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Displaying 50351 - 50375 of 73697

SO x Radical Monoanions--Reactions in Solution and in the Gas Phase

February 1, 1999
Author(s)
Robert E. Huie, L W. Sieck
Sulfur dioxide, SO 2, is a major air pollutant and a natural trace atmospheric constituent. The major anthropogenic source of SO 2 is the combustion of fossil fuels, although much also arises from scrubbing natural gas and from smelting sulfide ores (1)

Structure and Spectroscopy of Metallo-Lactamase Active Sites

February 1, 1999
Author(s)
H S. Gilson, Morris Krauss
This study clarifies the relationship between the active-site geometry of the bimetallic enzyme, zinc-Β-lactamase, and the electronic spectra of the cobalt substituted enzyme. Ab initio quantum methods were used to study both the structure and spectroscopy

The EXPRESS Web Server

February 1, 1999
Author(s)
Joshua Lubell, David A. Sauder
The EXPRESS Web Server is a World Wide Web interface for standards developers creating specifications for STEP, the Standard for the Exchange of Product Model data (officially ISO 10303). The Server enables users to run applications needed to build and

The NIST Microwave Power Standards in Waveguide

February 1, 1999
Author(s)
J. W. Allen, Fred R. Clague, N T. Larsen, M. P. Weidman
The National Institute of Standards and Technology (NIST) microwave power standards in waveguide consist of automated microcalorimeters and associated transfer standards. Each transfer standard is a bolometric dc substitution power detector (a thermistor

The Palladium-Zirconium Phase Diagram

February 1, 1999
Author(s)
Richard M. Waterstrat, Alexander J. Shapiro, A Jeremie
The palladium-zirconium phase diagram has been re-investigated over its entire composition range. The revised diagram includes two intermediate phases. Pd 4Zr 3 and Pd 11Zr 9, which did not appear in previous studies. The crystal structures of the new

Ultrasonic Measurement of Stress in Railroad Wheels

February 1, 1999
Author(s)
R E. Schramm
Acoustic birefringence is the relative change in sound velocity with polarized direction. While the effect is small (usually parts in 10 4), this is a useful tool to probe stress and metallurgical texture since these generate anisotropic changes in the

Viscoelasticity of Xenon Near the Critical Point

February 1, 1999
Author(s)
Robert F. Berg, Michael R. Moldover, G A. Zimmerli
Using a novel, overdamped, oscillator flown aboard the Space Shuttle, we measured the viscosity of xenon near the liquid-vapor critical point in the frequency range 2 Hz [less than or equal to} f {less than or equal to} 12 Hz. The measured viscosity

Voight Function Model in Diffraction-Line Broadening Analysis

February 1, 1999
Author(s)
Davor Balzar
Diffraction-line broadening routes are briefly reviewed. Both luboratory and synchrotron X-ray measurements of W and MgO showed that a Voigt function satisfactory fits the physically broadened line profiles. The consequences of an assumed Voigt function

Simulated-eye-design Camera for High-Contrast Measurements

January 30, 1999
Author(s)
Edward F. Kelley
Light-measurement instrumentation based upon high-quality charge-coupled-devices (CCD) is currently in use for measuring the characteristics of electronic displays. When such array detectors are used to measure scenes having high contrasts or wide color

Using Raman Imaging to Detect Oxidative Stress Events in Plant Tissues

January 30, 1999
Author(s)
B M. Allen, Anne L. Plant
Raman Imaging represents the union of Raman spectroscopy and optical microscopic imaging. This non-invasive vibrational scattering technique allows one to simultaneously spatially (approximately} 1 micron) and spectrally (approximately} 7 wavenumbers)

The Use of Cyclic Phosphazene Additives to Enhance the Performance of the Head/Disk Interface

January 29, 1999
Author(s)
H J. Kang, Q Zhao, F E. Talke, D J. Perettie, B M. DeKoven, T A. Morgan, Daniel A. Fischer, Stephen M. Hsu, C S. Bhatia
Phase separation of phosphazene additives in perfluoropolyalkylether (PFPAE) lubricants is investigated as a function of additive concentration and lubricant layer thickness. The tribological behavior of various phosphazene additive/lubricant mixtures is
Displaying 50351 - 50375 of 73697
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