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Displaying 52251 - 52275 of 74036

Pulse-Driven Josephson Digital/Analog Converter

June 1, 1998
Author(s)
Samuel Benz, Clark A. Hamilton, Charles J. Burroughs, Todd E. Harvey, Laurie Christian, J. X. Przybysz
We have designed and demonstrated a pulse-driven Josephson digital/analog converter. When used as a programmable voltage standard, this device can synthesize metrologically accurate ac waveforms as well as stable dc voltages. We show through simulations

Requirements Analysis: Process Plan Specification - Workstation Level

June 1, 1998
Author(s)
Kimberley Ellis, Albert T. Jones, Yung-Tsun Lee
The Computer-Aided Manufacturing Engineering (CAME) program is developing a number of integrated software toolkits for design, manufacturing engineering, and production operations. One of these toolkits is the Manufacturing Engineering ToolKit (METK). The

Stability of Multilayer Structures: Capillary Effects

June 1, 1998
Author(s)
Daniel Josell, W Carter, John E. Bonevich
The long term stability of multilayer materials composed of nonreactive, immiscible materials is related to the equilibrium shapes of the individual grains within the layers. These shapes are determined by the free energies and locations of the interfaces

Standard Test Methods and Data for Modeling Crashworthiness

June 1, 1998
Author(s)
Richard J. Fields, Timothy J. Foecke, Roland deWit, G E. Hicho, Lyle E. Levine
This report determines what data is typically needed for models predicting crash behavior, reviews the methods available to obtain such data, and identifies standard test methods that need to be developed to supply these data. The data needed are those

The Performance of Transit Time Flowmeters in Heated Gas Mixtures

June 1, 1998
Author(s)
John D. Wright
An ultrasonic transit time flowmeter was tested over Reynolds numbers from 1000 to 100,000 in a calibration facility that generates gas flows with controlled temperature and composition. The gas mixtures were composed of air, nitrogen, carbon dioxide

Thermal Plasma Synthesis of Fe-Co Alloy Nanoparticles

June 1, 1998
Author(s)
J H. Scott, Z Turgut, K Chowdary, M E. McHenry, S. A. Majetich
FeCo nanoparticles are synthesized in a radio frequency (RF) plasma torch from metal powder precursors and simple gases. The first precursor consists of pre-alloyed FeCo powder; the second precursor is a mixture of elemental Fe and Co powders. A protective

Thermodynamic Properties for the Alternative Refrigerants

June 1, 1998
Author(s)
Mark O. McLinden, Eric W. Lemmon, R. T. Jacobsen
Models commonly used to calculate the thermodynamic properties of refrigerants are summarized. For pure refrigerants, the virial, cubic, Martin-Hou, Benedict-Webb-Rubin, and Helmholtz equations of state and the extended corresponding states model are

Time-Base Nonlinearity Determination Using Iterated Sine-Fit Analysis

June 1, 1998
Author(s)
Gerard N. Stenbakken, J. P. Deyst
A new method is presented to determine the time-base errors of sampling instruments. The method does not require a model for the time-base error and, thus, provides accurate estimates where model-based methods fail. Measurements of sinewaves at multiple

Time-Resolved Studies of Ultra-Cold Ionizing Collisions

June 1, 1998
Author(s)
C R. Orzel, S Bergeson, S L. Rolston, S Kulin
Using 40 ns laser pulses, we probe the real-time dynamics of ultra-cold ionizing collisions in metastable xenon. We time-resolve both shielding and enhancement effects, and observe the production of Xe2+ molecular ions through associative ionization. We

Toward a Unified Advanced CD-SEM Specification for Sub 0.18 Micrometer Technology

June 1, 1998
Author(s)
J Allgair, C Archie, W Banke, H Bogardus, J Griffith, H Marchman, Michael T. Postek, L Saraf, J Schlesinger, B Singh, N. Sullivan, L Trimble, Andras Vladar, A Yanof
The stringent critical dimension (CD) control requirements in cutting edge device facilities have placed significant demands on metrologists and upon the tools they use. We are developing a unified, advanced critical dimension scanning electron microscope

VRML Test Case Generation and Evaluation Using Java

June 1, 1998
Author(s)
Leonard E. Gebase, Mary C. Brady, Alden A. Dima, Lynne S. Rosenthal
A well-established approach to conformance testing is to treat the implementation being tested as a black box. With this approach, a reference implementation is built to control and evaluate the implementation being tested, and a supporting implementation

WebSubmit: Web-Based Applications With Tcl

June 1, 1998
Author(s)
R P. McCormack, J E. Koontz, J E. Devaney
WebSubmit is a Web-based framework providing seamless access to applications on a collection of heterogeneous computing systems. Strong authentication methods allow users to execute tasks on remote systems as if they were directly connected. Each

X-Ray Transition Energies -- New Comprehensive Evaluation

June 1, 1998
Author(s)
R Deslattes, Ernest G. Kessler, Paul Indelicato, E Lindroth
In this brief report we describe some of the background for our continuing efforts toward a new comprehensive data base for x-ray transitions, and indicate the present status of this effort, one that is still a work in progress. In contrast to previous

Quality Control Procedures for the NIST/EPA/NIH Mass Spectral Library

May 31, 1998
Author(s)
C L. Clifton, S G. Lias, Anzor I. Mikaia, O D. Sparkman, Stephen Stein, Dmitrii Tchekhovskoi, Damo Zhu, Vladimir G. Zaikin
The goal of quality control procedures is to produce the best possible spectra for library searching. The role of a panel of data evaluators is presented, and the plans for further improvements of the NIST/EPA/NIH mass spectral library is presented.

Software Testing: Protocol Comparison

May 29, 1998
Author(s)
James H. Yen, D L. Banks, Leonard J. Gallagher, Paul E. Black, Robert C. Hagwood, Raghu N. Kacker, Lynne S. Rosenthal
Software testing is hard, expensive, and uncertain. Many protocols have been suggested, especially in the area of conformance verification. In order to compare the efficacy of these protocols, we have implemented a designed simulation experiment that
Displaying 52251 - 52275 of 74036
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