14 results about "Oxygen diffusion coefficient" patented technology

The invention discloses a soil oxygen dynamic prediction method for precision agriculture, and belongs to the technical field of soil oxygen prediction, and the method comprises the following steps: S1, collecting key parameters of different soil depths in a research area, and S2, calculating a soil oxygen diffusion coefficient according to the key parameters of different soil depths in the research area; s3, calculating the respiration rate of the soil root system; s4, constructing a soil oxygen consumption model; and S5, carrying out iterative calculation to obtain soil oxygen concentration distribution at different moments and different depths. The method can solve the problem that the oxygen concentration of the soil is influenced by complex factors such as moisture, temperature, porosity, root respiration and microbial activity, and provides a scientific basis for precise agricultural irrigation, soil health assessment and oxygenation irrigation strategy optimization.

A semiconductor device includes: an oxide semiconductor layer extending in a first direction; a gate electrode overlapping the oxide semiconductor layer in a second direction intersecting the first direction; a gate insulating film provided between the gate electrode and the oxide semiconductor layer; a first conductive layer provided on the oxide semiconductor layer in the first direction and containing a conductive oxide; a second conductive layer provided on the first conductive layer in the first direction and containing a metal element; a first protective film in contact with a side surface of the second conductive layer; and a second protective film in contact with at least a part of a side surface or an upper surface of the first conductive layer. The first protective film and the second protective film each contain a material having an oxygen diffusion coefficient smaller than that of the second conductive layer.

The invention discloses a calculation method and system for a multiphase ceramic oxygen diffusion coefficient. The method comprises the following steps: respectively establishing a basic crystal structure and an oxygen particle model of ceramic; constructing a multiphase ceramic oxygen diffusion model by adopting an amorphization-recrystallization strategy; the mean square displacement parameters of oxygen particles (including oxygen atoms, oxygen molecules and oxygen ions) in the multiphase ceramic at each temperature and at each moment are calculated through LAMMPS software. According to molecular dynamics, an Einstein relation and an Arrhenius diffusion equation, the change rule of the oxygen diffusion coefficient in the multiphase ceramic along with the temperature is systematically obtained, so that the accurate evaluation of the oxygen diffusion behavior of the multiphase ceramic is realized. The final prediction result is accurate and reliable, and scientific basis and theoretical guidance are provided for multiphase ceramic oxygen diffusion behavior research.

A CFD-based optimization method of a fermentation tank for amino acid fermentation according to one embodiment of the present invention comprises: a first step of setting a target variable, a constraint variable, and a design variable with respect to an optimization target of at least one impeller fermentation tank; a second step of generating a three-dimensional shape for a flow area of the impeller fermentation tank under each condition of the constraint variable and the design variable according to the target variable; a third step of calculating a primary value, which is at least one of an oxygen diffusion coefficient, a liquid density, a liquid viscosity, a gas retention rate, a bubble diameter, an energy dissipation rate, and a torque, by a computational fluid dynamic analysis of the flow region on the basis of information on the three-dimensional shape; a fourth step of calculating a secondary value using the primary value, the secondary value being an oxygen transfer coefficient and a power consumption ratio (power ratio); and a fifth step of repeating the second, third, and fourth steps while changing the design variable of the first step in various ways, and finding an optimal point on the basis of a comparison value obtained by comparing secondary values before and after the change.

A carbon dioxide recovery system is for separating CO2 from a CO2 containing gas that contains CO2 through electrochemical reactions and includes an electrochemical cell in which a working electrode including a CO2 adsorbent and a counter electrode are disposed to sandwich an electrolyte. The CO2 adsorbent is configured to absorb CO2 in response to electrons being supplied from the counter electrode to the working electrode due to a voltage applied between the working electrode and the counter electrode. The electrolyte is made of a material that satisfies at least one of requirements that a dissolved oxygen concentration is 0.2 cm3 / cm3 or less and an oxygen diffusion coefficient is 5×10−7 cm−2 / s or less.

The invention relates to the technical field of sponge hafnium preparation, and provides a multistage gradient reaction furnace and method for sponge hafnium preparation, and the reaction furnace comprises a machine body, a storage cylinder, a reaction cavity, a preliminary reaction box, a cylinder body, a centrifugal mechanism and a heat recovery module. The cylinder adopts a permalloy magnetic conductive layer, an yttrium-zirconium lining, a permanent magnet array and a steel shell multi-layer composite structure, the permanent magnet array forms a radial magnetic field, the magnetic field inhibits micro-turbulence of fused magnesium chloride, the oxygen diffusion coefficient is reduced, and migration of oxygen to a grain boundary is reduced; in a temperature environment of 800-1000 DEG C, under the synergistic effect of a low-oxygen grain boundary environment and a thermal gradient effect, hafnium grains grow to form uniformly distributed radioactive state crystals; in the reaction process, high-efficiency and high-purity sponge hafnium preparation is realized through multi-stage gradient temperature control of initial reaction at 600-800 DEG C, grain growth at 800-1000 DEG C and melting separation at 1000-1100 DEG C in combination with vibration accelerated reaction and centrifugal separation of by-products.

The present application relates to a resistance change type nonvolatile memory element and a resistance change type nonvolatile memory device using the same. A resistance change type nonvolatile memory element (20) includes a first electrode (2), a second electrode (4), and a resistance change layer (3) interposed between the first electrode (2) and the second electrode (4) and reversibly changes a resistance value based on an electric signal applied between the electrodes. The resistance change layer (3) includes a first resistance change layer (3c) composed of a first metal oxide of an oxygen deficiency type formed of a first metal element and oxygen and a second resistance change layer (3d) formed of the first metal element, a second metal element different from the first metal element, and oxygen and composed of a complex oxide different in oxygen deficiency degree from the first metal oxide. The complex oxide has a smaller oxygen deficiency degree than the first metal oxide, and has a smaller oxygen diffusion coefficient at room temperature than a second metal oxide formed of the first metal element and oxygen and having an oxygen deficiency degree equal to that of the complex oxide.

This application relates to the field of cable technology, and particularly to a method for correcting heat release test data of halogen-free, low-smoke, flame-retardant cables. The method includes: acquiring original heat release data and the diameter parameters of the binding wires of the halogen-free, low-smoke, flame-retardant cable; obtaining the binding strength index based on the diameter parameters of the binding wires; subsequently obtaining the equivalent porosity of the halogen-free, low-smoke, flame-retardant cable based on the binding strength index; obtaining the oxygen diffusion coefficient based on the equivalent porosity; substituting the oxygen diffusion coefficient into a combustion rate model to obtain a combustion correction factor; and finally adjusting the peak heat release rate, peak time, and total heat release amount according to the combustion correction factor to obtain accurate final corrected data. This method provides a unified physical benchmark for test data under different binding conditions, improving the scientific rigor and comparability of the data.

The present application relates to the technical field of sponge hafnium preparation, and provides a multistage gradient reaction furnace and method for preparing sponge hafnium, the reaction furnace comprising a machine body, a storage cylinder, a reaction cavity, a preliminary reaction box, a cylinder body, a centrifugal mechanism and a heat recovery module. The cylinder body adopts a multilayer composite structure of a permalloy magnetic guide layer, yttrium-zirconium lining, permanent magnet array and steel shell. The permanent magnet array forms a radial magnetic field, which suppresses the micro-turbulence of molten magnesium chloride, reduces the oxygen diffusion coefficient and reduces the migration of oxygen to the grain boundary. In a temperature environment of 800-1000 DEG C, under the synergistic effect of a low-oxygen grain boundary environment and a thermal gradient effect, hafnium grains grow to form uniformly distributed radiation state crystals. The reaction process is controlled by multistage gradient temperature control of 600-800 DEG C preliminary reaction, 800-1000 DEG C grain growth and 1000-1100 DEG C melting separation, combined with vibration acceleration reaction and centrifugal separation of by-products, to realize efficient and high-purity sponge hafnium preparation.

A carbon dioxide recovery system is for separating CO2 from a CO2 containing gas that contains CO2 through electrochemical reactions and includes an electrochemical cell (101) in which a working electrode (102) including a CO2 adsorbent (102b) and a counter electrode (103) are disposed to sandwich an electrolyte (106). The CO2 adsorbent is configured to absorb CO2 in response to electrons being supplied from the counter electrode to the working electrode due to a voltage applied between the working electrode and the counter electrode. The electrolyte is made of a material that satisfies at least one of requirements that a dissolved oxygen concentration is 0.2 cm3 / cm3 or less and an oxygen diffusion coefficient is 5×10-7 cm-2 / s or less.

A CFD-based optimization method for a fermenter for amino acid fermentation according to an embodiment of the present invention includes: a first step of setting an objective variable, a constraint variable, and a design variable with respect to an optimization objective of at least one impeller fermenter; a second step of generating a three-dimensional shape for a flow region of the impeller fermenter for each condition of the constraint variable and the design variable according to the objective variable; a third step of calculating a primary value, which is at least one of oxygen diffusion coefficient, liquid density, liquid viscosity, gas hold-up, bubble diameter, energy dissipation rate, and torque, by computational fluid dynamics analysis for the flow region based on information about the three-dimensional shape; a fourth step of calculating secondary values, which are an oxygen transfer coefficient and a power consumption ratio (power ratio), using the primary value; and a fifth step of repeating the second, third, and fourth steps while varying the design variable of the first step in various ways, and finding an optimal point based on a comparison value obtained by comparing the secondary values before and after the variation.

This invention discloses a method for dynamic soil oxygen prediction for precision agriculture, belonging to the technical field of soil oxygen prediction. The method comprises the following steps: S1. collecting key parameters at different soil depths within a study area; S2. calculating the soil oxygen diffusion coefficient based on the key parameters at different soil depths within the study area; S3. calculating the soil root respiration rate; S4. constructing a soil oxygen consumption model; and S5. performing iterative calculations to obtain soil oxygen concentration distributions at different times and depths. This method can address the issue of soil oxygen concentration being affected by complex factors such as moisture, temperature, porosity, root respiration, and microbial activity, providing a scientific basis for precision agricultural irrigation, soil health assessment, and optimization of aeration irrigation strategies.

An experimental data fitting method for the fluorescence intensity of pressure-sensitive paint, measuring the oxygen diffusion coefficient D of the pressure-sensitive paint and the thickness H of the pressure-sensitive paint coating; establishing a partial differential equation set for the temporal and spatial variations of the oxygen molecule concentration and the excited-state fluorescence molecule concentration in the pressure-sensitive paint; establishing a partial differential equation set for the temporal and spatial variations of the relative oxygen molecule concentration and the relative fluorescence intensity in the pressure-sensitive paint; experimentally measuring the dynamic change data of the relative fluorescence intensity of the pressure-sensitive paint under a certain pressure input, establishing the partial differential equation set, obtaining the temporal and spatial distribution function of the relative fluorescence intensity and the kinetic mathematical model of the relative fluorescence intensity of the pressure-sensitive paint; fitting the kinetic mathematical model of the relative fluorescence intensity of the pressure-sensitive paint with the test measurement results to obtain the final kinetic model of the relative fluorescence intensity of the pressure-sensitive paint, and completing the experimental data fitting.

Provided is a semiconductor device occupying a small area. The semiconductor device includes a transistor and a first insulating layer. The transistor includes a first conductive layer, a second conductive layer having a region overlapping the first conductive layer via a first insulating layer, and a semiconductor layer. The second conductive layer has a first opening in a region overlapping the first conductive layer. The first insulating layer has a second opening reaching the first conductive layer in a region overlapping the first opening. The semiconductor layer is in contact with a top surface of the first conductive layer, a side surface of the first insulating layer, and a side surface of the second conductive layer in the first opening and the second opening. The first insulating layer has an oxygen diffusion coefficient at 350 DEG C of 5 * 10-12 cm2 / sec or more.