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Displaying 47851 - 47875 of 73830

The NIST X-Ray Optics Calibration Interferometer (XCALIBIR)

June 1, 2000
Author(s)
Angela Davies, Christopher J. Evans, R Kestner, M Bremer
NIST's next generation interferometer (XCALIBIR) is a 300mm aperture, general-purpose interferometer designed to push the limits of optical testing. In this presentation we describe the design goals and performance results of the instrument to date.

Uncertainty in Primary Gas Flow Standards Due to Flow Work Phenomena

June 1, 2000
Author(s)
John D. Wright, Aaron N. Johnson
Static gravimetric and static volumetric gas flow standards are both affected by uncertainty components related to the measurement of the change of mass of gas within the inventory volume. In the process of diverting gas into the collection vessel, rapid

Valence-Shell Autoionization of NO

June 1, 2000
Author(s)
S H. Southworth, T A. Ferrett, Jonathan E. Hardis, Albert C. Parr, J L. Dehmer
Autoionization of valence and Rydberg states in NO over the 12.5-18 eV photon energy range was studied by vibrationally resolved photoelectron spectroscopy of the 2π orbital. Complex, oscillatory structure is observed in NO + (2Π -1) X 1ς + partial cross

Video Based Metrology

June 1, 2000
Author(s)
Theodore D. Doiron, John R. Stoup, Tsai Hong Hong, Marilyn N. Abrams
With the rapid growth of video-based measurement and inspection systems, we would like to determine the extent to which industry needs calibration artifacts and standardized methods for video metrology. We hope to open a dialog among users for discussing

Workshop on Evaluating Collaborative Enterprises - Workshop Report

June 1, 2000
Author(s)
Robert Allen, Amy Knutilla, Michelle P. Steves
The workshop, Evaluating Collaborative Engerprises, explored the issues surrounding the evaluation of collaborative systems including methods and tools for evaluating collaborative software as well as application-specific evaluation experiences. This paper

Photon-Assisted Tunneling in Electron Pumps

May 29, 2000
Author(s)
M. Covington, Mark W. Keller, Richard L. Kautz, John M. Martinis
We measure photon-assisted tunneling in 4- and 6-junction electron pumps at photon frequencies up to 60 GHz. We determine the microwave voltage at the pumps using noise thermometry. The standard theory of leakage in the electron pump, modified to include

Compound semiconductor oxide antireflection coatings

May 15, 2000
Author(s)
K. J. Knopp, Richard Mirin, Kristine A. Bertness, Kevin L. Silverman, David H. Christensen
We report the development of high quality, broad-bandwidth, antireflection (AR) coatings using the low index provided by wet thermally oxidized Al 0.98Ga 0.02As. We address the design criteria, fabrication, and characterizations of AR coatings composed of

Laser-Focused Atomic Deposition - Nanofabrication via Atom Optics

May 15, 2000
Author(s)
Jabez J. McClelland, Robert Celotta
In conventional molecular-beam epitaxy, atoms from a diffuse source randomly impinge upon a surface, accumulating in atomic layers or islands. We have recently demonstrated an enhancement of this process, in which the trajectories of the atoms are

Information Technology for Engineering and Manufacturing

May 10, 2000
Author(s)
Michael Gruninger, Barbara L. Goldstein, Kevin G. Brady, Simon Szykman, Charles R. McLean, Joshua Lubell
Advances in information technology are frequently cited as the basis for the continued growth of the U.S. economy. Manufacturers use information technology products to increase productivity, to decrease time-to-market, to lower supply chain costs, and to

Quasi-TEM Characteristic Impedance of Micromachined CMOS Coplanar Waveguides

May 5, 2000
Author(s)
Mehmet Ozgur, V. Milanovic, C. A. Zincke, Michael Gaitan, Mona E. Zaghloul
Micromachined coplanar waveguides fabricated in CMOS technology consist of glass-encapsulated finite-thickness metal conductor strips, fully suspended by selective etching of the silicon substrate. Determination of the quasi-TEM mode characteristic

A Millennial View of Fire Suppression

May 4, 2000
Author(s)
Richard G. Gann
The ability to control fire is universally and exclusively human. The history of that controlled use is also the history of civilization. Indeed, it has been so important to our development that no branch of the hominid family tree has survived without it

Superconducting Transition Edge Sensor Bolometer Arrays for Submillimeter Astronomy

May 3, 2000
Author(s)
D. J. Benford, C. A. Allen, A. S. Kutyrev, S. H. Mosely, Rick A. Shafer, James A. Chervenak, Erich N. Grossman, Kent D. Irwin, John M. Martinis, Carl D. Reintsema
Studies of astrophysical emission in the far-infrared and submillimeter will increasingly require large arrays of detectors containing hundreds to thousands of elements. The last few years have seen the increasing from one to a few tens of bolometers on
Displaying 47851 - 47875 of 73830
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