A sandbox-based approach to the deobfuscation and dissection of php-based malware
- Wrench, Peter M, Irwin, Barry V W
- Authors: Wrench, Peter M , Irwin, Barry V W
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429258 , vital:72571 , 10.23919/SAIEE.2015.8531886
- Description: The creation and proliferation of PHP-based Remote Access Trojans (or web shells) used in both the compromise and post exploitation of web platforms has fuelled research into automated methods of dissecting and analysing these shells. Current malware tools disguise themselves by making use of obfuscation techniques designed to frustrate any efforts to dissect or reverse engineer the code. Advanced code engineering can even cause malware to behave differently if it detects that it is not running on the system for which it was originally targeted. To combat these defensive techniques, this paper presents a sandbox-based environment that aims to accurately mimic a vulnerable host and is capable of semi-automatic semantic dissection and syntactic deobfuscation of PHP code.
- Full Text:
- Date Issued: 2015
- Authors: Wrench, Peter M , Irwin, Barry V W
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429258 , vital:72571 , 10.23919/SAIEE.2015.8531886
- Description: The creation and proliferation of PHP-based Remote Access Trojans (or web shells) used in both the compromise and post exploitation of web platforms has fuelled research into automated methods of dissecting and analysing these shells. Current malware tools disguise themselves by making use of obfuscation techniques designed to frustrate any efforts to dissect or reverse engineer the code. Advanced code engineering can even cause malware to behave differently if it detects that it is not running on the system for which it was originally targeted. To combat these defensive techniques, this paper presents a sandbox-based environment that aims to accurately mimic a vulnerable host and is capable of semi-automatic semantic dissection and syntactic deobfuscation of PHP code.
- Full Text:
- Date Issued: 2015
Towards a PHP webshell taxonomy using deobfuscation-assisted similarity analysis
- Wrench, Peter M, Irwin, Barry V W
- Authors: Wrench, Peter M , Irwin, Barry V W
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429560 , vital:72622 , 10.1109/ISSA.2015.7335066
- Description: The abundance of PHP-based Remote Access Trojans (or web shells) found in the wild has led malware researchers to develop systems capable of tracking and analysing these shells. In the past, such shells were ably classified using signature matching, a process that is currently unable to cope with the sheer volume and variety of web-based malware in circulation. Although a large percentage of newly-created webshell software incorporates portions of code derived from seminal shells such as c99 and r57, they are able to disguise this by making extensive use of obfuscation techniques intended to frustrate any attempts to dissect or reverse engineer the code. This paper presents an approach to shell classification and analysis (based on similarity to a body of known malware) in an attempt to create a comprehensive taxonomy of PHP-based web shells. Several different measures of similarity were used in conjunction with clustering algorithms and visualisation techniques in order to achieve this. Furthermore, an auxiliary component capable of syntactically deobfuscating PHP code is described. This was employed to reverse idiomatic obfuscation constructs used by software authors. It was found that this deobfuscation dramatically increased the observed levels of similarity by exposing additional code for analysis.
- Full Text:
- Date Issued: 2015
- Authors: Wrench, Peter M , Irwin, Barry V W
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429560 , vital:72622 , 10.1109/ISSA.2015.7335066
- Description: The abundance of PHP-based Remote Access Trojans (or web shells) found in the wild has led malware researchers to develop systems capable of tracking and analysing these shells. In the past, such shells were ably classified using signature matching, a process that is currently unable to cope with the sheer volume and variety of web-based malware in circulation. Although a large percentage of newly-created webshell software incorporates portions of code derived from seminal shells such as c99 and r57, they are able to disguise this by making extensive use of obfuscation techniques intended to frustrate any attempts to dissect or reverse engineer the code. This paper presents an approach to shell classification and analysis (based on similarity to a body of known malware) in an attempt to create a comprehensive taxonomy of PHP-based web shells. Several different measures of similarity were used in conjunction with clustering algorithms and visualisation techniques in order to achieve this. Furthermore, an auxiliary component capable of syntactically deobfuscating PHP code is described. This was employed to reverse idiomatic obfuscation constructs used by software authors. It was found that this deobfuscation dramatically increased the observed levels of similarity by exposing additional code for analysis.
- Full Text:
- Date Issued: 2015
The effects of dietary soya and crystalline phytoestrogens on the growth, gonad development and histology of farmed abalone, Haliotis midae
- Wu, Yu
- Authors: Wu, Yu
- Date: 2015
- Subjects: Haliotis midae , Haliotis midae -- Feeding and feeds , Haliotis midae -- Growth , Haliotis midae -- Histology , Haliotis midae -- Effect of chemicals on , Soybean as feed , Phytoestrogens
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5380 , http://hdl.handle.net/10962/d1017225
- Description: The inclusion of soya as a dietary protein source in the formulated feed, Abfeed® S34 (Marifeed Pty (Ltd), Hermanus) for farmed abalone, Haliotis midae has resulted in larger gonads during reproductive seasons compared to the gonads of abalone fed kelp or diets that included fishmeal as the only main protein source. The aim of this study was to determine if the isoflavones present in the soya were responsible for this increase in gonad size and the subsequent effects on farmed abalone growth. Animals weighing between 40-50 g were fed one of seven isonitrogenous and isoenergetic diets containing either 0, 25, 50 or 100 percent of the soya component of the commercial feed (Abfeed® S34, Marifeed Pty (Ltd), Hermanus) from September 2013 to March 2014. An additional three diets were formulated to include crystalline isoflavone (ISO). These diets were identical to the 0 percent soya diet (i.e. the fishmeal only diet - FM), only ISO was included at the same rate that ISO occurred in the three soya diets. Data were analysed using a multiple forward stepwise regression analysis (MSR) to test the effects of ISO concentration, soya concentration, time, sex, time by concentration interaction and sex by concentration interaction on growth and gonad development and to identify those variables that most contributed to the model. The inclusion of crystalline ISO failed to promote larger gonads and had no effect on abalone growth, while growth and gonad development was dose dependent on soya inclusion rates with sex and time contributing to the models. Mean monthly weight gain in males correlated with increasing soya concentrations (c) (MSR, y = 3.24 + 0.002c, r2 = 0.23, p = 0.03), ranging from 3.11 ± 0.55 g abalone-1 month-1 to 4.43 ± 0.46 g abalone-1 month-1, while both male and female monthly length gain was not influenced by soya concentration with an overall mean of 1.62 ± 0.05 mm abalone-1 month-1 (MSR, p = 0.05 and p = 0.81, respectively). By December, the whole body mass, meat mass and visceral mass in both males and females decreased with increasing soya levels. However, by February, female whole body mass, meat mass and visceral mass positively correlated with soya levels. At the end of the study, male abalone fed FM with soya equivalent to the commercial feed had the highest whole body mass (69.00 ± 2.48 g abalone-1), meat mass (41.80 ± 1.12 g abalone-1), visceral mass (9.00 ± 2.47 g abalone-1) and gonad bulk index (42.70 ± 9.82 g abalone-1), while females were not influenced by soya concentrations with an overall whole body mass of 63.46 ± 0.79 g abalone-1. Weight loss was observed in all treatments between February and March, probably due to a spawning event. The moisture content in the meat was not influenced by treatment, however, visceral water loss was effected by both ISO and soya concentration with time and sex contributing to the model. The visceral water loss of females fed graded levels of soya decreased as a function of soya from December to March, and from December to February for males, whereas females fed ISO-enriched diets decreased as a function of ISO concentration (c) at the end of the study from 74.98 ± 0.88 to 73.10 ± 0.75 percent (MSR, y = 74.97 – 0.0025c, r2 = 0.20, p = 0.048). The inclusion of crystalline ISO had no significant effect on oogenesis in female farmed Haliotis midae, while the distribution of the predominant oocyte stage, stage 7 (second last stage prior to spawning) was dose-dependent in abalone fed increasing soya concentration (c) (MSR, y = 33.38 + 0.03c, r2 = 0.32, F(1, 18) = 8.52, p = 0.01). The increase in stage 7 oocytes in abalone fed FM with soya did not reduce the number of oocytes (44.96 ± 3.01 oocytes mm-2) present within the lumen, while the number of oocytes (o) in abalone fed the FM-only based diets decreased with increasing abundance of stage 7 oocytes (MSR, y = 58.28 – 0.48c, r2 = 0.38, F(1, 18) = 12.51, p = 0.002), possibly due to the increase in size of the oocytes with thicker jelly coats. This study provided evidence that crystalline isoflavone had no influence on abalone gonad development over five months, while soya had a dose-dependent effect on growth, gonad mass and oogenesis in farmed Haliotis midae. Formulated abalone feed could be manipulated at certain times of the year to obtain maximum growth. These implications and further studies were discussed.
- Full Text:
- Date Issued: 2015
- Authors: Wu, Yu
- Date: 2015
- Subjects: Haliotis midae , Haliotis midae -- Feeding and feeds , Haliotis midae -- Growth , Haliotis midae -- Histology , Haliotis midae -- Effect of chemicals on , Soybean as feed , Phytoestrogens
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5380 , http://hdl.handle.net/10962/d1017225
- Description: The inclusion of soya as a dietary protein source in the formulated feed, Abfeed® S34 (Marifeed Pty (Ltd), Hermanus) for farmed abalone, Haliotis midae has resulted in larger gonads during reproductive seasons compared to the gonads of abalone fed kelp or diets that included fishmeal as the only main protein source. The aim of this study was to determine if the isoflavones present in the soya were responsible for this increase in gonad size and the subsequent effects on farmed abalone growth. Animals weighing between 40-50 g were fed one of seven isonitrogenous and isoenergetic diets containing either 0, 25, 50 or 100 percent of the soya component of the commercial feed (Abfeed® S34, Marifeed Pty (Ltd), Hermanus) from September 2013 to March 2014. An additional three diets were formulated to include crystalline isoflavone (ISO). These diets were identical to the 0 percent soya diet (i.e. the fishmeal only diet - FM), only ISO was included at the same rate that ISO occurred in the three soya diets. Data were analysed using a multiple forward stepwise regression analysis (MSR) to test the effects of ISO concentration, soya concentration, time, sex, time by concentration interaction and sex by concentration interaction on growth and gonad development and to identify those variables that most contributed to the model. The inclusion of crystalline ISO failed to promote larger gonads and had no effect on abalone growth, while growth and gonad development was dose dependent on soya inclusion rates with sex and time contributing to the models. Mean monthly weight gain in males correlated with increasing soya concentrations (c) (MSR, y = 3.24 + 0.002c, r2 = 0.23, p = 0.03), ranging from 3.11 ± 0.55 g abalone-1 month-1 to 4.43 ± 0.46 g abalone-1 month-1, while both male and female monthly length gain was not influenced by soya concentration with an overall mean of 1.62 ± 0.05 mm abalone-1 month-1 (MSR, p = 0.05 and p = 0.81, respectively). By December, the whole body mass, meat mass and visceral mass in both males and females decreased with increasing soya levels. However, by February, female whole body mass, meat mass and visceral mass positively correlated with soya levels. At the end of the study, male abalone fed FM with soya equivalent to the commercial feed had the highest whole body mass (69.00 ± 2.48 g abalone-1), meat mass (41.80 ± 1.12 g abalone-1), visceral mass (9.00 ± 2.47 g abalone-1) and gonad bulk index (42.70 ± 9.82 g abalone-1), while females were not influenced by soya concentrations with an overall whole body mass of 63.46 ± 0.79 g abalone-1. Weight loss was observed in all treatments between February and March, probably due to a spawning event. The moisture content in the meat was not influenced by treatment, however, visceral water loss was effected by both ISO and soya concentration with time and sex contributing to the model. The visceral water loss of females fed graded levels of soya decreased as a function of soya from December to March, and from December to February for males, whereas females fed ISO-enriched diets decreased as a function of ISO concentration (c) at the end of the study from 74.98 ± 0.88 to 73.10 ± 0.75 percent (MSR, y = 74.97 – 0.0025c, r2 = 0.20, p = 0.048). The inclusion of crystalline ISO had no significant effect on oogenesis in female farmed Haliotis midae, while the distribution of the predominant oocyte stage, stage 7 (second last stage prior to spawning) was dose-dependent in abalone fed increasing soya concentration (c) (MSR, y = 33.38 + 0.03c, r2 = 0.32, F(1, 18) = 8.52, p = 0.01). The increase in stage 7 oocytes in abalone fed FM with soya did not reduce the number of oocytes (44.96 ± 3.01 oocytes mm-2) present within the lumen, while the number of oocytes (o) in abalone fed the FM-only based diets decreased with increasing abundance of stage 7 oocytes (MSR, y = 58.28 – 0.48c, r2 = 0.38, F(1, 18) = 12.51, p = 0.002), possibly due to the increase in size of the oocytes with thicker jelly coats. This study provided evidence that crystalline isoflavone had no influence on abalone gonad development over five months, while soya had a dose-dependent effect on growth, gonad mass and oogenesis in farmed Haliotis midae. Formulated abalone feed could be manipulated at certain times of the year to obtain maximum growth. These implications and further studies were discussed.
- Full Text:
- Date Issued: 2015
The developmental impact of non-contributory social grants in South Africa : a study of Ezibeleni, Queenstown
- Authors: Xaba, Mzingaye Brilliant
- Date: 2015
- Subjects: Economic assistance, Domestic -- South Africa , Poor -- South Africa -- Queenstown , Poverty -- South Africa -- Queenstown , South Africa -- Economic conditions -- 1991- , South Africa -- Social conditions -- 1994-
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3402 , http://hdl.handle.net/10962/d1018919
- Description: Amartya Sen argued that poverty was the “deprivation” of the capability to lead a “good life”, therefore ending poverty meant meeting basic physical and social needs, and enabling meaningful economic and political choices. The principal objective of this research was to investigate whether (and if so, in what ways) post-apartheid state-provided non-contributory cash social grants in South Africa reduced “poverty” in Sen’s sense. This thesis used Ezibeleni, a historically black working class township at Queenstown, in the Eastern Cape, as a reference area. Using in-depth interviews, it found that social grants did help reduce poverty, both in terms of helping meet basic needs and enabling grant recipients to make more choices, including facilitating job searches and small businesses. However, it was also found that grants fall short of ending poverty, as the grants were too small to adequately cover basic needs in the context of large family sizes, a serious and long-term lack of resources, persistent unemployment, and high indebtedness, and could also enable only a limited expansion of choices. The grants played a positive role, but were inadequate to remove the “unfreedoms” facing the poor.
- Full Text:
- Date Issued: 2015
- Authors: Xaba, Mzingaye Brilliant
- Date: 2015
- Subjects: Economic assistance, Domestic -- South Africa , Poor -- South Africa -- Queenstown , Poverty -- South Africa -- Queenstown , South Africa -- Economic conditions -- 1991- , South Africa -- Social conditions -- 1994-
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3402 , http://hdl.handle.net/10962/d1018919
- Description: Amartya Sen argued that poverty was the “deprivation” of the capability to lead a “good life”, therefore ending poverty meant meeting basic physical and social needs, and enabling meaningful economic and political choices. The principal objective of this research was to investigate whether (and if so, in what ways) post-apartheid state-provided non-contributory cash social grants in South Africa reduced “poverty” in Sen’s sense. This thesis used Ezibeleni, a historically black working class township at Queenstown, in the Eastern Cape, as a reference area. Using in-depth interviews, it found that social grants did help reduce poverty, both in terms of helping meet basic needs and enabling grant recipients to make more choices, including facilitating job searches and small businesses. However, it was also found that grants fall short of ending poverty, as the grants were too small to adequately cover basic needs in the context of large family sizes, a serious and long-term lack of resources, persistent unemployment, and high indebtedness, and could also enable only a limited expansion of choices. The grants played a positive role, but were inadequate to remove the “unfreedoms” facing the poor.
- Full Text:
- Date Issued: 2015
Automated statistical audit system for a government regulatory authority
- Authors: Xozwa, Thandolwethu
- Date: 2015
- Subjects: Auditing -- Statistical methods -- Data processing , Mathematica (Computer program language)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/6061 , vital:21035
- Description: Governments all over the world are faced with numerous challenges while running their countries on a daily basis. The predominant challenges which arise are those which involve statistical methodologies. Official statistics to South Africa’s infrastructure are very important and because of this it is important that an effort is made to reduce the challenges that occur during the development of official statistics. For official statistics to be developed successfully quality standards need to be built into an organisational framework and form a system of architecture (Statistics New Zealand 2009:1). Therefore, this study seeks to develop a statistical methodology that is appropriate and scientifically correct using an automated statistical system for audits in government regulatory authorities. The study makes use of Mathematica to provide guidelines on how to develop and use an automated statistical audit system. A comprehensive literature study was conducted using existing secondary sources. A quantitative research paradigm was adopted for this study, to empirically assess the demographic characteristics of tenants of Social Housing Estates and their perceptions towards the rental units they inhabit. More specifically a descriptive study was undertaken. Furthermore, a sample size was selected by means of convenience sampling for a case study on SHRA to assess the respondent’s biographical information. From this sample, a pilot study was conducted investigating the general perceptions of the respondents regarding the physical conditions and quality of their units. The technical development of an automated statistical audit system was discussed. This process involved the development and use of a questionnaire design tool, statistical analysis and reporting and how Mathematica software served as a platform for developing the system. The findings of this study provide insights on how government regulatory authorities can best utilise automated statistical audits for regulation purposes and achieved this by developing an automated statistical audit system for government regulatory authorities. It is hoped that the findings of this study will provide government regulatory authorities with practical suggestions or solutions regarding the generating of official statistics for regulatory purposes, and that the suggestions for future research will inspire future researchers to further investigate automated statistical audit systems, statistical analysis, automated questionnaire development, and government regulatory authorities individually.
- Full Text:
- Date Issued: 2015
- Authors: Xozwa, Thandolwethu
- Date: 2015
- Subjects: Auditing -- Statistical methods -- Data processing , Mathematica (Computer program language)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/6061 , vital:21035
- Description: Governments all over the world are faced with numerous challenges while running their countries on a daily basis. The predominant challenges which arise are those which involve statistical methodologies. Official statistics to South Africa’s infrastructure are very important and because of this it is important that an effort is made to reduce the challenges that occur during the development of official statistics. For official statistics to be developed successfully quality standards need to be built into an organisational framework and form a system of architecture (Statistics New Zealand 2009:1). Therefore, this study seeks to develop a statistical methodology that is appropriate and scientifically correct using an automated statistical system for audits in government regulatory authorities. The study makes use of Mathematica to provide guidelines on how to develop and use an automated statistical audit system. A comprehensive literature study was conducted using existing secondary sources. A quantitative research paradigm was adopted for this study, to empirically assess the demographic characteristics of tenants of Social Housing Estates and their perceptions towards the rental units they inhabit. More specifically a descriptive study was undertaken. Furthermore, a sample size was selected by means of convenience sampling for a case study on SHRA to assess the respondent’s biographical information. From this sample, a pilot study was conducted investigating the general perceptions of the respondents regarding the physical conditions and quality of their units. The technical development of an automated statistical audit system was discussed. This process involved the development and use of a questionnaire design tool, statistical analysis and reporting and how Mathematica software served as a platform for developing the system. The findings of this study provide insights on how government regulatory authorities can best utilise automated statistical audits for regulation purposes and achieved this by developing an automated statistical audit system for government regulatory authorities. It is hoped that the findings of this study will provide government regulatory authorities with practical suggestions or solutions regarding the generating of official statistics for regulatory purposes, and that the suggestions for future research will inspire future researchers to further investigate automated statistical audit systems, statistical analysis, automated questionnaire development, and government regulatory authorities individually.
- Full Text:
- Date Issued: 2015
An assessment of the municipal infrastructure and systems and their implications on the small town revitalisation strategy at Engcobo Local Municipality, Eastern Cape
- Authors: Xuba, Zibele
- Date: 2015
- Subjects: Infrastructure (Economics) -- South Africa -- Eastern Cape Municipal government -- South Africa -- Eastern Cape Municipal finance -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10353/2888 , vital:28121
- Description: This study was conducted at Engcobo Local Municipality in the Eastern Cape Province to assess the role of municipal structures and systems in the implementation of small town revitalisation strategy. From onset, it highlights that numerous attempts to implement small town revitalisation have failed because of lack of institutional capacity. In addressing this problem, the study outlined the following objectives. To assess role played by municipal structures and systems on implementation of small town revitalisation. To identify institutional challenges experienced during implementation of small town revitalisation strategy. To propose alternative institutional measures that can lead to effective implementation of small town revitalisation. In achieving the study’s objectives; literature from both developed and developing countries was reviewed and it was learnt that institutional capacity is important for efficient implementation of the strategy. Systems theory was also reviewed so as to provide conceptual basis that underpins this study. Data was collected through primary methods and secondary sources. Research participants were chosen by random sampling from councillors, managers, business and traditional leaders. Research findings revealed that there were institutional problems which hinder implementation of the strategy such as lack of competent human resources, insufficient budget and shortages of machinery. Through analysis of findings, the research proposed that small town revitalisation strategy should be reformulated and role of municipal structures be clearly defined. Both councillors and officials should be capacitated. The study further recommended that local people and stakeholders should be involved in the conception and implementation of small town revitalisation strategy. Areas for further research were proposed at the end.
- Full Text:
- Date Issued: 2015
- Authors: Xuba, Zibele
- Date: 2015
- Subjects: Infrastructure (Economics) -- South Africa -- Eastern Cape Municipal government -- South Africa -- Eastern Cape Municipal finance -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10353/2888 , vital:28121
- Description: This study was conducted at Engcobo Local Municipality in the Eastern Cape Province to assess the role of municipal structures and systems in the implementation of small town revitalisation strategy. From onset, it highlights that numerous attempts to implement small town revitalisation have failed because of lack of institutional capacity. In addressing this problem, the study outlined the following objectives. To assess role played by municipal structures and systems on implementation of small town revitalisation. To identify institutional challenges experienced during implementation of small town revitalisation strategy. To propose alternative institutional measures that can lead to effective implementation of small town revitalisation. In achieving the study’s objectives; literature from both developed and developing countries was reviewed and it was learnt that institutional capacity is important for efficient implementation of the strategy. Systems theory was also reviewed so as to provide conceptual basis that underpins this study. Data was collected through primary methods and secondary sources. Research participants were chosen by random sampling from councillors, managers, business and traditional leaders. Research findings revealed that there were institutional problems which hinder implementation of the strategy such as lack of competent human resources, insufficient budget and shortages of machinery. Through analysis of findings, the research proposed that small town revitalisation strategy should be reformulated and role of municipal structures be clearly defined. Both councillors and officials should be capacitated. The study further recommended that local people and stakeholders should be involved in the conception and implementation of small town revitalisation strategy. Areas for further research were proposed at the end.
- Full Text:
- Date Issued: 2015
Synthesis and characterization of Ru(II) phenyl-3-indenylidene olefin metathesis type complexes
- Authors: Yalezo, Ntsikelelo
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc (Chemistry)
- Identifier: vital:11351 , http://hdl.handle.net/10353/d1021128
- Description: In this study, a series of Ru(II) phenyl-3-indenylidene complexes with general formula of [RuCl2(NHC)(Ind)(L)] (where L= triphenylphosphine, pyridine and NHC = five different types of N-heterocyclic carbene ligands), have been synthesized and characterized using FT-IR, UV-Vis, elementally analysis and melting/decomposition point. The N,N’-diarylimidazolinium chlorides have been used as N-heterocyclic carbene precursors and were synthesized from their corresponding N,N’-diarylformamidines and further characterized using 1H-NMR, 13C-NMR, FTIR and melting point determination. The infrared spectra of the N,N’-diarylimidazolinium chlorides show a quaternary nature (R2N=C+) with broad vibration band in region 3300-3400 cm-1. The disappearance of this vibration band in the infrared spectra of the ruthenium(II) complexes was used to confirm the coordination of the ligand to the ruthenium ions. The percentage analysis of carbon, hydrogen and nitrogen obtained corresponded with the calculated percentages of these atoms in the complexes with the slight difference of less than 1%. The electronic spectra of the complexes show three distinct absorption bands. The two bands are due to intraligand charge transfers transition assigned to π→π*, n→π* and third band is due to d-d transition, signifying the presence of the metal ion. The synthesized Ru(II) complexes did not show any of melting, however a change in colour was observed signifying the decomposition of the complexes.
- Full Text:
- Date Issued: 2015
- Authors: Yalezo, Ntsikelelo
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc (Chemistry)
- Identifier: vital:11351 , http://hdl.handle.net/10353/d1021128
- Description: In this study, a series of Ru(II) phenyl-3-indenylidene complexes with general formula of [RuCl2(NHC)(Ind)(L)] (where L= triphenylphosphine, pyridine and NHC = five different types of N-heterocyclic carbene ligands), have been synthesized and characterized using FT-IR, UV-Vis, elementally analysis and melting/decomposition point. The N,N’-diarylimidazolinium chlorides have been used as N-heterocyclic carbene precursors and were synthesized from their corresponding N,N’-diarylformamidines and further characterized using 1H-NMR, 13C-NMR, FTIR and melting point determination. The infrared spectra of the N,N’-diarylimidazolinium chlorides show a quaternary nature (R2N=C+) with broad vibration band in region 3300-3400 cm-1. The disappearance of this vibration band in the infrared spectra of the ruthenium(II) complexes was used to confirm the coordination of the ligand to the ruthenium ions. The percentage analysis of carbon, hydrogen and nitrogen obtained corresponded with the calculated percentages of these atoms in the complexes with the slight difference of less than 1%. The electronic spectra of the complexes show three distinct absorption bands. The two bands are due to intraligand charge transfers transition assigned to π→π*, n→π* and third band is due to d-d transition, signifying the presence of the metal ion. The synthesized Ru(II) complexes did not show any of melting, however a change in colour was observed signifying the decomposition of the complexes.
- Full Text:
- Date Issued: 2015
The role of child support grants in poverty alleviation in rural communities
- Authors: Yapi, Kanyisa
- Date: 2015
- Subjects: Child welfare -- South Africa , Child support -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/7710 , vital:23396
- Description: This study seeks to investigate the challenges faced by the recipients of the child support grant, with special reference to Morgan Bay, a rural area under the aegis of the Amathole District Municipality in East London. The child support grant is a strategy that was introduced to alleviate poverty in previously disadvantaged communities. The child support grant replaced the state maintenance grant. South Africa has high levels of unemployment; and this situation is considered to be a major contributing factor to poverty. After the apartheid era, the African National Congress (ANC) led government introduced a litany of redistributive policy frameworks aimed at reversing the imbalances of the past created by the apartheid government. The child support grant, which was established during the year 1998, is viewed as one of the strategies introduced by the South African government aimed at alleviating poverty caused by the lack of jobs. The aim of the study is to assess the implementation of the child support grant impact as a developmental strategy in rural communities, such as Morgan Bay. The study seeks to determine how the child support grant redistribution has affected rural communities. In other words, the research seeks to determine whether the child support grant redistribution has affected rural communities positively or negatively, and to ascertain whether it has mitigated the impact of socio-economic challenges in rural communities. The study also seeks to explore other strategies, which could be implemented to supplement the child support grant, and possibly decrease the level of dependence on the child support grant – by having a back-up strategy for alleviating poverty.
- Full Text:
- Date Issued: 2015
- Authors: Yapi, Kanyisa
- Date: 2015
- Subjects: Child welfare -- South Africa , Child support -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/7710 , vital:23396
- Description: This study seeks to investigate the challenges faced by the recipients of the child support grant, with special reference to Morgan Bay, a rural area under the aegis of the Amathole District Municipality in East London. The child support grant is a strategy that was introduced to alleviate poverty in previously disadvantaged communities. The child support grant replaced the state maintenance grant. South Africa has high levels of unemployment; and this situation is considered to be a major contributing factor to poverty. After the apartheid era, the African National Congress (ANC) led government introduced a litany of redistributive policy frameworks aimed at reversing the imbalances of the past created by the apartheid government. The child support grant, which was established during the year 1998, is viewed as one of the strategies introduced by the South African government aimed at alleviating poverty caused by the lack of jobs. The aim of the study is to assess the implementation of the child support grant impact as a developmental strategy in rural communities, such as Morgan Bay. The study seeks to determine how the child support grant redistribution has affected rural communities. In other words, the research seeks to determine whether the child support grant redistribution has affected rural communities positively or negatively, and to ascertain whether it has mitigated the impact of socio-economic challenges in rural communities. The study also seeks to explore other strategies, which could be implemented to supplement the child support grant, and possibly decrease the level of dependence on the child support grant – by having a back-up strategy for alleviating poverty.
- Full Text:
- Date Issued: 2015
Enhancing public participation in the integrated development planning process: a case of Buffalo City Metropolitan Municipality
- Authors: Yekani, Babalo
- Date: 2015
- Subjects: Public administration -- Planning , Local government -- South Africa -- Eastern Cape -- Citizen participation , Municipal services -- South Africa -- Eastern Cape -- Citizen participation
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10948/8989 , vital:26453
- Description: The aim of the study is to investigate effective strategies and processes for public participation in the IDP process in the Buffalo City Metropolitan Municipality. A qualitative study was undertaken and literature review on public participation in terms of the Integrated Development Planning was conducted. Relevant secondary data was sourced and structured interviews were conducted with three (3) ward councillors in the Buffalo City Metropolitan Municipal. Focus group interviews were also conducted with ward committee members from three (3) wards in the Buffalo City Metropolitan Municipality. The findings of this research indicate that ward councilors have limited information on administrative processes. This could lead to ward councillors not be able to provide feedback on various service delivery issues and the progress of the municipal projects. Also ward councillors may not be able to influence public participation if they do not understand their role in administrative processes such as monitoring implementation of council decisions and policies. Ward councillors have no influence on the Integrated Development Planning especially the cost and budget estimates for municipal projects which are intended to benefit the members of the community. On the basis of the key findings, recommendations were made that ward committees should be empowered to deal with the complex developments in the Integrated Development Planning process and ward councillors should play a leading role in the Integrated Development Planning process.
- Full Text:
- Date Issued: 2015
- Authors: Yekani, Babalo
- Date: 2015
- Subjects: Public administration -- Planning , Local government -- South Africa -- Eastern Cape -- Citizen participation , Municipal services -- South Africa -- Eastern Cape -- Citizen participation
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10948/8989 , vital:26453
- Description: The aim of the study is to investigate effective strategies and processes for public participation in the IDP process in the Buffalo City Metropolitan Municipality. A qualitative study was undertaken and literature review on public participation in terms of the Integrated Development Planning was conducted. Relevant secondary data was sourced and structured interviews were conducted with three (3) ward councillors in the Buffalo City Metropolitan Municipal. Focus group interviews were also conducted with ward committee members from three (3) wards in the Buffalo City Metropolitan Municipality. The findings of this research indicate that ward councilors have limited information on administrative processes. This could lead to ward councillors not be able to provide feedback on various service delivery issues and the progress of the municipal projects. Also ward councillors may not be able to influence public participation if they do not understand their role in administrative processes such as monitoring implementation of council decisions and policies. Ward councillors have no influence on the Integrated Development Planning especially the cost and budget estimates for municipal projects which are intended to benefit the members of the community. On the basis of the key findings, recommendations were made that ward committees should be empowered to deal with the complex developments in the Integrated Development Planning process and ward councillors should play a leading role in the Integrated Development Planning process.
- Full Text:
- Date Issued: 2015
The health and injury risks faced by emergency medical workers in the Nelson Mandela Bay Municipality
- Authors: Yeki, Zandisile Rupert
- Date: 2015
- Subjects: Emergency medical personnel -- Safety measures , Industrial safety -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10948/4561 , vital:20617
- Description: This study investigated the health and injury risks faced by emergency medical workers in the Nelson Mandela Metropolitan Municipality. The aim of the study was to establish the emergency worker`s awareness, level of knowledge and attitude to practices of health and safety issues. The study sample consisted of eighty (80) emergency medical workers stationed in Port Elizabeth and Uitenhage. A self- administered questionnaire was developed and used in an empirical survey to collect data from the respondents on information such as health and safety knowledge, behavior, experiences, attitudes, beliefs and opinions in their workplace. The results of the study indicated that 90% of the workers experienced all occupational hazards identified in the questionnaire. Percutaneous injuries were found to be at 48%, PTSD was rated at 40% due to horrific accidents and incidents complicated by violent threats and armed robberies with emergency workers being victims. Musculoskeletal injuries were found to be very common. Ordinary stress was caused by dissatisfaction over human resources issues and structural changes by the management internally. The findings revealed that some workers took incapacity leave for long periods, sometimes more than three years at a time. The emergency workers are at high risk of being infected by ordinary TB or the more complex type, the DR-TB in their line of duty. The study revealed that there were no health and safety structures in the institution; as a result there was no formal documenting and identification of hazards in order to implement measures to protect the workers from future incidences. Health related absenteeism was high when employees were exposed to such hazards and replacement of skill was not implemented. The main recommendations included wearing of personal protective equipment, safe disposal of sharps objects, guidelines for lifting objects, introduction of organizational safety culture and safe transportation of PTB patients.
- Full Text:
- Date Issued: 2015
- Authors: Yeki, Zandisile Rupert
- Date: 2015
- Subjects: Emergency medical personnel -- Safety measures , Industrial safety -- South Africa -- Nelson Mandela Bay Municipality
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: http://hdl.handle.net/10948/4561 , vital:20617
- Description: This study investigated the health and injury risks faced by emergency medical workers in the Nelson Mandela Metropolitan Municipality. The aim of the study was to establish the emergency worker`s awareness, level of knowledge and attitude to practices of health and safety issues. The study sample consisted of eighty (80) emergency medical workers stationed in Port Elizabeth and Uitenhage. A self- administered questionnaire was developed and used in an empirical survey to collect data from the respondents on information such as health and safety knowledge, behavior, experiences, attitudes, beliefs and opinions in their workplace. The results of the study indicated that 90% of the workers experienced all occupational hazards identified in the questionnaire. Percutaneous injuries were found to be at 48%, PTSD was rated at 40% due to horrific accidents and incidents complicated by violent threats and armed robberies with emergency workers being victims. Musculoskeletal injuries were found to be very common. Ordinary stress was caused by dissatisfaction over human resources issues and structural changes by the management internally. The findings revealed that some workers took incapacity leave for long periods, sometimes more than three years at a time. The emergency workers are at high risk of being infected by ordinary TB or the more complex type, the DR-TB in their line of duty. The study revealed that there were no health and safety structures in the institution; as a result there was no formal documenting and identification of hazards in order to implement measures to protect the workers from future incidences. Health related absenteeism was high when employees were exposed to such hazards and replacement of skill was not implemented. The main recommendations included wearing of personal protective equipment, safe disposal of sharps objects, guidelines for lifting objects, introduction of organizational safety culture and safe transportation of PTB patients.
- Full Text:
- Date Issued: 2015
Exploring patterns of Facebook usage, social capital, loneliness and well-being among a diverse South African student sample:
- Young, Charles, Strelitz, Larry N
- Authors: Young, Charles , Strelitz, Larry N
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143705 , vital:38275 , https://ischp.files.wordpress.com/2015/08/ischp_2015_abstract_booklet.pdf
- Description: There has been much debate over whether the use of social network sites isolate people and truncate their relationships or alternatively, provide beneficial connections with others. This debate has been framed by a growing international literature which explores the triadic relationship between the intensity of use of Facebook to the maintenance of social capital and in turn the relationship between social capital and wellbeing and loneliness. A random list of 1168 Rhodes University students was drawn from the total student body and invited to participate in an online survey. In total, 491 students completed the survey (42% response rate). Hierarchical regression analyses demonstrate that intensity of Facebook usage adds a very small contribution to social capital, is very weakly associated with loneliness, and is not associated with wellbeing. Results contrast with international studies that fail to recognise the extent to which race and class cleavages impact on access to and use of social media.
- Full Text:
- Date Issued: 2015
- Authors: Young, Charles , Strelitz, Larry N
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143705 , vital:38275 , https://ischp.files.wordpress.com/2015/08/ischp_2015_abstract_booklet.pdf
- Description: There has been much debate over whether the use of social network sites isolate people and truncate their relationships or alternatively, provide beneficial connections with others. This debate has been framed by a growing international literature which explores the triadic relationship between the intensity of use of Facebook to the maintenance of social capital and in turn the relationship between social capital and wellbeing and loneliness. A random list of 1168 Rhodes University students was drawn from the total student body and invited to participate in an online survey. In total, 491 students completed the survey (42% response rate). Hierarchical regression analyses demonstrate that intensity of Facebook usage adds a very small contribution to social capital, is very weakly associated with loneliness, and is not associated with wellbeing. Results contrast with international studies that fail to recognise the extent to which race and class cleavages impact on access to and use of social media.
- Full Text:
- Date Issued: 2015
IsiXhosa storytelling (iintsomi) as an alternative medium for maternal health education in primary healthcare in the Eastern Cape
- Authors: Zakaza, Nompucuko
- Date: 2015
- Subjects: Communication in community health services -- South Africa -- Eastern Cape , Communication in reproductive health -- South Africa -- Eastern Cape , Storytelling in education , Applied folklore
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3648 , http://hdl.handle.net/10962/d1017188
- Description: The aim of this study is to explore the introduction of IsiXhosa (iintsomi) as an alternative method in the maternal health education in rural Primary Health Care in the Eastern Cape. An informal preliminary observation of a maternal health lesson by the researcher indicated a further need for maternal health educators to introduce storytelling into the health content themes. To re-inforce the maternal health educator lesson on the causes of teenage pregnancy, lifestyles for pregnant women, causes of miscarriage and termination of pregnancy, the Community Health Workers can undoubtedly use isiXhosa iintsomi in selected clinics and maternal waiting homes. As a readily available resource that cuts across all literacy barriers, iintsomi (isiXhosa) fosters a cross-cultural consultation which enables the healthcare worker to convey messages that make sense to the rural women. While the conventional methods of teaching have a tendency to create tension and lack of participation, use of folktale (iintsomi) have huge potential to bring lesson enjoyment; a meaningful interaction and story sharing by the maternal health educator, the pregnant women and greater community; access to important health messages; and strengthened utilisation of Primary Health Care. The study therefore suggests that there is a place for isiXhosa iintsomi: From the Fireplace into the Workplace.
- Full Text:
- Date Issued: 2015
- Authors: Zakaza, Nompucuko
- Date: 2015
- Subjects: Communication in community health services -- South Africa -- Eastern Cape , Communication in reproductive health -- South Africa -- Eastern Cape , Storytelling in education , Applied folklore
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3648 , http://hdl.handle.net/10962/d1017188
- Description: The aim of this study is to explore the introduction of IsiXhosa (iintsomi) as an alternative method in the maternal health education in rural Primary Health Care in the Eastern Cape. An informal preliminary observation of a maternal health lesson by the researcher indicated a further need for maternal health educators to introduce storytelling into the health content themes. To re-inforce the maternal health educator lesson on the causes of teenage pregnancy, lifestyles for pregnant women, causes of miscarriage and termination of pregnancy, the Community Health Workers can undoubtedly use isiXhosa iintsomi in selected clinics and maternal waiting homes. As a readily available resource that cuts across all literacy barriers, iintsomi (isiXhosa) fosters a cross-cultural consultation which enables the healthcare worker to convey messages that make sense to the rural women. While the conventional methods of teaching have a tendency to create tension and lack of participation, use of folktale (iintsomi) have huge potential to bring lesson enjoyment; a meaningful interaction and story sharing by the maternal health educator, the pregnant women and greater community; access to important health messages; and strengthened utilisation of Primary Health Care. The study therefore suggests that there is a place for isiXhosa iintsomi: From the Fireplace into the Workplace.
- Full Text:
- Date Issued: 2015
Incorporating socio-economic development initiatives for community development as part of wind farm management in Cookhouse
- Authors: Zambonini, Scott John
- Date: 2015
- Subjects: Economic development Wind power -- Economic aspects -- South Africa -- Eastern Cape , Wind power plants -- Environmental aspects -- South Africa -- Eastern Cape Strategic planning
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/50044 , vital:41995
- Description: The purpose of this case study research was to develop a model for management of the Cookhouse Wind Farm incorporating relevant socio-economic development initiatives for community development in the Cookhouse area. As a result of the REIPPPP’s socio-economic development requirements and the multiple project overlaps of the 50km radius for the beneficiaries of wind farms, management of the Cookhouse Wind Farm face the problem of using the funding to benefit the communities in a sustainable manner. The research started with a structured literature review, followed by a qualitative case study research design using embedded units of analysis and provided a useful insight into socio-economic development in the South African wind power industry. The outcome of the study was in the form of a sustainable socio-economic development model for Cookhouse wind farm management, which highlighted the following four key focus areas: Education, Welfare, Infrastructure and Health. The study concluded with practical recommendations for relevant and sustainable socioeconomic development projects under the four key focus areas. Since the completion of the study two additional renewable energy projects have been approved (Nxuba and Golden Valley) in the same area as Cookhouse which serve to further strengthen the studies purpose.
- Full Text:
- Date Issued: 2015
- Authors: Zambonini, Scott John
- Date: 2015
- Subjects: Economic development Wind power -- Economic aspects -- South Africa -- Eastern Cape , Wind power plants -- Environmental aspects -- South Africa -- Eastern Cape Strategic planning
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/50044 , vital:41995
- Description: The purpose of this case study research was to develop a model for management of the Cookhouse Wind Farm incorporating relevant socio-economic development initiatives for community development in the Cookhouse area. As a result of the REIPPPP’s socio-economic development requirements and the multiple project overlaps of the 50km radius for the beneficiaries of wind farms, management of the Cookhouse Wind Farm face the problem of using the funding to benefit the communities in a sustainable manner. The research started with a structured literature review, followed by a qualitative case study research design using embedded units of analysis and provided a useful insight into socio-economic development in the South African wind power industry. The outcome of the study was in the form of a sustainable socio-economic development model for Cookhouse wind farm management, which highlighted the following four key focus areas: Education, Welfare, Infrastructure and Health. The study concluded with practical recommendations for relevant and sustainable socioeconomic development projects under the four key focus areas. Since the completion of the study two additional renewable energy projects have been approved (Nxuba and Golden Valley) in the same area as Cookhouse which serve to further strengthen the studies purpose.
- Full Text:
- Date Issued: 2015
Factors affecting participation rates in farming in the rural areas of South Africa: case of Amathole District Municipality
- Authors: Zamxaka, Xolisa
- Date: 2015
- Subjects: Agricultural systems -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Farms, Small -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc Agric (Agricultural Economics)
- Identifier: vital:11233 , http://hdl.handle.net/10353/d1021291 , Agricultural systems -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Farms, Small -- South Africa -- Eastern Cape
- Description: South Africa and the rest of developing countries are faced with poverty and poor rural development. Rural participation in agricultural activities is one of the components that can be used to address the poverty challenge facing the people residing in rural areas. The broad objective of this research is to determine factors affecting participation rate in farming in the rural areas of Amathole District Municipality of Eastern Cape. In this study stratified random sampling method was applied in order to choose a sample out of 30 households that were interviewed 13 people belonged to Participants and 17 people belonged to non-Participants. The results from this study show that women participate a lot in farming activities. The multiple regression model was used to test the participation rates of the people in Amathole region specifically Phumlani area. A number of variables were considered in this study to assess the impact of different variables on participation in farming activities. The results showed that about 57% of the respondents are not participating in farming while 43% of the respondents participate. The farming participants that were interviewed all claim that there is a lack in farming support in the area. When there is no support of any kind, rural people would not be motivated to start development projects on their own. Consequently, this lack of farming support in the Phumlani area may have an influence on the number of farming participants. Therefore, the lack of support in the area may serve as a motivation for non-participants not to be influenced to farm. Rural farming needs to be promoted amongst the youth so as to protect and sustain agricultural growth in rural areas. The study has discovered that the youth of Phumlani is not actively involved in farming activities. Government can provide community members with farming resources so as to promote farming in the area. It would be wiser for the government to provide physical farming resources and implements rather than cash grants.
- Full Text:
- Date Issued: 2015
- Authors: Zamxaka, Xolisa
- Date: 2015
- Subjects: Agricultural systems -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Farms, Small -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc Agric (Agricultural Economics)
- Identifier: vital:11233 , http://hdl.handle.net/10353/d1021291 , Agricultural systems -- South Africa -- Eastern Cape , Rural development -- South Africa -- Eastern Cape , Sustainable development -- South Africa -- Eastern Cape , Farms, Small -- South Africa -- Eastern Cape
- Description: South Africa and the rest of developing countries are faced with poverty and poor rural development. Rural participation in agricultural activities is one of the components that can be used to address the poverty challenge facing the people residing in rural areas. The broad objective of this research is to determine factors affecting participation rate in farming in the rural areas of Amathole District Municipality of Eastern Cape. In this study stratified random sampling method was applied in order to choose a sample out of 30 households that were interviewed 13 people belonged to Participants and 17 people belonged to non-Participants. The results from this study show that women participate a lot in farming activities. The multiple regression model was used to test the participation rates of the people in Amathole region specifically Phumlani area. A number of variables were considered in this study to assess the impact of different variables on participation in farming activities. The results showed that about 57% of the respondents are not participating in farming while 43% of the respondents participate. The farming participants that were interviewed all claim that there is a lack in farming support in the area. When there is no support of any kind, rural people would not be motivated to start development projects on their own. Consequently, this lack of farming support in the Phumlani area may have an influence on the number of farming participants. Therefore, the lack of support in the area may serve as a motivation for non-participants not to be influenced to farm. Rural farming needs to be promoted amongst the youth so as to protect and sustain agricultural growth in rural areas. The study has discovered that the youth of Phumlani is not actively involved in farming activities. Government can provide community members with farming resources so as to promote farming in the area. It would be wiser for the government to provide physical farming resources and implements rather than cash grants.
- Full Text:
- Date Issued: 2015
Investigating the radical democratic potential of social media use by new social movements in South Africa
- Authors: Zdanow, Carla
- Date: 2015
- Subjects: Social media -- South Africa , Social movements -- South Africa , Neoliberalism -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/4310 , vital:20583
- Description: Since its inception, the internet ‒ and in particular Web 2.0 ‒ have been valorized as potentially revolutionary democratic spaces. Despite the emergence of concerns over the progressively neoliberal orientation and narcissistic effects of the internet, evidence of the radical democratic potential of this media has received considerable attention. This thesis is orientated around both an exploration of such evidence, and a consideration of its relevance for South Africa. In this regard, the thesis commences with an exploration of the neoliberal underpinnings of the internet and the growing translation of dominant neoliberal discourses into the online practices of mainstream liberal democratic politics. Focus then shifts toward the mounting influence of alternative radical democratic positions online, through an investigation of the virtual manifestations of deliberative, autonomous, and agonistic approaches to radical democracy. And following an examination of the online political practices of selected recent global social movements, the primacy of agonism in online expressions of radical democracy is advanced. In turn, resonances and dissonances between the online activity and practices of such global social movements, and the use of the internet and social media by well-known South African new social movements, are explored. Finally, this thesis concludes by recommending a fourfold new media approach through which the agonistic radical democratic potential of the internet can be realized more fully by the new social movements of South Africa.
- Full Text:
- Date Issued: 2015
- Authors: Zdanow, Carla
- Date: 2015
- Subjects: Social media -- South Africa , Social movements -- South Africa , Neoliberalism -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/4310 , vital:20583
- Description: Since its inception, the internet ‒ and in particular Web 2.0 ‒ have been valorized as potentially revolutionary democratic spaces. Despite the emergence of concerns over the progressively neoliberal orientation and narcissistic effects of the internet, evidence of the radical democratic potential of this media has received considerable attention. This thesis is orientated around both an exploration of such evidence, and a consideration of its relevance for South Africa. In this regard, the thesis commences with an exploration of the neoliberal underpinnings of the internet and the growing translation of dominant neoliberal discourses into the online practices of mainstream liberal democratic politics. Focus then shifts toward the mounting influence of alternative radical democratic positions online, through an investigation of the virtual manifestations of deliberative, autonomous, and agonistic approaches to radical democracy. And following an examination of the online political practices of selected recent global social movements, the primacy of agonism in online expressions of radical democracy is advanced. In turn, resonances and dissonances between the online activity and practices of such global social movements, and the use of the internet and social media by well-known South African new social movements, are explored. Finally, this thesis concludes by recommending a fourfold new media approach through which the agonistic radical democratic potential of the internet can be realized more fully by the new social movements of South Africa.
- Full Text:
- Date Issued: 2015
Meso-and axially-modified IrIIItriarylcorroles with tunable electrocatalytic properties
- Zhang, Xifeng, Wang, Yu, Zhu, Weihua, Mack, John, Soy, Rodah C, Nyokong, Tebello, Liang, Xu
- Authors: Zhang, Xifeng , Wang, Yu , Zhu, Weihua , Mack, John , Soy, Rodah C , Nyokong, Tebello , Liang, Xu
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/190851 , vital:45034 , xlink:href="https://doi.org/10.1016/j.molstruc.2015.02.040"
- Description: The synthesis of three A2B type Ir(III)triarylcorroles with meso-aryl substituents that provide electron donating (push) and withdrawing (pull) properties and three A3 type IrIIItriphenylcorroles with differing pyridine axial ligands is reported, along with their structural characterization. An analysis of the structure-property relationships in the optical and redox properties has been carried out by comparing their optical spectroscopy and electrochemistry to trends predicted in DFT and TD-DFT calculations. The results demonstrate that A2B type IrIIItriarylcorroles are highly efficient electrocatalyzed oxygen reduction reactions (ORRs) and that their reactivity can be modulated by modulating the electronic structure by changing the nature of the meso-substituent at the B-positions, and even axial pyridine ligands.
- Full Text:
- Date Issued: 2015
- Authors: Zhang, Xifeng , Wang, Yu , Zhu, Weihua , Mack, John , Soy, Rodah C , Nyokong, Tebello , Liang, Xu
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/190851 , vital:45034 , xlink:href="https://doi.org/10.1016/j.molstruc.2015.02.040"
- Description: The synthesis of three A2B type Ir(III)triarylcorroles with meso-aryl substituents that provide electron donating (push) and withdrawing (pull) properties and three A3 type IrIIItriphenylcorroles with differing pyridine axial ligands is reported, along with their structural characterization. An analysis of the structure-property relationships in the optical and redox properties has been carried out by comparing their optical spectroscopy and electrochemistry to trends predicted in DFT and TD-DFT calculations. The results demonstrate that A2B type IrIIItriarylcorroles are highly efficient electrocatalyzed oxygen reduction reactions (ORRs) and that their reactivity can be modulated by modulating the electronic structure by changing the nature of the meso-substituent at the B-positions, and even axial pyridine ligands.
- Full Text:
- Date Issued: 2015
Agathis bishopi, a larval parasitoid of false codling moth Thaumatotibia leucotreta: laboratory rearing and effect of adult food on parasitism and longevity
- Zimba, Kennedy J, Moore, Sean D, Heshula, LU, Hill, Martin P
- Authors: Zimba, Kennedy J , Moore, Sean D , Heshula, LU , Hill, Martin P
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/406985 , vital:70328 , xlink:href="https://hdl.handle.net/10520/EJC185849"
- Description: Agathis bishopi (Nixon) (Hymenoptera: Braconidae) is a koinobiont larval endoparasitoid of false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), a pest of economic importance on citrus in South Africa. In the field Agathis bishopi was found to parasitise up to 34 % of FCM larvae in fruit, reflecting reasonable biocontrol potential. Improving the rearing of A. bishopi would therefore complement the existing biocontrol strategies for FCM. In several parasitic wasps, sugar concentration and feeding duration has been shown to influence parasitism and longevity. However, their effect on parasitism and longevity of A. bishopi is unknown. In the present study a rearing protocol for A. bishopi is described, including evaluation of the effects of honey concentration on parasitoid longevity. On average, 18.2%of FCM larvae in rearing containers were parasitised under the rearing protocol described. Cotton wool, instead of paper towelling, as honey carrier for feeding parasitoids in rearing containers significantly increased parasitism and yield of offspring. Furthermore, longevity significantly increased with higher concentrations of honey. Maximum lifespan duration for male and female parasitoids was achieved when parasitoids were fed on 36 % (w/v) honey. Results from this study indicate that A. bishopi requires a sufficient concentration of sugar, coupled with frequent and prolonged feeding on a cotton wool substrate, in order to achieve maximum parasitism and longevity. Such information provides a basis for optimising mass-rearing and longevity of A. bishopi and parasitism of FCM in orchards.
- Full Text:
- Date Issued: 2015
- Authors: Zimba, Kennedy J , Moore, Sean D , Heshula, LU , Hill, Martin P
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/406985 , vital:70328 , xlink:href="https://hdl.handle.net/10520/EJC185849"
- Description: Agathis bishopi (Nixon) (Hymenoptera: Braconidae) is a koinobiont larval endoparasitoid of false codling moth (FCM), Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae), a pest of economic importance on citrus in South Africa. In the field Agathis bishopi was found to parasitise up to 34 % of FCM larvae in fruit, reflecting reasonable biocontrol potential. Improving the rearing of A. bishopi would therefore complement the existing biocontrol strategies for FCM. In several parasitic wasps, sugar concentration and feeding duration has been shown to influence parasitism and longevity. However, their effect on parasitism and longevity of A. bishopi is unknown. In the present study a rearing protocol for A. bishopi is described, including evaluation of the effects of honey concentration on parasitoid longevity. On average, 18.2%of FCM larvae in rearing containers were parasitised under the rearing protocol described. Cotton wool, instead of paper towelling, as honey carrier for feeding parasitoids in rearing containers significantly increased parasitism and yield of offspring. Furthermore, longevity significantly increased with higher concentrations of honey. Maximum lifespan duration for male and female parasitoids was achieved when parasitoids were fed on 36 % (w/v) honey. Results from this study indicate that A. bishopi requires a sufficient concentration of sugar, coupled with frequent and prolonged feeding on a cotton wool substrate, in order to achieve maximum parasitism and longevity. Such information provides a basis for optimising mass-rearing and longevity of A. bishopi and parasitism of FCM in orchards.
- Full Text:
- Date Issued: 2015
Host searching and oviposition behaviour of Agathis bishopi (Hymenoptera: Braconidae), a larval parasitoid of false codling moth, Thaumatotibia leucotreta (Lepidoptera: Tortricidae): a potential proxy indicator for fruit infestation
- Zimba, Kennedy J, Heshula, LU, Moore, Sean D, Hill, Martin P
- Authors: Zimba, Kennedy J , Heshula, LU , Moore, Sean D , Hill, Martin P
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/407019 , vital:70330 , xlink:href="https://hdl.handle.net/10520/EJC195073"
- Description: Agathis bishopi (Nixon) (Hymenoptera: Braconidae)is an arrhenotokous larval endoparasitoid of Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) (Gendall 2007; Hofmeyr et al. 2015) commonly known as false codling moth (FCM), a major pest of citrus in South Africa (Moore et al. 2004; Malan et al. 2011). Under field conditions, A. bishopi was identified attacking more than 34% of FCM larvae in fruit, showing good biocontrol potential (Gendall 2007). Preference by A. bishopi for parasitising the early instars of its concealed host suggests that the parasitoid has strong natural host location ability (Sishuba 2003; Gendall 2007).
- Full Text:
- Date Issued: 2015
- Authors: Zimba, Kennedy J , Heshula, LU , Moore, Sean D , Hill, Martin P
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/407019 , vital:70330 , xlink:href="https://hdl.handle.net/10520/EJC195073"
- Description: Agathis bishopi (Nixon) (Hymenoptera: Braconidae)is an arrhenotokous larval endoparasitoid of Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) (Gendall 2007; Hofmeyr et al. 2015) commonly known as false codling moth (FCM), a major pest of citrus in South Africa (Moore et al. 2004; Malan et al. 2011). Under field conditions, A. bishopi was identified attacking more than 34% of FCM larvae in fruit, showing good biocontrol potential (Gendall 2007). Preference by A. bishopi for parasitising the early instars of its concealed host suggests that the parasitoid has strong natural host location ability (Sishuba 2003; Gendall 2007).
- Full Text:
- Date Issued: 2015
Agathis bishopi (Hymenoptera: Braconidae) as a potential tool for detecting oranges infested with Thaumatotibia leucotreta (Lepidoptera: Tortricidae)
- Zimba, Kennedy J, Hill, Martin P, Moore, Sean D, Heshula, Unathi
- Authors: Zimba, Kennedy J , Hill, Martin P , Moore, Sean D , Heshula, Unathi
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/423955 , vital:72108 , xlink:href="https://doi.org/10.1007/s10905-015-9526-0"
- Description: In South Africa, Thaumatotibia leucotreta is a key pest of citrus impacting its production and trade. Detection of newly infested fruit by visual inspection is challenging and poses a risk of packing infested with healthy fruit for export. Agathis bishopi is a larval endoparasitoid of T. leucotreta, attacking early larval instars. Understanding how A. bishopi parasitoids locate fruit infested with their host is of interest for developing an efficient detector for T. leucotreta infested fruit. The response of female adult A. bishopi parasitoids to olfactory and visual cues associated with T. leucotreta infested fruit were evaluated using a Y-tube olfactometer and flight tunnel. Agathis bishopi parasitoids were strongly attracted to infested fruit over healthy fruit, either when only olfactory or combinations of visual and olfactory cues were offered. Among the four synthetic compounds tested, D-limonene and ocimene elicited a strong attraction to parasitoids with response rates of 92 % and 72 % respectively. A blend of four synthetic compounds simulating T. leucotreta infested fruit odour equally elicited strong attraction to parasitoids (84 % response rate). Attraction of parasitoids to infested fruit cues was heightened by prior experience, suggesting the occurrence of associative learning. Results from this study indicate that A. bishopi parasitoids mainly rely on olfactory cues in host habitat location and that D-limonene and ocimene are the major attractants in infested fruit volatiles. These findings and the potential for manipulating A. bishopi for detection of infested fruit in the packhouse are discussed.
- Full Text:
- Date Issued: 2015
- Authors: Zimba, Kennedy J , Hill, Martin P , Moore, Sean D , Heshula, Unathi
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/423955 , vital:72108 , xlink:href="https://doi.org/10.1007/s10905-015-9526-0"
- Description: In South Africa, Thaumatotibia leucotreta is a key pest of citrus impacting its production and trade. Detection of newly infested fruit by visual inspection is challenging and poses a risk of packing infested with healthy fruit for export. Agathis bishopi is a larval endoparasitoid of T. leucotreta, attacking early larval instars. Understanding how A. bishopi parasitoids locate fruit infested with their host is of interest for developing an efficient detector for T. leucotreta infested fruit. The response of female adult A. bishopi parasitoids to olfactory and visual cues associated with T. leucotreta infested fruit were evaluated using a Y-tube olfactometer and flight tunnel. Agathis bishopi parasitoids were strongly attracted to infested fruit over healthy fruit, either when only olfactory or combinations of visual and olfactory cues were offered. Among the four synthetic compounds tested, D-limonene and ocimene elicited a strong attraction to parasitoids with response rates of 92 % and 72 % respectively. A blend of four synthetic compounds simulating T. leucotreta infested fruit odour equally elicited strong attraction to parasitoids (84 % response rate). Attraction of parasitoids to infested fruit cues was heightened by prior experience, suggesting the occurrence of associative learning. Results from this study indicate that A. bishopi parasitoids mainly rely on olfactory cues in host habitat location and that D-limonene and ocimene are the major attractants in infested fruit volatiles. These findings and the potential for manipulating A. bishopi for detection of infested fruit in the packhouse are discussed.
- Full Text:
- Date Issued: 2015
Using the larval parasitoid, Agathis bishopi (Nixon) (Hymenoptera: Braconidae), for early detection of false codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) infested fruit
- Authors: Zimba, Kennedy Josaya
- Date: 2015
- Subjects: Cryptophlebia leucotreta , Citrus -- Diseases and pests -- South Africa , Pests -- Biological control -- South Africa , Cryptophlebia leucotreta -- Detection , Parasitoids -- Hosts , Braconidae
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5919 , http://hdl.handle.net/10962/d1017186
- Description: Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) is one of the major citrus pests of economic importance for South Africa’s citrus industry. It is endemic to Africa, and therefore a phytosanitary pest with zero tolerance by most export markets. The cryptic nature of T. leucotreta makes visual inspection an inefficient method for detecting neonate larvae in fruit in the packhouse. Therefore, a more accurate method for sorting infested fruit at the packhouse, particularly for newly infested fruit could ensure market access. A recent study showed that fruit infested by T. leucotreta emit a chemical profile different from that of a healthy fruit. Several studies provide evidence that parasitoids locate their hosts feeding on fruit by exploiting the novel chemical profiles produced due to host herbivory. The aim of this study was to evaluate the potential of using the naturally occurring behaviour of a larval parasitoid Agathis bishopi (Nixon) (Hymenoptera: Braconidae) for detection of T. leucotreta infested fruit, by determining which compound in infested fruit is attractive to parasitoids. Ytube olfactometer and flight-tunnel bioassays with healthy and T. leucotreta infested fruit showed a significantly stronger response of A. bishopi female parasitoids to infested fruit. Among the volatile compounds associated with T. leucotreta infested fruit, D-limonene elicited the strongest attraction to A. bishopi female parasitoids. Attraction of mated A. bishopi female parasitoids to T. leucotreta infested fruit and D-limonene significantly increased after oviposition experience. Behavioural responses of A. bishopi female parasitoids that were associated with T. leucotreta infested fruit were investigated to determine which behaviours are distinct and interpretable. Probing and oviposition behaviours were the most noticeable and were only elicited on infested fruit when parasitoids contacted T. leucotreta frass, indicating that chemical compounds in frass are short-range cues used for final host location. Since production of D-limonene by fruit is elevated due to herbivory by different pests including mechanical injury on fruit, response of A. bishopi female parasitoids to compounds in frass offers a more specific and potentially useful mechanism for development of a detection system for T. leucotreta infested fruit. Chemical analysis of T. leucotreta frass and conditioning A. bishopi parasitoids to respond behaviourally to compounds in frass is proposed.
- Full Text:
- Date Issued: 2015
- Authors: Zimba, Kennedy Josaya
- Date: 2015
- Subjects: Cryptophlebia leucotreta , Citrus -- Diseases and pests -- South Africa , Pests -- Biological control -- South Africa , Cryptophlebia leucotreta -- Detection , Parasitoids -- Hosts , Braconidae
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5919 , http://hdl.handle.net/10962/d1017186
- Description: Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae) is one of the major citrus pests of economic importance for South Africa’s citrus industry. It is endemic to Africa, and therefore a phytosanitary pest with zero tolerance by most export markets. The cryptic nature of T. leucotreta makes visual inspection an inefficient method for detecting neonate larvae in fruit in the packhouse. Therefore, a more accurate method for sorting infested fruit at the packhouse, particularly for newly infested fruit could ensure market access. A recent study showed that fruit infested by T. leucotreta emit a chemical profile different from that of a healthy fruit. Several studies provide evidence that parasitoids locate their hosts feeding on fruit by exploiting the novel chemical profiles produced due to host herbivory. The aim of this study was to evaluate the potential of using the naturally occurring behaviour of a larval parasitoid Agathis bishopi (Nixon) (Hymenoptera: Braconidae) for detection of T. leucotreta infested fruit, by determining which compound in infested fruit is attractive to parasitoids. Ytube olfactometer and flight-tunnel bioassays with healthy and T. leucotreta infested fruit showed a significantly stronger response of A. bishopi female parasitoids to infested fruit. Among the volatile compounds associated with T. leucotreta infested fruit, D-limonene elicited the strongest attraction to A. bishopi female parasitoids. Attraction of mated A. bishopi female parasitoids to T. leucotreta infested fruit and D-limonene significantly increased after oviposition experience. Behavioural responses of A. bishopi female parasitoids that were associated with T. leucotreta infested fruit were investigated to determine which behaviours are distinct and interpretable. Probing and oviposition behaviours were the most noticeable and were only elicited on infested fruit when parasitoids contacted T. leucotreta frass, indicating that chemical compounds in frass are short-range cues used for final host location. Since production of D-limonene by fruit is elevated due to herbivory by different pests including mechanical injury on fruit, response of A. bishopi female parasitoids to compounds in frass offers a more specific and potentially useful mechanism for development of a detection system for T. leucotreta infested fruit. Chemical analysis of T. leucotreta frass and conditioning A. bishopi parasitoids to respond behaviourally to compounds in frass is proposed.
- Full Text:
- Date Issued: 2015