Abstract: An exploration method according to the present disclosure includes: a step (S11) of disposing, in a pipeline (PL) that allows a plurality of manholes (MH) to be interconnected, an electromagnetic wave receiving/transmitting device (1) that transmits an electromagnetic wave and receives a reflected electromagnetic wave that is a reflected wave of the electromagnetic wave; a step (S13) of transmitting the electromagnetic wave; a step (S14) of receiving the reflected electromagnetic wave that is the reflected wave of the electromagnetic wave; and a step (S18) of calculating an intensity distribution of the reflected electromagnetic wave on the basis of an intensity of the reflected electromagnetic wave and a round-trip propagation time from when the electromagnetic wave is transmitted to when the reflected electromagnetic wave is received.

Abstract: A light-emitting device is described that includes a plurality of partially drivable light sources, and a color conversion component configured to convert at least part of incident light from at least part of the light sources and emit outgoing light falling in a different wavelength region from the incident light, where the color conversion component includes a pyrromethene derivative.

Abstract: A measurement device (100) that measures an absolute coordinate of a target object (300) provided inside an excavation ditch (200) includes: a coordinate measurement unit (10) that measures a position coordinate of a reference point in a vertical direction from the target object (300); a distance measurement unit (20) that measures the vertical distance from the reference point to the target object; and a calculation unit (30) that calculates the absolute coordinate of the target object based on the vertical distance and the position coordinate.

Abstract: A protective member (1) for protecting the cables (9) includes an inclined steel material (3) having an inclined upper surface (S) to a horizontal surface (H) above the cable (9) and an outer pipe (7) which is a buried pipe for accommodating the cables (9) and the inclined steel material (3).