11results about How to "Solve preparation difficulties" patented technology

The utility model relates to a thin-strip spiral laminated bonded cone bottom cylinder type flywheel rotor. The flywheel rotor is mainly characterized in that circular ring laminations are made of continuous thin strips bent by a certain radian, a plurality of circular ring laminations are spirally laminated from bottom to top to form a cylinder with a conical bottom, and adjacent circular rings are adhered or welded together by using an adhesive to form a stable cone-bottom-shaped cylinder whole body, namely the flywheel rotor; the utility model mainly solves the problem that a large-size flywheel rotor is difficult to integrally construct and transport.

The application discloses a method for separating and purifying waxberry protoplasts. The method mainly comprises the following steps: culturing and obtaining sterile seedlings or cluster seedlings of the waxberry, and selecting tender new leaves at the top of the second to third leaves; cutting the leaves into strips and then placing the leaves in a permeation liquid for pretreatment; then placing the leaves in an enzymolysis liquid containing cellulase R-10, dissociation enzyme R-10 and pectinase Y-23, and performing enzymolysis under constant temperature, darkness and shaking conditions; and finally filtering through a cell sieve, centrifuging and resuspending to obtain the waxberry protoplasts. The yield of the protoplasts obtained by using the method is as high as 3.56x10 6 The application realizes efficient separation and purification of the waxberry protoplasts for the first time, and provides a key technical basis for molecular breeding and genetic improvement of the waxberry.

The invention belongs to the related technical field of advanced manufacturing of ceramic materials, and discloses ceramic powder with a reinforced phase coated with pyrolytic carbon and a preparation method and application of the ceramic powder. The method comprises the following steps that the reinforced phase is added into a solution obtained by mixing phenolic resin and ethyl alcohol, and turbid liquid is obtained; the current turbid liquid is heated to enable phenolic resin to be cracked, so that a pyrolytic carbon layer is formed on the surface of the reinforced phase, then the pyrolytic carbon-coated reinforced phase ceramic powder is obtained, and the ceramic powder is suitable for additive manufacturing. According to the invention, the pyrolytic carbon layer on the surface eliminates the characteristic of high specific surface energy of whiskers, fibers and nanoparticles, so that the stacking density and fluidity of the ceramic composite powder are improved when the ceramic composite powder is applied to additive manufacturing, and the problem that whisker, fiber and nanoparticle reinforced and toughened ceramic is difficult to manufacture based on a powder bed additive manufacturing technology is effectively solved; the comprehensive performance of the prepared ceramic powder is improved.

The present invention belongs to the field of EBSD sample preparation, and relates to a method for preparing a medium / high entropy alloy spherical powder by EBSD electrolytic polishing, comprising: mechanically mixing an iron-based amorphous spherical powder, a tin-bismuth alloy powder and a medium / high entropy alloy spherical powder to be tested to obtain a mixed powder; taking two metal plates with grooves, spreading the mixed powder in the groove of one metal plate, and then placing the other metal plate on the mixed powder to form a sandwich structure; after the sandwich structure is hot-pressed and solidified, a portion of one end of the metal plate located outside the groove is cut off to obtain a sample to be tested; one side of the cut metal plate is used as a surface to be tested, and after being polished and leveled, mechanical polishing and electrolytic polishing are performed to obtain the sample. The present invention can prepare medium / high entropy alloy spherical powder EBSD samples at low cost, high quality, large area, and high efficiency.

The invention discloses a biodegradable large-diameter intravascular stent and a preparation method thereof.The stent comprises a soft stent body and a hard stent body, the hard stent body comprises a woven fixing ring and a hard net pipe, and the soft stent body is connected with the hard stent body through the woven fixing ring; the other end of the woven fixing ring is fixedly connected with the hard net pipe; the large-diameter biodegradable stent has supporting force, prevents blood flow from being affected by vascular adhesion, has flexibility, adapts to the environment of blood vessel bending, and improves the treatment effect of the stent; the invention discloses a preparation method of a stent. The preparation method comprises the following steps: blow molding a hard stent pipe; performing laser cutting on the hard stent tube; weaving a soft bracket net body; the soft bracket is welded with a sealing end; spraying medicine on the surface of the stent; pressing, holding and forming the bracket; according to the stent packaging and the preparation method of the stent, the problem that the biodegradable large-diameter intravascular stent is difficult to prepare is solved, the stent can be used for large-scale production, and guidance is provided for manufacturing of other related products.

The invention discloses a preparation method and application of an ultrathin two-dimensional In2O3-In2S3 heterojunction. The preparation method comprises the following steps: S1, preparing flower-shaped In2S3 by adopting a hydrothermal method; s2, dispersing the flower-shaped In2S3 by using water as a solvent, and preparing an In2S3 nanosheet by using an ultrasonic stripping method; s3, taking the flower-shaped In2S3 prepared in the step S1, and carrying out annealing treatment at the temperature of 450-550 DEG C to obtain In2O3; the preparation method comprises the following steps: dispersing In2O3 by using water as a solvent, and preparing In2O3 nanosheets by using an ultrasonic stripping method; s4, ethylene glycol and ethyl alcohol are added into the In2S3 nanosheet solution, and an In2S3 solution is obtained; formamide and ethyl alcohol are added into the In2O3 nanosheet solution, and an In2O3 solution is obtained; the In2S3 solution is dropwise added to a silicon wafer preheated to 45 DEG C, after the solution is volatilized, the temperature of the silicon wafer is increased to 200 DEG C, the temperature is kept constant for 1 h, then the temperature is decreased to 45 DEG C, the In2O3 solution is dropwise added, and after the solution is volatilized, the two-dimensional In2O3-In2S3 heterojunction is formed on the silicon wafer. According to the invention, the problem that the two-dimensional ultrathin In2O3-In2S3 heterojunction material is difficult to prepare is solved, and a novel heterojunction preparation method is created.

The application discloses a kind of injection molding equipment and process of large-diameter polyethylene elbow.The equipment includes extruder, injection mold and mold driving system.Injection mold adopts coaxial 90-degree arc-shaped outer mold and inner mold assembly spliced by unit module to form closed forming cavity.Mold driving system is half-round guiding cage structure, and built-in power wheel driving mold is rotated in its interior according to half-round path.The extruder is connected with injection pipe of mold distribution cover, and polyethylene melt is continuously injected into forming cavity from bottom to top.The injection molding process is balanced feeding by multiple injection pipes, and forced cooling by spray pipe, to realize one-step injection molding of large-diameter polyethylene elbow.The equipment cooperates with corresponding assembly, injection molding, cooling, demolding and reassembly process steps, solves the forming problem of large-diameter PE elbow, and has the advantages of modularity, adjustability, high efficiency and good forming quality.

The invention discloses a preparation method for converting a facing heat conduction material into a vertical heat conduction material. The preparation method comprises the following steps: stacking the facing heat conduction material into a blank; processing the blank-shaped body into a sheet-shaped body along a vertical surface facing one extension direction of the heat conduction material; and the machined face of the sheet-shaped body is sealed through evaporation. According to the preparation method for converting the facing heat conduction material into the vertical heat conduction material, the heat conduction direction of the prepared vertical heat conduction material is perpendicular to the heat conduction direction of the original facing heat conduction material, and parameters such as the thickness and the area of the vertical heat conduction material can be adjusted according to design requirements.

The invention discloses an N-phase TLVR integrated inductor, a multi-phase module, an IPM with small parasitic inductance and a power supply system of a semiconductor chip, the integrated inductor and the IPM form the power supply system of the multi-phase module and the semiconductor chip, and the N-phase integrated inductor is provided with a copper sheet, so that the parasitic inductance of an input power loop and an auxiliary winding loop is small, and the parasitic inductance of the power supply is small. Therefore, the semiconductor chip power supply system has relatively low dynamic inductance so as to realize relatively fast dynamic performance, and has relatively high steady-state inductance so as to realize relatively high efficiency.

The application provides a method and device for preparing a three-dimensional atom probe needle tip of a low-Mohs hardness geological sample, and belongs to the technical field of material preparation. The method provided by the application comprises the following steps: depositing a Pt protective layer on a target region; milling the periphery of the Pt protective layer on the geological sample by using an ion beam to form a three-prism-shaped long strip sample, and transferring the three-prism-shaped long strip sample to a silicon column; tilting a sample table to make the direction of the ion beam be perpendicular to the top surface of the sample welded on the silicon column and downward, determining the size parameters of a ring cutting step and a ring-shaped ion beam, and performing multiple ring cutting on the sample on the silicon column until the sample on the silicon column is processed into a target shape. The method and device for preparing the three-dimensional atom probe needle tip of the low-Mohs hardness geological sample can make the complex ring cutting process be streamlined, reduce the preparation difficulty of the needle tip sample, and improve the operability and success rate of sample preparation by refining the ring cutting step and optimizing the size parameters of the ring-shaped ion beam.

The present invention provides a device and method for testing the multi-parameter drag reduction effect of a small aspect ratio pipeline, which relates to the field of drag reduction testing technology. The device comprises a water tank, an annular test pipeline connected to the water tank at both ends, and a pipeline to be tested; a temperature control component for adjusting the temperature of the liquid in the water tank is arranged in the water tank; the pipeline to be tested is detachably arranged on the annular test pipeline, and pressure sensors are arranged at both ends of the annular test pipeline; an injection device is also arranged on the annular test pipeline, and the injection device is arranged in front of the pipeline to be tested, including a first injection device for injecting an acid solution into the annular test pipeline, a second injection device for injecting an alkaline solution into the annular test pipeline, and a third injection device for injecting gas into the annular test pipeline. The present invention can realize the integration of the preparation of a polymer brush drag reduction coating in a pipeline with a small aspect ratio and the drag reduction effect test.