CSP-i : an implementation of CSP
- Authors: Wrench, Karen Lee
- Date: 1987 , 2013-03-08
- Subjects: Synchronization--Computers , Programming languages (Electronic computers)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4579 , http://hdl.handle.net/10962/d1003124 , Synchronization--Computers , Programming languages (Electronic computers)
- Description: CSP (Communicating Sequential Processes) is a notation proposed by Hoare, for expressing process communication and synchronization. Although this notation has been widely acclaimed, Hoare himself never implemented it as a computer language. He did however produce the necessary correctness proofs and subsequently the notation has been adopted (in various guises) by the designers of other concurrent languages such as Ada and occam. Only two attempts have been made at a direct and precise implementation of CSP. With closer scrutiny, even these implementations are found to deviate from the specifications expounded by Hoare, and in so doing restrict the original proposal. This thesis comprises two main sections. The first of these includes a brief look at the primitives of concurrent programming, followed by a comparative study of the existing adaptations of CSP and other message passing languages. The latter section is devoted to a description of the author's attempt at an original implementation of the notation. The result of this attempt is the creation of the CSP-i language and a suitable environment for executing CSP-i programs on an IBM PC. The CSP-i implementation is comparable with other concurrent systems presently available. In some aspects, the primitives featured in CSP-i provide the user with a more efficient and concise notation for expressing concurrent algorithms than several other message-based languages, notably occam. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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- Date Issued: 1987
A taxonomic revision of the genus Synodontis (Pisces, Mochokidae) in Southern Africa
- Authors: White, Peter Nevins
- Date: 1987
- Subjects: Mochokidae -- Africa, Southern -- Classification , Synodontis -- Africa, Southern -- Classification
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5193 , http://hdl.handle.net/10962/d1001969 , Mochokidae -- Africa, Southern -- Classification , Synodontis -- Africa, Southern -- Classification
- Description: The alpha taxonomy of the southern African Synodontis is reviewed, based on the analysis of 48 characters. The previously descriptive characters of barbel branching and humeral process shape are compared by various quantitative methods. The variation in colour pattern is recorded with the aid of detailed line drawings. The definitions of head length, head width and humeral process length are altered slightly from their traditional descriptions to ensure greater consistency and precision in measurement. New characters include the size of the caudal fork, the number, shape and arrangement of the premaxillary teeth, and two measurements between the cranium and pectoral girdle. Both uni- and bivariate methods are used to record and compare the intraspecific variation of each character. Principal components analysis of 19 morphometric characters is used to assess the degree of similarity of nine allopatric populations of S. zambezensis. Ten species are recognized from the study area, two of which are described as new: S. nebulosus Peters 1852, S. zambezensis Peters 1852, S. nigromaculatus Boulenger 1905, S. njassae Keilhack 1908, S. woosnami Boulenger 1911, S. macrostigma Boulenger 1911, S. leopardinus Pellegrin 1914, S. thamalakanensis Fowler 1935, S. macrostoma sp.n. and S.vanderwaali sp.n. A key to their identification is provided. Characters are discussed in terms of their contribution to the identification of the southern African species and, where possible, suggestions made concerning the value of these characters to the taxonomy of the genus as a whole. The rejection of certain characters previously used in Synodontis keys is discussed and alternatives proposed. The state of southern African Synodontis taxonomy is assessed and recommendations for future research are given
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- Date Issued: 1987
An analysis of problems arising out of English medium instruction of pupils in ten Ciskeian schools, with particular reference to geography in standard eight
- Authors: Weimann, Alan Gilbert
- Date: 1987
- Subjects: Geography -- Study and teaching (Secondary) -- South Africa -- Ciskei , Language and education -- South Africa -- Ciskei , Native language and education -- South Africa -- Ciskei , Students, Black -- Education -- South Africa -- Ciskei , Language arts -- South Africa -- Ciskei
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1342 , http://hdl.handle.net/10962/d1001408
- Description: Pupils in the Republic of South Africa in the T.B.V.C. States (Transkei, Bophuthatswana, Venda and Ciskei) are expected to commence study in all school subjects, except the first language (Xhosa, Tswana, Venda etc.) and the third language (Afrikaans), through the medium of English at the Std 3 level. English thus is the official medium of instruction for the greater part of the pupil's school experience. All examinations in all subjects (except those mentioned above) are set and answered through the medium of English. School textbooks from Std 3 upwards, in all subjects, are written in English. It is fairly safe to assert, therefore, that English should be the language life of the Higher Primary and Secondary School classroom. In 1953 a UNESCO report of proceedings of a conference held in 1951 maintained that the best medium for teaching a pupil was that of the mother-tongue. The report pleaded for mother-tongue instruction to be extended to as late a stage as possible in a pupil's school life (UNESCO 1953). While such a plea may be grounded on sound psychological and pedagogical reasoning, it is often ignored because of the realities existing within the educational system. The R.S.A. and the T.B.V.C. states are a case in point for as I have already mentioned, examinations, textbooks, and for that matter tertiary education at the post-matriculation level, all employ English as instructional medium. Pragmatism carries the day and the black pupil is compelled to use English. Other factors applicable to the South African context are the existence of many different ethnic groups, each with its own language, and the fact that a shortage of qualified and experienced teachers in many subjects and different levels within the schools has meant that often teachers whose first language is English are involved in teaching pupils from these various language groups
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- Date Issued: 1987
A comparison of nesting behaviour and prey selection in some Southern African species of Ammophila (Hymenoptera : Sphecidae)
- Authors: Weaving, Alan James Shelley
- Date: 1987
- Subjects: Hymenoptera
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5600 , http://hdl.handle.net/10962/d1002050
- Description: Nesting behaviour and prey selection was compared in eight species of Ammophila. The frequent sympatry of these species was a central point of interest in the study. Nest siting differed markedly in several species. A. ferrugineipes, A. dolichodera, A. dolichocephala and, probably, A. conifera nested mostly in open habitats, this being regarded as the most common situation for the majority of Ammophila. A. beniniensis was unusual in nesting in well vegetated habitats, A. vulcania doing so amongst small clumps of vegetation in otherwise open habitats. A. insignis nested in vertical banks or old animal burrows and A. braunsi utilised abandoned burrows of other wasps situated in non-friable clay soils. This is the first time such nest siting has been reported for Ammophila and each of these two species is consequently unique. Many aspects of nest construction behaviour, in particular methods of soil waste disposal, sealing of nests and their final coverage, differed interspecifically, in some cases intraspecifically, but often apparently in response to the habitat. With regard to nest provisioning strategies, all species hunted after digging their nests, except A. dolichodera which is the first Afrotropical Ammophila reported to hunt before excavating its nest. This brings the total number of the world's species of Ammophila showing this behaviour to three. This species, A. beniniensis, A. braunsi and A. vulcania provided one caterpillar per nest; the others supplied several, A. insignis being the only mass provisioner. A. ferrugineipes showed a form of progressive provisioning and maintained several nests at a time; it is the only Afrotropical species known so far to do so. Only two extra-limital species have been reported showing similar behaviour. The observed variations in provisioning strategies can most easily be explained in relation to the habitat. Investigation of prey selection showed that there was very little interspecific overlap in the species of caterpillars used for provisioning nests. This was shown to be due mainly to differing hunting habitat preferences. The various overall patterns of nesting behaviour, and variations in the different components within these patterns, were considered most likely to have resulted from allopatric speciation in different types of vegetation, the more advanced patterns arising in open habitats. The frequent occurrence of sympatry appears to be a reflection of a shifting distribution of mosaic patterns of vegetation types and the post-speciation spread of species. This influence of habitat on behaviour and prey selection has emphasised the need for caution in drawing phylogenetic conclusions from ethology. Further, these considerations provide an alternative to competition in attempting to explain the observed behaviour patterns and distribution of these wasps.
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- Date Issued: 1987
A machine-independent microprogram development system
- Authors: Ward, Michael John
- Date: 1987 , 2013-03-11
- Subjects: Microprogramming
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4581 , http://hdl.handle.net/10962/d1003738 , Microprogramming
- Description: The aims of this project are twofold. They are firstly, to implement a microprogram development system that allows the programmer to write microcode for any microprogrammable machine, and secondly, to build a microprogrammable machine, incorporating the user friendliness of a simulator, while still providing the 'hands on' experience obtained actual hardware. Microprogram development involves a two stage process. The first step is to describe the target machine, using format descriptions and mnemonic-based template definitions. The second stage involves using the defined mnemonics to write the microcodes for the target machine. This includes an assembly phase to translate the mnemonics into the binary microinstructions. Three main components constitute the microprogrammable machine. The Arithmetic and Logic Unit (ALU) is built using chips from Advanced Micro Devices' Am29ØØ bit-slice family, the action of the Microprogram Control Unit (MCU) is simulated by software running on an IBM Personal Computer, and a section of the IBM PC's main memory acts as the Control Store (CS) for the system. The ALU is built on a prototyping card that plugs into one of the slots on the IBM PC's mother board. A hardware simulator program, that produces the effect of the ALU, has also been developed. A small assembly language has been developed using the system, to test the various functions of the system. A mini-assembler has also been written to facilitate assembly of the above language. A group of honours students at Rhodes University tested the microprogram development system. Their ideas and suggestions have been tabulated in this report and some of them have been used to enhance the system's performance. The concept of allowing 'inline' microinstructions in the macroprogram is also investigated in this report and a method of implementing this is shown.
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- Date Issued: 1987
Die dood, die minnaar en die oedipale struktuur in die Ingrid Jonker-teks
- Authors: Van Wyk, André Johan
- Date: 1987
- Subjects: Jonker, Ingrid, 1933-1965 -- Criticism and interpretation Afrikaans poetry -- History and criticism
- Language: Afrikaans
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3608 , http://hdl.handle.net/10962/d1003917
- Description: From Inleiding: In dié inleiding word die implikasies van die woord "teks", asook die resepsie van die Ingrid Jonker-teks in die lig van haar dood, en 'n eie benaderingswyse, in teenstelling met die tradisionele kritiese metodes, bespreek. 1.1 Die teks: Die Ingrid Jonker-teks behels (met die dood, die rninnaar en die OedipaIe struktuur as uitgangspunt) aIIes waarop die woorde "Ingrid Jonker", as teks - die parentese tussen die datums op haar grafsteen - dui. Dit beteken dat genre-onderskeidinge en die onderskeid biografie en literatuur opgehef word. Verdere implikasies van die woord "teks" gaan vervolgens ter inleiding ondersoek word. Daar sal ruim gebruik gemaak word van die literêr-teoretiese en filosofiese veronderstellinge van Julia Kristeva, Maurice Blanchot, Jacques Derrida, Jacques Lacan, Pierre Macherey en Roland Barthes.
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- Date Issued: 1987
An investigation into the dimensions underlying the success and failure of new consumer products in South Africa
- Authors: Tucker, Alison
- Date: 1987
- Subjects: Consumer behavior -- South Africa , Consumer satisfaction , New products -- South Africa , Marketing -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1190 , http://hdl.handle.net/10962/d1004448
- Description: From Introduction: While companies in their initial stages may well produce only one product, most established companies produce a number of products. Reference can therefore be made to their product mixes which serve as their source of revenues and profits. The product mix must be carefully planned. Inherent in such planning is the monitoring of the mix to determine whether or not it strikes a good balance in terms of factors such as sales growth, sales stability and profitability. The product mix must be optimal vis-a-vis the opportunities and threats present in the external environment at any point in time. Since the latter changes over time, so too should the product mix change in order to maintain the required balance between the environment and the product mix, as well as the required balance in terms of sales growth, sales stability and profitability.
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- Date Issued: 1987
The tectono-metallogenesis during the irumide and pan-African events in South West Africa/Namibia
- Authors: Tregoning, Trevor Denzil
- Date: 1987 , 2013-03-05
- Subjects: Orogeny -- Namibia , Ore deposits -- Namibia , Mines and mineral resources -- Namibia , Geodynamics , Rifts (Geology) -- Namibia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4922 , http://hdl.handle.net/10962/d1004490 , Orogeny -- Namibia , Ore deposits -- Namibia , Mines and mineral resources -- Namibia , Geodynamics , Rifts (Geology) -- Namibia
- Description: A large portion of South west Africa/Namibia is underlain by 2 great orogens. They are the Irumide (Sinclair/Rehoboth) and Damara Orogenies. The L-shaped Irumide Province forms part of a belt which extends over the subcontinent from Namaqualand to as far as Zambia. The volcano-sedimentary sequences of the Irumide are believed to have formed in intracratonic rifts and pull-apart basins during the period 1400 to 900 Ma. The evolution of the NW trending Sinclair Group proceeded by means of 3 major cycles each beginning with the emplacement of basic to intermediate magmas followed by felsic ones. The cycle ended off with subsidence, deposition of immature clastic debris and final tilting of the volcano-clastic sequence. It was suggested that the extensive calc-alkaline lavas present, developed within a magmatic arc above a subduction zone, but this proposal has not been generally accepted. The NE trending Klein Aub-Witvlei Basins consist essentially of red bed alluvial fans and lacustrine sediments with minor volcanics near the base. The red beds and aeolian sediments were deposited in an arid climatic condition. The regional greenschist facies metamorphism and deformation is attributed to a major tectono-thermal event at 1100 Ma. The Damara Orogen (900 - 550 Ma) forms part of the Pan-African mobile belt system of global proportions. The NE trending intracontinental branch (aulacogen) and 2 coastal branches constitute a triple junction with its focal point near Swakopmund. The NE extension of the intracontinental belt has been linked with the Lufilian Arc hosting the renown Zambian Copper Belt deposits. In South West Africa/Namibia this belt hosts many different mineral occurrences which can be grouped into rift and collision related deposits. The tectonic history of the Damara Orogen supports a geodynamic-evolution-with-time hypothesis and represents a transitional phase in which limited Wilson Cycle Tectonics was active. The Theory of Mantle Advection is invoked to explain rifting, thinning and subsidence. Extensive ensialic rifting resulted in a relatively stable Northern Carbonate Platform and several deep troughs hosting turbiditic sequences. Crustal rupture in the Khomas Trough allowed for the emplacement of ocean floor tholeiites known as the Matchless Amphibolite Belt. Subsequent ocean closure and collision resulted in deformation, metamorphism and generation of predominantly S-type granites. The southern continental plate was partially overridden by the northern plate during final collision at 550 Ma. These low angle thrust faults allowed for the emplacement of the Naukluft Nappe Complex on top of younger Nama sediments. The break up of Gondwanaland during the Mesozoic with the splitting of the Atlantic Ocean was responsible for the intrusion of anorogenic alkaline ring complexes along the extension of the NE trending transform faults within the intracontinental branch of the Damara Orogen. A close relationship between the tectonic setting and mineral deposits has been recognized in both the Irumide and Damara Orogenies. In the Irumide, stratiform syngenetic copper deposits are hosted by alluvial fan, playa and lacustrine sediments. The uninterrupted sedimentation from the Irumide to Damara Orogen resulted in similar stratiform copper deposits during the early stages of rifting. In the Damara Orogen the rifting (extensional) phase is characterized by 4 main mineralizing systems: diagenetic/syngenetic (Kupferschiefer-type), epigenetic/hydrothermal Cu-Pb-Zn (Mississippi Valley-type), volcanogenic cupriferous pyrite (Besshi-type) and volcano-exhalative Pb-Zn (Red Sea-type). The collision (compressional) phase was accompanied by 4 main mineralizing processes: epigenetic/hydrothermal Cu-Pb-Zn, hydrotheral/metasomatic Sn-W-rare earth, metamorphogenic Au and U-bearing anatectic melts. The key to the selection of viable exploration targets lies in the understanding of the field evidence and the geodynamics modelling to explain the evolution of the orogen and its associated mineral deposits.
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- Date Issued: 1987
A structural study of the capsular antigens of escherichia coli K36 and klebiella K68
- Authors: Stanley, Shawn Mark Ross
- Date: 1987 , 2013-03-11
- Subjects: Enterobacteriaceae , Klebsiella , Escherichia , Antigens
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3814 , http://hdl.handle.net/10962/d1004613 , Enterobacteriaceae , Klebsiella , Escherichia , Antigens
- Description: From Introduction: Bacterial cells all have a cytoplasmic membrane (see Figure 1) which regulates the movement of ions and molecules into and out of the bacterium. Enclosing this membrane is a cell wall of which there are two general types, which are differentiated by the Gram stain(02) as being either gram positive or gram negative (depending upon whether they hold the gram stain after washing with ethanol). The cell wall provides the cell with shape and rigidity and is composed, in the case of gram positive types, of peptidoglycan, and in the case of gram negative bacteria, of a peptidoglycan and an outer membrane (see Figure 2). The peptidoglycan layer, common to both cell wall types, consists of a backbone of alternating units of N-acetylglucosamine and N-acetylmuramic acid to which peptides are attached by amide links. This heteropolymer is a highly cross linked mosaic and this gives it strength and rigidity. In gram positive bacteria, this layer also contains two carbohydr ate antigens, a simple polysaccharide and a teichoic acid; these are usually the type specific or major group antigens of the bacterium. Many of the bacteria also produce exopolysaccharides (see Figure 3) either as discrete capsules (for example, the Enterobacteriaceae K antigens) or unattached slime layers (for example, the Enterobacteriaceae M antigens). The vast majority of these polysaccharides are heteroglycans(03) composed of contiguous oligosaccharide repeating units. Their monosaccharide components are largely neutral hexoses, 6-deoxy hexoses and also amino sugars. (03) Pentose units are rare. (03) The capsular polysaccharides usually have a high content of acidic constituents such as uronic acids, phosphate groups, or pyruvate ketals. (01) , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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- Date Issued: 1987
Funeral rites of the amaXhosa as therapeutic procedures compared to crisis intervention : an anthropological-descriptive evaluation
- Authors: Solomon, Angela Ntombizodwa Nokuphila
- Date: 1987
- Subjects: Xhosa (African people) -- Funeral customs and rites , Xhosa (African people) -- Psychology , Bereavement -- Psychological aspects , Mourning customs -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3164 , http://hdl.handle.net/10962/d1007699
- Description: This study was undertaken in an attempt to investigate the analogy between the Crisis Intervention Model and the Funeral Rites of the amaXhosa. The latter group includes both traditional as well as Western Christian elements. The study was confined to the geographical area of Ciskei and more specifically the villages in and around Peddie and Ndevana near Zwelitsha, as regards traditional people, and the Black townships of Zwelitsha and Whittlesea,as regards more Westernized people. It is, however, the contention of the study that experiences discussed here are common to Blacks in South Africa irrespective of ethnicity. The justification for this generalisation is based on anthropological commonalities as well as historical vicissitudes among Blacks in Southern Africa. For instance, ritual slaughter performed after death in propitiation with the ancestors is known among all Blacks in South Africa. Also the Politico-historical events as well as socio-economic developments in the country affect Blacks in a more or less similar manner. For example, the changing family structure among Blacks, because of changes from one type of economy to another, is a social process affecting all Blacks in Southern Africa - in particular the working class (Colin Murray, 1980). The Funeral rites under study are postulated as possessing elements of therapeutic and practical value which result in the alleviation of grief and the encouragement of full acceptable means of mourning. The study is chiefly descriptive and anthropological material has been used. Recordings were made from participant observation whenever there was a funeral in the area studied. Information about funerals is easily obtainable as these are announced over Radio Ciskei and Radio Xhosa every evening. Mourners and interveners were interviewed. The former to elicit the needs they had felt, the latter to elicit the needs they had perceived the former to have. The Crisis Intervention Model is fairly simple to understand and uses practical theory. Therefore, it is not surprising that there should be elements of similarity between this model and the funeral rites of the amaXhosa as both deal with people in need of support. These funeral rites are rooted in a culture which has as one of its crucial aspects intimate, face-to-face interaction of its members in constant exchange as regards both emotional support and services. These "credit networks" ensure that a person is never bereft of emotional support. Moreover, temporary services are always accorded to a person in crisis. An effort has been made to relate the Crisis Intervention Model to the South African context of Blacks (both traditional as well as Christian). By necessity this has meant looking at all cultural dimensions of Black society - historical, political, economic and cultural, in order to provide a clearer picture of the people under study. That is, human psychological experiences of grief and mourning are seen as processes related to and developing within the concrete everyday realities. Some of the experiences described have been personally witnessed by the researcher in her personal involvement with cultural practices. Funerals are, of necessity, sad occasions and this study, using participant observation methods sometimes brought on sad memories of the researcher's own losses of loved ones. In the discussion a comparison was made between the traditional methods of grief work, the Crisis Intervention theory and the mourner studied and it was found that these rites do indeed, contain therapeutic and practical elements of dealing with grief and mourning, comparable to the Crisis Intervention Model. Finally in the conclusior a proposal for further areas of study in this field was suggested.
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- Date Issued: 1987
The geology and alteration/mineralization of the Van Rooi's vley W/Sn deposit, Namaqua metamorphic complex, South Africa
- Authors: Smithies, Robert Hugh
- Date: 1987 , 2013-03-01
- Subjects: Mineralogy -- South Africa , Geology -- South Africa -- Namaqualand
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4924 , http://hdl.handle.net/10962/d1004526 , Mineralogy -- South Africa , Geology -- South Africa -- Namaqualand
- Description: Scheelite, wolfram Ite and cassIterIte mIneralizat ion is hosted wIthin numerous quartz-tourmaline-feldspar-fluorite veins at Van Rooi's Vley, N.W. Cape Province . MineralizatIon and hydrothermal alteration within, and around, these veins is hIghly complex and reflects the intricate interaction of hydrotherma l activity upon a structurally deformed sequence of ProterozoIc med ium to high-grade gneisses. Four distinct stages of alteration and mineralization occurred, including a l ate 'epithermal stage'. Although the location of mineralization was strongly controlled by st ructure, the concentration of mineralizati on was controlled by physicochemical variables, of which host-rock geochemistry was particularly important . Further W/Sn mineralization occurs on a local scale, some of which is spatia lly related to minor leucogranite dykes. Leucogranite bodies are not uncommon within the region and some are enriched in Wand Sn. By comparing FIB ra tio s,W/Sn ratios, the alteration mineralogy, the ore mineralogy and the Fe-content of tourmaline, the deposits within the Van Rooi's Vley area can be placed into a 'proximal' to 'distal' classification, with respect to a common source of mineralizing hydrothermal fluids. The Van Rooi's Vley deposit, whilst affiliated to greisen-style deposits, represents a ' distal' quartz-vein lode deposit. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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- Date Issued: 1987
A study of alienation and personality traits conducted among "Coloured" and white males in South Africa
- Authors: Shaw, Patrick Donovan Richard
- Date: 1987
- Subjects: Alienation (Soclal psychology) Alienation (Social psychology) -- Case studies -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3120 , http://hdl.handle.net/10962/d1004928
- Description: A measure of four types and five contexts of alienation, as well as ten personality traits, was obtained via the ·application of the Alienation Test and Howarth's Personality Questionnaire. The sample (~= 195) comprised of both high school pupils and adults drawn from the local population of English and Afrikaans speaking Whites and "Coloureds" from a town in the Eastern Cape of South Africa. These six sample groups allowed for comparisons on the measures for factors such as race, age and cultural differences. The literature review showed repeated reference to the "alienation" of the "Coloured" people of South Africa in the political, social and cultural spheres. However, the research in this area has been sparse. The main object of the study, therefore, was to determine if "Coloureds" do feel alienated, as well as the contexts of this alienation, using Whites as a comparative group. possible differences in personality traits between "Coloureds" and Whites have been associated with the differences in behaviour exhibited by these two groups, but past research has failed to find many differences. The second objective of this study, therefore, was to determine if there are differences between the personality traits of "Coloureds" and Whites, and to extend the past research. Researchers have shown that there is a relationship between alienation and personality traits, but have not adequately addressed the nature of this relationship or its implications. Following from this, the third objective of the study was to examine the relationship between alienation and personality traits, as well as their ability to predict alienation. Results on the Alienation Test showed that "Coloureds" do differ significantly from Whites and exhibit far higher levels of alienation. These differences are most marked on those types and contexts of alienation reflecting a distance from the social and political environment. Results on the personality measure showed minimal differences in personality traits between the groups. Where they were evident, they could be attributed to environmental factors. Lastly, there was a relationship between alienation and certain personality traits, but these traits had limited power to predict alienation. Taking all findings of the study into account, it is evident that the social environment, and specifically a discriminatory social environment, affects feelings of alienation to a far greater extent than personality traits. In addition, the large differences in scores of the "Coloured" and White groups on the measure of alienation and the minimal differences on the measure of personality, provides evidence that what is measured by alienation and what is measured by personality traits, are two distinctly different constructs.
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- Date Issued: 1987
Self-esteem and aggressive behaviour: a pilot study
- Authors: Rossouw, Gabriel Johannes
- Date: 1987
- Subjects: Aggressiveness , Self-esteem
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3151 , http://hdl.handle.net/10962/d1007471 , Aggressiveness , Self-esteem
- Description: From Introduction: "That man is an aggressive creature will hardly be disputed. With the exception of certain rodents, no other vertebrate habitually destroys members of his own species. No other animal takes positive pleasure in the excercise of cruelty upon another of his kind" (A. Storr, 1968 p. ix). It is a sombre fact that man is the cruellest and most ruthless specie that has ever walked on earth. We recoil in horror when we read the daily newspaper or in a history book of the atrocities committed by man, but as A. Storr puts it: "....., we know in our hearts that each one of us harbours within himself those savage impulses which lead to murder, to torture and to war." (p. ix). Our warranted concern with this phenomenon is portrayed by the tremendous amount of research in this field which can be sub-divided into two distinct categories. The first category consist of those that emphasize nurture in their attempt to gain a deeper understanding of human aggression, of which the behaviourists and social learning theorists are staunch supporters. Underlying their concern and endeavour is the personal belief that aggression is attributable to environmental factors. In short, they maintain that humans are not aggressive by nature and if one follows their argument to its logical conclusion it would allow for a sigh of relief and inspiration. Their research results indicate that well deliberated methods of control would most certainly result in the extinction or near extinction of aggression. The second category consist of those, notably the psycho-analytic school of thought, who emphasize nature in their understanding of human aggression and do not allow themselves the naivety of projecting aggression into environmental conditions and situations. In short, they argue that aggression is innate and serves a particular function in the psychological development of the human being. It is their contention that aggressiveness supports the individual in his drive towards independence. The aim of this paper is to present both stances and to broaden the perspective by introducing a view that straddles both nature and nurture. Following this view, of whom Rollo May (1972) is a strong supporter, to its logical conclusion would indicate that aggression is the result of nature as well as nurture and that it serves the function of re-establishing a sense of worth and significance that has otherwise been thwarted. Finally, this paper sets out to prove that aggression and violence "feeds on a low self- esteem and self-doubt" (Toch. 69, p. 212).
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- Date Issued: 1987
Studies on the gastric proteases in three South African snake species
- Authors: Robertson, Sirion Sholto Douglas
- Date: 1987
- Subjects: Snakes -- South Africa Proteolytic enzymes Pepsin Pepsinogen
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4063 , http://hdl.handle.net/10962/d1004639
- Description: The pepsinogens and pepsins of cobra, mole snake and puff adder have been studied. The pepsinogens of all three species fall into two distinct groups, here designated PI and PII. At least the latter group, in all cases, shows substantial microheterogeneity. Physicochemical studies suggest that the cobra and puff adder PII groups are more similar to each other than either is to the mole snake PII group. Kinetic studies indicate that, in the cobra and mole snake, the PI and PII pepsins differ in their Arrhenius activation energies. Such difference is smaller, or absent, in the case of the puff adder PI and PII pepsins. These characteristics of the pepsins are assessed in the context of the differences between the oral secretions of the three species studied. The suggestion is advanced that the puff adder's strongly proteolytic venom has influenced certain properties of its gastric proteases.
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- Date Issued: 1987
A revision of the genus Rafnia thunb.(fam. Fabaceae : sub. fam. Papilionoideae)
- Authors: Richardson, Gaynor Rose-Marie
- Date: 1987
- Subjects: Thunbergia -- Classification
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4237 , http://hdl.handle.net/10962/d1004746 , Thunbergia -- Classification
- Description: A taxonomic revision of Rafnia Thunb. (Fam. Fabaceae, Subfam . Papili onoideae) is presented in which 21 species are recognised. The relative value of the taxonomic characters is discussed. An electron microscopy study of the seed surface, pollen grains and several sexual characters has been undertaken. Two keys are included , one using vegetative and floral characters and the other using ultrastructure of the testa. Each species description is accompanied by illustrations and a distribution map. Historical and ecological notes on the genus are given
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- Date Issued: 1987
Gold metallogeny of Australia
- Authors: Rankine, Graham M
- Date: 1987
- Subjects: Gold ores -- Geology -- Australia , Gold mines and mining -- Australia , Gold -- Metallurgy -- Australia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4928 , http://hdl.handle.net/10962/d1004676
- Description: The gold metallogeny of Australia is predominantly confined to the Archaean and Palaeozoic Provinces. The Archaean gold occurrences are predominantly hosted in ultramafic-mafic dominated greenstone belts, with less associated tofelsic-volcanic and sedimentary sequences. Most gold occurrences are confined to shear zones or faults, and adjacent discoveries of economic laterite-hosted deposits, host rocks. Recent are presently under investigation and will supply a significant proportion of production in the future. The Proterozoic gold deposits of Australia , are confined to geosyncinal sequences, commonly turbidites (eg: Telfer), with other hydrothermal deposits associated directly to granites. An important feature of the North Australian Craton deposits, is the spatial association of most deposits to granite bodies, although a genetic link has not been established conclusively. The Roxby Downs deposit in South Australia is a unique occurrence of gold in association to copper, uranium and R.E.E. This deposit is tentatively related to intraplate alkaline-magmatism, with further work necessary. The most significant recent discovery of gold mineralization in Australia is in the Drummond Basin in Queensland. This epithermal is tentatively related to mineralization within the Georgetown Inlier. The latter mineralization is Permo-Carboniferous, in a Proterozoic (and possibly Archaean) sequence of schists. It is tentatively suggested that all the gold mineralization in northern Queensland may be related to single tectonic event, a feature which requires further study . Other mineralization in the Phanerozoic includes the turbidite-hosted metamorphogenic deposits of Victoria, the rift related deposits in New South Wales and magmatic related deposits in Queensland. The gold deposits in Australia may in the future be classified in a tectonogeological framework, similiar to the layout of this dissertation, particularly once further data becomes available on recent discoveries.
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- Date Issued: 1987
The piano sonatas of Muzio Clementi: an investigation into compositional aspects with special emphasis on developments in form and style
- Authors: Radloff, T E K
- Date: 1987
- Subjects: Clementi, Muzio, 1752-1832 -- Sonatas, Piano
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2653 , http://hdl.handle.net/10962/d1002319
- Description: This thesis follows on a number of studies all of which deal with selected schools of composition important in the development of the piano sonata. Muzio Clementi was one of the leading contemporaries of such great masters as Haydn. Mozart, Beethoven and Schubert, all of whom contributed greatly to the repertoire of piano sonatas. During his lifetime his reputation equalled that of his contemporaries and many of his sonatas were greatly admired by the young Beethoven. Clementi was born in Rome but spent the largest part of his Ii in London where he established himself as a multi-faceted musician, being engaged in many different fields connected with music: composer, teacher, performer, publisher and manufacturer of pianos. His sonatas form the most important part of his total creative output. While the earli works still follow principles typical of the middle classical period, his later sonatas belong to a different era and foreshadow the coming of romanticism. This thesis is devoted to a detailed survey of the changes that affect the form of the various movements. It shows the gradual change from tile simple compositional methods of the early works to the inherent logical process that characterises the sonatas of the later years The first part of the thesis culminates in findings that prove Clementi IS individuality and show that his enquiring spirit makes him an innovator of the first rank. The second major part of the thesis deals with the stylistic changes that take place within the various periods of Clementiis creative life. It summarises the main ingredients of his early music, critically evaluates the importance of various pianistic devices that play a leading role in works of the middle periods and finally shows the successful blending of inherited and new techniques in the last sonatas. The concluding section details the major points of the preceding investigations and presents a picture of Clementi's personality as it emerges through the medium of his solo keyboard sonatas.
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- Date Issued: 1987
Anorogenic alkaline ring-type complexes of the Damaraland Province, Namibia, and their economic potential
- Authors: Potgieter, J E
- Date: 1987
- Subjects: Alkalic igneous rocks -- Namibia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4907 , http://hdl.handle.net/10962/d1001567
- Description: Anorogenic alkaline ring-type complexes form within continental plate settings. Alkaline magmatism is derived from the upper mantle, in which mantle metasomatism plays an important part, as well as from partial melting of the lower crust. Radial and concentric fractures develop during the ascent of alkaline magma. Extrusion of basic and felsic magma takes place along these fractures with felsic volcanics building-up central volcanoes. As a result of emptying of the magma chamber, the superstructure of the volcano collapses and a caldera is formed. During the caldera stage syenitic and granitic material are intruded into ring fractures. Alkaline ring-type complexes may be classified as (i) alkaline qranite and syenite-type and (ii) carbonatite and undersaturated-type. These ring-type complexes occur as distinct igneous provinces. Some major provinces occur in Brazil, Corsica, Namibia, Nigeria, Norway, Saudi-Arabia and Sudan. In Namibia the Damaraland igneous province is of Mesozoic aqe and it contains 15 alkaline ring-type complexes . These complexes are situated along north-eastern trends which correspond to transform directions of the South Atlantic. During the opening of the South Atlantic (Gondwana breakup) Pan-African age lineaments were reactivated which allowed emplacement of anorogenic alkaline magmatism. A zonation of alkaline granite and syenitetype in the west and carbonatite and undersaturated-type ring-complexes in the east correlates with down- and upwarp axes parallel to the line of Gondwana fragmentation. Alkali- and H⁺-metasomatism is related to the alkaline and syenite-type whereas alkali metasomatism (fenitization) is associated with carbonatite and undersaturated-type ring-complexes. Sn, W and Ta mineralization is associated with alkaline granites of some of the alkaline granite and syenite-type ring-complexes. Fe, F, PO₄ , Nb, Th, REE, Sr, Zn and Pb mineralization is associated with carbonatite complexes. Potential exists for: (i) porphyry Cu-Mo and epithermal-type (Au, Ag, Pt-metals, base metals) mineralization in the alkaline granite and syenite-type ring-complexes and (ii) disseminated Cu, Au, Aq and Pt-metals in carbonatite and undersaturated-type ring-complexes
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- Date Issued: 1987
The acquisition of reading skills in English by coloured primary school children whose home language is Afrikaans : a developmental study conducted in a specific South African community
- Authors: Pitt, Joe Harrison
- Date: 1987
- Subjects: Reading (Primary) -- South Africa Reading (Elementary) -- South Africa English language -- Study and teaching (Primary) -- Afrikaans speakers English language -- Study and teaching -- South Africa -- Foreign speakers
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2338 , http://hdl.handle.net/10962/d1002020
- Description: This research studies the acquisition and development of specific reading skills in English by "Coloured" primary school children for whom English is a second language. This study involves both oral and silent reading research. Developmental trends in both modes of reading are compared with those established for reading in Afrikaans in order to ascertain whether any transfer takes place from Afrikaans to English. For analysis of data obtained from oral reading, this researcher adopted an error analysis method devised by Kenneth Goodman (1973), viz. Miscue Analysis (MA). Readers read a passage and their miscues were recorded. From the miscues this researcher established, for the different standards: the frequencies of miscues; readers' ability to associate sound and symbol; sensitivity to grammar; meaning access; and correction strategies. In the silent reading research, readers' performances in a test battery of eight sub-tests provide insights into the presence or absence of information processing skills. Readability levels (Singer and Donlan (1980), discrimination index and facility value (Heaton 1975), and Chi-Square Statistics (Roscoe 1969) determine the development of specific reading skills, viz.: utilization of textual cues; understanding cause and effect relationships and sequence; previewing and anticipation; scanning, referring and synthesizing; understanding text structure and coherence; understanding propositional development; understanding synonymy and antonimy; and understanding communicative value. Grellet (1981), Kennedy (1981), and Harri-Augstein (1982), inter alia, regard these skills as crucial to efficient text processing. Analyses of data show there are developmental patterns, but skills emerge 1 - 3 years late when compared with results obtained by Kennedy (1981 ) and develop at a retarded and erratic pace. The readers in all the standards have not mastered the skills sufficiently to process text efficiently. This research shows that Std 3 is a cut-off level where a transition takes place from lower-order to higher-order skills processing. In addition, Chi-Square Statistics show little transfer from Afrikaans to English; the skills develop independently in the two languages. Enquiry has identified various factors that influence skills deficiencies, viz.: syllabus prescriptions and problems of interpretation; teachers' understanding of the reading process and the methods employed; teacher-training progresses; materials prescribed for reading; and reading in the society. This research recommends ways in which short comings can be remedied
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- Date Issued: 1987
The exploration and evaluation of groundwater units south and west of Graaf-Reinet, Cape Province, South Africa
- Authors: Parsons, Roger Paul
- Date: 1987 , 2013-04-18
- Subjects: Hydrogeology -- South Africa , Aquifers -- South Africa -- Graaff-Reinet , Groundwater -- South Africa -- Graaff-Reinet
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4865 , http://hdl.handle.net/10962/d1007351 , Hydrogeology -- South Africa , Aquifers -- South Africa -- Graaff-Reinet , Groundwater -- South Africa -- Graaff-Reinet
- Description: The investigation reported in the thesis concerns an area south and west of Graaff-Reinet, in the Cape Province. The research projec t identified the existence of four groundwater units. The aquifers predominantly occur in Beaufort Group sediments and the boundary of each unit is formed by dolerite intrusives or with topographical highs. The objective of the study was to quantitatively assess these units in terms of both quantity and quality for possible future development as a municipal supply for Graaff-Reinet. In order to achieve the objective, fieldwork was carried out involving a hydrocensus, geological mapping, drilling, aquifer testing and hydrochemical sampling. The analysis of these data revealed that the Sundays and Kamdeboo aquifer units are unsuitable for further development. The Moordenaars and Swart units, both of which produce good quality water, have a combined exploitation potential in the order of 30 000 m³ /d. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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- Date Issued: 1987