S 68 Smolyak, B. M. ZFC-, FC- and Rem- susceptibility of granular superconductors [Text] / B. M. Smolyak, E. V. Postrekhin, G. V. Ermakov // Superconductor Science and Technology. - 1994. - V. 7. - P427-433 Рубрики: ФИЗИКА Кл.слова (ненормированные): ZFC-ЧУВСТВИТЕЛЬНОСТЬ -- FC-ЧУВСТВИТЕЛЬНОСТЬ -- Rem-ЧУВСТВИТЕЛЬНОСТЬ -- СВЕРХПРОВОДНИКИ ЗЕРНИСТЫЕ -- ЗЕРНИСТЫЕ СВЕРХПРОВОДНИКИ -- ТЕПЛОФИЗИКА |
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. The paramagnetic effect of clusters in granular superconductors under the Meissner magnetization [Text] / B. M. Smolyak, G. V. Ermakov // Journal of Magnetism and Magnetic Materials. - 1996. - Vol. 153, № 3. - P311-314 Рубрики: ФИЗИКА Кл.слова (ненормированные): ЭФФЕКТ ПАРАМАГНИТНЫЙ -- ПУЧКИ СВЕРХПРОВОДНИКОВ -- СВЕРХПРОВОДНИК ГРАНУЛИРОВАННЫЙ -- НАМАГНИЧЕННОСТЬ МЕЙСНЕРА |
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 |
P 86 Postrekhin, E. V. Critical States in Hollow Cylinders from HTSC Ceramics during Shilding and Locking the Magnetic Flow [] / E. V. Postrekhin, B. M. Smolyak, G. V. Ermakov // Fizika Nizkikh Temperatur. - 1991. - V.17, Is.11-12. - С. 1450-1453 Рубрики: ФИЗИКА Кл.слова (ненормированные): STATE CRITICAL -- CYLINDER HOLLOW -- HTSC CERAMICS -- FLOW MAGNETIC |
S 68 Smolyak, B. M. Retardation of the Magnetic Relaxation in High-Temperature Superconductors Near a Ferromagnet / B. M. Smolyak, G. V. Ermakov, M. S. Zakharov // Journal of Superconductivity and Novel Magnetism. - 2011. - Vol.24, №1-2. - С. 325-329 Рубрики: ФИЗИКА Кл.слова (ненормированные): HIGH-T C SUPERCONDUCTORS -- TRAPPED FLUX -- MAGNETIC RELAXATION Аннотация: The creep of a magnetic flux trapped in a bulk high-temperature superconductor has been studied. It has been found that the magnetic relaxation is retarded when the superconductor is placed near a ferromagnet. The value of the retardation effect depends on the sequence of magnetization and the approach of the superconductor to a ferromagnet. The magnetic relaxation is fully suppressed when a superconducting sample first is magnetized and then is brought close to a ferromagnet. An interpretation of this effect has been discussed. Being magnetized, a ferromagnet produces its own magnetic field. While penetrating into a disk sample through its planes, the ferromagnet field induces screening currents, which circulate oppositely to the current that arises upon trapping of the magnetic flux. As a result, the stability of the magnetic structure is sharply improved since opposite driving forces can act on different sections of the vortices |
S 68 Smolyak, B. M. Elimination of magnetic relaxation in superconductors on approaching a ferromagnet / B. M. Smolyak, G. V. Ermakov // Physica C. - 2010. - Vol.470, №3. - С. 218-220 Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
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 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. Suppression of magnetic relaxation in a high-temperature superconductor placed near a ferromagnet [Electronic resource] / B. M. Smolyak, G. V. Ermakov // Technical Physics Letters . - 2010. - Vol.36, №5. - P461-463. - Bibliogr. : p. 463 (12 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): MAGNETIC RELAXATION -- HIGH TEMPERATURE -- FERROMAGNET Аннотация: The phenomenon of the suppression of magnetic relaxation in a high temperature superconduc tor (HTSC) with trapped magnetic flux has been observed when the superconducting sample approached a ferromagnet. It is suggested that the ferromagnet is magnetized in the magnetic field of the sample and, in turn, induces currents in the superconductor, which circulate in a direction opposite to that of the trapped flux current. As a result, the magnetic structure becomes stable with respect to the magnetic flux creep because oppositely directed Lorentz forces can act upon different regions of vortices. \\\\expert2\\NBO\\Technical Physics Letters (Письма в ЖТФ)\\2010, v. 36, N. 5, p.461.pdf |
E 97 Experimental testing of liquid boiling-up homogeneity near the boundary of the attainable superheating [Electronic resource] / E. V. Lipnyagov, S. A. Perminov, G. V. Ermakov, B. M. Smolyak // Thermophysics and Aeromtchanics. - 2009. - Vol.16, №3. - P445-457. - Bibliogr. : p. 457 (20 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
E 97 Experimental determination of superheated liquids boiling-up expectancy time probabilities distribution [Electronic resource] / E. V. Lipnyagov, S. A. Perminov, G. V. Ermakov, B. M. Smolyak // Thermophysics and Aeromtchanics. - 2009. - Vol.16, №4. - P627-633. - Bibliogr. : p. 633 (16 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
Z 19 Zakharov, M. S. Effect of External Nonuniform Magnetic Field on Flux Creep Process in Superconductor [Electronic resource] / M. S. Zakharov, B. M. Smolyak, G. V. Ermakov // Journal of Superconductivity and Novel Magnetism. - 2012. - Article in Press. - P1-4 Рубрики: ФИЗИКА Кл.слова (ненормированные): 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 |
S 68 Smolyak, B. M. Slowing-down of the vortex motion in the flux creep process by counter forces exerted on the vortex ends [Electronic resource] / B. M. Smolyak, M. S. Zakharov // Superconductor Science and Technology. - 2012. - Vol.25, №12. - С. 125019. - Bibliogr. : p. 125019 (15 ref.) Рубрики: ФИЗИКА Кл.слова (ненормированные): BIPOLAR CURRENTS -- CRITICAL STATE -- FERROMAGNETS Аннотация: The effect of the suppression of flux creep in a high-temperature superconductor by counter forces exerted on the vortex ends was studied. These forces, acting in the opposite direction to the process of vortex diffusion, arise when the magnetized sample is put into a nonuniform magnetic field. The source of the field should be placed near the surface of the superconductor where the flux line ends are located. The critical states in a disk sample placed near a ferromagnet or permanent magnets were calculated. The results of the calculations verify the bipolar current structure and, therefore, the existence of counter Lorentz forces in the near-surface region. It was shown that in addition to the Lorentz force it is necessary to take into account the magnetic force acting on the vortex ends in the external nonuniform magnetic field. Depending on the direction of this force, the magnetic relaxation slows down or accelerates \\\\expert2\\NBO\\Superconductor Science and Technology\\2012. V. 25, N12. P. 125019.pdf |
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 |
S 68 Smolyak, B. M. ZFC-, FC- and Rem- susceptibility of granular superconductors [Text] / B. M. Smolyak, E. V. Postrekhin, G. V. Ermakov // Superconductor Science and Technology. - 1994. - V. 7. - P427-433 Рубрики: ФИЗИКА Кл.слова (ненормированные): ZFC-ЧУВСТВИТЕЛЬНОСТЬ -- FC-ЧУВСТВИТЕЛЬНОСТЬ -- Rem-ЧУВСТВИТЕЛЬНОСТЬ -- СВЕРХПРОВОДНИКИ ЗЕРНИСТЫЕ -- ЗЕРНИСТЫЕ СВЕРХПРОВОДНИКИ -- ТЕПЛОФИЗИКА |
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 |