Browsing Theses and Dissertations (Chemical Engineering) by Supervisor "Focke, Walter Wilhelm"
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Browsing Theses and Dissertations (Chemical Engineering) by Supervisor "Focke, Walter Wilhelm"
Now showing items 1-20 of 48
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(University of Pretoria, 2017)The development of pyrethroid resistance in mosquitoes threatens the goal of malaria elimination in Africa. Alternative insecticides, e.g. organophosphates, can be considered to control pyrethroid resistant mosquitoes. The ...
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(University of Pretoria, 2007-03-08)There are two industrial sources of zirconia: zircon and baddeleyite [1-5]. The baddeleyite reserves in Phalaborwa (the world’s major baddeleyite source) are expected to be depleted by the year 2005 [1-3]. This leaves the ...
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(University of Pretoria, 2006-09-13)This study was directed at the pyrotechnic time delay compositions that are used in detonator assemblies. The objectives were to: --Investigate effective alternatives for the barium and lead-based oxidants currently used, ...
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(University of Pretoria, 2007-08-21)This study considered the use of urea eutectics as fast release solid dosage carrier forms for the acaricide N-methylbis (2,4-xylyliminomethyl) methylamine (AmitrazTM). Wettol D2 and Arkopal N090 were chosen as the wetting ...
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(University of Pretoria, 2017)In the pursuit of lower cost intumescent flame retardant (IFR) systems, the compound expandable graphite (EG) was identified. This compound delivers high flame retardant performance but provides non-uniform thermal shielding ...
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(University of Pretoria, 2016)Microencapsulation of geraniol and wintergreen oil by the maize protein, zein, was investigated. The efficiency of encapsulation, the morphology of micro-particles and the controlled-release kinetics of the geraniol-zein ...
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(University of Pretoria, 2017)This research aimed to characterise the physico-chemical and structural properties of rectorite from a local deposit, the Beatrix Gold Mine in South Africa and to investigate its unique material properties. The ultimate ...
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(University of Pretoria, 2019)This research aims to contribute to the safe methodology for additive manufacturing (AM) of energetic materials. Coating formulation processes were investigated to find a suitable method that may enable selective laser ...
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(University of Pretoria, 2022-12)Pyrotechnic compositions are usually employed in time delay detonators to facilitate controlled initiation of explosive charges in mining and quarrying operations. Traditional fast and slow-burning formulations are ...
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(University of Pretoria, 2019)Malaria parasite infects more than 200 million people and about 435 000 succumb to the illness annually (WHO, 2019). Victims are mostly young children and pregnant women. It is transmitted by the bite of the infected female ...
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(University of Pretoria, 2005-04-20)Fedmis Pty (Ltd) situated in Palaborwa, South Africa produces phosphoric acid using the wet process production process. For this study, two main areas of concern in the wet process phosphoric acid production were investigated. ...
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(University of Pretoria, 2012-06-26)The insecticide dichloro-diphenyl-trichloroethane (DDT) is widely used in indoor residual spraying (IRS) for malaria control owing to its longer residual efficacy compared to other World Health Organization (WHO) alternatives. ...
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(University of Pretoria, 2020)Controlled-release formulations for pesticide applications act as depot systems that continuously release the active ingredients into the environment over a speci ed period, usually from months to years. However, some ...
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(University of Pretoria, 2011-10-10)The ignition temperature of the aluminium copper oxide (Al-CuO) thermite was measured using differential thermal analysis (DTA) at a scan rate of 50 °C/min in an inert nitrogen atmosphere. Thermite reactions are difficult ...
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(University of Pretoria, 2008-07-31)Please read the abstract in the section, 00front, of this document
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(University of Pretoria, 2017)The nature of letsoku and related clayey soils, traditionally used by indigenous Southern African communities for a wide range of purposes, was explored. Thirty-nine samples were collected from Botswana, Lesotho, Swaziland, ...
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Fatty acid intercalated layered double hydroxides as additives for Jojoba oil and polymer matrices (University of Pretoria, 2012)Fatty acid intercalated layered double hydroxides were used as additives for Jojoba oil and polymer matrices. The first phase of the study was to intercalate carboxylic acids (C14 to C22). These were successfully intercalated ...
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(University of Pretoria, 2017)The work herein covers the complete process for development, production and testing of a melt processable pyrotechnic composition, with the goal of using the composition as a printing material in a fused deposition modelling ...
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(University of Pretoria, 2018)The fire behaviour of linear low-density polyethylene composites containing 10 wt.% of different carbon-based fillers was studied. Cone calorimeter tests conducted at a heat flux of 35 kW_m_2 showed that the expandable ...
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(University of Pretoria, 2018)Pyrotechnic time delay elements are used in non-electric detonators for blasting operations in the mining and military industries. The improvement of time delay element consistency has been limited by inconsistent measurement ...
Now showing items 1-20 of 48