超声波的

A sectional hyperbola cylinder sound lens using for oil recovery is designed according to the refraction law of sound.

对于一定的油井，无法改变油井中的原油及其岩层对超声波的衰减作用，但是，利用声透镜可以改变超声换能器所辐射出的超声

By means of a linear array CCD lightintensity distribution measuring system, via the variation of the frequency and the power of ultrasonic wave, the direction control and the intensity modulation for the laser beam can be carried out. The relation curve between acoustooptic deflexion and modulation measurement is given.

在实验中，应用线阵CCD光强分布测量仪等，通过改变超声波的频率和功率，分别实现了对激光束方向的控制和强度的调制；定量给出了声光偏转量的关系曲线和声光调制测量的关系曲线。

Vibration processing/molding has been recently developed, in which polymer melt essentially flows or deforms under periodic stress in direct/superposed mechanical oscillation or ultrasonic vibration shear/pressure so that the flow field and some physical processes are varied.

近年来出现了振动加工成型，其实质是在机械振动、超声波的直接作用或叠加在剪切、压力流上，使聚合物熔体在周期性变化的应力下流动和变形，从而改变流场类型、强化流场强度和一些物化过程。振动会影响材料的粘度和松弛行为，所以也会影响分子扩散和剪切速率敏感的共混等过程。

Secondly, there has severe noise with width spectrum due to the powerful irradiating microwave pulses. This is a big challenge to design and realize the receiver subsystem to detect the weak MITA signals.

其次，激励所用的高功率微波脉冲会产生很宽频带的强电磁干扰，这对于微弱的微波热致超声波的检测形成巨大的挑战。

Supersonic energy was utilized to study the modified Tessier sequential extraction proce-dure for speciation analysis of heavy metals in soils.

利用超声波的能量研究了经改进的Tessier 系列萃取法，并用此法萃取分析了土壤中重金属的形态。

Because different temperature has an effect on the speed of the ultrasonic wave.

因为不同温度将影响超声波的速度，因此借助自动温度补偿，此精密仪器能在不同的环境下做出比较准确的测量。

The advantage of this kind sensor is that the feeble vibration produced by ultrasonic wave can be detected accurately.

验证了一种基于光纤Fizeau干涉仪的声发射传感器，可用于固体表面传播的超声波的检测。

We analyze they are concerned with arterial diameter, stegnosis degree, anatomical position among arteries, compensatory circulation, the fixing of TCD, artery variation, angiospasm and the reliability of DSA.

我们分析与动脉管腔大小、狭窄程度、动脉之间的解剖位置、侧支循环代偿、TCD定位不准、颅骨对超声波的吸收，及血管变异和吻合、血管痉挛、代偿性高流速、DSA结果的可信度等有很大关系。

Chapter one introduces the ultrasonic iatrology, including the summarization of ultrasonic and the mechanism of treatment etc.

第一章简要介绍了超声医学的发展概况，包括超声波的概述及超声治疗的机理等。

How to improve the signal-noise-ratio of the received thermo-acoustic signals in terms that the irradiating microwave power should be decrease possibly is the keystone of a successful system.

如何在减小激励微波功率的前提下，尽量提高热致超声波的信噪比是这一系统的成败关键。

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。