497results about How to "Inhibited Diffusion" patented technology

The invention, which relates to the technical field of data security monitoring, discloses a network data risk assessment system for a computer, comprising a data monitoring platform. The data monitoring platform is in communication connection with a data acquisition module, a data preprocessing module, an anomaly detection module, a threat evaluation module, an automatic alarm module, a response strategy generation module and a report generation module, and all the modules are in electric signal connection. According to the network data risk assessment system for the computer, the functions of anomaly detection, threat assessment, response strategy generation and automatic alarm are integrated, rapid detection and response to network threats are achieved, abnormal mode recognition is conducted through the machine learning technology, potential security threats are found, the recognition accuracy of abnormal behaviors is improved, and in addition, the network data risk assessment system for the computer has the advantages of being high in practicability and easy to popularize. And preset protection measures are automatically triggered, so that quick response is realized when high-risk threats are detected, and the damage of security incidents to the system is reduced.

The invention provides an intelligent runoff pollution monitoring and response method and system, and the method comprises the steps: arranging a plurality of monitoring points in a runoff region, collecting water quality, hydrological and meteorological data in real time through a sensor, transmitting the data to a data processing center through a wireless network, carrying out the preprocessing, storage and analysis, and calculating the comprehensive pollution index of each monitoring point. And comparing with a set index threshold value. When the comprehensive pollution index exceeds a threshold value, the system identifies and evaluates key water quality parameters so as to determine a reasonable parameter threshold value; once data of a monitoring point exceeds a preset pollution threshold value, an alarm mechanism is triggered, then a pipe network water flow model and a geographic information system are combined to reversely track a pollution path, accurately position a pollution source and provide a basis for pollution control, and the process comprises the steps of screening suspected pollution source nodes, calculating a propagation path probability and preferentially checking a high-probability path. The traced pollution source or path probability is lower than a preset value.

The present invention relates to the technical field of photovoltaic power equipment, and discloses a photovoltaic grid-connected cabinet, including a cabinet support and an outer shell, wherein a plurality of breathing plates are fixedly installed inside the cabinet support, and the plurality of breathing plates divide the inner cavity of the cabinet support into different installation chambers, and the breathing plate includes a base plate and a plurality of heat-conducting blocks, wherein the plurality of heat-conducting blocks are embedded in the inner surface of the base plate, and a flow guide pipe is embedded inside the base plate, and the flow guide pipe passes through the heat-conducting block and is fixedly connected, and a plurality of heat-conducting blocks are connected in series, and a breathing cavity is opened inside the heat-conducting block. The photovoltaic grid-connected cabinet adopts a breathing plate as a cabinet partition, and the opening and closing of the breathing cavity can be adjusted by controlling the expansion and contraction of a telescopic ball, so that the grid-connected cabinet not only has the function of blocking external dust and high temperature, but also has the function of one-way ventilation and heat dissipation. Since a monitoring component is arranged inside the breathing plate, the grid-connected cabinet has the function of discharging internal hot air nearby, reducing heat dissipation energy consumption, and being more environmentally friendly.

The invention provides a solid electrolyte for a lithium battery and a preparation method and application thereof, and belongs to the technical field of solid electrolytes.The solid electrolyte is prepared from, by mass, 40-75 parts of lithium salt, 10-30 parts of cross-linking agent, 5-25 parts of nanoscale silicon borate glass fiber and 1-10 parts of photoinitiator. The lithium salt, the cross-linking agent, the nanoscale silicon borate glass fiber and the photoinitiator are adopted as raw materials, a polymer component formed after ultraviolet curing has high mechanical performance, a stable electrolyte-electrode interface can be formed, growth of lithium dendrites can be effectively inhibited, the risk of short circuit of the battery is reduced, and the service life of the battery is prolonged. Therefore, the overall safety of the battery is improved, and the service life of the battery is prolonged. As an inorganic filler, the nanoscale silicon borate glass fiber is beneficial to reducing the crystallinity of a polymer component and increasing an amorphous phase region, so that rapid migration of lithium ions is facilitated, and the ionic conductivity and coulombic efficiency of the battery are improved.

The invention discloses a method for improving the strength and long-term service performance of a brazed joint in a skutterudite thermoelectric device by using a cobalt-based barrier layer, and belongs to the technical field of thermoelectric material connection. The problems that the long-term service performance of existing skutterudite and electrode brazing is poor, and the strength of a brazed joint is low are solved. The cobalt-based barrier layer added between the skutterudite and the electrode is cobalt and the refractory metal, and the refractory metal is high in melting point, bond energy and diffusion activation energy, so that diffusion of the Sb element through the barrier layer to the electrode is inhibited, and the components of the cobalt-based barrier layer can be flexibly adjusted, so that the thermal expansion coefficient of the barrier layer is easily matched with that of the skutterudite. The barrier layer powder and the skutterudite powder are subjected to integrated hot pressed sintering, and staggered interfaces are formed between the powder and the powder; and the interface stress can be well relieved. Due to the fact that the barrier layer contains fewer grain boundaries, diffusion of the Sb element can be better restrained. The shearing strength of the obtained brazed joint of skutterudite and the electrode reaches 33.6 MPa.

A greenhouse environment control and field management integrated system comprises an irrigation system, an aerial fog system, a conveying pipeline and a sensing control system. According to the utility model, various agricultural production management such as irrigation, pesticide application, ventilation, heating, dehumidification, cooling and the like can be carried out according to the growth requirements of crops, a frame is provided for hanging vine crops such as tomatoes, cucumbers and the like for supporting, and meanwhile, wind power can be provided for solanaceous crops for pollination. The system is high in integration level and rich in function, the greenhouse space can be effectively saved, the crop production efficiency is improved, the labor amount in the production process is reduced, and help is provided for intelligent management and control of facility agriculture.

The invention discloses a preparation method of a Bi / Bi4NbO8X piezoelectric photocatalyst with an amorphous crystal interface. The preparation method comprises the following steps: sequentially adding Bi2O3, Nb2O5, BiOX (X is Cl or Br), NaX and LiX into deionized water according to a ratio, stirring for a certain time at 0 DEG C, putting the mixture into a tubular furnace, calcining to obtain a Bi4NbO8Xl precursor material, and dissolving the precursor material into an ethylene glycol solution to obtain the electrolyte. FTO is used as a working electrode, a graphite rod is used as a counter electrode, a saturated calomel electrode is used as a reference electrode, constant current deposition is carried out at room temperature for a certain time, precipitates are collected and washed with deionized water and absolute ethyl alcohol, and centrifugation and drying are carried out. According to the preparation method, amorphization of a matrix is successfully induced, an amorphous / crystalline interface is formed, meanwhile, Bi metal is separated out in situ, and a Bi / Bi4NbO8X (X is Cl or Br) heterostructure is formed. The formation of an amorphous / crystalline interface and a Bi / Bi4NbO8X (X = Cl, Br) heterostructure effectively promotes the separation efficiency of photo-generated charges, so that the catalyst realizes efficient tetracycline (TC) degradation capacity.

The invention discloses high-toughness low-swelling ionic conductive hydrogel and a preparation method and application thereof, and belongs to the technical field of polymer hydrogel, and the preparation method comprises the following steps: dissolving acrylic acid, acrylamide, phytic acid and sodium carboxymethyl cellulose in deionized water, and uniformly mixing to obtain a precursor solution; removing bubbles in the precursor solution to prepare a bubble-removed precursor solution; adding an initiator and a cross-linking agent into the bubble-removed precursor solution, and stirring until the initiator and the cross-linking agent are completely dissolved to obtain a pre-polymerized solution; and carrying out free radical polymerization on the pre-polymerized solution under a preset condition to obtain the high-toughness and low-swelling ionic conductive hydrogel. Through the synergistic enhancement effect of phytic acid and carboxymethyl cellulose, the multifunctional ionic conductive hydrogel is developed, and the hydrogel has excellent mechanical properties, can realize low swelling in water and artificial seawater, and also has good conductivity. The preparation method is simple, controllable in operation and easy for industrial production.

The invention relates to a SiOC modified boron carbide-aluminum oxide composite material and a preparation method thereof. The SiOC modified boron carbide-aluminum oxide composite material comprises a porous structure boron carbide-aluminum oxide material and a SiOC layer coating and modifying the porous structure of the boron carbide-aluminum oxide material and the surfaces of boron carbide and aluminum oxide particles, the porosity of the boron carbide-aluminum oxide material with the porous structure is 20 to 40 percent.

The invention discloses a large-size high-performance R-T-B rare earth permanent magnet and a preparation method thereof. The thickness of the magnet in the orientation direction is 4-14 mm; the residual magnetism Br of the large-size high-performance magnet is greater than or equal to 14.0 kGs, and the coercive force Hcj is greater than or equal to 23.0 kOe. When the magnet base body is prepared, a layered powder laying mode is adopted, so that the surface layer of the magnet is made of single alloy easy to diffuse, the core part of the magnet is made of double alloy, it is guaranteed that the core part of the magnet has high coercive force, meanwhile, the grain boundary diffusion capacity of the surface layer of the magnet is optimized, and the advantages of the double alloy and grain boundary diffusion are fully combined. Besides, an alloy of a low-melting-point metal element M2 and a heavy rare earth element RH in a certain proportion is adopted as an auxiliary alloy and a grain boundary diffusion source, the diffusion depth of the heavy rare earth element RH is promoted, excessive enrichment of the heavy rare earth element RH in a small area is prevented, and generation of body diffusion is inhibited. According to the method, the coercive force of the magnet is remarkably improved, meanwhile, it is guaranteed that the magnet has high residual magnetism, and the large-size high-performance R-T-B rare earth permanent magnet is prepared.

The utility model discloses a construction waste treatment device which comprises a treatment box and a feeding frame arranged at the top of the treatment box, crushing rods are rotationally connected to the two sides of the rear portion of an inner cavity of the treatment box through bearings, and one end of each crushing rod penetrates through the treatment box and extends out of the treatment box. A smashing cylinder is fixedly connected to the outer surface of the smashing rod and located in the treatment box, a plurality of smashing discs are fixedly connected to the outer surface of the smashing cylinder, and a driving mechanism is arranged on the front portion of the treatment box. According to the device disclosed by the utility model, the two rotating cylinders at the upper part are driven by the belt pulley to drive the rotating plate to rotate relatively, so that the feeding hole is shielded, dust generated by crushing is effectively prevented from diffusing, and the rotating plate rotates to generate downward airflow, so that the dust can be better prevented from diffusing; and the device is provided with a lower electromagnetic rod, so that metal in the garbage is conveniently adsorbed out, secondary classification of the construction garbage is not needed, and more time and labor are saved.

The invention relates to the technical field of LEDs, in particular to a red light LED epitaxial wafer and a preparation method thereof. The red light LED epitaxial wafer sequentially comprises a GaAs substrate, a GaAs buffer layer, an anti-oxidation DBR reflecting layer, an N-type limiting layer, an N-surface micro-strain layer, an N-side space layer, a multi-quantum well active layer, a P-side space layer, a P-surface micro-strain layer, a P-type circulating doping limiting layer, a P-type transition layer and a P-type window layer from bottom to top. According to the invention, the conventional DBR reflecting layer material is adjusted into the antioxidant DBR reflecting layer, and the Al0. 5In0. 5P: C / Al0. 5In0. 5P: Mg periodic cycle doping structure and the like are introduced into the P-type limiting layer, so that the problems of luminous efficiency attenuation, brightness attenuation and the like of a conventional red light LED in a high-temperature and high-humidity environment or under the condition of large current can be effectively solved, and the obtained red light LED epitaxial wafer is good in luminous efficiency stability, high in reliability and wide in applicability.

A gradient multilayer nano Ti (C, N)-based metal ceramic and a preparation method thereof relate to the field of powder metallurgy, and the method comprises the following steps: S1, mixing 64.9% by mass of titanium carbonitride, 23% by mass of tungsten carbide, 8% by mass of cobalt, 4% by mass of molybdenum carbide and 0.1% by mass of graphene nanosheets to obtain mixed powder I; mixing 60.9% of titanium carbonitride, 23% of tungsten carbide, 8% of cobalt, 8% of molybdenum carbide and 0.1% of graphene nanosheets to obtain mixed powder II; and S2, the mixed powder I and the mixed powder II are added into a mold layer by layer, three layers of mixed powder with the surface layer being the mixed powder II layer and the core layer being the mixed powder I layer are obtained, spark plasma sintering is carried out, and the gradient multi-layer nano Ti (C, N)-based metal ceramic is obtained. According to the Ti (C, N)-based metal ceramic and the preparation method thereof, different molybdenum carbide mass proportions of the surface layer and the core layer are controlled, a hard phase enrichment area is formed on the surface layer, a binding phase enrichment area is formed on the inner core part, the Vickers hardness can be improved through hard phase enrichment, the fracture toughness can be improved through binding phase enrichment, and therefore the Ti (C, N)-based metal ceramic with the hardness and the fracture toughness is obtained.

The invention relates to the technical field of coated cutters, and provides a cutting tool with a high-hardness self-lubricating coating and a preparation method of the cutting tool. The cutting tool comprises a tool base body and the coating formed on the tool base body; the coating is of a multi-layer structure and sequentially comprises a first sub-coating, a first gradient layer, a second sub-coating, a second gradient layer and a third sub-coating from inside to outside. The content of Si in the first gradient layer is increased in a gradient mode from inside to outside and is not higher than the content of Si in the second sub-coating; the content of B in the second gradient layer is increased in a gradient mode from inside to outside and is not higher than the content of B in the third sub-coating.

The invention provides a long-service-life magnesium-aluminum-carbon ladle wall brick for a steel ladle and a preparation method of the long-service-life magnesium-aluminum-carbon ladle wall brick. The long-service-life magnesium-aluminum-carbon ladle wall brick comprises the following raw materials in percentage by mass: 29%-63% of waste magnesium-aluminum-carbon bricks, 10%-20% of waste magnesium-carbon bricks, 10%-25% of fused magnesite, 2%-5% of white corundum, 3%-5% of alpha-alumina micro powder, 3% of liquid phenolic resin, 1%-3% of fused magnesite dust removal powder, 0.1%-3% of a CeSi2-SiC multiphase material and 1%-3% of high-temperature asphalt. And 1%-5% of graphite. The long-life magnesium-aluminum-carbon ladle wall brick prepared by the method has the advantages of favorable oxidation resistance, favorable molten steel scouring resistance, high thermal shock resistance, long service life and excellent use effect.

The invention relates to the technical field of fire detection equipment, in particular to an energy storage power station composite fire detection device which comprises a mounting base, a water spraying pipeline is arranged in the middle of the mounting base, a conical shell is arranged in the middle of the water spraying pipeline, and a conical body capable of sealing the water spraying pipeline is arranged in the conical shell. A plurality of smoke suction mechanisms capable of sucking smoke in a fire scene are arranged on the peripheral side in the conical shell, a water curtain forming mechanism capable of forming a water curtain barrier in the fire scene is arranged at the bottom of the conical shell, and air suction control mechanisms in the smoke suction mechanisms utilize the deformation characteristic of bimetallic strips when the temperature rises. The opening and closing of an air inlet hole are automatically controlled, so that fire scene smoke is accurately sucked, the water curtain forming mechanism flexibly adjusts the size of a water curtain jet orifice according to the working state of the device through the cooperation between an upper sliding shell and a lower flow guide disc, and an effective water curtain barrier is formed in a fire scene.

The invention provides a foam dust suppression material as well as a preparation method and application thereof. The foam dust suppression material comprises a foaming agent, a surfactant, a thickening agent, inorganic salt and a solvent; wherein the foaming agent comprises soybean protein isolate and / or collagen; the surfactant comprises an anionic surfactant and / or a nonionic surfactant; the inorganic salt comprises one or more of potassium sulfate, magnesium chloride, sodium sulfate and sodium chloride. According to the foam dust suppression material, specific components are adopted, all the components cooperate with one another, and the dust suppression material is high in foaming rate, good in stability, good in dust suppression effect, environmentally friendly, non-toxic to the human body, capable of protecting the health of workers and improving the comfort level of the working environment, low in cost and good in economic benefit and social benefit.

The invention belongs to the technical field of solid-state lithium metal batteries, and discloses an amorphous inorganic ion conductor and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing lithium tetrachloroaluminate and sodium tetrachloroaluminate to obtain a mixture; and melting the mixture to obtain a molten precursor, and cooling the molten precursor to room temperature to obtain the amorphous inorganic lithium ion conductor Li < x > Na < 1-x > AlCl4, x being greater than or equal to 0.15 and less than or equal to 0.85, wherein the amorphous inorganic lithium ion conductor Li < x > Na < 1-x > AlCl4 is used as an interface phase between a positive electrode of a solid-state lithium metal battery and a solid-state electrolyte. The amorphous LixNa1-xAlCl4 has the remarkable advantages that the preparation temperature is low, the crystal structure of the product can be controlled, the ionic conductivity of the product is high, and the compatibility with a solid electrolyte and a positive electrode material is good. The method is short in preparation period, low in cost and suitable for industrial application.

The invention discloses an easy-to-tear high-barrier film, which belongs to the technical field of film packaging, and comprises a base material layer, a binder and a barrier layer from top to bottom, the barrier layer is prepared from the following raw materials in parts by weight: 70 to 90 parts of ethylene-vinyl alcohol copolymer, 5 to 15 parts of modified hexagonal boron nitride, 5 to 8 parts of plasticizer, 1 to 2 parts of lubricant and 0.05 to 2 parts of antioxidant. The prepared high-barrier film is a barrier layer prepared by taking an ethylene-vinyl alcohol copolymer as a main raw material and adding modified hexagonal boron nitride, a plasticizer, a lubricant and an antioxidant, and then the barrier layer is compounded with a base material layer and a binder, so that the high-barrier film with excellent tensile strength and elongation at break is obtained, meanwhile, the oxygen permeability is obviously reduced, and the service life of the high-barrier film is prolonged. And the film also has a certain antibacterial effect, can be widely applied to the fields of food packaging, medical packaging and the like, and has extremely high application value.

The invention provides a high-nickel positive electrode material and a preparation method and application thereof. The high-nickel positive electrode material can effectively control the overall Co content of the secondary particles so as to avoid the situation that the overall Co content of the secondary particles is too high, consequently, the gram volume of a lithium ion battery is reduced, and then the energy density is affected, permeation and diffusion of an electrolyte can be effectively inhibited, corrosion of the electrolyte to the interior of the high-nickel positive electrode material is resisted, and the service life of the high-nickel positive electrode material is prolonged. And the electrolyte is prevented from reacting with active substances in the high-nickel positive electrode material, so that the structural stability of the high-nickel positive electrode material is improved, and the cycle performance of the lithium ion battery is finally improved.

The invention discloses a preparation method and application of a flame-retardant coating, and relates to the technical field of flame-retardant coatings for special papers.The flame-retardant coating is prepared from, by weight, 80-85 parts of flame-retardant pigment and 15-20 parts of heat insulation pigment; the total weight of the components is set as M, the adhesive accounts for 8-15% M, the co-adhesive accounts for 7-9% M, the thickening agent accounts for 1-2% M, the lubricant accounts for 0.6-1% M, the water repellent agent accounts for 0.5-0.8% M, the defoaming agent accounts for 0.1-0.2% M, and the dispersing agent accounts for 0.2-0.3% M. The flame-retardant coating is designed and prepared, and the tipping base paper which can be carbonized at high temperature and does not burn is prepared by coating the surface of the tipping base paper. The preparation method is simple in process and high in operability, the defects of a direct papermaking method and an in-pulp addition method are overcome, the production efficiency and the resource utilization rate are improved, and the production cost is reduced. The flame-retardant tipping base paper is prepared by a coating method instead of a traditional in-pulp addition method, and a functional coating is selected and designed, so that the coating process flow and parameters are determined. The flame-retardant coating prepared by the invention endows tipping base paper with excellent high-temperature carbonization and non-combustion performance, and the flame safety performance of the tipping base paper is effectively improved.

The invention relates to the technical field of organic fertilizers, and discloses a preparation method of a water-retaining slow-release bio-organic fertilizer, which is characterized in that water-retaining material powder is prepared from nano silicon dioxide, gamma-methacryloxypropyltrimethoxysilane, acrylic acid, attapulgite and the like as raw materials. The preparation method comprises the following steps: blending furfural residues and pig manure biogas residues into a mixed matrix according to a certain proportion, adding a microbial decomposition bacterium agent, nitrogen-fixing bacteria, phosphate solubilizing bacteria and the like into the mixed matrix, fermenting, crushing, drying and sieving to obtain bio-organic fertilizer particles. The water-retaining slow-release bio-organic fertilizer is obtained by taking the bentonite as an inner core carrier, taking a bentonite slow-release material as an inner coating film and taking water-retaining material powder as an outer coating film through a rotary drum coating process, and the prepared bio-organic fertilizer has relatively good water-retaining performance and slow-release performance.

The filtering device comprises a heating ventilation air conditioner air supply shell, a driving assembly is arranged at the top of the heating ventilation air conditioner air supply shell, a rotating shaft is arranged in the heating ventilation air conditioner air supply shell through the driving assembly, and a mounting frame is mounted on the surface of the rotating shaft through a bearing; and the mounting frame is mounted in the heating ventilation air conditioner air supply shell. The connecting shaft drives the positions of the filter screens on the upper side and the lower side to be exchanged through the rotating plate, so that the blocked filter screen rotates to the lower portion, the unused filter screen is located on the upper portion, the blocked filter screen can be replaced, and meanwhile when the filter screens are replaced, the heating ventilation air conditioner can still be used; the situation that the air inlet amount is smaller than the air outlet amount due to blockage of the filter screen is avoided, and therefore the situation that external air enters a room through gaps due to the pressure difference between the indoor space and the outdoor space is avoided, and the situation that the heating ventilation air conditioner needs to be stopped to replace the filter screen is avoided.

The invention discloses a deep-sea mining plume inhibition technology using an AUV (Autonomous Underwater Vehicle) to add a flocculating agent, which comprises a mine car, a solution mixing container is arranged in the mine car, a stirrer is arranged on the solution mixing container, a second flow pump is arranged on the left side of the solution mixing container, and one end of the second flow pump is connected with the solution mixing container through a conveying pipeline; the other end of the solution mixing container is connected with a water pumping pipeline through a conveying pipeline; a jet flow pump is arranged on the left side of the solution mixing container; a flocculating agent is accurately added through the AUV, aggregation and sedimentation of suspended particulate matter are promoted, formation and diffusion of plume are effectively inhibited, pollution of deep-sea mining to the marine environment is reduced, the AUV can conduct autonomous navigation and control operation underwater, the system can adapt to the complex deep-sea environment, and the service life of the system is prolonged. The application scene of the technology is wide, the flocculant can be used for reducing plume generation, the drag reducer can also be used for reducing water jet resistance, and the mining efficiency is improved.

The invention provides a solar cell, a preparation method thereof and a photovoltaic module. The solar cell includes: a substrate; the first tunneling oxide layer is located on the surface of one side of the substrate; the first phosphorus doped layer is located on the surface of one side, far away from the substrate, of the first tunneling oxide layer; the second tunneling oxide layer is located on the surface of the side, away from the first tunneling oxide layer, of the first phosphorus-doped layer; the second phosphorus-doped layer is located on the surface of one side, far away from the first phosphorus-doped layer, of the second tunneling oxide layer; the third tunneling oxide layer is located on the surface of the side, away from the second tunneling oxide layer, of the second phosphorus-doped layer. The third phosphorus-doped layer is located on the surface of one side, far away from the second phosphorus-doped layer, of the third tunneling oxide layer; wherein the doping concentration of phosphorus in the first phosphorus-doped layer is smaller than the doping concentration of phosphorus in the second phosphorus-doped layer, and the doping concentration of phosphorus in the second phosphorus-doped layer is smaller than the doping concentration of phosphorus in the third phosphorus-doped layer. The solar cell has a good passivation effect.

The utility model discloses a flexibly grabbed waste sorting transfer robot, and relates to the technical field of medical recovery equipment, the flexibly grabbed waste sorting transfer robot is provided with a base, driving wheels, a sliding plate, a rotating seat, a first mechanical arm, a second mechanical arm, a third mechanical arm and a rotating head; a driving wheel can drive a base to move, a sliding plate can drive a driving seat and a rotating seat to move, the rotating seat, a first mechanical arm, a second mechanical arm and a third mechanical arm can accurately adjust the position of a rotating head, the rotating head is adjusted to the position above medical waste, and by arranging an electric cylinder, a fixing frame and a grabbing clamp, the position of the grabbing clamp can be accurately adjusted; single medical waste is flexibly grabbed, using is more flexible, meanwhile, a cleaning and disinfecting assembly is further arranged on the device, the grabbing clamp can be cleaned and disinfected, the surrounding environment can be disinfected, and growth and diffusion of bacteria are inhibited.

The invention discloses a flame-retardant and wear-resistant low-smoke halogen-free material and a preparation method thereof, and belongs to the technical field of polyacrylate processing.The preparation method comprises the following steps that cured polyacrylate, flame-retardant capsules and auxiliary materials are added into a double-screw extruder to be subjected to melt extrusion, and the flame-retardant and wear-resistant material is obtained; the flame-retardant capsule is prepared and cross-linked with a modified polyacrylate chain segment, so that the wear resistance of the material is remarkably enhanced, the material structure damage is repaired at room temperature, the shell layer is decomposed to release water at high temperature, and the shell layer and a core layer monomer are synergistically matched to form a flame-retardant layer; the prepared flame-retardant curing agent reacts with a flame-retardant polyacrylate chain segment to form a five-membered ring structure to enhance the wear resistance of the material, and the flame-retardant structure cooperates with flame-retardant groups on a flame-retardant capsule, a five-membered ring and an organic chain segment to enhance the flame retardance of the material.

The utility model provides an internal current-sharing trench gate silicon carbide VDMOS. The internal current-sharing trench gate silicon carbide VDMOS is characterized in that the lower side surface of a drift layer is connected to a silicon carbide substrate; the lower side of the buffer is connected to the upper side of the drift layer; the lower side surface of the well region is connected to the upper side surface of the buffer region; the lower side surface of the P-type source region is connected to the upper side surface of the well region; the lower side surface of the N-type source region is connected to the upper side surface of the well region; one side surface of the N-type source region is connected to one side surface of the P-type source region; the lower part of the gate dielectric layer is arranged in the groove, one side surface of the gate dielectric layer is connected to the other side surface of the N-type source region, and a groove is formed in the gate dielectric layer; the source metal layer is respectively connected with the P-type source region and the N-type source region; the gate metal layer is arranged in the groove; and the drain metal layer is connected to the lower side surface of the silicon carbide substrate, so that the overall on-resistance is lower, and the heat distribution is more uniform.

The invention belongs to the field of lithium-sulfur secondary batteries, and relates to a lithium-sulfur battery positive electrode and a preparation method thereof.The positive electrode active layer of the positive electrode comprises an active sulfur-graphene composite material, a conductive agent and polyvinylidene fluoride; the active sulfur is sublimed sulfur particles of which the surfaces are loaded with cerium single atoms. The cerium monatomic catalyst can form strong chemical bonding with polysulfide, and shuttling of the polysulfide can be effectively inhibited in cooperation with a physical barrier of graphene; the cerium has relatively high selective adsorption on long-chain polysulfide, the redox reaction energy barrier of the polysulfide is reduced, the utilization rate of sulfur is improved, the loss of active substances is reduced, and the coulombic efficiency, the cycle stability and the charge-discharge efficiency of the battery are improved; the conductivity of sulfur can be enhanced, rapid transmission of electrons in the whole electrode is promoted, and the rate capability of the battery is improved; meanwhile, cerium single atoms can form a stable coordination structure on the surface of sulfur, so that the volume expansion of sulfur in the charge-discharge process is limited, and the cycle life of the battery is prolonged.

The polishing device for copper wire production comprises a workbench and a polishing box fixedly connected to the top of the workbench, the two sides of the polishing box are both communicated with rotating cylinders, and the opposite sides of the two rotating cylinders are both fixedly connected with connecting plates; a plurality of polishing rings are fixedly connected between the opposite sides of the two connecting plates. The copper wire polishing device relates to the technical field of copper wire production. According to the polishing device for copper wire production, a copper wire penetrates through a plurality of polishing brushes, a motor drives a rotating rod to rotate, the rotating rod drives a rotating cylinder to rotate through a belt wheel and a conveying belt, the rotating cylinder drives a plurality of polishing rings to rotate through a connecting plate, and the polishing rings can drive the polishing brushes to rotate correspondingly; and the surfaces of the copper wires can be continuously polished through rotation of the multiple polishing brushes, the copper wires can be well polished, the surfaces of the copper wires are polished more completely, and the copper wire polishing effect is guaranteed.