用多极理论计算复杂截面的电缆电导

将多极理论用于复杂截面的电缆电导计算，为电缆电导计算提供一种新的计算方法。实例计算结果表明，多极理论的计算精度比边界元法的计算精度高得多。     

网格划分对四周切向煤粉炉流场计算的影响

通过选用不同的网格划分方法，对四周切向煤粉炉流场进行数值计算，若选用常规的网格划分方法计算，虚假扩散的影响非常严重，势必造成计算结果较大的偏差，同时，给出适当的网格划分，以及相应合理的计算结果。     

耦合AMR的GEL算法

数值模拟中，欧拉方法能计算大变形流场，但不能精确地区分物质界面，拉氏方法的单元边界即为物质边界，因此可以精确区分不同的物质，但当计算单元变形较大时计算精度变差甚至无法进行。如果在流场内不同区域采用不同的计算方法，在计算区域交界处进行合理的数据交换，则既能计算大变形流场又能在流场内保持清晰的物质界面。     

计算物理国家级重点实验室简介

计算物理国家级重点实验室是国家投资建设的科技重点实验室，１９９２年成立并对外开放，它的承建单位是北京应用物理与计算数学研究所．计算物理国家级重点实验室主要从事计算物理、计算力学和计算数学的基础性研究．众所皆知，在近代科学中，科学计算已成为与理论研究、...     

基于FICP算法提高对低频噪声时延的估计精度

针对非平稳随机噪声（直升机飞行声音，导弹喷流噪声）信号，研究了提高时延估计计算精度的方法，通过计算信号的细化频谱，并避免了标准FFT计算带来的栅栏效应，从而使得对于超短取样信号的频谱计算精度与信号长度无关，采用快速计算方法FICP由N点互谱计算2N点相关波形，提高了相关波形的分辨率，使得时延估计精度得以提高。对实测直升机飞行噪声和导弹噪声计算了不同取样长度和不同采样率下的时延估计，得出了谱分辨率越高，时延估计精度越高的结论。     

利用拉格朗日第二类方程求正交曲线坐标系下的加速度

在正交曲线坐标系下计算加速度，因为涉及变矢量的求导问题，一般计算比较复杂．即使用张量方法计算也不简单．本文从第二类拉格朗日方程出发，推出了一个计算正交曲线坐标系下求加速度的公式．用此法计算便捷，出错的可能性减小．     

纯几何光线追迹的数值并行计算

二维光线追迹传输是光学传输工程模拟中的一个典型的数值计算问题，其计算非常复杂，随着离散化程度的增加，计算量也将极大地增加。考虑到更加复杂的全物理光线追迹模型传输结构和升级为三维光线追迹问题，其计算量更加庞大，计算时间更会剧增无疑，对此程序设计并行程序很有实际意义。     

旋流排气管的一维非定常流动计算

动力机械装置中广泛存在着非定常旋流流动现象．本文根据质量、动量、能量和旋流动量矩守恒方程，建立了管内非定常旋流流动的一维计算模型，并应用特征线方法推导出了其数值计算格式，是管内非定常一维流动计算的扩展．应用于一台四缸涡轮增压柴油机旋流排气管的计算，通过与实测压力波的比较，表明计算模型有较好的计算精度．     

MODTRAN软件集成环境开发

MODTRAN是目前流行的红外辐射传输计算模型。应用FORTRAN语言编写的MODTRAN源代码，集成MODRAN计算软件，设计了MODTRAN软件图形界面。针对FORTRAN语言计算效率高而图形功能弱,Visual Basic (VB) 计算效率低而图形功能强的特点，用VB 和FORTRAN 2种语言混合编程，实现FORTRAN 计算程序资源的再利用。将FORTRAN 程序转化为动态链接库函数，通过函数参数传递使VB程序和FORTRAN动态链接库函数之间交换数据，将FORTRAN的计算结果在VB窗体上显示并进行作图处理，从而实现MODTRAN计算程序的图形界面及计算结果的可视化。设计出MODTRAN的汉化使用界面，有利于MODTRAN在国内推广应用。     

球坐标系中矢量的微分

在球坐标（ｒ，θ，）中计算矢量的变化率，例如计算质点的加速度，需要先计算基底矢量ｅｒ，ｅθ，ｅ的微分ｄｅｒ ，ｄｅθ，ｄｅ，本文给出这三个微分．     

Rates of Convergence in the CLT¶for Two-Dimensional Dispersive Billiards

We consider billiards in the two-dimensional torus with convex obstacles. Central Limit Theorems have been established for regular functions for the billiard transformation in [2], [1] and [14]. We are interested here in the problem of the rate of convergence. In this paper, we establish a rate in (for any α > 0) for the billiard transformation, by adapting the proof of [7, 6, 8]. In our proof, we use a strong decorrelation result obtained by the method developped in [14] for the study of general hyperbolic systems. Moreover, we establish a rate of convergence in in the Central Limit Theorem for the billiard flow. Received: 23 April 2001 / Accepted: 3 August 2001     

Solution of the thermoelastoplastic problem for a thin disk of plastically compressible material subjected to thermal loading

Elastoplastic solutions for thin plates and disks are sensitive to loading and plasticity conditions [1–5]. The plasticity condition for a number of metal materials depends on the mean stress [6–8]. In this case, when using the associated flow rule, plastic deformations do not satisfy the incompressibility condition, which is commonly accepted in statements of boundary-value problems for thin elastoplastic plates and disks [9–13]. It is of interest to determine the effect of plastic compressibility on the behavior of solutions for such structures. In this paper, a hollow disk in a rigid container subjected to a uniform temperature field is considered. The plasticity condition proposed in [14] is accepted. A general study of the set of equations including this plasticity condition and the associated flow rule was performed in [15]. The solution under the Mises plasticity condition was obtained in [1].     

On the cutoff parameter in the translation-invariant theory of the strong coupling polaron (response to comments [8] on the paper V.D. Lakhno,SSC 152 (2012) 621)

The paper is a reply to the arguments adduced by the authors of [8] against the results obtained by the author in [6], [7]. It is shown that these arguments are based on the erroneous approach made in [8] to the strong coupling limit when the cutoff parameter is introduced in the theory.     

Calculation of equilibrium deformations of nuclei with the use of single-particle infinite potentials

Calculation of equilibrium deformations of light nuclei and rare-earth nuclei is carried out by a method suggested in [1]. For light nuclei an anisotropic oscillator potential is used, while for the rare-earth domain we employ Nilsson's potential [2]. An isospin dependence of the oscillator frequencies is employed. The results agree qualitatively with calculations made according to Strutinsky's method [3].Translated from Izvestiya VUZ. Fizika, No. 6, pp. 43–47, June, 1973.     

The radiation damping terms in Synge's equations of motion

Synge's [4] approximation method is developed to include the lowest-order radiation terms in the equations of motion. The method applies to systems which have been stationary at some finite time in the past, this restriction being necessary in order to ensure convergence of the integrals occurring in the higher orders of approximation. The results obtained are then compared with those of Chandrasekhar and Esposito [7] and of Anderson and Decanio [8].     

A Solver for Helmholtz System Generated by the Discretization of Wave Shape Functions

An interesting discretization method for Helmholtz equations was introduced in B. Després [1]. This method is based on the ultra weak variational formulation (UWVF) and the wave shape functions, which are exact solutions of the governing Helmholtz equation. In this paper we are concerned with fast solver for the system generated by the method in [1]. We propose a new preconditioner for such system, which can be viewed as a combination between a coarse solver and the block diagonal preconditioner introduced in [13]. In our numerical experiments, this preconditioner is applied to solve both two-dimensional and three-dimensional Helmholtz equations, and the numerical results illustrate that the new preconditioner is much more efficient than the original block diagonal preconditioner.     

Application of Rapid Scanning Spectrometry to Atomic Spectroanalytical Analysis

Abstract

Determinations of metal content by single element atomic spectroscopy are well-established procedures in analytical laboratories. However, there has been considerable interest in methods for simultaneous multielement determinations as indicated by a recent review [1]. Correspondingly, much effort has been devoted to the development of detectors for multielement systems [2–8]. This review will report the application of rapid scanning spectrometers (RSS) to atomic spectroanalytical analysis. An instrument of this type can scan a selected wavelength window or region on a time scale ranging from a few microseconds to several seconds [4]. The scope of this review will be limited to RSS employing a mechanical means of rapid scanning, although much attention has been directed toward imaging devices such as the Vidicon tube and photodiode arrays [6–8]. The optical characteristics of the spectrometers, as well as the analytical results, will be discussed.     

The Kepler Problem with Allowance for Modification of the Gravitational Potential in the Expanding Universe with a Collisionless Gas

The paper deals with the solution to the Kepler problem for the gravitational potential of a point mass with allowance for the presence of collisionless particles in the Universe [3]. The estimates are reported for the Solar System planets and for the Sqr A object which is assumed to be a supermassive black hole at the center of the Milky Way [1]. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 26–28, August, 2005.     

Discussion notes on “Universality in the dependence of the drop contact angle on liquid-solid interactions and temperature obtained by the density functional theory”, by G.O. Berim &; E. Ruckenstein

Comments are provided for [8].     

Room Temperature Phosphorimetry as a New Spectrochemical Method of Analysis

Abstract

Luminescence spectroscopy has been extensively applied in the fields of clinical chemistry, biochemistry, and environmental chemistry. Proteins, nucleic acids, enzymes, drugs, and pollutants all show characteristic luminescence properties. The unexcelled sensitivity, selectivity, ease of sampling, and breadth of application of this method is of considerable interest to every analytical researcher and analyst. Whereas fluorimetry has become a well-established method for analysis [11, phosphorimetry has been used during the past decade only for a limited number of quantitative analyses, including the analysis of poly-nuclear aromatic compounds [2–41, coal tar fractions [5], air pollutants [6-8], impurities in petroleum fractions [9–111, detection of pesticides, and fungicides in foods [12–17], and the analysis of amino acids and pharmaceutical compounds in biological fluids [18–26]. Only recently has phosphorimetry been extensively developed into a practical qualitative and quantitative analytical method. Several papers have appeared in which the progress in instrumentation and methodology as well as the analytical uses of phosphorimetry were given [27–30]. In the 1960s the lack of use of phosphorimetry for quantitative analysis was primarily due to the great complexity and time needed to prepare and carry out an analysis at low temperature, and the poor precision and accuracy of measurements of snowed, opaque, or cracked inhomogeneous samples. In the early 1970s, improvements were achieved with techniques to enable the measurement of opaque matrices of organic solvents [31] and the development of time-resolved and phase-resolved phosphorimetry [32-361. However, in most phosphorimetric studies, the analysis still had to be performed using either low temperature rigid solvents of organic glasses, polymer matrices, or carefully degassed and purified solutions in order to minimize collisional triplet quenching. These requirements still are the main disadvantages which make this spectro-chemical method less-widely used than fluorimetry. Recently, the observed phenomenon of intense phosphorescence at room temperature (RTP) from ionic organic compounds adsorbed on a variety of supports, such as silica, alumina, paper, and asbestos [36, 37], has been proposed as a new analytical technique [38–42]. A large variety of ionic compounds of biological and clinical interest [38-40] has been investigated by this new method. The use of external heavy atom perturbers has also been investigated for the determination of trace nonionic compounds, such as the polyaromatic hydrocarbons [41]. Significant progress has been achieved with the development of a simple device for automated RTP measurement [42].