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Search Results: 1 - 10 of 127049 matches for " Li Jiarong "
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Effective Two-loop Thermodynamic Potential with Fermions in the real-time formalism of thermal field theory
Wang Xin,Li Jiarong
Physics , 1998,
Abstract: Within the real-time formalism (RTF) of thermal field theory,we apply the hard thermal loop (HTL) resummation technique to calculating effective two-loop thermodynamic potential in quark-gluon plasma (QGP) and its renormalization. The result with collective effects is obtained, which is valid for an arbitrary number of quark flavors with masses.
Non-Abelian Kubo Formula and the Multiple Time-Scale Method
Zhang Xiaofei,Li Jiarong
Physics , 1996, DOI: 10.1006/aphy.1996.0100
Abstract: The non-Abelian Kubo formula is derived from the kinetic theory. That expression is compared with the one obtained using the eikonal for a Chern-Simons theory. The multiple time-scale method is used to solve the non-Abelian Kubo formula, and the damping rate for longitudinal color waves is computed.
The Asymptotic Method Developed from Weak Turbulent Theory and the Nonlinear Permeability and Damping Rate in QGP
Zheng Xiaoping,Li Jiarong
Physics , 1997, DOI: 10.1016/S0370-2693(97)00849-6
Abstract: With asymptotic method developed from weak turbulent theory, the kinetic equations for QGP are expanded in fluctuation field potential $A^T_\mu $. Considering the second-order and third-order currents, we derive the nonlinear permeability tensor function from Yang-Mills field equation, and find that the third-order current is more important in turbulent theory. The nonlinear permeability formulae for longitudinal color oscillations show that the non-Abelian effects are more important than the Abelian-like effects. To compare with other works, we give the numerical result of the damping rate for the modes with zero wave vector.
Effects of gluon damping rate on the viscosity coefficient of the quark-gluon plasma at finite chemical potential
Hou Defu,Li Jiarong
Physics , 1997, DOI: 10.1016/S0375-9474(97)00045-6
Abstract: By considering the Debye screening and damping rate of gluons, the viscosity coefficient of the quark-gluon plasma was evaluated via real-time finite temperature QCD in the relaxation time approximation at finite temperature and chemical potential . The results show that both the damping rate and the chemical potential cause considerable enhancements to the viscosity coefficient of hot dense quark-gluon plasma.
A Colored Particle Acceleration by Fluctuations in QGP
Zheng Xiaoping,Li Jiarong
Physics , 1997,
Abstract: We discuss the energy variation of a parton passing through a quark-gluon plasma(QGP) taking into account nonlinear polarization effect. We find the parton can be accelerated by fluctuations in QGP, which gives us a new physical insight about the response of QGP to such external the current.
The Nonlinear Spatial Damping Rate in QGP
Chen Jisheng Li Jiarong
Physics , 1998, DOI: 10.1016/S0370-2693(98)00544-9
Abstract: The derivative expansion method has been used to solve the semiclassical kinetic equations of quark-gluon plasma (QGP). The nonlinear spatial damping rate, the imaginary part of the wave vector, for the longitudinal secondary color waves in the long wavelength limit has been calculated numerically.
The dielectric function excited by $ρNN$ tensor coupling in nuclear matter
Hui Liu,Jiarong Li
Physics , 2004, DOI: 10.1142/S0217732304013659
Abstract: The dielectric function of nuclear matter excited by $\rho NN$ tensor coupling has been studied in the framework of Finite temperature field theory. The induced current mechanism has been introduced to explain the three extrema on the dielectric function curve, of which one is in the space-like region and the other two are in the time-like region. It points out that the tensor coupling contributes much more large amplitude than the vector coupling and plays a more important role on the time-like region compared with its effect on the space-like region.
Covariant Perturbation Theory of Non-Abelian Kinetic Theory
Xiaoping Zheng,Jiarong Li
Physics , 1999,
Abstract: A double perturbation idea is presented in framework of the quark-gluon plasma kinetic theory. A solvable set of equations from the 'double perturbation' is derived and the equations are showed to be gauge-independent. The formalism of Landau damping rate for the plasmon at zero momentum is given and discussed.
Study of Solidification Shrinkage of Ductile Iron in Dry Sand Molds
Jiarong LI,Baicheng LIU,

材料科学技术学报 , 1999,
Abstract: The effects of metallurgical and processing parameters on the formation of solidification shrinkage in ductile iron have been studied, considering the parameters of carbon equivalent, inoculation, casting modulus and pouring temperature within specific ranges of these variables. Based on the orthogonal experiments, the metallurgical and processing parameters of the minimum casting shrinkage and the maximum casting shrinkage were obtained, and the effects of metallurgical and processing parameters on the formation of shrinkage cavities and porosities in ductile iron castings were discussed. A regression equation relating these variables to the formation of shrinkage was derived based upon the orthogonal experiments conducted.
Shrinkage Behaviour of Spheroidal Graphite Cast Iron in Green and Dry Sand Molds for the Benchmarking of Solidification Simulation

Wenzhen LI,Baicheng LIU,Jiarong LI,

材料科学技术学报 , 2001,
Abstract: The effects of metallurgical and processing parameters on the formation of shrinkage cavities and porosities in spheroidal graphite cast iron have been studied, considering the parameters of carbon equivalent, inoculation, casting modulus, mold type (green or dry) and pouring temperature within specific ranges of these variables. Based on the orthogonal experiments, the metallurgical and processing parameters of the minimum casting shrinkage and the maximum casting shrinkage were obtained, and the effects of metallurgical and processing parameters on the formation of shrinkage cavities and porosities in spheroids graphite cast iron castings were discussed. Finally, two regression equations relating these variables to the formation of shrinkage porosity were derived based upon the orthogonal experiments conducted.
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