NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 51776 - 51800 of 73697

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

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
Displaying 51776 - 51800 of 73697
Was this page helpful?