Stochastic Particle Dynamics
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. CFD-optimization algorithm to optimize the energy transport in pultruded polymer composites
Pultrusion is a composite manufacturing process in which fibers are pulled continuously through a resin bath for resin impregnation before entering into a heated die, where an exothermic cure reaction occurs. The energy needed to provide the cure reaction depends on many aspects such as cure kinetics and pulling speed. Generally, the pultrusion forming is di
Braz. J. Chem. Eng.. Publicado em: 2012-09
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2. Extensão do modelo Raise and Peel / Extension of the Raise and Peel model
O modelo raise and peel é um modelo estocástico unidimensional com absorção local e desorção não local. O modelo depende de um único parâmetro u que é a razão entre a taxa de absorção pela de dessorção. Em um valor especial deste parâmetro (u = 1) o modelo tem características interessantes. O espectro é descrito por uma teoria de campos con
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011
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3. Sistemas de partículas interagentes dependentes de tipo e aplicações ao estudo de redes de sinalização biológica / Type-dependent interacting particle systems and their applications in the study of signaling biological networks
We study type-dependent stochastic spin models proposed by Fernández et al., which were used to model biological signaling networks. The original modeling setup describes the macroscopic evolution of a finite-size spin-flip model with k types of spins with arbitrary number of internal states interacting through a non-reversible stochastic dynamics. In the t
Publicado em: 2011
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4. On the prediction of psd in antisolvent mediated crystallization processes based on fokker-planck equations
A phenomenological model for the description of antisolvent mediated crystal growth processes is presented. The crystal size growth dynamics is supposed to be driven by a deterministic growth factor coupled to a stochastic component. Two different models for the stochastic component are investigated: a Linear and a Geometric Brownian motion terms. The evolut
Brazilian Journal of Chemical Engineering. Publicado em: 2010-09
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5. Parametric resonance in dissipative field dynamics
The effects of bosonic trilinear interactions are investigated in the process of resonant particle production. We study a generic model of three fields with trilinear couplings. In this model a scalar field Φ can excite a heavy bosonic field χ which then decays into a light bosonic field σ. We study the consequences of dissipation and stochastic noise ter
Brazilian Journal of Physics. Publicado em: 2008-09
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6. Simulation of dense colloids
We present in this proceeding recent large scale simulations of dense colloids. On one hand we simulate model clay consisting of nanometric aluminum oxyde spheres in water using realistic effective electrostatic interactions and Van der Waals attractions, known as DLVO potentials and a combination of molecular dynamics (MD) and stochastic rotation dynamics (
Brazilian Journal of Physics. Publicado em: 2008-03
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7. 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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8. A new method to study stochastic growth equations: application to the Edwards-Wilkinson equation
In this work we introduce a method to study stochastic growth equations, which follows a dynamics based on cellular automata modeling. The method defines an interface growth process that depends on height differences between neighbors. The growth rules assign a probability p i(t) for site i to receive a particle at time t, where p i(t) = rho exp[
Brazilian Journal of Physics. Publicado em: 2006-09
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9. Stochastic Molecular Dynamics of colloidal particles
Colloidal particles move in the carrier liquid under the action of several forces and torques. When the particles carry a dipole moment, electric or magnetic, as in ferrofluids, the rotational and translational motions are coupled because the field on a particle depends on the spatial and directional distribution of the others and the force and torque on it
Brazilian Journal of Physics. Publicado em: 2004-06
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10. Stochastic Effects in Microstructure
We are currently studying microstructural responses to diffusion-limited coarsening in two-phase materials. A mathematical solution to late-stage multiparticle diffusion in finite systems is formulated with account taken of particle-particle interactions and their microstructural correlations, or "locales". The transition from finite system behavior to that
Materials Research. Publicado em: 2002-09
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11. Rotational dynamics of the magnetic moments in ferrofluids
We present a set of six non-linear stochastic diffferential equations for the six variables which are relevant for the dynamical behavior of the magnetic moments in ferrofluids, namely, the three Euler angles of the magnetic particle, the two polar angles of the magnetic moment relative to the particle and the modulus of the magnetic moment. The interaction
Braz. J. Phys.. Publicado em: 2001-09
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12. Dinamica não linear e interações de defeitos topologicos e solitons na presença de forças externas e impurezas
We study the catastrophes that can occur in kink dynamics in the presence of external forces and impurities. Under the action of some anharmonic forces it can occurs that not only the translational mode is unstable but also the internal modes ( shape modes) or even part of the continuum spectrum ( the soliton is unstable against the interaction with phonons!
Publicado em: 1999