采用PZT传感器在钢管中激励并接收超声导波，研究导波在管道中传播时的反射、透射现象。
PZT transducers have been used to excite and receive ultrasonic guided waves in steel pipes. The reflect and transmission rules of guided waves are researched.
但由于传统的压电传感器存在着空气与普通的压电材料之间严重不耦合现象，所以压电传感器并不是高效率的超声源。
The traditional PZT, however, is not the ultrasonic source with high efficiency because of the serious non-coupling phenomena between air and ordinary piezoelectric material.
建立超声场中固态相变的能量作用模型，并解释实验现象。
The energy -interaction model of solid phase transformation in an ultrasonic field is established and the experimental phenomenon is explained.
自动清洗，解决超声波清洗难题，减少贴片抛料现象发生。
Auto clean, avoid cleaning troubles of ultrasonic cleaner, reduce rejection rate.
结论妊娠期间存在骨密度下降现象，但到产后6周才能检测到定量骨超声指标的变化。
Conclusion During pregnancy, bone mineral density decreased too slowly to be detected, and the changes of quantitative ultrasonic parameters could be detected until 6 weeks postpartum.
植物的超声发射是导管或管胞里空穴化时的伴随现象。
Ultrasonic emission is a phenomenon with cavitation of vessels or tracheids.
本文对超越性现象产生的条件、规律进行了试验和理论分析，丰富了超声波振动切削理论。
In this paper, the experiments and theoretical analyses are made about the occurring conditions and regularities of this phenomenon, which enriches the ultrasonic vibration cutting theory.
手术验证超声定位血管符合率100%，未见血管变异及阙如现象。
Surgery in line verified the rate of ultrasounded localization of vascular was 100%, no abnormal blood vessels and the non-existent phenomenon.
本文介绍一种利用超声调制光波现象测量超声波在弱散射液中传输速度的方法。
A new method measuring speed of sound in a weak scattering fluid is proposed by using the ultrasound - modulated light.
对样品进行了湿法腐蚀和超声实验，在显微镜下观察无膜脱落现象发生。
Through wet etching and ultrasonic experiment, no film falling is observed with microscope.
通过超声波对单轴压缩试验中岩石扩容现象的测试，分析了超声横波在不同岩石压缩过程中的传播情况。
By the test about the volumetric dilatancy in rocks under the uniaxial compression with ultrasonic, the propagation of ultrasonic S-wave was analyzed in the compressing process of different rocks.
实验结果表明，附加超声振动能改善放电间隙状态，减少短路、拉弧现象，提高了材料的去除率。
Experimental results show that the discharging gap is improved and the frequency of short circuit is reduced when ultrasonic vibration is added.
介绍了超声波具传播方向性强、介质振动强度大、在液体中可产生空化现象等特点。
Characteristics of ultrasound, such as strong directional transmission, high vibration intensity in the transmitting medium, and cavitation in liquid medium were introduced.
分析了超声设备的关键部位——超声探头在使用过程中所产生的故障现象与故障原因，并介绍了各类故障的处理方法。
Analyzes the failures and causes of ultrasound probe the key part of ultrasound equipment and describes the solutions for them.
探讨超声波空化现象及声流作用对铸轧铝板带组织细化作用的机制。指出目前超声波铝铸轧过程中存在的问题。
The mechanism of grain refinement during cast-rolling process with ultrasonic treatment is discussed, and the presented problems are pointed out.
解释了现有文献中测量结果不一致的现象。同时说明了超声波向油层的辐射能量少、因而辐射效率不高的原因。
The disagreement of various experimental results in present references and the causes of lower radiation efficiency of ultrasonic energy were explained.
目前认为术后经胸超声测得的瓣膜有效开口面积指数是唯一可准确描述该现象的指标。
Currently the indexed effective orifice area measured by postoperative transthoracic echocardiography is considered the only appropriate parameter which can accurately describe the mismatch.
细致分析了超声速喷流流动特征，特别关注了其中激波胞格和湍流相互作用现象。
We carry out a detailed analysis of the flow characteristic of the supersonic jet flow, and pay particular attention to the interaction between shock-cell and turbulence.
主要工作和结论如下：介绍了超声电机的特点、研究背景，概述了超声电机的非线性现象以及非线性动力学实验研究进展。
The contents are summarized as follows:The feature, background and apply of the USM are introduced, and the nonlinear phenomenon and experiment procedure about the USM are discussed.
研究了超声速气流中受热壁板的非线性气动弹性响应，发现了一种新的动态失稳现象——二次失稳型颤振。
A new dynamic instability phenomenon-secondary instability flutter-is found in the study of nonlinear aeroelastic response of heated panels in supersonic flow.
试验结果表明，该法有效地校正了高压开关烧结触头的超声C扫描图像的不均匀现象，提高了超声无损检测的准确性。
The experimental result shows that the non-uniformity of ultrasonic C-scan image is corrected and the accuracy of nondestructive testing …
试验结果表明，该法有效地校正了高压开关烧结触头的超声C扫描图像的不均匀现象，提高了超声无损检测的准确性。
The experimental result shows that the non-uniformity of ultrasonic C-scan image is corrected and the accuracy of nondestructive testing …
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