Parameter estimating of fixed effect panel data model;

The core of the method is to prioritize the locations of corrosion occurrence along pipeline segment based on the analysis of three factors: flow effect, traditional corrosion rate and other influencing factors.

This article describes the effect of whirlpool electrical currents generated in metal wall for wiring and upper and lower reinforcement rings ofelectricd- ynamic vibrator armature upon the performance of the vibrator, several practical methods with their associated brief theory are given to eliminate or reduce bad effects of these whirlpool electrical currents.