Thesis (Ph. D.)--University of Washington, 2007. / Vita. Includes bibliographical references (leaves 126-138).

Thesis (Ph.D.)--University of Alabama at Birmingham, 2009. / Title from first page of PDF file (viewed on June 10, 2009). Includes bibliographical references.

Thesis (Ph. D.)--University of Washington, 2004. / Vita. Includes bibliographical references (leaves 91-102).

Thesis (Ph. D.)--University of Washington, 1996. / Vita. Includes bibliographical references (leaves [145]-174).

Vertical up-flow of supercritical fluid in the subchannel of a heated rod bundle was numerically simulated using the Computational Fluid Dynamics (CFD) codes ANSYS CFX and ANSYS FLUENT. A total of seven cases from three different sets of experiments were simulated. Three-dimensional steady-state predictions of fluid velocity, pressure, and temperature were made using five versions of two-equation RANS turbulence models with accompanying wall treatments. In addition, the temperature distribution in a solid region comprising a heater and sheathing was also computed in some cases. The k-epsilon turbulence model, implemented using CFX and scalable wall functions, provided the numerical results that have the smallest overall deviation from experimental results for three of the seven cases, and predicts the experimental data of the remaining four cases reasonably well, unlike other turbulence models that severely over-predict the experimental data for wall surface temperature. / February 2016

Made available in DSpace on 2014-12-17T14:08:44Z (GMT). No. of bitstreams: 1 FilipeCAL_DISSERT.pdf: 1482396 bytes, checksum: ac4b807c36f7a7406c75156b433df756 (MD5) Previous issue date: 2010-05-07 / This work aims presenting the development of a model and computer simulation of a sucker rod pumping system. This system take into account the well geometry, the flow through the tubing, the dynamic behavior of the rod string and the use of a induction motor model. The rod string were modeled using concentrated parameters, allowing the use of ordinary differential equations systems to simulate it s behavior / Este trabalho visa apresentar a modelagem e a simula??o computacional de um sistema de eleva??o de petr?leo por bombeio mec?nico. Tal sistema leva em considera??o a geometria do po?o, o escoamento do fluido na coluna de produ??o, o comportamento din?mico da coluna de hastes e o uso de um modelo para o motor de indu??o. A coluna de hastes foi modelada de forma a utilizar par?metros concentrados, permitindo o uso de sistemas de equa??es diferenciais ordin?rias na simula??o do comportamento da mesma

O presente trabalho visa entender as relações entre as propriedades mecânicas e a composição química de fio-máquinas produzidos com aços SAE 1005 e SAE 1405 modificados e os parâmetros de controle de um laminador a fim de se obter, após a laminação a quente, as propriedades mecânicas semelhantes para os dois tipos de aço. A metodologia adotada envolveu as etapas de revisão da literatura e procedimento experimental D.O.E (Design of Experiments), com coleta de amostras de fio-máquina 5,50 mm produzido com o aço SAE 1005 modificado e outras de fio-máquina 5,50 mm produzido com o aço SAE 1405 modificado, nas condições normais de operação para avaliação das propriedades mecânicas através de ensaios de tração e análise metalográfica. Esse resultado visa criar uma alternativa para a fabricação de arames recozidos com o uso do fio-máquina produzido com o aço SAE 1005 modificado, com um menor custo do produto final. / The present work aims to understand the relationships between the mechanical properties and chemical composition of wire rod produced with SAE 1005 and SAE 1405 modified steels and the parameters of a rolling mill in order to obtain, after hot rolling, mechanical properties similar for both types of steel. The methodology involved the steps of literature review and experimental procedure DOE (Design of Experiments), with sampling of 5.50 mm wire rod produced with the SAE 1005 modified and other samples of 5.50 mm wire rod made from steel SAE 1405 modified under normal conditions of operation for evaluation of mechanical properties through tensile testing and metallographic analysis. This result created an alternative for the fabrication of annealed wire using the wire rod produced with the SAE 1005 modified, with a lower total cost of the final product.

La rétine contient une horloge endogène régulant différentes fonctions rythmiques et participe à la synchronisation de l'horloge centrale du SCN au temps géophysique. Cette synchronisation met en jeu les bâtonnets, les cônes et les cellules à melanopsine. Contrairement au SCN, le rôle des photorécepteurs dans la réponse à la lumière de l'horloge rétinienne est controversé. Nos travaux et ceux d'autres équipes soutiennent un rôle de la melanopsine alors que 2 études récentes suggèrent que seule la neuropsine est impliquée. Mon projet vise à disséquer le rôle des différents photorécepteurs par des approches in vitro/ex vivo chez des souris sauvages, Per2Luc et/ou déficientes en photorécepteurs. Des lumières monochromatiques ciblant différents photorécepteurs ont été appliquées à des explants rétiniens en culture de souris Per2Luc ou déficientes en melanopsine, cônes MW ou bâtonnets. Nos résultats montrent un rôle des bâtonnets dans le décalage de phase de l'horloge rétinienne par la lumière dans le spectre visible et une contribution additionnelle des cônes SW et/ou de la neuropsine dans l'UV. L'horloge rétinienne étant composée de plusieurs horloges et afin de déterminer leur réponse à la lumière, l'induction photique des gènes Per1-Per2 et C-Fos a été analysée dans les couches rétiniennes isolées chez des souris sauvages et déficientes en photorécepteurs. Chez les souris sans melanopsine ou cônes MW, l'induction de Per1-Per2 est abolie dans toutes les couches, suggérant un rôle de ces photorécepteurs. En résumé, nos résultats indiquent un rôle différentiel des photorécepteurs en fonction de la réponse mesurée (décalage de phase de PER2::Luc et induction des gènes de l'horloge par la lumière) / The mammalian retina contains an endogenous pacemaker regulating retinal physiology and participate to the sybchronization of the temporal phase of the central clock of the SCN to environmental time. This entrainment process involves rods, cones and melanopsin-containing retinal ganglion cells. In contrast with the SCN, the role of these photoreceptors in the light response of the retinal clock is still controversial. While recent studies suggest that none of them is involved in light response of the retinal clock, others support a role for melanopsin. My project aims to dissect the role of these different photoreceptors in wild-type, Per2Luc and/or photoreceptor-deficient mice using in vitro/ex vivo approaches. Monochromatic lights targeting different photoreceptors were applied to retinal explants of Per2Luc or melanopsin-, MW cones- or rods-deficient mice. Our results demonstrate that rods are required for the light-induced phase shift of the retinal clock in the visible spectrum and suggest an additional contribution of SW cones and/or neuropsin in the UV. As the retinal clock is composed of several clocks and in order to determine their response to light, the photic induction of Per1-Per2 and C-Fos genes was analyzed in isolated retinal layers from wild-type and photoreceptor-deficient mice. In mice without melanopsin or MW cones, Per1-Per2 induction by light is abolished in all layers, suggesting a role for these photoreceptors. In summary, our results propose a differential contribution of the retinal photoreceptors as a function of the response recorded (phase shift of PER2::Luc or induction of clock genes by light)

The aim of this diploma thesis was exploration, interpretation and proposing of the preventive care of photographic fund from the state castle Grabštejn. The theoretical part is generally dedicated to the funds and collections administered by the National Heritage Institute, their destiny after the 2nd World War and the historical context which caused movements of these funds. A separate chapter is also devoted to the methods of exploration of the funds and collections. The second part of this thesis focuses on the history of the Grabštejn castle and its last owners - the Clam-Gallas family, with whom the preserved photographs are associated, and on the transport of the funds in the postwar period. The thesis follows the main journey of the photographic fund and related archival materials from the Grabštejn state castle to the collecting sites, museums and archives. Therefore the survey also took place in the National Museum Archives, the National Archives, the Institute of Art History of the Czech Academy of Sciences and the State Regional Archives in Litoměřice. The fundamental part of the survey was carried out in the castle Grabštejn. There were also studied the specific climate conditions for the photographs, which differ in the castle from the classical museum and archival depositories. Measuring of humidity and temperature was evaluated at the end of the thesis and recommendations for the preventive care were suggested.

A principal característica de cabos é a sua capacidadede suportar grande carga na direção longitudinal e são utilizadas em, por exemplo, concreto comprimido, plataformas e pontes. Usualmente, sua estrutura básica é formada por um elemento central (núcleo) e reto juntamente com outros componentes dispostos ao seu redor em forma de hélice. Existe uma variedade de geometrias que podem ser utilizadas, assim como número de camadas. Seguindo a teoria de vigas espaciais e parametrizando a geometria, a linha média de apenas uma dessas hélices foi analisada analiticamente. Essa simplificação é valida visto que o contato e deslizamento não são incluídos nesta teoria, produzindo uma primeira abordagem ao problema da modelagem dessas estruturas. Sendo assim, as equações de equilíbrio foram deduzidas e seu sistema diferencial foi resolvido com o objetivo de representar o comportamento mecânico da estrutura. Utilizando a tríade de Frenet-Serret para definir um sistema de coordenadas local, as condições de contorno foram aplicadas buscando determinar as constantes de integração resultantes da solução analítica das equações diferenciais. Essa solução foi comparadas com resultados numéricos obtidos pelo Método dos Elementos Finitos (FEM) para validação dos casos de carga concentrada e distribuída em duas geometrias, o arco plano e a hélice. Em ambos os casos resultados apresentaram boa concordância para forças, momentos, rotações e deslocamentos. Considerando o caso do arco, o seu raio foi aumentado, de forma que a geometria se aproximasse de uma viga reta. O modelo proposto também foi utilizado para simular uma mola sob compressão. / A high number of structures uses cables due to their ability to bear large load in the longitudinal direction, for example, prestressed concrete, offshore systems and bridges. Its basic structure is formed by a central straight element surrounded by strands laid helically. A variety of geometries can be used, as well as the number of layers. Using the theory of spatial beams and parameterizing the geometry, the center line of only one of these helixes was analyzed analytically, since contact and slip are not included in this theory, obtaining a first approach in order to model these structures and to determine its mechanical behavior. Thus, the equilibrium equations were deduced and the differential system was solved with the objective of representing the mechanical behavior of the structure. Using the Frenet-Serret triad to define a local coordinate system, the boundary conditions were applied aiming the determination of the integration constants. The expressions obtained were compared with results obtained by the Finite Element Method (FEM) for validation applying concentrated and distributed loads. All cases presented good agreement FOR forces, moments, rotations and displacements. Considering the arc case, its radius was increased until a straight beam. The proposed model was also used to simulate a spring under compression.