A hybrid molecular dynamics model has been applied for modeling impacts of Ar and decaborane clusters, with energies ranging from 25 to 1500 eV/atom, impacting Si surfaces. Crater formation, sputtering, and the shapes of craters and rims were studied. Our simulation predicts that on a Si(1 0 0), craters are nearly triangular in cross-section, with the facets directed along the close-packed (1 1...

This article provides an overview of recent developments regarding synthesis of Pd nanocrystals with well-controlled shapes in aqueous solutions. In a solution-phase synthesis, the final shape taken by a nanocrystal is determined by the twin structures of seeds and the growth rates of different crystallographic facets. Here, the maneuvering of these factors in an aqueous system to achieve shape...

We describe an algorithm which generates tetrahedral decomposition of a general solid body, whose surface is given as a collection of triangular facets. The principal idea is to modify the constraints in such a way as to make them appear in an unconstrained triangulation of the vertex set a priori. The vertex set positions are randomized to guarantee existence of a unique triangulation which sa...

We describe an algorithm which generates tetrahedral decomposition of a general solid body, whose surface is given as a collection of triangular facets. The principle idea is to modify the constraints in such a way as to make them appear in an unconstrained triangulation of the vertex set à priori. The vertex set positions are randomized to guarantee existence of a unique triangulation which sa...

Semipolar GaInN/GaN light emitting diodes (LEDs) were investigated as possible candidates for high-brightness devices even in the long wavelength regime. To combine the high material quality known from c-GaN and the advantage of a reduced piezoelectric field, the LED structures were realized on the {1101} side facets of selectively grown GaN stripes that have a triangular shape. Time-resolved a...

We have used spatially and temporally resolved cathodoluminescence CL to study the carrier recombination dynamics of InGaN quantum wells QWs grown on 0001 -oriented planar GaN and 11̄01 -oriented facets of GaN triangular prisms prepared by lateral epitaxial overgrowth in a metal-organic chemical vapor deposition system. The effects of In migration during growth on the resulting QW thickness and ...

In this paper, we extend some recent provably correct Delaunay-based meshing algorithms to the case of multi-label partitions, so that they can be applied to the generation of high-quality geometric models from labeled medical datasets. Our approach enforces watertight surface meshes free of self-intersections, and outputs surface and volume meshes of the different tissues which are consistent ...

A naive digital plane is a subset of points (x, y, z) ∈ Z3 verifying h ≤ ax+ by+ cz < h+max{|a|, |b|, |c|} where (a, b, c, h) ∈ Z4. Given a finite unstructured subset of Z3, determine whether there exists a naive digital plane containing it is called digital plane recognition. This question is rather classical in the field of digital geometry (also called discrete geometry). We suggest in this ...

Describing a surface colored model in a proper format is very meaningful to its formation by Color Rapid Prototyping. The proposed format describes the geometry of a solid by a polyhedron consisting of triangular facets, which approaches the geometry of the solid. It also uses a simple method to describe complex surface textures. It uses affine mapping from a rectangular texture image to each f...