New lead volatilisation rate and activity data in copper mattes containing low levels of Pb were determined through high-temperature experiments. Measurements on from (Cu-Fe-S) carried out at temperatures 1200 to 1570°C by injection nitrogen into shallow baths. The concentration the melts covered a range 200–6 mg.kg−1. exhibited first order behaviour with respect Pb. deduced vapour pressure gas...

Propagation of a slip transient on fault with rate- and state-dependent friction resembles fracture whose near tip region is characterized by large departure the velocity strength from steady-state sliding. We develop solution to describe this unsteady dynamics, obtain energy G c , dissipated in overcoming strength-excursion away steady state, as function rupture v r . This opens possibility mo...