List of Titles

An investigation into the sensory mechanisms underlying the two point threshold, with particular reference to the practice effect

- Gradwell, Peter Bertram

Authors: Gradwell, Peter Bertram
Date: 1971
Subjects: Sensorimotor integration , Perceptual-motor learning
Language: English
Type: Thesis , Masters , MA
Identifier: vital:3209 , http://hdl.handle.net/10962/d1012085 , Sensorimotor integration , Perceptual-motor learning
Description: The two point threshold was studied extensively by the psychophysical experimenters of the last century. More recent formulations in signal detection theory have suggested that the statements of these workers about absolute thresholds should be viewed with caution. This study investigates the two point threshold in the light of these formulations, and has two main aims :- (1) To state and deal with the problem of relating a limitation in perceptual ability, such as that which is represented by the two point threshold, to the receptor organisation of the body. (2) To demonstrate a practice effect on the two point threshold, and to consider this in the light of (1) above. To fulfil these two aims, a model of the neural mechanisms underlying the discrimination of two points applied to the skin is proposed, and this is able to accommodate what is known of the two point threshold. Although the model is simple it explicitly accounts for size transfer and the practice effect, and provides some clues as to the type of neural mechanism capable of producing them. The practice effect is demonstrated experimentally, and the results are then referred to the model proposed. The physiology of an organism sets the limits for its behaviour. 'The first aim is thus an important one, in that it considers a specific case of this general problem. And secondly, the practice effect on the two point threshold is typical of a number of fairly simple "learning" phenomena, which are part of the psychologists' study of learning.
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Date Issued: 1971

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Concerning most people

- Mann, Chris

Authors: Mann, Chris
Date: 1971
Subjects: To be catalogued
Language: English
Type: text , article
Identifier: http://hdl.handle.net/10962/459597 , vital:75845 , https://journals.co.za/doi/epdf/10.10520/AJA00284459_293
Description: New Coin is one of South Africa's most established and influential poetry journals. It publishes poetry, and poetry-related reviews, commentary and interviews. New Coin places a particular emphasis on evolving forms and experimental use of the English language in poetry in the South African context. In this sense it has traced the most exciting trends and currents in contemporary poetry in South Africa for a decade of more. The journal is published twice a year in June and December by the Institute for the Study of English in Africa (ISEA), Rhodes University.
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Date Issued: 1971

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Creative processes in young children

- Styles, Irene Mavis

Authors: Styles, Irene Mavis
Date: 1971
Subjects: Creative ability in children , Creative thinking
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:3244 , http://hdl.handle.net/10962/d1013327
Description: Enthusiasm for developing creativity in the individual has been remarkably widespread - at least in America - over the past twenty-five years or so. The armed services, the arts and sciences, educational institutions, businesses and industries are recognising to a greater and greater extent, the urgent necessity of developing this relatively neglected aspect of people is personalities. Their reasons differ, of course, and usually the welfare of the individual himself is not the main concern. This is perhaps fortunate, as advances made on philanthropic grounds alone have never progressed very rapidly. In business and industry, new ideas are urgently needed for survival - this was especially evident after World War II which was, in the end, really a battle of ideas. The importance of this implication has not decreased with distance in time from that conflagration, indeed, individuals in the armed services are probably the people most deeply involved in and the most concerned with the problem of developing creative thought. "We are in a mortal struggle for the survival of our way of life", writes Guilford. "The need (for developing creativity) is a national crisis" says Anderson*. Intro., p. 1.
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Date Issued: 1971

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Developmental studies of certain South African Ascostromatic ascomycetes

- Tim, Stephen K-M

Authors: Tim, Stephen K-M
Date: 1971
Subjects: Fungi -- Parasites Ascomycetes Pyrenomycetes -- South Africa
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:4245 , http://hdl.handle.net/10962/d1007289
Description: From General Introduction: Toward the last half of the nineteenth century, the structure and mode of development of the ascocarp has aroused much interest. De Bary (1887) recognised the fruiting bodies of the Ascomycetes as 'compound sporophores' made up of interwoven hyphae or of pseudoparenchyma consisting of a peripheral layer separate from an inner tissue. These fruiting bodies included the discocarp or apothecium, the pyrenocarp or perithecium and the cleistocarp or cleistothecium. The name, Pyrenomycetes, has been variously applied to a group of Ascomycetes but mainly to the perithecial types, inclusive of the true perithecia and the loculate forms. The perithecium itself was described as a 'cup-shaped discomycetous' sporocarp with margins incurved to form a pyriform structure (de Bary, 1887). The presence or absence of a stroma had been long considered as a basis for the separation of the major groups of the Ascomycetes. Separation on these grounds was found unacceptable as it grouped together clearly unrelated species or separated related ones. As the subdivisions of the pyrenomycetous Ascomycetes are dependent upon the morphological features of the ascocarp, it would be pertinent to discuss the following: a) The Stroma. b) The various forms of ascocarp which mayor may not be associated with such a stroma. i) Perithecia: free or immersed in a stroma. ii) Uni- or multiloculate stromata. c) The centrum, the details associated with the centrum and the use of these details in the taxonomy of the pyrenomycetes.
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Date Issued: 1971

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Die utopie und der deutsche utopische roman seit 1939

- Krueger, Gustav Adolf Ludwig Werner

Authors: Krueger, Gustav Adolf Ludwig Werner
Date: 1971
Subjects: German fiction -- 20th century , German literature -- History and criticism
Language: German
Type: Thesis , Masters , MA
Identifier: vital:3631 , http://hdl.handle.net/10962/d1012711 , German fiction -- 20th century , German literature -- History and criticism
Description: Wie bei jeder wissenschaftlichen Untersuchung stellt sich auch hier, bei einer Arbeit über den utopischen Roman, die Frage nach einer Begriffsbestimmung. In diesem Fall geht es um eine genaue Umreissung der Begriffe "Utopie", "Staatsroman", "Utopischer Roman" oder auch "Utopia-Roman", vorausgesetzt, dass man diese Begriffe überhaupt als Gattungsbezeichnungen zu benutzen gewillt ist. Intro., p. 1.
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Date Issued: 1971

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Ecological studies on the non-parasitic larval stages of some tick species in the Eastern Cape Province of South Africa (Acarina : ixodidae)

- Londt, Jason G. H. (Jason Gilbert Hayden), 1943-

Authors: Londt, Jason G. H. (Jason Gilbert Hayden), 1943-
Date: 1971
Subjects: Ticks -- Ecology -- South Africa -- Eastern Cape , Ixodidae -- Ecology -- South Africa -- Eastern Cape
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:5862 , http://hdl.handle.net/10962/d1012777 , Ticks -- Ecology -- South Africa -- Eastern Cape , Ixodidae -- Ecology -- South Africa -- Eastern Cape
Description: "Ticks have already been studied in our country and abroad. Progress in the field of taxonomy has probably been the most rapid and has culminated in a large number of papers and excellent monographs, but much more remains to be done. To produce an overall picture of the factors influencing the behaviour of the tick under natural conditions, studies have to be conducted on tick ecology and experimental physiology. We still have a lack of knowledge of host specificity, the selection of feeding sites on hosts and the nature of resistance to attacks by ticks. Because of the varied habits of different species of ticks, the first essential prerequisite is an adequate knowledge of their biology." (Jansen 1969). The above words sum up the position of research on ticks in southern Africa at the present time.
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Date Issued: 1971

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Effects of vigilance decrement on the recognition of embedded figures

- Daniel, Robert David

Authors: Daniel, Robert David
Date: 1971
Subjects: Perception -- Testing , Cognitive psychology
Language: English
Type: Thesis , Masters , MA
Identifier: vital:3202 , http://hdl.handle.net/10962/d1010961
Description: Field independence was described by Witkin et al (1962) as the ability to separate an item perceived from its context. Here most experiments have used visually presented material where the subject was shown a simple geometrical figure and then a complex one containing the simple figure as part of it: the subject's task was to find and point out where the simple figure was hidden. Recent work has suggested that the skills involved in Witkin's tests might be associated with particular cultural backgrounds. This extension of Witkin's theory of field independence by Wober linked visual phenomena with those of a social and maturational nature: the ability to separate visual items from their context was shown to be aligned with the development of a sense of personal identity ; the person was considered to be an item set in a context or social field, be it family or society around him: an individual, depending on the way he was socialized as a child, may perceive the world analytically, if he did he was labelled field independent, if not he was field dependent. Intro. p.1.
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Date Issued: 1971

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Extractives of Leonotis and Euryops species

- Eagle, G A

Authors: Eagle, G A
Date: 1971
Subjects: Stereochemistry Leonotis -- Analysis Euryops -- Analysis Botanical chemistry
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:4465 , http://hdl.handle.net/10962/d1011610
Description: The isolation and structure determination of dubiin and leonitin, two new diterpenoid acetates from Leonotis dubia and Leonotis leonitis respectively, are discussed. The compounds are diterpenoids of the labdane type and are closely related to marrubiin. The proposed structures are based on chemical and spectral evidence. Dubiin, C₂₂H₃₀0₆̕ contains a tertiary hydroxy- group, a furan ring and a ó-lactone while leonitin, C₂₂H₃₀0₇̕ is a γ - dilactone. at C-20. Both compounds are unusual in being oxygenated The extraction of three Euryops species and the isolation of euryopsol, C₂₂H₃₀0₄̕̕ are also described. A furanoeremophilane structure containing three hydroxy- groups, one of which is at a bridgehead position, is proposed. Euryopsol is the first furanoeremophilanoid with a substituent attached at C-IO
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Date Issued: 1971

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In community in Christ: a study of theological setting of the sacraments in the New Testament

- Moore, Basil S

Authors: Moore, Basil S
Date: 1971
Subjects: Sacraments Sacraments (Liturgy)
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:1240 , http://hdl.handle.net/10962/d1007688
Description: Introduction: Neville Clark has rightly warned against the attempt to approach the theology of the sacraments from a broad and general definition of a 'sacrament' from which we 'read off' a Christian doctrine of the sacraments without paying due regard to the biblical statements. Such an approach could not but obscure the essential differences between the sacraments, and the fact that they stem from historical roots. On the other hand, the specialist treatment of the sacraments which begins by making a detailed analysis of the biblical material fails to do justice to the wholeness of biblical theology and tends to treat the sacraments in isolation not only from each other but also from other aspects of Christian theology with which they are inalienably connected. Bearing in mind the difficulties inherent in both of these approaches, a fresh and more systematic approach is required.
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Date Issued: 1971

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Ironie en ek : aspekte van die ironie as struktuurfaktor in die romanwerke van Marnix Gijsen

- Steyn, Karin

Authors: Steyn, Karin
Date: 1971
Subjects: Irony in literature , Gijsen, Marnix, 1899-1984 -- Criticism and interpretation , Dutch fiction -- 20th Century
Language: Afrikaans
Type: Thesis , Masters , MA
Identifier: vital:3635 , http://hdl.handle.net/10962/d1013287
Description: From Nawoord, p. 182. Ironie word in Gijsen se oeuvre nie alleenlik op 'n besondere wyse gebruik as 'n vorm van spel met woorde ter versiering of tot vermaak van die leser nie, maar irornie vorm ook 'n allerbelangrikste aspek van die struktuur van sy verhale. Gijsen "gebruik" nie in die eerste plaas ironie om die een of ander doel te bereik nie. Sy werke is ironies, en 'n begrip van die ironiese struktuur is in elke verhaal essensieel vir "n begrip van die verhaal self.
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Date Issued: 1971

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Proton conduction in organic solids

- Chan-Henry, Robert Yatshein

Authors: Chan-Henry, Robert Yatshein
Date: 1971
Subjects: Electrolytes -- Conductivity , Protons , Organic conductors , Organic solid state chemistry
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:4446 , http://hdl.handle.net/10962/d1007729 , Electrolytes -- Conductivity , Protons , Organic conductors , Organic solid state chemistry
Description: Dielectric, d. c. conductivity and electrolysis measurements have been made principally on solid imidazole and urea. Electrode effects, especially the development of a suitable protode, and techniques for detecting mobile protons in solids were pursued. The dielectric data have been correlated with the d. c. results. A mechanism for extrinsic proton conduction in urea has been proposed.
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Date Issued: 1971

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Some aspects of the effect of temperature on the respiratory and cardiac activities of the Cichlid Teleost Tilapia mossambica

- Josman, V

Authors: Josman, V
Date: 1971
Subjects: Fishes -- Effect of temperature on , Cichlids
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:5859 , http://hdl.handle.net/10962/d1012613
Description: The importance of the cichlid teleost Tilapia mossambica as a protein source, coupled with its remarkable adaptability, has resulted in its introduction into many water systems throughout the tropical, sub-tropical and even temperate regions of the world. However, its successful exploitation of these waters is dependent very largely upon the value of minimum temperatures and their duration. For e.g. Long et al (1961) has drawn attention to the tremendous mortalities of T. mossambica that occur in shallow water bodies during the precipitous temperature decreases that accompany the winter monsoons in Vietnam and other eastern countries, even at temperatures as high as 14 or 16º C. Coehe (1967) does not recommend stocking with T. mossambica where temperatures are not above 14º C all the time. Ailanson et al (1962) conclude, after an experimental study, that low temperatures (13º C or lower) in South African highveld dams in winter are certainly an important factor in the extensive mortalities of T. mossambica that have been reported from these dams. Jubb (1961) also reports that this species is often killed during a severe winter in Rhodesia. Intro., p.1.
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Date Issued: 1971

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Some aspects of the mission policy and practice of the Church of the Province of South Africa in Ovamboland, 1924-1960

- Mallory, Charles Shannon

Authors: Mallory, Charles Shannon
Date: 1971
Subjects: Church of the Province of Southern Africa -- Namibia -- Owambo
Language: English
Type: Thesis , Masters , MA
Identifier: vital:1232 , http://hdl.handle.net/10962/d1007312 , Church of the Province of Southern Africa -- Namibia -- Owambo
Description: This thesis is a study that was originally inspired by the question, "What does it mean to be a Christian in rural Africa today?" While the Church needs to ask this question everywhere in the world, from experience the writer believes it is especially germane to the non-Western cultures of Africa and Asia. That experience is drawn from eight years' work among the Kwanyama tribe of Ovambos in the Ovamboland Anglican Mission. Hence, this study is confined to one rural African tribe as it came under 46 years' influence of one Christian denomination.
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Date Issued: 1971

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