80results about How to "Meet stringent requirements" patented technology

The invention discloses a double-frequency constant-temperature crystal oscillator and a manufacturing method thereof, and relates to the technical field of crystal oscillators, and the double-frequency constant-temperature crystal oscillator comprises a ceramic base and a ceramic bottom plate which are integrally formed by adopting an LTCC (Low Temperature Co-Fired Ceramic) process; the high-frequency quartz crystal and the low-frequency quartz crystal are respectively arranged in independent closed cavities, and unified heating and accurate temperature control are realized through the high-heat-conduction diamond copper substrate, the metalized heat conduction holes and the partitioned temperature sensing chips; the two paths of signals are output through independent interconnection paths, and the crosstalk is lower than-50dBm. According to the invention, the dual-frequency high-stability low-noise output is realized under the similar volume, and the requirements of a flight control system on a high-integration-level and high-reliability frequency source are met.

This invention discloses a method for enhancing and controlling the radiation of an LPP-EUV light source based on dual-pulse spatiotemporal co-constraint, belonging to the field of semiconductor manufacturing technology. This invention obtains a spatiotemporal reference by real-time monitoring of a liquid metal droplet, uses a pre-pulse laser to induce target material deformation into a fogged target cloud, and combines high-speed imaging and a hydrodynamic model to predict the time and coordinates of the target cloud's energy absorption peak. It dynamically adjusts the delay time and optical axis direction of the main pulse laser to achieve dual-pulse spatiotemporal co-constraint, and constructs a closed-loop control system through a recursive least squares algorithm with a dynamic forgetting factor. This invention effectively improves the extreme ultraviolet light conversion efficiency, controls the power fluctuation of the light source within ±0.5%, and extends the maintenance cycle of optical components by 2 times. It can be widely applied to next-generation high-power extreme ultraviolet lithography light source systems, meeting the application requirements of semiconductor miniaturization processes.

The invention relates to a corrosion-resistant cable sheath material and a preparation method thereof, and relates to the technical field of cable materials, the corrosion-resistant cable sheath material comprises the following raw materials by weight: 95-105 parts of a base material, 5-10 parts of polyvinylpyrrolidone, 10-18 parts of modified zinc oxide, 1-2 parts of an antioxidant, 0.4-0.8 part of a vulcanizing agent, and 4-8 parts of a plasticizer. Compared with the prior art, the special modified zinc oxide and the polyvinylpyrrolidone in a proper K value range are mainly introduced, and all the components have a synergistic effect, so that the corrosion-resistant stability of the material is remarkably improved, the service life of the cable is prolonged, and the use requirements in the field of submarine underwater cable sheaths are met.

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

The utility model belongs to the field of bar rolling technology relates to a kind of high-precision special steel bar reducing sizing production system, including two two-high rolling mill, two three-high rolling mill, water tank after reducing sizing and finished product collection system being sequentially arranged along the rolling direction.The utility model is innovatively configured with the combination of 2 two-high rolling mill of low cost and 2 high-precision three-high rolling mill, and an efficient reducing sizing production system is constructed.Compared with traditional three-high rolling mill system, this design significantly reduces the number of expensive three-high rolling mill, thereby reducing equipment purchase and maintenance costs.At the same time, two high rolling mill leads the primary rolling of large-scale bar, effectively reducing energy consumption and production cost.This configuration ensures product precision while significantly optimizing cost structure, especially suitable for production scenarios with high economic requirements.

The invention relates to the technical field of high-performance polymer materials, in particular to low-dielectric and high-temperature-resistant modified cyanate ester resin and a preparation method thereof. Advantages and characteristics of bisphenol A type cyanate ester monomers and bisphenol M type cyanate ester monomers are combined, and the dielectric property and the thermal stability are remarkably improved. Diallyl bisphenol A is introduced as a network structure modifier, the phenolic hydroxyl group of the diallyl bisphenol A adjusts the curing reaction rate, and the allyl and bisphenol A structures of the diallyl bisphenol A finely regulate and control the rigid-flexible balance of a cross-linked network through chemical copolymerization, so that the curing process is controllable and the final network structure is optimized. Meanwhile, a toughening system is innovatively designed, epoxy-terminated liquid nitrile rubber is adopted for toughening, stable micron-scale rubber particles are formed in a resin matrix in a chemical bonding mode, and the fracture toughness is improved. The modified resin has excellent dielectric properties, high heat resistance and a wide process window, and meets the strict requirements of a new generation of low observability aircrafts on a bearing-stealth integrated composite material matrix.

The invention discloses a polypropylene film suitable for a film lamination method and a preparation method of the polypropylene film. The polypropylene film comprises the following components in parts by weight: 85.6-91.85 parts of polypropylene; 4-7 parts of long-chain branched polypropylene; 4-7 parts of a compatibilizer; 0.05 to 0.1 part of a nucleating agent; and 0.1 to 0.3 part of an antioxidant. Firstly, polypropylene is selected, so that the wettability of a melt to carbon fibers is effectively improved, and the filling defect caused by high viscosity of a traditional material is overcome; and secondly, the compatibilizer is introduced to form firm chemical bonding with the fiber surface, so that the interface bonding strength is greatly enhanced. And finally, by combining a precise extrusion and casting process, the prepared polypropylene film is uniform in thickness, excellent in interface performance and suitable for a film lamination method.

The invention relates to a preparation process for producing water for injection based on a hollow fiber deoxidation membrane, and belongs to the technical field of preparation of water for injection medicines. According to the preparation process of the water for injection, dissolved oxygen in a water body can be stably removed, reproduction of microorganisms, bacteria and the like in the water can be effectively restrained by strictly controlling the content of oxygen and carbon dioxide in the water, meanwhile, due to removal of carbon dioxide in the water body, the conductivity of the water body is further reduced, the pH value of the finished water is stabilized to be 6.5-7.5, and the water quality is improved. The related industrial standards of the water for injection are met, and the content of microorganisms and endotoxin meets the strict requirements of the 2025 edition pharmacopoeia. Compared with a traditional distillation method, the membrane method integration process does not need to consume a large amount of industrial steam, energy consumption can be remarkably reduced, and the operation cost is reduced; by optimizing the position of the hollow fiber deoxidation membrane device, the water quality and the storage stability of the water for injection can be improved, and the production cost and the maintenance cost can be reduced.

The invention discloses a method for manufacturing a copper-block-embedded double-sided printed circuit board, which comprises the following steps of: slotting a core board, and controlling the slot precision within + / -50 microns; the core plate is placed on a marble platform, the copper blocks are placed in the groove holes, and it is ensured that the flatness of the copper blocks is within + / -12.7 micrometers; plugging the hole with vacuum resin, and pasting a high-temperature adhesive tape to fix the copper block after plugging the hole; the baking plate is vertically placed or fixed by a special jig; a UC type coating drilling tool is used for drilling, a segmented drilling mode is adopted to cope with hardness differences of different materials, and the service life of a drill bit is dynamically set and strictly controlled according to the diameter of the drilling tool, the thickness of a copper block and a laminated plate structure; hole metallization is carried out, full-board electroplating is carried out, and it is ensured that the hole copper thickness is 25-30 [mu] m; manufacturing an outer-layer circuit by adopting a high-precision pattern transfer process; and carrying out surface treatment, molding and electrical testing. According to the manufacturing method of the copper-block-embedded double-sided printed circuit board, the displacement risk of the copper block in a double-sided board structure is reduced by 15% through the measures of marble platform flatness control, vertical board baking and the like, and the problems of copper block fixing, precise drilling and interface reliability are systematically solved.

The invention relates to the technical field of biomedical engineering, in particular to an invasive mouse electroencephalogram data acquisition and analysis system and method. The system comprises a motion structure assembly used for providing a motion carrier for a mouse and collecting motion parameters; the control assembly is used for adjusting motor output according to the target parameter, generating a synchronous time label instruction, recording the actual motion parameter in real time and storing the actual motion parameter in association with the time label; and the data acquisition and analysis component is used for acquiring original electroencephalogram data, synchronously storing a time label, aligning an electroencephalogram sampling time sequence with a motion control time label sequence, extracting electroencephalogram pulse position information, calculating a neuron discharge frequency and establishing a correlation between the discharge frequency and a motion parameter. According to the technical scheme, accurate and synchronous acquisition, automatic alignment of time stamps and multi-dimensional correlation analysis of mouse motion states and electroencephalogram signals can be realized.

The invention relates to a TSN (Time Sensitive Network) timestamp recovery method based on an FPGA (Field Programmable Gate Array), which belongs to the technical field of TSNs and comprises the following steps of: S1, collecting synchronous messages of different TSN nodes in parallel by multiple ports of the FPGA, and analyzing timestamp data by taking a message serial number as an anchor point; s2, constructing an incomplete timestamp matrix and a mask matrix by adopting a time sliding window mechanism, and automatically marking missing data; s3, a random index set is generated through LFSR, and matrix sparse sampling is achieved through a bitmap judgment unit; and S4, based on an FPGA accelerated CUR matrix decomposition algorithm, solving a pseudo-inverse matrix through parallel MGS-QR decomposition, and reconstructing a complete timestamp matrix through block parallel matrix chain multiplication. The FPGA parallel architecture, ping-pong cache and fixed-point number processing are adopted, microsecond-level low-delay recovery is achieved, hardware resource occupation is greatly reduced, robustness in a severe network environment is improved, and the method is suitable for a high-precision clock synchronization scene of an industrial TSN node.

The utility model relates to electrical measurement and automation test technical field, concretely relates to a kind of AC-DC withstand voltage insulation tester, it includes: main control unit, for executing test program and controlling each module coordinated work;High voltage output module, for generating the AC / DC high voltage required by test;Precise current detection module, for detecting the leakage current of measured piece;Multi-channel test interface, for connecting multiple measured equipment;Automatic switching unit, for automatically switching test channel;Data storage module, for automatically recording test data;Man-machine interface, for displaying test information and receiving operation instruction.The utility model is jointly constituted by innovative design an advanced test system with automation, high precision, high efficiency, intelligent management in one, realizes qualitative leap in test quality, operation convenience, production efficiency and safety etc., fully meets the rigorous requirement of modern industry to electrical safety test equipment.

The invention discloses an ammonia-methanol coupling gas production device and a use method thereof, and belongs to the technical field of controllable atmosphere preparation, the ammonia-methanol coupling gas production device comprises a central combustion zone, a peripheral cracking zone and a tail mixing purification zone which are coaxially nested; the central combustion area comprises a hearth wall, and the hearth wall is of a honeycomb-shaped porous heat exchange structure; the peripheral cracking area is arranged on the outer side of the central combustion area, a catalyst bed layer of a spiral flow guide structure is arranged in the peripheral cracking area, and a high-temperature-resistant heat-conducting filling layer is arranged between the catalyst bed layer and the hearth wall of the central combustion area; the tail mixing and purifying area is connected to the downstream of the central combustion area and the peripheral cracking area and used for mixing and purifying combustion products from the central combustion area and cracking gas from the peripheral cracking area. By optimizing a heat exchange interface and a catalyst bed layer structure, the heat transfer uniformity and the response speed are enhanced, so that stable temperature control and preparation of high-purity mixed gas are realized.

The invention discloses a closed CO2 laser adopting diffusion cooling and longitudinal direct current discharge, and belongs to the technical field of laser beam combination, and the closed CO2 laser comprises a vibration suppression component which comprises a beam combination assembly, a laser used for emitting laser beams is arranged in the beam combination assembly, and a reflex reflector used for reflecting the laser beams is arranged in the beam combination assembly. An optical element used for transmitting and reflecting different laser beams is arranged in the beam combining assembly, through accurate light distribution of a reflex reflector and the optical element, reflection and transmission cooperative beam combination of four paths of laser beams with different polarization and different wave bands is achieved, and finally the four paths of laser beams are combined into one laser beam to be output. On the premise of keeping the original beam quality of the single-path laser, the power of the combined beam is increased by several times; and the beam combining light path is accurately matched with the light emitting path of the laser, additional optical loss is avoided, the light spot uniformity, the coaxiality and the polarization characteristic of the combined laser beams are guaranteed, and the strict requirement of industrial precision machining for the quality of the laser beams is met.

The invention relates to a support multi-degree-of-freedom pose monitoring method and device based on machine vision, and the method comprises the steps: collecting a pier top integrated target image, carrying out the graying processing and contour extraction, and carrying out the ellipse fitting of a contour, so as to obtain geometric parameters; screening according to an ellipse inclusion relation to form an identification code unit, establishing a local rounding coordinate system, and degenerating an ellipse into a perfect circle through coordinate transformation; constructing a vector under the rounded coordinate system, calculating a signed included angle, and carrying out normalization processing; performing interval matching based on the normalized angle to decode the unique identifier, and synchronously outputting a high-precision circle center coordinate; and finally, combining at least four identification code circle center coordinates, solving a camera pose by adopting a 3D to 2D point pair projection method (PnP), aligning to a support coordinate system through calibration transformation, and outputting a six-degree-of-freedom pose parameter. Compared with the prior art, the non-contact high-precision pose monitoring is realized, and the method has submillimeter-level measurement precision and strong environmental adaptability.

The application discloses a kind of copper-aluminum composite strip continuous casting and rolling preparation methods of ultrasonic vibration assisted reinforcement, it is related to metal laminated composite material preparation technical field, including preheating treatment to copper strip and control liquidus temperature;The copper strip after preheating is introduced with liquidus into the casting and rolling crystallization area formed by casting and rolling roll and carries out solid-liquid casting and rolling composite;The composite strip obtained after casting and rolling is carried out hierarchical cooling;The composite strip after cooling is sequentially carried out cold rolling finishing and low-temperature stress relief annealing.The application fundamentally eliminates interface pore inclusion and oxide residue, solves the technical problem of large dispersion of bonding strength in conventional casting and rolling process;Grain refinement strengthening and interface structure optimization synergistically improve the interface mechanical properties;Effectively release the interface thermal stress generated by the difference of copper-aluminum thermal expansion coefficient, avoid interface cracking during cooling process;Bonding strength consistency is high, can meet the stringent requirements of new energy automobile battery connecting piece and other high reliability application fields.

This utility model relates to the field of relay technology, and provides an anti-arc safety relay for charging piles, including a relay housing and a coil installed at the center of the bottom of the housing; an iron core, which is slidably inserted into a through hole running vertically through the center of the coil; a transmission column, which is installed at the top of the iron core; a moving contact assembly, which is installed at the top of the transmission column; and two arc-extinguishing components, which are symmetrically installed on the left and right side walls near the top of the relay housing. This anti-arc safety relay for charging piles, through the scientific layout of multi-layer arc-extinguishing grids, a fast-rebound disconnection mechanism, and a buffer reset design, can effectively suppress and quickly eliminate the arc generated between the moving and stationary contacts, significantly improving the safety performance and service life of the relay.

This application relates to an aviation battery, including a casing and an energy storage unit, a support plate, and an electrical unit disposed within the casing. The bottom wall of the casing has spaced-apart limiting strips, and between adjacent limiting strips are spaced-apart height limiting strips with a height lower than the limiting strips. The energy storage unit is placed on the height limiting strips and abuts against two adjacent limiting strips in the length or width direction of the casing. Each limiting strip has an overflow space, which communicates with the gap formed between two adjacent height limiting strips. The support plate supports the electrical unit above the energy storage unit, and the support plate and the energy storage unit are jointly fixed to the bottom wall of the casing by fasteners. This design ensures that the adhesive is evenly spread and excess adhesive is drained during the coating process, meeting the uniformity and controllability requirements of aviation-grade adhesive coating. Simultaneously, the double-layer structure improves spatial integration, reduces the number of fasteners, enhances overall structural stability, and solves the problem of difficult component assembly in confined spaces.

This utility model discloses a concrete pipe pile molding mold with a biodegradable release agent, belonging to the field of mold technology. It includes a shell with an upper plate at the top of its outer surface. A rotating wheel is inserted inside the shell, and a knob is installed at the top of the outer surface of the rotating wheel. A connecting block is sleeved inside the outer surface of the rotating wheel. The mold employs a precise temperature control system using heating wires, allowing the curing temperature to be set according to the concrete characteristics. This avoids gas expansion caused by high temperatures, reducing porosity at the source and ensuring a uniform and dense internal structure of the concrete. A vacuum pump at the top of the housing, along with valves and air pipes, actively extracts air from the pipe during concrete pouring, eliminating internal air bubbles and improving concrete density and waterproof sealing performance. Furthermore, the mold's wear-resistant protective layer and heat-insulating buffer layer effectively extend its service life and maintain stable curing temperature, providing a reliable guarantee for the production of high-performance concrete pipe piles.

The utility model discloses a battery liquid injection port cleaning device in the technical field of lithium ion batteries. The battery liquid injection port cleaning device comprises a vertical moving assembly; the horizontal moving assembly and the dust removal cover are connected to the moving end of the vertical moving assembly; the cleaning nozzle is connected to the moving end of the horizontal moving assembly and is used for spraying a cleaning agent to the battery liquid injection port; the battery positioning jig is used for fixing a battery; and the dust hood is externally connected with a dust remover for removing dust on the surface of the battery. Accurate three-dimensional positioning of the cleaning nozzle can be achieved, it is guaranteed that a cleaning agent is sprayed to a liquid injection opening at the optimal angle and pressure, and cleaning thoroughness is remarkably improved; meanwhile, the dust removal cover is externally connected with an active adsorption function of a dust remover, splashing pollutants and volatile cleaning agents can be captured in real time in the cleaning process, and secondary pollution to the surfaces of the batteries or the workshop environment is effectively avoided; the fixing effect of the battery positioning jig is automatically matched with the moving assembly, the manual intervention requirement is reduced, the cleaning efficiency is improved, and the product damage risk is reduced.

This invention relates to the field of industrial control technology, and more specifically, to a method for precise pressure adjustment in the injection molding holding process based on iterative learning control. The method includes: acquiring a reference holding pressure curve, an actual feedback pressure sequence, and injection molding holding control commands for the current holding stage; calculating thermal hysteresis characteristics characterizing changes in physical state; calculating a thermal drift evolution index characterizing the thermal drift rate; generating a nonlinear adaptive gain adjustment factor constrained within a safe range; and calculating and updating the injection molding holding control commands for the next holding stage. This invention more accurately reflects the comprehensive impact of changes in physical state, scientifically assesses the thermal drift rate and the difference between current and historical data, dynamically adapts to thermal drift to ensure control stability under different thermal conditions, effectively solves the problems of holding pressure overshoot, oscillation, and slow response, improves the dimensional consistency of injection molded products and the control accuracy of the holding process, and ensures production quality and efficiency.

This invention discloses a method and apparatus for magnetocaloric composite treatment of nuclear power plant heat transfer tubes, belonging to the technical field of metal material heat treatment and nuclear energy equipment. The method includes: solution treatment and cooling of Inconel 690 nickel-based alloy raw material to obtain a solution-treated alloy; placing the solution-treated alloy in a magnetic field environment for magnetic field-assisted heat treatment to improve its thermal conductivity; and subjecting the magnetic field-assisted heat-treated alloy to electromagnetic pulse treatment to enhance its tensile strength, ultimately obtaining the target device. This invention effectively solves the technical problem of the mutual constraint between the thermal conductivity and tensile strength of Inconel 690 alloy through a composite process route of "solution treatment - magnetic field-assisted heat treatment - electromagnetic pulse treatment." While improving the thermal conductivity to over 80% of the design value, it ensures that the tensile strength is not lower than the original level or even improved, achieving synergistic optimization of both, meeting the stringent service requirements of steam generator heat transfer tubes, and the process flow is simple.

The utility model belongs to the technical field of lithium ion batteries, and particularly relates to a novel winding needle, which is used for a lithium battery winding process and comprises a winding needle main body, a clamping part of the winding needle main body is arranged at one end of the winding needle in the width direction, and the distance between the clamping part and one end of the winding needle is less than 3mm; the thickness of the winding needle main body is less than 3mm; the surface of the clamping part is in a sawtooth shape; wherein the clamping part is close to one end of the winding needle through eccentric design, so that the length of the hollow diaphragm of the core part is less than or equal to 5mm. According to the utility model, the strict requirement of the novel thermal composite pole group on the length of the hollow diaphragm of the core part is accurately met, the problem of length overrun caused by the centering of the clamping part and the larger thickness of the winding needle in the prior art is solved, and a key tool support is provided for the structure compactness and the performance optimization of the pole group.

This invention discloses an integrated sensing, driving, and control system and method for micro-nano robots based on an optical communication protocol. The system includes a control module and connected optical communication, multimodal sensing, driving, and power management modules. The optical communication module uses a preset protocol to achieve bidirectional conversion between optical and electrical signals. The downlink uses PWM encoding and near-infrared light, while the uplink uses Manchester encoding and blue light. The multimodal sensing module integrates multiple sensors, and the sampling parameters are dynamically configured by the control module. The driving module converts control commands into PWM signals to precisely drive micro-actuators. The power management module switches between working and sleep modes according to commands. The control module is responsible for command decoding and system scheduling. This system achieves efficient collaboration of communication, sensing, driving, and control on a single chip, featuring high integration, reliable communication, low latency, and low power consumption. It provides a core technology solution for the application of micro-nano robots in complex environments such as biomedicine and environmental monitoring.

This invention relates to the field of steel metallurgical refining equipment technology, and particularly to a porous media refining vacuum RH steam superheater burner adapted to coke oven gas. The burner includes a porous media burner adapted to coke oven gas and a control system. The porous media burner adopts a double-layer porous media structure, a fuel pretreatment and mixing system, and a cooling and anti-corrosion / wear-resistant structure. The upper layer of the double-layer porous media structure is pure silicon carbide porous ceramic with a tar catalytic cracking coating on its surface; the lower layer is an alumina-based composite porous material with an internal spiral flow channel. The fuel pretreatment and mixing system employs a Venturi mixer, a cyclone separator, and an electrostatic precipitator. The cooling and anti-corrosion / wear-resistant structure uses a bimetallic composite burner nozzle with a spiral cooling water channel. This invention can accurately match the combustion characteristics of coke oven gas, achieve efficient and clean combustion, and is linked in real-time with the main RH refining production line.

The invention relates to the technical field of laboratory equipment, in particular to a fresh air adjusting system for a clean room. Comprising air supply devices distributed at a ceiling of the clean room in an array mode, each air supply device comprises a shell, a draught fan unit, an air filtering unit and an airflow distribution unit, the draught fan units, the air filtering units and the airflow distribution units are sequentially arranged in the shells from top to bottom, each airflow distribution unit comprises a hollow sleeve, and each hollow sleeve is provided with a bottom air outlet and an annular side air opening. The flow guide cone is provided with a hollow channel and a flow guide slope, the flow guide cone is composed of a plurality of valves, the valves can swing in the radial direction around the lower connecting points of the valves, and an adjusting assembly used for driving all the valves to be synchronously unfolded outwards is arranged at the bottom of the sleeve. Through the annular backflow layer and the adjustable airflow distribution unit, dynamic switching between a composite flow field and vertical laminar flow is achieved, closed-loop circulation and distribution as required of clean air are completed, and global uniformity and process area stability are both considered.

This invention provides a chain hook traction device testing system and method, relating to the field of traction testing systems. Addressing the problem of existing testing machines' difficulty in real-time and accurate monitoring of chain hooks and traction devices during loading tests, a gantry loading frame is installed on a base. Two sets of actuators are installed side-by-side on the lower part of its crossbeam, corresponding to the chain hook testing station and the traction device testing station, respectively. A self-aligning connection component is provided between the actuator and the test piece. This component, utilizing its structural characteristics, can automatically adjust the force axis during loading, thereby effectively improving or eliminating the lateral shear force on the test piece. Non-contact real-time image data acquisition is performed using visual monitoring devices arranged around the testing stations and transmitted to the control console, achieving continuous and safe monitoring of crack initiation and propagation processes. This effectively meets the EN15566 standard's requirements for real-time, accurate, and safe testing under high dynamic loading environments.

The invention discloses a road full-scene rapid reconstruction method based on multi-source parallax control and an adaptive explicit radiation field, and relates to the technical field of three-dimensional reconstruction. Comprising the following steps: collecting multi-source image data by adopting a differentiation strategy aiming at scenes such as roads, bridges and tunnels, and resolving camera poses; the scene is represented by an anisotropic three-dimensional Gaussian ball set, and accurate mapping from three dimensions to two dimensions is realized through a covariance projection formula; gaussian ball attributes are iteratively optimized based on an adaptive density control strategy of a gradient threshold and volume constraint, and automatic cloning / splitting is carried out in a detail area to improve precision; and real-time rendering of more than 60FPS is realized by adopting parallel cardinal number sorting based on image blocks and an Alpha mixed formula. The problems that a traditional method is high in cost, the close shot is fuzzy, the interior and exterior of the tunnel are disjointed, and real-time interaction is difficult are solved, rapid modeling and incremental updating within 24 hours are achieved, and the reconstruction efficiency, the detail fidelity and the user experience are remarkably improved.

The utility model relates to mechanical equipment manufacturing field, concretely relates to a kind of anti-deformation tool for big gear ring heat treatment.The technical scheme is as follows:an anti-deformation tool for big gear ring heat treatment, including support base, support rod, bracing bar head, fixed nut and locating nut, the outer edge of the support base is uniformly distributed with multiple platforms along circumference, the center of each platform is equipped with the screw hole leading to the center, one support rod is screwed in each screw hole, the other end of the support rod is screwed together with bracing bar head;Fixed nut is screwed on one end of the support rod for the position fixation between the support rod and the support base, locating nut is screwed on the other end of the support rod for the position fixation between the support rod and the bracing bar head.The utility model can ensure that big gear ring maintains original size accuracy and shape accuracy during heat treatment process, significantly reduces the scrap rate caused by deformation, meets high-precision production demand, improves production efficiency and product quality.

This application provides a method and system for high-precision positioning and correction of unmanned aerial vehicles (UAVs) based on BeiDou tri-frequency signals. The method first receives a tri-frequency signal group transmitted by the BeiDou satellite navigation system. Then, utilizing the dispersion characteristics of the tri-frequency signal group propagating in the ionosphere, a real-time correction value for ionospheric delay error is generated. Next, multipath effect characteristic data caused by terrain undulations during agricultural surveying operations is acquired. Then, the multipath effect characteristic data is coupled with the real-time correction value to construct a dynamic error suppression model. Finally, the dynamic error suppression model is used to correct the original positioning trajectory of the UAV point by point to output a high-precision positioning result. The technical solution provided by this application not only effectively solves the combined interference problem of ionospheric delay and multipath effect, but also achieves high-precision positioning of UAVs in complex agricultural terrain environments, significantly improving the accuracy and environmental adaptability of the positioning results.