We report herewith the preparation of SnO₂ nanotubes with very good shape and size control, and with and without a carbon nanotube overlayer, The SnO₂-core/carbon-shell nanotubes are excellent reversible Li ion storage compounds combining the best features of carbon (cyclability) and SnO₂ (capacity) to deliver a high specific capacity (~540-600 mAh/g) simultaneous with good cyclability (0.0375% capacity loss per cycle). / Singapore-MIT Alliance (SMA)

"The purpose of this dissertation is ... to review the economic geology of primary tin deposits and the geological factors that control grade and tonnage . The work concludes with a discussian of the implications of these geological controls on evaluation"-- Introd., p. 1

Nuclear magnetic resonance studies in single crystals of aluminum and tin have been done at liquid helium temperatures. The Knight shift in tin has been studied as a function of crystal orientation in a constant magnetic field for different values of field and temperature. The anisotropic Knight shift in tin was observed directly for the first time. The line width of the tin resonance was also studied and found to depend on the crystal orientation in the magnetic field. The second moment of the line has been calculated in terms of dipole-dipole interactions and indirect exchange interactions between nuclei of different magnetic moments and compared with the experimental results. The Knight shift was studied as a function of external field for both tin and aluminum in a search for de Haas-van Alphen type oscillations. No indication of these was found. An upper limit for this effect was determined for each sample. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

The thesis presents an analysis of the influence of the international tin agreements (ITA) on the world tin industry between 1956 to 1985. The ITAs, the first of which came into effect in 1956, were jointly operated by tin producing and consuming countries. The International Tin Council (ITC) used a buffer stock and export controls to maintain the price of tin within a band. This experiment in stabilizing tin prices ended in October 1985, when the ITC was unable to continue its operations because it ran out of financial resources. The study first analyzes the market structure of the world tin industry in some detail. Then an econometric model which attempts to capture the behaviour of supply, demand and price of tin over the 30 year period is constructed. Particular attention was paid to the estimation of the tin production functions for major tin producing countries. In many of these countries, the output of the tin depended not only on the price of tin but also on the policies of the ITC as well as the internal political environment of the country. The model is then used to simulate a scenario in which the ITC does not intervene in the tin market. The differences in the price and revenue levels between the actual and simulated scenario are computed. The simulation results show that the tin agreements succeeded in their objective of reducing the variability of price and producers' revenue. In addition, the average level of price and revenues under the ITC regime was higher than under the non-intervention scenario. In evaluating policy options, it was shown that the establishment of a cartel is not viable in the long term for both economic and political reasons. The recommended policy options include improving access to futures markets, providing better transparency of tin market operations, the establishment of government policies which provide better incentives for tin mining and tin using industries in the major tin producing countries and continued efforts in research and development with the aim of lowering costs of production and increasing the uses for tin. / Business, Sauder School of / Graduate

This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).

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Thesis (M. Sc.)--University of Hong Kong, 1992.

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published_or_final_version / Chemistry / Master / Master of Philosophy