65results about How to "Uniform and dense distribution" patented technology

The invention provides a superpixel method for medical image segmentation. The method comprises the steps of: processing a medical image into a superpixel; for the medical images obtained after superpixel segmentation, using bilateral filtering to preserve the edge and filter the noise to reduce the error rate of the network model; configuring a network framework, and constructing a convolution network for the medical images obtained after superpixel segmentation by iterative training parameters. Based on the linear iterative clustering segmentation method, this method applies the thought of the U-Net network to the post-optimization of super-pixels, which makes up the defect of inaccurate segmentation of inner edge of super-pixel, increases the standard layer to improve the weight sensitivity of each network layer, improves the convergence performance of the network, and makes the segmentation result closer to the actual value. Because the anatomical structure and pathological tissueof medical images are very clear, the medical images segmented by SLIC algorithm can obtain more comprehensive super-pixel, and the edge accuracy of super-pixel can be further improved by convolutionnetwork.

The invention provides a method for preparing a high-performance molybdenum-based hydrogen evolution electrode by phosphatizing a molybdate precursor and belongs to the fields of water electrolysis and electric catalytic hydrogen evolution in the chlor-alkali industry. The method comprises the steps of pre-processing foamed nickel, growing the molybdate precursor in situ on the surface of a pre-processed foamed nickel base with the hydrothermal synthesis method, and finally placing the prepared precursor and a phosphorus source into a rube furnace together for phosphating of the molybdate precursor so that the high-performance molybdenum-based hydrogen evolution electrode can be prepared. The method is novel, the technology adopted is simple, production cost is low, the requirement for equipment is low, and the method is suitable for industrial production. Furthermore, the electrode is large in specific area, can be combined with the base firmly, has excellent hydrogen evolution activity and stability, and can be widely applied to the fields of water electrolysis and hydrogen evolution in the chlor-alkali industry.

The invention discloses a preparation method of absorbent polymer which is characterized in high speed rate of liquid absorption, good dispersibility and high dry-touch degree. Acrylic acid is added into sodium hydroxide aqueous solution, which is uniformly mixed with acrylamide and then crosslinking agent, and foam stabilizer aqueous solution is added; while being aerated with nitrogen gas, the solution is ordinally added with polymerization initiator azodi (2-amidinopropane hydrochloride) aqueous solution, ammonium persulphate aqueous solution, sodium bisulfite aqueous solution and uniformly mixed; the aeration of nitrogen gas is stopped, and when the temperature of the solution is raised to 35 to 45 DEG C, the solution is added with foamer aqueous solution and uniformly mixed, so that porous gel is obtained; when the temperature is raised to 100 DEG C to 110 DEG C, the porous gel is put in the temperature environment of 80 to 90 DEG C for two the three hours; after being cooled down, the porous gel is taken out of a container, scissored into pieces, dried, crumbled and filtered, and grains are collected; crosslinking treatment agent is sprayed on the surface of grains, and after stirring and heating, the absorbent polymer is obtained. In three minutes, the volume of saline absorbed by the product prepared by the invention can reach 70 ml/gSAP.

The invention discloses a method for acquiring two-dimensional distribution of sediment dissolved reactive phosphorus (DRP), which comprises: vertically placing a diffusion gradient in thin-films (DGT) device containing a modified phosphorus immobilizing film in a sediment to extract the DRP in the section of the sediment by using modified ZrO2 polyacrylamide gel thin film, in which the particle size of zirconium dioxide is less than or equal to 5mu m, as a phosphorus immobilizing film based on a DGT principle, and keeping 3 to 5 centimeters of overlying water; marking a sediment-water interface, taking out the immobilizing film, and performing two-dimensional and submillimeter slicing on the part below the interface; and extracting the DRP in the slices by using NaOH, measuring the DRP content in the extract by using microcolorimetry, converting the DRP content into the DRP solid content in the slices, calculating the DRP concentration at the corresponding position in the section of the sediment based on Fick's first law of diffusion, and drawing a two-dimensional distribution map.

The invention discloses a preparation method of a nanometer palladium-graphene three-dimensional porous composite electrocatalyst. The preparation method comprises the following steps: cleaning foamed nickel by sequentially adopting glacial acetic acid, acetone, ethanol and deionized water; preparing a graphene oxide water solution with the mass concentration of 0.5-10 mg/mL, then directly soaking the foamed nickel into the graphene oxide water solution, and standing for reaction to form a three-dimensional porous structural foamed nickel-graphene product; directly soaking the foamed nickel-graphene product into a potassium chloropalladate water solution with the molar concentration of 0.05-1 mmol/L; and after the reaction is finished, taking out the foamed nickel-graphene product so as to generate a graphene composite electrocatalyst product which has a three-dimensional porous structure and is loaded with a palladium nanoparticle. By the preparation method disclosed by the invention, the three-dimensional porous graphene foamed product loaded with the palladium nanoparticle can be obtained only through simple two-step soaking operation; and in addition, the three-dimensional porous graphene foamed product is excellent in property and high in stability and can be directly used as the positive pole of an ethanol fuel cell.

The invention discloses a method for preparing a graphene-modified tin oxide lithium ion battery negative material by adopting a sol in-situ electrostatic copolymerization sedimentation method, and belongs to the technical fields of material science and secondary power sources. The preparation process comprises the steps of dropwise feeding prepared Sn(OH)2 sol with positive surface charges into graphene oxide sol with negative surface charges, and enabling the two kinds of sol to be subjected to in-situ electrostatic copolymerization sedimentation under the action of electrostatic force to generate black flocculated precipitate; and centrifuging, washing, drying the precipitate, and then reducing by calcining the dried precipitate at the temperature of 400-600 DEG C under a nitrogen atmosphere to obtain the graphene-modified tin oxide lithium ion battery negative material. According to the method, the reaction process is carried out in a neutral water solution, other reagents are not needed, the precipitation reaction is fully carried out, the phenomenon is obvious, and the separating and the washing are easily carried out; the prepared lithium ion battery negative material has the excellent electrochemical capacity performance, cycle performance and rate capability, and has the very wide market application prospect in the lithium ion battery industry.

The invention discloses a method for producing an urchin-like nano TixSn1-xO2/graphene three-dimensional composite material and an application of the composite material on a negative electrode of a lithium ion battery. The urchin-like nano TixSn1-xO2/graphene three-dimensional composite material is produced by a one-step hydro-thermal synthesis technology through self-assembly by using a coordination principle and a molecule self-assembly method. The method comprises the following steps: 1) preparing oxidized graphene, 2) preparing a graphite oxide sol with surface having negative electricity; and 3) producing the urchin-like nano TixSn1-xO2/graphene three-dimensional composite material through reduction. The reaction process is carried out in an aqueous solution, other reagents are not required, and the method has the advantages of simple process, low cost, energy saving, environmental protection, and easy industrial batch production. As the negative electrode material of lithium ion battery, the three-dimensional composite structure of the material is in favor of diffusion of an electrolyte in the composite material as well as transmission of electron and ion in the material, and performances such as charge and discharge capacity, cycle life and multiplying power of the composite material can be effectively increased.

The invention relates to a method for performing surface modification on a metal by ultrasonic nano-welding and belongs to the technical field of nanomaterials. The method comprises the following steps: cleaning a to-be-treated region of the surface of the metal, coating a nanopowder material on the metal surface after cleaning, and performing ultrasonic nano-welding process on the nanopowder material on the metal surface to obtain a modified metal surface. The method is simple to operate and has controllable welding parameters. The nanomaterial and the welding region of the metal substrate form a local miscible body, leading to good interface infiltration, which enhances mechanical bonding effect and gives full play to reinforcement function of the nanomaterial. The nanomaterial is distributed densely and uniformly on the metal surface, and the surface is smooth and clean and has no cracks or air hole.

The invention relates to a composite material taking foam nickel as a matrix and a preparation method of the composite material. The preparation method includes following steps: (1), preparing a graphene oxide water solution of 1.0-10.0 mg/mL; (2), soaking the foam nickel in the graphene oxide water solution, and performing ultrasonic treatment and material drying to obtain a foam nickel-graphene oxide composite product; (3), dissolving palladium acetylacetonate and potassium halide in N, N-dimethyl formamide, soaking the foam nickel-graphene oxide composite product in an N, N-dimethyl formamide solution for reaction for 1-6 h at 100-200 DEG C, cooling, separating, cleaning, and drying to obtain the composite material. By using the preparation method, the problems of stacking and irreversible aggregation of reduced graphene oxide are relieved effectively, size of palladium particles obtained by reduction reaches nanoscale, and the palladium particles are uniformly distributed on graphene, so that electrocatalytic activity of the palladium particles is improved fully.

The invention discloses an automobile sheet metal piece welding material and welding technology, and belongs to the technical field of machining. The automobile sheet metal piece welding material comprises the following raw materials of tin, zinc, neodymium, cadmium, copper, magnesium, aluminum, silver chloride, rare metal alloy, manganese, calcium, phosphorus, sulphur, bauxite powder, silicone and super-fine inorganic cellucotton. The automobile sheet metal piece welding technology comprises the steps of welding rod preparing, preheating, spot welding, annealing and the like. According to theautomobile sheet metal piece welding material and welding technology, the bauxite powder, the silicone and the super-fine inorganic cellucotton are adopted as a reinforcement system, and the weldingstrength and corrosion resistance of the automobile sheet metal piece welding material are improved.

The invention provides an anti-rust nanocrystal alloy and a fabrication method thereof, and belongs to the technical field of magnetic material preparation. The anti-rust nanocrystal alloy comprises the following element constituents based on percent by mass: 4.5-6.8% of Cr, 6.2-10.5% of Si, 1.5-3.6% of B, 1.0-2.5% of Mn, 3.2-7.5% of Nb, 0.6-2.0% of Cu and 0.5-1.2% of Ni with the balance being Fe.By optimizing alloy element constituents and proportion and improving a thermal treatment mode, the nanocrystal alloy product compatible with excellent anti-rust performance and favorable soft magnetic performance is obtained.

The invention discloses a method for growing titanium dioxide nano-particles on the surface of a titanium or titanium alloy substrate. The method comprises the following steps of carrying out hydrothermal treatment on the surface of the titanium or titanium alloy substrate by using a hydrothermal solution to grow and form the titanium dioxide nano-particles on the surface of the substrate, and thehydrothermal solution adopts a salt solution containing chloride ions and/or fluoride ions. According to the method, the nano-particles which are uniform and compact in distribution and controllablein size can be obtained on the surface of the titanium or titanium alloy substrate; the method is simple and convenient in process, low in treatment temperature, low in cost, clean, environment-friendly, high in practicability and high in operability, can be used for regulating and controlling the nano-particles with different sizes on the titanium surface, can be used for modifying the surface ofthe titanium and titanium alloy substrate, and provides a new method for titanium surface treatment.

The invention discloses a polyvinyl chloride composite foaming material comprising the following raw materials in parts by weight: 68-72 parts of polyvinyl chloride resin, 12-14 parts of dibutyltin maleate, 15-17 parts of a composite carbon nanotube monomer, 68-73 parts of an initiator, 1-2 parts of a plasticizer, 2-3 parts of an antioxidant, 5-7 parts of an anti-aging filler, 6-9 parts of formaldehyde, 3-5 parts of a polyurethane foaming agent, and 170-180 parts of tetrahydrofuran. By addition of the composite carbon nanotube monomer in the material, carbon nanotubes can be grafted onto a polyvinyl chloride branch chain through free radical polymerization, the tensile strength and the impact resistance ability of a foaming material can be greatly improved, particularly, the foaming material is not easy to break and deform when bearing large pressure or impact force, the problem that a conventional polyvinyl chloride foaming material has many bubble holes in the material so as to leadto reduction of the impact resistance of the foaming material is solved, and then the material can keep a shape unchanged under the relatively strong action.

The invention relates to a nontoxic environment-friendly stable-foaming ultralow-density composite material for producing a polyimide-polyvinyl chloride composite foam material, a method for producing the polyimide-polyvinyl chloride composite foam material from the composite material and a polyimide-polyvinyl chloride composite foam material produced by the method. The minimum density of the prepared foam is 30 kg/m<3>, the compression strength is greater than 0.7 MPa, the tensile strength is greater than 1.7 MPa, the heat conductivity coefficient is less than 0.033 w/m.k, the oxygen index is greater than 28%, the water absorptivity is less than 10%, the closed-cell ratio is greater than 80%, the 70-DEG C relative humidity is 95%, and the foam does not shrink after being placed for more than 96 hours. The preparation process is safe and nontoxic, does not use any chemical foaming agent, and prepares the foam under ordinary pressure. Compared with the traditional formula, the tensile strength and compression strength of the foam are obviously enhanced, and the foam density is obviously lowered.

The invention relates to a preparation method of a rubber foaming material with a bubble inner wall shell. In order to improve the dimensional stability of the rubber foam material, a thermoplastic polymer and inorganic particles (including spheres, rods and sheets) are usually added into a foam matrix to construct a scaffold structure for hindering molecular chain recovery; since the rigid strength of the thermoplastic polymer that can be processed and foamed together with rubber is insufficient to solve the problem of its dimensional stability. A large number of inorganic particles are introduced, so that the mechanical property of the foaming material is reduced, and meanwhile, organic modification needs to be carried out, which brings difficulty to industrial production. According to the invention, styrene butadiene rubber and an ethylene-vinyl acetate copolymer are used as foaming matrixes, and a small amount of epoxy resin is introduced to regulate and control zinc oxide to be compactly and uniformly dispersed on the inner walls of bubbles to form a layer of inner shell structure; the size stability and the mechanical property of the foaming material are enhanced.

The invention discloses an anti-corrosion treatment method for an inner wall of a drill pipe. The inner wall of the drill pipe is electroplated, an electroplating treatment process is divided into two stages, the first stage is electroplating of a semi-bright nickel plating layer, and the thickness of a plating layer is 8-25; and in the second stage, a nickel-tungsten-phosphorus-zirconium oxide plating layer is electroplated, and the thickness of the plating layer is 18-30. The technological process is perfect and effective. The corrosion resistance of the plating layer can be effectively guaranteed, and the production cost can be reduced. The plating layer is uniform in color and luster, smooth in surface, wear-resistant, high in stability, economical and effective, and the abrasion loss of the tool is reduced.