Abstract: A silica-alumina powder, a method for producing the same, and a fluid catalytic cracking catalyst including this silica-alumina powder are provided. The silica-alumina powder contains SiO2 within a predetermined range, has a specific surface area within a predetermined range, and has a pore volume and an acid amount within predetermined ranges. An alumina raw material includes one of boehmite, pseudo-boehmite, and mainly amorphous alumina gel. The method for producing the silica-alumina powder includes a step of mixing an aqueous solution including alumina hydrate and an aqueous solution containing a silica precursor to prepare an aqueous solution including a silica-alumina precursor; a step of adjusting the pH of the aqueous solution to be within a predetermined range, and then heat-treating the aqueous solution; and a step of cooling the aqueous solution or silica-alumina slurry, then separating and washing a solid, and then drying or further calcining the solid.

Abstract: A photoelectric sensor includes a lens mounted to a light projecting element at a position that opposes a light projecting lens and configured such that the curvature in the direction perpendicular to a straight line passing through the center of the light projecting lens and the center of the light receiving lens is greater than the curvature in the direction parallel to the straight line passing through the center of the light projecting lens and the center of the light receiving lens.

Abstract: A photoelectric sensor includes a lens mounted to a light projecting element at a position that opposes a light projecting lens and configured such that the curvature in the direction perpendicular to a straight line passing through the center of the light projecting lens and the center of the light receiving lens is greater than the curvature in the direction parallel to the straight line passing through the center of the light projecting lens and the center of the light receiving lens.