David Bacon

TL;DR: The second public data release (DR2) from the DECam Local Volume Exploration survey (DELVE) as mentioned in this paper consists of ∼160,000 exposures that cover >21,000 deg2 of the high-Galactic-latitude (∣b∣ > 10°) sky in four broadband optical/near-infrared filters (g, r, i, z).

TL;DR: In this paper, the cores of the prism-edge, basal-edge and screw dislocations with have been simulated in two model hcp crystals with different basal stacking-fault energy.

TL;DR: In this article, the microflow parameters of polycrystalline alpha titanium have been determined from compression tests at temperatures in the range 77 to 335 K. Specimens were tested in either annealed or prestrained conditions, and the elastic limit, micro yield stress, activation volume and activation energy were determined.

Abstract: Interaction between a moving dislocation and localized obstacles determines microstructure-induced hardening. The mechanisms and parameters of such interactions are necessary inputs to large scale dislocation dynamics modelling. We have developed a model to investigate these characteristics at the atomic level for dislocation-obstacle interactions under both static (T=OK) and dynamic (T>OK) conditions. We present results on hardening due to pinning of edge dislocations at obstacles such as voids, coherent precipitates and stacking fault tetrahedra in bcc-iron and fcc-copper at temperatures from 0 to 600K. It is demonstrated that atornic-scale simulation is required to determine the effects of stress, strain rate and temperature and that such effects cannot always be rationalized within continuum theory.

TL;DR: In this paper, the authors reconstruct the true peculiar velocity field by reducing the large statistical uncertainties associated with distance indicators such as Dn − σ relations or Tully-Fisher.