Thesis (Ph. D.)--Ohio State University, 2008. / Title from first page of PDF file. Includes bibliographical references (p. 172-177).

Thesis (M.S.)--University of Wisconsin--Madison, 1966. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 79-81.

This dissertation uncovers and examines linguistic and functional patterns of student writing in the first two years of college. A corpus of student papers from six disciplines (philosophy, English, psychology, biology, chemistry, and physics) was collected, and multi-dimensional (MD) analysis (Biber, 1988) was used to examine the ways that discipline and paper type influence writing. Further explorations of the data compare lower-level student writing to upper-level student writing, professional academic biology writing, and the discipline-specific approximations of an English for Specific Purposes (ESP) course. Findings show that specificity of both linguistic and functional properties exist even at such low levels of disciplinary acculturation. These studies are followed by a summary and contextualization of their findings. Finally, future inquiry using collected data and future investigations into student literacy practices are proposed.

Les mini ou nanoémulsions sont des systèmes fréquemment rencontrés dans différents domaines : cosmétique, pharmaceutique, biomédical… Plusieurs procédés permettent la préparation de nanoémulsions. Cependant, ils présentent tous des limitations en termes de taille des gouttelettes, d’énergie de mélange, de rapport de viscosité entre les phases dispersées et continues, de gamme de pression à appliquer… Ce travail s’intéresse au développement d’un nouveau dispositif basé sur un écoulement élongationnel pour l’élaboration de miniémulsions de monomères. La démarche a consisté d’abord à étudier l’influence des paramètres liés au procédé proprement dit puis à la formulation du système sur la taille des gouttelettes. Cette étude a permis de comprendre les mécanismes mis en jeu lors de la fragmentation des gouttes. Une analyse dimensionnelle a ensuite été développée afin de corréler les tailles obtenues aux paramètres étudiés, par l’utilisation des nombres adimensionnels appropriés. Finalement, des expériences de synthèse en miniémulsion ont été conduites pour tenter de combiner dans le même dispositif les fonctions d’émulsificateur et de réacteur de polymérisation, dans une perspective d’intensification du procédé. / Mini or nanoemulsions are widely used in different fields like cosmetic, pharmaceutic and biomedical… Different processes allow the preparation of nanoemulsions. However, they all present limitations in terms of droplet size, mixing energy, viscosity ratios, pressure ranges… This work focused on the development of a new process based on elongational flow for theelaboration of miniemulsions. The approach consisted in studying the influence of the process and formulation parameters on droplet sizes. This study allowed us to better understand the mechanisms of drop breakup. Then, a dimensional analysis was carried out in order to correlate the obtained droplet sizes to the studied parameters by the use of the appropriate dimensionless numbers. Finally, miniemulsion synthesis experiments were performed in order to try to combine, in the samedevice, both emulsification and polymerization, in the prospect of process intensification.

Orientador: Osvaldo Luís Manzoli / Banca: Túlio Nogueira Bittencourt / Banca: Estevam Barbosa de Las Casas / Resumo: Este trabalho tem o propósito de contribuir para a generalização tridimensional de problemas de análise numérica da propagação de fissura, mediante a formulação de elementos finitos com descontinuidade incorporada. Em problemas planos as descontinuidades correspondem a linhas que podem ser elaboradas de uma forma relativamente simples, através da construção sequencial de segmentos retos, orientados conforme a direção de falha no interior de cada elemento finito do sólido. Na análise tridimensional a construção do caminho de descontinuidade é mais complexa, pois devem ser construídas superficiais planas no interior de cada elemento e essas superfícies planas devem ser contínuas entre os elementos. É apresentada, nesse trabalho, uma técnica alternativa de construção do caminho de descontinuidade em análises tridimensionais baseado na solução de um problema análogo ao problema de condução de calor, estabelecido a partir de orientações locais de falha, baseado no estado de tensão do problema mecânico. A solução do problema equivalente é obtida utilizando a mesma malha e interpolações do problema mecânico. Para minimizar o esforço computacional, é proposta uma estratégia na qual a análise para mapear o caminho da descontinuidade é restrita ao domínio formado por alguns elementos próximos à superfície de fissura, que se desenvolve ao longo do processo de carregamento. Para validar a metodologia proposta foram realizadas análises tridimensionais de problemas básicos de fratura experimentais e seus resultados foram contrastados com os resultados encontrados na bibliografia. Realizou-se também a comparação do tempo de processamento entre o algoritmo proposto e o algaritmo global para as mesmas análises mencionadas acima. Como resultado, constatou-se que o algoritmo proposto conseguiu descrever satisfatoriamente as trajetórias de descontinuidade, consumindo menor tempo de processamento / Abstract: This work contributes to the generalization to 3D problems of numerical analysis of crack propagation, through finite elements formulation with embedded discontinuity. In plane problems the discontinuities correspond to lines that can be tracked in a relatively simple way, by sequentially constructing straight segments, following the crack orientation inside each solid finite elements. In tree-dimensional analysis the tracking scheme is more complex since planar surfaces must be constructed inside each element and these planar surfaces must be continuous between elements. It is show in this work, an alternative version of discontinuity path construction technique in three-dimensional analysis based on the solution of an analogous heat conduction problem, established from the local failure orientation based on the stress state of the mechanical problem. The solution of the equivalent problem is obtained using the same mesh and interpolations of the mechanical problem. To minimize computational effort, a strategy is proposed in which the analysis to track the discontinuity path is restricted to the domain formed by few elements near the crack surface front, which develops along the loading process. To validate the poposed methodology three-dimensional analysis of experimental fracture test were performed and the results were contrasted with those obtained from the literature. The comparison between the process time of the proposed algorithm and the global algorithm was performed too. It was found that the proposed algorithm was able to describe the discontinuity path satisfactorily with reduced computational time / Mestre

Orientador: Antonio Jose da Silva Maciel / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Agricola / Made available in DSpace on 2018-08-06T18:35:35Z (GMT). No. of bitstreams: 1 Albiero_Daniel_M.pdf: 5056205 bytes, checksum: 94067cb876fadf926d673b4af8cc5f8c (MD5) Previous issue date: 2006 / Resumo: Este trabalho foi desenvolvido no campo experimental da Faculdade de Engenharia Agrícola da UNICAMP e teve como objetivo avaliar o novo sistema de preparo de solo Conservacionista em Faixas com "Paraplow" Rotativo, dando ênfase para a aplicação em sistemas de plantio voltados para agricultura familiar. A avaliação foi dividida em três grupos: caracterização da ferramenta como conservacionista; caracterização geométrica da faixa bem preparada; e determinação da configuração operacional ótima para a agricultura familiar. Foi utilizada a técnica de análise dimensional que através do planejamento experimental à ela atrelado define o elenco dos principais parâmetros a serem medidos e importantes para as respectivas determinações, caracterizações e comprovações. Com estes parâmetros definidos, em um total de vinte e dois parâmetros foram realizados o experimento em campo em um delineamento experimental totalmente aleatório, onde foi realizado o experimento com oito tratamentos, onde cada tratamento disposto em uma linha experimental com cinco pontos de coletas de dados antes, e cinco pontos de coleta de dados após a passagem da ferramenta. Para este arranjamento foram feitas duas repetições para cada parâmetro totalizando dezesseis linhas experimentais, perfazendo um total de dez pontos avaliados para cada tratamento. Com os dados coletados foi possível realizar as análises através da: estatística descritiva básica, análise dimensional e análise de variância. Os resultados obtidos demonstram claramente que o "Paraplow" Rotativo é uma ferramenta de preparo de solo conservacionista. As avaliações operacionais indicam que esta ferramenta acoplada a um motocultor de 12 cv é adequada a utilização pela agricultura familiar, tendo capacidades de campo compatíveis com as necessidades das pequenas propriedades. Comparações entre as metodologias da Análise Dimensional e a Análise de Variância de uma via simples, demonstram a superioridade da Análise Dimensional em estudos de dinâmica do solo e avaliações de máquinas de preparo de solo / Abstract: This work was developed in the experimental field of Agricultural Engineering CoI: of State University of Campinas, and it had as objective to evaluate the new system of tillage in strip conservationist with Rotary "Paraplow", it was given emphasis for application in seeding systems appropriate for small fanns. The evaluation was divide( three groups: characterization of tool as conservationist; geometric characterization of st determination of operation configuration for small fanns. It was used the dimensional analysis method for to define the experimental plannin, having been determined which parameters should be measured. These parameters, in a tota twenty two, they were arrangement in a experimental design completely random, where t were realized the experiment with eight treatments, each treatment was allocated in experimental strip, with five points of obtaining data, before and after the action of the tI for these arrangement were made two repetitions for each parameter, totalizing sixt experimental strips, with ten point of obtaining data for each treatment. With these data it ' possible to realize the analysis through: descriptive statistical; dimensional analysis; . variance analysis. The results demonstrate that the Rotary "Paraplow" is a tool of soil till conservationist. The evaluations show that this tool coupled with tiller with 12 cv appropriated for small fanns, it have been compatible field capacity with the needs of sn fanns. Comparisons between the methodologies of dimensional analysis and the varia: analysis of one way, showed the superiority of the dimensional analysis in studies of ~ dynamics and evaluations of soil tillage machines / Mestrado / Maquinas Agricolas / Mestre em Engenharia Agrícola

Sistemas de irrigação geralmente são dimensionados negligenciando-se os cálculos das perdas localizadas de carga, o que muitas vezes causa desbalanço hidráulico deste sistema. A irrigação localizada possui muitas peças especiais para as quais, muitas vezes, não existem equações matemáticas que possibilitem o cálculo destas perdas. Este trabalho teve como objetivo o ajuste de equações que permitam o cálculo da perda localizada de carga para a passagem direta e outra para a passagem lateral, causada pela presença de conectores iniciais de linha. A perda de carga na passagem direta é causada pela área da protrusão do conector internamente à tubulação e a perda de carga na passagem lateral é causada pela mudança no perfil de escoamento da água ao passar pelo conector. Para as duas situações a perda localizada no conector foi obtida por diferença entre a perda distribuída de carga no tubo mais conector e a perda distribuída de carga no tubo sem conector. Foram utilizados 5 conectores em 5 diâmetros de tubulação de polietileno e 3 diâmetros de tubulação de PVC. Foi utilizada análise dimensional para o desenvolvimento das equações que para a passagem direta apresentou um coeficiente de determinação de 97,27% e para a passagem lateral o coeficiente de determinação foi de 96,26%. As duas equações desenvolvidas apresentaram um coeficiente ótimo de desempenho, sendo seu uso indicado para os limites testados neste trabalho. / Irrigation systems are generally dimensioned neglecting the calculation of the local head loss which often causes a hydraulic disbalance of this system. There are many special components on a trickle irrigation system to which there are not mathematical equations that allow the calculation of these head losses. This study aimed the adjustment of one equation for calculating the local head losses to the direct passage and one for the lateral passage, caused by the presence of initial connectors on the lateral line. The local head loss on the direct passage is caused by the protrusion area of the connector inside the pipe and the local head loss on the lateral passage is caused by the change in the flow cross-section, when water passes through the connector. For both situations the local head loss on the connector was obtained by the difference between the local head loss on the pipe plus the connectors and the local head loss on the pipe without the connectors. There were used 5 connectors in 5 diameters polyethylene pipes and 3 diameters PVC pipes. Dimensional analysis was used to develop the equations that for the direct passage presented a determination coefficient of 97,27% and for the lateral passage the determination coefficient was 96,26%. The two equations developed showed a good coefficient of performance, and its use is indicated for the limits tested in this study.

The Master's thesis deals with the proposition of a suitable methodology to produce test specimens intended for tensile testing. Considering the irregular geometries of the parts and deformations in previous tests, reverse engineering was used to obtain a CAD model that was used to control dimensions and create a machining strategy. This thesis also includes an analysis of current technologies in the field of reverse engineering.

No description available.

In the past couple of decades, the amount of data available has dramatically in- creased. Thus, in modern large-scale inference problems, the dimension of the signal to be estimated is comparable or even larger than the number of available observa- tions. Yet the desired properties of the signal typically lie in some low-dimensional structure, such as sparsity, low-rankness, finite alphabet, etc. Recently, non-smooth regularized convex optimization has risen as a powerful tool for the recovery of such structured signals from noisy linear measurements in an assortment of applications in signal processing, wireless communications, machine learning, computer vision, etc. With the advent of Compressed Sensing (CS), there has been a huge number of theoretical results that consider the estimation performance of non-smooth convex optimization in such a high-dimensional setting. In this thesis, we focus on precisely analyzing the high dimensional error perfor- mance of such regularized convex optimization problems under the presence of im- pairments (such as uncertainties) in the measurement matrix, which has independent Gaussian entries. The precise nature of our analysis allows performance compari- son between different types of these estimators and enables us to optimally tune the involved hyper-parameters. In particular, we study the performance of some of the most popular cases in linear inverse problems, such as the LASSO, Elastic Net, Least Squares (LS), Regularized Least Squares (RLS) and their box-constrained variants. In each context, we define appropriate performance measures, and we sharply an- alyze them in the High-Dimensional Statistical Regime. We use our results for a concrete application of designing efficient decoders for modern massive multi-input multi-output (MIMO) wireless communication systems and optimally allocate their power. The framework used for the analysis is based on Gaussian process methods, in particular, on a recently developed strong and tight version of the classical Gor- don Comparison Inequality which is called the Convex Gaussian Min-max Theorem (CGMT). We use some results from Random Matrix Theory (RMT) in our analysis as well.