Microchaos in human postural balance: Sensory dead zones and sampled time-delayed feedback

JG Milton, T Insperger, W Cook, DM Harris, G Stepan - Physical review E, 2018 - APS
Models for the stabilization of an inverted pendulum figure prominently in studies of human
balance control. Surprisingly, fluctuations in measures related to the vertical displacement …

[HTML][HTML] Effective reduced models from delay differential equations: Bifurcations, tipping solution paths, and ENSO variability

MD Chekroun, H Liu - Physica D: Nonlinear Phenomena, 2024 - Elsevier
Conceptual delay models have played a key role in the analysis and understanding of El
Niño-Southern Oscillation (ENSO) variability. Based on such delay models, we propose in …

Nonlinear semigroups for delay equations in Hilbert spaces, inertial manifolds and dimension estimates

M Anikushin - arXiv preprint arXiv:2004.13141, 2020 - arxiv.org
We study the well-posedness of nonautonomous nonlinear delay equations in $\mathbb
{R}^{n} $ as evolutionary equations in a proper Hilbert space. We present a construction of …

[PDF][PDF] Numerical bifurcation analysis of a class of nonlinear renewal equations

D Breda, O Diekmann, D Liessi… - Electronic Journal of …, 2016 - real.mtak.hu
We show, by way of an example, that numerical bifurcation tools for ODE yield reliable
bifurcation diagrams when applied to the pseudospectral approximation of a one-parameter …

Approximation of eigenvalues of evolution operators for linear renewal equations

D Breda, D Liessi - SIAM Journal on Numerical Analysis, 2018 - SIAM
A numerical method based on pseudospectral collocation is proposed to approximate the
eigenvalues of evolution operators for linear renewal equations, which are retarded …

A practical approach to computing Lyapunov exponents of renewal and delay equations

D Breda, D Liessi - arXiv preprint arXiv:2310.15400, 2023 - arxiv.org
We propose a method for computing the Lyapunov exponents of renewal equations (delay
equations of Volterra type) and of coupled systems of renewal and delay differential …

Dynamics of a mathematical hematopoietic stem-cell population model

DC De Souza, AR Humphries - SIAM Journal on Applied Dynamical Systems, 2019 - SIAM
We explore the bifurcations and dynamics of a scalar differential equation with a single
constant delay which models the population of human hematopoietic stem cells in the bone …

Bifurcations and chaos of time delay Lorenz system with dimension 2n+ 1

GM Mahmoud, AA Arafa, EE Mahmoud - The European Physical Journal …, 2017 - Springer
The aim of this paper is to introduce a generalized form of the Lorenz system with time delay.
Instead of considering each state variable of the Lorenz system belonging to R𝕉, the paper …

From dynamical systems with time-varying delay to circle maps and Koopman operators

D Müller, A Otto, G Radons - Physical Review E, 2017 - APS
In this paper, we investigate the influence of the retarded access by a time-varying delay on
the dynamics of delay systems. We show that there are two universality classes of delays …

Pseudospectral reduction to compute Lyapunov exponents of delay differential equations

D Breda, S Della Schiava - DISCRETE AND CONTINUOUS …, 2018 - air.uniud.it
A recent pseudospectral collocation is used to reduce a nonlinear delay differential equation
to a system of ordinary differential equations. Standard methods are then applied to compute …