Abstract: There is provided a method or a device for recovering oil economically and with little impact on the environment. With the present invention's method and device for recovering oil, a heat-generating means is installed inside one of at least two pipes that are parallelly inserted into the soil (for example, an oil sand stratum or a core stratum). The heat is exerted on the oil contained in the soil so as to reduce the viscosity of oil, which is then recovered via the other pipe. The heat-generating means reacts amphoteric metal or its alloy with an alkaline aqueous solution in the pipe and then combusts the hydrogen generated by the reaction.

Abstract: The present invention provides a high-performance, high-capacity secondary battery that uses neither sulfuric acid in the electrolyte solution, nor other materials that could contribute to environmental pollution. The present invention also provides a vehicle system employing a lead-free battery that uses no lead nor sulfuric acid, which can be harmful to the environment, and that achieves a higher performance and higher capacity that lead storage batteries. Further, the vehicle system includes a supplementary charging function for charging the battery while the vehicle is running, by taking advantage of the fast-charging characteristics of the lead-free battery, which are superior to those of lead storage batteries, enabling the vehicle to travel long distances on a single external charge. The secondary battery has an electrode formed of calcium, silver oxide, and carbon as the anode, an electrode formed of zinc and carbon as the cathode, and an aqueous alkaline solution as the electrolyte solution.

Abstract: The system comprises a solid high polymer fuel cell to which hydrogen gas generated by a hydrogen generator 11 by electrolyzing the demineralized water is provided. A cell stack 30 includes a flowmeter 14, a hot air nozzle 15, a spray nozzle 16, a water sensor 17, temperature sensors 18, gas concentration sensors 19, a water tank 21, a pump 20, a hydrogen supply pipe 23, an oxygen supply pipe 24, a pair of take-off electrodes 25, and an amplifier 26 so that the operation of load 27 can be optimized by a power controller 10 based on signals from each sensor.