Effect of grazing systems on growth performance, carcass characteristic, meat quality of beef cattle and economic performance of the enterprise
- Authors: Dayimani, Siyavuya
- Date: 2019
- Subjects: Grazing -- Environmental aspects Meat -- Quality
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/17294 , vital:40873
- Description: Under conditions of adaptive Holistic Management™, we tested whether rotational grazing approaches such as holistic planned grazing (HPG) and four-camp grazing (FCG) influence growth, carcass and meat quality attributes of beef steers compared to continuous, seasonlong (SLG) grazing. Thirty steers (250 ±19.56 kg, 16-17-month-old) were randomly assigned to SLG, HPG and FCG systems (10 steers/ treatment) at a private farm in Cedarville, Eastern Cape Province, South Africa where grazing was managed using an adaptive approach involving inter alia planned grazing charts, seasonal movement of cattle, and supplemental feeding. The steers were slaughtered at 40-41 months for carcass measurements and longissimus et lumborum was sampled for meat quality analyses. All the grazing systems had comparable live weights and average daily gain. All the investigated carcass attributes were also similar across grazing treatments (P > 0.05). Meat from steers on the SLG system had higher (P<0.05) drip loss, protein and fat contents and lower (P <0.05) shear force, moisture and ash contents than the two rotational grazing approaches (HPG and FCG). The HPG had higher (P < 0.05) total running and capital costs compared to SLG and FCG grazing systems. The SLG system had greater (P ≤ 0.05) gross and net income compared to FCG and HPG systems, respectively. Overall, all the grazing systems had comparable growth performance, carcass characteristics and meat quality but rotational grazing systems had lower gross income relative to the SLG grazing system.
- Full Text:
- Date Issued: 2019
- Authors: Dayimani, Siyavuya
- Date: 2019
- Subjects: Grazing -- Environmental aspects Meat -- Quality
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/17294 , vital:40873
- Description: Under conditions of adaptive Holistic Management™, we tested whether rotational grazing approaches such as holistic planned grazing (HPG) and four-camp grazing (FCG) influence growth, carcass and meat quality attributes of beef steers compared to continuous, seasonlong (SLG) grazing. Thirty steers (250 ±19.56 kg, 16-17-month-old) were randomly assigned to SLG, HPG and FCG systems (10 steers/ treatment) at a private farm in Cedarville, Eastern Cape Province, South Africa where grazing was managed using an adaptive approach involving inter alia planned grazing charts, seasonal movement of cattle, and supplemental feeding. The steers were slaughtered at 40-41 months for carcass measurements and longissimus et lumborum was sampled for meat quality analyses. All the grazing systems had comparable live weights and average daily gain. All the investigated carcass attributes were also similar across grazing treatments (P > 0.05). Meat from steers on the SLG system had higher (P<0.05) drip loss, protein and fat contents and lower (P <0.05) shear force, moisture and ash contents than the two rotational grazing approaches (HPG and FCG). The HPG had higher (P < 0.05) total running and capital costs compared to SLG and FCG grazing systems. The SLG system had greater (P ≤ 0.05) gross and net income compared to FCG and HPG systems, respectively. Overall, all the grazing systems had comparable growth performance, carcass characteristics and meat quality but rotational grazing systems had lower gross income relative to the SLG grazing system.
- Full Text:
- Date Issued: 2019
Measuring the industry maturity of the South African export table grape industry
- Authors: De Bruyn, Corean
- Date: 2019
- Subjects: Exports -- South Africa , Fruit trade -- South Africa Agriculture -- Economic aspects -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39403 , vital:35243
- Description: Despite the fact that the South African export table grape industry is more than a century old, studies which focus on the development of the industry have not previously been conducted. The main aim of this study was to measure the phase of maturity of the South African export table grape industry. The industry life cycle model was a main focus point to measure the maturity of the South African export table grape industry and as such has been used to analyse the dynamics of the South African export table grape industry. An expansive literature study was conducted to identify as many variables as possible that serve as indicators of the phase of maturity. A measuring instrument, in the form of a questionnaire, was developed, based on these identified variables. A randomly selected sample of 214 export table grape producers completed the questionnaire. Five main export table grape regions are present in South Africa, namely, the Hex River Valley region, the Berg River region, the Olifants River region, the Orange River region and the Northern Province region. An exploratory factor analysis was used to disentangle and reduce the large number of variables. From the factor analysis, four distinct factors emerged, namely: Manufacturing and Distribution, Demand, Research and Development, and Buyer Segments. Cronbach’s coefficient alpha was employed to confirm the reliability and internal consistency of the measuring instrument. The mean scores and standard deviations were used to determine the strength of direction of each of the four variables, followed by a t-test to determine the differences in development between the five regions. Finally, the Pearson’s Product Moment Correlations were calculated for investigating the correlations between the variables used. The findings indicated that, among the five-export table grape regions in South Africa, Manufacturing and Distribution have evolved beyond the introductory phase, but that there is still considerable scope for growth in all the regions. Additionally, there are significant differences between the five regions, thereby indicating that the industry exhibits uneven development with some of the regions being further along the path of development. Demand delivered the second highest mean score and the smallest variation among the five regions. This indicates that export table grapes from South African producers have a loyal customer base. The mean score, however, still indicated that the industry as a whole is in the growth phase of development. Research and Development delivered the highest mean score, thereby signifying the industry’s commitment to research and development. This once again points to an industry being in the growth phase of development. The average mean score delivered by Buyer Segments indicates that the market has begun to fragment. This provides opportunities to create and exploit niche marks. This too conforms to the characteristics of the growth phase in the industry life cycle model. In essence, the current study provided useful information regarding the evolution of the South African export table grape industry. Moreover, a foundation has been laid for further research to be conducted in the industry life cycle of the South African export table grape industry.
- Full Text:
- Date Issued: 2019
- Authors: De Bruyn, Corean
- Date: 2019
- Subjects: Exports -- South Africa , Fruit trade -- South Africa Agriculture -- Economic aspects -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39403 , vital:35243
- Description: Despite the fact that the South African export table grape industry is more than a century old, studies which focus on the development of the industry have not previously been conducted. The main aim of this study was to measure the phase of maturity of the South African export table grape industry. The industry life cycle model was a main focus point to measure the maturity of the South African export table grape industry and as such has been used to analyse the dynamics of the South African export table grape industry. An expansive literature study was conducted to identify as many variables as possible that serve as indicators of the phase of maturity. A measuring instrument, in the form of a questionnaire, was developed, based on these identified variables. A randomly selected sample of 214 export table grape producers completed the questionnaire. Five main export table grape regions are present in South Africa, namely, the Hex River Valley region, the Berg River region, the Olifants River region, the Orange River region and the Northern Province region. An exploratory factor analysis was used to disentangle and reduce the large number of variables. From the factor analysis, four distinct factors emerged, namely: Manufacturing and Distribution, Demand, Research and Development, and Buyer Segments. Cronbach’s coefficient alpha was employed to confirm the reliability and internal consistency of the measuring instrument. The mean scores and standard deviations were used to determine the strength of direction of each of the four variables, followed by a t-test to determine the differences in development between the five regions. Finally, the Pearson’s Product Moment Correlations were calculated for investigating the correlations between the variables used. The findings indicated that, among the five-export table grape regions in South Africa, Manufacturing and Distribution have evolved beyond the introductory phase, but that there is still considerable scope for growth in all the regions. Additionally, there are significant differences between the five regions, thereby indicating that the industry exhibits uneven development with some of the regions being further along the path of development. Demand delivered the second highest mean score and the smallest variation among the five regions. This indicates that export table grapes from South African producers have a loyal customer base. The mean score, however, still indicated that the industry as a whole is in the growth phase of development. Research and Development delivered the highest mean score, thereby signifying the industry’s commitment to research and development. This once again points to an industry being in the growth phase of development. The average mean score delivered by Buyer Segments indicates that the market has begun to fragment. This provides opportunities to create and exploit niche marks. This too conforms to the characteristics of the growth phase in the industry life cycle model. In essence, the current study provided useful information regarding the evolution of the South African export table grape industry. Moreover, a foundation has been laid for further research to be conducted in the industry life cycle of the South African export table grape industry.
- Full Text:
- Date Issued: 2019
In Parenthesis:
- Authors: de Jager, Maureen
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147880 , vital:38681 , DOI: 10.1080/02560046.2019.1684966
- Description: IN PARENTHESIS is a practice-based essay which takes shape, parasitically, amidst the “found text” of an existing book, British author Thomas Pakenham's The Boer War (1979, Johannesburg: Jonathan Ball). The “author-reader” interjects into the found text of this authoritative history book, inserting her words amongst those of Pakenham's. What becomes apparent, however, is that the text into which she interjects is not The Boer War verbatim, but a dramatically abridged version. The book's primary content has been edited out. What remains is The Boer War whittled down to a litany of Pakenham's parentheses (the history book distilled into an essence of the seemingly non-essential). Into this stream of bracketed matter, the author-reader writes, ruminating on the parenthesis as ethos (as prison and portal, barricade and breach, enclave and embrace). In turn, her ruminations invite reflection on the conundrum of writing history, of writing this history (and, indeed, of writing per se).
- Full Text:
- Date Issued: 2019
- Authors: de Jager, Maureen
- Date: 2019
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147880 , vital:38681 , DOI: 10.1080/02560046.2019.1684966
- Description: IN PARENTHESIS is a practice-based essay which takes shape, parasitically, amidst the “found text” of an existing book, British author Thomas Pakenham's The Boer War (1979, Johannesburg: Jonathan Ball). The “author-reader” interjects into the found text of this authoritative history book, inserting her words amongst those of Pakenham's. What becomes apparent, however, is that the text into which she interjects is not The Boer War verbatim, but a dramatically abridged version. The book's primary content has been edited out. What remains is The Boer War whittled down to a litany of Pakenham's parentheses (the history book distilled into an essence of the seemingly non-essential). Into this stream of bracketed matter, the author-reader writes, ruminating on the parenthesis as ethos (as prison and portal, barricade and breach, enclave and embrace). In turn, her ruminations invite reflection on the conundrum of writing history, of writing this history (and, indeed, of writing per se).
- Full Text:
- Date Issued: 2019
The integration of effluent treatment using constructed wetlands, with crop production and aquaculture
- Authors: de Jong, Martyn
- Date: 2019
- Subjects: Recycling (Waste, etc.) , Brewery waste , Sewage -- Purification , Beets , Mozambique tilapia
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/95767 , vital:31197
- Description: Breweries are major consumers of water and produce nutrient rich wastewater. Therefore, it is important to research technologies that optimise the reuse and recycling of this waste. This study compared different constructed wetlands (CWs) in terms of their potential for cleaning brewery effluent and simultaneously producing crops Beta vulgaris and fish Oreochromis mossambicus. Filling and draining times (FDT; 15 min, 30 min and 60 min) in tidal CWs were compared in Experiment 1. The 15 min FDT (6.52 ± 0.09 mg/l) and 30 min FDT (5.74 ± 0.09 mg/l) had higher dissolved oxygen (DO) than the 60 min FDT (5.40 ± 0.09 mg/l; p<0.05). This resulted in the 15 and 30 min FDT treatments reaching ammonia effluent discharge standards sooner than the 60 min FDT. Total plant harvest increased with increasing FDT; therefore, 15 min FDT was used as the FDT in tidal treatments in the following experiments. The aerated CW (5.81 ± 0.07 mg/l) and tidal CW (5.67 ± 0.07 mg/l) treatments had higher DO concentrations than the unaerated CW treatment (3.76 ± 0.07 mg/l; p<0.05) in Experiment 2. This resulted in lower ammonia concentrations on day 5 in the aerated and tidal CWs compared with the unaerated treatment (p<0.05). The tidal CW (23.97 ± 2.57 kg) had a total harvest that was approximately four times higher than the unaerated CW (p<0.05), which had the highest frequency of chlorosis and plant mortality; and was unable to treat ammonia to discharge standards. In Experiment 3, the aerated and tidal CW were compared with municipal-water as water sources for aquaculture. There were no differences in fish growth (p > 0.05). However, there were differences in water quality; with the municipal treatment having the lowest pH, EC and nitrate concentration (p<0.05); but all water quality parameters remained in a range suitably for fish production. Due to the tidal CW having the highest plant harvest and lowest frequency of chlorosis and mortality; it was the most suitable CW technology to clean the brewery effluent, and to produce B. vulgaris and water that could be used downstream in aquaculture.
- Full Text:
- Date Issued: 2019
- Authors: de Jong, Martyn
- Date: 2019
- Subjects: Recycling (Waste, etc.) , Brewery waste , Sewage -- Purification , Beets , Mozambique tilapia
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/95767 , vital:31197
- Description: Breweries are major consumers of water and produce nutrient rich wastewater. Therefore, it is important to research technologies that optimise the reuse and recycling of this waste. This study compared different constructed wetlands (CWs) in terms of their potential for cleaning brewery effluent and simultaneously producing crops Beta vulgaris and fish Oreochromis mossambicus. Filling and draining times (FDT; 15 min, 30 min and 60 min) in tidal CWs were compared in Experiment 1. The 15 min FDT (6.52 ± 0.09 mg/l) and 30 min FDT (5.74 ± 0.09 mg/l) had higher dissolved oxygen (DO) than the 60 min FDT (5.40 ± 0.09 mg/l; p<0.05). This resulted in the 15 and 30 min FDT treatments reaching ammonia effluent discharge standards sooner than the 60 min FDT. Total plant harvest increased with increasing FDT; therefore, 15 min FDT was used as the FDT in tidal treatments in the following experiments. The aerated CW (5.81 ± 0.07 mg/l) and tidal CW (5.67 ± 0.07 mg/l) treatments had higher DO concentrations than the unaerated CW treatment (3.76 ± 0.07 mg/l; p<0.05) in Experiment 2. This resulted in lower ammonia concentrations on day 5 in the aerated and tidal CWs compared with the unaerated treatment (p<0.05). The tidal CW (23.97 ± 2.57 kg) had a total harvest that was approximately four times higher than the unaerated CW (p<0.05), which had the highest frequency of chlorosis and plant mortality; and was unable to treat ammonia to discharge standards. In Experiment 3, the aerated and tidal CW were compared with municipal-water as water sources for aquaculture. There were no differences in fish growth (p > 0.05). However, there were differences in water quality; with the municipal treatment having the lowest pH, EC and nitrate concentration (p<0.05); but all water quality parameters remained in a range suitably for fish production. Due to the tidal CW having the highest plant harvest and lowest frequency of chlorosis and mortality; it was the most suitable CW technology to clean the brewery effluent, and to produce B. vulgaris and water that could be used downstream in aquaculture.
- Full Text:
- Date Issued: 2019
From ‘cleanliness is next to Godliness’ to ‘without perfect health, there is nothing’: discourses of healthy lifestyle in the construction of young adult identities in urban South Africa
- Authors: De Jong, Michelle
- Date: 2019
- Subjects: Health , Cleanliness , Social structure -- Health aspects , Health behavior , Social medicine
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/64940 , vital:28638
- Description: This research explores popular constructions of “healthiness” as individual lifestyle choices in the context of contemporary South African consumer culture, and how these constructions relate to formations of subjectivity. This is a qualitative study conducted within a social constructionist, theoretical framework. Data was collected using in-depth, semi structured interviews and are analysed using a Foucauldian inspired version of discourse analysis. A critical stance is taken towards the assumption in these discourses that their version of healthiness is always and unquestionably positive. Special attention is paid to the lifestyle and marketing media discourses appropriated in understandings of personal health through self-management, and of the optimization of health in the pursuit of well-being. The ways in which different discourses of healthiness facilitate the construction of specific identities are considered in order to untangle some of the problems created by the moralism underpinning popular consumer health discourse. How constructions of healthiness and aspirant healthy lifestyles support, and are supported by, the ideologies and practices of neoliberal capitalism are also explored. From this perspective, healthiness as lifestyle consumption choices can be seen as an ideological apparatus that produces the subjects necessary to reproduce the social order (Althusser, 2001), functioning not only positively amongst the social classes with the leisure and economic resources to pursue these options, but also negatively as victim-blaming of those who are excluded. The argument here is not that health is bad or that people should not be bothered with activities aimed at promoting good health, but that in a context where the concept of health is idealised as always positive and beneficial, the potentially harmful consequences of some of the health discourses we make use of may be occluded. This idealisation of health or ‘healthism’ may also function to divert attention away from some of the challenges to health that are not the direct result of personal behaviours and are unlikely to be remedied through individually focussed interventions, for example, inequality and inadequate access to basic resources. Six discourses which were used to construct understandings of health are analysed. These include Happiness, Freedom, Control, Care, Balance and Goodness. The ways in which these discourses played a role in constructing the kinds of subject positions which were made available to participants, and the possible implications this has, are explored in depth.
- Full Text:
- Date Issued: 2019
- Authors: De Jong, Michelle
- Date: 2019
- Subjects: Health , Cleanliness , Social structure -- Health aspects , Health behavior , Social medicine
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/64940 , vital:28638
- Description: This research explores popular constructions of “healthiness” as individual lifestyle choices in the context of contemporary South African consumer culture, and how these constructions relate to formations of subjectivity. This is a qualitative study conducted within a social constructionist, theoretical framework. Data was collected using in-depth, semi structured interviews and are analysed using a Foucauldian inspired version of discourse analysis. A critical stance is taken towards the assumption in these discourses that their version of healthiness is always and unquestionably positive. Special attention is paid to the lifestyle and marketing media discourses appropriated in understandings of personal health through self-management, and of the optimization of health in the pursuit of well-being. The ways in which different discourses of healthiness facilitate the construction of specific identities are considered in order to untangle some of the problems created by the moralism underpinning popular consumer health discourse. How constructions of healthiness and aspirant healthy lifestyles support, and are supported by, the ideologies and practices of neoliberal capitalism are also explored. From this perspective, healthiness as lifestyle consumption choices can be seen as an ideological apparatus that produces the subjects necessary to reproduce the social order (Althusser, 2001), functioning not only positively amongst the social classes with the leisure and economic resources to pursue these options, but also negatively as victim-blaming of those who are excluded. The argument here is not that health is bad or that people should not be bothered with activities aimed at promoting good health, but that in a context where the concept of health is idealised as always positive and beneficial, the potentially harmful consequences of some of the health discourses we make use of may be occluded. This idealisation of health or ‘healthism’ may also function to divert attention away from some of the challenges to health that are not the direct result of personal behaviours and are unlikely to be remedied through individually focussed interventions, for example, inequality and inadequate access to basic resources. Six discourses which were used to construct understandings of health are analysed. These include Happiness, Freedom, Control, Care, Balance and Goodness. The ways in which these discourses played a role in constructing the kinds of subject positions which were made available to participants, and the possible implications this has, are explored in depth.
- Full Text:
- Date Issued: 2019
The design of a building linking central and the Baakens river mouth
- Authors: De Klerk, Paul
- Date: 2019
- Subjects: Architecture -- South Africa -- Port Elizabeth -- 21st century , Urban renewal -- South Africa -- Port Elizabeth , Architecture -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MArch
- Identifier: http://hdl.handle.net/10948/43138 , vital:36746
- Description: This treatsie focuses around the reationship of the Baakens Valley and the historical core and their respective declined states that has been affected through shifts in urban development and urban sprawl. Urban centres are moving away from the core decentralizing activity affecting the central areas allowing people-orientated environments to decline as an outcome of urbanism. Settlement expansion was forced along the coast due to topography Decentralised city growth with urban sprawl far from the historical core. New centres developed within residential realms detracted from people returning to the historical core Increased major arterial routes diminished density through vehicular orientated living spaces vs the density of the historical core orientated to the pedestian and mixed use activity City centre deteriorated due to Urban expansion and activity centres leaving the CBD resulting in a dilapidated city core.
- Full Text:
- Date Issued: 2019
- Authors: De Klerk, Paul
- Date: 2019
- Subjects: Architecture -- South Africa -- Port Elizabeth -- 21st century , Urban renewal -- South Africa -- Port Elizabeth , Architecture -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MArch
- Identifier: http://hdl.handle.net/10948/43138 , vital:36746
- Description: This treatsie focuses around the reationship of the Baakens Valley and the historical core and their respective declined states that has been affected through shifts in urban development and urban sprawl. Urban centres are moving away from the core decentralizing activity affecting the central areas allowing people-orientated environments to decline as an outcome of urbanism. Settlement expansion was forced along the coast due to topography Decentralised city growth with urban sprawl far from the historical core. New centres developed within residential realms detracted from people returning to the historical core Increased major arterial routes diminished density through vehicular orientated living spaces vs the density of the historical core orientated to the pedestian and mixed use activity City centre deteriorated due to Urban expansion and activity centres leaving the CBD resulting in a dilapidated city core.
- Full Text:
- Date Issued: 2019
Job satisfaction and workplace stress of public service staff in the Eastern and Western Cape of South Africa
- De Koning, Divan, Van Niekerk, Roelf
- Authors: De Koning, Divan , Van Niekerk, Roelf
- Date: 2019
- Subjects: Job stress , Job satisfaction -- South Africa -- Eastern Cape Job satisfaction -- South Africa -- Western Cape. Public service employment -- South Africa -- Eastern Cape Public service employment -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/39414 , vital:35244
- Description: The aim of the study was to measure and explore the job satisfaction and workplace stress levels of public service staff within the Eastern and Western Cape of South Africa, as well as to establish the extent of the relationship between the areas of job satisfaction and workplace stress. The measure was predominantly administered to staff that the researcher came into contact with as a result of psychometric assessments that their employer required them to complete. The researcher facilitated the role of a service provider to the public service entities and utilised this opportunity to encourage staff to complete the measure. The measure covered five job satisfaction and seven workplace stress variables. 230 staff members completed the measure of which 170 was deemed to be useable. A quantitative study thereby enabling the investigation into the potential sources of job dissatisfaction and workplace stress was conducted. Eight hypotheses had been formulated in order to facilitate the comparisons and had been informed by prior research. The quantitative analysis established that both of the sections in the measure (job satisfaction and workplace stress) averaged Cronbach’s alphas in excess of .60 for the 12 variables measured, this, therefore, exceeded the minimum benchmark that had been set for the study. As such, the measures were considered to be appropriate measures of their respective constructs. Staff were most satisfied with the hours that they worked and least satisfied with their opportunities for promotion. Staff experienced the least amount of stress related to bullying at work and experienced the most stress related to the intensity with which they were expected to work. A moderate relationship between workplace stress and job satisfaction was identified along with strong relationships between the factors of, managerial support and work relationships; managerial support and work activities; and between role and work activities. Moderate support was found for hypothesis six which referred to the relationships between job satisfaction and age. The study aided in enhancing insight into the causes of workplace stress and job dissatisfaction within public service in South Africa and can serve as a basis for future studies into the public service industry.
- Full Text:
- Date Issued: 2019
- Authors: De Koning, Divan , Van Niekerk, Roelf
- Date: 2019
- Subjects: Job stress , Job satisfaction -- South Africa -- Eastern Cape Job satisfaction -- South Africa -- Western Cape. Public service employment -- South Africa -- Eastern Cape Public service employment -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/39414 , vital:35244
- Description: The aim of the study was to measure and explore the job satisfaction and workplace stress levels of public service staff within the Eastern and Western Cape of South Africa, as well as to establish the extent of the relationship between the areas of job satisfaction and workplace stress. The measure was predominantly administered to staff that the researcher came into contact with as a result of psychometric assessments that their employer required them to complete. The researcher facilitated the role of a service provider to the public service entities and utilised this opportunity to encourage staff to complete the measure. The measure covered five job satisfaction and seven workplace stress variables. 230 staff members completed the measure of which 170 was deemed to be useable. A quantitative study thereby enabling the investigation into the potential sources of job dissatisfaction and workplace stress was conducted. Eight hypotheses had been formulated in order to facilitate the comparisons and had been informed by prior research. The quantitative analysis established that both of the sections in the measure (job satisfaction and workplace stress) averaged Cronbach’s alphas in excess of .60 for the 12 variables measured, this, therefore, exceeded the minimum benchmark that had been set for the study. As such, the measures were considered to be appropriate measures of their respective constructs. Staff were most satisfied with the hours that they worked and least satisfied with their opportunities for promotion. Staff experienced the least amount of stress related to bullying at work and experienced the most stress related to the intensity with which they were expected to work. A moderate relationship between workplace stress and job satisfaction was identified along with strong relationships between the factors of, managerial support and work relationships; managerial support and work activities; and between role and work activities. Moderate support was found for hypothesis six which referred to the relationships between job satisfaction and age. The study aided in enhancing insight into the causes of workplace stress and job dissatisfaction within public service in South Africa and can serve as a basis for future studies into the public service industry.
- Full Text:
- Date Issued: 2019
An exploration of the materiality of forged steel as medium for visual artists
- Authors: De Lange, Neil
- Date: 2019
- Subjects: Blacksmithing , Art -- 21st century Art -- Sculpture
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/39425 , vital:35245
- Description: This research is an exploration into the materiality of forged steel, and is aimed at the preservation of traditional blacksmith forging techniques and methods by incorporating these methods as added skill set during the making of three dimensional visual art. An investigation into the history of traditional forging (iron works) serves as background aimed at the identification of the various techniques and methods utilized during the processes found in traditional blacksmith forging. The practice of this research consists of three parts: firstly, a textual investigation to establish the basics (note taking- visual journal); secondly, practical exercises to gain a better understanding of the behaviour of various steels by utilizing traditional methods of forging to explore the potential applications for the forge as a tool in service of the visual arts; and lastly, reflection on the process to modify and adapt processes (methods and techniques) to promote further interest in the use of a forge as tool during the making of three-dimensional visual art.
- Full Text:
- Date Issued: 2019
- Authors: De Lange, Neil
- Date: 2019
- Subjects: Blacksmithing , Art -- 21st century Art -- Sculpture
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/39425 , vital:35245
- Description: This research is an exploration into the materiality of forged steel, and is aimed at the preservation of traditional blacksmith forging techniques and methods by incorporating these methods as added skill set during the making of three dimensional visual art. An investigation into the history of traditional forging (iron works) serves as background aimed at the identification of the various techniques and methods utilized during the processes found in traditional blacksmith forging. The practice of this research consists of three parts: firstly, a textual investigation to establish the basics (note taking- visual journal); secondly, practical exercises to gain a better understanding of the behaviour of various steels by utilizing traditional methods of forging to explore the potential applications for the forge as a tool in service of the visual arts; and lastly, reflection on the process to modify and adapt processes (methods and techniques) to promote further interest in the use of a forge as tool during the making of three-dimensional visual art.
- Full Text:
- Date Issued: 2019
The relationship between psychological capital and flourishing in the workplace
- Authors: De Reuck, Jani
- Date: 2019
- Subjects: Psychology, Industrial , Personnel management Human capital -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39491 , vital:35272
- Description: Sales employees are often the most important channel a company uses to execute their strategies and generate income. Psychological capital emerged from the field of positive organisational scholarship, which believes that individuals and organisations will benefit from unlocking hidden potentials of employees by focusing on their strengths and positive qualities, leading to overall subjective well-being, referred to as flourishing. The purpose of this study was to investigate the relationship between Psychological Capital and the Flourishing of retail sales employees. The current research study employed a descriptive, exploratory, quantitative and cross-sectional research design. Results were gathered through formal measurements using, The Psychological capital Questionnaire and the PERMA-Profiler and were analysed through the use of statistical measures. The Psychological Capital questionnaires were used to measure the construct of Psychological Capital (hope, resilience, optimism and self-efficacy). The PERMA-Profiler were utilised to measure the level of flourishing of the sample. Participants was selected by means of non-probability convenience sampling, while a sample of 350 retail sales employees employed at the three leading retail centres in Port Elizabeth, Eastern Cape, completed the questionnaires. Quantitative data obtained from the survey questionnaires, were analysed through the use of descriptive and inferential statistics. The Pearson product-moment correlation was used to determine the strength of the relationships between the variables and the level of significance was set at a 95% confidence interval level (p ≤ 0,05). Owing to the data being non-normal, the Kruskal Wallis test was used to compare the distribution of different populations and nonparametric post hoc, Mann-Whitney U test. Based on the findings, there was a significant relationship found between psychological capital and flourishing amongst the sample employees in the retail industry. It is therefore possible that those relationships may hold true for future studies, in different industries as well as different occupations. Further exploration of these constructs is required in the South African context to see if the result in the present study can be supported or not.
- Full Text:
- Date Issued: 2019
- Authors: De Reuck, Jani
- Date: 2019
- Subjects: Psychology, Industrial , Personnel management Human capital -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39491 , vital:35272
- Description: Sales employees are often the most important channel a company uses to execute their strategies and generate income. Psychological capital emerged from the field of positive organisational scholarship, which believes that individuals and organisations will benefit from unlocking hidden potentials of employees by focusing on their strengths and positive qualities, leading to overall subjective well-being, referred to as flourishing. The purpose of this study was to investigate the relationship between Psychological Capital and the Flourishing of retail sales employees. The current research study employed a descriptive, exploratory, quantitative and cross-sectional research design. Results were gathered through formal measurements using, The Psychological capital Questionnaire and the PERMA-Profiler and were analysed through the use of statistical measures. The Psychological Capital questionnaires were used to measure the construct of Psychological Capital (hope, resilience, optimism and self-efficacy). The PERMA-Profiler were utilised to measure the level of flourishing of the sample. Participants was selected by means of non-probability convenience sampling, while a sample of 350 retail sales employees employed at the three leading retail centres in Port Elizabeth, Eastern Cape, completed the questionnaires. Quantitative data obtained from the survey questionnaires, were analysed through the use of descriptive and inferential statistics. The Pearson product-moment correlation was used to determine the strength of the relationships between the variables and the level of significance was set at a 95% confidence interval level (p ≤ 0,05). Owing to the data being non-normal, the Kruskal Wallis test was used to compare the distribution of different populations and nonparametric post hoc, Mann-Whitney U test. Based on the findings, there was a significant relationship found between psychological capital and flourishing amongst the sample employees in the retail industry. It is therefore possible that those relationships may hold true for future studies, in different industries as well as different occupations. Further exploration of these constructs is required in the South African context to see if the result in the present study can be supported or not.
- Full Text:
- Date Issued: 2019
Purchasing power parity in a newly industrialised country
- Authors: De Villiers, David James
- Date: 2019
- Subjects: Foreign exchange rates -- Econometric models , Purchasing power parity -- Econometric models , Purchasing power
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39578 , vital:35292
- Description: A newly industrialised country (NIC) is a nation whose rapid industrial growth is delivering high levels of economic development. The ‘NIC’ term is however inappropriately applied: thus this study develops a fresh exposition of the concept. Argentina, Brazil, China, Egypt, India, Indonesia, Malaysia, Mexico, Philippines, Russia, Thailand, Turkey, Vietnam, and South Africa are identified as supposed present-day NICs. Regardless of the industrialisation strategy being pursued, NICs experience exchange rates misaligned in terms of equilibrium value. This can lead to an unpredictable exchange rate, and the failure of the empirical validation of the purchasing power parity (PPP) hypothesis. Theory suggests that there exist several frictions to price movements which manifest themselves as nonlinear adjustment processes. Common empirical methodologies for evaluating PPP are however inadequate in accounting for these phenomena. To close the gap between theory and empirical evidence, the Kapetanois-Shin-Snell unit root test, augmented with flexible Fourier functions with fractional frequencies (KSS-FFFFF), is conducted in order to empirically validate the PPP hypothesis when applied to NICs. This model is capable of capturing heterogeneous smooth transitions in regime switching, and approximating unknown structural breaks in the time series. The researcher developed a novel numerical method in the form of a binary search algorithm for selecting the optimal fractional frequency of the flexible Fourier functions. This procedure significantly reduces both the approximation error and the computational cost of flexible Fourier functions with fractional frequencies. The main result of the study is that all NIC’s real exchange rates are mean-reverting over the annual and monthly periods of 1960-2016 and 1970:1-2017:11. Therefore the traditional Casselian version of PPP holds true in each NIC.
- Full Text:
- Date Issued: 2019
- Authors: De Villiers, David James
- Date: 2019
- Subjects: Foreign exchange rates -- Econometric models , Purchasing power parity -- Econometric models , Purchasing power
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/39578 , vital:35292
- Description: A newly industrialised country (NIC) is a nation whose rapid industrial growth is delivering high levels of economic development. The ‘NIC’ term is however inappropriately applied: thus this study develops a fresh exposition of the concept. Argentina, Brazil, China, Egypt, India, Indonesia, Malaysia, Mexico, Philippines, Russia, Thailand, Turkey, Vietnam, and South Africa are identified as supposed present-day NICs. Regardless of the industrialisation strategy being pursued, NICs experience exchange rates misaligned in terms of equilibrium value. This can lead to an unpredictable exchange rate, and the failure of the empirical validation of the purchasing power parity (PPP) hypothesis. Theory suggests that there exist several frictions to price movements which manifest themselves as nonlinear adjustment processes. Common empirical methodologies for evaluating PPP are however inadequate in accounting for these phenomena. To close the gap between theory and empirical evidence, the Kapetanois-Shin-Snell unit root test, augmented with flexible Fourier functions with fractional frequencies (KSS-FFFFF), is conducted in order to empirically validate the PPP hypothesis when applied to NICs. This model is capable of capturing heterogeneous smooth transitions in regime switching, and approximating unknown structural breaks in the time series. The researcher developed a novel numerical method in the form of a binary search algorithm for selecting the optimal fractional frequency of the flexible Fourier functions. This procedure significantly reduces both the approximation error and the computational cost of flexible Fourier functions with fractional frequencies. The main result of the study is that all NIC’s real exchange rates are mean-reverting over the annual and monthly periods of 1960-2016 and 1970:1-2017:11. Therefore the traditional Casselian version of PPP holds true in each NIC.
- Full Text:
- Date Issued: 2019
The enforceability of by-laws of district municipalities on local municipalities with specific reference to solid waste disposal
- Authors: De Villiers, Nico Francois
- Date: 2019
- Subjects: South Africa -- Local Government: Municipal Systems Act, 2000 , Local government -- Law and legislation -- South Africa Refuse and refuse disposal -- Law and legislation -- South Africa Refuse and refuse disposal
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/42118 , vital:36627
- Description: A consequence of the regionalisation of waste disposal services is that waste management services are no longer the primary responsibility of local municipalities but shared between local and district municipalities. The process of regionalising solid waste disposal and the regulation thereof presents unchartered territory in South Africa and raises several questions including whether, in regulating regional waste disposal services, a district municipality may do so through adopting by-laws and if so, whether these by-laws are enforceable on the local municipalities who benefit from the waste disposal service. The study confirmed the importance of cooperative governance and public participation in all decision making processes including the enactment of legislation. The absence of constitutional and legislative guidance on implementation processes for regionalisation and the overlapping nature of the functions and powers of the effected local and district municipalities are identified as challenges to the regionalisation process. The study concluded that district municipal by-laws may regulate the regional waste disposal function. These adopted by-laws, although not without boundaries, will be enforceable on local municipalities provided that the principles of cooperative governance and public participation were adhered to.
- Full Text:
- Date Issued: 2019
- Authors: De Villiers, Nico Francois
- Date: 2019
- Subjects: South Africa -- Local Government: Municipal Systems Act, 2000 , Local government -- Law and legislation -- South Africa Refuse and refuse disposal -- Law and legislation -- South Africa Refuse and refuse disposal
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: http://hdl.handle.net/10948/42118 , vital:36627
- Description: A consequence of the regionalisation of waste disposal services is that waste management services are no longer the primary responsibility of local municipalities but shared between local and district municipalities. The process of regionalising solid waste disposal and the regulation thereof presents unchartered territory in South Africa and raises several questions including whether, in regulating regional waste disposal services, a district municipality may do so through adopting by-laws and if so, whether these by-laws are enforceable on the local municipalities who benefit from the waste disposal service. The study confirmed the importance of cooperative governance and public participation in all decision making processes including the enactment of legislation. The absence of constitutional and legislative guidance on implementation processes for regionalisation and the overlapping nature of the functions and powers of the effected local and district municipalities are identified as challenges to the regionalisation process. The study concluded that district municipal by-laws may regulate the regional waste disposal function. These adopted by-laws, although not without boundaries, will be enforceable on local municipalities provided that the principles of cooperative governance and public participation were adhered to.
- Full Text:
- Date Issued: 2019
The contribution of land tenure diversity to the spatial resilience of protected area networks
- de Vos, Alta, Cumming, George S
- Authors: de Vos, Alta , Cumming, George S
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416421 , vital:71347 , xlink:href="https://doi.org/10.1002/pan3.29"
- Description: The relationship between diversity and resilience is relatively well‐established for ecological systems, but remains much less explored for socio‐economic systems. Institutional diversity can have particular relevance for protected areas, whose managerial responses to environmental change depend on their legal basis, ability to make and enforce rules and socio‐political acceptance and endorsement. 2. Protected area expansion strategies are increasingly turning to private land con‐ servation to increase the configuration and connectivity of national protected area networks. Yet, we know little about the relative role of privately owned pro‐ tected areas in protecting threatened and poorly protected (under‐represented) habitats, and in the overall connectivity of the national protected area network. 3. We present an empirical assessment of protected area tenure diversity across South Africa.
- Full Text:
- Date Issued: 2019
- Authors: de Vos, Alta , Cumming, George S
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416421 , vital:71347 , xlink:href="https://doi.org/10.1002/pan3.29"
- Description: The relationship between diversity and resilience is relatively well‐established for ecological systems, but remains much less explored for socio‐economic systems. Institutional diversity can have particular relevance for protected areas, whose managerial responses to environmental change depend on their legal basis, ability to make and enforce rules and socio‐political acceptance and endorsement. 2. Protected area expansion strategies are increasingly turning to private land con‐ servation to increase the configuration and connectivity of national protected area networks. Yet, we know little about the relative role of privately owned pro‐ tected areas in protecting threatened and poorly protected (under‐represented) habitats, and in the overall connectivity of the national protected area network. 3. We present an empirical assessment of protected area tenure diversity across South Africa.
- Full Text:
- Date Issued: 2019
The relevance of cross-scale connections and spatial interactions for ecosystem service delivery by protected areas: Insights from southern Africa
- de Vos, Alta, Cumming, Graeme S, Roux, Dirk J
- Authors: de Vos, Alta , Cumming, Graeme S , Roux, Dirk J
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416438 , vital:71348 , xlink:href="https://doi.org/10.1016/j.ecoser.2017.11.014"
- Description: The ecosystem services (ES) concept can frame the value of protected areas (PAs) to society and identify management actions that bridge biodiversity conservation and human benefits. In this special issue on ES flows to and from southern African PAs we consider two themes: (1) water as a biophysical and social-ecological connector; and (2) cross-scale interactions and connections as influences on cultural ecosystem service (CES) provision. Freshwater flows have supporting, regulating, and cultural elements, leading to complexities in governance as well as place attachment, intellectual, and recreational services. Scale dependence in CES creates trade-offs that challenge the usefulness of the ES framework for PA management. Ecosystem service production can potentially create political support for PAs and helps to build connections and feedbacks that increase PA resilience. Papers in the feature highlight a need to understand trade-offs in optimising for biodiversity vs. particular bundles of ES; impacts of investment in built infrastructure on ES use; how managers facilitate ES; scale and heterogeneity as influences; the role of adaptive monitoring of PAs as social–ecological systems; and services and benefits from PAs that are not well-articulated in ES classifications. PA research can thus add nuance, depth and substance to broader thinking around CES.
- Full Text:
- Date Issued: 2017
- Authors: de Vos, Alta , Cumming, Graeme S , Roux, Dirk J
- Date: 2017
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416438 , vital:71348 , xlink:href="https://doi.org/10.1016/j.ecoser.2017.11.014"
- Description: The ecosystem services (ES) concept can frame the value of protected areas (PAs) to society and identify management actions that bridge biodiversity conservation and human benefits. In this special issue on ES flows to and from southern African PAs we consider two themes: (1) water as a biophysical and social-ecological connector; and (2) cross-scale interactions and connections as influences on cultural ecosystem service (CES) provision. Freshwater flows have supporting, regulating, and cultural elements, leading to complexities in governance as well as place attachment, intellectual, and recreational services. Scale dependence in CES creates trade-offs that challenge the usefulness of the ES framework for PA management. Ecosystem service production can potentially create political support for PAs and helps to build connections and feedbacks that increase PA resilience. Papers in the feature highlight a need to understand trade-offs in optimising for biodiversity vs. particular bundles of ES; impacts of investment in built infrastructure on ES use; how managers facilitate ES; scale and heterogeneity as influences; the role of adaptive monitoring of PAs as social–ecological systems; and services and benefits from PAs that are not well-articulated in ES classifications. PA research can thus add nuance, depth and substance to broader thinking around CES.
- Full Text:
- Date Issued: 2017
Methods for understanding social-ecological systems: a review of place-based studies
- de Vos, Alta, Biggs, Reinette, Preiser, Rika
- Authors: de Vos, Alta , Biggs, Reinette , Preiser, Rika
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/415909 , vital:71299 , xlink:href="https://doi.org/10.5751/ES-11236-240416"
- Description: In recent years, social-ecological systems (SES) have emerged as a prominent analytical framing with which to investigate pressing sustainability issues associated with the Anthropocene era. Despite the growth of SES research, the lack of a delineated set of methods commonly contributes to disorientation for those entering into a field where methodological pluralism is the norm. We conduct a review of SES research, focusing particularly on methods used in this field. Our results reflect the rapid growth in SES research relative to other publications in relevant subject areas, and suggest a maturation of the field. Whilst institutions investigating SES have been mostly based in the global north, focal SES has been more globally distributed, although key regions, especially island regions, remain poorly studied. Key problems addressed in the studies related to policy, trade, conservation, adaptation, land use change, water, forests, sustainability, urban problems, and governance and institutions. We identified 311 methods, which we grouped into 27 method categories that can serve as a guide to SES research methods for newcomers to the field. We also performed an exploratory assessment of the ability of these methods to account for key features of SES as complex adaptive systems. We found that methods do better at accounting for the relational and context-dependent nature of SES, and least well with complex causality. Our study highlights the plurality of methods used in SES research, and helps highlight key areas in need of further methodological development.
- Full Text:
- Date Issued: 2019
- Authors: de Vos, Alta , Biggs, Reinette , Preiser, Rika
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/415909 , vital:71299 , xlink:href="https://doi.org/10.5751/ES-11236-240416"
- Description: In recent years, social-ecological systems (SES) have emerged as a prominent analytical framing with which to investigate pressing sustainability issues associated with the Anthropocene era. Despite the growth of SES research, the lack of a delineated set of methods commonly contributes to disorientation for those entering into a field where methodological pluralism is the norm. We conduct a review of SES research, focusing particularly on methods used in this field. Our results reflect the rapid growth in SES research relative to other publications in relevant subject areas, and suggest a maturation of the field. Whilst institutions investigating SES have been mostly based in the global north, focal SES has been more globally distributed, although key regions, especially island regions, remain poorly studied. Key problems addressed in the studies related to policy, trade, conservation, adaptation, land use change, water, forests, sustainability, urban problems, and governance and institutions. We identified 311 methods, which we grouped into 27 method categories that can serve as a guide to SES research methods for newcomers to the field. We also performed an exploratory assessment of the ability of these methods to account for key features of SES as complex adaptive systems. We found that methods do better at accounting for the relational and context-dependent nature of SES, and least well with complex causality. Our study highlights the plurality of methods used in SES research, and helps highlight key areas in need of further methodological development.
- Full Text:
- Date Issued: 2019
An interpretive phenomenological analysis of change in attitudes and beliefs toward domestic violence and rape myths as experienced by Eastern Cape adolescents
- Authors: De Vries, Lauré
- Date: 2019
- Subjects: Violence in children -- South Africa -- Eastern Cape , Violence -- South Africa -- Eastern Cape -- Psychological aspects Women -- Violence against Children -- Attitudes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/39436 , vital:35246
- Description: Although there is extensive research focused on decreasing the occurrence of gender-based violence (GBV) (domestic violence and rape) with a focus on underlying attitudes and beliefs, no attention is given to how these attitudes and beliefs and change therein, is experienced. This study aimed to address this gap by interviewing three adolescent learners (one female and two males aged 16 to 18) who formed part of a community-based rape prevention project at their school in Motherwell (Eastern Cape). By utilizing Interpretive Phenomenological Analysis (IPA), the researcher explored and described lived experiences in terms of change in attitudes toward domestic violence (objective 1) and beliefs about rape myths (objective 2). Analytic attention was not restricted to the perceived influence of the attended rape prevention project but was given to broader lived experiences. The Transtheoretical Model of Change was employed as the theoretical framework. From the findings, the researcher argues that the three participants experienced a shift from the precontemplation stage toward the action stage. Participants described change from a disengaged but concerned onlooker, to a conscious onlooker, and finally to a willing agent of change. Through the interplay of change influencers deeply embedded in their social context, participants described not only individual change, but also the awakening of an internal willingness to effect broader social change. However, participants raised concerns about their ability to do so. The results of this small study with a cohort of adolescents may have important implications for future research, as adolescents are often an untapped resource in forming part of the larger movement toward social change.
- Full Text:
- Date Issued: 2019
- Authors: De Vries, Lauré
- Date: 2019
- Subjects: Violence in children -- South Africa -- Eastern Cape , Violence -- South Africa -- Eastern Cape -- Psychological aspects Women -- Violence against Children -- Attitudes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/39436 , vital:35246
- Description: Although there is extensive research focused on decreasing the occurrence of gender-based violence (GBV) (domestic violence and rape) with a focus on underlying attitudes and beliefs, no attention is given to how these attitudes and beliefs and change therein, is experienced. This study aimed to address this gap by interviewing three adolescent learners (one female and two males aged 16 to 18) who formed part of a community-based rape prevention project at their school in Motherwell (Eastern Cape). By utilizing Interpretive Phenomenological Analysis (IPA), the researcher explored and described lived experiences in terms of change in attitudes toward domestic violence (objective 1) and beliefs about rape myths (objective 2). Analytic attention was not restricted to the perceived influence of the attended rape prevention project but was given to broader lived experiences. The Transtheoretical Model of Change was employed as the theoretical framework. From the findings, the researcher argues that the three participants experienced a shift from the precontemplation stage toward the action stage. Participants described change from a disengaged but concerned onlooker, to a conscious onlooker, and finally to a willing agent of change. Through the interplay of change influencers deeply embedded in their social context, participants described not only individual change, but also the awakening of an internal willingness to effect broader social change. However, participants raised concerns about their ability to do so. The results of this small study with a cohort of adolescents may have important implications for future research, as adolescents are often an untapped resource in forming part of the larger movement toward social change.
- Full Text:
- Date Issued: 2019
An investigation into the performance of smallholder irrigation schemes in Limpopo Province, South Africa: success factors, typologies and implications for development
- Denison, Jonathan Anthony Noel
- Authors: Denison, Jonathan Anthony Noel
- Date: 2019
- Subjects: Irrigation projects -- South Africa -- Limpopo , Farms, Small -- South Africa -- Limpopo , Land use -- South Africa -- Limpopo , Water-supply -- South Africa -- Limpopo
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/92317 , vital:30709
- Description: The research aimed to determine the factors that contribute to the success or failure of smallholder irrigation schemes in the Limpopo Province. It focussed on public-schemes where farmers share the water system Limpopo Province has more than half of the smallholder irrigation schemes in the country with an equipped area of approximately 28 000 ha. The main aims of the research were to identify key factors that explain performance and to develop a contemporary irrigation scheme typology. The research intended to provide a better perspective on how to focus investments across the multiple thematic areas that are associated with sustained and profitable irrigation farming activity. A survey of 102 irrigation schemes was conducted, comprising 82% of the population of schemes greater than 20 ha in Limpopo Province. The quantitative survey complemented prior in-depth qualitative research undertaken on Limpopo schemes. Data was consolidated into five performance indicators and 13 characteristic factors that impact performance. Schemes were viewed as technical and socio-biological systems where performance was determined by the dynamic interaction of multiple factors. The analysis was done in a complex systems framework using correlation, cluster and principle component analysis. It was postulated that over-arching concepts of productivity, profitability and manageability would explain why schemes succeed or fail. The schemes were found to be relatively very small in size with three quarters (74.8%) of them falling in the 50 to 250 ha size range, and only 11 schemes larger than 250 ha. Average plot sizes were 1.34 ha with a wide range between 0.18 and 16.25 ha. There were 65 operational schemes (equivalent to 63.7%), and 37 had failed (equivalent to 36.3%). Using a criterion for success of greater than 50% cropping intensity (to align with other studies and below which schemes can be considered to have failed), the success rate of the Limpopo schemes was 58%. The result was similar to the rest of South Africa and the same as the average rate for SADC identified in other studies using the same criterion. The schemes exhibited a mixed production purpose on average, with a significant market emphasis indicating these schemes have largely evolved from ‘food schemes’ to partly market-farming. Main crops grown were summer-maize and winter fresh-vegetables and cropping intensities on operational schemes ranged widely from 10% to 175%, with an average of 94%. Failure was associated with three dominant factors: energy type; infrastructure condition; and water resource constraints. The first two factors showed that manageability of technology was important. There is strong empirical evidence that pumped smallholder schemes are vulnerable in their physical form, prone to functional and financial failure, live much shorter lives, and perform no better than gravity-canal schemes. Out of the 37 schemes that failed, 34 (91.8%) were pumped. Pumped schemes tend to collapse suddenly while young and exhibit lower cut-off thresholds in productivity that, when crossed, trigger collapse. They also have much lower resilience to factors such as water stress or low farm-profitability. Pumped schemes need higher levels farm sophistication, market-oriented farming, and operational capability to keep the pumping pressure up. Water resource constraints were widespread, considerably more so on gravity schemes. Commercialising farmers were inhibited by lack of access to knowledge. Success was associated with numerous factors, but two findings stand out; the performance of gravity systems and the prevalence of land-exchange activity; the latter enabled by institutional flexibility and reflecting a process of ‘bricolage’ at play. Increased plot size was associated with increased commercialisation and, when larger than 1.8 ha, only commercialised farming was pursued. Market proximity seemed to play a role in increased longevity and to market access in commercialisation. These findings highlighted the importance of productivity and profitability in explaining success. Gravity schemes performed much more strongly in terms of longevity (nearly four times longer-lived) and similarly to pumped schemes in terms of cropping intensity. This was achieved under much greater water stress and with considerably worse infrastructure condition. Water efficiency was determined to be high on half of the schemes that were using short-furrow irrigation; equivalent, in a basin perspective, to drip irrigation. Two of the three top performing schemes (>150% intensity) were old gravity schemes. Farmers on approximately 75% of Limpopo smallholder schemes are currently engaging in land exchange transactions in a highly insecure and un-formalised institutional setup. Land exchange prevalence longer than two years was moderately associated with cropping intensity and strongly associated with commercialisation. This result has three important implications. First, it suggests that more land is utilised on the schemes when there is vibrant land-leasing activity. Secondly, schemes with a higher prevalence of long-term leasing seem to have a strong tendency to be more commercialised. Thirdly, the duration of the lease is significant, as neither single-season, nor annual leases yielded any positive associations, while those exchanges that were two years or longer, were associated with increased performance. These findings highlight the potential for longer-term land-exchange interventions to address the widespread low land utilisation on smallholder schemes, and to catalyse more commercially-oriented farming. An irrigation scheme typology was derived from the cluster analysis and was aligned to a contemporary irrigation farming typology. The key descriptors included technology type, purpose of farming and scheme management type. By matching scheme type to the farmer typology (or typologies), strategic decisions regarding technology choices for infrastructure, land, and water institutional interventions can be better informed. All schemes demand attention to the multiple factors required to achieve performance, not least water-tenure security, irrigation management organisational development, and infrastructure modernisation. Complexity was demonstrated by the finding that multiple factors contribute to success, and that there are many dimensions that change independently and have a cascading effect through the system in ways that are difficult to predict. Agricultural systems support to achieve productivity and profitability are essential for success. The research findings lead to the recommendation that, in addition, strategic planners must also consider the implications of the dominant factors of water-technology choices so that these are manageable, and the dynamics of farm-size change based on land exchange processes, in order to harness new opportunities to maximise irrigation scheme performance in future.
- Full Text:
- Date Issued: 2019
- Authors: Denison, Jonathan Anthony Noel
- Date: 2019
- Subjects: Irrigation projects -- South Africa -- Limpopo , Farms, Small -- South Africa -- Limpopo , Land use -- South Africa -- Limpopo , Water-supply -- South Africa -- Limpopo
- Language: English
- Type: text , Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/92317 , vital:30709
- Description: The research aimed to determine the factors that contribute to the success or failure of smallholder irrigation schemes in the Limpopo Province. It focussed on public-schemes where farmers share the water system Limpopo Province has more than half of the smallholder irrigation schemes in the country with an equipped area of approximately 28 000 ha. The main aims of the research were to identify key factors that explain performance and to develop a contemporary irrigation scheme typology. The research intended to provide a better perspective on how to focus investments across the multiple thematic areas that are associated with sustained and profitable irrigation farming activity. A survey of 102 irrigation schemes was conducted, comprising 82% of the population of schemes greater than 20 ha in Limpopo Province. The quantitative survey complemented prior in-depth qualitative research undertaken on Limpopo schemes. Data was consolidated into five performance indicators and 13 characteristic factors that impact performance. Schemes were viewed as technical and socio-biological systems where performance was determined by the dynamic interaction of multiple factors. The analysis was done in a complex systems framework using correlation, cluster and principle component analysis. It was postulated that over-arching concepts of productivity, profitability and manageability would explain why schemes succeed or fail. The schemes were found to be relatively very small in size with three quarters (74.8%) of them falling in the 50 to 250 ha size range, and only 11 schemes larger than 250 ha. Average plot sizes were 1.34 ha with a wide range between 0.18 and 16.25 ha. There were 65 operational schemes (equivalent to 63.7%), and 37 had failed (equivalent to 36.3%). Using a criterion for success of greater than 50% cropping intensity (to align with other studies and below which schemes can be considered to have failed), the success rate of the Limpopo schemes was 58%. The result was similar to the rest of South Africa and the same as the average rate for SADC identified in other studies using the same criterion. The schemes exhibited a mixed production purpose on average, with a significant market emphasis indicating these schemes have largely evolved from ‘food schemes’ to partly market-farming. Main crops grown were summer-maize and winter fresh-vegetables and cropping intensities on operational schemes ranged widely from 10% to 175%, with an average of 94%. Failure was associated with three dominant factors: energy type; infrastructure condition; and water resource constraints. The first two factors showed that manageability of technology was important. There is strong empirical evidence that pumped smallholder schemes are vulnerable in their physical form, prone to functional and financial failure, live much shorter lives, and perform no better than gravity-canal schemes. Out of the 37 schemes that failed, 34 (91.8%) were pumped. Pumped schemes tend to collapse suddenly while young and exhibit lower cut-off thresholds in productivity that, when crossed, trigger collapse. They also have much lower resilience to factors such as water stress or low farm-profitability. Pumped schemes need higher levels farm sophistication, market-oriented farming, and operational capability to keep the pumping pressure up. Water resource constraints were widespread, considerably more so on gravity schemes. Commercialising farmers were inhibited by lack of access to knowledge. Success was associated with numerous factors, but two findings stand out; the performance of gravity systems and the prevalence of land-exchange activity; the latter enabled by institutional flexibility and reflecting a process of ‘bricolage’ at play. Increased plot size was associated with increased commercialisation and, when larger than 1.8 ha, only commercialised farming was pursued. Market proximity seemed to play a role in increased longevity and to market access in commercialisation. These findings highlighted the importance of productivity and profitability in explaining success. Gravity schemes performed much more strongly in terms of longevity (nearly four times longer-lived) and similarly to pumped schemes in terms of cropping intensity. This was achieved under much greater water stress and with considerably worse infrastructure condition. Water efficiency was determined to be high on half of the schemes that were using short-furrow irrigation; equivalent, in a basin perspective, to drip irrigation. Two of the three top performing schemes (>150% intensity) were old gravity schemes. Farmers on approximately 75% of Limpopo smallholder schemes are currently engaging in land exchange transactions in a highly insecure and un-formalised institutional setup. Land exchange prevalence longer than two years was moderately associated with cropping intensity and strongly associated with commercialisation. This result has three important implications. First, it suggests that more land is utilised on the schemes when there is vibrant land-leasing activity. Secondly, schemes with a higher prevalence of long-term leasing seem to have a strong tendency to be more commercialised. Thirdly, the duration of the lease is significant, as neither single-season, nor annual leases yielded any positive associations, while those exchanges that were two years or longer, were associated with increased performance. These findings highlight the potential for longer-term land-exchange interventions to address the widespread low land utilisation on smallholder schemes, and to catalyse more commercially-oriented farming. An irrigation scheme typology was derived from the cluster analysis and was aligned to a contemporary irrigation farming typology. The key descriptors included technology type, purpose of farming and scheme management type. By matching scheme type to the farmer typology (or typologies), strategic decisions regarding technology choices for infrastructure, land, and water institutional interventions can be better informed. All schemes demand attention to the multiple factors required to achieve performance, not least water-tenure security, irrigation management organisational development, and infrastructure modernisation. Complexity was demonstrated by the finding that multiple factors contribute to success, and that there are many dimensions that change independently and have a cascading effect through the system in ways that are difficult to predict. Agricultural systems support to achieve productivity and profitability are essential for success. The research findings lead to the recommendation that, in addition, strategic planners must also consider the implications of the dominant factors of water-technology choices so that these are manageable, and the dynamics of farm-size change based on land exchange processes, in order to harness new opportunities to maximise irrigation scheme performance in future.
- Full Text:
- Date Issued: 2019
Investigating assay formats for screening malaria Hsp90-Hop interaction inhibitors
- Authors: Derry, Leigh-Anne Tracy Kim
- Date: 2019
- Subjects: Antimalarials , Heat shock proteins , Drug interactions , Drug resistance , Plasmodium falciparum , High throughput screening (Drug development) , Bioluminescence resonance energy transfer (BRET) , Fluorescence resonance energy transfer (FRET)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63345 , vital:28395
- Description: Although significant gains have been made in the combat against malaria in the last decade, the persistent threat of drug and insecticide resistance continues to motivate the search for new classes of antimalarial drug compounds and targets. Due to their predominance in cellular reactions, protein-protein interactions (P-PIs) are emerging as a promising general target class for therapeutic development. The P-PI which is the focus of this project is the interaction between the chaperone heat shock protein 90 (Hsp90) and its co-chaperone Hsp70/Hsp90 organising protein (Hop). Hop binds to Hsp70 and Hsp90 and facilitates the transfer of client proteins (proteins undergoing folding) from the former to the latter and also regulates nucleotide exchange on Hsp90. Due to its role in correcting protein misfolding during cell stress, Hsp90 is being pursued as a cancer drug target and compounds that inhibit its ATPase activity have entered clinical trials. However, it has been proposed that inhibiting the interaction between Hsp90 and Hop may be alternative approach for inhibiting Hsp90 function for cancer therapy. The malaria parasite Plasmodium falciparum experiences temperature fluctuations during vector-host transitions and febrile episodes and cell stress due to rapid growth and immune responses. Hence, it also depends on chaperones, including PfHsp90, to maintain protein functionality and pathogenesis, demonstrated inter alia by the sensitivity of parasites to Hsp90 inhibitors. In addition, PfHsp90 exists as a complex with the malarial Hop homologue, PfHop, in parasite lysates. Consequently, the purpose of this study was to explore P-PI assay formats that can confirm the interaction of PfHsp90 and PfHop and can be used to identify inhibitors of the interaction, preferably in a medium- to high-throughput screening mode. As a first approach, cell-based bioluminescence and fluorescence resonance energy transfer (BRET and FRET) assays were performed in HeLa cells. To facilitate this, expression plasmid constructs containing coding sequences of P. falciparum and mammalian Hsp90 and Hop and their interacting domains (Hsp90 C-domain and Hop TPR2A domain) fused to the BRET and FRET reporter proteins – yellow fluorescent protein (YFP), cyan fluorescent protein (CFP) and Renilla luciferase (Rluc) - were prepared and used for HeLa cell transient transfections. The FRET assay produced positive interaction signals for the full-length P. falciparum and mammalian Hsp90-Hop interactions. However, C-domain-TPR2A domain interactions were not detected, no interactions could be demonstrated with the BRET assay and western blotting experiments failed to detect expression of all the interaction partners in transiently transfected HeLa cells. Consequently, an alternative in vitro FRET assay format using recombinant proteins was investigated. Expression constructs for the P. falciparum and mammalian C-domains and TPR2A domains fused respectively to YFP and CFP were prepared and the corresponding fusion proteins expressed and purified from E. coli. No interaction was found with the mammalian interaction partners, but interaction of the P. falciparum C-domain and TPR2A domain was consistently detected with a robust Z’ factor value of 0.54. A peptide corresponding to the PfTPR2A domain sequence primarily responsible for Hsp90 binding (based on a human TPR2A peptide described by Horibe et al., 2011) was designed and showed dose-dependent inhibition of the interaction, with 53.7% inhibition at 100 μM. The components of the assay are limited to the purified recombinant proteins, requires minimal liquid steps and may thus be a useful primary screening format for identifying inhibitors of P. falciparum Hsp90-Hop interaction.
- Full Text:
- Date Issued: 2019
- Authors: Derry, Leigh-Anne Tracy Kim
- Date: 2019
- Subjects: Antimalarials , Heat shock proteins , Drug interactions , Drug resistance , Plasmodium falciparum , High throughput screening (Drug development) , Bioluminescence resonance energy transfer (BRET) , Fluorescence resonance energy transfer (FRET)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/63345 , vital:28395
- Description: Although significant gains have been made in the combat against malaria in the last decade, the persistent threat of drug and insecticide resistance continues to motivate the search for new classes of antimalarial drug compounds and targets. Due to their predominance in cellular reactions, protein-protein interactions (P-PIs) are emerging as a promising general target class for therapeutic development. The P-PI which is the focus of this project is the interaction between the chaperone heat shock protein 90 (Hsp90) and its co-chaperone Hsp70/Hsp90 organising protein (Hop). Hop binds to Hsp70 and Hsp90 and facilitates the transfer of client proteins (proteins undergoing folding) from the former to the latter and also regulates nucleotide exchange on Hsp90. Due to its role in correcting protein misfolding during cell stress, Hsp90 is being pursued as a cancer drug target and compounds that inhibit its ATPase activity have entered clinical trials. However, it has been proposed that inhibiting the interaction between Hsp90 and Hop may be alternative approach for inhibiting Hsp90 function for cancer therapy. The malaria parasite Plasmodium falciparum experiences temperature fluctuations during vector-host transitions and febrile episodes and cell stress due to rapid growth and immune responses. Hence, it also depends on chaperones, including PfHsp90, to maintain protein functionality and pathogenesis, demonstrated inter alia by the sensitivity of parasites to Hsp90 inhibitors. In addition, PfHsp90 exists as a complex with the malarial Hop homologue, PfHop, in parasite lysates. Consequently, the purpose of this study was to explore P-PI assay formats that can confirm the interaction of PfHsp90 and PfHop and can be used to identify inhibitors of the interaction, preferably in a medium- to high-throughput screening mode. As a first approach, cell-based bioluminescence and fluorescence resonance energy transfer (BRET and FRET) assays were performed in HeLa cells. To facilitate this, expression plasmid constructs containing coding sequences of P. falciparum and mammalian Hsp90 and Hop and their interacting domains (Hsp90 C-domain and Hop TPR2A domain) fused to the BRET and FRET reporter proteins – yellow fluorescent protein (YFP), cyan fluorescent protein (CFP) and Renilla luciferase (Rluc) - were prepared and used for HeLa cell transient transfections. The FRET assay produced positive interaction signals for the full-length P. falciparum and mammalian Hsp90-Hop interactions. However, C-domain-TPR2A domain interactions were not detected, no interactions could be demonstrated with the BRET assay and western blotting experiments failed to detect expression of all the interaction partners in transiently transfected HeLa cells. Consequently, an alternative in vitro FRET assay format using recombinant proteins was investigated. Expression constructs for the P. falciparum and mammalian C-domains and TPR2A domains fused respectively to YFP and CFP were prepared and the corresponding fusion proteins expressed and purified from E. coli. No interaction was found with the mammalian interaction partners, but interaction of the P. falciparum C-domain and TPR2A domain was consistently detected with a robust Z’ factor value of 0.54. A peptide corresponding to the PfTPR2A domain sequence primarily responsible for Hsp90 binding (based on a human TPR2A peptide described by Horibe et al., 2011) was designed and showed dose-dependent inhibition of the interaction, with 53.7% inhibition at 100 μM. The components of the assay are limited to the purified recombinant proteins, requires minimal liquid steps and may thus be a useful primary screening format for identifying inhibitors of P. falciparum Hsp90-Hop interaction.
- Full Text:
- Date Issued: 2019
Using four different methods to reach a taxonomic conclusion in dung beetles (Scarabaeinae)
- Authors: Deschodt, Christian Michel
- Date: 2019
- Subjects: Dung beetles -- Classification , Scarabaeidae -- Classification
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/67845 , vital:29156
- Description: Four different techniques to make taxonomic decisions concerning different species in Scarabaeinae are being investigated. Firstly, I made measurements of the body dimensions which are plotted on a two dimensional graph. This method is successfully used to erect one new species, Copris crassus Deschodt and Davis, 2015, and to establish the synonymy of Copris bihamatus Balthasar, 1965 with Copris fidius (Olivier, 1789). Thereafter the classical or traditional comparative method is used to propose seven new species Scarabaeolus soutpansbergensis (Deschodt and Davis 2015), Scarabaeolus megaparvulus (Davis and Deschodt 2015), Scarabaeolus niemandi (Deschodt and Davis 2015), Scarabaeolus carniphilus (Davis and Deschodt 2015), Scarabaeolus ermienae (Deschodt and Davis 2015), Scarabaeolus planipennis (Davis and Deschodt 2015) and Scarabaeolus afronitidus (Davis and Deschodt 2015) and formally synonymise Scarabaeolus vansoni (Ferreira, 1958) with Scarabaeolus lucidulus (Boheman, 1860) and Scarabaeolus xavieri (Ferreira, 1968) with Scarabaeolus andreaei (zur Strassen, 1963). Morphometric measurements of external structures of a group of flightless relict beetles in the tribe Canthonini are used to compile a nexus file which is analysed with computer software. The interpretation of these results is used here to support the erection of a new genus Drogo Deschodt, Davis & Scholtz 2016, Lastly I analysed the DNA sequences of specimens from different species belonging to a species complex in the genus Epirinus Reiche, 1841 occurring over a wide geographic range. These sequences are used together with external morphological characters to propose the synonymy of Epirinus hluhluwensis Medina & Scholtz 2005 and Epirinus ngomae Medina & Scholtz 2005 with Epirinus davisi Scholtz & Howden 1987.
- Full Text:
- Date Issued: 2019
- Authors: Deschodt, Christian Michel
- Date: 2019
- Subjects: Dung beetles -- Classification , Scarabaeidae -- Classification
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/67845 , vital:29156
- Description: Four different techniques to make taxonomic decisions concerning different species in Scarabaeinae are being investigated. Firstly, I made measurements of the body dimensions which are plotted on a two dimensional graph. This method is successfully used to erect one new species, Copris crassus Deschodt and Davis, 2015, and to establish the synonymy of Copris bihamatus Balthasar, 1965 with Copris fidius (Olivier, 1789). Thereafter the classical or traditional comparative method is used to propose seven new species Scarabaeolus soutpansbergensis (Deschodt and Davis 2015), Scarabaeolus megaparvulus (Davis and Deschodt 2015), Scarabaeolus niemandi (Deschodt and Davis 2015), Scarabaeolus carniphilus (Davis and Deschodt 2015), Scarabaeolus ermienae (Deschodt and Davis 2015), Scarabaeolus planipennis (Davis and Deschodt 2015) and Scarabaeolus afronitidus (Davis and Deschodt 2015) and formally synonymise Scarabaeolus vansoni (Ferreira, 1958) with Scarabaeolus lucidulus (Boheman, 1860) and Scarabaeolus xavieri (Ferreira, 1968) with Scarabaeolus andreaei (zur Strassen, 1963). Morphometric measurements of external structures of a group of flightless relict beetles in the tribe Canthonini are used to compile a nexus file which is analysed with computer software. The interpretation of these results is used here to support the erection of a new genus Drogo Deschodt, Davis & Scholtz 2016, Lastly I analysed the DNA sequences of specimens from different species belonging to a species complex in the genus Epirinus Reiche, 1841 occurring over a wide geographic range. These sequences are used together with external morphological characters to propose the synonymy of Epirinus hluhluwensis Medina & Scholtz 2005 and Epirinus ngomae Medina & Scholtz 2005 with Epirinus davisi Scholtz & Howden 1987.
- Full Text:
- Date Issued: 2019
Bootstrap-based tolerance intervals for photovoltaic energy yield assessments
- Authors: Deyzel, Jani Igna
- Date: 2019
- Subjects: Bootstrap (Statistics) , Mathematical statistics Photovoltaic power systems
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/39469 , vital:35256
- Description: The assessment of the energy yield of a photovoltaic (PV) system is one of the key assessments required by investors and developers. Currently, available methods used for this assessment only provide a point estimate as the final assessment. This study proposes a statistical technique which provides an additional energy yield assessment method by using tolerance intervals. Variance component models are used to better account for the variability present in the daily and hourly energy yields of three different PV modules. A bootstrap-based technique is used to obtain 𝛽-expectation and (𝛼,𝛽) two-sided tolerance intervals. These tolerance intervals provided more information with a content and confidence level for seasonal and yearly time-periods. In addition, the comparisons of the PV modules provide valuable information to investors and developers.
- Full Text:
- Date Issued: 2019
- Authors: Deyzel, Jani Igna
- Date: 2019
- Subjects: Bootstrap (Statistics) , Mathematical statistics Photovoltaic power systems
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/39469 , vital:35256
- Description: The assessment of the energy yield of a photovoltaic (PV) system is one of the key assessments required by investors and developers. Currently, available methods used for this assessment only provide a point estimate as the final assessment. This study proposes a statistical technique which provides an additional energy yield assessment method by using tolerance intervals. Variance component models are used to better account for the variability present in the daily and hourly energy yields of three different PV modules. A bootstrap-based technique is used to obtain 𝛽-expectation and (𝛼,𝛽) two-sided tolerance intervals. These tolerance intervals provided more information with a content and confidence level for seasonal and yearly time-periods. In addition, the comparisons of the PV modules provide valuable information to investors and developers.
- Full Text:
- Date Issued: 2019
The art of science: utilising artistic methods to assist in the learning of natural sciences and technology in the intermediate phase
- Authors: Deyzel, Jenilyn
- Date: 2019
- Subjects: Science -- Study and teaching (Primary) -- South Africa , Science -- Study and teaching (Elementary) Educational toys
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/39502 , vital:35279
- Description: This explorative case-study investigates the educational opportunities associated with an Art-infused pedagogy, according to the perceptions of ten Natural Sciences and Technology (NST) teachers. To examine the possible learning benefits of incorporating artistic activities into the teaching of NST, an Educative Curriculum Material (ECM) was designed that focused on teacher learning and the application of skills in real-life educational practice (Krajcik & Delen, 2017). Results suggest that the ECM, known as the Art-education intervention, facilitated an understanding of the learning potential of an Art-based pedagogy, provided practical ways of applying artistic methods in the classroom and illustrated how Art and NST could be taught together. Thus, the ECM supported the participant’s pedagogical design capacity. As a qualitative and interpretive study, emphasis is placed on the unique perspective of each participant while addressing similarities between cases (Creswell & Poth, 2018). Pre-and post-intervention interviews were conducted, recorded and analysed. Data were gathered systematically through the use of semi-structured interview questions and a questionnaire that required participant involvement through drawing and critical reflection. The case-based themes generated through analysis of data, represent shared ideas raised by the participants themselves. Results suggest that an Art-infused pedagogy can provide children with the opportunity to develop observation and critical thinking capabilities, including the advancement of spatial reasoning skills, problem solving abilities and metacognition. The participants reported an increased level of engagement from the children in their respective classes, where ‘doing’ aided the learning process. Added to this, the use of artistic terminology and open-ended questioning facilitated vocabulary enhancement. Time and resource constraints were identified as potential concerns when implementing an Art-infused pedagogy, as was a teacher’s perception of his/her own artistic abilities. Previous artistic experience had little influence on a teacher’s ability to teach in an integrated manner, suggesting that with effective training, artistic activities could be utilised by any NST teacher to promote learning in NST.
- Full Text:
- Date Issued: 2019
- Authors: Deyzel, Jenilyn
- Date: 2019
- Subjects: Science -- Study and teaching (Primary) -- South Africa , Science -- Study and teaching (Elementary) Educational toys
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/39502 , vital:35279
- Description: This explorative case-study investigates the educational opportunities associated with an Art-infused pedagogy, according to the perceptions of ten Natural Sciences and Technology (NST) teachers. To examine the possible learning benefits of incorporating artistic activities into the teaching of NST, an Educative Curriculum Material (ECM) was designed that focused on teacher learning and the application of skills in real-life educational practice (Krajcik & Delen, 2017). Results suggest that the ECM, known as the Art-education intervention, facilitated an understanding of the learning potential of an Art-based pedagogy, provided practical ways of applying artistic methods in the classroom and illustrated how Art and NST could be taught together. Thus, the ECM supported the participant’s pedagogical design capacity. As a qualitative and interpretive study, emphasis is placed on the unique perspective of each participant while addressing similarities between cases (Creswell & Poth, 2018). Pre-and post-intervention interviews were conducted, recorded and analysed. Data were gathered systematically through the use of semi-structured interview questions and a questionnaire that required participant involvement through drawing and critical reflection. The case-based themes generated through analysis of data, represent shared ideas raised by the participants themselves. Results suggest that an Art-infused pedagogy can provide children with the opportunity to develop observation and critical thinking capabilities, including the advancement of spatial reasoning skills, problem solving abilities and metacognition. The participants reported an increased level of engagement from the children in their respective classes, where ‘doing’ aided the learning process. Added to this, the use of artistic terminology and open-ended questioning facilitated vocabulary enhancement. Time and resource constraints were identified as potential concerns when implementing an Art-infused pedagogy, as was a teacher’s perception of his/her own artistic abilities. Previous artistic experience had little influence on a teacher’s ability to teach in an integrated manner, suggesting that with effective training, artistic activities could be utilised by any NST teacher to promote learning in NST.
- Full Text:
- Date Issued: 2019