429results about How to "Reduce formation" patented technology

The invention relates to an engineering bacterium of high-yield ornamental blue as well as a construction method and application of the engineering bacterium, and belongs to the technical field of natural dye synthesis by a biological method. The engineering bacterium capable of highly producing the ornamental blue, disclosed by the invention, expresses icd, bpsA, glnAY405F and gd hA; acnR, yggB, glsK, aceA and ldh are knocked out from the engineering bacteria. According to the application, yggB and aceA genes are knocked out, site-directed mutagenesis (Y405F) is carried out on a glnA gene, a glsK gene is replaced by a glnAY405F gene, an acnR gene is replaced by an icd gene, an ldh gene is replaced by a gdhA gene, and a bpsA gene is integrated, so that the formation of by-products such as lactate and succinic acid in a blue-viewing synthesis process can be blocked; the flow direction of a passage from citric acid to isocitric acid to alpha-ketoglutaric acid to glutamic acid to glutamine is improved, so that the concentration of glutamine in cells is improved, and the yield of the ornamental blue is improved.

The invention relates to the technical field of microorganisms, in particular to a viable bacterium preparation of a lactobacillus paracasei strain as well as a preparation method and application of the viable bacterium preparation. The viable bacterium preparation comprises a lactobacillus paracasei strain and auxiliary materials, and the preservation number of the lactobacillus paracasei strain is CGMCC (China General Microbiological Culture Collection Center) No.27974. The viable bacterium preparation can inhibit the growth of streptococcus mutans, reduce the formation of a dental plaque biofilm caused by the streptococcus mutans, reduce the content of a mature dental plaque biofilm, inhibit the level of water-insoluble exopolysaccharides generated by the streptococcus mutans, reduce the expression quantity of cariogenic genes gtfB, gtfC, gtfD, ftf and LuxS of the streptococcus mutans, improve the cariogenic activity of the streptococcus mutans and improve the cariogenic activity of the streptococcus mutans. The adhesion rate of streptococcus mutans on a hydroxyapatite tooth model is reduced, and a beneficial in-vitro probiotic function is achieved.

The invention discloses a method for improving the high-cycle fatigue performance of a Ti6Al4V titanium alloy, and belongs to the technical field of metal material processing, and the method comprises the following steps: S1, determining shot peening strengthening parameters based on material performance parameters and related standards; according to the method, high-amplitude residual compressive stress is introduced through shot peening strengthening, the stress state of the surface and the depth direction of the material is changed, accordingly, crack extension can be restrained, the fatigue life is prolonged, in addition, a plastic deformation layer is induced to be generated under the surface depth in the shot peening process, the microstructure of the material is improved, and the anti-fatigue performance of the material is improved; through femtosecond laser shock, surface defects can be effectively removed, the surface compactness can be improved, microcracks can be reduced, and a refined grain structure can be generated, so that the strength and toughness of the material are further enhanced, the high-cycle fatigue performance of the material is further improved, the two are combined, the residual stress state is optimized, and the surface integrity is improved. The fatigue performance of the Ti6Al4V titanium alloy is remarkably improved.

The invention provides a system for preparing a single-walled carbon nanotube based on a pulsed plasma arc, which can improve the yield of the single-walled carbon nanotube. Two electrode module groups are arranged in an electric arc reaction cavity and are respectively used as an anode and a cathode, and a pulse power supply drives a motor module group to generate a pulse plasma electric arc; a pulse plasma arc is used as a heat source, a mixed solution of a catalyst and a catalyst auxiliary agent is atomized and then is fed into an arc reaction cavity by using carrier gas to react with a gaseous carbon source which is independently fed, and a high-purity single-walled carbon nanotube is grown on the surface of the fine catalyst through plasma flow between a cathode and an anode and a cracked carbon source, so that the high-purity single-walled carbon nanotube is obtained. And a produced product is obtained in a collection chamber at the tail end of the system. Meanwhile, the invention also discloses a method for preparing the single-walled carbon nanotube based on the pulse plasma arc.

The invention discloses an aluminum alloy wheel multi-pouring-gate casting mold, method and equipment, the aluminum alloy wheel multi-pouring-gate casting mold comprises an upper mold plate and a bottom plate, an upper mold is arranged on the upper mold plate, an outer core pulling block is arranged on the outer side of the upper mold, a lower mold base is arranged on the bottom plate, a lower mold is arranged on the lower mold base, and the upper mold, the lower mold and the outer core pulling block jointly form a casting blank cavity. A transverse pouring gate matched with a product is arranged on the lower die base, a plurality of inner pouring gates communicated with a casting blank cavity are arranged on the inner side of the transverse pouring gate, a vertical pouring gate is arranged between the parting surfaces of the outer core pulling block and communicated with the transverse pouring gate and the casting blank cavity, a side pouring gate communicated to the transverse pouring gate is arranged on the outer side of the bottom plate, and the side pouring gate is communicated with the inner pouring gate. According to the structure, the transverse pouring gate, the inner pouring gate and the vertical pouring gate are used in cooperation, so that the feeding distance is greatly shortened, the feeding effect of all parts of a casting is improved, and then the casting quality is improved.

The invention discloses a method for evaluating the possibility that complementary regions among primers in a candidate primer group trigger generation of dimers, complementary subregions in primer sequences are HBJ regions, the possibility that the HBJ regions trigger the dimers is represented by a function LHSm of a mathematical model (1), the higher the value of the LHSm is, the higher the possibility that the dimers are triggered is, and the lower the value of the LHSm is, the higher the possibility that the dimers are triggered is. According to the evaluation and optimization method disclosed by the invention, the formation of primer dimers can be reduced to the maximum extent.

The invention relates to the technical field of high-chromium and high-molybdenum ferritic stainless steel, in particular to a preparation method of a high-chromium and high-molybdenum aluminum-containing ferritic stainless steel hot / cold-rolled plate. In order to solve the problems that in the prior art, in order to avoid brittle phase precipitation, the hot rolling and finish rolling temperature is high, and aluminum oxide particles and large-size carbon / nitride particles are likely to be formed, the novel preparation method of the high-chromium and high-molybdenum aluminum-containing ferrite stainless steel hot / cold-rolled sheet is provided. Comprising the following steps of smelting, casting, forging, hot rolling, annealing, acid pickling, cold rolling and recrystallization annealing, and through the forging process in the preparation method, large-size TiN and Ti / Nb (C, N) particles can be prevented from being formed; through the warm rolling process, a nanoscale Laves phase is separated out, meanwhile, a large deformation structure is formed, a large number of deformation microstructures such as shear bands and deformation bands are obtained, the problem of grain coarsening is solved, and the plasticity, toughness and corrosion resistance of the material are improved.

The invention relates to the technical field of welding, in particular to a lead-free solder composition and a preparation method thereof. The composition comprises brazing filler metal and a brazing flux, wherein the brazing filler metal comprises 55 to 65 parts of copper, 30 to 40 parts of zinc, 0.5 to 1 part of silver, 0.1 to 1 part of tin, 0.1 to 0.5 part of nickel, 0.02 to 0.15 part of lanthanum, 0.03 to 0.15 part of cerium and 0.05 to 0.2 part of indium; the brazing flux comprises 18-22 parts of borax, 13-17 parts of boric acid, 25-32 parts of a potassium fluoride and potassium fluoborate compound, 3-5 parts of calcium fluoride, 12-16 parts of aluminum oxide and 8-11 parts of magnesium oxide. The lead-free solder composition does not contain toxic lead elements, pollution to the environment and the ecological system is little, the wettability, corrosion resistance, strength, stability and the like of the lead-free solder composition are improved, and the welding quality is comprehensively improved. According to the preparation method, uniform distribution and accurate control of the brazing filler metal and the brazing flux are guaranteed, stability and consistency of product quality are guaranteed, and the preparation method is easy and convenient to operate and suitable for mass production.

The invention relates to the technical field of daily chemicals, in particular to a white tomato whitening and repairing composition as well as a preparation method and application thereof. The composition comprises the following components in percentage by mass: 68-85% of jojoba oil, 10-25% of squalane and the balance of white tomato extract, wherein the total percentage is 100%. The white tomatoes are rich in colorless carotenoids (such as phytoene and tetrahydrolycopene), and have excellent antioxidant and whitening capabilities: melanin formation is inhibited, and the colorless carotenoids can inhibit tyrosinase activity, reduce melanin generation and fundamentally whiten the skin. Pigmentation caused by ultraviolet rays can be relieved through the anti-oxidation effect, and the color spots are prevented and faded. The skin color can be brightened after continuous use, so that the skin presents natural luster.

The invention provides a culture pond water flow adjusting method and device, electronic equipment and a storage medium, and is applied to the technical field of recirculating aquaculture. The environment temperature of a culture pond and the variable quantity of the environment temperature are obtained, and when the environment temperature exceeds a first preset temperature interval and the variable quantity is small, the water flow is adjusted; the current water flow velocity is obtained to evaluate whether the water flow needs to be adjusted to adapt to temperature change and keep the stability of water quality and fish growth environment; through reference of historical data, an adjustment strategy of the water flow velocity can be formulated more scientifically, and unnecessary pressure on fishes due to blind adjustment is avoided. The water flow velocity is limited to be within a safe range, impact on fishes due to too fast change of the water flow velocity can be avoided, and comfortable and healthy growth of the fishes is ensured. Therefore, the method has the beneficial effects that the formation of a stagnant water area can be prevented, and the impact on fishes caused by too fast change of the water flow velocity can be avoided.

The invention relates to the technical field of welding materials, in particular to a high-efficiency deposited nickel-based welding wire capable of preventing welding cracks based on phase regulation and application of the high-efficiency deposited nickel-based welding wire, and the nickel-based welding wire comprises the following chemical components in percentage by weight: less than or equal to 0.03% of C, 0.10-0.20% of Si, 2.9-3.2% of Mn, and 1t of P; 0.005%, S: lt; 0.003% of Cu, 19.7-20.5% of Cr, less than or equal to 0.04% of Co, and 1t of Cu; the Ni-based alloy comprises the following components in percentage by weight: 0.10% of Ni, 0.3-0.6% of Ti, 0.4-2.0% of Fe, 2.1-2.9% of Nb, less than or equal to 0.3% of Mo, less than or equal to 0.01% of N, less than or equal to 0.005% of O, less than or equal to 0.50% of other impurity elements and the balance of Ni. The specific value of Ti to Nb is controlled to be 0.10-0.22, the specific value of C to Nb + Ti is controlled to be 0.012 or below, appropriate morphology and distribution of (Nb, Ti) C type intergranular precipitates are obtained, precipitation of grain boundary M23C6 is reduced, and the creep resistance and high-temperature deplasticity crack resistance of the material are effectively optimized.

The invention discloses a method for enhancing Candida albicans biofilm resistance of azole drugs by using a zinc ion chelating agent, through the combined action of the zinc ion chelating agent N, N, N ', N'-tetra (2-picolyl) ethylenediamine (TPEN) and fluconazole, the activity of the Candida albicans biofilm can be reduced, and the Candida albicans biofilm can be enhanced. The early-stage adhesion process, the medium-stage yeast-to-hypha conversion process and the late-stage maturation process formed by the candida albicans biological membrane are inhibited, the structure of the candida albicans biological membrane is destroyed, then the high drug resistance of the candida albicans biological membrane to fluconazole is reversed, and the pathogenicity of the fluconazole is reduced; the problems of high drug resistance and sustained infection caused by the formation of a candida albicans biofilm are hopefully solved, and a direction is provided for the treatment of clinical fungal infection and the research and development of drugs.

The invention discloses a food freezing system based on electrode coupling and a multi-stage electric field and a freezing method thereof. The system comprises an electric field generating device (1), a refrigeration house (2), a space plate type discharge electrode (3), a metal frame discharge electrode (4) and the like. According to the freezing method, a discharge electrode is used for being coupled with an electric field, a special'superposed electric field effect 'is generated, the freezing efficiency is remarkably improved, heat conduction inside and on the surface of food can be accelerated, uniform and rapid crystallization of water is promoted, large ice crystals are effectively prevented from being formed, and therefore damage to cell structures is reduced. Compared with a traditional freezing method, the freezing time can be shortened by 15%-30%, and the juice loss rate is reduced by 3%-6%. Due to the synergistic effect of the double electric fields in different stages, the food can be quickly frozen under lower voltage, and the comprehensive energy consumption can be reduced by 15-30% while the safety is ensured. The method is suitable for large-scale food freezing application, and remarkable technical progress and economic benefits can be brought to the food freezing industry.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece and a lithium ion battery, and belongs to the technical field of electrochemistry. The negative electrode active material comprises a composite core material and a coating material, the composite core material comprises a substrate material and a first material, the substrate material is provided with a plurality of pores, and the first material is arranged on the pore walls of the pores of the substrate material; the coating material coats at least part of the outer surface of the composite core material; wherein the nucleation overpotential of lithium on the first material is smaller than the nucleation overpotential of lithium on the coating material, so that lithium ions are more prone to nucleation and deposition on the first material, and formation of lithium dendrites is reduced; the coating material further protects the inner core material and prevents the inner core material from being in direct contact with the electrolyte, so that the probability of side reaction between the metal lithium and the electrolyte / electrolyte is reduced, and the cycle performance is improved.

The invention discloses an ADF protein from phytophthora as well as a coding gene and application thereof. According to the present invention, the PsADF protein provided by the present invention is the protein represented by sequences 2 and 5 in Phytophthora sojae (Phytophthora sojae); the coding gene is shown as a sequence 3 and a sequence 4. Tests prove that the protein provided by the invention plays an important role in the growth and development process of phytophthora sojae, specifically, after the 64-site mutation of the key amino acid functional site of the protein, the sporangium abnormality and zoospore quantity of the phytophthora sojae are reduced, and the pathogenicity is reduced. The protein provided by the invention has very high application value in control of epidemic disease occurrence and epidemic caused by phytophthora, and provides a molecular target for research and development of novel bactericides in the future. The corresponding ADF inhibitors have different degrees of activity on typical plant pathogenic oomycetes such as phytophthora sojae, phytophthora capsici and phytophthora infestans. The protein provided by the invention has great application potential in the aspect of preventing and controlling the crop epidemic diseases caused by phytophthora plant pathogenic oomycetes, and a novel bactericide developed based on the protein as an action target has important practical significance in controlling the occurrence and prevalence of the crop epidemic diseases caused by phytophthora.

The invention discloses a quick self-cleaning fish bucket culture pond which comprises a fish bucket pond, the fish bucket pond comprises a cylindrical bucket body and an inverted-cone-shaped bucket bottom, a sewage discharge pipe is arranged at the bottom of the inverted-cone-shaped bucket bottom, a water discharge pipe is arranged on the lower portion of the cylindrical bucket body, and a plurality of water pushing pipes are arranged on the outer side of the fish bucket pond. The bottom of the water pushing pipe is connected with an external water inlet pipe, a sewage draining siphon device is arranged in the middle of the fish barrel pool, and an opening is formed in the center of the bottom of the inverted-cone-shaped barrel bottom. Through the design of the cylindrical-conical combined working area of the fish bucket culture pond, the water pushing pipe and the pollution discharge siphon device of the fish bucket pond, fish excrement and residual feed can be quickly sucked, discharged and separated from culture water, and conversion of solid organic pollutants into water-soluble pollutants in the water is greatly reduced; meanwhile, a culture area and a pollutant precipitation and solid-liquid separation area generated in culture are combined into a whole, so that the construction space and the construction cost are greatly saved.

The invention relates to the technical field of lead-acid storage batteries, in particular to a preparation method of a rare earth alloy for a lead-acid storage battery, which comprises the following steps: smelting refined lead and rare earth elements in a crucible electric furnace; the heating rate of the crucible electric furnace at each collection moment is adjusted; after smelting is finished, rare earth alloy liquid is obtained, and an intermediate rare earth alloy is prepared through an ingot casting technology; the method comprises the following steps: melting refined lead in a lead melting pot, heating, sequentially adding silver and sodium, stirring, heating again, adding calcium-aluminum alloy, tin and a protective agent, smelting, adding the intermediate rare earth alloy, keeping a heating state, and stirring to obtain the positive grid rare earth alloy. The heating rate in the rare earth alloy smelting process is adjusted, the rare earth element utilization rate is increased, and rare earth alloy elements are evenly distributed.

The invention discloses a composite carrier supported hydrogenation catalyst and application thereof, the composition of the catalyst is Pd-M-Nb2O5-B, and the content of the active component palladium Pd is 0.2-1.5%; the auxiliary agent M is one or two of silver and bismuth, and the molar ratio of the content of the auxiliary agent M to the active component Pd is 1: (0.5-4); nb2O5-B is a composite carrier, and the composite carrier accounts for 97.0-99.5% of the total weight of the catalyst; in the composite carrier Nb2O5-B, the content of Nb2O5 is 8 to 15 percent; b is one or more of TiO2, SiO2 and Al2O3, and the weight ratio of TiO2 to SiO2 to Al2O3 is (1-3): (5-20): 100. The catalyst has excellent water resistance, the complex carrier has stronger acidity compared with common solid acid, the product yield is higher, and the stability of the acetyl n-propanol generated by the reaction of the catalyst can be improved.

The utility model relates to the field of spinning, in particular to a woven fabric traction adjusting device for a warp knitting machine, which comprises a machine shell, a machine frame, a traction device and a control device, and a conveying roller is arranged on the inner side of the machine shell; the anti-deformation mechanism is arranged on the inner side of the machine shell, and the surface of the anti-deformation mechanism penetrates to the exterior of the machine shell; wherein the anti-deformation mechanism comprises an anti-wrinkling assembly arranged on the inner side of the machine shell, and an edge shifting assembly is arranged on the surface of the anti-wrinkling assembly; when the woven fabric is pulled, the central area of the woven fabric can be smoothed under the action of the crease-resistant assembly, the device drives the smoothing plate to be attached to the lower inclined face of the woven fabric by manually adjusting the position of the positioning rod, the pulled woven fabric is supported in an auxiliary mode, wrinkles generated in the pulling process of the woven fabric are smoothed, and the smoothness of the woven fabric is improved. Therefore, wrinkles in the middle area of the woven fabric are reduced in the traction process, and deformation of the woven fabric caused by traction is reduced.

The invention relates to the technical field of microorganisms, in particular to a lactobacillus paracasei strain as well as a fermentation product and application thereof. The preservation number of the lactobacillus paracasei strain is CGMCC (China General Microbiological Culture Collection Center) No.27974. The Lactobacillus paracasei can inhibit the growth of Streptococcus mutans, reduce the formation of a dental plaque biofilm caused by Streptococcus mutans, reduce the content of a mature dental plaque biofilm, inhibit the level of water-insoluble exopolysaccharides generated by Streptococcus mutans, and reduce the expression quantity of cariogenic genes gtfB, gtfC, gtfD, ftf and LuxS of Streptococcus mutans, and can be used for fermentation production of fermented milk. And oat milk and other fermentation products.

The invention discloses a zirconium-nickel dissimilar metal welding method based on active regulation and control of a temperature field. The zirconium-nickel dissimilar metal welding method comprises the following steps that S1, base metal is cleaned; the butt-joint end faces and the welding surfaces of the zirconium and nickel alloy pipes are polished and cleaned, and clean zirconium and nickel base materials are obtained; s2, a to-be-welded part is assembled; the to-be-welded end face of the clean base metal is assembled in a protective gas cavity of the rotary clamping device; s3, welding is conducted; a laser scanner is adopted for welding at a preset welding position, heat source gradient distribution of base metal at the two ends of a welding seam is controlled by regulating and controlling laser power, welding seam temperature field feedback is established through an infrared temperature sensor, and real-time monitoring and laser power regulating and controlling are conducted; s4, postweld heat treatment; and the laser power is adjusted in real time according to welding seam temperature field feedback so as to adjust and control the welding seam cooling process. According to the method, effective connection of zirconium-nickel indissolvable metal is achieved by controlling the regional welding temperature field, the temperature range for forming brittle compounds is avoided, the uniformity of a molten pool between Zr and Ni materials is ensured, and welding defects such as hot cracks and air holes are reduced.

The invention discloses an extracellular vesicle and a preparation method and application thereof, and belongs to the technical field of cosmetics, and the preparation method comprises the following steps: mixing rose and a PBS buffer solution, juicing, and filtering to obtain a filtrate; adding cellulase, xylanase and beta-glucanase into the filtrate, carrying out enzymolysis, and filtering to obtain an enzymatic hydrolysate; and centrifuging the enzymatic hydrolysate, filtering, resuspending and precipitating to obtain the rose extracellular vesicles. The rose extracellular vesicles can guarantee structural integrity and biological activity, can effectively load active ingredients, and can effectively deliver active molecules in the rose extracellular vesicles to target cells through interaction with membranes of skin cells. The extracellular vesicles can be fused with skin cell membranes to enter cells, active ingredients encapsulated by the extracellular vesicles are released, and the absorption efficiency of skin is improved.

The invention relates to the field of hydraulic oil cooling, in particular to a hydraulic oil cooler which comprises a tank body, a hydraulic oil inlet, a hydraulic oil outlet, a cooling liquid inlet and a cooling liquid outlet are formed in the tank body, two partition plates are fixedly arranged in the tank body, and a hydraulic oil storage area communicated with the hydraulic oil inlet and the hydraulic oil outlet is arranged between the two partition plates. Cooling liquid flowing areas communicated with the cooling liquid inlet and the cooling liquid outlet are arranged between the two partition plates and the tank body respectively, two cooling assemblies are arranged in the hydraulic oil storage area, a rotating shaft is arranged between the two cooling assemblies, and paddles are arranged on the rotating shaft. Kinetic energy of hydraulic oil is effectively absorbed through rotation of the paddles, the shaking amplitude of the hydraulic oil is reduced, along with rotation of the rotating shaft, the driving assembly drives the cooling pipes to reciprocate, the contact positions between the cooling pipes and the hydraulic oil are changed, the cooling effect is improved, and the cooling effect is improved. And the heat exchange efficiency is improved.

The utility model relates to the technical field of headboxes, in particular to a headbox flow control device. Comprising a headbox; a stirrer is arranged on one side of the headbox; the stirrer is connected with the headbox through a conveying pipe; the stirrer is connected with the conveying pipe through a conveying pump; an adjusting box is mounted between the conveying pipe and the headbox; one end of the conveying pipe is connected with the conveying pump; by arranging the adjusting box, when the conveying pump conveys flow pulp containing foam to the adjusting box, the foam in the flow pulp floats upwards to the upper end of the liquid level under the action of buoyancy, so that the flow pulp can flow into the flow pulp box through the connecting pipe at the lower end, the amount of the foam entering the flow pulp box is reduced, the density of a calcium silicate board is increased, and the production efficiency is improved. The strength and the stability of the plate are improved, bubble holes formed in the surface of the plate are reduced, and the appearance quality and the surface flatness of the plate are improved; therefore, the practical application effect of the utility model is effectively improved.

The invention relates to an application of a histone H3K18 lactic acid modification related target in preparation of a medicine for preventing or treating atherosclerosis. The invention belongs to the field of biological medicine, and discloses histone acetyltransferase P300 and application of histone H3K18 lactylation (H3K18la) modification mediated by the histone acetyltransferase P300 as a new target spot for treating atherosclerosis (AS). Researches find that in the AS process, lactic acid accumulation in vascular smooth muscle cells (VSMCs) up-regulates H3K18la through P300 catalysis, and then the pathological phenotype of the VSMCs is induced, and plaque development is promoted. H3K18la can be reduced and the phenotype can be improved by inhibiting LDHA and MCT1 in vitro or knocking out a P300 gene; the P300 for in-vivo targeted inhibition of the VSMCs can significantly reduce the artery plaque. Therefore, the P300 and H3K18la inhibitors can be used for preparing the anti-atherosclerosis medicine.

The utility model discloses a municipal engineering tubular steam generator, and relates to the technical field of steam generators. The tubular steam generator comprises a tubular steam generator body, a water inlet pipe is fixedly connected to the top of the tubular steam generator body, a steam pipe is fixedly connected to the top of the tubular steam generator body, and a heating pipe is fixedly connected to the bottom of the tubular steam generator body. The top of the tubular steam generator body is fixedly connected with a motor, and an output shaft of the motor is fixedly connected with a reciprocating lead screw. Through cooperation of the spring, the protruding block, the abutting block, the L-shaped knocking block and the arc-shaped scraping ring, resetting of the spring can drive the fixing block, the L-shaped knocking block and the abutting block to reset, so that the L-shaped knocking block knocks the arc-shaped scraping ring, dirt, including hard and stubborn dirt, attached to the inner wall of the tubular steam generator body is more effectively scraped away, and the service life of the tubular steam generator is prolonged. And the operation efficiency of the equipment is ensured.

The invention provides carbon-doped boron nitride for effectively adsorbing heavy metals in flue gas and a preparation method of the carbon-doped boron nitride, and belongs to the technical field of combined control of various atmospheric pollutants. According to the carbon-doped boron nitride, more carbon atoms are introduced into a boron nitride structure through carbon doping, the carbon atoms replace part of boron atoms, and the original structure of the boron nitride is changed; compared with boron nitride, the carbon-doped boron nitride has the advantages that the atom proportion of carbon atoms in the carbon-doped boron nitride is increased by 2.92%-58.22%, heavy metals in the flue gas are removed through the synergistic effect of physical adsorption and chemical adsorption, and simultaneous adsorption of more than one heavy metal in the flue gas is realized after 5 minutes. Compared with activated carbon as a heavy metal adsorbent, the preparation method is simple, the blank of adsorption capacity in high-temperature flue gas is filled, heavy metal substances such as Cd, Pd, Zn and Cu can be adsorbed at the same time, and the adsorbent is successfully applied to adsorption of heavy metal ions in the high-temperature flue gas.

The invention discloses freezing equipment for a processing technology of soft boiled abalones and a use method of the freezing equipment, and belongs to the technical field of freezing processing of abalones. Comprising a gasification type liquid nitrogen refrigerator, an electric valve sleeve, an electric adsorption module, a first electric telescopic rod and a semi-fan-shaped storage tank, the gasification type liquid nitrogen refrigerator is combined with a non-direct-contact freezing mode, and a traditional liquid nitrogen quick freezing method is adopted, so that the surfaces of abalones are quickly frozen, the internal temperature is slowly reduced, and the internal and external temperature difference is too large; the cell structure is destroyed. Compared with the prior art, the abalones are indirectly cooled by low-temperature gas, so that the problem that the surfaces of the abalones are frozen too quickly is avoided, and the temperature change of the whole abalones in the freezing process is more consistent. In addition, by injecting an antifreeze agent or a protective agent into the abalone, the formation of large ice crystals can be effectively reduced, and the fine structure in the abalone can be maintained. Therefore, the elasticity and the taste after unfreezing are enhanced, and the risk of texture damage caused by non-uniform freezing is greatly reduced.

The invention provides a preparation method of a perovskite thin film and a perovskite light-emitting diode. The method comprises the steps that lead iodide, lead bromide, a cesium iodide mixture and organic ammonium iodide salt are dissolved in a polar solvent, a perovskite precursor solution is obtained, and the cesium iodide mixture comprises cesium iodide and cesium triiodide; and dispensing the perovskite precursor solution on a substrate, enabling the substrate to rotate in an accelerated manner, and dropwise adding an anti-solvent in the rotation process to obtain the perovskite thin film. The perovskite thin film prepared by the invention is more compact and has fewer holes, meanwhile, the formation of a low-dimensional phase in the perovskite thin film is reduced, the defect density in the perovskite thin film is reduced, halogen movement is reduced, and better spectral stability and operation stability are realized while the efficiency and the brightness of a pure red light perovskite light-emitting diode are improved.

The invention discloses an anti-aging and anti-yellowing foaming polyester material and a preparation method thereof, and relates to the technical field of polyester materials. The anti-aging and yellowing-resistant foamed polyester material is prepared from the following raw material components in parts by weight: 3 to 5 parts of anti-ultraviolet SEBS (Styrene-Ethylene-Butylene-Styrene), 3.6 to 7 parts of triethylamine, 4 to 6 parts of flame-retardant and wear-resistant filler, 100 parts of TPEE (Thermoplastic Polyether Ester Ether), 0.9 to 1.1 parts of polymer wax and 0.6 to 0.8 part of foaming agent, the anti-ultraviolet SEBS is obtained by copolymerizing and grafting an unsaturated benzophenone ultraviolet absorbent, SEBS and maleic anhydride; the flame-retardant and wear-resistant filler is obtained by mixing and reacting carboxylated nano silicon dioxide, pentaerythritol and phosphorus oxychloride; the polymer wax adopts EVA (Ethylene Vinyl Acetate) wax; azodicarbonamide is adopted as the foaming agent; the anti-aging and anti-yellowing foaming polyester material disclosed by the invention is relatively good in mechanical property, anti-aging property, flame retardant property and compression resistance.