Browsing by Author "Dlodlo, T.S."

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    On the efficacy of a proposed unsteady state heat loading protocol
    (NetJournals, 2020) Bepete, S.; Dlodlo, T.S.; Mudono, S.; Marwizi, T.
    The paper relates to the thermodynamics of heat transfer processes in which the source of heat is a hot gaseous fluid. The effect of systematically introducing alternating conditions of compression and decompression inside a heat exchanger is investigated. The said alternating conditions are actuated by introducing two periodic valves at the heat exchanger inlet and outlet. This unsteady state mode of operation is shown to result in enhanced heat exchange under certain conditions. This method of heat exchange has been termed ‘Unsteady State Heat Loading Protocol (USHLP).’ Experiments were carried out to compare steady state and USHLP based heat transfer in the context of steam providing heat to a water evaporation process. In the experiments, heat was transferred from steam to an evaporation process through a jacket type heat exchanger. An increase in efficiency of around 42% was observed from replacing steady state heat transfer with USHLP under the same operating conditions and geometric configuration. The results of the experiments are discussed in the concluding sections of the paper. It was noted that consistently less steam was used per unit amount of water evaporated in experiments where USHLP was used as compared to steady state heat transfer
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    Translating scientific terms across European and African languages—Physics in Nguni II.
    (International Journal of Indigenous Education Scholarship, 2021) Dlodlo, T.S.
    The use of European languages as languages of instruction in education continues in many Sub-Saharan African countries, in spite of several decades of political independence. This is also the situation in science teaching. Several studies have shown that children learn best when taught in their own mother languages. Teaching in these languages necessitates translation of science terms and concepts into Indigenous languages. Using quantum mechanics, a field in modern physics and my mother tongue, isiNguni, as an example, I have developed translation strategies and suggested practical approaches to create science vocabulary in isiNguni. It is shown that it is feasible to apply direct borrowing with localisation and semantic extension in developing new physics vocabulary. Several examples of translated science terms and concepts in isiNguni are provided. Selected paragraphs on electron spin from a frequently used undergraduate physics textbook are translated into isiNguni. In the Appendices, the Compton effect experiment is presented in three languages accompanied by a vocabulary. African countries need to revise their language and education policies so that maximum use of the Indigenous languages and the future relevance of these languages in science and technology are ensured. Teaching physics and other science subjects in the mother tongues of both teachers and students will improve science literacy, comprehension, and interest in the field. Africa should embrace science and technology to contribute to new knowledge.