Energy & Green Tech
North Carolina State University engineers have demonstrated a flexible device that harvests the heat energy from the human body to monitor health. The device surpasses all other flexible harvesters that use body heat as the ...
Jan 30, 2020
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84
Robotics
Robots used to be restricted to heavy lifting or fine detail work in factories. Now Boston Dynamics' nimble four-legged robot, Spot, is available for companies to lease to carry out various real-world jobs, a sign of just ...
Nov 7, 2019
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15
Robotics
Origami robots can be formed by tightly integrating multiple functions of actuation, sensing and communication. But the task is challenging as conventional materials including plastics and paper used for such robotic designs ...
Engineering
Engineers at the University of California San Diego have developed a wearable patch that could provide personalized cooling and heating at home, work, or on the go. The soft, stretchy patch cools or warms a user's skin to ...
May 17, 2019
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464
Electronics & Semiconductors
How do you pack more power into an electric car?
Aug 28, 2018
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383
Engineering
Electronic devices that can not only be implanted in the human body but also completely dissolve on their own – known as "bioresorbable" electronics – are envisioned by many as one of medical technology's next frontiers. ...
May 16, 2017
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15
Energy & Green Tech
Researchers at the University of California, Riverside have created a new silicon-tin nanocomposite anode that could lead to lithium-ion batteries that can be charged and discharged more times before they reach the end of ...
Aug 3, 2016
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309
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
