For clean sandstone, the acoustic dispersion of compressional wave exists obviously when its porosity is more than 28%.

An experimental study of acoustic dispersion of rock and extrapolation of the velocity

岩石声频散的实验研究及声波速度的外推

A Survey on the Acoustic Dispersion in Shaly Sandstone

泥质砂岩声频散性考察

Surface Acoustic Wave filter and ceramic filter are primarily used in the traditional wireless communication systems; they can not meet the needs of current communication system because of large volume or low operating frequency.

传统用于无线通信的带通滤波器以介质陶瓷滤波器和声表面波滤波器为主，他们因为体积大或工作频率低等因素已经不能满足需要。

Surface Acoustic Wave Filter ( SAWF) is a sort of analogue device for signal processing.

声表面波器件是一种新型的模拟信号处理器件。

The utility model adopts surface acoustic wave filter, and the circuit is simple to realize.

采用声表面波滤波器，电路实现简单，调整方便，一致性好。

Evolutionary Design for Surface Acoustic Wave Filter

声表面波滤波器进化设计

Design of a RF Bulk Acoustic Wave Filter Using PZT Thin Film

采用PZT薄膜的体声波RF滤波器设计

Application of surface acoustic wave filter in television

声表面波滤波器在电视机中的应用

Analysis of the response of surface acoustic wave filter using admittance parametric

应用导纳参量分析声表面波滤波器的响应

Exploration on Teaching of Surface Acoustic Wave Filter and Developing Students' Comprehensive Ability

声表面波滤波器教学与学生综合能力培养的探索

Evolutionary design for surface acoustic wave filter based on genetic algorithm

基于遗传算法的声表面波滤波器进化设计

Inversion method of physical parameters in concrete based on the acoustic frequency detection technique

基于音频检测技术的混凝土无损检测技术

Research on Effect of Technology on Plant Acoustic Frequency Control in Cotton

植物声频控制技术在棉花上的应用效果研究

Application of acoustic frequency technique in shipbuilding technology

声频技术在船舶建造工艺中的应用

Application of acoustic frequency technology to protected vegetable production

植物声频控制技术在设施蔬菜生产中的应用

Emphasis is placed on the acoustic survey, which includes survey design, acoustic instrument calibration, survey data collection, fish target strength determination, echogram scrutinizing, data processing and fish biomass estimation.

其中重点介绍了声学调查与评估，它包括调查设计、数据采集、目标强度确定、映像分析、数据处理、生物量计算等。

The imaging logging instruments include the electric imaging logging instrument and acoustic imaging logging instrument, as well as the array nuclear imaging logging instrument and nuclear magenetic resonance imaging logging instrument which are under development.

成像测井仪有电成像测井仪和声成像测井仪，正在研究中的还有阵列核成像测井仪和磁共振成像测井仪。

Then according to the function of the instrument, adopting a distribution processing method, the paper has discussed the realization scheme of a dipole array digital acoustic well logging instrument based on DSP.

接着根据偶极子数字阵列声波测井仪的具体功能和性能要求，采用分布式处理的设计思想，论述了一种基于DSP的偶极子数字阵列声波测井仪的实施方案。

A Computer-based Acoustic Emission Detecting Instrument for Partial Discharge within Power Capacitor

电力电容器局部放电微机化声发射检测装置

The Design Of Digital Acoustic Well Logging Instrument Based on DSP

基于DSP的数字声波测井仪设计