Velikiy Novgorod, Russia
Velikiy Novgorod, Russia

The Yaroslav-the-Wise Novgorod State University , also known informally as NovSU, was founded in 1993 by merging the two oldest higher education institutions of Veliky Novgorod: the Pedagogical and Polytechnic Institutes. Later, Novgorod Agricultural Academy was included into the structure of the University.At present it comprises seven Institutes and four Colleges of secondary vocational education. It is unusual that the Novgorod State University would have the name of Prince Yaroslav the Wise incorporated into its title. On the eve of the University’s first anniversary, the Prince’s personal seal was discovered during archaeological excavations. Academician Yanin considered it a remarkable coincidence and suggested awarding the University the name of the Russian prince. Wikipedia.

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Yeldesbay A.,University of Potsdam | Pikovsky A.,University of Potsdam | Pikovsky A.,Novgorod State University | Rosenblum M.,University of Potsdam
Physical Review Letters | Year: 2014

We demonstrate the emergence of a complex state in a homogeneous ensemble of globally coupled identical oscillators, reminiscent of chimera states in nonlocally coupled oscillator lattices. In this regime some part of the ensemble forms a regularly evolving cluster, while all other units irregularly oscillate and remain asynchronous. We argue that the chimera emerges because of effective bistability, which dynamically appears in the originally monostable system due to internal delayed feedback in individual units. Additionally, we present two examples of chimeras in bistable systems with frequency-dependent phase shift in the global coupling. © 2014 American Physical Society.

Komarov M.,University of Potsdam | Pikovsky A.,Novgorod State University
Physica D: Nonlinear Phenomena | Year: 2014

We study synchronization in a Kuramoto model of globally coupled phase oscillators with a bi-harmonic coupling function, in the thermodynamic limit of large populations. We develop a method for an analytic solution of self-consistent equations describing uniformly rotating complex order parameters, both for single-branch (one possible state of locked oscillators) and multi-branch (two possible values of locked phases) entrainment. We show that synchronous states coexist with the neutrally linearly stable asynchronous regime. The latter has a finite life time for finite ensembles, this time grows with the ensemble size as a power law. © 2014 Elsevier B.V. All rights reserved.

An expansion of the nearly free-electron model constructed by Frantzeskakis, Pons, and Grioni [1] describing quantum states at the Bi/Si(111) interface with the giant spin-orbit coupling is developed and applied for the band structure and spin polarization calculation, as well as for the linear response analysis of the charge current and induced spin caused by a dc field and by electromagnetic radiation. It is found that the large spin-orbit coupling in this system may allow resolving the spin-dependent properties even at room temperature and at a realistic collision rate. The geometry of the atomic lattice combined with spin-orbit coupling leads to an anisotropic response for both the current and spin components related to the orientation of the external field. The in-plane dc electric field produces only the in-plane components of spin in the sample, while both the in-plane and out-of-plane spin components can be excited by normally propagating electromagnetic wave with different polarizations. © Pleiades Publishing, Inc., 2012.

The results of studying the effect of grain-boundary diffusion acceleration during the annealing of submicrocrystalline (SMC) materials prepared by severe plastic deformation techniques are described. It is shown that the grain-boundary diffusion coefficient during recrystallization of SMC materials depends on the density of lattice dislocations and the pattern and rate of migration of the grain boundaries. It is found that, in SMC metals that undergo anomalous grain growth during annealing, the grain-boundary diffusion coefficient increases and its activation energy decreases. In SMC materials in which the recrystallization process exhibits conventional behavior, the diffusion properties of grain boundaries hardly differ from the equilibrium properties. Expressions describing the dependence of the grain-boundary diffusion coefficient on the migration rate of grain boundaries, as well as the thermodynamic and crystallographic parameters of the material, are derived. The calculation results are compared with the experimental data. © 2012 Pleiades Publishing, Ltd.

Klyuev A.V.,Novgorod State University
Journal of Communications Technology and Electronics | Year: 2013

The problem of finding the mean value and variance of the output process that occur in the course of noninertial detection of a random stationary process with the use of a δ-doped Schottky diode has been studied with the feedback taken into account. The dependences of the output parameters on the input parameters have been obtained within a Gaussian approximation. The effect of the inertia of the detecting system using the δ-doped Schottky diode on the simple statistical characteristics of the output process have been analyzed. © 2013 Pleiades Publishing, Ltd.

Edemskiy V.,Novgorod State University
Designs, Codes, and Cryptography | Year: 2011

We propose a computation method for linear complexity of series of generalized cyclotomic sequences with period p n+1. This method is based on using the polynomial of the classic cyclotomic sequences of period p. We found the linear complexity of generalized cyclotomic sequences corresponding to the classes of biquadratic residues and Hall sequences. © 2010 Springer Science+Business Media, LLC.

Klyuev A.V.,Novgorod State University
International Journal of Modern Physics B | Year: 2013

We present the results of cumulant analysis for detection of random process using a Schottky diode with δ-doping. The statistical characteristics of the output process of the detector, based on a Schottky diode with δ-doping, are investigated. We discuss noninertial and inertial detection mode. It was shown that at a relatively large dispersion of the input noise a noninertial detection mode occurs. © 2013 World Scientific Publishing Company.

Balandin A.V.,Novgorod State University
Letters in Mathematical Physics | Year: 2014

In this note, a new way to construct characteristics of conservation laws of integrable chiral-type systems is proposed. Some examples of such characteristics are considered. © 2014, Springer Science+Business Media Dordrecht.

Bochkov G.N.,Novgorod State University | Kuzovlev Yu.E.,Ukrainian Academy of Sciences
Physics-Uspekhi | Year: 2013

We discuss the 'generalized fluctuation-dissipation relations (theorems)' introduced for the first time in our work of 1977-1984 as statistical- thermodynamic consequences of time symmetry (reversibility) of microscopic dynamics. We show, in particular, that various similar relations, including 'fluctuation theorems' that have appeared since the 1990s, are, in essence, alternative formulations or special cases of our old results. © 2013 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

Pet'kov V.I.,Novgorod State University
Russian Chemical Reviews | Year: 2012

Data on the synthesis, structure and physicochemical characteristics of phosphates formed by MI and EIV cations, in particular, double and more complex phosphates in which MI has been partially replaced by H + or (M′)I and PO 4 3- has been partially replaced by TO 4 n- (T=Si, As, B, Mo) are generalized and described systematically. The key factors responsible for the formation of a particular type of structure are analyzed. The possibilities are considered for preparing structures of a desired type and symmetry and for fine tuning of properties of obtained crystals by varying the cationic and anionic components of the phosphate with retention of stable structural fragments of the crystal ensemble and by selecting an appropriate method of synthesis. The ways of practical application of complex phosphates taking into account their structural features are demonstrated. The bibliography includes 395 references. © 2012 Russian Academy of Sciences and Turpion Ltd.

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