Abstract: A Fresnel lens in a lens body, the lens body is provided with a light incident surface and a light exit surface opposite to each other along a first direction, and the light exit surfaces are adjacently arranged in a second direction perpendicular to the first direction. There are several protruding teeth, and the protruding teeth are formed by an effective surface and an ineffective surface, and the ineffective surface is inclined at an acute angle relative to the first direction. The invention makes the light passing through the lens body reach the effective surface as much as possible, thereby reducing stray light and enhancing light efficiency.

Abstract: A beam processing method, a network device, a base station, and a computer readable storage medium are disclosed. The method may include acquiring first beam identification information and beam time domain information sent by the base station, wherein the beam time domain information comprises beamforming time information that is indicative of a time corresponding to beamforming by the network node for signal directing; determining a first time domain according to the beamforming time information; and forming a first beam for signal directing in the first time domain, wherein the first beam is determined by the network node according to the first beam identification information.

Abstract: A fully-automatic aluminum thermal-spraying corrosion prevention production line based on robots and visual recognition is provided. The production line comprises an automatic feeding system comprising feeding carrying and conveying mechanisms; a laser derusting system comprising a derusting robot, a laser cleaning nozzle and derusting conveying mechanisms; an aluminum thermal-spraying system comprising an aluminum spraying robot and an aluminum thermal-spraying gun; an automatic rolling system comprising a rolling pedestal, a first rolling wheel, a second rolling wheel and a rolling drive mechanism; a laser cutting system; and a discharging and stacking system.

Abstract: An optical fiber transmission device includes a substrate, a photonic integrated circuit, and an optical fiber assembly. The photonic integrated circuit is disposed on an area of the substrate. The substrate has a protruding structure at an interface with an edge of the photonic integrated circuit. The optical fiber assembly includes an optical fiber and a ferrule that sleeves the optical fiber. The protruding structure of the substrate is configured to abut against the ferrule to limit the position of the optical fiber assembly in a vertical direction of the substrate, such that the protruding structure is a stopper for the optical fiber assembly in the vertical direction.

Abstract: The present invention relates to a signal shielding apparatus and an antenna apparatus including same, and in particular, comprises a shield cover which is stacked and disposed on a printed board assembly (hereinafter, abbreviated to “PBA”), in which a plurality of signal-related components are mounted on one side thereof to prevent leakage of a signal from the plurality of signal-related components, wherein a grooved shield cover seating groove is formed in one surface of the PBA, and an insertion end insertably seated in the shield cover seating groove is integrally formed in the other surface from among one surface and the other surface of the shield cover, the other surface facing the one surface of the PBA, thereby providing advantages in that an increase in the manufacturing cost may be prevented, EMI shielding may be facilitated, and heat dissipation performance may be significantly improved.

Abstract: An optical fiber network device includes a fiber and a photonic integrated circuit. Fiber receives a first optical signal and transmits a second optical signal. A first wavelength of first optical signal is different from a second wavelength of second optical signal. Photonic integrated circuit includes a laser chip, a photodetector, a wavelength division multiplexing coupler, a first optical modulation element and a second optical modulation element. Laser chip is disposed on photonic integrated circuit, and is configured to generate first optical signal. Photodetector detects second optical signal. Wavelength division multiplexing coupler is configured to couple first optical signal to fiber, and receives second optical signal. First optical modulation element is coupled to wavelength division multiplexing coupler and laser chip, and is configured to modulate first optical signal.

Abstract: Embodiments of this application disclose a head-mounted wireless headset and a communication method thereof, and relate to the communication field. A specific solution is as follows: The head-mounted wireless headset includes: a first headphone, including: a first short-range wireless communication chip and a first radio frequency antenna, where the first short-range wireless communication chip is coupled to the first radio frequency antenna; a second headphone, including: a second short-range wireless communication chip and a second radio frequency antenna, where the second short-range wireless communication chip is coupled to the second radio frequency antenna; and a data bus, separately connected to the first short-range wireless communication chip and the second short-range wireless communication chip, and configured to provide a physical link required for communication between the first short-range wireless communication chip and the second short-range wireless communication chip.

Abstract: A memory array and an operation method of the memory array are provided. The memory array includes first and second ferroelectric memory devices formed along a gate electrode, a channel layer and a ferroelectric layer between the gate electrode and the channel layer. The ferroelectric memory devices include: a common source/drain electrode and two respective source/drain electrodes, separately in contact with a side of the channel layer opposite to the ferroelectric layer, wherein the common source/drain electrode is disposed between the respective source/drain electrodes; and first and second auxiliary gates, capacitively coupled to the channel layer, wherein the first auxiliary gate is located between the common source/drain electrode and one of the respective source/drain electrodes, and the second auxiliary gate is located between the common source/drain electrode and the other respective source/drain electrode.

Abstract: A preparation method of a zeolite/polyimide composite membrane includes: synthesizing a zeolite-doped polyamic acid precursor casting solution by condensation polymerization synthesis; coating a substrate with the obtained casting solution, and obtaining a zeolite/polyamic acid composite porous membrane by non-solvent induced phase separation; and obtaining the zeolite/polyimide composite membrane by performing thermal imidization on the zeolite/polyamic acid composite porous membrane through gradient heating.

Abstract: Disclosed are a lithium metal composite electrode material for a lithium metal battery, a preparation method for the same, and an electrode, battery, battery module, battery pack and apparatus comprising the same. The lithium metal composite electrode material comprises: lithium metal particles and a lithium-containing conductive layer serving as a supporting framework, the supporting framework being filled with the lithium metal particles; wherein the lithium-containing conductive layer comprises an inorganic lithium compound and a lithium alloy.

Abstract: The present disclosure relates to reconstructing an image.

Abstract: A high-frequency composite impactor including a high-frequency axial and a torsional impact assembly is disclosed. The high-frequency axial impact assembly includes an upper self-excited oscillation cavity, a lower self-excited oscillation cavity, an adjustment block and a lock nut. The torsional impact assembly includes an upper end cover, a reversing switch, a pendulum, a lower shell, a lower end cover, a nozzle, a connecting block and a retaining ring. The high-frequency axial impact assembly converts the flowing drilling fluid into a pulsed jet to achieve a high-frequency axial impact. The torsional impact assembly enables a torsional impact through a shunt, and finally enables a high-frequency composite impact, which can effectively reduce the stick-slip of the drill string, jump drilling and other downhole accidents. By reducing the friction between the drill string and the borehole wall, the impactor can reduce WOB loss, increase the ROP, and improve the drilling efficiency.

Abstract: The present disclosure provides a storage unit, a data writing method and a data reading method thereof, a memory and an electronic device. The storage unit includes a semiconductor substrate, a first insulating medium layer, a ferroelectric thin film layer, a bottom electrode, a tunnel junction, a first metal interconnection portion, a second metal interconnection portion, a third metal interconnection portion and a fourth metal interconnection portion. The first insulating medium layer is formed on the semiconductor substrate, the ferroelectric thin film layer is disposed on the first insulating medium layer, the bottom electrode is formed on the ferroelectric thin film layer, and the tunnel junction is formed on the bottom electrode. The first metal interconnection portion is connected to a first end of the bottom electrode, and the third metal interconnection portion is connected to a second end of the bottom electrode.

Abstract: A drone swarm control method is provided. The drone swarm control method includes displaying a drone swarm and a three-dimensional (3D) terrain projected onto a virtual reality (VR) space by using a VR headset, based on user manipulation, selecting a small-scale drone swarm, provided in a region of interest (ROI) set in the 3D terrain, from the drone swarm by using a VR controller, based on the user manipulation, and dividing, by using a server, the ROI into a plurality of cells, respectively allocating the divided plurality of cells to drones included in the small-scale drone swarm, and automatically generating a 3D flight path of a drone allocated to each of the divided plurality of cells, based on user input information representing the small-scale drone swarm and the ROI.

Abstract: Disclosed is an operation method of a memory device which includes a plurality of memory cells stacked in a direction perpendicular to a substrate and a plurality of word lines respectively connected with the plurality of memory cells. The method includes applying a 0-th pass voltage to a first selected word line among the plurality of word lines and applying a first pass voltage to a first upper adjacent word line among the plurality of word lines, during a first word line setup period, and applying a first program voltage to the first selected word line and applying a second pass voltage smaller than the first pass voltage to the first upper adjacent word line, during a first program execution period after the first word line setup period. The first upper adjacent word line is a word line physically adjacent to the first selected word line.

Abstract: A vehicular software update system for remotely performing a software update of a vehicle and a method thereof are provided. The vehicular software update system includes a management controller installed in a vehicle and a server that performs a remote software update in cooperation with the management controller. The management controller controls the vehicle to start in response to receiving a request for the remote software update from the server, downloads software for update from the server after controlling the vehicle to start, transmits the downloaded software for update to a performance controller in the background, determines whether the transmission of the software for update in the background is completed based on the vehicle being turned off, and performs a software update of the performance controller using the software for update based on the transmission of the software for update in the background being completed.

Abstract: A method for generating adversarial examples for a Graph Neural Network (GNN) model. The method includes: determining vulnerable features of target nodes in a graph based on querying the GNN model, wherein the graph comprising nodes including the target nodes and edges, each of the edges connecting two of the nodes; grouping the target nodes into a plurality of clusters according to the vulnerable features of the target nodes; and obtaining the adversarial examples based on the plurality of clusters.

Abstract: A multi core optical fiber that includes a plurality of cores disposed in a cladding. The plurality of cores include a first core and a second core. The first core has a first propagation constant ?1, the second core has a second propagation constant ?2, the cladding has a cladding propagation constant ?0, and (I).

Abstract: A powder-based three-dimensional printing (3DP) method, device and system, and a computer-readable storage medium. The method includes: analyzing printing images of layers corresponding to a part to be printed to determine a target print image and adding a preset mark to the target print image which includes a print image of a target layer that causes a previous powder layer of the target layer to displace during printing; acquiring an image to be printed of a current layer to be printed; identifying the image to be printed to determine whether the preset mark exists on the image to be printed; and if yes, processing the current layer to be printed and/or a previous powder layer of the current layer to be printed such that the previous powder layer of the current layer does not move with powder spreading of the current layer.