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Spiral waves now correspond to the states where this phase variable has a non-trivial winding number away from the center of rotation. The core can then be thought of as …

83.33% accuracy for spiral; 71.33% accuracy for the wave; It's also interesting to note that the Random Forest trained on the spiral dataset obtained 76.00% sensitivity, meaning that the model was …

Sep 07, 2022. — Atlanta, GA. Electrical signals tell the heart to contract, but when the signals form spiral waves, they can lead to dangerous cardiac events like tachycardia and fibrillation. Researchers at the Georgia Institute of Technology and clinicians at Emory University School of Medicine are bringing a new understanding to these ...

Here, we propose a quantitative description for the spiral wave drift induced by weak electric fields, and provide the explicit equations for the spiral wave drift speed …

Abstract. The existence of two frequency regimes in a two-dimensional (2D) Rosenzweig–MacArthur ecological network is debated. The semi-discrete approximation …

In the second discussion we considered frequency external excitation of ϕ ext = cos (t) + 0.5 cos (200t) and captured the spiral wave formations as in Fig. 3 (a).As in [35] we could observe the formation of the spiral waves for a much higher amp of stimuli compared to Fig. 2.We plotted the periods of individual nodes and showed them in Fig. 3 …

Nature Physics - For a system to exhibit spiral patterns one would expect its parts to behave synchronously, as in a Mexican wave. Proving the contrary, chemical …

Spiral waves with larger area appear in network with larger g value [Figs. 11 (a1)—(a2)]. In Fig. 11 (c1), the wave pattern is a mixed of target and the spiral waves, and over time the target wave gradually replaces the spiral wave and occupies the entire network [Fig. 11 (c2)].

Think of this rush of biochemicals as a wave. As these biochemicals are completely flushed out of your bloodstream, and the physiological feelings subside, it feels as if the wave has passed. From the point of an initial trigger, Dr. Bolte-Taylor described that each surge or wave of emotion has a biochemical lifespan of roughly 90 seconds.

In the previous researches, the direction of the electric field remains fixed and does not change over time. Considering a polarized electric field with rotational symmetry is necessary due to the ability of spiral waves to spontaneously rotate around their core and possess rotational symmetry [36].Considering two mutually perpendicular alternating …

Abstract. 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 ...

The theory of spiral density waves had its origin approximately six decades ago in an attempt to reconcile the winding dilemma of material spiral arms in flattened disk galaxies. We begin with the earliest calculations of linear and nonlinear spiral density waves in disk galaxies, in which the hypothesis of quasi-stationary spiral structure (QSSS) plays a …

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Summary. This chapter is about the existence of long cycles or long waves of economic growth. No one who has examined the dynamics of capitalist economies over long historical periods can doubt that they experience significant longterm variations in their aggregate performance. The question is whether these long-term variations are more …

Thus, we aim to merge together several approaches such as speech disorders [50], handwriting [36], hand tremor [54], spiral-wave sketching [51, 52] and analysing signals from the wearable ...

Rotating spiral waves, also known as rotors (1) or vortices (2), occur in a variety of nonlinear excitable media. Biological ex-amples of such media include populations of …

The main objective of this paper is to introduce a new type of spiral waves – spiral waves of divergence. The paper is organized as follows. The classical Barkley model of spiral waves is introduced in Section 2. Idempotents, nilpotents, and their role in iterative maps of matrices is discussed in Section 3.

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Another example of spiral waves from a different animal is shown in Figure S1. More information of spiral waves and plane waves can be obtained from supplement movies (Movies S1, S2, S6, and S7). Neuron Spiral Waves in the Intact Cortex Neuron 68, 978–990, December 9, 2010 ª2010 Elsevier Inc. 979

A spatially uniform periodic forcing applied to this reaction in an excitable state induces a wide variety of spatiotemporal patterns [16], [17], [18].For instance, a resonance drift of spiral waves can occur, if the forcing frequency is chosen to be close to the eigenfrequency of the rotating spiral waves [18], [19].Implementing control requires a …

The diameter of a flat wire wave spring increases when compressed in the axial direction. The following formula is an example of its maximum achievable outside diameter when compressed at the block level. R = …

Spiral waves now correspond to the states where this phase variable has a non-trivial winding number away from the center of rotation. The core can then be thought of as merely a necessary Figure 1: Shown is a contour plot of an Archimedean planar spiral wave for a xed value of time. The spiral wave rotates rigidly with temporal frequency !

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3.1 Birth of spiral waves: the effect of sigmoidal slope (lambda ) and firing threshold (theta ). The beginning of the result section examines the potential effect of sigmoidal steepness around its defined threshold. In the mathematical description of chemical synapses, the response saturation speed is modeled by sigmoid S-curve slope …

Spiral waves are an interesting spatiotemporal pattern found in a variety of biological and chemical excitable systems. The existence of spiral waves and their …

(Color online) Spiral waves competition patterns of W(x, y)'s real part, of a heterogeneous 2D CGLE system with coexistence of multiple spiral waves after the competition.The red arrows indicate the propagation direction of the waves, the blue dots show the numerical results of frequency distributions at (y=100, xin [1,400]).All the …

Time Dependent Reaction Diffuison: spiral wave; Wave Equation: double slit domain; Saddle point solver for the stationary Stokes problem. Monolithic solver (Lagrange and DG formulation) Taylor-Hood formulation. Bercovier-Engelmann Testcase; DG formulation. Bercovier-Engelmann Testcase; Convergence rate check; Stokes problem with fieldsplit ...