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Volume 114, Issue 14, 14 October 2013
Hybrid molecular dynamics and Monte-Carlo simulations on the deformation behavior of nanocrystalline Pd–Au are presented. A semi-grandcanonical Monte-Carlo scheme is employed during straining to allow for local relaxation by chemical equilibration and to effectively shortcut diffusional processes. Altering the balance between an imposed straining and local relaxation reveals a strong correlation of the irreversible plastic deformation and the frequency of local relaxation. Using a novel method to quantify the amount of crystal slip strain from atomistic data, it is demonstrated how plastic deformation carried by dislocations changes as a function of the local relaxation. The results indicate that conventional molecular dynamics simulations overestimate the contributions of dislocation slip to the overall plastic deformation of nanocrystalline samples.
Comment on “Collinear phase-matched terahertz-wave generation in GaP crystal using a dual-wavelength optical parametric oscillator” [J. Appl. Phys. 95, 7588 (2004)]114(2013); http://dx.doi.org/10.1063/1.4824547View Description Hide Description
The dependence of terahertz (THz)-wave power on the length of a GaP crystal used for collinear phase-matched THz-wave generation is reanalyzed, and it is found that optical losses affect the THz-wave power more strongly than that described in the above paper.