Now showing items 71-80 of 169
Power limitations in BARITT devices
(Elsevier, 1976-09)
The results of a large-signal numerical simulation of the BARITT device using a single-carrier model are given to illustrate the basic transport mechanisms involved in the device. The results of existing first-order small- ...
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 ...
The effect of conjugate photoelectron impact ionization on the pre-dawn ionosphere
(Elsevier, 1973-12)
Theoretical calculations using photoelectron fluxes measured by a soft particle spectrometer on ISIS-2 as input data show that impact ionization by photoelectrons arriving from the sunlit conjugate region is insignificant ...
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 ...
Inversion of the Bloch transform in magnetic resonance imaging using asymmetric two-component inverse scattering
(IOP Publishing Ltd, 1990-02-01)
In magnetic resonance imaging, the relation between the radio-frequency modulation of the magnetic field and the desired final magnetisation state is called the Bloch transform. Selective excitation then amounts to inverting ...
Soliton dragging in discrete and distributed amplifiers
(IOP Publishing Ltd, 1993-10-01)
The authors introduce erbium-doped fibre amplifiers (EDFA) into soliton-dragging logic gates (SDLG) to improve their performance in terms of switching energy, fan-out and tolerance to timing jitter. In particular, they ...
An alexandrite pumped Nd:glass regenerative amplifier for chirped pulse amplification
(Elsevier, 1992-08-15)
An alexandrite pumped, Nd:glass regenerative amplifier is demonstrated. This amplifier has been used with chirped pulse amplification to produce millijoule, picosecond pulses. Using this technique the overall gain bandwidth ...
Inclusion of spin-orbit coupling into tight binding bandstructure calculations for bulk and superlattice semiconductors
(Elsevier, 1987-05)
Recent interest in superlattice based semiconductor devices has led to the need for the ability to make accurate superlattice bandstructure calculations. The tight binding model formalism has already been applied to this ...
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 ...
Multifunctional layer-by-layer carbon nanotube–polyelectrolyte thin films for strain and corrosion sensing
(IOP Publishing Ltd, 2007-04-01)
Since the discovery of carbon nanotubes, researchers have been fascinated by their mechanical and electrical properties, as well as their versatility for a wide array of applications. In this study, a carbon nanotube–pol ...