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Displaying 34951 - 34975 of 74024

Terahertz circular variable filters

February 15, 2006
Author(s)
Erich N. Grossman, Charles Dietlein, A. Luukanen
We describe a novel class of millimeter-wave and terahertz monochrometers based on adiabatically tuned frequency-selective surfaces. They are analogous to the circular-variable filters commonly used in the infrared for low to moderate resolution

The Distillation and Volatility of Ionic Liquids

February 15, 2006
Author(s)
Martyn J. Earle, Jose M. Esperanca, Manuela A. Gilea, Luis P. Rebelo, Kenneth R. Seddon, Joe W. Magee, Jason A. Widegren
The distillation of a variety of ionic liquids is demonstrated for the first time. The distillations are performed at moderate to high temperatures and at reduced pressure.

High-resolution spectral hole burning in InGaAs/GaAs quantum dots

February 10, 2006
Author(s)
Joseph J. Berry, Martin Stevens, Richard Mirin, Kevin L. Silverman
We report the use of continuous wave spectral hole burning to perform high-resolution spectroscopy of the homogeneous linewidth of self-assembled InGaAs/GaAs quantum dots at low temperature. We use this technique to examine the power broadening behavior of

Optical Metrology for LEDs and Solid State Lighting

February 9, 2006
Author(s)
Yoshi Ohno
The performance of Light Emitting Diodes (LEDs), including efficiency, flux level, lifetime, and the variation of color, is advancing at a remarkable pace. LEDs are increasingly used for many applications including automotive, aviation, display

Development of a Color Quality Scale

February 8, 2006
Author(s)
Wendy L. Davis, Yoshihiro Ohno
A new metric for evaluating the color quality of light sources is being developed at NIST, in close contact with the lighting industry and the CIE. The current CIE Color Rendering Index (CRI) is outdated and has several known deficiencies. The CRI only

Energy Levels and Spectral Lines of Ne VII

February 8, 2006
Author(s)
Alexander Kramida, M-C Buchet-Poulizac
All experimental data on Ne VII, including previously unpublished beam-foil spectroscopy data, have been compiled and critically evaluated. More than a hundred spectral lines have been newly identified. For 40 transitions, the previous identifications have

Investigation of Source Detection Algorithms for Gross Counting Portal Monitors

February 8, 2006
Author(s)
C G. Wahl, D J. Alderson, Leticia S. Pibida
In recent years, heightened security concerns have prompted increased interest in radiation portal monitors, instruments capable of detecting, and in some cases identifying, gamma-ray and neutron-emitting radioactive material passing through them. Along

An Implementation of the Proposed IEEE 1451.0 and 1451.5 Standards

February 7, 2006
Author(s)
Eugene Song, Kang B. Lee
This Paper describes an implementation of the proposed IEEE 1451.0 and 1451.5 Standards. The implemented systsem was developed based on the object-oriented framework of the IEEE 1451 standards using UML tools and Java programming language. The system

High-Contrast CPT Resonances

February 7, 2006
Author(s)
John E. Kitching
The performance of an atomic clock or magnetometer based on CPT is determined by the resonance width and the signal-to-noise ratio. In particular, a large signal amplitude results in a high stability for a clock or a high sensitivity for a magnetometer

Local Structures and Raman Spectra in the Ca(Zr,Ti)O 3 Perovskite Solid Solutions

February 7, 2006
Author(s)
Igor Levin, Eric J. Cockayne, M W. Lufaso, Joseph C. Woicik, James E. Maslar
Local structures and cation distributions in perovskite Ca(Zr, Ti)O3 solid solutions were analyzed using X-ray absorption fine structure and pair-distribution functions obtained from total neutron scattering. The analyses revealed that the Zr-O and Ti-O

Dynamic Simulation and Modeling of a Road Vehicle

February 2, 2006
Author(s)
Tsung-Ming Tsai
Automated driving of road vehicles needs to use a simulation environment to develop control programs. A vehicle dynamic simulation program was implemented into a computer system. It contains a vehicle dynamic model that models all essential parts of a

Biometrics Standards ? Rising to the Challenge of Technology Innovation

February 1, 2006
Author(s)
Fernando L. Podio
For decades, biometric technologies were primarily used in law enforcement applications. Currently, they are increasingly being required in multiple public and private sector applications worldwide to authenticate a person?s identity, secure national

CCQM-K13.1 Subsequent Key Comparison: Cadmium and Lead in Sediment

February 1, 2006
Author(s)
Robert R. Greenberg
CCQM-K13.1 is a Subsequent Key Comparison for Cadmium and Lead in Sediment conducted to provide the opportunity for two NMIs to demonstrate and document improvements in measurement capability achieved since the conduct of CCQM-K13, Amount content of

CCQM-K31 Key Comparison: Arsenic in Shellfish

February 1, 2006
Author(s)
Robert R. Greenberg, Elizabeth A. Mackey
A Key Comparison (CCQM-K31) of the determination of arsenic in a marine shellfish (oyster tissue) was conducted under the auspices of the CCQM Inorganic Analysis Working Group as a follow-up to the CCQM-P11 Pilot Study. Arsenic was present at naturally

Comment on the Paper Metrologia 42 49-57 (2005) by K. Szymaniec et al,

February 1, 2006
Author(s)
Steven R. Jefferts, F Levi
A recent evaluation of the accuracy of National Physical Laboratory (NPL) primary frequency standard NPL CsF1 gives an overall frequency uncertainty of δŅ/Ņ 0 = 1 × 10 -15. This stated uncertainty includes a correction of a frequency bias of δŅ/Ņ 0 = 8 ×
Displaying 34951 - 34975 of 74024
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