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In shoaling process, the main peak frequency of broken wave spectra moves to lower frequency. With decreasing relative water depth, both the ratios of wave spectral energy at twice and triple peak frequency to main peak frequency increase. and when the value of the nonlinear parameter increases, both the ratios increase, too. The Stokes third order wave theory has the same tend but overestimates the value quantitatively.

波浪浅化时，碎波后主频频率有往低频移动之现象，且波浪进入浅水区，相对水深减小，非线性参数Ursell number越大时，二倍主频及三倍主频与一倍主频能量比值均有增加之现象，与 Stokes三阶理论有相同之趋势，但实验之比值在定量上小於Stokes三阶理论值。

Regarding to the Mechanical wave on Physics teaching, the traditional method usually fail to offer a direct and clear description and demonstration on the effectiveness of Mechanical wave, for this reason the MathCAD software has been adopted, with the various functions the MathCAD software offers, such as calculation, function chart drawing and cartoon designing, men can describe and demonstrate exactly how the Mechanical wave transmits, intervenes and superposes, and define and research the Doppler effect.

物理学在处理机械波的教学过程中，传统方法读其现象的描绘和演示不直观也不方便，现利用MathCAD提供的强大数值计算、函数图像创建和快速灵活的动画设计功能对机械波的传播、干涉和迭加进行了精确描述和动画演示，并对阻尼

In a radio wave absorber (10), four hollow tetrahedrons (20) each of which has one open surface are connected such that a surface (20a) opposed to the open surface of the hollow tetrahedron (20) forms a side of a hollow pyramid (22). The radio wave absorber (10) is composed of a radio wave absorbing member shaped like a thin plate.

该电波吸收体(10)呈按照下述方式连接而形成的形状，该连接方式为将4个一面开口的中空四面体(20)以开口面相对的面(20a)作为中空棱锥(22)的侧面的方式形成。

This research is to use conductive fiber to be an electromagnetic-wave absorption screen layer. This theory of electromagnetic-wave absorption is based on the knitted structure, which enables the electromagnetic-wave interference, diffraction and reflection on the screen layer effective.

本研究主要利用导电损失的导电性纤维，制作为平纹针织结构作为电磁波吸收体之护幕层，此部份的电磁波吸收原理是利用针织物特殊之材料结构性质使护幕表面达到有效之电磁波干涉、绕射、多重反射之衰减。

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。

The article mainly describes the properties of millimeter wave, millimeter wave sources and millimeter wave multiplier's nowadays development at the first chapter. It also analyses several common multiplying methods associated with the subject's requirement and the realistic conditions according to which a proposal is confirmed that three-stage cascade connection fulfill 8 times multiplying.

本文综述了毫米波特点，毫米波源、毫米波倍频器的发展现状，分析了几种通常采用的倍频方式，并以此为依据结合课题需要和现实条件确定了采用三级级联倍频实现八次倍频的方案。

Regarding to model 1, firstly analyzes and studies principle as well as formation of detonation wave, the internal flow field structure of the detonation chamber. Then study the flow field structure near the outdoor of the detonation chamber, backflow process of the dilatation wave after detonation wave reach the outdoor and the change of thrust wall pressure and so on.

对于模型1，首先分析研究爆震波在爆震室内形成传播机理和爆震室的内流场结构，然后研究爆震波传出爆震管以后爆震管出口处的流场结构，膨胀波的回传过程以及推力壁压力随时间的变化等。

After three years'' effort, the item went through with two phases:the first phase is to make multi-wave observation experiments on one organic glass cylinder that simulated the train axle and its diameter is 64mm with one aspect has scare at the 60mm on the cylinder;the second phase is to make multi-wave observation experiments on the train axle,and exploit the three-dimensional imaging software of the multi-wave computing detection automatic searching the crack.

项目组经过三年努力，分两阶段进行：第一阶段在&有机玻璃圆柱体模型&（模拟车轴，直径64 mm）上作试验；第二阶段在&有伤实物车轴模型&上作试验，分别获得&多波检测计算机自动识别伤三维成像软件系统&，用此软件系统分别在两模型上作试验，其结果与实际模型一致。

In this paper an algorithm of finite element modelling is discussed for elastic wave propagating in two dimensional media. Two analytical formulas of the initial motion and wave form of P wave are derived in time domain for a point force source directing vertically down as a function of time with a bell shape.

本文讨论了二维介质中弹性波有限元模拟的一种方法；导出了二维无界空间中集中力点源的理论初动表达式和位移波形表达式，并和相似情况下的有限元结果进行了比较；对用有限元方法算得的几个中小模型的节点位移进行了分析。

The wave velocity ratio vertical to the stratum of the rock samples is usually less than that in parallel direction, and the relative increment of wave velocity ratio between the vertical direction and the parallel direction decreases as the wave velocity ratio in vertical direction gradually increases.

波速比的各向异性特征主要表现为垂直层理方向上的波速比普遍小于平行层理方向，且两方向波速比的相对增量还随着垂直层理方向上的波速比的增大而逐步减小。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。