Abstract: A micro inverter, a photovoltaic system and a method for controlling a micro inverter are provided. The micro inverter includes a controller, a primary H-bridge, a transformer, a bi-directional switch arm and a capacitor arm. The controller is configured to: determine a reactive current based on a grid voltage, an equivalent capacitance of an output terminal of the inverter and a grid angle; add the reactive current to a given current to generate an internal phase-shift angle and an external phase-shift angle from a new given current obtained through the addition, where the internal phase-shift angle refers to a phase-shift angle between two arms of the primary H-bridge and the external phase-shift angle refers to a phase-shift angle between the primary H-bridge and the bi-directional switch arm.

Abstract: An end cover assembly, an air cylinder, a tread sweeper and a railway vehicle.

Abstract: A method of using a device for conducting a vascular hemodynamic bionic cell experiment is provided, the method comprises: firstly, experiment preparation; and secondly, experiment operation, namely, switching on a peristaltic pump, pumping a circulation liquid from a collection bottle into an independently corresponding shunting chamber of a corresponding shunting bottle through a collection bottle sampling tube of an independent chamber of a collection bottle, after shunting by the shunting chamber of the shunting bottle, the circulation liquid flowing out of a branch shunting tube flows to a corresponding flow chamber on the 1-3 flow chamber platforms placed side by side, and then converging the circulation liquid to a corresponding independent chamber of the collection bottle through respective sampling tubes of the flow chamber platforms.

Abstract: A method of using a device for conducting a vascular hemodynamic bionic cell experiment is provided, the method comprises: firstly, experiment preparation; and secondly, experiment operation, namely, switching on a peristaltic pump, pumping a circulation liquid from a collection bottle into an independently corresponding shunting chamber of a corresponding shunting bottle through a collection bottle sampling tube of an independent chamber of a collection bottle, after shunting by the shunting chamber of the shunting bottle, the circulation liquid flowing out of a branch shunting tube flows to a corresponding flow chamber on the 1-3 flow chamber platforms placed side by side, and then converging the circulation liquid to a corresponding independent chamber of the collection bottle through respective sampling tubes of the flow chamber platforms.