This thesis investigates the timing and mechanisms involved in the formation of evaporite piercement structures on Ellef Ringnes Island, Canadian Arctic Archipelago. The study includes the interpretation of industry seismic reflection and borehole data to characterize the geometry of the domes, 1D backstripping of wells to investigate the role of tectonic influences on diapirism, and analogue modelling to better understand the mechanisms that drive diapirs with dense anhydrite caps. I propose that basement structures played a significant role in the formation of evaporite domes by triggering and directing salt movement. The domes developed during the Mesozoic by passive growth driven by the differential loading of salt on adjacent fault blocks, which led to their present day asymmetric geometries. Diapir growth rates in the Mesozoic were closely linked to the rate of sedimentation, which was greatly influenced by the amount of accommodation space provided by tectonic subsidence of the basin.

This thesis investigates the timing and mechanisms involved in the formation of evaporite piercement structures on Ellef Ringnes Island, Canadian Arctic Archipelago. The study includes the interpretation of industry seismic reflection and borehole data to characterize the geometry of the domes, 1D backstripping of wells to investigate the role of tectonic influences on diapirism, and analogue modelling to better understand the mechanisms that drive diapirs with dense anhydrite caps. I propose that basement structures played a significant role in the formation of evaporite domes by triggering and directing salt movement. The domes developed during the Mesozoic by passive growth driven by the differential loading of salt on adjacent fault blocks, which led to their present day asymmetric geometries. Diapir growth rates in the Mesozoic were closely linked to the rate of sedimentation, which was greatly influenced by the amount of accommodation space provided by tectonic subsidence of the basin.

Thesis (Ph. D.)--University of Washington, 2005. / Vita. Includes bibliographical references (p. 89-94).

Thesis (M.Sc.)--Memorial University of Newfoundland, 1993. / Typescript. Bibliography :l. 302-314. Also available online.

This dissertation studies the viability of one alternative building system as an option to conventional low-income housing. The need for research in this regard has been expressed by various government committees and commissions of inquiry, as well as by the private sector, to be of vital importance in facing the future housing challenge in southern Africa. The study is largely confined to black housing. The search for a form of shelter which combines traditional black low-technology and innovative Wes tern high-technology in a successful marriage, brings the geodesic dome to light. The conclusion reached is that in economic, technical and cultural terms, the dome compares favourably with conventional low-income housing. The social acceptance of the structure is a topic of research beyond the scope of this study.

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Concave surfaces are often considered to be detrimental or precarious in room acoustics, especially because of the impact they have on the distribution of sound energy. However, it is often difficult to avoid such surfaces in buildings with specific architectural functions. A primary example of this involves mosques, which are sacred places of worship for Muslims. In keeping with the Islamic architectural style, most mosques incorporate a symbolic centralized domed ceiling as part of their room structures. These domes are open on the bottom and coupled to the acoustic spaces below. In many cases, the lower spaces may be idealized rectangular enclosures. Owing to the distinctness and ubiquity of this basic architectural form, a thorough, fundamental analysis of such environments would be useful to the architectural acoustics community. In this study, predictions from EASE (trademark) computer models were compared to the results derived from physical scale model measurements. The scale model measurement techniques involved evaluation of impulse responses in a 1:12 scale model of Darussholah mosque, in East Java, Indonesia. A miniature human voice source was created to carry out the impulse response measurements. It was carefully evaluated to ensure that it produced adequate frequency response and directivity comparable to an actual human voice. Acoustical parameters were derived from the impulse responses. Statistical analysis using ANOVA and t-tests were used to compare results from the measurements with variations of domed ceiling configurations and other aspects of the measurement setting. Conclusions were based on these comparisons and on auralization listening tests in order to ascertain the elements that produced the most significant impact on the mosque acoustics. The analysis helps establish criteria for good acoustics in mosques and other buildings with domed ceilings.

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