For the generation of nano-second width pulse, a design is developed by using MOSFET switch. The results of simulation and circuit experiment show the feasibility of the design.

There's a transmitter that sends the information to a receiver, one that's either clipped onto an iPod nano or built into the second-generation iPod touch.

Nano-TiO_2 photocatalyst can photocatalytically oxidize most of pollutants, especially volatile organic compounds (VOCs) under UV light illumination without second pollution.