The sodium activities in aluminium in equilibrium with cryolite-alumina melt and during electrolysiswere determined by EMF with Naβ-Al<sub>2</sub>O<sub>3</sub>
In this paper,such a new lateral displacement function is proposed that the lateral flow velocity is con-tinuous at the entry and the exit of deformation zone.A
The assumption of the local equilibrium ofhydrogen distribution in metals[1]was used in themodel formerly developed[2]to describe the diffu-sion of hydrogen in