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Rapid Synthesis of W–Cr Solid–Solution by Dielectric-Barrier Discharge-Plasma-Assisted Ball Milling
S. F. Hong,Z. C. Lu,Y. H. Liu,Q. M. He,W. Jiang,M. Q. Zeng 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Supersaturated solid–solutions in a W–Cr alloy system were fabricated by conventional milling and plasma milling. The differentextension mechanisms of the solid solubility that were created by ball milling with and without discharge plasma werestudied. The solid–solubility of Cr in W for the P-milling W–Cr alloy system was higher, which indicates that plasma millingpromotes the formation of W(Cr) solid–solution more easily than conventional milling. According to Miedema’s model, inthe W–Cr alloy system, the free-energy change to form a W(Cr) solid solution by plasma milling is reduced compared withconventional milling because of the heating effect of the discharge plasma. Therefore, a higher stored energy in the grainboundaries and dislocations of the W–Cr nanograins during plasma milling makes it easier to overcome the thermodynamicbarrier in the formation of a solid–solution, when compared with conventional milling.
A Rotating Flux Pump Employing a Magnetic Circuit and a Stabilized Coated Conductor HTS Stator
Z. Jiang,C. W. Bumby,R. A. Badcock,N. J. Long,H. J. Sung,M. Park 한국자기학회 2016 Journal of Magnetics Vol.21 No.2
High temperature superconductor (HTS) magnet systems usually employ metal current leads which bridge between the cryogenic environment and room temperature. Such current leads are the dominant heat load for these magnet systems due to a combination of electrical resistance and heat conduction. HTS flux pumps enable large currents to be injected into a HTS magnet circuit without this heat load. We present results from an axialtype HTS mechanically rotating flux pump which employs a ferromagnetic circuit and a Cu-stabilized coated conductor (CC) HTS stator. We show the device can be described by a simple circuit model which was previously used to describe barrel-type flux pumps, where the model comprises an internal resistance due to dynamic resistance and a DC voltage source. Unlike previously reported devices, we show the internal resistance and DC voltage in the flux pump are not exactly proportional to frequency, and we ascribe this to the presence of eddy currents. We also show that this axial-type flux pump has superior current injection capability over barrel-type flux pumps which do not incorporate a magnetic circuit.
P. Z. Si,X. L. Wang,X. F. Xiao,H. J. Chen,X. Y. Liu,L. Jiang,J. J. Liu,Z. W. Jiao,H. L. Ge 한국자기학회 2015 Journal of Magnetics Vol.20 No.3
Cr₂O₃ nanoparticles were prepared via one-step reactive laser ablation of Cr in oxygen. The metastable CrO₂ phase was obtained through the subsequent oxidation of Cr₂O₃ nanoparticles under O₂ with gas pressures of up to 40 MPa. The as-prepared Cr₂O₃ nanoparticles are spherical or rectangular in shape with sizes ranging from 20 nm to 50 nm. High oxygen pressure annealing is effective in producing meta-stable CrO₂ from as-dried Cr₂O₃ nanoparticles, and the Cr₂O₃ nanoparticles exhibit a weak ferromagnetic behavior with an exchange bias of up to 11 mT that can be ascribed to the interfacial exchange coupling between uncompensated surface spins and the antiferromagnetic core. The Cr₂O₃/CrO₂ nanoparticles exhibit an enhanced saturation magnetization and a reduced exchange bias with an increasing faction of CrO₂ due to the elimination of uncompensated surface spins over the Cr₂O₃ nanoparticles when exposed to a high pressure of O₂ and/or possible phase segregation that results in a smaller grain size for both Cr₂O₃ and CrO₂.
System Clock Reduction Based on Multiple Sampling for Digital Switching Power Supplies
Y. T. Yau,K. I. Hwu,W. Z. Jiang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, the proposed sampling structure based on one-comparator sampling is presented, which can significantly reduce the system clock frequency from 100MHz to 25MHz, so as to reduce chip area. This method is verified by a synchronously-rectified buck converter with a switching frequency of 200kHz, and the digital controller takes as a control kernel the EP1C3T100 FPGA created by Altera Co., along with the VHDL language to program this controller.
A Novel Voltage-Boosting Converter with Leakage Inductance Energy Recycling
K. I. Hwu,W. Z. Jiang,L. C. Yang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper a novel simple high step-up converter using a coupled inductor and a charge pump capacitor is presented. Compared with the traditional boost converter and other converters with simple structures, the proposed converter can achieve higher voltage gain. The leakage inductance energy of the coupled inductor can be recycled without any clamp circuit. Moreover, the active switch is not floating; thus, no isolated driver is required. Finally, the operating principles and the analysis of the proposed converter and an experimental prototype are given to provide the effectiveness of the proposed converter.
K. I. Hwu,W. Z. Jiang,H. M. Chen 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
In this paper, an improved KY converter is presented, which is constructed mainly by one charge pump capacitor and one central-tapped coupling inductor. Besides, a passive clamping snubber is added to this converter to improve the efficiency above half load. As compared to the KY converter, the voltage conversion ratio of the proposed converter is upgraded significantly. In this paper, the basic operating principles and mathematical deductions of the proposed converter are described, along with some experimental results provided to demonstrate the feasibility and effectiveness of the proposed converter.
( L. Wei ),( F. Wang ),( M. Zhang ),( J. Jia ),( A.A. Yakovlev ),( W. Xie ),( E.Z. Burnevich ),( J. Niu ),( Y.J. Jung ),( X. Jiang ),( M. Xu ),( X. Chen ),( Q. Xie ),( J. Li ),( J. Hou ),( H. Tang ),( 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Background/Aims: Treatment-naive GT 1b-infected patients from mainland China, South Korea and Russia were assessed for SVR at follow-up week 12 (SVR12) after receiving daclatasvir (60 mg, QD) and asunaprevir (100 mg, BID) (DCV+ASV). Methods: Patients were randomized 3:1 to receive DCV+ASV (24 weeks; immediate treatment [IM]) or 12 weeks of placebo followed by DCV+ASV (24 weeks; placebo-deferred treatment [PD]). The primary endpoint was to evaluate SVR12 in the IM arm to the historical rate for peginterferon/ribavirin (70%). Secondary endpoints included overall safety and safety comparisons between the treatment arms during the first 12 weeks. Results: 207 patients were randomized to IM (n=155) or PD (n=52); Asian (86%), female (59%), IL28B CC genotype (68%) and median age 49 (range 18-73) years; cirrhosis (13%), HCV RNA ≥6x106 IU/mL (53%). SVR12 in the IM arm was 92% and broadly unaffected by most baseline factors assessed (Figure); SVR12 was higher in patients without (96%) baseline NS5A-L31M/V or Y93H polymorphisms. There were 6 virologic breakthroughs, 6 relapses and 1 detectable HCV RNA at end-of-treatment in the IM arm. Safety was mostly comparable between the two arms during the first 12 weeks. The most frequent adverse events (AEs; ≥5%) during DCV+ASV (24 weeks) treatment in both arms were aminotransferase, bilirubin and INR elevations, hypertension, fatigue and respiratory tract infections; the most frequent treatment-emergent grade 3/4 laboratory abnormalities were aminotransferase (≤4.5%) and hematologic, lipase and total bilirubin abnormalities (≤2%); one patient (IM) discontinued DCV+ASV for aminotransferase elevations, nausea and jaundice (all reversible); one patient PD) discontinued DCV+ASV for a fatal AE unrelated to treatment. Conclusions: These data demonstrate that DCV+ASV is a highly efficacious and well tolerated treatment for treatment-naive HCV GT 1b-infected patients. Those treated immediately with DCV+ASV achieved a 92% SVR12 rate which was unaffected by factors known to attenuate response to interferon.