We report the results of a molecular-dynamics study of the surface tension and surface profile of liquid Si and Ge (l -Si and l -Ge! and their alloys using empirical Stillinger-Weber potentials. The calculations are carried out at two temperatures slightly above the melting temperatures of Si and Ge and the alloys Si 0.8Ge 0.2 and Si 0.2Ge 0.8 . They show clear evidence of surface segregation b...

2014 The surface self-diffusion coefficient of tungsten in the region of extreme high temperatures (3 000-3 600 K) is determined from van der Mast experimental data on laser heated tips using our theory on tip evolution by capillarity forces and evaporation. In contrast to previous results at less high temperatures, the new results show a slope change in the Log Ds versus 1/T curve indicating a...

PURPOSE Patients with diabetes are often prescribed foot orthoses to help prevent foot ulcer formation. Orthotics are used to redistribute normal and shear stress. Shear stresses are not easily measurable and considered to be responsible for skin breakdown. Local elevation of skin temperature has been implicated as an early sign of impending ulceration especially in regions of high shear stress...