Author:Gaigher, LDate:1977Corrosion factors for boilers were calculated for some South African coal product samples using Borio's formula in which "accessible" alkalies were replaced by the total alkalies from the ash analysis.Read more
Author:Kennedy, DADate:Jan 1991Relationships of speed vs density, volume and percentage loop occupation are investigated. The effect of differing directional splits in traffic volumes is also examined. A method of determining the Level-of Service of two-lane roads in terms ...Read more
Author:Netterberg, F; Paige-Green, PDate:Apr 1984The problem of deterioration of lime, lime-slag and cement stabilized pavement layers during curing, before sealing and in service is partly ascribed to carbonation of the stabilizer during curing and subsequent exposure to the atmosphere ...Read more
Author:Turner, PADate:Aug 1987This report discusses the occurrence of falls of ground in strike gullies. Falls of hangingwall over strike gullies on the up-dip side of strike stabilizing pillars in longwall mining systems were investigated. Gullies were examined in both ...Read more
Author:Grobler, TL; Ackermann, ER; Van Zyl, AJ; Olivier, JCDate:Oct 2011The authors use Cavalieri's principle to develop a novel integration technique which they call Cavalieri integration. Cavalieri integrals differ from Riemann integrals in that non-rectangular integration strips are used. In this way they can ...Read more
Author:Paige-Green, P; Netterberg, FDate:Jun 2004The introduction of the SABS EN 197-1 (SANS 50197-1) specification for cements in South Africa resulted in a change in the range of cements available for material stabilization for road layers. An investigation was carried out to assess the ...Read more
Author:Sanders, PJ; De Beer, Morris; du Plessis, HWDate:26 May 2009Various aspects of the determinations and use of elastic moduli of pavements materials are herein addressed. Included is an investigation into the sensitivity of pavement life to changes in elastic material parameters, an update of moduli ...Read more
Author:Fuel Research InstituteDate:1954As explained in previous communications, the Institute has been of the option that the difficulties experienced with the Dense Medium Washery at South African Coal Estate could be largely attributed to changes in the properties of the heavy ...Read more
Author:Tarboton, WRDate:Sep 1977A provisional avifaunal checklist based on observations made during the period September 1974 to July 1976 is presented. Of 325 species recorded, 197 are classified as resident, 64 as migrant, 14 as sporadic, 13 as vagrant while 37 are of ...Read more
Author:Beyers, E; Van Rooyen, DDate:1950Comparatively few investigators have studied the reaction of halogens with coal. Evidence was found that substitution and addition reactions occur and that more hydrochloric or hydro bromic acid may be formed than could be explained by a ...Read more
Author:Savage, W.H.D; Savage, WHDDate:1957The "International Classification of Hard coals by type", published by the United Nations in 1956, consists of primary classification by volatile matter content up to 33% volatile matter (dry ash free) and by calorific value (moist ash free) ...Read more
Author:Atkins, ARDate:Jan 1968The design and calibration of an ergometer for exercising subjects during calorimetric studies in the climate chamber, are described. The ergometer is built into the climatic chamber and forms an integral part of the whole instrumentation ...Read more
Author:SANCORDate:Jan 1978With the ever-increasing demands on the resources of our planet, man's attention during recent years has turned more and more to the resources of the ocean and it is being increasingly recognised that the proper exploitation and conservation ...Read more
Author:Gray, DDate:1978The COED-process, a fluidized-bed pyrolysis coal conversion technique, is described in considerable detail. Using Illinois 6 coal as feedstock for the process, the coal is taken through the pyrolysis stages to produce a raw pyrolysis oil. ...Read more
Author:Maasdorp, APB; Black, WADate:Apr 1983The photochemical degradation of unpigmented and unstabilised polypropylene films can be monitored coloremetrically following reaction of the carbonyl groups produced, with 2,4-dinitrophenylhydrazone produced under acidic conditions.Read more
Author:Van Doornum, G.A.WDate:1968Many smokeless fuels are of low reactivity and thus not very suitable for use in open fire places as the ignition delay is unduly long and rate of heat release is low. It would appear that these properties may be modified in a favorable sense ...Read more
Author:Van Doornum, GAWDate:1967The object of the tests was to compare the relative effectiveness of these fuels and to observe any ash content and the presence of a high proportion of dull material.Read more
Author:Quass, FWDate:1946In order to establish the relative suitable for steam raising purposes of South African anthracite, firing tests were carried out in an experimental furnace on a number of nut size largely on the anthracite.Read more