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Amenability of some Witbank bituminous ultra fine coals to binderless briquetting

Author: Mangena, SJ ; De Korte, GJ ; McCrindle, RI ; Morgan, DL Date: 15 Oct 2004 Five ultra fine bituminous coals from the Witbank coalfield were studied. Selected chemical and physical properties, coal petrographic characteristics and mineralogical compositions of the coals were measured. The coals were compacted, using ... Read more
Appraisal of numerical methods in predicting the aerodynamics of forward-swept wings

Author: Lombardi, G ; Salvetti, MV ; Morelli, Mauro F Date: Jul 1998 The capabilities of different numerical methods in evaluating the aerodynamic characteristics of a forward-swept wing in subsonic and transonic now are analyzed. The numerical results, obtained by means of potential, Euler, and Navier-Stokes ... Read more
Biological sulphate removal from acid mine effluent using ethanol as carbon and energy source

Author: Greben, HA ; Maree, JP ; Singmin, Y ; Mnqanqeni, S Date: 2000 Mining effluents are major contributors to mineralization of receiving waters and can be toxic to man, animals and plants due to unacceptably high concentrations of heavy metals. A biological sulphate removal process has been developed for ... Read more
Building a capacity building manual

Author: Clinton, DD ; Cleland, A ; Botha, D ; Nagussey, D ; Lewis, S ; Day, P ; Wall, K Date: Feb 2010 Sustainable engineering infrastructure and services are the basic cornerstones of life, civilization and economic wellbeing of communities. Across the world, there is a huge deficiency in capacity to understand the need for, how to develop, ... Read more
Catalytic skeletal isomerization of linear butenes to isobutene

Author: Butler, AC ; Nicolaides, CP Date: 31 Dec 1993 The increased demand for isobutene, used for the production of the octane-enhancer methyl tert-butyl ether, has generated tremendous interest in the catalytic conversion of the linear butenes to isobutene. In this review we survey the progress ... Read more
Catastrophic failure of a raise boring machine during underground reaming operations

Author: James, A Date: Mar 1997 This paper describes the investigation of the catastrophic failure of a raise boring machine used for underground reaming operations. The results of the investigation indicate that failure was due to the fracture of the 32 drive head bolts, ... Read more
Char production from bank coal for gas producer

Author: Myburhg, JJ Date: 1975 In August 1974, it was requested by the Combustion Department to produce a suitable char for use in their gas producer. It was decided to use Bank coal. The coal was washed at the Coal Preparation Pilot Plant on 19th Jul½ 1974 at a relative ... Read more
Comparison between sucrose, ethanol and methanol as carbon and energy sources for biological sulphate reduction

Author: Greben, HA ; Maree, JP ; Mnqanqeni, S Date: 2000 Sulphate was reduced via sulphide to sulphur when operating a single-stage completely mixed reactor configuration feeding synthetic feed. The aim of this study was to determine the volumetric and specific sulphate reduction rates using sugar, ... Read more
Creep failure of a spray drier

Author: Carter, P Date: Jun 1998 NDT, design calculations and metallurgical analysis were performed on specimens from a collapsed spray drier. Failure modes initially regarded as possible were: corrosion leading to reduced sections and loss of strength, fatigue and fracture, ... Read more
Delineation of rockburst fractures with ground penetrating radar in the Witwatersrand Basin, South Africa

Author: Grodner, M Date: Sep 2001 The depth of mining in the gold mines of the Witwatersrand Basin, South Africa is continuously increasing, with several mines already stopping at depths exceeding 3500m. Due to the high stresses imposed on the rock mass in these deep level ... Read more
Detection of the incipient oxidation of coal by petrographic techniques

Author: Kruszewska, KJ ; Du Cann, VM Date: May 1996 Two petrographic methods, namely long-wave fluorescence intensity measurements and a vitrinite elasticity index were developed and used to detect incipient oxidation in coals subjected to simulated weathering conditions. The two methods are ... Read more
Developing and implementing norms and standards

Author: Wall, K Date: Oct 2010 Capacity building needs to relate to specific norms and standards, the achievement of which is, or should be the objective of building the capacity. Putting it simplistically, it should be ascertained what activities, what services, what ... Read more
Development of South African water quality guidelines for the natural aquatic environment

Author: MacKay, HM ; Roux, DJ ; Ashton, PJ ; Van Vliet, HR ; Jooste, S Date: 1995 This paper describes the progress made by the Department of Water Affairs and Forestry in the development of documented water quality guidelines for aquatic ecosystems in South Africa, which will be able to take into account local and ... Read more
Diffraction of an inhomogeneous plane wave by an impedance wedge in a lossy medium

Author: Manara, G ; Nepa, P ; Kouyoumjian, RG ; Taute, BJE Date: Nov 1998 The diffraction of an inhomogeneous plane wave by an impedance wedge embedded in a lossy medium is analyzed. The rigorous integral representation for the field is asymptotically evaluated in the context of the uniform geometrical theory of ... Read more
Discrete fracture in quasi-brittle materials under compressive and tensile stress states

Author: Klerck, PA ; Sellers, EJ ; Owen, DRJ Date: 2004 A method for modelling discrete fracture in geomaterials under tensile and compressive stress fields has been developed based on a Mohr-Coulomb failure surface in compression and three independent anisotropic rotating crack models in tension. ... Read more
Effect of boehmite alumina nanofiller incorporation on the morphology and thermal properties of functionalized poly(propylene)/polyamide 12 blends

Author: Ogunniran, ES ; Sadiku, R ; Ray, Suprakas S ; Luruli, N Date: Aug 2011 A composite of boehmite alumina nanoparticles and a PP/PA12 blend is prepared. WAXD and SEM suggest that a low filler loading enhances the coalescence of PA12, whereas a higher loading reverses the situation. DSC, DMA and TGA reveal that the ... Read more
The effects of microstructure on crack initiation in liquid-metal environments

Author: Fernandes, PJL ; Jones, DRH Date: Sep 1997 Liquid-metal-induced embrittlement under tensile test conditions is identified by the existence of a characteristic ductility trough. In this study, the effect of molten gallium on the behaviour of two brass alloys with different microstructures ... Read more
Engineering: issues, challenges and opportunities for development

Author: Wall, K Date: Oct 2010 The critical roles of engineering in addressing the large-scale pressing challenges facing our societies worldwide are widely recognized. Such large-scale challenges include access to affordable health care; tackling the coupled issues of ... Read more
Estimation of the fate of microbial water-quality contaminants in a South-African river

Author: Hohls, D ; Du Plessis, G ; Venter, SN ; Steynberg, MC ; De Wet, CME ; Rodda, N ; Kfir, R Date: 1995 The aim of this study was to evaluate the validity of assumptions, regarding assimilative capacity for microbial contaminants, implicit in microbial water quality management in South Africa. A one dimensional steady state stream water quality ... Read more
Experiences of South African high school girls in a fab lab environment

Author: Dlodlo, N ; Beyers, RN Date: Jan 2009 This paper reports on an effort to address the issue of inequality in girls' and women's access to science, engineering and technology (SET) education and careers through raising awareness on SET among secondary school girls in South Africa. ... Read more

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Browsing by Subject "Engineering"

Browsing by Subject "Engineering"

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