查询词典 acoustic

Based on wake features and operational principle of wake homing torpedo , this paper introduces some methods of soft kill , hard kill and non-kill ,such as gas generator , magnetic wake , torpedo net defense , depth bomb , anti-torpedo torpedo , stealth , and evasive maneuver. We summarizes three key points in the defense against wake homing torpedo , including high perfo口nance torpedo alarm system , rapid response acoustic countermeasure system , and multi-functional acoustic countermeasure device , to provide approaches to effectively countering wake homing torpedo.

该文基于尾流特征及尾流自导鱼雷工作原理介绍了用于对抗尾流自导鱼雷的气幕弹、磁尾流、拖网、深水炸弹和反鱼雷鱼雷等几种软杀伤和硬杀伤方法以及隐身技术和机动规避等非杀伤方法总结了舰船对抗鱼雷攻击3 个的关键环节包括高性能鱼雷报警系统、快速反应的水声对抗系统和多功能的水声对抗设施旨在为有效防御尾流自导鱼雷提供思路。

The output of electron acoustic signal in the ferroelectrics is calculated on the basis of their piezoelectric properties. The results show that the magnitude of electron acoustic signal not only related with beam currents, beam power and modulation frequency, but also with sample properties especially electric parameters such as dielectric constant and spontaneous polarization.

本文首次以典型的铁电BaTiO〓材料为试样，从其具有的压电性出发，推导了这类材料的电声信号理论表达式，结果表明电声信号的大小不仅与实验参数如入射电流、入射电子能量以及调制频率等有关。

The numerical algorithms of the direct acoustic scattering problem with the Dirichlet boundary condition is studied,which is the foundation of the inverse acoustic scattering problem.

数值求解Dirichlet边界条件下的声波障碍散射正问题，这是声波散射反问题的研究基础。

In this dissertation, the author discusses the numerical solution for the direct acoustic scattering problem with the Neumann boundary condition, and pays more attentions to discuss numerical recovering the shape of the obstacle region, which is the inverse problem of the direct acoustic scattering problem with the Dirichlet or impedance boundary condition.

本文重点研究了Neumann边界条价下的声波障碍散射正问题和Dirichlet、Impedance边界条件下的声波障碍散射区域反问题的数值计算方法，得到很好的理论结果和数值结果。

In this paper,regularization method is introduced. The author pays more attentions to investigate the numerical solution for the direct acoustic scattering problem with the Dirichlet boundary condition, and the numerical recovering the shape of the obstacle region which is the inverse problem of the direct acoustic scattering problem with the Dirichlet boundary condition.

本文主要引入正则化方法，研究了针对Dirichlet边界条件的声波障碍正散射问题和声波障碍散射反问题的数值计算方法，并得到了很好的数值结果。

Objective To investigate the clinical features, glottal images and acoustic characteristics of patients with muscular tension dysphonia and evaluate the value of laryngoscopy and acoustic measurement in the diagnosis of MTD.

目的 观察肌紧张性发声障碍(muscular tension dysphonia， MTD)患者的临床特点，探讨喉镜检查及计算机嗓音声学检测技术在此类发声障碍诊断中的应用价值。

Objective To investigate the clinical feature, characteristics of acoustic and aero-dynamic peremeters of functional dysphonia contrasted with the normal adults and evaluate the value of acoustic and aero-dynamic measurements in the diagnosis and treatment of functional dysphonia.

目的 观察功能性发声障碍喉镜图像、嗓音声学特征及空气动力学变化，探讨喉镜检查、计算机声学分析、空气动力学变化在功能性发声障碍诊断、鉴别诊断、分类及治疗中的应用价值，初步建立功能性发声障碍临床诊断标准。

In order to study the influence of defect on the surface acoustic wave,based on the theory of elastodynamics,the interaction between elastic surface acoustic waves and surface-breaking defect was simulated numerically by means of the finite element method.

为了分析材料表面缺陷对声表面波传播的影响，以弹性动力学理论为基础，采用有限元方法数值模拟了声表面波沿金属表面传播及其与表面缺陷的相互作用。

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。

In my study, we use a 4F acoustic lens which f-number is 1.3 to set up a photoacoustic imaging system. With same axial and lateral magnification, 3D photoacoustic imaging system with 4F acoustic lens can detect photoacoustic signal distribution on object plane in real-time, and get the different axial distance signal to show the 3D photoacoustic image by different signal receiving time.

本研究采用相对孔径为1.3的4F声透镜，设计三维光声影像系统，利用4F声透镜景深范围内之轴向与横向放大倍率相等，即时性的重现物平面所发出的同调性光声讯号分布，并利用不同的接收时间来呈现不同深度距离的讯号成像，取得物平面上受测物的三维光声影像。

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。