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NIST Authors in Bold

Displaying 46026 - 46050 of 73994

State-of-the-Art Research Is the Future of Fire Investigation

March 1, 2001
Author(s)
Daniel M. Madrzykowski
Researchers at the National Institute of Standards and Technology's Building and Fire Research Laboratory are working with the U.S. Fire Administration; the bureau of Alcohol, Tobacco, and Firearms; and the U.S. Department of Justice to provide a more

Studying the Buried Interfacial Region With an Immobilized Fluorescence Probe

March 1, 2001
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. VanZanten, Joy Dunkers, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The properties of a buried epoxy / glass interfacial region were studied by covalently grafting a fluorescent probe to the glass surface. A dimethyl-amino-nitrostilbene (DMANS) fluorophore was tetherred to a triethoxy silane-coupling agent, generating a

Sub-Picowatt Precision Radiometry Using Superconducting Transition Edge Sensor Bolometers

March 1, 2001
Author(s)
James A. Chervenak, Erich N. Grossman, Carl D. Reintsema, Kent D. Irwin, S. H. Mosely, C. A. Allen
We describe a cryogenic radiometric calibration system suitable for high sensitivity, low power bolometers. The system uses a variable temperature blackbody source capable of temperatures of 4-20 K, whose output covers the sub-millimeter wavelength regime

Suppression of Flux Jumps in Marginally Stable Niobium-Tin Superconductors

March 1, 2001
Author(s)
Ronald B. Goldfarb, Loren F. Goodrich, T Pyon, E. A. Gregory
Niobium-tin superconductor wires with coalesced filaments may have reduced adiabatic stability. Magnetization measurements on such marginally stable conductors exhibit flux jumps, which appear as a sudden decrease in magnetization as the applied field is

Suppression of Lateral Phase Separation in Thin Polyolefin Blend Films

March 1, 2001
Author(s)
Y A. Akpalu, Alamgir Karim, Sushil K. Satija, N P. Balsara
The effectiveness of a compatibilizer in suppressing lateral phase separation in thin polyolefin blend films is investigated as a function offilm thickness and temperature. Neutron and x-ray reflectivity measurements were made on spun cast thin blend films

The Development of Fluorescence Intensity Standards

March 1, 2001
Author(s)
Adolfas K. Gaigalas, L. Li, O. Henderson, R F. Vogt, J. Barr, G E. Marti, J. Weaver, A. Schwartz
The use of fluorescence as an analytical technique has been growing over the last 20 years. A major factor in inhibiting more rapid growth has been the inability to make comparable fluorescence intensity measurements across laboratories. NIST recognizes

The Importance of Focused Evaluations: A Case Study of TREC and DUC

March 1, 2001
Author(s)
Donna K. Harman
Evaluation has always been an important part of scientific research, and in information retrieval, this evaluation has mostly been done using test collections. In 1992, a new test collection was built at the National Institute of Standards and Technology

The Infrared Spectra of the NH 3 -d n + Cations Trapped in Solid Neon

March 1, 2001
Author(s)
Warren E. Thompson, Marilyn E. Jacox
When a dilute mixture of NH 3 in neon is subjected to Penning ionization and/or photoionization by neon atoms in their first excited states, between 16.6 eV and 16.85 eV, and the products are rapidly frozen at approximately 5 K, the infrared spectrum of

The Interoperable Message Passing Interface (IMPI) Extensions to LAM/MPI

March 1, 2001
Author(s)
J M. Squyers, A Lumsdaine, William L. George, John G. Hagedorn, J E. Devaney
Interoperable Message Passing Interface (IMPI) is a protocol specification to allow multiple MPI implementations to cooperate on a single MPI job. Unlike portable MPI implementations, an IMPI-connected parallel job allows the use of vendor-tuned message

The Raman Spectra of Cr 3 O 8 and Cr 2 O 5

March 1, 2001
Author(s)
James E. Maslar, Wilbur S. Hurst, Terrell A. Vanderah, Igor Levin
The Raman spectra of polycrystalline Cr 3O 8 and Cr 2O 5 powders were measured. The powders were prepared by thermal decomposition of CrO 3 under flowing oxygen. Their composition was verified with x-ray diffraction. Raman spectra were excited with both

Thermal Conductivity and Thermal Diffusivity of Selected Oxide Single Crystals

March 1, 2001
Author(s)
A Stanimirovic, N M. Balzaretti, A Feldman, J Graebner
Values for the thermal conductivity k and the thermal diffusivity D of four oxide single crystals have been obtained. Near room temperature the values are: LaAlO 3, k = 0.115 Wcm -1K -1, D = 0.0446 cm 2s -1., NdGaO 3, k = 0.068 Wcm -1K -1, D=0.0197 cm 2s

Time Dependent Breakdown of Ultra-Thin Gate Dielectrics Under Pulsed Biased Stress

March 1, 2001
Author(s)
Bin Wang, John S. Suehle, Eric M. Vogel, J B. Bernstein
Ultra-thin SiO 2 films (t ox 2.0 nm) were stressed under DC, unipolar, and bipolar pulsed bias conditions up to a pulse repetition frequency of 50 kHz. The time-to-breakdown (t BD), the number of defects at breakdown (N^dBD), and the number of defects

Time Measurement at the Millennium

March 1, 2001
Author(s)
James C. Bergquist, Steven R. Jefferts, David J. Wineland
The latest clocks use a single ion to measure time with an anticipated precision of on part in 10 18

Total Hadamard Variance: Application to Clock Steering by Kalman Filtering

March 1, 2001
Author(s)
David A. Howe, Ron Beard, Chuck Greenhall, Francois Vernotte, Bill Riley
The Total variance approach has been developed for increasing the confidence of the estimation of the classical Allan variance, particularly for large integration times. This method is based on a procedure involving extension of the original data. Recently

Transition Edge Sensor Array Development

March 1, 2001
Author(s)
Steven Deiker, James A. Chervenak, Gene C. Hilton, Kent D. Irwin, John M. Martinis, Sae Woo Nam, David A. Wollman
NIST is fabricating multi-pixel arrays of our transition edge sensor (TES) microcalorimeter detectors for use in microanalysis and x-ray astrophysics. We have developed room temperature digital feedback electronics and a successful SQUID multiplexing

Ugo Fano (1912-2001) - Obituary

March 1, 2001
Author(s)
Charles W. Clark
An obituary of Ugo Fano (1212-2001), member of the National Bureau of Standards staff from 1946 to 1966.

Updating a Turning Center Error Model by Singular Value Decomposition

March 1, 2001
Author(s)
David E. Gilsinn, Herbert T. Bandy, Alice V. Ling
The precision of manufacturing using machine tools depends on the accuracy of the relative position of the cutting tool with respect to the workpiece. Kinematic modeling of machine tools is used to describe this relative position. This motion can be
Displaying 46026 - 46050 of 73994
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