279results about How to "Change mechanical properties" patented technology

The invention relates to a method for extracting gas in low air permeability coal layer by pulse fracture anti-reflection, comprising the following steps: firstly using the blast-proof pulse-type coal layer high pressure water injector with adjustable frequency and pressure from the coal layer, high tunnel or low tunnel; using the pulse water effect generated by the periodical change of high pressure pulse water inside the drill hole of coal body, wherein the maximum pulse pressure is 35 MPa, the flow is about 300 L / min, and the pulse frequency is 0-1460 times / min; forcing the macroscopic fracture in the coal layer to be expanded and communicated; promoting the micro-pore fracture to be formed and extended; forming a new regeneration fracture net; providing a permeable channel of water inthe coal layer so as to achieve the effects of improving the mechanical property of the coal body, reducing the stress of the coal body in front of the working face and improving the discharge rate of the gas. Through the method, the pressure releasing range of the coal layer is enlarged, the whole pressure is adequately released, the radius of influence range of fracture can reach 10-40 m, and the air permeability of the coal body can be improved by 100-1000 times; and the method is simple, easy to operate and good in effect.

The invention discloses a method for preparing a non-metallic element doped carbon coated metal nanoparticle magnetic composite. The method comprises the steps that water-soluble metal divalent salt, a cyanamide compound and a nitrogen or boron or sulfur containing non-metallic compound are added into a methanol solution to be mixed, dissolved, dried and ground, and obtained homogeneous-phase powder is subjected to roasting pyrolysis under the protection of inert gas; and a pyrolysis product is subjected to acid pickling, washing, drying and grinding, and a target product is obtained. According to the whole preparing process of the method, metal ion reduction, metal nanoparticle coating and doping of nitrogen / boron / sulfur and other non-metallic elements are achieved in one step. The composite prepared through the method is high in degree of graphitization, good in dispersity between particles and high in purity, and the preparing method has the advantages that the cost is low, the process is simple, and large-quantity synthesis can be easily achieved.

A bone cement system (100) is provided having a mixing facility (10) for mixing and dispensing of bone cement, a reservoir container (112) for a monomer, and a conveyor (122). The mixing facility (10) has a mixing cylinder (20), which stores a bone cement powder. The monomer can be conveyed from the reservoir container (112) into the mixing cylinder (20) by the conveyor (122). A sieve element is (4) is arranged between the reservoir container (112) and the mixing facility (10), in order to prevent ingress of the bone cement powder from the mixing cylinder (20) into the conveyor (122). The mixing device (10) included a dispensing opening (23) for dispensing a bone cement mixed from the bone cement powder and the monomer. The dispensing opening (23) includes a shield (1) having at least one through-opening (2). The ratio of the area of the through-opening (2) to the area of the sieve element (4) is at least 1 to 3, and the distance between the shield (1) and the sieve element (4) is at least 1 mm.

The invention provides chemical-mechanical polishing systems, and methods of polishing a substrate using the polishing systems, comprising (a) an abrasive, (b) a liquid carrier, and (c) a positively charged polyelectrolyte with a molecular weight of about 15,000 or more, wherein the abrasive comprises particles that are electrostatically associated with the positively charged polyelectrolyte.

A sensor device includes an ultrasonic sensor and a sensor cover in the form of a foil, the ultrasonic sensor having an oscillatory sensor element, which is affixed inside a housing, having an end face, of the ultrasonic sensor, the ultrasonic sensor being able to be accommodated in a recess or bore hole of an external vehicle component, and the sensor element and the housing being able to be covered by the sensor cover on the outside, the sensor cover being mountable directly on the ultrasonic sensor and forming an at least essentially planar surface whose outline is adapted to the outline of the end face of the housing and coincides in an essentially flush manner with the end face of the housing of the ultrasonic sensor, and the sensor cover reflecting light having a color spectrum in the range of chrome color and a reflection capacity in the range of polished chrome.

The invention discloses a continuous carbon fiber reinforced crucible preform and a preparation method thereof. The preform is molded from basic unit layers and continuous fiber reinforced layers through needle punching; the bottom of a crucible and a connection area of the side and the bottom of the crucible are respectively reinforced by using the continuous fiber winding and laying technology, so the content of continuous fibers connected in an integral structure is effectively increased, strength needed during high load and high swelling stress conditions is guaranteed, cracking of the crucible or disconnection of the connection area of the side and the bottom of the crucible is prevented, and excellent shape stability can be maintained. Thus, the preform has excellent mechanical properties and a stable structure; after carbon / carbon composition, the crucible has good resistance to expansion, good structural stability, high thermal conduction efficiency and a long service life under a high load condition and can meet usage requirements of large-size crystalline silicon furnace crucibles.

The invention provides an outburst coal bed hydraulic phase change cracking cross-cut coal uncovering method, which is applicable to high-gas-outburst coal bed cross-cut coal uncovering operation. The minimum normal distance from the cross-cut coal uncovering working face to the coal bed is greater than or equal to 7m position, a plurality of holes are respectively drilled in the coal uncovering region, a conventional capsule hole sealing coal bed water injection technology is adopted for injecting water into the coal bed through the drilled holes, after the water injection completion, a conventional refrigeration freezing technology is adopted for freezing the coal bed around the water injection hole, in the freezing process, free water in the coal bed is gradually converted from the liquid state into the solid state, and the volume of the water expands for 9.1 percent in the phase change process; after the freezing completion, the freezing coal bed absorbs the underground environment head and gradually thaws. After the freezing thawing completion, the water injection hole and a gas extraction pipeline are connected for gas extraction, or the gas extraction drilling is implemented on the coal bed in the phase change cracking region for gas extraction. When the coal bed gas content is less than 8m<3> / t, the gas extraction is stopped, the water is injected into the water injection hole again, the secondary freezing of the coal bed is completed, and then, the coal bed is uncovered according to a conventional coal uncovering method.

The invention relates to a polyamide 66 membrane covered nickel-titanium alloy intravascular scaffold and a preparation method thereof. The intravascular scaffold comprises a nickel-titanium alloy scaffold and a polyamide 66 membrane, and is provided with a tubular blood vessel shaped structure or a cylindrical blood vessel shaped structure, wherein the surfaces of an inner wall and an outer wallof the scaffold are covered by thin membranes with the thickness between 0.2 and 5 millimeters. The preparation method comprises the following steps of: preparing 1 to 20 percent of polyamide 66 solution by using formic acid as a solvent; coating a layer of the polyamide 66 solution on a glass rod and volatizing the solvent; sleeving a nickel-titanium shape memory alloy expanding scaffold on the glass rod; coating another layer of the polyamide 66 solution on the glass rod and volatizing the solvent; and peeling off the polyamide 66 membrane and the nickel-titanium alloy intravascular scaffold from the glass rod, and performing vacuum drying to obtain the polyamide 66 membrane covered intravascular scaffold. The intravascular scaffold prepared by the method has a stable structure, good mechanical property, transportability and anti-seepage property, overcomes the performance defects of a single material, and has a simple preparation process.

The invention relates to a method of processing a fast powder sherardizing surface coating. A metal component is embedded in a metal powder sherardizing agent ceramic sherardizing can containing zinc powder or zinc / aluminum composite powder, put into a microwave heating furnace for microwave heat treatment when slowing rolling, cooled after temperature preserving, and taken out for post treatment. In the zinc / aluminum composite metal powder, the volume fraction of the aluminum powder is less than or equal to 40percent, and the rest is zinc powder. Composition of the metal powder sherardizing agent: the volume percent of the zinc powder or zinc / aluminum composite powder is 10 to 40percent; the volume percent of activating agent is 0 to 3percent; and the rest is SiO2 or AL2O3 filling agent. The filled ceramic sherardizing can is put into the microwave heating furnace for heat treatment. The invention uses microwave to obviously shortens the heating time, which is only 1 / 5 to 1 / 8 of that of traditional sherardizing technologies, saves more than 50 percent energy, greatly improves the production efficiency of the powder sherardizing processing, and reduces the manufacturing cost.

A multifunctional injection moulding machine is composed of a rotary bench with multiple work positions for moulds consisting upper and lower die plates and driven by motor via drive mechanism, and injection moulding unit, a mould closing unit, which is a pressure-holding high-pressure mould locking structure consisting of guide sleeve, beating rod, guide rod and upper and lower die plates, and a hydraulic system consisting of high-pressure cylinder and the booster installed in the center of said rotary bench.

A wearable article made from a nonwoven fabric that includes a plurality of coated fibers. The coated fibers have an exterior surface and a coating composition on at least a portion of the exterior surface. The coating composition includes an aminofunctionalized silane and a dialdehyde, where the weight percent of the dialdehyde in the coating composition is greater than the weight percent of the silane in the coating composition. The wearable article can be a wrap, brace, support, compression hosiery, bandage or compress. When worn, the wearable article is initially flexible but becomes rigid and stiff when the coated fibers experience a sudden force or impact. The wearable article does not include a fluid.

A freezing-type rock cross-measure coal uncovering method based on hydraulic seam cutting is suitable for a rock cross-measure coal uncovering operation in a high-gas outburst coal seam. The method includes following steps: (1) constructing a plurality of water injection holes into a coal uncovering operation surface at a position of the coal uncovering operation surface, wherein a minimum normal distance from the coal seam to the position is not less than 7 m; (2) performing hydraulic seam cutting to the water injection holes through a conventional hydraulic seam cutting technology; (3) when the hydraulic seam cutting is finished, connecting the water injection holes to a gas extraction pipe network to perform gas extraction; (4) when the content of gas in the coal seam is less than 8 m<3> / t, stopping the gas extraction; (5) constructing a freezing holes and a temperature measuring hole respectively at the two sides of the water injection holes; (6) sealing the holes through a capsule hole-sealing device; (7) injecting water into the coal seam through the water injection holes and closing valves when the water injection process is finished to enable the water injected into the coal seam to gradually seep into micro cracks in coal; (8) freezing the coal seam around the water injection holes through a conventional freezing technology to enable free water in the micro cracks in the coal seams to gradually convert from liquid phase into solid phase during the freezing process, so that a strength and an anti-impact performance of the coal are increased and an effect of solidification of the coal seam is achieved; and (9) uncovering the coal seam through a conventional coal uncovering method.

A bone cement system (100) is provided having a mixing facility (10) for mixing and dispensing of bone cement, a reservoir container (112) for a monomer, and a conveyor (122). The mixing facility (10) has a mixing cylinder (20), which stores a bone cement powder. The monomer can be conveyed from the reservoir container (112) into the mixing cylinder (20) by the conveyor (122). A sieve element is (4) is arranged between the reservoir container (112) and the mixing facility (10), in order to preventingress of the bone cement powder from the mixing cylinder (20) into the conveyor (122). The mixing device (10) included a dispensing opening (23) for dispensing a bone cement mixed from the bone cement powder and the monomer. The dispensing opening (23) includes a shield (1) having at least one through-opening (2). The ratio of the area of the through-opening (2) to the area of the sieve element (4) is at least 1 to 3, and the distance between the shield (1) and the sieve element (4) is at least 1 mm.