344results about How to "Improves Structural Integrity" patented technology

The invention provides a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. The silicon-carbon negative electrode material comprises a porous carbon substrate, nano silicon deposited on the surface and in pores of the porous carbon substrate, and a conductive polymer layer coated on the surface of the nano silicon, the porous carbon matrix is formed by taking zinc gluconate as a carbon source through high-temperature pyrolysis and carbonization. According to the silicon-carbon negative electrode material, the preparation method thereof and the lithium ion battery provided by the invention, the silicon-carbon negative electrode material has high specific surface area, excellent conductivity and stable cycle performance, and shows excellent cycle stability and relatively high reversible capacity in the charge-discharge process when being used for the lithium ion battery; the energy density and the cycle life of the lithium ion battery are effectively improved, a new technical approach is provided for preparation of the silicon negative electrode material of the lithium ion battery, and the preparation method has a wide application prospect.

The invention discloses a preparation method and application for preparing a cobalt-doped manganese dioxide material by taking Co3 [Co (CN) 6] 2 as a hard template, and belongs to the technical field of electrode material preparation. The preparation method comprises the following steps: firstly, preparing a Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material through a liquid phase coprecipitation reaction method; and then preparing the cobalt-doped manganese dioxide material with a loose porous structure by taking the Co3 [Co (CN) 6] 2 type Prussian blue nano cubic material as a hard template and potassium permanganate as a reaction raw material and adopting a hydrothermal synthesis method, specifically, forming a submicron cube with the size of 200-700nm by combining nanosheets with the thickness of about 10-20nm, and preparing the cobalt-doped manganese dioxide material with the loose porous structure by adopting a hydrothermal synthesis method. And an optimization strategy of Co atom doping of manganese dioxide and nanosheet morphology control is synchronously completed. When the material is used as an electrode material, the conductivity of the manganese dioxide electrode material is greatly improved, the capacity of an aqueous zinc ion battery is improved, and the material has excellent charge-discharge cycle stability.

The invention provides a preparation method of a triazine / heptazine homojunction structure carbon-doped carbon nitride photocatalyst, which comprises the following specific steps: (1) placing mixed powder of melamine and 2, 4, 6-triaminopyrimidine in air, heating to 300-500 DEG C, and calcining for 2-6 hours to form a mixture of carbon-doped melamine and oligomer thereof; (2) placing the mixture obtained in the step (1) in water at 60-70 DEG C, performing ultrasonic dispersion, then slowly cooling to room temperature, oscillating for 12-36 hours, removing moisture through rotary evaporation, and further drying to obtain a solid supramolecular precursor; and (3) fully mixing the solid supramolecular precursor obtained in the step (2) with molten salt, calcining at 500-600 DEG C for 2-6 hours, cooling, fully washing with deionized water, removing mixed salt, separating solid residues, and drying to obtain the triazine / heptazine homojunction structure carbon-doped carbon nitride photocatalyst THCNx-t. The prepared carbon-doped carbon nitride photocatalyst is uniform in homojunction distribution, and has the characteristics of excellent photochemical properties, high photon-generated carrier separation efficiency and excellent photocatalytic benzyl alcohol selective oxidation performance.

The invention relates to an electrode material for lithium extraction, a preparation method of the electrode material, a lithium extraction electrode and a lithium extraction system, belongs to the field of salt lake lithium extraction, and solves at least one of the problems of fast capacity fading, relatively low overall lithium extraction efficiency and short service life of a lithium extraction electrode for an alkaline solution in the prior art. A preparation method of an electrode material for lithium extraction comprises the following steps: mixing an electrode active material with a rare earth salt solution, and forming a phosphate rare earth layer on the surface of the electrode active material in an in-situ coating manner; the electrode active material comprises lithium iron phosphate and a doped derivative thereof. When the preparation method, the obtained electrode material, the lithium extraction electrode and the lithium extraction system are applied to lithium extraction of salt lake brine, especially alkaline brine, at least one of the cycle performance, the lithium extraction efficiency and the service life is remarkably improved.

The invention provides a nano-modified composite gel foam inhibitor for inhibiting spontaneous combustion of coal and a preparation method of the nano-modified composite gel foam inhibitor, and relates to the technical field of preparation of composite inhibitors. The nanometer modified composite gel foam stopping agent is prepared from six components including sodium polyacrylate serving as a gelling agent, konjac glucomannan serving as a cross-linking agent, lauryl sodium sulfate serving as a foaming agent, xanthan gum serving as a foam stabilizer, nanometer silicon dioxide particles and modified antioxidant powder, the optimal proportion of the gelling agent is 2.5 wt%, the optimal proportion of the cross-linking agent is 0.3 wt%, the optimal proportion of the foaming agent is 0.3 wt%, and the optimal proportion of the modified antioxidant powder is 0.3 wt%. The optimal proportion of the foam stabilizer is 0.4 wt%, the optimal proportion of the nano SiO2 particles is 4 wt%, and the optimal proportion of the modified antioxidant is 2 wt%. Different components endow the nano SiO2 modified composite gel foam with different physical and chemical structural characteristics and coal spontaneous combustion prevention performance characteristics, and by adding the nano SiO2 particles and the bentonite modified tert-butylhydroquinone antioxidant, the overall stability and inhibition efficiency of the gel foam are improved.

The invention discloses a graphene-coated hard carbon negative electrode material and a preparation method thereof, and belongs to the technical field of hard carbon negative electrode materials. The preparation method of the graphene-coated hard carbon negative electrode material comprises the following steps: carrying out pretreatment and three-step soaking on coconut shells, carrying out biomass carbonization, mixing with a microbial suspension, and adsorbing to obtain a microbial adsorption type hard carbon material; and then carrying out surface treatment, chemical vapor deposition, impregnation, secondary chemical vapor deposition and annealing treatment on the microbial adsorption type hard carbon material to obtain the graphene coated hard carbon negative electrode material. The negative electrode material prepared by the method is high in first discharge capacity, high in first coulombic efficiency and good in cycle performance.

The embodiment of the invention discloses a low-illumination image enhancement method and device based on an improved normalized stream. The method comprises the following steps: acquiring a low-illumination image to be enhanced; performing normalization processing on the to-be-enhanced low-illumination image to obtain a normalized spectrum; performing edge extraction processing on the normalized spectrum to obtain an edge spectrum; performing feature fusion on the to-be-enhanced low-illumination image, the normalized spectrum and the edge spectrum to obtain a feature fusion image; performing feature extraction on the feature fusion image by adopting a feature extraction module to obtain a feature extraction image; performing feature mapping on the feature extraction image by adopting a feature mapping module to obtain a feature mapping image; and inputting the feature mapping image into the normalized stream reversible network, and outputting a normal illumination image. By enhancing the low-illumination image through the method, the enhancement effect can be improved.

The invention relates to a preparation method of a dry-process thick pole piece, which specifically comprises the following steps: stirring and mixing active material powder, a binder and a conductive agent under the condition that the temperature is controlled to be less than or equal to 18 DEG C to obtain a premix; the obtained premix is subjected to rapid shearing, the temperature is increased to be smaller than or equal to 180 DEG C, and fiberized powder is obtained after the specified temperature is reached; carrying out one-time double-roller hot pressing on powder obtained after fibration to continuously form a film, continuously passing the formed film through double rollers, carrying out hot pressing and thinning, and then rolling to obtain a dry-method electrode film; the obtained dry-method electrode diaphragm and a current collector are subjected to continuous double-face covering through double-roller hot pressing, and a dry-method electrode thick electrode roll is obtained after rolling; the method has the advantages that effective transmission of lithium ions and electrons in the electrode is promoted, and the thick and compact electrode with uniform binder distribution is prepared.

The invention belongs to the technical field of biological medicines, and particularly relates to schisandra chinensis exosome-like vesicles and application thereof in preparation of anti-depression products. The schisandra chinensis exosome-like nano-vesicles are prepared by a method of combining differential centrifugation with ultra-high-speed centrifugation. The prepared exosome-like nano vesicles derived from schisandra chinensis can be taken in by nerve microglial cells, and the inflammatory response induced by LPS is inhibited; meanwhile, the LPS-induced mouse depression-like behavior can be improved, and the pathological injury of the hippocampus can be relieved. The invention establishes the preparation method of the schisandra chinensis exosome-like nano-vesicle, and verifies that the schisandra chinensis exosome-like nano-vesicle has an anti-depression effect, so that the schisandra chinensis exosome-like nano-vesicle has a relatively good development and utilization prospect.

The invention discloses a high-strength thermoplastic composite pipeline with a metal armored reinforcing layer, belongs to the field of development of clean energy such as natural gas and hydrogen, and is suitable for conveying the clean energy such as natural gas and hydrogen. The pipeline sequentially comprises a lining layer, a reinforcing layer, an anti-abrasion layer, a heat preservation layer, a protection layer, an auxiliary layer, a metal armoring layer, an anti-abrasion layer and a metal armoring reinforcing layer from inside to outside. The lining layer is made of a polytetrafluoroethylene material, the reinforcing layer is formed by spirally winding a high-strength carbon fiber material, the anti-abrasion layer is made of a polyethylene material, the heat preservation layer is made of an aerogel material, and the protection layer is made of a high-density polyethylene material. The two metal armor layers are buckled and connected in a staggered mode through C-shaped interlocking components which are spirally wound in the reverse direction, and the spiral winding angle is 30 degrees. The C-shaped interlocking structure is composed of an outer lock catch and an inner lock catch. Through the multi-layer structural design, the tensile strength, the impact resistance and the torsional strength of the thermoplastic composite pipeline can be effectively improved, the service life of the pipeline is prolonged, and the safety and the stability of the pipeline under complex working conditions are enhanced.

The utility model relates to the technical field of semiconductor chip processing equipment, in particular to a lead frame storage rack which comprises a rack body and an elastic pressing mechanism, the rack body is provided with a containing cavity for limiting the lead frames to be stacked in order, and the elastic pressing mechanism is installed in the containing cavity and used for pressing the tops of the lead frames stacked on the elastic pressing mechanism. The lead frame has the effect of improving the structural integrity of the lead frame during storage and transportation.

The invention provides a pedestrian warning device for a vehicle, and belongs to the technical field of vehicle parts, the pedestrian warning device comprises a shell assembly, the shell assembly comprises an upper shell and a lower shell, the surface of the upper shell is provided with a plurality of openings, and the lower shell is internally provided with a containing cavity; the edge of the upper shell protrudes towards the periphery to form an upper flange part, the edge of the lower shell protrudes towards the periphery to form a lower flange part, and the upper flange part and the lower flange part are in butt joint and are fixedly connected through a plurality of first screws; the loudspeaker is fixedly installed in the upper shell and divides the space in the upper shell into a first cavity and a second cavity, the first cavity and the second cavity are isolated, the opening is communicated with the first cavity, and the second cavity is communicated with the containing cavity. The device has the advantages that the upper shell and the lower shell are combined, sealing connection is conducted through the flange part, the whole device is more compact, good waterproof and dustproof performance is provided, internal electronic elements are protected against the influence of the external environment, and the service life is prolonged.

The invention relates to a hydrated borate micromolecule with a boron-nitrogen coordination bond, a derivative resin material and a preparation method of the hydrated borate micromolecule. The preparation method comprises the following steps: S1, synthesizing boron-nitrogen coordination micromolecules: dissolving and reacting boric acid, a derivative thereof and a polyfunctional group amine compound at room temperature through a solution reaction to obtain the boron-nitrogen coordination micromolecules; the borate micromolecule NCBW-X with intramolecular boron and nitrogen coordination is formed; s2, the NCBW-X micromolecule can be used for curing epoxy resin and synthesizing materials such as phenolic resin through end-NH2 and end-OH on two sides, the NCBW-X improves the mechanical property of each system through a rigid eight-membered ring, boron-nitrogen coordination of the NCBW-X can generate hydration, the environmental endurance is improved on the premise of retaining the original dynamic nature of boric acid ester of the NCBW-X, and the service life of the NCBW-X micromolecule is prolonged. Meanwhile, due to the dynamic reversibility of the NCBW-X, the NCBW-X is used for curing epoxy resin, and materials such as phenolic resin and the like are improved to a certain extent in the aspects of self-repairing and recycling.

The invention relates to the technical field of scale inhibitors, and particularly discloses a preparation method of a corrosion and scale inhibitor, which comprises the following steps: dissolving modified polyaspartic acid in hydrogenated diesel oil, adding an antioxidant, and uniformly mixing to obtain a solution A; dissolving hydrolytic polymaleic anhydride in hydrogenated diesel oil to obtain a solution B; the preparation method comprises the following steps: uniformly mixing an imidazoline oleoyl polyamine corrosion inhibitor and 2-amino-5-methyl-4-phenylthiazole to obtain a mixture C; the preparation method comprises the following steps: adding sodium dodecyl benzene sulfonate into hydrogenated diesel oil, then adding nano titanium dioxide and nano zinc oxide, and uniformly mixing to obtain dispersion liquid D; dissolving a dispersing agent in the hydrogenated diesel oil to obtain a solution E; and mixing the solution A and the solution B in a reactor, heating for reaction, adding the mixture C, heating for reaction, cooling, adding the solution E, adding the dispersion liquid D, heating for reaction, cooling, carrying out solid-liquid separation, and distilling to obtain the product. The corrosion and scale inhibitor prepared in the invention has good temperature resistance.

The invention relates to a preparation method of a modified waste concrete recycled aggregate, which comprises the following steps: crushing waste concrete, screening the crushed waste concrete with a proper particle size to serve as a raw material of the recycled aggregate, washing with a shaking sieve to remove part of edges and corners about to fall off, and carrying out gelation reaction by using modified solutions such as nano silicon dioxide and water-soluble silicate to obtain the modified waste concrete recycled aggregate. According to the invention, fine pores on the surfaces of concrete particles are blocked and repaired, so that the structure is complete and compact, the mechanical strength of the aggregate is enhanced, the porosity and the water absorption rate are reduced, and the water absorption and the mechanical strength are further reduced through phenolic resin coating. The modified waste concrete recycled aggregate is mixed with cement, zeolite powder and the like, the mixture is pressed into a blank, and the artificial stone with excellent mechanical properties and low water absorption is obtained after carbonization curing. The method provided by the invention has good application prospects and environmental protection significance.

The invention relates to the technical field of solar-blind ultraviolet detector materials, and particularly discloses a diamond / gallium oxide heterojunction and application of the diamond / gallium oxide heterojunction to a solar-blind ultraviolet detector, and the diamond / gallium oxide heterojunction comprises a single crystal diamond layer and a Zr-doped epsilon-Ga2O3 layer located on the single crystal diamond layer; the single crystal diamond layer is made of (100) oriented single crystal diamond, and the surface roughness RMS of the single crystal diamond is 2-6 nm; the Zr-doped epsilon-Ga2O3 layer is Zr-doped epsilon-Ga2O3 which is grown on the surface of the monocrystal diamond in a heteroepitaxial manner by adopting a pulse laser deposition method; zr-doped epsilon-Ga2O3 grows on the surface of the monocrystal diamond along the (001) direction; and the Zr doped epsilon-Ga2O3 is of a columnar crystal structure. The heterojunction provided by the invention realizes excellent photoelectric detection performance, solves the problem of poor selectivity of a traditional solar blind ultraviolet detector, and has wide application value.

The invention relates to the technical field of food packaging, and discloses a flour packaging bag based on single material compositing, which comprises a middle-sealed folding bag and an eight-edge-sealed folding packaging bag, and comprises a first bag body and a first bag side applied to the middle-sealed folding bag, one side edge of the bag body is connected end to end and then is sealed to form a middle sealing part, and the other side edge of the bag body is sealed to form an eight-edge-sealed folding packaging bag. The first bag body and one end face of the bag side are connected and then are subjected to edge sealing to form a transverse sealing part, the position, located on the transverse sealing part, of the first bag body is coated with an adhesive tape, and after middle sealing is completed, the middle sealing part is attached to the adhesive tape. By adopting the unstretched PE film composite design, the tensile strength, the heat sealing performance and the tear resistance of the packaging bag are remarkably improved, the heat sealing temperature is as low as 120 DEG C or below, and the bag breaking risk is reduced; the method is suitable for complex bag shape processing; through the environment-friendly solvent-free adhesive and the dry type compound technology, the production efficiency is improved, the cost is reduced, meanwhile, efficient recycling and environment-friendly performance are achieved, and the packaging requirement of heavy objects is met.

The utility model discloses a lithium battery pole piece thickness control device which comprises a base, the upper surface of the base is fixedly connected with a fixing frame, the rear surface of the fixing frame is fixedly connected with a driving motor, the output end of the driving motor is fixedly connected with a driving roller, and the inner surface of the fixing frame is slidably connected with an adjusting block. An extrusion roller is rotatably connected to the inner surface of the adjusting block, a connecting rod is fixedly connected to the upper surface of the adjusting block, a first adjusting frame is fixedly connected to the upper surface of the connecting rod, and through the arrangement of the two guide frames, a pole piece to be compacted can be conveniently guided and accurately guided to the center position of the extrusion roller, and it is guaranteed that the position of the pole piece is accurate; the compaction quality of the pole piece is improved, the surface and structural integrity of the pole piece is protected, the motor drives the two-way screw rod to rotate so as to drive the supporting block to move to adjust the distance between the guide frames, the device can be suitable for guiding the pole pieces of different specifications, and the applicability of the device is improved.

The invention relates to an integrally-formed hollow-structure Pick racket and a preparation method thereof, and belongs to the technical field of Pick rackets. The hollow cavity shell is filled with the foam core layer, an opening is formed in the hollow cavity shell, and the foam core layer is obtained by conducting heat treatment foaming on a foaming raw material; the method further comprises the following steps that an integrally-formed hollow cavity shell with an opening is obtained through a blow molding technology; the hollow cavity shell is filled with foaming raw materials; the filled hollow cavity shell is subjected to heat treatment, so that the foaming raw materials are foamed, expanded and fused in the shell, and a foam core layer tightly combined with the shell is formed; according to the Pick racket, an adhesive interface existing in a traditional spliced racket is structurally and thoroughly eliminated, the risk of adhesive failure and layering after long-term use or damp is fundamentally avoided, the structural integrity of the racket is greatly improved, and the durable life of the racket is greatly prolonged.

The invention provides a preparation method of a carbon-doped carbon nitride material, which is characterized by comprising the following specific steps: (1) prepolymerization: mixing melamine and 2, 4, 6-triaminopyrimidine powder according to a certain proportion, heating to 400-450 DEG C in a protective gas atmosphere, and calcining to form prepolymer carbon-doped melem; (2) supramolecular modification: taking 0.5 g of carbon-doped melem obtained in the step (1), adding the carbon-doped melem into 25 mL of a hydrochloric acid aqueous solution with a certain concentration, carrying out ultrasonic oscillation dispersion, placing the mixture in a fuming cupboard to naturally evaporate water and excessive hydrochloric acid, and further drying and grinding the mixture to obtain a hydrogen-halogen bond connected carbon-doped heptazine supramolecular precursor; and (3) preparing carbon nitride through high-temperature calcination: calcining the hydrogen-halogen bond connected carbon-doped heptazine supermolecule precursor obtained in the step (2) at 500-600 DEG C for 2-6 hours, cooling, crushing and grinding to obtain the carbon-doped carbon nitride photocatalytic material.According to the method provided by the invention, a prepolymer is prepared firstly, has relatively high thermal stability and a heptazine skeleton structure which is the same as g-C3N4, and is used for preparing the carbon nitride photocatalytic material. The preparation method comprises the following steps: firstly, carrying out supermolecule modification through hydrochloric acid, and finally, carrying out high-temperature calcination, so that rich pore structures can be obtained, the absorption capacity of the material to sunlight and the adsorption capacity of the material to reactant molecules can be improved, the framework structure integrity of the material can also be improved, an unblocked transmission channel is provided for photon-generated carriers, and the photocatalytic efficiency is improved.

The present invention discloses a silicon-based negative electrode active material and a lithium battery silicon negative electrode sheet, wherein the silicon-based negative electrode active material uses nano silicon as a substrate, and an aminosilane coupling agent and a sulfonated polyimide are sequentially coated on the outside of the substrate. The present invention proposes a silicon-based negative electrode active material and a lithium battery silicon negative electrode sheet, which effectively suppress the expansion and pulverization effect of nano silicon by sequentially coating the surface of nano silicon with an aminosilane coupling agent and a sulfonated polyimide, so that the silicon-based negative electrode active material has both a high first coulomb efficiency and good cycle stability.

This utility model relates to the field of lightweight golf cart frames with localized reinforcement, and discloses a lightweight golf cart frame with localized reinforcement, including a chassis assembly. An auxiliary assembly is installed at the front end of the chassis assembly, and symmetrically distributed drive assemblies are installed at the bottom of the chassis assembly. A frame assembly is installed on top of the chassis assembly, and an angle adjustment assembly is movably sleeved on top of the frame assembly. The frame includes a plate, which helps reduce the weight of the frame plate and improves the vehicle's handling performance. Its strength is far higher than that of traditional metal materials; for example, its tensile strength can reach several times that of steel. It can withstand larger loads, ensuring the structural integrity of the frame under various working conditions. It is not easily corroded by acids, alkalis, salts, and other corrosive substances, and can maintain stable performance for a long time under harsh environmental conditions, extending the service life of the frame and reducing maintenance costs. The internal perforation design further reduces the overall weight of the device.

The application discloses a method for preparing a carbon fixation material from magnesium slag, and the carbon fixation material, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: mixing magnesium slag and calcareous raw materials to obtain a compound material, wherein the molar ratio of calcium to silicon in the compound material is (2.3-2.7):1; forming the compound material into a green body; preheating the green body at 200-600 DEG C, calcining the green body by increasing the temperature to 1150-1450 DEG C, and cooling the green body by decreasing the temperature to 400-600 DEG C, thereby obtaining the carbon fixation material. The method can reduce the content of beta-C2S in the magnesium slag, increase the content of gamma-C2S, effectively stabilize heavy metal ions, and reduce the generation of volatile gases such as ammonia, thereby significantly improving the long-term stability and environmental safety of the material on the basis of ensuring the carbonation reaction activity.

The invention relates to the field of electron tubes, and discloses a low-evaporation three-layer film cathode assembly for a space traveling wave tube, which comprises a tungsten substrate positioned on a substrate; the first layer of rhenium film and the rhenium film cover the tungsten substrate; the carbon nanotube composite material layer is deposited on the rhenium film; the second osmium-tungsten film is deposited on the carbon nanotube layer; the third osmium-ruthenium film is deposited on the osmium-tungsten film; wherein the thicknesses of the rhenium film, the carbon nanotube layer, the osmium-tungsten film and the osmium-ruthenium film are respectively controlled to be 0.5-2 mu m, 10-50 nm, 50-200 nm and 20-100 nm, and the carbon nanotube composite material layer is obtained by growing on the rhenium film through chemical vapor deposition. By adopting the osmium-tungsten and osmium-ruthenium films with high crystallinity and the optimized carbon nanotube composite material layer, the electron emission efficiency of the cathode assembly is remarkably improved, so that the energy required by electron emission is reduced, and the electron output quantity under the same working condition is increased.

The invention discloses a slag cement geotextile bag sand construction method which comprises a plurality of geotextile bags filled with sand, buckles are arranged on the geotextile bags, and every two adjacent geotextile bags are connected together through the buckles to form a stacked geotextile bag structure. Each buckle comprises a connecting belt and a connecting buckle, the connecting buckles are connected to the geotechnical bags through the connecting belts, and every two adjacent geotechnical bags are connected together in a buckled mode through the two connecting buckles. The invention further discloses a slag cement geotextile bag sand construction method. The buckles are arranged on the geotechnical bags, every two adjacent geotechnical bags are connected together in a buckled mode, an integrated locking structure is formed, the connection integrity is greatly improved, the overall compression resistance is improved, and good structural integrity and compression resistance can be kept when encountering extra-large flood or disasters.

The invention relates to the technical field of sodium-ion batteries, in particular to a sodium-ion battery positive electrode material and a preparation method thereof. The sodium ion battery positive electrode material is Ti and Cl doped Na4VMn (PO4) 3, and the molar ratio of Na to Ti in the sodium ion battery positive electrode material is 4: (0.05-0.1); the molar ratio of Na to Cl is 4: (0.05-0.1). According to the sodium-ion battery positive electrode material provided by the invention, a titanium element and chlorine element synergistic co-doping mode is adopted, so that the ginger-Taylor distortion caused by manganese ions in the charging and discharging process can be inhibited, the lattice stress can be reduced, and the stability of the material structure can be enhanced; meanwhile, the dissolution of manganese under a high-rate cycle condition can be inhibited, and the loss of active substances and the side reaction of electrolyte are reduced, so that the electrochemical stability and the structural integrity of the electrode material are improved, and the sodium ion battery containing the positive electrode material has relatively high specific capacity, excellent rate capability and cycle stability.

The embodiment of the application discloses a low-illumination image enhancement method and device based on an improved normalized flow, which comprises the following steps: acquiring a low-illumination image to be enhanced; performing normalization processing on the low-illumination image to be enhanced to obtain a normalized spectrum; performing edge extraction processing on the normalized spectrum to obtain an edge spectrum; performing feature fusion on the low-illumination image to be enhanced, the normalized spectrum and the edge spectrum to obtain a feature fusion image; performing feature extraction on the feature fusion image by using a feature extraction module to obtain a feature extraction image; performing feature mapping on the feature extraction image by using a feature mapping module to obtain a feature mapping image; and inputting the feature mapping image into a normalized flow reversible network to output a normal-illumination image. The low-illumination image is enhanced by the method, and the enhancement effect can be improved.

The application belongs to the field of medical materials, and particularly relates to a metal core enhanced double-barrier piezoelectric nano system and a preparation method and application thereof. The preparation method comprises the following steps: first, a core-shell structure of'metal@mesoporous titanium dioxide@mesoporous barium titanate' is prepared through a step-by-step reaction, and then the target nanoparticles are obtained through lipid wrapping. The system innovatively constructs a double-barrier structure, can self-trigger active oxygen under a physiological pressure of 4 mmHg, realizes endogenous pressure self-driven treatment of malignant ascites, has the advantages of low pressure, high catalytic efficiency, long-term structural stability and good biocompatibility, solves the problems that existing treatment methods are highly invasive and depend on exogenous stimulation, and provides a new safe and efficient technical scheme for the treatment of malignant ascites.

The invention relates to the technical field of hand plate molds, in particular to a new energy automobile speed reducer box hand plate mold and a using method thereof.The new energy automobile speed reducer box hand plate mold mainly comprises a first supporting frame, a second supporting frame fixedly installed on the top face of the first supporting frame, an ejection mechanism arranged above the first supporting frame, and a limiting mechanism arranged below the second supporting frame; the lubricating mechanism is arranged above the first supporting frame. A second air cylinder is started to drive a connecting plate to move upwards, meanwhile, a hand plate piece is ejected out of the lower mold, the connecting plate drives a wedge-shaped strip to move upwards, the wedge-shaped strip pushes an L-shaped plate to move horizontally, the L-shaped plate drives a moving plate and a connecting column to move, the connecting column drives a connecting frame, a rotating shaft and a roller to move, and when the roller makes contact with the hand plate piece, the moving plate extrudes a second elastic piece; and under the elastic action of the second elastic piece, the roller extrudes and limits the side wall of the hand plate, so that the outer wall of the hand plate is not prone to skewing and rubbing the edge of the mold, and the attractiveness and the service life of the surface of the hand plate are guaranteed.

The application relates to the technical field of battery materials. Disclosed are a lithium nickel-manganese acid positive electrode material, a preparation method thereof, a positive electrode and a battery. The lithium nickel-manganese acid positive electrode material comprises a base material and a first coating layer and a second coating layer successively coated on the surface of the base material; the chemical general formula of the base material is Li(Li a Ni b Mn c Fe d Sb e )O 4‑x , wherein a+b+c+d+e=2, 0<=x<=0.2, 0<=a<=0.1, 0.4<=b<=0.5, 1<=c<=1.5, 0.1<=d+e<=0.4; the first coating layer comprises NbTi(PO4)3, and the mass ratio of the first coating layer to the base material is 0.1-5:100; the second coating layer comprises a carbon material, and the mass ratio of the second coating layer to the base material is 0.1-5:100. The lithium nickel-manganese acid positive electrode material provided by the embodiment of the application has excellent electrochemical performance.