Branched nanocrystal heterostructures synthesized from CdSe and CdTe exhibit a type II band structure alignment that induces separation of charge upon photoexcitation and localizes carriers to different regions of the tetrahedral geometry. The dynamics of carrier relaxation examined with femtosecond pump-probe spectroscopy showed heterostructures having rise times and biexponential decays longe...

The asymmetric unit of the title compound, [HgBr(2)(C(5)H(4)N(2)O(2))(2)]·2H(2)O, contains one half-mol-ecule and one water mol-ecule. The Hg(II) ion, lying on a twofold rotation axis, is four-coordinated by two N atoms of pyrazine-2-carboxylic acid ligands and two bromide ions, forming a highly distorted tetrahedral geometry. In the crystal structure, inter-molecular O-H⋯O and O-H⋯N hydrogen b...

We present a new method for remeshing of triangular and tetrahedral meshes. Relative element sizes are computed from an error estimation. Then their gradient is limited in an optimal way by solving a Hamilton-Jacobi equation numerically. The new mesh is generated using smoothing-based iterations with connectivity updates (changes in topology of the mesh). The boundary nodes are projected using ...

In this paper we propose a particle-based volume rendering approach for unstructured three-dimensional tetrahedral polygon meshes. We stochastically generate millions of particles per second that are projected on the screen in real-time. In contrast to previous rendering techniques of tetrahedral volume meshes, our method does not need a prior depth sorting of geometry. Instead, the rendered im...

An adaptive hybrid prismatic/tetrahedral grid generation method is described and applied to complex geometries for diverse industrial applications. The method consists of using a surface mesh generator to triangulate the geometry to be modeled. The volume mesh is then created using prismatic and tetrahedral elements. The prisms cover the region close to each body's surface for better resolution...

low stacking fault energy face centered cubic (fcc) materials contain characteristic defect structures. stackingfault tetrahedral are one of those rare structures that occur under special experimental conditions. for the first time,stacking fault tetrahedral were observed in fe-30mn-3al-3si twinning induced plasticity (twip) steel. theirpresence resulted from a quenching heat treatment.

We present a novel method for solving the incompressible Navier-Stokes equations that more accurately handles arbitrary boundary conditions and sharp geometric features in the fluid domain. It uses a space filling tetrahedral mesh, which can be created using many well known methods, to represent the fluid domain. Examples of the method’s strengths are illustrated by free surface fluid simulatio...

Energies of four-quark systems with the tetrahedral geometry measured by the static quenched SU(2) lattice monte carlo method are analyzed by parametrizing the gluon overlap factor in the form exp(−[bsEA+ √ bsFP]), where A and P are the area and perimeter defined mainly by the positions of the four quarks, bs is the string constant in the 2-quark potentials and E,F are constants.

In the title Schiff base complex, [Zn(C(14)H(9)Br(2)FNO)(2)], the Zn(II) atom is located on a twofold rotation axis and is coordinated by two O and two N atoms from two symmetry-related bidentate Schiff base ligands in a compressed tetrahedral geometry. The bond lengths and bond angles are within normal ranges. The dihedral angle between the least-squares planes of the aromatic rings within eac...

The title compound, C(45)H(27)P, was obtained as a product of the reaction of triphenyl-methyl-enephospho-rane with one molar equivalent of 1,4-diphenyl-butadiyne in toluene. The compound was very stable under ambient conditions, but rapidly decomposed in solution when exposed to the air. The P atom is tetra-coordinated in an approximately tetrahedral geometry. The length of the C C triple bond...