81results about How to "Solving Dispersion Problems" patented technology

The invention relates to the technical field of data processing, and provides a question and answer method and system based on paragraph splitting and a knowledge engine platform, and the question and answer method comprises the steps: carrying out directory and title recognition on an uploaded document, and generating a paragraph frame structure with a hierarchical relationship of the document; splitting the text content of the document according to the paragraph frame structure to obtain a document paragraph structure dictionary containing the corresponding text content; according to the document paragraph structure dictionary, text blocks are generated, and a knowledge base is constructed; performing text block vectorization on the text block by adopting a text vectorization model to generate a sparse vector and a dense vector, and storing the sparse vector and the dense vector in a knowledge base; performing keyword extraction and text vectorization processing on the obtained question to obtain a keyword list, a sparse vector and a dense vector of the question; retrieving the knowledge base, and selecting a plurality of text blocks most similar to the problem; and based on the to-be-queried question, a preset cue word and a plurality of text blocks most similar to the question, obtaining a question answer by adopting the large model.

The invention provides a multi-source medical data fusion method and system, a medium and equipment. The multi-source medical data fusion method comprises the steps of collecting multi-modal data from different data sources; performing feature extraction on the acquired multi-modal data by adopting a deep learning model to obtain feature data of different modal data; fusing the feature data of the different modal data to obtain fused data; and adjusting fusion weights of different modal data so as to carry out data quality control on the fusion data. According to the system, through a multi-source data fusion technology, the problem that medical data are scattered and inconsistent is solved, and the comprehensive utilization value of the data and the accuracy of analysis are improved.

The invention discloses a preparation method of antibacterial warm-keeping graphene quantum dot cloud velvet, and relates to the technical field of cloud velvet. Single-layer graphene is prepared through a chemical method, then single-layer graphene quantum dots are prepared through an electrochemical reaction, the size reaches the nanometer level, the single-layer structure is sharper, and the sterilization effect can be improved; modification enables the surface to be rich in carboxyl and to be attached to cellulose to improve the agglomeration problem; secondly, breaking intermolecular hydrogen bonds of cellulose macromolecules by utilizing the strong action of ball milling and a polar solvent rich in hydroxyl and combining ultrasonic waves; then, the cellulose is combined with hydroxyl cardanol with a side chain containing a hydroxyl group, and cooperates with graphene quantum dots attached to the cellulose for efficient catalysis to generate active oxygen, so that the sterilization effect is achieved; then the modified nanocellulose is prepared into aerogel, and the aerogel is added into polyester as antibacterial master batch to prepare the cloud velvet, so that the warm keeping effect is improved. The cloud velvet prepared by the invention has antibacterial and warm-keeping effects.

The invention relates to the technical field of fuel cells, in particular to a preparation method of carbon fiber paper for a gas diffusion layer of a fuel cell. Comprising the following steps: adding phenolic resin, a dispersing agent, an anti-settling agent, asphalt and a graphitization template agent into a mixed solvent, and mixing and dispersing to prepare a resin impregnation liquid; and immersing the carbon fiber raw paper into the resin impregnation liquid for impregnation, drying, and then carrying out hot-pressing curing and graphitization treatment to obtain a final product. Part of phenolic resin is replaced with asphalt, a graphitization template agent is introduced, the graphitization temperature of the carbon fiber paper is reduced, the graphitization degree of resin carbon is improved, and the problems that asphalt and the graphitization template agent are difficult to disperse and easy to settle in phenolic resin impregnation liquid are solved by optimizing the formula of the resin impregnation liquid; according to the present invention, the asphalt, the phenolic resin and the graphitization template agent are loaded on the carbon paper body paper through the one-step impregnation, such that the advantages of simple process, low graphitization temperature and low energy consumption are provided, and the prepared carbon fiber paper has good conductivity.

The invention provides a boron nitride / epoxy resin heat-conducting composite material as well as a preparation method and application thereof. The boron nitride / epoxy resin heat-conducting composite material comprises the following raw material components: lignosulfonate; boron nitride; deionized water; a carboxymethyl nano cellulose solution; carboxylating the carbon nanotubes; borax; an epoxy resin; 1, 1, 2-cyclohexanedicarboxylic anhydride; the catalyst is 2, 2, 4, 6-tri (dimethylaminomethyl) phenol. The invention relates to a preparation method and application of a novel h-BN (boron nitride) composite material for thermal management, in particular to a three-dimensional vertical orientation composite material prepared by using lignosulfonate (LS) modified h-BN, cellulose nanofibers (C-CNF), carboxymethyl carbon nanotubes (C-CNT) and borax (B) as raw materials and adopting an ice template method. And the filler can be used as a novel enhanced heat conduction and electrical insulation filler in epoxy resin. According to the invention, BN is firstly modified, and surface modification is carried out on BN through sodium lignin sulfonate, so that compared with direct use of unmodified BN, the problem of poor compatibility and dispersibility of BN in the composite material is solved, and the heat-conducting property of the composite material is further improved.

The invention relates to the technical field of ceramic powder metallurgy, and discloses raw materials for in-situ generation of a core-shell structure ceramic core and a preparation method.The raw materials of the ceramic core comprise refractory material powder, zirconium silicate powder, fused corundum powder and nanometer aluminum oxide powder; the preparation method comprises the following steps: mixing refractory material powder, zirconium silicate powder, fused corundum powder and nano alumina powder in percentage by weight to form a ceramic core raw material, adding the ceramic core raw material into liquid paraffin to form ceramic core slurry, and obtaining a ceramic core biscuit by utilizing the ceramic core slurry through a hot-pressing injection molding method; and the ceramic core biscuit is subjected to powder burying sintering to obtain the ceramic core. Through the synergistic effect of the nanometer aluminum oxide powder, the fused corundum powder and the silicon oxide powder, a core-shell structure with aluminum oxide as a core and mullite fibers as a shell is generated in situ in the sintering process, the bonding strength of the fibers and raw material particles is enhanced, the effective retarding effect on cracks when the ceramic mold core is stressed is achieved, and the ceramic mold core has the good anti-cracking effect. The performance of the ceramic core is further enhanced.

The present invention relates to the technical field of cutting fluids. The present invention discloses a device for preparing aluminum alloy cutting fluids and cutting fluids prepared by the device. The preparation device comprises a preparation tank, a multi-stage stirring component, a speed change mechanism, a linkage adjustment mechanism, and a homogenization channel. The multi-stage stirring component comprises a power source, a power shaft, a bottom stirring paddle, a middle stirring paddle, and an upper stirring paddle; and the homogenization channel is distributed inside the bottom stirring paddle. The cutting fluid comprises at least the following components in parts by weight: 19-26wt% of vegetable oil, 3-6wt% of lubricant, 2-5wt% of rust inhibitor, 1-2wt% of coupling agent, 7-11wt% of emulsifier, 11-15wt% of PH buffer, 0.5-1wt% of defoamer, 1-1.5wt% of corrosion inhibitor, 1-2wt% of antibacterial agent, and the balance is deionized water. The present application solves the problem of uneven mixing and dispersion in the existing aluminum alloy cutting fluid preparation process, and solves the problem of insufficient stability of the emulsifier in the aluminum alloy cutting fluid preparation process, easy stratification and demulsification, and affecting the cooling and lubrication effect.

The invention relates to an electronic packaging material as well as a preparation method and application thereof. The electronic packaging material is prepared from the following raw materials: at least one prepreg containing an anhydride curing agent and hydroxylated heat-conducting particles, the prepreg containing the anhydride curing agent is combined with the hydroxylated heat-conducting particles through ester groups. The problems of compatibility and dispersity of the heat-conducting particles in the prepregs are solved by utilizing transesterification between hydroxyl groups of the heat-conducting particles and ester groups in the prepregs containing the acid anhydride compounds, the prepared electronic packaging material is excellent in heat-conducting and insulating properties, the service life of a third-generation semiconductor is prolonged, and the electronic packaging material is suitable for industrial production. And the application requirements in the fields of 5G and 6G communication, big data, new energy automobiles and the like are met.

The invention discloses a multi-modal Hash retrieval method, system and equipment based on a multi-view center structure and a medium, belongs to the technical field of artificial intelligence and multi-modal Hash retrieval, and aims at achieving the technical purpose of obtaining balance between intra-class compactness and inter-class separability in the multi-modal Hash retrieval process. According to the technical scheme, the method comprises the following steps: constructing a multi-modal data set; constructing a multi-modal Hash retrieval model based on a multi-view center structure; training the model; wherein the construction of the multi-modal Hash retrieval model based on the multi-view center structure specifically comprises the following steps: modal specific prototype learning: respectively extracting refined features from corresponding modals by using an image modal depth multilayer perceptron and a text modal depth multilayer perceptron; calculating the average value of the refined features of the image modality and the text modality to obtain a modality specific prototype, and further obtaining the unique features of the image modality and the unique features of the text modality; carrying out multi-modal integrated prototype learning; and performing multi-view semantic enhanced hash learning.

The invention relates to an enterprise credit evaluation system and method, the system comprises a data acquisition module, a feature engineering module and an evaluation module which are connected in sequence, and the method comprises the steps: obtaining the local data of an enterprise and the data of a regional big data center, and converting the data of the regional big data center into the data of an enterprise big data center; carrying out entropy calculation, IV value calculation and correlation coefficient analysis on the obtained data to determine in-mold multi-dimensional information, carrying out feature screening, screening out important features from the in-mold multi-dimensional information, and constructing a feature set; training an XGBoost model by using the feature set to obtain an enterprise credit evaluation model; and inputting the in-mold multi-dimensional information and the unified social credit code information of the to-be-assessed enterprise into the enterprise credit assessment model, and outputting a credit score and a suggested credit line corresponding to the to-be-assessed enterprise. Compared with the prior art, the method has the advantages that the problems of dispersion and inconsistency of multi-channel data sources in the prior art can be solved, timely updating of the data is ensured, and the accuracy of enterprise credit assessment results is improved.

The invention relates to a ferromagnetic metal stress and fatigue measurement method and device based on a magnetic induction chain, and the device comprises an external magnetic field generation device, a magnetic induction chain detection device, and a data processing system. The magnetic induction chain detection device is used for detecting the magnetic induction intensity value and the change of the magnetic induction intensity value at a surface detection point, and the data processing system is used for receiving and processing magnetic intensity data, analyzing the stress and fatigue damage condition of the ferromagnetic metal material and monitoring the stress and fatigue state of the ferromagnetic metal material; a magnetic induction chain is excited by an external magnetic field, stress and fatigue damage conditions of a material are observed in real time by monitoring a magnetic induction intensity value and changes of the magnetic induction intensity value, and the method has the advantages of high sensitivity, high reliability, high real-time performance, capability of solving the dispersion problem existing in an existing method and the like, realizes stress and fatigue measurement of ferromagnetic metal, and is suitable for large-scale popularization and application. And an effective stress and fatigue measurement means can be provided for ferromagnetic metal in engineering application.

The invention discloses an optical film, a preparation method thereof and a display device, and relates to the technical field of optical functional films. The optical film comprises a base film layer and an antistatic coating arranged on the surface of at least one side of the base film layer. The antistatic coating comprises the following raw material components: water-dispersible polyester resin, water-soluble resin, a cross-linking agent and an antistatic agent; the antistatic agent is obtained by compounding a single-walled carbon nanotube modified with a hydrophilic group and polyaniline acid, the antistatic agent comprises an inner core and a coating layer at least partially coating the inner core, the inner core comprises the single-walled carbon nanotube modified with the hydrophilic group, and the coating layer comprises the polyaniline acid. According to the optical film, the single-walled carbon nanotubes and the polyaniline acid form a composite conductive structure, and then the composite conductive structure is crosslinked with the water-soluble resin and the crosslinking agent to form a three-dimensional conductive network structure, so that the optical film obtains lasting and efficient antistatic performance with extremely low environmental humidity dependence on the premise of keeping high light transmittance, low haze and good coating adhesiveness.

The application discloses an ultrahigh-molecular-weight polyethylene silicon nano wear-resistant composite pipe and a preparation method thereof, and relates to the technical field of ultrahigh-molecular-weight polyethylene composite pipes. The ultrahigh-molecular-weight polyethylene silicon nano wear-resistant composite pipe is prepared from the following raw materials in parts by mass: 70-85 parts of ultrahigh-molecular-weight polyethylene, 5-15 parts of silicon nano particles, 3-6 parts of maleic anhydride grafted polyethylene, 0.1-1.2 parts of a silane coupling agent, 1-3 parts of a wear-resistant reinforcing agent, 0.3-1.5 parts of a lubricant and 0.3-1 part of an antioxidant. The surface of the silicon nano particles is modified by using a specific silane coupling agent, and the silicon nano particles are effectively combined with the ultrahigh-molecular-weight polyethylene matrix, so that the dispersibility of the nano particles in the polymer matrix is solved, and the wear resistance and the mechanical properties of the pipe are remarkably improved.

The present invention belongs to the technical field of fine chemical industry, and discloses a dispersant for dispersing heavy element single substance and compound powder and a preparation method thereof, wherein the main function is to be used as a powder dispersant, especially suitable for dispersing heavy element powder that is easy to settle; bismuth powder, lead powder, tungsten powder, lead oxide, lead tetraoxide, bismuth oxide, tungsten oxide, lead tungstate, lead borate and other functional particles with shielding ability. The anionic dispersant containing multiple hydrophilic groups such as sulfonic acid group, ester group and hydroxyl group in the structural formula is used to disperse heavy element powder, which can neutralize the excess charge on the oxide surface and wrap the powder particles, and finally form a uniform and stable high-content heavy element powder latex system, creating conditions for preparing radiation-proof latex products.

The application discloses a power transmission line crimping pipe X-ray detection device, system and method, which comprises the following steps: driving a detection module to reach a detection position through a lifting mechanism; driving the detection module to cover the crimping pipe detection range on the left and right sides in the same plane through a swing mechanism; or driving a first receiving plate and a second receiving plate to open through an opening and closing mechanism, and making the first receiving plate and the second receiving plate cover the crimping pipe detection range; and adjusting the angle of an emitter through a swing mechanism to make the emitter align with the first receiving plate or the second receiving plate. The detection position can be adaptively adjusted, the comprehensiveness and accuracy of detection are ensured, the traditional artificial tower climbing detection operation is replaced, and the intelligent detection operation level of the power transmission line crimping pipe is improved.

The present invention provides a method for preparing highly dispersed metal powder and a device for preparing highly dispersed metal powder. The method comprises the steps of (1) adding a base liquid into a synthesis reactor, and performing internal and external circulation of the synthesis reactor through an external circulation dispersion device connected to the synthesis reactor to achieve a stable circulation; (2) after the stable circulation meets a predetermined requirement, continuously adding an oxidizing liquid and a reducing liquid into the synthesis reactor to mix with the base liquid to form a reaction liquid, and continuously passing the reaction liquid through the external circulation dispersion device for forced dispersion, and then feeding it into the synthesis reactor; (3) performing sampling analysis and testing during the synthesis reaction, and when the particle size of the metal powder generated by the synthesis reaction meets the requirement, stopping the addition of the oxidizing liquid and the reducing liquid to stop the synthesis reaction; and (4) discharging the reaction liquid from the synthesis reactor, performing solid-liquid separation, cleaning, post-treatment, and drying to obtain highly dispersed metal powder.

This invention relates to the fields of computer data processing and database technology, specifically to an intelligent search system for business objects based on metadata. The system includes: a context request parsing module: receiving abstract search requests and extracting environment parameters and permission features to generate a dynamic context snapshot; a logical structure construction module: combining snapshot execution rule injection operations to generate a logical abstract syntax tree containing implicit filtering conditions; a multi-dialect compilation and execution module: translating the syntax tree into physical execution statements matching the target storage engine dialect according to physical mapping rules; and an adaptive optimization feedback module: monitoring execution latency data and dynamically correcting the index strategy definition. This invention solves the maintenance bottleneck caused by the tight coupling between business logic and physical storage in heterogeneous data source environments, achieving zero-code modification and hot deployment of business logic.

The invention relates to the field of epoxy molding compounds, and discloses a preparation method and application of a modified carbon nanotube and a preparation method and application of an epoxy molding compound. The preparation method comprises the following steps: (1) mixing a mixed acid solution with a carbon nanotube for reaction to obtain an acidified carbon nanotube; (2) mixing a mixed solution of thionyl chloride and N, N-dimethylformamide with the acidified carbon nano tube for reaction to obtain an acylating chlorination carbon nano tube; (3) under the protection of an inert gas, mixing the acylating chlorination carbon nano tube with ethanediamine for reaction to obtain an amino modified carbon nano tube; and (4) carrying out ultrasonic treatment on the amino modified carbon nanotube and a modifier containing an epoxy group. The epoxy molding compound prepared from the modified carbon nanotube has excellent strength and toughness, can effectively solve the problems of insufficient strength and toughness and the like of the existing epoxy molding compound, and can be well used in the field of electronic packaging.

The invention discloses a high-transparency TPU (thermoplastic polyurethane) hot melt adhesive film composition and a production process thereof, and belongs to the technical field of high polymer materials. The composition comprises a TPU matrix, a polymer modifier and the like. The production process comprises the following steps: synthesis of a four-arm star-shaped polymer modifier, vacuum dehydration of raw materials, high-speed mixing, gradient temperature control extrusion granulation, and gradient melting-rapid cooling curtain coating film formation under nitrogen protection. In order to overcome the defects that an existing TPU hot melt adhesive film is insufficient in transparency, poor in bonding durability and prone to migration of a modifier, star topology modifier design and a dual covalent cross-linking synergistic scheme are provided, molecular-level compatibility of the modifier and TPU is achieved, and finally the hot melt adhesive film high in transparency, high in bonding stability and excellent in processing performance is obtained. The method is suitable for high-end scenes such as optical device fitting.

The invention discloses an IFC-based bridge risk assessment method, which relates to the technical field of bridge engineering, and comprises the following steps: obtaining risk index data of different bridge structures; obtaining an original IFC dictionary file, and performing entity expansion on bridge structure components to form a bridge structure IFC file; performing attribute set expansion on the bridge structure to obtain a basic bridge risk IFC file; inputting risk index data into the basic bridge risk IFC file to obtain a bridge risk IFC file; constructing an assessment model, stipulating risk assessment levels and corresponding risk level index values, calculating risk index data to determine risk level index values ​​of different structures, associating them with corresponding structures, obtaining an updated bridge risk IFC file, and visually displaying the risk assessment levels of bridge structures to obtain bridge risk assessment results; the invention realizes standardized storage of information, visually displays bridge risks, enhances the intuitiveness of risk identification, and improves the efficiency and accuracy of risk assessment.

A visualization presentation method and device based on dynamic expansion of power grid vector slice data include: querying slice extension attribute configuration; querying and matching to obtain power grid vector slice extension attribute data; merging basic power grid vector slice data and power grid vector slice extension attribute data to generate dynamically expanded power grid vector slice data; sending the dynamically expanded power grid vector slice data to a terminal device so that the terminal device calculates a rendering layer and displays it visually in a power grid map. Since the present invention dynamically injects associated customized attribute data into basic power grid vector slice data at runtime according to the business type, it can integrate and adapt to the rendering and coloring requirements of different business maps, maintain the neatness of basic power grid vector slice data, and enrich the rendering and coloring capabilities and extended functions of power grid maps while reducing the amount of server calculations, solve the problem of bloated or scattered slice data, simplify the service architecture, and make it easy to maintain.

The invention discloses root puncture resistant radix asparagi polyurea coating resin, a preparation method thereof and a prepared coating, and relates to the field of coatings. The root-puncture-resistant radix asparagi polyurea coating resin is obtained by performing esterification reaction on (R)-2-(4-chloro-2-methyl phenoxy) propionic acid and an acrylate monomer containing hydroxyl to obtain an intermediate and then performing Michael reaction on the intermediate and fatty amine, and the molecular structure of the root-puncture-resistant radix asparagi polyurea coating resin contains (R)-2-(4-chloro-2-methyl phenoxy) propionic acid group and at least one imino group. According to the invention, the active group (R)-2-(4-chloro-2-methyl phenoxy) propionic acid in the root inhibitor is grafted to the asparagine polyurea coating resin through a chemical reaction mode, so that the problems of compatibility and dispersity of the root inhibitor (R)-2-(4-chloro-2-methyl phenoxy) propionic acid and the asparagine polyurea coating resin are solved; the root puncture resistant radix asparagi polyurea coating resin has stable root puncture resistance.

This case involves a low-roughness PET film and its preparation process. The PET film is co-extruded with an ABA three-layer structure and biaxially stretched. The A-layer raw material includes 70 to 90 parts of PET chips and 10 to 30 parts of special masterbatches; the B-layer raw material is PET chips; wherein the special masterbatch is made of KH550 modified inorganic filler and functional polymer. The beneficial effects of this application are: this application prepares a semi-aromatic polyamide as a functional polymer and an inorganic filler to form a special masterbatch, which has good compatibility when mixed with PET, avoiding the agglomeration of nanomaterials in polyester materials and making them difficult to disperse; at the same time, the inorganic particles after the composite are also difficult to precipitate from the surface of the film, which improves the stability of the surface energy of the film surface during processing and use; the ABA three-layer composite structure improves the toughness of the film; the film surface is smooth and has low roughness, which is very suitable for use as a release film such as the MLCC release film base film.

The invention discloses an autism database sharing platform based on an ETL process, and belongs to the technical field of information technologies. The sharing platform comprises a data extraction module, a data conversion module, a data loading module, a metadata management module and an access control module. According to the method, efficient integration of multi-source data is achieved through the ETL process, the problems of data dispersion and format inconsistency are solved, metadata management and data standardization technologies are adopted, the understandability and utilization efficiency of the data are improved, the data security and privacy protection module is adopted to perform privacy protection on the data, and the data security and privacy protection efficiency is improved. A safe and reliable data sharing environment is established; the system can support and promote data communication and cooperation between researchers and professionals.

The application discloses a kind of low thermal conductivity high compression phase change microcapsule foam concrete and its composite dispersion-interface anchoring preparation method.The method prepares composite dispersion solution with non-ionic surfactant and silane coupling agent, carries out pre-adsorption coating treatment to phase change microcapsule, so that wet dispersion layer and interface anchoring layer are formed on its surface;Then, the treated phase change microcapsule is mixed with cement and prefabricated foam, and foam concrete is prepared by pouring, hardening and curing.The application can improve the dispersion stability of phase change microcapsule in cement paste, enhance the interface combination of phase change microcapsule and cement hydration product, reduce the thermal conductivity of the material and increase the compressive strength, and is suitable for building energy saving and temperature regulation type cement-based material.

The present application provides a sunlight-resistant colored electrochemical energy storage fabric based on recycled cotton powder and a preparation method thereof, belonging to the technical fields of flexible electronic textiles and electrochemical energy storage. The preparation method first deposits a TiO2 film on the recycled cotton powder by ALD technology, and then performs mild hydrothermal synthesis to obtain a TMOs@TiO2@CP composite powder with a three-layer nested structure. Among them, the TiO2 film protects the internal recycled cotton powder from erosion during the hydrothermal reaction and is tightly combined with the TMOs functional layer through Ti-O-TM covalent bonds, improving the structural stability and interfacial bonding force of the composite powder. The present application uses the inherent color characteristics of different transition metal oxides to replace traditional black carbon-based materials, endowing the energy storage fabric with rich color choices and meeting the aesthetic and design requirements of high-end textiles. The process route of the present application avoids the damage to the inherent flexibility and structure of cotton fabrics by drastic means such as high-temperature carbonization.

The vehicle test operation management system comprises a vehicle information module, an operation priority management module, an automatic scheduling management module, an operation state adjustment management module, a workshop task management module, a test vehicle operation state overview module and a test problem management module. By formulating various data types, structured data templates, data storage positions, management interfaces of all modules, data reference streams and the like, the problems of complicated affairs, data dispersion and the like in the operation of the automobile development test, especially the long-period whole automobile endurance test, are solved, and the efficiency of managing the related work of the whole automobile development test operation is improved. Operation events in the whole period of the test can be recorded in detail, and a standardized test report is provided, so that the test operation efficiency and the comprehensiveness and accuracy of test data are effectively improved.

The present invention belongs to the technical field of fuel cell gas diffusion layer. The present invention provides a carbon fiber paper and a preparation method thereof. Acrylonitrile-N-4-pyridyl-2-acrylamide copolymer and N,N-dimethylformamide are mixed to obtain an electrostatic spinning solution; the electrostatic spinning solution is electrostatically spun to obtain a polyacrylonitrile-based non-woven felt; the polyacrylonitrile-based non-woven felt is pre-oxidized to obtain a polyacrylonitrile-based pre-oxidized felt; the polyacrylonitrile-based pre-oxidized felt is impregnated in a resin solution and then dried, hot-pressed, carbonized, and graphitized to obtain carbon fiber paper. The present invention also provides the application of carbon fiber paper in the gas diffusion layer of a proton exchange membrane fuel cell. The present invention adopts electrostatic spinning technology to prepare polyacrylonitrile-based non-woven felts of different thicknesses, realizes ultra-thin and controllable preparation of the thickness of carbon fiber paper, and the carbon fiber paper of the present invention has excellent conductivity, so that it has a good effect in a proton exchange membrane fuel cell.

This invention discloses a release film for multilayer ceramic capacitors and its preparation method in the field of polymer composite materials. The release film uses polyethylene terephthalate as the matrix, combined with a bimodal nanoparticle system composed of specific spherical silica and alumina. It innovatively introduces a bifunctional modifier containing perfluoroalkyl and siloxane groups, as well as a hyperbranched multi-arm block polyester siloxane synergistic interface modifier. The preparation process includes key steps such as nanoparticle surface modification, functional masterbatch melt blending and extrusion, and biaxial stretching molding. Through the synergistic effect of the two special modifiers, the dispersibility of nanoparticles in the matrix is ​​significantly improved, and the interfacial bonding strength is enhanced. This results in a release film with extremely low surface roughness and excellent anti-adhesion properties, while also exhibiting good heat resistance and dimensional stability, fully meeting the requirements of high-end multilayer ceramic capacitor manufacturing processes.

The utility model relates to a bed net, mattress and bed that fit the human body, including sleeping unit, sleeping unit includes pressure relief module, and first spring module and second spring module that are arranged at interval, the second spring module is arranged right facing the shoulder position and hip position of human body; the pressure relief module is stacked right above the second spring module, the total height of the pressure relief module and the second spring module is equal to the height of the first spring module, and the elastic force of the pressure relief module is far smaller than the elastic force of the first spring module and the elastic force of the second spring module. By means of the arrangement, the defects of pressure dispersion and supporting force of a traditional mattress are effectively overcome.