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Общее количество найденных документов : 38
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1.

Вид документа : Статья из журнала
Шифр издания : 53/G 15
Автор(ы) : Galashev A. E., Izmodenov I. A.
Заглавие : Computer investigation of the structure of Si73 clusters surrounded by hydrogen
Место публикации : Glass Physics and Chemistry. - 2008. - Vol. 34, № 2. - С. 173-181
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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2.

Вид документа : Статья из журнала
Шифр издания : 53/G 15
Автор(ы) : Galashev A. E., Izmodenov I. A.
Заглавие : Computer investigation of the structure of Si73 clusters surrounded by hydrogen
Место публикации : Glass Physics and Chemistry. - 2008. - Vol. 34, № 2. - С. 173-181
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 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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3.

Вид документа : Статья из журнала
Шифр издания : 53/C 74
Автор(ы) : Galashev A. E., Polukhin V. A., Izmodenov I. A., Galasheva O. A.
Заглавие : Computer Study of Glass-Like and Amorphous Silicon Nanoparticles
Место публикации : Поверхность. - 2006. - N 1. - С. 41-49: il., tabl. - ISSN 0207-3528. - ISSN 0207-3528
Примечания : Bibliogr.: p. 48-49 (26 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): glass-like and amorphous--silicon nanoparticles--voronoi polyhedra construction
Аннотация: Structural properties of vitreous and amorphous silicon nanoparticles containing 300, 400 and 500 atoms were investigated by the molecular dynamics method. The calculated nanoparticles radial distribution Functions and angular distributions of adjoining atoms were compared with the appropriate bulk Si-glass functions. The structure of the central part of silicon nanoparticles was investigatied in detail with the assistance of Voronoi polyhedra construction. The prevalence of five and six fold rings in Si-glasses nanoparticles and the domination of pentagons in amorphous silicon particles were revealed. The lengths of the Si-Si bonds and the number of bonds per atom were determined for nanoparticles under investigated conditions
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4.

Вид документа : Статья из журнала
Шифр издания : 53/C 74
Автор(ы) : Galashev A. E., Polukhin V. A., Izmodenov I. A., Galasheva O. A.
Заглавие : Computer Study of Glass-Like and Amorphous Silicon Nanoparticles
Место публикации : Поверхность. - 2006. - N 1. - С. 41-49: il., tabl. - ISSN 0207-3528. - ISSN 0207-3528
Примечания : Bibliogr.: p. 48-49 (26 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): glass-like and amorphous--silicon nanoparticles--voronoi polyhedra construction
Аннотация: Structural properties of vitreous and amorphous silicon nanoparticles containing 300, 400 and 500 atoms were investigated by the molecular dynamics method. The calculated nanoparticles radial distribution Functions and angular distributions of adjoining atoms were compared with the appropriate bulk Si-glass functions. The structure of the central part of silicon nanoparticles was investigatied in detail with the assistance of Voronoi polyhedra construction. The prevalence of five and six fold rings in Si-glasses nanoparticles and the domination of pentagons in amorphous silicon particles were revealed. The lengths of the Si-Si bonds and the number of bonds per atom were determined for nanoparticles under investigated conditions
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5.

Вид документа : Статья из журнала
Шифр издания : 53/D 63
Автор(ы) : Ermakov G.V., Lebedev G.D., Seskutov Y.V., Vladimirov P.F.
Заглавие : Distribution of Glass in the Bodies of Thermos Flasks
Место публикации : Glass and Ceramics. - 1979. - V.36, Is.5. - С. 250-253
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): glass--bodies of flasks--flasks thermos
\\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Glass and Ceramics\\1979, v. 36, N. 5, p.250.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 53/D 63
Автор(ы) : Ermakov G.V., Lebedev G.D., Seskutov Y.V., Vladimirov P.F.
Заглавие : Distribution of Glass in the Bodies of Thermos Flasks
Место публикации : Glass and Ceramics. - 1979. - V.36, Is.5. - С. 250-253
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): glass--bodies of flasks--flasks thermos
\\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Glass and Ceramics\\1979, v. 36, N. 5, p.250.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 53/E 97
Автор(ы) : Lipnyagov E. V., Perminov S. A., Ermakov G. V., Smolyak B. M.
Заглавие : Experimental determination of superheated liquids boiling-up expectancy time probabilities distribution
Место публикации : Thermophysics and Aeromtchanics. - 2009. - Vol.16, №4. - С. 627-633
Примечания : Bibliogr. : p. 633 (16 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): liquid--n-pentane --boiling-up
Аннотация: Results of statistical measurement of n-pentane and n-hexane boiling-up expectancy time near the boundary of attainable superheating are presented. Experiments were carried out in glass capillaries with various volumes of superheated liquid. Several samples with the volume from 100 to 200 measurements of life time for preset metastable state have been obtained (p, T = const). Their histograms contain small empty initial section, maximum and long “tail” in the area of large times. Non-monotonous dependence of probability distribution density on time proves non-stationary character of the random process resulting in the production of supercritical embryo. Two simple approximations of non-stationary nucleation flow well describing experimental data have been considered. For exponential distribution, the probabilities of experimentally found peculiarities of boiling-up expectancy time distribution density have been evaluated; they prove incompatibility of this distribution with the experimental one
\\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 4. P. 627-633.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 53/E 97
Автор(ы) : Lipnyagov E. V., Perminov S. A., Ermakov G. V., Smolyak B. M.
Заглавие : Experimental determination of superheated liquids boiling-up expectancy time probabilities distribution
Место публикации : Thermophysics and Aeromtchanics. - 2009. - Vol.16, №4. - С. 627-633
Примечания : Bibliogr. : p. 633 (16 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): liquid--n-pentane --boiling-up
Аннотация: Results of statistical measurement of n-pentane and n-hexane boiling-up expectancy time near the boundary of attainable superheating are presented. Experiments were carried out in glass capillaries with various volumes of superheated liquid. Several samples with the volume from 100 to 200 measurements of life time for preset metastable state have been obtained (p, T = const). Their histograms contain small empty initial section, maximum and long “tail” in the area of large times. Non-monotonous dependence of probability distribution density on time proves non-stationary character of the random process resulting in the production of supercritical embryo. Two simple approximations of non-stationary nucleation flow well describing experimental data have been considered. For exponential distribution, the probabilities of experimentally found peculiarities of boiling-up expectancy time distribution density have been evaluated; they prove incompatibility of this distribution with the experimental one
\\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 4. P. 627-633.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 53/E 97
Автор(ы) : Lipnyagov E. V., Perminov S. A., Ermakov G. V., Smolyak B. M.
Заглавие : Experimental testing of liquid boiling-up homogeneity near the boundary of the attainable superheating
Место публикации : Thermophysics and Aeromtchanics. - 2009. - Vol.16, №3. - С. 445-457
Примечания : Bibliogr. : p. 457 (20 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superheating--liquid--n-pentane
Аннотация: Results of measured average expectancy time of n-pentane and n-hexane boiling-up to the boundary of attainable superheating are presented. Experiments have been carried out in glass capillaries with substantially decreasing value of the superheated liquid volume for the preset metastable state (p, T = const). Obtained data fail to prove correlation 1 JVῑ = following from the condition of homogeneity and stationarity of the random process resulting in the superheated liquid boiling-up (J is the frequency of homogenous nucleation, V is the volume of the superheated liquid, ῑ is the average life time). Thus, experiments on superheated liquid boiling-up kinetics bound with measurements of average life time in glass capillaries cannot serve a proof of the validity of classical theory of nucleation for superheated liquids since one of the ground conditions — boiling-up homogeneity — is not met
\\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 3. P. 445-457.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 53/E 97
Автор(ы) : Lipnyagov E. V., Perminov S. A., Ermakov G. V., Smolyak B. M.
Заглавие : Experimental testing of liquid boiling-up homogeneity near the boundary of the attainable superheating
Место публикации : Thermophysics and Aeromtchanics. - 2009. - Vol.16, №3. - С. 445-457
Примечания : Bibliogr. : p. 457 (20 ref.)
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superheating--liquid--n-pentane
Аннотация: Results of measured average expectancy time of n-pentane and n-hexane boiling-up to the boundary of attainable superheating are presented. Experiments have been carried out in glass capillaries with substantially decreasing value of the superheated liquid volume for the preset metastable state (p, T = const). Obtained data fail to prove correlation 1 JVῑ = following from the condition of homogeneity and stationarity of the random process resulting in the superheated liquid boiling-up (J is the frequency of homogenous nucleation, V is the volume of the superheated liquid, ῑ is the average life time). Thus, experiments on superheated liquid boiling-up kinetics bound with measurements of average life time in glass capillaries cannot serve a proof of the validity of classical theory of nucleation for superheated liquids since one of the ground conditions — boiling-up homogeneity — is not met
\\\\expert2\\NBO\\Thermophysics and Aeromechanics\\2009, V. 16, N 3. P. 445-457.pdf
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