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RISS 인기검색어
- 검색키워드
- 저자 : Yujie Fei (검색결과 3 건)
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Dynamic performance of 6.5 kV SiC MOSFET body diodes and anti‑parallel Schottky barrier diodes
Yujie Du,Xinling Tang,Xiaoguang Wei,Shuai Sun,Fei Yang,Zhibin Zhao 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.6
For a silicon carbide (SiC) metal–oxide–semiconductor fi eld-eff ect transistor (MOSFET), both the body diode of the MOSFET and an anti-parallel diode can function as a freewheeling diode that carries reverse current. Selecting a suitable freewheeling method is particularly important to fully exploit the performance of high-voltage SiC MOSFET devices. In this study, based on the 6.5 kV SiC MOSFET and the Schottky barrier diode (SBD) developed by our research group, the dynamic characteristics of the MOSFET body diode, the SBD, and the parallel connection of the two are investigated. In addition, the influence of capacitive current on the dynamic characteristics is analyzed by establishing an equivalent circuit model. Test results show that when compared with the body diode, the SBD has an extremely low reverse recovery current, a lower capacitive current, and better reverse recovery temperature stability. Thus, the SBD is regarded as the most suitable freewheeling diode for the 6.5 kV SiC MOSFET. Finally, a package solution for the 6.5 kV SiC MOSFET and SBD is proposed.
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Yi Zhong,Ai Jiang,Fei Sun,Yuanfan Xiao,Ying Gu,Lei Wu,Yujie Zhang,Hongcan Shi 한국조직공학과 재생의학회 2019 조직공학과 재생의학 Vol.16 No.1
BACKGROUND: Different decellularization methods can affect the integrity and the biomechanical and biocompatible properties of the tracheal matrix. Natural cross-linking with genipin can be applied to improve those properties. The goals of this study were to evaluate the effects of different decellularization methods on the properties of genipin-cross-linked decellularized tracheal matrices in rabbits. METHODS: The tracheas of New Zealand rabbits were decellularized by the Triton-X 100-processed method (TPM) and the detergent-enzymatic method (DEM) and were then cross-linked with genipin. Mechanical tests, haematoxylin–eosin staining, Masson trichrome staining, Safranin O staining, DAPI staining, scanning electronic microscopy (SEM), and biocompatibility tests were used to evaluate the treatment. The bioengineered trachea and control trachea were then implanted into allogeneic rabbits for 30 days. The structural and functional analyses were performed after transplantation. RESULTS: The biomechanical tests demonstrated that the biomechanical properties of the decellularized tracheas decreased and that genipin improved them (p\0.05). The histological staining results revealed that most of the mucosal epithelial cells were removed and that the decellularized trachea had lower immunogenicity than the control group. The analysis of SEM revealed that the decellularized trachea retained the micro- and ultra-structural architectures of the trachea and that the matrices cross-linked with genipin were denser. The biocompatibility evaluation and in vivo implantation experiments showed that the decellularized trachea treated with the DEM had better biocompatibility than that treated with the TPM and that immunogenicity in the cross-linked tissues was lower than that in the uncross-linked tissues (p\0.05). CONCLUSIONS: Compared with the trachea treated with the TPM, the rabbit trachea processed by the DEM had better biocompatibility and lower immunogenicity, and its structural and mechanical characteristics were effectively improved after the genipin treatment, which is suitable for engineering replacement tracheal tissue.
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Rapid Microwave Irradiation Synthesis and Photoelectrochemical Performance of Cu3BiS3 nanoparticles
Wei Wang,Guowei Zhi,Liu Liu,Yujie Fei,QinYang Sheng,Yushi Shi,Hanyu Yao,Hongqiang Qian 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.6
A photocatalytic material with high performance and low cost plays a decisive role in the industrialization of photocatalytichydrogen evolution. In this work, Cu3BiS3 nanoparticles were successfully synthesized by the microwave irradiationmethod, and the formation mechanism of Cu3BiS3 was studied. The Cu3BiS3 was a nanorod structure with 122 nm diameterand 41 nm length. The band gap was 1.31 eV and the EVB was located at 0.15 eV from the Mott-Schottky analysis. The Cu3BiS3 electrode exhibited an excellent HER performance with an onset potential of 870 mV, a Tafel slope of 251.07mV/dec. And the charge transfer resistance (Rct) of Cu3BiS3 electrode was 7.2 Ω. The electrode also revealed the goodphotoelectric response ability. The electrode also revealed the good photoelectric response ability and good stability bytime course of the photocurrents. This work provided a fast, low-cost method to prepare the Cu3BiS3 for photocatalysiswater splitting.
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