Abstract: A method, circuit, audio playback device, and system of sending and receiving Bluetooth packet loss data is disclosed. The method includes: step S100, receiving a forwarding request sent by a second audio playback device in a receiving state; step S200, monitoring the retransmission information of an audio source device retransmitting current audio data on Link 1 according to the forwarding request; step S300, determining whether the retransmission information is monitored; step S400, switching from the receiving state to a sending state; and step S500, forwarding the current audio data to the second audio playback device through Link 2 in accordance with the time sequence of the audio source device retransmitting the current audio data. The signal can be provided to the second audio playback device from different locations.

Abstract: A train having a protection device with self-adaptive crashworthiness is disclosed, which relates to the technical field of safety protection of trains. The train includes multiple vehicles, a head vehicle is located at the head end of the train, and a head vehicle energy absorbing coupler mechanism is mounted at the front end of the head vehicle, each two adjacent vehicles are connected to each other by a middle vehicle energy absorbing coupler mechanism. An image acquisition mechanism and a radar detector are mounted at the head vehicle for monitoring whether there is an obstacle ahead the train, measuring distance and collision speed between the train and the obstacle, and for transmitting measured data to a processing center of the train, the processing center optimizes and adjusts impact force at the head vehicle energy absorbing coupler mechanism and the middle vehicle energy absorbing coupler mechanisms based on a collision situation.

Abstract: A CMOS-MEMS humidity sensor, comprising: a complementary metal oxide semiconductor (CMOS) ASIC readout circuit and a microelectromechanical system (MEMS) humidity sensor. The MEMS humidity sensor is provided on the ASIC readout circuit. The ASIC readout circuit comprises: a substrate, a heating resistor layer, a metal layer, and dielectric layers, the heating resistor layer being located above the substrate, the metal layer being located above the heating resistor layer, and the substrate, the heating resistor layer, and the metal layer being partitioned by dielectric layers. The MEMS humidity sensor comprises: an aluminum electrode layer, a passivation layer, and a humidity sensitive layer, the passivation layer being located above the aluminum electrode layer, and the humidity sensitive layer being located above the passivation layer.

Abstract: A lens sealing sleeve includes a hollow cylindrical sleeve body used for a lens barrel to pass through and including a plurality of fold portions arranged along the axial direction, and two ends of the sleeve body are provided with a first opening and a second opening. The lens sealing sleeve also includes a first connection portion and a second connection portion. The first connection portion includes a first protrusion at least partially surrounding the first opening and correspondingly extending in a direction facing away from a central line of the first opening. The second connection portion includes a second protrusion at least partially surrounding the second opening and correspondingly extending in a direction facing away from a central line of the second opening. The first protrusion is provided with a first connection hole. The second protrusion is respectively provided with a second connection hole.

Abstract: A lens sealing sleeve includes a hollow cylindrical sleeve body used for a lens barrel to pass through and including a plurality of fold portions arranged along the axial direction, and two ends of the sleeve body are provided with a first opening and a second opening. The lens sealing sleeve also includes a first connection portion and a second connection portion. The first connection portion includes a first protrusion at least partially surrounding the first opening and correspondingly extending in a direction facing away from a central line of the first opening. The second connection portion includes a second protrusion at least partially surrounding the second opening and correspondingly extending in a direction facing away from a central line of the second opening. The first protrusion is provided with a first connection hole. The second protrusion is respectively provided with a second connection hole.