同时，声衰减系数的存在有利于轴向分辨率的提高。
Meanwhile, the existence of the acoustic attenuation coefficient benefits the axial resolution.
计算结果表明，面对面的周向布置声衰减效果最好。
It is shown by the numerical solutions that the face-to-face circumferential distribution has optimum sound attenuation.
本文引入两个与声衰减有关的介质参量，定义了声传播系数；
Two new medium parameters related to acoustic attenuation are introduced and an acoustic propagation coefficient is defined.
海洋声速、声衰减、温度、盐度、悬浮物等都是海水的重要参数。
Ocean sound speed, attenuation, suspended sand size and so on are all important ocean parameters.
悬浮液的声衰减分为三种主要类型：吸收衰减、散射衰减和扩散衰减。
The acoustic attenuation of suspending liquid is divided three kinds as absorption attenuation and scattering attenuation and diffusion attenuation.
基于声衰减原理进行水体含沙量测量的方法，需要测量声压的衰减值。
Based on the principle of sound attenuation to measure the sediment concentration of suspensions, the attenuation value of sound pressure must be detected.
通过建立有限长声屏障的绕射声衰减的理论模型，进行了这方面的探讨。
The paper study the problem by constructing theoretical model of diffracted sound attenuation of limited length barrier.
前言：目的：研究声衰减系数、声速、温度等媒质参数对声聚焦的影响。
Objective: Study the influence of parameters such as attenuation coefficient, velocity of sound, and temperature of medium on focusing sound field.
在高温状态下，超声波探伤实施的关键在于声耦合、声衰减和声路径的控制。
The linchpin of undertaking high temperature ultrasonic testing is the control of the coupling, attenuation and route of the sound.
结果表明：实验室和现场所得的沉积物声速、声衰减与沉积物的类型密切相关。
The results show that sound velocity and sound attenuation is correlated with types of sediment.
结果高频背向散射系数较声速、声衰减更能反映组织结构的变化，高频超声图像具有高的分辨率。
Results Compared with sound velocity and attenuation, the backscatter coefficient could reflect the structural change of biological tissue. The high frequency ul…
研究表明：护耳器现场使用实际声衰减值低于实验室值，其原因是护耳器的实验室测量条件较为严格。
The real decibel attenuation of the hearing protector in the workplace is lower than the value measured in the laboratory, because the measuring conditions in the laboratory are more strict.
文中详细研究了梯度高分子溶液在不同频率下，聚合物厚度及梯度结构的变化对反射声衰减效果的影响。
The effects on the underwater sound attenuation by the thickness and concentration gradient of polymers were measured in a sound tube at different frequency during the polymers dissolution process.
实验表明额隆内有若干点声衰减为负值及零值、意味着声波沿这些点传输时、声压非但不减小反而增大了。
The experiment showed that in the melon slices there were some points where the sound pressure attenuation coefficient were negative value or zero.
方法观察模块浓度的不同所致颜色与透明度的变化，并对PAA模块的声学特性包括密度、声速及声衰减进行测量。
Methods The color and transparency of different concentration phantoms were observed. Properties including density, acoustic speed and acoustic attenuation of PAA gel phantom were measured.
根据连续分层介质中声波传播理论建立了计算水溶性高分子溶解过程中声衰减的数学模型。计算结果与实验结果一致。
Depending on the experimental result and the theory of sound wave propagation in layered medium, a mechanism of gradient water-soluble polymer solution was developed.
文中以作者主持的海洋863项目“声光悬浮沙粒径谱测量仪”为例，列举了声速、声衰减、悬浮泥沙粒径谱的测量结果。
Taking 863 818 project, "Acoustics optic suspended sand size measurement System", as an example, the measurement results about speed, attenuation, suspended sand size distribution are listed.
结论静脉快速输入HL - 1可使兔肝脏组织结构发生相应的变化，使肝脏声吸收衰减增加，因而改变了肝脏组织声学环境。
Conclusion Liver tissues and structures varied by HL-1 quick intravenous infusion. The promotion in ultrasound attenuation and absorption indicated a shift of acoustic environment.
通过实验获得了声相位图与声幅度图，并通过数字图像处理获得了相应的速度图与衰减图。
After processing the amplitude image and phase image which was come from experiment we obtain the distribution of the velocity and attenuation.
目的研究凹球面超声换能器的声焦域在高声强和媒质有较大衰减情况下，其形状和几何位置的变化。
Objective the variations of the site and shape of focal region for a concave spherical ultrasound transducer in the case of high sound intensity and stronger attenuation were studied.
比较了纵向声子与横向声子对磁振子衰减的影响，也讨论了各项参数的变化对磁振子衰减的影响。
The influences of longitudinal phonon and transverse phonon on the magnon damping are compared, and the influences of the parameters are also illustrated.
本文报道了近年来我国在生物组织超声特性——传播速度、衰减、吸收、反射、散射和非线性声参量方面的研究进展情况。
We reported the main progress made in China in recent years of the study of ultrasonic tissue characterization-propagation velocity, attenuation, scattering and nonlinearity parameter, etc.
并根据声学原理计算了该声屏障绕射衰减量，提出了切实可行的补救措施。
The attenuation amount of diffraction of this sound barrie is calculated according to the acoustics principle, the feasible remedies are put forward.
采用格子气数值方法模拟了共振腔中气体声振荡衰减过程。
A lattice gas method is applied to simulate the attenuation of sound oscillation.
采用格子气数值方法模拟了共振腔中气体声振荡衰减过程。
A lattice gas method is applied to simulate the attenuation of sound oscillation.
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