Abstract: The present invention provides an ohmic heating-type exhaust gas purification catalyst system. The ohmic heating-type exhaust gas purification catalyst system is configured to perform, based on information of temperature of a catalyst bed input from a temperature detector of an ohmic heating-type exhaust gas purification device, electric current pass control including controls of (1) causing an electric current to pass through a pair of electrodes when the temperature of the catalyst bed is equal to or lower than a first threshold temperature T1 set in a range of 350±25° C., (2) not causing an electric current to pass through the pair of electrodes when the temperature of the catalyst bed exceeds the first threshold temperature T1 and is equal to or lower than a second threshold temperature T2 set in a range of 450±25° C.

Abstract: A fused polycyclic aromatic compound represented by formula (1) is provided. In formula (1), one of R1 and R2 is a substituent group represented by general formula (2). In formula (2), n is from 0 to 2, R3 and R4 each independently represent a divalent linking group obtained by removing two hydrogen atoms from an aromatic hydrocarbon compound or a divalent linking group obtained by removing two hydrogen atoms from a 6-membered or more heterocyclic compound containing a nitrogen atom, an oxygen atom or a sulfur atom, with a plurality of R4 groups able to be the same as or different from each other when n is 2, and R5 represents a residue obtained by removing one hydrogen atom from an aromatic hydrocarbon compound or a residue obtained by removing one hydrogen atom from a 6-membered or more heterocyclic compound containing a nitrogen atom, an oxygen atom or a sulfur atom.

Abstract: The present invention includes a fused polycyclic aromatic compound represented by general formula (1), where in formula (1), one among R1 and R2 is represented by general formula (2) and represents a substituent having three to five ring structures, and the other among R1 and R2 represents a hydrogen atom, where in formula (2), n represents an integer of 0-2R. —R3 represents a divalent linking group obtained by removing two hydrogen atoms from benzene or naphthalene, R4 represents a divalent linking group obtained by removing two hydrogen atoms from an aromatic ring of an aromatic hydrocarbon, and when n is 2, a plurality of R4's may be the same as or different from each other, R5 represents an aromatic hydrocarbon group.

Abstract: When the density (DO) of the inclusions whose major axis exceeds 5 ?m observed in the axis position of a section perpendicular to the axial direction of a forged product is made 70 nos/cm2 or below and the radius of the forged product is made R, the ratio of the density (DR) of the inclusions whose major axis exceeds 5 ?m observed in the R/3 position from the axis position toward the radial direction and the density DO satisfies an inequality (1) below. 0.5?DR/DO?1.

Abstract: When the density (DO) of the inclusions whose major axis exceeds 5 ?m observed in the axis position of a section perpendicular to the axial direction of a forged product is made 70 nos/cm2 or below and the radius of the forged product is made R, the ratio of the density (DR) of the inclusions whose major axis exceeds 5 ?m observed in the R/3 position from the axis position toward the radial direction and the density DO satisfies an inequality (1) below. 0.5?DR/DO?1.