240results about "Diffusion analysis" patented technology

The invention provides an intrinsic solid-state ion diffusion coefficient test method and device based on optical imaging, and relates to the technical field of solid-state ion test.The method comprises the steps that a test sample is pretreated; carrying out a photoelectric test on the test sample; placing the electrochemical cell in an optical imaging system, connecting the electrochemical cell with an electrical testing system, applying a constant voltage deviating from a steady state to the monodisperse electrode plate, collecting the real-time change condition of the material under the modulation of the constant voltage in real time through an industrial camera, and outputting relational data of optical intensity and time; analyzing the diffusion path through in-situ characterization equipment, and obtaining an ion diffusion path corresponding to the to-be-detected ion battery electrode material particles in combination with dynamic information provided by an optical imaging system; and determining the characteristic time according to the relational data of the optical intensity and the time, and determining the intrinsic solid ion diffusion coefficient corresponding to the test sample by combining the characteristic time and the ion diffusion path corresponding to the to-be-tested ion battery electrode material particles.

The invention relates to the technical field of environment monitoring, in particular to an intelligent digital rural environment monitoring system and method based on big data, and the system comprises a layered water potential collection module, a gradient reverse correction module, a path inversion modeling module and a multi-dimensional diffusion modeling module, and the layered water potential collection module calculates and generates rural soil environment monitoring data; the rural soil environment monitoring data comprises layered soil water potential distribution, soil water content gradient and a soil conductivity characteristic value, and the soil water potential abnormal flow data comprises a vertical water potential difference value, an abnormal water flow direction vector and a water flow intensity grade; the moisture permeation path distribution diagram comprises a permeation path distribution structure, a soil water potential accumulation interval and a water flow propagation direction identifier, and the diffusion boundary space model comprises a pollutant diffusion boundary range, a moisture transverse migration region and multi-dimensional diffusion rate distribution. According to the scheme, the abnormal distribution range, the duration time and the development trend are quantitatively described, and the research and judgment accuracy of the abnormal penetration and diffusion process is improved.

The invention relates to the technical field of pollutant monitoring, in particular to an industrial solid waste blending combustion pollutant intelligent monitoring system which comprises a data fusion module, a diffusion judgment module, a concentration prediction module, a risk monitoring module and an early warning distribution module, and the trend of particulate matter and gas monitoring data is analyzed based on a blending combustion reaction furnace outlet and a smoke exhaust pipeline section. According to the invention, through combined processing of multi-point time sequence monitoring data, various pollutants and environmental parameters are collected in real time, precise spatial partitioning of a monitoring object, coupling analysis based on meteorological factors and spatial diffusion characteristics, dynamic identification of response differences of pollutants in each area of a factory, and through extraction of a concentration change interval and a risk trend signal, a real-time monitoring result is obtained. According to the method, emission risk types are subdivided, graded intervention information is generated, the response speed and the judgment capability of abnormal states of pollutants under complex environment disturbance are improved, dynamic adaptation and detailed management and control of an intelligent monitoring system are promoted, and high-reliability decision making of emission control in various scenes of a plant area is further supported.

The invention relates to the field of pollutant monitoring, in particular to an indoor decoration harmful substance monitoring and early warning method and system based on multi-sensor analysis. The method comprises the following steps that decoration whole-process parameter collection is carried out based on multiple sensor nodes, regional parameter distribution fitting is carried out, and an all-weather monitoring reference database is constructed; performing air pollutant identification marking on the all-weather monitoring reference database, and performing multi-time-point concentration change evolution analysis to obtain a multi-time-point concentration distribution evolution model; carrying out dynamic pollutant diffusion mining on the multi-time-point concentration distribution evolution model, carrying out combined pollution evaluation calculation, and constructing a multi-pollutant combined diffusion risk chain; dynamic interpolation modeling is carried out on the multi-time-point concentration distribution evolution model, micro-scale space-time disturbance reconstruction is carried out, and a pedestrian disturbance space-time diffusion model is constructed. According to the invention, through accurate and efficient risk assessment of indoor decoration harmful substances, dynamic early warning is carried out, and the safety of indoor decoration is improved.

The invention provides a rapid source tracing method and system for a pollution source based on dual unmanned aerial vehicle cooperative gradient detection, and belongs to the technical field of environment monitoring and unmanned aerial vehicle application, and the method comprises the steps: initializing system parameters; deploying the first unmanned aerial vehicle to hover at an initial position, and measuring an atmospheric pollutant concentration value at the initial position and recording the atmospheric pollutant concentration value as a first concentration value; the second unmanned aerial vehicle is controlled to fly around, and the pollutant concentration value is measured and recorded as a second concentration value; calculating a pollutant concentration gradient value; based on the concentration gradient value, the direction with the maximum atmospheric pollutant concentration gradient in the whole-cycle range of 0-360 degrees is determined and recorded as the maximum gradient direction; the second unmanned aerial vehicle is controlled to move to the intersection point position of the maximum gradient direction and the fly-around circumference for hovering; the first unmanned aerial vehicle is controlled to fly around, and the concentration gradient measurement and maximum gradient direction determination process is repeated; and alternately executing the operation. Through the working mode that the two unmanned aerial vehicles alternately fly around and hover, rapid and efficient pollution source positioning is achieved.

The invention relates to the technical field of pollutant detection, in particular to a multi-medium new pollutant-oriented accurate detection method and system, and the method comprises the steps: setting a plurality of detection positions around a plant area, collecting the PFAS concentration, correcting the concentration based on the distance between the detection positions and the plant area and the relative direction, and combining the concentration change difference between the detection positions, according to the method, migration rates in corresponding directions are obtained by using correlation conditions of different detection positions and correlation of concentrations, a first migration degree and a second migration degree are calculated by combining distance and concentration differences of the detection positions, and real migration parameters are calculated by combining component content change conditions in PFAS, the first migration degree and the second migration degree. And correcting the concentration of the related detection position by using the real migration parameter to obtain other source performance parameters, thereby carrying out pollution alarm. According to the invention, the precision of pollutant detection is improved, and effective pollution prediction and control can be carried out in a larger range.

The application discloses a testing device and testing method for hydrogen isotope permeation parameters of fusion reactor application materials, relates to material testing technology in the hydrogen field, and belongs to the field of material testing technology in the hydrogen field. The testing device for hydrogen isotope permeation parameters of fusion reactor application materials comprises the following: a membrane sample is installed in a membrane testing cavity to divide the membrane testing cavity into a gas inlet sub-cavity and a permeation sub-cavity; a gas inlet tank is selectively communicated with the gas inlet sub-cavity to supply testing gas; a collecting tank is selectively communicated with the permeation sub-cavity to collect outflowing gas; a vacuum pumping structure is used for pumping the gas inlet sub-cavity and the permeation sub-cavity; a heating structure is used for heating the gas inlet sub-cavity and the permeation sub-cavity; a high-resolution mass spectrometer is selectively communicated with the permeation sub-cavity, and gas selectively flows into the high-resolution mass spectrometer. The testing device for hydrogen isotope permeation parameters of fusion reactor application materials can control the gas pressure and temperature in the two sub-cavities respectively, thereby accurately determining the hydrogen isotope permeation parameters of the materials, and the precision is high, and the data resolution is excellent.

The invention relates to the technical field of air pollution source tracing, and discloses an unmanned aerial vehicle system and method for air pollution source tracing. The method comprises the following steps: collecting gas concentration distribution data of different spatial positions of a target area, and synchronously obtaining a meteorological parameter data set; determining a plurality of pollution diffusion stability factors based on the spatial distribution characteristics of the gas concentration distribution data and the meteorological parameter data set, and constructing an atmospheric pollution traceability spatial model; generating a pollution source search strategy of the unmanned aerial vehicle cluster based on the model, and dynamically adjusting the strategy according to gas concentration distribution data collected in real time; each unmanned aerial vehicle independently generates a local traceability decision by combining the environment characteristic data of the unmanned aerial vehicle and the adjacent unmanned aerial vehicle, and a collaborative decision result is obtained after consistency adjustment of a collaborative decision mechanism; the pollution source tracing response amount is determined according to the pollution source search strategy and the collaborative decision result, the pollution source positioning instruction is executed when the response amount exceeds the preset threshold value, and the comprehensiveness, accuracy and efficiency of pollution source tracing can be improved.

The invention discloses a multifunctional testing device and method for hydrate exploitation and CO2 multiphase sealing, the device comprises an experiment kettle for testing reaction, the experiment kettle is respectively connected with a confining pressure system, a vacuumizing system, a gas injection system, a CO2 injection system, a supercritical CO2 injection system, a liquid injection system and a permeation and diffusion characteristic testing system. The device is high in measurement precision, reliable in performance and high in practicability, can meet the requirements of methane hydrate layered mining simulation and carbon dioxide multi-phase storage multifunctional testing under the coupling effect of different working conditions of real simulation ocean working conditions, and can provide important technical support for commercial development of methane hydrate reservoirs and realization of efficient carbon dioxide storage.

The application discloses a recycled concrete chloride ion diffusion coefficient prediction model based on pore structure random fractal characteristics and a construction method and application thereof, relates to the technical field of a recycled concrete chloride ion effective diffusion coefficient prediction model construction, and provides the recycled concrete chloride ion diffusion coefficient prediction model, studies transmission channels influencing recycled concrete chloride ion transmission on a mesoscopic scale, and constructs the above model on a macroscopic scale based on the mesoscopic transmission channels. The model analyzes the recycled concrete chloride ion diffusion performance on multiple scales from the mesoscopic scale to the macroscopic scale, can more accurately predict the chloride ion effective diffusion coefficient according to pore structure related data of a cement-based material, and provides reference and guidance for durability research of the recycled concrete.

The invention discloses a sandy gravel stratum grouting diffusion simulation system and method, and relates to the technical field of grouting simulation, the system comprises a test mold, a latex film is attached to the inner wall surface of the test mold, the test mold is filled with a sandy gravel material, and the bottom of the test mold is connected with a slurry storage barrel through a grouting pipe; a plurality of resistive film pressure sensors are arranged between the inner wall surface of the test mold and the outer wall surface of the latex film, and the resistive film pressure sensors collect pressure data in the slurry diffusion process in real time in the grouting process; the sandy gravel stratum environment of an actual engineering site is truly restored through the test mold and the flexible film, and the resistive film pressure sensor is used for collecting pressure signals in the slurry diffusion process in real time when the sandy gravel stratum is grouted; diffusion characteristics of grout at different time in the grouting process and distribution characteristics of grouting pressure at different positions in a stratum are obtained through data analysis, and a theoretical basis is provided for actual construction through data fitting.

The invention provides a decision-making method and system for the influence of water and sand linkage above a slope on the erosion amount below the slope. The system comprises an experiment control unit, an REE element layout unit, a dynamic monitoring network unit and a data acquisition and analysis unit. The experiment control unit comprises a parameterization experiment design module and a process sample dynamic sampling module, and the REE element laying unit comprises a layering marking module and a tracer agent selection and stability control module; the method not only objectively describes the temporal and spatial change rule of relative erosion amounts of different parts of the slope in the erosion occurrence process, but also can continuously analyze the influence of water and sand coming from the upper part of a certain section of the slope on the erosion process below, thereby dynamically judging and measuring the slope sediment source and analyzing the influence of water and sand linkage above on the erosion process below. The purpose of monitoring the sediment source and the soil erosion amount of different terrain parts is achieved.

The invention discloses a method and a device for testing heavy metal migration of solid waste concrete in flowing water, and belongs to the technical field of testing of heavy metal migration capability of solid waste concrete. The testing device comprises a through-flow pipeline, a flow regulating valve, a flow meter, a temperature control water tank, a water pump, a hose, a reducer union and other components, and can simulate the scouring action in a flowing water environment, and the testing method comprises the following steps: putting a solid waste concrete sample into the through-flow pipeline, controlling the flow rate, temperature and time, and using different extracting agents. And a reliable evaluation means is provided for determining the heavy metal leaching amount of the solid waste concrete in flowing water with different parameters. Compared with an existing still water testing method, the method has the advantages that the actual site condition is better simulated, the blank of heavy metal leaching of the solid waste concrete in the flowing water environment is filled, and the method can be widely applied to heavy metal migration evaluation and related research of the solid waste concrete in environmental engineering.

The invention relates to a hydrogen refueling station inspection robot hydrogen leakage degree quantification method, belongs to the technical field of gas leakage detection, and solves the problems that existing hydrogen leakage quantification is poor in real-time performance and inaccurate in quantification result. The method comprises the steps that when the inspection robot detects that the hydrogen volume fraction exceeds a preset threshold value, a current position serves as an initial point position, and moving and sampling are carried out multiple times in the determined hydrogen leakage source direction; based on the sampling data of each point location, constructing a corresponding local hydrogen concentration field and determining the position of a hydrogen leakage source; based on the local hydrogen concentration field closest to the hydrogen leakage source, hydrogen leakage degree quantification parameters are obtained; obtaining a hydrogen leakage degree quantized value based on the hydrogen leakage degree quantized parameter; and obtaining a hydrogen leakage risk level based on the hydrogen leakage degree quantized value and a preset leakage risk level threshold interval.

The invention discloses an anti-condensation method for a closed cavity with a ventilation valve, and the method comprises the following steps: setting a plurality of measurement points in the closed cavity to obtain a moisture diffusion coefficient of each measurement point in the closed cavity, and fitting to obtain an influence function of temperature, humidity and a humidity adjusting material on the moisture diffusion coefficient; according to the moisture diffusion coefficient and each influence function, constructing a simulation model to simulate the distribution of moisture in the closed cavity; acquiring internal temperature and humidity and external environment information of the closed cavity; obtaining condensation conditions according to the internal temperature, humidity and external environment information of the closed cavity in combination with a moisture diffusion coefficient; and according to the moisture distribution and condensation conditions in combination with the simulation model, obtaining the use amount and position distribution of the anti-condensation humidity adjusting material. Condensation prevention of the closed cavity with the ventilation valve is achieved.

The invention discloses a method for evaluating an irrigation salt control effect in a soil freezing and thawing process. The method comprises the following steps: sampling on site to obtain a dielectric constant, conductivity and temperature of soil; the conductivity is converted into solute concentration, the dielectric constant is converted into volumetric moisture content and input into a numerical model, and the temperature is directly input into the numerical model for calculation; the numerical model calculates the collected data and then outputs corresponding numerical values of the concentrations and the volumetric water contents at different time and different depths; the output numerical value is substituted into STI for calculation, and when the STI value is positive, it is indicated that irrigation can effectively control and leach salt; when the STI value is negative, it is indicated that the salt leaching capacity of irrigation is insufficient, salt accumulation is caused, and compared with a single salt control evaluation index, STI can reflect the salt leaching and salt control effect of irrigation measures in the long-term implementation process in an all-around and multi-angle mode, so that an irrigation strategy is accurately formulated, and the optimal salt control effect is achieved.

The application provides a method, an apparatus and a device for evaluating a dynamic diffusion of natural hydrogen in rock pores. The method includes: performing, at a target pressure and a target temperature, a simulation calculation of a natural hydrogen adsorption based on a pre-constructed pore model of a rock to be evaluated, and determining an average number of hydrogen molecules adsorbed in the rock pores when the natural hydrogen is saturated at the target pressure and the target temperature; determining a natural hydrogen content, based on lithologic parameters, the average number of hydrogen molecules, the target pressure and the target temperature; adding one or more preset gases to the pre-constructed pore model, determining a loss content of the natural hydrogen, and determining a diffusion coefficient of the natural hydrogen; determining a diffusion evaluation parameter, based on the natural hydrogen content, the loss content and the diffusion coefficient.

The invention relates to a rock mass splitting test device and method based on granular slurry perfusion, the device comprises a loading mechanism and a grouting mechanism, the loading mechanism comprises an inner cavity, an outer cavity and a loading unit, a rock mass sample is arranged in the inner cavity, the loading unit is connected with the rock mass sample and the outer cavity, and the outer cavity is connected with the loading unit; wherein the loading unit comprises multiple stages of loading assemblies which are perpendicular to the surface of the rock mass sample and are arranged in a layered mode, slurry guide holes are formed in the rock mass sample, the loading unit is provided with a grouting pipeline, a grouting device of the grouting mechanism is provided with a driving assembly connected with a pump body and a slurry cavity connected with the grouting pipeline, and the grouting device is rotationally connected with the frame bodies on the two sides. According to the technical scheme, the multi-stage loading assemblies are arranged from the center of the rock mass sample to the edge layer by layer, and the number of the assemblies providing loads can be freely combined, so that the stress area acting on the surface of the rock mass sample is flexibly changed, stress areas in different shape ranges are formed, cracks in different forms are further induced to be generated, and diversified test requirements are met.

The invention discloses a hydrogen brittleness performance evaluation method for a hydrogen transport pipeline, which comprises the following steps: obtaining the average hydrogen concentration in a sample through a high-pressure hydrogen permeation test of a wafer sample, and obtaining the hydrogen concentration and hydrogen diffusion coefficient of the surface of the sample under a specific electrochemical hydrogen charging condition through an electrochemical hydrogen charging test of the wafer sample; a finite element analysis model of a target sample is established to simulate the change relation of the total amount of hydrogen atoms in the target sample along with time under the electrochemical hydrogen charging condition, and the electrochemical hydrogen charging time equivalent to the high-pressure gaseous hydrogen charging is obtained by comparing the high-pressure gaseous hydrogen charging with the electrochemical hydrogen charging. The target sample is charged with hydrogen through an electrochemical hydrogen charging method, and finally the hydrogen embrittlement performance of the target sample is obtained through a hydrogen embrittlement performance test. According to the method, simple finite element simulation and electrochemical hydrogen charging are combined, high-pressure gaseous hydrogen charging which is complex, low in efficiency and high in danger is replaced, and the detection time of the hydrogen embrittlement performance test of the hydrogen charging pipe is shortened.

The present application relates to the technical field of concrete crack repair, and particularly relates to a visual grouting diffusion device for concrete crack simulation and an application method thereof, which comprises an experimental box, a cover plate, pumping pipes in communication with the interior of the experimental box, an upper-layer crack sample and a lower-layer crack sample in the experimental box, a down-stroke cylinder on the outer wall of the cover plate, the output end of the down-stroke cylinder movably penetrating through the cover plate and being connected with the upper-layer crack sample, and a plurality of adjusting assemblies on the cover plate for adjusting the inclination angle of the upper-layer crack sample. The present application has the following advantages: the output end of the down-stroke cylinder is connected with the upper surface of the upper-layer crack sample, so that the upper-layer crack sample can be used together with the plurality of adjusting assemblies, the crack sample is moved by the output of the cylinder, the inclination adjustment of the upper-layer crack sample at multiple angles is smoothly realized, and finally the parameters of the crack sample after adjustment are detected by the auxiliary detection device, so that diversified simulation grouting experiments are realized.

This invention provides a device for measuring hydrogen concentration in soil and a method for determining hydrogen diffusion paths. The measuring device includes: a first gas stone and a second gas stone, buried in the soil; an inlet pipe and an outlet pipe, one end of the inlet pipe connected to the first gas stone and one end of the outlet pipe connected to the second gas stone; a return pump, the other end of the inlet pipe connected to the inlet of the return pump and the other end of the outlet pipe connected to the outlet of the return pump to form a circulating hydrogen circuit; and a measuring component including: a sealed bag and a hydrogen sensor, the sealed bag being connected to the inlet pipe and the hydrogen sensor placed in the sealed bag to measure the hydrogen concentration in the circulating hydrogen circuit. The hydrogen concentration obtained by the above measuring device has high accuracy.

The present application relates to the technical field of low-temperature storage tank, in particular to a kind of evaporation rate dynamic monitoring method and system for static low-temperature storage tank, by obtaining the monitoring data of different liquid level in low-temperature storage tank, monitoring data includes steam concentration data, and airflow velocity data, air pressure data and liquid level monitoring data at different sampling positions;Analysis of monitoring data, determine the steam diffusion rate under different liquid level, and combine the change of liquid level data under different liquid level, determine the influence factor of airflow disturbance on evaporation rate under different liquid level, so as to correct the initial estimated evaporation rate under different liquid level based on the influence factor of airflow disturbance on evaporation rate.The present application corrects the initial estimated evaporation rate by analyzing the influence of airflow disturbance on evaporation rate under different liquid level, effectively improves the accuracy of low-temperature storage tank evaporation rate dynamic monitoring.

The invention discloses a device and a method for testing a steam oxidation mass transfer mechanism of a metal material. The device comprises a reaction chamber, and a sample holder is arranged in the reaction chamber; the gas inlet end of the reaction chamber is simultaneously connected with an 18O2 storage piece, an inert gas storage piece, an H216O storage piece and a D218O storage piece; a first heating assembly is arranged outside the reaction chamber, a second heating assembly is arranged outside the H216O storage part, and a third heating assembly is arranged outside the D218O storage part. According to the method disclosed by the invention, an invisible ion diffusion path is converted into a detectable signal gradient through isotope labeling, and experimental verification of an oxygen ion / metal cation diffusion dominant mechanism, visual proving of a hydroxyl participation oxidation process and quantitative analysis of a dissolved oxygen effect are realized for the first time; and a direct experimental criterion is provided for optimization of the oxidation resistance of the metal material.

The invention discloses a smelting arsenic-containing wastewater early warning and monitoring method based on electrical sensing, and relates to the technical field of environmental monitoring, and the method comprises the following steps: arranging electrical sensing arrays in a wastewater discharge pipeline and a sedimentation tank, collecting reference impedance and dielectric response under a pure water condition through constant current excitation, and establishing an electrical baseline model; collecting a voltage signal in real time under a wastewater flowing working condition, comparing the voltage signal with reference impedance in the electrical reference model, and performing standardization processing and Kalman filtering drift compensation to obtain a health correction signal; and based on the health correction signal, constructing a dielectric decoupling matrix to separate multi-ion response, extracting a pure arsenic signal, predicting short-time change through a PSO-BP network, inputting a prediction signal and a flow velocity field into an electricity-flow field collaborative inversion model, solving arsenic ion concentration distribution and diffusion gradient, calculating a risk index in combination with the prediction signal, and generating an early warning grade. According to the invention, the resolution ratio and early warning real-time performance of electrical monitoring of the arsenic-containing wastewater are effectively improved.

The invention discloses an underwater crack grouting retention rate testing device, and relates to the field of grouting retention rate test.The underwater crack grouting retention rate testing device comprises a supporting assembly and a testing table top fixed to the supporting assembly, a testing box, a water supply box and a grouting box are arranged on the testing table top, and the water supply box is located on the side face of the testing box and communicates with the testing box through a water inlet pipeline; the other side of the testing box is connected with a purified water tank through a drainage pipeline, the purified water tank is communicated with the water supply tank through a water return pipeline, the grouting box is connected with the height adjusting assembly, the side face of the grouting box is connected with a grouting pipe, and the tail end of the grouting pipe is located at the testing box. (1) the height of the grouting box is adjusted through the height adjusting assembly, so that the grouting pressure is adjusted, and the retention rate under different grouting pressures can be met; (2) simulating the underground water flowing condition through a water inlet pump, and adjusting the height of the model to meet the retention rate under different underground water level conditions; and (3) recycling of water is realized by arranging a purification water tank, and the utilization rate of water resources is improved.

The invention discloses a plant disease and insect pest ecological regulation and control method based on crop volatile matter collaboration, and relates to the technical field of mineral product screening, and the method comprises the following steps: arranging a tracing release source, a smell sensing array and a meteorological acquisition point in a farmland environment, obtaining space-time diffusion data of volatile organic compounds, constructing a diffusion baseline, and obtaining a diffusion result; generating a volatile organic compound residual distribution diagram; and performing reverse diffusion calculation based on the volatile organic compound residual distribution diagram, extracting residual gradient distribution, delineating the boundary of a low-efficiency diffusion region, constructing a main structure of an odor neutralization zone, and forming a volatile organic compound flux cross-section diagram. According to the method, the volatile matter diffusion base line is constructed, the low-efficiency area is identified, reverse diffusion and boundary response are combined to realize real-time monitoring, the disease and pest emigration time window is predicted, the double-loop induction structure is deployed, the volatile matter is dynamically released by using the unmanned platform, a closed-loop ecological regulation and control mechanism is constructed, and the prevention and control accuracy and the system stability are improved; and green, efficient and sustainable agricultural prevention and control are realized.

This invention relates to a method, apparatus, and storage medium for determining the diffusion migration motion of radioactive aerosols. The method involves acquiring the total duration of an accident and the initial spatial distribution of aerosol particles; dividing the total duration into multiple time steps, dividing the containment's computational domain into multiple computational domain nodes, and dividing the aerosol particles into multiple particle size ranges; selecting a first time step and iteratively calculating the multiple computational domain nodes within the containment to obtain thermo-hydraulic parameters; performing force balance calculations on the aerosol particles to obtain their diffusion migration motion; updating the initial spatial distribution of the aerosol particles to obtain their target spatial distribution; and traversing the thermo-hydraulic parameters and target spatial distributions corresponding to multiple time steps to determine the motion result of the radioactive aerosols. This invention achieves refined spatial division, resulting in a more accurate assessment of the vapor condensation and removal rate of aerosols under containment cooling conditions.

The invention discloses a dynamic diffusion cell for oral mucosa drug delivery and a method for simulating oral mucosa drug delivery. The dynamic diffusion cell comprises a sample cell, a receiving cell and a simulation membrane, and the bottom of the sample cell is communicated with the receiving cell through the simulation membrane; one horizontal side of the sample cell is connected with a sample cell inflow pipeline, and the other side is connected with a sample cell outflow pipeline; a receiving pool inflow pipeline is arranged on the upper portion of the side wall of the receiving pool, a receiving pool outflow pipeline is arranged at the bottom of the side wall, and the receiving pool inflow pipeline and the receiving pool outflow pipeline are communicated through a liquid storage bottle and form a circulation flow path with the receiving pool. By increasing the flow mechanism of the sample pool and the receiving pool, the amount of medicine lost due to salivary secretion of oral mucosa delivered medicine is effectively evaluated, the medicine concentration difference between the sample pool and the receiving pool is increased, the real proportion of medicine cross-mucosa absorption and swallowing loss is predicted, and the correlation between an in-vitro penetration test and the in-vivo actual penetration condition is improved.

The application discloses a shale single-component gas diffusion coefficient testing device and a testing method, and specifically comprises a thermostat, an injection module, an adjusting module and a monitoring module, wherein the thermostat is internally provided with a testing module; the testing module comprises a core holder, an upstream chamber connected with the upstream of the core holder and a downstream chamber connected with the downstream of the core holder; the injection module injects gas into the upstream chamber and the downstream chamber; the adjusting module is used for adjusting the pressure of the upstream chamber and the downstream chamber; and the monitoring module is used for monitoring the pressure of the upstream and downstream of the core holder, the upstream chamber and the downstream chamber; the application adopts the bulk phase subtraction method and the Darcy formula to calculate the total flow and the Darcy flow under the near-equilibrium condition, obtains the convection flow and the diffusion flow result, realizes the testing of the shale diffusion flow under the single-component gas condition, the result is more in line with the seepage mechanics assumption condition, and the accuracy of the diffusion coefficient calculation can be ensured.

This invention discloses a flexible wall device and method for measuring the gas permeability and diffusion coefficients of unsaturated soil. It mainly consists of a gas washing device, a confining pressure-volume change system, a wet-dry cycle control system, and a gas measuring device. The wet-dry cycle control system includes a humidity controller and valves. The gas measuring device includes a top cover, a cylindrical wall, a base, an upper cavity, and a lower cavity. The top cover, cylindrical wall, and base are connected by bolts and nuts. The base outlet is connected to the gas washing device, a gas supply device, the wet-dry cycle control system, and the gas measuring device. From bottom to top, the lower cavity, the sample, the upper cavity, and the control rod are arranged between the base and the top cover. This device offers high precision, overcoming the measurement errors of gas permeability and diffusion coefficients caused by the sidewall dominant flow in rigid wall permeameters. It can measure the gas permeability, diffusion coefficient, and volume change of samples under wet-dry cycles and different stress conditions, providing a reliable measurement tool and method for assessing gas migration in unsaturated soil.