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Vladimir Aristov,Anna Frolova,Sergey Zabelok 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
Simulations of flows on the basis of kinetic equations for mixtures with chemical reactions are performed. The nonuniform relaxationproblems are solved for different variants. The numerical methods of Unified Flow Solver are used for simulation of 1D and 2D flowswith nonequilibrium boundary conditions. The kinetic approach provides results, which are beyond the traditional theory of macroscopicphenomena based on the Navier-Stokes equations. Nonequilibrium flows with anomalous transport properties in relaxation zones aredescribed. A special attention is paid to study of behavior of the nonequilibrium entropy for 1D and 2D cases both for slow and fastchemical reactions and to investigation of it as a measure of complexity of open systems.
Complex Nonequilibrium Flows with Slow and Fast Chemical Reactions studied by Kinetic Methods
V.V.Aristov,A.A.Frolova,S.A.Zabelok 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.10
The present paper studies complex nonequilibrium flows on the basis of the kinetic equations taking into account chemical reactions. Both slow and fast (for which mechanical and chemical relaxation time are of the same order of a magnitude) chemical reactions are considered. Our work is directed towards studying 1D and 2D Nonuniform Relaxation Problems (NRP). The algorithm for numerical simulations in the gases with chemical reactions is implemented within Unifiied Flow Solver (UFS). Flows with the ordinary and anomalous transport properties are investigated for several variants of chemical reactions parameters. A special attention is paid to consideration of the entropy. Comparison of the local magnitudes of nonequilibrium and equilibrium entropy is performed. The value of nonequilibrium entropy provides a characteristics of the complexity of these open systems. This study is focused on nonequilibrium processes keeping in mind simulation of flows in real natural systems.
O.L. Tashlykov,V. Yu. Litovchenko,N.M. Aristov,K.A. Mahmoud Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
Are borate and silicate glasses suitable for working as shieling materials against fast neutrons? To correctly answer the above question, some silicate, and borate-based glasses were fabricated and irradiated with various doses of fast neutrons varied between 1.73 and 12.10 MGy. The color and hardness of the fabricated glasses were affected by the fast neutron fluence where the transparent glasses turned colored as well as the hardness of the fabricated glasses was decreased. The gamma-ray spectrometric analysis shows a high activity concentration produced in the barium borate glasses due to the formation of radioisotopes Ba-131 and Ba-133 reaches to 5.92E+05 Bq and 4.25E+03 Bq, respectively for sample Cd-5 Batch 3. Additionally, the gamma-ray spectrometric analysis for the sodium silicate glasses shows low activity concentrations emitted from isotopes formed due to the activation of Y<sub>2</sub>O<sub>3</sub>-associated impurities. These activities are low compared to that emitted by barium borate-based glasses.
Talantsev, A,Lu, Y,Fache, T,Lavanant, M,Hamadeh, A,Aristov, A,Koplak, O,Morgunov, R,Mangin, S IOP 2018 Journal of Physics, Condensed Matter Vol.30 No.13
<P>Two synthetic antiferromagnet bilayer systems with strong perpendicular anisotropy CoFeB/Ta/CoFeB and Pt/Co/Ir/Co/Pt have been grown using sputtering techniques. For both systems two types of magnetization transitions have been studied. The first one concerns transitions from a state where magnetizations of the two magnetic layers are parallel (<I>P</I> state) to a state where magnetizations of the two layers are aligned antiparallel (<I>AP</I> state). The second one concerns transitions between the two possible antiparallel alignments (<I>AP</I>+ to <I>AP</I>−). For both systems and both transitions after-effect measurements can be understood in the frame of nucleation—propagation model. Time derivative analysis of magnetic relaxation curves and mapping of the first order reversal curves at different temperature allowed us to demonstrate the presence of different pinning centers, which number can be controlled by magnetic field and temperature.</P>