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Slavkin V.V.,Russian University of Cooperation | Tishchenko E.A.,Russian Academy of Sciences
Low Temperature Physics | Year: 2014

In-phase and quadrature components of the first harmonic response of polycrystalline YBa2Cu3O7-x, were measured in a dc magnetic field. For small field modulation amplitude of 0.005 Oe, in-phase component of the first harmonic response of a sample was found to be proportional to the differential magnetic susceptibility. It was found that there is no pinning of Josephson vortices in a weakly coupled medium in magnetic fields below Hc2J, where Hc2J is the upper critical field of Josephson weak links. The obtained initial magnetization curve allowed us to describe the nonlinear part of the magnetization arising due to the weak bonds in ceramics. The size of a Josephson vortex and the critical parameters Hp, Hc2J and Hc1g were evaluated. © 2014 AIP Publishing LLC. Source


Ol'shanskaya L.N.,Saratov State Technical University | Lazareva E.N.,Saratov State Technical University | Bulkina L.A.,Russian University of Cooperation
Chemical and Petroleum Engineering | Year: 2016

Extraction of nickel, iron, and zinc hydroxides and metallic nickel from galvanic sludges of Saratov Region industries is reported. It was established that the products could be used to produce pigments and fillers for paints and to fabricate rechargeable cathodes of chemical current sources (Ni–Cd and Ni–Fe batteries). © 2016 Springer Science+Business Media New York Source


Slavkin V.V.,Russian University of Cooperation | Tishchenko E.A.,Russian Academy of Sciences
Technical Physics | Year: 2012

A setup for measuring cophasal and quadrature components of higher harmonics of an electromotive-force signal of the response of a high-temperature superconductor makes it possible to study nonlinear magnetic properties of superconductors in variable magnetic fields of up to 1 kOe and constant magnetic fields of up to 10 T in the temperature range of 5-300 K. This setup was used to measure the temperature dependences of the absolute values of the real and imaginary parts of the first and third harmonics of the magnetization of textured Yba 2Cu 3O 7 - x polycrystalline samples in the temperature range of 77-220 K at various values of variable and constant magnetic fields. An analysis of resulting data made it possible to reveal the presence of different dynamical modes of the magnetic flux in YBa 2Cu 3O 7 - x that were dominant in different temperature ranges. The nonlinearity of the magnetization of YBa 2Cu 3O 7 - x (the appearance of higher harmonics) was observed up to temperatures in the range of T = 103-112 K, which were substantially higher than the temperature of the transition of this compound to a superconducting state. The observed feature in the magnetization of YBa 2Cu 3O 7 - x was associated with the emergence of a pseudogap state in this compound. © 2012 Pleiades Publishing, Ltd. Source


Fedorov E.G.,Russian University of Cooperation | Zhukov A.V.,Wilfrid Laurier University | Zhukov A.V.,Entropique Scientific Research Inc. | Belonenko M.B.,Entropique Scientific Research Inc. | And 2 more authors.
European Physical Journal D | Year: 2012

We study the propagation of two-dimensional bipolar electromagnetic pulses in an array of semiconducting carbon nanotubes. The electromagnetic field in such an array is described by Maxwell's equations, reduced to a nonlinear wave equation. The initial field distribution is given in the form of the breather sine-Gordon equation, restricted by a Gaussian profile in a plane perpendicular to the direction of the momentum. The numerical solution of the wave equation shows the possibility of propagation of the electromagnetic breather in an array of nanotubes. We reveal the nature of the evolution of the breather's shape and obtain the time dependence of its amplitude. We find that the breather, propagating in an array of nanotubes, is resistant to spreading and can travel a distance ̃10-3 / 10 -2 cm. © EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2012. Source


Fedorov E.G.,Russian University of Cooperation | Yanyushkina N.N.,Volgograd State University | Belonenko M.B.,Entropique Inc.
Technical Physics | Year: 2013

We consider the response of a quasi-one-dimensional ballistic carbon ring to the field of an electromagnetic wave propagating along the normal to the ring plane in the presence of a constant electric field collinear to the field of the wave. The dipole moment and the radiation intensity of the ring are calculated for the ballistic motion of a conduction electron. The possibility of implementation of regular periodic and chaotic regimes of ring emission under the action of external fields is demonstrated. The radiation spectrum of the ring is analyzed, and the dependence of the scattering cross section for an electromagnetic wave incident on the ring on its frequency and amplitude is calculated. © 2013 Pleiades Publishing, Ltd. Source

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