Dislocation slip is investigated in a metastable  titanium alloy with the Ti-23Nb-0.7Ta-2Zr0.4Si composition (at. %) by in situ straining experiments in a transmission electron microscope (TEM). Moving dislocations have a/2<111> Burgers vectors and glide in {110}, {112} or {123} planes. The mobility of screw dislocations is lowered by punctual defects and the existence of a stable and sessile ...

The title compound, C(16)H(12)O(2), contains two prop-2-yn-1-yl-oxy groups attached to a naphthalene ring system at the 1- and 6-positions. The crystal packing includes an inter-molecular C-H⋯π inter-action between a terminal ethynyl H atom and an ethynyl group on a glide-related mol-ecule and another inter-action between an O-atom-linked methyl-ene H and an ethynyl group of a different glide-r...

We investigate two mechanisms of crystallographic slip in graphene, corresponding to glide and shuffle generalized stacking faults (GSF), and compute their -curves using Sandia National Laboratories Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS). We find evidence of metastable partial dislocations for the glide GSF only. The computed values of the stable and unstable stackin...

Considering recently computed formation and migration energies of kinks on non-dissociated dislocations, we have compared the relative mobilities of glide partial and shuffle perfect dislocations in silicon. We found that the latter should be more mobile over all the available stress range, invalidating the model of a stress driven transition between shuffle and glide dislocations. We discuss s...

Atomic-scale calculations for the dynamics of the 90 partial glide dislocation in silicon are made using the effective-medium tight-binding theory. Kink formation and migration energies for the reconstructed partial dislocation are compared with experimental results for the mobility of this dislocation. The results confirm the theory that the partial moves in the dissociated state via the forma...

Crystals with spatial variations in their axes naturally evolve into cells or grains separated by sharp walls. At high temperatures, polycrystalline grains form from the melt and coarsen with time: the dislocations can both climb and glide. At low temperatures under shear the dislocations (which allow only glide) form into cell structures. We present here a mesoscale theory of dislocation motio...

This study investigates the perceptual role of several acoustic characteristics to glide generation processes affecting the consonants [t], [beta] and [eta], i.e., the vocalization of syllable-final [t] and syllable-initial [beta] into [w], and the insertion of [j] before syllable-final [eta]. Results from identification tests with synthetic speech stimuli performed on Catalan-speaking informan...

Does the visual perception of glides require a d y n a m i c representation? In our previous experiments on the visual perception of rounding, we argued against the mandatory status of dynamic representations for visual vowels. In this paper, we focus on a specifically temporal contrast between the French vowel [y] and the corresponding [ÿ] glide. Results are twofold. First: for subjects who us...

Dislocation dynamics dictate the mechanical behavior of materials. Dislocations in periodic crystalline materials have been well documented. On the contrary, dislocations in cylindrical carbon nanotubes, particularly in multiwalled carbon nanotubes (MWCNTs), remain almost unexplored. Here we report that a room temperature 1/2<0001> sessile dislocation in a MWCNT becomes highly mobile, as charac...