Персона:
Подливаев, Алексей Игоревич

Организационные подразделения

Организационная единица

Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Подливаев

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Алексей Игоревич

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Теперь показываю 1 - 10 из 23

Только метаданные
The influence of cyclical lateral displacements on levitation and guidance force for the system of coated conductor stacks and permanent magnets
(2019) Rudnev, Igor; Osipov, Maxim; Pokrovskii, Sergey; Podlivaev, Alexey; Руднев, Игорь Анатольевич; Осипов, Максим Андреевич; Покровский, Сергей Владимирович; Подливаев, Алексей Игоревич
For the development of levitation bearings and transportation systems based on coated conductor (CC) tapes it is important to know not only information on levitation force at vertical displacement, but also the data on stability of the system during lateral displacements of superconductor relative to permanent magnets. In this paper, we present new experimental results on investigation of both levitation and guidance forces of CC-tapes stacks subjected to cyclical lateral displacements relative to the position of permanent magnet. For the measurements we used 12 mm wide commercially available CC-tape manufactured by SuperOx. The long tape was cut into pieces 12 mm x 12 mm which then put to the stack. Total number of the single tape in the stack N was varied from 5 to 100. Under lateral displacement we measured the dependencies of levitation and guidance forces on value of displacement for various number of N and found that both levitation and guidance forces tend to decrease as a number of periodical cycles of displacements increase. The rate of reducing of forces was observed to depend on the number of tapes in the stack. We observed that dependencies of levitation and lateral forces on lateral displacements have a hysteresis. The area of hysteresis, which corresponds to the magnitude of energy losses, was found to decrease with increasing of number of elements in the stack. Experimental results are in a good agreement with the theoretical calculations of lateral force.
Только метаданные
Stone-Wales Bilayer Graphene: Structure, Stability, and Interlayer Heat Transfer
(2021) Podlivaev, A. I.; Grishakov, K. S.; Katin, K. P.; Maslov, M. M.; Подливаев, Алексей Игоревич; Гришаков, Константин Сергеевич; Катин, Константин Петрович; Маслов, Михаил Михайлович
The structure, stability, and interlayer heat transfer of Stone-Wales bilayer graphene have been studied within a nonorthogonal tight binding model. The most stable configuration has been identified among several metastable isomers differing in the mutual arrangement of the layers. It has been established that the structure under consideration is characterized by a stronger interlayer interaction than bilayer graphene, but its stiffness in the vertical direction is 17% smaller. The heat transfer between two layers of Stone-Wales graphene, one of which is initially cooled to 0 K and the second is heated to 77-7000 K, has been studied by the molecular dynamics method. The strain dependence of the interlayer heat transfer of the bilayer structure under study has been determined. It has been shown that the intensity of interlayer heat transfer strongly depends on the temperature and strain. Features of the interlayer interaction in Stone-Wales bilayer graphene that are atypical of usual bilayer graphene have been revealed and explained.
Только метаданные
Thermal Stability of Carbinofullerenes C38, C62, and C64
(2020) Podlivaev, A. I.; Подливаев, Алексей Игоревич
© 2020, Pleiades Publishing, Ltd.Abstract: The thermal stability of recently predicted carbinofullerenes C38, C62, and C64 was examined using the molecular dynamics method. Their decomposition channels and temperature dependences of the lifetime were characterized. The activation energies and frequency factors in the Arrhenius law were determined. New isomers of carbinofullerenes C38 and C62, which are more thermally stable than the initial carbinofullerenes, were found.
Только метаданные
Magnetic Braking and Energy Loss in Contactless Bearings Based on Superconducting Tapes
(2020) Podlivaev, A. I.; Rudnev, I. A.; Подливаев, Алексей Игоревич; Руднев, Игорь Анатольевич
© 2020, Pleiades Publishing, Ltd.Abstract: We consider magnetic braking and energy loss appearing in contactless bearings based on high-temperature superconducting tapes. We analyze model configurations of bearings in which a superconducting tape is the stator, while the rotor is a set of permanent magnets. It is shown that magnetic friction can be ignored in the case when the number of permanent magnets in the rotor is greater than eight. This result indicates the possibility of designing scaled magnetic bearings for long-term energy storage systems (e.g., kinetic storage rings).
Только метаданные
Magnetic Drag and Energy Losses in Noncontact Bearings Based on Superconducting Tapes
(2019) Podlivaev, A. I.; Rudnev, I. A.; Anishchenko, I. V.; Подливаев, Алексей Игоревич; Руднев, Игорь Анатольевич; Мартиросян, Ирина Валерьевна
© 2019, Pleiades Publishing, Ltd.In the paper, the problem of magnetic drag and origination of energy losses in noncontact bearings based on high-temperature superconducting tapes is considered. The model configurations of bearings in which a superconducting tape is a stator and a set of permanent magnets is a rotor are investigated. It is shown that the magnetic friction can be neglected in the case where more than eight permanent magnets compose the rotor. This result indicates the possibility to create scaled magnetic bearings for the systems of long-term energy storage, for example, flywheel energy storage systems.
Только метаданные
Thermal Stability of Hydrogen Clusters at Graphene and Stone—Wales Graphene Surfaces
(2020) Podlivaev, A. I.; Подливаев, Алексей Игоревич
© 2020, Pleiades Publishing, Inc.In the framework of the nonorthogonal tight-binding model, the possibility to form different thermally stable elements of the hydrogen pattern at graphene and Stone—Wales graphene surfaces is studied. The latter material is the recently predicted allotrope of graphene. The migration of a hydrogen atom adsorbed on these structures is numerically analyzed. The activation energies of migration of a hydrogen atom on the surfaces of graphene and Stone—Wales graphene are equal to 0.52 and 0.84 eV, respectively. The thermal stability of hydrogen clusters having the form of hexatomic rings and located on the surface of graphene, as well as the stability of the pent-, hex-, and heptatomic rings on the surface of Stone—Wales graphene, is estimated. The corresponding activation energies (1.61, 1.25, 1.36, and 1.27 eV, respectively), as well as the frequency-dependent factors in the Arrhenius formula characterizing the thermal decay, are determined. The lifetimes of these clusters at freezing and boiling temperatures of water are estimated.
Только метаданные
Hydrogen Desorption from Pentagraphane
(2019) Openov, L. A.; Podlivaev, A. I.; Подливаев, Алексей Игоревич
© 2019, Pleiades Publishing, Ltd.Abstract: Thermally activated hydrogen desorption from pentagraphane is studied by atomistic computer simulation. Pentagraphane is a recently predicted quasi-two-dimensional hydrocarbon compound that represents a pentagraphene single layer, in which both sides are covered with hydrogen and the C–C bonds form a network of adjacent pentagons, whereas the hexagons characteristic of carbon nanostructures are lacking. The effect of hydrogen desorption on the electronic structure, phonon density of states, and Young’s modulus are studied. The temperature dependence of the characteristic desorption time is determined by the molecular-dynamics method.
Только метаданные
C 20 Carbinofullerene Chains
(2019) Podlivaev, A. I.; Openov, L. A.; Подливаев, Алексей Игоревич
© 2019, Pleiades Publishing, Ltd. Abstract: The results of computer simulation of a new one-dimensional carbon structure representing chains composed of C 20 carbinofullerenes are presented. Their binding energies are determined. Their thermal stability is studied by the method of molecular dynamics. The resistance of chains to stretching is also studied. It is shown that breaking the bond between adjacent carbinofullerene moieties in the chain is a preferred channel for thermal and deformational destruction. The ultimate strains of chains and also the temperature dependence of their lifetime until the time of decay are determined. Using different approaches, the activation energy values and the frequency factors of the decay process in the Arrhenius law are found.
Только метаданные
On the Thermal Stability of Some Quasi-Fullerenes
(2019) Podlivaev, A. I.; Openov, L. A.; Подливаев, Алексей Игоревич
© 2019, Pleiades Publishing, Ltd. Abstract: The thermal stability of recently predicted quasi-fullerenes С 20 , С 42 , С 48 , and С 60 is studied by the method of molecular dynamics. The routes of their decomposition and the temperature dependences of their lifetimes are determined. The activation energy and frequency factor values that appear in the Arrhenius law are found. New isomers are detected.
Только метаданные
Magnetometry Diagnostics of Defects in High-Temperature Superconducting Tapes in a Gradient Magnetic Field
(2019) Podlivaev, A. I.; Pokrovskii, S. V.; Anishchenko, I. V.; Rudnev, I. A.; Подливаев, Алексей Игоревич; Покровский, Сергей Владимирович; Мартиросян, Ирина Валерьевна; Руднев, Игорь Анатольевич
© 2019, Pleiades Publishing, Ltd. Abstract: A new technique for contactless magnetometric determination of the local critical current in high-temperature superconducting tapes is proposed. In contrast to conventional approaches, where currents in a superconductor are induced by a uniform magnetic field of an external source, in our variant the tape is magnetized by a series of bipolar permanent magnets. It is shown that, for solving a number of technical problems of defect diagnostics, the proposed approach is more effective than those used earlier. Two variants of diagnostics are discussed. The first variant is intended for express diagnostics of local defects (first of all, transverse cracks) in a separate tape and in a tape stack and the second variant is developed for the case of a smooth critical current variation in a separate tape. The proposed method can significantly improve the accuracy of determining the local critical current density.