48results about How to "High promotion and application value" patented technology

The invention discloses a ten-thousand-time water writing brush writing counter, which is characterized by comprising a wooden rectangular counter, wherein the two ends of a front plate and a rear plate of the wooden rectangular counter are provided with clamping grooves and sliding chutes respectively; tensioning springs are arranged in the sliding chutes; moving shafts are arranged in the sliding chutes with the tensioning springs; rotating shafts are arranged in the clamping grooves; the rotating shafts and the moving shafts are all wrapped by a high-density foam pad; and cylindrical ten-thousand-time water writing cloth is sleeved outside the high-density foam pad; when the writing counter is used, the water writing cloth is in a tensioned state all the time when brush writing is practiced; and after one face is written, the unwritten face can be quickly turned to be right above to continuously write, and the written face is quickly dried under heat dissipation effects of a ventilation fan and a kettle, so that a continuous practice effect is achieved.

The invention discloses a gob-side entry retaining method for non-blasting roof-cutting and pressure releasing of a soft-top coal seam. The gob-side entry retaining method comprises the following steps that 1, a roof of a reserved entry is reinforced on the side, close to a gob, of the reserved entry through an anchor rope, and working face advanced mining of anchor rope reinforcing construction is completed; 2, lanced seam holes are drilled in the side, close to the gob, of the reserved entry and form pre-splitting lanced seams, and working face advanced mining of lanced seam holes drilling construction is completed; 3, anchor withdrawing construction is conducted, working face advanced mining of anchor withdrawing construction is completed; 4, temporary reinforced supporting and stoppingwaste rock supporting are conducted on the reserved entry; and 5, the roof of the gob is collapsed to form a gob-side retained entry, and after the gob-side retained entry is stabilized, the temporary reinforced supporting in the step 4 is withdrawn. According to the gob-side entry retaining method, through drilling of the lanced seam holes, the link of blasting roof-cutting in original gob-sideentry retaining is substituted, and thus the gob-side entry retaining is safer; and meanwhile the usage amount of explosives is saved, the cost of gob-side entry retaining is reduced, the working environment is improved, and it is guaranteed that a gob-side entry retaining technology is safely conducted.

The invention relates to the field of medical science, and particularly relates to an anterior cruciate ligament stopping location and ligament tunnel location device combining with preoperative 3D planning information. The device comprises hardware such as a C-type arm X-ray machine, a gama correction calibration board, an image capturing card, a positioning robot, a path positioning rack, a position trailing platform, and a computer as well as software such as a 3D planning module and a 2D positioning and navigation module which are stored in the computer. The 3D planning module makes use of preoperative 3D image data of knee joints of a patient, assists a doctor in finishing personalized surgical planning, and projecting a 3D environmental message to a 2D navigation message along a specific projection direction. The 2D positioning and navigation module makes use of a 2D medical image in surgical space collected by the hardware as well as location information of various trailing objects and combines the 2D navigation message to construct a navigation environment to control the hardware such as the positioning robot and the path positioning rack to finish an accurate operation path positioning. The anterior cruciate ligament stopping location and ligament tunnel location device can assist the doctor in finishing the precise and personalized operation of anterior cruciate ligament stopping location and ligament tunnel location, thus lowering operative difficulties and enhancing operative treatment efficacy.

The invention relates to a method for treating and utilizing agricultural solid waste through aerobic high-temperature hydrolysis and fermentation, which comprises the following treatment steps: a, mixing shorn and crushed crop straws with livestock / poultry dung, squeezing the mixture to carry out liquid-solid separation, soaking the solid residue obtained in the first squeezing procedure, and further squeezing to carry out liquid-solid separation; b, mixing the liquids obtained in the two squeezing procedures in the step a, inoculating with active sludge, hydrolyzing and fermenting the mixed liquid in the presence of hot air for a fermentation period of 1-10 days, carrying out vacuum concentration, and cooling to obtain a compound microbial inoculum product; and c, hydrolyzing and fermenting the squeezed residue obtained in the step a in the presence of hot air, drying in the presence of hot air, cooling, and bagging to obtain the low-humification stable-state carbon source organic substance product. By fully using a large amount of agriculturally-produced crop straws and large-scale produced livestock / poultry dung, the method can be used for recycling multiple kinds of agricultural organic waste, thereby changing the waste into valuables, and reducing the possible secondary environment pollution.

The invention belongs to the field of graphene production and particularly relates to a method for producing graphene from sodium dodecylbenzene sulfonate. The preparation method is characterized by comprising the following steps: (1) weighing, (2) mixing, (3) stirring, (4) microwave heating, (5) cooling, (6) filtering and (7) drying, wherein expandable graphite, N-methyl pyrrolidone, sodium dodecyl benzene sulfonate and ethanol are taken as raw materials. The graphene prepared by the invention, on the one hand, has higher quality, on the other hand, and can also have higher yield, thereby contributing to realizing the large-scale and industrial production of grapheme, so that the method disclosed by the invention has broad application prospect, high practicability and application value and the advantages of low price of raw materials and simple preparation process.

The invention provides a grout-to-extinguish method of dual hard close-distance multiple seam gob areas, which resolves the problems of long grouting time, poor effect, astonishing waste of grout liquid materials and the like caused by the fact that no intensive study is performed on arrangement of grouting holes, parameter determining and the like through the existing grout-to- extinguish technology of coal mines, and simultaneously resolves the problem of difficult extinguishing of the dual hard close-distance multiple seam gob areas. The method includes the steps that confirming a specific position and range of a spontaneous ignition fire area; then calculating scattering radius of grout liquid to obtain largest separation distances of grouting drill holes and utilizing the range of the fire area and the separation distances of the drill holes to confirm the number of the drill holes in the fire area; confirming soil amount, water demand and total grout liquid amount required by the grouting through the range of the fire area and finally performing the grout-to-extinguish. The grouting is conducted from the border of the fire area to the center of the fire area in sequence. The grout-to-extinguish method of the dual hard close-distance multiple seam gob areas is simple and convenient to operate, small in risk, safe, reliable, quick in effect playing, good in effect and low in cost, and has higher actual popularization and application value.

The invention discloses an intelligent container terminal system and method based on flexible allocation of storage space. The system comprises a terminal control system, a display module, a communication module, a power supply module and a flexible storage space, the display module receives a warehouse-in and warehouse-out instruction; the sensor module carries out weighing, distance measurementand cargo bar code reading on cargos, the terminal control system carries out fusion processing on multi-sensor data information and flexibly allocates storage space according to a cargo space allocation optimization algorithm to select an optimal storage position, and finally an instruction is sent to control the three-axis execution device to achieve warehouse-in and warehouse-out of the cargos.Mixed storage of different types of goods can be achieved, the space utilization rate of the container is greatly increased through the storage mode of flexible adjustment and distribution, the goodsstoring and taking efficiency is improved, the labor cost is reduced, the vertical development space of the container can be expanded, the occupied area of the container is reduced, and high practicability and reliability are achieved.

The invention discloses a process for comprehensively mining extra-hard inter-band coal seams with a complex texture, which is characterized in that extra-hard inter-band coal seams with a complex texture are mined by using a comprehensively mechanized coal mining process; according to the inter-band situation and the coal seam distribution situation of a coal face, a coal mining machine is provided with two cylindrical powerful rotary-cut rollers of which one is used for breaking rock, and the other one is used for cutting coal; and in the process of coal cutting, two coal faces are operated alternately or a coal face is operated independently. By using the process disclosed by the invention, the comprehensively mechanized coal mining of extra-hard inter-band coal seams with a complex texture is realized, therefore, the economic and social benefits of the process are remarkable, and the popularization and application values thereof are high.

The invention belongs to the field of handicraft production and particularly provides a method for producing artificial jade from gangue. The artificial jade is characterized by being prepared from all or part of the following raw materials: gangue, quartz powder, alumina or aluminium hydroxide, zinc oxide, sodium carbonate, magnesium oxide, borax, sodium silicate, calcium oxide or calcium carbonate, titanium dioxide, potassium carbonate, talcum powder, manganese dioxide, copper oxide and iron trioxide. The method comprises the following preparation steps: (1) weighing; (2) smashing and grinding; (3) mixing and stirring; (4) smelting; and (5) carving, abrading and polishing. The artificial jade prepared by the method has delicate and tough texture, mild and soft luster and good mechanical property, can be used in such fields as jewelry, handicrafts and the like, and has broad application prospects. By producing the product with high added value from gangue used as the raw material, the invention realizes the high added value utilization of the gangue, thereby opening up a new way for the comprehensive utilization of industrial solid wastes.

The invention discloses a real-time balance device for a low-voltage power distribution network line and a working method thereof, relates to a current balance device for a medium-low voltage line and a working method thereof, and aims to fundamentally solve the problem of imbalance of three-phase current by realizing automatic real-time balance of the low-voltage power distribution network line. The real-time balance device is arranged on a low-voltage side of a transformer, and comprises a host and a plurality of slaves, wherein the host is electrically connected with the low-voltage side of the transformer through a three-phase line; each phase of the three-phase line is provided with a current transformer; the slaves are arranged between the low-voltage side of the transformer and a plurality of single-phase loads; and the slaves are connected with a plurality of single-phase loads. Through adoption of the real-time balance device and the working method thereof, three-phase current of a low-voltage power distribution network bus, current of power utilization branches and user load current under the branches can be monitored all the time; the loss of the line is reduced; the electric energy quality of a power grid is optimized; and the problem of imbalance of three-phase loads is solved fundamentally. The real-time balance device is simple in structure, and has very high economic efficiency.

The invention discloses a rubber cladding layer for cylinder and preparation method thereof, wherein the outer side of the roller core of the cylinder is covered with a rubber cladding layer; the rubber cladding layer comprises the following components based on parts by weight: 100 parts of styrene butadiene rubber, 3-5 parts of vulcanizer, 0.45-1.5 parts of accelerator, 6-10 parts of activator, 30-70 parts of reinforcing agent, 10-30 parts of plasticized softener, 3-5 parts of antiager and 20-40 parts of special compounding ingredient. The preparation method comprises preparation of rubber, processing on the roller core, shaping and vulcanizing. In comparison with the existing technology, the acid-base proof rubber cladding layer is prepared by new formula materials and can keep the original physical performance after a long time stay in the acid-base bath lotion such that the cylinder of a conveyor can be used in acid-base and chemicals environment for a long time.

The invention relates to a preparation method of a graphene anticorrosion aqueous coating for magnesium alloy, which includes steps of: preparing a graphene / methyltrimethoxysilane dispersion, coatingthe surface of AZ91D magnesium alloy with the graphene / methyltrimethoxysilane dispersion by 2-3 layers particularly in a rod-coating manner, and drying and curing the coating in a drying box at 80-100DEG C. The invention further discloses the graphene anticorrosion aqueous coating for magnesium alloy, which is prepared through the method, and the applications of the coating on a magnesium alloy product surface. In the coating, the methyltrimethoxysilane is bonded to the graphene oxide lamella, so that the composite graphene oxide coating has better anticorrosion effect. The product greatly improves the anticorrosion effect of the magnesium alloy, is low in cost, is simple in preparation method, is free of heavy metal ions and satisfies ecological and environmental protection.

The present invention discloses distant crossing method of bamboo and rice, belongs to the field of rice hybridizing technology, and aims at transferring excellent gene of heterogeneous plant to rice to expand and enrich rice gene bank, create new germplasm source and culturing new rice breed. The method includes the following steps: 1. hybridizing Raoke F4 and green bark bamboo to obtain bamboo rice; 2. obtaining the tillering seedling of the first generation of bamboo rice, treating with colchicina solution and cultivating to obtain second generation bamboo rice F2 seed; 3. hybridizing bamboo rice F2 with Baomei F3 to obtain bamboo Baomei F3; 4. hybridizing bamboo rice F2 with Haikechuan rice to obtain bamboo Kechuan F2 and hybridizing bamboo Kechuan F2 with Guichao 2 to obtain Zhuzazao rice; and 5. hybridizing bamboo Baomei F3 with Zhuzazao rice to obtain Zhudao 966 rice and Zhudao 989 rice.

The invention relates to the field of ocean engineering instruments, in particular to a vertical pipe vortex-induced vibration response testing device and a using method thereof. The vertical pipe vortex-induced vibration response testing device comprises a supporting frame, a first rotation adjusting structure, a steel wire rope, a power mechanism used for driving the steel wire rope to do reciprocating linear motion, a first guide rail arranged on the first rotation adjusting structure, a first adjusting sliding block connected to the first guide rail in a sliding mode and a first pipe connector arranged on the first adjusting sliding block. The second rotation adjusting structure is provided with a second guide rail, the second guide rail is slidably connected with a second adjusting sliding block, and the second adjusting sliding block is provided with a second pipe joint; one end of the steel wire rope is connected with the power mechanism, and the other end is connected with the first pipe joint through a sliding structure. According to the invention, factors, such as top tension, outflow velocity, series-parallel connection mode and axial distance between risers, which influence the vortex-induced vibration characteristics of the risers can be tested and studied, and the actual working condition of the deep sea risers can be comprehensively simulated.

The invention discloses a concrete panel extrusion damage repair structure and a construction method. There are vertical joints (2) on the concrete panel (1), and the feature is that rubber is installed on the middle and upper parts of the vertical joints (2). The slab (3) has a concrete panel damage zone (1.1) above the vertical joint (2), and the concrete in the concrete panel damage zone (1.1) is excavated in advance and filled with repair materials (5); A V-shaped groove (7) is reserved at the top of the seam (2), and plastic material (6) is filled in the V-shaped groove (7), and the concrete panel (1) above the vertical seam (2) An anti-seepage cover sheet (9) is arranged on the top, which overcomes the shortcomings of the dam deformation in the prior art, especially the face dam whose settlement has not been stabilized, which often occurs repeated extrusion damage, and has the ability to completely solve the problem caused by the face extrusion to the concrete face. Advantages of damage and leakage.

The invention discloses a rubber cladding layer for cylinder of a conveyor and preparation method thereof, wherein the outer side of the roller core of the cylinder of the conveyor is covered with a rubber cladding layer; the rubber cladding layer comprises the following components based on parts by weight: 100 parts of neoprene, 9-12 parts of vulcanizer, 0.3-0.5 parts of accelerator, 1-2 parts of activator, 30-70 parts of reinforcing agent, 10-20 parts of plasticized softener, 2-4 parts of antiager and 20-50 parts of special compounding ingredient. The preparation method comprises preparation of rubber, processing on the roller core, shaping and vulcanizing. In comparison with the existing technology, the acid-base proof rubber cladding layer is prepared by new formula materials and can keep the original physical performance after a long time stay in the acid-base bath lotion such that the cylinder of a conveyor can be used in acid-base and chemicals environment for a long time.

The invention provides a biological composite flocculant for waste water treatment and a preparation method thereof and belongs to the field of waste water treatment. In order to overcome the defects of an inorganic flocculant and an organic flocculant in the prior art, the biological composite flocculant is prepared from, by weight, 30-40 parts of co-fermentation broth of aspergillus sojae and red nocardia, 50-95 parts of cellulose xanthate and 3-6 parts of chitosan. The co-fermentation broth of aspergillus sojae and red nocardia is a two-stage fermented product and has a remarkable synergic effect on the aspect of flocculation after being combined with cellulose xanthate and chitosan, and the biological composite flocculant is high in flocculation activity, safe, free of toxins, free of secondary pollution and suitable for application and popularization.

The invention relates to a water surface region reconstruction method for unmanned aerial vehicle oblique photography three-dimensional model data, and the method comprises the steps: converting the unmanned aerial vehicle oblique photography three-dimensional model data into point cloud data, and carrying out the grid processing; designing a water surface region boundary extraction method by using density and elevation characteristics of water surface region point cloud data, and rapidly screening water area boundary point clouds; based on the water area boundary extraction result, constructing a triangulated irregular network model of the water surface area; intelligent selection of a water surface area texture image is realized based on EXIF information of downward-looking image data of the unmanned aerial vehicle, and an intelligent processing algorithm is designed to generate final water surface area texture image data in combination with a spatial inclusion relation between the texture image and a TIN model, so that water surface area reconstruction is realized. According to the method, an existing unmanned aerial vehicle oblique photogrammetry three-dimensional modeling technical system can be perfected, real water surface information can be rapidly and automatically reconstructed, and the method has high application and popularization value in the fields of twinborn drainage basins, twinborn cities and the like.

The invention relates to a test device for a circular triangle probability, belonging to the field of mathematical verification equipment. The device comprises a straight guide pipe, test balls, hollow pipes, a cylindrical inner cylinder with a conical top, a cylindrical outer cylinder with a conical top and a bottom plate, wherein the straight guide pipe is mounted at the top of the cylindrical outer cylinder with the conical top; the cylindrical inner cylinder with the conical top is sleeved on the inner side of the cylindrical outer cylinder with the conical top; the cylindrical inner cylinder with the conical top and the cylindrical outer cylinder with the conical top are concentric and are fixed through the bottom plate; the hollow pipes are mounted in a gap which is formed by the cylindrical inner cylinder with the conical top and the cylindrical outer cylinder with the conical top; and the three test balls are arranged. The test balls are round rubber balls and the whole deviceis made of glass or other transparent materials so that the test is convenient to observe; the bottom plate is round and is provided with a protractor with a measurement range of 360 degrees; the hollow pipes are fully distributed in the gap which is formed by the cylindrical inner cylinder with the conical top and the cylindrical outer cylinder with the conical top; and the conical top on the cylindrical inner cylinder with the conical top rightly faces to the circle center of the straight guide pipe. The device can be used for explaining and analyzing an abstract problem of circular triangle probability by means of a mould test and has the advantage of high accuracy.

The invention belongs to the technical field of artware, and in particular discloses a method of producing an artificial jade by utilizing construction waste. The method is characterized in that materials for the method are all or part of construction waste, quartz powder, aluminum oxide or aluminum hydroxide, zinc oxide, soda ash, magnesium oxide, borax, sodium silicate, calcium oxide or calcium carbonate, titanium dioxide, potassium carbonate, talcum powder, manganese dioxide, copper oxide and iron trioxide. Preparation steps are as follows: weighing, crushing and grinding, mixing and stirring, melting, carving, polishing and buffing. The artificial jade prepared according to the method disclosed by the invention is fine and tough in texture, mild and soft in gloss, has good mechanical performance, can be applied to the fields such as jewelries, artware, and the like, and has wide application prospect. The construction waste is used as the production material to produce a product with a high additional value, so that high-additional value utilization of the construction waste is realized, and therefore, a novel way is developed for comprehensive utilization of industrial solid waste.

The invention belongs to the field of artware production, and in particular relates to a method of producing artificial ink stone by using steel slag. The method is characterized in that the raw materials include all or part of steel slag, quartz powder, alumina, sodium carbonate, sodium silicate, calcium carbonate and potassium carbonate, and the preparation steps include: weighting, crushing, grinding, mixing and stirring, smelting and carving. The artificial ink stone prepared according to the invention is fine and tenacious in texture, and mild and soft in luster, has very good mechanical property, can be used in the field of artware, and has a broad application prospect. According to the invention, as the high value-added product is produced with steel slag as a raw material, high value-added utilization of the steel slag is achieved, and a new way is opened for comprehensive utilization of industrial solid waste.

The invention discloses a preserving method of fresh chili peppers. The preserving method comprises the following steps of treating raw materials, preparing marinating materials, and preserving the chili peppers. The method creatively comprises the following steps of heating oil in a stirring bowl, performing stirring, then performing mixing and stirring in the stirring bowl, and performing spreading for cooling to obtain finished products of the preserved chili peppers. A new treatment process of chili pepper main materials and the marinating materials is creatively adopted for the preservingmethod, and based on a newly researched and developed manner of performing stirring in high-temperature edible oil, the preserved chili peppers have sufficient nutrient components and favorable mouthfeel, eaters have good feedback on the preserved chili peppers, and the preserved chili peppers have high popularization and application value.

The invention provides a delicious dace head powder product and a processing process thereof. The delicious dace head powder product is prepared by taking a fresh dace head as a main raw material and supplementing with food materials such as oats, walnuts and gastrodia elata. A preparation process for the delicious dace head powder product comprises the following steps: preparing the raw material dace head, pickling the dace head, performing air-drying and dry-curing with variable-temperature air, slightly frying for removing fishy smell, crushing materials, uniformly mixing, performing vacuum packaging, externally packaging and storing. The produced delicious dace head powder is light brown in color, strong in fish flavor, and capable of being directly mixed with fluid food such as water or milk to be eaten. The dace head powder obtained by the preparation process disclosed by the invention is delicious in waste, fine in mouthfeel, good in flavor, free of fishy smell and other bad smell, free of any preservative, long in expiration date, green and safe, and the nutrient components of the dace head are sufficiently preserved, and the value of the dace head is sufficiently utilized. The preparation process disclosed by the invention is simple and reasonable, convenient to operate, low in equipment requirement and high in production efficiency, and has a very high industrial production and popularization and application value.

The invention provides a sampling pipe for detecting carbonyl compounds in electronic atomization steam of an electronic cigarette as well as a preparation method and an application of the sampling pipe. The sampling pipe comprises a pipe body with two open ends, wherein the inside of the pipe body is filled with silica-gel particles, two ends of each silica-gel particle are blocked with degreasing cotton, and derivatization reagents capable of being subjected to a derivatization reaction with carbonyl compounds are adsorbed on surfaces of the silica-gel particles. The sampling pipe is simple in structure, relatively small in size and capable of preserving the carbonyl compounds for a long time and has great practical popularization and application value. The invention further provides a preparation method of the sampling pipe for detecting the carbonyl compounds in electronic atomization steam of the electronic cigarette, the method is simple and easy to operate and suitable for large-scale production of the sampling pipe. The invention further provides an application of the sampling pipe in quantitative detection of the carbonyl compounds in the atomization steam of the electronic cigarette, the sampling process and the follow-up analysis process are simple, the analysis time is relatively short, and the sampling pipe can detect the content of the carbonyl compounds in the atomization steam of the electronic cigarette accurately.

The invention discloses a converter station valve cooling system inlet valve temperature prediction monitoring method and system, and relates to the technical field of power system detection, and the method comprises the steps: obtaining a converter valve DC load rate P, a spraying water flow Ls, a cooling water flow Lf, a cooling tower air inlet amount Q, and an environment wet bulb temperature Tw; constructing an inlet valve temperature prediction model according to the obtained physical quantity; and monitoring the cooling tower heat exchange performance of the converter valve according to the established inlet valve temperature prediction model. Specific fault reasons are judged through the spraying water flow, the cooling water flow, the cooling tower air inlet amount and the environment wet bulb temperature, an alarm is given to remind an operator, and the operation reliability of the converter station valve cooling system is improved.

The invention discloses an internal organ disease neural medicinal method based on a database, wherein a traditional Chinese medicine prescription medicine property data analysis system is involved. The traditional Chinese medicine prescription medicine property data analysis system comprises a data acquisition and database management standard and a database analysis researching content. The dataacquisition and database management standard comprises database information, database medical property determining, method screening principle, prescription treating diseases and related internal organ determining principle. According to the method of the invention, a traditional Chinese medicine prescription medical property data analysis system is firstly established; classical prescriptions andcurrent prescriptions which are universally accepted are collected; 1307 Chinese patient medicine prescriptions which are protected by the government in modern times are collected; 1003 traditional Chinese medicines are related; and an application rule of the neutral medicines are analyzed and researched by means of empirical scientific data. The analysis system is used for analyzing and researching a compatibility rule of cold and heat and neutral medical components and furthermore can analyze a prescription compatibility rule in more aspects, thereby realizing relatively high popularizationand application value.

The invention belongs to the production field of the power equipment and specifically relates to a high-carbon iron-based amorphous alloy transformer core and a manufacturing method thereof. The high-carbon iron-based amorphous alloy transformer core is characterized by being prepared from the raw materials of iron, carbon, silicon and boron by virtue of the following preparation steps: (1) weighing; (2) crushing and grinding; (3) mixing and stirring; (4) smelting; (5) melt-spinning; (6) annealing; (7) drawing and stamping; (8) stacking and fastening. The loss of the high-carbon iron-based amorphous alloy transformer core prepared by the manufacturing method in the working process is lower than that of an iron-based amorphous alloy core containing no carbon, and therefore, the waste of electric energy can be further reduced and the power supply efficiency can be improved; meanwhile, as the amount of heat generated by the core in the working process is low, an insulating material covering the core is less in ageing possibility and thus advantageous for increasing the service life of the transformer. The high-carbon iron-based amorphous alloy transformer core can be applied to the field of production of power equipment and has wide application prospect.

The invention relates to a preparation method of a white fluorescent carbon dot. The preparation method comprises the following steps: S1, preparing a precursor I; S2, preparing a precursor II; S3, preparing a precursor III; S4, preparing a carbon dot; and S5, preparing the white fluorescent carbon dot. The invention also discloses the white fluorescent carbon dot prepared by the preparation method of the white fluorescent carbon dot. The preparation method of the white fluorescent carbon dots is simple and feasible, has a high preparation efficiency and a high finished product qualified rate,and has high economic values, high social values, high ecological values and high promotion and application values; and the prepared white fluorescent carbon dot has the advantages of low toxicity, good biocompatibility, high fluorescence intensity, high storage stability and high fluorescence quantum yield, and effectively solves the technical problems that quantum dots are difficult to dope andwhite fluorescent carbon dot is difficult to prepare in the prior art.

The invention discloses a household air purification system. The system comprises a fan, an adsorption device, a high-temperature sterilization device and a fine dust removal device sequentially connected through a pipeline; an air inlet I is formed in the bottom end of the adsorption device, an air outlet I is formed in the top end of the adsorption device, the adsorption device is filled with activated carbon, and the fan is connected with the air inlet I; the high-temperature sterilization device comprises a water collector, a water heater and a sterilization box connected in sequence, an air inlet II and an air outlet II are formed in two ends of the sterilization box respectively, a spray device is arranged at the top end of the inner part of the sterilization box, the air outlet I isconnected with the air inlet II, the water heater is connected with the spray device, the air outlet II is connected with the fine dust removal device, and the bottom end of the sterilization box isconnected with a reservoir through a pipeline; an air inlet III and an air outlet III are formed in the fine dust removal device, and the air outlet II is connected with the air inlet III. According to the device, through the arrangement of an integrated process, the effects of multi-level purification and comprehensive purification are achieved, the purification function is ensured, economic benefits are improved, and the system has high practical promotion and application value.

The invention discloses a system and a method for increasing the yield of low-carbon olefins. The system comprises an extraction unit, an olefin catalytic cracking unit and an ethylene cracking device, the extraction unit is respectively connected with the olefin catalytic cracking unit and the ethylene device cracking unit; and the olefin catalytic cracking unit is connected with the ethylene device separation unit. According to the method, the byproduct C4 of all refinery plants and ethylene devices can be treated in principle, low-carbon olefins such as ethylene, propylene and butadiene with high additional values can be produced to the maximum extent from the molecular level, and the economic benefits of the devices are improved.