反像

In the surveys, some very closely spaced survey lines displayed remarkable differences in crustal structure. To find the reasons for the differences and to analyze the reliability of crustal structure, ocean bottom seismometer data from the west and east sides of the Dongsha Islands were reprocessed and inverted with tomography technique. The routine processing and inversion procedures include clock correction, position correction, finite-difference ray-tracing-based tomography, checkerboard test and comparison of the inverted crustal model with initial models. As a key step, we analyzed the lateral velocity resolution and smoothed out the short wavelength velocity variation which maybe most probably artifacts in the final velocity models.

在一些相隔很近的测线上，探测的深部地壳结构却相差较大，为了分析这些探测结果中差异的原因和地壳结构变化的可靠性，本文以东沙东侧海域测线和东沙西侧海域测线为例，对采集的海底地震仪记录进行了时间、位置校正和初至波走时拾取，利用有限差分地震走时层析成像进行了走时反演，获得所在剖面的地壳速度结构，并分析了模型的横向分辨率，剔除模型中短波长的横向速度变化。

Just like your anti-virus, you have to keep your firewall up to date.

就像你的反病毒程序，你要保持你的防火墙是最新的。

In order to develop this local property,this paper presents a method,which uses Fourier Series to approximate the boundary shapes of the shafts with periodic boundary of cross section,and uses the conformal mapping in Theory of Function of a Complex Variable to make the complicated boundary shapes of the shafts map a unit circle.Thus elastic theory can analyze...

本文提出一种方法，其实质是：采用富里埃级数来逼近横截面呈周期性变化边界的轴类零件的边界形状；并应用复变函数论中保角映射原理，将零件复杂的边界形状映像成单位圆，从而使弹性理论可以分析和计算复杂边界轴类零件的应力场；再通过留数的求解实现保角映射的反变换。

The 20-year-old takes it all in good heart and his tendency to good-naturedness is seen by some as a sign of subservience. People should know him better by now. He is working on improving his demonstrable strengths, the service action has been modified and has brought him more accuracy and power, his forehand is showing signs of being at its imperious best and, as he put Arnaud Cl ment, of France, to the sword in the second round here, only the fragility of his backhand was a concern.

一年半远离职业赛场让卡纳斯并不怵费德勒这位当今球王，在比赛中打得更主动的反而是阿根廷人，卡纳斯不但能够适时来到网前向费德勒施压，即便在底线相持中处于下风，他还是会每球必争地拖垮费德勒的节奏，于是比赛多次出现了费德勒在卡纳斯的顽强救球下出现主动丢分的场景，这一点颇像过去纳达尔和费德勒交锋时的场景。

The usual travel time tomography method is based on geometrical ray theory,however,it assumes that the seismic wave has very high frequency,which often makes the tomographic inversion have ill posed problem because of the sparse ray distribution in the model space and finally affects the reliability and resolution of the tomographic results.

基于几何射线理论的旅行时层析方法假设地震波频率足够高，这样往往由于射线存模型空间的稀疏分布，使层析反演问题具有严重的不适定性，从而极大地影响层析成像结果的可靠性和分辨率。

His promotion looks ill-judged, given that many in the United States Congress want tougher human-rights conditions attached to American anti-drug aid to Mexico.

鉴于美国国会中多数人希望美国对墨西哥的反毒品援助能在一个更稳固的人权环境中进行，阿托罗·查韦斯的任命看起来像是判断失误的结果。

The retrieval precision of atmospheric correction in some degrees depends on the validity of model inputs. But obviously, the input parameters can not be satisfied due to the model input is very complex and indeterminable i.e.

大气订正模型反演精度的高低从一定程度上来讲依赖于模型输入参数的正确性，然而对于大气辐射校正模型来说，其输入参数是成像时刻的大气状况，显而易见这是无法精确获知的。

In every period, do the following operations:# For each 8*8 block, do the discrete cosine transform, then take out direct current coefficient in each block, using the transformation above for each DC coefficient, the gold stands for the code of the spread-spectrum we use when embedding the different watermark bit in different frames, after all of the watermark information which we want to embed is embedded, then do the inverse discrete cosine transformation, and store the current frame in a new file.

于是利用DCT变换域的这点重要的几何不变性，我们可以推导出一种能够抵抗几何攻击的视频水印算法，即将所需要嵌入的水印信息以127位扩频序列作为辅助，以求和值形式嵌入到DCT变换后的每个宏块的每个DC系数当中，具体嵌入和提取算法如下：根据使用的扩频序列的长度N，基于相关的嵌入器需要选取包含N帧的视频子序列，令这N帧视频子序列作为一个嵌入周期，对于每N帧视频子序列做如下的操作，#即对于每个8×8的像素块进行DCT变换，然后取出每个DCT变换后的直流分量，对于每个DC系数，做如上所述的变换，其中gold为在第k帧中嵌入第i位水印信息时使用的扩频码字值，待将所有需要嵌入的水印信息全部嵌入后，再做反DCT变换，保存当前帧。

The basis of complex structure imaging is establishing velocity model, the velocity inversion is a nonlinear problem.

建立速度模型是复杂构造成像的基础，而速度参数反演问题本身是非线性的。

Based on the 3-D acoustic equation and Tarantola′s generalized inversion theorem, taking into consideration the character of cross-well survey, a 2.5-D cross-well waveform tomography method in the frequency domain is presented here.

从频率域3-D声波波动方程出发，结合井间观测方式的特点，基于Tarantola广义反演理论，提出了一种频率域2.5-D井间波形层析成像方法。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。