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Chen Fu-Shan,Xie Lai-Su,Wang Hai-Yi,Long Yan-Quan Tianjin Universi 한국펄프·종이공학회 1999 한국펄프종이학회 기타 간행물 Vol.- No.-
Amphoteric polymers have brought to papermakers' attention gradually. In this paper, a series of amphoteric starches with different cationic and anionic degree of substitution (DS) are prepared. Better product has been selected and used under different condition.<br/> As retention and drainage aids, amphoteric starches were used in 'shorter fiber length, weak strength and poor drainage bleached AQ-Soda wheat straw pulp. In neutral and alkaline papermaking system, when amphoteric starches contain 0.024anionic degree of substitution (DS), it is shown that the higher the cationic degree of substitution (DS) in amphoteric starches, the better the filler retention. The filler retention is improved 12.5%. 30.3%, and 35.1 % and 32.5% respectively by adding 1 % amphoteric starch LS-L2 -I (0.034), LS-L2-2 (0.040). LS-L2-3 (0.047) and LS-L2-4 (0.052). But the strength of handsheets is affected a little. By adding 2% Al2 (S04) J and 1.5% LS-L2-3 at pH 7.5, filler retention can be improved from 38% to 80%. and breaking length of sheet only decreases 3.2%. As dry strengthening aids, amphoteric starches were used in eucalyptus APMP. Amphoteric starches are used in eucalyptus APMP. The amphoteric starch LS-L2-2 is better dry strength aid. Adding 1% LS-L2-2 can improve breaking length 24.5%. burst index 42.9%. tear index 38.8%. folding endurance and density of the handsheets.
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Discrete Time Modeling of Wireless Power Transfer System Using LCC Compensation Topology
Xiufang Hu,Yue Wang,Shuangqing Lv,Xiaoshuai Dong,Tianjin Chen,Yongbin Jiang,Pengfan Xu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In recent years, wireless power transfer (WPT) technology has developed rapidly. However, conventional modeling methods for the dynamics of WPT suffer from the order increase problem and complicated derivations and expressions. In this paper, a discrete time modeling method is used for wireless power transfer systems which use magnetic resonant coupling. The proposed method aims on the dynamics of the overall WPT system, including the nonlinear inverter and rectifier. The orders of the developed models are lower than that of the generalized state space averaging method and the extended describing functions technique. Control to output voltage small-signal behaviors predicted by the discrete time model are verified by circuit simulation results.
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