35results about How to "Difficult to convert" patented technology

The invention provides a phononic crystal theory-based method for determining a cutter bar structure of an ultrasound knife. The method comprises the following steps of setting the cutter bar structure of the ultrasound knife to be a periodic repetition structure with a variable cross section; configuring the periodic repetition structure into a phononic crystal structure with a variable cross section; forming an energy band structure when an ultrasonic wave is transmitted in phononic crystal of the periodic structure, calculating the energy band structure of the phononic crystal structure with the variable cross section according to a phononic crystal band-gap characteristics calculation method and determining pass band and stop band ranges of longitudinal vibration and bending vibration in the energy band structure; determining the cutter bar structure of the ultrasound knife in pure longitudinal vibration, adjusting the set periodic repetition structure until the working frequency of the ultrasound knife is in the pass band range of the longitudinal vibration and the stop band range of the bending vibration. The periodic structure is introduced into a cutter bar, and the cutter bar structure is adjusted by employing a phononic crystal theory until the working frequency is limited near a pure longitudinal vibration mode, so that the cutter bar structure design of the ultrasound knife in pure longitudinal vibration is achieved.

For creeping stems of lawn grass, one or two buds at the front end of the near growth point can sprout, a plurality of buds at the back end are dormant, only one or two buds at each end of the grass item can sprout, a plurality of buds and internodes become the growth substrate for the sprouting buds at the front end, and the stems and leaves trimmed off can be directly used as the growth substrate of the lawn grass. According to the principle, the invention discloses a method for culturing soil-free lawn in a substrate-free mode. The technical scheme comprises selection of grass seeds, collection of items, paving of an insulating layer, sowing of grass items, water management, nutrient management, lawn trimming, prevention and controlling of diseases, insects and natural grass. The method can save the special lawn-culturing substrate, has the advantages of energy conservation and low carbon, rain wash resistance, quick lawn formation, smooth and dense lawn, strong root system, no soil pollution and short rejuvenation period, and is in accordance with the development trend that the quality requirements of lawn in various urban sightseeing greenbelts and playgrounds are higher and higher.

The invention discloses an alprostadil emulsion determination method used for determining the content of active ingredients alprostadil and impurities prostaglandin A₁. The invention carries on the emulsion breaking by utilizing the alcohol mixed organic solvent, then determines the content of alprostadil and prostaglandin A₁ by using a high performance liquid chromatography. The method is simple, convenient, easy operation, breaking completely, and effectively controls the quality of products. Compared with the prior art, the method is more economical, quick, accurate and easy operation. Therefore the invention can be used for determining the alprostadil emulsion quality, also detecting the intermediates in the production process.

The magnitude of asphaltic precipitation when injecting a viscosity reducing diluent into a reservoir formation, notably to assist oil recovery therefrom, is forecast by (i) determining a relationship between asphaltic precipitation and a solubility parameter for the diluted oil, and then (ii) utilizing that relationship to forecast the magnitude of asphaltic precipitation when injecting a predetermined viscosity reducing diluent into the formation. Making this forecast may be followed by injecting a viscosity reducing diluent into the formation to assist oil recovery. The diluent may in particular be supercritical carbon dioxide or other asphaltene precipitant mixed with a more polar material in proportions designed by forecasting asphaltic precipitation by candidate materials in possible proportions.

The invention relates to a preparation method of graphene toughened silicon carbide ceramic. The preparation method comprises the following steps: (A) mixing silicon carbide powder, graphene powder, asintering aid and a solvent, and crushing to prepare silicon carbide slurry; (B) drying, crushing and sieving the silicon carbide slurry to prepare uniformly mixed composite powder; (C) putting the composite powder into a mold, and applying one-way pressure to obtain a composite powder compact; and (D) putting the mold filled with the composite powder compact into a sintering furnace, heating thefurnace to a temperature T1 in a vacuum environment, and carrying out a heating pressurization-cooling pressureless cyclic sintering process to prepare the graphene toughened silicon carbide ceramic.According to the method, the problems of high sintering temperature, low densification speed and low density in the prior art are effectively solved by utilizing a high-temperature pressurization-low-temperature non-pressure vacuum circulating sintering technology, and the graphene toughened silicon carbide ceramic with higher density is quickly obtained at a lower temperature.

The invention relates to a soil fertilizer synergist, in particular to a nitrogen synergist applied to protected horticultural vegetable fields and a preparation method thereof. The components by weight percentage are 10-30% of calcium cyanamide, 30-50% of zeolite powder and 30-50% of lignite. The preparation method comprises the following steps: the 10-30% of calcium cyanamide and the 30-50% of zeolite powder are mechanically and evenly mixed to obtain a mixture, and then the mixture is added with the 30-50% of lignite and mechanically mixed evenly, thus obtaining the nitrogen synergist. The preparation method is simple and pollution-free, and the nitrogen synergist is an organic and inorganic combined nitrogen synergist which has the effects of combining the slow release and quick release of nutrients, slowly releasing fertilizer nutrients, improving the utilization rate of the fertilizer, reducing the amount of chemical fertilizers used, improving the physical and chemical properties of soil and improving the productivity of the soil.

The invention relates to a special-purpose rape fertilizer for preventing clubroots. The special-purpose rape fertilizer for preventing the clubroots is characterized by comprising urea, diammonium hydrogen phosphate, potassium chloride, ammonium chloride, coating lime nitrogen and boron particles, wherein the raw materials with percentage by weight comprise the urea 22.5-27.5%, the diammonium hydrogen phosphate 15.0-20.0%, the potassium chloride 18.0-22.0%, the coating lime nitrogen 28.0-33.0% and the boron particles 0.7-0.9%. The special-purpose rape fertilizer for preventing the clubroots can improve soil environment, reduces rape clubroots to happen, improves yield of rapes, and is low in production cost and convenient to apply.

The invention provides a process for synthesizing biurea by adopting semicarbazide. The process comprises the following steps: a, using semicarbazide and cyanate as raw materials, weighing solid according to the molar ratio of semicarbazide to cyanic acid radicals of 1: (1.01 to 1.05) and adding water; b, keeping the temperature of the mixed solution in a range of 0 to 80 DEG C; c, preparing an acid solution according to the molar ratio of the cyanic acid radical to H+ being 1: (1.01 to 1.05); d, dropwise adding the acid solution into the mixed solution while stirring, and finishing the reaction; and e, filtering, washing and drying. The process has the beneficial effects that firstly, a low temperature is adopted in the reaction, the semicarbazide is stable in property, is difficult to volatilize and is difficult to convert into other substances, the conversion rate is very high, and the yield of 100% can be reached; secondly, a reaction byproduct is sodium salt, has no pollution to the environment, and can be discharged without being post-processed; thirdly, the reaction is performed under a normal pressure and is easy to operate; and fourthly, the acidity is low in the reaction and the equipment is corroded a little.

The invention discloses a preparing method and application of an A-site compound ion perovskite type ferroelectric fuel ceramic nano-powder material. The method includes the steps of dissolving sodiumhydroxide in deionized water to obtain a solution A after cooling; adding a titanium source, a bismuth source and a lithium source to the solution A to be sufficiently mixed and evenly dissolved in the solution, transferring the even-mixed solution to a reaction still, sealing the reaction still and putting the reaction still into an oven for reaction to obtain doped sodium bismuth titanate powder through the reaction, conducting standing on the doped sodium bismuth titanate powder, conducting centrifuging until the powder reaches the neutral state to obtain powder, and drying the powder in the oven to prepare the A-bit compound ion perovskite type ferroelectric fuel ceramic nano-powder material. The material is low in cost and simple in preparing process, and the crystal phase transition, decomposition, volatilization and other defects of the high-temperature preparing technology are overcome through a simple hydrothermal synthesis method.

The invention provides a method for preparing high-purity alpha-silicon nitride powder and high-purity alpha-silicon nitride powder. The method comprises the steps that: a catalyst is added into fine silicon powder with the particle size being 100 micrometers or below, and the catalyst can generate a metal compound through a reversible reaction under the reaction condition for preparing the silicon nitride powder, and a metal halide can exist; and the fine silicon powder added with the catalyst is putted into a nitriding furnace, and heat preservation is carried out for 50-180 hours at the temperature of 1050-1400 DEG C in a mixed atmosphere of nitrogen and argon so as to carry out nitriding reaction to obtain the silicon nitride powder. According to the method disclosed by the invention, through the special effects that the catalyst for forming the volatile metal halide through the reversible reaction is transported back and forth among the surfaces of the powder particles, repeatedly plays a catalytic role at a plurality of sites and fully catalyzes the surface reaction with fewer metal impurities, so that the purity of the product is guaranteed, and the alpha-phase content of the product is increased, and the requirements of high-purity silicon nitride powder are met.

The invention provides a white-light OLED (organic light emission diode) device. The device comprises a glass substrate as well as a first red light color conversion layer, a transparent anode, a hole-transmission layer, a blue light emitting layer, an electronic transmission layer, a cathode and a second red light color conversion layer which are stacked sequentially, wherein the materials of both the first red light color conversion layer and the second red light color conversion layer comprise red light fluorescent materials and red light host materials whose mass ratio is (1-10) :100, and the light absorption wavelength peak of the red light fluorescent materials ranges from 460 nm to 470 nm; the materials of the blue light emitting layer comprise a blue light fluorescent material and a blue light host material whose mass ratio is (1-10) :100, and the light absorption wavelength peak of the blue light fluorescent material ranges from 460 nm to 470 nm; the material of the transparent anode adopts metal gold or silver. The white-light OLED device can realize emission of white light with stable light color. The invention further provides a preparation method of the white-light OLED device.

A voice processing apparatus includes: an error detector which detects an error in a frame containing voice data; a correction value calculator which determines a level of the error detected by the error detector and calculates a correction value according to the level; and a voice data corrector which corrects the voice data by using the correction value calculated by the correction value calculator.

The invention discloses a hydrogen-oxygen mixed gas generating device. The hydrogen-oxygen mixed gas generating device comprises a box and a gas generating system arranged in the box. The gas generating system comprises a water tank and a plurality of electrode plates arranged attached to one side face of the water tank. An insulator is arranged between every two electrode plates, and one side face of the water tank and the electrode plates are each provided with at least one gas circulating hole and at least one liquid circulating hole. The gas circulating holes of every two electrode platesare formed in a staggered manner, and the liquid circulating holes of every two adjacent electrode plates are formed in a staggered manner. The liquid circulating holes communicate with the water tankand the electrode plates to form electrolyte channels, and the gas circulating holes communicate with the water tank and the electrode plates to form oxygen channels. According to the hydrogen-oxygenmixed gas generating device, the combustion speed of fossil fuel can be increased, combustion of the fossil fuel is helped, and the emissions of nitric oxide, carbon dioxide and the like during combustion are effectively reduced.

The invention relates to a production method of sugar cane sulfur-free white granulated sugar, which comprises the following steps: carrying out preliming, primary liming, primary carbonation, secondary carbonation, full juice filtration, neutralization and clarification, floating syrup to remove impurities and color to obtain refined syrup, and boiling the refined syrup to prepare the sugar cane sulfur-free white granulated sugar. A two-carbon carbonation and syrup floating combined process is adopted, a stoving process of a traditional process is completely replaced, the clarification effect of cane juice is improved through a gradual liming process of preliming and main liming, the color value and turbidity index of the product are superior to those of a product prepared by a traditional sulfurous acid method and a carbonic acid method, the product is completely sulfur-free, and the product quality is high. The quality and the safety are obviously improved.

The invention provides a nano-micelle tanning agent, a preparation method of the nano-micelle tanning agent, and application of the nano-micelle tanning agent in tanning leather. The nano-micelle tanning agent is of a core-shell nano-micelle structure which is formed in water through self-assembling with the adoption of methoxypolyethylene glycol polyacrylate-multicomponent acrylic copolymer and common inorganic metal ions in the tanning leather and uses the copolymer as a shell and the metal ions as a core. By means of the core-shell structure, trivalent chromium can be effectively protectedand prevented from being converted into hexavalent chromium; the nano-micelle tanning agent can be applied to tanning without pickling, salt-less pickling tanning and traditional pickling tanning andcan break the limit of the chemical equilibrium during tanning combination, the metal ions can be subjected to coordination complexation together with a skin collagen carboxyl group and a polymer carboxyl group, uniform tanning is achieved, meanwhile the absorbing utilization ratio of the metal ions is increased, and heavy metal discharging pollution and neural salt pollution are reduced. Furthermore, the fullness and physical and mechanical properties of finished leather can be improved, and the retanning effect is achieved, and the main tanning and retanning integration of the tanning leather process is achieved.

The invention provides a preparation method of freeze-dried fruits of trichotomous evodia and a product thereof, and belongs to the technical field of traditional Chinese medicinal material processing. The preparation method of the freeze-dried fruits of trichotomous evodia comprises the following steps: taking fruits of trichotomous evodia as a raw materials; removing kernels; and carrying out freezing, vacuum drying, vacuum drying and the like. The preparation method of the freeze-dried fruits of trichotomous evodia provided by the invention is high in production efficiency, short in total processing time, low in temperature, low in energy consumption, reduced in production cost, and improved in production efficiency. The freeze-dried product prepared by the preparation method provided by the invention is bright in color, low in water content, not serious in adhesion condition, and high in product extract and nutrient content.

The invention discloses a preparation method of a mesoporous TiO2 whisker, a distillate oil hydrodesulfurization catalyst and a preparation method of the distillate oil hydrodesulfurization catalyst.The preparation method of the mesoporous TiO2 whisker comprises the following steps: 1, dropwise adding water into potassium dititanate, performing stirring, and performing sealed standing for 3-15 days; 2, dispersing the solid after standing into water in a solid-liquid ratio of (1:100)-(1:500), dropwise adding hydrochloric acid, adjusting the pH value to 1-10, performing stirring for 18-48 hours, and performing a first ion exchange reaction; 3, performing sedimentation and suction filtration on an emulsion obtained after the ion exchange reaction, and washing and drying the obtained precipitate so as to obtain dititanic acid; and 4, immersing the obtained dititanic acid into a KOH (potassium hydroxide) aqueous solution, performing a second ion exchange reaction, allowing the obtained reaction product to stand for 2-24 hours, and performing filtering and drying, so as to obtain the mesoporous TiO2 whisker. A mesoporous TiO2 whisker/gamma-Al2O3 composite material is adopted as a substrate to support active components to prepare the distillate oil hydrodesulfurization catalyst. The catalyst disclosed by the invention is high in reaction activity, sulfur in diesel fuel of which the content of sulfur is 5000ppm can be reduced to 10ppm or lower, and the sulfur content of a product meets European VI diesel oil standards.

The invention provides a method for preparing p-aminobenzoic acid by waste polystyrene. The method comprises the following steps: putting the waste polystyrene crushed simply into a microwave reactor, adding a nitrifying oxidant and a catalyst I, reacting in microwave, and then cooling the reaction liquid to room temperature, separating out p-nitrobenzene formic acid, and filtering the acid after washing the acid; dissolving the p-nitrobenzene formic acid in an alkali liquor, and putting the microwave reactor again, adding a catalyst II, and introducing hydrogen; and after reacting in microwave, cleaning, crystallizing and drying, obtaining the p-aminobenzoic acid. The method changes the waste polystyrene into valuable for raw materials, and overcomes the defects of multi-step operation of the prior method, low yield and low purity. The method improves the purity and the yield of the p-aminobenzoic acid prepared by a microwave method remarkably compared with the prior method, has high production efficiency, and has excellent application prospect in industry.