Abstract: The present disclosure provides a method for communal facilities management in a smart city based on an Internet of Things.

Abstract: A method for producing an abrasion-resistant coating on the inner wall of an aluminum alloy workpiece is provide. The steps include mixing a graphene powder and Al powder to obtain a mixed powder; combining and heating the mixed power with a polyvinyl alcohol (PVA) liquid, and performing spray granulation to obtain a low-temperature self-propagating composite; stirring a slurry comprising the low-temperature self-propagating composite and sodium silicate; injecting the slurry into a cylindrical inner cavity of an aluminum alloy workpiece mounted on a horizontal rotary table for rotation, the aluminum alloy workpiece is heated with the rotation at a second temperature of 80-100° C. so that the slurry is uniformly solidified on the cylindrical inner surface of the cylindrical inner cavity; and burning the slurry, after the slurry is uniformly solidified and while the rotation is maintained, with an oxyacetylene flame to form the wear-resistant coating.

Abstract: A time measurement method includes that a first device receives a first packet from a second device using a first antenna. The first device transmits a second packet to the second device using a second antenna. The first device receives an indication for a first transceiving delay from the second device, where the first transceiving delay is a delay from a time at which the second device transmits the first packet to a time at which the second device receives the second packet. The first device determines a round-trip time (RTT) between the first device and the second device based on a calibration delay from the second antenna to the first antenna, a recording moment at which the first device receives the first packet, a recording moment at which the first device transmits the second packet, and the first transceiving delay.

Abstract: A refrigerator includes a cabinet having an inner casing, an outer casing, and a thermal insulation space located between the inner casing and the outer casing and filled with a thermal insulation material, to form a pair of thermal insulation walls disposed opposite to each other. The thermal insulation walls have recesses formed in the inner casing and opened forward. A beam bridges the pair of thermal insulation walls, the beam including insert portions disposed on two ends and respectively inserted into the corresponding recesses. A first fixing mechanism is at least partially located in the recess and fixes the insert portion to the thermal insulation wall, which not only facilitates the assembly of the beam and improves production efficiency, but also is beneficial to improving a weight capacity of the beam.

Abstract: A time measurement method includes that a first device receives a first packet from a second device using a first antenna. The first device transmits a second packet to the second device using a second antenna. The first device receives an indication for a first transceiving delay from the second device, where the first transceiving delay is a delay from a time at which the second device transmits the first packet to a time at which the second device receives the second packet. The first device determines a round-trip time (RTT) between the first device and the second device based on a calibration delay from the second antenna to the first antenna, a recording moment at which the first device receives the first packet, a recording moment at which the first device transmits the second packet, and the first transceiving delay.

Abstract: A refrigerator includes a cabinet having an inner casing, an outer casing, and a thermal insulation space located between the inner casing and the outer casing and filled with a thermal insulation material, to form a pair of thermal insulation walls disposed opposite to each other. The thermal insulation walls have recesses formed in the inner casing and opened forward. A beam bridges the pair of thermal insulation walls, the beam including insert portions disposed on two ends and respectively inserted into the corresponding recesses. A first fixing mechanism is at least partially located in the recess and fixes the insert portion to the thermal insulation wall, which not only facilitates the assembly of the beam and improves production efficiency, but also is beneficial to improving a weight capacity of the beam.

Abstract: A refrigerator has a case body with a pair of side walls, a beam bridge-connecting the pair of side walls, where the beam includes a housing, and the housing has an accommodation space and a heat insulation material located in the accommodation space. A strengthening member is fastened to a corresponding side wall, where the strengthening member is mounted in the accommodation space, and includes a main plate portion extending along a front inner wall of the accommodation space and a side plate portion extending backward from at least one side of the main plate portion. The housing has a support portion protruding backward from the front inner wall, and the side plate portion is provided with an anti-flipping portion abutting against the support portion.

Abstract: A refrigerator has a case body with a pair of side walls, a beam bridge-connecting the pair of side walls, where the beam includes a housing, and the housing has an accommodation space and a heat insulation material located in the accommodation space. A strengthening member is fastened to a corresponding side wall, where the strengthening member is mounted in the accommodation space, and includes a main plate portion extending along a front inner wall of the accommodation space and a side plate portion extending backward from at least one side of the main plate portion. The housing has a support portion protruding backward from the front inner wall, and the side plate portion is provided with an anti-flipping portion abutting against the support portion.

Abstract: A digital field-induction water-level intelligent sensing system is provided. The digitalized intelligent field-induction field technology is utilized in the sensing system, thus the problem of water scale formation on the water-level sensors when applied in the severe environment and the problem of sensing system failure easily happening in the high temperature and high humidity environment are solved. The application of the field-induction technology enables the sensing system to detect the water level without electrical connection or mechanical connection, thus the problems of the sensor failure or inaccurate water-level detection caused by the water scale formation are avoided.