Results 51 to 60 of about 18,615 (139)
Aging Cell, Volume 25, Issue 3, March 2026.In 83 older adults, baseline lymphocyte phenotypes quantified by flow cytometry predicted the magnitude and direction of HRV shifts during a 2‐min step test and recovery. Bayesian models show that the immune landscape shapes exercise autonomic trajectories in a domain‐specific manner, revealing heterogeneity in physiological resilience.
Matías Castillo‐Aguilar +5 more
wiley +1 more source
On the Euler characteristic of S$S$‐arithmetic groups
Journal of the London Mathematical Society, Volume 113, Issue 3, March 2026.Abstract We show that the sign of the Euler characteristic of an S$S$‐arithmetic subgroup of a simple algebraic group depends on the S$S$‐congruence completion only, except possibly in type 6D4${}^6 D_4$. Consequently, the sign is a profinite invariant for such S$S$‐arithmetic groups with the congruence subgroup property. This generalizes previous work
Holger Kammeyer, Giada Serafini
wiley +1 more source
Alternative determinism principle for topological analysis of chaos
, 2006 The topological analysis of chaos based on a knot-theoretic characterization of unstable periodic orbits has proved a powerful method, however knot theory can only be applied to three-dimensional systems.
E. Ott +4 more
core +2 more sources
Journal of Low Frequency Noise, Vibration and Active ControlThis article explores the nonlinear dynamical analysis and control of a 2 − DOF system that emulates the lateral vibration of an asymmetric rotor model under external, multi-parametric, and mixed excitation.
Randa A Elashmawey +3 more
doaj +1 more source
Experimental Physiology, Volume 111, Issue 3, Page 1466-1482, 1 March 2026.Abstract Sleep apnoea (SA) is ∼2 times more prevalent in men than women. However, this changes at menopause as the occurrence of SA increases and matches that of men. Menopause is a natural process, but it remains unclear why SA emerges only in a subpopulation of ageing women.
Danuzia Ambrozio‐Marques +4 more
wiley +1 more source
Polynomial approximation of Poincare maps for Hamiltonian system [PDF]
Different methods are proposed and tested for transforming a non-linear differential system, and more particularly a Hamiltonian one, into a map without integrating the whole orbit as in the well-known Poincare return map technique.
Froeschle, Claude, Petit, Jean-Marc
core +1 more source
Continuous symmetry reduction and return maps for high-dimensional flows
, 2010 We present two continuous symmetry reduction methods for reducing high-dimensional dissipative flows to local return maps. In the Hilbert polynomial basis approach, the equivariant dynamics is rewritten in terms of invariant coordinates. In the method of
Anosov +72 more
core +1 more source
Geophysical Research Letters, Volume 53, Issue 4, 28 February 2026.Abstract This study investigates the spectral and dynamic characteristics of turbulent fluctuations in the electric field within equatorial plasma bubbles using data from the Electric Field Detector aboard the China Seismo‐Electromagnetic Satellite‐01.
P. De Michelis +4 more
wiley +1 more source
Dimer models and conformal structures
Communications on Pure and Applied Mathematics, Volume 79, Issue 2, Page 340-446, February 2026.Abstract Dimer models have been the focus of intense research efforts over the last years. Our paper grew out of an effort to develop new methods to study minimizers or the asymptotic height functions of general dimer models and the geometry of their frozen boundaries.
Kari Astala +3 more
wiley +1 more source
Cosmological measurements, time and observables in (2+1)-dimensional gravity
, 2009 We investigate the relation between measurements and the physical observables for vacuum spacetimes with compact spatial surfaces in (2+1)-gravity with vanishing cosmological constant.
Ashtekar A +17 more
core +1 more source