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Общее количество найденных документов : 34
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1.

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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2.

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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3.

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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4.

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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5.

Вид документа : Статья из журнала
Шифр издания : 53/P 86
Автор(ы) : Postrekhin E.V., Smolyak B.M., Ermakov G.V.
Заглавие : Critical States in Hollow Cylinders from HTSC Ceramics during Shilding and Locking the Magnetic Flow
Место публикации : Fizika Nizkikh Temperatur. - 1991. - V.17, Is.11-12. - С. 1450-1453
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): state critical--cylinder hollow--htsc ceramics--flow magnetic
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6.

Вид документа : Статья из журнала
Шифр издания : 53/P 86
Автор(ы) : Postrekhin E.V., Smolyak B.M., Ermakov G.V.
Заглавие : Critical States in Hollow Cylinders from HTSC Ceramics during Shilding and Locking the Magnetic Flow
Место публикации : Fizika Nizkikh Temperatur. - 1991. - V.17, Is.11-12. - С. 1450-1453
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): state critical--cylinder hollow--htsc ceramics--flow magnetic
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7.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Perelshtein G. N., Ermakov (Yermakov) G. V.
Заглавие : Effects of relaxation in levitating superconductors
Место публикации : Cryogenics. - 2002. - Vol.42, №10. - С. 635-644
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superconductors--flux creep -- magnetic levitation
Аннотация: The effect of the magnetic flux creep on the levitation stability of high-temperature superconductors was studied. It was shown experimentally that under a unipolar magnetization the levitation force decreased at a logarithmic velocity characteristic of the creep process. If the current structure was bi- or multi-polar one, which was formed in a sample exposed to a reversing external magnetic field, the force remained unchanged during a certain period of time. The theory of relaxation of magnetization and force for a partial and full penetration of the critical state was considered. It was shown that relaxation decelerated sharply if the region with a current producing the main magnetization was far from the superconductor surface. A concept of an open and internal magnetic relaxation was introduced. The time of the internal relaxation for different reverse depths was estimated. The calculated values approached the experimental values of the levitation stabilization time
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8.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Perelshtein G. N., Ermakov (Yermakov) G. V.
Заглавие : Effects of relaxation in levitating superconductors
Место публикации : Cryogenics. - 2002. - Vol.42, №10. - С. 635-644
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): superconductors--flux creep -- magnetic levitation
Аннотация: The effect of the magnetic flux creep on the levitation stability of high-temperature superconductors was studied. It was shown experimentally that under a unipolar magnetization the levitation force decreased at a logarithmic velocity characteristic of the creep process. If the current structure was bi- or multi-polar one, which was formed in a sample exposed to a reversing external magnetic field, the force remained unchanged during a certain period of time. The theory of relaxation of magnetization and force for a partial and full penetration of the critical state was considered. It was shown that relaxation decelerated sharply if the region with a current producing the main magnetization was far from the superconductor surface. A concept of an open and internal magnetic relaxation was introduced. The time of the internal relaxation for different reverse depths was estimated. The calculated values approached the experimental values of the levitation stabilization time
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9.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V.
Заглавие : Elimination of magnetic relaxation in superconductors on approaching a ferromagnet
Место публикации : Physica C. - 2010. - Vol.470, №3. - С. 218-220
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): magnetic relaxation --ferromagnet--magnetic structure
Аннотация: It is found that magnetic relaxation is suppressed in a high-temperature superconductor when it approaches a ferromagnet. It is supposed that this phenomenon results from formation of a nonequilibrium magnetic structure, in which counter driving forces act in different regions
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10.

Вид документа :
Шифр издания : 53/S 68
Автор(ы) : Smolyak B. M., Ermakov G. V.
Заглавие : Elimination of magnetic relaxation in superconductors on approaching a ferromagnet
Место публикации : Physica C. - 2010. - Vol.470, №3. - С. 218-220
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): magnetic relaxation --ferromagnet--magnetic structure
Аннотация: It is found that magnetic relaxation is suppressed in a high-temperature superconductor when it approaches a ferromagnet. It is supposed that this phenomenon results from formation of a nonequilibrium magnetic structure, in which counter driving forces act in different regions
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