Thesis (Doctoral)--Universität Karlsruhe, 2000. / Hochschulschrift = Thèse/Mémoire. Also available via the World Wide Web. http://www.ubka.uni-karlsruhe.de/cgi-bin/psview?document=2001/physik/2

Thesis (Doctoral)--Universität Karlsruhe, 2000. / Abstract in German. Hochschulschrift = Thèse/Mémoire. Also available via the World Wide Web. http://www.ubka.uni-karlsruhe.de/cgi-bin/psview?document=2001/physik/2

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The growth in renewable electricity generation is forecast to continue as fossil fuel levels decrease and carbon dioxide emissions are penalized. The growth in geothermal is becoming constrained as conventional high-temperature sources are fully exploited. Geothermal can be a cost competitive base load power source. Governments and utilities are looking at the potential of electricity generation from low temperature geothermal resources for future development. This technology, unlike the high and medium temperature, is not mature and there are a number of companies looking at entering the Organic Rankine Cycle (ORC) market. This thesis aims to provide a necessary step for reliable commercial develop this technology by developing the first draft of a low temperature geothermal ORC standard. The standard outlines the critical stages of a geothermal ORC project as the Prospecting stage; Pre-Feasibility stage, Feasibility stage, and the Detailed Design stage. The standard is unlike other standards that are used to design one component; this standard guides the engineers though the various critical steps of the ORC design to correctly assess the geothermal resource and to inform design and investment decisions. The standard provides particular guidance on critical factors in ORC design, primarily the working fluid selection and component selection limitations. Experienced industry engineers have provided advice and insight regarding the critical design points and processes. The draft standard was reviewed by a number of geothermal industry engineers who have worked with large scale, conventional ORCs. They each commented on the standard from their prospective in the industry and gave general feedback was that it is a technically relevant standard that can be used as a potential start point to develop a new standard for the low temperature binary ORC industry. The final draft standard has been submitted to the ISO for consideration. This thesis first sets out the general background on the state of the art and the industry for lowtemperature binary ORC power plants, and provides the review assessment of the standard draft. However, the bulk of the thesis is the standard itself. The standard represents a substantial contribution to the mechanical and thermal systems engineering field.

Mining and mineral exploration have been a source of considerable tension in the developing world and specifically where they take place on indigenous lands. This thesis investigates the nature of the relationships between different stakeholders to a mineral exploration project in Fiji. It is an examination of the obstacles to community participation, a key component of even-handed development, in the planning and policy-making process. It is argued that the Namosi exploration project has been the locus for emergent social disruption. It is also argued, that the causes of this conflict are anchored in a flawed process of policy-making between the state and exploration companies and the contest for authority between key actors, which has led to the disempowerment of some villagers from both within and outside the community. Equally, the political ideology of the state and the contentious history of mining in Fiji, have played a part in the tendency towards social conflict in association with minerals exploration. / The starting point for analysis has been a comparison with the social conflict literature as it applies to Papua New Guinea. The purpose has been first, to confirm the relevance of that work to situations encountered in Fiji, and second, to provide a broader critique of the literature than previously available; one that further develops understanding of social conflict related to natural resource development. Given the circumstances of state and village politics in Melanesia, the question is asked, whether the normative 'fully realised communities' anticipated by Selznick in his communitarian idyll can be achieved. The thesis concludes that the nature of community involvement in development planning for mineral exploitation, creates a very different type of participation than that outlined in the literature of mining corporations and states. Although some actors have recourse to other means of empowering themselves, this is not a prelude to development for the wider community.

Twenty-one Schlumberger resistivity soundings were performed on the island of Maui. Analysis consisted of one-dimensional modeling using an automatic ridge-regression inversion algorithm (Anderson, 1979). The inversion results were compared with available well-log information and geologic maps in order to make geologic interpretations. The soundings were conducted primarily to estimate the depth to and the electrical resistivity of, seawater-saturated basalt for different parts of the island. The resistivity of seawater-saturated basalt on Maui ranges between 3.5 and 60 ohm-meters. The lowest values occurred near Ukumehame canyon, on the south rift zone of West Maui. In this area, which is the site of a warm water (33°C) well, the computed resistivity for seawater-saturated basalt is about 4 ohm-m. Using typical Hawaiian basalt porosity values of 15% to 25%, Archie's Law implies temperatures of between 62° and l7loC at depths below 200 meters in the Ukumehame area. Freshwater piezometric heads were estimated from the sounding data. The largest freshwater head (91 m) was obtained in Keanae valley. The inferred large volume of freshwater is perched on Keanae alluvial valley fill and is observed in a well (W100) towards the back of the valley. All other freshwater heads are under 4 m, indicating that the freshwater lens is rather thin near the coast at the areas surveyed. / ill / maps

Graduation date: 1994

ix, 271 leaves : ill. (chiefly col.), maps (col.), photographs (col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library / This thesis analyses in situ stress and overpressure throughout Brunei. The resultant in situ stress and pore pressure data is applied to establish the neotectonic evolution of the Baram Delta province and resolve a variety of current geomechanics issues affecting petroleum exploration and production in the region / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1097072 / Thesis(PhD)- National Centre for Petroleum Geology and Geophysics, 2003