A Revised DLA Model for Simulation of Frost Formation and Growth
A revised diffusion limited aggregation (DLA) model based on the heat balance and mass balance is proposed. The computational simulation is carried out and compared with experiment data. The results indicate that revised DLA model can simulate the process of dendrite-type frost crystals formation and growth. The simulated frost structure agree well with the experimental images. The density of frost calculated by revised DLA is accuracy which can be used to forecast the frost growth time and thickness.
In a study of the relationships between vegetation and environment in North Snowdonian grasslands, 166 quadrats on 10 altitudinal transects were analysed with Detrended Correspondence Analysis, Detrended Canonical Correspond- ence Analysis and Fuzzy Set Ordination. These techniques provide consistent results. DCCA and FSO, both using floris- tic community data and environmental information, simplify the procedure of vegetation-environment analysis. FSO analy- ses and synthesizes ecological information; it may yield more reasonable and interpretable results.