Author:Nabarro, FRN; Wilsdorf, DKDate:Dec 1996The internal stresses induced by the strain gradients in an array of lattice cells delineated by low-angle dislocation boundaries are partially relieved by the creation of new low-angle boundaries. This is shown to be a first-order transition, ...Read more
Author:Millroy, LDate:Feb 2011The term “nucleic acid therapy” encompasses a wide range of technologies for the treatment of a range of plant and animal ailments. As the name implies, it makes use of nucleic acid (either DNA or RNA) as a therapeutic agent. There are six ...Read more
Author:Millroy, L; Khati, MDate:Sep 2011HIV/AIDS and TB are among the major infectious diseases and defining public health problems in developing countries. This book aims to give an overview of the epidemiology and also provide an understanding of the pathology of these diseases. ...Read more
Author:La Grange, CCDate:1957Subsequent to the issue of this Institutes Technical Memorandum No. 10 of 1955 the results of additional investigations carried out at the Institute on No. Seam coal taken in the ventilation shaft, about 4500ft north- north-east of Springbok ...Read more
Author:Molapo, R; Barnard, EDate:Nov 2014The purpose of this paper is to address the challenges and describe step-by-step solutions faced when developing an automatic speech recognition system in multilingual societies. We give a brief statistical analysis of the data that have been ...Read more
Author:Meyers, Bronwyn C; Grobler, Jan-Hendrik; Snedden, GCDate:Sep 2022A combustor was designed for a 200N micro-gas turbine for the model aircraft industry using the NREC design method. Multiple designs resulted which varied in terms of annular area split configuration, hole area splits and relative hole ...Read more
Author:Loveday, PW; Long, Craig SDate:Nov 2022Guided wave ultrasound has been used to continuously monitor welded rail track by transmitting guided wave ultrasound between alternate transmit and receive stations along the rail. A section of rail was encountered where transmission was not ...Read more
Author:Long, Craig S; Loveday, Philip WDate:Apr 2012The analysis of travelling waves in elastic waveguides with complex cross-sections, such as train rails, can only conveniently be performed numerically. The semi-analytical finite element (SAFE) method has become a popular tool for performing ...Read more
Author:Loveday, Philip WDate:Mar 2006Guided wave ultrasonic inspection is becoming an important method of non-destructive testing for long, slender structures such as pipes and rails. Often it is desirable to use transducers that can strongly excite a specific mode of wave ...Read more
Author:Motsepe, K; Fedotov, I; Shatalov, M; Joubert, SVDate:Sep 2008Students of mathematical physics, engineering, natural and biological sciences sometimes need to use special functions that are not found in ordinary mathematical software. In this paper a simple universal numerical algorithm is developed to ...Read more
Author:Long, Craig S; Loveday, Philip WDate:Jan 2014A guided wave based monitoring system for welded freight rail, has previously been developed. The existing system was designed to only detect complete breaks. Current research efforts are focused on including a pulse-echo mode of operation ...Read more
Author:Dunn, Dwain I; Von Backström, TWDate:Aug 2011Turbine manufacturers are continually striving to improve turbine performance, and thus reduce emissions, which has been accelerated with the inception of the Kyoto protocol. One of the areas that have received attention is the controlling ...Read more
Author:Long, Craig S; Loveday, Philip W; Forbes, A; Land, KDate:Jan 2010For intra-cavity laser beam control, a small, low-cost deformable mirror is required. This mirror can be used to correct for time- dependent phase aberrations to the laser beam, such as those caused by thermal expansion of materials. A ...Read more
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