61 results about "Solid nitrogen" patented technology

The invention provides a nitrogen-doped graphene nanoribbon and a preparation method thereof. The preparation method of the nitrogen-doped graphene nanoribbon provided by the invention comprises the following steps of: firstly, by taking an inorganic covalent compound of iron namely ferric trichloride as a catalyst precursor and a solid nitrogen-containing organic compound as a carbon source, preparing a nitrogen-doped, iron-filled carbon nanotube by a floating-catalyst chemical vapor deposition method; next, putting the nitrogen-doped, iron-filled carbon nanotube in an oxidant solution, performing ultrasonic dispersion and then putting the mixed solution in an oil bath for heating reflux; cooling until the temperature reaches a room temperature, performing water washing until the solution is neutral; finally, performing vacuum drying to obtain the nitrogen-doped graphene nanoribbon. The nitrogen-doped graphene nanoribbon and the preparation method thereof provided by the invention are characterized in that lots of shortcomings of the prior art are overcome and the advantages of simple, environment-friendly preparation method and moderate reaction conditions are realized. The nitrogen-doped graphene nanoribbon provided by the invention can be applied to a lithium battery as an anode material.

The invention relates to a method for preparing a surface self-grown titanium nitride conducting film modified lithium titanate, which comprises the following steps of: uniformly mixing lithium titanate powder with solid nitrogen source in proportion in a dispersion medium in a mode of ultrasound or ball milling, drying the obtained slurry at the temperature of between70 and 120 DEG C, raising temperature to 600 to 900 DEG C in the inert protective atmosphere after grinding, preserving the heat for 10min to 1h, and then cooling together with a furnace to obtain the surface self-grown titanium nitride conducting film modified lithium titanate. Through heat nitrogen reaction, a layer of high-conductive film TiN is self-grown on the surface of the lithium titanate; the TiN film is firmly combined with the lithium titanate; and the prepared high-conductive Li4Ti5O12 / TiN material has high multiplying power of charge-discharge property and excellent circulating property. The preparation method has the advantages of low cost, simple operation and safety, and easy realization of mass production.

It is an object of the present invention to improve the stability of a gas field ionization ion source.A GFIS according to the present invention is characterized in that the aperture diameter of the extraction electrode can be set to any of at least two different values or the distance from the apex of the emitter to the extraction electrode can be set to any of at least two different values. In addition, solid nitrogen is used for cooling. According to the present invention, it is possible to not only let divergently emitted ions go through the aperture of the extraction electrode but also, in behalf of differential pumping, reduce the diameter of the aperture. In addition, it is possible to reduce the physical vibration of the cooling means. Consequently, it is possible to provide a highly stable GFIS and a scanning charged particle microscope equipped with such a GFIS.

The invention belongs to the field of battery materials, and particularly relates to a cathode material for a lithium battery. The invention discloses a method for preparing a lithium titanate / titanium nitride composite material, which comprises the following steps of: grinding titanium dioxide serving as a titanium source, lithium titanate and solid nitrogen source uniformly in a disperse medium, drying at the temperature of between room temperature and 120 DEG C, and grinding; and firing under the protection of vacuum or inert gas, and then naturally cooling to obtain the lithium titanate / titanium nitride composite material, wherein the nitrogen source is selected from one or mixture of more than two (comprising two) of urea, biuret, cyanamide, dicyandiamide, melamine, cyanuric acid monamide and cyanuric acid diamide. The method for directly preparing the Li4Ti5O12 / TiN composite electrode material by adding the solid nitrogen source into the raw materials for preparing Li4Ti5O12 does not increase the preparation process, has low cost, simple process and low energy consumption, and is easy to realize scale production.

The invention discloses a method for preparing a coating containing Ti (C and N) with melamine as a carbon and nitrogen precursor and relates to the technical field of ceramic / metal composite coating preparation. The method includes the following steps of 1, preparation of the graphite phase g-C3N4; 2, substrate pretreatment; 3, coating layer pre-forming and drying; 4, plasma cladding; and 5, formation of finished products. The low-cost organic compound containing carbon and nitrogen, namely, melamine serves as the carbon and nitrogen precursor, and carbon nitride powder is prepared in advance and serves as a solid carbon and nitrogen source for in-situ synthesis of the metal ceramic composite coating containing Ti (C and N). The powdery solid nitrogen source is stable in structure, convenient to weigh and accurate in weighing. The quantity of the solid nitrogen source can directly affect the phase composition and the coating structure and performance of end products obtained through the in-situ reaction after fusion covering, so that the mass fraction of the solid nitrogen source is changed to accurately adjust and control the organization structure and performance of the coating so as to meet the design requirements, and the novel method is also provided for surface strengthening of agricultural machinery materials or tools and molds.

The invention belongs to the technical field of preparation of carbon nanomaterials, and provides a novel method for synthesising nitrogen-doped graphene by taking melamine as a main nitrogen and carbon source and methane as an auxiliary carbon source through a chemical vapour deposition method under the normal-pressure condition. Other catalysts, except for a metal substrate, and a conventional gas or liquid nitrogen source are not used in the method; therefore, the method is low in cost, non-toxic, simple and convenient to operate and convenient in process application; furthermore, no specific requirement for equipment exists in the reaction process; other heating devices, except for a main heating device, are unnecessary; therefore, the method is high in operability and is applied to practical popularization; the temperature of copper is slowly increased in the low-temperature stage at first; a nitrogen source and a carbon source are simultaneously introduced into a tubular furnace for one time when the temperature of copper reaches reaction temperature; then, the temperature is rapidly decreased to room temperature after completing reaction; at the time, a layer of nitrogen doped graphene film is formed on the surface of metal; and structural regulation and control, such as the doping amount and doping type of nitrogen in graphene and the thickness and crystallization degree of graphene, can be realized through the parameters, such as the optimized nitrogen source amount, temperature matching of front and rear temperature areas, the reaction time and the reaction temperature.

A process for producing slush nitrogen, comprising charging a low-temperature container with liquid nitrogen and arranging an ejector capable of drawing out liquid nitrogen by suction by spewing a refrigerant liquid or gas, such as low-temperature helium gas or liquid helium of pressure higher than in the space within the container, into the container so that the liquid nitrogen drawn out by suction by the refrigerant and spewed together with the refrigerant is refrigerated by the refrigerant, becomes particulate solid nitrogen and falls, while discharging the gas lying in the space within the container outside the container so as to constantly maintain the space at atmospheric pressure or higher. Further, there is provided a method of refrigerating a superconductive object including a substance exhibiting a superconductive state at temperatures close to the temperature of liquid nitrogen or close to the temperature at which the liquid nitrogen and the solid nitrogen coexist, characterized in that the object is immersed in slush nitrogen held in an adiabatic container so as to effect contact of the object with slush nitrogen and refrigeration thereof.

The invention discloses a preparation method of an efficient phosphorus and nitrogen intumescent flame retardant and an application of the phosphorus and nitrogen intumescent flame retardant to polycaprocactam. The preparation method comprises the steps: carrying out condensation reaction on p-phthalaldehyde and 4,4'-methylenedianiline (DDM), and then, carrying out addition reaction on the product and DOPO to obtain solid nitrogen and phosphorus containing flame retardant molecules; and then, uniformly mixing the obtained flame retardant with polycaprolactam resin, and carrying out melt blending at 220-260 DEG C to obtain a halogen-free flame retardant polycaprolactam material. The method is capable of realizing synthesis at one step without separating intermediate products, simple in synthesis process, simple and convenient in aftertreatment, high in efficiency, safe, environment-friendly and convenient to realize industrial mass production; and the flame retardant belongs to a polymer-type flame retardant, contains a carbon source, an acid source and a nitrogen source, does not contain halogens and is nontoxic, pollution-free, green and environment-friendly, polycaprolactam reaches the UL94V-0 level when the addition amount of the flame retardant is 15%, and the mass percentage of residues is 37.8% at 700 DEG C.

The invention provides a crash-proof electric vehicle which mainly comprises a vehicle body and a safe air bag system, wherein the safe air bag system comprises crash sensors, a buffering air bag, an air generator and a control block, and the safe air bags are made of materials with higher breakage resistance and are respectively arranged at the front side, the left rear side and the right rear side of a driver. When the front side or a certain angle between the left side and the right side of the electric vehicle are crashed at high speed, the electric vehicle can suddenly decelerate, the crash sensors arranged on the front end and both sides of the electric vehicle can transmit a signal to the control block, an electrothermal igniter arranged in the air bag can be instantly ignited after analysis and confirmation to generate explosion, solid nitrogen grains are rapidly gasified, a lot of nitrogen blows the air bag immediately and enables the air bag to expand, and the air bag clashes a box cover and safely expands under strong impact force immediately. The invention has the advantages that the safe air bags are arranged at the front side, the right side and the left side of a human body to protect the upper half part of the human body and greatly increase the safety of the electric vehicle.

The invention provides an achromobacter sp CZ207 strain capable of resisting heavy metal such as cadmium, copper, lead, nickel and manganese and promoting the plant growth. The achromobacter sp CZ207 strain is preserved in CCTCC (China Center for Type Culture Collection) on March 7, 2016, the address is Wuhan University, Wuchang District, Wuhan City, Hubei Province, and the preservation number is CCTCC NO: M2016091; a 16S rDNA (Ribosomal Deoxyribose Nucleic Acid) sequence of the achromobacter sp CZ207 strain is as shown in an SEQ ID NO.1. Through observation on an LB solid culture medium, bacterial colonies are light yellow, tidy and moist, and the center parts of the bacterial colonies bulge; through microscopy observation, the bacterial colonies are in gram-negative, are rod-shaped and have no spores. The achromobacter sp CZ207 strain provided by the invention can tolerate multiple heavy metals, can secrete nutrient elements such as plant growth hormone, dissolved inorganic phosphorus and solid nitrogen and has the function of promoting the plant growth.

The invention relates to a single component micro-propulsion module device based on additive manufacturing technology. The device is characterized by comprising a micro-thruster assembly, a gas addingand discharging valve, a liquid adding and discharging valve, a solid nitrogen generator, a temperature sensor, a pressure sensor, a bursting disc safety device, a tank assembly and a control drive circuit; the gas adding and discharging valve, the solid nitrogen generator, the temperature sensor, the pressure sensor, the tank assembly, the liquid adding and discharging valve, the bursting disc safety device and the micro-thruster assembly are installed in series in a module gas room. The invention provides a novel device and method for safety isolation of a propulsion system, the high integration is facilitated, the system complexity is reduced, the reliable operation of an entire system is guaranteed, and the work performance of the entire system is improved.

The invention relates to a single-phase alpha-Si3N4 micropowder and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: uniformly mixing 5-30 wt% of simple substance silicon powder, 15-45 wt% of solid nitrogen source and 40-80 wt% of halide powder to prepare a mixture; putting the mixture into an electric tube furnace, heating to 1000-1300 DEG C at the heating rate of 2-10 DEG C / minute in a nitrogen atmosphere, and keeping the temperature for 2-6 hours; repeatedly washing the product with deionized water until no white precipitate appears when respectively titrating with AgNO3 and Ca(NO3)2 solutions; and finally, drying at 110 DEG C for 10-24 hours to obtain the single-phase alpha-Si3N4 micropowder. The preparation method has the characteristics of low reaction temperature, low cost, simple synthesis technique, controllable process, high yield and wide industrialization prospects. The particle size of the prepared single-phase alpha-Si3N4 micropowder is 100-500nm; and the single-phase alpha-Si3N4 micropowder has the advantages of no impurity phase, high activity, small particle aggregation and uniform particle size distribution.

The invention discloses a testing device for suspension and guide characteristics of a high-temperature superconducting bulk material under a high temperature condition. The testing device is composed of a space positioning system, a temperature control system and a data acquisition system. In a temperature control process of the temperature control system, a pumping speed of a numerical control vacuum pump is controlled, so that surface steam pressure of liquid or solid nitrogen in a Dewar equipped with the high-temperature superconducting bulk is controlled; the aim of accurately controlling a working temperature of the superconducting bulk is realized by utilizing a liquid-gas and solid-gas phase-change heat absorption and cooling principle of nitrogen. The temperature control range is 77K-53K and the control precision is + / -0.1K. The space positioning system and the data acquisition system are combined; and the testing device can be used for measuring the suspension and guide characteristics of the single high-temperature superconducting bulk material or the plurality of high-temperature superconducting bulk materials with different arrangement manners in the temperature range of 77K-53K.

The present invention discloses a marine escape door. The marine escape door comprises a door frame installed on a cabin, notches being disposed at all four corners of the door frame; an escape door installed inside the door frame and equipped with a lock, a baffle plate being installed at a side face of the escape door, a ring of air sac being installed at one side of the baffle plate and being internally equipped with solid nitrogen particles, and electric detonators being installed at four corners inside the air sac; and a switch being installed in the center of an inner surface of the escape door and connected with the four electric detonators. Through the above method, the marine escape door provided by the present invention is used inside the cabin, a conventional escape door is hard for escape because the cabin door has the characteristics of being excellent in leakproofness, and with adoption of the air sac of the marine escape door, the door and the door frame can be separated, thereby ensuring smooth escape of people.

The invention discloses a solid nitrogen energy storage driving drug. The drug comprises, by weight, 50-70 parts of neutral inorganic salt, 15-22 parts of plant extract containing high carbon, 1-5 parts of active metal powder and 5-15 parts of stabilizer. The solid nitrogen energy storage driving drug converted to inert driving gas by excitation of heat energy is used for driving extinguishant in a fire extinguisher directly, so that dangers caused by the explosive fire extinguisher during processes of production, storage, transportation, mounting, use and the like can be eliminated, safety of the fire extinguisher is improved, and application range is expanded. In addition, size of an extinguisher container is reduced effectively, cost of normal detection and maintenance is reduced, service life of the extinguisher is prolonged greatly, long-term driving and spraying of the extinguishant can be achieved, prohibition and fire suppression for a fire scene are achieved more effectively, and extinguishing efficiency is improved.

The invention discloses a synthetic method of chitosan biomass-derived high-yield nitrogen-doped fluorescent carbon nanodots and belongs to the field of biomass carbon material synthetic technology. The invention aims to solve the problem of low synthetic yield of biomass-derived fluorescent carbon nanodots existing in the prior art. The synthetic method of the invention comprises the following steps: dissolving a chitosan derivative containing unsaturated double bond in ultrapure water, carrying out hydrothermal carbonization and successively carrying out centrifugal separation, dialysis and freeze-drying treatment so as to obtain solid nitrogen-doped fluorescent carbon nanodots. The dimension of the prepared nitrogen-doped carbon nanodots is 3-5nm. The surface of the carbon nanodots contains amino group, carboxyl group and hydroxyl group. Quantum efficiency is 20-30%. The chitosan containing unsaturated double bond is used as a carbon source, and high-yield (46%) synthesis of the chitosan biomass-derived nitrogen-doped fluorescent carbon nanodots is realized. The method of the invention is expected to realize preparation of the carbon nanodots in macroscopic quantity.

A method and apparatus for weakening a storm uses liquid or solid nitrogen. In one embodiment, the method includes the steps of providing liquid nitrogen enclosed within at least one container, dropping the container into a storm, and dispersing the liquid nitrogen from the container starting at the top of the storm, whereby the nitrogen cools and therefore weakens the storm. In another embodiment, the method includes the steps of providing solid nitrogen pieces each sized to melt and evaporate in the time it takes to fall from the top of a storm along a major portion of the height of the storm and dropping the solid nitrogen pieces into a storm, whereby the melting and evaporating nitrogen cools and therefore weakens the storm.

The invention discloses a refrigerating system which belongs to the technical field of refrigeration. The refrigerating system comprises a nitrogen tank which contains liquid nitrogen or solid nitrogen, a pressure reducing and temperature raising module connected with the nitrogen tank for reducing pressure or raising temperature of the liquid nitrogen or solid nitrogen exhausted from the nitrogen tank, and an evaporator connected with the pressure reducing and temperature raising module for evaporating the liquid nitrogen processed by the pressure reducing and temperature raising module. According to the refrigerating system provided by the invention, needed temperature range is realized by pressure reduction and temperature raise of high voltage and low temperature liquid nitrogen which is further evaporated by the evaporator to meet the comfortable temperature demand of a user. The system is simple in integral structure and can be used for refrigeration of an automobile air-conditioning system in summer environment. High pressure nitrogen is used as a cold source, and no power is needed to be obtained from an automobile engine for the air-conditioning refrigerating system, therefore, the integral dynamic property and fuel economy are effectively improved. The nitrogen is used as a refrigerant, so that pollution by conventional refrigerants such as R134a to environment is eliminated, and the green refrigerating system is effectively realized.

An apparatus for producing a slush fluid wherein a liquid and solid particles are mixed together, comprising product tank (1) for storing the slush fluid (50) in its saturated condition; liquid nitrogen supply nozzle (10) provided at an upper part of the product tank (1); and compressor (15) for evacuating the interior of the product tank, which apparatus is adapted to spray a liquid in microparticulate form through the liquid nitrogen supply nozzle (10) into the product tank evacuated by the compressor (15) and to solidify the liquid particles by evaporative latent heat, thereby forming solid nitrogen (51). Preferably, the apparatus has a circulatory system for circulating the gas discharged from the product tank (1) by the compressor (15) to the liquid nitrogen supply nozzle (10), which circulatory system includes heat exchangers (13a,13b) for heating the discharged gas to ordinary temperature by heat exchange; the compressor (15) for compressing the heated gas to thereby produce high-pressure ordinary-temperature gas; the heat exchangers (13a,13b) for cooling the high-pressure ordinary-temperature gas to thereby produce high-pressure low-temperature gas; and auxiliary chilling refrigerator (17) and heat exchanger (16) for chilling the high-pressure low-temperature gas to thereby condense the same.

The invention relates to a resource recovery device for source-separated urine. Specifically, urine firstly passes through an immobilized biological pretreatment system, then a membrane separation system is employed to recover water resource in the urine, ozone disinfection and decoloration are carried out on the recovered water source, then the water source is subjected to pressurized storage andreutilization, while finishing water resource recovery, a urine reduction treatment effect can be realized, thereby reducing the scale of a follow-up nitrogen-phosphorus resource recovery system; theconcentrated water generated by membrane separation enters the resource recovery system, by means of depth hydrolysis, agent adding, struvite precipitation, crystalline product dehydration and a series of steps, a solid nitrogen-phosphorus nutrient element recovery product can be obtained; and the nutrient recovered waste liquid is discharged into a slow percolation land treatment system to increase the number of active microorganisms in water, and transportation of the treated water into the pretreatment system can achieve the effect of enhancing the hydrolysis rate. The device provided by the invention realizes simultaneous recovery of water resource and nitrogen and nitrogen-phosphorus nutrients in urine, and the recovery product has few impurities.

Liquid nitrogen is filled in a low temperature vessel; an ejector that sucks liquid nitrogen by blowing a cooling agent (liquid or gas) such as low temperature helium gas or liquid helium of pressure higher than in the space within the vessel is disposed in the vessel; the liquid nitrogen blown with the cooling agent is cooled by the cooling agent to become fine particles of solid nitrogen which fall down; and gas in a space of the vessel is discharged out of the vessel so as to maintain the pressure of the space higher than the atmospheric pressure. A gaseous phase of liquid nitrogen in an adiabatic vessel is depressurized to vaporize nitrogen in a liquid phase so that a temperature of the nitrogen is reached to the triple point of nitrogen by lowering temperature thereby and solid nitrogen is produced by keeping at the triple point, and that the produced solid nitrogen is transformed into slush by stirring the content of the adiabatic vessel. In a method for cooling a super conductive body in which a material showing a state of super conductance in the vicinity of the temperature of liquid nitrogen or of the temperature liquid nitrogen and solid nitrogen coexist is used, a method for cooling a super conductive body characterized in that the super conductive body is immersed in slush nitrogen held in an adiabatic vessel, and that the body is contacted with slush nitrogen to cool.

A high-efficient nitrogen-fixing engineering bacterium, its construction and use are disclosed. The engineering bacterium is prepared by inducing copied plasmid containing DctBDP fragment with tetrodicarboxylic acid trans-gene into combined nitrogen-fixing engineering bacterium and obtaining high-efficient nitrogen-fixing engineering bacterium. It can be used for high-efficient nitrogen-fixing bacterial manure.

The invention relates to a fire extinguishing system for buses. A pump set type high-pressure water mist fire extinguishing device is connected to a high-pressure pipeline; a plurality of nozzles are arranged on the high-pressure pipeline; the fire extinguishing system is additionally provided with a superfine dry powder fire extinguishing device; the superfine dry powder fire extinguishing device is connected to an ejecting pipeline; a plurality of nozzles are arranged on the ejecting pipeline; the superfine dry powder fire extinguishing device has the following structures: a tank for accommodating a superfine dry powder fire extinguishing agent is arranged in a cabinet body; a siphon is arranged inside the tank, and the upper end opening of the siphon is communicated with the outlet of the tank; an ejecting element is arranged at the outlet of the tank; an ejecting main pipeline is externally connected to the outlet of the tank; the fire extinguishing system is additionally provided with a nitrogen generating chemical box; a solid nitrogen generating agent is accommodated in the nitrogen generating chemical box; an electric igniter is externally connected to the nitrogen generating chemical box; the upper end of the nitrogen generating chemical box is located on the outer side of the tank, and other parts of the nitrogen generating chemical box are located inside the tank; a plurality of nitrogen outlets are formed in the sidewall of the nitrogen generating chemical box; and the nitrogen outlets are communicated with the interior of the tank.

The invention discloses a tea interplanting cultivating technology. Interplanting cultivation is realized on tea through the adoption of a plant rich in nitrogen, and the plant rich in nitrogen is clover. When interplanting cultivation is realized on the tea and the clover, the clover, a perennial root plant, can continuously grow for more than ten years in general, and meanwhile, has flourishing side roots after forming a turf. Compared with other weeds, the clover has stronger competitiveness. The most important point is that the clover has powerful solid nitrogen energy, the decrease of soil nitrogen quantity due to water loss and soil erosion can be greatly reduced, and a large quantity of organic fertilizers rich in nitrogen are provided for the tea. The tea interplanting cultivating technology is simple in procedures, low in cost and great in market prospects.

The invention discloses a high-nitrogen alloy core-spun yarn, and relates to the technical field of molten steel refining. The core-spun yarn consists of a coating layer, a core powder layer and a guide core; the core powder layer is compounded between the guide core and the coating layer; the guide core is filled with a high-nitrogen layer; the core powder layer comprises a silicon iron nitride alloy, a solid nitrogen alloy element iron alloy and silicon base rare earth alloy powder; and the high-nitrogen layer comprises a vanadium nitrogen alloy, vanadium iron nitride and silicon iron nitride powder. The core-spun wire adopts a novel alloy material with a nitrogen content above 25%, which is relatively lower in cost and is prepared by calcining general alloy silicon iron powder for steelalloying in a nitriding furnace; and the core-spun wire is simple in preparation of raw materials and low in cost, and prominently improves the steel structural strength.

The invention relates to the field of sewage treatment, in particular to a municipal sewage treatment system comprising an adjustment pool (4), a treatment pool (1), a sludge pool (5) and a sludge concentration pool (6) which are connected sequentially through a pipeline. A stirring device (2) is arranged on the rear side wall of the treatment pool (1) and comprises four fixed stirring blades different in length, a baffle (250) perpendicular to the fourth stirring blade (25) is arranged at the end of the same, and pebbles (3) are laid in the treatment pool (1). Irregular flowing of water flow in the treatment pool can be realized, the water flow can be fully disordered, medicament placed into the treatment pool can be ensured to be mixed with a water body fully, and the pebbles, with surface mycoderm, below the treatment pool can be made to contact with the water body above the treatment pool, so that decrease amount of chemical oxygen demand (COD) and biochemical oxygen demand (BOD) in water can be increased, and effect of removing carbon, sulfur and solid nitrogen can be realized to greatest extent.

The invention discloses a solid-state micro-security device based on a solid nitrogen micro-actuator and an explosion initiating sequence based on the security device. The nitrogen micro-actuator in the security device is connected with a silicon / organic glass base plate main body through a fixed-connecting bridge, an integral structure is formed, the assembling process is simplified, the security device can conduct arming by not depending on environmental force, and the reliability of the security device is improved; the security device adopts a gas producing explosive material based on a nitrogen generating agent, the driving pressure can be ensured, large displacement is achieved, the gas producing temperature can further be controlled, and accidental detonation is prevented; and in addition, the explosion initiating sequence based on the security device is further provided with the structures of a flyer and the like, and the output capability of an output explosive is improved, so that detonating of an insensitive explosive is facilitated.