130results about How to "High industrial application value" patented technology

The invention belongs to but not limited to the technical field of fault diagnosis and maintenance of power equipment, and discloses an intelligent diagnosis and maintenance system and method for power equipment based on a knowledge graph. A data acquisition and preprocessing module acquires real-time operation data and historical data of the power equipment; the knowledge graph construction module associates various kinds of information of the power equipment to construct a knowledge graph; the intelligent diagnosis module performs association analysis on power equipment faults based on a knowledge graph and a machine learning algorithm, identifies fault modes and potential faults, and predicts possible faults of the equipment; the maintenance suggestion module automatically generates a detailed maintenance scheme according to the diagnosis result; the operation and maintenance visualization module provides visual fault diagnosis results and maintenance suggestions, supports multi-level data display, and helps operation and maintenance personnel to clearly understand the equipment state. The operation safety of the power equipment is improved, the operation and maintenance cost is remarkably reduced, and the overall efficiency of equipment management in an intelligent power grid environment is improved.

The invention provides a self-adaptive workpiece grabbing pose correction method and system based on feature point matching. The method comprises the steps that a standard image of a workpiece which is successfully grabbed to a jig and an auxiliary image of the workpiece which is not successfully grabbed to the jig are shot; the template image and the auxiliary image are processed, feature points in the images are recognized and compared, matched feature points between the template image and the similar image are found out, and three-dimensional coordinates matched with the feature points are obtained; and based on the matched feature points and the three-dimensional coordinates of the feature points, the pose of the workpiece is solved through an RANSAC PNP algorithm, the pose of the current unsuccessfully grabbed workpiece relative to the position of the template drawing is recovered, and it is ensured that the workpiece can be accurately placed on the jig by adjusting the pose of the mechanical arm. And through feature extraction and matching of the SIFT algorithm and the LightGlue algorithm, accurate and effective correction of the workpiece placement pose is achieved, important industrial application value and market potential are achieved, and powerful technical support is provided for improving the placement precision and efficiency of the mechanical arm.

The invention discloses a lithium hexafluorophosphate production control system and a method thereof, and relates to the technical field of lithium hexafluorophosphate production, and the method specifically comprises the following steps: obtaining crystallization dynamic information of each area in a reaction kettle in a lithium hexafluorophosphate crystallization process in real time, and analyzing after obtaining to obtain a crystallization dynamic result; respectively generating a crystal growth driving force coefficient and a particle uniform distribution index of each region; constructing a particle size distribution evaluation model for the generated crystal growth driving force coefficient and particle uniform distribution index of each region, generating a particle size distribution coefficient of each region, and performing comprehensive analysis after generation to generate an evaluation coefficient; and analyzing the generated evaluation coefficient, and evaluating the uniformity degree of particle size distribution in the reaction kettle in the lithium hexafluorophosphate crystallization process. The problem of uneven particle size distribution in the lithium hexafluorophosphate crystallization process is solved, and the effect of improving the particle size uniformity and the product quality stability is achieved.

The invention relates to a preparation method of (R)-3-amino-1-oxa-8-azaspiro [4.5] decane-8-carboxylic acid tert-butyl ester, which comprises the following steps: carrying out Grignard reaction on N-BOC-4-piperidone and allyl magnesium halide to obtain an intermediate 1; carrying out substitution reaction on the intermediate 1 and 3-halogenated propylene to obtain an intermediate 2; performing olefin metathesis reaction on the intermediate 2 under the action of a Grubbs catalyst to obtain an intermediate 3; carrying out nitration reaction on the intermediate 3 and nitric acid to obtain an intermediate 4; carrying out hydrogenation reduction reaction on the intermediate 4 to obtain a racemic intermediate 5; and carrying out chiral resolution on the intermediate 5 by using a resolving agent to obtain a target product. The preparation method provided by the invention is short in process route and simple to operate, does not generate a large amount of waste water and waste gas, and can achieve higher total product yield and chemical and chiral purity.

The invention belongs to the technical field of coal mines, discloses a method and a system for determining key pressure injection parameters of liquid CO2 for preventing oxidation of residual coal in a goaf, and aims at taking a coal mine as a research object, and obtaining comprehensive basic data by measuring the inclination length and mining height of a working face and the air distribution amount of the working face in detail. Meanwhile, the oxygen concentrations of different burial depths of the air inlet side of the working face in the test area are measured, and the pressure injection amount of the liquid CO2 and the inhibition effect of the liquid CO2 on coal seam oxidation can be analyzed more accurately in combination with oxygen concentration distribution in the actual coal mine environment. By analyzing the pressure injection period of the liquid CO2, the oxidation reaction of the residual coal is effectively controlled on the premise of not influencing the normal coal mine production. The method not only can be used for fire extinguishing and oxidation control under emergency conditions, but also can use a liquid CO2 injection technology as a daily prevention and control measure, so that the efficiency of coal mine safety production is improved, the risk of fire caused by oxidation is reduced, and the method has a wide industrial application prospect.

The invention discloses a cavity antenna of a notebook computer shell. The cavity antenna comprises a metal shell cover with a rectangular opening area. The cuboid cavity is installed on the machine shell cover and embedded in the rectangular opening area. The cavity is provided with four metal side faces, a metal bottom face and an opening face, the opening face is opposite to the metal bottom face, and the opening face and the rectangular opening area are located on the same plane. The double-sided printed circuit board is provided with a feed-in surface and a coupling surface, the feed-in surface coincides with the opening surface and is superposed on the cavity, and the periphery of the feed-in surface is welded on the side surface of the cavity. The coaxial line penetrates through one metal side face, the center conductor is connected with an excitation circuit of the feed-in face, and the outer layer conductor is connected with a grounding circuit of the feed-in face and conducts the four metal side faces. The excitation circuit is coupled with the slot line block, the first high-frequency block and the second high-frequency block of the coupling surface, the slot line block is connected with one of the four metal side surfaces, and the first high-frequency block and the second high-frequency block are in floating connection. The shielding effect can be reduced.

The invention belongs to the technical field of atmospheric science, and discloses a set-variational hybrid assimilation system and method based on a meteorological large model, which adopts a physical constraint mode (RANDOMMV) to perform random disturbance on an atmospheric initial field, quickly generates set members based on the strong deduction capability of the artificial intelligence meteorological large model, and improves the set-variational hybrid assimilation efficiency. The member diversity is ensured; and the sampling error is reduced. On the basis, a set-variation hybrid assimilation method is adopted, and a set-variation hybrid assimilation system is constructed by combining a dynamic set background error covariance and a static background error estimated through an NMC method, so that effective assimilation of the multi-source observation data is realized. According to the method, the physical consistency and stability of the AI ensemble forecast members can be ensured. Long-term average static error information derived from a difference field of historical forecast data and flow dependent background error information of ensemble forecast are combined; and dynamic and static combination enhances the robustness of the hybrid assimilation system.

The invention discloses a fiber-reinforced wave-absorbing patch and a preparation method and application thereof, the wave-absorbing patch comprises a three-layer structure, the middle layer is impregnated reticular fiber as a reinforcing matrix, the upper layer and the lower layer are single-layer wave-absorbing patches, and the fiber-reinforced wave-absorbing patch with a latticed surface is prepared after lamination and hot pressing. A wave-absorbing agent adopted in the fiber-reinforced wave-absorbing patch comprises at least one of carbonyl iron, iron-silicon-chromium, iron-silicon-aluminum, iron-nickel, cobalt-based amorphous wires and iron-based amorphous powder. The invention provides a novel wave-absorbing solution with excellent electromagnetic wave-absorbing performance, mechanical strength and good processing adaptability, and the prepared fiber-reinforced wave-absorbing patch integrates an advanced wave-absorbing material technology and a fiber-reinforced composite structure design. The device is specially used for suppressing electromagnetic radiation, improving electromagnetic compatibility and protecting electronic equipment from electromagnetic interference.

The invention relates to the technical field of fluorine-containing chemicals, and provides a perfluoroketone compound as well as a preparation method and application thereof, the structural formula of the perfluoroketone compound is as shown in # imgabs0 #, and Rf1, Rf2 and Rf3 are the same or different and are independently selected from C1-C8 straight-chain or branched-chain perfluoroalkyl groups. The perfluoroketone has the beneficial effects that the carbon number of the perfluoroketone is controllable, and perfluoroketones with different boiling points can be obtained according to requirements; according to the method for preparing the perfluoroketone compound, the adopted raw materials are low in cost, good in safety and stability, non-toxic, harmless and easy to store, the reaction process is controllable, the selectivity is high, products are easy to separate, aftertreatment is simple, and the method is suitable for actual technological production; the perfluoroketone provided by the invention has a relatively low dielectric constant and relatively good heat transfer performance, is non-combustible, and has a very good application prospect in the aspects of semiconductors, refrigeration systems and fire fighting.

The invention discloses a silicon nitride crystal based on a physical vapor transport method and a preparation method thereof, and the preparation method comprises the following steps: laying silicon nitride powder as a raw material at the bottom of a graphite crucible, fixing a seed crystal on a top cover of the crucible, placing the device in single crystal growth equipment, vacuumizing, heating to 1000-1300 DEG C, filling nitrogen to 800-1000 mbar, and preserving heat for 1-3 hours, the method comprises the following steps of: heating to the temperature of between 1,600 and 2,000 DEG C, inhibiting the decomposition of silicon nitride, continuously heating to the temperature of between 1,600 and 2,000 DEG C, adjusting the air pressure in equipment to 100 to 300 mbar, and promoting the silicon nitride to be decomposed into silicon steam and nitrogen. And controlling the temperature of a seed crystal area to be 1500-1700 DEG C and the axial temperature gradient to be 10-50 DEG C / cm, so that Si and N substances in a gas phase are crystallized on the surface of the seed crystal to generate a silicon nitride crystal. And after the crystal grows, filling inert gas and slowly cooling to room temperature to finally prepare the complete silicon nitride crystal. The preparation method disclosed by the invention is accurate in process and high in crystal quality, and the prepared silicon nitride crystal has the particle size of more than 500 microns and the purity of more than 5N, and is suitable for the field of application of high-end materials.

The invention provides a method for preparing alkyl naphthalene by using a metal organic framework as a catalyst and application of the alkyl naphthalene. The method comprises the following step: in the presence of a metal organic framework catalyst, alpha-olefin and naphthalene and / or methylnaphthalene are subjected to an alkylation reaction to obtain alkyl naphthalene. The invention also provides application of the alkyl naphthalene prepared by the method for preparing the alkyl naphthalene by using the metal organic framework as the catalyst as base oil of V-type lubricating oil. The alkyl naphthalene is prepared by adopting the MOFs catalyst, the catalyst has large pore channels, and the catalyst is high in catalytic activity, long in service life, free of pollution and not prone to corroding equipment in the preparation process of the alkyl naphthalene.

According to the foaming agent containing minoxidil and finasteride provided by the invention, micronization of raw material medicines and complicated preparation procedures such as homogenization are not needed in the preparation process, liquid medicine liquid is directly prepared and then is filled, and a propellant is added to prepare the foaming agent, so that the foaming agent has the advantages of few impurities, uniform medicine liquid and high stability; the invention has the advantages of strong foam adhesiveness, prolonged action time of the medicament on the scalp, uniform and non-greasy application, quick defoaming to enhance the curative effect, strong permeability, effective penetration of the medicament into the skin or mucous membrane to improve the bioavailability of the medicament, and the like. The preparation method is simple and easy to operate, time and cost can be greatly saved, meanwhile, the dosage form of the foaming agent has the advantages of being easy to smear, few in residue, capable of being smeared in a large area and the like, patient compliance is improved, use is convenient, the two active ingredients with different action mechanisms are in synergistic interaction, and the clinical effect is improved.

The invention provides a preparation method for preparing dibutyltin dilaurate through a solvent-free method, and relates to the technical field of chemical engineering. According to the preparation method of dibutyltin dilaurate, a predetermined amount of coconut oil acid and dibutyltin dichloride are obtained, the uniformity of a mixture is kept through stirring equipment, and sufficient contact of reactants is ensured; in the process of dropwise adding the sodium hydroxide solution, the reaction temperature is kept stable through a temperature control device; after the pH value is adjusted, separating out lower-layer saline water by using a separating funnel, and adjusting the separation speed and efficiency by controlling a valve to ensure thorough separation; obtaining a separated product, and heating the product in a vacuum environment; and after drying, filtering the product to obtain the final dibutyltin dilaurate. Dibutyltin dichloride and alkali liquor are used. The dibutyltin dichloride is liquid and is simple, convenient and safe to use, redundant solvents are not needed in the reaction process, safety and environmental protection are guaranteed, the dibutyltin dichloride is directly used as the raw material in the process, one-step reaction is achieved, and efficiency is improved.

The application provides a measuring equipment monitoring device, a monitoring adjustment method, a thickness measurement method, a terminal and a medium, wherein the measuring equipment monitoring method comprises a repeatedly executed monitoring adjustment process; a single monitoring adjustment process comprises: measuring a reference wafer by a measuring equipment to obtain a monitoring data set; comparing the monitoring data set with a reference data set to obtain a difference condition; if the difference condition between the thickness monitoring data and the thickness reference data meets a thickness imbalance condition, performing alignment positioning adjustment on the measuring equipment; and if the difference condition between the warping monitoring data and the warping reference data meets a horizontal imbalance condition, performing horizontal adjustment on the measuring equipment. Through the repeatedly executed monitoring adjustment process, the state of the measuring equipment is monitored and maintained, the error of the measuring equipment is prevented from being too large, and the measurement accuracy of the measuring equipment is improved.

The application discloses a multi-level switching type water chiller-water curtain composite cooling system and a segmented cooling control method thereof, and relates to the technical field of intelligent control. The system comprises a water chiller unit, a water curtain evaporative cooling module, a sensor network and an intelligent control module. The application introduces latent heat utilization rate η as a core control variable to quantitatively depict the actual efficiency of the water curtain evaporative cooling. The intelligent control module is embedded with a five-segment energy level division unit, and the system operating state is divided into five preset levels, namely, pure water curtain, ice machine cold compensation, parallel load sharing, ice machine main reduction and pure mechanical refrigeration, according to the η value. Each level corresponds to the linkage control parameters of the water chiller load rate, the water curtain outlet water temperature and the fan speed. The application also integrates LSTM time sequence prediction feedforward control, lag compensation and boundary anti-oscillation mechanism. The application solves the core problem of the existing composite cooling system that the energy efficiency suddenly drops under high temperature and high humidity conditions, and maintains a high energy efficiency ratio in the whole working condition range.

The invention belongs to the technical field of freight unmanned aerial vehicle delivery, and relates to an intelligent cabin door system for an unmanned aerial vehicle and a cabin door structure design method. The system comprises a driving system, a reel system, a curtain plate system, a sliding rail unit and a control unit. The control unit is electrically connected with the driving system; the driving system is arranged on the unmanned aerial vehicle body; the curtain plate system is connected with an unmanned aerial vehicle body through the sliding rail unit, the curtain plate system is connected with the reel system, the driving system is in transmission connection with the reel system through a chain wheel transmission structure, and the driving system drives the reel system to rotate so as to drive the curtain plate system to stretch or retract along the sliding rail unit. Opening and closing of the cabin door are realized. According to the invention, the number of moving parts is greatly reduced, the probability of clamping stagnation and wear failure of a mechanical transmission mechanism is fundamentally reduced, and the operation reliability of a cabin door system in harsh operation scenes such as emergency logistics and disaster rescue is remarkably improved.

The utility model provides a scrap edge collecting device of a coil stock splitting machine. Relates to the technical field of coil stock splitting machines, the scrap edge collecting device of the coil stock splitting machine comprises a storage box, a collecting box is slidably installed in the storage box, a side edge block is fixedly installed on one side of the storage box, a first electric motor is arranged at the bottom of the side edge block, and a connecting frame is fixedly installed at the top of the side edge block; a first adapter shaft is rotatably mounted on the side block, the first adapter shaft is rotatably connected with the connecting frame, the first adapter shaft is fixedly sleeved with a modulation block, a round rod is rotatably mounted on one side of the modulation block, and a second electric motor is fixedly mounted at the top of the modulation block; the output shaft of the second electric motor and the circular rod are fixedly sleeved with circular gears. The waste gas leftover material collecting device has the advantages of reducing manpower expenditure, automatically collecting waste gas leftover materials and conveniently and rapidly cleaning the leftover materials.

The utility model relates to spot welding fixture technology field especially relates to a robot automatic spot welding fixture of turntable bottom plate subassembly, including mechanism body, be provided with lifting adjustment subassembly, positioning and pressing subassembly, lifting positioning subassembly, slide table positioning subassembly, head positioning subassembly, side edge mobile slide platform subassembly and vertical plate positioning subassembly on mechanism body. The utility model novel structure, can change type fast, can be compatible with different types of product model, realize flexible production, automatic welding, solved the problem of traditional through artificial clamping labor intensity, promoted the quality and production efficiency of product, saved work time, can accurate control workpiece's up and down, horizontal, vertical and angle positioning, adapt to different size and shape turntable seat circle and workpiece, improved welding accuracy, applicable to a variety of workpiece types and size, realized the multifunctionality and adaptability of equipment, can fasterly complete welding task, shorten production cycle, promote overall production efficiency.

This invention discloses a method and system for intelligent assessment and injury risk warning of fitness movements based on motion phase perception, belonging to the field of sports biomechanics. It includes: collecting user motion images, basic health physiological data, and musculoskeletal geometric parameters to construct an assessment dataset; identifying skeletal points, dividing the movement execution phase, and extracting the temporal sequence of key joint angles; constructing a collaborative pattern dictionary grouped by movement type and execution phase; dynamically invoking time-varying collaborative constraints using a soft gating mechanism; constructing a combined loss function by fusing inverse dynamic physical consistency terms; and achieving real-time torque prediction of multiple joints based on a spatiotemporal graph neural network. It also involves calculating joint contact forces and soft tissue stress distribution by simplifying the musculoskeletal model, constructing a cumulative injury factor and a dynamic safety threshold, and combining a contrastive learning motion quality embedding network to generate a motion correctness score and an individualized injury risk assessment value. This invention solves the problems existing in the prior art.

This invention discloses a machining process for precision screws, belonging to the field of mechanical manufacturing technology. It includes the following steps: S1, rough machining and forming: treating the surface of the bar stock and machining functional slot structures, followed by pre-deburring; S2, structural strengthening: heat-treating the workpiece for strengthening; S3, precision finishing: correcting the form and position tolerances of the heat-treated workpiece and precision grinding each surface; S4, quality assurance delivery: completing inspection, cleaning, and packaging. This process flow is clear, employing a logical arrangement of "forming first, then strengthening, and then fine-tuning," resulting in a workpiece with not only a high-hardness surface but also improved coaxiality of its stepped axis and thread trajectory accuracy. This significantly enhances the screw's operational stability at high speeds. Furthermore, through staged quality control and precision correction, it improves the first-pass yield of the workpiece and reduces the risk of scrap due to heat treatment deformation, possessing extremely high industrial application value.

The utility model relates to a shoe -pad and shoe sole convenient to dismount, including shoe -pad body and support board, the bottom of shoe -pad body is equipped with the accommodation groove, the support board is placed in the accommodation groove, the front end of above -mentioned support board is equipped with the guide slot and the round hole connected in the rear end of guide slot, the groove bottom of accommodation groove rear end is equipped with the locating post, and the one end of locating post is connected with the locating cap away from shoe -pad body, the side of above -mentioned support board rear end is equipped with the bayonet, and the groove bottom of accommodation groove rear end is equipped with the locking post of cooperation bayonet, and the lower end of this locking post is connected with the locking cap. The rectangular section design of the locating post of the application can limit the rotation of the support board around the locating post with the linear cooperation of the guide slot, further ensure the position accuracy of the support board in the accommodation groove, avoid the influence of the supporting effect due to the deviation of the support board, the user can complete the dismounting of the support board without the help of the tool, and precise positioning can be realized without repeated adjustment, the convenience and the precision are considered, and the operation is simple and convenient.

The application discloses a coal-fired unit carbon emission accounting method and system for BECCS, and a medium, and relates to the technical field of carbon emission accounting, which comprises the following steps: obtaining full-chain accounting basic data sets, including fuel basic parameters, emission factor parameters, coal-fired unit operation parameters, supply chain parameters and CCS system parameters; taking a predetermined unified power supply quantity benchmark and an accounting boundary as core benchmarks to determine the benchmark emission of the pure coal combustion benchmark line full life cycle link, the first carbon emission corresponding to the biomass replacement emission reduction link of the BECCS scenario combustion emission, the second carbon emission corresponding to the biomass supply full life cycle link, the third carbon emission corresponding to the raw coal supply chain link in the BECCS scenario, the fourth carbon emission corresponding to the power generation efficiency loss additional link, the fifth carbon emission corresponding to the CO2 capture system full link, the sixth carbon emission corresponding to the CO2 transportation and storage link, and calculating the net carbon emission of the BECCS scenario full life cycle.

The invention belongs to the field of metal-based composite materials, and relates to a micro-nano particle reinforced metal-based composite material and a preparation method thereof. Comprising the following steps: mixing micro-nano reinforced particles and salt particles in proportion, heating to melt the salt particles, and ultrasonically stirring to obtain molten salt-micro-nano turbid liquid; smelting a metal matrix to obtain a metal melt, adding the molten salt-micro-nano suspension into the metal melt, stirring to obtain a mixture melt, and preserving heat; stopping stirring, allowing the mixture melt to stand, allowing the micro-nano reinforced particles to enter the metal melt from the molten salt to form an alloy melt, and keeping the temperature until the molten salt and the alloy melt are layered; and casting the alloy melt and the molten salt together, cooling, and stripping the salt body to obtain the micro-nano particle reinforced metal matrix composite material. According to the preparation method, the metal-based composite material with uniformly dispersed micro-nano particles is obtained by optimizing the preparation process, meanwhile, the preparation difficulty and the preparation cost are reduced, and a solution with application potential is provided for industrial production of the metal-based composite material.

The invention discloses an acid-base bifunctional catalyst for preparing (methyl) acrylate through aldol condensation by an electrostatic adsorption method and application of the acid-base bifunctional catalyst. By utilizing the electrostatic interaction of hydroxyl oxygen anions and active alkali metal ions on the silicon dioxide carrier, directional regulation and control of active sites are realized, the possibility of agglomeration, migration and loss of active components is reduced, and the utilization rate of the active sites is improved. Compared with a traditional impregnation method, the loading capacity of the alkali metal active component is reduced by about 1 / 2, and the activity is improved by about 50%. The method is simple in preparation, good in repeatability and suitable for large-scale industrialization.

The invention belongs to the technical field of composite material preparation, and particularly relates to a tungsten infiltrated copper composite material and a preparation method thereof. According to the invention, through a multi-scale through pore network formed by'prefabricated material construction ', molten copper liquid can be rapidly filled along a large pore channel and fully permeates into the tail end of a small pore, so that the defect of'black core' generated by closed pores is thoroughly avoided. According to the prepared composite material, the tungsten phase and the copper phase respectively form a stable and communicated three-dimensional network, so that the unification of high conductivity (greater than or equal to 60% IACS), high strength and toughness (hardness greater than or equal to 100 HB) and excellent arc ablation resistance is fundamentally and synergistically realized, and the long-standing limitation of'impossible performance triangle 'is effectively broken through. And the process is high in integration level, green and remarkable in strengthening effect, and process simplification, environmental protection strengthening and performance improvement are achieved at one stroke. The advantages of raw materials and process cost are outstanding, the industrialization prospect is wide, and the relationship among high performance, designability and mass productivity is perfectly balanced.

The invention discloses an asphalt concrete feeding process optimization method based on an intelligent algorithm, and relates to the technical field of industrial process control. The method comprises the following steps: step 100, extracting three-dimensional dynamic characteristic data of a raw material; step 200, constructing a three-dimensional dynamic flow field model based on the three-dimensional dynamic characteristic data, realizing global prediction of the raw material flow velocity through the three-dimensional dynamic flow field model, and generating an unloading control instruction in combination with a dynamic pre-compensation logic and a drift adaptive correction logic; and the discharging control instruction is transmitted to the PLC, and a discharging execution mechanism is driven to act through the PLC. High precision, high adaptability and economical efficiency in the asphalt concrete feeding process are achieved, and the product performance stability and the industrial application value are remarkably improved.

The invention relates to the technical field of fine chemical engineering, in particular to a method for high-temperature and high-pressure catalytic synthesis of 4, 6-dichloropyrimidine by using a composite catalyst, which at least comprises the following steps: S1, mixing 4, 6-dihydroxypyrimidine, a solvent, triphenylphosphine oxide, a metal catalyst and an organic nitrogen-containing catalyst to obtain a material suspension; s2, dissolving solid triphosgene with an organic solvent to obtain a triphosgene solution; s3, dropwise adding the triphosgene solution into the material turbid liquid for reaction, and filtering, desolventizing and distilling the reacted material to obtain the 4, 6-dichloropyrimidine, so that the defects of slow reaction, low atom utilization rate and high cost of the existing triphosgene method for synthesizing the 4, 6-dichloropyrimidine are overcome, phosphorus-containing wastewater is avoided, an acid-binding agent is not needed, and the method is suitable for industrial production. And large-scale industrial popularization and application are easy to realize.

The invention discloses a deep counterfeiting detection method based on double-flow fusion and adaptive feature enhancement, and belongs to the technical field of computer vision and digital media security. According to the method, a double-flow feature extraction network is constructed, a high-low feature adaptive enhancement module (HLFAE) is adopted in a spatial flow to decompose multi-scale texture features, and micro texture expression of a forged area is enhanced in combination with expansion convolution and a channel attention mechanism; introducing a high-frequency sub-band capable of learning a discrete wavelet transform self-adaptive decomposition image into a frequency domain flow, and amplifying frequency domain artifact features through a convolutional network; a multi-modal enhanced feature attention module is designed to dynamically fuse space and frequency domain features, significant features are weighted through a multi-scale convolution kernel and a double attention mechanism, and feature interaction consistency is improved based on a cross-modal contrast enhancement (CMCE) module. According to the method, the highest AUC value of 99.63% is achieved on data sets such as FaceForce + + and Celeb-DFv2, the cross-domain generalization ability and the anti-disturbance robustness are remarkably improved, and the method is suitable for financial risk control and media content auditing.

This invention belongs to the field of catalyst technology, specifically relating to a nickel-based reverse piezoelectric catalyst, its preparation method, and its application. The catalyst uses metallic nickel as both the active component and support, with an oxide loaded on the nickel surface to form the reversed host, and a composite piezoelectric material as the synergistic phase. By total mass, nickel accounts for 50%–95%, the oxide for 1%–50%, and the piezoelectric material for 0.1%–20%. This invention involves mixing and reducing a nickel precursor with an oxide, followed by the composite piezoelectric material to obtain the catalyst. The catalyst utilizes the mechanical force of ball milling and the piezoelectric effect to synergistically catalyze the hydrogenation of carbon dioxide to methane, abandoning traditional high-temperature thermocatalysis. This catalyst can achieve highly efficient carbon dioxide conversion under mild conditions, with 100% methane selectivity and significantly improved reaction efficiency, showing promising application prospects in the field of carbon dioxide resource utilization.

The invention discloses a method for co-producing hydrogen-rich synthesis gas and a hard carbon material through biomass transient high-temperature gasification, and belongs to the technical field of biomass resource utilization and electrochemical energy storage materials. The method comprises the following steps: mixing a biomass raw material, a conductive additive and water according to a specific mass ratio, and carrying out ball milling and high-pressure molding to obtain a low-resistivity conductive blank; in a vacuum environment, through primary Joule heating, the green body is transiently heated until gasification is completed, and hydrogen-rich synthesis gas and primary porous carbon are synchronously collected; and mixing and molding the primary porous carbon and a binder, and carrying out secondary Joule heating until carbonization and hole sealing to obtain the hard carbon material. Through precise regulation and control of the two-step Joule heating process, synergistic efficient conversion of the biomass to the hydrogen-rich synthesis gas and the hard carbon material is achieved, and the method has the advantages of being high in reaction rate, high in energy efficiency, free of chemical additives, high in product value and the like and is suitable for large-scale industrial application.