Codeswitching, borrowing and mixing in a corpus of Xhosa English
- Authors: De Klerk, Vivian A
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6130 , http://hdl.handle.net/10962/d1011582
- Description: The paper analyses selected aspects of the codeswitching behaviour in a spoken corpus of the English of 326 people, all of them mother-tongue speakers of Xhosa (a local African language in South Africa), and all of whom would see themselves as Xhosa/English bilinguals. The corpus comprises approximately 550,000 transcribed words of spontaneous, relaxed, oral discourse in English between pairs of Xhosaspeaking interlocutors, discussing a wide range of topics. While the usual pattern in bilingual speech is to use the L1 as matrix language and the L2 as embedded language, in this corpus the opposite is the case, as interlocutors were interviewed in English (the L2). The corpus therefore offers a ‘mirror image’, in a sense, of normal codeswitching behaviour. Using Wordsmith (a concordancer programme), all incidences of codeswitching into Xhosa during these conversations were identified and analysed in an effort to reveal underlying patterns. Examination of the amount and nature of codeswitching in the corpus promised to throw some light on the extent to which participants are genuinely bilingual, in terms of their ability to converse comfortably in English.
- Full Text:
- Date Issued: 2006
- Authors: De Klerk, Vivian A
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6130 , http://hdl.handle.net/10962/d1011582
- Description: The paper analyses selected aspects of the codeswitching behaviour in a spoken corpus of the English of 326 people, all of them mother-tongue speakers of Xhosa (a local African language in South Africa), and all of whom would see themselves as Xhosa/English bilinguals. The corpus comprises approximately 550,000 transcribed words of spontaneous, relaxed, oral discourse in English between pairs of Xhosaspeaking interlocutors, discussing a wide range of topics. While the usual pattern in bilingual speech is to use the L1 as matrix language and the L2 as embedded language, in this corpus the opposite is the case, as interlocutors were interviewed in English (the L2). The corpus therefore offers a ‘mirror image’, in a sense, of normal codeswitching behaviour. Using Wordsmith (a concordancer programme), all incidences of codeswitching into Xhosa during these conversations were identified and analysed in an effort to reveal underlying patterns. Examination of the amount and nature of codeswitching in the corpus promised to throw some light on the extent to which participants are genuinely bilingual, in terms of their ability to converse comfortably in English.
- Full Text:
- Date Issued: 2006
Cognitive therapy and the restructuring of early memories through guided imagery
- Authors: Edwards, D J A
- Date: 1990
- Language: English
- Type: Article
- Identifier: vital:6241 , http://hdl.handle.net/10962/d1007853
- Description: This article describes the application of a guided imagery psychodrama technique to emotionally charged early memories. Such memories provide access to core schemata about the self and social relationships. Two case studies illustrate how the imagery technique enables the therapist to identify and restructure key cognitions out of which the schemata are constructed. The need for techniques to modify developmentally primitive schemata is discussed. Examples are given of ways to assist the patient in confronting the strong affect that may be aroused and in dealing with cognitions that block the process. Effectiveness is discussed in terms of the contribution of a guided imagery session to the overall process of ''learning to learn'' that takes place in cognitive psychotherapy.
- Full Text: false
- Date Issued: 1990
- Authors: Edwards, D J A
- Date: 1990
- Language: English
- Type: Article
- Identifier: vital:6241 , http://hdl.handle.net/10962/d1007853
- Description: This article describes the application of a guided imagery psychodrama technique to emotionally charged early memories. Such memories provide access to core schemata about the self and social relationships. Two case studies illustrate how the imagery technique enables the therapist to identify and restructure key cognitions out of which the schemata are constructed. The need for techniques to modify developmentally primitive schemata is discussed. Examples are given of ways to assist the patient in confronting the strong affect that may be aroused and in dealing with cognitions that block the process. Effectiveness is discussed in terms of the contribution of a guided imagery session to the overall process of ''learning to learn'' that takes place in cognitive psychotherapy.
- Full Text: false
- Date Issued: 1990
Confronting the Colonial Library: teaching Political Studies amidst calls for a decolonised curriculum
- Authors: Matthews, Sally
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142191 , vital:38057 , DOI: 10.1080/02589346.2018.1418204
- Description: This paper engages with Mudimbe's concept of the ‘colonial library’ with the aim of using this engagement to contribute to current debates about decolonising South African university curricula. The term ‘colonial library’ refers to the body of texts and epistemological order which construct Africa as a symbol of otherness and inferiority. Mudimbe shows that even the most determined attempts to resist the colonial library draw on this same epistemological order. This presents a profound challenge for attempts to decolonise university curricula as it suggests that the colonial library's reach extends into attempts to dismantle it. In response to this challenge, I discuss ways in which we can oppose epistemological ethnocentrism and argue that we need to be open to the possibility of the emancipatory reappropriation of aspects of the colonial library. The paper concludes by relating the foregoing discussion to the South African political studies classroom.
- Full Text:
- Date Issued: 2018
- Authors: Matthews, Sally
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142191 , vital:38057 , DOI: 10.1080/02589346.2018.1418204
- Description: This paper engages with Mudimbe's concept of the ‘colonial library’ with the aim of using this engagement to contribute to current debates about decolonising South African university curricula. The term ‘colonial library’ refers to the body of texts and epistemological order which construct Africa as a symbol of otherness and inferiority. Mudimbe shows that even the most determined attempts to resist the colonial library draw on this same epistemological order. This presents a profound challenge for attempts to decolonise university curricula as it suggests that the colonial library's reach extends into attempts to dismantle it. In response to this challenge, I discuss ways in which we can oppose epistemological ethnocentrism and argue that we need to be open to the possibility of the emancipatory reappropriation of aspects of the colonial library. The paper concludes by relating the foregoing discussion to the South African political studies classroom.
- Full Text:
- Date Issued: 2018
Consistencies far beyond chance: an analysis of learner preconceptions of reflective symmetry
- Mhlolo, Michael K, Schäfer, Marc
- Authors: Mhlolo, Michael K , Schäfer, Marc
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141139 , vital:37947 , DOI: 10.15700/saje.v33n2a686
- Description: This article reports on regularities observed in learners’ preconceptions of reflective symmetry. Literature suggests that the very existence of such regularities indicates a gap between what learners know and what they need to know. Such a gap inhibits further understanding and application, and hence needed to be investigated. A total of 235 Grade 11 learners, from 13 high schools that participate in the First Rand Foundation-funded Mathematics Education project in the Eastern Cape, responded to a task on reflective symmetry. Our framework for analysing the responses was based on the taxonomy of structure of the observed learning outcome. The results indicated that 85% of learner responses reflect a motion understanding of reflections, where learners considered geometric figures as physical motions on top of the plane. While this understanding is useful in some cases, it is not an essential aspect of mapping understanding, which is critical for application in function notations and other analytical geometry contexts. We suggest that if this gap is to be closed, learners need to construct these reflections physically so that they may think of reflections beyond motion.
- Full Text:
- Date Issued: 2013
- Authors: Mhlolo, Michael K , Schäfer, Marc
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141139 , vital:37947 , DOI: 10.15700/saje.v33n2a686
- Description: This article reports on regularities observed in learners’ preconceptions of reflective symmetry. Literature suggests that the very existence of such regularities indicates a gap between what learners know and what they need to know. Such a gap inhibits further understanding and application, and hence needed to be investigated. A total of 235 Grade 11 learners, from 13 high schools that participate in the First Rand Foundation-funded Mathematics Education project in the Eastern Cape, responded to a task on reflective symmetry. Our framework for analysing the responses was based on the taxonomy of structure of the observed learning outcome. The results indicated that 85% of learner responses reflect a motion understanding of reflections, where learners considered geometric figures as physical motions on top of the plane. While this understanding is useful in some cases, it is not an essential aspect of mapping understanding, which is critical for application in function notations and other analytical geometry contexts. We suggest that if this gap is to be closed, learners need to construct these reflections physically so that they may think of reflections beyond motion.
- Full Text:
- Date Issued: 2013
Cosmological efficacy and the politics of Sacred Place: Soli Rainmaking in contemporary Zambia
- Authors: Simbao, Ruth K
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147482 , vital:38642 , https://doi.org/10.1162/AFAR_a_00163
- Description: In this article I analyze cosmological efficacy in light of the politicization and apparent secularization of contemporary annual ceremonies in Zambia, south-central Africa, which are framed by scholars as neotraditional (Lentz 2001), folklorized (van Binsbergen 1994), or retraditionalized (Gould 2005:3, 6) events. My term “festivalization” registers the formalization of Zambian performances such as rituals, harvest festivals, inaugurations, and initiations as annual festival events, but does not imply a pejorative attitude towards cultural change and so-called inauthenticity, as the words “folklorization” or “retraditionalization” seem to do.
- Full Text:
- Date Issued: 2014
- Authors: Simbao, Ruth K
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147482 , vital:38642 , https://doi.org/10.1162/AFAR_a_00163
- Description: In this article I analyze cosmological efficacy in light of the politicization and apparent secularization of contemporary annual ceremonies in Zambia, south-central Africa, which are framed by scholars as neotraditional (Lentz 2001), folklorized (van Binsbergen 1994), or retraditionalized (Gould 2005:3, 6) events. My term “festivalization” registers the formalization of Zambian performances such as rituals, harvest festivals, inaugurations, and initiations as annual festival events, but does not imply a pejorative attitude towards cultural change and so-called inauthenticity, as the words “folklorization” or “retraditionalization” seem to do.
- Full Text:
- Date Issued: 2014
Could a regulated market approach for rhinoceros horns work in South Africa? Some practical issues and concerns
- Collins, Alan, Fraser, Gavin C G, Snowball, Jeanette D
- Authors: Collins, Alan , Fraser, Gavin C G , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68600 , vital:29292 , http://www.essa2013.org.za/fullpaper/essa2013_2708.pdf
- Description: Publisher version , One of the proposals for fighting rhinoceros poaching is to legalise the trade in rhino horn and adopt a regulated market approach (RMA), which would require a vote at the 2016 CITES meeting in order to overturn the ban on the trade in rhino horn. The legal trade in rhino horn would enable the auctioning of stockpiles of horn and encourage captive breeding programmes. The aim of increasing the supply of horn is to reduce incentives to poach by driving down the price. This paper uses a conceptual/theoretical approach to consider the practical implications of the adoption of an RMA, drawing on demand, supply and production theory. The intention is explicitly to set out some practical concerns and issues that seem to have been underplayed or neglected in most published economic discourse on the subject. To secure a stockpile for some species needs biological success in captive breeding programs (CBPs) but this varies across species and habitats. Rhinoceros herds in a CBP would need relatively spatially extensive terrain and costly permanent security measures, and only appear feasible for the less aggressive “white” rhino. Thus, market price would actually need to be sustained at a high level to cover the start-up and security costs of such a programme that are unlikely to fall significantly. This is a double-edged sword in that the persistent high price of rhino horn provides an incentive for continued poaching activities. Supplementary policy measures that differentiate among consumer groups may also prove necessary.
- Full Text:
- Date Issued: 2013
- Authors: Collins, Alan , Fraser, Gavin C G , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68600 , vital:29292 , http://www.essa2013.org.za/fullpaper/essa2013_2708.pdf
- Description: Publisher version , One of the proposals for fighting rhinoceros poaching is to legalise the trade in rhino horn and adopt a regulated market approach (RMA), which would require a vote at the 2016 CITES meeting in order to overturn the ban on the trade in rhino horn. The legal trade in rhino horn would enable the auctioning of stockpiles of horn and encourage captive breeding programmes. The aim of increasing the supply of horn is to reduce incentives to poach by driving down the price. This paper uses a conceptual/theoretical approach to consider the practical implications of the adoption of an RMA, drawing on demand, supply and production theory. The intention is explicitly to set out some practical concerns and issues that seem to have been underplayed or neglected in most published economic discourse on the subject. To secure a stockpile for some species needs biological success in captive breeding programs (CBPs) but this varies across species and habitats. Rhinoceros herds in a CBP would need relatively spatially extensive terrain and costly permanent security measures, and only appear feasible for the less aggressive “white” rhino. Thus, market price would actually need to be sustained at a high level to cover the start-up and security costs of such a programme that are unlikely to fall significantly. This is a double-edged sword in that the persistent high price of rhino horn provides an incentive for continued poaching activities. Supplementary policy measures that differentiate among consumer groups may also prove necessary.
- Full Text:
- Date Issued: 2013
Culture, language and productivity in the workplace within the BRICS Nations:
- Kaschula, Russell H, Mostert, Andre, Wolff, H Ekkehard
- Authors: Kaschula, Russell H , Mostert, Andre , Wolff, H Ekkehard
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/174624 , vital:42495 , https://journals.co.za/doi/pdf/10.25159/2663-6697/5009
- Description: The changing economic environment globally carries challenges and opportunities for business. Cross-cultural environments and financial integration call for greater understanding of the workplace. The authors assess the usage and status of language and culture in workplaces within the BRICS (Brazil, Russia, India, China, South Africa) countries through a light touch survey to assist in framing further and deeper research activities. The objective is to develop a suitable research framework regarding the place of language and culture in the workplace in multilingual and multicultural contexts. The authors argue for the inclusion of a cultural dimension linked to multilingual strategies in the workplace. The inextricable link between language and culture is explored in this article.
- Full Text:
- Date Issued: 2019
- Authors: Kaschula, Russell H , Mostert, Andre , Wolff, H Ekkehard
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/174624 , vital:42495 , https://journals.co.za/doi/pdf/10.25159/2663-6697/5009
- Description: The changing economic environment globally carries challenges and opportunities for business. Cross-cultural environments and financial integration call for greater understanding of the workplace. The authors assess the usage and status of language and culture in workplaces within the BRICS (Brazil, Russia, India, China, South Africa) countries through a light touch survey to assist in framing further and deeper research activities. The objective is to develop a suitable research framework regarding the place of language and culture in the workplace in multilingual and multicultural contexts. The authors argue for the inclusion of a cultural dimension linked to multilingual strategies in the workplace. The inextricable link between language and culture is explored in this article.
- Full Text:
- Date Issued: 2019
Determinants of Job Satisfaction Among Academics at A Selected Institution of Higher Learning in The Eastern Cape Province of South Africa
- Mefi, Nteboheng Patricia, Asoba, Samson Nambei
- Authors: Mefi, Nteboheng Patricia , Asoba, Samson Nambei
- Date: 2021
- Subjects: Education (Higher) Education (Higher) Computer File , Job Satisfaction Job Satisfaction Computer File
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/7443 , vital:53976 , https://www.abacademies.org/articles/determinants-of-job-satisfaction-among-academics-at-a-selected-institution-of-higher-learning-in-the-eastern-cape-province-of-sout-13195.html
- Description: Many studies have considered job satisfaction and its antecedents in the profit making sector. These studies have provided a number of factors that influence job satisfaction including autonomy, compensation, growth opportunities, leadership styles, task variety and so on. There are numerous factors that have been discovered to positively influence job satisfaction. Interest in job satisfaction arises from the fact that productivity and other favourable organisational outcomes such as service delivery and quality of outputs have been found to associate with job satisfaction. This study followed a quantitative approach based on a Likert questionnaire to collect data on the antecedents of employee job satisfaction within a Higher Education Institution (HEI) in South Africa. It was established that antecedents of job satisfaction in the HEI resembled closely those established in the literature. It is recommended that HEI should consider factors such as remuneration, task variety, work autonomy, good workplace relations and leadership styles to foster employee motivation. Keywords: Job Satisfaction, Higher Education Institutions, Human Capital, Productivity
- Full Text:
- Date Issued: 2021
- Authors: Mefi, Nteboheng Patricia , Asoba, Samson Nambei
- Date: 2021
- Subjects: Education (Higher) Education (Higher) Computer File , Job Satisfaction Job Satisfaction Computer File
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/11260/7443 , vital:53976 , https://www.abacademies.org/articles/determinants-of-job-satisfaction-among-academics-at-a-selected-institution-of-higher-learning-in-the-eastern-cape-province-of-sout-13195.html
- Description: Many studies have considered job satisfaction and its antecedents in the profit making sector. These studies have provided a number of factors that influence job satisfaction including autonomy, compensation, growth opportunities, leadership styles, task variety and so on. There are numerous factors that have been discovered to positively influence job satisfaction. Interest in job satisfaction arises from the fact that productivity and other favourable organisational outcomes such as service delivery and quality of outputs have been found to associate with job satisfaction. This study followed a quantitative approach based on a Likert questionnaire to collect data on the antecedents of employee job satisfaction within a Higher Education Institution (HEI) in South Africa. It was established that antecedents of job satisfaction in the HEI resembled closely those established in the literature. It is recommended that HEI should consider factors such as remuneration, task variety, work autonomy, good workplace relations and leadership styles to foster employee motivation. Keywords: Job Satisfaction, Higher Education Institutions, Human Capital, Productivity
- Full Text:
- Date Issued: 2021
Determinants of life satisfaction among race groups in South Africa
- Ebrahim, Amina, Botha, Ferdi, Snowball, Jeanette D
- Authors: Ebrahim, Amina , Botha, Ferdi , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69311 , vital:29497 , https://doi.org/10.1080/0376835x.2013.797227
- Description: Economic indicators, like gross domestic product per capita, are commonly used as indicators of welfare. However, they have a very limited and narrow scope, excluding many potentially important welfare determinants, such as health, relative income and religion – not surprising since they were not designed to fill this role. As a result, there is growing acceptance, and use of, subjective measures of well-being (called ‘happiness’ or ‘life satisfaction’, often used interchangeably) both worldwide and in South Africa. Happiness economics does not propose to replace income-based measures of well-being, but rather attempts to complement them with broader measures, which can be important in making policy decisions that optimise societal welfare. This paper tests for differences in subjective well-being between race groups in South Africa, and investigates the determinants of self-rated life satisfaction for each group. Using the 2008 National Income Dynamics Study data, descriptive methods (analysis of variance) and an ordered probit model are applied. Results indicate that reported life satisfaction differs substantially among race groups, with black South Africans being the least satisfied group despite changes since the advent of democracy in 1994. Higher levels of educational attainment increased satisfaction for the whole sample, and women (particularly black women) are generally less satisfied than men. As found in many other studies, unemployed people have lower levels of life satisfaction than the employed, even when controlling for income and relative income. The determinants of life satisfaction are also different for each race group: white South Africans attach greater importance to physical health, whereas employment status and absolute income matter greatly for black people. For coloured people and black people, positional status (as measured by relative income) is an important determinant of well-being, with religious involvement contributing significantly to the well-being of Indian people.
- Full Text: false
- Date Issued: 2013
- Authors: Ebrahim, Amina , Botha, Ferdi , Snowball, Jeanette D
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69311 , vital:29497 , https://doi.org/10.1080/0376835x.2013.797227
- Description: Economic indicators, like gross domestic product per capita, are commonly used as indicators of welfare. However, they have a very limited and narrow scope, excluding many potentially important welfare determinants, such as health, relative income and religion – not surprising since they were not designed to fill this role. As a result, there is growing acceptance, and use of, subjective measures of well-being (called ‘happiness’ or ‘life satisfaction’, often used interchangeably) both worldwide and in South Africa. Happiness economics does not propose to replace income-based measures of well-being, but rather attempts to complement them with broader measures, which can be important in making policy decisions that optimise societal welfare. This paper tests for differences in subjective well-being between race groups in South Africa, and investigates the determinants of self-rated life satisfaction for each group. Using the 2008 National Income Dynamics Study data, descriptive methods (analysis of variance) and an ordered probit model are applied. Results indicate that reported life satisfaction differs substantially among race groups, with black South Africans being the least satisfied group despite changes since the advent of democracy in 1994. Higher levels of educational attainment increased satisfaction for the whole sample, and women (particularly black women) are generally less satisfied than men. As found in many other studies, unemployed people have lower levels of life satisfaction than the employed, even when controlling for income and relative income. The determinants of life satisfaction are also different for each race group: white South Africans attach greater importance to physical health, whereas employment status and absolute income matter greatly for black people. For coloured people and black people, positional status (as measured by relative income) is an important determinant of well-being, with religious involvement contributing significantly to the well-being of Indian people.
- Full Text: false
- Date Issued: 2013
Discussion document on economic policy
- Department of Economic Policy
- Authors: Department of Economic Policy
- Date: 1990-09-20-23
- Subjects: South Africa -- Economic policy , South Africa -- Economic conditions , Apartheid -- Economic aspects -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/66691 , vital:28982
- Description: This document has been prepared for debate within the ranks of the ANC. It does not represent an agreed policy, but rather seeks to contribute to a democratic process of formulating our movement's economic policy. The movement believes that economic policy should address itself to the demands and needs of the majority of the people, and active discussion and debate is essential if they are to have a more prominent place. The ANC has long recognised the necessity for political liberation and constitutional changes to be accompanied by socioeconomic transformation. The Freedom Charter proclaimed the necessity for the people to share in the countries wealth, for the land to be distributed to those who work it, for there to housing, security and comfort for all, and for the doors of learning and culture to opened. The constitutional guidelines also recognised the need for economic restructuring to be part of the process of constitutional change. , "This document has been prepared for debate within the ranks of the ANC". -- Introduction , "DEP workshop, Harare, 20-23 September 1990."
- Full Text:
- Date Issued: 1990-09-20-23
- Authors: Department of Economic Policy
- Date: 1990-09-20-23
- Subjects: South Africa -- Economic policy , South Africa -- Economic conditions , Apartheid -- Economic aspects -- South Africa
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/66691 , vital:28982
- Description: This document has been prepared for debate within the ranks of the ANC. It does not represent an agreed policy, but rather seeks to contribute to a democratic process of formulating our movement's economic policy. The movement believes that economic policy should address itself to the demands and needs of the majority of the people, and active discussion and debate is essential if they are to have a more prominent place. The ANC has long recognised the necessity for political liberation and constitutional changes to be accompanied by socioeconomic transformation. The Freedom Charter proclaimed the necessity for the people to share in the countries wealth, for the land to be distributed to those who work it, for there to housing, security and comfort for all, and for the doors of learning and culture to opened. The constitutional guidelines also recognised the need for economic restructuring to be part of the process of constitutional change. , "This document has been prepared for debate within the ranks of the ANC". -- Introduction , "DEP workshop, Harare, 20-23 September 1990."
- Full Text:
- Date Issued: 1990-09-20-23
Distinct kimberlite pipe classes with contrasting eruption processes
- Skinner, E M W, Marsh, Julian S
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2004
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/150603 , vital:38988 , https://doi.org/10.1016/j.lithos.2004.03.044
- Description: Field and Scott Smith [Field, M., Scott Smith, B.H., 1999. Contrasting geology and near-surface emplacement of kimberlite pipes in southern Africa and Canada. Proc. 7th Int. Kimb. Conf. (Eds. Gurney et al.) 1, 214–237.] propose that kimberlite pipes can be grouped into three types or classes. Classical or Class 1 pipes are the only class with characteristic low temperature, diatreme-facies kimberlite in addition to hypabyssal- and crater-facies kimberlite. Class 2 and 3 pipes are characterized only by hypabyssal-and crater-facies kimberlite.
- Full Text: false
- Date Issued: 2004
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2004
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/150603 , vital:38988 , https://doi.org/10.1016/j.lithos.2004.03.044
- Description: Field and Scott Smith [Field, M., Scott Smith, B.H., 1999. Contrasting geology and near-surface emplacement of kimberlite pipes in southern Africa and Canada. Proc. 7th Int. Kimb. Conf. (Eds. Gurney et al.) 1, 214–237.] propose that kimberlite pipes can be grouped into three types or classes. Classical or Class 1 pipes are the only class with characteristic low temperature, diatreme-facies kimberlite in addition to hypabyssal- and crater-facies kimberlite. Class 2 and 3 pipes are characterized only by hypabyssal-and crater-facies kimberlite.
- Full Text: false
- Date Issued: 2004
Effect of the killing method on post-mortem change in length of larvae of Thanatophilus micans (Fabricius, 1794) (Coleoptera: Silphidae) stored in 70% ethanol
- Midgley, John M, Villet, Martin H
- Authors: Midgley, John M , Villet, Martin H
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6857 , http://hdl.handle.net/10962/d1011140
- Description: It is recommended that insect larvae collected for forensic purposes should be killed using the same method as was used to create existing models for rate of development. Certain killing methods have been shown to be preferable because they cause less distortion of the specimens, but these are not always practicable in a particular case, and so a method of correcting for effect of killing method is required. Larvae of all instars of Thanatophilus micans (Fabricius 1794) (Coleoptera: Silphidae) were measured and then killed by immersion in ethanol, immersion in hot water or freezing. Samples were re-measured immediately after death, then stored in excess 70% ethanol and re-measured after 1 week and again after 4 weeks. The change in length was significantly different from zero in all samples (t = -9.07022, p < 0.001). An analysis of covariance showed that instar, killing method and storage time all had a significant effect on the change in length. The results showed that T. micans larvae have a great potential for change in length during storage but that the change is not predictable, as the magnitude and sign of the change are variable.
- Full Text:
- Date Issued: 2009
- Authors: Midgley, John M , Villet, Martin H
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6857 , http://hdl.handle.net/10962/d1011140
- Description: It is recommended that insect larvae collected for forensic purposes should be killed using the same method as was used to create existing models for rate of development. Certain killing methods have been shown to be preferable because they cause less distortion of the specimens, but these are not always practicable in a particular case, and so a method of correcting for effect of killing method is required. Larvae of all instars of Thanatophilus micans (Fabricius 1794) (Coleoptera: Silphidae) were measured and then killed by immersion in ethanol, immersion in hot water or freezing. Samples were re-measured immediately after death, then stored in excess 70% ethanol and re-measured after 1 week and again after 4 weeks. The change in length was significantly different from zero in all samples (t = -9.07022, p < 0.001). An analysis of covariance showed that instar, killing method and storage time all had a significant effect on the change in length. The results showed that T. micans larvae have a great potential for change in length during storage but that the change is not predictable, as the magnitude and sign of the change are variable.
- Full Text:
- Date Issued: 2009
Electrochemical properties of benzylmercapto and dodecylmercapto tetra substituted nickel phthalocyanine complexes: Electrocatalytic oxidation of nitrite
- Agboola, Bolade O, Ozoemena, Kenneth I, Nyokong, Tebello
- Authors: Agboola, Bolade O , Ozoemena, Kenneth I , Nyokong, Tebello
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6562 , http://hdl.handle.net/10962/d1003826
- Description: Nickel tetrakis(benzylmercapto)phthalocyanine (NiTBMPc) and nickel tetrakis(dodecylmercapto)phthalocyanine (NiTDMPc) complexes were synthesized and their spectral and electrochemical properties reported. The CV showed four or five redox processes for NiTBMPc and NiTDMPc, respectively. For the first time, spectroelectrochemistry gave evidence for the formation of NiII/NiI process in a NiPc complex. The rest of the processes were ring based. The NiTBMPc complex was successfully deposited on both gold and glassy carbon electrodes by electropolymerisation while NiTDMPc complex was deposited on gold electrode only. The films were electro-transformed in aqueous 0.1 M NaOH solution to the O–Ni–O oxo bridged form. The modified electrodes were characterized using electrochemical impedance spectroscopy and the results showed typical behavior for modified electrodes. Electrodes with poly-Ni(OH)Pcs films exhibited higher charge transfer resistance values, Rp than their corresponding poly-NiPcs films counterparts. All the modified electrodes showed improved catalytic activities than the unmodified electrodes towards nitrite ions electrooxidation. Better catalytic activities were observed for the modified electrodes when they were transformed to O–Ni–O oxo bridge form. All the modified electrodes exhibited high resistance to electrode surface passivation.
- Full Text:
- Date Issued: 2006
- Authors: Agboola, Bolade O , Ozoemena, Kenneth I , Nyokong, Tebello
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6562 , http://hdl.handle.net/10962/d1003826
- Description: Nickel tetrakis(benzylmercapto)phthalocyanine (NiTBMPc) and nickel tetrakis(dodecylmercapto)phthalocyanine (NiTDMPc) complexes were synthesized and their spectral and electrochemical properties reported. The CV showed four or five redox processes for NiTBMPc and NiTDMPc, respectively. For the first time, spectroelectrochemistry gave evidence for the formation of NiII/NiI process in a NiPc complex. The rest of the processes were ring based. The NiTBMPc complex was successfully deposited on both gold and glassy carbon electrodes by electropolymerisation while NiTDMPc complex was deposited on gold electrode only. The films were electro-transformed in aqueous 0.1 M NaOH solution to the O–Ni–O oxo bridged form. The modified electrodes were characterized using electrochemical impedance spectroscopy and the results showed typical behavior for modified electrodes. Electrodes with poly-Ni(OH)Pcs films exhibited higher charge transfer resistance values, Rp than their corresponding poly-NiPcs films counterparts. All the modified electrodes showed improved catalytic activities than the unmodified electrodes towards nitrite ions electrooxidation. Better catalytic activities were observed for the modified electrodes when they were transformed to O–Ni–O oxo bridge form. All the modified electrodes exhibited high resistance to electrode surface passivation.
- Full Text:
- Date Issued: 2006
Elephants, compassion, and the largesse of literature
- Authors: Wylie, Dan
- Date: 2011
- Language: English
- Type: Text
- Identifier: vital:582 , http://hdl.handle.net/10962/d1018924
- Description: [From the text] Why is it that we do not raise a monument, a mausoleum, nor even a humble gravestone, to mark the death of every elephant? We habitually, even compulsively, do this for other humans, occasionally for treasured pets. Yet we do not do it for the most charismatic, gigantic, culturally resonant land animal we will ever encounter. Why not? Some possible answers. One: too much work. Another: we regard other animals as less conscious than ourselves; we are the only creatures who deserve to have our deaths so commemorated. A third: wild animals are part of wild ecosystems; it is ‘natural’ for them to die and to be reabsorbed namelessly back into those ecosystems. We humans, on the other hand, consider ourselves somehow separate from those ecosystems: we shield ourselves from ‘Nature’ with bricks and literatures while we live, with marble and epitaphs after we die.
- Full Text:
- Date Issued: 2011
- Authors: Wylie, Dan
- Date: 2011
- Language: English
- Type: Text
- Identifier: vital:582 , http://hdl.handle.net/10962/d1018924
- Description: [From the text] Why is it that we do not raise a monument, a mausoleum, nor even a humble gravestone, to mark the death of every elephant? We habitually, even compulsively, do this for other humans, occasionally for treasured pets. Yet we do not do it for the most charismatic, gigantic, culturally resonant land animal we will ever encounter. Why not? Some possible answers. One: too much work. Another: we regard other animals as less conscious than ourselves; we are the only creatures who deserve to have our deaths so commemorated. A third: wild animals are part of wild ecosystems; it is ‘natural’ for them to die and to be reabsorbed namelessly back into those ecosystems. We humans, on the other hand, consider ourselves somehow separate from those ecosystems: we shield ourselves from ‘Nature’ with bricks and literatures while we live, with marble and epitaphs after we die.
- Full Text:
- Date Issued: 2011
Estimating rainfall and water balance over the Okavango River Basin for hydrological applications
- Wilk, J, Kniveton, D, Andersson, L, Layberry, R, Todd, M C, Hughes, Denis A
- Authors: Wilk, J , Kniveton, D , Andersson, L , Layberry, R , Todd, M C , Hughes, Denis A
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:7084 , http://hdl.handle.net/10962/d1012343 , http://dx.doi.org/10.1016/j.jhydrol.2006.04.049
- Description: A historical database for use in rainfall-runoff modeling of the Okavango River Basin in Southwest Africa is presented. The work has relevance for similar data-sparse regions. The parameters of main concern are rainfall and catchment water balance, which are key variables for subsequent studies of the hydrological impacts of development and climate change. Rainfall estimates are based on a combination of in situ gauges and satellite sources. Rain gauge measurements are most extensive from 1955 to 1972, after which they are drastically reduced due to the Angolan civil war. The sensitivity of the rainfall fields to spatial interpolation techniques and the density of gauges were evaluated. Satellite based rainfall estimates for the basin are developed for the period from 1991 onwards, based on the Tropical Rainfall Measuring Mission (TRMM) and Special Sensor Microwave Imager (SSM/I) datasets. The consistency between the gauges and satellite estimates was considered. A methodology was developed to allow calibration of the rainfall-runoff hydrological model against rain gauge data from 1960 to 1972, with the prerequisite that the model should be driven by satellite derived rainfall products from 1990 onwards. With the rain gauge data, addition of a single rainfall station (Longa) in regions where stations earlier were lacking was more important than the chosen interpolation method. Comparison of satellite and gauge rainfall outside the basin indicated that the satellite overestimates rainfall by 20%. A non-linear correction was derived by fitting the rainfall frequency characteristics to those of the historical rainfall data. This satellite rainfall dataset was found satisfactory when using the Pitman rainfall-runoff model (Hughes, D., Andersson, L., Wilk, J., Savenije, H.H.G., this issue. Regional calibration of the Pitman model for the Okavango River. Journal of Hydrology). Intensive monitoring in the region is recommended to increase accuracy of the comprehensive satellite rainfall estimate calibration procedure.
- Full Text:
- Date Issued: 2006
- Authors: Wilk, J , Kniveton, D , Andersson, L , Layberry, R , Todd, M C , Hughes, Denis A
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:7084 , http://hdl.handle.net/10962/d1012343 , http://dx.doi.org/10.1016/j.jhydrol.2006.04.049
- Description: A historical database for use in rainfall-runoff modeling of the Okavango River Basin in Southwest Africa is presented. The work has relevance for similar data-sparse regions. The parameters of main concern are rainfall and catchment water balance, which are key variables for subsequent studies of the hydrological impacts of development and climate change. Rainfall estimates are based on a combination of in situ gauges and satellite sources. Rain gauge measurements are most extensive from 1955 to 1972, after which they are drastically reduced due to the Angolan civil war. The sensitivity of the rainfall fields to spatial interpolation techniques and the density of gauges were evaluated. Satellite based rainfall estimates for the basin are developed for the period from 1991 onwards, based on the Tropical Rainfall Measuring Mission (TRMM) and Special Sensor Microwave Imager (SSM/I) datasets. The consistency between the gauges and satellite estimates was considered. A methodology was developed to allow calibration of the rainfall-runoff hydrological model against rain gauge data from 1960 to 1972, with the prerequisite that the model should be driven by satellite derived rainfall products from 1990 onwards. With the rain gauge data, addition of a single rainfall station (Longa) in regions where stations earlier were lacking was more important than the chosen interpolation method. Comparison of satellite and gauge rainfall outside the basin indicated that the satellite overestimates rainfall by 20%. A non-linear correction was derived by fitting the rainfall frequency characteristics to those of the historical rainfall data. This satellite rainfall dataset was found satisfactory when using the Pitman rainfall-runoff model (Hughes, D., Andersson, L., Wilk, J., Savenije, H.H.G., this issue. Regional calibration of the Pitman model for the Okavango River. Journal of Hydrology). Intensive monitoring in the region is recommended to increase accuracy of the comprehensive satellite rainfall estimate calibration procedure.
- Full Text:
- Date Issued: 2006
Evolution of a strongly differentiated suite of phonolites from the Klinghardt Mountains, Namibia
- Authors: Marsh, Julian S
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/140400 , vital:37885 , https://doi.org/10.1016/0024-4937(87)90023-5
- Description: Phonolites of Tertiary age occur as eroded tholoids, lava flows, ignimbrites, and coulees in the Klinghardt Mountains of southern Namibia. Sixty samples have been analyzed for major and trace elements and fourteen of these for 87SR 86SR. The phonolites lie close to the low-pressure cotectics in Q-Ne-Ks, in keeping with their petrography which indicates that most samples have phenocrysts of both nepheline and sanidine. Na has been variably lost from the rocks during crystallization and devitrification/alteration of hypocrystalline specimens.
- Full Text: false
- Date Issued: 2003
- Authors: Marsh, Julian S
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/140400 , vital:37885 , https://doi.org/10.1016/0024-4937(87)90023-5
- Description: Phonolites of Tertiary age occur as eroded tholoids, lava flows, ignimbrites, and coulees in the Klinghardt Mountains of southern Namibia. Sixty samples have been analyzed for major and trace elements and fourteen of these for 87SR 86SR. The phonolites lie close to the low-pressure cotectics in Q-Ne-Ks, in keeping with their petrography which indicates that most samples have phenocrysts of both nepheline and sanidine. Na has been variably lost from the rocks during crystallization and devitrification/alteration of hypocrystalline specimens.
- Full Text: false
- Date Issued: 2003
Exploratory mathematics talk in a second language: a sociolinguistic perspective:
- Graven, Mellony, Robertson, Sally-Ann
- Authors: Graven, Mellony , Robertson, Sally-Ann
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69907 , vital:29594 , https://doi.org/10.1007/s11858-018-0952-2
- Description: This paper illuminates challenges confronting teachers and students at the literacy/numeracy interface in contexts where students have not developed sufficient English language proficiency to be learning mathematics through English but, due to socio-politically and economically driven perceptions are being taught in English. We analyse transcript data of classroom talk in a South African grade 4 mathematics lesson on fractions. Together with interview data, the lesson data highlight some of the consequences students’ diminished access to their home language appear to have on their access to mathematical meaning-making.
- Full Text:
- Date Issued: 2009
- Authors: Graven, Mellony , Robertson, Sally-Ann
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69907 , vital:29594 , https://doi.org/10.1007/s11858-018-0952-2
- Description: This paper illuminates challenges confronting teachers and students at the literacy/numeracy interface in contexts where students have not developed sufficient English language proficiency to be learning mathematics through English but, due to socio-politically and economically driven perceptions are being taught in English. We analyse transcript data of classroom talk in a South African grade 4 mathematics lesson on fractions. Together with interview data, the lesson data highlight some of the consequences students’ diminished access to their home language appear to have on their access to mathematical meaning-making.
- Full Text:
- Date Issued: 2009
Fatty acid profiles reveal temporal and spatial differentiation in diets within and among syntopic rocky shore suspension-feeders:
- Richoux, Nicole B, Vermeulen, Ilke, Froneman, P William
- Authors: Richoux, Nicole B , Vermeulen, Ilke , Froneman, P William
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143346 , vital:38238 , doi: 10.3354/meps10581
- Description: Regional and temporal variations in the diets of rocky shore suspension-feeders (the volcano barnacle Tetraclita serrata, the brown mussel Perna perna and the reef-building polychaete Gunnarea gaimardi) were assessed using fatty acid profiling. Specimens were collected up-current and down-current of a river mouth in 2 coastal regions ~50 km apart along southeastern South Africa during March and July of 2009. One of the rivers represents a marine-dominated system, and the other a freshwater-dominated system. Our aims were to assess any dietary differences among the 3 suspension-feeders, spatial changes in diet within each species (at regional and local scales—50 and 15 km, respectively), and temporal changes in diet within each species.
- Full Text:
- Date Issued: 2014
- Authors: Richoux, Nicole B , Vermeulen, Ilke , Froneman, P William
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143346 , vital:38238 , doi: 10.3354/meps10581
- Description: Regional and temporal variations in the diets of rocky shore suspension-feeders (the volcano barnacle Tetraclita serrata, the brown mussel Perna perna and the reef-building polychaete Gunnarea gaimardi) were assessed using fatty acid profiling. Specimens were collected up-current and down-current of a river mouth in 2 coastal regions ~50 km apart along southeastern South Africa during March and July of 2009. One of the rivers represents a marine-dominated system, and the other a freshwater-dominated system. Our aims were to assess any dietary differences among the 3 suspension-feeders, spatial changes in diet within each species (at regional and local scales—50 and 15 km, respectively), and temporal changes in diet within each species.
- Full Text:
- Date Issued: 2014
Fish utilization of surf-zones. Are they changing? A case study of the sheltered, warm-temperate King’s Beach
- Rishworth, Gavin M, Strydom, Nadine A, Potts, Warren M
- Authors: Rishworth, Gavin M , Strydom, Nadine A , Potts, Warren M
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124504 , vital:35619 , https://doi.org/10.1080/15627020.2014.11407616
- Description: Surf-zone fish communities and their shifts over time are generally poorly understood. The aim of this study was to compare the current surf-zone fish assemblage at King’s Beach, South Africa, to a similar study conducted three decades ago, before the collapse of many exploited shore fishes in the region. Beach seine nets (mesh sizes of 10 and 50 mm) were used to target juvenile and adult fishes bimonthly from February to August 2011 over the high tide around sunset. A total of 14 species were recorded in both the 30mand 100mseine nets. The catch in these seine nets was dominated by Pomadasys olivaceus and Liza richardsonii, and this was significantly different to three decades ago, when P. olivaceus, Sarpa salpa and Diplodus capensis dominated the catch. Important linefish species belonging to the Sparidae and Sciaenidae families were significantly smaller and less abundant in this study. Two sparids, S. salpa and Lithognathus mormyrus, which made a large contribution to the surf-zone catch three decades ago were absent during this study. Reasons for the significant shifts in the surf-zone fish community, including overexploitation of the linefish and potential habitat modification, are discussed.
- Full Text:
- Date Issued: 2015
- Authors: Rishworth, Gavin M , Strydom, Nadine A , Potts, Warren M
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124504 , vital:35619 , https://doi.org/10.1080/15627020.2014.11407616
- Description: Surf-zone fish communities and their shifts over time are generally poorly understood. The aim of this study was to compare the current surf-zone fish assemblage at King’s Beach, South Africa, to a similar study conducted three decades ago, before the collapse of many exploited shore fishes in the region. Beach seine nets (mesh sizes of 10 and 50 mm) were used to target juvenile and adult fishes bimonthly from February to August 2011 over the high tide around sunset. A total of 14 species were recorded in both the 30mand 100mseine nets. The catch in these seine nets was dominated by Pomadasys olivaceus and Liza richardsonii, and this was significantly different to three decades ago, when P. olivaceus, Sarpa salpa and Diplodus capensis dominated the catch. Important linefish species belonging to the Sparidae and Sciaenidae families were significantly smaller and less abundant in this study. Two sparids, S. salpa and Lithognathus mormyrus, which made a large contribution to the surf-zone catch three decades ago were absent during this study. Reasons for the significant shifts in the surf-zone fish community, including overexploitation of the linefish and potential habitat modification, are discussed.
- Full Text:
- Date Issued: 2015
Foreign policy ambiguity on the part of an emergent middle power: South African foreign policy through other lenses
- Serrão, Olivier, Bischoff, Paul, 1954-
- Authors: Serrão, Olivier , Bischoff, Paul, 1954-
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161464 , vital:40629 , DOI: 10.1080/02589341003600189
- Description: This paper attempts to address the ambiguity so frequently highlighted in South Africa's post-apartheid foreign policy. Three central arguments are put forward. Firstly, it is argued that traditional accounts of South Africa's foreign policy, utilizing rationalist or ‘mainstream’ theories of International Relations, are insufficient in themselves to explain the complexities inherent in the country's foreign policy. In this regard, constructivist IR theory offers several key insights into studies of South Africa's foreign policy. Secondly, although it is argued that constructivism, particularly its focus on identity, is crucial to understanding South African foreign policy, it alone cannot sufficiently explain its reception or results on the world stage. Finally, it is argued that in order to fully appreciate both the nature and effects of South Africa's foreign policy, a mixed focus, incorporating insights from both constructivist and materialist-based theories of IR, is necessary.
- Full Text:
- Date Issued: 2009
- Authors: Serrão, Olivier , Bischoff, Paul, 1954-
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161464 , vital:40629 , DOI: 10.1080/02589341003600189
- Description: This paper attempts to address the ambiguity so frequently highlighted in South Africa's post-apartheid foreign policy. Three central arguments are put forward. Firstly, it is argued that traditional accounts of South Africa's foreign policy, utilizing rationalist or ‘mainstream’ theories of International Relations, are insufficient in themselves to explain the complexities inherent in the country's foreign policy. In this regard, constructivist IR theory offers several key insights into studies of South Africa's foreign policy. Secondly, although it is argued that constructivism, particularly its focus on identity, is crucial to understanding South African foreign policy, it alone cannot sufficiently explain its reception or results on the world stage. Finally, it is argued that in order to fully appreciate both the nature and effects of South Africa's foreign policy, a mixed focus, incorporating insights from both constructivist and materialist-based theories of IR, is necessary.
- Full Text:
- Date Issued: 2009