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 Найдено в других БД:Каталог книг и продолжающихся изданий (19)Труды Института высокотемпературной электрохимии УрО РАН (33)Труды сотрудников Института органического синтеза УрО РАН (39)Труды сотрудников Института химии твердого тела УрО РАН (57)Расплавы (22)Публикации Черешнева В.А. (11)Публикации Чарушина В.Н. (17)Каталог библиотеки ИЭРиЖ УрО РАН (3)Библиометрия (1)
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Общее количество найденных документов : 52
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1.
Инвентарный номер: нет.
   
   B 74

    Boltachev, G. Sh.
    Analytical model of a corona discharge from a conical electrode under saturation [Электронный ресурс] / G. Sh. Boltachev, N. M. Zubarev // Technical Physics. - 2012. - Vol.57, №11. - P1493-1502
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CONICAL ELECTRODE -- ANALYTICAL MODEL -- ELECTRIC FIELD
Аннотация: Exact partial solutions are found for the electric field distribution in the outer region of a stationary unipolar corona discharge from an ideal conical needle in the space-charge-limited current mode with allowance for the electric field dependence of the ion mobility. It is assumed that only the very tip of the cone is responsible for the discharge, i. e., that the ionization zone is a point. The solutions are obtained by joining the spherically symmetric potential distribution in the drift space and the self-similar potential distribution in the space-charge-free region. Such solutions are outside the framework of the conventional Deutsch approximation, according to which the space charge insignificantly influences the shape of equipotential surfaces and electric lines of force. The dependence is derived of the corona discharge saturation current on the apex angle of the conical electrode and applied potential difference. A simple analytical model is suggested that describes drift in the point-plane electrode geometry under saturation as a superposition of two exact solutions for the field potential. In terms of this model, the angular distribution of the current density over the massive plane electrode is derived, which agrees well with Warburg's empirical law

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2.
Инвентарный номер: нет.
   
   B 74

    Boltachev, G. Sh.
    Analytical model of a corona discharge from a conical electrode under saturation [Электронный ресурс] / G. Sh. Boltachev, N. M. Zubarev // Technical Physics. - 2012. - Vol.57, №11. - P1493-1502
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CONICAL ELECTRODE -- ANALYTICAL MODEL -- ELECTRIC FIELD
Аннотация: Exact partial solutions are found for the electric field distribution in the outer region of a stationary unipolar corona discharge from an ideal conical needle in the space-charge-limited current mode with allowance for the electric field dependence of the ion mobility. It is assumed that only the very tip of the cone is responsible for the discharge, i. e., that the ionization zone is a point. The solutions are obtained by joining the spherically symmetric potential distribution in the drift space and the self-similar potential distribution in the space-charge-free region. Such solutions are outside the framework of the conventional Deutsch approximation, according to which the space charge insignificantly influences the shape of equipotential surfaces and electric lines of force. The dependence is derived of the corona discharge saturation current on the apex angle of the conical electrode and applied potential difference. A simple analytical model is suggested that describes drift in the point-plane electrode geometry under saturation as a superposition of two exact solutions for the field potential. In terms of this model, the angular distribution of the current density over the massive plane electrode is derived, which agrees well with Warburg's empirical law

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3.
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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4.
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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5.
Инвентарный номер: нет.
   
   C 74

   
    Computer simulation of nucleation in a gas-saturated liquid [Electronic resource] / S. P. Protsenko, V. G. Baidakov, A. S. Teterin, E. R. Zhdanov // Journal of Chemical Physics. - 2007. - Vol. 126, № 9. - P094502/1-094502/14
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUID
Аннотация: Molecular dynamics methods have been used to investigate the kinetics of the liquid-gas phase transition in a two-component Lennard-Jones system at negative pressures and elastic stretches of the liquid to values close to spinodal ones. The molecular dynamics system consists of 2048 interacting particles with parameters of the Lennard-Jones potential for argon and neon. Density dependences of pressure and internal energy have been calculated for stable and metastable states of the mixture at a temperature T*?0.7±0.01 and three values of the concentration. The location of mechanical and the diffusion spinodals has been determined. It has been established that a gas-saturated mixture retains its stability against finite variations of state variables up to stretches close to the values near the diffusion spinodal. The statistic laws of the process of destruction of the metastable state have been investigated. The lifetimes of the metastable phase have been determined. It is shown that owing to the small height of the potential barrier that separates the microheterogeneous from the homogeneous state a system of finite size has a possibility to make the reverse transition from the microheterogeneous into the homogeneous state. The lifetimes of the system in the microheterogeneous state, as well as the expectation times of the occurrence of a critical nucleus, are described by Poissonian distributions.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2007, v.126, p.094502, S.P.Protsenko.pdf
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6.
Инвентарный номер: нет.
   
   C 74

   
    Computer simulation of nucleation in a gas-saturated liquid [Electronic resource] / S. P. Protsenko, V. G. Baidakov, A. S. Teterin, E. R. Zhdanov // Journal of Chemical Physics. - 2007. - Vol. 126, № 9. - P094502/1-094502/14
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUID
Аннотация: Molecular dynamics methods have been used to investigate the kinetics of the liquid-gas phase transition in a two-component Lennard-Jones system at negative pressures and elastic stretches of the liquid to values close to spinodal ones. The molecular dynamics system consists of 2048 interacting particles with parameters of the Lennard-Jones potential for argon and neon. Density dependences of pressure and internal energy have been calculated for stable and metastable states of the mixture at a temperature T*?0.7±0.01 and three values of the concentration. The location of mechanical and the diffusion spinodals has been determined. It has been established that a gas-saturated mixture retains its stability against finite variations of state variables up to stretches close to the values near the diffusion spinodal. The statistic laws of the process of destruction of the metastable state have been investigated. The lifetimes of the metastable phase have been determined. It is shown that owing to the small height of the potential barrier that separates the microheterogeneous from the homogeneous state a system of finite size has a possibility to make the reverse transition from the microheterogeneous into the homogeneous state. The lifetimes of the system in the microheterogeneous state, as well as the expectation times of the occurrence of a critical nucleus, are described by Poissonian distributions.

\\\\Expert2\\NBO\\Journal of Chemical Physics\\2007, v.126, p.094502, S.P.Protsenko.pdf
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7.
Инвентарный номер: нет.
   
   C 74

   
    Computer study of physical properties of silicon nanostructures [Текст] / A. E. Galashev, I. A. Izmodenov, A. N. Novruzov, O. A. Novruzova // Semiconductors. - 2007. - Vol. 41, № 2. - С. 190-196
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
PHYSICAL PROPERTIES
Аннотация: The method of molecular dynamics is applied to the study of variations in the physical properties of vitreous and amorphous silicon nanoparticles when heated from 300 to 1700 K. The nanoparticles consist of 300, 400, and 500 atoms. The energy and the average length of the Si-Si bond are calculated, and the average number of bonds per atom is determined. Thermally induced strains tend to change the distribution of the excess potential energy among the concentric layers in the nanoparticles. It is shown that, energetically, the most preferential layer is the middle spherical layer of the “warm” nanoparticle. The temperature behavior of the radial and tangential components of the atomic mobility coefficient in the concentric layers is considered. It is established that there is a liquid layer at the nanoparticle surface in the vicinity of the transition to melting. The vitrified Sin nanoparticles are kinetically more stable than the similar-sized amorphous particles.

\\\\Expert2\\NBO\\Semiconductors (ФТП)\\2007, v.41, N 2, p.190.pdf
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8.
Инвентарный номер: нет.
   
   C 74

   
    Computer study of physical properties of silicon nanostructures [Текст] / A. E. Galashev, I. A. Izmodenov, A. N. Novruzov, O. A. Novruzova // Semiconductors. - 2007. - Vol. 41, № 2. - С. 190-196
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
PHYSICAL PROPERTIES
Аннотация: The method of molecular dynamics is applied to the study of variations in the physical properties of vitreous and amorphous silicon nanoparticles when heated from 300 to 1700 K. The nanoparticles consist of 300, 400, and 500 atoms. The energy and the average length of the Si-Si bond are calculated, and the average number of bonds per atom is determined. Thermally induced strains tend to change the distribution of the excess potential energy among the concentric layers in the nanoparticles. It is shown that, energetically, the most preferential layer is the middle spherical layer of the “warm” nanoparticle. The temperature behavior of the radial and tangential components of the atomic mobility coefficient in the concentric layers is considered. It is established that there is a liquid layer at the nanoparticle surface in the vicinity of the transition to melting. The vitrified Sin nanoparticles are kinetically more stable than the similar-sized amorphous particles.

\\\\Expert2\\NBO\\Semiconductors (ФТП)\\2007, v.41, N 2, p.190.pdf
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9.
Инвентарный номер: нет.
   
   K 75

    Korochkova, E. A.
    Effect of long-range interactions on the surface tension / E. A. Korochkova, G. Sh. Boltachev, V. G. Baidakov // Russian Journal of Physical Chemistry. - 2006. - Vol.80, №3. - С. 445-448
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LIQUID-VAPOR INTERFACE -- CAPILLARY WAVES
Аннотация: The effect of long-range interactions on the surface tension at a liquid-gas interface was considered. An analytical expression for the correction to the surface tension for the cutoff of the particle interaction potential at the distance r(c) was derived based on a step density profile. For the Lennard-Jones fluid, this correction was calculated numerically from the results of computer simulations of the density profiles. It was established that, in the vicinity of the triple point, the correction is as great as similar to 6% at the potential cutoff radius r(c) = 6.78 molecular diameters, a quantity insensitive to the form of the density profile in the interfacial layer

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10.
Инвентарный номер: нет.
   
   K 75

    Korochkova, E. A.
    Effect of long-range interactions on the surface tension / E. A. Korochkova, G. Sh. Boltachev, V. G. Baidakov // Russian Journal of Physical Chemistry. - 2006. - Vol.80, №3. - С. 445-448
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
MOLECULAR-DYNAMICS SIMULATION -- LIQUID-VAPOR INTERFACE -- CAPILLARY WAVES
Аннотация: The effect of long-range interactions on the surface tension at a liquid-gas interface was considered. An analytical expression for the correction to the surface tension for the cutoff of the particle interaction potential at the distance r(c) was derived based on a step density profile. For the Lennard-Jones fluid, this correction was calculated numerically from the results of computer simulations of the density profiles. It was established that, in the vicinity of the triple point, the correction is as great as similar to 6% at the potential cutoff radius r(c) = 6.78 molecular diameters, a quantity insensitive to the form of the density profile in the interfacial layer

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