本文建立了龙胆类生药中五种苦甙类成分,即:龙胆苦甙(gentiopicroside),当药苦甙(swertiamarin)、当药甙(sweroside)、苦龙胆酯甙(......

[目的]采用反相高效液相色谱法对抱茎獐牙菜中当药黄素的含量进行测定。[方法]色谱柱为Kromasil C18（250min×4．60mm，5μm），流动相......

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The purpose of this article is to remind of the past and present problems of creating single wire electrical systems. Th......

The main goal of this article is to compare traditional three phase system with one wire three-phase system. There are s......

This article is an attempt to answer student’s (and not only students’) questions about the possibility of inventions ......