164results about How to "Reduce the difficulty of extraction" patented technology

The invention discloses a composite wavelength reference-based fiber bragg grating sensing demodulation device and method. The composite wavelength reference-based fiber bragg grating sensing demodulation device includes a broadband light source (1), a tunable FP filter (2), an optical fiber primary beam splitter (3), an optical fiber circulator (4), an optical fiber grating sensing array (5), a first optical fiber secondary beam splitter (61), a second optical fiber secondary beam splitter (62), an optical fiber air chamber (7), an optical fiber FP etalon (8), a notching filter (9), a photoelectric detection array (10), a data acquisition card (11) and a processing unit (12); and the composite wavelength reference-based fiber bragg grating sensing demodulation device further comprises a sensing link and a wavelength reference link. Compared with the prior art, and according to the composite wavelength reference-based fiber bragg grating sensing demodulation device and method of the invention, equal-interval reference wavelengths can be provided by the optical fiber FP etalon, and therefore, advantages of high fineness of transmission peaks, easiness in peak finding and wide wavelength coverage range can be realized; absolute reference wavelengths provided by the optical fiber air chamber are not affected by environmental factors such as temperature, vibration and impact; and stable fiber bragg grating demodulation is realized.

The invention mainly belongs to the technical field of pyrogenic process-hydrometallurgy and particularly relates to a method for selectively leaching scandium and sodium from bayer red mud. By the adoption of the method, the scandium, a rare and expensive metallic element, and sodium high in content can be leached from the red mud, and separation of the scandium and the iron element in the red mud can also be achieved. According to the method, based on the occurrence form of the scandium in the red mud, the bayer red mud is evenly mixed with concentrated sulfuric acid, after low-temperature sulphating is conducted, medium-temperature calcinating is conducted, and escaping sulfur trioxide and sulfur dioxide or sulfuric acid are recycled during sulphating and medium-temperature calcinating; and after sulfate impurities are decomposed, a washing liquor rich in the scandium and the sodium and low in iron content is obtained through water leaching. The washing liquor, prepared through the method, rich in the scandium and the sodium and low in iron content provides absolute advantages for the follow-up steps of ion exchange and solvent extraction and re-extraction; and after solid-liquid separation, the obtained leaching residues high in iron content and low in sodium content can be used as a building material or a raw material of blast furnace iron making. Besides, the sulfuric acid used as the reagent in the method can be recycled and reused, and therefore no new pollution is generated.

The invention discloses a wireless aviation burst communication system, which comprises a burst frame construction module, a receiving digital front-end processing module, a burst detector, a carrier and phase parameter extraction and recovery module, and a timing parameter extraction and recovery module, wherein the burst frame construction module is used for constructing a burst frame, and the burst frame is composed of an AGC training sequence, two identical repeated CAZAC training sequences, and a data block; the receiving digital front-end processing module is used for acquiring an initial demodulation signal with frequency offset, phase offset and timing errors; the burst detector is used for adopting the repeated CAZAC training sequences for carrying out matched filter on the initial demodulation signal, acquiring a burst sign and outputting two related peak values and related peak sidelobe values; the carrier and phase parameter extraction and recovery module is used for estimating carrier and phase parameters and completing recovery; and the timing parameter extraction and recovery module completes timing recovery. The burst frame detection probability can be effectively improved, and complexity of burst communication carrier, phase and timing recovery is reduced.

The invention provides an all-pass balanced time-reversal ultra-wideband wireless communication method used for restraining the coherent multi-path effect in the UWB wireless communication system, improving the transmission performance of the communication system and belonging to the wireless communication technical field. The shock response Hc (omega) =|Hc(omega)| *e j theta (omega) the wireless channel is measured firstly; and then the all-pass balanced factor H2 (omega) =1 / |Hc(omega)|2 and the time-reversal factor H1(omega) =|Hc(omega)| *e -j theta (omega) of the wireless channel are constructed respectively; finally, the all-pass balanced factor H2 (omega) and the time-reversal factor H1 (omega) are used for the all-pass balanced time-reversal processing towards the wireless channel, enabling the transmission function of the wireless channel after the all-pass balanced time-reversal processing to be Hc`(omega)=H2(omega)*H1(omega)* Hc(omega)=1. The invention adopts the all-pass balanced factor H2 (omega) =1 / |Hc(omega)|2 to process all-pass balancing towards the time-reversal wireless channel, enables the wireless channel processed by the all-pass balanced time-reversal processing to be equivalent to an all-pass channel and eliminates the coherent multi-path effect (frequency selective fading). The all-pass balanced time-reversal ultra-wideband wireless communication method has the advantages of simple operation, lower computation cost and being applicable to the wireless communications with different communication systems.

The invention relates to a method for extracting low-molecular-weight lignin from biomass. The preparation method comprises the following steps of (1) preparing an extraction agent: preparing cholinechloride and hydrogen bond donors into a mixed solution at a certain mol mass ratio; then, performing reaction under a certain condition to form a uniform solution, namely the extraction agent; (2) adding the extraction agent into the biomass raw materials; adding catalysts; performing reaction for a certain time under the stirring condition at a certain temperature; performing filtering; adding deionized water; performing precipitation and centrifugation to obtain solid substances; then, cleaning the solid substances by absolute ethyl alcohol and deionized water; performing drying; obtaininga finished product. According to the method, poplar, bamboo-willow, wheat straw and the like are used as the biomass raw materials; the solvent prepared at a specific proportion under the specific conditions is used as the extraction agent for extracting the low-molecular-weight lignin. The method has the advantages that the reaction conditions are mild; the process is simple; green effect and high efficiency are realized; the extraction cost is low; the method is suitable for large-scale production application.

The invention relates to a preparation technology for combined production of beta-cyclodextrin and extremely high maltose syrup. The technology comprises the following steps: carrying out starch slurry mixing to resist high temperature alpha-amylase liquefaction; adding debranching enzyme and CGT enzyme for realizing synergism; adding beta-amylase, maltogenic amylase and active carbon to synchronously carry out saccharification and decoloring; and carrying out one time crystallization, filtering, leaching the obtained solid to remove impurities in order to obtain purified beta-cyclodextrin, carrying out chromatographic separation on the obtained mother liquor, and concentrating to obtain the extremely high maltose syrup. The technology has the advantages of high starch conversion rate, one-time decoloring, one-time crystallization, simple steps, preparation of the extremely high maltose syrup, and great improvement of the integral utilization rate of a raw material.

The invention discloses a synthetic method of L-serine, which comprises the following steps: A) transforming the concentration of a substrate: adding the substrate, namely glycine and serine hydroxymethyltransferase accounting for 3%-8% by weight into a biological reactor; feeding 37% of formaldehyde water solution when the temperature is 40-50 DEG C and getting L-serine transformation liquid by transformation; B) purifying through an ultrafiltration membrane: purifying the L-serine transformation liquid in the A) step through the ultrafiltration membrane under the conditions that the temperature is 25-35 DEG C, the pressure at an inlet is 0.4-0.8MPa and the pressure at an outlet is 0.1-0.3MPa; C) performing adsorption and elution through ion-exchange resin: regulating the pH value of penetrating fluid in the B) step to 4.5-5.5, then exchanging the L-serine transformation liquid onto resin through the ion-exchange resin and further eluting with 0.8-1.5mol / L of hydrochloric acid; D) concentrating through a nanofiltration membrane: concentrating L-serine eluent in the step C) through the nanofiltration membrane under the conditions that the temperature is 25-35 DEG C, the pressure at the inlet is 0.4-0.8MPa and the pressure at the outlet is 0.1-0.3MPa; and getting an L-serine finished product after concentration. The synthetic method of the L-serine is simple in operation, short in production period, low in cost, high in yield and low in environmental protection pressure, and suitable for large-scale industrialized production.

The invention discloses a method for extracting tigogenin and / or hecogenin with a composite bacteria method. The method comprises steps as follows: pectin in agave sisal dregs is hydrolyzed with pectinase and cellulase, saponin in the sisal dregs is released while the viscosity of the sisal dregs is reduced, and then the released saponin is effectively degraded by the aid of compound enzyme produced from mould composition after fermentation. The method can be used for extracting tigogenin or hecogenin from the sisal dregs, can be used for extracting tigogenin and hecogenin from the sisal dregs simultaneously, and has the advantages of simplicity in operation, mild extraction conditions, small environmental pollution, high product yield and purity, low cost and the like.

The invention discloses an optical fiber eavesdropping positioning method and system based on machine learning and electronic equipment, and the method comprises the steps: collecting the historical signal information of an optical fiber channel, and the historical signal information comprising eavesdropping condition information and channel performance information; training by using an artificialneural network algorithm according to the historical signal information to obtain an artificial neural network model for eavesdropping positioning; collecting current signal information of the optical fiber channel, and judging whether the current signal information has an eavesdropping behavior or not; and if the eavesdropping behavior exists, taking the current signal information as the input vector of the artificial neural network model, and determining the position of the eavesdropping point according to the output vector of the artificial neural network model. According to the invention,refined processing is carried out on optical communication physical layer data by using an artificial neural network algorithm, thereby realizing intelligent positioning of optical fiber eavesdropping; and comprehensive analysis and calculation are carried out through the eye pattern of the optical fiber channel and the parameter difference, and eavesdropping positioning is carried out.

The invention discloses an energy-saving vacuum distilling system. A distilling crucible (1) and a condensing crystallizing pipe (2) of a distilling furnace system are mutually independent; the upper end of the condensing crystallizing pipe (2) is provided with an auxiliary condensing room (3); spiral resistance heating wires (4) are uniformly arranged on two sides and at the bottom of the distilling crucible (1); and the spiral resistance heating wires (4) form a three-phase triangular loop. By using the distilling furnace system, not only is the reasonable distribution of a temperature field structure achieved, but also an impurity in a distillation raw material can be effectively prevented from being interfused in a crystallized product in the condensing crystallizing pipe, and the electric current of a neutral wire circuit loop of an electric system is greatly decreased, thereby decreasing the energy consumption and the production cost of a unit product and according with the requirements on energy saving and environmental protection. The distilling system not only can be applicable to a distillation process for tellurium, but also can be used in a distillation purification process of metals such as magnesium or zinc and the like simultaneously, and has an extremely wide scope of application, and the effect that one machine has multiple functions is achieved truly.

The invention relates to the technical field of fungi, and provides a method for preparing crude ganoderma lucidum spore powder wall shell polysaccharide through irradiation. The method comprises thefollowing steps: performing irradiation treatment on ganoderma lucidum spore powder extraction waste, and irradiating by an electron beam till the dosage of 500-900kGy to obtain irradiated waste; mixing the irradiated waste and water, heating for extracting, and performing solid-liquid separation to obtain a crude polysaccharide extraction solution; drying the crude polysaccharide extraction solution to obtain the crude ganoderma lucidum spore powder wall shell polysaccharide. The raw material for extraction is the ganoderma lucidum spore powder extraction waste in which the content of ganoderma lucidum polysaccharide is lower than 1% and the content of substances which can be dissolved in water and an organic reagent is extremely low. In the crude ganoderma lucidum spore powder wall shellpolysaccharide prepared by the method provided by the invention, the content of active polysaccharide is 78% or above; compared with ganoderma lucidum spore polysaccharide extracted from ganoderma lucidum spore powder as a raw material, the crude ganoderma lucidum spore powder wall shell polysaccharide also has the advantages of an excellent immunomodulatory function and an excellent moisturizingeffect; the crude ganoderma lucidum spore powder wall shell polysaccharide can be widely applied to the field of functional food, health-care food, medicines, cosmetics and the like.

The invention provides a lane information extraction method and device and a storage medium, and aims to reduce the extraction difficulty of lane information by segmenting and clustering lane trajectory data into smooth trajectory clusters before extracting the lane information. The lane number and the lane center line position of the road track section cluster are estimated through an initial Gaussian mixture model and an expectation maximization algorithm; firstly, a least square method estimation algorithm is used for extracting a road track segment cluster for fitting, thus extracting estimated road characteristic parameters of the road track segment cluster; and the expectation maximization algorithm and the initial Gaussian mixture model are constrained through the estimated road characteristic parameters, so that the calculated amount of the estimated model parameters is reduced, the extraction efficiency and the extraction accuracy of the lane information are improved, and thetechnical problem of low extraction efficiency of the existing lane information is solved.

The invention discloses an antibacterial composition of a traditional Chinese medicine compound extract, the extract and application to an antibacterial composition. The antibacterial composition comprises the following steps: (1), mixing the following components in parts by weight: 5 to 15 parts of radix glycyrrhizae, 15 to 25 parts of scutellariae radix veta, 5 to 15 parts of radix et rhizoma rhei, 15 to 25 parts of cortex phellodendri, and 15 to 25 parts of radix sophorae flavescentis, and crushing the mixture; (2), adding distilled water for soaking, adding 1500 to 2500 U / g enzyme for hydrolysis, stirring for 1 to 2h in 35 to 50 DEG C water bath, filtering, and concentrating and drying filtrate, so as to obtain the traditional Chinese medicine compound extract; the enzyme is selected one or more of cellulase, pectinase or protease. The formed traditional Chinese medicine compound extract in the antibacterial composition can be applied to emulsifiable paste, gel and suspension, is good in antibacterial effect and mild, and does not have toxic or side effects.

A method for separating seeds and flesh of a pyracantha and a device using the method belong to a method for processing agricultural products, forest products and food, and solve the problem that the prior art is not favorable for keeping the ingredients of the pyracantha, such as pigments, juice ferment and the like, or the juice and the seeds can not be utilized. The method comprises the following steps: sorting, cleaning, separating the seeds and the peel, juicing and sieving the seeds. The seed and peel separating machine comprises a bracket, a separating screen drum, a material pushing screw and a large gear ring which are arranged in the machine cavity; a main shaft equipped with separate blades is connected with a main motor by passing through the separating screen drum to help the main motor to drive a pinion which is meshed with the large gear ring. A rotating screening machine in the invention comprises a large gear ring, a separating screen drum and a material pushing screw which are arranged in the machine cavity; a main shaft with a revolving brush penetrates the separating screen drum to be electrically connected with a main motor, and the main motor drives the pinion which is meshed with the large gear ring by a transmission shaft. The method of the invention has the advantages that the technological process is reasonable, the loss of the active components of the pyracantha is small, the overall utilization value is improved; the structure of the device is simple and practical; and the separating efficiency of the seeds is high.

The invention discloses a method for combined production of mannitol and D-lactic acid by virtue of microorganism anaerobic fermentation and belongs to the technical field of biology. The mannitol and D-lactic acid are produced by adopting Leuconostoc pseudomesenteroides G 123 with the preservation number of CCTCC NO:M 2014115 under the condition of anaerobic fermentation. The method comprises the following steps: (a) carrying out fermentation on the strain in a fermentation medium containing fructose syrup to obtain a fermentation broth containing the mannitol and D-lactic acid; and (b) separating the mannitol and D-lactic acid from the fermentation broth, and purifying. According to the method disclosed by the invention, the mannitol and D-lactic acid can be simultaneously produced with high efficiency, the total conversion rates of the mannitol and D-lactic acid to sugar reach 90 percent or more, the extraction yields both reach 83 percent or more, the purity of product is high, and the application prospect is wide.

The invention relates to the technical field of nucleic acid extraction, and particularly relates to a double-extraction-mode nucleic acid extraction workstation and a nucleic acid extraction method.The double-extraction-mode nucleic acid extraction workstation comprises a workbench, a centrifugal device, a magnetic rod device and a mechanical arm device, wherein a liquid storage tank and a plateposition are arranged on the workbench, the liquid storage tank is used for containing a reagent required for DNA extraction, and the plate position is used for containing a cracking plate, a combining plate, a cleaning plate and an eluting plate; the centrifugal device is used for separating different products in a cracked sample in the cracking plate under the centrifugal effect; the magnetic rod device is arranged on the workbench and used for adsorbing magnetic beads used in DNA extraction; and the mechanical arm device is arranged on the workbench, can add the reagent in the liquid storage tank into the cracking plate and can shift the cracking plate, the combining plate or the cleaning plate. The double-extraction-mode nucleic acid extraction workstation can reduce the nucleic acidextraction difficulty and ensure smooth nucleic acid extraction.

The invention discloses a preparation method for a mulberry leaf healthy food substrate. The method comprises the steps of a, pulverization: leaves of mulberry trees, Moraceae, Morus are taken as theraw material, the surfaces of the leaves are cleaned, and mulberry leaf powder is obtained after the leaves are dried and pulverized; b, pre-enzymolysis: water and cellulase are added to the mulberryleaves according to a certain proportion, and pre-enzymolysis is conducted; c, ultrasound-assisted enzymatic method extraction: certain volume of water and complex enzyme are added again, ultrasonic wave irradiation is exerted, and a mulberry leaf crude extract A is obtained; d, refining: the mulberry leaf crude extract A passes through an ultrafiltration membrane with the molecular weight of 10000 Da, and permeating liquid is collected; the permeating liquid passes through an ultrafiltration membrane with the molecular weight of 500 Da to collect intercepted fluid, and the substrate is obtained after vacuum concentration and atomizing drying are conducted on the intercepted fluid. The primary components of the prepared food substrate are flavone and n-saccharide compounds, enzymatic pre-treatment and ultrasound-assisted enzymatic method extraction technologies are adopted to greatly improve the extraction rates of mulberry leaf flavone and alkaloid, and the method has the advantages of being simple and convenient in technology, green efficient and significant in effect.

According to the technical scheme adopted by the invention, the IGBT physical model parameter extraction method is characterized by comprising the following steps: acquiring an initial value and a transformation range of an IGBT physical model parameter; and correcting the model parameters through the corresponding relationship between the IGBT dynamic and static characteristics and the IGBT modelparameters and in combination with the IGBT model parameter experiment measurement result. Aiming at the defects in the prior art, the invention provides the IGBT physical model parameter extractionmethod, so that the requirement of parameter extraction on the model simulation precision is ensured, the IGBT physical model parameter extraction method can be greatly simplified, and the practicability of the IGBT physical model is improved.

The invention relates to the technical field of mechanical rotating equipment fault diagnosis. The invention specifically discloses a rolling bearing fault diagnosis method under variable working conditions based on a vibration diagram and transfer learning. The method comprises the following steps: 1, collecting a fault data sample set A of a rolling bearing under known working conditions; 2, carrying out EMD decomposition noise reduction and time-frequency conversion on A; 3, converting a one-dimensional time domain signal and a frequency domain signal obtained by time-frequency conversion into a two-bit vibration diagram; 4, extracting fault features in the vibration diagram to form a fault feature set T1 and repeating the above steps for to-be-tested data to form T2; 5, adopting transfer learning to learn T1 and T2 to obtain a new feature set T3, and carrying out classification training on T3 to obtain a classification model; and 6, adopting the classification model to carry out fault diagnosis on a sample B to be tested. According to the invention, automatic extraction of fault sensitive features is realized, effective diagnosis of rolling bearing faults under different working conditions is realized, and the method has high diagnosis accuracy.

The invention relates to a preparation technology of beta-cyclodextrin. The technology comprises the following steps: carrying out starch slurry mixing to resist high temperature alpha-amylase liquefaction; adding debranching enzyme and CGT enzyme for realizing synergism; adding glucoamylase and active carbon to synchronously carry out saccharification and decoloring; and filtering, carrying out one time crystallization, and leaching to remove impurities in order to obtain purified beta-cyclodextrin. The technology has the advantages of starch conversion rate increase, one time decoloring, one time crystallization, and production efficiency improvement.

The invention discloses a method for recycling phosphorus from sludge ash. According to the method, sludge incineration ash is taken as a raw material and undergoes first extraction with a sulfuric acid solution, then the obtained extraction liquid is mixed with a concentrated sulfuric acid solution according to a volume ratio of 28.8:1.2 to 28.4:1.6, so that a new extracting agent is prepared andused to extract the remaining sludge ash; and if necessary, the sludge ash can be divided into multiple parts for multiple extraction, and an extracting agent used in a next extraction is formed by mixing an extraction liquid obtained after a previous extraction with a concentrated sulfuric acid solution. In the method of the present invention, the extraction liquid is used as an extracting agent, so that discharge of waste liquid is greatly reduced, and after cyclic extraction, the extraction rate of phosphorus in the sludge ash can exceed 96%, and the concentration of phosphorus in a finalextraction liquid exceeds 21-23 g / L, thereby effectively solving the technical problems of low phosphorus extraction rate, large consumption of chemicals and large amount of waste liquid in the priorart.

The invention discloses a medical femoral head taking device. The medical femoral head taking device comprises a sleeve and a head taking device. The sleeve is hollow, and sharp teeth are arranged at one end of the sleeve. A handle is arranged at one end of the head taking device, a connecting rod is connected to the handle, and a self-tapping threaded head is arranged at one end of the connecting rod. The head taking device can penetrate through the hollow structure of the sleeve. The medical femoral head taking device is simple in structure, convenient to operate, and capable of effectively reducing the femoral head taking difficulty, operation time is shortened, and it is guaranteed that operations are smoothly performed.

The invention discloses a whole sugarcane seed-cutting device and method based on visual identity, belonging to the field of agricultural planting machines. The whole sugarcane seed-cutting device comprises a sugarcane rod transverse conveying mechanism, visual processing equipment, a position calibration mechanism and a seed-cutting tank, wherein the visual processing equipment, the position calibration mechanism and the seed-cutting tank are located above the sugarcane rod transverse conveying mechanism, and the seed-cutting tank is arranged on one side of the sugarcane rod transverse conveying mechanism. A whole sugarcane rod is identified based on a visual identity technique, the position of each stem node is analyzed, and the rotation number of times of a motor is calculated in advance, so that the precise cutting of the whole rod is realized, and each cut stem rod is provided with a stem node. Aiming at the deficiencies in the prior art, the invention discloses the whole sugarcane seed-cutting device with a relatively simple structure and the functions of static identification, dynamic regulation and position calibration; and by virtue of the seed-cutting method based on thedevice, the seed-cutting precision is increased, and the yield of sugarcane seeds is guaranteed.

The invention belongs to the fields of the treatment and recycling of solid wastes and particularly relates to an extraction method of a protein in sludge and application of the protein. The method comprises the following steps: carrying out combined treatment on sludge by virtue of ultrasonic waves and papain, so as to obtain a crude protein extracting solution; and purifying and concentrating the crude protein extracting solution through the coupling of an ammonium sulfate precipitation method and a dialysis bag adsorption method, so as to obtain a fine protein extracting solution. The extraction method has the beneficial effects that the whole operation flow is simple, the feasibility is high, other substances are not introduced, the further treatment and recycling of the sludge are notinfluenced, and the obtained protein fine extracting solution can be taken as a raw material for producing leaf fertilizers.

The invention discloses a flexible direct-current power grid short-circuit fault property judging method and a reclosing method. The judging method comprises the following steps that: when a short-circuit fault occurs on a direct-current power transmission line in a flexible direct-current power grid, and two direct-current circuit breakers of the line are switched off, the input-side active converter of the line is controlled to generate alternating-current signals, and the alternating-current signals are injected into the line through the commutation branch of the input-end direct-current circuit breaker; and the fault characteristic quantity of the line is detected, the detected fault characteristic quantity is compared with a preset value on the basis that different fault properties are corresponding to different fault characteristic quantities, and therefore, the property of the fault can be judged. According to the flexible direct-current power grid short-circuit fault property judging method and the reclosing method of the invention, after the direct-current short-circuit fault occurs and the direct-current circuit breakers are switched off, the active converter is controlled to generate the alternating-current signals used for identifying the property of the direct-current short-circuit fault; the alternating-current signals are injected into the fault line through thecommutation branch of the direct-current circuit breaker; the property of the fault can be judged on the basis that different responses are generated according to different faults; and therefore, thedirect-current circuit breaker is prevented from reclosing under a permanent fault, and the recovery speed of a power grid of which the instantaneous fault has been removed is accelerated.

The invention discloses a saffron crocus fermentation product preparation method, which comprises: 1) bacterial column activation and expanding culture: inoculating a liquid seed culture medium with Saccharomyces cerevisiae and Monascus purpureus, and culturing to obtain a seed liquid; 2) fermentation culture: inoculating the seed liquid obtained in the step 1) into a fermentation culture medium of a fermentation tank, and fermenting to obtain fermentation liquid; wherein the fermentation culture medium comprises saffron crocus and a liquid culture medium; the saffron crocus accounts for 1-5% of the mass fraction of the fermentation culture medium; (3) inactivating the fermentation product: inactivating the fermentation liquid prepared in the step (2); and 4) purification: performing purification treatment on the inactivated fermentation liquor for multiple times to obtain the saffron crocus fermentation product. The invention also discloses an application of the saffron crocus fermentation product. The saffron crocus leavening provided by the invention has the advantages of high content of active ingredients and strong antioxidant and anti-saccharification activity, and is suitable for popularization and application.

The invention relates to a method for fetching broken bolts from bolt holes. The method includes steps of selecting a steel tube; pressing plastic clay into a bolt hole with the corresponding broken bolt, compacting the plastic clay and then fetching the plastic clay; grinding the outer wall of one end of the steel tube to so that the shape of the ground outer wall of the end of the steel tube is identical or similar to that of the cross section of the broken bolt according to a shape which is printed on the plastic clay and corresponds to the cross section of the broken bolt, and grinding an oblique surface with an oblique angle ranging from 60 degrees to 80 degrees on a circle of the inner wall of the steel tube; placing the machined steel tube into the bolt hole, firmly welding the steel tube with an end surface of the bolt and finally fetching the broken bolt by the aid of a tool with high clamping force. The outer diameter of the steel tube is smaller than the inner diameter D1 of threads of the broken bolt, the wall thickness of the steel tube is 15-25% of the inner diameter D1 of the threads of the broken bolt, and the outer diameter D2 of the steel tube meets the condition that D2 / D1X100% is within the range from 70% to 90%. The method has the advantages that the broken bolt can be fetched without perforation, and accordingly the damage probability of the threads of a body of the broken bolt due to perforation can be effectively reduced; the broken bolt fetching difficulty can be reduced, the broken bolt fetching time can be effectively shortened, and safe and stable running of corresponding equipment can be timely restored.

The invention discloses a cell and a production method thereof and relates to the technical field of cells. The main technical scheme includes that the cell comprises a roll core group, a connecting structure and tabs, wherein the roll core group comprises a plurality of roll cores, each consisting of a positive electrode lug and a negative electrode lug; the connecting structure comprises a positive electrode connecting structure and a negative electrode connecting structure, the positive electrode connecting structure is connected with all the positive electrode lugs in the roll core group,and the negative electrode connecting structure is connected with all the negative electrode lugs; the tabs include a positive electrode tab and a negative electrode tab, wherein the positive electrode tab is connected with the positive electrode connecting structure, and the negative electrode tab is connected with the negative electrode connecting structure. The cell mainly refers to a multi-roll-core pouch cell high in rate capability, and the corresponding production method is simple.

The invention discloses a knowledge graph construction method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring a target text to be subjected to named entity recognition; on the basis of preset attribute information of a plurality of preset entities, labeling each word in the target text to obtain a labeling data set including labeling data of each word; obtaining a named entity recognition result of the target text according to the annotation data set; according to the named entity recognition result, preprocessing all entities corresponding to different attribute information; according to a preset rule, classifying the entities according to different levels; and constructing a knowledge graph corresponding to the target text by using the entities of different levels, and storing the knowledge graph. According to the embodiment of the invention, the workload of workers and the information extraction difficulty are reduced, so that the information extraction efficiency and accuracy can be improved, and the labor cost and the time cost are reduced.