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RISS 인기검색어
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- 저자 : Liu Hongshun (검색결과 3 건)
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Multistep Controllability Synthesis and Growth Mechanism of ZnO Nanopagoda for Schottky Diode Device
Yang Liu,Guishan Liu,Yongbing Wang,Wenyuan Gao,Hongshun Hao,Bopu Huang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
Ordered ZnO arrays with a peculiar nanostructure were synthesized by a multistep synthesis process. The first step was the preparation of ZnO seed to induce the formation of ZnO array via potentiostatic electrodeposition method using a typical three electrode set-up. The second step was fabricating ZnO array along seed by Chemical Bath Deposition. Structural analysis of ZnO was carried out with X-ray diffraction (XRD), which showed a hexagonal wurtzite structure, and the selected area electron diffraction (SAED) patterns indicated that nanocrystalline is a part of monocrystal. The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to study the microstructure, and showed a pagoda-like microstructure with a tiny top and large bottom, which had an average top diameter of exceeding 800 nm at seeddepositing time of 60 s, and then growth mechanisms are subsequently given a further explanation, viewed from kinetics and thermodynamics. In addition, the current–voltage curves of schottky diode devices with ZnO nanopagoda arrays revealed that ZnO films arrays along grown ZnO seed had a higher reverse saturation current than ZnO films grown without seed, which are 1.48 x 10-6 A and 1.32 x 10-8 A, respectively. The minimum turn-on voltage of the diode with ZnO seed deposited 60 s is 0.18 V, without seed is 0.52 V.
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He Dongxin,Zang Qingjing,Li Junda,Liu Hongshun,Xu Zhe,Li Qingquan 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
The thermal stress at the interface of different materials becomes distorted during the thermal expansion of a cable terminal, leading to cracking and insulation failure. To give a warning of the ultimate thermal stress of cable terminal, this paper presents a warning method for the ultimate thermal stress of the cable terminal based on tailpipe temperature monitoring. Taking a 110 kV gas-insulated switchgear cable terminal as an example, the heat transfer model of the cable terminal is established under the working condition of a through-flow. The relationship between the temperature of the tailpipe, maximum thermal stress of the epoxy casing, and current-carrying capacity of the cable is established based on a data fitting method, the ultimate stress of the epoxy is taken as a threshold value for the detection and calculate the corresponding current-carrying capacity of the cable and temperature of the tailpipe. The results show that the thermal stress concentration in the cable terminal exceeds the limit when the monitoring temperature at the exposed tailpipe reaches 54.25 °C. If the relationship between the external temperature of the cable terminal and maximum thermal stress is known, warning of the ultimate thermal stress of cable terminal by monitoring the temperature of the tailpipe, providing theoretical support for the regulation of the current-carrying capacity of the cable.
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Principle Issues and Future Prospect on Sliding Arc Ablation of Metal Rail
Cong Haoxi,Zhou Yang,Zhaori Getu,Wang Yuxuan,Wei Haobo,Liu Zhaoling,Wang Jian,Zhang Li,Liu Hongshun,Li Qingmin 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3
Arc ablation occurs when the armature passes over the surface of metal rail. Ablation not only seriously afects the service life, but also may cause the failure to launch. In this paper, the research status of sliding arc ablation technology is summarized from the mechanism of sliding arc ablation, the characterization method of sliding arc ablation degree, and the enhanced design of materials or structures. Three key issues that need to be further solved are listed: the infuence mechanism of sliding arc ablation on microstructure and properties of metal materials, the service properties evaluation and quantitative characterization methods of metal material, as well as the modifed and enhanced design of materials or structures. In response to those problems, eforts are needed to improve the awareness of sliding arc ablation with the theoretical basis and characterization methods, as well as guide the improvement and strengthening of rail design.
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