传播

Based on one-dimensional Method of Characteristics, a numerical model of pressure-wave progation if presented in this paper. A special code is programmed to analyze and calculate waterhammer resulted from rapid opening or closing of valve in the experimental sodium loop of Fast Breeder Reactor.

本文利用一维特征线法，建立了压力波传播的数学模型，并编制了专用程序，利用该程序对快堆实验钠回路中由于阀门的快速开启与关闭引起的压力波的传播进行了分析计算。

The conference points out at the same time, our country will begin punish mobile phone transmits bawdy pornography behavior, transmit punish mobile phone bawdy pornography to bring into special operation.

会议同时指出，我国将着手整治手机传播淫秽色情行为，并将整治手机传播淫秽色情纳入专项行动。

It is a modern name given to the deadly bubonic, an epidemic disease caused by rat fleas.

黑死病是现代名称，是指老鼠身上的跳蚤传播的致命的淋巴腺鼠疫引起的传播性疾病。

The transmission value of rich guest is very high, but the value of this kind of transmission does not depend on advertisement, more it is rich advocate the action that regards an opinion as cacique.

博客的传播价值很高，但这种传播的价值不在于广告，更多的是博主作为意见领袖的作用。

Wang Xiaofeng thinks, the transmission value of rich guest is very high, but the value of this kind of transmission does not depend on advertisement, more it is rich advocate the action that regards an opinion as cacique.

王小峰认为，博客的传播价值很高，但这种传播的价值不在于广告，更多的是博主作为意见领袖的作用。

Aiming at enterprises' crisis emerging in endlessly in Network-Communication surroundings, and crisis advance and degenerate frequently for Network-Communication, we study the forewarning-management on enterprises' crisis in Network-Communication surroundings and put forward forewarning-management thought and design forewarning-management system for enterprises' crisis from function, acting content, operating-mode, and put forward the solution to carry the forewarning-management into effect in this paper.

摘要针对网络传播环境下企业危机层出不穷的现状，提出了网络传播环境下的企业危机预警管理思想，并从功能、活动内容和运行模式上设计了企业危机预警管理系统，最后从系统建设、制度与流程设计以及保障体系建立3个方面对危机预警管理的实现提出了解决方案。

At the same time, combining with the actual condition of delivery pipeline of our country and some prevalent leak detection and location methods, this paper raised a method, which is based on wavelet analysis and negative- pressure-wave to detect and locate the leakage. Jobs in the paper are as follows:As affected by gas density, pressure, specific heat and pipe material, the velocity of negative-pressure-wave improved depending on the energy conservation. At one time, taking the affection of velocity of gas flow, the location formula was modified in some degree.When locating the leaks with location formula, the iterative approach algorithm was adopted as a new method to increase the location accuracy level of system.Multi-scale decomposition and reconstruction of wavelet transform is utilized to filter the noise of negative-pressure-wave, which was brought by leakage. With the capacity to detect the signal singularity fast and accurately, wavelet transform was used to catch the break point of pressure signal. The work improved the accuracy of At in location formula, accordingly improved the location accuracy.Wavelet is a suitable tool for signal analysis. The distinct character is that the mother-wavelet is of optional. That means choosing different mother-wavelet will get different analysis result. So we studied how to choose mother-wavelet and its scale for signal singularity detection. The method is to choose a wavelet by regularities of the wavelet and the signal.Finally, a plan, which bases on SCADA system for inspection and detection of natural gas leakage, is proposed in the article.

其中，主要进行了以下几方面的工作：针对泄漏产生的负压波在管道中的传播速度受媒介的密度、压力、比热及材质等因素的影响，而非声波在空气中传播的速度，本文利用能量守恒原理，对其进行了修正；考虑到管内气体流速对压力波速的影响，对原始的负压波定位公式进行了一定程度的改进，并在利用定位公式进行泄漏点定位时采用逐步迭代逼近算法，提高了系统的定位精度；利用小波变换的多分辨率分解和重构技术，对采集到的管道发生泄漏时产生的负压波信号进行了降噪处理；并利用小波变换技术对信号奇异点的快速、准确的识别能力，对经上述消噪后的负压波信号进行了奇异点捕捉，精确捕捉的结果提高了定位公式中上下游站点采集到的负压波奇异点的时间差△t的精度，从而进一步提高了定位的精度；考虑到小波变换是一种基波可变的信号分析工具，也就是说，不同的小波基波对信号分析的结果将有很大差别，这势必影响最终的处理结果，因此，我们又对比分析了本课题中小波基及尺度的选择问题，依据规则性系数相似性原理对母小波的选择进行了探索性研究；最后，还提出了基于SCADA的泄漏检测与定位系统的软件开发构想及系统的嵌入方案。

In the time of the Tudors, English schools and universities were established to teach classical learning and humanistic ideas. William Caxton first introduced printing into England, making great contribution to spreading literature throughout the country .With the introduction of printing , an age of literary translation came into being .Many continental literary workd both ancient and modern were translated and printed in English .

都铎王朝时期，英国学校和大学建立传播古典文化和人文主义思想，威廉·卡克斯顿是第一个将印刷术引进到英国的人，并将此种文化传播到全国，随着印刷术的引进，接踵而来的是一个翻译的时代，大批欧洲大陆的文学作品，不论是古代的还是当代的，都被翻译并印刷成英文。

This is formed by the cracks oscillating about the centerline in the direction of crack propagation.

这是由于在裂纹的传播过程中，裂纹尖端沿着传播方向的中线上下振荡所形成的。

To analysis the inevitability and chanciness reasons that cause the existentialism aesthetics develops so well. From the external object reception to object reception, probe into the reception in China about the existentialism aesthetics.

在此基础上，探究存在主义美学在中国的接受，从客观的传播接受到心理接受，从分析中国对存在主义美学的接受心理，探求存在主义美学在中国形成的传播特色及其产生的原因。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。