Abstract: A precast, prestressed concrete truss which spans between exterior columns and forms an interior or exterior load bearing wall of a building. The truss includes top and bottom chords interconnected by at least one web member. Prestressed reinforcing members in the top and bottom chords apply a compressive stress in the chords. The top and bottom chords are configured to support concrete planks that form a floor and/or a ceiling of a building in which the truss is used. When used as an interior load bearing wall, the truss can include at least one opening that forms, for example, a corridor passage large enough for a person to walk through the opening. When used as an exterior load bearing wall, the truss can include at least one window opening.

Abstract: A surface foreign matter inspection device is provided with which the NA can be enlarged with a simple configuration, and a shortening of the time required for foreign matter inspection as well as a high detection sensitivity can be achieved. The device is provided with an optical detection means 6 that irradiates light from an radiation optical system onto the surface of an object under inspection on a stage, reflects light scattered by foreign matter on the object under inspection and turns the reflected light into parallel light, condenses the parallel light with a condensing lens, and detects the condensed light, as well as an information processing device 100 for processing an electrical signal from the optical detection means 6 and position information regarding the foreign matter on the object under inspection 4.