Dislocation motion governs the strength and ductility of metals, and the Peierls stress (σp) quantifies dislocation mobility. σp measurements carry substantial uncertainty in face-centered cubic (fcc) metals, and σp values can differ by up to two orders of magnitude. We perform first-principles simulations based on orbital-free density functional theory (OFDFT) to calculate the most accurate cu...

We thank the authors of Ref. [1] for their comments and interest in our work [2–6]. We agree that the emission of shear loops on one single shear plane cannot lead to void growth. However, our simulations suggest that coordinated shear on non-parallel planes can lead to void growth/shrinkage [3–5]. Detailed descriptions of this process are still being worked out and represent an exciting area f...

BACKGROUND The defect structure of organic materials is important as it plays a major role in their crystal growth properties. It also can play a subcritical role in "hot-spot" detonation processes of energetics and one such energetic is cyclotetramethylene-tetranitramine, in the commonly used beta form (β-HMX). RESULTS The as-grown crystals grown by evaporation from acetone show prismatic, t...

Seventy temporomandibular joint arthrograms of 49 patients with symptoms of internal joint derangement were reviewed. Twenty-three of these arthrograms (33%) were abnormal but atypical for anteriorly dislocated meniscus. The lower temporomandibular joint space had a well-defined edge located inferiorly, which was attributed to pressure from a sideways-dislocated meniscus. We called this appeara...

The growth of spiral mounds containing a screw dislocation is compared to the growth of wedding cakes by two-dimensional nucleation. Using phase field simulations and homoepitaxial growth experiments on the Pt(111) surface we show that both structures attain the same large scale shape when a significant step-edge barrier suppresses interlayer transport. The higher vertical growth rate of the sp...

This thesis is concerned with how grammar determines the phonological consequence of syntactic dislocation. It centers on a hypothesis regarding the linearization of movement chains the Edge Condition on Copy Deletion, eventually named the Edge Condition in the last chapter, when it receives its final formulation. The empirical phenomena under investigation include (i) predicate cleft construct...

This paper presents a fast algorithm for corner detection based on the observation that the total curvature of the grey-level image is proportional to the second order directional derivative in the direction tangential to edge normal, and inversely proportional to the edge strength (norm of the edge normal). This algorithm simply takes the difference of the second tangential derivative with the...

One way to assess the validity of elasticity is with method atomic simulations. Molecular statics (MS) simulations are performed study interactions between H and edge dislocations in bcc iron using embedded-atom-method potential for a Fe-H system. The nature H-dislocation can be investigated examined. We show that sites strong binding energy found at dislocation core, as well slip plane, sugges...