Abstract: An electrochemical measurement apparatus includes: a tank containing electrolytic solution and a sample that generates or consumes measurement target substances in the electrolytic solution; a plurality of uniformly mixed working electrodes; and a counter electrode; the apparatus adapted to simultaneously apply a voltage between each of the working electrodes and the counter electrode; and the apparatus configured to measure a current that flows between each of the working electrodes and the counter electrode; wherein any two working electrode groups are mutually different in at least any of the determined voltage, presence/absence of a molecular modification of an electrode surface, and a species of the molecular modification; and whereby a distribution in measurement area of the currents that flow through the working electrodes is acquired.

Abstract: An air intake sound control structure comprises a sound guiding pipe, a sound producing body, and a silencing means. The sound guiding pipe is branched off from a branch portion formed on a part of an air intake flow passage of an automobile, communicating with the air intake flow passage. The sound producing body is held by the sound guiding pipe at the position spaced apart from the branch portion, thereby sealing the sound guiding pipe, and producing a sound at a frequency which corresponds to its own natural vibration frequency by its vibration. The silencing means is disposed on the side of the branch portion of the sound guiding pipe and canceling a sound at a target frequency for suppression out of the air intake sound. The sound generated by the vibration of the sound producing body is transmitted into a vehicle interior.

Abstract: A vehicle ventilation duct includes a duct body, a conduit, a sound absorption chamber, a transmission opening communicating the conduit with the sound absorption chamber, and an air-permeable member closing the transmission opening permeably. The duct body is disposed in a vehicle outer hull, and includes a frame having a ventilation opening opened to the outside of a vehicle and a valve element covering the ventilation opening openably and closably. The conduit is formed integrally with or independently of the duct body, is disposed on a vehicle-passenger-room side of the duct body, is communicated with the ventilation opening of the duct body, and is communicated with the inside of a vehicle passenger room, whereby enabling air inside and outside the vehicle to pass therethrough back and forth. Thus, the ventilation duct lets out air in the vehicle passenger room to the outside of the vehicle or vice versa.

Abstract: A noise absorbing structure for effectively absorbing noise in a wide frequency range includes a first noise absorbing portion that is hollow and includes one or more first holes. The structure further includes a second noise absorbing portion that is hollow and includes one or more second holes. The total area of the one or more first holes differs from the total area of the one or more second holes.

Abstract: A vehicle ventilation duct includes a duct body, a conduit, a sound absorption chamber, a transmission opening communicating the conduit with the sound absorption chamber, and an air-permeable member closing the transmission opening permeably. The duct body is disposed in a vehicle outer hull, and includes a frame having a ventilation opening opened to the outside of a vehicle and a valve element covering the ventilation opening openably and closably. The conduit is formed integrally with or independently of the duct body, is disposed on a vehicle-passenger-room side of the duct body, is communicated with the ventilation opening of the duct body, and is communicated with the inside of a vehicle passenger room, whereby enabling air inside and outside the vehicle to pass therethrough back and forth. Thus, the ventilation duct lets out air in the vehicle passenger room to the outside of the vehicle or vice versa.

Abstract: A wheel cap is detachably joined to a disc wheel and having air discharge openings formed in the outer periphery thereof. The wheel cap has a plurality of radial fins provided for the reverse side of the wheel cap and formed from the wheel cap center toward the outside. Further, the wheel cap has an annular air suction opening, and a center plate disposed more adjacent to the center thereof as compared with the air suction opening. The inner distance between the innermost wall of the air suction opening and the center of the wheel cap is shorter than securing distance between a hub nut for securing the disc wheel to an axle hub and the center of the disc wheel.

Abstract: A wheel cap is detachably joined to a disc wheel and having air discharge openings formed in the outer periphery thereof. The wheel cap has a plurality of radial fins provided for the reverse side of the wheel cap and formed from the wheel cap center toward the outside. Further, the wheel cap has an annular air suction opening, and a center plate disposed more adjacent to the center thereof as compared with the air suction opening. The inner distance between the innermost wall of the air suction opening and the center of the wheel cap is shorter than securing distance between a hub nut for securing the disc wheel to an axle hub and the center of the disc wheel.

Abstract: A wheel cap is detachably joined to a disc wheel and having air discharge openings formed in the outer periphery thereof. The wheel cap has a plurality of radial fins provided for the reverse side of the wheel cap and formed from the wheel cap center toward the outside. Further, the wheel cap has an annular air suction opening, and a center plate disposed more adjacent to the center thereof as compared with the air suction opening. The inner distance between the innermost wall of the air suction opening and the center of the wheel cap is shorter than securing distance between a hub nut for securing the disc wheel to an axle hub and the center of the disc wheel.