Abstract: A concentration sensor 36 is disposed behind a wheel 22, and for sensing salinity concentration of water bounced up by the wheel 22. A front nozzle 34 is disposed ahead the wheel 22, and for sprinkling water toward an area of the road surface on which the wheel 22 is to pass. A rear nozzle 35 is disposed between the wheel 22 and the front nozzle 34, and for sprinkling water toward the wheel.

Abstract: A radio communication apparatus for performing radio communication with an other radio communication apparatus, the radio communication apparatus including: a control unit which determines an encoding rate, a modulation scheme, and data volume for each of a plurality of transmission data transmitted to the other radio communication apparatus based on an error detection result received from the other radio communication apparatus; and a transmission unit which respectively transmits the plurality of transmission data to the other radio communication apparatus based on the determined encoding rate, modulation scheme, and data volume.

Abstract: In a wireless communication device to be an access point, a transmitting cycle value of cyclic notifying information transmitted to a wireless communication device connected thereto is selected from a previously prepared setting value group and is set as a transmitting cycle, the cyclic notifying information is transmitted in the transmitting cycle corresponding to the transmitting cycle value selected by each wireless communication device independently and at random in a manner that the cyclic notifying information is transmitted in accordance with the set cycle by a wireless communication to thereby avoid the collision of cyclic notifying information transmitted from different wireless communication devices stochastically.

Abstract: A isotopic gas of high purity is obtained at low cost, wherein for example, in a case of separating 13CH4 from methane gas and obtaining 13CH4 of high purity, the enrichment of 13CH4, using the difference in adsorption of 12CH4 and 13CH4 onto an adsorbing material, is performed up to a certain concentration, and thereafter, 13CH4 is enriched by a separation method by distillation that uses the difference in boiling point.

Abstract: A process for manufacturing a precast composite structure of a matrix of cured carbon fiber reinforced concrete and at least one ferrous metallic member at least partly buried in said matrix, by forming an insulating layer of an electric resistance of at least about 100 ohms at least on that surface of the ferrous metallic member, which will otherwise be brought in contact with a concrete mix, placing the metallic member in position in a mold, pouring into the mold a concrete mix containing 0.2 to 10% by volume of carbon fiber so that said metallic member may be at least partly buried in said concrete mix, partly curing the structure until it becomes self-supporting, de-molding the partly cured structure, and fully curing the structure in an autoclave at a temperature between 100.degree. C. and 215.degree. C.