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 30

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
Competition of hydrogen desorption and migration on graphene surface in alternating electric field: Multiscale molecular dynamics and diffusion study
(2025) Podlivaev, A. I.; Katin, K. P.; Подливаев, Алексей Игоревич; Катин, Константин Петрович
Только метаданные
Interlayer Heat Conductivity and Thermal Stability of Distorted Bilayer Graphene
(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
© 2021, Pleiades Publishing, Inc.The nonorthogonal tight-binding potential is augmented by long-range terms needed for a correct description of the interlayer interaction in bilayer graphene. The molecular dynamics method is used to study the heat transfer between two distorted graphene layers, one of which is initially cooled down to 0 K, and the second one is heated up to 77−7000 K. The characteristic time of the heat transfer depending on the initial temperature of the heated layer and the distortion of the layers is determined. It is demonstrated that both factors significantly affect the intensity of interlayer heat transfer. It is found that, during the characteristic time of temperature equalization, thermally induced defects of various types, including melting, separation of the layers, and tangential shear of the heated layer, can appear in the system. It is shown that the formation of thermally induced defects can result in more than an order of magnitude increase in the rate of interlayer heat transfer.
Только метаданные
Scalable superconductive magnetic bearing based on non-closed CC tapes windings
(2021) Osipov, M.; Anishenko, I.; Starikovskii, A.; Abin, D.; Pokrovskii, S.; Podlivaev, A.; Rudnev, I.; Осипов, Максим Андреевич; Мартиросян, Ирина Валерьевна; Стариковский, Александр Сергеевич; Абин, Дмитрий Александрович; Покровский, Сергей Владимирович; Подливаев, Алексей Игоревич; Руднев, Игорь Анатольевич
A new type of scalable high-temperature superconducting magnetic bearing is proposed. The bearing is based on the multilayer open windings made of coated conductor-tapes (CC-tapes). To demonstrate the possibility of manufacturing such a bearing construction we have built a working prototype and studied its characteristics. The manufactured model of bearing includes a stator, consisting of three multilayer rings (CC-tapes pancake coils) of 12 mm CC-tape and a composite rotor consisting of three rings of permanent magnets, each composed of 16 NdFeB 10 x 10 mm permanent magnets. We showed a contactless levitation of rotor relative to stator, as well as rotation of rotor and we measured load curves, namely the dependence of the rotor displacement on restoring force for axial and radial loads. Numerical simulation of bearing load characteristics has been carried out by the finite element method in the Comsol Multiphysics software. The calculation results are in a good agreement with the experimental data.
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
On Magnetometric Determination of the Radiation Defect Concentration in a Superconducting GdBa2Cu3O7 –x Film
(2021) Podlivaev, A. I.; Rudnev, I. A.; Подливаев, Алексей Игоревич; Руднев, Игорь Анатольевич
© 2021, Pleiades Publishing, Ltd.Abstract: An express magnetometric technique which enables the determination of inhomogeneities of changing the superconducting properties of a thin semiconductor layer due to a radiation irradiation is proposed and justified. This technique is numerically simulated for a superconducting GdBa2Cu3O7 – x layer irradiated with hydrogen and helium ions. The concentration profile of radiation defects is calculated using the SRIM program package. The distribution of the density of superconducting currents induced by an external magnetic field is calculated in terms of the critical state model. The model calculations demonstrate the efficiency of the proposed technique.
Только метаданные
Disordering in Stone-Wales Graphene at High Temperatures
(2019) Openov, L. A.; Podlivaev, A. I.; Подливаев, Алексей Игоревич
Thermally activated structural disordering is numerically studied in Stone-Wales graphene, which is a recently predicted new allotropic modification of graphene. The elastic characteristics of this material are analyzed. The Young modulus (E= 857 GPa) and Poisson ratio (nu = 0.39) are determined. Defect formation processes under strong heating are studied by the real-time molecular dynamics method. It is demonstrated that melting begins with the formation of large windows in the monolayer and splitting of transversely oriented carbon chains from it. A criterion for the melting of two-dimensional systems is used to analyze the results. The upper estimate for the melting temperature is about 3800 K, which is much lower than the corresponding value for graphene.
Только метаданные
Radiation Formation of Interlayer Bridges in Bilayer Graphene
(2023) Podlivaev, A. I.; Подливаев, Алексей Игоревич
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
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).