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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.
R&D Status of High-current Accelerators at IFP
J. J. Deng,J. S. Shi,W. P. Xie,L. W. Zhang,K. Z. Zhang,S. P. Feng,J. Li,M. Wang,Y. He,L. S. Xia,Z. Y. Dai,H. T. Li,L. Wen,S. F. Chen,X. Li,Q. G. Lai,M. H. Xia,Y. C. Guan,S. Y. Song,L. Chen 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
High-current accelerators have many important applications in Z-pinches, high-power microwaves, and free electron lasers, imploding liners and radiography and so on. Research activities on Zpinches, imploding liners, radiography at the Institute of Fluid Physics (IFP) are introduced. Several main high-current accelerators developed and being developed at IFP are described, such as the Linear Induction Accelerator X-Ray Facility Upgrade (LIAXFU, 12 MeV, 2.5 kA, 90 ns), the Dragon-I linear induction accelerator (20 MeV, 2.5 kA, 60 ns), and the Primary Test Stand for Z-pinch (PTS, 10 MA, 120 ns). The design of Dragon-II linear induction accelerator (20 MeV, 2.5 kA, 3 × 60 ns) to be built will be presented briefly.
ELECTROMAGNETIC VALVE TRAIN FOR GASOLINE ENGINE EXHAUST SYSTEM
X. Y. FAN,L. LIU,S. Q. CHANG,J. T. XU,J. G. DAI 한국자동차공학회 2016 International journal of automotive technology Vol.17 No.3
Electromagnetic valve train (EMVT) in camless engine offers large potential for both part load fuel economy and high load engine torque. However, it is more difficult to be applied on exhaust system than intake system. Because the gas pressure brings high demands for driving force, especially at high engine speed and full load. Based on the working characters of actuator, a method by increasing the transient currents in windings during valve’s opening motion is suggested to overcome the gas pressure. But this will cause more energy losses and heat. In order to make the EMVT used on exhaust system better, quantitative analysis is carried out against the additional power consumption caused by gas pressure under different conditions. Furthermore, an approach is introduced to define the optimal exhaust valve opening motion at full load conditions. It aims at making a better compromise between the engine power output and exhaust valves’ power consumption, thus both the efficiency of EMVT and engine performance are enhanced.
( Luo M ),( J Qiu ),( Y Zhang ),( J Dong ),( H Li ),( B Leng ),( Q Zhang ),( X Dai ),( X Niu ),( S Zhao ),( X Deng ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.8
In this study, we aimed to evaluate the effect of a-cyperone on S. aureus. We used a hemolysin test to examine the hemolytic activity in supernatants of S. aureus cultured with increasing concentrations of a-cyperone. In addition, we evaluated the production of a-hemolysin (Hla) by Western blotting. Real-time RT-PCR was performed to test the expression of hla (the gene encoding Hla) and agr (accessory gene regulator). Furthermore, we investigated the protective effect of a-cyperone on Hla-induced injury of A549 lung cells by live/dead and cytotoxicity assays. We showed that in the presence of subinhibitory concentrations of a-cyperone, Hla production was markedly inhibited. Moreover, a-cyperone protected lung cells from Hla-induced injury. These findings indicate that a-cyperone is a promising inhibitor of Hla production by S. aureus and protects lung cells from this bacterium. Thus, a-cyperone may provide the basis for a new strategy to combat S. aureus pneumonia.