Browsing by Author "De Wet, P."

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    Chenin blanc wine volatiles and the intensity of a guava-like flavour
    (South African Society for Enology and Viticulture, 1982) Van Rooyen, P. C.; De Wet, P.; Van Wyk, C. J.; Tromp, A.
    A guava-like flavour occurring in some South African Chenin blanc and Colombard dry white wines was investigated. Headspace volatiles of some of these wines, as well as those of fresh guava fruits, were analysed by means of a gas chromatograph equipped with a "sniffer-detector". In contrast to the headspace concentrate of guava fruits, no single fraction with a typical guava flavour was found in the wines analysed. The pattern recognition system "ARTHUR" was therefore used to investigate relationships between the more important wine volatiles and the intensity of a guava-like flavour of a set of wines originating from the same Chenin blanc must. Sensory scores for this flavour were used in both category and continuous property analysis in each case. Category and correlation to property plots were used to elucidate the results. Several promising variables and ratios between variables were singled out for further investigation, notably ethyl butyrate and the ratios ethyl butyrate/ethyl decanoate and ethyl butyrate/ethyl octanoate.
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    Optimal machine parameters to maximize the accuracy of producing aluminum dovetails using WEDM
    (Elsevier, 2017) Oberholzer, J. F.; Oosthuizen, G. A.; De Wet, P.
    Dovetail joints are one of the strongest joining methods used to connect two perpendicular components together. Dovetail joints are predominantly used in wooden components but can also be found in other non-wood components and products such as lathes, turbine blades, clock gears, and large 3D printed components. The manufacturing of these joints have largely been done by CNC milling machines that use specialized tools. The objective of this study was to determine the optimal machine parameters to produce a dovetail joint in Aluminum 7075-T6 plate with the highest accuracy as possible using a WEDM process. The experimental results were analyzed through ANOVA and the optimal results were presented. Further work is also discussed to incorporate the manufacturing time into the model.
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    South African Forest Road Handbook Chapter 1 : Introduction Chapter 2 : Road Planning Appendixes : Glossory Equation List
    (2005) Brink, M. P.; Slate, J.; Ackerman, P.; De Wet, P.; Harrington, P.; Jones, D.; Shuttleworth, B.
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    Strategies to standardise bamboo for manufacturing process chains
    (Elsevier, 2017) Burger, M. D.; Oosthuizen, G. A.; Oberholzer, J. F.; De Wet, P.; Ras, C. I.
    The manufacturing challenges industry face need to be addressed in the multifaceted context of sustainability. In order to stay relevant and competitive the manufacturing industry is investigating several types of sustainable hybrid materials for structural components. Bamboo is a versatile plant with thousands of applications, but is produced in various shapes and sizes with different mechanical characteristics. Therefore, the objective of this study is to investigate strategies to standardise bamboo for manufacturing process chains. The treatments that bamboo must undergo in order to be used in high quality and resilient products were investigated. Sustainable and environmental friendly approaches to deal with pests and different drying methods of bamboo are discussed. Factors to be standardized are identified and strategies to standardize this in each phase before the manufacturing process chains are elaborated on. Benchmarking is done on the diameter and wall-thickness of the different tubes and an allowable variance is identified for each tube.
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    Sustainably manufacturing a bamboo bicycle in a container factory
    (Elsevier, 2017) De Wet, P.; Oosthuizen, G. A.; Burger, M. D.; Oberholzer, J. F.
    In order for manufacturing suppliers to stay competitive in the global market, innovative and resource efficient process chains need to be a part of the manufacturing strategy. Secondary manufacturing process steps entail the assembly and surface treatment manufacturing steps, after the primary cutting and shaping of the components. Bicycles have an enormous effect on society, both in terms of socio-economics and of advancing modern industrial processes. In order to manufacture bamboo bicycle frames in South Africa, innovative designs and process chains need to be developed. Container factories could be the answer to reduce costs and increase resource efficiency. In this study, the feasibility of manufacturing bamboo bicycle in shipping containers is investigated. These results are then used to evaluate the sustainability of manufacturing bamboo bicycles in container factories.