Institutional Repository | North-West University | NWU: Recent submissions
Now showing items 18801-18820 of 35819
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Young adults' experiences of their transition from residential care to independent living
(North-West University (South Africa) , Potchefstroom Campus, 2015)Against the background of various challenges faced by young adult care leavers and ongoing debates on care leaving interventions in contemporary South Africa, the researcher aimed to explore five selected participants’ ... -
Dissolution kinetics of South African coal fly ash and the development of a semi-empirical model to predict dissolution
(Association of the Chemical Engineers of Serbia AChE, 2015)Wet flue gas desulphurization (FGD) is a crucial technology which can be used to abate the emission of sulphur dioxide in coal power plants. The dissolution of coal fly ash in adipic acid is investigated by varying acid ... -
Occupational stress and mental well-being in a cohort of black South African teachers
(National Inquiry Services Centre (NISC), 2014)This study explored levels of occupational stress and mental well-being of a cohort of Black South African teachers. 200 secondary school teachers completed the Teacher Stress Inventory (TSI: Boyle, Borg, Falzon, & ... -
The properties of large coal particles and reaction kinetics of corresponding chars
(Elsevier, 2015)An investigation was undertaken to determine the distribution of chemical-, petrographic- and mineralogical properties of large coal particles of different sizes and densities and to evaluate a suitable reaction rate model ... -
Proposal for improved nuclear fuel utilisation and economic performance by utilising thorium
(Univ Cape Town, Energy Research Centre, 2015)A systematic and strategic nuclear power reactor deployment roadmap has been developed for South Africa within the national strategic plan, utilizing thorium-based fuel. The roadmap was developed through analysis of ... -
Evaluation of the Berman-Olander long-bowl gas centrifuge solution
(Taylor & Francis, 2015)The hydrodynamic equations for a long-bowl gas centrifuge can be simplified to obtain a one-dimensional differential equation for the variation of the non-dimensional axial velocity in the radial direction. In this study ... -
Synthesis of high-purity precipitated calcium carbonate during the process of recovery of elemental sulphur from gypsum waste
(Elsevier, 2015)We recently showed that the production of elemental sulphur and calcium carbonate (CaCO3) from gypsum waste by thermally reducing the waste into calcium sulphide (CaS) followed by its direct aqueous carbonation yielded ... -
Pore development during gasification of South African inertinite-rich chars evaluated using small angle X-ray scattering
(Elsevier, 2015)Pore development arising from steam and CO2 gasification of a char, prepared from an inertinite-rich Witbank Seam 4 coal, was investigated using small angle X-ray scattering. The char, ∼75 μm, was gasified to specific ... -
Water-only laboratory coal fractionation using the reflux classifier
(Elsevier, 2015)Due to health and environmental factors involved with standard float-sink analytical methods, a water-only fractionation procedure was investigated. A laboratory scale 105 × 105 mm reflux classifier was built and used to ... -
A laboratory scale fixed-bed coal conversion reactor. Part 1. Operation, reaction zone identification and industrial representativeness
(Elsevier, 2015)Fixed bed coal gasification and combustion operations form an important part in the global energy supply, and these processes are characterized by complex interactions which are difficult to study on an industrial scale. ... -
Reactivity study of fine discard coal agglomerates
(Elsevier, 2015)In this laboratory study thermo-gravimetric analyses were conducted to determine the influence of the addition of an alkaline metal catalyst (K2CO3 incorporated into a fine discard coal agglomerate mixture by physical ... -
Impact of a radio-frequency identification system and information interchange on clearance processes for cargo at border posts
(AOSIS, 2015)Background: Improved operational efficiency is important to role players in cross-border logistics and trade corridors. Cargo owners and cargo forwarders have been particularly concerned about long delays in the processing ... -
Sulphur trioxide decomposition with supported platinum/palladium on rutile catalysts. 1. Reaction kinetics of catalyst pellets
(Elsevier, 2015)An investigation was undertaken to evaluate the intrinsic reactivity, stability and associated diffusional parameters of catalyst pellets consisting of platinum and palladium on rutile for the conversion of sulphur trioxide ... -
Performance evaluation of a high-throughput microchannel reactor for ammonia decomposition over a commercial Ru-based catalyst
(Elsevier, 2015)In this work, the prospect of producing hydrogen (H2) via ammonia (NH3) decomposition was evaluated in an experimental stand-alone microchannel reactor wash-coated with a commercial Ruthenium-based catalyst. The reactor ... -
Thermodynamical model for hydrogen storage capacity in carbon nanostructures
(Elsevier, 2015)A simple thermodynamical model taking into account non-ideality and inhomogeneity of absorbed hydrogen molecular gas has been proposed to calculate hydrogen storage capacity in carbon nanostructures as a function of ... -
A review on switched reluctance machines for electric vehicle
(IEEE, 2016)Nowadays, switched reluctance machines (SRM) are gaining interest in the scientific community due to the advantages they offer. The SRM offers an overall efficiency similar to an induction motor of the same rating, since ... -
Design of an intelligent controller for a renewable energy efficient bulk storage tank
(2015)The national electricity supplier in South Africa is experiencing difficulty in providing the required electricity, due to compliance with environmental regulations and the continuous price increase of commercial fuels. ... -
Design a thermoelectric cooling holder supplied by photovoltaic panels
(2015)In this paper, the development of a portable solar power vaccine carrier box for local usage in Africa and South Africa is described. The purpose is to provide guidance to the design of a thermoelectric cooling holder. An ... -
Base-line susceptibility of Busseola fusca for Bt maize in South Africa
(North-West University (South Africa), 2015)Genetically modified maize that express insecticidal proteins (Bt proteins) have been commercialized in South Africa for the control of Busseola fusca (Lepidoptera: Noctuidae). Busseola fusca has been reported to be ... -
Pastorale begeleiding van afgetredenes met betrekking tot hul eiewaarde in finansiële nood
(North-West University (South Africa) , Potchefstroom Campus, 2016)The South African community, like communities worldwide, is characterized by longevity. This results in a steadily increasing number of people still retiring in accordance with the current retirement policy at the ages 60 ...
