1094results about How to "Operable" patented technology

The present invention features an ultrasonic surgical system including an ultrasonically vibrating blade, and retractable grasper. The grasper includes a grasping jaw or clamp that is movable, in a direction perpendicular to the primary vibratory mode of the ultrasonic blade element, from an open, extended position to a closed position in which tissue is grasped between the jaw and the vibrating blade, and to a retracted position for storage. The jaw is preferably hinge-actuated.

The invention provides a control algorithm of multi-unmanned aerial vehicle cooperation formation and obstacle avoidance. The control algorithm comprises steps of (1) when an unmanned aerial vehicle formation executes a flight task, detecting positions and speed information of the unmanned aerial vehicles and airspace obstacles through an airborne sensor, and abstracting obstacles in a flight space into ball bodies; (2) according to position information of each unmanned aerial vehicle, constructing an unmanned aerial vehicle formation communication topology, and using a distributed transmission method, achieving information interaction between neighborhood unmanned aerial vehicles in the formation; (3) constructing an unmanned aerial vehicle dynamics model; and (4) when detecting an obstacle, determining a safe distance of obstacle avoidance of the unmanned aerial vehicles, judging whether the distance between any unmanned aerial vehicle and the obstacle in the unmanned aerial vehicleformation meets requirements of the safe distance, and if not, adjusting the formation pattern and carrying out obstacle avoidance through a virtual force strategy. The control algorithm is operable and simple; cooperation formation of multiple unmanned aerial vehicles can be achieved; obstacles can be avoided quite flexibly; and the control algorithm is very important for multi-cooperative combats.

The invention discloses a plant polysaccharide cigarette filter tip and a preparation method thereof. Plant polysaccharide, starch, adsorbent, plasticizer, emulsifier, waterproofing agent and plant protein are blended according to a certain proportion, so that the filter tip is prepared. The preparation method includes the following steps: (a) the starch, water and the plasticizer are blended and stirred, so that modified starch solution is obtained; (b) the plant polysaccharide and the modified starch solution are blended; (c) under certain conditions, the emulsifier, the waterproofing agent and the adsorbent are added into the mixture of the plant polysaccharide and the modified starch solution, and after stirring, the mixture is injected into a long cylindrical mold made of anti-freezing, heat-proofing material and molded; (d) the semifinished product is placed into a freezing environment and frozen, i.e. prefreezing; (e) the semifinished product in step d is placed into a freeze dryer and freeze-dried; (f) the porous composite body is taken out of the mold and deburred, and thereby a filter tip stick is obtained. Material resources are rich, the cost is low, and the three wastes cannot be produced. The performance is good, the filter tip can reduce the nicotine content by 40.2 to 84.1 percent, the tar by 26 to 72.1 percent and the nicotinamide by 20 to 39.2 percent, and after use, waste can be biodegraded.

The invention discloses application of CRISPR / nCas9 mediated site-directed base substitution in a plant. The invention provides a plant genome site-directed edition system. The system comprises a BE3 plant expression carrier (expressing a fusion protein composed of nCas9(D10A), deaminase and a uracil DNA glycosylase inhibitory protein), and rice OsPDS and OsSBEIIb are taken as target genes for verifying the system. Results show that an expected site-directed mutant plant is respectively obtained in the three selected target spots, accurate site mutation of a base is realized in rice, and the highest efficiency reaches about 20%, so that a feasible and effective base substitution method is provided for crop breeding, the method has strong application potential in the aspect of agricultural breeding, and a foundation is provided for rapidly improving important agronomic traits of crops.

The invention relates to a preparation method of a high-performance carbon nanotube fiber, which comprises the following specific steps of: drawing a carbon nanotube film from a spinning carbon nanotube array; then, immersing the carbon nanotube film in a thermosetting polyamic acid / N-methyl pyrrolidone solution, and twisting to form a carbon nanotube / polyamic acid composite fiber; subsequently, curing the carbon nanotube / polyamic acid composite fiber so that polyamic acid in the composite fiber forms polyimide with a net type crosslinking structure; and finally preparing the carbon nanotube / polyimide composite fiber. The invention has the advantages of simple and easy process, low cost and easy realization of large-scale production; moreover, the prepared carbon nanotube composite fiber has excellent mechanical performance, the strength can reach 2.06 GPa, the tenacity is superior to that of carbon fiber, and the conducting property is maintained unchanged as compared with that of pure carbon nanotube fiber; meanwhile, the carbon nanotube composite fiber also has the operability of common yarn, so that the requirements on subsequent treatment processes of stretching, stranding, weaving and the like can be satisfied.

The invention discloses a method and device for estimating a power battery charge state on line. The method comprises the steps that a capacity correction factor of a power battery is calculated according to the accumulated released energy of the power battery, the internal resistance of the power battery is calculated, a state space model of the power battery is established, and the state space model of the power battery is substituted into an unscented Kalman filter to obtain the estimated value of the battery charge state. According to the method and device for estimating the power battery charge state on line, the capacity correction factor of the power battery is calculated according to the accumulated released energy of the power battery, the accumulated released energy of the power battery is the sum of energy consumed by load acting and energy consumed by the internal resistance from the first time up to now, the accumulated released energy of the power battery can reflect the using history of the battery like the cycle index and is more beneficial to accurate measuring in numerical value, and therefore the method of correcting the related parameters of the battery through the accumulated released energy of the power battery is better in operability and is more accurate in estimated value.

There is provided an abnormality determination unit that determines whether or not an output measurement unit is abnormal, in order to determine abnormality of the output measurement unit. When the output measurement unit is abnormal, the operation of an elastic actuator is controlled not in accordance with a measurement result of the output measurement unit but in accordance with an internal state model.

The invention relates to an anisotropism evaluation method for oil and gas generation quantity of shale. The method includes the following steps that firstly, different depth points on a section of the shale are densely sampled, basic parameter values are obtained through Rock-Eval pyrolysis detection, and organic matter types are determined; secondly, a conceptual model is established, and contents of organic carbon of different types are calculated; thirdly, a simulated experiment is designed, and a heavy hydrocarbon oil yield and natural gas yield evolvement model is established; fourthly, the total quantity of hydrocarbon generated and discharged by the different depth points of the shale and the quantity of heavy oil, light oil and gas generated and discharged by the different depth points of the shale are calculated, and the anisotropism of the oil bearing possibility and gas bearing possibility of the shale is evaluated. The models are established on the basis of a large number of sample data points of the section, anisotropism evaluation can be carried out on oil and gas resources of the shale, under the situation that samples are limited, the method is still suitable in combination with logging information, and therefore the method has a great significance in quantitatively representing the anisotropism of the oil bearing possibility and gas bearing possibility of the shale and accurately evaluating unconventional shale oil and gas resources.

The invention discloses a method for producing potato flake with high dietary fiber content. The method comprises the following steps: after the byproduct of wet potato residue generated through flour-residue separation during potato starch production is subject to acid base interaction, oxidation or enzymolysis and micronization, the micronized dietary fiber of potato is mixed with mashed potatoes obtained through steaming, boiling and smashing in a certain content ratio, the mixture is dried through a roller dryer, the moisture content in the product is smaller than or equal to 10 percent, and the potato flake rich in dietary fiber is produced after crushing and sieving. The method of the invention is suitable for being implemented in whole potato processing production enterprises, the produced potato flake is rich in an excess amount of dietary fiber and can be used as an auxiliary material for processing other foods, therefore, the economic value of the byproduct of starch production, i.e., wet potato residue is greatly increased, and pollution to the environment is reduced.

The invention discloses a method for sharing desktop contents and intelligent equipment. The method comprises the following steps: transmitting video data by consulting with a video terminal to acquire video parameters required for the transmission of the video data, and establishing a video session channel with the video terminal; acquiring the display data of the desktop contents to be shared; converting the display data to a video stream according to the video parameters; and pushing the video stream to the video terminal by utilizing the video session channel. The intelligent equipment comprises a consulting module, an acquiring module, a converting module and a pushing module. The method and the intelligent equipment can improve the sharing flexibility, convenience and operability of the desktop contents.

The invention discloses a comprehensive assessment method for the operation effect of a power grid side energy storage power station, and the method comprises the steps: constructing an energy storagepower station operation effect assessment index system, and determining a to-be-assessed scheme set; According to the actual operation data of each power station, calculating and extracting evaluation indexes of all schemes in the scheme set to be evaluated of each power station to form an initial decision matrix, and performing standardized processing to obtain a normalized decision matrix; Adopting an analytic hierarchy process to obtain a subjective weight vector of the evaluation index, adopting an entropy weight method to determine an objective weight vector of the evaluation index, andobtaining a comprehensive weight vector of the evaluation index through a game theory combination weighting method; And comprehensively evaluating the operation effect of each power station. The constructed index system has scientificity, applicability and operability, the selected indexes are high in applicability, and calculation is easy; The actual operation effect of the power grid side energystorage power station is comprehensively evaluated from many aspects, and a basis is provided for planning construction, scheduling operation control and the like of a subsequent energy storage project.

The invention provides a roof greening light host material made from industrial and agricultural wastes and is characterized in that the industrial and agricultural wastes serve as the major ingredients to prepare a light roof greening planting substrate; the substrate is a compound with the following main materials: flyash, coal cinder, straw grains, garden wastes and yellow soil; the proportions of the materials are as follows: 11-20% of flyash, 10-22% of coal cinder, 20-25% of straw grain, 20-32% of garden waste and 18-20% of yellow soil. In the invention, the common industrial and agricultural wastes are applied to the light roof greening planting substrate, which facilitates reduction of the cost of roof greening materials, improves comprehensive utilization level of natural resources and promotes cyclic utilization of the industrial and agricultural wastes and protection of the natural environment. The material of the invention has the advantages of few component types, easily available materials, low cost, environmental protection and high efficiency and suitability for large-scale promotion throughout the country.

The invention relates to the field of spacecrafts and aims to provide an unstressed installation method, which solves the problems of unstressed butt joint between a solar cell array and a driving mechanism and the like. The method is characterized in that: the flatness of an installation surface and the horizontality or the perpendicularity of a reference axis are ensured by a solar cell array driving mechanism installation plate [1]; the spatial position of a solar cell array driving mechanism product [2] on a corresponding installation plate is ensured through a solar cell array driving mechanism simulation tool [3] of which the appearance is similar to that of the product and the accuracy is improved, and the reset accuracy of the product is ensured through a positioning block [4]; a solar cell array installation frame [5] is adjusted or machined on the basis of the spatial position of the high-accuracy solar cell array driving mechanism simulation tool [3] which is determined in a spacecraft; and a solar cell array [6] in an unfolding state is in unstressed butt connection with the solar cell array driving mechanism [2] by measures such as integral translation, rotation and the like. The invention has the advantages that: the method is reasonable, simple and convenient, is practicably operated, makes installation reliable, has high adaptability, and the like.

The invention provides a method for generating an electronic map. The method includes a data collecting procedure, a data storage procedure and an electronic map displaying procedure, wherein the data collecting procedure includes a step of collecting vector data and additional data corresponding to the vector data; the data storage procedure includes the steps of storing the collected vector data and the collected additional data in a server database, enabling the vector data corresponding to different types of main body elements to be stored in a plurality of layers, and enabling the vector data of each type of main body elements to be stored in one layer; the electronic map displaying procedure includes the steps that an electronic map displaying end obtains the vector data and the additional data from a server, draws vector diagrams corresponding to each layer of vector data layer by layer according to the vector data in each layer, and adds the additional data related to main body element identification data (ID) in the layer of vector data, and consequently the electronic map is generated in a displaying device.

The invention discloses a rockfall prevention driven flexible protective net system designing method based on the energy matching principle. The rockfall prevention driven flexible protective net system designing method comprises the steps that 1, the energy consumption rate matching principle of components of a driven flexible protective net structure is established; 2, preliminary model selection and arrangement are performed on the components of the driven flexible protective net structure; 3, an explicit dynamics computation model capable of considering features such as the initial perpendicularity, large sliding of a supporting rope, large rotation of a supporting column and large deformation of an interception net is built through a finite element computing method; 4, impact loading is performed on the computation model, and dynamics response of the structure under the impact effect is analyzed; 5, structural design of the driven flexible protective net is performed. According to the method, the design principle of energy matching is adopted, both the force balance and the energy balance are considered, and the design is more scientific and reasonable; the component strength, stability, deformation and the like are used as design verification control indexes, and both the component design bearing capacity safety storage and the applicability of the protective net structural overall interception effect are considered.

The invention discloses a pile bottom cave sonar detection device and method. The signal output end of a three-dimensional electronic compass it connected with the compass signal input end of a single-chip microcomputer. The signal input end of a sonar stress wave driving module is connected with the signal output end of the single-chip microcomputer. The stress wave driving signal output end of the sonar stress wave driving module is connected with a sonar stress wave transmitter. A sonar stress wave receiving sensor is connected with the sonar signal input end of the single-chip microcomputer through a sonar stress wave signal processing module. The communication end of the single-chip microcomputer is connected with an on-site host through a communication cable. A sonar detection probe is perpendicular to the bottom of a pile. The pile bottom cave sonar detection device and method, which are provided by the invention, can carry out detailed karst cave or weak rock detection on an area below the pile bottom, and can accurately determine whether a karst cave or weak rock is in a pile bottom detection range, wherein the karst cave or the weak rock influences the bearing capacity of the pile bottom.

The invention discloses a preparing method of injectable sodium hyaluronate gel containing microballoons. The preparing method comprises the following steps of dissolving sodium hyaluronate into purewater to obtain a solution A; adding a microballoon material into the solution A, and conducting uniform stirring to obtain a homodisperse suspension liquid B; adjusting the PH value of the suspensionliquid B to obtain a suspension liquid C; adding a crosslinking agent into the suspension liquid C, conducting uniform stirring to obtain a homodisperse suspension liquid D, after a reaction is carried out for a certain period of time, crosslinking sodium hyaluronate in the suspension liquid D to form colloid E containing the homodisperse microballoon material; smashing the colloid E to obtain gel particles F, and obtaining gel particles G through screens with different mesh numbers; removing soluble impurities and crosslinking agents in the gel particles G in a repeated soaking or dialytic mode to obtain gel particles H; utilizing a PBS buffering solution for balancing for repeatedly soaking the gel particles H to obtain gel particles I; obtaining the sodium hyaluronate gel through the procedures of semi-dehydration, filling and sterilization. By means of the preparing method, the problem that the microballoon material is deposited and gets caked is effectively solved.

A time-attitude based method for decomposition and synthesis of imaging satellite observation task is disclosed. The method is characterized by comprising the following steps: (1) determining the time-orientation vector of a target according to the weft height of the target and the position of a satellite; (2) establishing an external characteristic rectangle, with a long edge parallel to a star line and including all target points, as a target region, determining a pitch angle, and calculating the characteristic vector of a region target; (3) according to the width of the satellite, dividing bands; and (4) according to the region target borders, cutting the bands to a right length. The method can intuitively and efficiently conduct target decomposition and synthesis, and more easily generate element task information input to a task planning and scheduling model. The method puts forward a concept of time-attitude, which is not only easy to understand and calculate, but also provides a unified description method for target decomposition and synthesis, and has certain operability, generality and scalability.

The present invention provides a code rate control method facial to video having multiple viewports, the aim of the effect code rate control inder the frame rate condition in the multiple viewport video code based on the previous determined code rate is achieved by improving the secondary rate-distortion model of the traditional video code, and adopting code rate control mode and picture constitution having two models and frame layer secondary code rate control method. Contrast to the traditional second rate distortion model, the improved rate distortion model of the invention has higher accuracy, effectively processing code rate forecast, the given video code rate control method is simply, having smaller calculated amount, maneuverability for processing effect code control in the multiple viewports video code. The code rate control method facial to video having multiple viewports of the invention is used for video communication field such as three-dimensional television, vectorgraph, machine vision, telemedicine.

The invention discloses an adaptive lane-change early-warning method based on driver characteristics. The adaptive lane-change early-warning method is used for the technical field of intelligent driving assisting / vehicle active safety, traffic accidents caused by lane-change operation can be reduced, and the operation load of a driver is relieved. According to the adaptive lane-change early-warning method, through a fuzzy logic method, the influence degree of surrounding vehicles on vehicle lane-exchange is determined with the speed association degree, the lane-exchange safety coefficient andlateral offset as indexes, and lane-change parameters are corrected; model parameters are identified on line through recursive maximum likelihood estimation, and a real-time danger estimation value isobtained; and an optimal alarm threshold value is searched based on information entropy, the real-time estimation value is compared with the alarming threshold value, an alarm state of a system is judged, and a driver is assisted in conducting safe lane-change operation. Algorithm parameters can be identified on line, the calculation amount is small, the threshold value is adjustable dynamically,psychological expectation of a driver is met, and operability is achieved.

A multifactor quantitative evaluation method for the 3D porosity in a geological period belongs to the technical field of diagenetic value simulation in a low-penetration compact reservoir. A planer grid well is selected, and well logging, logging, seismic and analysis and test data is collected and arranged; a 3D burial history and a thermal history under constraints of a sequence stratigraphic framework and deposition microfacies are established, 3D porosity evolution history models of mudstones, arkoses, quartz sandstones and rock-fragment sandstones are established on the basis of a target position, and porosity evolution histories of the different rock types in the target position are evaluated; on the basis of contribution of cementation and corrosion effects of the target position in a research region to the total porosity, porosity effect is corrected by decrease and increase, and a 3D porosity evolution process is evaluated; and a practically measured porosity of the grid well and the simulated porosity of a corresponding well point are analyzed by comparison, the precision requirement is met when the matching degree reaches 75%, and space-time distribution of the 3D porosity of the low-penetration compact reservoir in the geological period is evaluated.

The invention discloses a preprocessing and segmentation threshold value determining method of volcanic CT images. The method comprises the following steps that volcanic CT sampling is conducted; the volcanic 2D CT images are collected; 2D CT image data are preprocessed; the images are superimposed to form a three-dimensional data body; a three-dimensional reconstruction body binaryzation threshold value method is improved and determined; a three-dimensional reconstruction model of the volcanic CT images is built, and three-dimensional display is conducted. The method resolves the problem of the dimensional restriction of analysis of a volcanic storage space in the prior art, expands the application range of the CT technique, enables a large number of oil field researchers to quantitatively conduct three-dimensional reconstruction of the volcanic CT images more conveniently, and has scientificity and universality.

The invention discloses an implement method and display system for car sharing based on a cab. In the invention, a vehicle-mounted LED display screen which is installed outside the cab to display car sharing information is arranged at a striking place of the cab, and the current car sharing information which is input by a driver is received by a vehicle-mounted keyboard; and the car sharing information, such as traveling destinations, number of the rest passenger seats on the cab and the like, is input into the vehicle-mounted LED display screen for display. In such a way, the passengers waiting for the cab can conveniently know the information of the transient cabs so as to select and take the appropriate cabs. The implement method and the display system have operability, which can relieve traffic pressure and be convenient for trip of passenger in the traffic peak period, thereby improving the use efficiency and use ratio of the cabs, providing effective user picking and taking routine ways for traffic balance and achieving effective car-sharing service.

The invention provides a control method for film tension in film productions, which comprises a film manufacturing system established in the film productions. The film manufacturing system includes at least a roll back, a material belt, a roll up and tension controller and servo-driven device. Then, a swimming roll mechanism is equipped in front of the roll-up. The swimming roll mechanism comprises a swimming roll, a swing link and a cylinder which are in continuous action with the floating roll mechanism, and a swimming roll potentiometer. After that, the tension of the material belt is kept balance with the force of the cylinder and the swimming roll is located at the center according to preset cylinder pressure. Because the swimming roll mechanism is added in the film production system, the control method for film tension in film production of the invention realizes indirect tension detection via position change of the swimming roll in the swing roll mechanism, and keeps tension realizing presetting by adjusting the position of the swimming roll timely according to detection results. The method of the invention has the advantages of simple structure and immediate reaction, which has operability, high stability and durability.

The invention relates to energy processing of organic waste water, in particular to a microbe fuel cell inoculation and acclimation starting method for energizing organic waste water, aiming at recovering chemical energy in the organic pollutant in the form of electric energy. Firstly, mixed strains are inoculated in an anode chamber, and the culture condition is adjusted; after the voltage outputpeak value is stable in each operational period, waste water to be processed is added into the anode chamber after inoculation; a small amount of waste water to be processed is added during the firstoperational period on the premise of avoiding influencing the voltage output stability; the proportion of waste water to be processed is gradually increased during the subsequent period until the waste water to be processed is used completely to finish the microbe fuel cell acclimation. The invention has strong operability, step-by-step acclimation process and stable effect.

The invention relates to a quick-frozen fried shrimp cake food and a manufacturing method thereof, which is characterized in that 60-80 percent of shrimp congee made from fresh shelled shrimps that are treated at low temperature is used as raw material. Then, 5-10 percent of fish congee, 1-5 percent of soybean protein, 5-10 percent of corn starch, 0.1-0.5 percent of quality improver, 0.2-0.3 percent of water maintaining agent, 2-8 percent of condiment and 5-10 percent of water are added to be kneaded at low temperature uniformly to obtain cake core material. The external surface of a cake core which is molded by the cake core material is covered with a layer of bread flour to form a shrimp cake. After being gelatinized, the shrimp cake is fried until the external surface is golden yellow. After cooled, the fried shrimp cake is quickly frozen to obtain the quick-frozen fried shrimp cake food. The food comprises 70-90 percent of the cake core and 10-30 percent of the bread flour by weight percentage. The food is provided with golden yellow outer surface, crisp outside and tender inside. The freshness of brine shrimp is maintained, and the nutrition components of other raw materials are synthesized. The cake core of the food has the advantages of good elasticity, perfect taste and convenience. The manufacturing method of the shrimp cake food has the advantages of reasonable process, feasible operation and high manufacturing efficiency and suitability for industrialized production.

The invention discloses a dye sensitized solar cell, which comprises an optical anode, a counter electrode, electrolyte and a packaging shell. The counter electrode is positioned above the optical anode and is arranged inside the packaging shell; the electrolyte is full of the packaging shell; the optical anode comprises a transparent conductive substrate, a transparent conductive film and a porous transition metal oxide film which adsorbs dye molecules; the porous transition metal oxide film is coated on the transparent conductive film; and the counter electrode comprises a diaphragm serving as a substrate of the counter electrode, and a catalytic material and a grid electrode which are deposited on the diaphragm in turn. The invention also discloses a method for preparing the dye sensitized solar cell. The invention reduces the manufacturing cost, lightens the cell weight, reduces the short circuit risk and shortens the electronic transmission distance, and the dye sensitized solar cell is high-efficiency.

The invention relates to a cascade-reservoir self-adaptive integrated dispatching system and a cascade-reservoir self-adaptive integrated dispatching method integrating multi-source information, wherein the dispatching system comprises an external-source information-accessing module, an internal-source information-collecting module, a distributed-type information-transmitting module, a multi-source information integrating module, a dispatching-effect checking module, a self-adaptive optimizing module and a remote control center. According to the dispatching system and the dispatching method, the monitoring and transmitting functions of the multi-source information are provided by using a reservoir upstream sub drainage basin and a downstream river-channel controlled cross section as base units, and the dynamic analyzing and checking functions of cascade-reservoir integrated dispatching effects are realized on the basis of integrating the multi-source information; the nonlinear responding relationship among the dispatched draining flow quantity of a cascade reservoir and the flow quantity, the water level as well as the water quality of the downstream river-channel controlled cross section is functionalized, and the self-adaptive optimizing and feedback improving functions of the integrated dispatching of the cascade reservoir are provided. The dispatching system and the dispatching method are characterized in that the comprehensive benefits of flood prevention, electricity generation, shipping, ecology and water environments of the cascade reservoir are markedly enhanced.

The invention provides a band steel stretch-bending straightening system with capable of controlling the elongation rate and a control method thereof, wherein the band steel stretch-bending straightening system comprises an unreeling inlet roller, a stretch-bending straightener, a reeling outlet roller, a first motor and a second motor, wherein the first motor and the second motor respectively drive the inlet roller and the outlet roller. The band steel stretch-bending straightening system is characterized by also comprising a band steel inlet, an outlet speed measuring device, a first speed regulator, a second speed regulator and an elongation rate computing control device. The band steel stretch-bending straightening system capable of controlling the elongation rate and the automatic control method of the elongation rate of the band steel can realize the closed-loop control to the elongation rate of the band steel in the stretch-bending, straightening and producing processes of the band steel, have the advantages of high automation degree, simple, convenient and rapid operation, high stability and high precision and greatly improve the leveling production of the band steel and the quality of a processing product of the band steel.

The invention provides a layered refracturing method. The method includes the following steps that the reservoir characteristic parameter and the initial crack characteristic parameter are obtained; and a layered refracturing mode, the fracturing fluid and layered refracturing construction parameter are selected; if necessary, initial cracks are repaired; refracturing is conducted to obtain new cracks; balancing and replacement are conducted. According to the method, a suitable layered refracturing mode is selected, the initial cracks and a propping agent are made full use of, the process parameters of refracturing are optimized so as to achieve optimum matching with a reservoir and form the new cracks, on this basis, the fracturing extent of each layer is improved, the height and extending of the new cracks are controlled, the crack propping profile is rationally optimized and controlled, the complexity degree of the new cracks is improved, and the volume is effectively transformed.