Hydrographic conditions of a continental shelf region in the Northwest African Upwelling System from in-situ data

This study investigates the hydrographic and dynamic properties of the continental shelf region between Cape Juby (28.5 °N) and Agadir (30.4 °N) within the Moroccan Sub-region of the North West African Upwelling System. Data came from two cruises conducted in June (beginning of summer) and November (end of autumn) 2013. Coastal upwelling was obvious in both cruises in the in-situ temperature and salinity data as well as in remotely sensed sea surface temperature maps. ADCP data showed the presence of a strong jet like current associated with enhanced upwelling off Cape Juby. This strong quasi-permanent upwelling center was observed during both cruises. It results from the orientation of this portion of coast which is aligned with the dominant wind direction, as well as a wind intensification near the cape. The presence of a secondary upwelling front was also observed near the shelf break. It was accompanied by an intense baroclinic jet. The EK60 data showed evidence of internal waves as well as small and mesoscale turbulence that were probably strongly interacting with the mean upwelling circulation and made a straightforward interpretation of the data quite challenging. However, this study revealed the main physical processes of this poorly studied region, as well as their seasonal variability

Corporate Social investment and development

Can the Corporate Social Investment initiatives of small businesses contribute to development? Corporate Social Investment (CSI) and its counterpart Corporate Social Responsibility (CSR) are the terms used for the external and internal initiatives undertaken by companies to contribute to the upliftment of their stakeholders and communities. This research paper attempts to establish whether the CSI initiatives of small, local (Cape Town) companies have the potential to contribute to this upliftment or development. The literature review conducted on the relevant topic discovered three major arguments surrounding this debate. Firstly there are those authors that believe that CSI / CSR cannot contribute to development; secondly those authors that believe that CSI / CSR can contribute to development; and finally those authors that believe that more research on this topic is required before any such statements can be made. The outcome of the literature will reveal some issues surrounding this argument. They are: motivations, compatibility, implementation, business advantage, business and NGOs and community focus and research and sustainability. Following the establishment of the technical issues the paper will then propose that Amartya Sen's Development as Freedom theory be used to further investigate the development potential of CSI initiatives. Along with the technical suggestions, Sen's five 2 freedoms will be used to analyse whether any potential development successes can be observed from seven case studies. The freedoms are: political freedoms, economic facilities, social opportunities, transparency guarantees and protective security. Each of these can contribute to development. The case studies are CSI initiatives selected from local small businesses and the required information was extracted by means of an openended qualitative questionnaire. These case studies will be analysed against the freedoms and the discoveries from the literature review. The conclusions drawn show that some potential does exist for CSI initiatives. It also shows that Sen's Development as Freedom can be effectively applied to small scale projects at the micro level

Day Labour Mobile Electronic Data Capture and Browsing System

In this paper, a day-labour Mobile Electronic Data Capture and Browsing (MEDCB) system is presented. In building and evaluating this system, the primary aim was to evaluate the possibility of applying mobile data capture and browsing to the day-labour market with a view to improving data capture and verification accuracy and efficiency. The MEDCB system consists of a mobile client application and a web interface. The system was evaluated with non-profit organizations working for day labour semiliterate job seekers. Results showed that data capture, processing and browsing is a possibility in day labour market. Improvement in accuracy and efficiency was also seen with the use of MEDCB. We describe the design process, present initial findings and discuss the results

Boundary work in the process of informal job seeking : an ethnographic study of Cape Town roadside workseekers

Includes abstract.Includes bibliographical references (p. 79-83).In the context of rising unemployment, an NGO called Men on the Side of the Road (MSR) was established to provide men who stand by the side of the road waiting to be offered jobs with job opportunities and skills. The purpose of the ethnographic study described here was to assess members‘ experiences and attitudes towards the work or income-earning opportunities introduced to members by MSR. The overall goal of the report was to assess why a large proportion of the work opportunities introduced to members were not taken up with great enthusiasm. After completion of the study, the researcher found that the day-labourers used three different labels ('locals', 'networking workers' and 'struggling foreigners') to describe themselves and other roadside workseekers

Contrasting motivation and learning strategies of ex-mathematics and ex-mathematical literacy students

Abstract: This inquiry contrasts motivation and learning strategies of ex-Mathematics (Maths) and ex-Mathematical Literacy (ML) students. ML ideally delivers candidates who can make sense of and actively participate in a world of numbers and numerical arguments, but ex-ML students are excluded from many undergraduate studies at most South African higher education institutions (HEIs). Institutions employ various strategies in enhancing student transition to higher education (HE), however, such options are rare for ex-ML students. A year-long foundation programme offered by a private HEI is one exception. This inquiry employed the Motivated Strategies for Learning Questionnaire and t-test, detecting significant differences in motivation and learning strategies between 111 ex-Maths and 81 ex-ML students. The intrinsic goal orientation, task value, self-efficacy, effort regulation and test anxiety-handling abilities of ex-Maths students were significantly superior. An integrated solution process addressing academic content and social-psychological attributes to improve the motivation of ex-ML students in support of their academic development is proffered

The effect of exercise on spatial learning and hippocampal proteins in maternally separated adult rats

Includes bibliographical references.Repeated maternal separation (MS) has been reported to induce changes in hypothalamic-pituitary- adrenal (HPA) axis activity leading to abnormal stress responses later in life. Such alterations have also been linked to poor cognitive function. In contrast, exercise enhances cognitive function. Previously, we reported that MS improved object location memory. However, exercise had no effect on object location memory despite increases in levels of synaptophysin and phospho-extracellular signal-regulated protein kinase (pERK) in the hippocampus of non-separated-exercised rats. In the current study, the same MS technique and three-week voluntary exercise regimen were tested to determine their effect on spatial learning in young adult Sprague-Dawley (SD) rats. A total of 144 rats were either maternally separated from postnatal day 2 to 14 or designated as controls. At postnatal day 50, rats were transferred to cages with attached running wheels. Approximately half of the rats were allowed to exercise voluntarily in the wheels whilst the wheels attached to the cages of the remaining non-exercising rats were immobilised. Rats were divided into 3 cohorts. Cohort 1 provided baseline levels of pERK, mitogen-activated protein kinase phosphatase-1 (MKP-1) and brain derived neurotrophic factor (BDNF) after exercise. Cohorts 2 and 3 were trained in the Morris Water Maze (MWM) 1 and 15 days post-exercise, respectively. Consistent with our previous findings, pERK was increased in non-separated-exercised rats post-exercise. MKP-1, the regulator of pERK, was also increased in the non-separated-exercised group. BDNF was decreased in the MS non-exercised group but augmented by exercise. All groups trained immediately after exercise performed similarly in the MWM but MS rats from cohort 3 had better reversal spatial memory. According to these results, repeated MS decreased neurotrophic factors but did not alter the plasticity-related proteins measured in this study. However, this phenomenon was not associated with performance in the spatial learning and memory task in the MWM. These current observations support our previous findings that MS can cause adaptations that lead to improved learning and memory in adulthood

Software design for informal setups: Centring the benefits

Appropriating technology for the benefit of the very poor is a key theme of Information and Communication Technology for Development (ICT4D). Our aim is to design systems that reduce the challenges faced by the poor in the informal sector of the labour market. However, designing for non-structured problem areas involving socio-economic webs is challenging and requires more than just the ‘normal’ user requirements gathering techniques. In such social problem areas solutions must prioritize the direct benefits for the target groups. In this paper, a novel design technique for designing in an informal sector problem areas, the case of day labour market, is presented. It involves iteratively reviewing field work results of a long term study, reinforcing those findings with existing literature and eventually critically validating the requirements using existing Management Information Systems (MISs). In this method, benefits to target users are placed at the centre throughout the design process. Our design outcome and its relation to the design process is also presented

Current status and impact (2004-2015) of indigenous ungulate herbivory on the vegetation of Sanbona Wildlife Reserve in the Little Karoo

Game farming is becoming more popular in southern Africa and the introduction of large indigenous ungulates into confined enclosed areas could alter plant communities and ecosystem processes. This is of particular concern in semi-arid rangelands of the Succulent Karoo where the evolutionary history of grazing is not clear and the compatibility of large herbivores in confined areas remains to be demonstrated. The establishment of Sanbona Wildlife Reserve, a 54 000 hectare private game reserve in the Little Karoo, which converted from livestock farming to game farming, allows an opportunity to study the vegetation dynamics in a confined plant-herbivore system. This study investigates the current community structure and the changes in the floral composition and vegetation structure of enclosed and comparable sites subjected to grazing by large herbivores after twelve years (2004-2015). It also determines the relative effect of grazing and rainfall on the observed patterns. Finally, the implications of these findings for management are discussed. Data from drop-point surveys in fenced (exclosure) and unfenced (grazed) plots in the dominant vegetation types as well as annual and seasonal rainfall totals, stocking rates of herbivores and annual game census information, were analysed. These were used in multivariate ordination techniques, regressions and linear mixed-effects models to determine the communities and their relationship with herbivory and rainfall over time and identify a set of indicator species. The annual game census information was used to determine areas of herbivore preference or 'hotspots' and for the identification of highly-utilised areas. Cluster analysis, using the flexible beta method in PC-Ord, was used to determine the current plant communities. Non-metric multidimensional scaling ordination (NMS) was used to determine the relationship of these communities with the environmental variables and illustrate the trajectories in floristic data. Species were also assigned to plant growth forms and examined as communities and growth form types. The Bray-Curtis distance measures were used to investigate the difference between each treatment over time, within each vegetation community and between treatments. Finally, the effects of rainfall and herbivory were examined using linear mixed-effects models of change over time vs the various potential determinants of change using lmer functions in R. Four communities were identified. These communities corresponded well with to the vegetation type descriptions for Western Little Karoo, Little Karoo Quartz Vygieveld and Renosterveld as described in the National Vegetation Map of Mucina and Rutherford (2006). However, the Western Little Karoo was too broad and two communities were recognised within this vegetation type. The finer scale mapping by Vlok et al. (2005) corresponded relatively well to these communities. Results showed an increase in species richness, abundance and cover over time, with the ungrazed plots experiencing more change than the plots exposed to grazing. Most growth forms exhibited an increase in cover, although low leaf succulents declined in both grazed and ungrazed plots. Medium evergreen shrubs declined in the exclosures and stem succulents declined in the grazed plots. The effects were found in both grazed and ungrazed treatments. In addition, many species which declined in abundance were unpalatable or toxic to herbivores. Because of this, the decline in cover of such species was not attributed to grazing, but was instead interpreted as being a response to other disturbance mechanisms, to competitive displacement and to rainfall events. The low stocking rates in the first five years of the study resulted in there being very little difference evident between the treatments. However, once stocking rates increased from 2008, both species richness and cover increased more rapidly in the ungrazed plots, compared to the grazed plots. An increase in palatable and unpalatable species was observed within both ungrazed and grazed plots indicating that grazing did not change the proportion of palatability classes. However, specific plots in the areas of high animal utilisation were more affected as indicated by the response of cover, species richness and palatable species in these specific plots. This suggests that the grazing pressure may be too high within those areas. The linear mixed-effect model supports the argument that grazing pressure is the dominant driver of the community change within grazed plots. Similarly, the results show that rainfall is the primary driver of the vegetation community in the absence of grazing. Timing, amount and intensity of rainfall can mask these impacts. Thus, the contribution of grazing to vegetation change can probably only be detected by tracking the trends over decades or longer. The use of indicators as a management tool is well documented. In order to identify indicators, a theoretical framework for determining indicators species in the different vegetation communities was created. This was based on the correlation between species abundance and sampling period in the different treatments, which identified species that have significantly increased or decreased over time as a result of the change in land use. Species identified as potential indicators were selected on the basis based on their abundance and ranged in lifespans and palatability. The indicators chosen need to be monitored into the future to confirm their utility as indicators. A small but significant difference between grazed and ungrazed plots suggest that herbivore impact is apparent. Identifying this trend indicates that the monitoring programme is providing a useful tool for assessing the impact of herbivores on an ongoing basis. The recovery process following the withdrawal of domestic livestock from Sanbona was much slower in the grazed plots than in the protected plots. Therefore, for the continued recovery of the vegetation to occur and for there to be a sustained increase in cover, active management of animal numbers needs to take place. The results from this study can contribute to future management decisions on the reserve and form a basis for future analyses

Flexible risk-based portfolio optimisation

The purpose of this study is to present and test a general framework for risk-based investing. It permits various risk-based portfolios such as the global minimum variance, equal risk contribution and equal weight portfolios. The framework also allows for different estimation techniques to be used in finding the portfolios. The design of the study is to collate the existing research on risk-based investing, to analyse some modern methods to reduce estimation risk, to incorporate them in a single coherent framework, and to test the result with South African equity data. The techniques to reduce estimation risk draw from the usual mean-variance and risk-based optimisation literature. The techniques include regime switching, quantile regression, regularisation and subset resampling. In the South African experiment, risk-based portfolios materially outperformed the market weight portfolio out-of-sample using a Sharpe ratio measure. Additionally, the global minimum variance portfolio performed better than other risk-based portfolios. Given the long estimation window, no estimation techniques consistently outperformed the application of sample estimators only

Travel service exports as comparative advantage in South Africa

World service exports have grown at a rapid rate over the past few decades. While some countries have benefited from the surge in service exports, others have been left behind. This paper provides a snapshot of South Africa’s comparative performance in service exports, using a new measure of revealed comparative advantage, the normalised revealed comparative advantage (NRCA). Countries are ranked according to their performance in 10 service export sectors. South Africa is found to reveal a strong comparative advantage in travel service exports (tourism). A discussion of the travel services sector follows, with historical, theoretical and empirical evidence to support the NRCA findings