A study of the population dynamics, production and potential yield of the sardine Limnothrissa Miodon (Boulenger) in Lake Kariba
- Authors: Marshall, Brian Eric
- Date: 1987
- Subjects: Fishes Lake Tanganyika sardine
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5191 , http://hdl.handle.net/10962/d1001967
- Description: The limnology of Lake Kariba, especially those aspects that affect sardine biology, are described. The hydrological regime of the lake is seen as a major influence and may be one of the reasons why the fish are very much smaller in Kariba than they are in Lakes Tanganyika or Kivu. Growth was reassessed and there appeared to be a correlation between rates of growth and limnological parameters. In particular, the fish appeared to grow faster, but smaller, in the man-made lakes and this may be a consequence of food shortages brought about by their hydrological characteristics. Mortality rates were also much higher in Kariba and this tended to support the view that the lake is a relatively unsuitable habitat for the sardines. However, estimates of biomass, expressed in terms of lake volume, contradicted this as they were very similar in both Kariba and Tanganyika. The life history strategy of Limnothrissa in Kariba was therefore to reduce its size and increase its productivity in order to maintain the maximum possible biomass and its very high P/B̄ ratio was probably the means by which this was achieved. In terms of lake volume the predicted yields from the pelagic communities of Kariba and Tanganyika were very similar, equivalent to about 20 000 t annually for Kariba. This is close to the yield predicted by several empirical models and the fishery now appears to be entering a phase where increases in effort will not be matched by increased yields. The mechanisms for controlling effort in the fishery appear to be inadequate and particular concern was expressed about the lack of co-ordination between the Zimbabwean and Zambian fishery authorities in planning the development of this shared resource.
- Full Text:
- Date Issued: 1987
- Authors: Marshall, Brian Eric
- Date: 1987
- Subjects: Fishes Lake Tanganyika sardine
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5191 , http://hdl.handle.net/10962/d1001967
- Description: The limnology of Lake Kariba, especially those aspects that affect sardine biology, are described. The hydrological regime of the lake is seen as a major influence and may be one of the reasons why the fish are very much smaller in Kariba than they are in Lakes Tanganyika or Kivu. Growth was reassessed and there appeared to be a correlation between rates of growth and limnological parameters. In particular, the fish appeared to grow faster, but smaller, in the man-made lakes and this may be a consequence of food shortages brought about by their hydrological characteristics. Mortality rates were also much higher in Kariba and this tended to support the view that the lake is a relatively unsuitable habitat for the sardines. However, estimates of biomass, expressed in terms of lake volume, contradicted this as they were very similar in both Kariba and Tanganyika. The life history strategy of Limnothrissa in Kariba was therefore to reduce its size and increase its productivity in order to maintain the maximum possible biomass and its very high P/B̄ ratio was probably the means by which this was achieved. In terms of lake volume the predicted yields from the pelagic communities of Kariba and Tanganyika were very similar, equivalent to about 20 000 t annually for Kariba. This is close to the yield predicted by several empirical models and the fishery now appears to be entering a phase where increases in effort will not be matched by increased yields. The mechanisms for controlling effort in the fishery appear to be inadequate and particular concern was expressed about the lack of co-ordination between the Zimbabwean and Zambian fishery authorities in planning the development of this shared resource.
- Full Text:
- Date Issued: 1987
A study of the nature, function and availability of orders of restitutio in integrum and specific performance as remedies in South African law
- Authors: Lambiris, Michael A
- Date: 1987
- Subjects: Restitutio in integrum (Roman law) Restitutio in integrum -- South Africa Remedies (Law) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3703 , http://hdl.handle.net/10962/d1004752
- Description: This study is of two remedies that are available in South African law: orders of restitutio in integrum, and specific performance. The study demonstrates that, by treating these remedies as legal topics in their own right, a greater understanding emerges of their inherent characteristics, the role that they play in the law, and of the particular circumstances in which these remedies are available. An order of restitutio in integrum performs an important and unique function in South African law. The fundamental realisation is that it is a remedy in terms of which the courts exercise an extraordinary and discretionary power, and nullify ab initio legal transactions, or the legal consequences of events, which were previously perfectly valid and enforceable at law. Because of the extraordinary nature of this remedy, the circumstances in which it is available are limited by the requirement that iusta causa must exist to justify nullification. Further, before the remedy is available, the person seeking relief must have suffered loss or prejudice as a result of the event complained of. Finally, a mutual restoration of benefits received by the persons involved is required. The nature and effect of orders of restitutio in integrum, and the essential elements which determine the availability of the remedy, enable it to be distinguished from, and contrasted with, other remedies in South African law. An order of specific performance is available in South African law, at the option of a plaintiff, to enforce the actual performance of contractual undertakings. The remedy is appropriate to enforce positive undertakings, as well as acts of restraint. For the remedy to be available, it is firstly necessary that a contractual obligation be proved to exist. Secondly, performance of that obligation must be due. Thirdly, the performance sought must not in fact have already been rendered. These elements determine the availability of the remedy in particular factual circumstances, such as in cases involving pre-emptive rights. The nature and characteristics of the remedy are determined by principles of South African, and not English law. The remedy is available as of right in South African law, but subject to a discretionary power of a court to refuse to order specific performance. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
- Authors: Lambiris, Michael A
- Date: 1987
- Subjects: Restitutio in integrum (Roman law) Restitutio in integrum -- South Africa Remedies (Law) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3703 , http://hdl.handle.net/10962/d1004752
- Description: This study is of two remedies that are available in South African law: orders of restitutio in integrum, and specific performance. The study demonstrates that, by treating these remedies as legal topics in their own right, a greater understanding emerges of their inherent characteristics, the role that they play in the law, and of the particular circumstances in which these remedies are available. An order of restitutio in integrum performs an important and unique function in South African law. The fundamental realisation is that it is a remedy in terms of which the courts exercise an extraordinary and discretionary power, and nullify ab initio legal transactions, or the legal consequences of events, which were previously perfectly valid and enforceable at law. Because of the extraordinary nature of this remedy, the circumstances in which it is available are limited by the requirement that iusta causa must exist to justify nullification. Further, before the remedy is available, the person seeking relief must have suffered loss or prejudice as a result of the event complained of. Finally, a mutual restoration of benefits received by the persons involved is required. The nature and effect of orders of restitutio in integrum, and the essential elements which determine the availability of the remedy, enable it to be distinguished from, and contrasted with, other remedies in South African law. An order of specific performance is available in South African law, at the option of a plaintiff, to enforce the actual performance of contractual undertakings. The remedy is appropriate to enforce positive undertakings, as well as acts of restraint. For the remedy to be available, it is firstly necessary that a contractual obligation be proved to exist. Secondly, performance of that obligation must be due. Thirdly, the performance sought must not in fact have already been rendered. These elements determine the availability of the remedy in particular factual circumstances, such as in cases involving pre-emptive rights. The nature and characteristics of the remedy are determined by principles of South African, and not English law. The remedy is available as of right in South African law, but subject to a discretionary power of a court to refuse to order specific performance. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
Pauline Smith : between worlds
- Authors: Driver, Dorothy
- Date: 1987
- Subjects: Smith, Pauline, 1883-1959
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2266 , http://hdl.handle.net/10962/d1004792
- Full Text:
- Date Issued: 1987
- Authors: Driver, Dorothy
- Date: 1987
- Subjects: Smith, Pauline, 1883-1959
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2266 , http://hdl.handle.net/10962/d1004792
- Full Text:
- 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.
- Full Text:
- Date Issued: 1987
- 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.
- Full Text:
- Date Issued: 1987
Techniques of Xhosa music: a study based on the music of the Lumko district
- Authors: Dargie, David John
- Date: 1987
- Subjects: Xhosa (African people) -- Music , Lumko district , Eastern Cape (South Africa) , Xhosa music , Musicology , AbaThembu , Ntsikana , Songs , Musical bows , Overtone singing
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2630 , http://hdl.handle.net/10962/d1001975
- Description: Part 1.Thesis: Chapter 1: The people of the Lumko district (the villages of Ngqoko and Sikhwankqeni) are AbaThembu, mostly of the Gcina clan cluster. Their history has caused them to be linked with (now vanished) San peoples in special ways, which have undoubtedly influenced their music. Chapter 2: The music of these people is centred around their religious and social life. This affects the way they classify their songs; and song classifications (and the way songs are used) affect their performance, in particular, the dance styles associated with the song classes. Chapter 3: A variety of musical instruments is used in the Lumko district, the most important being the musical bows. Once again, the use of these bows gives an insight into the musical influences that have affected the people historically. The ways the bows work are described, as well as ways to play them. Chapter 4: Overtone singing, not previously documented anywhere in traditional African music, is practised in certain ways by these AmaGcina. These, and other vocal techniques, are described. Chapter 5: From the terminology and the methods of conceptualisation about music in the Lumko district, it is possible to gain an insight into a truly Xhosa technical understanding of Xhosa music. Once again a historical insight is gained, because so many of the important terms are KhoiSan words. Chapter 6: A Western technological (i. e. musicological) understanding of the music is also necessary in a study of this nature. This chapter applies musicological concepts to an examination of the relationship between speech and song, of the usages in melody and scale, harmony theory, rhythm, polyphony, song form, instrumental roles and methods of performance. Chapter 7: This is the conclusion of the thesis. It sums up what has been studied: musical techniques, principles, the importance of Ntsikana 's song as a basis for musical comparisons, and the import of the historical aspects of the study - a possible glimpse of the music of the San. PART 2. MUSIC TRANSCRIPTIONS AND DESCRIPTIONS. The transcriptions of 62 songs provide the material for this study. The songs were chosen to represent all the major song classes used in the Lumko district, and to represent all the important music techniques as well. The songs are in fifteen categories. Each song is accompanied by its technical details, and sufficient commentary to make the song transcription intelligible and meaningful. Certain key songs are chosen as type-songs or other special examples, and are used as the bases for discussion on song style characteristics, principles of performance, bow adaptation, and so on. A general Introduction to Part 2 describes and accounts for the method of transcription, and also attempts to make it possible for the score reader not only to analyse, but also to perform the songs. In a further attempt to bring the transcriptions to life, a video recording of certain key songs and techniques, and audio tapes with examples taken from all the songs, accompany this study
- Full Text:
- Date Issued: 1987
- Authors: Dargie, David John
- Date: 1987
- Subjects: Xhosa (African people) -- Music , Lumko district , Eastern Cape (South Africa) , Xhosa music , Musicology , AbaThembu , Ntsikana , Songs , Musical bows , Overtone singing
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2630 , http://hdl.handle.net/10962/d1001975
- Description: Part 1.Thesis: Chapter 1: The people of the Lumko district (the villages of Ngqoko and Sikhwankqeni) are AbaThembu, mostly of the Gcina clan cluster. Their history has caused them to be linked with (now vanished) San peoples in special ways, which have undoubtedly influenced their music. Chapter 2: The music of these people is centred around their religious and social life. This affects the way they classify their songs; and song classifications (and the way songs are used) affect their performance, in particular, the dance styles associated with the song classes. Chapter 3: A variety of musical instruments is used in the Lumko district, the most important being the musical bows. Once again, the use of these bows gives an insight into the musical influences that have affected the people historically. The ways the bows work are described, as well as ways to play them. Chapter 4: Overtone singing, not previously documented anywhere in traditional African music, is practised in certain ways by these AmaGcina. These, and other vocal techniques, are described. Chapter 5: From the terminology and the methods of conceptualisation about music in the Lumko district, it is possible to gain an insight into a truly Xhosa technical understanding of Xhosa music. Once again a historical insight is gained, because so many of the important terms are KhoiSan words. Chapter 6: A Western technological (i. e. musicological) understanding of the music is also necessary in a study of this nature. This chapter applies musicological concepts to an examination of the relationship between speech and song, of the usages in melody and scale, harmony theory, rhythm, polyphony, song form, instrumental roles and methods of performance. Chapter 7: This is the conclusion of the thesis. It sums up what has been studied: musical techniques, principles, the importance of Ntsikana 's song as a basis for musical comparisons, and the import of the historical aspects of the study - a possible glimpse of the music of the San. PART 2. MUSIC TRANSCRIPTIONS AND DESCRIPTIONS. The transcriptions of 62 songs provide the material for this study. The songs were chosen to represent all the major song classes used in the Lumko district, and to represent all the important music techniques as well. The songs are in fifteen categories. Each song is accompanied by its technical details, and sufficient commentary to make the song transcription intelligible and meaningful. Certain key songs are chosen as type-songs or other special examples, and are used as the bases for discussion on song style characteristics, principles of performance, bow adaptation, and so on. A general Introduction to Part 2 describes and accounts for the method of transcription, and also attempts to make it possible for the score reader not only to analyse, but also to perform the songs. In a further attempt to bring the transcriptions to life, a video recording of certain key songs and techniques, and audio tapes with examples taken from all the songs, accompany this study
- Full Text:
- 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.
- Full Text:
- Date Issued: 1987
- 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.
- Full Text:
- Date Issued: 1987
Studies on the biology of the economic marine red alga Gelidium pristoides (Turner) Kuetzing (Gelidiales : Rhodophyta)
- Authors: Carter, Alan Robert
- Date: 1987
- Subjects: Red algae Marine algae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4240 , http://hdl.handle.net/10962/d1004774
- Description: Various aspects of the biology of the intertidal agarophyte, Gelidium pristoides, were investigated, with the aim of providing information that would assist in formulating a management policy for this economic seaweed resource. G.pristoides occurs as tufts comprising as many as 40 individual plants, representing all three conspicuous life history stages, that are linked by the intertwining of their basal creeping axes. Individual plants consist of a system of branched creeping axes, which is largely responsible for colonizing surrounding substrata, from which one or more erect flattened fronds arise. These erect fronds may reach a height of 15 cm, and are irregularly bipinnately branched. Internal vegetative anatomy is generally typical of the genus. Morphological variation in mature plants is limited to increased plant height and branch density during the summer season. A dorso-ventrally flattened creeping habit was seen during early recruitment on flat rock surfaces and limpet shells within grazer exclusion plots, which developed into typical erect plants. Although there is a close taxonomic affinity between G.pristoides and the low-growing Gelidium turf, which occurs on wave-cut platforms in the eastern Cape (both produce bispores), the turf appears to represent a genetically divergent ecotype of the typical G.pristoides habit. In the light of present observations, it is suggested that the recent inclusion of G.pristoides in the new Onikusa genus should be questioned. Reproduction in G.pristoides is typical of the genus, except for the production of bispores, instead of tetraspores, in the sporophyte generation. The smaller nuclei in the binucleate bispores, in comparison to carpospores, suggested they are the product of normal meiosis (meiospores). This was confi rmed by chromosome counts of germl i ngs deri ved from bispores (n = 13-17) and carpospores (2n = 28-33). Throughout the geographical range of the seaweed, the bisporophyte generation is dominant over the combined male and female gametophyte generati on by a ratio of about 3 : 1. This imbalance may be due to bispores. G.pristoides a greater germination success of carpospores over plants are fertile throughout the year, while at Port Alfred there is no apparent seasonality in spore release. Growth of carpospore and bispore germlings is similar under various temperature treatments in culture. Optimum temperatures for growth were from 15-23°C, which corresponds with the sea temperatures experienced within the geographical range of the species . At Port Alfred, growth (linear frond elongation) and standing crop levels were maximal during summer . Ory weight levels were significantly inversely related to both growth and ash levels. Agar contents (% of dry weight) were generally greater in summer (48% ) than in winter (30%), and were inversely correlated with thallus nitrogen levels. Agar contents of distal plant halves were higher (8-15%) than in proximal halves. Regrowth of G.pristoides to original biomass or standing crop levels after harvesting, is similar for plucking and shearing at different times of the year. Regrowth is more rapid after spring and summer harvests (2-3 months) than after winter harvests (4-5 months). During the summer season, harvesting at monthly intervals showed significantly greater total yields, and production rates (e.g . 3.13 g. dry wt. / m2 / day for plucking) than under 3-monthly intervals (1.42 g. dry wt. / m2 / day for plucking). In contrast, average yields per harvest were Significantly greater when recovery period was longer (e.g. 3 months). Quadrats that were completely denuded failed to recover after a year, while regrowth was also retarded with increased elevation on the shore. Agar contents did not differ Significantly between plucked (38%) and sheared (42%) plant material. G.pristoides is distributed from about 0 . 2-0.75 m above MLWS, with a reduction in stature and frequency corresponding to increased elevation on the shore. Frond elongation rates, germling survival and recruitment within grazer-exclusion plots, is retarded with increased elevation level. Plants transplanted above the normal vertical range of the seaweed became severely bleached and died, while plants transplanted below the normal range of the seaweed (sub littoral fringe) senesced due to overgrowth by the epiphytic encrusting coralline, Polyporolithon patena (Hook . et Harv . ) Mason . G.pristoides recrui t ment in the sublittoral fri nge was enhanced with the exclusion of grazers . However, successful recruits were displaced due to smothering by articulated corallines (e.g. Corallina sp. and Jania sp. ) . G.pristoides is largely restricted to cracks and crevices in the rock, and also occurs on a large proportion of the available shells of the limpet Patella oculus Born., and to a lesser extent, shells of the barnacle Tetraclita serrata. G.pristoides recruitment was significantly enhanced by the exclusion of grazers (using toxic antifouling paint barriers). G.pristoides recruitment within the exclusion plots was significantly greater on artificially attached limpet shells (almost 100% cover) than on rock surfaces (20-30% cover), which occurred largely within cracks and crevies in the rocky substratum. ly attached to limpet G.pristoides plants are significantly more strongand barnacle shells than to rock and epilithic encrusting corallines (Lithothamnion sp.). Removal of G.pristoides from limpet shells revealed pits of a uniform size in the surface of the shells, into which the rhizoidal attachment organs of the seaweed penetrate. It is concluded that the horizontal distribution of G.pristoides is largely controlled by grazers (and "escapes" from grazing) and resistance to dislodgement by wave action. Based on present results, and considering some of the socio-economic factors associated with the Gelidium industry in South Africa, suggestions are made concerning the management and long-term maintenance of G.pristoides resources in the eastern Cape.
- Full Text:
- Date Issued: 1987
- Authors: Carter, Alan Robert
- Date: 1987
- Subjects: Red algae Marine algae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4240 , http://hdl.handle.net/10962/d1004774
- Description: Various aspects of the biology of the intertidal agarophyte, Gelidium pristoides, were investigated, with the aim of providing information that would assist in formulating a management policy for this economic seaweed resource. G.pristoides occurs as tufts comprising as many as 40 individual plants, representing all three conspicuous life history stages, that are linked by the intertwining of their basal creeping axes. Individual plants consist of a system of branched creeping axes, which is largely responsible for colonizing surrounding substrata, from which one or more erect flattened fronds arise. These erect fronds may reach a height of 15 cm, and are irregularly bipinnately branched. Internal vegetative anatomy is generally typical of the genus. Morphological variation in mature plants is limited to increased plant height and branch density during the summer season. A dorso-ventrally flattened creeping habit was seen during early recruitment on flat rock surfaces and limpet shells within grazer exclusion plots, which developed into typical erect plants. Although there is a close taxonomic affinity between G.pristoides and the low-growing Gelidium turf, which occurs on wave-cut platforms in the eastern Cape (both produce bispores), the turf appears to represent a genetically divergent ecotype of the typical G.pristoides habit. In the light of present observations, it is suggested that the recent inclusion of G.pristoides in the new Onikusa genus should be questioned. Reproduction in G.pristoides is typical of the genus, except for the production of bispores, instead of tetraspores, in the sporophyte generation. The smaller nuclei in the binucleate bispores, in comparison to carpospores, suggested they are the product of normal meiosis (meiospores). This was confi rmed by chromosome counts of germl i ngs deri ved from bispores (n = 13-17) and carpospores (2n = 28-33). Throughout the geographical range of the seaweed, the bisporophyte generation is dominant over the combined male and female gametophyte generati on by a ratio of about 3 : 1. This imbalance may be due to bispores. G.pristoides a greater germination success of carpospores over plants are fertile throughout the year, while at Port Alfred there is no apparent seasonality in spore release. Growth of carpospore and bispore germlings is similar under various temperature treatments in culture. Optimum temperatures for growth were from 15-23°C, which corresponds with the sea temperatures experienced within the geographical range of the species . At Port Alfred, growth (linear frond elongation) and standing crop levels were maximal during summer . Ory weight levels were significantly inversely related to both growth and ash levels. Agar contents (% of dry weight) were generally greater in summer (48% ) than in winter (30%), and were inversely correlated with thallus nitrogen levels. Agar contents of distal plant halves were higher (8-15%) than in proximal halves. Regrowth of G.pristoides to original biomass or standing crop levels after harvesting, is similar for plucking and shearing at different times of the year. Regrowth is more rapid after spring and summer harvests (2-3 months) than after winter harvests (4-5 months). During the summer season, harvesting at monthly intervals showed significantly greater total yields, and production rates (e.g . 3.13 g. dry wt. / m2 / day for plucking) than under 3-monthly intervals (1.42 g. dry wt. / m2 / day for plucking). In contrast, average yields per harvest were Significantly greater when recovery period was longer (e.g. 3 months). Quadrats that were completely denuded failed to recover after a year, while regrowth was also retarded with increased elevation on the shore. Agar contents did not differ Significantly between plucked (38%) and sheared (42%) plant material. G.pristoides is distributed from about 0 . 2-0.75 m above MLWS, with a reduction in stature and frequency corresponding to increased elevation on the shore. Frond elongation rates, germling survival and recruitment within grazer-exclusion plots, is retarded with increased elevation level. Plants transplanted above the normal vertical range of the seaweed became severely bleached and died, while plants transplanted below the normal range of the seaweed (sub littoral fringe) senesced due to overgrowth by the epiphytic encrusting coralline, Polyporolithon patena (Hook . et Harv . ) Mason . G.pristoides recrui t ment in the sublittoral fri nge was enhanced with the exclusion of grazers . However, successful recruits were displaced due to smothering by articulated corallines (e.g. Corallina sp. and Jania sp. ) . G.pristoides is largely restricted to cracks and crevices in the rock, and also occurs on a large proportion of the available shells of the limpet Patella oculus Born., and to a lesser extent, shells of the barnacle Tetraclita serrata. G.pristoides recruitment was significantly enhanced by the exclusion of grazers (using toxic antifouling paint barriers). G.pristoides recruitment within the exclusion plots was significantly greater on artificially attached limpet shells (almost 100% cover) than on rock surfaces (20-30% cover), which occurred largely within cracks and crevies in the rocky substratum. ly attached to limpet G.pristoides plants are significantly more strongand barnacle shells than to rock and epilithic encrusting corallines (Lithothamnion sp.). Removal of G.pristoides from limpet shells revealed pits of a uniform size in the surface of the shells, into which the rhizoidal attachment organs of the seaweed penetrate. It is concluded that the horizontal distribution of G.pristoides is largely controlled by grazers (and "escapes" from grazing) and resistance to dislodgement by wave action. Based on present results, and considering some of the socio-economic factors associated with the Gelidium industry in South Africa, suggestions are made concerning the management and long-term maintenance of G.pristoides resources in the eastern Cape.
- Full Text:
- 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
- Full Text:
- Date Issued: 1987
- 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
- Full Text:
- Date Issued: 1987
The role of the self-concept in a system of guidance at the level of initial adolescence
- Authors: Hall, Deryck John
- Date: 1987
- Subjects: Self-perception in adolescence , Educational counseling
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1382 , http://hdl.handle.net/10962/d1001448
- Description: Part One I A Perspective on Guidance II Concepts of Self This section is a review and discussion of the two conceptualizations which are fundamental to the research structure: guidance as an overall framework within which procedures are devised for the development of this understanding of the "self" . Part Two • III Didactic Discovery IV The Class Citation Award A way of thinking about an ~ducational approach which could generate a classroom mileu, where the in a practical ongoing process to encourage participation and CCA is the key~ote strategy involve the group in "self" and "other" awareness. Part Three V VI Experiment, Survey, Action Research Results, Reflections and Recommendations The three research methods employed to gather evidence of pupil awareness and its implications, with a discussion patterns of self~knowledge, and its effect on the NOTE: Constant reference to thi s page, and to page xxxii will enable the reader to view the thesis as a whole
- Full Text:
- Date Issued: 1987
- Authors: Hall, Deryck John
- Date: 1987
- Subjects: Self-perception in adolescence , Educational counseling
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1382 , http://hdl.handle.net/10962/d1001448
- Description: Part One I A Perspective on Guidance II Concepts of Self This section is a review and discussion of the two conceptualizations which are fundamental to the research structure: guidance as an overall framework within which procedures are devised for the development of this understanding of the "self" . Part Two • III Didactic Discovery IV The Class Citation Award A way of thinking about an ~ducational approach which could generate a classroom mileu, where the in a practical ongoing process to encourage participation and CCA is the key~ote strategy involve the group in "self" and "other" awareness. Part Three V VI Experiment, Survey, Action Research Results, Reflections and Recommendations The three research methods employed to gather evidence of pupil awareness and its implications, with a discussion patterns of self~knowledge, and its effect on the NOTE: Constant reference to thi s page, and to page xxxii will enable the reader to view the thesis as a whole
- Full Text:
- Date Issued: 1987
Studies on the biology of the economic marine red alga Gelidium pristoides (Turner) Kuetzing (Gelidiales : Rhodophyta)
- Authors: Carter, Alan Robert
- Date: 1987
- Subjects: Red algae Marine algae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4239 , http://hdl.handle.net/10962/d1004774
- Description: Various aspects of the biology of the intertidal agarophyte, Gelidium pristoides, were investigated, with the aim of providing information that would assist in formulating a management policy for this economic seaweed resource. G.pristoides occurs as tufts comprising as many as 40 individual plants, representing all three conspicuous life history stages, that are linked by the intertwining of their basal creeping axes. Individual plants consist of a system of branched creeping axes, which is largely responsible for colonizing surrounding substrata, from which one or more erect flattened fronds arise. These erect fronds may reach a height of 15 cm, and are irregularly bipinnately branched. Internal vegetative anatomy is generally typical of the genus. Morphological variation in mature plants is limited to increased plant height and branch density during the summer season. A dorso-ventrally flattened creeping habit was seen during early recruitment on flat rock surfaces and limpet shells within grazer exclusion plots, which developed into typical erect plants. Although there is a close taxonomic affinity between G.pristoides and the low-growing Gelidium turf, which occurs on wave-cut platforms in the eastern Cape (both produce bispores), the turf appears to represent a genetically divergent ecotype of the typical G.pristoides habit. In the light of present observations, it is suggested that the recent inclusion of G.pristoides in the new Onikusa genus should be questioned. Reproduction in G.pristoides is typical of the genus, except for the production of bispores, instead of tetraspores, in the sporophyte generation. The smaller nuclei in the binucleate bispores, in comparison to carpospores, suggested they are the product of normal meiosis (meiospores). This was confi rmed by chromosome counts of germl i ngs deri ved from bispores (n = 13-17) and carpospores (2n = 28-33). Throughout the geographical range of the seaweed, the bisporophyte generation is dominant over the combined male and female gametophyte generati on by a ratio of about 3 : 1. This imbalance may be due to bispores. G.pristoides a greater germination success of carpospores over plants are fertile throughout the year, while at Port Alfred there is no apparent seasonality in spore release. Growth of carpospore and bispore germlings is similar under various temperature treatments in culture. Optimum temperatures for growth were from 15-23°C, which corresponds with the sea temperatures experienced within the geographical range of the species . At Port Alfred, growth (linear frond elongation) and standing crop levels were maximal during summer . Ory weight levels were significantly inversely related to both growth and ash levels. Agar contents (% of dry weight) were generally greater in summer (48% ) than in winter (30%), and were inversely correlated with thallus nitrogen levels. Agar contents of distal plant halves were higher (8-15%) than in proximal halves. Regrowth of G.pristoides to original biomass or standing crop levels after harvesting, is similar for plucking and shearing at different times of the year. Regrowth is more rapid after spring and summer harvests (2-3 months) than after winter harvests (4-5 months). During the summer season, harvesting at monthly intervals showed significantly greater total yields, and production rates (e.g . 3.13 g. dry wt. / m2 / day for plucking) than under 3-monthly intervals (1.42 g. dry wt. / m2 / day for plucking). In contrast, average yields per harvest were Significantly greater when recovery period was longer (e.g. 3 months). Quadrats that were completely denuded failed to recover after a year, while regrowth was also retarded with increased elevation on the shore. Agar contents did not differ Significantly between plucked (38%) and sheared (42%) plant material. G.pristoides is distributed from about 0 . 2-0.75 m above MLWS, with a reduction in stature and frequency corresponding to increased elevation on the shore. Frond elongation rates, germling survival and recruitment within grazer-exclusion plots, is retarded with increased elevation level. Plants transplanted above the normal vertical range of the seaweed became severely bleached and died, while plants transplanted below the normal range of the seaweed (sub littoral fringe) senesced due to overgrowth by the epiphytic encrusting coralline, Polyporolithon patena (Hook . et Harv . ) Mason . G.pristoides recrui t ment in the sublittoral fri nge was enhanced with the exclusion of grazers . However, successful recruits were displaced due to smothering by articulated corallines (e.g. Corallina sp. and Jania sp. ) . G.pristoides is largely restricted to cracks and crevices in the rock, and also occurs on a large proportion of the available shells of the limpet Patella oculus Born., and to a lesser extent, shells of the barnacle Tetraclita serrata. G.pristoides recruitment was significantly enhanced by the exclusion of grazers (using toxic antifouling paint barriers). G.pristoides recruitment within the exclusion plots was significantly greater on artificially attached limpet shells (almost 100% cover) than on rock surfaces (20-30% cover), which occurred largely within cracks and crevies in the rocky substratum. ly attached to limpet G.pristoides plants are significantly more strongand barnacle shells than to rock and epilithic encrusting corallines (Lithothamnion sp.). Removal of G.pristoides from limpet shells revealed pits of a uniform size in the surface of the shells, into which the rhizoidal attachment organs of the seaweed penetrate. It is concluded that the horizontal distribution of G.pristoides is largely controlled by grazers (and "escapes" from grazing) and resistance to dislodgement by wave action. Based on present results, and considering some of the socio-economic factors associated with the Gelidium industry in South Africa, suggestions are made concerning the management and long-term maintenance of G.pristoides resources in the eastern Cape.
- Full Text:
- Date Issued: 1987
- Authors: Carter, Alan Robert
- Date: 1987
- Subjects: Red algae Marine algae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4239 , http://hdl.handle.net/10962/d1004774
- Description: Various aspects of the biology of the intertidal agarophyte, Gelidium pristoides, were investigated, with the aim of providing information that would assist in formulating a management policy for this economic seaweed resource. G.pristoides occurs as tufts comprising as many as 40 individual plants, representing all three conspicuous life history stages, that are linked by the intertwining of their basal creeping axes. Individual plants consist of a system of branched creeping axes, which is largely responsible for colonizing surrounding substrata, from which one or more erect flattened fronds arise. These erect fronds may reach a height of 15 cm, and are irregularly bipinnately branched. Internal vegetative anatomy is generally typical of the genus. Morphological variation in mature plants is limited to increased plant height and branch density during the summer season. A dorso-ventrally flattened creeping habit was seen during early recruitment on flat rock surfaces and limpet shells within grazer exclusion plots, which developed into typical erect plants. Although there is a close taxonomic affinity between G.pristoides and the low-growing Gelidium turf, which occurs on wave-cut platforms in the eastern Cape (both produce bispores), the turf appears to represent a genetically divergent ecotype of the typical G.pristoides habit. In the light of present observations, it is suggested that the recent inclusion of G.pristoides in the new Onikusa genus should be questioned. Reproduction in G.pristoides is typical of the genus, except for the production of bispores, instead of tetraspores, in the sporophyte generation. The smaller nuclei in the binucleate bispores, in comparison to carpospores, suggested they are the product of normal meiosis (meiospores). This was confi rmed by chromosome counts of germl i ngs deri ved from bispores (n = 13-17) and carpospores (2n = 28-33). Throughout the geographical range of the seaweed, the bisporophyte generation is dominant over the combined male and female gametophyte generati on by a ratio of about 3 : 1. This imbalance may be due to bispores. G.pristoides a greater germination success of carpospores over plants are fertile throughout the year, while at Port Alfred there is no apparent seasonality in spore release. Growth of carpospore and bispore germlings is similar under various temperature treatments in culture. Optimum temperatures for growth were from 15-23°C, which corresponds with the sea temperatures experienced within the geographical range of the species . At Port Alfred, growth (linear frond elongation) and standing crop levels were maximal during summer . Ory weight levels were significantly inversely related to both growth and ash levels. Agar contents (% of dry weight) were generally greater in summer (48% ) than in winter (30%), and were inversely correlated with thallus nitrogen levels. Agar contents of distal plant halves were higher (8-15%) than in proximal halves. Regrowth of G.pristoides to original biomass or standing crop levels after harvesting, is similar for plucking and shearing at different times of the year. Regrowth is more rapid after spring and summer harvests (2-3 months) than after winter harvests (4-5 months). During the summer season, harvesting at monthly intervals showed significantly greater total yields, and production rates (e.g . 3.13 g. dry wt. / m2 / day for plucking) than under 3-monthly intervals (1.42 g. dry wt. / m2 / day for plucking). In contrast, average yields per harvest were Significantly greater when recovery period was longer (e.g. 3 months). Quadrats that were completely denuded failed to recover after a year, while regrowth was also retarded with increased elevation on the shore. Agar contents did not differ Significantly between plucked (38%) and sheared (42%) plant material. G.pristoides is distributed from about 0 . 2-0.75 m above MLWS, with a reduction in stature and frequency corresponding to increased elevation on the shore. Frond elongation rates, germling survival and recruitment within grazer-exclusion plots, is retarded with increased elevation level. Plants transplanted above the normal vertical range of the seaweed became severely bleached and died, while plants transplanted below the normal range of the seaweed (sub littoral fringe) senesced due to overgrowth by the epiphytic encrusting coralline, Polyporolithon patena (Hook . et Harv . ) Mason . G.pristoides recrui t ment in the sublittoral fri nge was enhanced with the exclusion of grazers . However, successful recruits were displaced due to smothering by articulated corallines (e.g. Corallina sp. and Jania sp. ) . G.pristoides is largely restricted to cracks and crevices in the rock, and also occurs on a large proportion of the available shells of the limpet Patella oculus Born., and to a lesser extent, shells of the barnacle Tetraclita serrata. G.pristoides recruitment was significantly enhanced by the exclusion of grazers (using toxic antifouling paint barriers). G.pristoides recruitment within the exclusion plots was significantly greater on artificially attached limpet shells (almost 100% cover) than on rock surfaces (20-30% cover), which occurred largely within cracks and crevies in the rocky substratum. ly attached to limpet G.pristoides plants are significantly more strongand barnacle shells than to rock and epilithic encrusting corallines (Lithothamnion sp.). Removal of G.pristoides from limpet shells revealed pits of a uniform size in the surface of the shells, into which the rhizoidal attachment organs of the seaweed penetrate. It is concluded that the horizontal distribution of G.pristoides is largely controlled by grazers (and "escapes" from grazing) and resistance to dislodgement by wave action. Based on present results, and considering some of the socio-economic factors associated with the Gelidium industry in South Africa, suggestions are made concerning the management and long-term maintenance of G.pristoides resources in the eastern Cape.
- Full Text:
- Date Issued: 1987
Investering : die problematiek van investering-besluitneming vir die privaatsektor in die vervaardigingsbedryf in die Grens, Ciskei en Transkei
- Authors: O'Neill, Richard Charles
- Date: 1987
- Subjects: Investments -- South Africa -- Ciskei , Investments -- South Africa -- Transkei
- Language: Afrikaans
- Type: Thesis , Doctoral , PhD
- Identifier: vital:924 , http://hdl.handle.net/10962/d1001450
- Description: Die langtermynaard van 'n investering noop die voornemende investeerder om meer omsigtig te beplan as in die geval van 'n belegging wat gewoonlik oor 'n korter termyn strek. Die voornemende investeerder moet besef dat 'n investeringsbesluit nie in isolasie van eksterne faktore geneem kan word nie. Dit is daarom raadsaam dat die voornemende investeerder hom deeglik van die makro- en mikro ekonomiese milieu waarbinne die investering beoog word, sal vergewis. Ten einde die kompleksiteit van investeringsbesluitneming op te helder, word daareerstens in hoofstuk 1 op die begrip van investering gekonsentreer. Voorts word die beginsel dat die investeringsbesluit nie in isolasie geneem kan word nie, beklemtoon. In hierdie opsig word daar veral na die determinante van investering gekyk. In makro-ekonomiese verband word die gedagte sterk beklemtoon dat investering nodig is om kapitaalvorming te laat plaasvind wat op sy beurt een van die vereistes is om ontwikkeling te bevorder. As gevolg van meningsverskille ten opsigte van die invloed van investering in ontwikkelde teenoor ontwikkelende lande is daar gevolglik aandag aan enkele ekonomiese groeimodelle gegee. Gesien uit die oogpunt van die daarstelling van 'n konsessiepakket om streeksekonomiese ontwikkeling te stimuleer, is die huidige konsessiepakket met die determinante van investering vergelyk. Daardeur word die kwessie aangeraak of die konsessiepakket weI die teoretiese determinante van investering in ag geneem het. Die belangrike vraag of die nyweraars self met die konsessiepakket tevrede is, word in die empiriese studie behandel. Die langtermynaard van 'n investering sal die weldeurdagte investeerder dwing om 'n verdere determinant, naamlik die land as risikofaktor deeglik in ag te neem. Met hierdie veronderstelling word daar in hoofstuk 2 na die land waar die investering oorweeg sal word, naamlik Suid-Afrika gekyk. Daar word veral aan die ekonomiese ontwikkeling van Suid-Afrika aandag gegee. In hierdie opsig word die ongelyke verdeling van inkome wat gedurende die jare al hoe meer beklemtoon is, bespreek en word daar na owerheidspogings gekyk om die probleem op streeksvlak teen te werk. Hierdie owerheidspogings konsentreer helaas op die daarstelling van 'n streeksekonomiese beleid wat moes meehelp om die geografiese verskille in die verdeling van inkome teen te werk. Die streeksekonomiese beleid het gestalte gekry in die vorm van 'n konsessiepakket wat dan ook in hierdie hoofstuk bespreek word. Aangesien die konsessiepakket daarop ingestel was om nyweraars na gedesentraliseerde gebiede te lok, is dit 'n voorwaarde vir die sukses van streeksekonomiese beleid dat nyweraars wat gedesentraliseer het met die konsessiepakket tevrede moet wees. Die navorsingsmetodiek wat gevolg is om hierdie vraag te probeer beantwoord word in hoofstuk 3 bespreek. Daar word in hierdie hoofstuk na die onderwerp, die hipotese, die vraelys en die beantwoordingsmetode gekyk. Hierdie hoofstuk dien dus as 'n skakel tussen die eerste twee hoofstukke wat hoofsaaklik oor die normatiewe en teoretiese aspekte van investering gehandel het en hoofstuk 4 wat die navorsingsresultate oftewel die werklikheid verteenwoordig. Die hipotese dat gedesentraliseerde nywerhede nie met die konsessiepakket tevrede is nie, word in hoofstuk 4 met die navorsingsresultate vergelyk en daar word ook na die verskille wat tussen die Grens, Ciskei en Transkei voorgekom het, gekyk. Die beleidsimplikasies van die navorsingsresultate sowel as In samevatting van die verhandeling word in hoofstuk 5 behandel terwyl daar ook na die implikasies ten opsigte van die huidige debat in die ontwikkelingsekonomie gekyk word (Introduction, p. ix-xi)
- Full Text:
- Date Issued: 1987
- Authors: O'Neill, Richard Charles
- Date: 1987
- Subjects: Investments -- South Africa -- Ciskei , Investments -- South Africa -- Transkei
- Language: Afrikaans
- Type: Thesis , Doctoral , PhD
- Identifier: vital:924 , http://hdl.handle.net/10962/d1001450
- Description: Die langtermynaard van 'n investering noop die voornemende investeerder om meer omsigtig te beplan as in die geval van 'n belegging wat gewoonlik oor 'n korter termyn strek. Die voornemende investeerder moet besef dat 'n investeringsbesluit nie in isolasie van eksterne faktore geneem kan word nie. Dit is daarom raadsaam dat die voornemende investeerder hom deeglik van die makro- en mikro ekonomiese milieu waarbinne die investering beoog word, sal vergewis. Ten einde die kompleksiteit van investeringsbesluitneming op te helder, word daareerstens in hoofstuk 1 op die begrip van investering gekonsentreer. Voorts word die beginsel dat die investeringsbesluit nie in isolasie geneem kan word nie, beklemtoon. In hierdie opsig word daar veral na die determinante van investering gekyk. In makro-ekonomiese verband word die gedagte sterk beklemtoon dat investering nodig is om kapitaalvorming te laat plaasvind wat op sy beurt een van die vereistes is om ontwikkeling te bevorder. As gevolg van meningsverskille ten opsigte van die invloed van investering in ontwikkelde teenoor ontwikkelende lande is daar gevolglik aandag aan enkele ekonomiese groeimodelle gegee. Gesien uit die oogpunt van die daarstelling van 'n konsessiepakket om streeksekonomiese ontwikkeling te stimuleer, is die huidige konsessiepakket met die determinante van investering vergelyk. Daardeur word die kwessie aangeraak of die konsessiepakket weI die teoretiese determinante van investering in ag geneem het. Die belangrike vraag of die nyweraars self met die konsessiepakket tevrede is, word in die empiriese studie behandel. Die langtermynaard van 'n investering sal die weldeurdagte investeerder dwing om 'n verdere determinant, naamlik die land as risikofaktor deeglik in ag te neem. Met hierdie veronderstelling word daar in hoofstuk 2 na die land waar die investering oorweeg sal word, naamlik Suid-Afrika gekyk. Daar word veral aan die ekonomiese ontwikkeling van Suid-Afrika aandag gegee. In hierdie opsig word die ongelyke verdeling van inkome wat gedurende die jare al hoe meer beklemtoon is, bespreek en word daar na owerheidspogings gekyk om die probleem op streeksvlak teen te werk. Hierdie owerheidspogings konsentreer helaas op die daarstelling van 'n streeksekonomiese beleid wat moes meehelp om die geografiese verskille in die verdeling van inkome teen te werk. Die streeksekonomiese beleid het gestalte gekry in die vorm van 'n konsessiepakket wat dan ook in hierdie hoofstuk bespreek word. Aangesien die konsessiepakket daarop ingestel was om nyweraars na gedesentraliseerde gebiede te lok, is dit 'n voorwaarde vir die sukses van streeksekonomiese beleid dat nyweraars wat gedesentraliseer het met die konsessiepakket tevrede moet wees. Die navorsingsmetodiek wat gevolg is om hierdie vraag te probeer beantwoord word in hoofstuk 3 bespreek. Daar word in hierdie hoofstuk na die onderwerp, die hipotese, die vraelys en die beantwoordingsmetode gekyk. Hierdie hoofstuk dien dus as 'n skakel tussen die eerste twee hoofstukke wat hoofsaaklik oor die normatiewe en teoretiese aspekte van investering gehandel het en hoofstuk 4 wat die navorsingsresultate oftewel die werklikheid verteenwoordig. Die hipotese dat gedesentraliseerde nywerhede nie met die konsessiepakket tevrede is nie, word in hoofstuk 4 met die navorsingsresultate vergelyk en daar word ook na die verskille wat tussen die Grens, Ciskei en Transkei voorgekom het, gekyk. Die beleidsimplikasies van die navorsingsresultate sowel as In samevatting van die verhandeling word in hoofstuk 5 behandel terwyl daar ook na die implikasies ten opsigte van die huidige debat in die ontwikkelingsekonomie gekyk word (Introduction, p. ix-xi)
- Full Text:
- Date Issued: 1987
Studies on the gastric proteases in three South African snake species
- Robertson, Sirion Sholto Douglas
- 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.
- Full Text:
- Date Issued: 1987
- 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.
- Full Text:
- Date Issued: 1987
The development of athletics in South Africa: 1814 to 1914
- Authors: Coghlan, Douglas Victor
- Date: 1987
- Subjects: Athletics -- South Africa -- History
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/60785 , vital:27830
- Description: The purpose of this study was to record the development of athletics in South Africa from 1814 to 1914. This period was chosen because sport and athletics originated and developed a social institution during that time and the First World brought progress to a temporary halt, after which there were many new developments. The Cape Colony became British in 1814, and it was British influence that played such a dominant role in the social history of the period.
- Full Text:
- Date Issued: 1987
- Authors: Coghlan, Douglas Victor
- Date: 1987
- Subjects: Athletics -- South Africa -- History
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/60785 , vital:27830
- Description: The purpose of this study was to record the development of athletics in South Africa from 1814 to 1914. This period was chosen because sport and athletics originated and developed a social institution during that time and the First World brought progress to a temporary halt, after which there were many new developments. The Cape Colony became British in 1814, and it was British influence that played such a dominant role in the social history of the period.
- Full Text:
- Date Issued: 1987
An intelligent computer-based tutor for elementary mechanics problems
- Authors: Oberem, Graham Edmund
- Date: 1987
- Subjects: Physics -- Programmed instruction Physics -- Computer-assisted instruction
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5444 , http://hdl.handle.net/10962/d1001997
- Description: ALBERT, an intelligent problem-solving monitor and coach, has been developed to assist students solving problems in one-dimensional kinematics. Students may type in kinematics problems directly from their textbooks. ALBERT understands the problems, knows how to solve them, and can teach students how to solve them. The program is implemented in the TUTOR language and runs on the Control Data mainframe PLATO system. A natural language interface was designed to understand kinematics problems stated in textbook English. The interface is based on a pattern recognition system which is intended to parallel a cognitive model of language processing. The natural language system has understood over 60 problems taken directly from elementary Physics textbooks. Two problem-solving routines are included in ALBERT. One is goal-directed and solves the problems using the standard kinematic equations. The other uses the definition of acceleration and the relationship between displacement and average velocity to solve the problems. It employs a forward-directed problem-solving strategy. The natural language interface and both the problem-solvers are fast and completely adequate for the task. The tutorial dialogue system uses a modified version of the natural language interface which operates in a two-tier fashion. First an attempt is made to understand the input with the pattern recognition system, and if that fails, a keyword matching system is invoked. The result has been a fairly robust language interface. The tutorial is driven by a tutorial management system (embodying a tutorial model) and a context model. The context model consists of a student model, a tutorial status model and a dynamic dialogue model. ALBERT permits a mixed initiative dialogue in the discussion of a problem. The system has been tested by Physics students in more than 80 problemsolving sessions and the results have been good. The response of the students has been very favourable
- Full Text:
- Date Issued: 1987
- Authors: Oberem, Graham Edmund
- Date: 1987
- Subjects: Physics -- Programmed instruction Physics -- Computer-assisted instruction
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5444 , http://hdl.handle.net/10962/d1001997
- Description: ALBERT, an intelligent problem-solving monitor and coach, has been developed to assist students solving problems in one-dimensional kinematics. Students may type in kinematics problems directly from their textbooks. ALBERT understands the problems, knows how to solve them, and can teach students how to solve them. The program is implemented in the TUTOR language and runs on the Control Data mainframe PLATO system. A natural language interface was designed to understand kinematics problems stated in textbook English. The interface is based on a pattern recognition system which is intended to parallel a cognitive model of language processing. The natural language system has understood over 60 problems taken directly from elementary Physics textbooks. Two problem-solving routines are included in ALBERT. One is goal-directed and solves the problems using the standard kinematic equations. The other uses the definition of acceleration and the relationship between displacement and average velocity to solve the problems. It employs a forward-directed problem-solving strategy. The natural language interface and both the problem-solvers are fast and completely adequate for the task. The tutorial dialogue system uses a modified version of the natural language interface which operates in a two-tier fashion. First an attempt is made to understand the input with the pattern recognition system, and if that fails, a keyword matching system is invoked. The result has been a fairly robust language interface. The tutorial is driven by a tutorial management system (embodying a tutorial model) and a context model. The context model consists of a student model, a tutorial status model and a dynamic dialogue model. ALBERT permits a mixed initiative dialogue in the discussion of a problem. The system has been tested by Physics students in more than 80 problemsolving sessions and the results have been good. The response of the students has been very favourable
- Full Text:
- Date Issued: 1987
The law of culpable homicide in South Africa : with reference to the law of manslaughter in English law and the law related to negligent killing in German law
- Authors: du Plessis, J R
- Date: 1987
- Subjects: Homicide -- Law and legislation -- South Africa Homicide -- Law and legislation -- England Homicide -- Law and legislation -- Germany (West)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3670 , http://hdl.handle.net/10962/d1003185
- Description: Culpable homicide is the unlawful negligent killing of a fellow human being. As such it is in many respects a 'residual' crime being the verdict prosecutors may expect when they are unable to prove the intention to kill when prosecuting for murder. A feature of this was that in the past when defences such as, for instance, intoxication or provocation were raised at murder trials, convictions of culpable homicide were almost automatic. In recent years, under the influence of the 'purist' current in our Criminal law, intoxication has become a defence to culpable homicide and provocation resulting in loss of self-control has also become a defence to culpable homicide. These developments are unacceptable to some writers on criminal law and a move away from the purist approach to the 'traditional' or pragmatic approach is to be expected. Greater emphasis will be placed on practical results than on the achievement of logical consistency. This could result in the law of culpable homicide becoming more socially effective than it is at present.
- Full Text:
- Date Issued: 1987
- Authors: du Plessis, J R
- Date: 1987
- Subjects: Homicide -- Law and legislation -- South Africa Homicide -- Law and legislation -- England Homicide -- Law and legislation -- Germany (West)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3670 , http://hdl.handle.net/10962/d1003185
- Description: Culpable homicide is the unlawful negligent killing of a fellow human being. As such it is in many respects a 'residual' crime being the verdict prosecutors may expect when they are unable to prove the intention to kill when prosecuting for murder. A feature of this was that in the past when defences such as, for instance, intoxication or provocation were raised at murder trials, convictions of culpable homicide were almost automatic. In recent years, under the influence of the 'purist' current in our Criminal law, intoxication has become a defence to culpable homicide and provocation resulting in loss of self-control has also become a defence to culpable homicide. These developments are unacceptable to some writers on criminal law and a move away from the purist approach to the 'traditional' or pragmatic approach is to be expected. Greater emphasis will be placed on practical results than on the achievement of logical consistency. This could result in the law of culpable homicide becoming more socially effective than it is at present.
- Full Text:
- Date Issued: 1987
An empirical phenomenological study of happiness
- Authors: Parker, Peter Burns
- Date: 1987
- Subjects: Happiness
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2912 , http://hdl.handle.net/10962/d1002077
- Description: The aim of this study was to investigate man's attunement when happy. Having established a question which would elicit actual experiences of this phenomenon, the researcher collected sixty-four written accounts of the experience. Of these he chose the twelve psychologically richest accounts and, having interviewed each of these twelve subjects to push their written descriptions to their limits, he analysed the resulting protocols using an empirical phenomenological method. The general structure of the experience of happiness suggested that happiness emerged as a special openness against a background where individuals were less than happy. During happiness there is a breaking through the bonds of the individual's mundane, everyday disclosure of the world. It transports the individual to an existence in which the ruptures which form part of man's lived relationships to himself, to his fellowman, to the world and to life itself are healed, and in which life is lived in increased harmony with all. There is a coming home to the self, a move toward wholeness which is enlivened bodily by a radiating vibrancy (often a tingling lightness and brightness), as the individual expands with energy, power, self-confidence and mastery, and rises above the troubles of life. This structure of happiness was dialogued with the writing of existential philosophers and psychologists, psychoanalysts and humanists
- Full Text:
- Date Issued: 1987
- Authors: Parker, Peter Burns
- Date: 1987
- Subjects: Happiness
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2912 , http://hdl.handle.net/10962/d1002077
- Description: The aim of this study was to investigate man's attunement when happy. Having established a question which would elicit actual experiences of this phenomenon, the researcher collected sixty-four written accounts of the experience. Of these he chose the twelve psychologically richest accounts and, having interviewed each of these twelve subjects to push their written descriptions to their limits, he analysed the resulting protocols using an empirical phenomenological method. The general structure of the experience of happiness suggested that happiness emerged as a special openness against a background where individuals were less than happy. During happiness there is a breaking through the bonds of the individual's mundane, everyday disclosure of the world. It transports the individual to an existence in which the ruptures which form part of man's lived relationships to himself, to his fellowman, to the world and to life itself are healed, and in which life is lived in increased harmony with all. There is a coming home to the self, a move toward wholeness which is enlivened bodily by a radiating vibrancy (often a tingling lightness and brightness), as the individual expands with energy, power, self-confidence and mastery, and rises above the troubles of life. This structure of happiness was dialogued with the writing of existential philosophers and psychologists, psychoanalysts and humanists
- Full Text:
- Date Issued: 1987
Xhosa beer drinks and their oratory
- Authors: McAllister, Patrick A
- Date: 1987
- Subjects: Beer -- Social aspects -- South Africa , Drinking customs -- South Africa , Xhosa (African people) -- Social life and customs
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2120 , http://hdl.handle.net/10962/d1012863
- Description: This is a study of 'beer drinks' among Xhosa people living in the Shixini administrative area of Willowvale district, Transkei. Beer drinks are defined as a 'polythetic' class of events distinguishable from other kinds of ceremonies and rituals at which beer may be consumed, and an attempt is made to outline their major characteristics. A detailed description of the way in which beer drinks are conducted is provided in Chapter 3, with emphasis on the symbolism involved in the allocation of beer, space and time, and on the speech events (including formal oratory) that occur. The main theoretical argument is that beer drinks may be regarded as 'cultural performances' in which social reality or 'practice' is dramatised and reflected upon, enabling people to infuse their experience with meaning and to establish guidelines for future action. This is achieved by relating social practice to cultural norms and values, in a dynamic rather than a static manner. It is demonstrated that the symbolism involved in beer drinking is highly sensitive to the real world and adjusts accordingly, which means that 'culture' is continually being reinterpreted. Despite poverty, a degree of landlessness and heavy reliance on migrant labour, Shixini people maintain an ideal of rural selfsufficiency and are able to partly fulfill this ideal, thereby maintaining a degree of independence and resistance to full incorporation into the wider political economy of southern Africa. They achieve this largely by maintaining a strong sense of community and of household interdependence, linked to a sense of Xhosa tradition. It is this aspect of social practice, manifested in a variety of forms - work parties, ploughing companies, rites of passage, and so on - that is dramatised, reflected upon and reinforced at beer drinks. In a definite sense then, beer drinks may be regarded as a response and a way of adapting to apartheid, and this study one of a community under threat.
- Full Text:
- Date Issued: 1987
- Authors: McAllister, Patrick A
- Date: 1987
- Subjects: Beer -- Social aspects -- South Africa , Drinking customs -- South Africa , Xhosa (African people) -- Social life and customs
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2120 , http://hdl.handle.net/10962/d1012863
- Description: This is a study of 'beer drinks' among Xhosa people living in the Shixini administrative area of Willowvale district, Transkei. Beer drinks are defined as a 'polythetic' class of events distinguishable from other kinds of ceremonies and rituals at which beer may be consumed, and an attempt is made to outline their major characteristics. A detailed description of the way in which beer drinks are conducted is provided in Chapter 3, with emphasis on the symbolism involved in the allocation of beer, space and time, and on the speech events (including formal oratory) that occur. The main theoretical argument is that beer drinks may be regarded as 'cultural performances' in which social reality or 'practice' is dramatised and reflected upon, enabling people to infuse their experience with meaning and to establish guidelines for future action. This is achieved by relating social practice to cultural norms and values, in a dynamic rather than a static manner. It is demonstrated that the symbolism involved in beer drinking is highly sensitive to the real world and adjusts accordingly, which means that 'culture' is continually being reinterpreted. Despite poverty, a degree of landlessness and heavy reliance on migrant labour, Shixini people maintain an ideal of rural selfsufficiency and are able to partly fulfill this ideal, thereby maintaining a degree of independence and resistance to full incorporation into the wider political economy of southern Africa. They achieve this largely by maintaining a strong sense of community and of household interdependence, linked to a sense of Xhosa tradition. It is this aspect of social practice, manifested in a variety of forms - work parties, ploughing companies, rites of passage, and so on - that is dramatised, reflected upon and reinforced at beer drinks. In a definite sense then, beer drinks may be regarded as a response and a way of adapting to apartheid, and this study one of a community under threat.
- Full Text:
- Date Issued: 1987
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