92results about How to "Efficient decomposition" patented technology

The invention discloses a cable fault positioning method and system based on reflected wave decomposition and kurtosis sorting, and aims to solve the problem that a cable fault is difficult to detect under a low impedance change rate. The method comprises the steps of transmitting an incident excitation signal to a cable to obtain a first reflection signal in the cable; an improved VMD algorithm is adopted for decomposition to obtain K IMF components, and the IMF with the maximum kurtosis is selected as a second reflection signal; acquiring a time-frequency distribution curve of the second reflected signal by using short-time Fourier transform and frequency spectrum redistribution technologies; and constructing a two-dimensional energy-time curve by extracting an energy value and time under the frequency of the maximum energy amplitude point, and determining a fault position. The system is composed of an incident excitation module, a decomposition module, an STFT-RSP module and a fault positioning output module, and the positioning method is achieved. According to the method, the limitation of a traditional spread spectrum time domain reflection positioning method in cable fault detection is effectively overcome, and an efficient and accurate instructive technology is provided for cable fault positioning and detection.

The invention discloses a characteristic value calculation method based on electrocardio data, belongs to the field of medical data analysis, and provides an electrocardio data analysis and processing method. Comprising the following steps: decomposing different frequency components of an electrocardiosignal by using wavelet transform, and analyzing on different time scales. Wavelet transformation is relatively suitable for detecting QRS wave groups, and due to the fact that the wavelet transformation can highlight transient characteristics of signals on different frequency bands, complex electrocardiosignal processing is more efficient. In addition, wavelet transform is not only suitable for wave crest detection, but also can help to remove signal noise and improve signal definition. The deep learning technology is used for automatically extracting the features from the electrocardiosignals, a feature extractor does not need to be manually designed, related medical professional knowledge and the artificial intelligence technology are combined, wave crests in the electrocardiosignals can be more accurately detected, and meanwhile anomaly detection can be carried out, such as early signs of heart diseases such as sinus arrhythmia and the like.

The invention provides a photocatalytic barrier composite film for fresh keeping of fruits and vegetables and a preparation method thereof, and the preparation method comprises the following steps: sequentially adopting 1, 3-propane sultone and octadecyl trimethyl ammonium chloride to carry out modification treatment on nanocellulose to obtain quaternary ammonium sulfonated nanocellulose; the preparation method comprises the following steps: carrying out organic intercalation modification treatment on montmorillonite by adopting hexadecyl trimethyl ammonium bromide and caprolactam, and carrying out hydrophobic modification treatment on intercalated montmorillonite by adopting a silane coupling agent to obtain composite modified montmorillonite; the titanium precursor solution and the zinc precursor solution are sequentially dripped into the montmorillonite dispersion liquid, then aging, centrifuging, washing, drying and calcining are conducted, and load modified montmorillonite is obtained; uniformly mixing polylactic acid, quaternary ammonium sulfonated nano cellulose, the loaded modified montmorillonite, a plasticizer, a lubricant and an antioxidant to obtain a mixed material, and sequentially performing melt extrusion, cooling, pelletizing and film blowing on the mixed material to obtain the photocatalytic barrier composite film.

The invention provides an efficient and environment-friendly printing and dyeing sewage decolorizing agent which is mainly prepared from the following raw materials in parts by mass: 10-17 parts of nanoscale silicon dioxide, 5-12 parts of concentrated sulfuric acid, 8-13 parts of a polyacrylamide emulsion, 5-17 parts of lignosulfonate, 3-10 parts of a metal ion chelating agent and 10-25 parts of deionized water. The decolorizing agent provided by the invention has good adsorption performance and chemical stability, and is low in cost and high in decolorizing efficiency on printing and dyeing sewage.

The invention provides high-naringenin-content modified shaddock peel fiber gel and a preparation method thereof.The preparation method comprises the following steps that after shaddock peel white pulp is subjected to quick freezing and smashing, pretreatment is conducted through an electrochemistry-assisted gradient enzymolysis technology, then customized immobilized naringinase is adopted for treatment, and high-naringenin-content shaddock peel fibers are obtained; and finally, uniformly mixing the fiber with carnosic acid and soybean saponin, and adding magnesium chloride for cross-linking and curing to obtain the modified shaddock peel fiber gel. According to the preparation method, electrochemical assisted gradient enzymolysis is adopted, so that a compact network structure of fibers can be destroyed to increase active sites, the immobilized naringinase not only can efficiently convert naringin and accurately enrich naringenin, but also can effectively improve bitter taste, and magnesium ions regulate and control a multiple cross-linked network formed by the components, so that the gel structure tends to be more stable; meanwhile, naringenin is stably loaded so as to avoid migration and aggregation of the naringenin, and the bioavailability and active efficacy of the naringenin are remarkably improved.

The invention discloses a high-altitude glass curtain wall cleaning device based on an unmanned aerial vehicle, and relates to the technical field of glass curtain wall cleaning, the high-altitude glass curtain wall cleaning device comprises an unmanned aerial vehicle mounting platform, and the unmanned aerial vehicle mounting platform is mounted at the bottom of the unmanned aerial vehicle; the water tank is mounted in the unmanned aerial vehicle mounting platform; the adsorption type cleaning actuator is arranged at the end, away from the water tank, of the unmanned aerial vehicle mounting platform, and the water tank is connected with the adsorption type cleaning actuator through a pipeline; the pushing mechanism is arranged on the unmanned aerial vehicle mounting platform and located between the water tank and the adsorption type cleaning actuator, and a locking mechanism used for separation / connection of the adsorption type cleaning actuator is arranged between the adsorption type cleaning actuator and the pushing mechanism; and the safety rope winding mechanism is arranged in the unmanned aerial vehicle mounting platform and is connected with the adsorption type cleaning actuator. The unmanned aerial vehicle serves as an intelligent transportation platform and is responsible for accurately transporting the integrated adsorption type cleaning actuator to an operation starting point and recycling the integrated adsorption type cleaning actuator.

This invention relates to a method for in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste. The technical solution is as follows: vanadium-containing solid waste is ground into powder, and the resulting vanadium-containing solid waste powder is mixed with vanadium pentoxide powder. The resulting vanadium-containing geopolymer precursor is mixed with an alkaline activator and stirred evenly to obtain a vanadium-containing geopolymer slurry. The vanadium-containing geopolymer slurry is placed in a mold, cured, demolded, cured a second time, and crushed to obtain a crushed vanadium-containing geopolymer. The crushed vanadium-containing geopolymer is mixed with deionized water to obtain a vanadium-containing geopolymer aqueous solution. Bismuth nitrate solution is added to the vanadium-containing geopolymer aqueous solution, mixed evenly, and the pH value is adjusted. A hydrothermal reaction is then carried out. Solid-liquid separation, washing, and drying are performed to obtain the visible light photocatalytic geopolymer. This invention can efficiently utilize low-vanadium content and completely eliminate vanadium. The in-situ synthesis of visible light photocatalytic geopolymers from vanadium-containing solid waste not only effectively decomposes organic pollutants under visible light conditions but also effectively fixes vanadium in the vanadium-containing solid waste.

The invention discloses a rotary smokeless open fire moxibustion device, and relates to the technical field of moxibustion health maintenance equipment. The box body is internally provided with a containing cavity, and a pedal extending to an opening is arranged in the containing cavity; a rotary moxibustion therapy assembly and a filtering and purifying assembly are further arranged in the box body. The rotary moxibustion therapy assembly comprises a stepping motor, a transmission gear set and a pomander used for fixing a moxa cone, and the pomander is eccentrically fixed to a rotating piece of the transmission gear set and driven by the stepping motor to rotate around the pedal area. The filtering and purifying assembly comprises a filtering cotton box, a three-way catalyst box and an exhaust port provided with a fan which are communicated in sequence. And the air inlet hole, the accommodating cavity and the filtering and purifying assembly on the box body are sequentially communicated under the driving of the fan to form a directional air circulation passage. The limitation that the traditional moxibustion position is fixed is broken through, and all-directional dead-corner-free physical therapy is achieved; meanwhile, through directional airflow and a multi-stage deep purification system, stable combustion of moxa cones is guaranteed, and environment-friendly zero emission of waste smoke is achieved.

The invention belongs to the technical field of organic fertilizers, and particularly relates to a straw-based biochar composite slow-release fertilizer for saline-alkali soil improvement and a preparation method of the straw-based biochar composite slow-release fertilizer. The preparation method comprises the following steps: (1) uniformly mixing sheep manure and pigeon manure, mixing the mixed manure with crushed corn straw to obtain a total material, inoculating bacillus subtilis, and composting and fermenting to obtain a primary organic matter; (2) fermenting the primary organic matter by using aspergillus niger, trichoderma reesei and saccharomyces cerevisiae to obtain a submerged fermentation organic matter; (3) crushing the submerged fermentation organic matter to prepare particles; the composite coating powder is scattered into the submerged fermentation organic matter, coating is conducted, and the coated organic matter is obtained; and (4) uniformly mixing the coated fermented organic matter, biochar, desulfurized gypsum, humus soil, a water-retaining agent and ammonium dihydrogen phosphate to obtain the straw-based biochar composite slow-release fertilizer for saline-alkali soil improvement. The organic fertilizer can improve the pH value of saline-alkali soil, reduce the salt content and increase the organic matter content.

The present application relates to sewage treatment technical field, specifically to a kind of acrylonitrile sewage treatment device, comprising: microbial purification tank, exhaust mechanism, the exhaust mechanism has two and symmetrically set in the two sides of the inner wall of microbial purification tank width direction, the exhaust mechanism includes the cavity plate fixedly connected in the inner wall of microbial purification tank. By cavity plate, partition block and air separation assembly in exhaust mechanism, air can be injected and extracted into microbial purification tank, so as to provide corresponding purification environment for aerobic microorganism or anaerobic microorganism to purify sewage, and then realize that when injecting air, air exposure area and immersion area can inject air into microbial purification tank simultaneously to provide sufficient oxygen for aerobic microorganism to purify sewage, help its efficient decomposition of pollutants in sewage, while when extracting air, air separation assembly disconnects the communication of air exposure area and immersion area, so that suction airflow is only discharged from air exposure area, avoid sewage from flowing out with cavity plate, while avoiding suction airflow from immersion area to interfere with anaerobic environment in tank.

The application discloses an aquaculture tail water treatment system and a use method thereof, which comprises a tail water storage tank, a high-pressure treatment unit, a photocatalytic reactor and a control unit. The high-pressure treatment unit comprises a supercritical water reactor, a controller connected with the control unit, a temperature sensor installed on the supercritical water reactor, a pressure sensor and a viscosity monitor used for monitoring the viscosity of tail water. The controller is used for receiving data collected by the temperature sensor and the pressure sensor. The supercritical water reactor has two different environmental states, i.e. a subcritical water environment and a supercritical water environment. The control unit adjusts parameters in the supercritical water reactor and switches the two different environmental states. The solubility of mucus, gonad hormones, organic matters and other impurities in tail water can be enhanced, and the macromolecular network structure and proteins in the impurities can be effectively destroyed, so that more efficient decomposition is realized.

The invention discloses a catalyst for low-temperature direct catalytic decomposition denitration as well as a preparation method and application thereof, and belongs to the technical field of direct catalytic decomposition denitration. The preparation method comprises the following steps: by taking potassium ferricyanide, manganese nitrate and polyvinylpyrrolidone as raw materials, preparing a ferromanganese oxide carrier with a hollow structure by adopting a coprecipitation method and high-temperature annealing, and then loading noble metal rhodium on the ferromanganese oxide carrier by adopting an impregnation method, thereby obtaining the denitration catalyst for low-temperature direct catalytic decomposition. When the low-temperature direct catalytic decomposition denitration catalyst is prepared, the reduction-state nano hollow ferromanganese oxide carrier with the hollow structure is adopted, oxidation inactivation of rhodium can be effectively inhibited, and the low-temperature direct denitration activity of the catalyst is greatly improved. The operation process is simple, a reducing agent is not needed, and secondary pollution is avoided; meanwhile, the reaction temperature is low, the denitration efficiency is high, and the direct emission standard of nitric oxide can be met.

The present invention discloses a contact negative oxygen ion therapy instrument, which relates to the technical field of negative oxygen medical technology. The present invention includes a negative oxygen ion generator, an instrument housing, and an air intake unit installed at the tail of the instrument housing: the negative oxygen ion generator is installed in front of the air intake unit and the instrument housing is configured with an air outlet for blowing out negative oxygen ions; the air outlet is replaceably provided with an instrument end head, and the instrument end head is used to cover the wound. The present invention designs the instrument housing and installs a small fan at the tail of the instrument housing. When the negative oxygen ion generator is powered on, the airflow generated by the small fan not only provides sufficient oxygen, but also allows the generated negative oxygen ions to reach the wound through the air duct constructed by the instrument housing and the instrument end head. The channel isolates the external environment, so the external factors that cause loss of negative oxygen ions are greatly reduced, thereby achieving the effect of improving the negative oxygen ion treatment of wounds and scars.

The invention discloses an integrated micro-fluidic chip system for detection, photothermal decomposition and verification of perfluorinated and polyfluoroalkyl substances. The integrated micro-fluidic chip system comprises an upper ultraviolet light-emitting layer, a middle micro-fluidic main body layer and a lower constant-temperature heating layer, the middle microfluidic main body layer internally comprises an inlet channel, an optical detection module, a photothermal decomposition chamber, a circulating pump structure, a residue verification chamber and an outlet channel; the upper ultraviolet light-emitting layer and the lower constant-temperature heating layer are respectively arranged corresponding to the photothermal decomposition chamber so as to provide a light field and a thermal field which have a synergistic effect; the system further comprises an external control circuit for controlling the operation of the circulating pump structure, the upper ultraviolet light-emitting layer and the lower constant-temperature heating layer, and controlling the path selection of the fluid according to the output result of the residual verification chamber, so as to realize a closed-loop treatment flow. According to the three-layer micro-fluidic chip system provided by the invention, efficient and reliable treatment on perfluoro and polyfluoroalkyl substances is realized through photo-thermal synergistic degradation and closed-loop feedback control.

The utility model relates to the technical field of bricks, and particularly discloses a low-carbon environment-friendly self-cleaning brick which comprises a brick body, a photocatalytic film layer, a biochar layer and a water permeable layer are respectively arranged on the top surface of the brick body, a waterproof layer is arranged on the bottom surface of the brick body, the photocatalytic film layer is made of titanium dioxide, the biochar layer is made of biochar, and the water permeable layer is made of water. According to the low-carbon environment-friendly self-cleaning brick, the photocatalytic film layer, the biochar layer and the water permeable layer are arranged on the top face of the brick body, harmful gas in air can be effectively decomposed, pollutants can be strongly adsorbed, rainwater can be promoted to permeate rapidly, and therefore the low-carbon environment-friendly self-cleaning brick has the advantages of being environmentally friendly, environmentally friendly and capable of being recycled. And the waterproof layer arranged on the bottom surface of the brick body effectively prevents water in the brick body from leaking to the outside of the brick body, so that damages such as corrosion, deformation and the like of a building structure caused by accumulated water erosion are reduced, the durability is improved, and the practicability is high.

The present application relates to the technical field of steviol production, and particularly relates to a steviol wastewater treatment method, which comprises the following steps: collecting, adjusting and treating wastewater, hydrolyzing, blowing off, one-time settling, water distribution, anaerobic reaction, activated sludge pool and two-time settling, so that the organic matters in the wastewater are effectively decomposed, and the wastewater treatment efficiency is improved.

The application discloses application of a PCSK9 inhibitor Alirocumab in prevention and treatment of gallbladder stones. The application is characterized in that, through pharmacological experiments in a mouse gallbladder stone model, the PCSK9 inhibitor Alirocumab can effectively reduce the content of cholesterol in mouse bile, and can prevent the formation of mouse gallbladder stones and dissolve the formed gallbladder stones. After administration, under ultrasonic monitoring, the diameter of the stones gradually decreases with the increase of the administration time. Therefore, the application provides a new drug for effectively preventing and treating cholesteric gallbladder stones. The PCSK9 inhibitor Alirocumab provided by the application has good clinical application value and application prospect as a drug for preventing and treating cholesteric gallbladder stones.

The utility model relates to the technical field of curtain walls, in particular to a high-energy-saving unit type curtain wall structure which comprises photovoltaic glass, a ceramic aluminum acoustic panel, a rubber and plastic heat preservation layer, an aluminum silicate heat preservation layer, an inorganic active heat preservation layer, an aluminum alloy connecting strip and a butt joint plate with an inner groove. The rubber and plastic heat preservation layer is in adhesive connection with the inner surface of the photovoltaic glass through hot melt adhesive, the outer surface of the aluminum silicate heat preservation layer is in adhesive connection with one side of the rubber and plastic heat preservation layer, and the outer surface of the inorganic active heat preservation layer is in adhesive connection with one side of the aluminum silicate heat preservation layer. According to the high-energy-saving unit type curtain wall structure, the photovoltaic glass not only serves as a building envelope, but also can convert solar energy into electric energy, partial self-supply of building energy is achieved, and the nanometer titanium dioxide coating in the inorganic active heat preservation layer has the photocatalysis effect under the illumination condition and can effectively decompose formaldehyde, VOCs and other harmful gases.

The application discloses a method for extracting lithium, cesium and rubidium from pegmatite lithium concentrate, comprising the following steps: step 1, uniformly mixing mixed roasting additives with pegmatite lithium concentrate to obtain a mixture; step 2, performing alkali roasting on the mixture to obtain a calcine containing lithium, rubidium and cesium; step 3, finely grinding the calcine containing lithium, rubidium and cesium, and then adding a leaching agent to leach the calcine to obtain a solution containing lithium, rubidium and cesium; and step 4, extracting lithium, rubidium and cesium from the solution containing lithium, rubidium and cesium. By adding mixed roasting additives to the pegmatite lithium concentrate raw material, low-temperature alkali roasting can be realized. In addition, the method provided by the application can be used for large-scale industrial production, is energy-saving and environment-friendly, low in cost, and has a wide popularization prospect.

The present application relates to a kind of non-destructive disassembly device for mechanical inertia instrument, including disassembled piece connection positioning mechanism, disassembly limit seat, disassembly screw, disassembly nut, instrument main body connection positioning mechanism, disassembly wrench.Disassembly, disassembled piece connection positioning mechanism low stress fixed disassembled piece, disassembly limit seat or instrument main body connection positioning mechanism limits instrument main body axial movement, under the action of disassembly screw axial force, disassembled piece and disassembled piece connection positioning mechanism together relative disassembly limit seat, disassembly limit seat or instrument main body connection positioning mechanism moves along the axial direction, and separates from instrument main body.The present application also relates to a kind of non-destructive disassembly method for mechanical inertia instrument, including the process of cleaning glue layer, clamping, pre-tightening force, heating, disassembly.The force value of the disassembly device of the present application can be adjusted, kept, and it is convenient to implement disassembly to the assembly of different cooperation precision, separation intensity.The disassembly method of the present application is evenly stressed to disassembled piece, and there is no damage.

The invention provides a method for determining the content of precious metal elements in an automobile purification catalyst, and belongs to the technical field of analysis and detection. According to the method, a composite melting system composed of sodium peroxide, anhydrous sodium metaborate and sodium tungstate is constructed, an automobile purification catalyst sample is subjected to efficient melting decomposition, complete leaching of a melt is achieved in combination with a hydrochloric acid and tartaric acid composite acidification system, a tin-tellurium coprecipitation enrichment technology is introduced on the basis, and the purity of the automobile purification catalyst sample is improved. Trace precious metal elements such as platinum, palladium and rhodium are selectively precipitated and effectively enriched, and matrix interference is remarkably reduced; and then adding an indium internal standard solution and carrying out quantitative determination by adopting inductively coupled plasma emission spectrometry, thereby realizing high-sensitivity and high-accuracy analysis of the noble metal element. The method effectively solves the problems of incomplete sample decomposition, low precious metal recovery rate, serious matrix interference, poor detection result stability and the like in the prior art.

The present application relates to the technical field of environmental protection water treatment, in particular to a preparation method and application of one-step aluminum modified fish scale calcium defluorination material; the present application successfully prepares the defluorination material with economy and high efficiency by combining hydrochloric acid demineralization pretreatment with sodium metaaluminate one-step modification process; the removal rate of the composite material prepared by the present application to 10mg / L fluoride ion solution can reach 94.76%, the theoretical maximum adsorption capacity reaches 118.53mg / g, the actual test adsorption capacity reaches 9.56mg / g, and the stable and efficient adsorption performance is maintained in the pH 3-6 range; the process of the present method is simple, the reaction conditions are mild, and the material preparation cost is significantly reduced, which provides an innovative solution with practicability and economy for fluorine-containing wastewater treatment.

The application relates to a sulfide nickel heterojunction modified Prussian blue analogue hollow nanocage catalyst and a preparation method and application thereof. A normal-pressure one-step reflux method is used to perform synchronous etching and sulfidation treatment on a NiFe Prussian blue analogue by using thioacetamide and urea, a NiS2 heterojunction and a hollow nanocage structure are in-situ constructed, the purpose is to implement electronic structure pre-regulation on a metal active center by using the NiS2 heterojunction, to reduce a reconstruction energy barrier and to pre-optimize the electronic structure of an active phase after reconstruction, and meanwhile, the hollow structure promotes deep reconstruction from the surface to the inside. The catalyst prepared by the application has excellent oxygen evolution reaction activity and kinetics, and has high stability and high-efficiency solar-driven water splitting performance.

The application belongs to the technical field of hydrometallurgy, and particularly relates to a method for preparing ammonium paratungstate by using wolframite or mixed wolframite, which comprises the following steps: ball milling the wolframite or mixed wolframite; then adding NaOH to perform first-stage alkali boiling to obtain first alkali boiling residue and first alkali boiling liquid, and then adding NaOH to the first alkali boiling residue to perform second-stage alkali boiling; adding a calcium-containing reagent into the first alkali boiling liquid and stirring to perform tungsten precipitation to obtain artificial white tungsten; using a sulfuric acid-oxalic acid mixed solution to decompose the artificial white tungsten to obtain a tungsten oxalate complex solution; then performing thermal decomposition, solid-liquid separation to obtain tungstic acid, and performing ammonia dissolution, evaporation crystallization and drying on the tungstic acid to obtain APT. The method realizes efficient decomposition of the wolframite and the mixed wolframite through a relatively short technological process, breaks through the limitation that the sulfuric acid-oxalic acid mixed system cannot treat the wolframite or the mixed wolframite, simultaneously reduces the reagent consumption and the cost, and greatly reduces the generation of high-salinity wastewater.

This invention belongs to the field of food technology, specifically relating to a fermented tomato cube and its preparation method. The preparation method includes the following steps: (1) Peel and seed fresh tomatoes, cut them into cubes, sterilize them, and place them in a sterile fermentation container. First, add *Lactobacillus casei*, mix evenly, and anaerobic ferment. Then, add *Lactobacillus rhamnosus*, mix evenly, and continue anaerobic fermentation. After sterilization, fermented tomato cubes are obtained; (2) Wash and peel onions, cut them into cubes, and pre-cook them to obtain pre-cooked onion cubes; (3) Mix the fermented tomato cubes, pre-cooked onion cubes, and seasonings evenly, cook at 80-85℃ for 20-25 minutes, and cool to room temperature to obtain fermented tomato cubes. The preparation method of this invention can ensure the efficient increase of total phenols in fermented tomato cubes while reducing the degradation of lycopene, achieving synergistic optimization of the nutritional quality of fermented tomato cubes, and improving the sensory quality of the final product.

This invention relates to the field of coatings, specifically to a wear-resistant, formaldehyde-removing artistic coating and its preparation method. The coating, by weight, comprises: 45-55 parts of waterborne polyurethane-modified acrylic emulsion, 15-25 parts of silane-modified filler, 4-8 parts of supported formaldehyde-removing filler, 6-12 parts of pigment, 0.2-0.6 parts of dispersant, 0.1-0.4 parts of defoamer, 0.3-0.8 parts of thickener, 1-3 parts of film-forming aid, and 15-25 parts of deionized water. This invention achieves a balance between film hardness and toughness by using waterborne polyurethane-modified acrylic emulsion as the film-forming substance and combining it with silane-modified filler. The polyurethane segments provide excellent flexibility and resilience, the acrylic segments provide high hardness, and the silane-modified filler forms a strong chemical bond with the resin matrix through a silane coupling agent, improving the overall performance of the coating and extending its service life.

The present application relates to air purification technical field, especially to a kind of purification equipment for removing coating formaldehyde, including shell, mounting plate fixedly connected in the cavity of shell.The present application is provided with self-cleaning mechanism, driving motor drives scraper to rotate around filter assembly, and cooperate with spiral conveying roller, dust scraped is automatically transported into collection box, realize the automatic cleaning of filter screen surface, effectively avoid filter screen blockage, ensure the persistence of filtering efficiency, by setting air flow guiding mechanism, servo motor drives rotating ring, on the one hand, drive fan blade to rotate, form auxiliary air flow, enhance air flow, on the other hand, through swing component drive air jet cylinder up and down swing, make air flow evenly into air duct, prolong the residence time and contact area of air flow in photocatalyst area, by setting photocatalyst decomposition mechanism, UV lamp irradiates photocatalyst coating in air duct, improve the purification efficiency and thoroughness of formaldehyde.

The application belongs to the technical field of solar photovoltaic materials, and particularly discloses a preparation method of phosphorus-doped silicon master alloy. A double-temperature-zone horizontal furnace is used, and zinc phosphide is used as a dopant. A sealed quartz horizontal ampoule is arranged in the double-temperature-zone horizontal furnace. A graphite boat is arranged in the high-temperature section of the quartz horizontal ampoule, and polycrystalline silicon material is arranged in the graphite boat. A quartz crucible is arranged in the low-temperature section, and zinc phosphide is arranged in the quartz crucible. Different temperatures of the high-temperature section and the low-temperature section are set, and the temperature is kept for a period of time, and then the temperature is reduced to obtain the phosphorus-doped silicon master alloy. The speed of synthesizing the phosphorus-doped silicon master alloy is fast, the method is safe and reliable, the requirement for equipment is low, and the manufacturing cost of the phosphorus-doped silicon master alloy is greatly reduced.

The invention discloses an ammonia decomposition hydrogen production catalyst and a preparation method and application thereof, and belongs to the technical field of catalytic chemistry and hydrogen energy. According to the preparation method of the catalyst for hydrogen production through ammonia decomposition, the problems that an existing catalyst is poor in low-temperature activity and low in mass transfer efficiency are solved through process optimization such as carrier circulation modification and two-stage roasting. The prepared catalyst is high in activity, can realize efficient decomposition of NH3 at low temperature, is wide in adaptive airspeed, can still realize high conversion rate of NH3 at high airspeed, has ammonia decomposition conversion rate of more than or equal to 90% under the conditions of 400-550 DEG C, normal pressure and ammonia airspeed of 1000-30000 ml / g.h, and has remarkable industrial value.