Abstract: A hydroelectric power generation device and a power generation method based on an axial-flow hydraulic turbine are provided. The hydroelectric power generation device includes a water delivery pipeline. A power generation mechanism is mounted on and is connected to the water delivery pipeline. The power generation mechanism includes a hydraulic pump housing, an axial-flow impeller assembly and a generator. The hydraulic pump housing is mounted on and is connected to the water delivery pipeline. The axial-flow impeller assembly is rotatably mounted inside the hydraulic pump housing, and the generator is securely mounted on one side of an outside of the hydraulic pump housing and is drivingly connected with the axial-flow impeller assembly. The axial-flow impeller assembly includes a rotor, multiple vanes, that are circumferentially distributed, are mounted on an outer peripheral surface of the rotor. A power generation drive shaft is securely mounted at one end of the rotor.

Abstract: A train movement authorization method includes obtaining, by a train, current task information from an automatic train supervision system; obtaining, by the train, current resource allocation information from a trackside resource management center; reckoning, by the train, a first train in an operation direction downstream of the train based on the received resource allocation information; sending, by the train, a location request to the first train in the operation direction downstream of the train based on an operation task of the train and responding to a location request of another train; calculating, by the train, movement authorization of the train based on train information sent by the first train downstream in the operation direction; and applying for, by the train, a corresponding line resource from the trackside resource management center based on the task of the train and a status of the calculated movement authorization.

Abstract: The present invention relates to a train movement authorization method based on vehicle-to-vehicle cooperation.

Abstract: A power tool having a depth adjustment mechanism includes a motor housing, a support base for supporting the motor housing, and a depth adjustment member coupled to the support base and movable between two positions. The depth adjustment member in a first position contacts a surface portion of the motor housing and in a second position is distanced from the surface portion of the motor housing such that the movement of the depth adjustment member from the first position to the second position is in a direction parallel to a plane that is substantially tangent to the surface portion of the motor housing.

Abstract: A power tool having a depth adjustment mechanism includes a motor housing, a support base for supporting the motor housing, and a depth adjustment member coupled to the support base and movable between two positions. The depth adjustment member in a first position contacts a surface portion of the motor housing and in a second position is distanced from the surface portion of the motor housing such that the movement of the depth adjustment member from the first position to the second position is in a direction parallel to a plane that is substantially tangent to the surface portion of the motor housing.