Results 161 to 170 of about 271,382 (280)

From Stability to Chaos: A Complete Classification of the Damped Klein‐Gordon Dynamics

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT We investigate the transition between stability and chaos in the damped Klein‐Gordon equation, a fundamental model for wave propagation and energy dissipation. Using semigroup methods and spectral criteria, we derive explicit thresholds that determine when the system exhibits asymptotic stability and when it displays strong chaotic dynamics ...
Carlos Lizama, Marina Murillo‐Arcila, Julio Puerta‐Fernández   +2 more
wiley   +1 more source

Neuromuscular Profile of CrossFit^® Athletes: Part 1-Isometric and Ballistic Performance. [PDF]

J Funct Morphol Kinesiol
Alonso-Aubin DA, Jiménez-Ormeño E, Gallo-Salazar C, Giráldez-Costas V, Ruiz-Vicente D, Zafra-Díaz S, Areces-Corcuera F, Ruiz-Moreno C.   +7 more
europepmc   +1 more source

Shape Derivatives of the Eigenvalues of the de Rham Complex for Lipschitz Deformations and Variable Coefficients: Part II

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT In this second part of our series of papers, we develop an abstract framework suitable for de Rham complexes that depend on a parameter belonging to an arbitrary Banach space. Our primary focus is on spectral perturbation problems and the differentiability of eigenvalues with respect to perturbations of the involved parameters. As a byproduct,
Pier Domenico Lamberti, Dirk Pauly, Michele Zaccaron   +2 more
wiley   +1 more source

Age-related alterations in trunk extensor force control during isometric and isokinetic contractions. [PDF]

Sci Rep
Parrella M, Arvanitidis M, Borzuola R, Jiménez-Grande D, Macaluso A, Falla D.   +5 more
europepmc   +1 more source

Linear Toroidal‐Inertial Waves on A Differentially Rotating Sphere with Application to Helioseismology: Modeling, Forward and Inverse Problems

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT This paper develops a mathematical framework for interpreting observations of solar inertial waves in an idealized setting. Under the assumption of purely toroidal linear waves on the sphere, the stream function of the flow satisfies a fourth‐order scalar equation.
Tram Thi Ngoc Nguyen, Damien Fournier, Laurent Gizon, Thorsten Hohage   +3 more
wiley   +1 more source

Effect of knee flexion on muscle oxygen saturation in adults during a 40-s isometric squat. [PDF]

Physiol Rep
Portilla-Dorado E, Sendra-Perez C, Marzano-Felisatti JM, Aparicio-Aparicio I, Cibrián Ortiz de Anda RM, Priego-Quesada JI.   +5 more
europepmc   +1 more source

Reachable Workspace as a Clinical Outcome for Upper Extremity Function: A Narrative Review

Muscle &Nerve, EarlyView.
ABSTRACT Motion sensing technology can be utilized to capture detailed upper extremity (UE) motion to reconstruct an individual's three‐dimensional (3D) reachable workspace (RWS). The RWS can be quantified as relative surface area (RSA), providing an innovative surrogate measure to assess UE mobility and function.
Jay J. Han, Lawrence J. Hayward, Christina Adams, Juan Perez‐Ibarra   +3 more
wiley   +1 more source

Effects of Knee Joint Angle on Intramuscular Blood Flow and Muscle Deoxygenation During Fatiguing Isometric Contractions. [PDF]

Scand J Med Sci Sports
Izumi K, Katayama K, Kano Y, Tanaka N, Akima H.   +4 more
europepmc   +1 more source

Shear Wave Elastography to Assess Respiratory Muscle Function in Congenital Myopathies

Muscle &Nerve, EarlyView.
ABSTRACT Introduction/Aims Respiratory muscle dysfunction is prevalent in congenital myopathies and often leads to respiratory failure. Ultrasound shear wave elastography (SWE) measures tissue elasticity and has been proposed as an alternative to invasive measures of respiratory muscle contractility.
J. L. M. van Doorn, D. Jans, C. L. de Korte, B. G. M. van Engelen, N. C. Voermans, N. van Alfen, C. A. C. Ottenheijm, D. Bachasson, J. Doorduin   +8 more
wiley   +1 more source

Intersegmental Modulation of Lower-Limb Corticospinal Excitability and Inhibition Induced by Upper-Limb Isometric Contractions: A Systematic Review. [PDF]

Eur J Neurosci
de Mello Rosa GH, Pereira GS, da Silva Boni F, da Silva ML, de Araújo JE.   +4 more
europepmc   +1 more source