On the basis of nonlinear field equations obtained by us,we prove that the fields in the static limit are unstable in the sense of Lyapunov’s problem and may collapse,leading to the formation of a pancake-like struct...On the basis of nonlinear field equations obtained by us,we prove that the fields in the static limit are unstable in the sense of Lyapunov’s problem and may collapse,leading to the formation of a pancake-like structure in self-gravitating systems.Our numerical integration shows clearly the same tendency in a much more general condition.展开更多
The geometrical relation between quasiperiodic and periodic lattices is derived in both real and reciprocal spaces by means of the cut description.The relation between icosahedral phase and the corresponding body cent...The geometrical relation between quasiperiodic and periodic lattices is derived in both real and reciprocal spaces by means of the cut description.The relation between icosahedral phase and the corresponding body center cubic phase is discussed in detail.展开更多
A new computer model of viscous fingering (VF) in a porous medium is presented. The simulation results show that the VF pattern is in agreement with the experimental results. The simulation on the sweep efficiency als...A new computer model of viscous fingering (VF) in a porous medium is presented. The simulation results show that the VF pattern is in agreement with the experimental results. The simulation on the sweep efficiency also agrees with experiment results. The surface fractal dimension as a function of viscous ratio is found.展开更多
The renormalization of pion-exchange nucleon self-energy in nuclear matter is doneby dispersion relation.The exchange and correlation energies(in the ring approximation)ofpion,σ and ω mesons are derived and used to ...The renormalization of pion-exchange nucleon self-energy in nuclear matter is doneby dispersion relation.The exchange and correlation energies(in the ring approximation)ofpion,σ and ω mesons are derived and used to calculate the binding energy of nuctear matter atzero temperature.We find that the pionic contribution to the binding energy fails to lift the highdensity end of the binding energy curve,that is,the binding energy can not saturate without adensity dependent correction to the σNN and ωNN coupling constants.But the binding energycan saturate in the relativistic Hartree approximation plus the exchange and correlation energiesof л meson.展开更多
基金Supported by the National Natural Science Foundation of China。
文摘On the basis of nonlinear field equations obtained by us,we prove that the fields in the static limit are unstable in the sense of Lyapunov’s problem and may collapse,leading to the formation of a pancake-like structure in self-gravitating systems.Our numerical integration shows clearly the same tendency in a much more general condition.
基金supported by National Natural Science Foundation of China。
文摘The geometrical relation between quasiperiodic and periodic lattices is derived in both real and reciprocal spaces by means of the cut description.The relation between icosahedral phase and the corresponding body center cubic phase is discussed in detail.
基金Supported by the Natural Science Foundation of Hubei Provincial Education Department(No.2000B25002).
文摘A new computer model of viscous fingering (VF) in a porous medium is presented. The simulation results show that the VF pattern is in agreement with the experimental results. The simulation on the sweep efficiency also agrees with experiment results. The surface fractal dimension as a function of viscous ratio is found.
基金The project supported by the National Natural Scicnce Foundation of China
文摘The renormalization of pion-exchange nucleon self-energy in nuclear matter is doneby dispersion relation.The exchange and correlation energies(in the ring approximation)ofpion,σ and ω mesons are derived and used to calculate the binding energy of nuctear matter atzero temperature.We find that the pionic contribution to the binding energy fails to lift the highdensity end of the binding energy curve,that is,the binding energy can not saturate without adensity dependent correction to the σNN and ωNN coupling constants.But the binding energycan saturate in the relativistic Hartree approximation plus the exchange and correlation energiesof л meson.
