31results about How to "Eliminate structural defects" patented technology

The invention discloses a preparation method for a polystyrene/polyvinylidene fluoride cation exchange membrane. According to the method, polyvinylidene fluoride is used as a matrix material for the membrane. The method comprises the following steps: dissolving polyvinylidene fluoride and then fully mixing dissolved polyvinylidene fluoride with styrene and a cross-linking agent so as to obtain a homogeneous polymer solution; carrying out heat-initiated crosslinking copolymerization so as to obtain gelatinoid with an interpenetrating network structure; subjecting the gelatinoid to polymer physical processing so as to obtain polystyrene/polyvinylidene composite powder; then preparing cation exchange powder by using a sulfonation method for a storng-acid cation exchange resin as reference; and finally preparing the cation exchange membrane by using a hot pressing molding method for a heterogeneous cation exchange membrane. The polystyrene/polyvinylidene fluoride cation exchange composite high polymer membrane prepared in the invention has the interpenetrating network structure, so the structural defect of incompatibility between cation exchange resin powder and a high polymer binder in conventional heterogeneous cation exchange membranes is eradicated, membrane resistance is substantially reduced, and comprehensive properties of the polystyrene/polyvinylidene fluoride cation exchange membrane in the invention are closer to comprehensive properties of cation exchange membranes.

PCT No. PCT/RU96/00249 Sec. 371 Date Aug. 31, 1998 Sec. 102(e) Date Aug. 31, 1998 PCT Filed Sep. 2, 1996 PCT Pub. No. WO98/09676 PCT Pub. Date Mar. 12, 1998The present invention relates to equipment for producing a hypoxia gas mixture and for use during hypoxia training at regular intervals. The present invention may be used in the field of practical medicine during a therapy involving gas mixtures with a low oxygen content. This invention essentially relates to an apparatus for producing a gas mixture for hypoxia training at regular intervals, wherein said apparatus comprises the following elements serially connected: a compressor; a gas-distribution member made of hollow polymeric fibers of poly-4-methylpentens-1; a duct with a flow-meter; a moisturising unit; a patient mask with a breathing valve; a system for automatically controlling the operation mode parameters, wherein said system comprises a patient-condition monitoring device with an oxygen indicator and a spirometer; and a drying unit mounted before the gas-distribution member. This drying unit is made in the shape of two truncated cones which are connected together at their larger bases on a single support rod, wherein said rod comprises in its central part a disc having a diameter 4 to 6 times larger than that of said rod. Hollow fibers made of mixtures of poly-4-methylpentens-1 with different melt index are wound on the last cone.

The invention relates to a ceramic abutment for a dental implant. The ceramic abutment comprises a substrate with a countersunk head through hole, wherein a central countersunk head screw of which the external threads are matched with an implant threaded hole is formed in the countersunk head through hole; a reducer connection ring is arranged at the lower end of the substrate; a bulged edge which extends outwards is arranged on the middle part of the substrate; a metal bottom layer is wrapped on an excircle of the upper part of the substrate; the bottom end of the metal bottom layer expands outwards along the upper surface of the bulged edge; a casting ceramic layer is wrapped outside the metal bottom layer; and the appearance of the casting ceramic layer is matched with that of a concave hole at the bottom of a ceramic crown. A manufacturing method comprises the following steps of: manufacturing a metal bottom layer wax mold and a sprue on the substrate, fixing the metal bottom layer wax mold and the sprue in a casting ring, and pouring embedding material mixed liquid into the casting ring for embedding; roasting an embedding body, melting the wax mold, pouring wax liquid, melting a metal alloy, pouring the molten metal alloy into an embedding body cavity from the sprue, and clearing an embedding material after casting to obtain the substrate wrapped with the metal bottom layer; manufacturing a wax mold of which the shape is matched with that of the casting ceramic layer and a sprue, fixing the wax mold and the sprue in the casting ring, and pouring the embedding material mixed liquid into the casting ring for embedding; roasting an embedding body, melting the wax mold, pouring wax liquid, melting casting ceramic, pouring the molten casting ceramic into a cavity of the roasted embedding body from the sprue, and clearing an embedding material after casting to obtain an initial finished product; and polishing the initial finished product and modifying.

The invention provides a wall-mounted air conditioner which comprises a shell, an air inlet, a first air outlet, a heat exchanger and a cross-flow fan. The air inlet is formed in the shell, the first air outlet is formed in the lower portion of the shell, the heat exchanger is arranged in the shell, and the cross-flow fan is mounted in the shell and used for enabling air flow entering from the air inlet to be discharged from the first air outlet; the wall-mounted air conditioner further comprises a second air outlet, a centrifugal fan and a driving mechanism, the second air outlet is arranged in the upper portion of the shell, the centrifugal fan is mounted in the shell and used for enabling the air flow entering from the air inlet to be discharged from the second air outlet, and the driving mechanism is used for driving the cross-flow fan and the centrifugal fan to rotate. The second air outlet is additionally arranged in the topmost of an existing wall-mounted air conditioner, so that structural defect that the air conditioner blows air obliquely and downwardly is eliminated, and cold air of the air conditioner can be completely prevented from being blown to people; in addition, good outlet airflow organizing and regulating capacities are achieved under different conditions of cooling, heating and the like, free regulation can be achieved according to preferences of users, comfortableness of indoor environment can be improved, and user's satisfaction can be improved.

The invention provides a plant point cloud blade segmentation and phenotypic characteristic measurement method, comprising the steps: firstly, performing accurate point cloud three-dimensional reconstruction on potted plants by using a multi-view stereoscopic vision algorithm; secondly, removing non-blade parts in the plant point cloud by using a region and color-based filter and a normal vector difference algorithm; and then realizing single-blade segmentation on the canopy with the blade overlapping phenomenon by means of curvature information and a multi-feature region growth algorithm. Foreach single blade, a 3D bounding box of the blade is estimated by utilizing PCA, and the blade inclination angle can be calculated as an included angle between the height direction of the bounding box and the Z axis of a crop coordinate system, and the blade length and the blade width are the length and the width of the bounding box. The plant point cloud blade segmentation and phenotypic characteristic measurement method can realize automatic blade segmentation of potted plants with overlapped and clustered blades, has high precision and real-time performance for extracting phenotypic information such as blade area, blade length, blade width, blade inclination angle and the like, and is suitable for high-throughput blade phenotypic analysis.

The invention discloses a polystyrene/polyvinylidene fluoride quaternary ammonium type anion exchange alloy film preparation method, which comprises the following steps: dissolving polyvinylidene fluoride firstly, uniformly mixing the polyvinylidene fluoride and a polymerized monomer solution containing styrene, a cross-linking agent and an initiator, and then heating for copolymerization, extruding, solidifying, granulating, drying, crushing and other steps for obtaining polystyrene/polyvinylidene fluoride alloy powder; obtaining a quaternary ammonium type anion exchange alloy powder by applying chloromethylation reaction and amination reaction to alloy powder finally using a hot pressing moulding method, adding auxiliary material, banburying, milling, pulling sheet, hot pressing, cooling and obtaining polystyrene/polyvinylidene fluoride quaternary ammonium type anion exchange alloy membrane. The quaternary ammonium type anion exchange alloy membrane prepared by the invention has the advantages of high-molecular interpenetrating network structure, which completely eliminates the structure defect that the anion exchange resin powder and the high-molecular binder in the traditional interphase anion exchange membrane are not compatible with low resistor.

The process of preparing fiber preformed rod includes deuterium-hydrogen displacement reaction on quartz rod with low hydroxyl radical content and high purity for deuterium atom to occupy the non-bridge oxygen bond in quartz glass so as to reduce the probability of hydroxyl radical to diffuse, plasma flame etching to eliminate surface adsorbed hydroxyl radical of the quartz rod completely, depositing GeO2 and SiO2 onto the surface of the quartz rod, combined loose perform rod with central quartz rod, and dewatering and sintering in a sintering furnace to obtain transparent fiber preformed rod. The present invention is suitable for large- scale production and has low production cost, and the fiber preformed rod may be drawn into mono-mode fiber with low attenuation at 1383 nm wavelength, high hydrogen ageing resistance and very low PMD.

The invention discloses a method for improving uvioresistant laser damage for fused quartz optical element, comprising: using an alkaline solution to perform ultrasound cleaning on the fused quartz element; using ultrapure water to perform ultrasound cleaning on the fused quartz element cleaned by the alkaline solution, and drying the same; performing secondary vitrification conversion temperature heating treatment on the fused quartz element cleaned by the ultrapure water; and performing dynamic acid etching and drying on the fused quartz element after the heat treatment. The invention achieves the purposes of eliminating the structural defects of the fused quartz and improving uvioresistant laser damage for fused quartz by controlling parameters such as the temperature and the time of the secondary vitrification conversion temperature heating treatment, frequency of the dynamic acid etching sound field, solution concentration, and etching time, so as to meet running requirements of solid laser device with high power.

The invention discloses a polystyrene/polystyrene anion exchange alloy film preparation method, which comprises the following steps: adding a polymerized monomer solution which is composed of 1-(chloromethyl)-4-ethenylbenzene, a cross-linking agent and an initiator into a polyvinylidene fluoride solution, and then heating for copolymerization, extruding, solidifying, granulating, drying, crushing and other steps for obtaining PCMS/polyvinylidene fluoride alloy powder; reacting the alloy powder and the amination solution, washing, transforming, drying and obtaining the anion exchange powder; finally using a hot pressing moulding method, adding auxiliary material, banburying, milling, pulling sheet, hot pressing and obtaining polyvinylidene fluoride/ polystyrene anion exchange alloy membrane. The anion exchange alloy membrane manufactured by the invention has the advantages of high-molecular interpenetrating network structure, whose membrane area resistance is greatly lower than the traditional interphase anion exchange membrane, and the comprehensive properties of the membrane approaches to the homogeneous anion exchange membrane. The invention avoids the usage of carcinogenic reagent chloromethyl ether, and is easy for realization of industrial production.

The invention relates to a preparation method of a metal-carbon composite, and belongs to the technical field of metal material preparation. Carbon particles are embedded in metal powder to conduct pre-oxidation treatment, carbon particles on the surfaces of metal particles are removed, the metal particles are reduced in a reduction atmosphere, and then the metal particles are mixed with other components to be pressed and sintered to obtain the metal-carbon composite. The preparation method successfully solves the problem that surface sintering is not compact during the sintering process of the metal powder with the carbon particles being embedded in. Under the premise that the metal powder is compact in sintering, the mechanical performance and abrasion resistance of the designed and prepared metal composite are greatly improved. The preparation technology is simple and the cost is low.

The invention discloses a chitosan bone nail material with a spiral orientation structure and a preparation method thereof. The method comprises the following steps: preparing a chitosan solution by adopting a mechanical stirring method; performing wet spinning on the chitosan solution by utilizing an injection device with a duct; performing orientation stretching and sequential spiral winding collection on primary fiber by adopting a collecting device at adjustable rotating speed, thereby acquiring a chitosan fiber bar with a compact three-dimensional piling structure; washing the bar till pH=6-8 and then placing into a SBF (Simulated Body Fluid) for mineralizing; and cleaning and drying, thereby acquiring the chitosan bone nail. A medical chitosan bone nail prepared according to the invention has a height orientation structure and a self-threading function; the step of externally threading is avoided; the structure defects and the raw material waste brought by the process of externally threading are eliminated; the bone induction regeneration capacity of the bone nail is greatly promoted in the mineralizing process; the bone nail is expected to be applied to the field of bone regeneration and repairing.

The invention discloses an FRP-SMA steel bridge deck pavement structure. The structure is composed of an FRP pavement protection layer and an SMA pavement wearing layer which are laid from bottom to top. The top face, facing the SMA pavement wearing layer, of the FRP pavement protection layer is provided with convex-edge matts-shaped shear keys; and the thickness of the SMA pavement wearing layer embedded into the matts of the FRP pavement protection layer is a thermosetting SMA thin layer, and the rest thickness is a thermoplastic SMA thin layer. According to the present invention, the convex-edge matts-shaped shear keys of the FRP pavement protection layer can restrain the SMA mixture to drive the interface bonding resin to slide during the SMA pavement wearing layer construction so as to ensure the interface connection quality, and can provide the synergistic effect with the thermosetting SMA thin layer of the SMA pavement wearing layer so as to enhance interface shear connection in the transverse bridge direction and the longitudinal bridge direction after the SMA wearing layer molding, so that the structure form is more reasonable, structural stress is safer, design and construction quality is more controllable, engineering cost is more economical, the two technical problems which are difficult to solve in the asphalt concrete steel bridge deck pavement structure can be solved, and the technical and economic levels of flexible steel bridge deck pavement are remarkably improved.

The embodiment of the invention discloses a circuit board processing method and device. The circuit board processing method comprises the steps that a first line pattern is formed on a first face of a first conductive substrate, and if the first face is a rough face of the first conductive substrate, the first line pattern is formed based on the mode that the first face is plated with a conductive material; a second line pattern is formed on a second face of a second conducive substrate, and if the second face is a rough face of the second conductive substrate, the second line pattern is formed based on the mode that the second face is plated with the conductive material; a prepreg is arranged between the first face of the first conductive substrate and the second face of the second conductive substrate through press fit, so that a first board material set is formed; a third face of the first conductive substrate in the first board material set is etched so that the first line pattern can be exposed, and a fourth face of the second conductive substrate in the first board set is etched so that the second line pattern can be formed. According to the scheme, on the premise that the thickness of the prepreg in the PCB is controlled to the greatest extent, the voltage resistance of the PCB is improved.

The invention discloses a two-piece synchronous rectification diode. The two-piece synchronous rectification diode comprises a first framework, a metal-oxide-semiconductor field-effect transistor (MOSFET) chip, a control IC chip, a second framework and a built-in capacitor, wherein the second framework is provided with two external pins, the control IC chip is fixed on the second framework, the second framework is connected with an external wiring end of the built-in capacitor, the first framework is provided with an external pin, the MOSFET chip is fixed on the first framework, and the MOSFETchip and the control IC chip, the control chip and an internal wiring end of the built-in capacitor, the MOSFET chip and the second framework and the control chip and the first framework are connected by bonding wires. By the two-piece synchronous rectification diode, the structure is optimized, the available area of a PAD is integrated, and unfavorable structure defect easy to cause is removed.

The present invention relates to rope drums for winding and unwinding ropes, having a drum shell, to which end disks are fastened at the end faces, and to rope winches having such rope drums. The invention also relates to a method for producing such a rope drum. According to the invention, the drum shell is seamlessly rolled from an annular workpiece blank by means of a rope groove profile embossed in a non-cutting manner.