弹性波

The inversion of strong scatterer imbedded in the half-space is a practical, but very difficult problem of strong non-linearity.

半空间弹性波强散射源逆问题是一个实用而又难度很大的强非线性问题，而经典的Born迭代方法只适用于弱非线性问题。

Test results indicate that the propagationvelocity of the elastic wave,shear modulus and coefficient of subgrade ...

实验结果表明：匀质土中弹性波的传播速度、剪切模量、地基抗压刚度系数均随土层深度增加而增大；不同性质的土层，其变化规律亦异。

The results show that the simplified viscoelastic equations not only have the better effects of single-shot records, but also have a better computational efficiency than Carcione's viscoelastic equations and it agrees well with the theoretical analysis.

结果表明该简化方程模拟得到的单炮记录不仅具有较好的效果，而且比Carcione黏弹性波方程计算效率高，与理论分析基本相符。

It is a new tool to detect and observe the structure and status of underground media by accurately measuring its transfer function through sinusoidal elastic wave accurately controlled in frequency and stable in phase.

它是使用一种精密控制频率和相位稳定的弹性波，对发射和接收两点间的传递函数进行精密测定从而监视和观测地下构造和状态的一种新型手段。

The active control of torsional wave propagating in a shaft and the LMS algorithm are described in this paper.

对扭转弹性波的主动控制系统以及LMS算法进行了描述。

Chapter 3 discusses seismic waves stimulated by point sources in transversely anisotropic media.

在第三章中作者求解了横向各向同性介质中点力源和点爆炸源激发的弹性波。

Some knowledge about wave propagation in anisotropic media has been obtained by studying elastic wave propagation properties of the transversely isotropic media.

3深入地研究了横向各向同性介质中弹性波场的传播特征，获得了一些各向异性介质中波传播的重要认识。

Acoustic Emission is a class of universal phenomena whereby transient elastic wave are generated by the rapid release of energy from localized sources within a material. In various field, people begin to use this phenomena to test these structures damage and evaluate their security.

声发射是材料中局部源快速释放能量而产生瞬态弹性波的一种普遍物理现象，人们已经开始在各个领域中利用这种现象进行研究对象的缺陷检测和安全性评价。

However, numerical modeling for nonlinear seismic waves is faced with problems such as steep gradients, shocks and unphysical oscillations. Accordingly, some special treatments have been presented to solve these problems. However, in our knowledge, there is no effective method to overcome these problems by far.

非线性弹性波的数值模拟存在陡峭间断面、数值振荡以及误差的指数级增长等现象而破坏数值解的稳定性、收敛性，能否消减上述现象的不利影响成为制约数值方法有效与否的重要因素。

The success or failure of elastic wave equation inversion are relevant to the selection of forward modeling methods.

正演模拟方法的选取与弹性波方程反演的成败直接相关。

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。