Periodic Distributions
Mostrando 1-12 de 25 artigos, teses e dissertações.
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1. Project and Analysis of Quasi-Periodic PBG for Microstrip Antenna
Abstract In this work the influence of quasi-periodic distributions of air holes with 6, 12 and 6-fold modified symmetries, applied to the substrate of a rectangular microstrip patch antenna are analyzed. To validate the study, parameters such as S11 parameter, bandwidth, total gain, radiation pattern and electric field were investigated through computationa
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2020-06
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2. Chromatic Dispersion of an Optical Fiber Based on Photonic Quasicrystals with Twelve-Fold Symmetry and its Application as Directional Coupling
Abstract Optical fibers composed by photonic quasicrystals it is based on aperiodic structures characterized by at least two different symmetrical patterns from the base matrix. In this work, an optical fiber composed by quasi-periodic and symmetric matrix was analyzed using the finite element method in conjunction with cylindrical perfectly matched layers.
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2015-12
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3. Construction of Lyapunov functions for the estimation of basins of attraction
Technical systems are often modeled through systems of differential equations in which the parameters and initial conditions are subject to uncertainties. Usually, special solutions of the differential equations like equilibrium positions and periodic orbits are of importance and frequently the corresponding equations are only set up with the intent to descr
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012
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4. Hipoelipticidade global de campos vetoriais no toro TN
Neste trabalho, veremos que se o operador transposto de um campo vetorial real suave L definido no toro N-dimensional, visto como um operador diferencial linear com coeficientes em C1(TN), for globalmente hipoelíptico, então existe um campo vetorial com coeficientes constantes L0 tal que L e L0 são C1- conjugados, com tais constantes satisfazendo uma cond
Publicado em: 2010
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5. Dynamics towards the Feigenbaum attractor
As an essential component in the demonstration of an atypical, q-deformed, statistical mechanical structure in the dynamics of the Feigenbaum attractor we expose, at a previously unknown level of detail, the features of the dynamics of trajectories that either evolve towards the Feigenbaum attractor or are captured by its matching repellor. Amongst these fea
Brazilian Journal of Physics. Publicado em: 2009-08
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6. On analytic singularities of a class of vector fields on the torus / Sobre singularidades analíticas de soluções de uma classe de campos vetoriais no Toro
O objetivo principal deste trabalho é o estudo da regularidade anallítica global de certos operadores diferenciais definidos no toro. Uma ferramenta fundamental utilizada neste estudo são as séries parciais de Fourier, que nos permitem caracterizar tanto as distribuições periódicas quanto as funções anallíticas reais periódicas através do comport
Publicado em: 2009
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7. Distúrbios do sono : possível causa de déficit de atenção em crianças e adolescentes com Malformação de Chiari Tipo II
Introduction: In Chiari malformation type II (CMII) patients impairment of the cognitive performance is related to the presence of sleep disorders. In spite of the inclusion of cerebral abnormalities in this malformation a significant percentage of these patients have sufficient cognitive function and social interaction for an independent living. The aim of
Publicado em: 2009
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8. Analytical results for the statistical distribution related to a memoryless deterministic walk: Dimensionality effect and mean-field models / "Resultados analíticos para as distribuições estatísticas relacionadas à caminhada determinista do turista sem memória: efeito da dimensionalidade do sistema e modelos de campo médio".
Consider a medium characterized by $N$ points whose coordinates are randomly generated by a uniform distribution along the unitary edges of a $d$-dimensional hypercube. A walker leaves from each point of this disordered medium and moves according to the deterministic rule to go the nearest point which has not been visited in the preceding $mu$ steps. This pr
Publicado em: 2004
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9. Cytoskeletal and cellular adhesion proteins in zebrafish (Danio rerio) myogenesis
The current myogenesis and myofibrillogenesis model has been based mostly on in vitro cell culture studies, and, to a lesser extent, on in situ studies in avian and mammalian embryos. While the more isolated artificial conditions of cells in culture permitted careful structural analysis, the actual in situ cellular structures have not been described in detai
Brazilian Journal of Medical and Biological Research. Publicado em: 2003-08
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10. Roles of Boundary Conditions in DNA Simulations: Analysis of Ion Distributions with the Finite-Difference Poisson-Boltzmann Method
The wide use of lattice-sum strategies in biomolecular simulations has raised many questions on potential artifacts in these strategies. One interesting question is the artifacts in the counterion distributions of highly charged systems. As one would anticipate, Coulombic interactions under the periodic boundary condition may deviate noticeably from those un
The Biophysical Society.
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11. Drift and diffusion in periodic potentials: Upstream and downstream step times are distributed identically
This note deals with particles diffusing in one dimension in the presence of a periodic potential and a uniform driving force. We show that (i) the probabilities for the particle to make a step of the length L, where L is the period, in the upstream and downstream directions are independent of the periodic potential, and (ii) the distributions of the step ti
American Institute of Physics.
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12. Statistical distributions of nucleosomes: nonrandom locations by a stochastic mechanism.
Expressions are derived for distributions of nucleosomes in chromatin. Nucleosomes are placed on DNA at the densities found in bulk chromatin, and their locations are allowed to vary at random. No further assumptions are required to simulate the periodic patterns of digestion obtained with various nucleases. The introduction of a boundary constraint, due for