Results 61 to 70 of about 6,930 (179)
Bifurcation of limit cycles from quartic isochronous systems
Electronic Journal of Differential Equations, 2014 This article concerns the bifurcation of limit cycles for a quartic system with an isochronous center. By using the averaging theory, it shows that under any small quartic homogeneous perturbations, at most two limit cycles bifurcate from the period ...
Linping Peng, Zhaosheng Feng
doaj
Petroleum Exploration and DevelopmentThe ultra-deep (deeper than 8 000 m) petroleum in the platform-basin zones of the Tarim Basin has been found mainly in the Lower Paleozoic reservoirs located to the east of the strike-slip fault F5 in the north depression.
Jin SU +13 more
doaj +1 more source
Journal of Cardiovascular Electrophysiology, EarlyView.ABSTRACT Background The left atrial posterior wall (LAPW) is often targeted in atrial fibrillation (AF) ablation due to its shared properties with pulmonary veins. However, substrate‐guided approaches using structural markers have shown inconsistent results.
Michael M. Malaty +7 more
wiley +1 more source
The period functions' higher order derivatives [PDF]
, 2012 We prove a formula for the $n$-th derivative of the period function $T$ in a period annulus of a planar differential system. For $n = 1$, we obtain Freire, Gasull and Guillamon formula for the period's first derivative \cite{FGG}.
Sabatini, Marco
core +2 more sources
Regeneration of the lizard heart after cryoinjury
Experimental Physiology, EarlyView.Abstract Lizards are renowned for their tremendous potential to heal tissues and organs after injury, but little is known about myocardial regeneration in reptiles generally. Here, we study cardiac regeneration in the leopard gecko (Eublepharis macularius) to fill the knowledge gap between traditional models of poikilothermic (zebrafish) and ...
Martina Gregorovicova +5 more
wiley +1 more source
Limit cycles bifurcating from the periodic annulus of cubic homogeneous polynomial centers
Electronic Journal of Differential Equations, 2015 We obtain an explicit polynomial whose simple positive real roots provide the limit cycles which bifurcate from the periodic orbits of any cubic homogeneous polynomial center when it is perturbed inside the class of all polynomial differential systems
Jaume Llibre +2 more
doaj
The Journal of Physiology, EarlyView.Abstract figure legend Schematic overview of the experimental and computational framework for investigating hiPSC‐CM electrophysiology with MEA systems. The MEA‐based model integrates experimental data with phenotype‐specific ionic models and tissue‐level heterogeneity.
Sofia Botti +2 more
wiley +1 more source
The Journal of Physiology, EarlyView.Abstract figure legend Integrated multimodal platform for panoramic cardiac mapping in isolated heart experiments. On the left, an image of the experimental setup during data acquisition showing a Langendorff‐perfused rabbit heart surrounded by three optical cameras (CAM A, B and C) positioned 120° apart, each coupled with high‐power LEDs for panoramic
Jimena Siles +8 more
wiley +1 more source
Limit cycles in piecewise smooth perturbations of a quartic isochronous center
Electronic Journal of Differential Equations, 2019 This article concerns the bifurcation of limit cycles from a quartic integrable and non-Hamiltonian system. By using the first order averaging method and some mathematical technique on estimating the number of the zeros, we show that under a class of ...
Haifeng Song, Linping Peng, Yong Cui
doaj
The Journal of Physiology, EarlyView.Abstract figure legend Schematic overview of the study's methodology and key findings. In a preclinical swine model, doxorubicin administration induced cardiotoxicity, characterized by diffuse fibrotic remodelling and altered electrical function, as assessed by magnetic resonance (MR) imaging and electrophysiological mapping.
Javier Villar‐Valero +7 more
wiley +1 more source