'n Eenvormige dissiplinestelsel vir skole in die Bitou 10-streek
- Authors: Freislich, Maria Francina
- Date: 2010
- Subjects: School discipline -- South Africa , School boards -- South Africa
- Language: Afrikaans
- Type: Thesis , Masters , MEd
- Identifier: vital:9506 , http://hdl.handle.net/10948/1236 , School discipline -- South Africa , School boards -- South Africa
- Description: Discipline in the government schools in South Africa has deteriorated during the past fifteen years. There are many different reasons for that. The aim of this study was to develop a uniform programme of discipline which can be used for application in all ten schools in the Bitou area. To reach this aim, the following procedures were followed: • A study has been done regarding the supporting role of the Bitou 10 foundation in the designing and management of a uniform discipline program. • A summary of the disciplinary problems in government schools has been given with possible reasons why discipline has deteriorated. • A study has also been made of various programs of discipline which have been used in various countries in the past. Certain aspects of those programmes have been used in this study to compile an effective programme of discipline for all the schools in the Bitou area. • Criteria for a positive discipline program have been put together. This study has been done in the Plettenberg Bay area. This area has ten schools which include primary- and high schools, single medium- and double medium schools, multi-cultural and mono-cultural schools and also some schools which have hostels. This study showed that not all schools in the Bitou area follow the same disciplinary programme. This study also makes recommendations on the possible implementing of such a uniform system of discipline. This study does not only show what the role is of the principal and teachers responsible for discipline, but also indicates the role and task of the parents and the community. Research on the application of discipline can never end because new ideas and methods will always be found to create an ideal programme in order to make the process more effective.
- Full Text:
- Date Issued: 2010
- Authors: Freislich, Maria Francina
- Date: 2010
- Subjects: School discipline -- South Africa , School boards -- South Africa
- Language: Afrikaans
- Type: Thesis , Masters , MEd
- Identifier: vital:9506 , http://hdl.handle.net/10948/1236 , School discipline -- South Africa , School boards -- South Africa
- Description: Discipline in the government schools in South Africa has deteriorated during the past fifteen years. There are many different reasons for that. The aim of this study was to develop a uniform programme of discipline which can be used for application in all ten schools in the Bitou area. To reach this aim, the following procedures were followed: • A study has been done regarding the supporting role of the Bitou 10 foundation in the designing and management of a uniform discipline program. • A summary of the disciplinary problems in government schools has been given with possible reasons why discipline has deteriorated. • A study has also been made of various programs of discipline which have been used in various countries in the past. Certain aspects of those programmes have been used in this study to compile an effective programme of discipline for all the schools in the Bitou area. • Criteria for a positive discipline program have been put together. This study has been done in the Plettenberg Bay area. This area has ten schools which include primary- and high schools, single medium- and double medium schools, multi-cultural and mono-cultural schools and also some schools which have hostels. This study showed that not all schools in the Bitou area follow the same disciplinary programme. This study also makes recommendations on the possible implementing of such a uniform system of discipline. This study does not only show what the role is of the principal and teachers responsible for discipline, but also indicates the role and task of the parents and the community. Research on the application of discipline can never end because new ideas and methods will always be found to create an ideal programme in order to make the process more effective.
- Full Text:
- Date Issued: 2010
Farm wages and working conditions in the Albany District, 1957-2008
- Authors: Roberts, Tamaryn Jean
- Date: 2010
- Subjects: Agricultural laborers -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa , Agricultural laborers -- Protection -- South Africa , Agricultural laws and legislation -- South Africa , Labour laws and legislation -- South Africa , Labour economics -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:978 , http://hdl.handle.net/10962/d1002712
- Description: Agriculture is a major employer of labour in South Africa with about 8.8% of the total labour force directly involved in agricultural production (StatsSA, 2007a). Farm wages and working conditions in the Albany district were researched in 1957 by Roberts (1958) and 1977 by Antrobus (1984). Research in 2008, involving face-to-face interviews of a sample survey of 40 Albany farmers, was undertaken to update the situation facing farm labourers and allowed for comparisons with the work previously done. Farm workers were governed by common law until 1994 when the government intervened with legislation. The introduction of the Basic Conditions of Employment Act (1997) for farm workers, amended in 2002 to include minimum wage legislation, and the Extension of Security of Tenure Act (ESTA) of 1997 impacted the supply and demand of farm workers. Other impacts have been due to the Albany district experiencing an increase in the establishment of Private Game Reserves and game-tourism with a simultaneous decline in conventional farming. It was concluded from the survey conducted that minimum wage legislation decreased the demand for regular and increased the demand for casual labour, which incur lower costs including transaction costs, than their regular counterparts. The ESTA of 1997 contributed to a decreased number of farm residents, which had spin-off affects on the supply of labour. Farmers experienced a simultaneous price-cost squeeze, which furthermore decreased the demand for labour. Studying the working and living conditions showed that farm workers had limited access to educational and recreational facilities which negatively impacted the supply of labour.
- Full Text:
- Date Issued: 2010
- Authors: Roberts, Tamaryn Jean
- Date: 2010
- Subjects: Agricultural laborers -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa , Agricultural laborers -- Protection -- South Africa , Agricultural laws and legislation -- South Africa , Labour laws and legislation -- South Africa , Labour economics -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:978 , http://hdl.handle.net/10962/d1002712
- Description: Agriculture is a major employer of labour in South Africa with about 8.8% of the total labour force directly involved in agricultural production (StatsSA, 2007a). Farm wages and working conditions in the Albany district were researched in 1957 by Roberts (1958) and 1977 by Antrobus (1984). Research in 2008, involving face-to-face interviews of a sample survey of 40 Albany farmers, was undertaken to update the situation facing farm labourers and allowed for comparisons with the work previously done. Farm workers were governed by common law until 1994 when the government intervened with legislation. The introduction of the Basic Conditions of Employment Act (1997) for farm workers, amended in 2002 to include minimum wage legislation, and the Extension of Security of Tenure Act (ESTA) of 1997 impacted the supply and demand of farm workers. Other impacts have been due to the Albany district experiencing an increase in the establishment of Private Game Reserves and game-tourism with a simultaneous decline in conventional farming. It was concluded from the survey conducted that minimum wage legislation decreased the demand for regular and increased the demand for casual labour, which incur lower costs including transaction costs, than their regular counterparts. The ESTA of 1997 contributed to a decreased number of farm residents, which had spin-off affects on the supply of labour. Farmers experienced a simultaneous price-cost squeeze, which furthermore decreased the demand for labour. Studying the working and living conditions showed that farm workers had limited access to educational and recreational facilities which negatively impacted the supply of labour.
- Full Text:
- Date Issued: 2010
Politics in the slum: a view from South Africa
- Authors: Pithouse, Richard, 1970-
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6209 , http://hdl.handle.net/10962/d1008579
- Description: [From introduction]The modern state, and its civil society, have always been comfortable with workers in their allotted place – be it formed around the immediate needs of industrial production, like the migrant workers hostels in apartheid South Africa or contemporary Dubai, or an attempt at creating a haven, like the suburban home which has its roots in the gendered and raced class compromise reached in North America after the Second World War. When there has been a part of the population rendered or considered superfluous to the immediate needs of production there has been a degree of comfort with the inevitably bounded spaces into which these people have been abandoned or contained – prisons, ghettos, Bantustans etc. But both the modern state and civil society have always been acutely uncomfortable with that part of the ‘dangerous class’ - vagabonds or squatters - that are, by virtue of their occupation of space outside of state regulation, by definition out of place and threatening to domination constructed, along with other lines of force, on the ordering of space.
- Full Text:
- Date Issued: 2010
- Authors: Pithouse, Richard, 1970-
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6209 , http://hdl.handle.net/10962/d1008579
- Description: [From introduction]The modern state, and its civil society, have always been comfortable with workers in their allotted place – be it formed around the immediate needs of industrial production, like the migrant workers hostels in apartheid South Africa or contemporary Dubai, or an attempt at creating a haven, like the suburban home which has its roots in the gendered and raced class compromise reached in North America after the Second World War. When there has been a part of the population rendered or considered superfluous to the immediate needs of production there has been a degree of comfort with the inevitably bounded spaces into which these people have been abandoned or contained – prisons, ghettos, Bantustans etc. But both the modern state and civil society have always been acutely uncomfortable with that part of the ‘dangerous class’ - vagabonds or squatters - that are, by virtue of their occupation of space outside of state regulation, by definition out of place and threatening to domination constructed, along with other lines of force, on the ordering of space.
- Full Text:
- Date Issued: 2010
The Scope of Teaching and Learning in Environmental Education
- Authors: Lotz-Sisitka, Heila
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/183037 , vital:43906 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/172809"
- Description: Environmental Education involves a variety of teaching and learning processes which are diversely situated in a range of social and educational contexts. The diversity of scope is an interesting 'contour' of a field like environmental education. Contemporary environmental sciences and complexity studies draw our attention to an ever-changing world and to increasingly complex social-ecological issues, patterns and risks that require our attention. These too influence the scope of environmental education teaching and learning processes. This edition of the Southern African Journal of Environmental Education provides a window through which we may see some of the scope of environmental education activities, research questions, learning and teaching settings, and educational activity. It provides insight into the range of research methodologies that are being deployed to investigate the educational processes that are needed for re-orientation towards sustainability, equity, adaptability and transformation at the people-environment interface.
- Full Text: false
- Date Issued: 2010
- Authors: Lotz-Sisitka, Heila
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/183037 , vital:43906 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/172809"
- Description: Environmental Education involves a variety of teaching and learning processes which are diversely situated in a range of social and educational contexts. The diversity of scope is an interesting 'contour' of a field like environmental education. Contemporary environmental sciences and complexity studies draw our attention to an ever-changing world and to increasingly complex social-ecological issues, patterns and risks that require our attention. These too influence the scope of environmental education teaching and learning processes. This edition of the Southern African Journal of Environmental Education provides a window through which we may see some of the scope of environmental education activities, research questions, learning and teaching settings, and educational activity. It provides insight into the range of research methodologies that are being deployed to investigate the educational processes that are needed for re-orientation towards sustainability, equity, adaptability and transformation at the people-environment interface.
- Full Text: false
- Date Issued: 2010
The fatigue life cycle prediction of a light aircraft undercarriage
- Authors: Erasmus, Daniel Jacobus
- Date: 2010
- Subjects: Metals--Fatigue
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9614 , http://hdl.handle.net/10948/1527 , Metals--Fatigue
- Description: The reliability of systems relies heavily on accurate fatigue life prediction of related components. Fatigue life prediction is a complicated process requiring the correct methodology to determine accurate and reliable predictions. The Palmgren – Miner damage accumulation hypothesis is widely used in determining the fatigue life of components exposed to variable loading conditions. Modifications have been made to this hypothesis trying to achieve a greater degree of accuracy, of these the Liu – Zenner modification has been the most successful. In this report the systematic process of fatigue life prediction using the Liu – Zenner modification to achieve reliable results is calculated. A representative stress time history measured in service on the component forms the basis for defining a flight cycle which is the chosen unit in which to express the fatigue life. Rainflow cycle counting performed on the stress time history allowed the formulation of a load spectrum to which the component is exposed in one cycle. Combining the load spectrum with the developed SN curve of the component and using the Liu – Zenner modification to the Palmgren – Miner rule a reliable fatigue life in cycles is predicted.
- Full Text:
- Date Issued: 2010
- Authors: Erasmus, Daniel Jacobus
- Date: 2010
- Subjects: Metals--Fatigue
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9614 , http://hdl.handle.net/10948/1527 , Metals--Fatigue
- Description: The reliability of systems relies heavily on accurate fatigue life prediction of related components. Fatigue life prediction is a complicated process requiring the correct methodology to determine accurate and reliable predictions. The Palmgren – Miner damage accumulation hypothesis is widely used in determining the fatigue life of components exposed to variable loading conditions. Modifications have been made to this hypothesis trying to achieve a greater degree of accuracy, of these the Liu – Zenner modification has been the most successful. In this report the systematic process of fatigue life prediction using the Liu – Zenner modification to achieve reliable results is calculated. A representative stress time history measured in service on the component forms the basis for defining a flight cycle which is the chosen unit in which to express the fatigue life. Rainflow cycle counting performed on the stress time history allowed the formulation of a load spectrum to which the component is exposed in one cycle. Combining the load spectrum with the developed SN curve of the component and using the Liu – Zenner modification to the Palmgren – Miner rule a reliable fatigue life in cycles is predicted.
- Full Text:
- Date Issued: 2010
The largest volcanic eruptions on Earth
- Bryan, Scott E, Peate, Ingrid Ukstins, Peate, David W, Self, Stephen, Jerram, Dougal A, Mawby, Michael R, Marsh, Julian S, Miller, Jodie A
- Authors: Bryan, Scott E , Peate, Ingrid Ukstins , Peate, David W , Self, Stephen , Jerram, Dougal A , Mawby, Michael R , Marsh, Julian S , Miller, Jodie A
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/132887 , vital:36902 , https://doi.org/10.1016/j.earscirev.2010.07.001
- Description: Large igneous provinces (LIPs) are sites of the most frequently recurring, largest volume basaltic and silicic eruptions in Earth history. These large-volume (> 1000 km3 dense rock equivalent) and large-magnitude (> M8) eruptions produce really extensive (104–105 km2) basaltic lava flow fields and silicic ignimbrites that are the main building blocks of LIPs.
- Full Text: false
- Date Issued: 2010
- Authors: Bryan, Scott E , Peate, Ingrid Ukstins , Peate, David W , Self, Stephen , Jerram, Dougal A , Mawby, Michael R , Marsh, Julian S , Miller, Jodie A
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/132887 , vital:36902 , https://doi.org/10.1016/j.earscirev.2010.07.001
- Description: Large igneous provinces (LIPs) are sites of the most frequently recurring, largest volume basaltic and silicic eruptions in Earth history. These large-volume (> 1000 km3 dense rock equivalent) and large-magnitude (> M8) eruptions produce really extensive (104–105 km2) basaltic lava flow fields and silicic ignimbrites that are the main building blocks of LIPs.
- Full Text: false
- Date Issued: 2010
Sample preparation for pesticide analysis in water and sediments a case study of the Okavango Delta, Botswana
- Authors: Mmualefe, Lesego Cecilia
- Date: 2010
- Subjects: Water quality -- Botswana -- Okavango Delta Water -- Analysis Pesticides -- Environmental aspects -- Botswana -- Okavango Delta Water -- Pollution -- Botswana -- Okavango Delta DDT (Insecticide) -- Environmental aspects -- Botswana -- Okavango Delta
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4344 , http://hdl.handle.net/10962/d1005006
- Description: This thesis presents a first ever extensive analysis of pesticides in water and sediments from the Okavango Delta, Botswana, employing green sample preparation techniques that require small volumes of organic solvents hence generating negligible volumes of organic solvent waste. Pesticides were extracted and pre-concentrated from water by solid phase extraction (SPE) and headspace solid phase microextraction (HS-SPME) while supercritical fluid extraction (SFE) and pressurized fluid extraction (PFE) were employed for sediments. Subsequent analysis was carried out on a gas chromatograph with electron capture detection and analytes were unequivocally confirmed by high resolution mass spectrometric detection. Hexachlorobenzene (HCB), trans-chlordane, 4,4′-DDD and 4,4′-DDE were detected after optimized HS-SPME in several water samples from the lower Delta at concentrations ranging from 2.4 to 61.4 μg L-1 that are much higher than the 0.1 μg L-1 maximum limit of individual organochlorine pesticides in drinking water set by the European Community Directive. The same samples were cleaned with ISOLUTE C18 SPE sorbent with an optimal acetone/n-hexane (1:1 v/v) mixture for the elution of analytes. No pesticides were detected after SPE clean-up and pre-concentration. HCB, aldrin and 4, 4‟-DDT were identified in sediments after SFE at concentration ranges of 1.1 - 30.3, 0.5 – 15.2 and 1.4 – 55.4 μg/g, respectively. There was an increase of pesticides concentrations in the direction of water flow from the Panhandle (point of entry) to the lower delta. DDE, fatty acids and phthalates were detected after PFE with optimized extraction solvent and temperature. The presence of DDT metabolites in the water and sediments from the Okavango Delta confirm historical exposure to the pesticide. However their cumulative concentration increase in the water-flow direction calls for further investigation of point sources for the long-term preservation of the Delta. The green sample preparation techniques and low toxicity solvents employed in this thesis are thus recommended for routine environmental monitoring exercises.
- Full Text:
- Date Issued: 2010
- Authors: Mmualefe, Lesego Cecilia
- Date: 2010
- Subjects: Water quality -- Botswana -- Okavango Delta Water -- Analysis Pesticides -- Environmental aspects -- Botswana -- Okavango Delta Water -- Pollution -- Botswana -- Okavango Delta DDT (Insecticide) -- Environmental aspects -- Botswana -- Okavango Delta
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4344 , http://hdl.handle.net/10962/d1005006
- Description: This thesis presents a first ever extensive analysis of pesticides in water and sediments from the Okavango Delta, Botswana, employing green sample preparation techniques that require small volumes of organic solvents hence generating negligible volumes of organic solvent waste. Pesticides were extracted and pre-concentrated from water by solid phase extraction (SPE) and headspace solid phase microextraction (HS-SPME) while supercritical fluid extraction (SFE) and pressurized fluid extraction (PFE) were employed for sediments. Subsequent analysis was carried out on a gas chromatograph with electron capture detection and analytes were unequivocally confirmed by high resolution mass spectrometric detection. Hexachlorobenzene (HCB), trans-chlordane, 4,4′-DDD and 4,4′-DDE were detected after optimized HS-SPME in several water samples from the lower Delta at concentrations ranging from 2.4 to 61.4 μg L-1 that are much higher than the 0.1 μg L-1 maximum limit of individual organochlorine pesticides in drinking water set by the European Community Directive. The same samples were cleaned with ISOLUTE C18 SPE sorbent with an optimal acetone/n-hexane (1:1 v/v) mixture for the elution of analytes. No pesticides were detected after SPE clean-up and pre-concentration. HCB, aldrin and 4, 4‟-DDT were identified in sediments after SFE at concentration ranges of 1.1 - 30.3, 0.5 – 15.2 and 1.4 – 55.4 μg/g, respectively. There was an increase of pesticides concentrations in the direction of water flow from the Panhandle (point of entry) to the lower delta. DDE, fatty acids and phthalates were detected after PFE with optimized extraction solvent and temperature. The presence of DDT metabolites in the water and sediments from the Okavango Delta confirm historical exposure to the pesticide. However their cumulative concentration increase in the water-flow direction calls for further investigation of point sources for the long-term preservation of the Delta. The green sample preparation techniques and low toxicity solvents employed in this thesis are thus recommended for routine environmental monitoring exercises.
- Full Text:
- Date Issued: 2010
Self-efficacy and social support of academy cricketers
- Authors: Cowan, Jenna
- Date: 2010
- Subjects: Self-efficacy , Control (Psychology) , Social networks , Cricket players
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9859 , http://hdl.handle.net/10948/1556 , Self-efficacy , Control (Psychology) , Social networks , Cricket players
- Description: Self-efficacy is considered to be a significant variable for enhancing all aspects of human performance (Druckman, 2004). Social support may influence self-efficacy through each of the four channels of self-efficacy information which consist of performance accomplishments, vicarious experience, verbal persuasion and physiological responses (Bandura, 1997). The primary aim of this study was to explore and describe the nature of change that occurred in selfefficacy and received social support of university-age academy cricketers over the duration of an academy programme. The secondary aim was to explore and describe the relationship between the two constructs, self-efficacy and social support. Sixty-five male, university-age (18-25 years) provincial academy cricketers completed a social support measure and a self-efficacy measure specifically designed for the purposes of this study. These measures were based on Rees and Freeman’s (2007) items and Cox, Martens and Russell’s (2003) revised Competitive State Anxiety Inventory-2 (CSAI-2 - Martens, Burton, Vealey, Bump & Smith, 1990) respectively. The perceived pre- and post-academy personal ratings of self-efficacy and social support, obtained prior to the start of the South African Interprovincial Academy Cricket week, referred to participants’ perceptions before and after attending their respective provincial academies. An inferential pre-experimental post-pretest design was used. The results included significant changes found in self-efficacy, esteem social support, informational social support and tangible social support over the academy season. There were no differences attributed to the length of time a cricketer had spent at the academy or to the cricketer’s highest level of achievement in cricket. The only significant correlation that existed between self-efficacy and social support was the correlation between self-efficacy and x informational social support. This study provided an initial insight into the role of self-efficacy and social support in talented cricketers, especially in a South African context.
- Full Text:
- Date Issued: 2010
- Authors: Cowan, Jenna
- Date: 2010
- Subjects: Self-efficacy , Control (Psychology) , Social networks , Cricket players
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9859 , http://hdl.handle.net/10948/1556 , Self-efficacy , Control (Psychology) , Social networks , Cricket players
- Description: Self-efficacy is considered to be a significant variable for enhancing all aspects of human performance (Druckman, 2004). Social support may influence self-efficacy through each of the four channels of self-efficacy information which consist of performance accomplishments, vicarious experience, verbal persuasion and physiological responses (Bandura, 1997). The primary aim of this study was to explore and describe the nature of change that occurred in selfefficacy and received social support of university-age academy cricketers over the duration of an academy programme. The secondary aim was to explore and describe the relationship between the two constructs, self-efficacy and social support. Sixty-five male, university-age (18-25 years) provincial academy cricketers completed a social support measure and a self-efficacy measure specifically designed for the purposes of this study. These measures were based on Rees and Freeman’s (2007) items and Cox, Martens and Russell’s (2003) revised Competitive State Anxiety Inventory-2 (CSAI-2 - Martens, Burton, Vealey, Bump & Smith, 1990) respectively. The perceived pre- and post-academy personal ratings of self-efficacy and social support, obtained prior to the start of the South African Interprovincial Academy Cricket week, referred to participants’ perceptions before and after attending their respective provincial academies. An inferential pre-experimental post-pretest design was used. The results included significant changes found in self-efficacy, esteem social support, informational social support and tangible social support over the academy season. There were no differences attributed to the length of time a cricketer had spent at the academy or to the cricketer’s highest level of achievement in cricket. The only significant correlation that existed between self-efficacy and social support was the correlation between self-efficacy and x informational social support. This study provided an initial insight into the role of self-efficacy and social support in talented cricketers, especially in a South African context.
- Full Text:
- Date Issued: 2010
Unfair discrimination and dismissal based on age
- Thompson, David Martin Ogilvie
- Authors: Thompson, David Martin Ogilvie
- Date: 2010
- Subjects: Age discrimination in employment -- South Africa , Employees -- Dismissal of -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10218 , http://hdl.handle.net/10948/1287 , Age discrimination in employment -- South Africa , Employees -- Dismissal of -- South Africa
- Description: Section 187(2)(b) of the Labour Relations Act sets out certain justifications for what may seem to be unfair discrimination in the workplace. The purpose of this note is to discuss the provisions of Age Discrimination, with specific focus on the rights of older employees, who have reached, what some might term, the ‘normal or agreed retirement age’. In the discuss which follows reference will be made to the Constitution of the Republic of South Africa1 in order to investigate the provisions of our new democratic era, and what is said therein about discrimination, and age discrimination in particular. In our new Constitutional dispensation there have also been circumstances where certain kinds of discrimination have become accepted on society, for example Affirmative Action, and an enquiry into the difference between discrimination and differentiation will therefore also be necessary. The provisions of the Employment Equity Act,2 which deal specifically with eliminating unfair discrimination in the workplace, and the Labour Relations Act,3 which deals primarily with the rights of employees, employers and trade unions, and seeks to harmonize employer-employee relations will be discussed wherein specific reference will be made to section 187(2)(b) of the LRA. A further discussion will outline the circumstances of what is meant by dismissal in the context of age based dismissals, and whether such a dismissal is infact a dismissal and whether, within the requirements of the LRA such a dismissal, or termination of employment contract, is infact fair. Furthermore, a comparative perspective of other jurisdictions will give a more complete understanding of the issue of age-based dismissals within the current context. However, to refer to legislation and foreign decisions alone, while being of important reference, is not enough and a enquiry into our own case law will be of significant importance to determine a path of direction one can expect when faced with a question of dismissals based on mandatory retirement ages, and in particular, a dismissal which has been so executed with recourse to section 187(2)(b) of the LRA. In the various cases the reasoning and rationale behind the decision making will shed light on a seemingly unresolved area of labour law, and in reading further not only in the judgments but also in various articles, one will see that there are many arguments for and against the use of a mandatory retirement age, the most important of which will be highlighted.
- Full Text:
- Date Issued: 2010
- Authors: Thompson, David Martin Ogilvie
- Date: 2010
- Subjects: Age discrimination in employment -- South Africa , Employees -- Dismissal of -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10218 , http://hdl.handle.net/10948/1287 , Age discrimination in employment -- South Africa , Employees -- Dismissal of -- South Africa
- Description: Section 187(2)(b) of the Labour Relations Act sets out certain justifications for what may seem to be unfair discrimination in the workplace. The purpose of this note is to discuss the provisions of Age Discrimination, with specific focus on the rights of older employees, who have reached, what some might term, the ‘normal or agreed retirement age’. In the discuss which follows reference will be made to the Constitution of the Republic of South Africa1 in order to investigate the provisions of our new democratic era, and what is said therein about discrimination, and age discrimination in particular. In our new Constitutional dispensation there have also been circumstances where certain kinds of discrimination have become accepted on society, for example Affirmative Action, and an enquiry into the difference between discrimination and differentiation will therefore also be necessary. The provisions of the Employment Equity Act,2 which deal specifically with eliminating unfair discrimination in the workplace, and the Labour Relations Act,3 which deals primarily with the rights of employees, employers and trade unions, and seeks to harmonize employer-employee relations will be discussed wherein specific reference will be made to section 187(2)(b) of the LRA. A further discussion will outline the circumstances of what is meant by dismissal in the context of age based dismissals, and whether such a dismissal is infact a dismissal and whether, within the requirements of the LRA such a dismissal, or termination of employment contract, is infact fair. Furthermore, a comparative perspective of other jurisdictions will give a more complete understanding of the issue of age-based dismissals within the current context. However, to refer to legislation and foreign decisions alone, while being of important reference, is not enough and a enquiry into our own case law will be of significant importance to determine a path of direction one can expect when faced with a question of dismissals based on mandatory retirement ages, and in particular, a dismissal which has been so executed with recourse to section 187(2)(b) of the LRA. In the various cases the reasoning and rationale behind the decision making will shed light on a seemingly unresolved area of labour law, and in reading further not only in the judgments but also in various articles, one will see that there are many arguments for and against the use of a mandatory retirement age, the most important of which will be highlighted.
- Full Text:
- Date Issued: 2010
An analysis of the views of Minibus Taxi drivers and commuters to road safety : a case study of the Northern Areas of Port Elizabeth
- Authors: Ferreira, Bernice Aloma
- Date: 2010
- Subjects: Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8191 , http://hdl.handle.net/10948/1402 , Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Description: People without private transport are dependent on public transportation. Public transport, particularly minibus taxis, is the most popular mode of transport in the Northern Areas of Port Elizabeth. The objective of the minibus taxi industry is to provide public transport to minibus taxi commuters in an economically, reliable and safe manner. The focus of this case study was to explore and determine the views of minibus taxi commuters who utilised minibus taxis as a form of public transport, as well as the views of minibus taxi drivers in terms of adhering to road safety requirements on Stanford Road in Port Elizabeth. The literature survey revealed that transport in South Africa has had a political dimension arising from the Group Areas Act 41 of 1950. One consequence of this Act, which imposed residential segregation on the country, was that poor black commuters were forced to live far out of town, forcing them to travel long distances to places of work and commercial centres, with a commensurate increase in transport costs. Data was collected by means of two structured questionnaires which were administered to minibus taxi drivers and minibus taxi commuters to explore their views and experience of road safety on Stanford Road in Port Elizabeth. A discussion on the minibus taxi industry, minibus taxi associations and law enforcement agencies in Port Elizabeth, as well as the sustainability of the minibus taxi industry, followed in Chapter Three. Through this case study, valuable insight was gained regarding the minibus taxi industry and road safety in Port Elizabeth. Finally, recommendations to improve road safety were made.
- Full Text:
- Date Issued: 2010
- Authors: Ferreira, Bernice Aloma
- Date: 2010
- Subjects: Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8191 , http://hdl.handle.net/10948/1402 , Transportation -- South Africa -- Public opinion , Transportation -- South Africa -- Port Elizabeth , Urban transportation -- South Africa -- Port Elizabeth , Commuters -- South Africa -- Port Elizabeth , Commuting -- South Africa -- Port Elizabeth , Transportation -- Safety measures , Traffic safety -- South Africa
- Description: People without private transport are dependent on public transportation. Public transport, particularly minibus taxis, is the most popular mode of transport in the Northern Areas of Port Elizabeth. The objective of the minibus taxi industry is to provide public transport to minibus taxi commuters in an economically, reliable and safe manner. The focus of this case study was to explore and determine the views of minibus taxi commuters who utilised minibus taxis as a form of public transport, as well as the views of minibus taxi drivers in terms of adhering to road safety requirements on Stanford Road in Port Elizabeth. The literature survey revealed that transport in South Africa has had a political dimension arising from the Group Areas Act 41 of 1950. One consequence of this Act, which imposed residential segregation on the country, was that poor black commuters were forced to live far out of town, forcing them to travel long distances to places of work and commercial centres, with a commensurate increase in transport costs. Data was collected by means of two structured questionnaires which were administered to minibus taxi drivers and minibus taxi commuters to explore their views and experience of road safety on Stanford Road in Port Elizabeth. A discussion on the minibus taxi industry, minibus taxi associations and law enforcement agencies in Port Elizabeth, as well as the sustainability of the minibus taxi industry, followed in Chapter Three. Through this case study, valuable insight was gained regarding the minibus taxi industry and road safety in Port Elizabeth. Finally, recommendations to improve road safety were made.
- Full Text:
- Date Issued: 2010
Studies on the nutritional value of seven accessions of cocoyam growing in South Africa
- Authors: Lewu, Muinat Nike
- Date: 2010
- Subjects: Taro , Nutrition , Field crops -- Nutrition , Taro -- Nutritional aspects
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:11305 , http://hdl.handle.net/10353/d1001054 , Taro , Nutrition , Field crops -- Nutrition , Taro -- Nutritional aspects
- Description: Cocoyam [Colocasia esculenta (L.) Schott] is widely cultivated as a staple food in the tropical and subtropical regions of the world. The crop, however, remains unpopular and not well known outside KwaZulu-Natal Province of South Africa where it is cultivated mainly for subsistence. The aims of the study were to collect local landraces (accessions) of the crop from where it is found growing within the country for various studies and also to document its nutritional values as well as the safety/toxicity of the crop. The study was carried out using various methods. These included a comparative assessment of the proximate, mineral and antinutrient compositions of cooked and uncooked tubers of a typical commercially available cocoyam and potato found in South African markets. These investigations were repeated for the tubers and leaves of available landraces (seven accessions) of C. esculenta found growing in the farmers’ fields in KwaZulu-Natal Province. Also, an in vivo toxicological study on cooked accessions of the local landraces was conducted to determine possible toxicity effects after consumption using albino rats as a model. The results revealed that commercially available cocoyam and potato tubers have very close nutritional components. Analysis of the proximate composition of seven accessions (UFCe1- UFCe7) of cooked and uncooked tubers of cocoyam indicated that UFCe7 was better in ash, crude protein, crude fibre and crude lipid contents but with higher moisture which could make it more vulnerable to microbial attack. No tubers of the seven accessions appeared to be ii outstandingly better than the others based on their mineral compositions. However, in terms of antinutritional factors, UFCe1, UFCe3 and UFCe7 had the least amounts of oxalate, tannins and phytate in their cooked states. It was discovered however, that the leaves of the accessions of this vegetable contain substantial amount of minerals, and therefore, can contribute significantly to the nutrient requirements of humans and could be recommended as a cheap source of nutrients in South Africa. None of the accessions was outstandingly better than the others in terms of their mineral contents and anti-nutritional factors. Moreover, the current study has shown that boiling the leaves of cocoyam prior to consumption is an effective way of reducing the antinutrient contents of the leaves of the plant thereby making it safe for consumption. The findings also revealed that cooking C. esculenta leaves may increase the levels of protein, fibre and lipid contents while cooking may also decrease the mineral, carbohydrate and caloric contents of the leaves of the accessions. The leafy vegetable may, therefore, be recommended as a cheap source of plant protein. Cooking improved the nutritive value as a result of the reduction in antinutrient levels, thereby improving the food quality in all the tuber and leaf samples used for this study. At the same time, cooked samples also suffered loss of some nutrients with respect to the proximate and mineral compositions. However, supplementation from other food sources that are rich in these nutrients is necessary when these crops are cooked for consumption. Any of the cocoyam accessions may be recommended for consumption for improved protein and mineral nutrients while tubers of accession UFCe7 have also shown good promise in terms of protein and fibre content availability. The results of the in vivo study, using the liver and kidney functional endpoints of weanling albino rats (Rattus norvegicus) maintained on different accessions of cooked cocoyam-based iii diets (UFCe1-UFCe7) for 28 days, revealed that all the accessions produced selective alterations on the hepatorenal indices of weanling rats. The highest alterations were produced by UFCe4 while the least was from UFCe2. These alterations may have consequential effects on the normal functioning of the liver and kidney of the animals. The UFCe2 exhibited the least toxicity risk among the accessions of C. esculenta growing in KwaZulu-Natal Province of South Africa.
- Full Text:
- Date Issued: 2010
- Authors: Lewu, Muinat Nike
- Date: 2010
- Subjects: Taro , Nutrition , Field crops -- Nutrition , Taro -- Nutritional aspects
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:11305 , http://hdl.handle.net/10353/d1001054 , Taro , Nutrition , Field crops -- Nutrition , Taro -- Nutritional aspects
- Description: Cocoyam [Colocasia esculenta (L.) Schott] is widely cultivated as a staple food in the tropical and subtropical regions of the world. The crop, however, remains unpopular and not well known outside KwaZulu-Natal Province of South Africa where it is cultivated mainly for subsistence. The aims of the study were to collect local landraces (accessions) of the crop from where it is found growing within the country for various studies and also to document its nutritional values as well as the safety/toxicity of the crop. The study was carried out using various methods. These included a comparative assessment of the proximate, mineral and antinutrient compositions of cooked and uncooked tubers of a typical commercially available cocoyam and potato found in South African markets. These investigations were repeated for the tubers and leaves of available landraces (seven accessions) of C. esculenta found growing in the farmers’ fields in KwaZulu-Natal Province. Also, an in vivo toxicological study on cooked accessions of the local landraces was conducted to determine possible toxicity effects after consumption using albino rats as a model. The results revealed that commercially available cocoyam and potato tubers have very close nutritional components. Analysis of the proximate composition of seven accessions (UFCe1- UFCe7) of cooked and uncooked tubers of cocoyam indicated that UFCe7 was better in ash, crude protein, crude fibre and crude lipid contents but with higher moisture which could make it more vulnerable to microbial attack. No tubers of the seven accessions appeared to be ii outstandingly better than the others based on their mineral compositions. However, in terms of antinutritional factors, UFCe1, UFCe3 and UFCe7 had the least amounts of oxalate, tannins and phytate in their cooked states. It was discovered however, that the leaves of the accessions of this vegetable contain substantial amount of minerals, and therefore, can contribute significantly to the nutrient requirements of humans and could be recommended as a cheap source of nutrients in South Africa. None of the accessions was outstandingly better than the others in terms of their mineral contents and anti-nutritional factors. Moreover, the current study has shown that boiling the leaves of cocoyam prior to consumption is an effective way of reducing the antinutrient contents of the leaves of the plant thereby making it safe for consumption. The findings also revealed that cooking C. esculenta leaves may increase the levels of protein, fibre and lipid contents while cooking may also decrease the mineral, carbohydrate and caloric contents of the leaves of the accessions. The leafy vegetable may, therefore, be recommended as a cheap source of plant protein. Cooking improved the nutritive value as a result of the reduction in antinutrient levels, thereby improving the food quality in all the tuber and leaf samples used for this study. At the same time, cooked samples also suffered loss of some nutrients with respect to the proximate and mineral compositions. However, supplementation from other food sources that are rich in these nutrients is necessary when these crops are cooked for consumption. Any of the cocoyam accessions may be recommended for consumption for improved protein and mineral nutrients while tubers of accession UFCe7 have also shown good promise in terms of protein and fibre content availability. The results of the in vivo study, using the liver and kidney functional endpoints of weanling albino rats (Rattus norvegicus) maintained on different accessions of cooked cocoyam-based iii diets (UFCe1-UFCe7) for 28 days, revealed that all the accessions produced selective alterations on the hepatorenal indices of weanling rats. The highest alterations were produced by UFCe4 while the least was from UFCe2. These alterations may have consequential effects on the normal functioning of the liver and kidney of the animals. The UFCe2 exhibited the least toxicity risk among the accessions of C. esculenta growing in KwaZulu-Natal Province of South Africa.
- Full Text:
- Date Issued: 2010
Structure and functioning of fish assemblages in two South African estuaries, with emphasis on the presence and absence of aquatic macrophyte beds
- Authors: Sheppard, Jill Nicole
- Date: 2010
- Subjects: Estuaries -- South Africa -- Eastern Cape , Estuarine ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5321 , http://hdl.handle.net/10962/d1005166 , Estuaries -- South Africa -- Eastern Cape , Estuarine ecology -- South Africa -- Eastern Cape
- Description: Temporarily open/closed estuaries (TOCEs) are the dominant estuary type in South Africa. These systems are often characterized by extensive beds of submerged macrophytes, which form important foraging and shelter habitats for fishes, especially for estuary-dependent fish species such as the Cape stumpnose Rhabdosargus holubi and Cape moony Monodactylus falciformis that are commonly associated with them. A loss of submerged macrophytes from an estuary has been shown to affect the fish community as well as reducing overall system productivity. The TOC East Kleinemonde Estuary, situated in the warm-temperate biogeographic region of South Africa has been subject to an ongoing long-term fish monitoring project since 1995. During the period 1995 to 2002, this estuary contained large beds of the submerged macrophytes Ruppia cirrhosa and Potamogeton pectinatus. However, subsequent to a major flood event in 2003 these macrophytes have been largely absent from this system. The effect of the loss of submerged macrophytes on the East Kleinemonde fish assemblage was investigated through an analysis of seine and gill net catch data. Seine net catches for a 12 year period, encompassing six years of macrophyte presence and six years of macrophyte senescence, revealed changes in the relative abundance of certain fish species. Vegetation-associated species such as R. holubi and M. falciformis decreased in abundance whereas sediment-associated species, especially members of the family Mugilidae, increased in abundance following loss of the macrophytes in this estuary. The critically endangered pipefish Syngnathus watermeyeri was only recorded in catches during years in which macrophyte beds were present. In addition to the analysis of catch data, the importance of macrophytes as a primary energy source for selected estuarine fishes was explored through the analysis of carbon and nitrogen stable isotopes. Prior to conducting these analyses, common methodological practices to address the presence of carbonates and lipids within isotope samples were evaluated. A subset of samples were either acid washed to remove carbonates, or lipids were removed according to the method of Bligh and Dyer (1959) as both of these compounds have been shown to affect stable carbon and nitrogen isotope ratios. The suitability of the lipid normalization models of Fry (2002) and Post et al. (2007) for samples of estuarine fish muscle were also tested. Based on this evaluation both models are suitable for use with estuarine fish muscle tissue, however since neither carbonate nor lipid content of any of the samples used in this study was high all samples were left untreated in the following analysis. Carbon isotope ratios from a wide range of fish species collected from the East Kleinemonde Estuary during the macrophyte-senescent phase were compared with individuals of the same species from the neighbouring West Kleinemonde Estuary (where extensive beds of R. cirrhosa and P. pectinatus were present) and revealed the influence of submerged macrophyte material in the diet of fishes in the latter system. However, it was apparent that these plants are not directly consumed but rather contribute to the detrital pool that forms a food source for most invertebrate and some fish species. The most significant source of carbon for East Kleinemonde fishes during the macrophyte senescent phase appeared to have a more depleted origin; probably from benthic or pelagic microalgae. In conclusion, while the importance of macrophyte beds as shelter and foraging habitats for estuarine fishes are well documented, their role in terms of the structuring and functioning of fish assemblages in TOCEs remains somewhat uncertain. The findings of this study were possibly masked by the resilience of vegetation-associated species to the loss of this habitat, as well as by life history characteristics of species such as R. holubi that allow their numerical dominance despite habitat change. Nonetheless, macrophyte senescence in the East Kleinemonde Estuary resulted in the loss of at least one species and the reduced abundance of vegetation-associated species, probably reflective of reduced food resources and/or increased vulnerability to predation. As a result, beds of submerged macrophytes are an important habitat within TOCEs.
- Full Text:
- Date Issued: 2010
- Authors: Sheppard, Jill Nicole
- Date: 2010
- Subjects: Estuaries -- South Africa -- Eastern Cape , Estuarine ecology -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5321 , http://hdl.handle.net/10962/d1005166 , Estuaries -- South Africa -- Eastern Cape , Estuarine ecology -- South Africa -- Eastern Cape
- Description: Temporarily open/closed estuaries (TOCEs) are the dominant estuary type in South Africa. These systems are often characterized by extensive beds of submerged macrophytes, which form important foraging and shelter habitats for fishes, especially for estuary-dependent fish species such as the Cape stumpnose Rhabdosargus holubi and Cape moony Monodactylus falciformis that are commonly associated with them. A loss of submerged macrophytes from an estuary has been shown to affect the fish community as well as reducing overall system productivity. The TOC East Kleinemonde Estuary, situated in the warm-temperate biogeographic region of South Africa has been subject to an ongoing long-term fish monitoring project since 1995. During the period 1995 to 2002, this estuary contained large beds of the submerged macrophytes Ruppia cirrhosa and Potamogeton pectinatus. However, subsequent to a major flood event in 2003 these macrophytes have been largely absent from this system. The effect of the loss of submerged macrophytes on the East Kleinemonde fish assemblage was investigated through an analysis of seine and gill net catch data. Seine net catches for a 12 year period, encompassing six years of macrophyte presence and six years of macrophyte senescence, revealed changes in the relative abundance of certain fish species. Vegetation-associated species such as R. holubi and M. falciformis decreased in abundance whereas sediment-associated species, especially members of the family Mugilidae, increased in abundance following loss of the macrophytes in this estuary. The critically endangered pipefish Syngnathus watermeyeri was only recorded in catches during years in which macrophyte beds were present. In addition to the analysis of catch data, the importance of macrophytes as a primary energy source for selected estuarine fishes was explored through the analysis of carbon and nitrogen stable isotopes. Prior to conducting these analyses, common methodological practices to address the presence of carbonates and lipids within isotope samples were evaluated. A subset of samples were either acid washed to remove carbonates, or lipids were removed according to the method of Bligh and Dyer (1959) as both of these compounds have been shown to affect stable carbon and nitrogen isotope ratios. The suitability of the lipid normalization models of Fry (2002) and Post et al. (2007) for samples of estuarine fish muscle were also tested. Based on this evaluation both models are suitable for use with estuarine fish muscle tissue, however since neither carbonate nor lipid content of any of the samples used in this study was high all samples were left untreated in the following analysis. Carbon isotope ratios from a wide range of fish species collected from the East Kleinemonde Estuary during the macrophyte-senescent phase were compared with individuals of the same species from the neighbouring West Kleinemonde Estuary (where extensive beds of R. cirrhosa and P. pectinatus were present) and revealed the influence of submerged macrophyte material in the diet of fishes in the latter system. However, it was apparent that these plants are not directly consumed but rather contribute to the detrital pool that forms a food source for most invertebrate and some fish species. The most significant source of carbon for East Kleinemonde fishes during the macrophyte senescent phase appeared to have a more depleted origin; probably from benthic or pelagic microalgae. In conclusion, while the importance of macrophyte beds as shelter and foraging habitats for estuarine fishes are well documented, their role in terms of the structuring and functioning of fish assemblages in TOCEs remains somewhat uncertain. The findings of this study were possibly masked by the resilience of vegetation-associated species to the loss of this habitat, as well as by life history characteristics of species such as R. holubi that allow their numerical dominance despite habitat change. Nonetheless, macrophyte senescence in the East Kleinemonde Estuary resulted in the loss of at least one species and the reduced abundance of vegetation-associated species, probably reflective of reduced food resources and/or increased vulnerability to predation. As a result, beds of submerged macrophytes are an important habitat within TOCEs.
- Full Text:
- Date Issued: 2010
Therapist metamorphosis : beginner and experienced psychotherapists' journeys of professional therapeutic development
- Authors: Laidlaw, Christine
- Date: 2010
- Subjects: Clinical psychologists -- Training of -- South Africa , Interns (Clinical psychology) -- Training of -- South Africa , Psychotherapy -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9866 , http://hdl.handle.net/10948/d1007912 , Clinical psychologists -- Training of -- South Africa , Interns (Clinical psychology) -- Training of -- South Africa , Psychotherapy -- South Africa
- Description: This research aimed to trace the development of psychologists as therapists within a South African context. Two distinct career levels were explored in relation to a competency model, a skills development model, and a developmental phase model of psychotherapists' professional development. Through purposive sampling five intern psychologists and six registered psychologists with at least seven years post-qualification client contact were selected according to the inclusion criteria of the study. Through semi-structured interviews, couched in the social constructionist position, the participants' experiences were thematically analysed. In addition, the researcher's own personal journey of developing as a psychotherapist was reflected upon. The current research study found that a number of aspects fostered the development of psychotherapists. Across the two career levels the life experiences of participants particularly featured events that were personally wounding or placed the participant in the helper role. The theoretical orientation(s) of participants were voiced as influential in their development, yet the ability to adjust their theoretical orientation to clients' needs was of overriding importance. Participants emphasised forming a strong therapeutic relationship with clients as the centrepiece of psychotherapy and depicted the therapeutic process using diverse metaphors. No key differences in use of metaphors emerged between intern and established psychologists. Catalysts for professional growth included personal therapy, "unforgettable cases", group supervision and, in the case of established psychologists, continuing professional development workshops. xiii Shifts in competency were recognised by intern psychologists as they gained more experience, namely, dissolution of naivety, a decrease in anxiety regarding their clinical work, a greater flexibility in the therapeutic process, a decreased sense of inappropriate responsibility for clients' progress, and an ongoing process of negotiating the interface of their personal and professional lives. Established psychologists spoke of having gained more confidence through their years of practice and yet experienced moments of anxiety which they found fostered humility. Limitations of the study and potential future research directions were outlined.
- Full Text:
- Date Issued: 2010
- Authors: Laidlaw, Christine
- Date: 2010
- Subjects: Clinical psychologists -- Training of -- South Africa , Interns (Clinical psychology) -- Training of -- South Africa , Psychotherapy -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9866 , http://hdl.handle.net/10948/d1007912 , Clinical psychologists -- Training of -- South Africa , Interns (Clinical psychology) -- Training of -- South Africa , Psychotherapy -- South Africa
- Description: This research aimed to trace the development of psychologists as therapists within a South African context. Two distinct career levels were explored in relation to a competency model, a skills development model, and a developmental phase model of psychotherapists' professional development. Through purposive sampling five intern psychologists and six registered psychologists with at least seven years post-qualification client contact were selected according to the inclusion criteria of the study. Through semi-structured interviews, couched in the social constructionist position, the participants' experiences were thematically analysed. In addition, the researcher's own personal journey of developing as a psychotherapist was reflected upon. The current research study found that a number of aspects fostered the development of psychotherapists. Across the two career levels the life experiences of participants particularly featured events that were personally wounding or placed the participant in the helper role. The theoretical orientation(s) of participants were voiced as influential in their development, yet the ability to adjust their theoretical orientation to clients' needs was of overriding importance. Participants emphasised forming a strong therapeutic relationship with clients as the centrepiece of psychotherapy and depicted the therapeutic process using diverse metaphors. No key differences in use of metaphors emerged between intern and established psychologists. Catalysts for professional growth included personal therapy, "unforgettable cases", group supervision and, in the case of established psychologists, continuing professional development workshops. xiii Shifts in competency were recognised by intern psychologists as they gained more experience, namely, dissolution of naivety, a decrease in anxiety regarding their clinical work, a greater flexibility in the therapeutic process, a decreased sense of inappropriate responsibility for clients' progress, and an ongoing process of negotiating the interface of their personal and professional lives. Established psychologists spoke of having gained more confidence through their years of practice and yet experienced moments of anxiety which they found fostered humility. Limitations of the study and potential future research directions were outlined.
- Full Text:
- Date Issued: 2010
Implementation of the dual therapy prevention of mother-to-child transmission protocol
- Authors: Singh, Vikesh
- Date: 2010
- Subjects: HIV infections -- Transmission -- South Africa , AIDS (Disease) in pregnancy -- Prevention -- South Africa , Antiretroviral agents
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: vital:10138 , http://hdl.handle.net/10948/1374 , HIV infections -- Transmission -- South Africa , AIDS (Disease) in pregnancy -- Prevention -- South Africa , Antiretroviral agents
- Description: Antiretroviral drugs taken during pregnancy, reduce the rates of mother-to-child transmission from 35 percent to as low as 1 to 2 percent (UNAIDS, 2009). In 2002, the Prevention of Mother-to-Child Transmission (PMTCT) programme was implemented in South Africa. Studies on the implementation of the PMTCT programme have shown that understaffed and under-developed health care facilities were key barriers to the provision of PMTCT services (Health Systems Trust, 2002: 6; Skinner et al., 2003). The aim of this study was to assess the challenges experienced by health care workers working in public sector facilities in the Nelson Mandela Metropole after implementation of the dual therapy PMTCT programme. Four areas were investigated: Infrastructure; Drug Supply Management; Clinic Procedures and Staffing. A quantitative descriptive study was conducted in August 2009 at nine public health care facilities in the Nelson Mandela Metropole, South Africa. Questionnaires were issued to 81 nurses and 41 pharmacy personnel (pharmacists and pharmacist assistants). Checklist audit forms were issued to the Facility Manager of each facility and completed with the researcher. The key findings for Infrastructure were lack of space at patient waiting rooms (9; 100 percent n=9), counselling area (5; 55.5 percent; n=9), nurse consultation rooms (6; 66.6 percent; n=9), storage areas (5; 55.5 percent; n=9) and filing areas (7; 77.7 percent; n=9). The key findings for Drug Supply Management were none of the dispensaries (0 percent; n=10) were fully compliant with Good Pharmacy Practice, pharmacy personnel indicated that there were no stock cards for medication (13; 31.7 percent; n=41); there was less than two weeks supply of buffer stock kept for zidovudine and nevirapine (13; 35.1percent; n=37) and medication orders were placed without any reference to minimum and maximum levels of medication (15; 36.5 percent; n=41) . The key findings for Clinic Procedures were only two facilities followed up on patients that had missed appointments (22.2 percent; n=9) and four facilities (44.4 percent; n=9) had a tracking system for patients that had defaulted. Of the nine facilities only three (33.3 percent; n=9) updated patient demographic details regularly. The key findings for Staffing were a shortage of doctors, nurses, counsellors and pharmacists at the facilities. One of the major challenges identified was the lack of training offered on new PMTCT protocols with 56.2 percent (45; n=80) of the nurses stating that no training was provided on the dual PMTCT protocol. Only 54.3 percent (44; n=81) of nurses stated that they knew the criteria to start the mother on dual PMTCT therapy. In conclusion there is an urgent need for barriers such as lack of staff, lack of space, lack of training on PMTCT and standard procedures for follow up of patients to be addressed in order to ensure the successful scaling up of PMTCT.
- Full Text:
- Date Issued: 2010
- Authors: Singh, Vikesh
- Date: 2010
- Subjects: HIV infections -- Transmission -- South Africa , AIDS (Disease) in pregnancy -- Prevention -- South Africa , Antiretroviral agents
- Language: English
- Type: Thesis , Masters , MPharm
- Identifier: vital:10138 , http://hdl.handle.net/10948/1374 , HIV infections -- Transmission -- South Africa , AIDS (Disease) in pregnancy -- Prevention -- South Africa , Antiretroviral agents
- Description: Antiretroviral drugs taken during pregnancy, reduce the rates of mother-to-child transmission from 35 percent to as low as 1 to 2 percent (UNAIDS, 2009). In 2002, the Prevention of Mother-to-Child Transmission (PMTCT) programme was implemented in South Africa. Studies on the implementation of the PMTCT programme have shown that understaffed and under-developed health care facilities were key barriers to the provision of PMTCT services (Health Systems Trust, 2002: 6; Skinner et al., 2003). The aim of this study was to assess the challenges experienced by health care workers working in public sector facilities in the Nelson Mandela Metropole after implementation of the dual therapy PMTCT programme. Four areas were investigated: Infrastructure; Drug Supply Management; Clinic Procedures and Staffing. A quantitative descriptive study was conducted in August 2009 at nine public health care facilities in the Nelson Mandela Metropole, South Africa. Questionnaires were issued to 81 nurses and 41 pharmacy personnel (pharmacists and pharmacist assistants). Checklist audit forms were issued to the Facility Manager of each facility and completed with the researcher. The key findings for Infrastructure were lack of space at patient waiting rooms (9; 100 percent n=9), counselling area (5; 55.5 percent; n=9), nurse consultation rooms (6; 66.6 percent; n=9), storage areas (5; 55.5 percent; n=9) and filing areas (7; 77.7 percent; n=9). The key findings for Drug Supply Management were none of the dispensaries (0 percent; n=10) were fully compliant with Good Pharmacy Practice, pharmacy personnel indicated that there were no stock cards for medication (13; 31.7 percent; n=41); there was less than two weeks supply of buffer stock kept for zidovudine and nevirapine (13; 35.1percent; n=37) and medication orders were placed without any reference to minimum and maximum levels of medication (15; 36.5 percent; n=41) . The key findings for Clinic Procedures were only two facilities followed up on patients that had missed appointments (22.2 percent; n=9) and four facilities (44.4 percent; n=9) had a tracking system for patients that had defaulted. Of the nine facilities only three (33.3 percent; n=9) updated patient demographic details regularly. The key findings for Staffing were a shortage of doctors, nurses, counsellors and pharmacists at the facilities. One of the major challenges identified was the lack of training offered on new PMTCT protocols with 56.2 percent (45; n=80) of the nurses stating that no training was provided on the dual PMTCT protocol. Only 54.3 percent (44; n=81) of nurses stated that they knew the criteria to start the mother on dual PMTCT therapy. In conclusion there is an urgent need for barriers such as lack of staff, lack of space, lack of training on PMTCT and standard procedures for follow up of patients to be addressed in order to ensure the successful scaling up of PMTCT.
- Full Text:
- Date Issued: 2010
Reflections of a Mathematician
- Authors: Mishra, S N
- Date: 2010
- Subjects: Mathematics
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/11260/758 , vital:29750
- Description: In this lecture, an attempt is made to convey in a broad sense about mathematics and its applications and the impact it has made outside its own domain. While doing so, we try to dispel the belief (held in certain quarters) that there are two types of mathematics, namely useful mathematics and not so useful mathematics. An attempt is also made to reflect on the role of mathematics in industry along with the challenges of teaching of mathematics in the current environment.
- Full Text:
- Date Issued: 2010
- Authors: Mishra, S N
- Date: 2010
- Subjects: Mathematics
- Language: English
- Type: text , Lectures
- Identifier: http://hdl.handle.net/11260/758 , vital:29750
- Description: In this lecture, an attempt is made to convey in a broad sense about mathematics and its applications and the impact it has made outside its own domain. While doing so, we try to dispel the belief (held in certain quarters) that there are two types of mathematics, namely useful mathematics and not so useful mathematics. An attempt is also made to reflect on the role of mathematics in industry along with the challenges of teaching of mathematics in the current environment.
- Full Text:
- Date Issued: 2010
Participatory human development in post-apartheid South Africa: a discussion of the 2006/7 Tantyi Youth Empowerment Project
- Authors: Kulundu, Injairu M
- Date: 2010
- Subjects: Spirals Trust (South Africa) Community development -- South Africa -- Citizen participation Economic development projects -- South Africa -- Citizen participation Youth in development -- South Africa Non-governmental organizations -- South Africa Post-apartheid era -- South Africa South Africa -- Politics and government -- 1994-
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2791 , http://hdl.handle.net/10962/d1003001
- Description: This thesis relates the work of a non-governmental organisation, The Spirals Trust, to discussions on human and participatory development. The focus of the study is one of The Spirals Trust’s projects, the 2006/7 Tantyi Youth Empowerment Project, which is discussed in relation to theoretical material on human development and participatory development. Collectively these perspectives are defined in this thesis as ‘participatory human development’. The 2006/7 Tantyi Youth Empowerment Project illustrates some of the challenges that face the practice of participatory human development. Workshops and focus group interviews were conducted with participants who were part of the 2006/7 Tantyi Youth Empowerment Project in order to draw out their experiences of the project. Questions were created from themes that emerged from the participants’ discussion of their experiences and these questions were then posed to members of staff of The Spirals Trust. The experiences of both the participants and the staff members are discussed in order to explore issues that emerge in the practice of participatory human development in the 2006/7 Tantyi Youth Empowerment Project. The results highlight the challenges of putting into action the tenets of participatory human development. Feedback showed that a focus on personal development can help cultivate the ethic of participation. The effort that this entailed on the part of facilitators is discussed. The importance of exposing and continually working with power dynamics that may emerge in projects of this nature is revealed and the eroding influence of bureaucratic compliance in projects like this one is explored. The study also suggests that there is a need to promote development initiatives that challenge the political status quo rather than just finding ways to incorporate the marginalised more effectively into current systems. New questions that the research poses to the practice of participatory human development are considered in conjunction with suggestions for further research.
- Full Text:
- Date Issued: 2010
- Authors: Kulundu, Injairu M
- Date: 2010
- Subjects: Spirals Trust (South Africa) Community development -- South Africa -- Citizen participation Economic development projects -- South Africa -- Citizen participation Youth in development -- South Africa Non-governmental organizations -- South Africa Post-apartheid era -- South Africa South Africa -- Politics and government -- 1994-
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2791 , http://hdl.handle.net/10962/d1003001
- Description: This thesis relates the work of a non-governmental organisation, The Spirals Trust, to discussions on human and participatory development. The focus of the study is one of The Spirals Trust’s projects, the 2006/7 Tantyi Youth Empowerment Project, which is discussed in relation to theoretical material on human development and participatory development. Collectively these perspectives are defined in this thesis as ‘participatory human development’. The 2006/7 Tantyi Youth Empowerment Project illustrates some of the challenges that face the practice of participatory human development. Workshops and focus group interviews were conducted with participants who were part of the 2006/7 Tantyi Youth Empowerment Project in order to draw out their experiences of the project. Questions were created from themes that emerged from the participants’ discussion of their experiences and these questions were then posed to members of staff of The Spirals Trust. The experiences of both the participants and the staff members are discussed in order to explore issues that emerge in the practice of participatory human development in the 2006/7 Tantyi Youth Empowerment Project. The results highlight the challenges of putting into action the tenets of participatory human development. Feedback showed that a focus on personal development can help cultivate the ethic of participation. The effort that this entailed on the part of facilitators is discussed. The importance of exposing and continually working with power dynamics that may emerge in projects of this nature is revealed and the eroding influence of bureaucratic compliance in projects like this one is explored. The study also suggests that there is a need to promote development initiatives that challenge the political status quo rather than just finding ways to incorporate the marginalised more effectively into current systems. New questions that the research poses to the practice of participatory human development are considered in conjunction with suggestions for further research.
- Full Text:
- Date Issued: 2010
The role of traditional leadership in governance and rural development: a case study of the Mpumalanga traditional authority
- Authors: George, Khanyisa
- Date: 2010
- Subjects: Leadership -- South Africa -- Eastern Cape , Community leadership -- South Africa -- Eastern Cape , Chiefdoms -- South Africa -- Eastern Cape , Local government -- South Africa -- Eastern Cape , Community development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9038 , http://hdl.handle.net/10948/1575 , Leadership -- South Africa -- Eastern Cape , Community leadership -- South Africa -- Eastern Cape , Chiefdoms -- South Africa -- Eastern Cape , Local government -- South Africa -- Eastern Cape , Community development -- South Africa -- Eastern Cape
- Description: This study examines how well the Mgwalana Traditional Authority (MTA) is performing its role of governing and developing its area and the municipal area of Nkonkobe in the Province of the Eastern Cape. The Chief of the MTA is one of the 2400 traditional leaders in South Africa who are responsible for giving leadership and development services to approximately 16 million people living in the rural areas. This study tries to find answers to two research questions: 1) What role does the Mgwalana traditional council play in governance and development? 2) Has the South African government managed to add traditional leadership to the local government structures? The study shows that the MTA is finding it difficult to do much socio-economic development because the Nkonkobe Local Municipality considers governance and development as its own role, and the traditional leadership is supposed to join only in customary and cultural activities. The research concludes that these two bodies could move out of the cross-road if they were to follow the Traditional Leadership and Governance Framework Act, 2003 (Act 41 of 2003), and if the municipality were to work with local stakeholders, including the MTA, to achieve the goals for local government laid down in section 152 of the Constitution of the Republic of South Africa, 1996.
- Full Text:
- Date Issued: 2010
- Authors: George, Khanyisa
- Date: 2010
- Subjects: Leadership -- South Africa -- Eastern Cape , Community leadership -- South Africa -- Eastern Cape , Chiefdoms -- South Africa -- Eastern Cape , Local government -- South Africa -- Eastern Cape , Community development -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9038 , http://hdl.handle.net/10948/1575 , Leadership -- South Africa -- Eastern Cape , Community leadership -- South Africa -- Eastern Cape , Chiefdoms -- South Africa -- Eastern Cape , Local government -- South Africa -- Eastern Cape , Community development -- South Africa -- Eastern Cape
- Description: This study examines how well the Mgwalana Traditional Authority (MTA) is performing its role of governing and developing its area and the municipal area of Nkonkobe in the Province of the Eastern Cape. The Chief of the MTA is one of the 2400 traditional leaders in South Africa who are responsible for giving leadership and development services to approximately 16 million people living in the rural areas. This study tries to find answers to two research questions: 1) What role does the Mgwalana traditional council play in governance and development? 2) Has the South African government managed to add traditional leadership to the local government structures? The study shows that the MTA is finding it difficult to do much socio-economic development because the Nkonkobe Local Municipality considers governance and development as its own role, and the traditional leadership is supposed to join only in customary and cultural activities. The research concludes that these two bodies could move out of the cross-road if they were to follow the Traditional Leadership and Governance Framework Act, 2003 (Act 41 of 2003), and if the municipality were to work with local stakeholders, including the MTA, to achieve the goals for local government laid down in section 152 of the Constitution of the Republic of South Africa, 1996.
- Full Text:
- Date Issued: 2010
Fluorescence quenching and energy transfer in conjugates of quantum dots with zinc and indium tetraamino phthalocyanines
- Britton, Jonathan, Antunes, Edith M, Nyokong, Tebello
- Authors: Britton, Jonathan , Antunes, Edith M , Nyokong, Tebello
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/262638 , vital:53539 , xlink:href="https://doi.org/10.1016/j.jphotochem.2009.12.013"
- Description: CdTe QDs capped with mercapto propionic acid (MPA) and thioglycolic acid (TGA) were covalently linked to zinc and indium tetraaminophthalocyanines (TAPcs) using N-ethyl-N(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxy succinimide (NHS) as the coupling agents. The results presented give evidence in favour of formation of an amide bond between the MTAPc and CdTe QDs. Both the linked ZnTAPc–QD complexes and the mixture of QDs and ZnTAPc (without chemical linking) showed Förster resonance energy transfer (FRET), whereas the QD interactions with InTAPc yielded no evidence of FRET. Both MTAPcs quenched the QDs emission, with quenching constants of the order of 103–104 M−1. High energy transfer efficiencies were obtained in some cases (as high as 93%), due to the low donor to acceptor distances.
- Full Text:
- Date Issued: 2010
- Authors: Britton, Jonathan , Antunes, Edith M , Nyokong, Tebello
- Date: 2010
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/262638 , vital:53539 , xlink:href="https://doi.org/10.1016/j.jphotochem.2009.12.013"
- Description: CdTe QDs capped with mercapto propionic acid (MPA) and thioglycolic acid (TGA) were covalently linked to zinc and indium tetraaminophthalocyanines (TAPcs) using N-ethyl-N(3-dimethylaminopropyl) carbodiimide (EDC) and N-hydroxy succinimide (NHS) as the coupling agents. The results presented give evidence in favour of formation of an amide bond between the MTAPc and CdTe QDs. Both the linked ZnTAPc–QD complexes and the mixture of QDs and ZnTAPc (without chemical linking) showed Förster resonance energy transfer (FRET), whereas the QD interactions with InTAPc yielded no evidence of FRET. Both MTAPcs quenched the QDs emission, with quenching constants of the order of 103–104 M−1. High energy transfer efficiencies were obtained in some cases (as high as 93%), due to the low donor to acceptor distances.
- Full Text:
- Date Issued: 2010
Connectivity between marine reserves and exploited areas in the philopatric reef fish Chrysoblephus laticeps (Teleostei: Sparidae)
- Teske, Peter R, Forget, F R G, Cowley, Paul D, Von der Heyden, S, Beheregaray, L B
- Authors: Teske, Peter R , Forget, F R G , Cowley, Paul D , Von der Heyden, S , Beheregaray, L B
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6776 , http://hdl.handle.net/10962/d1008086
- Description: "No-take‟ Marine Protected Areas (MPAs) are successful in protecting populations of many exploited fish species, but it is often unclear whether networks of MPAs are adequately spaced to ensure connectivity among reserves, and whether spillover occurs into adjacent exploited areas. Such issues are particularly important in species with low dispersal potential, many of which exist as genetically distinct regional stocks.The roman, Chrysoblephus laticeps, is an overexploited, commercially important fishery species endemic to South Africa. Post-recruits display resident behavior and occupy small home ranges, making C. laticeps a suitable model species to investigate connectivity in marine teleosts with potentially low dispersal ability. We used multilocus data from two types of highly variable genetic markers (mitochondrial DNA control region and microsatellites) to clarify patterns of genetic connectivity and population structure in C. laticeps using samples from two MPAs and several moderately or severely exploited regions. Despite using analytical tools that are sensitive to detect even subtle genetic structure, we found that this species exists as a single, well-mixed stock throughout its core distribution. This finding lends supports to the status of MPAs as an adequate tool for managing overexploited marine teleosts. Even though adult dispersal out of MPAs is limited, the fact that the large adults in these reserves produce exponentially more offspring than their smaller counterparts in exploited areas makes MPAs a rich source of recruits. We nonetheless caution against concluding that the lack of structure identified in C. laticeps and several other southern African teleosts can be considered to be representative of marine teleosts in this region in general. Many such species are represented in more than one marine biogeographic province and may be comprised of regionally-adapted stocks that need to be managed individually.
- Full Text:
- Date Issued: 2010
- Authors: Teske, Peter R , Forget, F R G , Cowley, Paul D , Von der Heyden, S , Beheregaray, L B
- Date: 2010
- Language: English
- Type: Article
- Identifier: vital:6776 , http://hdl.handle.net/10962/d1008086
- Description: "No-take‟ Marine Protected Areas (MPAs) are successful in protecting populations of many exploited fish species, but it is often unclear whether networks of MPAs are adequately spaced to ensure connectivity among reserves, and whether spillover occurs into adjacent exploited areas. Such issues are particularly important in species with low dispersal potential, many of which exist as genetically distinct regional stocks.The roman, Chrysoblephus laticeps, is an overexploited, commercially important fishery species endemic to South Africa. Post-recruits display resident behavior and occupy small home ranges, making C. laticeps a suitable model species to investigate connectivity in marine teleosts with potentially low dispersal ability. We used multilocus data from two types of highly variable genetic markers (mitochondrial DNA control region and microsatellites) to clarify patterns of genetic connectivity and population structure in C. laticeps using samples from two MPAs and several moderately or severely exploited regions. Despite using analytical tools that are sensitive to detect even subtle genetic structure, we found that this species exists as a single, well-mixed stock throughout its core distribution. This finding lends supports to the status of MPAs as an adequate tool for managing overexploited marine teleosts. Even though adult dispersal out of MPAs is limited, the fact that the large adults in these reserves produce exponentially more offspring than their smaller counterparts in exploited areas makes MPAs a rich source of recruits. We nonetheless caution against concluding that the lack of structure identified in C. laticeps and several other southern African teleosts can be considered to be representative of marine teleosts in this region in general. Many such species are represented in more than one marine biogeographic province and may be comprised of regionally-adapted stocks that need to be managed individually.
- Full Text:
- Date Issued: 2010
The isolation of muscle activity and ground reaction force patterns associated with postural control in four load manipulation tasks
- Authors: Pettengell, Clare Louise
- Date: 2010
- Subjects: Physical fitness , Exercise , Materials handling , Manual work , Lifting and carrying
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5125 , http://hdl.handle.net/10962/d1005203 , Physical fitness , Exercise , Materials handling , Manual work , Lifting and carrying
- Description: Although much effort has been placed into the reduction of risks associated with manual materials handling, risk of musculoskeletal disorder development remains high. This may be due to the additional muscle activity necessary for the maintenance of postural equilibrium during work tasks. This research proposes that postural control and subsequent additional muscle activity is influenced by the magnitude of the external load and the degree of body movement. The objective of this research was to identify whether performing tasks with increased external load and with a greater degree of trunk motion places additional strain on the musculoskeletal system in excess of that imposed by task demands. Twenty-four male and twenty-four female subjects performed four load manipulation tasks under three loading conditions (0.8kg, 1.6kg, and 4kg). Each task comprised of a static and dynamic condition. For the static condition, subjects maintained a stipulated posture for ten seconds. The dynamic condition required subjects to move and replace a box once every three seconds, such that a complete lift and lower cycle was performed in six seconds. Throughout task completion, muscle activity of six pairs of trunk muscles were analysed using surface electromyography. This was accompanied by data regarding ground reaction forces obtained through the use of a force platform. After the completion of each condition subjects were required to identify and rate body discomfort. Differential analysis was used to isolate the muscle activity and ground reaction forces attributed to increased external load and increased trunk movement. It was found that the heaviest loading conditions (4kg) resulted in significantly greater (p<0.05) muscle activation in the majority of muscles during all tasks investigated. The trend of muscle activity attributed to load was similar in all significantly altered muscles and activation was greatest in the heaviest loading condition. A degree of movement efficiency occurred in some muscles when manipulating loads of 0.8kg and 1.6kg. At greater loads, this did not occur suggesting that heavier loading conditions result in additional strain on the body in excess of that imposed by task demands. In manipulated data, trend of vertical ground reaction forces increased with increased load in all tasks. Sagittal movement of the centre of pressure attributed to load was significantly affected in manipulated data in the second movement phase of the “hip shoulder” task and the second movement phase of the “hip twist” task. The “hip reach” task was most affected by increased load magnitude as muscle activity attributed to load was significantly different (p<0.05) under increased loading conditions in both movement phases in all muscles. Further, a significant interactional effect (p<0.05) between condition and data point was found in all muscles with the exception of the right and left lumbar erector spinae during the second movement phase of the “hip reach” task. Muscle activity associated with increased trunk motion resulted in additional strain on the trunk muscles in the “hip shoulder” and “hip reach” tasks as muscle activity associated with the static component of each of the above tasks was greater than that of the dynamic tasks. Trend of ground reaction forces attributed to increased trunk motion generally increased under increased loading conditions. Additionally, a significant interactional effect (p<0.05) between load and muscle activity pattern was found in all muscles during all tasks, with the exception of the right rectus abdominis in the first movement phase of the “hip shoulder’ task, the left rectus abdominis in the second movement phase of the “hip knee” task and the right latissimus dorsi during the first movement phase of the “hip twist” task. This was accompanied by a significant interactional effect (p<0.05) between load and sagittal centre of pressure movement attributed to load, in both movement phases of all tasks investigated. From this research it can be proposed that guidelines may underestimate risk and subsequently under predict the strain in tasks performed with greater external loads as well as tasks which require a greater degree of trunk motion. Therefore, this study illustrates the importance of the consideration of the muscle activity necessary to maintain postural equilibrium in overall load analyses.
- Full Text:
- Date Issued: 2010
- Authors: Pettengell, Clare Louise
- Date: 2010
- Subjects: Physical fitness , Exercise , Materials handling , Manual work , Lifting and carrying
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5125 , http://hdl.handle.net/10962/d1005203 , Physical fitness , Exercise , Materials handling , Manual work , Lifting and carrying
- Description: Although much effort has been placed into the reduction of risks associated with manual materials handling, risk of musculoskeletal disorder development remains high. This may be due to the additional muscle activity necessary for the maintenance of postural equilibrium during work tasks. This research proposes that postural control and subsequent additional muscle activity is influenced by the magnitude of the external load and the degree of body movement. The objective of this research was to identify whether performing tasks with increased external load and with a greater degree of trunk motion places additional strain on the musculoskeletal system in excess of that imposed by task demands. Twenty-four male and twenty-four female subjects performed four load manipulation tasks under three loading conditions (0.8kg, 1.6kg, and 4kg). Each task comprised of a static and dynamic condition. For the static condition, subjects maintained a stipulated posture for ten seconds. The dynamic condition required subjects to move and replace a box once every three seconds, such that a complete lift and lower cycle was performed in six seconds. Throughout task completion, muscle activity of six pairs of trunk muscles were analysed using surface electromyography. This was accompanied by data regarding ground reaction forces obtained through the use of a force platform. After the completion of each condition subjects were required to identify and rate body discomfort. Differential analysis was used to isolate the muscle activity and ground reaction forces attributed to increased external load and increased trunk movement. It was found that the heaviest loading conditions (4kg) resulted in significantly greater (p<0.05) muscle activation in the majority of muscles during all tasks investigated. The trend of muscle activity attributed to load was similar in all significantly altered muscles and activation was greatest in the heaviest loading condition. A degree of movement efficiency occurred in some muscles when manipulating loads of 0.8kg and 1.6kg. At greater loads, this did not occur suggesting that heavier loading conditions result in additional strain on the body in excess of that imposed by task demands. In manipulated data, trend of vertical ground reaction forces increased with increased load in all tasks. Sagittal movement of the centre of pressure attributed to load was significantly affected in manipulated data in the second movement phase of the “hip shoulder” task and the second movement phase of the “hip twist” task. The “hip reach” task was most affected by increased load magnitude as muscle activity attributed to load was significantly different (p<0.05) under increased loading conditions in both movement phases in all muscles. Further, a significant interactional effect (p<0.05) between condition and data point was found in all muscles with the exception of the right and left lumbar erector spinae during the second movement phase of the “hip reach” task. Muscle activity associated with increased trunk motion resulted in additional strain on the trunk muscles in the “hip shoulder” and “hip reach” tasks as muscle activity associated with the static component of each of the above tasks was greater than that of the dynamic tasks. Trend of ground reaction forces attributed to increased trunk motion generally increased under increased loading conditions. Additionally, a significant interactional effect (p<0.05) between load and muscle activity pattern was found in all muscles during all tasks, with the exception of the right rectus abdominis in the first movement phase of the “hip shoulder’ task, the left rectus abdominis in the second movement phase of the “hip knee” task and the right latissimus dorsi during the first movement phase of the “hip twist” task. This was accompanied by a significant interactional effect (p<0.05) between load and sagittal centre of pressure movement attributed to load, in both movement phases of all tasks investigated. From this research it can be proposed that guidelines may underestimate risk and subsequently under predict the strain in tasks performed with greater external loads as well as tasks which require a greater degree of trunk motion. Therefore, this study illustrates the importance of the consideration of the muscle activity necessary to maintain postural equilibrium in overall load analyses.
- Full Text:
- Date Issued: 2010