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Displaying 39176 - 39200 of 73929

Dipole Moment of a Pb-O Vacancy Pair in PbTiO 3

April 1, 2004
Author(s)
Eric J. Cockayne, Benjamin P. Burton
The polarization of a nearest-neighbor (nn) Pb-O vacancy pair in PbTiO3 is calculated, using the modern theory of polarization, implemented in the density functional theory ultrasoft pseudopotential formalism. The dipole moment per divacancy is about 2.228

Dynamic Mechanical Analysis of Pure Mg and Mg AZ31 Alloy

April 1, 2004
Author(s)
A -. Munitz, D -. Dayan, David J. Pitchure, Richard E. Ricker
Dynamic mechanical analyses were performed on pure Mg and Mg AZ31 alloy to study the impact of thermo-mechanical state and grain structure on the complex modulus (E*=E'+iE). The storage modulus (E') of pure Mg was found to be (40.0+2.5) GPa and indpendent

Enterprise Simulation: A Hybrid System Approach

April 1, 2004
Author(s)
Luis C. Rabelo, M Helal, Hyeung-Sik Min, Albert T. Jones
Manufacturing enterprise decisions can be classified into four groups: business decisions, design decisions, engineering decisions, and production decisions. Numerous physical and software simulation techniques have been used to evaluate specific decisions

Fire Safety of Passenger Trains. Phase 3. Evaluation of Fire Hazard Analysis Using Full-Scale Passenger Rail Car Tests (NISTIR 6563)

April 1, 2004
Author(s)
Richard D. Peacock, Jason D. Averill, Daniel M. Madrzykowski, D W. Stroup, Paul A. Reneke, Richard W. Bukowski
Fire safety is an area of particular interest for both conventional intercity and commuter passenger trains, and new high-speed trains. A systems approach to fire safety addresses passenger rail car design and materials, detection and suppression

Forensic Software Testing Support Tools: Test Summary Report

April 1, 2004
Author(s)
Elizabeth N. Fong, Serban I. Gavrila
The Computer Forensic Tool Testing (CFTT) project at the National Institute of Standards and Technology (NIST), an agency of the United States Department of Commerce, provides a measure of confidence in the software tools used in computer forensic

Generation and Transport of Smoke Components

April 1, 2004
Author(s)
Kathryn M. Butler, George W. Mulholland
Smoke is a mixture of gases and suspended particulate matter, or aerosols. The nature of the aerosol component of smoke can play a significant role in the lethal and sublethal effects on people. This paper presents the current state of knowledge about

Generation and Transport of Smoke Components.

April 1, 2004
Author(s)
Kathryn M. Butler, George W. Mulholland
Smoke is a mixture of gases and suspended particulate matter, or aerosols. The nature of the aerosol component of smoke can play a significant role in the lethal and sublethal effects on people. This paper presents the current state of knowledge about

Improved Thermal Stability of Organically Modified Layered Silicates

April 1, 2004
Author(s)
Rick D. Davis, Jeffrey W. Gilman, T E. Sutto, J H. Callahan, Paul C. Trulove, Hugh C. De Long
Bromide containing impurities were found to decrease the thermal stability of quaternary alkyl ammonium modified layered silicates. Improved purification procedures completely removed these bromide anions and led to a 20 C to > 100 C increase in organic

Improving Software Quality Through Better Design and Testing

April 1, 2004
Author(s)
John Barkley, Mark Skall
Our results extending Kuhn's fault class hierarchy provide a justification for the focus of fault-based testing strategies on detecting particular faults and ignoring others. We develop a novel analytical technique that allows us to elegantly prove that

Improving the Usability and Accessibility of Voting Systems and Products

April 1, 2004
Author(s)
Sharon J. Laskowski, James H. Yen, M Autry, John V. Cugini, W Killam
In the Help America Vote Act (HAVA) of 2002, Public Law 107-252, the Election Assistance Commission, in consultation with the National Institute of Standards and Technology, is mandated to submit a report on human factors, usability, and accessibility to

Inconsistencies Between Lifetime and Polarizability Measurements in Cs

April 1, 2004
Author(s)
M S. Safronova, Charles W. Clark
Electric-dipole matrix elements for 6p-nd, n=5, 6, 7 transitions in cesium are calculated using a relativistic all-order method. The resulting matrix elements are used to evaluate 5d lifetimes and 6p polarizabilities. The data are compared with

Influence of Heating Rate on Flow Stress in High-Speed Machining Processes

April 1, 2004
Author(s)
Timothy J. Burns, Robert W. Ivester, Michael Kennedy, Richard L. Rhorer, Matthew A. Davies, Howard Yoon, Lyle E. Levine, Richard J. Fields, D Basak, Eric P. Whitenton
For several decades, a major focus of machining research has been the measurement and prediction of temperature. Here, the influence of the rate of heating on the flow stress, and the implications of this for finite-element modeling of high speed metal

Interstellar Antifreeze: Ethylene glycol

April 1, 2004
Author(s)
J M. Hollis, Francis J. Lovas, P R. Jewell, L H. Coudert
Interstellar ethylene glycol (HOCH2CH2OH) has been detected in emission toward the Galactic center source Sagittarius B2( N-LMH) by means of several millimeter-wave rotational torsional transitions of its lowest energy conformer. The types and kinds of

Intrinsic Standards for UV/Visible Spectrophotometry

April 1, 2004
Author(s)
John C. Travis, David L. Duewer, Marc L. Salit
The 21st century global marketplace and international performance standards provide a steady demand for fit-for-purpose reference materials. An efficient system for the delivery of reference materials to end-users begins with responsive and competitive
Displaying 39176 - 39200 of 73929
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