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Displaying 50226 - 50250 of 73697

Conformance Testing and Certification Model for Software Specifications

March 1, 1999
Author(s)
Lisa J. Carnahan, Lynne S. Rosenthal, Mark Skall
The use of conformity assessment as a means by which buyers and sellers can communicate requirements and conformance will increase as information technology systems and applications grow more complex. Models for conformance testing and certification

Curing of High-Performance Concrete: Report of the State-of-the-Art

March 1, 1999
Author(s)
K W. Meeks, Nicholas J. Carino
This report describes the latest information, technology, and research on the curing of high-performance concrete (HPC). The scope of the report is expanded somewhat to examine the current body of knowledge on the effects of various curing conditions on

Dielectric and Ultrasonic Anomalies at 16, 37, and 65 K in SrTiO 3

March 1, 1999
Author(s)
C Ang, J F. Scott, Z Yu, H M. Ledbetter, J L. Baptista
In this paper we report coincident anomalies in both dielectric response and sound velocities in strontium titanate around three temperatures 16.37 and 65 K. The anomalies occur in both single-crystal specimens and ceramics so they cannot be related to

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.
Displaying 50226 - 50250 of 73697
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