19 resultados para Equações de diferença


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Gilles Deleuze hás commented on many philosophers, but his relationship with Nietzsche plays a singular role in his thought: appropriating the concept of the “eternal return” to think the central axis of his thesis, Difference and repetition (1968). Terms “difference” and “repetition” appeared associated to eternal return in his Nietzsche and philosophy (1962). Our dissertation thesis analyzes the presentations of that concept in bothworks. Chapter one presents the style construction and critical, methodological aspects of Nietzschean philosophy, fundamental elements to understand Deleuze’s interpretation. It subsequently analyzes the first presentation of that concept, expressed in the following terms: the aesthetic existence, either innocent or justified from the figure of game. We will see how the image of game implies another concept of chance, that leads Deleuze to think of an affirmative philosophical “type”, capable of creating new values. Chapter two evaluates the existential, “ethical-selective”, “physicalcosmological” character of the concept of eternal return, as much as the difficulties it imposes upon Nietzsche’s interpreter. We present afterwards Deleuzian comprehension of eternal return as a “parody” or a “simulacrum of doctrine”. Chapter three analyzes that interpretive position as a transvaluation of values from a rearrange of perspectives in order to overcome the negative comprehensions of existence. We want to question the way Deleuze builds another image of thought from the concept of eternal return – an image that, by a sort of “colagem” and selective elimination of the negativity, proposes a historiographic work and unfolds a lineage of thinkers of immanence and difference, a detour from the thought of identity, the same and the similar. We want thus to understand Deleuze’s critique of “dogmatic image of thought”.

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Gilles Deleuze hás commented on many philosophers, but his relationship with Nietzsche plays a singular role in his thought: appropriating the concept of the “eternal return” to think the central axis of his thesis, Difference and repetition (1968). Terms “difference” and “repetition” appeared associated to eternal return in his Nietzsche and philosophy (1962). Our dissertation thesis analyzes the presentations of that concept in bothworks. Chapter one presents the style construction and critical, methodological aspects of Nietzschean philosophy, fundamental elements to understand Deleuze’s interpretation. It subsequently analyzes the first presentation of that concept, expressed in the following terms: the aesthetic existence, either innocent or justified from the figure of game. We will see how the image of game implies another concept of chance, that leads Deleuze to think of an affirmative philosophical “type”, capable of creating new values. Chapter two evaluates the existential, “ethical-selective”, “physicalcosmological” character of the concept of eternal return, as much as the difficulties it imposes upon Nietzsche’s interpreter. We present afterwards Deleuzian comprehension of eternal return as a “parody” or a “simulacrum of doctrine”. Chapter three analyzes that interpretive position as a transvaluation of values from a rearrange of perspectives in order to overcome the negative comprehensions of existence. We want to question the way Deleuze builds another image of thought from the concept of eternal return – an image that, by a sort of “colagem” and selective elimination of the negativity, proposes a historiographic work and unfolds a lineage of thinkers of immanence and difference, a detour from the thought of identity, the same and the similar. We want thus to understand Deleuze’s critique of “dogmatic image of thought”.

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The present study provides a methodology that gives a predictive character the computer simulations based on detailed models of the geometry of a porous medium. We using the software FLUENT to investigate the flow of a viscous Newtonian fluid through a random fractal medium which simplifies a two-dimensional disordered porous medium representing a petroleum reservoir. This fractal model is formed by obstacles of various sizes, whose size distribution function follows a power law where exponent is defined as the fractal dimension of fractionation Dff of the model characterizing the process of fragmentation these obstacles. They are randomly disposed in a rectangular channel. The modeling process incorporates modern concepts, scaling laws, to analyze the influence of heterogeneity found in the fields of the porosity and of the permeability in such a way as to characterize the medium in terms of their fractal properties. This procedure allows numerically analyze the measurements of permeability k and the drag coefficient Cd proposed relationships, like power law, for these properties on various modeling schemes. The purpose of this research is to study the variability provided by these heterogeneities where the velocity field and other details of viscous fluid dynamics are obtained by solving numerically the continuity and Navier-Stokes equations at pore level and observe how the fractal dimension of fractionation of the model can affect their hydrodynamic properties. This study were considered two classes of models, models with constant porosity, MPC, and models with varying porosity, MPV. The results have allowed us to find numerical relationship between the permeability, drag coefficient and the fractal dimension of fractionation of the medium. Based on these numerical results we have proposed scaling relations and algebraic expressions involving the relevant parameters of the phenomenon. In this study analytical equations were determined for Dff depending on the geometrical parameters of the models. We also found a relation between the permeability and the drag coefficient which is inversely proportional to one another. As for the difference in behavior it is most striking in the classes of models MPV. That is, the fact that the porosity vary in these models is an additional factor that plays a significant role in flow analysis. Finally, the results proved satisfactory and consistent, which demonstrates the effectiveness of the referred methodology for all applications analyzed in this study.

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A legislação ambiental e os principais agentes que se relacionam com a empresa se constituem em fatores exógenos que não podem ser negligenciados ao formular-se e avaliar-se a política ambiental corporativa. As influências exógenas e seus efeitos sobre a gestão ambiental e o gerenciamento de projetos de exploração e produção (E&P) e, por essa via, sobre o desempenho ambiental, foram objetos de estudo desta tese. Embora o desempenho ambiental seja um assunto relevante, a pesquisa sobre esse tema ainda é escassa. Tal carência desponta ainda mais acentuada quando se aborda o desempenho ambiental de projetos na indústria de petróleo e gás. O principal objetivo deste estudo foi avaliar a relação entre a legislação ambiental vigente, as ações de órgãos reguladores, fornecedores, empresas terceirizadas e comunidades locais e o desempenho ambiental dos projetos de E&P na indústria de petróleo e gás e, também, analisar os efeitos do sistema de gestão ambiental e o gerenciamento dos projetos sobre tal desempenho. Na fase abdutiva, foi conduzido um estudo de caso com abordagem qualitativa em uma grande empresa brasileira do setor de petróleo e gás, na fase dedutiva, foi realizada uma pesquisa survey explanatória de corte transversal com abordagem quantitativa, incluindo 113 projetos de E&P de cinco unidades executoras da empresa. Foi formulado um modelo conceitual, com cinco construtos e sete hipóteses de pesquisa, representativo dos efeitos de fatores externos sobre o desempenho ambiental dos projetos de E&P. Os dados foram tratados aplicando a Análise Fatorial Exploratória e a Modelagem de Equações Estruturais com aplicação dos softwares IBM® SPSS® Statistics 20.0 e IBM® SPSS® Amos 18.0. O modelo de equações estruturais foi reespecificado e estimado utilizando o método de Máxima Verossimilhança e o procedimento bootstrap com 2000 reamostragens, até alcançar adequados valores dos índices de ajustamento. O modelo mostrou boa aderência às evidências empíricas, representando uma teoria explicativa dos fatores que influenciam o desempenho ambiental dos projetos de E&P na empresa estudada. As estatísticas descritivas apontaram adequado desempenho dos projetos de E&P com relação aos efluentes descartados, volume de água reutilizada, redução de resíduos e práticas de reciclagem. Identificou-se que projetos de maior porte alcançam melhor desempenho ambiental em relação aos de menor tamanho. Não foram achadas diferenças significativas entre os desempenhos de projetos executados por unidades operacionais distintas. Os resultados da modelagem indicaram que nem a legislação ambiental, nem os agentes externos exercem influência significativa sobre a sistemática da gestão dos projetos de E&P. Os agentes externos atuam sobre a gestão ambiental da empresa exercitando capacidades colaborativas, obstrutivas e propositivas. A legislação ambiental é percebida como entrave ao desenvolvimento dos projetos ao longo de seu ciclo de vida, principalmente, pelas deficiências dos órgãos ambientais. Identificou-se que o sistema de gestão ambiental influencia diretamente o Programa de Desenvolvimento e Execução de Projetos de E&P, que, por sua vez, provoca efeitos diretos e indiretos sobre o desempenho ambiental. Finalmente, comprovou-se que o Sistema de Gestão Ambiental da empresa é determinante para o desempenho ambiental dos projetos de E&P, tanto pelos seus efeitos diretos, como pelos indiretos, estes últimos mediados pela sistemática de gestão dos projetos de E&P