Engineering and Information Technology Collected Works - Theses
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ItemIgnition of brown coal particles(University of Melbourne, 1970)
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ItemNo Preview AvailableA geostatistical study of an iron orebody(University of Melbourne, 1978)
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ItemThe measurement of the concentration of benz(a)pyrene in the air of Melbourne(University of Melbourne, 1976)The work described in this report is a continuation of the investigations of Hannah1 and Cowdell2, into the concentration of benz(a)pyrene (BaP) in the air of Melbourne. These workers were unable to achieve accurate results due to limitations in the methods they employed. The method chosen for determining airborne BaP concentrations in this study consisted of high volume sampling of airborne particulates, Soxhlet extraction of the particulate samples, separation of the organic extract by two-dimensional thin layer chromatography, and spectrophotofluorimetric determination of the separated BaP. The steps in this method were investigated in order to determine the major causes of inaccuracies in the analysis. Significant losses of BaP were found to occur during particulate sample extraction and the evaporation of the solvent used to elute chromatographic adsorbent samples. These losses constituted the major limitation on the accuracy of the method. A means of avoiding or minimizing the loss due to the latter cause is suggested. A modified form of the two dimensional thin layer chromatographic separation technique was developed which made possible the simultaneous and complete separation of BaP from up to eight organic extract samples on a single 20 x 20 cm. TLC plate. This new technique is well suited to routine analyses for BaP. The concentration of airborne BaP was determined at an urban location in Melbourne during two one week sampling periods. The concentration of BaP at this location varied from 0. 1 to 1.0 ?g/1001 m3. These levels are similar to those reported for Toronto, a comparable city, but significantly lower than those reported for highly industrialized areas.
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ItemA study of the tensile rheology of linear and branched polyethylenes and the manner in which molecular characteristics determine the behaviour of polyethylene melts in processes which involve tensile deformations(University of Melbourne, 1975)A constant stress melt tensile rheometer and a device to test blow moulding parisons were constructed and used to evaluate the tensile melt flow behaviour of six high density polyethylenes (HDPE's) and two low density polyethylenes(LDPE's). The gel permeation technique was used to determine values of number and weight average molecular weight for the HDPE's. A cone and plate viscometer was utilized to evaluate the shear flow behaviour of the same polymers. The melt tensile viscosities of the HDPE's decreased as tensile stress was increased from 1 x 103 to 5 x 104 N/m2. In the same range of shear stress, the HDPE's displayed shear viscosities which also decreased with increasing stress. However, the Trouton�an relationship was not obeyed. For a temperature increase of from 150� to 190� C the melt tensile viscosities of the HDPE's decreased by as much as fifty percent, but the tensile elastic modulus remained basically constant. At 150�C, the melt tensile viscosities of the two LDPE's remained independent of, or increased with stress in the range 1 x 103 to 5 x 104 N/m2. The parison testing study showed that HDPE resins having narrow molecular weight distributions appear to give optimum parison dimensional uniformity and stability during blow moulding.
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ItemA survey of air pollutant emissions in Australia : 1962 to 1985(University of Melbourne, 1974)
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ItemStudy of airborne particulates in Melbourne metropolitan region(University of Melbourne, 1974)Using High volume sampler, the air in Melbourne Metropolitan region was sampled and analysed for total suspended particulates, particulate lead, sulphate and nitrate. The results were compared with important cities of the world. The thesis also consists of an exhaustive Literature Survey regarding airborne particulate pollution, its effects and the methodology of sampling and analysis.
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ItemThe mechanical properties of polymeric films cast from solution(University of Melbourne, 1971)The mechanical properties of polymeric films were investigated. The polymers were simple in nature and consisted mainly of poly-n-butyl methacrylate and polymethyl methacrylate, cast as films from solution. A series of poly-n-butyl methacrylates of different molecular weights was prepared and analysed and the effect of molecular weight on glass transistion temperature was determined and compared with theoretical correlations. The methods of mechanical testing included micro-indentation hardness, gravelometer and falling weight impact tests. The last two were carried out with a combination of films as well as with single film systems, and such tests are commonly used in the automotive lacquer industry. The three methods of test were assessed and suggestions for improvements have been made where necessary.
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ItemNo Preview AvailableReservoir outlets, spillways and basin shape characteristics : designs & studies(University of Melbourne, 1971)
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ItemInvestigation into dustfall distribution : basis for green belt planning(University of Melbourne, 1971)Increasing interest is being shown by people in general in the quality of the air they breathe and the water they drink. Research into the cleaning of industrial waste products, and the maintenance or improvement of environmental standards, is manyfold. Much attention has been given recently to the use of buffer zones around industry to protect the surrounding community from the less aesthetic properties of such industry. The following study was initiated to determine the feasibility of a green belt zone and its effectiveness in reducing pollution levels, by studying the dust fallout and concentration around an industry. It was concluded that undesirable levels of dust occured only in close proximity to the factory, with rapid dispersion occuring beyond a distance of one thousand feet. It was hence concluded that with due attention to the design and siting of an industry, a green belt of appropriate dimensions and vegetation cover has a great potential for alleviating the problem of pollution to a nearby community.
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ItemOptimisation and plastic analysis(University of Melbourne, 1969)