Excitation cross sections for a vanadium atom

Moscow Power Engineering Institute, 14 Krasnokazarmennaya Str., Moscow, 105835, Russia. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 6, pp. 16–21, November–December, 1995.     

Null Space Algorithm and Spanning Trees in Solving Darcy's Equation

A Null Space algorithm is considered to solve the augmented system produced by the mixed finite element approximation of Darcy's Law. The method is based on the combination of a LU factorization technique for sparse matrices with an iterative Krylov solver. The computational efficiency of the method relies on the use of spanning trees to compute the LU factorization without fill-in and on a suitable stopping criterion for the iterative solver. We experimentally investigate its performance on a realistic set of selected application problems.This revised version was published online in October 2005 with corrections to the Cover Date.     

电磁分析软件中的混合编程和后处理技术

提出了将混合编程技术、多线程技术以及OpenGL图形编程应用到电磁场软件工程中。结果表明采用多线程技术和混合编程技术可以实现软件核心计算程序和用户界面的完美结合，利用OpenGL强大的图形处理功能，可以方便地做出电磁场工程软件所需要的容易控制的高品质的3D图形。本文以计算飞行器上天线的三维立体方向图软件为例给出了具体实现方法，而且本文方法易于应用到其他的电磁分析软件中，有助于推动电磁分析软件的国产化。     

The effect of two-photon absorption and optical excitation area on the generation of THz radiation

It was found experimentally that the THz radiation throughput based on optical rectification is strongly related to the optical excitation size in a ZeTe emitter. The factors affecting the THz radiation throughput are investigated in detail both experimentally and theoretically. By taking into account optical rectification, diffraction and two-photon absorption effects, a theoretical model is established to describe the emitting field intensity of THz radiation. There is excellent agreement between the theoretical results and the experimental data under high excitation power. Both theoretical and experimental results demonstrate that there is a trade-off between these three effects for THz radiation, and that in order to increase the THz radiation throughput based on optical rectification, one should choose suitable excitation size under a given pump power.     

带临界指数的非线性椭圆型方程混合边值向题多解的存在性

本文讨论了有界区域上带临界指数的非线性椭圆型方程混合边值问题二对非平凡解的存在性，给出了存在二对非平凡解的条件.     

Cs~（2＋）F~－离子准分子的相对论电子束激励

由高能电子束激发成功地观测到来自内壳层电离态Ｃｓ２＋Ｆ－（与ＸｅＦ具有等电子序的结构）的两个离子准分子发射带。其中心在１８５ｎｍ的强发射带被标记为来自Ｃｓ２＋Ｆ－离子准分子的Ｂ－Ｘ带束缚一自由跃迁．１５２ｎｍ附近的发射带是来自于Ｃｓ２＋Ｆ－的Ｄ—Ｘ带连续辐射。     

Numerical study of the HP version of mixed discontinuous finite element methods for reaction‐diffusion problems: The 1D case

This article studies the stability and convergence of the hp version of the three families of mixed discontinuous finite element (MDFE) methods for the numerical solution of reaction‐diffusion problems. The focus of this article is on these problems for one space dimension. Error estimates are obtained explicitly in the grid size h, the polynomial degree p, and the solution regularity; arbitrary space grids and polynomial degree are allowed. These estimates are asymptotically optimal in both h and p for some of these methods. Extensive numerical results to show convergence rates in h and p of the MDFE methods are presented. Theoretical and numerical comparisons between the three families of MDFE methods are described. © 2003 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 19: 525–553, 2003