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
Author:Copeman, JH; Von Wolff, WTEDate:1965Because of the effect of inorganic impurities on the utilization of coal, it was decided to carry out a survey on the minerals present in production samples from different mines.Read more
Author:La Grange, CCDate:1965The purpose of this investigation was in the firs instance to determine what yields of low ash products could be expected from the duffs, such products to be suitable.Read more
Author:Pandelani, Thanyani ADate:Jun 2014In this study, the responses of the HIII and MiL-Lx surrogate legs were evaluated at several blast loading conditions using the Modified Lower Limb Impactor. The impact tests were conducted using a lower limb impactor with the leg mounted ...Read more
Author:Mametja, MBDate:Nov 2008FT-IR and FT-Raman spectra of 1,1,1-trichlorethane (CH3CCl3) were recorded in the regions 400 – 3500 cm-1 and 200 – 3500 cm-1 respectively. The observed vibrational numbers were analysed and assigned to different normal modes of vibration of ...Read more
Author:Blitz, JG; Uys, JM; Petrick, AJDate:1950The introduction of oil mixtures for impregnating timber in which penta-chloro-phenol is the active medium and kerosene the major vehicle component caused some apprehensive that explosive mixtures might be formed in the impregnation vessels.Read more
Author:Hibbert, ADate:1968From observations made during investigations with the D.S.M cyclone there was reason to believe that the cut point with a given feed was liable to change depending on whether the feed was we or dry-screened immediately before washing.Read more
Author:Archer, Emma RM; Dziba, LE; Mulongoy, KJ; Maoela, Malebajoa A; Walters, MicheleDate:2018The Africa regional Assessment is the first of its kind for the continent and constitutes one of four Regional Assessments conducted under IPBES. This Assessment is a synthesis of the state of knowledge on biodiversity and nature’s contributions ...Read more
Author:ISCOR-SASOL-F.R.I. Steering CommitteeDate:1960Iscor- SASOL-FRI steering committee progress report covering the period February - May 1960 Investigations conducted at the Fuel Research Institute.Read more
Author:Heyl, L; Von Maltitz, Graham P; Evans, J; Segoale, RDate:2000The softwood sawmilling industry processes approximately 4.1 million m3 of pine logs every year. Small-scale sawmillers which account for 67% of the total number of establishments process only about 11% of the annual log intake. The major ...Read more