Abstract: The present disclosure provides a method for photo-curing 4D printing of a multi-layer structure with an adjustable shape recovery speed, and a multi-layer structure printed thereby. The multi-layer structure printed by the method for photo-curing 4D printing of the multi-layer structure with the adjustable shape recovery speed includes a plurality of deformation units sequentially connected in series, and each of the plurality of the deformation units includes two slow layers, a fast layer, and a transition layer; and the fast layer is arranged between the two slow layers, and the transition layer is arranged between at least one of the two slow layers and the fast layer. In the present disclosure, a low cross-linking layer is doped with a nanocarbon light-absorbing material to solve the problem that the low cross-linking layer is prone to over-curing when a high cross-linking layer is printed on the low cross-linking layer.

Abstract: This application provides a radio frequency circuit and an electronic device. The radio frequency circuit includes: a first amplifier, a first switch, a first frequency band transceiver unit, a second frequency band transceiver unit, and an antenna, where the first switch includes a first movable end, a first non-movable end, and a second non-movable end, where an input end of the first amplifier is connected to a radio frequency transceiver, an output end of the first amplifier is connected to the first movable end, the first non-movable end is connected to one end of the first frequency band transceiver unit, the second non-movable end is connected to one end of the second frequency band transceiver unit, and the other end the first frequency band transceiver unit and the other end of the second frequency band transceiver unit are both connected to the antenna.

Abstract: A method, apparatus and device for dynamically acquiring the load of a vehicle, and a storage medium are disclosed. The method includes: acquiring deformation data of load-bearing deformation of a wheel hub of the vehicle, and acquiring the load of the vehicle according to the deformation data.

Abstract: The present application provides a wheel rotation imaging device and a wheel rotation imaging intelligent advertising system. In the wheel rotation imaging device, power can be supplied by means of rotation of a wheel with the use of a self-powered unit, so an external power supply is not required; texts, images and videos can be displayed; in addition, a variety of sensors are integrated to acquire operation information of the device in real time, which facilitates the wheel rotation imaging device to adjust the imaging angle and brightness.

Abstract: The present disclosure discloses a deformation sensor and device for measuring the load of a wheel hub of a vehicle, and an automobile. The deformation sensor includes: a metal lining fixed on the surface of the wheel hub, and a resistance strain gauge fixed on the metal lining. The resistance strain gauge is fixed on the metal lining through a structural adhesive.

Abstract: A method for monitoring an automobile based on a satellite, and a vehicle-mounted computer are provided. The method includes: acquiring first information of the automobile; sending the first information to the satellite through a satellite data transfer unit (DTU); and receiving and displaying second information from a cloud monitoring platform.

Abstract: A display method for a wheel rotation imaging device includes: acquiring operation information, the operation information comprising ambient light intensity, wheel speed, vehicle acceleration, current time, current location, and current power; identifying a situational mode of vehicle driving according to the operation information, the situational mode being in one-to-one correspondence with a power consumption mode; and selecting a power consumption mode of the wheel rotation imaging device according to the situational mode, so that the wheel rotation imaging device completes display according to the power consumption mode. The wheel rotation imaging device is mounted on a wheel and can display texts, images or videos as the wheel rotates.

Abstract: A method, apparatus and device for dynamically acquiring the load of a vehicle, and a storage medium are disclosed. The method includes: acquiring deformation data of load-bearing deformation of a wheel hub of the vehicle, and acquiring the load of the vehicle according to the deformation data.

Abstract: A method, device and apparatus for dynamically monitoring the working state of a vehicle, and a storage medium are disclosed. The method includes: waking up a monitoring unit according to a vehicle starting signal, acquiring the load of the vehicle, the tire pressure of a wheel and the temperature of a wheel hub through the monitoring unit, and determining the working state of the vehicle according to the load of the vehicle, the tire pressure of the wheel and the temperature of the wheel hub.

Abstract: The present disclosure discloses a deformation sensor and device for measuring the load of a wheel hub of a vehicle, and an automobile. The deformation sensor includes: a metal lining fixed on the surface of the wheel hub, and a resistance strain gauge fixed on the metal lining The resistance strain gauge is fixed on the metal lining through a structural adhesive.

Abstract: A display method for a wheel rotation imaging device includes: acquiring operation information, the operation information comprising ambient light intensity, wheel speed, vehicle acceleration, current time, current location, and current power; identifying a situational mode of vehicle driving according to the operation information, the situational mode being in one-to-one correspondence with a power consumption mode; and selecting a power consumption mode of the wheel rotation imaging device according to the situational mode, so that the wheel rotation imaging device completes display according to the power consumption mode. The wheel rotation imaging device is mounted on a wheel and can display texts, images or videos as the wheel rotates.

Abstract: The present application provides a wheel rotation imaging device and a wheel rotation imaging intelligent advertising system. In the wheel rotation imaging device, power can be supplied by means of rotation of a wheel with the use of a self-powered unit, so an external power supply is not required; texts, images and videos can be displayed; in addition, a variety of sensors are integrated to acquire operation information of the device in real time, which facilitates the wheel rotation imaging device to adjust the imaging angle and brightness.

Abstract: The present invention provides a drum of a wheel tester, which is characterized in that an outer surface of the drum has cyclic corrugations parallel to a cross section of the drum, wherein the cyclic corrugation in one cycle on the outer surface is composed of a concave arc and a convex arc, both of which are tangential in ends and equal in diameter, and one cycle is 30 to 50 mm in length and 1 to 1.5 mm in depth. The drum is easy to machine, reduced in cost, increased in friction force and suitable for simulating various road surfaces.

Abstract: The present invention provides a drum of a wheel tester, which is characterized in that an outer surface of the drum has cyclic corrugations parallel to a cross section of the drum, wherein the cyclic corrugation in one cycle on the outer surface is composed of a concave arc and a convex arc, both of which are tangential in ends and equal in diameter, and one cycle is 30 to 50 mm in length and 1 to 1.5 mm in depth. The drum is easy to machine, reduced in cost, increased in friction force and suitable for simulating various road surfaces.