Observed correlations of unsolicited ip traffic across five distinct network telescopes
- Irwin, Barry V W, Nkhumeleni, T
- Authors: Irwin, Barry V W , Nkhumeleni, T
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428569 , vital:72521 , https://www.jstor.org/stable/26502727
- Description: Using network telescopes to monitor unused IP address space provides a favourable environment for researchers to study and detect malware, denial of service, and scanning activities on the Internet. This research focuses on comparative and correlation analysis of traffic activity across five IPv4 network telescopes, each with an aperture size of /24 over a 12-month period. Time series representations of the traffic activity observed on these sensors were constructed. Using the cross- and auto-correlation methods of time series analysis, sensor data was quantitatively analysed with the resulting correlation of network telescopes’ traffic activity found to be moderate to high, dependent on grouping.
- Full Text:
- Date Issued: 2015
- Authors: Irwin, Barry V W , Nkhumeleni, T
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428569 , vital:72521 , https://www.jstor.org/stable/26502727
- Description: Using network telescopes to monitor unused IP address space provides a favourable environment for researchers to study and detect malware, denial of service, and scanning activities on the Internet. This research focuses on comparative and correlation analysis of traffic activity across five IPv4 network telescopes, each with an aperture size of /24 over a 12-month period. Time series representations of the traffic activity observed on these sensors were constructed. Using the cross- and auto-correlation methods of time series analysis, sensor data was quantitatively analysed with the resulting correlation of network telescopes’ traffic activity found to be moderate to high, dependent on grouping.
- Full Text:
- Date Issued: 2015
Reinventing the oral word and returning it to the community via technauriture
- Kaschula, Russell H, Dlutu, Bongiwe
- Authors: Kaschula, Russell H , Dlutu, Bongiwe
- Date: 2015
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/67052 , vital:29024 , https://books.google.co.za/books?id=6IpwCgAAQBAJ
- Description: publisher version , From Introduction: The aim of this article is to situate the importance of orality in rural communities within the paradigm of Technauriture, which is defined below. The chapter will also explore/describe the process of orality supported through community meetings, oral histories, and story-telling, and how it interacts with the recording process facilitated through modern technology, as well as the return of the oral material via technology. These objectives will be pursued as part of empirical data collected at Tshani, an area falling within the in Mankosi tribal authority in the Eastern Cape Province of South Africa. Mankosi’s twelve villages are inhabited by amaXhosa people and is situated in the Ngqeleni district in the former Transkei region. Mankosi is about 76 kilometres away from Mthatha, the major city in that area. These villages are under the Nyandeni Local Municipality and are regarded as very disadvantaged. There is poor sanitation, gravel roads, and few local people have access to electricity. Most of the villagers depend on government support grants. These include Child Support Grants, Old Age Grants, Disability Grants, and Foster-Care Grants. Furthermore, most of the community is involved in small-scale agriculture for survival. People often move, temporarily, from their village to towns in order to gain employment, including domestic work and working on the mines in the mineral rich Gauteng Province. They send cash remittances home to their families. The primary technological devices that people in the village are familiar with would be radio and the cell phone. Even television sets are relatively uncommon.
- Full Text: false
- Date Issued: 2015
- Authors: Kaschula, Russell H , Dlutu, Bongiwe
- Date: 2015
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/67052 , vital:29024 , https://books.google.co.za/books?id=6IpwCgAAQBAJ
- Description: publisher version , From Introduction: The aim of this article is to situate the importance of orality in rural communities within the paradigm of Technauriture, which is defined below. The chapter will also explore/describe the process of orality supported through community meetings, oral histories, and story-telling, and how it interacts with the recording process facilitated through modern technology, as well as the return of the oral material via technology. These objectives will be pursued as part of empirical data collected at Tshani, an area falling within the in Mankosi tribal authority in the Eastern Cape Province of South Africa. Mankosi’s twelve villages are inhabited by amaXhosa people and is situated in the Ngqeleni district in the former Transkei region. Mankosi is about 76 kilometres away from Mthatha, the major city in that area. These villages are under the Nyandeni Local Municipality and are regarded as very disadvantaged. There is poor sanitation, gravel roads, and few local people have access to electricity. Most of the villagers depend on government support grants. These include Child Support Grants, Old Age Grants, Disability Grants, and Foster-Care Grants. Furthermore, most of the community is involved in small-scale agriculture for survival. People often move, temporarily, from their village to towns in order to gain employment, including domestic work and working on the mines in the mineral rich Gauteng Province. They send cash remittances home to their families. The primary technological devices that people in the village are familiar with would be radio and the cell phone. Even television sets are relatively uncommon.
- Full Text: false
- Date Issued: 2015
Sculpting with fire: celebrating ephemerality at AfrikaBurn 2015 in the Tankwa Karoo, South Africa
- Authors: Steele, John
- Date: 2015
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/11260/957 , vital:30075
- Description: Land art, and some installation art, is usually aimed at relatively temporarily manipulating the surface of the earth. AfrikaBurn takes place annually in the near-desert of the Tankwa Karoo, South Africa. It is a communal event unique to Africa, and manifests as a fleeting week-long series of interventions in the natural environment, partially aimed at creating and then actively destroying free-standing public sculptures, some of which are huge and intricate. AfrikaBurn gives any one of the thousands of participants an opportunity to be inspired on any scale to generate artworks that take into account a principle that no debris whatsoever is left behind on the surface of the earth after a week-long celebration of creative energies. Unlike, for instance, an artwork built on the edge of the Indian Ocean in the Eastern Cape, where rough tidal seas would ensure gradual destruction, at AfrikaBurn, the sacrificial method of choice is controlled rapid burning, under the direction of a specified firemaster. This paper seeks to unbundle some aspects of land and installation art in Southern Africa with specific reference to AfrikaBurn 2015 events and anti-fracking initiatives. This is within a context that takes into account recognition that even seemingly durable public sculptures are subject to change and may even physically disappear with the passing of time.
- Full Text:
- Date Issued: 2015
- Authors: Steele, John
- Date: 2015
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/11260/957 , vital:30075
- Description: Land art, and some installation art, is usually aimed at relatively temporarily manipulating the surface of the earth. AfrikaBurn takes place annually in the near-desert of the Tankwa Karoo, South Africa. It is a communal event unique to Africa, and manifests as a fleeting week-long series of interventions in the natural environment, partially aimed at creating and then actively destroying free-standing public sculptures, some of which are huge and intricate. AfrikaBurn gives any one of the thousands of participants an opportunity to be inspired on any scale to generate artworks that take into account a principle that no debris whatsoever is left behind on the surface of the earth after a week-long celebration of creative energies. Unlike, for instance, an artwork built on the edge of the Indian Ocean in the Eastern Cape, where rough tidal seas would ensure gradual destruction, at AfrikaBurn, the sacrificial method of choice is controlled rapid burning, under the direction of a specified firemaster. This paper seeks to unbundle some aspects of land and installation art in Southern Africa with specific reference to AfrikaBurn 2015 events and anti-fracking initiatives. This is within a context that takes into account recognition that even seemingly durable public sculptures are subject to change and may even physically disappear with the passing of time.
- Full Text:
- Date Issued: 2015
Seasonality, behaviour and philopatry of spotted ragged tooth sharks Carcharias taurus in Eastern Cape nursery areas, South Africa
- Smale, Malcolm J, Dicken, Matthew L, Booth, Anthony J
- Authors: Smale, Malcolm J , Dicken, Matthew L , Booth, Anthony J
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/126672 , vital:35910 , https://doi.10.2989/1814232X.2015.1043342
- Description: Spotted ragged-tooth sharks Carcharias taurus occur along the southern and eastern coasts of South Africa. We report on movements of juveniles and adults within a known nursery area on the Eastern Cape coast using acoustic telemetry. The focus area of the study was Algoa Bay, where six VEMCO VR2 ultrasonic receivers were placed at known shark aggregation sites. An additional receiver was placed at Thunderbolt Reef, approximately 2 km southwest of Cape Recife, the south-western tip of Algoa Bay. Single receivers were also deployed at Port Alfred and East London, some 45 and 170 km north-east of Algoa Bay, respectively. VEMCO acoustic V16 tags were either surgically implanted (n = 37) or attached externally using dart heads (n = 6) between January 2003 and March 2006. Surgically implanted tags were recorded over multiple months and years, whereas external tags were probably lost shortly after tagging because they were detected for very short periods. Sharks moved extensively between the sites and revisited monitored reefs over time-periods of months and years, demonstrating philopatry. Departures from and arrivals at reefs were more frequently recorded at sunset and sunrise, respectively. Sharks were detected throughout the year but they spent more time at aggregation sites during summer and autumn, indicating seasonal abundance in agreement with previous findings. Movements away from study reefs were attributed to either foraging or movements to other reefs. Despite extensive movements around the bay and beyond, both juveniles and adults exhibited philopatry to the study area over multiple years.
- Full Text:
- Date Issued: 2015
- Authors: Smale, Malcolm J , Dicken, Matthew L , Booth, Anthony J
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/126672 , vital:35910 , https://doi.10.2989/1814232X.2015.1043342
- Description: Spotted ragged-tooth sharks Carcharias taurus occur along the southern and eastern coasts of South Africa. We report on movements of juveniles and adults within a known nursery area on the Eastern Cape coast using acoustic telemetry. The focus area of the study was Algoa Bay, where six VEMCO VR2 ultrasonic receivers were placed at known shark aggregation sites. An additional receiver was placed at Thunderbolt Reef, approximately 2 km southwest of Cape Recife, the south-western tip of Algoa Bay. Single receivers were also deployed at Port Alfred and East London, some 45 and 170 km north-east of Algoa Bay, respectively. VEMCO acoustic V16 tags were either surgically implanted (n = 37) or attached externally using dart heads (n = 6) between January 2003 and March 2006. Surgically implanted tags were recorded over multiple months and years, whereas external tags were probably lost shortly after tagging because they were detected for very short periods. Sharks moved extensively between the sites and revisited monitored reefs over time-periods of months and years, demonstrating philopatry. Departures from and arrivals at reefs were more frequently recorded at sunset and sunrise, respectively. Sharks were detected throughout the year but they spent more time at aggregation sites during summer and autumn, indicating seasonal abundance in agreement with previous findings. Movements away from study reefs were attributed to either foraging or movements to other reefs. Despite extensive movements around the bay and beyond, both juveniles and adults exhibited philopatry to the study area over multiple years.
- Full Text:
- Date Issued: 2015
The landscape of childhood: play and place as tools to understanding children’s enviromental use and perceptions
- Alexander, Jamie K, Cocks, Michelle L, Shackleton, Charlie M
- Authors: Alexander, Jamie K , Cocks, Michelle L , Shackleton, Charlie M
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141165 , vital:37949 , DOI: 10.1007/s10745-015-9755-z
- Description: Research has shown that children are the greatest users of natural areas and that childhood experiences strongly shape adults’ environmental values. This project was designed to ascertain children’s environmental uses and perceptions in two rural villages in the Eastern Cape, South Africa, utilising children’s use of the environment for play and their sense of place as key focus areas. Several factors influenced children’s environmental use, including safety fears, increased consumption of western media and environmental restrictions imposed by the state, revealing how South Africa’s high level of violence against women and children contributes to gendered environmental use and knowledge, and bringing about concern for children’s cultural identity in an increasingly westernised world.
- Full Text:
- Date Issued: 2015
- Authors: Alexander, Jamie K , Cocks, Michelle L , Shackleton, Charlie M
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141165 , vital:37949 , DOI: 10.1007/s10745-015-9755-z
- Description: Research has shown that children are the greatest users of natural areas and that childhood experiences strongly shape adults’ environmental values. This project was designed to ascertain children’s environmental uses and perceptions in two rural villages in the Eastern Cape, South Africa, utilising children’s use of the environment for play and their sense of place as key focus areas. Several factors influenced children’s environmental use, including safety fears, increased consumption of western media and environmental restrictions imposed by the state, revealing how South Africa’s high level of violence against women and children contributes to gendered environmental use and knowledge, and bringing about concern for children’s cultural identity in an increasingly westernised world.
- Full Text:
- Date Issued: 2015
The subspecies of Antarctic Terns (Sterna vittata) wintering on the South African coast: evidence from morphology, genetics and stable isotopes
- Connan, Maëlle, Teske, Peter R, Tree, Anthony J, Whittington, Philip A, McQuaid, Christopher D
- Authors: Connan, Maëlle , Teske, Peter R , Tree, Anthony J , Whittington, Philip A , McQuaid, Christopher D
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444854 , vital:74303 , https://doi.org/10.1071/MU14089
- Description: Five to seven subspecies of Antarctic Tern (Sterna vittata) are recognised, with at least three (S. v. vittata, S. v. tristanensis and S. v. sanctipauli) wintering in South Africa. Morphological characters used to define these subspecies are not perfectly reliable, but fidelity to nesting site suggests they could be genetically distinct. We used morphological data and DNA to investigate the validity of subspecies. We further used stable isotope analysis of feather samples collected from the non-breeding grounds in South Africa to attempt to ascertain the population of origin. Nuclear and mitochondrial DNA sequence data identified two major genetic clades: one mostly comprised individuals partially or completely matching the morphological description of S. v. tristanensis, the other included individuals from S. v. vittata and S. v. sanctipauli. Stable isotope values indicated that juveniles originated from at least three populations. Irrespective of their morphological and genetic characteristics, most immatures moulted in Antarctic waters, and adults moulted in various habitats. Their colony of origin could not therefore be inferred from stable isotope values from feathers. Results indicate that morphological groupings may reflect a north-south cline across the Indian Ocean. Adequate conservation strategies require rigorous reassessment of the currently accepted subspecies, including DNA analyses of samples from the breeding grounds, particularly on Amsterdam and St Paul Islands.
- Full Text:
- Date Issued: 2015
- Authors: Connan, Maëlle , Teske, Peter R , Tree, Anthony J , Whittington, Philip A , McQuaid, Christopher D
- Date: 2015
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444854 , vital:74303 , https://doi.org/10.1071/MU14089
- Description: Five to seven subspecies of Antarctic Tern (Sterna vittata) are recognised, with at least three (S. v. vittata, S. v. tristanensis and S. v. sanctipauli) wintering in South Africa. Morphological characters used to define these subspecies are not perfectly reliable, but fidelity to nesting site suggests they could be genetically distinct. We used morphological data and DNA to investigate the validity of subspecies. We further used stable isotope analysis of feather samples collected from the non-breeding grounds in South Africa to attempt to ascertain the population of origin. Nuclear and mitochondrial DNA sequence data identified two major genetic clades: one mostly comprised individuals partially or completely matching the morphological description of S. v. tristanensis, the other included individuals from S. v. vittata and S. v. sanctipauli. Stable isotope values indicated that juveniles originated from at least three populations. Irrespective of their morphological and genetic characteristics, most immatures moulted in Antarctic waters, and adults moulted in various habitats. Their colony of origin could not therefore be inferred from stable isotope values from feathers. Results indicate that morphological groupings may reflect a north-south cline across the Indian Ocean. Adequate conservation strategies require rigorous reassessment of the currently accepted subspecies, including DNA analyses of samples from the breeding grounds, particularly on Amsterdam and St Paul Islands.
- Full Text:
- Date Issued: 2015
The violence beneath the veil of politeness: reflections on race and power in the academy
- Authors: Njovane, Thandokazi
- Date: 2015
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/142121 , vital:38051 , ISBN 9781869142902 , https://books.google.co.za/books?id=49o8rgEACAAJanddq=Being+at+home:+Race,+institutional+culture+and+transformation+at+South+African+higher+education+institutionandhl=enandsa=Xandved=0ahUKEwiPgsa6mpjjAhXNN8AKHbNwAtoQ6AEIKDAA
- Description: This edited work has gathered together contributions on how to transform universities in South Africa; as many are struggling to shift their institutional culture. In a South African context, transformation means to attempt to change higher education institutions such that they no longer reflect the values promoted by apartheid but rather reflect the values embodied in South Africa's 1996 Constitution. Institutional culture is the main subject for discussion in this book. In order to transform South Africa's universities, the contributors begin by analyzing the idea of what a university is, and relatedly, what its ideal aims are. A second theme is to understand what institutional culture is and how it functions. Moreover, transformation cannot occur without transforming the broader cultures of which they are a part. Related to this theme is a general concern about how contemporary moves towards the instrumentalization of higher education affect the ability to transform institutions. These institutions are being pushed to conform to goals that are outside the traditional idea of a university, such as concerns that universities are being 'bureaucratized' and becoming corporations, instead of a place of learning open to all. In conclusion it can be said that the contemporary South African academic community has an opportunity to recreate itself as the end of apartheid created space for engaging in transformative epistemic projects. The transformation of the tertiary sector entails a transformation of institutional cultures.
- Full Text:
- Date Issued: 2015
- Authors: Njovane, Thandokazi
- Date: 2015
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/142121 , vital:38051 , ISBN 9781869142902 , https://books.google.co.za/books?id=49o8rgEACAAJanddq=Being+at+home:+Race,+institutional+culture+and+transformation+at+South+African+higher+education+institutionandhl=enandsa=Xandved=0ahUKEwiPgsa6mpjjAhXNN8AKHbNwAtoQ6AEIKDAA
- Description: This edited work has gathered together contributions on how to transform universities in South Africa; as many are struggling to shift their institutional culture. In a South African context, transformation means to attempt to change higher education institutions such that they no longer reflect the values promoted by apartheid but rather reflect the values embodied in South Africa's 1996 Constitution. Institutional culture is the main subject for discussion in this book. In order to transform South Africa's universities, the contributors begin by analyzing the idea of what a university is, and relatedly, what its ideal aims are. A second theme is to understand what institutional culture is and how it functions. Moreover, transformation cannot occur without transforming the broader cultures of which they are a part. Related to this theme is a general concern about how contemporary moves towards the instrumentalization of higher education affect the ability to transform institutions. These institutions are being pushed to conform to goals that are outside the traditional idea of a university, such as concerns that universities are being 'bureaucratized' and becoming corporations, instead of a place of learning open to all. In conclusion it can be said that the contemporary South African academic community has an opportunity to recreate itself as the end of apartheid created space for engaging in transformative epistemic projects. The transformation of the tertiary sector entails a transformation of institutional cultures.
- Full Text:
- Date Issued: 2015
Towards shaping the field: theorising the knowledge in a formal course for academic developers
- Vorster, Jo-Anne E, Quinn, Lynn
- Authors: Vorster, Jo-Anne E , Quinn, Lynn
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/66578 , vital:28966 , https://doi.org/10.1080/07294360.2015.1070126
- Description: publisher version , In recent years there have been calls both for building the knowledge base of academic development (AD) and for systematic induction of newcomers to the field if AD is to advance as a professional and an academic field. Despite the importance and complexity of AD, induction of novice academic developers remains mostly informal and predominantly focuses on the practices of the field. We argue that more-experienced academic developers have an obligation to provide formal and systematic routes into the field and its knowledge base than is currently the case. One way of doing this is through offering a formal course for growing the next generation of academic developers. Such a course could equip newcomers with a more solid and shared knowledge base, thus contributing to shaping the epistemic spine of AD. In this paper, using Maton's Legitimation Code Theory, we offer an analysis of an existing course aimed at equipping novices with the theoretical and practical knowledge to enable them to solve some of the problems in higher education. From this analysis have emerged general principles that could inform the selection, sequencing and pacing of knowledge in a formal course for academic developers.
- Full Text: false
- Date Issued: 2015
- Authors: Vorster, Jo-Anne E , Quinn, Lynn
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/66578 , vital:28966 , https://doi.org/10.1080/07294360.2015.1070126
- Description: publisher version , In recent years there have been calls both for building the knowledge base of academic development (AD) and for systematic induction of newcomers to the field if AD is to advance as a professional and an academic field. Despite the importance and complexity of AD, induction of novice academic developers remains mostly informal and predominantly focuses on the practices of the field. We argue that more-experienced academic developers have an obligation to provide formal and systematic routes into the field and its knowledge base than is currently the case. One way of doing this is through offering a formal course for growing the next generation of academic developers. Such a course could equip newcomers with a more solid and shared knowledge base, thus contributing to shaping the epistemic spine of AD. In this paper, using Maton's Legitimation Code Theory, we offer an analysis of an existing course aimed at equipping novices with the theoretical and practical knowledge to enable them to solve some of the problems in higher education. From this analysis have emerged general principles that could inform the selection, sequencing and pacing of knowledge in a formal course for academic developers.
- Full Text: false
- Date Issued: 2015
Water footprint assessment to inform water management and policy making in South Africa
- Pahlow, Markus, Snowball, Jeanette D, Fraser, Gavin C G
- Authors: Pahlow, Markus , Snowball, Jeanette D , Fraser, Gavin C G
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68813 , vital:29327 , http://dx.doi.org/10.4314/wsa.v41i3.02
- Description: Publisher version , One method to inform decisions with respect to sustainable, efficient and equitable water allocation and use is water footprint assessment (WFA). This paper presents a preliminary WFA of South Africa (SA) based on data for the period 1996-2005. Crop production was found to contribute about 75% of the total water footprint of national production. The total water footprint of crop production is mainly composed of five crops: maize, fodder crops, sugarcane, wheat and sunflower seed, which account for 83% of the crop water footprint. The average water footprint of a South African consumer is 1 255 m3/yr, below the world average of 1 385 m3/yr, and is dominated by the consumption of meat (32%) and cereals (29%). About one fifth of this water footprint of consumption is external to SA. While SA is a net virtual water importer, the virtual water trade analysis revealed that a large share of blue water consumption is related to export. Sustainability concerns are that the major river basins face severe blue-water scarcity for extended periods of the year, and that water pollution levels related to nitrogen and phosphorus were found to be unsustainable in all river basins in SA. Efficient allocation and use of water is investigated by means of comparing the consumptive water footprint to global benchmark values, as well as the economic green- and blue-water productivity and the economic land productivity of the crops cultivated in SA. Furthermore, crops with specific potential for biofuel production are assessed. Lastly, recommendations to address the identified issues are given.
- Full Text:
- Date Issued: 2015
- Authors: Pahlow, Markus , Snowball, Jeanette D , Fraser, Gavin C G
- Date: 2015
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68813 , vital:29327 , http://dx.doi.org/10.4314/wsa.v41i3.02
- Description: Publisher version , One method to inform decisions with respect to sustainable, efficient and equitable water allocation and use is water footprint assessment (WFA). This paper presents a preliminary WFA of South Africa (SA) based on data for the period 1996-2005. Crop production was found to contribute about 75% of the total water footprint of national production. The total water footprint of crop production is mainly composed of five crops: maize, fodder crops, sugarcane, wheat and sunflower seed, which account for 83% of the crop water footprint. The average water footprint of a South African consumer is 1 255 m3/yr, below the world average of 1 385 m3/yr, and is dominated by the consumption of meat (32%) and cereals (29%). About one fifth of this water footprint of consumption is external to SA. While SA is a net virtual water importer, the virtual water trade analysis revealed that a large share of blue water consumption is related to export. Sustainability concerns are that the major river basins face severe blue-water scarcity for extended periods of the year, and that water pollution levels related to nitrogen and phosphorus were found to be unsustainable in all river basins in SA. Efficient allocation and use of water is investigated by means of comparing the consumptive water footprint to global benchmark values, as well as the economic green- and blue-water productivity and the economic land productivity of the crops cultivated in SA. Furthermore, crops with specific potential for biofuel production are assessed. Lastly, recommendations to address the identified issues are given.
- Full Text:
- Date Issued: 2015
The Educational Journal
- Date: 2014-11
- Subjects: Education – South Africa , South Africa – Economic conditions , South Africa – Social conditions
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/41657 , vital:36552 , Bulk File 7
- Description: The Educational Journal was the official organ of the Teachers' League of South Africa and focussed on education within the context of a racialized South Africa. From the 2000s, the journal was published by the National Union of Public Service and Allied Workers (NUPSAW), a trade union formed in August 1998 from the amalgamation of militant and moderate trade unions and also operated in the education sphere.
- Full Text: false
- Date Issued: 2014-11
- Date: 2014-11
- Subjects: Education – South Africa , South Africa – Economic conditions , South Africa – Social conditions
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/41657 , vital:36552 , Bulk File 7
- Description: The Educational Journal was the official organ of the Teachers' League of South Africa and focussed on education within the context of a racialized South Africa. From the 2000s, the journal was published by the National Union of Public Service and Allied Workers (NUPSAW), a trade union formed in August 1998 from the amalgamation of militant and moderate trade unions and also operated in the education sphere.
- Full Text: false
- Date Issued: 2014-11
The Educational Journal
- Date: 2014-11
- Subjects: Education – South Africa , South Africa – Economic conditions , South Africa – Social conditions
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/38629 , vital:34841 , Bulk File 7
- Description: The Educational Journal was the official organ of the Teachers' League of South Africa and focussed on education within the context of a racialized South Africa. From the 2000s, the journal was published by the National Union of Public Service and Allied Workers (NUPSAW), a trade union formed in August 1998 from the amalgamation of militant and moderate trade unions and also operated in the education sphere.
- Full Text: false
- Date Issued: 2014-11
- Date: 2014-11
- Subjects: Education – South Africa , South Africa – Economic conditions , South Africa – Social conditions
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/38629 , vital:34841 , Bulk File 7
- Description: The Educational Journal was the official organ of the Teachers' League of South Africa and focussed on education within the context of a racialized South Africa. From the 2000s, the journal was published by the National Union of Public Service and Allied Workers (NUPSAW), a trade union formed in August 1998 from the amalgamation of militant and moderate trade unions and also operated in the education sphere.
- Full Text: false
- Date Issued: 2014-11
Activated carbon from lignocellulosic waste residues: effect of activating agent on porosity characteristics and use as adsorbents for organic species
- Olorundare, O F, Okonkwo, J O, Msagati, T A M, Mamba, Bhekie B, Krause, Rui W M
- Authors: Olorundare, O F , Okonkwo, J O , Msagati, T A M , Mamba, Bhekie B , Krause, Rui W M
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125233 , vital:35748 , https://doi.org/10.1007/s11270-014-1876-2
- Description: This paper reports on the effect of activating agents such as the impregnation ratio of phosphoric acid (1:1–1:5) at constant activation temperature on the performance of porous activated carbon from waste residues (maize tassel). The variation in the impregnation ratio of the produced activated carbon (AC) from 1:1 to 1:5 enabled the preparation of a high surface area (1,263 m2/g) and a large pore volume (1.592 cm3/g) of AC produced from maize tassel (MT) using a convectional chemical activating agent (phosphoric acid). Impregnation ratios (IR) of the precursors were varied between 1:1 and 1:5 in which it was found that the ratio of 1:4 was optimal based on the high surface area, while 1:5 has the optimal pore volume value for the produced activated carbon.
- Full Text:
- Date Issued: 2014
- Authors: Olorundare, O F , Okonkwo, J O , Msagati, T A M , Mamba, Bhekie B , Krause, Rui W M
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125233 , vital:35748 , https://doi.org/10.1007/s11270-014-1876-2
- Description: This paper reports on the effect of activating agents such as the impregnation ratio of phosphoric acid (1:1–1:5) at constant activation temperature on the performance of porous activated carbon from waste residues (maize tassel). The variation in the impregnation ratio of the produced activated carbon (AC) from 1:1 to 1:5 enabled the preparation of a high surface area (1,263 m2/g) and a large pore volume (1.592 cm3/g) of AC produced from maize tassel (MT) using a convectional chemical activating agent (phosphoric acid). Impregnation ratios (IR) of the precursors were varied between 1:1 and 1:5 in which it was found that the ratio of 1:4 was optimal based on the high surface area, while 1:5 has the optimal pore volume value for the produced activated carbon.
- Full Text:
- Date Issued: 2014
Antimicrobial properties and isotope investigations of South African honey
- Khan, F, Hill, Jaclyn M, Kaehler, Sven, Allsopp, M, van Vuuren, S
- Authors: Khan, F , Hill, Jaclyn M , Kaehler, Sven , Allsopp, M , van Vuuren, S
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444539 , vital:74249 , https://doi.org/10.1111/jam.12533
- Description: The therapeutic potential of honey for the treatment of wound infections is well documented. However, South African (SA) honey has been poorly explored as an antimicrobial agent and given the well‐established antimicrobial properties of the indigenous plant species from SA, there is the potential that honey from this geographical region may exhibit noteworthy anti‐infective properties. In this study, the antimicrobial properties of 42 SA honey samples were determined.
- Full Text:
- Date Issued: 2014
- Authors: Khan, F , Hill, Jaclyn M , Kaehler, Sven , Allsopp, M , van Vuuren, S
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/444539 , vital:74249 , https://doi.org/10.1111/jam.12533
- Description: The therapeutic potential of honey for the treatment of wound infections is well documented. However, South African (SA) honey has been poorly explored as an antimicrobial agent and given the well‐established antimicrobial properties of the indigenous plant species from SA, there is the potential that honey from this geographical region may exhibit noteworthy anti‐infective properties. In this study, the antimicrobial properties of 42 SA honey samples were determined.
- Full Text:
- Date Issued: 2014
Cytotoxicity, phytochemical analysis and antioxidant activity of crude extracts from Rhizomes of Elephantorrhiza Elephantina and Pentanisia Prunelloides
- Mpofu, Smart J, Msagati, Titus A M, Krause, Rui W M
- Authors: Mpofu, Smart J , Msagati, Titus A M , Krause, Rui W M
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125097 , vital:35728 , https://doi.org/10.4314/ajtcam.v11i1.6
- Description: Background: Elephantorrhiza elephantina (Ee) and Pentanisia prunelloides (Pp) are two medicinal plants which are widely used to remedy various ailments including diarrhoea, dysentery, inflammation, fever, rheumatism, heartburn, tuberculosis, haemorrhoids, skin diseases, perforated peptic ulcers and sore joints in southern Africa (South Africa, Swaziland, Botswana and Zimbabwe). The following study was conducted to explore the in vitro cytotoxicity, antioxidant properties and phytochemical profile of the two medicinal plants. Materials and Methods: The cytotoxicity of the aqueous and methanol extracts and fractions of both species was studied using the brine shrimp lethality tests (BST) for the first time. Results: The results demonstrated that the lethality (LC50) for crude extracts for both plants ranged between 1.8 and 5.8 ppm and was relatively greater than that for the methanol, ethyl acetate and chloroform fractions of the extracts which ranged between 2.1 ppm and 27 ppm. This suggested that crude extracts were more potent than their respective fractions, further explaining that the different fractions of phytochemicals in these plant species work jointly (in synergy) to exert their therapeutic efficacy. Both aqueous and methanol extracts of the two medicinal plants demonstrated a high degree of antioxidant capacity against the DPPH radical with the Duh and Yen inhibition percentage ranging between 4.5% and 72%. Phytochemical studies of the rhizome extracts showed that the major compounds present include flavonoids, tannins, anthocyanidins, anthraquinones, triterpenoids (oleanolic acid), the steroidal saponin Diosgenin, the sugars, rhamnose, glucuronic acid, Arabinose and hexoses. Conclusion: This is the first report of the detection and isolation of diosgenin and oleanolic acid from the rhizome extracts of Ee and Pp. All structures were determined using spectroscopic/spectrometric techniques (1H NMR and 13C and LC-ESI-MS) and by comparison with literature data.
- Full Text:
- Date Issued: 2014
- Authors: Mpofu, Smart J , Msagati, Titus A M , Krause, Rui W M
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125097 , vital:35728 , https://doi.org/10.4314/ajtcam.v11i1.6
- Description: Background: Elephantorrhiza elephantina (Ee) and Pentanisia prunelloides (Pp) are two medicinal plants which are widely used to remedy various ailments including diarrhoea, dysentery, inflammation, fever, rheumatism, heartburn, tuberculosis, haemorrhoids, skin diseases, perforated peptic ulcers and sore joints in southern Africa (South Africa, Swaziland, Botswana and Zimbabwe). The following study was conducted to explore the in vitro cytotoxicity, antioxidant properties and phytochemical profile of the two medicinal plants. Materials and Methods: The cytotoxicity of the aqueous and methanol extracts and fractions of both species was studied using the brine shrimp lethality tests (BST) for the first time. Results: The results demonstrated that the lethality (LC50) for crude extracts for both plants ranged between 1.8 and 5.8 ppm and was relatively greater than that for the methanol, ethyl acetate and chloroform fractions of the extracts which ranged between 2.1 ppm and 27 ppm. This suggested that crude extracts were more potent than their respective fractions, further explaining that the different fractions of phytochemicals in these plant species work jointly (in synergy) to exert their therapeutic efficacy. Both aqueous and methanol extracts of the two medicinal plants demonstrated a high degree of antioxidant capacity against the DPPH radical with the Duh and Yen inhibition percentage ranging between 4.5% and 72%. Phytochemical studies of the rhizome extracts showed that the major compounds present include flavonoids, tannins, anthocyanidins, anthraquinones, triterpenoids (oleanolic acid), the steroidal saponin Diosgenin, the sugars, rhamnose, glucuronic acid, Arabinose and hexoses. Conclusion: This is the first report of the detection and isolation of diosgenin and oleanolic acid from the rhizome extracts of Ee and Pp. All structures were determined using spectroscopic/spectrometric techniques (1H NMR and 13C and LC-ESI-MS) and by comparison with literature data.
- Full Text:
- Date Issued: 2014
Potential Gaps during the Transition from the Embodied through Symbolic to Formal Worlds of Reflective Symmetry:
- Mhlolo, Michael K, Schäfer, Marc
- Authors: Mhlolo, Michael K , Schäfer, Marc
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141117 , vital:37945 , https://doi.org/10.1080/10288457.2014.925269
- Description: Even though reflective symmetry is heavily embedded in the everyday, learners continue to experience challenges when they mathematize concepts from this informal/everyday context. In this article we argue that symmetry exists in nature, it can also be symbolized algebraically and it can be abstracted into the world of axioms and theorems. We problematize this multiple nature of symmetry which on one hand is supportive and on the other acts as a contributory factor to learners' gaps in knowledge. Tall's three worlds of mathematics helped us to show the transition of symmetry from the embodied through symbolic to the formal world and the inherent gaps attributed to the shifts in thinking thereof. We then used this same framework to analyse learners' responses to a reflective symmetry task. The results show that many learner responses could be explained explicitly by the lack of flexibility in the applicability of experiences in the embodied world of reflective symmetry.
- Full Text:
- Date Issued: 2014
- Authors: Mhlolo, Michael K , Schäfer, Marc
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141117 , vital:37945 , https://doi.org/10.1080/10288457.2014.925269
- Description: Even though reflective symmetry is heavily embedded in the everyday, learners continue to experience challenges when they mathematize concepts from this informal/everyday context. In this article we argue that symmetry exists in nature, it can also be symbolized algebraically and it can be abstracted into the world of axioms and theorems. We problematize this multiple nature of symmetry which on one hand is supportive and on the other acts as a contributory factor to learners' gaps in knowledge. Tall's three worlds of mathematics helped us to show the transition of symmetry from the embodied through symbolic to the formal world and the inherent gaps attributed to the shifts in thinking thereof. We then used this same framework to analyse learners' responses to a reflective symmetry task. The results show that many learner responses could be explained explicitly by the lack of flexibility in the applicability of experiences in the embodied world of reflective symmetry.
- Full Text:
- Date Issued: 2014
Predicting the geographic distribution of Lucilia sericata and Lucilia cuprina (Diptera Calliphoridae) in South Africa
- Williams, Kirstin A, Richards, Cameron S, Villet, Martin H
- Authors: Williams, Kirstin A , Richards, Cameron S , Villet, Martin H
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440681 , vital:73803 , https://hdl.handle.net/10520/EJC158017
- Description: Lucilia sericata (Meigen, 1826) and Lucilia cuprina (Wiedemann, 1830) (Diptera: Calliphoridae: Luciliinae) have medical, veterinary and forensic importance. Knowing their distribution in South Africa would allow more effective management and utilisation of these flies. Their predicted geographic distributions in South Africa were modelled using maximum entropy analysis of selected climatic variables. The most important environmental variables in modelling the distributions were the magnitude of monthly rainfall and the magnitude of the monthly maximum temperature for L. sericata and the seasonal variation in monthly mean humidity and magnitude of monthly rainfall for L. cuprina. A clear geographical bias was shown in museum records and supports the need for focused surveys. There was no correlation between the predicted distribution of L. cuprina and sheep farming in South Africa, nor between the predicted distribution of L. sericata and human population density. Although their patterns of occurrence differed, both species are widely distributed in South Africa and therefore one cannot identify these flies by locality alone - morphological or molecular identification is necessary.
- Full Text:
- Date Issued: 2014
- Authors: Williams, Kirstin A , Richards, Cameron S , Villet, Martin H
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440681 , vital:73803 , https://hdl.handle.net/10520/EJC158017
- Description: Lucilia sericata (Meigen, 1826) and Lucilia cuprina (Wiedemann, 1830) (Diptera: Calliphoridae: Luciliinae) have medical, veterinary and forensic importance. Knowing their distribution in South Africa would allow more effective management and utilisation of these flies. Their predicted geographic distributions in South Africa were modelled using maximum entropy analysis of selected climatic variables. The most important environmental variables in modelling the distributions were the magnitude of monthly rainfall and the magnitude of the monthly maximum temperature for L. sericata and the seasonal variation in monthly mean humidity and magnitude of monthly rainfall for L. cuprina. A clear geographical bias was shown in museum records and supports the need for focused surveys. There was no correlation between the predicted distribution of L. cuprina and sheep farming in South Africa, nor between the predicted distribution of L. sericata and human population density. Although their patterns of occurrence differed, both species are widely distributed in South Africa and therefore one cannot identify these flies by locality alone - morphological or molecular identification is necessary.
- Full Text:
- Date Issued: 2014
Re-thinking engagement: Dialogic strategies of alignment in letters to two South African newspapers
- Smith, Jade, Adendorff, Ralph D
- Authors: Smith, Jade , Adendorff, Ralph D
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125876 , vital:35828 , https://doi.org/10.1080/10228195.2014.909872
- Description: This article uses an appraisal analysis of 40 letters to the Daily Sun and The Times newspapers in South Africa to illustrate a reconceptualisation of the Engagement system. It discusses dialogism (Bakhtin 1981), which inspired the creation of the Engagement framework by White (2003), who classified attempts to either align or disalign readers with a writer’s stance. Contrary to the options for dialogic Engagement proposed by Martin and White (2005) and White and Don (2012), the data suggests that not all Engagement strategies carry equal power of alignment, as the framework’s systemic layout implies. This prompts a re-thinking of the Engagement categories as occurring along a continuum of their strength.
- Full Text:
- Date Issued: 2014
- Authors: Smith, Jade , Adendorff, Ralph D
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125876 , vital:35828 , https://doi.org/10.1080/10228195.2014.909872
- Description: This article uses an appraisal analysis of 40 letters to the Daily Sun and The Times newspapers in South Africa to illustrate a reconceptualisation of the Engagement system. It discusses dialogism (Bakhtin 1981), which inspired the creation of the Engagement framework by White (2003), who classified attempts to either align or disalign readers with a writer’s stance. Contrary to the options for dialogic Engagement proposed by Martin and White (2005) and White and Don (2012), the data suggests that not all Engagement strategies carry equal power of alignment, as the framework’s systemic layout implies. This prompts a re-thinking of the Engagement categories as occurring along a continuum of their strength.
- Full Text:
- Date Issued: 2014
Reclaiming syndicalism: from Spain to South Africa to Global Labour Today
- Authors: Van der Walt, Lucien
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144824 , vital:38382 , DOI: 10.15173/glj.v5i2.1153
- Description: Union politics remain central to the new century. It remains central because of the ongoing importance of unions as mass movements, internationally, and because unions, like other popular movements, are confronted with the very real challenge of articulating an alternative, transformative vision. There is much to be learned from the historic and current tradition of anarcho-and revolutionary syndicalism.
- Full Text:
- Date Issued: 2014
- Authors: Van der Walt, Lucien
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144824 , vital:38382 , DOI: 10.15173/glj.v5i2.1153
- Description: Union politics remain central to the new century. It remains central because of the ongoing importance of unions as mass movements, internationally, and because unions, like other popular movements, are confronted with the very real challenge of articulating an alternative, transformative vision. There is much to be learned from the historic and current tradition of anarcho-and revolutionary syndicalism.
- Full Text:
- Date Issued: 2014
Stable isotope ratios indicate differential omnivory among syntopic rocky shore suspension-feeders
- Richoux, Nicole B, Vermeulen, Ilke, Froneman, P William
- Authors: Richoux, Nicole B , Vermeulen, Ilke , Froneman, P William
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68261 , vital:29224 , https://doi.org/10.1007/s00227-013-2358-6
- Description: Publisher version , We utilised stable isotope ratios to assess differences in diet among three indigenous and syntopic rocky shore suspension-feeders (mussels Perna perna, barnacles Tetraclita serrata, and polychaetes Gunnarea gaimardi). We also determined the spatial and temporal variability in the suspension-feeder diets by collecting specimens on two occasions from two regions adjacent to hydrologically distinct river mouths (i.e. one with larger annual freshwater throughput than the other). The results showed that the isotopic niches (used as proxies for trophic niches) of the three species did not overlap and that the barnacles occupied a trophic position (3.4) well above those of the mussels (2) and polychaetes (2.6). We ascribed the interspecific differences primarily to the disparate feeding mechanisms used by the species. Large-scale regional (~50 km) differences in suspension-feeder diets were apparent, but not small-scale (up to a few km north and south of each estuary mouth). The regional differences in diet resulted from the increased availability of estuarine-origin suspended particulate matter (SPM) and zooplankton in the region adjacent to the river with relatively larger freshwater output, although overall incorporation of zooplankton versus mixed SPM into consumer diets was relatively consistent between regions and through time. Temporal shifts in suspension-feeder diets were apparent from stable carbon isotope ratios in the consumers. Our results showcase the measurable effects of regional-scale processes that can alter the food sources for dominant primary consumers in the rocky intertidal, thus potentially affecting entire food webs through bottom-up processes. The clear evidence for trophic niche partitioning offers valuable insights into how potentially strong competitors can coexist.
- Full Text: false
- Date Issued: 2014
- Authors: Richoux, Nicole B , Vermeulen, Ilke , Froneman, P William
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68261 , vital:29224 , https://doi.org/10.1007/s00227-013-2358-6
- Description: Publisher version , We utilised stable isotope ratios to assess differences in diet among three indigenous and syntopic rocky shore suspension-feeders (mussels Perna perna, barnacles Tetraclita serrata, and polychaetes Gunnarea gaimardi). We also determined the spatial and temporal variability in the suspension-feeder diets by collecting specimens on two occasions from two regions adjacent to hydrologically distinct river mouths (i.e. one with larger annual freshwater throughput than the other). The results showed that the isotopic niches (used as proxies for trophic niches) of the three species did not overlap and that the barnacles occupied a trophic position (3.4) well above those of the mussels (2) and polychaetes (2.6). We ascribed the interspecific differences primarily to the disparate feeding mechanisms used by the species. Large-scale regional (~50 km) differences in suspension-feeder diets were apparent, but not small-scale (up to a few km north and south of each estuary mouth). The regional differences in diet resulted from the increased availability of estuarine-origin suspended particulate matter (SPM) and zooplankton in the region adjacent to the river with relatively larger freshwater output, although overall incorporation of zooplankton versus mixed SPM into consumer diets was relatively consistent between regions and through time. Temporal shifts in suspension-feeder diets were apparent from stable carbon isotope ratios in the consumers. Our results showcase the measurable effects of regional-scale processes that can alter the food sources for dominant primary consumers in the rocky intertidal, thus potentially affecting entire food webs through bottom-up processes. The clear evidence for trophic niche partitioning offers valuable insights into how potentially strong competitors can coexist.
- Full Text: false
- Date Issued: 2014
Starways Arts: a built environment expressing holistic lifestyles dedicated to visual and performing arts in Hogsback, Eastern Cape, South Africa
- Authors: Steele, John
- Date: 2014
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/11260/990 , vital:30179
- Description: In 1992, Anton van der Merwe and his life partner Gwyneth Lloyd moved from Randjesfontein Pottery in Midrand, between Johannesburg and Pretoria, to an undeveloped smallholding in the densely forested rural village of Hogsback. The past 22 years have seen an ongoing process of settling down and construction of necessary buildings. This paper seeks to explore aspects of philosophical and architectural influences that served as some of the foundation stones for creation of an eclectic series of buildings, including their home, visual arts studios, a gallery, a community theatre and guest accommodation. A review of these buildings will show that Van der Merwe and Lloyd have developed an idiosyncratic construction style that incorporates alternative technology with empathetic use of natural resources, which results in organically flowing living and working spaces that are fit for purpose, have substantial presence and have minimal environmental impact.
- Full Text:
- Date Issued: 2014
- Authors: Steele, John
- Date: 2014
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/11260/990 , vital:30179
- Description: In 1992, Anton van der Merwe and his life partner Gwyneth Lloyd moved from Randjesfontein Pottery in Midrand, between Johannesburg and Pretoria, to an undeveloped smallholding in the densely forested rural village of Hogsback. The past 22 years have seen an ongoing process of settling down and construction of necessary buildings. This paper seeks to explore aspects of philosophical and architectural influences that served as some of the foundation stones for creation of an eclectic series of buildings, including their home, visual arts studios, a gallery, a community theatre and guest accommodation. A review of these buildings will show that Van der Merwe and Lloyd have developed an idiosyncratic construction style that incorporates alternative technology with empathetic use of natural resources, which results in organically flowing living and working spaces that are fit for purpose, have substantial presence and have minimal environmental impact.
- Full Text:
- Date Issued: 2014