Abstract: A liquid cooling device includes first cold plates, second cold plates, a water divider, a first inlet pipe, a first outlet pipe, first connection pipes, second inlet pipes, second outlet pipes, second connection pipes. The water divider has inner inlet connectors and inner outlet connectors. The first inlet pipe connects one inner inlet connector and one first cold plate. The first outlet pipe connects one inner outlet connector and another one first cold plate. The first connection pipes each connect different two of the other first cold plates. The second inlet pipes respectively connect the other inner inlet connectors and some second cold plates. The second outlet pipes respectively connect the other inner outlet connectors and some second cold plates. The second connection pipes each connect different two second cold plates.

Abstract: An automatic spraying unmanned aerial vehicle (UAV) system based on dynamic adjustment of early warning range and a method thereof are disclosed. In the automatic spraying UAV system, an unmanned aerial vehicle analyzes a forward direction and a forward speed of a staff appearing in an environment video, calculates a preset distance, and generates an early-warning range by extending outwardly a spraying range by a preset distance; when determining the staff appears within the early-warning range in the environment video, the unmanned aerial vehicle pauses an automatic spraying operation, so as to achieve the technical effect of improving safety of the staff in an operation area by dynamically adjusting the early-warning range of the automatic spraying operation of the unmanned aerial vehicle.

Abstract: A server casing includes a case body, a HDD cage and a backplane assembly. The case body has an opening and an accommodation space connected to the opening. The HDD cage can be inserted into and removed from the accommodation space through the opening. The HDD cage has installation spaces for accommodating the hard disk drives. The backplane assembly includes a connector and a HDD backplane fastened to the HDD cage and configured to be electrically connected to the hard disk drives. The HDD cage further has a front surface and a rear surface. The front surface is closer to the opening than the rear surface. The installation spaces are between the front surface and the rear surface. The HDD backplane extends beyond the rear surface in a direction away from the opening. The connector is located at one end of the HDD backplane extending beyond the rear surface.