波

To better fit the lower amplitude P waveform, we employed two different weights for the P wave and surface wave arrivals, respectively. A grid search method was employed to find the strike, dip and slip of the earthquake that best fit the three-component records of P and surface waveforms recorded (the tangential component of the P-wave arrivals was not used). Synthetic waveforms were computed with an F-K method. Two crustal velocity models were used in the synthetic calculation to reflect a rapid east-west transition in crustal structure observed by seismic and geological studies in the study area.

为了更好地利用信号相对较弱的P波信号，对于一个地震记录，本文分别截取出P波和面波两个部分，分别给予不同的权重进行反演，结合格点搜索的方法，得到了与记录P波及面波三分量对应较好的地震的方位角、倾角和滑移角。

Finally, we prolongate the theory to two dimension tensor product wavelets space, proofing the best approximation property of product spline wavelets interpolation and constructing the parallel algorithm of the wavelets decomposition.

最后，我们继续将这一理论拓展到二维张量积小波空间，验证了乘积型样条小波插值的最佳逼近性质，进而在二维张量积小波空间构造了乘积型样条小波分解的并行算法。

The speeds of different kinds of stress waves(such as compressed stress wave and torsional stress wave) are unequal under coupled impact load. So the internal forces in structure are different between different areas, and the boundaries of these areas are changing with time.

在耦合冲击载荷作用下，注意到各种应力波(如轴向压缩应力波和扭转应力波)的波速不同，结构被分成若干区域，各区域的内力不同，且这些区域的边界随时间变化。

An image fusion scheme based on the wavelet transform and an image compression algorithm based on zero-tree coding are proposed, aiming at the demand of the Intelligent Transportation System. The algorithm is used to fuse visible image and infrared image with wavelet transform and then to compress the fused image by fully employing the importance degree of the subband coefficients and visual characteristic of mankind. So it enhances the integrality and oneness of the traffic information availably and also improves the quality of the system greatly.

针对智能交通系统信息采集的需要，提出基于小波分析的图像融合和零树编码的小波图像压缩算法，利用小波变换将红外和可见光图像进行融合，利用各子带小波系数对图像恢复的重要程度和人眼的视觉特性对融合图像进行压缩，算法的实际应用提高了所采集的交通信息的完整性、统一性和容错性，并改善了智能交通系统的服务质量。

Anisotropic waves have complex wave surfaces, and the triplication phenomenon is very common to the slow wave surface.

2各向异性波具有较为复杂的波前形状，慢波波前的三叉区现象是一种较普遍的波动各向异性现象。

A new approach for pattern recognition of ultra-high frequency signals of transformer partial discharge based on multi-scale analysis of wavelet packet and grid dimensionality is proposed, in which the multi-scale transform of wavelet packet is used to extract wavelet coefficients of UHF PD signals and by means of improving difference box-counting method the grid dimensionality of multi-scale wavelet coefficients is calculated and the multi-scale grid dimensionality is taken as the characteristic quantity that is used in the recognition of UHF PD signals.

提出了一种基于小波包多尺度分析和网格维数的变压器局部放电超高频信号模式识别的新方法，采用小波包多尺度变换提取局部放电超高频信号在多尺度上的小波系数，通过改进差盒计数法计算多尺度小波系数的网格维数，并将多尺度网格维数作为特征量用于局部放电超高频信号的识别。

Idas and marpessa presently arrived at a riverside,where idas put down his beloved to enjoy a bit of rest and food and drink.they spent the night in a temple nearby.when morning came,idas found that marpessa had been stolen by apollo.he ran after the immortal god-apollo,feeling quite ready to fight and die for his love.apollo held his unescapable arrows .idas went forward with his sword.the duel was about to start when suddenly they heard a thunder bolt round about,and zeus himself arrived to stop the unequal contest.he gave the maiden the choice between immorality and eternal glory on one side and on the other a mortal life of faithful love mixed with endless cares and griefs .fearing infidelity on part of a god ,marpessa turned down the sweet promises of apollo and chose for her companion in life one capable of a like fate.apollo left in bad spirits; idas felt on top of the world .

不久伊达斯和玛彭莎来到江边。伊达斯放下情人歇息以恢复精力。他们在附近一寺庙中过夜。早晨醒来，伊达斯发现阿波罗将玛彭莎偷走了。他追赶那长生不老的太阳神，准备与他的战斗，为爱情而献身。阿波罗握着百发百中的箭，而伊达斯手持短剑迎面而上。决斗即将开始。突然，他们周围响起了雷电声。原来是宙斯赶来制止这场不公平的决斗。宙斯让玛彭莎作出选择：要么长生不老，享受永久的荣耀；要么对爱情忠贞不渝，而过一种充满忧虑和悲伤的凡人的生活。由于怕神对爱情不忠，玛彭莎谢绝了阿波罗甜蜜的许诺。她选择了能同甘共苦的人作伴侣。阿波罗垂头丧气地走了。伊达斯则感到万分喜悦。

To obtain a complete picture about shock formation in non-viscous flow, in the succeeding chapter we investigate the isothermal shocks in adiabatic flows. We find that in this case the shock solution still exists, but the structure and the properties of the solution are greatly different from above even qualitatively. In some region of the parameter space there only exists unstable shock solution and in some region of the parameter space there may exist two stable shock solutions.

为得到完整的无粘流体中激波形成的图象，在接下来的第四章，我们研究绝热流体中等温作为激波条件时的情况，发现此时激波解仍存在，但解的结构和性质甚至在定性上都与前两章有了显著的不同：某些参数空间只存在非稳定的激波解，某些参数空间则会同时出现两个稳定的激波解。

In this paper, the basic principle and the power factor of conventional SERDS are discussed. Aiming at its shortage of low power factor, boost chopper type SERDS is adopted. The equivalent circuit of the new scheme is built up, and then vector diagram is used to analyze the power factor of the system, also the harmonic distortion of the system is discussed. The experiment device is established base on a 380F/7.5 kW induction motor and a passive soft switching scheme is applied in order to improve the working condition of IGBT. At last, the experimental results are shown.

本文在分析传统串级调速原理的基础上，对系统的功率因数进行分析；针对传统串级调速系统功率因数低的缺点，采用升压斩波式串级调速系统加以改进；建立了升压斩波式串级调速系统的等效电路并采用向量图法对该系统的功率因数进行详细分析；分析了系统的谐波情况；构建了以7.5kW／380V电机为调速对象的升压斩波式串级调速系统实验装置，给出相应的实验结果；针对斩波器中IGBT处于硬开关状态的缺点，应用无源无损软开关技术予以改善，包括对软开关电路工作原理的分析、参数的设计并给出相应的实验结果。

The interference of the incoming and reflected sound waves forms clear standing wave pattern in the tube.

在驻波演示管内，由扬声器发出的行波和反射面形成的反射波干涉形成物理模型清晰的驻波。

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％。