Stochastic Geometry
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. A Model Updating Method for Plate Elements Using Particle Swarm Optimization (PSO), Modeling the Boundary Flexibility, Including Uncertainties on Material and Dimensional Properties
Abstract It is a well-known fact that, in a real engineering situation, fixtures are not ideally stiff, so numerical simulations using them are unlikely to present results that are consistent with the experimental ones. The present paper intends to describe a model updating methodology inserting translational and rotational springs in order to better represe
Lat. Am. j. solids struct.. Publicado em: 22/10/2018
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2. Updating Finite Element Model Using Stochastic Subspace Identification Method and Bees Optimization Algorithm
Abstract This study investigates the application of operational modal analysis along with bees optimization algorithm for updating the finite element model of structures. Bees algorithm applies instinctive behavior of honeybees as they look for nectar of flowers. The parameters that needed to be updated are uncertain parameters such as geometry and material
Lat. Am. j. solids struct.. Publicado em: 26/04/2018
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3. A Stochastic Reliability Model for Application in a Multidisciplinary Optimization of a Low Pressure Turbine Blade Made of Titanium Aluminide
Abstract Currently, there are a lot of research activities dealing with gamma titanium aluminide (γ-TiAl) alloys as new materials for low pressure turbine (LPT) blades. Even though the scatter in mechanical properties of such intermetallic alloys is more distinctive as in conventional metallic alloys, stochastic investigations on γ -TiAl alloys are very ra
Lat. Am. j. solids struct.. Publicado em: 2016-12
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4. Information geometric similarity measurement for near-random stochastic processes
We outline the information-theoretic differential geometry of gamma distributions, which contain exponential distributions as a special case, and log-gamma distributions. Our arguments support the opinion that these distributions have a natural role in representing departures from randomness, uniformity, and Gaussian behavior in stochastic processes. We show
Publicado em: 2011
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5. Heteropentámeros (etanol)4-agua: estudio estructural y termodinámico
Stochastic exploration of the potential energy surface of (ethanol)4-water heteropentamers through simulated annealing calculations was used to find probable structures of these clusters. Subsequent geometry optimization with the B3LYP/6-31+G(d) approach of these initial structures led to 13 stable heteropentamers. The strength of the hydrogen bonds of the t
Química Nova. Publicado em: 2010
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6. Difusões em variedades de poisson / Poisson manifolds diffusions
O objetivo desse trabalho é estudar as equações de Hamilton no contexto estocástico. Sendo necessário para tal um pouco de conhecimento a cerca dos seguintes assuntos: cálculo estocástico, geometria de segunda ordem, estruturas simpléticas e de Poisson. Abordamos importantes resultados, dentre eles o teorema de Darboux (coordenadas locais) em varieda
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/08/2009
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7. Geometria dos caminhos em grupos de Lie / Path geometry in Lie groups
Neste trabalho estudamos a geometria dos caminhos em grupos de Lie usando a exponencial estocástica e o logaritmo estocástico. Apresentamos as construções geométricas do espaço tangente, uma métrica e uma conexão natural as caminhos em grupos de Lie. Finalmente apresentamos uma situação em que essa conexão é Levi-Civita e outra que não é
Publicado em: 2009
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8. Calculo estocastico em variedades folheadas / Stochastic calculus on foliated manifolds
We study stochastic process on foliated manifolds. First we introduce some operators, which we call foliated, and study their properties. With these objects, we define the natural processes on foliated spaces, such as foliated martingales and foliated Brownian motion. We study how they are related with the geometry of the foliation and use them to characteri
Publicado em: 2009
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9. Martingales no fibrado de bases e seções harmonicas via calculo estocastico / Martingales in frame bundles and harmonic sections through stochastic calculus
Neste trabalho estudamos os martingales no fibrado de bases e suas relações com os martingales no fibrado tangente. Caracterizamos as aplicações harmônicas a valores no fibrado de bases e as relacionamos com as aplicações harmônicas a valores no fibrado tangente. Numa segunda parte estudamos a harmonicidade das seções de um fibrado via geometria es
Publicado em: 2007
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10. Calculating the dimension of a Euclidian Quantum Gravity model / Cálculo da dimensão em um modelo de gravitação quântica euclidiana
This work had the intention of calculating the dimension of a Euclidian Quantum Gravity model which in based on the formalism of non commutative geometry. This work is a continuation of the article [4]. From [4] we know that using a commutative spectral triple allows us to generalize and treat ordinary geometry in a purely algebraic manner. From Non commutat
Publicado em: 2007
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11. Movimento bidirecional no transporte intracelular mediado por motores moleculares / Bidirectional movement in the intracellular transport mediated by molecular motors
In this work we present a theoretical model to describe aspects of the bidirectional movement performed by intracellular structures (vesicles, organelles, viruses etc, to which we refer here simply as "vesicles"), observed essentially at in vivo experiments. This nondifusive movement is characterized by rapid inversions in direction and is capable of creatin
Publicado em: 2007
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12. Harmonic mappings and martingales in manifolds / Aplicações harmonicas e martingales em variedades
In this work we explore results of harmonic mappings, via stochastic calculus in manifolds. The text is organized as follows: In the first two chapters, we introduce concepts and results about stochastic calculus in Rn, differential geometry and Lie groups. In the third chapter we have the definitions of harmonic mappings and the Euler-Lagrange equation. Fin
Publicado em: 2005