Training in note making : the effects of a training scheme on first year teacher-training students
- Authors: Ferreira, Ignatius Leopold
- Date: 1992
- Subjects: Note-taking Teachers -- Training of Study skills
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1803 , http://hdl.handle.net/10962/d1003688
- Description: This research work is based upon a training technique devised and recommended by J. Smith (1985) in a pamphlet published by The British Historical Association. The technique involves training school pupils in the making of notes from text books and references and then selecting appropriate points to answer specific questions. The technique was slightly adapted and used on a small Experimental Group drawn from Black first year College of Education students at an Eastern Cape College. A Control Group from the same College received conventional lectures on two topicS from the first year college syllabus - the San and Khoi peoples of Southern Africa. The Experimental Group was given a brief training period in Smith's technique and then worked independently on extended reading passages on the same topics. Both groups received a similar introduction of a video tape on the San and a slide presentation on the Khoi. Both groups wrote the same final test after their learning experiences were over and both groups completed questionnaires on the initial visual input and on their reactions to the learning experience. Comparisons are drawn between the results and the students' reaction to those learning experiences.
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- Date Issued: 1992
The effect of pineapple cultivation on factors influencing soil erodibility in the Eastern Cape, South Africa
- Authors: Boucher, Kim Gillian
- Date: 1992
- Subjects: Soil erosion -- South Africa Pineapple industry -- South Africa -- Eastern Cape Agriculture -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4827 , http://hdl.handle.net/10962/d1005502
- Description: The study examines the effect of ridged pineapple cultivation on factors influencing the soil erodibility of Glenrosa and Oakleaf soil forms in the Bathurst district of South Africa. A number of physical and chemical variables influencing soil erodibility are investigated, namely soil moisture, bulk density, porosity, infiltration rate, aggregate stability, shear strength, soil texture, soil structure, penetrability, organic carbon, pH and cation exchange capacity. These soil characteristics are examined in undisturbed soils under natural vegetation and compared to those on adjacent traffic areas, pineapple ridges and pineapple furrows. The results of the analyses between the four sample sites indicate that ridged cultivation of pineapples has a negative effect on factors influencing soil erodibility on the areas studied. The results of the analysis within each of the sample sites do not illustrate any clear relationships and thus depict the complexity and multiplicity of the soil erodibility phenomenon. A further study, augmenting the soil erodibility data with actual soil loss data, is recommended
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- Date Issued: 1992
Observing and describing textual "reality": a critique of the claims to objective reality and authentication in new critical and structuralist literary theory, seen against a background of Feyerabend's ideas concerning paradigms, dominance and ideology
- Authors: Masters, Kenneth Andrew
- Date: 1992
- Subjects: Feyerabend, Paul, 1924-1994 , Criticism , Structuralism (Literary analysis) , Science and the arts , Reality , Objectivity
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2247 , http://hdl.handle.net/10962/d1002290 , Feyerabend, Paul, 1924-1994 , Criticism , Structuralism (Literary analysis) , Science and the arts , Reality , Objectivity
- Description: This thesis sets out to examine the claims to objective reality and authentication in New critical and Structuralist literary theories, concentrating on their claims to "objectivity" and "scientific validity." It examines the nature of these claims in the light of the original ideas proposed by some of the major New critics and structuralists in the development of their respective "sciences" of literary theory. Taking direction from the nature of reality and objectivity shown by the theorists, the thesis then attempts an assessment of the validity of some of the original perceptions and presuppositions concerning scientific objectivity and reality. It proposes that inconsistencies within the literary theories resulted from the theorists' inability to grasp the complexity and fluctuating nature of the borrowed terminology and principles that they were using. It does so by taking a closer look at the development of some of the more influential physical theories and the philosophical ideas raised by these developments. It then uses Feyerabend's work on paradigms, dominance and ideology to attempt an assessment of the reasons for the literary theorists' perceptions and presuppositions regarding objectivity and reality. This amounts to accounting for the specific scientific models chosen as bases, and also to accounting for the desire for the "scientific approach" at all. Its conclusions give an indication of the extent to which these original errors contributed to the theories' necessary adaptations of perspective and eventual loss of influence, and emphasises the need for the total understanding of concepts in one field by researchers in other fields, especially if those concepts are to be used by the researchers with any degree of precision.
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- Date Issued: 1992
Rhodes University Annual Report 1992
- Authors: Rhodes University
- Date: 1992
- Subjects: Rhodes University -- history Rhodes University -- employees Rhodes University -- students
- Language: English
- Identifier: vital:20040
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- Date Issued: 1992
A critical analysis of problems encountered by senior secondary school pupils in the reading and interpretation of 1:50,000 topographical maps and aerial photographs with special reference to black pupils in Transkei
- Authors: Ndlwana, Monica
- Date: 1992
- Subjects: Maps -- Study and teaching (Secondary) Geography -- South Africa -- Transkei -- Study and teaching (Secondary) Black people -- Education -- South Africa -- Transkei
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1470 , http://hdl.handle.net/10962/d1003351
- Description: Mapwork is an established part of the geography curriculum, and yet it poses particular problems for pupils and teachers. Maps participate in a complex system of graphic communication: the conceptual abstraction involved in the reading and interpretation of maps requires on the part of pupils a high degree of cognitive and perceptual development; teachers, too, often experience considerable difficulty in imparting the skills necessary for graphic literacy (graphicacy). The peculiar difficulties associated with map reading and the poor performance of pupils in this area have regrettably encouraged an attitude which dismisses mapwork as irrelevant or dispensable in geographical education. Yet graphicacy is essential not only in the learning of geography but in the overall cognitive development of the child, and therefore cannot be excluded from the curriculum. This study attempts to identify some of the specific difficulties experienced by pupils in their attempts to read and interpret maps, and to trace the origin of these difficulties. It argues that the complexity and sophistication of the skills necessary to interpret topographical maps and aerial photographs, for instance, should not be underestimated. Teachers need to be made aware of how pupils acquire map reading skills and of the problems they encounter during this process, so that teaching programmes commensurate with pupils' level of cognitive development can be formulated. It is also important that mapwork be taught in as practical a manner as possible. The findings and recommendations of this study have implications for geography teachers, textbook writers and educational authorities, especially those involved in curriculum and syllabus design.
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- Date Issued: 1992
Ngalanga 5th movement
- Authors: Venancio Mbande and his Timbila players , Tracey, Andrew T N
- Date: 1992
- Subjects: Chopi (African people) -- Music , Folk music -- South Africa , Xylophone (Musical instrument) , Drum (Musical instruments) , Sub-Saharan African music , Africa South Africa Wildebeesfontein f-za
- Language: Chopi
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/98903 , vital:31641 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC076a-05
- Description: Traditional Ngalanga dance song for young people with 3 Timbila xylophone and 3 drums accompaniment
- Full Text: false
- Date Issued: 1992
The "Big E": the English (first language) endorsement on the teacher's bilingualism certificate: an investigation into the background to and origin of this requirement, an evaluation of past and current examining practices and standards and criteria, a needs assessment, and suggestions and recommendations for sound practice
- Authors: Spingies, Conrad
- Date: 1992
- Subjects: Teachers -- Training of -- South Africa Teachers -- Selection and appointment Teachers -- Language Teachers -- Certification -- South Africa Bilingualism -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1427 , http://hdl.handle.net/10962/d1003308
- Description: South African education authorities demand of teachers a high degree of competency in both official languages. In the Cape Province in particular, teachers are not considered eligible for promotion posts unless they possess the so-called Higher Bilingualism Certificate, signifying their command of both official languages at "First Language" level. In view of the fact that the overwhelming majority of schools nowadays are single-medium institutions; this requirement may strike the objective observer as an anomaly. An attempt was made, therefore, first of all to investigate the historical background to this requirement. The "language question", a problematic feature of South African education since the beginning of the nineteenth.century, was not resolved when legislators chose "bilingualism and language equality" for the Union of South Africa in 1910. The available evidence suggests, however, that bilingualism was actively pursued as an educational ideal at least until the end of the 1940s, and for this reason education authorities placed a high premium on teachers who were "fully bilingual". Nowadays the typical (White) school is a single-medium institution where the second language is rarely if ever heard outside the classroom where it is taught as a subject. The present policy, to demand a high degree of proficiency in both official languages of teachers occupying promotion posts at such a school, may then be described not only as an anomaly, but as an anachronism. A further problem is the fact that the various educational institutions (specifically teachers' colleges and universities) that set examinations leading to the Higher Bilingualism Certificate rarely communicate with one another, and are therefore unable to agree on uniform standards and criteria, or to ensure that such standards are maintained. That this is indeed the case, was confirmed by examination of "Big E" test papers set at three teachers' colleges, two Colleges for Continued Training, and four universities in the Cape Province. In an attempt to establish what assistance and support might be needed by a "second language" user of English in order for him to improve to the point where he resembled a "first language" user of English in his "terminal language behaviour", a comparison (by means of error analysis) of the responses of two groups (an Ll and an L2 group) to the same test paper was undertaken. The available evidence suggests that L2 users may need to be helped to acquire a more extensive vocabulary, but, above all, that they need to improve their ability to handle two crucially important aspects of usage: idiom and grammar. The final chapter attempts to establish pedagogic and linguistic bases for a course intended for "Big E" candidates, and makes recommendations with regard to (i) the content and the form of the course, and (ii) sound examination practice. The concluding thoughts offer the view that such a course could remain useful even in a future South Africa where the emphasis may shift from a demand for teachers who are "fully bilingual" to teachers who have a good command of English.
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- Date Issued: 1992
Phase equilibria in three component systems alcohol-hydrocarbon-water
- Authors: Siswana, Msimelelo Patrick
- Date: 1992
- Subjects: Chemical equilibrium , Liquid-liquid equilibrium , Alcohol as fuel , Hydrocarbons , Water chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4327 , http://hdl.handle.net/10962/d1004988 , Chemical equilibrium , Liquid-liquid equilibrium , Alcohol as fuel , Hydrocarbons , Water chemistry
- Description: The fuel industry in many parts of the world is blending alcohols with motor fuel either to extend the fuel or to improve its octane rating or both. Unfortunately alcohols are hygroscopic and as a result, water becomes a component of the fuel. This can lead to phase separation and the formation of a water-rich layer which could have serious corrosion consequences. In an attempt to understand the phase-splitting in alcohol-petrol-water blends, phase equilibria in ternary systems (alcohol-hydrocarbon-water) have been determined by experiment. The phase equilibria in these ternary systems are also discussed in terms of modern theories of liquid mixtures and the UNIQUAC theory is applied to the "ethanol + benzene + water" ternary system. The alcohols are all the C₁, C₂, C₃ and C₄ alcohols, and the hydrocarbons include those typically found in petrol, e.g. cyclohexane, benzene and substituted benzenes.
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- Date Issued: 1992
Industrial social work : an exploration and an assessment of the practice of social work in industry in South Africa
- Authors: Rankin, Pedro
- Date: 1992
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3279 , http://hdl.handle.net/10962/d1006474
- Description: Industries in South Africa have been employing social workers in increasing numbers during the last decade, and in several of the bigger industries social work seem to have succeeded in establishing itself over the course of time. Certain forces seem to be operating in both industry and social work which could facilitate the introduction and development of industrial social work as a specialised field of practice in South Africa. Very significant variables in this regard are a rapidly changing labour force, and certain socio-political developments in South Africa, that took place especially during the last decade, and in particular during the past two years. A lack of knowledge about the practice of social work in industry exists in South Africa, mainly as a result of a general lack of empirical research into this field. The main purpose of this research project was to add to the knowledge about the nature of industrial social work practice in South Africa, and to contribute to an understanding of the forces influencing its development. In order to achieve this overall purpose, an extensive review of the existing literature was done with the aim of identifying and describing the present trends and issues in industrial social work thinking. This was combined with an empirical investigation into the practice of social workers presently employed in industry in South Africa. In addition to this, the attitude of industries not employing social workers was established with a view of determining factors influencing the further development of industrial social work. A third component of the empirical investigation consisted of a survey of the attitudes and knowledge of community welfare organisations regarding industrial social work practice. This was done in an effort to establish the amount of support for industrial social work from the rest of the profession. The findings of the empirical investigation indicated an emphasis on the individual employee as far as the practice of industrial social work is concerned - an EAP model thus. Industries not employing social workers still seem to need more education as far as the true nature of social work practice is concerned, and there seem to be a reserved acceptance of industrial social work practice amongst community welfare organisations, as well as a lack of knowledge. In conclusion it can be stated that the social work fraternity in South Africa should take more serious notice of occupational social work practice in South Africa in general, and of industrial social work practice in particular, mainly because of its importance to the worker.
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- Date Issued: 1992
Small-scale gold mining in southern Africa
- Authors: Joubert, Barend Daniel
- Date: 1992
- Subjects: Gold mines and mining -- South Africa , Abandoned mines , Abandoned mines -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5002 , http://hdl.handle.net/10962/d1005615 , Gold mines and mining -- South Africa , Abandoned mines , Abandoned mines -- South Africa
- Description: The general characteristics of gold deposits are reviewed, and a classification of gold deposits based on mineability is proposed. Evaluation, mlnlng and beneficiation methods are briefly discussed. It is concluded that the most viable targets for small-scale companies comprise deposits that require the least pre-production time and expense. Great potential exists for the small-scale reclamation of gold from tailings dumps and abandoned mines in Southern Africa. There is also potential for developing new smallscale gold mines in the Archaean greenstone terranes of the Zimbabwean and Kaapvaal cratons.
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- Date Issued: 1992
The exploration for and possible genesis of, some Archaean granite/gneiss-hosted gold deposits in the Pietersburg granite-greenstone terrane
- Authors: Linklater, Michael Anthony Leonard Flanders
- Date: 1992
- Subjects: Gold ores -- Geology -- South Africa , Gneiss , Granite
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4945 , http://hdl.handle.net/10962/d1005557 , Gold ores -- Geology -- South Africa , Gneiss , Granite
- Description: Abstract The gold mineralization event within Archaean granite-greenstone terranes occurred during the late Archaean, and followed the intrusion of syn- to late-tectonic granitic plutons into previously deformed greenstone belts. An Archaean granite/gneiss-hosted gold deposit, in terms of this project, is classified as having a gold-assay cutoff of 1g/metric ton over widths of at least several metres, or higher grades over narrower widths and/or verbal descriptions that indicate such values. Fluid inclusion studies and isotopic data identify two possible origins for the auriferous fluids; namely magmatic and metamorphic. The exploration target according to the magmatic model, is a late-Archaean, hydrothermally altered, mineralized and fractured granitic intrusion preferably with a granodioritic or quartz-dioritic composition. The exploration target according to the metamorphic replacement model is a granitic stock that has intruded a zone of crustal weakness such as a shear zone, active during the late Archaean. Alternatively, the granitic intrusion should be affected by regionally extensive late-Archaean shearing. It should be hydrothermally altered, deformed and mineralized. Five areas within the Pietersburg granite-greenstone terrane were selected for the 'Regional Area Selection' phase of exploration for Archaean granite/gneiss-hosted gold deposits; namely Roodepoort, Waterval, Ramagoep, Moletsie and Matlala. Roodepoort contains a known granodiorite-hosted gold deposit; the Knight's Pluton, and served as an orientation survey for this project. The use and interpretation of LANDSAT images formed an integral part of exploration techniques; to assess their usefulness in the exploration of Archaean granite/gneiss-hosted gold deposits. Area selection criteria for granite/gneiss-hosted gold mineralization at Roodepoort are the major ENE-trending shear zone, the NNW-trending lineament and hydrothermal alteration, shearing, quartz-stockworks and sulphide mineralization within the Knight's Pluton. The origin of the gold within the Knight's Pluton is uncertain; both magmatic and metamorphic models are possibilities. Ongoing exploration is in progress at Roodepoort. The only area selection criterion for granite/gneiss-hosted gold mineralization at Waterval is the sericitized, subcropping granites located within trenches. Gold mineralization is insignificant. No area selection criteria for Archaean granite/gneiss-hosted gold mineralization were located at Ramagoep, Matlala and Moletsie. No further exploration is recommended for all these areas. The MES image interpretations were successful in identifying lineaments, granitic outcrops, greenstones, vegetation and soil cover. The Clay-iron images adequately differentiated betweeen iron-rich and clay-bearing areas. However, not all clay-bearing areas were associated with hydrothermal alteratian; field checks were necessary to discriminate between weathered granites and hydrothermally altered granites. The Wallis images served to locally enhance the contrasts of the MES and Clay-iron images.
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- Date Issued: 1992
"Constructive critic" or "donor agency": does the World Bank have a role to play in sub-Saharan Africa's development beyond that of providing economic aid?
- Authors: Thompson, Christine Audra
- Date: 1992
- Subjects: Africa, Sub-Saharan -- Economic conditions -- 20th century , World Bank -- Africa, Sub-Saharan , Africa, Sub-Saharan -- Economic conditions
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2835 , http://hdl.handle.net/10962/d1003045 , Africa, Sub-Saharan -- Economic conditions -- 20th century , World Bank -- Africa, Sub-Saharan , Africa, Sub-Saharan -- Economic conditions
- Description: This thesis attempts to evaluate the role of the World Bank in Sub-Saharan Africa's development. It argues that the World Bank has stepped beyond the boundaries of a typical lending institution by linking its aid to political reform. The study argues that in this capacity the Bank has contributed to the halting democratization process currently underway in Africa. The economic effects of the World Bank's Structural Adjustment Programmes have been less successful. As yet, the programmes have not produced the expected results and there is no evidence of long-term, sustainable economic recovery in Sub-Saharan Africa. These programmes are, however, long-term strategies and it may therefore be too premature to reach a final conclusion. They may also have been affected negatively by unfavourable political environments. This study, noting the negative effects of the international terms of trade and prices for African exports, concludes that although economic recovery in Sub-Saharan Africa will be facilitated by domestic political and economic policy reform, there is also a need for reform of the international economic order. The World Bank has correctly identified the need for domestic improvement, but it has a tendency to disregard the negative consequences of the existing structure of the international economy.
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- Date Issued: 1992
Complete regularity and related concepts in L-uniform spaces
- Authors: Harnett, Rait Sicklen
- Date: 1992
- Subjects: Uniform spaces , Mathematics -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5403 , http://hdl.handle.net/10962/d1005217 , Uniform spaces , Mathematics -- Research
- Description: L will denote a completely distributive lattice with an order reversing involution. The concept of an L-uniform space is introduced. An extension theorem concerning L-uniformly continuous functions is proved. A characterisation of L-uniformizability, involving L-complete regularity is given. With respect to L--completely regular spaces it is shown that the topological modification of an L-completely regular space is completely regular. Furthermore it is shown that the topologically generated L-topology of a completely regular space is L-completely regular.
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- Date Issued: 1992
The geochemical evolution of three alkaline complexes in the Kuboos-Bremen igneous province, southern Namibia
- Authors: Smithies, Robert Hugh
- Date: 1992
- Subjects: Alkalic igneous rocks -- Namibia Geochemistry -- Namibia
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4952 , http://hdl.handle.net/10962/d1005564
- Description: The Kuboos-Bremen Igneous Province comprises a linear zone of alkaline complexes that intrude Proterozoic and Pan-African rocks and trends in a northeast direction from the northwest of the Cape Province in South Africa into southern Namibia. Of the three most southerly complexes in Namibia. two comprise silicate rocks ranging from nepheline syenite to alkali-granite and are called the Grootpenseiland and Marinkas Kwela Complexes (GPC and MKC). The Marinkas Kwela Carbonatite Complex is the third and most northerly of the complexes. Isotopic age determinations on a number of rock types from both the silicate complexes yield ages around 520Ma and are consistent with published Pan-African ages for the Province. Each silicate complex shows a migrating locus of intrusion from Siundersaturated rocks in the southwest to Si-oversaturated rocks in the northeast. The complexes overlap in outcrop. The rocks are moderately to highly felsiC and none reflects primary magma compositions. The Si-undersaturated rocks from both complexes include side-wall cumulates formed from magmas that fractionated alkali-feldspar, clinopyroxene and amphibole. Foyaites also occur in the MKC and have a compositional range reflecting alkali-feldspar fractionation and, probably, some interaction with dolomite country rocks. Major and trace element data suggest that critically saturated alkali syenites occurring in both complexes evolved via protracted feldspar fractionation, and that critically saturated alkali-feldspar syenite occurring only in the GPC is a cumulate. The two rock types cannot be related genetically. Of the SI-oversaturated rocks in both complexes, those in the compositional range monzonite to granite were intruded before alkali-granites. Compositional diversity amongst the former reflects fractionation of feldspar and of mafic phases, but that process cannot genetically link the rocks to the alkali-granites. Isotopic compositions of Sr and Nd indicate that the silicate magmas were derived from an upper mantle source region characterised by low time-integrated Rb/Sr ratios and high time-Integrated Sm/Nd ratios, However, the evidence of Sr and 0 isotopic data is that the Si-oversaturated melts possibly interacted with a crustal component. presumably the Proterowlc rocks of the Namaqua Metamorphic Province. This interaction may explain the occurrence of apparently co-genetic rock series that evolved on opposite sides of the feldspar join in Petrogeny's Residua System. The Marinkas Kwela Carbonatite Complex was emplaced before the final intrusive phases of the MKC and exhibits unusually pronounced late-stage enrichment in manganese. The earliest intrusive rocks in the complex were nepheline syenites which were fenitised by later intrusions of sôvites. Although the commonly occurring magmatic sequence of sôvite-beforsite-ferrocarbonatite is observed at Marinkas Kwela, sôvites do not appear to have been parental to beforsites. Removal of apatite and early crystallisation of magnetite distinguish magnetite-rich beforsite from co-genetic apatite-rich beforsite. Two further magmatic sequences. the first from apatite-rich beforsite through ferrocarbonatite to Mn-rich ferrocarbonatite (high Fe/Mn) and the second from magnetite-rich beforsite to Mn-rich ferrocarbonatite (low Fe/Mn). reflect fractionation of dolomite and of dolomite+magnetite respectively.
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- Date Issued: 1992
Ecological effects of impoundments in the Buffalo River, Eastern Cape, with particular reference to the distribution of blackflies (Diptera : simuliidae)
- Authors: Palmer, Robert William
- Date: 1992
- Subjects: Stream ecology -- South Africa -- Buffalo River (Eastern Cape) Dipter -- South Africa -- Buffalo River (Eastern Cape)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:6028 , http://hdl.handle.net/10962/d1006157
- Description: This thesis examines the extent and intensity of the effects of impoundments on selected physical, chemical and biotic conditions in an impounded southern African river. Life-history characteristics and environmental requirements which determine the success of impoundment-outlet blackflies in southern Africa were studied. Difficulties with the identification of immature blackflies led to a search for additional diagnostic characters, the description of larvae of seven species previously unknown, and the development of new keys to the species of Simulium (larvae and pupae) in southern Africa. Distribution records for each species are presented, and their ecology is summarised. Three pairs of closely related species, which were formerly indistinguishable, can now be recognised by differences between the structure of their cephalic fan microtrichia. Monthly physical, chemical and invertebrate samples at 16 sites upstream and downstream of four impoundments in the Buffalo River, eastern Cape, were taken over a period of two years. The downstream effects of impoundments on these parameters depended on the variable examined, the position of the impoundment along the river profile, the depth from which water was released, and the quality of the inflowing water. Impoundments in the Buffalo River caused an upstream shift of the thermal and suspended organic conditions, and the distribution of blackfly species. Surface-release impoundments in the clean, upper-reaches of the river caused increases in water temperature (by as much as 8ºC) and chlorophyll a (by as much as 600%). Recovery to riverine conditions was within 2.6 to 18.4 km, depending on flow. A polluted, surface-release impoundment in the middle-reaches of the river had a slight dampening effect on river temperatures, converted the particle size spectrum of the river from small (<80 μm) to large (250-1000 μm), and improved the water quality of the downstream reaches (with the exception of nitrate concentrations, which were higher in the tailwaters compared to inflowing water). An impoundment in the lower reaches caused reductions in maximum temperature of up to 6ºC when releasing water from the surface, and up to 16ºC when releasing water from the bottom. Bottom-released water carried high concentrations (36 to 190 g m³) of small (<5 μm) and largely inorganic (86 to 93%) material.Twenty species of blackflies were found in the Buffalo River, of which 18 were distinguishable as larvae. They were divided into those which were widespread (5 taxa), those restricted to waterfalls and mountain torrents (2 taxa), those found in the foothill stony run zone (6 taxa), and rare taxa (5 taxa). Impoundments in the Buffalo River did not alter population densities of blackfly larvae, but did alter blackfly species composition, favouring five species commonly found in mid-order streams in southern Africa (s. meduseaforme, S. hargreavesi, S. nigritarse, S. adersi and s. damnosum s.l.) at the expense of upper-reach species (s. rutherfoordi, S. letabum and s. impukane). These five species are regarded as typical of impoundment-outlets, and were small, multivoltine flies whose larvae shared a generalised cephalic fan microtrichial structure, consisting of a single row of moderately differentiated microtrichia. A strong relation was found between cephalic fan microtrichial structure and larval habitats: Taxa found in fast-flowing, clear water had a more complex fan structure compared to those found in slow-flowing, turbid water. It is concluded that impoundment-induced changes to hydrodynamics and transported material (food) are important factors which have changed the distribution of blackflies in southern Africa in recent times. These changes are more severe downstream of upper-reach impoundments than middle or lower-reach impoundments.
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- Date Issued: 1992
Understanding and treating combat-related post traumatic stress disorder: a soldier's story
- Authors: Koen, Gary
- Date: 1992
- Subjects: Post-traumatic stress disorder -- Case studies , Post-traumatic stress disorder -- Treatment , Soldiers -- Mental health -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3134 , http://hdl.handle.net/10962/d1006879 , Post-traumatic stress disorder -- Case studies , Post-traumatic stress disorder -- Treatment , Soldiers -- Mental health -- South Africa
- Description: This work documents the treatment of a 20-year-old male suffering from Post Traumatic Stress Disorder as a result of his experience during two years of national service as an Operations "Ops" Medic in the South African Defence Force. The literature review is drawn largely from the body of work emerging from the Vietnam War, and in particular the work of Robert Lifton and Erwin Parson is considered. The case study consists of a detailed synopsis of the treatment based upon material from the therapy sessions. This section hopes to accurately convey the experience of working with someone suffering from Post Traumatic Stress Disorder and provide insight into the dynamics of such a therapeutic relationship. Finally the discussion examines the links between the theory and the treatment and attempts to understand the various factors which shaped and influenced the final outcome of the therapy. Special consideration is given to showing how essentially cognitive restructuring techniques are successfully utilised within a more existential, psychodynamic framework. Furthermore, there is a paucity of literature on the subject of combat-related Post Traumatic Stress Disorder in South Africa and it is hoped that this work will both point to a need for further research in this field whilst simultaneously provide guidance for those who wish to become involved in working with individuals suffering from Post Traumatic Stress Disorder.
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- Date Issued: 1992
Die sosio-ekonomiese opname as instrument vir die inisiëring van 'n ontwikkelingsproses in 'n landelike gemeenskap met spesifieke verwysing na Wartburg
- Authors: Rossouw, Anthonie Michael Müller
- Date: 1992
- Subjects: Community development -- South Africa -- Wartburg Social service -- South Africa -- Wartburg Social service -- Research Rural poor -- South Africa
- Language: Afrikaans
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3280 , http://hdl.handle.net/10962/d1006475
- Description: Aim of this study. The problem of poverty, especially in rural S.A ., formed the basis for the questions and hypotheses posed in this study. Poverty stricken communities, with the accompanying suffering, the immobilizing effect of poverty and the present climate of urgent changes in S.A., were also apparent in Wartburg (study area). The problem was to initiate development in such a way that the chances of failure and therefore the wasting of already scarce resources is minimized. The manner in which development is initiated and what are viewed as desirable elements of development should culminate into achieving self-sustaining development in the long term. It became clear therefore that a complete data base needs to be established in order to initiate such a development process. In this study the aim was to investigate the role which research plays in the process of development. Method. This study can be divided into two sections, viz an investigation into the theoretical basis for achieving a self-sustaining process of development and how research should be done within such a process. Secondly, the practical application of such a theoretical basis was tested and forms the empirical section of this study. The first section was completed by undertaking a literature study. The conditions set for the development process guided the researcher increasingly to a holistic perspective, Community Development and the state of the art of Social Work Practice. The second part of this study was done through empirical research. The questionnaire method was utilized where structured interviews were conducted by properly trained field workers who were of similar cultural background as the community involved in the survey. The data was processed by using the B.M.D.P. programme and recorded in section B of this report. From section A and B of this report conclusions were drawn regarding the development process, the role research has in this process and the task of the Social Work Profession in this regard. Findings. From the theory it seemed that the state of the art regarding social Work Practice upholds a holistic perspective and views community practice and development as an important function within this perspective. It seems that a unitary approach to Social Work is increasingly becoming a reality in the pursuit of a holistic perspective as well as by stressing the importance of community practice. The integrated approach to Social Work Practice seems to collaborate with these views. The role of research is equally important to social Work Practice as it is to Community Development and should be viewed as an integral part of the Social Work Process/Practice. The empirical section of this study is a clear example of what can be achieved by a properly planned and executed research project which forms an integral part of a development process. Together with the community valuable data were drawn from the data base. These conclusions were directly employed to identify priorities and in planning specific projects. Conclusions. This study concludes, firstly, that Social Work Practice has an obvious task in the field of community development. This profession can contribute to a large extent toward making development more human and to acknowledge the importance of both man and his environment when considering development. The study also showed that research is an integral part of a development process, especially where the aim is that of a perpetuating, self-sustaining development process. In short, it seems that the Socio-economic research meets the requirements set by the aforementioned development process, but that refining seems necessary in order to make it more effective and useful as an instrument for initiating such a process of development as discussed in the above paragraphs.
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- Date Issued: 1992
Mzeno
- Authors: Venancio Mbande and his Chopi timbila xylophone group , Tracey, Andrew T N
- Date: 1992
- Subjects: Chopi (African people) -- South Africa , Folk music , Xylophone music , Rattle (Musical instrument) , Drum (Musical instrument) , Africa South Africa Rustenburg f-sa
- Language: Chopi
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/96489 , vital:31285 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC049b-03
- Description: Traditional dance song accompanied by timbila xylophone rattles and one drum
- Full Text: false
- Date Issued: 1992
Remote sensing of algae in inland southern African waters
- Authors: Quibell, G. E
- Date: 1992
- Subjects: Algae -- Remote sensing , Algae -- South Africa , Freshwater algae -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5752 , http://hdl.handle.net/10962/d1005440 , Algae -- Remote sensing , Algae -- South Africa , Freshwater algae -- South Africa
- Description: Routine monitoring of algae in inland waters in southern Africa is a critical element in assessing the efficacy of eutrophication management options. Several authors have indicated that single point samples are not necessarily representative of conditions throughout the water body and some have suggested remote sensing as a means of overcoming this problem. Remote sensing of algae normally involves deriving the empirical relationship between radiance detected at a sensor, and contact sensed chlorophyll concentrations. Quantification of, or compensation for, contributions to the upwelling radiance other than that light reflected by the algae is critical for this approach. In southern Africa these contributions arise primarily from atmospheric effects and from scattering by sediments in the water. A review of the atmospheric correction models suggested that a cosine sun angle correction followed by dark pixel subtraction is the most feasible method to compensate for the former effects. Studies of the changes in upwelling radiance induced by addition of sediment to algal cultures indicated that subtraction of reflectance at ≈665nm from that at ≈700nm, may provide a means of compensating for the scattering by sediments. The disadvantage of this approach is that few sensor systems have narrow spectral bands centred at these wavelengths. Investigations of the nature of the reflectance from 5 algal species indicated that all had similar reflectance spectra, but the blue-green genera had a smaller peak at ≈650nm. Chlorophyll absorption at ≈665nm was evident by lower reflectance at this point, but the alga Microcystis sp. did not conform to the conceptual model of reflectance, in that reflectance at 665nm was higher at increased cell density. Spectra of natural waters confirmed the results obtained in the laboratory. Reflectance at ≈700nm showed the largest changes with increasing chlorophyll concentration and also had the highest correlations to chlorophyll concentrations. However, due to the strong absorption of these wavelengths by water, this reflectance peak only occurred when sufficient cells were found in the upper layers of water. Use of these wavelengths in remote sensing models should therefore be restricted to highly eutrophied waters. Although the reflectance spectra of different algae were similar, the amount of light scattered by each species (measured as turbidity) differed for any given chlorophyll concentration. This appeared to be due to the colonial nature of the cells and means that empirical models will be unique to the species on which they were developed. Comparisons of multispectral photography (MSP) and LANDSAT MSS imagery indicated the MSP data had higher correlations with chlorophyll concentrations than did the MSS data. Chlorophyll simulations from a test set of data using ordinary multiple regression showed that the MSP imagery had mean errors of 7.3M9/I, while that for the MSS imagery was 7.4M9/I. Similar tests using the canonical procedure produced larger mean errors of 9M9/I and 12M9/I for the MSP and MSS data respectively. This was due to the fact that the canonical procedure is not suitable for the spectral band widths of these sensors. In spite of similar simulation accuracies, the MSS imagery produced very patchy synoptic views. This was due to the lower variance (radiometric resolution) in the LANDSAT MSS data. This appears to be the most important criterion for accurate chlorophyll mapping in inland waters. Development of a single multidate algorithm for southern Africa is not yet feasible, and routine monitoring of chlorophyll using these techniques is impractical. However acceptable chlorophyll maps are possible if the model is recalibrated for each occasion and the sensor used has a high radiometric resolution.
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- Date Issued: 1992