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Displaying 36501 - 36525 of 73697

Parameter Affecting the Performance of a Residential-Scale Stationary Fuel Cell System

May 23, 2005
Author(s)
Mark W. Davis, Arthur H. Fanney, Michael J. LaBarre, K R. Henderson, Brian P. Dougherty
Researchers at the National Institute of Standards and Technology (NIST) have measured the performance of a residential fuel cell system when subjected to various environmental and load conditions. The system, which uses natural gas as its source fuel, is

A variable repetition rate frequency comb for infrared frequency metrology

May 22, 2005
Author(s)
Brian Washburn, R W. Fox, William C. Swann, Nathan R. Newbury, Jeffrey W. Nicholson, K Feder, Paul S. Westbrook
A frequency comb generated by a variable repetition rate mode-locked fiber laser is presented. The spacing of the frequency comb can be scanned while one comb tooth is phase-locked to a stable RF source.

Efficiently Generation of Correlated Photon Pairs in Microstructure Fibers

May 22, 2005
Author(s)
Jingyun Fan, Alan L. Migdall, L Wang
We report the efficient generation of correlated photon pairs by four-wave mixing in a 1.8 meter long microstructure fiber. The detected coincidence rate is 10,000/s with 0.8 nm collection bandwidth, the highest to date in a fiber-based photon source. The

Frequency Comb Dynamics of a Solitonic Fiber Laser: Theory

May 22, 2005
Author(s)
Nathan R. Newbury, Brian Washburn
The effects of Raman, self-steepening and higher-order dispersion on a fiber-laser frequency comb are analyzed using perturbation theory. Transfer functions are derived for the comb response to change in cavity length or pump power.

Optical Atomic Clocks: A Revolution in Perfomance

May 22, 2005
Author(s)
Leo W. Hollberg
Optical atomic clocks using cold atoms, stable lasers and femtosecond laser frequency combs provide high accurace and stability from RF to the ultraviolet. They have unprecedented performance: ultrahigh stability, sub-fs timing jitter, lowe-noise

The Performance of Chip-Scale Atomic Clocks

May 22, 2005
Author(s)
Svenja A. Knappe, P Schwindt, Leo W. Hollberg, John E. Kitching, V Shah, Vladislav Gerginov
We compare the performance of two chip-scale atomic clock physics packages, one based on excitation using the D 2 line if Cs and the other using the D 1 line of 87Rb.

Ultra-high Stability Optical Frequency Standard Based on Laser-Cooled Neutral Calcium

May 22, 2005
Author(s)
G Wilpers, Christopher W. Oates, Scott A. Diddams, A Bartels, Windell Oskay, James C. Bergquist, Leo W. Hollberg
A beatnote between the Ca and Hg+ optical frequency standards via a mode-locked fs-laser frequency comb demonstrates the highest frequency stability measured to date. The high stability accelerates evaluation of the Ca standard's systematic shifts.

Laser Cooling of Erbium Atoms

May 21, 2005
Author(s)
Jabez J. McClelland, H Y. Ban, Marcus Jacka, James L. Hanssen, Joseph Reader
We have identified five closed, or nearly-closed, J ? J + 1 transitions in atomic erbium at wavelengths of 401 nm, 583 nm, 631 nm, 841 nm, and 1299 nm. These transitions can be reached by common tunable single-frequency laser systems, and are thus in

Direct Measurement of the Counterion Distribution Within Swollen Polyelectrolyte Films

May 20, 2005
Author(s)
Vivek M. Prabhu, B D. Vogt, Wen-Li Wu, Jack F. Douglas, Eric K. Lin, Sushil K. Satija, D M. Goldfarb, H Ito
A depth profile of the counterion concentration within thin polyelectrolyte films was measured in-situ using contrast variant specular neutron reflectivity to characterize the initial swelling stage of the film dissolution. We find a substantial counterion

HiCASS Target Tracking Sensor Study

May 20, 2005
Author(s)
Richard J. Norcross
The High Capacity Alongside Sea base Sustainment (HiCASS) program intends to generate substantial improvements in skin-to-skin at-sea replenishment. HiCASS requires real-time tracking and dynamic load position sensing.

Holographic microantenna array metrology

May 19, 2005
Author(s)
Erich N. Grossman, Arttu Luukanen, Aaron J. Miller
We describe a holographic or "phaseless" technique for measurement of complex antenna patterns that is particularly suited to planar antennas at very high frequencies -mm-wave thru long-wave infrared -where phase coherent detection is impractical. It has

Software Interoperability: Enabling New Technologies

May 19, 2005
Author(s)
John V. Messina, Matthew L. Aronoff, Eric D. Simmon
New and potentially disruptive technologies are constantly being introduced into the electronic interconnection industry as companies seek to improve their manufacturing chain and stay competitive. These new technologies do not exist in a vacuum and must

ThermoData Engine (TDE): Software Implementation of the Dynamic Data Evaluation Concept

May 18, 2005
Author(s)
Michael D. Frenkel, Robert D. Chirico, Vladimir Diky, Xinjian Yan, Qian Dong, Chris D. Muzny
The first full-scale software implementation of the dynamic data evaluation concept {ThermoData Engine (TDE)} is described for thermophysical and thermochemical property data. This concept requires the development of large electronic databases capable of

Low-frequency noise measurements on commercial magnetoresistive magnetic field sensors

May 17, 2005
Author(s)
Nathan Stutzke, Stephen E. Russek, David P. Pappas, Mark Tondra
Low frequency noise was measured in the frequency range from 0.1 Hz to 10 kHz on a variety of commercially available magnetic sensors. The types of sensors investigated include anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR), and tunnel
Displaying 36501 - 36525 of 73697
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