Abstract: An impeller is provided, including a metal housing, a shaft, and a plastic member. The metal housing has a shaft mounting hole. The inner surface of the shaft mounting hole includes three or more contact points, and the contact points are closer to the shaft than other portions of the inner surface of the shaft mounting hole. The shaft passes through the shaft mounting hole and is affixed by the contact points. The metal housing divides the shaft into an upper section, a middle section, and a lower section. The plastic member passes through the shaft mounting hole and is in contact with the middle section.

Abstract: A semiconductor device includes a plurality of channel layers vertically separated from one another. The semiconductor device also includes an active gate structure comprising a lower portion and an upper portion. The lower portion wraps around each of the plurality of channel layers. The semiconductor device further includes a gate spacer extending along a sidewall of the upper portion of the active gate structure. The gate spacer has a bottom surface. Moreover, a dummy gate dielectric layer is disposed between the gate spacer and a topmost channel layer of plurality of channel layers. The dummy gate dielectric layer is in contact with a top surface of the topmost channel layer, the bottom surface of the gate spacer, and the sidewall of the gate structure.

Abstract: The present invention relates to a rear screen three-dimension interactive system for a virtual reality. The rear screen three-dimension interactive system for a virtual reality includes a computing device; a display device electrically connected with the computing device, facing toward a user, and showing a three-dimension image for an article to the user; an image sensor electrically connected with the computing device, situated at a front side in front of the display device, keeping a second distance from the display device, and sensing a vision movement made by the user who is situated in the front side; and a motion sensor electrically connected with the computing device, situated at a rear side in back of the display device, keeping a first distance from the display device, and sensing a hand based action made by the user in the rear side.