148results about How to "Efficient preparation" patented technology

The invention discloses a tunnel-pile interaction experiment method and device based on a 3D printing technology, and belongs to the technical field of civil engineering underground structure tests. The method comprises the steps that the geometric and mechanical similarity ratio is determined according to an engineering prototype, a tunnel lining model and a pile group model are prepared through the 3D printing technology, and controllable adjustment of the rigidity of the tunnel model is achieved by adjusting the type, the filling rate and the internal structure of a printing material; controllable adjustment of the rigidity of the pile foundation model is realized by adjusting the size of the magnetic field; the model is placed in a soil body groove, the shield tunnel excavation process is simulated, and deformation data of a tunnel and a pile foundation are collected through a PIV technology and a sensor. Accurate control over the rigidity of the tunnel and pile foundation model is achieved through 3D printing, the influence of shield tunnel construction on the pile group foundation can be simulated under the condition that the similarity criterion is met, and the device has the advantages of being adjustable in structure, high in experiment efficiency and the like and can be used for researching a dense urban area tunnel-pile deformation coupling mechanism and optimizing related engineering parameters.

The application discloses a gallium oxide vertical device and a preparation method thereof. The gallium oxide vertical device comprises an epitaxial structure, a cathode and an anode matched with the epitaxial structure, the epitaxial structure comprises a heavily doped n-type Ga2O3 substrate, a lightly doped n-type Ga2O3 drift region, an interlayer and a p-type nitride epitaxial layer which are sequentially stacked, the lightly doped n-type Ga2O3 drift region, the interlayer and the p-type nitride epitaxial layer form a p-i-n structure, the cathode forms an ohmic contact with the heavily doped n-type Ga2O3 substrate, and the anode forms an ohmic contact with the p-type nitride epitaxial layer, wherein the material of the interlayer is an Al-containing compound, and the surface layer region of the lightly doped n-type Ga2O3 drift region close to the interlayer also has Al elements, the Al elements are diffused into the lightly doped n-type Ga2O3 drift region in the bonding process under high pressure.

The invention discloses a platinum-based high-entropy alloy self-supporting catalyst as well as a preparation method and application thereof. The preparation method of the catalyst comprises the following steps: S1, dissolving a platinum source, an iron source, a cobalt source, a molybdenum source and a manganese source in a solvent according to the molar ratio of platinum to iron to molybdenum to cobalt to manganese being 1: 1: 1: 1: 1 to obtain a precursor solution; s2, dipping the carbon felt in a polyvinyl alcohol solution, and drying to obtain a substrate; and S3, dipping the substrate in the precursor solution, drying, and carrying out Joule heat flash evaporation to obtain the catalyst. According to the invention, five metals are added according to an equal molar ratio, the catalytic efficiency of the water electrolysis catalyst is improved by utilizing a high-entropy effect, the production cost of the catalyst is reduced, meanwhile, the long-time stability of the catalyst is improved by adding a self-supporting material, and an efficient and stable water electrolysis process in an acidic electrolysis environment is realized.

The invention provides an R-type transaminase mutant and application thereof, and compared with an amino acid sequence of wild-type transaminase as shown in SEQ ID NO.1, the mutant has mutation of a 62nd site, a 152nd site and a 155th site. The mutant has high catalytic activity and excellent stereoselectivity on a heterocyclic ketone substrate, and can be used for efficiently preparing R-configuration heterocyclic chiral amine.

The application discloses a method for automatically improving separation efficiency of an amino graphene preparation system, and relates to the technical field of graphene preparation.The preparation system comprises a graphene preparation detection module, a primary reaction detection module, a middle reaction detection module and a reminding adjustment display module; the graphene preparation detection module, the primary reaction detection module and the middle reaction detection module are used for detecting and controlling reaction temperature, time, reactant quality and other parameters in the process of preparing amino graphene, so as to obtain a first coefficient DYxs1, a second coefficient DYxs2 and a third coefficient DYxs3; the first coefficient DYxs1, the second coefficient DYxs2 and the third coefficient DYxs3 are compared and analyzed with threshold values after being corrected by the reminding adjustment template, an adjustment scheme is obtained, a control command is generated according to the adjustment scheme, accurate control and optimization are performed, and then efficient preparation and separation of amino graphene are realized, and the preparation and separation effect of the amino graphene is improved.

This invention discloses a transition metal phosphide catalyst, its preparation method, and its application, belonging to the field of electrocatalysis technology. The process includes: firstly, dissolving nickel salt, lanthanum salt, urea, and ammonium fluoride in deionized water to synthesize a nickel-lanthanum layered hydroxide nanosheet precursor via a hydrothermal method; secondly, preparing a lanthanum-doped nickel phosphide catalyst using a phosphating reaction; and thirdly, utilizing a lanthanum doping strategy to modulate the electronic structure of nickel phosphide and improve its electrocatalytic reaction performance. This lanthanum-doped nickel phosphide material exhibits good catalytic activity when used to catalyze hydrogen evolution and sulfide ion oxidation reactions. In an integrated two-electrode electrolyzer for sulfide ion oxidation-assisted hydrogen production, it outputs 10 mA cm⁻¹. ‑2 This invention achieves the goal of producing hydrogen and high-value-added sulfur products with low energy consumption by requiring a relatively low voltage of 0.525 V at a current density. It has advantages such as simple preparation process, controllable operating conditions, and low raw material costs, possessing the potential for large-scale production and serving as a high-performance catalyst for electrocatalytic hydrogen production and sulfur ion oxidation reactions.

The application belongs to the technical field of food preparation, and relates to a preparation method of PE emulsion prepared from citrus peel residues and high-dietary-fiber fat-reducing mayonnaise. The preparation method of the PE emulsion is as follows: (1) the dried and crushed citrus peel residues are soaked and pretreated with acidic oxidized electrolytic water, and after the soaking is completed, the activated materials are obtained by washing, drying and sieving; (2) the activated materials are mixed with water and then subjected to water bath heating treatment, and the citrus peel residue fiber concentrate is obtained by drying the residue; (3) the citrus peel residue fiber concentrate is dispersed and then subjected to colloid mill pretreatment and wet ball milling, and the citrus peel residue-based colloid suspension is obtained after the wet ball milling; and (4) the citrus peel residue-based colloid suspension is mixed with vegetable oil and then subjected to shearing homogenization to obtain a coarse emulsion, and then the coarse emulsion is subjected to ultrasonic treatment, and finally the citrus peel residue-based PE emulsion is obtained. The problems of unstable structure, easy oxidation, poor storage stability and poor taste of the fat-reducing mayonnaise prepared by using the PE emulsion are solved.

The present application belongs to the technical field of fruit by-product processing, and particularly relates to a method for extracting cellulose, pectin and polyphenol from pear by-product. The present application utilizes the thermo-mechanical-chemical effect of steam explosion to treat the pear by-product through steam explosion, so that most of hemicellulose and lignin can be removed, and the cellulose, pectin and polyphenol can be efficiently and rapidly extracted, thereby shortening the production cycle of the cellulose, pectin and polyphenol and improving the efficiency. Furthermore, the present application uses a combination of choline chloride and ethanol as a low eutectic solvent, and compared with other types of hydrogen bond acceptors and hydrogen bond donors, the polyphenol extraction effect is the most significant. The present application provides a method for laying a foundation for further development and utilization of pear residue cellulose, pectin and polyphenol, and improves the comprehensive utilization rate of pear processing by-products.

The utility model discloses a cable grid bridge system comprising a turning bridge which is composed of a plurality of bridge units arranged in a divergent manner to form an inner arc structure and an outer arc structure. Each bridge unit comprises two parallel U-shaped wefts and a plurality of radial line units, each U-shaped weft is composed of an outer vertical beam, a bottom beam and an inner vertical beam, and each radial line unit comprises a bottom radial line unit, an outer diameter line unit and an inner diameter line unit which are respectively connected to different parts of the corresponding U-shaped weft; the outer diameter line units are connected to form a continuous bridge outer diameter line; the inner vertical beams of the adjacent bridge units abut against each other, the inner diameter line unit is provided with two ends, reinforcing ribs are welded between the bottom beams, a bridge bottom diameter line is formed, and therefore the turning bridge system is low in cost and convenient to manufacture.

The invention discloses a chromium-free pretreatment solution, a chromium-free color-coated sheet and a preparation method of the chromium-free color-coated sheet, and belongs to the technical field of metal material surface treatment and protective coatings. The pretreatment liquid comprises a water-soluble carboxyl-containing organic matter, phosphate, a strong oxidant and inorganic acid, and is prepared through step-by-step mixing, and a compact pretreatment layer is formed on the surface of the hot-dip galvanized sheet by utilizing the synergistic complexing effect among the components. The pretreatment liquid is applied to a base plate in a roller coating mode, after curing is conducted at the temperature of 70-150 DEG C, chromium-free primer, finish paint and back paint are sequentially applied, and the chromium-free color-coated plate is obtained after baking. The obtained color-coated sheet has excellent corrosion resistance and adhesive force, the color-coated sheet is chromate-free in the whole process, and the dual requirements for environmental protection and performance in the fields of household appliances and the like are met.

The invention relates to the technical field of organic chemistry, in particular to a method for synthesizing a benzothiophene coupling product through a non-metal-participated anchoring-migration strategy. The method comprises the following steps: taking a benzothiophene compound or a benzothiophene sulfoxide compound as a reaction substrate, mixing the reaction substrate with an aryl nucleophilic reagent in the presence of an anhydride activator and a solvent, and carrying out nucleophilic substitution reaction to obtain benzothiophene sulfonium salt; the preparation method comprises the following steps: mixing benzothiophene sulfonium salt with an organic solvent, and carrying out metal-catalysis-free intramolecular migration reaction to form a carbon-carbon bond at the C2 site of benzothiophene, thereby obtaining the benzothiophene coupling product. The preparation conditions are mild, the operation is simple and convenient, a traditional oxidation addition-reduction elimination process is replaced by an anchoring-migration strategy, protection of a noble metal catalyst, a complex ligand, strong base or inert gas is not needed, and the problems of high cost, metal residues, harsh reaction conditions and limited substrate applicability in the prior art are fundamentally solved.

The application discloses an antioxidant composite ceramic aerogel and a preparation method thereof, and belongs to the technical field of composite ceramic aerogels.The main body of the antioxidant composite ceramic aerogel is a silicon nitride aerogel, the nanostructure of the silicon nitride aerogel is one of one-dimensional silicon nitride nanowires and two-dimensional silicon nitride nanobands or a combination of the two nanostructures, and a mullite coating and a copper-nickel metal coating are sequentially coated on the nanostructure of the silicon nitride aerogel from inside to outside.The application can solve the technical problem that the prior art cannot prepare silicon nitride ceramic aerogels which can stably serve in a high-temperature oxygen environment at low cost and in batches.

The invention discloses a preparation method of an intermediate of macloxvir. The preparation method comprises the following steps: step 1, carrying out halogenation reaction; step 2, elimination reaction; step 3, addition reaction; step 4, ring closing reaction; the starting raw materials, the solvent and the catalyst selected in the invention are industrial-grade cheap and easily available products, have the advantage of low production raw material cost, and provide economic feasibility support for industrial large-scale production; reaction conditions of each step in the reaction process are mild, byproducts are few, the yield is high, and a target product can be prepared more efficiently; meanwhile, the synthesis route is high in atom utilization rate and excellent in atom economy, the used solvent and reagent are high in stability and easy to recycle and reuse, generation and emission of industrial three wastes are greatly reduced, the environment-friendly treatment cost is reduced, and the concept of green chemistry and sustainable development is met; the method gives consideration to economy, high efficiency and environmental friendliness, and solves the problems of low yield, violent reaction conditions and high cost of raw materials and auxiliary materials in the existing method.

The application provides a preparation method of 3,7-dinitro-1,3,5,7-tetraazabicyclononane, comprising the following steps: 1) feeding a first material comprising urea and concentrated sulfuric acid and a second material comprising fuming nitric acid and concentrated sulfuric acid into a microchannel reactor to perform a first-stage nitration reaction, to obtain a first-stage nitration reaction liquid; 2) feeding the first-stage nitration reaction liquid into a first tubular reactor to perform a second-stage nitration reaction, to obtain a second-stage nitration reaction liquid; 3) feeding the second-stage nitration reaction liquid and water into a second tubular reactor to perform a hydrolysis reaction, to obtain a hydrolysis liquid; 4) feeding the hydrolysis liquid and a third material comprising polyoxymethylene and ammonia water into a third tubular reactor to perform a condensation cyclization reaction, to obtain 3,7-dinitro-1,3,5,7-tetraazabicyclononane. The preparation method has the advantages of high safety, less waste pollution and simple operation.

The composite layer material (10) is made up of at least two laminated layers. One of outermost layers is a support film (2) that is removable from another layer and has a self-supporting property.

The application belongs to the technical field of biological medical materials, and discloses a polydopamine modified modified nano-graphyne and a preparation method and application thereof. In the method, the polydopamine coating is combined with the nano-graphyne for the first time to construct a GDY@PDA composite system, and the core defects of the blocky graphyne, such as easy agglomeration, poor water solubility and insufficient biocompatibility, are solved. The graphyne-based material is applied to the near-infrared two-region photothermal regulation of neural cell calcium influx for the first time, the calcium ion channel is activated through the local thermal effect of the material, and precise, remote and reversible calcium influx regulation is realized; the limitation that the traditional biocompatibility modification is easy to fall off and difficult to functionalize is broken through, the polydopamine modification makes the material have both photothermal efficiency and biological safety, and the application of the graphyne in the treatment of neural diseases (such as neural cell injury repair) is expanded.

The present invention addresses the problem of providing a method for efficiently producing a crystal of a compound A1, said method being suitable for industrial mass production, and enabling rapid crystallization in a crystallization step. As a solution, provided is a method for producing a crystal of a phenol compound having a methoxymethyl group represented by chemical formula (A1), the method being characterized by comprising a crystallization step, and a crystallization step in which crystals are precipitated from a solution containing a phenol compound having a methoxymethyl group represented by chemical formula (A1), a C3-4 chain aliphatic alcohol solvent, and a C6-8 aliphatic hydrocarbon solvent.

The application belongs to the technical field of polymer preparation, and particularly relates to a high-strength self-supporting polypyrrole nano array and a preparation method and application thereof. The preparation method comprises the following steps: (1) first, dispersing a hydroxypropyl-beta-cyclodextrin and polyethylene glycol aqueous solution onto an ice surface, and then adding a pyrrole monomer to form a dispersion liquid; (2) adding an acid solution containing an oxidizing agent to the dispersion liquid, and obtaining the high-strength self-supporting polypyrrole nano array after reaction. The application directly uses a macroscopic ice block as a hard template for polypyrrole preparation, and introduces a cyclic molecule hydroxypropyl-beta-cyclodextrin with hydrophilic and hydrophobic dual functions and polyethylene glycol with a linear polymer chain as an array growth aid, so that a high-strength polypyrrole nano sheet array with a self-supporting structure is prepared through a one-step polymerization method. The high-strength polypyrrole nano sheet array can be used as a conductive filler of polyurethane in the field of 3D printing technology, and greatly improves the mechanical properties and antistatic ability of products.

The invention relates to a titanium silicalite molecular sieve and a preparation method and application thereof, the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, carrying out first molding, and carrying out first roasting treatment on a solid product obtained by the first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; s4, carrying out secondary roasting treatment on the titanium silicalite molecular sieve pre-product; the mode of the first-time forming is extrusion forming. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has higher mechanical strength and larger specific surface area, and when the titanium silicalite molecular sieve is used for a reaction for preparing epoxypropane, higher epoxypropane selectivity and yield can be obtained.

This application discloses a method for preparing polylactic acid microporous injection foam material, including step S1: adding PBS matrix, nucleating agent, foaming agent, zinc oxide and PDMS into a mixer for mixing and pelletizing to obtain GAC; step S2: adding chain extender, crosslinking agent, antioxidant and white oil to LX530, mixing and stirring to obtain a mixture, and extruding the mixture to obtain PLAAU; step S3: mixing PLAAU and GAC for injection molding to prepare injection molded parts. This method can also improve the preparation efficiency and can more efficiently prepare polylactic acid injection molded products of different shapes and sizes that meet environmental protection requirements. Moreover, this method can use traditional injection molding machines to prepare polylactic acid foamed products, and has broad application prospects.

The application provides a continuous production method and system of calcium hydroxide with high whiteness and high specific surface area, and relates to the technical field of limestone deep processing. The continuous production method comprises the following steps: step one: continuously adding quicklime particles into the inlet of a primary digester, continuously adding digestion water and an additive into the inlet of the primary digester, and carrying out premixing and pre-digestion under stirring conditions; step two: continuously introducing the discharge of the primary digester into a secondary digester, continuously adding digestion water and an additive into the inlet of the secondary digester, and stirring and digesting and aging; step three: the discharge of the secondary digester is sequentially introduced into a tertiary digester, a quaternary digester and a quinary digester for digestion and aging, and the product is obtained after grading by a grader. The method can continuously prepare calcium hydroxide with high whiteness and high specific surface area, and has the characteristics of simple process, short time consumption, remarkable effect and low energy consumption, and has been applied in actual production and has good use effect.

The application discloses a preparation process of a high-performance Cu-Ni-Fe alloy based on first-principle calculation design, and relates to the technical field of alloy material preparation. The process constructs a precise Cu-Ni-Fe ternary alloy thermodynamic database by combining a first principle with a CALPHAD method, determines a composition range based on database calculation of a multivariate phase diagram, optimizes the composition by calculating a work function, an elastic constant and a thermal expansion coefficient through a first principle, and obtains a finished product through smelting, heat treatment and forming processing. The final alloy has an atomic percentage composition of Cu 30%-75%, Ni 10%-30% and Fe 10%-30%, a tensile strength of greater than or equal to 816.4 MPa, a total elongation at break of greater than or equal to 34.27%, and a thermal expansion coefficient of less than 20*10 ‑6 / K, and has excellent mechanical properties and thermal stability, thereby solving the problems of blind composition design and large performance fluctuation of a traditional process and being suitable for multiple fields such as ocean engineering and electronic packaging.

The present application relates to the technical field of energy storage equipment, and particularly relates to a porous carbon negative electrode material, a preparation method thereof and a secondary battery, the preparation method comprising the following process: starch is mixed with a template pore-forming agent, and a reaction is carried out under subcritical water conditions to obtain the porous carbon negative electrode material. The preparation method of the porous carbon negative electrode material provided by the present application utilizes subcritical water synthesis technology, simplifies the preparation process of the traditional porous carbon negative electrode material, is conducive to reducing energy consumption and cost, and realizes efficient preparation of the porous carbon material; the obtained porous carbon negative electrode material exhibits excellent electrochemical performance in the secondary battery, and has a wide application prospect.

The utility model relates to a single -arm type self -service sell coffee beverage machine's control structure belongs to coffee beverage vending machine technical field, including vending machine cabinet, vending machine cabinet front end is equipped with the meal outlet and the order screen, vending machine cabinet inside is equipped with the cup and cover falling ware located in vending machine cabinet one side, and the cup and cover falling ware are used for automatic provision cup and cover. Vending machine cabinet other side is equipped with the coffee machine, the coffee machine with the syrup machine between cup and cover falling ware, vending machine cabinet front end is equipped with the mechanical arm that takes the cup from cup and cover falling ware place and then stops syrup machine or coffee machine lastly will be equipped with coffee or beverage's cup and cover and send to the meal outlet. Have efficient convenient, space optimization, running stability is good and quality guarantee's characteristics. Realized efficient, accurate coffee and beverage production, simultaneously have good user interactive experience and running stability, be suitable for in commercial circle, office area etc. scene wide application.

The utility model belongs to the technical field of brushless motors, in particular to a plastic shell motor structure, which comprises a rotor, a stator and a plastic shell integrally formed by injection molding, the radial section of the plastic shell is W-shaped, and the plastic shell comprises an outer shell part and an isolation part which completely isolate the rotor from the stator. An opening for assembling the rotor and the stator is formed in one side, opposite to the isolation part, of the shell part; when the stator and the rotor are fixed by the plastic shell, the stator and the rotor are separated, due to the rigid design of the plastic shell, accurate positioning of the stator and the rotor can be ensured, uniform air gaps between the stator and the rotor are ensured, and vibration, noise and efficiency reduction caused by eccentricity are avoided; the plastic shell can enhance the insulation grade and can meet the double insulation design, and the power can be higher under the same condition; even if more enameled wires are wound on the stator to increase the power of the motor, the stator still meets the safety requirement of the electrical clearance, so that the motor can safely operate under higher power.

The utility model belongs to electrospinning technical field relates to a kind of Janus nanofiber electrospinning device, liquid storage module, including N liquid storage tank, for storing spinning solution;Wherein, N≥2;Spinning module, its top is provided with recess, recess is separately provided with multiple sharp copper bars in, for the recess is divided into N area, each area bottom is provided with the liquid supply passage through recess bottom and spinning module side wall;Liquid supply module, including N liquid supply pump, each liquid supply pump is connected one liquid storage tank and one liquid supply passage by conduit, for the spinning solution in N liquid storage tank is transmitted to the N area in recess by liquid supply passage;High voltage power supply, anode is connected with each sharp copper bar, cathode is connected with receiving module, for forming high voltage electric field between sharp copper bar and receiving module, so that the spinning solution in each area in recess generates jet at the top of sharp copper bar and forms nanofiber.

A manufacturing method for an electron source according to the present disclosure includes steps of: (A) cutting out a chip from a block of an electron emission material, (B) fixing a first end portion of the chip to a distal end of a support needle, and (C) sharpening a second end portion of the chip. The step (A) includes forming first and second grooves which constitute first and second surfaces of the chip in the block by irradiating a surface of the block with an ion beam. The first end portion of the chip includes the first surface and the second surface with the surfaces forming an angle α of 10 to 90°. The step (B) includes forming a joint between the distal end of the support needle and the first end portion of the chip.

The application discloses a kind of core-shell structure nanometer powder toughened zirconia ceramics and preparation method thereof, belong to ceramic material technical field, the method includes using three-dimensional network gel to realize washing-free co-precipitation method to prepare high-activity, ZrO2@SiO2Core-shell structure nanometer zirconia raw material powder, and stable agent is mixed ball milling, drying, sieving, shaping, cold isostatic pressing and gets green body, green body is placed in vacuum furnace and sintering, annealing and obtains toughened zirconia ceramic target product, realizes the efficient preparation of jade quality feeling simulation ceramic tooth of integral penetration.The application avoids the repeated washing steps of precursor in the traditional co-precipitation preparation process, reduces the introduction of impurities, the sintering temperature is lower, the powder yield is high, the process is simple, the cost is low, and is suitable for the industrial production of toughened zirconia ceramics.

The invention belongs to the technical field of electrochemistry and new energy, and particularly relates to a universal preparation method of MBene based on NH4HF2 protection-etching synergy and application of MBene in a lithium-sulfur battery. The preparation method comprises the following steps: mixing an MAB phase precursor and an NH4HF2 aqueous solution, and carrying out hydrothermal reaction to obtain MBene. Accurate etching of the Al layer in the MAB phase precursor and in-situ protection of the transition metal M layer can be effectively achieved, the method does not depend on a strong corrosive system and has universality, the prepared MBene serves as a positive electrode carrier and a diaphragm modification layer of a lithium-sulfur battery, the adsorption catalysis capacity on polysulfide can be remarkably enhanced, and the service life of the lithium-sulfur battery is prolonged. And the purpose of improving the rate capability and the cycling stability of the lithium-sulfur battery is achieved.

The invention discloses application of an acer palmatum 'Jinling Huangfeng' extract in preparation of a medicine for preventing and treating breast cancer, and belongs to the technical field of natural product extraction. The invention further discloses an extraction method of the acer palmatum 'Jinling Huangfeng' extract and a separation method of active ingredients of the acer palmatum 'Jinling Huangfeng' extract. Scratch repair experiments directly prove that the acer palmatum 'Jinling Huangfeng' extract can significantly inhibit the migration ability of highly metastatic breast cancer cells MDA-MB-231. The separation method of the active components of the acer palmatum 'Jinling Huangfeng' extract is closely linked with anti-breast cancer metastasis activity screening, so that the experimental process has definite pharmacological guidance quality, the efficiency and success rate of finding the active components are greatly improved, and a high-value candidate resource is provided for developing anti-metastasis drugs.