T 44 The effect of an Alternating Magnetic-Field on the Stability of Hard Levitation of High-Temperature Superconductors [Text] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov, E. V. Postrekhin, L. M. Shou, I. B. Smolyak, S. V. Naumov> // Materials Science and Engineering B. Solid State Materials for Advanced Technology. - 1998. - V. 53, Iss. 1-2. - P177-181 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОЛЕ МАГНИТНОЕ -- ПОЛЕ ПЕРЕМЕННОЕ -- ЛЕВИТАЦИЯ ТЯЖЕЛАЯ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ |
T 44 The Instability of Levitation of High-Temperature Superconductors Subject to an Alternating Magnetic-Field [Text] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov, I. B. Smolyak, S. V. Naumov> // Physica A. - 1998. - V. 302, Iss. 1. - P23-30 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОЛЕ МАГНИТНОЕ -- МАГНИТНОЕ ПОЛЕ -- ПОЛЕ ПЕРЕМЕННОЕ -- ПЕРЕМЕННОЕ ПОЛЕ -- ЛЕВИТАЦИЯ -- НЕУСТОЙЧИВОСТЬ ЛЕВИТАЦИИ -- ЛЕВИТАЦИИ НЕУСТОЙЧИВОСТЬ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ СВЕРХПРОВОДНИКИ |
S 68 Smolyak, B. M. Influence of a variable magnetic field on the stability of the magnetic suspension of high-T-c superconductors [] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov> // Technical Physics. - 1997. - V.42, Is.12. - С. 1455-1456 Рубрики: ФИЗИКА Кл.слова (ненормированные): FIELD VARIABLE -- FIELD MAGNETIC -- SUSPENSION MAGNETIC -- SUPERCONDUCTORS HIGH-T-C -- LEVITATION -- COLLAPSE -- AMPLITUDE CRITICAL -- FREQUENCY Аннотация: The resonant oscillation of superconductors by a variable magnetic held during hard levitation and the collapse of levitation are investigated. The critical amplitude and the frequency of the variable held are calculated \\\\Expert2\\NBO\\Technical Physics\\1997, v.42, N 12, p.1455.pdf |
S 68 Smolyak, B. M. Effects of relaxation in levitating superconductors / B. M. Smolyak, G. N. Perelshtein, G. V. Ermakov (Yermakov)> // Cryogenics. - 2002. - Vol.42, №10. - С. 635-644 Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
S 66 Skripov, V. P. Solid-liquid-vapor phase transitions: similaritie and differences / V. P. Skripov, M. Z. Faizullin> // Nucleation Theory and Applications. - Berlin : Wiley-VCH Verlag, 2004. - С. 122-167 Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATIONS -- POINT CRITICAL -- MAGNETIC LEVITATION |
S 68 Smolyak, B. M. The effect of ac magnetic fields on the lifting power of levitating superconductors / B. M. Smolyak, G. V. Ermakov, L. I. Chubraeva> // Superconductor Science and Technology. - 2007. - Vol.20, №4. - С. 406-411 Рубрики: ФИЗИКА Кл.слова (ненормированные): LEVITATION FORCE -- SUPERCONDUCTING SUSPENSION -- LIFTING FORCE Аннотация: This study deals with the decrease in the levitation force under the action of an ac field up to the frequency at which oscillations of the superconducting suspension are limited by inertia. The lifting force was measured as a function of the ac field amplitude and the exposure time. It was shown that the force quickly decreased at the moment the ac field was applied and then continued diminishing, but at a lower rate. A qualitative model was proposed, taking into account two effects of the ac field on the magnetization of the levitating superconductor: a complete destruction of the critical state in some section of the superconductor (to a depth λac) and the initiation of a faster magnetic relaxation in the region where the induction gradient is preserved |
S 86 Stopping of levitation force relaxation in superconductors: the flux-locking effect / B. M. Smolyak, G. N. Perelshtein, G. V. Ermakov, E. V. Postrekhin> // Physica C. - 2000. - Vol.341-348, Pt.2. - С. 1129-1130 Рубрики: ФИЗИКА Кл.слова (ненормированные): SUPERCONDUCTORS -- FLUX-LOCKING EFFECT -- RELAXATION Аннотация: Stopping of levitation force relaxation in superconductors under conditions of flux creep was studied experimentally. This effect appears when the flux profile is modulated in the near-surface layer of a superconductor. It was assumed that levitation was stabilized thanks to locking of the magnetic flux and internal magnetic relaxation. During this relaxation, the flux was redistributed in a sample, but the full flux and the average magnetization of the sample remained unchanged. A parameter characterizing the modulation depth was introduced. This parameter allows calculating the time during which the levitation force is constant |
S 68 Smolyak, B. M. On the force relaxation in the magnetic levitation system with a high-tc superconductor [Electronic resource] / B. M. Smolyak, M. S. Zakharov> // Superconductor Science and Technology. - 2014. - Vol. 27, № 5. - С. 055018 (1-5). - Bibliogr. : p. 055018-5 (17 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): LEVITATION -- MAGNETIC RELAXATION -- BULK HIGHTEMPERATURE Аннотация: The effect of magnetic flux creep on the lift force in a magnet/superconductor system was studied. It was shown experimentally that in the case of real levitation (when a levitating object bears only on a magnetic field) the suspension height and consequently the lift force did not change over a long period of time. When the levitating object is fixed for some time (i.e. a rigid constraint is imposed on it), the levitation height decreases after removal of the external constraint. It is assumed that free oscillations of the levitating object slow down the flux creep process, which is activated when these oscillations are suppressed \\\\expert2\\NBO\\Superconductor Science and Technology\\2014. V. 27, N 5. P. 055018.pdf |
T 44 The effect of an Alternating Magnetic-Field on the Stability of Hard Levitation of High-Temperature Superconductors [Text] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov, E. V. Postrekhin, L. M. Shou, I. B. Smolyak, S. V. Naumov> // Materials Science and Engineering B. Solid State Materials for Advanced Technology. - 1998. - V. 53, Iss. 1-2. - P177-181 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОЛЕ МАГНИТНОЕ -- ПОЛЕ ПЕРЕМЕННОЕ -- ЛЕВИТАЦИЯ ТЯЖЕЛАЯ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ |
T 44 The Instability of Levitation of High-Temperature Superconductors Subject to an Alternating Magnetic-Field [Text] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov, I. B. Smolyak, S. V. Naumov> // Physica A. - 1998. - V. 302, Iss. 1. - P23-30 Рубрики: ФИЗИКА Кл.слова (ненормированные): ПОЛЕ МАГНИТНОЕ -- МАГНИТНОЕ ПОЛЕ -- ПОЛЕ ПЕРЕМЕННОЕ -- ПЕРЕМЕННОЕ ПОЛЕ -- ЛЕВИТАЦИЯ -- НЕУСТОЙЧИВОСТЬ ЛЕВИТАЦИИ -- ЛЕВИТАЦИИ НЕУСТОЙЧИВОСТЬ -- СВЕРХПРОВОДНИКИ ВЫСОКОТЕМПЕРАТУРНЫЕ -- ВЫСОКОТЕМПЕРАТУРНЫЕ СВЕРХПРОВОДНИКИ |
S 68 Smolyak, B. M. Influence of a variable magnetic field on the stability of the magnetic suspension of high-T-c superconductors [] / B. M. Smolyak, M. V. Babanov, G. V. Ermakov> // Technical Physics. - 1997. - V.42, Is.12. - С. 1455-1456 Рубрики: ФИЗИКА Кл.слова (ненормированные): FIELD VARIABLE -- FIELD MAGNETIC -- SUSPENSION MAGNETIC -- SUPERCONDUCTORS HIGH-T-C -- LEVITATION -- COLLAPSE -- AMPLITUDE CRITICAL -- FREQUENCY Аннотация: The resonant oscillation of superconductors by a variable magnetic held during hard levitation and the collapse of levitation are investigated. The critical amplitude and the frequency of the variable held are calculated \\\\Expert2\\NBO\\Technical Physics\\1997, v.42, N 12, p.1455.pdf |
S 68 Smolyak, B. M. Effects of relaxation in levitating superconductors / B. M. Smolyak, G. N. Perelshtein, G. V. Ermakov (Yermakov)> // Cryogenics. - 2002. - Vol.42, №10. - С. 635-644 Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
S 66 Skripov, V. P. Solid-liquid-vapor phase transitions: similaritie and differences / V. P. Skripov, M. Z. Faizullin> // Nucleation Theory and Applications. - Berlin : Wiley-VCH Verlag, 2004. - С. 122-167 Рубрики: ФИЗИКА Кл.слова (ненормированные): NUCLEATIONS -- POINT CRITICAL -- MAGNETIC LEVITATION |
S 68 Smolyak, B. M. The effect of ac magnetic fields on the lifting power of levitating superconductors / B. M. Smolyak, G. V. Ermakov, L. I. Chubraeva> // Superconductor Science and Technology. - 2007. - Vol.20, №4. - С. 406-411 Рубрики: ФИЗИКА Кл.слова (ненормированные): LEVITATION FORCE -- SUPERCONDUCTING SUSPENSION -- LIFTING FORCE Аннотация: This study deals with the decrease in the levitation force under the action of an ac field up to the frequency at which oscillations of the superconducting suspension are limited by inertia. The lifting force was measured as a function of the ac field amplitude and the exposure time. It was shown that the force quickly decreased at the moment the ac field was applied and then continued diminishing, but at a lower rate. A qualitative model was proposed, taking into account two effects of the ac field on the magnetization of the levitating superconductor: a complete destruction of the critical state in some section of the superconductor (to a depth λac) and the initiation of a faster magnetic relaxation in the region where the induction gradient is preserved |
S 86 Stopping of levitation force relaxation in superconductors: the flux-locking effect / B. M. Smolyak, G. N. Perelshtein, G. V. Ermakov, E. V. Postrekhin> // Physica C. - 2000. - Vol.341-348, Pt.2. - С. 1129-1130 Рубрики: ФИЗИКА Кл.слова (ненормированные): SUPERCONDUCTORS -- FLUX-LOCKING EFFECT -- RELAXATION Аннотация: Stopping of levitation force relaxation in superconductors under conditions of flux creep was studied experimentally. This effect appears when the flux profile is modulated in the near-surface layer of a superconductor. It was assumed that levitation was stabilized thanks to locking of the magnetic flux and internal magnetic relaxation. During this relaxation, the flux was redistributed in a sample, but the full flux and the average magnetization of the sample remained unchanged. A parameter characterizing the modulation depth was introduced. This parameter allows calculating the time during which the levitation force is constant |
S 68 Smolyak, B. M. On the force relaxation in the magnetic levitation system with a high-tc superconductor [Electronic resource] / B. M. Smolyak, M. S. Zakharov> // Superconductor Science and Technology. - 2014. - Vol. 27, № 5. - С. 055018 (1-5). - Bibliogr. : p. 055018-5 (17 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): LEVITATION -- MAGNETIC RELAXATION -- BULK HIGHTEMPERATURE Аннотация: The effect of magnetic flux creep on the lift force in a magnet/superconductor system was studied. It was shown experimentally that in the case of real levitation (when a levitating object bears only on a magnetic field) the suspension height and consequently the lift force did not change over a long period of time. When the levitating object is fixed for some time (i.e. a rigid constraint is imposed on it), the levitation height decreases after removal of the external constraint. It is assumed that free oscillations of the levitating object slow down the flux creep process, which is activated when these oscillations are suppressed \\\\expert2\\NBO\\Superconductor Science and Technology\\2014. V. 27, N 5. P. 055018.pdf |