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Displaying 47276 - 47300 of 74160

Superconducting Transition-Edge-Microcalorimeter X-ray Spectrometer with 2 eV Energy Resolution at 1.5 keV

December 31, 2000
Author(s)
David A. Wollman, Sae Woo Nam, Dale Newbury, Gene C. Hilton, Kent D. Irwin, Norman F. Bergren, Steven Deiker, David A. Rudman, John M. Martinis
We describe the operation and performance of a prototype microcalorimeter ?energy-dispersive? (nondispersive) x-ray spectrometer (mcal EDS) developed at NIST for use in x-ray microanalysis and x-ray astronomy. The low-energy microcalorimeter detector

Temperature Dependence of Soft Breakdown and Wear-Out in Sub-3 nm SiO 2 Films

December 31, 2000
Author(s)
John S. Suehle, Eric M. Vogel, Bin Wang, J B. Bernstein
A comprehensive time-dependent dielectric breakdown study was conducted on sub-3 nm SiO 2 films over a temperature range from 22 0C to 350 0C. Two breakdown modes were observed in current versus time characteristics and low voltage I-V curves depending on

1,6-Hexanedithiol Monolayers on Au(111): A Multi-Technique Structural Study

December 29, 2000
Author(s)
T Leung, M Gerstenberg, D J. Lavrich, G Scoles, F Schreiber, G Poirier
Monolayers of 1,6-hexanedithiol [HS(CH 2) 6SH] deposited on Au(111) from the gas phase were characterized by scanning tunneling microscopy (STM), grazing incidence X-ray diffraction (GIXD), and low energy atom diffraction (LEAD). Molecular resolution STM

Report of the NIST MEL Architecture Task Force

December 29, 2000
Author(s)
Harry A. Scott, John Evans, Steven R. Ray, E C. Teague, James S. Albus, Herbert T. Bandy, Edward J. Barkmeyer Jr., Neil Christopher, M A. Donmez, Hui-Min Huang, Albert W. Jones, Elena R. Messina, Jim G. Nell, Frederick M. Proctor, Evan K. Wallace
The NIST Manufacturing Engineering Laboratory undertook a series of internal working meetings to examine all of its architecture efforts. A survey of work was performed, and recommendations were identified. This document, initially compiled in 1999

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
Displaying 47276 - 47300 of 74160
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