Blueshifts of luminescence observed in type-II heterostructures are quantitatively examined in terms of a self-consistent approach including excitonic effects. This analysis shows that the main contribution to the blueshift originates from the well region rather than the variation of triangular potentials formed in the barrier region. The power law for the blueshift, ΔEPL ∝ Plaserm, from m = 1/...

In this study, the general transport equation was subjected to discretization by using the central difference, upwind, hybrid, power-law, exponential scheme and QUICK scheme methods and then solved by using a program prepared in Delphi programming software. In the solution, three different grid systems of 80x100, 160x200 and 320x400 from nodal points were used. The numerical results obtained fo...

This document describes numerical solutions to the 4-order moment equation for scintillation under strong scatter conditions. It is well known that scintillation depends on the parameters that describe the structure size distribution, and the Fresnel radius. However, in an unconstrained fixed power-law environment, the theory can be formulated in terms of a single parameter. In effect, differen...

Two-dimensional fronts and coarsening dynamics with a t{1/2} power law are analyzed experimentally and theoretically in a nonlinear optical system of a sodium vapor cell with single-mirror feedback. Modifications of the t{1/2} power law are observed in the vicinity of a modulational instability leading to the formation of spatial solitons of different sizes. The experimental and numerical obser...

We study the photoluminescence spectra excited at an edge side of n-InP slabs and observed from the broadside. In a moderately doped sample the intensity drops off as a power-law function of the distance from the excitation — up to several millimeters — with no change in the spectral shape.The hole distribution is described by a stationary Lévy-flight process over more than two orders of magnit...

A rolling-sphere viscometer (RSV) was constructed and evaluated for monitoring apparent viscosit~'es of fermentation broths in sha'ke flasks or test tubes. The apparatus was calibrated by measuring translational velocities of magnetic stainless ste.el spheres (0.16-0.95 em diameter) rolling in N~wto­ nian viscosity standards (50-12.500 mPa's) on surfaces inclined 20° to 70°. The method was appl...