Empirically modelled Pc3 activity based on solar wind parameters
- Heilig, B, Lotz, S I, Verő, J, Sutcliffe, P, Reda, J, Pajunpää, G, Raita, T
- Authors: Heilig, B , Lotz, S I , Verő, J , Sutcliffe, P , Reda, J , Pajunpää, G , Raita, T
- Date: 2010
- Language: English
- Type: text , Article
- Identifier: vital:6814 , http://hdl.handle.net/10962/d1004324
- Description: It is known that under certain solar wind (SW)/interplanetary magnetic field (IMF) conditions (e.g. high SW speed, low cone angle) the occurrence of ground-level Pc3–4 pulsations is more likely. In this paper we demonstrate that in the event of anomalously low SW particle density, Pc3 activity is extremely low regardless of otherwise favourable SW speed and cone angle. We re-investigate the SW control of Pc3 pulsation activity through a statistical analysis and two empirical models with emphasis on the influence of SW density on Pc3 activity. We utilise SW and IMF measurements from the OMNI project and ground-based magnetometer measurements from the MM100 array to relate SW and IMF measurements to the occurrence of Pc3 activity. Multiple linear regression and artificial neural network models are used in iterative processes in order to identify sets of SW-based input parameters, which optimally reproduce a set of Pc3 activity data. The inclusion of SW density in the parameter set significantly improves the models. Not only the density itself, but other density related parameters, such as the dynamic pressure of the SW, or the standoff distance of the magnetopause work equally well in the model. The disappearance of Pc3s during low-density events can have at least four reasons according to the existing upstream wave theory: 1. Pausing the ion-cyclotron resonance that generates the upstream ultra low frequency waves in the absence of protons, 2. Weakening of the bow shock that implies less efficient reflection, 3. The SW becomes sub-Alfvénic and hence it is not able to sweep back the waves propagating upstream with the Alfvén-speed, and 4. The increase of the standoff distance of the magnetopause (and of the bow shock). Although the models cannot account for the lack of Pc3s during intervals when the SW density is extremely low, the resulting sets of optimal model inputs support the generation of mid latitude Pc3 activity predominantly through upstream waves.
- Full Text:
- Date Issued: 2010
- Authors: Heilig, B , Lotz, S I , Verő, J , Sutcliffe, P , Reda, J , Pajunpää, G , Raita, T
- Date: 2010
- Language: English
- Type: text , Article
- Identifier: vital:6814 , http://hdl.handle.net/10962/d1004324
- Description: It is known that under certain solar wind (SW)/interplanetary magnetic field (IMF) conditions (e.g. high SW speed, low cone angle) the occurrence of ground-level Pc3–4 pulsations is more likely. In this paper we demonstrate that in the event of anomalously low SW particle density, Pc3 activity is extremely low regardless of otherwise favourable SW speed and cone angle. We re-investigate the SW control of Pc3 pulsation activity through a statistical analysis and two empirical models with emphasis on the influence of SW density on Pc3 activity. We utilise SW and IMF measurements from the OMNI project and ground-based magnetometer measurements from the MM100 array to relate SW and IMF measurements to the occurrence of Pc3 activity. Multiple linear regression and artificial neural network models are used in iterative processes in order to identify sets of SW-based input parameters, which optimally reproduce a set of Pc3 activity data. The inclusion of SW density in the parameter set significantly improves the models. Not only the density itself, but other density related parameters, such as the dynamic pressure of the SW, or the standoff distance of the magnetopause work equally well in the model. The disappearance of Pc3s during low-density events can have at least four reasons according to the existing upstream wave theory: 1. Pausing the ion-cyclotron resonance that generates the upstream ultra low frequency waves in the absence of protons, 2. Weakening of the bow shock that implies less efficient reflection, 3. The SW becomes sub-Alfvénic and hence it is not able to sweep back the waves propagating upstream with the Alfvén-speed, and 4. The increase of the standoff distance of the magnetopause (and of the bow shock). Although the models cannot account for the lack of Pc3s during intervals when the SW density is extremely low, the resulting sets of optimal model inputs support the generation of mid latitude Pc3 activity predominantly through upstream waves.
- Full Text:
- Date Issued: 2010
Ethics, cultures, fraud and corruption: the unanswered questions
- Authors: Fourie, Houdini
- Subjects: Fraud -- Moral and ethical aspects , Fraud -- South Africa , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/31797 , vital:31846
- Description: idea for the paper emanated from my concern regarding the absolute flood of unethical behaviour in recent times. Fraud and corruption in South Africa is rife and it seems that the average person has no control over what comes next. Considering the impacts of peoples’ background, social standing and culture, the paper considered the psychological processes through which learning of habits and mannerisms take place; and how it influences ethical behaviour. Valuable lessons are learnt, namely that culture, whether it being ethnical, organisational, family or religious, have a direct impact on a person’s ethical value system and subsequently on whether a person is inclined to partake in fraud and corrupt activities. Fraud and corruption can cripple and destroy organisations and its auditors. Fraud and corruption are costly. The paper reports that it is ultimately the responsibility of executive management to manage fraud and associated risks – management must set the “Tone at the Top”. Managing ethics is costly, but ignoring it is fatal. Although it is not the primary responsibility of auditors to detect and investigate fraud and corruption, the accounting profession needs to do introspection to determine what society expects of them. A mere audit opinion on annual financial statements does not satisfy the demands of society any more. The question is apparently not whether fraud will occur in organisations, but rather when and that everybody must insist on doing the right thing – for the greater good.
- Full Text:
- Authors: Fourie, Houdini
- Subjects: Fraud -- Moral and ethical aspects , Fraud -- South Africa , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/31797 , vital:31846
- Description: idea for the paper emanated from my concern regarding the absolute flood of unethical behaviour in recent times. Fraud and corruption in South Africa is rife and it seems that the average person has no control over what comes next. Considering the impacts of peoples’ background, social standing and culture, the paper considered the psychological processes through which learning of habits and mannerisms take place; and how it influences ethical behaviour. Valuable lessons are learnt, namely that culture, whether it being ethnical, organisational, family or religious, have a direct impact on a person’s ethical value system and subsequently on whether a person is inclined to partake in fraud and corrupt activities. Fraud and corruption can cripple and destroy organisations and its auditors. Fraud and corruption are costly. The paper reports that it is ultimately the responsibility of executive management to manage fraud and associated risks – management must set the “Tone at the Top”. Managing ethics is costly, but ignoring it is fatal. Although it is not the primary responsibility of auditors to detect and investigate fraud and corruption, the accounting profession needs to do introspection to determine what society expects of them. A mere audit opinion on annual financial statements does not satisfy the demands of society any more. The question is apparently not whether fraud will occur in organisations, but rather when and that everybody must insist on doing the right thing – for the greater good.
- Full Text:
Exploring grade 3 teachers’ resistance to ‘take up’progressive mathematics teaching roles
- Graven, Mellony, Westaway, Lise
- Authors: Graven, Mellony , Westaway, Lise
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69700 , vital:29568 , https://DOI: 10.1007/s13394-018-0237-7
- Description: This article addresses the question: Why teachers of mathematics have yet to ‘take up’ progressive roles? Drawing on the philosophy of critical realism and its methodological equivalent, social realism, we analyse interview and observation data of four grade 3 teachers, with the view to identifying the mechanisms conditioning the expression of teachers’ identities. In so doing, we show how post-apartheid changes in systemic roles of teachers create contradictory tensions for teachers as these bring their own mathematical learning and teaching experiences into contradiction with the new post-apartheid roles they are mandated to enact. We examine how this contradiction, together with beliefs about mathematics, pedagogy and learners, is expressed in the teaching of grade 3 mathematics. We maintain that the complementarity between teachers’ beliefs and old systemic roles provides an explanation for why teachers of grade 3 mathematics have yet to ‘take-up’ progressive roles. The implications point to the need for teacher development that creates enablers that lead to changes in classroom practices that align with policy-designated, progressive roles in teaching mathematics.
- Full Text:
- Date Issued: 2018
- Authors: Graven, Mellony , Westaway, Lise
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/69700 , vital:29568 , https://DOI: 10.1007/s13394-018-0237-7
- Description: This article addresses the question: Why teachers of mathematics have yet to ‘take up’ progressive roles? Drawing on the philosophy of critical realism and its methodological equivalent, social realism, we analyse interview and observation data of four grade 3 teachers, with the view to identifying the mechanisms conditioning the expression of teachers’ identities. In so doing, we show how post-apartheid changes in systemic roles of teachers create contradictory tensions for teachers as these bring their own mathematical learning and teaching experiences into contradiction with the new post-apartheid roles they are mandated to enact. We examine how this contradiction, together with beliefs about mathematics, pedagogy and learners, is expressed in the teaching of grade 3 mathematics. We maintain that the complementarity between teachers’ beliefs and old systemic roles provides an explanation for why teachers of grade 3 mathematics have yet to ‘take-up’ progressive roles. The implications point to the need for teacher development that creates enablers that lead to changes in classroom practices that align with policy-designated, progressive roles in teaching mathematics.
- Full Text:
- Date Issued: 2018
Festival fringe production and the long tail
- Authors: Snowball, Jeanette D
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68855 , vital:29332 , http://www.econrsa.org/node/1170
- Description: Publisher version , In the past 15 years, there has been a worldwide proliferation of arts festivals, including so-called "fringe" festivals, which encouraged more experimental and avant-garde productions. While fringe festival productions had the potential to generate significant income for producers, their aims were primarily related to artistic innovation and it is well known that putting on a fringe show is highly unlikely to provide financial gain for most producers. This is what is referred to in statistics and marketing as a "long tail" distribution, in which a minority of producers in a particular market earn the vast majority of industry income. However, for individual producers of live theatre, such a distribution represents high risks and potentially large financial losses. This article uses producer data from two different fringe festivals in South Africa to explore determinants of ticket sales and box-office income. Included in the analysis is a consideration of the impact of genre and pricing strategies on the probability (Logit model) of shows being in the top 10%, 30% and 50% of best-selling and earning productions. Results support the long tail hypothesis.
- Full Text:
- Date Issued: 2016
- Authors: Snowball, Jeanette D
- Date: 2016
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68855 , vital:29332 , http://www.econrsa.org/node/1170
- Description: Publisher version , In the past 15 years, there has been a worldwide proliferation of arts festivals, including so-called "fringe" festivals, which encouraged more experimental and avant-garde productions. While fringe festival productions had the potential to generate significant income for producers, their aims were primarily related to artistic innovation and it is well known that putting on a fringe show is highly unlikely to provide financial gain for most producers. This is what is referred to in statistics and marketing as a "long tail" distribution, in which a minority of producers in a particular market earn the vast majority of industry income. However, for individual producers of live theatre, such a distribution represents high risks and potentially large financial losses. This article uses producer data from two different fringe festivals in South Africa to explore determinants of ticket sales and box-office income. Included in the analysis is a consideration of the impact of genre and pricing strategies on the probability (Logit model) of shows being in the top 10%, 30% and 50% of best-selling and earning productions. Results support the long tail hypothesis.
- Full Text:
- Date Issued: 2016
From the Booth to the Dock: 2018 elections in Zimbabwe and the elusive search for electoral integrity
- Mwonzora, Gift, Xaba, Mzingaye Brilliant
- Authors: Mwonzora, Gift , Xaba, Mzingaye Brilliant
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159946 , vital:40358 , https://doi.org/10.1080/14662043.2020.1813457
- Description: The issue of presidential election petitions seems to be repeating itself with regularity in much of Africa, thus warranting the need for thorough analysis. Utilising the 2018 presidential election petition in Zimbabwe, the article examines whether electoral integrity and legitimacy can be derived from court-based action. Data for this article was gleaned from case law analysis, review of expert analysis from constitutional lawyers and election experts, video evidence, in-depth and critical reading of grey material. The article concludes that there are limitations in relying on litigation in seeking to realise electoral justice in much of Africa, including in Zimbabwe.
- Full Text:
- Date Issued: 2020
- Authors: Mwonzora, Gift , Xaba, Mzingaye Brilliant
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159946 , vital:40358 , https://doi.org/10.1080/14662043.2020.1813457
- Description: The issue of presidential election petitions seems to be repeating itself with regularity in much of Africa, thus warranting the need for thorough analysis. Utilising the 2018 presidential election petition in Zimbabwe, the article examines whether electoral integrity and legitimacy can be derived from court-based action. Data for this article was gleaned from case law analysis, review of expert analysis from constitutional lawyers and election experts, video evidence, in-depth and critical reading of grey material. The article concludes that there are limitations in relying on litigation in seeking to realise electoral justice in much of Africa, including in Zimbabwe.
- Full Text:
- Date Issued: 2020
Futures studies for the southern African region : ‘from Africa’ not ‘on Africa’
- Fox, Roddy C, Rowntree, Kate M, Kaskinen, J
- Authors: Fox, Roddy C , Rowntree, Kate M , Kaskinen, J
- Date: 2012
- Language: English
- Type: Conference paper
- Identifier: vital:6668 , http://hdl.handle.net/10962/d1006685
- Description: Futures studies is well established in the Nordic region and its history can be readily charted, but in Africa it barely exists in an institutional form and its evolution and impact is little known or understood. The first two sections of our paper briefly examine the history of futures studies, spending most attention on the African experience. We go on to show that the Higher Education landscape in the Southern African Development Community (SADC) region is very different to that in the Nordic region. Recent futures reports present forecasts and scenarios that show a differentiated Higher Education landscape in the SADC; there are few Higher Education Institutions (HEIs) and even the most optimistic forecasts show that the region as a whole will not meet the international enrollment norm of 30% by 2050. The last part of the paper examines our experience of collaboration with Finland and its well developed linkages between state and Universities. One outcome of three years of collaboration from 2007 to 2009 between two SANORD members, the Finland Futures Research Centre (now a part of the University of Turku) and Rhodes University, was a proposal to develop a multi-disciplinary, inter-institutional futures studies program intended to help Africa find its own voice in futures studies. The final part of our presentation reflects on the unsuccessful experiences that we have had to date in finding funding. We conclude by asking whether our experience can be seen as highlighting some of the challenges SANORD may be positioned to overcome if the SADC region’s HEIs are to achieve the Knowledge Village scenario and begin to match their Nordic counterparts.
- Full Text:
- Date Issued: 2012
- Authors: Fox, Roddy C , Rowntree, Kate M , Kaskinen, J
- Date: 2012
- Language: English
- Type: Conference paper
- Identifier: vital:6668 , http://hdl.handle.net/10962/d1006685
- Description: Futures studies is well established in the Nordic region and its history can be readily charted, but in Africa it barely exists in an institutional form and its evolution and impact is little known or understood. The first two sections of our paper briefly examine the history of futures studies, spending most attention on the African experience. We go on to show that the Higher Education landscape in the Southern African Development Community (SADC) region is very different to that in the Nordic region. Recent futures reports present forecasts and scenarios that show a differentiated Higher Education landscape in the SADC; there are few Higher Education Institutions (HEIs) and even the most optimistic forecasts show that the region as a whole will not meet the international enrollment norm of 30% by 2050. The last part of the paper examines our experience of collaboration with Finland and its well developed linkages between state and Universities. One outcome of three years of collaboration from 2007 to 2009 between two SANORD members, the Finland Futures Research Centre (now a part of the University of Turku) and Rhodes University, was a proposal to develop a multi-disciplinary, inter-institutional futures studies program intended to help Africa find its own voice in futures studies. The final part of our presentation reflects on the unsuccessful experiences that we have had to date in finding funding. We conclude by asking whether our experience can be seen as highlighting some of the challenges SANORD may be positioned to overcome if the SADC region’s HEIs are to achieve the Knowledge Village scenario and begin to match their Nordic counterparts.
- Full Text:
- Date Issued: 2012
Genes, microbes and man
- Authors: Woods, David R
- Date: 1973
- Language: English
- Type: Text
- Identifier: vital:682 , http://hdl.handle.net/10962/d1020751
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1973
- Authors: Woods, David R
- Date: 1973
- Language: English
- Type: Text
- Identifier: vital:682 , http://hdl.handle.net/10962/d1020751
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1973
Genetic analysis of native and introduced populations of the aquatic weed Sagittaria platyphylla – implications for biological control in Australia and South Africa
- Kwong, Raelene M, Broadhurst, Linda M, Keener, Brian R, Coetzee, Julie A, Knerr, Nunzio, Martin, Grant D
- Authors: Kwong, Raelene M , Broadhurst, Linda M , Keener, Brian R , Coetzee, Julie A , Knerr, Nunzio , Martin, Grant D
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76991 , vital:30653 , https://doi.org/10.1016/j.biocontrol.2017.06.002
- Description: Sagittaria platyphylla (Engelm.) J.G. Sm. (Alismataceae) is an emergent aquatic plant native to southern USA. Imported into Australia and South Africa as an ornamental and aquarium plant, the species is now a serious invader of shallow freshwater wetlands, slow-flowing rivers, irrigation channels, drains and along the margins of lakes and reservoirs. As a first step towards initiating a classical biological control program, a population genetic study was conducted to determine the prospects of finding compatible biological control agents and to refine the search for natural enemies to source populations with closest genetic match to Australian and South African genotypes. Using AFLP markers we surveyed genetic diversity and population genetic structure in 26 populations from the USA, 19 from Australia and 7 from South Africa. Interestingly, we have established that populations introduced into South Africa and to a lesser extent Australia have maintained substantial molecular genetic diversity comparable with that in the native range. Results from principal coordinates analysis, population graph theory and Bayesian-based clustering analysis all support the notion that introduced populations in Australia and South Africa were founded by multiple sources from the USA. Furthermore, the divergence of some Australian populations from the USA suggests that intraspecific hybridization between genetically distinct lineages from the native range may have occurred. The implications of these findings in relation to biological control are discussed.
- Full Text:
- Date Issued: 2017
- Authors: Kwong, Raelene M , Broadhurst, Linda M , Keener, Brian R , Coetzee, Julie A , Knerr, Nunzio , Martin, Grant D
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/76991 , vital:30653 , https://doi.org/10.1016/j.biocontrol.2017.06.002
- Description: Sagittaria platyphylla (Engelm.) J.G. Sm. (Alismataceae) is an emergent aquatic plant native to southern USA. Imported into Australia and South Africa as an ornamental and aquarium plant, the species is now a serious invader of shallow freshwater wetlands, slow-flowing rivers, irrigation channels, drains and along the margins of lakes and reservoirs. As a first step towards initiating a classical biological control program, a population genetic study was conducted to determine the prospects of finding compatible biological control agents and to refine the search for natural enemies to source populations with closest genetic match to Australian and South African genotypes. Using AFLP markers we surveyed genetic diversity and population genetic structure in 26 populations from the USA, 19 from Australia and 7 from South Africa. Interestingly, we have established that populations introduced into South Africa and to a lesser extent Australia have maintained substantial molecular genetic diversity comparable with that in the native range. Results from principal coordinates analysis, population graph theory and Bayesian-based clustering analysis all support the notion that introduced populations in Australia and South Africa were founded by multiple sources from the USA. Furthermore, the divergence of some Australian populations from the USA suggests that intraspecific hybridization between genetically distinct lineages from the native range may have occurred. The implications of these findings in relation to biological control are discussed.
- Full Text:
- Date Issued: 2017
Geotourism, iconic landforms and island-style speciation patterns in National Parks of East Africa:
- Authors: Scoon, Roger N
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158252 , vital:40166 , https://0-doi.org.wam.seals.ac.za/10.1007/s12371-020-00486-z
- Description: Many of the national parks in East Africa are equally as famous for their iconic landforms as they are for their diversity and concentrations of fauna and flora. The newly formed Ngorongoro-Lengai Geopark in northern Tanzania is the first geopark to be established in the region, but there is remarkable potential for geotourism in the majority of the national parks. The most spectacular landforms have been shaped by the East African Rift System. Formation of the two major rifts in the region, the Albertine Rift (or western branch) and the Gregory Rift (or eastern branch), was accompanied, or in some cases preceded, by extensive alkaline volcanism. The rifting and volcanism are primarily Late Cenozoic phenomenon that dissected and overprinted the older regional plateaus. Rifting impacted the regional drainage and captured major rivers, including the Victoria Nile.
- Full Text:
- Date Issued: 2020
- Authors: Scoon, Roger N
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158252 , vital:40166 , https://0-doi.org.wam.seals.ac.za/10.1007/s12371-020-00486-z
- Description: Many of the national parks in East Africa are equally as famous for their iconic landforms as they are for their diversity and concentrations of fauna and flora. The newly formed Ngorongoro-Lengai Geopark in northern Tanzania is the first geopark to be established in the region, but there is remarkable potential for geotourism in the majority of the national parks. The most spectacular landforms have been shaped by the East African Rift System. Formation of the two major rifts in the region, the Albertine Rift (or western branch) and the Gregory Rift (or eastern branch), was accompanied, or in some cases preceded, by extensive alkaline volcanism. The rifting and volcanism are primarily Late Cenozoic phenomenon that dissected and overprinted the older regional plateaus. Rifting impacted the regional drainage and captured major rivers, including the Victoria Nile.
- Full Text:
- Date Issued: 2020
Going against the tide: seeking regulations for private military/security companies in a globalized world
- Authors: Juma, Laurence
- Date: 2011
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/128822 , vital:36163 , https://hdl.handle.net/10520/EJC85398
- Description: This article discusses the role of privatization of security in Africa, but its focus is on private military and security companies (PMSCs). The article proceeds on the basis that there is need for effective regulatory frameworks for PMSCs that operate in conflict zones of Africa. Thus, it begins by appraising the existing normative standards at the international, regional and domestic level that apply to these companies, and thereafter, identifies their shortcomings in light of the prevailing security conditions within the continent. The article then posits broad theoretical imperatives for designing a more effective regulatory framework for PMSCs and concludes by proposing the establishment an overarching continental regime constructed on the basis of the suggested imperatives.
- Full Text: false
- Date Issued: 2011
- Authors: Juma, Laurence
- Date: 2011
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/128822 , vital:36163 , https://hdl.handle.net/10520/EJC85398
- Description: This article discusses the role of privatization of security in Africa, but its focus is on private military and security companies (PMSCs). The article proceeds on the basis that there is need for effective regulatory frameworks for PMSCs that operate in conflict zones of Africa. Thus, it begins by appraising the existing normative standards at the international, regional and domestic level that apply to these companies, and thereafter, identifies their shortcomings in light of the prevailing security conditions within the continent. The article then posits broad theoretical imperatives for designing a more effective regulatory framework for PMSCs and concludes by proposing the establishment an overarching continental regime constructed on the basis of the suggested imperatives.
- Full Text: false
- Date Issued: 2011
Grade-appropriate literacy and South African grade seven learners' classroom writing in English
- Authors: Hendricks, Monica
- Date: 2009
- Language: English
- Type: text , article
- Identifier: vital:7019 , http://hdl.handle.net/10962/d1007173 , https://doi.org/10.1080/03004430600989593
- Description: preprint , This paper reports on the writing of grade 7 learners in English as an additional language at four differently-resourced schools in the Eastern Cape Province, South Africa. Because grade 7 is the start of the senior phase of schooling, it is vital that learners achieve grade-level competence in the language used as medium of instruction. Learning outcome five which states that ‘the learner will be able to use language to think and reason, as well as access, process and use information for learning’ (Department of Education 2002) is particularly relevant. The primary research question asked what the writing practices in grade 7 additional languages were, and how these contribute to the development of learners’ writing. The findings were that literacy practices at all four schools privilege grammar exercises and personal, expressive writing. In terms of Cummins’s (1984) constructs of BICS (Basic Interpersonal Communicative Skill) and CALP (Cognitive Academic Language Proficiency), learners’ written competencies are mainly conversational (BICS). The personal expressive texts which predominate in learners’ writing have done little to develop a formal, impersonal academic register (CALP). Learners need to become familiar with the more abstract impersonal factual genres associated with disciplinary-based knowledge.
- Full Text:
- Date Issued: 2009
- Authors: Hendricks, Monica
- Date: 2009
- Language: English
- Type: text , article
- Identifier: vital:7019 , http://hdl.handle.net/10962/d1007173 , https://doi.org/10.1080/03004430600989593
- Description: preprint , This paper reports on the writing of grade 7 learners in English as an additional language at four differently-resourced schools in the Eastern Cape Province, South Africa. Because grade 7 is the start of the senior phase of schooling, it is vital that learners achieve grade-level competence in the language used as medium of instruction. Learning outcome five which states that ‘the learner will be able to use language to think and reason, as well as access, process and use information for learning’ (Department of Education 2002) is particularly relevant. The primary research question asked what the writing practices in grade 7 additional languages were, and how these contribute to the development of learners’ writing. The findings were that literacy practices at all four schools privilege grammar exercises and personal, expressive writing. In terms of Cummins’s (1984) constructs of BICS (Basic Interpersonal Communicative Skill) and CALP (Cognitive Academic Language Proficiency), learners’ written competencies are mainly conversational (BICS). The personal expressive texts which predominate in learners’ writing have done little to develop a formal, impersonal academic register (CALP). Learners need to become familiar with the more abstract impersonal factual genres associated with disciplinary-based knowledge.
- Full Text:
- Date Issued: 2009
Happiness: a business model
- Authors: Cullen, Margaret
- Subjects: Happiness , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/20956 , vital:29422
- Description: The concept of happiness might appear elusive. It has been extensively analysed by philosophers and historians, who agree that the concept of happiness in antiquity centered on good luck and fortune. Something beyond human agency and therefore controlled by the Gods (McMahon, 2006).Today, happiness is viewed as something over which you can have control and something that can be pursued (Oishi, 2012).
- Full Text:
- Authors: Cullen, Margaret
- Subjects: Happiness , f-sa
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/10948/20956 , vital:29422
- Description: The concept of happiness might appear elusive. It has been extensively analysed by philosophers and historians, who agree that the concept of happiness in antiquity centered on good luck and fortune. Something beyond human agency and therefore controlled by the Gods (McMahon, 2006).Today, happiness is viewed as something over which you can have control and something that can be pursued (Oishi, 2012).
- Full Text:
Hepatitis C and HIV Coinfection in Developing Countries:
- Authors: Tastan Bishop, Özlem
- Date: 2018
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/148228 , vital:38721 , ISBN 9780128032343 , https://books.google.co.za/books?id=XSmlCgAAQBAJanddq=hepatitis+c+in+developing+countriesandsource=gbs_navlinks_s
- Description: Because of the common routes of transmission, hepatitis C virus (HCV) coinfection with HIV is frequent. Of the 36.6 million HIV-infected individuals worldwide, about 25% are also coinfected with HCV. Developing countries face the greatest burden of coinfection. HIV infection has been shown to have a significant impact on the progression of chronic HCV, with a higher risk of cirrhosis and hepatocellular carcinoma (HCC). Because of the improvements in the management and treatment of HIV/AIDS in resource-limited countries, HCV/HIV coinfection is becoming a significant clinical problem and a major cause of morbidity and mortality. HCV/HIV coinfection is characterized by aggressive hepatic fibrogenesis, incidence of cirrhosis, and HCC. HCC is currently a major cause for liver-related deaths in HIV patients. Viral eradication has been difficult to attain with interferon and ribavirin therapies. Novel therapies with direct-acting antiviral agents have been promising for this population. However, access to such expensive regimen is far beyond the capabilities of most resource-limited countries. Yet, studies lag behind those for HCV monoinfection.
- Full Text:
- Date Issued: 2018
- Authors: Tastan Bishop, Özlem
- Date: 2018
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/148228 , vital:38721 , ISBN 9780128032343 , https://books.google.co.za/books?id=XSmlCgAAQBAJanddq=hepatitis+c+in+developing+countriesandsource=gbs_navlinks_s
- Description: Because of the common routes of transmission, hepatitis C virus (HCV) coinfection with HIV is frequent. Of the 36.6 million HIV-infected individuals worldwide, about 25% are also coinfected with HCV. Developing countries face the greatest burden of coinfection. HIV infection has been shown to have a significant impact on the progression of chronic HCV, with a higher risk of cirrhosis and hepatocellular carcinoma (HCC). Because of the improvements in the management and treatment of HIV/AIDS in resource-limited countries, HCV/HIV coinfection is becoming a significant clinical problem and a major cause of morbidity and mortality. HCV/HIV coinfection is characterized by aggressive hepatic fibrogenesis, incidence of cirrhosis, and HCC. HCC is currently a major cause for liver-related deaths in HIV patients. Viral eradication has been difficult to attain with interferon and ribavirin therapies. Novel therapies with direct-acting antiviral agents have been promising for this population. However, access to such expensive regimen is far beyond the capabilities of most resource-limited countries. Yet, studies lag behind those for HCV monoinfection.
- Full Text:
- Date Issued: 2018
Himantura draco, a new species of stingray (Myliobatiformes: Dasyatidae) from South Africa: with a key to the Dasyatidae and the first record of Dasyatis kuhlii (Müller & Henle, 1841) from southern Africa
- Compagno, Leonard J V, Heemstra, Phillip C, J.L.B. Smith Institute of Ichthyology
- Authors: Compagno, Leonard J V , Heemstra, Phillip C , J.L.B. Smith Institute of Ichthyology
- Date: 1984-01
- Subjects: Fishes -- South Africa -- Classification , Stingrays -- Africa, Southern
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/70050 , vital:29610 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 33 , Himantura draco sp.n is described from an immature male specimen of 56 cm disc width collected at Durban. Dasyatis kuhlii is reported from southern Africa based on three specimens from Natal. Records of H. fava, H. imbricata and H. jenkinsii from southern Africa appear to be erroneous, the latter two being misidentifications of H. gerrardi, and the first a misidentified specimen of H. uarnak. Records of H. purpurea are apparently based on Dasyatis violacea and Himantura sp. (possibly H. fai). A key to the 13 species of dasyatids known from southern Africa is presented.
- Full Text:
- Date Issued: 1984-01
- Authors: Compagno, Leonard J V , Heemstra, Phillip C , J.L.B. Smith Institute of Ichthyology
- Date: 1984-01
- Subjects: Fishes -- South Africa -- Classification , Stingrays -- Africa, Southern
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/70050 , vital:29610 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 33 , Himantura draco sp.n is described from an immature male specimen of 56 cm disc width collected at Durban. Dasyatis kuhlii is reported from southern Africa based on three specimens from Natal. Records of H. fava, H. imbricata and H. jenkinsii from southern Africa appear to be erroneous, the latter two being misidentifications of H. gerrardi, and the first a misidentified specimen of H. uarnak. Records of H. purpurea are apparently based on Dasyatis violacea and Himantura sp. (possibly H. fai). A key to the 13 species of dasyatids known from southern Africa is presented.
- Full Text:
- Date Issued: 1984-01
How does subjective well-being evolve with age? A literature review
- López Ulloa, Beatriz Fabiola, Moller, Valerie, Sousa-Poza, Alfonso
- Authors: López Ulloa, Beatriz Fabiola , Moller, Valerie , Sousa-Poza, Alfonso
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67185 , vital:29056 , https://doi.org/10.1007/s12062-013-9085-0
- Description: publisher version , This literature review provides an overview of the theoretical and empirical research in several disciplines on the relation between ageing and subjective well-being, i.e., how subjective well-being evolves across the lifespan. Because of the different methodologies, data sets and samples used, comparison among disciplines and studies is difficult. However, extant studies do show either a U-shaped, inverted U-shaped or linear relation between ageing and subjective well-being.
- Full Text: false
- Date Issued: 2013
- Authors: López Ulloa, Beatriz Fabiola , Moller, Valerie , Sousa-Poza, Alfonso
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67185 , vital:29056 , https://doi.org/10.1007/s12062-013-9085-0
- Description: publisher version , This literature review provides an overview of the theoretical and empirical research in several disciplines on the relation between ageing and subjective well-being, i.e., how subjective well-being evolves across the lifespan. Because of the different methodologies, data sets and samples used, comparison among disciplines and studies is difficult. However, extant studies do show either a U-shaped, inverted U-shaped or linear relation between ageing and subjective well-being.
- Full Text: false
- Date Issued: 2013
How much its own and to what end?: SADC and the culture of security and regional organisation in Southern Africa
- Authors: Bischoff, Paul, 1954-
- Date: 2013
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/161650 , vital:40650 , ISBN 9781134118656
- Description: This book aims to examine the conceptions and practices of security adopted by Regional Organisations (ROs) across the globe. Since the end of the Cold War, there has been an increased focus on regions as a relevant realm for security, with actors within regional contexts identifying a significant degree of interdependency between one another. As a consequence, international security has taken on a distinct regionally institutionalised character, as seen by the increase in calls for greater utilisation of ‘Chapter VIII: Regional Arrangements’ of the UN, in order to create a devolved UN-led system of global security management. However, the idea of a system of global security management is a remote prospect, because divergence seems to be as important as commonality in terms of regional security.
- Full Text:
- Date Issued: 2013
- Authors: Bischoff, Paul, 1954-
- Date: 2013
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/161650 , vital:40650 , ISBN 9781134118656
- Description: This book aims to examine the conceptions and practices of security adopted by Regional Organisations (ROs) across the globe. Since the end of the Cold War, there has been an increased focus on regions as a relevant realm for security, with actors within regional contexts identifying a significant degree of interdependency between one another. As a consequence, international security has taken on a distinct regionally institutionalised character, as seen by the increase in calls for greater utilisation of ‘Chapter VIII: Regional Arrangements’ of the UN, in order to create a devolved UN-led system of global security management. However, the idea of a system of global security management is a remote prospect, because divergence seems to be as important as commonality in terms of regional security.
- Full Text:
- Date Issued: 2013
How to be or not to be? A critical dialogue on the limitations and opportunities of academic development in the current higher education context
- Behari-Leak, Kasturi, Chitanand, N, Padayachee, Kershree, Masehela, L, Vorster, Jo-Anne E, Ganas, Rieta, Merckel, Vanessa
- Authors: Behari-Leak, Kasturi , Chitanand, N , Padayachee, Kershree , Masehela, L , Vorster, Jo-Anne E , Ganas, Rieta , Merckel, Vanessa
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124217 , vital:35577 , https://hdl.handle.net/10520/EJC-13671ff578
- Description: In the tumultuous time we find ourselves, debates about pedagogy have taken centre stage once again. Concerns raised by the student protests of 2015 and 2016 have highlighted the urgent need to re-think traditional teaching, learning and assessment practices, as well as the development of decolonised and transformative curricula.Traditional notions of academic and professional development are now being tested and contested, insofar as they are able to respond to student challenges in appropriate, responsive, legitimate and relevant ways. As a professional organisation dedicated to supporting learning and teaching, the executive team of HELTASA responded to the challenge in this article by engaging with perspectives on the purpose, role and conceptualisation of academic development in the current decolonial moment in the South African Higher Education landscape. Critical processes that enable academics to engage, share thoughts and debate epistemological, pedagogical and methodological options to support students and academics are much needed. And the context and spirit in which these debates occur may be as important as the debates themselves.At its annual conference, the executive team facilitated a critical dialogue with conference delegates on the limitations and opportunities of AD in our current context. Given the diverse teaching and learning contexts and institutional differentiation in the sector, this article explores individual and collective theorised observations, reflections and experiences of the seven facilitators who led the CD. These reflections were analysed and discussed against the backdrop of AD as well as the affordances of CD as a participatory learning and engagement methodology. The findings showed that there is dire need to re-imagine, not only AD’s role but alternative forms of critical engagement in the sector.
- Full Text:
- Date Issued: 2018
- Authors: Behari-Leak, Kasturi , Chitanand, N , Padayachee, Kershree , Masehela, L , Vorster, Jo-Anne E , Ganas, Rieta , Merckel, Vanessa
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124217 , vital:35577 , https://hdl.handle.net/10520/EJC-13671ff578
- Description: In the tumultuous time we find ourselves, debates about pedagogy have taken centre stage once again. Concerns raised by the student protests of 2015 and 2016 have highlighted the urgent need to re-think traditional teaching, learning and assessment practices, as well as the development of decolonised and transformative curricula.Traditional notions of academic and professional development are now being tested and contested, insofar as they are able to respond to student challenges in appropriate, responsive, legitimate and relevant ways. As a professional organisation dedicated to supporting learning and teaching, the executive team of HELTASA responded to the challenge in this article by engaging with perspectives on the purpose, role and conceptualisation of academic development in the current decolonial moment in the South African Higher Education landscape. Critical processes that enable academics to engage, share thoughts and debate epistemological, pedagogical and methodological options to support students and academics are much needed. And the context and spirit in which these debates occur may be as important as the debates themselves.At its annual conference, the executive team facilitated a critical dialogue with conference delegates on the limitations and opportunities of AD in our current context. Given the diverse teaching and learning contexts and institutional differentiation in the sector, this article explores individual and collective theorised observations, reflections and experiences of the seven facilitators who led the CD. These reflections were analysed and discussed against the backdrop of AD as well as the affordances of CD as a participatory learning and engagement methodology. The findings showed that there is dire need to re-imagine, not only AD’s role but alternative forms of critical engagement in the sector.
- Full Text:
- Date Issued: 2018
Intervention in Bosnia-Herzegovina: lessons of peace‐maintenance for Africa?
- Authors: Bischoff, Paul, 1954-
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161365 , vital:40620 , DOI: 10.1080/10220460309545430
- Description: The Bosnian model is potentially a useful model for the development of a new strategic framework for African conflicts, particularly in situations where international organisations such as the United Nations are overstretched and regional organisations wish to take charge of peacebuilding operations.
- Full Text:
- Date Issued: 2003
- Authors: Bischoff, Paul, 1954-
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161365 , vital:40620 , DOI: 10.1080/10220460309545430
- Description: The Bosnian model is potentially a useful model for the development of a new strategic framework for African conflicts, particularly in situations where international organisations such as the United Nations are overstretched and regional organisations wish to take charge of peacebuilding operations.
- Full Text:
- Date Issued: 2003
Jesus, Che, Luaty: on the relationship between a digital picture and an iconic image in political iconography in Angola
- Authors: Siegert, Nadine
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145919 , vital:38478 , DOI: 10.2979/africatoday.65.1.04
- Description: This essay makes a close examination of a selection of images of the Angolan rapper Luaty Beirão, who became internationally known as a political activist during his imprisonment in June 2015, accused of staging a coup d'état. By analyzing and interpreting images that were highly mediatized during that period, this article shows how political iconography can be traced back to Christian iconography and other images. Such filiations of images and their mediatization invoke a power that contributes to the formation of political and popular icons. This article analyzes this nexus by deconstructing the transmutation of a photograph into a popular icon.
- Full Text:
- Date Issued: 2018
- Authors: Siegert, Nadine
- Date: 2018
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145919 , vital:38478 , DOI: 10.2979/africatoday.65.1.04
- Description: This essay makes a close examination of a selection of images of the Angolan rapper Luaty Beirão, who became internationally known as a political activist during his imprisonment in June 2015, accused of staging a coup d'état. By analyzing and interpreting images that were highly mediatized during that period, this article shows how political iconography can be traced back to Christian iconography and other images. Such filiations of images and their mediatization invoke a power that contributes to the formation of political and popular icons. This article analyzes this nexus by deconstructing the transmutation of a photograph into a popular icon.
- Full Text:
- Date Issued: 2018
Journalism students’ motivations and expectations of their work in comparative perspective:
- Hanusch, Folker, Mellado, Claudia, Boshoff, Priscilla A, Humanes, María Luisa, De León, Salvador, Pereira, Fabio, Márquez Ramírez, Mireya, Roses, Sergio, Subervi, Federico, Wyss, Vinzenz, Yez, Lyuba
- Authors: Hanusch, Folker , Mellado, Claudia , Boshoff, Priscilla A , Humanes, María Luisa , De León, Salvador , Pereira, Fabio , Márquez Ramírez, Mireya , Roses, Sergio , Subervi, Federico , Wyss, Vinzenz , Yez, Lyuba
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143425 , vital:38245 , DOI: 10.1177/1077695814554295
- Description: Based on a survey of 4,393 journalism students in Australia, Brazil, Chile, Mexico, South Africa, Spain, Switzerland, and the United States, this study provides much-needed comparative evidence about students’ motivations for becoming journalists, their future job plans, and expectations. Findings show not only an almost universal decline in students’ desire to work in journalism by the end of their program but also important national differences in terms of the journalistic fields in which they want to work, as well as their job expectations. The results reinforce the need to take into account national contexts when examining journalism education across the globe.
- Full Text:
- Date Issued: 2015
- Authors: Hanusch, Folker , Mellado, Claudia , Boshoff, Priscilla A , Humanes, María Luisa , De León, Salvador , Pereira, Fabio , Márquez Ramírez, Mireya , Roses, Sergio , Subervi, Federico , Wyss, Vinzenz , Yez, Lyuba
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143425 , vital:38245 , DOI: 10.1177/1077695814554295
- Description: Based on a survey of 4,393 journalism students in Australia, Brazil, Chile, Mexico, South Africa, Spain, Switzerland, and the United States, this study provides much-needed comparative evidence about students’ motivations for becoming journalists, their future job plans, and expectations. Findings show not only an almost universal decline in students’ desire to work in journalism by the end of their program but also important national differences in terms of the journalistic fields in which they want to work, as well as their job expectations. The results reinforce the need to take into account national contexts when examining journalism education across the globe.
- Full Text:
- Date Issued: 2015