The noise characteristics of DTM350 / 600 tube mill in thermal power plant were analyzed in the paper . A kind of damping coating reinforced by zinc oxide whisker used for improving the property of noise insulation was developed .

分析DTM350/600型 钢球磨煤机噪声特性，研究开发出用于提高 隔声结构、性能的氧化锌晶须增强阻尼涂料。

It can be self-compacting the forming of the tube to facilitate the construction of concrete on its own gravity and can reduce noise pollution ensure project of great significance .

自密实混凝土在浇注时无须振捣，靠自身重力便可自密实成形，对方便 管 内混凝土的施工，减轻 噪声污染，确保工程质量具有重要意义。

To install ripple metal collapsible tube on the import and export of pipeline of storage tank can compensate displacement deviation of storage tank and pipeline and can absorb vibration and reduction noise guarantee the safe operation of storage tank .

在储罐的进出口管道上设置波纹金属 软管，可补偿借罐和管道的位移及安装偏差，并能吸收振动和降低 噪音，保证储罐的安全运行。

This paper describes a new type of gas discharge tube which can be inserted horizontally into a circular waveguide as a standard noise source .

本文描述一种新型的放电 管，可以水平地插入圆波导作为标准 噪声源。

The effect that wave-guide tube has on the detection of leak noise ;

波导 管对泄漏 噪声测量的影响；

By using correlation-detection technique and improving the structure of test tube the background noise of thermionic-electrons and space charge effect are restrained .

本文利用相关检测技术，并对测试 管结构作了改进，很好地抑制了热电子本底及空间电荷效应，构成一种 测量热阴极在工作温度下次级电子发射 性能的新方法。

Areas which have the biggest vibration amplitude are the back cover the bow and the connection part of bow and axle tube . ( 4 ) Have completed the radiated noise analysis of the housing basing on the frequency response analysis .

在频率响应分析的基础上，完成了桥 壳的辐射 噪声分析。

Some measures were put forword to improve the detecting sensitivity such as choosing the photo-electricity tube with linked rectangle high frequency response low noise as detection parts and applying adjustable diaphragm multi-adjustable comparison voltage .

提出选择拼接长条形、具有高频响应、低 噪声的光电接收 管作为探测器件，采用可调光阑、多路可调比较电压、提高电路放大倍数的措施，可以提高天幕靶的探测灵敏度。

By using a return path and appropriately increasing the average Cd concentration in the laser tube the laser noise cad be remarkably reduced and a low noise and high output power He-Cd laser can be obtained .

适当增大激光 管 内平均镉浓度和采用扩散回路后，可显著降低激光 噪音，获得大功率低噪音的氦镉激光器。

The low sensibility and the high dark count rate of traditional single-photon detectors which base on photomultiplier tube or avalanche photodiode limit the improvement of the signal noise ratio and the low counting rate limits the detecting speed and the dynamic range .

传统以光电倍增 管或雪崩二极管为基础的单光子探测器的低灵敏度和高暗计数限制了信 噪比的提高，低计数率限制了测量速度和动态范围。

RESULTS : The entrance doses of the phantoms decreased square-inversely and tube current ( mAs ) used to get the images with the same ratio of signal to noise increased linearly with the increase in thickness of additional Al filtration .

结果：随着附加滤过板厚度的增加，体膜表面剂量呈平方关系下降；若获得同样的图像信 噪比，则 管电流（mAs）呈线性增加；

NSBS type tube covered with zinc plating braid Have the same effective with steel made tube on shielding the cable noise .

NSBS型号管体外覆有镀锌线网层，在屏蔽电缆产生的 噪音方面，钢制电线 管具有同等水平。

A lot of noise phenomena have been observed within the range of 0-300 khz by changing the tube structure gas pressure and discharge current of the laser . The relation between noise and moving striation is also discussed .

通过改变激光器的结构、 管 内总气压和放电电流，在0～ 300千赫范围内可以观察到许多噪声现象。

The reason of the instability of the image signal on oscilloscope in Frank-Hertz experiment with Ar-filled Frank-Hertz tube is that the output current of Frank-Hertz tube is too small and contaminated with power frequency electromagnetic signal of environment and the energy spectrum is influenced by noise .

充氩管夫兰克-赫兹实验装置的示波器显示图像不稳定，其原因是夫兰克-赫兹 管输出电流太小，受到环境中的工频电磁波的污染，以及能谱信号受到了 噪声相位的干扰。

Whether with AC or DC magnetization if the steel tube is over magnetized the signal to noise ratio will decrease .

不管是交流磁化还是直流磁化，当 钢管过磁化后，信 噪比明显降低。

Detection technology of boiler tube leakage is based on the principle : the sensor picks up the noise with a certain intensity and frequency range produced during boiler tube leakage and distinguishes leakage noise source from background noise source .

锅炉炉管泄漏检测技术是通过传感器捕捉炉 管泄漏时产生一定强度和频率范围的噪音，并区分泄漏 声源和背景声源。