The Pionic Effect on the Binding Energy of Relativistic Particle-Hole Excitation in Nuclear Matter

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.

生物样本库建设管理现状与建议

系统梳理国外生物样本库建设模式、国内生物样本库管理建设情况,探讨疾病预防控制系统内建立公共卫生生物样本库的机遇、优势和挑战,为今后指导疾病预防控制系统生物样本库建设管理的实际工作提出政策建议和解决途径。