Search Results - "Potgieter, J. H."

Raman spectroscopy for the analysis of coal: a review by Potgieter-Vermaak, S., Maledi, N., Wagner, N., Van Heerden, J. H. P., Van Grieken, R., Potgieter, J. H.

“…The advances in the characterization of amorphous carbons by Raman spectroscopy over the last four decades are of interest to many industries, especially those…”
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Influence of nickel additions on the corrosion behaviour of low nitrogen 22% Cr series duplex stainless steels by Potgieter, J.H., Olubambi, P.A., Cornish, L., Machio, C.N., Sherif, El-Sayed M.

“…Four 22% Cr duplex stainless steel alloys containing varying nickel contents of approximately 5%, 7%, 9% and 13% were melted in a vacuum induction furnace, hot…”
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Torque and Voltage Quality in Design Optimization of Low-Cost Non-Overlap Single Layer Winding Permanent Magnet Wind Generator by Potgieter, J. H. J., Kamper, M. J.

“…The main focus of this paper is cost-effective techniques to reduce the cogging torque in permanent magnet (PM) wind generators. However, there are also…”
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Design of New Concept Direct Grid-Connected Slip-Synchronous Permanent-Magnet Wind Generator by Potgieter, J. H. J., Kamper, M. J.

“…This paper deals with the modeling, the design, and the construction of a new concept slip-synchronous permanent-magnet (PM) wind generator for direct-drive…”
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The corrosion behaviour of WC-VC-Co hardmetals in acidic media by Konadu, D.S., Merwe, J. van der, Potgieter, J.H., Potgieter-Vermaak, S., Machio, C.N.

“…The effect of increasing vanadium carbide (VC) content on the corrosion behaviour of tungsten carbide – 10 wt% cobalt hardmetals was investigated in 1 M…”
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The beneficial effect of ruthenium additions on the passivation of duplex stainless steel corrosion in sodium chloride solutions by Sherif, El-Sayed M., Potgieter, J.H., Comins, J.D., Cornish, L., Olubambi, P.A., Machio, C.N.

“…The effect of varying ruthenium contents of 0.00, 0.14, 0.22, and 0.28% on the corrosion of 22%Cr–9%Ni–3%Mo duplex stainless steel (DSS) after different…”
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The application of Raman spectrometry to investigate and characterize cement, Part I: A review by Potgieter-Vermaak, S.S., Potgieter, J.H., Van Grieken, R.

“…Raman spectrometry has received attention for the past 3 decades in its application to the characterisation of pure cement phases, white and grey cements…”
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A kinetic and thermodynamic investigation into the removal of methyl orange from wastewater utilizing fly ash in different process configurations by Potgieter, J. H., Pardesi, C., Pearson, S.

“…The removal of methyl orange using coal fly ash, which is a widely available low-cost adsorbent, has been investigated. Adsorption studies for dye removal were…”
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Effects of minor additions of ruthenium on the passivation of duplex stainless-steel corrosion in concentrated hydrochloric acid solutions by Sherif, El-Sayed M., Potgieter, J. H., Comins, J. D., Cornish, L., Olubambi, P. A., Machio, C. N.

“…The effects of minor additions of ruthenium (0.14%, 0.22%, and 0.28%) on the passivation of duplex stainless-steel (DSS, Fe–22%Cr–9%Ni–3%Mo) corrosion in 2 M…”
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INVESTIGATIONS ON THE MECHANISMS OF SULFURIC ACID LEACHING OF CHALCOPYRITE IN THE PRESENCE OF HYDROGEN PEROXIDE by Olubambi, P. A., Potgieter, J. H.

“…The sulfuric acid leaching behavior of chalcopyrite in the presence of hydrogen peroxide was studied at 25°C using electrochemical techniques. The effects of…”
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An investigation into the effect of various chemical and physical treatments of a South African phosphogypsum to render it suitable as a set retarder for cement by Potgieter, J.H., Potgieter, S.S., McCrindle, R.I., Strydom, C.A.

“…The work describes various physical and chemical treatments to eliminate the deleterious effects of impurities in phosphogypsum on the delayed setting time and…”
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Dissolution kinetics of quicklime in various organic solvents and solutions by Potgieter, J. H, Gregory, H

“…The rate of the dissolution of quicklime was measured in different organic solvents and solutions of methanol, ethylene glycol, glycerol and sucrose. It was…”
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Insulin glulisine, a new rapid-acting insulin analogue, displays a rapid time-action profile in obese non-diabetic subjects by Becker, R H A, Frick, A D, Burger, F, Potgieter, J H, Scholtz, H

“…This study compared the pharmacokinetics and pharmacodynamics of insulin glulisine, insulin lispro, and regular human insulin in obese subjects. In this…”
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Role of ore mineralogy in optimizing conditions for bioleaching low-grade complex sulphide ores by OLUBAMBI, P.A., NDLOVU, S., POTGIETER, J.H., BORODE, J.O.

“…The role that ore mineralogy plays in understanding and optimizing the conditions favouring the bioleaching of complex sulphide ore containing high amounts of…”
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Double PM-Rotor, Toothed, Toroidal-Winding Wind Generator: A Comparison With Conventional Winding Direct-Drive PM Wind Generators Over a Wide Power Range by Potgieter, Johannes H. J., Kamper, Maarten J.

“…The double rotor, toothed, toroidal-winding permanent-magnet (PM) machine is not a well known concept and has received very limited attention in literature. In…”
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An evaluation of selected waste resources for utilization in ceramic materials applications by Jonker, A., Potgieter, J.H.

“…Many industrial processes generate large amounts of waste. Typical examples include the fertiliser industry (phosphogypsum), ferro-alloy and steel producers…”
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Calculation Methods and Effects of End-Winding Inductance and Permanent-Magnet End Flux on Performance Prediction of Nonoverlap Winding Permanent-Magnet Machines by Potgieter, Johannes H. J., Kamper, Maarten J.

“…Due to the short end windings of nonoverlap winding permanent-magnet (PM) machines, the end-winding inductance component is generally ignored in the design. In…”
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A comparison of the performance of various synthetic gypsums in plant trials during the manufacturing of OPC clinker by Potgieter, J.H., Potgieter, S.S., McCrindle, R.I.

“…This paper compares the plant performances of various synthetic gypsums used as set regulators in cement. The decision about the suitability of a specific…”
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A characterisation of the surface properties of an ultra fine fly ash (UFFA) used in the polymer industry by Potgieter-Vermaak, S.S., Potgieter, J.H., Kruger, R.A., Spolnik, Z., van Grieken, R.

“…Fly ash is the residue from the combustion of pulverised coal in thermal power stations. It consists of a variety of particle sizes of hollow silica-alumina…”
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Effects of ore mineralogy on the microbial leaching of low grade complex sulphide ores by Olubambi, P.A., Ndlovu, S., Potgieter, J.H., Borode, J.O.

“…The effect of ore mineralogy on the microbial leaching of low grade complex sulphide ores was investigated by utilizing mineralogical data on the variations in…”
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