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Displaying 49901 - 49925 of 73697

Microleakage of a Consolidted Silver Direct Filling Material

June 1, 1999
Author(s)
F Eichmiller, Anthony A. Giuseppetti, Kathleen M. Hoffman, D R. Brajdic, V Miksch, J A. Delorey-Lytle
Microleakage of an experimental direct filling materisl comprised of a chemically precipitated silver powder that had been surface treated with a dilute acid to promote cold welding upon consolidation was evaluated. Microleakage was compared to both

Molecular Models of Water. I. Derivation and Description

June 1, 1999
Author(s)
A Wallqvist, Raymond D. Mountain
Molecular level computer simulations based on molecular dynamics and Monte Carlo methods have become widely used techniques in the study and modeling of aqueous systems. These simulations of water involve a few hundred to a few thousand water molecules at

Nanoscale Chemical Imaging With Scanning Near-Field Infrared Microscopy

June 1, 1999
Author(s)
Chris A. Michaels, Stephan J. Stranick, Lee J. Richter, Richard R. Cavanagh
The development of a near-field microscope that utilizes infrared absorption as the optical contrast mechanism will be described. This instrument couples the nanoscale spatial resolution of a scanning probe microscope with the chemical specificity of

Neutron Powder Diffraction of Carbon-Coated FeCo Alloy Nanoparticles

June 1, 1999
Author(s)
J H. Scott, K Chowdary, Z Turgut, S. A. Majetich, M E. McHenry
Neutron powder diffraction is used to study the order-disorder transformation in carbon-coated Fe xCo 1-x nanoparticles produced using a radio frequency (RF) plasma torch. The nanoparticles, nominally Fe 50Co 50, are produced from alloy powder and

Non-Uniquenes of the ITS-90 From 13.8033 K to 24.5561 K

June 1, 1999
Author(s)
Christopher W. Meyer, Gregory F. Strouse, Weston L. Tew
The International Temperature Scale of 1990 (ITS-90) is defined in the region 3.0 K to 24.5561 K by an interpolating constant volume gas thermometer (ICVGT) that is calibrated at three specified fixed points. From 13.8033 K to 1234.93 K the ITS-90 is

Observation of Conical Emission From a Single Self-Trapped Beam

June 1, 1999
Author(s)
B D. Paul, Marla L. Dowell, Alan Gallagher, J W. Cooper
We report observations of conical emission from a pulsed laser beam with incident laser power, detuning, and beam diameter matched to a range of single, steady-state filaments. The beam thus propagates with nearly constant diameter through 5 cm of

Opening Up to Standardization

June 1, 1999
Author(s)
Barbara L. Goldstein, J. Cartwright
Today's electronics manufacturers are expected to reduce their time-to-market cycles and lower total costs simultaneously. Product development cycles and volume ramp-up times are rapid, and corresponding end-of-life production is dramatic. This environment

Operating Conditions for a Pulse-Quantized AC and DC Bipolar Voltage Source

June 1, 1999
Author(s)
Samuel Benz, Charles J. Burroughs, Todd E. Harvey, Clark A. Hamilton
We have developed an accurate ac and dc bipolar voltage source based on the quantized pulses of Josephson junctions. A factor-of-6 increase in output voltage over previous unipolar waveforms is achieved by generating bipolar waveforms where arrays of

Operating Margins for a Superconducting Voltage Waveform Synthesizer

June 1, 1999
Author(s)
Samuel Benz, Clark A. Hamilton, Charles J. Burroughs
Operating margins for biolar superconducting voltage waveform synthesizer were measured. Current ranges were determined for 101 equally spaced dc voltage steps between - 18.6 and + 18.6 mV. The measured voltages of these steps deviated from the expected

Optical Linewidth Models: Then and Now

June 1, 1999
Author(s)
Robert D. Larrabee, Richard M. Silver, M P. Davidson
In the late 1970's, Dr. Diana Nyyssonen demonstrated that NIST could optically calibrate photomask linewidth standards that were narrower than the classical resolution limit of a conventional bright-field microscope. She equated the known position of the

Passivation, Transition Width, and Noise for YBCO Bolometers on Silicon

June 1, 1999
Author(s)
Donald G. McDonald, Robert J. Phelan, Leila R. Vale, Ronald H. Ono, David A. Rudman
We are developing Yba 2Cu 3O 7-x (YBCO) thermometers for large area bolometers that include a heater for calibration by the electrical substitution of power. Because YBCO on buffered Si is under mechanical stress and must be very thin to avoid cracking, we

Performance of Tape-Bonded Seams of EPDM Membranes: Resistance to Peel-Creep

June 1, 1999
Author(s)
Walter J. Rossiter Jr, M Vangel, K M. Kraft
This paper provides a summary of the major results of an industry-government consortium study on the creep resistance of tape-bonded seams of EPDM roof membranes. The study was undertaken to compare the creep-rupture performance of tape-bonded and liquid

Pulsed, Single-Mode Cavity Ringdown Spectroscopy

June 1, 1999
Author(s)
Roger D. van Zee, Joseph T. Hodges, J P. Looney
This paper demonstrates an implementation of single mode cavity ring-down spectroscopy, using a pulse laser system, with near shot-noise limited sensitivity. The rationale for this approach is discussed, the experimental apparatus is described, and the

Raising the Bar on Software Security Testing

June 1, 1999
Author(s)
Alden A. Dima, John P. Wack, S A. Wakid
This article describes an effort lead by NIST and NSA to define and promote an open and commercially driven set of testing methods for software security through the National Information Assurance Partnership (NIAP) (see http://niap.nist.gov). This

Re-Configurable Distributed Scripting

June 1, 1999
Author(s)
Mudumbai Ranganathan, L S. Andrey, V Schaal, J Favreau
A large class of distributed testing, control and collaborative applications are reactive or event driven in nature. Such applications can be structured as a set of handlers that react to events and that in turn can trigger other events. We have developed
Displaying 49901 - 49925 of 73697
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