Search Results - "van Dyk, J.C."

DDT contamination from indoor residual spraying for malaria control by Van Dyk, J.C., Bouwman, H., Barnhoorn, I.E.J., Bornman, M.S.

“…The insecticide DDT is still used in specific areas of South Africa for indoor residual spray (IRS) to control malaria vectors. Local residents could be…”
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Coal and coal ash characteristics to understand mineral transformations and slag formation by Van Dyk, J.C., Benson, S.A., Laumb, M.L., Waanders, B.

“…A knowledge of the composition and structure of minerals in coal is necessary in order to understand the mineral transformations and agglomerate or slag…”
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Influence of discard mineral matter on slag–liquid formation and ash melting properties of coal – A FACTSAGETM simulation study by van Dyk, J.C., Keyser, M.J.

“…The ash fusion temperature (AFT) profile of a coal is one of the parameters currently widely used in coal marketing and utilization to assess coal ash…”
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Histological changes in the liver of Oreochromis mossambicus (Cichlidae) after exposure to cadmium and zinc by van Dyk, J.C., Pieterse, G.M., van Vuren, J.H.J.

“…The toxic effects, of two heavy metals, cadmium (Cd) and zinc (Zn), on the histology of the liver of the southern African freshwater fish Oreochromis…”
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Viscosity predictions of the slag composition of gasified coal, utilizing FactSage equilibrium modelling by van Dyk, J.C., Waanders, F.B., Benson, S.A., Laumb, M.L., Hack, K.

“…Agglomeration of ash particles provides the desired porosity of the ash bed for adequate agent (steam and oxygen) flow and distribution, whereas excessive…”
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Protein and fat meal content increase insulin requirement in children with type 1 diabetes – Role of duration of diabetes by van der Hoogt, M., van Dyk, J.C., Dolman, R.C., Pieters, M.

“…•Calculation of mixed meal insulin need in type 1 diabetes children is challenging.•This home-based study demonstrated that for a typical cooked dinner: fat…”
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Intersex in feral indigenous freshwater Oreochromis mossambicus, from various parts in the Luvuvhu River, Limpopo Province, South Africa by Barnhoorn, I.E.J., van Dyk, J.C., Pieterse, G.M., Bornman, M.S.

“…This study reports on intersex in Oreochromis mossambicus, an indigenous fish species inhabiting most aquatic systems throughout South Africa (SA). Male fish…”
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Manipulation of gasification coal feed in order to increase the ash fusion temperature of the coal enabling the gasifiers to operate at higher temperatures by van Dyk, J.C., Waanders, F.B.

“…Coal is a crucial feedstock for South Africa’s unique synfuels and petrochemicals industry and used by Sasol as a feedstock to produce synthesis gas via the…”
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A histology-based fish health assessment of the tigerfish, Hydrocynus vittatus from a DDT-affected area by McHugh, K.J., Smit, N.J., Van Vuren, J.H.J., Van Dyk, J.C., Bervoets, L., Covaci, A., Wepener, V.

“…► First study in Africa where levels of DDT in fish were related to fish health. ► High levels of DDT detected were not associated with adverse health effects…”
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Chemical fractionation tests on South African coal sources to obtain species-specific information on ash fusion temperatures (AFT) by van Dyk, J.C., Baxter, L.L., van Heerden, J.H.P., Coetzer, R.L.J.

“…Coals from the different sources used by Sasol vary substantially in terms of chemical and physical properties and directly relates to gasifier behavior. Due…”
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Effect of wet screening on particle size distribution and coal properties by Govender, A, van Dyk, J.C

“…Wet screening is one of the methods used to remove fine material from the coal feed to gasification. Sasol Synfuels in South Africa undertook an investigation…”
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Liver histopathology of the sharptooth catfish Clarias gariepinus as a biomarker of aquatic pollution by van Dyk, J.C., Cochrane, M.J., Wagenaar, G.M.

“…► The liver histopathology reflected the pollution status of the freshwater systems. ► Fish from polluted sites had a higher prevalence of histopathological…”
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Organochlorine pesticide levels in Clarias gariepinus from polluted freshwater impoundments in South Africa and associated human health risks by Barnhoorn, I.E.J., van Dyk, J.C., Genthe, B., Harding, W.R., Wagenaar, G.M., Bornman, M.S.

“…•Clarias gariepinus muscle tissue bio-accumulated organochlorine pesticides.•Predicted risk of developing cancer is higher than the recommended safe value of…”
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Prevalence of coeliac disease in children and adolescents with type 1 diabetes mellitus in a tertiary hospital in South Africa by Karsas, M, Terblanche, A J, Kemp, T, van Dyk, J C

“…Background International literature has shown the prevalence of coeliac disease (CD) in children and adolescents with diabetes to range from 1 - 10%…”
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Production of sodium-based zeolites and a potassium-containing leach liquor by alkaline leaching of South African coal fines ash by Collins, A.C., Strydom, C.A., Matjie, R.H., Bunt, J.R., van Dyk, J.C.

“…South African coal discards derived from feed coal for thermoprocesses pose human health and environmental problems and incur high disposal costs. These issues…”
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Mineral matter transformation during Sasol-Lurgi fixed bed dry bottom gasification – utilization of HT-XRD and FactSage modelling by van Dyk, J.C., Melzer, S., Sobiecki, A.

“…Coal is generally accepted to be a heterogeneous resource where coal properties can vary extensively between geographical sites or within a mine. However,…”
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Production of Al(HI)-K(I)-Ti(IV)-sulphate-containing leach liquor from metakaolinite-containing ash derived from South African coal fines by Collins, A.C., Strydom, C.A., Matjie, R.H., Bunt, J.R., van Dyk, J.C.

“…South African discard coal fines and K2CO3 blends were heated in a laboratory-scale rotary kiln to produce ashes for H2SO4 leaching tests. The optimized H2SO4…”
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Conceptual use of vortex technologies for syngas purification and separation in UCG applications by Brand, J.F., van Dyk, J.C., Waanders, F.B.

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Understanding the influence of acidic components (Si, Al, and Ti) on ash flow temperature of South African coal sources by van Dyk, J.C.

“…Ash flow temperature is one property that specifically gives more information on the suitability of a coal source for combustion or gasification purposes…”
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The influence of the roof and floor geological structures on the ash composition produced from coal at UCG temperatures by Uwaoma, R.C., Strydom, C.A., Matjie, R.H., Bunt, J.R., van Dyk, J.C

“…The mineralogy of the ash and slag formed at typical UCG temperatures were investigated using a bituminous coal from the Theunissen UCG site in the Free State…”
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