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首页> 外文期刊>Discrete and continuous dynamical systems >HOMOGENIZATION OF A ONE-DIMENSIONAL SPECTRAL PROBLEM FOR A SINGULARLY PERTURBED ELLIPTIC OPERATOR WITH NEUMANN BOUNDARY CONDITIONS
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HOMOGENIZATION OF A ONE-DIMENSIONAL SPECTRAL PROBLEM FOR A SINGULARLY PERTURBED ELLIPTIC OPERATOR WITH NEUMANN BOUNDARY CONDITIONS

机译:具有Neumann边界条件的奇摄动椭圆算子的一维谱问题的齐化

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摘要

We study the asymptotic behavior of the first eigenvalue and eigen-function of a one-dimensional periodic elliptic operator with Neumann boundary conditions. The second order elliptic equation is not self-adjoint and is singularly perturbed since, denoting by ε the period, each derivative is scaled by an s factor. The main difficulty is that the domain size is not an integer multiple of the period. More precisely, for a domain of size 1 and a given fractional part 0 ≤ δ < 1, we consider a sequence of periods ∈_n = 1/(n +δ) with n ∈ N. In other words, the domain contains n entire periodic cells and a fraction S of a cell cut by the domain boundary. According to the value of the fractional part 8, different asymptotic behaviors are possible: in some cases an homogenized limit is obtained, while in other cases the first eigenfunction is exponentially localized at one of the extreme points of the domain.
机译:我们研究具有Neumann边界条件的一维周期椭圆算子的第一特征值和特征函数的渐近行为。二阶椭圆方程不是自伴的,而是奇异的,因为用ε表示周期,每个导数都用s因子缩放。主要困难在于域大小不是周期的整数倍。更精确地,对于大小为1且给定的分数部分0≤δ<1的域,我们考虑周期∈_n= 1 /(n +δ)且n∈N的序列。换句话说,该域包含n个整数周期单元和被域边界切割的单元的分数S。根据小数部分8的值,可能会出现不同的渐近行为:在某些情况下,获得了均化的极限,而在其他情况下,第一个本征函数按指数形式位于该域的一个极端点。

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