Abstract: A ultraviolet detector includes a substrate; a first epitaxial layer that is a heavily doped epitaxial layer and located on the substrate, a second epitaxial layer located on the first epitaxial layer, where the second epitaxial layer is a lightly doped epitaxial layer, or a double-layer or multi-layer structure composed of at least one lightly doped epitaxial layer and at least one heavily doped epitaxial layer; an ohmic contact layer located on the second epitaxial layer or formed in the second epitaxial layer, where the ohmic contact layer is a graphical heavily doped layer; and a first metal electrode layer located on the ohmic contact layer.

Abstract: A stepping dimming motor structure is provided, including a shell, and further including: a winding frame, which is provided with a coil, wherein a wiring block is arranged on a side circumferential wall of the winding frame; two wiring slots are arranged on the wiring block; each wiring slot corresponds to a wiring tab; a magnetically-conductive ring frame. The above scheme generates a magnetic field by powering up the coil to excite the magnetically-conductive ring frame, thus driving the rotor assembly to rotate; the rotor assembly then drives the push rod to move axially, adjusting headlights; and meanwhile, a fastening effect on lead wire ends of the coil and electrical connection between the lead wire ends of the coil and the wiring tabs are achieved through plugging fit between the wiring tabs and the wiring slots, thereby ensuring the structural reliability and improving the assembling efficiency.

Abstract: A multi-layer coating system comprises a first and a second ultraviolet curable coating composition. The first ultraviolet curable coating composition comprises a low hydroxyl value polyurethane resin and a urethane acrylate oligomer. The second ultraviolet curable coating composition comprises a urethane acrylate oligomer and an active monomer. A method of coating a substrate with the multi-layer coating system and the substrate coated with the multi-layer coating system are also provided.

Abstract: A high-hardness anti-steel wool UV curable coating composition comprises a high-functionality UV curable polyurethane acrylate. A method of coating a substrate with the high-hardness anti-steel UV curable coating composition and the substrate coated with the same are also provided.

Abstract: The present invention provides a multi-layer coating system, comprising a first coating composition and a second coating composition, wherein the first coating composition comprises an acrylic resin (a) having a glass transformation temperature (Tg) of at least 70° C. and the second coating composition comprises a three-functionality polyester acrylate, a six-functionality polyurethane acrylate, and a nine-functionality polyurethane acrylate. The present invention further provides a method of coating a multi-layer coating system on a substrate and a substrate coated with the multi-layer coating system.