Author:Ferrar, AADate:1989This document contains the proceedings of a workshop which was convened to debate the ecological flow requirements of South African rivers. Topics which are discussed include the influence of weirs and impoundments, the quantity requirements ...Read more
Author:Gandar, MVDate:Nov 1983An annotated checklist is given of 60 species of Acridoidea which were found on the Nylsvley Nature Reserve. The density of a species may change greatly over small distances, altering the population species composition. Vegetation structure ...Read more
Author:O'Keeffe, JHDate:1986Ecological research on South African rivers has progressed in a number of phases. Until 1950 work was mainly taxonomic and descriptive, an essential prerequisite for more detailed studies. The realisation that South African rivers, a vital ...Read more
Author:Wehmeyer, ASDate:Aug 1986Transporting fresh material, with as little deterioration as possible from the field to the laboratory is always a problem. This is especially the case with soft fruits which are easily bruised and leaves which quickly lose moisture. Fruits ...Read more
Author:Grindley, JRDate:Dec 1982This report provides historical information on Eerste River, catchment, abiotic and biotic characteristics. The Eerste River rises on Dwarsberg 60 km east of Cape Town as the head of Jonkershoek. The river catchment covers the eastern part ...Read more
Author:Savage, WHDDate:1969No corresponding determination were made on the same samples at the two temperatures, so that no valid comparison can be made.Read more
Author:Muller, EFEDate:1963The aim of this investigation is to examine at least two other coking coals which, however, differ appreciably in their coking properties as determined in the laboratory.Read more
Author:Van Eck, B; Savage, WHDDate:1951In the present investigation samples of approximately cobble sized coal from five typical collieries in the major coal fields were taken.Read more
Author:Muronga, KhangweloDate:Feb 2017The Naturalistic Driving Studies (NDS) are research methods that have the ability to improve existing methods for collecting data about driver performance and driver behaviour in normal driving conditions. The purpose of this research is to ...Read more
Author:Savage, WHDDate:1950The work incorporated in this report was undertaken because of the introduction of new grading regulations governing the export of col from the Union, in which minimum analytical requirements for the several grades of coal were laid down.Read more
Author:Moodie, B; La Grange, CCDate:1958By applying the Burstlein principle of controlled crushing and screening to coal from Blesbok Collier it is possible to obtain a product of lower ash and higher swelling number but it is probably preferable to effect these improvements in the ...Read more
Author:Brown, ACDate:1985This review of international literature on the biological effects of crude oil pollution in the sea relevant to the South African situation is based on some hundred selected referenced.Read more
Author:Le Roux, Lukas JDate:Aug 2009Dye-sensitised solar cells (DSC) have attracted much attention during the last few years due to their high efficiencies and their potentially low production costs. The technology is based on a thin layer of nano sized, high band gap (3.2 eV) ...Read more
Author:Davis, PC; Small, JCDate:1964A range of experiments was done to investigate the influence of the distance of the impeller from the bottom of the cell on the product yield and ash content of the products.Read more
Author:Davis, PCDate:1963An investigation was conducted to determine the effects of factors on the floatability of small samples of Greenside coal.Read more
Author:Mwila, Martin KDate:Aug 2014Wireless technologies have been rapidly spreading all around the world and have become embedded in most of our modern technologies. Mobility, portability, low cost, and the ease of network installation are the key features that have recently ...Read more
Author:La Grange, JH; La Grange, CCDate:1971The electrically powered car, on the other hand, not only causes no air pollution, but is also silent and requires little attention and maintenance. In addition, electric power distributors throughout the world should welcome the use of off ...Read more
Author:Smith, Andrew CDate:Mar 2009In this document the author reports on research done in the field of Embedded Interaction as well as events at which the public was exposed to this research. The author also reports on the dissemination of the research results, being mostly ...Read more
Author:Wright, CDate:Feb 2011BHP Billiton Mozambique Aluminium Smelter (MOZAL) experienced structural damage to the Fume Treatment Centre (FTC) caused by unanticipated corrosion. As a result MOZAL was in the process of rebuilding the FTC, an exercise that entailed a ...Read more