'Joining the academic life': South African students who succeed at university despite not meeting standard entry requirements
- Vincent, Louise, Idahosa, Grace E
- Authors: Vincent, Louise , Idahosa, Grace E
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141745 , vital:38001 , https://hdl.handle.net/10520/EJC159177
- Description: At present the Swedish points system is one of the main determinants of an applicant either being granted or refused entry into many South African higher education institutions (HEIs). Using a grounded theory approach, this article interprets the experiences of participants whose school performance and therefore university 'entry points' were lower than the expected norm. Despite not meeting standard university entry requirements, these students succeeded at university, completing their degrees in the minimum time available and going on to higher degrees. The journey of these participants - from low entry points to academic success - suggests that points based on school performance are not necessarily the best way of identifying students' potential to succeed in the contemporary South African educational context. If their entry points were not a good indication of their ability to thrive at university, the article asks, what is it about these participants that accounts for their success? And what implications does this have for South African practice, not only with regard to admissions policies but also in relation to the responsibilities of HEIs to students once they are admitted?
- Full Text:
- Date Issued: 2014
- Authors: Vincent, Louise , Idahosa, Grace E
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141745 , vital:38001 , https://hdl.handle.net/10520/EJC159177
- Description: At present the Swedish points system is one of the main determinants of an applicant either being granted or refused entry into many South African higher education institutions (HEIs). Using a grounded theory approach, this article interprets the experiences of participants whose school performance and therefore university 'entry points' were lower than the expected norm. Despite not meeting standard university entry requirements, these students succeeded at university, completing their degrees in the minimum time available and going on to higher degrees. The journey of these participants - from low entry points to academic success - suggests that points based on school performance are not necessarily the best way of identifying students' potential to succeed in the contemporary South African educational context. If their entry points were not a good indication of their ability to thrive at university, the article asks, what is it about these participants that accounts for their success? And what implications does this have for South African practice, not only with regard to admissions policies but also in relation to the responsibilities of HEIs to students once they are admitted?
- Full Text:
- Date Issued: 2014
'On the fringes of society’ and ‘out of the closest’: a response to ‘Sexual/Textual Politics
- Authors: Spencer, Lynda G
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/139034 , vital:37698 , https://doi.org/10.1080/02589001.2014.983324
- Description: Gibson Ncube’s ‘Sexual/Textual Politics: Rethinking gender and sexuality in gay Moroccan literature’ focuses on an emerging body of gay literature that is developing within the larger framework of Moroccan literature. Ncube attempts to illustrate how the contemporary narratives of Rachid O. and Abdellah Taïa portray the quotidian experiences of minority sexualities who strive to exist in the hegemonic heteropatriarchies of Moroccan societies. These narratives challenge and destabilise the heteronormative ideals of Arab-Muslim communities and endeavour to offer alternative ways of thinking about marginalised sexualities in the public space. This analysis draws on the feminist underpinnings of Maria Pia Lara to argue that private gay narratives have the potential to re-imagine the public domain.
- Full Text:
- Date Issued: 2014
- Authors: Spencer, Lynda G
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/139034 , vital:37698 , https://doi.org/10.1080/02589001.2014.983324
- Description: Gibson Ncube’s ‘Sexual/Textual Politics: Rethinking gender and sexuality in gay Moroccan literature’ focuses on an emerging body of gay literature that is developing within the larger framework of Moroccan literature. Ncube attempts to illustrate how the contemporary narratives of Rachid O. and Abdellah Taïa portray the quotidian experiences of minority sexualities who strive to exist in the hegemonic heteropatriarchies of Moroccan societies. These narratives challenge and destabilise the heteronormative ideals of Arab-Muslim communities and endeavour to offer alternative ways of thinking about marginalised sexualities in the public space. This analysis draws on the feminist underpinnings of Maria Pia Lara to argue that private gay narratives have the potential to re-imagine the public domain.
- Full Text:
- Date Issued: 2014
A comparative photophysicochemical study of mono substituted phthalocyanines grafted onto silica nanoparticles
- Fashina, Adebayo, Antunes, Edith M, Nyokong, Tebello
- Authors: Fashina, Adebayo , Antunes, Edith M , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193844 , vital:45399 , xlink:href="https://doi.org/10.1142/S1088424614500138"
- Description: In this study, we report on the covalent linking of carboxylic acid functionalized silica nanoparticles with zinc phthalocyanine mono-substituted non-peripherally and peripherally with either a 4-amino phenoxy (1, peripheral and 2, non-peripheral) or an amino group (3 peripheral). The grafting is achieved via the formation of an amide bond between the carboxylic acid of the silica nanoparticles and the amino group of the phthalocyanine complexes. The hybrid nanoparticles retained the amorphous nature of silica nanoparticles after conjugation. A slight decrease in fluorescence and a general improvement in triplet quantum yields compared to free Pcs were observed. Triplet lifetimes for 2-SiNPs and 3-SiNPs also improved when compared to the free phthalocyanine. The changes in singlet oxygen quantum yields upon conjugation were minimal.
- Full Text:
- Date Issued: 2014
- Authors: Fashina, Adebayo , Antunes, Edith M , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193844 , vital:45399 , xlink:href="https://doi.org/10.1142/S1088424614500138"
- Description: In this study, we report on the covalent linking of carboxylic acid functionalized silica nanoparticles with zinc phthalocyanine mono-substituted non-peripherally and peripherally with either a 4-amino phenoxy (1, peripheral and 2, non-peripheral) or an amino group (3 peripheral). The grafting is achieved via the formation of an amide bond between the carboxylic acid of the silica nanoparticles and the amino group of the phthalocyanine complexes. The hybrid nanoparticles retained the amorphous nature of silica nanoparticles after conjugation. A slight decrease in fluorescence and a general improvement in triplet quantum yields compared to free Pcs were observed. Triplet lifetimes for 2-SiNPs and 3-SiNPs also improved when compared to the free phthalocyanine. The changes in singlet oxygen quantum yields upon conjugation were minimal.
- Full Text:
- Date Issued: 2014
A Flexible Approach for the Application of Immersive Audio to an Installation Performance:
- Gurdan, Robby, Foss, Richard
- Authors: Gurdan, Robby , Foss, Richard
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426732 , vital:72387 , https://patentimages.storage.googleapis.com/28/4a/94/1113bd7074ad90/US8862755.pdf /
- Description: An apparatus for modifying a command message (CMD) received from a source apparatus to control a target device parameter of a target apparatus within a digital multimedia network, wherein a hierarchical parameter address (HPA) or a parameter value contained in said command message (CMD) is changed according to at least one change script to provide a modified command message (CMD′).
- Full Text:
- Date Issued: 2014
- Authors: Gurdan, Robby , Foss, Richard
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426732 , vital:72387 , https://patentimages.storage.googleapis.com/28/4a/94/1113bd7074ad90/US8862755.pdf /
- Description: An apparatus for modifying a command message (CMD) received from a source apparatus to control a target device parameter of a target apparatus within a digital multimedia network, wherein a hierarchical parameter address (HPA) or a parameter value contained in said command message (CMD) is changed according to at least one change script to provide a modified command message (CMD′).
- Full Text:
- Date Issued: 2014
A new approach to obesity for health journalism: fit not fat
- Authors: Dugmore, Harry
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158620 , vital:40212 , https://hdl.handle.net/10520/EJC159484
- Description: Health journalism is a complicated beat. The science is easy to get wrong, and the tone and tenor of the reporting needs careful attention. Coverage of obesity is even more fraught. Early insights from an on-going research project by the Discovery Centre for Health Journalism suggests that not only is most journalism about obesity not helping - some reporting may inadvertently be making the situation worse. This needs to change. There is too much at stake for journalism about food, fat and fitness to be anything less than impactful and effective.
- Full Text:
- Date Issued: 2014
- Authors: Dugmore, Harry
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158620 , vital:40212 , https://hdl.handle.net/10520/EJC159484
- Description: Health journalism is a complicated beat. The science is easy to get wrong, and the tone and tenor of the reporting needs careful attention. Coverage of obesity is even more fraught. Early insights from an on-going research project by the Discovery Centre for Health Journalism suggests that not only is most journalism about obesity not helping - some reporting may inadvertently be making the situation worse. This needs to change. There is too much at stake for journalism about food, fat and fitness to be anything less than impactful and effective.
- Full Text:
- Date Issued: 2014
A Note on the (Continued) Ability of the Yield Curve to Forecast Economic Downturns in South Africa
- Authors: Botha, Ferdi , Keeton, Gavin
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/395994 , vital:69142 , xlink:href="https://doi.org/10.1111/saje.12053"
- Description: In 2002-2003, the South African yield spread falsely signalled a downswing that never materialised. This paper provides two reasons for this false signal. First, while the Reserve Bank never actually officially declared the start of a downswing, by alternative measures a downswing did actually occur. It is this severe weakness in economic activity at that time that the yield curve pointed to. Second, short-term interest rates in 2003 were higher than they should have been because of a mistake made in measuring consumer price inflation. Because South Africa had recently introduced an inflation-targeting regime, policy interest rates were, as a result of this error, kept too high for too long. This policy mistake was rectified as soon as the error in the Consumer Price Index was discovered. Thus, the yield curve in 2003 pointed to the reality that short-term interest rates were too high and risked pushing the economy into full blown recession. This is demonstrated by the fact that it was a fall in long bond interest rates that caused the yield spread to turn negative, indicating expectations that short-term interest rates would need to be cut – as indeed they were.
- Full Text:
- Date Issued: 2014
- Authors: Botha, Ferdi , Keeton, Gavin
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/395994 , vital:69142 , xlink:href="https://doi.org/10.1111/saje.12053"
- Description: In 2002-2003, the South African yield spread falsely signalled a downswing that never materialised. This paper provides two reasons for this false signal. First, while the Reserve Bank never actually officially declared the start of a downswing, by alternative measures a downswing did actually occur. It is this severe weakness in economic activity at that time that the yield curve pointed to. Second, short-term interest rates in 2003 were higher than they should have been because of a mistake made in measuring consumer price inflation. Because South Africa had recently introduced an inflation-targeting regime, policy interest rates were, as a result of this error, kept too high for too long. This policy mistake was rectified as soon as the error in the Consumer Price Index was discovered. Thus, the yield curve in 2003 pointed to the reality that short-term interest rates were too high and risked pushing the economy into full blown recession. This is demonstrated by the fact that it was a fall in long bond interest rates that caused the yield spread to turn negative, indicating expectations that short-term interest rates would need to be cut – as indeed they were.
- Full Text:
- Date Issued: 2014
A promising biological control agent for the invasive alien plant, Pereskia aculeata Miller (Cactaceae), in South Africa
- Paterson, Iain D, Mdodana, Lumka A, Mpekula, Ongezwa, Mabunda, Bheki D, Hill, Martin P
- Authors: Paterson, Iain D , Mdodana, Lumka A , Mpekula, Ongezwa , Mabunda, Bheki D , Hill, Martin P
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416806 , vital:71387 , xlink:href="https://doi.org/10.1080/09583157.2014.919439"
- Description: Pereskia aculeata Miller (Cactaceae) is an invasive alien plant from Central and South America that has become a problematic environmental weed in South Africa. A potential biological control agent, the stem-wilter, Catorhintha schaffneri Brailovsky and Garcia (Coreidae), was collected in southern Brazil and imported into quarantine in South Africa. Field host range data suggested that C. schaffneri has a host range restricted to P. aculeata. No-choice nymph survival tests were then conducted on 27 test plant species in 9 families. Survival to the adult stage was only recorded on P. aculeata and the closely related Pereskia grandifolia Haw. (Cactaceae). Mortality was significantly higher on P. grandifolia with only 3% of the nymphs reaching the adult stage compared with 74% on P. aculeata indicating that P. aculeata is the primary host plant. P. grandifolia is native in South America and is of no agricultural importance in South Africa so any feeding on P. grandifolia in South Africa would have no negative environmental or economic consequences. In other tests, adult survival on P. aculeata [25.8 days (SE ± 3.74)] was significantly longer than on other test plant species [4.3 days (SE ± 0.36)] further confirming the host specificity of the species. Impact studies conducted in quarantine indicated that C. schaffneri is damaging to P. aculeata, significantly reducing the number of leaves and the shoot lengths of plants, even at relatively low insect densities. C. schaffneri is safe for release in South Africa and is likely to be a damaging and effective agent.
- Full Text:
- Date Issued: 2014
- Authors: Paterson, Iain D , Mdodana, Lumka A , Mpekula, Ongezwa , Mabunda, Bheki D , Hill, Martin P
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/416806 , vital:71387 , xlink:href="https://doi.org/10.1080/09583157.2014.919439"
- Description: Pereskia aculeata Miller (Cactaceae) is an invasive alien plant from Central and South America that has become a problematic environmental weed in South Africa. A potential biological control agent, the stem-wilter, Catorhintha schaffneri Brailovsky and Garcia (Coreidae), was collected in southern Brazil and imported into quarantine in South Africa. Field host range data suggested that C. schaffneri has a host range restricted to P. aculeata. No-choice nymph survival tests were then conducted on 27 test plant species in 9 families. Survival to the adult stage was only recorded on P. aculeata and the closely related Pereskia grandifolia Haw. (Cactaceae). Mortality was significantly higher on P. grandifolia with only 3% of the nymphs reaching the adult stage compared with 74% on P. aculeata indicating that P. aculeata is the primary host plant. P. grandifolia is native in South America and is of no agricultural importance in South Africa so any feeding on P. grandifolia in South Africa would have no negative environmental or economic consequences. In other tests, adult survival on P. aculeata [25.8 days (SE ± 3.74)] was significantly longer than on other test plant species [4.3 days (SE ± 0.36)] further confirming the host specificity of the species. Impact studies conducted in quarantine indicated that C. schaffneri is damaging to P. aculeata, significantly reducing the number of leaves and the shoot lengths of plants, even at relatively low insect densities. C. schaffneri is safe for release in South Africa and is likely to be a damaging and effective agent.
- Full Text:
- Date Issued: 2014
A reflection on the use of case studies as a methodology for social learning research in sub Saharan Africa
- Cundill, Georgina, Lotz-Sisitka, Heila, 1965-, Mukute, Mutizwa, Ali, Million Belay, Shackleton, Sheona E, Kulundu-Bolus, Injairu M
- Authors: Cundill, Georgina , Lotz-Sisitka, Heila, 1965- , Mukute, Mutizwa , Ali, Million Belay , Shackleton, Sheona E , Kulundu-Bolus, Injairu M
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/182832 , vital:43884 , xlink:href="https://doi.org/10.1016/j.njas.2013.04.001"
- Description: A recent review has highlighted that the methodology most commonly employed to research social learning has been the individual case study. We draw on four examples of social learning research in the environmental and sustainability sciences from sub-Saharan Africa to reflect on possible reasons behind the preponderance of case study research in this field, and to identify common elements that may be significant for social learning research more generally. We find that a common interest in change oriented social learning, and therefore processes of change, makes case studies a necessary approach because long term process analyses are required that are sensitive to social-ecological contexts. Common elements of the examples reflected upon included: a focus on initiating, tracking and/or understanding a process of change toward sustainability; long term research; an action research agenda that involves reflecting on data with research participants; and temporal, process based analysis of data coupled with in-depth theoretical analysis. This paper highlights that there is significant scope for exploratory research that compares case studies of social learning research to generate a deeper understanding of social learning processes, and their relationship to human agency and societal change.
- Full Text:
- Date Issued: 2014
- Authors: Cundill, Georgina , Lotz-Sisitka, Heila, 1965- , Mukute, Mutizwa , Ali, Million Belay , Shackleton, Sheona E , Kulundu-Bolus, Injairu M
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/182832 , vital:43884 , xlink:href="https://doi.org/10.1016/j.njas.2013.04.001"
- Description: A recent review has highlighted that the methodology most commonly employed to research social learning has been the individual case study. We draw on four examples of social learning research in the environmental and sustainability sciences from sub-Saharan Africa to reflect on possible reasons behind the preponderance of case study research in this field, and to identify common elements that may be significant for social learning research more generally. We find that a common interest in change oriented social learning, and therefore processes of change, makes case studies a necessary approach because long term process analyses are required that are sensitive to social-ecological contexts. Common elements of the examples reflected upon included: a focus on initiating, tracking and/or understanding a process of change toward sustainability; long term research; an action research agenda that involves reflecting on data with research participants; and temporal, process based analysis of data coupled with in-depth theoretical analysis. This paper highlights that there is significant scope for exploratory research that compares case studies of social learning research to generate a deeper understanding of social learning processes, and their relationship to human agency and societal change.
- Full Text:
- Date Issued: 2014
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
Advantages of using development models of the carrion beetles Thanatophilus micans (Fabricius) and T. mutilatus (Castelneau)(Coleoptera Silphidae) for estimating minimum post mortem intervals, verified with case data
- Ridgeway, Jaryd A, Midgley, John M, Collett, Isabel J, Villet, Martin H
- Authors: Ridgeway, Jaryd A , Midgley, John M , Collett, Isabel J , Villet, Martin H
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441737 , vital:73911 , https://doi.org/10.1007/s00414-013-0865-0
- Description: Some beetles are as useful as blow flies for estimating the minimum post mortem interval (PMImin) or time since death. Examples include Thanatophilus micans (Fabricius) and Thanatophilus mutilatus (Castelneau), two geographically and ecologically overlapping African beetles. Molecular means of identifying these species, descriptions of their natural history, thermal summation models for the development of each species, and a case in which T. micans was recovered are presented. These beetles colonise bodies soon after death, their development spans more time than that of flies, and they may be little affected by maggot-generated heat. From an experimental perspective, they can be reared individually, which allows the identification of sick individuals and has analytical advantages relative to fly larvae that must be reared in groups. Estimating minimum post mortem intervals for both species using the case data strongly suggests that developmental models parameterised for one species should not be used to make forensic estimates for closely related species for which no specific model is available and emphasises the need for correct identifications.
- Full Text:
- Date Issued: 2014
- Authors: Ridgeway, Jaryd A , Midgley, John M , Collett, Isabel J , Villet, Martin H
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441737 , vital:73911 , https://doi.org/10.1007/s00414-013-0865-0
- Description: Some beetles are as useful as blow flies for estimating the minimum post mortem interval (PMImin) or time since death. Examples include Thanatophilus micans (Fabricius) and Thanatophilus mutilatus (Castelneau), two geographically and ecologically overlapping African beetles. Molecular means of identifying these species, descriptions of their natural history, thermal summation models for the development of each species, and a case in which T. micans was recovered are presented. These beetles colonise bodies soon after death, their development spans more time than that of flies, and they may be little affected by maggot-generated heat. From an experimental perspective, they can be reared individually, which allows the identification of sick individuals and has analytical advantages relative to fly larvae that must be reared in groups. Estimating minimum post mortem intervals for both species using the case data strongly suggests that developmental models parameterised for one species should not be used to make forensic estimates for closely related species for which no specific model is available and emphasises the need for correct identifications.
- Full Text:
- Date Issued: 2014
An Associative Shared Memory Approach to Audio Connection Management
- Eales, Andrew, Foss, Richard
- Authors: Eales, Andrew , Foss, Richard
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426841 , vital:72395 , https://www.aes.org/e-lib/browse.cfm?elib=17539
- Description: A distributed, associative memory that advertises audio streams and represents audio connections between networked audio devices is described. Characteristic features of a shared, associative memory are discussed, and three parameter-based models that represent audio signals and audio connections are introduced. Connection management is then discussed with reference to a distributed, associative memory environment. This environment allows changes made to audio connections to be automatically propagated to all networked devices, while also eliminating potential race conditions between connection requests. Additionally, connection management applications can be shared between different networked devices and controllers.
- Full Text:
- Date Issued: 2014
- Authors: Eales, Andrew , Foss, Richard
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426841 , vital:72395 , https://www.aes.org/e-lib/browse.cfm?elib=17539
- Description: A distributed, associative memory that advertises audio streams and represents audio connections between networked audio devices is described. Characteristic features of a shared, associative memory are discussed, and three parameter-based models that represent audio signals and audio connections are introduced. Connection management is then discussed with reference to a distributed, associative memory environment. This environment allows changes made to audio connections to be automatically propagated to all networked devices, while also eliminating potential race conditions between connection requests. Additionally, connection management applications can be shared between different networked devices and controllers.
- Full Text:
- Date Issued: 2014
An exploration of geolocation and traffic visualisation using network flows
- Pennefather, Sean, Irwin, Barry V W
- Authors: Pennefather, Sean , Irwin, Barry V W
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429597 , vital:72625 , 10.1109/ISSA.2014.6950
- Description: A network flow is a data record that represents characteristics associated with a unidirectional stream of packets transmitted between two hosts using an IP layer protocol. As a network flow only represents statistics relating to the data transferred in the stream, the effectiveness of utilizing network flows for traffic visualization to aid in cyber defense is not immediately apparent and needs further exploration. The goal of this research is to explore the use of network flows for data visualization and geolocation.
- Full Text:
- Date Issued: 2014
- Authors: Pennefather, Sean , Irwin, Barry V W
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429597 , vital:72625 , 10.1109/ISSA.2014.6950
- Description: A network flow is a data record that represents characteristics associated with a unidirectional stream of packets transmitted between two hosts using an IP layer protocol. As a network flow only represents statistics relating to the data transferred in the stream, the effectiveness of utilizing network flows for traffic visualization to aid in cyber defense is not immediately apparent and needs further exploration. The goal of this research is to explore the use of network flows for data visualization and geolocation.
- Full Text:
- Date Issued: 2014
An improved larval diet for commercial mass rearing of the false codling moth, Thaumatotibia leucotreta (Meyrick)(Lepidoptera: Tortricidae)
- Moore, Sean D, Richards, G I, Chambers, Craig B, Hendry, Donald A
- Authors: Moore, Sean D , Richards, G I , Chambers, Craig B , Hendry, Donald A
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452206 , vital:75111 , https://hdl.handle.net/10520/EJC150955
- Description: False codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera:Tortricidae), is endemic to sub-Saharan Africa (Newton 1998). It is a pest of citrus (Newton 1998), stone fruit (Daiber 1978), macadamias (La Croix and Thindwa 1986), avocados (Erichsen and Schoeman 1992) and various other agricultural crops. All available control methods were recently reviewed by Moore and Hattingh (2012). Included amongst these is the use of granulovirus (Cryptophlebia leucotreta granulovirus (CrleGV)) sprays, inundative releases of egg parasitoids and the sterile insect technique (SIT). All of these require production of large numbers of T. leucotreta. CrleGV and the egg parasitoid, Trichogrammatoidea cryptophlebiae (Nagaraja) (Hymenoptera: Trichogrammatidae), are produced in vivo (Moore et al. 2011) and for SIT, the sterilized adult male moth is the product (Hofmeyr et al. 2005).
- Full Text:
- Date Issued: 2014
- Authors: Moore, Sean D , Richards, G I , Chambers, Craig B , Hendry, Donald A
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452206 , vital:75111 , https://hdl.handle.net/10520/EJC150955
- Description: False codling moth, Thaumatotibia leucotreta (Meyrick) (Lepidoptera:Tortricidae), is endemic to sub-Saharan Africa (Newton 1998). It is a pest of citrus (Newton 1998), stone fruit (Daiber 1978), macadamias (La Croix and Thindwa 1986), avocados (Erichsen and Schoeman 1992) and various other agricultural crops. All available control methods were recently reviewed by Moore and Hattingh (2012). Included amongst these is the use of granulovirus (Cryptophlebia leucotreta granulovirus (CrleGV)) sprays, inundative releases of egg parasitoids and the sterile insect technique (SIT). All of these require production of large numbers of T. leucotreta. CrleGV and the egg parasitoid, Trichogrammatoidea cryptophlebiae (Nagaraja) (Hymenoptera: Trichogrammatidae), are produced in vivo (Moore et al. 2011) and for SIT, the sterilized adult male moth is the product (Hofmeyr et al. 2005).
- Full Text:
- Date Issued: 2014
An Interview with Ken Barris:
- Authors: Marais, Mike
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144050 , vital:38306 , DOI: 10.4314/eia.v41i1.9
- Description: Ken Barris was born in Port Elizabeth and lives in Cape Town, where he works at the Cape Peninsula University of Technology. His writing includes two collections of poetry, a collection of short stories, and five novels, the most recent being What Kind of Child (2006) and Life Underwater (2012). His work has been translated into Turkish, Danish, German and Slovenian, and poetry and short fiction have appeared in various anthologies. More recently, he has turned to writing for academic journals. His research interests are postapartheid fiction and language education.
- Full Text:
- Date Issued: 2014
- Authors: Marais, Mike
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144050 , vital:38306 , DOI: 10.4314/eia.v41i1.9
- Description: Ken Barris was born in Port Elizabeth and lives in Cape Town, where he works at the Cape Peninsula University of Technology. His writing includes two collections of poetry, a collection of short stories, and five novels, the most recent being What Kind of Child (2006) and Life Underwater (2012). His work has been translated into Turkish, Danish, German and Slovenian, and poetry and short fiction have appeared in various anthologies. More recently, he has turned to writing for academic journals. His research interests are postapartheid fiction and language education.
- 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
Application of carbon black and iron phthalocyanine composites in bioelectricity production at a brewery wastewater fed microbial fuel cell
- Mshoperi, Edith, Fogel, Ronen, Limson, Janice
- Authors: Mshoperi, Edith , Fogel, Ronen , Limson, Janice
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431050 , vital:72740 , xlink:href="https://doi.org/10.1016/j.electacta.2013.11.01"
- Description: Aerobic cathode microbial fuel cells (MFCs) have been widely researched to provide bioremediation of wastewaters, coupled to sustainable energy production. In order to effectively accomplish this aim, suitable catalysts and catalyst supports for oxygen reduction reaction (ORR) are required. While iron phthaloycanine (FePc), supported on multi-walled carbon nanotubes has previously been studied for this function, cost of industrial production may hinder this. Importantly, this study examines the use of several available grades of carbon black for their relative suitability to perform as supports for FePc in MFC formats. Voltammetric studies showed that the different grades of carbon black provided varying lowering of the ORR overpotential, between ∼160 and ∼270 mV relative to unmodified GCEs, and an optimum grade (N326) was selected for further study. Carbon black/FePC composite electrodes exhibited comparable lowering of the ORR overpotential (606 mV) to potentials previously reported to nanotube/FePc composites (620 mV), as well as lowered charge-transfer resistance compared to electrodes solely modified with FePc. When applied as cathode modifiers in dual chambered MFCs utilising Enterobacter cloacae, the combined use of carbon black and FePc provided greater power densities than either alone; composite electrodes obtaining ∼400% power density, compared to unmodified electrodes. Modification of the anode with carbon black further increased power density, generating power densities an order of magnitude larger than those obtained at unmodified electrodes. The ability of beer brewery waste water (BBWW) to generate power at these modified surfaces yielded permissible power densities (∼40% that of reinforced clostridial media). Differences observed, in particular under agitation, are attributed to variations in nutrient content and nutrient complexity, between the two fuel substrates.
- Full Text:
- Date Issued: 2014
- Authors: Mshoperi, Edith , Fogel, Ronen , Limson, Janice
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431050 , vital:72740 , xlink:href="https://doi.org/10.1016/j.electacta.2013.11.01"
- Description: Aerobic cathode microbial fuel cells (MFCs) have been widely researched to provide bioremediation of wastewaters, coupled to sustainable energy production. In order to effectively accomplish this aim, suitable catalysts and catalyst supports for oxygen reduction reaction (ORR) are required. While iron phthaloycanine (FePc), supported on multi-walled carbon nanotubes has previously been studied for this function, cost of industrial production may hinder this. Importantly, this study examines the use of several available grades of carbon black for their relative suitability to perform as supports for FePc in MFC formats. Voltammetric studies showed that the different grades of carbon black provided varying lowering of the ORR overpotential, between ∼160 and ∼270 mV relative to unmodified GCEs, and an optimum grade (N326) was selected for further study. Carbon black/FePC composite electrodes exhibited comparable lowering of the ORR overpotential (606 mV) to potentials previously reported to nanotube/FePc composites (620 mV), as well as lowered charge-transfer resistance compared to electrodes solely modified with FePc. When applied as cathode modifiers in dual chambered MFCs utilising Enterobacter cloacae, the combined use of carbon black and FePc provided greater power densities than either alone; composite electrodes obtaining ∼400% power density, compared to unmodified electrodes. Modification of the anode with carbon black further increased power density, generating power densities an order of magnitude larger than those obtained at unmodified electrodes. The ability of beer brewery waste water (BBWW) to generate power at these modified surfaces yielded permissible power densities (∼40% that of reinforced clostridial media). Differences observed, in particular under agitation, are attributed to variations in nutrient content and nutrient complexity, between the two fuel substrates.
- Full Text:
- Date Issued: 2014
Applications of lead phthalocyanines embedded in electrospun fibers for the photoinactivation of Escherichia coli in water
- Osifeko, Olawale L, Nyokong, Tebello
- Authors: Osifeko, Olawale L , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/189898 , vital:44945 , xlink:href="https://doi.org/10.1016/j.dyepig.2014.05.010"
- Description: Lead (II) pyridyloxyphthalocyanine (PbTpyPc) and its quaternized form (PbTepyPc) were synthesized and the photophysical behavior examined. Low fluorescence quantum yields (ΦF) of 0.01 and 0.02 were observed for PbTepyPc and PbTpyPc, respectively. The singlet oxygen quantum yields (ΦΔ) were 0.60 and 0.68, for PbTepyPc and PbTpyPc, respectively using DPBF as a quencher in DMF. Singlet oxygen production of the embedded sensitizers in electrospun fiber were quantified using ADMA and were found to be ΦΔ = 0.41 and ΦΔ = 0.21 for PbTepyPc and PbTpyPc, respectively. Photodynamic inactivation of Escherichia coli (E. coli) with the quaternized photosensitizer at 5 μM, totally inactivated the E. coli (with log CFU = 10 decrease). Only 0.4 log CFU decrease was obtained with PbTpyPc. The embedded non-quaternized photosensitizer (PbTpyPc) was less active on the gram negative bacteria but the quaternized photosensitizer (PbTepyPc) was effective towards inactivation of E. coli.
- Full Text:
- Date Issued: 2014
- Authors: Osifeko, Olawale L , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/189898 , vital:44945 , xlink:href="https://doi.org/10.1016/j.dyepig.2014.05.010"
- Description: Lead (II) pyridyloxyphthalocyanine (PbTpyPc) and its quaternized form (PbTepyPc) were synthesized and the photophysical behavior examined. Low fluorescence quantum yields (ΦF) of 0.01 and 0.02 were observed for PbTepyPc and PbTpyPc, respectively. The singlet oxygen quantum yields (ΦΔ) were 0.60 and 0.68, for PbTepyPc and PbTpyPc, respectively using DPBF as a quencher in DMF. Singlet oxygen production of the embedded sensitizers in electrospun fiber were quantified using ADMA and were found to be ΦΔ = 0.41 and ΦΔ = 0.21 for PbTepyPc and PbTpyPc, respectively. Photodynamic inactivation of Escherichia coli (E. coli) with the quaternized photosensitizer at 5 μM, totally inactivated the E. coli (with log CFU = 10 decrease). Only 0.4 log CFU decrease was obtained with PbTpyPc. The embedded non-quaternized photosensitizer (PbTpyPc) was less active on the gram negative bacteria but the quaternized photosensitizer (PbTepyPc) was effective towards inactivation of E. coli.
- Full Text:
- Date Issued: 2014
Apprehension of bias and the spectacle of the fair-minded observer: a survey of recent commonwealth and South African decisions on pre-judgment
- Okpaluba, Chuks, Juma, Laurence
- Authors: Okpaluba, Chuks , Juma, Laurence
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/126107 , vital:35850 , http://specjuris.ufh.ac.za/apprehension-bias-and-spectacle-fair-minded-observer-survey-recent-commonwealth-and-south-african
- Description: A perusal of contemporary Commonwealth case law reveals that allegations of bias or apprehension of bias tend to revolve around the pecuniary or other interests of the Judge arising from kinship, previous relationship, or association with party or counsel.1Apparent bias could also be inferred from the judge‘s conduct or utterances, especially, his/her criticisms or cumulative criticisms of a party during proceedings or in adjudication.2In other instances, a judge‘s previous knowledge or association with the case in court, or of an important witness, may disqualify him/her from sitting or passing judgment in the case.3
- Full Text:
- Date Issued: 2014
- Authors: Okpaluba, Chuks , Juma, Laurence
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/126107 , vital:35850 , http://specjuris.ufh.ac.za/apprehension-bias-and-spectacle-fair-minded-observer-survey-recent-commonwealth-and-south-african
- Description: A perusal of contemporary Commonwealth case law reveals that allegations of bias or apprehension of bias tend to revolve around the pecuniary or other interests of the Judge arising from kinship, previous relationship, or association with party or counsel.1Apparent bias could also be inferred from the judge‘s conduct or utterances, especially, his/her criticisms or cumulative criticisms of a party during proceedings or in adjudication.2In other instances, a judge‘s previous knowledge or association with the case in court, or of an important witness, may disqualify him/her from sitting or passing judgment in the case.3
- Full Text:
- Date Issued: 2014
Argumentative and trustworthy scholars
- McKenna, Sioux, Boughey, Chrissie
- Authors: McKenna, Sioux , Boughey, Chrissie
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187216 , vital:44580 , xlink:href="https://doi.org/10.1080/13562517.2014.934351"
- Description: Research-intensive universities, such as the Russell Group in the UK, the Ivy League Colleges in the USA and the Sandstone Universities in Australia, enjoy particular status in the higher education landscape. They are, however, also often associated with social elitism and selectivity, and this has led to critique as higher education systems seek to widen access. This article looks at how academic staff are discursively constructed in five such institutions in South Africa through an analysis of documentation submitted as part of a national review. Three interrelated discourses are identified: a discourse of ‘staff as scholars’ whereby research is privileged over teaching, a discourse of ‘academic argumentation’ whereby a critical disposition is valued and is called upon by academics to resist development initiatives and a discourse of ‘trust’ whereby it is assumed that academics share a value system and should thus be trusted to undertake quality teaching without interference.
- Full Text:
- Date Issued: 2014
- Authors: McKenna, Sioux , Boughey, Chrissie
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187216 , vital:44580 , xlink:href="https://doi.org/10.1080/13562517.2014.934351"
- Description: Research-intensive universities, such as the Russell Group in the UK, the Ivy League Colleges in the USA and the Sandstone Universities in Australia, enjoy particular status in the higher education landscape. They are, however, also often associated with social elitism and selectivity, and this has led to critique as higher education systems seek to widen access. This article looks at how academic staff are discursively constructed in five such institutions in South Africa through an analysis of documentation submitted as part of a national review. Three interrelated discourses are identified: a discourse of ‘staff as scholars’ whereby research is privileged over teaching, a discourse of ‘academic argumentation’ whereby a critical disposition is valued and is called upon by academics to resist development initiatives and a discourse of ‘trust’ whereby it is assumed that academics share a value system and should thus be trusted to undertake quality teaching without interference.
- Full Text:
- Date Issued: 2014
Assessment of the long-term response to rehabilitation of two wetlands in KwaZulu-Natal, South Africa:
- Cowden, Craig, Kotze, Donovan C, Ellery, William F N, Sieben, E J J
- Authors: Cowden, Craig , Kotze, Donovan C , Ellery, William F N , Sieben, E J J
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144431 , vital:38345 , DOI: 10.2989/16085914.2014.954518
- Description: Assessing the ecological outcomes of wetland rehabilitation activities is an important need recognised by the ‘Working for Wetlands’ programme in South Africa. An assessment of ecological response was conducted in the Killarney and Kruisfontein wetlands, KwaZulu-Natal, in 2005 prior to rehabilitation in 2006, and again in 2011 and 2012, respectively, following rehabilitation. The assessment criteria included an evaluation of changes in ecological integrity, the supply of ecosystem services, and vegetation composition. Improvements in hydrological and geomorphic integrity were recorded in both wetlands, resulting in improved ecosystem delivery.
- Full Text:
- Date Issued: 2014
- Authors: Cowden, Craig , Kotze, Donovan C , Ellery, William F N , Sieben, E J J
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144431 , vital:38345 , DOI: 10.2989/16085914.2014.954518
- Description: Assessing the ecological outcomes of wetland rehabilitation activities is an important need recognised by the ‘Working for Wetlands’ programme in South Africa. An assessment of ecological response was conducted in the Killarney and Kruisfontein wetlands, KwaZulu-Natal, in 2005 prior to rehabilitation in 2006, and again in 2011 and 2012, respectively, following rehabilitation. The assessment criteria included an evaluation of changes in ecological integrity, the supply of ecosystem services, and vegetation composition. Improvements in hydrological and geomorphic integrity were recorded in both wetlands, resulting in improved ecosystem delivery.
- Full Text:
- Date Issued: 2014