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Труды сотрудников Института теплофизики УрО РАН
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 Найдено в других БД:Каталог книг и продолжающихся изданий (7)Труды Института высокотемпературной электрохимии УрО РАН (7)Труды сотрудников Института органического синтеза УрО РАН (1)Труды сотрудников Института химии твердого тела УрО РАН (13)Расплавы (1)Библиометрия (1)
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Общее количество найденных документов : 82
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 1-10    11-20   21-30   31-40   41-50   51-60      
1.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Coupled phase transitions under periodic perturbation [Electronic resource] / V. P. Koverda, V. N. Skokov // Doklady Physics. - 2014. - Vol. 59, № 7. - С. 291-294. - Bibliogr. : p. 294 (15 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
STOCHASTIC EQUATIONS -- STOCHASTIC PROCESSES
Аннотация: The influence of periodic perturbation on the system of two nonlinear stochastic equations, which model low-frequency pulsations in crisis and transient modes of heat-and-mass transfer with phase transitions, has been investigated by numerical methods. When studying the influence of the periodic perturbation on the system, a researcher should largely take into account the phase diagram. It is shown that nonequilibrium phase transitions from asymmetric cycles of phase trajectories to centrally symmetric ones occur in the absence of noise. These transitions are accompanied by the stochastic resonance response, which enhances as the frequency of the external periodic force decreases

\\\\expert2\\nbo\\Doklady Physics\\2014, v.59, N 7, p.291-294.pdf
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2.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Stochastic resonance and 1/f noise at coupled phase transitions [Electronic resource] / V. P. Koverda, V. N. Skokov // Physica A. - 2014. - Vol.391. - С. 173-181. - Bibliogr. : p. 181 (24 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
STOCHASTIC EQUATIONS -- STOCHASTIC RESONANCE
Аннотация: The system of two nonlinear stochastic equations simulating 1/f fluctuations during the interaction of nonequilibrium phase transitions in the presence of an external periodic action has been studied by numerical methods. It is shown that in the system there appears stochastic resonance, which leads to an amplification of the output periodic signal under the action of noise. To a random process with a 1/f power spectrum corresponds the maximum Gibbs-Shannon informational entropy. At stochastic resonance the informational entropy is minimum. A new behavior of a two-dimensional system at stochastic resonance has been revealed: at low frequencies of a periodic action with an increased white noise intensity the system trajectories are limited by two mutually perpendicular directions - anisotropic stochastic resonance. With a further increase in the white noise intensity in the system one can observe "ordinary" stochastic resonance, when the increasing intensity of fluctuations in the vicinity of the driving frequency is smeared in the directions

\\\\expert2\\nbo\\Physica A\\2014, v. 393, p.173-181.pdf
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3.
Инвентарный номер: нет.
   
   E 93

   
    Evaluation of metastable region boundaries for liquid and solid states in MD simulations [Electronic resource] / G. V. Ionov, V. V. Dremov, A. V. Karavaev, S. P. Protsenko, V. G. Baidakov, A. O. Tipeev // Journal of Physics : Condensed Matter. - 2014. - Vol.500, №17. - Article number 172004. - Bibliogr. : (6 ref)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DIFFUSION -- DYNAMIC LOADS -- LIQUIDS
Аннотация: An automatic method based on MD simulations was developed for detecting and tracing the boundaries of metastable states of superheated crystal and supercooled liquid. The main criterion of the detection of early nucleation of new phase is the self-diffusion coefficient temperature dependence. The scanning for nucleation events is performed at continuous temperature change. The set of independent nucleation events at a given pressure allows evaluation of temperature dependence of specific nucleation frequency. The collection of a large number of these calculations allows accurate approximation of pressure and temperature dependence of the specific nucleation frequency in both directions between phases. This dependence allows estimating the behavior of the free energy in the region between superheating and supercooling curves. In addition, dependence of nucleation frequency on pressure and temperature provides an opportunity to integrate the probability of nucleation under dynamic loading and subsequent release and thus to determine the likelihood of the crystallization and melting. The technique was applied to tin. MD simulation was carried out with the help of the EAM interatomic potential, well reproducing the properties of BCC phase.

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4.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Coupled phase transitions under periodic perturbation [Electronic resource] / V. P. Koverda, V. N. Skokov // Doklady Physics. - 2014. - Vol. 59, № 7. - С. 291-294. - Bibliogr. : p. 294 (15 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
STOCHASTIC EQUATIONS -- STOCHASTIC PROCESSES
Аннотация: The influence of periodic perturbation on the system of two nonlinear stochastic equations, which model low-frequency pulsations in crisis and transient modes of heat-and-mass transfer with phase transitions, has been investigated by numerical methods. When studying the influence of the periodic perturbation on the system, a researcher should largely take into account the phase diagram. It is shown that nonequilibrium phase transitions from asymmetric cycles of phase trajectories to centrally symmetric ones occur in the absence of noise. These transitions are accompanied by the stochastic resonance response, which enhances as the frequency of the external periodic force decreases

\\\\expert2\\nbo\\Doklady Physics\\2014, v.59, N 7, p.291-294.pdf
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5.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Stochastic resonance and 1/f noise at coupled phase transitions [Electronic resource] / V. P. Koverda, V. N. Skokov // Physica A. - 2014. - Vol.391. - С. 173-181. - Bibliogr. : p. 181 (24 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
STOCHASTIC EQUATIONS -- STOCHASTIC RESONANCE
Аннотация: The system of two nonlinear stochastic equations simulating 1/f fluctuations during the interaction of nonequilibrium phase transitions in the presence of an external periodic action has been studied by numerical methods. It is shown that in the system there appears stochastic resonance, which leads to an amplification of the output periodic signal under the action of noise. To a random process with a 1/f power spectrum corresponds the maximum Gibbs-Shannon informational entropy. At stochastic resonance the informational entropy is minimum. A new behavior of a two-dimensional system at stochastic resonance has been revealed: at low frequencies of a periodic action with an increased white noise intensity the system trajectories are limited by two mutually perpendicular directions - anisotropic stochastic resonance. With a further increase in the white noise intensity in the system one can observe "ordinary" stochastic resonance, when the increasing intensity of fluctuations in the vicinity of the driving frequency is smeared in the directions

\\\\expert2\\nbo\\Physica A\\2014, v. 393, p.173-181.pdf
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6.
Инвентарный номер: нет.
   
   E 93

   
    Evaluation of metastable region boundaries for liquid and solid states in MD simulations [Electronic resource] / G. V. Ionov, V. V. Dremov, A. V. Karavaev, S. P. Protsenko, V. G. Baidakov, A. O. Tipeev // Journal of Physics : Condensed Matter. - 2014. - Vol.500, №17. - Article number 172004. - Bibliogr. : (6 ref)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
DIFFUSION -- DYNAMIC LOADS -- LIQUIDS
Аннотация: An automatic method based on MD simulations was developed for detecting and tracing the boundaries of metastable states of superheated crystal and supercooled liquid. The main criterion of the detection of early nucleation of new phase is the self-diffusion coefficient temperature dependence. The scanning for nucleation events is performed at continuous temperature change. The set of independent nucleation events at a given pressure allows evaluation of temperature dependence of specific nucleation frequency. The collection of a large number of these calculations allows accurate approximation of pressure and temperature dependence of the specific nucleation frequency in both directions between phases. This dependence allows estimating the behavior of the free energy in the region between superheating and supercooling curves. In addition, dependence of nucleation frequency on pressure and temperature provides an opportunity to integrate the probability of nucleation under dynamic loading and subsequent release and thus to determine the likelihood of the crystallization and melting. The technique was applied to tin. MD simulation was carried out with the help of the EAM interatomic potential, well reproducing the properties of BCC phase.

Найти похожие
7.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Anisotropic stochastic resonance in the system with a 1/f spectrum [Electronic resource] / V. P. Koverda, V. N. Skokov // Doklady Physics. - 2013. - Vol.58, №10. - С. 433-437. - Bibliogr. : p. 437 (11 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
STOCHASTIC RESONANCE -- HARMONIC EXCITATION -- WHITE NOISE
Аннотация: A new behavior of two-dimensional system equations has been discovered upon stochastic resonance: at low frequencies of the harmonic excitation and increasing intensity of the white noise, the motion of the system is limited to two mutually perpendicular directions. In this case we obtain an anisotropic stochastic resonance. With further increase in the intensity of the white noise in the system, one can observe a normal stochastic resonance in which an increase in the intensity of fluctuations in the frequency range measured is blurred by directions

\\\\expert2\\nbo\\Doklady Physics\\2013, v.58, N 10, p.433-437.pdf
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8.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Stability of a random process with a 1/f spectrum under deterministic action [Электронный ресурс] / V. P. Koverda, V. N. Skokov // Technical Physics. - 2013. - Vol.58, №4. - P467-470
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
RANDOM PROCESS -- 1/F SPECTRUM -- LORENTZ SPECTRUM
Аннотация: The stability of the resultant process, which appears upon the interaction of a random process having a 1/f spectrum with a deterministic action, is analyzed using the entropy maximum principle. Under the action of a harmonic force, stable resultant processes are divided into two branches depending on the amplitude of the harmonic force. Due to an exponential relaxation upon an increase in the damping coefficient, the resultant process acquires the Lorentz spectrum without high-energy low-frequency spikes

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9.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Stability of low-frequency pulsations in a transient heat transfer regime upon phase transitions [Electronic resource] / V. P. Koverda, V. N. Skokov, A. V. Vinogradov // High Temperature. - 2013. - Vol.51, №3. - P421-425. - Bibliogr. : p. 425 (20 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HARMONIC FORCE -- LOW-FREQUENCY PULSATIONS -- HEAT-MASS TRANSFER
Аннотация: Using the principle of maximum entropy, we investigate the stability of stochastic processes with the 1/f power spectrum in the system of two nonlinear stochastic differential equations when modeling pulsations in crisis and transient heat-mass transfer regimes with intensive phase transitions. An analysis of the stability of the resultant process, which appears upon the interaction of the stochastic process and the 1/f spectrum of external deterministic impact, is performed. Under the action of harmonic force, stable resultant processes are divided into two types depending on the amplitude of the harmonic force. We have experimentally studied the influence of harmonic impact on the stability of pulsations with the 1/f spectrum upon the crisis of water boiling on a heated wire. The results are in qualitative agreement with theoretical estimations

\\\\expert2\\NBO\\High Temperature\\2013, v. 51, N 3, p.421-425.pdf
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10.
Инвентарный номер: нет.
   
   K 79

    Koverda, V. P.
    Stability of low-frequency pulsations in a transient heat transfer regime upon phase transitions [Electronic resource] / V. P. Koverda, V. N. Skokov, A. V. Vinogradov // High Temperature. - 2013. - Vol.51, №3. - P421-425. - Bibliogr. : p. 425 (20 ref.)
ББК 53
Рубрики: ФИЗИКА
Кл.слова (ненормированные):
HARMONIC FORCE -- LOW-FREQUENCY PULSATIONS -- HEAT-MASS TRANSFER
Аннотация: Using the principle of maximum entropy, we investigate the stability of stochastic processes with the 1/f power spectrum in the system of two nonlinear stochastic differential equations when modeling pulsations in crisis and transient heat-mass transfer regimes with intensive phase transitions. An analysis of the stability of the resultant process, which appears upon the interaction of the stochastic process and the 1/f spectrum of external deterministic impact, is performed. Under the action of harmonic force, stable resultant processes are divided into two types depending on the amplitude of the harmonic force. We have experimentally studied the influence of harmonic impact on the stability of pulsations with the 1/f spectrum upon the crisis of water boiling on a heated wire. The results are in qualitative agreement with theoretical estimations

\\\\expert2\\NBO\\High Temperature\\2013, v. 51, N 3, p.421-425.pdf
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