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     A FAST AND EFFICIENT COMMON CONVERSION POINT STACKING TECHNIQUE FOR CONVERTED WAVES
     快速有效的转换波共转换点叠加技术
短句来源
     Calculation procedures for common conversion points of PS converted waves and their application
     PS转换波共转换点的几种计算方法及实际应用
短句来源
     On the basis of the integral form of the P-SV wave DMO algorithm in F-K domain derived in the paper, the amphtude and pbase corrections are made, Compared with the conventional P-SV wave horizontal stacking, the method can obviously improve the stacking result and better solve the divergence problem of common converted points in CMP gathers.
     该方法依据文中导出的F-K域转换波DMO算法的积分形式进行振幅、相位校正,同常规转换波水平叠加相比能明显地改善叠加效果,更好地解决CMP道集内共转换点发散问题。
短句来源
     The Iterative Algorithm and Application of Common Converted Point Gathers
     共转换点道集的迭代算法及应用
短句来源
     The shear wave velocity determined by converted-wave velocity analysis is an important parameter for common conversion point(CCP) binning technique.
     利用转换波速度分析拾取的横波速度是转换波共转换点(Common Conversion Point简称CCP)叠加技术中很重要的参数.
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     Analysis of velocity at common-converted-point.
     转换点速度分析
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     CCP GATHERING FOR P-SV CONVERTED WAVES
     P-SV波的转换点道集抽取
短句来源
     d. and continued for 14 days.
     14 d。
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     d. and continued for 14 days.
     , 14d。
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     Transforming Bridge
     转换
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Even the substrates that had very little cleavage in the in vitro experiment were efficiently invaded in vivo, and were accompanied by a large degree of coconversion.
      


The solar cells are made of several kinds of nonsingle crystalline silicon that are now obtained in our country. The relations between the characteristic of the materials and the solar cell performances are analysed with the effects of the solar cells. The nonsingle crystalline silicon materials that suit to make solar cells shold be of large grains, (which should be≥1mm2)The grain-boundaries must be perpendicular to the sliced silicon surface, and the resistivity of these materials should be less than 40Ωcm....

The solar cells are made of several kinds of nonsingle crystalline silicon that are now obtained in our country. The relations between the characteristic of the materials and the solar cell performances are analysed with the effects of the solar cells. The nonsingle crystalline silicon materials that suit to make solar cells shold be of large grains, (which should be≥1mm2)The grain-boundaries must be perpendicular to the sliced silicon surface, and the resistivity of these materials should be less than 40Ωcm. The demand for the purification of materials may be relaxed. The photovoltaic efficiency of the solar cells made of these kinds of materials is 6-10. 5 percent.

用现有的几种多晶硅材料制造太阳电池,从电池的效果去分析材料特性与电池性能的关系,得出适合于太阳电池的多晶硅材料应是大晶粒的(晶粒要在mm~2以上),晶粒间界要垂直于片子表面,且电阻率要在40ΩCm以下。材料纯度的要求可放宽。用这样材料制造的太阳电池,共转换效率在6%~10,5%。

The stacking for P-SV Converted waves requires to determine the actual common reflecting points, namely Common Comversion Points (CCP). The CCP stacking for converted waves is much more complicated than the CDP stacking for P-waves due to the asymmetric ray paths. Given the velocity ratio of S-to P-waves, the depth of reflector and the offset, the horizontal distance between source and the converting point can be determined by solving a quartic equation. In this paper, we will show how the converting points...

The stacking for P-SV Converted waves requires to determine the actual common reflecting points, namely Common Comversion Points (CCP). The CCP stacking for converted waves is much more complicated than the CDP stacking for P-waves due to the asymmetric ray paths. Given the velocity ratio of S-to P-waves, the depth of reflector and the offset, the horizontal distance between source and the converting point can be determined by solving a quartic equation. In this paper, we will show how the converting points for P-SV waves on subsurface interfaces and the distribution of the convening points/ receiving points on the surface are determined so as to appropriately categorize the data for CCP gathering.

P-SV转换波的叠加必须知道真正的共反射点。 这个共反射点就是所谓的P-SV波共转换点。由于P-SV转换波对线的不对称性,它的叠加比纵波的CDP叠加要难得多。如果我们已知介质中横波与纵波速度的比值、水平界面的埋藏深度和炮检距,炮点到共转换点的水平距离就可以通过解一个四次方程求出。本文将讨论如何确定P-SV转换波的转换点并分析P-SV波在地下界面的反射点和地面接收点的分布,从而提出动态抽取共转换点道集并实现CCP叠加的方法。

The stack of converted wave requires real common conversion point(CCP) gathering.When medium is horizontally layered,CCP coordinates can be determined by using the analytic expression that is derived in the ease of single uniform layer. However,in practical application,the analytic expression is too tediously long and causes much computation,and its parameters show indistinct influence on CCP coor- dinates.What is more,it is very difficult to derive such analytic expression in the case of slant interfaces. An...

The stack of converted wave requires real common conversion point(CCP) gathering.When medium is horizontally layered,CCP coordinates can be determined by using the analytic expression that is derived in the ease of single uniform layer. However,in practical application,the analytic expression is too tediously long and causes much computation,and its parameters show indistinct influence on CCP coor- dinates.What is more,it is very difficult to derive such analytic expression in the case of slant interfaces. An iterative algorithm for CCP locus is derived in the case of single uniform layer.The algorithm leads to fast calculation,accurate result and rapid convergence. If the iteration result of a depth point is used as the initial value of the next point,a single iteration usually makes the relative error much smaller than 0.1%.This algo- rithm is seven times faster than the original one.This algorithm is expressed by a concise formula,from which people can see how velocity ratio and offset/depth ratio influence CCP coordinates.Essentially,this iterative algorithm can be easy applied to the case where reflectors slope down.

转换波数据的叠加要求真正的共转换点选排。当地下介质为水平层状时,其共转换点(CCP)坐标可通过在单个均匀层情况下导出的解析表达式来近似地确定。然而,对实际应用来说,这个表达式显得很冗长、计算量大,式中参数对共转换点坐标的影响关系也不明显。而且,当地下反射界面为非水平时,建立这样的解析表达式将十分困难。本文在单个均匀层情况下,导出了一种转换点轨迹的迭代算法,该算法运算速度快、精度高、收敛快。如果用前一个深度点的迭代结果作为后一个深度点的迭代初值.一般只需迭代一次便可使相对误差远远小于0.1%,其运算量可比原解析表达式算法提高近7倍。该算法的表达式简单,且从中可以清楚地看到速度比及炮检距与深度之比对 CCP 坐标的影响关系。最主要的是,这种迭代算法很容易推广到地下反射界面为非水平的情形。

 
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