Results 21 to 30 of about 4,498,304 (271)
Моделирование и анализ информационных систем, 2015 We study the existence, structure and stability of periodic solutions of nonlinear systems referred to in the title.
S. A. Kashchenko, A. S. Polstyanov
doaj +1 more source
Relaxation Oscillations in a System with Delays Modeling the Predator-Prey Problem
Моделирование и анализ информационных систем, 2013 A new asymptotic method for investigating complex relaxation oscillations of a system with delay was offered. Applying it, we can reduce the problem of predator-prey system dynamics to problem of one-dimensional maps analysis.
S. A. Kaschenko
doaj +1 more source
Large time‐varying parameter VARs: A nonparametric approach [PDF]
Journal of Applied Econometrics, 2017 SummaryIn this paper we introduce a nonparametric estimation method for a large Vector Autoregression (VAR) with time‐varying parameters. The estimators and their asymptotic distributions are available in closed form. This makes the method computationally efficient and capable of handling information sets as large as those typically handled by factor ...
Kapetanios, George +2 more
openaire +2 more sources
Singular perturbation for nonlinear boundary-value problems
International Journal of Mathematics and Mathematical Sciences, 1979 Asymptotic solutions of a class of nonlinear boundary-value problems are studied. The problem is a model arising in nuclear energy distribution. For large values of the parameter, the differential equations are of the singular-perturbation type and ...
Rina Ling
doaj +1 more source
Mathematical Modelling and Analysis, 2017 We consider the eigenvalue problem with Robin boundary condition ∆u + λu = 0 in Ω, ∂u/∂ν + αu = 0 on ∂Ω, where Ω ⊂ Rn , n ≥ 2 is a bounded domain with a smooth boundary, ν is the outward unit normal, α is a real parameter.
Alexey V. Filinovskiy
doaj +1 more source
Dynamics of a System of Two Simplest Oscillators with Finite Non-linear Feedbacks
Моделирование и анализ информационных систем, 2016 In this paper, we consider a singularly perturbed system of two differential equations with delay which simulates two coupled oscillators with nonlinear feedback. Feedback function is assumed to be finite, piecewise continuous, and with a constant sign. In
A. A. Kashchenko
doaj +1 more source
Neutralino Dark Matter in Minimal Supergravity: Direct Detection vs. Collider Searches [PDF]
, 1997 We calculate expected event rates for direct detection of relic neutralinos as a function of parameter space of the minimal supergravity model. Numerical results are presented for the specific case of a $^{73}$Ge detector.
A. Bottino +60 more
core +2 more sources
A Family of Non-rough Cycles in a System of Two Coupled Delayed Generators
Моделирование и анализ информационных систем, 2017 In this paper, we consider the nonlocal dynamics of the model of two coupled oscillators with delayed feedback. This model has the form of a system of two differential equations with delay. The feedback function is non-linear, finite and smooth. The main
Aleksandra A. Kashchenko
doaj +1 more source
Large Sample Comparison of Parameter Estimates in Gamma Raindrop Distributions
Atmosphere, 2020 Raindrop size distributions have been characterized through the gamma family. Over the years, quite a few estimates of these gamma parameters have been proposed. The natural question for the practitioner, then, is what estimation procedure should be used.
Roger W. Johnson, Donna V. Kliche
doaj +1 more source
Relaxation Oscillations in Models of Multi-Species Biocenose
Моделирование и анализ информационных систем, 2013 Some families of mathematical models of biological populations are considered. Invariant ratios between the parameters which characterize this or that population are revealed.
S. A. Kaschenko
doaj +1 more source