Now showing items 41-50 of 101
High-resolution nonlinear laser spectroscopy of exciton relaxation in GaAs quantum wells
(Springer-Verlag, 1991-12)
This paper describes measurements of exciton relaxation in GaAs/AlGaAs quantum well structures based on high resolution nonlinear laser spectroscopy. The nonlinear optical measurements show that low energy excitons can be ...
Correlation free forms for nonlinear stochastic systems
(Elsevier, 1989-05-01)
An asymptotic method for analysis of nonlinear systems with wide-band and high frequency stochastic perturbation is developed. Correlation free (Ito) limiting equations are derived and a generalization of the Wong-Zakai ...
Electronic raman scattering in quantum wells: Coupled levels in tilted magnetic fields
(Elsevier, 1987)
We report on a magneto-Raman scattering investigation of free and donor-bound electrons in GaAs---AlxGa1-xAs quantum wells. For fields perpendicular to the layers, the spectra show intersubband transitions of photoexcited ...
An Accurate Re-formulation of the Wigner Function Method for Quantum Transport Modeling
(Elsevier, 1994-05)
The Wigner function is a promising method for including such effects as time dependence, self consistency, and inelastic scattering in quantum transport calculations, However, issues regarding the accuracy and consistency ...
Computing convexity properties of images on a pyramid computer
(Springer-Verlag; Springer-Verlag New York Inc., 1991-12)
We present efficient parallel algorithms for using a pyramid computer to determine convexity properties of digitized black/white pictures and labeled figures. Algorithms are presented for deciding convexity, identifying ...
Acceptor Raman scattering in GaAs-AlxGa1-xAs quantum-well structures
(Elsevier, 1987-02-02)
We report resonant Raman scattering from Be acceptors in GaAs-AlxGa1-xAs quantum well structures, grown by molecular beam epitaxy. Center- and edge-doped samples with well widths in the range 70-165 A were investigated as ...
Optimal policies for controlled Markov chains with a constraint
(Elsevier, 1985-11-15)
The time average reward for a discrete-time controlled Markov process subject to a time-average cost constraint is maximized over the class of al causal policies. Each epoch, a reward depending on the state and action, is ...
Scale and Translation Invariant Methods for Enhanced Time-Frequency Pattern Recognition
(Kluwer Academic Publishers; Springer Science+Business Media, 1998-10)
Time-frequency (t-f) analysis has clearly reached a certain maturity. One can now often provide striking visual representations of the joint time-frequency energy representation of signals. However, it has been difficult ...
Low-frequency scattering by rectangular dielectric particles
(Springer-Verlag, 1977-06)
The field scattered by a homogeneous isotropic dielectric particle illuminated by a low-frequency plane electromagnetic wave is expressed in terms of a single polarizability tensor which is a function of only the geometry ...
Simplified description of slow-in-the-average Markov walks
(Elsevier, 1991-07-01)
The averaging theory for the slow Markov walks is extended to the so called slow-in-the-average Markov processes where the jump vector takes arbitrarily large values with sufficiently small probabilities. The results ...