声学的

Based on the acoustic absorption theory of microperforated panel and by the means of the theoretical analysis and emulation, the paper focuses on the acoustic characteristic including acoustic impedance, frequency and acoustic absorption coefficient of microperrforated panel working in the combustion chamber which has high temperature and great temperature gradient.

摘要根据微穿孔板吸声理论，采用理论分析和仿真的方法，着重讨论微穿孔板在温度梯度下的声阻抗、共振频率和吸声系数等声学特性，分析其受温度影响变化的机理。

With the development of education, the classroom acoustical environment has become one of the important objects in the research of acoustics.

本文的目的和意义在于针对我国经济发展水平的现状，对教室的声学环境进行研究。

The strings act as part of the acoustic reflection when under the canopy, and then become acoustically transparent over the rest of the space.

作为声反射时的天篷下采取行动的一部分字符串，然后成为透明声学在剩余的空间。

The finite element models of an engine block, oil pan, valve cover and gear cover were established by using the ANSYS software, and the calculation results were validated by the test results.

无论采用何种燃油供给系统和燃烧方式，都有必要对柴油机表面的振动特性和声学特性规律进行研究，在噪声向外传递的途径上最大限度地控制噪声水平。

Equivalent stretch elastic modulus E,sound reflection R and transmission coefficient T are calculated by the method of equivalent stiffness and transfer matrix separately.

通过试验获取了碳纤维、凯夫拉纤维、玻璃纤维、超高分子量聚乙烯纤维复合材料的力学性能和声学性能参数，在此基础上分别利用等效刚度法和传递矩阵法，对CF/UHMPEF、CF/KF、CF/GF混杂纤维复合材料的拉伸刚度、声反射系数和声透射系数进行计算。

VAV system can not only supply favorable thermal environment and indoor air quality but also supply favorable acoustical environment.

变风量空调系统不仅应提供良好的热舒适性和室内空气质量，还应提供安静的室内声学环境。

They found Mary, as usual, deep in the study of thorough bass and human nature; and had some new extracts to admire, and some new observations of thread-bare morality to listen to.

她们发觉曼丽还象以往一样，在埋头研究和声学以及人性的问题，她拿出了一些新的札记给

To evaluate the quantitative acoustic densitometry technique in myocardial fibrosis diagnosis and to explore the effects of benazepril and valsartan on myocardial fibrosis.

目的探讨声学密度定量分析技术评估高血压心肌纤维化的价值，同时观察苯那普利和缬沙坦对高血压心肌纤维化的作用。

The physical characteristics of sea bottom are very important not only for oceanographers and acousticians, but also for geophysicists, geologists and specialists of oceanics.

海底物理特性对海洋学家、声学家、地球物理学家、地质学家和海洋工程学家都是很重要的。本文评述了这一领域的新进展，包括：1。

The detailed works are as follows: 1. Realization of numerical simulation for rotationally asymmetric sound absorbent structures by finite element method.

具体工作在如下两方面：(1)具有旋转对称腔体和非对称基材单元的水下吸声结构声学特性在数值仿真的实现。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。