Abstract: The invention discloses a preferable short arc orbit determining method based on Gauss solution cluster, and belongs to the astrodynamics field, including: grouping the observation data, using Gauss method to obtain the target state vector at the corresponding time point for each group of data, forming a solution set of preliminary estimation; dividing the solution set of preliminary estimation into a position component vector solution set and a velocity component vector solution set for clustering to obtain a position component vector solution cluster and a velocity component vector solution cluster; based on the position component vector solution cluster and the velocity component vector solution cluster, generating a two-dimensional trajectory solution set; evaluating each of the two-dimensional trajectories by using a trajectory optimal method, calculating the number of root of orbits corresponding to the optimal two-dimensional trajectory, thereby completing determination of initial orbit.

Abstract: The present disclosure discloses a knee joint power generation device based on bidirectional ball screw drive, and belongs to the field of biomechanical energy harvesting. The power generation device converts the rotary motion of the knee joint during human movement into a linear motion of the rope by the rope driving device, and then converts the linear motion into a rotary motion through a bidirectional ball screw to directly act on the motor, thereby converting the human biological energy into electric energy in the whole process to achieve power generation. The power generation device of the disclosure can meet the requirements of normal power generation during high-speed running and low-speed walking, has long-term high-efficiency and stable performance, can be easily worn on different people, has light overall weight and costs less loss of human walking metabolism.

Abstract: The present invention discloses a multi-element perovskite material, and a single crystal, powder and a film thereof, as well as the applications thereof in photoluminescence and electroluminescence, in which the multi-element perovskite material is a multi-element fully-inorganic salt of non-lead metal halide and has a perovskite structure; and the chemical formula of the multi-element perovskite material is Cs2NaxAg1-xInyBi1-yCl6, wherein 0?x?1, 0?y?1. Meanwhile, based on the very strong self-trapped exciton states of the double perovskite, the present invention proposes a high-efficiency single-phase broadband phosphor and an electroluminescent device.

Abstract: The present invention is related to a storage system of scalable storage for in-memory objects using a DRAM-NVM hybrid memory devices.

Abstract: The present invention belongs to the technical field of liquid-cooling heat dissipation, wherein discloses a novel mechanical pump liquid-cooling heat dissipation system, comprising an external radiator, a circulating pipe and a mechanical pump, wherein the circulating pipe communicates the external radiator with the circulating pipe to form a circulation loop, the mechanical pump includes a volute in the form of a hollow cylinder, a fixing surface is formed at one end of the volute, the fixing surface is planar and is part of the outer surface of the volute, a layer of heat-conducting silicone grease is coated on the fixing surface, the fixing surface and a heat source are fixed through pressure lamination, and the heat-conducting silicone grease is attached to the fixing surface and the heat source; and the mechanical pump takes away heat of the heat source and transfers it to a cooling working medium while pumping the cooling working medium to circulate in the circulation loop.

Abstract: The present invention discloses a method and system for selecting an image region that facilitates blur kernel estimation, in which the method includes: calculating a relative total variation value of each pixel in a blurred image to obtain a relative total variation mapping image; setting a threshold value to determine whether respective pixel in the image is a boundary pixel or not; then sampling the blurred image and its relative total variation mapping image to obtain a series of image patches; and finally counting the number of boundary pixels in each mapping image patch and selecting out an image region that facilitates blur kernel estimation. According to the method and the system, the problems of excessive dependency on operator experience, low efficiency and the like in the existing region selection methods are effectively solved. The image region that facilitates blur kernel estimation is automatically selected out.

Abstract: A multi-modal field-programmable metamorphic sensor is provided. The metamorphic sensor has a multi-layer structure, including an upper electrode layer, a spacer layer, and a lower electrode layer. At least one of the upper electrode layer and the lower electrode layer is a sensor A. The spacer layer is disposed between the electrode layers. A sensor B is formed through forming a structure of electrode layer—spacer layer—electrode layer structure. When detecting an object, the measurement of different physical quantities of different objects is implemented through switching between the sensor A and the sensor B. The sensor serves as a single cell. Multiple single cells are combined to form a multi-cell sensor. A signal acquisition system for acquiring signal of the sensor is also provided.

Abstract: The disclosure discloses a skin-attached blood oxygen saturation detection system and a preparation method thereof. The system includes a front-end flexible blood oxygen saturation detection circuit and a back-end signal processing output module connected to each other. The front-end flexible blood oxygen saturation detection circuit uses a flexible packaging material to act as a packaging layer, a surface of the front-end flexible blood oxygen saturation detection circuit has an adhesive functional layer, and is configured to detect blood oxygen saturation of a human tissue through a reflective optical principle. The back-end signal processing output module is configured to transmit a blood oxygen saturation signal to a mobile terminal through a Bluetooth antenna transmission module.

Abstract: The present disclosure provides an encoding method and an encoder for a (n, n(n?1), n?1) permutation group code in a communication modulation system, in which 2k k-length binary information sequences are mapped to 2k n-length permutation codeword signal points in a n-dimensional modulation constellation ?n. The constellation ?n with the coset characteristics is formed by selecting 2k n-length permutation codewords from n(n?1) permutation codewords of a code set Pn,xi of the (n, n(n?1), n?1) permutation group code based on coset partition. The constellation ?n is a coset code in which 2k1 cosets are included and each coset includes 2k2 permutation codewords, where k=k1+k2, and 2k?n(n?1). The present disclosure utilizes the coset characteristics to realize one-to-one correspondence mapping of the binary information sequence set to the permutation code constellation, so that the time complexity of executing the encoder is at most the linear complexity of the code length n.

Abstract: The disclosure discloses a method for constructing actual processing curve of part with small curvature based on a point cloud boundary. The method includes: (a) encrypting a three-dimensional ordered boundary curve of a part to be processed; (b) fitting encrypted boundary points into a plane, and projecting each boundary point into the plane to obtain a projection point; (c) performing Euclidean cluster within the plane to obtain point sets, and fitting the obtained point sets into a straight line; (d) performing the Euclidean cluster on projection points that are not fitted into the straight line to obtain corner point sets, and fitting a sharp corner or a rounded corner of the corner point sets to obtain a fitted boundary curve within the plane; (e) mapping the fitted boundary curve to a curved surface of the three-dimensional ordered boundary curve to obtain an actual processing curve of the part to be processed.

Abstract: The disclosure discloses a method for extracting a boundary of a thin-walled part with small curvature based on three-dimensional point cloud. The method includes: collecting point cloud data of a part to reduce density of the point cloud data, performing Euclidean cluster to divide into point cloud pieces, obtaining triangular mesh surfaces for each point cloud triangulation; extracting a boundary vertex of each triangular mesh surface to obtain a contour thereof, selecting a contour of the part among all contours; searching with each point on the contour as a center to form a three-dimensional boundary point cloud band; projecting the three-dimensional boundary point cloud band to a plane, orderly extracting two-dimensional boundary points within the plane, and arranging corresponding points in the three-dimensional boundary point cloud band according to an order of ordered boundary points within the plane to obtain ordered boundary points in the three-dimensional boundary point cloud band.

Abstract: The present disclosure belongs to the field of 3D gaze point recognition and computer vision, and more particularly discloses a pose recognition method, device and system for an object of interest to human eyes, which respectively identifies centers of left and right pupils of a user by using a left eye camera and a right eye camera on an eye tracker to extract information of the user's eyes; maps the obtained centers of the left and right pupils to a left scene camera to obtain a 2D gaze point; extracts bounding boxes of objects in the left scene camera by using target recognition and tracking algorithms, and then determines an object of interest to the user according to a positional relationship between the 2D gaze point and the bounding boxes of the objects; performs 3D reconstruction and pose estimation of the object of interest to the user to obtain a pose of the object of interest in the left scene camera; and converts the pose of the object of interest in the left scene camera to a pose in the world co

Abstract: A laser stripping mass-transfer device includes a microdevice laser stripping transfer module, an auxiliary conveyor module, a transition conveyor module, a transfer conveyor module, a substrate carrier module, a microdevice filling module, a curing module, an encapsulation module and a substrate transportation module. The microdevice laser stripping transfer module is configured to implement detection and stripping of the microdevices. The auxiliary conveyor module is configured to adhere the stripped microdevices. The transition conveyor module is configured to pick up and transfer the microdevices to the transfer conveyor module. The transfer conveyor module is configured to pick up and transfer the microdevices to the substrate carrier module. The substrate carrier module is configured to feed the microdevices into the microdevice filling module, the curing module, the encapsulation module, and the substrate transportation module for filling, curing, encapsulating, loading and unloading.

Abstract: The present invention relates to an acceleration method for an FPGA-based distributed stream processing system, which accomplishes computational processing of stream processing operations through collaborative computing conducted by FPGA devices and a CPU module and at least comprises following steps: building the FPGA-based distributed stream processing system having a master node by installing the FPGA devices on slave nodes; dividing stream applications into first tasks suitable to be executed by the FPGA devices and second tasks suitable to be executed by the CPU module; and where the stream applications submitted to the master node are configured with kernel files that can be compiled and executed by the FPGA devices or with uploading paths of the kernel files, making the master node allocate and schedule resources by pre-processing the stream applications.

Abstract: A method of preparing a C/C-SiC composite part, including: preparing, using a solvent evaporation process, carbon fiber composite powders coated with a phenol resin; according to a three-dimensional model of a to-be-prepared part, forming a green part corresponding to the to-be-prepared part using the carbon fiber composite powders and a 3D printing technology; densifying the green part to yield a C/C porous body having a density of 0.7 to 1.1 g/cm3 and an open porosity of 30 to 50%; and siliconizing the C/C porous body under vacuum, removing excess silicon to yield a primary carbon fiber reinforced carbon-silicon carbide (C/C-SiC) body, densifying the primary C/C-SiC body, to obtain a final C/C-SiC composite part.

Abstract: The present application provides a display panel comprising a substrate, a light-emitting device disposed on the substrate, a first inorganic layer and a second inorganic layer sequentially covering the light-emitting device; wherein the density of the second inorganic layer is larger than that of the first inorganic layer, so as to improve the barrier properties against water and oxygen of the display panel. The present application further provides a manufacturing method of a display panel. The encapsulation for the display panel can be improved in the present application.

Abstract: The invention provides a NC control method and a NC control apparatus for implementing the method. The method comprises: acquiring a first NC code and a second NC code, wherein the first NC code comprises first machining information for controlling a tool to machine a workpiece, and the second NC code comprises second machining information for enhancing the first machining information; simultaneously running the first NC code and the second NC code to parse out the first machining information and the second machining information; merging the first machining information and the second machining information; and controlling the tool to machine the workpiece according to the result of the merging. The invention also provides a NC control apparatus and a computer storage medium for machining controlled both by the first and the second NC code.

Abstract: A non-water-cooled high temperature aerosol quantitative dilution sampling probe includes a dilution gas tube, a gas mixing tube, a sampling nozzle and a three-way shunt tube, in which the dilution gas tube is used for introducing a dilution gas, and forms, together with a gas mixing tube coaxially fitted therein, an annular passage for transporting the dilution gas; and the sampling nozzle is composed of an injection hole, an outer nozzle and an inner nozzle, and an annular gas flow gap formed between the inner nozzle and the gas mixing tube accelerates the flow of the dilution gas, and forms a negative pressure around the inner nozzle, thereby achieving the purpose of sucking the sample gas by the outer nozzle and mixing it with the dilution gas.

Abstract: The disclosure belongs to the technical field of photopolymer materials, and more particularly relates to a dual image storage material as well as a preparation method and application thereof. The dual image storage material is obtained by selective photoreaction of 1 to 50 parts by weight of an organic fluorescent material, 7 to 50 parts by weight of liquid crystal, 0.2 to 10 parts by weight of a photoinitiator and 33 to 67 parts by weight of photopolymerizable monomers. The obtained dual image storage material can present a high-brightness holographic pattern under sunlight and a fluorescent pattern under ultraviolet light in the same spatial position. The presented holographic and fluorescent patterns may be the same or different. The obtained dual image storage material can be used in the field of optical anti-counterfeiting, optical information storage, displays or the like.

Abstract: The present disclosure provides an arbitrary double vector and model prediction thrust control method and system, which belongs to the technical field of linear induction motor control. The present disclosure combines a double vector modulation algorithm to improve the modulation accuracy, in which two voltage vectors are used in one cycle, so that the amplitude of the fluctuation can be reduced, thereby improving the running performance of the motor. The addition of the double vector modulation strategy increases the complexity of the algorithm, and the calculation process is too complicated. The present disclosure further proposes a simplified search process instead of the traditional repeated calculation and comparison method, which eliminates the need for a complex online calculation process, thereby simplifying the implementation process of the algorithm in the actual system.