News tagged with electrical conductivity
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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 and is available under the GNU Free Documentation License.
EPFL researchers develop a tool for oncologists using the electrical signature of cancer cells to get just the right treatment dosage for each patient.
Cancer Mar 04, 2013 | 2 / 5 (2) | 0
(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 ...
Neuroscience Nov 11, 2012 | 4.8 / 5 (6) | 0 |
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.
Genetics Dec 27, 2011 | 5 / 5 (3) | 0 |
Researchers from the Universities of Leeds, Edinburgh and Dundee have shed new light on the way that the brain protects itself from harm when 'running on empty.'
Neuroscience Oct 17, 2011 | 4 / 5 (6) | 1 |
In a breakthrough, researchers at the International Center for Materials Nanoarchitectonics (MANA, Japan) demonstrate for the first time the key features in the neuroscience and psychology of memory by a AgS2 synapse. ...
Medical research Sep 15, 2011 | 5 / 5 (1) | 0
(Medical Xpress) -- Abnormalities in cardiac conduction, the rate at which the heart conducts electrical impulses to contract and relax, are a major cause of death and disability around the world. Researchers at Columbia ...
Medical research May 09, 2011 | not rated yet | 0 |