4971 results about "Hazardous substance" patented technology

The present invention relates to the technical field of waste gas treatment, and discloses a low carbonic acid tower for tertiary carbonic acid production, the low carbonic acid tower comprises a tower body, the inner wall of the tower body is provided with a plurality of groups of support frames, the support frames are internally provided with filler layers, the lower parts of the support frames are provided with distribution plates, and trickling ports are uniformly distributed at the bottom of a spray pipe, so that the tertiary carbonic acid production efficiency is improved, and the tertiary carbonic acid production efficiency is improved. According to the waste gas absorption tower, through the arrangement of the filter layer, dripped absorption liquid can better cover the interior of the tower body, so that waste gas and the absorption liquid can be better in countercurrent contact, when the absorption liquid flows through the arranged filler layer, the contact area of the absorption liquid and the waste gas can be increased, and an adsorption sieve in the filler layer can also adsorb some harmful substances in the waste gas; and the distribution plate is arranged below the spraying pipe, so that the absorption liquid can be secondarily distributed and is uniformly distributed in the tower body again, and the condition of non-uniform distribution of liquid drops is avoided.

The invention discloses a toxic and harmful substance leakage reinspection method, device and equipment based on an unmanned aerial vehicle, and a storage medium, relates to the technical field of Internet of Things and intelligent factories, and aims to solve the problem that the detection accuracy and efficiency of toxic and harmful substances are low. The method comprises the following steps: dividing a target area into a plurality of grids, and acquiring initial gas concentration data of each grid in real time through a fixed foundation sensing array; the grids with the initial gas concentration data larger than the preset concentration are determined as abnormal grids, and a reinspection flight path is dynamically generated according to the unmanned aerial vehicle parking position, the abnormal grid position and the environment parameters; the unmanned aerial vehicle is controlled to fly to the abnormal grid according to the reinspection flight path, and multi-dimensional data including visible light images, infrared thermal imaging data, gas component spectrums and space coordinate data of the abnormal grid are collected; and fusing the initial gas concentration data and the multi-dimensional data of the abnormal grid, constructing a three-dimensional dynamic concentration field model, and outputting leakage source position information and a diffusion trend.

The integrated intelligent self-adaptive waste gas purification system comprises a waste gas collection unit, a pretreatment unit, a washing spray tower, a dehumidification unit, an activated carbon adsorption unit and an intelligent control system which are sequentially arranged according to a waste gas treatment flow, wherein the waste gas collecting unit is used for collecting waste gas from a plurality of production units; the pretreatment unit is used for removing particulate matters and part of water in the waste gas; the washing spray tower is used for removing harmful substances in the waste gas; the dehumidification unit is used for removing water vapor in the waste gas; the activated carbon adsorption unit is used for adsorbing harmful substances and malodorous substances in the waste gas; and the intelligent control system is used for controlling the purification data parameters of all the processing units. In addition, the invention further discloses an integrated intelligent self-adaptive waste gas purification treatment method. By combining physical, chemical and adsorption technologies, a complete waste gas purification process is formed, the purification efficiency is improved, meanwhile, the operation cost of enterprises is reduced, and remarkable social and economic benefits are achieved.

The invention provides a simulation and data combined driving coal mine fire disaster dynamic disaster avoidance route planning method, and belongs to the technical field of coal disaster prevention. The technical problems that lag is caused by traditional timing updating, multiple disaster avoidance paths cannot be planned for people in different areas at the same time, and the risk that people cannot pass through a single path is caused are solved. According to the technical scheme, S1, the position of a fire source is positioned; s2, distinguishing a safe area, an affected area and a high-danger area; s3, monitoring a roadway damage condition and updating the topological graph; s4, establishing a fire hazard and toxic and harmful substance spreading prediction model; s5, predicting the change trend dynamic of each factor influencing escape; s6, outputting optimal paths of different areas; and S7, sending the optimal path. The method has the beneficial effects that a plurality of disaster avoidance paths can be planned for personnel in different areas, the passing speed and weight of each roadway are updated in real time when a disaster occurs, the disaster avoidance paths are dynamically adjusted, and the escape success rate of miners is improved.

The present invention discloses an air purifier, belonging to the technical field of ventilation devices. The air purifier comprises: a shell, an air inlet is provided at the lower end of the shell, an air inlet grid is provided on the air inlet, an air outlet is provided at the upper end of the shell, an air outlet grid is provided on the air outlet; a fan is provided in the shell; a lighting mechanism is provided at the lower end of the shell; a filter is provided in the shell; a disinfection mechanism is provided in the shell, and the disinfection mechanism is used to disinfect the air inside the shell. Dust and harmful substances will remain in the device after being purified by the air purifier. The disinfection mechanism automatically disinfects and sterilizes the internal space of the device after the air purification work is completed, which can replace the user to disassemble the device for manual disinfection. On the one hand, it reduces the user's operating burden, and on the other hand, it avoids the user from contacting with harmful substances, thereby ensuring the safety of the user.

The invention provides a garbage power generation optimization method, a storage medium and computer equipment. The garbage power generation optimization method comprises the steps of S1, garbage classification and preliminary data processing; s2, a boxing algorithm is applied, and the garbage is combined and optimized; and S3, the garbage incineration process is monitored, regulated and controlled. According to the invention, heat energy release in each incineration process can be ensured to be maximized; by introducing a heuristic method and combining a boxing algorithm, not only can garbage grouping and combustion strategies be optimized, but also dynamic adjustment can be made according to real-time monitoring data, the incineration efficiency and stability are improved, the stability of heat energy release is ensured, and then the heat energy recovery efficiency is improved; a systematic and global optimization scheme is formed, all links of garbage treatment can be considered, and the overall efficiency is improved; the method can be widely applied to waste incineration power plants, can greatly improve the heat energy utilization rate and the power generation efficiency of the incineration power plants, reduces emission of harmful substances, and improves environmental protection benefits.

The invention relates to a hazardous substance identification method fusing multi-source information collected by an unmanned aerial vehicle, and belongs to the technical field of hazardous substance detection. Optical detection data and magnetic detection data collected by the unmanned aerial vehicle for the first time are identified, invalid data are eliminated, and an optical detection position point and confidence and a magnetic detection position point and confidence are obtained; corresponding target points are obtained through matching on the basis that all distance combinations of the optical detection position points and the magnetic detection position points are smaller than a first distance threshold value, a batch of hazardous object target points are found out through a first preset threshold value, secondary detection within a narrowing range is carried out on the other target points, and the remaining hazardous object target points are found out; the problems that in the prior art, existing detection efficiency and reliability are not high, and analysis and processing of detection results are complex are solved.

The invention relates to the technical field of waste gas treatment, in particular to an organic waste gas treatment device for a circulating spraying production line, and the organic waste gas treatment device comprises a treatment tower, a grating plate, filler, a rotating shaft, a rotating driver, a stirring assembly and a spraying mechanism. For the filler with large accumulation amount, the composite motion can realize omnibearing and deep stirring of the filler, and when the organic waste gas is treated and the filler is accumulated thicker, the waste gas can fully penetrate through each layer of the filler and fully contact with the surface of the filler under the action of the material stirring roller group, so that the filler is fully stirred. The filler can perform adsorption, chemical reaction and the like on harmful substances in the waste gas by virtue of self characteristics, so that pollutants in the waste gas can be more efficiently removed, the purification effect of the organic waste gas is remarkably improved, the exhausted gas is ensured to reach a more strict environmental protection standard, and the surrounding atmospheric environment is powerfully protected.

The invention relates to the technical field of toxicology microenvironment detection, and discloses a microenvironment detection device for environmental toxicology research and a use method thereof.The microenvironment detection device comprises a detection table, the top of the detection table is fixedly connected with a microscope, the bottom of the detection table is fixedly connected with an electric telescopic rod, and the top of the detection table is slidably connected with a placement plate; when a microscope needs to be cleaned, an electric telescopic rod is started to stretch out, a liquid storage tank ascends, a lens of the microscope is soaked in cleaning liquid, meanwhile, a first connecting rod and a second connecting rod make contact with a rotating plate in the ascending process of an annular plate, the first connecting rod jacks up the rotating plate, the rotating plate extrudes the second connecting rod to descend, and a spring pushes a plate to descend; and the extrusion rod descends to extrude the cleaning liquid entering the communicating hole, and the cleaning liquid is sprayed out towards the periphery of the lens through the top of the communicating hole, so that harmful substances adhered to the surface of the lens are effectively removed, and the situation that the definition of the lens is reduced due to the harmful substances adhered to the surface of the lens is avoided.

The invention provides a high-efficiency and environment-friendly sandstone material processing control system, and relates to the technical field of sandstone material processing control, and the system comprises a production demand determination module, a blank raw material determination module, a processing workshop control module, a processing workshop fault evaluation module, an environment-friendly monitoring processing module and a sandstone aggregate online detection module. According to the invention, intelligent control of gravel production is realized, physical online detection of finished aggregate detects particle size and shape of the finished aggregate, chemical online detection of harmful substances chloride and methylene blue in the finished aggregate is realized, the detection efficiency is improved, the labor intensity of testers is reduced, and the production cost is reduced. Online collection, real-time detection, remote analysis and dynamic feedback of the finished aggregate are realized, and the quality control level of the finished aggregate is improved.

The invention relates to an ultraviolet laser focusing ionization fluid disinfection system and a disinfection machine, and the system comprises a fluid channel which is provided with a fluid inlet, a fluid outlet and a disinfection cavity, the disinfection cavity is internally provided with at least one group of optical fiber arrays, and the light emitting end of each optical fiber array is full of a cross section for fluid circulation; the output end of the ultraviolet laser emitter is connected to the input end of the optical fiber array, a focusing element is arranged at the light emitting end of each optical fiber, and ultraviolet laser is output by the optical fiber array and forms an ionization area in the disinfection cavity after passing through the focusing elements. An ultraviolet laser focusing ionization technology is adopted, an ionization focus with high energy density is formed, the ionization focus not only directly acts on fluid molecules at the focus, but also excites fluid in a peripheral area through the ionization effect, a wide ionization area is formed, harmful substances in the fluid are decomposed into harmless low-molecular compounds, and therefore the fluid concentration is improved. The efficient and thorough disinfection on the fluid is realized.

The invention relates to the field of printing and dyeing wastewater treatment equipment, in particular to printing and dyeing wastewater circulation treatment equipment with a treatment volume adjustable function, which comprises a mixing box body for supporting and a sealing cover plate fixedly arranged on the upper end surface of the mixing box body and used for sealing, and two groups of feeding guide pipes are arranged on the upper end surface of the sealing cover plate. According to the invention, the transmission clamping shaft drives the mixing blade plate to chemically treat printing and dyeing wastewater in the mixing box body, and meanwhile, the transmission clamping shaft can synchronously provide power for the wastewater treatment device and the centrifugal filtration device, so that the wastewater treatment device can carry out filter pressing and harmful substance adsorption treatment on the printing and dyeing wastewater; meanwhile, the centrifugal filtration device can perform centrifugal filtration on the wastewater, and the multi-level advanced treatment efficiency of the equipment on the wastewater can be effectively improved in a treatment mode of combining physical treatment and chemical treatment, so that the qualified rate of the equipment on the printing and dyeing wastewater treatment is improved to the greatest extent.

The invention relates to the technical field of smoke purification, in particular to an industrial smoke purification device and a purification method. The invention aims to solve the problem that the existing smoke treatment equipment has a poor treatment effect on harmful substances. According to the technical scheme, the industrial smoke purification device comprises a purification cylinder, an air inlet pipe is fixedly connected to the right side of the purification cylinder in a communicating mode, an exhaust port is formed in the top of the purification cylinder, a first liquid passing port and a second liquid passing port are formed in the left side of the purification cylinder, and the first partition plate is fixedly connected into the purification cylinder. By arranging the atomization unit, waste gas flows upwards in the gap between the flow dividing pipe and the extrusion plug through air pressure and makes contact with absorption liquid through the ventilation plate, due to the fact that the gap between the flow dividing pipe and the extrusion plug is small, the gas can flow at a high speed when the waste gas passes through the gap, and the absorption liquid is attracted to enter the flow dividing pipe through the flow guiding pipe; waste gas collides with the absorption liquid to generate fine bubbles, and the waste gas absorption efficiency of the absorption liquid is improved.

The invention discloses coating production line waste gas treatment equipment, and relates to the technical field of spraying waste gas treatment, the coating production line waste gas treatment equipment comprises a mounting table, and a mounting frame and a waste gas adsorption filtering mechanism which are fixedly connected on the mounting table, the waste gas adsorption filtering mechanism is arranged on the mounting frame, and is used for adsorbing harmful substances in waste gas; according to the coating production line waste gas treatment equipment, the driving mechanism drives the mounting pipe to rotate, the mounting pipe drives the activated carbon filtering mechanism to rotate, and meanwhile, through cooperation of the gas inlet and outlet mechanism, non-stop automatic replacement of an activated carbon plate is achieved; the waste gas treatment device has the advantages that the waste gas treatment effect is greatly improved, meanwhile, the use of a factory is also facilitated, and meanwhile, when the activated carbon plate cannot be recycled after being used for a long time, the mounting grooves in the mounting plate are matched, so that the non-stop portable replacement of the activated carbon plate is realized.

The utility model relates to the technical field of harmless treatment, in particular to harmless treatment complete equipment for animals died of illness, which comprises a supporting mechanism, a fragmentation sterilization mechanism, a transmission mechanism and a separation incineration mechanism, fragmentation operation is carried out through fragmentation stirring blades, and the mechanical fragmentation mode is time-saving, labor-saving and high in efficiency. Meanwhile, harmful substances of the animals died of diseases can be fully eliminated, and the safety of harmless treatment of the animals died of diseases is improved. A solid-liquid mixture obtained after fragmentation treatment is injected into a feeding port of the incineration treatment box from a conveying end through a pump machine of the conveying mechanism, solid-liquid separation and drying and low-oxygen combustion treatment are achieved through a solid-liquid separation bin in the incineration treatment box, smoke dust is input into a smoke dust purifier through a smoke dust discharging pipe through a smoke sucker to be treated and discharged, and the environment is protected. According to the separation and incineration mechanism, the material volume is reduced, livestock and poultry molecules are decomposed, the harmless treatment effect is achieved, and the environment-friendly and energy-saving benefits of the equipment are improved.

The utility model provides an industrial waste gas purification device which comprises a base, a purification box body, an exhaust fan and a vibration assembly, and the exhaust fan is fixed at the top of the purification box body; the vibration assembly comprises a supporting frame and a transmission shaft. The surface of the support frame is fixedly connected with the inner wall of the purification box body; the inner wall of the purification box body is fixedly connected with filter cloth and an elastic placement plate in sequence from top to bottom; the number of the supporting frames is two, through the arrangement of the vibration assembly, waste gas is filtered through the filter cloth while flowing downwards, dust in the waste gas is removed, then the waste gas makes contact with activated carbon placed on the elastic containing plate, then harmful substances in the waste gas are removed, the filter cloth can be prevented from being blocked by the dust after the filter cloth is flapped, and the dust removal effect is improved. After being flapped, the elastic placing plate drives the activated carbon to turn up and down, so that the contact area with the waste gas is increased, the waste gas purification is accelerated, and the waste gas purification efficiency is improved.

The utility model relates to a filter assembly, a tail gas treatment device and boron diffusion production equipment, the filter assembly comprises a filter element and a filter cartridge, the filter element is provided with a first end and a second end along a first direction, and the filter element is provided with a plurality of filter through holes along the first direction; the filter element is positioned in the filter cartridge; the filter cartridge is provided with an air inlet and an air outlet; the air inlet is communicated with an exhaust pipe of a vacuum furnace of the boron diffusion production equipment, and the air outlet is communicated with a tail exhaust pipe of the boron diffusion production equipment; tail gas exhausted by the exhaust pipe can enter the filtering through hole through the gas inlet and the first end in sequence, and can be exhausted to the tail exhaust pipe through the second end and the gas outlet in sequence after being filtered; a plurality of water injection blind holes extending in the first direction are formed in the filter element, and openings of the water injection blind holes are formed in the second end; a first water injection port is formed in the filter cartridge and is communicated with the opening through a water pipe; and the filter element is made of a porous material. According to the technical scheme, harmful substances such as B2O3 in the tail gas can be fully and effectively removed, and the filtering efficiency is high.

The invention belongs to the technical field of filling of an aluminum goaf under coal, and particularly relates to a bag type filling synergistic mineralization carbon dioxide sequestration method for mining a red mud-based filling material based on an aluminum strip under coal. Comprising the following steps that S1, filling bags are arranged; s2, grouting the aluminum layer bottom plate; s3, CO2 is conveyed; s4, red mud slurry is injected; s5, grouting between coal and aluminum layers; according to the method, through aluminum layer bottom plate grouting and coal aluminum interlayer grouting, Ordovician limestone water is effectively prevented from protruding out, harmful substances are effectively prevented from permeating underground water, meanwhile, a sealing cover layer for CO2 injection is also used, and the mineralization amount of CO2 is effectively increased. The main components of the red mud slurry are red mud, fly ash and crushed coal gangue, solid waste accumulation and environmental pollution are effectively reduced while the filling cost is remarkably reduced, recycling is achieved, the red mud is sealed in a flexible filling bag in a goaf, and if necessary, valuable elements in the red mud can be used for filling the goaf. And the tea leaves can also be extracted.

The utility model belongs to the field of smoke exhaust equipment in public places, in particular relates to a fire-fighting smoke exhaust filtering device for public places, and aims to solve the problems that the conventional fire-fighting smoke exhaust filtering device is generally poor in filtering effect and difficult to maintain. In order to solve the problems that in the prior art, in the prior art, a single filtering mode cannot meet the requirement, the following scheme is provided: the device comprises a filtering box, a supporting bottom plate is fixedly connected to the bottom of the filtering box, air holes for air inlet and air outlet are formed in the two sides of the filtering box, and an air outlet filtering plate and an air inlet filtering plate are fixedly embedded in the two air holes respectively; the middle position of the inner wall of the filter box is fixedly connected with a partition plate, the primary filter assembly and the refilter assembly are arranged, and the primary filter assembly is used for primarily filtering flue gas through an annular filter screen to remove large-particle impurities; and the refiltering assembly adsorbs and filters the flue gas again through activated carbon in a first sleeve and a second sleeve, so that harmful substances in the flue gas are effectively removed.

The invention discloses waste gas treatment equipment for multilayer rubber product production and a treatment process thereof, and relates to the technical field of waste gas treatment.The waste gas treatment equipment comprises a tank body, a first partition plate and a second partition plate are fixedly installed on the inner wall of the tank body, and a mixing bin, a spraying bin and a feeding bin are arranged in the tank body; according to the waste gas treatment equipment for production of the multi-layer rubber product and the treatment process of the waste gas treatment equipment, the mixing bin is arranged in the tank body, the spraying liquid is filled to the position flush with the top of the bracket, and in the deflation process of the spray head, the stirring paddle rotates and shears bubbles through the first opening, so that waste gas and the spraying liquid are in full contact and mixed; a large number of impurities in the multi-layer rubber product production waste gas can be removed, the impurities on the filter screen are guided out through the guide assembly, the phenomenon that the ventilation effect is affected due to blockage of the filter screen is avoided, residual harmful substances in the waste gas are treated through the spraying bin and the feeding bin, and the treatment effect of the multi-layer rubber product production waste gas is effectively improved.

The invention belongs to the technical field of titanium alloy processing raw materials, and discloses a process and equipment for purifying potassium fluotitanate. The purification equipment comprises primary cleaning equipment, recrystallization equipment and acid treatment equipment; the primary cleaning equipment comprises a primary cleaning tank and a first filter, a material inlet of the primary cleaning tank is connected to the K2TiF6 storage tank through a pipeline, a material outlet of the primary cleaning tank is connected to the first filter through a pipeline, a liquid phase outlet of the first filter is connected to the acid treatment equipment, and a solid phase outlet of the first filter is connected to the recrystallization equipment; the recrystallization equipment comprises a stirring heater, a second filter, a cooling crystallization tank and a third filter which are connected in sequence; the acid treatment equipment comprises an acid storage tank, a neutralization tank, a fourth filter and a distillation tower which are connected in sequence. According to the purification process and equipment disclosed by the invention, residual acid can be removed, the purity of the product is improved, harmful substances can be effectively recovered and treated, the pollution to the environment is reduced, and the economic effect of enterprises is improved.

The present invention relates generally to improved systems and methods for removing undesirable material residing in vessels. More specifically, the present invention relates to systems and methods for using at least one cannula to remove substantially en bloc, from a site of obstruction or interest, undesirable material without fragmentation and without excessive fluid loss.

The invention discloses a movable adsorption machine for waste gas treatment, and belongs to the technical field of waste gas treatment.The movable adsorption machine comprises an outer box body and brake wheels installed at the bottom of the outer box body, a gas inlet pipe is installed at the upper end of the outer box body, a filter plate is arranged below the gas inlet pipe, and a communicating pipe is arranged at the lower end of the filter plate; adsorption columns are inserted into the communicating pipes, the communicating pipes are arranged at the upper ends and the lower ends of the adsorption columns, the communicating pipes at the lower ends of the adsorption columns are connected with negative pressure generation equipment through drainage pipes, an exhaust pipe is installed at the upper end of the negative pressure generation equipment, and a power cam is arranged between the adsorption columns. According to the mobile adsorption machine for waste gas treatment, the filter plate can be cleaned in a manner of electrostatic dust adsorption and reverse blowing, the phenomenon that mesh holes in the filter plate are partially blocked by adopting a brush plate is prevented, meanwhile, harmful substances in waste gas can be adsorbed by arranging activated carbon particles, and the adsorption treatment effect on the waste gas is improved.

The invention relates to a food sampling inspection decision-making method based on a graph attention network and Crack-Topsis, and belongs to the technical field of food safety. Firstly, data are preprocessed; then, constructing a graph attention network model, inputting the preprocessed data into a GAT model for training, and predicting the number of sampling inspection times of each node by extracting node features and calculating association weights among the nodes; and finally, decision-making is carried out on the sampling inspection sequence of different hazardous substances by adopting a Crimic-Topsis method, the sampling inspection sequence of the hazardous substances is determined according to the closeness degree of the hazardous substances, and the sampling inspection efficiency and effect are improved. Through the method, a more scientific and reasonable food sampling inspection plan can be realized, the food safety is guaranteed, the decision-making efficiency of a supervision department is improved, and the waste of sampling inspection resources is reduced.

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer, a box body, a second pressure relief mechanism and a condensation part, the battery monomer is provided with a first pressure relief mechanism, the box body is provided with a containing cavity, the battery monomer is contained in the containing cavity, the box body is provided with an exhaust channel, and the exhaust channel is communicated with the containing cavity. The first pressure relief mechanism is arranged in the box body, the second pressure relief mechanism is arranged in the box body, the exhaust channel is configured to guide emissions discharged by the first pressure relief mechanism to the second pressure relief mechanism, and the condensation part is arranged in the exhaust channel and comprises condensation nucleus particles. According to the battery device provided by the invention, the content of harmful substances discharged into the environment under the condition of thermal runaway of the battery device is reduced, so that the pollution to the environment under the condition of thermal runaway of the battery device is reduced.

The utility model provides a cabin door opening mechanism for a microwave digestion instrument, which comprises a base, the base is arranged in a cabin body, two sides of the base are respectively provided with a set of connecting rod transmission mechanism, and the connecting rod transmission mechanisms are mutually symmetrical; the connecting rod transmission mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod and a first transmission shaft; the second transmission shaft is arranged on the base, and one end of the second transmission shaft is connected with the output end of the power part. The connecting rod transmission mechanism is driven by the power part so that the cabin door can be automatically opened, and the danger that harmful substances make contact with the human body when the cabin door is manually opened is avoided.

The invention relates to a method and equipment for preparing a deacidification agent from household garbage incineration fly ash, and the method comprises the following steps: primary conversion: converting various minerals in the household garbage incineration fly ash into metal carbonate minerals; secondary conversion: converting the obtained metal carbonate minerals into corresponding metal oxides to obtain a high-alkalinity deacidification agent; and optionally, performing three-stage conversion before deacidification application, and hydrating the metal oxide to obtain a deacidification agent with high activity; wherein the household garbage incineration fly ash is generated by performing deacidification treatment on household garbage incineration flue gas; the primary conversion is carried out in an aqueous solution, and a conversion reagent contains water-soluble carbonate and / or water-soluble bicarbonate; the secondary conversion is carried out at a temperature of more than 700 DEG C. According to the method, harmlessness, reduction and recycling of the household garbage incineration fly ash are achieved, environmental release and ecological burden of toxic and harmful substances are prevented, and the technical economic feasibility is good.

The invention relates to the technical field of food safety, in particular to a food safety risk assessment method for class imbalance data based on small sample learning. The method comprises the following steps: firstly, acquiring a safety limit value interval of the content of a main hazardous substance, analyzing a mapping relationship between grain and oil food safety and the main hazardous substance, proposing a SWARA-CRITIC method to calculate subjective and objective weights, and calculating a comprehensive weight of the main hazardous substance through combining the weights by a game theory; secondly, researching a grain and oil food risk assessment grade division method, and carrying out risk grade objective division through a Gaussian hybrid clustering algorithm; finally, effective feature extraction is conducted on the unbalanced data set through a prototype network algorithm based on the cosine attention mechanism, a new attention mechanism based on the cosine similarity is designed, and compared with a prototype network, the new attention mechanism replaces a traditional zoom dot product attention mechanism. The new mechanism pays more attention to samples with the same characteristics in the support set and the query set, so that a more stable and effective relation is established, and high-precision risk assessment is realized on the premise of not losing key information. The invention provides a novel food safety risk assessment technology based on a small sample learning method.

The utility model relates to the technical field of environmental quality detection, in particular to a high-precision water quality harmful substance detector based on a spectrum and mass spectrum coupling technology, which comprises a detection component, the detection component comprises a detector and a shunting component, the shunting component is arranged on one side of the detector and comprises a shunting block and two detection cavities, and the shunting block is arranged in the detection cavity. The shunting block is used for shunting water flow and discharging the water flow to the detection cavity; a detection opening of the detection cavity is communicated with the detector. When in use, the shunting assembly is arranged in the detection assembly, and a poured water source is shunted and flows in by utilizing the shunting assembly, so that the detector can be used for carrying out synchronous spectrum and mass spectrum detection on the same batch of water source samples, and the phenomenon that in step-by-step detection, after one detection is carried out, the detection time is shortened is avoided. Some substances contained in a water source sample can be influenced by a detection mechanism, so that the content of some substances in the water source sample is changed, and subsequent detection is influenced.

The invention belongs to the field of electronic wastes, and particularly relates to a waste circuit board recycling and reusing method which comprises the following steps: step 1, a preliminary decomposition stage of a waste circuit board: decomposing the waste circuit board into fragments suitable for follow-up treatment through a mechanical crushing and screening physical method; 2, a chemical leaching stage: dissolving metal components in the waste circuit board from the fragments by using a chemical solvent; 3, a metal recovery and separation stage: reducing metal ions dissolved in the solution into metal by adopting an electrolytic method; step 4, a harmful substance removal stage: removing harmful substances in the waste circuit board; 5, a resource reutilization and comprehensive utilization stage: through a recovery system unit, the recovered metal, plastic substrates and electronic component materials are extracted and utilized, and a feedback control system optimizes the resource recovery efficiency according to real-time data; and step 6, closed-loop treatment and environment-friendly compliance stage: treating wastewater, waste gas and solid waste through a closed-loop system unit.