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Труды сотрудников Института теплофизики УрО РАН
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Труды сотрудников ЦНБ УрО РАН
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Каталог библиотеки ИЭРиЖ УрО РАН
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Общее количество найденных документов : 60
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1.
Инвентарный номер: нет.
   
   S 94

   
    Surface tension of an ethane–nitrogen solution. 1: Experiment and thermodynamic analysis of the results [Electronic resource] / V. G. Baidakov, A. M. Kaverin, M. N. Khotienkova, V. N. Andbaeva // Fluid Phase Equilibria. - 2012. - Vol.328. - P13-20
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SURFACE TENSION -- CAPILLARY CONSTANT -- ETHANE–NITROGEN SOLUTION
Аннотация: The differential variation of the method of capillary rise has been employed to measure the capillary constant and calculate the surface tension of ethane–nitrogen solutions. Experiments have been conducted in the temperature range from 93.15 K to 283.15 K at pressures up to 4 MPa. The (p, T)-projection of the line of three-phase liquid–liquid–vapor equilibrium and the surface tension at a liquid–vapor interface close to this line have been determined. Equations are developed which describe the dependence of the capillary constant and the surface tension on the temperature, pressure, and composition of the liquid phase. Experimental data on the surface tension are analyzed in the framework of thermodynamic m

\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2012, v.328, p. 13-20.pdf
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2.
Инвентарный номер: нет.
   
   S 94

   
    Surface tension of an ethane–nitrogen solution. 1: Experiment and thermodynamic analysis of the results [Electronic resource] / V. G. Baidakov, A. M. Kaverin, M. N. Khotienkova, V. N. Andbaeva // Fluid Phase Equilibria. - 2012. - Vol.328. - P13-20
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SURFACE TENSION -- CAPILLARY CONSTANT -- ETHANE–NITROGEN SOLUTION
Аннотация: The differential variation of the method of capillary rise has been employed to measure the capillary constant and calculate the surface tension of ethane–nitrogen solutions. Experiments have been conducted in the temperature range from 93.15 K to 283.15 K at pressures up to 4 MPa. The (p, T)-projection of the line of three-phase liquid–liquid–vapor equilibrium and the surface tension at a liquid–vapor interface close to this line have been determined. Equations are developed which describe the dependence of the capillary constant and the surface tension on the temperature, pressure, and composition of the liquid phase. Experimental data on the surface tension are analyzed in the framework of thermodynamic m

\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2012, v.328, p. 13-20.pdf
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3.
Инвентарный номер: нет.
   
   S 61

   
    Simulation of radial pulsed magnetic compaction of a granulated medium in a quasi-static approximation [Electronic resource] / G. Sh. Boltachev, N. V. Volkov, S. V. Dobrov, V. V. Ivanov, A. A. Nozdrin, S. N. Paranin // Technical Physics. - 2007. - Vol. 52, № 10. - P1306-1315
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MAGNETIC COMPACTION
Аннотация: Compression adiabats for alumina-based nanopowders are obtained experimentally, various conditions of pulsed magnetic cylindrically symmetric radial compaction of the nanopowders are tested, and the density distribution in the compacted powders are measured. Using the compression adiabats obtained, quasi-static compaction of a granulated (porous) medium, which is considered to be compact, is simulated. The conditions of uniform and equilibrium compaction on a rigid rod are analyzed. The voidage distribution, stress tensor, and amount of accumulated deformation are calculated. The features of nanopowder compaction, specifically, the presence (absence) of voidage nonuniform radial distribution, are explained.

\\\\Expert2\\NBO\\Technical Physics\\2007, v.52, N 10, p.1306.pdf
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4.
Инвентарный номер: нет.
   
   S 61

   
    Simulation of radial pulsed magnetic compaction of a granulated medium in a quasi-static approximation [Electronic resource] / G. Sh. Boltachev, N. V. Volkov, S. V. Dobrov, V. V. Ivanov, A. A. Nozdrin, S. N. Paranin // Technical Physics. - 2007. - Vol. 52, № 10. - P1306-1315
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MAGNETIC COMPACTION
Аннотация: Compression adiabats for alumina-based nanopowders are obtained experimentally, various conditions of pulsed magnetic cylindrically symmetric radial compaction of the nanopowders are tested, and the density distribution in the compacted powders are measured. Using the compression adiabats obtained, quasi-static compaction of a granulated (porous) medium, which is considered to be compact, is simulated. The conditions of uniform and equilibrium compaction on a rigid rod are analyzed. The voidage distribution, stress tensor, and amount of accumulated deformation are calculated. The features of nanopowder compaction, specifically, the presence (absence) of voidage nonuniform radial distribution, are explained.

\\\\Expert2\\NBO\\Technical Physics\\2007, v.52, N 10, p.1306.pdf
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5.
Инвентарный номер: нет.
   
   S 34

    Schmelzer, J. W. P.
    Classical and generalized Gibbs' approaches and the work of critical cluster formation in nucleation theory [Electronic resource] / J. W. P. Schmelzer, G. Sh. Boltachev, V. G. Baidakov // Journal of Chemical Physics. - 2006. - Vol. 124, № 19. - P194503/1-194503/18
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CLUSTERS
Аннотация: In the theoretical interpretation of the kinetics of first-order phase transitions, thermodynamic concepts developed long ago by Gibbs are widely employed giving some basic qualitative insights into these processes. However, from a quantitative point of view, the results of such analysis, based on the classical Gibbs approach and involving in addition the capillarity approximation, are often not satisfactory. Some progress can be reached here by the van der Waals and more advanced density functional methods of description of thermodynamically heterogeneous systems having, however, its limitations in application to the interpretation of experimental data as well. Moreover, both mentioned theories—Gibbs’ and density functional approaches—lead to partly contradicting each other’s results. As shown in preceding papers, by generalizing Gibbs’ approach, existing deficiencies and internal contradictions of these two well-established theories can be removed and a new generally applicable tool for the interpretation of phase formation processes can be developed. In the present analysis, a comparative analysis of the basic assumptions and predictions of the classical and the generalized Gibbs approaches is given. It is shown, in particular, that—interpreted in terms of the generalized Gibbs approach—the critical cluster as determined via the classical Gibbs approach corresponds not to a saddle but to a ridge point of the appropriate thermodynamic potential hypersurface. By this reason, the classical Gibbs approach (involving the classical capillarity approximation) overestimates as a rule the work of critical cluster formation in nucleation theory and, in general, considerably.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2006, v.124, p.194503.pdf
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6.
Инвентарный номер: нет.
   
   S 34

    Schmelzer, J. W. P.
    Classical and generalized Gibbs' approaches and the work of critical cluster formation in nucleation theory [Electronic resource] / J. W. P. Schmelzer, G. Sh. Boltachev, V. G. Baidakov // Journal of Chemical Physics. - 2006. - Vol. 124, № 19. - P194503/1-194503/18
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CLUSTERS
Аннотация: In the theoretical interpretation of the kinetics of first-order phase transitions, thermodynamic concepts developed long ago by Gibbs are widely employed giving some basic qualitative insights into these processes. However, from a quantitative point of view, the results of such analysis, based on the classical Gibbs approach and involving in addition the capillarity approximation, are often not satisfactory. Some progress can be reached here by the van der Waals and more advanced density functional methods of description of thermodynamically heterogeneous systems having, however, its limitations in application to the interpretation of experimental data as well. Moreover, both mentioned theories—Gibbs’ and density functional approaches—lead to partly contradicting each other’s results. As shown in preceding papers, by generalizing Gibbs’ approach, existing deficiencies and internal contradictions of these two well-established theories can be removed and a new generally applicable tool for the interpretation of phase formation processes can be developed. In the present analysis, a comparative analysis of the basic assumptions and predictions of the classical and the generalized Gibbs approaches is given. It is shown, in particular, that—interpreted in terms of the generalized Gibbs approach—the critical cluster as determined via the classical Gibbs approach corresponds not to a saddle but to a ridge point of the appropriate thermodynamic potential hypersurface. By this reason, the classical Gibbs approach (involving the classical capillarity approximation) overestimates as a rule the work of critical cluster formation in nucleation theory and, in general, considerably.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2006, v.124, p.194503.pdf
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7.
Инвентарный номер: нет.
   
   M 61

   
    Metastable extension of the liquid-vapor phase equilibrium curve and surface tension [Electronic resource] / V. G. Baidakov, S. P. Protsenko, Z. R. Kozlova, G. G. Chernykh // Journal of Chemical Physics. - 2007. - Vol. 126, № 21. - P214505/1-214505/9
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUID
Аннотация: The method of molecular dynamics has been used to calculate the parameters of liquid-vapor phase equilibrium and the surface tension in a two-phase system of 4096 Lennard-Jones particles. Calculations have been made in a range from the triple point to near-critical temperature and also at temperatures below the triple point corresponding to the metastable equilibrium of a supercooled liquid and supersaturated vapor. To determine the surface tension, along with a mechanical approach a thermodynamic one has been used as well. The latter was based on calculation of the excess internal energy of an interfacial layer. It has been shown that in accuracy the thermodynamic approach is as good as the more sophisticated mechanical one. Low-temperature asymptotics of the phase-equilibrium curve and also of liquid and vapor spinodals have been considered in the Lennard-Jones and the van der Waals models. The behavior of the surface tension and the excess internal energy of an interfacial layer at T>0 is discussed.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2007, v.126, p.214505.pdf
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8.
Инвентарный номер: нет.
   
   M 61

   
    Metastable extension of the liquid-vapor phase equilibrium curve and surface tension [Electronic resource] / V. G. Baidakov, S. P. Protsenko, Z. R. Kozlova, G. G. Chernykh // Journal of Chemical Physics. - 2007. - Vol. 126, № 21. - P214505/1-214505/9
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUID
Аннотация: The method of molecular dynamics has been used to calculate the parameters of liquid-vapor phase equilibrium and the surface tension in a two-phase system of 4096 Lennard-Jones particles. Calculations have been made in a range from the triple point to near-critical temperature and also at temperatures below the triple point corresponding to the metastable equilibrium of a supercooled liquid and supersaturated vapor. To determine the surface tension, along with a mechanical approach a thermodynamic one has been used as well. The latter was based on calculation of the excess internal energy of an interfacial layer. It has been shown that in accuracy the thermodynamic approach is as good as the more sophisticated mechanical one. Low-temperature asymptotics of the phase-equilibrium curve and also of liquid and vapor spinodals have been considered in the Lennard-Jones and the van der Waals models. The behavior of the surface tension and the excess internal energy of an interfacial layer at T>0 is discussed.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2007, v.126, p.214505.pdf
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9.
Инвентарный номер: нет.
   
   C 91

   
    Crystal nucleation rate isotherms in lennard-jones liquids [Electronic resource] / V. G. Baidakov, A. O. Tipeev, K. S. Bobrov, G. V. Ionov // Journal of Chemical Physics. - 2010. - Vol.132, №23. - P234505
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LENNARD-JONES FLUID -- NUCLEUS-LIQUID INTERFACE
Аннотация: We present the results of molecular dynamics simulations of the crystal nucleation rate in a supercooled Lennard-Jones liquid. The nucleation rate as a function of the pressure has been calculated by the method of determining the expectation time for liquid crystallization at temperatures higher than that of the triple point (T∗ = 0.865), close to the temperature of the terminal critical point of the metastable extension of the melting curve (T∗ = 0.55) and below this temperature (T∗ = 0.4). In computer experiments the nucleation rate varied from 1032 to 1035 s−1 m−3. The dimensions of critical nuclei and the pressure inside them, the surface free energy at a critical crystal nucleus-liquid interface, the height of the nucleation barrier, and the Zeldovich factor have been determined from the results of molecular dynamics simulations and their comparison with classical homogeneous nucleation theory. It is shown that the surface free energy at a curved crystal-liquid interface, as distinct from a flat interface, has also been determined at temperatures lower than the temperature of the terminal critical point of the melting curve and is a monotonically increasing function of the temperature

\\\\Expert2\\nbo\\Journal of Chemical Physics\\2010, v.132, p. 234505.pdf
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10.
Инвентарный номер: нет.
   
   C 91

   
    Crystal nucleation rate isotherms in lennard-jones liquids [Electronic resource] / V. G. Baidakov, A. O. Tipeev, K. S. Bobrov, G. V. Ionov // Journal of Chemical Physics. - 2010. - Vol.132, №23. - P234505
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LENNARD-JONES FLUID -- NUCLEUS-LIQUID INTERFACE
Аннотация: We present the results of molecular dynamics simulations of the crystal nucleation rate in a supercooled Lennard-Jones liquid. The nucleation rate as a function of the pressure has been calculated by the method of determining the expectation time for liquid crystallization at temperatures higher than that of the triple point (T∗ = 0.865), close to the temperature of the terminal critical point of the metastable extension of the melting curve (T∗ = 0.55) and below this temperature (T∗ = 0.4). In computer experiments the nucleation rate varied from 1032 to 1035 s−1 m−3. The dimensions of critical nuclei and the pressure inside them, the surface free energy at a critical crystal nucleus-liquid interface, the height of the nucleation barrier, and the Zeldovich factor have been determined from the results of molecular dynamics simulations and their comparison with classical homogeneous nucleation theory. It is shown that the surface free energy at a curved crystal-liquid interface, as distinct from a flat interface, has also been determined at temperatures lower than the temperature of the terminal critical point of the melting curve and is a monotonically increasing function of the temperature

\\\\Expert2\\nbo\\Journal of Chemical Physics\\2010, v.132, p. 234505.pdf
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