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      • Direct Torque Control for Induction Machine based on AC-AC Matrix Converter

        Guo Yougui,Zhu Jianlin,Chen Caixue 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

        The combination of matrix converter with direct torque control is a way towards green energy-saving of the world. It has great sense for theory research and good developing future. First, it is analyzed about working principle of matrix converter, the control principle and its realization process of direct torque control for induction machine inverterbased. Then the comprehensive switching control table is deduced according to the special properties of matrix converter together with direct torque control for induction machine. And the comprehensive modulation strategy can be concluded by looking up the table. Third, the simulation model is set up. The simulation results have verified the feasibilities and advantages of this novel alternative current adjustable speed system. Finally, an adaptive fuzzy PI controller was designed to improve the electric magnetic torque of induction machine.

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        Authentication of an Endangered Herb Changium smyrnioides from Different Producing Areas Based on rDNA ITS Sequences and Allele- Specific PCR

        Xiaoqin Sun,Yueyu Hang,Yanglian Wei,Minjian Qin,Qiaosheng Guo,Jianlin Guo,Yifeng Zhou 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.4

        The rDNA ITS region of 18 samples of Changium smyrnioides from 7 areas and of 2 samples of Chuanminshen violaceum were sequenced and analyzed. The amplified ITS region of the samples, including a partial sequence of ITS1 and complete sequences of 5.8S and ITS2, had a total length of 555 bp. After complete alignment, there were 49 variable sites, of which 45 were informative,when gaps were treated as missing data. Samples of C. smyrnioides from different locations could be identified exactly based on the variable sites. The maximum parsimony (MP) and neighbor joining (NJ) tree constructed from the ITS sequences based on Kumar’s two-parameter model showed that the genetic distances of the C. smyrnioides samples from different locations were not always related to their geographical distances. A specific primer set for Allele-specific PCR authentication of C. violaceum from Jurong of Jiangsu was designed based on the SNP in the ITS sequence alignment. C. violaceum from the major genuine producing area in Jurong of Jiangsu could be identified exactly and quickly by Allele-specific PCR.

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