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Displaying 52176 - 52200 of 74191

Systematic Errors in ab Initio Bond Dissociation Energies

August 1, 1998
Author(s)
Karl K. Irikura
Bond dissociation energies (D o) for 41 small molecules were calculated at 19 levels of ab initio theory up to CCSD(T)/cc-pVTZ, using geometries and vibrational zero-point energies from B3LYP/6-31G* hybrid density-functional calculations. Empirical

The Next Generation of the NIST Watt Balance

August 1, 1998
Author(s)
David B. Newell, Richard L. Steiner, Edwin R. Williams, Alain Picard
Reduction in the total uncertainty of the NIST Watt Balance is limited by the present configuration of the experiment. Most of the major relative uncertainty components arise from the fact that the experiment is performed in air. To reduce the contribution

The NIST EOS Thermal-Infrared Transfer Radiometer

August 1, 1998
Author(s)
Joseph P. Rice, Bettye C. Johnson
A portable thermal infrared transfer radiometer (TXR) has been developed for use in comparisons and scale verifications of sources used to calibrate thermal- infrared (TIR) channels of the National Aeronautics and Space Administration's (NASA's) Earth

Thermodynamic Properties of Air at Pressures to 2000 MPa

August 1, 1998
Author(s)
William M. Haynes, Eric W. Lemmon, Daniel G. Friend, R Jacobsen
A new formulation for the thermodynamic properties of standard dry air at pressures to 2000 MPa has been developed. This formulation, which can be used at temperatures from the freezing liquid line to 2000 K, is based on comprehensive experimental

What Are the Lights on Your Surge Protector Telling You

August 1, 1998
Author(s)
Francois D. Martzloff
Surge-Protective devices (SPD) applied in low-voltage ac power circuits should be provided with appropriate means to disconnect a failed SPD from the power system and provide a clear indication of the SPD status. This objective has not been consistently

Proceedings of the 1998 DARPA/NIST Smart Spaces Workshop

July 30, 1998
Author(s)
Vincent M. Stanford
Given a visionary scenario for the uses of Smart Space and an introduction from Kevin Mills and Jean Scholtz of DARPA, and Marty Herman of NIST on a possible research agenda, the workshop participants were divided into four groups, each addressing a

A Thermodynamic Investigation of Reactions Catalyzed by Tryptophan Synthase

July 27, 1998
Author(s)
N Kishore, Yadu D. Tewari, D Akers, Robert N. Goldberg, E. W. Miles
Microcalorimetry and high-performance liquid chromatography have been used to conduct a thermodynamic investigation of the following reactions catalyzed by the tryptophan synthase [alpha] 2[Beta] 2 complex (EC 4.2.1.20) and its subunits:indole(aq) + L

Absorption Line Evaluation Methods for Wavelength Standards

July 22, 1998
Author(s)
C. J. Zhu, Leonard M. Hanssen
Two methods for absorption line (peak) evaluation based on center of gravity (CG) calculations are described and compared using spectra of the NIST standard reference material (SRM) 1921(a) characterization measurements. These methods are (1) calculating

Kinetics and Mechanism of the Reaction of NH 2 with O 2 in Aqueous Solutions

July 15, 1998
Author(s)
B Laszlo, Z B. Alfassi, Pedatsur Neta, Robert E. Huie
The reaction of NH 3 with OH or SO 4 radicals produces the aminyl radical, NH 2. Pulse radiolysis and laser flash photolysis techniques were utilized to study the formation of this radical, its absorption spectrum, its reaction with O 2, and the mechanism

Step Bunching: Influence of Impurities and Solution Flow

July 14, 1998
Author(s)
A A. Chernov, P G. Vekilov, Sam R. Coriell, B T. Murray, Geoffrey B. McFadden
Step bunching results in striations even at relatively early stages of its development and in inclusions of mother liquor at the later stages. Therefore, eliminating step bunching is crucial for high crystal perfection. The nature of step bunching
Displaying 52176 - 52200 of 74191
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