7 results about "Internal diffusion" patented technology

The invention relates to a machine learning and multi-factor coupled concrete carbonization depth prediction model establishment method. The method specifically comprises the steps of obtaining future global climate data; building a dynamic temperature and humidity coupling carbonization model; building a diffusion-reaction equation of CO2, Ca (OH) 2 and relative humidity, and correcting a CO2 diffusion coefficient; setting initial and boundary conditions of the equation; future climate data is dynamically mapped to concrete surface concentration calculation under boundary conditions, and a surface mass transfer correction coefficient equation driven by wind speed is introduced; performing space-time discretization on the equation, introducing Taylor expansion to construct a third-order precision difference format, and solving a nonlinear coupling equation set; future global climate data are input into the dynamic temperature and humidity coupling carbonization model, the surface boundary condition of the coupling carbonization model in each time and space step length is updated, the internal diffusion coefficient is corrected in real time, and the change of the carbonization depth along with time is calculated. The method provides a scientific basis for the durability design of the infrastructure, and has remarkable economic benefits and social values.

The application discloses a method for measuring internal diffusion coefficient and surface interfacial permeability of porous materials, which comprises the following steps: measuring the change of desorption amount of the porous materials under the condition of being swept by a carrier gas after adsorption equilibrium by using a zero-length column method; determining the initial time of desorption of the porous materials according to the change data of adsorbate concentration signal of the empty tube experiment under the same test condition; processing the obtained change data of desorption amount, integrating the desorption concentration with respect to time, so as to obtain the change data of the desorption mass fraction; determining the limiting mechanism of the mass transfer process of the porous materials, establishing a mass conservation equation for describing the test system of the porous materials, and obtaining a control equation for describing the change process of the desorption amount through mathematical derivation; and directly and simultaneously obtaining the internal diffusion coefficient and the surface interfacial permeability of the porous materials through calculation and fitting of the control equation obtained through derivation and the change data of the desorption amount of the porous materials measured through experiments.

The application relates to the technical field of intelligent water treatment control, and discloses a system for simulating and predicting the kinetics of the adsorption capacity of biochar, which comprises the following modules: a data acquisition module uses the Arrhenius equation to introduce a temperature correction coefficient to perform thermodynamic compensation on adsorption kinetic constants; a flow state recognition module determines a forward adsorption or reverse desorption working condition based on the Langmuir model; a resistance decoupling module calculates the mass transfer Biot number based on the double membrane theory to distinguish the liquid film and the internal diffusion resistance of the particles, and uses a physical blockage index to distinguish physical blockage and chemical saturation; a hysteresis compensation module introduces a hysteresis correction factor to correct the desorption equilibrium concentration and calculate the recovery adsorption capacity during the reverse desorption; and a service life prediction module uses a dynamic utilization rate coefficient to correct the theoretical residual capacity and generate operation and maintenance instructions. Through the resistance decoupling and hysteresis compensation mechanisms, the physical and chemical attenuation mechanisms are effectively distinguished, and the precise prediction of the adsorption breakthrough time under dynamic working conditions is realized.

To make a carbide area ratio in a work uniform while suppressing the time and energy required for heating the work when the entire work is quenched.SOLUTION: In a heating process of inductively heating a ring-shaped work W made of steel in order to quench the entire work W, a temperature-raising step for continuously raising the temperature of the work W is composed of a primary temperature-raising step S1 for raising the temperature of the work W to the Curie temperature of steel, and a secondary temperature-raising step S3 for raising the temperature of the work W to a prescribed temperature equal to or higher than a hardening temperature. Between the two temperature-raising steps S1 and S3, a thermal diffusion step S2 is performed for causing thermal diffusion in the work W by lowering the output of heating coils 2A and 2B compared with that at the time of performing the primary temperature-raising step S1.SELECTED DRAWING: Figure 3

In various embodiments, superconducting wires incorporate diffusion barriers composed of Nb alloys or Nb—Ta alloys that resist internal diffusion and provide superior mechanical strength to the wires.

In various embodiments, superconducting wires incorporate diffusion barriers composed of Nb alloys or Nb—Ta alloys that resist internal diffusion and provide superior mechanical strength to the wires.

The present application relates to a kind of removal 12 The application relates to a preparation method of an adsorbent for removing carbonyl iron and carbonyl nickel in CO tail gas and an adsorption system. The carbon nanotube is a multi-walled carbon nanotube, and the packing pore structure of the multi-walled carbon nanotube is much more developed than that of activated carbon. The developed packing pore structure is beneficial to the internal diffusion and adsorption of small molecules, and the multi-walled carbon nanotube has obvious advantages in adsorption kinetics. The adsorption capacity of carbonyl iron and carbonyl nickel can be effectively improved by using the composite material made of the multi-walled carbon nanotube and the activated carbon material.