Alpha稳定分布的参数表征及仿真

仿真服从标准参数系下任意参数的Alpha稳定分布(αS)随机变量是开展相关信号处理研究的基础。服从对称Alpha稳定分布(SαS)的随机变量较易生成,而产生服从αS分布随机变量较为困难,一个重要的因素是存在易于混淆的不同参数表征。本文在讨论Alpha稳定分布概念、性质的基础上,讨论了三种主要参数系,提出并证明了正确的产生服从αS分布随机变量的变换公式及仿真方法,并通过Monte-carlo仿真比较了三种参数系表征的αS分布的概率密度函数的差异。对Pearson海杂波的仿真表明了该方法的有效性,而Chambers方法存在分布位置的偏差。     

组合群论中的一个定理

Let F= F(X) be a free group of rand n, A be a finite subset of F(X) and x∈X be a generator. The theorem states that x can be denoted as a rotation-inserting word of A if x is in the normal closure of A in F(X). Finally, an application of the theorem in Heegaard splitting of 3manifolds is given.     

二十面体群C-G系数计算

本文简要介绍了计算Ｃ Ｇ系数的生群元矩阵方程法，给出计算二十面体群Ｃ Ｇ系数时采用的简化计算方法，并给出了Ⅰ群Ｃ Ｇ系数的计算结果。     

On goodness-of-fit tests for multiple recursive random number generators

This paper considers the problem of reducing the computational time in testing uniformity for a full period multiple recursive generator (MRG). If a sequence of random numbers generated by a MRG is divided into even number of segments, say 2s, then the multinomial goodness-of-fit tests and the empirical distribution function goodness-of-fit tests calculated from the ith segment are the same as those of the (s + i)th segment. The equivalence properties of the goodness-of-fit test statistics for a MRG and its associated reverse and additive inverse MRGs are also discussed.     

Multipoint parallel excitation and CCD-based imaging system for high-throughput fluorescence detection of biochip micro-arrays

We report the development and the characterization of a multipoint parallel excitation and CCD-based imaging system for high-throughput fluorescence detection of biochip micro-arrays. A two-dimensional array of (19×19) points with uniform intensity distribution, generated by a holographic array generator, was used for parallel excitation of two-dimensional micro-arrays of fluorescence samples. A CCD-based imaging system was used for high-throughput parallel detection and quantitative analysis of the fluorescence output. Micro-array samples of cyanine (Cy5) dye dots on silicon wafers and on glass substrates with varying concentration were used to evaluate the performance of the system. Results of fluorescence intensity measurements with varying concentration of dye and with different image acquisition time are presented. We have demonstrated that this novel approach will, in general, outperform the conventional approach in the excitation efficiency, the signal-to-noise ratio, and the throughput. The limitations and the potential improvements of the present method are discussed.     

一类四元环上常循环码是自由码的充要条件

本文研究了环F2 uF2上的奇长度的循环码和(1 u)-循环码.运用代数方法,得到了F2 uF2上的循环码和(1 u)-循环码成为自由码的几个充要条件.推广了Bonnecaze(1999)和Aydin(2002)的关于自由码的结果.     

利用爆聚等离子体研究X光激光

对脉冲功率技术驱动的爆聚等离子体过程进行了物理分析,在5％的偏差范围内,得到了和数值计算结果相一致的近似解析公式。计算结果表明,功率在3—4TW,输出电能300—400KJ,技术指标类似PITHON的加速器可以使质量为200—400μg的Kr气爆聚压缩成高温等离子体柱。     

洋浦电厂#11-13联合循环机组高压给水系统的变频改造

着重论述了海南洋浦电厂#11-13联合循环机组锅炉高压给水系统变频改造的原由，改造方法和运行对策，供兄弟单位参考和借鉴。