PROBLEM TO BE SOLVED: To provide a luminaire that includes a filter cover for illumination capable of preventing occurrence of a heat crack due to an environmental temperature and peeling or deterioration of a coating with the heat crack, and capable ...
A light guide device (30) includes a light guide (3) that has a light reflective side (31) and a light exit side (32). The light reflective side (31) has first reflective segments (311) and second reflective segments (312). The first reflective segmen...
The invention provides a denitrification rate measuring method and a measuring device for an engine. A first zirconia NOx sensor which can detect NOx concentration between an engine and a catalytic denitrification device in an exhaust gas path, and a ...