نتایج جستجو برای: singular periodic solution

تعداد نتایج: 588673  

2008
JONATHAN A. SHERRATT

Periodic travelling waves are an important solution form in oscillatory reaction–diffusion equations. I have shown previously that such waves arise naturally near a boundary at which a Dirichlet condition is applied. This result has applications in ecology, providing a potential explanation for the periodic waves seen in a number of natural populations. However, in ecological applications the D...

2000
Pedro J. Torres

We "nd conditions for the existence of an elliptic periodic solution of a singular equation that governs the motion of a magnetically focused axially symmetric electron beam with Brillouin #ow by using a monotone iterative scheme starting from a couple of upper and lower solutions on the reversed order. Also, a uniqueness result is proved by using Brouwer degree and index of solutions. Copyrigh...

2008
Michael J. Gruber

Fermi surfaces are basic objects in solid state physics and in the spectral theory of periodic operators. We define several measures connected to Fermi surfaces and study their measure theoretic properties. From this we get absence of singular continuous spectrum and of singular continuous components in the density of states for symmetric periodic elliptic differential operators acting on vecto...

1999
Michael J. Gruber

Fermi surfaces are basic objects in solid state physics and in the spectral theory of periodic operators. We deene several measures connected to Fermi surfaces and study their measure theoretic properties. From this we get absence of singular continuous spectrum and of singular continuous components in the density of states for symmetric periodic elliptic diierential operators acting on vector ...

Journal: :bulletin of the iranian mathematical society 2015
f. wang s. sun

using the fixed point theorem in a‎ ‎cone‎, ‎the existence and multiplicity of radial convex solutions of‎ ‎singular system of monge-amp`{e}re equations are established‎.‎

Journal: :international journal of civil engineering 0
h. rahami university of tehran a. kaveh iran university of science and technology m. ardalan asl university of tehran s. r. mirghaderi university of tehran

in the process of structural analysis we often come to structures that can be analyzed with simpler methods than the standard approaches. for these structures, known as regular structures, the matrices involved are in canonical forms and their eigen-solution can be performed in a simple manner. however, by adding or removing some elements or nodes, such methods cannot be utilized. here, an effi...

Journal: :bulletin of the iranian mathematical society 0
f. wang depatment of mathematics‎, ‎college of science‎, ‎hohai university‎, ‎nanjing 210098‎, ‎china s. sun depatment of mathematics‎, ‎college of science‎, ‎hohai university‎, ‎nanjing 210098‎, ‎china

using the fixed point theorem in a‎ ‎cone‎, ‎the existence and multiplicity of radial convex solutions of‎ ‎singular system of monge-amp`{e}re equations are established‎.‎

2006
Yaroslav Vorobets

Let M be a compact connected oriented surface. The surface M is called a translation surface if it is equipped with a translation structure, that is, an atlas of charts such that all transition functions are translations in R2. It is assumed that the chart domains cover all surface M except for finitely many points called singular. The translation structure induces the structure of a smooth man...

2017
Jian-Guo Liu Jianfeng Lu Dionisios Margetis Jeremy L. Marzuola

In the absence of external material deposition, crystal surfaces usually relax to become flat by decreasing their free energy. We study an asymmetry in the relaxation of macroscopic plateaus, facets, of a periodic surface corrugation in 1+1 dimensions via a continuum model below the roughening transition temperature. The model invokes a highly degenerate parabolic partial differential equation ...

2002
CARMEN COLL

In this paper, {α, k}-group periodic matrices are introduced and analyzed. Using different approach (as {1}-inverses, Moore-Penrose inverse, elementary matrices, left and right inverses and singular value decomposition) we characterize this kind of matrices. Some results presented are an extension of those known about group inverse and group periodic matrices. Key–Words:Generalized inverse, gro...

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