Results 71 to 80 of about 1,998,384 (219)

Dynamics analysis of a nonlinear controlled predator–prey model with complex Poincaré map

Nonlinear Analysis
In this paper, we propose a class of predator–prey models with nonlinear state-dependent feedback control in the saturated state. The nonlinear state impulse control leads to a diversity of pulse and phase sets such that the Poincaré map built on the ...
Huidong Cheng, Xin Zhang, Tonghua Zhang, Jingli Fu   +3 more
doaj   +3 more sources

Acute Effects of Transcutaneous Tibial Nerve Stimulation on Autonomic Nervous System Activity in Healthy Volunteers: An Exploratory Study

Neurourology and Urodynamics, EarlyView.
ABSTRACT Aim Autonomic nervous system (ANS) imbalance may contribute to functional pelvic disorders such as overactive bladder (OAB). Transcutaneous tibial nerve stimulation (TTNS) is a non‐invasive therapy for OAB; however, its autonomic modulation mechanisms remain unclear. This exploratory study evaluated the acute effects of TTNS on ANS activity in
Javier A. Muñoz, Carla Basualto‐Alarcón, Matías D. del Camino, Diego Leiva, Pablo Gálvez, Joaquín García, Gabriela Asenjo, Alfonso León, Joaquín Soto, Juan P. Valdevenito   +9 more
wiley   +1 more source

Period annulus of the harmonic oscillator with zero cyclicity under perturbations with a homogeneous polynomial field

Electronic Journal of Qualitative Theory of Differential Equations, 2019
In this work we prove, using averaging theory at any order in the small perturbation parameter, that the period annulus of the harmonic oscillator has cyclicity zero (no limit cycles bifurcate) when it is perturbed by any fixed homogeneous polynomial ...
Isaac García, Susanna Maza
doaj   +1 more source

Applying Dynamics/Cost Parameter Continuation to the Optimal Guidance of Variable‐Speed Unicycle

Optimal Control Applications and Methods, EarlyView.
(a) Classical parameter continuation method diverges. (b) Dynamics/cost parameter continuation method converges. ABSTRACT The problem of a variable‐speed unicycle guidance to the stationary target is considered. The vehicle should be guided to the origin while minimizing the energy loss due to the induced drag.
Gleb Merkulov, Vladimir Turetsky, Tal Shima   +2 more
wiley   +1 more source

Antipredator behavior of a nonsmooth ecological model with a state threshold control strategy

AIMS Mathematics
A nonsmooth ecological model was proposed and analyzed, focusing on IPM, state-dependent feedback control strategies, and anti-predator behavior. The main objective was to investigate the impact of anti-predator behavior on successful pest control, pest ...
Shuai Chen
doaj   +1 more source

Adaptive Sliding‐Mode Control of a Perturbed Diffusion Process With Pointwise In‐Domain Actuation

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT A sliding mode–based adaptive control law is proposed for a class of diffusion processes featuring a spatially‐varying uncertain diffusivity and equipped with several point‐wise actuators located at the two boundaries of the spatial domain as well as in its interior.
Paul Mayr, Alessandro Pisano, Stefan Koch, Markus Reichhartinger   +3 more
wiley   +1 more source

Effect of Various Excitation Conditions on Vibrational Energy in a Multi-Degree-of-Freedom Torsional System with Piecewise-Type Nonlinearities

Energies, 2015
Dynamic behaviors in practical driveline systems for wind turbines or vehicles are inherently affected by multiple nonlinearities such as piecewise-type torsional springs.
Jong-Yun Yoon, Byeongil Kim
doaj   +1 more source

Solution of one-dimensional Dirac equation via Poincaré map [PDF]

, 2011
We solve the general one-dimensional Dirac equation using a “Poincaré map” approach which avoids any approximation to the spacial derivatives and reduces the problem to a simple recursive relation which is very practical from the numerical implementation
H. Bahlouli, E. B. Choubabi, A. Jellal
semanticscholar   +1 more source

Early Maturation of Heart Rate Variability in Very Preterm Infants Depends on Neonatal Factors and Is Associated With Neurodevelopmental Risk

Acta Paediatrica, EarlyView.
ABSTRACT Aim This study investigated central autonomic network maturation deviations using a previously defined machine learning model set to estimate a functional maturation age (FMA) from heart rate variability (HRV) analysis. We investigated whether these deviations were associated with maternal, fetal, perinatal, or postnatal complications and with
Léa Bonneau, Cyril Flamant, Maxime Esvan, Jean Michel Roué, Géraldine Favrais, Géraldine Gascoin, Sandie Cabon, Fabienne Porée, Guy Carrault, Patrick Pladys   +9 more
wiley   +1 more source

Preliminary Clustering: Exploring the Interplay of Burnout, Stress, Turnover, Psychological Flexibility and Distress in a French Nurse Sample

Journal of Advanced Nursing, EarlyView.
ABSTRACT Objective To identify latent profiles of hospital nurses based on the combination of occupational demands, psychological symptoms and psychological flexibility. Examine how these profiles relate to job turnover intentions. Design Cross‐sectional online survey.
Marie Charlotte Mollet, Oulmann Zerhouni, Corinne Isnard Bagnis, Lucia Romo   +3 more
wiley   +1 more source