浅谈物理模型在解题中的应用

本文通过几个实例说明了在具体问题中建立相应物理模型的方法以及物理模型在解题中应用的重要性。     

气体放电击穿过程的物理和数值研究

本文对低气压（１０＾－２Ｐａ）热阴极气体放电的击穿过程给出了物理描述和相应的双流体数学型，并发展了一种选择和调整未知初始条件的有效算法，可以通过伴随试射法得到对初始条件十分敏感的非线性两点边值常微分方程组的数值解，从而给出这类气体放电中击穿过程的定量描述。     

Velocity spectrum for non-Markovian Brownian motion in a periodic potential

Non-Markovian Brownian motion in a periodic potential is studied by means of an electronic analogue simulator. Velocity spectra, the Fourier transforms of velocity autocorrelation functions, are obtained for three types of random force, that is, a white noise, an Ornstein—Uhlenbeck process, and a quasimonochromatic noise. The analogue results are in good agreement both with theoretical ones calculated with the use of a matrix-continued-fraction method, and with the results of digital simulations. An unexpected extra peak in the velocity spectrum is observed for Ornstein-Uhlenbeck noise with large correlation time. The peak is attributed to a slow oscillatory motion of the Brownian particle as it moves back and forth over several lattice spaces. Its relationship to an approximate Langevin equation is discussed.     

CASS工艺在生活污水处理及回用中的应用

介绍CASS工艺在生活污水处理及回用中的应用.运行结果表明,进水CODcr为150-300mg L,BOD5为80-210mg L时,SS为100-220mg L时,出水CODcr≤50mg L,BOD5≤10mg L时,SS≤10mg L,完全符合回用要求.     

One-Dimensional Poisson Growth Models With Random and Asymmetric Growth

Suppose there is a Poisson process of points X _i on the line. Starting at time zero, a grain begins to grow from each point X _i , growing at rate A _i to the left and rate B _i to the right, with the pairs (A _i , B _i ) being i.i.d. A grain stops growing as soon as it touches another grain. When all growth stops, the line consists of covered intervals (made up of contiguous grains) separated by gaps. We show (i) a fraction 1/e of the line remains uncovered, (ii) the fraction of covered intervals which contain exactly k grains is (k–1)/k!, (iii) the length of a covered interval containing k grains has a gamma(k–1) distribution, (iv) the distribution of the grain sizes depends only on the distribution of the total growth rate A _i +B _i , and other results. Similar theorems are obtained for growth processes on a circle; in this case we need only assume the pairs (A _i , B _i ) are exchangeable. These results extend those of Daley, et al. (2000) who studied the case where A _i =B _i =1. Simulation results are given to illustrate the various theorems.     

整体优化 提高高校学报质量

本文从学报形成的全过程入手,分析了影响学报质量的诸因素,提出了人与科学技术相结合;编者与作者相结合;编者与读者需要相结合;办刊与高校教育相结合来提高学报质量的观点,使学报在信息传播的全过程中实现整体优化。     

Some Invariance Principles for Random Vectors in the Generalized Domain of Attraction of the Multivariate Normal Law

For independent identically distributed random vectors belonging to the generalized Domain of Attraction of the multivariate normal law, we define two partial sum processes analogous to that of Donsker's Theorem. We prove that each converges in distribution to a Brownian Motion in the space of continuous functions. One process uses nonrandom operator normalization, and the other is a studentization of the first, using normalization by the empirical covariance operator.     

基于生命周期的虚拟团队管理流程

虚拟团队是一种先进有效的团队管理模式,为了研究如何构建虚拟团队,以及虚拟团队如何管理,通过对塔克曼等人“团队发展阶段模型”的分析和对影响团队效能因素的探讨,结合虚拟团队的特点构建了虚拟团队的管理流程模型,进而提出了基于权威核心的虚拟团队组织形式,并对虚拟团队生命周期的各阶段不同特征进行了具体分析,为虚拟团队的构建和管理提供了一个可行的过程框架．     

密度演化方法在求解股市上扬天数中的应用

将股市上扬的天数转化为随机游程的长度，利用密度演化方法求得了股市上扬天数的分布以及均值和方差该文首次将密度演化方法用来研究股市的一般宏观规律，其结论可指导投资决策．