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NIST Authors in Bold

Displaying 46826 - 46850 of 73697

CollabLogger: A Tool for Visualizing Groups at Work

December 28, 2000
Author(s)
Emile L. Morse, Michelle P. Steves
The CollabLogger is a visual tool that has been developed to support usability analyses of human-computer interaction in a team environment. The participants in the computer-mediated activity were engaged in a small-scale manufacturing testbed project

Estimation of the Hydrophobic Effect in an Antigen-Antibody Protein-Protein Interface

December 19, 2000
Author(s)
E. J. Sundberg, M. Urrutia, B C. Braden, J. Isern, D. Tsuchiya, B. A. Fields, E Malchiodi, J. Tormo, Frederick P. Schwarz, R A. Mariuzza
Antigen-antibody complexes provide useful models for analyzing the thermodynamics of protein-protein association reactions. We have employed site-directed mutagenesis, X-ray crystallography, and isothermal titration calorimetry to investigate the role of

Gradient Search Method for Orbital-Dependent Density-Functional Calculations

December 15, 2000
Author(s)
R Hyman, Mark D. Stiles, A Zangwill
We describe a gradient search method appropriate for electronic structure problems where the energy functionals are explicitly orbital-dependent. The ground state is found by minimizing the total energy with respect to the scalar and vector potentials that

Noise-Induced Leakage and Counting Errors in the Electron Pump

December 15, 2000
Author(s)
Richard L. Kautz, Mark W. Keller, John M. Martinis
Computer simulations reveal that the lowest rates of leakage and counting errors observed in the electron pump can be explained by photon-assisted tunneling driven by 1/f noise. The noise power at microwave frequencies required to account for the observed

Molecular Dynamics Study of Liquids in Contact with Tethered Chains

December 13, 2000
Author(s)
Raymond D. Mountain
The results of a series of molecular dynamics simulationss of long chain molecules in contact with a surface, with water films, and with water-acetonitrile films are discussed. The number of chains per unit area is about 1/2 of the close packed density

The TREC-8 Question Answering Track Report

December 11, 2000
Author(s)
Ellen M. Voorhees
The TREC-8 Question Answering track was the first large-scale evaluationof domain-independent question answering systems.This paper summarizes the results of the track by giving a briefoverview of the different approaches taken to solve the problem.The

Head Tracking Using Stereo

December 6, 2000
Author(s)
D Russakoff, Martin Herman
Head tracking is an important primitive for smart environments and perceptual user interfaces where the poses and movements of body parts need to be determined. Most previous solutions to this problem are based on intensity images and, as a result, suffer

A Phase-Field Model With Convection: Numerical Simulations

December 1, 2000
Author(s)
D M. Anderson, Geoffrey B. McFadden, A A. Wheeler
In a previously developed phase-field model of solidification that includes convection in the melt, the two phases are represented as viscous liquids, where the putative solid phase has a viscosity much larger than the liquid phase. In this paper we report

A Specification-Based Coverage Metric to Evaluate Test Sets

December 1, 2000
Author(s)
P E. Ammann, Paul E. Black
Software developers use a variety of methods, including both formal methods and testing, to argue that their systems are suitable components for high assurance applications. In this paper, we develop another connection between formal methods and testing by

Agent-Based Services for B2B Electronic Commerce

December 1, 2000
Author(s)
Elizabeth N. Fong, Nenad Ivezic, Thomas R. Rhodes, Y Peng
The potential of agent-based systems has not been realized yet, in part, because of the lack of understanding of how the agent technology supports industrial needs and emerging standards. The area of business-to-business electronic commerce (b2b e-commerce

Alpha Case Thickness Modeling in Investment Castings

December 1, 2000
Author(s)
William J. Boettinger, Maureen E. Williams, Sam R. Coriell, Ursula R. Kattner, B A. Mueller
The alpha case thickness at the surface of a Ti-6Al-4V step wedge investment casting has been measured and successfully predicted. The prediction uses temperature-time results obtained from a heat flow simulation of the casting that was performed with a

Asymmetric coupled CMOS lines-an experimental study

December 1, 2000
Author(s)
Uwe Arz, Dylan F. Williams, Dave K. Walker, Hartmut Grabinski
Abstract: This paper investigates the properties of asymmetric coupled lines built in a 0.25- m CMOS technology over the frequency range of 50 MHz to 26.5 GHz. We show that the frequency-dependent line parameters extracted from calibrated four-port

Chlorination in Combustion Systems

December 1, 2000
Author(s)
Wing Tsang, Valeri I. Babushok
This paper is concerned with the formation of polychorinated organics in the gas phase in combustion systems. The results are derived from simulation studies with inputs from the fundamental kinetics of single step thermal gas phase reactions. Attention is
Displaying 46826 - 46850 of 73697
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