Abstract: The present invention provides a fuel cell optimum operating point tracking system capable of ensuring optimum operation of a fuel cell, by detecting the optimum operation voltage of the fuel cell taking not only temperature dependence of the output characteristics thereof, but also chemical reactions into consideration.

Abstract: The present invention provides a fuel cell optimum operating point tracking system capable of ensuring optimum operation of a fuel cell, by detecting the optimum operation voltage of the fuel cell taking not only temperature dependence of the output characteristics thereof, but also chemical reactions into consideration.

Abstract: The invention relates to a simplified thermostatic apparatus for an electronic apparatus and its control method achieving thermostatic formation of an electronic apparatus and constituting an object by preventing a deterioration in accuracy by a change in a surrounding temperature, and a highly heat-insulating vessel (1) provided with a radiator (2) capable of making a heat resistance variable is provided with a fan (4) for circulating a gas at inside of the vessel (1), temperature detecting means (7) for detecting a temperature at inside of the vessel (1) and heat resistance controlling means (3) for controlling the heat resistance of the radiator (2) in accordance with an output of the temperature detecting means (7).

Abstract: A recording method for an opto-magnetic disk apparatus by which pit edge recording of an opto-magnetic disk can be achieved and the track recording density is enhanced. The recording method is applied to an opto-magnetic disk apparatus wherein a light emitting element is driven with a pulse signal to form pits on a record face of a disk and a magnetic field is applied to such pit portions to modulate the pits. According to the method, the amount of information to be included in a pit modulated is made equal to or greater than 2 bits, and the period of the pulse signal to drive the light emitting element is changed in response to a bit or bits for a fraction to be recorded.