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Displaying 16276 - 16300 of 17291

Object-Oriented Representation of Electro-Mechanical Assemblies Using UML

January 1, 2004
Author(s)
Sudarsan Rachuri, Y H. Han, Shaw C. Feng, Utpal Roy, Fujun Wang, Ram D. Sriram, Kevin W. Lyons
The important issue of mechanical assemblies has been a subject of intense research over the past several years. Most electromechanical products are assemblies of several components, for various technical as well as economic reasons. This report provides

The Role Control Center: Features and Case Studies

June 4, 2003
Author(s)
David F. Ferraiolo, Gail-Joon Ahn, Ramaswamy Chandramouli, Serban I. Gavrila
Role-based Access Control (RBAC) models have been implemented not only in self-contained resource management products such as DBMSs and Operating Systems but also in a class of products called Enterprise Security Management Systems (ESMS). ESMS products

Recent Results of NIST Realizations of the ITS-90 Below 84 K

January 1, 2003
Author(s)
Weston L. Tew, Christopher W. Meyer
The results at NIST of realizations and comparisons of the ITS-90 below 84 K are presented. The 3He and 4He vapor pressure scales (0.65 K to 5.0 K), and the interpolating constant volume gas thermometer (ICVGT) scale (5.0 K to 24.556 K) as realized from

Analysis of [nu] 2 , [nu] 4 Infrared Hot Bands of 32 S 16 O 3 : Resolution of the Puzzle of the V 1 CARS Spectrum

November 1, 2002
Author(s)
J Barber, E T. Chrysostom, Tony Masiello, J Nibler, A G. Maki, A Weber, Thomas A. Blake, R L. Sams
Further analysis of the high-resolution (0.0015 CM -1) infrared spectrum of 32S 160 3 has led to the assignment of more than 3100 hot band transitions from Ņ2 and Ņ4 levels to the states 2Ņ 2 (1=0), {nu] 2 + Ņ 4 (l= 1), and 2Ņ 4 (l=0, 2). These levels are

Damage Testing of Partial Reflectors for 157 nm Laser Calorimeters

January 1, 2002
Author(s)
Holger Laabs, Richard D. Jones, Christopher L. Cromer, Marla L. Dowell, V. Liberman
We determined the damage thresholds and lifetimes of several materials using 157 and 193 nm excimer lasers and a beam profile technique similar to that described in ISO 11254-2. We made these measurements to select an appropriate absorbing material for use

Alpha Case Thickness Modeling in Investment Castings

December 1, 2000
Author(s)
William J. Boettinger, Maureen E. Williams, Sam R. Coriell, Ursula R. Kattner, B A. Mueller
The alpha case thickness at the surface of a Ti-6Al-4V step wedge investment casting has been measured and successfully predicted. The prediction uses temperature-time results obtained from a heat flow simulation of the casting that was performed with a

SMAT: Synchronous Multimedia and Annotation Tool

September 1, 2000
Author(s)
Michelle P. Steves, Mudumbai Ranganathan, Emile L. Morse
… research project at the National Institute of Standards and Technology (NIST). The primary functional …

Stabilizing and Measuring Optical Frequencies

October 1, 1999
Author(s)
John L. Hall, M S. Taubman, Scott A. Diddams, B Tiemann, Jun Ye, L -. Ma, D J. Jones, Steven T. Cundiff
… an exciting time in the development of optical frequency standards. These include improved strategies for …

NIST Atomic and Molecular Databases on the World Wide Web

August 1, 1998
Author(s)
Robert A. Dragoset, Peter J. Mohr, Karen J. Olsen, Edward B. Saloman, G G. Wiersma, D Zucker
… The Physics Laboratory of the National Institute of Standards and Technology is using the world wide web to …

Critical Compilation of Atomic Wavelength and Energy Level Data

April 1, 1998
Author(s)
William C. Martin, J Sugar, Arlene Musgrove, Craig J. Sansonetti, Jean E. Sansonetti, Edward B. Saloman, V I. Azarov, Alexander Kramida, A N. Ryabtsev, T Shirai
… Energy Levels Data Center at the National Institute of Standards and Technology (NIST), in cooperation with other …
Displaying 16276 - 16300 of 17291
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