Abstract: The present disclosure provides a non-contact fatigue detection system and method based on rPPG. The system and method adopt multi-thread synchronous communication for real-time acquisition and processing of rPPG signal, enabling fatigue status detection. In this setup, the first thread handles real-time rPPG data capture, storage and concatenation, while the second thread conducts real-time analysis and fatigue detection of rPPG data. Through a combination of skin detection and LUV color space conversion, rPPG raw signal extraction is achieved, effectively eliminating interference from internal and external environmental facial noise; Subsequently, an adaptive multi-stage filtering process enhances the signal-to-noise ratio, and a multi-dimensional fusion CNN model ensures accurate detection of respiration and heart rate.

Abstract: Provided are an obstacle detection method and apparatus, a self-walking robot, and a storage medium. The obstacle detection method includes: upon reception of a triggered feedback instruction, providing an interactive interface to allow a user to submit feedback information, the feedback information including a related picture and type information of an obstacle contained in the picture; and after learning that submission by the user is completed, sending the feedback information to a server or notifying a bond self-walking robot to send the feedback information to the server.

Abstract: A lightweight smart hair-growing instrument with external power supply, which includes an headgear mechanism, light sources, a control mechanism, and a power source; the headgear mechanism is provided with a cavity for containing a user's head; the light sources are disposed in the cavity and faced to a centre of the cavity; the control mechanism are located at an outside of the headgear mechanism and electrically connected with the light sources; the power source is disposed in the control mechanism; the control mechanism and the light sources are connected electrically by a transmission line or driving connected by a wireless protocol signal; the power supply is integrated on the control mechanism independent with the headgear mechanism, which greatly reduces the whole heavy of the hair-growing instrument.

Abstract: A stable smart laser hair-growing instrument with independent light sources includes a shell, a laser emitting assembly and a control system; the shell is provided with a cavity disposed above a user's head, the laser emitting assembly includes light sources, a first circuit board and multiple second circuit boards, the first circuit board is disposed in the shell at a position aligned at a center of a user head; a gap is arranged between the adjacent second circuit boards; the light sources are evenly distributed on the first circuit board and those of the second circuit boards; the control system includes a circuit control and a multi-group of independent control units electrically connected with the circuit control; all the independent control units are electrically connected to the corresponding driving circuit of the second circuit boards and that of the first circuit board, respectively.

Abstract: The present application provides a positive electrode piece, a battery and an electric device. A first aspect of the present disclosure provides a positive electrode piece, the positive electrode piece includes a positive electrode current collector and a positive electrode active layer provided on at least one surface of the positive electrode current collector, and the positive electrode active layer includes a positive electrode active material; in a plane composed of a length direction and a thickness direction of the positive electrode piece, particles of the positive electrode active material have a longest distance a in the length direction of the positive electrode piece, and have a longest distance b in the thickness direction of the positive electrode piece, and in a region not less than 25 ?m*25 ?m, the number of the particles of the positive electrode active material meeting a/b?3 is N, where N?2.

Abstract: The present disclosure provides a positive electrode material, a battery and an electric device. A first aspect of the present disclosure provides a positive electrode material, the positive electrode material is Lin-xNaxCo1-yMeyO2, 0.7?n?1, 0<x?0.15, 0?y?0.15, and Me is selected from one or more of Al, Mg, Ti, Zr, Ni, Mn, Y, La, Sr, W, Sc, Ce, P, Nb, V, Ta, and Te; a X-ray diffraction pattern of the positive electrode material includes a peak 002 corresponding to a crystal plane 002, a peak 004 corresponding to a crystal plane 004, a peak 101 corresponding to a crystal plane 101, a peak 102 corresponding to a crystal plane 102, and a peak 103 corresponding to a crystal plane 103; a peak intensity ratio of the peak 101 to the peak 004 is m, wherein m?1.5.

Abstract: The disclosure relates to a light-curing 3D printer. The light-curing 3D printer includes a plurality of light-emitting sources which are uniformly arranged and simultaneously emit scattered lights; a grid plate which is located above the light-emitting sources, and has a vertical optical channel corresponding to a position right above one of the light-emitting sources which are located in the center of the optical channel which is surrounded by vertical and opaque side walls limiting the reflection of light; a lens which is located above a light-guiding member, and has a condensing lens unit formed corresponding to a position right above one of the optical channels; a liquid crystal display (LCD) transmitting screen which is located above the lens and has pixel lattices.

Abstract: A solid-state polymer lithium battery pack and a preparation method therefor are provided. The lithium battery pack includes: single batteries (1), connecting sleeve members (2), electric cables (3), a battery box (4) and a pouring sealant, and has functions of power supply, power storage and multiple charging/discharging. The preparation method includes: connecting a plurality of single batteries in series by means of connecting sleeve members (2) to form combined batteries; connecting a plurality of combined batteries in series to form a lithium battery pack; and finally, assembling the lithium battery pack into a battery box (4), filling a pouring sealant inside the battery box by means of a sealant pouring process for fixing the single batteries (1) and internal electric cables (3), and discharging air in the battery box (4), so that a final solid-state polymer lithium battery pack is obtained.