Ngalanga 5th movement
- Venancio Mbande and his Timbila players, Tracey, Andrew T N
- Authors: Venancio Mbande and his Timbila players , Tracey, Andrew T N
- Date: 1992
- Subjects: Chopi (African people) -- Music , Folk music -- South Africa , Xylophone (Musical instrument) , Drum (Musical instruments) , Sub-Saharan African music , Africa South Africa Wildebeesfontein f-za
- Language: Chopi
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/98903 , vital:31641 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC076a-05
- Description: Traditional Ngalanga dance song for young people with 3 Timbila xylophone and 3 drums accompaniment
- Full Text: false
- Date Issued: 1992
- Authors: Venancio Mbande and his Timbila players , Tracey, Andrew T N
- Date: 1992
- Subjects: Chopi (African people) -- Music , Folk music -- South Africa , Xylophone (Musical instrument) , Drum (Musical instruments) , Sub-Saharan African music , Africa South Africa Wildebeesfontein f-za
- Language: Chopi
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/98903 , vital:31641 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC076a-05
- Description: Traditional Ngalanga dance song for young people with 3 Timbila xylophone and 3 drums accompaniment
- Full Text: false
- Date Issued: 1992
Nickel sulphide mineralization associated with Archean komatiites
- Authors: Lane, Monica Leonie
- Date: 1992
- Subjects: Nickel sulfide , Geology, Stratigraphic -- Archaean
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4982 , http://hdl.handle.net/10962/d1005594 , Nickel sulfide , Geology, Stratigraphic -- Archaean
- Description: The distribution of Archean Nickel sulphide deposits reflects tectonic controls operating during the evolution of the granitoid greenstone terrains. Important deposits of komatiitic-affinity are concentrated within, and adjacent to, younger (∼2.7 Ga), rift-related greenstone belts (e.g. Canada, Western Australia and Zimababwe). Two important classes of Archean Nickel sulphide deposits exist, formerly known as "Dunitic" and "Peridotitic", these are now referred to as Group I and Group II deposits, based on their characteristic structure and composition. Mineralization varies from massive and matrix to disseminated, and is nearly always concentrated at the base of the host unit. Primary ores have a relatively simple mineralogy, dominated by pyrrhotite-pentlandite-pyrite, and to a lesser degree millerite. Metamorphic grades tend to range from prehnite-pumpellyite facies through to lower and upper amphibolite facies. Genesis of Group I and II deposits is explained by the eruption of komatiites into rift-phase greenstone belts, as channelized flows, which assimilated variable amounts of footwall rocks during emplacement. Sulphide saturation was dependent on the mode of emplacement and, the amount of sulphidic sediments that became assimilated prior to crystallization. This possibly accounts for variations in ore tenor. The Six Mile Deposit (SMD) in Western Australia, is an adcumulate body of the Group IIB-type, exhibiting disseminated mineralization. The ore has been "upgraded" due to hydration and serpentinization. A profound weathering sequence exists, which was subsequently utilized during initial exploration. Exploration techniques has been focused on Western Australia, as it is here that the most innovative ideas have emerged.
- Full Text:
- Date Issued: 1992
- Authors: Lane, Monica Leonie
- Date: 1992
- Subjects: Nickel sulfide , Geology, Stratigraphic -- Archaean
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4982 , http://hdl.handle.net/10962/d1005594 , Nickel sulfide , Geology, Stratigraphic -- Archaean
- Description: The distribution of Archean Nickel sulphide deposits reflects tectonic controls operating during the evolution of the granitoid greenstone terrains. Important deposits of komatiitic-affinity are concentrated within, and adjacent to, younger (∼2.7 Ga), rift-related greenstone belts (e.g. Canada, Western Australia and Zimababwe). Two important classes of Archean Nickel sulphide deposits exist, formerly known as "Dunitic" and "Peridotitic", these are now referred to as Group I and Group II deposits, based on their characteristic structure and composition. Mineralization varies from massive and matrix to disseminated, and is nearly always concentrated at the base of the host unit. Primary ores have a relatively simple mineralogy, dominated by pyrrhotite-pentlandite-pyrite, and to a lesser degree millerite. Metamorphic grades tend to range from prehnite-pumpellyite facies through to lower and upper amphibolite facies. Genesis of Group I and II deposits is explained by the eruption of komatiites into rift-phase greenstone belts, as channelized flows, which assimilated variable amounts of footwall rocks during emplacement. Sulphide saturation was dependent on the mode of emplacement and, the amount of sulphidic sediments that became assimilated prior to crystallization. This possibly accounts for variations in ore tenor. The Six Mile Deposit (SMD) in Western Australia, is an adcumulate body of the Group IIB-type, exhibiting disseminated mineralization. The ore has been "upgraded" due to hydration and serpentinization. A profound weathering sequence exists, which was subsequently utilized during initial exploration. Exploration techniques has been focused on Western Australia, as it is here that the most innovative ideas have emerged.
- Full Text:
- Date Issued: 1992
Observing and describing textual "reality": a critique of the claims to objective reality and authentication in new critical and structuralist literary theory, seen against a background of Feyerabend's ideas concerning paradigms, dominance and ideology
- Authors: Masters, Kenneth Andrew
- Date: 1992
- Subjects: Feyerabend, Paul, 1924-1994 , Criticism , Structuralism (Literary analysis) , Science and the arts , Reality , Objectivity
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2247 , http://hdl.handle.net/10962/d1002290 , Feyerabend, Paul, 1924-1994 , Criticism , Structuralism (Literary analysis) , Science and the arts , Reality , Objectivity
- Description: This thesis sets out to examine the claims to objective reality and authentication in New critical and Structuralist literary theories, concentrating on their claims to "objectivity" and "scientific validity." It examines the nature of these claims in the light of the original ideas proposed by some of the major New critics and structuralists in the development of their respective "sciences" of literary theory. Taking direction from the nature of reality and objectivity shown by the theorists, the thesis then attempts an assessment of the validity of some of the original perceptions and presuppositions concerning scientific objectivity and reality. It proposes that inconsistencies within the literary theories resulted from the theorists' inability to grasp the complexity and fluctuating nature of the borrowed terminology and principles that they were using. It does so by taking a closer look at the development of some of the more influential physical theories and the philosophical ideas raised by these developments. It then uses Feyerabend's work on paradigms, dominance and ideology to attempt an assessment of the reasons for the literary theorists' perceptions and presuppositions regarding objectivity and reality. This amounts to accounting for the specific scientific models chosen as bases, and also to accounting for the desire for the "scientific approach" at all. Its conclusions give an indication of the extent to which these original errors contributed to the theories' necessary adaptations of perspective and eventual loss of influence, and emphasises the need for the total understanding of concepts in one field by researchers in other fields, especially if those concepts are to be used by the researchers with any degree of precision.
- Full Text:
- Date Issued: 1992
- Authors: Masters, Kenneth Andrew
- Date: 1992
- Subjects: Feyerabend, Paul, 1924-1994 , Criticism , Structuralism (Literary analysis) , Science and the arts , Reality , Objectivity
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2247 , http://hdl.handle.net/10962/d1002290 , Feyerabend, Paul, 1924-1994 , Criticism , Structuralism (Literary analysis) , Science and the arts , Reality , Objectivity
- Description: This thesis sets out to examine the claims to objective reality and authentication in New critical and Structuralist literary theories, concentrating on their claims to "objectivity" and "scientific validity." It examines the nature of these claims in the light of the original ideas proposed by some of the major New critics and structuralists in the development of their respective "sciences" of literary theory. Taking direction from the nature of reality and objectivity shown by the theorists, the thesis then attempts an assessment of the validity of some of the original perceptions and presuppositions concerning scientific objectivity and reality. It proposes that inconsistencies within the literary theories resulted from the theorists' inability to grasp the complexity and fluctuating nature of the borrowed terminology and principles that they were using. It does so by taking a closer look at the development of some of the more influential physical theories and the philosophical ideas raised by these developments. It then uses Feyerabend's work on paradigms, dominance and ideology to attempt an assessment of the reasons for the literary theorists' perceptions and presuppositions regarding objectivity and reality. This amounts to accounting for the specific scientific models chosen as bases, and also to accounting for the desire for the "scientific approach" at all. Its conclusions give an indication of the extent to which these original errors contributed to the theories' necessary adaptations of perspective and eventual loss of influence, and emphasises the need for the total understanding of concepts in one field by researchers in other fields, especially if those concepts are to be used by the researchers with any degree of precision.
- Full Text:
- Date Issued: 1992
Opaqueness to the light of understanding: an investigation into some of the difficulties experienced by a sample of Transkeian matriculants with the components of the concept of chemical equilibrium
- Authors: Mammen, Kuttickattu John
- Date: 1992
- Subjects: Chemical equilibrium Physical sciences -- Study and teaching (Secondary) -- South Africa -- Transkei Black people -- Education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1680 , http://hdl.handle.net/10962/d1003563
- Description: The purpose of the study was to collect and collate information pertaining to common misconceptions of components of the concept of chemical equilibrium amongst a sample of Transkeian matriculants. 'Equilibrium' is a fundamental concept in physics and chemistry and 'chemical equilibrium' is an important chemistry topic in both the higher grade and standard grade South African matriculation physical science syllabuses. In recent years, South African teachers have identified chemical equilibrium as the most difficult section of the matric physical science syllabus for both teachers and pupils. It has been shown that teachers themselves lack understanding of the basic concepts underlying chemical equilibrium. Constructivist learning theories arise out of research in cognitive psychology. These theories conceive of cognitive development as the assimilation and accommodation of new ideas into extant, dynamic cognitive structures. An inference from the theories is that a study of the preconceptions and/or misconceptions held by pupils before they are exposed to instruction would enable teachers to avoid generating or reinforcing misconceptions. Hence teachers could also take deliberate steps to eradicate those already existing. The sample consisted of 112 Transkeian matriculants from four government senior secondary schools in the Southern Transkei. All were taking physical science. The test consisted of a 40 item multiple choice battery. Each question had three distracters and the options were randomized to avoid patterns and hence guessing. Questions dealing with closely associated concepts were grouped in the paper but no indication of this was given in the paper. The questions are analyzed singly. A brief introduction and outline of the theory on which the group of questions was based is given in each case. The analysis makes use of the frequency of choice of all options, discrimination indices, although they were generally low and item difficulties. The intent in each analysis is to identify the possible misconception(s) underlying wrong answers. Finally conclusions based on the discussion are drawn and recommendations for teaching and further research made.
- Full Text:
- Date Issued: 1992
- Authors: Mammen, Kuttickattu John
- Date: 1992
- Subjects: Chemical equilibrium Physical sciences -- Study and teaching (Secondary) -- South Africa -- Transkei Black people -- Education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1680 , http://hdl.handle.net/10962/d1003563
- Description: The purpose of the study was to collect and collate information pertaining to common misconceptions of components of the concept of chemical equilibrium amongst a sample of Transkeian matriculants. 'Equilibrium' is a fundamental concept in physics and chemistry and 'chemical equilibrium' is an important chemistry topic in both the higher grade and standard grade South African matriculation physical science syllabuses. In recent years, South African teachers have identified chemical equilibrium as the most difficult section of the matric physical science syllabus for both teachers and pupils. It has been shown that teachers themselves lack understanding of the basic concepts underlying chemical equilibrium. Constructivist learning theories arise out of research in cognitive psychology. These theories conceive of cognitive development as the assimilation and accommodation of new ideas into extant, dynamic cognitive structures. An inference from the theories is that a study of the preconceptions and/or misconceptions held by pupils before they are exposed to instruction would enable teachers to avoid generating or reinforcing misconceptions. Hence teachers could also take deliberate steps to eradicate those already existing. The sample consisted of 112 Transkeian matriculants from four government senior secondary schools in the Southern Transkei. All were taking physical science. The test consisted of a 40 item multiple choice battery. Each question had three distracters and the options were randomized to avoid patterns and hence guessing. Questions dealing with closely associated concepts were grouped in the paper but no indication of this was given in the paper. The questions are analyzed singly. A brief introduction and outline of the theory on which the group of questions was based is given in each case. The analysis makes use of the frequency of choice of all options, discrimination indices, although they were generally low and item difficulties. The intent in each analysis is to identify the possible misconception(s) underlying wrong answers. Finally conclusions based on the discussion are drawn and recommendations for teaching and further research made.
- Full Text:
- Date Issued: 1992
Participatory research for community development: an annotated bibliography
- Authors: Van Vlaenderen, Hilda
- Date: 1992
- Subjects: Participant observation -- Bibliography Participant observation Community development -- Bibliography
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/1920 , vital:20239 , ISBN 0868102377
- Description: This Working Paper reports on the results conducted into the nature and extent of the embryonic venture capital industry in South Africa. It represents part of an on-going research programme dealing with Black economic development undertaken by the Development Studies Unit (DSU) at Rhodes University. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1992
- Authors: Van Vlaenderen, Hilda
- Date: 1992
- Subjects: Participant observation -- Bibliography Participant observation Community development -- Bibliography
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/1920 , vital:20239 , ISBN 0868102377
- Description: This Working Paper reports on the results conducted into the nature and extent of the embryonic venture capital industry in South Africa. It represents part of an on-going research programme dealing with Black economic development undertaken by the Development Studies Unit (DSU) at Rhodes University. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1992
Paul and Barnabas in Lystra (Acts 14:8-20): the contextualization of the Gospel in a Graeco-Roman city
- Authors: Germiquet, Edouard Ariste
- Date: 1992
- Subjects: Bible. Acts -- Criticism, interpretation, etc.
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1306 , http://hdl.handle.net/10962/d1018213
- Description: This thesis will investigate the extensive Graeco-Roman characteristics of the Lystra speech and in so doing convey some clarity in the otherwise widely differing opinions held about it. This will be achieved by showing that Lystra was a Hellenistic city of some importance with a varied population. It will be argued that the initial reaction of the Lystrians to the miraculous healing of the cripple is to be understood as representing typical Graeco-Roman notions. This will include Luke's use of a legend which not only adds local colouring to the narrative but also introduces Graeco-Roman themes such as the blurring of the distinction between humans and gods and the custom of sacrifice. This contextualization immediately portrays the Graeco-Roman nature of the Lystrians' behaviour and attitudes. In addition to these themes it will be argued that the Lystrians are shown to being reliant on secondary notions of God, which when exposed to the proclamation of the apostles will prove to be inadequate. It will also be argued that the speech of the apostles is structured in a typically Graeco-Roman rhetorical form, where the errors are first exposed before the truth is presented. In conjunction with this structure it will be argued that the philosophical concept of which Dibelius has shown to be clearly presupposed in the Areopagus speech, is not only present in the Lystra speech but forms the philosophical basis on which it is structured. This concept explains the insistence by the apostles that they are human and that God has no need of such worthless things as sacrifices. It also explains the presentation of God's activity in creation and providence as an antithesis to a god who is in need. The Graeco-Roman aspects are brought to a close with the discussion of idea that an awareness of God does not depend on secondary notions acquired from legends or customs but that the truth is grasped through a process of reflection on creation and providence. This is an important notion in the speech for it exposes the Lystrians as being in need of a reorientation of their beliefs in God, away from those which are secondary to those which are primary and compatible with the truth.
- Full Text:
- Date Issued: 1992
- Authors: Germiquet, Edouard Ariste
- Date: 1992
- Subjects: Bible. Acts -- Criticism, interpretation, etc.
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1306 , http://hdl.handle.net/10962/d1018213
- Description: This thesis will investigate the extensive Graeco-Roman characteristics of the Lystra speech and in so doing convey some clarity in the otherwise widely differing opinions held about it. This will be achieved by showing that Lystra was a Hellenistic city of some importance with a varied population. It will be argued that the initial reaction of the Lystrians to the miraculous healing of the cripple is to be understood as representing typical Graeco-Roman notions. This will include Luke's use of a legend which not only adds local colouring to the narrative but also introduces Graeco-Roman themes such as the blurring of the distinction between humans and gods and the custom of sacrifice. This contextualization immediately portrays the Graeco-Roman nature of the Lystrians' behaviour and attitudes. In addition to these themes it will be argued that the Lystrians are shown to being reliant on secondary notions of God, which when exposed to the proclamation of the apostles will prove to be inadequate. It will also be argued that the speech of the apostles is structured in a typically Graeco-Roman rhetorical form, where the errors are first exposed before the truth is presented. In conjunction with this structure it will be argued that the philosophical concept of which Dibelius has shown to be clearly presupposed in the Areopagus speech, is not only present in the Lystra speech but forms the philosophical basis on which it is structured. This concept explains the insistence by the apostles that they are human and that God has no need of such worthless things as sacrifices. It also explains the presentation of God's activity in creation and providence as an antithesis to a god who is in need. The Graeco-Roman aspects are brought to a close with the discussion of idea that an awareness of God does not depend on secondary notions acquired from legends or customs but that the truth is grasped through a process of reflection on creation and providence. This is an important notion in the speech for it exposes the Lystrians as being in need of a reorientation of their beliefs in God, away from those which are secondary to those which are primary and compatible with the truth.
- Full Text:
- Date Issued: 1992
Pegmatite-hosted mineral deposits of central and southern Africa : regional geological settings and preliminary exploration target considerations
- Senzani, Freeman Elther David
- Authors: Senzani, Freeman Elther David
- Date: 1992
- Subjects: Pegmatites -- Africa, Southern , Mineralogy -- Africa, Southern , Pegmatites -- Africa, Central , Mineralogy -- Africa, Central
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5011 , http://hdl.handle.net/10962/d1006087
- Description: Review of literature shows that rocks of all ages from the Archaean to the early Phanerozoic host pegmatite-based mineralisation in the central and southern region of the African continent. The greatest concentrations occur in the Archaean and late Proterozoic orogenic belts, while early to middle Proterozoic granites do not, in general, host mineralisation. Pan-African mineralisation is present, but is not widespread. Some deposits previously considered to be of Pan-African have been shown to be of Proterozoic age. In common with occurrences of other regions, the deposits are closely associated with small, late- to post-tectonic granites. Therefore, preliminary assessment of the potential of granites as sources of pegmatite mineralisation should utilise satellite data or aerial photographs. The granites also tend to be alkaline and peraluminous. Thus, in the next stage, chemical analysis for selected major and trace elements should be conducted directly on granites if they occur as small plutons. For large granitic batholiths or terranes, preliminary stream-sediment surveys may be necessary to reduce the size of the target area. Subsequently, pegmatite zonation around suitable granites should be assessed as it allows attention to be focussed on areas likely to host the specific type of mineralisation being explored for.
- Full Text:
- Date Issued: 1992
- Authors: Senzani, Freeman Elther David
- Date: 1992
- Subjects: Pegmatites -- Africa, Southern , Mineralogy -- Africa, Southern , Pegmatites -- Africa, Central , Mineralogy -- Africa, Central
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5011 , http://hdl.handle.net/10962/d1006087
- Description: Review of literature shows that rocks of all ages from the Archaean to the early Phanerozoic host pegmatite-based mineralisation in the central and southern region of the African continent. The greatest concentrations occur in the Archaean and late Proterozoic orogenic belts, while early to middle Proterozoic granites do not, in general, host mineralisation. Pan-African mineralisation is present, but is not widespread. Some deposits previously considered to be of Pan-African have been shown to be of Proterozoic age. In common with occurrences of other regions, the deposits are closely associated with small, late- to post-tectonic granites. Therefore, preliminary assessment of the potential of granites as sources of pegmatite mineralisation should utilise satellite data or aerial photographs. The granites also tend to be alkaline and peraluminous. Thus, in the next stage, chemical analysis for selected major and trace elements should be conducted directly on granites if they occur as small plutons. For large granitic batholiths or terranes, preliminary stream-sediment surveys may be necessary to reduce the size of the target area. Subsequently, pegmatite zonation around suitable granites should be assessed as it allows attention to be focussed on areas likely to host the specific type of mineralisation being explored for.
- Full Text:
- Date Issued: 1992
Petrogenesis of late Archaean flood-type basic lavas from the Klipriviersberg Group, Ventersdorp Supergroup, South Africa
- Marsh, Julian S, Bowen, M P, Rogers, N W, Bowen, T B
- Authors: Marsh, Julian S , Bowen, M P , Rogers, N W , Bowen, T B
- Date: 1992
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145829 , vital:38470 , https://doi.org/10.1093/petrology/33.4.817
- Description: The Klipriviersberg Group is a small continental flood-type tholeiitic suite forming the basal unit of the Ventersdorp Supergroup, an undeformed late-Archaean supracrustal sequence covering 200000 km2 in the SW part of the Kaapvaal Craton. From the base up, the Klipriviersberg Group consists of the Westonaria, Alberton, Orkney, Jeannette, Loraine, and Edenville formations, with a maximum combined thickness of 1–8 km. Samples were obtained from several borehole cores in the Klerksdorp goldfield close to the type area of the Klipriviersberg Group.
- Full Text: false
- Date Issued: 1992
- Authors: Marsh, Julian S , Bowen, M P , Rogers, N W , Bowen, T B
- Date: 1992
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145829 , vital:38470 , https://doi.org/10.1093/petrology/33.4.817
- Description: The Klipriviersberg Group is a small continental flood-type tholeiitic suite forming the basal unit of the Ventersdorp Supergroup, an undeformed late-Archaean supracrustal sequence covering 200000 km2 in the SW part of the Kaapvaal Craton. From the base up, the Klipriviersberg Group consists of the Westonaria, Alberton, Orkney, Jeannette, Loraine, and Edenville formations, with a maximum combined thickness of 1–8 km. Samples were obtained from several borehole cores in the Klerksdorp goldfield close to the type area of the Klipriviersberg Group.
- Full Text: false
- Date Issued: 1992
Petrogenesis of the upper critical zone in the Western Bushveld Complex with emphasis on the UG1 Footwall and Bastard units
- Authors: De Klerk, William Johan
- Date: 1992
- Subjects: Petrogenesis -- South Africa Formations (Geology) -- South Africa Mineralogy -- South Africa Geochemistry -- South Africa Petrology -- Africa, Southern Rustenburg Platinum Mines
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4986 , http://hdl.handle.net/10962/d1005598
- Description: This study is an account of the stratigraphic sequence, the petrography, mineralogy (microprobe investigations of orthopyroxene, clinopyroxene, olivine and plagioclase feldspar), and whole-rock major- and traceelement geochemistry of the silicate cumulates of the Upper Critical Zone in the western Bushveld Complex. Two parts of the study - an investigation of a 350m column incorporating the MG3 and UGI Footwall Units, and a comparison of two additional Upper Critical Zone profiles with a previously compiled profile between the UGI and Bastard Units - are focused on RPM Union Section in the northwestern sector of the Complex. The third part is a detailed vertical and lateral investigation of the Bastard Unit at the top of the Critical Zone, which draws on sampling and data compilation from seventeen profiles in the western limb of the Complex. The MG3 Unit (45m) is made up of a lower chromitite layer overlain by a norite-pyroxenite-anorthosite sequence while the UGlFW Unit (295m) is composed of a related series of lower chromitite layers (MG4) overlain by a pyroxenite-norite-anorthosite sequence capped by the UGI chromitite layer. These mafic cumulates display a distinctive pattern of oscillating cryptic variation in whole-rock Mg/(Mg+Fe), FeO/Ti0₂, Cr/Co and Ni/V ratios through the sequence. Sympathetic oscillations are recorded for compositions of orthopyroxene and plagioclase feldspar and eight subcycles are recognised through the UGlFW Unit. The entire sequence is characterised by the presence of small, spheroidal, embayed and irregularly shaped plagioclase grains which are poikilitically enclosed in cumulus orthopyroxene grains of both pyroxenites and norites. This texture is indicative of partial resorption of pre-existing feldspar primocrysts within the melt prior to their being incorporated into the host orthopyroxene grains. Textural, geochemical and isotopic data suggest that this sequence was built up by periodic additions of fresh, relatively primitive liquid into fractionated resident liquid, and subsequent mixing within the magma chamber. The Bastard Unit sequence, described in Chapter 4, is the last and most complete cyclic unit (c. 60m) of the Critical Zone, and its upper contact defines the boundary between the Critical and Main Zones of the Complex. This Unit can conveniently be sub-divided into a lower part, where orthopyroxene occurs as a cumulus phase, and the upper part which is composed entirely of anorthosite (Giant Mottled Anorthosite). The basal part of the Unit (≤ 18m) comprises a thin chromitite layer < O.5cm) overlain by a pyroxenite-melanorite-norite-leuconorite sequence. The basal pyroxenite is orthocumulate in character and rapidly gives way to norites and leuconorites. A distinct threefold subdivision emerges within the Giant Mottled Anorthosite which is predominantly an adcumulate which becomes orthocumulate in character at its top. Apart from minor deviations in thicknesses these lithologies are recorded over the entire strike-length covered in this study. Profiles of cryptic variation are compiled for orthopyroxene, plagioclase and whole-rock data and show that the Bastard Unit displays a characteristic pattern which is maintained throughout the western Bushveld Complex. A minor yet distinctive reversal in cryptic variation is revealed at a level which is stratigraphically variable within the lower Giant Mottled Anorthosite, and results in a double cuspate pattern. A remarkable feature of the basal Bastard pyroxenites is that although the modal proportion of mafic to felsic constituents varies systematically away from the northwestern sector, the Mg/(Mg+Fe) ratio of orthopyroxenes remains constant at 0.804 over a lateral strike distance of 171km. Within the upper part of the Unit the orthopyroxene is markedly Fe-rich and it is here that inverted primary pigeonite appears for the first time as a cumulus phase. In addition, K-feldspar, oscillatory zoned plagioclase grains and high levels of incompatible trace elements are noted at this level. On the basis of the data presented it is concluded that the Bastard Unit represents the crystallisation of a final, relatively large influx of hotter primitive liquid, with upper Critical Zone affinities, and subsequent mixing with a column of cooler (less dense) supernatant liquid which had in part hybridized with the overlying Main Zone magma. It is hypothesised that this new liquid was emplaced as a basal flow beneath supernatant liquid and that it initiated the deposition of mafic cumulates at its base. The supernatant liquid is interpreted as representing the fractionated residuum produced by crystallisation of earlier cyclic units, with plagioclase on the liquidus, and that it contained an abundance of small plagioclase primocrysts in suspension. Development of the Unit can be viewed as a two-stage process. In the lower half of the unit, chemical and physical parameters typical of the new magma dominated the crystallisation process, and resulted in cumulates very similar to other relatively complete Upper Critical Zone units. In the upper, leucocratic sequence, above a minor reversal, crystallisation was from a liquid which was the product of mixing of a minor pulse of primitive liquid with the reservoir of hybridized supernatant liquid. Although the Bastard Unit is not continuous around the entire Western limb of the Complex, it is concluded that it developed in a single, or connected, magma chamber and that its irruptive feeder zone was located in the proximal northwestern facies of the Complex.
- Full Text:
- Date Issued: 1992
- Authors: De Klerk, William Johan
- Date: 1992
- Subjects: Petrogenesis -- South Africa Formations (Geology) -- South Africa Mineralogy -- South Africa Geochemistry -- South Africa Petrology -- Africa, Southern Rustenburg Platinum Mines
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4986 , http://hdl.handle.net/10962/d1005598
- Description: This study is an account of the stratigraphic sequence, the petrography, mineralogy (microprobe investigations of orthopyroxene, clinopyroxene, olivine and plagioclase feldspar), and whole-rock major- and traceelement geochemistry of the silicate cumulates of the Upper Critical Zone in the western Bushveld Complex. Two parts of the study - an investigation of a 350m column incorporating the MG3 and UGI Footwall Units, and a comparison of two additional Upper Critical Zone profiles with a previously compiled profile between the UGI and Bastard Units - are focused on RPM Union Section in the northwestern sector of the Complex. The third part is a detailed vertical and lateral investigation of the Bastard Unit at the top of the Critical Zone, which draws on sampling and data compilation from seventeen profiles in the western limb of the Complex. The MG3 Unit (45m) is made up of a lower chromitite layer overlain by a norite-pyroxenite-anorthosite sequence while the UGlFW Unit (295m) is composed of a related series of lower chromitite layers (MG4) overlain by a pyroxenite-norite-anorthosite sequence capped by the UGI chromitite layer. These mafic cumulates display a distinctive pattern of oscillating cryptic variation in whole-rock Mg/(Mg+Fe), FeO/Ti0₂, Cr/Co and Ni/V ratios through the sequence. Sympathetic oscillations are recorded for compositions of orthopyroxene and plagioclase feldspar and eight subcycles are recognised through the UGlFW Unit. The entire sequence is characterised by the presence of small, spheroidal, embayed and irregularly shaped plagioclase grains which are poikilitically enclosed in cumulus orthopyroxene grains of both pyroxenites and norites. This texture is indicative of partial resorption of pre-existing feldspar primocrysts within the melt prior to their being incorporated into the host orthopyroxene grains. Textural, geochemical and isotopic data suggest that this sequence was built up by periodic additions of fresh, relatively primitive liquid into fractionated resident liquid, and subsequent mixing within the magma chamber. The Bastard Unit sequence, described in Chapter 4, is the last and most complete cyclic unit (c. 60m) of the Critical Zone, and its upper contact defines the boundary between the Critical and Main Zones of the Complex. This Unit can conveniently be sub-divided into a lower part, where orthopyroxene occurs as a cumulus phase, and the upper part which is composed entirely of anorthosite (Giant Mottled Anorthosite). The basal part of the Unit (≤ 18m) comprises a thin chromitite layer < O.5cm) overlain by a pyroxenite-melanorite-norite-leuconorite sequence. The basal pyroxenite is orthocumulate in character and rapidly gives way to norites and leuconorites. A distinct threefold subdivision emerges within the Giant Mottled Anorthosite which is predominantly an adcumulate which becomes orthocumulate in character at its top. Apart from minor deviations in thicknesses these lithologies are recorded over the entire strike-length covered in this study. Profiles of cryptic variation are compiled for orthopyroxene, plagioclase and whole-rock data and show that the Bastard Unit displays a characteristic pattern which is maintained throughout the western Bushveld Complex. A minor yet distinctive reversal in cryptic variation is revealed at a level which is stratigraphically variable within the lower Giant Mottled Anorthosite, and results in a double cuspate pattern. A remarkable feature of the basal Bastard pyroxenites is that although the modal proportion of mafic to felsic constituents varies systematically away from the northwestern sector, the Mg/(Mg+Fe) ratio of orthopyroxenes remains constant at 0.804 over a lateral strike distance of 171km. Within the upper part of the Unit the orthopyroxene is markedly Fe-rich and it is here that inverted primary pigeonite appears for the first time as a cumulus phase. In addition, K-feldspar, oscillatory zoned plagioclase grains and high levels of incompatible trace elements are noted at this level. On the basis of the data presented it is concluded that the Bastard Unit represents the crystallisation of a final, relatively large influx of hotter primitive liquid, with upper Critical Zone affinities, and subsequent mixing with a column of cooler (less dense) supernatant liquid which had in part hybridized with the overlying Main Zone magma. It is hypothesised that this new liquid was emplaced as a basal flow beneath supernatant liquid and that it initiated the deposition of mafic cumulates at its base. The supernatant liquid is interpreted as representing the fractionated residuum produced by crystallisation of earlier cyclic units, with plagioclase on the liquidus, and that it contained an abundance of small plagioclase primocrysts in suspension. Development of the Unit can be viewed as a two-stage process. In the lower half of the unit, chemical and physical parameters typical of the new magma dominated the crystallisation process, and resulted in cumulates very similar to other relatively complete Upper Critical Zone units. In the upper, leucocratic sequence, above a minor reversal, crystallisation was from a liquid which was the product of mixing of a minor pulse of primitive liquid with the reservoir of hybridized supernatant liquid. Although the Bastard Unit is not continuous around the entire Western limb of the Complex, it is concluded that it developed in a single, or connected, magma chamber and that its irruptive feeder zone was located in the proximal northwestern facies of the Complex.
- Full Text:
- Date Issued: 1992
Phase equilibria in three component systems alcohol-hydrocarbon-water
- Authors: Siswana, Msimelelo Patrick
- Date: 1992
- Subjects: Chemical equilibrium , Liquid-liquid equilibrium , Alcohol as fuel , Hydrocarbons , Water chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4327 , http://hdl.handle.net/10962/d1004988 , Chemical equilibrium , Liquid-liquid equilibrium , Alcohol as fuel , Hydrocarbons , Water chemistry
- Description: The fuel industry in many parts of the world is blending alcohols with motor fuel either to extend the fuel or to improve its octane rating or both. Unfortunately alcohols are hygroscopic and as a result, water becomes a component of the fuel. This can lead to phase separation and the formation of a water-rich layer which could have serious corrosion consequences. In an attempt to understand the phase-splitting in alcohol-petrol-water blends, phase equilibria in ternary systems (alcohol-hydrocarbon-water) have been determined by experiment. The phase equilibria in these ternary systems are also discussed in terms of modern theories of liquid mixtures and the UNIQUAC theory is applied to the "ethanol + benzene + water" ternary system. The alcohols are all the C₁, C₂, C₃ and C₄ alcohols, and the hydrocarbons include those typically found in petrol, e.g. cyclohexane, benzene and substituted benzenes.
- Full Text:
- Date Issued: 1992
- Authors: Siswana, Msimelelo Patrick
- Date: 1992
- Subjects: Chemical equilibrium , Liquid-liquid equilibrium , Alcohol as fuel , Hydrocarbons , Water chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4327 , http://hdl.handle.net/10962/d1004988 , Chemical equilibrium , Liquid-liquid equilibrium , Alcohol as fuel , Hydrocarbons , Water chemistry
- Description: The fuel industry in many parts of the world is blending alcohols with motor fuel either to extend the fuel or to improve its octane rating or both. Unfortunately alcohols are hygroscopic and as a result, water becomes a component of the fuel. This can lead to phase separation and the formation of a water-rich layer which could have serious corrosion consequences. In an attempt to understand the phase-splitting in alcohol-petrol-water blends, phase equilibria in ternary systems (alcohol-hydrocarbon-water) have been determined by experiment. The phase equilibria in these ternary systems are also discussed in terms of modern theories of liquid mixtures and the UNIQUAC theory is applied to the "ethanol + benzene + water" ternary system. The alcohols are all the C₁, C₂, C₃ and C₄ alcohols, and the hydrocarbons include those typically found in petrol, e.g. cyclohexane, benzene and substituted benzenes.
- Full Text:
- Date Issued: 1992
Phenology of the important coleopterous pests of pine forests in the Western Cape, South Africa
- Authors: Tribe, Geoffrey Darryl
- Date: 1992
- Subjects: Beetles -- South Africa Bark beetles -- South Africa -- Cape of Good Hope Scolytidae Phenology -- South Africa Phenology -- South Africa -- Cape of Good Hope
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5737 , http://hdl.handle.net/10962/d1005423
- Description: The phenology of the three exotic pine bark beetles present in South Africa was determined in the south-western Cape Province. Results from weekly trapping of adult beetles using trap-logs over a period of five years showed that the different species had activity peaks at different times of the year. Hylastes angustatus was the most consistent with 95% of the beetles captured in September and October. The Orthotomicus erosus activity peak was more variable but always occurred in the summer months (October to February) when 84% of the beetles were captured. Hylurgus ligniperda was the most variable, being found in every month of the year, although an autumn peak representing 37% of the beetles occurred in April/May. Activity peaks of each species coincided with distinct climatic conditions. Buried and partially-buried pine logs placed vertically in the soil to simulate roots and stems of seedlings were used to determine the colonisation sites of the three bark beetle species. Ninety-eight percent of O. erosus beetles were found in the protruding parts of the logs while 86% of H. ligniperda beetles were found mainly below soil level. H. angustatus were intermediate, entering the logs at or just below the soil interface but colonising mainly the buried parts in which 64% of the beetles were found. Both H. angustatus and H. ligniperda were able to detect and colonise logs buried horizontally at depths of 400mm, but O. erosus beetles were unable to do so. For adequate protection of seedlings from bark beetles, insecticide should be applied to both stems and roots. The phenology of the indigenous pine needle feeders Oosomus varius (Curculionidae) and Prasoidea sericea (Chrysomelidae) was determined by counting, at weekly intervals, the number of beetles present on 10 young pine trees. The O. varius activity peak occurred in August where 42% of all beetles were active, with 87% of the beetles present in July, August and September. P. sericea also had their activity peak in August when 60% of all beetles were active, but with August and September alone accounting for 87% of the beetles. The occurrence of the activity peaks was consistent each year over the five-year study period. This information facilitates the correct timing of prophylactic insecticide sprays.
- Full Text:
- Date Issued: 1992
- Authors: Tribe, Geoffrey Darryl
- Date: 1992
- Subjects: Beetles -- South Africa Bark beetles -- South Africa -- Cape of Good Hope Scolytidae Phenology -- South Africa Phenology -- South Africa -- Cape of Good Hope
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5737 , http://hdl.handle.net/10962/d1005423
- Description: The phenology of the three exotic pine bark beetles present in South Africa was determined in the south-western Cape Province. Results from weekly trapping of adult beetles using trap-logs over a period of five years showed that the different species had activity peaks at different times of the year. Hylastes angustatus was the most consistent with 95% of the beetles captured in September and October. The Orthotomicus erosus activity peak was more variable but always occurred in the summer months (October to February) when 84% of the beetles were captured. Hylurgus ligniperda was the most variable, being found in every month of the year, although an autumn peak representing 37% of the beetles occurred in April/May. Activity peaks of each species coincided with distinct climatic conditions. Buried and partially-buried pine logs placed vertically in the soil to simulate roots and stems of seedlings were used to determine the colonisation sites of the three bark beetle species. Ninety-eight percent of O. erosus beetles were found in the protruding parts of the logs while 86% of H. ligniperda beetles were found mainly below soil level. H. angustatus were intermediate, entering the logs at or just below the soil interface but colonising mainly the buried parts in which 64% of the beetles were found. Both H. angustatus and H. ligniperda were able to detect and colonise logs buried horizontally at depths of 400mm, but O. erosus beetles were unable to do so. For adequate protection of seedlings from bark beetles, insecticide should be applied to both stems and roots. The phenology of the indigenous pine needle feeders Oosomus varius (Curculionidae) and Prasoidea sericea (Chrysomelidae) was determined by counting, at weekly intervals, the number of beetles present on 10 young pine trees. The O. varius activity peak occurred in August where 42% of all beetles were active, with 87% of the beetles present in July, August and September. P. sericea also had their activity peak in August when 60% of all beetles were active, but with August and September alone accounting for 87% of the beetles. The occurrence of the activity peaks was consistent each year over the five-year study period. This information facilitates the correct timing of prophylactic insecticide sprays.
- Full Text:
- Date Issued: 1992
Photosynthetic gas exchange responses to light, temperature, carbon dioxide and water stress, and changes in photosynthetic pigments to light and water stress in two cultivars of Hordeum vulgare L
- Logie, Malcolme Ronald Ruxton
- Authors: Logie, Malcolme Ronald Ruxton
- Date: 1992
- Subjects: Plants -- Photorespiration , Plants -- Transpiration , Botanical chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4210 , http://hdl.handle.net/10962/d1003779
- Description: The gas exchange responses of two cultivars of Hordeum vulgare L., to light, temperature, CO₂ and water stress were investigated in the laboratory. The optimum temperature for net CO₂ assimilation was found to be 25°C and 22.5°C for cv. Clipper and cv. Dayan respectively. Net CO₂ assimilation was reduced at 30°C in cv. Dayan. At low light intensity the highest quantum yield efficiency was 0.051 mol.mol⁻¹ at 30°C for cv. Clipper, and 0.066 mol.mol⁻¹ at 20°C for cv. Dayan. At the same temperature, cv. Clipper had a higher water use efficiency than cv. Dayan, but stomatal conductance for cv. Dayan was higher than cv. Clipper. Stomatal limitation to CO₂ was lowest at the optimum temperature for CO₂ assimilation in both cultivars. Stomata limited CO₂ assimilation in cv. Clipper to a larger degree than in cv. Dayan. Relative stomatal limitation for cv. Clipper at 25°C was 0.280 ± 0.010, and for cv. Dayan at 22.5°C was 0.028 ± 0.011. Short-term exposure to elevated CO₂ concentrations increased CO₂ assimilation in both cultivars, but more so for cv. Clipper. Transpiration rate at elevated CO₂ partial pressures were higher in cv. Dayan than in cv. Clipper. At very high CO₂ (860 μmol.m⁻²s⁻¹) partial pressure water use efficiency in cv. Clipper was higher than cv. Dayan, but at low CO₂ partial pressures water use efficiency in cv. Dayan was higher than cv. Clipper. Water stress reduced the relative leaf water content and net CO₂ assimilation in both cultivars. Cultivar Dayan was more tolerant to water stress, and CO₂ assimilation in this cultivar was less affected by water stress. In both cultivars water stress increased the concentration of chlorophyll a, chlorophyll b, and chlorophyll a+b. The chlorophyll a:b ratio remained relatively constant throughout the stress period. No correlation between relative leaf water content and total carotenoid concentration was observed.
- Full Text:
- Date Issued: 1992
- Authors: Logie, Malcolme Ronald Ruxton
- Date: 1992
- Subjects: Plants -- Photorespiration , Plants -- Transpiration , Botanical chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4210 , http://hdl.handle.net/10962/d1003779
- Description: The gas exchange responses of two cultivars of Hordeum vulgare L., to light, temperature, CO₂ and water stress were investigated in the laboratory. The optimum temperature for net CO₂ assimilation was found to be 25°C and 22.5°C for cv. Clipper and cv. Dayan respectively. Net CO₂ assimilation was reduced at 30°C in cv. Dayan. At low light intensity the highest quantum yield efficiency was 0.051 mol.mol⁻¹ at 30°C for cv. Clipper, and 0.066 mol.mol⁻¹ at 20°C for cv. Dayan. At the same temperature, cv. Clipper had a higher water use efficiency than cv. Dayan, but stomatal conductance for cv. Dayan was higher than cv. Clipper. Stomatal limitation to CO₂ was lowest at the optimum temperature for CO₂ assimilation in both cultivars. Stomata limited CO₂ assimilation in cv. Clipper to a larger degree than in cv. Dayan. Relative stomatal limitation for cv. Clipper at 25°C was 0.280 ± 0.010, and for cv. Dayan at 22.5°C was 0.028 ± 0.011. Short-term exposure to elevated CO₂ concentrations increased CO₂ assimilation in both cultivars, but more so for cv. Clipper. Transpiration rate at elevated CO₂ partial pressures were higher in cv. Dayan than in cv. Clipper. At very high CO₂ (860 μmol.m⁻²s⁻¹) partial pressure water use efficiency in cv. Clipper was higher than cv. Dayan, but at low CO₂ partial pressures water use efficiency in cv. Dayan was higher than cv. Clipper. Water stress reduced the relative leaf water content and net CO₂ assimilation in both cultivars. Cultivar Dayan was more tolerant to water stress, and CO₂ assimilation in this cultivar was less affected by water stress. In both cultivars water stress increased the concentration of chlorophyll a, chlorophyll b, and chlorophyll a+b. The chlorophyll a:b ratio remained relatively constant throughout the stress period. No correlation between relative leaf water content and total carotenoid concentration was observed.
- Full Text:
- Date Issued: 1992
Polymorphism and fighting in male fig wasps
- Authors: Vincent, Stephanie Louise
- Date: 1992
- Subjects: Fig wasp Chalcid wasps -- Morphology Wasps
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5740 , http://hdl.handle.net/10962/d1005426
- Description: Male fig wasps (Hymenoptera: Chalcidoidea) exhibit a fascinating range of morphology and behaviour. A cluster analysis, based on descriptions of the males of several hundred species, distinguished six major morphological groups. Behaviourial observations suggest that male morphology is related to the levels of inter-male aggression. Three behaviourial groupings were identified. Fighting species generally mated in the fig cavity, pacifist species mated in the females' galls or outside the figs. Mating sites are thus the primary determinants of male morphology and behaviour. In fighting species males were larger than their females, whereas pacifists and aggressors were equal in size or smaller than conspecific females. The large males in fighting fig wasps appear to be a consequence of sexual selection because larger males tended to win fights. Within a species there were no differences in the size of the galls that produced males and females, even in species where sexual size differences were present, suggesting that there is a heritable component to wasp size. No alternative advantages for smaller males were detected. Although fights were sometimes fatal, damage was not always a consequence of fighting behaviour and was recorded in both fighting and pacifist species. Sex ratios in several species were more female biased at higher population densities. Sex ratios of species with 'internally' ovipositing species were heavily female biased, but approached 1:1 in more outbred species with 'externally' ovipositing females. Levels of matedness, among females ranged from 73% to 99%. No evidence for sperm exhaustion was obtained. Species of Philotrypesis with both winged and flightless males were present only in southern African Ficus species from subsections Platyphyllae and Chlamydodorae. No species had only winged males. The flightless males of some Philotrypesis species were themselves polymorphic. In one polymorphic Philotrypesis species, winged males were found to be rare at high densities, but common at low densities. Digitata and religiosa males of Otitesella differed in coloration, size and behaviour. Digitata males were aggressors while religiosa males were fighters. Digitata males escaped from the figs whereas religiosa males remained inside the figs, perhaps because only digitata males were attracted to Light. Proportionally more digitata than religiosa males were present in low density populations and females were found to respond differently to the two morphs.
- Full Text:
- Date Issued: 1992
- Authors: Vincent, Stephanie Louise
- Date: 1992
- Subjects: Fig wasp Chalcid wasps -- Morphology Wasps
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5740 , http://hdl.handle.net/10962/d1005426
- Description: Male fig wasps (Hymenoptera: Chalcidoidea) exhibit a fascinating range of morphology and behaviour. A cluster analysis, based on descriptions of the males of several hundred species, distinguished six major morphological groups. Behaviourial observations suggest that male morphology is related to the levels of inter-male aggression. Three behaviourial groupings were identified. Fighting species generally mated in the fig cavity, pacifist species mated in the females' galls or outside the figs. Mating sites are thus the primary determinants of male morphology and behaviour. In fighting species males were larger than their females, whereas pacifists and aggressors were equal in size or smaller than conspecific females. The large males in fighting fig wasps appear to be a consequence of sexual selection because larger males tended to win fights. Within a species there were no differences in the size of the galls that produced males and females, even in species where sexual size differences were present, suggesting that there is a heritable component to wasp size. No alternative advantages for smaller males were detected. Although fights were sometimes fatal, damage was not always a consequence of fighting behaviour and was recorded in both fighting and pacifist species. Sex ratios in several species were more female biased at higher population densities. Sex ratios of species with 'internally' ovipositing species were heavily female biased, but approached 1:1 in more outbred species with 'externally' ovipositing females. Levels of matedness, among females ranged from 73% to 99%. No evidence for sperm exhaustion was obtained. Species of Philotrypesis with both winged and flightless males were present only in southern African Ficus species from subsections Platyphyllae and Chlamydodorae. No species had only winged males. The flightless males of some Philotrypesis species were themselves polymorphic. In one polymorphic Philotrypesis species, winged males were found to be rare at high densities, but common at low densities. Digitata and religiosa males of Otitesella differed in coloration, size and behaviour. Digitata males were aggressors while religiosa males were fighters. Digitata males escaped from the figs whereas religiosa males remained inside the figs, perhaps because only digitata males were attracted to Light. Proportionally more digitata than religiosa males were present in low density populations and females were found to respond differently to the two morphs.
- Full Text:
- Date Issued: 1992
Power play and the changing face of English
- Authors: De Klerk, Vivian A
- Date: 1992
- Language: English
- Type: Conference paper
- Identifier: vital:6126 , http://hdl.handle.net/10962/d1011599
- Full Text:
- Date Issued: 1992
- Authors: De Klerk, Vivian A
- Date: 1992
- Language: English
- Type: Conference paper
- Identifier: vital:6126 , http://hdl.handle.net/10962/d1011599
- Full Text:
- Date Issued: 1992
Power play and the changing face of English : inaugural lecture delivered at Rhodes University
- Authors: De Klerk, Vivian A
- Date: 1992
- Subjects: Sociolinguistics , Linguistic change , Language and languages -- Political aspects
- Language: English
- Type: Text
- Identifier: vital:616 , http://hdl.handle.net/10962/d1020685 , ISBN 0868102334
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1992
- Authors: De Klerk, Vivian A
- Date: 1992
- Subjects: Sociolinguistics , Linguistic change , Language and languages -- Political aspects
- Language: English
- Type: Text
- Identifier: vital:616 , http://hdl.handle.net/10962/d1020685 , ISBN 0868102334
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1992
Project water (Grahamstown) : a case study of the development of an environmental education project
- Authors: Ashwell, Alice Nicola
- Date: 1992
- Subjects: Environmental education -- Study and teaching (Secondary) -- South Africa Environmental education -- Activity programs -- South Africa Water quality -- Measurement Water conservation -- South Africa Water-supply -- South Africa -- Grahamstown Global Rivers Environmental Education Network Project Water (Grahamstown) Water -- Pollution -- Environmental aspects Water -- Pollution -- South Africa -- Grahamstown Schools -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1716 , http://hdl.handle.net/10962/d1003599
- Description: Environmental education is an approach to education which emphasises the interrelatedness of people and their human and non-human environments and seeks to encourage environmental awareness, concern and action. This case study documents the implementation and development of Project WATER, Grahamstown, a practical environmental education project dealing with catchment conservation and water quality monitoring. The Grahamstown project is one of a number of local water quality monitoring initiatives affiliated to GREEN (the Global Rivers Environmental Education Network). Participants in the project included student teachers from the Department of Education at Rhodes University and pupils and teachers from three farm schools in the district and four high schools in the town. Project WATER, Grahamstown developed as an Action Research and Community Problem-Solving project. The study focuses on fragmentalist and holistic approaches to education, people's responses to Project WATER and the choice of action research as the research method.
- Full Text:
- Date Issued: 1992
- Authors: Ashwell, Alice Nicola
- Date: 1992
- Subjects: Environmental education -- Study and teaching (Secondary) -- South Africa Environmental education -- Activity programs -- South Africa Water quality -- Measurement Water conservation -- South Africa Water-supply -- South Africa -- Grahamstown Global Rivers Environmental Education Network Project Water (Grahamstown) Water -- Pollution -- Environmental aspects Water -- Pollution -- South Africa -- Grahamstown Schools -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1716 , http://hdl.handle.net/10962/d1003599
- Description: Environmental education is an approach to education which emphasises the interrelatedness of people and their human and non-human environments and seeks to encourage environmental awareness, concern and action. This case study documents the implementation and development of Project WATER, Grahamstown, a practical environmental education project dealing with catchment conservation and water quality monitoring. The Grahamstown project is one of a number of local water quality monitoring initiatives affiliated to GREEN (the Global Rivers Environmental Education Network). Participants in the project included student teachers from the Department of Education at Rhodes University and pupils and teachers from three farm schools in the district and four high schools in the town. Project WATER, Grahamstown developed as an Action Research and Community Problem-Solving project. The study focuses on fragmentalist and holistic approaches to education, people's responses to Project WATER and the choice of action research as the research method.
- Full Text:
- Date Issued: 1992
Public relations in community work : a public relations programme for direct service organisations
- Carmichael-Kathan, Averil Margaret
- Authors: Carmichael-Kathan, Averil Margaret
- Date: 1992 , 2012-11-28
- Subjects: Social service -- Public relations -- Research , Community organization -- Research , Social service -- Research
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:692 , http://hdl.handle.net/10962/d1006375 , Social service -- Public relations -- Research , Community organization -- Research , Social service -- Research
- Description: The community work method of social work is a method requiring creativity, application of specialised skills and knowledge, sound planning and administration and a persuasiveness to reach the various sectors of the community in order to accomplish broad based goals. Public relations is an occupation that has a sound body of literature and theory, a code of ethics or conduct, a host of tools and methods and also requires sound planning and administration, bound together with persuasiveness to reach the various publics in order to accomplish goals affecting image, quality of service rendering and marketing of services. The present study was concerned with identifying the commonalities and the differences between the profession of community work and the occupation of public relations in order to enhance the content of community work theory for practical application by community workers. The differences between the two would, in fact, teach content to community work. It was hypothesised that public relations has a necessary function and is an occupation that can be internalised with and applied to community work for the effective marketing of organisational services. A model for incorporating public relations into community work was designed and implemented in a direct service welfare organisation with positive results. This design is applicable to other direct service welfare organisations with innovative and flexible management teams. The results of an empirical research study, making use of random sampling and questionnaires, was analysed. The results indicated that public relations and community work were comparable entities with reference to knowledge bases, values, skills, tools, methods, techniques, ethics and programmes. A third group of respondents emerged in this study - community workers practising public relations firmly within the realm of community work. This group advocated the use of marketing and communication strategies in applying the community work method effectively. The primary difference to emerge from the work research was one of emphasis in applying methods and subsequently, community work can learn a great deal from these differences which will enhance service rendering correspondingly. The culmination of this study led to several highly relevant conclusions and recommendations for welfare organisations in a Post-apartheid South Africa. The most worthwhile conclusion was that community work has a great deal to learn from public relations, and that they are combinable entities at every level. , KMBT_223
- Full Text:
- Date Issued: 1992
- Authors: Carmichael-Kathan, Averil Margaret
- Date: 1992 , 2012-11-28
- Subjects: Social service -- Public relations -- Research , Community organization -- Research , Social service -- Research
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:692 , http://hdl.handle.net/10962/d1006375 , Social service -- Public relations -- Research , Community organization -- Research , Social service -- Research
- Description: The community work method of social work is a method requiring creativity, application of specialised skills and knowledge, sound planning and administration and a persuasiveness to reach the various sectors of the community in order to accomplish broad based goals. Public relations is an occupation that has a sound body of literature and theory, a code of ethics or conduct, a host of tools and methods and also requires sound planning and administration, bound together with persuasiveness to reach the various publics in order to accomplish goals affecting image, quality of service rendering and marketing of services. The present study was concerned with identifying the commonalities and the differences between the profession of community work and the occupation of public relations in order to enhance the content of community work theory for practical application by community workers. The differences between the two would, in fact, teach content to community work. It was hypothesised that public relations has a necessary function and is an occupation that can be internalised with and applied to community work for the effective marketing of organisational services. A model for incorporating public relations into community work was designed and implemented in a direct service welfare organisation with positive results. This design is applicable to other direct service welfare organisations with innovative and flexible management teams. The results of an empirical research study, making use of random sampling and questionnaires, was analysed. The results indicated that public relations and community work were comparable entities with reference to knowledge bases, values, skills, tools, methods, techniques, ethics and programmes. A third group of respondents emerged in this study - community workers practising public relations firmly within the realm of community work. This group advocated the use of marketing and communication strategies in applying the community work method effectively. The primary difference to emerge from the work research was one of emphasis in applying methods and subsequently, community work can learn a great deal from these differences which will enhance service rendering correspondingly. The culmination of this study led to several highly relevant conclusions and recommendations for welfare organisations in a Post-apartheid South Africa. The most worthwhile conclusion was that community work has a great deal to learn from public relations, and that they are combinable entities at every level. , KMBT_223
- Full Text:
- Date Issued: 1992
Pushing out towards the limits, and finding the centre: the mystical vision in the work of Ursula K. Le Guin
- Authors: Hoyle, Gisela Beate
- Date: 1992
- Subjects: Le Guin, Ursula K., 1929- Criticism and interpretation , Mysticism in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2243 , http://hdl.handle.net/10962/d1002286 , Le Guin, Ursula K., 1929- Criticism and interpretation , Mysticism in literature
- Description: This thesis explores the major novels of science fiction and fantasy writer, Ursula K. Le Guin: it follows her journey from her first imaginary country, Orsinia, through the inner lands of Earthsea and the outer spaces of the Hainish Ekumen to her Yin utopia in a future California and an Earthsea revisited. In each of these worlds she moves towards an experience of an inner, unified truth which is comparable to the ecstatic experience of the religious mystics and that of which T.S Eliot writes in his Four Quartets. Through her reading of the Taoist sages and the discovery of their perception of Life as a constant and ongoing process rather than as a series of isolated events or states, whether mystical or mundane, these worlds and planets become symbols of a way of life instead of static objects. In her medium, narrative, this way is embodied in the story: the movement towards that moment of enlightenment, which is revealed as the heart, the life-giving centre of each world. It is the home to which each journey returns. "True voyage is return' (The Dispossessed). Owing to this perception of the immanent (w)holiness of life, of the many, different realities, she moves from a serene Taoist equilibrium to an angry feminist rejection of the masculine, dualist, Western civilisation, in which Man has largely been perceived as a creature apart; apart from nature, a guest on this planet, belonging to another world. In her anarchist and feminist utopias she seeks a new spititual home, a less alienated identity for humankind. Despite this apparent "development", at the heart of aU her books there is that same joy in this, mortal life, the search for which she sees as the most essential of aU human pursuits. That, ultimately, is both source and subject of Le Guin's work; and each new world explored is a different manifestation of the joyful Tao, a celebration of life.
- Full Text:
- Date Issued: 1992
- Authors: Hoyle, Gisela Beate
- Date: 1992
- Subjects: Le Guin, Ursula K., 1929- Criticism and interpretation , Mysticism in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2243 , http://hdl.handle.net/10962/d1002286 , Le Guin, Ursula K., 1929- Criticism and interpretation , Mysticism in literature
- Description: This thesis explores the major novels of science fiction and fantasy writer, Ursula K. Le Guin: it follows her journey from her first imaginary country, Orsinia, through the inner lands of Earthsea and the outer spaces of the Hainish Ekumen to her Yin utopia in a future California and an Earthsea revisited. In each of these worlds she moves towards an experience of an inner, unified truth which is comparable to the ecstatic experience of the religious mystics and that of which T.S Eliot writes in his Four Quartets. Through her reading of the Taoist sages and the discovery of their perception of Life as a constant and ongoing process rather than as a series of isolated events or states, whether mystical or mundane, these worlds and planets become symbols of a way of life instead of static objects. In her medium, narrative, this way is embodied in the story: the movement towards that moment of enlightenment, which is revealed as the heart, the life-giving centre of each world. It is the home to which each journey returns. "True voyage is return' (The Dispossessed). Owing to this perception of the immanent (w)holiness of life, of the many, different realities, she moves from a serene Taoist equilibrium to an angry feminist rejection of the masculine, dualist, Western civilisation, in which Man has largely been perceived as a creature apart; apart from nature, a guest on this planet, belonging to another world. In her anarchist and feminist utopias she seeks a new spititual home, a less alienated identity for humankind. Despite this apparent "development", at the heart of aU her books there is that same joy in this, mortal life, the search for which she sees as the most essential of aU human pursuits. That, ultimately, is both source and subject of Le Guin's work; and each new world explored is a different manifestation of the joyful Tao, a celebration of life.
- Full Text:
- Date Issued: 1992
Reconstruction of South African sport: from sports activism to post-apartheid policy planning and implementation
- Authors: Roberts, Cheryl
- Date: 1992
- Subjects: Sports and state -- South Africa , Discrimination in sports -- South Africa , Sports -- South Africa -- Planning
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/73426 , vital:30190 , 0620163321
- Description: The six papers which appear in this publication were delivered at a consultative conference of the National and Olympic Sports Congress which was held in Johannesburg from 1-3 November 1991. There is no doubt that this conference on development could not have been held at a more critical juncture in South Africa's history, particularly at a time when the country stands on the threshold of an era which is expected to usher in a non-racial, democratic society. Given the legacy of apartheid, development and preparation have become priorities for the National and Olympic Sports Congress. It was against the background of the inequalities and future projections for transformation of the sports network which brought delegates together from across South Africa and from all codes of sport and co-ordinating regional councils. A central theme of the papers is that the reconstruction of South African sport demands a national programme, one that would ensure progress towards an equitable sports structure but also one that would set realistic goals without raising expectations that are unlikely to be realised. A central challenge of the conference was the search for a suitable combination of high performance sport and mass participation. The gender question in sport also came under the spotlight. Sport's male-dominated, hierarchical and sexist structure was mandated for urgent review. Conference was told that black women have very few opportunities to participate in sport unlike white sportswomen and sports people overall. Five resolutions, aimed at transforming the present state of South African sport, were adopted at the conference. After exhaustive discussions delegates identified the broad themes to be: national development and planning, national sports policy, building one sports federation, sponsorship, rural areas, affirmative action and empowerment. Conference noted the absence of a co-ordinated national sports policy, the heavy commercialisation of sport together with the lack of vision and planning for the future of sport. In this regard it was resolved to intiate the acceptance and development of a national sports policy which would emphasise development, national identity and patriotism, democracy, accountability, non-racialism and non-sexism. If the conference deliberations are to be seriously implemented then the apartheid sports network will undergo structural changes which will develop the historically disadvantaged and unleash the suppressed talents of millions of people who are trapped in an unequal and resourceless system.
- Full Text:
- Date Issued: 1992
- Authors: Roberts, Cheryl
- Date: 1992
- Subjects: Sports and state -- South Africa , Discrimination in sports -- South Africa , Sports -- South Africa -- Planning
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/73426 , vital:30190 , 0620163321
- Description: The six papers which appear in this publication were delivered at a consultative conference of the National and Olympic Sports Congress which was held in Johannesburg from 1-3 November 1991. There is no doubt that this conference on development could not have been held at a more critical juncture in South Africa's history, particularly at a time when the country stands on the threshold of an era which is expected to usher in a non-racial, democratic society. Given the legacy of apartheid, development and preparation have become priorities for the National and Olympic Sports Congress. It was against the background of the inequalities and future projections for transformation of the sports network which brought delegates together from across South Africa and from all codes of sport and co-ordinating regional councils. A central theme of the papers is that the reconstruction of South African sport demands a national programme, one that would ensure progress towards an equitable sports structure but also one that would set realistic goals without raising expectations that are unlikely to be realised. A central challenge of the conference was the search for a suitable combination of high performance sport and mass participation. The gender question in sport also came under the spotlight. Sport's male-dominated, hierarchical and sexist structure was mandated for urgent review. Conference was told that black women have very few opportunities to participate in sport unlike white sportswomen and sports people overall. Five resolutions, aimed at transforming the present state of South African sport, were adopted at the conference. After exhaustive discussions delegates identified the broad themes to be: national development and planning, national sports policy, building one sports federation, sponsorship, rural areas, affirmative action and empowerment. Conference noted the absence of a co-ordinated national sports policy, the heavy commercialisation of sport together with the lack of vision and planning for the future of sport. In this regard it was resolved to intiate the acceptance and development of a national sports policy which would emphasise development, national identity and patriotism, democracy, accountability, non-racialism and non-sexism. If the conference deliberations are to be seriously implemented then the apartheid sports network will undergo structural changes which will develop the historically disadvantaged and unleash the suppressed talents of millions of people who are trapped in an unequal and resourceless system.
- Full Text:
- Date Issued: 1992
Recruitment of juvenile marine fishes into permanently open and seasonally open estuarine systems on the southern coast of South Africa
- Authors: Whitfield, Alan K , Kok, H M
- Date: 1992
- Subjects: Marine fishes -- Migration -- South Africa , Estuarine fisheries
- Language: English
- Type: Text
- Identifier: vital:15020 , http://hdl.handle.net/10962/d1019801 , ISBN 0-86810-232-6 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 57
- Description: The recruitment of juvenile marine fishes into the Knysna and Swartvlei estuaries was monitored over 30 months using seine, scoop and cast nets. The relative abundance, seasonality and growth of the dominant species are presented, and includes the Cape stumpnose Rhabdosargus holubi, white steenbras Lithognathus lithognathus, blacktail Diplodus sargus, strepie Sarpa salpa, Cape moony Monodactylus falciformis, southern mullet Liza richardsonii, groovy mullet Liza dumerilii, striped mullet Liza tricuspidens, flathead mullet Mugil cephalus, freshwater mullet Myxus capensis and leervis Lichia amia. Information on a further 12 species is also provided. Recruitment of most fish species into the Swartvlei and Knysna estuaries reaches a peak during summer, which coincides with maximum food resource availability and corresponds to the time when systems along this section of the coast are often open to the sea. Artificial winter breaching of the Swartvlei mouth has occurred in the past, and has generally led to the premature closure of the system and loss of the ‘head’ of water needed for the summer opening. This type of mouth manipulation leads to reduced availability of estuarine nursery areas for marine fishes along the southern Cape coast. Comparisons between the recruitment of juvenile fishes into the Knysna and Swartvlei estuaries indicate that higher densities of most species were recorded in the former system. This is attributed mainly to the fact that the Knysna mouth is deep, permanently open, and has a strong marine influence when compared to the shallow, narrow and seasonally closed Swartvlei mouth. However, in a regional context both Knysna and Swartvlei are large, unpolluted systems, which serve as important nursery areas for many species of fish. On this basis alone, these contrasting estuarine systems should be allocated the highest possible conservation status. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1992
- Authors: Whitfield, Alan K , Kok, H M
- Date: 1992
- Subjects: Marine fishes -- Migration -- South Africa , Estuarine fisheries
- Language: English
- Type: Text
- Identifier: vital:15020 , http://hdl.handle.net/10962/d1019801 , ISBN 0-86810-232-6 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 57
- Description: The recruitment of juvenile marine fishes into the Knysna and Swartvlei estuaries was monitored over 30 months using seine, scoop and cast nets. The relative abundance, seasonality and growth of the dominant species are presented, and includes the Cape stumpnose Rhabdosargus holubi, white steenbras Lithognathus lithognathus, blacktail Diplodus sargus, strepie Sarpa salpa, Cape moony Monodactylus falciformis, southern mullet Liza richardsonii, groovy mullet Liza dumerilii, striped mullet Liza tricuspidens, flathead mullet Mugil cephalus, freshwater mullet Myxus capensis and leervis Lichia amia. Information on a further 12 species is also provided. Recruitment of most fish species into the Swartvlei and Knysna estuaries reaches a peak during summer, which coincides with maximum food resource availability and corresponds to the time when systems along this section of the coast are often open to the sea. Artificial winter breaching of the Swartvlei mouth has occurred in the past, and has generally led to the premature closure of the system and loss of the ‘head’ of water needed for the summer opening. This type of mouth manipulation leads to reduced availability of estuarine nursery areas for marine fishes along the southern Cape coast. Comparisons between the recruitment of juvenile fishes into the Knysna and Swartvlei estuaries indicate that higher densities of most species were recorded in the former system. This is attributed mainly to the fact that the Knysna mouth is deep, permanently open, and has a strong marine influence when compared to the shallow, narrow and seasonally closed Swartvlei mouth. However, in a regional context both Knysna and Swartvlei are large, unpolluted systems, which serve as important nursery areas for many species of fish. On this basis alone, these contrasting estuarine systems should be allocated the highest possible conservation status. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1992