https://commons.ru.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 A model for privacy-aware presence management in mobile communications https://commons.ru.ac.za/vital/access/manager/Repository/vital:9757 Wed 12 May 2021 23:30:42 SAST ]]> Identity, belonging and ecological crisis in South African speculative fiction https://commons.ru.ac.za/vital/access/manager/Repository/vital:2219 Wed 12 May 2021 23:24:45 SAST ]]> Exploring opportunities for action competence development through learners' participation in waste management activities in selected primary schools in Botswana https://commons.ru.ac.za/vital/access/manager/Repository/vital:1541 Wed 12 May 2021 23:04:09 SAST ]]> Poverty attribution and reaction to income inequality in Nigeria: the case of Badia community in Lagos https://commons.ru.ac.za/vital/access/manager/Repository/vital:11951 Wed 12 May 2021 23:02:45 SAST ]]> Information security service management : a service management approach to information security management https://commons.ru.ac.za/vital/access/manager/Repository/vital:9755 Wed 12 May 2021 22:50:30 SAST ]]> Systematics, morphology, phylogeny and historical biogeography of the Mayfly family Prosopistomatidae (Ephemeroptera: Insecta) of the world https://commons.ru.ac.za/vital/access/manager/Repository/vital:5785 Wed 12 May 2021 22:17:34 SAST ]]> Land use change, landslide occurrence and livelihood strategies on Mount Elgon Slopes, Eastern Uganda https://commons.ru.ac.za/vital/access/manager/Repository/vital:10646 10 percent), are fine textured (>50 percent of the material passing the 0.075mm sieve) and highly plastic. These soil attributes imply low permeability, excessive water retention and high susceptibility to expansion and sliding. The vertic nature of soils at Nametsi was confirmed by the extremely high plasticity indices (averaging 33percent), while, high liquid limits at Buwabwala (53 percent) and Kitati (59 percent) qualified the soils as vertisols which are associated with landslides. The results point to the fact that soils at landslide sites are inherently ‘problem soils’ where slope failure can occur even without human intervention. Therefore, the hypothesis that soils at three landslide sites are inherently ‘problem soils’ where slope failure can occur even without human intervention is accepted. Notwithstanding the fact that the study was focussed on mid-altitude slopes of Mt Elgon, the results are in tandem with investigations carried out earlier on the lower densely populated slopes, thus confirming the widespread nature of problem soils on Mt Elgon. There is an urgent need to control human population growth and restore forest cover on the heavily deforested steep slopes particularly within the National Park, and restrain communities from encroaching on the pristine slopes of Mt Elgon. This will be achieved if the politicians, Park Authorities and local communities jointly participate in the design and implementation of CFMs. Future research could focus on climate change implications of deforestation of Mt Elgon environments and quantification of carbon loss related to deforestation and soil degradation in the mountain environments.]]> Wed 12 May 2021 21:01:04 SAST ]]> Development and testing of liposome encapsulated cyclic dipeptides https://commons.ru.ac.za/vital/access/manager/Repository/vital:10136 Wed 12 May 2021 20:37:34 SAST ]]> A framework to evaluate usable security in online social networking https://commons.ru.ac.za/vital/access/manager/Repository/vital:9807 Wed 12 May 2021 20:31:17 SAST ]]> Nursing strategies to facilitate self-management in persons living with diabetes mellitus type 2 https://commons.ru.ac.za/vital/access/manager/Repository/vital:10019 Wed 12 May 2021 20:16:20 SAST ]]> Sedimentology of plio-pleistocene gravel barrier deposits in the palaeo-Orange River mouth, Namibia : depositional history and diamond mineralisation https://commons.ru.ac.za/vital/access/manager/Repository/vital:4927 75 million carats recovered at >95% gem quality) comprises onshore and offshore marine deposits that are developed within ∼100km of the Orange River outfall. For much of the Cainozoic, this long-lived fluvial system has been the main conduit transporting diamonds from kimberlitic and secondary sources in the cratonic hinterland of southern Africa to the Atlantic shelf that has been neutrally buoyant over this period. Highly energetic marine processes, driven in part, by southerly winds with an attendant northward-directed longshore drift, have generated terminal placers that are preserved both onshore and offshore. This study, through detailed field sedimentological and diamond analyses, investigates the development and mineralisation of gravel barrier deposits within the ancestral Orange River mouth area during a major ∼30 m regional transgression ('30 m Package') in the Late Pliocene. At that time, diamond supply from this fluvial conduit was minimal, yet the corresponding onshore marine deposits to the north of the Orange River mouth were significantly diamond enriched, enabling large-scale alluvial diamond mining to take place for over 75 years. Of the entire coastline of south-western Africa, the most complete accumulation of the '30 m Package' is preserved within the palaeo-Orange River mouth as barrier spit and barrier beach deposits. Arranged vertically and laterally in a 16m thick succession, these are deposits of: (1) intertidal beach, (2) lagoon and washover, (3) tidal inlet and spit recurve and (4) storm-dominated subtidal settings. These were parts of larger barrier features, the bulk of which are preserved as highstand deposits that are diamond-bearing with varying, but generally low grades (<13 stones (diamonds) per hundred tons, spht). Intertidal beach and spit recurve deposits have higher economic grades (12-13 spht) due to the energetic sieving and mobile trapping mechanisms associated with their emplacement. In contrast, the less reworked and more sandy subtidal, tidal inlet and washover deposits have un-economic grades (<2 spht). Despite these low grades, the barrier deposits have the largest average stone (diamond) size (1-2 carats/stone, cts/stn) of the entire Namibian mega-placer, given their proximity to the ancestral Orange River outfall. This study demonstrates that barrier shoreline evolution at the fluvial/marine interface was controlled by: (1) a strong and coarse fluvial sediment supply that sustained shoreline growth on a highly energetic coast, (2) accommodation space facilitating sediment preservation and (3) short-duration, high-frequency sea-level cycles superimposed on the∼30 m regional transgression, promoting hierarchal stacking of progradational deposits. During these sea-level fluctuations, diamonds were 'farmed' from older, shelf sequences in the offshore and driven landward to accumulate in '30 m Package' highstand barrier deposits. In spite of the large supply of diamonds, their retention in these deposits was poor due to an incompetent footwall of ancestral Orange River mouth sediment and the inherent cobble-boulder size of the barrier gravels. Thus the principal process controlling diamond entrapment in these barrier deposits was kinetic sieving in a coarse-grained framework. Consequently, at the marine/fluvial interface and down-drift for ∼5 km, larger diamonds (1-2 cts/stn) were retained in low-grade (<2 spht), coarse-gravel barrier shorelines. Smaller diamonds (mostly < I cts/stn) were rejected into the northward-driven littoral sediments and further size-sorted along ∼95 km of Namibian coast to accumulate in finer, high-grade beach placers (> 100 spht) where bedrock footwall promoted such high concentrations. The gravel-dominated palaeo-Orange River mouth is considered to be the ' heart' of the Namibian mega-placer, controlling sediment and diamond supply to the littoral zone further north. Although coarse gravel is retained at the river mouth, the incompetence of this highly energetic setting to trap diamonds renders it sub-economic. This ineffectiveness at the fluvial/marine interface is thus fundamental in enriching the coastal tract farther down-drift and developing highly economic coastal placers along the Atlantic coast of south-western Africa.]]> Wed 12 May 2021 20:08:03 SAST ]]> Economics of land reform models used in Mashonaland Central Province of Zimbabwe https://commons.ru.ac.za/vital/access/manager/Repository/vital:11168 Wed 12 May 2021 20:03:58 SAST ]]> African traditional medicine-antiretroviral interactions : effects of Sutherlandia frutescens on the pharmacokinetics of Atazanavir https://commons.ru.ac.za/vital/access/manager/Repository/vital:3859 Wed 12 May 2021 19:39:20 SAST ]]> Comparative study of the feeding damage caused by the South African biotypes of the Russian wheat aphid (Diuraphis noxia Kurdjumov) on resistant and non-resistant lines of barley (Hordeum vulgare L.) https://commons.ru.ac.za/vital/access/manager/Repository/vital:4201 Wed 12 May 2021 19:25:43 SAST ]]> Desegregation and socio-spatial integration in residential suburbs in East London, South Africa (1993-2008) https://commons.ru.ac.za/vital/access/manager/Repository/vital:11504 Wed 12 May 2021 19:18:22 SAST ]]> Dynamics of macrophytes in the East Kleinemonde, a small temporarily open/closed South Afrcan Estuary https://commons.ru.ac.za/vital/access/manager/Repository/vital:10605 30 ppt) and high water level (> 1.6 m amsl) in the estuary. Water level increased by up to 0.33 m due to large volumetric changes and salinity was significantly higher in the 16 month closed euhaline phase after the breach (31 ± 0.9 ppt) compared to 21.9 ± 0.9 ppt in the closed polyhaline phase before the September 2008 breach. This increase in salinity significantly reduced the cover of the submerged macrophytes Ruppia cirrhosa and Chara vulgaris. They were replaced by macroalgae during this high salinity phase. The cover of supratidal salt marsh and reed habitats was also significantly reduced during the high water level phase, which in turn would lead to the potential for bank destabilisation and erosion. Based on the average elevation above sea level position of the macrophytes in the East Kleinemonde iv Estuary, a threshold water level was identified as 1.55 amsl. This was taken to be the height above sea level at which there was a maximum cover change for each macrophyte habitat. Above this water level emergent macrophyte habitat would mainly be inundated. This, together with 30 ppt salinity, was identified as the two thresholds for macrophyte change in the East Kleinemonde Estuary. From these thresholds and the 5 year dataset four biotic states were identified as State A: open and tidal, State B: closed with a water level below 1.55 m amsl and salinity between 18 to 30 ppt, State C: closed and water level above 1.55 m amsl and salinity between 18 to 30 ppt and State D: closed and water level above 1.55 m amsl and salinity above 30 ppt. Intertidal salt marsh, reeds and sedges were dominant during the open phase. Submerged macrophytes were dominant during the closed polyhaline state and macroalgae during the closed euhaline state. The high variability of abiotic factors common in TOCEs and the response of macrophyte habitat indicated that macrophytes were resilient to changing states provided they were of relatively short (< 3 months) duration. Macrophytes in the East Kleinemonde Estuary were found to have fast growth rates and large seed reserves in the sediment. The seed banks in the East Kleinemonde, as well as the adjacent temporarily open/closed West Kleinemonde Estuary were quantified for the first time in a South African estuary. The averaged data from both estuaries showed that Charophyte öospores represented almost 72 percent of the sexual propagules in the sediment with a mean öospore density of 31 306 ± 2 293 m-2. This was despite the Charophytes being sparsely located and only representing a maximum of 32.5 percent cover in the above ground vegetation. Historically there must have been stands of Charophytes in the East Kleinemonde Estuary, such that öospores could accumulate to such high density found in this study. The second highest seed density was for the intertidal salt marsh plant Sarcocornia tegetaria (18 percent) (7 929 ± 688 seed m-2), followed by the submerged angiosperm Ruppia cirrhosa (7 percent) (2 852 ± 327 seeds m-2). Although seed density did not differ significantly with sediment depth, seeds still occurred at 20 cm below the surface of the sediment providing a regeneration source in the event of sediment scouring during a flood event. Germination studies in the greenhouse showed that most seeds were viable and Sarcocornia tegetaria began to germinate after 3 days to a maximum of 82 percent after 91 days. Submerged species only germinated after 18 days with a low maximum germination of between 11 and 15 percent. This study has made an original contribution to the field of knowledge on macrophyte responses in a small TOCE as it showed that macrophyte habitats in the East Kleinemonde Estuary have a high natural variability in cover over time, they respond quickly after a disturbance event such as a mouth breach and there are large sediment seed reserves that remain viable from 2 to more than 5 years. This ensures habitat persistence even under unfavourable conditions, such as prolonged periods of mouth closure with high water level and flooding which causes loss of salt marsh species. Given this natural variability it is necessary to predict responses both spatially and temporally in order to manage and maintain ecological functioning in TOCEs. This study identified dominant macrophyte habitat for different abiotic states through the use of water level and salinity thresholds. In the determination of the freshwater requirements of any South African estuary freshwater inflow rates are provided for each estuary's past, present and possible future freshwater inflow scenarios. These flow data are generated by hydrological models and simulated monthly inflow volumes for a period of about 72 years are provided. For the East Kleinemonde freshwater requirement study for any year in that 70-odd year period, the number of high flow and low flow mouth breaches were predicted, as well as the closed state periods. The threshold water level of 1.55 m amsl was also used to filter past, present and future inflow monthly volumes to determine the frequency of the four abiotic states identified in this study. It was based on a water level/water volume equation calculation from a digital elevation model. Results showed that the total closed period in the present state was 83 percent, made up of 48 percent of the time in a polyhaline state (State C) and 35 percent in a euahaline state (State D). A second method was used to quantify available spatial habitat under different water level scenarios. A spatial model was written in Model Builder, an application in ArcGIS that allowed a series of processes to be built. A habitat map was overlaid with a bathymetric map and by selecting water level, available habitat areas were determined and empirical equations of water level versus available habitat were produced. These equations were then used to calculate the available habitat areas for monthly water level conditions from the freshwater requirement study for the past, present and two future inflow scenarios. Using both the threshold water level method and the spatial availability model method it was possible to assess the effect of the two future inflow scenarios on macrophyte habitat vi response. Scenario 1 had a 16 percent reduction in mean annual runoff (MAR) generating low flows for 88.6 percent of the time and a 3.5 percent reduction in flood events. In Scenario 2 there would be a 12 percent reduction in MAR with low flows occurring for 87.5 percent of the year, a 5.3 percent reduction in floods and an 11.5 percent reduction in the open mouth state. The model showed that Scenario 1 would have the highest submerged macrophyte area (12.56 ha versus 12.48 ha in Scenario 2), whereas Scenario 2 produced the largest mudflat and intertidal salt marsh area (7.11 ha versus 7.34 ha) due to lower water level in conjunction with the bathymetry of the estuary. A reduction in freshwater inflow to TOCEs either due to anthropogenic influences or natural precipitation cycles is one of the main threats to the optimum functioning of these estuaries. The results from this study and the two methods of assessing the effect of freshwater inflow scenarios on macrophytes in TOCEs can be integrated into the current freshwater inflow assessment methodology in South Africa, as well as adding to our understanding of the ecological functioning of these small, highly variable estuaries. The methods provide a quick assessment of macrophyte habitat associated with abiotic states under past, present and future inflow scenarios. All that is required to predict macrophyte habitat for different freshwater inflow scenarios (present, past and future) is a habitat map, a bathymetric map and the elevation range of macrophytes in the TOCE being assessed. This, together with the knowledge of response rates, provides invaluable information for the management of TOCEs to maintain their ecological functioning under altered freshwater inflow regimes.]]> Wed 12 May 2021 19:17:54 SAST ]]> Characterization and electrocatalytic applications of metallophthalocyanine-single walled carbon nanotube conjugates https://commons.ru.ac.za/vital/access/manager/Repository/vital:4419 Wed 12 May 2021 19:14:46 SAST ]]> Evidence-informed clinical guidelines for nursing care practices related to the safety of the mechanically ventilated patient https://commons.ru.ac.za/vital/access/manager/Repository/vital:10027 Wed 12 May 2021 19:11:33 SAST ]]> Performance evaluation of buildings in educational institutions: a case of Universities in South-East Nigeria https://commons.ru.ac.za/vital/access/manager/Repository/vital:9683 Wed 12 May 2021 19:02:47 SAST ]]> Tailoring a lean product development framework for the South African automotive industry https://commons.ru.ac.za/vital/access/manager/Repository/vital:8792 Wed 12 May 2021 19:01:50 SAST ]]> Enhancing the role of the Kaizen suggestion tool in South African lean automotive companies of the Eastern Cape https://commons.ru.ac.za/vital/access/manager/Repository/vital:8644 Wed 12 May 2021 18:38:39 SAST ]]> (In)visibility and the exercise of power: a genealogy of the politics of drag spectacles in a small city in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:3013 Wed 12 May 2021 18:37:06 SAST ]]> Assessing the impact of school governance in the Limpopo Department of Education with specific reference to Mankweng and Polokwane circuits https://commons.ru.ac.za/vital/access/manager/Repository/vital:11663 Wed 12 May 2021 18:33:34 SAST ]]> Modelling the relationship between flow and water quality in South African rivers https://commons.ru.ac.za/vital/access/manager/Repository/vital:6039 Wed 12 May 2021 18:26:52 SAST ]]> Nanomaterial modified electrodes : optimization of voltammetric sensors for pharmaceutical and industrial application https://commons.ru.ac.za/vital/access/manager/Repository/vital:4101 Wed 12 May 2021 18:21:27 SAST ]]> An investigation into the role of Xhosa male initiation in moral regeneration https://commons.ru.ac.za/vital/access/manager/Repository/vital:16132 Wed 12 May 2021 18:16:10 SAST ]]> Relations of family and school attachment to forms of learner violence in secondary school communities in Amathole education district, Eastern Cape https://commons.ru.ac.za/vital/access/manager/Repository/vital:16166 Wed 12 May 2021 18:15:23 SAST ]]> Investigation and laboratory tests of sub-economic aluminium resources in China https://commons.ru.ac.za/vital/access/manager/Repository/vital:11520 Wed 12 May 2021 18:12:32 SAST ]]> Studies in marine quinone chemistry https://commons.ru.ac.za/vital/access/manager/Repository/vital:4355 Wed 12 May 2021 18:09:57 SAST ]]> Money attitudes and materialism among generation Y South Africans: a life-course study https://commons.ru.ac.za/vital/access/manager/Repository/vital:9286 Wed 12 May 2021 17:55:12 SAST ]]> Structural and functional characterisation of the protein inhibitor of activated STAT3 (PIAS3) https://commons.ru.ac.za/vital/access/manager/Repository/vital:3991 Wed 12 May 2021 17:52:26 SAST ]]> Oil enclave economy and sexual liaisons in Nigeria's Niger Delta region https://commons.ru.ac.za/vital/access/manager/Repository/vital:3318 Wed 12 May 2021 17:41:09 SAST ]]> An evaluation of impact of co-operative societies on poverty alleviation among the urban poor in Harare, Zimbabwe during the period 2008-2010 https://commons.ru.ac.za/vital/access/manager/Repository/vital:11422 Wed 12 May 2021 17:40:06 SAST ]]> Adaptation choices, community perceptions, livelihood linkages and income dynamics for district producer communities surrounding Nyatana Game Park in Zimbabwe https://commons.ru.ac.za/vital/access/manager/Repository/vital:11154 Wed 12 May 2021 17:37:12 SAST ]]> An assessment of the implementation of continuing professional development programmes for primary school teachers in Malawi: a case of Zomba rural education district https://commons.ru.ac.za/vital/access/manager/Repository/vital:16178 Wed 12 May 2021 17:25:49 SAST ]]> "On se Débrouille": Congolese migrants' search for survival and success in Muizenberg, Cape Town https://commons.ru.ac.za/vital/access/manager/Repository/vital:2094 Wed 12 May 2021 17:14:13 SAST ]]> Pressurized hot water extraction of nutraceuticals and organic pollutants from medicinal plants https://commons.ru.ac.za/vital/access/manager/Repository/vital:4338 Wed 12 May 2021 16:51:46 SAST ]]> Informal cross border trading and poverty reduction in the Southern Africa development community: the case of Zimbabwe https://commons.ru.ac.za/vital/access/manager/Repository/vital:11421 Wed 12 May 2021 16:46:50 SAST ]]> Investigation of antidiabetic properties, mechanisms of action and toxicology of Strychnos Henningsii (GILG) bark https://commons.ru.ac.za/vital/access/manager/Repository/vital:11254 Wed 12 May 2021 16:44:12 SAST ]]> Conflict and sustainable development: the case of the great Limpompo Transfrontier Park (GLTP), Southern Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:8158 Wed 12 May 2021 16:27:21 SAST ]]> A status assessment of mangrove forests in South Africa and the utilization of mangroves at Mngazana Estuary https://commons.ru.ac.za/vital/access/manager/Repository/vital:10604 300 cm) Rhizophora trees at Mngazana Estuary. Mortality of Avicennia marina individuals (51-150 cm) was related to tree density indicating intraspecific competition and self thinning. Selective harvesting of particular size classes of Rhizophora mucronata was recorded when comparing length of harvested poles (~301 cm) and the size class distribution of individuals. Taking into account the differences in growth rate for each size class for this species it will take approximately 13 years to attain a height of 390 cm which is the height at which trees are selected for harvesting at this estuary. This is 2.6 times slower than those individuals growing in Kenya. The feasibility of harvesting is dependent on the growth rate of younger size classes to replace harvested trees as well as the rate of natural recruitment feeding into the population. Different harvesting intensity scenarios tested within a matrix model framework showed that limits should be set at 5 percent trees ha-1 year-1 to maintain seedling density at > 5 000 ha-1 for R. mucronata. However harvesting of Bruguiera gymnorrhiza should be stopped due to the low density of this species at Mngazana Estuary. Harvesting of the tallest trees of Avicennia marina can be maintained at levels less than 10 percent ha-1 year-1. Effective management of mangrove forests in South African is important to maintain the current state, function and diversity of these ecosystems. Management recommendations should begin with determining the freshwater requirements of the estuaries to maintain the mouth dynamics and biotic communities and deter the harvesting of (whole) adult trees particularly those species that do not coppice. Further management is needed to ensure that forests are cleared of pollutants (plastic and industrial), and any further developments near the mangroves should be minimized.]]> Wed 12 May 2021 16:26:19 SAST ]]> An analysis of sources and predictability of geomagnetic storms https://commons.ru.ac.za/vital/access/manager/Repository/vital:5451 Wed 12 May 2021 16:24:52 SAST ]]> An international comparative study on the relationship marketing and customer retention of retail banks : lessons for South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:9358 Wed 12 May 2021 16:08:04 SAST ]]> Biological control of Pereskia aculeata Miller (Cactaceae) https://commons.ru.ac.za/vital/access/manager/Repository/vital:5825 Wed 12 May 2021 16:03:06 SAST ]]> An investigation of the attitudes of South African Police Service management with respect to the viability of computer-assisted training in the Eastern Cape Province https://commons.ru.ac.za/vital/access/manager/Repository/vital:8190 Wed 12 May 2021 15:57:39 SAST ]]> Investigating the impact of a psychometric assessment technique in the South African automotive industry https://commons.ru.ac.za/vital/access/manager/Repository/vital:9397 Wed 12 May 2021 15:53:10 SAST ]]> Risk-based assessment of environmental asbestos contamination in the Northern Cape and North West provinces of South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:4780 Wed 12 May 2021 15:48:13 SAST ]]> The discoursal construction of female physical identity in selected works in children's literature https://commons.ru.ac.za/vital/access/manager/Repository/vital:2377 Wed 12 May 2021 15:47:03 SAST ]]> Mutational analysis of the PacC binding sites within the aflR promoter in Aspergillus flavus https://commons.ru.ac.za/vital/access/manager/Repository/vital:10336 Wed 12 May 2021 15:44:08 SAST ]]> Effect of nanoparticles on the photophysicochemical behaviour of metallophthalocyanines https://commons.ru.ac.za/vital/access/manager/Repository/vital:4310 Tue 24 Aug 2021 16:28:07 SAST ]]> "But what story?": a narrative-discursive analysis of "white" Afrikaners' accounts of male involvement in parenthood decision-making https://commons.ru.ac.za/vital/access/manager/Repository/vital:3025 40 years), which were then differentiated according to gender, reproductive status, and relationship status. Treating the interviews as jointly produced narratives, I analysed them by means of a performativity/performance lens. This dual analytic lens focuses on how particular narrative performances are simultaneously shaped by the interview setting and the broader discursive context. The lens was fashioned by synthesising Butler’s theory of performativity with Taylor’s narrative-discursive method. This synthesis (1) allows for Butler’s notion of “performativity” to be supplemented with that of “performance”; (2) provides a concrete analytical strategy in the form of positioning analysis; and (3) draws attention to both the micro politics of the interview conversation and the operation of power on the macro level, including the possibility of making “gender trouble”. The findings of the study suggest that the participants experienced difficulty narrating about male involvement in parenthood decision-making, owing to the taken for granted nature of parenthood for heterosexual adults. This was evident in participants’ sidelining of issues of “deciding” and “planning” and their alternate construal of childbearing as a non-choice, which, significantly served to bolster hetero-patriarchal norms. A central rhetorical tool for accomplishing these purposes was found in the construction of the “sacralised” child. In discursively manoeuvring around the central problematic, the participants ultimately produced a “silence” in the data that repeats the one in the research literature.]]> Tue 15 Aug 2023 16:06:17 SAST ]]> The druggable antimalarial target 1-deoxy-D-xylulose-5-phosphate reductoisomerase: purfication, kinetic characterization and inhibition studies https://commons.ru.ac.za/vital/access/manager/Repository/vital:3949 Thu 13 May 2021 13:31:40 SAST ]]> Preparation and evaluation of Lignocellulose-Montmorillonite nanocomposites for the adsorption of some heavy metals and organic dyes from aqueous solution https://commons.ru.ac.za/vital/access/manager/Repository/vital:11333 Thu 13 May 2021 08:22:47 SAST ]]> Strategies to create a post-merged organisational culture conducive to effective performance management https://commons.ru.ac.za/vital/access/manager/Repository/vital:9385 Thu 13 May 2021 08:11:25 SAST ]]> Regional application of the Pitman monthly rainfall-runoff model in Southern Africa incorporating uncertainty https://commons.ru.ac.za/vital/access/manager/Repository/vital:6037 Thu 13 May 2021 07:39:03 SAST ]]> Molecular characterization, antibiograms and antibacterial activities of selected medicinal plants against some enteric pathogens https://commons.ru.ac.za/vital/access/manager/Repository/vital:18475 Thu 13 May 2021 07:30:43 SAST ]]> Die outobiografiese kode in Antjie Krog se poëtiese oeuvre https://commons.ru.ac.za/vital/access/manager/Repository/vital:8444 Thu 13 May 2021 07:07:06 SAST ]]> Dryland conservation areas, indigenous people, livelihoods and natural resource values in South Africa: the case of Kgalagadi Transfrontier Park https://commons.ru.ac.za/vital/access/manager/Repository/vital:4777 Thu 13 May 2021 06:53:03 SAST ]]> Fundamental investigations into the factors affecting the response of laccase-based electrochemical biosensors https://commons.ru.ac.za/vital/access/manager/Repository/vital:4073 Thu 13 May 2021 06:37:23 SAST ]]> Tailoring a lean product development framework for the South African automotive industry https://commons.ru.ac.za/vital/access/manager/Repository/vital:9605 Thu 13 May 2021 06:23:24 SAST ]]> Core self-evaluations, racial evaluation and learning amongst Zulu students at the university of Zululand https://commons.ru.ac.za/vital/access/manager/Repository/vital:9879 Thu 13 May 2021 05:54:16 SAST ]]> Management and performance indicators of micro-finance institutions in Uganda https://commons.ru.ac.za/vital/access/manager/Repository/vital:9273 Thu 13 May 2021 05:34:55 SAST ]]> Improving organisational effectiveness of public enterprises in Kenya https://commons.ru.ac.za/vital/access/manager/Repository/vital:8660 Thu 13 May 2021 05:31:29 SAST ]]> The development of novel cancer targeting agents https://commons.ru.ac.za/vital/access/manager/Repository/vital:10397 Thu 13 May 2021 05:26:59 SAST ]]> Investigation of photosensitising behaviour of Ni, Pd and Pt phthalocyanines towards phenolic pollutants https://commons.ru.ac.za/vital/access/manager/Repository/vital:4321 Thu 13 May 2021 05:22:21 SAST ]]> Factors contributing to the success of professional and business women in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:9275 Thu 13 May 2021 05:19:27 SAST ]]> An investigation into Grade R teachers' experiences of implementing numeracy in Grade R https://commons.ru.ac.za/vital/access/manager/Repository/vital:1855 Thu 13 May 2021 05:15:17 SAST ]]> Effect of alkaline pre-treatments on the synergistic enzymatic hydrolysis of sugarcane (Saccharum officinarum) bagasse by Clostridium cellulovorans XynA, ManA and ArfA https://commons.ru.ac.za/vital/access/manager/Repository/vital:3952 Thu 13 May 2021 04:58:57 SAST ]]> Repulsive-attractive models for the impact of two predators on prey species varying in anti-predator response https://commons.ru.ac.za/vital/access/manager/Repository/vital:10506 (Kw + $) −W . This result shows that the warthog’s equilibrium population density is bounded above by population thresholds, i.e., W < (Kw+$). Besides showing the occurrence under parameter space of the so-called paradox of enrichment, early indicators of chaos can also be deduced. In addition, numerical results revealed stable oscillatory behaviour and stable spirals of the species as predator fertility rate, mortality rate and prey threshold were varied. The stabilising effect of prey refuge due to variations in predator fertility and proportion of prey in the refuge was studied. Formulation and analysis of a robust mathematical model for two predators having an overlapping dietary niche were also done. The Beddington-DeAngelis functional and numerical responses which are relevant in addressing the Principle of Competitive Exclusion as species interact were incorporated in the model. The stabilizing effect of additional food in relation to the relative diffusivity D, and wave number k, was investigated. Stability, dissipativity, permanence, persistence and periodicity of the model were studied using the routine and limit cycle perturbation methods. The periodic solutions (b 1 and b 3), which influence the dispersal rate (') of the interacting species, have been shown to be controlled by the wave number. For stability, and in order to overcome predator natural mortality, the nutritional value of predator additional food has been shown to be of high quality that can enhance predator fertility gain. The threshold relationships between various ecosystem parameters and the carrying capacity of the game park for the prey species were also deduced to ensure ecosystem persistence. Besides revealing irregular periodic travelling wave behaviour due to predator interference, numerical results also show oscillatory temporal dynamics resulting from additional food supplements combined with high predation rates.]]> Thu 13 May 2021 04:45:04 SAST ]]> Molecular analysis of genetic diversity in dometicated pigeonpea (Cajanus cajan (L.) Millsp.) and wild relatives https://commons.ru.ac.za/vital/access/manager/Repository/vital:4204 Thu 13 May 2021 04:43:58 SAST ]]> An intervention for enhancing the mathematics teaching practices of grade four teachers in the Nelson Mandela Metropolitan area https://commons.ru.ac.za/vital/access/manager/Repository/vital:9499 Thu 13 May 2021 04:23:27 SAST ]]> Effects of polarization in a distributed raman fibre amplifier https://commons.ru.ac.za/vital/access/manager/Repository/vital:10544 Thu 13 May 2021 04:18:24 SAST ]]> Exploring ways of assisting Lesotho educators to offer care and support to children orphaned and rendered vulnerable by HIV and AIDS https://commons.ru.ac.za/vital/access/manager/Repository/vital:9503 Thu 13 May 2021 04:16:23 SAST ]]> Differential expression and regulation of sucrose transporters in rice (Orzya sativa L, cv Nipponbare) during environmental stress conditions https://commons.ru.ac.za/vital/access/manager/Repository/vital:11249 Thu 13 May 2021 04:09:33 SAST ]]> Surface properties and electrocatalytic applications of metallophthalocyanines confined on electrode surfaces https://commons.ru.ac.za/vital/access/manager/Repository/vital:4365 Thu 13 May 2021 03:50:26 SAST ]]> A framework to enhance the mobile user experience in an Mlearning interaction https://commons.ru.ac.za/vital/access/manager/Repository/vital:9753 Thu 13 May 2021 03:43:53 SAST ]]> Synthesis and evaluation of novel HIV-1 enzyme inhibitors https://commons.ru.ac.za/vital/access/manager/Repository/vital:4369 Thu 13 May 2021 03:41:05 SAST ]]> Phytochemical analysis and bioactivity of selected South African medicinal plants on clinical isolates of Helicobacter pylori https://commons.ru.ac.za/vital/access/manager/Repository/vital:11260 Thu 13 May 2021 03:38:41 SAST ]]> Adequacy of the advanced certificate in education to develop the work-intergrated learning competencies of principals: a case study https://commons.ru.ac.za/vital/access/manager/Repository/vital:9472 Thu 13 May 2021 03:32:11 SAST ]]> Crime, violence and apartheid in selected works of Richard Wright and Athol Fugard: a study https://commons.ru.ac.za/vital/access/manager/Repository/vital:11888 Thu 13 May 2021 03:31:09 SAST ]]> My other - my self: post-Cartesian ontological possibilities in the fiction of J M Coetzee https://commons.ru.ac.za/vital/access/manager/Repository/vital:2246 Thu 13 May 2021 03:08:52 SAST ]]> A series of systematic case studies on the treatment of rape-related PTSD in the South African context implications for practice and policy https://commons.ru.ac.za/vital/access/manager/Repository/vital:3035 Thu 13 May 2021 02:44:55 SAST ]]> Performance improvement in South African construction https://commons.ru.ac.za/vital/access/manager/Repository/vital:9678 Thu 13 May 2021 02:41:58 SAST ]]> Post-impoundment population dynamics of non-native common carp Cyprinus Carpio in relation to two large native cyprinids in Lake Gariep, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:5311 Thu 13 May 2021 02:41:00 SAST ]]> Health information technologies for improved continuity of care: a South African perspective https://commons.ru.ac.za/vital/access/manager/Repository/vital:9730 Thu 13 May 2021 02:39:14 SAST ]]> Social policy and the state in South Africa: pathways for human capability development https://commons.ru.ac.za/vital/access/manager/Repository/vital:11439 Thu 13 May 2021 02:32:09 SAST ]]> Secondary school children's experiences of bereavement: implications for school counselling in Harare Metropolitan Province https://commons.ru.ac.za/vital/access/manager/Repository/vital:16196 Thu 13 May 2021 02:30:59 SAST ]]> A participatory communication approach of rural cattle project: a case study of Nguni cattle project in the Eastern Cape, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:11370 Thu 13 May 2021 02:25:55 SAST ]]> An investigation into the replication biology of Helicoverpa armigera stunt virus https://commons.ru.ac.za/vital/access/manager/Repository/vital:3967 Thu 13 May 2021 02:10:17 SAST ]]> Intellectualisation of African languages with particular reference to isiXhosa https://commons.ru.ac.za/vital/access/manager/Repository/vital:27035 Thu 13 May 2021 02:03:09 SAST ]]> Synthesis of novel inhibitors of 1-Deoxy-D-xylulose-5-phosphate reductoisomerase as potential anti-malarial lead compounds https://commons.ru.ac.za/vital/access/manager/Repository/vital:4372 Thu 13 May 2021 01:49:31 SAST ]]> Climate change adaptation and economic valuation of local pig genetic resources in communal production systems of South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:11805 Thu 13 May 2021 01:37:07 SAST ]]> Management and the dynamics of labour process: study of workplace relations in an oil refinery, Nigeria https://commons.ru.ac.za/vital/access/manager/Repository/vital:3299 Thu 13 May 2021 01:26:32 SAST ]]> Macrophytes as indicators of physico-chemical factors in South African Estuaries https://commons.ru.ac.za/vital/access/manager/Repository/vital:10597 Thu 13 May 2021 00:35:38 SAST ]]> The business sustainability of an automotive refinish paint distributor https://commons.ru.ac.za/vital/access/manager/Repository/vital:9371 Thu 13 May 2021 00:30:59 SAST ]]> Land use/cover change modelling and land degradation assessment in the Keiskamma catchment using remote sensing and GIS https://commons.ru.ac.za/vital/access/manager/Repository/vital:10647 Thu 13 May 2021 00:17:10 SAST ]]> Intelligent automotive thermal comfort control https://commons.ru.ac.za/vital/access/manager/Repository/vital:9645 Thu 13 May 2021 00:14:49 SAST ]]> An evaluation of the effectiveness of Walter Sisulu University's teaching practice as a context for student teachers' competence development https://commons.ru.ac.za/vital/access/manager/Repository/vital:18455 Thu 13 May 2021 00:07:03 SAST ]]> Development of MgZnO-grown MOCVD for UV Photonic applications https://commons.ru.ac.za/vital/access/manager/Repository/vital:10537 580 ˚C) growth temperatures reduce the Mg incorporation. High VI/II ratios also decrease the Mg incorporation, as evidenced by the red-shift of the donor bound exciton (D°X) line. This is ascribed to a stronger premature reaction between (MeCp)2Mg and the oxidant or a preferential heterogeneous interaction between the Mg and oxygen species on the growth front. For both oxidizing agents (O2 and TBOH), the growth at 420 ˚C and a VI-II ratio of 60 on c-Al2O3 gave optimal quality layers in terms of their optical and structural quality. A comparison of films grown using TBOH and O2 gas as oxidizing agent shows no major difference in terms of Mg incorporation. The effect of annealing, the inclusion of a buffer layer and the influence of growth rate on the properties MgxZn1-xO thin films are also reported.]]> Thu 13 May 2021 00:01:15 SAST ]]> A framework for the application of network telescope sensors in a global IP network https://commons.ru.ac.za/vital/access/manager/Repository/vital:4593 Thu 07 Jul 2022 20:21:17 SAST ]]>