819 results about "Low oxygen" patented technology

The invention relates to the technical field of sewage treatment, in particular to an aerobic aeration treatment system for plateau domestic sewage treatment, which comprises a pretreatment unit, a biological treatment unit, an advanced treatment unit and a recycling unit which are connected in sequence, the system further comprises a data acquisition module, an aerobic aeration intelligent regulation and control module, a biochemical environment constant-temperature maintenance module, a carbon-nitrogen proportion and backflow dynamic regulation and control module, a digital twinning and sludge characteristic simulation module and an energy collaborative scheduling module. Compared with the prior art which adopts a standard aeration strategy and cannot adapt to the special environment of low air pressure and low oxygen partial pressure of the plateau, the system can accurately adapt to the plateau environment by integrating real-time atmospheric pressure and water temperature monitoring, dynamically calculating the oxygen saturation solubility and correcting the aeration control target according to the oxygen saturation solubility, so that the aeration control target is optimized. Stable supply of dissolved oxygen required by biochemical reaction is ensured, and the technical bottleneck of low efficiency of traditional sewage treatment in plateau regions is fundamentally overcome.

The invention belongs to the technical field of nano materials, and relates to a carbon thermal reduction driven high-entropy oxide metastable-state material and a preparation method and application thereof.The preparation method comprises the steps that S1, carbon and soluble metal salt are dissolved in a solvent for ultrasonic treatment, and a metal salt solution and a carbon suspension are obtained; s2, adding a metal salt solution into the carbon suspension, adding strong base, and stirring to obtain a coprecipitation polymer; s3, re-dispersing the coprecipitation polymer in the solvent, adding extra ferric salt and urea, mixing and stirring, and freeze-drying the mixed solution to obtain precursor powder; s4, performing staged annealing treatment on the precursor powder under low oxygen partial pressure to obtain a carbon-loaded high-entropy oxide metastable-state material; the prepared high-entropy oxide metastable-state material is of an alloy phase and high-entropy oxide double-phase coupling structure, the polarization loss of electromagnetic waves is enhanced through a heterogeneous interface, and the high-entropy oxide metastable-state material has the advantages of being excellent in impedance matching and wide in electromagnetic wave absorbing bandwidth and can be widely applied to the fields of industrial electronics, medical communication and military stealth.

The invention discloses a method for refining grains of a titanium alloy. According to the method, an original low-oxygen-content titanium alloy plate is subjected to cryogenic pretreatment, the temperature of the core of the original low-oxygen-content titanium alloy plate is reduced to a certain temperature, then the cryogenic low-oxygen-content titanium alloy plate is fed into a rolling mill, the single-pass reduction rate is controlled, cryogenic rolling is completed, high refinement and uniform distribution of crystal grains are achieved, and the low-oxygen-content titanium alloy plate is obtained. And the rolled titanium alloy plate is subjected to subzero treatment again, and the titanium alloy plate of the complex twin crystal structure formed by intersection of {11-22} and {10-11} twin crystals is obtained. The method has the beneficial effects that under the synergistic effect of low oxygen and deep cooling, even under the extremely small deformation amount, the cross effect of various twin crystal systems can be efficiently activated, a high-density and complex twin crystal structure is formed, high refinement and uniform distribution of crystal grains are achieved, then the mechanical strength and low-temperature toughness of the material are remarkably improved, and the service life of the material is prolonged. And the application requirements in a severe low-temperature service environment are met.

The invention discloses a preparation method of niobium-tungsten alloy spherical powder and a 3D printing method of the niobium-tungsten alloy spherical powder, and belongs to the technical field of refractory metal material preparation.The preparation method comprises the steps that niobium, tungsten, molybdenum and zirconium refractory metal raw materials are smelted to obtain cast ingots with uniform components, and hydride powder is formed after hydrotreating and mechanical crushing; spherical powder is prepared by adopting a plasma spheroidizing technology, then dehydrogenation is performed for 1-3 hours at the temperature of 450-750 DEG C, magnesium powder is added, treatment is performed for 2-5 hours in an inert atmosphere at the temperature of 800-1100 DEG C, and finally the low-oxygen niobium-tungsten alloy spherical powder with the oxygen content lower than 120 ppm is obtained. Compared with a traditional process, the spheroidizing treatment is innovatively carried out before the dehydrogenation and oxygen reduction process, the deoxidation efficiency is improved through the relatively small specific surface area of spherical powder, and oxygen content control is achieved in combination with magnesium powder heat treatment. The problems of high oxygen content and low powder yield in a traditional process are solved, and material support is provided for high-performance niobium-tungsten alloy components in the fields of aerospace, nuclear power and the like.

The invention belongs to the technical field of electronic packaging and welding materials, and relates to lead-free solder powder for reflow soldering and a preparation method of the lead-free solder powder. The lead-free solder powder is based on a Sn-Ag-Cu alloy system, and melt purification, beta-Sn grain refinement and interface IMC stabilization are achieved by compositely adding trace Ce and Ni elements. The Sn-Cu-Ce alloy comprises the following components in percentage by mass: 2.9%-3.1% of Ag, 0.45%-0.55% of Cu, 0.01%-0.10% of Ce, 0.01%-0.05% of Ni and the balance of Sn and impurities. During preparation, a Ce-Ni intermediate alloy is adopted to introduce microalloy elements, and the spherical solder powder is obtained through vacuum melting, inert gas atomization and surface treatment. The obtained solder powder is low in oxygen content, good in wettability, slow in interface IMC growth after backflow, high in welding spot strength and excellent in thermal cycle reliability, and is suitable for the field of high-reliability electronic packaging.

The invention discloses a water quality monitoring device and a monitoring method thereof, belongs to the technical field of water quality monitoring, and solves the problems that trace hydrogen sulfide generated by sulfate reducing bacteria in a deposited layer at the bottom of a water tank which is not cleaned for a long time in a low-oxygen environment reacts with a platinum membrane electrode of a residual chlorine sensor to generate a platinum sulfide covering layer; and the electrode reading is continuously virtually high and drifts slowly. Comprising an optical transmitting module, an optical receiving module, a spectrum separation module, a signal conditioning module, a lock-in amplification module, a spectrum feature extraction module and a hydrogen sulfide recognition engine. Residual chlorine is monitored in a non-contact mode, deep ultraviolet pulse light is emitted to penetrate through a water body, a reflection spectrum is received, second derivative spectral characteristics are extracted through multichannel signal processing, and multivariable regression compensation is executed to calculate a real residual chlorine value after hydrogen sulfide interference characteristics are recognized. Meanwhile, the drift trend is quantified based on the double-time-constant integral, graded early warning is triggered, industrial standard signals are finally output, and the problem of electrode contact pollution is avoided in the whole process.

The invention relates to a shallow coal seam stope face oxygen concentration dynamic distribution model construction and real-time updating method, belongs to the technical field of coal mine safety monitoring, and aims to solve the technical problems that a traditional monitoring means cannot obtain an oxygen concentration space full view and a static model is difficult to track a dynamic mining environment. According to the technical scheme, at least four sensors are arranged on a coal face to form a gradient monitoring network, and oxygen concentration data of multiple positions are collected in real time; constructing an exponential decay function to characterize the distribution rule of the concentration along the tendency; solving an undetermined coefficient based on a nonlinear least square method with space-time constraint; and dynamically calculating a model updating period t through an environment complexity index ECI, and triggering model iteration. Working face oxygen concentration global dynamic sensing, low-oxygen risk area accurate early warning and ventilation decision intelligence are achieved, and the mine safety prevention and control capacity is remarkably improved.

The invention relates to the technical field of metal powder preparation, and discloses a high-zinc alloy powder preparation method and system.The method comprises the steps of raw material pretreatment and vacuum deep degassing, vacuum melting and active degassing, flow stabilization and diversion and gas-liquid synergistic atomization, solidification and collection under the protective atmosphere, and aftertreatment and packaging under the oxygen-free environment; the system is composed of a vacuum deep degassing unit, a vacuum melting and active degassing unit, a gas-liquid collaborative atomization unit, a powder collecting and cooling unit and an anaerobic operation and packaging unit. The high-quality zinc alloy powder which is low in oxygen content, high in sphericity degree and uniform in component can be stably prepared, and the method is suitable for being applied to the fields of additive manufacturing and thermal spraying.

The present invention belongs to the technical field of the treatment of solid waste. Disclosed is a method for preparing a CO-rich fuel gas on the basis of a gasification slag smoldering technique. The method is carried out in a smoldering reaction device. By combining a smoldering treatment technique with the processes of drying, dehydration, pyrolysis, gasification, oxidation, etc., of gasification slag and controlling corresponding reaction conditions, a CO-rich fuel gas with a low oxygen concentration can be ultimately prepared, thereby achieving the efficient utilization and harmless treatment of gasification slag. In the method for preparing a CO-rich fuel gas on the basis of a gasification slag smoldering technique in the present invention, the steps are simple, and the control involved therein is convenient and fast; by means of fully combining the smoldering treatment technique with the processes of drying, dehydration, pyrolysis, gasification, oxidation, etc., of the gasification slag, the efficient treatment of the gasification slag can be achieved, the CO-rich fuel gas with a low oxygen concentration is obtained, and combustible components in the gasification slag are fully recycled, thereby achieving the recycling of resources and adequately ensuring the availability of the recycled resources; and the method has very high economic value.

The invention discloses a manganese-doped Ir-Ta oxide composite coating titanium anode and a preparation method thereof. The titanium anode comprises an insoluble titanium base material, an oxide middle layer and an oxide catalyst layer which are sequentially arranged, wherein the oxide catalyst layer is composed of an iridium (Ir) oxide, a tantalum (Ta) oxide and a doped manganese (Mn) element. The preparation method comprises the following steps: carrying out sand blasting and surface treatment on a titanium substrate to increase the roughness and binding force of the surface, then carrying out proper intermediate layer coating on the surface of the substrate, and finally preparing the manganese-doped Ir-Ta oxide composite coating on the surface of the intermediate layer. Compared with a traditional titanium anode, the prepared manganese-doped Ir-Ta oxide composite coating titanium anode has the advantages of being higher in reaction specific surface area, lower in oxygen evolution potential, longer in catalytic life and the like, and meanwhile the transition metal element manganese is higher in reserve, lower in price and high in oxygen evolution activity.

The utility model belongs to the field of additive manufacturing, and relates to aeration type smoke dust treatment equipment which comprises a reaction cavity loaded with an inert and aeration equipment extending into the reaction cavity, the interior of the reaction cavity is in a low-oxygen or oxygen-free environment; the reaction cavity is provided with a smoke gas inlet, a smoke gas outlet, a material supplementing opening and a slag discharging opening which are communicated with the reaction cavity; metal smoke dust to be treated enters the reaction cavity through the smoke dust gas inlet and / or the aeration equipment and then directly impacts or is introduced into the inerts to be physically combined with the inerts, and the purified metal smoke dust is discharged through the gas outlet. The utility model provides the aeration type smoke dust treatment equipment which is high in safety degree and easy to operate.

The invention relates to the technical field of plateau medicine and intelligent medical equipment, and discloses a stepped deoxidation treatment system for plateau crowd hypoxia acclimatization time and application, and the system comprises a data acquisition module, an initial information input module, a central processing module and an oxygen flow regulation and control module. The system inputs individual genetic background and baseline physiological data of a patient, and acquires multi-modal physiological parameters and hypoxia-induced biomarkers in real time. The central processing module fuses multi-source information, constructs a multi-modal physiological load index, dynamically divides a habit stage by combining genetic information, and then inputs the multi-modal physiological load index and the habit stage into an adaptive optimization model to generate an oxygen flow regulation instruction. And the oxygen flow regulation and control module executes an instruction to control oxygen supply to form dynamic closed-loop feedback. According to the method, the personalized self-adaptive deoxidation path can be generated, and the efficiency and accuracy of hypoxia acclimatization are improved on the premise of guaranteeing safety.

The invention relates to the technical field of tunnel fire monitoring and early warning internet, in particular to a tunnel fire early warning method and system suitable for high altitude and low oxygen. The method comprises the following steps: firstly, performing environmental data compensation on various sensors in a tunnel, and then obtaining multi-dimensional monitoring data; then, triggering a subsequent fire accurate detection process under the dual conditions that the concentration change of the double gases in the same time period exceeds a threshold value or the characteristics of the double flames in the same space exceed the threshold value; then, in a fire accurate detection process, an abnormal area is positioned, multiple sequences are generated based on an analysis window, an objective abnormal weight is calculated in combination with information entropy, and a static index fire comprehensive confidence coefficient and a dynamic index deterioration speed and a deterioration speed shutter are obtained; and finally, performing graded early warning based on the fire comprehensive confidence coefficient, the fire deterioration speed and the fire deterioration speed trend, accurately matching the coping requirements of different development stages of the high-altitude low-oxygen tunnel fire, and ensuring the accuracy and timeliness of early warning.

The invention relates to the technical field of deoxidation regulation and control, in particular to plateau adaptability intelligent stepped deoxidation regulation and control equipment and method, and the method comprises the steps: obtaining multi-dimensional index sign data of a target in a plurality of oxygen supply stages in a plateau environment; determining a first adaptive state of the target at each moment according to the time sequence change of the multi-dimensional index sign data of the target in the first oxygen supply stage; according to the first adaptive state, determining the adaptive duration for the target to reach a stable state, and according to the adaptive duration and the time sequence change of the multi-dimensional index sign data, determining the adaptive capacity of the target to hypoxia; determining an oxygen supply concentration adjustment value when entering a second oxygen supply stage according to the adaptive capacity, and determining an actual stepped concentration adjustment moment of the second oxygen supply stage by taking preset stepped concentration adjustment data as a reference; and determining a target second adaptive state according to the oxygen supply concentration adjustment value and the actual stepped concentration adjustment moment, and determining a stepped concentration adjustment value of the second oxygen supply stage according to the second adaptive state.

The invention discloses a body training mask for passively adjusting oxygen concentration in breathing air, and relates to the technical field of physical training equipment, the body training mask comprises a body training mask mechanism, the outer side of the body training mask mechanism is connected with a bandage mechanism, and one side of the body training mask mechanism is provided with a filtering mechanism. According to the body training mask, the first-layer mask body and the second-layer mask body are flexibly connected through the flexible connecting piece, folding operation can be conveniently carried out in the using process, the size of the mask can be adjusted through a folding structure, and then the oxygen concentration can be accurately adjusted and controlled according to the breathing dead space principle; after the volume of the mask is adjusted by the folding structure, low-oxygen exhaled air which is not completely exhausted in the closed space is mixed with outside fresh air in the mask to form a stable low-oxygen environment, the volume of the mask is increased by unfolding the folding structure, the breathing dead space is enlarged, and the oxygen concentration is reduced; the contraction folding structure reduces the size, the breathing dead space becomes small, and the oxygen concentration is increased.

The invention relates to the field of metal processing, and provides a method for preparing metal material powder of a flexible circuit board by gas atomization, which comprises the following steps: smelting metal raw materials for preparing the flexible circuit board to obtain molten metal, introducing the molten metal into an atomization device by using a pressure device for atomization, and crushing the molten metal by conveying high-pressure gas in the atomization process to obtain the metal material powder of the flexible circuit board. And metal liquid drops are formed, cooled and collected, and metal powder is obtained. According to the method, the metal powder special for the flexible circuit board, which is high in sphericity degree, narrow in particle size distribution and low in oxygen content, can be effectively prepared through stable control over the molten metal, the flowability and spreading uniformity of the powder are remarkably improved, and the method is suitable for a precise printing or additive manufacturing process; the problems of large particle size deviation, high defect rate and the like caused by a traditional atomization method are solved, the prepared metal powder is excellent in conductivity and flexibility after being sintered, and the method is suitable for manufacturing flexible electronic devices under high-frequency and high-deflection scenes.

The invention discloses spring round steel with high strength, high toughness and long fatigue life and a production method of the spring round steel, and belongs to the technical field of spring round steel production, the key of the chemical components of the spring round steel is that the spring round steel comprises 0.90-1.10% of Ni and 0.13-0.17% of V, and the content of harmful elements such as O, N, S and P is strictly controlled. Ultra-low oxygen content and extremely high purity are ensured by adopting VD vacuum refining, surface decarburization is effectively prevented by applying argon and vacuum atmosphere protection heating, non-recrystallization region low-temperature rolling is implemented to refine grains, and an optimized quenching and medium-temperature tempering heat treatment system is matched. The technical bottlenecks that the strength and toughness of traditional spring round steel are difficult to consider, and the fatigue life is easily influenced by inclusions and decarburized layers are successfully solved, the final product still has excellent impact toughness and extremely long fatigue life when the tensile strength reaches the ultra-high strength level of 1900 MPa or above, the comprehensive performance is remarkably superior to that of an existing product, and the production cost is reduced. And the harsh requirements of automobile light weight on high-performance spring materials are met.

The application relates to the technical field of agricultural application, in particular to application of 3,5-dihydroxytoluene in improving low-temperature and low-oxygen tolerance of tobacco seedlings. The application finds and proves that the 3,5-dihydroxytoluene can be applied to improve the low-temperature and low-oxygen tolerance of the tobacco seedlings and promote the growth of the tobacco seedlings. Meanwhile, the exogenous 3,5-dihydroxytoluene treatment is easy to operate in practice, has effects, and is expected to become a good method for improving the low-temperature and low-oxygen stress resistance of tobacco floating seedling production practice, and has great application potential.

The invention discloses flue gas recirculation and oxygen-enriched combustion collaborative denitration equipment for a pulverized coal fired boiler, and belongs to the technical field of collaborative denitration. The pulverized coal boiler comprises a heat exchange tank, and a combustion tank and a smoke return pipe are arranged in the heat exchange tank. One side of the smoke return machine shell communicates with a combustor shell, and the combustor shell communicates with the combustion tank. An igniter and a graded oxygen-enriched combustor are arranged in the combustor shell, and the graded oxygen-enriched combustor comprises a central oxygen channel structure, a pulverized coal air channel structure and a compensation oxygen channel structure; core flames of pulverized coal air are ignited through the central oxygen channel structure, then the pulverized coal air with low oxygen content sprayed out of the pulverized coal air channel structure is ignited through the core flames, and a low-oxygen combustion section close to the root of the fire tongue is formed. Oxygen is sprayed out through the compensation oxygen channel structure, so that pulverized coal air is subjected to oxidation reaction and is fully combusted; according to the invention, a staged combustion effect can be formed, nitrate substances generated by a pulverized coal oxidation reaction are greatly reduced, and the capability of denitration of combustion flue gas is improved.

The invention discloses an in-vehicle oxygen content control method, device and equipment, a medium and a program product, and belongs to the technical field of vehicle intelligent control. The method comprises the following steps: in response to vehicle starting, acquiring navigation information of a vehicle, and determining a first oxygen content and a second oxygen content based on the navigation information; under the condition that the first oxygen content is smaller than the second oxygen content, a first difference value is determined, a first duration is determined based on the navigation information, and the first duration is the duration needed by the vehicle to arrive at a navigation destination from a navigation starting place; determining a corresponding oxygen content change rate from the navigation starting place to the navigation destination based on the first difference value and the first duration; and controlling oxygen content adjusting equipment of the vehicle to adjust the oxygen content in the vehicle according to the oxygen content change rate. According to the invention, passengers can be effectively helped to gradually adapt to the low-oxygen environment in the vehicle driving process.

The invention belongs to the field of semiconductor materials, and discloses a method for preferentially growing an epsilon-phase gallium oxide epitaxial film through oxygen flow regulation and control. The preparation method comprises the following steps: cleaning a sapphire substrate, and putting the sapphire substrate into a cavity of a metal organic chemical vapor deposition system; setting air pressure in the reaction cavity, introducing carrier gas, raising the temperature to a first preset temperature, introducing first preset high-flow oxygen, and entering a substrate high-oxygen preheating stage; raising the temperature to a second preset temperature, opening the gallium source, introducing second preset low-flow oxygen, and entering an epitaxial low-oxygen growth stage; closing the gallium source, introducing third preset high-flow oxygen, and entering an in-situ high-oxygen annealing stage; and after annealing is finished, recovering normal pressure, cooling to room temperature, and taking out to obtain the epsilon-phase gallium oxide epitaxial film. The pure phase property and the crystal quality of the epsilon-phase gallium oxide epitaxial film are improved in an oxygen flow regulation and control mode, and a way is laid for subsequent preparation of electronic and power devices.

The invention discloses a dehydration device and a dehydration method for saturated archaeological wood, and belongs to the technical field of wood cultural relic protection. Comprising a closed storage module used for storing saturated archaeological wood to be dehydrated in a sealed mode, and the closed storage module is provided with a humidity control module, a temperature control module and an oxygen content control module which are used for controlling the humidity, the temperature and the oxygen content in the closed storage module. And the closed storage module is provided with a monitoring module for monitoring an image of the saturated archaeological wood in the closed storage module. In the dehydration process of the saturated archaeological wood, the humidity and temperature in the closed storage module are controlled, so that the saturated archaeological wood is slowly and stably dehydrated under the low-temperature and low-oxygen conditions, and the deformation and mould conditions of the saturated archaeological wood in the dehydration process are mastered in real time through the monitoring module; therefore, technical parameters such as humidity, temperature and oxygen content are dynamically fed back and regulated, and the safety, stability and effectiveness of the wooden cultural relics in the dehydration process are guaranteed.

The invention provides a method for inhibiting sludge bulking through hypoxia-anoxic intermittent aeration. The method comprises the following steps: inoculating activated sludge into a sequencing batch reactor, introducing sewage to be treated, mixing, and carrying out intermittent aeration treatment; wherein the intermittent aeration treatment comprises at least one cycle formed by alternation of a low-oxygen treatment time period and an anoxic treatment time period; and in the low-oxygen treatment period, the dissolved oxygen concentration in the reactor is controlled to be higher than that in the anoxic treatment period through aeration. According to the method, through low-oxygen-oxygen-deficiency alternate environment regulation and control, efficient nitrification and denitrification are achieved, meanwhile, filamentous bacterium growth is selectively inhibited, flora structure optimization is promoted, the sludge settling performance is rapidly recovered, the system denitrification efficiency is improved, and the method has the advantages of being simple in process, environmentally friendly and low in operation cost.

The invention discloses a titanium alloy with high strength, high plasticity and toughness and a weldable structure. The titanium alloy is a Ti-Al-Mo-V-Cr-Zr series beta-rich type two-phase titanium alloy. According to the titanium alloy, the composition of the titanium alloy is controlled, the synergistic effect of high-strength contribution of Al and Mo, plasticity and toughness guarantee of V and Nb, structure optimization of Cr and Zr and low-oxygen cleanliness control is exerted, the multi-performance balanced type high-strength, high-plasticity and high-toughness weldable structure titanium alloy is obtained, and after heat treatment, the tensile strength Rm of the titanium alloy is larger than or equal to 1100 MPa, the ductility A of the titanium alloy is larger than or equal to 15%, the fracture toughness KIC of the titanium alloy is larger than or equal to 80 MPa.m < 1 / 2 >, and the impact toughness KV of the titanium alloy is larger than or equal to 40 J; and the welding seam strength matching coefficient is 0.9 or above, collaborative optimization of high strength, high plasticity and toughness, weldability and environmental adaptability is achieved, and therefore the structural mass is reduced, the service life is prolonged, integrated manufacturing is facilitated, and the high-strength and high-toughness alloy is suitable for key components in the industrial field and extreme working condition engineering scenes.

The invention discloses a low-oxygen-content barium fluoride continuous vacuum distillation purification device and method, and relates to the technical field of barium fluoride purification, the device comprises a vacuum tower, the top surface of the vacuum tower is hermetically connected with a sealing cover, the center position of the top surface of the sealing cover is provided with a vacuumizing mechanism, and the inner side of the sealing cover is provided with a continuous feeding mechanism; a heating mechanism is arranged in the middle of the inner cavity of the vacuum tower; the vacuum pumping mechanism is arranged and used for controlling the continuous feeding mechanism and the heating mechanism while keeping the vacuum degree of the vacuum tower, so that the continuous feeding mechanism controls the continuous feeding speed of barium fluoride based on the barium fluoride distillation and purification speed of the heating mechanism, and the feeding accuracy of barium fluoride is guaranteed.

The application provides a low-oxygen PMZ4020Nb ferritic stainless steel water atomization powder and a preparation method thereof, and belongs to the technical field of powder metallurgy. According to the weight percentage, the chemical components of the powder include C≤0.02%, Cr 16.5-17.5%, Mo 0.9-1.1%, Nb 0.4-0.6%, Si 0.7-2.2%, Mn≤0.3%, P≤0.03%, S≤0.02%, and the balance of Fe and inevitable impurities. The oxygen content of the powder is ≤1200ppm, wherein the free oxygen content is ≤300ppm, and the combined oxygen content is ≤900ppm. The particle size distribution of the powder is that the proportion of particles with a size of-200 mesh is ≥90%, and the proportion of particles with a size of-300 mesh is ≥65%. The loose bulk density of the powder is 2.9-3.1g / cm3, and the flowability is ≥25s / 50g. The micro-morphology of the powder is spherical, and the sphericity is ≥0.85. The low-oxygen PMZ4020Nb ferritic stainless steel water atomization powder and the preparation method thereof have excellent corrosion resistance, low oxygen content, excellent comprehensive powder performance, process stability and scalability.

This invention belongs to the field of semiconductor optoelectronic device manufacturing technology and discloses a multi-stage annealing process for ITO thin films, including the following steps: Step 1: Under high vacuum protection, the furnace temperature is raised from room temperature to a first temperature T1 and held for a first time; Step 2: The furnace temperature is raised to a higher second temperature T2 and held for a second time, without the need for oxygen introduction during the second holding stage; Step 3: While maintaining the second temperature T2, a third holding stage is performed, and oxygen is introduced during the third holding stage; Step 4: A controllable cooling process is performed, which includes at least a slow cooling stage under the oxygen atmosphere and a rapid cooling stage under an inert gas or extremely low oxygen concentration atmosphere. This invention achieves precise staged control of the ITO thin film crystallization process, oxygen vacancy filling, and interfacial reactions by precisely controlling the oxygen partial pressure and cooling rate at different temperature stages.

The present invention provides new devices, systems, and methods for delivering enriched oxygen to recipients (e.g., chronically ill patients, such as COPD patients). One aspect is a more efficient portable oxygen concentrator that is configured to deliver an enriched oxygen airflow having a significantly lower overall oxygen concentration and greater overall volume administered as compared to currently marketed or known portable oxygen concentrators. Administering the lower oxygen concentration at higher volumes allows for the present portable oxygen concentrators to deliver an equivalent number of moles of oxygen as administered by traditional portable concentrators while increasing the efficiency of the system and the ability of the system to maintain the therapeutic level of oxygen concentration for a longer period.

The invention discloses an environment simulation human body metabolism cabin oxygen concentration control method which comprises the following steps: eluting oxygen through an oxygen scrubber system so as to reduce the oxygen concentration in air, and then inputting treated gas into a buffer cavity; the first gas pressure sensor collects gas pressure data in the pressurizing box so as to monitor the current gas pressure level; the low-oxygen air in the buffering cavity is pumped into the pressurizing box through the pressurizing pump, so that the air pressure is increased; the pressurization controller adjusts the pumping rate according to the air pressure difference to ensure that the air pressure reaches a preset value; the second gas pressure sensor collects gas pressure data of the metabolism cabin and compares the gas pressure data with the data of the first gas pressure sensor; if the air pressure meets the requirement, the low-oxygen air in the pressurizing box is input into the metabolism cabin; and the second gas pressure sensor continues to collect the gas pressure data in the metabolism cabin to ensure that the gas pressure is maintained at a proper level.

The embodiment of the present application provides a kind of N type TOPCon cell front silver aluminum paste and its preparation method and cell, wherein, the N type TOPCon cell front silver aluminum paste provided in the embodiment of the present application includes aluminum powder, silver powder, nano alloy powder, organic binder, glass powder and organic additive, wherein the nano alloy powder is one or more of nano silver aluminum alloy powder, nano aluminum boron alloy powder and nano aluminum silicon alloy powder.In nano silver aluminum alloy powder, nano aluminum boron alloy powder and nano aluminum silicon alloy powder, all have the characteristics of nano size particle size, high tap density, low oxygen content and high activity, so that the front silver aluminum paste added with the nano alloy powder can quickly form a good alloy with silicon at a lower sintering temperature, reduce the contact resistivity of front silver aluminum fine grid and cell, not only avoid the appearance of top needle print during EL test, but also improve the filling of cell and the efficiency of cell.