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Displaying 52126 - 52150 of 74034

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

Reinterpretation of the Spectra of Hydrated Co++: An ab initio Study

July 1, 1998
Author(s)
H S. Gilson, Morris Krauss
The absorption spectrum of aqueous Co++ is reinterpreted in light of ab initio calculations. MCSCF and MR-MP calculations yield the spectral states and their oscillator strengths, as well as the spin-orbit coupling between the quartet and doublet states of

Resistance Measurement Assurance Program at NIST

July 1, 1998
Author(s)
Ronald F. Dziuba, June E. Sims
The National Institute of Standards and Technology (NIST) offers resistance Measurement Assurance Program (MAP) transfers at the 1 ohm} and 10 kohm} levels, to provide a method of assessing and maintaining the quality of a customer's measurement process

Seismic Performance of Masonry Walls With Bed Joint Reinforcement

July 1, 1998
Author(s)
A E. Schultz, R S. Hutchinson, Geraldine Cheok
In-plane cyclic load tests of partially grouted concrete masonry shear walls with bed joint reinforcement are presented. Specimen design and construction, and simulated seismic testing procedures, are summarized. Lateral force resistance mechanisms are

Shear Viscosity and Dielectric Constant of Liquid Methanol

July 1, 1998
Author(s)
Raymond D. Mountain
Molecular dynamics simulations for liquid methanol are used to estimate the dielectric constant and shear viscosity. A rigid, fixed-charge, three-site model is used. Three similar models that have been proposed provide estimates for these liquid methanol
Displaying 52126 - 52150 of 74034
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