波的传播

The static natural frequencies and dynamic frequencies (under 3000rpm) are calculated by the finite element method and cyclic symmetry technique. The rotating vibration behaviors of the two models are compared. Different vibration characteristics between the two models are discussed. Geometry mismatch in a turbine blade root, which arose in manufacturing process or caused by wearing out during service, leads to contact conditions changed in fir-tree attachments. As a result, shifting of the fundamental frequencies and redistribution of stress in the blade base possibly cause failure of the blade.

在叶片—轮盘耦合系统振动研究方面，建立了带围带的叶片振动计算模型和带围带的叶片—轮盘耦合系统振动计算模型，考虑旋转离心力作用，采用波传播技术，对两种模型分别进行了整圈模态分析，得到了某汽轮机叶片模型和叶片—轮盘耦合模型在0转速和工作转速(3000rpm)下的振动模态，并对所得结果进行分析比较，讨论了整圈叶片振动模态与叶片—轮盘耦合振动模态的区别。

This paper discusses the mechanism of the propagation of elastic surface wave,presented a method that use the tip of atomic force microscopy and beam deflexion method to on line detect the nanometer vibration of the particle in the surface wave.

本文探讨了表面弹性波传播的机制，提出了一种利用原子力显微镜微探针与光束偏转法检测纳米振动的新方法，并利用这种方法对表面波质点的纳米振动进行了实时检测。

Is the wave due to changes in the density of the medium, so that the oscillations of the particles are in the direction of the propagation?

光波是由于介质密度的变化，而使得粒子向波传播的方向作振动的吗？

In this paper, a least-square collocation formulation for solving Helmholtz equation with Dirichlet and Neumann boundary conditions was established.

对于Helmholtz方程问题，其微分方程和边界条件可表示为法应用于Helmholtz方程问题的研究，建立了 Helmholtz方程问题的最小二乘配点格式，分别研究了Hdmholtz方程的波传播问题和边界层问题。

And at the same time, through discussing the mechanism of earth wave absorbing tomography, it is known the CT of seismic absorption imaging method is better than the wave velocity imaging method in the identify ability of faultage crushed zone whose body structural plane is flabbiness and the dimensions is small.

阐述了地震波在粘弹性介质传播过程中具有的衰减特性，探讨了地震波吸收层析成像的机理，得知地震吸收CT成像方法，对岩体软弱结构面、裂隙和规模较小的断层破碎带的识别能力，要强于波速成像方法。

The one-dimensional time-dependent Schrdinger equation was numerically solved with the symmetric splitting of the short-time exponential propagator and the fast Fourier transformation, and influence of intensity and pulse with on ionization of linear multi-ation molecular ion in two-color laser fields was researched.

利用短时指数传播子对称分割法和快速傅里叶变换技术，数值求解了一维含时Schrodinger方程，探讨了双色激光场中激光的基波和谐波强度之间的不同配比以及脉宽对线性多原子分子离子电离的影响。

The calculation result shows the velocity of heat and mass transfer is finite and has the characteristics of wave. The compare of the results of hyperbolic equation and those of parabolic equations shows there is a delay between both the thermal and the mass of the former and those of latter.

计算结果表明：在考虑热量传递过程的松弛效应以后，发现热量传递速度是有限的且具有明显的波传播机制，计算结果和由抛物型方程进行计算得到的结果进行比较发现不管是热量传递还是质量传递在时间上都有一个延迟。

Consequently, the numerical calculation methods of the propagation ought to be Lie group transformation too, which is known as Lie group method.

本文应用李群方法，系统表述相空间中的地震波和频率空间域中的单程波传播，并由此分别给出地震波场数值模拟和深度偏移的李群算法。

1 SIMPLE WAVE NATURE OF SOUND 2.1.1 Introduction to Longitudinal Propagation Wave motion or vibration is made possible by inertia and elasticity in a material.

2.1声音的简单波本质2.1.1纵向传播介绍波动或者说震动，是可以通过物体的惯性和弹力产生的。

He word "taboo" originated on the island off eastern Australia, Polynesia, New Zealand, and Melanesia. British exporer James Cook learned the word when he was sailing around the word in 1777, and the introduced it to Europe.

ABOO 一词起源于澳大利亚东部的波利尼西亚、新西兰和美拉尼西亚的岛屿上。1777年，英国的探险家JAMES COOK在世界航行的过程中学到了这个词，并在日后将其传播到了欧洲。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。