Abstract: A surface defect detection method for a primary cable of an aerostat based on few-shot learning includes the following steps. A hardware and software system environment is set. A surface image of the primary cable is acquired and processed to obtain augmented surface image data, which is labeled to construct a surface defect sample library. A defect detection network model is designed and constructed, and then is trained based on the surface defect sample library. A query set in the surface defect sample library is processed with the trained defect detection network model to obtain shallow texture features and high-level semantic features. The shallow texture features are transferred to the high-level semantic features through skip connection. The surface defect detection data under different detection operation modes are obtained at a terminal. This application also provides a surface defect detection system.

Abstract: Provided are a 3D reconstruction method and apparatus, an electronic device and a storage medium. The 3D reconstruction method comprises: using a plurality of cameras with different viewing angles to image a symbol to obtain a symbol image, a reference object for camera calibration being called the symbol, the symbol including a plurality of markers, and each of the markers having a corresponding ID number; identifying the ID number of the marker in the symbol image and searching for world coordinates corresponding to the marker according to the ID number; computing an external parameter matrix of the camera according to marker coordinates of a camera coordinate system and marker coordinates of a world coordinate system, and unifying point clouds under the world coordinate system to obtain a plurality of point clouds under different viewing angles; and stitching the plurality of point clouds together to obtain a 3D reconstructed image.

Abstract: A chip-package-antenna integrated structure based on an SIW multi-feed network. A plurality of output terminals of the chip are connected to the SIW multi-feed network through the impedance matching network, to achieve the impedance matching between the chip and the SIW multi-feed network. The output terminal of the SIW multi-feed network is directly connected to the antenna terminals, and two or more input signals experience power combining in the substrate integrated waveguide are combined for power combining. Then the combined millimeter-wave signal is radiated by the antenna, finally realizing the power combining in the chip-package-antenna integrated structure. At the same time, the SIW multi-feed network is composed of a SIW structure, in which a plurality of via holes are arranged spaced apart to form a cavity structure.

Abstract: This application provides a transmission absorbing structure and an antenna in-band characteristics test system, relating to design of microwave antennas for radar and communication systems. The transmission absorbing structure includes a coupling feed structure provided with coupling slots for energy coupling with a to-be-tested antenna, two equivalent electric wall structures parallel to each other, and two equivalent magnetic wall structures parallel to each other. The two equivalent electric wall structures and the two equivalent magnetic wall structures together enclose the coupling feed structure, and form a transverse electromagnetic mode (TEM) waveguide. The system includes a vector network analyzer, a to-be-tested antenna electrically connected to the vector network analyzer, and a transmission absorbing structure.

Abstract: A universal automatic test system for a digital plugboard based on imagine processing, includes a digital plugboard test platform, an image acquisition and processing module, a test instrument module and a control and processing module. The universal automatic test system can determine a type of the digital plugboard and a point to be test based on the image of the digital plugboard, and call a corresponding automatic test program to complete the test of each point. A type of the output signal can be obtained through the universal automatic test system. By moving the detection probe, the any position of the digital plugboard can be test, and a fault portion of the digital plugboard can be obtained according to the test result.

Abstract: The present disclosure provides a broadband dual-polarized solar cell antenna and an antenna array. The broadband dual-polarized solar cell antenna includes an antenna dipole layer, an isolation layer, a solar cell layer, and a ground that are arranged sequentially from top to bottom, where the antenna dipole layer is connected to the ground and a radio frequency (RF) coaxial connector through a metal feeding probe structure, the solar cell layer is placed on the ground, the isolation layer is located between the antenna dipole layer and the solar cell layer, and the isolation layer is made of a transparent material. The present disclosure is small in sunlight shielding and high in transparency, and has a broadband dual-polarized wide-angle scanning capability, which ensures performance of the antenna and power generation efficiency of the solar cell, and is highly applicable in engineering.

Abstract: The present disclosure provides a broadband dual-polarized solar cell antenna and an antenna array. The broadband dual-polarized solar cell antenna includes an antenna dipole layer, an isolation layer, a solar cell layer, and a ground that are arranged sequentially from top to bottom, where the antenna dipole layer is connected to the ground and a radio frequency (RF) coaxial connector through a metal feeding probe structure, the solar cell layer is placed on the ground, the isolation layer is located between the antenna dipole layer and the solar cell layer, and the isolation layer is made of a transparent material. The present disclosure is small in sunlight shielding and high in transparency, and has a broadband dual-polarized wide-angle scanning capability, which ensures performance of the antenna and power generation efficiency of the solar cell, and is highly applicable in engineering.

Abstract: A transformable stratospheric airship includes an upper shell, a lower shell, a foldable hull, and a plurality of cable control mechanisms provided on the upper shell and the lower shell. The foldable hull includes a sealed body, a plurality of guide holes arranged outside the sealed body and a cable which passes through the guide holes according to a predetermined order. The cable is configured to keep a shape of the sealed body and connected to the cable control mechanisms to fix the sealed body to the upper shell and the lower shell. The foldable hull is foldable and extendable along a vertical direction of the transformable stratospheric airship by controlling a length of the cable via the cable control mechanisms.

Abstract: The present disclosure provides an electron source operating method, the electron source including at least one emission site fixed on a tip, the emission site being a reaction product formed by metal atoms of a surface of the tip and gas molecules under an electric field, and the operating method comprises emitting electrons by controlling operating parameters of the electron source.

Abstract: Disclosed is a digital twin tethered balloon system; key running state data of a tethered balloon is collected through an Internet of Things of a tethered balloon system; the key running state data of the tethered balloon is transmitted to a twin data service center; the twin data service center receives, analyzes and stores the data and forwards the data to a tethered balloon digital twin system; the tethered balloon digital twin system simulates a pose of a tethered balloon body and the movement of a ground tethering facility; and the tethered balloon monitoring service provides running state monitoring, quality problem tracking, fault prediction and early warning, automatic control and other services.

Abstract: The present disclosure provides a method of manufacturing an electron source. The method includes forming one or more fixed emission sites on at least one needle tip, the fixed emission sites including a reaction product formed by metal atoms on a surface of the needle tip and gas molecules.

Abstract: The present disclosure provides a method of regenerating an electron source, the electron source including at least one emission site fixed on a needle tip, and the emission site including a reaction product formed by metal atoms and gas molecules. The method includes regenerating the electron source in situ if an emission capability of the electron source satisfies a regeneration condition.

Abstract: The present disclosure provides an electron source, including one or more tips, wherein at least one of the tips comprises one or more fixed emission sites, wherein at least one of the tips includes one or more fixed emission sites, wherein the emission sites includes a reaction product of metal atoms on a surface of the tip with gas molecules.

Abstract: A method for automatically generating hierarchical exploded views based on assembly constraints and collision detection, in which parts to be exploded are layered in explosion sequence according to a design result of the 3D assembly process planning, and the parts to be exploded in each layer are grouped based on the type and the disassembly direction; a feasible explosion direction of the parts in each layer is determined according to assembly constraints and collision detection; the explosion sequence and explosion direction of the parts in each layer are determined; and then the layered explosion is performed at a certain distance. Ball markers and a part-list are generated after all the parts are exploded.

Abstract: The present disclosure provides a method for manufacturing a particle source comprising: placing a metal wire in vacuum, introducing active gas, adjusting a temperature of the metal wire and applying a positive high voltage V to the metal wire to generate at a side of the head of the metal wire an etching zone in which field induced chemical etching (FICE) is performed; increasing by the FICE a surface electric field at the top of the metal wire head to be greater than a field evaporation electric field of material for the metal wire, so that metal atoms at the top of the metal wire are evaporated off; after the field evaporation is activated by the FICE, causing mutual adjustment between the FICE and the field evaporation, until the head of the metal wire has a shape of combination of a base and a tip on the base; and stopping the FICE and the field evaporation when the head of the metal wire takes a predetermine shape.

Abstract: The present disclosure provides a method for manufacturing a particle source, comprising: placing a metal wire in vacuum, introducing active gas and catalyst gas, adjusting a temperature of the metal wire, and applying a positive high voltage V to the metal wire to dissociate the active gas at the surface of the metal wire, in order to generate at a peripheral surface of the head of the metal wire an etching zone in which field induced chemical etching (FICE) is performed; increasing by the FICE a surface electric field at the top of the metal wire head to be greater than the to evaporation field of the material for the metal wire, so that metal atoms at the wire apex are evaporated off; after the field evaporation is activated by the FICE, causing mutual adjustment between the FICE and the field evaporation, until the head of the metal wire has a shape of combination of a base and a tip on the base; and stopping the FICE and the field evaporation when the head of the metal wire takes a predetermine shape.

Abstract: The present disclosure provides a method for manufacturing a particle source comprising: placing a metal wire in vacuum, introducing active gas, adjusting a temperature of the metal wire and applying a positive high voltage V to the metal wire to generate at a side of the head of the metal wire an etching zone in which field induced chemical etching (FICE) is performed; increasing by the FICE a surface electric field at the top of the metal wire head to be greater than a field evaporation electric field of material for the metal wire, so that metal atoms at the top of the metal wire are evaporated off; after the field evaporation is activated by the FICE, causing mutual adjustment between the FICE and the field evaporation, until the head of the metal wire has a shape of combination of a base and a tip on the base; and stopping the FICE and the field evaporation when the head of the metal wire takes a predetermine shape.

Abstract: The present disclosure provides a method for manufacturing a particle source, comprising: placing a metal wire in vacuum, introducing active gas and catalyst gas, adjusting a temperature of the metal wire, and applying a positive high voltage V to the metal wire to dissociate the active gas at the surface of the metal wire, in order to generate at a peripheral surface of the head of the metal wire an etching zone in which field induced chemical etching (FICE) is performed; increasing by the FICE a surface electric field at the top of the metal wire head to be greater than the to evaporation field of the material for the metal wire, so that metal atoms at the wire apex are evaporated off; after the field evaporation is activated by the FICE, causing mutual adjustment between the FICE and the field evaporation, until the head of the metal wire has a shape of combination of a base and a tip on the base; and stopping the FICE and the field evaporation when the head of the metal wire takes a predetermine shape.