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No description available.

Thesis (Ph.D.) -- University of Western Sydney, Hawkesbury, 1998. / Includes bibliographical references (leaves 228-245).

Major Project and Report (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaf 73). Also available via the Internet.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Abstract. Includes bibliographical references (leaf 113). Also available via the Internet.

Project report (M. Eng.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 80-101). Also available via the Internet.

Project report (M. Eng.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (80-81). Also available via the Internet.

The aqueous extract from the bark of the black wattle tree, (Acacia mearnsii De Wild)(1), is used extensively in the tanning industry for the production of sole and other heavy leathers as well as in lighter leathers and skins. The commercial extract is available in an easily dissolvable spray dried form and in deference to its genus name Mimosaceae is referred to in the trade as Mimosa(3). Mimosa extract consists primarily of high molecular weight polymeric flavonoid units which also constitutes the active tanning ingredient. Lower phenolics, gums and sugars or the so called "non-tannins" are present as impurities and contribute up to 40% to (3 ) the total mass of the extract.

This thesis examines the practical engineering problems associated with high-activity radioactive waste disposal. It includes a critical review of all the available disposal options, but focuses on concepts involving deep underground burial in purpose-built repositories. The construction and waste containment properties of crystalline, argillaceous and saliferous host rocks are examined and some inherent uncertainties in predicting their performance as natural barriers to radionuclide migration are described. It is shown that repository construction can introduce anomalous migration paths via peripheral zones of disturbance, rock/backfill separation planes and structural linings unless special preventative measures are taken. For jointed rock masses, it is shown that repository excavations may short-circuit natural flow paths. Repository design proposals from the major nuclear power-producing countries are reviewed, with particular emphasis on crystalline rock repository systems. It is shown that although the international proposals demonstrate the broad feasibility of repository construction, they generally fail to achieve optimum solutions in terms of waste containment. For jointed rocks, an optimisation study is described which demonstrates how adjustment of pre-disposal strategies for conditioning high-level wastes, altering the construction sequence, and manipulating the emplacement configuration can effect reductions in repository size to mitigate against the adverse effects of discontinuities. It is shown that applying the minimum repository size philosophy to other host rocks can also produce benefits in terms of waste containment and construction costs, and some radical design alternatives are proposed incorporating relevant principles. The role of engineered barriers, in the form of high-integrity backfills and waste unit claddings, is examined. Potentially suitable backfills are identified by reference to geochemical stability and radionuclide containment properties, and cost implications are evaluated. Parametric sensitivity studies are performed to demonstrate the influence of waste unit and backfill properties on radionuclide containment, and some new practical design concepts and emplacement techniques are suggested.

The world has an energy problem and the root cause of this problem is the growing world population and the energy consumption per capita. The main source of energy, oil, is gradually running out. The use of coal, oil and fossil energy sources are polluting the planet with greenhouse gasses (GHG).Internationally waste disposal facilities are currently providing energy to industry and humans. This research determines if waste disposal facilities in South Africa can produce a viable source of energy. The exploratory research process involved structured interviews with key informants and experts in the waste disposal facility management in South Africa. A survey questionnaire was sent to waste disposal facility managers and this questionnaire was close-ended questions. The structured questionnaire consisted mainly of open-ended questions. The data collected from the questionnaires and the surveys were analysed through descriptive statistics and content analysis. The results of the research were that waste disposal facilities in South Africa, not all, could produce energy that can be integrated into the Eskom grid, and will also contribute significantly in the reduction of harmful GHG, and to the Clean Development Mechanism. / Dissertation (MBA)--University of Pretoria, 2010. / Gordon Institute of Business Science (GIBS) / unrestricted