http://en.wikipedia.org/wiki/Magnetic_refrigeration
Conversion between AC and DC
Speed control device
Object substance
Electrostatic separation
http://en.wikipedia.org/wiki/Ferrofluid
http://en.wikipedia.org/wiki/Pulse_wave
Standing assistance
User's state analysis
User information
Gradient material
Steel
Electrochemicals
Nanocarbon gel
Temperature distribution measurement
http://en.wikipedia.org/wiki/Pulse-code_modulation
Rehab system
http://en.wikipedia.org/wiki/Nuclear_reactor_coolant
http://en.wikipedia.org/wiki/Superconducting_magnet
