Abstract: There are provided a hydrogen production apparatus and a hydrogen producing method that can easily bring the temperature of a gas to be supplied to a preferential oxidation catalyst bed to a proper range without the necessity of flow rate control of a cooling medium, and a fuel cell system which is relatively inexpensive and can easily realize stable operation.

Abstract: There are provided a hydrogen production apparatus and a hydrogen producing method that can easily bring the temperature of a gas to be supplied to a preferential oxidation catalyst bed to a proper range without the necessity of flow rate control of a cooling medium, and a fuel cell s stem which is relatively inexpensive and can easily realize stable operation.

Abstract: Proton-exchange membrane fuel-cell power generating equipment includes a heat exchanger coupled to a process burner and, therethrough, to a fan. When water needs to be heated, such as during startup, the water is circulated through the heat exchanger and the process burner is operated (ignited) to heat the water. When the water needs to be cooled, such as when a hot water reserving tank is full, the water is circulated through the heat exchanger and the fan is operated, but the process burner is not operated, to cool the water. Water is circulated through part or all of a water system to prevent freezing while the system is stopped. Optionally, the process burner is operated to heat the circulated water. The heat exchanger and other heat exchangers in the system are arranged to efficiently recover heat from burners, a fuel-cell cooling system and exothermic processes.

Abstract: The present invention provides a proton-exchange membrane fuel cell power generating equipment that keeps temperature of coolant of a fuel cell in a predetermined temperature range without stop operation of the equipment even when a hot water reserving tank is filled with hot water and the hot water is not discharged to the outside, automatically prevents freezing of a water system during stop operation of the equipment, minimizes maintenance work in a cold region or in the winter season, has high reliability with equipment's service life extended, and supplies hot water heated by efficiently recovering exhaust heat from plural heat exchangers installed in the equipment to the hot water reserving tank. The power generating equipment has a line for circulating and feeding hot water A produced by exchanging heat in the heat exchanger connected to a process gas burner for burning hydrogen until the equipment becomes stable in starting operation.

Abstract: An assignment server which receives access from a browser installed in a user terminal includes a terminal attribute specifying element for specifying an attribute of the user terminal from which access is made (or a country to which the user terminal belongs), and an assignment element for changing a destination to which the browser is to be connected to a conversion server corresponding to the attribute of the user terminal. The conversion server holds therein a conversion table produced in corresponding relation to the attribute of the user terminal and containing an identification number and a Web page address of Web content associated with each other. On receipt of a search request designating the identification number, the conversion server sends a response designating the corresponding Web page address. Thus, desired Web content is displayed in the browser.

Abstract: An assignment server receiving access from a browser installed in a mobile telephone has a browser specifying clement specifying the type of browser and an assignment element changing the connection destination of the browser to a conversion server. The conversion server has a conversion table associating an identification number with a web content page address accessable from the browser. On receipt of a retrieval request designating the identification number, the conversion server sends a response designating the corresponding page address, so that the desired web content is displayed on the browser.