波的传播

PartⅡ,Applying the developed and extended direct algebraic methods that presented in recent years and based on the 2+1 dimensional variable separation solutions,abundant Jacobi elliptic function doubly periodic waves and periodic propagating wave patterns for many 2+1 dimensional nonlinear wave models are obtained,and in long wave limit solitary waves are derived as well.

第二部分，本文拓展和推广(来源：a2AB7aC论文网www.abclunwen.com)了新近发展的几种典型的直接代数方法和基于分离变量解的间接方法，获得多个2+1维非线性波动模型丰富的雅克比椭圆函数双周期波解和周期传播波模式，并得到长波极限情形下存在的非线性孤立波。

Phase and group velocity are the important parameters for researching seismic wave propagation and describing the media property, and they are key contents in theory of elastic wave propagation and play a role in theory and application.

相速度和群速度是研究地震波传播规律和描述介质特性的重要参数，是弹性波传播理论中的核心内容，在理论研究和实际应用中有重要作用。

It is based on the interaction of stress wave in medium and the law of reflection and penetration when stress wave encounters an interface of dissimilar medium or an unequal section.

本文利用工程中可实际运用的一维线性应力波理论，以应力波在介质中的相互作用及其在不同介质界面和不等截面上的反射和透射机理为基础，通过建立合理的由不同材料组成的力学模型，详细探讨了在炸药爆轰这一极其短暂的过程中，主要载荷参数、结构尺寸参数和材料参数等诸多制约因素对子母弹开仓过程和应力波传播的影响规律。

The surface waves propagate with a phase velocity which is always less than the velocity of ectromagnetic waves in free space.

面波传播速度的阶段，始终是比ectromagnetic波在自由空间速度减少。

The main member that attends this meeting has Yang Li of director of research center of Internet of office of news of the State Council wave of Li Song of CTO of news of news of university of division, China politics and law and transmission prexy Song Jianwu, the Chinese Academy of Social Sciences and Min Dahong of transmission institute researcher, sina, cruel 6 websites CEO, the Ma Xiang of famous network compere of billow of seminar origin make a fresh start takes on chair.

参加此次会议的主要成员有国务院新闻办公室互联网研究中心主任杨理科、中国政法大学新闻与传播学院院长宋建武、中国社会科学院新闻与传播研究所研究员闵大洪、新浪CTO李嵩波、酷6网站CEO李善友、艾瑞咨询高级副总裁阮京文以及精品报业集团常务副总编、精品网董事长王明亮和精品网CEO胡紫微等人，研讨会由来自新浪的著名网络主持人马骧担当主持。

The wave is allowed to propagate along the symmetric principal direction as well as along off-principal-axis direction.

波既可以沿平行于主轴的方向传播，也可以沿偏离主轴的方向传播。

Two of the most predominant characteristics of Surface Wave are Dispersion and Attenuation which ar...

频散和衰减是面波传播中的两个基本特征，利用面波频散和衰减可以有效地研究地球内部速度结构和粘弹性结构。

After graduation, he continued to work at the same institute, engaged in the research of shock wave propagation in solids, hyper-velocity impact and shock wave consolidation. He obtained PhD in applied mechanics from the University of Cambridge in 1998 with a thesis about constitutive relations and elastic waves for cellular solids modeled as a micropolar solid.

毕业后继续在力学所从事高温高压下固体中冲击波传播、高速冲击及爆炸冲击波压实金属粉末的机理研究。1998年获英国剑桥大学应用力学博士学位，论文研究胞状固体材料本构关系及微极材料中弹性波传播的问题。

In the open ocean, due to very long wavelengths, the wave height is small (only 1-2m), this wave is not rough, but the spread of to near coastal areas, due to the gradual shallowing water depth, seabed resistance is increased, wave deformation, wave height increases rapidly (up to 10 meters), will be the formation of waves rushed into the land.

在开阔的大洋中，由于波长很长，波高不大（仅1—2m），这种波浪并不汹涌，但传播到接近海岸地带，由于水深逐渐变浅，海底阻力加大，波浪变形，波高急剧增大（可达10余米），便形成巨浪冲向陆地。

The computationally efficient degenerate migrators extend the splitstep Fourier method to steeper propagation angles in largecontrast media at the cost of one more Fourier transform for each extrapolation step.

这种退化偏移算子只用快速Fourier变换进行波场延拓，将常规的Fourier分裂步地震偏移方法推广适应强速度横向变化介质和大角度传播波场。

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％。