fix position
6.Objective A method was established for the determination of paeoniflorin in Shiquan Dabu Capsule by TLC-UV. Methods Using TLC plate,a mixture of ethyl acetate:formic acid:acetic acid:water(30∶2∶2∶4)was used as developer,fix the position under the lightof a UV lamp(254 nm),detection wavelengthe was 230 nm.
8.Based on the network structure model of air defense multisensor network, the topological optimization problems of multisensor network is researched deeply, that is, when the position and number of unit nodes in network are known, how to fix on the position and number of network repeaters, and how to fix on the connection relations between repeaters and unit nodes.


