Abstract: A resistive memory apparatus including a memory cell array, at least one dummy transistor and a control circuit is provided. The memory cell array includes a plurality of memory cells. Each of the memory cells includes a resistive switching element. The dummy transistor is electrically isolated from the resistive switching element. The control circuit is coupled to the memory cell array and the dummy transistor. The control circuit is configured to provide a first bit line voltage, a source line voltage and a word line voltage to the dummy transistor to drive the dummy transistor to output a saturation current. The control circuit is further configured to determine a value of a second bit line voltage for driving the memory cells according to the saturation current. In addition, an operating method and a memory cell array of the resistive memory apparatus are also provided.

Abstract: A threaded fastening assembly composed of a bolt, a nut, a fixing pin, and a positioning piece is revealed. The bolt includes at least one first groove arranged axially on a cylindrical surface of a shank and at least one first threaded segment. The nut has at least one second groove disposed axially on an inner cylindrical surface thereof and at least one second threaded segment. The first and second grooves are aligned to form a locking space for mounting the fixing pin. The positioning piece has a first side with two ends connected to a second side and a third side correspondingly. Inner edges of the second side and the third side are facing and extending toward each other to form convex portions which are matched with the first grooves. The fixing pin is mounted in the locking space for fastening the bolt and the nut.

Abstract: A concrete floor leveling device includes a transmission device and a power source is located in a body and connected to wheels which are connected to the body. A connection unit is connected to the body and a blade is connected to the body by the connection unit. The power source outputs a stable power to drive the blade to level the concrete floor and to ensure that the blade levels the concrete floor with even force.

Abstract: A concrete floor leveling device includes a transmission device and a power source is located in a body and connected to wheels which are connected to the body. A connection unit is connected to the body and a blade is connected to the body by the connection unit. The power source outputs a stable power to drive the blade to level the concrete floor and to ensure that the blade levels the concrete floor with even force.