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62 results about "Residual nitrogen" patented technology
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Residual Nitrogen. The term residual nitrogen designates the nitrogen which can still be released into your body tissue even many hours after a dive. The procedure is also known as decompression. As a rule, this residual nitrogen is not dangerous and needs up to 24 hours before it is completely dissolved.
Removal of Hg, NOx, and SOx with using oxidants and staged gas/liquid contact
InactiveUS20050214187A1Simple methodHigh removal rateGas treatmentNitrogen compoundsNitrogen oxidesSorbent
A method of scrubbing mercury compounds and nitrogen oxides from a gas stream employing a scrubbing operation. The method involves the contact of the stream which contains mercury, SOx and NOx compounds with a sorbent to remove at least a portion of the latter compounds. This results in a partially cleaned stream. The method further involves contacting the latter stream with an oxidant to oxidize and remove substantially all residual nitrogen oxides, mercury and mercury compounds remaining in the stream.
Owner:AIRBORNE IND MINERALS INC CA
Multi-bed selective catalytic reduction system and method for reducing nitrogen oxides emissions
InactiveUS20080131345A1Reduce concentrationCombination devicesNitrogen compoundsHydrogenNitrogen oxide
Systems and methods of removing at least nitrogen oxides from an exhaust fluid generally include introducing a first reducing agent and a hydrogen gas co-reductant agent into the exhaust fluid upstream of a catalyst bed optimized for a hydrocarbon selective catalytic reduction process to reduce nitrogen oxides present in the exhaust fluid and then reacting residual nitrogen oxides in a second catalytic bed optimized for an ammonia selective catalytic reduction process. The use of hydrogen gas permits efficient reduction of nitrogen oxides over a wide temperature range, which is minimally affected by the presence of sulfur dioxide in the exhaust fluid.
Owner:GENERAL ELECTRIC CO
Processing method of chemical nickel phosphor plating
InactiveCN101434441AShort processEasy to handleWaste water treatment from metallurgical processWater/sewage treatmentLiquid wasteChemical plating
The invention discloses a treatment method of chemical nickel phosphor plating waste liquid, and relates to the comprehensive recovery and utilization field of chemical plating waste liquid. Under the condition of not adding any catalysts such as Pt salt and the like, and without external heating, the method utilizes sodium hydroxide dissolution, heat produced in the process of neutralization reaction and local high temperatures between liquid-solid interfaces, high pH value, and NaOH, and is induced by crystal nucleus provided by Ni2, therefore, the waste liquid is impelled to carry out self decomposition, and Ni-P alloy solid particles are generated. Under the action of the self decomposition of the Ni-P alloy solid particles, the waster liquid is decomposed quickly and completely, nickel is transformed into Ni-P alloy and then settled and separated out. More than 96 percent of nitrogen is transformed into ammonia, and phosphor, residual nitrogen, and majorities of organic acid are transformed into magnesium salt and calcium salt compound fertilizer. After the recycled nickel and phosphor resources are subjected to comprehensive recovery treatment, the nickel and the nitrogen contained in the waste liquid reach the national first-level discharge standard, and the phosphor and COD reach the national third-level discharge standard.
Owner:SHANDONG JIANZHU UNIV
Removal of Hg, NOx, and SOx with using oxidants and staged gas/liquid contact
A method of scrubbing mercury compounds and nitrogen oxides from a gas stream employing a scrubbing operation. The method involves the contact of the stream which contains mercury, SOx and NOx compounds with a sorbent to remove at least a portion of the latter compounds. This results in a partially cleaned stream. The method further involves contacting the latter stream with an oxidant to oxidize and remove substantially all residual nitrogen oxides, mercury and mercury compounds remaining in the stream.
Owner:AIRBORNE IND MINERALS INC CA
Personal respirator
This Personal Respirator is a respiratory protection air-purifying device that minimizes the area required in front of the face, especially around the mouth area, by locating the very lightweight filter and plenum close to the head, connected by a airway tube forming a complete unit with the mouthpiece in the mouth, supported by the mouth. The airway tube and the filter plenum are both of minimal internal area and close to the mouthpiece, thus minimizing the internal volume of used air, residual nitrogen, and making the outside dimensions small enough to be compatible with most safety equipment. The respirator requires no straps and is preferably provided with a small tether to the nose clip and is worn in front of the head with the mouthpiece inserted into the mouth, the filter then supported by the mouth, and the nose clip secured on the nose.
Owner:DUXBURY JAMES N
Method for recycling mother liquor during production of iron phosphate
ActiveCN107445139AReduce manufacturing costAvoid wastingPhosphorus compoundsPhosphatePhosphoric acid
The invention discloses a method for recycling a mother liquor during the production of iron phosphate. The method comprises the following steps: firstly, adding iron phosphate reaction raw material liquid and H2O2 into a reaction kettle to synthesize iron phosphate; performing synthesis reaction and slurry pressing and filtration to obtain slurry and mother liquor of iron phosphate; then recovering phosphorus and ammonium in the mother liquor in the form of iron phosphate filter cakes and monoammonium phosphate solution, respectively; reusing all the recovered materials in an iron phosphate synthesizing step. The method provided by the invention regenerates and recycles the mother liquor generated during the preparation of iron phosphate, can make full use of residual nitrogen, phosphorus and other useful components in the mother liquor, avoids waste of resources, and greatly reduces comprehensives cost and matched environmental protection costs for the production of iron phosphate.
Owner:CENT SOUTH UNIV +1
Method for improving transparency of acid prepared from secondary baking flue gas of cyanidation tailings
ActiveCN105110301AHigh transparencyReduce cyanide contentSulfur compoundsProcess efficiency improvementEnvironmental resistanceDecomposition
The present invention relates to a method for improving the transparency of an acid prepared from secondary baking flue gas of cyanidation tailings. The method comprises the steps of cyanidation tailing decyanation, ore blending desulphurization, flue gas oxidation dissolution, initial sulfuric acid production, oxidative decomposition of residual nitrogen oxide and the like. The method provided by the present invention has the beneficial effects that 1) the cyanide content is reduced by sunshine exposure, baking, or roasting, and NOx is selectively oxidized by selecting a suitable oxidizing agent, reaction temperature, and reaction time to separate NOx from SO2, so that the transparency of a sulfuric acid product is ultimately improved while the operation steps are simple and easy to implement; and 2) the utilization rate of raw materials is high, almost no waste is discharged, the method is green and environmentally friendly; and the method is not harmful to the environment.
Owner:SHANDONG GUODA GOLD
Method for processing fixed bed fishing coker gas oil
ActiveCN102485842AReduce the impact of subsequent processingTreatment with plural serial stages onlyTreatment with hydrotreatment processesSlagFixed bed
The invention relates to a method for processing fixed bed fishing coker gas oil, which comprises the following steps: carrying out heat exchange of a coker gas oil raw material in a heat exchanger A to the temperature of 25-150 DEG C, carrying out mixed reaction with a refining agent in a static mixer, depositing by a settler and separating slag, discharging the sediment from the bottom of the settler, passing the refining oil through an electric settler, discharging the sediment from the bottom of the settler, refining an upper level refining oil through an adsorption filter, carrying out heat exchange on the refined oil by a heat exchanger F to the temperature of 60-500 DEG C and then entering to a catalytic cracking apparatus for catalytic cracking treatment. The adding weight of the refining agent accounts for 0.2-5% of coker gas oil raw material, the adsorption filtering medium is one of active carbon, white clay and diatomite or a compound. The method of the invention solves the problem of washing emulsification and residual nitrogen removal ingredients, and can reduce the influence of subsequent treatment.
Owner:PETROCHINA CO LTD +2
Method for preventing and controlling nitrogen and phosphorus non-point source pollution in farmland
InactiveCN109315103AEmission reductionAvoid spreadingFertilising methodsSoil-working methodsCarbon layerHydrolysis
The invention discloses a method for preventing and controlling nitrogen and phosphorus non-point source pollution in farmland. The method comprises the steps of control over a source of the farmlandnon-point source pollution, wherein the use amount of chemical fertilizer and chemical pesticide is reduced; 2, adoption of a farmland ditch interception system, wherein multiple longitudinal ditchesare excavated at equal intervals in the width direction of the farmland, multiple transverse ditches are excavated at equal intervals between every two adjacent longitudinal ditches, and bio-carbon layers, soil layers, bio-carbon layers and soil layers are sequentially laid in the longitudinal ditches and the transverse ditches respectively from top to bottom; 3, adoption of a farmland tail waterpurification interception system, wherein a water collection ditch communicated with the longitudinal ditches is formed in the ridge of the farmland, and a water purification device is arranged belowthe lower end of the water collection ditch and comprises a water collecting and sand setting tank, a hydrolysis acidification tank, an anaerobic sedimentation tank, an ecological purification tank and a clear water pool which are communicated with one another in sequence. According to the method, not only can residual nitrogen and phosphorus elements in the farmland be efficiently and quickly removed, but also discharge of nitrogen and phosphorus can be effectively controlled, and recycling of farmland drainage is achieved.
Owner:曲靖促创科技有限公司
Flue-cured tobacco cultivation method capable of effectively controlling high-nitrogen soil fertility
ActiveCN106365854AControl fertilityReduce nitrogenSuperphosphatesBio-organic fraction processingFarmyard manureBiology
The invention discloses a flue-cured tobacco cultivation method capable of effectively controlling high-nitrogen soil fertility. The cultivation method comprises the following steps: A. before transplantation, making a pond in a tobacco field, and applying a phosphate fertilizer in the pond; B. during the transplantation, applying an organic magnesium potassium sulfate fertilizer, an organic induced disease-resistant agent, a microbial inoculant and biochar into the pond, and after finishing the transplantation, applying well-rotted farmyard manure and covering the pond; C. 10-15 days after the transplantation, applying an all-water-soluble organic fertilizer solution in the pond; D. 40-60 days after the transplantation, spraying an organic potassium fertilizer and a boron zinc molybdenum fertilizer; and E. 55-60 days after the transplantation, carrying out tip pruning on the tobacco plants. The method is simple to operate, and is capable of effectively controlling the high-nitrogen soil fertility and lowering the residual nitrogen element in the high-nitrogen soil. The first batch of nitrogen element which can be easily decomposed in the soil is firstly released, thereby satisfying the demands of early growth and quick tillering of the transplanted tobacco plants. Meanwhile, the method can effectively control the phenomena of regreening and excessive vegetative growth in the tobacco plants.
Owner:YUNNAN TOBACCO CO LTD KUNMING BRANCH
Water-saving and pollution-reducing method for water circulation use in irrigation and drainage coupled ecological irrigation district in flat areas
InactiveCN104591395AEasy to manageReduce the impactSustainable biological treatmentBiological water/sewage treatmentWater cyclingWetland
The invention discloses a water-saving and pollution-reducing method for irrigation and drainage coupled water circulation use in a flat ecological irrigation district, wherein an irrigation district drainage period and an irrigation district water need period are comprised; during the irrigation district drainage period, field drained water enters a cyclically-adjusting wetland reservoir through a drainage ditch, sediments, pesticides and heavy-metal harmful substances are intercepted and purified through a submerged plant zone and an ecological wetland purification island system, and nitrogen and phosphorus nutrient substances are treated, thus reducing the harms of drainage to the water bodies of rivers and lakes; during the irrigation district water need period, water bodies in the cyclically-adjusting wetland reservoir are extracted by a water extraction pump and distributed to irrigation district farmlands, thus increasing the utilization efficiency of water resources, wherein the residual nitrogen and phosphorus nutrient substances can also be needed by the growth parts of crops. The water-saving and pollution-reducing method disclosed by the invention has the advantages of coupling irrigation and drainage processes in the ecological irrigation district, reducing the influences caused by the drainage of farmland surface source pollutants on rivers and lakes, increasing the utilization efficiency of water resources and chemical fertilizers, and realizing the sustainable development of the ecological water-saving irrigation district agriculture.
Owner:HOHAI UNIV
A method for manufacturing an isolation structure of an LDMOS
ActiveCN109216257AAvoid it happening againWiden the depletion regionSemiconductor/solid-state device manufacturingSemiconductor devicesLDMOSSilicon oxide
The invention relates to a method for manufacturing an isolation structure of an LDMOS, comprising the steps of: forming a first trench on a wafer surface; Filling the first trench with silicon oxide;Removing a portion of the silicon oxide surface in the first trench by etching; Forming a silicon oxide corner structure at a corner at the top of the first trench by thermal oxidation; Depositing anitrogen-containing compound on the wafer surface to cover the silicon oxide surface and the silicon oxide corner structure surface in the first trench; Dry etching the nitrogen-containing compound toremove the nitrogen-containing compound on the silicon oxide surface in the first trench to form the nitrogen-containing compound sidewall residue; A second trench is formed by further etching downward with the residual nitrogen-containing compound sidewall as a mask. The second trench is formed by etching downward with the nitrogen-containing compound sidewall as a mask. Forming a silicon oxidelayer on the sidewalls and bottom of the second trench; Removing the residue of nitrogenous compound sidewall; The first trench and the second trench are filled with silicon oxide. The invention can improve the breakdown voltage and save the lithographic plate.
Owner:CSMC TECH FAB2 CO LTD
Adsorption extractive preparation in use for refining solvent in use for base oil of lubricating oil
This invention relates to an adsorption-refinery agent for solvent refinery of base oil for lubricating oil. The adsorption-refinery agent is mainly composed of porous substances such as aluminum oxide and silicon oxide, and has a network skeleton crystal structure (an Al- octahedron layer sandwiched in two Si-O tetrahedron layers), and a defect structure caused by solvent modification. The adsorption-refinery agent, when used after refinery and denitrogenation of base oil, can effectively remove residual nitrogen in base oil, thus can increase the oil yield and filtration efficiency, and lower the filtration temperature.
Owner:涿州贝尔森生化科技发展有限公司
Natural particle size soil nitrogen grading method
ActiveCN106596536AFully research and evaluate featuresThorough research and evaluation of effectivenessMaterial analysis by observing effect on chemical indicatorColor/spectral properties measurementsPotassium persulfateUltraviolet
The invention discloses a natural particle size soil nitrogen grading method which particularly includes the steps: 1) extracting FN (free nitrogen) in soil samples by the aid of deionized water; 2) extracting IEN (ion exchange nitrogen) in the soil samples by the aid of KCl (kalium chlorate); 3) respectively extracting CN (carbonate combined nitrogen) and IMON (iron and manganese oxide nitrogen) in the soil samples by the aid of acetate-acetate buffer solution and NaOH (sodium hydroxide); 4) extracting HN (acid hydrolysis nitrogen) the soil samples by the aid of HCl (hydrochloric acid); 5) measuring RN (residual nitrogen) by the aid of an alkaline potassium persulfate digestion-ultraviolet spectrophotometer method. According to the method, grading of nitrogen in the soil is refined under the natural particle size, more scientific and comprehensive grading is achieved, grading accuracy and grading reliability are ensured by the aid of section of different chemical extracting agents and extracting orders.
Owner:SOUTHWEST UNIVERSITY
Flue gas purification method
InactiveCN101721908AEfficient capturePromote oxidationLighting and heating apparatusDispersed particle separationPurification methodsSorbent
A method of scrubbing mercury compounds and nitrogen oxides from a gas stream employing a scrubbing operation. The method involves the contact of the stream which contains mercury, SOx and NOx compounds with a sorbent to remove at least a portion of the latter compounds. This results in a partially cleaned stream. The method further involves contacting the latter stream with an oxidant to oxidize and remove substantially all residual nitrogen oxides, mercury and mercury compounds remaining in the stream.
Owner:AIRBORNE CLEAN ENERGY
Superconducting magnet second-stage cooling apparatus and second-stage cooling method
PendingCN108630376APerformance is not affectedTo achieve the purpose of no liquid nitrogen residueSuperconducting magnets/coilsLiquid nitrogen containerSocial benefits
The invention relates to a superconducting magnet second-stage cooling apparatus which enables a superconducting coil to be cooled from the room temperature to a needed ultra-low temperature state without generating nitrogen sand particles in a liquid nitrogen container and the superconducting coil, and a second-stage cooling method. The superconducting magnet second-stage cooling apparatus comprises a superconducting magnet cooling apparatus; a cooling pipeline is arranged in the liquid nitrogen container of the superconducting magnet cooling apparatus; the inlet and the outlet of the coolingpipeline are coolant inlet and outlet respectively; and a three-way control valve is connected in the cooling pipeline in series, and the outlet of the three-way control valve is connected with the liquid nitrogen container. Advantages are achieved as follows: a condition that the residual liquid nitrogen in the liquid nitrogen container and the superconducting coil is changed into residual solidnitrogen sand particles when the superconducting magnet is cooled to a lower temperature caused by existence of the residual nitrogen in the liquid nitrogen container in the prior art can be solved fundamentally, so that no liquid nitrogen residue is realized, and it is ensured that the performance of the superconducting coil is not influenced; and in addition, compared with full liquid nitrogencooling, each superconducting magnet cooling apparatus can save cost by 70% or above compared with that in the background technology, so that unexpected economic benefits and social benefits are achieved.
Owner:杭州汉胜科磁体设备有限公司
Fertilizer application method for growth of carrot in field
InactiveCN101427631AModerate water contentSweet tasteFertilising methodsHorticultureHectarePotassium
The invention discloses a crop planting method, specifically a field fertilization method for planting carrot. The applied fertilizer comprises: nitrogen fertilizer N: 180-250kg / hectare, phosphorus fertilizer P2O5: 120-180kg / hectare, potassium fertilizer K2O: 120-180kg / hectare, artificial manure 20000kg / hectare as basal fertilizer. The phosphorus fertilizer and the artificial manure are applied as basal fertilizer before sowing seeds and 50% of nitrogen fertilizer and potassium fertilizer are applied as basal fertilizer; and the residual nitrogen fertilizer and the potassium fertilizer are applied as additional fertilizer for two times. The carrot has suitable water content with soft and sweet taste and the yield is increased.
Owner:孙雪梅
Fertilizer application method for growth of Chinese cabbage in field and fertilizer thereof
The invention discloses a crop planting method, specifically a fertilization method for planting Chinese cabbage and fertilizer. The applied fertilizer comprises: nitrogen fertilizer N: 200-250kg / hectare, phosphorus fertilizer P2O5: 9-150kg / hectare, potassium fertilizer K2O: 80-120kg / hectare, artificial manure 1000kg / hectare as basal fertilizer. The 30% of nitrogen fertilizer, 30% of potassium fertilizer, 100% of phosphorus fertilizer and the organic fertilizer are used for basal application, and the residual nitrogen fertilizer and potassium fertilizer are applied for three times respectively in 15 days, 35 days, 50 days after germination. The yield of the Chinese cabbage can be increased by 8% with good taste and the Chinese cabbage is easy to be burnt.
Owner:孙雪梅
High-concentration oxygen generating plant with molecular sieves
ActiveCN102502511AImprove oxygen recoverySolve the service lifeOxygen preparationHigh concentrationMolecular sieve
Owner:济南瑞莱电气有限公司
A process for nitric acid production
ActiveUS20190284052A1Simple and cost-effective and efficientHydrogenGas treatmentNitrogen oxidesHydrogen
Owner:CASALE SA
System and Method for High Concentration Nitric Oxide Delivery
The present invention relates to systems and methods for administering high concentrations of nitric oxide (NO) gas to a patient without the need to provide supplemental oxygen to the patient. The systems and methods can be used to administer high therapeutic amounts of NO gas, for example a gas comprising 160 ppm NO, while forming little or no residual nitrogen dioxide (NO2). The method is based on using a NO gas source with a relatively high NO concentration, for example 5,000 ppm, while rapidly mixing the gas from the NO gas source with air immediately prior to administering the gas to a patient.
Owner:12TH MAN TECH
Processes and systems for treating aromatic feed including an aromatic component and nitrogen-containing impurities, and processes and systems for preparing a reaction product of the aromatic component
InactiveUS20130217945A1Solid sorbent liquid separationTreatment with plural serial refining stagesHydration reactionDistillation
Processes and systems for treating an aromatic feed comprising an aromatic component and nitrogen-containing impurities, as well as processes and systems for preparing a reaction product of an aromatic component from an aromatic feed comprising the aromatic component and nitrogen-containing impurities, are provided herein. In an embodiment, a process for treating an aromatic feed comprising an aromatic component and nitrogen-containing impurities includes adsorbing a portion of the nitrogen-containing impurities from the aromatic feed to produce a treated aromatic feed comprising the aromatic component and residual nitrogen-containing impurities. The treated aromatic feed and water are mixed to produce a hydrated aromatic feed. A purified aromatic feed and a water component are distilled from the hydrated aromatic feed in a distillation stage, wherein the water component comprises residual nitrogen-containing impurities from the treated aromatic feed and wherein the purified aromatic feed comprises the aromatic component.
Owner:UOP LLC
Method for processing tail gas produced by nitric acid
InactiveCN105289274AGuaranteed removal ratePromote accumulationDispersed particle separationAir quality improvementBiodieselAtmospheric air
The invention provides a method for processing tail gas produced by nitric acid. The method comprises the following steps: adjusting temperature of tail gas to a suitable scope between 25 and 35 DEG C for microbe growth, introducing the tail gas in a paracoccus nutrient solution, using denitrification of the paracoccus for reducing nitrate, nitrite and a nitrogen oxide in the tail gas to nitrogen, introducing the tail gas into a chlorella nutrient solution, using photosynthesis of chlorella for absorption and fixing of carbon dioxide, absorbing residual nitrogen oxide, and taking the residual nitrogen oxide as a nitrogen source for algae growth, wherein gas from two-step biological treatment is mixed with partial microbe spittle, so that the method connects water pipes in series and the microbe in gas can be diluted and absorbed with a certain degree, and finally discharging the gas to atmosphere after water absorption by calcium chloride. The biological treatment method has the advantages of cleaning and environmental protection, and is capable of processing exhaust gas and promoting thalline growth, the obtained paracoccus can be used as a feed, the chlorella can be used for processing biodiesel, and has prominent economic value.
Owner:TIANJIN CITY PO MOIST CHEM
Method for recovering and processing isobutyraldehyde tail gas of storage tank and apparatus thereof
ActiveCN102895841AEffective regulationAvoid emissionsDispersed particle separationProcess engineeringProduct gas
The present invention discloses an apparatus for recovering and processing isobutyraldehyde tail gas of storage tanks. A nitrogen tank (1) is communicated with a storage tank (3) through a gas pipeline I (5). The storage tank (3) is communicated with a reactor tank (8) through a gas pipeline II (6). A nitrogen valve (2) and a one-way valve (4) are disposed on the gas pipeline I (5) and the gas pipeline II (6). The reactor tank (8) is communicated with a water tank (9) through a gas pipeline III (7). The present invention also provides a method for recovering and processing, including: firstly, replenishing nitrogen to the storage tank (3) for storing isobutyraldehyde to make the nitrogen float on the liquid to form a nitrogen sealing; and secondly, discharging the mixed gas containing nitrogen and isobutyraldehyde tail gas in the reaction tank (8) into a methanol solution in the reactor tank (8) through an exhaust nozzle (11). The isobutyraldehyde tail gas in the mixed gas is adsorbed and dissolved by the methanol solution, and the residual nitrogen after floating is discharged into the water tank (9) for collection through the gas pipeline III (7).
Owner:江苏海企化工仓储股份有限公司
A method for manufacturing a stacked polysilicon gate structure of a semiconductor device
ActiveCN109216438AShort oxidation timeShorten the timeSemiconductor devicesPower semiconductor deviceSilicon oxide
The invention relates to a method for manufacturing a stacked polysilicon gate structure of a semiconductor device, comprising the steps of: forming a trench on a wafer surface; Filling the trench with silicon oxide by deposition; Part of the silicon oxide is etched back; Forming a corner structure at a corner of the top of the groove; Deposition of nitrogenous compounds; Dry etching nitrogen-containing compound, the corner structure surface forms nitrogen-containing compound sidewall residue extending into the groove; A part of silicon oxide is etched off by using the residual nitrogen-containing compound sidewall as a mask; Repeating the above three steps in turn until the silicon oxide in the trench is etched to the desired bottom silicon oxide thickness; Removing nitrogen compounds inthe trench; Filling polysilicon into the trench; Forming an isolated silicon oxide on the polysilicon; The above two steps are repeatedly performed to form a multilayer polysilicon and a silicon oxideisolation. The invention adopts the method of deposition and step etching to form the silicon oxide in the trench, which reduces the oxidation time and improves the production efficiency.
Owner:CSMC TECH FAB2 CO LTD
A method for manufacturing a semiconductor device having a field plate structure with a gradual thickness in a trench
ActiveCN109216439AReduce backspreadShort oxidation timeSemiconductor/solid-state device manufacturingSemiconductor devicesSilicon oxideImpurity
A method for manufacture a semiconductor device having a field plate structure with a gradual thickness in a trench includes forming a trench on a surface of a wafer; Filling the trench with siliconoxide by deposition; Removing a part of the surface by etching the silicon oxide in the trench; Forming a silicon oxide corner structure at a corner at the top of the trench by thermal oxidation; Depositing nitrogen-containing compounds on the wafer surface; Dry etching nitrogen-containing compound, silicon oxide corner structure surface forms nitrogen-containing compound sidewall residue extending into the trench; A surface part of that silicon oxide in the trench is remove by etching with the residual nitrogen-containing compound sidewall as a mask; Repeating the above three steps until thesilicon oxide in the trench is etched to the desired bottom silicon oxide thickness; Removing nitrogen compounds from trenches and fill the trenches with polycrystalline silicon. The invention reducesthe oxidation time and improves the production efficiency. And the backward diffusion of the substrate impurity to the epitaxial layer is reduced, and the process is simple.
Owner:CSMC TECH FAB2 CO LTD
Method of forming semi-insulating silicon carbide single crystal
ActiveUS7276117B2Polycrystalline material growthFrom chemically reactive gasesShallow donorAcceptor dopant
Owner:CREE INC
Method for improving secondary salinization of soil in facility cultivation
The invention discloses a method for improving secondary salinization of soil in facility cultivation, which comprises the following steps of: selecting a test plot, planting protection rows around the test plot, sowing plants and fertilizing in the test plot by adopting a drill sowing mode, wherein the seeding amount is 250-350kg / hm<2 >, irrigation is carried out until the soil is moist, a film is paved and moistened, the film is removed after the seeds sprout and come out of the soil, the seedlings are mowed after reaching 30-40cm, during the whole production period, the seedlings are mowedfor 6-8 times, no topdressing is carried out after each mowing, and the whole production period does not control plant diseases and insect pests; and the fertilizer for fertilizing is a microbial bacterial fertilizer or a rice chaff fungus matrix fertilizer. The method for improving the secondary salinization of the soil in the facility cultivation can obviously improve the pH value and CEC valueof the soil, can improve the fertilizer conservation effect of the soil and reduce the nitrate content in the soil; by planting the water spinach, the residual nitrogen in the soil can be reduced, andthe purposes of reducing the salt content of the soil and relieving the secondary salinization of the soil can be achieved.
Owner:TAICANG AGRI TECH EXTENSION CENT
Large-scale energy-saving gradient air separation process
PendingCN110395694AHigh purityHigh recovery rateNitrogen purification/separationOxygen preparationMolecular sieveDesorption
The invention provides a large-scale energy-saving gradient air separation process. Pressurized air which is dried and removed from carbon dioxide previously is subjected to adsorption separation by aradial zeolite molecular sieve pressure-swing absorber, causing the nitrogen to be adsorbed by the zeolite molecular sieve and 50%-85% of oxygen-enriched air to flow out of the zeolite molecular sieve pressure-swing absorber. The zeolite molecular sieve pressure-swing absorber is switched by a sequencing valve to deliver or discharge the high-purity nitrogen as a product after reduced pressure desorption thereof, and the zeolite molecular sieve pressure-swing absorber is reused. The oxygen-enriched air flowing out of the zeolite molecular sieve pressure-swing absorber is subjected to adsorption separation in a carbon molecular sieve pressure-swing absorber, causing the oxygen to be absorbed by the carbon molecular sieve and the residual nitrogen, argon, helium and the like to be discharged out of the carbon molecular sieve pressure-swing absorber; the carbon molecular sieve pressure-swing absorber is switched by the sequencing valve to discharge the high-purity oxygen as a product after reduced pressure desorption thereof, and the carbon molecular sieve pressure-swing absorber is reused.
Owner:CHINA UNIV OF PETROLEUM (EAST CHINA)
Water-saving and pollution-reducing methods for water recycling in plain areas coupled with irrigation and drainage in ecological irrigation areas
InactiveCN104591395BProtect environmentImprove utilization efficiencySustainable biological treatmentBiological water/sewage treatmentWater circulationFluvial
Owner:HOHAI UNIV
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