Abstract: A holographic 3D display system based on virtual array splicing of a spatial light modulator includes a laser configured to generate a coherent light beam, first, second and third beam splitters, first and second reflectors, a shutter array, a spatial filter array, a solid lens, first and second light beam deflection elements and a spatial light modulator. The first and second beam splitters and the first reflector are configured to split the light beam generated by the laser into three parallel light beams to irradiate the shutter array. The shutter array is configured to control the three parallel light beams to sequentially pass therethrough according to a set time sequence. The three parallel light beams passing through the shutter array are expanded and collimated by the spatial filter array and the solid lens to form three parallel light beams with the same size and uniform intensity.

Abstract: The present disclosure provides a self-regulating electric heating film, including: an insulating isolation layer, an interdigital electrode arranged on the surface of the insulating isolation layer, a positive temperature coefficient coating covering the surface of a secondary electrode of the interdigital electrode, and an insulating protective layer covering the surface of a primary electrode of the interdigital electrode, wherein the positive temperature coefficient coating is not in contact with the primary electrode of the interdigital electrode, and the insulating protective layer overlaps the positive temperature coefficient coating.

Abstract: This disclosure relates to an immersive ankle rehabilitation training method and electronic apparatus based on upper limb motion signals. The innovation of this technology lies in that: firstly, this disclosure proposes a hybrid model of Regression LSTM corrected by a sliding window based voting algorithm, which predicts the changing angle of the user's wrist joint through wearable EMG sensors; secondly, this disclosure designs and develops two different VR training scenes for users of dorsiflexion and plantar flexion of foot; during the training, users wear VR headwear displays and EMG monitoring devices, to continuously perform wrist dorsiflexion or wrist palm flexion movements, predict the change in wrist joint angles in real-time through forearm sEMG signals, and map it to the contralateral ankle of the avatar in the virtual scene for rotation.

Abstract: The present invention discloses a coevolution-based multi-beamforming optimizing method for space-based ADS-B, which belongs to the field of aviation technologies. According to this method, after initializing population and acquiring an initial optimal solution, optimization parameters are firstly grouped randomly so that all beams form several significant uncovered regions. Then, grouping is performed by an adaptive grouping strategy based on the relative orientation between the mean center of the largest uncovered region and the direction of each beam, so that the parameters quickly converge to a full-coverage state within the half angle of the satellite. Finally, grouping is performed by a grouping strategy based on the aircraft density covered by each beam to obtain optimally the minimal update time interval under a full-coverage constraint.

Abstract: A magnetic particle imaging (MPI) device based on an asymmetric bilateral structure includes a fixed section and a movable section. The fixed section includes a pair of magnetic field generation coils, and the magnetic field generation coils are configured to generate a uniform and variable magnetic field and drive a field-free point (FFP) to move along a Z-axis direction. The movable section includes a permanent magnet, excitation coils and a reception coil. The permanent magnet is configured to cooperate with the magnetic field generation coils to generate the FFP. The excitation coils are configured to move the FFP on a two-dimensional plane and excite magnetic particles to generate a nonlinear response signal. The reception coil is configured to receive an MPI signal. The MPI device is simple in structure and convenient to operate, and can perform targeted local imaging or covered overall imaging on the target object.

Abstract: The present invention discloses a method for UAV path planning in urban airspace based on a safe reinforcement learning (RL) algorithm called shield-DDPG, which combines a shield model with a DDPG algorithm and pertains to the field of UAV technologies. The method takes an attractive force from the destination point into account when an action is selected, which improves the convergence speed of the algorithm and also improve the efficiency of UAV path planning. More importantly, the method provided by the present invention can effectively verify safety of an action in terms of the air collision risk and the ground impact risk, and ensure that a final output of the algorithm is a safe optimal solution. Therefore, the present invention can effectively solve the problem that when the RL algorithm is used for UAV path planning, it is difficult to ensure the safety of the learning or execution process due to the lack of hard constraints.

Abstract: The present application provides a CAD model analysis method and apparatus, a device and a storage medium, which relates to the technical field of industrial manufacturing. The CAD model based on a BRep representation is transformed into a graph structure. The graph structure is input into an analytical model to obtain a modeling sequence of the CAD model.

Abstract: An MPI device based on parallel scanning of multiple magnetic field free lines (FFLs) is provided. The MPI device includes a first coil, a second coil, an excitation coil, and a receiving coil; the first coil is configured to receive a first-frequency current and generate a plurality of FFLs; the second coil is configured to receive the first-frequency current and drive the FFLs to rotate under a joint action with the first coil; the excitation coil is configured to receive a second-frequency current and drive the FFLs to scan fast; the receiving coil receives a particle signal scanned by the FFLs at each time point; and the first coil, the second coil, the excitation coil and the receiving coil are provided in longitudinal symmetry along the center of the imaging field of view.

Abstract: A three-dimensional (3D) magnetic particle imaging (MPI) method and system without rotating a field-free line (FFL) are disclosed. In accordance with the method, an FFL is generated such that magnetic particles in a region far from the FFL enter a magnetic saturation state. Further, a non-uniform mixed-frequency excitation magnetic field parallel to the FFL is applied to generate intermodulation response signals. In addition, the intermodulation response signals are acquired, amplified and filtered. Moreover, the intermodulation response signals are transmitted to a digital signal processing unit and an image reconstruction unit, and an encoding matrix is constructed. Additionally, a one-dimensional (1D) concentration distribution of the magnetic particles is reconstructed based on the encoding matrix and an actually measured voltage signal. The FFL is driven for line-by-line scanning along a vertical plane of the FFL, thereby achieving 3D imaging.

Abstract: An electromagnetic leakage red and black signal identification method based on information entropy characteristics includes: acquiring electromagnetic information leakage signals of an information device in an idle state and an information processing state respectively, and calculating information entropy of the electromagnetic leakage signals in the idle state and the information processing state; and calculating an information entropy change of the electromagnetic leakage signals caused by information processing, and determining whether an electromagnetic leak contains red signals when the device processes information according to the information entropy change, so as to give an electromagnetic leakage red and black signal identification result.

Abstract: A steering wheel suspension structure of an omnidirectional mobile robot includes a steering wheel connecting ring, a plurality of leaf spring connecting beams and a chassis mounting section. The steering wheel suspension structure is an integrated plate structure. The steering wheel connecting ring is connected with a steering wheel, and the chassis mounting section is connected with a robot chassis. The leaf spring connecting beam is connected with the steering wheel connecting ring and the chassis mounting section, and the leaf spring connecting beam is used as the main component of suspension deformation. The suspension structure is simple, easy to install, light in weight, less in space, and highly integrated with the steering wheel assembly. When the suspension is deformed by the force, it weakens the radial force and only has the displacement and force in the vertical direction, thus ensuring the handling performance of the chassis.

Abstract: A large-scale UAV mission planning method includes constructing an objective function and its constraints; initializing a mission sequence and inserting customers into the mission sequence with the smallest objective function value to obtain a plurality of initial mission sequences; iteratively performing the update operations on the plurality of initial mission sequences. Fast acquisition of optimal missions is achieved by the invention. This invention solves the existing problem of not being able to obtain the optimal mission due to the complex and time-consuming calculation method and the difficulty of convergence of the algorithm.

Abstract: The present disclosure relates to a multi-classification non-intrusive identification and detection method for an electrical signal based on naive Bayes, including an expert database module and a signal classification module. An electrical signal training sample of a known category is built based on historical and real-time aircraft signals. Classification is performed based on a built naive Bayes model classifier, to obtain an aircraft signal classification result. P(yi) is separately calculated for each category, a conditional probability is calculated for each feature, and a classification result of a sample signal is obtained through statistic acquisition by using a probability comparison algorithm. A next status is predicted by using a time series prediction method after electrical signal data is classified and determined by using a naive Bayes algorithm.

Abstract: The present disclosure provides a high-accuracy, fast, and phase-based laser ranging method. The method includes: S1, obtaining an eigen signal and an avalanche photon diode (APD) echo signal whose phases are different and frequencies are the same; S2, performing, through an adaptive filtering method, denoising on an initial signal, to obtain two denoised signals; S3, separately performing data splitting, reconstitution, and all-phase fast Fourier transform on the denoised signals, to obtain a frequency-phase spectral line of the eigen signal and a frequency-phase spectral line of the APD echo signal; S4, separately traversing maximum phase values of the frequency-phase spectral line of the eigen signal and the frequency-phase spectral line of the APD echo signal, to obtain a phase difference ??; S5, converting the phase difference ?? into a distance; S6, performing signal mean filtering processing, and S7, performing Kalman filtering processing.

Abstract: An antenna includes a substrate and a radiator fixed to the substrate. A thermal protection system for the antenna includes a thermal protection sheet body opposite to and spaced from the antenna, where the thermal protection sheet body separates the antenna from an external heat source; and a groove body formed in the thermal protection sheet body, where the radiator generates an antenna near field toward the outside, and an inner wall of the groove body is adapted to an edge of the antenna near field to reduce the deterioration of antenna performance caused by the thermal protection sheet body. The overall electrical performance and the thermal protection performance of the thermal protection system can be well balanced by decreasing the thickness of a middle area of the thermal protection system or by etching a groove in a certain shape in the thermal protection system.

Abstract: An antenna includes a substrate and a radiator fixed to the substrate. A thermal protection system for the antenna includes a thermal protection sheet body opposite to and spaced from the antenna, where the thermal protection sheet body separates the antenna from an external heat source; and a groove body formed in the thermal protection sheet body, where the radiator generates an antenna near field toward the outside, and an inner wall of the groove body is adapted to an edge of the antenna near field to reduce the deterioration of antenna performance caused by the thermal protection sheet body. The overall electrical performance and the thermal protection performance of the thermal protection system can be well balanced by decreasing the thickness of a middle area of the thermal protection system or by etching a groove in a certain shape in the thermal protection system.

Abstract: The embodiments of the present disclosure disclose gaze estimation cross-scene adaptation method and device based on outlier guidance. A specific implementation of the method comprises: performing pre-training on a source domain based on a given arbitrary gaze estimation model, to obtain a collaborative learning model group; determining an average collaborative model corresponding to each collaborative learning model in the collaborative learning model group, to obtain an average collaborative model group; generating an outlier corresponding to the collaborative learning model group based on a target image, the collaborative learning model group and the average collaborative model group; using an outlier loss function and the outlier to optimize the collaborative learning model group; using any collaborative learning model in the optimized collaborative learning model group to perform gaze estimation.

Abstract: An electronic device heat dissipation system with a sugar alcohol PCM energy storage unit includes a cooling circulation pipeline, a heat dissipation cold plate, an energy storage heat exchanger, a crystal powder feeder, and a radiator. Fluid in the cooling circulation pipeline flows sequentially through the heat dissipation cold plate and the energy storage heat exchanger, and the fluid flowing out of the energy storage heat exchanger can optionally pass through the radiator. The energy storage heat exchanger is filled with a sugar alcohol PCM as an energy storage medium, the energy storage medium can absorb heat, melt, solidify and regenerate, and the crystal powder feeder input crystal powder of the energy storage medium to improve a solidification and regeneration speed of the energy storage medium. Heat storage capacity of the sugar alcohol PCM is used, combined with the radiator and the heat dissipation cold plate to achieve temperature control.

Abstract: The embodiments of the present disclosure disclose image defogging method. A specific mode of carrying out the method includes the steps to: obtain a polarized fog-free scene image set, generate a first quintuple based on each polarized fog-free scene image, and obtain a first quintuple set; extract pixel coordinates meeting a preset condition from the significant polarization image included in each first quintuple, to obtain a pixel coordinate group to generate a second quintuple; generate a simulated polarization foggy scene image sequence based on each second quintuple, to obtain a simulated polarization foggy scene data set; design a polarization state attention neural network; obtain a polarized foggy scene image, and input the polarized foggy scene image into the polarization state attention neural network to obtain a polarized defogging image. This embodiment can still improve the accuracy of image defogging with poor lighting conditions.

Abstract: The embodiments of the present disclosure disclose an edge-guided human eye image analyzing method. A specific implementation of this method comprises: collect a human eye image as an image to be detected; obtain a human eye detection contour map; obtain a semantic segmentation detection map and an initial human eye image detection fitting parameter; performing an iterative search on the initial human eye image detection fitting parameter to determine a target human eye image detection fitting parameter; sending the semantic segmentation detection map and the target human eye image detection fitting parameter as image analyzing results to a display terminal for display. This implementation improves the accuracy at the boundary dividing the pupil-iris area, and increases the structural integrity of the ellipse resulted from dividing the pupil-iris area. In addition, the iterative search can achieve a more accurate ellipse parameter fitting result.