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Общее количество найденных документов : 86
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1.

Вид документа : Статья из журнала
Шифр издания : 53/K 79
Автор(ы) : Koverda V.P., Skokov V.N., Skripov V.P.
Заглавие : 1/f noise at a critical nonequilibrium phase transition
Место публикации : JETP Letters. - 1996. - V.63, Is.9. - С. 775-779
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f-noise
Аннотация: The generation of 1/f noise is demonstrated experimentally in a system consisting of a superconducting film carrying a transport current in contact with a boiling liquid coolant. It is found that wide-band 1/f noise with a large amplitude of the fluctuations is observed over a wide range of parameters. This noise is attributed to the fact that the sub-systems in contact have the same character of the relaxational dependences delta T(t)similar to t(-1/2)
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2.

Вид документа : Статья из журнала
Шифр издания : 53/K 79
Автор(ы) : Koverda V.P., Skokov V.N., Skripov V.P.
Заглавие : 1/f noise at a critical nonequilibrium phase transition
Место публикации : JETP Letters. - 1996. - V.63, Is.9. - С. 775-779
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f-noise
Аннотация: The generation of 1/f noise is demonstrated experimentally in a system consisting of a superconducting film carrying a transport current in contact with a boiling liquid coolant. It is found that wide-band 1/f noise with a large amplitude of the fluctuations is observed over a wide range of parameters. This noise is attributed to the fact that the sub-systems in contact have the same character of the relaxational dependences delta T(t)similar to t(-1/2)
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3.

Вид документа : Статья из журнала
Шифр издания : 53/B 93
Автор(ы) : Bulanov N.V., Khmylnin V.A.
Заглавие : A method of explosive effervescence of disperse-phase droplets for analysis of emulsions
Место публикации : Industrial Laboratory. - 1994. - V.60, Is.10. - С. 599-602
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): effervescence explosive--disperse-phase droplets--emulsions
Аннотация: A method and an experimental setup for dispersion analysis of emulsions based on overheating and explosive effervescence of disperse-phase droplets are described. Formulas are derived and a procedure for determining the fitting parameters for a description of the dispersive composition of an emulsion is given. The maximum count rate was about 500 droplets per second for droplet diameters ranging from 5 to 200 mu m. The method can be automated to handle high-viscosity, opaque, unstable, and heavily contaminated emulsions
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4.

Вид документа : Статья из журнала
Шифр издания : 53/B 93
Автор(ы) : Bulanov N.V., Khmylnin V.A.
Заглавие : A method of explosive effervescence of disperse-phase droplets for analysis of emulsions
Место публикации : Industrial Laboratory. - 1994. - V.60, Is.10. - С. 599-602
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): effervescence explosive--disperse-phase droplets--emulsions
Аннотация: A method and an experimental setup for dispersion analysis of emulsions based on overheating and explosive effervescence of disperse-phase droplets are described. Formulas are derived and a procedure for determining the fitting parameters for a description of the dispersive composition of an emulsion is given. The maximum count rate was about 500 droplets per second for droplet diameters ranging from 5 to 200 mu m. The method can be automated to handle high-viscosity, opaque, unstable, and heavily contaminated emulsions
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5.

Вид документа :
Шифр издания : 53/P 31
Автор(ы) : Pastukhov V. G., Maydanik Yu. F., Fershtater Y. G.
Заглавие : Adaptation of loop heat pipes to zero-g conditions
Место публикации : 6th European Symposium on Space Environmental Control Systems: Noordwijk, Netherlands, 20-22 may 1997 . - 1997. - Vol.400. - С. 385-391
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): loop heat pipes --heat-transport --thermocapillary phenomena
Аннотация: Loop heat pipes (LHPs) posses a great variety of valuable properties, which make them quite promising for application both on the Earth and in space. Among these are the LHP high heat-transport capacity at an any orientation in the field of mass forces, good mass-and-size parameters and the possibility of an arbitrary configuration of transport lines. At the same time such a drawback of LHPs of the conventional type as the instability of start up and operation in the region of low heat loads reduces their performance. The problem is connected, in a general case, with the unfavourable distribution of the vapor and the liquid phases of the working fluid in the evaporator. There is reason to believe that the LHP operation can also be significantly affected by zero-g conditions, in which the distribution of a working fluid is pre-determined only by the action of surface forces and the thermocapillary phenomena. The paper performs a general analysis of the necessary conditions imposed on the construction of LHP and some designs that contribute to the retention of serviceability in zero-g conditions at low heat loads. It gives the results of laboratory investigations of an adapted ammonia LHP with a heat-transfer capacity up to 2 kWxm
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6.

Вид документа :
Шифр издания : 53/P 31
Автор(ы) : Pastukhov V. G., Maydanik Yu. F., Fershtater Y. G.
Заглавие : Adaptation of loop heat pipes to zero-g conditions
Место публикации : 6th European Symposium on Space Environmental Control Systems: Noordwijk, Netherlands, 20-22 may 1997 . - 1997. - Vol.400. - С. 385-391
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): loop heat pipes --heat-transport --thermocapillary phenomena
Аннотация: Loop heat pipes (LHPs) posses a great variety of valuable properties, which make them quite promising for application both on the Earth and in space. Among these are the LHP high heat-transport capacity at an any orientation in the field of mass forces, good mass-and-size parameters and the possibility of an arbitrary configuration of transport lines. At the same time such a drawback of LHPs of the conventional type as the instability of start up and operation in the region of low heat loads reduces their performance. The problem is connected, in a general case, with the unfavourable distribution of the vapor and the liquid phases of the working fluid in the evaporator. There is reason to believe that the LHP operation can also be significantly affected by zero-g conditions, in which the distribution of a working fluid is pre-determined only by the action of surface forces and the thermocapillary phenomena. The paper performs a general analysis of the necessary conditions imposed on the construction of LHP and some designs that contribute to the retention of serviceability in zero-g conditions at low heat loads. It gives the results of laboratory investigations of an adapted ammonia LHP with a heat-transfer capacity up to 2 kWxm
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7.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kuvyrkin G. N.
Заглавие : An alternative method for the numerical solution of the integrodifferential heat-conduction equation
Место публикации : USSR Computational Mathematics and Mathematical Physics. - 1990. - Vol.30, №1. - С. 118-122
Примечания : Bibliogr. : p.
ББК : 53
Аннотация: An algorithm is developed using the finite-element method for calculating the temperature field in a bounded domain allowing for the finite rate of propagation of heat during pulsed surface heating. An accumulating finite element mesh is used in order to remove the oscillations in the solution behind the temperature wave front. An investigation of the error in the calculations enables a rational approach to be taken to the choice of parameters in the integration scheme. Calculations of the propagation and reflection of the temperature waves due to pulsed surface charging are presented
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8.

Вид документа : Статья из журнала
Шифр издания : 53/B 16
Автор(ы) : Baidakov V. G., Kuvyrkin G. N.
Заглавие : An alternative method for the numerical solution of the integrodifferential heat-conduction equation
Место публикации : USSR Computational Mathematics and Mathematical Physics. - 1990. - Vol.30, №1. - С. 118-122
Примечания : Bibliogr. : p.
ББК : 53
Аннотация: An algorithm is developed using the finite-element method for calculating the temperature field in a bounded domain allowing for the finite rate of propagation of heat during pulsed surface heating. An accumulating finite element mesh is used in order to remove the oscillations in the solution behind the temperature wave front. An investigation of the error in the calculations enables a rational approach to be taken to the choice of parameters in the integration scheme. Calculations of the propagation and reflection of the temperature waves due to pulsed surface charging are presented
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9.

Вид документа : Статья из журнала
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N.
Заглавие : An origin of 1/f fluctuations at a nonequilibrium phase transition
Место публикации : Physica A. - 1999. - V. 262, N 3-4. - С. 376-387
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f-noise--nonequilibrium phase transitions--high-temperature superconductor--boiling--stochastic equations--films
Аннотация: We present the results of experimental study of an intensive source of wide-band 1/f noise whose generation appears in a system of two interacting nonequilibrium phase transitions. Such a process has been realized in the region of superposition of a superconductor-normal conductor phase transition on a liquid-vapor crisis transition in a boiling cooler. A mathematical model describing phase transitions in a dynamical system with two interacting order parameters, converting "white" noise into two stationary stochastic processes with 1/f and 1/f(2) spectra has been suggested. The properties of model oscillations with 1/f spectrum are qualitatively adequate to those observed in experiment. The characteristic difference of model oscillations with a 1/f(2) spectrum from classic random walks has also been noted
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10.

Вид документа : Статья из журнала
Шифр издания : 53/K 79
Автор(ы) : Koverda V. P., Skokov V. N.
Заглавие : An origin of 1/f fluctuations at a nonequilibrium phase transition
Место публикации : Physica A. - 1999. - V. 262, N 3-4. - С. 376-387
ББК : 53
Предметные рубрики: ФИЗИКА
Ключевые слова (''Своб.индексиров.''): 1/f-noise--nonequilibrium phase transitions--high-temperature superconductor--boiling--stochastic equations--films
Аннотация: We present the results of experimental study of an intensive source of wide-band 1/f noise whose generation appears in a system of two interacting nonequilibrium phase transitions. Such a process has been realized in the region of superposition of a superconductor-normal conductor phase transition on a liquid-vapor crisis transition in a boiling cooler. A mathematical model describing phase transitions in a dynamical system with two interacting order parameters, converting "white" noise into two stationary stochastic processes with 1/f and 1/f(2) spectra has been suggested. The properties of model oscillations with 1/f spectrum are qualitatively adequate to those observed in experiment. The characteristic difference of model oscillations with a 1/f(2) spectrum from classic random walks has also been noted
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