spiral waves processing

spiral waves processing

Termination of spiral waves during cardiac fibrillation ...

Mar 29, 2005· Multiple unstable spiral waves rotating around phase singularities (PSs) in the heart, i.e., ventricular fibrillation (VF), is the leading cause of death in the industrialized world. Spiral waves are ubiquitous in nature and have been extensively studied by physiologists, mathematicians, chemists, and biologists, with particular emphasis on their movement and …

20 Perfect Ways to Get Beach Waves in Your Hair {2020 Update}

The perfect waves for short hair are bouncy and fun. Get this beach wave hair with curling iron (the large barrel one), using it on the top layers of the hair. Next, you'll want to break up the curls and tease the top and back of the hair to create volume. A great tutorial for 3 different wavy hairstyles for short hair:

Spiral waves of spreading depression in the isolated ...

Spiral SD waves were elicited in 31 retinal preparations and lasted for 4.5 cycles on the average. Average cycle duration was 4.7 min. Spontaneous spiral SD waves were observed in preparations incubated in Mg 2+ ‐free media. The spiral SD waves in retina are compared with mathematical models of analogous phenomena. It is argued that spiral SD ...

Detecting Parkinson's Disease with OpenCV, Computer Vision ...

Apr 29, 2019· Drawing spirals and waves to detect Parkinson's disease Figure 2: A 2017 study by Zham et al. concluded that it is possible to detect Parkinson's by asking the patient to draw a spiral while tracking the speed of pen movement and pressure. No image processing was conducted in …

Unpinning of Spiral Waves | SpringerLink

Abstract. Spiral waves are propagating self-organized structures commonly found in excitable media. Spiral waves of electrical excitation in cardiac systems connect to some arrhythmias, such as tachycardia and fibrillations, potentially leading to sudden cardiac death so that they should be eliminated.

Freezer technology making waves in the Arctic

UK manufacturer Starfrost previously installed a spiral freezer for Leroy Seafood more than 18 years ago who once again turned to the company when demand for its fish fillet products increased. The newly installed Helix spiral freezer has a 50% larger belt area and has been designed to operate with the same fan power, resulting in a significant ...

Curvature and spiral geometr iyn aggregation patterns of ...

computerized image processing, spiral wave patterns. Introduction The slime mould, Dictyostelium discoideum, which shows waves of aggregation movement during the early stage of its development cycle, is an important biologi-cal model system for the analysis of pattern formation

Spiral Waves in Disinhibited Mammalian Neocortex | Journal ...

Nov 03, 2004· Spiral waves are a basic feature of excitable systems. Although such waves have been observed in a variety of biological systems, they have not been observed in the mammalian cortex during neuronal activity. Here, we report stable rotating spiral waves in rat neocortical slices visualized by voltage-sensitive dye imaging. Tissue from the occipital cortex (visual) was …

Spiral gravity waves radiating from tropical cyclones ...

Beyond this radius the spiral waves are decoupled from convection and are not affected by moist saturation. A radius‐time Hovmöller diagram, constructed from model data along a line radiating due South from the vortex center (Figure 2b), ... 4.1 Buoy Data and Processing.

Formation of spiral wave in Hodgkin-Huxley neuron networks ...

Apr 01, 2020· At first we turn to Fig. 3, which shows how the waves are affected by the synaptic noise.When the synaptic input is absent, namely d I s y n (t) = 0, as shown in the upper panels of Fig. 3, the initial bar-shaped pattern firstly induces two spiral rotators in a very small area of the center of the lattice, and then two wave fronts are generated in the opposite directions and finally collide ...

Navigating underwater using spiral sound

Nov 17, 2010· The research team developed ways to produce sound with another type of wave front, a spiral wave front, where, instead of concentric circles, there is one continuous spiral …

Spiral Perm vs Regular Perm: Spiral Perm Hairstyles and Tips

May 20, 2020· Spiral Perm vs Regular Perm. Styling tools like straighteners and curling irons make it easier to switch up your hair's texture from day to day. But if you're tired of putting waves into straight hair or dealing with an irregular curl pattern on a regular basis, you might be searching for a more long-term solution to your hair woes.

Acid Wave Perm | What is an Acid Perm | Acid vs Alkaline ...

This question might be raised a lot of times by cautious minds that need to know all the information before they do anything to their hair. Low pH Acid waves need heat to speed up processing. Considering that hair has a pH of around 5.0, acid waves prove to be less damaging to the hair, produce loose curls and are accompanied by a dryer for heat.You would want to opt for acid waves for ...

Demonstration of spiral wave front sonar for active ...

Dec 31, 2019· Spiral wave front sonar is a non-imaging, active sonar technique for remote target localization. It operates by transmitting a reference signal and a spiral signal whose phase varies by 2 π over the transducer's azimuthal plane. Range is given by time-of-flight, and azimuthal aspect by computing the phase difference between reference and spiral echoes across a …

5 Best Hair Perm Kits - Oct. 2020 - BestReviews

Often referred to as home perms, permanent waves, or just perms, these products make it possible to transform stick-straight hair into waves and curls with lots of body that will last for months. It's the combination of rolling sections of hair around perm rods and processing them chemically that creates the long-lasting changes to straight hair.

Texture & Wave | John Robert's Spa

Spiral Texture Wave – $125* A full-head perm; wrapped in a spiral technique giving the look of long spiral curls through out the hair. KERATIN SMOOTHING TREATMENTS. At John Robert's, we offer the Coppola Keratin Complex® Smoothing Treatment. Best for frizzy, curly, and sensitive hair the Keratin protein can reduce or enhance curl, remove ...

Formation of spiral wave in Hodgkin-Huxley neuron networks ...

Apr 01, 2020· At first we turn to Fig. 3, which shows how the waves are affected by the synaptic noise.When the synaptic input is absent, namely d I s y n (t) = 0, as shown in the upper panels of Fig. 3, the initial bar-shaped pattern firstly induces two spiral rotators in a very small area of the center of the lattice, and then two wave fronts are generated in the opposite directions and …

Trigonometry Primer Processing.org

Processing is a flexible software sketchbook and a language for learning how to code within the context of the visual arts. Since 2001, Processing has promoted software literacy within the visual arts and visual literacy within technology.

Circles, Spirals and Sunflowers - KrazyDad

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 Processing.js, I employ these equations in a loop, to draw each point on the circle, like so:

Demonstration of spiral wave front sonar for active ...

Dec 31, 2019· Spiral wave front sonar is a non-imaging, active sonar technique for remote target localization. It operates by transmitting a reference signal and a spiral signal whose phase varies by 2 π over the transducer's azimuthal plane. Range is given by time-of-flight, and azimuthal aspect by computing the phase difference between reference and spiral echoes across a range of frequencies …

(PDF) Rotating Spiral Waves Created by Geometry

Spiral waves represent an important example of dissipative structures observed in many distributed systems in chemistry, biology and physics. ... Trails of neutral red-stained prestalk and ...

Chapter 20-2: Permanent Waving Flashcards | Quizlet

-mixing oxidizer with waving solution causes rapid release of heat, speeding up processing time-all contain permanent waving solution, activator and neutralizer-contains thio, like cold waves-activator has oxidizing agent (hydrogen peroxide) that must be added to solution immediately before use

Termination of spiral waves during cardiac fibrillation ...

Termination of spiral waves during cardiac fibrillation via shock-induced phase resetting Richard A. Gray*† and Nipon Chattipakorn‡§ Departments of *Biomedical Engineering and ‡Medicine, University of Alabama at Birmingham, Birmingham, AL 35294 Edited by Harry L. Swinney, University of Texas, Austin, TX, and approved February 22, 2005 (received for review October …

Spiral Waves in Integrate-and-Fire Neural Networks

spiral waves for E = 0.58 with periodic central point stimulation (simulations, in some cases, ran up to 50,000 generations). However, for all 20 networks, spiral waves could be obtained by the use of non-uniform initial conditions. Moreover, for those networks in which spiral waves occurred, the generation at which they formed differed.

Spiral Wave [PC engine] | eBay

Spiral Wave [PC engine] [ Condition ] Used.Good [ Brand ] Naguzatto [ Release Date(yyyy/mm/dd) ] [ Note : Pre-Order (P/O) ] If title has "Pre-Order", we will ship out as soon as released. We want all buyers to understand there is possibility that the manufacturer will change contents, date and quantity for sale. Shrink dirt a little.

Detecting Parkinson's Disease with OpenCV, Computer Vision ...

Apr 29, 2019· Drawing spirals and waves to detect Parkinson's disease Figure 2: A 2017 study by Zham et al. concluded that it is possible to detect Parkinson's by asking the patient to draw a spiral while tracking the speed of pen movement and pressure. No image processing was conducted in this study. (image source)

Simulation of spiral wave superseding in the Luo–Rudy ...

Mar 01, 2019· A spiral wave is a vortex that rotates at an abnormally high frequency. It causes dangerous cardiac arrhythmias, such as paroxysmal tachycardia or fibrillation. In some cases, spiral waves can disappear spontaneously, and the arrhythmia stops by itself. However, if this does not occur, urgent medical intervention is necessary.

Teaching cardiac electrophysiology modeling to ...

Spiral waves are clinically associated with tachycardia, when the waves remain stable, and with fibrillation, when the waves exhibit breakup. All in silico experiments were conducted by simulating a mathematical model of cardiac cells on graphics processing units instead of the standard central processing units of desktop computers.

Spiral density waves in a young protoplanetary disk | Science

Sep 30, 2016· Spiral density waves are expected to be excited in the midplane of protoplanetary disks by the action of gravitational forces, generated by, for example, planet-disk interactions or gravitational instabilities ().These waves give rise to a spiral structure whose observable characteristics—the number and location of arms and their amplitudes and pitch angles—depend on the driving mechanism ...

Spiral Waves in Disinhibited Mammalian Neocortex | Journal ...

Nov 03, 2004· Spiral waves are a basic feature of excitable systems. Although such waves have been observed in a variety of biological systems, they have not been observed in the mammalian cortex during neuronal activity. Here, we report stable rotating spiral waves in rat neocortical slices visualized by voltage-sensitive dye imaging. Tissue from the occipital cortex (visual) was sectioned parallel to ...