波的传播

Different types of waves have already been considered. There was the longitudinal wave caused by the pulsating sphere, where the changes of density were propagated through the medium.

我们已经研究过几种不同的波，其中有由圆球的脉动所产生的纵波，它的密度的变化由介质传播。

The vibration can produce many kinds of mechanical waves which spread outside with the electromagnetic wave as the medium.

由于万有引力和万有旋转力的存在，太阳始终受到多个变力的作用，所以它将不停的进行着多个振动，变力的作用将使太阳周围存在着电磁波，并且产生巨大的能量，而多个振动会产生多种机械波，并且会以电磁波为媒介向外传播。

In the last few years, researches the problem of the underwater sail machine's sound have been common, the content of the research is very extensive, including the modeling, method of its solution, frequency curve, the wave's property in spreading, the syntonic frequency and the damp material on such coupling system.

近几年，水下航行器的声振一直是国际上研究的热点，研究的内容非常广泛，其中涉及这类耦合系统的建模、求解方法、频散曲线与传播波性质、外激励下的共振频谱及阻尼材料降噪等。

Tertiary waves are seismically generated acoustic waves that can propagate over great distances in the SOund Fixing And Ranging channel. On 2004/12/26, big Sumatra earthquake ( Mw =9.3) occurs at the Sumatra island. A huge tsunami excited by the energy from the big Sumatra earthquake causes a great lose, thus a lot of scientists from all over the world pay a lot attention to such big Sumatra earthquake.

T-波是由海底地震或者海陆边界俯冲带附近地震激发，并在海洋低速层中传播的声波。2004年12月26日，在印度洋东部印尼苏门答腊岛附近发生 MW =9.3级大地震，其产生的能量在印度洋中激发了巨大的海啸，造成了严重的人员伤亡和财产损失，受到了世界科学家们极大的关注。

Besides various interferences, the wave front diffusion, the ground absorption and the attenuation are all the causes of a weak seismic reflection and, plus the complicated superficial geologic setting and the reservoir bed features of low amplitude, low porosity and low permeability of the compacted thin detrital rock in HJQ, the conventional seismic amplitude fidelities do not meet the criteria of the seismic inversion.

除各种干扰外，地震波传播过程中的波前扩散、大地吸收、衰减等使地震反射能量变弱，加之杭锦旗地区复杂的表层地质条件和低幅、低孔、低渗致密性薄层碎屑岩的储层特点，使常规保幅地震资料离地震反演的要求还有差距，并且反演技术本身不具备噪音识别功能，包含噪音的反演必然会影响地质效果。

The numerical results of stationary and transient Green'sfunction for high-velocity surface-head wave on some selected crystals are comparedThrough the above analyse,it is indicate that the first arrival wave mode is thelongitudinal-wave head-wave,and its propagate velocity is equal to the groupvelocity of the longitudinal bulk wave alone the surface.Furthermore,this modedoes not have the Δv/v effect,i.e.,its velocity is the same no matter the surface isfree or metalized.

通过对表面激发的瞬态和稳态Green理论分析和数值计算，表明在压电晶体表面上实际上看到的最高速的最先到达的波动模式是纵波头波，它具有沿表面纵波的群速度，而且对压电晶体，它不具有Δv/v效应，即在自由表面和金属化表面其传播速度是一样的，而压电晶体表面波及伪表面波均存在Δv/v效应。

Due to the particularity of the blasting seismic wave ,the paper firstly introduce formation and categories of seismic wave and the way how to gather and pick-up signal of blasting seismic wave.in addtion , it also introduce two ways——frequency spectrum and wavelet theory to dispose and analyse the signal.

鉴于爆破地震波的特殊性，本文首先介绍了爆破地震波的形成和种类，爆破地震波信号的采集和提取以及对采集信号进行处理的两种分析方法——频谱分析和小波理论，接着针对云南小湾水电站的爆破震动测试对爆破地震波的特点以及传播规律进行了归纳和总结，并通过回归分析对经验公式进行了修正。

It is indicated that the Kelvin wave with large amplitude will have more important effect on response pro- cesses as well as the perturbation move eastward.

指出，由于西边界将激发出振幅大的Kelvin波，以及激发出能形成动力边界层结构的Rossby短波，这种结构使来自风应力的能量可在边界附近聚集和维持，并向东传播，表明了热带西太平洋对El Nio事件的形成和发展较热带东太平洋更为重要，因为后者只激发非色散的 Rossby长波。

But the pigs are often exhausted and put on a pig the only honorable man posture.

王小波所虚构的艺术之美，以及他通过对现实世界的批评所传播的自由主义理念，已经在这个世界的文化和思想宝库中占据了一席之地，虽然并没有一个像诺贝尔文学奖之类的证书来印证这一点，但是，我相信，时间就是他作品价值的证书。

Based on our formula of width equivalence of SIW and RW, the formula of length equivalence of SIW and RW has been derived, which is expected to find wide applications in the engineering design of SIW filter and resonance cavity.

根据已知的SIW和RW之间的宽度等效公式，通过对传播常数的分析，推导出SIW和等效的矩形波导之间的长度等效公式，这个公式在计算SIW短路结构和谐振腔时很实用。

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％。