The psychological experience of being in hiding against the background of political repression in South Africa during the 1986 general State of Emergency: a phenomenological explication
- Authors: Scheepers, Esca
- Date: 1988
- Subjects: Violence -- South Africa -- Psychological aspects , South Africa -- Politics and government -- 1989-1994
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3111 , http://hdl.handle.net/10962/d1004586 , Violence -- South Africa -- Psychological aspects , South Africa -- Politics and government -- 1989-1994
- Description: This is a study in Critical Psychology which examines the psychological costs of one of the direct outcomes of political repression - the experience of being in hiding. The aims of the study can be depicted on two levels: it is first and foremost an attempt to provide a true account of the phenomenon of being in hiding. On a second level of equal importance it is an implicit and overt critique of the social order in which this phenomenon takes place. The psychological experience of being in hiding is examined and discussed in its proper socio-political context. Therefore, the theoretical part of the mini-thesis has a strong political bearing, focusing on the State, and extra-parliamentary opposition in South Africa. repression The empirical part of the mini-thesis explicates the psychological experience of being in hiding with the aid of the phenomenological method of investigation. Due to the lack of research on this or similar topics, it is discussed within the framework of the experience of a stressful life event. For the five subjects being in hiding was an extreme intervention which was imposed upon their existences and which brought about a qualitative transformation in the individual subjects mode of being-in-the-world - not only in terms of practicalities, but also on a deep experiential level. It was a phenomenon which touched on fundamental parts of their experience of themselves and their individual worlds and the way in which they actualized themselves. For them it essentially entailed a loss of relationships and roles which resulted in an experience of a measure of encapsulation or separation from the world of others . It was a profound, multi - dimensional disruption of the structure of the subject ' s existence which infused a rich emotional experience .
- Full Text:
- Date Issued: 1988
- Authors: Scheepers, Esca
- Date: 1988
- Subjects: Violence -- South Africa -- Psychological aspects , South Africa -- Politics and government -- 1989-1994
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3111 , http://hdl.handle.net/10962/d1004586 , Violence -- South Africa -- Psychological aspects , South Africa -- Politics and government -- 1989-1994
- Description: This is a study in Critical Psychology which examines the psychological costs of one of the direct outcomes of political repression - the experience of being in hiding. The aims of the study can be depicted on two levels: it is first and foremost an attempt to provide a true account of the phenomenon of being in hiding. On a second level of equal importance it is an implicit and overt critique of the social order in which this phenomenon takes place. The psychological experience of being in hiding is examined and discussed in its proper socio-political context. Therefore, the theoretical part of the mini-thesis has a strong political bearing, focusing on the State, and extra-parliamentary opposition in South Africa. repression The empirical part of the mini-thesis explicates the psychological experience of being in hiding with the aid of the phenomenological method of investigation. Due to the lack of research on this or similar topics, it is discussed within the framework of the experience of a stressful life event. For the five subjects being in hiding was an extreme intervention which was imposed upon their existences and which brought about a qualitative transformation in the individual subjects mode of being-in-the-world - not only in terms of practicalities, but also on a deep experiential level. It was a phenomenon which touched on fundamental parts of their experience of themselves and their individual worlds and the way in which they actualized themselves. For them it essentially entailed a loss of relationships and roles which resulted in an experience of a measure of encapsulation or separation from the world of others . It was a profound, multi - dimensional disruption of the structure of the subject ' s existence which infused a rich emotional experience .
- Full Text:
- Date Issued: 1988
The role of male competition and female choice in the mating success of a Lek-breeding Southern African Cichlid fish Pseudocrenilabrus Philander (Pisces: Cichlidae)
- Authors: Chan, Tin-Yam
- Date: 1988
- Subjects: Cichlids -- Africa, Southern -- Physiology Courtship in animals Fishes -- Reproduction Cichlids Pseudocrenilabrus philander Lek-breeding Courtship Reproduction Spawning Competition Rivalry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5599 , http://hdl.handle.net/10962/d1002049
- Description: A lek-breeding cichlid fish Pseudocrenilabrus philander was studied experimentally. Females in choice-chamber experiments showed no active choice for male size and colour, or for other male attributes, but preferred males which courted most actively. In a laboratory lek, the significant determinants of the strongly skewed mating success in males were territory size, side-shake and female chasing frequency. Together these three variables explained 79% of the variation in male mating success, with territory size alone accounting for 75% of the variation and the other two variables each accounting for 2% of the remaining variation. As there was no difference in territory quality in the laboratory lek, territory size became the principal measure of the effect of male-male competition since it was directly related to dominance. Both side-shake and female chasing could be identified as the basic factors influencing female choice, as they had an immediate effect on the display-response mating system of females. Thus, the relative importance of these three variables indicated that sexual selection in this particular lek mating species operated chiefly through the agency of intrasexual competition for dominance. However, both female behaviour and their requirement for a prolonged pre-spawning courtship had the effect of promoting male rivalry and favouring mating with dominant males. Although the intense male competition excluded subordinate males from practising normal courtship behaviour, competitively inferior males might "make the best of a bad situation" by facultatively adopting an alternative sneaking tactic to gain access to females. Spawning intrusions by females to steal freshly-laid eggs also occurred frequently. However, territorial males appeared to be relatively more tolerant of female intruders than male sneakers. Interference during spawning could lead to a longer pre-spawning courtship and even multiple-mating by females. The results of the present study and the behavioural evidence shown by males and females did not support the ʺrunaway selection modelʺ of the mating pattern in terms of sexual selection in leks, but conformed to the rival ʺwar propaganda modelʺ
- Full Text:
- Date Issued: 1988
- Authors: Chan, Tin-Yam
- Date: 1988
- Subjects: Cichlids -- Africa, Southern -- Physiology Courtship in animals Fishes -- Reproduction Cichlids Pseudocrenilabrus philander Lek-breeding Courtship Reproduction Spawning Competition Rivalry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5599 , http://hdl.handle.net/10962/d1002049
- Description: A lek-breeding cichlid fish Pseudocrenilabrus philander was studied experimentally. Females in choice-chamber experiments showed no active choice for male size and colour, or for other male attributes, but preferred males which courted most actively. In a laboratory lek, the significant determinants of the strongly skewed mating success in males were territory size, side-shake and female chasing frequency. Together these three variables explained 79% of the variation in male mating success, with territory size alone accounting for 75% of the variation and the other two variables each accounting for 2% of the remaining variation. As there was no difference in territory quality in the laboratory lek, territory size became the principal measure of the effect of male-male competition since it was directly related to dominance. Both side-shake and female chasing could be identified as the basic factors influencing female choice, as they had an immediate effect on the display-response mating system of females. Thus, the relative importance of these three variables indicated that sexual selection in this particular lek mating species operated chiefly through the agency of intrasexual competition for dominance. However, both female behaviour and their requirement for a prolonged pre-spawning courtship had the effect of promoting male rivalry and favouring mating with dominant males. Although the intense male competition excluded subordinate males from practising normal courtship behaviour, competitively inferior males might "make the best of a bad situation" by facultatively adopting an alternative sneaking tactic to gain access to females. Spawning intrusions by females to steal freshly-laid eggs also occurred frequently. However, territorial males appeared to be relatively more tolerant of female intruders than male sneakers. Interference during spawning could lead to a longer pre-spawning courtship and even multiple-mating by females. The results of the present study and the behavioural evidence shown by males and females did not support the ʺrunaway selection modelʺ of the mating pattern in terms of sexual selection in leks, but conformed to the rival ʺwar propaganda modelʺ
- Full Text:
- Date Issued: 1988
The selection and evaluation of grey-level thresholds applied to digital images
- Authors: Brink, Anton David
- Date: 1988
- Subjects: Image processing -- Digital techniques
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5443 , http://hdl.handle.net/10962/d1001996
- Description: Many applications of image processing require the initial segmentation of the image by means of grey-level thresholding. In this thesis, the problems of automatic threshold selection and evaluation are addressed in order to find a universally applicable thresholding method. Three previously proposed threshold selection techniques are investigated, and two new methods are introduced. The results of applying these methods to several different images are evaluated using two threshold evaluation techniques, one subjective and one quantitative. It is found that no threshold selection technique is universally acceptable, as different methods work best with different images and applications
- Full Text:
- Date Issued: 1988
- Authors: Brink, Anton David
- Date: 1988
- Subjects: Image processing -- Digital techniques
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5443 , http://hdl.handle.net/10962/d1001996
- Description: Many applications of image processing require the initial segmentation of the image by means of grey-level thresholding. In this thesis, the problems of automatic threshold selection and evaluation are addressed in order to find a universally applicable thresholding method. Three previously proposed threshold selection techniques are investigated, and two new methods are introduced. The results of applying these methods to several different images are evaluated using two threshold evaluation techniques, one subjective and one quantitative. It is found that no threshold selection technique is universally acceptable, as different methods work best with different images and applications
- Full Text:
- Date Issued: 1988
The sulphidization of mineral surfaces as applied to the froth flotation process
- Authors: Ramagwede, Mudzimba Hubert
- Date: 1988 , 2013-02-28
- Subjects: Sulfide minerals , Flotation
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4296 , http://hdl.handle.net/10962/d1004590
- Description: This work constitutes a fundamental study of the interaction between soluble sulphide,copper (II) oxide and cerussite particles in the presence of Ca²⁺ ,Mg²⁺ starch , gum arabic and Triton X- IOO . A detailed investigation of the effect of pH of the system on the rate of sulphide uptake was made . In addition , the structural form of the surface precipitat.es were determined with the aid of scanning electron microscopy . On the basis of these results , it was concluded that adsorption of sulphide on cerussite in the presence or absence of Ca²⁺ starch, gum arabic and Triton X-IOO could either lead to the formation of a non-uniform or a uniform sulphide layer depending on the experimental conditions . However , the interaction of copper (II) · oxide wi th soluble sulphide in the presence or absence of the above mentioned species always led to the formation or a non-uniform sulphide layer . Preliminary experiments of the interaction between xanthate and sulphidized surface showed that oxide surface covered with metal sulphide layer reacts with less xanthate than the free oxide surface.
- Full Text:
- Date Issued: 1988
- Authors: Ramagwede, Mudzimba Hubert
- Date: 1988 , 2013-02-28
- Subjects: Sulfide minerals , Flotation
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4296 , http://hdl.handle.net/10962/d1004590
- Description: This work constitutes a fundamental study of the interaction between soluble sulphide,copper (II) oxide and cerussite particles in the presence of Ca²⁺ ,Mg²⁺ starch , gum arabic and Triton X- IOO . A detailed investigation of the effect of pH of the system on the rate of sulphide uptake was made . In addition , the structural form of the surface precipitat.es were determined with the aid of scanning electron microscopy . On the basis of these results , it was concluded that adsorption of sulphide on cerussite in the presence or absence of Ca²⁺ starch, gum arabic and Triton X-IOO could either lead to the formation of a non-uniform or a uniform sulphide layer depending on the experimental conditions . However , the interaction of copper (II) · oxide wi th soluble sulphide in the presence or absence of the above mentioned species always led to the formation or a non-uniform sulphide layer . Preliminary experiments of the interaction between xanthate and sulphidized surface showed that oxide surface covered with metal sulphide layer reacts with less xanthate than the free oxide surface.
- Full Text:
- Date Issued: 1988
Theory in interpretive psychology - with special reference to Paul Ricoeur's interpretation of Freud
- Authors: Du Toit, Barry
- Date: 1988
- Subjects: Freud, Sigmund, 1856-1939 , Ricœur, Paul , Psychoanalysis
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2906 , http://hdl.handle.net/10962/d1002071
- Description: The thesis aims to show that, while an interpretive psychology is not compatible with theory as it occurs in the predictive- causal explanation of the natural sciences, it is both possible and necessary to develop a concept of theory valid within an interpretive methodology. These claims are advanced in the course of an examination of Ricoeur 's interpretation of Freudian psychoanalysis. After examining some traditional ways in which phenomenological psychology has responded to the psychoanalytic challenge, the thesis presents an interpretation of Freudian psychoanalysis as a hermeneutic approach which utilized theoretical constructions in a productive way, although distorted by Freud's natural-scientific self- understanding. Freud's causal-explanatory language and natural- scientific meta theory are shown to be significant inasmuch as they provide a vehicle for theory construction in psychoanalysis. However, since the theory is modeled on that of the natural sciences, it proves incompatible with the interpretive aspects of Freud's approach. We then establish a concept of theory and of causal analysis which is different to that of the natural sciences, and is compatible with, and indeed founded in, an interpretive approach to psychology. These concepts are then illustrated in the context of psychoanalysis. In the final chapter the advantages of the use of theory in interpretive psychology are discussed.
- Full Text:
- Date Issued: 1988
Theory in interpretive psychology - with special reference to Paul Ricoeur's interpretation of Freud
- Authors: Du Toit, Barry
- Date: 1988
- Subjects: Freud, Sigmund, 1856-1939 , Ricœur, Paul , Psychoanalysis
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2906 , http://hdl.handle.net/10962/d1002071
- Description: The thesis aims to show that, while an interpretive psychology is not compatible with theory as it occurs in the predictive- causal explanation of the natural sciences, it is both possible and necessary to develop a concept of theory valid within an interpretive methodology. These claims are advanced in the course of an examination of Ricoeur 's interpretation of Freudian psychoanalysis. After examining some traditional ways in which phenomenological psychology has responded to the psychoanalytic challenge, the thesis presents an interpretation of Freudian psychoanalysis as a hermeneutic approach which utilized theoretical constructions in a productive way, although distorted by Freud's natural-scientific self- understanding. Freud's causal-explanatory language and natural- scientific meta theory are shown to be significant inasmuch as they provide a vehicle for theory construction in psychoanalysis. However, since the theory is modeled on that of the natural sciences, it proves incompatible with the interpretive aspects of Freud's approach. We then establish a concept of theory and of causal analysis which is different to that of the natural sciences, and is compatible with, and indeed founded in, an interpretive approach to psychology. These concepts are then illustrated in the context of psychoanalysis. In the final chapter the advantages of the use of theory in interpretive psychology are discussed.
- Full Text:
- Date Issued: 1988
Towards a portable occam
- Authors: Hill, David Timothy
- Date: 1988 , 2013-03-07
- Subjects: occam (Computer program language) , Transputers , Parallel programming (Computer science)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4587 , http://hdl.handle.net/10962/d1004749 , occam (Computer program language) , Transputers , Parallel programming (Computer science)
- Description: Occam is designed for concurrent programming on a network of transputers. AIlocation and partitioning of the program is specified within the source code, binding the program to a specific network. An altemative approach is proposed which completely separates the source code from hardware considerations. Static allocation is performed as a separate phase and should, ideally, be automatic but at present is manual. Complete hardware abstraction requires that non-local, shared communication be provided for, introducing an efficiency overhead which can be minimised by the allocation. The proposal was implemented on a network of IBM PCs, modelled on a transputer network, and implementation issues are discussed
- Full Text:
- Date Issued: 1988
- Authors: Hill, David Timothy
- Date: 1988 , 2013-03-07
- Subjects: occam (Computer program language) , Transputers , Parallel programming (Computer science)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4587 , http://hdl.handle.net/10962/d1004749 , occam (Computer program language) , Transputers , Parallel programming (Computer science)
- Description: Occam is designed for concurrent programming on a network of transputers. AIlocation and partitioning of the program is specified within the source code, binding the program to a specific network. An altemative approach is proposed which completely separates the source code from hardware considerations. Static allocation is performed as a separate phase and should, ideally, be automatic but at present is manual. Complete hardware abstraction requires that non-local, shared communication be provided for, introducing an efficiency overhead which can be minimised by the allocation. The proposal was implemented on a network of IBM PCs, modelled on a transputer network, and implementation issues are discussed
- Full Text:
- Date Issued: 1988
What makes a painting good?: an enquiry into the criteria used in evaluation
- Authors: Frost, Lola
- Date: 1988
- Subjects: Painting -- Appreciation
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2461 , http://hdl.handle.net/10962/d1008542
- Description: From introduction: "To affirm that a work of art is good or bad is to commend or condemn, but not describe . Thus criticism does not, and cannot, have the impersonal character and strict rules applicable independently of time and place," .. . (Macdonald 1966: 111) "Criticism and appraisal, too, are more like creation than like demonstration and proof." (Macdonald 1966: 112) This essay articulates evaluatory criteria that are used by both critics and laymen and which are cross -culturally applicable. Thus it seeks to articulate relatively objective types of criteria which we all use when evaluating paintings. This essay articulates fixed and objective criteria, but within these categories recognizes that there is much room for skillful, sympathetic and knowledgeable criticism. Thus criticism is a creative act. These objectively- articulated criteria are best seen as aids to, rather than carbon copies, for evaluation.
- Full Text:
- Date Issued: 1988
- Authors: Frost, Lola
- Date: 1988
- Subjects: Painting -- Appreciation
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2461 , http://hdl.handle.net/10962/d1008542
- Description: From introduction: "To affirm that a work of art is good or bad is to commend or condemn, but not describe . Thus criticism does not, and cannot, have the impersonal character and strict rules applicable independently of time and place," .. . (Macdonald 1966: 111) "Criticism and appraisal, too, are more like creation than like demonstration and proof." (Macdonald 1966: 112) This essay articulates evaluatory criteria that are used by both critics and laymen and which are cross -culturally applicable. Thus it seeks to articulate relatively objective types of criteria which we all use when evaluating paintings. This essay articulates fixed and objective criteria, but within these categories recognizes that there is much room for skillful, sympathetic and knowledgeable criticism. Thus criticism is a creative act. These objectively- articulated criteria are best seen as aids to, rather than carbon copies, for evaluation.
- Full Text:
- Date Issued: 1988