Results Ultrasound characteristics of TM in teenagers were found similar to adult TM. Unique diffused and bilateral minute echogenic lesions, smaller than 2 mm, no acoustic shadow, were scattered within testicular parenchyma.

Qualitative inversion method was proposed to realize computer processing of defect identification by acoustic shadow overlapping method.

提出了定性反演方法，实现声阴影重叠法判别缺陷的计算机处理。

In the ultrasonogram, we found that the metal and glass foreign bodies were followed by acoustic tails, and the rest of non-metal were followed by acoustic shadow.

在金属和玻璃类异物之后为声尾，其余非金属类异物之后为声影。

Theoretical Study on Using Laser to Detect the Underwater Acoustic Signal

利用激光探测水下声场的理论研究

Design of the acoustic signal transmission system based on CPLD

基于CPLD控制的声信号发射系统设计

The theoretical and simulation analysis about acoustic signal processing in multi-path channel and the engineering software design are given in the dissertation.

该系统采用主动工作方式，本文系统地研究了在多途信道中对声学信号进行处理的理论研究和仿真分析及工程软件设计。

A Study on Acoustic Signal's Pickup by an Experimental Minisize Piezoelectric Ceramic Sensor

微型压电陶瓷传感器拾取声学信号的实验研究

At last, the theory and instrument of radio acoustic sounding system ( RASS) are discussed. It utilizes wind profiler radar to measure the temperature of the lower atmosphere layer.

最后讨论了无线电声探测器（RASS）利用风廓线仪测量大气低层温度的原理及其装置。

The experimental application of dst-3 type inter-borehole acoustic sounding and borehole acoustic oil-mining system in the Jidong ( eastern hebei) oil field

DST－3型井间声波探测和井中声波采油系统在冀东油田的试验

Relationship between Sonic Wave Velocity and Hest-conductivity Coefficient in Coal and Rock Acoustic Sounding In Explosive Rocks

煤层岩体中声波速度与导热系数的关系

Temperature-Measuring Radio-Acoustic Sounding System

测量温度的无线-电声探测系统

The Holocene Active Fault in the Western Part of Bohai Gulf Showed by Acoustic Sounding

声波探测显示的渤海湾西部全新世断层活动

A preliminary analysis of the acoustic sounding of the atmospheric boundary layer near the mountainous area

近山地区大气边界层声达探测的初步分析

The atmospheric wind profiler and radio acoustic sounding system with its applications

风廓线仪系统探测试验与应用

Experimental study on the relationship between rock fracture toughness and acoustic velocity

岩石断裂韧性与声波速度相关性的试验研究

Measurements of Material's Acoustic Velocity and Attenuation by Signal Analysis

用信号分析技术检测材料的声速和衰减

The Ray-Parameter Method for Acoustic Velocity Measurements of Thin Sediment Layers

测量海底沉积层声速的射线参数法

The latter has high coupling coefficient, low acoustic velocity and excellent temperature stability.

后者具有高的耦合系数，低的声速，好的温度稳定性。

Theoretical analysis on acoustical characteristics aluminum fiberboard

铝纤维板共振结构声学特性的理论初析

This paper discussed the practical significance of developing fibers and nonwovens composite material for acoustical absorption and sound insulation, introduced simply the application of fibers ( vegetable fiber, inorganic fiber synthetic fiber metal fiber) and nonwovens composite material in noise-reducing.

简介几类纺织纤维（植物纤维、无机纤维、合成纤维、金属纤维）及其非织造布复合材料在降噪领域的应用，说明了开发吸声隔音用纺织纤维与非织造布复合材料的现实意义。

The new concert hall is acoustically far superior to the old one.

新的音乐厅在音响效果上比旧的要好得多。