Abstract: A self-cleaning maintenance station and a self-cleaning system are provided. The self-cleaning maintenance station includes a self-cleaning maintenance station body that includes a water storage chamber and a water storage tank assembled at a top end of the self-cleaning maintenance station body, where the water storage chamber bas a semi-enclosed structure, and the water storage chamber, with an opening facing upward and forward, is disposed at a top of the self-cleaning maintenance station body and is configured to accommodate the water storage tank; and the water storage tank, after being at least partially inserted into the water storage chamber, is assembled at the top end of the self-cleaning maintenance station body.

Abstract: A device base includes a housing having a first opening penetrating the housing; a first water tank; a water pump within the housing; a water passage opening on the housing; a first water pipe connecting the water passage opening with the water pump; a second water pipe connecting the water pump with the first water tank; a first infrared module within the housing, with its signal terminal facing the first opening and configured to transmit or receive an infrared signal that indicates a position of the device base or of a cleaning robot connected with the device base, to assist the device base in docking with the cleaning robot; and a first positioning member on the housing, configured to limit the cleaning robot when the device base is docked with the cleaning robot, and make a water injection port of the cleaning robot keep docked with the water passage opening.

Abstract: A filtering element, a dust collection pile, and a cleaning system are disclosed. The filtering element includes a frame and a filter screen. The filter screen id disposed on the frame. A receiving groove is formed on the filter screen. The receiving groove includes a first opening, a second opening, and a third opening, wherein the first opening and the second opening are provided opposite to each other, and both ends of the third opening penetrate through the first opening and the second opening.

Abstract: A fan assembly is described, including a housing, a fan, and a flexible member located between two ends of the fan and the housing. The fan is fixed within the housing by the flexible member, and the flexible member is configured to avoid a direct contact between the fan and the housing.

Abstract: Disclosed are a carbon nanotube (CNT)-based three-dimensional ordered macroporous (3DOM) carbon material and a preparation method thereof.

Abstract: One aspect of the invention provides a method of generating ultraviolet radiation. The method includes: introducing a mixture of nitrogen gas and helium gas into a dielectric barrier discharge device including a high voltage electrode and a ground electrode separated by a gap and a dielectric; and applying suitable electricity to the high voltage electrode, thereby generating ultraviolet radiation. Another aspect of the invention provides a plasma- and ultraviolet-generating nozzle including: a dielectric barrier discharge device; and a controller programmed to control flows of gas into the dielectric barrier discharge device and application of suitable electricity to the dielectric barrier discharge device to selectively generate either plasma or ultraviolet radiation. Another aspect of the invention provides a printing system including: a motion control system; and the plasma- and ultraviolet-generating nozzle as described herein coupled to the motion control system.