声压

In this paper, the sine and cosine shaped sensors have been designed by using the integral characteristics of PVDF piezoelectric film. The sine PVDF sensor can be used alone to measure the displacement, speed, acceleration, stain, stress of the roof beam vibration; the cosine PVDF sensor can be used alone to measure the angular displacement and shear of the roof beam vibration; by using them jointly , the structural intensity can be measured for the roof beam without any finite differential error.

本文利用PVDF压电薄膜独特的积分特性，设计制作了正弦形状和余弦形状传感器，它们单独使用，正弦形状的PVDF传感器可以用来测量梁振动的位移、速度、加速度、应变、应力、弯矩；余弦形状的PVDF传感器可以测量振动梁的角位移和剪力；配对使用它们，可以用来测量梁的结构声强，用它们测量结构声强时不会产生有限差分误差。

The traditional AE characteristic parameter analysis method has been used to study the damage process of the product.

提出声发射检测技术在某型导弹的球形补压气瓶检测中的应用，找出传感器的安装布局和定位声发射源的算法，采用参数分析的方法对产品在变形损伤过程中的AE特征进行研究。

With the filling nitrogen of 0.9 MPa, the maximal pressure ratio reaches 1.21 and the operation frequency is 25 Hz. The ratio of the harmonic wave of the engine was very little and the frequency jumping was not found in present experiments.

在充气压力为0.9MPa的条件下，该热声发动机最大压比可达1.21，远高于驻波型热声发动机，实验结果和理论分析均表明系统的工作频率为25Hz左右，实验装置的谐波比例非常小，且也没发现频率跳变等现象。

The ambient noise is uniformly insulated between 125 Hz and 2000 Hz, averagely insulating sound about 22 dB, by the isolation booth, and that fits in with the spectrum and SPL of stored grain insect action sound.

实验表明，在125~2000Hz的频带范围内，隔声室能均匀隔离环境噪声，平均隔声量为22dB，可满足储粮害虫活动声的频率范围和声压级要求。

The acceleration and sound pressure on the surface of seafloor are obtained.

建立了点声源作用下海底地震波的时域数值计算模型，利用该模型，对二维半无限空间简单海洋模型的低频点声源海底地震波问题进行了数值模拟，得到了海底表面处的加速度和声压值。

Since the late eighties of the 20th century, active control of interior structure borne noise within enclosures using smart materials such as lead zirconate titanate pizeoelectric actuators, etc. has become a hot research area in the field of noise control.

二十世纪八十年代后期以来，利用压电陶瓷等智能材料进行封闭空间结构声辐射的有源消声成为噪声控制领域中的一个研究热点。

From acoustic wave equation, current continuity equation and boundary conditions, we have solved the interface potential produced by BAWs in interface between piezoelectric solid and semiconductor. The results of YZ LiNb03/n-Si structure with SV wave incidence have been calculated and experimental result has been given. Finally, we have presented some kinds of BAW acoustoelectric convolver structures and analyzed their features.

由声波动方程，边界条件和半导体的电流连续性方程出发，推导出了斜入射体波在压电体/半导体界面产生的界面电势以及通过半导体的作用产生的倍频电势的结果，并且对YZ-LiNb03/n-Si结构，SV波入射的情况进行了计算，给出了部分实验结果，提出了几种可能的体波声电卷积器的结构，并分析了它们各自的特点，理论和实验的结果将为今后这类器件的研制提供依据。

Quickly the trickle becomes a flood of glistening linseed oil as the beam sinks earthwards, taut and protesting, ist creaks blending with the squeaking and rumbling of the grinding-wheels and the occasional grunts and sighs of the camels.

很快，一滴滴油浆变成了一股闪闪发光的亚麻籽油流，其间大梁被压向地面，越来越紧，嘎嘎响，中间还夹杂着石轮的吱吱轰轰声，还有骆驼的哼唧声和喘息声。

Quickly the trickle becomes a flood of glistening linseed oil as the beam sinks earthwards, taut and protesting, its creaks blending with the squeaking and rumbling of the grinding-wheels and the occasional grunts and sighs of the camels.

随着大梁越压越低，缆索越绷越紧，大梁的嘎吱声，石磙的辘辘声，以及骆驼不时发出的咕噜咕噜的呼吸声和叹息声响成一片，榨出的油也很快地由涓滴细流变成了一股晶莹发亮、奔腾不止的洪流。

Was founded in 1998, the main distribution line agents and flake-like electronic components, has Huake, thick sound, YAGEO resistance, Howard Branch, YAGEO, Samsung, TDK's capacitor, the United States AVX and KEMET, Japan NEC tantalum capacitor, NEC, PHILIPS, MOTOROLA, long electric brand b / triode, ST and ROHM's regulator tube, TOREX, Pui Ling, Li Qi, Jing-fu, Taiwan's power supply LDO regulator IC, DC / DC step-up IC, DC / DC step-down IC, TDK, too enticed, Fenghua inductor, bead, Panasonic adjustable capacitance, an adjustable resistor, three-ying Korea and Japan's Sanyo electrolytic capacitors, and insurance management, light-emitting diodes, thermistors, varistors, the brand of integrated circuits and so on; are a professional supporting electronic components for over many years of experience supporting services.

深圳金星电子科技有限公司成立于1998年，主要代理经销直插式和片状式的电子元器件，有华科、厚声、YAGEO的电阻，华科、YAGEO、三星、TDK的电容，美国AVX和KEMET、日本NEC的钽电容， NEC 、PHILIPS、MOTOROLA、长电品牌的二/三极管，ST和ROHM的稳压管，TOREX、贝岭、立奇、富晶、台湾的LDO电源稳压IC、DC/DC升压IC，DC/DC降压IC，TDK、太诱、风华的电感、磁珠，松下的可调电容、可调电阻，韩国三莹和日本三洋的电解电容，及保险管、发光二极管、热敏电阻、压敏电阻、各国品牌集成电路等等；是一家专业的电子元器件配套商，已有多年的配套服务经验。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。