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Displaying 49076 - 49100 of 74220

Ultrasonic Nonlinearity Parameter in Precipitate-Hardened Steels

December 1, 1999
Author(s)
Donna C. Hurley, Davor Balzar, P T. Purtscher
We have experimentally investigated a series of steel specimens containing copper-rich precipitates. The precipitate microstructure depended on the final aging treatment (time and temperature), which in turn affected the specimen hardness. We performed

Report on the NIST Java TM AES Candidate Algorithm Analysis

November 25, 1999
Author(s)
James F. Dray Jr.
NIST solicited candidate algorithms for the Advanced Encryption Standard in a Federal Register Announcement dated September 12, 1997. Fifteen candidates were submitted, and NIST has subsequently worked with a worldwide community of cryptanalysts and

Scalar Dissipation in Axisymmetric Jets

November 21, 1999
Author(s)
William M. Pitts
Scalar dissipation, defined as twice the product of the molecular diffusion coefficient and the local gradient of the mixture fraction taken as a dot product with itself, characterizes molecular mixing rates in turbulent flows and has a central role in

Two-Dimensional Index Profiling of Fibers and Waveguides

November 20, 1999
Author(s)
N. H. Fontaine, M. Young
We have constructued a two-dimensional refracted-ray scanner that can resolve index-of-refraction increments of approximately 4 x 10 -5. this resolution is an order of magnitude finer than the uncertainty of the measurement. The scanner can be adapted to

Microhotplate Gas Sensor Arrays

November 18, 1999
Author(s)
Richard E. Cavicchi, Stephen Semancik, R M. Walton, B Panchapakesan, Don L. DeVoe, M I. Aquino-Class, J D. Allen, John S. Suehle
In this work, micromachining and planar processing has been used to achieve solid state sensing devices with lower power consumption at lower cost. The small size brings new advantages for chemical selectivity as well: multi-element whose time-varying
Displaying 49076 - 49100 of 74220