Now showing items 21-30 of 169
Inversion of spherical means using geometric inversion and Radon transforms
(IOP Publishing Ltd, 1992-12-01)
The author considers the problem of reconstructing a continuous function on Rn from certain values of its spherical means. A novel aspect of the approach is the use of geometric inversion to recast the inverse spherical ...
A CMOS-compatible high aspect ratio silicon-on-glass in-plane micro-accelerometer
(IOP Publishing Ltd, 2005-02-01)
This paper presents a post-CMOS-compatible micro-machined silicon-on-glass (SOG) in-plane capacitive accelerometer. The accelerometer is a high aspect ratio structure with a 120 µm thick single-crystal silicon proof-mass ...
LETTER TO THE EDITOR: Sharp variations in the temperature dependence of optical reflectivity from AlN/GaN heterostructures
(IOP Publishing Ltd, 2003-02-01)
Sharp variations in optical reflectivity were observed when cooling and heating AlN/GaN heterostructures on sapphire substrates between room temperature and 10 K. The reflectivity was found to decrease at a definite ...
Three dimensional adaptive mesh refinement on a spherical shell for atmospheric models with lagrangian coordinates
(IOP Publishing Ltd, 2007-07-01)
One of the most important advances needed in global climate models is the development of atmospheric General Circulation Models (GCMs) that can reliably treat convection. Such GCMs require high resolution in local convectively ...
A micromachined 2D positioner with electrothermal actuation and sub-nanometer capacitive sensing
(IOP Publishing Ltd, 2003-03-01)
This paper reports on a multi-purpose two-axis micropositioner with sub-nanometer position sensing for precise feedback control. Along each axis it has an electrothermal actuator, a capacitive position sensor and a ...
Additive pulse mode-locking using a birefringent optical fiber
(Elsevier, 1994-01-15)
A powerful and increasingly common method to mode-lock a variety of lasers is additive pulse mode-locking (APM). In this technique, a nonlinear medium is placed in an external cavity which is coupled to the main laser ...
Intersubband absorption in annealed InAs/GaAs quantum dots: a case for polarization-sensitive infrared detection
(IOP Publishing Ltd, 2003-08-07)
We have studied the characteristics of intersubband absorption of polarized infrared (IR) radiation in as-grown and annealed self-organized InAs/GaAs quantum dots. It is observed that with the increase of annealing time ...
Embedding damage detection algorithms in a wireless sensing unit for operational power efficiency
(IOP Publishing Ltd, 2004-08-01)
A low-cost wireless sensing unit is designed and fabricated for deployment as the building block of wireless structural health monitoring systems. Finite operational lives of portable power supplies, such as batteries, ...
Enhanced and quenched Raman scattering by interface phonons in semiconductor superlattices: What are the defects?
(Elsevier, 1988)
We report on the magnetic field and power density dependences of resonant Raman scattering by interface phonons in GaAs---AlxGa1-xAs superlattices. Strong photoexcitation leads to quenching of the nominally forbidden (and ...
Single optical cycle laser pulse in the visible and near-infrared spectral range
(Springer-Verlag, 1999-09)
Since the inception of the laser, pulse duration has been continuously decreased by the use of a variety of techniques: Q-switching, mode-locking, and pulse compression. We would like to present a new technique based on ...