Abstract: Group III-nitride-based light-emitting devices are provided. The light-emitting devices are characterized by an active region having one or more quantum wells. The one or more quantum wells having a double well design provided by a first well layer comprising an AlInGaN alloy or an InGaN alloy and an adjacent GaN interlayer, both of which are disposed between two barrier layers comprising an AlGaN alloy or a low-In-content AlInGaN alloy.

Abstract: A magnetic suspension bogie, the bogie comprising a upper frame located at the upper portion, two lower frames located at the lower portion, a suspension device and a track sensing device, wherein the upper frame and the lower frames are hinged and connected by means of a connecting device. By means of using a bearing hinge structure to connect the upper frame and the lower frames, it is not necessary to specially provide a separate steering mechanism; thus, a plurality of functions are comprised, while the structure is at the same time simplified. The present invention also relates to is a magnetic suspension train.

Abstract: A magnetic suspension bogie, the bogie comprising a upper frame located at the upper portion, two lower frames located at the lower portion, a suspension device and a track sensing device, wherein the upper frame and the lower frames are hinged and connected by means of a connecting device. By means of using a bearing hinge structure to connect the upper frame and the lower frames, it is not necessary to specially provide a separate steering mechanism; thus, a plurality of functions are comprised, while the structure is at the same time simplified. The present invention also relates to is a magnetic suspension train.