Author:Meintjies, AADate:1967A preliminary study was made of the application of pyrolysis-gas chromatography to coal dust. A correlation between the explosibility index of a coal and the nature of its volatile matter would prove useful.Read more
Author:Meintjies, AA; Van Der Berg, FDate:1968The object of this investigation was to determine whether a correlation could be found between the known explosive properties of coal dusts and the nature, quantity and temperature dependence of volatile matter formation.Read more
Author:Sevenster, PG; Steenkamp, JHDate:1967In this report an account is given of a new technique developed at the Fuel Research Institute whereby the methane evolved from a coal sample is automatically measured and analyzed. The method utilizes a gas detector of high sensitivity to ...Read more
Author:Sevenster, PG; Joubert, JHDate:1967One of the research projects undertaken to establish the cause of the apparent inactivity of South African coal dusts when subjected to the explosibility tests designed by the U.S.B.M. was to study the influence of methane content of the coal ...Read more
Author:Stavropoulos, CCDate:Sep 1977The telemetering of information over long distances from unattended environmental monitoring equipment at remote sites can be difficult to carry out using conventional high frequency radio communication. This is because of the need to change ...Read more
Author:Grobbelaar, C.S; Billinggum, P.ADate:1975The most basic function of a building is to protect its occupants and their possessions from the weather. It is no wonder therefore that a leaking root, or finishes marred by dump, leave the owner feeling cheated- his building isn’t doing the ...Read more
Author:Billingham, PADate:1977When man first began to build shelters for himself about 800 years ago he concentrated on providing effective walls and roof. The floor go-t scant attention because it was already provided by the earth. The first soft floor coverings ware ...Read more
Author:Donaldson, GW; Billingham, PADate:1973The words ‘built on a firm foundation' have become part of the language and most people would unhesitatingly agree that a house has to have a foundation' without perhaps understanding exactly why. If one were to place an open wooden box upside ...Read more
Author:Addis, B.JDate:1980Paving is used to cover ground to eliminate dust, mud or erosion and to facilitate the movement of traffic. It can also be used to control the moisture content of the underlying soil around houses built on unsable soil such as heaving clay. ...Read more
Author:Ferreira, T.M; Billingham, P.ADate:1973The difference between sound and noise varies from one human being to another. Noise, then, is simply unwanted sound and to understand how it can be combatted we must know more about its nature. A guide of acceptable levels of noise are investigated.Read more
Author:Cromarty, R.E; Billingham, P.ADate:1985Thousands of years ago primitive man made use of some of the colourful materials that he found around him to stain his body and clothing. He also decorated the walls of his cave with pictures of hunters and wild animals drawn with these ...Read more
Author:Ferreira, TDate:1979Home owners often complain that traffic noise disturbs their indoor peace and quiet. It is difficult, expensive and probably unnecessary to make the whole house soundproof. To appreciate and apply the practical tips that follow later, it is ...Read more
Author:Billingham, P.ADate:1977It has become fashionable to talk of 'energy crisis' but in fact there is still no shortage of energy - if one is prepared to pay the price. This situation, however, cannot continue indefinitely because our limited supplies coal and oil are ...Read more
Author:Cawood, WNDate:1976Since primitive man first set fire to a heap of twigs to warm his cave, mankind has been making use of the earth's energy resources. Fortunately, we still have the sun, which offers us an inexhaustible source of non-polluting energy.Read more
Author:Lotz, F.J; Billingham, P.ADate:1974Too many people need to switch on the air-conditioning every time the sun comes up and light a fire as soon as it does down again. The sun is a wonderful source of energy that comes free of charge to all of us.Read more
Author:Long, KDate:1978Thatch has been used as a roofing material from the earliest times. The basic tools of the thatcher's craft have not changed over hundreds of years. Thatching is a craft that is traditionally handed down from father to son.Read more
Author:Brown, CJ; Macdonald, IAW; Brown, SEDate:1985The greatest threat of invasion of alien species of plants and animals is posed by species which originate from similar arid habitats in other parts of the world. In general the smaller the number of individuals of an alien species introduced ...Read more
Author:Macdonald, IAW; Jarman, MLDate:1985This report consists of two types of chapters. Most of the chapters are short syntheses of particular aspects of the alien plant problem in Natal, written by groups of participants during the workshop meeting. They are brief accounts of the ...Read more
Author:Boucher, C; McDonald, AEDate:Sep 1982A comprehensive list of plant communities described by various authors within the Fynbos Biome geographic area is given. The list is divided into two sections. Section I consists of plant communities described over a wide geographical area. ...Read more
Author:Focke, RWDate:Feb 2015The findings presented in this thesis support the hypothesis that Interval Algebra (IA), as a temporal reasoning language, should perform scheduling of sensor dwells efficiently and effectively. Scheduling of multistatic radars was identified ...Read more