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Displaying 52101 - 52125 of 74034

Fabrication of High-Value Standard Resistors

July 1, 1998
Author(s)
Ronald F. Dziuba, Dean G. Jarrett, L. L. Scott, Andrew J. Secula
The National Institute of Standards and Technology (NIST) has fabricated stable, transportable 10 MΩ} and 1 GΩ} standard resistors for use in an international comparison of high resistances. This fabrication process is being applied to the construction of

Fire Fighting Properties (NISTIR 6191)

July 1, 1998
Author(s)
D W. Stroup, Daniel M. Madrzykowski
Water uses several different mechanisms to suppress and extinguish fires: fuel cooling, flame cooling, oxygen displacement and reduction of radiation feedback to the fuel. Laboratory experiments were conducted to determine which of these mechanisms play

Fourth International Conference on Chemical Kinetics

July 1, 1998
Author(s)
Robert E. Huie, Jeffrey W. Hudgens
The Fourth International Conference on Chemical Kinetics was held July 14-19, 1997, at the National Institute of Standards and Technology in Gaithersburg, MD. The conference was attended by 200 scientists from 21 countries. Topics discussed included small

Glassy Alloys as Potential Bearing Surfaces for Orthopaedic Implants

July 1, 1998
Author(s)
John A. Tesk, C E. Johnson
Glassy (amorphous) metals have some unique properties that may renderthem attractive candidates for the coating of metal-implant bearing surfaces. Metastable glasses of metal alloys, with uniform compositions and homogeous structures that are not

High Efficiency, Dual Collection Mode Near-Field Scanning Optical Microscope

July 1, 1998
Author(s)
Stephan J. Stranick, Lee J. Richter, Richard R. Cavanagh
We have developed a near-field scanning optical microscope that provides simultaneous transmission and reflection mode measurements while concurrently recording a topograph of the sample surface. In this microscope design, an ellipsoidal cavity is used to

Hydration for a Series of Hydrocarbons

July 1, 1998
Author(s)
Raymond D. Mountain, D Thirumalai
The hydrophobic hydration in a series of hydrocarbons is probed using molecular dynamics simulations. The solutes considered range from methane to octane. Examination of the shapes of the hydration shell suggests that there is not a stable clatharate-like

Improvements in 10 Kilohm Resistance Measurements at NIST

July 1, 1998
Author(s)
L. L. Scott
The 10 kilohm measurement system at the National Institute of Standards and Technology has been improved. The guarded resistance bridge is based on the Warshawsky bridge model and is self-balancing through the use of a precision feedback system. A unique

International Comparison of Noise-Temperature Measurements at 2, 4, and 12 GHz

July 1, 1998
Author(s)
James P. Randa, J. Achkar, F. I. Buchholz, T. Colard, D. Schubert, M. Sinclair, John Rice, G. S. Williams
We report results of a recent international comparison of thermal noise-power measurements, performed under the auspices of CIPM/CCE. The noise temperatures of two solid-state sources with GPC-7 connectors were measured at 2, 4, and 12 GHz. All results

Introduction (NISTIR 6191)

July 1, 1998
Author(s)
Daniel M. Madrzykowski
The Building and Fire Research Laboratory (BFRL) of the National Institute of Standards and Technology (NIST), under the sponsorship of the United States Fire Administration (USFA), has conducted a series of experiments to demonstrate the suppression

Mean Recurrence Intervals of Ultimate Wind Loads

July 1, 1998
Author(s)
Emil Simiu, A N. Heckert, T Whalen
The attention of wind engineers and extreme value climatologists has been focused in the last few decades on estimates of basic windspeeds, that is, wind speeds with 50 year or 100 year mean recurrence intervals (MRIs). Recently, however, efforts have been

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
Displaying 52101 - 52125 of 74034
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