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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.
Elemental mercury oxidation from flue gas by microwave catalytic oxidation over Mn/g-Al2O3
Z.S. Wei,Y.W. Luo,B.R. Li,Z.Y. Chen,Q.H. Ye,Q.R. Huang,J.C. He 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.24 No.-
The integrated microwave with Mn/g-Al2O3 and ozone was employed to oxidize elemental mercury (Hg0) in simulated flue gas. Hg0 oxidation efficiency in the integrated system attained 92.2%. Mn/g-Al2O3 catalyst was characterized by XRD, XPS, FT-IR, SEM. XPS spectra indicate the formation of a stable mercuric oxide species (HgO) from mercury oxidation. Ozone molecules in air could enhance free radical formation. Hg0 was oxidized to HgO in the presence of ozone and free radical. The coupling role between ozone and radical on mercury oxidation was formed. Microwave catalytic oxidation of elemental mercury reaction with the Mn/g-Al2O3 catalyst follows Langmuir–Hinshelwood kinetics.
Flutter analysis of long-span bridges using ANSYS
Z.Q. Chen,Y.Q. Ni,X.G. Hua,J.M. Ko 한국풍공학회 2007 Wind and Structures, An International Journal (WAS Vol.10 No.1
This paper presents a novel finite element (FE) model for analyzing coupled flutter of long-span bridges using the commercial FE package ANSYS. This model utilizes a specific user-defined element Matrix27 in ANSYS to model the aeroelastic forces acting on the bridge, wherein the stiffness and damping matrices are expressed in terms of the reduced wind velocity and flutter derivatives. Making use of this FE model, damped complex eigenvalue analysis is carried out to determine the complex eigenvalues, of which the real part is the logarithm decay rate and the imaginary part is the damped vibration frequency. The condition for onset of flutter instability becomes that, at a certain wind velocity, the structural system incorporating fictitious Matrix27 elements has a complex eigenvalue with zero or near-zero real part, with the imaginary part of this eigenvalue being the flutter frequency. Case studies are provided to validate the developed procedure as well as to demonstrate the flutter analysis of cable-supported bridges using ANSYS. The proposed method enables the bridge designers and engineering practitioners to analyze flutter instability by using the commercial FE package ANSYS.
Green function estimates for relativistic stable processes in half-space-like open sets
Chen, Z.Q.,Kim, P.,Song, R. North-Holland Pub. Co ; Elsevier Science Ltd 2011 Stochastic processes and their applications Vol.121 No.5
In this paper, we establish sharp two-sided estimates for the Green functions of relativistic stable processes (i.e. Green functions for non-local operators m-(m<SUP>2/α</SUP>-Δ)<SUP>α</SUP><SUP>/2</SUP>) in half-space-like C<SUP>1,1</SUP> open sets. The estimates are uniform in m@?(0,M] for each fixed M@?(0,∼). When m↓0, our estimates reduce to the sharp Green function estimates for -(-Δ)<SUP>α</SUP><SUP>/2</SUP> in such kind of open sets that were obtained recently in Chen and Tokle [12]. As a tool for proving our Green function estimates, we show that a boundary Harnack principle for X<SUP>m</SUP>, which is uniform for all m@?(0,∼), holds for a large class of non-smooth open sets.
Numerical investigation on residual stress in photovoltaic laminates after lamination
Q. Z. Zhang,B. F. Shu,M. B. Chen,Q. B. Liang,C. Fan,Z. Q. Feng,P. J. Verlinden 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
A series of simulations were carried out to investigate the residual stress induced in the photovoltaic laminate during the cooling processafter lamination with a global model and several submodels. The simulations focus separately on the effects of the cooling rate, thecell layout and anisotropy on the residual stress and deformation of the photovoltaic laminate in a comparative manner with the finiteelement method. The results have shown that significant stress concentration and twist occurs in the interconnection region in the cell. Inaddition, different cooling rates, cell layouts and anisotropy only influence the largest stress rather than the stress distribution and deformation. Therefore, the results of a uniform stationary isotropic model with fewer cells can provide enough insight into the stress distributionin real photovoltaic laminates and the modified largest first principal stress can be used for design and verification.
Photocatalytic and Hydrophilic Properties of TiO₂/ Fe₂O₃ Composite Films
Q. J. Liu,Q. L,X. H. Wu,G. Q. Zhang,Z. Q. Gao,G. X. Chen 한국진공학회(ASCT) 2002 Journal of Korean Vacuum Science & Technology Vol.6 No.1
TiO₂/Fe₂O₃ composite thin films were prepared on common glass substrates by sol-gel processing and dip-drawing method. The effect of Fe₂O₃ content on the photocatalytic and hydrophilic properties of composite films was studied. The results indicate that the photocatalytic activities of composite TiO₂ films are superior to that of pure TiO₂ film, and the film containing 0.5% Fe₂O₃ has the best photocatalytic activity. The hydrophilicity is difference with variant Fe₂O₃ content, the films containing 0.05%~0.1% Fe₂O₃ have the best hydrophilicity and their contact angles are 0°.
MR damping system for mitigating wind-rain induced vibration on Dongting Lake Cable-Stayed Bridge
Chen, Z.Q.,Wang, X.Y.,Ko, J.M.,Ni, Y.Q.,Spencer, B.F.,Yang, G.,Hu, J.H. Techno-Press 2004 Wind and Structures, An International Journal (WAS Vol.7 No.5
The Dongting Lake Bridge is a cable-stayed bridge crossing the Dongting Lake where it meets the Yangtze River in southern central China. Several intensive wind-rain induced vibrations had been observed since its open to traffic in 1999. To investigate the possibility of using MR damping systems to reduce cable vibration, a series of field tests were conducted. Based on the promising research results, MR damping system was installed on the longest 156 stay cables of Dongting Lake Bridge in June 2002, making it the worlds first application of MR dampers on cable-stayed bridge to suppress the wind-rain induced cable vibration. As a visible and permanent aspect of the bridge, the MR damping system must be aesthetically pleasing, reliable, durable, easy to maintain, as well as effective in vibration mitigation. Substantial work was done to meet these requirements. This paper describes field tests and the implementation of MR damping systems for cable vibration reduction. Three-years reliable service of this system proves its durability.
Proton Shell Evolution below Sn132 : First Measurement of Low-Lying β -Emitting Isomers in Ag123,125
Chen, Z. Q.,Li, Z. H.,Hua, H.,Watanabe, H.,Yuan, C. X.,Zhang, S. Q.,Lorusso, G.,Nishimura, S.,Baba, H.,Browne, F.,Benzoni, G.,Chae, K. Y.,Crespi, F. C. L.,Doornenbal, P.,Fukuda, N.,Gey, G.,Gernhä American Physical Society 2019 Physical Review Letters Vol.122 No.21