Under the conditions of different relative densities of sand and different vertical pressures, the variations of acoustic emission and tip resistance during the penetration were investigated.

Characteristic extraction of acoustic signals emitted from resistance spot welding process based on independent component analysis

基于独立分量分析的点焊特征声音信号提取

The method of computational fluid dynamics ( CFD) and test has been used to study the fluid dynamics and acoustic performances of resistance muffler.

本论文用计算流体动力学（CFD）和试验法研究抗性消声器的流体动力学特性和消声特性。

The acoustic radiation resistance matrix is combined with the velocity vector on a vibration surface to predict the total sound power radiated from the structure.

利用声辐射阻力矩阵和振动面上的速度矢量预报了结构声辐射的总功率。

A standing wave thermoacoustic engine connected with an RC ( acoustic resistance and acoustic capacitance) load was simulated with linear thermoacoustics to study the influence of load impedance on the performance of the thermoacoustic engine.

为了探索负载的阻抗特性对热声发动机性能的影响，利用线性热声理论，对驻波型热声发动机驱动阻容负载进行了数值模拟。

When the acoustic resistance of the load is fixed, oscillating frequency, heating temperature and input power to RC load will increase along with the increase of the length of the pressure amplifier in a certain range.

在负载的声阻固定的情况下，一定范围内振动频率、加热温度、负载入口声功随着压力放大器长度的增大而增大；

On the linear acoustic resistance of an orifice in an infinite thin plate

关于无限薄平板中圆孔的线性声阻

Equivalent Specific Acoustic Resistance of Sound Absorbing Materials

吸声材料的当量声阻率

Opposition to the flow of sound through a surface; acoustic resistance is the real component of acoustic impedance and acoustic reactance is the imaginary component.

声音在通过一个表面时受到的阻力；声阻是声阻抗的实部，声抗是声阻抗的虚部。

Effects of Axial Magnetic Field on Acoustic Resonance of Low Power Metal Halide Lamp

纵向磁场对小功率金属卤化物灯声共振的影响

The main methods are also put forward to handle acoustic resonance with electronic ballast.

并分析总结了电子镇流器解决声共振问题的方法。

The research on measurement of pipe length by means of acoustic resonance

利用声共振测量管件长度的研究

Preliminary research of chicken egg crack detection based on acoustic resonance analysis

敲击振动检测鸡蛋裂纹的初步研究

This paper tries to discuss the design intension of the master work, through the reading of the work's place, acoustic, shade and shadow, religious metaphor etc, and to move our inspiration of design.

本文通过对作品的场所、声学、光影、空间、宗教隐喻等方面的解读，探讨作品的设计内涵，试图给今天的建筑师们以新的启示。

Results: 1 The US appearance of breast cancer: Round or irregular mass with spiculated border, angled border, posterior acoustic shadow, minim calcified dots, rich blood flooding and irregular blood flooding, Etc.

。结果：（1）乳腺癌的超声表现：不规则形或圆形，纵横比1，边缘毛刺，边缘成角，后方声影，微小钙化，较丰富血流、不规则血流。

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.

结果青少年TM超声表现与成人相同，都表现为双侧睾丸内弥漫、散在、对称的直径在2mm左右的无声影小光点。

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。