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Displaying 50526 - 50550 of 73994

Estimating the Virial Coefficients of the Ammonia + Water Mixture

March 1, 1999
Author(s)
L A. Weber
A corresponding states type model has been used to estimate the second and third virial coefficients of the NH 3 + H 2O mixture. Additional mixing parameters were added to the formulations for both coefficients to account for the chemical interactions

External Radiative Quantum Efficiency of 96 % from a GaAs/GaInP Heterostructure

March 1, 1999
Author(s)
H G. Gauck, T H. Gforerer, M J. Renn, Eric A. Cornell, Kristine A. Bertness
GaAs/GaInP double heterostructures are index matched with ZnSe hemispheres to increase the coupling of photoluminescence out of the device. We measure external quantum efficiencies as large as 96 % using a bolometric calibration technique. When the

Four-Wave Mixing With Matter Waves

March 1, 1999
Author(s)
Lu Deng, Edward W. Hagley, J Wen, M Trippenbach, Y B. Band, Paul S. Julienne, J E. Simsarian, Kristian Helmerson, S L. Rolston, William D. Phillips
The advent of the laser as an intense, coherent light source gave birth to nonlinear optics, which now plays an important role in many areas of science and technology. One of the first applications of nonlinear optics was the production of coherent light

Measurement and Standards for Computational Science and Engineering

March 1, 1999
Author(s)
Ronald F. Boisvert, J L. Blue, Daniel W. Lozier, William F. Mitchell, Roldan Pozo, Michael J. Donahue, Donald G. Porter
This report describes current work within ITL on the development of measurement and standards technology to improve the practice of computational science and engineering.

Microstructural Changes in YSZ Deposits During Annealing

March 1, 1999
Author(s)
Andrew J. Allen, J Ilavsky, Gabrielle G. Long, Jay S. Wallace, C C. Berndt, H Herman
Various methods have been applied to the microstructural characterization of thermally-sprayed depostis. However, coexisting anisotropic distributions of intra-splat cracks and interlamellar pores, and the broad size range of rounded globular pores, have

Minimizing Feature Width in Atom-Optically Fabricated Chromium Nanostructures

March 1, 1999
Author(s)
W Anderson, C Bradley, Jabez J. McClelland, Robert Celotta
We present a study of factors that influence the feature width of nanostructures formed by atom-optical direct-write lithography. In this process, chromium atoms travel through a standing-wave laser light field and are deposited on a surface. Due to the

Molecularly Dispersed Dendrimers in a Polymeric Matrix

March 1, 1999
Author(s)
Barry J. Bauer, T J. Prosa, D W. Liu, C L. Jackson, D A. Tomalia, Eric J. Amis
Interpenetrating polymer networks are formed by dissolving poly(amidoamine) dendrimers in 2-hydroxyethyl methacrylate and polymerizing with dendrimer contents between 1 and 25 mass % containing dendrimers from generation 6 through 11. Small angle x-ray

Myths About Building Envelopes

March 1, 1999
Author(s)
Andrew K. Persily
It is often assumed that commercial and institutional buildings are fairly airtight and that envelopee air leakage does not have a significant impact on energy consumption and indoor air quality in these buildings. Furthermore, it is assumed that more

Optical Linewidth Models - Then and Now

March 1, 1999
Author(s)
Robert D. Larrabee, Richard M. Silver, M P. Davidson
In the late 1970's Dr. Diana Nyyssonen demonstrated that the National Institute of Standards and Technology (NIST) could optically calibrate photomask linewidth standards that were narrower than the classical resolution limit of a conventional bright-field
Displaying 50526 - 50550 of 73994
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