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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.
Park, Y.K.,Park, E.S.,Kim, D.H.,Ahn, S.H.,Park, S.H.,Lee, A.R.,Park, S.,Kang, H.S.,Lee, J.H.,Kim, J.M.,Lee, S.K.,Lim, K.H.,Isorce, N.,Tong, S.,Zoulim, F.,Kim, K.H. Elsevier Science Publishers 2016 Journal of hepatology Vol. No.
<P>Background & Aims: Cytokines are key molecules implicated in the defense against virus infection. Tumor necrosis factor-alpha (TNF-alpha) is well known to block the replication of hepatitis B virus (HBV). However, the molecular mechanism and the downstream effector molecules remain largely unknown. Methods: In this study, we investigated the antiviral effect and mechanism of p22-FLIP (FLICE-inhibitory protein) by ectopic expression in vitro and in vivo. In addition, to provide the biological relevance of our study, we examined that the p22-FLIP is involved in TNF-alpha-mediated suppression of HBV in primary human hepatocytes. Results: We found that p22-FLIP, a newly discovered c-FLIP cleavage product, inhibited HBV replication at the transcriptional level in both hepatoma cells and primary human hepatocytes, and that c-FLIP conversion to p22-FLIP was stimulated by the TNF-alpha/NF-kappa B pathway. p22-FLIP inhibited HBV replication through the upregulation of HNF3 beta but downregulation of HNF4 alpha, thus inhibiting both HBV enhancer elements. Finally, p22-FLIP potently inhibited HBV DNA replication in a mouse model of HBV replication. Conclusions: Taken together, these findings suggest that the anti-apoptotic p22-FLIP serves a novel function of inhibiting HBV transcription, and mediates the antiviral effect of TNF-a against HBV replication. (C) 2015 European Association for the Study of the Liver. Published by Elsevier B.V. All rights reserved.</P>
M. R. Kim,C. Tong,D. H. Shin,이진구,손명식,S. K. Kim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.5
We discuss the strain and the many-body effects on the ground-state energy for quasi-two-dimensional ${\rm In_{\it x}Ga_{1- \it x}As/InGaAsP}$ quantum well systems, taking into account the valence-band nonparabolicity for the holes. The valence-band structure is obtained by solving a ${4 \times 4}$ Luttinger-Kohn Hamiltonian with elements derived in the ${\bf k \cdot p}$ perturbation framework. The ground-state energy is investigated by calculating the exchange-correlation self-energy within the full dynamical random-phase approximation. We show that the exchange-correlation self-energy plays an important role in determining the ground-state energy. In addition, we observe a strong dependence of the ground-state energy in quantum well systems on the sheet carrier density and the strain.
Electro-elastic analysis of piezoelectric laminated plates
Zhao, Minghao,Qian, Caifu,Lee, S.W.R.,Tong, Pin,Suemasu, H.,Zhang, Tong-Yi The Korean Society for Composite Materials 2007 Advanced composite materials Vol.16 No.1
Based on the Kirchhoff hypothesis of normal-remain-normal, the present work analyses piezoelectric laminated plates, wherein poled piezoelectric laminae are transversely isotropic and function as actuators. A quadric electric field is induced inside a piezoelectric lamina under a given applied voltage and mechanical bending. The governing equations for the piezoelectric laminated plate derived from the principle of virtual work in terms of the electric enthalpy have the same forms as those for a conventional composite laminated plate. We use rectangular sandwich plates of Al/PZT/Al and PZT/Al/PZT with four simply supported edges to demonstrate the prediction of the maximum bending stress in the PZT layer. The analytic solutions are verified by three-dimensional finite element analysis.
Response of plasma rotation to resonant magnetic perturbations in J-TEXT tokamak
Yan, W,Chen, Z Y,Huang, D W,Hu, Q M,Shi, Y J,Ding, Y H,Cheng, Z F,Yang, Z J,Pan, X M,Lee, S G,Tong, R H,Wei, Y N,Dong, Y B IOP 2018 Plasma physics and controlled fusion Vol.60 No.3
<P>The response of plasma toroidal rotation to the external resonant magnetic perturbations (RMP) has been investigated in Joint Texas Experimental Tokamak (J-TEXT) ohmic heating plasmas. For the J-TEXT’s plasmas without the application of RMP, the core toroidal rotation is in the counter-current direction while the edge rotation is near zero or slightly in the co-current direction. Both static RMP experiments and rotating RMP experiments have been applied to investigate the plasma toroidal rotation. The core toroidal rotation decreases to lower level with static RMP. At the same time, the edge rotation can spin to more than 20 km s<SUP>−1</SUP> in co-current direction. On the other hand, the core plasma rotation can be slowed down or be accelerated with the rotating RMP. When the rotating RMP frequency is higher than mode frequency, the plasma rotation can be accelerated to the rotating RMP frequency. The plasma confinement is improved with high frequency rotating RMP. The plasma rotation is decelerated to the rotating RMP frequency when the rotating RMP frequency is lower than the mode frequency. The plasma confinement also degrades with low frequency rotating RMP.</P>