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
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
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 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 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
The effects of relative speed on selected physiological, kinematic and psychological responses at walk-to-run and run-to-walk interfaces.
- Authors: Candler, Paul David
- Date: 1987
- Subjects: Walking -- Physiological aspects , Running -- Physiological aspects
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5164 , http://hdl.handle.net/10962/d1016081
- Description: [Conclusions] l) The two forms of human locomotion, walking and running, are distinctly different and in evaluating these gait patterns consideration must be given to this fact. 2) The impression created by the energy cost curves, that there is a single locomotor interface for both walking and running is a false one . There are two distinctly different locomotor interfaces, the walk-to-run interface and the run-to-walk interface. The former appears to correspond with the "metabolic intersection point" and therefore has some metabolic significance. The latter appears to be merely an "overshoot" of the walk-to-run interface and presently has no apparent metabolic significance. 3) Because the walk-to-run interface speed corresponds with the intersection point of the energy cost curves, physiological responses to walking and running at this speed do not differ significantly. However, cadence and stride length patterns for these two locomotor patterns are distinctly different at this point. 4) The identification of single physiological or kinematic factors during perceptions of exertion in any given situation is an extremely difficult if not impossible task. Perceived exertion should therefore be considered a multi-factorial concept and should be evaluated as such. 5) The use of relative speed as a technique for reducing inter-subject variability in physiological and kinematic factors is worthless unless diverse ranges in morphological linearity are a characteristic of one's subject pool
- Full Text:
- Date Issued: 1987
- Authors: Candler, Paul David
- Date: 1987
- Subjects: Walking -- Physiological aspects , Running -- Physiological aspects
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5164 , http://hdl.handle.net/10962/d1016081
- Description: [Conclusions] l) The two forms of human locomotion, walking and running, are distinctly different and in evaluating these gait patterns consideration must be given to this fact. 2) The impression created by the energy cost curves, that there is a single locomotor interface for both walking and running is a false one . There are two distinctly different locomotor interfaces, the walk-to-run interface and the run-to-walk interface. The former appears to correspond with the "metabolic intersection point" and therefore has some metabolic significance. The latter appears to be merely an "overshoot" of the walk-to-run interface and presently has no apparent metabolic significance. 3) Because the walk-to-run interface speed corresponds with the intersection point of the energy cost curves, physiological responses to walking and running at this speed do not differ significantly. However, cadence and stride length patterns for these two locomotor patterns are distinctly different at this point. 4) The identification of single physiological or kinematic factors during perceptions of exertion in any given situation is an extremely difficult if not impossible task. Perceived exertion should therefore be considered a multi-factorial concept and should be evaluated as such. 5) The use of relative speed as a technique for reducing inter-subject variability in physiological and kinematic factors is worthless unless diverse ranges in morphological linearity are a characteristic of one's subject pool
- Full Text:
- Date Issued: 1987
The exploration and evaluation of groundwater units south and west of Graaf-Reinet, Cape Province, South Africa
- Authors: Parsons, Roger Paul
- Date: 1987 , 2013-04-18
- Subjects: Hydrogeology -- South Africa , Aquifers -- South Africa -- Graaff-Reinet , Groundwater -- South Africa -- Graaff-Reinet
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4865 , http://hdl.handle.net/10962/d1007351 , Hydrogeology -- South Africa , Aquifers -- South Africa -- Graaff-Reinet , Groundwater -- South Africa -- Graaff-Reinet
- Description: The investigation reported in the thesis concerns an area south and west of Graaff-Reinet, in the Cape Province. The research projec t identified the existence of four groundwater units. The aquifers predominantly occur in Beaufort Group sediments and the boundary of each unit is formed by dolerite intrusives or with topographical highs. The objective of the study was to quantitatively assess these units in terms of both quantity and quality for possible future development as a municipal supply for Graaff-Reinet. In order to achieve the objective, fieldwork was carried out involving a hydrocensus, geological mapping, drilling, aquifer testing and hydrochemical sampling. The analysis of these data revealed that the Sundays and Kamdeboo aquifer units are unsuitable for further development. The Moordenaars and Swart units, both of which produce good quality water, have a combined exploitation potential in the order of 30 000 m³ /d. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
- Authors: Parsons, Roger Paul
- Date: 1987 , 2013-04-18
- Subjects: Hydrogeology -- South Africa , Aquifers -- South Africa -- Graaff-Reinet , Groundwater -- South Africa -- Graaff-Reinet
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4865 , http://hdl.handle.net/10962/d1007351 , Hydrogeology -- South Africa , Aquifers -- South Africa -- Graaff-Reinet , Groundwater -- South Africa -- Graaff-Reinet
- Description: The investigation reported in the thesis concerns an area south and west of Graaff-Reinet, in the Cape Province. The research projec t identified the existence of four groundwater units. The aquifers predominantly occur in Beaufort Group sediments and the boundary of each unit is formed by dolerite intrusives or with topographical highs. The objective of the study was to quantitatively assess these units in terms of both quantity and quality for possible future development as a municipal supply for Graaff-Reinet. In order to achieve the objective, fieldwork was carried out involving a hydrocensus, geological mapping, drilling, aquifer testing and hydrochemical sampling. The analysis of these data revealed that the Sundays and Kamdeboo aquifer units are unsuitable for further development. The Moordenaars and Swart units, both of which produce good quality water, have a combined exploitation potential in the order of 30 000 m³ /d. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
The fellowship experience : an investigation into the shared exploration of children's fiction by teacher and pupils in the senior primary school
- Authors: Haschick, J D
- Date: 1987
- Subjects: Children's stories -- Study and teaching (Elementary) , English literature -- Study and teaching (Elementary) -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1374 , http://hdl.handle.net/10962/d1001440
- Full Text:
- Date Issued: 1987
- Authors: Haschick, J D
- Date: 1987
- Subjects: Children's stories -- Study and teaching (Elementary) , English literature -- Study and teaching (Elementary) -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1374 , http://hdl.handle.net/10962/d1001440
- Full Text:
- Date Issued: 1987
The fourteen last rondos of C P E Bach: an investigation into their historic position, their form and their style
- Authors: Lewis, Pauline Mary
- Date: 1987
- Subjects: Bach, Carl Philipp Emanuel, 1714-1788 -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2663 , http://hdl.handle.net/10962/d1004608
- Description: This thesis deals with a set of compositions by C. P.E. Bach, referred to as "The Last Fourteen Rondos". Thirteen of these are contained in the collections of sonatas, fantasias and rondos for connoisseurs and music lovers. The fourteenth is a separate work, entitled "The Farewell From a Silbermann Clavier in the Form of a Rondo". After establishing the background and the history of these rondos, the thesis then proceeds to a detailed analysis of the various compositional aspects. First, it tries to explain the overall design of the rondos, a design which differs from that normally associated with rondo form. It then deals with the structure of the thematic material and shows Bach's preference for phrase parallelism and a relatively simple melodic and harmonic outline of the various subjects. Special chapters are devoted to the manner in which C.P.E. Bach treats the musical substance, namely, by means of Variation and by systematic development. A short chapter is then devoted to the fantasia sections, which are included into most of the rondos. It is in the field of harmony where C.P.E. Bach emerges as a most important forerunner of nineteenth century musical trends and, consequently, some detailed analyses form a major portion of the chapter dealing with harmony. Special attention is then given to the various aspects of C.P.E. Bach's style and, in particular, to the pianistic · traits. The thesis ends with a brief survey of the influence which C.P.E. Bach exerted on his contemporaries and on later composers.
- Full Text:
- Date Issued: 1987
- Authors: Lewis, Pauline Mary
- Date: 1987
- Subjects: Bach, Carl Philipp Emanuel, 1714-1788 -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2663 , http://hdl.handle.net/10962/d1004608
- Description: This thesis deals with a set of compositions by C. P.E. Bach, referred to as "The Last Fourteen Rondos". Thirteen of these are contained in the collections of sonatas, fantasias and rondos for connoisseurs and music lovers. The fourteenth is a separate work, entitled "The Farewell From a Silbermann Clavier in the Form of a Rondo". After establishing the background and the history of these rondos, the thesis then proceeds to a detailed analysis of the various compositional aspects. First, it tries to explain the overall design of the rondos, a design which differs from that normally associated with rondo form. It then deals with the structure of the thematic material and shows Bach's preference for phrase parallelism and a relatively simple melodic and harmonic outline of the various subjects. Special chapters are devoted to the manner in which C.P.E. Bach treats the musical substance, namely, by means of Variation and by systematic development. A short chapter is then devoted to the fantasia sections, which are included into most of the rondos. It is in the field of harmony where C.P.E. Bach emerges as a most important forerunner of nineteenth century musical trends and, consequently, some detailed analyses form a major portion of the chapter dealing with harmony. Special attention is then given to the various aspects of C.P.E. Bach's style and, in particular, to the pianistic · traits. The thesis ends with a brief survey of the influence which C.P.E. Bach exerted on his contemporaries and on later composers.
- Full Text:
- Date Issued: 1987
The geology and alteration/mineralization of the Van Rooi's vley W/Sn deposit, Namaqua metamorphic complex, South Africa
- Authors: Smithies, Robert Hugh
- Date: 1987 , 2013-03-01
- Subjects: Mineralogy -- South Africa , Geology -- South Africa -- Namaqualand
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4924 , http://hdl.handle.net/10962/d1004526 , Mineralogy -- South Africa , Geology -- South Africa -- Namaqualand
- Description: Scheelite, wolfram Ite and cassIterIte mIneralizat ion is hosted wIthin numerous quartz-tourmaline-feldspar-fluorite veins at Van Rooi's Vley, N.W. Cape Province . MineralizatIon and hydrothermal alteration within, and around, these veins is hIghly complex and reflects the intricate interaction of hydrotherma l activity upon a structurally deformed sequence of ProterozoIc med ium to high-grade gneisses. Four distinct stages of alteration and mineralization occurred, including a l ate 'epithermal stage'. Although the location of mineralization was strongly controlled by st ructure, the concentration of mineralizati on was controlled by physicochemical variables, of which host-rock geochemistry was particularly important . Further W/Sn mineralization occurs on a local scale, some of which is spatia lly related to minor leucogranite dykes. Leucogranite bodies are not uncommon within the region and some are enriched in Wand Sn. By comparing FIB ra tio s,W/Sn ratios, the alteration mineralogy, the ore mineralogy and the Fe-content of tourmaline, the deposits within the Van Rooi's Vley area can be placed into a 'proximal' to 'distal' classification, with respect to a common source of mineralizing hydrothermal fluids. The Van Rooi's Vley deposit, whilst affiliated to greisen-style deposits, represents a ' distal' quartz-vein lode deposit. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
- Authors: Smithies, Robert Hugh
- Date: 1987 , 2013-03-01
- Subjects: Mineralogy -- South Africa , Geology -- South Africa -- Namaqualand
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4924 , http://hdl.handle.net/10962/d1004526 , Mineralogy -- South Africa , Geology -- South Africa -- Namaqualand
- Description: Scheelite, wolfram Ite and cassIterIte mIneralizat ion is hosted wIthin numerous quartz-tourmaline-feldspar-fluorite veins at Van Rooi's Vley, N.W. Cape Province . MineralizatIon and hydrothermal alteration within, and around, these veins is hIghly complex and reflects the intricate interaction of hydrotherma l activity upon a structurally deformed sequence of ProterozoIc med ium to high-grade gneisses. Four distinct stages of alteration and mineralization occurred, including a l ate 'epithermal stage'. Although the location of mineralization was strongly controlled by st ructure, the concentration of mineralizati on was controlled by physicochemical variables, of which host-rock geochemistry was particularly important . Further W/Sn mineralization occurs on a local scale, some of which is spatia lly related to minor leucogranite dykes. Leucogranite bodies are not uncommon within the region and some are enriched in Wand Sn. By comparing FIB ra tio s,W/Sn ratios, the alteration mineralogy, the ore mineralogy and the Fe-content of tourmaline, the deposits within the Van Rooi's Vley area can be placed into a 'proximal' to 'distal' classification, with respect to a common source of mineralizing hydrothermal fluids. The Van Rooi's Vley deposit, whilst affiliated to greisen-style deposits, represents a ' distal' quartz-vein lode deposit. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
The Hasidic spirit as the foundation of the art of Marc Chagall
- Authors: Bagraim, Abigail Sarah
- Date: 1987
- Subjects: Chagall, Marc, 1887-1985 Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2393 , http://hdl.handle.net/10962/d1002189
- Description: In considering Chagall's art the observer is immediately struck by the constancy of his almost obsessive repetition of certain symbols and themes. In this way Chagall has created his own fantasy world, one with which the observer soon becomes acquainted and grows to love and understand.
- Full Text:
- Date Issued: 1987
- Authors: Bagraim, Abigail Sarah
- Date: 1987
- Subjects: Chagall, Marc, 1887-1985 Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2393 , http://hdl.handle.net/10962/d1002189
- Description: In considering Chagall's art the observer is immediately struck by the constancy of his almost obsessive repetition of certain symbols and themes. In this way Chagall has created his own fantasy world, one with which the observer soon becomes acquainted and grows to love and understand.
- Full Text:
- Date Issued: 1987
The interpersonal dimension of psychopathology
- Authors: O'Dowd, S A
- Date: 1987
- Subjects: Psychology, Pathological
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2910 , http://hdl.handle.net/10962/d1002075
- Description: It is argued that two large groups of disorders can be distinguished in the field of psychopathology, (1) which divide between them the psychoses, neuroses and personality disorders; ( 2) the dynamics of which are those of Klein's paranoid-schizoid and depressive positions, respectively; and (3) which are distinguished by nine basic contrasts in symptomatology and dynamics, all of which are expressive of the opposition self-centred/other-centred. These three hypotheses form the interpersonal model of psychopathology, and are supported by argument from works of Foulds, Jung, Abraham, Fairbairn, Klein, Angyal, Winnicott and Heidegger. It is suggested that the interpersonal model can facilitate the dialogue between psychoanalysis and phenomenology
- Full Text:
- Date Issued: 1987
- Authors: O'Dowd, S A
- Date: 1987
- Subjects: Psychology, Pathological
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2910 , http://hdl.handle.net/10962/d1002075
- Description: It is argued that two large groups of disorders can be distinguished in the field of psychopathology, (1) which divide between them the psychoses, neuroses and personality disorders; ( 2) the dynamics of which are those of Klein's paranoid-schizoid and depressive positions, respectively; and (3) which are distinguished by nine basic contrasts in symptomatology and dynamics, all of which are expressive of the opposition self-centred/other-centred. These three hypotheses form the interpersonal model of psychopathology, and are supported by argument from works of Foulds, Jung, Abraham, Fairbairn, Klein, Angyal, Winnicott and Heidegger. It is suggested that the interpersonal model can facilitate the dialogue between psychoanalysis and phenomenology
- 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
The musician, the philosopher and the king : an investigation into the relationship of Richard Wagner with Friedrich Nietzsche and Ludwig II of Bavaria
- Authors: Gale, Felicity Margaret
- Date: 1987
- Subjects: Wagner, Richard, 1813-1883 Nietzsche, Friedrich Wilhelm, 1844-1900 -- Influence Ludwig II, King of Bavaria, 1845-1886
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2660 , http://hdl.handle.net/10962/d1004506
- Full Text:
- Date Issued: 1987
- Authors: Gale, Felicity Margaret
- Date: 1987
- Subjects: Wagner, Richard, 1813-1883 Nietzsche, Friedrich Wilhelm, 1844-1900 -- Influence Ludwig II, King of Bavaria, 1845-1886
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2660 , http://hdl.handle.net/10962/d1004506
- Full Text:
- Date Issued: 1987
The origins, development and demise of the South African Indian Council 1964-1983 : a sociological interpretation
- Authors: Desai, Ashwin
- Date: 1987
- Subjects: South African Indian Council -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3349 , http://hdl.handle.net/10962/d1007082 , South African Indian Council -- History
- Description: It was the actions of the Congress Alliance that dominated the political activity of the dominated classes in the 1950s. Mobilising across class and colour lines, the actions of the Congress Alliance had witnessed a growing unity between the leading political organisations of the Indian, African and Coloured dominated classes. However just as quickly as it appeared, the Congress Alliance disappeared from the poitical scene, crushed by the state's repressive apparatus. The state, in order to ensure that the extra-parliamentary opposition characteristic of the 1950s did not once again re-emerge, sought to divide the dominated classes more systematically along ethnic and racial lines by creating mechanisms for the implementation of the policy of separate development. It is within this context that the Promotion of Bantu-Self-Government Act of 1959 was passed and the Coloured Persons' Representative Council (CRC) and the ' South African Indian Council (SAIC) were established. Whilst the history of Indian political organisations in the pre-1960 period has been extensively researched, no in-depth study of the SAIC has been made. Probably the main reason for this area being under-researched, has been the inability of researchers to gain access to information on the SAlC, especially of the period covering the early years of the organisation’ s existence. This study aims to fill this vacuum by utilizing in the main previously unused minutes of the SAlC from 1964 to 1977 together with numerous documents and memoranda presented to the South African government by SAlC delegations in the aforementioned period.
- Full Text:
- Date Issued: 1987
- Authors: Desai, Ashwin
- Date: 1987
- Subjects: South African Indian Council -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3349 , http://hdl.handle.net/10962/d1007082 , South African Indian Council -- History
- Description: It was the actions of the Congress Alliance that dominated the political activity of the dominated classes in the 1950s. Mobilising across class and colour lines, the actions of the Congress Alliance had witnessed a growing unity between the leading political organisations of the Indian, African and Coloured dominated classes. However just as quickly as it appeared, the Congress Alliance disappeared from the poitical scene, crushed by the state's repressive apparatus. The state, in order to ensure that the extra-parliamentary opposition characteristic of the 1950s did not once again re-emerge, sought to divide the dominated classes more systematically along ethnic and racial lines by creating mechanisms for the implementation of the policy of separate development. It is within this context that the Promotion of Bantu-Self-Government Act of 1959 was passed and the Coloured Persons' Representative Council (CRC) and the ' South African Indian Council (SAIC) were established. Whilst the history of Indian political organisations in the pre-1960 period has been extensively researched, no in-depth study of the SAIC has been made. Probably the main reason for this area being under-researched, has been the inability of researchers to gain access to information on the SAlC, especially of the period covering the early years of the organisation’ s existence. This study aims to fill this vacuum by utilizing in the main previously unused minutes of the SAlC from 1964 to 1977 together with numerous documents and memoranda presented to the South African government by SAlC delegations in the aforementioned period.
- Full Text:
- Date Issued: 1987
The P.R.O. expert system shell
- Authors: Bradshaw, John
- Date: 1987 , 2013-04-03
- Subjects: Expert systems (Computer science)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4617 , http://hdl.handle.net/10962/d1006302 , Expert systems (Computer science)
- Description: This thesis reports the research which led to the development of the P.R .O. Expert System Shell. The P.R.O . System is primarily, though not exclusively , designed for use in ecological domains. In the light of two specific expert systems, The RCS (River Conservation Status) and the Aquaculture Systems, which were developed as part of this research, a number of areas of importance have been identified. The most significant of these is the need to handle uncertainty effectively. The style of knowledge representation to be implemented also plays an important role. After consulting the relevant literature and the available microcomputer expert system shells, a number of ideas have been included in the P.R.O. System. The P.R.O . System is a backward chaining, production system based expert system shell. It embodies a simple but effective method of handling uncertainty. An important feature of this method is that it takes cognizance of the different relative importances of the conditions which need to be satisfied before a conclusion can be reached. The knowledge base consists of more than rules and questions. It also contains meta-knowledge, which is used by the inference engine. The P.R.O. System has been designed to be of practical use. Its strongest recommendations are therefore, that the two non-trivial systems which have been implemented in it, have been accepted by the experts and their peers as systems which produce good, accurate answers . , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
- Authors: Bradshaw, John
- Date: 1987 , 2013-04-03
- Subjects: Expert systems (Computer science)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4617 , http://hdl.handle.net/10962/d1006302 , Expert systems (Computer science)
- Description: This thesis reports the research which led to the development of the P.R .O. Expert System Shell. The P.R.O . System is primarily, though not exclusively , designed for use in ecological domains. In the light of two specific expert systems, The RCS (River Conservation Status) and the Aquaculture Systems, which were developed as part of this research, a number of areas of importance have been identified. The most significant of these is the need to handle uncertainty effectively. The style of knowledge representation to be implemented also plays an important role. After consulting the relevant literature and the available microcomputer expert system shells, a number of ideas have been included in the P.R.O. System. The P.R.O . System is a backward chaining, production system based expert system shell. It embodies a simple but effective method of handling uncertainty. An important feature of this method is that it takes cognizance of the different relative importances of the conditions which need to be satisfied before a conclusion can be reached. The knowledge base consists of more than rules and questions. It also contains meta-knowledge, which is used by the inference engine. The P.R.O. System has been designed to be of practical use. Its strongest recommendations are therefore, that the two non-trivial systems which have been implemented in it, have been accepted by the experts and their peers as systems which produce good, accurate answers . , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
The petrology and geochemistry of the upper critical zone of the Bushveld complex at the Amandelbult section of Rustenberg Platinum Mines Limited, Northwestern Transvaal, South Africa
- Authors: Field, Matthew
- Date: 1987 , 2013-03-06
- Subjects: Geology -- South Africa -- North-Western Transvaal , Petrology -- South Africa -- North-Western Transvaal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5037 , http://hdl.handle.net/10962/d1007499 , Geology -- South Africa -- North-Western Transvaal , Petrology -- South Africa -- North-Western Transvaal
- Description: A study of petrological and geochemical variations through the upper Critical Zone of the Bushveld Complex at Amandelbult section of R.P,M. was undertaken. The sequence at this locality may be divided into seven "units" two of which appear to be complete, possessing the sequence harzburgite-pyroxenite-norite-anorthosite. The other five Units lack basal, intermediate or upper members. Considerable lateral variations are apparent in this sequence, but these are restricted to the Lower Pseudo Reef-Merensky Reef interval, tne same portion of the succession which is affected by pothole structures. The single most important petrographic feature of genetic significance is the occurrence of annealed, recrystallized anorthosite immediately underlying ulstramafic layers. This, together with the undulatory nature of the contact between the two rock layers, suggests that the ultramafic layer was emplaced as a hot liquid over a pre-existing, crystalline anorthosite floor, and that some remelting of this layer occurred. Variations in the chemical make-up of constituent silicate minerals reveal a number of significant processes which may have been operative in the magma chamber prior to crystallization, Olivine grains, for instance, exhibit extremely wide chemical variations both within single layers and from one layer to the next. These variations are best explained by re-equilibration processes with spinel and base metal sulphides, rather than by wide variations in original liquidus compositions. It appears that the compositions of the initial liquids from which each basal olivine-bearing layer crystallized, were approximately similar. Variations in the iron-magnesium ratio of ortho-pyroxenes indicate well defined continuous fractionation trends in units which are considered to be complete. Magnesian compositions are recorded in ultramfic members, while increasingly iron-enriched values are recorded upwards through the sequence pyroxenite-norite-antorthosite. Plagioclase grains exhibit less well defined fractionation trends, but it is clear that an upward increase in An is encountered through indivitual Units. This is in direct contrast to the trend exhibited by orthopyroxene. A further feature of plagioclase grains is the considerable degree of chemical zonation exhibited by them. In cumulus grains this is commonly manifested as strongly reversed rims, while in intercululus grains normal zoning is ubiquitous. Whole-rock chemical variations through the succession indicate that cyclical variations occur through successive Units, but that these merely reflect changes in modal mineralogy and not liquid fractionation trends. Such trends can be shown for selected element ratios, where these elements are known to partition into a single mineral phase. Rations of pyroxene components such as the nickel/scandium ratio, exhibit a saw tooth pattern through successive Units, while ratios of plagioclase components such as the strontium/alumina ratio have unique, fairly constant values for each individual Unit but different values for successive Units. The latter type of cyclicity is not always strictly confined to lithologically recognized boundaries between Units, and a slight overlap into overlying ultramafic layers is apparent. An investigation of variations in trace element levels in a single layer in five widely separated boreholes revealed that there is some evidence for a lateral fractionation trend from the southwest (more primitive) to the northeast (more evolved), although the small number of data points available preclude definite conclusions. There exists in the data some evidence that the Giant Mottled Anorthosite differs chemically from the other anorthosites in the study section, and that it more closely resembles rocks of the Main Zone. This evidence is particularly apparent in variations of the chromium/aluminium ratio of orthoyroxene grains, and in the An content of plagioclase grains, both of whose trends exhibit distinct inflections at the base of this member. The features of the succession at Amandelbult are best explained by the model of Eales et al. (in press, a), which visualizes the input of a number of pulses of new, hot liquid into a magma chamber containing the fractionated residua of previous influxes. At a critical point in time, just prior to the mafic Merensky Reef input, a large input of gabboic liquid was intruded at high levels in the chamber. The lower portions of this liquid mixed with the residua of earlier mafic inputs, which in turn mixed with new inputs of mafic, typical Critical Zone liquids. Thus the lower portions of the study section represent mixtures of new Critical Zone liquids with the residua of previous such influxes, while the upper portions have the added complication of mixture with a Main Zone-type liquid. The unique chemical character of the Giant Mottled Anorthosite appears to be a direct manifestation of the influence of the Main Zone liquid. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 1987
- Authors: Field, Matthew
- Date: 1987 , 2013-03-06
- Subjects: Geology -- South Africa -- North-Western Transvaal , Petrology -- South Africa -- North-Western Transvaal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5037 , http://hdl.handle.net/10962/d1007499 , Geology -- South Africa -- North-Western Transvaal , Petrology -- South Africa -- North-Western Transvaal
- Description: A study of petrological and geochemical variations through the upper Critical Zone of the Bushveld Complex at Amandelbult section of R.P,M. was undertaken. The sequence at this locality may be divided into seven "units" two of which appear to be complete, possessing the sequence harzburgite-pyroxenite-norite-anorthosite. The other five Units lack basal, intermediate or upper members. Considerable lateral variations are apparent in this sequence, but these are restricted to the Lower Pseudo Reef-Merensky Reef interval, tne same portion of the succession which is affected by pothole structures. The single most important petrographic feature of genetic significance is the occurrence of annealed, recrystallized anorthosite immediately underlying ulstramafic layers. This, together with the undulatory nature of the contact between the two rock layers, suggests that the ultramafic layer was emplaced as a hot liquid over a pre-existing, crystalline anorthosite floor, and that some remelting of this layer occurred. Variations in the chemical make-up of constituent silicate minerals reveal a number of significant processes which may have been operative in the magma chamber prior to crystallization, Olivine grains, for instance, exhibit extremely wide chemical variations both within single layers and from one layer to the next. These variations are best explained by re-equilibration processes with spinel and base metal sulphides, rather than by wide variations in original liquidus compositions. It appears that the compositions of the initial liquids from which each basal olivine-bearing layer crystallized, were approximately similar. Variations in the iron-magnesium ratio of ortho-pyroxenes indicate well defined continuous fractionation trends in units which are considered to be complete. Magnesian compositions are recorded in ultramfic members, while increasingly iron-enriched values are recorded upwards through the sequence pyroxenite-norite-antorthosite. Plagioclase grains exhibit less well defined fractionation trends, but it is clear that an upward increase in An is encountered through indivitual Units. This is in direct contrast to the trend exhibited by orthopyroxene. A further feature of plagioclase grains is the considerable degree of chemical zonation exhibited by them. In cumulus grains this is commonly manifested as strongly reversed rims, while in intercululus grains normal zoning is ubiquitous. Whole-rock chemical variations through the succession indicate that cyclical variations occur through successive Units, but that these merely reflect changes in modal mineralogy and not liquid fractionation trends. Such trends can be shown for selected element ratios, where these elements are known to partition into a single mineral phase. Rations of pyroxene components such as the nickel/scandium ratio, exhibit a saw tooth pattern through successive Units, while ratios of plagioclase components such as the strontium/alumina ratio have unique, fairly constant values for each individual Unit but different values for successive Units. The latter type of cyclicity is not always strictly confined to lithologically recognized boundaries between Units, and a slight overlap into overlying ultramafic layers is apparent. An investigation of variations in trace element levels in a single layer in five widely separated boreholes revealed that there is some evidence for a lateral fractionation trend from the southwest (more primitive) to the northeast (more evolved), although the small number of data points available preclude definite conclusions. There exists in the data some evidence that the Giant Mottled Anorthosite differs chemically from the other anorthosites in the study section, and that it more closely resembles rocks of the Main Zone. This evidence is particularly apparent in variations of the chromium/aluminium ratio of orthoyroxene grains, and in the An content of plagioclase grains, both of whose trends exhibit distinct inflections at the base of this member. The features of the succession at Amandelbult are best explained by the model of Eales et al. (in press, a), which visualizes the input of a number of pulses of new, hot liquid into a magma chamber containing the fractionated residua of previous influxes. At a critical point in time, just prior to the mafic Merensky Reef input, a large input of gabboic liquid was intruded at high levels in the chamber. The lower portions of this liquid mixed with the residua of earlier mafic inputs, which in turn mixed with new inputs of mafic, typical Critical Zone liquids. Thus the lower portions of the study section represent mixtures of new Critical Zone liquids with the residua of previous such influxes, while the upper portions have the added complication of mixture with a Main Zone-type liquid. The unique chemical character of the Giant Mottled Anorthosite appears to be a direct manifestation of the influence of the Main Zone liquid. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- 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
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
The structural elucidation of the capsular antigen of klebsiella serotype k69
- Authors: Hackland, Peter Linton
- Date: 1987
- Subjects: Antigens , Klebsiella
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3816 , http://hdl.handle.net/10962/d1004901 , Antigens , Klebsiella
- Full Text:
- Date Issued: 1987
- Authors: Hackland, Peter Linton
- Date: 1987
- Subjects: Antigens , Klebsiella
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3816 , http://hdl.handle.net/10962/d1004901 , Antigens , Klebsiella
- Full Text:
- Date Issued: 1987