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 49626 - 49650 of 74075

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

Research on Combustion of Black-Liquor Drops

June 1, 1999
Author(s)
A Macek
Black liquor, the major by-product of the kraft process for production of pulp, is one of the most important industrial fuels. It is burned in recovery boilers in the form of large spray drops (mm), with the objective of simultaneous recovery of heat and

Role of Oxygen Pressure during Deposition on the Microwave Properties of YBCO Films

June 1, 1999
Author(s)
David A. Rudman, F. J. Stork, James Booth, J. Y. Juang, Leila R. Vale, G. J. Beatty, C. I. Williams, James A. Beall, Ronald H. Ono, S. B. Qadri, M. S. Osofsky, E. F. Skelton, John H. Claassen, G. Gibson, J. L. MacManus-Driscoll, N. Malde, L. F. Cohen
We have studied the effect of oxygen pressure (PO 2) during pulsed laser deposition on the properties of YBCO films, with particular attention to the low power microwave surface resistance R s.

Shape Parameter for a Non-Axisymmetric Isothermal Dendrite

June 1, 1999
Author(s)
Geoffrey B. McFadden, Sam R. Coriell, R F. Sekerka
In previous work, we found approximate solutions for paraboloids having perturbations with four-fold axial symmetry in order to model dendritic growth in cubic materials. These solutions provide self-consistent corrections through second order in a shape

Simultaneous Optimization of Linear and Nonlinear Microwave Response of YBCO Films

June 1, 1999
Author(s)
James Booth, James A. Beall, David A. Rudman, Leila R. Vale, Ronald H. Ono, Christopher L. Holloway, S. B. Qadri, M. S. Osofsky, E. F. Skelton, J. H. Claasen, G. Gibson, J. L. MacManus-Driscoll, N. Malde, L. F. Cohen
We present results of a systematic study of the effect of film deposition temperture on both the linear and nonlinear response of super-conducting Yba 2Cu 3O7-γ^ (YBCO) thin films and devices at microwave frequencies. Measurements of the unpatterned films

Software to Optimize the Testing of Mixed-Signal Devices

June 1, 1999
Author(s)
Gerard N. Stenbakken, Andrew D. Koffman, T. M. Souders
New software is now available to help test and measurement engineers optimize the testing of complex electronic devices. Examples of products that are benefiting from this software range from A/D and D/A converters to multi-range precision instruments. The

Standard Reference Materials: Tin Freezing-Point Standard - SRM 741a

June 1, 1999
Author(s)
Gregory F. Strouse, N P. Moiseeva
The freezing point of tin (231.928 degrees C) is a defining fixed point of the International Temperature Scale of 1990 (ITS-90). Realization of this freezing point is performed using a fixed-point cell containing high-purity ({> or =} 99.9999 % pure) tin

Substrate Specificity of Deinococcus Radiodurans Fpg Protein

June 1, 1999
Author(s)
K. J. Tuerk, C Bauche, J Laval, M. Dizdaroglu
A DNA repair enzyme has recently been isolated from the ionizing radiation-resistant bacterium Deinococcus radiodurans (Bauche, C. and Laval, J. (1999) J. Bacteriol. 181, 262-269). This enzyme is a homologe of the Fpg protein of Escherichia coli. We

Superconducting Thin-Film Transformers at Microwave Frequencies

June 1, 1999
Author(s)
A. H. Miklich, J. X. Przybysz, T. J. Smith, Samuel Benz, Todd E. Harvey
We describe the use of thin-film superconducting transformers at frequencies up to 20 GHz. Transformers with turns ratios of 2,3, and 7 were fabricated out of Nb and tested in a liquid-He Dewar. The measured S-parameters showed considerably less bandwidth
Displaying 49626 - 49650 of 74075