Saratov, Russia

Saratov State Technical University , located in Saratov, is one of the leading technical universities in Russia.СГТУ currently enrolls 26,466 students. Of these students, 15,115 are full-time, 1554 are evening, and 9723 are part-time. In 2005, the first year only enrolled 1,478 students. Currently the university employs 1,175 teachers, including 200 professors and doctors, and 590 assistant professors and Ph.D. candidates. More than 60 teachers are active members or corresponding members of different social academies of Russia. Wikipedia.

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Rodionov I.V.,Saratov State Technical University
Inorganic Materials: Applied Research | Year: 2013

The basic possibility is studied for producing biocompatible oxide coatings on periosteal osteofixation devices from stainless steel using the air-thermal oxidation method. The properties of the coatings are studied at different temperature modes of oxidation. Steel osteofixation devices with air-thermal oxide coatings are studied in vivo and show their high biocompatibility with thecoatings produced at oxidation temperatures of 400 and 500 C and exposure of 0.5 h. © 2013 Pleiades Publishing, Ltd.

Sysoev I.V.,Chernyshevsky Saratov State University | Sysoeva M.V.,Saratov State Technical University
Physica D: Nonlinear Phenomena | Year: 2015

The ability of the Granger causality method to detect directed coupling between subsystems of a complex system in a moving time window is investigated on etalon oscillators. In particular, the time series consisting of alternate stationary regimes characterised by the different amplitude and shape of oscillations with fast transient processes between these regimes are considered, with similar transitions being possible due to changes either in the coupling or in the individual properties of subsystems. Two popular approaches to surrogate times series generation are used to check the significance of the method results. Two model structures: the standard linear and the special non-linear adapted to data are implemented. The Granger causality method using the model structure adapted to data is shown to be significantly advantageous in detecting coupling directionality and the instant time of the regime change than the standard linear method, while in some cases the sensitivity and the specificity of the adapted approach are insufficient. © 2015 Elsevier B.V. All rights reserved.

Kuptsov P.V.,Saratov State Technical University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

Covariant Lyapunov vectors for scale-free networks of Hénon maps are highly localized. We revealed two mechanisms of the localization related to full and phase cluster synchronization of network nodes. In both cases the localization nodes remain unaltered in the course of the dynamics, i.e., the localization is nonwandering. Moreover, this is predictable: The localization nodes are found to have specific dynamical and topological properties and they can be found without computing of the covariant vectors. This is an example of explicit relations between the system topology, its phase-space dynamics, and the associated tangent-space dynamics of covariant Lyapunov vectors. © 2014 American Physical Society.

Kuptsov P.V.,Saratov State Technical University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2012

An effective numerical method for testing the hyperbolicity of chaotic dynamics is suggested. The method employs ideas of algorithms for covariant Lyapunov vectors but avoids their explicit computation. The outcome is a distribution of a characteristic value which is bounded within the unit interval and whose zero indicates a tangency between expanding and contracting subspaces. To perform the test one has to solve several copies of equations for infinitesimal perturbations whose number is equal to the sum of numbers of positive and zero Lyapunov exponents. Since this number is normally much less than the full phase space dimension, this method provides a fast and memory saving way for numerical hyperbolicity testing. © 2012 American Physical Society.

Kuptsov P.V.,Saratov State Technical University | Politi A.,CNR Institute for Complex Systems | Politi A.,University of Aberdeen
Physical Review Letters | Year: 2011

In this Letter, we show that the analysis of Lyapunov-exponent fluctuations contributes to deepen our understanding of high-dimensional chaos. This is achieved by introducing a Gaussian approximation for the large-deviation function that quantifies the fluctuation probability. More precisely, a diffusion matrix D (a dynamical invariant itself) is measured and analyzed in terms of its principal components. The application of this method to three (conservative, as well as dissipative) models allows (i) quantifying the strength of the effective interactions among the different degrees of freedom, (ii) unveiling microscopic constraints such as those associated to a symplectic structure, and (iii) checking the hyperbolicity of the dynamics. © 2011 American Physical Society.

Tseluikin V.N.,Saratov State Technical University
Colloid Journal | Year: 2016

Stable colloidal dispersions of fullerene С60 in water free of organic solvents have been obtained. The addition of a С60 solution to a water–acetone mixture has been shown to cause a solvatochromic effect. © 2016, Pleiades Publishing, Ltd.

Kurkin S.A.,Saratov State Technical University | Hramov A.E.,Saratov State Technical University | Koronovskii A.A.,Saratov State Technical University
Applied Physics Letters | Year: 2013

The study of the output power of the electromagnetic radiation of the relativistic electron beam (REB) with virtual cathode in the presence of external magnetic field has been found out. The typical dependencies of the output microwave power of the vircator versus external magnetic field have been analyzed by means of 3D electromagnetic simulation. It has been shown that the power of vircator demonstrates several maxima with external magnetic field growth. The characteristic features of the power behavior are determined by the conditions of the virtual cathode formation in the presence of the external transversal magnetic field and the REB self-magnetic fields. © 2013 AIP Publishing LLC.

Nefedov I.S.,Aalto University | Melnikov L.A.,Saratov State Technical University
Applied Physics Letters | Year: 2014

We demonstrate the production of strong directive thermal emissions in the far-field zone of asymmetric hyperbolic metamaterials (AHMs), exceeding that predicted by Planck's limit. Asymmetry is inherent to the uniaxial medium, where the optical axis is tilted with respect to medium interfaces. The use of AHMs is shown to enhance the free-space coupling efficiency of thermally radiated waves, resulting in Super-Planckian far-field thermal emission in certain directions. This effect is impossible in usual hyperbolic materials because emission of high density of states (DOS) photons into vacuum with smaller DOS is preserved by the total internal reflection. Different plasmonic metamaterials are proposed for realizing AHM media; the thermal emission from a AHM, based on a grapheme multilayer structure, is presented, as an example. © 2014 AIP Publishing LLC.

Tseluikin V.N.,Saratov State Technical University
Nanotechnologies in Russia | Year: 2014

Results of studies of composite coatings modified with nanoparticles are described. The focus is on metal coatings prepared by cathodic deposition from electrolyte suspensions. The effect of different nanoparticles (nanodiamonds, fullerenes, carbon nanotubes, carbides, oxides, etc.) on the performance properties (microhardness, wear resistance, corrosion stability, etc.) and structure of the composite coatings is examined. © 2014 Pleiades Publishing, Ltd.

Salmenniemi S.,University of Turku | Vorona M.,Saratov State Technical University
British Journal of Sociology | Year: 2014

Self-help has become a booming business over the past decades and an increasingly visible part of popular media culture worldwide. The paper analyzes the arrival and effects of this cultural technology in post-Soviet Russia after more than seventy years of socialism. It examines how Russians are engaging with popular psychology self-help as a technology of the self and how they are making it meaningful in their lives. Drawing on a set of one-to-one and focus group interviews conducted with self-help readers, it examines how these individuals negotiate the new ethics and the normative models of personhood put forward by the self-help genre. It argues that popular psychology has offered a new language for making sense of the self and the social world, and highlights how the readers critically engage with the normalizing power of popular psychology by drawing on a number of local historically sedimented discourses. © London School of Economics and Political Science 2014.

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