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- 저자 : J.-Y. Tang (검색결과 72 건)
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Experimental Study of the Runaway Current in the J-TEXT Tokamak
Y. H. Luo,Z. Y. Chen,X. Q. Zhang,D. W. Huang,W. Jin,Y. H. Huang,Y. Tang,J. C. Li,R. H. Tong,W. Yan,G. Zhuang 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.3
Major plasma disruptions in tokamaks often generate runaway currents, which contain electronswith energies of several tens of megaelectron-volts (MeV). These currents can cause substantialdamage when control is lost and the current hits the limiters or the vessel wall. The interactionbetween the runaway electrons and the impurities inside the plasma results in soft X-ray emission,which can provide detailed information about the runaway generation process and the confinementof runaway electrons. A vertical soft X-ray array at the top of Joint Texas Experimental Tokamak(J-TEXT) was used to study the runaway beams resulting from major disruptions. Runawayelectron production and confinement of runaway current were observed by using soft X-ray images.
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( 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.
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Magnetic Annealing Effects on the Properties of Multilayer BaTiO3/CoFe2O4 Thin Films
Y. Q. Dai,J. M. Dai,X. W. Tang,X. B. Zhu,J. Yang,Q. C. Liu,Y. P. Sun 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Multilayer BaTiO3/CoFe2O4 thin films are prepared via a chemical solution deposition methodwith and without magnetic annealing, respectively. The microstructural, magnetic, dielectric andferroelectric properties of the films’ are investigated. The dielectric constant, polarization andmagnetization of the multilayer thin films are improved with magnetic annealing. Moreover, forthe magnetic annealing films, the saturation magnetization measured with the measuring magneticfield vertical to the film surface is much higher than that measured with the field parallel to thefilm surface. These novel phenomena may be caused by the decrease in the clamping of the BaTiO3layer and the arrangement of the induced easy axis in the CoFe2O4 layer caused by the appliedannealing field.
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Y.G. Xiao,M.H. Tang,Y. Xiong,J. C. Lin,C.P. Cheng,B. Jiang,H.Q. Cai,Z.H. Tang,X.S. Lv,X.C. Gu,Y.C. Zhou 한국물리학회 2012 Current Applied Physics Vol.12 No.6
The surface potential and drain current of double-gate metal-ferroelectric-insulator-semiconductor (MFIS) field-effect transistor were investigated by using the ferroelectric negative capacitance. The derived results demonstrated that the up-converted semiconductor surface potential and low subthreshold swing S = 34 (<60 mV/dec) can be realized with appropriate thicknesses of ferroelectric thin film and insulator layer at room temperature. What’s more, a reduction gate voltage about 260 mV can be reached if the ON-state current is fixed to 600 mA/mm. It is expected that the derived results can offer useful guidelines for the application of low power dissipation in ongoing scaling of FETs.
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Tang, J.W.,Sun, H.,Yao, X.H.,Wu, Y.F.,Wang, X.,Feng, J. Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.3
The study was conducted to examine the effects of partially replacing soybean meal (SBM) by solid-state fermented cottonseed meal (FCSM) on growth performance, serum biochemical parameters and immune function of broilers. After inoculated with Bacillus subtilis BJ-1 for 48 h, the content of free gossypol in cottonseed meal was decreased from 0.82 to 0.21 g/kg. A total of 600, day-old male yellow-feathered broilers were randomly divided into four groups with three replicates of 50 chicks each. A corn-SBM based control diet was formulated and the experimental diets included 4, 8 or 12% FCSM, replacing SBM. Throughout the experiment, broilers fed 8% FCSM had higher (p<0.05) body weight gain than those fed 0, 4 and 12% FCSM. The feed intake in 8% FCSM group was superior (p<0.05) to other treatments from d 21 to 42. On d 21, the concentration of serum immunoglobin M in the 4% and 8% FCSM groups, as well as the content of complements (C3, C4) in 8% FCSM group were greater (p<0.05) than those in the SBM group. Besides, birds fed 8% FCSM had increased (p<0.05) serum immunoglobin M, immunoglobulin G and complement C4 levels on d 42 compared with bird fed control diet. No differences (p>0.05) were found between treatments regarding the serum biochemical parameters and the relative weights of immune organs. In conclusion, FCSM can be used in broiler diets at up to 12% of the total diet and an appropriate replacement of SBM with FCSM may improve growth performance and immunity in broilers.
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Characteristics and Potential Applications of the Proton Beams at the CSNS
J. Y. Tang,S. N. Fu,J. Wei 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.3
The China Spallation Neutron Source (CSNS) is a large scientific research facility mainly serving the multidisciplinary research on material structure by using the neutron scattering technique. The accelerators can provide a proton beam of 120 kW with a repetition rate of 25 Hz, and can be upgraded to 240 kW (CSNS-II) or 500 kW (CSNS-II'). Besides as a driving source for the spallation target, the proton beams can be exploited for various applications both in fundamental research and in applications. The utilization of the CSNS proton beams can be in two different modes: the parasitic mode and the dedicated mode. The former one does not affect the normal operation of the spallation neutron source, and the latter can provide the full potential of the CSNS accelerators. Applications using the CSNS proton beams will be in two separate areas, utilizing the beams from the linac and from the RCS, respectively. Some of the CSNS proton beam applications are space single event effect and space radiology studies, white neutron source, proton therapy on ocular melanomas and low-depth cancers, fast neutron therapy, and borium capture neutron therapy. Other applications, such as testing studies of particle detectors, non-space radio-biological studies, radiation material studies, and nuclear physics, are also under consideration. The China Spallation Neutron Source (CSNS) is a large scientific research facility mainly serving the multidisciplinary research on material structure by using the neutron scattering technique. The accelerators can provide a proton beam of 120 kW with a repetition rate of 25 Hz, and can be upgraded to 240 kW (CSNS-II) or 500 kW (CSNS-II'). Besides as a driving source for the spallation target, the proton beams can be exploited for various applications both in fundamental research and in applications. The utilization of the CSNS proton beams can be in two different modes: the parasitic mode and the dedicated mode. The former one does not affect the normal operation of the spallation neutron source, and the latter can provide the full potential of the CSNS accelerators. Applications using the CSNS proton beams will be in two separate areas, utilizing the beams from the linac and from the RCS, respectively. Some of the CSNS proton beam applications are space single event effect and space radiology studies, white neutron source, proton therapy on ocular melanomas and low-depth cancers, fast neutron therapy, and borium capture neutron therapy. Other applications, such as testing studies of particle detectors, non-space radio-biological studies, radiation material studies, and nuclear physics, are also under consideration.
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Tang T.Y.,Lee H.,Kim H.S.,Kim G.H.,Lee B.,Kim H.J.,Lee H.J. 한국물리학회 2021 Current Applied Physics Vol.29 No.-
A nanosecond-pulse power source transfers energy to electrons of atmospheric pressure discharges in a nanosecond-scale rising time and shows different plasma chemistry than a slowly varying sinusoidal discharge. We report how the operation parameters, such as applied voltage, pulse duration, and repetition frequency, affect the discharge characteristics and the surface property of polydimethylsiloxane (PDMS). The applied voltage controls the energy delivery per a pulse cycle, and the repetition frequency dominantly affects the plasma density in a long-term operation. The water contact angle, the optical emission spectroscopy, and the atomic force microscope diagnostics on the PDMS are presented. While the polarity of the nano pulse bias changes the emission length of the plasma jet, the hydrophilicity is not affected by it because the chemical reactions by radicals are more dominant than the physical reactions of charged particles on PDMS.
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Suboptimal control strategy in structural control implementation
J. Y. Xu,Q. S. Li,G. Q. Li,J. R. Wu,J. Tang 국제구조공학회 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.1
The suboptimal control rule is introduced in structural control implementation as an alternative over the optimal control because the optimal control may require large amount of processing time when applied to complex structural control problems. It is well known that any time delay in structural control implementation will cause un-synchronized application of the control forces, which not only reduce the effectiveness of an active control system, but also cause instability of the control system. The effect of time delay on the displacement and acceleration responses of building structures is studied when the suboptimal control rule is adopted. Two examples are given to show the effectiveness of the suboptimal control rule. It is shown through the examples that the present method is easy in implementation and high in efficiency and it can significantly reduce the time delay in structural control implementation without significant loss of performance.
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