波的传播

The rules of the propagating behavior of stress wave and the phenomena of stress concentration have been analysed. The crack rules of the firing pin have been studied and corresponding improvement methods have been proposed.

分析了击针受撞击时应力波传播的规律和应力集中现象，揭示了击针断裂的规律并从理论上和实践上给出了改进方法。

Tumbling flow is appeared in this fishway which produces wave surge and continues to flow downward and may causes serious damage due to its behaviour of periodic tumbling action.

在这种鱼道中出现的滚动流将产生波涌，并继续向下传播，而且它的周期性滚动可能会严重危害鱼道。

The pulse propagation through fog medium is discussed .The pulse distortion induced by fog is found using method of closed solution for Fourier integral in time domain. It is found that the pulse distortion is affected by the visibility, frequency, pulse width and path length.

在此基础上应用傅立叶时域积分近似解方法对脉冲波通过雾媒质时的传输特性进行了研究和分析，给出了脉冲畸变、频移随频率、能见度及传播距离的变化关系。

Variations of attenuation coefficients with rain rate for MP and LP model are compared under Mie theory and Rayleigh approximation. The approach to the solution of the Fourier integral in closed form is adopted for pulse propagation through rain medium .

在此基础上应用傅立叶时域积分近似解的方法研究了毫米波段脉冲波通过雨介质时，脉冲畸变随频率、降雨率、传播距离及脉冲宽度变化的关系。

The static correction study because of the hypsography, the surface low, falls the speed belt lateral change to the earthquake wave transmission influence, and carries on the correction to it, causes the reflected wave distance curve approximately is a smooth hyperbolic curve.

静校正就是研究由于地形起伏，地表低、降速带横向变化对地震波传播的影响，并对其进行校正，使反射波时距曲线近似为一条光滑的双曲线。

By solving the frequency equation,the relationship between initial stress and phase velocity is obtained.

通过求解考虑初应力时的耦合波动方程，得到了管道壁中应力波传播时相速度和初应力的关系，并进行了实例计算。

Every known wave spreads with some definite velocity, and so should a wave of light.

每个人都知道波是以某种确定的速度传播的，光波当然也是这样。

A theoretical model is developed to simulate the dynamic load transfer between the actuators and the host medium and the resulting elastic wave propagation.

建立一个理论模型来模拟致动器和母体之间的动态载荷传递以及产生的弹性波传播。

Finally, the author sums up the research efforts in this thesis and gives prospects of the application of stress wave propagation in orthotropic fluid-saturated porous media.

最后，作者总结了全文的工作，并对各向异性液饱和多孔介质中应力波传播问题的研究作了展望。

Firstly, this paper designs a polar coordinate barotropic vorticity equation semi-spectral model and a quasi-geostrophic grid model in order to research the propagation of vortex Rossby waves and tropical cyclone intensity change entirely.

本文首先设计了一个极坐标系正压涡度方程的半谱模式、一个准地转格点模式对涡旋Rossby波传播和热带气旋强度变化进行了较为系统的研究。

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％。