On adhesive energies at bimetallic interfaces

The adhesive energies between densely packed planes of simple metal slabs are calculated as a function of separation. The assumed simple form of the electron density profile makes the calculation semianalytical and simple. Due to the improved treatment of the kinetic energy functional through the inclusion of the fourth-order density gradients, the results are in reasonable agreement with the results of self-consistent calculations and experiment.     

Existence of a dense orbit and topological transitivity: When are they equivalent?

Topological transitivity and existence of a dense orbit are two notions which play an important role in every definition of chaos [2], [4]. Unfortunately, in the literature there are often misunderstandings (or even false statements) about their relationship. In this note we show that generally neither condition implies the other and then we give two propositions (Propositions1 and 2) for implication in either direction. This revised version was published online in June 2006 with corrections to the Cover Date.     

On the preparation of synthetic carbon adsorbents using the sulfonated ion exchange resin duolite C-20

Thermal analysis was used to study thermal behavior of the sulfonated ion exchange resin Duolite C20 in the hydrogen, sodium and calcium forms. The aim of this paper was to prepare spherical carbon adsorbents. SEM and AFM microscopic methods have been applied to describe their surface characteristics. It was stated that structural parameters of prepared active carbons depend on the kind of cation present in the resin. The use of calcium form of Duolite C20 as the initial polymer precursor allowed to obtain the active carbon with better yield and better developed pore structure compared with other forms of this ion exchanger.     

机敏结构状态监测的光纤传感阵列及信号处理方法

本文在分析一般光纤微弯力传感原理与结构基础之上,提出了一种适用于机敏结构准分布力监测的光纤传感阵列的原理与构成以及其信号的神经网络处理方法。给出了传感阵列与系统的结构、神经网络模型及初步实验的结果。表明其传感与处理结构简单、灵活,在机敏结构损伤估计中有广泛的应用前景。     

强p除环上方阵的酉相似理论(Ⅲ)

In this third paper, the famous Schur theorem that an n× n complex matrix is unitary similar to an upper triangular matrix is generalized to the socalled ∑-lizable matrix over the strong p-division ring Ω, where ∑ is the algebraically closed extension field of the center of Ω , and ∑?Ω.The generalized Schur's identity and other results involving the general-ized normal matrix over Ω is obtained by using this generalized Schur theorem.     

Quartic B‐spline collocation algorithms for numerical solution of the RLW equation

The collocation method based on quartic B‐spline interpolation is studied for numerical solution of the regularized long wave (RLW) equation. The time‐split RLW equation is also solved with the quartic B‐spline collocation method. Numerical accuracy is tested by obtaining the single solitary wave solution. Then, interaction, undulation and evolution of solitary waves are studied. Solutions are compared with available results. Conservation quantities are computed for all test experiments. © 2007 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 2007     

Groupoid cohomology and extensions

We show that Haefliger's cohomology for étale groupoids, Moore's cohomology for locally compact groups and the Brauer group of a locally compact groupoid are all particular cases of sheaf (or Cech) cohomology for topological simplicial spaces.