The article analyses original methods of DGA fault diagnose, include three-ratio method, artificial neural network method, Fuzzy Theory, diagnosing expert system, grey relational algorithm, et.

本文分析了原有的DGA故障诊断方法，包括三比值法、人工神经网络法、模糊理论、变压器诊断专家系统、灰色关联算法等。

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According to the basic principle in uranium series disequilibrium, a calculating method for the mixing ratio of a three source recharge system of groundwater is raised.

在论述铀放射系不平衡原理的基础上，提出了地下水三元补给体系混合比的面积坐标算法。

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Three additional displacement ratio calculating methods, i. e., the first mode method, elastic time history analysis method and calculating plane end displacement method, are suggested.

提出了三种计算结构位移比的补充方法，即第一振型法、弹性时程分析法和推算平面端部位移法。

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