声学

Because of the existence of natural detecting blind area o f general radar on detecting flying object flying in veryˉ low altitude, it is so essential to put forward a suspended bomb t heory which would make use of sound wave's characˉ teristic parameters as its wavelength and spectrum to get the obje ct's direction and position, and to discuss its orientaˉ tion method and embattle model.

由于现有的常规雷达探测超低空飞行的来袭兵器有其固有的盲区，作为雷达的必要补充，利用声音的大小、频谱等特征能够反映声源的方位等特征参数的特性，提出了一种被动声学探测悬浮弹理论，并对其定位算法和布阵模式进行探讨，目的是防御拦截低空超声速巡航导弹。

Therefore, if acoustic method is to be used for quantitative assessement of submerged Enteromorpha prolifera, the physiological and biochemical characteristics of Enteromorpha prolifera need to be observed concurrently.

因此，若欲利用声学方法对下沉浒苔资源进行定量评估调查，需对浒苔的生理生化特征进行同步观测研究。

In the Sixth Chapter, the Wavelet analysis method is introduced in discussing some acoustic imaging problems related to the physical background of the ultrasonic detection. In the light of the solution of some theoretical problem in the 2D Wavelet transmission of two components form, the enhancement and identification of the spotty and fibriform faults of the acoutic image, along with two acoustic image deblurring methods based respectively on the acoustic physical feature analysis and the acoustic image's spatial feature analysis of the object, are realized. Therefore the image degeneration problem resulting from the acoustic beam diffusion or the acoustic focus diffusion in the ultrasonic detection are effectively improved. The software for this purpose has also been developed.

第六章首次应用小波分析的方法，研究了与超声检测的物理背景有关的一些声象处理问题，在解决了二分量形式的二维小波变换中的一些理论问题的基础上，建立起了对声象中点状和线状缺陷目标的增强与分离方法，以及分别基于目标的声学物理特征分析和基于目标声象空间特征分析的二种声象弥散消除方法，实验分析结果表明，这种方法较好地解决了超声检测中由于声束截面或声焦点扩散所造成的成象退化问题。

Through the experiment results, in different phonation model, analysis the properties of glottal vocal efficiency, vocal folds vibration, and voice source.

我们在对嗓音—呼吸系统进行自动分割与分段特征表达的目标指引下，建立了具有国内一流水平的嗓音声学实验室；从概念上对嗓音—呼吸系统重新划分，以声门为中心分别建立去耦合和弱耦合条件下的嗓音—呼吸系统和肺胸系统数学模型；采用离体犬喉作为声带振动的物理模型，对数学模型进行完善与证实；采用盲解卷技术在去耦合和弱耦合条件下，提取上下声道传递函数、嗓音源和发声效率，研究上下声道去耦合和弱耦合条件下不同发声方式与状态对发声效率的影响。

Objective:To investigate the relationship between acoustic analysis and auditory assessment of hoarseness.

目的：探讨嗓音声学分析参数与声嘶程度心理听觉评价之间的关系。

Therefor, the limits to explain isolatedly the individual process of light emission in microlaser only through cavity quantum electrodynamics effect can be avoided by the connecting the cavity quantum acoustics effect and the cavity quantum electrodynamics effect and dealing with the emission problems in microlaser from the overall point of view.

因此将&腔量子电动力学效应&和&腔量子声学效应&结合起来，从全局的观点处理微激光器中的发光问题，避免了单用&腔量子电动力学效应&孤立地解释微激光器中发光分过程所导致的局限性。

The acoustic levitator facilitates a variety of measurements on single panicles or single drops of liquid.

声学悬浮仪能简化单个颗粒或单个液滴的各种测量。

Objective To evaluate the effect of multimodality MR imaging and myocardial contrast echocardiography in determination of myocardial perfusion and decision of myocardial viability.

目的评价MR多技术扫描和心肌声学造影在检测心肌灌注、判断心肌存活中的作用。

The fast multipole boundary element method was applied to calculate the interior acoustic problems.

将快速多极边界元法应用于计算内部声学问题，预测了消声器的传递损失，并与传统边界元法作了比较，验证了所发展FMBEM的正确性。

Evaluation of a thrust chamber assembly for combustion stability includes analyses for nonacoustic, hybrid and acoustic modes of instability.

评价一个推力室，供大会燃烧稳定性，包括分析nonacoustic ，混合和声学模式的不稳定。

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。