左Clifford双半环的性质与结构

定义了双半环的分配格和带双半环。利用这两个定义以及左Clifford半群的性质,给出了左双环和左Clifford双半环的定义,并得到了双半环是左双环的充分必要条件和双半环是左Clifford双半环的充分必要条件。     

Decoration of disclinations by solidification-induced band texture and focal-conic texture for a low-molar-mass liquid crystal

Two decoration techniques, solidification-induced band texture decora tion and focal-conictexture decoration, have been established to exhibit the director field of disclinations in a low-molar-mass methacrylate liquid crystal. The disclinations with strength s = 1/2 and s = ±1 are observed by the two decor ation methods. For the solidification-induced band texture decoration, the molecular orientation is perpendicular to the direction of the band. While for focal- conictexture decoration, it has been proved by the results of IR dichroism that the direction of the director is parallel to the direction of the focal-conic. Therefore, the sketch map of the molecular director filed can be mapped according to the morphological pattern of the solidification-induced band textureor focal-conic texture.     

E-n-伪矩形性拟正则半群

本文是在[1]的基础上,将半群s的幂等元集E(S)由埋想推广为n-伪理想,然后来给出S的结构。本文未用到格林关系,因而证明有别于[1],而且[1]是我们的特例。     

带的双闭子带和自由幂等元半环

给出带的双闭子带和它的性质及特征。在此基础上，给出加法半群为半格的幂等元半环簇中的自由对象。     

无缝线路缓冲区病害分析及根治措施

概述了缓冲区养护中存在的问题,分析了无缝线路缓冲区病害的成因,提出了治理病害的针对性措施.     

Au吸附在GaAs（110表面的研究

研究了Au吸附在GaAs(110)表面的吸附构型,并计算了表面态密度和表面能带结构.计算结果表明,可以认定Au与Ga的悬挂键杂化成键,从而引起2条附加的能带,一条位于禁带之中,距价带顶为0.9ev;另一条与价带共振,离价带顶为0.7ev,所得结果与实验结果相一致.     

基于反相对称法的双边带通信系统

给出了一种基于反相对称法的双边带通信系统的实现方法,通过MATLAB仿真,证实了这种方法的可行性。     

Time‐simultaneous prediction band for a time series

I propose principles and methods for the construction of a time‐simultaneous prediction band for a univariate time series. The methods are entirely based on a learning sample of time trajectories, and make no parametric assumption about its distribution. Hence, the methods are general and widely applicable. The expected coverage probability of a band can be estimated by a bootstrap procedure. The estimate is likely to be less than the nominal level. Expected lack of coverage can be compensated for by increasing the coverage in the learning sample. Applications to simulated and empirical data illustrate the methods. Copyright © 2007 John Wiley & Sons, Ltd.     

单片机－CRT接口板设计

详细阐述了单片机－ＣＲＴ接口板的设计原理，增强了单片机的显示手段，拓宽了单片机在生产过程监测系统中的应用。     

Genetic algorithm-based wide-band deterministic maximum likelihood direction finding algorithm

1 .INTRODUCTIONThe problemof esti mating direction of arriving waveusing array signal processing has wide applications inradar ,sonar ,seismology,astronomy and mobile andsatellite communication system, and has receivedmuch attentionin recent years .But the current liter-ature about direction finding algorithmpays more at-tention to narrow-band signal ,that is to say band-width of signal is far smaller than center frequency ofsignal and so envelop of signal keeps invariant in thesensors of …