Challenging desire : performing whiteness in post-apartheid South Africa
- Authors: Smit, Sonja
- Date: 2014
- Subjects: Performance art -- South Africa , Bailey, Brett, 1967- , Cohen, Steven, 1962- , Antwoord (Musical group) , MacGarry, Michael , Eurocentrism -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2164 , http://hdl.handle.net/10962/d1016358
- Description: The central argument of this thesis asserts that in the process of challenging dominant subject positions, such as whiteness, performance creates the possibilities for new or alternative arrangements of desire. It examines how the creative process of desire is forestalled (reified) by habitual representations of whiteness as a privileged position, and proposes that performance can be a valid form of resistance to static conceptions of race and subjectivity. The discussion takes into account how the privilege of whiteness finds representation through forms of neo-liberalism and neo-colonialism in the post apartheid context. The analysis focuses on the work of white South African artists whose work offers a critique from within the privileged “centre” of whiteness. The research is situated within the inter-disciplinary field of performance studies entailing a reading and application of critical texts to the analysis. Alongside this qualitative methodology surfaces a subjective dialogue with the information presented on whiteness. Part Two includes an analysis of Steven Cohen’s The Cradle of Humankind (2011), Brett Bailey’s Exhibit A (2011) and Michael MacGarry’s LHR-JNB (2010). Each section examines the way in which the respective works engage in a questioning of whiteness through performance. Part Three investigates South African rap-rave duo, Die Antwoord and how their appropriation of Zef interrogates desires for an essential authenticity. Part Four focuses on my own performance practice and the proposed value of engaging with a form of practice-led research. This is particularly relevant in relation to critical race studies that require a level of self-reflexivity from the researcher. It presents an analysis of the work entitled Villain (2012) as a disturbance of theatrical desire through a process of ‘becoming’. This notion of meaning and identity as ‘becoming’ is argued as a strategy to challenge prevailing modes of perception which can possibly restore the production of desire to the viewer. The thesis concludes with the notion that performance can offer a mode of immanent ethics which is significant in creating both vulnerable and critical forms of whiteness.
- Full Text:
- Date Issued: 2014
- Authors: Smit, Sonja
- Date: 2014
- Subjects: Performance art -- South Africa , Bailey, Brett, 1967- , Cohen, Steven, 1962- , Antwoord (Musical group) , MacGarry, Michael , Eurocentrism -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2164 , http://hdl.handle.net/10962/d1016358
- Description: The central argument of this thesis asserts that in the process of challenging dominant subject positions, such as whiteness, performance creates the possibilities for new or alternative arrangements of desire. It examines how the creative process of desire is forestalled (reified) by habitual representations of whiteness as a privileged position, and proposes that performance can be a valid form of resistance to static conceptions of race and subjectivity. The discussion takes into account how the privilege of whiteness finds representation through forms of neo-liberalism and neo-colonialism in the post apartheid context. The analysis focuses on the work of white South African artists whose work offers a critique from within the privileged “centre” of whiteness. The research is situated within the inter-disciplinary field of performance studies entailing a reading and application of critical texts to the analysis. Alongside this qualitative methodology surfaces a subjective dialogue with the information presented on whiteness. Part Two includes an analysis of Steven Cohen’s The Cradle of Humankind (2011), Brett Bailey’s Exhibit A (2011) and Michael MacGarry’s LHR-JNB (2010). Each section examines the way in which the respective works engage in a questioning of whiteness through performance. Part Three investigates South African rap-rave duo, Die Antwoord and how their appropriation of Zef interrogates desires for an essential authenticity. Part Four focuses on my own performance practice and the proposed value of engaging with a form of practice-led research. This is particularly relevant in relation to critical race studies that require a level of self-reflexivity from the researcher. It presents an analysis of the work entitled Villain (2012) as a disturbance of theatrical desire through a process of ‘becoming’. This notion of meaning and identity as ‘becoming’ is argued as a strategy to challenge prevailing modes of perception which can possibly restore the production of desire to the viewer. The thesis concludes with the notion that performance can offer a mode of immanent ethics which is significant in creating both vulnerable and critical forms of whiteness.
- Full Text:
- Date Issued: 2014
Challenging hegemony? : a provincial perspective on the limits of policy challenge in the South African state
- Authors: Reynolds, John
- Date: 2014 , 2014-06-24
- Subjects: Community development -- South Africa -- Eastern Cape , South Africa -- Politics and government -- 1994-
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3372 , http://hdl.handle.net/10962/d1013031
- Description: This thesis provides a provincial perspective on the limits of policy challenge within the post-apartheid South African state. This perspective is located in the Eastern Cape Province of South Africa, which is one of the poorest of the nine provinces into which the national territory was divided during the constitutional negotiations prior to the landmark democratic elections of 1994. The empirical foundation for this perspective is an analysis of the process of developing the Eastern Cape Provincial Growth and Development Plan 2004-2014 (PGDP), which took place in 2002-2004. Starting with a broader theoretical discussion, followed by a brief contextual analysis of the South African economy, the structure of the post-apartheid South African state, and key growth and development policies, the more detailed engagement with the PGDP process is undertaken. Drawing on Jessop’s (2008) strategic-relational approach, this thesis argues that the PGDP process arose within a particular spatio-temporal context where new opportunities for policy challenge were possible, but that such challenge had to be negotiated on a strategically selective terrain on which that challenge was neutralised. The PGDP process unfolded as a complex dialectic of agency and a range of path-dependent institutional processes with varying temporal and spatial horizons (cf. Pierson, 2004, 2005) in which no particular outcomes were guaranteed, but in terms of which some outcomes were more likely than others. Although the organisation of state power was expressed in the content of the PGDP, that power had to be understood as fractured across a range of state and non-state institutions, but with the state as the primary site of the contingent organisation of power. The provincial sphere of government faces particular constraints with the South African state, which has implications for its policy scope and the possibilities of policy challenge, even where wider social support is achieved.
- Full Text:
- Date Issued: 2014
- Authors: Reynolds, John
- Date: 2014 , 2014-06-24
- Subjects: Community development -- South Africa -- Eastern Cape , South Africa -- Politics and government -- 1994-
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3372 , http://hdl.handle.net/10962/d1013031
- Description: This thesis provides a provincial perspective on the limits of policy challenge within the post-apartheid South African state. This perspective is located in the Eastern Cape Province of South Africa, which is one of the poorest of the nine provinces into which the national territory was divided during the constitutional negotiations prior to the landmark democratic elections of 1994. The empirical foundation for this perspective is an analysis of the process of developing the Eastern Cape Provincial Growth and Development Plan 2004-2014 (PGDP), which took place in 2002-2004. Starting with a broader theoretical discussion, followed by a brief contextual analysis of the South African economy, the structure of the post-apartheid South African state, and key growth and development policies, the more detailed engagement with the PGDP process is undertaken. Drawing on Jessop’s (2008) strategic-relational approach, this thesis argues that the PGDP process arose within a particular spatio-temporal context where new opportunities for policy challenge were possible, but that such challenge had to be negotiated on a strategically selective terrain on which that challenge was neutralised. The PGDP process unfolded as a complex dialectic of agency and a range of path-dependent institutional processes with varying temporal and spatial horizons (cf. Pierson, 2004, 2005) in which no particular outcomes were guaranteed, but in terms of which some outcomes were more likely than others. Although the organisation of state power was expressed in the content of the PGDP, that power had to be understood as fractured across a range of state and non-state institutions, but with the state as the primary site of the contingent organisation of power. The provincial sphere of government faces particular constraints with the South African state, which has implications for its policy scope and the possibilities of policy challenge, even where wider social support is achieved.
- Full Text:
- Date Issued: 2014
Change in narrative therapy : a pragmatic hermeneutic case study
- Authors: McLean, Neville Terence
- Date: 2014
- Subjects: Narrative therapy
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3235 , http://hdl.handle.net/10962/d1013164
- Description: The client of this case study was a twenty two year old female in her first year at university. The client had come into therapy because she had felt depressed, lonely and riddled with selfdoubt. The author used a Narrative Therapy approach with the client and was focussed on helping the client generate new meanings and stories that were more useful and empowering for the client. In this case study, the author was interested in exploring the process of change that the client underwent during the therapy process and he would rely on identifying innovative moments to track these changes. This interest informed the research question; what is the process of change in narrative therapy as tracked through the therapeutic dialogue? How does the change process in this case study track with the heuristic model of change put forward by Gonçalves and his colleagues? The author chose to use a pragmatic hermeneutic case study method in order to analyse the data and the results were organised into a coherent narrative. The data was collected from twenty two therapy sessions and these were grouped together into themes, namely a quick start, the beginning of change, thickening the innovative moments and lighting the fire. The results of this study reveal that despite being considered a good outcome case by the author, the process of change differed somewhat to that proposed by the heuristic model of change.
- Full Text:
- Date Issued: 2014
- Authors: McLean, Neville Terence
- Date: 2014
- Subjects: Narrative therapy
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3235 , http://hdl.handle.net/10962/d1013164
- Description: The client of this case study was a twenty two year old female in her first year at university. The client had come into therapy because she had felt depressed, lonely and riddled with selfdoubt. The author used a Narrative Therapy approach with the client and was focussed on helping the client generate new meanings and stories that were more useful and empowering for the client. In this case study, the author was interested in exploring the process of change that the client underwent during the therapy process and he would rely on identifying innovative moments to track these changes. This interest informed the research question; what is the process of change in narrative therapy as tracked through the therapeutic dialogue? How does the change process in this case study track with the heuristic model of change put forward by Gonçalves and his colleagues? The author chose to use a pragmatic hermeneutic case study method in order to analyse the data and the results were organised into a coherent narrative. The data was collected from twenty two therapy sessions and these were grouped together into themes, namely a quick start, the beginning of change, thickening the innovative moments and lighting the fire. The results of this study reveal that despite being considered a good outcome case by the author, the process of change differed somewhat to that proposed by the heuristic model of change.
- Full Text:
- Date Issued: 2014
Changes and continuities in the labour process on commercial farms in post-Apartheid South Africa : studies from Eastern Cape and KwaZulu-Natal Provinces
- Authors: Kheswa, Nomzamo Sybil
- Date: 2014
- Subjects: Agricultural laborers -- South Africa -- Eastern Cape , Agricultural laborers -- South Africa -- KwaZulu-Natal , Agricultural wages -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- KwaZulu-Natal , Eastern Cape (South Africa) -- Rural conditions , KwaZulu-Natal (South Africa) -- Rural conditions , Agricultural laborers -- South Africa -- Eastern Cape -- Social conditions , Agricultural laborers -- South Africa -- KwaZulu-Natal -- Social conditions , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- KwaZulu-Natal , Apartheid -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3366 , http://hdl.handle.net/10962/d1011978 , Agricultural laborers -- South Africa -- Eastern Cape , Agricultural laborers -- South Africa -- KwaZulu-Natal , Agricultural wages -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- KwaZulu-Natal , Eastern Cape (South Africa) -- Rural conditions , KwaZulu-Natal (South Africa) -- Rural conditions , Agricultural laborers -- South Africa -- Eastern Cape -- Social conditions , Agricultural laborers -- South Africa -- KwaZulu-Natal -- Social conditions , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- KwaZulu-Natal , Apartheid -- South Africa
- Description: This thesis examines the agricultural labour process on commercial farms in post-apartheid South Africa with a particular focus on systems of labour control on these farms. Considerable literature exists about the labour process in capitalist society but the capitalist labour process does not exist in any pure form. Rather, different labour processes exist and the specific form they take depends on spatial and temporal conditions. Additionally, labour processes are often economic sector-specific. Because of variation in capitalist labour processes, differences in systems of labour control (or labour control regimes) also arise. Historically, up until the end of apartheid in 1994, the labour control regime on commercial farms in South Africa was marked by a paternalistic despotism of a racialised kind. This in part reflected the fact that commercial farms were simultaneously sites of both economic production and social reproduction and, further, they were very privatised agrarian spaces largely unregulated (specifically with regard to labour) by the state. Since the end of apartheid, commercial farms have been subjected to multiple pressures. Notably, the South African state has strongly intervened in labour relations on commercial farms, and commercial farms have been subjected to ongoing neo-liberal restructuring. This has led to the prospects of changes in the prevailing labour control system on commercial farms. In this context, the thesis pursues the following key objective: to understand changes and continuities in the labour process on commercial farms – and particularly labour control systems – subsequent to the end of apartheid in South Africa. It does so with reference to four farms in Eastern Cape and KwaZulu-Natal Provinces.
- Full Text:
- Date Issued: 2014
- Authors: Kheswa, Nomzamo Sybil
- Date: 2014
- Subjects: Agricultural laborers -- South Africa -- Eastern Cape , Agricultural laborers -- South Africa -- KwaZulu-Natal , Agricultural wages -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- KwaZulu-Natal , Eastern Cape (South Africa) -- Rural conditions , KwaZulu-Natal (South Africa) -- Rural conditions , Agricultural laborers -- South Africa -- Eastern Cape -- Social conditions , Agricultural laborers -- South Africa -- KwaZulu-Natal -- Social conditions , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- KwaZulu-Natal , Apartheid -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3366 , http://hdl.handle.net/10962/d1011978 , Agricultural laborers -- South Africa -- Eastern Cape , Agricultural laborers -- South Africa -- KwaZulu-Natal , Agricultural wages -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- KwaZulu-Natal , Eastern Cape (South Africa) -- Rural conditions , KwaZulu-Natal (South Africa) -- Rural conditions , Agricultural laborers -- South Africa -- Eastern Cape -- Social conditions , Agricultural laborers -- South Africa -- KwaZulu-Natal -- Social conditions , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- KwaZulu-Natal , Apartheid -- South Africa
- Description: This thesis examines the agricultural labour process on commercial farms in post-apartheid South Africa with a particular focus on systems of labour control on these farms. Considerable literature exists about the labour process in capitalist society but the capitalist labour process does not exist in any pure form. Rather, different labour processes exist and the specific form they take depends on spatial and temporal conditions. Additionally, labour processes are often economic sector-specific. Because of variation in capitalist labour processes, differences in systems of labour control (or labour control regimes) also arise. Historically, up until the end of apartheid in 1994, the labour control regime on commercial farms in South Africa was marked by a paternalistic despotism of a racialised kind. This in part reflected the fact that commercial farms were simultaneously sites of both economic production and social reproduction and, further, they were very privatised agrarian spaces largely unregulated (specifically with regard to labour) by the state. Since the end of apartheid, commercial farms have been subjected to multiple pressures. Notably, the South African state has strongly intervened in labour relations on commercial farms, and commercial farms have been subjected to ongoing neo-liberal restructuring. This has led to the prospects of changes in the prevailing labour control system on commercial farms. In this context, the thesis pursues the following key objective: to understand changes and continuities in the labour process on commercial farms – and particularly labour control systems – subsequent to the end of apartheid in South Africa. It does so with reference to four farms in Eastern Cape and KwaZulu-Natal Provinces.
- Full Text:
- Date Issued: 2014
Changing marriage practices: the case of urban working class in East London, South Africa
- Authors: Stofile, Zimkhitha Sphokazi
- Date: 2014
- Subjects: Marriage -- South Africa -- Eastern Cape , Interpersonal relations
- Language: English
- Type: Thesis , Masters , M Soc Sc (African Studies)
- Identifier: http://hdl.handle.net/10353/1283 , vital:26542 , Marriage -- South Africa -- Eastern Cape , Interpersonal relations
- Description: This research sought to examine changing meaning of marriage and meaning of family among urban working class residing in East London and how their perceptions of marriage have shifted from the orthodox norms. This study was conducted in Amalinda, which is one of the East London suburbs. Interviews were conducted with male and female informants. It is acknowledged in this study that marriage has traditionally been regarded as imperative in both African and Western cultures. However, there have been some drastic changes in the marriage institution in the twenty-first century. This study found out that people have shifted from the orthodox practices of marriage. The traditional culture has been influenced by various factors such as education, globalisation, and urbanisation. Furthermore, there has been a rise in the number of people who cohabit, increase in the age of first marriage, premarital childbearing and there has been a decline in the number of polygamous marriages and arranged marriages and a number of people have no problem with same-sex marriages. Furthermore, financial implications and financial securities play are influences on why some people choose or not choose to marry.
- Full Text:
- Date Issued: 2014
- Authors: Stofile, Zimkhitha Sphokazi
- Date: 2014
- Subjects: Marriage -- South Africa -- Eastern Cape , Interpersonal relations
- Language: English
- Type: Thesis , Masters , M Soc Sc (African Studies)
- Identifier: http://hdl.handle.net/10353/1283 , vital:26542 , Marriage -- South Africa -- Eastern Cape , Interpersonal relations
- Description: This research sought to examine changing meaning of marriage and meaning of family among urban working class residing in East London and how their perceptions of marriage have shifted from the orthodox norms. This study was conducted in Amalinda, which is one of the East London suburbs. Interviews were conducted with male and female informants. It is acknowledged in this study that marriage has traditionally been regarded as imperative in both African and Western cultures. However, there have been some drastic changes in the marriage institution in the twenty-first century. This study found out that people have shifted from the orthodox practices of marriage. The traditional culture has been influenced by various factors such as education, globalisation, and urbanisation. Furthermore, there has been a rise in the number of people who cohabit, increase in the age of first marriage, premarital childbearing and there has been a decline in the number of polygamous marriages and arranged marriages and a number of people have no problem with same-sex marriages. Furthermore, financial implications and financial securities play are influences on why some people choose or not choose to marry.
- Full Text:
- Date Issued: 2014
Characterisation of Young's modulus and loss factor of damping materials
- Authors: Nortemann, Markus
- Date: 2014
- Subjects: Elasticity , Simulation methods , Damping (Mechanics)
- Language: English
- Type: Thesis , Masters , MEngineering (Mechatronics)
- Identifier: vital:9662 , http://hdl.handle.net/10948/d1021036
- Description: Given the importance of simulation techniques in automotive engineering, there is a lack of implementation regarding these techniques in the acoustics of damping materials for air-borne sound. Biot’s calculations have proven its abilities to simulate the acoustic characteristics of these damping materials. However, the characterisation of essential structural parameters, such as Young’s modulus and loss factor, in order to conduct Biot’s calculations have been inconclusive. Thus, the primary research objective of this study is to propose a new measurement system for the structural Biot parameters. After a comprehensive literature review has been undertaken on damping materials, as well as measurement apparatuses for Young’s modulus and loss factor of damping materials, two causes of measurement errors have been identified. Unknown stresses in measurement apparatuses and inhomogeneous, polytrophic and viscoelastic behaviour of specimens. A new measurement system that does not affect the specimens with unknown stresses and accounts for their complex behaviour required investigation. Non-contact ultrasound had been selected as a solution to determine the aforementioned parameters, since these methods do not necessarily touch or compress the specimen, which led to unknown stresses and neglection of the complex specimen behaviour with the aforementioned techniques. Although ultrasound had been used to determine structural parameters on various types of materials, it has never been used to measure soft porous damping materials. In order to find possible solutions, various sources using ultrasonics to investigate struc- tural parameters had been reviewed. In order to calculate structural parameters, the longitudinal and transversal wave velocity inside the specimen had to be determined. The main findings showed that non-contact ultrasound will be able to evaluate the Young’s modulus, loss factor as well as Poisson’s ratio. Consequently, it was shown that longitudinal velocity measurements could be conducted using well known transmission measurements. However, well known approaches would not be sufficient measuring the transversal wave velocity in soft damping materials. This problem was addressed with a special gas to be used, with lower sound speed velocity in the fluid than in the solid. Moreso, a new method determining the transversal wave velocity had been found, as it would enable the use of an even larger range of damping materials, especially ones with heavy frames and lower porosity. It will use refracted waves inside the specimen and the determination of the convertion position of the transversal to the longitudinal wave at the rear specimen surface. At the end of the study, hardware components were selected and a test rig was constructed, which should be able to prove that a determination of structural Biot parameters with non-contact ultrasound is possible with less errors instead of using mechanical transfer function systems. The development of measurement software as well as the testing of the measurement system and its validation was not under investigation in this dissertation. This study has expanded on the body of literature knowledge regarding non-contact ultrasound. Furthermore, a significant contribution has been made towards a new measurement system measuring Young’s modulus and loss factor which circumvents errors in mechanical transfer function systems. This will contribute to more precise simulations of damping materials and damped enclosures, which may ultimately result in enhanced efficiency of damping materials as well as the acoustic packaging of cars.
- Full Text:
- Date Issued: 2014
- Authors: Nortemann, Markus
- Date: 2014
- Subjects: Elasticity , Simulation methods , Damping (Mechanics)
- Language: English
- Type: Thesis , Masters , MEngineering (Mechatronics)
- Identifier: vital:9662 , http://hdl.handle.net/10948/d1021036
- Description: Given the importance of simulation techniques in automotive engineering, there is a lack of implementation regarding these techniques in the acoustics of damping materials for air-borne sound. Biot’s calculations have proven its abilities to simulate the acoustic characteristics of these damping materials. However, the characterisation of essential structural parameters, such as Young’s modulus and loss factor, in order to conduct Biot’s calculations have been inconclusive. Thus, the primary research objective of this study is to propose a new measurement system for the structural Biot parameters. After a comprehensive literature review has been undertaken on damping materials, as well as measurement apparatuses for Young’s modulus and loss factor of damping materials, two causes of measurement errors have been identified. Unknown stresses in measurement apparatuses and inhomogeneous, polytrophic and viscoelastic behaviour of specimens. A new measurement system that does not affect the specimens with unknown stresses and accounts for their complex behaviour required investigation. Non-contact ultrasound had been selected as a solution to determine the aforementioned parameters, since these methods do not necessarily touch or compress the specimen, which led to unknown stresses and neglection of the complex specimen behaviour with the aforementioned techniques. Although ultrasound had been used to determine structural parameters on various types of materials, it has never been used to measure soft porous damping materials. In order to find possible solutions, various sources using ultrasonics to investigate struc- tural parameters had been reviewed. In order to calculate structural parameters, the longitudinal and transversal wave velocity inside the specimen had to be determined. The main findings showed that non-contact ultrasound will be able to evaluate the Young’s modulus, loss factor as well as Poisson’s ratio. Consequently, it was shown that longitudinal velocity measurements could be conducted using well known transmission measurements. However, well known approaches would not be sufficient measuring the transversal wave velocity in soft damping materials. This problem was addressed with a special gas to be used, with lower sound speed velocity in the fluid than in the solid. Moreso, a new method determining the transversal wave velocity had been found, as it would enable the use of an even larger range of damping materials, especially ones with heavy frames and lower porosity. It will use refracted waves inside the specimen and the determination of the convertion position of the transversal to the longitudinal wave at the rear specimen surface. At the end of the study, hardware components were selected and a test rig was constructed, which should be able to prove that a determination of structural Biot parameters with non-contact ultrasound is possible with less errors instead of using mechanical transfer function systems. The development of measurement software as well as the testing of the measurement system and its validation was not under investigation in this dissertation. This study has expanded on the body of literature knowledge regarding non-contact ultrasound. Furthermore, a significant contribution has been made towards a new measurement system measuring Young’s modulus and loss factor which circumvents errors in mechanical transfer function systems. This will contribute to more precise simulations of damping materials and damped enclosures, which may ultimately result in enhanced efficiency of damping materials as well as the acoustic packaging of cars.
- Full Text:
- Date Issued: 2014
Characterization and application of phthalocyanine-magnetic nanoparticle conjugates anchored to electrospun polyamide nanofibers
- Authors: Ledwaba, Mpho
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54610 , vital:26593
- Description: This work presents the syntheses, photophysical and photochemical characterization of zinc tetracarboxyphenoxy phthalocyanine (ZnTCPPc, 3) and its gadolinium oxide nanoparticle conjugate (4). By means of spectroscopic and microscopic characterization, the conjugation of the ZnTCPPc to the silica coated gadolinium oxide nanoparticles (Si-Gd2O3 NPs, 2) through an amide bond was confirmed. The thermal stability, morphology, nanoparticle sizes and their conjugates with the Pc were studied using ThermoGravimetric Analysis (TGA), Fourier Transform Infrared spectroscopy (FTIR), Transmission Electron Microscopy (TEM) and powder X-ray diffractometry (XRD). Conjugation of ZnTCPPc to the magnetic nanoparticles, proved to have a negligible effect on the photophysical parameters of the phthalocyanine, where a slight decrease in fluorescence and triplet quantum yields and lifetimes was observed. The singlet oxygen quantum yield, however, increased slightly upon conjugation, suggesting that the overall efficiency of the ZnTCPPc as a photosensitizer had improved. Physical mixing of the ZnTCPPc and the silica-coated gadolinium nanoparticles also showed an improvement in the singlet oxygen quantum yield and triplet lifetime, also showing an enhanced efficiency for the photosensitizer and therefore photocatalysis. ZnTCPPc (3) alone and the Pc-gadolinium oxide nanoparticle conjugate (4) were therefore electrospun into nanofibers to create a solid support. The fibers were characterized and their diameter sizes and composition was studied confirming the incorporation of the phthalocyanine and gadolinium oxide nanoparticle. Increased singlet oxygen generation resulted in increased Photodegradation of the environmental pollutant Orange G and the fibers were found to be more efficient as photocatalysts compared to the photosensitizer in solution. The nanomaterial may therefore be applied to the photodegradation of Orange G.
- Full Text:
- Date Issued: 2014
- Authors: Ledwaba, Mpho
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54610 , vital:26593
- Description: This work presents the syntheses, photophysical and photochemical characterization of zinc tetracarboxyphenoxy phthalocyanine (ZnTCPPc, 3) and its gadolinium oxide nanoparticle conjugate (4). By means of spectroscopic and microscopic characterization, the conjugation of the ZnTCPPc to the silica coated gadolinium oxide nanoparticles (Si-Gd2O3 NPs, 2) through an amide bond was confirmed. The thermal stability, morphology, nanoparticle sizes and their conjugates with the Pc were studied using ThermoGravimetric Analysis (TGA), Fourier Transform Infrared spectroscopy (FTIR), Transmission Electron Microscopy (TEM) and powder X-ray diffractometry (XRD). Conjugation of ZnTCPPc to the magnetic nanoparticles, proved to have a negligible effect on the photophysical parameters of the phthalocyanine, where a slight decrease in fluorescence and triplet quantum yields and lifetimes was observed. The singlet oxygen quantum yield, however, increased slightly upon conjugation, suggesting that the overall efficiency of the ZnTCPPc as a photosensitizer had improved. Physical mixing of the ZnTCPPc and the silica-coated gadolinium nanoparticles also showed an improvement in the singlet oxygen quantum yield and triplet lifetime, also showing an enhanced efficiency for the photosensitizer and therefore photocatalysis. ZnTCPPc (3) alone and the Pc-gadolinium oxide nanoparticle conjugate (4) were therefore electrospun into nanofibers to create a solid support. The fibers were characterized and their diameter sizes and composition was studied confirming the incorporation of the phthalocyanine and gadolinium oxide nanoparticle. Increased singlet oxygen generation resulted in increased Photodegradation of the environmental pollutant Orange G and the fibers were found to be more efficient as photocatalysts compared to the photosensitizer in solution. The nanomaterial may therefore be applied to the photodegradation of Orange G.
- Full Text:
- Date Issued: 2014
Characterization and computer simulation of corn stover/coal blends for co-gasification in a downdraft gasifier
- Authors: Mabizela, Polycarp Sbusiso
- Date: 2014
- Language: English
- Type: Thesis , Masters , MSc (Physics)
- Identifier: vital:11600 , http://hdl.handle.net/10353/d1020203
- Description: The need for sustainable alternative energy technology is becoming more urgent as the demand for clean energy environment increases. For centuries, electricity in South Africa has been derived mostly from coal with results growing in multifold annually due to concerns about the impact of fossil fuel utilization related to emission of greenhouse gasses. It is practically impossible at the moment to replace coal with biomass resources because of the low energy value of biomass. However, the conversion of coal has experienced some challenges especially during its gasification which includes, but are not limited to a high reaction temperature exceeding 900°C which most gasifiers cannot achieve, and if achieved in most cases, combustion of the resulting syngas usually occur, leading to low conversion efficiency and the risk of reaching extremely high temperatures that may result in pressure build up and explosion may also occur. Therefore, this study sought to investigate the possibility of co-gasifying corn stover with coal with the ultimate aim establishing the best mixing ratio that would result in optimum co-gasification efficiency after computer simulation. Proximate and ultimate analysis, including energy values of corn stover and coal as well as their blends were undertaken and results showed significant differences between the two feedstocks and narrow range composition betwee their blends in terms of properties and energy value. Corn stover showed a higher fraction of volatile matter and lower ash content than coal, whereas those of their blends vary considerably in terms of physical properties. Differences in chemical composition also showed higher fraction of hydrogen and oxygen, and less carbon than coal while those of their blends vary according to the ratio of corn stover to coal and vice versa in the blends. The thermal stability of corn stover and coal as well as their blends were also established and the maximum temperature reached for thermal degradation of their blends was 900°C as depicted by TGA analysis. The SEM results revealed no changes in morphology of the pure samples of corn stover and coal which was due to the fact that a pre-treatment of the samples were not undertaken, whereas the blends showed significant changes in morphology as a result of blending. However, luminous and non-luminous features were noticed in both SEM images of the blends with the 10% coal/90% corn stover blend having higher percentages of luminosity as a result of higher quantities of coal in the blend. The energy density of the samples were also measured and found to be 16.1 MJ/kg and 22.8 MJ/kg for corn stover and coal respectively. Those of their blends varied from 16.9 to approximately 23.5 MJ/kg. These results were used to conduct computer simulation of the co-gasification process in order to establish the best blend that would result in maximum co-gasification efficiency. The blend 90% corn stover/10% coal was found to be the most suitable blend for co-gasification resulting in an efficiency of approximately 58% because its conversion was efficiently achieved at a temperature that is intermediate to that of coal and biomass independently. The simulation results were, however, compared with experimental data found in the literature and results showed only slight variation between them.
- Full Text:
- Date Issued: 2014
- Authors: Mabizela, Polycarp Sbusiso
- Date: 2014
- Language: English
- Type: Thesis , Masters , MSc (Physics)
- Identifier: vital:11600 , http://hdl.handle.net/10353/d1020203
- Description: The need for sustainable alternative energy technology is becoming more urgent as the demand for clean energy environment increases. For centuries, electricity in South Africa has been derived mostly from coal with results growing in multifold annually due to concerns about the impact of fossil fuel utilization related to emission of greenhouse gasses. It is practically impossible at the moment to replace coal with biomass resources because of the low energy value of biomass. However, the conversion of coal has experienced some challenges especially during its gasification which includes, but are not limited to a high reaction temperature exceeding 900°C which most gasifiers cannot achieve, and if achieved in most cases, combustion of the resulting syngas usually occur, leading to low conversion efficiency and the risk of reaching extremely high temperatures that may result in pressure build up and explosion may also occur. Therefore, this study sought to investigate the possibility of co-gasifying corn stover with coal with the ultimate aim establishing the best mixing ratio that would result in optimum co-gasification efficiency after computer simulation. Proximate and ultimate analysis, including energy values of corn stover and coal as well as their blends were undertaken and results showed significant differences between the two feedstocks and narrow range composition betwee their blends in terms of properties and energy value. Corn stover showed a higher fraction of volatile matter and lower ash content than coal, whereas those of their blends vary considerably in terms of physical properties. Differences in chemical composition also showed higher fraction of hydrogen and oxygen, and less carbon than coal while those of their blends vary according to the ratio of corn stover to coal and vice versa in the blends. The thermal stability of corn stover and coal as well as their blends were also established and the maximum temperature reached for thermal degradation of their blends was 900°C as depicted by TGA analysis. The SEM results revealed no changes in morphology of the pure samples of corn stover and coal which was due to the fact that a pre-treatment of the samples were not undertaken, whereas the blends showed significant changes in morphology as a result of blending. However, luminous and non-luminous features were noticed in both SEM images of the blends with the 10% coal/90% corn stover blend having higher percentages of luminosity as a result of higher quantities of coal in the blend. The energy density of the samples were also measured and found to be 16.1 MJ/kg and 22.8 MJ/kg for corn stover and coal respectively. Those of their blends varied from 16.9 to approximately 23.5 MJ/kg. These results were used to conduct computer simulation of the co-gasification process in order to establish the best blend that would result in maximum co-gasification efficiency. The blend 90% corn stover/10% coal was found to be the most suitable blend for co-gasification resulting in an efficiency of approximately 58% because its conversion was efficiently achieved at a temperature that is intermediate to that of coal and biomass independently. The simulation results were, however, compared with experimental data found in the literature and results showed only slight variation between them.
- Full Text:
- Date Issued: 2014
Characterization of animal fibres
- Authors: Notayi, Mzwamadoda
- Date: 2014
- Subjects: Animal fibres , Textile fabrics , Animal science
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10552 , http://hdl.handle.net/10948/d1020426
- Description: Identification of fibres, particularly in blends, requires knowledge of their characteristics. Individual Identifying features between wool and mohair fibres were investigated in this study using a Scanning Electron Microscope (SEM), Fourier Transform Infrared-Attenuated Total Reflection (FTIR-ATR), Fourier Transform Raman and Atomic Force Microscope (AFM). This study confirmed that wool and mohair can be differentiated and identified in blends using the cuticle scale height (CSH) criterion, wool having an average CSH of 0.6 ± 0.1 μm and mohair having an average CSH of 0.4 ± 0.1 μm. The AFM provided highly reproducible CSH results, which also confirmed the SEM results that indeed wool and mohair could be differentiated using the CSH as criterion. The AFM gave a CSH value of 0.9 ± 0.2 μm for wool and 0.6 ± 0.2 μm for mohair, the difference between the two results being statistically significant according to the student t-test. It has been demonstrated that wool and mohair identification in blends is possible, by using the AFM to measure CSH, although the method is very time consuming and might be expensive. The FTIR-ATR showed similar spectra for wool and mohair fibres, confirming that the two fibre types consist of the same polymer material. Nevertheless, a difference was observed in the ratios of the relative intensities of the amide I (around 1630 cm-1) to the amide II (around 1515cm-1) absorption bands. The FT Raman provided similar spectra for the wool and mohair fibres, although a possible distinguishing feature between the two fibres could be the intensities of the alkyl side chains chemical band near 2940 cm-1 in the spectra of the two fibre types. According to the results obtained in this study, the FTIR-ATR and the FT Raman techniques may have potential for differentiating between wool and mohair but this requires further investigation.
- Full Text:
- Date Issued: 2014
- Authors: Notayi, Mzwamadoda
- Date: 2014
- Subjects: Animal fibres , Textile fabrics , Animal science
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10552 , http://hdl.handle.net/10948/d1020426
- Description: Identification of fibres, particularly in blends, requires knowledge of their characteristics. Individual Identifying features between wool and mohair fibres were investigated in this study using a Scanning Electron Microscope (SEM), Fourier Transform Infrared-Attenuated Total Reflection (FTIR-ATR), Fourier Transform Raman and Atomic Force Microscope (AFM). This study confirmed that wool and mohair can be differentiated and identified in blends using the cuticle scale height (CSH) criterion, wool having an average CSH of 0.6 ± 0.1 μm and mohair having an average CSH of 0.4 ± 0.1 μm. The AFM provided highly reproducible CSH results, which also confirmed the SEM results that indeed wool and mohair could be differentiated using the CSH as criterion. The AFM gave a CSH value of 0.9 ± 0.2 μm for wool and 0.6 ± 0.2 μm for mohair, the difference between the two results being statistically significant according to the student t-test. It has been demonstrated that wool and mohair identification in blends is possible, by using the AFM to measure CSH, although the method is very time consuming and might be expensive. The FTIR-ATR showed similar spectra for wool and mohair fibres, confirming that the two fibre types consist of the same polymer material. Nevertheless, a difference was observed in the ratios of the relative intensities of the amide I (around 1630 cm-1) to the amide II (around 1515cm-1) absorption bands. The FT Raman provided similar spectra for the wool and mohair fibres, although a possible distinguishing feature between the two fibres could be the intensities of the alkyl side chains chemical band near 2940 cm-1 in the spectra of the two fibre types. According to the results obtained in this study, the FTIR-ATR and the FT Raman techniques may have potential for differentiating between wool and mohair but this requires further investigation.
- Full Text:
- Date Issued: 2014
Characterization of chromatic dispersion in single mode fibre
- Authors: Wassin, Shukree
- Date: 2014
- Subjects: Fiber optics Electromagnetic waves , Electromagnetic waves -- Transmission
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/47807 , vital:40379
- Description: In this dissertation, an investigation of chromatic dispersion is presented. The Pulse delay and phase Shift chromatic dispersion characterization techniques were used for conducting the measurements. The experiments were performed in a modern optical fibre research laboratory and chromatic dispersion measurements were carried out on several lengths of G.652 and G.655 single mode fibres. The pulse delay characterization technique measures the time of flight between two modulated optical signals whilst propagating along the fibre under test. During phase shift experiments, the group delay is obtained by measuring the relative phase difference as a function of wavelength, between adjacent sinusoidal light signals. The pulse delay and phase shift characterization techniques illustrated excellent agreement in the measured! chromatic Dispersion coefficients along the G.652 standard single mode! fibre as well as the G.655 positive and negative non-zero dispersion shifted fibre. It was found that the measurement accuracy improved as the fibre length increased. A periodic shift between the modulated optical signals, propagating along the fibre was experimentally observed. It is to be remarked that the longer wavelength signals propagated faster along the G.655 positive non-zero dispersion shifted fibre in comparison to its transmission within the G.655 negative non-zero dispersion shifted fibre. Furthermore, it was found that the sinusoidal signal shifted towards the left along the G.655 negative NZDSF fibre whilst the shift occurred towards the right along the G.655 positive NZDSF fibre. Generally, the shift arising along the G.655 fibres was found to be smaller than the shift seen throughout the G.652 fibres. Towards the end of this study, a chromatic dispersion compensation system was designed and tested. Once characterization of the compensation link was completed, it was experimentally illustrated that the chromatic dispersion across the system was successfully reduced. Finally, a sum of squares of error statistical test showed that the phase shift technique is more accurate in comparison to the pulse delay method. This result was found to be in good agreement with published work found in literature.
- Full Text:
- Date Issued: 2014
- Authors: Wassin, Shukree
- Date: 2014
- Subjects: Fiber optics Electromagnetic waves , Electromagnetic waves -- Transmission
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/47807 , vital:40379
- Description: In this dissertation, an investigation of chromatic dispersion is presented. The Pulse delay and phase Shift chromatic dispersion characterization techniques were used for conducting the measurements. The experiments were performed in a modern optical fibre research laboratory and chromatic dispersion measurements were carried out on several lengths of G.652 and G.655 single mode fibres. The pulse delay characterization technique measures the time of flight between two modulated optical signals whilst propagating along the fibre under test. During phase shift experiments, the group delay is obtained by measuring the relative phase difference as a function of wavelength, between adjacent sinusoidal light signals. The pulse delay and phase shift characterization techniques illustrated excellent agreement in the measured! chromatic Dispersion coefficients along the G.652 standard single mode! fibre as well as the G.655 positive and negative non-zero dispersion shifted fibre. It was found that the measurement accuracy improved as the fibre length increased. A periodic shift between the modulated optical signals, propagating along the fibre was experimentally observed. It is to be remarked that the longer wavelength signals propagated faster along the G.655 positive non-zero dispersion shifted fibre in comparison to its transmission within the G.655 negative non-zero dispersion shifted fibre. Furthermore, it was found that the sinusoidal signal shifted towards the left along the G.655 negative NZDSF fibre whilst the shift occurred towards the right along the G.655 positive NZDSF fibre. Generally, the shift arising along the G.655 fibres was found to be smaller than the shift seen throughout the G.652 fibres. Towards the end of this study, a chromatic dispersion compensation system was designed and tested. Once characterization of the compensation link was completed, it was experimentally illustrated that the chromatic dispersion across the system was successfully reduced. Finally, a sum of squares of error statistical test showed that the phase shift technique is more accurate in comparison to the pulse delay method. This result was found to be in good agreement with published work found in literature.
- Full Text:
- Date Issued: 2014
Characterization of electrodes modified by one pot or step by step electro-click reaction and axial ligation of iron tetracarboxyphthalocyanine
- Maringa, Audacity, Mashazi, Philani N, Nyokong, Tebello
- Authors: Maringa, Audacity , Mashazi, Philani N , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193892 , vital:45403 , xlink:href="https://doi.org/10.1016/j.electacta.2014.09.011"
- Description: The modification of the glassy carbon electrode (GCE) was carried out using two methods. The first method is simultaneous electropolymerization and electro-click followed by immersion into a solution of dimethyl formamide (DMF) containing FeTCPc. The second method is step by step whereby electropolymerization is carried out first followed by electro-click and then immersion into a DMF solution containing FeTCPc. From the electrochemical characterization, it was observed that the second route (step by step method) was the best as indicated by the ferricyanide studies (cyclic voltammetry and scanning electrochemical microscopy). In the electrooxidation of hydrazine, we obtained a potential of 0.26 V. Of interest were the detection limit of 6.4 μM and the catalytic rate constant of 2.1 × 109 cm3 mol−1 s−1. This shows that the sensor can be used for the electrooxidation of hydrazine.
- Full Text:
- Date Issued: 2014
- Authors: Maringa, Audacity , Mashazi, Philani N , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193892 , vital:45403 , xlink:href="https://doi.org/10.1016/j.electacta.2014.09.011"
- Description: The modification of the glassy carbon electrode (GCE) was carried out using two methods. The first method is simultaneous electropolymerization and electro-click followed by immersion into a solution of dimethyl formamide (DMF) containing FeTCPc. The second method is step by step whereby electropolymerization is carried out first followed by electro-click and then immersion into a DMF solution containing FeTCPc. From the electrochemical characterization, it was observed that the second route (step by step method) was the best as indicated by the ferricyanide studies (cyclic voltammetry and scanning electrochemical microscopy). In the electrooxidation of hydrazine, we obtained a potential of 0.26 V. Of interest were the detection limit of 6.4 μM and the catalytic rate constant of 2.1 × 109 cm3 mol−1 s−1. This shows that the sensor can be used for the electrooxidation of hydrazine.
- Full Text:
- Date Issued: 2014
Characterization of the Hsp40 partner proteins of Plasmodium falciparum Hsp70
- Authors: Njunge, James Mwangi
- Date: 2014
- Subjects: Plasmodium falciparum , Heat shock proteins , Malaria -- Chemotherapy , Protein-protein interactions , Erythrocytes -- Biotechnology , Molecular chaperones , Host-parasite relationships , Mitochondria
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4117 , http://hdl.handle.net/10962/d1013186
- Description: Human malaria is an economically important disease caused by single-celled parasites of the Plasmodium genus whose biology displays great evolutionary adaptation to both its mammalian host and transmitting vectors. This thesis details the 70 kDa heat shock protein (Hsp70) and J protein chaperone complements in malaria parasites affecting humans, primates and rodents. Heat shock proteins comprise a family of evolutionary conserved and structurally related proteins that play a crucial role in maintaining the structural integrity of proteins during normal and stress conditions. They are considered future therapeutic targets in various cellular systems including Plasmodium falciparum. J proteins (Hsp40) canonically partner with Hsp70s during protein synthesis and folding, trafficking or targeting of proteins for degradation. However, in P. falciparum, these classes of proteins have also been implicated in aiding the active transport of parasite proteins to the erythrocyte cytosol following erythrocyte entry by the parasite. This host-parasite “cross-talk” results in tremendous modifications of the infected erythrocyte, imparting properties that allow it to adhere to the endothelium, preventing splenic clearance. The genome of P. falciparum encodes six Hsp70 homologues and a large number of J proteins that localize to the various intracellular compartments or are exported to the infected erythrocyte cytosol. Understanding the Hsp70-J protein interactions and/or partnerships is an essential step for drug target validation and illumination of parasite biology. A review of these chaperone complements across the Plasmodium species shows that P. falciparum possesses an expanded Hsp70-J protein complement compared to the rodent and primate infecting species. It further highlights how unique the P. falciparum chaperone complement is compared to the other Plasmodium species included in the analysis. In silico analysis showed that the genome of P. falciparum encodes approximately 49 J proteins, 19 of which contain a PEXEL motif that has been implicated in routing proteins to the infected erythrocyte. Most of these PEXEL containing J proteins are unique with no homologues in the human system and are considered as attractive drug targets. Very few of the predicted J proteins in P. falciparum have been experimentally characterized. To this end, cell biological and biochemical approaches were employed to characterize PFB0595w and PFD0462w (Pfj1) J proteins. The uniqueness of Pfj1 and the controversy in literature regarding its localization formed the basis for the experimental work. This is the first study showing that Pfj1 localizes to the mitochondrion in the intraerythrocytic stage of development of P. falciparum and has further proposed PfHsp70-3 as a potential Hsp70 partner. Indeed, attempts to heterologously express and purify Pfj1 for its characterization are described. It is also the first study that details the successful expression and purification of PfHsp70-3. Further, research findings have described for the first time the expression and localization of PFB0595w in the intraerythrocytic stages of P. falciparum development. Based on the cytosolic localization of both PFB0595w and PfHsp70-1, a chaperone – cochaperone partnership was proposed that formed the basis for the in vitro experiments. PFB0595w was shown for the first time to stimulate the ATPase activity of PfHsp70-1 pointing to a functional interaction. Preliminary surface plasmon spectroscopy analysis has revealed a potential interaction between PFB0595w and PfHsp70-1 but highlights the need for further related experiments to support the findings. Gel filtration analysis showed that PFB0595w exists as a dimer thereby confirming in silico predictions. Based on these observations, we conclude that PFB0595w may regulate the chaperone activity of PfHsp70-1 in the cytosol while Pfj1 may play a co-chaperoning role for PfHsp70-3 in the mitochondrion. Overall, this data is expected to increase the knowledge of the Hsp70-J protein partnerships in the erythrocytic stage of P. falciparum development, thereby enhancing the understanding of parasite biology.
- Full Text:
- Date Issued: 2014
- Authors: Njunge, James Mwangi
- Date: 2014
- Subjects: Plasmodium falciparum , Heat shock proteins , Malaria -- Chemotherapy , Protein-protein interactions , Erythrocytes -- Biotechnology , Molecular chaperones , Host-parasite relationships , Mitochondria
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4117 , http://hdl.handle.net/10962/d1013186
- Description: Human malaria is an economically important disease caused by single-celled parasites of the Plasmodium genus whose biology displays great evolutionary adaptation to both its mammalian host and transmitting vectors. This thesis details the 70 kDa heat shock protein (Hsp70) and J protein chaperone complements in malaria parasites affecting humans, primates and rodents. Heat shock proteins comprise a family of evolutionary conserved and structurally related proteins that play a crucial role in maintaining the structural integrity of proteins during normal and stress conditions. They are considered future therapeutic targets in various cellular systems including Plasmodium falciparum. J proteins (Hsp40) canonically partner with Hsp70s during protein synthesis and folding, trafficking or targeting of proteins for degradation. However, in P. falciparum, these classes of proteins have also been implicated in aiding the active transport of parasite proteins to the erythrocyte cytosol following erythrocyte entry by the parasite. This host-parasite “cross-talk” results in tremendous modifications of the infected erythrocyte, imparting properties that allow it to adhere to the endothelium, preventing splenic clearance. The genome of P. falciparum encodes six Hsp70 homologues and a large number of J proteins that localize to the various intracellular compartments or are exported to the infected erythrocyte cytosol. Understanding the Hsp70-J protein interactions and/or partnerships is an essential step for drug target validation and illumination of parasite biology. A review of these chaperone complements across the Plasmodium species shows that P. falciparum possesses an expanded Hsp70-J protein complement compared to the rodent and primate infecting species. It further highlights how unique the P. falciparum chaperone complement is compared to the other Plasmodium species included in the analysis. In silico analysis showed that the genome of P. falciparum encodes approximately 49 J proteins, 19 of which contain a PEXEL motif that has been implicated in routing proteins to the infected erythrocyte. Most of these PEXEL containing J proteins are unique with no homologues in the human system and are considered as attractive drug targets. Very few of the predicted J proteins in P. falciparum have been experimentally characterized. To this end, cell biological and biochemical approaches were employed to characterize PFB0595w and PFD0462w (Pfj1) J proteins. The uniqueness of Pfj1 and the controversy in literature regarding its localization formed the basis for the experimental work. This is the first study showing that Pfj1 localizes to the mitochondrion in the intraerythrocytic stage of development of P. falciparum and has further proposed PfHsp70-3 as a potential Hsp70 partner. Indeed, attempts to heterologously express and purify Pfj1 for its characterization are described. It is also the first study that details the successful expression and purification of PfHsp70-3. Further, research findings have described for the first time the expression and localization of PFB0595w in the intraerythrocytic stages of P. falciparum development. Based on the cytosolic localization of both PFB0595w and PfHsp70-1, a chaperone – cochaperone partnership was proposed that formed the basis for the in vitro experiments. PFB0595w was shown for the first time to stimulate the ATPase activity of PfHsp70-1 pointing to a functional interaction. Preliminary surface plasmon spectroscopy analysis has revealed a potential interaction between PFB0595w and PfHsp70-1 but highlights the need for further related experiments to support the findings. Gel filtration analysis showed that PFB0595w exists as a dimer thereby confirming in silico predictions. Based on these observations, we conclude that PFB0595w may regulate the chaperone activity of PfHsp70-1 in the cytosol while Pfj1 may play a co-chaperoning role for PfHsp70-3 in the mitochondrion. Overall, this data is expected to increase the knowledge of the Hsp70-J protein partnerships in the erythrocytic stage of P. falciparum development, thereby enhancing the understanding of parasite biology.
- Full Text:
- Date Issued: 2014
Child justice: an analysis of the development of child justice reform in Botswana
- Isaacs, Nthabiseng Rosalind Bertha
- Authors: Isaacs, Nthabiseng Rosalind Bertha
- Date: 2014
- Subjects: Juvenile justice, Administration of -- Botswana , Criminals -- Rehabilitation -- Botswana , Children's rights -- Botswana
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10184 , http://hdl.handle.net/10948/d1020094
- Description: This dissertation addresses the developments of child justice in Botswana. The first ever child justice that was established is discussed with the aim to understand the influence it had on Botswana with regard to the nature of the proceedings and the founding principles of child justice and its application in the courts. International Conventions that have a bearing on the rights of children in Botswana, such as the Convention on the Rights of the Child, the United Nations Standard Minimum Rules for the Administration of Juvenile Justice, the United Nations Rules for the Protection of Juveniles Deprived of their Liberty, the United Nations Guidelines for the Prevention of Juvenile Delinquency and the African Charter on the Rights and Welfare of the Child are discussed. The measures that are currently in place for the protection of children who are in conflict with the law are examined with particular emphasis on those children that are arrested and detained. A comparison is drawn between the Children’s Act CAP [28:04] OF 1981, the Children’s Act 8 of 2009 and the South African Child Justice Act 75 of 2008 and the differences between the systems are highlighted. The provisions of the 2009 Act pertaining to children in conflict with the law are discussed in depth and shortfalls of the 2009 Children’s Act are identified. Diversion, as a form of correctional action, is discussed in light of international conventions. The provisions regarding the diversion of child offenders in the Child Justice Act are interrogated. Trial procedures under the 2009 Children’s Act are discussed and compared to those in South Africa including measures in place for the sentencing child offenders in both Botswana and South Africa. After an analysis of the international conventions, legislation and case law, the conclusion is reached that there is a commitment in Botswana towards the protectionand realization of children’s rights especially those who are in conflict with the law. It is recommended in the conclusions that Botswana import some provisions of the Child Justice Act into domestic legislation in order to comprehensively address the plight of children in trouble with the law so as to strive towards maximum compliance with conventions that Botswana has signed.
- Full Text:
- Date Issued: 2014
- Authors: Isaacs, Nthabiseng Rosalind Bertha
- Date: 2014
- Subjects: Juvenile justice, Administration of -- Botswana , Criminals -- Rehabilitation -- Botswana , Children's rights -- Botswana
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10184 , http://hdl.handle.net/10948/d1020094
- Description: This dissertation addresses the developments of child justice in Botswana. The first ever child justice that was established is discussed with the aim to understand the influence it had on Botswana with regard to the nature of the proceedings and the founding principles of child justice and its application in the courts. International Conventions that have a bearing on the rights of children in Botswana, such as the Convention on the Rights of the Child, the United Nations Standard Minimum Rules for the Administration of Juvenile Justice, the United Nations Rules for the Protection of Juveniles Deprived of their Liberty, the United Nations Guidelines for the Prevention of Juvenile Delinquency and the African Charter on the Rights and Welfare of the Child are discussed. The measures that are currently in place for the protection of children who are in conflict with the law are examined with particular emphasis on those children that are arrested and detained. A comparison is drawn between the Children’s Act CAP [28:04] OF 1981, the Children’s Act 8 of 2009 and the South African Child Justice Act 75 of 2008 and the differences between the systems are highlighted. The provisions of the 2009 Act pertaining to children in conflict with the law are discussed in depth and shortfalls of the 2009 Children’s Act are identified. Diversion, as a form of correctional action, is discussed in light of international conventions. The provisions regarding the diversion of child offenders in the Child Justice Act are interrogated. Trial procedures under the 2009 Children’s Act are discussed and compared to those in South Africa including measures in place for the sentencing child offenders in both Botswana and South Africa. After an analysis of the international conventions, legislation and case law, the conclusion is reached that there is a commitment in Botswana towards the protectionand realization of children’s rights especially those who are in conflict with the law. It is recommended in the conclusions that Botswana import some provisions of the Child Justice Act into domestic legislation in order to comprehensively address the plight of children in trouble with the law so as to strive towards maximum compliance with conventions that Botswana has signed.
- Full Text:
- Date Issued: 2014
Chinese tourists' intentions to visit South Africa: an extended model of the theory of planned behaviour
- Authors: Han, Xiliang
- Date: 2014
- Subjects: Market segmentation , Tourists -- Attitudes , Sustainable tourism -- South Africa
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9325 , http://hdl.handle.net/10948/d1020945
- Description: The South African National Department of Tourism has recently initiated the National Tourism Sector Strategy aimed at developing a sustainable tourism economy, and making the country a Top 20 global tourism destination by 2020.China is one of South Africa’s major non-African sources of tourist arrivals. To ensure a growing share of this booming market, South African tourism scholars and practitioners have to pay close attention to the behaviour of Chinese outbound tourists, particularly their destination choice behaviour. The Theory of Planned Behaviour (TPB)– an extension of the Theory of Reasoned Action (TRA)– can serve as a basis for researching destination choice. According to the TPB literature, intention is the most immediate and important determinant of behaviour. Three direct predictors of intention, namely, attitude, subjective norms, and perceived control, are functions of latent behavioural, normative, and control beliefs, respectively. The TPB is parsimonious but open to the inclusion of additional predictors if there is evidence that these predictors may explain a significant proportion of the variance in intention and behaviour after the basic predictors (attitude, subjective norms, and perceived control) have been accounted for. The current research successfully extended the TPB model for predicting potential Chinese tourists’ intentions to visit South Africa by adding two additional variables: travel motivation and travel constraints. The push-pull motivation framework discussed in the study postulates that people travel because they are pushed by internal forces (inner needs) and pulled by external forces (destination attributes). Typical barriers to travel include intrapersonal, interpersonal, and structural constraints. The new model makes an important contribution to the literature on destination choice, and provides South Africa’s destination marketers with suggestions for attracting and serving Chinese tourists. In addition, the research shows that both travel motivation and travel constraints can be used as bases for segmenting the outbound Chinese tourist market interested in visiting South Africa. A survey approach and a structured questionnaire distributed electronically to the online panel members of a Chinese market research company were instrumental in collecting the empirical data for the study. The questionnaire was originally written in English and translated into Chinese (Mandarin) via a blind translation-back-translation method. Attitude, subjective norms, perceived control, and visit intention were all operationalised as unidimensional and used scales adapted from previous studies. New scales were developed for travel motivation and travel constraints– both operationalised as multidimensional. Quota sampling, used to identify respondents aged 18 or older and living in Beijing, Shanghai, and Guangzhou, resulted in 630 usable questionnaires obtained from 1,510 sent invitation e-mails, yielding a response rate of 41.7%. The raw data collected were prepared through the sequential steps of editing, coding, and filing, and then analysed using both descriptive and inferential statistics. Descriptive analysis suggested that broadening personal horizons, viewing the natural scenery, and seeing something different were the top motives for visiting South Africa, while language, fear of crime, and lack of travel companions were the top barriers to visiting South Africa. According to the factor analysis, travel motivation had three underlying dimensions – learning, escape, and aesthetics and appreciation, while operational, risk and fear, and social barriers were three underlying dimensions of travel constraints. Regression analysis showed that the proposed extended TPB model had higher predictive power for visit intention than both TRA and TPB models; the basic predictors – attitude, subjective norms, and perceived control – all had a significant impact on visit intention; and in terms of the additional predictors, learning, operational constraints, and social constraints had a significant impact on visit intention. The analysis of variance indicated that travel frequency and age were the most profound background factors with an influence on the extended TPB model. Finally, cluster analysis resulted in two market segments with distinct profiles, that is, High-Motivation/ Low-Constraint (HMLC) tourists and Low-Motivation/High-Constraint (LMHC) tourists. Based on the theoretical and empirical findings of the current research, it is recommended that destination marketers in South Africa: advertise specific benefits of touring South Africa, namely, increasing knowledge, relieving stress, and enjoying high environmental quality, to advance Chinese residents’ perceptions of the country; develop tourism experiences that can be taken in a week or shorter to cater for the unique annual leave and public holiday policy in China; launch a media relations campaign in China to ensure that the facts about South Africa are communicated without distortion; collaborate with other destination stakeholders such as government and businesses, to actively attract and retain Chinese tourists for example by educating the public about Chinese culture and training employees to improve the quality of service; target the HMLC tourists via the Internet (particularly the social media) and by developing holiday packages that include activities related to cultural tourism, rest and relaxation, and nature-based tourism; and target the LMHC tourists by cooperating with local travel agencies and by developing holiday packages that highlight the diversity of tourism activities and offer value-added products/services.
- Full Text:
- Date Issued: 2014
- Authors: Han, Xiliang
- Date: 2014
- Subjects: Market segmentation , Tourists -- Attitudes , Sustainable tourism -- South Africa
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:9325 , http://hdl.handle.net/10948/d1020945
- Description: The South African National Department of Tourism has recently initiated the National Tourism Sector Strategy aimed at developing a sustainable tourism economy, and making the country a Top 20 global tourism destination by 2020.China is one of South Africa’s major non-African sources of tourist arrivals. To ensure a growing share of this booming market, South African tourism scholars and practitioners have to pay close attention to the behaviour of Chinese outbound tourists, particularly their destination choice behaviour. The Theory of Planned Behaviour (TPB)– an extension of the Theory of Reasoned Action (TRA)– can serve as a basis for researching destination choice. According to the TPB literature, intention is the most immediate and important determinant of behaviour. Three direct predictors of intention, namely, attitude, subjective norms, and perceived control, are functions of latent behavioural, normative, and control beliefs, respectively. The TPB is parsimonious but open to the inclusion of additional predictors if there is evidence that these predictors may explain a significant proportion of the variance in intention and behaviour after the basic predictors (attitude, subjective norms, and perceived control) have been accounted for. The current research successfully extended the TPB model for predicting potential Chinese tourists’ intentions to visit South Africa by adding two additional variables: travel motivation and travel constraints. The push-pull motivation framework discussed in the study postulates that people travel because they are pushed by internal forces (inner needs) and pulled by external forces (destination attributes). Typical barriers to travel include intrapersonal, interpersonal, and structural constraints. The new model makes an important contribution to the literature on destination choice, and provides South Africa’s destination marketers with suggestions for attracting and serving Chinese tourists. In addition, the research shows that both travel motivation and travel constraints can be used as bases for segmenting the outbound Chinese tourist market interested in visiting South Africa. A survey approach and a structured questionnaire distributed electronically to the online panel members of a Chinese market research company were instrumental in collecting the empirical data for the study. The questionnaire was originally written in English and translated into Chinese (Mandarin) via a blind translation-back-translation method. Attitude, subjective norms, perceived control, and visit intention were all operationalised as unidimensional and used scales adapted from previous studies. New scales were developed for travel motivation and travel constraints– both operationalised as multidimensional. Quota sampling, used to identify respondents aged 18 or older and living in Beijing, Shanghai, and Guangzhou, resulted in 630 usable questionnaires obtained from 1,510 sent invitation e-mails, yielding a response rate of 41.7%. The raw data collected were prepared through the sequential steps of editing, coding, and filing, and then analysed using both descriptive and inferential statistics. Descriptive analysis suggested that broadening personal horizons, viewing the natural scenery, and seeing something different were the top motives for visiting South Africa, while language, fear of crime, and lack of travel companions were the top barriers to visiting South Africa. According to the factor analysis, travel motivation had three underlying dimensions – learning, escape, and aesthetics and appreciation, while operational, risk and fear, and social barriers were three underlying dimensions of travel constraints. Regression analysis showed that the proposed extended TPB model had higher predictive power for visit intention than both TRA and TPB models; the basic predictors – attitude, subjective norms, and perceived control – all had a significant impact on visit intention; and in terms of the additional predictors, learning, operational constraints, and social constraints had a significant impact on visit intention. The analysis of variance indicated that travel frequency and age were the most profound background factors with an influence on the extended TPB model. Finally, cluster analysis resulted in two market segments with distinct profiles, that is, High-Motivation/ Low-Constraint (HMLC) tourists and Low-Motivation/High-Constraint (LMHC) tourists. Based on the theoretical and empirical findings of the current research, it is recommended that destination marketers in South Africa: advertise specific benefits of touring South Africa, namely, increasing knowledge, relieving stress, and enjoying high environmental quality, to advance Chinese residents’ perceptions of the country; develop tourism experiences that can be taken in a week or shorter to cater for the unique annual leave and public holiday policy in China; launch a media relations campaign in China to ensure that the facts about South Africa are communicated without distortion; collaborate with other destination stakeholders such as government and businesses, to actively attract and retain Chinese tourists for example by educating the public about Chinese culture and training employees to improve the quality of service; target the HMLC tourists via the Internet (particularly the social media) and by developing holiday packages that include activities related to cultural tourism, rest and relaxation, and nature-based tourism; and target the LMHC tourists by cooperating with local travel agencies and by developing holiday packages that highlight the diversity of tourism activities and offer value-added products/services.
- Full Text:
- Date Issued: 2014
Citizenship rights : still a long road to travel - Graduation Ceremonies address 2014
- Authors: Badat, Saleem
- Date: 2014
- Language: English
- Type: Text
- Identifier: vital:7872 , http://hdl.handle.net/10962/d1016421
- Description: The 20th anniversary of our democracy is a good time to reflect on the progress that we have made with respect to citizenship in post-1994 South Africa. 1994 was a revolutionary breakthrough. From being a racially exclusive authoritarian society in which millions were downtrodden subjects, we became a democracy in which for the first time almost all inhabitants became citizens. Critical here was a commendable Constitution, including a Bill of Rights, which held out the promise of an extensive range of human, social and economic rights that did not exist for all or at all prior to 1994. During the past 20 years there have been significant economic and social gains and achievements. At the same time, there continue to be many challenges, and key institutions of our democracy have come under strain as a result of too many in power seeking to use the state as their private piggy bank. Still, a relatively independent judiciary, free media, autonomous universities and the like remain intact. Witness in this regard the magnificent performance of the Public Protector’s office under Thuli Madonsela. However, a number of contemporary realities, compromise the ideal of full and substantive citizenship rights for all that the Constitution promises. Indeed, they condemn large numbers of people to conditions that are associated with subjecthood and being subjects.
- Full Text:
- Date Issued: 2014
- Authors: Badat, Saleem
- Date: 2014
- Language: English
- Type: Text
- Identifier: vital:7872 , http://hdl.handle.net/10962/d1016421
- Description: The 20th anniversary of our democracy is a good time to reflect on the progress that we have made with respect to citizenship in post-1994 South Africa. 1994 was a revolutionary breakthrough. From being a racially exclusive authoritarian society in which millions were downtrodden subjects, we became a democracy in which for the first time almost all inhabitants became citizens. Critical here was a commendable Constitution, including a Bill of Rights, which held out the promise of an extensive range of human, social and economic rights that did not exist for all or at all prior to 1994. During the past 20 years there have been significant economic and social gains and achievements. At the same time, there continue to be many challenges, and key institutions of our democracy have come under strain as a result of too many in power seeking to use the state as their private piggy bank. Still, a relatively independent judiciary, free media, autonomous universities and the like remain intact. Witness in this regard the magnificent performance of the Public Protector’s office under Thuli Madonsela. However, a number of contemporary realities, compromise the ideal of full and substantive citizenship rights for all that the Constitution promises. Indeed, they condemn large numbers of people to conditions that are associated with subjecthood and being subjects.
- Full Text:
- Date Issued: 2014
Classification of the difficulty in accelerating problems using GPUs
- Authors: Tristram, Uvedale Roy
- Date: 2014
- Subjects: Graphics processing units , Computer algorithms , Computer programming , Problem solving -- Data processing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4699 , http://hdl.handle.net/10962/d1012978
- Description: Scientists continually require additional processing power, as this enables them to compute larger problem sizes, use more complex models and algorithms, and solve problems previously thought computationally impractical. General-purpose computation on graphics processing units (GPGPU) can help in this regard, as there is great potential in using graphics processors to accelerate many scientific models and algorithms. However, some problems are considerably harder to accelerate than others, and it may be challenging for those new to GPGPU to ascertain the difficulty of accelerating a particular problem or seek appropriate optimisation guidance. Through what was learned in the acceleration of a hydrological uncertainty ensemble model, large numbers of k-difference string comparisons, and a radix sort, problem attributes have been identified that can assist in the evaluation of the difficulty in accelerating a problem using GPUs. The identified attributes are inherent parallelism, branch divergence, problem size, required computational parallelism, memory access pattern regularity, data transfer overhead, and thread cooperation. Using these attributes as difficulty indicators, an initial problem difficulty classification framework has been created that aids in GPU acceleration difficulty evaluation. This framework further facilitates directed guidance on suggested optimisations and required knowledge based on problem classification, which has been demonstrated for the aforementioned accelerated problems. It is anticipated that this framework, or a derivative thereof, will prove to be a useful resource for new or novice GPGPU developers in the evaluation of potential problems for GPU acceleration.
- Full Text:
- Date Issued: 2014
- Authors: Tristram, Uvedale Roy
- Date: 2014
- Subjects: Graphics processing units , Computer algorithms , Computer programming , Problem solving -- Data processing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4699 , http://hdl.handle.net/10962/d1012978
- Description: Scientists continually require additional processing power, as this enables them to compute larger problem sizes, use more complex models and algorithms, and solve problems previously thought computationally impractical. General-purpose computation on graphics processing units (GPGPU) can help in this regard, as there is great potential in using graphics processors to accelerate many scientific models and algorithms. However, some problems are considerably harder to accelerate than others, and it may be challenging for those new to GPGPU to ascertain the difficulty of accelerating a particular problem or seek appropriate optimisation guidance. Through what was learned in the acceleration of a hydrological uncertainty ensemble model, large numbers of k-difference string comparisons, and a radix sort, problem attributes have been identified that can assist in the evaluation of the difficulty in accelerating a problem using GPUs. The identified attributes are inherent parallelism, branch divergence, problem size, required computational parallelism, memory access pattern regularity, data transfer overhead, and thread cooperation. Using these attributes as difficulty indicators, an initial problem difficulty classification framework has been created that aids in GPU acceleration difficulty evaluation. This framework further facilitates directed guidance on suggested optimisations and required knowledge based on problem classification, which has been demonstrated for the aforementioned accelerated problems. It is anticipated that this framework, or a derivative thereof, will prove to be a useful resource for new or novice GPGPU developers in the evaluation of potential problems for GPU acceleration.
- Full Text:
- Date Issued: 2014
Climate Change and Environmental Challenges in Southern African Development Community (SADC): Responses in the Age of Globalisation
- Chikunda, Charles, Mandikonza, Caleb
- Authors: Chikunda, Charles , Mandikonza, Caleb
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/437249 , vital:73363 , ISBN 9789462098367 , https://brill.com/display/book/9789462098367/BP000009.xml
- Description: There is evidence that one of the greatest controversies facing Africa today is how to make sense of the two leading global intentions of the 21st century: sustainable development and globalisation. These two paradigms appear to have some op-posing tendencies within them, some of which are contestable. Globalisation advocates for liberalisation; reduction or elimina-tion of state regulations on the market, free reign, and a high degree of rights to the large corporations that dominate the market. Globalisation also entails the cross flow of knowledge and knowledge forms.
- Full Text:
- Date Issued: 2014
- Authors: Chikunda, Charles , Mandikonza, Caleb
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/437249 , vital:73363 , ISBN 9789462098367 , https://brill.com/display/book/9789462098367/BP000009.xml
- Description: There is evidence that one of the greatest controversies facing Africa today is how to make sense of the two leading global intentions of the 21st century: sustainable development and globalisation. These two paradigms appear to have some op-posing tendencies within them, some of which are contestable. Globalisation advocates for liberalisation; reduction or elimina-tion of state regulations on the market, free reign, and a high degree of rights to the large corporations that dominate the market. Globalisation also entails the cross flow of knowledge and knowledge forms.
- Full Text:
- Date Issued: 2014
Climate change effects on animal and plant phylogenetic diversity in southern Africa
- Pio, Dorothea V, Engler, Robin, Linder, H Peter, Monadjem, Ara, Cotterill, Fenton P D, Taylor, Peter J, Schoeman, M Corrie, Price, Benjamin W, Villet, Martin H, Eick, Geeta, Salamin, Nicholas, Guisan, Antoine
- Authors: Pio, Dorothea V , Engler, Robin , Linder, H Peter , Monadjem, Ara , Cotterill, Fenton P D , Taylor, Peter J , Schoeman, M Corrie , Price, Benjamin W , Villet, Martin H , Eick, Geeta , Salamin, Nicholas , Guisan, Antoine
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441874 , vital:73930 , https://doi.org/10.1111/gcb.12524
- Description: Much attention has been paid to the effects of climate change on species' range reductions and extinctions. There is however surprisingly little information on how climate change driven threat may impact the tree of life and result in loss of phylogenetic diversity (PD). Some plant families and mammalian orders reveal nonrandom extinction patterns, but many other plant families do not. Do these discrepancies reflect different speciation histories and does climate induced extinction result in the same discrepancies among different groups? Answers to these questions require representative taxon sampling. Here, we combine phylogenetic analyses, species distribution modeling, and climate change projections on two of the largest plant families in the Cape Floristic Region (Proteaceae and Restionaceae), as well as the second most diverse mammalian order in Southern Africa (Chiroptera), and an herbivorous insect genus (Platypleura) in the family Cicadidae to answer this question. We model current and future species distributions to assess species threat levels over the next 70 years, and then compare projected with random PD survival. Results for these animal and plant clades reveal congruence. PD losses are not significantly higher under predicted extinction than under random extinction simulations. So far the evidence suggests that focusing resources on climate threatened species alone may not result in disproportionate benefits for the preservation of evolutionary history.
- Full Text:
- Date Issued: 2014
- Authors: Pio, Dorothea V , Engler, Robin , Linder, H Peter , Monadjem, Ara , Cotterill, Fenton P D , Taylor, Peter J , Schoeman, M Corrie , Price, Benjamin W , Villet, Martin H , Eick, Geeta , Salamin, Nicholas , Guisan, Antoine
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441874 , vital:73930 , https://doi.org/10.1111/gcb.12524
- Description: Much attention has been paid to the effects of climate change on species' range reductions and extinctions. There is however surprisingly little information on how climate change driven threat may impact the tree of life and result in loss of phylogenetic diversity (PD). Some plant families and mammalian orders reveal nonrandom extinction patterns, but many other plant families do not. Do these discrepancies reflect different speciation histories and does climate induced extinction result in the same discrepancies among different groups? Answers to these questions require representative taxon sampling. Here, we combine phylogenetic analyses, species distribution modeling, and climate change projections on two of the largest plant families in the Cape Floristic Region (Proteaceae and Restionaceae), as well as the second most diverse mammalian order in Southern Africa (Chiroptera), and an herbivorous insect genus (Platypleura) in the family Cicadidae to answer this question. We model current and future species distributions to assess species threat levels over the next 70 years, and then compare projected with random PD survival. Results for these animal and plant clades reveal congruence. PD losses are not significantly higher under predicted extinction than under random extinction simulations. So far the evidence suggests that focusing resources on climate threatened species alone may not result in disproportionate benefits for the preservation of evolutionary history.
- Full Text:
- Date Issued: 2014
Clinical experiences of third-year student nurses in a public college in the Eastern Cape
- Authors: Tyanti, Mandisa
- Date: 2014
- Language: English
- Type: Thesis , Masters , MSc (Nursing Science)
- Identifier: vital:11912 , http://hdl.handle.net/10353/d1016097
- Description: Clinical experience has always been an important part of nursing education. Nursing colleges require students to be placed in clinical areas in order to acquire new knowledge and skills. The purpose of the study was to explore and describe the clinical experiences during their clinical placement of the third-year student nurses at a public college in the Eastern Cape. The objectives of this study were: to explore and describe the experiences of the third-year student of a public nursing college in the Eastern Cape, and to describe strategies for the improvement of student learning during clinical practice. A qualitative, explorative and descriptive research design was used to describe the clinical experiences of these student nurses and the strategies for the improvement of student learning during clinical practice. Data were collected from focus group interviews, using a purposive and convenience sample from one college campus in the Eastern Cape. Tesch’s method of data analysis (in Creswell, 2003) was used to analyse data. Trustworthiness was ensured in this research by using Guba’s model (in Lincoln & Guba, 1985) of qualitative research. Ethical approval was obtained from the University of Fort Hare Research Ethics Committee, the Department of Health, Eastern Cape, the Head of the Nursing College, the Campus Head and the participants and ethical consideration was ensured throughout the research process. Themes and sub-themes emerged from data collected about the clinical experiences of the nurses. The study brought to light the experiences of third-year student nurses during allocation to clinical areas. The findings from this study revealed the need for proper clinical accompaniment by college staff to ensure that clinical learning is taking place. Strategies to improve learning in the clinical areas are described. and recommendations for nursing education and nursing practice are made. If this is applied, it will help the student nurses to be better professionals.
- Full Text:
- Date Issued: 2014
- Authors: Tyanti, Mandisa
- Date: 2014
- Language: English
- Type: Thesis , Masters , MSc (Nursing Science)
- Identifier: vital:11912 , http://hdl.handle.net/10353/d1016097
- Description: Clinical experience has always been an important part of nursing education. Nursing colleges require students to be placed in clinical areas in order to acquire new knowledge and skills. The purpose of the study was to explore and describe the clinical experiences during their clinical placement of the third-year student nurses at a public college in the Eastern Cape. The objectives of this study were: to explore and describe the experiences of the third-year student of a public nursing college in the Eastern Cape, and to describe strategies for the improvement of student learning during clinical practice. A qualitative, explorative and descriptive research design was used to describe the clinical experiences of these student nurses and the strategies for the improvement of student learning during clinical practice. Data were collected from focus group interviews, using a purposive and convenience sample from one college campus in the Eastern Cape. Tesch’s method of data analysis (in Creswell, 2003) was used to analyse data. Trustworthiness was ensured in this research by using Guba’s model (in Lincoln & Guba, 1985) of qualitative research. Ethical approval was obtained from the University of Fort Hare Research Ethics Committee, the Department of Health, Eastern Cape, the Head of the Nursing College, the Campus Head and the participants and ethical consideration was ensured throughout the research process. Themes and sub-themes emerged from data collected about the clinical experiences of the nurses. The study brought to light the experiences of third-year student nurses during allocation to clinical areas. The findings from this study revealed the need for proper clinical accompaniment by college staff to ensure that clinical learning is taking place. Strategies to improve learning in the clinical areas are described. and recommendations for nursing education and nursing practice are made. If this is applied, it will help the student nurses to be better professionals.
- Full Text:
- Date Issued: 2014
Cloud information security : a higher education perspective
- Authors: Van der Schyff, Karl Izak
- Date: 2014
- Subjects: Cloud computing -- Security measures , Information technology -- Security measures , Data protection , Internet in higher education , Education, Higher -- Technological innovations
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4692 , http://hdl.handle.net/10962/d1011607 , Cloud computing -- Security measures , Information technology -- Security measures , Data protection , Internet in higher education , Education, Higher -- Technological innovations
- Description: In recent years higher education institutions have come under increasing financial pressure. This has not only prompted universities to investigate more cost effective means of delivering course content and maintaining research output, but also to investigate the administrative functions that accompany them. As such, many South African universities have either adopted or are in the process of adopting some form of cloud computing given the recent drop in bandwidth costs. However, this adoption process has raised concerns about the security of cloud-based information and this has, in some cases, had a negative impact on the adoption process. In an effort to study these concerns many researchers have employed a positivist approach with little, if any, focus on the operational context of these universities. Moreover, there has been very little research, specifically within the South African context. This study addresses some of these concerns by investigating the threats and security incident response life cycle within a higher education cloud. This was done by initially conducting a small scale survey and a detailed thematic analysis of twelve interviews from three South African universities. The identified themes and their corresponding analyses and interpretation contribute on both a practical and theoretical level with the practical contributions relating to a set of security driven criteria for selecting cloud providers as well as recommendations for universities who have or are in the process of adopting cloud computing. Theoretically several conceptual frameworks are offered allowing the researcher to convey his understanding of how the aforementioned practical concepts relate to each other as well as the concepts that constitute the research questions of this study.
- Full Text:
- Date Issued: 2014
- Authors: Van der Schyff, Karl Izak
- Date: 2014
- Subjects: Cloud computing -- Security measures , Information technology -- Security measures , Data protection , Internet in higher education , Education, Higher -- Technological innovations
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4692 , http://hdl.handle.net/10962/d1011607 , Cloud computing -- Security measures , Information technology -- Security measures , Data protection , Internet in higher education , Education, Higher -- Technological innovations
- Description: In recent years higher education institutions have come under increasing financial pressure. This has not only prompted universities to investigate more cost effective means of delivering course content and maintaining research output, but also to investigate the administrative functions that accompany them. As such, many South African universities have either adopted or are in the process of adopting some form of cloud computing given the recent drop in bandwidth costs. However, this adoption process has raised concerns about the security of cloud-based information and this has, in some cases, had a negative impact on the adoption process. In an effort to study these concerns many researchers have employed a positivist approach with little, if any, focus on the operational context of these universities. Moreover, there has been very little research, specifically within the South African context. This study addresses some of these concerns by investigating the threats and security incident response life cycle within a higher education cloud. This was done by initially conducting a small scale survey and a detailed thematic analysis of twelve interviews from three South African universities. The identified themes and their corresponding analyses and interpretation contribute on both a practical and theoretical level with the practical contributions relating to a set of security driven criteria for selecting cloud providers as well as recommendations for universities who have or are in the process of adopting cloud computing. Theoretically several conceptual frameworks are offered allowing the researcher to convey his understanding of how the aforementioned practical concepts relate to each other as well as the concepts that constitute the research questions of this study.
- Full Text:
- Date Issued: 2014