Abstract: There is provided an exhaust gas purification device that shows a high HC removal performance under a condition in which a rich air-fuel mixture is introduced. The exhaust gas purification device includes a substrate, a first catalyst layer, and a second catalyst layer. The substrate includes an upstream end and a downstream end. The first catalyst layer is disposed on a surface of the partition wall in an upstream region including the upstream end of the substrate. The second catalyst layer is disposed inside the partition wall in a downstream region including the downstream end of the substrate. The first catalyst layer contains a first metal catalyst and alumina-zirconia composite oxide. The second catalyst layer contains a second metal catalyst.

Abstract: A motor driving device, which controls a rotation number of a brushed motor by outputting a command signal to a motor controller placed in a current supply path, includes: a noise detecting unit including at least one of: a high voltage side noise detecting unit which detects high voltage side noise from brush noise included in the monitor voltage, based on whether a monitor voltage is larger than a first threshold voltage; and a low voltage side noise detecting unit which detects low voltage side noise from the brush noise included in the monitor voltage, based on whether the monitor voltage is smaller than a second threshold voltage; and a calculating unit which outputs the command signal to the motor controller to control the rotation number of the motor to reduce a occurrence number of the brush noise, based on at least one of the occurrence numbers.

Abstract: A motor driving device, which controls a rotation number of a brushed motor by outputting a command signal to a motor controller placed in a current supply path, includes: a noise detecting unit including at least one of: a high voltage side noise detecting unit which detects high voltage side noise from brush noise included in the monitor voltage, based on whether a monitor voltage is larger than a first threshold voltage; and a low voltage side noise detecting unit which detects low voltage side noise from the brush noise included in the monitor voltage, based on whether the monitor voltage is smaller than a second threshold voltage; and a calculating unit which outputs the command signal to the motor controller to control the rotation number of the motor to reduce a occurrence number of the brush noise, based on at least one of the occurrence numbers.

Abstract: A novel method for measuring airborne radon and thoron capable of separately measuring radon and thoron with high sensitivity, having a small-sized device structure, and free of the influence from its measurement environment. In the method, by measuring Cherenkov light generated when airborne radon and thoron are adsorbed to an absorbent and then ? rays emitted in process of disintegrations of radon and thoron pass through the absorbent, radon and thoron are measured. Based on a decay time of the Cherenkov light, a mixture ratio between radon and thoron is measured. As the absorbent, porous glass is preferably employed which is provided with fine pores of 0.3 to 30 nm in diameter.

Abstract: A novel method for measuring airborne radon and thoron capable of separately measuring radon and thoron with high sensitivity, having a small-sized device structure, and free of the influence from its measurement environment. In the method, by measuring Cherenkov light generated when airborne radon and thoron are adsorbed to an absorbent and then ? rays emitted in process of disintegrations of radon and thoron pass through the absorbent, radon and thoron are measured. Based on a decay time of the Cherenkov light, a mixture ratio between radon and thoron is measured. As the absorbent, porous glass is preferably employed which is provided with fine pores of 0.3 to 30 nm in diameter.