31results about How to "Density Requirements Reduced" patented technology

The invention discloses a densification method of a porous workpiece. The method comprises the following steps: placing the porous workpiece in a jacket, and performing seal welding on a joint between the jacket and an end cover; performing leak detection for the jacket; after the tightness of the jacket is ensured, filling glass powder in the jacket, and shaking to be solid; vacuumizing the jacket and performing seal welding on a suction pipe to obtain a compact; performing hot isostatic pressing treatment on the compact; and after a hot isostatic pressing hearth is cooled, taking out the compact, and removing the glass and the jacket from the surface of the workpiece to obtain a dense workpiece. The method with a metal jacket and glass powder as force transfer media, can be used for processing any porous workpieces with complicated shapes and relative density being less than 90%, and is particularly suitable for densifying sintering pieces and castings such as SLS/SLM and the like.

The invention relates to a sensor node locating method and device based on sequences. The sensor node locating method comprises the following steps that a sensor node to be located collects the signal strength indication values of a plurality of beacon nodes within the communication range; regional division is conducted according to the coordinate position of each beacon node and the communication range of each beacon node, and sorting is conducted on the signal strength in each region to obtain the signature sequences; a plurality of detection sequences and the signature sequences undergo matching calculation sequentially; the sensor node to be detected collects the coordinate positions of beacon nodes beyond a first jump range and the coordinate positions of a located quasi beacon node; a perpendicular bisector is respectively and sequentially drawn between each beacon node beyond the first jump range and a corresponding beacon node within the first jump range and between each quasi beacon node and a corresponding beacon node within the first jump range to obtain a final region to be located; the centroid of the region to be located serves as the coordinate position of the sensor node to be located. The sensor node locating method and device based on the sequences have robustness, have higher matching precision and lower the requirements for the intensity of the beacon nodes.

The invention discloses high-Mo Ni3Al-based monocrystal high-temperature alloy modified by rare earth and a preparation method of the high-Mo Ni3Al-based monocrystal high-temperature alloy and belongs to the technical field of high-temperature alloy. The alloy comprises Ni, Al, Mo, Re, Ta, Cr, C, Y and Dy or Ce, an alloy casting-state structure comprises three phase structures including the gamma' phase, the gamma phase and the white precipitated phase rich in Mo and Re, the density is 7.9-8.1 g/cm<3>, and the alloy can reach the complete oxidization resistance level or the oxidization resistance level or the secondary oxidization resistance level at the temperature of 1100 DEG C. The method comprises the steps of preparing a liquid metal cooling medium, preparing a mother alloy bar, preparing Ni3Al-based monocrystal alloy seed crystals not containing rare earth elements, preparing high-Mo Ni3Al-based high-temperature alloy containing the rare earth elements through a direction monocrystal furnace, and conducting post heat treatment. The Ni3Al-based monocrystal high-temperature alloy provided by the invention is low in density and can meet the low-density requirement of aircraft engines, and the oxidization resistance of the alloy can reach the complete oxidization resistance level or the oxidization resistance level or the secondary oxidization resistance level at the temperature of 1100 DEG C.

The invention provides a 1S1R memory integrated structure and a preparation method thereof. The 1S1R memory integrated structure comprises a word line metal, a resistive change material layer, a gatetube lower electrode, a gate tube material layer, a gate tube upper electrode, an interconnecting wire and a bit line metal, wherein the gate tube material layer is in the shape of a groove, and the gate tube upper electrode is formed in the groove. According to the 1S1R memory integrated structure and the preparation method thereof disclosed by the invention, the device area of a gate tube is much bigger than that of a memory through the change of the integrated position of the gate tube, so that the requirement on the ON state current density of the gate tube is reduced obviously.

The invention discloses a multi-accuracy node positioning method based on area judgment. The multi-accuracy node positioning method based on area judgment comprises the steps that firstly, a fingerprint information difference value of a beacon node is calculated; secondly, an initial clustering center and the residual beacon nodes are clustered; thirdly, the deployment mode of the beacon nodes is judged; fourthly, a first-stage virtual block not deployed evenly is divided; fifthly, a first-stage virtual block deployed evenly is divided; sixthly, a second-stage virtual block not deployed evenly is divided; seventhly, a second-stage virtual block deployed evenly is divided; eighthly, a positioning tree based on whole-network beacon node distribution characteristics is built; ninthly, unknown nodes are positioned. The multi-accuracy node positioning method based on area judgment has low requirements for the density of beacon nodes in a monitoring area, can realize fine grit positioning, and can obtain the survival data of wild animals more conveniently and flexibly, thereby carrying out effective protection.

The indoor positioning system comprises a to-be-positioned mobile terminal which is arranged indoors; mobile terminals which are movably arranged indoors, wherein each mobile terminal is used for broadcasting information in a communication range of the mobile terminal if the mobile terminal is static within a preset time and meets a preset condition so as to calculate position information of other mobile terminals and the mobile terminal to be positioned; at least three access points, wherein each access point has fixed position information; and a positioning server in communication connection with the mobile to-be-positioned terminal, the mobile terminals and the access points, wherein the positioning server is used for determining the position information of the to-be-positioned mobile terminal if the number of target access points of the to-be-positioned mobile terminal searched in the access points in a broadcast manner and the number of target mobile terminals of the to-be-positioned mobile terminal searched in the mobile terminals in the broadcast manner is greater than or equal to 3. The invention further provides an indoor positioning method and the mobile terminals, and the requirement for the density of the access points can be reduced.

The invention provides a rhenium-containing Ni3Al-based single crystal alloy, which comprises the following components in percentage by weight: 7 to 8 percent of Al, 8 to 13 percent of Mo, 0.0005 to 3 percent of Re and the balance of Ni; and the rhenium-containing Ni3Al-based single crystal alloy also can contain more than one of 0.05 to 0.5 percent of Dy, 0.1 to 1 percent of Y and 0.05 to 0.5 percent of Hf. In the rhenium-containing Ni3Al-based single crystal alloy, the rhenium element is added into a Ni3Al-based single crystal alloy, so that the rhenium element is subjected to solid solution in a gamma' phase and a gamma phase and forms a rhenium atom cluster in short range order in the gamma phase. At high temperature, the diffusion coefficient of rhenium in the gamma phase and the gamma' phase is small, the diffusion coefficients of other alloy elements such as Al, Mo and the like in the gamma phase and the gamma' phase can be reduced, and the high temperature stability of the alloy is improved.

The invention discloses a low-density foaming BMC material. The material comprises the following components in parts by weight: 60-70 parts of unsaturated resin, 1-2 parts of thermal expansion microspheres, 0.5-1 part of a foaming agent, 30-40 parts of a low-shrinkage additive, 0.7-1 part of a polymerization inhibitor, 1-2 parts of a wetting dispersant, 3-4.5 parts of color paste, 1-1.5 parts of athickening agent, 1-1.2 parts of a curing agent, 4-5 parts of a release agent, 100-120 parts of aluminum hydroxide, 50-80 parts of calcium bicarbonate and 20-60 parts of glass fibers. According to the invention, the density of the BMC product is effectively reduced, the material cost is greatly reduced, and the obtained BMC material has good mechanical properties and meets the expected low-density requirement.

The invention relates to the field of medical suction or drawing instruments, and particularly discloses an exhaust device for endoscopic surgery. The exhaust device comprises a body, wherein a partition plate is arranged in the middle of the body, the partition plate divides the internal space of the body into a first cavity and a second cavity which are mutually independent, the top end of the first cavity is provided with a first pipe body and a second pipe body, the top end of the second cavity is provided with a third pipe body and a fourth pipe body, one end of the first pipe body and one end of the third pipe body both extend to the bottom end of the body, one end of the second pipe body and one end of the fourth pipe body both extend to the top end of the body, the second pipe body is connected with the third pipe body, and a filter element is arranged in the second cavity. The invention further discloses an exhaust method for the endoscopic surgery. According to the invention, a filter element can filter harmful smoke containing particulate matters such as PM2.5 and PM10 in gas, meanwhile, peculiar smell can be removed, and the healthy environment of the medical staff in the surgery process is guaranteed.

The invention relates to a thread machining method, in particular to a ceramic-based composite thread machining method. The technical problems that an existing ceramic-based composite material thread machining method is poor in thread quality, poor in thread machining quality stability, short in thread service life and the like are solved. The thread machining method comprises the following steps: 1) weighing rosin, alum and boron carbide powder according to a certain mass ratio; 2) adding the rosin and the alum into a container, heating until the rosin and the alum are completely melted, then adding the boron nitride powder, and heating until a viscous glue solution is formed; (3) the ceramic-based composite part is polished, cleaned and dried; (4) the to-be-machined thread part is coated with a glue solution; (5) thread machining is conducted after the glue solution is cured; (6) the ceramic-based composite part obtained after thread machining is completed is subjected to high-temperature treatment, and the glue solution is removed; and (7) silicon carbide coating deposition is conducted on the surface of the ceramic-based composite part, and the completely-machined ceramic-based composite part is obtained.

The invention relates to a method for producing a synthetic quartz material for a semiconductor mask plate. The method comprises the following steps: (1) depositing a silicon source on a guide rod by adopting a vapor phase axial deposition method to obtain a low-density SiO2 loose body; wherein in the deposition process, the interior of the deposition cavity is controlled to be in a negative pressure environment, and the temperature is not higher than 500 DEG C; (2) transferring the low-density SiO2 loose body into a sintering furnace, and heating to 1100-1300 DEG C in a closed environment filled with dehydroxylation airflow and oxygen so as to dehydrate the low-density SiO2 loose body; (3) in an inert gas environment, introducing fluorine-containing gas into the sintering furnace, and heating to 1400-1600 DEG C, so that the low-density SiO2 loose body is vitrified to form transparent quartz glass; in the dehydration and vitrification process, the low-density SiO2 loose body is kept not moving in the longitudinal direction, and the longitudinal and radial temperature gradient in the deposition cavity is smaller than or equal to 2 DEG C; and (4) annealing the transparent quartz glass to obtain the synthetic quartz material. According to the method disclosed by the invention, the continuity of the production process is high, and T170-193nm of the synthesized quartz product is greater than or equal to 95%.