Proefschrift Maastricht. / Lit. opg. - Met samenvatting in het Nederlands.

Proefschrift Universiteit Maastricht. / Auteursnaam op omslag: Lico Hoekema. Met bibliogr., lit. opg. - Met samenvatting in het Nederlands.

Thesis (MA)--University of Stellenbosch, 2008. / Bibliography. Also available via the Internet.

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Made available in DSpace on 2018-08-01T22:29:31Z (GMT). No. of bitstreams: 1 tese_4549_Dissertação Paulo Maciel.pdf: 6344610 bytes, checksum: fd8f862339be640c5a3eeb2c82490c57 (MD5) Previous issue date: 2010-03-22 / Este estudo exploratório mostra resultados sobre a investigação da utilização do "V" Epistemológico de Gowin em uma disciplina de Física Experimental na graduação em Física da Universidade Federal do Espírito Santo. Para o desenvolvimento desse estudo foi estruturada a implantação do "V" de Gowin na disciplina Física Experimental I para as modalidades Educador/Licenciatura e Pesquisador/Bacharelado do Currículo Novo do Curso de Física da UFES. Foi utilizado um roteiro sobre o uso do "V"de Gowin em Física Experimental e os roteiros das experiências realizadas na disciplina. Os estudantes produziram um "V" de Gowin para cada experimento, com o objetivo de explicitar a estrutura do experimento, ou seja, quais são as Questões Básicas de Pesquisa referentes aos objetivos da experiência; em que consiste o Domínio Conceitual, ou seja, os Princípios & Leis, as Hipóteses e os Conceitos envolvidos na experiência; quais são os Eventos realizados para as promover observações e coletas de dados do experimento; qual é o Domínio Metodológico utilizado, isto é, quais são os Registros dos Eventos, as Transformações necessárias, os Resultados dessas Transformações e as Interpretações possíveis a partir desses Resultados; quais são as Respostas as Questões Básicas de Pesquisa proposta e; qual a relevância dessas Respostas e de todo o experimento estudado. Para analisar os "V"s de Gowin produzidos utilizaram-se critérios de avaliação baseados em par^ametros que valorizam a articulac~ao dos aspectos do "V". Com a conclus~ao do estudo, foi possvel analisar as habilidades e di-culdades apresentadas pelos estudantes com a implantac~ao do\V"de Gowin em Fsica Experimental. Tambem foi possvel indicar contribuic~oes para os roteiros entregues aos estudantes na disciplina Fsica Experimental. E -nalmente, foi realizada uma analise sobre os criterios de avaliac~ao utilizados nesse estudo.

Velocity-difference induced focusing (V-DIF) with a dynamic pH junction in capillary electrophoresis (CE) using a sample with a pH different from that of the background electrolyte (BGE) was developed in our group, but the mechanism was not well understood. In this work, the mechanism of this focusing technique was first studied using an appropriate dye to monitor the pH of the BGE and the sample during the focusing process. A mechanism was proposed based on the experimental results. This technique was then applied to serotonin to improve the detection limit when CE was used with a UV absorption detector. It was also applied to focus amino acids, peptides, and proteins to improve the concentration sensitivity. It is found that the pKa rather than the pI of the analytes is the key criterion for selecting the pH for the sample and for the BGE to obtain the optimum focusing for these molecules. Since UV detection only provides migration time information, more structure information is obtained by using a photodiode array (PDA) and mass spectrometer (MS) for peak identification. Comparisons were made between the PDA detection and MS detection for aromatic amino acids with V-DIF using a dynamic pH junction. This V-DIF technique was then applied to non-aromatic amino acids with MS detection. It was used at low pH with positive ESI-MS detection and at high pH with negative ESI-MS ionization. The results of the two methods were compared and discussed. Finally, the preparative operation of continuous flow counterbalanced CE (FCCE) was studied. The effects of larger sample volumes and multiple capillary systems on improving the purification yield were investigated. / Science, Faculty of / Chemistry, Department of / Graduate

This paper develops a stochastic model for the growth of two interacting populations: when one species preys upon the other. The spatial distribution of the populations is considered, that of the prey being assumed to be clustered and quasi-uniform. This latter distribution is discussed in some detail, and it is found that, although it has been suggested that clustering of the prey may be a protective device against predators, any differences in the stochastic models for clustered and unclustered populations lie only in the constant coefficients involved in the formulation of the model. The approach used in developing the proposed model is that of Chiang. The size of the prey and predator populations; are assumed to be random variables X(t) and Y(t) respectively, and certain assumptions are made concerning the birth-rate and death-rate In either population. These assumptions are based on the deterministic equations (formula omitted). These equations are modifications of equations published by Leslie in 1958. Differential equations are developed for the rate of change of the probability that X(t)=x and Y(t)=y, by giving transition probabilities in some small interval of time and letting the interval shrink to a point. Hence differential equations, for the rate of change of the joint probability generating function of X and Y, and for the rate of change of the joint factorial moments of X and Y are obtained. Because of the complicated nature of these equations, however, no attempt is made to solve them. / Science, Faculty of / Mathematics, Department of / Graduate

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Boston University. University Professors Program Senior theses. / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / 2999-01-01

Master's Thesis "Restructuring of Technistone, a.s. company" is pursuits two main aims: to analyze Technistone's initial financial situation including identification of its causes and to propose the remedy solution. As a primary method for analyzing data are used standard methods of financial analysis. The remedy solution is based on the combination of the results of the financial analysis and used in practice concept of change management above crisis conditions -- "V Concept". Thesis conclusion lies in discovering of insolvency of Technistone, a.s. company. The proposed solution mainly consists in the debt reorganization.