422 research outputs found

    Nils Andersen : sy lewe en sy werk

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    Nils Andersen is op 26 September 1897 in Drammen, \u27n klein landelike dorpie naby Oslo (Swede), gebore as die selin van \u27n skeepskaptein. Nils het sy skoolloopbaan in hierdie dorpie begin en dadelik getoon dat hy oor buitengewone tekentalent beskik. Sy vader was juis betrokke by die Wa.lvisbedryf toe die familie in Mei 1911 besluit het om na Suid-Afrika te emigreer en so het bulle vroeg in Junie van dieselfde jaar die hawelose Saldanhabaai ingevaar. Die skerp en warm lig bet die dertienjarige Nils verstom -alles was So skerp belyn en afgeteken teen die helder lug. Die donker skaduwees en die spierwit "over exposed white sands and super-white cottages" was \u27n ver-rassende nuwe ondervinding

    The response of aluminium and glass fibre FMLS subjected to blast loading

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    Fibre-Metal Laminates (FMLs) have long been of interest to the aeronautics industry due to their exceptional strength to weight ratio, fatigue and impact resistance. Due to the increasing global risk of subversive activity in this industry, the focus of research in recent years has shifted to the blast resistance of these materials. A particularly interesting material being GLARE, a commercially available Aluminium-GFRP FML. This dissertation presents the results of an experimental study into the effects of glass fibre configuration and epoxy type on the response of glass fibre reinforced, epoxy-based FMLs, subjected to localised and uniform blast loading conditions. Standard tensile specimens and Single-Leg Bend (SLB) specimens were manufactured and tested to determine the properties constitutive materials and interfacial bond strength. Bond strength between the composite and metal interfaces was improved by employing a combination of surface treatments, consisting of both mechanical and chemical as well as the use of a film adhesive. FMLs were manufactured from Al 2024-T3 and e-glass fibre reinforced epoxy composite. Both woven and unidirectional fibre configurations were used as part of either a prepreg or wet layup to construct the composite layers. Tensile and SLB specimens were used to characterise the constitutive materials and interfacial bond strength. SLB tests were used to determine the effect of cure cycle and composite layup technique on interfacial bond strength. These tests and revealed a variety of interfacial failure modes for different cure cycles and epoxy configurations, each resulting in different levels of strength. The modes, in increasing order of strength, included debonding of the film adhesive from either the metal or composite interface or both, and in some cases also included delamination in the composite layer. Tests showed that a single stage layup and cure cycle resulted in the strongest bonds between interfaces, compared to a multi-stage manufacturing processes. It was also shown that the use of prepreg resulted in stronger inter-facial bonds than a wet-layup process. The properties of the constitutive materials were used to construct a numerical model to aid in experimental design. The model was used to determine a suitable range of charge masses for testing

    Corporate Social Responsibility Intervention Of One Mining Operator: A Community Development Case In Bojanala District, South Africa

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    The South African economy constantly experiences work stoppages, is gradually losing its pride and currently experiences decisive anomalous moments underpinning new operational perceptions. Mining organisations seem to be blamed for not doing enough social capital development initiatives, particularly in underdeveloped communities. This study examines in depth the role of a mining company’s involvement in an identifiable community in South Africa’s Bojanala District. Specifically, the study evaluates the steps followed in identifying needs and the usefulness of a mining-project designed to enhance capacity-building opportunities for young South Africans; a sustainable development initiative. Qualitative action research was used in this study to ensure a participatory approach of the data gathering processes to personal and professional transformation. Action research phases were followed in the manner of Maree (2014). The findings suggest that expectations for community development projects are greater in rural and peri-uburban South African communities. It was found that participants had a general inability to read, write, speak, listen and apply the mathematical proficiency that is needed in order to function effectively in an employment environment. The youth unemployment rate in the Bojanala District can be attributed to the gap between their level of education and the employment requirements. The miners are deemed to have a responsibility towards their communities and it is the youth of these same communities that look towards the mines for employment. Mining companies can contribute to education, skills development and training of the youth. If community engagement is taken seriously as a CSR strategic approach, this would enhance positive inter-relations between the mining companies and their communities

    Fusions of the feminine and technology : exploring the cyborg as subversive tool for feminist reconstructions of identity

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    Thesis (MA (English))--University of Stellenbosch, 2009.In this dissertation the dominant metaphor for the fusion between the feminine and technology, the cyborg, will be examined through various texts to assess the value the cyborg has for feminism as a tool to exposes the constructedness of boundaries of identity and gender, thereby enabling a reconstruction of a new feminine identity in a subversive and transgressive space. The main themes which will be addressed are those that often feature in feminist science fiction: reproduction, sexuality, the construction of identity and gender through science, culture and ideology, and the power relations between men and women. Other related concepts which will be dealt with are language, self and Other, representation and perspective. Feminist science fiction and theory attempt to destabilise conventional boundaries concerned with gender and identity and the texts which this dissertation deals with are all, to varying degrees, concerned with this destabilisation, each offering a unique perspective on feminine identity and the attempted transformation of current gender categories which will be explored in detailed analysis

    The Membrane Gradostat Reactor: Secondary metabolite production, bioremediation and commercial potential

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    This manuscript focuses on the aspect of a membrane gradostat as an entirely different concept compared to submerged hollow fibre modules. The use of membrane bioreactor (MBR) technology is rapidly advancing in the wastewater treatment industries. However, this is not the case in the biopharmaceutical manufacturing industries. The MGR has shown great potential and versatility in terms of industrial applications. It can be used in both wastewater treatment and biopharmaceutical manufacturing using different modes of operation to meet any predetermined process  requirements. The MGR concept uses capillary membranes, which contain microvoids in the substructure to immobilise microbial cells or enzymes, depending on the bioreactor’s application. Operational requirements of the MGR and its commercial potential are discussed from a bioprocess engineering perspective

    Sistematies verwronge kommunikasie in Lukas 14:1-6: Die dialekties-kritiese teorie van Jürgen Habermas krities bespreek

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    Systematically distorted communication in Luke 14:1-6: A critical assessment of the dialectical-critical theory of Jürgen Habermas In this article the epistemology and essence of the practical interest of Jürgen Habermas’s dialectical-critical theory is discussed, focusing on his concept of systematically distorted communication. The article aims at describing the theory of communicative competence or universal pragmatics by means of an exegetical study of Luke 14:1-6. The appropriationof Habermas’s theory on Luke 14:1-6 is assessed from the perspective of some results of the recent social-scientific studies of the New Testament

    Microfinance and loan officers' work experiences: perspectives from Zambia

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    This article studies the challenges faced by microfinance institutions in Zambia, whose remit it is to provide financial services to the poor. It focuses on loan officers – the agents of delivery on the ground. With reference to loan officers’ experiences and words, the paper examines how gender and education shape and structure their day-to-day encounters. The study finds that different social spaces – ’the office’ and ‘the field’ – and wider context explains the gendered, culturally complex and multidimensional nature of developmental work at grassroots level. Social expectations emerge as major pressure points more for female loan officers than their male counterparts, making them less suitable for microfinance work, which has traditionally targeted poor women

    Haunting temporalities: Creolisation and black women's subjectivities in the diasporic science fiction of Nalo Hopkinson

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    Philosophiae Doctor - PhDThis study examines temporal entanglement in three novels by Jamaican-born author Nalo Hopkinson. The novels are: Brown Girl in the Ring (1998), Midnight Robber (2000), and The Salt Roads (2004). The study pays particular attention to Hopkinson's use of narrative temporalities, which are shape by creolisation. I argue that Hopkinson creatively theorises black women's subjectivities in relation to (post) colonial politics of domination. Specifically, creolised temporalities are presented as a response to predatory Western modernity. Her innovative diasporic science fiction displays common preoccupations associated with Caribbean women writers, such as belonging and exile, and the continued violence enacted by the legacy of colonialism and slavery. A central emphasis of the study is an analysis of how Hopkinson not only employs a past gaze, as the majority of both Caribbean and postcolonial writing does to recover the subaltern subject, but also how she uses the future to reclaim and reconstruct a sense of selfhood and agency, specifically with regards to black women. Linked to the future is her engagement with notions of technological and social betterment and progress as exemplified by her emphasis on the use of technology as a tool of empire. By writing science fiction, Hopkinson is able to delve into the nebulous nexus of technology, empire, slavery, capitalism and modernity. And, by employing a temporality shaped by creolisation, she is able to collapse discrete historical time-frames, tracing obscured connections between the nodes of this nexus from its beginnings on the plantation, the birthplace of creolisation and, as some have argued, of modernity itself

    Malic Acid in Wine: Origin, Function and Metabolism during Vinification

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    The production of quality wines requires a judicious balance between the sugar, acid and flavour components of wine.  L-Malic and tartaric acids are the most prominent organic acids in wine and play a crucial role in the winemaking process, including the organoleptic quality and the physical, biochemical and microbial stability of wine.  Deacidification of grape must and wine is often required for the production of well-balanced wines. Malolactic fermentation induced by the addition of malolactic starter cultures, regarded as the preferred method for naturally reducing wine acidity, efficiently decreases the acidic taste of wine, improves the microbial stability and modifies to some extent the organoleptic character of wine. However, the recurrent phenomenon of delayed or sluggish malolactic fermentation often causes interruption of cellar operations, while the malolactic fermentation is not always compatible with certain styles of wine. Commercial wine yeast strains of Saccharomyces are generally unableto degrade L-malic acid effectively in grape must during alcoholic fermentation, with relatively minor modifications in total acidity during vinification. Functional expression of the malolactic pathway genes, i.e. the malate transporter (mae1) of Schizosaccharomyces pombe and the malolactic enzyme (mleA) from Oenococcus oeni in wine yeasts, haspaved the way for the construction of malate-degrading strains of Saccharomyces for commercial winemaking

    Ekonomie in die tyd van die Bybel as ’n huishouding-gebaseerde ekonomie

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    Economy in the time of the Bible as a household based economy The aim of this article is to describe the economy in the time of the Bible as a household economy. Firstly, the results of social scientific research indicated that the family institution was the primary socio-economic and political building block of the first century Mediterranean world. Secondly, the social scientific model of the pre-industrial city is used as interpretation framework for the first century Mediterranean economy. The article concludes with a reflection on the exploitation of peasants by urban elite and aristocrats. They were absent landowners who controlled the land and production on the land
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