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- 저자 : Ma Boyan (검색결과 2 건)
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Yanfang Ma,Zhihang Zhao,Boyan Tang,Yonggang Wu,Hailei Zhang 한국고분자학회 2020 Macromolecular Research Vol.28 No.10
We demonstrate the use of a supernormal valence transition-metal (Ce(IV) and Cu(III))-mediated redox system for the surface grafting on the halloysite nanotubes (HNTs). Following this way, commonly-used vinyl monomers were grafted on HNTs in one step under mild condition. The grafting was evidenced using FTIR, X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). The micromorphology was carefully characterized by transmission electron microscope (TEM). The results indicate that the surface grafting reaction was successfully processed in all cases, in which the Ce(IV) shows a much higher initiation activity than that of Cu(III). Then a uniform hydrogel was constructed by mixing poly(triethyl(4-vinylbenzyl)phosphonium chloride-grafted HNTs (HNTs-P(Et-P)) with sodium polyacrylate-grafted HNTs (HNTs-P(AA-Na)), which show desirable antibacterial activity.
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Maximum Power Point Tracking for Photovoltaic System Based on IMVO Algorithm
Wu Zhongqiang,Cao Bilian,Hou Lincheng,Hu Xiaoyu,Ma Boyan 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
The power output curve of the photovoltaic (PV) array exhibits multi-peak characteristics under partial shading conditions, and the traditional control algorithm cannot track the maximum power point continuously and accurately, therefore, a global maximum power point tracking method is proposed based on the improved multi-verse optimization algorithm. Spiral update and adaptive compression factor are introduced to enhance the global search capability of algorithm; the travelling distance rate update method is changed, and the convergence speed of algorithm is accelerated, so the optimization ability of the algorithm is improved by the three aspects. The simulation results show that the improved multi-verse optimization algorithm can track the maximum power point continuously and stably under the three conditions that uniform irradiance, partial shading and variable irradiance, and the convergence time and convergence accuracy have been greatly improved, thus verifying the feasibility of the algorithm in the maximum power point tracking control.
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