Results 131 to 140 of about 548,689 (195)

Characterizing short‐term linear and nonlinear heart rate variability in typically developing children and adolescents

Physiological Reports, Volume 14, Issue 19, October 2026.
Nonlinear heart rate variability differed by age and sex in typically developing youth. Nonlinear measures were associated with parasympathetic indices. Figure generated in Biorender. Abstract Linear heart rate variability (HRV) quantifies heart rate (HR) changes due to stochastic processes while nonlinear HRV captures the complexity of the HR ...
Alexs A. Matias, Michele N. D'Agata, Krista M. Szymanski, Evan C. Ciecko, Melissa A. Witman   +4 more
wiley   +1 more source

Propagation-induced Frequency-dependent Polarization Properties of Fast Radio Burst

The Astrophysical Journal
Frequency-dependent polarization properties provide crucial insights into the radiation mechanisms and magnetic environments of fast radio bursts (FRBs).
Wei-Yang Wang, Xiaohui Liu, Dongzi Li, Bing Zhang, Chen-Hui Niu, Jifeng Liu, Renxin Xu, Weiwei Zhu, Kejia Lee   +8 more
doaj   +1 more source

Generation of flower high-order Poincaré sphere laser beams from a spatial light modulator. [PDF]

Sci Rep, 2016
Lu TH, Huang TD, Wang JG, Wang LW, Alfano RR.   +4 more
europepmc   +1 more source

Simplicial manifolds, bistellar flips and a 16-vertex triangulation of the Poincaré homology 3-sphere

, 2000
We present an algorithm based on bistellar operations that provides a useful tool for the construction of simplicial manifolds with few vertices. As an example, we obtain a 16-vertex triangulation of the Poincaré homology 3-sphere; we construct an ...
Anders Björner, Frank H. Lutz
core  

La Conjetura de Poincaré: un siglo de investigación

, 2004
Poincaré afirmó, y tras no encontrar una prueba, preguntó lo que se conoce como Conjetura de Poincaré: Toda variedad tridimensional cerrada y simplemente conexa es la esfera.
Lozano Imízcoz, María Teresa
core  

Poincaré i l'aritmètica

, 2004
Les contribucions a l'aritmètica degudes a Poincaré comprenen una trentena de publicacions, recopilades principalment en els volums II i V de les seves obres.
Bayer, Pilar
core  

Degree-of-polarization modulation for high-dimensional optical computing. [PDF]

Nature
Petrini A, Conti C, Pierangeli D.
europepmc   +1 more source

Quartic Rigid Systems in the Plane and in the Poincaré Sphere

[eng] We consider the planar family of rigid systems of the form x′ = −y + x P(x, y), y′ = x + y P(x, y), where P is any polynomial with monomials of degree one and three.
Calderón, L.A., Bravo, J.L., Álvarez, M.J.   +2 more
core  

On a generalization of Cannon's conjecture for cubulated hyperbolic groups. [PDF]

Math Ann
Bregman C, Incerti-Medici M.
europepmc   +1 more source

Partial coherence control delivers skyrmionic topological resilience and transitions. [PDF]

Nat Commun
Liu Y, Chen S, Guo Z, Zhu K, Chen Y, Cai Y, Shen Y, Wang F.   +7 more
europepmc   +1 more source