ISSN 0869-6632 (Print)
ISSN 2542-1905 (Online)

Прикладные задачи нелинейной теории колебаний и волн

Chaos and order in atmosheric dynamics part 3. Predictability of el nino

Topic. Based on the assumption that short-term climatic variations are nonchaotic, and, therefore, the paradigm of the limited predictability of weather formulated by E.N. Lorenz is not applicable to these variations, a question is posed about the unlimited predictability of the short-term climatic variations. It differs from the opinion generally accepted in climatology now that atmospheric motions of all time scales, beginning from daily weather variations, and including interannual, centennial and even millennial variations of climate are unstable. Aim.

Excitability of neuron-like generator under pulse stimulation

Subject of the study. Excitable dynamic systems are the systems having a stable equilibrium and capable of generating a large amplitude response to a weak stimulation. Excitable dynamic systems research is one of the most interesting and actual problems of modern nonlinear science. In the present paper dynamics of phase-locked loop with bandpass filter is studied under external pulse stimulation. Novelty. Excitability of the phase-controlled generator is studied under external pulse stimulation.

Bifurcations of attracting sets of cutting tool deformation displacements at the evolution of treatment process properties

Aim. The aim of the investigation is to study the evolutionary properties changes of the dynamic cutting system and the bifurcation of the attracting sets of the deformation displacement of the tool due to the irreversible transformation of the energy input in coupling tool-processing are considered. Method.

Optimization of granger causation method parameters for the study of limbic epilepsy

Purpose. The aim is to reveal the dependence of Granger causality results on chosen time scales of constructed empirical models in application to the task of investigation of evolution of coupling between brain areas during limbic seizures. Methods. We use combination of methods for coupling analysis of the experimental time series and approaches to modeling from the first principles, which reproduce the main time and frequency properties of the experimental signals.

Scenarios of the passage of the «population bottleneck» by an invasive species in the new model of population dynamics

Topic. The subject of the article is the expansion of the author’s research series in the direction of mathematical modeling of specific ecological situations and transitional regimes that arise in nonlinear population processes with complex internal regulation. Aim. The purpose of the article is to develop methods for modeling difficult-to-predict and abrupt changes in the ecology of communities of competing species.

Dynamics of two-component parabolic systems of schrodinger type

Issue. The paper considers the local dynamics of important for applications class of two-component nonlinear systems of parabolic equations. These systems contain a small parameter appearing in the diffusion coefficients and characterizing «closeness» of the initial system of a parabolic type to a hyperbolic one. On quite natural conditions critical cases in the problem about balance state stability are realized to linearized equation coefficients. Innovation.

Modeling of complicated dynamics of transistor generator

A mathematical model with 2.5 degrees of freedom under external periodic stimulation is investigated. It is a model of chaotic oscillator with bipolar transistor as an active element. It is shown that external periodic stimulation of the oscillator of such system allows to generate chaotic pulse stream.   DOI: 10.18500/0869-6632-2015-23-2-37-46

The effect of symmetry breaking on reversible systems with myxed dynamics

Theme – the effect of symmetry violation on the structure of the phase space of invertible systems. Aim – to study the changes in the phase space structure of invertible systems caused by the violation of symmetry, in particular, the possibility of multistability and the types of coexisting attractors. The peculiarities in comparison with the similar regimes in the systems with fixed constant dissipation also studied.

Asymptotic research of local dynamics of the Cahn–Hilliard family equations

Topic. Dynamics of well-known Cahn–Hilliard nonlinear equation is researched. In a state of balance stability task, critical cases were highlighted and bifurcation phenomena were researched. Aim. To formulate finite-dimensional and special infinite-dimensional equations, which can be represented as normal forms. Method. You can use as standard local dynamics research methods, based on constructing of normal forms on central manifolds, and special infinite-dimensional normalization ones.

On the question accounting of the resistance force at the hinge point of setting physical pendulum and its influence on the dynamics of movement

Topic. The paper is devoted to the analysis of the dynamics of a complex system, i.e. a hinge mechanism plus a compound pendulum, in which where a differential equation is found, describing its nonlinear behavior. Aim. The paper is in the analysis of nonlinear oscillations of a complex dynamical system, which is a hinge, a rod and a ball, setting together in the one way. It is assumed to obtain differential equation of motion of the pendulum with regard to the gimbal friction and the resistance of the continuum. Method.