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NIST Authors in Bold

Displaying 39151 - 39175 of 73697

Segmentation for Robust Tracking in the Presence of Severe Occlusion

February 18, 2004
Author(s)
Camillo A. Gentile, M Sznaier, O Camps
Tracking an object in a sequence of images can fail due to partial occlusion or clutter. Robustness to occlusion can be increased by tracking the object as a set of parts such that not all of these are occluded at the same time. However, successful

Absolute frequency measurements with a stabilized near-infrared optical frequency comb from a Cr:forsterite laser

February 15, 2004
Author(s)
Kristan L. Corwin, I Thomann, A Bartels, Tasshi Dennis, W. Fox, William C. Swann, E. A. Curtis, C. W. Oates, G Wilpers, Sarah L. Gilbert, Leo W. Hollberg, Nathan R. Newbury, Scott A. Diddams, Jeffrey W. Nicholson, M. Yan
A frequency comb is generated with a chromium-doped forsterite femtosecond laser, spectrally broadened in dispersion-shifted highly nonlinear fiber, and stabilized. The resultant evenly spaced comb of frequencies ranges from 1.1 to beyond 1.8 υm. The

Nonequilibrium Quasiparticles and Periodicity in Single-Cooper-Pair Transistors

February 13, 2004
Author(s)
Joe Aumentado, Mark W. Keller, John M. Martinis, Michel H. Devoret
We have made single-Cooper-pair transistors in which we control the spatial profile of the superconducting gap energy by oxygen doping. The profile dramatically affects the switching current vs. gate voltage curve of the transistor, changing its period

Phenomenological Theory of Current-Induced Magnetization Precession

February 13, 2004
Author(s)
Mark D. Stiles, J Xiao, A Zangwill
We solve appropriate drift-diffusion and Landau-Lifshitz-Gilbert equations to demonstrate that unpolarized current flow from a non-magnet into a ferromagnet can produce a precession-type instability of the magnetization. The fundamental origin of the

High-Resolution Cavity Ring-Down Spectroscopy of H216O at 10687.36 cm-1

February 11, 2004
Author(s)
Joseph T. Hodges
We describe a frequency-stabilized cavity ring-down spectroscopy apparatus enabling high-resolution line shape measurements of water vapor. The measured line strength and broadening parameter for the H216O transition at 10687.36 cm-1 are compared to

Workflow Automation in a B2B Web-Portal Testbed

February 10, 2004
Author(s)
Marjane Mabrouk, Frederic J. de Vaulx, Tom Rhodes
The work described in this report, focused on specifying and managing different steps of a Business-to-Business (B2B) workflow by developing and integrating a Workflow Management System (WMS) within the NIST B2B Web-portal. This allows us to manage the

X-Ray Topography

February 4, 2004
Author(s)
David R. Black, Gabrielle G. Long
The study of the interrelationships between processing, structure and properties of materials is fundamental to the field of materials science and engineering. The need to understand the microstructure of materials has driven the development of a wide

Abraham's Force on a Highly Dispersive Medium

February 2, 2004
Author(s)
Paul D. Lett, L Wang
We consider the radiation force on highly dispersive media. In doing so we reconsider an experiment proposed to measure the Abraham force term in the stress-energy tensor at optical frequencies by measuring the displacement of a transparent dielectric

A New Optical Tweezers Technique Using a Holographic Crystal

February 1, 2004
Author(s)
E Edgu-Fry, Kristian Helmerson, Joseph E. Reiner, Rani B. Kishore
It has been shown previously that radiation pressure from a highly focused beam can be used to trap and manipulate objects in an aqueous media [1]. Over the past decade there have been several studies done by various groups to increase the ability of

Absolute Surface Coverage Measurement Using a Vibrational Overtone

February 1, 2004
Author(s)
A C. Pipino, J P. Hoefnagels, N Watanabe
Sub-monolayer absolute surface number densities are obtained by cavity ring-down spectroscopy (CRDS) for three haloethylenes with differing molecular symmetries on silica using the first C-H stretching overtones. Gas-phase CRDS measurements provide
Displaying 39151 - 39175 of 73697
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