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1.

Вид документа : Статья из журнала
Шифр издания : 53/Г 15
Автор(ы) : Галашев А. Е., Сервида А., Сигон Ф.
Заглавие : Молекулярно-динамическое изучение электрических потенциалов в кластерах воды, содержащих ион натрия или хлора
Параллельн. заглавия :A molecular-dynamic study of electric potential in water clusters containing a sodium ion or a chlorine ion
Место публикации : Журнал структурной химии. - 1998. - Т. 39, N1. - С. 66-73
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): ионы хлора--ионы натрия--кластеры воды--потенциал электрический--электрический потенциал--метод молекулярной динамики--конструирование--молекулы воды--натрий--na--хлор--cl
Аннотация: Методом молекулярной динамики с конструированием рассчитаны электрические потенциалы изолированных кластеров воды, содержащих Na+ или Cl-. Число молекул воды в кластерах составляло от 4 до 14. Отмечается ведущая роль электростатического взаимодействия в кластерах, определена зависимость диэлектрической постоянной кластера от его размера
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2.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Protsenko S.P., Kozlova Z. R.
Заглавие : The isochoric heat capacity of a metastable Lennard-Jones fluid
Место публикации : Chemical Physics Letters. - 2007. - Vol. 447, № 4-6. - С. 236-240
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): lennard-jones fluid
Аннотация: The article presents the results of molecular-dynamics calculations of the isochoric heat capacity, cv, and the (p, ?, T) – properties of the Lennard-Jones fluid in the region of liquid–gas phase transition in stable and metastable states. The system under investigation contains 2048 particles, the cut-off radius of the potential is chosen equal to 6.78?. The results of computations of the (p, ?, T) – properties have been used to approximate the location of the spinodal. Values of cv have been determined along the gas and the liquid branches of the spinodal. A thermodynamic relation that determines the value of cv on the spinodal in terms of derivatives with respect to temperature of the entropy, pressure and specific volume along the spinodal has been obtained. It is shown that molecular-dynamics data are in agreement with the results of the thermodynamic analysis.????
\\\\Expert2\\NBO\\Chemical Physics Letters\\2007, v. 447, p.236.pdf
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3.

Вид документа : Статья из журнала
Шифр издания : 53/C 74
Автор(ы) : Protsenko S.P., Baidakov V. G., Teterin A.S., Zhdanov E.R.
Заглавие : Computer simulation of nucleation in a gas-saturated liquid
Место публикации : Journal of Chemical Physics. - 2007. - Vol. 126, № 9. - С. 094502/1-094502/14
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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 Tsup*/sup?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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4.

Вид документа : Статья из журнала
Шифр издания : 53/S 34
Автор(ы) : Schmelzer J. W. P., Boltachev G. Sh., Baidakov V. G.
Заглавие : Classical and generalized Gibbs' approaches and the work of critical cluster formation in nucleation theory
Место публикации : Journal of Chemical Physics. - 2006. - Vol. 124, № 19. - С. 194503/1-194503/18
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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.

Вид документа : Статья из журнала
Шифр издания : 53/B 74
Автор(ы) : Boltachev G. Sh., Baidakov V. G.
Заглавие : The Second and Third Virial Coefficients of Simple Fluids
Место публикации : High Temperature. - 2006. - Vol. 44, № 1. - С. 83-90
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): fluid condition
Аннотация: The asymptotic behavior of the second B and third C virial coefficients in the low temperature region is analyzed for fluids with a spherical pair-additive potential of interparticle interaction. The temperature dependences B( T) and C( T) are approximated by expressions which convey correctly the behavior of the virial coefficients in the low-and high-temperature limits. The free parameters of approximation formulas for pure nitrogen, argon, and oxygen are determined. The derived virial equations of state are used to calculate the limit of significant instability of the gas phase in a wide temperature range.
\\\\Expert2\\NBO\\High Temperature\\2006, v.44, p.83.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Boltachev G. Sh.
Заглавие : Inclusion of corrections of the highest order of smallness in the Van der Waals capillarity theory
Место публикации : High Temperature. - 2005. - Vol. 43, № 4. - С. 538-545
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): van-der-waals chain-molecule fluid
Аннотация: An extended version of the Van der Waals capillarity theory is suggested, which describes the liquid-vapor interface in the temperature range from the triple to critical point. A model functional of thermodynamic potential of a two-phase Lennard-Jones system is suggested, which takes into account the impact of higher terms of gradient expansion. The identity of the thermodynamic and mechanical definitions of the Tolman parameter is proved within the accepted form of the functional. The properties of the liquid and vapor phase nuclei are described. The work of nucleation, the density profiles, and the dimensional dependence of surface tension are determined.
\\\\Expert2\\NBO\\High Temperature\\2005, v.43, p.538.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Boltachev G. Sh.
Заглавие : Extended version of the Van der Waals capillarity theory
Место публикации : Journal of Chemical Physics. - 2004. - Vol. 121, № 17. - С. 8594-8601
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): van-der-waals chain-molecule fluid
Аннотация: An extended version of the van der Waals capillarity theory describing the liguid-vapor interface in the temperature range from the triple to the critical point is suggested. A model functional of thermodynamic potential for a two-phase Lennard-Jones system taking into account the effect of the highest degree terms of gradient expansion has been constructed. The identity of the thermodynamic and the mechanical definition of Tolman’s length has been proved in the framework of the adopted form of functional. The properties of nuclei of the liquid and the vapor phase are described. The paper determines: the work of formation of a nucleus, density profiles, size dependences of the surface tension, and the parameter ? in the Gibbs-Tolman-Koenig-Buff equation.© 2004 American Institute of Physics.
\\\\Expert2\\NBO\\Journal of Chemical Physics\\2004, v.121, p.8594, V. G. Baidakov.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 53/B 74
Автор(ы) : Boltachev G. Sh., Zubarev N.M., Zubareva O. V.
Заглавие : Space charge influence on the angle of conical spikes developing on a liquid-metal anode
Место публикации : Physical Review E: Statistical, Nonlinear, and Soft Matter Physics. - 2008. - Vol. 77, № 5-2. - С. 056607/1-056607/10
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): argon
Аннотация: The influence of the space charge of ions emitted from the surface of a conical spike on its shape has been studied. The problem of the calculation of the spatial distributions of the electric field, ion velocity field, and the space charge density near the cone tip has been reduced to the analysis of a system of ordinary differential equations. As a result of numerical solution of these equations, the criterion for the balance of the capillary and electrostatic forces on the conic surface of a liquid-metal anode has been determined. It has allowed us to relate the electrical current flowing through the system, the applied potential difference, and the cone angle. We have compared the results of our calculations with available experimental data concerning emission from the surface of pure liquid gallium, indium, tin, and some liquid alloys, such as Au+Si, Co+Ge, and Au+Ge. On the basis of the proposed model, explanations have been given for a number of specific features of the emissive behavior of different systems.
\\\\Expert2\\NBO\\Physical Review E\\2008, v.77, N 5, p.056607.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 53/C 74
Автор(ы) : Galashev A. E., Izmodenov I. A., Novruzov A. N., Novruzova O. A.
Заглавие : Computer study of physical properties of silicon nanostructures
Место публикации : Semiconductors. - 2007. - Vol. 41, № 2. - С. 190-196
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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 Sisubn/sub 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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10.

Вид документа : Статья из журнала
Шифр издания : 53/D 23
Автор(ы) : Dashevskaya E., Litvin I., Nikitin E. D.
Заглавие : Gyroscopic Effect in Low-Energy Classical Capture of a Rotating Quadrupolar Diatom by an Ion
Место публикации : Journal of Physical Chemistry A. - 2006. - Vol. 110, № 9. - С. 2876-2884
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): gyroscopic effect
Аннотация: The low-energy capture of homonuclear diatoms by ions is due mainly to the long-range part of the interpartner potential with leading terms that correspond to charge?quadrupole interaction and charge-induced dipole interaction. The capture dynamics is described by the perturbed-rotor adiabatic potentials and the Coriolis interaction between manifold of states that belong to a given value of the intrinsic angular momentum. When the latter is large enough, it can noticeably affect the capture cross section calculated in the adiabatic channel approximation due to the gyroscopic property of a rotating diatom. This paper presents the low-energy (low-temperature) state-selected partial and mean capture cross sections (rate coefficients) for the charge?quadrupole interaction that include the gyroscopic effect (decoupling of intrinsic angular momentum from the collision axis), quantum correction for the diatom rotation, and the correction for the charge-induced dipole interaction. These results complement recent studies on the gyroscopic effect in the quantum regime of diatom?ion capture
\\\\Expert2\\NBO\\Journal of Physical Chemistry A\\2006, v.110 p.2876.pdf
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