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- 저자 : Mingbo Yang (검색결과 4 건)
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Models and Experiments for the Main Topologies of MRC-WPT Systems
Yang, Mingbo,Wang, Peng,Guan, Yanzhi,Yang, Zhenfeng The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
Models and experiments for magnetic resonance coupling wireless power transmission (MRC-WPT) topologies such as the chain topology and branch topology are studied in this paper. Coupling mode theory based energy resonance models are built for the two topologies. Complete energy resonance models including input items, loss coefficients, and coupling coefficients are built for the two topologies. The storage and the oscillation model of the resonant energy are built in the time domain. The effect of the excitation item, loss item, and coupling coefficients on MRC systems are provided in detail. By solving the energy oscillation time domain model, distance enhancing models are established for the chain topology, and energy relocating models are established for the branch topology. Under the assumption that there are no couplings between every other coil or between loads, the maximum transmission capacity conditions are found for the chain topology, and energy distribution models are established for the branch topology. A MRC-WPT experiment was carried out for the verification of the above model. The maximum transmission distance enhancement condition for the chain topology, and the energy allocation model for the branch topology were verified by experiments.
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Models and Experiments for the Main Topologies of MRC-WPT Systems
Mingbo Yang,Peng Wang,Yanzhi Guan,Zhenfeng Yang 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
Models and experiments for magnetic resonance coupling wireless power transmission (MRC-WPT) topologies such as the chain topology and branch topology are studied in this paper. Coupling mode theory based energy resonance models are built for the two topologies. Complete energy resonance models including input items, loss coefficients, and coupling coefficients are built for the two topologies. The storage and the oscillation model of the resonant energy are built in the time domain. The effect of the excitation item, loss item, and coupling coefficients on MRC systems are provided in detail. By solving the energy oscillation time domain model, distance enhancing models are established for the chain topology, and energy relocating models are established for the branch topology. Under the assumption that there are no couplings between every other coil or between loads, the maximum transmission capacity conditions are found for the chain topology, and energy distribution models are established for the branch topology. A MRC-WPT experiment was carried out for the verification of the above model. The maximum transmission distance enhancement condition for the chain topology, and the energy allocation model for the branch topology were verified by experiments.
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Laixin Shi,Li Hu,Huyuan Lv,Mingao Li,Tao Zhou,Mingbo Yang 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
A novel and efficient deformation methodology, viz., hot-rolling–shearing–bending (HRSB), to introduce a large amount of{10̄12} extension twins (ETs) and control the texture of the AZ31 magnesium alloy thin sheet was proposed. Microstructureand texture within various regions of the thin sheet fabricated by the HRSB method were investigated by means of electronback-scattered diffraction measurement. The experimental results indicated that using only single pass of HRSB, grains withc-axis//normal direction (ND) in as-received sheet are nearly twinned totally (about 91% volume fraction of {10̄12} ET),leading to the formation of c-axis//rolling direction (RD) texture component and the disappearance of c-axis//ND texturecomponent. As for the HRS sample which has suffered from rolling–shearing deformation, both a tensile stress componentderiving from the shearing deformation and a compressive stress component resulting from the impediment effect of themould structure are beneficial to activate {10̄12} ET, the volume fraction of which is about 72%. With respect to the HRSBsample which has undergone rolling–shearing–bending deformation, the further increase in volume fraction of {10̄12} ETmight be mainly related to the resultant compressive stress of the tensile stress derived from the bending deformation andthe compressive stress resulting from the impediment effect of mould structure. It would hinder the activation of {10̄12} ETwithin twinned areas and promote the migration of existing boundaries of {10̄12} ET into un-twinned areas.
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Ammonia etched petroleum pitch-based porous carbon as efficient catalysts for CO2 electroreduction
Ning Hui,Guo Zhihao,Wang Wenhang,Wang Xiaoshan,Yang Zhongxue,Ma Zhengguang,Tian Yangming,Wu Chenghao,Hao Jian,Wu Mingbo 한국탄소학회 2022 Carbon Letters Vol.32 No.3
Electrochemical reduction of carbon dioxide to valuable chemicals is a promising way of storing renewable energy through electric-to-chemical energy conversion, while its large-scale application is in urgent need of cheap and high-performance catalysts. Herein, we invent a convenient method to synthesize N-doped porous carbon by ammonia etching the pyrolysis carbon of petroleum pitch. We found the ammonia etching treatment not only increase the pyridinic-N content, but also enlarge the specific surface area of the petroleum pitch-based porous carbon. As a cheap and easily available catalyst for carbon dioxide electroreduction, up to 82% of Faradaic efficiency towards carbon monoxide was obtained at − 0.9 V vs the reversible hydrogen electrode in 0.1 M KHCO3. After a long time electrocatalysis of more than 20 h, the Faradaic efficiency of carbon monoxide remains 80%, indicating the porous carbon as made have an ultra-high stability as catalyst for carbon dioxide reduction. Our work provides a new technology to economically prepare efficient electrocatalysts for carbon dioxide reduction.
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