1985results about How to "Reduce voids" patented technology

A process and associated apparatus used to prepare a thermoplastic composite from a plurality of plies of thermoplastic resin prepregs. The prepregs are formed into a composite structure under two chambers; a rigid outer chamber (of any convenient size or shape) and a second flexible inner chamber containing a prepreg lay-up. The absolute pressures are reduced concurrently in a stepwise method in both chambers. This concurrent, stepped pressure reduction is accomplished at a rate which prevents the vacuum bag from moving far from the prepregs, and prevents wrinkles from forming in the prepregs. Pinching off the diffusion paths required for the removal of unwanted gases is eliminated. The lay-up is then heated and the absolute pressure in the outer rigid chamber is increased. This pressure constrains the flexible inner chamber during out-gassing of the thermoplastic resin, preventing wrinkles from forming in the prepregs. The absolute pressure in the outer rigid chamber is increased to atmospheric pressure or greater causing the prepregs to consolidate. A low absolute pressure is maintained in the flexible inner chamber. The temperature is then increased to the cure temperature of the resin and held for a time sufficient for the resin to cure. The resulting consolidated thermoplastic resin is substantially void free and detectable wrinkles are absent.

A small and highly reliable acoustic wave device and a method for production of the same will be provided. The acoustic wave device has a piezoelectric substrate 1; a SAW element 2 on one main surface of the piezoelectric substrate 1; an outside connection-use conductor 3 formed on the one main surface of the piezoelectric substrate 1 and electrically connected to the SAW element 2; a columnar electrode 10 on the outside connection-use conductor 3; and a protective cover 6 defining inner walls of a vibration space 7 for vibration of the SAW element 2 and planarly surrounding a side surface of the columnar electrode 10.

The invention relates to a process for bonding by molecular adhesion of two substrates to one another during which the surfaces of the substrates are placed in close contact and bonding occurs by propagation of a bonding front between the substrates. The invention includes, prior to bonding, a step of modifying the surface state of one or both of the surfaces of the substrates so as to regulate the propagation speed of the bonding front. The surface can be modified by locally or uniformly heating or roughening the surface(s) of the substrate(s).

An electrostatic lens comprising a first conductive plate with a first aperture, a second conductive plate with a second aperture, the second aperture being substantially aligned with the first aperture, a voltage supply for supplying a first voltage to the first conductive plate and a second voltage to the second conductive plate, the first voltage being lower than the second voltage, and an insulating structure for separating the first conductive plate from the second conductive plate. The insulating structure comprises a first portion in contact with the first conductive plate and a second portion in contact with the second conductive plate, the first portion having an overhanging portion and the second portion having an indented portion at an edge of the insulating structure, so that a gap is formed between the overhanging portion and the second conductive plate.

The invention discloses a transmission method and a device for transmitting the uplink control information. The method comprises the steps of according to a PUCCH structure, numbering the PUCCH resource loaded on an available resource block (RB) in a PUCCH narrow band; and transmitting the UCI according to the numbered PUCCH resource. The PUCCH structure includes but not limited to a 1x structure and a 2x structure, wherein the 1x structure and the 2x structure are in PUCCH format. According to the technical scheme of the invention, all 1x structures and all 2x structures, designed in PUCCH format and loaded on all available resource blocks in the PUCCH narrow band, are numbered respectively according to the above 1x structure and the above 2x structure. Meanwhile, according to the uniformly numbered 1x and 2x structures in the PUCCH format, the UCI is transmitted, so that the same resource region in the PUCCH narrow band can be shared by the 1x and 2x resources in the PUCCH format. Therefore, unnecessary PUCCH resource cavities are reduced to a certain extent. Moreover, the UCI transmission efficiency within the range of the PUCCH narrow band is improved. As a result, the efficient transmission of the UCI in the newly introduced PUCCH narrow band in the uplink transmission can be realized.

The invention provides a preparation method of a high-heat-conduction flexible graphene film. Oxidized graphene powder is frozen, dried and dispersed in a solvent, and an oxidized graphene dispersion liquid with the concentration being 0.1-10 mg/ml is obtained; the oxidized graphene dispersion liquid is added to a spraying device and sprayed on a substrate, the substrate is heated at the temperature of 50-150 DEG C for 0.5-5 h, and the oxidized graphene film is formed on the substrate after the dispersion liquid is evaporated; the oxidized graphene film is peeled off and rolled; hot-pressing carbonization and high-temperature graphitization are performed under the protection of a protective atmosphere, and the heat-conduction graphene film is obtained. With the adoption of the method, the high-heat-conduction flexible graphene film with the size and the thickness being controllable can be effectively prepared to meet requirements of different heat dissipation devices and can be applied to various wearable equipment, smart phones, smart televisions and LEDs on a large scale to improve the heat dissipation effect.

The invention discloses straw fiber reinforced foam concrete and a preparation method thereof, and belongs to the technical field of building materials. The straw fiber reinforced foam concrete comprises the following components by mass: 40-80 parts of a cementitious material; 1-20 parts of a fine lightweight aggregate; 0.05-0.6 part of straw fiber; 2-8 parts of a chemical foaming agent; 0.5-4 parts of a physical foaming agent; 0.02-0.14 part of a foam stabilizing agent; 0.1-0.8 part of a catalyst; 0.05-0.6 part of a thickening agent and 15-30 parts of water. The preparation method is as follows: mixing and stirring the cementitious material, the straw fiber and the thickening agent, then adding the water, the chemical foaming agent, the foam stabilizing agent and the catalyst, stirring to obtain a slurry mixture, then adding expanded vermiculite, stirring to obtain chemically foamed foam concrete; adding the physical foaming agent into the chemically foamed foam concrete, stirring, pouring into a mould, and demoulding after concrete is solidified and hardened to prepare the straw fiber reinforced foam concrete. The straw fiber reinforced foam concrete has a more uniform multihole structure, and the water proof, sound insulation and heat insulation effects are better than that of foam concrete in the prior art.

The invention discloses a PPTA paper using aramid nanofiber for self-reinforcement and a preparation method thereof. The preparation method includes: utilizing para-aramid paper nanofiber with the advantages of special nano-structure, small fiber diameter, large length-diameter ratio, high surface activity, excellent heat resistance and the like as the self-reinforcement material of para-aramid paper, conducting mixing, defibering and dispersion on aramid chopped fiber, pulp or fibrid and aramid nanofiber to make a uniform suspension, carrying out papermaking shaping, squeezing and drying, andfurther performing hot-pressing on a hot press to obtain aramid paper. The introduced aramid nanofiber enables nanoscale aramid fiber and an aramid nanofilm formed thereby to reach the good interfacefilling, coating and enhancement effects, provides more binding sites for the combination of components, at the same time reduces the pores and holes between components, significantly improves the bonding strength between the aramid paper components, and greatly enhances the mechanical and insulation properties.

The invention discloses a treatment method for improving the performance of a 3D printing metal workpiece. The treatment method comprises the following steps of sequentially carrying out primary cryogenic treatment and primary tempering treatment; carrying out secondary cryogenic treatment and secondary tempering treatment on a metal for 3D printing. The 3D printing metal workpiece treated by the treatment method disclosed by the invention has the micro-structural characteristic that when the 3D printing metal workpiece is subjected to cryogenic treatment, due to ultra-low temperature effect, the internal microstructure of the metal workpiece is shrunk, the gap is reduced, and thus the density of the product is increased; meanwhile, under cryogenic treatment conditions, ultrafine carbides are precipitated, the fine dispersed carbides can hinder the movement of dislocation in the plastic deformation of the material, and thus the wear resistance of the metal workpiece is enhanced; the lattice of martensite is promoted to be changed at an ultra-low temperature environment, the internal microstress of the metal workpiece is reduced, and the microstructure is strengthened, so that the hardness, impact toughness and wear resistance of the metal workpiece are significantly increased, and the microstructure and overall performances of the metal workpiece are finally improved, thereby enhancing the mechanical properties of the 3D printing metal workpiece.

The invention discloses a slurry-homogenizing process for positive electrode slurry of a lithium ion battery, a positive electrode plate and the lithium ion battery, and belongs to the technical field of manufacturing of the lithium ion battery. The slurry-homogenizing process for the positive electrode slurry of the lithium ion battery comprises the steps of preparing an adhesive solution, stirring by a V-shaped stirrer, performing pre-mixing and stirring, performing high-speed stirring, performing viscosity adjustment, performing vacuum defoaming and the like; the positive electrode plate of the lithium ion battery comprises a positive electrode current collector and the positive electrode slurry for coating the positive electrode current collector; the positive electrode current collector adopts an aluminum foil; the positive electrode slurry is prepared by the slurry-homogenizing process for the positive electrode slurry of the lithium ion battery; and the lithium ion battery adopts the positive electrode plate of the lithium ion battery prepared by the method. By adoption of the slurry-homogenizing process, the solid content of the slurry is increased, so that solid granule friction in stirring can be improved, and the uniformity and the stability of the slurry can be improved; and by lowering a baking temperature in a drying oven in coating and drying, gaps formed between active material granules, conducive carbon granules and a binder can be reduced, thereby enhancing an adhesive effect and improving the performance of the lithium ion battery.

The invention relates to a foldable house and an assembling and disassembling method thereof, and belongs to the technical field of moveable house structures. The foldable house comprises a first unit and a second unit, wherein the first unit and the second unit are structurally symmetric and can be integrally assembled with each other to form the foldable house; the first unit and the second unit both comprise bottom plates and mountain wall plates which are hinged to two opposite sides of the bottom plates; side wall plates are arranged between the two mountain wall plates; the bottoms of the side wall plates are hinged to the bottom plates; a top plate is hinged to the tops of the side wall plates; side surface connecting parts and top connecting parts of both the first unit and the second unit are respectively assembled integrally through detachable side connecting members and top connecting members. The foldable house is smart in structural design, small in space, light in weight, rapid in assembly and disassembly, and convenient and rapid in transport, and can be repeatedly assembled and disassembled for use.

To provide a production method of a polycrystalline ceramic body with excellent density, a preparation step, a mixing step, a forming step and a heat-treating step are performed. In the preparation step, a coarse particle ceramic powder, and a fine particle powder having an average particle diameter of ⅓ or less of the average particle diameter of the coarse particle ceramic powder are prepared. In the mixing step, the coarse particle ceramic powder and the fine particle powder are mixed to produce a raw material mixture. In the forming step, the raw material mixture is formed to a shaped body. In the heat-treating step, the shaped body is heated and thereby sintered to produce a polycrystalline ceramic body. In the heat-treating step, a temperature elevating process and a first holding process are performed and at the same time, a second holding process and/or a cooling process are performed. In the temperature elevating process, heating is started to elevate the temperature and in the first holding process, the shaped body is held at a temperature T1° C. In the second holding process, the shaped body is held at a temperature T2° C. lower than the temperature T1° C. In the cooling process, the shaped body is cooled at a temperature dropping rate of 60° C./h or less from the temperature T1° C.

The invention discloses an image depth estimation method and system. The method is implemented by comprising the steps of establishing a depth estimation network, wherein the depth estimation network comprises a coding part, a convolutional connection part and a decoding part, and a deconvolutional layer of the decoding part is connected with a last convolutional layer in a convolutional block with the same scale as the coding part to form a final deconvolutional layer; selecting two continuous images in sample images and a depth image of one image as training samples, and training the depth estimation network by utilizing the training samples to obtain a trained depth estimation network; collecting a test image, and extracting a current frame image of the test image and a previous frame image of the current frame image; and inputting color channels of the current frame image and the previous frame image to the trained depth estimation network to obtain a depth image of the current frame image. The method is high in efficiency; and the obtained depth image is high in accuracy and high in compactness.

A high water resistance emulsion polyacrylate pressure sensitive adhesive and a preparation method and application thereof relate to the field of acrylate pressure sensitive adhesive tapes. The emulsion polyacrylate pressure sensitive adhesive is characterized in that by weight, the pressure sensitive adhesive is formed by mixing a component (A) and a component (B). The component (A) is 92% to 97% of polyacrylate emulsion, and the component (B) is 3% to 8% of water-soluble monomer and free radical initiating agent. The prepared emulsion polyacrylate pressure sensitive adhesive is coated on the surface of a carrier to form an adhesive coating, the thickness of the adhesive coating ranges from 25mum to 50 mum, and the adhesive coating is in thermal polymerization for 30 minutes to 40 minutes at the reaction temperature of 30 DEG C to 50 DEG C, and is dried to obtain a pressure sensitive adhesive tape with the adhesive thickness ranging from 25mum to 35mum. The pressure sensitive adhesive tape prepared by the emulsion adhesive is good in each performance, simple in preparing process, free of pollution, low in cost and suitable for massive industrial production.

Disclosed is a flip-chip bonding method to reduce voids in underfill material. A substrate with connecting pads is provided. At least a chip with a plurality of bumps is bonded on the substrate and then an underfill material is formed between the chip and the substrate. Finally, the substrate is placed in a pressure oven in which a positive pressure greater than one atm is provided, meanwhile, the underfill material is thermally cured with exerted pressures to reduce bubbles or voids trapped inside the underfill material to avoid popcorn issues due to CTE mismatch between the chip and the substrate. In one embodiment, another underfill material is further formed between a plurality of chips and bubbles or voids trapped between the chips are also reduced by the pressurized curing.

The present invention relates to preparation process of serial lignosulfonate air entraining and water reducing admixtures for concrete. The preparation process includes the following steps: dissolving solid lignosulfonate in water of the same weight, adding catalyst and oxidant, heating after reaction, adding amine and partial aldehyde to aminate, and dropping the rest aldehyde for condensation reaction to obtain the product; adding surfactant and polymer through stirring, and cooling to obtain liquid phase lignosulfonate as air entraining and water reducing admixture. The present invention is used as the admixture for concrete, and has relatively high water reducing rate, capacity of raising the strength of concrete, and certain setting retarding effect to delay the appearance of cement setting heat peak and reduce crack caused by temperature change.

The anti electromagnetic interference material is composed of several layers: the impedance matching layer is made of absorbing type sendust powder, manganese-zinc ferrite and resin; the absorbing layer is made of absorbing type sendust powder, nickel zinc ferrite and resin; the reflecting layer is made of reflection type sendust powder, iron powder and resin.

The invention relates to a novel patching material which comprises the following components in percentage by mass: 70-75% of ash, 20-22% of polymer emulsion and 5-8% of fiber, wherein the ash comprises quick-hardening sulphoaluminate cement, a water reducing agent, an expanding agent and a setting accelerator. The patching material prepared according to the proportion can be used for quick patching of concrete bridges, dams, roads and buildings, and has the advantages of close bonding with concrete, high strength, endurable water resistance and corrosion resistance. When in use, the patching material of the invention does not need to level the construction base level or make a protective layer, thereby saving time and labor and being a nontoxic no-pollution environment-friendly patching material.

The invention pertains to the technical field of rare earth magnetically hard material, in particular to a multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and a preparation method thereof.A final magnet contains multiple differently-sized hard-magnetic main-phase particles having different anisotropic fields HA. Different main-phase particles account for different volume fractions and are differently distributed, wherein Nd denotes a red earth element having the most content based on the mass percent. According to mass percent, the chemical formula of the permanent magnet is expressed as (Dd, Re) aFe100-a-b-cBbTmc. By respective selection, different types of main-phase materials such as (Nd, Pr)-Fe-B, (PR, La, Ce)-Fe-B, (Dy, Tb, Ho, Gd, Er)-Fe-B in the ratio of 2:14:1 in order to prepare corresponding coarse magnetic powder, thin magnetic powder and magnetic nanocrystalline powder. Power is utilized for absorbing hydrogen and controlling oxygen. Liquid-phase sintering technology on the pressurized condition at low temperature is adopted for preparation. The multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and the preparation method thereof have following beneficial effects: a large piece of magnet does not easily have crack; crack resistance of the magnet is improved; high coercive force and high magnetic energy product are obtained; and the preparation technology is suitable for scale production in engineering.