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Browsing by UP Author "De Vaal, Philip L."
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Massinga, Pedro Horacio; Focke, Walter Wilhelm; De Vaal, Philip L.; Atanasova, Maria Todorova (Elsevier, 2010-07)Organo-bentonites containing quaternary ammonium surfactants were prepared using purified bentonite from the Boane deposit in Mozambique. The intercalation was effected by intimate mixing of the surfactants into a concentrated ...
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Burger, Nicolaas Daniel Lombard; De Vaal, Philip L.; Meyer, Josua P. (Elsevier, 2007-10)Retrievals obtained after revision surgery, provide valuable information on the rate of wear and the causes of wear that take place in vivo. The aim of this study was to perform a root cause failure analysis to determine ...
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De Clerk, D.J.; De Vaal, Philip L. (Southern African Institute of Mining and Metallurgy, 2012-04)Global trends stipulate the need to optimize existing assets while reducing environmental impacts. This paper illustrates the procedure that was followed to achieve such goals at one of the coal burning flash dryer units ...
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Moller, Vivian P.; De Vaal, Philip L. (Taylor & Francis, 2014-09)Changes occurring in the friction and wear mechanisms during a load-carrying capacity test, lubricated with cetane containing a carboxylic acid, were investigated. The changes in wear scar/track appearance and oxide ...
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Gous, Gustaf Zacharias; De Vaal, Philip L. (Elsevier, 2012-09)Traditionally the tuning of dynamic matrix control (DMC) type multivariable controllers is done by trial and error. The APC engineer chooses arbitrary starting values and tests the performance on a simulated controller. ...
Now showing items 1-5 of 5