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[en] We have studied the collective flow at high and intermediate energy in a relativistic Vlasov-Uehling-Uhlenbeck (RVUU) approach based on Walecka's QHD-Ⅰ model, with the aim of probing the nuclear matter equation of state (EOS) and the in-medium n-n cross section. (authors)

[en] A self-consistent description of the relativistic RBUU is presented, in which both mean field and NN scattering cross section are given explicitly and simultaneously determined by the input Lagrangian. Based on his approach a modified σ-ω model with momentum and density dependent coupling strengths for σ and ω meson fields is showed, with which both optical potential and mean free path in nuclear medium can be nicely reproduced. The in-medium elastic and inelastic NN cross sections are studied. It is found that medium effects play a considerable role in correcting the NN scattering cross section. (N.H.A.). 14 figs, 1 tab, 34 refs

[en] Heavy ion collisions (HIC) provide a unique opportunity to study the time evolution process of nuclear matter under violent collisions as well as nuclear properties under extreme conditions of high density and temperature. As the density changes dramatically during certain period of HIC, the effect of the mean-field and collision term should be added both dynamically and simultaneously. Therefore a self-consistent treatment on both of them is highly desirable. A model is developed based on the effective Lagrangian, which is simple and tractable, without losing the self-consistency between mean-field part and in medium NN collision part. The formalism is outlined and a modified version of the σ-ω model with momentum and density dependent coupling strengths for scalar and vector fields are introduced. The in-medium NN scattering cross sections based on this model are given. The study of the dynamical and equilibration process in HIC are given. (K.A.). 34 refs., 15 figs., 2 tabs

[en] In terms of first-principles investigation of H-tungsten (W) interaction, we reveal a generic optimal electron density mechanism for H on W(110) surface and at a vacancy in W. Both the surface and vacancy internal surface can provide a quantitative optimal electron density of ∼0.10 electron/ų for H binding to make H stability. We believe that such a mechanism is also applicable to other surfaces such as W(100) surface because of the (100) surface also providing an optimal electron density for H binding, and further likely actions on other metals. (authors)

[en] Highlights: → Vanadium alloy is the most promising candidate structural material in fusion. → The mechanical property is very important on designing vanadium material. → We have investigated ideal mechanical properties of vanadium material. - Abstract: We employ first-principles total energy method based on the density functional theory with the generalized gradient approximation to investigate the ideal tensile strengths of a bcc vanadium (V) single crystal systemically. The ideal tensile strengths are calculated to be 19.1, 32.8 and 31.0 GPa for bcc V in the [1 0 0], [1 1 0] and [1 1 1] directions, respectively. We show that the [0 0 1] direction is the weakest direction due to the occurrence of structure transition at the lower strain and the [1 1 0] direction is strongest because of the stronger interaction of atoms between the (1 1 0) planes in comparison with the (0 0 1) and (1 1 1) planes. We derive the Young's modulus formula V single crystal in different tensile directions and give detailed analysis. According to the elastic constants of V single crystal, we have estimated some mechanical quantities of polycrystalline V, which are the bulk modulus of B, the shear modulus of G, Young's modulus of E and the Poisson's ratio of ν. The results might provide a useful reference for V as a candidate structural material in the fusion Tokamak.