Can Perceptions of Environmental and Climate Change in Island Communities Assist in Adaptation Planning Locally?
- Aswani, Shankar, Vaccaro, Ismael, Abernethy, Kirsten, Albert, Simon, De Pablo, Javier Fernández-López
- Authors: Aswani, Shankar , Vaccaro, Ismael , Abernethy, Kirsten , Albert, Simon , De Pablo, Javier Fernández-López
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/421841 , vital:71889 , xlink:href="https://doi.org/10.1007/s00267-015-0572-3"
- Description: Local perceptions of environmental and climate change, as well as associated adaptations made by local populations, are fundamental for designing comprehensive and inclusive mitigation and adaptation plans both locally and nationally. In this paper, we analyze people’s perceptions of environmental and climate-related transformations in communities across the Western Solomon Islands through ethnographic and geospatial methods. Specifically, we documented people’s observed changes over the past decades across various environmental domains, and for each change, we asked respondents to identify the causes, timing, and people’s adaptive responses. We also incorporated this information into a geographical information system database to produce broad-scale base maps of local perceptions of environmental change. Results suggest that people detected changes that tended to be acute (e.g., water clarity, logging intensity, and agricultural diseases). We inferred from these results that most local observations of and adaptations to change were related to parts of environment/ecosystem that are most directly or indirectly related to harvesting strategies. On the other hand, people were less aware of slower insidious/chronic changes identified by scientific studies. For the Solomon Islands and similar contexts in the insular tropics, a broader anticipatory adaptation planning strategy to climate change should include a mix of local scientific studies and local observations of ongoing ecological changes.
- Full Text:
- Date Issued: 2015
- Authors: Aswani, Shankar , Vaccaro, Ismael , Abernethy, Kirsten , Albert, Simon , De Pablo, Javier Fernández-López
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/421841 , vital:71889 , xlink:href="https://doi.org/10.1007/s00267-015-0572-3"
- Description: Local perceptions of environmental and climate change, as well as associated adaptations made by local populations, are fundamental for designing comprehensive and inclusive mitigation and adaptation plans both locally and nationally. In this paper, we analyze people’s perceptions of environmental and climate-related transformations in communities across the Western Solomon Islands through ethnographic and geospatial methods. Specifically, we documented people’s observed changes over the past decades across various environmental domains, and for each change, we asked respondents to identify the causes, timing, and people’s adaptive responses. We also incorporated this information into a geographical information system database to produce broad-scale base maps of local perceptions of environmental change. Results suggest that people detected changes that tended to be acute (e.g., water clarity, logging intensity, and agricultural diseases). We inferred from these results that most local observations of and adaptations to change were related to parts of environment/ecosystem that are most directly or indirectly related to harvesting strategies. On the other hand, people were less aware of slower insidious/chronic changes identified by scientific studies. For the Solomon Islands and similar contexts in the insular tropics, a broader anticipatory adaptation planning strategy to climate change should include a mix of local scientific studies and local observations of ongoing ecological changes.
- Full Text:
- Date Issued: 2015
Scientific frontiers in the management of coral reefs
- Aswani, Shankar, Mumby, Peter J, Baker, Andrew C, Christie, Patrick, McCook, Laurence J, Steneck, Robert S, Richmond, Robert H
- Authors: Aswani, Shankar , Mumby, Peter J , Baker, Andrew C , Christie, Patrick , McCook, Laurence J , Steneck, Robert S , Richmond, Robert H
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/422003 , vital:71904 , xlink:href="https://doi.org/10.3389/fmars.2015.00050"
- Description: Coral reefs are subjected globally to a variety of natural and anthropogenic stressors that often act synergistically. Today, reversing ongoing and future coral reef degradation presents significant challenges and countering this negative trend will take considerable efforts and investments. Scientific knowledge can inform and guide the requisite decision-making process and offer practical solutions to the problem of protection as the effects of climate change exacerbate. However, implementation of solutions presently lags far behind the pace required to reverse global declines, and there is a need for an urgent and significant step-up in the extent and range of strategies being implemented. In this paper, we consider scientific frontiers in natural and social science research that can help build stronger support for reef management and improve the efficacy of interventions. We cover various areas including: (1) enhancing the case for reef conservation and management, (2) dealing with local stressors on reefs, (3) addressing global climate change impacts, (4) and reviewing various approaches to the governance of coral reefs. In sum, we consider scientific frontiers in natural and social science that will require further attention in coming years as managers work toward building stronger support for reef management and improve the efficacy of local interventions.
- Full Text:
- Date Issued: 2015
- Authors: Aswani, Shankar , Mumby, Peter J , Baker, Andrew C , Christie, Patrick , McCook, Laurence J , Steneck, Robert S , Richmond, Robert H
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/422003 , vital:71904 , xlink:href="https://doi.org/10.3389/fmars.2015.00050"
- Description: Coral reefs are subjected globally to a variety of natural and anthropogenic stressors that often act synergistically. Today, reversing ongoing and future coral reef degradation presents significant challenges and countering this negative trend will take considerable efforts and investments. Scientific knowledge can inform and guide the requisite decision-making process and offer practical solutions to the problem of protection as the effects of climate change exacerbate. However, implementation of solutions presently lags far behind the pace required to reverse global declines, and there is a need for an urgent and significant step-up in the extent and range of strategies being implemented. In this paper, we consider scientific frontiers in natural and social science research that can help build stronger support for reef management and improve the efficacy of interventions. We cover various areas including: (1) enhancing the case for reef conservation and management, (2) dealing with local stressors on reefs, (3) addressing global climate change impacts, (4) and reviewing various approaches to the governance of coral reefs. In sum, we consider scientific frontiers in natural and social science that will require further attention in coming years as managers work toward building stronger support for reef management and improve the efficacy of local interventions.
- Full Text:
- Date Issued: 2015
Planning for the Future: Mapping Anticipated Environmental and Social Impacts in a Nascent Tourism Destination
- Aswani, Shankar, Diedrich, Amy, Currier, Kitty
- Authors: Aswani, Shankar , Diedrich, Amy , Currier, Kitty
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/421980 , vital:71901 , xlink:href="https://doi.org/10.1080/08941920.2015.1020582"
- Description: Tourism is a significant driver of social and ecological change in developing countries, particularly in small-island states, which are susceptible to tourism impacts due to their particular social and environmental characteristics. In this article we present a participatory mapping approach to obtaining spatially explicit local perceptions of future environmental and social change resulting from tourism development, as well as addressing the different community conflicts that may arise through the introduction of tourism in the future in a Solomon Islands community. The results show that spatial conflicts within a community over territory and associated resources are likely to occur when designing natural resource management and tourism development plans. This knowledge can help us increase the future sustainability of tourism in nascent small-islands destinations, particularly in vulnerable regions such as Roviana, which have experienced very little tourism development and will likely experience more in the near future.
- Full Text:
- Date Issued: 2015
- Authors: Aswani, Shankar , Diedrich, Amy , Currier, Kitty
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/421980 , vital:71901 , xlink:href="https://doi.org/10.1080/08941920.2015.1020582"
- Description: Tourism is a significant driver of social and ecological change in developing countries, particularly in small-island states, which are susceptible to tourism impacts due to their particular social and environmental characteristics. In this article we present a participatory mapping approach to obtaining spatially explicit local perceptions of future environmental and social change resulting from tourism development, as well as addressing the different community conflicts that may arise through the introduction of tourism in the future in a Solomon Islands community. The results show that spatial conflicts within a community over territory and associated resources are likely to occur when designing natural resource management and tourism development plans. This knowledge can help us increase the future sustainability of tourism in nascent small-islands destinations, particularly in vulnerable regions such as Roviana, which have experienced very little tourism development and will likely experience more in the near future.
- Full Text:
- Date Issued: 2015
Change in Roviana Lagoon Coral Reef Ethnobiology
- Aswani, Shankar, Albert, Simon
- Authors: Aswani, Shankar , Albert, Simon
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/421868 , vital:71892 , xlink:href="https://doi.org/10.1007/978-3-319-23763-3"
- Description: Coral reefs are iconic for their beauty and biodiversity, and are of great socioeconomic and cultural importance for many coastal communities across the tropics. However, little is known about people’s local classification and their social and ecological relationship with these habitats. This chapter describes Roviana people’s changing ecological and social relationship with their coral reefs, which are increasingly being damaged by humans. First, we combined ecological and social data to describe people’s classification of local coral reefs in tandem with the productive practices conducted in these habitats. Second, we examined local perceptions and recognized effects of environmental and climatic changes on reefs over the last two decades. Finally, we measured changes in fishing activities and in the taxonomic systems (between 1995 and 2011) to evaluate if recent social and economic change has led to the erosion of marine indigenous ecological knowledge and associated practices. Studying people’s changing perceptions of their coral reefs is crucial to understand their ability to identify and adapt to environmental transformations. Simply, the way local people perceive the state of the environment is not only important in terms of changes in local epistemology but also has important implications for how resources are used and managed, and this information can be coupled with scientific one for a broader management strategy.
- Full Text:
- Date Issued: 2015
- Authors: Aswani, Shankar , Albert, Simon
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/421868 , vital:71892 , xlink:href="https://doi.org/10.1007/978-3-319-23763-3"
- Description: Coral reefs are iconic for their beauty and biodiversity, and are of great socioeconomic and cultural importance for many coastal communities across the tropics. However, little is known about people’s local classification and their social and ecological relationship with these habitats. This chapter describes Roviana people’s changing ecological and social relationship with their coral reefs, which are increasingly being damaged by humans. First, we combined ecological and social data to describe people’s classification of local coral reefs in tandem with the productive practices conducted in these habitats. Second, we examined local perceptions and recognized effects of environmental and climatic changes on reefs over the last two decades. Finally, we measured changes in fishing activities and in the taxonomic systems (between 1995 and 2011) to evaluate if recent social and economic change has led to the erosion of marine indigenous ecological knowledge and associated practices. Studying people’s changing perceptions of their coral reefs is crucial to understand their ability to identify and adapt to environmental transformations. Simply, the way local people perceive the state of the environment is not only important in terms of changes in local epistemology but also has important implications for how resources are used and managed, and this information can be coupled with scientific one for a broader management strategy.
- Full Text:
- Date Issued: 2015
Investigating the use of social networking via mobile phone as an extension tool in small-scale (emerging) agriculture in selected farming communities in the Cacadu District
- Authors: Atinuke, Jimoh Rashidat
- Date: 2015
- Subjects: Farms, Small -- Technological innovations -- South Africa -- Eastern Cape Communication in economic development -- South Africa -- Eastern Cape , Information technology -- Social aspects -- South Africa -- Eastern Cape Digital media -- South Africa -- Eastern Cape Social media -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/18398 , vital:28633
- Description: We live in the era in which the internet is now available on the majority of mobile phones at a very cheaper rate. This advancement in technology has created a boom in the use of mobile phone social networking as a primary communication tool - not only for individuals but also commonly used by professionals in most fields. The trends and growing usage of social networking via mobile phone indicate a potentially effective new platform for increasing production especially in agricultural sectors. In this age of information technology, farming communities can be empowered with the latest information and knowledge through mobile phone social networking to enhance agricultural development. The study investigates the use of mobile phone social networking as an extension tool in small-scale (emerging) farmers in selected farming communities in the Cacadu District Municipality of the Eastern Cape of South Africa. Specifically, the study investigates the use of available mobile phone social networks; what they are used for; and the importance and benefits of social networking both generally and to the farming communities. The study further identifies problems inhibiting the use of mobile phone social networking. Other channels through which the small-scale (emerging) farmers acquire agricultural information, aside from via mobile phone, and the type of agricultural information these farmers acquire, are also investigated. This study focuses on the use - and not the testing or adoption of - mobile phone social networking in small-scale (emerging) agriculture. In the exercise to investigate the use of social networking apps via mobile phone, data was collected from 40 small-scale (emerging) farmers using a purposive sampling method. This study used a survey design, exploratory and descriptive research methodologies. Data was captured by administering a questionnaire through personal face-to-face interviews. Descriptive statistics such as simple frequency tables, percentages and bar graphs were used. From the Chi-square testing, it was found that agricultural knowledge levels, internet access and size of production farm land influence the use of social networking by the small-scale (emerging) farmers. However, the result of this study showed that gender, age, other income and educational level of the small-scale (emerging) farmers are not statistically significant determinants of social networking use. Cronbach’s alpha coefficient was found to be 0.95. To establish the strength of associations of the variables, Cramer’s V ranging between 0.04 and 0.9 (signifying relationships from negligible to very strong association) was used. The findings showed that different social networks are used by the farming communities, such as WhatsApp, Facebook, and Blackberry messenger, MXit, Twitter and YouTube. The various uses of these social networks by the farmers are discussed. The benefits and problems inhibiting their use are also outlined. Other sources of acquiring agricultural information by the farmers aside from social networking via mobile phone are examined. The result of the study shows that [agricultural extension officers, other farmers, farmers’ discussion groups, friends and family,] are major sources of agricultural information to the small-scale (emerging) farmers while other sources are television, radio, print media and result demonstrations. The study suggests that to enhance mobile phone social networking to ensure that timely and effective agricultural information is readily accessible to the small-scale (emerging) farmers. These include agricultural extension officers making optimal use of social networking via mobile phone, due to the strong interaction and trust between them and the farmers. This interaction can be instrumental in the effective use of this technology as a resourceful medium for accessing agricultural information to enhance productivity. Proper awareness and understanding of the potential and benefits of mobile social networking by the farmers will motivate the small-scale (emerging) farmers to use the technology for effective agricultural purposes. Also, ensuring the availability of agricultural information to small-scale (emerging) farmers by setting up on-line pages or websites to discuss matters of interest and educate and update farmers on agricultural issues should be encouraged. This may attract the younger generation and the youth to participate fully in agricultural activities - thereby enhancing agricultural development.
- Full Text:
- Date Issued: 2015
- Authors: Atinuke, Jimoh Rashidat
- Date: 2015
- Subjects: Farms, Small -- Technological innovations -- South Africa -- Eastern Cape Communication in economic development -- South Africa -- Eastern Cape , Information technology -- Social aspects -- South Africa -- Eastern Cape Digital media -- South Africa -- Eastern Cape Social media -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: http://hdl.handle.net/10948/18398 , vital:28633
- Description: We live in the era in which the internet is now available on the majority of mobile phones at a very cheaper rate. This advancement in technology has created a boom in the use of mobile phone social networking as a primary communication tool - not only for individuals but also commonly used by professionals in most fields. The trends and growing usage of social networking via mobile phone indicate a potentially effective new platform for increasing production especially in agricultural sectors. In this age of information technology, farming communities can be empowered with the latest information and knowledge through mobile phone social networking to enhance agricultural development. The study investigates the use of mobile phone social networking as an extension tool in small-scale (emerging) farmers in selected farming communities in the Cacadu District Municipality of the Eastern Cape of South Africa. Specifically, the study investigates the use of available mobile phone social networks; what they are used for; and the importance and benefits of social networking both generally and to the farming communities. The study further identifies problems inhibiting the use of mobile phone social networking. Other channels through which the small-scale (emerging) farmers acquire agricultural information, aside from via mobile phone, and the type of agricultural information these farmers acquire, are also investigated. This study focuses on the use - and not the testing or adoption of - mobile phone social networking in small-scale (emerging) agriculture. In the exercise to investigate the use of social networking apps via mobile phone, data was collected from 40 small-scale (emerging) farmers using a purposive sampling method. This study used a survey design, exploratory and descriptive research methodologies. Data was captured by administering a questionnaire through personal face-to-face interviews. Descriptive statistics such as simple frequency tables, percentages and bar graphs were used. From the Chi-square testing, it was found that agricultural knowledge levels, internet access and size of production farm land influence the use of social networking by the small-scale (emerging) farmers. However, the result of this study showed that gender, age, other income and educational level of the small-scale (emerging) farmers are not statistically significant determinants of social networking use. Cronbach’s alpha coefficient was found to be 0.95. To establish the strength of associations of the variables, Cramer’s V ranging between 0.04 and 0.9 (signifying relationships from negligible to very strong association) was used. The findings showed that different social networks are used by the farming communities, such as WhatsApp, Facebook, and Blackberry messenger, MXit, Twitter and YouTube. The various uses of these social networks by the farmers are discussed. The benefits and problems inhibiting their use are also outlined. Other sources of acquiring agricultural information by the farmers aside from social networking via mobile phone are examined. The result of the study shows that [agricultural extension officers, other farmers, farmers’ discussion groups, friends and family,] are major sources of agricultural information to the small-scale (emerging) farmers while other sources are television, radio, print media and result demonstrations. The study suggests that to enhance mobile phone social networking to ensure that timely and effective agricultural information is readily accessible to the small-scale (emerging) farmers. These include agricultural extension officers making optimal use of social networking via mobile phone, due to the strong interaction and trust between them and the farmers. This interaction can be instrumental in the effective use of this technology as a resourceful medium for accessing agricultural information to enhance productivity. Proper awareness and understanding of the potential and benefits of mobile social networking by the farmers will motivate the small-scale (emerging) farmers to use the technology for effective agricultural purposes. Also, ensuring the availability of agricultural information to small-scale (emerging) farmers by setting up on-line pages or websites to discuss matters of interest and educate and update farmers on agricultural issues should be encouraged. This may attract the younger generation and the youth to participate fully in agricultural activities - thereby enhancing agricultural development.
- Full Text:
- Date Issued: 2015
Analysis of calendar effects and market anomalies on the Johannesburg Stock Exchange
- Atsin, Achiapo Jessica Lisette
- Authors: Atsin, Achiapo Jessica Lisette
- Date: 2015
- Subjects: Stock exchanges -- South Africa -- Johannesburg , Stocks -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:9028 , http://hdl.handle.net/10948/d1020372
- Description: This study sought to empirically investigate the existence of calendar effects and market anomalies on the JSE using monthly and daily closing prices of the ALSI, Top 40, Mid Cap and Small Cap index; as well as, daily closing prices on the Value, Growth and Dividend Plus index during the sample period 2002 – 2013. The anomalies analysed are the January effect, the weekend effect, the size effect, the value effect, and the dividend yield effect. The empirical analysis uses a number of MSAR with a different number of regimes and lag orders. The results from the investigation of the January effect show the non-existence of the January effect and the value effect on the JSE during the periods 2002 – 2013 and 2004 – 2013, respectively. However, the weekend effect was found significant in the Mid Cap and the Small Cap index, and the size effect was also found significant during the same period 2002 - 2013. Finally the results from a Granger causality test concluded that there is a relationship between the returns on the Dividend Plus index and the ALSI, effectively proving the existence of the dividend yield effect on the JSE between 2006 and 2013. Additionally, the anomalies found imply the opportunity for investors to make returns above buy-and-hold.
- Full Text:
- Date Issued: 2015
- Authors: Atsin, Achiapo Jessica Lisette
- Date: 2015
- Subjects: Stock exchanges -- South Africa -- Johannesburg , Stocks -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:9028 , http://hdl.handle.net/10948/d1020372
- Description: This study sought to empirically investigate the existence of calendar effects and market anomalies on the JSE using monthly and daily closing prices of the ALSI, Top 40, Mid Cap and Small Cap index; as well as, daily closing prices on the Value, Growth and Dividend Plus index during the sample period 2002 – 2013. The anomalies analysed are the January effect, the weekend effect, the size effect, the value effect, and the dividend yield effect. The empirical analysis uses a number of MSAR with a different number of regimes and lag orders. The results from the investigation of the January effect show the non-existence of the January effect and the value effect on the JSE during the periods 2002 – 2013 and 2004 – 2013, respectively. However, the weekend effect was found significant in the Mid Cap and the Small Cap index, and the size effect was also found significant during the same period 2002 - 2013. Finally the results from a Granger causality test concluded that there is a relationship between the returns on the Dividend Plus index and the ALSI, effectively proving the existence of the dividend yield effect on the JSE between 2006 and 2013. Additionally, the anomalies found imply the opportunity for investors to make returns above buy-and-hold.
- Full Text:
- Date Issued: 2015
An analysis of use of cloud enterprise resource planning systems in South Africa
- Authors: Atukwase, Denise
- Date: 2015
- Subjects: Enterprise resource planning -- South Africa , Business planning -- South Africa , Management information systems -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8874 , http://hdl.handle.net/10948/d1020352
- Description: Due to innovation, Information Technology (IT) is changing all the time. One of the fast growing IT innovations is cloud computing. The phenomenon of cloud computing has changed the way that business consumes IT and in particular Enterprise Resource Planning (ERP) systems. This phenomenon has led to a need for research in the field of cloud ERP systems. A review of the literature revealed a gap in research related to cloud ERP systems and particularly to the adoption of these systems in South African companies. Only a few studies have been done regarding the adoption of cloud computing in South Africa, and the extent of adoption of cloud ERP systems in South Africa is not known. This study set out to answer the research question “What is the extent of understanding and adoption of ERP system in South African companies?” The study will be useful to the ERP industry in understanding the level of adoption of and perceptions about cloud ERP systems by South African companies. In order to answer the research question a survey research strategy was adopted and was of an exploratory nature. The sample was composed of IT professionals and line managers in South African companies. Questionnaires were sent via web link and 41 complete responses were obtained. The results showed that the respondents had a good understanding of the advantages/benefits of cloud ERP systems. However, a lack of clear understanding of the disadvantages/drawbacks of cloud ERP systems was evident in the research data which could lead to non-adoption of cloud ERP systems. Adoption of cloud ERP systems was highest in the engineering, manufacturing and IT sector. It was evident that IaaS and PaaS have not been adopted at all. The majority of the companies (60 percent) that had adopted cloud ERP systems were SMEs. This is in line with international studies that show that SMEs are driving the change in IT innovation such as cloud ERP systems.
- Full Text:
- Date Issued: 2015
- Authors: Atukwase, Denise
- Date: 2015
- Subjects: Enterprise resource planning -- South Africa , Business planning -- South Africa , Management information systems -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8874 , http://hdl.handle.net/10948/d1020352
- Description: Due to innovation, Information Technology (IT) is changing all the time. One of the fast growing IT innovations is cloud computing. The phenomenon of cloud computing has changed the way that business consumes IT and in particular Enterprise Resource Planning (ERP) systems. This phenomenon has led to a need for research in the field of cloud ERP systems. A review of the literature revealed a gap in research related to cloud ERP systems and particularly to the adoption of these systems in South African companies. Only a few studies have been done regarding the adoption of cloud computing in South Africa, and the extent of adoption of cloud ERP systems in South Africa is not known. This study set out to answer the research question “What is the extent of understanding and adoption of ERP system in South African companies?” The study will be useful to the ERP industry in understanding the level of adoption of and perceptions about cloud ERP systems by South African companies. In order to answer the research question a survey research strategy was adopted and was of an exploratory nature. The sample was composed of IT professionals and line managers in South African companies. Questionnaires were sent via web link and 41 complete responses were obtained. The results showed that the respondents had a good understanding of the advantages/benefits of cloud ERP systems. However, a lack of clear understanding of the disadvantages/drawbacks of cloud ERP systems was evident in the research data which could lead to non-adoption of cloud ERP systems. Adoption of cloud ERP systems was highest in the engineering, manufacturing and IT sector. It was evident that IaaS and PaaS have not been adopted at all. The majority of the companies (60 percent) that had adopted cloud ERP systems were SMEs. This is in line with international studies that show that SMEs are driving the change in IT innovation such as cloud ERP systems.
- Full Text:
- Date Issued: 2015
Isolation, characterisation of terpenoids and biosynthesis of silver nanoparticles of acacia mearnsii de wild and acacia Karroo Hayne and their Bioassays
- Authors: Avoseh, Opeyemi Nudewhenu
- Date: 2015
- Language: English
- Type: Thesis , Doctoral , PhD (Chemistry)
- Identifier: vital:11355 , http://hdl.handle.net/10353/d1021292
- Description: Great wealth of traditional knowledge about the use of plants had been transferred from generation to generations leading to the present day drug discovery and invention of new scientific methods of isolation, purification and identification. With the discovery of new diseases and drug-resistant organisms, there is no other source or deposit of lead compounds or drugs than the plant kingdom. As a result of this, about 25% of the current drug administered owe their origin to plant sources with the view to reduce the carcinogenic effect of synthetic drugs. Volatile terpenoids among other broad spectrum of natural product had been implicated to show high therapeutic properly. In the present study, selected locally-used medicinal plants were exploited for the presence of potent bioactive compounds and ability to form nanoparticles with distinctive property for use as chemoprotective agent against inflammation, tumors, cancer and other chronic diseases. Acacia mearnsii De Wild and Acacia karroo Hayne studied in this report are known to be invasive species with no proper regulation to conserve and preserve them. However, ethnopharmacology report of these plant species in the Southern Africa region reveals that they are good antiseptic, anti-diarrhea, anti-inflammation and a forage for livestock. These plants were subjected to volatile extraction protocol of some parts of the plants (stem and leaves) followed by examination of the anti-inflammation capacity of the extracts using an animal model. In addition, the bye-product (hydrosol) from the stem bark of each species possess a high reducing and stabilizing property leading to synthesis of silver nanoparticles, followed by investigation of the anti-inflammation potential of the synthesized silver nanoparticles using animal model. The volatile oils of the leaves and stem bark of Acacia mearnsii De Wild obtained by hydro-distillation were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). Twenty, Thirty-Eight, Twenty-nine and Thirty-Eight components accounting for 93.8%, 92.1%, 78.5% and 90.9% of the total oils of the fresh, dry leaves and fresh, dry stem bark respectively. The major components of the oil were octadecyl alcohol (25.5%) and phytol (10.5%); cis-verbenol (29.5%); phytol (10.1%) and phytol (23.4%) for the fresh leaves, dried leaves, and fresh stem, dry stem bark respectively. Oral administration of essential oils at the dose of 2% showed significant (p<0.05) anti-inflammatory properties in the albumin induced test model in rats. Oils from the fresh leaves and dry stems inhibited inflammation beyond 4 h post treatment. Furthermore, the chemical composition of the essential oils obtained by hydro-distillation from the leaves and stem bark (dry and fresh) of Acacia karroo Hayne, analysed by GC-MS, shows that hexanal (10.67%) and ß-ionone (9.74%) were dominant in the dried leaves, β-pinene (14.30%), and (Z)-2-Hexen-1-ol (10.21%) in the fresh leaves while Octacosane (10.59%) and phytol (23.38%) were dominant in the dry and fresh stem respectively. The anti-inflammation ability of these oils after an albumin-induced inflammation on wistar rats, shows a significant effect at the 1st h of treatment with a significance of P< 0.01 for all part plants, while the fresh leaves shows further inhibitory activities at the 2nd h of analysis. Silver nanoparticles (AgNPs) were successfully synthesized from AgNO3 through a green route using the aqueous extract (hydrosols) of Acacia mearnsii De Wild and Acacia karroo Hayne as reducing agent and as well as capping agent. The Acacia-mediated AgNPs were characterized with the use of UV-vis absorption spectroscopy, Fourier Transform Spectroscopy (FT-IR), Transmission electron microscope (TEM), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDX), and X-ray Diffractometry (XRD). A spherical, 10-40 nm diameter silver nanoparticles were synthesized with very low level of stability for the AMDS and the AKDS-AgNPs. In addition, nociceptive activity with a mice rat reveals higher inhibition at the neurogenic phase for the AKDS-AgNPs, while AMDS-AgNPs exhibited a high inhibition at the inflammatory phase. The potent anti-inflammatory activity of essential oils of A. mearnsii De Wild and A. karroo Hayne hereby confirmed its traditional use in treating various inflammatory diseases, while the inflammatory studies on the synthesized AgNPs reveals a very active compound which can be used as a potent opioid or non-steroidal anti-inflammatory drug (NSAID).
- Full Text:
- Date Issued: 2015
- Authors: Avoseh, Opeyemi Nudewhenu
- Date: 2015
- Language: English
- Type: Thesis , Doctoral , PhD (Chemistry)
- Identifier: vital:11355 , http://hdl.handle.net/10353/d1021292
- Description: Great wealth of traditional knowledge about the use of plants had been transferred from generation to generations leading to the present day drug discovery and invention of new scientific methods of isolation, purification and identification. With the discovery of new diseases and drug-resistant organisms, there is no other source or deposit of lead compounds or drugs than the plant kingdom. As a result of this, about 25% of the current drug administered owe their origin to plant sources with the view to reduce the carcinogenic effect of synthetic drugs. Volatile terpenoids among other broad spectrum of natural product had been implicated to show high therapeutic properly. In the present study, selected locally-used medicinal plants were exploited for the presence of potent bioactive compounds and ability to form nanoparticles with distinctive property for use as chemoprotective agent against inflammation, tumors, cancer and other chronic diseases. Acacia mearnsii De Wild and Acacia karroo Hayne studied in this report are known to be invasive species with no proper regulation to conserve and preserve them. However, ethnopharmacology report of these plant species in the Southern Africa region reveals that they are good antiseptic, anti-diarrhea, anti-inflammation and a forage for livestock. These plants were subjected to volatile extraction protocol of some parts of the plants (stem and leaves) followed by examination of the anti-inflammation capacity of the extracts using an animal model. In addition, the bye-product (hydrosol) from the stem bark of each species possess a high reducing and stabilizing property leading to synthesis of silver nanoparticles, followed by investigation of the anti-inflammation potential of the synthesized silver nanoparticles using animal model. The volatile oils of the leaves and stem bark of Acacia mearnsii De Wild obtained by hydro-distillation were analyzed by Gas Chromatography-Mass Spectrometry (GC-MS). Twenty, Thirty-Eight, Twenty-nine and Thirty-Eight components accounting for 93.8%, 92.1%, 78.5% and 90.9% of the total oils of the fresh, dry leaves and fresh, dry stem bark respectively. The major components of the oil were octadecyl alcohol (25.5%) and phytol (10.5%); cis-verbenol (29.5%); phytol (10.1%) and phytol (23.4%) for the fresh leaves, dried leaves, and fresh stem, dry stem bark respectively. Oral administration of essential oils at the dose of 2% showed significant (p<0.05) anti-inflammatory properties in the albumin induced test model in rats. Oils from the fresh leaves and dry stems inhibited inflammation beyond 4 h post treatment. Furthermore, the chemical composition of the essential oils obtained by hydro-distillation from the leaves and stem bark (dry and fresh) of Acacia karroo Hayne, analysed by GC-MS, shows that hexanal (10.67%) and ß-ionone (9.74%) were dominant in the dried leaves, β-pinene (14.30%), and (Z)-2-Hexen-1-ol (10.21%) in the fresh leaves while Octacosane (10.59%) and phytol (23.38%) were dominant in the dry and fresh stem respectively. The anti-inflammation ability of these oils after an albumin-induced inflammation on wistar rats, shows a significant effect at the 1st h of treatment with a significance of P< 0.01 for all part plants, while the fresh leaves shows further inhibitory activities at the 2nd h of analysis. Silver nanoparticles (AgNPs) were successfully synthesized from AgNO3 through a green route using the aqueous extract (hydrosols) of Acacia mearnsii De Wild and Acacia karroo Hayne as reducing agent and as well as capping agent. The Acacia-mediated AgNPs were characterized with the use of UV-vis absorption spectroscopy, Fourier Transform Spectroscopy (FT-IR), Transmission electron microscope (TEM), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDX), and X-ray Diffractometry (XRD). A spherical, 10-40 nm diameter silver nanoparticles were synthesized with very low level of stability for the AMDS and the AKDS-AgNPs. In addition, nociceptive activity with a mice rat reveals higher inhibition at the neurogenic phase for the AKDS-AgNPs, while AMDS-AgNPs exhibited a high inhibition at the inflammatory phase. The potent anti-inflammatory activity of essential oils of A. mearnsii De Wild and A. karroo Hayne hereby confirmed its traditional use in treating various inflammatory diseases, while the inflammatory studies on the synthesized AgNPs reveals a very active compound which can be used as a potent opioid or non-steroidal anti-inflammatory drug (NSAID).
- Full Text:
- Date Issued: 2015
Guarded visions: walls, watchtowers and warped perspectives in the Israeli occupied West Bank Palestinian territory
- Authors: Baasch, Rachel M
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147281 , vital:38611 , https://0-hdl.handle.net.wam.seals.ac.za/10520/EJC176318
- Description: This paper examines the relationship between Israel's fortification of physical space and narratives of division in the Israeli occupied Palestinian West Bank Territory. I argue that the fortification and separation of physical space deepens segregation, and increases fear, hostility and disconnection between people living in this context. Furthermore, I suggest that this relationship between narratives of division and insecurity and structural mechanisms of control within the West Bank influences and impacts on individuals such that personal perspectives become guarded and defensive. The mediation of subjects through a defensive lens can prevent individuals from forming connections that acknowledge the permeability of seemingly impenetrable distinctions between inside and outside, or self and an-other. The looking, recording and representation of people in a place that is guarded and framed from a position of insecurity reduces the capacity of individuals to locate openings that traverse restrictive boundaries. In order to contextualise my discussion, I have included personal documentation of defensive structures photographed in the West Bank between 2013 and 2014. I position my observations and analyses in relation to discussions about the Oush Grab Military Base presented by the Decolonizing Architecture Art Residency (DAAR) in their recent publication Architecture after revolution (2013).
- Full Text:
- Date Issued: 2015
- Authors: Baasch, Rachel M
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147281 , vital:38611 , https://0-hdl.handle.net.wam.seals.ac.za/10520/EJC176318
- Description: This paper examines the relationship between Israel's fortification of physical space and narratives of division in the Israeli occupied Palestinian West Bank Territory. I argue that the fortification and separation of physical space deepens segregation, and increases fear, hostility and disconnection between people living in this context. Furthermore, I suggest that this relationship between narratives of division and insecurity and structural mechanisms of control within the West Bank influences and impacts on individuals such that personal perspectives become guarded and defensive. The mediation of subjects through a defensive lens can prevent individuals from forming connections that acknowledge the permeability of seemingly impenetrable distinctions between inside and outside, or self and an-other. The looking, recording and representation of people in a place that is guarded and framed from a position of insecurity reduces the capacity of individuals to locate openings that traverse restrictive boundaries. In order to contextualise my discussion, I have included personal documentation of defensive structures photographed in the West Bank between 2013 and 2014. I position my observations and analyses in relation to discussions about the Oush Grab Military Base presented by the Decolonizing Architecture Art Residency (DAAR) in their recent publication Architecture after revolution (2013).
- Full Text:
- Date Issued: 2015
Survival of women in law enforcement
- Authors: Badi, Yvonne Tankiso
- Date: 2015
- Subjects: Policewomen -- South Africa -- Eastern Cape , Women police chiefs -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8860 , http://hdl.handle.net/10948/d1020179
- Description: This study seeks to investigate the underlying ideologies and practices behind the perception that women who are in command positions are unable to command and control, especially those who are in the operational environment. The study was executed in the Eastern Cape Province (Eastern Cape), in Buffalo City Metropolitan Municipality (BCM). The research participants (respondents) were constituted by 33 police officers from diverse police stations within the BCM. The participants were divided according to gender, i.e. 24 females and 9 males. With regards to objectives of the study, the aim was to investigate the following issues: i) to understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinateslcolleagues and community members. ii) To understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinates/colleagues and community members, and iii) to explore strategies to utilize in making SAPS' women operational commanders, survive while managing their day-te-day respective units/components effectively and efficiently. Regarding research design, this study mainly used a qualitative research method combined with a bit of a quantitative approach. And then the data collection method involved making use of semi structured interviews to all the respondents. The results of this study show that there is still a huge difference in the number of women who are commanders compared to their male counterparts, especially in those environments that were previously regarded as male dominated. Further, despite the necessary training being provided by the SAPS to women officers, the necessary support in particular from management is still a challenge. Lastly, the argument of this study is that there is still not a fair representation of women in command positions within the SAPS, especially, in the previously male dominated environments.
- Full Text:
- Date Issued: 2015
- Authors: Badi, Yvonne Tankiso
- Date: 2015
- Subjects: Policewomen -- South Africa -- Eastern Cape , Women police chiefs -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8860 , http://hdl.handle.net/10948/d1020179
- Description: This study seeks to investigate the underlying ideologies and practices behind the perception that women who are in command positions are unable to command and control, especially those who are in the operational environment. The study was executed in the Eastern Cape Province (Eastern Cape), in Buffalo City Metropolitan Municipality (BCM). The research participants (respondents) were constituted by 33 police officers from diverse police stations within the BCM. The participants were divided according to gender, i.e. 24 females and 9 males. With regards to objectives of the study, the aim was to investigate the following issues: i) to understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinateslcolleagues and community members. ii) To understand factors that make women not to be accepted in their positions as SAPS' operational commanders, by their male subordinates/colleagues and community members, and iii) to explore strategies to utilize in making SAPS' women operational commanders, survive while managing their day-te-day respective units/components effectively and efficiently. Regarding research design, this study mainly used a qualitative research method combined with a bit of a quantitative approach. And then the data collection method involved making use of semi structured interviews to all the respondents. The results of this study show that there is still a huge difference in the number of women who are commanders compared to their male counterparts, especially in those environments that were previously regarded as male dominated. Further, despite the necessary training being provided by the SAPS to women officers, the necessary support in particular from management is still a challenge. Lastly, the argument of this study is that there is still not a fair representation of women in command positions within the SAPS, especially, in the previously male dominated environments.
- Full Text:
- Date Issued: 2015
Regolith mapping and gold geochemical anomalies in the Siguiri Gold Mine of AngloGold Ashanti, Guinea, West Africa
- Authors: Bah, Boubacar
- Date: 2015
- Subjects: AngloGold Ashanti Ltd. , Regolith -- Guinea -- Siguiri (Region) , Gold mines and mining -- Guinea -- Siguiri (Region) , Geochemical surveys -- Guinea -- Siguiri (Region) , Soil surveys -- Geochemical methods -- Guinea -- Siguiri (Region) , Kriging
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5090 , http://hdl.handle.net/10962/d1019878
- Description: Gold exploration in the laterite terrains of the Siguiri basin (Guinea-West Africa) is discussed in this thesis. It seeks to propose and develop effective and reliable geochemical exploration techniques applied in such laterite terrains. The study is also intended to investigate and provide some geological clues as to why, in some target areas, the reconnaissance test drilling across the geochemical anomalies couldn’t intersect economic gold mineralisation. Targets were generated based on soil geochemical results, some of which were drilled without delivering economic discoveries even on areas with strong and consistent geochemical signatures. To find the failure and define the appropriate methods to be used is the core of the thesis. More importantly, the geological observation is aimed at sourcing and establishing the nature and validity of geochemical anomalies within the license area and their relationship with the underlying lithologies and structural networks. The geological field work conducted during this study is mostly based on regolith and surface geological mapping. The thick laterite cover, deep weathering, bedrock geology, gold geochemistry (the gold geochemical anomalous results are defined according to historical data before 2007), soil formations and variations in climate conditions are emphasized to illustrate the importance of mineral element mobility and dispersion in the weathering profiles. The knowledge and experience in regolith geochemistry and regolith mapping provide the advantage to exploration geologists. The depletion of ore resources and reserves in Siguiri and the continuous decline of the gold price in comparison to the complexity of exploring for gold are demanding more scientific-related thoughts and techniques to be integrated in the available geological, geochemical and geophysical information so as to reduce costs. The integration of good exploration strategy and technique may result in the possibility of making viable discoveries in this highly competitive geological environment where the mineral resources become depleted every day.
- Full Text:
- Date Issued: 2015
- Authors: Bah, Boubacar
- Date: 2015
- Subjects: AngloGold Ashanti Ltd. , Regolith -- Guinea -- Siguiri (Region) , Gold mines and mining -- Guinea -- Siguiri (Region) , Geochemical surveys -- Guinea -- Siguiri (Region) , Soil surveys -- Geochemical methods -- Guinea -- Siguiri (Region) , Kriging
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5090 , http://hdl.handle.net/10962/d1019878
- Description: Gold exploration in the laterite terrains of the Siguiri basin (Guinea-West Africa) is discussed in this thesis. It seeks to propose and develop effective and reliable geochemical exploration techniques applied in such laterite terrains. The study is also intended to investigate and provide some geological clues as to why, in some target areas, the reconnaissance test drilling across the geochemical anomalies couldn’t intersect economic gold mineralisation. Targets were generated based on soil geochemical results, some of which were drilled without delivering economic discoveries even on areas with strong and consistent geochemical signatures. To find the failure and define the appropriate methods to be used is the core of the thesis. More importantly, the geological observation is aimed at sourcing and establishing the nature and validity of geochemical anomalies within the license area and their relationship with the underlying lithologies and structural networks. The geological field work conducted during this study is mostly based on regolith and surface geological mapping. The thick laterite cover, deep weathering, bedrock geology, gold geochemistry (the gold geochemical anomalous results are defined according to historical data before 2007), soil formations and variations in climate conditions are emphasized to illustrate the importance of mineral element mobility and dispersion in the weathering profiles. The knowledge and experience in regolith geochemistry and regolith mapping provide the advantage to exploration geologists. The depletion of ore resources and reserves in Siguiri and the continuous decline of the gold price in comparison to the complexity of exploring for gold are demanding more scientific-related thoughts and techniques to be integrated in the available geological, geochemical and geophysical information so as to reduce costs. The integration of good exploration strategy and technique may result in the possibility of making viable discoveries in this highly competitive geological environment where the mineral resources become depleted every day.
- Full Text:
- Date Issued: 2015
Hsp70/Hsp90 organising protein (hop): beyond interactions with chaperones and prion proteins
- Baindur-Hudson, Swati, Edkins, Adrienne L, Blatch, Gregory L
- Authors: Baindur-Hudson, Swati , Edkins, Adrienne L , Blatch, Gregory L
- Date: 2015
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/164852 , vital:41178 , ISBN 978-3-319-11730-0 , DOI: 10.1007/978-3-319-11731-7_3
- Description: The Hsp70/Hsp90 organising protein (Hop), also known as stress-inducible protein 1 (STI1), has received considerable attention for diverse cellular functions in both healthy and diseased states. There is extensive evidence that intracellular Hop is a co-chaperone of the major chaperones Hsp70 and Hsp90, playing an important role in the productive folding of Hsp90 client proteins. Consequently, Hop is implicated in a number of key signalling pathways, including aberrant pathways leading to cancer. However, Hop is also secreted and it is now well established that Hop also serves as a receptor for the prion protein, PrPC.
- Full Text:
- Date Issued: 2015
- Authors: Baindur-Hudson, Swati , Edkins, Adrienne L , Blatch, Gregory L
- Date: 2015
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/164852 , vital:41178 , ISBN 978-3-319-11730-0 , DOI: 10.1007/978-3-319-11731-7_3
- Description: The Hsp70/Hsp90 organising protein (Hop), also known as stress-inducible protein 1 (STI1), has received considerable attention for diverse cellular functions in both healthy and diseased states. There is extensive evidence that intracellular Hop is a co-chaperone of the major chaperones Hsp70 and Hsp90, playing an important role in the productive folding of Hsp90 client proteins. Consequently, Hop is implicated in a number of key signalling pathways, including aberrant pathways leading to cancer. However, Hop is also secreted and it is now well established that Hop also serves as a receptor for the prion protein, PrPC.
- Full Text:
- Date Issued: 2015
Geological and geophysical investigation of the South Eastern Karoo Basin, South Africa
- Authors: Baiyegunhi, Christopher
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc (Geology)
- Identifier: vital:11532 , http://hdl.handle.net/10353/d1021280
- Description: Geological and geophysical methods were used to investigate the southeastern Karoo Basin of South Africa in an area extending from longitudes 24 o E to 29o E and latitudes 32o S to 35o S. This was undertaken in order to reveal geologic structures, isochore thicknesses of the geologic sequence and their variations across the study area, proffer the possible provenance of the sediments and assess the potential of oil and gas accumulation. The methodology used includes field investigation, rock sampling, preparation of thin sections, petrographic studies, X-ray diffraction analysis, density measurements, porosity calculations, extraction of elevation data from Google Earth, 2½ D gravity profile modelling, generating of isochore (true vertical) thicknesses and depositional surfaces maps from the models, PetroMod 1D modelling and qualitative interpretation of magnetic, gravity and radiometric maps.Petrographic study was carried out on twenty six thin sections of rocks from the eleven geologic formations that cover the study area. Petrographic studies on the diamictite of the Dwyka Group shows abundance of monocrystalline quartz, granite and quartzite components in the breccias which possibly indicate the existence of granitic and metamorphic rocks in the source areas. The sandstones of the Ecca and Beaufort Groups are immature, greywacke and the heavy mineral assemblages signify that the minerals are of granitic, volcanic and metamorphic origin. The magnetic maps show two main magnetic anomalies, a major one trending in a northeast to southwest direction which is part of the Beattie magnetic anomaly and another that is a “bean-shaped” anomaly. The radially averaged power spectrum shows two depths to magnetic sources. The first depth is about 0.6 km which is the average depth to the top of the shallow sources, while the average depth to the top of the deep sources is about 15 km. The shallow sources are connected to magnetic minerals within the Beaufort Group while deep magnetic sources were inferred to be in the basement. The gamma ray spectrometric map shows areas with relatively high gamma radiation count. The high radiation count is possibly due to the uranium and thorium in the detrital materials, as well as the enrichment of radioelements in the feldspars (k-feldspar), calcite, quartz, zircon and clay minerals in the fluvial channel sandstones of the Beaufort Group. A total of two hundred and fifty-eight (258) rock samples were collected in the field and densities (dry, wet and grain densities) and porosities were determined in the laboratory. The Karoo Supergroup density values range from 2.526 – 2.828 g/cm3. The average porosities range from 0. 49 – 3.31 %. The dry densities and porosities of all the formations are inversely correlated with correlation coefficient values (R) that range from 0.9491 - 0.9982. The density of the dolerite intrusions (mostly sill) ranges from 2.700 – 2.837 g/cm3 whilst the porosity range from 0.1118 – 0.3868 %. The Bouguer anomaly map shows an increase in gravity values from -140.7 mGal in inland to about 60.1 mGal in coastal areas. This dominant gravity variation is inferred to be due to a deeper basement and/or Moho that get shallower from inland towards the coast. The Moho is at about 45 km depth inland and shallows to about 42 km at the coast. The 2½ D gravity modelling was done for fourteen (14) profiles with each profile having three (3) models corresponding to minimum, average and maximum densities to obtain the thicknesses of the geologic sequence. The current isochore thicknesses extracted from the gravity models show that the Beaufort Group is the thickest of all the groups that make up the Karoo Supergroup with maximum vertical thickness of up to 634 m, followed by the Ecca and Dwyka Groups with maximum vertical thicknesses of about 3207 m and 727 m, respectively. The maximum elevation for the Dwyka, Ecca and Beaufort sediments are about 500 m, 400 m and 285 m, respectively, whilst the maximum depth below sea level are around 8500 m, 7000 m and 5500 m, respectively. The PetroMod1D model result yield average vitrinite reflectance and temperature values of about 6 % and 500 ℃ respectively for the lower Ecca Group which belong to the dry gas window based on classification by several authors. Thus the rocks of the lower Ecca Group are thermally matured for hydrocarbon (shale gas) generation that can merit gas exploration in the Karoo Basin.
- Full Text:
- Date Issued: 2015
- Authors: Baiyegunhi, Christopher
- Date: 2015
- Language: English
- Type: Thesis , Masters , MSc (Geology)
- Identifier: vital:11532 , http://hdl.handle.net/10353/d1021280
- Description: Geological and geophysical methods were used to investigate the southeastern Karoo Basin of South Africa in an area extending from longitudes 24 o E to 29o E and latitudes 32o S to 35o S. This was undertaken in order to reveal geologic structures, isochore thicknesses of the geologic sequence and their variations across the study area, proffer the possible provenance of the sediments and assess the potential of oil and gas accumulation. The methodology used includes field investigation, rock sampling, preparation of thin sections, petrographic studies, X-ray diffraction analysis, density measurements, porosity calculations, extraction of elevation data from Google Earth, 2½ D gravity profile modelling, generating of isochore (true vertical) thicknesses and depositional surfaces maps from the models, PetroMod 1D modelling and qualitative interpretation of magnetic, gravity and radiometric maps.Petrographic study was carried out on twenty six thin sections of rocks from the eleven geologic formations that cover the study area. Petrographic studies on the diamictite of the Dwyka Group shows abundance of monocrystalline quartz, granite and quartzite components in the breccias which possibly indicate the existence of granitic and metamorphic rocks in the source areas. The sandstones of the Ecca and Beaufort Groups are immature, greywacke and the heavy mineral assemblages signify that the minerals are of granitic, volcanic and metamorphic origin. The magnetic maps show two main magnetic anomalies, a major one trending in a northeast to southwest direction which is part of the Beattie magnetic anomaly and another that is a “bean-shaped” anomaly. The radially averaged power spectrum shows two depths to magnetic sources. The first depth is about 0.6 km which is the average depth to the top of the shallow sources, while the average depth to the top of the deep sources is about 15 km. The shallow sources are connected to magnetic minerals within the Beaufort Group while deep magnetic sources were inferred to be in the basement. The gamma ray spectrometric map shows areas with relatively high gamma radiation count. The high radiation count is possibly due to the uranium and thorium in the detrital materials, as well as the enrichment of radioelements in the feldspars (k-feldspar), calcite, quartz, zircon and clay minerals in the fluvial channel sandstones of the Beaufort Group. A total of two hundred and fifty-eight (258) rock samples were collected in the field and densities (dry, wet and grain densities) and porosities were determined in the laboratory. The Karoo Supergroup density values range from 2.526 – 2.828 g/cm3. The average porosities range from 0. 49 – 3.31 %. The dry densities and porosities of all the formations are inversely correlated with correlation coefficient values (R) that range from 0.9491 - 0.9982. The density of the dolerite intrusions (mostly sill) ranges from 2.700 – 2.837 g/cm3 whilst the porosity range from 0.1118 – 0.3868 %. The Bouguer anomaly map shows an increase in gravity values from -140.7 mGal in inland to about 60.1 mGal in coastal areas. This dominant gravity variation is inferred to be due to a deeper basement and/or Moho that get shallower from inland towards the coast. The Moho is at about 45 km depth inland and shallows to about 42 km at the coast. The 2½ D gravity modelling was done for fourteen (14) profiles with each profile having three (3) models corresponding to minimum, average and maximum densities to obtain the thicknesses of the geologic sequence. The current isochore thicknesses extracted from the gravity models show that the Beaufort Group is the thickest of all the groups that make up the Karoo Supergroup with maximum vertical thickness of up to 634 m, followed by the Ecca and Dwyka Groups with maximum vertical thicknesses of about 3207 m and 727 m, respectively. The maximum elevation for the Dwyka, Ecca and Beaufort sediments are about 500 m, 400 m and 285 m, respectively, whilst the maximum depth below sea level are around 8500 m, 7000 m and 5500 m, respectively. The PetroMod1D model result yield average vitrinite reflectance and temperature values of about 6 % and 500 ℃ respectively for the lower Ecca Group which belong to the dry gas window based on classification by several authors. Thus the rocks of the lower Ecca Group are thermally matured for hydrocarbon (shale gas) generation that can merit gas exploration in the Karoo Basin.
- Full Text:
- Date Issued: 2015
Inkblots and their indices: rethreading perception in the work of Igshaan Adams
- Authors: Ball, Jennifer
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147293 , vital:38612 , https://0-hdl.handle.net.wam.seals.ac.za/10520/EJC176316
- Description: Igshaan Adams is a young artist from Cape Town, working in multimedia and performance. In his practice, Adams brings ways of seeing and also ways of being into consideration through meditations on objects, dreams, Sufism, family relationships and the changeability of self-hood through perception of these phenomena. This paper engages with Adams' affinity with objects, their agency and biography,and considers how his sensitive interventions alter their materiality, shifting the ways in which they can be seen. The ways in which Adams' family relationships play out in the processes of making his sculptural works, and also in his performances, are then elucidated and related to his ongoing processes of self-enquiry. Furthermore, I consider Adams' latest body of work, a critical enquiry into the variable meanings of Rorschach inkblots. Adams reflects on the grounds for inkblot testing and, in so doing, tests and measures the nature of looking, perceiving and projecting.
- Full Text:
- Date Issued: 2015
- Authors: Ball, Jennifer
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147293 , vital:38612 , https://0-hdl.handle.net.wam.seals.ac.za/10520/EJC176316
- Description: Igshaan Adams is a young artist from Cape Town, working in multimedia and performance. In his practice, Adams brings ways of seeing and also ways of being into consideration through meditations on objects, dreams, Sufism, family relationships and the changeability of self-hood through perception of these phenomena. This paper engages with Adams' affinity with objects, their agency and biography,and considers how his sensitive interventions alter their materiality, shifting the ways in which they can be seen. The ways in which Adams' family relationships play out in the processes of making his sculptural works, and also in his performances, are then elucidated and related to his ongoing processes of self-enquiry. Furthermore, I consider Adams' latest body of work, a critical enquiry into the variable meanings of Rorschach inkblots. Adams reflects on the grounds for inkblot testing and, in so doing, tests and measures the nature of looking, perceiving and projecting.
- Full Text:
- Date Issued: 2015
Beneficiary perceptions of a low income housing scheme: Mdantsane township
- Authors: Bandile, Unathi Cordelia
- Date: 2015
- Subjects: Low-income housing -- South Africa -- Eastern Cape , Public housing -- South Africa -- Eastern Cape , Housing development -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9719 , http://hdl.handle.net/10948/d1021137
- Description: The aim of this study was to investigate the socio-economic perceptions of the beneficiaries of the low income housing scheme in Unit P, of Mdantsane Township, under Buffalo City Metropolitan Municipality. Both quantitative and qualitative approaches were utilised in this study. For instance, questionnaires on the perceptions were administered amongst twenty (20) beneficiaries of this low housing scheme. Semi structured interviews were conducted amongst five (5) respondents who participated in the survey design. The study found that the intervention of providing poor people with houses was not appropriately done as these houses are too small and therefore fail to consider the families of the beneficiaries although the South African government seems to have succeeded to some extent in providing low income housing for the unemployed and those that belong to the low income category. The study also found that the location of Unit P poses a threat because it is located away from all the amenities compelling the beneficiaries to travel more than 5km to the amenities and essential services. The study therefore recommends that the government employs competent contractors that would do a proper job. State officials, tasked with overseeing the various state funded housing projects, have to ascertain the success of these projects by making sure that the contractors do not lack skills such as the ability to facilitate projects of a high magnitude as that could lead to flawed projects. They should be constantly monitored and post evaluated. This will help to minimize the wasting of state resources.
- Full Text:
- Date Issued: 2015
- Authors: Bandile, Unathi Cordelia
- Date: 2015
- Subjects: Low-income housing -- South Africa -- Eastern Cape , Public housing -- South Africa -- Eastern Cape , Housing development -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9719 , http://hdl.handle.net/10948/d1021137
- Description: The aim of this study was to investigate the socio-economic perceptions of the beneficiaries of the low income housing scheme in Unit P, of Mdantsane Township, under Buffalo City Metropolitan Municipality. Both quantitative and qualitative approaches were utilised in this study. For instance, questionnaires on the perceptions were administered amongst twenty (20) beneficiaries of this low housing scheme. Semi structured interviews were conducted amongst five (5) respondents who participated in the survey design. The study found that the intervention of providing poor people with houses was not appropriately done as these houses are too small and therefore fail to consider the families of the beneficiaries although the South African government seems to have succeeded to some extent in providing low income housing for the unemployed and those that belong to the low income category. The study also found that the location of Unit P poses a threat because it is located away from all the amenities compelling the beneficiaries to travel more than 5km to the amenities and essential services. The study therefore recommends that the government employs competent contractors that would do a proper job. State officials, tasked with overseeing the various state funded housing projects, have to ascertain the success of these projects by making sure that the contractors do not lack skills such as the ability to facilitate projects of a high magnitude as that could lead to flawed projects. They should be constantly monitored and post evaluated. This will help to minimize the wasting of state resources.
- Full Text:
- Date Issued: 2015
Photophysical and nonlinear optical studies of tetraakynyl zincphthalocyanine and its “clicked” analogue
- Bankole, Owolabi M, Nyokong, Tebello
- Authors: Bankole, Owolabi M , Nyokong, Tebello
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/189325 , vital:44837 , xlink:href="https://doi.org/10.1016/j.molstruc.2015.01.048"
- Description: We report here for the first time on the photophysical and nonlinear optical behavior of tetra-substituted alkynyl zinc phthalocyanine and its “clicked” analogue (4 and 5). The compounds exhibited high triplet quantum yields in dimethylsulphoxide (DMSO). Nonlinear optical (NLO) properties were also evaluated for the two compounds at 532 nm and 10 ns in DMSO. We observed two-photon absorption (2PA) and strong reverse saturable absorption (RSA) as the dominant mechanisms at nanosecond laser excitation. The presence of electron acceptor groups fused with triazole linkers in the peripheral positions of 4 provide excellent coexistent features, such as enhanced triplet quantum yields and lifetimes compared to 5. Large third-order susceptibility (2.09 × 10−11 and 3.53 × 10−9 esu) and hyperpolarizability (1.09 × 10−30 and 9.13 × 10−29 esu) were estimated for complexs 4 and 5, respectively.
- Full Text:
- Date Issued: 2015
- Authors: Bankole, Owolabi M , Nyokong, Tebello
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/189325 , vital:44837 , xlink:href="https://doi.org/10.1016/j.molstruc.2015.01.048"
- Description: We report here for the first time on the photophysical and nonlinear optical behavior of tetra-substituted alkynyl zinc phthalocyanine and its “clicked” analogue (4 and 5). The compounds exhibited high triplet quantum yields in dimethylsulphoxide (DMSO). Nonlinear optical (NLO) properties were also evaluated for the two compounds at 532 nm and 10 ns in DMSO. We observed two-photon absorption (2PA) and strong reverse saturable absorption (RSA) as the dominant mechanisms at nanosecond laser excitation. The presence of electron acceptor groups fused with triazole linkers in the peripheral positions of 4 provide excellent coexistent features, such as enhanced triplet quantum yields and lifetimes compared to 5. Large third-order susceptibility (2.09 × 10−11 and 3.53 × 10−9 esu) and hyperpolarizability (1.09 × 10−30 and 9.13 × 10−29 esu) were estimated for complexs 4 and 5, respectively.
- Full Text:
- Date Issued: 2015
Photophysical and non-linear optical behavior of novel tetra alkynyl terminated indium phthalocyanines: Effects of the carbon chain length
- Bankole, Owolabi M, Britton, Jonathan, Nyokong, Tebello
- Authors: Bankole, Owolabi M , Britton, Jonathan , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7262 , http://hdl.handle.net/10962/d1020271
- Description: We report on the synthesis, photophysical and nonlinear optical behavior of tetra-substituted alkynyl indium phthalocyanine complexes (3a and 3b). Both complexes showed large triplet quantum yields. Nonlinear optical properties were also evaluated for the two complexes at a wavelength of 532 nm using nanosecond Z-scan technique in dimethylsulfoxide. We observed two-photon absorption (2PA) and strong reverse saturable absorption (RSA) as the dominant mechanisms at nanosecond laser excitation. The underlining 2PA and observed RSA were subjected to further scrutiny by comparing the analytical absorption model to the transmittance optical absorption theory. The theoretical results were in good agreement to the observed RSA and the 2PA mechanism. Large two-photon absorption cross-section (1.29 × 10−42 and 1.15 × 10−42 cm4 s/photon), third-order susceptibility (2.10 × 10−14 and 2.15 × 10−14 esu) and hyperpolarizability (2.70 × 10−32 and 3.19 × 10−32 esu) were estimated for complex 3a and 3b, respectively. , Original publication is available at http://dx.doi.org/10.1016/j.poly.2014.12.020
- Full Text: false
- Authors: Bankole, Owolabi M , Britton, Jonathan , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7262 , http://hdl.handle.net/10962/d1020271
- Description: We report on the synthesis, photophysical and nonlinear optical behavior of tetra-substituted alkynyl indium phthalocyanine complexes (3a and 3b). Both complexes showed large triplet quantum yields. Nonlinear optical properties were also evaluated for the two complexes at a wavelength of 532 nm using nanosecond Z-scan technique in dimethylsulfoxide. We observed two-photon absorption (2PA) and strong reverse saturable absorption (RSA) as the dominant mechanisms at nanosecond laser excitation. The underlining 2PA and observed RSA were subjected to further scrutiny by comparing the analytical absorption model to the transmittance optical absorption theory. The theoretical results were in good agreement to the observed RSA and the 2PA mechanism. Large two-photon absorption cross-section (1.29 × 10−42 and 1.15 × 10−42 cm4 s/photon), third-order susceptibility (2.10 × 10−14 and 2.15 × 10−14 esu) and hyperpolarizability (2.70 × 10−32 and 3.19 × 10−32 esu) were estimated for complex 3a and 3b, respectively. , Original publication is available at http://dx.doi.org/10.1016/j.poly.2014.12.020
- Full Text: false
Photophysical and nonlinear optical studies of tetraakynyl zincphthalocyanine and its “clicked” analogue
- Bankole, Owolabi M, Nyokong, Tebello
- Authors: Bankole, Owolabi M , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7251 , http://hdl.handle.net/10962/d1020259
- Description: We report here for the first time on the photophysical and nonlinear optical behavior of tetra-substituted alkynyl zinc phthalocyanine and its “clicked” analogue (4 and 5). The compounds exhibited high triplet quantum yields in dimethylsulphoxide (DMSO). Nonlinear optical (NLO) properties were also evaluated for the two compounds at 532 nm and 10 ns in DMSO. We observed two-photon absorption (2PA) and strong reverse saturable absorption (RSA) as the dominant mechanisms at nanosecond laser excitation. The presence of electron acceptor groups fused with triazole linkers in the peripheral positions of 4 provide excellent coexistent features, such as enhanced triplet quantum yields and lifetimes compared to 5. Large third-order susceptibility (2.09 × 10−11 and 3.53 × 10−9 esu) and hyperpolarizability (1.09 × 10−30 and 9.13 × 10−29 esu) were estimated for complexs 4 and 5, respectively. , Original publication is available at http://dx.doi.org/10.1016/j.molstruc.2015.01.048
- Full Text: false
- Authors: Bankole, Owolabi M , Nyokong, Tebello
- Language: English
- Type: Article
- Identifier: vital:7251 , http://hdl.handle.net/10962/d1020259
- Description: We report here for the first time on the photophysical and nonlinear optical behavior of tetra-substituted alkynyl zinc phthalocyanine and its “clicked” analogue (4 and 5). The compounds exhibited high triplet quantum yields in dimethylsulphoxide (DMSO). Nonlinear optical (NLO) properties were also evaluated for the two compounds at 532 nm and 10 ns in DMSO. We observed two-photon absorption (2PA) and strong reverse saturable absorption (RSA) as the dominant mechanisms at nanosecond laser excitation. The presence of electron acceptor groups fused with triazole linkers in the peripheral positions of 4 provide excellent coexistent features, such as enhanced triplet quantum yields and lifetimes compared to 5. Large third-order susceptibility (2.09 × 10−11 and 3.53 × 10−9 esu) and hyperpolarizability (1.09 × 10−30 and 9.13 × 10−29 esu) were estimated for complexs 4 and 5, respectively. , Original publication is available at http://dx.doi.org/10.1016/j.molstruc.2015.01.048
- Full Text: false
Mercaptopyridine-substituted indium, zinc, and metal-free phthalocyanines: nonlinear optical studies in solution and on polymer matrices
- Bankole, Owolabi M, Nyokong, Tebello
- Authors: Bankole, Owolabi M , Nyokong, Tebello
- Date: 2015
- Language: English
- Type: Article
- Identifier: vital:7278 , http://hdl.handle.net/10962/d1020313
- Description: In this article, the nonlinear optical characterizations and optical limiting properties of metal-free (2), zinc (3), and indium (4) tetra 4-(2-mercaptopyridine) phthalocyanines are discussed. Nonlinear optical properties of the samples were evaluated using Z-scan at 532 nm and 10 ns pulse in CHCl3, and doped on poly(bisphenol A carbonate) (PBC) thin films. Thin films for 2, 3, and 4 are represented as 2-PBC, 3-PBC, and 4-PBC, respectively. We observed two-photon absorption (2PA) and strong reverse saturable absorption as the dominant mechanisms at nanosecond laser excitation in solution and thin films. By virtue of the magnitude of absorption coefficients and other nonlinear optical parameters estimated in this work, sample 4 was found to exhibit strongest nonlinear optical properties followed by 3, while 2 is the weakest nonlinear absorber of the studied samples. Large third-order susceptibility (1.46 × 10−9 esu and 7.74 × 10−10 esu) and hyperpolarizability (2.13 × 10−28 and 8.37 × 10−29 esu) were estimated for 4-PBC and 3-PBC, respectively. Our studies show that these molecules are suitable candidates for practical passive optical limiters. , Original publication is available at http://dx.doi.org/10.1080/00958972.2015.1077237
- Full Text: false
- Date Issued: 2015
- Authors: Bankole, Owolabi M , Nyokong, Tebello
- Date: 2015
- Language: English
- Type: Article
- Identifier: vital:7278 , http://hdl.handle.net/10962/d1020313
- Description: In this article, the nonlinear optical characterizations and optical limiting properties of metal-free (2), zinc (3), and indium (4) tetra 4-(2-mercaptopyridine) phthalocyanines are discussed. Nonlinear optical properties of the samples were evaluated using Z-scan at 532 nm and 10 ns pulse in CHCl3, and doped on poly(bisphenol A carbonate) (PBC) thin films. Thin films for 2, 3, and 4 are represented as 2-PBC, 3-PBC, and 4-PBC, respectively. We observed two-photon absorption (2PA) and strong reverse saturable absorption as the dominant mechanisms at nanosecond laser excitation in solution and thin films. By virtue of the magnitude of absorption coefficients and other nonlinear optical parameters estimated in this work, sample 4 was found to exhibit strongest nonlinear optical properties followed by 3, while 2 is the weakest nonlinear absorber of the studied samples. Large third-order susceptibility (1.46 × 10−9 esu and 7.74 × 10−10 esu) and hyperpolarizability (2.13 × 10−28 and 8.37 × 10−29 esu) were estimated for 4-PBC and 3-PBC, respectively. Our studies show that these molecules are suitable candidates for practical passive optical limiters. , Original publication is available at http://dx.doi.org/10.1080/00958972.2015.1077237
- Full Text: false
- Date Issued: 2015
‘Victim’ or ‘survivor’?: language, identity and ethics revisited
- Barker, Kim, Macleod, Catriona I
- Authors: Barker, Kim , Macleod, Catriona I
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143738 , vital:38278 , https://ischp.files.wordpress.com/2015/08/ischp_2015_abstract_booklet.pdf
- Description: Initially in feminist circles, and subsequently in more common usage, the term ‘survivor’ came to signify those who have been (sexually) violated and live on, and even thrive. The passivity implied by the term ‘victim’ therefore gave way to the more agentic connotations of ‘survivor’. However, neither term adequately captures the complexity and fluidity of subject positions taken up by and ascribed to women who have been subjected to sexual violence. The selection of an inadequate word is not neutral: each identifier calls forth particular identity constructions which have real effects. Reducing women’s experiences to one pole of this simple binary can diminish and totalise those experiences. In this paper we re-consider the use of these terms with reference to research conducted with protestors participating in an annual anti-rape protest held at Rhodes University, Grahamstown, South Africa. We focus on the perspectives of women who are ‘survivors’ of sexual violence.
- Full Text:
- Date Issued: 2015
- Authors: Barker, Kim , Macleod, Catriona I
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/143738 , vital:38278 , https://ischp.files.wordpress.com/2015/08/ischp_2015_abstract_booklet.pdf
- Description: Initially in feminist circles, and subsequently in more common usage, the term ‘survivor’ came to signify those who have been (sexually) violated and live on, and even thrive. The passivity implied by the term ‘victim’ therefore gave way to the more agentic connotations of ‘survivor’. However, neither term adequately captures the complexity and fluidity of subject positions taken up by and ascribed to women who have been subjected to sexual violence. The selection of an inadequate word is not neutral: each identifier calls forth particular identity constructions which have real effects. Reducing women’s experiences to one pole of this simple binary can diminish and totalise those experiences. In this paper we re-consider the use of these terms with reference to research conducted with protestors participating in an annual anti-rape protest held at Rhodes University, Grahamstown, South Africa. We focus on the perspectives of women who are ‘survivors’ of sexual violence.
- Full Text:
- Date Issued: 2015