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Поисковый запрос: (<.>K=MPA<.>)
Общее количество найденных документов : 46
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 1-10    11-20   21-30   31-40   41-46 
1.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Attainable Superheat of Argon-Helium, Argon-Neon Solutions [Text] / V. G. Baidakov, A. M. Kaverin, V. N. Andbaeva // Journal of Physical Chemistry B. - 2008. - Vol. 112, № 41. - P12973-12975
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ARGON
Аннотация: The method of lifetime measurement has been used to investigate the kinetics of spontaneous boiling-up of superheated argonhelium and argon?neon solutions. Experiments were made at a pressure of p = 1.5 MPa and concentrations up to 0.33 mol% in the range of nucleation rates from 104 to 108 s1 m3. The homogeneous nucleation regime has been distinguished. With good agreement between experimental data and homogeneous nucleation theory in temperature and concentration dependences of the nucleation rate, a systematic underestimation by 0.250.34 K has been revealed in superheat temperatures over the saturated line attained by experiment as compared with theoretical values calculated in a macroscopic approximation. The revealed disagreement between theory and experiment is connected with the dependence of the properties of new-phase nuclei on their size.

\\EXPERT2\NBO\Journal of Physical Chemistry B\2008, v.112, p.12973.pdf
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2.
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   B 16

    Baidakov, V. G.
    Attainable Superheat of Argon-Helium, Argon-Neon Solutions [Text] / V. G. Baidakov, A. M. Kaverin, V. N. Andbaeva // Journal of Physical Chemistry B. - 2008. - Vol. 112, № 41. - P12973-12975
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ARGON
Аннотация: The method of lifetime measurement has been used to investigate the kinetics of spontaneous boiling-up of superheated argonhelium and argon?neon solutions. Experiments were made at a pressure of p = 1.5 MPa and concentrations up to 0.33 mol% in the range of nucleation rates from 104 to 108 s1 m3. The homogeneous nucleation regime has been distinguished. With good agreement between experimental data and homogeneous nucleation theory in temperature and concentration dependences of the nucleation rate, a systematic underestimation by 0.250.34 K has been revealed in superheat temperatures over the saturated line attained by experiment as compared with theoretical values calculated in a macroscopic approximation. The revealed disagreement between theory and experiment is connected with the dependence of the properties of new-phase nuclei on their size.

\\EXPERT2\NBO\Journal of Physical Chemistry B\2008, v.112, p.12973.pdf
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3.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Attainable Superheating of Liquid Helium–Oxygen Solutions / V. G. Baidakov, A. M. Kaverin // High Temperature. - 2000. - Vol.38, №6. - С. 852-859
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
NUCLEATION -- THEORY OF HOMOGENEOUS NUCLEATION -- BOILING
Аннотация: The results are given of experimental investigations of the kinetics of nucleation in gas-saturated helium-oxygen solutions. The temperature dependences of the mean lifetime of solution in the metastable (superheated) state are determined for fixed values of pressure of 1.171 and 1.667 MPa and for several values of concentration. The experimental data are compared with the theory of homogeneous nucleation in a macroscopic approximation with due regard for the dependence of the properties of the nuclei on their size. The dimensional effect is included within van der Waals' gradient expansion. The problems associated with the construction of the kinetic theory of boiling of gas-saturated solutions are discussed, and good agreement is ascertained between the experimental data and the theory of nucleation when the latter includes the dimensional effect

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4.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Attainable Superheating of Liquid Helium–Oxygen Solutions / V. G. Baidakov, A. M. Kaverin // High Temperature. - 2000. - Vol.38, №6. - С. 852-859
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
NUCLEATION -- THEORY OF HOMOGENEOUS NUCLEATION -- BOILING
Аннотация: The results are given of experimental investigations of the kinetics of nucleation in gas-saturated helium-oxygen solutions. The temperature dependences of the mean lifetime of solution in the metastable (superheated) state are determined for fixed values of pressure of 1.171 and 1.667 MPa and for several values of concentration. The experimental data are compared with the theory of homogeneous nucleation in a macroscopic approximation with due regard for the dependence of the properties of the nuclei on their size. The dimensional effect is included within van der Waals' gradient expansion. The problems associated with the construction of the kinetic theory of boiling of gas-saturated solutions are discussed, and good agreement is ascertained between the experimental data and the theory of nucleation when the latter includes the dimensional effect

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5.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Capillary constant and surface tension of methane-helium solution [Electronic resource] / V. G. Baidakov, K. A. Grishina // Fluid Phase Equilibria. - 2013. - Vol.354. - P245-249. - Bibliogr. : p. 249 (21 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ADSORPTION -- CAPILLARY CONSTANT -- DIFFERENTIAL CAPILLARY METHOD
Аннотация: The differential capillary method has been used to measure the capillary constant a2 of methane-helium solutions in the temperature range from 95 to 175K at pressures up to 4MPa. The surface tension γ and adsorption have been calculated from the obtained values of a2 employing, in addition, literature data on the density of the liquid and vapor phases of the respective solutions. Equations, which approximate the temperature, pressure and concentration dependences of a2 and γ, are proposed

\\\\expert2\\NBO\\Fluid Phase Equilibria\\2013, v.354, p. 245-249.pdf
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6.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Capillary constant and surface tension of methane-helium solution [Electronic resource] / V. G. Baidakov, K. A. Grishina // Fluid Phase Equilibria. - 2013. - Vol.354. - P245-249. - Bibliogr. : p. 249 (21 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ADSORPTION -- CAPILLARY CONSTANT -- DIFFERENTIAL CAPILLARY METHOD
Аннотация: The differential capillary method has been used to measure the capillary constant a2 of methane-helium solutions in the temperature range from 95 to 175K at pressures up to 4MPa. The surface tension γ and adsorption have been calculated from the obtained values of a2 employing, in addition, literature data on the density of the liquid and vapor phases of the respective solutions. Equations, which approximate the temperature, pressure and concentration dependences of a2 and γ, are proposed

\\\\expert2\\NBO\\Fluid Phase Equilibria\\2013, v.354, p. 245-249.pdf
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7.
Инвентарный номер: нет.
   
   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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8.
Инвентарный номер: нет.
   
   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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9.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Nucleation in a superheated nitrogen-helium solution [] / V. G. Baidakov // Chemical Physics Letters. - 2008. - Vol. 462, № 4-6. - С. 201-204
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HELIUM
Аннотация: The method of lifetime measurement has been used to investigate the nucleation of the vapor phase in a superheated liquid nitrogen–helium solution. Temperature dependences of the mean lifetime of a metastable solution have been obtained in experiments at pressures p = 0.5, 1.0 MPa and several values of the mixture concentration. The nucleation rate J has been calculated. It varied in experiments from 104 tо 108 s?1 m?3. The results of experiments are compared with homogeneous nucleation theory. The paper deals with the size effect on the surface tension of a nucleus and the work of its formation.

\\\\Expert2\\nbo\\Chemical Physics Letters\\2008, v. 462, p.201.pdf
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10.
Инвентарный номер: нет.
   
   B 16

    Baidakov, V. G.
    Nucleation in a superheated nitrogen-helium solution [] / V. G. Baidakov // Chemical Physics Letters. - 2008. - Vol. 462, № 4-6. - С. 201-204
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HELIUM
Аннотация: The method of lifetime measurement has been used to investigate the nucleation of the vapor phase in a superheated liquid nitrogen–helium solution. Temperature dependences of the mean lifetime of a metastable solution have been obtained in experiments at pressures p = 0.5, 1.0 MPa and several values of the mixture concentration. The nucleation rate J has been calculated. It varied in experiments from 104 tо 108 s?1 m?3. The results of experiments are compared with homogeneous nucleation theory. The paper deals with the size effect on the surface tension of a nucleus and the work of its formation.

\\\\Expert2\\nbo\\Chemical Physics Letters\\2008, v. 462, p.201.pdf
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