半导体漂移 扩散方程稳态解的存在性

考虑半导体方程稳态模型的混合边值问题，应用Schauder不动点定理证明了逼近解的存在性，通过一系列先验估计的获得，利用紧致性原理证明了稳态解的存在性.     

半导体漂移-扩散方程速度饱和情形的稳态解

考虑半导体方程稳态模型的混合边值问题，应用Schauder不动点定理证明了逼近解的存在性，通过一系列先验估计的获得，利用紧致性原理证明了稳态解的存在性。     

带有第三边值的捕食模型的正稳态解的存在性

本文研究了一个捕食者带有第三类边界条件、被捕食者带有Neumann边界条件的捕食模型．获得了捕食模型正稳态解的存在性和非存在性结果．并且,证明了它的正稳态解的局部稳定性和唯一性．     

一个一维半导体简化能量输运模型的稳态解

在一维空间中分析带有Dirichlet边界条件的半导体简化能量输运稳态方程组,在某些条件下证明了其古典解的存在性.证明基于对电子密度的漂移扩散型方程的仔细变形和Schauder不动点定理.     

一类可修复计算机系统的最优控制问题

利用Banach空间的相关理论,讨论了一类可修复计算机系统稳态解的最优控制问题,并证明了最优控制元的存在性与唯一性.结果表明,计算机系统的稳态可用度在有限时间内总能到达其期望值.     

具有球对称结构的相对论欧拉方程组稳态解的存在性

对于等温气体,作者将考虑具有球对称结构的相对论欧拉方程组经典稳态解(定理1.1)和弱稳态解(定理1.2)的存在性.通过求解两个常微分方程以及比较马赫数M和1的关系,定理1.1证明了相对论欧拉方程组经典稳态解的存在性.在一个C~(2,α),α∈(0,1)稳态背景解的扰动下,定理1.2将证明高维球对称跨音速(双曲-椭圆)解的存在性.     

非牛顿流体中对称扩散的稳态解

本文研究来源于非牛顿流体等许多物理现象中产生的一类扩散方程的稳态解．这类方程一般具有退化性和奇异性．利用摄动技巧证明了具对称性的古典解的存在性，并在某种一般的条件下讨论了解的唯一性     

一维稳态量子Navier-Stokes方程组古典解的唯一性

文[9]得到了一维稳态量子Navier-Stokes方程组古典解的存在性,本文在某些条件下利用一些不等式技巧继续证明了其解的唯一性.     

一类退化与非退化稳态扩散模型正解的存在性

考虑一类退化与非退化的稳态扩散模型。利用上、正解方法与Schauder不动点原理，证明此类稳态扩散模型在一定条件下正解的存在性。     

边界控制下一阶半线性脉冲调宽采样系统的稳态控制

首先证明了一类一阶非线性系统在周期边界控制下存在全局稳定的周期解.同时,用该结论证明了一类一阶非线性脉冲调宽采样系统存在稳态控制.     

Stability and instability of stationary solutions for sublinear parabolic equations

In the present paper, we study the initial boundary value problem of the sublinear parabolic equation. We prove the existence of solutions and investigate the stability and instability of stationary solutions. We show that a unique positive and a unique negative stationary solutions are exponentially stable and give the exact exponent. We prove that small stationary solutions are unstable. For one space dimensional autonomous equations, we elucidate the structure of stationary solutions and study the stability of all stationary solutions.     

Pullback attractors for a two-dimensional Navier-Stokes model in an infinite delay case

We prove the existence of solutions for a Navier-Stokes model in two dimensions with an external force containing infinite delay effects in the weighted space C_γ(H). Then, under additional suitable assumptions, we prove the existence and uniqueness of a stationary solution and the exponential decay of the solutions of the evolutionary problem to this stationary solution. Finally, we study the existence of pullback attractors for the dynamical system associated to the problem under more general assumptions.     

Existence of weak solutions for steady viscous fluids with general slip boundary conditions

We study the existence of weak solutions for stationary viscous fluids with general slip boundary conditions in this paper. Applying monotone operator theory, we first establish the existence result of weak solutions for an approximation problem. Then using the compactness methods and the point-wise convergence property of velocity gradients, we get the desired results.     

On the semilinear reaction diffusion system arising from nuclear reactors

In this work, the initial-boundary value problem for a class of semilinear reaction-diffusion systems is considered. By an abstract fixed point theorem on positive cone together with an accurate a priori estimate, we establish the coexistence of the positive stationary solutions and the uniqueness of ordered positive stationary solutions. Next, we study the global existence and blowup of positive solutions and obtain a threshold result. Finally, we give the blowup rate estimate of positive blowup solutions.     

A Black-Scholes option pricing model with transaction costs

We consider a boundary value problem for a nonlinear differential equation which arises in an option pricing model with transaction costs. We apply the method of upper and lower solutions in order to obtain solutions for the stationary problem. Moreover, we give conditions for the existence of solutions of the general evolution equation.     

Global existence and asymptotic behavior of smooth solutions to a bipolar Euler–Poisson equation in a bound domain

In this paper, we present a bipolar hydrodynamic model from semiconductor devices and plasmas, which takes the form of bipolar isentropic Euler–Poisson with electric field and frictional damping added to the momentum equations. We firstly prove the existence of the stationary solutions. Next, we present the global existence and the asymptotic behavior of smooth solutions to the initial boundary value problem for a one-dimensional case in a bounded domain. The result is shown by an elementary energy method. Compared with the corresponding initial data case, we find that the asymptotic state is the stationary solution.     

An asymptotic‐induced one‐dimensional model to describe fires in tunnels II: the stationary problem

We study stationary solutions of a one‐dimensional low‐Mach‐number model derived in Gasser and Struckmeier (Math. Meth. Appl. Sci. 2002; 25 (14): 1231) to describe fire events in long tunnels. The existence of solutions of the corresponding stationary model is shown to be equivalent to the existence of solutions of an algebraic problem. Multiple solutions are shown to be possible. The relation between different formulations of the problem is analysed. Weak and special distributional solutions are considered. Finally, numerical examples of realistic tunnel data with single and multiple solutions of the stationary problem are given. Copyright © 2003 John Wiley & Sons, Ltd.     

Stability for the Gravitational Vlasov–Poisson System in Dimension Two

We consider the two dimensional gravitational Vlasov–Poisson system. Using variational methods, we prove the existence of stationary solutions of minimal energy under a Casimir type constraint. The method also provides a stability criterion of these solutions for the evolution problem.