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NIST Authors in Bold

Displaying 52276 - 52300 of 74191

Metallurgical Evaluation of Prestressed Wire Failures

July 1, 1998
Author(s)
Christopher N. McCowan, Thomas A. Siewert
Prestressed concrete pipe, having an inside diameter of 6.4 m (21 ft), was used to construct a series of siphons for the Central Arizona Project.

Microcalorimeter EDS Measurements of Chemical Shifts in Fe Compounds

July 1, 1998
Author(s)
David A. Wollman, Dale E. Newbury, Gene C. Hilton, Kent D. Irwin, L L. Dulcie, Norman F. Bergren, John M. Martinis
Chemical shifts result from changes in electron binding energies with the chemical environment of atoms. In x-ray spectra, chemical shifts lead to changes in x-ray peak positions, relative peak intensities, and peak shapes. These chemical bonding effects

Multiple Similarity Solutions for Solidification and Melting

July 1, 1998
Author(s)
Sam R. Coriell, Geoffrey B. McFadden, R F. Sekerka, William J. Boettinger
We explore multiple one-dimensional similarity solutions during the solidification of a binary alloy and a pure material. The configuration is analogous that of a diffusion couple, for which multiple solutions in ternary alloys were discovered by Coates &

New Approach for Thermoacoustic Refrigeration

July 1, 1998
Author(s)
J Xiao, Ray Radebaugh
We suggest a new design configuration for thermoacoustic refrigeration that optimises the refrigeration effect caused by both the standing wave and the traveling wave. In current thermoacoustic refrigerators the refrigeration effect comes mainly from the

Novel Fine-Membered Ring Intermediates in Gas Phase Reactions

July 1, 1998
Author(s)
R A. Loomis, S R. Leone, M K. Gilles
The review considers the role of closed-ring intermediates in chemistry, in general, and focuses on recent experimental and theoretical works that provide compelling evidence for a five-membered ring intermediate in the gas phase. The reactions of oxygen

Numerical Characterization Of The Discharge Coefficient In Critical Nozzles

July 1, 1998
Author(s)
Aaron N. Johnson, Pedro I. Espina, John D. Wright, G E. Mattingly, C L. Merkle
The discharge coefficient in critical nozzles flowing N 2, Ar, CO 2, and H 2 in the Reynolds Number range (2,000 to 22,000) is studied computationally to assess the capability of Computational Fluid Dynamics (CFD) in assisting experimental calibration. A

Optical Computer Aided Tomography for Plasma Uniformity Measurements

July 1, 1998
Author(s)
Eric C. Benck
Optical Computer aided tomography (CAT) is being investigated as a potential in situ diagnostic for measuring plasma uniformity without making assumptions concerning the plasma symmetry. The presence of an opaque vacuum chamber wall severely limits the

Polarimetric Calibration for Monostatic Radar Systems

July 1, 1998
Author(s)
Lorant A. Muth, Paul D. Domich, B. M. Welsh, A. L. Buterbaugh, B. M. Kent
Calibration standards for radar systems are being developed cooperatively at NIST and DoD measurement facilities. Our goals are to develop standard procedures for polarimetric radar calibrations and to improve the uncertainty in the estimation of system

Power and Energy Measurements at NIST

July 1, 1998
Author(s)
Thomas L. Nelson
The NIST calibration service that provides electric energy traceability for the U.S. utility industry is described. Electronic watthour meters, submitted for test, are measured using the NIST Power Bridge, in which complex ac power is defined in terms of

Project Summaries 1998. NIST Building and Fire Research Laboratory

July 1, 1998
Author(s)
Noel J. Raufaste Jr
NIST's Building and fire Research Laboratory (BFRL), one of NIST's seven Laboratories, enhances the competitivness of U.S. industry and public safety rhgough performance prediction and measurement technologies and technical advances that improve the life

Proposed Pressure Standard Based on Capacitance Measurements

July 1, 1998
Author(s)
Michael R. Moldover
We propose to measure the dielectric constant [epsilon] and the thermodynamic temperatue T of helium near 273.16 K and to calculate the pressure p([epsilon],T) of the helium from the fundamental constants, quantum mechanics, and statistical mechanics. If

Quantitative secondary ion mass spectrometry imaging of self-assembled monolayer films for electron beam dose mapping in the environmental scanning electron microscope

July 1, 1998
Author(s)
John G. Gillen, Scott A. Wight, David S. Bright, T M. Herne
Fluorinated alkanethiol self assembled monolayers (SAM) films immobilized on gold substrates have been used as electron-sensitive resists to map quantitatively the spatial distribution of the primary electron beam scattering in an environmental scanning

Quantitative Surface Analysis for Catalysts by Electron Spectroscopy

July 1, 1998
Author(s)
H Shimada, Cedric J. Powell
An overview is given of a new cooperative project under the Implementing Agreement between the Technology Administration, U.S. Department of Commerce, and the Agency of Industrial Science and Technology, Japanese Ministry of International Trade and
Displaying 52276 - 52300 of 74191
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