84results about How to "Raise the potential" patented technology

The invention discloses an equipment fault intelligent question-answering method and system based on knowledge graph enhancement. The method comprises the following steps: constructing a knowledge graph of a professional field; developing a natural language processing module; designing an enhanced generation model; designing an interactive question and answer interface; the system comprises a user interaction layer, a language understanding processing layer, a knowledge graph query reasoning layer, a question and answer generation layer and a data storage management layer. Through the natural language processing technology, the system can quickly understand the query intention of a user, and the manual information input and interpretation time in traditional fault diagnosis is shortened, so that the overall fault response speed is increased; the large language model has deep learning and generalization capabilities, various complex and unknown fault conditions can be processed, accurate diagnosis and operation suggestions are provided, and the potential capability of the system for processing new fault types is enhanced.

The invention relates to the technical field of oil exploration and development, and particularly provides a numerical simulation method for CO2 storage and oil displacement development effect evaluation. The method comprises the following steps: constructing a flow state physical model after CO2 enters a reservoir; according to the flow state physical model, a seepage model of CO2 entering the reservoir is established by combining the Darcy seepage theory and the mass conservation theory, and an oil phase formula, a water phase formula and a CO2 gas phase formula are obtained in a radial one-dimensional cylindrical coordinate system; dividing a calculation area into differential grids according to an oil phase formula, a water phase formula and a CO2 gas phase formula to obtain a limited number of grid nodes, and replacing a continuous solution domain with the limited number of grid nodes; according to the solution domain, calculating to obtain a relation expression of CO2 saturation changing along with radius and time; a prediction model is formed through the change relational expression, the CO2 storage or oil displacement state is predicted, the CO2 storage and oil displacement process is accurately simulated, and the CO2 emission reduction effect and potential can be effectively improved.

The invention provides a high-magnetic-induction-intensity non-oriented silicon steel thin strip for an automobile driving motor and a manufacturing method of the high-magnetic-induction-intensity non-oriented silicon steel thin strip, and belongs to the technical field of electrical steel manufacturing. (2) carrying out smelting and RH vacuum treatment according to the components; (3) carrying out normalizing pickling treatment on a hot-rolled coil in a pure nitrogen protective atmosphere; (4) rolling into a cold-rolled coil with the thickness of 0.10-0.30 mm by adopting a secondary cold rolling method; (5) recrystallization annealing is conducted at the temperature of 950-1050 DEG C in the H2 atmosphere (the ratio of H2 to N2 is larger than 1.2: 1), and (6) annealing is conducted on an annealed coil in a bell-type furnace, total magnetic field annealing is increased, the magnetic field intensity is 1.5 T, the annealing temperature is 760 DEG C, cooling is conducted after heat preservation is conducted for 1.5 h, and the non-oriented silicon steel thin strip with the medium-frequency iron loss P1.0 / 400 being 6-12 W / kg, the magnetic induction B5000 being 1.69-1.73 T, the yield strength Rp0.2 being 450-520 Mpa and the excellent performance is obtained. The steel grade developed by the invention can simultaneously meet the non-oriented silicon steel thin strip for the automobile driving motor, which has extremely high requirements on medium-frequency iron loss, magnetic induction and strength and extremely excellent comprehensive performance.

The invention relates to the technical field of aquaculture, in particular to a carboxyl fluorescent quantum dot loaded gene editing system and application thereof in aquatic animal gene editing. The invention provides a preparation method of a carboxyl fluorescent quantum dot loaded gene editing system, which comprises preparation of functionalized carboxyl fluorescent quantum dots and connection of the functionalized carboxyl fluorescent quantum dots and plasmid DNA to obtain the carboxyl fluorescent quantum dot loaded gene editing system, and the carboxyl fluorescent quantum dot loaded gene editing system can be subsequently used for aquatic animal fertilized egg gene editing or cell transfection. According to the method, safe and efficient egg shell digestive enzymes and nano materials are used for gene editing breeding of aquatic animals.

The invention provides a carbon-manganese-based composite material as well as a preparation method and application thereof. The carbon-manganese-based composite material is a MnO2-BC composite material formed by MnO2 and biochar, and MnO2 nanoparticles are loaded on the surface of the biochar; by adding 60mg of MnO2-BC / g.VS into a WAS anaerobic fermentation system, the anaerobic fermentation performance of the WAS can be greatly improved, and the degradation rates of polysaccharide, protein and SCOD (soluble chemical oxygen demand) are improved; the method can promote the directional enrichment of Desulfovibrio and Geobacter from the angles of energy metabolism regulation and electron directional transduction optimization, stably and efficiently solves the bottleneck problems of easy acid accumulation, poor flora synergistic effect, easy environmental stress in methane production and the like in the traditional WAS anaerobic fermentation, and has excellent application potential.

The invention discloses a waste lithium battery electrode recycling and regenerating method which comprises the following steps: (1) crushing a waste lithium battery electrode and carrying out acid leaching with sulfuric acid, hydrochloric acid or phosphoric acid to obtain an acid leaching solution; (2) adding 1.2-2.0 equivalent weight of iron powder into the pickle liquor according to the molar weight of copper ions in the pickle liquor under the protection of inert gas, reacting for not less than 30 minutes, adjusting the pH value to 1.5-2.0 by using ammonia water, and filtering to obtain a first impurity-removed solution; (3) adding not less than 0.05% of an antioxidant into the first impurity-removed solution by mass, adjusting the pH value to 2.6-3.5 by using ammonia water, and filtering to obtain a second impurity-removed solution; and (4) adding a manganese-containing composition into the second impurity-removed solution, and heating to 90-100 DEG C, so that ferrous ions are separated out in the form of lithium manganese iron phosphate double salt, and the precipitate is the regenerated electrode material. Impurities in the electrode are removed and recycled in a non-oxidation mode, the technological process is shortened, high-temperature and high-pressure conditions are not needed, and the preparation process is milder.

The invention discloses a mulberry linder hyphae tea bag with mulberry leaf and Fuzhuan tea as fermentation material and a preparation method thereof, and the preparation method steps are as follows: S1: activating the mulberry linder bevel mother species and inoculating it into a solid culture medium, and optimizing the quality under the stimulation of high and low concentration difference of inorganic selenium and the stress of mulberry leaf and Fuzhuan tea steaming extractant; S2: inoculating the mulberry linder hyphae mother species into a solid-liquid mixed fermentation agent culture medium for fermentation and culturing under the dual effects of low-solubility inorganic selenium stress and mulberry leaf and Fuzhuan tea golden flower fungus steaming extractant protection stimulation; S3: inoculating the mulberry linder solid-liquid mixed fermentation agent into the bagged pure mulberry leaf and Fuzhuan tea optimized fermentation material sterilized at high temperature under a sterile environment, and then moving it into a solid-state fermentation room for constant temperature, constant humidity and low carbon dioxide for culturing; S4: preparation of mulberry linder hyphae tea bag. The invention fundamentally solves the problems of bitter taste, poor taste, and difficulty in long-term storage in the existing mulberry leaf and Fuzhuan tea, and the prepared mulberry linder hyphae tea bag has better health care effect.

The invention relates to the technical field of medicine, in particular to a preparation method and application of a photodynamic-chemotherapy nano platform targeting tumor endogenous YAP1. The nano platform is hollow mesoporous silica nanoparticles (M (at) O-VNPs) loaded with oxaliplatin and VP of a macrophage membrane coating. The preparation method comprises the following steps: S1, synthesizing hollow mesoporous silica nanoparticles; s2, preparing the organic silicon nanoparticles loaded with the Verteporfin, and preparing the organic silicon nanoparticles loaded with the Verteporfin; s3, loading of the oxaliplatin; and S4, extraction and coating of a macrophage membrane. According to the invention, the macrophage membrane wrapped on the surface of the nano platform is utilized to provide good tumor targeting for the M (at) O-VNPs, and by camouflaging the macrophage membrane and the M (at) O-VNPs, not only are recognition and removal of an organism immune system successfully avoided, but also Verteporfin (VP) and oxaliplatin (OXA) can be delivered to a tumor site in a targeting manner, so that the tumor targeting of the drug is remarkably enhanced, and the drug has a good application prospect. The non-specific distribution in healthy tissues is reduced, and the systemic toxicity is reduced.

The invention discloses a synthetic method of a piperidine nitroxide free radical compound formed by connecting an aromatic heterocyclic ring and an aliphatic heterocyclic ring, a derivative of the piperidine nitroxide free radical compound, a positive electrode electrolyte based on the piperidine nitroxide free radical compound and application of the piperidine nitroxide free radical compound in a flow battery. A series of TEMPO nitroxide free radical derivatives in which aromatic heterocycles and fat heterocycles are connected in a substituted manner are prepared and tested by adjusting amino or hydroxyl chains on the 4-site of cyclic nitroxide free radicals to be connected with different aromatic heterocycles and fat heterocycles, the connected substituted heterocycles form extended TEMPO compounds, the conjugation degree of the extended TEMPO compounds is increased, the molecular structure can be well stabilized, and the molecular structure can be used for preparing the TEMPO nitroxide free radical derivatives. Disproportionation-dimerization and secondary ring-opening reaction of a cyclic nitroxide free radical structure are inhibited, and the stability is improved, namely the cycle life of the battery is prolonged and the capacity of the battery is increased. The invention provides a new strategy for constructing a high-performance neutral aqueous organic flow battery, and can be suitable for large-scale energy storage.

The invention discloses a polylactic acid-based nanofiber membrane as well as a preparation method and application thereof, and belongs to the technical field of air filtering membrane materials, fibers of the polylactic acid-based nanofiber membrane provided by the invention are formed by compounding an electroactive heterostructure layer and a dextrorotation polylactic acid layer, and the electroactive heterostructure layer is formed by a levorotation polylactic acid layer, an electret and a nucleating agent. According to the polylactic acid-based nanofiber membrane prepared by the preparation method disclosed by the invention, the PMs filtering efficiency reaches 99.0%-99.99%, the surface potential is maintained at 12 kV to 18 kV, the breathing resistance is 90 Pa to 180 Pa, the antiviral efficiency is 99.0%-99.98%, and the bacteria filtering efficiency is 99.2%-99.98%. According to the invention, the electroactivity and hydrophobicity of the nanofiber membrane are enhanced by combining a polylactic acid interface stereochemical compound with an electroactive heterostructure, so that the nanofiber membrane has the characteristics of fouling resistance (microorganisms, blood, dyes and the like) and high air filtration performance.

The invention relates to a variable-density high-vacuum multi-layer heat insulation structure and an optimization method thereof, and the optimization method comprises the following steps: determining design parameters and performance indexes of the variable-density high-vacuum multi-layer heat insulation structure, and carrying out the functional expression of each performance index based on the design parameters, so as to obtain a simulation function of each performance index; and based on the simulation function of each performance index, establishing an optimal arrangement problem of the variable-density high-vacuum multi-layer heat insulation structure, and solving the optimal arrangement problem by adopting a genetic algorithm to realize optimization of the variable-density high-vacuum multi-layer heat insulation structure. When the genetic algorithm is adopted to solve the optimal arrangement problem, population individuals are generated based on the number of heat insulation layers among all reflecting screens of the variable-density high-vacuum multi-layer heat insulation structure, and a heat flow density function of the variable-density high-vacuum multi-layer heat insulation structure serves as a fitness function. Compared with the prior art, the method has the advantages of effectively improving the heat insulation performance, being high in efficiency and the like.

The invention belongs to the technical field of water treatment materials, and particularly relates to a coal gasification slag unfired ceramsite filter material as well as a preparation method and application thereof. The coal gasification slag thermal insulation material comprises the following raw materials in parts by weight: 67.5-95 parts of coal gasification slag, 5-15 parts of active powder, 0-20 parts of metakaolin, 2-8 parts of expanded perlite, 0.1-0.5 part of a foam stabilizer and 1-3 parts of a foaming agent. The unfired ceramsite filter material has the advantages of being reusable, green and environment-friendly in preparation process, low in follow-up treatment cost, capable of being reused after failure and the like.

The invention provides a chip test system and a test method thereof. The test system comprises a test machine, a switch circuit and a bias power supply. The bias power supply is introduced between the to-ground reference end of the chip to be tested and the power ground of the test system, so that the potential of the to-ground reference end of the chip to be tested relative to the power ground is improved, and a voltage difference exists between the grounding end of the test machine and the to-ground reference end of the chip to be tested; therefore, the testing machine can perform reverse testing on the electronic component in the chip to be tested without a negative voltage power supply, and the cost of the testing machine is reduced. Meanwhile, the switching circuit is arranged between the grounding end of the testing machine and the ground reference end of the chip to be tested, and the voltage difference between the ground reference end and the grounding end of the chip to be tested is controlled by controlling the switching circuit to be switched on and switched off, so that the testing structure can meet different requirements of contact testing and high-speed data transmission testing.

The invention discloses a hot rolled steel coil for a supercritical carbon dioxide conveying pipeline and a production method of the hot rolled steel coil. The steel coil comprises the following chemical components in percentage by weight: 0.03 to 0.05 percent of C, 0.10 to 0.30 percent of S i, 1.20 to 1.40 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 0.030 to 0.050 percent of Nb, 0.005 to 0.020 percent of T i, 0.20 to 0.40 percent of Cr, 0.10 to 0.25 percent of N i, 0.020 to 0.050 percent of Al and the balance of Fe and inevitable impurities. The Nb-Ti-Cr-Ni alloy components and the TMCP rolling technology are adopted, the thickness of a steel coil is 10-15 mm, the steel coil has good strength, low-temperature toughness and carbon dioxide corrosion resistance, the impact energy at the temperature of-60 DEG C is larger than 300 J, the corrosion rate is smaller than 0.125 mm / a, and the requirement for the steel for the supercritical carbon dioxide conveying pipeline is completely met.

The invention relates to application of icariin in preparation of a medicine for treating ovarian reserve function decline diseases. The ovarian reserve function decline disease is infertility caused by ovarian reserve function decline. It is found through experiments that icariin improves the number of DOR mouse sinus follicles; the effect of icariin on the hormone level of a DOR mouse; the influence of icariin on DOR mouse ovarian apoptosis; the influence of icariin on the ovary mitochondrial function of the DOR mouse; icariin (ICA) can be used for increasing the proliferation of ovarian granular cells induced by CTX; icariin can improve the mitochondrial function; the icariin can improve the mitochondrial membrane potential and reduce the generation of active oxygen. The traditional Chinese medicine monomer icariin has a considerable clinical application prospect in improvement of mouse ovarian reserve function decline.

The present invention relates to anti-htra1 antibodies and methods of preparing and using them, for example, in methods of treating disorders associated with htra1, ocular disorders, and / or disorders associated with the complement system.

This invention discloses a low-temperature resistant, high-power aqueous organic-bromine battery, belonging to the field of electrochemical energy storage technology. The invention uses a low-freezing-point bromine-based salt solution with added bromine solid complexing agent as the electrolyte, and a pseudocapacitive organic material as the negative electrode, which possesses ionic universality and can bind metal ions in the solution during the reaction. The positive electrode uses a carbon material as a substrate, where a bromine redox reaction occurs. Simultaneously, the complexing agent can complex bromine in solid form onto the carbon surface, ensuring good stability at both room temperature and low temperatures. The aqueous organic-bromine battery of this invention exhibits high energy density and ultra-high power density at room temperature, maintains high energy density even at low temperatures, and is inexpensive, showing promising application prospects.

The invention belongs to the technical field of anti-tumor drugs, and particularly relates to application of allicin in preparation of an anti-tumor drug sensitizer and a tumor chemotherapy pharmaceutical composition, an A549 cell strain, a paclitaxel drug-resistant cell model A549 / Taxol and a tumor-bearing mouse model are established, and in-vivo and in-vitro pharmacodynamic research finds that the allicin can effectively inhibit cell proliferation and has a good anti-tumor effect. The apoptosis is induced, and the drug resistance of paclitaxel is reversed. The compound inhibits P-gp expression, reduces drug efflux and destroys cell autophagy. Particularly, allicin inhibits cathepsin B (CTSB), destroys lysosome functions, blocks autophagy flux, reduces mitochondrial membrane potential and enhances sensitivity to paclitaxel. The combination of allicin and paclitaxel can significantly inhibit the growth of tumor nodules and reduce the number of tumor nodules, shows the potential of reversing the drug resistance of paclitaxel in vivo, can significantly improve the chemotherapy effect of NSCLC, and has potential clinical application value.

The application discloses a method for inducing T cell reprogramming into NK-like cells, comprising the following steps: (1) culturing the T cells in a culture system to obtain activated T cells; (2) adding small molecule inducers twice to the activated T cells to obtain NK-like cells; wherein the culture system in step (1) contains 1-10 v / v % serum substitute and / or platelet lysate, and does not contain fetal bovine serum. By optimizing the culture process and precisely adding drugs twice, the small molecule accumulation toxicity caused by multiple drug additions is avoided, the damage to the structure and function of the mitochondrial membrane is reduced, the mitochondrial membrane potential is significantly improved, the energy metabolism capacity of the mitochondria is enhanced, sufficient energy support is provided for the long-term survival and function maintenance of the cITNK cells, and the physiological activity of the cells is ensured from the energy metabolism level.

The invention discloses a drilling process state monitoring method based on interval information granulation, and relates to the technical field of geological drilling engineering.The drilling process state monitoring method based on interval information granulation mainly comprises the steps that original drilling process data is preprocessed to obtain a drilling data time sequence; performing multi-interval information granulation on the drilling data time sequence to obtain a low-dimension time sequence; according to the low-dimension time sequence, a drilling operation state monitoring model is obtained through a principal component analysis method with a kernel function; and monitoring the drilling operation state by using the drilling operation state monitoring model. According to the drilling process state monitoring method based on interval information granulation, the operation state of the drilling system can be finely monitored and sensitively sensed.

The application discloses the technical field of electroplating wastewater treatment high-value metal recovery system for electroplating wastewater, including electrolytic cell and electrolytic mechanism, electrolytic cell is connected with infusion tube, infusion tube is connected with electronic flowmeter, electrolytic cell top is detachably connected with cover body, cover body is provided with observation ring groove, cover body is fixedly connected with camera unit; The inside lower side of the electrolytic cell is provided with a sedimentation plate and a stirring unit, the sedimentation plate is in sliding fit with the inner side wall of the electrolytic cell, the bottom of the electrolytic cell is fixedly connected with a first weighing sensor, and the detection end of the first weighing sensor is in abutment with the bottom of the sedimentation plate; The electrolytic mechanism includes a controller, a driving unit, an adjusting unit and an electrolytic unit. The application reduces the generation of concentration polarization and activation polarization phenomenon in the process of electroplating wastewater metal treatment and recovery, recovers the wastewater metal in an efficient state, estimates the treatment and recovery effect of the wastewater metal, and improves the qualified rate of wastewater metal treatment and recovery.

The invention discloses a visual programming method and system and a storage medium, and belongs to the technical field of game editing.A mixed programming method of main process visual nodal and node parameter scripting is adopted, a main process tree is constructed through visual nodes, node parameter scripting is achieved in cooperation with a user-defined script language zScript, main logic and parameter details are separated, and the main process visual nodal and node parameter scripting efficiency is improved. Nodes on the graph are fewer and simplified, the main process is free of interference of parameter details, the information amount is greatly reduced, the main process is higher in readability, the problems that traditional visual programming is poor in readability and bug checking is difficult are solved, a user-defined script language zScript is matched with an intelligent coding window, and compared with a dragging mode in the prior art, when complex logic details are constructed, the method has the advantages that the complexity is reduced, and the efficiency is improved. The research and development efficiency is higher, and logic construction requirements of non-program and program personnel can be considered.

The invention discloses a ferroelectric capacitor modeling method oriented to circuit simulation. The method comprises the following steps: 1, modeling a ferroelectric capacitor; the method comprises the following steps of: 1, correcting a node analysis method to enable MNA to be in modeling connection with an MNA model of Fcap; and step 2, an MNA model forming process of the Fcap element: based on the MNA, using an L-K model formula of the Fcap to obtain a compensation equation and an equation used for solving unknown variables, obtaining a final admittance matrix G and a known vector column RHS of the Fcap element, and obtaining an MNAmodel of the Fcap. According to the method, on the basis of the MNA, unknown variables are represented by utilizing a physical model formula of the Facap, the Kirchhoff current law and the Kirchhoff voltage law, and model codes of the Facap are formed, so that SPICE simulation of the Facap is more accurate and quicker.

Provided is an information processing device for generating tree structure model data to be used for machine learning based on data for generating a tree structure model including one or more pieces of input sequence data, including a statistic identifying unit that identifies a statistic for each piece of the input sequence data; and a tree-structure-model-data generation unit that sets a splitting value for each node of a tree structure model based on the statistic, thereby generating tree structure model data.

The invention belongs to the technical field of power systems, and discloses a power distribution network area demand response capability evaluation method and system, and the method comprises the steps: obtaining the current operation state of a power distribution network, and determining the type of the operation state of the power distribution network according to the current operation state of the power distribution network; determining a demand response potential evaluation index of the power distribution network according to the operation state category of the power distribution network; calculating an index score of each demand response potential evaluation index of each transformer area; according to the demand response potential evaluation index and the index score of the current time period, calculating a demand response potential comprehensive score of each transformer area; and according to the demand response potential comprehensive score of each transformer area of the power distribution network in the current time period, grading the transformer area demand response potential to obtain a demand response potential grading evaluation result. The potential and capability of participating in demand response of the power distribution network in the novel power system are rapidly enhanced, the method can be applied to the field of power systems, and the efficiency and scientificity of demand response scheduling decision making of the power distribution network in the power system are improved.

The present invention relates to a 690MPa grade low temperature corrosion resistant steel for frozen soil roads, which belongs to the technical field of corrosion resistant steel and solves the problem that high strength steel in the prior art cannot meet the low cost and high performance requirements of high strength frozen soil road steel. The low temperature corrosion resistant steel comprises: C: 0.05-0.12%, Si: 0.30-0.50%, Mn: 1.50-1.80%, P: 0.002-0.02%, S: ≤0.005%, Cu: 0.05-0.55%, Cr: 0.1-0.8%, Ni: 0.5-3.0%, V: 0.02-0.08%, Nb: 0.010-0.02%, N: 0.003-0.020%, Al≥0.015%, La+Ce≤0.05%, and the balance is Fe and unavoidable impurities. The 690MPa grade low temperature corrosion resistant steel for frozen soil roads of the present invention is suitable for high strength frozen soil road steel.

The invention relates to the technical field of gene engineering detection, and particularly discloses a gene detection system for promoting andrographolide synthesis based on a biosensor, a key gene ApDof29 for regulating and controlling andrographolide synthesis is determined through whole genome analysis, gene expression profile research and co-expression network analysis, the core regulation and control effect of ApDof29 is verified, and the gene detection system for promoting andrographolide synthesis based on the biosensor is used for promoting andrographolide synthesis. The invention also develops a real-time dynamic monitoring system, and realizes non-invasive monitoring of andrographolide content accumulation, biosynthesis rate and metabolic intermediate concentration change by utilizing the fusion of a specific response element and a reporter gene. Through comprehensive calculation processing of an accumulation abnormal coefficient, a synthesis rate abnormal coefficient and a concentration change abnormal coefficient, the regulation and control effect of ApDof29 is dynamically evaluated, and a scientific basis is provided for subsequent gene modification.

The application provides an edible active coating for preventing dry consumption under an ultralow temperature condition and a preparation method, and belongs to the technical field of active packaging. The application combines double-layer coatings, inhibits free radical oxidation generated by freezing through an inner antioxidant, and effectively locks water and blocks external oxygen permeation through the synergistic effect of an outer high-barrier structure, thereby significantly improving the freezing preservation effect of food, and the raw materials are natural and safe, the preparation method is reasonable, and the application has good practical application value. The application solves the problems of poor effects of edible freezing protection coatings suitable for extremely cold environments in the prior art.

The application discloses a small-molecule peptide and application, relates to the technical field of bioactive peptides, and aims to provide a new anti-inflammatory small-molecule peptide. The amino acid sequence of the small-molecule peptide is phenylalanine-leucine-leucine-proline-arginine (FLLPR). The application can significantly inhibit the overproduction of NO and ROS in macrophages induced by lipopolysaccharide, effectively reduce the release of proinflammatory cytokines interleukin-6 and interleukin-1 beta, and can be used for preparing a medicine for preventing, relieving or treating inflammation induced by lipopolysaccharide.

The invention discloses a method for preparing a biological fresh-keeping agent by utilizing feather degradation liquid through probiotics and application of the biological fresh-keeping agent in litchi fresh-keeping. The method comprises the following steps: degrading feathers through bacillus cereus to obtain a feather degradation liquid, and inoculating lactobacillus helveticus for fermentation to obtain a fermentation liquid as a biological fresh-keeping agent; the picked litchi pericarp sprayed with the biological fresh-keeping agent is browned in the fourth day, while the litchi pericarp of a control group (sprayed with water) is completely browned in the first day, which indicates that the biological fresh-keeping agent has a fresh-keeping effect on the picked litchi, which may be active oligopeptides, bacteriostatic, antibacterial and antioxidant metabolites generated in the feather degradation and lactobacillus helveticus fermentation process, and can be used as a fresh-keeping agent for the picked litchi. The lychee extract has an inhibition effect on pathogenic bacteria causing browning of lychee and oxidase activity, and has the potential of retarding water loss of the pericarp. Therefore, the feather degradation liquid-based lactobacillus helveticus fermentation liquid obviously prolongs the shelf life of the picked litchis.