Abstract: There are provided, for example, a reducing agent that can be used in a chemical looping method, a method of producing a gas using such a reducing agent and a method of increasing conversion efficiency, through which the efficiency of converting carbon dioxide into carbon monoxide is high. The reducing agent of the present invention is a reducing agent that produces valuables containing carbon by reducing carbon dioxide, including a granular support having a plurality of pores and an angle of repose of 45° or more and an oxygen carrier which is supported on the support and has oxygen ion conductivity. In addition, in the reducing agent of the present invention, the support preferably has an average pore size of 0.1 nm or more.

Abstract: The radio-wave transparent cover includes a plastic transparent layer, a decorative layer provided on the rear-side surface of the transparent layer, and a plastic base layer provided on the rear-side surface of the decorative layer. The transparent layer has a peripheral part having a protrusion extending rearward. The protrusion defines a peripheral edge of the transparent layer. The protrusion has an inner circumferential surface forming a part of an engaging end projecting rearward from the protrusion. The decorative layer is provided in a region of the rear-side surface of the transparent layer adjoining the inner circumferential surface of the engaging end.

Abstract: The radio-wave transparent cover includes a plastic transparent layer, a decorative layer provided on the rear-side surface of the transparent layer, and a plastic base layer provided on the rear-side surface of the decorative layer. The transparent layer has a peripheral part having a protrusion extending rearward. The protrusion defines a peripheral edge of the transparent layer. The protrusion has an inner circumferential surface forming a part of an engaging end projecting rearward from the protrusion. The decorative layer is provided in a region of the rear-side surface of the transparent layer adjoining the inner circumferential surface of the engaging end.

Abstract: The optical glass for press molding of the present invention contains 35 to 45% by weight of SiO2, 15 to 30% by weight of B2O3, and 18 to 33% by weight of CaO so that the total amount is 75 to 96% by weight. Also, the glass has an index of refraction (nd) of 1.55 to 1.63, an optical constant value ranging from 55 to 63 by the Abbe number (?d), a specific gravity of not more than 2.75, and a glass transition temperature (Tg) of not more than 550° C. According to the present invention, it is possible to provide inexpensive optical glass for press molding which exerts intended optical performance while realizing further reduction in size and weight of optical devices.