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This article is divided into three parts:I: It gives the relevant background knowledge, mainly about the study of circulant matrices at home and abroad, the basic concepts, characteristics of circulant matrices, and the basic computing instruments which have been frequently used in matrix theory and matrix calculations.

本文共分三个部分：一：给出相关的预备知识，主要是循环矩阵研究的国内外现状和进展、文中用到的循环矩阵的基本概念、性质以及在矩阵理论和矩阵计算中经常用到基本运算工具。

This article gives five new methods of proving acceleration of circular motion.

本文给出了5种区别于现行大学物理教材的求证圆周运动加速度的新方法。

This feature gives a reasonable explanation for the mechanism of CAS. The phase velocity of diffraction fields for uniform plane wave on a circular aperture has been investigated. It is shown that diffraction can result in subluminous phase velocity at certain points of optical field in vacuum.

如果相对论电子能够注入到这一通道内，那么它与激光场间的相移就可能变得非常小，从而能够长时间地保持在加速相中得到极高能量。

Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了频率对井下电磁波传输特性的影响，采用金属波导法分析了圆形、拱形及弯曲隧道中电磁波的传输特性并给出衰减率近似公式，得出主要结论：在圆形和拱形隧道中，频率越高，衰减率越小，越有利于电磁波的传播；在弯曲隧道中，频率越高，衰减率越大，不利于电磁波的传播；通过特性曲线与井下实验数据相比较得出在900MHz左右为井下无线通信系统传输信号最佳频段。

Why, because be hair sheet likewise, but some classmates are met only Mu Ne's station gives a person mechanically circularize on the road in the street, and my criterion is ceaseless smile, of meet unexpectedly daughter cry: The belle looks breath out.

为什么呢，因为同样是发单，但有些同学只会木讷的站在街道上机械地给人递传单，而我则是不停的微笑，碰见女的就叫：美女看哈啊。

The end of article then gives the main function of this system circulate interface diagram.

文章的最后则给出了本系统的主要功能运行界面图。

This paper establishes a mathematical model of the gas flow field inside separating column of the circumfluent circulation cyclone separator based on the N-S equation under column coordinate,gives the resolution of the cyclone flow field in separating column with weighted residual method,and compares computation values with trial values as well.

由柱坐标系下的Navier-Stokes方程出发，建立了环流循环除尘系统分离柱内流速场新的数学模型，利用具有成熟使用经验的加权残值法对流场进行求解，并与实验结果进行了比较。

A lot of nets swim the company has circumjacent product, but the half gives outside package company goes doing.

很多网游公司都有周边产品，但一半都交给外包公司去做。

Nowadays, it is not circumscribed to communication but rather it gives all sorts of entertainment.

如今，这不是限制通信而是让各种娱乐。

The emergence of adaptive object model gives a way to develop dynamic and configurable adaptive software.But the model is not a generic framework.In practice,meta-model should be built circumstantially.

自适应对象模型的产生，为开发动态的和可配置的自适应软件提供了一种有效途径，但它本身不是一个通用的框架，在实际应用中必须根据现实情况建立元模型。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。