Author:Trollip, NGDate:Oct 1985The discovery of heterogeneous stereospecific catalyst systems by Ziegler and Natta 1953 heralded the birth of a wide variety of new polymers such as highly crystalline (isotactic) polypropylene.Read more
Author:Galuszynski, SDate:May 1986Sewing, as a means of joining two or more fabrics to make a garment or other article is likely to remain the most common and versatile method in the foreseeable future. For the purpose of this publication the seam pucker is defined as a ...Read more
Author:Kuhn, AHDate:1973This report contains all the required information, but is kept as condensed as possible to facilitate the making of similar tests on Van Dyks slurry.Read more
Author:Fuel Research InstituteDate:1957This second progress report is a continuation of Technical Memorandum No. 7 of 1957 and should be read in conjunction therewith. This report deals with tests on Sasol/Satmar mixtures and Sasol/Alcohol mixture.Read more
Author:Van der Merwe, JMDate:1954A segregation and breakage test was carried out on pea-duff coal and the results are summarized in the present report.Read more
Author:Getz, WA; Starfield, AMDate:Dec 1975The construction of a linear compartmental model of the savanna ecosystem at Nylsvley is discussed. Using crude estimates for the standing crop of the compartments and intercompartmental flow rates the sensitivity of the model to changes in ...Read more
Author:Van Eeden, GSDate:1963With a view of the production of smokeless fuels, tests were conducted to determine the rate at which coal particles can be heated without disintegrating.Read more
Author:De Beer, Morris; van der Merwe, CJ; Rohde, GTDate:Sep 1997This report contains a set of practical course notes on the Rehabilitation Design of flexible pavements in southern Africa based on extensive research by various researchers and / or practitioners in South Africa. The course is intended for ...Read more
Author:Miller, DGMDate:1986This document summarizes South Africa's participation in SIBEX-II and outlines some of the results obtained. South Africa's participation in SIBEX-11 was aimed at providing a temporal comparison with an Australian oceanographic overview of ...Read more
Author:Joubert, FEDate:1972The report details the attempts to assess the value of surveys of dust conditions in collieries that may constitute explosion hazards are presented in this discussion.Read more
Author:Estuarine and Coastal Research UnitDate:Sep 1982Various charts and title deeds give the name of the river as the Zilvermyn rivier, Silver Mijn Stream or Silvermynrivier. The name Silvermine apparently originates from attempts in the 1680s to mine silver in the valley through which this ...Read more
Author:Kruger, FJ; Miller, PM; Miller, J; Oechels, WCDate:Mar 1985This report outlines progress with the development of computer based dynamic simulation models for ecosystems in the fynbos biome. The models are planned to run on a portable desktop computer with 500 kbytes of memory, extended BASIC language, ...Read more
Author:Steyn, WJvdM; De Beer, Morris; Du Preez, WDate:Jul 1999The HVS IV+, its history, specifications and capabilities are introduced in this paper, and compared to that of the HVS Mark III. The development of some HVS instrumentation are discussed. Definitions are proposed for a description of the ...Read more
Author:Raab, GADate:1972At Tweefontein United Collieries Limited, coal is won from No. 2 and No. 4 seams. The coal is hand-loaded underground into tube and arrives at the tipplers via the Western shaft and the Klipplaat shaft.Read more
Author:Raab, GADate:1973Anthracite mined from four sections of the seam and hand-loaded into tubs arrives at the surface via the haulage adit. The total discard amounts to approximately 23 to 24 per cent, 3 to 4 per cent of which arrives from the picking belt. leaving ...Read more
Author:Van der Walt, PJDate:1956In South African, coal is generally screened into the nominal commercial sizes such as rounds, cobbles, nuts, peas and duff.Read more