Abstract: A method for fabricating semiconductor devices includes forming channel regions over a substrate. The channel regions, in parallel with one another, extend along a first lateral direction. Each channel region includes at least a respective pair of epitaxial structures. The method includes forming a gate structure over the channel regions, wherein the gate structure extends along a second lateral direction. The method includes removing, through a first etching process, a portion of the gate structure that was disposed over a first one of the channel regions. The method includes removing, through a second etching process, a portion of the first channel region. The second etching process includes one silicon etching process and one silicon oxide deposition process. The method includes removing, through a third etching process controlled based on a pulse signal, a portion of the substrate that was disposed below the removed portion of the first channel region.

Abstract: A synchronous cutting mechanism for a pipe mill includes a carrying table having a sliding pedestal; a speed-adjustable driving set having a speed-adjustable power source, an axle coupled to a driving wheel of the speed-adjustable power source, and a link having one end pivotally connected to the driving wheel at an eccentric point on the driving wheel and an opposite end pivotally connected to the sliding pedestal; a pipe-clamping set for holding a to-be-cut pipe coming from the pipe mill; and a pipe-cutting set for cutting the to-be-cut pipe. When the driving wheel rotates, the link is driven to swing, thereby driving the carrying table and the pipe running out to move in the same direction and with the same velocity, so that the to-be-cut pipe can be cut according to a predetermined length.

Abstract: A surface grinder for a ball of a ball valve comprises a ball positioning device at an X axis for driving the ball to rotate about the X axis and a grinding device at a Z axis for driving a grindstone set to rotate about the Z axis, wherein the grindstone set grinds a spherical surface of the ball.

Abstract: A surface grinder for a ball of a ball valve comprises a ball positioning device at an X axis for driving the ball to rotate about the X axis and a grinding device at a Z axis for driving a grindstone set to rotate about the Z axis, wherein the grindstone set grinds a spherical surface of the ball.