Author:Steenkamp, Anton J; Kienhofer, F; De Saxe, CCDate:Sep 2021Previous research investigating the dynamic road wear produced by heavy vehicles has not included the effect of road crossfall. This study shows that road crossfall, even at values as low as 1%, has a significant effect on the predicted dynamic ...Read more
Author:Du Plessis, L; Strauss, PJ; Perrie, BD; Rossmann, DDate:Jul 2006The paper addresses two different heavy Vehicle Simulator (HVS) studies conducted on concrete: Load transfer through aggregate interlock and the use of dowels and the evaluation of the performance of an in-service continuously reinforced ...Read more
Author:Viljoen, AW; Freeme, CR; Servas, VP; Rust, FCDate:Jul 1987Conventional overlay life estimates are often invalidated by the reflection of existing cracks in a pavement through an overlay. This is attributable to a lack of understanding of the factors influencing relative crack movements and their ...Read more
Author:Theyse, HL; Steyn, WJVDM; Sadzik, E; Henderson, MDate:Jun 2006Developing countries such as South Africa have an urgent need to create road infrastructure for rural access and urban mobility. Many of these roads will operate under low traffic volumes and only require a sealed, light pavement structure. ...Read more
Author:Du Plessis, L; Coetzee, NF; Burmas, N; Harvey, JT; Monismith, CLDate:Oct 2008The purpose of this paper is twofold. Firstly, it will provide a brief description of the technological developments involved in the Heavy Vehicle Simulator (HVS) accelerated pavement testing equipment. This covers the period from its conception ...Read more
Author:Jones, DJ; Morton, BDate:Sep 2002Heavy Vehicle Simulator (HVS) operations have been performed by the CSIR for the past 25 years. During this period, experience has been gained with regards to the collection and storage of pavement behaviour data from accelerated pavement ...Read more
Author:Rust, FC; Du Plessis, L; Verhaeghe, Benoit MJA; Grobler, JEDate:Oct 1993Internationally, interest in accelerated pavement testing (APT) is increasing, in particular testing with mobile machines which allow the performance of in-service roads to be assessed. The Californian Department of Transportation (CALTRANS) ...Read more
Author:Du Plessis, L; Kohler, EDate:Jul 2007This paper focuses on results obtained from recent accelerated loading testing in California with a Heavy Vehicle Simulator (HVS) on a particular system of pre-cast slabs, referred to as SuperSlab. For heavily trafficked highways, such as ...Read more
Author:Cilliers, A; Nel, Willem AJDate:Sep 2008A technique based on time-frequency and tomographic analysis to extract helicopter blade parameters for the purposes of radar non-cooperative target recognition (NCTR) is investigated. The proposed algorithm shows that (under certain conditions) ...Read more
Author:Wright, C; Diab, RD; Binedell, MLDate:Oct 2008Air quality management plans identify prioritised strategies and actions independent of any consideration of population exposure and vulnerability. This is seen as a major shortcoming, particularly in a country such as South Africa where ...Read more
Author:Dudeni-Tlhone, N; Ramoelo, Abel; Debba, Pravesh; Cho, Moses A; Mathieu, Renaud SADate:Nov 2012Feeding patterns and distribution of herbivores animals are known to be influenced by quality and quantity of forage such as grass. Modelling indicators of grass quality and biomass are critical in understanding such patterns and for decision ...Read more
Author:Malibo, Pretrus M; Makgwane, Peter R; Baker, PGLDate:Jul 2021Herein we report on the catalytic activity of hetero-mixed TiO2-SnO2 nano-oxide catalyst for the selective liquidphase oxidation of furfural to maleic acid using H2O2 oxidant. The high surface area and strong interaction of the two oxides ...Read more
Author:Mkhize, NM; Sithole, Bishop B; Ntunka, MGDate:Jun 2015The present study indicates that solid acid catalysis of crude tall oil (CTO) over a WO3/ZrO2 catalyst is effective in converting the CTO fatty acids components into biodiesel in high yield. Preparation of the catalyst by an impregnation ...Read more
Author:Mamuru, SA; Ozoemena, KIDate:May 2010Electron transfer and oxygen reduction dynamics at nanostructured iron(II) phthalocyanine/multi-walled carbon nanotubes composite supported on an edge plane pyrolytic graphite electrode (EPPGE-MWCNT-nanoFePc) platform have been reported. All ...Read more
Author:Nkosi, D; Pillay, J; Ozoemena, KI; Nouneh, K; Oyama, MDate:Jan 2010The electron transfer dynamics and electrocatalytic behaviour of ferrocene-terminated self-assembled monolayers (SAMs), co-adsorbed with single-walled carbon nanotubes (SWCNTs) on a gold electrode, have been interrogated for the first time. ...Read more
Author:Bohlin, C; Jonsson, LJ; Roth, Robyn L; Van Zyl, WHDate:Sep 2006Laccases are copper-containing phenol-oxidizing enzymes that are useful in many different applications, for example in lignocellulose processing and textile industry. Efficient and convenient systems for heterologous expression are needed for ...Read more