хаос

Influence of Time-delay in the Coupling Channel on the Complete Synchronization of Chaos

Authors: Astakhov V. V., Astakhov S. V., Nekhodtseva E. I., Shabunin A. V.

In the current work the influence of delay in a coupling channel on the synchronization of regular and chotic oscillations in discrete maps and continuous time systems is studied. It is established that introduction of time delay in a discrete system prevents synchronization of chaos but allows synchronization of periodic and quasiperiodic oscillations. In a continuous time system with chaotic attractor the introduction of a small delay doesn’t make essential changes in its dynamics however the increasing of delay leads to the reverse period doubling cascade.

About Conditionality of Nonlinear Responce of Miogenic Response of Afferent Arteriola for Irregular Self-Sustained Oscillations of Nephron Proximal Pressure

Authors: Pavlova O. N., Postnov D. E.

By means of nonlinear dynamics and time series analysis we investigate the possible mechanisms for the onset of chaotic selfsustained dynamics in nephron tubular pressure that is observed experimentally. Our results suggests that the miogenic constriction mechanism of afferent arteriola plays the key role providing the nonlinear response on temporal variation of filtration rate.

Lorenz Attractor in a System with Delay: an Example of Pseudogyperbolic Chaos

Authors: Kuznetsov S. P., Kuptsov P. V.

Background and Objectives: The work contributes to a research direction aimed at search for and construction of physically realizable systems, which could fill the mathematical theory of pseudo-hyperbolic dynamics with physical content. Chaotic attractors belonging to this class generate genuine chaos that does not degrade under small variations of parameters and functions in dynamical equations.

From Anosov’s Dynamics on a Surface of Negative Curvature to Electronic Generator of Robust Chaos

Authors: Kuznetsov S. P.

Background and Objectives: Systems with hyperbolic chaos should be of preferable interest due to structural stability (roughness) that implies insensitivity to variation of parameters, manufacturing imperfections, interferences, etc. However, until recently, exclusively formal mathematical examples of this kind of dynamical behavior were known.

Influence of the Co-Phase Harmonis Excitation on the Dynamics of the Two Coupled Period Doubling Systems

Authors: Popova E. S., Seleznev E. P.

The system of two coupled maps under in-phase harmonic forcing is investigated numerically. By calculating of the lyapunov exponent spectrum the structure of control parameters space is investigated, the existence regions of the various multistable states are presented, the structure of the basins of attraction is studed.

Recovery of Models of Time-delay Systems from Short Experimental Time Series

Authors: Karavaev A. S., Ishbulatov Y. M., Borovkova E. I., Kulminskiy D. D., Khorev V. S., Kiselev A. R., Ponomarenko V. I., Prohorov M. D.

Time-delay systems reconstructed from short and noisy time series is conducted by the specialized method based on utilizing of driven system with the structure similar to the structure of the studied object. To show the efficiency of this approach, parameters were reconstructed for radiophysical chaotic generator and for the model of biological system.

Chaos in the System of Three Coupled Rotators: from Anosov Dynamics to Hyperbolic Attractor

Authors: Kuznetsov S. P.

The work presents an example of a system with chaotic dynamics built of three rotators by modifying a conservative system with hyperbolic Anosov dynamics. Results of a computational study of chaotic dynamics are considered (portraits of attractors, time dependences of the variables, Lyapunov exponents, and spectra) and good correspondence is observed between the dynamics on the attractor of the proposed system with the reduced model, characterized by the Anosov dynamics at appropriately defined energy.