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Displaying 41526 - 41550 of 74090

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

The NIST Human ID Evaluation Framework

April 1, 2003
Author(s)
Ross J. Micheals, Patrick J. Grother, P J. Phillips
In this paper, we investigate the utility of static anthropometric distances as a biometric for human identification. The 3D landmark data from the CAESAR database is used to form a simple biometric consisting of distances between fixed rigidly connected

The NIST Microforce Realization and Measurement Project

April 1, 2003
Author(s)
David B. Newell, Edwin R. Williams, John A. Kramar, Jon R. Pratt, Douglas T. Smith
The National Institute of Standards and Technology (NIST) has launched a five-year Micro-force Realization and Measurement project focusing on the development of an instrument and laboratory capable of realizing and measuring the SI unit of force below

The TREC-2002 Filtering Track Report

April 1, 2003
Author(s)
S E. Robertson, Ian Soboroff
The TREC¿11 filtering track measures the ability of systems to build persistent user profiles which successfully separate relevant and non-relevant documents in an incoming stream. It consists of three major subtasks; adaptive filtering, batch filtering

The TREC-2002 Video Track Report

April 1, 2003
Author(s)
Alan Smeaton, Paul D. Over
TREC-2002 saw the second running of the Video Track, the goal of which was to promote progress in content-based retrieval from digital video via open, metrics-based evaluation. The track used 73.3 hours of publicly available digital video (in MPEG-1/VCD

Toward a Real-time Scheduler and Controller for Semiconductor Fabrication Systems

April 1, 2003
Author(s)
Hyeung-Sik Min, Albert T. Jones, Yuehwern Yih
The complexity of a semiconductor fabrication system is high because of complicated product flows, uncertain operation times, variable yields, changing products, and evolving technologies. Effective scheduling, which attempts (1) to predict accurately the

Traction-Free Vibrations of Finite Trigonal Elastic Cylinders

April 1, 2003
Author(s)
Paul R. Heyliger, Ward L. Johnson
The unrestrained, traction-free vibrations of finite elastic cylinders with trigonal material symmetry are studied using two approaches, based on the Ritz method, which formulate the weak form of the equations of motion in cylindrical and retangular

Ultrasonic Evaluation Methods Applicable to Polymer Concrete Composites

April 1, 2003
Author(s)
A Garbacz, Edward Garboczi
Polymer composites (PC) appear as useful materials for repair and protection of building structures, as well as for manufacturing pre-cast elements. In the case of pre-cast elements as well as repair materials, the usefulness and durability of polymer

Wind Speeds in ASCE 7 Standard Peak-Gust Map: Assessment

April 1, 2003
Author(s)
Emil Simiu, R Wilcox, Fahim Sadek, James J. Filliben
The ASCE 7 peak-gust map division of the conterminous United States into two adjacent wind speed zones does not reflect correctly the country's differentiated extreme wind climate. The methodology used to develop the map averages out real climatological

Wind Speeds in the ASCE 7 Standard Peak-Gust Map: An Assessment

April 1, 2003
Author(s)
Emil Simiu, R Wilcox, Fahim Sadek, James J. Filliben
The ASCE 7 peak-gust map division of the conterminous United States into two adjacent wind speed zones does not reflect correctly the country's differentiated extreme wind climate. The methodology used to develop the map averages out real climatological
Displaying 41526 - 41550 of 74090
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