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.

In the AgNPs model, the universal soil loss equation (USLE) is used to predict the erosion of a single rainfall event, even if USLE is not suitable for this purpose. A new improvement of USLE is more suitable for predicting the erosion of events, and also provides a mechanism for calculating the impact of slope runoff on erosion, which is not available in USLE.

simple FORTRAN 77 program has implemented three published limit equilibrium slope stability analysis methods for post landslide investigation.

3D focal mechanisms is an observation tool for 3D focal mechanism symbols. The tool runs in ArcScene 9. X, a geographic information system software of ESRI. The program needs to input a GIS point data set of earthquake location, which contains the strike, tilt and tilt values of node plane of each earthquake. Other information, such as the depth and magnitude of the earthquake, may also be included in the dataset.