98results about How to "Less destructive" patented technology

The invention discloses a preparation method of a coal-based yellow fluorescent carbon dot aqueous solution, which comprises the following steps: drying lignite to constant weight, grinding, sieving to obtain a primary coal sample, and weighing the primary coal sample; adding the weighed primary coal sample into a mixed solution of peracetic acid and hydrogen peroxide, stirring, and filtering to obtain a pretreated coal sample; the method comprises the following steps: mixing a coal sample with water, stirring to obtain a lignite solution, transferring the lignite solution into a cavitation device, starting a cavitation program, and adjusting and maintaining the flow; collecting circulating liquid in the cavitation device, and filtering to remove residual large particles to obtain an aqueous solution of the coal-based carbon dots; the method comprises the following steps: pretreating a coal sample by using a mixed solution of peracetic acid and hydrogen peroxide, and stripping the coal sample by combining a hydrodynamic cavitation method to prepare a carbon dot with yellow fluorescence; the method is low in cost, environmentally friendly, simple in equipment and huge in large-scale production potential, and a new method and thought are provided for enriching polychromaticity of the coal-based carbon dots.

The invention relates to the technical field of release films, and discloses a silicon-free release PET film and a preparation method thereof. The silicon-free release PET film comprises a polymer wax layer, an intermediate layer and a polymer wax layer in order from top to bottom; the intermediate layer is made of the following raw materials: PET, an inorganic modified filler, a composite additive and an antioxidant 1010; wherein the inorganic modified filler is prepared by grafting polyamide-amine onto the surface of aluminum oxide, thereby improving the mechanical properties and high temperature resistance of the film, and avoiding the film from cracking or breaking when subjected to external force; the composite additive is prepared by preparing a chloroether rubber derivative containing nitrogen and phosphorus flame retardants in the structure, thereby improving the toughness and flame retardant properties of the film, and the comprehensive play of these effects enables the silicon-free release PET film to maintain excellent performance and stability and have a long service life.

The invention discloses a gastrodia elata polypeptide extraction process, and belongs to the technical field of polypeptide extraction. According to the method, gastrodia elata cell membranes are broken through acetone pretreatment, so that protein and lipid are dissociated, trimethylsilyl ether passivates active groups, immobilized enzyme decomposes cellulose and adipose tissues through normal-temperature enzymolysis, a protein stabilizer prevents oxidation and inhibits enzyme activity, differential pressure extraction is combined with a sodium pyrophosphate buffer solution, polypeptide is promoted to be dissolved out, and activity is maintained; the high extraction rate of the gastrodia elata polypeptide and low-active group destructiveness are realized. Reaction sites and binding force are increased by epoxy groups on the surface of an immobilized enzyme carrier prepared by modifying corn starch, enzyme molecules are stable and appropriate due to good biocompatibility, enzyme molecule conformation is optimized through covalent binding, a rigid structure is enhanced, enzyme activity is kept at a high level for a long time, continuous and efficient enzymolysis is performed in gastrodia elata polypeptide extraction, and the gastrodia elata polypeptide extraction efficiency is improved. Compared with the traditional free enzyme, the gastrodia elata polypeptide enzyme has the advantages that the enzyme use cost is reduced, the enzyme consumption and waste generation are reduced, and an efficient and economical scheme is provided for gastrodia elata polypeptide extraction.

The invention discloses bacillus amyloliquefaciens with the characteristic of inhibiting mould growth and application of the bacillus amyloliquefaciens, and belongs to the field of microorganisms and fermentation engineering, the bacillus amyloliquefaciens is preserved in China General Microbiological Culture Collection Center on August 5, 2024, and the preservation number is CGMCC No.31538. The strain is bacillus amyloliquefaciens obtained by screening, separating and purifying from peasant pickles, and the strain can inhibit the growth of escherichia coli, clostridium perfringens and mould. The bacillus amyloliquefaciens disclosed by the invention solves the problem of insufficient effect of a microorganism mildew-proof method of the existing fermented feed, and the bacillus amyloliquefaciens is added into the biological fermented feed, so that the quantity of harmful microorganisms in the biological fermented feed can be effectively reduced, the generation of mycotoxin is inhibited, the feed is prevented from mildewing and going bad, and the shelf life of the feed is prolonged.

The invention discloses a preparation method of a lactoferrin-polyphenol nano compound with an intestinal immune function. The method comprises the following steps: firstly, moderately hydrolyzing lactoferrin under the action of compound protease, and optimizing a protein molecular structure; then, compounding with water-soluble polyphenol (such as chlorogenic acid or epicatechin) by utilizing a metal ion chelating technology, and inducing lactoferrin to be bridged and aggregated by Ca to form a compound; and then, carrying out ultrasonic homogenization treatment, and further controlling the particle size to enable the particle size to be distributed in a range of 100-300 nm. The obtained compound is subjected to nanofiltration concentration and electrostatic spray drying to obtain a shell-core nano compound with a stable structure, and nitrogen-filled packaging is adopted to prevent oxidation. The lactoferrin-polyphenol nano-composite prepared by the invention not only has good stability and intestinal immunity enhancement effect, but also has remarkable antibacterial activity, and can be widely applied to functional foods and nutritional health-care products.

The invention relates to a fixing device for bridge group anchors and a construction method, the fixing device for bridge group anchors comprises a plurality of steel strands and anchor bearing plates, and further comprises a mounting frame, the mounting frame comprises a back plate and a plurality of partition plates, the partition plates are fixedly mounted on the back face of the back plate, the partition plates divide the back plate into a plurality of compartments, and round holes are formed in the portions, in the middles of the compartments, of the back plate; and the anchor boxes are fixedly installed in the compartments, and installation parts of the anchor boxes penetrate through the round holes, are located on the front face of the back plate and are suitable for steel strands to penetrate through. According to the fixing device, an installation pipe is fixedly installed on a fixing plate, a steel strand penetrates through the installation pipe, and a pipeline installation hole is formed in an installation part of an anchor box and used for installing the installation pipe in a penetrating mode; the angle of the anchor box is adjusted and fixed when the anchor box is mounted, then the mounting pipe and the steel strand are positioned and fixed, the influence on the mounting angle of the steel strand in the subsequent construction process is avoided, the incident angle of the steel strand can be accurately controlled, and firmness and reliability are achieved.

The invention provides a carburized ethylene cracking furnace tube residual life prediction method based on small punched hole outer surface sampling. The method comprises the following steps: sampling the outer surface of an in-service ethylene cracking furnace tube by using a small punched hole sampling machine; performing a small-punching high-temperature creep test on the sample; carrying out equivalent stress conversion based on a creep test result; establishing an outer surface residual life prediction equation; calculating furnace tube stress and substituting the furnace tube stress into the prediction equation to obtain outer surface residual life; performing carburization-creep finite element simulation on the furnace tube of the ethylene cracking furnace; obtaining a furnace tube damage distribution condition of a finite element test result; and the overall residual life prediction is completed through the outer surface residual life and the damage distribution relationship. According to the method, furnace tube interruption or production halt is avoided, time and cost are saved, residual life prediction is carried out based on actual sampling and finite element data analysis, and the method has high reliability and accuracy and is used for early warning and maintenance decision making in advance, prolonging the service life of equipment and avoiding resource waste and accidents.

The invention discloses a gold mine exploration method and system, and relates to the technical field of prospecting exploration, and the method comprises the steps: carrying out the comprehensive research of a research region, and obtaining a prospecting target region; large-scale soil measurement is carried out on the prospecting target area, geochemical anomalies are identified, and the prospecting range is narrowed to determine the positions of the anomalies; constructing an exploring groove at the abnormal position by utilizing a groove exploring project to reveal a surface covering layer so as to find out occurrence and distribution characteristics of the underground ore body; when the occurrence and distribution characteristics of the underground ore body are not found out in the groove exploration construction, the occurrence and distribution characteristics of the underground ore body are found out by adopting a geophysical prospecting accurate measurement profile; and exposing the found underground ore body at the abnormal position through drilling engineering. According to the method, the adverse effect on the ecological environment can be minimized, and green development of geological exploration is promoted.

The invention provides a green and environment-friendly flame-retardant cellulose material and a preparation method thereof. The green and environment-friendly flame-retardant cellulose material is prepared from the following components in parts by weight: 20 to 40 parts of bio-based cellulose, 60 to 90 parts of phosphate, 30 to 90 parts of urea, 5 to 10 parts of amino silicon oil microemulsion and 90 to 150 parts of melamine. The flame-retardant cellulose material prepared by the invention has excellent flame retardance, realizes waste utilization and environment-friendly production at the same time, adopts cellulose with a wide source, is low in cost, and meets the requirements of sustainable development; the flame retardant property of the cellulose is remarkably improved through synergistic modification. High-temperature and high-pressure conditions are provided through the hydrothermal reaction kettle, uniform combination of phosphate and cellulose molecules is promoted, the modification efficiency is improved, and excessive damage of high temperature to the cellulose molecular structure is avoided. Meanwhile, through the auxiliary effect of urea, the temperature required by the phosphorylation reaction is reduced, and the integrity of cellulose molecules is protected; the reaction activity of hydroxyl is improved, and the modification uniformity is promoted; the compatibility of the material and thermoplastic resin is improved.

The invention belongs to the technical field of medical equipment, and particularly relates to a skin grafting packaging stitching instrument in surgical operation, which comprises a fresh skin grafting fixing sheet, a transplantation receiving area positioning sheet and a stitching belt, a first connecting piece is arranged at the upper part of the fresh skin grafting fixing sheet, and the fresh skin grafting fixing sheet covers and fixes fresh skin grafting; a first connecting piece is arranged at the upper part of the transplantation recipient area positioning piece, a second connecting piece is arranged at the upper part of the transplantation recipient area positioning piece, the transplantation recipient area positioning piece is positioned near a recipient area, and the sewing belt is used for sewing and fixing the fresh grafted skin near the recipient area through the first connecting piece and the second connecting piece. The method is simple and rapid to operate, short in operation time, small in bleeding amount, small in wound and destructive effect on fresh skin grafting and recipient tissue, low in infection rate, safe and sanitary, and the skin is easy to survive.

The invention relates to an in-situ microcell iron and manganese oxide Sr isotope dating method. The in-situ microcell iron and manganese oxide Sr isotope dating method comprises the following steps: cutting iron and manganese oxide to be detected to obtain an optical sheet sample; the method comprises the following steps: performing point denudation on an optical sheet sample, loading denudated aerosol into an MC-ICP-MS plasma source by using carrier gas for ionization, and collecting ion signal intensity data including 82Kr < + >, 84Sr < + >, 86Sr < + >, 87Sr < + >, 88Sr < + >, 85Rb < + >, 87Rb < + >, 167Er < 2 + >, 170Er < 2 + > and 173Yb < 2 + >; processing the obtained ion signal intensity data to obtain a corresponding isotope ratio, and comparing the isotope ratio with an ocean Sr isotope evolution curve to obtain the formation time of the to-be-detected iron and manganese oxide. The method solves the problems of low spatial resolution, low accuracy and complicated operation of the existing iron and manganese oxide dating method.

The present invention discloses a sampling device for detecting the compaction of roadbed used in highway engineering, which relates to the field of roadbed sampling, and comprises a bearing box, one end of which is fixedly mounted with a hollow pipe, one side of which is rotatably mounted with a lifting assembly, part of which is arranged inside the bearing box, and the other part of which is arranged inside the hollow pipe. In the sampling process of the present invention, the presence of the lifting assembly ensures that the device can adapt to the roadbed of a highway with a high soil density, and the presence of the hollow pipe and the movable rod ensures that the sampling assembly built into the movable rod will only move on a vertical line, avoiding the problem of tilted moving route, ensuring the accuracy of soil sampling data, and at the same time, the overall use of a drill bit to break the soil reduces the destructiveness to the soil, thereby ensuring that the detection result is closer to the actual data and improving the reliability of the final result.

The present invention relates to an electrochemical sensor, a graphite foil electrode for monitoring carbendazim and a preparation method thereof, wherein the graphite foil electrode for monitoring carbendazim comprises: a graphite foil substrate and graphene nanosheets vertically and uprightly distributed on the surface of the graphite foil substrate, wherein the graphene nanosheets and the graphite foil substrate are seamlessly connected; the graphene nanosheets and the graphite foil substrate are prepared by electrochemical stripping of a piece of graphite foil; the oxygen content in the graphite foil electrode is 15%-25%; and the nitrogen content is 3%-10%. The beneficial effect is that the graphite foil electrode, as a self-supporting electrode, can be directly used as a working electrode of an electrochemical sensor. The cost of the raw material graphite foil is low, the preparation method of the graphite foil electrode is simple, the electrode has high reusability, and has good application prospects.

The invention relates to the technical field of high polymer materials, and discloses a functional plastic based on a high polymer material and a preparation process thereof, the functional plastic comprises the following raw materials: polypropylene, a flame retardant additive, a smoke suppression functional component, a filler, a stabilizer, an antioxidant and a lubricant; wherein the flame-retardant additive is xylan of which the structure contains a nitrogen-phosphorus flame retardant; the smoke suppression functional component is prepared by complexing iron ions on the surface of kaolin, and the functional plastic prepared by the invention has good flame retardant property and smoke suppression property, and can significantly reduce the spreading speed of flame and reduce the generation of toxic smoke when a fire occurs, thereby reducing the destructiveness of the fire and the risk of casualties, and having good application prospects. The applicability and the safety of the plastic under various environmental conditions are ensured, and the application field of the plastic is widened.

The invention relates to the field of fire simulation and prediction, and provides a simulation and prediction method for an extreme explosion fire behavior, which comprises the following steps of: determining data of a flame wall attachment behavior through a flame airflow pressure difference value obtained by an experiment; and judging whether the flame meets the critical occurrence condition of the explosion fire behavior at the arc-shaped curved surface position corresponding to the detection device or not, and taking the arc-shaped curved surface position corresponding to the detection device as the critical occurrence position of the explosion fire behavior when the flame meets the critical occurrence condition of the explosion fire behavior at the arc-shaped curved surface position corresponding to the detection device. According to the method, the critical occurrence condition of the explosion fire behavior is judged on the basis of the flame wall attachment behavior data, and the explosion fire behavior can be quantitatively represented. After the flame airflow pressure difference value is obtained, the flame airflow pressure difference value is verified, the accuracy of the measured parameters can be improved, subsequent data processing and analysis are facilitated, and effective support is provided for research of explosion fire behaviors.

The application discloses a multi-element time series data privacy protection method based on deep reinforcement learning driving and belongs to the technical field of data privacy protection. The method comprises the following steps: performing dynamic state perception coding processing on multi-element time series data output by a target data source to generate a state representation tensor carrying initial privacy semantics; inputting the state representation tensor into a differential privacy noise injection unit driven by a deep reinforcement learning intelligent agent to output an adaptive noise disturbance signal suitable for the current state representation tensor; superimposing the adaptive noise disturbance signal on the state representation tensor to generate a privacy protection type state representation tensor after noise confusion; inputting the privacy protection type state representation tensor into a multi-layer time series state machine driving unit to extract time series evolution features in the privacy protection type state representation tensor; and performing safe aggregation processing on a plurality of local privacy protection type state representation tensors through a federal aggregation mechanism according to the time series evolution features to generate a global privacy protection state representation tensor.

The invention discloses a security event data management system based on intelligent grading, which relates to the technical field of security event data intelligent management and comprises a network flow collector, a log collector, a data preprocessing unit, a security event pre-grading unit, a pre-grading broadcast alarm unit, an intelligent grading unit and a central server. The data preprocessing unit analyzes network flow data and system log data, destructive event feature data need to be immediately transmitted to the security event pre-grading unit, grading is achieved without complex model calculation, and only the destructive event feature data need to be matched in the ergodic destructive security event feature database, so that the destructive event feature data can be graded. If the preset matching standard is met, the result of judging the occurrence of the security event is interacted with the preset-level broadcast alarm unit, and the preset-level broadcast alarm unit performs network broadcast alarm and sound-light alarm, so that the rapid preset level of the security event is realized, the network broadcast alarm and the sound-light alarm are simultaneously performed, and the destructiveness of the security event is reduced.

The present invention belongs to the field of environmental protection, and in particular, relates to a wet flue gas desulfurization system and a wet flue gas desulfurization method. The desulfurization system provided by the present invention includes: a limestone pulping tank, a limestone-gypsum flue gas desulfurization tower, a gypsum slurry separation device, a gypsum dehydration device, a recovery pool, a wastewater separation device, a chemical precipitation device, an advanced oxidation reactor and an external drainage pipeline. The system provided by the present invention can control the LAS concentration in the desulfurization tower at a low level by adding an advanced oxidation reactor and returning the desulfurization wastewater from which LAS is removed by advanced oxidation to the desulfurization tower, thereby eliminating the root cause of the foaming of the desulfurization tower, and then the desulfurization system can operate normally under high chloride ion concentration conditions, that is, realize the high concentration ratio operation of the desulfurization system, and significantly reduce the discharge of desulfurization wastewater. In addition, the COD value of the discharged wastewater of the system is low, which has good environmental benefits.

According to the surface modification method of the sodium-ion battery positive electrode material and the sodium-ion battery positive electrode material provided by the invention, after the positive electrode material is prepared by sintering through a coprecipitation reaction, the sodium-ion battery positive electrode material is subjected to surface modification by using chlorosulfonic acid and liquid nitrogen, so that residual alkali on the surface of the material is eliminated, and moderate surface defects are introduced; active sites are increased, and the electrochemical characteristics of the electrode material are improved. The modified sodium ion battery positive electrode material obtained by the invention has more excellent charge-discharge efficiency and cycling stability, and the method has the advantages of simple process and low cost, and can meet the requirements of large-scale production.

The utility model relates to the technical field of vegetation pruning, in particular to a road area side slope greening tree and shrub vegetation pruning device which comprises a base and a pruning device body, a rectangular block is installed at the other end of the base, a rectangular groove is formed in the side, away from the base, in the rectangular block, and a first screw rod is rotatably installed in the rectangular groove; the top end of the first screw rod penetrates through the top end of the rectangular groove to be provided with a first motor, a first sliding block is installed on the first screw rod in a threaded mode, a fixing frame is installed on the side, away from the rectangular groove, of the first sliding block, and a second screw rod is rotatably installed in the fixing frame; a second screw rod drives a second sliding block to linearly move in a fixing frame in the rotating process, so that the second sliding block drives a connecting rod to stretch out and draw back in the fixing frame, the length of the connecting rod can be adjusted, arbor and shrub vegetation at different distances can be trimmed, and the angle of a trimming device body can be adjusted through a rotating device; and arbor and shrub vegetation at different angles can be conveniently adapted.

The utility model discloses a hoop type truss base riding frame hanging basket suspension device, which relates to the technical field of building construction, and adopts the technical scheme that the hoop type truss base riding frame hanging basket suspension device comprises a truss base, the truss base comprises two groups of supports which are arranged in parallel, the two groups of supports are fixedly connected through a plurality of connecting rods, each group of supports comprises two support legs which are vertically arranged, the lower ends of the two supporting legs are fixedly connected through a horizontal base, and the base is fixed to an upper-layer flower stand beam through a U-shaped hoop. Guide sleeves are inserted into the upper ends of the two supporting legs and comprise horizontally-arranged guide rods, a main cross beam is inserted into the guide rods, an auxiliary cross beam is inserted into one end of the main cross beam and extends to the inner side of a building, and the end, away from the guide sleeves, of the main cross beam is connected with a hanging basket through a pull rope. The fixing device has the advantages of being safe in structure, firm in fixing, convenient to operate, small in damage to the non-transformation part of an original project, capable of reducing project cost and capable of guaranteeing the construction period.

The invention relates to the technical field of vegetable planting, in particular to soil loosening and weeding equipment for vegetable planting, which comprises a frame and further comprises mounting seats, a lifting assembly, a deformation assembly and a rake tooth weeding assembly, soil loosening teeth and rake teeth are mounted at the bottom ends of the two mounting seats respectively, and each mounting seat comprises a fixed seat and two movable seats. The two movable seats are hinged to the two ends of the fixed seat, synchronous lifting of the two mounting seats is achieved through the lifting assembly, and the deformation assembly is used for achieving synchronous upward or downward deflection of the two movable seats; the soil loosening and weeding structure can be deformed to be matched with the inclined planes of the ridging parts for a vegetable planting field with alternately distributed ditch parts and ridging parts, so that operation can be smoothly carried out on different terrains, the situation that effective operation cannot be carried out due to unmatched terrains is avoided, and the adaptability of equipment to complex terrains is greatly improved.

The utility model discloses a battery pack. The battery pack comprises a box body with an accommodating cavity and a cover body which covers the box body along a first direction to seal the accommodating cavity, the circuit board assembly, the isolation piece and the battery cell are sequentially arranged in the containing cavity in the first direction. The accommodating cavity is divided into a first chamber and a second chamber which are sealed with each other by the separator; the circuit board assembly is located in the first cavity, the battery cell comprises a main body and a tab which are connected, the main body is located in the second cavity, and the tab penetrates through the separator and is connected with the circuit board assembly. When the main body is subjected to thermal runaway, sprayed corrosive gas, electrolyte and other impurities are blocked by the separator and only move in the second chamber or break through an air leakage structure of the battery pack, so that the gas, the electrolyte and the like are prevented from rushing into the first chamber; therefore, damage such as gas impact or electrolyte corrosion to the circuit board assembly is avoided, destructiveness during thermal runaway is reduced, and safety is improved.

The present invention relates to the field of fire simulation prediction, and provides a simulation prediction method for extreme explosive fire behavior. The data of flame wall attachment behavior is determined by the flame airflow pressure difference value obtained by experiment, and then based on the flame wall attachment behavior data, it is judged whether the flame meets the critical occurrence condition of explosive fire behavior at the arc surface position corresponding to the detection device. When the critical condition of explosive fire is met at the arc surface position corresponding to the detection device, the arc surface position corresponding to the detection device is used as the critical occurrence position of explosive fire behavior. The present application is based on the flame wall attachment behavior data to judge the critical occurrence condition of explosive fire behavior, and can quantitatively characterize the explosive fire behavior. After obtaining the flame airflow pressure difference value, verifying it can improve the accuracy of the measured parameters, facilitate subsequent data processing and analysis, and provide effective support for the study of explosive fire behavior.

The utility model discloses a power supply and signal connector male end, which comprises an insulating seat, a power supply terminal and a signal module, the insulating seat comprises a bearing end and a plug-in end, the two sides of the plug-in end are provided with positioning U-shaped grooves communicated with a plug-in groove, the width of the opening end of each U-shaped groove is larger than the width of the U-shaped bottom of the U-shaped groove, and the plug-in end of each U-shaped groove is provided with a plug-in groove. And positioning blind holes communicated with the U-shaped groove and the opposite insertion grooves are formed in the opposite insertion grooves. The signal module is produced in an integral injection molding mode, so that the possibility of poor stability of the signal terminal caused by large insertion force is avoided. When matching and matching are carried out, the arrangement of the U-shaped groove ensures that a matching female end can be accurately matched and inserted with the connector provided by the utility model. The insertion groove is provided with a positioning blind hole communicated with the U-shaped groove and the insertion groove, the accuracy of the insertion depth direction of a matched insertion female end and the connector is ensured, the cross section of the positioning blind hole is set to be a large semicircular ring, the attaching area of the matched insertion female end and the connector in the matching process is increased, and the stability of the matched insertion is ensured.

The utility model discloses a leveling mechanism for semiconductor packaging in the technical field of leveling devices, which comprises a base, first support blocks are fixedly connected between two sides of the base far away from each other, the tops of the plurality of first support blocks are fixedly connected with adjusting mechanisms, a first motor is arranged on one side of the middle of one side of the base far away from the first support blocks, and a second motor is arranged on the other side of the base far away from the first support blocks. A bearing disc is fixedly connected to the middle of the top of the base, and a machined product is arranged in the middle of the top of the bearing disc. The leveling mechanism for semiconductor packaging has the remarkable characteristics of high fixity during processing, small error, high device stability and the like.

The present invention discloses a dry adhesion grasping and releasing device applied to the claw foot of a wall-climbing robot. A plurality of dry adhesion grasping and releasing devices are arranged on the claw foot of the wall-climbing robot to realize crawling by alternate grasping and releasing. The device comprises a top frame, a bottom frame, an intermediate frame, an adhesion subunit, a release subunit and a linear actuation subunit. The top frame, the intermediate frame and the bottom frame are arranged in parallel and spaced from top to bottom. The top frame and the intermediate frame are planar structures. Two fixed pulleys are arranged on the top surface of the top frame. A pair of support frames are arranged on the bottom surface of the bottom frame. When the foot of the wall-climbing robot is released from the wall, the support frames still contact the wall to provide support. The present invention is different from the grasping and releasing method of the traditional dry adhesion system. The grasping and releasing of the dry adhesion system is controlled by a three-layer frame structure and a linear actuation device, and has good controllability and applicability.

The present application relates to a kind of methods for preparing fluorescent nitrogen-rich carbon quantum dots from coal in aqueous system based on photocatalytic technology, belonging to the technical field of nanomaterial preparation.The method includes pretreatment of coal, ammonia oxidation reaction of coal and ammonia water to obtain nitrogen-rich soluble, the nitrogen-rich soluble is subjected to photocatalytic reaction again, and finally, carbon quantum dot solid powder is prepared by centrifugation, filtration, dialysis and drying treatment.The present application realizes the preparation of fluorescent nitrogen-rich carbon quantum dots from low-rank coal in aqueous system by using ammonia oxidation and photocatalytic technology, and the reaction conditions are mild and green and non-toxic, without harsh reaction conditions such as high temperature / high pressure, strong acid / strong base environment, organic solvent or special equipment.

The invention relates to the field of thermal instrument auxiliary equipment, and discloses an alarm device for thermal control of a thermal power plant, which comprises a bottom frame, a cover, a vent pipe I, a vent pipe II, a brush area I, an air hole I, an air hole II, an air hole III, an air pump, a brush area II, a poke rod, a blocking plate, a control module, a micro differential pressure sensor and an alarm lamp. Dust on the cover can be cleaned regularly, and the dust is prevented from blocking an instrument and light rays of a warning lamp of the device; according to the invention, the instrument protected in the cover can more accurately sense various environmental parameters in the external environment, and dust can be discharged out of the cover, so that the destructiveness of the external environment to the instrument is reduced; besides, the device can block the first breather pipe and detect the sealing performance in the cover, when the sealing performance exceeds a preset range, the device can give an alarm to prompt replacement or maintenance of the device, and normal operation of the instrument is not affected.