462 results about "Low oxygen" patented technology

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 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 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 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 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.

The invention discloses a straw carbonization device based on waste heat recycling, and relates to the technical field of straw carbonization devices, the straw carbonization device comprises a separation assembly, the separation assembly comprises a sealed cabin, and springs are arranged at the positions, close to four corners, of the inner top surface of the sealed cabin. According to the straw carbonization device based on waste heat recovery and utilization, when straw is divided into blocks with uniform sizes and enters the oscillation bin, the blocky straw in the oscillation bin is punched through a plurality of flow dividing pipes, so that the blocky straw is dispersed into smaller blocks, in addition, when gas punches the oscillation bin, four springs drive the oscillation bin to oscillate back and forth, so that the straw carbonization effect is improved. In the vibration process, crushed straw falls into a conveying hopper along round holes in an inclined separation plate and finally enters a conveying pipe, the crushed straw is crushed into uniform blocks in the environment with the low oxygen content, on the premise that air is isolated, the sealed conveying advantage of extrusion forming is reserved, and the conveying efficiency is improved. And the heat conduction bottleneck of the compact material blank is avoided through low-oxygen crushing.

The invention relates to a green process for extracting natural components of pericarpium citri reticulatae with water and application of the natural components in a beverage. The process comprises the following steps: crushing and drying a dried orange peel raw material; extracting with water at 105-125 DEG C under 0.8-1.5 MPa under a low-oxygen condition to obtain a first extracting solution and first-stage residues; the residues are extracted at the temperature of 130-150 DEG C and the pressure of 1.5-2.2 MPa, and a second extracting solution is obtained; treating the second extracting solution at the temperature of 145-165 DEG C and the pressure of 1.8-2.5 MPa to obtain a low-ester pectin component containing bound flavone; mixing the first extracting solution with the low-methoxyl pectin component, and homogenizing, so that the volatile oil component is dispersed in the water phase containing the low-methoxyl pectin component; and concentrating and / or drying the obtained dispersion to obtain the pericarpium citri reticulatae extract. The extract can be used as a natural flavor additive for beverages.

The invention relates to a high-temperature viscous dust filtering and purifying system and method. The high-temperature viscous dust filtering and purifying system comprises a dust remover, a filter, a pre-spraying paint conveying system, a low-oxygen regeneration system, a gas supply system and a nitrogen system, the problems that in the prior art, the pre-spraying effect is gradually attenuated due to the fact that pre-spraying is only conducted for the first time, and a filter element is blocked after being used for a long time and fails are mainly solved. The continuous use time of the filter element is prolonged; the regeneration period of the filter element is prolonged; the workload of operators is reduced; and the regeneration energy consumption is reduced.

The invention relates to the technical field of semiconductor manufacturing, and provides a wafer material box and a wafer material box supporting frame. The wafer material box comprises a main body frame and a door plate assembly, a containing cavity is formed in the main body frame and used for containing wafers, and the main body frame is provided with an opening communicating with the containing cavity; the door plate assembly is installed on the main body frame and covers the opening, the door plate assembly comprises a plurality of shielding plates, the shielding plates are arranged in the height direction of the door plate assembly, each shielding plate can slide in the height direction of the door plate assembly to form an opening communicated with the containing cavity, and the openings are used for storing and taking wafers. According to the wafer material box provided by the embodiment of the invention, through arranging the door plate assembly composed of the plurality of shielding plates capable of independently sliding, a sealing door does not need to be wholly opened, and a local opening is formed only by lifting a single or few shielding plates corresponding to the target wafer, so that the dissipation amount and speed of inert gas in the storage and taking process are greatly reduced, and the storage and taking efficiency is improved. And the positive pressure and low oxygen concentration of the inner cavity of the material box are effectively maintained.

This invention belongs to the field of target material preparation technology, and discloses a sintering method for a yellow tungsten oxide titanium target and the yellow tungsten oxide titanium target itself. The sintering method for the yellow tungsten oxide titanium target includes the following steps: Step 1: Heating the tungsten oxide titanium target blank to 800℃ at a heating rate of 0.5-1℃ / min, with continuous oxygen flow during the process at an oxygen flow rate of 15-20L / min; Step 2: Heating from 800℃ to 1150℃-1200℃ at a heating rate of 2-3℃ / min, holding at this temperature for 1-3 hours, with continuous oxygen flow during the process at an oxygen flow rate of 40-60L / min. This invention discloses a sintering method for a yellow tungsten oxide titanium target, employing a two-stage heating approach. In the first stage of heating, a lower heating rate and lower oxygen flow rate are used to improve the density of the target material; in the second stage of heating, a higher heating rate and higher oxygen flow rate are used to avoid deactivation of tungsten trioxide, which could lead to a change in the valence of tungsten.

The utility model discloses refrigeration equipment which comprises a fresh-keeping chamber, a fresh-keeping integrated module and a suction device. A fresh-keeping space for storing food materials is formed in the fresh-keeping chamber; the fresh-keeping integrated module is arranged on the fresh-keeping chamber and comprises a packaging shell, an oxygen control film and a nitrogen control film, the oxygen control film and the nitrogen control film are fixed to the packaging shell, and the fresh-keeping chamber communicates with the outside through the oxygen control film and the nitrogen control film. The suction device communicates with the oxygen control film and is used for collecting oxygen passing through the oxygen control film and discharging the oxygen to the outside of the fresh-keeping chamber. According to the fresh-keeping device, the oxygen content in the fresh-keeping space is effectively reduced, the concentration of nitrogen is improved, a low-oxygen and high-nitrogen gas atmosphere is formed, and the fresh-keeping effect is improved.

This invention relates to the field of ferrous metallurgy technology and discloses a method for the reduction production of high-purity, low-oxygen-content sponge iron. The method includes: feeding pellets and reducing materials into a rotary kiln for preheating and forming a metallic iron shell on the surface; pulse-injecting a composite reducing liquid into a high-temperature solid-phase bed in a deep reduction zone; using a rotary encoder for feedback to perform dynamic phase-controlled injection, achieving gas-liquid linkage control and nitrogen cooling maintenance; and collecting the finished product through end-stage homogenization, cooling, and magnetic separation. Ammonia gas generated by the pyrolysis of the composite reducing liquid penetrates the metal layer for deep reduction, and a chemical shielding layer is constructed using boron-carbon bonds formed on the microporous surface of the iron matrix. This invention effectively improves the metallization rate of sponge iron, significantly inhibits secondary oxidation of the finished product during kiln exit and storage, and solves the technical problem of high and unstable residual oxygen content in sponge iron.

The invention discloses a Kluyveromyces marxianus strain and an application of the Kluyveromyces marxianus strain, and belongs to the field of synthetic biology and microorganism manufacturing. The strain has the characteristics of efficiently utilizing xylose and growing under a low-oxygen condition, and by taking the strain as a fermentation strain, the protein content of fermented straw powder is remarkably improved through the synergistic effect of the strain and cellulase under a straw powder high-solid fermentation condition. According to the yeast strain and the high-solid fermentation process thereof disclosed by the invention, the protein content of straw powder can be greatly increased, and an effective solution is provided for high-valued reutilization of straw agricultural wastes.

The present invention provides a low-oxygen vanadium carbide and a method for producing the same, which is formed by reducing the oxygen content, mixing vanadium oxide and a carbon compound, then refining the particle size by high-energy milling using a high-energy milling apparatus, followed by vacuum heat treatment and a carbonization reduction reaction.

This invention relates to the field of microbial fermentation, specifically to a method for promoting the fermentation of Bacillus atrophaeus to produce γ-polyglutamic acid (PGA) using oxygen carriers. This invention involves adding specific alkane oxygen carriers during the initial stage of γ-PGA production via Bacillus atrophaeus NWS-01 fermentation. Hexane, heptane, and hexadecane were selected as effective oxygen carriers, and the optimal single-addition concentration and optimal synergistic addition ratio of each oxygen carrier were determined. This solves the problem of limited γ-PGA yield due to low oxygen transfer efficiency in traditional fermentation processes. Specifically, adding 0.3% heptane alone achieves a γ-PGA yield of 39.4 ± 0.19 g / L, while the synergistic addition of 0.240% hexane, 0.407% heptane, and 1.014% hexadecane results in a maximum yield of 42.1 g / L, representing a 150.6% increase compared to the fermentation system without added oxygen carriers. This method is simple to operate, has high oxygen utilization, low energy consumption, and produces fewer bubbles and lower liquid shear force in the fermentation system, making it suitable for the industrial-scale aerobic high-density fermentation production of γ-PGA.

The invention discloses a preparation method of low-oxygen-content light-weight wear-resistant manganese steel, and the low-oxygen-content light-weight wear-resistant manganese steel comprises the following chemical components in percentage by mass: 0.50 to 1.30 percent of C, 0.50 to 1.00 percent of Si, 8.00 to 22.00 percent of Mn, 0.50 to 1.00 percent of Cr, 0.05 to 0.10 percent of Mo, 4.00 to 15.00 percent of Al, 0.01 to 0.03 percent of V, 0.01 to 0.03 percent of W, 0.01 to 0.03 percent of Ce, less than or equal to 0.03 percent of S, less than or equal to 0.03 percent of P and the balance of iron and inevitable impurities, the oxygen content in the steel is effectively reduced only through medium-frequency electric furnace smelting, precise control of the adding time and content of aluminum and aluminum-cerium alloy, argon blowing purification, follow-up heat treatment and other processes, meanwhile, the weight is reduced by 5.0-19.0%, and the wear resistance is improved by 25% or above.

The utility model relates to the technical field of edible mushroom processing, and discloses a sterilizing device for edible mushrooms, which comprises a bearing mechanism and a sterilizing mechanism, the sterilizing mechanism is fixedly connected inside the bearing mechanism, the sterilizing mechanism comprises a sterilizing unit and a limiting unit, the sterilizing unit is fixedly connected inside the bearing mechanism, and the limiting unit is fixedly connected inside the bearing mechanism. And the limiting unit is arranged in the degerming unit. According to the sterilization device for the edible mushrooms, through a vibration machine and a vibration head in the limiting unit, edible mushroom materials in the bearing disc vibrate in the sterilization process, the stacking and shielding state of the materials at the top and the bottom in a traditional container is broken, and irradiation of an ultraviolet sterilization lamp can be more uniform; air in the inner shell can be exhausted through the air exhauster in the sterilization unit, a low-oxygen environment is formed, on one hand, anaerobic microorganism breeding is inhibited, on the other hand, interference of air on ultraviolet diffusion is reduced, and the ultraviolet rays cover the surface of the material more evenly.

The invention relates to a method and a device for producing nitrogen in an oil-gas well, which are characterized in that air is compressed and filtered and then enters a primary deoxidation unit for treatment to obtain low-purity nitrogen with oxygen content not higher than 2%, and the low-purity nitrogen is divided into two paths for split-flow treatment: after the first path of gas flow is mixed with raw material gas, the mixed gas is conveyed to a secondary deoxidation unit for treatment; after being heated, the second path of gas flow serves as purging gas of a catalyst bed layer after the reaction of the second-stage deoxidation unit, and purging tail gas is mixed with the first path of gas flow and the raw material gas and enters the second-stage deoxidation unit to be treated; the second-stage deoxidation unit takes a catalytic oxidation reactor as a main body, and oxygen and feed gas are fully reacted in the presence of a catalyst; and after the heat of the exhaust gas is recovered, the oil-gas well nitrogen is obtained. According to the method and the device, efficient deoxidation can be achieved, the oil-gas well nitrogen with the oxygen content lower than 0.01% is prepared, the problem of catalyst bed deposition carbon under the low-oxygen condition can be avoided, and long-term safe and stable operation of the device is maintained.

The utility model belongs to the field of freshwater pond culture, and particularly relates to a freshwater pond culture aerator which comprises an L-shaped supporting plate. A mounting plate is fixedly connected to the top of the L-shaped supporting plate, a driving motor is arranged on the front face of the mounting plate, a transmission rod is fixedly connected to the output end of the driving motor, and a driving assembly is connected to one end of the transmission rod; the driving assembly comprises a toothed shaft A fixed to one end of the transmission rod, the toothed shaft A is in transmission connection with a toothed shaft B through a toothed belt, and a directional hole is formed in the toothed shaft B; through the toothed belt transmission design of a toothed shaft A and a toothed shaft B in the driving assembly, the synchronous rotation function of a stirring ring and a long oxygen conveying pipe is achieved, the problem that the oxygen dissolving efficiency is low due to the fact that stirring and oxygen conveying positions of a traditional aerator are separated is solved, the stirring ring stirs water flow to enable oxygen to be evenly diffused, and the oxygen dissolving efficiency is improved in combination with micropore release of an oxygenation head.

This invention discloses a flexible aluminum alloy conductor and its preparation method, relating to the field of metal materials technology. The raw materials of the flexible aluminum alloy conductor include, by weight percentage: A 0.005-2.198 wt%, rare earth elements 0.001-7.670 wt%, Al 90.002-99.999 wt%, and unavoidable impurities with a total content ≤0.105 wt%. The flexible aluminum alloy conductor is prepared by a process of continuous casting, hot rolling followed by rapid cooling, slow cooling with sealing, cold drawing deformation, and segmented temperature-controlled annealing under low-oxygen and nitrogen protection. Through the synergistic effect of Fe and rare earth elements, combined with strict control of Si content, the flexible aluminum alloy conductor achieves good flexibility and resistance to bending fatigue while maintaining high conductivity and strength.

The invention discloses a local atmosphere control method and application of ink-jet printing equipment, and relates to the technical field of ink-jet printing equipment, the ink-jet printing equipment comprises a bearing base table, an adjustable ink-jet assembly and a temperature, humidity, water and oxygen sensor, the top of the bearing base table is symmetrically and fixedly provided with object carrying tables, and the top of the object carrying table on the right side is symmetrically provided with positioning clamping grooves. According to the local atmosphere control method of the ink-jet printing equipment and the application, through protection of inert gases such as nitrogen and argon or a low-oxygen and low-water atmosphere environment, the influence of external air on ink droplets and the ink jet process is effectively isolated, interference of the external air on the ink droplets and film forming is effectively isolated, the printing quality and stability are improved, and the ink jet printing efficiency is improved. In addition, the ink jet head is protected from water and oxygen corrosion and impurity pollution to a certain extent, the service life of the ink jet head is prolonged, atmosphere control is achieved, meanwhile, printing and front-back and left-right movement of the ink jet head are not affected, and it is effectively guaranteed that the ink jet head keeps flexibility and precision in a full-range working area.

A breathing system that supplies air containing reduced oxygen levels includes a mask, a housing, a valve or other air flow restrictor, and one or more sensors that detect the amount of oxygen present in the system. A user breathes into the mask, after which the air is moved into the housing, and subsequently through an expandable reservoir after which the air can be re-breathed by the user. One or more sensors may be mounted to the user as well as contained within the housing. In the event that the amount of oxygen in the system's recirculated air falls below a predetermined level, the valve may be opened to allow ambient air containing higher levels of oxygen to enter the system. The system may contain a carbon dioxide scrub medium, as well as other filters to maintain desired characteristic of the air within the system.

This invention provides a heat treatment unit, a substrate processing apparatus, a heat treatment method, and a storage medium capable of simultaneously achieving both high-efficiency recovery of sublimation products and heat treatment under low-oxygen conditions. The heat treatment unit includes: a heating section that supports and heats a substrate coated with a film; a chamber having a peripheral wall and a cover, the peripheral wall surrounding the heating section, and the cover covering the heating section with a gap between the cover and the peripheral wall, thus forming a processing space on the heating section; a housing that houses the heating section and the chamber; a first gas supply section that supplies a first gas with an oxygen concentration lower than atmospheric pressure to the processing space; an exhaust section that exhausts gas from the processing space at a rate greater than the supply of the first gas; a second gas supply section that supplies a second gas with an oxygen concentration lower than atmospheric pressure to the gap between the peripheral wall and the cover; and a third gas supply section that supplies a third gas with an oxygen concentration lower than atmospheric pressure to the outside of the chamber within the housing.

The present invention relates to: a stem cell isolation kit manufacturing composition prepared with graphene dispersed therein, and a preparation method therefor, the composition enabling cell activity of stem cells to improve and blood clots to be prevented through mixing of graphene and a thermoplastic resin. The stem cell isolation kit manufactured using the stem cell isolation kit manufacturing composition comprising graphene, of the present invention, allows autologous stem cells to be activated by an environment in which biocompatible far-infrared (FIR) emission and electrical conductivity are increased, and, under hypoxic conditions, enables stem cell water amount to be increased through low oxygen permeability (water activity). In addition, the present invention is subjected to antibacterial treatment so as to provide an antibacterial effect, and can improve a platelet adsorption reduction rate through a water slip effect of the graphene composition.

The invention relates to the technical field of thermal power peak regulation unit steam-water system corrosion protection, in particular to a steam-water system full-protection double-phase oxygen adding device for a peak regulation unit, which comprises an air supply system, a demineralized water supply system and a high-pressure oxygen tank, the demineralized water supply system is communicated with the upper part of the oxygen production water tank; the bottom end of the oxygen production water tank is communicated with the upper portion of the oxygen-enriched water tank, the bottom end of the oxygen-enriched water tank is communicated with a plurality of oxygen adding points through a first oxygen supply pipeline, and an output port of the high-pressure oxygen tank is communicated with the first oxygen supply pipeline through a second oxygen supply pipeline. The device has the beneficial effects that the problems of low oxygen dissolving efficiency and unstable oxygen concentration caused by nitrogen enrichment in a traditional air oxygenation technology are solved; meanwhile, the auxiliary pure oxygen bottle serves as an oxygen source, accurate and efficient regulation and control of dissolved oxygen of the steam-water system are achieved, equipment corrosion is prevented, and the unit efficiency is improved.

The utility model provides low-oxygen type drying equipment, which relates to the technical field of drying equipment and comprises a drying box body, and a control box is arranged on the right side of the drying box body. Two water catchers are arranged in the water catching cabin, due to the fact that the whole drying process is in a full-sealed state, in a circulating system, six circulating fans are arranged, high-temperature and high-humidity gas is primarily cooled firstly, then gas containing water vapor passes through the water catchers, the water catchers are divided into the two low-temperature water catchers, and when the water catchers on the left side work, the water catchers on the right side work, the water catchers on the left side work. When the right water catcher works, the right defrosting device defrosts, and when the right water catcher works, the left defrosting device defrosts, so that the aim of rapid dehumidification is achieved through alternate circulation, color change in the wolfberry drying processing process is avoided, and the problems that when existing low-oxygen drying equipment is used, the wolfberry drying environment humidity is too high, moisture on the surfaces of wolfberries evaporates slowly, and the drying effect is poor are solved. And moisture generated in the drying process is difficult to discharge in time, so that the color of the Chinese wolfberry is easily darkened.

The invention relates to the field of semiconductor materials, in particular to a crystal pulling thermal field control method, a crystal pulling thermal field system and application. The crystal pulling thermal field control method comprises the following steps: in an equal-diameter growth stage of czochralski silicon, when the curing rate of a silicon rod is less than or equal to 30%, controlling the argon flow to be 90-120SLPM, and controlling the furnace pressure to be 800-1000Pa. According to the crystal pulling thermal field control method, in the initial stage of equal-diameter growth where the oxygen segregation effect is most sensitive, argon flow and furnace pressure are cooperatively controlled in a specific'low flow-low pressure 'window, and a process environment beneficial to oxygen volatilization instead of entering crystals is actively created. The segregation and doping of oxygen atoms to a solid-liquid interface are effectively inhibited from the aspect of dynamics, and the method is the most critical step for realizing the overall low oxygen content of the silicon rod, especially reducing the oxygen content of the head and improving the axial uniformity.

The application belongs to the technical field of food processing, and particularly relates to a fresh-keeping noodle and a preparation process thereof. The fresh-keeping noodle comprises the following preparation steps: (1) dough mixing and fermentation to obtain a primary fermented dough; (2) yeast activation, kneading of the primary fermented dough to a smooth surface, addition of activated yeast, secondary fermentation, and obtaining of a secondary fermented dough; (3) calendering, strip making, quantitative cutting, noodle boiling, and post-dipping metering packaging of the secondary fermented dough to obtain the fresh-keeping noodle. The dipping liquid comprises lactic acid, alcohol, and water. The alcohol plays a sterilization role, inhibits excessive water absorption of the noodles during the dipping process, and is beneficial to maintaining the toughness of the noodles. The lactic acid in the dipping liquid can adjust the pH and inhibit the growth of microorganisms in the noodles. The secondary fermentation consumes oxygen in the dough, forms a low-oxygen environment, inhibits the growth of spoilage bacteria, ensures the quality stability of the noodles during storage, and cooperatively improves the shelf life of the noodles.