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Displaying 45726 - 45750 of 73697

Reference Materials for DNA Analysis

March 1, 2001
Author(s)
Barbara C. Levin, D J. Reeder
Mention has already been made, in Section 5.1. Of the use of DNA-based techniques for control of microbiological DNA. In parallel to the work of ATCC the USA National Institute of Standards and Technology (NIST) developed three Standard Reference Materials

Second Harmonic Magneto-Resistive Imaging to Authenticate and Recover Data From Magnetic Storage Media

March 1, 2001
Author(s)
David P. Pappas, C S. Arnold, G Shalev, C Eunice, D Stevenson, Steven Voran, Mike E. Read, Erin M. Gormley, James Cash, Ken Marr, James Ryan
A scanning magneto-resistive microscope was developed that allows for high resolution imaging of magnetic tapes and digital media. By using second harmonic detection to remove thermal anomalies we are able to image sufficient lengths of tape for

Shape-Sensitive Linewidth Measurement with the SEM Using a Model-Based Library

March 1, 2001
Author(s)
John S. Villarrubia, Andras Vladar, J R. Lowney, Michael T. Postek
In semiconductor electronics manufacturing, device performance often depends upon size. For example, microprocessor speed is linked to the width of transistor gates. Accurate measurement of feature width is an important but challenging problem. When a

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

March 1, 2001
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

Slab Effects in SMRF Retrofit Connection Tests

March 1, 2001
Author(s)
S A. Civjan, M D. Engelhardt, John L. Gross
A series of six full-scale subassemblages were tested to investigate dogbone and haunch retrofits for pre-Northridge steel moment connections. Tests included matched pairs of specimens, one bare steel and one including composite slab. Data were collected

Spectrum and Energy Levels of Singly-Ionized Mercury (Hg II)

March 1, 2001
Author(s)
Craig J. Sansonetti, Joseph Reader
The spectrum of singly-ionized mercury (Hg II) has been observed from 500 to 9880 with sliding sparks and pulsed-RF discharges on 10.7-m grating spectrographs in vacuum and air. About 500 lines have been classified as transitions between 114 energy levels

SQUID Operational Amplifier

March 1, 2001
Author(s)
Kent D. Irwin, Martin Huber
The nonlinear response of Superconducting Quantum Interface Devices (SQUIDs) has limited their usefulness. We propose the SQUID Operational Amplifier, which consists of several stages of SQUIDs with high open-loop current gain. When connected in a negative

State-of-the-Art Research Is the Future of Fire Investigation

March 1, 2001
Author(s)
Daniel M. Madrzykowski
Researchers at the National Institute of Standards and Technology's Building and Fire Research Laboratory are working with the U.S. Fire Administration; the bureau of Alcohol, Tobacco, and Firearms; and the U.S. Department of Justice to provide a more

Studying the Buried Interfacial Region With an Immobilized Fluorescence Probe

March 1, 2001
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. VanZanten, Joy Dunkers, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The properties of a buried epoxy / glass interfacial region were studied by covalently grafting a fluorescent probe to the glass surface. A dimethyl-amino-nitrostilbene (DMANS) fluorophore was tetherred to a triethoxy silane-coupling agent, generating a

Sub-Picowatt Precision Radiometry Using Superconducting Transition Edge Sensor Bolometers

March 1, 2001
Author(s)
James A. Chervenak, Erich N. Grossman, Carl D. Reintsema, Kent D. Irwin, S. H. Mosely, C. A. Allen
We describe a cryogenic radiometric calibration system suitable for high sensitivity, low power bolometers. The system uses a variable temperature blackbody source capable of temperatures of 4-20 K, whose output covers the sub-millimeter wavelength regime

Suppression of Flux Jumps in Marginally Stable Niobium-Tin Superconductors

March 1, 2001
Author(s)
Ronald B. Goldfarb, Loren F. Goodrich, T Pyon, E. A. Gregory
Niobium-tin superconductor wires with coalesced filaments may have reduced adiabatic stability. Magnetization measurements on such marginally stable conductors exhibit flux jumps, which appear as a sudden decrease in magnetization as the applied field is

Suppression of Lateral Phase Separation in Thin Polyolefin Blend Films

March 1, 2001
Author(s)
Y A. Akpalu, Alamgir Karim, Sushil K. Satija, N P. Balsara
The effectiveness of a compatibilizer in suppressing lateral phase separation in thin polyolefin blend films is investigated as a function offilm thickness and temperature. Neutron and x-ray reflectivity measurements were made on spun cast thin blend films

The Development of Fluorescence Intensity Standards

March 1, 2001
Author(s)
Adolfas K. Gaigalas, L. Li, O. Henderson, R F. Vogt, J. Barr, G E. Marti, J. Weaver, A. Schwartz
The use of fluorescence as an analytical technique has been growing over the last 20 years. A major factor in inhibiting more rapid growth has been the inability to make comparable fluorescence intensity measurements across laboratories. NIST recognizes

The Importance of Focused Evaluations: A Case Study of TREC and DUC

March 1, 2001
Author(s)
Donna K. Harman
Evaluation has always been an important part of scientific research, and in information retrieval, this evaluation has mostly been done using test collections. In 1992, a new test collection was built at the National Institute of Standards and Technology

The Infrared Spectra of the NH 3 -d n + Cations Trapped in Solid Neon

March 1, 2001
Author(s)
Warren E. Thompson, Marilyn E. Jacox
When a dilute mixture of NH 3 in neon is subjected to Penning ionization and/or photoionization by neon atoms in their first excited states, between 16.6 eV and 16.85 eV, and the products are rapidly frozen at approximately 5 K, the infrared spectrum of

The Interoperable Message Passing Interface (IMPI) Extensions to LAM/MPI

March 1, 2001
Author(s)
J M. Squyers, A Lumsdaine, William L. George, John G. Hagedorn, J E. Devaney
Interoperable Message Passing Interface (IMPI) is a protocol specification to allow multiple MPI implementations to cooperate on a single MPI job. Unlike portable MPI implementations, an IMPI-connected parallel job allows the use of vendor-tuned message
Displaying 45726 - 45750 of 73697
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