A bulk and fraction-specific geochemical study of the origin of diverse high-grade hematitic iron ores from the Transvaal Supergroup, Northern Cape Province, South Africa
- Authors: Moloto, William
- Date: 2017
- Subjects: Iron ore -- South Africa -- Transvaal Supergroup , Hematite -- South Africa -- Transvaal Supergroup , Transvaal Supergroup (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/50546 , vital:25998
- Description: The Paleoproterozoic Transvaal Supergroup in the Northern Cape Province of South Africa is host to high-grade, Banded Iron Formation-hosted hematite iron-ore deposits and is the country’s most important source of iron to date. Previous studies suggest the origin of these iron ores to be ancient supergene, and that the ore forming process would have therefore pre-dated deposition of the basal Mapedi shales of the Olifansthoek Supergroup that unconformably overlies the Transvaal strata. The nature of the protolith to the ores has been suggested to be largely BIF of the Asbestos Hills Subgroup, and mainly the Kuruman BIF. The work presented in this thesis seeks to provide insights into the diversity of processes that are likely to have been involved during the genesis of these high-grade iron ores, in the context of constraining the pre-ore lithologies and the relative role of supergene-style, largely residual enrichment processes versus any possible metasomatic hydrothermal effects. This study had as primary focus the application of combined bulk and fraction-specific geochemical applications on representative iron-ore samples from four different localities in the Northern Cape Province, namely King/Khumani, Beeshoek, Heuninkranz and Hotazel. The collected samples show a variety of textures and also capture different pre-unconformity stratigraphic sections of BIF. The key objective was to assess whether the fraction-specific analytical results could provide any firm constraints for the origin of the ferrous and non-ferrous matrix fractions of the ores, namely whether they represent any combinations of protolith residue, allochtonously-introduced detritus or hydrothermally-derived material, and whether the results are comparable and consistent across all samples studied. In particular, constraints were sought as to whether the ore protolith was exclusively BIF or may potentially have contained at least a fraction of other lithologic types, such as shale; and whether there is sufficient evidence to support solely a supergene model for the ores or the data suggest other more epigenetic models of ore formation involving the action of hydrothermal fluids Bulk-rock geochemical analyses reveal the overwhelming dominance of Fe-oxide (as hematite) in all samples, at concentrations as high as 99 wt.% Fe2O3. Major and trace-element abundances of all samples were re-calculated assuming only iron addition from the postulated protolith (average BIF and shale), and the results revealed atypical enrichments in the iron ores by comparison to average BIF, and more shale-like relative abundances when normalised against the Post-Archaean Average Shale (PAAS). Specifically, BIF-normalised diagrams show relative enrichments by as much as 53-95% for Al2O3; 11-86% for TiO2; and 4-60% for P2O5. By contrast, PAAS-normalised values display enrichments of 1-3% for Al2O3, 0.2-3% for TiO2, and 3-13% for P2O5. Similar observations can be made for the greatest majority of trace elements when normalised against average BIF as compared to normalisation against PAAS. A suite of trace element that include alkali earths (e.g. Ba, Sr) and transition metals (e.g. Ni, Zn) show enrichments that are unrelated to the apparently detrital siliciclastic fraction of the ores, and are therefore linked to a possible hydrothermal input. Fraction-specific extractions were performed via the adaptation of existing dissolution protocols using oxalic acid (iron-oxide fraction) followed by HF digestion (silicate-fraction). The analyses of the produced aliquots using ICP-MS techniques, focused mainly on the REE abundances of the separated ferrous and non-ferrous matrix fractions and their comparisons to bulk-rock REE signatures. The results lend further support to the suggestion that the ore samples contain a predominant shale-like signal which does not directly compare to published REE signatures for supergene or hydrothermal BIF-hosted iron-ore deposits alike. The data therefore collectively point to a post-unconformity epigenetic hydrothermal event/s of iron ore-formation that would have exploited not only BIF but also shale as suitable pre-ore protolith.
- Full Text:
- Authors: Moloto, William
- Date: 2017
- Subjects: Iron ore -- South Africa -- Transvaal Supergroup , Hematite -- South Africa -- Transvaal Supergroup , Transvaal Supergroup (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/50546 , vital:25998
- Description: The Paleoproterozoic Transvaal Supergroup in the Northern Cape Province of South Africa is host to high-grade, Banded Iron Formation-hosted hematite iron-ore deposits and is the country’s most important source of iron to date. Previous studies suggest the origin of these iron ores to be ancient supergene, and that the ore forming process would have therefore pre-dated deposition of the basal Mapedi shales of the Olifansthoek Supergroup that unconformably overlies the Transvaal strata. The nature of the protolith to the ores has been suggested to be largely BIF of the Asbestos Hills Subgroup, and mainly the Kuruman BIF. The work presented in this thesis seeks to provide insights into the diversity of processes that are likely to have been involved during the genesis of these high-grade iron ores, in the context of constraining the pre-ore lithologies and the relative role of supergene-style, largely residual enrichment processes versus any possible metasomatic hydrothermal effects. This study had as primary focus the application of combined bulk and fraction-specific geochemical applications on representative iron-ore samples from four different localities in the Northern Cape Province, namely King/Khumani, Beeshoek, Heuninkranz and Hotazel. The collected samples show a variety of textures and also capture different pre-unconformity stratigraphic sections of BIF. The key objective was to assess whether the fraction-specific analytical results could provide any firm constraints for the origin of the ferrous and non-ferrous matrix fractions of the ores, namely whether they represent any combinations of protolith residue, allochtonously-introduced detritus or hydrothermally-derived material, and whether the results are comparable and consistent across all samples studied. In particular, constraints were sought as to whether the ore protolith was exclusively BIF or may potentially have contained at least a fraction of other lithologic types, such as shale; and whether there is sufficient evidence to support solely a supergene model for the ores or the data suggest other more epigenetic models of ore formation involving the action of hydrothermal fluids Bulk-rock geochemical analyses reveal the overwhelming dominance of Fe-oxide (as hematite) in all samples, at concentrations as high as 99 wt.% Fe2O3. Major and trace-element abundances of all samples were re-calculated assuming only iron addition from the postulated protolith (average BIF and shale), and the results revealed atypical enrichments in the iron ores by comparison to average BIF, and more shale-like relative abundances when normalised against the Post-Archaean Average Shale (PAAS). Specifically, BIF-normalised diagrams show relative enrichments by as much as 53-95% for Al2O3; 11-86% for TiO2; and 4-60% for P2O5. By contrast, PAAS-normalised values display enrichments of 1-3% for Al2O3, 0.2-3% for TiO2, and 3-13% for P2O5. Similar observations can be made for the greatest majority of trace elements when normalised against average BIF as compared to normalisation against PAAS. A suite of trace element that include alkali earths (e.g. Ba, Sr) and transition metals (e.g. Ni, Zn) show enrichments that are unrelated to the apparently detrital siliciclastic fraction of the ores, and are therefore linked to a possible hydrothermal input. Fraction-specific extractions were performed via the adaptation of existing dissolution protocols using oxalic acid (iron-oxide fraction) followed by HF digestion (silicate-fraction). The analyses of the produced aliquots using ICP-MS techniques, focused mainly on the REE abundances of the separated ferrous and non-ferrous matrix fractions and their comparisons to bulk-rock REE signatures. The results lend further support to the suggestion that the ore samples contain a predominant shale-like signal which does not directly compare to published REE signatures for supergene or hydrothermal BIF-hosted iron-ore deposits alike. The data therefore collectively point to a post-unconformity epigenetic hydrothermal event/s of iron ore-formation that would have exploited not only BIF but also shale as suitable pre-ore protolith.
- Full Text:
A case-control approach to assess variability in distribution of distance between transcription factor binding site and transcription start site
- Authors: Moos, Abdul Ragmaan
- Date: 2017
- Subjects: Transcription factors , Proteomics , Chromatin , Chromatin immunoprecipitation
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5315 , vital:20808
- Description: Using the in-silico approach, with ENCODE ChIP-seq data for various transcription factors and different cell types; we systematically compared the distance between the transcription factor binding site (TFBS) and the transcription start (TSS). Our aim was to determine if the same transcription factor binds at a different position relative to the TSS in a normal and an abnormal cell type. We compare distribution of distance of binding sites from the TSS; to make description less verbose we call this “distance” where there is no possibility of confusion. We used a case-control methodology where the distance between the TFBS and the TSS in the normal, non-cancerous or untreated cell type is the control. The distance between the TFBS and the TSS in the cancerous or treated cell type is the case. We use the distance between the TFBS and the TSS in the control as the standard. We compared the distance between the TFBS and the TSS in the case and the control. If the distance between the TFBS and the TSS in the control was greater than the distance between the TFBS and the TSS in the case, we can infer the following. The transcription factor in the case binds closer to the TSS compared to the control. If the distance between the TFBS and the TSS in the control is smaller than the distance between the TFBS and the TSS in the case, we can infer the following. The TF in the case binds further away from the TSS compared to the control. Our method is a screening method whereby we compare ChIP-seq data to determine if there is a difference in the distribution distance between the TFBS and the TSS for normal and abnormal cell types. We used the R package ChIP-Enrich to compare the distribution of distance between ChIP-seq peak and the nearest TSS. ChIP-Enrich produces a histogram with the number of ChIP-seq peaks at a certain distance from the TSS. The results indicate for some transcription factors like GM12878-cMyc and K562-cMyc there is a difference between the distribution of distance between the TFBS and the nearest TSS. cMyc has more binding sites within a distance of 1kb from the TSS in GM12878 when compared to K562. GM12878-CTCF and K562-CTCF have slight differences when comparing their distribution of distance from the TSS. This means CTCF binds almost the same distance from the TSS in both GM12878 and K562. A549-gr treated with dexamethasone is interesting because with increase dose of dexamethasone the distribution of distance from the TSS changes as well.
- Full Text:
- Authors: Moos, Abdul Ragmaan
- Date: 2017
- Subjects: Transcription factors , Proteomics , Chromatin , Chromatin immunoprecipitation
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5315 , vital:20808
- Description: Using the in-silico approach, with ENCODE ChIP-seq data for various transcription factors and different cell types; we systematically compared the distance between the transcription factor binding site (TFBS) and the transcription start (TSS). Our aim was to determine if the same transcription factor binds at a different position relative to the TSS in a normal and an abnormal cell type. We compare distribution of distance of binding sites from the TSS; to make description less verbose we call this “distance” where there is no possibility of confusion. We used a case-control methodology where the distance between the TFBS and the TSS in the normal, non-cancerous or untreated cell type is the control. The distance between the TFBS and the TSS in the cancerous or treated cell type is the case. We use the distance between the TFBS and the TSS in the control as the standard. We compared the distance between the TFBS and the TSS in the case and the control. If the distance between the TFBS and the TSS in the control was greater than the distance between the TFBS and the TSS in the case, we can infer the following. The transcription factor in the case binds closer to the TSS compared to the control. If the distance between the TFBS and the TSS in the control is smaller than the distance between the TFBS and the TSS in the case, we can infer the following. The TF in the case binds further away from the TSS compared to the control. Our method is a screening method whereby we compare ChIP-seq data to determine if there is a difference in the distribution distance between the TFBS and the TSS for normal and abnormal cell types. We used the R package ChIP-Enrich to compare the distribution of distance between ChIP-seq peak and the nearest TSS. ChIP-Enrich produces a histogram with the number of ChIP-seq peaks at a certain distance from the TSS. The results indicate for some transcription factors like GM12878-cMyc and K562-cMyc there is a difference between the distribution of distance between the TFBS and the nearest TSS. cMyc has more binding sites within a distance of 1kb from the TSS in GM12878 when compared to K562. GM12878-CTCF and K562-CTCF have slight differences when comparing their distribution of distance from the TSS. This means CTCF binds almost the same distance from the TSS in both GM12878 and K562. A549-gr treated with dexamethasone is interesting because with increase dose of dexamethasone the distribution of distance from the TSS changes as well.
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A code theory perspective on science access: clashes and conflicts
- Authors: Ellery, Karen
- Date: 2017
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/61196 , vital:27989 , http://dx.doi.org/10.208535/31-3-1306
- Description: Quantitative measures of student performance fail to provide insight into underpinning constraints and enablements to access in science in higher education. This case study of a science foundation course uses Legitimation Code Theory as a theoretical frame and acquisition of recognition and realisation rules as an analytical frame to provide a depth empirical account of student access and success. Results indicate that access to the powerful science knowledge in the production (science) context is dependent on students recognising and realising the knower code of the learning context, which requires of them to be independent and autonomous learners. Such access is not afforded when students prior (school) learning-context relativist code clashes with the required university learning-context knower code. It is argued that a focus on the learning context could be key in enabling access to students whose educational background does not align well with that of the higher education context.
- Full Text:
- Authors: Ellery, Karen
- Date: 2017
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/61196 , vital:27989 , http://dx.doi.org/10.208535/31-3-1306
- Description: Quantitative measures of student performance fail to provide insight into underpinning constraints and enablements to access in science in higher education. This case study of a science foundation course uses Legitimation Code Theory as a theoretical frame and acquisition of recognition and realisation rules as an analytical frame to provide a depth empirical account of student access and success. Results indicate that access to the powerful science knowledge in the production (science) context is dependent on students recognising and realising the knower code of the learning context, which requires of them to be independent and autonomous learners. Such access is not afforded when students prior (school) learning-context relativist code clashes with the required university learning-context knower code. It is argued that a focus on the learning context could be key in enabling access to students whose educational background does not align well with that of the higher education context.
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A community partner’s perceptions of a service-learning partnership
- Authors: Queripel, Kathryn
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/6978 , vital:21206
- Description: Literature has highlighted the importance of university-community partnerships in servicelearning (SL) as a vehicle for conducting a mutually beneficial service-learning programme (Dorado & Giles, 2004). This research aimed to investigate factors influencing a SL partnership through the insights of a particular community partner. Based on a case study of a rural school in the Eastern Cape, three community partners perceptions were obtained through in-depth semi-structured interviews. Thereafter, thematic analysis was used to analyse the data using Braun and Clarke’s (2006) six phase guide. Three main theme’s emerged from the data that shed light to the key issues shaping community partners perceptions. These were centred on the effects of apartheid including resources, geographic location, and level of commitment from the university. The findings of this research brought forward the importance of awareness of context, responding to the context and commitment displayed in the partnership. This research further highlights the need for community partner’s perspective in literature.
- Full Text:
- Authors: Queripel, Kathryn
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/6978 , vital:21206
- Description: Literature has highlighted the importance of university-community partnerships in servicelearning (SL) as a vehicle for conducting a mutually beneficial service-learning programme (Dorado & Giles, 2004). This research aimed to investigate factors influencing a SL partnership through the insights of a particular community partner. Based on a case study of a rural school in the Eastern Cape, three community partners perceptions were obtained through in-depth semi-structured interviews. Thereafter, thematic analysis was used to analyse the data using Braun and Clarke’s (2006) six phase guide. Three main theme’s emerged from the data that shed light to the key issues shaping community partners perceptions. These were centred on the effects of apartheid including resources, geographic location, and level of commitment from the university. The findings of this research brought forward the importance of awareness of context, responding to the context and commitment displayed in the partnership. This research further highlights the need for community partner’s perspective in literature.
- Full Text:
A comparative analysis of the new behaviours and terms introduced in the understatement penalty table in section 223 of the Tax Administration Act
- Authors: Doolan, Kim
- Date: 2017
- Subjects: South Africa. Tax Administration Act, 2011 , Taxation -- South Africa , Taxation -- Law and legislation -- South Africa , Tax administration and procedure -- Law and legislation -- South Africa , Tax penalties -- Law and legislation -- South Africa , Taxpayer compliance -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/5802 , vital:20977
- Description: The Tax Administration Act became effective on the 1 October 2012 and in Chapter 16 introduced the understatement penalty regime which replaced section 76 of the Income Tax Act. The understatement penalty is calculated by applying a percentage in terms of the table included in section 223 of the Tax Administration Act to the shortfall in tax giving rise to the imposition of the penalty. There are five behaviours reflected in the understatement penalty table in section 223, namely, “substantial understatement”, “reasonable care not taken in completing return”, “no reasonable grounds for tax position taken”, “gross negligence” and “intentional tax evasion”. “Substantial understatement” is the only behaviour defined in the Tax Administration Act. Section 222(1) of the Tax Administration Act requires SARS to impose the penalty reflected in the table in the event of an “understatement”, unless the “understatement” results from a “bona fide inadvertent error”. The term “bona fide inadvertent error” is not defined in the Tax Administration Act; neither is the term “obstructive”. The Memorandum on the Objects of the Tax Administration Laws Amendment Bill confirmed that guidance would be developed in this regard for the use of taxpayers and SARS officials. This guidance has not yet been released. Media reports express the view that the lack of definition of the behaviours is problematic for both SARS and taxpayers as the table is new and there is still room for interpretation and understanding of the meaning of each of the behaviours. The primary goal of this study was is to obtain a better understanding of the meaning of the new behaviours and terms introduced in the understatement penalty table. In addressing this main goal, the penalty tables and behaviours in legislation in New Zealand were compared to South Africa’s understatement penalty. The similarities and differences between the understatement penalty imposed in terms of Chapter 16 of the Tax Administration Act and the additional tax previously imposed in terms of section 76 of the Income Tax Act were also discussed to determine whether this would be of assistance in enabling a better understanding of the meaning of the behaviours and terms in section 223. Guidance on the interpretation of the various behaviours and terms was developed and a definition was proposed for the meaning of “bona fide inadvertent error” and “obstructive” to assist in the objective and consistent application of the understatement penalty table in relation to each shortfall identified. The proposed definition for “bona fide inadvertent error” is as follows: “An honest mistake made or simple oversight, which the taxpayer was not aware of, despite taking reasonable care and displaying a prudent attitude while making a genuine attempt to comply with all applicable tax obligations.” The definition for “obstructive” is proposed as: “Deliberately interfering with, causing difficulties (impeding) or delays in, or preventing the progress of a SARS audit or review.”
- Full Text:
- Authors: Doolan, Kim
- Date: 2017
- Subjects: South Africa. Tax Administration Act, 2011 , Taxation -- South Africa , Taxation -- Law and legislation -- South Africa , Tax administration and procedure -- Law and legislation -- South Africa , Tax penalties -- Law and legislation -- South Africa , Taxpayer compliance -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/5802 , vital:20977
- Description: The Tax Administration Act became effective on the 1 October 2012 and in Chapter 16 introduced the understatement penalty regime which replaced section 76 of the Income Tax Act. The understatement penalty is calculated by applying a percentage in terms of the table included in section 223 of the Tax Administration Act to the shortfall in tax giving rise to the imposition of the penalty. There are five behaviours reflected in the understatement penalty table in section 223, namely, “substantial understatement”, “reasonable care not taken in completing return”, “no reasonable grounds for tax position taken”, “gross negligence” and “intentional tax evasion”. “Substantial understatement” is the only behaviour defined in the Tax Administration Act. Section 222(1) of the Tax Administration Act requires SARS to impose the penalty reflected in the table in the event of an “understatement”, unless the “understatement” results from a “bona fide inadvertent error”. The term “bona fide inadvertent error” is not defined in the Tax Administration Act; neither is the term “obstructive”. The Memorandum on the Objects of the Tax Administration Laws Amendment Bill confirmed that guidance would be developed in this regard for the use of taxpayers and SARS officials. This guidance has not yet been released. Media reports express the view that the lack of definition of the behaviours is problematic for both SARS and taxpayers as the table is new and there is still room for interpretation and understanding of the meaning of each of the behaviours. The primary goal of this study was is to obtain a better understanding of the meaning of the new behaviours and terms introduced in the understatement penalty table. In addressing this main goal, the penalty tables and behaviours in legislation in New Zealand were compared to South Africa’s understatement penalty. The similarities and differences between the understatement penalty imposed in terms of Chapter 16 of the Tax Administration Act and the additional tax previously imposed in terms of section 76 of the Income Tax Act were also discussed to determine whether this would be of assistance in enabling a better understanding of the meaning of the behaviours and terms in section 223. Guidance on the interpretation of the various behaviours and terms was developed and a definition was proposed for the meaning of “bona fide inadvertent error” and “obstructive” to assist in the objective and consistent application of the understatement penalty table in relation to each shortfall identified. The proposed definition for “bona fide inadvertent error” is as follows: “An honest mistake made or simple oversight, which the taxpayer was not aware of, despite taking reasonable care and displaying a prudent attitude while making a genuine attempt to comply with all applicable tax obligations.” The definition for “obstructive” is proposed as: “Deliberately interfering with, causing difficulties (impeding) or delays in, or preventing the progress of a SARS audit or review.”
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A comparative study of the dosimetric features of α-Al2O3: C, Mg and α-Al2O3: C
- Kalita, Jitumani M, Chithambo, Makaiko L
- Authors: Kalita, Jitumani M , Chithambo, Makaiko L
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/113058 , vital:33694 , https://doi.org/10.1093/rpd/ncx039
- Description: A comparative study of the dosimetric features of α-Al2O3:C,Mg and α-Al2O3:C relevant to thermoluminescence dosimetry is reported. A glow curve of α-Al2O3:C,Mg measured at 1°C/s after beta irradiation to 1 Gy shows two subsidiary peaks at 42°C (labelled as I) and 72°C (II) and the main peak at 161°C (III) whereas a glow curve of α-Al2O3:C measured under the same conditions shows the main peak at 178°C (II′) and a lower intensity peak at 48°C (I′). Apart from these ones, there are several other peaks at temperatures beyond that of the main peak in both α-Al2O3:C,Mg and α-Al2O3:C. However, the latter are not included in this study. We report a comparative quantitative analysis of dose response and fading of peaks I, II and III of α-Al2O3:C,Mg and peaks I′ and II′ of α-Al2O3:C. Analysis shows that the dose response of peaks I and III is sublinear within 1–10 Gy whereas that of peak II is superlinear within 1–4 Gy followed by a sublinear region within 4–10 Gy. In comparison, the dose response of peak I′ is superlinear within 1–4 Gy followed by a sublinear region within 4–10 Gy whereas that of peak II′ is sublinear within 1–4 Gy followed by a superlinear region within 4–10 Gy. As regards to fading corresponding to 1 Gy, peak I is very unstable and fades within 300 s, peak II is more stable and takes up to 43200 s to fade. In comparison, peak III fades down to 30% of its initial intensity within 2400 s. Interestingly, between 2400 and 800 s, the intensity fades by 17% only. Regarding fading in α-Al2O3:C, peak I′ fades within 600 s whereas peak II′ shows an inverse fading behaviour up to 64800 s. The rate of fading for peaks I, II and III in α-Al2O3:C,Mg was found to decrease with increase in dose. However, no such behaviour was observed in α-Al2O3:C. The fading in both samples is discussed on the basis of a charge hopping mechanism.
- Full Text:
- Authors: Kalita, Jitumani M , Chithambo, Makaiko L
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/113058 , vital:33694 , https://doi.org/10.1093/rpd/ncx039
- Description: A comparative study of the dosimetric features of α-Al2O3:C,Mg and α-Al2O3:C relevant to thermoluminescence dosimetry is reported. A glow curve of α-Al2O3:C,Mg measured at 1°C/s after beta irradiation to 1 Gy shows two subsidiary peaks at 42°C (labelled as I) and 72°C (II) and the main peak at 161°C (III) whereas a glow curve of α-Al2O3:C measured under the same conditions shows the main peak at 178°C (II′) and a lower intensity peak at 48°C (I′). Apart from these ones, there are several other peaks at temperatures beyond that of the main peak in both α-Al2O3:C,Mg and α-Al2O3:C. However, the latter are not included in this study. We report a comparative quantitative analysis of dose response and fading of peaks I, II and III of α-Al2O3:C,Mg and peaks I′ and II′ of α-Al2O3:C. Analysis shows that the dose response of peaks I and III is sublinear within 1–10 Gy whereas that of peak II is superlinear within 1–4 Gy followed by a sublinear region within 4–10 Gy. In comparison, the dose response of peak I′ is superlinear within 1–4 Gy followed by a sublinear region within 4–10 Gy whereas that of peak II′ is sublinear within 1–4 Gy followed by a superlinear region within 4–10 Gy. As regards to fading corresponding to 1 Gy, peak I is very unstable and fades within 300 s, peak II is more stable and takes up to 43200 s to fade. In comparison, peak III fades down to 30% of its initial intensity within 2400 s. Interestingly, between 2400 and 800 s, the intensity fades by 17% only. Regarding fading in α-Al2O3:C, peak I′ fades within 600 s whereas peak II′ shows an inverse fading behaviour up to 64800 s. The rate of fading for peaks I, II and III in α-Al2O3:C,Mg was found to decrease with increase in dose. However, no such behaviour was observed in α-Al2O3:C. The fading in both samples is discussed on the basis of a charge hopping mechanism.
- Full Text:
A contemporary phenomenology of menstruation: Understanding the body in situation and as situation in public health interventions to address menstruation-related challenges
- Kelland, Lindsay, Paphitis, Sharli A, Macleod, Catriona I
- Authors: Kelland, Lindsay , Paphitis, Sharli A , Macleod, Catriona I
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/434293 , vital:73045 , ISBN 1879-243X , https://doi.org/10.1016/j.wsif.2017.09.004
- Description: Social science and public health research has pointed to, firstly, the challenges women face in terms of the management of menstruation and, secondly, to the negative symbolic associations made with the menstruating body. This research, however, seldom engages with philosophical issues relating to embodied subjectivity in order to explain and understand the trends noted. In this paper, we attempt to bridge the divide between feminist theory and current research on the menstruation-related challenges facing women today. We provide a feminist phenomenological account of menstruation in which women's shared bodily lived experiences of menstruation—the body as situation—are set within contexts that enable and/or restrain freedom—the body in situation. This account allows us to understand the universal and differentiated aspects of menstruation and menstrual management, thereby providing a nuanced picture of the interplay between the physical occurrence of menstruation, the symbolic associations made with menstruation, and the socio-material, historical and political conditions within which women live. Such an account, we suggest, should inform advocacy around public policy and institutional civic society that promotes the freedom of women to engage in important life projects, and ground public health interventions around menstruation related challenges.
- Full Text:
- Authors: Kelland, Lindsay , Paphitis, Sharli A , Macleod, Catriona I
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/434293 , vital:73045 , ISBN 1879-243X , https://doi.org/10.1016/j.wsif.2017.09.004
- Description: Social science and public health research has pointed to, firstly, the challenges women face in terms of the management of menstruation and, secondly, to the negative symbolic associations made with the menstruating body. This research, however, seldom engages with philosophical issues relating to embodied subjectivity in order to explain and understand the trends noted. In this paper, we attempt to bridge the divide between feminist theory and current research on the menstruation-related challenges facing women today. We provide a feminist phenomenological account of menstruation in which women's shared bodily lived experiences of menstruation—the body as situation—are set within contexts that enable and/or restrain freedom—the body in situation. This account allows us to understand the universal and differentiated aspects of menstruation and menstrual management, thereby providing a nuanced picture of the interplay between the physical occurrence of menstruation, the symbolic associations made with menstruation, and the socio-material, historical and political conditions within which women live. Such an account, we suggest, should inform advocacy around public policy and institutional civic society that promotes the freedom of women to engage in important life projects, and ground public health interventions around menstruation related challenges.
- Full Text:
A critical analysis of housing provision, livelihood activities and social reproduction in urban communities in South Africa: the case of Ezamokuhle, Mpumalanga
- Authors: Nkambule, Sipho Jonathan
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7788 , vital:21298
- Description: The post-apartheid South African state has formulated, introduced and implemented nationwide policies and programmes pertaining to urban housing in order to address and tackle the challenges of social reproduction in and for poor urban black communities. This however has been undermined for a number of reasons, such as state incapacities and the state’s neo-liberal overreliance on the market to remedy past injustices. At the same time households, as critical sites of social reproduction in poor urban black communities and under conditions of extreme vulnerability, engage in a range of productive and non-productive activities often in a desperate bid to construct and maintain a semblance of livelihood sustainability. The thesis seeks to critically understand the relationship between state housing programmes and the diverse livelihood activities of poor urban black households in South Africa in the context of an ongoing systemic crisis of social reproduction which exists in these urban communities. This is pursued with specific reference to eZamokuhle Township in Amersfoort, Mpumalanga Province. The thesis is framed conceptually in terms of the notion of social reproduction. In doing so, it brings together two sets of literature which are often disconnected. On the one hand, there is South African literature which critically analyses the post-apartheid state’s housing programmes including the many challenges which exist in this regard. On the other hand, there is literature which considers the urban livelihoods of poor black communities in contemporary South Africa and often from within some kind of livelihoods perspective. The thesis is innovative in bringing these two sets of literature together in terms of the overarching notion of social reproduction and providing, therefore, a more holistic and integrated understanding of the multi-dimensional character of social reproduction. The depth of the crisis of social reproduction in eZamokuhle is explicated and examined in this way but in a manner which articulates the lived experiences and agency of eZamokhule households despite vulnerability constraints and challenges.
- Full Text:
- Authors: Nkambule, Sipho Jonathan
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7788 , vital:21298
- Description: The post-apartheid South African state has formulated, introduced and implemented nationwide policies and programmes pertaining to urban housing in order to address and tackle the challenges of social reproduction in and for poor urban black communities. This however has been undermined for a number of reasons, such as state incapacities and the state’s neo-liberal overreliance on the market to remedy past injustices. At the same time households, as critical sites of social reproduction in poor urban black communities and under conditions of extreme vulnerability, engage in a range of productive and non-productive activities often in a desperate bid to construct and maintain a semblance of livelihood sustainability. The thesis seeks to critically understand the relationship between state housing programmes and the diverse livelihood activities of poor urban black households in South Africa in the context of an ongoing systemic crisis of social reproduction which exists in these urban communities. This is pursued with specific reference to eZamokuhle Township in Amersfoort, Mpumalanga Province. The thesis is framed conceptually in terms of the notion of social reproduction. In doing so, it brings together two sets of literature which are often disconnected. On the one hand, there is South African literature which critically analyses the post-apartheid state’s housing programmes including the many challenges which exist in this regard. On the other hand, there is literature which considers the urban livelihoods of poor black communities in contemporary South Africa and often from within some kind of livelihoods perspective. The thesis is innovative in bringing these two sets of literature together in terms of the overarching notion of social reproduction and providing, therefore, a more holistic and integrated understanding of the multi-dimensional character of social reproduction. The depth of the crisis of social reproduction in eZamokuhle is explicated and examined in this way but in a manner which articulates the lived experiences and agency of eZamokhule households despite vulnerability constraints and challenges.
- Full Text:
A critical analysis of the role of aid agencies in the Kenyan land policy process (1999-2012)
- Authors: Mrewa, Bernard
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7634 , vital:21280
- Description: Land is central to development policies globally, including with reference to Africa, but the land reform strategies and modalities often pursued by international development agencies are controversial in terms of their potential and actual impact on questions of land rights, possession and access as well as poverty reduction and economic development. In the current era of global neoliberal restructuring, as indeed in the past, international aid agencies (or donors) have identified the formation and reform of national land policies in Africa and elsewhere as crucial in terms of facilitating systematic and successful land reform measures. A practical example of this is the case of Kenya. In this context, this thesis seeks to critically analyse the role of development (or aid) agencies in the land policy-making process in Kenya from 1999 to 2012. In this regard, the thesis does not focus on the product of the policy process (i.e. the land policy) let alone the implementation or impact of the policy. Rather, it treats the policy process itself as worthy of investigation and analysis, and thus delves into the policy processes leading to the product (the Kenyan land policy). The involvement of aid agencies in land policy in Kenya is part of a broader pattern of development cooperation with the Kenyan state over an extended period of time. Despite this long-term integration of Kenya in the international development system and the direct and pronounced involvement of global donors in the land policy-making process in Kenya, land policy outcomes in Kenya cannot be reduced simply to the influence and power of these donors. While the thesis analyses in detail the various forms of donor input into the land policy process, it also highlights that other (Kenyan-based) actors were centrally involved in the land policy formation process in the country, including state bureaucrats and national politicians but also a diverse range of interests embedded in civil society. Development agency involvement in the land policy process can be only understood in relation to these other actors. In Kenya, donors in fact interacted with these other actors in complex and fluctuating ways as they sought to maximise their influence in the national land policy process, and the thesis examines these dynamic and sometimes turbulent social and political interactions. These interactions were further complicated in Kenya because of the highly-ethnicised character of national politics and the fact that the constitution-review process was taking place at the same time as the land policy process. Together, this meant that the land policy process at nation-state level in Kenya became both a focus and site of struggle between state and non-state actors (including donors).
- Full Text:
- Authors: Mrewa, Bernard
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7634 , vital:21280
- Description: Land is central to development policies globally, including with reference to Africa, but the land reform strategies and modalities often pursued by international development agencies are controversial in terms of their potential and actual impact on questions of land rights, possession and access as well as poverty reduction and economic development. In the current era of global neoliberal restructuring, as indeed in the past, international aid agencies (or donors) have identified the formation and reform of national land policies in Africa and elsewhere as crucial in terms of facilitating systematic and successful land reform measures. A practical example of this is the case of Kenya. In this context, this thesis seeks to critically analyse the role of development (or aid) agencies in the land policy-making process in Kenya from 1999 to 2012. In this regard, the thesis does not focus on the product of the policy process (i.e. the land policy) let alone the implementation or impact of the policy. Rather, it treats the policy process itself as worthy of investigation and analysis, and thus delves into the policy processes leading to the product (the Kenyan land policy). The involvement of aid agencies in land policy in Kenya is part of a broader pattern of development cooperation with the Kenyan state over an extended period of time. Despite this long-term integration of Kenya in the international development system and the direct and pronounced involvement of global donors in the land policy-making process in Kenya, land policy outcomes in Kenya cannot be reduced simply to the influence and power of these donors. While the thesis analyses in detail the various forms of donor input into the land policy process, it also highlights that other (Kenyan-based) actors were centrally involved in the land policy formation process in the country, including state bureaucrats and national politicians but also a diverse range of interests embedded in civil society. Development agency involvement in the land policy process can be only understood in relation to these other actors. In Kenya, donors in fact interacted with these other actors in complex and fluctuating ways as they sought to maximise their influence in the national land policy process, and the thesis examines these dynamic and sometimes turbulent social and political interactions. These interactions were further complicated in Kenya because of the highly-ethnicised character of national politics and the fact that the constitution-review process was taking place at the same time as the land policy process. Together, this meant that the land policy process at nation-state level in Kenya became both a focus and site of struggle between state and non-state actors (including donors).
- Full Text:
A critical analysis of the role of the Movement for Democratic Change (MDC) in the democratisation process in Zimbabwe from 2000 to 2016
- Authors: Mwonzora, Gift
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/8093 , vital:21353
- Description: The thesis provides a critical analysis of the role of the Movement for Democratic Change (MDC) in contributing to processes of democratisation in Zimbabwe from 2000 to 2016. The MDC was formed in 1999 and it became the most important opposition party to the ruling Zimbabwe African National Union-Patriotic Front (ZANU-PF) party in Zimbabwe since independence in 1980. During this period, though, the MDC also entered into a coalition government with ZANU-PF under the Government of National Unity (GNU) from 2009 to 2013. In characterising the Zimbabwean state as a semi-authoritarian regime with a defiant ruling party, the thesis identifies and examines the significant challenges faced by the MDC in seeking democratisation, including within the realms of electoral, constitutional and legislative change. At the same time, the MDC suffered from significant internal problems including major splits, with the original MDC becoming MDC-Tsvangirai (MDC-T) in 2005. In focusing on the MDC and democratisation over the entire course of the party’s existence, the thesis is able to identify any important differences between the pre-GNU period, the GNU period and the post-GNU period. As well, it is able to consider the changing relationships between the MDC and the pro-democracy forces from which it first emerged, namely urban civil society and trade unions. The thesis concludes that the effectiveness of the MDC in bringing about democratisation has been highly uneven across the realms of electoral, constitutional and legislative change, and that any changes are necessarily tentative and subject to reversals given the ongoing semi-authoritarian regime in which the ruling ZANU-PF party has in effect fused with the state. Though there has been some evidence of democratic transition in Zimbabwe under the influence of the MDC (and MDC-T), more far-reaching democratic consolidation remains elusive. The fieldwork for the thesis is in large part based on a qualitative research methodology, involving key informant interviews, observations, primary documentation, and participation in political rallies and public lectures.
- Full Text:
- Authors: Mwonzora, Gift
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/8093 , vital:21353
- Description: The thesis provides a critical analysis of the role of the Movement for Democratic Change (MDC) in contributing to processes of democratisation in Zimbabwe from 2000 to 2016. The MDC was formed in 1999 and it became the most important opposition party to the ruling Zimbabwe African National Union-Patriotic Front (ZANU-PF) party in Zimbabwe since independence in 1980. During this period, though, the MDC also entered into a coalition government with ZANU-PF under the Government of National Unity (GNU) from 2009 to 2013. In characterising the Zimbabwean state as a semi-authoritarian regime with a defiant ruling party, the thesis identifies and examines the significant challenges faced by the MDC in seeking democratisation, including within the realms of electoral, constitutional and legislative change. At the same time, the MDC suffered from significant internal problems including major splits, with the original MDC becoming MDC-Tsvangirai (MDC-T) in 2005. In focusing on the MDC and democratisation over the entire course of the party’s existence, the thesis is able to identify any important differences between the pre-GNU period, the GNU period and the post-GNU period. As well, it is able to consider the changing relationships between the MDC and the pro-democracy forces from which it first emerged, namely urban civil society and trade unions. The thesis concludes that the effectiveness of the MDC in bringing about democratisation has been highly uneven across the realms of electoral, constitutional and legislative change, and that any changes are necessarily tentative and subject to reversals given the ongoing semi-authoritarian regime in which the ruling ZANU-PF party has in effect fused with the state. Though there has been some evidence of democratic transition in Zimbabwe under the influence of the MDC (and MDC-T), more far-reaching democratic consolidation remains elusive. The fieldwork for the thesis is in large part based on a qualitative research methodology, involving key informant interviews, observations, primary documentation, and participation in political rallies and public lectures.
- Full Text:
A critical evaluation of inter-jurisdictional rules in the South African value-added tax system
- Authors: Schneider, Ferdinand Dirk
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7971 , vital:21329
- Description: This study analysed the current inter-jurisdictional rules in the South African Value-Added Tax (VAT) system, identified shortcomings, and proposed legislative amendments or additions to address these shortcomings. The research was conducted within an interpretative post positivism paradigm, applied a qualitative research methodology, and a doctrinal research method. A detailed review of the literature was conducted to establish the theoretical basis of a good tax system and the theory underpinning indirect and consumption taxation. The literature review also included an in-depth analysis of the South African VAT system and its treatment of resident and non-resident businesses with a South African physical or economic reach, and its treatment of local and cross-border transactions, including imported services. The literature review also considered the international VAT treatment of these transactions. To obtain a wider range of expert opinions regarding shortcomings in inter-jurisdictional rules in the South African VAT system, data was collected through structured interviews with South African and global VAT and indirect tax experts, using a questionnaire that was specifically designed for this purpose. This study proposed amendments and additions to the VAT Act, dealing with the VAT registration of non-resident suppliers; addressing various issues relating to the interjurisdictional VAT rate; proposing measures in connection with imported services; and legislating the intention of the legislator to tax final utilisation or consumption. The study finally recommended the introduction of a general place of supply rule linked to residency; specific place of supply rules for electronic, broadcasting, and telecommunication services; and zero rating provisions for electronic, broadcasting, and telecommunication services provided to non-resident suppliers by resident suppliers for services initiated outside South Africa.
- Full Text:
- Authors: Schneider, Ferdinand Dirk
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7971 , vital:21329
- Description: This study analysed the current inter-jurisdictional rules in the South African Value-Added Tax (VAT) system, identified shortcomings, and proposed legislative amendments or additions to address these shortcomings. The research was conducted within an interpretative post positivism paradigm, applied a qualitative research methodology, and a doctrinal research method. A detailed review of the literature was conducted to establish the theoretical basis of a good tax system and the theory underpinning indirect and consumption taxation. The literature review also included an in-depth analysis of the South African VAT system and its treatment of resident and non-resident businesses with a South African physical or economic reach, and its treatment of local and cross-border transactions, including imported services. The literature review also considered the international VAT treatment of these transactions. To obtain a wider range of expert opinions regarding shortcomings in inter-jurisdictional rules in the South African VAT system, data was collected through structured interviews with South African and global VAT and indirect tax experts, using a questionnaire that was specifically designed for this purpose. This study proposed amendments and additions to the VAT Act, dealing with the VAT registration of non-resident suppliers; addressing various issues relating to the interjurisdictional VAT rate; proposing measures in connection with imported services; and legislating the intention of the legislator to tax final utilisation or consumption. The study finally recommended the introduction of a general place of supply rule linked to residency; specific place of supply rules for electronic, broadcasting, and telecommunication services; and zero rating provisions for electronic, broadcasting, and telecommunication services provided to non-resident suppliers by resident suppliers for services initiated outside South Africa.
- Full Text:
A critical realist dialectical understanding of learning pathways associated with two scarce skill environmental occupations within a transitioning systems frame
- Authors: Ramsarup, Presha
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/5937 , vital:20992
- Description: Policy, environmental, social and economic factors are all driving South Africa's transition to sustainable development and a greener economy. Various policies have been developed to foster sustainable development in the post-apartheid era in South Africa (i.e. since 1994) and there are various projections on potential job creation for a green economy. However, there is a problem related to both the achievement of sustainable development and green economy objectives: South Africa is said to lack adequately qualified people to implement these goals resulting in what is termed 'scarce skills' in the environmental and sustainable development sector. This problem has, in turn, prompted various skills development studies in the environmental sector, including a national Environmental Sector Skills Plan produced in 2010. All these studies point to a reactive skills development system that provides inadequate learning pathways for existing and newly emerging green occupations, which provided the impetus for a more proactive, transformative praxis oriented system of skills development that supports environmental learning pathways in South Africa. A second problem is that the concept of 'learning pathway' is poorly defined in the South African environmental education and wider education and training policy context. This term is often used in policy discourse within the notion of 'seamless learning pathways' and is only vaguely defined. This study set out to investigate selected occupationally directed environmental learning pathways in the South African National Qualifications Framework (NQF) and green transitioning context. In attempting to characterise the nature of the environmental pathway, the study utilised critical realist metatheory which serves as an underlabourer for domain specific theory of transitioning societies and systems, life-course transitions and career development. This theoretical work allowed the characterisation of environmental learning pathways as educational and occupational progression. The study investigated the nature of learning and work transitions across the life- course of selected environmental professionals in two key occupational categories - environmental engineer and environmental scientist - both of which have been defined as scarce skills in South Africa. This enabled a nuanced examination of the formation of what emerged as 'boundaryless' career stories of professionals engaged in these two occupations. The study also sought to engage with a methodological problem in learning pathways research, notably that studies are generally framed either at the micro level career story, emphasising agency of individuals (voluntarism), or at the policy level, emphasising structural aspects of the skills development system (determinism). This study sought to bridge the macro-micro problem drawing on critical realist retroductive analysis; this facilitated the shift from a focus on events and experiences that can be empirically observed (captured in case study approaches) to the causal mechanisms influencing environmental learning pathways in these two scarce skill occupations (discussed and analysed using dialectical critical realism), shedding light on how systemic and structural dynamics and mechanisms shape and influence the emergence of learning pathways as experienced in scarce skill occupations in the environmental sector. The opening chapters of the thesis provide an historical view of how the South African education and training system, itself in a transitioning process, has had to grapple with how to respond to and meaningfully take up the new emerging environmental / sustainable development mandate, which is increasingly framed within a multi-levelled transitioning social-ecological system perspective in post-apartheid South Africa. These transitioning systems are shaped by substantive policy imperatives for societal transformation, social justice, sustainable development and equity. Since 1994, various transformations have been taking place, often in paradoxical forms, in both the environmental and educational sectors, shaping a complex multi-levelled transitioning systems perspective for the study. This background work on transitioning systems provides the foundation for the first data chapter, which provides a descriptive outline of key supply side systemic elements as these pertain to environmental learning pathways more broadly (qualifications; occupational framing; career systems; sector skills planning). It also points to the lack of adequate mechanisms for analysing demand for environmental occupations, and highlights some of the contradictions in the supply- demand relation as these pertain to newly emerging environmental occupations. This helps to explain the empirical findings of previous environmental sector studies on the slow and reactive defining of environmental education and training for environmental occupations within the transforming education and training system in South Africa. The next two chapters, using case-based qualitative data, present the analysis of the two scarce skill occupations investigated - environmental engineer and environmental scientist. These chapters outline the dominant institutional educational pathway and the key supply platforms that support these pathways (career guidance; qualifications, occupational framings, skills planning) and the learning and work transitions of professionals within the occupation. The chapters highlight the factors and causal mechanisms influencing these learning pathways and thus provide insight into the multi-level dynamics that underpin learning pathways. The final chapter uses dialectical critical realism to outline generative mechanisms influencing the construction of the learning pathways. It also highlights key absences that are shaping the emergence (or not) of environmental learning pathways, thus pointing to opportunities for how the NQF might respond to the two scarce skill occupations under study, and to the emergence of environmental learning pathways more broadly within the framework of society-in-transition. Through this, the study links the career stories as analysed within the framework of learning pathways and skills system transitioning literature, to generative mechanisms and system development elements. The study concludes with providing occupational and systemic insights into absences and disjunctures that characterise the emergence (or not) of occupationally oriented environmental learning pathways. It also provides insight into what leads to these absences, and how they are kept in place and suggests possibilities and openings for transformative praxis within a multi-levelled transitioning system framework. The study makes the following contributions: At a theoretical level, the study has shown that environmental learning pathways need to be viewed as a complex phenomenon that is emergent in open systems and constituted by dialectically interdependent planes. A deeper understanding of environmental learning pathways is driven by both educational and occupational progression. It utilises key contemporary ideas around learning and work transitions but links them to the broader analyses of transitioning societies influencing the environmental sector, indicating the significance of how environmental education and training system development is situated within the wider transitioning process oriented towards social-ecological sustainability, social justice and greener economies. This study has further identified green skills as an important focus in research work on transitioning societies. At a methodological level, the study has shown how macro-micro and laminated system research can be useful in studying transitioning systems. As a laminated systems study with a focus on transitioning societies, it provides a baseline for further systems study on green work and green skills. At a practical level, the study has made actual contributions to the conceptualisation of learning pathways in the South African NQF context, to building and informing future green skill developments in the South African post-school system, the environmental sector and to informing conceptualising in the emergent Green Skills project.
- Full Text:
- Authors: Ramsarup, Presha
- Date: 2017
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/5937 , vital:20992
- Description: Policy, environmental, social and economic factors are all driving South Africa's transition to sustainable development and a greener economy. Various policies have been developed to foster sustainable development in the post-apartheid era in South Africa (i.e. since 1994) and there are various projections on potential job creation for a green economy. However, there is a problem related to both the achievement of sustainable development and green economy objectives: South Africa is said to lack adequately qualified people to implement these goals resulting in what is termed 'scarce skills' in the environmental and sustainable development sector. This problem has, in turn, prompted various skills development studies in the environmental sector, including a national Environmental Sector Skills Plan produced in 2010. All these studies point to a reactive skills development system that provides inadequate learning pathways for existing and newly emerging green occupations, which provided the impetus for a more proactive, transformative praxis oriented system of skills development that supports environmental learning pathways in South Africa. A second problem is that the concept of 'learning pathway' is poorly defined in the South African environmental education and wider education and training policy context. This term is often used in policy discourse within the notion of 'seamless learning pathways' and is only vaguely defined. This study set out to investigate selected occupationally directed environmental learning pathways in the South African National Qualifications Framework (NQF) and green transitioning context. In attempting to characterise the nature of the environmental pathway, the study utilised critical realist metatheory which serves as an underlabourer for domain specific theory of transitioning societies and systems, life-course transitions and career development. This theoretical work allowed the characterisation of environmental learning pathways as educational and occupational progression. The study investigated the nature of learning and work transitions across the life- course of selected environmental professionals in two key occupational categories - environmental engineer and environmental scientist - both of which have been defined as scarce skills in South Africa. This enabled a nuanced examination of the formation of what emerged as 'boundaryless' career stories of professionals engaged in these two occupations. The study also sought to engage with a methodological problem in learning pathways research, notably that studies are generally framed either at the micro level career story, emphasising agency of individuals (voluntarism), or at the policy level, emphasising structural aspects of the skills development system (determinism). This study sought to bridge the macro-micro problem drawing on critical realist retroductive analysis; this facilitated the shift from a focus on events and experiences that can be empirically observed (captured in case study approaches) to the causal mechanisms influencing environmental learning pathways in these two scarce skill occupations (discussed and analysed using dialectical critical realism), shedding light on how systemic and structural dynamics and mechanisms shape and influence the emergence of learning pathways as experienced in scarce skill occupations in the environmental sector. The opening chapters of the thesis provide an historical view of how the South African education and training system, itself in a transitioning process, has had to grapple with how to respond to and meaningfully take up the new emerging environmental / sustainable development mandate, which is increasingly framed within a multi-levelled transitioning social-ecological system perspective in post-apartheid South Africa. These transitioning systems are shaped by substantive policy imperatives for societal transformation, social justice, sustainable development and equity. Since 1994, various transformations have been taking place, often in paradoxical forms, in both the environmental and educational sectors, shaping a complex multi-levelled transitioning systems perspective for the study. This background work on transitioning systems provides the foundation for the first data chapter, which provides a descriptive outline of key supply side systemic elements as these pertain to environmental learning pathways more broadly (qualifications; occupational framing; career systems; sector skills planning). It also points to the lack of adequate mechanisms for analysing demand for environmental occupations, and highlights some of the contradictions in the supply- demand relation as these pertain to newly emerging environmental occupations. This helps to explain the empirical findings of previous environmental sector studies on the slow and reactive defining of environmental education and training for environmental occupations within the transforming education and training system in South Africa. The next two chapters, using case-based qualitative data, present the analysis of the two scarce skill occupations investigated - environmental engineer and environmental scientist. These chapters outline the dominant institutional educational pathway and the key supply platforms that support these pathways (career guidance; qualifications, occupational framings, skills planning) and the learning and work transitions of professionals within the occupation. The chapters highlight the factors and causal mechanisms influencing these learning pathways and thus provide insight into the multi-level dynamics that underpin learning pathways. The final chapter uses dialectical critical realism to outline generative mechanisms influencing the construction of the learning pathways. It also highlights key absences that are shaping the emergence (or not) of environmental learning pathways, thus pointing to opportunities for how the NQF might respond to the two scarce skill occupations under study, and to the emergence of environmental learning pathways more broadly within the framework of society-in-transition. Through this, the study links the career stories as analysed within the framework of learning pathways and skills system transitioning literature, to generative mechanisms and system development elements. The study concludes with providing occupational and systemic insights into absences and disjunctures that characterise the emergence (or not) of occupationally oriented environmental learning pathways. It also provides insight into what leads to these absences, and how they are kept in place and suggests possibilities and openings for transformative praxis within a multi-levelled transitioning system framework. The study makes the following contributions: At a theoretical level, the study has shown that environmental learning pathways need to be viewed as a complex phenomenon that is emergent in open systems and constituted by dialectically interdependent planes. A deeper understanding of environmental learning pathways is driven by both educational and occupational progression. It utilises key contemporary ideas around learning and work transitions but links them to the broader analyses of transitioning societies influencing the environmental sector, indicating the significance of how environmental education and training system development is situated within the wider transitioning process oriented towards social-ecological sustainability, social justice and greener economies. This study has further identified green skills as an important focus in research work on transitioning societies. At a methodological level, the study has shown how macro-micro and laminated system research can be useful in studying transitioning systems. As a laminated systems study with a focus on transitioning societies, it provides a baseline for further systems study on green work and green skills. At a practical level, the study has made actual contributions to the conceptualisation of learning pathways in the South African NQF context, to building and informing future green skill developments in the South African post-school system, the environmental sector and to informing conceptualising in the emergent Green Skills project.
- Full Text:
A critical review of the response of the Environmental Literacy Skills Programme to learner capabilities, and to the demands of the Working for Water training setting in an emerging Green Economy
- Authors: Fourie, Kathryn
- Date: 2017
- Subjects: Working for Water Programme , Environmental Literacy Skills Programme , Environmental education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/7879 , vital:21317
- Description: This case study is guided by a social realist research approach. It is an investigation into if and how the Environmental Literacy Skills Programme (ESLP) responds to Working for Water learners' capabilities and the enabling and constraining factors that shape these, and to the demands of the WfW training setting in an emerging Green Economy. The context for the study is that of the Working for Water programme, an Expanded Public Works Programme (EPWP) run under the auspices of the Department of Environmental Affairs in South Africa. The study took place while piloting the newly created ELSP materials with a group of beneficiaries and contractors in Uitenhage, a town in South Africa's Eastern Cape Province. The study provides insights into the application of accredited training in an EPWP training environment, and critically considers the academic and practical suitability of the ELSP in the WfW context. It achieves this by considering how the ELSP seeks to respond to the education levels and experiences of contractors and beneficiaries, and the demands of the WfW training setting. To understand what underpins learner capabilities and experiences, it was necessary to investigate the conversion factors and enabling and constraining factors that influence WfW contractor and beneficiary capabilities and involvement in the ELSP training in the context of an emerging Green Economy. To develop these insights, data was gathered through participant observation, questionnaires, structured and semi-structured interviews, as well as document analysis. The theoretical framework of Amartya Sen's (1999) Capability Approach supports the study, which provides an alternative way of understanding the freedoms that people enjoy, or the lack of freedom they experience, in being able to live the kind of life they have reason to value. The Capability Approach provides the key concept of resource conversion, which is used in the study to discern the social, personal and environmental constraints and enablers that people experience in their lives. These either assist or dis-enable a person in converting a resource such as education, into a functioning such as desired employment. Through a social realist causal analysis model, key structures are identified that underpin the actions of beneficiaries and contractors in relation to their learning and career pathways. The study shows that while the ELSP does support the development of green skills and in part responds to learner capabilities (and enabling and constraining conversion factors), there is a lack of information as to where those skills can be applied in elementary green occupations, in part due to South Africa's focus on high-skills development linked to Green Economy objectives. The study makes recommendations for aligning environmental education with career guidance, as well as a recommendation for further detailed research into identifying elementary green occupations and associated learning pathways.
- Full Text:
- Authors: Fourie, Kathryn
- Date: 2017
- Subjects: Working for Water Programme , Environmental Literacy Skills Programme , Environmental education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/7879 , vital:21317
- Description: This case study is guided by a social realist research approach. It is an investigation into if and how the Environmental Literacy Skills Programme (ESLP) responds to Working for Water learners' capabilities and the enabling and constraining factors that shape these, and to the demands of the WfW training setting in an emerging Green Economy. The context for the study is that of the Working for Water programme, an Expanded Public Works Programme (EPWP) run under the auspices of the Department of Environmental Affairs in South Africa. The study took place while piloting the newly created ELSP materials with a group of beneficiaries and contractors in Uitenhage, a town in South Africa's Eastern Cape Province. The study provides insights into the application of accredited training in an EPWP training environment, and critically considers the academic and practical suitability of the ELSP in the WfW context. It achieves this by considering how the ELSP seeks to respond to the education levels and experiences of contractors and beneficiaries, and the demands of the WfW training setting. To understand what underpins learner capabilities and experiences, it was necessary to investigate the conversion factors and enabling and constraining factors that influence WfW contractor and beneficiary capabilities and involvement in the ELSP training in the context of an emerging Green Economy. To develop these insights, data was gathered through participant observation, questionnaires, structured and semi-structured interviews, as well as document analysis. The theoretical framework of Amartya Sen's (1999) Capability Approach supports the study, which provides an alternative way of understanding the freedoms that people enjoy, or the lack of freedom they experience, in being able to live the kind of life they have reason to value. The Capability Approach provides the key concept of resource conversion, which is used in the study to discern the social, personal and environmental constraints and enablers that people experience in their lives. These either assist or dis-enable a person in converting a resource such as education, into a functioning such as desired employment. Through a social realist causal analysis model, key structures are identified that underpin the actions of beneficiaries and contractors in relation to their learning and career pathways. The study shows that while the ELSP does support the development of green skills and in part responds to learner capabilities (and enabling and constraining conversion factors), there is a lack of information as to where those skills can be applied in elementary green occupations, in part due to South Africa's focus on high-skills development linked to Green Economy objectives. The study makes recommendations for aligning environmental education with career guidance, as well as a recommendation for further detailed research into identifying elementary green occupations and associated learning pathways.
- Full Text:
A discursive analysis of what sexual violence perpetrators say to their victims
- Authors: Coopoo, Perishka
- Date: 2017
- Subjects: Project Unbreakable , Rapists -- Language , Rape -- Social aspects , Language and sex , Sexual harassment of women , Women -- Crimes against , Discoure analysis
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/13869 , vital:21863
- Description: This research study aimed to examine the way in which sexual violence perpetrators talk to their victims by critically investigating the discursive strategies drawn on by perpetrators, the discursive constructions of their actions and their victims, and the consistencies with the talk of sexual violence perpetrators and rape myths and discursive and social practices promoting sexual violence. Over two-hundred photographs were collected from a photographic art project called Project Unbreakable. The photographs were of sexual violence survivors, from all over the world, holding a poster with a quote from their attacker. The words that survivors chose to represent for Project Unbreakable served as the data for this research study. The data were analyzed using the six stages of Foucauldian discourse analysis outlined by Carla Willig. The analysis revealed that by drawing on discourses of pleasure, desire, romance, marriage and consent, perpetrators discursively constructed their actions as sex. Furthermore, perpetrators discursively constructed their victims as sexually passive and dependant on men, as gate keepers of men’s sexuality, as sexual instruments for male satisfaction, and as consenting persons. On the other hand, perpetrators were also found to discursively construct their actions as a legitimized form of punishment, humiliation and intimidation. In addition, their victims were discursively constructed as deviant, deserving of their victimization, worthless, damaged and powerless. These discursive constructions of their actions and their victims enabled perpetrators to normalize their behaviour, blame their victims, minimize the incident, assert their innocence, justify their actions, silence their victims and reinforce their position at the top of the gender hierarchy. Consistencies were also found between the talk of perpetrators and rape myths, stereotypes and discursive and social practices promoting sexual violence. Another interesting finding in the data was that of quotes from a third party, not the perpetrator, which further illustrated the existence of rape culture. This research draws on the idea that a rape supportive culture does not only capture the hostile nature of the social environment that many survivors experience in the aftermath of sexual violence, but it also provides a social pattern for coercive sexuality to occur.
- Full Text:
- Authors: Coopoo, Perishka
- Date: 2017
- Subjects: Project Unbreakable , Rapists -- Language , Rape -- Social aspects , Language and sex , Sexual harassment of women , Women -- Crimes against , Discoure analysis
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/13869 , vital:21863
- Description: This research study aimed to examine the way in which sexual violence perpetrators talk to their victims by critically investigating the discursive strategies drawn on by perpetrators, the discursive constructions of their actions and their victims, and the consistencies with the talk of sexual violence perpetrators and rape myths and discursive and social practices promoting sexual violence. Over two-hundred photographs were collected from a photographic art project called Project Unbreakable. The photographs were of sexual violence survivors, from all over the world, holding a poster with a quote from their attacker. The words that survivors chose to represent for Project Unbreakable served as the data for this research study. The data were analyzed using the six stages of Foucauldian discourse analysis outlined by Carla Willig. The analysis revealed that by drawing on discourses of pleasure, desire, romance, marriage and consent, perpetrators discursively constructed their actions as sex. Furthermore, perpetrators discursively constructed their victims as sexually passive and dependant on men, as gate keepers of men’s sexuality, as sexual instruments for male satisfaction, and as consenting persons. On the other hand, perpetrators were also found to discursively construct their actions as a legitimized form of punishment, humiliation and intimidation. In addition, their victims were discursively constructed as deviant, deserving of their victimization, worthless, damaged and powerless. These discursive constructions of their actions and their victims enabled perpetrators to normalize their behaviour, blame their victims, minimize the incident, assert their innocence, justify their actions, silence their victims and reinforce their position at the top of the gender hierarchy. Consistencies were also found between the talk of perpetrators and rape myths, stereotypes and discursive and social practices promoting sexual violence. Another interesting finding in the data was that of quotes from a third party, not the perpetrator, which further illustrated the existence of rape culture. This research draws on the idea that a rape supportive culture does not only capture the hostile nature of the social environment that many survivors experience in the aftermath of sexual violence, but it also provides a social pattern for coercive sexuality to occur.
- Full Text:
A dynamic approach to assess the International Criminal Court's performance in the Kenya cases
- Juma, Laurence, Khamala, C A
- Authors: Juma, Laurence , Khamala, C A
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125241 , vital:35749 , https://hdl.handle.net/10520/EJC-e9dcefddf
- Description: Victims of crimes against humanity perpetrated during Kenya’s post-2007 conflicts may feel aggrieved by the International Criminal Court’s discontinuance of all Kenya cases without having found the suspects either culpable or non-culpable. Neither did the suspects benefit from acquittals. Unprecedentedly, Ruto and Sang’s charges were vacated at half-time. Cases against other suspects were withdrawn. Given the circumstances which led to the ICC’s intervention in the Kenyan situation, this paper argues that in lieu of either quantitative or qualitative studies, arguments of various proxy approaches for evaluating judicial performance, are problematic. Neither judicial independence, rule-compliance, community of purpose, nor even institutional design, adequately measure judicial performance. Besides interrogating limitations of using such proxies, the paper appraises the merits of constructing a modified version of the goal-based approach. It will demonstrate that by incorporating both process-oriented as well as strategic constituency models, a more dynamic evaluative methodology can be developed for measuring the ICC’s performance in the Kenya cases.
- Full Text: false
- Authors: Juma, Laurence , Khamala, C A
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125241 , vital:35749 , https://hdl.handle.net/10520/EJC-e9dcefddf
- Description: Victims of crimes against humanity perpetrated during Kenya’s post-2007 conflicts may feel aggrieved by the International Criminal Court’s discontinuance of all Kenya cases without having found the suspects either culpable or non-culpable. Neither did the suspects benefit from acquittals. Unprecedentedly, Ruto and Sang’s charges were vacated at half-time. Cases against other suspects were withdrawn. Given the circumstances which led to the ICC’s intervention in the Kenyan situation, this paper argues that in lieu of either quantitative or qualitative studies, arguments of various proxy approaches for evaluating judicial performance, are problematic. Neither judicial independence, rule-compliance, community of purpose, nor even institutional design, adequately measure judicial performance. Besides interrogating limitations of using such proxies, the paper appraises the merits of constructing a modified version of the goal-based approach. It will demonstrate that by incorporating both process-oriented as well as strategic constituency models, a more dynamic evaluative methodology can be developed for measuring the ICC’s performance in the Kenya cases.
- Full Text: false
A history of the Grahamstown Teachers’ Training College 1894-1975
- Authors: Kelly, Leonard Eric
- Date: 2017
- Subjects: Grahamstown Teachers' Training College , Teachers -- Training of -- South Africa -- Makhanda -- History , Universities and colleges -- South Africa -- Makhanda -- History
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7903 , vital:21322
- Description: In the Cape Colony, and then in South Africa generally, the twentieth century was to see the emergence, growth, and final closure of teacher training colleges. South Africa was one of the few Anglophone countries on the African Continent which, in 2003, did not have a separate and dedicated system of Teacher Education Colleges.1 From the 1920s on, there was a spirited debate over whether primary school teacher training was better achieved in the training college or the university. The publication of the National Education Amendment Act (No 73 of 1969) finally placed all teacher training, primary/elementary and secondary, within University Faculties of Education. The present study investigates the history of the Grahamstown Teacher Training College (GTTC) which was officially recognised in 1894 for the training of young white women. The GTTC was an independent college, founded and owned by an Anglican Religious Community for women, the Community of the Resurrection of Our Lord (CR), but it was also an Aided College of the Cape Education Department. As an Aided College, the GTTC was subject to Government Inspection annually, and the students wrote the official examinations set by the Department of Education. The College was run entirely by women and existed for 81 years. The emphasis in the college was on the practical professional training offered. The focus was on the ‘complete’ education of the student, rather than merely on the content of the curriculum. This study shows that the GTTC more than earned its reputation of being one of the finest training colleges in South Africa and that it was indeed a unique educational development. A feature of particular note was that the college was a trail-blazer, a pioneer in the field of education practices. It was the first college to introduce class music and class singing, the first to employ a physical education teacher, to have a full-time librarian and elocutionist, and it was at the GTTC that the assignment method of study was introduced. All these factors are highlighted in the course of this study.
- Full Text:
- Authors: Kelly, Leonard Eric
- Date: 2017
- Subjects: Grahamstown Teachers' Training College , Teachers -- Training of -- South Africa -- Makhanda -- History , Universities and colleges -- South Africa -- Makhanda -- History
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7903 , vital:21322
- Description: In the Cape Colony, and then in South Africa generally, the twentieth century was to see the emergence, growth, and final closure of teacher training colleges. South Africa was one of the few Anglophone countries on the African Continent which, in 2003, did not have a separate and dedicated system of Teacher Education Colleges.1 From the 1920s on, there was a spirited debate over whether primary school teacher training was better achieved in the training college or the university. The publication of the National Education Amendment Act (No 73 of 1969) finally placed all teacher training, primary/elementary and secondary, within University Faculties of Education. The present study investigates the history of the Grahamstown Teacher Training College (GTTC) which was officially recognised in 1894 for the training of young white women. The GTTC was an independent college, founded and owned by an Anglican Religious Community for women, the Community of the Resurrection of Our Lord (CR), but it was also an Aided College of the Cape Education Department. As an Aided College, the GTTC was subject to Government Inspection annually, and the students wrote the official examinations set by the Department of Education. The College was run entirely by women and existed for 81 years. The emphasis in the college was on the practical professional training offered. The focus was on the ‘complete’ education of the student, rather than merely on the content of the curriculum. This study shows that the GTTC more than earned its reputation of being one of the finest training colleges in South Africa and that it was indeed a unique educational development. A feature of particular note was that the college was a trail-blazer, a pioneer in the field of education practices. It was the first college to introduce class music and class singing, the first to employ a physical education teacher, to have a full-time librarian and elocutionist, and it was at the GTTC that the assignment method of study was introduced. All these factors are highlighted in the course of this study.
- Full Text:
A holistic investigation of amateur batters performance responses to a century protocol: a focused cognitive perspective
- Authors: Goble, David
- Date: 2017
- Subjects: Cricket -- Batting -- Physiological aspects , Cricket players -- Physiology , Cricket players -- Health and hygiene , Cognition -- Testing , Neurophysiology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/40725 , vital:25020
- Description: No cognitive study has implemented an exercise modality that requires both physical effort and cognitive control, therefore, the effects of such exercise are unknown. Additionally, no studies have investigated how prolonged batting impacts cognitive functioning nor how physical responses and cognitive functioning are related while batting. At intensities of 6070 percent heart rate maximum, acute and prolonged bouts of physical activity have been shown to improve cognitive functioning. At higher intensities, the beneficial effects are minimal and in some cases performance is impaired. Therefore, the aim of this investigation was to determine how prolonged intermittent batting (a task that requires high muscular and cardiovascular loads but also continuous cognitive control) affects cognitive, physiological, physical and biophysical responses in amateur batters. Further aims included to test the reliability of the method employed in assessing these responses. To answer this question, the investigation was separated into three studies: phase 1 (a large-scale pilot) and phase 2 and 3 (a repeated measures test-retest hypothesis). In each phase, batters completed the 30 over BATEX simulation, which replicated the demands of scoring a one-day international century. To establish physiological, physical and perceptual strain; heart rate, sprint times and perceived exertion data were collected each over. Changes in body mass over time were compared to determine the effects of fluid loss on cognitive performance. Before, during and after the simulation, psychomotor function, visual attention, working memory, visual learning and memory as well as executive functions were assessed (CogState brief test battery). During cognitive assessments, heart rate and heart rate variability parameters were sampled so that autonomic modulation of the heart could be determined. The methodological differences between phase 1 and phase 2 and 3, were (respectively); the frequency of cognitive assessments (five vs. three), the samples used (15 schoolboy vs. 16 academy batters), hydration protocols (250ml of Energade vs. water ad libitum) and a singular change in a physical dependent variable (batting accuracy vs. vertical jump). In schoolboy and academy batters, the prolonged batting simulation placed significant strain on the cardiovascular and muscular subsystems; increasing heart rate (p<0.01), decreasing body mass (p<0.01) and deteriorating sprint performance (p<0.01) over time. In each sample, batters’ perceived exertion increased significantly (p<0.01) and exertion was highest in the final over of the protocol. Interestingly, the changes in cardiovascular and muscular responses were larger in schoolboy batters. While the cognitive performance decrements over time were not significant in academy batters (p>0.05; d<0.2), the magnitude of impairment in psychomotor function (p>0.05; d = 0.37), visual attention (p>0.05; d = 0.56), working memory (p>0.05; d = 0.61) and executive function (p>0.05; d = 0.58) was larger in schoolboy batters. In both samples, the simulation altered the modulation of heart rate significantly. Heart rate variability decreased linearly with time spent batting (p<0.01; d>0.8). During cognitive assessments, heart rate variability increased with time-on-task, where responses were significantly higher (p<0.05) in the last task of the battery compared to the first. Importantly, the results of the retest phase were the same as in the test phase and only two condition effects were observed; (i) heart rate (retest lower: p<0.04;d = 0.39), (ii) body mass (retest lower: p<0.03;d = 0.09). A task-related condition effect in heart rate variability (PNN30) was also observed (retest higher: p<0.03; d = not calculated). Resultantly, the test-retest reliability of phase 2 and 3 was high. The results indicate that prolonged intermittent batting at an intensity of 64-77 %HRmax impaired cognitive functioning in amateur batters. However, the cardiovascular and muscular strain induced by prolonged intermittent batting and its effects on cognitive functioning are mediated by intrinsic and extrinsic factors (age, training status, playing experience and hydration). Therefore, while prolonged batting has similar effects on cognitive functioning as acute bouts of physical activity, they do not share the same relationship. The author hypothesises that the continuous cognitive component inherent in prolonged batting mitigates the beneficial effects of physical activity, as demonstrated previously. Future research is needed to elucidate this relationship. Additionally, player experience affects the way in which batters regulate performance while batting; which also affects the rate of and magnitude of impairment during batting. Finally, the methodological limitations of this study provide direction for future research into batting.
- Full Text:
- Authors: Goble, David
- Date: 2017
- Subjects: Cricket -- Batting -- Physiological aspects , Cricket players -- Physiology , Cricket players -- Health and hygiene , Cognition -- Testing , Neurophysiology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/40725 , vital:25020
- Description: No cognitive study has implemented an exercise modality that requires both physical effort and cognitive control, therefore, the effects of such exercise are unknown. Additionally, no studies have investigated how prolonged batting impacts cognitive functioning nor how physical responses and cognitive functioning are related while batting. At intensities of 6070 percent heart rate maximum, acute and prolonged bouts of physical activity have been shown to improve cognitive functioning. At higher intensities, the beneficial effects are minimal and in some cases performance is impaired. Therefore, the aim of this investigation was to determine how prolonged intermittent batting (a task that requires high muscular and cardiovascular loads but also continuous cognitive control) affects cognitive, physiological, physical and biophysical responses in amateur batters. Further aims included to test the reliability of the method employed in assessing these responses. To answer this question, the investigation was separated into three studies: phase 1 (a large-scale pilot) and phase 2 and 3 (a repeated measures test-retest hypothesis). In each phase, batters completed the 30 over BATEX simulation, which replicated the demands of scoring a one-day international century. To establish physiological, physical and perceptual strain; heart rate, sprint times and perceived exertion data were collected each over. Changes in body mass over time were compared to determine the effects of fluid loss on cognitive performance. Before, during and after the simulation, psychomotor function, visual attention, working memory, visual learning and memory as well as executive functions were assessed (CogState brief test battery). During cognitive assessments, heart rate and heart rate variability parameters were sampled so that autonomic modulation of the heart could be determined. The methodological differences between phase 1 and phase 2 and 3, were (respectively); the frequency of cognitive assessments (five vs. three), the samples used (15 schoolboy vs. 16 academy batters), hydration protocols (250ml of Energade vs. water ad libitum) and a singular change in a physical dependent variable (batting accuracy vs. vertical jump). In schoolboy and academy batters, the prolonged batting simulation placed significant strain on the cardiovascular and muscular subsystems; increasing heart rate (p<0.01), decreasing body mass (p<0.01) and deteriorating sprint performance (p<0.01) over time. In each sample, batters’ perceived exertion increased significantly (p<0.01) and exertion was highest in the final over of the protocol. Interestingly, the changes in cardiovascular and muscular responses were larger in schoolboy batters. While the cognitive performance decrements over time were not significant in academy batters (p>0.05; d<0.2), the magnitude of impairment in psychomotor function (p>0.05; d = 0.37), visual attention (p>0.05; d = 0.56), working memory (p>0.05; d = 0.61) and executive function (p>0.05; d = 0.58) was larger in schoolboy batters. In both samples, the simulation altered the modulation of heart rate significantly. Heart rate variability decreased linearly with time spent batting (p<0.01; d>0.8). During cognitive assessments, heart rate variability increased with time-on-task, where responses were significantly higher (p<0.05) in the last task of the battery compared to the first. Importantly, the results of the retest phase were the same as in the test phase and only two condition effects were observed; (i) heart rate (retest lower: p<0.04;d = 0.39), (ii) body mass (retest lower: p<0.03;d = 0.09). A task-related condition effect in heart rate variability (PNN30) was also observed (retest higher: p<0.03; d = not calculated). Resultantly, the test-retest reliability of phase 2 and 3 was high. The results indicate that prolonged intermittent batting at an intensity of 64-77 %HRmax impaired cognitive functioning in amateur batters. However, the cardiovascular and muscular strain induced by prolonged intermittent batting and its effects on cognitive functioning are mediated by intrinsic and extrinsic factors (age, training status, playing experience and hydration). Therefore, while prolonged batting has similar effects on cognitive functioning as acute bouts of physical activity, they do not share the same relationship. The author hypothesises that the continuous cognitive component inherent in prolonged batting mitigates the beneficial effects of physical activity, as demonstrated previously. Future research is needed to elucidate this relationship. Additionally, player experience affects the way in which batters regulate performance while batting; which also affects the rate of and magnitude of impairment during batting. Finally, the methodological limitations of this study provide direction for future research into batting.
- Full Text:
A meteorological analysis of extreme flood events in the southern parts of the Eastern Cape, South Africa
- Authors: Jacobs, Tennielle Lindsay
- Date: 2017
- Subjects: Floods -- South Africa -- Eastern Cape , Floods -- South Africa -- Eastern Cape -- Cast studies , Lows (Meteorology) -- South Africa -- Eastern Cape , Rain and rainfall -- South Africa -- Eastern Cape , Rainfall anomalies -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/50525 , vital:25996
- Description: Extreme flood events have been found to occur in the Eastern Cape Province of South Africa. The southern and south-eastern coastal regions are particularly susceptible to floods with daily rainfall records of up to 490 mm having been recorded here. In order to gain a better understanding of these floods, historical floods in the southern parts of the Eastern Cape have been analysed in this study. This study aimed to investigate the most extreme flood events in the history of the area and to analyse the surface observational data during the heavy rainfall events found, to contribute to the understanding of these heavy rainfall events. Seven case studies were investigated using NCEP/NCAR Reanalysis 1 data and surface observational data, to analysis the synoptic circulation and surface data tendencies during heavy rainfall events. All of the case studies that had synoptic data available showed to have a COL system present with the upper air low lying westward of the flood area. The surface synoptic situation presented an intense high pressure system lying south west or south of the country in the Atlantic Ocean between 35-45°S. Another key factor was a surface trough over the interior of the country, due to the COL, extending southwards to protrude off of the south or south eastern coastline east of the flood areas. The combination of these three systems colloquially referred to as a “Black South-Easter”, produced dangerous rainfall intensities when the winds were perpendicular to the coast. The results of the surface observations revealed temperatures increasing at night (against diurnal cycles) with increasing relative humidity preceding the heavy rainfall events. The pressure showed both increasing and decreasing trends during heavy rainfall events however in five of six cases a tight pressure gradient was present producing an influx of moist air into the flood area. Onshore winds were found to be of high importance in heavy rainfall events to bring moist air into the area. Wind speeds greater than 5m/s occurred during times of high rainfall intensities.
- Full Text:
- Authors: Jacobs, Tennielle Lindsay
- Date: 2017
- Subjects: Floods -- South Africa -- Eastern Cape , Floods -- South Africa -- Eastern Cape -- Cast studies , Lows (Meteorology) -- South Africa -- Eastern Cape , Rain and rainfall -- South Africa -- Eastern Cape , Rainfall anomalies -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/50525 , vital:25996
- Description: Extreme flood events have been found to occur in the Eastern Cape Province of South Africa. The southern and south-eastern coastal regions are particularly susceptible to floods with daily rainfall records of up to 490 mm having been recorded here. In order to gain a better understanding of these floods, historical floods in the southern parts of the Eastern Cape have been analysed in this study. This study aimed to investigate the most extreme flood events in the history of the area and to analyse the surface observational data during the heavy rainfall events found, to contribute to the understanding of these heavy rainfall events. Seven case studies were investigated using NCEP/NCAR Reanalysis 1 data and surface observational data, to analysis the synoptic circulation and surface data tendencies during heavy rainfall events. All of the case studies that had synoptic data available showed to have a COL system present with the upper air low lying westward of the flood area. The surface synoptic situation presented an intense high pressure system lying south west or south of the country in the Atlantic Ocean between 35-45°S. Another key factor was a surface trough over the interior of the country, due to the COL, extending southwards to protrude off of the south or south eastern coastline east of the flood areas. The combination of these three systems colloquially referred to as a “Black South-Easter”, produced dangerous rainfall intensities when the winds were perpendicular to the coast. The results of the surface observations revealed temperatures increasing at night (against diurnal cycles) with increasing relative humidity preceding the heavy rainfall events. The pressure showed both increasing and decreasing trends during heavy rainfall events however in five of six cases a tight pressure gradient was present producing an influx of moist air into the flood area. Onshore winds were found to be of high importance in heavy rainfall events to bring moist air into the area. Wind speeds greater than 5m/s occurred during times of high rainfall intensities.
- Full Text:
A moderate elevation in [CO 2] results in potential hypervirulence on SABBIErica
- Gallagher, Sean, Hill, Jaclyn M, Murugan, N, Botha, Christiaan E J
- Authors: Gallagher, Sean , Hill, Jaclyn M , Murugan, N , Botha, Christiaan E J
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68835 , vital:29329 , https://doi.org/10.1016/j.sajb.2017.10.010
- Description: The Russian Wheat Aphid (Diuraphis noxia Kurdjumov, 1913) (RWA) is a serious pest of grain crops and is of considerable concern in South Africa, particularly in terms of barley grown specifically for the brewing industry. This paper highlights the effect of a small (50 ppm) increase in [CO2] on the growth rate of the four South African RWA biotypes on the SABBIErica barley cultivar. Controlled environment experiments revealed that the colony growth rate for RWASA4 was significantly lower than SA1 under ambient conditions as well as significantly lower than SA1, SA2 or SA3 under elevated CO2 conditions. The unexpected difference suggested an atypical, non-preferential feeding habit on SABBIErica, for RWASA4. The small RWASA4 colonies inflicted similar morphological damage to the significantly larger RWASA1 – RWASA3 biotype populations — indicative of potential hypervirulence under elevated CO2. The continuous feeding of RWASA biotypes causes damage to the transport system as well as substantial, catastrophic damage to mesophyll chloroplasts as well as mitochondria within the host plant's leaves. The TEM study revealed evidence of sequential/systematic degeneration of chloroplasts and mitochondria with continued aphid feeding, which we suggest is an indication of potential emergent hypervirulence under elevated CO2 conditions.
- Full Text: false
- Authors: Gallagher, Sean , Hill, Jaclyn M , Murugan, N , Botha, Christiaan E J
- Date: 2017
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68835 , vital:29329 , https://doi.org/10.1016/j.sajb.2017.10.010
- Description: The Russian Wheat Aphid (Diuraphis noxia Kurdjumov, 1913) (RWA) is a serious pest of grain crops and is of considerable concern in South Africa, particularly in terms of barley grown specifically for the brewing industry. This paper highlights the effect of a small (50 ppm) increase in [CO2] on the growth rate of the four South African RWA biotypes on the SABBIErica barley cultivar. Controlled environment experiments revealed that the colony growth rate for RWASA4 was significantly lower than SA1 under ambient conditions as well as significantly lower than SA1, SA2 or SA3 under elevated CO2 conditions. The unexpected difference suggested an atypical, non-preferential feeding habit on SABBIErica, for RWASA4. The small RWASA4 colonies inflicted similar morphological damage to the significantly larger RWASA1 – RWASA3 biotype populations — indicative of potential hypervirulence under elevated CO2. The continuous feeding of RWASA biotypes causes damage to the transport system as well as substantial, catastrophic damage to mesophyll chloroplasts as well as mitochondria within the host plant's leaves. The TEM study revealed evidence of sequential/systematic degeneration of chloroplasts and mitochondria with continued aphid feeding, which we suggest is an indication of potential emergent hypervirulence under elevated CO2 conditions.
- Full Text: false
A narrative, child-participatory study of domestic mobility within grandmother-headed households in the Eastern Cape, South Africa
- Authors: Lotter, Jaclyn Oehley
- Date: 2017
- Subjects: Women heads of households South Africa Eastern Cape , Poor women South Africa Eastern Cape , Migration, Internal South Africa , Poverty South Africa , HIV infections Social aspects South Africa , HIV infections Economic aspects South Africa , AIDS (Disease) Social aspects South Africa , AIDS (Disease) Economic aspects South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7678 , vital:21285
- Description: The movement of adults and children between households in South Africa is a tradition entrenched by apartheid state policies and fuelled by poverty and HIV/AIDS. Children affected by domestic mobility include not only orphans, but those whose families are struggling financially or are deprived of income through illness or death. One example of domestic mobility is the redistribution of children through grandmother-headed households. While domestic mobility has been researched from a number of different academic perspectives, there is scanty psychological literature on the subject, and a gap around children’s experiences of their own mobility. Children’s roles and agency in their mobility, and how these are shaped by their environments, social relations and resilience, are not considered. This research aimed to explore the meanings that domestic mobility had in the lives, identity constructions and personal narratives of South African children currently residing in grandmother-headed households in the Eastern Cape. This was achieved through a narrative approach, interested in big life-stories, as well as small stories of everyday interaction. Over the course of two years, five child participants aged between eight and 12 years constructed narrative material through participatory action research methodologies, including the mapping of time-lines and their lived environments, and photovoice. Child participants and their families were selected from the client-base of a non-governmental organisation, Isibindi (Alice). Narratives were analysed as case studies to tell detailed stories of children’s lives, and to comment on issues associated with domestic mobility, socio-economic status, gender, education, HIV/AIDS and social protection. The study found that blanket definitions of poverty and domestic mobility conceal important variations in levels of poverty and individual experiences of mobility. While children are excluded from processes of decision-making about their mobility, they perform their agency by contributing to household survival and ensuring the continuation of mutually beneficial attachment relationships. This research argues that interventions which act on various systemic levels (macro, meso and exo) add support and protection for vulnerable children. This research also argues for psychological “scaffolding” of potentially traumatic or precarious processes, such as domestic mobility and deaths in families, through caregivers preparing and consulting with children before events happen.
- Full Text:
- Authors: Lotter, Jaclyn Oehley
- Date: 2017
- Subjects: Women heads of households South Africa Eastern Cape , Poor women South Africa Eastern Cape , Migration, Internal South Africa , Poverty South Africa , HIV infections Social aspects South Africa , HIV infections Economic aspects South Africa , AIDS (Disease) Social aspects South Africa , AIDS (Disease) Economic aspects South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/7678 , vital:21285
- Description: The movement of adults and children between households in South Africa is a tradition entrenched by apartheid state policies and fuelled by poverty and HIV/AIDS. Children affected by domestic mobility include not only orphans, but those whose families are struggling financially or are deprived of income through illness or death. One example of domestic mobility is the redistribution of children through grandmother-headed households. While domestic mobility has been researched from a number of different academic perspectives, there is scanty psychological literature on the subject, and a gap around children’s experiences of their own mobility. Children’s roles and agency in their mobility, and how these are shaped by their environments, social relations and resilience, are not considered. This research aimed to explore the meanings that domestic mobility had in the lives, identity constructions and personal narratives of South African children currently residing in grandmother-headed households in the Eastern Cape. This was achieved through a narrative approach, interested in big life-stories, as well as small stories of everyday interaction. Over the course of two years, five child participants aged between eight and 12 years constructed narrative material through participatory action research methodologies, including the mapping of time-lines and their lived environments, and photovoice. Child participants and their families were selected from the client-base of a non-governmental organisation, Isibindi (Alice). Narratives were analysed as case studies to tell detailed stories of children’s lives, and to comment on issues associated with domestic mobility, socio-economic status, gender, education, HIV/AIDS and social protection. The study found that blanket definitions of poverty and domestic mobility conceal important variations in levels of poverty and individual experiences of mobility. While children are excluded from processes of decision-making about their mobility, they perform their agency by contributing to household survival and ensuring the continuation of mutually beneficial attachment relationships. This research argues that interventions which act on various systemic levels (macro, meso and exo) add support and protection for vulnerable children. This research also argues for psychological “scaffolding” of potentially traumatic or precarious processes, such as domestic mobility and deaths in families, through caregivers preparing and consulting with children before events happen.
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