the kelp Ecklonia maxima, in the western Cape, it is amongst its least preferred food species. The reasons for this are its unpalatability and the urchin's inability to digest brown algae. The digestibility of algal material can be an important factor in determining algal-herbivore interactions.
- Full Text:
- Date Issued: 1991