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RISS 인기검색어
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- 저자 : Zhao Hongsen (검색결과 4 건)
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Zhao Hongsen,Yang Jiaqiang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.5
Magnetic eddy current losses is signifi cant in permanent magnet motors, especially in high-power density permanent magnet motors. It signifi cantly aff ects the magnet’s temperature and properties and may cause irreversible demagnetization. Several methods for reducing magnetic eddy current losses is proposed to address these problems. First, a fi eld-circuit coupled mathematical model was established to calculate the magnetic eddy current losses. Experiments on the phase current and magnetic eddy current losses verify the accuracy of fi eld-circuit coupled mathematical model. Then based on the model, the eff ect of the trigger angle, slot opening width, pole arc coeffi cient, pole arc center off set, and auxiliary slots on the magnetic eddy current losses were assessed. The results showed that the magnetic eddy current loss could be reduced by choosing a suitable leading trigger angle, pole arc coeffi cient, and pole arc center off set. A smaller slot opening width reduced the eddy current losses. A novel auxiliary slot with an optimized size is proposed to reduce eddy current losses. Finally, taking the trigger angle, slot opening width, pole arc coeffi cient, pole arc center off set and the auxiliary groove as the optimization factors and the magnetic eddy current loss as the optimization target, the optimal parameter scheme is obtained by Taguchi method. The simulation results show that the optimized magnetic eddy current losses is reduced by 8.57%.
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Xin Peng,Liu Yadan,Tao Dajun,Zhao Hongsen 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
In order to research the variation characteristics and infl uencing factors of the rotor surface eddy current loss during the nuclear power half-speed turbo-generator asymmetric operation, the harmonics characteristics of eddy current generated by stator negative sequence current on the rotor surface are derived by analytical method, and the harmonic characteristics of excitation current generated by stator negative sequence current on excitation winding are derived. On the basis, the harmonic current characteristics of stator winding caused by the harmonic component of excitation current are derived. Furthermore, the eddy current characteristics on the rotor surface caused by the harmonic current in the stator current are derived. At the same time, the infl uence factors and distribution characteristics of eddy current and eddy current loss of rotor damping strip and slot wedge are given. On this basis, taking a 1407MVA nuclear power half-speed turbo-generator as an example, the fi eld-circuit coupled model is established. The normal and asymmetrical operation of the generator is simulated. Through the comparison and analysis between simulation results and theoretical derivation results, the correctness of theoretical derivation is verifi ed. A theoretical reference for researching mechanism and infl uencing factors of rotor surface loss during nuclear power half-speed turbo-generator asymmetrical operation is proved.
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Wang, Xia,Wang, Hong,Li, Qiang,Li, Hongsen,Xu, Jie,Zhao, Guoxia,Li, Hongliang,Guo, Peizhi,Li, Shandong,Sun, Yang-kook The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.13
<P>A promising anode material for lithium-ion batteries (LIBs) consisting of Sb2Se3 nanorods and reduced graphene oxide (rGO) sheets has been prepared by an effective solvothermal approach. The synergetic effect between Sb2Se3 nanorods and rGO matrix provides not only high conductivity paths and strong electron contact interface, but also alleviates the volume change of Sb2Se3 nanorods, resulting in excellent lithium-storage performance. When tested as an anode material for LIBs, a high capacity of 868.30 mAh g(-1) can be retained after 100 cycles at 200 mA g(-1). Even at 2000 mA g(-1), a satisfactory capacity of 430.40 mAh g(-1) after long 550 cycles can be delivered. Ex situ X-ray diffraction study suggests that the Sb2Se3/rGO composite follows the combined Li+ intercalation, conversion reaction and alloying reaction mechanism. These features suggest the Sb2Se3/rGO composite a viable choice for application as an anode material in high-performance LIBs. (C) 2017 The Electrochemical Society. All rights reserved.</P>
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Wang Guanhuier,Zhang Xinling,Bu Xi,An Yang,Bi Hongsen,Zhao Zhenmin 한국조직공학과 재생의학회 2022 조직공학과 재생의학 Vol.19 No.1
BACKGROUND: As a contour-supporting material, the cartilage has a significant application value in plastic surgery. Since the development of hydrogel scaffolds with sufficient biomechanical strength and high biocompatibility, cell-laden hydrogels have been widely studied for application in cartilage bioengineering. This systematic review summarizes the latest research on engineered cartilage constructed using cell-laden hydrogel scaffolds in plastic surgery. METHODS: A systematic review was performed by searching the PubMed and Web of Science databases using selected keywords and Medical Subject Headings search terms. RESULTS: Forty-two studies were identified based on the search criteria. After full-text screening for inclusion and exclusion criteria, 18 studies were included. Data collected from each study included culturing form, seed cell types and sources, concentration of cells and gels, scaffold materials and bio-printing structures, and biomechanical properties of cartilage constructs. These cell-laden hydrogel scaffolds were reported to show some feasibility of cartilage engineering, including better cell proliferation, enhanced deposition of glycosaminoglycans and collagen type II in the extracellular matrix, and better biomechanical properties close to the natural state. CONCLUSION: Cell-laden hydrogels have been widely used in cartilage bioengineering research. Through 3-dimensional (3D) printing, the cell-laden hydrogel can form a bionic contour structure. Extracellular matrix expression was observed in vivo and in vitro, and the elastic modulus was reported to be similar to that of natural cartilage. The future direction of cartilage tissue engineering in plastic surgery involves the use of novel hydrogel materials and more advanced 3D printing technology combined with biochemistry and biomechanical stimulation.
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