33results about How to "Physical properties unchanged" patented technology

The invention provides a multichannel system sound field reconstruction method and apparatus. The method comprises steps of acquiring loudspeaker set position information in a primary multichannel system and signal information, reconstructing loudspeaker position information in the multichannel system, and listening area sampling point position information, building a central listening area and a non-central listening area, selecting sampling points in these areas, calculating distribution coefficient matrix distributed to all loudspeakers of the reconstructed multichannel system by each loudspeaker in the primary multichannel system, and calculating final distribution signals of all loudspeakers in the reconstructed multichannel system. High-quality 3D sound field can be only displayed in a central listening point or a central listening area by a traditional method, so practical demands of listening in a non-central point cannot be met for people; based on physical features of the sound field, the provided technical scheme enables a listener to acquire optimal listening feeling in any positions in reconstructed sound fields such as the central listening area or the non-central listening area.

The invention provides a method for preparing a lithium ion battery anode material with a core-shell structure. The method comprises the following steps: dispersing a core shell, namely an anode material, in an aqueous solution of a shell material precursor, adding an organic solvent into the solution, crystallizing and separating the shell material precursor on the surface of the core material, filtering, performing heat treatment, and thus obtaining the lithium ion battery anode material with the core-shell structure. The dissolubility difference of the shell material precursor in an aqueous phase and an organic phase serves as driving force, and the impurity core shell serves as a seed crystal, so that the shell material is uniformly deposited on the surface of the core material, and the lithium ion battery anode material with the core-shell structure is formed. The method has the advantages of uniform coating, simple process, short period, low cost and the like and is suitable for industrial production.

The invention discloses a brazing method for porous ceramic and metal. Compacting paint which comprises but not limited to yttrium oxide powder, silicon oxide powder, aluminum oxide powder and nano alpha-Si3N4 particles is uniformly sprayed to a to-be-welded surface of the porous ceramic and is heated to 1400 DEG C-1600 DEG C under the protective atmosphere, and heat preservation is conducted for 30 min-90 min, so that a compacting coating is formed on the sprayed surface; and then vacuum brazing is conducted with corresponding brazing filler metal, and thus better connection between the metal and the porous ceramic can be achieved. The invention aims at providing the vacuum brazing method which can achieve more effective high-strength connection between the porous ceramic and the metal, an obtained brazed joint of the porous ceramic and the metal is good in mechanical property, and the practical application requirement can be met.

The invention relates to a surface cross-linking treatment method for thermoplastic starch products and belongs to the technical field of a solid material surface modifying method. The method comprises the steps of: leading the cross-linking agent into the surface layer of the thermoplastic starch products, performing the cross-linking reaction between the cross-linking agent with the hydroxyl on starch molecule under a condition of heating and forming a cross-linking network between the starch molecule chains on the surface layer of the products. According to the method, the solid cross-linking reaction is utilized to only perform proper cross-linking treatment on hydrophilic hydroxyl on the surface layer of the thermoplastic starch products. Without changing the condition of the main component of the thermoplastic starch products and the treatment property, the sensibility of the products to the environmental humidity is decreased and the water-tolerant property is promoted. After the surface is cross-linked, the sensibility of the products to the environmental humidity is obviously decreased. Under an environment with humidity of 95%, the balanced water content is at least 64.2% of the water content before being modified, namely decreased by 35.8% at most. The anti-solvent dissolubility is also obviously promoted. The solvent which is soluble in dimethyl sulfoxide becomes insoluble.

A process for producing a functional membrane comprising an ion irradiation step in which a polymeric film base is irradiated with high-energy heavy ions at a density of 10⁴ to 10¹⁴ particles/cm² to generate active species in the film base; and, subsequent to the ion irradiation step, a graft polymerization step in which at least one monomer selected from the members of group A which are monomers each having a functional group and 1 to 80 mol% (based on the total amount of the monomer(s) of group A) of a monomer selected from the members of group B which are crosslinking agents for the monomers of group A are added to the film base and graft polymerization of the film base and the monomers are then performed; and a functional membrane produced by the process.By employing this process, it becomes possible to produce a functional membrane which combines high functionality with gas-barrier property inherent in a polymeric film base. In particular, a polymeric electrolyte membrane having high proton conductivity and good gas barrier property can be produced, which is highly suitable as a polymeric electrolyte membrane for a fuel cell.

The invention relates to a pipeline and a manufacturing technology thereof, in particular to a multifunctional composite pipe capable of delivering different media simultaneously and a manufacturing process used for manufacturing the composite pipe. The composite pipe comprises wires, a pipe body and a wrapping layer. The wires are parallel to the pipe body. The outer portions of the wires and the outer portion of the pipe body are provided with the wrapping layer in a seamless mode. The wrapping layer is made of high-polymer materials. The core of the composite pipe and the forming process of the composite pipe is that the outer portions of the wires and the outer portion of the pipe body are covered with the high-polymer materials in a molten state, and the physical properties of the wires and the pipe body keep unchanged in the manufacturing process; the relative positions of the wires and the pipe body are maintained through the high-polymer materials, so the composite pipe has good strength and stability.

The invention relates to the technical field of oil production engineering for oil fields, provides a high-temperature solid foam draining agent for drainage gas recovery for gas wells and a preparation method of the foam draining agent and is researched to solve the problems that high-temperature deep gas well foam draining agents have reduced performance, are poor in draining effect and inconvenient to store and fill in winter and the like. The high-temperature solid foam draining agent is prepared from, in percentage by weight, 20%-30% of alkyl sulfate, 10%-15% of ammonium lauryl sulfate C12H25SO4NH4, 25%-35% of stearic acid C18H36O2, 8%-12% of sodium carbonate Na2CO3 and the balance of water. The invention further provides the preparation method of the foam draining agent. The foam draining agent is suitable for deep gas wells with the well temperatures larger than or equal to 120 DEG C or the well depths larger than or equal to 3,500 m, is particularly applied to continuous production and intermittent draining gas wells and has the advantages of being good in foaming performance and high in foam stability at the high temperature, convenient to store and transport, small in pollution and the like.

The invention discloses a packaging film for a multilayer co-extruding urine bag. The packaging film comprises a heat sealing layer, a core layer and a weather-resisting layer, which are arranged in turn, wherein the heat sealing layer, the core layer and the weather-resisting layer are modified ethylene-vinyl acetate copolymer layers. The invention also discloses a method for producing the packaging film for the multilayer co-extruding urine bag. The method comprises the following steps: preparing materials, extruding a multilayer co-extruding film head, blowing up, cooling and shaping, rotating and dragging, measuring thickness on line, coiling and cutting. The packaging film for the multilayer co-extruding urine bag provided by the invention is the packaging film which is excellent in comprehensive property, especially separating property, is suitable for various devices and interfaces, is excellent in properties for sealing and protecting urine, and is used as a urine packaging material applied to the medical field.

The present invention relates to a hanging drop protection cover automatic separation device. The device comprises a clamping body, a hanging device, a protective cover connection rod and the like. The left and right sides of the clamping body are provided with support lugs, and the upper and lower surfaces of the clamping body are provided with a middle through hole and a side through hole; the front side of the clamping body is provided with a fastening hole and a regulation hole; the hanging device comprises a metal rod and a quartz frame; the tail end of the metal rod is fixedly connectedwith the top plate of the quartz frame; the metal rod penetrates the middle through hole, and is fixed through a fastening screw in the fastening hole; the protective cover connection rod penetrates the side through hole and is regulated through a regulation screw in the regulation hole; the middle section of the protective cover connection rod is provided with a supporting rod being perpendicularto the protective cover connection rod, and a positioning screw is fixed on the supporting rod; an inlet panel is fixed at the upper portion of a high-temperature cavity and is located below the positioning screw; the bottom end of the protective cover connection rod is fixedly connected with the top end of a quartz glass cover; and a through hole configured to put a thermocouple is formed at themetal rod, the middle portions of the quartz frame and the quartz glass cover. The hanging drop protection cover automatic separation device allow the drop to be closer to the state of an initial position at a target position when evaporation starts.

The invention belongs to the technical field of rubber materials and relates to high temperature resistant chloroprene rubber and a preparation method thereof. The high temperature resistant chloroprene rubber is prepared from the following raw materials in parts by weight: 80 to 120 parts of chloroprene rubber, 4-6 parts of magnesium oxide, 0.3-0.7 part of stearic acid, 3-6 parts of a vulcanizingagent, 1-3 parts of a vulcanization retarder, 0.3-0.4 part of an accelerant, 1-3 parts of an antioxidant and 1-3 parts of a plasticizer. The high temperature resistant chloroprene rubber is physically stable, can maintain the physical properties unchanged in harsh environment, is especially good in high temperature resistance, and is suitable for use in high temperature environment.

The invention relates to the field of particle simulation numerical simulation and particularly relates to a Voronoi diagram particle combination algorithm based on particle simulation. According to the method, a particle list is preprocessed before combination, particles with large weights are screened out, large numerical noise caused by the fact that the weights of the combined particles are too large is avoided, and meanwhile the speed of the whole calculation process is increased; selection of the expected weight is more reasonable through the selection of the preprocessing rule, so a purpose of quickly finding out similar particle groups is achieved, and calculation efficiency of the Voronoi graph particle merging algorithm is improved. According to the method, the limitation that the number of particles is too large in the simulation process of the PIC method is overcome, the algorithm ensures that the physical characteristics before and after merging are unchanged while the scale of the simulated particles is reduced, calculation efficiency is greatly improved, and user input parameters can be conveniently adjusted to control the final merging error and the number of remaining particles expected by a user.