90results about How to "Strong load" patented technology

The invention discloses an intelligent server management method and system in an edge computing environment, and relates to the field of electrical digital data process.The method comprises the steps that a dynamic load buffer database is established; calculating a load stability coefficient of each server node; when the load stability coefficient of the server node is smaller than a first preset threshold value, marking the server node as a fluctuation node; calculating a node cooperation efficiency value; determining a target server candidate set, and calculating to obtain a task allocation weight; distributing tasks on the fluctuation nodes to server nodes in the target server candidate set; when the continuous preset duration of the real-time load value of the fluctuation node is lower than a third preset threshold value, calculating a processing efficiency improvement proportion; for the task of which the processing efficiency improvement proportion is greater than a fourth preset threshold value, keeping continuous processing at the current server node; and for the tasks of which the processing efficiency improvement proportion is smaller than or equal to a fourth preset threshold value, returning to the original fluctuation node. The method and the device are used for reducing communication overhead and service processing delay between nodes.

The invention discloses a PMSM (permanent magnet synchronous motor) AC servo system speed control method based on improved particle swarm optimization optimization RBF (radial basis function) fuzzy neural network PID control, the system is composed of a speed outer ring and a current inner ring, and the current ring adopts a PI regulator. A speed loop is designed to be an RBF fuzzy neural network PID speed controller, an RBF fuzzy neural network is optimized by improving a particle swarm optimization algorithm, and optimal parameters kp, ki and kd suitable for the PID controller are output. Simulation analysis and experiment results show that compared with a common PID control strategy, a BP algorithm optimization fuzzy neural network PID control strategy and a particle swarm algorithm optimization RBF fuzzy neural network PID control strategy, the particle swarm algorithm optimization RBF fuzzy neural network PID control strategy based on the improved particle swarm algorithm has optimal control performance; the method has the advantages of being high in dynamic response speed, good in control stability, resistant to load disturbance and high in robustness, and the excellent speed control effect of the PMSM alternating current servo system can be achieved.

The invention belongs to the technical field of food processing of pectin, and discloses limonin-pectin emulsion gel with anti-inflammatory and intestinal probiotic functions as well as preparation and application of the limonin-pectin emulsion gel. The method comprises the following steps: 1) dissolving pectin with the esterification degree of 10-40% and the RGI proportion of 20-40% in water to obtain a pectin solution; adjusting the pH value to 3-6, adding a calcium ion solution, and shearing to obtain pectin sol; 2) dissolving limonin in the oil phase to obtain an oil phase containing limonin; and adding the oil phase containing the limonin into the pectin sol, carrying out shearing treatment, and standing to obtain the pectin emulsion gel loaded with the limonin. The emulsion gel provided by the invention can be independently used as an emulsifier, can stably load limonin, and realizes relatively high embedding efficiency. The emulsion gel disclosed by the invention can be used for remarkably regulating intestinal flora and increasing the content of short-chain fatty acid, and has remarkable anti-inflammatory and prebiotic activity. The emulsion gel provided by the invention is used for anti-inflammatory and intestinal probiotic functional products.

The invention discloses a double-tension-interval-based film feeding system for a multi-column packaging machine, which comprises a paper roll mechanism arranged at the bottom of a rack, and a paper film changing mechanism, a film feeding device, a swing shaft roller tensioning mechanism, a laser coding mechanism, a laser coding position adjusting mechanism and a damping mechanism are sequentially arranged at the downstream of the paper roll mechanism according to the film feeding direction, an encoder alarm device and a mark tracking photoelectric sensor mark position adjusting mechanism are further arranged on the machine frame. During working, the film feeding device pulls out a paper film from a paper film roll of the paper roll mechanism, and the brake shaft is braked by the brake block, so that the paper film forms a first tension interval between the paper roll mechanism and the film feeding device; the damping mechanism is located at the output end of the film feeding system, the paper film is wound in a swing tensioning roller shaft system of the swing shaft roller tensioning mechanism, and the swing tensioning roller shaft system droops under the action of gravity, so that the paper film forms a second tension interval between the film feeding device and the damping mechanism. The film feeding device can be matched with a multi-column packaging machine, can continuously feed films and is stable in tension.

The invention belongs to the technical field of metal-organic framework functional materials, and particularly relates to a nickel-based metal-organic framework material, a plasmon nickel-based metal-organic framework composite material and a synthesis method and application of the nickel-based metal-organic framework material and the plasmon nickel-based metal-organic framework composite material. According to the invention, chloroauric acid is directly reduced into gold nanoparticles by using the reducibility of the nickel-based metal organic framework material, and the gold nanoparticles are loaded on the nickel-based metal organic framework material, so that uniform dispersion and firm loading of the gold nanoparticles on the nickel-based metal organic framework material are realized. The method has the advantages of simple synthesis method, convenience in operation and no need of additional reducing agent, is easy for large-scale preparation, and has better market application value and development prospect. The prepared plasmon nickel-based metal organic framework composite material is used as a photoelectrocatalytic reaction catalyst to be applied to photoelectrocatalytic reduction of nitrate to prepare ammonia, and the catalytic performance is excellent.

The invention discloses a guide plate coating for a hot-rolled seamless steel pipe and a preparation method thereof, and belongs to the technical field of material preparation, the coating comprises the following components by weight: 30-60 parts of high temperature resistant organic silicon resin, 10-20 parts of a silane coupling agent, 3-20 parts of modified basalt fiber, 3-10 parts of sodium carboxymethyl cellulose, 0.5-5 parts of a dispersant, and 50-80 parts of ethanol. Physical interlocking and chemical bond linkage between modified basalt fiber cloth and other components of the coating are achieved, lanthanum-doped heteropolyacid nanometer POSS microspheres are loaded on the surfaces of modified basalt fibers, the nanometer structure of the POSS microspheres and other components in the coating form physical entanglement, the overall structural stability of the coating is improved, and the stability of the coating is improved. 2, 4, 6, 7, 8-tetrahydroxy anthraquinone can chemically react with a silane coupling agent, high-temperature-resistant organic silicon resin and the like to form a chemical bond and a three-dimensional structure, so that the coating has the advantages of high temperature resistance, impact resistance, wear resistance and cold and heat cycle resistance, and is suitable for a working environment of a guide plate of a hot-rolled seamless steel pipe.

The invention relates to the technical field of ammonia treatment catalysts, in particular to a Ru-loaded nitrogen-containing porous carbon bifunctional catalyst based on toluene diisocyanate waste residues and a preparation method and application of the Ru-loaded nitrogen-containing porous carbon bifunctional catalyst based on toluene diisocyanate waste residues. S2, preparing a modified Ru precursor solution; s3, a carrier with the mass accounting for 0.1-20% of the mass of the modified Ru precursor solution is added into the modified Ru precursor solution, uniform dispersion and reaction are conducted, and turbid liquid is obtained; s4, heating the turbid liquid, and drying for 1-48 hours under the condition of 25-100 DEG C to obtain a solid product; and S5, calcining the solid product in a gas atmosphere to obtain the Ru-loaded nitrogen-containing porous carbon bifunctional catalyst based on the toluene diisocyanate waste residues. According to the preparation method, industrial waste residues are adopted as raw materials, solid waste emission is reduced, meanwhile, the preparation cost of the catalyst is remarkably reduced, and important economic and social benefits are achieved; the method is simple and easy to operate, low in energy consumption in the preparation process and suitable for large-scale production.

The present application discloses a detection method, device and inverter system for an inverter system, and belongs to the technical field of inverter systems. The detection method for the inverter system includes: obtaining the output power corresponding to the target system connected to the at least one load; the target system is used to power the at least one load; the target system includes the photovoltaic system; based on the output power and the total power corresponding to the at least one load, performing arc detection on the faulty photovoltaic strings in the photovoltaic system. The detection method for the inverter system of the present application ensures the stability of load operation during arc detection, alleviates the impact of the reduction in the output power of the inverter system on load operation, improves the performance of the load and extends the service life of the load, reduces the safety hazards caused by unstable load operation, and improves the user experience.

The invention discloses a preparation method of monatomic platinum based on acoustic suspension, and relates to the technical field of monatomic preparation. The method comprises the following steps: dispersing MoS2 powder in a platinum source solution, adding a stabilizer, and uniformly mixing to obtain a precursor solution; suspending the precursor solution by adopting an acoustic suspension method, and modulating sound field parameters to obtain suspension droplets with oscillating motion; and adding a reducing agent into the suspension drops, and carrying out a reduction reaction to obtain monatomic platinum loaded on the MoS2 substrate. According to the invention, an acoustic suspension technology is adopted, the stable loading of monatomic Pt is realized through ultrasonic effects such as fan harmonic oscillation enhanced acoustic streaming excited by an ultrasonic field, and the preparation method has the advantages of high efficiency, stability and uniform loading.

This invention discloses a dual-motor hair dryer, relating to the field of hair dryer technology. It includes a housing, a handle, and a mounting cover installed inside the housing. It also includes a dual-system blowing assembly, a drive assembly, a first adjustment assembly, and a second adjustment assembly located inside the mounting cover. In use, the right-side main motor fan system, through the cooperation of the air guide tube, main air duct, and inner air duct, delivers gas to the inner cylinder, evenly passing through the heating element. Simultaneously, the left-side auxiliary motor fan system delivers gas to the outer air duct through the air guide tube, auxiliary air duct, and flow equalization pipe. The gas flows through the annular air cavity, forming an annular air curtain that surrounds the hot air along the central axis. The annular cold air curtain and the hot air along the central axis are coaxially superimposed. Furthermore, the main and auxiliary air ducts are isolated, ensuring that the high temperature of the main air duct does not affect the auxiliary motor, resulting in high operating efficiency for the auxiliary motor. The main motor also experiences stable load due to the smooth air duct, significantly improving the overall energy efficiency and further achieving energy savings.

The utility model discloses a cable grid bridge system comprising a turning bridge which is composed of a plurality of bridge units arranged in a divergent manner to form an inner arc structure and an outer arc structure. Each bridge unit comprises two parallel U-shaped wefts and a plurality of radial line units, each U-shaped weft is composed of an outer vertical beam, a bottom beam and an inner vertical beam, and each radial line unit comprises a bottom radial line unit, an outer diameter line unit and an inner diameter line unit which are respectively connected to different parts of the corresponding U-shaped weft; the outer diameter line units are connected to form a continuous bridge outer diameter line; the inner vertical beams of the adjacent bridge units abut against each other, the inner diameter line unit is provided with two ends, reinforcing ribs are welded between the bottom beams, a bridge bottom diameter line is formed, and therefore the turning bridge system is low in cost and convenient to manufacture.

The utility model discloses a multidirectional glue spraying uniform smearing device for mattress production, which comprises a working table, door frames are fixedly connected to two ends of the upper part of the working table, the working table is fixedly connected with a box body through the two door frames, a negative pressure cover is arranged in the middle of the upper part of the box body, a sliding seat is arranged in the box body, and the sliding seat is fixedly connected with the working table through the door frames. Sliding rods are slidably connected to the two ends of the upper portion of the sliding base, the two ends of the two sliding rods are fixedly connected with the two sides of the upper portion of the corresponding portal frame correspondingly, and a lead screw nut is fixedly connected to the middle of the upper portion of the sliding base. The two glue spraying seats capable of independently and transversely sliding are arranged below the sliding seat, and are matched with the glue spraying guide plate with the corrugated teeth, so that the glue sprayers below the glue spraying seats can generate transverse displacement under the action of the corrugated teeth and the return springs when the sliding seat moves, and further, the paths of the coated glue lines are staggered, so that the glue is uniformly coated, and the production efficiency is improved. And the condition of non-uniform bonding is reduced.

The invention relates to the technical field of mold opening and closing devices, and particularly discloses a hydraulic-electric hybrid drive connecting rod type injection molding machine mold opening and closing device which comprises a head plate, a second plate, a tail plate, a mold and a power mechanism, a pull rod is arranged between the head plate and the tail plate, and the second plate is movably arranged on the pull rod between the head plate and the tail plate. The die comprises a fixed die fixed on the head plate and a movable die fixed on the second plate, the power mechanism is fixed on the tail plate and connected with the second plate, the power mechanism comprises a plunger cylinder, a servo motor, a ball screw and a hydraulic power unit, the ball screw and a plunger are integrated in a cylinder barrel, the plunger is driven to translate through rotation of the ball screw, and the hydraulic power unit is connected with the plunger cylinder. By means of the structure, the requirement for mold opening and closing control precision can be met, after mold closing, high-pressure oil can be introduced into a rodless cavity of the plunger type cylinder through the hydraulic power unit, the plunger is used for further driving the second plate to be attached to the head plate, the requirement for mold clamping force can be met, the integration degree is high, the overall occupied size is small, and cost is low.

The invention discloses a preparation method and application of a carbon-based single-atom oxygen reduction reaction electrocatalyst, using dopamine functionalized polypyrrole nanoparticles as a skeleton material, ethylenediaminetetraacetic acid and bipyridine as ligands, and forming a multi-level stable loaded complex with Fe-O and Fe-N coordination structure on the skeleton material through dynamic timing ligand regulation, gradual temperature increase and coordination time control, and then the obtained complex-loaded polypyrrole nanoparticles are subjected to 200-300°C low-temperature pre-calcination, corrosive gas etching and 500-900°C high-temperature step-by-step calcination treatment to stably generate FeN4 / Fe2O3 active site structure linked by N-Fe-O bridge bonds, and at the same time obtain a rich pore structure to optimize the contact between electrolyte and active site, and finally prepare a carbon-based single-atom oxygen reduction reaction electrocatalyst. The oxygen reduction reaction electrocatalyst prepared by the present invention exhibits excellent catalytic activity and catalytic stability.

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 provides a fiber multilayer composite air filtering material and a preparation method thereof. The fiber multilayer composite air filtering material comprises a fiber base material, a metal catalyst is loaded on the fiber base material, the surface of the fiber base material is covered with a nanofiber membrane, the fiber base material is composed of alkali-treated bamboo fibers and polymer fibers, and the nanofiber membrane contains an antibacterial agent and a silane coupling agent. The fiber multilayer composite air filtering material has the advantages of high catalyst loading capacity, excellent filtering efficiency, good mechanical strength and toughness and the like, the raw materials are wide in source, the process is simple and environment-friendly, and a new way is provided for development of multifunctional air filtering materials. The invention also provides a preparation method of the fiber multilayer composite air filtering material.

The application discloses a multifunctional antibacterial coating bone implant device based on a selective vacuum perfusion process and a preparation method thereof. The method comprises the following steps: 1) pretreating a titanium alloy base; 2) performing anodic oxidation treatment on the pretreated titanium alloy base to construct a nanotube structure on the surface of the titanium alloy base; 3) selectively coating the treated titanium alloy base with a hydrogel adhesive, then immersing the titanium alloy base in a povidone iodine mixed solution to perform vacuum perfusion, and performing post-treatment, then again performing selective coating, immersing the titanium alloy base in a solution containing a bone growth promoting factor to perform vacuum perfusion, and performing post-treatment, then again performing selective coating, immersing the titanium alloy base in a solution containing a blood vessel growth promoting factor to perform vacuum perfusion, and performing post-treatment; and 4) encapsulating the obtained sample surface with an in-situ self-polymerized polydopamine layer, washing and freeze-drying. The bone implant device has antibacterial, bone growth promoting and blood vessel growth promoting functions, and can greatly improve the curative effect on bone fracture symptoms accompanied by infection.

The utility model provides a kind of high torsional rigidity linear module, including base and the moving seat of along base sliding, the inner wall of base both sides is equipped with guide slide along its length direction, the both sides of moving seat are equipped with the auxiliary slide way extending along base length direction, auxiliary slide way is slidably connected with the first rolling chain and the second rolling chain formed by a plurality of ball string connection, first rolling chain and second rolling chain are arranged in parallel up and down, first rolling chain is close to base bottom, the ball on first rolling chain and second rolling chain is slidably contacted with auxiliary slide way and simultaneously with guide slide, the intersection point of the line of the contact point of the ball on first rolling chain with guide slide and the contact point of the ball on second rolling chain with auxiliary slide way is located in the outside of moving seat, the intersection point line of the line of the both sides of moving seat forms O type structure;The O type structure in the utility model can improve the torsional rigidity of module, can enhance the load capacity of linear module, to prolong the service life of linear module.

The application discloses a polyacid zeolite imidazolate framework loaded monatomic catalyst and a preparation method and application thereof, and belongs to the technical field of catalysts. The preparation method of the catalyst is as follows: (1) preparing a zeolite imidazolate framework material; (2) mixing the dried zeolite imidazolate framework material and a metal salt in a solvent and stirring; then adding a heteropoly acid, controlling the pH in the system to be 5-7, and performing a solvothermal reaction under the condition of 80-120 DEG C; after the reaction is completed, cooling and centrifugal separation are performed to obtain a precipitate; and (3) performing calcination treatment on the precipitate to obtain the polyacid zeolite imidazolate framework loaded monatomic catalyst. The polyacid zeolite imidazolate framework loaded monatomic catalyst prepared by the method has high catalytic activity, high selectivity and good cycle stability, and has a good application prospect in acetyl propionate esterification reaction.

The present application relates to the field of white oil, and specifically to a white oil for mosquito coil liquid and a preparation method thereof. A preparation method for white oil for mosquito coil liquid comprises the following steps: Step 1: adding raw materials to a hydrogenation reactor, and the mixed materials and hydrogen pass through a first catalyst bed and a second catalyst bed to undergo a hydrogenation reaction to obtain a primary product; Step 2: subjecting the primary product to multiple oil-gas separations, and the oil phase obtained by separation is the product; the first catalyst bed and the second catalyst bed are filled with a modified catalyst; the preparation method for the modified catalyst comprises the following steps: Step a: preparing a carrier; Step b: loading a precious metal. The white oil obtained by the preparation method of the present application is specially designed for electric mosquito coil liquid for mothers and infants, improves the quality of the white oil, gives the electric mosquito coil liquid moderate volatility, and effectively enables each component in the mosquito coil liquid to fully exert the mosquito repellent effect.

The invention discloses a solar water evaporation adsorption material as well as a preparation method and application thereof, and belongs to the technical field of wastewater treatment. Stirring and reacting the polydopamine modified zeolite imidazate framework material with the pre-oxidized nano cellulose solution and the polyvinyl alcohol solution to form a viscous liquid, transferring the viscous liquid into a mold, and sequentially performing standing and bubble removal, freeze forming and freeze drying to obtain the polydopamine modified zeolite imidazate framework material. The solar water evaporation adsorption material is formed by a zeolite imidazate framework material which is formed by the pre-oxidized nanocellulose and the polyvinyl alcohol and is modified by loading polydopamine on a dual-network structure. The composite material has the characteristic of high stability, is endowed with a photo-thermal conversion function and rare earth ion adsorption activity at the same time, can promote water evaporation and accelerate mass transfer of rare earth ions in an aqueous solution and combination of adsorption active sites by utilizing solar radiation so as to accelerate adsorption kinetics of the rare earth ions, and can be used for rare earth wastewater treatment. The method is especially suitable for low-concentration rare earth wastewater treatment.

The invention belongs to the technical field of winch control, and discloses a winch brake control system and method, and the system is characterized in that a winch brake is connected with a hydraulic control reversing valve through a pipeline; the hydraulic control reversing valve is in pipeline connection with the oil pump through an oil supply branch, the hydraulic control reversing valve is in pipeline connection with the oil tank through an oil return branch, and the oil pump is further connected with the oil tank through a pipeline; the hydraulic control reversing valve is used for controlling the on-off of the oil feeding path and the oil returning path; the hydraulic control pilot end of the hydraulic control reversing valve is connected to the lifting control device; the torque compensation unit is connected with the spring end of the hydraulic control reversing valve, the torque compensation unit is in communication connection with the controller, the controller is in communication connection with the tension sensor, and the tension sensor is used for detecting the tension of a heavy object acting on the steel wire rope. When the load weight is heavy, brake unlocking is delayed, and the problem of heavy-load hook slipping is solved.

According to the radioactive hydrogel and the preparation method and application thereof and the radioactive tumor treatment application, chitosan serves as a matrix and is crosslinked with genipin to construct a three-dimensional network, and stable loading and slow release of radionuclides can be synchronously achieved; the self-antibacterial and adhesion characteristics of the patch can reduce the infection risk and ensure the fixation of the patch, so that a safe, effective and easy-to-operate local treatment platform is provided, the prepared patch can be directly placed on a tumor bed after resection in an operation, beta or alpha rays released by radionuclides accurately and continuously act on an area where tumor cells are most likely to remain, and the effect of treating the tumor cells is achieved. Different from traditional external radiation radiotherapy, the hydrogel can continuously release radiation with a low dosage rate. The mode has a stronger biological effect (such as inhibition of reproliferation) on tumor cells, the radiosensitivity difference of different cell periods and time phases can be overcome, the killing effect is more thorough, and chitosan is proved to have certain antibacterial activity, tumor cell growth inhibition activity and immunomodulatory activity. A synergistic effect can be generated with radionuclide, and a microenvironment which is not beneficial to survival and relapse of tumor cells is constructed together with the radionuclide.

The application discloses a cellulose cross-linked carbon sponge / MXene composite material and a preparation method and application thereof, and belongs to the technical field of noble metal resource recovery and functional adsorption materials. x MXene nanosheets are used as a functional component, and cellulose nanofilaments are introduced as an interface cross-linking agent. The composite material utilizes the synergistic effect of nitrogen coordination sites in the CMS and low-valence titanium active sites in the MXene, realizes efficient adsorption and in-situ reduction of Au(III), exhibits good selectivity for Au(III) in a complex multi-ion system, and is suitable for the recovery of noble metal ions in a complex system such as electronic waste leaching liquid.

The invention relates to the technical field of ink-jet printing, and discloses an ink-jet printing mechanism, a control method and an ink jet printer, and the ink-jet printing mechanism comprises a transmission platform which is provided with a transmission guide belt, and the transmission guide belt sleeves a driving roller and a driven roller; the driving assembly is connected with the driving roller; the driving assembly is used for driving the driving roller to rotate; the compensation assembly is connected with the driven roller; the compensation assembly is used for driving the driven roller to rotate; and the driving assembly is in communication connection with the compensation assembly, so that in the transmission process of the transmission conduction band, the output torque generated by the driving assembly is within a preset range. According to the embodiment of the invention, by arranging the compensation assembly, load compensation can be carried out on the driving assembly according to the actual load variation of the driving assembly, so that the load borne by the driving assembly can be kept stable. Therefore, the transmission guide belt does not generate deformation quantity, so that the color channels can be accurately aligned during color overlapping.

The invention discloses a pH-responsive supramolecular salicylic acid nanogel and a preparation method and application thereof, and the pH-responsive supramolecular salicylic acid nanogel comprises the following preparation raw materials by mass: 3-30% of salicylic acid; 0.6 to 1.5 percent of orthoester; 30 to 50% of poloxamer; 0.5 to 5.0 percent of polyhydric alcohol; 0.5-1% of a surfactant; and the balance solvent. Through supramolecular design, salicylic acid molecules and a precursor containing a pH sensitive group (orthoester) are integrally constructed into a nanogel network through non-covalent self-assembly, so that the contradiction between solubility and irritation of high-concentration salicylic acid is fundamentally solved; the prepared pH-responsive supramolecular salicylic acid nanogel can realize the synergistic effects of stable loading of high-concentration salicylic acid, targeted response release of an inflammatory site and low skin irritation, and the preparation process is simple, convenient and environment-friendly, is suitable for industrial production, and has a wide application prospect in the field of functional skin care products.

The invention belongs to the technical field of medical dressings, and relates to a DNA hydrogel dressing with a skin-like structure and function as well as a preparation method and application of the DNA hydrogel dressing. The dressing is structurally characterized in that a skin-like three-layer structure, namely an epidermal layer, a corium layer and a subcutaneous tissue layer, is constructed by regulating and controlling the cross-linking degree of chain segments and combining a directional freezing technology, and an extracellular matrix microenvironment is provided for physiological activities of cells. In function, an aptamer sequence with a specific function is introduced, and stem cells are induced to directionally differentiate into cells required by tissue repair; the subcutaneous tissue-like layer is loaded with resveratrol, and fascia is activated to induce regeneration of skin appendages; in view of the fact that chronic ulcerative wounds are easily attacked by bacteria, the antibacterial peptide and a functional DNA sequence of targeted bacteria form an antibacterial peptide-DNA composite chain segment through a click reaction, and the dressing is endowed with targeted antibacterial performance. The prepared dressing has a skin-imitating three-dimensional structure and performance, can guide skin appendages such as regeneration of hair follicles and sweat glands, and can be widely applied to repair treatment of chronic wounds.

The present application relates to the field of sewage treatment, and specifically discloses a method for electrochemical anode-cathode synchronous removal of nitrogen and phosphorus and recovery of struvite. The specific method is to use a double electrode system, the anode is a magnesium anode, and an oxidation reaction occurs at the anode to produce Mg 2+ ; Reduction reaction occurs at the cathode, specifically NO3 ‑ Reduced to NH4 + Mg 2+ NH4 + The phosphate in the system generates struvite under alkaline conditions. The present invention develops a new wastewater treatment resource technology, which can simultaneously achieve the effective removal and resource recovery of nitrate nitrogen and phosphate in wastewater. The present invention organically combines the cathode and anode of the electrochemical system to achieve the simultaneous removal and recovery of nitrogen and phosphorus in wastewater, providing a new idea for achieving carbon neutrality technology in wastewater treatment.

This invention discloses a piezoelectric self-renewing gradient ceramic catalytic membrane and its preparation method, belonging to the field of porous ceramic technology. The method includes the preparation of a porous piezoelectric ceramic substrate, LDH transition layer modification, and catalyst electrophoretic deposition. The catalyst electrophoretic deposition method involves dispersing the catalyst in a solvent, adjusting the suspension to make the catalyst particle surface positively charged, obtaining a catalyst suspension; using a ceramic substrate modified with a positively charged transition layer as the cathode and a graphite rod as the anode, immersing both electrodes in the catalyst suspension, controlling the distance between the two electrodes to 1.4-1.6 cm, connecting a constant voltage DC power supply of 20-40V, and depositing for 5-15 minutes. After deposition, the sample is removed and subjected to post-processing and polarization treatment to obtain the catalytic ceramic membrane product. This invention utilizes fluid pressure fluctuations to excite the piezoelectric effect, achieving in-situ mechanical exfoliation and self-renewal of catalytically activated and surface-deactivated catalysts, significantly improving catalytic efficiency and long-term stability.

The invention provides a preparation method of an ethylene epoxidation Ag / SiC catalyst, which comprises the following steps: step 1, treating SiC powder with acid, and then treating the SiC powder with alkali to obtain a SiC precursor; step 2, mixing the SiC precursor, a pore-forming agent and an auxiliary agent, molding, and carrying out heat treatment to obtain a SiC molded carrier; step 3, loading a silver precursor on the SiC molding carrier to obtain an ethylene epoxidation Ag / SiC catalyst; wherein the acid comprises fluorine-containing acid and at least one inorganic acid except the fluorine-containing acid, and the alkali is an amine compound. The silicon carbide is subjected to acid erosion treatment, so that the surface roughness of the silicon carbide can be improved, the loaded metal particles are fixed on the surface of the SiC carrier, migration and agglomeration of active component Ag ions in the reaction process are reduced, and the stability of the Ag / SiC catalyst is improved.