波的传播

Based on integral transformation, analytical solution for the wave transmission equations in 1-D inhomogeneous media is derived. By dividing the media into layers and considering the continuous conditions between the interfaces, the transfer matrix of amplitude of waves is obtained.

利用积分变换，用解析方法求解了一维非均匀区域的不同性质对弹性波传播时波幅变化的影响；将非均匀区域离散成均匀的薄层，结合相邻层的连续条件，建立了数值解法的波幅传递矩阵。

The results indicate that: the cavity radius becomes stable at approximately 6000μs;the blasting pressure waves mainly are transmitted horizontally;the peak pressure has a negative logarithm relationship with distance perpendicular to the charging bisector;and the valid influence area r.

应用ANSYS/LS-DYNA有限元程序对条形装药黄土地基中爆炸过程进行了三维数值模拟，发现在6000μs爆炸空腔已基本稳定，条形装药爆炸产生的压力波以水平方向传播为主，装药中垂线方向爆炸产生的峰值压力与离中垂线距离呈负对数关系，土的有效影响范围半径大约为爆炸后形成的空腔半径的4倍。

A few, though, break free—and such open-ocean waves are powerful and can travel great distances.

而极少的那部分亚重力波则会在没有任何约束的条件下支离破碎——这样的开放海洋波浪是强而有力的，并且能够传播到很远的地方。

In long wave limit, these elliptic function wave patterns may degenerate into single valued localized excitations dromion and multi-lumps.

椭圆函数传播波之间的相互作用是非弹性的，而在长波极限下相应相干孤子激发Dromion，Lumps之间的相互作用可以是弹性的，也可以是非弹性的。

Based on wave propagating in three directions of elastic foundation, vibrating displacement could be assumed to be in three forms along three directions. Hooke's law and theory of waves were adopted to deduce the formula of coupled viscous boundary. The coupled viscous boundary could be applied in finite element method.

根据波在地基的3个方向都可以进行传播的特点，假定了地基中质点沿3个方向的振动表达式，通过胡克定律和波动理论，推导了弹性地基中三维动力问题的耦合粘性边界的公式。

Based on the existed approaches of hydrometeor classification and the requirement of application in China,we construct a algorithm to classify the precipitation particles with the polarimetric radar observations,and make a comparison of polarimetric radar variables sensitivity Z_DR,K_DPand ρ_HV(0) in this model.

在综合分析国内外降水粒子相态识别方法的基础上，结合我国双线偏振雷达的应用需求，建立了一套利用双线偏振雷达探测资料识别降水粒子类型的识别模式，并根据美国KOUN雷达观测资料对该模式进行了分析验证，同时检验了模式中的几个偏振参数：差分反射率因子ZDR、差传播相移KDP、水平偏振和垂直偏振回波功率零滞后互相关系数ρHV(0)对不同降水粒子的识别效果。

First, we introduce the linearly distributed stress tensors as the source and by means of two-dimensional finite-difference scheme to obtain the response of this source, then the point source response is generated by correcting both the wave forms and geometrical spreadings for the linear respons.

但在理论地震学，工程地震学和勘探地震学中横向不均匀介质中的波传播问题非常重要，此时使用有限差分法和有限元法等离散数值方法比较有效。鉴于目前计算工具的限制，三维模型的有限差分计算虽然在理论上是可行的，但很少能用于实际。

Five this week, a major broker between the news spread:"The end of the year or before and after the Spring Festival, there may be a wave of price index, stock Please note that pre-or high-quality small stocks."

本周五，新闻与传播的主要经纪人说：&在今年年底或之前和之后的春节，有可能是价格指数，股票请注意前或高波小型优质的股票。&

By using dynamics analysis software RecurDyn to establish a model for the prototype of a belt conveyor, this essay reaches through simulation research the conclusion that during the initial startup phase, it is necessary to maintain a lag between the speed of the tail pulley and that of the head pulley, mainly because it takes a certain amount of time for the elastic wave to travel through the belt to reach the tail of the conveyor.

应用动力学分析软件RecurDyn建立了带式输送机的样机模型，通过仿真研究，得出在起动初始阶段，尾部滚筒速度要滞后于头部滚筒速度一定时间，这主要是由于弹性波在输送带中进行传播到达尾部需要一定的时间；并且在起动阶段，输送带的张力比稳定运行时变化大，起动时间越长，输送带出现的最大张力越小。

The subconscious mind is the "sending station" of the brain, through which vibrations of thought are broadcast.

潜意识则是人脑的&发射站&，借着潜意识的中介，思想的悸动振波才能广为发布传播。

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％。