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Общее количество найденных документов : 52
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1.

Вид документа : Статья из журнала
Шифр издания : 53/C 73
Автор(ы) : Gurashkin A. L, Starostin A.A., Ermakov G. V., Skripov P. V.
Заглавие : Communication: high speed optical investigations of a character of boiling-up onset
Место публикации : Journal of Chemical Physics. - 2012. - Vol.136, №2. - С. 021102
Примечания : Bibliogr. : p.
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling--heat trahsfer--micro-optics
Аннотация: In this communication, we discuss the phenomenon of attainable superheat of liquid and the peculiarities of its release by spontaneous boiling-up. We have combined the apparatus for superheating, namely, bubble chamber, with a high speed micro-optical method for detailed monitoring of the initial stage of boiling-up. In experiments on the isothermal pressure drop, it was found that the boiling-up onset of n-hexane is accompanied by characteristic step signal. The signal has proved to be typical of the heterogeneous character of boiling-up onset in a whole range of superheating degrees. The performance of the method for investigation of the refractive index and density for superheated liquids as functions of temperature and pressure has been revealed. The experimental error is estimated to be 0.1%.
\\\\expert2\\NBO\\Journal of Chemical Physics\\2012, V.136, p.021102.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 53/C 73
Автор(ы) : Gurashkin A. L, Starostin A.A., Ermakov G. V., Skripov P. V.
Заглавие : Communication: high speed optical investigations of a character of boiling-up onset
Место публикации : Journal of Chemical Physics. - 2012. - Vol.136, №2. - С. 021102
Примечания : Bibliogr. : p.
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling--heat trahsfer--micro-optics
Аннотация: In this communication, we discuss the phenomenon of attainable superheat of liquid and the peculiarities of its release by spontaneous boiling-up. We have combined the apparatus for superheating, namely, bubble chamber, with a high speed micro-optical method for detailed monitoring of the initial stage of boiling-up. In experiments on the isothermal pressure drop, it was found that the boiling-up onset of n-hexane is accompanied by characteristic step signal. The signal has proved to be typical of the heterogeneous character of boiling-up onset in a whole range of superheating degrees. The performance of the method for investigation of the refractive index and density for superheated liquids as functions of temperature and pressure has been revealed. The experimental error is estimated to be 0.1%.
\\\\expert2\\NBO\\Journal of Chemical Physics\\2012, V.136, p.021102.pdf
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3.

Вид документа :
Шифр издания : 53/E 70
Автор(ы) : Ermakov G. V., Gurashkin A. L
Заглавие : Description of heterogeneous boiling up of superheated liquid
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №4. - С. 231-235
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling--superheated n-hexane --heterogeneous boiling
Аннотация: The results of measurements of the average expectation time of boiling up of strongly superheated n-hexane in structures from different finely dispersed powders whose smallest size is about 10 nm by using isotherms and isobars are presented. As was proposed by Academician V.P. Skripov, isotherm sections with the heterogeneous boiling up mechanism were processed with the help of Zhurkov’s formula, which is based on the thermofluctuation hypothesis of solid body strength. Thus, temperature dependences of the characteristic volume, whose excess leads to the system division into macroscopic phases, have been found for the systems studied. An approach dealing with the boiling up of superheated liquid as a fluctuation in a locally isolated microvolume is used to describe the isobars. To calculate the work of formation of the characteristic volume, its values obtained at the processing of isotherms are used. The system of equations for the temperature dependence of the average expectation time of n-hexane boiling up in isobars has three empirical constants. A rather accurate description of isobars is obtained at a proper choice of these constants. The result obtained confirms that the idea of Academician V.P. Skripov is successful
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4.

Вид документа :
Шифр издания : 53/E 70
Автор(ы) : Ermakov G. V., Gurashkin A. L
Заглавие : Description of heterogeneous boiling up of superheated liquid
Место публикации : Journal of Engineering Thermophysics. - 2007. - Vol.16, №4. - С. 231-235
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): boiling--superheated n-hexane --heterogeneous boiling
Аннотация: The results of measurements of the average expectation time of boiling up of strongly superheated n-hexane in structures from different finely dispersed powders whose smallest size is about 10 nm by using isotherms and isobars are presented. As was proposed by Academician V.P. Skripov, isotherm sections with the heterogeneous boiling up mechanism were processed with the help of Zhurkov’s formula, which is based on the thermofluctuation hypothesis of solid body strength. Thus, temperature dependences of the characteristic volume, whose excess leads to the system division into macroscopic phases, have been found for the systems studied. An approach dealing with the boiling up of superheated liquid as a fluctuation in a locally isolated microvolume is used to describe the isobars. To calculate the work of formation of the characteristic volume, its values obtained at the processing of isotherms are used. The system of equations for the temperature dependence of the average expectation time of n-hexane boiling up in isobars has three empirical constants. A rather accurate description of isobars is obtained at a proper choice of these constants. The result obtained confirms that the idea of Academician V.P. Skripov is successful
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5.

Вид документа : Статья из журнала
Шифр издания : 53/Z 19
Автор(ы) : Zakharov M. S., Smolyak B. M., Ermakov G. V.
Заглавие : Effect of External Nonuniform Magnetic Field on Flux Creep Process in Superconductor
Место публикации : Journal of Superconductivity and Novel Magnetism. - 2012. - Article in Press. - С. 1-4
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical state--magnetic relaxation --superconductors
Аннотация: The effect of an external nonuniform magnetic field on the flux creep rate in a high-temperature superconductor with trapped magnetic flux was studied. The magnetic relaxation was suppressed when the superconductor was put into a field of permanent magnets or when it approached a ferromagnet. The effect arises when the field sources (being magnetized, the ferromagnet produces its own field) are placed near the superconductor surface, where the flux line ends are located. For these cases, we carried out the calculations of vortex and current density distributions, which demonstrate that reverse currents flow in the near-surface regions of the sample. This verifies the hypothesis suggested earlier about the influence of counter Lorentz forces retarding the creep of the vortices. In the interpretation of the results, we also take into consideration the magnetic force acting on the vortex ends in the external nonuniform magnetic field that allows us to explain the experimental results, in which the current structure in the sample is unipolar
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6.

Вид документа : Статья из журнала
Шифр издания : 53/Z 19
Автор(ы) : Zakharov M. S., Smolyak B. M., Ermakov G. V.
Заглавие : Effect of External Nonuniform Magnetic Field on Flux Creep Process in Superconductor
Место публикации : Journal of Superconductivity and Novel Magnetism. - 2012. - Article in Press. - С. 1-4
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): critical state--magnetic relaxation --superconductors
Аннотация: The effect of an external nonuniform magnetic field on the flux creep rate in a high-temperature superconductor with trapped magnetic flux was studied. The magnetic relaxation was suppressed when the superconductor was put into a field of permanent magnets or when it approached a ferromagnet. The effect arises when the field sources (being magnetized, the ferromagnet produces its own field) are placed near the superconductor surface, where the flux line ends are located. For these cases, we carried out the calculations of vortex and current density distributions, which demonstrate that reverse currents flow in the near-surface regions of the sample. This verifies the hypothesis suggested earlier about the influence of counter Lorentz forces retarding the creep of the vortices. In the interpretation of the results, we also take into consideration the magnetic force acting on the vortex ends in the external nonuniform magnetic field that allows us to explain the experimental results, in which the current structure in the sample is unipolar
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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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