10096results about How to "Improve binding" patented technology

The invention provides a nano enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: adding a stabilizer into a preheated solvent, and carrying out ultrasonic treatment; then adding ferric salt and cobalt salt, and adding alkali to adjust the pH value of the solution; then transferring the solution into a reaction kettle for reaction; and after the reaction, washing and separating to obtain the product. The obtained nano-enzyme is appropriate and uniform in particle size and good in dispersity, the enzyme activity is as high as 9.56 U / mg, and the application of the nano-enzyme in immunochromatography detection and plant canker prevention and treatment is widened. When the immunochromatography detection card prepared from the nano enzyme is used for detecting human hemoglobin, the detection limit can reach 0.05 ng / mL and is at least 10 times lower than that of a commercially available kit. When the nano-enzyme suspension is used for preventing and treating the kiwifruit canker, the nano-enzyme suspension with the concentration larger than or equal to 0.1 mg / mL is used, and the plant canker can be well controlled.

The invention relates to the technical field of nano ceramic materials, and discloses a high-strength nano aluminum oxide ceramic product and a preparation process thereof.The preparation process comprises the following preparation steps that aluminum oxide powder, a composite binder, composite gel, a plasticizer and a solvent are mixed and subjected to ball milling, and composite slurry is obtained; placing the composite slurry in a mold, and performing mold pressing and drying to obtain a green body; and putting the green body into a high-temperature sintering furnace, carrying out high-temperature sintering, and cooling to room temperature to obtain the nano aluminum oxide ceramic product. Nano zirconium oxide and nano magnesium oxide are formed on the surfaces of the pretreated silicon carbide whiskers, and can form a solid solution with nano aluminum oxide in the sintering process to serve as a bridge of the silicon carbide whiskers and nano aluminum oxide particles, so that the binding force of the silicon carbide whiskers in a nano aluminum oxide ceramic matrix is remarkably enhanced; phosphoric acid and aluminum ammonium sulfate are firmly combined on the surfaces of nanometer aluminum oxide particles through carboxymethyl cellulose, and the situation that phosphoric acid and aluminum ammonium sulfate are not firmly combined with the nanometer aluminum oxide particles is avoided.

The invention discloses a shear capacity analysis method for a reinforced concrete beam with stirrups based on machine learning, and the method comprises the steps: constructing a training set and a test set based on a shear capacity database of the beam with stirrups; establishing an interpretable prediction model by utilizing machine learning, setting hyper-parameters for the interpretable prediction model, and performing training; obtaining a shear bearing capacity prediction value of the samples in the test set by using the trained prediction model; and quantifying the contribution of each key anti-shearing characteristic to the anti-shearing bearing capacity predicted value, and analyzing and judging the reasonability of the anti-shearing bearing capacity predicted value output by the prediction model according to the anti-shearing theory. According to the method, the problems of high prediction difficulty, high discreteness, lack of reliable physical models, large calculation amount of high-precision numerical simulation and the like in machine learning are solved for the first time; the prediction model can accurately reflect the complex nonlinear relation between the shear bearing capacity and the influence factors, and meanwhile, the model reasonability is verified and improved in combination with a prediction result and priori knowledge, so that the man-machine interaction trust in practical application is improved.

The invention belongs to the technical field of polymer plastic materials, and particularly relates to a high-temperature-resistant anti-corrosion polytetrafluoroethylene material and a preparation method thereof. The polytetrafluoroethylene is prepared from the following raw materials in parts by weight: 50 to 60 parts of polytetrafluoroethylene, 5 to 10 parts of fluorinated modified graphene oxide, 3 to 5 parts of aluminum powder, 5 to 8 parts of modified silicon carbide fiber, 3 to 5 parts of silane modified nano silicon dioxide, 2 to 3 parts of polyphenylene sulfide, 2 to 3 parts of polyimide, 0.5 to 0.8 part of dispersing agent and 0.5 to 1 part of antioxidant. The heat conduction performance and the interface bonding force are improved through the fluorinated modified graphene oxide, the impact resistance and the wear resistance are enhanced through the silicon carbide fibers, and the corrosion resistance and the wear resistance are improved through the aluminum powder; silane modified silicon dioxide enhances the mechanical property of the composite material by improving the dispersity of the filler, and PPS and PI interact with the surface of the filler through polar groups in molecular chains, so that the interface strength is improved, and the toughness and the thermal stability are improved.

The invention belongs to the technical field of soft magnetic materials, and discloses an amorphous nanocrystalline soft magnetic material with high saturation flux density and a preparation method thereof. The preparation method comprises the following steps that an iron-based amorphous strip is crushed into flat powder with the thickness being 5-25 microns and the diameter being 30-80 microns, and scaly amorphous soft magnetic powder is obtained; the method comprises the following steps: performing insulation coating treatment on spherical iron-silicon soft magnetic powder with the average particle size of 2-20 microns to obtain insulation coating modified spherical magnetic powder; and mixing the obtained scaly amorphous soft magnetic powder, the insulating coated modified spherical magnetic powder and bonding resin, performing compression molding, performing annealing crystallization treatment at the temperature of 450-550 DEG C, and then raising the temperature to 600-900 DEG C for sintering treatment to obtain a finished product. According to the amorphous nanocrystalline soft magnetic material and the preparation method thereof, the spherical iron-silicon soft magnetic powder modified through insulation coating is compounded with the scaly amorphous soft magnetic powder, and low loss is maintained while the obtained amorphous nanocrystalline soft magnetic material Bs is remarkably improved.

The invention relates to the technical field of electronic ceramic materials, and particularly discloses a high-purity aluminum oxide ceramic substrate and a preparation process thereof. The high-purity aluminum oxide ceramic substrate is prepared from the following raw materials in parts by weight: 0.20 to 0.25 part of magnesium oxide, 0.35 to 0.55 part of zirconium oxide, 1.2 to 1.5 parts of dispersing agent, 60 to 65 parts of ethanol, 99.7 to 99.8 parts of aluminum oxide, 12 to 15 parts of adhesive, 6 to 9 parts of plasticizer and 50 to 55 parts of n-butyl alcohol, the adhesive is a mixture of polyvinyl butyral, water glass and modified paraffin. The prepared high-purity aluminum oxide ceramic substrate has excellent chemical stability and mechanical strength, and the obtained aluminum oxide ceramic substrate has better density, mechanical property and thermal stability by mixing various raw material components, and is not easy to break when subjected to bending load.

The invention relates to a pitch carbon fiber reinforced resin-based composite material and a preparation method thereof. Pitch carbon fibers are subjected to electrochemical surface treatment in an acidic electrolyte and then treated with a silane coupling agent; blending and dispersing a polyfunctional epoxy resin matrix, inorganic nano heat-conducting particles treated by a silane coupling agent, a high-temperature curing agent and an organic solvent to obtain an epoxy resin matrix solution; winding the pitch carbon fiber and the epoxy resin matrix solution to prepare a prepreg, drying, cutting, paving, and hot-pressing and curing to obtain the high-compression high-thermal-conductivity pitch carbon fiber reinforced resin matrix composite material. The composite material has the unidirectional compression strength of 305-420MPa and the unidirectional thermal conductivity of 295-618W / (m.K), has excellent compression performance and thermal conductivity, can be used for preparing aerospace craft structures / functional parts, and can also meet the requirements of other industrial equipment fields on light-weight, high-strength, high-modulus and high-thermal-conductivity composite materials.

The invention relates to a multi-layer nickel net catalytic electrode for hydrogen production by alkaline electrolysis of water and a preparation method of the multi-layer nickel net catalytic electrode. The multi-layer catalytic electrode comprises multiple layers of nickel nets with different mesh numbers, and the multiple layers of nickel nets are sequentially stacked according to the mesh numbers from large to small and are sintered and formed to form the multi-layer nickel net catalytic electrode with the dense inside and the sparse outside. The preparation method comprises the following steps: sequentially stacking nickel nets with different mesh numbers according to the mesh number from large to small, and sintering; and then a raw material belt is flatly laid on the outer surface of the first layer of nickel net, stamping and electro-deposition are carried out, polishing is carried out after electro-deposition, rapid sintering is carried out, and the multi-layer catalytic electrode is obtained. Compared with the prior art, the catalytic electrode disclosed by the invention is of a structure with three layers of nickel nets which are dense inside and sparse outside, and the three layers of nickel nets are slightly melted and adhered together at high temperature to form an integral structure by adopting a vacuum sintering process, so that not only is the binding force among the nickel nets enhanced, but also the characteristics of each layer of nickel net are retained; the defects of a single-layer nickel net in the aspects of catalyst loading, mass transfer performance and mechanical strength are effectively overcome.

The invention relates to the field of functional master batch materials, in particular to a phase-change energy temperature-adjusting fiber master batch and a fat-burning fabric thereof. The phase-change energy temperature-regulating fiber master batch is prepared from a composite phase-change material and polyethylene glycol terephthalate slices through melt extrusion and granulation, the fat-burning fabric is prepared from the phase-change energy temperature-adjusting fiber master batch and polyethylene glycol terephthalate slices through melt spinning, network compounding and weaving processing. By introducing the microencapsulated phase-change material and the high-thermal-conductivity filler, in the melt extrusion process, the microencapsulated phase-change material and the high-thermal-conductivity filler can be uniformly dispersed in the matrix material to form stable fiber master batches, form an efficient thermal-conductivity structure and provide excellent thermal regulation performance; meanwhile, microencapsulation can improve the stability and dispersity of the phase-change material, and the fat-burning fabric is prepared through melt spinning and weaving of fiber master batches, so that the heat-conducting property of the product is improved, and the continuous fat-burning effect is achieved.

The invention relates to an oil-resistant flame-retardant composite sealing material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. Fluororubber, nitrile rubber, ethylene propylene diene monomer, chlorinated polyethylene and maleic anhydride grafted polypropylene are adopted to prepare composite rubber according to a certain proportion; then adding hydrogenated polyisobutene, a vinyl polydimethylsiloxane-polymethylsiloxane silsesquioxane cross-linked polymer, an E-GMA-VA terpolymer, magnesium hydroxide, basalt fiber powder, ammonium polyphosphate, triphenyl phosphate, expansible graphite, zinc borate, a vulcanizing agent, an accelerant, an anti-aging agent, a plasticizer and other components according to a proportion, and performing banburying in special steps; the prepared sealing material has good mechanical properties, especially has oil resistance and flame retardance, and the service life is greatly prolonged.

The invention relates to the technical field of high polymer materials and preparation thereof, and discloses a wet anti-slip bionic friction pad on a glass surface, which is inspired by a micro-nano structure of toe pads of organisms such as tree frogs and long-horned grasshoppers with wet friction increasing characteristics, and a bulge array is added on the surface of a high-friction material, so that the friction coefficient of the friction pad is increased; the microstructure arrays can discharge a water film on the surface of the friction pad under the capillary action in a wet environment, and the effective contact area between solids is increased, so that the friction pad and a friction surface are always kept in a dry friction state, and stable friction force is ensured. The friction pad comprises a connecting layer, a supporting layer and a tail end protruding straight column array, a tail end contact layer is in a hexagonal straight column shape, the diameter of an inscribed circle of a hexagonal micro-column structure ranges from 5 micrometers to 5000 micrometers, column bodies are densely arranged in a hexagonal mode, the height of the column bodies ranges from 10 micrometers to 1500 micrometers, the tail ends of the column bodies are planes, the interval between every two column bodies ranges from 2 micrometers to 600 micrometers, and tight drainage grooves are formed.

The invention belongs to the technical field of solar cell materials, and particularly relates to silver-coated copper powder and a preparation method thereof. A preparation method of silver-coated copper powder comprises the following steps that copper powder subjected to surface activation through an acid-base solution and a complexing agent are dissolved in water, and copper powder turbid liquid is obtained; dropwise adding a silver source solution into the copper powder turbid liquid to carry out a replacement reaction, and adjusting the pH value of the solution after the reaction to obtain a silver-coated copper powder precursor turbid liquid; and dropwise adding a reducing agent solution into the silver-coated copper powder precursor turbid liquid, then dropwise adding a silver source solution, carrying out oxidation-reduction reaction, carrying out solid-liquid separation, washing, and drying to obtain the silver-coated copper powder. According to the preparation method provided by the invention, in the chemical oxidation reduction process, the silver-coated copper powder with different silver layer distribution structures, compact silver coating structure and better performance is obtained by regulating and controlling the dropping sequence and dropping rate of the reducing agent solution and the silver source solution.

The invention discloses a composite three-dimensional current collector prepared based on chemical plating, a metal negative electrode and a metal secondary battery, and belongs to the technical field of metal secondary batteries. The composite three-dimensional current collector comprises a nonmetal three-dimensional skeleton matrix and a metal coating which is uniformly distributed on the surface of the matrix through chemical plating. When the metal battery works, Mg, Li, Na, Ca, Zn and other metals are induced to be subjected to uniform electro-deposition and stripping on the surface of the composite three-dimensional current collector by virtue of affinity among metals, and the three-dimensional porous structure of the matrix provides a buffer space for metal deposition, so that metal ions are subjected to rapid and uniform electro-deposition; the stability of an electrode interface can be enhanced, dendritic crystal growth is reduced, the electrodeposition overpotential of metal is reduced, and the service life of a metal negative electrode is prolonged. The composite three-dimensional current collector prepared on the basis of chemical plating solves the problem of non-uniform growth of a metal negative electrode, and is an effective way for commercialized production of a metal secondary battery.

The invention discloses a graphdiyne multilayer composite membrane and a preparation method thereof, and belongs to the technical field of membrane separation. A porous base membrane with an alkynyl layer is obtained by adopting a two-step modification method, then the porous base membrane is soaked in a solution containing a graphdiyne monomer and a catalyst, and a reaction is performed at a certain temperature, so that a graphdiyne material fully grows on the surface of the porous base membrane. Adding a membrane casting solution formed by mixing an organic polymer, a cross-linking agent, a catalyst and an organic solvent to the surface of the graphdiyne-loaded porous base membrane, volatilizing the organic solvent, and curing at 80 DEG C to form the membrane. The ethanol permselective membrane has a three-layer membrane structure, namely the organic polymer layer, the ultrathin graphdiyne transition layer and the porous support layer, so that the problems of agglomeration and pore permeation of a nano material are effectively avoided, and the adsorption process of ethanol is further enhanced. The membrane prepared by the invention has higher pervaporation alcohol permeation performance, can efficiently and stably recover alcohols, and provides reference for the development of a novel pervaporation membrane structure with preferential alcohol permeation.

The invention discloses a nano metal oxide insulating material coated soft magnetic composite material and a preparation method thereof, and the preparation method comprises the following steps: (1) putting metal soft magnetic powder and a nano metal oxide insulating material into a steel cylinder equipped with a rotating blade, and rotating the blade to drive the raw material to flow to obtain core-shell composite powder; (2) carrying out annealing treatment on the core-shell type composite powder to obtain a precursor; and (3) mixing the precursor and a lubricant, then pressing the mixture into a green body, and carrying out annealing heat treatment on the green body in a protective atmosphere to obtain the soft magnetic composite material. The prepared soft magnetic composite material is uniform in insulating layer and high in coverage rate, the binding force between the nano metal oxide and the metal soft magnetic matrix is high, the thickness of the coating layer is controllable, the obtained soft magnetic composite material has high magnetic conductivity and lower loss, and the insulating coating method is mild in process condition, simple in equipment, short in coating treatment time, high in efficiency, low in cost and suitable for industrial production. The method is suitable for large-scale production.

The invention discloses a universal self-supervised learning Raman spectrum noise reduction method, which comprises the following steps of: 1, acquiring Raman data; step 2, preprocessing the Raman data, removing a baseline from the Raman data by using an adaptive iterative reweighted penalty least square method, and standardizing a spectrum after baseline removal to obtain preprocessed spectrum data; step 3, processing the preprocessed spectral data by using a down-sampling strategy H (.) to obtain two sub-spectrum sets h1 (.) and h2 (.) with independent noise, each sub-spectrum set comprising 10 sub-spectrums; and step 4, inputting the preprocessed spectrum data and the corresponding two sub-spectrum sets into a U-Net network f theta (.) to obtain a spectrum after noise reduction processing. The noise reduction method can carry out good noise reduction processing on various Raman data, and the self-supervised learning method does not need a complex long-time learning process.

The invention relates to a preparation method and application of a composite porous carbon-based negative electrode material with soft carbon coated with hard carbon. The preparation method comprises the following steps: (S1) carbonizing and activating a soft carbon material precursor to obtain soft carbon core particles; (S2) carrying out graft modification on the oxidized soft carbon inner core particles through dopamine polyethylene glycol silane, and then carrying out in-situ copolymerization reaction on the modified soft carbon inner core particles and dopamine to obtain organic silicon-polydopamine coated soft carbon composite particles; (S3) carrying out in-situ polymerization of phenolic aldehyde on the surfaces of the composite particles to form phenolic aldehyde coated soft carbon composite particles; (S4) carbonizing and activating the phenolic aldehyde coated soft carbon composite particles to obtain hard carbon coated soft carbon composite porous carbon; and (S5) carrying out silicon deposition and carbon coating on the composite porous carbon to obtain the composite porous carbon-based negative electrode material with soft carbon coated with hard carbon. When the composite porous carbon-based negative electrode material with the soft carbon coated with the hard carbon prepared by the invention is applied to a negative electrode of a lithium battery, the composite porous carbon-based negative electrode material has good electrochemical performance, and particularly has excellent cycle performance and compression resistance.

The high-strength gypsum fiber keel comprises a U-shaped keel structure and a tooth-shaped keel structure, the U-shaped keel structure comprises a first plate body, first mounting holes and outer edge plates, the outer edge plates are connected to the two ends of the first plate body, and meanwhile the first mounting holes are formed in the first plate body; and the tooth-shaped keel structure comprises a second plate body, a second mounting hole, a tooth groove and a convex plate. According to the high-strength gypsum fiber keel, by-product gypsum is adopted as a raw material of the keel and is a resource comprehensive reutilization material, the gypsum fiber keel is an inorganic material and an environment-friendly A1-level fireproof material, and gypsum is used as a keel material and is better combined with other surface materials such as gypsum jet wall mortar, so that the gypsum jet wall can be better combined with other surface materials; separation caused by thermal expansion and cold contraction during long-term use can be avoided, and meanwhile corrosion of light steel keel materials after long-term use is avoided.

The invention discloses an anti-ultraviolet ozone treatment silver nanowire composite transparent electrode and a preparation method thereof. The method comprises the following steps: firstly, coating a layer of silver nanowires on a transparent substrate, taking the silver nanowires as a cathode, taking a mixed aqueous solution of zinc nitrate and aluminum nitrate as an electrolyte, electrically depositing an aluminum-doped zinc oxide (AZO) protective layer on the silver nanowires, then coating a layer of stannic oxide nanocrystals (SnO2), and finally, carrying out electrodeposition on the transparent substrate. And carrying out heat treatment to obtain the silver nanowire composite transparent electrode subjected to anti-ultraviolet ozone treatment. The oxidation resistance and mechanical stability of the silver nanowire transparent conductive thin film can be remarkably improved, meanwhile, the excellent flexibility, conductivity and light transmission of the silver nanowire transparent conductive thin film are kept, the protection process of the silver nanowire is simplified, and the silver nanowire transparent conductive thin film has potential application in the field of flexible electronics.

The invention discloses an epoxy group modified zwitterionic polymer / heparin composite coating and a preparation method thereof. The preparation method comprises the following steps: firstly, constructing an amino-containing adhesion layer on the surface of a substrate by adopting a dip-coating method; then, the substrate is soaked in a mixed solution of the zwitterionic polymer and the heparin, and grafting of the zwitterionic polymer and the heparin on the surface of the medical material is completed through incubation. The coating provided by the invention has excellent hydrophilicity, can form a hydration layer, provides a physical barrier, and remarkably prevents adhesion and colonization of microorganisms. The inhibition rate of the coating on escherichia coli and staphylococcus aureus exceeds 99%, protein adhesion is remarkably reduced in an anti-protein adhesion experiment, and the coating is simple in strategy design, has a potential application prospect in the aspect of preventing blood contact catheter related infection and thrombosis, and has a wide application prospect. The complication occurrence rate and the medical care cost can be reduced.

The invention relates to the field of laser processing, and particularly discloses a laser cladding efficient cooling device which comprises a bearing plate, supporting rings are symmetrically arranged on the bearing plate, rotating ring discs are connected to the supporting rings through bearings, and driving mechanisms used for driving the rotating ring discs to rotate are arranged on the supporting rings. A clamping assembly used for clamping a workpiece is arranged on the rotating ring disc. The bearing plate is provided with a laser output device used for machining a workpiece. A supporting plate is arranged on the rotating ring disc, and a sliding assembly is arranged on the supporting plate. By means of rotation of the device, when the periphery of a workpiece is machined, the cooling assembly continuously blows cold air and adjusts the output temperature of the laser output equipment, so that the temperature is always kept within the normal range, effective combination of a coating and the workpiece is facilitated, the quality of the workpiece is improved, and the machining efficiency is improved; rapid cooling of the coating and the workpiece is facilitated, and forming of a standard machined part is facilitated.

The invention discloses a composite rubber material with wear resistance and high tear strength and a preparation method of the composite rubber material, and belongs to the technical field of rubber material processing. The technical problem that the enhancement effect of the filler on the wear resistance, tear resistance and mechanical strength of a rubber matrix needs to be further improved exists in the prior art. The composite material comprises the following components in parts by weight: 100-110 parts of internal mixed rubber, 1-2 parts of a vulcanization accelerator and 2-3 parts of a vulcanizing agent, modified polybutadiene is reinforced by aramid pulp, modified carbon black and modified graphene to prepare composite polybutadiene, and then styrene butadiene rubber is reinforced and modified by the prepared composite polybutadiene and silicone rubber to prepare the composite material. By improving the degree of crosslinking between material molecules and optimizing material composition, the wear resistance and tear resistance of the composite rubber material are effectively improved, and the mechanical property of the composite rubber material is also improved.

The invention discloses a simulation method for abrasive particle vibration machining based on reaction molecular dynamics, and relates to the technical field of reaction molecular dynamics, a vibration auxiliary model of a Si surface of 4H-SiC is established, the process of vibration auxiliary chemical mechanical polishing of diamond abrasive particles in the Z-axis direction is simulated, the Si surface model of the 4H-SiC is consistent with an actual machining surface of silicon carbide, and the abrasive particle vibration machining simulation method is suitable for the actual machining surface of silicon carbide. The vibration direction of the vibration auxiliary simulation is consistent with the motion direction of the abrasive particles in the actual chemical mechanical polishing process, so that the acting force and motion trail simulation of the diamond abrasive particle model in the polishing process are more real, and the simulation process is closer to the actual machining process; the atom removal mechanism of the Si surface of 4H-SiC under the conditions of different vibration amplitudes and frequencies and different scratching depths can be researched, so that a chemical mechanical polishing technology is conveniently optimized by ultrasonic vibration, and the polishing quality of silicon carbide is further improved; the technical problem that an existing vibration auxiliary model based on reaction molecular dynamics simulation cannot effectively optimize the chemical mechanical polishing process of silicon carbide is solved.

The invention relates to a wide-temperature high-precision optical acceleration sensitive chip and sensor based on a microcavity interferometer principle and a manufacturing method thereof, the wide-temperature high-precision optical acceleration sensitive chip comprises a first substrate, a second substrate and a third substrate, an optical fiber mounting seat and a light through hole are formed on the first substrate, a beam structure and an inertial mass block are processed on the second substrate, and the beam structure is arranged on the third substrate. The first substrate, the second substrate and the third substrate are all made of double-polished super-flat silicon wafers, a single-mode optical fiber assembly is fixed to the optical fiber installation base, the end face of the single-mode optical fiber assembly is subjected to precise grinding and is perpendicular to the axial direction of an optical fiber core, and a first cavity mirror is formed by means of the end face of the side, facing the light through hole, of the inertial mass block. A second cavity mirror is formed on the end face of the single-mode optical fiber assembly, the first cavity mirror and the second cavity mirror form an F-P interference cavity, and the first substrate, the second substrate and the third substrate are connected through the silicon-silicon bonding technology.

The invention relates to an aluminum alloy chemical mechanical polishing solution and a preparation method and application thereof.The polishing solution is prepared from, by mass, 20%-30% of grinding materials, 1%-5% of oxidizing agents, 0.01%-1% of complexing agents, 0.01%-1% of pH regulators and the balance deionized water; wherein the complexing agent is a mixture of a first complexing agent and a second complexing agent, the first complexing agent is short-carbon-chain organic acid with the carbon atom number of 2-4, and the second complexing agent is long-carbon-chain organic acid with the carbon atom number of 8-10; the grinding material is a mixture of aluminum oxide and silicon dioxide, and the silicon dioxide is a mixture with the particle size of 10-40 nm, 40-70 nm and 90-110 nm. Compared with the prior art, the method has the advantages that the removal rate can be increased, and the surface roughness of the workpiece is reduced.

The invention relates to the technical field of ceramics, and discloses a ceramic tile with a golden velvet texture and a recarved raw stone effect and a preparation method of the ceramic tile. The ceramic tile comprises a green body layer, a cover glaze layer, a pattern texture layer, a digital deep ink layer and a dry granular glaze layer which are sequentially arranged from bottom to top, the digital deep ink layer is composed of digital matte deep ink; the dry granular glaze layer is composed of dry granular glaze; a surface tension difference is formed between the digital matte deep ink and the dry granular glaze. By improving the digital matte deep ink, the digital matte deep ink can be combined with the dry granular glaze, and a matte three-dimensional non-collapse effect is formed on the glaze surface; the dry granular glaze is improved, so that the dry granular glaze has better physical properties; through the improvement of the suspending agent, the suspending agent can generate relatively strong combining capacity with dry particles, so that the dry particle glaze has relatively strong polarity, and can form enough repulsive force when being combined with digital matte deep ink with strong hydrophobicity, so as to form a finer and three-dimensional concave-convex fluctuating effect.

The invention relates to a composite multi-effect scale and corrosion inhibitor and a preparation method thereof, and belongs to the technical field of water treatment agents.The composite multi-effect scale and corrosion inhibitor is prepared from carboxylic acid monomers, sulfonate monomers, organophosphorus compounds, modified chitosan, modified nanometer titania, oxidation type initiators, reduction type initiators, azole derivatives and the like, the modified chitosan is formed by coating the surface of chitosan with cerium chloride; the modified nano titanium dioxide is formed by coating the surface of nano titanium dioxide with sodium polyaspartate. The composite multi-effect scale and corrosion inhibitor is prepared in a mode of compounding while synthesizing, the scale inhibition effect is excellent, the comprehensive descaling capacity can reach 97% or above, and the composite multi-effect scale and corrosion inhibitor can be used for a high-pH, high-alkalinity, high-temperature and high-hardness circulating cooling water system under the high-concentration-multiple operation condition; the method is suitable for circulating cooling water treatment requirements under harsh conditions in industries such as chemical industry, smelting and light industry.

The invention discloses a heat insulation aluminum profile and a preparation method thereof, and belongs to the technical field of aluminum profile preparation. The heat insulation coating is electrostatically sprayed on the surface of the aluminum profile, the coating takes epoxy resin as a matrix, the aluminum profile is separated from the external environment, and the corrosion resistance and the heat insulation performance of the aluminum profile are improved; compared with common nano ATO, the prepared modified nano ATO has better compatibility with an epoxy resin matrix, the agglomeration phenomenon is obviously reduced, and the heat insulation performance of the coating can be greatly enhanced; the prepared modifier can significantly enhance the flame retardance and heat resistance of the coating, can promote curing of epoxy resin, is grafted on nano ATO, and is stable in performance and not prone to falling off; therefore, the prepared aluminum profile is excellent in heat insulation property and corrosion resistance, the coating sprayed on the surface of the aluminum profile has stable and efficient flame retardance and heat resistance, and the aluminum profile has important application value in the technical field of aluminum profile preparation.

The invention belongs to the technical field of medicines, and particularly relates to a disulfide cyclic peptide compound of a melanocortin receptor agonist based on polypeptide small molecules, and the disulfide cyclic peptide compound has the following structure: R2-R1-c (Cys-D-Ala-His-D-Phe-Arg-Trp-Cys)-R3-R4, wherein R2 and R4 are respectively and independently selected from an amino group, an acetyl group or a palmitoyl group; r1 and R3 are independently selected from Ile, Arg, D-Phe, Pro or deletion, R1 and R3 are not deleted at the same time, and when R1 or R3 is deleted, at least one of R2 and R4 is a palmitoyl group. The disulfide cyclopeptide compound provided by the invention has relatively good selectivity on melanocortin receptors (MCR1, MCR3, MCR4 and MCR5).

The invention relates to an edge display diffraction optical waveguide and a design method and application thereof. The diffraction optical waveguide comprises a coupling-in area, a transition area and a coupling-out area which are sequentially arranged along a light beam transmission path. Wherein a light beam transmission path needs to meet a grating vector closing relation, so that after being totally reflected in the diffraction optical waveguide, a light beam incident from the coupling-in region is emitted through the coupling-out region and is imaged in an edge view field region of the diffraction optical waveguide; the width and height of the out-of-coupling area in the eye head-up field are determined according to the eye movement range, the exit pupil distance and the field area; the range of the coupling-in area is determined according to a preset distance between the coupling-in area and the coupling-out area; the range of the turning region is determined according to a k-vector range from the coupling-in region to the coupling-out region and a k-vector range from the coupling-in region to the turning region. According to the invention, the virtual image is presented in the edge view field area without shielding the central view field area, so that not only can good combination of virtual and real scenes be realized, but also the problems of rainbow lines, light leakage and the like can be well avoided.