An improvement was made in grouping to find the integrating factors, so that those for some differential equations will be worked out mainly by integration.

本文对用分组法求积分因子做了一些改进；从而使一类微分方程的积分因子，主要通过积分的运算就可以得到。

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With the improvement of Marine power supply network and high requirement of the selective protection, longitudinal differential protection has more practical meaning in Marine power system.

随着船舶供电网络结构复杂程度和选择性保护要求的提高，将纵差动保护应用于船舶电力系统有着越来越大的实际意义。

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It is shown that a phase variation of the nucleon-nucleon elastic scattering amplitude leads to a large increase in the calculated differential cross-section and a substantial improvement.

计算结果表明核子-核子弹性散射的位相变化使理论微分截面增大，改进了理论值与实验数据的符合。

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