1442results about How to "Lower requirement" patented technology

The invention relates to the technical field of display screen color adjustment, and discloses a display screen color adjustment method and system based on environment information, and the method comprises the steps: obtaining display content data, environment color data, environment light data and a display screen type of a display screen; calculating color perception data according to the environment color data and the display screen type, and performing data processing on the color perception data to obtain chromaticity feedback data; establishing a relationship between the ambient light data and user preferences through a support vector machine method to obtain user evaluation data; inputting the chromaticity feedback data and the user evaluation data into a color correction model to obtain color adjustment data; classifying the display content data and calculating a type weight index through a squirrel optimization algorithm to obtain a weight index; and generating a color adjustment instruction according to the color adjustment data and the weight index, and performing adaptive adjustment on the display content. The method solves the problems that the color adjustment of the display screen has high requirements on a light source environment and is strong in subjectivity.

The invention provides a railway knowledge question answering method and device based on a natural language model, and relates to the technical field of natural language processing, and the method comprises the steps: obtaining a railway business question; inputting the railway business question into a pre-trained railway natural language large model to obtain an answer corresponding to the railway business question; wherein the railway natural language large model is obtained by pre-training a natural language large model based on a railway natural language sample library and performing supervised fine tuning on the pre-trained natural language large model; the natural language sample library is formed by labeling data in a railway natural language knowledge base; the railway natural language knowledge base is formed by classifying and storing railway business data. Through the method provided by the invention, the railway natural language large model with professional knowledge question-answering ability is trained and generated, and the efficiency and accuracy of railway knowledge question-answering are improved; and related problems of text application scenes in the railway field are solved.

The invention discloses a ring piece ultrasonic detection noise reduction and identification method and system and a computer storage medium. The method comprises the steps that a matched ultrasonic phased array probe is selected according to the shape and size of the cross section of a workpiece, and technological parameters are set and comprise at least one of the probe frequency, the number of array elements, the water layer height and the focusing depth; according to the selected ultrasonic phased array probe and process parameters, ring piece water immersion ultrasonic phased array detection is carried out, full-coverage scanning is carried out in a weld joint area, and the scanning position of the probe is recorded in real time through an encoder; in the scanning process, an ultrasonic image scanned by the phased array probe is collected in real time, and the ultrasonic image is transmitted to a pre-trained adaptive noise reduction YOLOv5 target detection model for defect recognition; and the rotating angle position of the ring piece is recorded in real time through an encoder, and when the target detection model finds defects, the defect position is recorded, and alarm information is generated. The method is suitable for ring piece ultrasonic detection noise reduction and recognition, the defect recognition accuracy can be improved, and the manual labor intensity is reduced.

The invention relates to a migratory fly insect intelligent identification method based on trap lamp assisted radar database building. According to the method, insect monitoring data of the moth-killing lamp and the radar in the same night period are fused, the insect data set is established through matching of the two data, and the difficulty of a traditional insect data set database establishment mode in data acquisition is effectively overcome; secondly, a CL-GC-Swin Transform network model is provided, a contrast learning module and a global context block are introduced into the Swin Transform, and training is carried out by using the complete polarization time-frequency characteristic pattern of the insect, so that the characterization capability of the network on the time-frequency characteristic pattern of the insect is significantly enhanced, and the accuracy of insect type identification can be effectively improved. According to the method, the flight characteristics of the insects are directly utilized for identification, complex scattering characteristic calculation and accurate radar calibration are not depended on any more, the requirements for radar system precision and calibration are greatly reduced, and the adaptability and robustness of identification can be improved.

The invention discloses an accelerator for accelerating the reasoning process of an unstructured sparse large language model and an operation method of the accelerator. The accelerator comprises a processor module, a direct memory access module, a memory controller module, a DDR memory module, an interconnection bus module, a calculation core module and a router module. The interconnection bus module is connected with the direct memory access module, the memory controller module and the computing core module; the processor module is connected with the direct memory access module; the DDR memory module is connected with the memory controller module; the router module is connected with the computing core module and the adjacent router module; and the calculation core module obtains to-be-calculated data from the off-chip DDR memory module through the interconnection bus module. According to the method, the limit that data reuse is carried out only along a single row or a single column on a traditional systolic array is broken through, cross-row and cross-column data reuse is achieved, the pressure of hardware equipment is relieved, the positions of non-zero elements are coded through bit masks, and the calculation efficiency is improved.

The invention relates to an isoterpinene 4, 8-epoxide synthesis method, which comprises: blending an isoterpinene raw material, a catalyst, a catalyst auxiliary agent and a solvent, stirring to form a mixture solution, carrying out a mixing reaction on the mixture solution and an oxidizing agent in a reactor, purifying, and drying to obtain the isoterpinene 4, 8-epoxide. And 2, 8-epoxide. According to the synthesis method of the isoterpinene 4, 8-epoxide, an adopted reaction system is moderate in oxidability and mild in reaction condition, double bonds at the fourth position can be directionally oxidized, high oxidation selectivity is achieved, and finally the highest selectivity of the isoterpinene 4, 8-epoxide can reach 95% or above; meanwhile, the method overcomes the defect that the existence of water in a catalytic system in the prior art easily causes ring-opening hydrolysis of epoxidation reaction, accelerates the epoxidation reaction process, shortens the reaction time, and increases the yield of the product, and the highest yield can reach 88% or above.

The invention relates to the technical field of catalysts for gas purification, in particular to a hierarchical pore metal-based catalytic adsorbent as well as a preparation method and application thereof. The invention discloses an integrated preparation method combining a sol-gel method and a template method, which comprises the following steps of: adding a template agent before forming gel, adding a proper amount of ammonia water in an aging process, accurately controlling other reaction conditions and a raw material ratio, and controlling a spatial confinement effect of the template method and a chemical reaction in a sol-gel process to obtain a sol-gel composite material. The morphology and size of the catalytic adsorbent can be accurately regulated and controlled, the hierarchical pore metal-based catalytic adsorbent with a microporous structure as a main material and mesopores and macropores as coexistence is finally prepared, the hierarchical pore structure provides rich adsorption sites and catalytic activity centers, and the hierarchical pore metal-based catalytic adsorbent has high adsorption capacity, high selectivity, good catalytic activity, good stability and easy regeneration.

The invention discloses a double-groove super junction structure and a manufacturing method thereof, the double-groove super junction structure comprises a plurality of MOS cells which are connected in parallel, and each MOS cell comprises a drain electrode, an upper metal source electrode, a grid electrode, a semiconductor epitaxial layer, a substrate layer, a P well layer and an N well layer; a groove is formed between adjacent MOS cells and in the middle of the heavily doped P well layer I through etching, an oxide layer is deposited at the bottom of the groove, a side metal source electrode is arranged on the surface of the oxide layer, and the top of the side metal source electrode is in contact with the upper metal source electrode; the side surface of the side metal source is in ohmic contact with the N well layer, the lightly doped P well layer I and the heavily doped P well layer I; the grid electrode is a longitudinal groove type grid electrode and is arranged between the two N well layers of the single MOS cell, and the grid electrode is connected with the N well layers, the first lightly-doped P well layer and the diffusion layer in an isolated mode through a grid oxide layer. According to the invention, the injection depth of the heavily doped P well layer I is increased through the groove, and the (11-20) surface channel is adopted, so that the interface state density is greatly reduced, and the overall size of the device is reduced.

The invention relates to the technical field of agricultural fertilizers, and particularly discloses a magnesium aluminum silicate mineral derived layered magnesium aluminum bimetallic oxide-silicon oxide composite material as well as a preparation method and application of the magnesium aluminum silicate mineral derived layered magnesium aluminum bimetallic oxide-silicon oxide composite material. Magnesium / aluminosilicate minerals are successfully converted into the layered magnesium-aluminum bimetal oxide-silicon oxide composite material with a high specific surface area and a developed pore structure, and the layered magnesium-aluminum bimetal oxide-silicon oxide composite material is combined with nutrients through a simple and convenient fertilizer preparation process to prepare the slow-release fertilizer. The slow-release fertilizer has the advantages of cheap and easily available raw materials, simple and efficient preparation process, stable slow-release performance, soil improvement effect and the like, and provides an efficient and environment-friendly new way for development of the slow-release fertilizer; the method has important significance for promoting sustainable agricultural development and realizing high-value utilization of silicate minerals in the agricultural field.

The invention discloses a current inversion method for a steel tape armored multi-core cable, and the method comprises the steps: S1, setting a plurality of measurement points at a to-be-measured part of a to-be-measured multi-core cable, building a polar coordinate system with the geometric center of the to-be-measured multi-core cable as an original point, and constructing a position coefficient matrix, a conductor current matrix, and an attenuation coefficient matrix; s2, assigning an initial value to the unknown variable, and calculating to obtain an initial conductor current matrix and an initial attenuation coefficient matrix; s3, searching a local optimal solution of the attenuation coefficient matrix through a random optimization method; s4, constructing a linear equation set taking the conductor current matrix as an unknown variable to solve the conductor current matrix; and S5, after the sampling value of the magnetic induction intensity component is updated, solving the linear equation set, and calculating to obtain the current value of each conductor of the current cable. According to the method, on the basis of the time-invariant characteristic of the magnetization curve, the undetermined coefficient of the approximation function is solved by using the stochastic optimization algorithm, the nonlinear attenuation coefficient of the steel tape armoring of the target cable is solved, the influence of the steel tape armoring on the current inversion result is corrected, and the measurement efficiency and precision can be improved.

The invention belongs to the field of biological pharmacy and biological conversion, and particularly relates to a lipase mutant and application thereof. The lipase CALB mutant disclosed by the invention is obtained by carrying out single-point mutation or combined mutation on the 40th site, the 134 site, the 154 site, the 189th site, the 278th site and the 281 site of an amino acid sequence as shown in SEQ ID NO.1. Compared with a wild type, the mutant has the advantage that the stereoselectivity is greatly improved when the mutant is used for catalyzing racemization 3-cyclohexene-1-methyl formate to produce (S)-3-cyclohexene-1-formic acid. Compared with a traditional chemical method for preparing (S)-3-cyclohexene-1-formic acid, the lipase CALB mutant provided by the invention is high in stereoselectivity, mild in reaction condition, environment-friendly, low in equipment requirement, capable of greatly reducing the production cost and wide in application prospect in industrial application.

The invention discloses an assembly type segmented prestressed concrete tower drum structure and a construction method, the assembly type segmented prestressed concrete tower drum structure comprises a drum body formed by splicing a plurality of concrete drum sections in a segmented mode in the height direction, the diameter of the concrete drum sections is reduced in the height direction of the drum body, and the concrete drum sections are formed by splicing a plurality of prefabricated pipe pieces into a whole through bent bolts. The fabricated prestressed concrete structure is adopted, and the bearing capacity, rigidity and crack resistance of the tower drum are remarkably improved. The segmented prestress can change the prestress value gradient of the tower barrels with different heights, the performance design of the tower barrels is achieved to meet the requirements of different scenes, and the fatigue life and the service cycle of the tower barrels are prolonged. Prefabricated pipe pieces are produced in a factory in a standardized mode, prestress is tensioned, on-site overall prestress tensioning is avoided, the construction efficiency and the construction quality are improved, only embedded bolt connection needs to be completed on site, construction is convenient and fast, connection is reliable, and wide application prospects are achieved.

The invention provides a network construction type photovoltaic system control method supporting active support of power grid frequency, and the method comprises the steps: (1) designing a PV system power reduction operation control strategy which is used for enabling a PV system to reserve power to participate in frequency adjustment of a power grid; (2) designing a PI-based DC bus voltage control strategy for adjusting the DC bus voltage to a reference value; (3) designing a load side step-down operation control strategy based on PI, wherein the strategy is used for stabilizing the DC bus voltage in an off-grid mode; (4) designing a VSG control strategy, and enabling the network-forming inverter to simulate a synchronous generator to participate in active frequency modulation; and (5) in a grid-connected mode, designing a pre-synchronization control strategy, and enabling the grid-forming inverter and the power grid to operate in a grid-connected manner. According to the invention, the frequency stability of the new energy high-permeability power system can be improved. In addition, the method only depends on local information, does not need a maximum power point estimator, a central controller or a solar radiation sensor, and has the advantage of low implementation cost.

The present invention relates to a method for preparing a attapulgite / molecular sieve composite adsorbent, comprising the following steps: (1) using NaX molecular sieve powder as a raw material, adding purified attapulgite, grinding, adding an aluminum source for crystallization, filtering, washing to a pH of 7 to 8, and drying to obtain a attapulgite / molecular sieve composite adsorbent precursor; (2) exchanging the composite adsorbent precursor obtained in step (1) with metal cations, and then filtering, washing, drying, molding, and activating to obtain the composite adsorbent. The composite adsorbent has a simple preparation method, a large adsorption capacity, and good selectivity. It can effectively adsorb and separate liquid mixtures, and has broad application prospects in selectively adsorbing and separating p-xylene from C8 aromatic isomers. The present invention also relates to a attapulgite / molecular sieve composite adsorbent and its application in adsorbing and separating p-xylene in mixed xylene.

The present invention discloses a method for preparing nano-diamonds based on graphene vertical sheets. The present invention utilizes a hot wire chemical vapor deposition system to grow graphene vertical sheets containing tantalum atoms, and transforms the graphene vertical sheets into nano-diamonds under relatively low pressure conditions. The method has the characteristics of mild conditions and low cost. The method has low requirements on equipment, simple process and easy operation. The method has important scientific significance and value for developing a new method for preparing nano-diamonds.

The invention discloses a core-shell structure Au-coated CeO2 nano-catalyst and a preparation method and application thereof, and belongs to the technical field of core-shell structure catalysts.The preparation method of the catalyst comprises the following steps that S1, a chloroauric acid solution and a low-concentration cerium chloride solution are added into deionized water and stirred and mixed at the temperature of 5 DEG C, then an ammonia water solution is rapidly added, stirring and mixing are conducted at the temperature of 5 DEG C, and a mixed solution is obtained; quickly adding a high-concentration cerium chloride solution, and continuously stirring for 30 minutes to obtain a mixed solution; s2, carrying out centrifugal separation on the mixed solution to retain a precipitate, washing the precipitate with deionized water and absolute ethyl alcohol, and carrying out freeze drying to obtain a catalyst precursor; s3, performing cleaning treatment and annealing treatment on the catalyst precursor, and cooling to room temperature to obtain a core-shell structure Au-coated CeO2 nano-catalyst; when the catalyst is applied to catalytic synthesis of the BODIPY fluorescent dye, excellent catalytic performance and recycling performance are shown, and the yield of the BODIPY fluorescent dye can be remarkably increased.

The invention discloses a welding method for a nickel-based alloy composite board. The nickel-based alloy composite board comprises a base material layer and a nickel-based alloy composite material layer, and a transition layer is arranged at the bonding interface of the base material layer and the nickel-based alloy composite material layer. Wherein a trapezoidal groove is machined in the position, corresponding to the base material layer, of the welding section of the nickel-based alloy composite board; a U-shaped groove is machined in the position, corresponding to the transition layer, of the welding section of the nickel base alloy; a groove is not machined in the position, corresponding to the nickel-based alloy composite material layer, of the welding section of the nickel-based alloy composite plate; a nickel-based alloy welding wire matched with the nickel-based alloy composite material layer is used, single argon tungsten-arc welding is adopted for welding the nickel-based alloy composite material layer, and a composite material layer welding seam is formed; a nickel-based alloy welding wire matched with the nickel-based alloy composite material layer is used, the transition layer is welded through single argon tungsten-arc welding, and a transition layer welding seam is formed; and the base material layer is welded to form a base material layer welding seam, and double-tungsten-electrode argon arc welding is adopted for welding the first welding bead of the base material layer.

The invention discloses a polymer dual-band refractive index sensor based on a continuous domain bound state and a manufacturing method of the polymer dual-band refractive index sensor. The sensor comprises a silicon dioxide substrate and polymer metasurface structure units distributed on the upper surface of the silicon dioxide substrate in an array mode. Each polymer metasurface structure unit comprises four positive polygonal cylinders and a cylinder, the four positive polygonal cylinders are identical in size, the positive polygonal cylinders and the cylinder are perpendicular to the silicon dioxide substrate, the positive polygonal cylinders are arranged in a matrix mode, and the cylinder is located in the center of the four positive polygonal cylinders. The introduction of the central cylinder not only breaks the structural symmetry to excite the quasi-BIC, but also enhances the coupling effect among the four straight square columns, thereby greatly improving the near-field enhancement effect. The refractive index sensor has the characteristics of double quasi-BIC sensing wavebands, high sensitivity, high Q value, polarization insensitivity and the like, and the detection efficiency, flexibility and accuracy of the refractive index sensor in the biomedical field are improved.

The invention discloses a method for locating the position of a software problem source code through a log and electronic equipment, and the method comprises the steps: obtaining log output points of target software, creating an index record for the log output points, detecting the source code position information of each log output point, analyzing the log content of each log output point based on the source code position information, extracting and generating characteristic values corresponding to the log content, constructing a log index database, receiving an actual running log, extracting the characteristic values of the log, performing matching in the log index database to determine the position of a source code corresponding to a log output point, and positioning the specific position of the source code according to a matching result. According to the method, the code performance and readability are improved, the method does not depend on code position information output in the log, the requirement for the log format is lowered, the code readability is enhanced, and the integrity of the log is improved by scanning the code and proposing suggestions for improving the log.

The invention relates to a method for preparing spinnable mesophase pitch and carbon fibers from coal tar fractions, and belongs to the technical field of carbon materials. The method comprises the following steps: distilling and extracting aromatic hydrocarbon fractions in different distillation ranges from coal tar, activating the aromatic hydrocarbon fractions in one or more distillation ranges as raw materials, and carrying out non-catalytic polymerization reaction on one or more activated coal tar fractions and one or more non-activated coal tar fractions at a low temperature, and performing high-temperature polymerization reaction to obtain matrix asphalt, and performing reduced pressure distillation treatment, solvent extraction or inert gas purging to obtain the spinnable mesophase asphalt. The spinnable mesophase pitch has wide-area streamline optical texture distribution, good directional arrangement and orderliness, the mesophase content can reach 100%, the softening point is low, the coking value is high, the ash content is low, and the structure is controllable. The carbon fiber prepared based on the mesophase pitch is short in required oxidation time and has excellent performance.

The invention belongs to the technical field of navigation, and discloses an unmanned pod strapdown inertial reference system moving base rapid alignment method which is suitable for rapid initial alignment of a strapdown inertial reference system with GNSS external observation information in the moving process. A more accurate initial attitude is obtained through an optimization algorithm based on singular value decomposition, and the error convergence time is shortened; through a backtracking alignment mode, data of a coarse alignment stage of the strapdown inertial reference system is used for a fine alignment stage, the alignment precision can be improved within limited alignment time, the process can be completed only by storing a small amount of data, the requirement for a computing platform is reduced, and meanwhile, the accuracy of alignment is improved. By designing the invariant Kalman filter, the problem of inaccurate error estimation caused by high system instability under a dynamic condition is solved, and the method has important engineering practice significance.

The invention discloses a single-frequency pulse laser source multi-dimensional imaging system and method, and belongs to the technical field of laser radars. The imaging system comprises a single-frequency pulse laser source module, an optical imaging module, a frequency shift and phase modulation module, a time sequence control module and a data processing module, the single-frequency pulse laser source module emits a detection light beam, a first local reference light beam and a second local reference light beam, and the detection light beam irradiates a target to generate a reflection light beam; the time sequence control module controls the three light beams to perform synchronous frequency shift, so that the first local reference light and the reflected light beam are coherent in the optical imaging module to form a holographic image, and the second local reference light beam and the partially reflected light beam generate a beat frequency signal in the frequency shift phase modulation module; the data processing module analyzes the beat frequency signal so as to adjust the initial phase and frequency of outgoing of the detection light beam, and dynamic coherent imaging of the reflected light beam and the first local reference light in the optical imaging module is ensured; and real-time information of the holographic image is analyzed, and a high-quality three-dimensional image is reconstructed.

The invention discloses a power semiconductor device continuous switch test circuit and method, and relates to the field of power electronics, and the test circuit comprises a current generator which is used for generating a test current; the voltage balance module is used for generating test voltage; the auxiliary module is connected with the current generator and the voltage balance module and is used for providing test voltage and test current required in a continuous switching state for the power semiconductor device T1 to be tested; the capacitor discharging module is used for controlling the magnitude of voltage connected to the two ends of the power semiconductor device T1 to be tested; wherein the voltage balance module comprises a power semiconductor device Tc2 and a capacitor C1; the power semiconductor device Tc2 controls the capacitor C1 to apply voltage to the inductor L in the auxiliary module, and the voltage at the two ends of the inductor L is balanced. According to the application, the continuous switching condition simulation of the power semiconductor device T1 to be tested is met, and voltage and current stress decoupling is realized, so that a voltage source does not need higher voltage stress, and the requirement on a power supply is reduced.

The invention provides a process for optimizing the grain size grade difference of a large-size nickel-based superalloy bar, and belongs to the technical field of nickel-based superalloy bar manufacturing. The process comprises the following steps that S1, raw materials are weighed and smelted to obtain an electroslag ingot; s2, uniform diffusion annealing is carried out; s3, heating before forging to obtain a forging stock; s4, the forging stock is subjected to two times of drawing-out and two times of upsetting treatment, and a semi-finished product is obtained; and S5, the semi-finished product is continuously drawn out, and the bar is obtained. Through the integral design of the whole process scheme such as component design, four-section type diffusion annealing and setting of the forging temperature and the environment temperature, the thermal deformation resistance during forging is greatly reduced, center grains are refined, the grain size grade difference from the edge to the core of the GH4169 bar is controlled within the 1.5 grade, and the process is feasible, low in cost and suitable for large-scale production. The problem that the grain size grade difference of the nickel-based superalloy bar with the diameter larger than or equal to 350 mm is large is solved for the first time.

The invention discloses an automatic detection method for three-dimensional information of a segment steel mold. The automatic detection method comprises the following steps: S1, constructing a detection device and a system; s2, establishing a movable axis coordinate system Q; S3, calibrating a coordinate system relation; s4, confirming a coordinate system transformation relation between the structured light 3D camera and the tracker; s5, the optical tracker identifies and captures the position information of the self-luminous tracker; s6, a teaching detection step: enabling the structured light 3D camera to collect 3D point cloud information of the detection area; s7, a system automatic detection step; and S8, collecting the point cloud data of all the detection areas, and converting the point cloud data into an optical tracker coordinate system to obtain global point cloud data of the segment steel mold. And according to the global point cloud data of the segment steel mold, analyzing vertex position information, line segment position information and plane position information of the detection area, and according to an analysis result, outputting a detection report of the segment steel mold. Three-dimensional information of the inner cavity of the large-size steel mold is automatically collected and detected, and field installation and maintenance are facilitated.

The invention relates to the field of semiconductor lasers and deep learning, and discloses a DFB laser spectral parameter reverse design method based on a DNN model, which comprises the following steps: giving spectral parameters of a DFB laser, and obtaining a threshold spectrum of the DFB laser through a transmission matrix method; extracting characteristic parameters of the threshold spectrum; recording values of the characteristic parameters and spectral parameter values of the corresponding DFB laser to generate a data set; initializing the weight and the back propagation error of the DNN model by adopting a particle swarm algorithm; inputting the data set into the initialized model for training; giving a target threshold spectrum, and extracting characteristic parameters; and inputting the characteristic parameters into the trained model, outputting spectral parameters of the DFB laser, and realizing reverse design of the spectral parameters. The method provided by the invention can reduce the tedious operation of acquiring the threshold spectrum by using a spectrograph for many times, improves the accuracy, and reduces the used time and memory proportion, thereby optimizing the spectral characteristics more quickly and more accurately.

According to the nitrogen hydrochloride # imgabs0 # stine eye drops for treating allergic conjunctivitis and the preparation method of the nitrogen hydrochloride # imgabs0 # stine eye drops, the prepared eye drops can interact with the mucous layer on the surface of keratoconjunctiva by selecting specific solid lipid and a surfactant and controlling the dosage of the solid lipid and the surfactant; the retention capacity of the medicine in front of the cornea is prolonged, so that the medicine has good targeting property, the continuous release of the medicine is realized, the medication frequency can be reduced, the toxic and side effects of the medicine are reduced, the bioavailability is improved, the medication compliance of a patient is enhanced, and in the preparation and long-term storage processes, the medicine has better stability, and is suitable for popularization and application. Therefore, the problems of excessive drug due to multiple administration and poor stability of the active component nitrogen hydrochloride # imgabs1 # stine are solved.

The invention relates to the technical field of laser, in particular to an on-chip series edge-emitting semiconductor laser array and a process method. The on-chip series edge-emitting semiconductor laser array sequentially comprises a semi-insulating substrate, a non-doped buffer layer, a P-type heavily doped layer, a P-type tunnel junction layer, an N-type tunnel junction layer, an N-type cladding, an N-type waveguide layer, an active region, a P-type waveguide layer, a P-type cladding and a P-type cover layer from bottom to top. Table surfaces on the two sides of each light-emitting unit are deeply etched to the P-type heavily doped layer, and a lateral current diffusion suppression groove is formed between the bottoms of any two adjacent light-emitting units. An on-chip series edge-emitting semiconductor laser array structure is adopted, the parasitic effect is reduced through coplanar electrode design, upper and lower electrodes can be prepared through a single process to reduce the cost, lateral current diffusion suppression grooves are formed between light-emitting units to reduce crosstalk, the light-emitting units are connected in series to work under the same injection current, and the light-emitting efficiency is improved. The requirements of a driving circuit can be effectively reduced, and light-emitting uniformity is improved.

The invention discloses a three-dimensional graph rendering method based on a graph theory, and the method comprises the steps: taking object individual attribute elements in a three-dimensional graph scene as nodes, taking object relation attribute elements as edges, and constructing the three-dimensional graph scene into a graph G (V, E); wherein V represents a set of nodes, and E represents a set of edges; simplifying and segmenting the graph G (V, E) by adopting a minimum spanning tree or a clustering algorithm in a graph theory to form a plurality of three-dimensional graph sub-scenes which can be respectively and independently rendered; obtaining the rendering priority of each three-dimensional graphic sub-scene based on the topological structure of the three-dimensional graphic scene; and sequentially rendering the three-dimensional graphic sub-scenes based on the rendering priorities. According to the method, the three-dimensional graphic scene is represented as the graph G (V, E) based on the graph theory, and the calculation amount of single rendering is reduced by simplifying and segmenting the graph G (V, E); meanwhile, the rendering sequence is optimized in combination with the topological structure of the three-dimensional graphic scene, unnecessary calculation is remarkably reduced, and the rendering speed is increased.

The invention relates to the technical field of indoor positioning, and discloses an indoor positioning method, equipment and a medium. The method comprises the steps that each LED lamp is coded according to the flicker frequency of the LED lamps, and the coded content is used for transmitting the position information of each LED lamp in the indoor space; imaging images of the N LED lamps are obtained through shooting of an event camera, and light intensity changes, generated by flickering of the LED lamps, of each pixel point in the imaging images are captured, so that an LED lamp flickering event is obtained; decoding the coding content of each LED lamp through the obtained LED lamp flicker event to obtain the position information of each LED in the indoor space; finally, the position information of the mobile station in the indoor space is obtained through the relation between the position information of the N LED lamps in the indoor space and the position information of the event camera in the indoor space, indoor positioning is achieved, and the positioning precision is high.