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Displaying 49076 - 49100 of 74178

Acoustic Evidence Against BCS Behavior in Monocrystal YBa 2 Cu 3 0 7

November 1, 1999
Author(s)
M Lei, Albert Migliori, H M. Ledbetter
Using a detwinned YBa 2Cu 30 7 monocrystal and acoustic-resonance spectroscopy, we measured internal friction Q- = A If through the 91-K superconducting-transition temperature. We show measurements for the first ten macroscopic resonance frequencies f r

An Information System to Support Calibration

November 1, 1999
Author(s)
Kevin G. Brady
The National Institute of Standards and Technology (NIST) performs calibrations that achieve the highest level of measurement quality for the makers and users of precision devices world-wide. The information system that administers these calibrations

Antenna-Coupled Niobium Bolometers for MM-Wave Imaging Arrays

November 1, 1999
Author(s)
Shalva Nolen, Jonathan A. Koch, Nicholas Paulter, Carl D. Reintsema, Erich N. Grossman
Antenna-coupled thin-film niobium microbolometers designed for mm-wave imaging arrays have been fabricated and their electrical properties measured. The niobium bolometers are operated at room temperature and are located at the feeds of half-wave dipole

Applicability of Metrology to Information Technology

November 1, 1999
Author(s)
M M. Gray
In 1959, the Director of the National Bureau of Standards declared The emergence of science and technology as the paramount concern of the Nation in the 20th century demanded the highest order of measurement competence, in order to provide the standards

Application of Laser Polarimetry to the Measurement of Specific Heat Capacity and Enthalpy of the Alloy 53Nb-47Ti (mass%) in the Temperature Range 1600 K to 2000 K by a Millisecond-Resolution Pulse Heating Technique

November 1, 1999
Author(s)
D Basak, Ursula R. Kattner, J L. McClure, Daniel Josell, A Cezairliyan
The determination of the specific heat capacity, enthalpy and electrical resistivity of the alloy, 53Nb-47Ti (mass%), in the temperature range 1600 K to 2000 K is described. The method is based on rapid resistive self-heating of a solid cylindrical

Arrayed DBR Waveguide Lasers for the ITU Grid

November 1, 1999
Author(s)
D. L. Veasey, David S. Funk, Gregory E. Obarski, M. A. Mccoy, M. P. Bendett, Joseph S. Hayden
Waveguide lasers fabricated in Yb/Er-codoped phosphate glass operating at wavelengths between 1520-1590 nm are promising low-cost laser sources for use in future DWDM Systems and in WDM component test beds.

Broadband Electromagnetic Field Sensors with Electro-Optical Links

November 1, 1999
Author(s)
Keith D. Masterson, Motohisa Kanda, David R. Novotny
In this paper, we review the system design, antenna structures, and optoelectronic components that can be used to accurately measure electromagnetic (EM) fields at frequencies up to 100 GHz, in support of the technologies of telecommunications, materials

Challenges in Capturing Oxygenase Activity In Vitro

November 1, 1999
Author(s)
V L. Vilker, Vytautas Reipa, M P. Mayhew, Marcia J. Holden
Biocatalysis using oxygenase or desaturase enzymes has the potential to add value to native fats and oils by adding oxygen hydroxyl groups, or double bonds to create regio- and/or stereospecific products. These enzymes are a subset of the large class of

Charge Lamp BAsed on MgH RAdiation

November 1, 1999
Author(s)
S Ukegawa, Alan Gallagher
We report the efficacy and spectrum of an inductively-coupled, radio-frequency discharge in mixtures of magnesium (Mg), hydrogen (H 2), and argon vapor. The predominantly green emission is dominated by the A-X band of MgH, plus some Mg lines. The discharge

Deployment Test of the NIST EOS Thermal-Infrared Transfer Radiometer

November 1, 1999
Author(s)
Joseph P. Rice, S C. Bender, W H. Atkins, Francis J. Lovas
The National Institute of Standards and Technology (NIST) Thermal-infrared Transfer Radiometer (TXR), developed for the National Aeronautics and Space Administration (NASA) Earth Observing System (EOS), was deployed at the remote sensing radiometric

Direct Blind Deconvolution

November 1, 1999
Author(s)
Alfred S. Carasso
Blind deconvolution seeks to deblur an image without knowing the cause of the blur. Iterative methods are commonly applied to that problem, but the iterative process is slow, uncertain, and often ill-behaved. This paper considers a significant but limited

Dynamic Power-Conscious Routing for MANETs: An Initial Approach

November 1, 1999
Author(s)
M W. Subbarao
We develop an initial dynamic power-conscious routing scheme (MPR) that incorporates physical layer and link layer statistics to conserve power, while compensating for the channel conditions and interference environments at the intended receiver. The aim

Embedded Systems and the Year 2000 Problem

November 1, 1999
Author(s)
G E. Fisher, M Cherry
Much has been written about embedded systems and how they will be affected by the year 2000 problem. During the first 6 months of 1999, a significant amount of conflicting information was spread about the outlook for fixing systems that rely on embedded
Displaying 49076 - 49100 of 74178