如果181壳单元输入确定的壳截面类型，任何实常数定义将被忽略。

If a SHELL181 element references a valid shell section type, any real constant data specified will be ignored.

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对于完全压实的地层，压实常数为1.0；未压实的地层，压实常数小于1.6。

The compaction constant is 1.0 for a completely compacted formation and less than 1.6 for an uncompacted formation.

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微分散射截面的变化主要依赖于相对介电常数实部、虚部数值较大的一方，并且随粒子取向角的增大而增大。

The variation of DSCS depends on the larger part between real part and imaginary part of dielectric coefficient. The DSCS and azimuth angle are in proportional relation.

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