MSPRK Methods for the Korteweg-de Vries Equation

We consider the Korteweg-de Vries (KdV) equation in the form ut+uux+uxxx=0(1) which is a nonlinear hyperbolic equation and has smooth solutions for all the time. There are a vast of results can be found in the literature for this equation, both theoretical and numerical. However, several good reasons account for needs of another numerical study of this equation are listed in[1]. Among them, the most convincing one might be that the wave equations have the multi-symplectic structure (cf. [2]), and the KdV equation is therefore a     

The Cauchy Problem for the Generalized Korteweg-de Vries-Benjamin-Ono Equation with Low Regularity Data

The Cauchy problem of the generalized Korteweg-de Vries-Benjamin-Ono equation is considered, and low regularity and limit behavior of the solutions are obtained. For k = 1, local well- posedness is obtained for data in H^s（R）（s 〉 -3/4）. For k = 2, local result for data in H^S（R）（s 〉1/4） is obtained. For k = 3, local result for data in H^S（R）（s 〉 -1/6） is obtained. Moreover, the solutions of generalized Korteweg-de Vries-Benjamin-Ono equation converge to the solutions of KdV equation if the term of Benjamin-Ono equation tends to zero.     

Large Time Asymptotics for the BBM–Burgers Equation

We study large time asymptotics of solutions to the BBM–Burgers equation

Precise Asymptotics for Lévy Processes

Let {X（t）, t ≥ 0} be a Lévy process with EX（1） = 0 and EX^2（1） 〈 ∞. In this paper, we shall give two precise asymptotic theorems for {X（t）, t 〉 0}. By the way, we prove the corresponding conclusions for strictly stable processes and a general precise asymptotic proposition for sums of i.i.d. random variables.     

Positive and Nontrivial Solutions for the Urysohn Integral Equation

We establish new criteria for the existence of either positive or nonzero solutions of the Urysohn integral equation. We also discuss the existence of an interval of positive eigenvalues and sufficient conditions for the existence of at least a positive eigenvalue with a nonzero or positive eigenfunction for the Urysohn integral operator. Among others, we employ techniques based on fixed point index theory for compact maps, which are new for this type of equation.     

Low Regularity Solution of the Initial-Boundary-Value Problem for the ＂Good＂ Boussinesq Equation on the Half Line

we study an initial-boundary-value problem for the ＂good＂ Boussinesq equation on the half line
{δt^2u-δx^2u＋δx^4u＋δx^2u^2=0,t〉0,x〉0.
u（0,t）=h1（t）,δx^2u（0,t） =δth2（t）,
u（x,0）=f（x）,δtu（x,0）=δxh（x）.
The existence and uniqueness of low reguality solution to the initial-boundary-value problem is proved when the initial-boundary data （f, h, h1, h2） belong to the product space
H^5（R^＋）×H^s-1（R^＋）×H^s/2＋1/4（R^＋）×H^s/2＋1/4（R^＋）
1 The analyticity of the solution mapping between the initial-boundary-data and the with 0 ≤ s 〈 1/2. solution space is also considered.     

Attractors of the Derivative Complex Ginzburg-Landau Equation in Unbounded Domains

We consider the following initial boundary problem of derivative complex Ginzburg-Landau （DCGL） equation     

高维弱扰动破裂孤子波方程行波解

研究了一类高维弱扰动破裂孤子波方程.首先讨论了对应的典型破裂孤子波方程, 利用待定系数投射方法得到了孤子波精确解.再利用泛函分析和摄动理论得到了原弱扰动破裂孤子波方程的孤子行波渐近解.最后, 举出例子说明了用该方法得到的弱扰动破裂孤子波方程的行波渐近解具有简捷、有效和较高精度的优点.     

Asymptotics on Two-dimensional Recursion Sequences

In this paper, we give precise formulas for the general two-dimensional recursion sequences by generating function method, and make use of the multivariate generating functions asymptotic estimation technique to compute their asymptotic values.     

Asymptotic Speed of Wave Propagation for A Discrete Reaction-Diffusion Equation

We deal with asymptotic speed of wave propagation for a discrete reactlon-diffusion equation. We find the minimal wave speed c★ from the characteristic equation and show that c★ is just the asymptotic speed of wave propagation. The isotropic property and the existence of solution of the initial value problem for the given equation are also discussed.     

An exact solution to the Korteweg–de Vries–Burgers equation

In this letter, applying a series of coordinate transformations, we obtain a new class of solutions of the Korteweg–de Vries–Burgers equation, which arises in the theory of ferroelectricity.     

Numerical Analysis of the Boundary-Value Problem for a Nonlinear Korteweg–De Vries–Burgers Equation

The paper presents the results of a numerical analysis of the boundary-value problem for a nonlinear Korteweg–de Vries–Burgers equation with two small parameters at the high-order derivatives. An approximation of higher order of accuracy is used to construct an iterative difference spline scheme and to obtain a numerical solution of the third-order equation subject to certain relationships between the two small parameters and the space and time increments. The behavior of the solution of the boundary-value problem is investigated for various parameters at the second and third derivative and for various time and space increments of the difference grid. The interaction of the solution of the degenerate problem (without the third derivative) with the solution of the equation containing two small parameters is investigated numerically.     

Explicit Complex-Valued Solutions of the Korteweg–de Vries Equation on the Half-Line and on the Whole-Line

The paper deals with the initial-value problems for the Korteweg–de Vries (KdV) equations on the half-line and on the whole-line for complex-valued measurable and exponentially decreasing potentials. The time evolution equation for the reflection coefficient is derived and then a one-to-one correspondence between the scattering data and the solution of the KdV equation is shown. Families of exact solutions of the KdV equation are represented for the class of reflection-free potentials, in which the inverse scattering problem associated with the KdV equation can be solved exactly. Some helpful examples of soliton solutions of the KdV equation are provided.     

广义Kdv-Burgers方程的边界能稳性

考虑Kdv—Burgers方程在区间[0，1]上的边界反馈控制，在边界控制律u(0，t)＝ux(1，t)-g1(u(1，t))＝uzx(1，t)-g2(u(1，t))＝0下，证明了该方程是L^2整体指数稳定，H^1整体渐近稳定和H^1半整体指数稳定的．     

Controllability of the Korteweg-de Vries-Burgers Equation

In this paper, we investigate the controllability of the Korteweg-de Vries-Burgers equation on a periodic domain $\mathbb{T}=\mathbb{R}/(2\pi\mathbb{Z})$. With the aid of the classical duality approach and a fixed-point argument, the local exact controllability is established.     

On the controllability of the fifth-order Korteweg–de Vries equation

In this paper, we consider the fifth-order Korteweg–de Vries equation in a bounded interval. We prove that this equation is locally well-posed when endowed with suitable boundary conditions, and establish a result of local controllability to the trajectories.