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Displaying 49101 - 49125 of 74178

Experiments in Dilute Atomic Bose-Einstein Condensation

November 1, 1999
Author(s)
Eric A. Cornell, J R. Ensher, C E. Wieman
Why BEC? - In the month we began writing this paper, fourteen papers on the explicit topic of Bose-Einstein condensation (BEC) in a dilute gas appeared in the pages of Physical Review. Both theoretical and experimental activity in BEC has expanded

Extracting Thermochemical Information From Ab Initio Data

November 1, 1999
Author(s)
Karl K. Irikura
These are two lectures delivered at the NATO ASI on Energetics of Stable Molecules and Reactive Intermediates, Castelo Branco, Portugal, July 1998. They have been lightly edited and converted to HTML for electronic publication. Text for review is at the

Filler-Induced Composition Waves in Phase-Separating Polymer Blends

November 1, 1999
Author(s)
B P. Lee, Jack F. Douglas, S C. Glotzer
The influence of a dilute concentration of filler particles on polymer blend phase separation is investigated computationally using a generalization of the Cahn-Hilliard-Cook (CHC) theory to include model filler particles (spheres, fibers, platelets)

Grating Pitch Measurements With the Molecular Measuring Machine

November 1, 1999
Author(s)
John A. Kramar, Jay S. Jun, William B. Penzes, Fredric Scire, E C. Teague, John S. Villarrubia
At the National Institute of Standards and Technology, we are building a metrology instrument called the Molecular Measuring Machine (M^3) with the goal of performing nanometer- accuracy two-dimensional feature placement measurements over a 50 mm by 50 mm

Guidelines for Testing Passive Energy Dissipation Devices

November 1, 1999
Author(s)
Michael A. Riley, Fahim H. Sadek, B Mohraz
Passive energy dissipation devices can be used to significantly reduce the response of structures to earthquake and wind excitation. Wide acceptance of these devices depends on the availability of information on their performance as well as standards for

Heat Flux Transducer Calibration: Summary of the 2nd Workshop

November 1, 1999
Author(s)
William L. Grosshandler
The second workshop on heat flux gauge calibration was organized to share the results of an effort to expand competence at NIST, and to examine the recommendations made at a previous workshop on heat flux gauge calibration. Over 40 attendees were drawn

High-Temperature Properties of Liquid-Phase-Sintered A-Sic

November 1, 1999
Author(s)
R P. Jensen, William E. Luecke, N P. Padture, Sheldon M. Wiederhorn
We have characterized the high-temperature subcritical crack growth and oxidation resistance of a liquid-phase-sintered (LPS) SiC with 20% volume fraction yttrium aluminum garnet (YAG) second phase. Constant stress rate testing in air in the temperature

IGBT Model Validation for Soft-Switching Applications

November 1, 1999
Author(s)
David W. Berning, Allen R. Hefner Jr.
Techniques are described for validating the performance of Insulated-Gate Bipolar Transistor (IGBT) circuit simulator models for soft-switching circuit conditions. The circuits used for the validation include a soft-switched boost converter similar to that

Ionizing Radiation Induced Degradation of a Tetrachlorobiphenyl in Transformer Oil

November 1, 1999
Author(s)
M Chaychian, Joseph Silverman, M I. Al-Sheikhly, Dianne L. Poster, Pedatsur Neta
Complete degradation of 2,2',6,6'-tetrachlorobiphenyl (PCB 54) in transformer oil is achieved by ionizing radiation without degradation of the oil. Gamma irradiation of transformer oil containing PCB 54 (0.27 mg/g) with a dose of 200 kGy results in

Linear Dipole Response in a Reverberation Chamber

November 1, 1999
Author(s)
David A. Hill
A new spatial correlation function is derived for the axial electric field and is compared with the previously known spatial correlation function for the total electric field. The new correlation function is used to determine the average power received by

Long Polymerase Chain Reaction (PCR) for Variable Number of Tandem Repeats (VNTR) Analysis

November 1, 1999
Author(s)
Kristy L. Richie, M D. Goldsborough, M M. Darfler, E A. Benzinger, M L. Lovekamp, D J. Reeder, C D. O'Connell
The Polymerase Chain Reaction (PCR) has revolutionized the analysis of DNA from a variety of sources. With its sensitivity and ability to amplify degraded DNAs and small quantities of samples, coupled with fast turn-around-time, PCR is often the analytical

Measuring the Interface Stress: Silver/Nickel Interfaces

November 1, 1999
Author(s)
Daniel Josell, John E. Bonevich, I Shao, R C. Cammarata
Interface stress is a surface thermodynamics quantity associated with the reversible work of elastically straining an internal solid interface. In a multilayered thin film, the combined effect of the interface stress of each interface results in an in
Displaying 49101 - 49125 of 74178