一类含梯度项的二阶半线性椭圆型方程的爆炸解

本文运用非线性变换、摄动方法结合上、下解方法得到了一类含梯度项的二阶半线性椭圆型方程爆炸解的存在性．     

The asymptotic behaviour of solutions with blow-up at the boundary for semilinear elliptic problems

By constructing the comparison functions and the perturbed method, it is showed that any solution u∈C²(Ω) to the semilinear elliptic problems Δu=k(x)g(u), x∈Ω, u_|∂Ω=+∞ satisfies , where Ω is a bounded domain with smooth boundary in RN; , −2<σ, c₀>0, ; g∈C¹[0,∞), g?0 and is increasing on (0,∞), there exists ρ>0 such that , ∀ξ>0, , .     

一类半线性椭圆型方程爆炸解的存在性与渐近行为

设Ω是Ｒ＾Ｎ（Ｎ≥２）中的Ｃ＾２有界区域,对非线性项带有适当的梯度与无界系数ｋ（ｘ）,首先应用非线性变换将爆炸解问题,转化成等价的带奇异项的Ｄｉｒｉｃｈｌｅｔ问题,应用极大值原理得到爆炸解问题的最小爆炸速度。随后,应用摄动方法,结合上下解方法与椭圆型方程的估计理论得到了爆炸解的存在性。     

具有对流项的一类非线性椭圆型问题爆炸解的精确渐近行为

设Ω是RN中的有界光滑区域．应用Karamata正规变化理论和摄动方法.构造比较函数．得到了问题的解在边界附近的精确渐近行为和解的唯一性,其中g在无穷远处以指数1 ρ(ρ>0)正规变化．b在Ω内非负非平凡并且允许在边界为0．     

一类奇异边值问题解的存在性

在非线性项系数无界的情形下，得到了一类半线性椭圆型方程爆破解的存在性。     

The exact asymptotic behaviour of the unique solution to a singular nonlinear Dirichlet problem

By Karamata regular varying theory, a perturbed argument and constructing comparison functions, we show the exact asymptotic behaviour of the unique solution near the boundary to a singular Dirichlet problem −Δu=b(x)g(u)+λf(u), u>0, x∈Ω, u_|∂Ω=0, which is independent on λf(u), and we also show the existence and uniqueness of solutions to the problem, where Ω is a bounded domain with smooth boundary in RN, λ>0, g∈C¹((0,∞),(0,∞)) and there exists γ>1 such that , ∀ξ>0, , the function is decreasing on (0,∞) for some s₀>0, and b is nonnegative nontrivial on Ω, which may be vanishing on the boundary.     

A global bifurcation result for a semilinear elliptic equation

We consider the problem

     

Global Existence and Asymptotic Behavior for the 3D Compressible Non–isentropic Euler Equations with Damping

We investigate the global existence and asymptotic behavior of classical solutions for the 3D compressible non-isentropic damped Euler equations on a periodic domain. The global existence and uniqueness of classical solutions are obtained when the initial data is near an equilibrium. Furthermore, the exponential convergence rates of the pressure and velocity are also proved by delicate energy methods.     

GLOBAL EXISTENCE AND ASYMPTOTIC BEHAVIOR FOR THE 3D COMPRESSIBLE NON–ISENTROPIC EULER EQUATIONS WITH DAMPING

We investigate the global existence and asymptotic behavior of classical solutions for the 3D compressible non-isentropic damped Euler equations on a periodic domain. The global existence and uniqueness of classical solutions are obtained when the initial data is near an equilibrium. Furthermore, the exponential convergence rates of the pressure and velocity are also proved by delicate energy methods.     

The asymptotic behaviour of the unique solution for the singular Lane-Emden-Fowler equation

By Karamata regular variation theory and constructing comparison functions, we show the exact asymptotic behaviour of the unique classical solution near the boundary to a singular Dirichlet problem −Δu=k(x)g(u), u>0, x∈Ω, u_|∂Ω=0, where Ω is a bounded domain with smooth boundary in RN; g∈C¹((0,∞),(0,∞)), , for each ξ>0, for some γ>0; and for some α∈(0,1), is nonnegative on Ω, which is also singular near the boundary.     

Nonradial solutions of a nonhomogeneous semilinear elliptic problem with linear growth

In this paper we consider the problem

     

具奇异边界条件的一类拟线性椭圆型方程

得到了一类拟线性椭圆型方程爆破解的存在性。     

一类奇异半线性椭圆型方程的Dirichlet问题

得到了一类奇异半线性椭圆型方程 Ｄｉｒｉｃｈｌｅｔ问题解的存在性．     

Asymptotic behavior of positive solutions of semilinear elliptic equations in ℝ n , II

In this paper, we will analyze further to obtain a finer asymptotic behavior of positive solutions of semilinear elliptic equations in R^n by employing the Li＇s method of energy function.     

四阶半线性椭圆型积分微分方程的奇摄动

本文研究了一个四阶椭圆型积分微分方程的奇摄动问题。证明了相应的比较定理并得到了解的一致有效的渐近展开式。