Центральная Научная Библиотека УрО РАН

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   T 44


    The equation of state of metastable liquid xenon near the critical point [Text] / V. G. Baidakov, A. M. Rubshtein, V. R. Pomortsev, I. I. Sulla // Physics Letters A. - 1988. - V. 131, N 2. - P119-121

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
УРАВНЕНИЯ СОСТОЯНИЯ -- КСЕНОН МЕТАСТАБИЛЬНЫЙ -- МЕТАСТАБИЛЬНЫЙ КСЕНОН -- КСЕНОН -- ТОЧКИ КРИТИЧЕСКИЕ -- КРИТИЧЕСКИЕ ТОЧКИ -- КСЕНОН ЖИДКИЙ -- ЖИДКИЙ КСЕНОН -- КРИТИЧЕСКИЕ ТОЧКИ -- Xe (КСЕНОН) -- ТЕПЛОФИЗИКА

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   B 16

    Baidakov, V. G.
    An experimental study of the equation of state of superheated liquid methane [Text] / V. G. Baidakov, T. A. Gurina // Journal of Chemical Thermodynamics. - 1989. - V. 21, N 10. - P1009-1016

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
МЕТАН ПЕРЕГРЕТЫЙ -- ПЕРЕГРЕТЫЙ МЕТАН -- УРАВНЕНИЯ СОСТОЯНИЯ -- МЕТАН ЖИДКИЙ -- ЖИДКИЙ МЕТАН -- ТЕПЛОФИЗИКА

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   С 45

    Скрипов, В. П.
    Термодинамика плавления и уравнение Симона [] = The Thermodynamics of Melting and the Simon Equation / В. П. Скрипов, М. З. Файзуллин // Теплофизика высоких температур. - 1999. - Т.37, N5. - С. 814-829

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ТЕРМОДИНАМИКА ПЛАВЛЕНИЯ -- УРАВНЕНИЕ СИМОНА -- ПЕРЕХОД КРИСТАЛЛ-ЖИДКОСТЬ -- ВЕЩЕСТВА ПРОСТЫЕ -- линии плавления -- ИНТЕРВАЛ ТЕМПЕРАТУРНЫЙ -- ПРОДОЛЖЕНИЕ МЕТАСТАБИЛЬНОЕ -- ДАВЛЕНИЕ ОТРИЦАТЕЛЬНОЕ -- ЭНТРОПИЯ -- ПОДОБИЕ ОДНОПАРАМЕТРИЧЕСКОЕ -- ПОДОБИЕ ТЕРМОДИНАМИЧЕСКОЕ -- переходы фазовые
Аннотация: Сделан обзор имеющихся в литературе данных, относящихся к фазовому переходу кристалл-жидкость простых веществ. Линия плавления берется в широком интервале давлений (температур) с учетом ее метастабильного продолжения в области отрицательных давлений. Введение для каждого вещества асимптотического значения давления в низкотемпературном пределе позволяет выявить близкое к универсальности поведение скачка энтропии при разделении. Уравнение Симона выражает идею однопараметрического термодинамического подобия линий плавления. Рассмотрены также особые случаи плавления

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   Б 79

    Болтачев, Г. Ш.
    Уравнение состояния Леннард-Джонсовского флюида [] = Equation of State for Lennard-Jones Fluid / Г. Ш. Болтачев, В. Г. Байдаков // Теплофизика высоких температур. - 2003. - Т. 41, N 2. - 314-316: граф., табл. - Библиогр.: с. 316 (17 назв.) . - ISSN 0040-3644

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ФИЗИКА -- ЛЕННАРД-ДЖОНСОВСКИЙ ФЛЮИД -- ФЛЮИД ЛЕННАРД-ДЖОНСОВСКИЙ -- УРАВНЕНИЕ СОСТОЯНИЯ -- МЕТОД МОНТЕ-КАРЛО -- МОНТЕ-КАРЛО (МЕТОД) -- МЕТОД МОЛЕКУЛЯРНОЙ ДИНАМИКИ

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   С 45

    Скрипов, В. П.
    Определение полюса давления в уравнении Симона через внутреннее давление в жидкости [] = Determination of the Pressure Pole in the Simon Equation from the Internal Pressure in the Liquid / В. П. Скрипов, М. З. Файзуллин // Журнал физической химии. - 2004. - Т. 78, N 2. - 364-368: ил. - Библиогр.: с. 367-368 (33 назв.) . - ISSN 0044-4537

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ФИЗИЧЕСКАЯ ХИМИЯ -- ХИМИЯ ФИЗИЧЕСКАЯ -- ПОЛЮС ДАВЛЕНИЯ -- УРАВНЕНИЕ СИМОНА -- ВНУТРЕННЕЕ ДАВЛЕНИЕ -- ДАВЛЕНИЕ ВНУТРЕННЕЕ -- ДАВЛЕНИЕ ЖИДКОСТИ -- АППРОКСИМАЦИЯ -- ПРЕДЕЛЬНЫЕ УГЛЕВОДОРОДЫ -- УГЛЕВОДОРОДЫ ПРЕДЕЛЬНЫЕ
Аннотация: Выявлена связь полюса давления в уравнении для линии плавления Симона с внутренним давлением жидкости вблизи тройной точки, что позволяет аппроксимировать линии плавления разных веществ в приближении уравнения Симона в широком интервале давления, опираясь на данные, относящиеся к плавлению вещества при атмосферном (нулевом) давлении. Возможности этого подхода продемонстрированы на примере ряда предельных углеводородов (C1, C2, ... C28)

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   С 45

    Скрипов, В. П.
    Термодинамическое уравнение для коэффициента разделения при двухфазном равновесии: приближение идеального раствора [] = Thermodynamic equation for a separation coefficient at the two-phase equilibrium : an ideal solution approximation / В. П. Скрипов // Журнал физической химии. - 1998. - Т. 72, N 11. - С. 2102-2105

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
равновесия двухфазные -- двухфазные равновесия -- КОЭФФИЦИЕНТ РАЗДЕЛЕНИЯ АЛЬФА -- УРАВНЕНИЕ ТЕРМОДИНАМИЧЕСКОЕ -- ТЕРМОДИНАМИЧЕСКОЕ УРАВНЕНИЕ -- РАСТВОР ИДЕАЛЬНЫЙ -- ИДЕАЛЬНЫЕ РАСТВОРЫ -- УРАВНЕНИЕ КЛАЙПЕРОНА-КЛАУЗИУСА -- СИСТЕМА ЖИДКОСТЬ-ПАР -- РАВНОВЕСИЕ ФАЗОВОЕ -- фазовые равновесия -- ТЕМПЕРАТУРА ФАЗОВОГО РАВНОВЕСИЯ -- неидеальные системы
Аннотация: Обобщенное уравнение Клайперона-Клаузиуса для двухкомпонентной системы разрешено относительно коэффициента разделения альфа в приближении идеального раствора. Показана применимость уравнения для неидеальных систем жидкость-пар при малом содержании одного из компонентов. Как частный случай получены известные выражения для смещения температуры фазового равновесия в присутствии малой примеси, не входящей в одну из фаз

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   B 16

    Baidakov, V. G.
    Thermal and caloric equations of state for stable and metastable Lennard-Jones fluids. I. Molecular-dynamics simulations [Electronic resource] / V. G. Baidakov, S. P. Protsenko, Z. R. Kozlova // Fluid Phase Equilibria. - 2008. - Vol. 263, № 1. - P55-63

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EQUATION OF STATE -- COMPUTER SIMULATION -- LENNARD-JONES FLUID -- METASTABLE PHASES -- SPINODALS
Аннотация: The method of molecular dynamics has been used to calculate the pressure, internal energy and isochoric heat capacity of the Lennard–Jones fluid for 208 states in the range of temperatures 0.35 kBT 2.0 and densities 0.001 1.2. The array of data obtained, along with stable states, includes homogeneous metastable states (supersaturated vapor, superheated and supercooled liquid). Spinodals of supersaturated vapor and superheated liquid have been approximated. In a stable region the data obtained are compared with the results of previous papers. The behavior of thermodynamic properties of the fluid in the event of homogeneity disturbance and formation of micro-heterogeneous (“two-phase”) states has been considered.

\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2008, v.263, p.55.pdf
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   B 16

    Baidakov, V. G.
    Extended version of the Van der Waals capillarity theory [Electronic resource] / V. G. Baidakov, G. Sh. Boltachev // Journal of Chemical Physics. - 2004. - Vol. 121, № 17. - P8594-8601

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
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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   N 64

    Nikitin, E. D.
    Critical-Point Measurements for Phenylethanoic to 7-Phenylheptanoic Acids [Текст] / E. D. Nikitin, A. P. Popov, Yu. G. Yatluk // Journal of Chemical & Engineering Data. - 2006. - Vol. 51, № 4. - С. 1335-1338

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ACIDS
Аннотация: The critical temperatures and pressures of phenylalkanoic acids with a straight alkyl chain C6H5(CH2)nCOOH (n = 1 to 6) have been measured. The method of pulse heating of a wire probe placed into the substance under study has been used. The method minimizes the thermal decomposition because residence times are from (0.035 to 1) ms. An equation for the correlation of the critical pressures of phenylalkanoic acids with the number of CH2 groups between phenyl and carboxyl functional groups and molar mass has been obtained. The experimental critical constants of phenylalkanoic acids have been compared with the values calculated by the group-contribution methods of Constantinou and Gani and Marrero and Gani. ??

\\\\Expert2\\NBO\\Journal of Chemical and Engineering Data\\2006, v.51, p.1335.pdf
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10.

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   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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11.

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   S 66

    Skripov, V. P.
    The Generalized Clapeyron-Clausius Equation and Separation Factor for Binary Systems [] / V. P. Skripov // High Temperature. - 1998. - V.36, N6. - С. 898-902

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EQUATION CLAPEYRON-CLAUSIUS GENERALIZED -- SEPARATION FACTOR -- SYSTEM BINARY

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12.

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   S 66

    Skripov, V. P.
    Thermodynamic Similarity and the Line Fusion Equation [] / V. P. Skripov, M. Z. Faizullin // Zhurnal Fizicheskoi Khimii. - 1985. - V.59, Is.3. - С. -598-600

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
THERMODYNAMIC SIMILARITY

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13.

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   E 70

    Ermakov, G. V.
    Boundary of the Stability and Equation of Fluid Condition by Saturation [] / G. V. Ermakov // Zhurnal Fizicheskoi Khimii. - 1984. - V.58, Is.4. - С. 841-844

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EQUATION -- FLUID CONDITION -- SATURATION

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14.

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   B 29

    Bashkatov, N. V.
    Application of the Theory of Thermodynamic Similarity to Construction of the Equation of State for an Overheated Liquid [] / N. V. Bashkatov, T. A. Bebenina, G. V. Ermakov // Zhurnal Fizicheskoi Khimii. - 1982. - V.56, Is.8. - С. 2071-2074

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
THEORY OF THERMODYNAMIC SIMILARITY -- SIMILARITY THERMODYNAMIC -- EQUATION OF STATE -- LIQUID OVERHEATED

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15.

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   S 66

    Skripov, V. P.
    Phase Equilibria in Na-Cellulose Acetate-Water-Alcohol Systems and a Criterion of the Formation of the Liquid Crystalline State [] / V. P. Skripov, M. Z. Faizullin // Russian Journal of Physical Chemistry. - 2005. - V. 79, N 11. - С. 1961-1964: il., tabl. - Bibliogr.: p. 1964 (12 ref.) . - ISSN 0036-0244

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
INTERNAL PRESSURE -- STABILITY OF BOUNDARY -- MELTING CURVE OF METALS
Аннотация: The behavior of the thermodynamic properties of crystalline and liquid sodium was analyzed over a wide range of stable states to estimate the behavior of thermodynamic stability boundaries of both phases under isothermal stretching conditions. A relation between the pressure pole p in the equation for melting curves and the internal pressure pi of the condensed phase close to the triple point was established for a large series of metals

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16.

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   B 16

    Baidakov, V. G.
    The liquid-gas interface of oxygen-nitrogen solutions 2: Description in the Framework of the van der Waals gradient theory [Electronic resource] / V. G. Baidakov, V. N. Andbaeva // Fluid Phase Equilibria. - 2009. - Vol.286, №2. - P175-181

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SURFACE TENSION -- GRADIENT THEORY -- DENSITY PROFILE
Аннотация: The van der Waals gradient theory (vdW GT) is used to calculate surface tension, density profiles, adsorption, the Tolman length and to determine the position of dividing surfaces in the liquid-gas interface of an oxygen-nitrogen solution. The Helmholtz energy density (HED) is determined via an equation of state (EOS), unified for a liquid and gas, which describes stable. metastable and two-phase states of solutions. The influence parameters are calculated from data on the surface tension of pure components with the use of the mixing rule. At temperatures T > 100 K the vdW GT describes experimental data on the surface tension of oxygen-nitrogen solutions [V.G. Baidakov, A.M. Kaverin, V.N. Andbaeva, The liquid-gas interface of oxygen-nitrogen solutions: 1. Surface tension, Fluid Phase Equilib. 270 (2008) 116-120] within the experimental error. It is shown that the Tolman length, which determines the dependence of surface tension on the curvature of the dividing surface, depends considerably on the solution concentration

\\\\Expert2\\nbo\\Fluid Phase Equilibria\\2008, v.286, p.175-181.pdf
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17.

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   B 74

    Boltachev, G. Sh.
    The thermodynamic properties of nitrogen, argon, oxygen, and their mixtures in the region of the liquid-gas phase transition / G. Sh. Boltachev, V. G. Baidakov // Russian Journal of Physical Chemistry. - 2006. - Vol.80, №4. - С. 501-504

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
EQUATION OF STATE -- PRESSURES -- MPA
Аннотация: A procedure for constructing the equation of state for metastable and labile regions in the liquid gas phase transition is suggested. A consistent description of p, rho, T, and caloric properties was obtained. The spinodals of both pure fluids and their mixtures were located

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18.

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   B 16

    Baidakov, V. G.
    Experimental investigations of nucleation in helium-oxygen mixtures / V. G. Baidakov, A. M. Kaverin, G. Sh. Boltachev // Journal of Physical Chemistry B. - 2002. - Vol.106, №1. - С. 167-175

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SUPERSATURATED SOLUTIONS -- HOMOGENEOUS NUCLEATION -- SURFACE TENSION
Аннотация: The paper presents the results of experimental investigations of nucleation in helium-oxygen gas-filled mixtures. Temperature dependences of the mean lifetime of a mixture in the metastable (superheated) state have been determined, and nucleation rates have been calculated by experiments at fixed pressures of 1.171 and 1.667 MPa and at several values of concentrations. Experimental data are compared with results of the homogeneous nucleation theory in a macroscopic (capillary) approximation and with allowance for the dependence of the properties of nuclei on the curvature of their dividing surface. The size effect of nucleation is taken into account in the framework of the van der Waals, Cahn-Hilliard method. The equation of state of the mixture has been built, and the boundary of stability of homogeneous states, the diffusion spinodal, has been determined. The paper discusses the problems of building a nucleation theory for gas-filled mixtures and states a good agreement between theory and experiment at nucleation rates J similar or equal to 10(7) m(-1) s(-1) when the size effect in nucleation is taken into account

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19.

Инвентарный номер: нет.

   B 16

    Baidakov, V. G.
    Comparison of Different Approaches to the Determination of the Work of Critical Cluster Formation / V. G. Baidakov, G. Sh. Boltachev, J. W. P. Schmelzer // Journal of Colloid and Interface Sience. - 2000. - Vol. 231, № 2. - С. 312-321

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL CLUSTER -- GIBBS' METHOD -- NUCLEATION RATES
Аннотация: A comparative analysis of the results of determination of the work of critical cluster formation in nucleation theory for three different methods of evaluation—Gibbs' method, the van der Waals-Cahn and Hilliard, and a newly developed modified Gibbs' approach—is given. As a model system for comparison, regular solutions are chosen. In addition to the work of critical cluster formation, the composition of the critical clusters, their characteristic sizes and the values of the surface tension are determined in dependence on the initial supersaturation in the system or, equivalently, on the size of the critical clusters. It is found, in particular, that, for regular solutions, Tolman's equation cannot serve as a first approximation for the description of the curvature dependence of the surface tension even for large cluster sizes and an alternative formula is developed. It is shown that the latter two mentioned methods of determination of the work of critical cluster formation (the van der Waals-Cahn and Hilliard and the modified Gibbs' approach) lead—at least for the model system considered—to qualitatively and partly quantitatively equivalent results. Nevertheless, differences remain which may lead to quantitative deviations when applied to the determination of the steady-state nucleation rates. The possible origin of such deviations is discussed and some further directions of analysis are anticipated

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20.

Инвентарный номер: нет.

   B 74

    Boltachev, G. Sh.
    Equation of State for Lennard-Jones Fluid / G. Sh. Boltachev, V. G. Baidakov // High Temperature. - 2003. - Vol.41, №2. - С. 270-272

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LENNARD-JONES -- FLUID CONDITION -- EQUATION

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21.

Инвентарный номер: нет.

   B 74

    Boltachev, G. Sh.
    First-order curvature corrections to the surface tension of multicomponent systems / G. Sh. Boltachev, J. W. P. Schmelzer, V. G. Baidakov // Journal of Colloid and Interface Sience. - 2003. - Vol.264, №1. - С. 228-236

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
SURFACE TENSION -- PHASE COEXISTENCE -- MULTICOMPONENT SYSTEMS
Аннотация: The dependence of surface tension on curvature is investigated for the case of an equilibrium phase coexistence in multicomponent systems. Employing Gibbs's method of description of heterogeneous systems, an equation is derived to determine the dependence of surface tension on curvature for widely arbitrary paths of variation of the independent thermodynamic parameters. It is supposed hereby merely that the temperature is kept constant and that the variations of the different molar fractions are such that the radius of the dividing surface varies monotonically in dependence on the change of the state parameters of the ambient phase along any of the chosen paths. In the analysis, an approach developed by Blokhuis and Bedeaux for one-component systems is utilized. It relies on the expansion of the surface free energy on curvature of the dividing surface. An equation is derived that connects the first-order correction term in the expansion with the interaction potential of the particles in the multicomponent solution and with the two-particle distribution functions in the planar interfacial layer between the two phases coexisting in equilibrium at planar interfaces. The connection of the first-order curvature correction to the surface tension and the first moment of the pressure tensor at a planar interface is analyzed as well

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22.

Инвентарный номер: нет.

   S 81


    Statistical substantiation of the van der Waals theory of inhomogeneous fluids / V. G. Baidakov, S. P. Protsenko, G. G. Chernykh, G. Sh. Boltachev // Physical Review E: Statistical, Nonlinear, and Soft Matter Physics. - 2002. - Vol.65, №4. - С. 041601-041617

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LENNARD-JONES FLUID -- VAN-DER-WAALS THEORY -- MOLECULAR DYNAMICS
Аннотация: Computer experiments on simulation of thermodynamic properties and structural characteristics of a Lennard-Jones fluid in one- and two-phase models have been performed for the purpose of checking the base concepts of the van der Waals theory. Calculations have been performed by the method of molecular dynamics at cutoff radii of the intermolecular potential rc,1=2.6σ and rc,2=6.78σ. The phase equilibrium parameters, surface tension, and density distribution have been determined in a two-phase model with a flat liquid-vapor interface. The strong dependence of these properties on the value of rc is shown. The p,ρ,T properties and correlation functions have been calculated in a homogeneous model for a stable and a metastable fluid. An equation of state for a Lennard-Jones fluid describing stable, metastable, and labile regions has been built. It is shown that at T>~1.1 the properties of a flat interface within the computer experimental error can be described by the van der Waals square-gradient theory with an influence parameter κ independent of the density. Taking into account the density dependence of κ through the second moment of the direct correlation function will deteriorate the agreement of the theory with data of computer simulation. The contribution of terms of a higher order than (∇ρ)2 to the Helmholtz free energy of an inhomogeneous system has been considered. It is shown that taking into account terms proportional to (∇ρ)4 leaves no way of obtaining agreement between the theory and simulation data, while taking into consideration of terms proportional to (∇ρ)6 makes it possible to describe with adequate accuracy all the properties of a flat interface in the temperature range from the triple to the critical point

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23.

Инвентарный номер: нет.

   C 20


    Capillary Constant of a Xenon–Helium Solution [Electronic resource] / V. G. Baidakov, A. M. Kaverin, V. N. Andbaeva, M. N. Khotienkova // Journal of Chemical & Engineering Data. - 2011. - Vol.56, №11. - P4123-4125

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CAPILLARY METHOD -- XENON–HELIUM SOLUTION
Аннотация: The differential capillary method has been used to measure the capillary constant of a xenon–helium solution. Experiments have been conducted in the temperature range from (165 to 267) K at pressures up to 4 MPa. An equation approximating the baric dependence of the capillary constant has been suggested

\\\\Expert2\\nbo\\Journal of Chemical and Engineering Data\\2011, v.56, p. 4123-4125.pdf
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24.

Инвентарный номер: нет.

   K 79

    Koverda, V. P.
    Statistics of low-frequency pulsations in critical regimes of heat mass exchange with phase transitions / V. P. Koverda, V. N. Skokov, A. V. Reshetnikov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 130 -138

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
FLUCTUATION -- IRREGULAR HIGH-ENERGY -- 1 / F СПЕКТРЫ
Аннотация: Experimental investigation of fluctuation dynamics in critical and transitional modes of heat mass exchange shows existence of irregular high-energy pulsations with power spectrum inversely proportional to the frequency—so called 1/f spectrum. Such regimes are characterized by the fact that an essential part of the pulsations energy is connected with very slow processes and mean that large high-energy bursts are possible in the system. Another characteristic feature of such regimes is scale invariance of the fluctuations distribution function. According to the theory, the 1/f fluctuations can emerge in physical systems due to simultaneous phase transitions in presence of sufficiently intensive white noise. This paper is devoted to detailed investigation of relaxation processes at steadying of stationary stochastic process in non-equilibrium phase transitions in system of two nonlinear stochastic differential equation. Such an information reveals statistical patterns of particular large-scale low-frequency bursts. Discontinuous “forgetting” of the initial conditions takes place. It is shown by numerical methods that distributions of duration and maximal values of the low-frequency extreme bursts have the power-like form. Experimental investigation results of statistical characteristics of fluctuation processes at ultrasonic cavitation and flash boiling of overheated water jets are presented. Results of the experiments carried out fit conclusions of the theoretical model for interacting heterogeneous phase transitions

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25.

Инвентарный номер: нет.

   N 64

    Nikitin, E. D.
    Using the phenomenon of liquid superheat to measure critical properties of substances / E. D. Nikitin, A. P. Popov // Journal of Engineering Thermophysics. - 2007. - Vol.16, №3. - С. 200-204

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL TEMPERATURES -- R1(CH2)nR2
Аннотация: A method to measure the critical temperature and critical pressure of substances, in particular, thermally unstable ones, is briefly described. The method is used to measure the temperature of attainable superheat of liquids with the help of a wire probe heated by electric current pulses. As the pressure increases, the temperature of attainable superheat tends to a critical temperature. The duration of the heating pulses is from 0.03 to 1 ms. A list of about 130 substances for which measurements of the critical properties were made is presented. The results of these measurements confirmed the scaling form of the relation between the critical constants of substances consisting of long chain molecules and the number of molecular units. Two methods to extrapolate the experimental data for the critical properties of the initial members of homologous series to heavier polymer homologs are proposed. One of the methods is based on the equation of state for the fluid of chain molecules. In this method, the extrapolating equations are power series in n, where n is the number of main units in a chain molecule. In the other method, the hypothesis of functional self-similarity and the presentation of scaling behavior of the critical constants of long chain molecules are used. Homologous series with the general formula R1 (CH2)nR2, where R1 and R2 are different end groups, are considered. We obtain equations to calculate, with good accuracy, the critical temperature and critical pressure of any member of any homologous series with the molecule structure R1(CH2)nR2 if they are known for one compound belonging to this series

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26.

Инвентарный номер: нет.

   Y 14

    Yakoumis, I. V.
    Validation of a recent generalized expression of Tc/Pc vs. the van der Waals surface area according to recent measurements / I. V. Yakoumis, E. D. Nikitin, G. M. Kontogeorgis // Fluid Phase Equilibria. - 1998. - Vol.153, №1. - С. 23-27

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CRITICAL PROPERTIES -- VAPOUR–LIQUID EQUILIBRIA
Аннотация: Recently, Kontogeorgis et al. [G.M. Kontogeorsis, I.V. Yakoumis, P. Coustikos, D.P. Tassios, Fluid Phase Equilibria, 140 (1–2) (1997) 145–146] developed a generalized expression for the ratio of the critical temperature to the critical pressure (Tc/Pc) with the van der Waals surface area (Qw). Despite the extensive database involved in the development of this equation, the heaviest compounds involved were n-tetracosane in terms of Tc/Pc ratio and PEG-400 in terms of highest Tc. The maximum Tc/Pc value was below 100. The correlation is further validated in light of recent critical data appearing in the literature for heavy compounds with Tc/Pc ratio up to 185. The satisfactory agreement between experimental and predicted Tc/Pc ratios justifies its application to high molecular weight compounds other than those employed for its development

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27.

Инвентарный номер: нет.

   B 16

    Baidakov, V. G.
    Metastable Lennard-Jones fluids. I. Shear viscosity [Electronic resource] / V. G. Baidakov, S. P. Protsenko, Z. R. Kozlova // Journal of Chemical Physics. - 2012. - Vol.137, №16. - P164507

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
LIQUIDS -- GLASS -- CRYSTALS
Аннотация: Molecular dynamics methods have been employed to calculate the coefficient of shear viscosity ηs* of a Lennard-Jones fluid. Calculations have been performed in the range of reduced temperatures 0.4 ⩽ kBT/ɛ ⩽ 2.0 and densities 0.01 ≤ ρσ3 ≤ 1.2. Values of ηs* have been obtained for 217 states, 99 of which refer to metastable liquid and gas regions. The results of calculating ηs* for thermodynamically stable states are in satisfactory agreement with the data of earlier investigations. An equation has been obtained which describes the temperature and density dependence of the coefficient of shear viscosity in stable and metastable regions of the phase diagram up to the boundaries of spontaneous nucleation. The behavior of the coefficient of shear viscosity close to the spinodal of a superheated liquid and supersaturated vapor is discussed and the applicability of the Stokes-Einstein relation at high supercoolings of the liquid phase is examined.

\\\\Expert2\\nbo\\Journal of Chemical Physics\\2012, V.137, p.164507.pdf
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28.

Инвентарный номер: нет.

   K 79

    Koverda, V. P.
    Maximum entropy in a nonlinear system with a 1 f power spectrum [Электронный ресурс] / V. P. Koverda, V. N. Skokov // Physica A. - 2012. - Vol.391, №1-2. - P21-28

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
1/f-NOISE -- MAXIMUM ENTROPY PRINCIPLE -- SELF-ORGANIZED CRITICALITY
Аннотация: An analysis of masterslave hierarchy has been made in a system of nonlinear stochastic equations describing fluctuations with a 1f spectrum at coupled nonequilibrium phase transitions. It is shown that for a system of stochastic equations there exist different probability distribution functions with power-law (non-Gaussian) and Gaussian tails. The governing equation of a system has a probability distribution function with Gaussian tails. Therefore, distribution functions for governing equations may be used for finding the GibbsShannon entropy. The local maximum of this entropy has been found. It corresponds to the tuning of the parameters of the equations to criticality and points to the stability of fluctuations with a 1f spectrum. The Tsallis entropy and the Renyi entropy for the probability distribution functions with power-law tails have been calculated. The parameter q, which is included in the determination of these entropies has been found from the condition that the coordinates of the maximum GibbsShannon entropy coincide with the maxima of the Tsallis and Renyi entropies

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29.

Инвентарный номер: нет.

   K 79

    Koverda, V. P.
    Entropy maximum in a nonlinear system with the 1/f fluctuation spectrum [Электронный ресурс] / V. P. Koverda, V. N. Skokov // Technical Physics. - 2011. - Vol.56, №11. - P1539-1545

ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
FLUCTUATIONS -- 1/f SPECTRUM -- GIBBS-SHANNON INFORMATIONAL ENTROPY
Аннотация: Analysis of the control and subordination is carried out for the system of nonlinear stochastic equations describing fluctuations with the 1/f spectrum and with the interaction of nonequilibrium phase transitions. It is shown that the control equation of the system has a distribution function that decreases upon an increase in the argument in the same way as the Gaussian distribution function. Therefore, this function can be used for determining the Gibbs-Shannon informational entropy. The local maximum of this entropy is determined, which corresponds to tuning of the stochastic equations to criticality and indicates the stability of fluctuations with the 1/f spectrum. The values of parameter q appearing in the definition of these entropies are determined from the condition that the coordinates of the Gibbs-Shannon entropy maximum coincide with the coordinates of the Tsallis entropy maximum and the Renyi entropy maximum for distribution functions with a power dependence

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30.

Инвентарный номер: нет.

   B 16

    Baidakov, V. G.
    An alternative method for the numerical solution of the integrodifferential heat-conduction equation [Electronic resource] / V. G. Baidakov, G. N. Kuvyrkin // USSR Computational Mathematics and Mathematical Physics. - 1990. - Vol.30, №1. - P118-122. - Bibliogr. : p.

ББК 53

Кл.слова (ненормированные):
WAVE FRONT -- UMERICAL SOLUTION -- HEAT-CONDUCTION EQUATION
Аннотация: An algorithm is developed using the finite-element method for calculating the temperature field in a bounded domain allowing for the finite rate of propagation of heat during pulsed surface heating. An accumulating finite element mesh is used in order to remove the oscillations in the solution behind the temperature wave front. An investigation of the error in the calculations enables a rational approach to be taken to the choice of parameters in the integration scheme. Calculations of the propagation and reflection of the temperature waves due to pulsed surface charging are presented

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1-30 31-60 61-64

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