Vadim Anishchenko
Astrakhanskaya 83, 410026, Saratov, Russia
Saratov State University, Russia
Department of Physics, Saratov State University
Head of Radiophysics and Nonlinear Dynamics Chair, Saratov State University, Russia
Born: October 21, 1943
1961-1966: student of Saratov State University, Russia.
1968-1970: Post-graduate (Ph.D.) student, Saratov State University, Russia
PROFESSIONAL BACKGROUND
1968-1970: Post-graduate student, State University, Saratov, Russia
1970-1987: Assistent, First teacher, Associate professor,State University, Saratov, Russia
1987-1987: Professor, Humboldt University, Berlin
1987-1988: Professor, State University, Saratov, Russia
Since 1988: Head of Radiophysics and Nonlinear Dynamics Chair, State University, Saratov, Russia
ACADEMIC DEGREES
1970: Ph.D., Saratov State University, Russia
1987: Doctor of Sciences, Saratov State University, Russia
1989: Professor of Radiophysics and Nonlinear Dynamics Chair, Saratov State University, Russia
1994: Scientific Grant of the President of Russia and Russian Academy of Sciences
1994: Soros Professor
1995: Honored Man of Science of Russia
1995: Corresponding Member of International Academy of Informatization (OON)
1997: Corresponding Member of Russian Academy of Natural Sciences
Publications:
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Bukh A. V., Anishchenko V. S.
Abstract
The features of external and mutual synchronization of spiral wave structures including
chimera states in the interacting two-dimensional lattices of nonlocally coupled Nekorkin maps
are investigated. The cases of diffusive and inertial couplings between the lattices are considered.
The lattices model a neuronal activity and represent two-dimensional lattices consisting
of $N \times N$ elements with $N = 200$. It is shown that the effect of complete synchronization is
not achieved in the studied lattices, and only the regime of partial synchronization is realized
regardless of the case of coupling between the lattices. It is important to note that the conclusion
is applied not only to the regimes of spiral wave chimeras, but also to the regimes of regular
spiral waves.
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Bukh A. V., Strelkova G. I., Anishchenko V. S.
Abstract
Effects of synchronization of chimera states are studied numerically in a two-layer network of nonlocally coupled nonlinear chaotic discrete-time systems. Each layer represents a ring of nonlocally coupled logistic maps in the chaotic mode. A control parameter mismatch is introduced to realize distinct spatiotemporal structures in isolated ensembles. We consider external synchronization of chimeras for unidirectional intercoupling and mutual synchronization in the case of bidirectional intercoupling. Synchronization is quantified by calculating the crosscorrelation coefficient between the symmetric elements of the interacting networks. The same
quantity is used to determine finite regions of synchronization inside which the cross-correlation coefficient is equal to 1. The identity of synchronous structures and the existence of finite synchronization regions are necessary and sufficient conditions for establishing the synchronization effect. It is also shown that our results are qualitatively similar to the synchronization of periodic
self-sustained oscillations.
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Semenova N. I., Anishchenko V. S.
Abstract
We consider the dynamics of a ring of nonlocally coupled logistic maps when varying the coupling coefficient. We introduce the coupling function, which characterizes the impact of nonlocal neighbors and study its dynamics together with the dynamics of the whole ensemble. Conditions for the transition from complete chaotic synchronization to partial one are analyzed and the corresponding theoretical estimation of the bifurcation parameter $\sigma$ is given. Conditions for the appearance of phase and amplitude chimera states are also studied.
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Boev Y. I., Strelkova G. I., Anishchenko V. S.
Abstract
The local theory of Poincaré recurrences is applied to estimate pointwise and information dimensions of chaotic attractors in two-dimensional nonhyperbolic and hyperbolic maps. It is shown that the local pointwise dimension can be defined by calculating the mean recurrence times depending on the return vicinity size. The values of pointwise, information, capacity, and Lyapunov dimensions are compared. It is also analyzed how the structure of attractors can affect the calculation of the dimensions.
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Semenova N. I., Anishchenko V. S.
Abstract
In the present work we analyze the statistics of a set that is obtained by calculating a stroboscopic section of phase trajectories in a harmonically driven van der Pol oscillator. It is shown that this set is similar to a linear shift on a circle with an irrational rotation number, which is defined as the
detuning between the external and natural frequencies. The dependence of minimal return times on the size ε of the return interval is studied experimentally for the golden ratio. Furthermore, it is also found that in this case, the value of the Afraimovich–Pesin dimension is $\alpha_c = 1$.
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Boev Y. I., Semenova N. I., Anishchenko V. S.
Abstract
The statistics of Poincaré recurrences is studied numerically in a one-dimensional cubic map in the presence of harmonic and noisy excitations. It is shown that the distribution density of Poincare recurrences is periodically modulated by the harmonic forcing. It is substantiated that the theory of the Afraimovich–Pesin dimension can be applied to a nonautonomous map for both harmonic and noisy forcings. It is demonstrated that the relationship between the AP-dimension and Lyapunov exponents is violated in the nonautonomous system.
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Feoktistov A. V., Anishchenko V. S.
Abstract
Phenomenon of coherence resonance and external synchronization of noise-induced stochastic oscillations in hard excitation oscillator are studied by means of natural experiments. Regions of synchronization on parameter plane are constructed. Experiments on synchronization in hard excitation oscillator without noise are carried out.
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Anishchenko V. S., Semenova N. I., Astakhov S. V., Boev Y. I.
Abstract
The concept of a local fractal dimension has been introduced in the framework of the average Poincaré recurrence time numerical analysis in an $\varepsilon$-vicinity of a certain point. Lozi and Hénon maps have been considered. It has been shown that in case of Lozi map the local dimension weakly depends on the point on the attractor and its value is close to the fractal dimension of the attractor. In case of a quasi attractor observed in both Hénon and Feugenbaum systems the local dimension significantly depends on both the diameter and the location of the $\varepsilon$-vicinity. The reason of this strong dependency is high non-homogenity of a quasi-attractor which is typical for non-hyperbolic chaotic attractors.
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Anishchenko V. S., Astakhov S. V., Boev Y. I., Kurths J.
Abstract
Statistical properties of Poincaré recurrences in a two-dimensional map with chaotic non-strange attractor have been studied in numerical simulations. A local and a global approaches were analyzed in the framework of the considered problem. It has been shown that the local approach corresponds to Kac’s theorem including the case of a noisy system in certain conditions which have been established. Numerical proof of theoretical results for a global approach as well as the Afraimovich–Pesin dimension calculation are presented.
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Anishchenko V. S., Vadivasova T. E., Strelkova G. I.
Abstract
In the present paper autonomous and nonautonomous oscillations of dynamical and stochastic systems are analyzed in the framework of common concepts. The definition of an attractor is introduced for a nonautonomous system. The definitions of self-sustained oscillations and a self-sustained oscillatory system is proposed, that generalize A.A.Andronov’s concept introduced for autonomous systems with one degree of freedom.
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Anishchenko V. S., Astakhov S. V., Vadivasova T. E., Feoktistov A. V.
Abstract
The effect of synchonization has been studied in a system of two coupled Van der Pol oscillators under external harmonic force. The bifurcation analysis has been carried out using the phase approach. The mechanisms of complete and partial synchronization have been established. The main type of bifurcation described in the paper is the saddle-node bifurcation of invariant curves that corresponds to the saddle-node bifurcation of two-dimensional tori in the complete system of differential equations for the dynamical system under study. We illustrate the bifurcational mechanisms obtained from numerical experiment by the results of physical experiment. The synchronization phenomenon in the vicinity of resonances on a torus with winding numbers 1 : 1 and 1 : 3 is considered in the physical experiment.
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Zakharova A. S., Vadivasova T. E., Anishchenko V. S.
Abstract
We investigate effective diffusion coefficient of instantaneous phase of chaotic self-sustained oscillations and its connection with synchronization threshold. It is showed that effective phase diffusion coefficient in contrast to maximal Lyapunov exponent allows to distinguish the regions of spiral and funnel attractor. We ascertain that synchronization threshold of chaos is in order-of-magnitude agreement with the value of diffusion coefficient divided by the mean frequency of self-sustained oscillations.
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Anishchenko V. S., Nikolaev S. M.
Abstract
We investigate synchronization of a resonant limit cycle on a two dimensional torus by an external harmonic signal. The regime of resonant limit cycle is realized in a system of two coupled Van der Pol oscillators, we consider the resonances 1:1 and 1:3. We analyse the influence of the generators coupling strength. We show, that generally the effect of synchronization of a resonant limit cycle on torus is followed by the distruction of the resonance in the system, next one of the basic frequencies of the system becomes locked, and then another. We consider the bifurcation mechanism of synchronization effect.
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Anishchenko V. S., Nikolaev S. M.
Abstract
We propose a new autonomous dynamical system of dimension $N = 4$ that demonstrates the regime of stable two-frequency motions. It is shown that system of two generators of quasiperiodic motions with symmetric coupling can realize motions on four-dimensional torus with resonant structures on it in the form of three- and two-dimensional torus. We show that with increase of noise intensity the higher the dimension of torus the faster it is destroyed.
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