A comparison study on two situations with and without coal load on a steel plate has been carried out by using audio and ultrasonic frequency .

应用声 超声及 超声 穿透 试验对钢板上有无煤负载两种情况进行了对比研究。

It was obtained that the radiation impedance of the ultrasonic transducer changes in evidence with the ultrasonic frequency and the sound speed of the well liquid .

当 超声波 的 频率、井液声速变化时，超声换能器辐射阻抗变化比较明显。

The good news is that because this call has an ultrasonic frequency we are unable to hear it .

好在这些声音是 超声波 频率，所以我们听不到这些声音。

With the same acting time and ultrasonic frequency influence of different transducer input power was studied .

在 超声波 的 频率和处理时间不变的情况下，改变换能器的输入电功率，实验研究了不同功率对血栓消融效果的影响。

Ultrasonic Frequency Quenching for Guideway Face of Lathe Bed by Self-made Quenching Car

自制淬火车实现床身导轨面 超 音频淬火

This paper also discusses the effects of ultrasonic frequency and power on the process .

本文综述了在这一领域的 最近研究进展，各种不同 频率和功率对 树脂 再生效果的影响，为该领域的研究工作提供参考。

The infection of ultrasonic frequency power effect time to ultrasonic effect have been studied based on experimental date .

依据实验数据分析了 超声 频率、功率及作用时间对超声作用效果的影响及规律。

Research on the application of the intelligent ultrasonic frequency spectrum analysis in NDT

智能 超声 频谱分析在无损检测中的应用研究

Phase-modulation property of optical fiber sensor is emulated and experiment results are also analyzed which show that the system could be used to identify the ultrasonic frequency characteristics on the surface of the solid plate transmission .

对传感系统的相位调制特性进行了仿真，并对实验结果进行了分析，结果表明该系统可用于固体中传播的 超声波 的 频率特征识别。

The effects of different factors such as extraction conditions ultrasonic frequency and intensity of ultrasound were studied .

考察不同的抽提条件、 超声 频率及声强对脱硫效果的影响。

Impedance Match of Transducer System in Ultrasonic Frequency Power Supply

超声电源换能振动系统的阻抗匹配研究

The effects of ultrasonic frequency ultrasonic intensity cleaning time cleaning temperature on oil sand separating were investigated .

考察了 超声 频率、超声声强、清洗时间和清洗温度对油砂分离的影响。

We use porcelain as cleaning object studied the cleaning effect of ultrasonic frequency power and role time on porcelain .

以瓷盘为清洗对象，人为涂抹食用油等，研究了 超声波 频率、功率和作用时间对瓷盘清洗效果的影响。

To analyze the effects of water and ultrasonic frequency pulse air and oxygen plasma arc cutting experiments were carried out in the the dry and wet circumstances respectively . The dc cutting and the ultrasonic frequency pulsed experiments were also conducted in every case .

为了分析水中 超声 频脉冲和不同等离子气的工艺效果，分别在干式和湿式条件下，进行了空气和氧气等离子切割试验，并且每种试验条件下都进行了直流切割以及超声频脉冲切割。

The system also includes a transducer for converting the ultrasonic frequency electric signal to an ultrasonic inertial vibration .

超声换能器是把 超声电信号转换成超声振动信号作用于人耳后的乳突骨。

RESULTS & CONCLUSION : The extraction effects were different in using ultrasonic extractors with different power levels and ultrasonic frequency .

对同批样品进行反复测试结果与结论：不同功率、 频率 超声提取仪提取效果和对含量测定的结果不同。

Ultrasonic power and ultrasonic frequency may adjust according to the needs .

超声功率与 超声 频率可根据需要调整。

The relation between the ultrasonic frequency f and the wavelength λ - o was deduced .

推导出 超声波 频率f和光波波长λo的调谐关系；

Research on TIG welding arc with numerical simulation by using ANSYS Ultrasonic frequency pulse tungsten inert gas welding power source topology and welding applicability

基于ANSYS的TIG焊接电弧数值模拟研究 超音 频脉冲TIG焊电源拓扑及电弧焊适用性

Ultrasound part the ultrasonic detecting life design general structure ultrasonic frequency probes and sensors do reasonable option and the detailed design of ultrasonic pulse drive source produce circuit launch system circuit and the receiving system circuit .

超声部分设计了超声波生命探测的总体构成，对 超声 频率、探头和传感器做了合理的选择，同时详细设计了超声波脉冲激励源产生电路、发射系统电路和接收系统电路。

However the improvement of ultrasonic frequency increases the noise impact and increases the difficulty for extracting the edges of the vessel wall intima and adventitia .

但 超声 频率的提高加大了噪声的影响，增加了血管壁内外膜边缘提取的难度。

Ultrasonic frequency invariance and its application in flaw classification

超声 频率一致性分析及其在缺陷分类中的应用

In this paper the series of problem of detecting partial discharge ( PD ) ultrasonic signal and locating PD sources in transformer are systematically discussed . The new algorism of locating PD sources based on the ultrasonic frequency spectrum analysis is put forward .

探讨了变压器局部放电超声波信号检测及局部放电源点定位中的若干问题，提出了基于 超声波 信号频谱分析的放电源点定位算法。

Density of ultrasonic power and ultrasonic frequency fairly greatly affected the extraction yield with increasing of density of ultrasonic power extraction yield enhanced . Compared with 38 kHz ultrasound 20 kHz ultrasound had advantage of extraction .

超声功率密度和 频率对萃取率具有较大影响，随着超声功率密度的增大，萃取率增加，而20kHz与38kHz超声相比，20kHz超声对萃取更为有利；

Effect of ultrasonic frequency change on methamidophos degradation in low frequency ranges is very insignificant ;

低频范围内改变 超声波 频率对甲胺磷降解的影响很小；

Ultrasonic frequency pulse tungsten inert gas welding power source topology and welding applicability

超 音频脉冲TIG焊电源拓扑及电弧焊适用性

Ultrasonic frequency adjustable driver 's circuit design

一种 频率可调 超声波驱动电路的设计

Mono-factor experiments and orthogonal experiment showed that the ultrasound temperature could have a greater impact on extraction of the pigment than extraction time and ultrasonic frequency .

单因素试验和正交试验表明：温度对提取玉米粗蛋白粉黄色素的影响较大，其次为超声处理时间，而 超声 频率的影响较小。

End turning and centering machine for rear axle house Ultrasonic Frequency Quenching for Guideway Face of Lathe Bed by Self-made Quenching Car

后桥壳车端面打中心自制淬火车实现床身导轨面 超 音频淬火

This conclusion has certain guiding significance in aspect of applying ultrasonic frequency to detect material level in ball mills .

该结论对 超声在球磨机料位检测方面的应用具有一定的指导意义。