2018 жыл
| № | Мақаланың тақырыбы | Авторлары | Жылы | Журнал атауы | Қысқаша аннотация |
| 1 | Dynamical conductivity of the dense semiclassical plasmas on the basis of the effective potential | Shalenov, E.O., Dzhumagulova, K.N., Ramazanov, T.S., Röpke, G., Reinholz, H | 2018 | Physics of Plasmas, Volume 25, Issue 81, August 2018, Article number 082706, Q2. https://doi.org/10.1063/1.5039800 |
New results on the dynamical conductivity and dynamical collision frequency of dense semiclassical hydrogen plasmas on the basis of the effective interaction potential (taking into account screening and diffraction effects) are presented. The electron density n e and temperature T vary in the domains 10 21 cm - 3 < n e < 10 24 cm - 3 and 10 4 K < T < 10 6 K, correspondingly. A semiclassical method has been used for the calculation of the collision frequency. Using a generalized Drude formula, the dynamical conductivity has been investigated. The influence of electron-electron interactions was taken into account at the level of collision frequency via a renormalization factor. The results of the dynamical conductivity show good agreement with the data of other authors, notably with the molecular-dynamics simulation, which also includes electron-electron interactions. |
| 2 | Structural characteristics of strongly coupled ions in a dense quantum plasma | Moldabekov, Z.A., Groth, S., Dornheim, T., Kählert, H., Bonitz, M., Ramazanov, T.S. | 2018 | Physical Review E, Open access, Volume 98, Issue 2, August 27, 2018, Article number 023207, Q1. https://doi.org/10.1103/PhysRevE.98.023207 |
The structural properties of strongly coupled ions in dense plasmas with moderately to strongly degenerate electrons are investigated in the framework of the one-component plasma model of ions interacting through a screened pair interaction potential. Special focus is put on the description of the electronic screening in the Singwi-Tosi-Land-Sjölander (STLS) approximation. Different cross-checks and analyses using ion potentials obtained from ground-state quantum Monte Carlo data, the random phase approximation (RPA), and existing analytical models are presented for the computation of the structural properties, such as the pair distribution and the static structure factor, of strongly coupled ions. The results are highly sensitive to the features of the screened pair interaction potential. This effect is particularly visible in the static structure factor. The applicability range of the screened potential computed from STLS is identified in terms of density and temperature of the electrons. It is demonstrated that at rs>1, where rs is the ratio of the mean interelectronic distance to the Bohr radius, electronic correlations beyond RPA have a nonnegligible effect on the structural properties. Additionally, the applicability of the hypernetted chain approximation for the calculation of the structural properties using the screened pair interaction potential is analyzed employing the effective coupling parameter approach. |
| 3 | Theoretical foundations of quantum hydrodynamics for plasmas | Moldabekov, Z.A., Bonitz, M., Ramazanov, T.S. | 2018 | Physics of Plasmas, Open access, Volume 25, Issue 3, March 1, 2018, Article number 031903, Q2. https://doi.org/10.1063/1.5003910 |
Quantum hydrodynamics (QHD) theory for finite temperature plasmas is consistently derived in the framework of the local density approximation of the free energy with first order density gradient correction. Previously known results are revised and improved with a clear description of the underlying approximations. A fully non-local Bohm potential, which goes beyond all previous results and is linked to the electron polarization function in the random phase approximation, for the QHD model is presented. The dynamic QHD exchange correlation potential is introduced in the framework of local field corrections and considered for the case of the relaxation time approximation. Finally, the range of applicability of the QHD is discussed. |
| 4 | The Effect of Magnetic Field on Dust Dynamic in the Edge Fusion Plasma | Kodanova, S.K., Bastykova, N.Kh., Ramazanov, T.S., Nigmetova, G.N., Maiorov, S.A | 2018 | IEEE Transactions on Plasma Science, Volume 46, Issue 4, Pages 832 - 834, April 2018, Q2. https://doi.org/10.1109/TPS.2017.2763965 |
In this paper, the effect of the magnetic field on dust dynamic and lifetime in the edge fusion plasma has been studied. A computational model of tungsten dust evolution formed on the surface of the reactor wall was constructed on the basis of particle-in-cell and Monte Carlo methods. The time dependence of the characteristic parameters (charge, temperature and radius, and heat fluxes) of the dust particle was determined. On the basis of these calculations, estimates of the tungsten dust lifetime in the edge fusion plasma were made. It was found that the magnetic field can have a significant effect on charging processes and lifetime of dust particles in the edge fusion plasma. The obtained results show that the larger the dust particle size, the stronger the magnetic field affects its charge, which leads to the suppression of the heat flux of plasma particles on the dust surface and an increase in its lifetime. Also, the magnetic field increases the charging time of small dust particles due to the limitation of the trajectory along the magnetic field lines. |
| 5 | Relaxation of non-isothermal hot dense plasma parameters | Kodanova, S.K., Issanova, M.K., Amirov, S.M., Ramazanov, T.S., Tikhonov, A., Moldabekov, Z.A | 2018 | Matter and Radiation at Extremes, Open access, Volume 3, Issue 1, Pages 40 - 49, January 2018, Q1. https://doi.org/10.1016/j.mre.2017.07.005 |
The relaxation of temperature, coupling parameters, the excess part of equation of state, and the correlation energy of the non-isothermal hot dense plasmas are considered on the basis of the method of effective interaction potentials. The electron–ion effective interaction potential for the hot dense plasma is discussed. The accuracy of description of the dense plasma properties by the effective electron–ion interaction potential is demonstrated by the agreement of the derived quantities like stopping power and transport coefficients calculated using our methodology with the results of the finite-temperature Kohn-Sham density-functional theory molecular dynamics, and orbital-free molecular dynamics results as well as with the data obtained using other theoretical approaches. |
| 6 | Dust particles of finite dimensions in complex plasmas: Thermodynamics and dust-acoustic wave dispersion | Davletov, A.E., Yerimbetova, L.T., Arkhipov, Yu.V., Mukhametkarimov, Ye.S., Kissan, A., Tkachenko, I.M | 2018 | Journal of Plasma Physics, Volume 84, Issue 41, August 2018, Article number 905840410, Q2. https://doi.org/10.1017/S0022377818000879 |
Grounded on the premise that dust particles are charged hard balls, the analysis in Davletov et al. (Contrib. Plasma Phys., vol. 56, 2016, 308) provides an original pseudopotential model of intergrain interaction in complex (dusty) plasmas. This accurate model is engaged herein to consistently treat the finite-size effects from the process of dust particle charging to determination of the thermodynamic quantities and the dust-acoustic wave dispersion in the strongly coupled regime. The orbital motion limited approximation is adopted to evaluate an electric charge of dust grains immersed in a neutralizing background of the buffer plasma. To account for finite dimensions of dust particles, the radial distribution function is calculated within the reference hypernetted-chain (RHNC) approximation to demonstrate a well-pronounced short-range order formation at rather large values of the coupling parameter and the packing fraction. The evaluated excess pressure of the dust component is compared to the available theoretical approaches and the simulation data and is then used to predict the dust-acoustic wave (DAW) dispersion in the strongly coupled regime under the assumption that the dust particles charge varies in the course of propagation. In contrast to many previous investigations, it is demonstrated for the first time ever that for DAWs the charge variation of dust particles should necessarily be taken into account while evaluating the dust isothermal compressibility. |
| 7 | Chemical model for positively charged dust particles | Davletov, A.E., Kurbanov, F., Mukhametkarimov, Y.S. | 2018 | Physics of Plasmas, Volume 25, Issue 121, December 2018, Article number 120701, Q2. https://doi.org/10.1063/1.5063848 |
A chemical model of electron-dust plasmas consisting of electrons and dust particles is systematically developed. An insight is exploited that a single dust particle forms a potential well for electrons, whose depth is determined by the work function of the dust material. The whole electron fluid, initially concentrated inside the dust particles, is somehow reallocated between the bulk of the dust matter and the ambient space available, which is then interpreted as thermionic emission. An expression is employed for the Helmholtz free energy of the system, which includes the ideal and excess parts to thoroughly deal with interactions between the dusty plasma constituents. Numerical calculations of dust particle charge are performed in quite a broad domain of plasma parameters, and a straightforward comparison is made with the orbital motion limited (OML) approximation to demonstrate that the proposed calculation scheme predicts higher positive charge values of dust grains. It is also proved that the OML approximation exactly corresponds to the ideal-gas model when interactions between plasma particles are entirely neglected. |
| 8 | The mixed lithium-magnesium imide Li 2 Mg(NH) 2 a promising and reliable hydrogen storage material | Matysina, Z.A., Zaginaichenko, S.Y., Schur, D.V., Veziroglu, T.N., Veziroglu, A., Gabdullin, M.T., Zolotarenko, A.D | 2018 | International Journal of Hydrogen Energy, Volume 43, Issue 33, Pages 16092 - 16106, August 16, 2018. Q1. https://doi.org/10.1016/j.ijhydene.2018.06.168 |
A statistical theory of the structural phase transformations of the imide Li 2 Mg(NH) 2 has been developed, the formation of which is accompanied by the release of free hydrogen. The standard Gibbs free energy formation of the imide's three phases: α, β, γ are calculated. Their dependencies on composition, temperature, pressure, and energy are found. Plots of concentration dependences of the free energy values of these phases are constructed for different temperatures, according to which the imide state diagram is established. Isotherms, isobars and isoplets are investigated. The possibility of hysteresis effect for α and β phases is shown. The results of the calculations are compared with the experimental data. |
| 9 | Sum rules and exact inequalities for strongly coupled one-component plasmas | Arkhipov, Y.V., Ashikbayeva, A.B., Askaruly, A., Bonitz, M., Conde, L., Davletov, A.E., Dornheim, T., Dubovtsev, D.Y., Groth, S., Santybayev, K., Syzganbayeva, S.A., Tkachenko, I.M. | 2018 | Contributions to Plasma Physics 58, с. 967-975, June 2018, Q2. DOI:10.1002/ctpp.201700136 |
Several sum rules and other exact relations are employed to determine both the static and the dynamic properties of strongly coupled, partially and completely degenerate one‐component plasmas. Emphasis is placed on the electron gas, both at zero and finite temperatures. The procedure is based on the self‐consistent method of moments, recently developed in Phys. Rev. Lett., 2017, 119, 045001, that provides a neat expression for the loss function valid at strong couplings. An input value of the method in its classical version is the static structure factor, whose accuracy is shown to insignificantly affect the resulting numerical data. Starting from the Cauchy‐Bunyakovsky‐Schwarz inequality, a criterion is proposed to verify the quality of various approaches to the evaluation of the static characteristics of one‐component, strongly coupled plasmas. |