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Displaying 48076 - 48100 of 74045

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

Detection and Measurement of Middle Distillate Fuel Vapors Using Tunable Dye Lasers.

May 2, 2000
Author(s)
K L. Mcnesby, R T. Wainner, A W. Miziolek, W M. Jackson, I A. McLaren
A sensor for measurement of vapors from the hydrocarbon-based fuels JP-8, DF-2, and gasoline is described. The sensor is based upon a previously reported laser mixing technique that uses two tunable diode lasers emitting in the near-infrared spectral

MODELING THE EFFECT OF WATER SPRAY SUPPRESSION ON LARGE-SCALE POOL FIRES

May 2, 2000
Author(s)
P E. DesJardin, L A. Gritzo, S R. Tieszen
In practical fire suppression systems for large rooms or compartments, water sprinklers are often located on or near the ceilings. In this configuration, the droplets from the water spray must be large enough to penetrate the high temperature thermal plume

Performance Data on Cold Temperature Dispersion of CF3I

May 2, 2000
Author(s)
Jiann C. Yang, Thomas G. Cleary, Michelle K. Donnelly
Tritluoroiodomethane (CF3I) has been proposed as a potential replacement for Halon 1301 in aircraft engine nacelle and dry bay fire protection applications. The potential use of CF3I in fuel tank ullage inerting has also been considered recently. Before

Performance of a Fast Response Agent Concentration Meter

May 2, 2000
Author(s)
Erik L. Johnsson, George W. Mulholland, Gerald T. Fraser, A Zuban, I I. Leonov
There is a need for monitoring the concentration of potential halon replacement chemicals with millisecond response time [I]. One scenario of great concern to the Air Force is the penetration of an enemy shell into the fuel tank of an aircraft. To prevent

SCREENING OF CANDIDATE FIRE SUPPRESSANTS

May 2, 2000
Author(s)
Marc R. Nyden, Jiann C. Yang, J D. Mather
Exploratory research has indicated that the following chemical families are likely 10 contain chemicals possessing both a high degree of fire suppression efficiency and low environmental impact: the bromoalkenes, bromoethers, and phosphorus-containing
Displaying 48076 - 48100 of 74045
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