声学的

The structure-acoustic coupled models of Santana2000 are built both with and without absorption material, and ANSYS finite element analysis software is used to calculate interior acoustic pressure due to panels vibration under specific frequency, then the acoustic contribution of panel is evaluated.

以桑塔那2000型轿车为实例建立无吸声材料和有吸声材料的结构-声学模型，使用ANSYS有限元分析软件计算车身板件在给定频率下振动引起的车内声压，进而求得板件的声学贡献。

The loudspeaker device may further include a fourth acoustic driver comprising an axis, arranged along the line so that a projection onto the azimuth plane of the fourth driver axis and the projection of the second driver axis are coincident.

扬声器装置还可以包括具有轴线的第四声学驱动器，沿着所述直线设置所述第四声学驱动器，使得第四驱动器轴线在方位平面的投影和第二驱动器轴线的投影重合。

Drift electron mobility, the Hall factor and Hall mobility in GaN are calculated according to Mattiessen's rule as a function of temperature for carrier concentrations with the compensation ration as a parameter on the basis of taking into account the individual average scattering momentum relaxation time of four scattering mechanisms, namely, ionized impurity scattering, polar mode optical scattering, acoustic piezoelectric scattering and acoustic phonon deformation potential scattering which have an effect on electron mobility of GaN.

考虑了对纤锌矿型氮化镓低场电子输运影响最为显著的4种散射机制－电离杂质散射，极化光学波散射，声学波压电散射和声学声子形变势散射的单个平均动量驰豫时间，采用Mattiessen's rule计算了不同补偿率以及不同载流子浓度条件下，氮化镓电子漂移迁移率，霍耳因子以及霍耳迁移率随温度的变化。

Communication acoustics, the result of interpenetration between information technology and acoustics, is now getting a big extension in its researches and applications, due to the development of DSP technology.

作为声学与信息技术相互渗透的产物－通信声学，近十几年来随着数字信号处理技术的发展，其研究和应用领域得到了很大的扩展。

Lande technology since 2000 acoustic testing to explore the mainland market space, at home several times to assume the construction of large-scale acoustic engineering laboratory mission.

朗德科技从2000年开始开拓国内声学测试用房的市场，在国内多次承担大型声学实验室建设的工程任务。

In this paper,the principle and primary results of measure ultrasonic sound velocity and attenuation coefficient by ultrasonic syntonic method are introduced.

1 前言各种介质的声学特性主要由声速、声衰减、声阻抗等参数来描述，这些量统称为介质的声学特征量。

Acoustics and vibration - Laboratory measurement of vibro-acoustic transfer properties of resilient elements - Part 2 : dynamic stiffness of elastic supports for translatory motion - Direct method.

NF S31-030-2-2000 声学和振动。弹性元件振动声学传输性能的实验室测量。第2部分：平移运动用弹性支架的动态劲度。

ABSTRACT Theoretical analysis of the feed pipe inflow of self-excited pulsating and cavitating jet is given on the basis of fluid transient...

利用流体瞬变流和水声学理论分析了自激振荡气蚀射流喷管内的流动规律，建立了喷管内水声学特性的特征方程，并给出了数值解。

Meanwhile,it was pointed out in this paper that flexible pole-oilstone holder could be considered as a single vibrations system when designing acoustics subsystem,as pioneers a new in designing acoustics system of ultrasonic honing.

文摘：经试验证实了超声珩磨声学系统中存在着局部共振现象，指出&挠性杆-油石座&振动子系统设计时可作为一个单独的振动体系进行考虑，为超声珩磨声学系统设计开辟了一条新的思路。

Making use of test data and some instances presented in test,it could be apprvoed that partial resonant vibrations of acoustics system occurred in ultrasonic hoing.Meanwhile,it was pointed out in this paper that flexible pole-oilstone holder cou

文摘：经试验证实了超声珩磨声学系统中存在着局部共振现象，指出&挠性杆-油石座&振动子系统设计时可作为一个单独的振动体系进行考虑，为超声珩磨声学系统设计开辟了一条新的思路。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。