Main thesis title 2021: subtitle if needed. If no subtitle follow instructions in manual
- Authors: Mashinini, Peter Madindwa
- Date: 2015-03
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53340 , vital:45138
- Description: Ti6Al4V alloy usage is increasing due to high demand from the aerospace and automotive industries as well as the field of medical implants. Therefore, identifying the most effective joining technique is critically important to ensure that optimum life can be achieved by welded components. This is especially important for the aerospace industry where fatigue life of the welded joints is vital. This research identified two relatively new joining technologies for Titanium sheet, namely, Friction Stir Welding (FSW),a solid-state process, and Laser Beam Welding (LBW),a fusion joining process. It was therefore vitalto conduct a systematic study of these two processes and compare results to illustrate which process attributes to static and dynamic properties. This investigation was accomplished by varying the process heat input for both FSW and LBW. The main parameters used to control process heat input were rotational-and traverse speed for FSW and laser power and traverse speed for LBW. In FSW, a reaction torque was used to describe the process energy in order to achieve the plasticised material condition. Preliminary work was done to establish the influencing factors for a successful weld which included tool optimisation but process optimisation was not discussed in elaborative detail. In LBW, traverse speed was identified as the critical control parameter to ensure good weld penetration. Weld width was recorded as it showed strong correlation to heat input rates. , Thesis (MA) -- Faculty of Engineering, the Built Environment and Technology, Mechanical Engineering, 2021
- Full Text:
- Date Issued: 2015-03
- Authors: Mashinini, Peter Madindwa
- Date: 2015-03
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53340 , vital:45138
- Description: Ti6Al4V alloy usage is increasing due to high demand from the aerospace and automotive industries as well as the field of medical implants. Therefore, identifying the most effective joining technique is critically important to ensure that optimum life can be achieved by welded components. This is especially important for the aerospace industry where fatigue life of the welded joints is vital. This research identified two relatively new joining technologies for Titanium sheet, namely, Friction Stir Welding (FSW),a solid-state process, and Laser Beam Welding (LBW),a fusion joining process. It was therefore vitalto conduct a systematic study of these two processes and compare results to illustrate which process attributes to static and dynamic properties. This investigation was accomplished by varying the process heat input for both FSW and LBW. The main parameters used to control process heat input were rotational-and traverse speed for FSW and laser power and traverse speed for LBW. In FSW, a reaction torque was used to describe the process energy in order to achieve the plasticised material condition. Preliminary work was done to establish the influencing factors for a successful weld which included tool optimisation but process optimisation was not discussed in elaborative detail. In LBW, traverse speed was identified as the critical control parameter to ensure good weld penetration. Weld width was recorded as it showed strong correlation to heat input rates. , Thesis (MA) -- Faculty of Engineering, the Built Environment and Technology, Mechanical Engineering, 2021
- Full Text:
- Date Issued: 2015-03
Perceptions regarding corporate citizenship behaviour in Zimbabwe
- Authors: Muzvidziwa, Itai
- Date: 2015-03
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53396 , vital:45144
- Description: Corporate Citizenship (CC) has risen as a conspicuous term in the literature dealing with the social role of business. Citizenship‟s focal point is the rights and responsibilities of all members of the community. CC can be defined as the extent to which organisations undertake the compulsory economic, legal, ethical, and discretionary responsibilities imposed on them by their stakeholders. CC recognises organisations as legal persons with certain rights and responsibilities as members of a community. The upsurge in undertaking acts of social responsibility illustrates that CC tends to be a strategic measurement that investors use to consciously align ethical concerns with publicly held organisations. In Zimbabwe, some organisations have made some progress towards CC - yet a long journey lies ahead in promoting CC by both the private sector and the Government of Zimbabwe. Against this background, the following research question was addressed in this study: What are the perceptions regarding CC behaviour in Zimbabwe? This study has been motivated by the knowledge gap on CC as a dynamic and contextual response to internal and external environmental pressures and the shift in community expectations concerning the roles, responsibilities and accountabilities of businesses in Zimbabwe. The main objective of this study was to investigate perceptions regarding corporate citizenship behaviour in Zimbabwe. A hypothetical model shows various factors that may influence perceptions regarding CC behaviour in Zimbabwe. Three independent variables (internal factors, external factors and personal factors) were identified as variables that may influence perceptions regarding CC behaviour. The mediating variable (perceptions regarding CC behaviour) was also identified as a variable that have potential to affect the dependent variables (organisational performance, competitiveness, image and sustainability). Furthermore, seven null-hypotheses were developed to test the relationship between the independent, mediating and dependent variables. All these variables were clearly defined and operationalised with various items obtained from measuring instruments used in other similar studies. , Thesis (PhD) -- Faculty of Business and Economic Sciences, School of Management Sciences, 2021
- Full Text:
- Date Issued: 2015-03
- Authors: Muzvidziwa, Itai
- Date: 2015-03
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/53396 , vital:45144
- Description: Corporate Citizenship (CC) has risen as a conspicuous term in the literature dealing with the social role of business. Citizenship‟s focal point is the rights and responsibilities of all members of the community. CC can be defined as the extent to which organisations undertake the compulsory economic, legal, ethical, and discretionary responsibilities imposed on them by their stakeholders. CC recognises organisations as legal persons with certain rights and responsibilities as members of a community. The upsurge in undertaking acts of social responsibility illustrates that CC tends to be a strategic measurement that investors use to consciously align ethical concerns with publicly held organisations. In Zimbabwe, some organisations have made some progress towards CC - yet a long journey lies ahead in promoting CC by both the private sector and the Government of Zimbabwe. Against this background, the following research question was addressed in this study: What are the perceptions regarding CC behaviour in Zimbabwe? This study has been motivated by the knowledge gap on CC as a dynamic and contextual response to internal and external environmental pressures and the shift in community expectations concerning the roles, responsibilities and accountabilities of businesses in Zimbabwe. The main objective of this study was to investigate perceptions regarding corporate citizenship behaviour in Zimbabwe. A hypothetical model shows various factors that may influence perceptions regarding CC behaviour in Zimbabwe. Three independent variables (internal factors, external factors and personal factors) were identified as variables that may influence perceptions regarding CC behaviour. The mediating variable (perceptions regarding CC behaviour) was also identified as a variable that have potential to affect the dependent variables (organisational performance, competitiveness, image and sustainability). Furthermore, seven null-hypotheses were developed to test the relationship between the independent, mediating and dependent variables. All these variables were clearly defined and operationalised with various items obtained from measuring instruments used in other similar studies. , Thesis (PhD) -- Faculty of Business and Economic Sciences, School of Management Sciences, 2021
- Full Text:
- Date Issued: 2015-03
Performance-based strategies for improving service quality in electricity regulation in developing countries: the Nigerian experience
- Authors: Obi, Chikwerem Ukaobasi
- Date: 2015-03
- Subjects: Electricity--Government policy--Developing countries , Public administration
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10353/24868 , vital:63665
- Description: Service quality is a relatively new concept in the regulatory lexicon. It has emerged as a critical factor in post-reform regulation of electricity distribution networks and it is a multi-dimensional concept in regulatory policy that connotes standard of performance in service delivery. Regulators establish performance standards by defining clearly the quality of service the customer deserves given the price paid. It is in recognition of the fact that customers are highly sensitive to the level of service delivered to them, and they value the speed and accuracy with which their requests are handled that have made service quality critical in the electricity value chain. The level of quality provided to individual customers is generally distributed over a range of values. Hence, regulators are mainly concerned with the protection of the worst-served customers and the possibility that a group of customers might receive unacceptably low levels of service quality. The major objective of this study is to ascertain how service quality regulation can improve electricity distribution in Nigeria. In doing this, the research gave a general overview of the study as an introduction in chapter one; it went on to review the available literature in chapter two. Chapter three conceptualizes the framework of the study by identifying the New Public Management (NPM) as a catalyst for effective regulation, followed by a case study of the Nigerian Electricity Regulatory Commission in chapter four. In chapter five, the study employed the Likert attitudinal scale sampling technique and the Data Envelopment Analysis (DEA) as the methodologies for data analysis in the research. The data presentation and interpretation were carried out in chapter six by presenting the results of the customer survey and outlining the key performance indicators (KPIs) based on the following three areas of service quality: technical indicators, financial indicators and customer-service indicators, which finally dovetailed into the summary, recommendations and conclusion in chapter seven. The performance of the privatized DISCOs was assessed by means of descriptive analysis by administering questionnaires, trend analysis and technical efficiency estimations using the Data Envelopment Analysis (DEA) techniques. The estimates were carried out by means of the Frontier 4.1 software and were based on three assumptions of returns to scale. The findings revealed that the average industry performance for DISCOs dropped from 95% before privatization to 82% after privatization. This relatively poor performance may well have been caused by the reluctance of the private investors, who now own majority shares in the DISCOs, to invest in the retrofitting and upgrading of the network infrastructure existing before they took over. The implication of this finding is not a condemnation of the recentlyconcluded privatization of the power sector in Nigeria, but probably the private investors’ desperation to recover their investment at the expense of public interest for quality service given that most of the investors acquired the utilities with shortterm funds. , Thesis (PhD) -- Faculty of Management and Commerce, 2015
- Full Text:
- Date Issued: 2015-03
- Authors: Obi, Chikwerem Ukaobasi
- Date: 2015-03
- Subjects: Electricity--Government policy--Developing countries , Public administration
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10353/24868 , vital:63665
- Description: Service quality is a relatively new concept in the regulatory lexicon. It has emerged as a critical factor in post-reform regulation of electricity distribution networks and it is a multi-dimensional concept in regulatory policy that connotes standard of performance in service delivery. Regulators establish performance standards by defining clearly the quality of service the customer deserves given the price paid. It is in recognition of the fact that customers are highly sensitive to the level of service delivered to them, and they value the speed and accuracy with which their requests are handled that have made service quality critical in the electricity value chain. The level of quality provided to individual customers is generally distributed over a range of values. Hence, regulators are mainly concerned with the protection of the worst-served customers and the possibility that a group of customers might receive unacceptably low levels of service quality. The major objective of this study is to ascertain how service quality regulation can improve electricity distribution in Nigeria. In doing this, the research gave a general overview of the study as an introduction in chapter one; it went on to review the available literature in chapter two. Chapter three conceptualizes the framework of the study by identifying the New Public Management (NPM) as a catalyst for effective regulation, followed by a case study of the Nigerian Electricity Regulatory Commission in chapter four. In chapter five, the study employed the Likert attitudinal scale sampling technique and the Data Envelopment Analysis (DEA) as the methodologies for data analysis in the research. The data presentation and interpretation were carried out in chapter six by presenting the results of the customer survey and outlining the key performance indicators (KPIs) based on the following three areas of service quality: technical indicators, financial indicators and customer-service indicators, which finally dovetailed into the summary, recommendations and conclusion in chapter seven. The performance of the privatized DISCOs was assessed by means of descriptive analysis by administering questionnaires, trend analysis and technical efficiency estimations using the Data Envelopment Analysis (DEA) techniques. The estimates were carried out by means of the Frontier 4.1 software and were based on three assumptions of returns to scale. The findings revealed that the average industry performance for DISCOs dropped from 95% before privatization to 82% after privatization. This relatively poor performance may well have been caused by the reluctance of the private investors, who now own majority shares in the DISCOs, to invest in the retrofitting and upgrading of the network infrastructure existing before they took over. The implication of this finding is not a condemnation of the recentlyconcluded privatization of the power sector in Nigeria, but probably the private investors’ desperation to recover their investment at the expense of public interest for quality service given that most of the investors acquired the utilities with shortterm funds. , Thesis (PhD) -- Faculty of Management and Commerce, 2015
- Full Text:
- Date Issued: 2015-03
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