A fuel cell, which has a tubular polymer electrolyte membrane, with a fuel electrode on one of inner and outer sides of the membrane, and with an air electrode on the other side of the membrane.

It is an object of the present invention to provide a proton-conducting membrane, excellent in resistance to heat, durability, dimensional stability and fuel barrier characteristics, and showing excellent proton conductivity at high temperature. It is anot...

There is provided a wireless-type power supply method for use when the object to which energy is to be transmitted is relatively small, such as a micromachine, and which allows high-voltage electrical energy to be transmitted without using a wire. In this ...