The doublet structure of the 1s-exciton of simple cubic thallous chloride is quantitatively explained as due to coulombic and exchange interaction, which leads to intra- and intervalley scattering between K=0 excitons Air Max 90 Og
formed of electron-hole pairs at non-equivalent X-points of the Brillouin-zone.
Two practical branch and bound algorithms for determining minimal and near-minimal phylogenetic trees from protein sequence data are presented. A mathematical description and analysis of phylogenetic trees introduces these algorithms. A comment of efficiency and fine tuning completes the paper. An example is cited where computer time was reduced Air Max Thea Womens
from an estimated 55 days for a total search, to just under 5 minutes.
We will characterize all graphs that have the property that the graph and its complement are minimal even pair free. This characterization allows a new formulation of the Strong Perfect Graph Conjecture.
Erbium is a lanthanide ion with unique electronic and optical properties. In its trivalent state it is composed of an incompletely filled 4f inner shell and two closed outer shells. By employing these properties in specific material systems, Er can be used to probe point defects, oxygen, OH, Er, radiation defects, network structure, excitons, optical density of states, optical modes, and photonic bandstructure.