Implantable neuromodulation devices such as deep brain stimulators and vagus nerve stimulators, are widely used to treat neurological diseases. Most devices are composed of rigid probes that limit spatial resolution and increase ...
As the number of complex heart operations has increased over the years, so have cases of postoperative heart block, a form of arrhythmia that often requires a pacemaker and more surgery. Heart block occurs when unseen conduction ...
Mar 8, 2024
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A study sets the foundation of a ground-breaking treatment regimen for treating ventricular arrhythmia. The research, published in Nature Communications, demonstrates the design and feasibility of a new hydrogel-based pacing ...
Jan 9, 2024
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For years, automotive companies have developed intelligent sensors to provide real-time monitoring of a vehicle's health, including engine oil pressure, tire pressure and air-fuel mixture. Together, these sensors can provide ...
Jun 23, 2022
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Noninvasive glucose monitoring devices are not currently commercially available in the United States, so people with diabetes must collect blood samples or use sensors embedded under the skin to measure their blood sugar ...
Oct 14, 2021
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Thin, flexible fibers made of carbon nanotubes have now proven able to bridge damaged heart tissues and deliver the electrical signals needed to keep those hearts beating.
Aug 13, 2019
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When it comes to sticking something into your brain, smaller is usually better.
Aug 7, 2017
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The presence or absence of the CAP2 gene causes sudden cardiac death in mice, according to new research from the Perelman School of Medicine at the University of Pennsylvania. In particular, the absence of the gene interrupts ...
Dec 14, 2015
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(Medical Xpress)—A thin, flexible electrode developed at the University of Michigan is 10 times smaller than the nearest competition and could make long-term measurements of neural activity practical at last.
Nov 11, 2012
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Arrhythmia is a potentially life-threatening problem with the rate or rhythm of the heartbeat, causing it to go too fast, too slow or to beat irregularly. Arrhythmia affects millions of people worldwide.
Dec 27, 2011
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Electrical conductivity or specific conductance is a measure of a material's ability to conduct an electric current. When an electrical potential difference is placed across a conductor, its movable charges flow, giving rise to an electric current. The conductivity σ is defined as the ratio of the current density to the electric field strength :
It is also possible to have materials in which the conductivity is anisotropic, in which case σ is a 3×3 matrix (or more technically a rank-2 tensor) which is generally symmetric.
Conductivity is the reciprocal (inverse) of electrical resistivity, ρ, and has the SI units of siemens per metre (S·m-1):
Electrical conductivity is commonly represented by the Greek letter σ, but κ (esp. in electrical engineering science) or γ are also occasionally used.
An EC meter is normally used to measure conductivity in a solution.
This text uses material from Wikipedia, licensed under CC BY-SA
