The beautiful spiral waves of oxidation in the BelousovZhabotinskii reaction [20] are the source of many interesting questions about periodic structures in excitable ... Get Price …

 · The spiral and concentric (target) waves found to date in spatially extended chemical or physical systems are smooth and continuous; only living systems, such as seashells, lichens, pine cones, or flowers, have been shown to demonstrate segmentation of …

Published15 January 1994. Physics. Journal of Chemical Physics. A systematic study of spiral waves in a realistic reaction‐diffusion model describing the isothermal CO oxidation …

 · This function simulates spiral waves, which are hypothesized to underlie reentrant tachycardia. The spiral waves can be initiated by two different cardiac pacing …

The theoretical study of spatio-temporal phenomena such as target waves or spiral waves in reaction-diffusion systems is several decades old. However the investigations generally …

 · Spiral waves are striking self-organized coherent structures that organize spatio-temporal dynamics in dissipative, spatially extended systems. In this paper, we provide a conceptual approach to various properties of spiral waves.

Corpus ID: 27265510 Spiral Waves of Chemical Activity A. Winfree Published 11 February 1972 Geology Science The Zhabotinsky-Zaikin reagent propagates waves of chemical activity. Reaction kinetics remain to be fully resolved, but certain features of wave behavior are determined by purely geometrical considerations.

 · Researchers at Georgia Tech and clinicians at the Emory University School of Medicine are bringing a new understanding to these complicated conditions with the first high-resolution visualizations of stable spiral waves in human ventricles. Sep 07, 2022 — Atlanta, GA. Electrical signals tell the heart to contract, but when the signals form ...

Bifurcation theory of meandering spiral waves C. Wulff Mathematics 1996 Spiral waves are a typical phenomenon of spatio-temporal pattern formation. They are observed in various biological and chemical systems, for example in the catalysis on platinum surfaces and in the… Expand 6 View 1 excerpt, cites background Save Alert

Self Destructing Spiral Waves: Global Simulations of a Spiral Wave. 6 Jul 2016.Abstract: We present results from a suite of three dimensional global hydrodynamic simulations which

The beautiful spiral waves of oxidation in the BelousovZhabotinskii reaction [20] are the source of many interesting questions about periodic structures in excitable ... Get Price PlanetWaves :: Spiral Door :: Annual 2007

 · Spiral waves lead to dangerous arrhythmias in the cardiac system. In 2015 Burton et al. demonstrated the reversal of the spiral wave chirality through the rotating spiral-shaped illumination on the optogenetically modified cardiac monolayers. We show that this process entails the recreation of a spiral wave. We show how this methodology can be …

Spiral waves lead to dangerous arrhythmias in the cardiac system. In 2015 Burton et al. demonstrated the reversal of the spiral wave chirality through the rotating spiral-shaped illumination on the optogenetically modified cardiac monolayers. We show that this process entails the recreation of a spi …

 · The original circular locomotion with large diameter is driven by the push-pull asymmetry of the wavefront and waveback of the simple spiral waves initiated at one corner of gel. By harnessing this mode transition of the gel locomotion via coded illumination, we design programmable pathways of nature-inspired angular locomotion of the gel.

 · Spiral Waves in a Surface Reaction: Model Calculations Authors: Markus Bär Physikalisch-Technische Bundesanstalt N Gottschanlk Markus Eiswirth Fritz Haber Institute of the Max Planck Society...

 · The low velocity, ν S, and rotation frequency, ω S, of segmented spirals appear to be necessary for their emergence and stability; ν S and ω S are significantly …

We then show that the one-armed spiral waves are probably stable and the multi-armed ones are unstable for $| q |$ small. Next, by numerical continuation methods, we …

 · Spiral waves anchored to obstacles in cardiac tissues may cause lethal arrhythmia. To unpin these anchored spirals, comparing to high-voltage side-effect traditional therapies, wave emission...

develops into spiral density waves. Their pitch angles evolve from Π ∼ 15°–22° at the onset, to ∼11°–14°, over ∼65au to 150au. Self-gravity enhances the density contrast of the spiral waves, as also reported previously for spirals launched by planets. Our control simulations with unshadowed irradiation do not develop structures, except

 · The spiral waves can be initiated by two different cardiac pacing methods: (1) two-point stimulation where a point stimulus is delivered in the center of the domain followed by another point stimulus on the partially refractory wake of the first wave of excitation.

 · The original circular locomotion with large diameter is driven by the push-pull asymmetry of the wavefront and waveback of the simple spiral waves initiated at one …

 · Spiral waves are ubiquitous in diverse physical, chemical, and biological systems. Periodic external fields, such as polarized electric fields, especially circularly polarized electric fields which possess rotation symmetry may have significant effects on spiral wave dynamics. In this paper, control of spiral waves in excitable media under …

 · The propagation of spiral-shaped excitation waves is a prominent example of self-organization in nonequilibrium systems. The properties of these waves are studied in a chemical model system--the Belousov-Zhabotinsky (BZ) reaction--and in various biological excitable media such as heart or neuronal tissue.

 · Amidst all these dynamical states, the spiral waves (SW) are an exciting phenomenon observed in many excitable chemical and biological systems,,, . The …

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 · The spiral waves look like non-localized objects, filling up all available space, but behave like localized objects. The mathematical nature of this paradox have been brought to the forefront by Biktasheva and Biktashev (2003) in terms of perturbative dynamics of spiral waves, i.e. resonant and inhomogeneity-induced drifts . Consider a reaction ...

 · We then show that the one-armed spiral waves are probably stable and the multi-armed ones are unstable for $| q |$ small. Next, by numerical continuation methods, we construct spiral waves for all q. These calculations show that the one-armed spiral waves are unstable when $| q | > 1.397 cdots $.

 · Outwardly rotating spiral waves (spirals) or concentric waves (pacemakers) are vivid and ubiquitous phenomena in reaction-diffusion systems.Spirals are observed in nonlinear homogeneous chemical systems (1, 3–6), in heterogeneous catalytic reactions on crystal surfaces (), and in a variety of biological systems, e.g., in cardiac muscle (8–10), …

Spiral Waves in Reaction-Diffusion Equations Author: Patrick S. Hagan Authors Info & Claims SIAM Journal on Applied Mathematics Volume 42 Issue 4 Aug 1982 pp 762–786 https://doi/10.1137/0142054 Online: 12 July 2006 Publication History 1 0 Metrics Total Citations 1 Total Downloads 0 Last 12 Months 0 Last 6 weeks 0

 · Moreover, the authors study the trajectories of the spiral tip of spiral waves in both states after the pulse is applied and find two types of trajectories, a spiral trajectory and a spiral-inward-petal trajectory. The frequency of the spiral wave in the excited state is less than that in the ground state.