154results about How to "Reduce pollution impact" patented technology

The invention discloses a method for preparing silicon dioxide aerogel by using acidic silica sol and belongs to the field of preparation of inorganic heat-insulating materials. The method comprises the following steps of: directly forming gel under actions of acid and alkali catalysts by using acidic silica sol as a raw material, wherein the process for preparing the gel does not involve organic solvent so as to improve the security of production; and preparing SiO2 aerogel through supercritical or constant pressure drying after the gel is subjected to solvent replacement and surface silylation. According to the method, the process for preparing the sol by using organic silicon as raw material and a complicated process for removing salt in water glass are avoided; and because the acidic silica sol with low cost and stable performance is used as the raw material, the method has the advantages that the process is simple, the production cycle is short, the reaction process is controlled, and the requirement and investment of the equipment are low, so that the industrial production of SiO2 aerogel can be realized.

The invention discloses a preparation method of silica aerogel, and belongs to the field of preparation of inorganic porous materials. The preparation method includes: allowing alkaline silica sol to form aerogel directly under the action of acid catalyst and base catalyst; performing solvent displacement and surface silylanizing; and supercritical or atmospheric drying to obtain SiO2 aerogel. Organic solvents are not used in sol formation, and accordingly dangers in sol formation are eliminated. The complex process of sol preparation by organosilicone and desalination by sodium silicate is omitted from the aerogel preparation, the alkaline silica sol low in cost and stable in performance is used as raw material, process is simple, production cycle is short, reaction process is controllable, equipment requirements and investment are low, and industrial production of SiO2 aerogel is achieved.

The invention discloses a wastewater recycling treatment process, which comprises the following steps: leading raw water to pass through a filter for removing suspended matters and solid particles in the raw water, leading outlet water of the filter to enter into an ion exchanger, removing calcium and magnesium ions in the raw water through ion exchange, further removing the hardness in the water, leading the outlet water of the ion exchanger to enter into a decarbonizing tower, and removing the alkalinity of the raw water under the air stripping action of a rotary fan; leading the raw water out of the decarbonizing tower to enter into a precision filter under the action of a lifting pump, lifting the outlet water of the precision filter to a nano-filtration / reverse osmosis system which is mainly formed by parallel connection and / or series connection of a nano-filtration membrane and a reverse osmosis membrane under the action of a high pressure pump, leading the nano-filtration / reverse osmosis system to discharge concentrated water, leading the nano-filtration / reverse osmosis system to drain produced water into a produced water tank, and becoming the final outlet water. The process can effectively avoid the membrane pollution, improve the recycling rate, further greatly reduce the discharge amount of wastewater, simultaneously reduce the using amount of membranes due to the improvement of running conditions of a membrane system and further reduce the investment and the running cost.

The invention discloses a membrane bio-reactor (MBR) used for treating preserved szechuan pickle wastewater and reinforcing biological phosphorous and nitrogen removal. An integrated reactor is formed by an A<2> / O process, a biological membrane process and the MBR. The MBR comprises an anaerobic tank, an anoxic tank, an aerobic tank, a feeding system, an aerating system, a drainage system and automatic control equipment, wherein semi-soft biological membrane fillers are put in the anaerobic tank, the anoxic tank and the aerobic tank; a membrane component is put in the aerobic tank, and a membrane separation region is not independently arranged. The reactor has the advantages that anaerobic phosphorus release and phosphorus accumulation in the aerobic tank are carried out via the sludge on the biological fillers in the anaerobic tank, thus increasing the total removal rate of phosphorus in the sewage; organic matters undergo hydrolytic acidification and organic nitrogen is aminated after the preserved szechuan pickle wastewater passes through the anaerobic tank; nitrification liquor in the aerobic tank flows back to the anoxic tank to form denitrification in the anoxic tank. The MBR has a simple structure and high pollutant treatment efficiency, is light in membrane pollution, and can simultaneously treat the pollutants such as organic matters, total nitrogen, total phosphorus, SS and the like of high salinity wastewater.

The invention discloses a partial pilot frequency multiplexing method for overcoming pilot pollution in a large-scale MIMO system. The method includes following steps: (1) in the training stage, users determine the size of the interference according to received signals and transmit the information to a base station; (2) the base station determines a signal to interference and signal ratio threshold according to different numbers of the users in a cell and divides the users into strong interference users (edge users) and weak interference users (central users) according to the information uploaded by the users; and (3) the same set of pilot frequency is distributed to the weak interference users (central users) of different cells, and different pilot frequencies are distributed to strong interference users (edge users) of adjacent cells. According to the method, the same set of pilot frequency is multiplexed by central users of different cells so that the same pilot frequency is multiplexed by them and the utilization rate of the pilot frequency is increased; the edge users of the adjacent cells employ different pilot frequencies so that interferences are reduced; and in this way, the influence of pilot pollution is reduced, and the utilization rate of the pilot frequency is increased.

The invention provides a small-scale fading channel estimation method orientated to a large-scale array antenna MIMO communication system. In the method, firstly, large-scale fading estimation values from user terminals of all adjacent regions to a target cell base station are sorted from small to large, and strong interference users of the adjacent regions are selected according to channel estimation residue processing ability of the target cell base station; on the basis, a multi-cell large-scale fading matrix and a multi-cell system matrix are built, joint channel estimation is conducted on pilot frequency receiving signals separated from the base station according to the MMSE criterion, and therefore high-accuracy estimation of an ascending small-scale fading channel from a target cell user to the target cell base station is obtained. In addition, periodic random allocation is conducted on user ascending pilot frequency sequences according to the interference randomization principle, and adjacent region interference caused by cross-correlation difference among the pilot frequency sequences is reduced. The small-scale fading channel estimation method can effectively increase accuracy of small-scale fading channel estimation of the large-scale MIMO system.

The invention discloses a utilization method of a ZSM-48 molecular sieve and relates to the technical field of synthesis of molecular sieves. The method comprises the following steps: crystallizing the ZSM-48 molecular sieve and separating to obtain mother liquid for recycling; utilizing all or part of the mother liquid; using the mother liquid as one part of the synthesis raw materials of the ZSM-48 molecular sieve; and correspondingly replenishing fresh raw materials according to the synthesis proportioning to prepare and synthesize a gel mixture of the ZSM-48 molecular sieve for the next step of synthesis so as to recycle the mother liquid of the molecular sieve. By the utilization method of the mother liquid of the molecular sieve, the utilization ratio of a template agent in the synthesis process of the molecular sieve can be increased, the time of the crystallization in the next step is shortened due to a large amount of ZSM-48 molecular sieve microcrystal in the mother liquid, and wastewater pollution in the production process of the molecular sieve is reduced due to recycling of the mother liquid.

The invention relates to a film separating biology reactor to realize film pollution problem. The solid and liquid separating film component and the first non-bubble aeration biology film component are set in biochemical reaction vertically. The solid and liquid separating film component and the first non-bubble aeration biology film component are paralleling. The separating film component connects to water outlet pipeline, and the suction pump connects to water outlet pipeline in series. The invention is placed with solid liquid separating film alternating. The aerator pipe and distributing pipe are set between two films. It is benefit to fully mix organic pollutant and active sludge. It could effectively solve the film pollution problem.

A method of a pretreatment that is a desilication of bauxite surface by a reverse flotation relates to a method of the flotation towards diasporic bauxite, including the courses of grinding, a solid-liquid separation and the reverse flotation. The method is characterized in that before the desilication of the bauxite mineral by the reverse flotation, the surface of the mineral is pretreated by hot alkaline solution. The method of the intention can make a concentrate grade (an alumina-silica ratio) after the desilication by the reverse flotation improved 0.5 to 1 than the concentrate grade after the ordinary desilication by the reverse flotation and make a coefficient of recovery increase by 2 percent to 8 percent. The chemical entrainments of coarse particles are greatly reduced. A concentration adjustment of the flotation system of the present invention is convenient, and the balancing time is short, at the same time novel water can be used for further washing a red mud, which can reduce an alkalescence of the red mud and decrease the pollution influence on environment. The water after washing red mud is added into a grinding machine for the treatment of ore surface as the recycle utilization.

The invention discloses a method for calculating effect of traffic flow on city pollution. The effect on the city pollution is calculated according to the vehicle shape of the traffic flow; 1) fast identifying the sizes of vehicles, wherein the sizes of the vehicles are classified by the classification technology based on the under color of a license; the vehicle of which the under color of the license is blue is a car and the vehicle of which the under color of the license is yellow is a cart; 2) after determining the size of the vehicle according to the under color of the license, setting the emission factors according to the speeds of the vehicles; 3) turning the factors into the identified or given different emission indexes of the vehicles to generate the concentration of exhaust dust and carbon monoxide (CO) of a road; and performing difference approximation on each road region to calculate concentration by taking an advection equation as a pollution model ; and 4) defining the concentration of the exhaust dust according to the transmission of inertia light,; performing conversion on the transmission (VI%) of 100m distance by natural logarithm; and calculating the CO concentration in PPM.

The invention relates to a magnetorheological fluid-based oil-gas well temporary plugging agent as well as a preparation method and an application thereof. The temporary plugging agent is prepared from carbonyl iron powder modified by a surface modifier as magnetic particles and white oil as a carrier liquid. The invention also provides a preparation method and an application of the temporary plugging agent. The temporary plugging agent disclosed by the invention is good in stability, friendly to environment, low in raw material, simple in preparation technology, and applicable to industrial production, and can be applied to the temporary plugging occasion in development and production processes of oil and gas fields.

The invention discloses a method for preparing silicon dioxide aerogel by using acidic silica sol and belongs to the field of preparation of inorganic heat-insulating materials. The method comprises the following steps of: directly forming gel under actions of acid and alkali catalysts by using acidic silica sol as a raw material, wherein the process for preparing the gel does not involve organic solvent so as to improve the security of production; and preparing SiO2 aerogel through supercritical or constant pressure drying after the gel is subjected to solvent replacement and surface silylation. According to the method, the process for preparing the sol by using organic silicon as raw material and a complicated process for removing salt in water glass are avoided; and because the acidic silica sol with low cost and stable performance is used as the raw material, the method has the advantages that the process is simple, the production cycle is short, the reaction process is controlled, and the requirement and investment of the equipment are low, so that the industrial production of SiO2 aerogel can be realized.

The invention relates to the technical field of building materials and in particular to 3D printing alkali-fast cement concrete which is made of ore slag and steel slag as raw materials. The concreteis made of the following raw materials: solid granules, an alkali excitant, a retarder and water, wherein the mass of the alkali excitant accounts for 4-10% of the mass of the solid granules; the retarder accounts for 0.5-3.5% of the mass of the solid granules; the water accounts for 10-45% of the mass of the solid granules. Ore slag powder and steel slag powder are adopted as main raw materials,an alkali excitation technique is implemented, the preparation method is simple and easy to operate, high-temperature calcining is avoided, the energy consumption is reduced, a great amount of lands occupied by industrial waste slag discharge such as steel slag are saved, and the lands are protected and saved. Dependence to natural resources is reduced, the energy is saved, CO2 emission is reduced, environment pollution is alleviated, and in addition, due to a 3D printing technique, the construction and maintenance time can be shortened, the time for casting and demolding a concrete structureis shortened, the construction efficiency is improved, and materials are saved, and the like.

The invention provides a direct-current driven freezing and refrigerating car. The direct-current driven freezing and refrigerating car comprises a carriage, and is characterized by further comprising a refrigerating system, a cold storage system and a multi-power supplying system, wherein the refrigerating system comprises a direct current refrigerating compressor, a refrigerator, a liquid storing device, a dry filter, a first solenoid valve, a first expansion valve, an evaporator and a gas-liquid separating device which are sequentially connected to form a loop; the cold storing system comprises a direct current refrigerating compressor, a condenser, a liquid storing device, a dry filter, a second solenoid valve, a second expansion valve, a cold storing device and a gas-liquid separating device which are sequentially connected to form a loop; the evaporator and the cold storing device are both arranged in the carriage; the multi-power supplying system is used for supplying power to the direct current refrigerating compressor; and the multi-power supplying system comprises a direct current switch power supply, a storage battery, a direct current generator, a first switch and a second switch. With the adoption of the direct-current driven freezing and refrigerating car under the scheme, the temperature in the carriage of the freezing and refrigerating car can be reliably ensured, thus, the risks in cold-chain transportation are greatly reduced; and the direct-current driven freezing and refrigerating car is convenient to use and low in operating cost, and can greatly reduce tail gas emission.

The invention relates to a production method of triethyl phosphite, which belongs to the technical field of chemical production. Absolute ethyl alcohol, phosphorous trichloride are taken as main material, pure benzol is taken as solvent, triethylamine is taken as acid-binding agent, liquid ammonia is taken as reducing agent, and the triethyl phosphate is prepared through the processes of three-complex liquor preparing, synthetic reaction, water scrubbing reaction, layering, drying, crude distillation, rectifying, recovering and ammonia recovery and the like. The method adopts continuous production process of triethylamine, the material charging and the product discharging are continuous, the production capacity is strong, and the product quality is stable. With equal equipment and investment, the capacity of the method can be 6 to 7 times as the capacity of intermittent method. The method solves the problems of the prior production method that the production capacity is small, the production cycle of the product is long, the material consumption is large, the quality is unstable, the discharge amount of 'three wastes' is large, and the yield can not be guaranteed. The method has the advantages that the liquid ammonia is taken as reducing agent, the cost is low, the recovery factor of excess ammonia can reach more than 90 percent, the recovered ammonium chloride can be used as the crude product of ammonium fertilizer, the production cost is lowered, and the environmental pollution is reduced.

The invention discloses a preparation method of fullerol. The preparation method comprises the following steps: (1) dissolving fullerene in an organic solvent, wherein the organic solvent is selected from an organic matter which is higher than water in relative density, immiscible with water and can dissolve fullerene; then, respectively putting fullerene C2n which is dissolved in the organic solvent, a hydroxylation reagent aqueous solution with appointed concentration and a phase transfer catalyst into a reactor and layering, wherein a water phase is in the upper layer while the organic solvent in the lower layer; (2) opening a reaction system without isolating air, and after continuously stirring for 10-72 hours at room temperature, stopping reaction; (3) separating liquids, after washing the organic solvent with water, recovering for later use, and recovering the solvent from the water phase to obtain a cured fullerol coarse product; and (4) refining the fullerol coarse product to obtain solid pure fullerol. The synthetic process disclosed by the invention is simple, efficient, convenient to operate and easy for scaled production, and the prepared fullerol shows a good electron paramagnetic spinning property.

The invention discloses a preparation method of semi-aromatic polyamide. In the method, aromatic dicarboxylic acid and a recovery aliphatic diamine concentrated solution containing 4-14 carbon atoms are used for preparing the semi-aromatic polyamide, thereby reducing the waste of raw material diamine in production, reducing the production cost and simultaneously lightening the influence of environmental pollution. The semi-aromatic polyamide has higher crystallinity, inherent viscosity and heat-resistance temperature, good hue, low active terminal group content, good processing stability and no corrosion to moulds. Through a prepolymerization reaction, a prepolymer with the inherent viscosity [eta] within the range of 0.06-0.3dl / g measured in 96 percent sulfuric acid at 25 DEG C can be obtained. After a tackification reaction, the inherent viscosity [eta] of the semi-aromatic polyamide is 0.8-2.5dl / g, the melting point of the semi-aromatic polyamide is 270-330 DEG C, the content of terminal carboxyl groups is 15-80mol / t, and the content of terminal amino groups is 15-80mol / t.

The invention relates to a method for producing sodium metabisulfite or sodium sulphite. The method comprises the following steps of: firstly calcining the gypsum and coke serving as raw materials in a rotary kiln to prepare gas sulphur dioxide; then generating the gas sulphur dioxide subjected to purification treatment into a suspension liquid of the sodium metabisulfite or sodium sulphate, controlling the pH value of the suspension liquid to be 3.8-4.1, carrying out centrifugal dehydration on the suspension liquid by using a centrifugal machine, then drying and separating to obtain the finished product sodium metabisulfite or sodium sulphite, and absorbing tail gases by using a tail gas washing tower; and in the preparation process of the gas sulphur dioxide, controlling the content of O2 of the tail gases in the rotary kiln to be 0.05%-1.0% and the content of CO to be less than 0.4% according to the weight percentage content. The purities of sodium metabisulfite and sodium sulphite product prepared by using the method can respectively reach up to 97.5%-98.5wt% and more than 93wt% and is completely in line with national standards. According to the method, the route of raw materials for producing the sodium metabisulfite is widened.

The invention discloses a method for repairing heavy metal pollution tailings with charcoal-based slow release fertilizer and imperata cylindrica. The method includes the following steps that according to the mass ratio, 1-5 parts of charcoal, 100 parts of polyurethane emulsion with the concentration being 40%-50%, 5-10 parts of starch and 150-300 parts of distilled water are mixed to prepare a coating solution; 40-60 parts of composite organic fertilizer particles are suspended into 10-20 parts of the prepared coating solution, and slow release coating treatment is conducted to obtain the charcoal-based slow release fertilizer; the prepared charcoal-based slow release fertilizer is mixed with the heavy metal pollution tailings; and the imperata cylindrica is planted into the tailings containing the charcoal-based slow release fertilizer. By the adoption of the method, the treating effect of the heavy metal pollution tailings is good, the method is environmentally friendly, cost is low, and pollution is small; and heavy metal pollution is reduced, and meanwhile cycling utilization of recourses and lasting effect playing of fertilizer nutrients can be achieved.

The invention relates to a foam concrete foaming agent and a preparation method thereof. The foaming agent is prepared from the following ingredients in parts by mass: 0.3 to 0.9 percent of anion active agents, 0.13 to 0.21 percent of methyl glucoside polyoxyethylene ether bi-olein, 0.01 to 0.04 percent of hydroxyethylcellulose and 0.02 to 0.05 percent of polypropylene crosslinking resin, wherein the anion active agents are one kind of materials from neopelex, sodium dodecyl sulfate or fatty acid polyoxyethylene ether sodium sulfate. According to the preparation method, the substances in the corresponding mass percentage are respectively taken, are mixed and are uniformly stirred to obtain the foam concrete foaming agent. The foam concrete foaming agent has the advantages that the raw materials can be easily obtained; the pollution is little; green and environment-friendly effects are achieved; the cost is low; the wide application can be realized; good economic benefits are realized; the parameters such as the foaming times, the settlement distance, the water bleeding quantity and the like of the foam concrete foaming agent are tested; relatively good effects are achieved.

The invention discloses a water discharge and drainage system and a construction method adopting a basement bottom plate water buoyant force releasing method. According to the water discharge and drainage system, crisscross netty water drainage blind ditches are dug in undisturbed soil or overbreak filling below a basement bottom plate, a continuous plastic protective screen is laid in each water drainage blind ditch, plastic blind ditch pipes are buried in the water drainage blind ditches provided with the corresponding plastic protective screens in a laid mode and covered with gravel drainage layers, water discharge openings of the plastic blind ditch pipes communicate with a water collection well, and the water collection well is connected with a water discharge device through a transparent water pipe; and polyethylene protective-film partition slurry layers are laid on the gravel drainage layers, concrete cushions are poured on the polyethylene protective-film partition slurry layers, and the basement bottom plate is arranged on the concrete cushions. According to the water discharge and drainage system and the construction method adopting the basement bottom plate water buoyant force releasing method, the water level under the basement bottom plate can be lowered, and the buoyant force exerted on the basement bottom plate is released and attenuated. Accordingly, the effect that the basement bottom plate is always in the dynamic equilibrium state can be ensured.

The invention discloses a method for removing carbon impurities in silicon carbide micropowder. The method comprises the following steps: injecting water into silicon carbide micropowder to prepare slurry, adding a dispersant in the slurry to adjust the PH value, centrifuging the silicon carbide slurry by a centrifugal device, injecting water into the slurry again to prepare slurry, adding floatation oil in the slurry, injecting the mixture into a hydraulic classification device, continuously pumping air to stir, performing hydraulic flotation, then performing alkali washing to the obtained slurry, adjusting the PH value, cleaning, adding a filter aid, performing pressure filtration, placing the product in the oxidizing atmosphere to perform forced drying, and then cooling to room temperature to obtain the purified silicon carbide micropowder product. By adopting the method, the circulation of industrial water can be realized; and silicon carbide is dried in the oxidizing atmosphere, the stability and reliability of the silicon carbide micropowder can be increased, the flow is simple, the equipment dependency degree is low, and the method is suitable for industrialized mass production.

The invention discloses a differential dew point measuring method and a differential dew point measuring device. The device comprises a carrier, a temperature measurement sensor and a microcontroller for acquiring and processing temperature data and image data, wherein the carrier comprises frosted glass and polished glass, the condensation surfaces of which are downward; the frosted glass and the polished glass are inlaid in the lower port of a temperature controller; a refrigerator and a heater are arranged in the temperature controller; a charge coupled device (CCD) camera and a surface light source for lighting the condensation surface of the frosted glass and the condensation surface of the polished glass are arranged below the lower port of the temperature controller; and the temperature measurement sensor is arranged on the carrier and connected with the microcontroller. The device has the advantages of high sensitivity and low dust pollution influence; and because the condensation surfaces of the frosted glass and the polished glass are downward, the dust accumulating speed is reduced, and accuracy and precision of detection results are improved.

The invention discloses high-nutrient tomato fertilizer. The high-nutrient tomato fertilizer is prepared from raw materials in parts by weight as follows: 200-210 parts of rice straw, 20-21 parts of kaolin, 10-11 parts of urea, 10-11 parts of sugarcane top, 4-5 parts of prawn shells, 4-5 parts of peat soil, 3-4 parts of brown sugar, 0.5-0.6 parts of ferrous sulfate, 4-5 parts of candy pomace, 12-13 parts of fish meal, 15-16 parts of polyvinyl alcohol, 1-1.1 parts of tea polyphenol, 1-1.1 parts of carbon nanotubes, 1.2-1.3 parts of beta-cyclodextrin and 800-810 parts of ammonia water with the concentration of 28%. Amino groups are introduced into biochar prepared from the rice straw and can be chelated with heavy metal, the heavy metal adsorption capacity of the fertilizer is improved, and the contamination effect of the heavy metal on soil and the environment is relieved; further, the carbon nanotubes are added to an enveloping liquid, the mechanical strength of a film can be improved, and the slow release effect of the film can be improved by means of the added tea polyphenol; besides, the fertilizer contains high nutrients and can improve the yield and quality of tomatoes.

The invention provides a hollow partition plate stationary blade profile correcting method which solves the problem in the existing die correcting method that secondary deformation of a blade is easy to cause, and a correcting effect is poor. The method includes die correction which includes that a correcting die is arranged in a press. The method is characterized in that before the die correction, a cavity of the hollow partition plate stationary blade is filled with filling materials, the blade is arranged in the correcting die, the press is used for exerting pressure on the correcting die to conduct die correction on the blade profile, after the correction is finished, the filling materials in the cavity of the blade are removed, and the blade can enter the next machining procedure.

A planting method for Manicure Finger grapes includes the following steps that firstly, a garden plot is selected and prepared, planting furrows are dug, organic fertilizer is applied to the bottoms of the planting furrows, and the upper half of the organic fertilizer is filled with surface soil, wherein the depth of the planting furrows is 0.8 m, the width of the planting furrows is 1 m, the row spacing is 1.8-2 m, 4000 kg-5000 kg of organic fertilizer is applied per 667 square meters of land, and the organic fertilizer is prepared from, by weight, 15 parts of animal manure, 5 parts of fermented soybean cakes, 8 parts of fermented rapeseed cakes, 10 parts of rice hulls and 15 parts of pond silt; secondly, cuttage branches are cut and treated; thirdly, the treated cuttage branches are placed upside down to promote rooting; fourthly, cuttage and garden establishment are carried out; fifthly, field management is carried out; sixthly, fertilization is carried out; seventhly, shoot management is carried out; eighthly, irrigation and drainage and weeding are carried out. By means of the planting method, Manicure Finger grapes can grow rapidly, and the yield can be increased.

The invention discloses zinc-rich watermelon fertilizer. The zinc-rich watermelon fertilizer is prepared from raw materials in parts by weight as follows: 200-210 parts of rice straw, 20-21 parts of kaolin, 4-5 parts of peanut hulls, 1-2 parts of brown sugar, 10-11 parts of urea, 2-3 parts of eggshell powder, 0.1-0.2 parts of lactic acid bacteria, 1-1.1 parts of potassium oxide, 1.2-1.3 parts of calcium magnesium phosphate fertilizer, 1.1-1.2 parts of zinc sulfate, 15-16 parts of polyvinyl alcohol, 1-1.1 parts of tea polyphenol, 1-1.1 parts of carbon nanotubes, 1.2-1.3 parts of beta-cyclodextrin and 800-810 parts of ammonia water with the concentration of 28%. Amino groups are introduced into biochar prepared from the rice straw and can be chelated with heavy metal, the heavy metal adsorption capacity of the fertilizer is improved, and the contamination effect of the heavy metal on soil and the environment is relieved; further, the carbon nanotubes are added to an enveloping liquid, the mechanical strength of a film can be improved, and the slow release effect of the film can be improved by means of the added tea polyphenol; besides, the fertilizer is rich in zinc and can increase the zinc content of cultivated watermelons.

The invention discloses an AP selection method of a cell-free large-scale antenna system. The method comprises the following steps: 1, for a cell-free large-scale antenna system comprising M APs and K users (K is greater than T and less than M), the K users share the T pilots in a pilot multiplexing mode. 2, each AP judges the user type according to the distance between the AP and the user, wherein the user type comprises the I type, the II type and the III type; 3, for I-type users of the APs, the APs directly serve as service APs of the users; for the II-type users of the AP, if the I-type users exist, the providing of services for the II-type users is abandoned when the II-type users of the AP share the pilot frequency with the I-type users; otherwise, services are provided for the I-type and II-type users at the same time; if only the II-type users exist, the II-type users of the AP are allowed to share the pilot frequency according to a fairness principle; for the III-type users of the AP, the AP will give up to provide service for the users. Pilot frequency pollution can be effectively avoided, the system energy efficiency is improved, and the bit error rate of a receiving end for demodulating signals of a sending end is reduced.

The invention discloses a grape planting method. The method includes the following steps that first, the ground is leveled, and furrows with the width ranging from 30 cm to 60 cm and the depth ranging from 20 cm to 30 cm are excavated at the interval of 1 m to 3 m; second, grape vines are prepared, and the grape vines are reproduced into grape seedlings through stem cutting; third, on the ground leveled in the first step, the grape seedlings obtained in the second step are planted between the furrows, and the row spacing ranges from 1.5 m to 3 m; fourth, watering is performed once within 12 hours after plantation, watering for maintenance and supplementation is performed once within 24-72 hours after plantation, and the ground is kept moist; fifth, fertilization is performed between the third day and the seventy day after plantation, and people pay attention to watering maintenance; sixth, branches are clipped according to the growing condition of the grape vines, it is guaranteed that the grape vines evenly grow, and sufficient lighting is achieved. The grape planting method is particularly applicable to plantation in a novel high-yield variety vineyard, the lighting rate of the grape vines can be effectively controlled, the optical energy utilization rate is high, environmental pollution influences on obtained grapes are small, and market value is high.

The invention discloses an efficient, environment-friendly and safe powder body combustion system of an industrial kiln. The efficient, environment-friendly and safe powder body combustion system comprises a solid fuel ultra-refining device, a feeding device, a micro powder modifying device, a powder body conveying control and distribution safe device, a combustor and a hearth, wherein the solid fuel ultra-refining device is connected with the powder body inlet of the feeding device; the powder body outlet of the feeding device is connected with the material inlet of the micro powder modifying device; the micro powder modifying device is connected with the combustor through the powder body conveying control and distribution safe device; the combustor is arranged in the hearth; and the combustor is connected with a high-pressure fan so as to supply high-pressure air for combustion. The efficient, environment-friendly and safe powder body combustion system has the advantages that: powder body fuels have longer combustion time, can be fully combusted, and is high in heat release value, low in residual amount and emitted amount, so the system is high in environment friendliness.