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Displaying 41626 - 41650 of 74203

Optimizing the Fast Rydberg Quantum Gate

April 1, 2003
Author(s)
M S. Safronova, Carl J. Williams, Charles W. Clark
The fast phase gate scheme, in which the qubits are atoms confined in sites of an optical lattice, and gate operations are mediated by excitation of Rydberg states, was proposed by Jaksch et al. Phys. Rev. Lett. 85, 2208 (2000). A potential source of

Overview of the TREC 2002 Novelty Track

April 1, 2003
Author(s)
Donna K. Harman
The novelty track was a new track in TREC-11. The basic task was as follows: given a TREC topic and an ordered list of relevant documents (ordered by relevance ranking), find the relevant and novel sentences that should be returned to the user from this

Overview of the TREC 2002 Question Answering Track

April 1, 2003
Author(s)
Ellen M. Voorhees
The TREC question answering track is an effort to bring the benefits of large-scale evaluation to bear on the question answering problem. The track contained two tasks in TREC 2002, the main task and the list task. Both tasks required that the answer

Policy Expression and Enforcement for Handheld Devices

April 1, 2003
Author(s)
Wayne Jansen, Tom T. Karygiannis, Vladimir Korolev, Serban I. Gavrila, Michaela Iorga
The use of mobile handheld devices, such as Personal Digital Assistants (PDAs) and tablet computers, within the workplace is expanding rapidly. These devices are no longer viewed as coveted gadgets for early technology adopters, but instead have become

Raman Scattering in C 60 and C 48 N 12 Aza-Fullerene: First-Principles Study

April 1, 2003
Author(s)
R H. Xie, Garnett W. Bryant, V H. Smith
We carry out large-scale ab initio calculations of Raman scattering activity and Raman-active frequencies (RAF s) in C 48 N 12 aza-fullerene. Th results are compared with those of C 60. Twenty-nine non-degenerate polarized and 29 doubly degenerate

Reference Material 8457, Ultra High Molecular Weight Polyethylene 0.5 cm Cubes

April 1, 2003
Author(s)
B M. Fanconi, John A. Tesk, William F. Guthrie
The geometric and surface features of a new NIST reference material, RM 8457 are presented. This reference material is composed of Ultra High Molecular Weight Polyethylene (UHMWPE) in the form of 5 mm cubes. These cubesare intended for use in swelling

Report to Council From Reference Materials, Reference Data Subcommittee

April 1, 2003
Author(s)
John A. Tesk, K White
Subcommittee & member actions: H Membership is adjusted for 2003-2004. H Society approval sought for co-sponsorship of a NIST symposium on Cell Signaling. H RM 8457, cubes of Ultrahigh Molecular Weight Polyethylene, will be available after some

Singular Grain Boundaries in Alumina and Their Roughening Transition

April 1, 2003
Author(s)
C W. Park, D C. Yoon, J Blendell, C A. Handwerker
The shapes and structures of grain boundaries formed between the basal (0001) surface of large alumina grains and randomly oriented small alumina grains are shown to depend on the additions of SiO 2, CaO, and MgO. If a sapphire crystal is sintered at 1620

Smoke Component Yields From Room-Scale Fire Tests (NIST TN 1453)

April 1, 2003
Author(s)
Richard G. Gann, Jason D. Averill, Erik L. Johnsson, Marc R. Nyden, Richard D. Peacock
This report presents the methodology for and results from a series of room-scale fire tests to produce data on the yields of toxic products in both pre-flashover and post-flashover fires. The combustibles examined were: a sofa made of upholstered cushions

Statistical Uncertainty Analysis of Key Comparison CCEM-K2

April 1, 2003
Author(s)
Nien F. Zhang, N Sedransk, Dean G. Jarrett
The details of a statistical uncertainty analysis applied to key comparison CCEM-K2 are reported. The analysis presented here provides an approach for addressing known correlations which have been of concern in reporting key comparison results

Structure of Sapphire Bicrystal Boundaries Produced by Liquid-Phase Sintering

April 1, 2003
Author(s)
B Hockey, Sheldon M. Wiederhorn, J Blendell, Jong S. Lee, M K. Kang
Vitreous bonded aluminum oxide bicrystals were formed by growing oriented sapphire through polycrystalline tapes of anorthite-bonded aluminum oxide. The structure and composition of the bicrystal grain boundaries depended on the crystallographic

The Advanced Encryption Standard (AES): Raising the Bar for Cryptography

April 1, 2003
Author(s)
William E. Burr
This paper describes how the National Institute of Standards and Technology (NIST) selected the Advanced Encryption Standard (AES), a new standard symmetric key encryption algorithm that has been adopted for use by the U.S. Federal Government, for

The Bromine Doping of Polyacetylene

April 1, 2003
Author(s)
C. K. Chiang
The first doping experiment of polyacetylene performed by Chiang and Shirakawa in 1976 is described. The first successful doping experiment of polyacetylene impacted physics and chemistry in three aspects: 1) discovery of metallic conducting synthetic

The Development and Application of Cryocoolers Since 1985

April 1, 2003
Author(s)
Ray Radebaugh
Many significant new developments in cryocoolers have occurred since about 1985 that have lead to grealy improved efficiencies, lifetimes, compactness, and low temperature limits. Many of the improvements have been spurred by the requirements of several

The Eleventh Text Retrieval Conference (TREC 2002)

April 1, 2003
Author(s)
Ellen M. Voorhees
TREC 2002 is the latest in a series of workshops designed to foster research in information retrieval and related tasks. This year's conference consisted of seven different tasks: cross-language retrieval, filtering, interactive retrieval, novelty
Displaying 41626 - 41650 of 74203
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