15results about How to "Structural refinement" patented technology

The invention discloses an MRI (Magnetic Resonance Imaging) brain tumor segmentation method based on a multi-scale attention mechanism and a secondary segmentation strategy, and belongs to the field of semantic segmentation. The method comprises the following steps: firstly, acquiring MRI brain tumor data and preprocessing the MRI brain tumor data; secondly, designing a 3D U-Net model, and combining a multi-scale attention mechanism and depth separable convolution to extract features; then, secondary segmentation guided by a cascade strategy is introduced; and finally, predicting by using the optimal model, storing and verifying a result, and calculating and comparing evaluation indexes. A depth separable convolution module is used for replacing a traditional convolution module, so that the parameter and calculation cost is reduced, and the segmentation precision is kept. In addition, a multi-scale attention fusion module is introduced to the first two layers of the encoder, the ability of capturing shallow information is enhanced, and important features are further extracted. A cascade attention mechanism is introduced into a decoder, and the segmentation capability of a small target area is improved. And training is carried out through a BraTS2020 data set, and the result shows that the optimized network significantly improves the MRI brain tumor segmentation accuracy.

The invention discloses an oxidized crosslinked asphalt coated resin hard carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S1, pre-treating resin to obtain a resin precursor; s2, performing mechanical pulverization, low-temperature pre-carbonization and airflow pulverization treatment on the resin precursor to obtain low-temperature pre-carbonized ground powder; s3, the low-temperature pre-carbonized ground powder is subjected to activation pore forming and high-temperature carbonization treatment, and resin hard carbon is obtained; s4, uniformly mixing the resin hard carbon and the asphalt to obtain a mixture; s5, performing asphalt melting coating and low-temperature oxidation cross-linking treatment on the mixture to obtain oxidation cross-linked asphalt coated resin hard carbon; s6, performing high-temperature carbonization treatment on the oxidized cross-linked asphalt coated resin hard carbon to obtain coated hard carbon; and S7, carrying out post-treatment on the coated hard carbon to obtain the oxidized crosslinked asphalt coated resin hard carbon negative electrode material. The oxidized cross-linked asphalt coated resin hard carbon negative electrode material has a relatively low specific surface area, and the first reversible capacity and the initial coulombic efficiency of a battery can be remarkably improved.

The invention relates to the technical field of image recognition, and particularly provides a road target monitoring method, system and device and a storage medium, and the method comprises the steps: obtaining a road monitoring video stream, converting the road monitoring video stream into an image frame sequence, and carrying out the preprocessing of image frames; identifying a road target in each image frame by using a target detection algorithm, and generating a track of the road target in the image frame sequence by using a multi-target tracking algorithm; performing anomaly analysis on the trajectory based on a preset rule, and identifying an abnormal trajectory; and obtaining a confidence score of an abnormal road target to which the abnormal track belongs, screening out a target detection frame with the highest score, and extracting feature information of the road target from the target detection frame. According to the invention, the speed and precision of road target identification in a complex environment are improved, an abnormal analysis and subsequent processing method of the moving track is provided, the quality of road target monitoring is improved, and a data basis is provided for road management.

The invention discloses a manganese-copper alloy material with stable resistance and a preparation method of the manganese-copper alloy material. The manganese-copper alloy material comprises the following components in percentage by mass: 11-13% of manganese, 0.5-1.5% of copper, 0.3-1% of indium and 0.05-0.15% of trace rare earth elements, the preparation method of the manganese-copper alloy material with stable resistance comprises the following steps: S1, premixing; s2, carrying out preforming; the method has the following beneficial effects that fine and uniform mixing is achieved through the microchannels and the like, and composition segregation is avoided; the pulse current preforming is efficient and rapid, and the boron nitride coating mold guarantees the quality and density uniformity of a preforming block; the self-adaptive air pressure regulation and control smelting system accurately controls the temperature, the air pressure and the speed of each stage, monitors and adjusts in real time, promotes atomic diffusion and alloying, improves the product quality and the qualified rate, reduces the rejection rate, and has the characteristics of efficient and stable production and wide application prospects.

The invention belongs to the technical field of laser welding defect prediction, and discloses an aluminum alloy laser welding seam three-dimensional solidification crack sensitivity prediction method, which comprises the following steps: accurately calculating a lap joint temperature / solid fraction (TB / fB) and a T-fS curve of adjacent dendrites of a polycrystalline structure in a welding seam pasty area through laser welding macro-micro thermal mass coupling simulation; a novel solidification crack sensitivity prediction method fusing microstructure information is provided, accurate prediction of the solidification crack sensitivity of aluminum alloy laser welding is achieved, the solidification crack inhibition mechanism that an ultra-fine equiaxed crystal structure shortens an intergranular liquid phase channel and reduces solute segregation is disclosed, and the stability of the solidification crack sensitivity is improved. The method has very important engineering application significance for realizing solidification crack-free welding of the high-strength aluminum alloy thick-wall component.

The invention discloses a thick-wall titanium alloy electron beam welding joint structure refining method and application. The invention belongs to the field of thick-wall titanium alloy welding. The method aims at solving the technical problem that an existing thick-wall titanium alloy electron beam welding joint is not high in comprehensive performance. The method comprises the following steps: taking a lamellar Ti-6Al-4V-x-y alloy as a welding filler, placing the lamellar Ti-6Al-4V-x-y alloy between plates to be welded, and realizing connection by adopting electron beam welding; wherein x is Cu, Fe, Ni, Mo or Be, y is Si, Y or B, x is equal to 1-10 wt.%, and y is equal to 0.1-1 wt.%. According to the method, the structure of the welded joint is obviously refined, and the comprehensive performance of the welded joint is improved. The obtained joint is applied to the fields of aerospace, weaponry, ocean engineering and the like.

The invention belongs to the technical field of semiconductors, and discloses a composite coating for a semiconductor device and a preparation method thereof.The preparation method comprises the following preparation steps that organic resin and a carburant are added into an alcohol solvent to be evenly mixed, and a resin solution is obtained; the method comprises the following steps: adding a tantalum source and a phase forming accelerant into an alcohol solvent, stirring and mixing to obtain a tantalum solution; the surface of the base body is coated with a resin solution and a tantalum solution, heating curing, carbonization and cooling are carried out, a composite coating containing glassy carbon and tantalum carbide is obtained, and the composite coating is of a single-layer structure or a double-layer structure; the single-layer structure is a composite single-layer coating containing glassy carbon and tantalum carbide; the double-layer structure is a double-layer coating structure comprising a glassy carbon layer and a glassy carbon and tantalum carbide composite layer from bottom to top from one side of the surface of the base body. The density of the composite coating prepared by the method can be effectively improved, so that the corrosion resistance of the composite coating in a plasma environment is improved.

The invention discloses an aluminum alloy for preparing a traction beam of an external bogie of a train and a preparation method of the aluminum alloy, and belongs to the technical field of alloys for high-speed trains. The aluminum alloy contains Zn, Mg, Cu, Zr, Ti, Mn, Ni, La and other elements, and lanthanum can refine grains, improve the metallographic structure and form a dispersion strengthening phase, so that the strength and toughness of the alloy are improved; the nickel and the aluminum element can form a solid solution, so that the alloy structure is more compact, and the obtained aluminum alloy shows higher resistance when bearing external force and is not prone to deformation or fracture. According to the method, the aluminum alloy is manufactured through two-step superplastic die forging, after two-step die forging, plastic deformation of the alloy is uniform, the grain size is small and uniform, mechanical properties of the aluminum alloy are improved, the aluminum alloy particularly has good fatigue performance, and the aluminum alloy has good safety and reliability while light weight of the aluminum alloy is guaranteed.

The invention discloses a phase-change emulsion for phase-change temperature-adjusting cellulose fibers and a preparation method of the phase-change temperature-adjusting cellulose fibers. The phase-change emulsion comprises the following components: 20-30 wt% of a phase-change material, 1-3 wt% of a nucleating agent with an antibacterial function, 1-3 wt% of protein colloid particles, 0.3-0.5 wt% of a surfactant and the balance of deionized water. Adding the phase change emulsion into a prepared cellulose solution by adopting a pre-spinning injection method to obtain a phase change spinning solution; the phase-change spinning solution is coagulated and formed through a spinning bath, then enters an air bath to be drafted, and then is cut off, desulfurized, pickled, washed, bleached, oiled and dried to prepare the phase-change temperature-adjusting cellulose fiber. The phase-change emulsion is low in supercooling degree, good in compatibility with a cellulose solution and used for preparing phase-change temperature-adjusting cellulose fibers, the spinnability is good during spinning, the production process is stable, and the fiber strength after spinning forming is high.

The present invention provides a cement adhesive and a preparation method and application thereof, belonging to the technical field of cement adhesives. The cement adhesive provided by the present invention comprises the following components: aluminate cement, artificial porcelain sand, silicon micropowder, admixture and water; the admixture comprises silicon carbide and epoxy resin. In the present invention, silicon carbide and epoxy resin can synergistically improve the compressive strength and flexural strength of the cement adhesive, wherein the epoxy resin has excellent bonding properties and strength, can be tightly combined with the cement matrix to form a strong composite, and can fill the pores of the cement matrix during the curing process to reduce the formation of voids and cracks; the addition of silicon carbide further refines the structure, making the pores smaller and evenly distributed, significantly improving the overall hardness and wear resistance.

The invention discloses an automatic production device and method for a high-stability hypochlorous acid water finished product. The automatic production device comprises a production tank, a stabilizer supply port and an automatic stabilizer adding device, a transmission belt is arranged below the production tank, a positioning station, a fixing and filling positioning station, a stabilizer feeding and processing station, a sealing station and a finished product station are sequentially arranged below the production tank, a finished product bottle is arranged on the transmission belt, a sealing device is arranged above the sealing station, a stabilizer feeding device is arranged above the stabilizer feeding and processing station, and a finished product bottle is arranged on the finished product bottle. The stabilizer supply port is communicated with the stabilizer adder through an automatic stabilizer adding device; a hypochlorous acid water adding device is arranged above the fixing and filling positioning device, a bottom outlet of the production tank is communicated with an inlet of the hypochlorous acid water adding device, and hypochlorous acid finished products produced by the device and the method are convenient to store and transport.

The application discloses a preparation method and application of a collagen packaging film, and belongs to the technical field of bio-based food packaging materials. According to the method, animal-derived collagen is dissolved in an acetic acid solution with a pH of 3.5-4.5 to form a solution with a concentration of 3-5%, and then 15-25% of genipin and 8-12% of cellulose nanowhiskers by dry weight of the collagen are added in sequence to perform a cross-linking reaction at 35-40 DEG C, so as to construct a three-dimensional network structure. Subsequently, the solution is soaked in 70-80% ethanol containing 0.5-1.5% propyl gallate, and the surface hydrophobicity is improved through the specific combination of phenolic hydroxyl groups and the hydrophobic region of collagen. Finally, vacuum drying and 60-70% humidity environment balancing treatment are performed, so that the degradable film material with high mechanical strength and moderate waterproofness is obtained. The preparation method is especially suitable for the preservation packaging of chilled meat products, and can effectively prolong the shelf life of food while maintaining the biodegradability of the material.

The invention discloses a lithium-rich alloy for a high-specific-energy battery and a preparation method thereof.The preparation method of the lithium-rich alloy for the high-specific-energy battery comprises the following steps that S1, a certain mass of pure lithium ingot is put into a stainless steel crucible and heated to 300-500 DEG C till the pure lithium ingot is completely molten, and lithium liquid is obtained; s2, a certain mass of metal elements are added into the lithium liquid, heating and stirring are carried out to enable the metal elements to completely react with the lithium liquid, alloy mixed liquid is obtained, and the content of the metal elements does not exceed 50 wt%; s3, casting the alloy mixed solution into a stainless steel mold, and cooling to obtain an alloy ingot; s4, rolling and cutting the alloy ingot to obtain a sheet; s5, the sheet is placed in a dry air or inert gas atmosphere, the temperature is increased to 100-150 DEG C, and heat preservation is conducted for 0.5-4 h; and S6, the sheet is taken out and cooled to the room temperature, and then the lithium-rich alloy is obtained. The method has the advantages that the second phase can be refined, so that the distribution of the second phase in the alloy is more uniform, and the cycle performance of the lithium metal battery can be improved.

The utility model discloses a soil body channel indoor detection device, which comprises a walk-in type environment test box, a channel model, a deformation monitoring system and a temperature and moisture monitoring system, the walk-in type environment test box is provided with a door, an observation window and a temperature control system, the top of the walk-in type environment test box is provided with a water spraying mechanism, and the water spraying mechanism is connected with the channel model. The channel model is located in the walk-in environment test box and comprises an outer template, an inner template and a soil body component. The beneficial effects of the utility model are that the device employs the pull rope sensor to detect the total deformation, combines the pattern angle recognition, can accurately calculate the three-dimensional deformation in the soil body, builds an equal-scale model which is 1: 1 with a solid channel, can simulate various working conditions of the channel, such as air temperature, rainfall and underground water level changes, and the combination of the working conditions. Test detection is carried out aiming at the environment working condition of an engineering area, the authenticity state of the channel frost heaving and thaw collapse process is restored, and engineering practice is fitted.

The invention relates to a composite sand powder material and a preparation method and application thereof. The preparation method of the material comprises the following steps: mixing sodium silicate bonded foundry waste sand with waste gypsum, carrying out a hydrothermal reaction on sodium silicate and calcium sulfate in the waste gypsum, removing sodium silicate and generating calcium silicate with good fire resistance, then calcining to enable calcium sulfate and silicon dioxide to generate calcium silicate, and finally, carrying out heat treatment on the calcium silicate. Calcium sulfate is decomposed into calcium oxide, then calcium oxide reacts with silicon dioxide to generate calcium silicate, and mixed sand is obtained. Subsequently, the mixed sand is compounded with magnesium oxide sand and boron nitride through dry ball milling, then high-temperature smelting is performed, and magnesium oxide and aluminum oxide react to generate magnesium aluminate spinel. The sand powder material disclosed by the invention has good fire resistance and mechanical strength, can be used for preparing foundry sand, building materials and stones, and endows products with waterproof, fireproof, anti-corrosion and wear-resistant effects.