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Displaying 47251 - 47275 of 74142

Multiplexed Readout of Superconducting Bolometers

December 31, 2000
Author(s)
D. J. Benford, C. A. Allen, James A. Chervenak, M. M. Freund, A. S. Kutyrev, S. H. Mosely, Rick A. Shafer, Johannes G. Staguhn, Erich N. Grossman, Gene C. Hilton, Kent D. Irwin, John M. Martinis, Sae Woo Nam, Carl D. Reintsema
Studies of astrophysical emission in the far-infrared and submillimeter require large arrays of detectors containing from hundreds to thousands of elements. A multiplexed readout is necessary for practical implementation of such arrays, and can be

New SWEAT Method for Fast, Accurate, and Stable Electromigration Testing on Wafer Level

December 31, 2000
Author(s)
Jochen von Hagen, G. Antonin, J. Fazekas, Linda M. Head, Harry A. Schafft
The Standard Wafer Level Electromigration Accelerated Test (SWEAT) is one of a few highly accelerated stress tests of metal line test structures that are used to monitor electromigration resistance. Earlier works and our own examinations have shown that

Performance of Multiplexed SQUID Readout for Cryogenic Sensor Arrays

December 31, 2000
Author(s)
James A. Chervenak, Erich N. Grossman, Kent D. Irwin, John M. Martinis, Carl D. Reintsema, C. A. Allen, David I. Bergman, S. H. Mosely, Rick A. Shafer
We report on the implementation of a multiplexer that users superconducting quantum interference devices (SQUIDs) to read out low-impedance cryogenic detectors. Using prototype chips, a circuit was built which interfaces eight input SQUID channels with a

SiC Power Diodes Provide Breakthrough Performance for a Wide Range of Applications

December 31, 2000
Author(s)
Allen R. Hefner Jr., Ranbir Singh, Jih-Sheng Lai, David W. Berning, Sebastien Bouche, Christophe C. Chapuy
The electrical performance of Silicon Carbide (SiC) diodes are evaluated and compared to commercially available Silicon (Si) diodes in the voltage range from 600 V through 5000 V. The comparisons include the on-state characteristics, the reverse recovery

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
Displaying 47251 - 47275 of 74142
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