Based on an analysis of rheology and mass transport principle, a mathematical model was formulated for describing the co-extrusion and diffusion process of graded index polymer optical fiber (GI POF).

Based on the analysis of transport stream, program stream of MPEG-2 standard definition, this paper gives the principle and the plan for transforming the transport stream to VOB files.

The article explains the principle and algorism of the forecast model of public transport demand based on the maximum entropy principle.