The Signal Processing, Imaging, Reasoning, and Learning (SPIRAL) Group is federation of labs in the Electrical and Computer Engineering Department of Northeastern lab comprises 6 faculty and more than 30 graduate students and postdocs, working in diverse research areas such as statistical signal processing, machine learning, distributed computing, and optimization.
The spiral waves can be initiated by two different cardiac pacing methods: (1) twopoint 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 Archimedean spiral (also known as the arithmetic spiral) is a spiral named after the 3rdcentury BC Greek mathematician Archimedes. It is the locus of points corresponding to the locations over time of a point moving away from a fixed point with a constant speed along a line that rotates with constant angular velocity .
Jan 03, 2014· If the slow source is a spiral wave and the shock structure reaches its core, the spiral wave turns into a wavebreak, translocating from one incoming wave to another. The location of the wavebreak changes with time, drifts. If the highfrequency source stops, the wavebreak develops into spiral wave at the new place. References
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Unlike the spiral features from scatteredlight observations, the spiral arms detected with our millimeterwave imaging trace structures at the midplane of the disk—where planet formation takes place—allowing us to discern the location, shape, contrast, and size of these spiral density waves at the disk midplane.
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sin(θ) will produce identical values for any two numbers which are 2π apart. The pattern produced by these functions are sine waves and cosine waves (cosine waves are basically sine waves which are out of phase by 90 degrees). In, I employ these .
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Stationary spiral waves in liquid film flowing over a spinning disk have been observed in earlier. experiments H. Espig and R. Hoyle, "Waves in a thin liquid layer on a rotating disk," J. Fluid. Mech. 22, 671 1965 ; A. F. Charwat et al., "The flow and stability of thin liquid films on a rotating. disk," ibid.
Spiral density waves in a young protoplanetary disk: Authors: ... We argue that the observed spirals trace shocks of spiral density waves in the midplane of this young disk. Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts:
In contrast to normal spiral waves the phase fronts of antispirals propagate toward the spiral core. The group velocity is positive for both antispirals and normal spirals, and consequently local perturbations of the wave propagate always away from the spiral core.
How atmospheric waves radiate out of hurricanes: Atmospheric gravity waves that spiral outward could be used to monitor storms. ScienceDaily . Retrieved February 20, 2019 from ...
spiral waves is studied by forcing the spiral tip to hit the bottom of the reactor, and the critical current density is called J term [19]. In order to control the temperature, the reactor is placed vertically in a transparent thermostating bath, which is located
Stable and quasiperiodically meandering spiral waves occurred when the slope of action potential duration (APD) restitution was <1 over all diastolic intervals visited during reentry; chaotic meander and spiral wave breakup occurred when the slope of APD restitution exceeded 1.
Spiral waves are generic to many excitable media, therefore the theory of spiral waves is well developed and also reviewed herein. Many of the predictions of spiral wave theory are being realized in the heart and leading investigators in new directions.
Nov 03, 2004· Spiral waves appeared to arise out of the interactions of waves (supplementary movie 4). Spiral waves were observed in 48% of trials (116 of 242 trials from 15 slices of 12 animals). Out of these 116 observations of spirals 66 had at least 4 rotations (57%), and 10 more than 10 rotations (9%).
