Thesis (M.S.) -- Mississippi State University. Department of Computational Engineering. / Title from title screen. Includes bibliographical references.

Orientador: Pedro Jose Winterstein / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Educação Fisica / Made available in DSpace on 2018-08-10T07:27:14Z (GMT). No. of bitstreams: 1 Massarella_FabioLuiz_M.pdf: 601197 bytes, checksum: 1b1012b90208cfa0b1338fc7ac856874 (MD5) Previous issue date: 2008 / Resumo: A motivação intrínseca é caracterizada pelo comportamento comprometido consigo mesmo e com o prazer e satisfação derivados da participação, enquanto a motivação extrínseca ocorre se a tarefa é realizada na expectativa de recompensas externas. Quando um indivíduo está motivado intrinsecamente pode vivenciar um estado mental diferenciado, denominado estado de flow, uma teoria desenvolvida pelo psicólogo e pesquisador Mihalyi Csikszentmihalyi. Trata-se de um estado de atenção plena e envolvimento profundo, que resulta em experiências marcantes e de grande significado pessoal. As duas teorias, motivação intrínseca e estado de flow, constituíram o referencial teórico para analisar: quais os motivos subjacentes à escolha da prática de corrida de rua como modalidade esportiva; a tendência motivacional intrínseca ou extrínseca; a vivência de um estado mental diferenciado como o flow e a relação com o engajamento na corrida. Este estudo analisou as respostas de praticantes de corrida de rua a uma entrevista semi-estruturada. Os dados foram analisados pelo método de ¿análise de conteúdo¿, baseado em Bardin, por meio da qual foram levantadas categorias temáticas relativas aos sentimentos e pensamentos dos praticantes quando estão correndo e às experiências pessoais vivenciadas nessa prática. As categorias levantadas foram: incentivos favoráveis e desfavoráveis com relação à motivação para a atividade; sentimentos favoráveis e desfavoráveis; pensamentos favoráveis e desfavoráveis; experiências pessoais positivas e negativas. As análises revelaram que a maioria dos praticantes começou seu envolvimento com a corrida motivada extrinsecamente, mas a motivação intrínseca é determinante no engajamento deles por muitos anos. Todos os praticantes apresentaram predominantemente uma tendência motivacional intrínseca. Foram verificados alguns elementos que caracterizam a vivência de um estado mental similar ao estado de flow. Os elementos da teoria do flow podem ser considerados como importantes direcionadores na estruturação das atividades físicas, podendo levar o indivíduo a um envolvimento profundo, à concentração total na atividade que realiza e a grande satisfação. A vivência de estados mentais positivos como o flow mantém o indivíduo intrinsecamente motivado, o que pode significar maior assiduidade e tempo de permanência enquanto praticante / Abstract: The intrinsic motivation is characterized by the compromised behavior within and with the pleasure and satisfaction derived from participation. When an individual is intrinsically motivated, he can experience a different mental state, named flow state, a theory developed by psychologist and researcher Mihalyi Csikszentmihaly. It is a state of full attention and deep involvement, which results in marked experiences and great personal significance. The two theories, intrinsic motivation and flow state, provided the theoretical benchmark for reviewing: the underlying reasons for choosing the practice of running as sports mode; the trends intrinsic and extrinsic motivation, the experience of a different mental state such as flow, and the connection with the engagement in the running. This study examined the responses of the practitioners of street running to a semi-structured interview. The data were analyzed by the method of "content analysis", based in Bardin, by means of which were raised thematic categories, related to the feelings and thoughts of the practitioners when they are running and the personal experiences lived on this practice. The categories were raised as follow: favorable and unfavorable incentives with respect to the motivation for the activity; favorable and unfavorable feelings, favorable and unfavorable thoughts; positive and negative on their own experiences. The analysis revealed that most practitioners began their involvement with running motivated by outer reasons than the intrinsic motivation, but it¿s crucial in engaging them for many years. All practitioners have shown predominantly a tendency motivation intrinsic. There where verify some elements that characterize the experience of a mental state similar to the flow state. The elements of the flow theory can be considered as important conditions in structuring physical activities given that the individual could lead to a deeper involvement, the total concentration on activity that holds and the greatest satisfaction. The experience of positive mental states such as flow keeps the individual intrinsically motivated and could mean higher attendance and length of stay while practicing / Mestrado / Educação Fisica e Sociedade / Mestre em Educação Física

The diploma thesis deals with the design of nature close to the flood protection of the city Prostějov at the confluence of the watercourses Romže and Hloučely and the flow Valova (Romže). In canculations there was solved capacity of individual sections and canculation of levels for one-year, five-year and twenty-year flow. For canculations there was used one-dimensional mathematical model HEC-RAS 5.0.3. Determination of roughness of bottom and slopes was based on personal visit. The result of this diploma thesis is evaluation of current state and proposal of a nature close to the flood protection in the individual streams in the city Prostějov. The thesis contains the calculation part and the drawing part documenting the proposed measure.

No description available.

The focus of this thesis is to deal with reverse engineering of high-rise building settlements. This is modeled via the finite element method performed in the Plaxis 3D program. In the first part of this thesis, a calibration of input parameters of an appropriate material model – Hardening soil – is conducted. This calibration is a result of oedometric test data which were obtained within a geotechnical survey. An influence of soils over consolidation affecting calibration and the material model choice is described. Final values of reference stiffness parameters are used in a mathematical model of the focused area. This model is created for one half of the high-rise building plan, including vestibule. The high-rise building is founded in a foundation pit. The foundations of this building consist of raft foundation and piles of jet grouting. In the model, there are also changes in pore pressure during an excavation of foundation pit included. The functional model is used for parametric analyses, namely examining cases of object´s foundations and the possible influence of foundation pit´s symmetry on the object´s settlement. All the calculated processes in the object´s settlements are then compared to data obtained from geotechnical monitoring of the structure.

Cette thèse est consacrée au développement d'une méthode numérique visant à modéliser des écoulements dans des milieux poreux fissurés, ainsi qu'à déterminer leur perméabilité effective à partir des avancements théoriques récents. En parallèle, elle a été aussi l'occasion de continuer sur la voie théorique et d'obtenir de nouveaux résultats sur ce plan.Les équations générales gouvernant l'écoulement dans de tels matériaux sont rappelées, et plus particulièrement, la conservation de la masse à l'intersection entre fissures est établie explicitement [132, 139]. Des solutions générales du potentiel sont proposées sous la forme d'une équation intégrale singulière décrivant l'écoulement dans et autour des fissures entourées par une matrice infinie soumise à un champ lointain [136, 139]. Ces solutions représentent le champ de pression dans le milieu infini en fonction de l'infiltration dans les fissures qui prennent en compte complètement l'interaction et l'intersection entre fissures. En considérant le problème d'une fissure super-conductrice, des solutions analytiques de l'écoulement ont été développées et ces solutions sont utilisées comme cas de référence pour valider la solution numérique. De plus, la solution théorique de ce problème dans le cas 3D permet de comparer le modèle d'écoulement de Poiseuille dans une fissure elliptique d'épaisseur nulle et le modèle d'inclusion ellipsoïdale aplatie soumise à l'écoulement de Darcy [140]. Des outils numériques ont été développés en se basant sur la méthode des équations intégrales singulières afin de résoudre les équations générales du potentiel [132, 180]. Cela permet, d'une part, de modéliser l'écoulement stationnaire dans un domaine poreux contenant un grand nombre de fissures et, d'autre part, de proposer une solution semi-analytique de l'infiltration dans une fissure isolée dépendant de la perméabilité de la matrice, de la conductivité de la fissure et de la variable géométrique de la fissure. Cette dernière est l'élément essentiel pour déterminer de la perméabilité effective d'un milieu poreux fissuré en utilisant des schémas d'homogénéisation. Ce modèle auto-cohérent révèle un seuil de percolation qui est alors applicable pour l'estimation de la perméabilité effective d'un matériau contenant un grand nombre de fissures. L'approche par sous-structuration permet l'extension de la solution générale du potentiel, écrite pour un domaine infini, à celle d'un domaine fini [181]. Une solution analytique de l'écoulement dans et autour d'une fissure partiellement saturée est établie, fondée sur la solution analytique pour la fissure super-conductrice. Celle-ci est alors utilisée pour estimer la perméabilité effective d'un milieu poreux fissuré non-saturé [141]. Le modèle de la perméabilité effective est appliqué dans le contexte du stockage géologique du CO2 en vue d'étudier le comportement d'une zone de faille constituée par un noyau argileux et des zones fissurées. La pression d'injection provoque l'augmentation de la pression interstitielle dans le réservoir. Cette surpression engendrée dans le réservoir peut affecter la perméabilité de zones fissurées ce qui conduit à des phénomènes hydromécaniques couplés. Les résultats de simulations numériques permettent d'évaluer, d'une part, le risque de la remontée de la saumure à l'aquifère supérieur, et d'autre part, le risque de l'initiation d'une rupture sur le plan de la faille / This thesis aims to develop a method for numerical modelling of fluid flow through fractured porous media and for determination of their effective permeability by taking advantage of recent results based on formulation of the problem by Singular Integral Equations. In parallel, it was also an occasion to continue on the theoretical development and to obtain new results in this area. The governing equations for flow in such materials are reviewed first and mass conservation at the fracture intersections is expressed explicitly. Using the theory of potential, the general potential solutions are proposed in the form of a singular integral equation that describes the steady-state flow in and around several fractures embedded in an infinite porous matrix under a far-field pressure condition [136, 139]. These solutions represent the pressure field in the whole body as functions of the infiltration in the fractures, which fully take into account the fracture interaction and intersections. Closed-form solutions for the fundamental problem of fluid flow around a single fracture are derived, which are considered as the benchmark problems to validate the numerical solutions. In particular, the solution obtained for the case of an elliptical disc-shaped crack obeying to the Poiseuille's law has been compared to that obtained for ellipsoidal inclusions with Darcy's law [140].The numerical programs have been developed based on the singular integral equations method to resolve the general potential equations [132, 180]. These allow modeling the fluid flow through a porous medium containing a great number of fractures. Besides, this formulation of the problem also allows obtaining a semi-analytical infiltration solution over a single fracture depending on the matrice permeability, the fracture conductivity and the fracture geometry. This result is the important key to upscalling the effective permeability of a fractured porous medium by using different homogeneisation schemes. The results obtained by the self-consistent scheme have been in particular established. The multi-region approach can be used to extend the general potential solution written for the infinite domain to that for a finite domain [181]. A closed-form solution for flow in and around a single partially saturated fracture, surrounded by an infinite matrix subjected to a far-field condition, is also derived combining the solutions for a superconductive fracture and for an imprevious fracture. This solution is then employed to estimate the effective permeability of unsaturated fractured porous media [141].The effective permeability model is applied to study the hydromechanical behaviour of a fault zone constituted by a clay core surrounded by fractured zones in the context of CO2 geological storage. The pressure injection induces an overpressure in the reservoir that may affect the permeability of the fractured zones leading to complexe coupled hydromechanical phenomena. The simulation results allow evaluating the risk of leakage of the reservoir brine to higher aquifers as well as the risk of fault reactivation

This Master´s thesis deals with problematics related to the connection of new decentralized power sources into electrical power grid. Due to advantageous legislative support of these new, especially photovoltaic power sources, a massive amount of these sources have been connected into the power grid between years 2009 and 2010. For theoretical understanding of processes during a steady-state, the initial parts of this paper are focused on a procedure which solves steady-state on every power line mentioned. When we speak of decentralized power sources connection, it is necessary to mention the connected legislative. National distribution grid operators in collaboration with national regulatory commission have decided on a legislative document Rules of distribution grid operation, which puts a set of demands and requirements on applicants wishing to connect a new power source to the grid. The text of this thesis is focused mainly on demands required after the latest change in 1/2010. Practical part of this work deals with verification of new power source influence on a related power grid and meeting the legislatively required demands. The most important demands are voltage change due to new power source operation and its transfer to other voltage levels, higher harmonics injection, power output fluctuation and last, not least, changes in load flow directions. For reasons previously mentioned an analysis is made and possibilities of reducing or removing of these influences are introduced. To achieve these goals, two computer programs, Siemens Sinaut Spectrum and NetCalc are used.