Integrals
Mostrando 1-12 de 156 artigos, teses e dissertações.
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1. Existence, Uniqueness, and Approximation for Solutions of a Functional-integral Equation in Lp Spaces
RESUMO Neste trabalho estabelecemos condições que garantem existência e unicidade de solução da equação integral-funcional geral y ( t ) = f ( t , ∫ 0 1 k ( t , s ) g ( s , y ( s ) ) d s ) , t ∈ [ 0 , 1 ] , em L p ( [ 0 , 1 ] ), com 1 p ∞. Utilizamos o Teorema de Ponto Fixo de Banach e aplicamos o método de aproximações sucessi
TEMA (São Carlos). Publicado em: 13/12/2019
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2. Practical rules for summing the series of the Tweedie probability density function with high-precision arithmetic
Abstract: For some ranges of its parameters and arguments, the series for Tweedie probability density functions are sometimes exceedingly difficult to sum numerically. Existing numerical implementations utilizing inversion techniques and properties of stable distributions can cope with these problems, but no single one is successful in all cases. In this wor
An. Acad. Bras. Ciênc.. Publicado em: 02/12/2019
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3. Boundary Layer Effects in a Finite Linearly Elastic Peridynamic Bar
Abstract The peridynamic theory is an extension of the classical continuum mechanics theory. The peridynamic governing equations involve integrals of interaction forces between near particles separated by finite distances. These forces depend upon the relative displacements between material points within a body. On the other hand, the classical governing equ
Lat. Am. j. solids struct.. Publicado em: 22/10/2018
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4. Moment of inertia through scaling and the parallel axis theorem
Abstract A right triangular plate scaled by a factor two generates a bigger plate composed of four triangular plates the same size as the original. By using dimensional analysis we write the moment of inertia around the center of mass, for the original and the bigger plate, in terms of a common unknown parameter. Through the parallel axis theorem we relate t
Rev. Bras. Ensino Fís.. Publicado em: 02/08/2018
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5. Welfare of cattle kept in intensive silvopastoral systems: A case report
ABSTRACT The objective of this research was to evaluate the effect of three different intensive silvopastoral systems (ISPS) on cattle animal welfare (AW) in Colombia. The three ISPS differed in area, plant composition, and grazing periods as follows: ISPS1 - low plant diversity in paddocks of 1200 m2, with grazing period of 24 h; ISPS2 - middle plant divers
R. Bras. Zootec.. Publicado em: 2017-06
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6. An Improved Method for Acquisition of the Parameters of Jiles-Atherton Hysteresis Scalar Model Using Integral Calculus
Abstract An accurate modeling of materials is essential to obtain reliable results in fields calculation. The Jiles-Atherton approach is widely used for modeling the magnetic hysteresis and depends on its set of five parameters to properly represent material. In this article is proposed an original methodology for obtaining this set of parameters avoiding th
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2017-03
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7. Green's function based finite element formulations for isotropic seepage analysis with free surface
Abstract A solution procedure using the Green's function based finite element method (FEM) is presented for two-dimensional nonlinear steady-state seepage analysis with the presence of free surface in isotropic dams. In the present algorithm, an iteration strategy is designed to convert the over-specified free surface problem to a regular partial differentia
Lat. Am. j. solids struct.. Publicado em: 2015-10
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8. A New Displacement-based Approach to Calculate Stress Intensity Factors With the Boundary Element Method
Abstract The analysis of cracked brittle mechanical components considering linear elastic fracture mechanics is usually reduced to the evaluation of stress intensity factors (SIFs). The SIF calculation can be carried out experimentally, theoretically or numerically. Each methodology has its own advantages but the use of numerical methods has become very popu
Lat. Am. j. solids struct.. Publicado em: 2015-09
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9. Transverse Motions of Rectangular Plates Resting on Elastic Foundation and Under Concentrated Masses Moving at Varying Velocities
AbstractThis study concerns the dynamic characteristics of a prestressed isotropic, rectangular plate continuously supported by an elastic foundation and carrying accelerating mass M. Closed form solutions of the governing fourth order partial differential equations with variable and singular coefficients are presented. For the two-dimensional plate problem,
Lat. Am. j. solids struct.. Publicado em: 2015-07
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10. Trefftz- type FEM for solving orthotropic potential problems
A simple Trefftz-type finite element method (TFEM) is proposed for solving certain potential problems in orthotropic media. The "body force", which is induced by internal sources or sinks, may produce domain integrals in the standard Trefftz finite element formulation. This will make the advantage "only-boundary integration" of TFEM lose entirely. To overcom
Lat. Am. j. solids struct.. Publicado em: 2014
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11. The use of Gauss-Hermite quadrature in the determination of the molecular weight distribution of linear polymers by rheometry
The molecular weight distribution (MWD) and its parameters are of the fundamental importance in the characterization of polymers. Therefore, the development of techniques for faster MWD determination is a relevant issue. This paper aims at implementing one of the relaxation models from double reptation theory proposed in the literature and analyzing the nume
Braz. J. Chem. Eng.. Publicado em: 2013-12
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12. Boundary element method applied to the bending analysis of thin functionally graded plates
The present work introduces the boundary element method applied to the bending analysis of functionally graded plates. It is assumed that material properties are graded through the thickness direction of the plate according to a power law distribution. The neutral surface position for such plate is determined and the classical plate theory based on the exact
Lat. Am. j. solids struct.. Publicado em: 2013-05