Nissan Motor Company Limited

Tohoku Metal Industries

Akira Matsunaga

Ryoichi Shimoi

Takashi Fukuda

Takahiro Fujii

Hayato Chikugo

Kazuo Saito

Mitsunori Kumada

Kazuhiro Kageyama

Yoshitaka Ono

Takashi Iimori

Hitoshi Igarashi

Yasuo Ishii

Naozumi Nishimura

A fuel cell system which prevents the deterioration of the fuel cell stack when feeding of the oxidant gas is paused under a load to perform a fuel conservation operation. Controller shuts down oxidant gas compressor and cooling water circulating pump to execute fuel conservation operation at a low fuel cell system load. The controller gives a current draw instruction to electric power controller. In the fuel conservation operation, electric power controller draws a current larger than zero from fuel cell stack, and keeps the total charge drawn per unit time constant or substantially constant.

Fuel cell system and method for operating the same

At shutdown of a fuel cell system, a system-shutdown controller is configured to cause a current extraction device to extract current from a fuel cell in a state where a supply of a fuel gas through a fuel supply system is continued and a supply of an oxidant gas through an oxidant supply system is stopped, and the system-shutdown controller is configured to airtightly close fresh-air control valves after increasing pressure of the fuel gas in a fuel electrode to not less than atmospheric pressure and not less than pressure of the oxidant gas in an oxidant electrode.

Fuel cell system and shutdown method of the same

An explosive having a relatively small amount of powdered ferrite magnet dispersed therethrough, each magnet particle coated with a resin coating which is stable for the explosive material on the entire outer surface thereof. The resultant explosive is readily detected by a magnetic detector and is stable for a long time storage. As the resin coating, methyl methacrylate resin, styrene resin, acrylonitril resin, butadiene resin, vinyl acetate resin, acrylic acid resin, methylacrylate resin and/or the other vinyl resin is used. The resin coating is colored to color the explosives so that explosives may be distinctly visible, readily detected and identified.

Explosives having powdered ferrite magnet as a tracer dispersed

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Yokohama, Japan

Akira Matsunaga