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Wearable Device Generates Electricity From Walking Knee Movements
Zothecula writes "If you've ever worn a knee brace, then you may have noticed what a large change in angle your knee goes through with every step you take, and how quickly it does so. A team of scientists from the U.K.'s Cranfield University, University of Liverpool and University of Salford certainly noticed, and decided that all that movement should be put to use. The result is a wearable piezoelectric device that converts knee movement into electricity, which could in turn be used to power gadgets such as heart rate monitors, pedometers and accelerometers."
Finally, a way to power our future borg implants.
Except that we already had this technology in 2008. And /. user Promatrax161 called out the idea in 2005. But then he may have adapted it from a shoe based version in 2001.
Sweat cools because the phase transition from liquid to vapor absorbs a lot of energy to break the bonds. This energy is provided by the skin, so as a result, the skin gets cooler. Likewise, if you condense the vapor back into a liquid, the exact same amount of energy is released again. If that condensation happens inside the suit, the suit will get warm, defeating the purpose of sweating in the first place. It would be like running in the desert in a raincoat.