321results about How to "Less variety" patented technology

The present invention discloses one kind of urea-formaldehyde foam as plant cultivating matrix and its preparation process. The urea-formaldehyde foam as plant cultivating matrix is prepared through the following steps: 1. mixing formaldehyde and urea to produce polycondensation reaction to obtain urea-formaldehyde resin solution; 2. mixing sodium butyl naphthalenesulfonate to obtain foaming liquid; 3. foaming the urea-formaldehyde resin solution with the foaming liquid in a foaming machine to obtain liquid foam; 4. solidifying the liquid foam and drying to operate foamed matrix; and 5. eliminating aldehyde group from the matrix to obtain urea-formaldehyde foam as plant cultivating matrix. The preparation process is simple and low in cost, and the prepared urea-formaldehyde foam as plant cultivating matrix has penetrating porous structure, high hydroscopicity and high soil-less culturing character.

In this invention, oxime is used as raw material being hydrolyzed in acid solution. Said hydrolytic process is coupled with osmotic vaporization membrane separation technique. The produced organic by-product ketone is removed by said membrane directionally and high efficiently. Thus recovers the limitation of the reaction chemical equilibrium of the hydrolysis, proceeding the reaction to the direction of production of hydroxylamine salts. This technique enhances the conversion rate greatly with high yield of hydroxylamine salts. This inventive method is better than prior art method with advantages of: simple process, less kinds of raw materials being needed, easy to operation, no side reaction, mild reaction condition and high yield of hydroxylamine salts being up to 80%.

The invention belongs to the field of sea water quality standard measurement, and particularly relates to a measurement method for water total nitrogen content in seawater culture. Firstly, absorbance of standard liquid is measured, and the steps of measurement include that after the potassium nitrate standard liquid is diluted by means of diluents, alkaline potassium persulfate solutes are added for oxidation, the mixing liquid is heated and then cooled, digestion products are obtained, hydrochloric acid solutes are added into the digestion products, the digestion products are diluted by diluents after being dissolved, the absorbance is measured by means of an ultraviolet spectrophotometer, and a standard curve is drawn according to an adjusted value of the absorbance. Then a seawater sample is measured according to measurement steps of the absorbance of the standard liquid, the value of the absorbance is obtained, and eventually the total nitrogen content in the sample is calculated according to the standard curve. Compared with a measurement method for seawater in the prior art, the measurement method omits a middle conversion process, measurement steps are simple, convenient, quick and precise, and measurement time is 2.5 hours shorter than that of an existing measurement method. According to the measurement method, reagent variety is few, used amount of reagents is little, and measurement cost is saved.

The invention relates to a three-level type automatic ammunition-filling ammunition-pressing production line, which comprises six anti-explosion chambers, wherein the six anti-explosion chambers are composed of three ammunition-filling chambers and three ammunition-pressing chambers which are staggered. Rotating anti-explosion doors are respectively arranged among the anti-explosion chambers and anti-explosion walls positioned at two ends of each anti-explosion chamber and outside each anti-explosion chamber. Each ammunition-filling chamber is provided with a flow line, and an ammunition conveying mechanical hand, an ammunition sleeve wiping machine, a multi-station turntable and a die delivery device are sequentially arranged on an inlet of the flow line. The other side of an ammunition-weighing ammunition-filling machine is provided with a connecting gate type anti-explosion door, and an ammunition outlet is located on an ammunition barrel conveying device positioned above the ammunition-weighing ammunition-filling machine. The ammunition-weighing ammunition-filling machine is arranged on one side of the multi-station turntable, and an ammunition-flushing wiping device is arranged on the other side of the multi-station turntable. The inside of each ammunition-pressing chamber is also provided with a flow line, and a die delivery device which is the same as the die delivery device in each ammunition-filling chamber, a multi-station turntable which is the same as the multi-station turntable in each ammunition-filling chamber, an ammunition sleeve lifting device and an ammunition conveying mechanical hand which is the same as the ammunition conveying mechanical hand in each ammunition-filling chamber are sequentially arranged on the flow line. A pressing machine and an auxiliary device are arranged on one side of each multi-station turntable. The three-level type automatic ammunition-filling ammunition-pressing production line can be widely used for production of dangerous articles which are inflammable and explosive.

The invention discloses a method for preparing nanoscale sheet cerium oxide by a hydrothermal method. The method comprises the following steps of: 1) preparing a 0.01-0.05mol / L Ce<3+> ion aqueous liquor at room temperature; preparing an ammonia water liquor at room temperature, wherein pH value of the ammonia water liquor is greater than 11; 2) placing the ammonia water liquor in a reaction kettle in a temperature range from -10 DEG C to 20 DEG C, taking the Ce<3+> ion aqueous liquor, and slowly dropping to excessive ammonia water liquor while stirring; and 3) stirring the mixed liquor obtained in the step (2) at constant temperature for reacting for 2-24 hours, centrifugalizing after reaction, removing the supernatant liquid, washing the powder obtained by centrifugalization and drying to obtain the solid sheet cerium oxide. According to the method disclosed by the invention, the nanoscale sheet cerium oxide is synthesized by one step by the hydrothermal method. The method is simple in preparation process, and low in demand on production and process conditions. No template materials are required and no organic solvents are added. The method is basically free from pollution and very environmental-friendly.

The invention provides a method for preparing chlorinated-2-acetyl-1,10-phenanthroline amine iron (II) complex with the structural formula of formula (I) and an application of the obtained complex as an ethylene oligomerization catalyst, wherein variables in the formula (I) are defined in the specification. According to the method, triethyl aluminum which is adopted as an initial raw material in the process of the preparation of 2-acetyl-1,10-phenanthroline from 1,10-phenanthroline is hydrolyzed and undergoes an oxidation reaction with nitrobenzene to obtain 2-acetyl-1,10-phenanthroline, 2-acetyl-1,10-phenanthroline is condensed with substituted aniline to obtain a 2-acetyl-1,10-phenanthroline amine ligand, and the ligand is reacted with iron dichloride to obtain the complex. The synthetic method of the invention, which has the advantages of less step, simple technology, and catalyst preparation cost reduction, and adopts nontoxic triethyl aluminum to replace potassium cyanide used in routine preparation methods, has a wide industrialization prospect.

The invention belongs to the technical field of printing dyes in weaving, printing and dyeing industry, and concretely relates to a prepared active dye-based ink formula, preparation, and a color-separation printing method of using the dye-based ink formula to divide a pattern into CMYK four colors. According to the provided active dye-based ink formula, the ink is composed of an active dye, a thickening agent, a surfactant, a humectant, a bactericide, a pH buffering agent and deionized water. Additionally, the invention provides the preparation method of the ink and the application technology. Dye fixation is realized in a heat baking drying process after ink-jet printing, and the problem is overcome that color matching is difficult during large-scale four color separation printing after an ink-jet printed sample is confirmed.

The dispersed tablet of proton pump inhibitor is used for treating gastric ulcer, duodenal ulcer, stomal ulcer and other indications. It contains at least one kind of proton pump inhibitor and at least one kind of biologically acceptable buffering agent in the weight ratio of 1 to 10-200. The proton pump inhibitor is one selected from omeprazole, S-omeprazole, pantoprazole, lansoprazole, rabeprazole, leminoprazole, tenatoprazole and their salts. The biologically acceptable buffering agent is sodium bicarbonate, sodium carbonate, magnesium carbonate, etc or their mixture.

The invention relates to a method for producing low polymerization degree polyvinyl alcohol including: mixing the monomer vinyl acetate with solvent carbinol in a mass ratio of 60-80:20, adding ignition primer diisopropyl azodicarboxylate taking 0.1-0.5% of the monomer mass and chain transfer agent 2-mercaptoethanol taking 0.1-0.5% of the monomer mass, producing low polymerization degree polyvinyl acetate by solution polymerization method; dissolving the low polymerization degree polyvinyl acetate in the carbinol to get polyvinyl acetate carbinol solution, adding NaOH carbinol solution, alcoholysis to get low polymerization degree polyvinyl alcohol. The inventive method can produce low polymerization degree polyvinyl alcohol with a low polymerization degree of 50-500.

The invention provides a high-altitude long-span overhung cornice formwork supporting system. The system comprises an overhung I-shaped steel beam, an overhung I-shaped steel beam fixing hoop, an anchoring ring, a steel wire rope inhaul cable, an operating platform, an overhung structure load-bearing frame, an outer protecting scaffold, a cornice supporting formwork and a secondary unloading assembly, wherein a pull ring, a vertical rod inserting-connection positioning part and steel angles are arranged on the overhung I-shaped steel beam, one end E of the overhung I-shaped steel beam is fixed to an architectural structure plane through the overhung I-shaped steel beam fixing hoop, the other end of the overhung I-shaped steel beam is tensioned with the steel wire rope inhaul cable, the secondary unloading assembly comprises an inclined-supporting steel tube and a pre-buried supporting point steel tube, and the secondary unloading assembly is used for performing secondary unloading on a cornice supporting formwork system. A constructing method of the high-altitude long-span overhung cornice formwork supporting system includes the steps of manufacturing the overhung I-shaped steel beam, arranging the pre-buried part, installing the overhung I-shaped steel beam, setting up the operating platform, the overhung structure load-bearing frame, the outer protecting scaffold and the cornice supporting formwork, installing the inclined-supporting steel tube and the like. The high-altitude long-span overhung cornice formwork supporting system is easy to construct and operate and convenient to detach, the construction period is shortened, and cost is saved.

A process for preparing zinc oxide nanotubes by hydrothermal decomposing and growth includes such steps as dripping concentrated ammonia water in the solution of zinc chloride while stirring, regulating pH=9-11, sealing, ultrasonic treating, putting a clean and electrically conductive substrate in the solution, sealing again, laying a side at 80-98 deg.C, natural cooling, ageing, taking the substrate, flushing with deionized water, and natural drying to obtain the zinc oxide nanotubes on the surface of substrate.

The present invention relates to one kind of chewing tablet of proton pump inhibitor for treating gastric ulcer, duodenal ulcer, stomal ulcer and other indications. The chewing tablet contains proton pump inhibitor in 1-5 wt%, carbonate in 35-60 wt% and hydroxide in 35-60 wt%. The proton pump inhibitor is one selected from omeprazole, S-omeprazole, pantoprazole, lansoprazole, rabeprazole, leminoprazole, tenatoprazole and their salts. The biologically acceptable buffering agent is selected from sodium bicarbonate, sodium carbonate, magnesium carbonate, calcium carbonate and their mixture, preferably sodium bicarbonate. The hydroxide is selected from magnesium hydroxide, calcium hydroxide, aluminum hydroxide, sodium hydroxide and their mixture, preferably magnesium hydroxide.

The invention relates to a mobile house. The house is a cabinet body; each side surface of the mobile house consists of a plurality of plate surface modules; each plate surface module comprises an outer sealing plate and an inner sealing plate in parallel arrangement; the two adjacent plate surface modules are fixed through a connecting post or an edge corner upright post; the mobile house also comprises an upper framework and a lower framework; the connecting post or the edge corer posts of the four side surfaces of the mobile house are fixed between the upper framework and the lower framework; the connecting posts positioned at the top surface of the mobile house are fixed on the upper framework; and the connecting posts positioned at the bottom surface of the mobile house are fixed on the lower framework. Compared with the prior art, the mobile house is formed through modular assembly; the dismounting and the moving can be realized through modularization; the mode of breaking up the whole into parts is adopted, so that small parts can be produced by precise metal plate processes; the precision and the anticorrosion performance are greatly improved through being compared with those of a container; and meanwhile, the appearance can be attractive.

The invention discloses a method for recycling titanium, silicon, aluminum, calcium and magnesium from titaniferous blast furnace slag by multistage acid leaching. The titaniferous blast furnace slag is especially titaniferous blast furnace slag obtained by carrying out iron making on vanadium titanomagnetite in Panzhihua regions. The method comprises the following steps: carrying out acid leaching (especially multistage acid leaching) on furnace slag to obtain an acid leaching solution and white carbon black; and carrying out an extraction technique on the acid leaching solution to obtain titanium, aluminum, calcium, magnesium, manganese, iron, chromium, vanadium and other useful metals. On the premise of recycling resources, the method implements cyclic utilization of waste (using waste of one technique as a raw material of another technique), eliminates waste discharge, obviously lowers the cost and enhances the recycling efficiency.

The invention relates to a method for preparing nano-silver powders or nano-gold powders. In a single cell, metallic silver or an gold electrode is processed through anodic oxidation, inert conducting material is used as a cathode, room-temperature ionic liquid containing silver salt or gold salt is used as electrolysing solution, the electrolysis is executed under direct current, and the nano-silver powders or the nano-gold powders are obtained around the cathode; wherein, the silver salt is AgBF4; the gold salt is Au (PPh3) Cl or Au (PPh3) Br; the room-temperature ionic liquid is one of [bmim]BF4, [bmim]PF6, [emim]BF4, and [hmim]BF4. In the method, the metallic silver or gold is used as a sacrificial anode, the nano-silver powders and the nano-gold powders can be produced directly through electrolysis, the technology is simple, the cost is low, and the method is suitable for industrialized production. The room-temperature ionic liquid is used as an electrolytic dissolvent, the ionic liquid performs a role of not only a dissolvent but also a dispersant and a stabilizing agent, and nano-metal is easy to obtain, compared with water solution; compared with organic solvent, the room-temperature ionic liquid is safer and more environment-protecting.

The invention discloses a supramolecular multi-copolymer type clean fracturing fluid. The supramolecular multi-copolymer type clean fracturing fluid comprises the following components in percentage by mass: 0.3-1.0% of supramolecular active polymer, 0.3-1.0% of cross-linking agent, 1-2% of KCL and 96-98% of water, wherein the molecular formula of the supramolecular active polymer is shown in the specification, R is C13-C21 straight chain or branched chain alkyl, n is an integer of 3-6 and p is an integer of 2-4. The fracturing fluid disclosed by the invention has the characteristics of high-temperature resistance, safety and environmental friendliness.

The invention discloses a method for preparing a bisphenol compound antioxidant product by using an organic acid catalyst. A closed reactor is adopted, water is used as reaction solvent, a liquid organic acid catalyst is selected as a catalyst, and the bisphenol compound antioxidant product is generated through the condensation reaction of dialkyl phenol and aliphatic aldehyde. The liquid organicacid catalyst is one or a mixture of more of long-chain alkyl benzene sulfonic acid, long-chain dialkyl benzene sulfonic acid, long-chain alkyl diphenyl ether disulfonic acid and long-chain dialkyl diphenyl ether disulfonic acid and aliphatic hydrocarbon of C6 to C10 or aromatic hydrocarbon of C6 to C8 in a mass ratio of 1: 0.1-1.0. The dosage of the liquid organic acid catalyst is 7 to 30 percent by mass of dialkyl phenol; the mass ratio of the water to the dialkyl phenol is 2-5:1; and the molar ratio of the aliphatic aldehyde to the dialkyl phenol is 0.45-0.60: 1. The reaction pressure is 0to 0.1MPa, the reaction temperature is 60 to 95 DEG C, and the reaction time is 4 to 7 hours. The raw material variety used by the method is reduced, and the production efficiency is improved; and the method avoids using sulfuric acid and hydrochloric acid with stronger corrosion on the equipment.

The invention relates to a grinding wheel dressing device for a worm grinding-wheel gear grinding machine, which comprises first, second and third brackets, first and second high-speed motors, coarse and fine dressing diamond wheels, a worm grinding wheel, a worm grinding wheel installation seat, a driving servo motor, a grinding wheel installation shaft, a longitudinal servo motor, a longitudinal lead screw pair, a transverse lead screw pair and a transverse servo motor. The worm grinding wheel installation seat is fixed on a base; the worm grinding wheel is arranged at the inner end of the grinding wheel installation shaft; the grinding wheel installation shaft is sleeved in a bearing hole in the worm grinding wheel installation seat; the driving servo motor is arranged at the outer end of the grinding wheel installation shaft; the first bracket is arranged on the second bracket by the longitudinal lead screw pair; the second bracket is arranged on the third bracket by the transverse lead screw pair; one ends of lead screws of the transverse lead screw pair are connected with the transverse servo motor; one ends of lead screws of the longitudinal lead screw pair are connected with the longitudinal servo motor; and the first high-speed motor with the coarse dressing diamond wheel and the second high-speed motor with the fine dressing diamond wheel are respectively arranged at both sides of the first bracket.

The invention discloses an LED plant-growth lamp with a continuous spectrum. The LED plant-growth lamp comprises an LED light source lamp bead group (namely a light source), a light source base board, a radiator and a driving power source matched with the light source, wherein the LED light source lamp bead group consists of warm white light LEDs and red light LEDs. The correlated color temperature of the warm white light LEDs is below 4000K, and each warm white light LED is formed by applying fluorescent powder on a blue light chip of which the wave length of emitted light is 420-490nm; the fluorescent powder is a mixture of YAG fluorescent powder which emits yellow light at peak and fluorescent powder which emits green light at peak wavelength; the green-light fluorescent powder accounts for 5%-30% of the total weight of the fluorescent powder; the wave length of the red light LEDs is within the range of 620-680nm. The LED plant-growth lamp disclosed by the invention has the technical effects that the wave length of light is within the range of 430-680nm, and the lamp has the continuous spectrum so that the requirements of plants for light with other wave lengths can be met; the light supplementing effect is good; the growth quality of plants is high. The LED plant-growth lamp saves energy and is low in production cost.

The invention relates to a method for preparing foamed ceramics based on nano-alumina, which comprises the following steps of: mixing nano-alumina particles, de-ionized water and short-chain amphipathic organic molecular solution, placing the mixture into a mill pot and grinding and stirring the mixture to form suspension with stable particles; taking the suspension out, adding a water insoluble organic solvent like a hydrocarbon material in a certain proportion into the suspension and completely stirring the mixture to form micro-emulsion with an oil-in-water structure; injecting the micro-emulsion into a prepared stainless steel mould and drying the micro-emulsion for 10 to 15 days to form a foamed sample; and sintering the foamed sample in a sintering furnace of 650 to 900 DEG C for 2 to 8 hours to mold the foamed sample, taking the molded foamed sample out of the stainless steel mould, and placing the molded foamed sample into a high-temperature sintering furnace of 1,350 to 1,600 DEG C for sintering for 2 to 8 hours to obtain the high-strength nano-alumina foamed ceramics. The method of the invention has the advantages of simple equipment and process, low energy consumption, raw materials which are large-scale industrial products and easy realization of large-scale industrial production. The product not only has the high-strength characteristic of fireproof bricks, but also has the advantages of the light weight and heat preservation of ceramic fibers.

The invention provides a glued board aldehydeless starch gum and a preparation method. The starch gum of the invention is made of the material components with the weight portions of 100 portions of starch, 0.4-1.2 portions of alkali, 1-3 portions of oxidant, 0.5-1 portions of initiator, 8-20 portions of grafting agent and 0.2-0.5 portions of preservative. In the preparation method, starch suspension liquid is obtained; alkali is added for activating the suspension liquid; pH value is adjusted; oxidizer is selected for oxidizing the activated starch suspension liquid; the initiator is introduced; polymer monomeric compound is adopted for grafting. The product of the invention has the advantages of nontoxic and harmless performance, low price, biodegradable performance and environmental protection. With good adhesion property, the glued board aldehydeless starch gum is especially applied to press poplar glued boards and laminated veneer lumbers. The adhesion strength accords with the national standard requirement. Belonging to the aldehydeless environmental protection adhesive, the glued board aldehydeless starch gum can play a positive role in promoting the industrialized and development of abundant poplar fast growing areas (such as northern Jiangsu).

A process for purifying polyether sulfone includes such steps as loading polyether sulfone in reactor, proportionally adding deionized water and surfactant, heating while stirring for at least 3 hr, cooling, filtering, washing with boiling deionized water several times, filtering, and drying.

A door closer is described, which has an output shaft, on which a cam disc is torsion-resistantly disposed, and has a pressure roller. By means of an operational connection, a closer spring presses the pressure roller against a running surface of the cam disc. In relation to an axial center of the output shaft, the pressure roller is disposed such that, during opening or closing of a swing leaf coupled to the output shaft, the pressure roller is movable along a path. Due to the fact that the path bypasses the axial center of the output shaft and on account of the configuration of the running surface of the cam disc, at a respective opening angle of the swing leaf, in different modes of operation of the door closer, a very similar or identical torque is respectively applied to the output shaft.

The invention belongs to the technical field of coatings, and particularly relates to an environment-friendly type building exterior wall coating material which is characterized by comprising titanium dioxide, talcum powder, calcium carbonate, mica powder, 2wt% of cellulose thickening agent solution, 10wt% of polyphosphate dispersing agent solution, 50wt% of polyacrylic acid emulsion, a mildew preventive, a defoaming agent, propylene glycol, ethylene glycol and purified water. The environment-friendly type building exterior wall coating material is prepared by adopting the steps of weighing raw materials, grinding granular raw materials, dissolving and filtering. The environment-friendly type building exterior wall coating material has the beneficial effects of no pollution, simple preparation method, less required devices, short curing time, low requirement on a coated environment condition, excellent mildew preventing effect, and the like.

The invention discloses a method for measuring seawater chemical oxygen demand by photometry, wherein the seawater exemplar is first pre-processed, then using the basic potassium hypermanganate as reaction system, the potassium permanganate is deacidized quantitatively by organics to produce manganate, using pure water or margin solution as reference ratio, measuring the absorbance an of the manganate at its maximum absorbing wave length 430 nm, drafting the A-COD value operating curve, obtaining the concentration of the organics in the water, i.e. seawater COD value based on the photometric quantity of the operating curve. The method is easy and simple to operate and can reduce the environmental pollution, it is easy to accomplish the automation of the seawater COD measurement.

The invention relates to a flax-wool blended yarn bleaching process. The weight percentage of flax in blended yarns is 50-90 percent and the weight percentage of wool in the blended yarns is 10-50 percent. The flax-wool blended yarn bleaching process is characterized in that the process sequentially comprises the steps of acid washing, water washing, two times of oxygen bleaching and final water washing, mixed solution which contains 2g / L hydrogen peroxide, 0.7g / L non-ionic penetrating agent, 4g / L sodium silicate, 1g / L oxygen bleaching stabilizer and 0.6g / L chelating dispersant is used in the oxygen bleaching process, the pH (potential of hydrogen) value of the mixed solution is adjusted to 8-9 by using 2g / L sodium carbonate solution, treatment is conducted for 1-2 hours at 70-75DEG C, and then bleaching is conducted for another time according to the same formula. The flax-wool blended yarn bleaching process has the advantages that not only can the flax fibers be well bleached, but also the wool fibers are not damaged, the processing flow is shortened and the energy is saved.

The invention provides a method for preparing nanometer cerium oxide. The invention adopts the following technical scheme that the method comprises the following steps: 1) preparing a Ce(NO3)3.6H2O aqueous solution with a concentration of 0.05-0.1 mol / L at room temperature; 2) taking a certain volume of the Ce(NO3)3.6H2O aqueous solution at room temperature, dropwisely adding undiluted commercially-available 25% ammonia water into the Ce(NO3)3.6H2O aqueous solution according to a volume ratio of 10:1-3; 3) allowing the mixed solution to react for 2-24 hours, after the reaction, performing centrifugation, removing the liquid at the upper level, washing the powder obtained after centrifugation, and drying to obtain solid powder. The invention realizes one-step synthesis of nanometer cerium oxide by a hydrothermal method; the preparation process is simple, and the requirements for production equipment and process conditions are low; no organic solvent is added, which is basically free of pollution, and is quite environment-friendly; no macromolecular surfactant is added, which prevents posttreatment process such as washing and the like; the kinds of the required raw materials are few, and when compared with traditional process, the method of the invention is quite low in production cost; the method cam prepare uniform and pure cerium oxide nanoparticles, cerium oxide nanorods, and mixtures of the above two.

The invention discloses a small-module straight bevel gear forming method numerical control machining process. The small-module straight bevel gear forming method numerical control machining process comprises the following steps of gear parameter design calculation, machining cutting tool parameter design calculation, program scheduling and machine tool machining. According to the small-module straight bevel gear forming method numerical control machining process, a tooth profile angle of a large end and a tooth profile angle of a small end are continuously modified through the angular displacement of a C axis of a numerical control gear hobbing machine and the axial displacement of a Y axis of the numerical control gear hobbing machine to obtain the tooth profile which is approximate to the spherical involute. The small-module straight bevel gear forming method numerical control machining process is less in cutting tool change type, high in machining efficiency and suitable for small batch production and mass production.

The invention discloses a preparation method of spherical nanometer CeO2 polishing powder and belongs to the field of nanometer material research. The preparation method utilizes a crystal water-containing cerium salt and citric acid as raw materials, a proper amount of ethanol as a lubricant and the ball milling mechanical force to refine the raw materials so that reaction efficiency is improved. Crystal water released by the raw materials and the lubricant ethanol form a liquid film and precursor gel is directly prepared so that a ball milling solid-phase chemical reaction method and a sol-gel method are combined. The gel can effectively inhibit the agglomeration and growth of cerium oxide particles in later calcination processes so that the pherical nanometer CeO2 polishing powder with uniform particle sizes, good dispersibility and good polishability are prepared. The pherical nanometer CeO2 polishing powder has uniform particle sizes, good dispersibility and good polishability. The preparation method has the advantages of simple processes, high efficiency, no pollution and good reproducibility, and is suitable for industrial mass production.

The invention discloses a vending machine based on data mining commodity stock and dynamic pricing. The vending machine comprises a beverage cabinet which is provided with a self-service beverage blending area and a finished beverage product area, the self-service beverage blending area is provided with a beverage outlet head, an infrared sensor, a payment device, a cooling and exhaust window, a monitoring system is arranged on the beverage cabinet, the finished beverage product area is provided with a display screen and a beverage outlet area, and a chain drive warehouse, a discharging warehouse, a raw material barrel, a currency storage cabinet, a control system box and a refrigerating system are arranged at the back of the beverage cabinet. Accordingly, a circular closed chain drive warehouse is adopted for containing beverages, more varieties and a large number of the beverages are contained, tastes and formulas of the beverages can be understood, the varieties and the number of the beverages on the shelves are determined automatically through a data miner and a database, data of the data miner and data of the internet are received through a pricing device, the phenomenon that the price affects beverage sales is avoided, and by integrating the vending machine and a beverage blending device into a whole, the consumer demands of different consumers are met.