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- 저자 : ( Liyang Tang ) (검색결과 5 건)
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Xin Tang,Zhen Li,Yang He,Liyang Wang,Yufei Yue,Wen Wang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2
In the stability analysis of DC (direct-current) power grids, AC (alternating current)/DC converters are usually treated as linear proportional amplifiers or inertial links. However, this approximation will have a considerable effect on the DC-side impedance model of a constant active power control converter and then affect the accuracy of the stability analysis of DC grids. In this paper, in view of the DC-side of the voltage fluctuations, the DC-side admittance model is established after the nonlinear relationship between the port voltage and the modulation signal function is determined. A comparison is made between the traditional modeling method and the proposed modeling method in the analysis of the phase–frequency characteristics and amplitude–frequency characteristics of the admittance. Results show that the proposed small-signal model can better fit the measured admittance in the low-frequency bands. The proposed admittance model in this paper is further applied to assess the small-signal stability of a DC grid. Finally, PSCAD/EMTDC simulation and lab-scaled prototype experiment are used to verify the correctness and effectiveness of the established admittance model. Results show that the small-signal model deduced in this paper can better fit and measure the admittance in the low-frequency band, and can more accurately judge the stability of the DC system.
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The Solution for Cooperative Beamforming Design in MIMO Multi-way Relay Networks
( Yong Wang ),( Hao Wu ),( Liyang Tang ),( Hui Li ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.3
In this paper, we study the design of network coding for the generalized transmit scheme in multiple input multiple output Y channel, where K users wish to exchange specified and shared information with each other within two slots. Signal space alignment at each user and the relay is carefully constructed to ensure that the signals from the same user pair are grouped together. The cross-pair interference can be canceled during both multiple accessing channel phase and broadcasting channel phase. The proposed signal processing scheme achieves the degrees of η(K)=K<sup>2</sup> freedom of with fewer user antennas.
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Electrospun Ag‑Doped SnO2 Hollow Nanofbers with High Antibacterial Activity
Li Yang,Gao Songwei,Zhang Bin,Mao Huaming,Tang Xiaoning 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3
With the continuous improvement in medical science in modern times, the spread of bacterial infection has become a matterof global concern. Therefore, the search for biological medical materials with antibacterial function has become a focusof intense research. In this work, pure SnO2 and Ag-doped SnO2 hollow nanofbers were fabricated by a combination of anelectrospinning method and a calcination procedure, and the Effects of the doped Ag on antibacterial activity and catalyticantibacterial activity were subsequently investigated. Through the process of high-temperature calcination, a high heatingrate would lead to the formation of a hollow tubular structure in SnO2 fbers, and Ag2O would be reduced to Ag0by a facileprocess with appropriate thermal treatment. Additionally, the existence of SnO2 as a tetragonal rutile structure was confrmed. On the basis of pure SnO2, doping with Ag greatly improved the antibacterial activity and catalytic antibacterial activity ofhollow nanofbers. The formation mechanism and the antibacterial mechanism of pure SnO2 and Ag-doped hollow nanofbersare also discussed. This study has broad application prospects for biological medicine.
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Li Yang,Xue Hongtao,Zhou Xin,Tang Fuling,Li Xiuyan,Ren Junqiang,Lu Xuefeng 한국물리학회 2021 Current Applied Physics Vol.28 No.-
Grain boundaries (GBs) relaxation is a promising and effective strategy to improving GB stability or stabilizing nanocrystalline metals. However, previous studies mainly focused on nanocrystalline pure metals and GB behaviors therein, without considering the role of foreign atoms such as impurity or alloying atoms in GB relaxation. In this work, the shear-strain induced structural relaxation of pure Cu Σ3 [110](112) symmetric tilt GBs (STGBs), and the effects of foreign elements (Fe and Ni) and temperature on the GB relaxation were investigated in detail by molecular dynamics method. The results show that shear strain can trigger the structural relaxation of pure, Fe- and Ni-containing Cu GBs by the emission of Shockley partial dislocations from Cu GBs. Both Fe and Ni have impediment effects on the shear-strain induced GB relaxation, though the content of Fe or Ni atom (0.00165 at.%) is quite low in the GB model. The temperature cannot trigger GB relaxation independently within the considered temperature range, but play a positive role in the shear-strain induced structural relaxations of pure, Fe- and Ni-containing Cu Σ3 [110](112) STGBs. Our work might gain new insights into the mechanically induced GB relaxation in nanocrystalline copper and could be beneficial for improving the stability of Cu GBs.
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