39results about How to "Improve diffusion efficiency" patented technology

The invention relates to the technical field of oxygen reduction catalysts, in particular to a transition metal-based triatomic oxygen reduction catalyst and a preparation method and application thereof. The invention relates to a preparation method of a transition metal-based triatomic oxygen reduction catalyst. The preparation method comprises the following steps: dispersing carbon nanotubes in a solvent to obtain a dispersion liquid; adding transition metal acetate, urea and 4, 4 '-dihydroxy [1, 1'-biphenyl]-3, 3 ', 5, 5'-tetracarboxaldehyde into the dispersion liquid, performing ultrasonic treatment to obtain mixed liquid, and then performing heating reaction in an inert atmosphere; and after the reaction is finished, naturally cooling to room temperature, filtering, washing and drying to obtain the transition metal-based triatomic oxygen reduction catalyst. The catalyst designed by the invention not only has an efficient catalytic active site, but also remarkably improves the material transmission efficiency and enhances the utilization rate of a catalytic active center by optimizing the structure of a composite material, so that the synergistic enhancement of the electro-catalytic performance is realized.

The application belongs to the technical field of carbonyl sulfur hydrolysis catalysts, and discloses a high-efficiency sulfur-resistant catalyst for carbonyl sulfur hydrolysis, a preparation method and application thereof.The preparation method comprises the following steps: (1) preparing a porous ceramic carrier containing alumina, titanium dioxide and zirconium dioxide; (2) in-situ growing a metal organic framework material containing lanthanum, bismuth and cerium on the surface of the porous ceramic carrier by using a solvothermal method; (3) performing a calcination treatment on the porous ceramic carrier loaded with the metal organic framework material in an oxygen-containing atmosphere to obtain a catalyst precursor; and (4) performing a reducing gas plasma bombardment treatment on the catalyst precursor to obtain the high-efficiency sulfur-resistant catalyst.The high-efficiency sulfur-resistant catalyst has high-efficiency low-temperature activity, excellent sulfur resistance and long service life.

The invention provides a preparation method of a high-performance grain boundary diffusion sintered neodymium iron boron material, and belongs to the technical field of permanent magnet materials. The low-melting-point heavy-rare-earth-free alloy coating is coated and cured on the easy-to-diffuse surface of the neodymium-iron-boron base material magnet, and the heavy-rare-earth alloy coating is coated and cured on the low-melting-point heavy-rare-earth-free alloy coating; and the coated magnet is sequentially subjected to low-temperature pre-diffusion heat treatment, grain boundary diffusion heat treatment and aging treatment, and then the grain boundary diffusion neodymium-iron-boron magnet is obtained. According to the invention, the diffusion efficiency of heavy rare earth elements can be effectively improved, the coercive force of the magnet is improved, and relatively high residual magnetism can be achieved.

The utility model discloses a Mylar film structure for aluminum shell battery, aluminum shell battery and electronic product belong to battery technical field, including Mylar film body, Mylar film body includes first cladding piece, second cladding piece and the connecting cladding piece of first cladding piece and second cladding piece are connected respectively, recesses is formed in first cladding piece and is used to store the first liquid storage groove of electrolyte, recesses is formed in second cladding piece and is used to store the second liquid storage groove of electrolyte, first liquid storage groove and second liquid storage groove all are located on the side surface of battery roll core. The utility model reaches the technical effect of improving diffusion efficiency, and promotes the long -term cycle performance of battery.

The application provides a positive electrode active material, a preparation method of the positive electrode active material and a potassium ion battery, and relates to the field of secondary batteries. The positive electrode active material comprises a core and a carbon layer covering the core, and the chemical formula of the core is K 3+x V 3‑x Ni x (PO4)4, 0.05<=x<=0.5. In the application, Ni 2+ is doped in the KVP material, so that the structural stability and the electrochemical performance of the positive electrode active material are effectively improved. Specifically, by doping Ni 2+ , the product purity and the crystalline integrity of the positive electrode active material are significantly improved, the structural stability of the product is enhanced, and the problems of low product purity and many impurities in the existing preparation method are solved. Moreover, the reaction kinetics and the cycle performance of the positive electrode active material are synergistically optimized.

The utility model discloses a fogging disinfection device for central air conditioning, including air duct, air duct bottom is equipped with air duct flange, air duct below is equipped with solution tank, the top of solution tank is equipped with the solution tank flange of air duct flange adaptation, air duct inside is equipped with the two piece microporous ceramic atomizing piece of inclination setting, the surface of microporous ceramic atomizing piece is equipped with annular piezoelectric driver, the cavity is formed between microporous ceramic atomizing piece, the inside of cavity is equipped with atomizing nozzle, the atomizing nozzle is extended to the inside of solution tank through hose, the utility model discloses through secondary atomization processing, and the disinfectant spreads along the direction of air current, plays good atomization efficiency processing effect, and the effect of atomization diffusion is effectively improved with the air direction and the inclination direction of microporous ceramic atomizing piece, and the efficiency of diffusion is improved.

This invention discloses the application of an electrode material for reducing intracellular resistance genes in drug-resistant bacteria. A platinum-doped dendritic TiO2 nanowire structure based on a three-dimensional material is formed by growing a micron-sized TiO2 backbone array and platinum-doped nano-sized TiO2 branches on the surface of a porous electrode. The prepared dendritic nanowire three-dimensional electrode material has a larger specific surface area, providing more reactive sites and strong electric field sites. Platinum doping enhances the conductivity and electrocatalytic performance of the nanowires. Furthermore, by combining it with chloride salts / oxidants, the electroporation and electrocatalysis of the nanowire electrode surface are coupled. The strong electric field confined at the nanowire tip induces perforation of the drug-resistant bacterial cell structure, strengthening the contact and reaction between the oxidant and the resistance gene. The high electrocatalytic activity confined at the nanowire tip induces the generation of strong oxidizing free radicals, achieving the goal of destroying the drug-resistant bacterial cell structure and efficiently reducing intracellular resistance genes.

The application discloses a preparation method of nanosheet TS-1 molecular sieve and application thereof, relates to the technical field of catalysts, and synthesizes the TS-1 molecular sieve through a double quaternary ammonium salt structure directing agent containing a benzene ring; the obtained TS-1 molecular sieve has rich surface active sites and contains almost no impurities such as non-framework titanium and anatase TiO2; meanwhile, the nanosheet morphology significantly improves the diffusion and mass transfer performance of macromolecular reactants in a catalytic process, effectively enhances the accessibility of active sites; in a cyclohexene epoxidation reaction, the molecular sieve exhibits excellent catalytic performance and shows good application prospect; and the problems of significant channel diffusion limitation and low accessibility of active sites of the TS-1 molecular sieve in a catalytic process are solved.

The application discloses a kind of perovskite laminated solar cell and preparation method thereof, photovoltaic module and photovoltaic device, belong to solar cell technical field.The perovskite laminated solar cell from light-receiving front to light-receiving back successively includes substrate, bottom electrode, first hole transport layer, wide band gap perovskite layer, first electron transport layer, barrier layer, intermediate interconnection layer, narrow band gap perovskite layer, second electron transport layer, hole blocking layer, top electrode;The intermediate interconnection layer includes first sublayer, self-assembled monolayer and second sublayer, first sublayer faces first electron transport layer, second sublayer faces narrow band gap perovskite layer, and self-assembled monolayer is located between first sublayer and second sublayer.The application can inhibit interface scattering and reduce wide-angle reflection loss under oblique incidence, while maintaining excellent electrical transmission to promote carrier transfer and recombination, significantly improve the overall photovoltaic performance of device.

This invention relates to the field of titanium alloy chemical heat treatment technology, specifically to a method for preparing a nitrided layer in titanium alloy using ion implantation-assisted plasma nitriding and its application. First, the titanium alloy is polished. Then, different dosages of Ti-La elements are implanted into the surface of the titanium alloy using ion implantation technology. Finally, the implanted titanium alloy is subjected to plasma nitriding. The purpose of this invention is to pre-introduce vacancies, dislocations, and other crystal defects on the surface of the titanium alloy using high-energy ion implantation technology, increasing the nitrogen diffusion channels during the nitriding process and improving nitriding efficiency. Under the same nitriding conditions, a thicker nitrided layer can be achieved. Simultaneously, the extremely fine nitride nucleation formed on the surface under the catalysis of La results in a denser surface, achieving higher surface hardness under the same conditions. This helps improve the mechanical, tribological, and fatigue properties of titanium alloys, and can be applied in aerospace, biomedical devices, and marine equipment fields.

The invention discloses a preparation method of a catalyst for preparing acetaldehyde from ethanol, and belongs to the technical field of chemical synthesis, and the method comprises the following steps: dissolving a metal salt in deionized water, adding a silicon source and a template agent, adjusting the pH value, atomizing the solution, and carrying out aerosol spray drying to form a catalyst precursor; immersing the precursor into a dopamine-Tris buffer solution, and performing in-situ polymerization to form a polydopamine shell layer; and performing high-temperature carbonization and hydrogen reduction to obtain the catalyst. The method comprises the following steps: adding a catalyst into a reaction tube, fixing in a fixed bed reactor, preheating ethanol, introducing into the fixed bed reactor, reacting on the surface of the catalyst to generate acetaldehyde and hydrogen, condensing and separating acetaldehyde, and collecting hydrogen through a gas device arranged at the outlet of the reactor. According to the invention, the problems of low acetaldehyde selectivity, easy sintering deactivation of the catalyst and the like in the prior art are solved, the acetaldehyde selectivity is effectively improved, and the service life of the catalyst is prolonged.

The invention relates to the cross technical field of sodium-ion batteries and glass preparation, in particular to a sodium-ion battery negative electrode material and a preparation method thereof, and the sodium-ion battery negative electrode material comprises a current collector and a composite active coating attached to the current collector; the composite active coating is formed by coating and drying slurry, and the slurry comprises a glass material, a conductive material and a binder. According to the invention, the glass material is introduced into the composite active coating, so that the structural stress in the sodion deintercalation process is effectively buffered, and the phase change and structural collapse of the electrode material are inhibited, thereby remarkably improving the cycling stability; meanwhile, the ion diffusion rate and the electron conduction efficiency are enhanced and the rate capability and the capacity performance are improved by a three-dimensional conductive network formed by the glass material, the conductive material and the binder in a synergistic manner, the overall preparation process is simple, the cost is relatively low, and a feasible material solution is provided for high-performance application of the sodium-ion battery in the field of large-scale energy storage.

This invention discloses a grinding wheel and a silicon carbide electrochemical nanogrinding method using the same. The grinding wheel includes a grinding wheel ring, grinding wheel blocks, and an ultrasonic vibration module; multiple grinding wheel blocks are arranged at intervals at the bottom of the grinding wheel ring, and the ultrasonic vibration module is installed at the top of the grinding wheel ring; each grinding wheel block includes a core and an outer layer surrounding the core; the core has a porous structure; the outer layer is made of composite abrasive particles, active metal, carbon fiber, and a conductive binder, and the composite abrasive particles, active metal, and carbon fiber are embedded within a conductive matrix formed by the conductive binder. The grinding wheel proposed in this invention can effectively enhance the grinding force and grinding ratio of the grinding wheel, thereby significantly improving the grinding efficiency when used for electrochemical nanogrinding; on the other hand, it can significantly reduce the wear and damage of the grinding wheel during electrochemical nanogrinding, thus extending the service life of the grinding wheel.

The invention relates to the technical field of carbon dioxide capture and adsorption, in particular to a calcium oxide-based adsorbent for high-temperature carbon dioxide capture and a preparation method. The adsorbent comprises a biomass calcium carbonate matrix, a skeleton proppant, a Ce-Zr-Cu composite oxide bifunctional aid, a conductive dispersant, a macropore-mesopore-micropore hierarchical porous structure formed by biomimetic mineralization of a biological template agent, and an amino functional group grafted by a surface modifier. The biomass calcium carbonate matrix is formed by compounding egg shells, shells and coral bones according to the mass ratio of 1: 1: 0.5; the skeleton proppant is formed by compounding a ZSM-5 molecular sieve and mesoporous gamma-aluminum oxide according to a mass ratio of 2: 1; in the scheme, biomimetic mineralization is realized by compounding a ZSM-5 / gamma-alumina skeleton and a Ce-Zr-Cu ternary auxiliary agent, introducing a PAN-based nitrogen-doped carbon network and matching with a diatom-egg white biological template, and APTES + PEI surface modification is performed, so that the problems of poor sintering, poor circulation, agglomeration and the like of a traditional adsorbent are solved in a targeted manner, double-temperature-zone adsorption is also realized, and the comprehensive performance is greatly improved.

The utility model provides insect trapping and killing equipment for rice diseases and insect pests. Comprising a supporting rod and a connecting block, a lamp cylinder is installed on the connecting block, a top plate is installed on the lamp cylinder, a lifting cover is arranged in the top plate, a medicine containing box is installed below the lifting cover, a connecting cylinder is installed below the lamp cylinder, and a draught fan is installed in the connecting cylinder. According to the LED lamp tube, pests can be attracted through the light source and the pheromones at the same time, heat can be released in the working process of the lamp tube, the diffusion range and efficiency of the pheromones can be improved in cooperation with the draught fan due to the fact that movement between molecules is quickened along with temperature rising, and the pest attracting effect can be effectively improved; pests can be killed under the action of current after making contact with the electric net cover, meanwhile, the surface of the electric net cover is effectively cleaned through an insulation brush driven by a motor, residual of pest bodies is avoided, and the high practicability and the high pest killing effect are achieved.

The invention discloses a D-A type covalent organic framework material as well as a preparation method and application of the D-A type covalent organic framework material. The material is obtained through aldehyde amine condensation by using N, N ', N'-tetra (p-aminophenyl) p-phenylenediamine (TAPB) as a donor unit and 3, 6-bis (5-aldehyde thiophene-2-yl)-2, 5-bis (2-ethylhexyl) pyrrolo [3, 4-c] pyrrolo [3, 4-c] pyrrole-4 (2H, 5H)-diketone (DSZ) as an acceptor unit, and the material is of a two-dimensional layered porous structure, is dark blue and has reversible switching electrochromic performance from dark blue to nearly transparent color. According to the invention, a donor-receptor type covalent organic framework structure is constructed through TAPB and DSZ, and reversible color change from dark blue to nearly colorless in a near-infrared region is realized by using synergistic oxidation reduction of a D-A unit and charge transfer characteristics of a conjugated framework.

The invention provides a platinum-bismuth alloy catalyst, a preparation method thereof and a direct methanol fuel cell, and belongs to the technical field of electrochemical catalysts. The method comprises the following steps: mixing carbon black with an acidic aqueous solution, and sequentially carrying out acidizing treatment and roasting treatment to obtain pretreated carbon black; mixing the pretreated carbon black, Bi2O2CO3, a platinum source, a precipitant, a pH regulator, a first dispersing agent and first water, and performing replacement reaction to obtain a suspension; mixing a reducing agent, a second dispersing agent and second water to obtain a mixed solution; dropwise adding the suspension into the mixed solution for reduction reaction to obtain a catalyst precursor; and calcining the catalyst precursor under first protective gas to obtain the platinum-bismuth alloy catalyst. The prepared platinum-bismuth alloy catalyst has excellent electro-catalytic performance, shows relatively high catalytic activity and cycling stability, and can be applied to oxygen reduction reaction of a cathode of a direct methanol fuel cell.

The present application relates to a new type of negative electrode material for lithium ion batteries, and particularly relates to a boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material and a preparation method thereof. The boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material is prepared by mixing a resin with a template agent, doping a boron source, adding a spheroidizing agent and an initiator for spheroidization polymerization, removing impurities and drying, and then performing gas-phase etching to form pores. Silicon is deposited in the pores of the porous carbon and a carbon layer is deposited on the surface of the silicon-carbon precursor by twice chemical vapor deposition, so as to obtain the boron-doped porous carbon gas-phase silicon-carbon composite negative electrode material. The boron element is doped to optimize the electronic conductivity, the spheroidized porous carbon structure is improved to improve the lithium ion transmission channel and enhance the substrate stiffness, and the material has excellent performance of high rate, low expansion and long cycle, so as to solve the problems of insufficient rate performance, low substrate strength and blocked lithium ion transmission of the existing gas-phase silicon-carbon composite negative electrode material in the prior art.

The application belongs to the technical field of new energy materials, and particularly relates to a secondary battery and an electric device. Compared with the prior art, the application can improve the energy density of the battery, and improve the first coulomb efficiency and the cycle performance by selecting the first active material and the second active material with a specific composition, and cooperating with the settings of the first coating and the second coating. Specifically, the energy density can be improved by using a soft carbon hard carbon composite material in combination with a graphite coated hard carbon material; the conductivity of the negative electrode sheet can be improved, the ion diffusion dynamics can be improved, and the sodium ion deintercalation can be facilitated by doping the active material with the first element and the second element; and the ion diffusion efficiency can be improved, the sodium ion deintercalation can be accelerated, the first coulomb efficiency can be improved, and the battery cycle performance can be improved by using the settings of the double active material coating.

The utility model discloses a dustproof pipeline facilitating ventilation, and belongs to the technical field of dustproof pipelines. Comprising a main air pipe and a Y-shaped pipe, the Y-shaped pipe is installed on the outer wall of the main air pipe, a supporting seat is installed at the top end of the Y-shaped pipe, flow dividing pipes are symmetrically installed on the outer wall of the Y-shaped pipe, air outlet covers are installed on the outer walls of the flow dividing pipes, and an axial flow fan is installed in the main air pipe; and a servo motor is mounted on the outer wall of each Y-shaped pipe on one side. According to the dust-proof pipeline, convenient and fast diversion ventilation of the dust-proof pipeline is achieved, convenient and fast filtering of dust and impurities by the dust-proof pipeline is achieved, the convenience of replacing a filter screen by opening a cover is improved, two-group type mutual switching ventilation of the dust-proof pipeline is facilitated, and the other group is convenient to maintain without shutdown after one group is damaged; in addition, the dustproof pipeline can conveniently and rapidly swing in a reciprocating mode to guide air out, and the gas diffusion efficiency is improved.

The application relates to the technical field of mixing, in particular to a multi-raw-material precise proportioning and mixing device suitable for DTBP micro-reaction, which comprises a plate-type reactor, a raw material supply unit, a proportioning and mixing unit and a linkage adjusting mechanism. The raw material supply unit comprises methyl ethyl ketone feeding pipes and hydrogen peroxide feeding pipes for respectively feeding methyl ethyl ketone and hydrogen peroxide, a DMP feeding pipe for feeding DMP and a sodium sulfate feeding pipe for feeding sodium sulfate. The proportioning and mixing unit comprises a first mixer, a second mixer, a third mixer and a mixing flow guide shell arranged in the three mixers. Two mixing pipes are arranged at the upstream of the mixing flow guide shell. The linkage adjusting mechanism comprises an adjusting assembly arranged at the upstream of the mixing flow guide shell, an electromagnet push rod for controlling the adjusting assembly and a flow channel switching assembly linked with the adjusting assembly. The flow channel switching assembly comprises a movable connecting seat which can be driven to move by the electromagnet push rod, and the movement of the movable connecting seat can synchronously change the guiding state of the fluid after passing through the adjusting assembly.

The application belongs to the technical field of hazardous waste pollution control, and discloses a synergistic penetration stable-effect fly ash selenium-fixing composite chelating agent and application thereof. The chelating agent is composed of the following components in percentage by mass: piperazine compound 10-30%, ferrous sulfate 15-35%, penetrating agent 3-12%, and borax-sodium hydroxide buffer 40-70%. In preparation, ferrous sulfate is dissolved in the buffer at room temperature, then the piperazine compound is added and stirred, and finally the penetrating agent is added, heated to 40-50 DEG C, and stirred for preservation, to obtain a red-brown transparent liquid with pH 9.5-11.5. The application realizes efficient and stable fixation of various forms of selenium in fly ash through the multi-mechanism synergy of penetrating agent reinforced diffusion of the medicament in fly ash micropores, a stable alkaline environment maintained by the buffer system, and Fe 2+ reduction precipitation and piperazine chelation adsorption, and the selenium leaching concentration of the treated fly ash is ≤0.1 mg / L, meeting the standard and having long-term stability.

The application discloses a preparation method of a lithium nickel cobalt manganese oxide ternary positive electrode material and belongs to the technical field of lithium ion batteries. The lithium nickel cobalt manganese oxide ternary positive electrode material is prepared by the following steps: synthesizing Y-containing nickel cobalt manganese hydroxide by adopting a co-precipitation method, then doping N and synthesizing the lithium nickel cobalt manganese oxide material by adopting a high-temperature solidification sintering method, and then coating N-containing yttrium titanate (N-YTO) on the surface of the lithium nickel cobalt manganese oxide material by adopting a sol-gel method. The preparation process is simple and easy to operate, Y and N are uniformly doped in the bulk phase, the N-YTO coating layer is uniformly distributed on the surface of the material, the N-YTO coating layer can effectively inhibit the occurrence of internal micro-cracks of particles, electrolyte corrosion and side reactions, can improve the diffusion efficiency of lithium ions and the structural stability, and can further improve the voltage platform, the cycle life, the rate performance and the thermal safety of the lithium nickel cobalt manganese oxide ternary positive electrode material, and the lithium nickel cobalt manganese oxide ternary positive electrode material is suitable for large-scale production.

The application discloses a preparation method of lithium ion adsorption material and application thereof, and belongs to the technical field of lithium ion adsorption material. The method comprises the following steps: dissolving a spinning polymer in a solvent, adding nano lithium adsorbent powder, performing electrostatic spinning on the obtained spinning suspension liquid, placing the obtained fiber felt in water to perform homogenization, obtaining a nano short fiber dispersion liquid, adding an anionic surfactant to the nano short fiber dispersion liquid, stirring and foaming, adding a cationic polyacrylamide solution to perform flocculation after the foaming is completed, drying the obtained wet foam to obtain a fiber-based solid foam, immersing the fiber-based solid foam in a reinforcing liquid, and then performing filtration and heating drying, so as to obtain the lithium ion adsorption material.

The utility model relates to the technical field of seedling raising frames, and discloses a seedling raising frame for agricultural technology popularization, which comprises two groups of supporting main rods, and universal wheels are fixedly mounted at the bottom ends of the two groups of supporting main rods; the two sides of the seedling trays are jointly and movably connected with a first connecting rod; the inclination adjusting assembly comprises a clamping plate and a pile plate; and the reinforcing assembly comprises a rectangular box and a rectangular plate. The reinforcing assemblies are arranged on the outer sides of the supporting main rods, the reinforcing columns at the bottom ends of the rectangular plates descend to the ground through descending of the lifting rods, the reinforcing columns on the two sides play a role in supporting the supporting main rods, the stability of the seedling raising frame is improved, and the situation that the seedling raising frame is in an inclined state after seedling trays are placed is avoided; by arranging the inclination adjusting assembly, the inclination angles of the multiple seedling trays can be adjusted, shielding of upper-layer leaves on the lower layer is reduced, and photosynthesis uniformity is improved.

The invention provides a ZSM-23 molecular sieve, a preparation method thereof and a catalyst. The preparation method comprises the following steps: mixing a silicon source, an aluminum source, an alkali source, an organic structure-directing agent, a mesoporous template agent, a crystal growth inhibitor and water to form a raw material solution, crystallizing, washing, drying and roasting to obtain the ZSM-23 molecular sieve, the crystal growth inhibitor comprises one or a combination of more than two of trimethoxy [3-(phenylamino) propyl] silane, lauryl sodium sulfate, tetradecyl phosphoric acid and glutamic acid. According to the method, the ZSM-23 molecular sieve with small crystal grains and a hierarchical pore structure can be synthesized in one step, and the catalytic performance of the molecular sieve is improved.

The utility model belongs to aromatherapy machine technical field, a kind of water heating blanket knob with fragrance, including shell, upper cover and iris mechanism, after user drops in essential oil, by magnet piece and magnet attraction realization iris mechanism and inner chamber top surface abut, at this time, rotate upper cover, to realize the adjustment of incense concentration, realize the independent adjustment of indoor fragrance concentration, so that device can adapt to different scene needs, and then so that device adaptability is higher, user can also be through the way of screw column rotation to go up and down telescopic fixed column, user can adjust fixed column height according to the size, thickness of fragrance stone, ensure that fragrance stone is stably placed, can adapt to different specifications of fragrance stone, increase the versatility and adaptability of product, in the utility model, inner chamber bottom surface is provided with honeycomb heat-conducting sheet, honeycomb heat-conducting sheet can more effectively guide and evenly distribute the heat from host controller to fragrance stone, accelerate the volatilization and diffusion efficiency of fragrance liquid.

This invention provides a method for producing lubricating oil base oil from heavy feedstock and the resulting lubricating oil base oil. The method includes: cutting the heavy feedstock to obtain a light component, a middle fraction, and a bottom wax; wherein the boiling point ranges of the light component, the middle fraction, and the bottom wax are 170-300℃, 300-500℃, and >500℃, respectively; subjecting the bottom wax to a first isomerization reaction under the catalysis of a first isomerization catalyst to obtain a first isomerization product; subjecting the first isomerization product and the middle fraction to a second isomerization reaction under the catalysis of a second isomerization catalyst to obtain a second isomerization product; subjecting the second isomerization product to hydrorefining; and then fractionating the obtained refined product to obtain the lubricating oil base oil. The lubricating oil base oil produced by this method has high yield, low pour point, low cloud point, and high viscosity index, making it a high-quality lubricating oil base oil.

The application relates to the technical field of quantum image encryption and discloses a quantum image encryption method based on two-dimensional cross mapping and dynamic diffusion, which is used for solving the problems of small key space, high complexity of image processing algorithm and time-consuming calculation in the prior art image encryption method. The quantum image encryption and decryption method based on two-dimensional cross chaotic mapping and dynamic diffusion generates a chaos sequence related to a plaintext by a two-dimensional cross chaotic system 2D-LAS, converts a classical image into a quantum image by using an NEQR model, performs a bit-level operation on pixel values of the quantum image by using dynamic diffusion, wherein the bit-level operation includes a bit-level shift operation, a bit-level cross XOR shift operation and a bit-level cyclic shift operation, the shuffling process is to cyclically shift the image between rows and columns, and after the shuffling is completed, the image is iteratively XORed, and the pixel is subjected to a diffusion operation, so that the diffusion efficiency is improved.

The application relates to the technical field of battery positive electrode materials, in particular to a synergistically modified high-voltage positive electrode material and a preparation method and application thereof, which comprises a bulk particle, a doped layer coated on the surface of the bulk particle and a coating layer coated on the surface of the doped layer; the bulk particle comprises lithium nickel cobalt manganese oxide; the doped layer is lithium nickel cobalt manganese oxide doped with fluorine elements in a bulk phase; and the coating layer comprises a lithium fluoride coating layer and lithium nickel cobalt manganese titanium oxide particles embedded in the lithium fluoride coating layer. The preparation method comprises the following steps: firstly, a nickel cobalt manganese hydroxide precursor is prepared by adopting a coprecipitation method; then, a doped layer and a coating layer are synthesized on the surface of the nickel cobalt manganese hydroxide precursor by adopting a solvothermal method; finally, calcination treatment is carried out to obtain the synergistically modified high-voltage positive electrode material. The synergistic modification strategy of bulk phase doping and surface coating effectively guarantees the stability of the interface and bulk structure, the preparation process is simple, and the electrochemical performance of the positive electrode material under high voltage, high cycle, high rate or high-temperature environment is improved.