弹性波

Many natural phenomena and physical laws can be described by time dependent nonlinear differential equations, such as heat conduction equation, sound wave and elastic wave equation, reaction diffusion and convection diffusion equation, fluid and aerodynamics equations, etc.

大多数的自然现象与物理规律都可归结为与时间相关的非线性偏微分方程，诸如热传导方程、声波与弹性波方程、反应扩散与对流扩散方程、流体与气体力学方程组等发展方程。

Transmission coefficient of elastic waves in doping phononic crystal is calculated.

计算固－固掺杂结构声子晶体中弹性波的透射系数。

Consequently, it is necessary to study elastic wave scattering and vibration localization in structures.

为此，有必要研究结构中弹性波散射与振动局部化问题。

The elastic wave scattering of a cylinder with inhomogeneous interface properties is studied by use of wave function expansion method.

该文研究了这一问题，通过沿周向的离散化将弹性波散射的边界条件归结为一个超定线性代数方程组。

Elastic wave scattering and dynamic stress concentration in circular cylindrical shells with a hole are studied.

研究了含孔柱壳结构中弹性波散射与动应力集中问题。

The schemes presented in the present paper can be used for solving general problems, and their basic ideas can be directly used for treating elastic scattering problems as well as for establishing schemes for velocity and density inversion.

所建立的数值计算方案具有普遍的适用性，其基本思想可以直接用于解决弹性波散射的数值模拟问题并用于反演密度和速度。

This paper reviews the applications of singular integral equation to the scattering problems of elastic waves by cracks, especially by interface cracks, which were made during past two decades.

结合20多年来国内外的研究成果，评述奇异积分方程在裂纹体弹性波散射问题中的应用，特别是在界面裂纹散射问题中的应用。

Singular integral equation ; crack ; interface crack ; elastic wave scattering ; fracture dynamics

奇异积分方程；裂纹；界面裂纹；弹性波散射；断裂动力学

Principle, method and advantage of the elastic wave CT technology are introduced in this paper.

介绍了弹性波CT技术的原理、方法和优点。

The relationship between the delay in the error path and convergence coefficient and convergence time is emphasized.

重点讨论了弹性波控制中误差传递途径相对于主激励源的时间延迟与收敛系数以及收敛时间的关系，并回归出最佳收敛系数与延迟时间之间的倒数关系。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。