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Поисковый запрос: (<.>K=SIZE<.>)
Общее количество найденных документов : 70
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1.
Инвентарный номер: нет.
   
   S 66

    Skripov, V. P.
    Size effect on melting of small particles [Text] / V. P. Skripov, V. P. Koverda, V. N. Skokov // Physica Status Solidi (A). - 1981. - V. 66, N 1. - P109-118
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
ЭФФЕКТ РАЗМЕРНЫЙ -- РАЗМЕРНЫ ЭФФЕКТ -- ПЛАВЛЕНИЕ -- частицы малые -- МАЛЕНЬКИЕ ЧАСТИЦЫ (ФИЗИКА) -- ТЕПЛОФИЗИКА

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2.
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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3.
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   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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4.
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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5.
Инвентарный номер: нет.
   
   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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6.
Инвентарный номер: нет.
   
   G 15

    Galashev, A. E.
    Computer investigation of the structure of Si73 clusters surrounded by hydrogen [Текст] / A. E. Galashev, I. A. Izmodenov // Glass Physics and Chemistry. - 2008. - Vol. 34, № 2. - С. 173-181
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HYDROGEN
Аннотация: The stabilization of the structure of Si73 clusters that are surrounded by 60 hydrogen atoms and subjected to seventeenfold stepwise heating from 35 to 1560 K (in steps of ?90 K) is investigated using the molecular dynamics method. The analysis is performed for clusters of three types, i.e., a particle assembled from an icosahedron and a fullerene, a nanocrystal, and a particle with a random atomic packing. In all cases, an increase in the temperature in the course of heating is accompanied by evaporation of a Si atom from the clusters and an increase in the size of silicon particles. The temperature of detachment of Si atoms from clusters is lowest for the cluster with a random atomic packing and highest for the nanocrystal. The nanoassembled particle has the most stable number (close to four) of Si-Si bonds per atom over the entire temperature range 35 ? T ? 1560 K. For each type of Si73 clusters, the mean length of the Si-Si bond decreases with an increase in the temperature. According to the radial distribution functions, the Si73 clusters have different structures even at the temperature T = 1560 K. The distributions of bond angles reflect the presence of fourfold symmetry elements in the nanoassembled cluster and the nanocrystal. The relative depth of “penetration” of hydrogen atoms into the cluster is largest for the nanocrystal and smallest for the nanoassembled nanoparticle. The largest number of hydrogen atoms is “adsorbed” on the particle with a random atomic packing.

\\\\Expert2\\NBO\\Glass Physics and Chemistry\\2008, v. 34, N 2, p.173.pdf
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7.
Инвентарный номер: нет.
   
   N 89

    Novruzov, A. N.
    Computer study of the absorption of ethane by aqueous ultradispersed medium: IR spectra [Текст] / A. N. Novruzov, O. R. Rakhmanova, A. E. Galashev // Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2008. - Vol. 70, № 1. - С. 55-63
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
IR SPECTRA
Аннотация: Absorption of ethane molecules by water clusters containing 10–20 molecules is studied by the molecular dynamics method. The (H2O) n (I), C2H6(H2O) n (II), and (C2H6)2(H2O) n (III) cluster systems are composed on the basis of specific statistical weights. Spectral characteristics of system and single clusters are determined in the frequency range of 0 меньше либо равно омега меньше либо равно 1000 cm в степени -1. In this frequency range, both real and imaginary parts of dielectric permittivity decrease monotonically after the absorption of C2H6 molecules by an aqueous ultradispersed system. Integral coefficient of IR absorption increases, while average (over frequency) reflection coefficient decreases after the absorption of ethane molecules. The intensity of IR scattering by the systems of clusters containing C2H6 molecules lowers. Maximal values of radiation power for water clusters with various sizes are balanced with the capture of ethane molecules by the clusters, whereas oscillations in the size dependence of the density of electrons that are active with respect to IR radiation decrease.

\\\\Expert2\\NBO\\Colloid Journal\\2008, V.70, N 1, 55.pdf
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8.
Инвентарный номер: нет.
   
   G 15

    Galashev, A. E.
    Computer investigation of physical properties of water clusters. 1. Stability [Текст] / A. E. Galashev, O. R. Rakhmanova // Journal of Structural Chemistry. - 2005. - Vol. 46, № 4. - С. 626-632
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
CLUSTERS -- COMPRESSIBILITY -- DIELECTRIC CONSTANT -- DIPOLE MOMENT -- HEAT CAPACITY
Аннотация: The method of molecular dynamics is applied to investigate the stability of water clusters containing up to 90 molecules. With increasing size of aggregates, (H2O) n?10 10, their thermal stability strengthens. Mechanical stability of great clusters keeps the quickly reached level, and the coefficient of dielectric stability passes through the maximum at n = 50.

\\\\Expert2\\NBO\\Journal of Structural Chemistry\\2005, V. 46, N 4, p.626.pdf
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9.
Инвентарный номер: нет.
   
   G 15

    Galashev, A. E.
    Computer Simulation of the Stability of Water Clusters Containing Nitrogen Oxide Molecules [Текст] / A. E. Galashev, V. N. Chukanov // Colloid Journal (Translation of Kolloidnyi Zhurnal). - 2004. - Vol. 66, № 5. - С. 523-530
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
WATER CLUSTERS
Аннотация: The stability of water clusters containing nitrogen oxide molecules is studied by the molecular dynamics method. The composition and size of thermodynamically stable heteroclusters are determined. The inclusion of two molecules of nitrogen oxide into aggregates containing seven or more water molecule increases the cluster stability. The correlation between the stability of heteroclusters and the ratio of self-diffusion coefficients of molecules of different kinds is observed. The real part of the cluster permittivity is maximal in the vicinity of the frequency of 200 cm–1. The inclusion of nitrogen oxide molecules into water clusters increases the characteristic frequency of dielectric relaxation. In general, heteroclusters are more stable with respect to perturbations caused by an external electric field than pure clusters with the same number of water molecules. The clusterization of water vapors accompanied by absorption of polar molecules of impurity favors a decrease in the greenhouse effect.

\\\\Expert2\\NBO\\Colloid Journal\\2004, V.66, N5,523.pdf
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10.
Инвентарный номер: нет.
   
   G 15

    Galashev, A. E.
    Molecular Dynamics Study of Crystallization of Supercooled Liquid Sodium [] / A. E. Galashev, I. P. Chernysheva // Inorganic Materials. - 1999. - V.35, N1. - С. 42-48
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
STUDY MOLECULAR-DYNAMIC -- CRYSTALLIZATION -- SODIUM -- Na -- SODIUM LIQUID -- SODIUM SUPERCOOLED -- CRYSTAL NUCLEATION -- HOMOGENEOUS NUCLEATION -- SIMULATION -- RUBIDIUM -- Rb -- MODEL
Аннотация: Crystallization of supercooled liquid sodium containing a spheroidal bce nucleus was studied by molecular dynamics simulations. The degree of supercooling and the critical nucleus size are determined. After solidification, the system exhibits elasticity of shear. Nucleus growth is accompanied by self-sustained aperiodic temperature oscillations. The radial distribution function is computed and Voronoi polyhedra are constructed for the system immediately before and after the transition. It is shown by the projection method that the crystallized system contains structural defects and Features a long-range order

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