58 results about "Nitrogen balance" patented technology

The invention provides a formulation for a special prandial food, which contains short peptides and is provided for tumor sufferers to eat. The food uses food-originated short peptides as raw materials which are added with extracts of medical-edible Chinese herbal medicines such as champignons, dried orange peels, Chinese wolfberry, yams, tuckahoes, rhizoma polygonati, and the like, and compound complex formulation. With the food formulation, powdered or granular foods can be prepared and are dissolved with warm water to eat. The food prepared according to the formulation is easy to dissolve, can be absorbed and utilized quickly, provides a high quality nitrogen source for organisms, supplements various vitamins and minerals necessary for a human body, can correct the negative nitrogen balance of the tumor sufferers, improve the nutritional status of the tumor sufferers, and can play a role in improving organism immunity and suppressing and resisting cancers through the combined action of various factors such as bioactive components, the functional oligosaccharides, and the like in the food-originated short peptides and the extracts of the medical-edible Chinese herbal medicines, thus the food is suitable for the tumor sufferers, particularly for cancer patients who receive radiation therapy and chemotherapy to eat.

Phosphatidic acid is administered orally to increase muscle mass and strength in exercising mammals. Phosphatidic acid is administered orally to aging, bedridden or cachectic patients to improve nitrogen balance. The preferred form of phosphatidic acid for administration is phosphatidic acid-enriched lecithin. Creatine is co-administered orally to increase the muscle-building and strength effect. Other suggested additives include nutritional and herbal supplements, micronutrients and hormones.

The invention discloses a model for forecasting multi-dimensional flux migration and transformation of fertilizer urea nitrogen in paddy fields, mainly considering destination balance problem of fertilizer nitrogen, emphasizing effects to water environment, and protruding the migration of the fertilizer nitrogen to surface water and groundwater. The method is formed by coupling a water balance module and a nitrogen balance module. The nitrogen balance module comprises the nitrogen transformation processes such as urea hydrolysis, ammonia volatilization, nitrification, denitrification, fixing, mineralization, absorption and the like; the water balance module comprises the processes such as infiltration eluviation, lateral seepage and radial flow (containing drainage). The model disclosed by the invention can comprehensively simulate the effects of the nitrogen to the water environment during migration and transformation in the paddy field by using few parameters.

This invention involves a waterproof electrical cables, its features are: óƒ waterproof referred to by the three power cables cable cutter water blocking synthesis of single-core cables; ó each from the single-core cables, water blocking, followed by the conductor, water blocking layer powder , shielding layer, insulating layer, insulated shielding layer, with water blocking I semiconductor, metal shielding layer, with water blocking II semiconductor, water blocking layer and the outer sheathing layer composition. Oxygen-free copper conductors in the round pressed into¢—‘ surface water blocking coated powder, water blocking zone I and II packages for vertical band of aluminum-plastic composites at the same time squeezing packets polyethylene. Power cable provided with GB/T12706.2 the relevant requirements, and the aluminum-plastic composites with polyethylene, and stripping of the sheath of not less than 1.2 N / mm, charging to 50-100 Pa after dry air or nitrogen balance six hours, one end of the cable, not the air pressure drop.

The invention provides a formulation for a special prandial food, which contains short peptides and is provided for hepatopaths to eat. The food uses food-originated short peptides as raw materials which are added with extracts of medical-edible Chinese herbal medicines such as dandelions, champignons, kudzuvine root, meldar, jujubes, rhizoma polygonati, yams, and the like, and are supplemented with oligosaccharides, vitamins and minerals to form a compound formulation. With the food formulation, powdered or granular foods can be prepared and are dissolved with warm water to eat. The food prepared according to the formulation is easy to dissolve, can be absorbed and utilized quickly, provides a high quality nitrogen source for organisms, supplements various vitamins and minerals necessary for a human body, can correct the negative nitrogen balance of the hepatopaths, and improve the nutritional status of the hepatopaths without increasing the burden to a liver. Simultaneously, the formulation can protect the liver through the combined action of various factors such as bioactive components, the oligosaccharides, and the like in the food-originated short peptides and the extracts of the medical-edible Chinese herbal medicines, thus the food is suitable for the hepatopaths to eat.

The invention discloses a nitrogen balance spectroscopy-based wheat spring nitrogenous fertilizer application method, and a construction method of a nitrogen topdressing amount model thereof. The model construction method comprises the following steps: 1, determining a wheat target output and a yield increase coefficient; 2, determining the spectrum of wheat in a nitrogenous fertilizer blank area; 3, determining the spectrum of wheat in a spring sufficient nitrogenous fertilizer application area; 4, screening the equivalent expression form between a vegetation difference index and an optimized total nitrogen application amount; and 5, constructing the nitrogen topdressing amount model. The nitrogenous fertilizer application method comprises the following steps: A, acquiring information; B, determining the yield increase coefficient; C, determining the optimized total nitrogen application amount for the target output; D, determining the equivalent weight required by the difference index of per unit of vegetation; and E, calculating the nitrogen topdressing amount. A suitable nitrogenous fertilizer space-time optimization scheme is determined according to real-time on-site obtained wheat crop growth conditions, so the nitrogenous fertilizer utilization rate is improved on the premise of guaranteeing the output of crops, the application method adapts to inevitable requirements of development of the modern agriculture, and technical support is provided for technical development of accurate agriculture.

The invention provides a system for intelligently controlling a sewage plant on the basis of nitrogen balance. The system comprises an anaerobic tank, an oxygen deficiency tank, an aerobic tank, a sedimentation tank, a central control device, a mathematical model, a reflux pump, a gas supply device, a first ammonia and nitrogen measuring instrument, a DO (dissolved oxygen) measuring instrument, an online sludge concentration detecting instrument, a second ammonia and nitrogen measuring instrument, a nitrate nitrogen measuring instrument, a first sludge pump and a second sludge pump. The anaerobic tank, the oxygen deficiency tank, the aerobic tank and the sedimentation tank are sequentially connected with one another, and the reflux pump is arranged between the oxygen deficiency tank and the aerobic tank; the mathematical model is connected with the central control device; the reflux pump, the gas supply device, the first ammonia and nitrogen measuring instrument, the DO measuring instrument, the online sludge concentration detecting instrument, the second ammonia and nitrogen measuring instrument, the nitrate nitrogen measuring instrument, the first sludge pump and the second sludge pump are respectively connected with the central control device, the oxygen deficiency tank is provided with the first ammonia and nitrogen measuring instrument, the aerobic tank is provided with the DO measuring instrument and the online sludge concentration detecting instrument, the second ammonia and nitrogen measuring instrument and the nitrate nitrogen measuring instrument are arranged at the tail end of the aerobic tank, partial sludge in the sedimentation tank can flow back to the anaerobic tank by the aid of the first sludge pump, and the second sludge pump is used for discharging remaining sludge; technological parameters can be optimized by the mathematical model according to reading of the various instruments and set water outlet targets, and accordingly total nitrogen can reach standards. The system has the advantages that parameter optimization can be adjusted in real time, accordingly, the total nitrogen of the sewage plant can reach the level-1 A standards, the standard reaching rate is higher than 97%, and aeration energy consumption can be saved by 10% at least.

The invention provides a tumor immunity type nutritional composition. The tumor immunity type nutritional composition comprises a high-energy total-nutrient composition and an immune regulation component, wherein the high-energy total-nutrient composition comprises a protein source, a saturated fatty acid source and a carbohydrate source; the immune regulation component comprises new good materials, fungi and unsaturated fatty acid; the new food materials are selected from ginseng or tea polyphenol; the fungi are selected from lentinula edodes, tremella and coprinus comatus; the unsaturated fatty acid is selected from fish oil, purple perilla seed oil and seabuckthorn seed oil; and the mass ratio of the high-energy total-nutrient composition to the immune regulation component is (80-92): (8-20). The product disclosed by the invention is an immune formula which is high in protein, high in fat, low in sugar and high in energy; the energy substances provided by the protein, the fat and the carbohydrate are 18-25%, 48-55% and 25-32%, respectively; and by adopting a high-fat emulsification and micro-capsule embedding technology, the produced tumor immunity type nutritional composition is high in stability and slow in release, and is capable of relieving the symptoms such as negative nitrogen balance and lean body mass loss of the tumor patients, particularly the lung cancer and breast cancer patients.

The invention discloses a high-adsorption-capacity oxygen generation molecular sieve and a preparation method thereof. The molecular sieve is prepared from, by weight, 18-29 parts of halloysite, 13-21 parts of sepiolite, 28-36 parts of diatomite, 15-25 parts of wollastonite, 14-22 parts of potassium feldspar, 10-15 parts of spodumene, 8-14 parts of albite, 48-62 parts of sodium hydroxide, 32-44 parts of sodium metaaluminate, 24-36 parts of sodium metasilicate nonahydrate and 15-20 parts of seed crystal guide agent. The molecular sieve prepared by the method is high in nitrogen balance adsorption capacity which can reach higher than 30 ml/g, and has excellent mechanical strength and nitrogen-oxygen separation performance; a production process is simple, raw materials are extensive in source, and the molecular sieve is low in cost, renewable, reusable, environment-friendly and economical and can be popularized and applied in pressure-variable adsorption oxygen generators on a large scale.

The invention relates to a measuring method for nitrogen fertilizer utilization, and discloses a method for measuring the use rate of nitrogen balance nitrogen fertilizer of a greenhouse pot experiment. The method comprises the following steps of selecting representative surface soil; arranging the pot experiment, carrying out management, recording the grain yield and the straw yield when crops are ripe, and reserving samples for analysis; measuring the base soil total nitrogen content, the grain total nitrogen content, the total nitrogen content of soil in each pot after the crops are harvested. The calculation formula is REN[balance]=U/(FN+SN), wherein the REN[balance] represents the nitrogen fertilizer use rate calculated through a nitrogen balance method, the U represents harvest nitrogen elements, the FN represents fertilizer nitrogen elements, and the SN represents the storage capacity reduction quantity of nitrogen elements of soil of a soil body. The method is short in measuring time and accurate in measuring result, influence caused by the external environment on the method is low, the considered factors are comprehensive and reasonable, the measuring result is stable and reliable, fertilizer application can be well guided according to the recommended, amount calculated through the method, of applied fertilizer, and the method has high market popularization value and broad market prospect.

The invention relates to sugar-free lysine zinc gluconate granules and a quality detection method thereof, specifically belongs to the technical field of medicine, relates to a composition for supplementing lysine and zinc, especially zinc gluconate, in particular relates to granules for supplementing lysine and zinc, especially zinc gluconate, and more in particular relates to sugar-free lysine zinc gluconate granules for supplementing lysine and zinc, especially zinc gluconate. The invention also relates to a method for performing quality detection on the sugar-free lysine zinc gluconate granules. The lysine zinc gluconate granules are a mineral substance type OTC medicine. The sugar-free lysine zinc gluconate granules are clinically used for preventing and treating growth retardation, malnutrition, anorexia and the like of children and adolescents due to lack of lysine and zinc. The lysine contained in the lysine zinc gluconate granules is one of essential amino acids for maintaining the nitrogen balance of a human body and has the effect of promoting the growth of the human body; zinc is an important component for a plurality of enzymes in vivo, and has the effects of promoting growth and development and improving gustation.

The invention belongs to the field of machine tool design and relates to a split type vertical machining center spindle box structure with the modularization characteristic. According to the technical scheme, the split type vertical machining center spindle box structure is designed, the part for mounting a spindle is called a spindle box, the part connected to a stand column is called a spindle box connector component, the spindle box is designed into a general component, and the spindle box connector component is divided into a linear rail spindle box connector component and a hard rail spindle box connector component. The spindle box and the spindle box connector component are connected through bolts, and the geometric accuracy in the assembling process is ensured through a reference plane and a wedge-shaped press block on one side of the spindle box connector component. A nitrogen balance cylinder is mounted in the spindle box connector component. Interchange and recombination of the general spindle box and a multi-axis head on the spindle box connector component are achieved by demounting and mounting the wedge-shaped press block and screws.

The invention discloses a high-pressure nitrogen balance weight balance cylinder system for workpiece machining. The high-pressure nitrogen balance weight balance cylinder system comprises a nitrogenbalance component, a controller and a nitrogen container. One side of a fixed plate is fixedly connected with a first sliding rail, a gear rack is arranged at the top of the first sliding rail, one side of the first sliding block is fixedly connected with a servo motor, and an output shaft of the servo motor is fixedly connected with one end of a rotary shaft arranged on the hollow portion of thefirst sliding block. The other end of the rotary shaft is rotationally connected with one side of the inner wall of the first sliding block, the middle of the rotary shaft is connected with a gear through a connecting key, the bottom of the first sliding block is fixedly connected with a spindle box, and one side of the spindle box is connected with an air cylinder piston rod, stretching outwards,on an air cylinder body through a connecting block. According to the high-pressure nitrogen balance weight balance cylinder system, the problems that a traditional air balance weight balance cylindersystem does not have the advantages of being sensitive in response during vertical movement of an axis Z, reducing forward and reverse buffering, effectively improving the surface smoothness of workpiece machining and being capable of increasing the movement speed are solved.

The invention discloses a high-precision numerical control machining center transmission mechanism. An X-axis nut base (5) and an X-axis screw rod (6) at the bottom of a workbench (4) are in thread fit, and the rear end of the X-axis screw rod (6) is connected with an X-axis motor. Nitrogen balance cylinders (24) are symmetrically arranged on the left side and the right side of a Y-axis sliding base (11), an output shaft of a spindle motor (19) is connected with the input end of a gearbox (20), an output shaft of the gearbox (20) is sleeved with a driving wheel (21), and the driving wheel (21) is connected with a driven wheel on a spindle (23) through a belt (22). Various axial movements are achieved through large-torque motors and screw rod nut pairs, machining of complicated surfaces can be achieved, high-speed cutting can be achieved, and low-speed large-torque cutting can also be achieved. The gravity of a spindle box is balanced through the nitrogen balance cylinders, and the load on the Z-axis motor can be reduced effectively.

The invention discloses a ketogenic diet formula comprising, according to the weight percentage, 70+/-5% of soybean, 20+/-5% of rapeseed oil, 10+/-5% of eggs, 2% of konjac flour, and 1% of various vitamins and minerals. The invention provides the novel ketogenic diet formula; the problems that conventional ketogenic diet easily leads to negative nitrogen balance and hypoproteinemia, increases in-vivo protein consumption and increases body fat are solved, and the ketogenic diet formula has the effects of controlling body weight, not increasing body fat, alleviating insulin resistance and leptinresistance, controlling blood sugar and regulating blood lipid.

The invention discloses a method for culturing high-quality Eriocheir sinensis. The method comprises the steps of pond preparation, juvenile Eriocheir sinensis stocking, aquatic plant management, water quality management, gapping on-sale and adult Eriocheir sinensis fattening. A pond is improved through digging out accumulated silt and excessive organic matters of the bottom of the pond, cleaningup the pond and then applying a soil improvement agent prepared from a fermented base fertilizer and an EM (Effective Microorganisms) stock solution, and meanwhile, a variety of aquatic plants are planted, so that the aquatic plant coverage of the pond in different seasons is guaranteed; and the aquatic plants are trimmed regularly, and a fertilizer is applied to promote growth of the aquatic plants and purify water. Meanwhile, beneficial florae are applied to purify the water; and furthermore, due to long-term feedstuff feeding, the water is high in nitrogen content and low in carbon content,thus, brown sugar is required to be applied to maintain a carbon-nitrogen balance of the water and guarantee the pond of fat and tender water, and thus, the growth of the Eriocheir sinensis is facilitated. During fattening of the Eriocheir sinensis, the fat content of feedstuff is increased, and molasses is scattered into the water, so that the amount of planktons of the water is increased, feedstuff of the Eriocheir sinensis is increased, and the growth of the adult Eriocheir sinensis is accelerated. The Eriocheir sinensis cultured by the method disclosed by the invention is full in spawn, delicious in taste and high in quality, is deeply popular to the market and has good economic benefits.

The invention discloses a multifunctional CNC (computer numerical control) gantry machining center. An auxiliary water tank (1c) is disposed at the tail end of a support table (1a); an X-axial nut seat (5) at the bottom of a workbench (4) is in threaded fit with an X-axial screw (6); the rear end of the X-axial screw (6) is connected with an X-axial motor; nitrogen balance cylinders (24) are symmetrically disposed on left and right sides of a Y-axial slide base (11); an output shaft of a spindle motor (19) is connected with the input end of a gearbox (20); an output shaft of the gearbox (20) is sleeved with a driving wheel (21); the driving wheel (21) is connected with a driven wheel arranged on a spindle (23), through a belt (22). The multifunctional CNC gantry machining center allows machining of complex profiles and is available for high-speed cutting and low-speed high-torque cutting, the weight of a spindle box is balanced through the nitrogen balance cylinders, load of a Z-axial motor can be effectively reduced, and the auxiliary water tank is integrated to a base so that oil and water leakage problem is basically solved.

The invention relates to the technical field of health foods, in particular to a heath food for promoting postoperative recovery and a preparation method thereof. The heath food is prepared from, by weight parts, 68-73 parts of soybean protein oligopeptide, 5-15 parts of L-glutamine, 0.4-0.8 part of multi-vitamins and 0.4-0.8 part of composite mineral elements. The soybean protein oligopeptide serves as an egg white ingredient to supplement enough energy for the organism, enough vitamins and trace elements are supplanted for the organism by combination with L-glutamine, multi-vitamins and composite mineral elements, necessary amino acids for metabolism are provided for the organism, nutrition is balanced, electrolyte balance of extracts is maintained, metabolic disorders caused by increase of increase of excretion resulting from ingestion reduction, fever, bleeding and leakage after an operation are made up for, a mutual synergistic interaction effect is generated, the nitrogen storage capability of the organism is enhanced, nitrogen balance of the organism is promoted, the nitrogen storage rat is improved, and postoperative recovery time is shortened.

The invention relates to a method for smelting COST-FB2 steel through gas-phase nitriding under a negative pressure condition. The method comprises the following steps that firstly carbon deep deoxidation is performed under the condition of high vacuum degree, deoxidation is completed after the surface of molten steel is stable and bubbles do not rush out any longer; then an alloy element for promoting nitrogen dissolution is added and completely molten, and then gas-phase nitriding is started; during gas-phase nitriding, nitriding pressure during gas-phase nitriding is calculated by using thermodynamic calculation software Factsage, the molten steel temperature is accurately controlled, and the nitriding time is calculated and determined through the surface area of the molten steel, the volume of the molten steel and the nitrogen balance content; when gas-phase nitriding is about to be completed, the alloy element boron and the volatile manganese are added, then through argon filling,pressurization is performed until the high pressure is reached, pressurization casting is performed under the condition that the nitrogen partial pressure is kept unchanged, the under-pressure stateis kept in the solidification process, vacuum breaking is performed after complete solidification, and a COST-FB2 steel cast ingot which has the content of N being 0.015%-0.03% and the content of O being less than or equal to 0.0035%, is uniform in component and compact in structure is prepared.

The invention discloses a nitrogen balance cylinder system for weight balance of a machine tool. The nitrogen balance cylinder system comprises a nitrogen bottle, a controller and a nitrogen balancer; the controller is arranged on the nitrogen bottle; a servo motor is used for driving a ball screw to rotate so that a ball screw nut can drive a main shaft of the machine tool and the body of the nitrogen balancer to move up and down relative to a piston rod; when the main shaft of the machine tool moves up, the controller is capable of sending an instruction to open a gas charging valve, and the nitrogen bottle is capable of supplying nitrogen into the body of the nitrogen balancer; and when the main shaft of the machine tool moves down, the controller is capable of sending an instruction to close the gas charging valve and open a gas discharging valve. By the nitrogen balance cylinder system disclosed by the invention, the main shaft of the machine tool is more stable when moving up and down, and the servo motor is uniformly loaded when the main shaft of the machine tool moves up and down; the nitrogen balance cylinder system disclosed by the invention is capable of improving the stability of the motion process and improving the machining precision and the surface quality of a product, applicable to high-speed cutting, free of use of a power source and pipes, compact, small in floor space, small in pressure changes and stable in balance force.

The invention discloses a sheep feed and its production technology. The production technology of the sheep feed mainly comprises the following steps: using zinc sulfate, ferrous sulfate, anhydrous copper sulfate, potassium iodide, sodium selenite, cobalt chloride, manganese sulfate, VA, VC and VD to prepare a premix, and uniformly mixing slow-release non-protein nitrogen with calcium hydrogen phosphate, distiller's grains, feather meal, cottonseed meal, sunflower meal, leaf powder, calcium carbonate, anhydrous sodium sulfate, sodium bicarbonate, yeast and the premix to prepare the sheep feed. A slow-release non-protein nitrogen technology and trace elements are adopted to realize sulfur and nitrogen balance, electrolyte balance, calcium and phosphorus balance, amino acid balance and osmotic pressure balance in order to make protein sources directly decomposed by sheep rumens, and the release of the slow-release non-protein nitrogen is synchronous with the development and absorption of thalli in the rumens, so the absorption rate increases to 96-98%, and the feeding cost is reduced; and beneficial bacteria are decomposed and absorbed by the rumen under the action of acetic acid, so long wool, rapid weight gain and economic benefit increase are reached.

The invention discloses a model for optimizing the nitrogen application rate of potato fields by drip irrigation in the north foot of Yinshan Mountain, Inner Mongolia, and applications thereof. Nitrogen balance based nitrogen application rate optimizing model and a nitrogen fertilizer using amount optimizing and application method applying the model and nitrogen absorption law during potato growing are included. The method can reduce the traditional nitrogen application rate of farmers under the circumstance of guaranteeing that the yield of potatoes does not reduce but even slightly increases, and optimizes stage fertilization time, times and using amount according to the nitrogen absorption law of the potatoes; and through total quantity control, a stage allocation mode can optimize thenitrogen fertilizer using amount of potato fields, so that the green sustainable development of agriculture with equal emphasis on production and environmental protection can be realized while the efficient configuration of nitrogen resources is enhanced.

The invention discloses a full-nutrition special medical use formula food for trauma patients. The formula food consists of the following raw materials by mass percentages: 6-7% of marine fish collagen peptide, 6-7% of cod protein oligopeptide, 8-10% of whey protein, 12-13% of vegetable oil powder, 28-30% of maltodextrin, 23-25% of isomalt, 5-6% of dietary fiber, 2.2-2.22% of mineral matter, 0.098-0.103% of vitamin, and 3-4% of moisture. The food uses marine fish collagen peptide and cod protein oligopeptide as a matrix, and creatively uses the matrix as a nutrient component of a nitrogen source, and the research and development of the special medical use formula for trauma, infection, surgery and other stress states fundamentally correct the negative nitrogen balance in patients and improve symptoms such as malabsorption.

The invention discloses a method for evaluating the total content of nitrogen in a coniferous tree seedling. The method comprises the following steps: (1) determining the absorbancy of polyphenol and chlorophyll of the coniferous tree seedling with a small sample size, and determining the content of the nitrogen of a material of the over-ground part of the coniferous tree seedling with the small sample size; (2) obtaining a nitrogen balance index by using the determined absorbancy of the polyphenol and the chlorophyll, calculating the related coefficient of the nitrogen balance index and the content of the nitrogen of the coniferous tree seedling, and building a regression equation of the balance index and the content of the nitrogen of the coniferous tree seedling; and (3) determining the absorbancy of the polyphenol and the chlorophyll of the coniferous tree seedling with the large sample size, and obtaining the total content value of the nitrogen corresponding to the coniferous tree seedling by using the built regression equation. By adopting the method disclosed by the invention, the total content of the nitrogen of the upgraded over-ground part of the coniferous tree seedling can be quickly and accurately determined, the workload for large-area investigation of the total content of the nitrogen of stems and leaves is reduced, the method has the advantages of being accurate to investigate, simple and convenient to carry out, low in cost and the like, and the damage to the vegetation is reduced.

The present invention provides a compound branched chain amino acid injection. The injection provided by the present invention increases the weight parts of the branched chain amino acid to lead the weight parts within 35 to 50 percent of the total amount of amino acid and effectively keeps a nitrogen balance of the organism; the prescription ratio of necessary amino acid and unnecessary amino acid is increased to about 1.7, thus better recovering the inordinate plasma amino acid spectrum of the organism in trauma to the normal range and achieving the ideal nutritious effect on the patient under the stress state.

The invention provides a corn growing season nitrogen fertilizer application method based on an optimized spectral index, which comprises the following steps: (1) nitrogen balance total amount control: controlling the corn growing season nitrogen fertilizer application total amount through nitrogen balance; (2) corn nitrogen nutrition diagnosis: acheiving the real-time monitoring of the nitrogen nutrition index of the corn in the growing season by optimizing the spectral index; and (3) a corn growth season nitrogen fertilizer recommendation algorithm based on the optimized spectral index. According to the method, the nitrogen nutrition status of the corn is monitored in real time by optimizing the spectral index, and a nitrogen balance and critical nitrogen concentration dilution curve is used as a nitrogen fertilizer dosage regulation and control range; determination of the reasonable nitrogen application amount in the corn field is the key of obtaining high target yield, maintaining soil nitrogen fertilizer power and reducing environmental pollution caused by nitrogen application; and theoretical and technical foundations can be laid for accurate management of the nitrogen fertilizer in corn intelligent agriculture, and ecological green development which focuses on production and environmental protection is realized while efficient utilization of nitrogen resources is improved.

The invention relates to the technical field of nitrogen cylinders, and discloses a nitrogen cylinder of a nitrogen balancing system. The nitrogen cylinder comprises a nitrogen cylinder body and a transportation balancing mechanism, the transportation balancing mechanism comprises a chassis, limiting columns, balancing rings and balancing plates, and each limiting column is in a circular truncated cone shape with the diameter gradually increased from top to bottom. According to the nitrogen cylinder of the nitrogen balancing system, through the arrangement of the transportation balancing mechanism, positioning mechanisms linkage mechanisms and fastening mechanisms, the two sets of balancing rings are tightly limited and connected with the middle and the bottom of the nitrogen cylinder body through the eight sets of positioning mechanisms distributed in an annular array manner, then the balancing rings and the balancing plates are in contact connection through the linkage mechanisms, the balancing rings and the balancing plates are connected through linkage plates A and linkage plates B which are arranged in a V-shaped state in a normal state, and the balancing plates and the limiting columns are positioned under extrusion and fastening of the fastening mechanisms. According to the nitrogen cylinder, the protective effect on the nitrogen cylinder body in the transportation process is improved.

The invention discloses a crossbeam-fixed type high-precision numerical control gantry machining center which is characterized in that a spindle box (15) is disposed between two Z-axis slide rails (14), and the Z-axis nut seat at the back of the spindle box (15) is matched with a Z-axis screw in a threaded manner; nitrogen balance cylinders (24) are symmetrically disposed on the left and right sides of a Y-axis slide seat (11); the piston rod of each nitrogen balance cylinder (24) extends out upwardly; the output shaft of a spindle motor (19) is connected with the input end of a gear box (20), a drive wheel (21) sleeves the output shaft of the gear box (20), and the drive wheel (21) is connected with a driven wheel on a spindle (23) through a belt (22). The crossbeam-fixed type high-precision numerical control gantry machining center has the advantages that the axial movements are achieved by the large-torque motor and the screw-nut pair, machining of complex profiles can be achieved, high-speed cutting can be achieved, and low-speed and large-torque cutting can be achieved; the gravity of the spindle box is balanced by the nitrogen balance cylinders, and the load of a Z-axis motor can be effectively reduced to guarantee Z-axis movement stability.