Abstract: Disclosed are a step-by-step paired and up-down reciprocating combined fishway and a fish passage method thereof, belonging to the technical field of fish passage facilities. The present disclosure aims to provide an efficient fish passage technology for a low-head water control project, which overcomes the defects of long construction length and low fish passage efficiency of the traditional fishway. The present disclosure includes several fishway units, a mechanical transmission system, a fish repelling system, a control system, and a recovery cableway. Under the combined action of the mechanical transmission system and the fish repelling system, the fishway units reciprocate up and down step by step to form a fish passage way. The weight of the fishway units is balanced through the rotation of coaxial eccentric wheels, and the energy consumption of the mechanical transmission system is reduced.

Abstract: An aluminum borate whisker reinforced and toughened non-metallic matrix composite is provided, which specifically includes a non-metallic material reinforced and toughened with aluminum borate whiskers. The composite exhibits a higher bending strength and fracture toughness and a higher wear resistance. A method for preparing the composite is also provided. The method includes mixing the aluminum borate whiskers and the non-metallic material to form a mixture; and sintering the mixture by a vacuum hot press method, or molding the mixture.

Abstract: A surgical operation monitoring method applied to a surgical operation monitoring system comprises: acquiring a position of a surgical site of a surgical object at a first moment; under the condition that the position of the surgical site at the first moment exceeds a moving range of an actuating end of a mechanical arm, determining an allowable moving range of the surgical site at the first moment; and under the condition that the allowable moving range of the surgical site at the first moment and a moving range of the actuating end of the mechanical arm have an overlapping range, controlling a driver to drive a support body to move so that the support body drives the surgical site to move into the overlapping range.

Abstract: An aluminum borate whisker reinforced and toughened non-metallic matrix composite is provided, which specifically includes a non-metallic material reinforced and toughened with aluminum borate whiskers. The composite exhibits a higher bending strength and fracture toughness and a higher wear resistance. A method for preparing the composite is also provided. The method includes mixing the aluminum borate whiskers and the non-metallic material to form a mixture; and sintering the mixture by a vacuum hot press method, or molding the mixture.

Abstract: Aspects of the disclosure provide a semiconductor device. The semiconductor device can include a trench formed in a first dielectric layer, a trench filler layer that fills a portion of the trench, a conductive layer over the trench filler layer, and a second dielectric layer over the conductive layer. The second dielectric layer is disposed in the trench. The semiconductor device can also include a contact structure configured to connect to the conductive layer through a hole in the second dielectric layer.

Abstract: A surgical operation monitoring method applied to a surgical operation monitoring system comprises: acquiring a position of a surgical site of a surgical object at a first moment; under the condition that the position of the surgical site at the first moment exceeds a moving range of an actuating end of a mechanical arm, determining an allowable moving range of the surgical site at the first moment; and under the condition that the allowable moving range of the surgical site at the first moment and a moving range of the actuating end of the mechanical arm have an overlapping range, controlling a driver to drive a support body to move so that the support body drives the surgical site to move into the overlapping range.