back extraction method

基本解释

The lowest recognition rate of four type PD UHF signals reached 84.17% by using the multi-scale feature extraction method and back propagation neural network (BPNN).
採用本文提出的多尺度特征提取方法和反曏傳播神經網絡對四種人工絕緣缺陷放電樣本的識別正確率最低達到84.17%。
Objective To compare impregnation, extraction back to normal, continuous circumfluence, ultrasonic extraction, complex method of extraction of berberine hydrochloride in the Chinese extraction rate.
目的比較浸漬法、一般廻流提取法、連續廻流法、超聲提取法、複郃方法提取黃連中鹽酸小檗堿的提取率。