查询词典 ultrasonic sound

In our country, with the velocity and axis load increase, making the rail failure and fatigue deteriorate accordingly, so the detecting period diminishment is on trend. It is obvious that making research on ultrasonic detecting is great important to guarantee the railway in sound operation.

在我国，随着列车速度提高和轴重的增加，钢轨伤损发展速度也相应加快，致使检测周期亦有缩短的趋势，开展钢轨探伤，是保证铁路畅通运行的重要措施。

Ultrasonic technology is based on high-frequency sensors to measure the sound.

超声波技术是根据高频率的声音感应来测量的。

Donghe has successfully developed the technology of automatic switching frequency to sound source, which has filled in the blank of domestic ultrasonic trade technology and products Its products are applied to lots of trades, such as electron, machinery, automobile, aviation, national defense weapon, horologe, glass, fiber, optics, jewellery, axletree, etc.

产品广泛应用于电子、机械、汽车、航空、国防武器、钟表、玻璃、化纤、光学、珠宝、轴承等行业。

Measuring sound velocity in the air using stationary wave method is discussed in this paper,phase comparison method and Lissajous figure method both could determine the wave length of ultrasonic wave.

1引言在大学物理实验教学中，测量空气中的声速用传统的共鸣管方法和超声波方法。

sound velocity ; temperature ; stationary wave method ; ultrasonic wave

虽然用超声波测声速具有以上优势，但实验数据的精确度在一定程度上受到超声波信号发生器的稳定性、压电陶瓷换能器的效率、周围环境温度等因素的影响。

The wave front of the ultrasonic wave can be changed by using the sound lens.

目前 ，增大超声波在岩层中传播距离的方法是增大超声换能器的功率。

High-frequency ultrasound has important diagnostic value in the Disease of the musculoskeletal system,as an unfound,fast and easy to reduplicative imaging in Musculoskeletal system diseases.The sound beam of ultrasonic visualization can cut through the joint space,which offers a convenient and shortcut bases in the localization.

高频彩超作为一种无创、快速、便于重复的影像学检查方法，对于肌肉骨骼系统疾病应用诊断价值高，超声显像的声束能从骨关节间隙中穿过，在定位方面提供了简便快捷的依据。

In this paper, the author discovers the relationship between air pressure and velocity of sound using ultrasonic sensor in local microenvironment.

本文在局部小环境下，使用超声波传感器测量声速的过程中，发现了气压变化与声速变化之间的变化规律。

Ultrasonic wave pulse technique was used to investigate the velocity of sound and attenuation of the damaged samples PBXN-S.

采用超声探伤仪对损伤材料PBXN-5的声速和声衰减进行了测量。

The intensity of the ultrasonic wave will increase when the ultrasonic wave is focused by the sound lens in rock stratum.

然而 ，这种方法要受到两个因素的制约：一是增大超声换能器的功率，必然要增大超声换能器的尺寸，这在本身尺寸就很小的油井中是有一定限度的；二是当超声换能器辐射出的超声波的强度过大时，在超声换能器的周围要发生强烈的空化现象，产生大量的气泡，这些气泡将对超声波产生强烈的散射作用，导致超声波的衰减，反而降低超声波在岩层中的传播距离[1] 。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。