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1410results about How to "Improve ductility" patented technology

Vertical mixed connection structure and method of prefabricated internal wallboards for assembling shear wall structure

InactiveCN102433945AGuaranteed shear resistanceImprove ductilityWallsShock proofingRebarWall plate
The invention discloses a vertical mixed connection structure and method of prefabricated internal wallboards for assembling a shear wall structure. On the structure, edge components of upper-layer and lower-layer prefabricated internal wallboard structures are overlapped through vertical steel bars and U-shaped ribs, and horizontal reinforcing ribs and local cast-in-place concrete are arranged in a closed ring so as to realize the edge components equivalent to the cast-in-place concrete, the vertically distributed steel bars at the middle part of the components are connected in a manner of indirect overlapping by use of mortar anchor steel bars of a retention metal mortar anchor pipe so as to form an entire shear wall. By utilizing the local cast-in-place concrete moist joint at the edgecomponent part formed by the mixed connection and the dry joint of bedding and grouting at the part of the vertically distributed steel bars, the shear strength and rigidity of the horizontal jointing part of the prefabricated internal wallboards are improved; casting holes reserved at the bottom of the edge components can be used for solving the problem of casting the local cast-in-place concrete; and the vertically distributed steel bars are connected in a manner of indirect overlapping by use of the mortar anchor, which facilitates the installation and temporary fixation of the wallboards on a concrete floor. The mixed connection structure of the prefabricated internal wallboards, provided by the invention, ensures the overall performance of the shear wall; and construction is convenient.
Owner:SOUTHEAST UNIV

Packaging structure and packaging method for fingerprint recognition chip

The invention discloses a packaging structure and a packaging method for a fingerprint recognition chip. The packaging structure comprises a substrate, a sensing chip, a plurality of wires and a plastic package layer. The substrate is provided with a first surface, and the first surface of the substrate is provided with a first welding pad layer. The sensing chip is located on the first surface of the substrate and provided with a first surface and a second surface, the second surface of the sensing chip is located on the first surface of the substrate, the first surface of the sensing chip is provided with a sensing area and a peripheral area, and the surface of the portion, in the peripheral area, of the sensing chip is provided with a second welding pad layer. The two ends of the wires are electrically connected with the first welding pad layer and the second welding pad layer respectively, the wires have top points with the maximum distance to the surface of the substrate, and a first distance is reserved between the top points and the first surface of the sensing chip. The plastic package layer is located on the surface of the substrate and the surface of the sensing chip and surrounds the wires and the sensing chip, and a second distance is reserved between the surface of the plastic package layer and the first surface of the sensing chip and is larger than the first distance. According to the packaging structure, the requirement for the sensitivity of the sensing chip is lowered, and application is wider.
Owner:CHINA WAFER LEVEL CSP

High-strength cold-rolled hot-galvanized dual-phase steel plate and manufacture method thereof

The invention discloses a high-strength cold-rolled hot-galvanized dual-phase steel plate, characterized in that components, in mass percentage, are: 0.03% to 0.15% of C, less than or equal to 0.15% of Si, 1.00% to 1.75% of Mn, less than or equal to 0.015% of P, less than or equal to 0.012% of S, 0.02% to 0.15% of Al, 0.35% to 0.75% of Cr, 0.02% to 0.15% of Cu, 0.010% to 0.035% of Ti, less than or equal to 0.005% of N, in addition meeting the requirement that the total percentage of Mn, 1.29Cr and 0.46Cu is not less than 1.5% and not more than 2.5%, and the balance being Fe and inevitable impurities. The manufacture method comprises converter smelting, secondary refining, continuous casting, hot continuous rolling, cold acid continuous rolling, annealing galvanizing and hot dipping, wherein a galvanized substrate with a reasonable organization and composition and an excellent plate shape is obtained through controlled rolling and controlled cooling while rolling; and through employing a micro-slowly cooling way for heating from an end segment to an isothermal segment and a secondary fast cooling way for a fast cooling segment during continuous annealing galvanizing, the cold-rolled hot-galvanized dual-phase steel plate is obtained, wherein the steel plate is advantageous by having a tensile strength between 490 to 700 MPa, well-matched strength and ductility, an excellent coating performance, and a thickness between 0.5 to 2.5 mm, and can be used as an automobile cover component, an inner plate, a structural component, etc.
Owner:ANGANG STEEL CO LTD

Hollow interlayer pipe wall compound steel pipe concrete wind power tower with ribs

The invention discloses a hollow interlayer pipe wall compound steel pipe concrete wind power tower with ribs. The tower comprises a cast-in-place reinforced concrete foundation and a steel pipe concrete tower section set. Steel pipe concrete tower sections are connected through horizontal flange discs to form a vertical tower cylinder, meanwhile, the bottom of the tower cylinder is fixed on the cast-in-place reinforced concrete foundation, the steel pipe concrete tower sections comprise inner steel pipes, outer steel pipes and concrete layers cast in the interlayers between the inner steel pipes and the outer steel pipes, first reinforced ribs are arranged on the peripheries of the outer walls of the inner steel pipes, and second reinforced ribs are arranged on the peripheries of the inner walls of the outer steel pipes. Compared with an existing steel tower, the compound steel pipe concrete structure with a hollow interlayer and with the pipe walls provided with the ribs is used, the reinforced ribs are arranged on the pipe wall sides where the inner steel pipes and the outer steel pipes are in contact with concrete, the interface binding force of the steel pipes and the concrete is enhanced, the bearing capacity and the ductility of the tower are improved, and early local buckling damage of the thin-wall steel pipes can be avoided or delayed.
Owner:HOHAI UNIV

Preparation method of ultrafine grain rare earth magnesium alloy

The invention provides a preparation method of an ultrafine grain rare earth magnesium alloy. The method comprises the following steps of: firstly performing solution treatment on a rare earth magnesium alloy cast ingot to obtain the rare earth magnesium alloy after the solution treatment; then performing heat deformation processing on the obtained rare earth magnesium alloy after the solution treatment to obtain a heat-deformed rare earth magnesium alloy plate, wherein the heat deformation processing temperature is 350 DEG C-450 DEG C; and finally performing accumulative roll bonding with the single-pass rolling reduction of 50% on the obtained heat-deformed rare earth magnesium alloy plate, and annealing to obtain the ultrafine grain rare earth magnesium alloy. According to the preparation method provided by the invention, a heat deformation processing-accumulative roll bonding compound process is firstly adopted to successfully prepare the ultrafine grain rare earth magnesium alloy, and the problem of deterioration of mechanical properties, which is caused by non-uniform distribution of thick and big LPSO (long period stacking ordered) phases in the alloy is effectively solved; and furthermore, the preparation method provided by the invention has the advantages of simple process flow and low equipment cost, and is favorable for further large-scale industrial production.
Owner:XINJIANG TENGXIANG MAGNESIUM PROD CO LTD

Method for preparing ultra-fine crystal grain high-strength high-toughness copper alloy strip

The invention discloses a method for preparing an ultra-fine crystal grain high-strength high-toughness copper alloy strip. The method comprises the following steps of: performing hot-rolling with the distortion of 40 to 70 percent after performing high-temperature annealing on a copper alloy cast ingot to obtain a plate blank; performing cold-rolling with the distortion of 30 to 60 percent; performing intermediate annealing after the cold-rolling; after soaking the plate blank in liquid nitrogen for 5 to 30 minutes, taking the plate blank out and performing the cold rolling immediately; performing cryogenic treatment and the cold-rolling repeatedly after performing the cold-rolling; after accumulated strain capacity reaches 40 to 90 percent, performing low-temperature annealing to obtain the ultra-fine crystal grain high-strength high-toughness copper alloy strip with the average size of about 0.8 mu m, wherein the tensile strength of the copper alloy strip is 650 to 880 MPa and the elongation rate is 10 to 30 percent. The method has a simple production process and low processing cost, and can implement cold-deformation and annealing after the cryogenic treatment on a copper alloy on conventional production equipment; crystal grains are thinned by generated deformation twin and annealing twin, simultaneously both the strength and the tensility of the copper alloy are improved; therefore, the method has a very good industrial application prospect.
Owner:CENT SOUTH UNIV

Insecticidal suspending agent containing dinotefuran and preparation method of insecticidal suspending agent

The invention provides an insecticidal suspending agent containing dinotefuran. The suspending agent is characterized by being prepared from the following components in mass percentage: 1-30% of the dinotefuran, 0.1-35% of a second active component, 3-9% of a wet dispersant, 0.1-0.5% of a de-foaming agent, 1-6% of an anti-freezing agent, 0.1-4% of a thickening agent, 0.1-0.5% of a preservative, 0-2% of a pH (Potential of Hydrogen) adjusting agent, 0-2% of an antioxidant, 0.5-5% of a functional auxiliary agent and the balancing being water, wherein the second active component is one of bifenthrin, imidacloprid, methylamino abamectin benzoate, cyhalothrin, thiamethoxam, indoxacarb, chlorfenapyr, acetamiprid and ethiprole. According to the insecticidal suspending agent, special components are selected and the content of each component is strictly limited; and the prepared insecticidal suspending agent has the very good fast-acting property and lasting period and has the very good prevention effect on tea lesser leafhopper, aleyrodid, thrips, aphids and the like. After the functional auxiliary agent is added, the insecticidal efficacy is improved by 10-12% when being compared with a medicament which is not added with the functional auxiliary agent.
Owner:广东顾地丰生物科技有限公司 +1

Dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy anticorrosive coating and preparation method thereof

The invention discloses a dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy anticorrosive coating and a preparation method thereof. Compositions of the coating mainly comprise dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy emulsion, anticorrosive pigment and filler, pigment dispersing agent, a film forming aid, a water-based additive, a cross-linking curing agent and deionized water, wherein the dendritic organic-inorganic hybrid water-borne nano polyurethane-epoxy emulsion is prepared by the following steps: prepolymerizing a polyurethane hydrophilic branch; preparing a dendritic polyurethane intermediate product by adopting hyperbranched synthesis technology; inoculating organic-inorganic hybrid into a nano material by adopting a in-situ polymerization; and simultaneously grafting epoxy resin with hydroxyl; and the prepared emulsion is compounded with the anticorrosive pigment and filler and the like to prepare the anticorrosive coating. The anticorrosive coating radically solves the VOC pollution problem of solvent-type anticorrosive coating, and simultaneously solves a series of problems such as poor roughness, weatherability, ageing resistance, alkali resistance and solvent resistance of the conventional water-borne anticorrosive coating.
Owner:SICHUAN UNIV +1

General material coding method capable of coding according to user-defined rule

The invention discloses a general material coding method capable of coding according to user-defined rule, belonging to the field of material management. The method is characterized by decomposing the composition of material codes into a plurality of sections, wherein each section is a code name for describing a certain feature of the material. The method comprises the following steps of: making a coding rule, specifically, extracting a plurality of key feature description fields of each type of material so as to make rule basis for converting the key feature description filed into corresponding code for each feature field; and coding according to the rule, specifically, extracting each key feature description attribute of a certain provided material according to the description information of the material, converting the key feature description attribute into a feature description code name of the section, finally, combining the code names of each feature description filed together so as to form a material serial number for uniquely describing the material. In comparison with the prior art, the coding method disclosed by the invention solves the problem that coding products have no generality, so that change of the coding rule is no longer limited by program codes. The general material coding method capable of coding according to user-defined rule is a general coding way more than being just restricted to material coding.
Owner:INSPUR COMMON SOFTWARE

Method for widening steel-concrete combination

The invention relates to a method for widening a steel-concrete combination, which is a technological method for widening an original concrete bridge. The method widens the original concrete bridge by adopting an integrally and jointly stressed steel-concrete composite beam comprising a concrete bridge deck and a steel beam. The method comprises the following steps: firstly roughening and reinforcing bar loading treatments are carried out on the main beam of the original bridge, a steel plate-concrete composite anchoring and connecting piece is arranged to connect the main beam with the transverse connecting steel beam of the original bridge; the main beam of the original bridge is connected with the steel-concrete composite beam into a whole body through the transverse connecting steel beam; roughening and transverse connecting reinforcing bar loading are carried out on the bridge deck of the original bridge, the bridge deck of the original bridge is extended to the upper bridge deck area of a widened beam, and the widened bridge deck is concreted to form a whole body. Compared with a traditional widening method, the method has the advantages that the structural height can be reduced, the structural dead weight can be reduced, and the lower structural cost can be reduced. Meanwhile, the composite beam is convenient to be produced, the installation quality is high, the construction is economic, convenient and fast, the influence to the normal traffic of the current bridge is small, and the deficiency of the method for widening the traditional concrete beam is overcome.
Owner:TSINGHUA UNIV
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