M.A. Dahleh, D.M. Richards. / Cover title. / Includes bibliographical references (p. 21). / Supported by the National Science Foundation. NSF 8810178-ECS Supported by the U.S. Army Research Office (Center for Intelligent Control Systems) DAAL03-86-K-0171

This thesis addresses a number of important problems which fall within the framework of the new discipline of Computational Geometry. The list of topics covered includes sorting and selection, convex hull algorithms, the L₁ hull, determination of the minimum encasing rectangle of a set of points, the Euclidean and L₁ diameter of a set of points, the metric traveling salesman problem, and finding the superrange of starshaped and monotone polygons. The main theme of all our work has been to develop a set of very fast state-of-the-art algorithms which supercede any rivals in terms of speed and ease of implementation. In some cases we have refined existing algorithms; for others we have ·developed new techniques which add to the present database of fast adaptive geometric algorithms. What emerges is a collection of techniques that is successful at merging modern tools developed in analysis of algorithms with those of classical geometry. / Ph. D.

A detailed study of a MOS-Bipolar power semiconductor known as the IGT or COMFET or GEMFET was undertaken. The major disadvantage of the device was identified as latching and the effect of various factors affecting latching were determined. The experiments performed determined susceptibility to latch under various conditions of temperature, rate of rise of gate-source voltage and rate of fall of drain-source voltage. A 340V, lOA three phase GEMFET bridge inverter using a pulse width modulation scheme to drive a permanent magnet brushless dc motor was successfully fabricated. The simplicity of the gate drive circuit and the low cost of the device make the IGT ideal for motor drive applications. / M.S.

Effect of irradiance on both initial and total ribulose bisphosphate carboxylase (RuBP Case) activities was investigated in soybean (Glycine max cv. Will) leaves. Initial RuBP Case activity (IA), present in a leaf extract prepared at 0°C and assayed without prior activation, was used as an estimate of in vivo activity. Total activity (TA) was measured in leaf extracts after full activation in high levels of CO₂ and Mg²⁺. Observed large variations in RuBP Case IA and TA in preliminary study, which prompted the necessity for optimizing conditions for extracting and assaying the enzyme in soybean. In a series of experiments optimal assay pH, Ru3P levels, Mg⁺ levels, and CO₂ levels were determined. Stability of RuBP Case in leaves and extracts was also investigated; observed storage of leaf tissue or extract at 0°C maintained stability of RuBP Case activation state for hours. Modified assay procedure was used to measure Ru3P Case IA and TA in leaves of soybean plants grown in 4 different irradiances: 20%, 53%, 70% and 100% full sun (FS). TA expressed on a leaf area basis was significantly reduced with lower irradiance, the result of a reduction in leaf volume. Percent activation (%act, IA/TA) was similar for the higher irradiance treatments (approx. 94%), but lower (74%) in leaves of the 20% FS grown-plants. However, percent activation in the 20% and 100% FS grown-plants was similar when leaves were exposed briefly to similar light conditions. Concluded %act to be dependent on leaf irradiance level at the time of leaf removal and extraction and not influenced by irradiance level during growth. Diurnal response of RuBP Case IA and TA also investigated in soybean plants growing in field, greenhouse and growth chamber. In all 3 environments, both IA and TA increased with increasing irradiance. Diurnal changes in TA were not due to changes in level of Fraction 1 protein (RuBP Case). Concluded light may also have a role in increasing TA as well as IA of RuBP Case. / Master of Science

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Orientador: Luiz Gonzaga Belluzzo / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Economia / Made available in DSpace on 2018-07-19T17:49:16Z (GMT). No. of bitstreams: 1 Almeida_JulioSergioGomesde_D.pdf: 7509767 bytes, checksum: 055eadb31acbb071bef43f19a1a8f4a0 (MD5) Previous issue date: 1994 / Resumo: Não informado / Abstract: Not informed. / Doutorado / Doutor em Economia

Orientador: Paulo R. Davidoff C. Cruz / Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Economia / Made available in DSpace on 2018-07-23T05:49:14Z (GMT). No. of bitstreams: 1 Macarini_JosePedro_D.pdf: 10367277 bytes, checksum: 7880e7d499e4970bc4f6f1360abe8f50 (MD5) Previous issue date: 1997 / Resumo: Não informado / Abstract: Not informed. / Doutorado / Doutor em Ciências Econômicas

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