17results about How to "Precise control of shape" patented technology

According to the ginseng extraction system and method provided by the invention, the dual goals of high purity and high yield of ginsenoside extraction are achieved through raw material adaptive parameter pre-optimization, self-adaptive cascade purification and activity protection, the enrichment effect of high-value monomer saponin is remarkable, and the loss of active ingredients is accurately controlled. According to the application, a detection-decision-regulation full-process closed-loop intelligent control system is constructed, near infrared spectrum rapid screening and HPLC-MS / MS accurate quantitative dual-mode online detection are fused, real-time and accurate monitoring of the saponin content is realized, and off-line detection and artificial experience parameters are not needed; the multi-target central control unit can automatically decide a purification path and process parameters according to detection data, and designs such as membrane pollution on-line monitoring, automatic backwashing and solvent circulating preheating are combined, so that continuous operation of the process is ensured, and production interruption caused by equipment failure and process fluctuation is avoided.

The invention relates to the technical field of vanadium pentoxide preparation, and particularly provides a flake vanadium hot-pressing process which comprises three steps of dehydration and deamination treatment, high-temperature thermal decomposition and hot-pressing molding. According to the process, a hot stamping mode is used for replacing a traditional process, the process is simpler, powdery vanadium pentoxide is directly subjected to hot press forming, the solid-liquid-solid phase change process is not needed, energy consumption is reduced, meanwhile, the forming time of the flake vanadium is shortened, and the preparation efficiency of the flake vanadium can be effectively improved; and meanwhile, the density and the shape of the flake vanadium can be accurately controlled only by adjusting hot pressing parameters and a hot pressing mold, and products can be flexibly customized according to different application requirements.

This invention relates to lithium / sodium-ion battery technology, aiming to provide a negative electrode material utilizing few-layer MXene roll-up encapsulation of tin phosphide and its preparation method. The negative electrode material includes a few-layer T3C2 MXene as a load substrate and tin phosphide particles as active centers; the tin phosphide particles are uniformly dispersed in the few-layer T3C2 MXene, and the sheet structure of the T3C2 MXene encapsulates the tin phosphide particles within it through mechanical roll-up. This invention enables precise control of the particle size, morphology, and crystal phase of tin phosphide particles, mitigating the damage to the material structure caused by conventional processes and reducing energy consumption. This invention achieves uniform dispersion of tin phosphide particles in conductive MXene through in-situ growth, while the excellent encapsulation effect formed by ball milling effectively suppresses tin phosphide particle shedding, structural damage, and excessive interfacial side reactions, ensuring the structural stability and sufficient electrical contact of the negative electrode material during cycling, thereby improving charge-discharge cycle stability and rate performance.

The novel zoom indoor spotlight comprises a shell, a light source assembly, a focusing assembly and a lens assembly, and the focusing assembly comprises a rear lens, a front lens and a focusing mechanism; the small end of the rear lens is close to the light source assembly, and the surface of the small end is provided with a light inlet hole. A shaft hole is formed in the middle of the large-end surface of the rear lens, and a plurality of first annular concave-convex surfaces in a concentric ring array are arranged on the large-end surface; a rotating shaft rotationally matched with the shaft hole is arranged in the middle of the back surface of the front lens, and a plurality of second annular concave-convex surfaces arrayed by concentric rings are arranged at the non-middle position of the back surface; a plurality of first convex parts which are distributed circumferentially are arranged on the first annular concave-convex surface, and the surface of each first convex part is an arc-shaped convex surface; a first concave part is arranged at the position, corresponding to the first convex part, of the second annular concave-convex surface, and the bottom surface of the first concave part is an arc-shaped concave surface. The utility model has the characteristics of stable and accurate focusing, sealed and durable structure, small volume, wide application range, long service life and the like.

The invention relates to a multiphase composite flame-retardant waterproof coiled material and a preparation method thereof. The flame-retardant waterproof coiled material comprises an upper waterproof layer, a flame-retardant middle layer and a lower waterproof layer which are sequentially laminated and compounded from top to bottom, the upper waterproof layer and the lower waterproof layer are thermoplastic polymer layers; the flame-retardant middle layer comprises a base material layer, at least one first patterned flame-retardant layer combined on the upper surface of the base material layer and / or at least one second patterned flame-retardant layer combined on the lower surface of the base material layer, and a thermoplastic protective adhesive layer covering the surfaces of the patterned flame-retardant layers and the surface of the base material layer; the horizontal shape of the patterned flame-retardant layer is a two-dimensional area shape and corresponds to the plane outline of at least one fire risk area preset on the target laying surface.

The application belongs to the technical field of catalyst material preparation, and provides a single-atom porous material catalyst, a preparation method thereof and application of the single-atom porous material catalyst in a methane aerobic conversion reaction. The application introduces reaction gas containing a gaseous metal precursor, a carbon source and a nitrogen source into a plasma reaction chamber, and uses plasma for chemical vapor deposition to obtain the single-atom porous material catalyst. The preparation method provided by the application can select gaseous, liquid or solid raw materials as a source of the gaseous metal precursor. The application can prepare various types of single-atom porous material catalysts, and enriches the application range of the single-atom porous material catalysts. The application realizes control of the particle size, morphology and distribution of the single-atom porous material catalyst by adjusting reaction parameters, and the prepared single-atom porous material catalyst can be used in the methane aerobic conversion reaction. Therefore, the preparation method provided by the application is simple in operation, strong in universality and has a good industrial application prospect.

The application relates to a complex curved surface shock wave body counter-design method based on a three-dimensional curved flow surface method, and relates to a hypersonic wave body. The complex curved surface shock wave body is provided with a complex curved surface shock wave body lower surface compression profile, a complex curved surface shock wave body upper surface profile and a complex curved surface shock wave body leading edge profile; the complex curved surface shock wave body lower surface profile and the complex curved surface shock wave body upper surface are connected by the complex curved surface shock wave body leading edge profile. A complex curved surface three-dimensional outflow shock wave is specified, and a wave body capture profile is designed; the complex curved surface shock wave is dispersed into a series of initial flow surfaces; shock wave angles, shock wave curvatures and wave rear parameters are solved; a complex shock wave curved surface wave rear flow field is solved, and a compression profile is determined; a wave body upper surface geometric shape is constructed according to design requirements; and the upper and lower surfaces are connected to form a complete complex curved surface shock wave body geometric shape. The method has higher calculation efficiency and higher precision, and provides a wider performance improvement space for aircraft design through free shock wave selection.

The invention belongs to the technical field of water electrolysis hydrogen production catalysis, and particularly relates to a transition metal oxide (TMO)-rare earth oxide (REO) heterojunction nanocomposite as a water electrolysis anode oxygen evolution reaction (OER) catalyst, a transition metal oxide is used as an electron acceptor, a rare earth oxide is used as an electron donor, the transition metal oxide and the rare earth oxide form a tight heterojunction interface, and the hydrogen production efficiency is improved. According to the structure, a rare earth (4f)-oxygen (2p)-transition metal (3d) active unit is constructed, the electronic structure is effectively regulated and controlled through strong electron transfer between interfaces, the bonding stability of transition metal-oxygen is enhanced, the conversion from a traditional adsorbate precipitation mechanism to a lattice oxygen mechanism is realized, and the surface active site density is greatly improved by forming a nanoscale heterogeneous interface, so that the stability of the structure is improved. The OER catalytic performance and stability are improved; the overpotential of the composite material under the current density of 10 mA / cm is lower than 250 mV, the Tafel slope is smaller than 40 mV / dec, and the performance is superior to that of a commercial IrO2 catalyst.

This invention discloses an electro-optic modulator and its manufacturing method, belonging to the field of silicon photonics technology. The manufacturing method of the electro-optic modulator includes: providing a substrate; forming a first device pattern on the substrate; forming a protective layer flush with the top surface on the first device pattern and the substrate, wherein the first device pattern has a first region for ion implantation and a second region for ion implantation; forming a blocking pattern on the protective layer outside the first region, at least covering the second region; forming a first photoresist pattern on the protective layer for ion implantation of the first region, forming a first ion implantation region; removing the first photoresist pattern; forming a dielectric layer on the protective layer; and removing the dielectric layer on top of the blocking pattern; forming a second photoresist pattern on the dielectric layer, wherein the opening area of ​​the second photoresist pattern is not smaller than that of the blocking pattern; removing the blocking pattern; and performing ion implantation on the second region, forming a second ion implantation region. By setting the blocking pattern as an ion implantation mask and removing the blocking pattern in subsequent implantation, and then performing ion implantation again, two ion implantation regions with controllable spacing are formed, enabling the formation of a stable lateral PN junction structure.

The utility model discloses a horizontal bottom seat flexible interface double rubber ring reinforced concrete pipe production device relates to reinforced concrete pipe production technical field, and it is including: base, outer mould, inner mould, jacking mechanism and traction mechanism, and the inner mould is seamless hollow cylinder, and the inner mould is used to install in the outer film, to form the pouring space of double rubber ring reinforced concrete pipe between the outer mould and the inner mould, and one end of the inner mould is provided with jacking part, and the other end is provided with traction part, the jacking mechanism is set up in the one side of base, when the strength of double rubber ring reinforced concrete pipe reaches 70%~75% of design strength, and the jacking mechanism jacks up the jacking part to make the initial separation gap between the inner mould and double rubber ring reinforced concrete pipe, the traction mechanism is set up in the one side of base away from the jacking mechanism, and the traction mechanism is used for connecting with traction part to pull out the inner mould horizontally, simple structure, convenient to use, effectively solve the horizontal production process to face the inner mould demoulding problem, effectively improve the inner wall forming quality.

The invention discloses a board-level packaging structure and a manufacturing process thereof, the board-level packaging structure comprises a packaging body and a terminal, at least part of the terminal protrudes out of the surface of the packaging body, the side wall of the terminal is provided with a step-shaped structure, and a metal surface area capable of being wetted by welding flux is formed on the lower portion of the step-shaped structure. According to the invention, the wettability side surface is created through the step-shaped structure, so that the liquid solder can fully wet and wrap the side wall of the terminal, a firm, complete and void-free three-dimensional welding interface is formed, and the connection reliability is greatly improved; the effective welding area is increased, the interface thermal resistance is reduced, and the heat dissipation capability is improved; meanwhile, the firm lateral connection enhances the mechanical stress and thermal stress resistance of the packaging body, so that the power cycle life is prolonged, and the overall reliability is improved; on the basis of a mature board-level packaging process, only a pre-cutting step needs to be added before a final cutting process, so that the technological process is slightly changed, the equipment compatibility is high, the implementation is easy, and the cost is controllable.

The invention belongs to the technical field of magnetic resonance imaging nano diagnosis and treatment agents, and particularly relates to a preparation method of a shape-controllable nonmetal magnetic resonance imaging nano diagnosis and treatment agent. According to the preparation method, 2-(perfluorooctyl) ethyl methacrylate (HDFDMA) and methacrylic acid-2, 2, 6, 6-tetramethyl-4-piperidinyl ester (m-TEMPO) are taken as monomers to prepare shape-controllable sugarcoated haw-shaped nano-particles (WNPT), electronegative tannic acid (TA) is loaded after oxidation, and the shape-controllable sugarcoated haw-shaped nano-particles are prepared through a polymerization-induced self-assembly method. The nanometer diagnosis and treatment agent TA (at) WNPT with a magnetic resonance imaging (MRI) function and a colitis treatment function is obtained. According to the method disclosed by the invention, polymerization and assembly are synchronously carried out under the condition of high concentration, and the morphology, size and surface chemical characteristics of the nanoparticles are accurately regulated and controlled. It is proved for the first time that in the nonmetal MRI probe, compared with spherical particles, the sugarcoated haw-shaped structure can remarkably improve the MRI performance.

The application discloses a controllable preparation method and application of Janus structure phenolic resin and derived carbon material, and belongs to the technical field of materials. The Janus structure phenolic resin material has a bottle-shaped structure appearance; the bottle-shaped structure comprises a spherical-bottom bottle body and a bottle mouth in the shape of a droplet; and the bottle neck between the spherical-bottom bottle body and the bottle mouth is dumbbell-shaped with a shrinkage in the middle of the side contour. The application can controllably synthesize Janus structure nanomaterials with specific morphologies by constructing an oil-in-water microemulsion template and adjusting the assembly mode of polymer precursors at the oil-water interface, so that the Janus structure nanomaterials can meet the application requirements in different fields. The application solves the problems of complicated operation process and high requirements in the prior art, and simultaneously, the method is one-pot synthesis, does not need to remove the template twice, is simple in preparation, accurate in control, and green and environment-friendly. The obtained Janus structure phenolic resin material and derived carbon material have potential applications in the fields of energy storage and conversion, catalysis, environmental governance, biological medicine and the like.

This invention provides a novel method for preparing a self-supporting porous supercapacitor material, belonging to the field of supercapacitor electrode materials. The preparation method includes the following steps: immersing nickel foam in a corrosion solution containing iron salts and a sulfur source, then placing it within the coil of an alternating magnetic field induction heating device for in-situ corrosion reaction, generating an Fe-doped nickel-based composite on the pore walls of the nickel foam, thus obtaining a precursor; drying and oxidizing the precursor to obtain the novel self-supporting porous supercapacitor material; the sulfur source includes one or both of thiosulfate and thiourea; the nickel-based composite includes Ni(OH)₂ and Ni₃S₂; the nickel-based composite is a porous structure composed of nanoclusters; adjacent pores in the porous structure are interconnected. The synergistic effect of the thermal, electric, and magnetic fields of the alternating magnetic field accelerates corrosion kinetics, promotes the formation of a bicontinuous porous structure, and enhances the electrochemical energy storage performance of the material.

This utility model provides a turning tool device for notched sample machining, including an indexable insert, a tool holder, and a screw. The indexable insert and the tool holder are fixedly connected by the screw. The tool holder is a CNC external turning tool straight head tool holder, with a diamond-shaped insert mounting groove at the head. A threaded hole that mates with the screw is located in the center of the insert mounting groove. The indexable insert has a central through hole coaxial with the threaded hole in the middle. The insert is replaced and fixed by screwing through the screw and screwing it into the tool holder.

The invention discloses a preparation method of a SiC fiber reinforced BeO crucible, which is used for solving the problem that the toughness, thermal shock resistance and compactness of the existing BeO crucible cannot be considered at the same time, and the preparation method comprises the following steps: respectively pretreating SiC fiber and BeO powder; mixing and ball-milling the pretreated SiC fibers, BeO powder, a dispersant, a binder, a plasticizer and a sintering aid in a solvent to obtain mixed slurry, and granulating the mixed slurry to obtain a mixture; performing cold isostatic pressing on the mixture to obtain a green body; and carrying out heat treatment strengthening on the green body to obtain the SiC fiber reinforced BeO crucible. The SiC fiber reinforced BeO crucible prepared by the method disclosed by the invention is high in density, high in toughness and excellent in thermal shock resistance.

This invention proposes a spherical polylactic acid (PLA) powder with a wide sintering window, its preparation method, and its application. The preparation method includes the following steps: S1, mixing a poor solvent and PLA granules, adding the mixture to a reaction vessel, stirring, first heating, then holding at that temperature; S2, then cooling to 100-118°C, holding at that temperature for 30-60 minutes; S3, removing the product, washing and drying the product to obtain the spherical PLA powder. This invention is based on thermally induced phase separation, adding a spheroidization step to increase the crystallinity and sphericity of the PLA powder. The prepared spherical PLA powder has a particle size distribution of 10-120 μm and a bulk density of 0.3-0.45 g / cm³. 3 The powder possesses high fluidity, a wide sintering window, and excellent sintering performance, while retaining the excellent greenness and biocompatibility of polylactic acid. PLA parts formed by LPBF printing using the spherical PLA powder prepared in this invention exhibit good mechanical properties.