[en] Complete text of publication follows. Hypothetical scenarios for termination of deep metastable melting in Coulomb model at zerotemperature limit (T → 0) are under discussion. Present analysis based on study of topology for combination of melting, boiling and sublimation boundaries in non-standard version of onecomponent plasma model on uniformly compressible background: OCP(∼). In contrast to the widely accepted scenario of metastable melting termination in rare gases and metals, when metastable melting curve reaches actually isotherm T = 0 ('cold curve') of a matter, present work devoted to more plausible scenario of deep metastable melting, titled as 'spinodal decomposition'. Its basic point is unavoidable intersection at finite temperature of metastable liquid melting boundary (liquidus) with spinodal curve of metastable liquid-gas phase transition. Metastable melting at lower temperature is impossible in this case since absolute instability of liquid phase, so that metastable crystal has no where to melt. Two non-standard and more exotic scenarios for metastable melting termination (MMT) are under discussion in addition to two mentioned above MMT scenarios. In the first one (A) hypothetical unique crystal-fluid global phase coexistence is realized as smooth superposition of boiling and sublimation curves (without gas-liquid phase transition and corresponding critical point). In second scenario (B) anomalous non-standard type of 'spinodal decomposition' is realized, when metastable solid binodal (solidus) intersects gaseous spinodal of metastable gas-liquid phase transition. Features of all mentioned above variants of MMT are under discussion as well as hypothetical possibility of direct numerical simulations for such new, exotic MMT-s.

[en] The approach based on the chemical picture of plasma taking into account effects of Coulomb interaction, short range repulsion of atoms and molecules, free electron degeneracy for description of equilibrium composition and thermodynamic functions of non-ideal plasma is proposed. The results of calculations of thermodynamic parameters using the models based upon this approach are presented. The parameters of thermal and caloric equation of state for hydrogen plasma were calculated from moderate to high densities in wide range of temperatures. (copyright 2016 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

[en] Complete text of publication follows. New experimental results on thermodynamics and electrical conductivity of shock and isoentropically compressed hydrogen and deuterium are presented. Strongly coupled plasmas at pressures achieved 18 Mbar, Coulomb coupling parameter exceeded 450, electron degeneracy parameter came up to 290 were obtained with semi-spherical explosive-driven generators. Theoretical models for description of thermodynamics of strongly coupled hydrogen are discussed, comparison of the experimental and theoretical data for strongly non-ideal hydrogen plasmas under high energy density are presented. Experimental and theoretical problems in studying of warm dense hydrogen are discussed. Problems of accurate description of weakly coupled solar plasma on basis of astrophysical observations are discussed as well.

[en] Model SAHA-D based on chemical picture for equation of state of warm dense hydrogen is presented. Coulomb corrections are used via a modified pseudopotential model. Intense short-range repulsion of neutral particles is described in simplified form (soft sphere model). The results of calculations of principal Hugoniots and double shock are compared with experiments and the first principle calculations. Asymptotic properties of the model at high temperature limit are considered (copyright 2010 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

[en] Complete text of publication follows. Model for equation of state of dense strongly coupled plasmas of strongly shock-compressed gases is developed in frames of 'chemical picture'. Shock compressed matter is considered as a multicomponent strongly interacting mixture of atoms, molecules, ions and electrons. Non-ideality due to Coulomb interaction of charged particles, short-range repulsion and attraction of heavy particles in combination with electrons partial degeneracy are taken into account. Modified pseudopotential model is used for description of charged particles non-ideality effects. Contribution for short-range repulsion of heavy particles to thermodynamic functions is taken into account in frames of modified model for soft-spheres mixture. Repulsion parameters were chosen in accordance with recommendations of nonempirical atom-atomic approximation (E. Yakub). Results for calculation of principal and reflected Hugoniots for hydrogen (deuterium), helium and nitrogen are presented. Calculation results are compared with available experimental data and results of direct numerical simulation.

[en] The model SAHA-S based on the chemical picture for the equation of state of the solar plasma is presented. The effects of Coulomb interaction, exchange and diffraction effects, free electron degeneracy, relativistic corrections, radiation pressure contributions are taken into account. The solar model based on SAHA-S taking into account extended element composition and variation of heavy element abundance is represented and discussed. The comparison of the SAHA-S equation of state data for a hydrogen plasma with the results of other models applicable to the description of the solar plasma equation of state and the results obtained with the first principle methods are demonstrated and discussed. (copyright 2013 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)