Author:Britz, K; Casini, G; Meyer, T; Varzinczak, IDate:Jul 2013We extend the Description Logic ALC with preferential role restrictions as class constructs, and argue that preferential universal restriction represents a defeasible version of standard universal restriction. The resulting DL is more expressive ...Read more
Author:Duncker, Louiza CDate:Aug 2006The CSIR has been investigating users' perceptions and attitudes towards urine diversion sanitation (UDS) in South Africa for the past seven years. The main findings were that people were aware of the fertiliser value of faeces but not of ...Read more
Author:Van Tienhoven, AM; Zunckel, M; Emberson, L; Koosailee, A; Otter, LDate:Mar 2006Surface ozone concentrations in southern Africa exceed air quality guidelines set to protect agricultural crops. This paper addresses a knowledge gap by performing a preliminary assessment of potential ozone impacts on vegetation in southern ...Read more
Author:Harrison, TDDate:2002The biogeography of the fishes of 42 South African estuaries was investigated using an extensive synoptic dataset collected over the period 1993-99. Fish species richness was low on the west (Atlantic Ocean) coast and high in estuaries on the ...Read more
Author:Van Wilgen, BW; Le Maitre, David C; Reyers, B; Schonegevel, L; Richardson, DMDate:2006Despite significant advances in the science of invasion ecology, surprisingly little is known about the magnitude of the impacts of invasions. The work described in this paper aims to develop spatially explicit databases of both ecosystem ...Read more
Author:Meyers, Bronwyn CDate:Oct 2015This study involves the redesign of the combustor liner for a 200N mini gas turbine engine using first principles and the design methods of the NREC series as shown in Figure 1. The combustor design was performed using five different operating ...Read more
Author:Ramukhwatho, Fhumulani R; Du Plessis, R; Oelofse, Suzanna HHDate:Dec 2017This study assessed the potential drivers of household food wastage in the City of Tshwane Metropolitan Municipality. A total of 210 participants were interviewed face-to-face using structured questionnaire. The acquired data were captured ...Read more
Author:Scott, DF; Smith, REDate:Apr 1997Mathematical models to predict runoff reductions due to afforestation are presented. The models are intended to aid decision-makers and planners who need to evaluate the water requirements of competing land uses at a district or regional ...Read more
Author:Paige-Green, PDate:Aug 2010The recycling of existing stabilized road pavement layers is becoming increasingly common as the South African road network ages and is being continually rehabilitated. In addition, large quantities of old concrete road, building rubble and ...Read more
Author:Nzekwe, IT; Azodo, VI; Agubata, CO; Naicker, B; Okore, V; Esimone, CODate:Feb 2015Chloroquine, a once useful therapy, currently faces problems of plasmodial resistance mediated through a number of mechanisms, such as P-glycoprotein (P-gp) mediated drug efflux, which makes attainment of adequate drug levels impossible. In ...Read more
Author:Paige-Green, P; Turner, DDate:Nov 2008During the feasibility and planning stages of infrastructure projects, the early identification of problem materials that could affect the project can save significant costs and or redesigns later in the project. As the potentially most ...Read more
Author:Backeberg, Bjorn-Christoph; Johannessen, J; Rouault, Marjolaine J; Veitch, JDate:Jul 2010The greater Agulhas Current is a highly dynamic regime that is known to have significant influence on the local marine environment and ecosystem. It is also recently recognized to play an important role in the global thermohaline circulation, ...Read more
Author:West, NJ; Jandrell, IR; Forbes, ADate:2006This paper describes the preliminary small-scale experiments conducted in order to investigate the influence of intensely focused laser light produced by a CO2 laser on high voltage fields. The laser used operated at a maximum energy of 430 ...Read more
Author:Rapeti, T; Backeberg, BjörnDate:Oct 2016Data assimilative ocean models play crucial roles in furthering the understanding, and providing forecasts of the Agulhas Current system. This study investigates the impact that assimilating sea surface temperatures (SST) combined with sea ...Read more
Author:West, NJ; Jandrell, IR; Forbes, ADate:Aug 2007In this research, an orthogonally laser-triggered spark gap is investigated. The laser beam is directed in the region of a 30mm spark gap at 90 degrees to the gap and focused on the axis. The influence of plasma position within the spark gap ...Read more
Author:Clark, D; Darazs, MDate:1976The Institute was asked by Dr K O R Gebardt, (consultant to APA), to investigate the Sulphur balance of a single-stage gas producer, fueled with anthracite.Read more
Author:Daehnke, A; Le Bron, KB; Van Zyl, MDate:Oct 1999The aim of this project is to formulate a basis for quantifying support mechanisms, and specifically to gain insights into the influence of rock discontinuities on stable spans. The work gives a preliminary analysis of the support interaction ...Read more
Author:Azeez, MA; Andrew, JE; Sithole, Bishop BDate:Oct 2015Two common Nigerian-grown biomasses, gmelina (Gmelina arborea) and bamboo (Bambusaa vulgaris) have been pulped and their fibre characteristics and paper properties examined. The results of their chemical compositions showed some fair similarities. ...Read more
Author:Slinger, JH; Taljaard, SusanDate:Oct 1994The hydrodynamics and water quality of the Great Berg Estuary were studied under river flow conditions typical of the winter and summer seasons. Results reflect a strongly seasonal regime with the estuary exhibiting fluvial dominance during ...Read more