By using the method of the finite difference, the press field of static pressure thrust air bearings with pressure groove under column coordinate was stimulated.

The thermal stress profile of the elastic slot is calculated where the stress concentration is located.

After a two-year comprehensive experiment on a series ofseriously old and low-design-level 60KA soderberg reduction cell, whichproved that the electricity effciency limit of this kind of cell canreach between 93 and 95 percent, the average cell voltage is 4.