利用多极子阵列声波测井资料提取直达斯通利波、计算斯通利波中心频率偏移和时间延迟来进行地层渗透率反演的方法已被研究了多年。
In this paper, developed are a method and correspondent software for calculating formation permeability from the center frequency shift and travel time delay in direct Stoneley wave.
作为直接推论给出了中心阶乘数反演关系的新证明。
As immediate consequence of our results we give a new proof of the inverse relations of central factorial Numbers.
圆的反演：反演成一圆。但当圆通过反演中心时变成一直线。
Inverson of circle: Into a circle, if the circle pass through inversion center o, it becomes a straight line.
圆的反演：反演成一圆。但当圆通过反演中心时变成一直线。
Inverson of circle: Into a circle, if the circle pass through inversion center o, it becomes a straight line.
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