Results 21 to 30 of about 493,106 (301)
Mathematics, 2022 The biparametric perturbation method is applied to solve the improved Föppl–von Kármán equation, in which the improvements of equations come from two different aspects: the first aspect concerns materials, and the other is from deformation.
Xiao-Ting He +3 more
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Attainability set of a mechanical controlable system and conditions of robust stability
Revista Iberoamericana de Automática e Informática Industrial RIAI, 2020 In this work, the boundary of the attainabbility set of a second order differential equation with an external perturbation is determined numerically, using the solution of the problem of the maximum variation of the oscillation amplitudes of its ...
R. Temoltzi-Ávila, R Ávila-Pozos
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A Smoothing Method for Sparse Programs by Symmetric Cone Constrained Generalized Equations
Mathematics, 2023 In this paper, we consider a sparse program with symmetric cone constrained parameterized generalized equations (SPSCC). Such a problem is a symmetric cone analogue with vector optimization, and we aim to provide a smoothing framework for dealing with ...
Cong Cheng, Lianjie Tang
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The general solution at large scale for second order perturbations in a scalar field dominated universe [PDF]
Journal of Cosmology and Astroparticle Physics, 2019 In this paper we consider second order perturbations of a flat Friedmann-Lema tre universe whose stress-energy content is a single minimally coupled scalar field with an arbitrary potential. We derive the general solution of the perturbed Einstein equations in explicit form for this class of models when the perturbations are in the super-horizon ...
Uggla, Claes, Wainwright, John
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, 2020 In this paper, classical small perturbations against a stationary solution of the nonlinear Schrodinger equation with the general form of nonlinearity are examined.
Smolyakov, Mikhail N.
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A parameter robust numerical method for a two dimensional reaction-diffusion problem. [PDF]
, 2005 In this paper a singularly perturbed reaction-diffusion partial differential equation in two space dimensions is examined. By means of an appropriate decomposition, we describe the asymptotic behaviour of the solution of problems of this kind.
Clavero, C. +2 more
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Relativistic Zel'dovich approximation in spherically symmetric model [PDF]
, 1997 We compare relativistic approximation methods, which describe gravitational instability in the expanding universe, in a spherically symmetric model. Linear perturbation theory, second-order perturbation theory, relativistic Zel'dovich approximation, and ...
Kasai, Masumi +2 more
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MATEC Web of Conferences, 2019 In this paper we deal with an approximative analytical solution of a second order differential equation with a fast time periodic modulation. We use for this type of the equation a homotopy perturbation method. The validity of this approximative solution
Oršanský Pavol, Ftorek Branislav
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Nonlinear superhorizon perturbations in Horava-Lifshitz gravity
, 2011 We perform a fully nonlinear analysis of superhorizon perturbation in Ho\v{r}ava-Lifshitz gravity, based on the gradient expansion method. We present a concrete expression for the solution of gravity equations up to the second order in the gradient ...
A. A. Starobinsky +3 more
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Rayleigh-Schroedinger-Goldstone variational perturbation theory for many fermion systems
, 2004 We present a Rayleigh-Schroedinger-Goldstone perturbation formalism for many fermion systems. Based on this formalism, variational perturbation scheme which goes beyond the Gaussian approximation is developed.
Chul Koo Kim +23 more
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