637 results about "Shielding effect" patented technology

The invention provides a modified basalt fiber, a basalt fiber shielding material and a preparation method, and relates to the technical field of fiber composites.The modified basalt fiber comprises an activated basalt fiber, an adhesion layer and an electromagnetic shielding layer, and the surface of the activated basalt fiber is sequentially coated with the adhesion layer and the electromagnetic shielding layer; the adhesion layer comprises polydopamine; the electromagnetic shielding layer comprises magnetic Fe3O4 nano particles and a graphene nano sheet; the mass ratio of the activated basalt fibers to the polydopamine to the magnetic Fe3O4 nanoparticles to the graphene nanosheets is 1 to (0.4 to 0.5) to (0.6 to 1) to (0.1 to 0.25). According to the basalt fiber shielding material provided by the invention, the conductive particles and the magnetic particles are combined, and by optimizing the material components and proportion, a very good electromagnetic wave absorption and shielding effect can be achieved, a wider frequency band shielding effect can be provided, and electromagnetic radiation in various frequency ranges can be effectively covered.

The invention discloses a composite shielding material effect experiment data analysis method, and particularly relates to the field of material shielding effect analysis, and the method comprises the following steps: measuring key data such as dielectric constant, magnetic conductivity, conductivity and thickness of each layer of a composite shielding material through an electromagnetic performance measurement instrument; establishing an electromagnetic wave propagation model for describing propagation of electromagnetic waves in the multilayer medium based on a Maxwell equation, and defining boundary conditions of a test sample; time domain and frequency domain characteristics of an electromagnetic interference source are simulated through Fourier transform, and actual input interference is simulated. And analyzing the dynamic response of the electromagnetic wave propagation model under transient and steady-state interference signals to form an electromagnetic wave interference response propagation model. Through comparison with actual shielding effectiveness test data, model parameters are adjusted, and it is ensured that model calculation errors are within an acceptable range. A full-band shielding effectiveness prediction map of the composite shielding material is generated based on the model, and theoretical support is provided for material design and optimization.

The invention relates to the technical field of fusion devices, and discloses a flange structure of a cold shield sector of a nuclear fusion device, the cold shield device and the nuclear fusion device, and the flange structure of the cold shield sector of the nuclear fusion device comprises a first panel; the second panel and the first panel are arranged at an interval; the flanging assembly is arranged between the first panel and the second panel and comprises a first flanging and a second flanging, the first flanging is connected with the first panel, the second flanging comprises a main body part and a flat plate part which are connected, the main body part is connected with the second panel, and the flat plate part is arranged at the ends, away from the second panel, of the main body part and the first flanging; the surface, opposite to the second panel, of the flat plate part is a polished surface; the connecting piece is connected with the first flange and the second flange in a fastening manner; and the first insulating part is arranged between the first flange and the second flange in an insulating manner. According to the flange structure of the cold shield sector of the nuclear fusion device, the heat shielding effect can be improved, and the heat radiation influence on low-temperature components is reduced.

A self-adaptive electromagnetic interference shielding and signal enhancement system belongs to the field of electronics and communication and comprises a signal feature analysis module, a dynamic shielding design module, a signal enhancement module, an intelligent adjustment module and a feedback adjustment module. According to the invention, the shielding effect and the signal enhancement strategy can be dynamically adjusted according to the change of the real-time electromagnetic environment. The intensity, the frequency and the position of an interference signal are monitored in real time through spectrum analysis and a multi-mode sensing technology. An intelligent material or a tunable structure is used to dynamically adjust electromagnetic parameters of a shielding material, and an efficient shielding effect is achieved. Various types of electromagnetic interferences, including high-frequency, low-frequency and transient interferences, can be effectively suppressed. Through a multi-sensor fusion technology, types and features of interference sources are accurately identified, and targeted shielding is realized. In a complex electromagnetic environment, a plurality of interference sources can be processed at the same time, and signal distortion or loss is avoided.

The present invention relates to the field of high-rate mobile wireless communications. Disclosed are a multi-frequency multi-polarized wide-beam scanning base station system, and an optimization design method. The method comprises: on the basis of an aperture field expansion theory and a mode coupling theory, designing a conical horn feed source antenna capable of radiating a Gaussian fundamental mode beam, and providing a stable beam width and a stable phase center; designing a beam separation device based on a periodic structure, wherein the beam separation device includes band-pass frequency selective surfaces and a linear polarization grid; and combining front-end quasi-optical links of multiple frequency channels and multiple polarized channels, so as to increase the bandwidth and communication rate of a base station antenna. In the present invention, a genetic optimization algorithm is combined with reflector shaping, thereby effectively reducing the conflict between a shielding effect of a dual-reflector antenna and a scanning angle, and realizing the multiplication of a beam scanning angle.

The invention discloses a test system and method for providing a large weak magnetic space based on a high-frequency magnetic field, relates to the technical field of magnetic shielding coefficient test of a magnetic shielding space, and mainly aims to solve the problems that the internal space of existing equipment for providing the weak magnetic space is small; the system comprises a high-frequency magnetic field emission module, a magnetic field intensity acquisition module and a passive magnetic shielding assembly. The high-frequency magnetic field transmitting module comprises at least one pair of large coils with the same number of winding turns, and the large coils are coaxially arranged in parallel and used for transmitting a high-frequency magnetic field to the passive magnetic shielding assembly; the passive magnetic shielding assembly provides a weak magnetic space after performing a magnetic shielding effect on the high-frequency magnetic field; and the magnetic field intensity acquisition module is used for acquiring and recording the magnetic field intensity in the weak magnetic space in the passive magnetic shielding assembly.

The invention provides a magnetic shielding box for weak magnetic signal measurement and a shielding effectiveness estimation method. The magnetic shielding box comprises a non-magnetic supporting frame and a shielding mechanism. The non-magnetic supporting frame is a cuboid, is at least arranged along the edges of the cuboid and is used for supporting the shielding mechanism, and the interior of the non-magnetic supporting frame is hollow so as to accommodate an object to be detected; the shielding mechanism at least comprises N layers of plate layer structures, plate layer fixing pieces and plate layer supporting pieces; the plate layer structures are sequentially arranged outside the non-magnetic supporting frame in a sleeving mode so as to isolate an external magnetic field of the magnetic shielding box. The plate layer fixing piece sequentially penetrates through all the plate layer structures and is fixedly embedded into the non-magnetic supporting frame. The plate layer supporting pieces are at least arranged between the two adjacent plate layer structures and used for controlling the distance between the two adjacent plate layer structures. N is an integer greater than or equal to 2. The problem of complex manufacturing of the magnetic shielding box can be solved, and the shielding effects of different frequency bands are ensured.

The invention provides a floating nuclear power platform and a radiation shielding system thereof. The radiation shielding system comprises a primary shielding structure, a combined shielding structure and a containment shielding structure, the primary shielding structure covers the outer side of a reactor pressure vessel to perform primary shielding on the reactor pressure vessel, the combined shielding structure sleeves a loop pipeline and accessory equipment thereof, and the containment shielding structure is arranged in the containment structure; the primary shielding structure comprises a first heat preservation layer wrapping the outer side of the pressure vessel shell, a shielding water tank covering the first heat preservation layer and a shielding material layer covering the outer side of the shielding water tank, and the shielding water tank is hollow to contain water. The combined shielding structure comprises a high-density alloy layer and a second thermal insulation layer; the high-density alloy layer is sleeved outside the loop pipeline and accessory equipment thereof; the second thermal insulation layer is sleeved outside the high-density alloy layer; the containment shielding structure comprises a lead plate, a polyethylene plate layer, a boron-containing polyethylene plate layer and an outer steel plate layer which are arranged in the containment structure. According to the radiation shielding system provided by the invention, the total radiation shielding weight can be reduced by 20-40% while the radiation shielding effect is guaranteed.

The utility model relates to the field of electromagnetic shielding films, in particular to an electromagnetic shielding film, which comprises a multi-layer composite structure and is characterized in that the electromagnetic shielding film is formed by compounding at least four layers of materials, namely a base material layer 1, a conductive grid layer 2, an electromagnetic absorption layer 3 and a protective layer 4 in sequence; the base material layer 1 adopts a light high-strength polymer film as a substrate and has excellent flexibility and mechanical strength; the conductive grid layer 2 is located on the base material layer 1, is of a grid structure formed by fine metal wires or high-conductivity polymer fibers, is formed through a precise weaving or printing technology and is used for guiding and dispersing electromagnetic wave energy; the technical problem that the service life and the shielding effect of the electromagnetic shielding film are affected due to the fact that the electromagnetic shielding film is prone to abrasion, scraping and the like in the long-term use process is solved.

The invention discloses an electric leakage detection method of an explosion-proof distribution box, particularly relates to the technical field of electric power safety in flammable and explosive environments, and is used for solving the problems of electric leakage signal attenuation and insufficient detection sensitivity caused by an eddy current effect of a metal explosion-proof shell. An original electric leakage signal of a wire in a box is obtained, and an eddy current compensation factor is constructed based on the material and thickness of a shell to carry out gain compensation; shell surface temperature distribution and three-dimensional magnetic field components are synchronously collected, and a compensation failure state is judged through collaborative analysis of high-temperature area migration acceleration and magnetic field polarization angle offset; when the compensation is effective, the area score of the space magnetic field rotation on the surface of the shell is calculated, and when the time change gradient exceeds a preset threshold value, the tripping action is triggered, the shielding effect of shell eddy current on weak electric leakage signals is broken through, and high-sensitivity electric leakage protection is realized while the explosion-proof integrity is maintained.

The invention provides an infrared shielding flexible composite phase change film and a preparation method thereof. The composite phase change film is a flexible composite film material synthesized by taking a cellulose acetate porous film as a framework and a phase change material as a core material and doping a high-reflectivity nanoparticle material. The preparation method of the composite phase change membrane comprises the following steps: forming pores by a phase inversion method, carrying out gravity settling to obtain a cellulose acetate porous membrane with low emissivity, and dipping to obtain the flexible composite phase change membrane. The prepared flexible composite phase change film is a bendable film with certain mechanical strength, the system has the infrared emissivity reducing performance and the temperature control performance, and the composite phase change material under the dual-mode function can efficiently achieve the infrared shielding effect.

The utility model discloses a protection box for high magnetic field chip test, which is used for installing a chip test carrier plate and comprises a shielding box body and an end cover, an accommodating cavity is arranged in the shielding box body, at least one end of the accommodating cavity is open, and the end cover is detachably and fixedly connected to one side of the opening of the accommodating cavity. The end cover is provided with a through groove corresponding to an opening of the containing cavity, the wall of the containing groove is provided with a clamping groove, the groove wall of the through groove is provided with a slot corresponding to the clamping groove, one end, provided with an electronic component, of the chip testing carrier plate penetrates through the slot and then is inserted into the clamping groove, and one end, provided with a chip to be tested, of the chip testing carrier plate is located outside the shielding box body. According to the protection box for the high-magnetic-field chip test, the magnetic shielding effect on the electronic components can be realized only by inserting the electronic components on the chip test carrier plate into the clamping grooves of the shielding box body in a matched manner, the operation is simple, the installation is convenient, and the test efficiency is greatly improved.

The invention particularly relates to a method for determining a magnetic shielding body material of an optical fiber ring, and solves the technical problems that the magnetic shielding effect is poor and the magnetic shielding performance requirement of an optical fiber gyroscope is difficult to meet due to the lack of an optimal selection method for a magnetic shielding body in the prior art. The invention discloses a method for determining a magnetic shielding body material of an optical fiber ring. The method comprises the following steps: 1) calculating relative permeability of each magnetic shielding material under different magnetic induction intensities; 2) establishing an optical fiber ring magnetic shielding simulation model; 3) simulating to obtain first magnetic induction intensity of a magnetic field environment where the optical fiber ring is located; 4) selecting the material of the magnetic shielding body on the outermost layer; and 5) performing simulation in sequence from outside to inside to obtain the magnetic induction intensity of the magnetic field environment where the optical fiber ring is located, and based on the magnetic induction intensity, selecting the magnetic shielding material with the highest relative magnetic conductivity in the multiple magnetic shielding materials in the step 1) in sequence as the material of the magnetic shielding body of the corresponding shielding layer until the material of each layer of magnetic shielding body in the optical fiber ring is determined.

The invention relates to an electric leakage suppression system for an alternating-current power system, and the system comprises a variable-frequency compensation control module which adjusts the frequency and signal amplitude in a circuit according to the equipotential characteristics of a power utilization loop of the power system, so as to match the load characteristics and achieve the dynamic fixation of the signal amplitude; the real-time monitoring module is used for monitoring the frequency, current and voltage of the power system; the central processing unit is used for processing data from the monitoring module, executing data analysis and identifying frequency and current changes under the condition of electric leakage or electric shock; and the electric leakage suppression module is connected with the real-time monitoring module, is provided with a mechanism which is automatically activated when frequency and current are detected to be abnormal, and is used for dynamically adjusting circuit response to suppress leakage current. And the modules are connected in parallel to the power utilization loop, perform rapid self-adaptive modified modulation compensation on the parallel frequency resonance of the load loop, and dynamically adjust the current phase and amplitude so as to realize the zero potential difference of the target load end and the current suppression on the target load, and form the suppression and shielding effects on the leakage of the circuit.

The invention discloses a ferromagnetic material internal defect leakage magnetic field increasing method based on alternating current and direct current composite magnetization, which comprises the following steps of: fixing a workpiece at the center of a composite exciting coil, and synchronously applying direct current and high-frequency alternating current; after pure direct current magnetization is saturated, current is locked, and a basic leakage magnetic field is established; the surface magnetic conductivity is dynamically reduced by overlapping alternating current, and the magnetic shielding effect is weakened; a leakage magnetic field signal is scanned and collected through a differential Hall sensor array, and background magnetic field deduction, peak value comparison and adaptive filtering processing are carried out; and determining an optimal magnetization parameter combination by adopting a gradient descent method and Bayesian optimization. The system is integrated with a composite excitation coil and a signal conditioning unit, so that synchronous excitation, signal acquisition and real-time analysis are realized. The leakage magnetic field signal at the deep defect is enhanced through alternating-current and direct-current composite magnetization, the problem of signal weakening caused by traditional direct-current saturation is solved, the defect detection sensitivity and efficiency are improved, and the method is suitable for non-destructive detection scenes of ferromagnetic materials.

The invention discloses a gear micro-texture current-assisted laser processing method and device. The method comprises the steps that a gear three-dimensional model is established, and a curved surface processing path is generated; a laser is controlled to emit laser, the gear space attitude is adjusted, a dynamic focus lens is controlled to adjust the focal length of a laser beam based on a curved surface machining path, an X-direction galvanometer and a Y-direction galvanometer are controlled to adjust the direction and angle of the laser beam, and a laser spot is focused on a to-be-machined area of the gear; meanwhile, high-frequency pulse current is applied to the to-be-machined area, and the current waveform is sine wave; and high-pressure airflow is jetted. The laser energy absorption rate of the gear surface is increased, the temperature field is homogenized, and the plasma shielding effect is weakened, so that the integrity and uniformity of the texture contour are improved, splashing and burrs are reduced, and the machining quality and efficiency are improved. And machining is suitable for the complex curved surface of the gear, high-precision and high-consistency micro-texture machining is achieved, and the requirements for lubrication, friction reduction and fatigue resistance of a high-end gear are met.

The invention belongs to the field of water electrolysis hydrogen production, and relates to a gradient pore structure electrode and a preparation method and application thereof.The preparation method comprises the following steps that 1, the surface of an electrode substrate is sequentially coated with polystyrene of different particle sizes, then low-temperature sintering is conducted, and the polystyrene is fixed to the surface of the electrode substrate; obtaining an electrode substrate fixed with a polystyrene molecular template; 2) electroplating a metal coating on the surface of the electrode substrate fixed with the polystyrene molecular template by adopting a chemical plating method to obtain the electrode substrate which contains the metal coating and is fixed with the polystyrene molecular template; and 3) carrying out template removal and metal substrate removal treatment on the electrode substrate which contains the metal coating and is fixed with the polystyrene molecular template obtained in the step 2) to obtain the gradient pore structure electrode. An efficient three-phase reaction interface is constructed through the gradient holes, the bubble shielding effect is reduced, the overpotential and the water electrolysis energy consumption are reduced, and the water electrolysis hydrogen production efficiency is improved.

The invention relates to the technical field of plasma sources, in particular to a self-shielding inductively coupled plasma radio frequency electrode and plasma processing equipment. The device at least comprises a spiral inductance coil, a middle shielding electrode and a grounding capacitor, wherein the spiral inductance coil is used for transmitting radio frequency energy to a plasma excitation area in an inductive coupling mode; the middle shielding electrode is connected to the middle coil part of the spiral inductance coil and used for shielding high-voltage areas at the upper end and the lower end of the spiral inductance coil; the grounding capacitor is used for adjusting the voltage in the middle of the spiral inductance coil, so that the voltage amplitude of the position where the middle shielding electrode is located is reduced to the lowest point, and the self-shielding effect is achieved. According to the invention, the electric field of a high-voltage area of the coil is effectively shielded, the capacitive coupling effect is obviously reduced, the problems of particle pollution, shortened equipment life, ion damage and the like of a traditional plasma source in a wafer processing process are solved, and the system stability and the process reliability are improved.

The invention discloses an electromagnetic shielding case formed based on ultrafast laser plasma, and the electromagnetic shielding case comprises an ultrafast laser which is used for emitting ultrafast laser; the phase modulation element is used for carrying out annular modulation on the phase of the ultrafast laser to enable the cross section of a light beam to be in an annular shape; and the focusing device is used for pre-focusing the annular modulation light emitted by the phase modulation element in air to form a hollow cylindrical plasma cylinder, and the plasma cylinder is used for being nested at the periphery of equipment to be shielded so as to realize a signal shielding effect. Therefore, the generation and dissipation process of the ultrafast laser plasma is very rapid and can be completed on the nanosecond-level time scale, rapid response to electromagnetic waves can be achieved, and the method is suitable for occasions where the shielding effect needs to be dynamically adjusted.

The invention relates to a moderator of a compact single-ball neutron spectrometer, and the moderator is characterized in that an inner layer is of a cylindrical structure, and a plurality of thermal neutron detectors are installed in the inner layer; the thermal neutron absorption layer sleeves the outer side of the inner layer and is made of boron-containing polyethylene; the scattered neutron moderation layer sleeves the outer side of the thermal neutron absorption layer; the inner layer comprises a detector placing block and a thermal neutron absorption block, and the thermal neutron absorption block is provided with a storage groove; a plurality of thermal neutron detectors are placed in the detector placement block along the axis direction, the first thermal neutron detector is placed in the storage groove, and the thermal neutron absorption block is made of boron-containing polyethylene; the diameter of the inner layer is 8 cm, the outer diameter of the thermal neutron absorption layer is 14 cm, and the outer diameter of the scattered neutron moderation layer is 20 cm. The purposes that the size is controlled by controlling the diameter of the cylindrical structure and the scattering shielding effect is enhanced by arranging the three layers of moderator structures in a sleeving mode are achieved, and therefore the technical effects that the moderator is small in size, convenient to transport and high in scattering shielding effect are achieved.

The invention discloses a nuclear accident dynamic safe operation time assessment method and system based on data fusion, relates to the technical field of nuclear radiation protection, and solves the technical problems that the safe operation time is not accurate enough and dynamic dose assessment is difficult in nuclear accident emergency response. According to the technical scheme, nuclear accident prediction data and site real-time monitoring data are fused, a data assimilation fusion algorithm and an intelligent analysis model are combined, the radiation dose and environmental conditions of an accident site are comprehensively evaluated, and safety operation time and risk levels of different areas are dynamically calculated and updated; by considering the building shielding effect and supporting the federated learning framework, the cooperative evaluation of multiple monitoring points is realized, so that the operation time evaluation precision and decision-making efficiency in the nuclear accident emergency response are greatly improved. Finally, operation suggestions can be fed back and updated in real time, and the real-time performance and accuracy of emergency command decisions are ensured.

The utility model relates to a mounting structure of PCB board large current conductor, this mounting structure includes metal base, PCB board, large current conductor and upper shell, the recessed groove for the large current conductor inlay is integrally arranged on the metal base, the PCB board sets up on the upper surface of metal base, the utility model discloses through embedding the large current conductor on the PCB board into the recessed groove inside the metal base, realizes the all -round metal surrounding and shielding of large current conductor, effectively avoids the electric field, magnetic field signal radiation to outside of the current on the large current conductor, realizes better EMC shielding effect.

The invention discloses a photoconductive antenna for reducing a space charge shielding effect, relates to a terahertz transmission technology, and provides a scheme for solving the problems of overhigh shielding voltage and the like in the prior art. The structure comprises a photoconductive substrate, a first electrode arranged on one side of the upper end face of the photoconductive substrate, and a second electrode arranged on the other side of the upper end face of the photoconductive substrate. A gap nano metal array is arranged between the first electrode and the second electrode; the gap nano metal array comprises unit cells which are distributed in an array; the metal sheets in the unit unit cells and / or between the unit unit cells excite local plasmon polaritons to enhance the light field intensity of corresponding areas when irradiated by incident laser. The terahertz photoconductive antenna has the advantages that the nanometer array structure is introduced, a high radiation enhancement area is generated through metal plasmon coupling, the terahertz photoconductive antenna obtains better radiation characteristics, meanwhile, the nanometer array structure is structurally optimized, the distribution condition of carriers in the photoconductive antenna is improved, and space charge shielding voltage is effectively reduced.

The application relates to the field of wastewater treatment catalysis, and discloses a Fe-Cu-Mn ternary hydrotalcite-like catalyst and a preparation method thereof, which comprises iron, copper and manganese; the iron, copper and manganese are distributed in the layer plate metal central site in an atomic dispersion mode; the layer plate oxygen octahedron is in a non-symmetrical stretching distortion state; a 3.2-4.8 degree deviation is generated in the manganese oxygen copper bond angle in the layer plate; the lattice parameter a of the layer plate 110 crystal face direction is 0.305-0.312 nm; the molar ratio of copper to manganese is 1:2-1:5; and the molar sum of copper and manganese to the molar ratio of iron is 2:1-4:1. According to the application, the lattice non-symmetrical distortion induces the space overlap of the auxiliary metal and the iron active center orbit, an electron transfer path is constructed, the shielding effect of the hydroxyl ion on the iron active site under the alkaline environment is eliminated, the catalytic site activity is maintained, and stable and efficient catalytic treatment under wide pH working conditions is realized.

A dual-mode asymmetric P-I-N perovskite radiation detector and its fabrication method are disclosed, belonging to the field of radiation detector technology. The method first involves preparing a perovskite single-crystal precursor solution. A small amount of this solution is used for seed crystal growth at a constant temperature, with the seed crystal serving as the seed for CsPbBr3 single-crystal growth on a P-type substrate. Next, a MAPbBr3 solution is prepared, and MAPbBr3 single crystals are grown to form the I layer. Finally, MAPbBr3 (Bi) is prepared... 3+ A doped solution was used to grow MAPbBr3 (Bi) as the N-layer. 3+ A dual-mode asymmetric P-I-N perovskite radiation detector is obtained by fabricating top and bottom electrodes using a doped single crystal. This invention utilizes the forward conduction and reverse cutoff characteristics of the P-I-N structure. When a negative voltage is applied to the N layer for forward bias, X-rays incident on the P layer are used for radiation detection, exciting the photoconductivity gain and achieving a sensitivity far exceeding that of CsPbBr3 single crystals; simultaneously, MAPbBr3 (Bi 3+ The doped single crystal has a natural shielding effect on soft X-rays, enabling high-sensitivity detection of hard X-rays in the I layer when X-rays are incident on the N layer with positive pressure and reverse P-I-N bias.

The invention provides a reflective polarized brightness enhancement film capable of replacing a diffusion plate and a preparation method of the reflective polarized brightness enhancement film, and relates to the technical field of optical thin films. According to the reflective polarization brightness enhancement film, through the three-layer integrated design of the upper reflective polarization composite film, the middle micro-scattering dodging layer and the lower strong-scattering shielding layer, the reflective polarization brightness enhancement film can directly replace an independently-arranged diffusion plate in a liquid crystal display backlight module. Experiments prove that the reflective polarized brightness enhancement film disclosed by the invention has a relatively good shielding effect while keeping relatively high brightness. Besides, the reflection type polarized light brightness enhancement film can directly replace an independently-arranged diffusion plate in the liquid crystal display backlight module, the thickness of the backlight module can be reduced, the weight can be reduced, the material and assembly cost can be reduced, and light, thin and low-cost display product design can be achieved.

The invention discloses a hollow microsphere with electromagnetic absorption performance and a preparation method and application thereof. Each hollow microsphere structurally comprises a glass hollow microsphere and a metal layer coated on the glass hollow microsphere, and the metal layer is made of nickel; the solid nickel sulfide particles are embedded in the metal layer, and the nickel sulfide particles are at least partially exposed on the outer surface of the metal layer. When being used as a wave-absorbing material (wave-absorbing agent), the hollow microspheres provided by the invention have low density, good structural stability and excellent microwave absorbing and shielding effects.

The invention relates to the technical field of communication transmission devices, and particularly discloses a communication transmission interface assembly which comprises a transmission unit, the tail end of the transmission unit is exposed out of a plastic part, the transmission unit is provided with an interface cavity, the interface cavity is configured to be used for being connected with external equipment in an inserted mode, and the communication transmission interface assembly further comprises an outer covering part. The plastic part is coated with the outer covering part, and the outer covering part is fixedly connected to the transmission unit. According to the arrangement, the outer covering part is additionally arranged to wrap the exposed plastic part, the shielding effect is achieved, the influence of external interference on signal transmission is blocked, meanwhile, internal signal radiation is prevented from interfering other devices, the outer covering part serves as a shielding layer, attenuation and crosstalk of transmission signals can be reduced, transmission stability is ensured, meanwhile, the outer covering part can play an isolation role, and the service life of the device is prolonged. Related devices in the transmission unit are protected from mechanical stress such as extrusion, friction and vibration, the protection performance is improved, the service life is prolonged, and the durability and safety of signal transmission are effectively improved.

The application belongs to the field of new materials, and discloses a lead-free perovskite X-ray shielding composite material and a preparation method and application thereof, and comprises the following steps: mixing ANF / DMSO dispersion liquid with ethanol to obtain re-protonated ANF dispersion liquid; mixing the re-protonated ANF dispersion liquid, CsI powder and ethanol, and stirring to obtain two portions of the same CsI / ANF dispersion liquid; mixing re-protonated ANF, Cs3Bi2I9 powder and ethanol, and stirring to obtain Cs3Bi2I9 / ANF dispersion liquid; sequentially filtering the first portion of CsI / ANF dispersion liquid, the Cs3Bi2I9 / ANF dispersion liquid and the second portion of CsI / ANF dispersion liquid by using a gel-gel method, and vacuum hot-pressing to obtain a composite gradient film with a biomimetic symmetrical structure, which is used as a lead-free perovskite X-ray shielding composite material; and the application realizes continuous and efficient X-ray shielding effect, and can improve the mechanical flexibility and thermal stability of the material.

The present disclosure discloses a wire filling welding method in a high pressure environment, comprising: S100: pretreating a workpiece to be welded, a welding wire and a target material; S200: arranging relative positions of the workpiece to be welded, the welding wire and the target material according to welding requirements; S300: heating and melting the welding wire by using a plasma as a heat source; and S400: forming a weld seam of the workpiece to be welded by using the heated and melted welding wire. The present disclosure uses the plasma as the heat source to perform welding, which can effectively avoid the shielding effect of the plasma on the laser in the high pressure environment, thereby improving the utilization rate of the laser energy.