Aristotle (384-322 BC) recognized the need for a conducting medium and stated that the means of propagation depended on the properties of the material.
亚里士多德(384BC- 322bc)认识到传播媒介的重要性，并指出声传播的方式取决于材料的特性。
The production method of the movie, its medium propagation way and effect produced by it make it become a kind of mass media.
电影的生产方式，它的媒介传播方式及这种媒介所产生的效果使它成为一种大众传播媒介。
The model of wave propagation in functionally graded material (FGM) is introduced to soil medium, and the concept of functionally graded soil medium is brought forward.
研究了将功能梯度材料中应力波传播的计算模型应用到土介质中，提出了梯度土介质的概念。
Simulated example illustrates the wave propagation in a dispersion medium.
计算实例可以看出频散介质中波的传播情况。
Phenomenon of the change in velocity of propagation of monochromatic radiations in a medium as a function of the frequency of these radiations.
在介质中传播的单色光改变其传输速度的现象，并由该辐射的频率所决定的。
The generalized reflection-transmission coefficient matrix method is developed to study the acoustic wave propagation in a layered cylindric symmetric medium.
本文将广义反射、透射系数矩阵方法推广用于研究声法测井中的声波传播问题。
Propagation of seismic wave in complex medium is mostly simulated by numeric solution of oneway or two-way wave equation.
复杂介质中地震波的传播多是通过求取单程或双程波动方程的数值解进行模拟的。
Propagation characteristics of longitudinal ultrasonic guided waves of steel rod embedded in infinite medium are studied in theory.
从理论上分析高频纵向超声导波在埋于无限大介质中钢杆传播的特性。
Propagation and evolution of linear waves in the self-gravitational medium are discussed in a comparatively general way.
本文以较一般的方式讨论了自引力介质中线性波的传播和演化。
The paper constructed a time depth conversion model of plane wave propagation in two layer medium.
本文构造了一种在二层介质中平面波传播的时—深转换模型。
The fourth medium, namely the Internet, has a great influence on the practice and theory of news propagation.
第四媒体即因特网对新闻传播的实践与理论，产生了深广的影响。
Wave propagation in porous medium is an important subject in geotechnical and earthquake engineering.
多孔介质中的波的传播是岩土抗震工程中的一个重要课题。
As a special form of knowledge propagation, teaching in class is bound to be restricted by medium.
课堂教学作为一种特定的知识信息传播形式，必然要受到传播媒体的制约。
The dispersion is due to the inhomogeneity of medium, which will lead the energy of sound to deviate from its direction of propagation.
另一部分则是由于声波在不均匀介质中的声散射把能量散射到其他方向，而使原来传播方向上的声波能量减弱。
It is shown that the nonlinearity and inhomogeneity of the medium, laser power and input beam parameter affect their propagation properties.
结果表明，介质的非线性性和非均匀性、激光功率及入射光束参数影响其传输特性。
It is revealed that the viscosity effects on the relationship of the amplitudes and wave propagation time with the damage are necessary to consider in the damaged medium.
比较是否考虑粘性时的波幅和波传播时间与损伤的关系，表明粘性是损伤混凝土介质中波传播所必须要考虑的问题。
The numerical solution of wave propagation may be obtained by solving for the differential equation of medium motion.
通过求解介质运动做分方程，获得了波的传播问题数值解。
The propagation of seismic waves is affected by the earth medium.
地震波的传播是受地球介质影响的。
And the effect of limit concentration and concentration of the medium at normal temperature on the dynamic control process of crack propagation is also discussed.
并对极限浓度及常温下介质浓度对裂纹扩展的动力学控制过程影响进行了讨论。
Two new medium parameters related to acoustic attenuation are introduced and an acoustic propagation coefficient is defined.
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；
Using the theory of wave propagation, one-dimensional wave equation and inverse problem of damaged medium was established and analyzed.
利用波传播理论，建立损伤介质的一维波动方程及反问题分析理论。
Finite Element Technique based on Rayleigh-Ritz idea is used to solve wave propagation in non-homogeneous medium with variable velocities.
为求解变速不均匀介质中波的传播问题，使用了利用瑞雷-里兹法的有限元技术。
This paper derives an energy attenuation formula of seismic waves in the wavelet-scale domain from the wavelet theory and seismic wave propagation equation in anelastic medium.
本文从小波理论出发，结合地震波在黏弹性介质中的传播方程，推导出小波尺度域地震波能量衰减公式。
The space distribution model of laser propagation in strong scattering medium is advanced. The theoretical analysis for the press irradiation is made.
提出激光在强散射介质中传播的空间分布模型，对压缩照射进行了理论分析。
Elastic wave propagation in anisotropic medium is simulated by solving the equation system with the aid 'of Fourier numerical method (pseudo-spectrum method).
本文利用傅里叶数值方法(即伪谱法)求解该方程来模拟各向异性介质中弹性议的传播。
With kernel medium model, sound propagation characteristic in grain is studied.
从颗粒介质模型出发，对粮食中声传播性质进行了研究。
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.
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。
Based on the theory of Rayleigh wave propagation in layer medium, the variation of wave velocity can reflect the variation of rock and soil mechanical property.
根据瑞雷面波在层状介质中的传播理论，波速的变化可以反映出岩土力学性质的变化。
The mathematical model which describes seismic wave propagation in elastoplastic medium is developed on the basis of elastoplastic the - ory.
本文根据弹塑性理论，提出一种弹塑性介质地震波传播的数学模型。
The mathematical model which describes seismic wave propagation in elastoplastic medium is developed on the basis of elastoplastic the - ory.
本文根据弹塑性理论，提出一种弹塑性介质地震波传播的数学模型。
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