Trash Energy

"Trash will move from being a liability to an asset, providing a clean source of energy that can be used right where it is produced," says Stuart Haber, the company's CEO.



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IST Energy

AfriGadget

“This is basically a dynamo which is being driven as a result of friction between the ground and the blocks. The small yellowish blocks (these are covered by rubber in the real commercial product) rotate as you pull it. They are designed to rotate even on bumpy run even roads. We have tested it on moist lawn and have worked. It is very smooth so much that you basically don’t feel any disturbance as you move along.

At normal walking speeds we have gotten more than 2 watts which is more than enough for running cell phones or radios. I envision that people will attach this to themselves and walk with it - or even attach it to an ox-cart, a skating board, bike, etc.” Dr. Cedrick Ngalande, the inventor.

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Laser to Light to Electricity

Photonic Power Systems Inc. has developed a system that uses a laser to inject power in the form of light into a fiber-optic cable and a photovoltaic (PV) array to convert the light back into electricity for powering devices. This method of transferring power has advantages in situations where sparks or shorts can be a fatal problem, where electromagnetic interference is more than just an inconvenience—in cellphone base stations, for example, or in pacemakers—and where conventional methods are bulky and cumbersome.

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Shock absorber developed to harvest energy

By harvesting the energy wasted by ordinary shock absorbers, a prototype device aims to take over much of the work now performed by alternators.

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Turning exhaust into energy

Research into thermoelectrics — the science of using temperature differences to create electricity — couldn't come at a better time.

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Intel's RF energy harvester

Intel set up a TV antenna on a balcony with line of sight to the KING-TV tower 4.1 km away. The TV station broadcasts on channel 48 between 674 and 680 MHz with an effective radiation power (ERP) of 960 Kw. The TV antenna used was a UHF log periodic with 5 dBi gain connected to a 4 stage charge pump power harvesting circuit of the same design as that found in an RFID tag. Across an 8 KOhm load the team measured 0.7V, corresponding to 60 microwatts of power harvested. That was enough to drive a thermometer/hygrometer and its LCD display, which is normally powered, by a 1.5 volt AAA battery.

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Technical papers here