Author:Long, Craig S; Loveday, Philip WDate:Sep 2012The semi-analytical finite element (SAFE) method has become a popular tool for the analysis of elastic waveguides with complex cross-sections. We employ a recently developed hybrid SAFE-3D FE method to study the scattering of guided waves at ...Read more
Author:Van de Steen, B; Vervoort, A; Napier, JALDate:Mar 2001A two-dimensional boundary element code, based on the displacement discontinuity method is used to simulate a confined compression test. The method takes account of the granular nature of the rock and of the presence of pre-existing defects. ...Read more
Author:Lightfoot, N; Maccelari, MDate:Mar 1999This report covers the production of a general reference handbook of numerical
modelling for the South African mining industry, with particular reference to the gold and platinum industries. It also covers a research sub-project investigating ...Read more
Author:Lightfoot, N; Maccelari, MDate:Sep 1999The SIMRAC project GAP629 has two aspects. Firstly, the production of an updated edition of the guidebook Numerical Modelling of Mine Workings. The original document was launched to the South African mining industry in April 1999. Secondly, ...Read more
Author:De wet Strydom, JPDate:Aug 2000The main objective of this thesis was the development and testing of a concept that can potentially be implemented on a rock drill to attenuate the operating frequency of a rock drill. The concept must be able to account for minor changes in ...Read more
Author:Greben, JM; Cooper, Antony K; Gledhill, Irvy MA; de Villiers, RDate:Nov 2008The authors have applied various numerical techniques to describe the stability of breakwater structures under the exposure of waves. These studies are intended to get a better understanding of the parameters playing a role in breakwater ...Read more
Author:Wilke, DN; Kok, SDate:Jul 2012This study considers the numerical sensitivity calculation for discontinuous gradientonly optimization problems using the complex-step method. The complex-step method was initially introduced to differentiate analytical functions in the late ...Read more
Author:Klein, Peter; Roos, T; Sheer, JDate:Sep 2010The implementation of thermal storage systems allows concentrating solar power plants to generate predictable power delivery to the grid by mitigating the variability of solar energy supply. However, while thermal storage solutions exist for ...Read more
Author:Napier, JAL; Malan, DFDate:Sep 2008Some of the key problems facing rock engineers on mines in the Bushveld Complex are design of stable panel spans, optimum pillar dimensions and assessing hangingwall stability. A particularly difficult problem is encountered in some mines ...Read more
Author:Mbanjwa, MBDate:Oct 2012Droplet-based microfluidic technology has, in recent years, found numerous applications in biology, chemistry, materials synthesis and process engineering applications. Alongside experimental work, numerical tools, such as computational fluid ...Read more
Author:Jansen van Rensburg, Gerhardus J; Bogaers, Alfred EJDate:Oct 2018During the optimal design and simulation of machining or forming processes, detailed simulation of structural response is typically required for use in Finite Element Analysis (FEA). In this study, the bulk temperature and rate dependent ...Read more
Author:Van den Heever, SC; D'Abreton, PC; Tyson, PDDate:Aug 1997Tropical-temperate troughs and their associated cloud bands have been modelled over southern Africa using the Regional Atmospheric Modelling System (RAMS). The correspondence between simulated fields and observational data for both the dry, ...Read more
Author:Haarhoff, LJ; Kok, S; Wilke, DNDate:Apr 2013Kriging is used extensively as a metamodel in multidisciplinary design optimization. The correlation matrix used in Kriging metamodeling frequently becomes ill-conditioned. Therefore different numerical methods used to solve the Kriging ...Read more
Author:Lysko, Albert A; Johnson, DDate:Jul 2008The present layout of the indoor wireless mesh network test-bed build at the Meraka Institute is introduced. This is followed by a description of a numerical electromagnetic model for the complete test-bed, including the coupling and diffraction ...Read more
Author:Long, Craig S; Loveday, Philip W; Ramatlo, Dineo AM; Andhavarapu, EVDate:Sep 2018Numerical verification of a method to simulate piezoelectric transducers exciting infinite elastic waveguides is presented. The method, referred to as SAFE-3D, combines a 3D finite element (FE) model of a transducer with a 2D semi-analytical ...Read more
Author:Scogings, PF; Hjalten, J; Skarpe, C; Hattas, D; Zobolo, A; Dziba, L; Rooke, TDate:Jan 2014Carbon-based secondary metabolites (CBSMs) such as tannins are assumed to function as plant defences against herbivores. CBSMs are thought to be inversely related to growth rate and nutrient concentrations because a physiological trade-off ...Read more
Author:Lemley, DA; Taljaard, Susan; Adams, JB; Strydom, NDate:Oct 2014This study provides an overview of the nutrient status of river inflow into the estuaries within the Gouritz Water Management Area (WMA) of South Africa. Riverine inputs are a major source of macronutrients to estuaries and the adjacent coastal ...Read more
Author:Wehmeyer, ASDate:17 Dec 1966The nutrient content of 9 species of wild fruits growing in the Transvaal was determined in the laboratory were the research was conducted. In order to simplify the removal of the flesh from the stones, the fruits were in most cases freeze-dried ...Read more
Author:Adams, JB; Taljaard, Susan; Van Niekerk, Lara; Lemley, DADate:Feb 2020Nutrient pollution in South African estuaries is described using a Driver-Pressure-State-Impact-Response framework. The root cause (‘driver’) of deteriorating water quality is rapid population growth that leads to increasing inputs from ...Read more