36results about How to "Make up for stability" patented technology

The invention provides a coordination control method for vehicle path tracking and stability. The method includes the following steps: step S1. performing vehicle modeling; step S2. performing estimation on a vehicle state and system interference based on Kalman filtering; and step S3. performing integrated control on the vehicle path tracking and stability. The method establishes a vehicle dynamics model and a path tracking model, and designs an estimation method of the vehicle state and steering system interference. An upper-layer controller is designed by using a sliding mode control method, which aims to ensure the stability of a vehicle itself while reducing course deviation and lateral deviation during a path tracking process. In a lower-layer controller, a method for optimal distribution of a wheel tire force is designed, and according to requirements of the upper-layer controller and combining yaw and roll stability conditions of the vehicle, directional control distribution ofthe wheel tire force is achieved. The coordination control method can ensure that a wheel independently drives the smart automobile to achieve a path tracking effect, and also ensures lateral and roll stability of the smart automobile itself.

The invention discloses an auto-uncovering robot in a modular design structure. The auto-uncovering robot comprises a lifting mechanism, a rotating mechanism, a barrel center positioning mechanism, a shifting mechanism, a cover storage mechanism, a cover picking mechanism, a support and a tightening shaft mechanism. Through the reasonable structure and coordination of the mechanisms, functions of automatically uncovering multiple target barrels and picking and storing the covers are achieved; the flexibility, safety, precision and stability problems of existing equipment are made up.

The invention discloses a vehicle-mounted integrated information system based on a 3G/WIFI wireless network. The vehicle-mounted integrated information system based on the 3G/WIFI wireless network comprises an intelligent tablet computer device and a vehicular audio host device. The intelligent tablet computer device and the vehicular audio host device are connected together through a connector. A communication protocol is set between the intelligent tablet computer device and the vehicular audio host device and used for calling the connector to conduct interaction on information of the intelligent tablet computer device and information of the vehicular audio host device. The intelligent tablet computer device comprises a tablet computer master chip control module which is used for computing various kinds of data of the vehicular audio host device and sending a control instruction to a vehicular audio host system. The vehicle-mounted integrated information system based on the 3G/WIFI wireless network can achieve the functions of cloud function upgrading and remote center management, make on-vehicle life and off-vehicle life of people closely connected together and achieve intelligent extension, so that user experience is improved continuously, and the use frequency and practical value of the vehicle-mounted integrated information system are fully increased.

The invention discloses an intelligent lamp capable of automatically detecting falling down of elders living alone and especially relates to the FPGA-based video falling down detection technology. The intelligent lamp comprises an LED lamp module, an intelligent falling down module and a power supply module. The LED lamp module is a conventional illuminating lamp. The intelligent falling down detection module comprises a CMOS camera circuit unit, an FPGA control circuit unit, a buzzer warning circuit unit and a GSM communication circuit unit. The CMOS camera circuit unit acquires a video image and inputs the video image to the FPGA control circuit unit. The FPGA control circuit unit analyzes the video image, carries out falling down determination, if the determination result is the falling down, controls the buzzer warning circuit unit and the LED lamp module to carry out sound and light warning so as to help rescuing persons to quickly position a room where the elder falls down. The GSM communication circuit unit sends the falling down warning information to a community service station and relatives of the elder living alone, so the elder can be timely rescued when falling down and occurrence of serious consequences is avoided. According to the invention, by combining the LED lamp and the FPGA-based video falling down detection technology, on one hand, the intelligent lamp can be used as the household illuminating lamp without additional detection devices for the family and on the other hand, disadvantages of poor stability and poor timeliness of the traditional PC-end video falling down detection system are overcome; the false alarm rate is low; and the device is small in size and convenient to install.

The invention discloses a preparation method of a tourmalinite fuel oil activator. The tourmalinite fuel oil activator comprises tourmalinite nano-powder as a main functional component. The preparation method comprises the following steps of compounding the tourmalinite nano-powder and spinel ferrite, mixing the compound and an additive according to a mass ratio of the tourmalinite nano-powder, the spinel ferrite to the additive of 87-93: 5-9: 2-4, carrying out sintering to obtain a solid mixture, and adding water and a surfactant into the mixture, wherein the amount of the used mixture is 1-5% the total amount of the solid-liquid mixture, a water use ratio is in a range of 5-98% and a surfactant use ratio is in a range of 2-30%. The tourmalinite fuel oil activator obtained by the preparation method can improve fuel oil quality, promote full combustion of fuel oil, improve combustion efficiency, save fuel oil, improve fuel oil atomization quality, and realize full combustion of fuel oil thereby reducing discharge of harmful gas so that energy saving and emission reduction are realized.

The invention discloses a glass microballoon manufacturing device comprising a furnace body (1) and a waste gas treatment device, wherein the furnace body (1) is formed by air-tight connection of an upper part and a lower part, the upper part of the furnace body is of a cubic shape, a waste gas emission port (4) is arranged at the top of the upper part, one or more injection-type burners (2) are horizontally installed on the side of the upper part, a preheating air pipe (14) is arranged in the upper part, the lower part of the furnace body is of a square conical shape, and one or more microballoon collectors (3) are arranged at the bottom of the lower part. According to the glass microballoon manufacturing device and the preparation method thereof provided by the invention, the furnace body which adopts the cubic structure enlarges the cooling space; the horizontally installed injection-type burners and the preheating air pipe arranged in the furnace body can give full play to the heat value of fuel, thus reducing energy source waste, saving energy and reducing emission; TiO2 and Al2O3 with relatively lower costs are adopted, the refractive index of the product is greater than or equal to 1.93; and the glass microballoon manufacturing device and the preparation method thereof have the advantages of reducing devitrification, improving the cooling velocity, having good product quality, improving the utilization ratio of raw material, being capable of large-scale production, and the like.

The invention relates to a gas-magnetic hybrid bearing for gyro motor use. The bearing comprises a shaft sleeve, a shaft, thrust plates, inner magnet rings, outer magnet rings and nuts. The shaft piercing through the shaft sleeve is coaxial installed inside the shaft sleeve, and two ends of the shaft are coaxially provided with thrust plates that are fastened by nuts. Tiny gaps are kept between the shaft and the shaft sleeve as well as between the thrust plates. A group of outer magnet rings are coaxially arranged on the inner surface of the shaft sleeve, and a group of inner magnet rings corresponding to the outer magnet rings in positions are coaxially mounted on the outer surface of the shaft. And the inner round faces of the outer magnet rings and the outer round faces of the inner magnet rings are of the same polarity, so that the function of a permanent magnetic bearing can be realized. The gas-magnetic hybrid bearing for gyro motor use in the invention has simple structure, scientific design, safety and reliability, and strong practicality. The bearing provided in the invention integrates the advantages of aerodynamic bearings and permanent magnetic bearings, overcomes the friction and wear problems during motor starting and stop in aerodynamic bearings, and also solves the problems of poor system stability and small rigidity in permanent magnetic bearings.

The invention provides a 3D printing composite material which comprises the following components in percentage by mass: 50-80% of TPU, 20-50% of polyolefin and 0.1-5% of a compatilizer. The 3D printing composite material is applicable to 3D printing consumables and is easy to process and smooth in printing, and a printed product is excellent in mechanical property, stable in size and high in surface gloss degree. The invention further provides a method for preparing the 3D printing composite material and application of the 3D printing composite material.

The invention discloses cotton-feeling knitted fabric. The fabric is a warp knitted fabric formed by the coil of a cotton-feeling polyester filament yarn, the height of the coil is 0.10-1.50 mm, the width of the coil is 0.10-2.00 mm, and the variation coefficients of the height and the width are both 30%-60%, wherein the cotton-feeling polyester filament yarn is provided with a fusion part A and anon-fusion part B. The knitted fabric provided by the invention has extremely strong appearance and hand feeling of cotton, and also has good air permeability.

The invention relates to the field of heavy-duty paint, and discloses metal flake type single-component water-based heavy-duty paint and a preparation method thereof. The water-based heavy-duty paintis prepared from the following raw materials in parts by mass: 40-60 parts of carbon titanium cage resin, 8-15 parts of rust-proof pigment, 20-30 parts of deionized water, 2-3 parts of a directional alignment agent, 1-3 parts of a dispersant, 1-2 parts of a defoamer, 0.5-1 part of a thickener and 0.5-1 part of a leveling agent. Selected metal flake such as aluminum flake and zinc aluminum alloy flake or aqueous aluminum silver paste with solid content higher than 70% have the double functions of cathodic protection and physical shielding in the paint, and corrosion resistance of a paint film is greatly improved. The prepared heavy-duty paint is novel carbon titanium cage water-based paint, has excellent corrosion resistance and strong adhesive force, and can be used alone or in combinationwith other intermediate paint and primer.

The invention discloses a preparation method of a fuel oil activator. According to the preparation method, rare earth waste is doped with nanosized TiO2, and the rare earth waste-doped nanosized TiO2 is compounded with tourmaline nano-powder and spinel ferrite so as to prepare a solid mixture; and then, water, a dispersant and a surfactant are added into the solid mixture to form solid-liquid mixed slurry. Mass ratio of rare earth waste to nanosized TiO2 to tourmaline nano-powder to spinel ferrite is 2-5: 1-3: 60-80: 5-9. Addition amount of water is 10-90% of the amount of the mixed slurry. Addition amount of the dispersant is 2-10% of the amount of the mixed slurry. Addition amount of the surfactant is 5-28% of the amount of the mixed slurry. The prepared fuel oil activator can improve oil quality, promote sufficient burning of fuel oil, raise burning efficiency and save fuel oil. By the use of the fuel oil activator, atomization quality can be raised, and fuel oil can be sufficiently burnt so as to reduce emission of harmful gases. Thus, the purpose of energy conservation and emission reduction is achieved.

The invention provides a high concentration photovoltaic-city power combined drive photovoltaic and photothermal integrated air source and water source dual-source heat pump energy system. According to the high concentration photovoltaic-city power combined drive photovoltaic and photothermal integrated air source and water source dual-source heat pump energy system and a running method thereof, waste heat of a traditional high concentration photovoltaic module is collected to make domestic hot water or to be supplied to a dual-source heat pump. Under a heat supplying mode, when sunniness is enough, concentrated photovoltaic direct current directly drives a compressor of the heat pump to take heat from air, and the heat pump is made to perform heat production cycle to prepare the hot watertogether with a high concentration photovoltaic heat collecting system; when the sunniness is not enough, low-temperature water generated by the heat collecting system flows through a refrigerant-water plate type heat exchanger, and the refrigerant-water plate type heat exchanger is taken as a dual-source evaporator of the heat pump together with an air-cooling heat exchanger to make the heat pump run to produce heat; and under conditions such as rain or at night when electricity cannot be generated, the heat pump system is driven by city power. Under a refrigeration mode, the heat pump runsin reverse to convey cooling capacity to users, and the hot water is conveyed to the users through the heat collecting system. By means of the high concentration photovoltaic-city power combined drivephotovoltaic and photothermal integrated air source and water source dual-source heat pump energy system and the running method thereof, solar energy is comprehensively and efficiently utilized, andthe high concentration photovoltaic-city power combined drive photovoltaic and photothermal integrated air source and water source dual-source heat pump energy system and the running method thereof are stable in running, not affacted by sunshine and other weather, capable of saving energy and environmentally friendly and have obvious economic advantages.

The invention discloses a fuel oil activator. According to the invention, graphene is doped with nanosized TiO2, and the graphene-doped nanosized TiO2 is compounded with tourmaline nano-powder and spinel ferrite so as to prepare a solid mixture; and then, water, a dispersant and a surfactant are added into the solid mixture to form solid-liquid mixed slurry. Mass ratio of graphene to nanosized TiO2 to tourmaline nano-powder to spinel ferrite is 2-10: 1-3: 63-78: 6-8. Addition amount of water is 12-88% of the amount of the mixed slurry. Addition amount of the dispersant is 3-7% of the amount of the mixed slurry. Addition amount of the surfactant is 7-25% of the amount of the mixed slurry. The prepared fuel oil activator can improve oil quality, promote sufficient burning of fuel oil, raise burning efficiency and save fuel oil. By the use of the fuel oil activator, atomization quality can be raised, and fuel oil can be sufficiently burnt so as to reduce emission of harmful gases. Thus, the purpose of energy conservation and emission reduction is achieved.

The invention relates to a remote sensing image surface element recognition method combined with multi-temporal features and a storage medium. The method comprises the following steps: 1, obtaining multi-temporal remote sensing image data; 2, respectively extracting time sequence correlation features and space-time spectrum three-dimensional discrimination features of the multi-temporal remote sensing image; step 3, performing cascade and batch normalization processing on the time sequence correlation features and the space-time spectrum three-dimensional discrimination features; 4, obtaining high-level semantic features through a full connection layer; and 5, classifying the high-level semantic features through a classifier to obtain a remote sensing image earth surface element recognition result. Compared with the prior art, the method has the advantages of high recognition precision, high accuracy, good stability and the like.

The invention discloses a method for low-cost high-quality cutting of solar-grade polycrystalline silicon chips. Mortar cutting fluid prepared from 1200# recycled silicon carbide and 1500# recycled silicon carbide after mixing is used for cutting the solar-grade polycrystalline silicon chips. The 1200# recycled silicon carbide and the 1500# recycled silicon carbide are mixed in use, D50 value of silicon carbide is increased, and accordingly integral cutting capacity of the mortar cutting fluid is improved, and quality of cut solar-grade polycrystalline silicon chips is further improved; production cost is lowered as the recycled silicon carbide is adopted; inventory of the 1200# recycled silicon carbide is consumed, silicon carbide recycling can be performed stably in the long term, and the defects of shortage and quality instability of the 1500# recycled silicon carbide in the market currently are made up.

The invention discloses an augmented reality method based on unmarked identification, relates to the technical field of indoor augmented reality, can overcome the limitation of marked augmented reality, realizes the function of unmarked augmented reality, and has stable performance under the conditions of large light change and rapid movement. The method comprises the following steps: obtaining visual information and IMU information; calibrating real-time video stream information; tracking and positioning the calibrated IMU information to obtain a real-time pose of the camera; and calculatinga real-time display visual angle of the virtual 3D model, and drawing the real-time virtual 3D model under the real-time display visual angle on the virtual object placement plane for combined display. The invention further discloses an augmented reality device based on unmarked identification, electronic equipment and a computer storage medium. According to the invention, through combination of the IMU information and the visual information, a better augmented reality effect can be obtained.

The invention discloses a preparation method of a novel wide-temperature high-efficiency non-toxic SCR (Selective Catalytic Reduction) catalyst and an application thereof. The general formula of the catalyst is AxFe(3-x)O4, wherein x is less than or equal to 1; and A is one or a combination of titanium, magnesium, manganese and nickel. The wide-temperature non-toxic iron-based denitration catalystis prepared by a coprecipitation method, the cost is reduced, and the defects that the traditional Fe-based SCR catalyst is low in denitration efficiency, narrow in temperature window, poor in stability performance and poor in selectivity can be effectively overcome. Under the conditions that the temperature is 200-450 DEG C, the air speed reaches 3000-200000h<-1> and nitric oxide flue gas contains 0-2700mg/m<3> of SO2 and 0-20% of water vapor, the denitration efficiency of the catalyst is stabilized at 90% or higher, and the N2 selectivity is stabilized at 95% or higher. The catalyst disclosed by the invention is applicable to nitric oxide emission control of fixed source flue gas in thermal power plants, coking plants and the like.

An embodiment of the invention discloses a biometric identification device and electronic equipment. The biometric identification device comprises the components of an external light source which is used for generating a first light signal, at least partial light signal in the first light signal is used for penetrating a screen and reaching a to-be-identified object above the screen; and a biometric identification module which is used for performing vein identification according to at least partial light signal transmitted from the to-be-identified object, wherein the light signal transmittedfrom the external light source can be fully reflected in the screen. The biometric identification device and the electronic equipment facilitate improvement of biometric identification safety and stability.

The invention discloses a novel multi-station jacquard needle control device of knitting machinery. The novel multi-station jacquard needle control device of the knitting machinery comprises an upper steel ring, a lower steel ring, a lower pulling head, a needle cylinder, needle selectors and jacquard needles. The jacquard needles move back and forth axially in axial grooves of the outer wall of the needle cylinder, the upper steel ring is fixed onto the upper portion of the needle cylinder and is concentric with the needle cylinder, the lower steel ring is fixed onto the lower portion of the needle cylinder and is concentric with the needle cylinder, every three needle selectors forms a group, all the four groups of the needle selectors are evenly distributed and fixed on the periphery of the lower steel ring, a center circle formed by fixing holes for installing the needle selectors is concentric with the lower steel ring, and the jacquard needles are evenly distributed inside the axial grooves of the outer wall of the needle cylinder. The novel multi-station jacquard needle control device of the knitting machinery has the advantages that achieving the effect that the low pushing head is used for controlling the jacquard needles to perform radial extrapolation motion in multiple stations and abandoning old spring piece type jacquard weaving. Therefore, in a working state, the radial movement and the axial movement of the jacquard needles are more accurate, sensitive and reliable, and wrong needle, missed stitch and needle collision during selection of the jacquard needle can be avoided.

The invention belongs to the technical field of material chemistry, and particularly relates to an amorphous stabilized nano composite anticorrosive pigment product and a preparation method thereof, the amorphous stabilized nano composite anticorrosive pigment product is characterized in that pieces of the benzotriazole composite zinc tungstate nano-assembled sheet-shaped anticorrosive pigment arecrossed with each other, the overall diameter of the benzotriazole composite zinc tungstate nano-assembled flaky anticorrosive pigment is about 1-2 microns, and the thickness of the nano-sheet assembled into the sheet-shaped structure is 150-200 nm. The amorphous stabilized nano composite anticorrosive pigment product has the characteristics of good stability, high temperature resistance, excellent corrosion resistance and the like.

The invention discloses an unmanned aerial vehicle group target coverage method under communication support, and belongs to the technical field of unmanned aerial vehicle group communication. The method comprises the following steps: making a circle by taking each target point as a circle center and a preset value as a radius, calculating the number of target points covered by each circle, reserving a set with the maximum number of covered points, and re-determining the circle center position covering each target point and adjacent points in the set by using a mean centralization means and a secondary perturbation strategy; and for uncovered target points, repeating the operation until all the target points are covered or the cluster number reaches the upper limit of the number of the unmanned aerial vehicles, so as to achieve the purpose that the unmanned aerial vehicle group covers multiple target points to the greatest extent in the communication support process. The unmanned aerial vehicle group communication support coverage problem is solved, the purpose that the unmanned aerial vehicle group covers multiple target points to the maximum degree in communication support is achieved, the stability and coverage rate of the result are improved, and the method can be used for task scenes such as cooperative communication support and cooperative interference of the unmanned aerial vehicle group.

The invention provides a walking control method and device based on laser and image information fusion, and the method comprises the steps: obtaining a laser reflection point column of a current region through a laser radar, and obtaining QR code information in a walking process through a code reading camera; performing linear fitting on the point column to obtain the pose of the crop column, and performing direction control according to the pose of the crop column; if the QR code is read in the driving process, reading field edge information in the QR code, and carrying out steering controlaccording to the read field edge information. The method uses the QR code to store the agricultural environment information which can comprise the information such as the edge-of-field passability and the edge-of-field number, and has the advantages of being low in cost, capable of providing abundant information and the like. Meanwhile, the method is not affected by shielding of crop branches and leaves and the like, and the defect that positioning precision is affected by shielding of GNSS and the like is overcome.

The present invention discloses a method of producing functional nutritious food by using sorghum as a raw material and belongs to the technical field of sorghum deep processing. The method improves stability of biologically active peptides in vivo. The method comprises the following steps: step a, an alkali dissolving and acid precipitating method is used to prepare the sorghum starch and sorghum proteins; step b, the obtained sorghum starch in the step a is prepared into starch milk, and the starch milk is subjected to microwave gelatinization, the gelatinized starch milk is cooled, the cooled starch milk is dried and the dried starch milk is crushed to obtain sorghum resistant starch; step c, the obtained sorghum proteins in the step a are prepared into a protein solution, the protein solution is preheated by water bath, the preheated protein solution is successively subjected to gradient enzymatic hydrolysis using trypsin, alkaline protease and flavor protease, the enzymatic hydrolyzed protein solution is subjected to high temperature sterilization, the sterilized protein solution is desalinated, and the desalinated protein solution is dried to obtain sorghum protein peptides; and step d, the sorghum resistant starch, octenyl succinate starch ester sodium and water are stirred evenly, then the sorghum protein peptides are added, the materials are homogenized, and the homogenized materials are spray-dried to obtain functional nutritious food. The method improves the stability of the protein peptides in vivo and ensures that the sorghum protein peptides can play the functions again in the effective time.

The invention relates to a PbS/SiO2 co-doped nano integrated conical optical fiber amplifier and a preparation method thereof, and belongs to the technical field of optical fiber technologies and nanomaterial preparation. The nano-integrated tapered optical fiber amplifier is composed of a tapered optical fiber and a PbS/SiO2 co-doped nano-film prepared on the surface of the optical fiber by using an atomic layer deposition technology, and an optical fiber amplification effect is realized through an evanescent wave principle. The nano-film is composed of PbS and SiO2 nano-materials which arealternately deposited, and the thickness of the film can reach the micron level. The SiO2 can effectively improve the surface defect structure of the PbS particles and improve the stability and dispersity, so that the luminous efficiency is improved, and the refractive index of the nano semiconductor film can be reduced. The prepared PbS/SiO2 co-doped nano film has the advantages of high dispersity, high doping concentration, low loss, high luminous efficiency, high stability and the like. The high-gain optical fiber amplifier is simple in structure, low in price and easy for industrial production.

The invention discloses a switched capacitor resistance feedback continuous time modulator based on variable resistance in the technical field of integrated circuit design. The switched capacitor resistance feedback continuous time modulator comprises a signal input end, an SCR DAC structure, switches, a CMP processor and a signal output end. Three groups of switches are arranged, the signal inputend is connected with the CMP processor through the switches, the CMP processor is connected with the signal output end, one end of the SCR DAC structure is connected with the signal input front endof the switch, the other end of the SCR DAC structure is connected with the signal output end, and the feedback resistance of the SCR DAC structure is adjustable. Thus, the power consumption of the system is reduced, and the stability of the modulator is improved.

The invention discloses an array float-type wave power generation device. The array float-type wave power generation device is characterized in that a power generation device body is composed of a front rack and a rear rack; the front rack is formed by a front support, a middle support and a rear support which are distributed on a left support base and a right support base; the front support, the middle support and the rear support are all composed of left vertical rods, right vertical rods and cross beams with pulleys; left vertical sliding grooves and right vertical sliding grooves which are in sliding connection with short shafts on the two side faces of transverse float bowls are formed in the lower ends of the inner walls of the left vertical rods and the right vertical rods; transmission parts are distributed at the front end of the rear rack; the transmission parts are composed of chain wheels, gears, left wheel hubs and right wheel hubs, the chain wheels and the gears are arranged on transmission shafts located between left bearing pedestals and right bearing pedestals, and the left wheel hubs and the right wheel hubs are arranged at the two sides of the corresponding chain wheels; rope chains with the other ends penetrating through rope chain holes to be connected with heavy objects are wound on the left wheel hubs, and bearing pedestals fixedly connected with a spindle are arranged at the rear end of the rear rack; a gear A with a chain wheel a, a gear B with a chain wheel b and a gear C with a chain wheel c are distributed on the spindle; the spindle is fixed to a left generator output shaft and a right generator output shaft through a left coupling and a right coupling; and the transverse float bowls are connected with, and the other ends of the rope chains penetrate through the pulleys and then are wound on the right wheel hubs. The array float-type wave power generation device is used for coastal waters.

The invention discloses a non-loading type nano-scale composite carbon-noble metal catalyst as well as a preparation method and application thereof. The catalyst is granular and the particle size is not greater than 20nm; each particle is formed by compounding one noble metal particle and one carbon dot; the average size of the carbon dots is 1 to 10nm and the average size of the noble metal particles is 1 to 10nm; noble metal is one of platinum, palladium, iridium, ruthenium and rhodium; the mass ratio of the noble metal to carbon is (0.01 to 0.3) to (0.5 to 2.5). The non-loading type nano-scale composite carbon-noble metal catalyst provided by the invention is applied to reaction of synthesizing chloroaniline through photo-thermal catalysis and hydrogenation via chloronitrobenzene, and has the characteristics of high conversion rate, high catalytic activity, high reaction speed and high stability.

The invention belongs to the technical field of new material processing, and particularly relates to a preparation method and application of a plastic net for capturing dust by utilizing static electricity. The preparation method comprises the following steps that after a plastic raw material is dried, and is mixed with electrostatic additive master batch to be fed into a screw extruder for five-zone heating melting; then a mixture enters a cold water tank for being cooled and formed in a spinning die head, is drawn by hot water of a group of drawing devices, bundles are collected and wound ona pan head, pan head is placed, frame wires are uniformly arranged for being weaved in a warp knitting machine, and is weaved into plastic net cloth; and corona discharge electret is carried out on the net cloth by direct-current high-voltage electricity to obtain the plastic net cloth for capturing the dust by utilizing the static electricity. The plastic net for capturing the dust by utilizingthe static electricity can be applied to adsorption window gauze, an air purifier, an intelligent air conditioner, air purification integrated equipment, an automobile air conditioner or a protectivemask. The net is uniform and stable in electrostatic charge distribution, high in electrostatic field intensity and high in capacity of adsorbing dust in air, and various properties of the electrostatic net are improved.

The invention provides a tundish nozzle steel blocking groove, a tundish nozzle and a preparation method. The tundish nozzle steel blocking groove comprises a steel blocking groove body and a blocking steel plate. The steel blocking groove body is of an inverted groove-shaped structure with the cross section being an arc, the two ends of the steel blocking groove body are closed, and the bottom edge of the steel blocking groove body is suitable for being connected with a tundish bottom working lining. A flow guide hole is formed in the arc side wall of the steel blocking groove body, and the steel blocking groove body is made of a refractory material. The blocking steel plate is arranged in the flow guide hole. The tundish nozzle steel blocking groove is provided with the flow guide hole, the blocking steel plate is arranged in the flow guide hole, molten steel can be temporarily prevented from entering the nozzle, and cold steel is prevented from being formed in the nozzle; large inclusions can be prevented from entering and blocking a water gap; a molten steel flow field around the nozzle is changed to prevent vortex around the nozzle; and short-distance molten steel flow is avoided, and inclusions in the molten steel can be conveniently adsorbed by a covering agent.