IBIS model is used to describe the input, output and I / obuffer behavior characteristics of IC devices, and to simulate the interaction between buffer and on-board circuit system. The core content of IBIS model is the buffer model, because these buffers produce some simulated waveforms, so the simulator uses these waveforms to simulate the influence of transmission line and some high-speed phenomena. Specifically, Ibis describes the input and output impedances (in the form of I / V curves), rise and fall times, as well as pull-up and pull-down in different situations. Engineers can use this model to analyze Si, crosstalk, EMC and timing in the circuit system on PCB.

HYDRUS-1D model is a finite element model, which is used to simulate the one-dimensional motion of water, heat and multiple solutes in variable saturated media. The model solves Richards' saturated unsaturated water flow and Fickian based advection dispersion equations of heat and solute transport.

WOFOST is a single site simulation system developed by Wageningen University in the Netherlands. A dynamic interpretative model based on process was developed to simulate crop growth process under the influence of climate and other environmental factors (such as soil water and fertilizer), such as photosynthesis, respiration, transpiration, leaf area change, dry matter distribution and yield formation. The model can simulate crop growth process and crop yield under three conditions: sufficient water and fertilizer supply (potential growth condition), water limitation (rain fed condition) and nutrient limitation (insufficient supply of N, P, K).

The process of energy flow and material circulation in the soil vegetation atmosphere system controls the microclimate environment of vegetation growth, which has an important impact on the growth of vegetation. At the same time, the exchange of energy and water between the surface and the atmosphere determines the intensity and stability of turbulence and diffusion in the boundary layer, and controls the lower boundary conditions of the climate system such as wind speed, temperature and humidity- Vegetation atmosphere transport model is very important to study and forecast climate change, hydrological cycle and ecological environment dynamics. J. W. Deardorff put forward the concept of "big leaf", added a layer of vegetation to the land surface simulation, and began to consider the ecological hydrological process of vegetation, thus forming the prototype of SVAT model. Isba is an interaction model among soil, biosphere and atmosphere, which was proposed by J. noilhan in 1989. It is used to simulate the exchange of heat, mass and momentum between land or water surface and upper atmosphere. The model is applied to the so-called independent development model. In the coupled model, the model provides lower boundary conditions for the atmospheric numerical weather forecast model, or higher boundary conditions for the distributed hydrological model.

3dade is a FORTRAN computer program, which is used to evaluate a series of analytical solutions of the three-dimensional convection dispersion equation. The analytical solution has stable unidirectional flow in porous media with uniform flow and transport characteristics. The transport equation includes the transport of solute by convection and dispersion, as well as solute delay, first-order decay and zero order production. The 3dade code can be used to directly solve some problems, that is, centralized calculation of time and space functions as specified model parameters, and indirect (inverse) problems, in which the program estimates the selected parameters by fitting one of the specified analytical solutions.

At present, the plastic tarpaulin used in soil fumigation process has been proved to be able to penetrate into the fumigation steam and cause obvious loss to the atmosphere. New low permeability membranes are being developed to reduce fumigant emissions and improve efficacy. A fast, reliable and sensitive method is needed to measure the permeability of various membranes that may be used in new management practices. Filmpc provides a method for estimating the mass transfer coefficient (H) of fumigants in agricultural films. H is a measure of diffusion resistance. Unlike other permeability measurement methods, h is an attribute of film chemical combination, independent of the concentration gradient of the whole film. The model relies on a mass balance method, and adsorption and diffusion are carried out on the membrane. The results show that this method produces a sensitive and reproducible method for measuring membrane permeability.