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NIST Authors in Bold

Displaying 47126 - 47150 of 73697

ITL Technical Accomplishments 2000

October 1, 2000
Author(s)
Elizabeth B. Lennon, K K. Simon, M Helfer
The ITL Technical Accomplishments 2000 report presents the achievements and highlights of NIST's Information Technology Laboratory (ITL) during FY 2000. Technical projects in eight divisions are described, followed by industry interactions, international

Josephson Voltage Standards

October 1, 2000
Author(s)
Clark A. Hamilton
This paper reviews the development and use of Josephson voltage standards over the last 30 years, including classical dc standards, programmable standards based on binary weighted arrays, pulse-driven delta-sigma standards for ac wave-form synthesis, and

Low-Cost, Broadband Absorber Measurements

October 1, 2000
Author(s)
David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We present a method for evaluating broadband absorber in a non-ideal testing environment. Using broadband, short impulse TEM horns, a frequency-rich spectrum (equivalent pulse length 0.5 ns) illuminates a sample of material under test and the reflections

Low-Level (Submicromole) Environmental 14 C Metrology

October 1, 2000
Author(s)
Lloyd A. Currie, J D. Kessler, J V. Marolf, A. P. McNichol, D R. Stuart, J C. Donoghue, D. J. Donahue, William Burr, D Biddulph
Accelerator Mass Spectrometry (AMS) measurements of environmental 14C have been employed during the past decade at the several micromole level (10's of ug carbon), but advanced research in the atmospheric and marine sciences demands still higher

Managing Digital Libraries for Computer-Aided Design

October 1, 2000
Author(s)
William Regli, V Cicirello
This paper describes our initial efforts to deploy a digital library to support computer-aided collaborative design. At present, this experimental testbed, The Engineering Design Knowledge Repository, is an effort to collect and archive public domain

Material Properties of Titanium Diboride

October 1, 2000
Author(s)
R G. Munro
The physical, mechanical, and thermal properties of polycrystalline TiB 2 are reviewed with an emphasis on the significant dependence of the properties on the density and grain size of the material specimens. By examining the density and grain size

NIST Data Resources for X-Ray Photoelectron Spectroscopy

October 1, 2000
Author(s)
Cedric J. Powell
A short description is given of data resources that are available from the National Institute of Standards and Technology (NIST) for X-Ray Photoelectron Spectroscopy (XPS). NIST currently has three databases available: an XPS Database (SRD 20), an Elastic

Optical Tunnel-Trap Detector for Radiometric Measurements

October 1, 2000
Author(s)
John H. Lehman, Christopher L. Cromer
We have designed and evaluated an optical trap detector that is simple to fabricate and convenient to use. The trap geometry is a triangular tube similar to a kaleidoscope, with two photodiodes in place of a mirror on each side. One version incorporates

Power Measurement Standards for High-Power Lasers: Comparison Between the NIST and the PTB

October 1, 2000
Author(s)
Xiaoyu X. Li, Thomas Scott, Christopher L. Cromer, Darryl A. Keenan, Friedhelm Brandt, K. Mstl
We report the results of the first laser high-power measurement comparison between the Physikalisch-Technische Bundesanstalt (PTB, Germany), and the National Institute of Standards and Technology (NIST, USA). Laser power transfer standards were calibrated

Privilege Management of Mobile Agents

October 1, 2000
Author(s)
Wayne Jansen, Athanasios T. Karygiannis
Most mobile agent systems use internal data structures within an agent to control and specify its security requirements and properties. These structures typically contain authorization information regarding access to computational resources on distributed

Radiometric Calibration History of MOBY/NIST Single Channel Dual Mode Radiometers

October 1, 2000
Author(s)
Bettye C. Johnson, Steven W. Brown, Howard W. Yoon
In 1996, the National Institute of Standards and Technology (NIST), with the support of the National Atmospheric and Oceanic Administration (NOAA), designed and built two single channel, dual mode radiometers. The radiometers are used to assess the

Radiometric Characterization and Calibration of the Marine Optical System (MOS) for the Marine Optical Buoy (MOBY) Project

October 1, 2000
Author(s)
C Habauzit, Steven W. Brown, Keith R. Lykke, B. Carol Johnson, M Yarbrough, M Feinholz, D K. Clark
The scientific objective of the Marine Optical Buoy (MOBY) project is to measure the downwelling spectral irradiance, E d, and the upwelling spectral radiance, L u, at various depths in the ocean. From these measurements, other quantities can be derived
Displaying 47126 - 47150 of 73697
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