The stochastic dynamics in molten nickel is studied by neutron scattering. The quasielastic spectrum shows two distinct components having disparate linewidths. The wave-vector dependence of the narrow component is shown to arise from incoherent scattering at low momentum transfers. In turn, the spectral half-width of the wider component shows a modulation with wave vector characteristic of cohe...

We propose a method to deduce the free energies ! and stresses " of plane surfaces and solid-liquid interfaces in elemental systems from atomistic simulations involving nonhydrostatically stressed solid phases. The method is applied to compute the temperature dependencies of ! and " for the !110" Cu surface using Monte Carlo simulations with an embedded-atom potential. Both quantities decrease ...

Abstract In this paper, the reduced strain gradient elasticity model with two characteristic lengths is proposed and presented. The a particular case of Mindlin’s first theory number material parameters generalization simplified to include different length scale parameters. have physical meaning longitudinal transverse scales. used study screw edge dislocations derive analytical solutions dislo...

A Rydberg atom embedded in a plasma can experience penetration by slowly moving electrons within its volume. The original pure Coulomb potential must now be replaced by a screened Coulomb potential which contains either a screening length Rs or a screening factor A = R −1 s . For any given discrete energy level, there is a Critical Screening Factor (CSF) Ac beyond which the energy level disappe...

The crystal growth kinetics and interfacial properties of titanium (Ti) are studied using molecular dynamics computer simulation. interactions between the Ti atoms modeled via an embedded atom method potential. First, free solidification (FSM) is used to determine melting temperature Tm at zero pressure where transition from liquid body-centered cubic occurs. From simulations with FSM, kinetic ...