Results 1 to 10 of about 110,223 (206)

Entrainment of randomly coupled oscillator networks by a pacemaker [PDF]

, 2004
Entrainment by a pacemaker, representing an element with a higher frequency, is numerically investigated for several classes of random networks which consist of identical phase oscillators. We find that the entrainment frequency window of a network decreases exponentially with its depth, defined as the mean forward distance of the elements from the ...
A. N. Zaikin, A. T. Winfree, Alexander S. Mikhailov, E. E. Abrahamson, Hiroshi Kori, M. Stich, S. C. Manrubia, S. J. Kuhlman, S. N. Dorogovtsev, Y. Kuramoto   +9 more
arxiv   +6 more sources

Delay-induced multiple stochastic resonances on scale-free neuronal networks [PDF]

Chaos 19 (2009) 023112, 2009
We study the effects of periodic subthreshold pacemaker activity and time-delayed coupling on stochastic resonance over scale-free neuronal networks. As the two extreme options, we introduce the pacemaker respectively to the neuron with the highest degree and to one of the neurons with the lowest degree within the network, but we also consider the case
Guanrong Chen, Kandel E. R., Matjaž Perc, Qingyun Wang, Wang Q. Y., Wang Q. Y., Zhisheng Duan   +6 more
arxiv   +3 more sources

Self-organized stable pacemakers near the onset of birhythmicity [PDF]

, 2000
General amplitude equations for reaction-diffusion systems near to the soft onset of birhythmicity described by a supercritical pitchfork-Hopf bifurcation are derived. Using these equations and applying singular perturbation theory, we show that stable autonomous pacemakers represent a generic kind of spatiotemporal patterns in such systems.
A. B. Rovinsky, A. Goldbeter, A. L. Kawczynski, A. M. Zhabotinsky, A. N. Zaikin, A. S. Mikhailov, Alexander S. Mikhailov, B. Janiaud, C. Pérez-Iratxeta, H. Kokubo, H. Sakaguchi, H.-J. Krug, J. J. Tyson, K. J. Lee, M. Alamgir, M. Assenheimer, M. Ipsen, M. Ipsen, Mads Ipsen, Michael Stich, O. Decroly, O. Nekhamkina, P. Lamba, R. J. Deissler, S. Jakubith, S. Nasuno, T. Ohta, V. A. Vasiliev, Y. A. Kuznetsov, Y. Kuramoto   +29 more
arxiv   +3 more sources

Reentrant transition in coupled noisy oscillators [PDF]

Physical Review E 91, 012901 (2015), 2015
We report on a novel type of instability observed in a noisy oscillator unidirectionally coupled to a pacemaker. Using a phase oscillator model, we find that, as the coupling strength is increased, the noisy oscillator lags behind the pacemaker more frequently and the phase slip rate increases, which may not be observed in averaged phase models such as
Kobayashi, Yasuaki, Kori, Hiroshi
arxiv   +5 more sources

Genetically engineered cardiac pacemaker: stem cells transfected with HCN2 gene and myocytes - a model [PDF]

arXiv, 2005
Artificial biological pacemakers were developed and tested in canine ventricles. Next steps will require obtaining oscillations sensitive to external regulations, and robust with respect to long term drifts of expression levels of pacemaker currents and gap junctions. We introduce mathematical models intended to be used in parallel with the experiments.
Kanani, Sandra, Krinsky, Valentine, Pumir, Alain   +2 more
arxiv   +2 more sources

Endogenous driving and synchronization in cardiac and uterine virtual tissues: bifurcations and local coupling [PDF]

, 2006
Cardiac and uterine muscle cells and tissue can be either autorhythmic or excitable. These behaviours exchange stability at bifurcations produced by changes in parameters, which if spatially localized can produce an ectopic pacemaking focus.
Benson, A.P., Clayton, R.H., Holden, A.V., Kharche, S., Tong, W.C.   +4 more
core   +1 more source

The orbit and nature of the semi-detached stellar companion of Sgr A* super-massive blackhole [PDF]

ApJ, 2021, 915, 2, 2021
In three previous papers I showed that the series of the midpoints of the times of all the X-ray flares of Sgr A* that have been detected so far harbor a statistical trend termed pacemaker regularity. This means that X-ray flares are detected more frequently around time points that are a subset of a periodic grid on the time axis of period P_X=0.1032 ...
arxiv   +1 more source

Entrainment of Coupled Oscillators on Regular Networks by Pacemakers [PDF]

Phys. Rev. E 73, 036218 (2006), 2006
We study Kuramoto oscillators, driven by one pacemaker, on $d$-dimensional regular topologies with nearest neighbor interactions. We derive the analytical expressions for the common frequency in the case of phase-locked motion and for the critical frequency of the pacemaker, placed at an arbitrary position in the lattice, so that above the critical ...
arxiv   +1 more source

miR-786 Regulation of a Fatty-Acid Elongase Contributes to Rhythmic Calcium-Wave Initiation in \u3cem\u3eC. elegans\u3c/em\u3e [PDF]

, 2012
Background: Rhythmic behaviors are ubiquitous phenomena in animals. In C. elegans, defecation is an ultradian rhythmic behavior: every ∼50 s a calcium wave initiating in the posterior intestinal cells triggers the defecation motor program that comprises ...
Abbott, Allison L., Allman, Erik, Immerman, Lois, Kemp, Benedict J, Mohnen, Megan, Nerhke, Keith, Peters, Maureen A   +6 more
core   +2 more sources

Possible evidence from the flaring activity of Sgr A* for a star at a distance of ~3.3 Schwarzscild radii from the blackhole [PDF]

2020, ApJ, 896, 74, 2020
The frequent flaring events in the X-ray and the NIR radiation of Sgr A* seem not to be periodic in time. However, statistical regularities, here termed "modulations by a pacemaker", are found in the recorded arrival times of both types of events. The characteristic time of the X-ray pacemaker is 149 min and that of the NIR pacemaker is 40 min.
arxiv   +1 more source