Generalized Nonlinear Sine-Gordon Equation

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A Reduced-Order Extrapolating Finite Difference Iterative Scheme for 2D Generalized Nonlinear Sine-Gordon Equation

A Reduced-Order Extrapolating Finite Difference Iterative Scheme for 2D Generalized Nonlinear Sine-Gordon Equation

As far as we know, there exists not any report that the POD method is utilized to simplify the classical FD scheme for the 2D generalized nonlinear Sine-Gordon equation. Therefore, in this work, we extend the approaches in [22-25] to the 2D generalized nonlinear Sine-Gordon equation, employing the POD technique to build a reduced-order extrapolating finite difference iterative (ROEFDI) scheme containing very few unknowns but having high enough accuracy. Especially, we are going to analyze the stability and convergence of the ROEFDI solutions by theoretical analysis and verify the feasibility and effectiveness of the ROEFDI scheme via numerical simulations.
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New study to construct new solitary wave solutions for generalized sinh- Gordon equation

New study to construct new solitary wave solutions for generalized sinh- Gordon equation

Wehave developed successfully introduce the homogeneous balance method and ob- tained wider classes of exact traveling wave solutions for the generalized sineGordon equation by using this binary method. This implies that our method is more powerful and effective in finding the exact solutions of NLEEs in mathematical physics.We hope this method can be more effectively used to solve many nonlinear partial differential equations in applied mathematics, engineering and mathematical physics.

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Global Attractors for a Class of Generalized Nonlinear Kirchhoff Sine Gordon Equation

Global Attractors for a Class of Generalized Nonlinear Kirchhoff Sine Gordon Equation

u with respect to the variable t; u xx is the two-order partial derivative of the u about the independent variable x. Subsequently, Zhu [4] considered the following problem: u tt − α u t − u xx + λ g ( sin u ) = f x t ( ) , (where Ω is a bounded domain of R 3 ) and he proved the existence of the global solution of the equation. For more research on the global solutions and global attractors of Kirchhoff and sine-Gordon equations, we refer the reader to [5]-[11].

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Generalized solution of Sine-Gordon equation

Generalized solution of Sine-Gordon equation

sense in the algebra G. Therefore the algebra G is a very convenient one to find and study solutions of nonlinear differential equations with singular data and coefficients. The paper is placed in the framework of algebras of generalized functions introduced by Colombeau in [4, 5]. Note also several examples have been studied by many authors in [12], [15, 16, 17] [13,16,17]. In particular, the authors [18] [18] processing the nonlinear wave with a data u|{t < 0} = 0. In this paper, we study the Sine- Gordon equation which a nonlinear wave, but in this time with conditions initial are distribution. The paper is organized as follows. In section 2, we recall the theory of Colombeau. Section 3, we proved the existence and uniqueness of solution in the algebra of Colombeau. The association with the classical solution is established in Section 4
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A New Conservative Difference Scheme for the General Rosenau-RLW Equation

A New Conservative Difference Scheme for the General Rosenau-RLW Equation

It is known the conservative scheme is better than the nonconservative ones. Zhang et al. 1 point out that the nonconservative scheme may easily show nonlinear blow up. In 2 Li and Vu-Quoc said “. . . in some areas, the ability to preserve some invariant properties of the original differential equation is a criterion to judge the success of a numerical simulation”. In 3–11 , some conservative finite difference schemes were used for a system of the generalized nonlinear Schr ¨odinger equations, Regularized long wave RLW equations, Sine-Gordon equation, Klein-Gordon equation, Zakharov equations, Rosenau equation, respectively. Numerical results of all the schemes are very good. Hence, we propose a new conservative difference scheme for the general Rosenau-RLW equation, which simulates conservative laws 1.4 and 1.5 at the same time. The outline of the paper is as follows. In Section 2, a nonlinear difference scheme is proposed and corresponding convergence and stability of the scheme are proved. In Section 3, some numerical experiments are shown.
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Exact solution of nonlinear Klein-Gordon equations with quadratic nonlinearity by modified Adomian decomposition method

Exact solution of nonlinear Klein-Gordon equations with quadratic nonlinearity by modified Adomian decomposition method

Abstract. In this paper, we used the modified Adomian decomposition method (ADM) to obtain exact solution to Nonlinear Klein-Gordon equation (NK-GE) with quadratic nonlinearity. The paper contains an introduction and the concept of modified ADM for a generalized three-dimensional NK-GE. And, we applied this concept to obtain exact solution to two one-dimensional NK-GE with quadratic nonlinearity. The modified method is based on Taylors series expansion of the source term and implementation on any computer algebra software (Maple, Mathematica, etc) is simple. We discovered that the results of the examples considered are the same as the series solution of those obtained by using any known analytical method. Furthemore, we depicted our findings in three- dimensional surface and contour plots.
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EXACT SOLUTIONS FOR SOME NONLINEAR FRACTIONAL PARABOLIC EQUATIONS

EXACT SOLUTIONS FOR SOME NONLINEAR FRACTIONAL PARABOLIC EQUATIONS

INTERNATIONAL JOURNAL OF ADVANCES IN ENGINEERING RESEARCH (25)And so on, where μ is a constant. The positive integer M in Eq.(24)can be determined by considering the homogeneous balance between the highest-order derivatives and nonlinear terms appearing in Eq.(23) If M is equal to a fractional or negative number, we can take the following transformations [4].

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Breathers in the elliptic sine-Gordon model

Breathers in the elliptic sine-Gordon model

negative real part can not be explained on the basis of the Breit-Wigner formula. Their occurence can be avoided by an additional breaking of parity (see discussion in [33]). The restriction on the parameters makes the model somewhat unattractive as this limitation eliminates the analogue of the entire breather sector which is present in the sine-Gordon model, such also that in the trigonometric limit one only obtains the soliton-antisoliton sector of that model, instead of a theory with a richer particle content. For this reason, the arguments outlined in the introduction and the fact that the constraint does not yield any Tachyon free theory anyhow, we relax here the restriction on ν. The the poles
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The General Analytical and Numerical Solution for the Nonlinear Klein-Gordon Equation

The General Analytical and Numerical Solution for the Nonlinear Klein-Gordon Equation

The element D is the third 4-D constant of integration, z0 is arbitrary constant and the function Sn[...] is the Jaco- bi elliptic function. Above proposition gives us the general analytical solution for the KleinGordon equation in terms of the 4-D commutative hypercomplex variable Z. It is the complete solution for the ODE form in as much as we have integrated twice and have a solution including two arbitrary constants of integration.

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Solitons: A Cutting Edge Scientific Proposal Explaining the Mechanisms of Acupuntural Action

Solitons: A Cutting Edge Scientific Proposal Explaining the Mechanisms of Acupuntural Action

When the metal received energy, the atoms vibrated; but their electrons re- mained in the “metal grid”, vibrating in unison; that is , collectively , and pro- ducing a certain “ note ”, possibly associated with a particular type of energy [67]. To observe the behavior of the energy as vibratory notes in the grid, Fermi, Pasta and Ulam curiously prepared a model of five musical notes (as it is used during the Therapeutic Acupunctural Resonance ) looking for how they interacted with the grid. The nonlinear behavior of the experience transformed the grid into an ideal field for solitons : when a vibrational frequency lost energy, the solitonic interconnections allowed another to begin to gain it from the others, agglome- rating successively in each modality [66].
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Generalized Difference Formula for a Nonlinear Equation

Generalized Difference Formula for a Nonlinear Equation

f x = equation. Among the methods, iteration methods are very popular and are used by many researchers. Bisection method, fixed point iteration, secant method and … [1] – [3] and [8] – [10] are among various methods used for solving these problems.

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Necessary conditions for breathers on continuous media to approximate breathers on discrete lattices

Necessary conditions for breathers on continuous media to approximate breathers on discrete lattices

and ω = ω( e x, e t). The level surfaces of θ and φ can be recognized as waves with two distinct slowly varying wave speeds. The moving breather will be periodic in θ with local wave number ωk/µ, local frequency ω 2 /µ and local phase velocity ω/k. The short scale φ is required to model the second slowly varying wave speed k/ω. The moving breather is not periodic in φ; however, the solution is exponentially small outside a short interval. These definitions are a generalization of the definition of the local wave number and local frequency for a strongly nonlinear wave train (see, for example, [36]), this formulation being based on the Lorentz invariance of the unperturbed problem. If k = 0, then we recover the fast scales for the stationary breather except that θ t = − ω. The definitions
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An Expansion Based on Sine-Gordon Equation to Solve KdV and modified KdV Equations in Conformable Fractional Forms

An Expansion Based on Sine-Gordon Equation to Solve KdV and modified KdV Equations in Conformable Fractional Forms

such as various forms of Kudryashov approach, exponential rational function tech- nique, simple hyperbolic ansatzes [13–22], the fractional form of the Sine-Gordon equation method is implemented to both equations to derive exact solutions in traveling wave forms. Before constructing the solutions, some preliminaries and basic properties of conformable derivative are given below. A brief summary of the method is also given in the next sections.

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Analysis of the Motion of Frenkel Kontorova Dislocations in Single Crystals of Aluminum with Allowance for the Peierls Barrier

Analysis of the Motion of Frenkel Kontorova Dislocations in Single Crystals of Aluminum with Allowance for the Peierls Barrier

The simulation was carried out using sine Gordon equation for the one-dimensional Frenkel-Kontorova dislocation model. In the Frenkel-Kontorova model, the atoms above the glide plane are material points connected by springs of rigidity « k », and the atoms under the glide plane (substrate) are described by a sinusoidal potential. The Frenkel-Kontorova model is discrete and this is its ad- vantage over other models. Within the framework of the chosen model, the mo- tion of dislocations is described by the sine Gordon equation.

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1-Soliton Solution of the Biswas-Milovic Equation With Log Law Nonlinearity

1-Soliton Solution of the Biswas-Milovic Equation With Log Law Nonlinearity

This paper studied the BME with log law nonlinearity. The 1-soliton solution was obtained by the ansatz method. This solution is also known as Gausson in the context of nonlinear optics. A couple of conserved quantities are also obtained using the Gausson solution. The constraint relation also fell out naturally from the solution. An exact solution with the IMD perturbation term taken into account is also derived.

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The Finite Difference Methods for –Nonlinear Klein Gordon Equation

The Finite Difference Methods for –Nonlinear Klein Gordon Equation

describes, for example, structural phase transitions in ferroelectric and ferromagnetic materials, topological excitations in quasi one dimensional system like biological macromolecules and hydrogen chains, or polymers, etc. Its simplest localized solutions so-called ”kinks” which are related to the motion of the aforementioned topological excitations, e.g., domain walls in second order phase transitions, or polymerization mismatches. A more realistic modeling of physical situation in condensed matter physics often requires the inclusion of perturbations of different types like thermal noise and time or spatial dependent potential fluctuations [ 8 ]. The equation was first proposed by Aubry , Krumhansl and Schrieffer in 1975 and 1976, to describe displacive and order-disorder transitions in solids, mainly magnetic compounds [9 ]. Manna and Merle (1997) used multiple- sale perturbation theory. They showed that a nonlinear (quadratic) Klein – Gordon type equation substitutes in a short- wave analysis the ubiquitous Korteweg-de Vries equation of long-wave approach. Dmitriev et. al. (2006) discussed some discrete equations free of the peierls-Nabarro barrier and identified for them the full space of available static solutions, including those derived recently in physics but not limited to them [1].
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Infinite sets of polynomial conserved densities for nonlinear evolution equations

Infinite sets of polynomial conserved densities for nonlinear evolution equations

The infinite sets of polynomial conserved densities which have been found for the Korteweg-de Vries equation, the modified Korteweg-de Vries equation, the Sine-Gordon equation, and the c[r]

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Degenerate multi-solitons in the sine-Gordon equation

Degenerate multi-solitons in the sine-Gordon equation

Finally we explore how the degenerate solutions may be obtained within the context of Hirota’s direct method [31]. The key idea of this solution procedure is to convert the original nonlinear equations into bilinear forms, which can be solved systematically. When parameterizing φ(x, t) = 2i ln[g(x, t)/f (x, t)] the sine-Gordon equation (1.1) was found [6, 31] to be equivalent to the two equations

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Legendre spectral element method for solving sine Gordon equation

Legendre spectral element method for solving sine Gordon equation

strained optimal control problem. An alternating direction implicit (ADI) Legendre spec- tral element method for the two-dimensional Schrodinger equation is developed in [8], and the optimal H 1 error estimate for the linear case is given. The aim of [9] is the Lagrange–Galerkin spectral element method for solving two-dimensional shallow water equations. The authors of [10] considered the numerical approximation of the acoustic wave equation by the spectral element method based on the Gauss–Lobatto–Legendre quadrature formulas and finite difference Newmark’s explicit time advancing schemes. A modified set of basis functions for use with spectral element methods is presented in [11] for solving a mixed elliptic boundary value problem. These basis functions are constructed so that the axial conditions along a plane or axis of symmetry are satisfied identically. A numerical spectral element method for the computation of fluid flows governed by the incompressible Euler equations in a complex geometry is presented in [12]. Zhuang and Chen [13] used this method to solve biharmonic equations. In [14], the authors used the spectral element method with least-square formulation for parabolic interface problems. Ai et al. [15] used fully diagonalized Legendre spectral element methods using Sobolev orthogonal/biorthogonal basis functions for solving second-order elliptic boundary value problems. A Legendre spectral element formulation of an improved time-splitting method is developed for the natural convection heat transfer problem in a square cavity by Wang and Qin [16].
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