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Общее количество найденных документов : 86
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1.
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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2.
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   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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3.
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   B 74


    Boltachev, G. Sh.
    The Second and Third Virial Coefficients of Simple Fluids [Electronic resource] / G. Sh. Boltachev, V. G. Baidakov // High Temperature. - 2006. - Vol. 44, № 1. - P83-90
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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4.
Инвентарный номер: нет.
   
   B 74


    Boltachev, G. Sh.
    Properties of argon liquid-vapor interface [Electronic resource] / G. Sh. Boltachev, V. G. Baidakov // Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2006. - Vol. 68, № 1. - P26-31
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ARGON
Аннотация: The short-wave cutoff boundary of the capillary wave spectrum is established. Effective thickness L b of the “bare” density profile in the interfacial layer is calculated according to experimental data on the ellipticity ratio of reflected light. The free parameters of the extended van der Waals theory of capillarity are determined. The positions of the equimolecular dividing surface and tension surface are calculated, as well as the temperature dependence of the Tolman parameter.

\\\\Expert2\\NBO\\Colloid Journal\\2006, V.68, N1,26.pdf
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5.
Инвентарный номер: нет.
   
   V 28


   
    Vapor Pressures, Enthalpies of Vaporization, and Critical Parameters of a Series of Linear Aliphatic Dimethyl Esters of Dicarboxylic Acids [Текст] / S. P. Verevkin, S. A. Kozlova, V. N. Emel'yanenko, E. D. Nikitin, A. P. Popov, E. L. Krasnykh // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 5. - С. 1896-1905
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
VAPOR PRESSURES
Аннотация: Vapor pressures and the molar enthalpies of vaporization of the linear aliphatic dimethyl esters of dicarboxylic acids CH3-CO2-(CH2)n-CO2-CH3 with n = (0 to 8) have been determined by the transpiration method. A linear correlation of enthalpies of vaporization (at T = 298.15 K) of the esters studied with the number n and with the Kovat's indices and has been found. The critical temperatures and pressures of the esters with n = (0 to 6) and n = 8 have been measured by the pulse-heating method with the residence times ranging from (0.03 to 1) ms. Experimental data on the critical properties are compared with the estimations by group contribution methods by Constantinou and Gani and by Marrero and Gani. Both methods considerably underestimate the critical temperatures of the esters studied; however, the method by Marrero and Gani provides the prediction of the critical pressures of the esters with an average absolute error approximately equal to the uncertainty of the measurements. ??

\\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1896.pdf
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6.
Инвентарный номер: нет.
   
   N 64


    Nikitin, E. D.
    Critical properties of long-chain substances from the hypothesis of functional self-similarity [Текст] / E. D. Nikitin, P. A. Pavlov, N. S. Bogatishcheva // Fluid Phase Equilibria. - 2005. - Vol. 235, № 1. - С. 1-6
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL STATE -- METHOD OF CALCULATION -- ALKANES -- ALKANOLS -- ALKANONES
Аннотация: A method for the construction of the functions fitting the critical properties of homologous series is presented. The method is based on the hypothesis of functional self-similarity and the scaling behaviour of the critical constants of long-chain molecules. Equations for calculating the critical temperatures and pressures of the homologous series with the common formula H(CH2)nR, where R is a radical have been obtained. The parameters of the equations have been determined from experimental data for six homologous series. The presented method allows predicting the critical temperatures or pressures of any member of a homologous series of the given type if the critical temperature/pressure of one substance, which belongs to this series, is known. The proposed method provides better accuracy in comparison with currently used group-contribution methods for most of the homologous series considered.

\\\\Expert2\\NBO\\Fluid Phase Equilibria\\2005. v.235, p.1-6.pdf
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7.
Инвентарный номер: нет.
   
   F 17


    Faizullin, M. Z.
    The modified Simon equation and some properties of substances on the melting line [Текст] / M. Z. Faizullin, V. P. Skripov // High Temperature. - 2007. - Vol. 45, № 5. - С. 621-627
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SIMON EQUATION
Аннотация: Two versions of modified Simon equation, which contain a correction factor with additional parameters, are suggested for describing the melting lines of elementary substances. It is demonstrated that the generalizations found for the Simon equation (the universality of component ? $$\tilde s$$ 1 of entropy of melting, the convergence of the extreme position of melting line at T > 0 with the limits of thermodynamic stability of coexisting crystal and liquid, and the correlation of the pole of melting line p * with internal pressure p i in the condensed phase in the vicinity of the triple point) retain stability to the variation of the form of dependence p melt = f( T).

\\\\Expert2\\NBO\\High Temperature\\2007, v.45, p.621.pdf
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8.
Инвентарный номер: нет.
   
   P 80


   
    Polymer material laser destruction threshold studies [Текст] / V. P. Efremov, V. E. Privalov, P. V. Skripov, P. V. Charty, V. G. Shemanin // Proceedings of SPIE-The International Society for Optical Engineering. - 2005. - Vol. 5447: Lasers for Measurements and Information Transfer 2004. - С. 234-241
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
POLYMER MATERIALS
Аннотация: The polymer films are widely used in any industry as the construction materials with some specific properties. It demands the detail studies of the laser destruction threshold parameters of such a materials irradiated by the he power laser radiation pulse with energy density in range from 0 up to 200 J/cm2. The probability of the target laser ablation destruction versus the incident laser radiation energy density dependencies for any polymers -- the high pressure polyethylene, epoxy compound, polymethylmetacrylate, styrosil and rubber for comparing -- have been a subject of the experimental studies. The plots of the breakdown probability and plasma emission intensity for all of the samples versus energy density dependences have been got and the breakdown energy density for these targets have been determined by this probability is equal to 0,5 or zero plasma intensity condition. These results show that about 11% of absorbed laser pulse energy was transferred to the target as the shock wave spreading in it when the target thickness is greater than the distance which this shock wave spreads in the time of laser pulse action. ??

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9.
Инвентарный номер: нет.
   
   G 15


    Galashev, A. E.
    Atomic dynamics and the size of metal clusters [] : a computer experiment / A. E. Galashev // Surface (Russia). - 1997. - N2. - С. 5-13
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DYNAMICS ATOMIC -- CLUSTERS METAL -- Na -- Al -- Pb -- CRYSTAL
Аннотация: A computer study of atomic dynamics of metal clusters Na229, Al201 and Pb201 whose intial packing corresponded to extended crystals was carried out. The change of mobility in the radial direction of clusters was inverstigated. A reduction in lattice parameters of clusters Al201, Pb201 and some increase of the size of cluster Na229 have been found

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10.
Инвентарный номер: нет.
   
   K 79


    Koverda, V. P.
    1/f noise at a critical nonequilibrium phase transition [] / V. P. Koverda, V. N. Skokov, V. P. Skripov // JETP Letters. - 1996. - V.63, Is.9. - С. 775-779
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
1/f-NOISE
Аннотация: The generation of 1/f noise is demonstrated experimentally in a system consisting of a superconducting film carrying a transport current in contact with a boiling liquid coolant. It is found that wide-band 1/f noise with a large amplitude of the fluctuations is observed over a wide range of parameters. This noise is attributed to the fact that the sub-systems in contact have the same character of the relaxational dependences delta T(t)similar to t(-1/2)

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