Bessel Functions
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. A Numerical Mode-Matching Method Based on Multiple-Knot Cubic B-Splines Applied to the Analysis of Well-Logging Tools
Abstract The numerical mode-matching (NMM) technique is a very efficient approach to analyze well-logging tools used for hydrocarbon exploration. This problem is typically modeled as a cylindrically layered medium (subterranean formation) including both horizontal and vertical stratifications. In this paper, we present a new NMM formulation based on the use
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-09
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2. Certain Aspects of Univalent Function with Negative Coefficients Defined by Bessel Function
ABSTRACT Key words: In recent years, applications of Bessel functions have been effectively used in the modelling of chemical engineering processes and theory of univalent functions.In this paper, we study a new class of analytic and univalent functions with negative coefficients in the open unit disk defined by Modified Hadamard product with Bessel function
Braz. arch. biol. technol.. Publicado em: 23/01/2017
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3. Thermo-mechanical vibration analysis of annular and circular graphene sheet embedded in an elastic medium
In this study, the vibration behavior of annular and circular graphene sheet coupled with temperature change and under in-plane pre-stressed is studied. Influence of the surrounding elastic medium 011 the fundamental frequencies of the single-layered graphene sheets (SLGSs) is investigated. Both Winkler-type and Pasternak- type models are employed to simulat
Lat. Am. j. solids struct.. Publicado em: 2014-08
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4. Equações diferenciais, separação de variáveis e o problema de forças centrais / Differential equations, separating variables and the central forces problem
Efetuamos um estudo sistemático envolvendo o caso geral de uma equação diferencial parcial, linear, de segunda ordem, com n variáveis independentes. Particularizamos para o caso bidimensional, n = 2, duas variáveis independentes. Utilizamos o método de separação de variáveis para conduzir esta equação diferencial parcial a um conjunto de duas equa
Publicado em: 2011
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5. A novel polar-based human face recognition computational model
Motivated by a recently proposed biologically inspired face recognition approach, we investigated the relation between human behavior and a computational model based on Fourier-Bessel (FB) spatial patterns. We measured human recognition performance of FB filtered face images using an 8-alternative forced-choice method. Test stimuli were generated by converti
Brazilian Journal of Medical and Biological Research. Publicado em: 2009-07
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6. Localized beams in optical tweezers with conventional and metamaterial particles / Feixes localizados em pinças opticas com particulas convencionasi e metamateriais
In this thesis, we explore some applications of localized beams in FSO - Free Space Optics - and optical tweezers, greater emphasis been given to the second one. For FSO, we show that it is possible to choose the desired longitudinal intensity pattern by using optical elements adequately modeled in their phase functions: the axicons. In this way, these beams
Publicado em: 2009
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7. Investigation of the theory of coupling compositis in thermal waves fields / Investigação da teoria de acoplamentos de compósitos em campos de ondas térmicas
In this work we elaborate an analytical solution of the temperature field of an opaque material containing two overlapping and parallel subsurface cylinders, illuminated by a modulated light beam. The method is based on the expansion of plane and cylindrical thermal waves, in series of Bessel and Hankel functions. Firstly, the work shows the model of propaga
Publicado em: 2009
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8. Quasi-static thermal stresses in steady state thick circular plate
The present paper deals with the determination of thermal stresses in a thick circular plate under steady temperature field. A thick circular plate is considered having constant initial temperature and arbitrary heat flux is applied on the upper face with lower face at initial temperature and the fixed circular edge is thermally insulated. Heat is exchanged
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-06
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9. A family of vortex rings and a variational application to potential flows around three-dimensional bodies
A variational formulation and solution of general three-dimensional potential flows gave rise to the construction of a special family of ‘trial functions’. This family is composed by circular-sector vortex rings, here named α-rings, i.e., rings that are positioned on the border of a circular sector with aperture angle α. An explicit formula for the vel
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-06
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10. Corda vibrante e telegrafo : estudo analitico de problemas modelados por equações diferenciais / Vibrating string and telegraphe : an analytical study of problems by differential equations
Efetua-se um estudo sistemático das equações diferenciais parciais, lineares, de segunda ordem e do tipo hiperbólico, isto é, aquelas equações que estão associadas com o problema envolvendo a propagação de ondas. Como uma aplicação, discute-se o problema de ondas de corrente e ondas de tensão, através da chamada equação do telégrafo, também
Publicado em: 2008
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11. Generalized Integral Transform Solution for hydrodynamically developing non-Newtonian flows in circular tubes
The Generalized Integral Transform Technique (GITT) is applied to the solution of the momentum equations in a hydrodynamically developing laminar flow of a non-Newtonian power-law fluid inside a circular duct. A primitive variables formulation is adopted in order to avoid the singularity of the auxiliary eigenvalue problem in terms of Bessel functions at the
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-03
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12. Radial frequency stimuli and sine-wave gratings seem to be processed by distinct contrast brain mechanisms
An assumption commonly made in the study of visual perception is that the lower the contrast threshold for a given stimulus, the more sensitive and selective will be the mechanism that processes it. On the basis of this consideration, we investigated contrast thresholds for two classes of stimuli: sine-wave gratings and radial frequency stimuli (i.e., j0 tar
Brazilian Journal of Medical and Biological Research. Publicado em: 2005-03