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Displaying 47501 - 47525 of 73969

Design of a Flexible, Integrated Testing System for STEP and OMG Standards

September 1, 2000
Author(s)
KC Morris, David Flater
New software standards supporting integration of manufacturing and engineering systems are emerging at a rapid pace. These standards are based on common method s, which can be exploited in developing tests for systems supporting the standards. This paper

Determining the Determinant

September 1, 2000
Author(s)
Isabel M. Beichl, F Sullivan
In this Installment, we describe the bareiss method for finding the determinant of an integer matrix where all the arithmetic is done in integer mode. Of course, it will also work for any kind of matrix even if not using integers, but there are better ways

Doppler-Free Two-Photon Spectroscopy in the VUV: The Helium 1 1 S - 2 1 S Transition

September 1, 2000
Author(s)
S D. Bergeson, K G. Baldwin, Thomas B. Lucatorto, T J. McIlrath, C H. Cheng, E E. Eyler
We describe techniques for laser spectroscopy in the vacuum ultraviolet (VUV) spectral region that combine high spectral resolution with high absolute accuracy. A nearly transform-limited nanosecond laser source at 120 nm is constructed using difference

Elastic Stiffnesses of an Nb-Ti/Cu-Composite Superconductive Wire

September 1, 2000
Author(s)
Sudook A. Kim, H M. Ledbetter, H Ogi
Elastic-stiffness coefficients were determined on a 1.4-mm-diameter wire consisting of superconducting Nb-Ti fibers in a copper matrix, with a polyvinyl-resin coating. The matrix contained 324 Nb-Ti fibers. An electromagnetic-acoustic-resonance method was

Electrical Conductivity of Xenon at Megabar Pressures

September 1, 2000
Author(s)
M. I. Eremets, E. A. Gregory, V. V. Struzhkin, H. K. Mao, R. J. Hemley, N. Mulders, Neil M. Zimmerman
The electrical transport properties of solid xenon were directly measured at pressures up to 155 GPa and temperatures from 300 K to 27 mK. The temperature dependence of resistance changed from semiconducting to metallic at pressures between 121 and 138 GPa

Electron Interactions with SF 6

September 1, 2000
Author(s)
Loucas G. Christophorou, James K. Olthoff
We have comprehensively reviewed and critically assessed the state of knowledge on electron-interaction cross sections and electron-swarm parameters in SF 6. In this paper are presented our: (1) assessed data for the total electron scattering, elastic

Electron-Impact Ionization Cross Section Database (Version 2.0)

September 1, 2000
Author(s)
Yong-Ki Kim, Karl Irikura, M E. Rudd, D Zucker, M A. Zucker, J S. Coursey, Karen J. Olsen, G G. Wiersma
This is a database primarily of total ionization cross sections of molecules by electron impact. The database also includes cross sections for a small number of atoms and energy distributions of ejected electrons for H, He, and H 2. The cross sections were

Environmental Issues in Collaborative Design

September 1, 2000
Author(s)
Robert Allen, Ram D. Sriram
We report about environmental issues in collaborative design. Specifically, we present background and motivation for the need to design greener products. After defining the green design process, we demonstrate how that integrates with the typical product

Fast Quantum Gates for Neutral Atoms

September 1, 2000
Author(s)
D Jaksch, J I. Cirac, W.H. Zoller, S L. Rolston, R Cote, M D. Lukin
We propose several schemes for implementing a fast two-qubit quantum gate for neutral atoms with the gate operation time much faster than the time scales associated with the external motion of the atoms in the trapping potential. In our example, the large

Form Error and Hardness Performance of Rockwell Diamond Indenters

September 1, 2000
Author(s)
Jun-Feng Song, Samuel R. Low III, Li Ma
The influences of form errors on hardness performance of Rockwell diamond indenter are discussed. Experimental results are introduced. The Finite Element Analysis (FEA) method is used to simulate the hardness measurement process. The effect of tip radii

Gravitational Constant

September 1, 2000
Author(s)
J. Schwarz
An article discussing current research in the determination of the gravitational constant. Discuss how the Newtonian gravitation constant (G) is known with relatively poor accuracy (only about 0.1%). Moreover, some recent measurements have disagreed more

Ground Wave of an Idealized Lightning Return Stroke

September 1, 2000
Author(s)
J. R. Wait, David A. Hill
We model a lightning return stroke by a vertical traveling wave of current with a complex propagation constant. The Sommerfeld-integral analysis is similar to that of a vertical electric dipole over a lossy earth except that the source is distributed in

Imaging the Phase of an Evolving Bose-Einstein Condensate Wave Function

September 1, 2000
Author(s)
J E. Simsarian, J Denschlag, M Edwards, Charles W. Clark, Lu Deng, Edward W. Hagley, Kristian Helmerson, S L. Rolston, William D. Phillips
We demonstrate a spatially resolved autocorrelation measurement with a Bose-Einstein condensate (BEC) and measure the evolution of the spatial profile of its quantum mechanical phase. After releasing the BEC from the magnetic trap, the phase develops a

Improved Near-Infrared Spectral Responsivity Scale

September 1, 2000
Author(s)
Ping-Shine Shaw, Thomas C. Larason, R Gupta, Steven W. Brown, Keith R. Lykke
A cryogenic radiometer-based system was constructed at the National Institute of Standards and Technology (NIST) for absolute radiometric measurements to improve detector spectral responsivity scales in the wavelength range from 900 nm to 1800 nm. In

Initial Etching of GaAs (001) During H 2 Plasma Cleaning

September 1, 2000
Author(s)
Steven W. Robey, K Sinniah
The initial etching of GaAs(001) during remote H 2 plasma etching for oxide removal was examined using Atomic Force Microscopy (AFM), coupled with in situ Reflection High Energy Diffraction (RHEED) and Auger spectroscopy. Localized etching of the GaAs
Displaying 47501 - 47525 of 73969
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