The Seduction of Ash: " Mia Couto's" The Day Mabata-bata Exploded" and" The Bird-Dreaming Baobab
- Authors: Njovane, Thandokazi
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142702 , vital:38103 , 10.4314/eia.v41i2.2
- Description: Chesca Long-Innes argues that Mia Couto's installation of the fantastic in his short story collection, Voices Made Night, may best be understood "not so much as a product of any 'magical realist' poetics, but as 'naturalised,' or motivated as a function of the collective neurosis of a [Mozambican] society traumatised by its continuing history of poverty and extreme violence". Couto's use of the fantastic, she adds, encompasses both empirical and psychic reality, and both are characterised by instability and elusiveness. The collection, she then maintains, constitutes a reinvention or reimagining of subjective realities constructed and perpetuated by the social trauma underpinning what she terms the "psycho-pathology of post-colonial Mozambique, in which the society as a whole is [. . .] caught in the grip of a profound depression or melancholia".
- Full Text:
- Authors: Njovane, Thandokazi
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142702 , vital:38103 , 10.4314/eia.v41i2.2
- Description: Chesca Long-Innes argues that Mia Couto's installation of the fantastic in his short story collection, Voices Made Night, may best be understood "not so much as a product of any 'magical realist' poetics, but as 'naturalised,' or motivated as a function of the collective neurosis of a [Mozambican] society traumatised by its continuing history of poverty and extreme violence". Couto's use of the fantastic, she adds, encompasses both empirical and psychic reality, and both are characterised by instability and elusiveness. The collection, she then maintains, constitutes a reinvention or reimagining of subjective realities constructed and perpetuated by the social trauma underpinning what she terms the "psycho-pathology of post-colonial Mozambique, in which the society as a whole is [. . .] caught in the grip of a profound depression or melancholia".
- Full Text:
The transformers : journalism education
- Authors: Priscilla Boshoff
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70688 , vital:29689
- Description: Universities are strange places. People come in as one kind of being, and leave quite different. They are places of transformation. One way in which they effect this transformation is to challenge our preconceived notions of the world, and our relationship to it. However, at the same time, universities are also places of privilege and so can be conservative – in the sense of conserving and fostering particular interests in their favour.
- Full Text:
- Authors: Priscilla Boshoff
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70688 , vital:29689
- Description: Universities are strange places. People come in as one kind of being, and leave quite different. They are places of transformation. One way in which they effect this transformation is to challenge our preconceived notions of the world, and our relationship to it. However, at the same time, universities are also places of privilege and so can be conservative – in the sense of conserving and fostering particular interests in their favour.
- Full Text:
The transformers: journalism education
- Authors: Boshoff, Priscilla A
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141911 , vital:38015 , http://journals.co.za/content/rujr/2014/34/EJC159497
- Description: Universities are strange places. People come in as one kind of being, and leave quite different. They are places of transformation. One way in which they effect this transformation is to challenge our preconceived notions of the world, and our relationship to it. However, at the same time, universities are also places of privilege and so can be conservative – in the sense of conserving and fostering particular interests in their favour.
- Full Text:
- Authors: Boshoff, Priscilla A
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141911 , vital:38015 , http://journals.co.za/content/rujr/2014/34/EJC159497
- Description: Universities are strange places. People come in as one kind of being, and leave quite different. They are places of transformation. One way in which they effect this transformation is to challenge our preconceived notions of the world, and our relationship to it. However, at the same time, universities are also places of privilege and so can be conservative – in the sense of conserving and fostering particular interests in their favour.
- Full Text:
Thinking Africa Newsletter: (June 2014)
- Authors: Matthews, Sally
- Date: 2014
- Language: English
- Type: text , article
- Identifier: vital:38065 , http://hdl.handle.net/20.500.12137/23
- Description: Thinking Africa Newsletter (June 2014).
- Full Text:
- Authors: Matthews, Sally
- Date: 2014
- Language: English
- Type: text , article
- Identifier: vital:38065 , http://hdl.handle.net/20.500.12137/23
- Description: Thinking Africa Newsletter (June 2014).
- Full Text:
Thinking Africa Newsletter: (March 2014)
- Authors: Matthews, Sally
- Date: 2014
- Language: English
- Type: text , article
- Identifier: vital:38067 , http://hdl.handle.net/20.500.12137/22
- Description: Thinking Africa Newsletter (March 2014).
- Full Text:
- Authors: Matthews, Sally
- Date: 2014
- Language: English
- Type: text , article
- Identifier: vital:38067 , http://hdl.handle.net/20.500.12137/22
- Description: Thinking Africa Newsletter (March 2014).
- Full Text:
Towards a platform to visualize the state of South Africa's information security
- Swart, Ignus, Irwin, Barry V W, Grobler, Marthie
- Authors: Swart, Ignus , Irwin, Barry V W , Grobler, Marthie
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429688 , vital:72632 , 10.1109/ISSA.2014.6950511
- Description: Attacks via the Internet infrastructure is increasingly becoming a daily occurrence and South Africa is no exception. In response, certain governments have published strategies pertaining to information security on a national level. These policies aim to ensure that critical infrastructure is protected, and that there is a move towards a greater state of information security readiness. This is also the case for South Africa where a variety of policy initiatives have started to gain momentum. While establishing strategy and policy is essential, ensuring its implementation is often difficult and dependent on the availability of resources. This is even more so in the case of information security since virtually all standardized security improvement processes start off with specifying that a proper inventory is required of all hardware, software, people and processes. While this may be possible to achieve at an organizational level, it is far more challenging on a national level. In this paper, the authors examine the possibility of making use of available data sources to achieve inventory of infrastructure on a national level and to visualize the state of a country's information security in at least a partial manner.
- Full Text:
- Authors: Swart, Ignus , Irwin, Barry V W , Grobler, Marthie
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429688 , vital:72632 , 10.1109/ISSA.2014.6950511
- Description: Attacks via the Internet infrastructure is increasingly becoming a daily occurrence and South Africa is no exception. In response, certain governments have published strategies pertaining to information security on a national level. These policies aim to ensure that critical infrastructure is protected, and that there is a move towards a greater state of information security readiness. This is also the case for South Africa where a variety of policy initiatives have started to gain momentum. While establishing strategy and policy is essential, ensuring its implementation is often difficult and dependent on the availability of resources. This is even more so in the case of information security since virtually all standardized security improvement processes start off with specifying that a proper inventory is required of all hardware, software, people and processes. While this may be possible to achieve at an organizational level, it is far more challenging on a national level. In this paper, the authors examine the possibility of making use of available data sources to achieve inventory of infrastructure on a national level and to visualize the state of a country's information security in at least a partial manner.
- Full Text:
Towards a Sandbox for the Deobfuscation and Dissection of PHP Malware
- Wrench, Peter M, Irwin, Barry V W
- Authors: Wrench, Peter M , Irwin, Barry V W
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429700 , vital:72633 , 10.1109/ISSA.2014.6950504
- Description: The creation and proliferation of PHP-based Remote Access Trojans (or web shells) used in both the compromise and post exploitation of web platforms has fuelled research into automated methods of dissecting and analysing these shells. Current malware tools disguise themselves by making use of obfuscation techniques designed to frustrate any efforts to dissect or reverse engineer the code. Advanced code engineering can even cause malware to behave differently if it detects that it is not running on the system for which it was originally targeted. To combat these defensive techniques, this paper presents a sandbox-based environment that aims to accurately mimic a vulnerable host and is capable of semi-automatic semantic dissection and syntactic deobfuscation of PHP code.
- Full Text:
- Authors: Wrench, Peter M , Irwin, Barry V W
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429700 , vital:72633 , 10.1109/ISSA.2014.6950504
- Description: The creation and proliferation of PHP-based Remote Access Trojans (or web shells) used in both the compromise and post exploitation of web platforms has fuelled research into automated methods of dissecting and analysing these shells. Current malware tools disguise themselves by making use of obfuscation techniques designed to frustrate any efforts to dissect or reverse engineer the code. Advanced code engineering can even cause malware to behave differently if it detects that it is not running on the system for which it was originally targeted. To combat these defensive techniques, this paper presents a sandbox-based environment that aims to accurately mimic a vulnerable host and is capable of semi-automatic semantic dissection and syntactic deobfuscation of PHP code.
- Full Text:
Towards building an indigenous knowledge platform to enable culturally-sensitive education underpinned by technological pedagogical and content knowledge (TPACK)
- Ntšekhe, Mathe, Terzoli, Alfredo, Thinyane, Mamello
- Authors: Ntšekhe, Mathe , Terzoli, Alfredo , Thinyane, Mamello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431424 , vital:72773 , http://proceedings.e-skillsconference.org/2014/e-skills275-284Ntsekhe821.pdf
- Description: The everyday use of Information and Communication Technologies (ICTs) is ingrained to the fabric of today’s society. A question open for debate is whether this use is or can be optimized to engender authentic solutions, which are aligned to the natural environment of the people? In this paper, we examine at the question from the vantage point of ed-ucating the rural African child. We engage with the sub-question: can ICTs facilitate education grounded in people's own realities, especially those of the marginalized rural poor? We believe this is possible under specific conditions, which include making Indigenous Knowledge (IK) readily available. We propose building an ICT platform that allows injec-tion of IK into the education process: develop a solution that valorizes IK, but also supports efforts to use ICTs in education driven by Tech-nology, Pedagogy, and Content Knowledge (TPACK) framework. The main goal of this framework is to facilitate effective teaching with tech-nology. TPACK partially embeds IK within pedagogical knowledge and ‘contexts’ of learning; we argue for explicit inclusion of IK within the framework to complement the other knowledges.
- Full Text:
- Authors: Ntšekhe, Mathe , Terzoli, Alfredo , Thinyane, Mamello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431424 , vital:72773 , http://proceedings.e-skillsconference.org/2014/e-skills275-284Ntsekhe821.pdf
- Description: The everyday use of Information and Communication Technologies (ICTs) is ingrained to the fabric of today’s society. A question open for debate is whether this use is or can be optimized to engender authentic solutions, which are aligned to the natural environment of the people? In this paper, we examine at the question from the vantage point of ed-ucating the rural African child. We engage with the sub-question: can ICTs facilitate education grounded in people's own realities, especially those of the marginalized rural poor? We believe this is possible under specific conditions, which include making Indigenous Knowledge (IK) readily available. We propose building an ICT platform that allows injec-tion of IK into the education process: develop a solution that valorizes IK, but also supports efforts to use ICTs in education driven by Tech-nology, Pedagogy, and Content Knowledge (TPACK) framework. The main goal of this framework is to facilitate effective teaching with tech-nology. TPACK partially embeds IK within pedagogical knowledge and ‘contexts’ of learning; we argue for explicit inclusion of IK within the framework to complement the other knowledges.
- Full Text:
Tracing the ANC’s criticism of South African media: 20 years of democracy
- Authors: Malila, Vanessa
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158661 , vital:40219 , https://hdl.handle.net/10520/EJC159512
- Description: We often forget the strides that have been made in the media industry in South Africa since the end of apartheid and the repressive conditions under which the media industry operated prior to 1994. In the current context of complaints by the ANC about the lack of transformation in the industry and the poor reporting by the mainstream commercial media, the gains in ownership changes and the massive growth of the community media sector in South Africa are sometimes overshadowed. Despite a positive early relationship between the media and the ANC government, things have become progressively more difficult between these two institutions and the criticism from the ANC more vociferous in recent years.
- Full Text:
- Authors: Malila, Vanessa
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158661 , vital:40219 , https://hdl.handle.net/10520/EJC159512
- Description: We often forget the strides that have been made in the media industry in South Africa since the end of apartheid and the repressive conditions under which the media industry operated prior to 1994. In the current context of complaints by the ANC about the lack of transformation in the industry and the poor reporting by the mainstream commercial media, the gains in ownership changes and the massive growth of the community media sector in South Africa are sometimes overshadowed. Despite a positive early relationship between the media and the ANC government, things have become progressively more difficult between these two institutions and the criticism from the ANC more vociferous in recent years.
- Full Text:
Trends in the TD-DFT calculations of porphyrin and phthalocyanine analogs
- Mack, John, Stone, Justin, Nyokong, Tebello
- Authors: Mack, John , Stone, Justin , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193882 , vital:45402 , xlink:href="https://doi.org/10.1142/S108842461450045X"
- Description: In 2005, Kobayashi and coworkers reported trends in the TD-DFT spectra of 17 Zn (II) porphyrinoids [J. Am. Chem. Soc. 2005; 127: 17697] that were analyzed using Michl's perimeter model as part of a study of the anomalous magnetic circular dichroism (MCD) spectroscopy of zinc tetraphenyltetraacenaphthoporphyrin. In recent years, it has become increasingly clear that TD-DFT calculations with the commonly used hybrid B3LYP exchange-correlation functional of the Gaussian software package are problematic in the B-band region of porphyrinoid spectra, since the degree of configurational interaction between the B and higher energy ππ* state appears to be significantly overestimated. The CAM-B3LYP functional is now often preferred for analyzing the optical properties of porphyrinoids, since it includes a long-range correction of the exchange potential, which incorporates an increasing fraction of Hartree–Fock (HF) exchange as the interelectronic separation increases, making it better suited for studying compounds where there is significant charge transfer in the electronic excited states. The trends in the TD-DFT calculations are reexamined with a wider range porphyrinoid compounds including several with pyrazino moieties and are found to provide a closer agreement with the experimental in the B-band region for complexes such as zinc tetraphenylporphyrin and phthalocyanine.
- Full Text:
- Authors: Mack, John , Stone, Justin , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193882 , vital:45402 , xlink:href="https://doi.org/10.1142/S108842461450045X"
- Description: In 2005, Kobayashi and coworkers reported trends in the TD-DFT spectra of 17 Zn (II) porphyrinoids [J. Am. Chem. Soc. 2005; 127: 17697] that were analyzed using Michl's perimeter model as part of a study of the anomalous magnetic circular dichroism (MCD) spectroscopy of zinc tetraphenyltetraacenaphthoporphyrin. In recent years, it has become increasingly clear that TD-DFT calculations with the commonly used hybrid B3LYP exchange-correlation functional of the Gaussian software package are problematic in the B-band region of porphyrinoid spectra, since the degree of configurational interaction between the B and higher energy ππ* state appears to be significantly overestimated. The CAM-B3LYP functional is now often preferred for analyzing the optical properties of porphyrinoids, since it includes a long-range correction of the exchange potential, which incorporates an increasing fraction of Hartree–Fock (HF) exchange as the interelectronic separation increases, making it better suited for studying compounds where there is significant charge transfer in the electronic excited states. The trends in the TD-DFT calculations are reexamined with a wider range porphyrinoid compounds including several with pyrazino moieties and are found to provide a closer agreement with the experimental in the B-band region for complexes such as zinc tetraphenylporphyrin and phthalocyanine.
- Full Text:
Unclogging the wheels: how the shift from politics to law affects Africa's relationship with the international system
- Authors: Juma, Laurence
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/127123 , vital:35958 , https://heinonline.org/HOL/Page?handle=hein.journals/tlcp23amp;div=17amp;g_sent=1amp;casa_token=amp;collection=journals
- Description: Gone are the days when scholars debated whether international law was really law and whether the adjudicatory organs of the international system could effectuate the demands of the international rule of law. 1 This old time debate has, in recent times, given way to temperate and yet decisive acknowledgement of the legal authority of institutions resident within the international system.
- Full Text: false
- Authors: Juma, Laurence
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/127123 , vital:35958 , https://heinonline.org/HOL/Page?handle=hein.journals/tlcp23amp;div=17amp;g_sent=1amp;casa_token=amp;collection=journals
- Description: Gone are the days when scholars debated whether international law was really law and whether the adjudicatory organs of the international system could effectuate the demands of the international rule of law. 1 This old time debate has, in recent times, given way to temperate and yet decisive acknowledgement of the legal authority of institutions resident within the international system.
- Full Text: false
Understanding food security in a perfect storm: an ecosystem services approach
- Poppy, G M, Chiotha, S, Eigenbrod, Felix, Harvey, Celia A, Honza´k, M, Hudson, Malcolm D, Jarvis, A, Madise, Nyovani J, Schreckenberg, Kate, Shackleton, Charlie M, Villa, F, Dawson, Terrence P
- Authors: Poppy, G M , Chiotha, S , Eigenbrod, Felix , Harvey, Celia A , Honza´k, M , Hudson, Malcolm D , Jarvis, A , Madise, Nyovani J , Schreckenberg, Kate , Shackleton, Charlie M , Villa, F , Dawson, Terrence P
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/398423 , vital:69410 , xlink:href="https://doi.org/10.1098/rstb.2012.0288"
- Description: Achieving food security in a ‘perfect storm’ scenario is a grand challenge for society. Climate change and an expanding global population act in concert to make global food security even more complex and demanding. As achieving food security and the millennium development goal (MDG) to eradicate hunger influences the attainment of other MDGs, it is imperative that we offer solutions which are complementary and do not oppose one another. Sustainable intensification of agriculture has been proposed as a way to address hunger while also minimizing further environmental impact. However, the desire to raise productivity and yields has historically led to a degraded environment, reduced biodiversity and a reduction in ecosystem services (ES), with the greatest impacts affecting the poor. This paper proposes that the ES framework coupled with a policy response framework, for example Driver-Pressure-State-Impact-Response (DPSIR), can allow food security to be delivered alongside healthy ecosystems, which provide many other valuable services to humankind. Too often, agro-ecosystems have been considered as separate from other natural ecosystems and insufficient attention has been paid to the way in which services can flow to and from the agro-ecosystem to surrounding ecosystems. Highlighting recent research in a large multi-disciplinary project (ASSETS), we illustrate the ES approach to food security using a case study from the Zomba district of Malawi.
- Full Text:
- Authors: Poppy, G M , Chiotha, S , Eigenbrod, Felix , Harvey, Celia A , Honza´k, M , Hudson, Malcolm D , Jarvis, A , Madise, Nyovani J , Schreckenberg, Kate , Shackleton, Charlie M , Villa, F , Dawson, Terrence P
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/398423 , vital:69410 , xlink:href="https://doi.org/10.1098/rstb.2012.0288"
- Description: Achieving food security in a ‘perfect storm’ scenario is a grand challenge for society. Climate change and an expanding global population act in concert to make global food security even more complex and demanding. As achieving food security and the millennium development goal (MDG) to eradicate hunger influences the attainment of other MDGs, it is imperative that we offer solutions which are complementary and do not oppose one another. Sustainable intensification of agriculture has been proposed as a way to address hunger while also minimizing further environmental impact. However, the desire to raise productivity and yields has historically led to a degraded environment, reduced biodiversity and a reduction in ecosystem services (ES), with the greatest impacts affecting the poor. This paper proposes that the ES framework coupled with a policy response framework, for example Driver-Pressure-State-Impact-Response (DPSIR), can allow food security to be delivered alongside healthy ecosystems, which provide many other valuable services to humankind. Too often, agro-ecosystems have been considered as separate from other natural ecosystems and insufficient attention has been paid to the way in which services can flow to and from the agro-ecosystem to surrounding ecosystems. Highlighting recent research in a large multi-disciplinary project (ASSETS), we illustrate the ES approach to food security using a case study from the Zomba district of Malawi.
- Full Text:
Unsymmetrically substituted nickel triazatetra-benzcorrole and phthalocynanine complexes
- Adegoke, Oluwasesan, Nyokong, Tebello
- Authors: Adegoke, Oluwasesan , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/189818 , vital:44934 , xlink:href="https://doi.org/10.1007/s10895-013-1317-4"
- Description: We report on the design and application of fluorescent nanoprobes based on the covalent linking of L-glutathione-capped CdSe@ZnS quantum dots (QDs) to newly synthesized unsymmetrically substituted nickel mercaptosuccinic acid triazatetra-benzcorrole (3) and phthalocyanine (4) complexes. Fluorescence quenching of the QDs occurred on conjugation to complexes 3 or 4. The nanoprobes were selectively screened in the presence of different cations and Hg2+ showed excellent affinity in “turning ON” the fluorescence of the nanoprobes. Experimental results showed that the sensitivity of QDs-4 towards Hg2+ was much higher than that of QDs-3 nanoprobe. The mechanism of reaction has been elucidated based on the ability of Hg2+ to coordinate with the sulphur atom of the Ni complex ring and apparently “turn ON” the fluorescence of the linked QDs.
- Full Text:
- Authors: Adegoke, Oluwasesan , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/189818 , vital:44934 , xlink:href="https://doi.org/10.1007/s10895-013-1317-4"
- Description: We report on the design and application of fluorescent nanoprobes based on the covalent linking of L-glutathione-capped CdSe@ZnS quantum dots (QDs) to newly synthesized unsymmetrically substituted nickel mercaptosuccinic acid triazatetra-benzcorrole (3) and phthalocyanine (4) complexes. Fluorescence quenching of the QDs occurred on conjugation to complexes 3 or 4. The nanoprobes were selectively screened in the presence of different cations and Hg2+ showed excellent affinity in “turning ON” the fluorescence of the nanoprobes. Experimental results showed that the sensitivity of QDs-4 towards Hg2+ was much higher than that of QDs-3 nanoprobe. The mechanism of reaction has been elucidated based on the ability of Hg2+ to coordinate with the sulphur atom of the Ni complex ring and apparently “turn ON” the fluorescence of the linked QDs.
- Full Text:
Using multivariate analysis and stable isotopes to assess the effects of substrate type on phytobenthos communities
- Dalu, Tatenda, Richoux, Nicole B, Froneman, P William
- Authors: Dalu, Tatenda , Richoux, Nicole B , Froneman, P William
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68123 , vital:29201 , https://doi.org/10.5268/IW-4.4.719
- Description: Publisher version , For more than a century, artificial substrates have been employed in phytobenthos studies. In the present study, we compared the phytobenthos community structure in a field experiment over 3 seasons (summer, autumn, and winter) on 3 types of artificial substrates (brick, brown clay tiles, and grey clay tiles) and 3 natural substrates (macrophytes, rocks, and sediment) in a small, temperate system. A combination of multivariate analyses (cluster, multi-response permutation procedure, indicator species [IndVal], and canonical correspondence analysis [CCA]) and stable isotope analysis was used. We identified 96 total phytobenthos taxa. Artificial substrates resulted in different substrate communities, as shown by stable isotope analysis, cluster analysis, and a multi-response permutation procedure, with only those communities growing on grey tiles being similar to natural substrate communities. Overall, artificial substrates exhibited slightly higher species richness compared to natural substrates over the 3 seasons, although there were no significant differences (p> 0.05). Phytobenthos grown on brown tiles, rocks, and bricks showed seasonal variability of the carbon isotope δ13C values using one-way ANOVA (p< 0.05). Phytobenthos community structure did not show great seasonal variation; however, CCA identified water flow, conductivity, ammonium, phosphate, and water depth as important in structuring phytobenthos communities on different substrates. IndVal analysis showed that common phytobenthos taxa were not restricted to a single substrate, but preference was generally high for natural substrate, especially rocks, compared to artificial substrates. Substrate microhabitat type seems to influence the communities within the study areas.
- Full Text: false
- Authors: Dalu, Tatenda , Richoux, Nicole B , Froneman, P William
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/68123 , vital:29201 , https://doi.org/10.5268/IW-4.4.719
- Description: Publisher version , For more than a century, artificial substrates have been employed in phytobenthos studies. In the present study, we compared the phytobenthos community structure in a field experiment over 3 seasons (summer, autumn, and winter) on 3 types of artificial substrates (brick, brown clay tiles, and grey clay tiles) and 3 natural substrates (macrophytes, rocks, and sediment) in a small, temperate system. A combination of multivariate analyses (cluster, multi-response permutation procedure, indicator species [IndVal], and canonical correspondence analysis [CCA]) and stable isotope analysis was used. We identified 96 total phytobenthos taxa. Artificial substrates resulted in different substrate communities, as shown by stable isotope analysis, cluster analysis, and a multi-response permutation procedure, with only those communities growing on grey tiles being similar to natural substrate communities. Overall, artificial substrates exhibited slightly higher species richness compared to natural substrates over the 3 seasons, although there were no significant differences (p> 0.05). Phytobenthos grown on brown tiles, rocks, and bricks showed seasonal variability of the carbon isotope δ13C values using one-way ANOVA (p< 0.05). Phytobenthos community structure did not show great seasonal variation; however, CCA identified water flow, conductivity, ammonium, phosphate, and water depth as important in structuring phytobenthos communities on different substrates. IndVal analysis showed that common phytobenthos taxa were not restricted to a single substrate, but preference was generally high for natural substrate, especially rocks, compared to artificial substrates. Substrate microhabitat type seems to influence the communities within the study areas.
- Full Text: false
Utilizing gesture recognition and Ethernet AVB for distributed surround sound control
- Hedges, Mitchell, Foss, Richard
- Authors: Hedges, Mitchell , Foss, Richard
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426816 , vital:72393 , https://www.aes.org/e-lib/online/browse.cfm?elib=17540
- Description: Gesture recognition has become a preferred approach to the control of various systems. This allows users of the system to interact without having to use any controls or equipment. This paper investigates the use of gesture recognition in order to select and transport audio tracks over an Ethernet AVB network to speaker endpoints. The research uses equipment that is commercially available and relatively cost efficient. The endpoints receive audio samples that are encapsulated within network packets and processes them. The audio tracks are mixed at the endpoints according to gain ratios that will change and be different for each endpoint.
- Full Text:
- Authors: Hedges, Mitchell , Foss, Richard
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426816 , vital:72393 , https://www.aes.org/e-lib/online/browse.cfm?elib=17540
- Description: Gesture recognition has become a preferred approach to the control of various systems. This allows users of the system to interact without having to use any controls or equipment. This paper investigates the use of gesture recognition in order to select and transport audio tracks over an Ethernet AVB network to speaker endpoints. The research uses equipment that is commercially available and relatively cost efficient. The endpoints receive audio samples that are encapsulated within network packets and processes them. The audio tracks are mixed at the endpoints according to gain ratios that will change and be different for each endpoint.
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Variations in moult, morphology, movement and survival rates of the Sombre Greenbul Andropadus importunus within southern Africa
- Authors: Bonnevie, Bo T
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/448368 , vital:74725 , https://doi.org/10.2989/00306525.2014.902403
- Description: Ringing data from the South African bird ringing unit, SAFRING, were analysed to explore variations and trends in population parameters of the Sombre Greenbul Andropadus importunus in southern Africa. Adult and juvenile body mass increased southwards, whereas the relative sizes of wings and bills decreased southwards. Recapture and recovery data indicated that adults have very high site fidelity and suggested that juvenile dispersal is limited. The annual survival rate of adults was on average more than twice that of juveniles and there was little regional variation within either age group. The onset of primary wing moult became progressively later northwards, but the duration of moult did not vary significantly with latitude. Juveniles started their first normally descendent wing moult sequence about one month after adults.
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- Authors: Bonnevie, Bo T
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/448368 , vital:74725 , https://doi.org/10.2989/00306525.2014.902403
- Description: Ringing data from the South African bird ringing unit, SAFRING, were analysed to explore variations and trends in population parameters of the Sombre Greenbul Andropadus importunus in southern Africa. Adult and juvenile body mass increased southwards, whereas the relative sizes of wings and bills decreased southwards. Recapture and recovery data indicated that adults have very high site fidelity and suggested that juvenile dispersal is limited. The annual survival rate of adults was on average more than twice that of juveniles and there was little regional variation within either age group. The onset of primary wing moult became progressively later northwards, but the duration of moult did not vary significantly with latitude. Juveniles started their first normally descendent wing moult sequence about one month after adults.
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Voltammetric investigation of complex growth media at a bare glassy carbon electrode: a case study of oxytetracycline
- Kruid, Jan, Fogel Ronen, Limson, Janice
- Authors: Kruid, Jan , Fogel Ronen , Limson, Janice
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431206 , vital:72753 , xlink:href="https://doi.org/10.1016/j.electacta.2013.08.188"
- Description: Reports regarding the voltammetric properties of microbiological growth media are scarce in the literature and limited focus has been placed towards the application of electroanalysis for analyte monitoring in these complex media. This work aims to investigate the viability of voltammetry as a quantification method for analytes in microbiological growth media, using oxytetracycline (OTC) as a model analyte. Analysis of both commercially available and laboratory prepared growth media indicated the presence of interfering media components which produced anodic peaks at potentials ranging from ∼+0.85 V to ∼+1.30 V (vs. Ag/AgCl) under acidic conditions and ∼+0.62 V to ∼+1.35 V (vs. Ag/AgCl) under neutral pH. These peaks were identified as originating from proteinaceous components of growth media and correlated to the presence of peptone, malt extract and yeast extract. Electrochemical impedance spectroscopy demonstrated significant increases in the charge transfer resistance for Fe(CN)63−/4− redox probes at glassy carbon electrodes in the presence of peptone-comprised media (130.3 Ω) compared to media-free buffer (50.4 Ω). Adsorption of the aforementioned media components to the electrode surface thus contributes to analytical interference through faradaic and non-faradaic processes. By adapting the growth media for analyte detection purposes, this study proves the feasibility of detecting OTC, as well as the use of dilution of the media to further decrease the interferent effects of growth media. A 50-fold dilution of the media provided a 96.7% recovery of the OTC peak current at 20 μM concentration. The empirical detection limit of OTC in 50-fold diluted media was determined to be 0.5 μM, which makes it applicable to current industrial OTC fermentation processes.
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- Authors: Kruid, Jan , Fogel Ronen , Limson, Janice
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431206 , vital:72753 , xlink:href="https://doi.org/10.1016/j.electacta.2013.08.188"
- Description: Reports regarding the voltammetric properties of microbiological growth media are scarce in the literature and limited focus has been placed towards the application of electroanalysis for analyte monitoring in these complex media. This work aims to investigate the viability of voltammetry as a quantification method for analytes in microbiological growth media, using oxytetracycline (OTC) as a model analyte. Analysis of both commercially available and laboratory prepared growth media indicated the presence of interfering media components which produced anodic peaks at potentials ranging from ∼+0.85 V to ∼+1.30 V (vs. Ag/AgCl) under acidic conditions and ∼+0.62 V to ∼+1.35 V (vs. Ag/AgCl) under neutral pH. These peaks were identified as originating from proteinaceous components of growth media and correlated to the presence of peptone, malt extract and yeast extract. Electrochemical impedance spectroscopy demonstrated significant increases in the charge transfer resistance for Fe(CN)63−/4− redox probes at glassy carbon electrodes in the presence of peptone-comprised media (130.3 Ω) compared to media-free buffer (50.4 Ω). Adsorption of the aforementioned media components to the electrode surface thus contributes to analytical interference through faradaic and non-faradaic processes. By adapting the growth media for analyte detection purposes, this study proves the feasibility of detecting OTC, as well as the use of dilution of the media to further decrease the interferent effects of growth media. A 50-fold dilution of the media provided a 96.7% recovery of the OTC peak current at 20 μM concentration. The empirical detection limit of OTC in 50-fold diluted media was determined to be 0.5 μM, which makes it applicable to current industrial OTC fermentation processes.
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Why care about sharing?: Shared phones and shared netowrks in rural areas: African trends
- Authors: Dalvit, Lorenzo
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158639 , vital:40217 , https://hdl.handle.net/10520/EJC159490
- Description: Tomi Ahonen, credited with introducing the concept of mobile as the seventh mass media, notes that the arrival of the mobile phone was a God-send for advertisers, as it is the only mass medium where the audience can be accurately identified. Conversely, the pervasiveness of location-aware, multi-sensor, permanently on and constantly connected devices raised privacy concerns about carrying "little brother" in your pocket at all times. One of the distinctive characteristics of mobile phones, setting them apart from all previous media, is the fact that they are personal devices: 60% of married users would not let their spouse access their mobile phone and, not surprisingly, teenagers are even less inclined to let their family members have a look at their device. Things have not always been so. In South Africa, research conducted among university students revealed that for many a hand-me-down phone the size of a brick and shared with siblings was their first mobile device.
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- Authors: Dalvit, Lorenzo
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/158639 , vital:40217 , https://hdl.handle.net/10520/EJC159490
- Description: Tomi Ahonen, credited with introducing the concept of mobile as the seventh mass media, notes that the arrival of the mobile phone was a God-send for advertisers, as it is the only mass medium where the audience can be accurately identified. Conversely, the pervasiveness of location-aware, multi-sensor, permanently on and constantly connected devices raised privacy concerns about carrying "little brother" in your pocket at all times. One of the distinctive characteristics of mobile phones, setting them apart from all previous media, is the fact that they are personal devices: 60% of married users would not let their spouse access their mobile phone and, not surprisingly, teenagers are even less inclined to let their family members have a look at their device. Things have not always been so. In South Africa, research conducted among university students revealed that for many a hand-me-down phone the size of a brick and shared with siblings was their first mobile device.
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Xenophobia, sovereign power and the limits of citizenship:
- Idahosa, Grace E, Vincent, Louise
- Authors: Idahosa, Grace E , Vincent, Louise
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141970 , vital:38020 , DOI: 10.1080/09744053.2014.914637
- Description: African foreigners in South Africa have frequently been the targets of violent and discriminatory practices, which occur in the enabling context of negative discourses concerning African foreigners that circulate in various spheres of public life. This study is interested in one particular field of interaction between African foreigners and the South African state, namely the public health sector. Discriminatory and, sometimes, violent practices towards African foreigners on the part of South African citizens are widely documented. Less discussed are the ways in which these practices of violence and discrimination are in fact state practices. We show this with reference to the treatment of African foreigners in the public health sector. We refer to this prejudicial treatment as health-care Xenophobia which is made possible by a wider set of discourses related to citizenship and the rights accruing to citizens which suggest the ‘non-rights’ of the non-citizen.
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- Authors: Idahosa, Grace E , Vincent, Louise
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141970 , vital:38020 , DOI: 10.1080/09744053.2014.914637
- Description: African foreigners in South Africa have frequently been the targets of violent and discriminatory practices, which occur in the enabling context of negative discourses concerning African foreigners that circulate in various spheres of public life. This study is interested in one particular field of interaction between African foreigners and the South African state, namely the public health sector. Discriminatory and, sometimes, violent practices towards African foreigners on the part of South African citizens are widely documented. Less discussed are the ways in which these practices of violence and discrimination are in fact state practices. We show this with reference to the treatment of African foreigners in the public health sector. We refer to this prejudicial treatment as health-care Xenophobia which is made possible by a wider set of discourses related to citizenship and the rights accruing to citizens which suggest the ‘non-rights’ of the non-citizen.
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Zimbabwe takes back its land:
- Authors: Helliker, Kirk D
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144677 , vital:38369 , DOI: 10.1080/02589001.2014.984946
- Description: Zimbabwe Takes Back its Land offers a useful introduction to fast-track land reform in contemporary Zimbabwe for a broad popular audience unfamiliar with the existing literature on fast-track land reform. But its value as a contribution to a more specialised and nuanced body of knowledge about fast-track is considerably more problematic.
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- Authors: Helliker, Kirk D
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/144677 , vital:38369 , DOI: 10.1080/02589001.2014.984946
- Description: Zimbabwe Takes Back its Land offers a useful introduction to fast-track land reform in contemporary Zimbabwe for a broad popular audience unfamiliar with the existing literature on fast-track land reform. But its value as a contribution to a more specialised and nuanced body of knowledge about fast-track is considerably more problematic.
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