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Displaying 49751 - 49775 of 73832

Three-Body Wear of a Hand-Consolidated Silver Alternative to Amalgam

September 1, 1999
Author(s)
Hockin D. Xu, F Eichmiller, Anthony A. Giuseppetti, L K. Ives, Edward E. Parry, Gary E. Schumacher
Recent studies have investigated a mercury-free silver alternative to amalgam, but the silver powders required a relatively high compaction pressure to consolidate. The aim of the present study was to consolidate a precipitated silver powder into a

Transient Target Patterns in Phase Separating Filled Polymer Blends

September 1, 1999
Author(s)
Alamgir Karim, Jack F. Douglas, G Nisato, D W. Liu, Eric J. Amis
Recent simulations have indicated that the presence of filler particles in a phase separating blend can induce the development of composition waves having the symmetry of the filler particles. We investigate these predictions through atomic force

Transmission Near-Field Scanning Microscope for Infrared Chemical Imaging

September 1, 1999
Author(s)
B Dragnea, J Preusser, W Schade, S R. Leone, W D. Hinsberg
We report transmission infrared near-field scanning microscopy (IR-NSOM) imaging of chemically amplified photoresist polymers patterned by ultraviolet exposure. Chemical specificity was attained using infrared wavelengths tuned to the 3 m OH stretch

Transport Properties and Durability of Concrete: Literature Review and Research Plan

September 1, 1999
Author(s)
Dale P. Bentz, J R. Clifton, Chiara F. Ferraris, Edward J. Garboczi, J M. Torrents
The increased emphasis on life cycle cost analysis for building projects requires that new attention be focused on the service life and durability of concrete structures. While concrete is typically specified based on compressive strength and slump, it is

Vortices in a Bose-Einstein Condensate

September 1, 1999
Author(s)
M R. Matthews, B P. Anderson, P C. Haljan, C E. Wieman, Eric A. Cornell
We have created vortices in two-component Bose-einstein condensates. The vortex state was created through a coherent process involving the spatial and temporal control of interconversion between the two components. Using an interference technique, we map

Biographical Memoirs Lyman James Briggs

August 31, 1999
Author(s)
P B. Myers, Johanna Levelt Sengers
This is a biographical memoir of Dr. Lyman Briggs written for the Proceedings of the National Academy of Sciences. Dr. Briggs began his career in 1896 as a soil physicist at the U.S. Department of Agriculture. He was transferred to NBS in 1917, where he

Magnetic Reversal of Ultra-Thin Films with Planar Magnetization

August 25, 1999
Author(s)
R Hyman, A Zangwill, Mark D. Stiles
Classical spin simulations are used to study magnetic reversal in ultra-thin (1-6 monolayers) films with planar magnetization and surface roughness typical of epitaxially grown samples. Reduced site symmetry at surface steps leads to strong, local

The Advanced Encryption Standard: A Status Report

August 25, 1999
Author(s)
Elizabeth B. Lennon
In 1997, the National Institute of Standards and Technology (NIST) initiated a process to select a symmetric-key encryption algorithm to be used to protect sensitive (unclassified) Federal Information, in furtherance of NIST's statutory responsibilities

Exchange Coupling in Magnetic Multilayers Grown on Iron Whiskers

August 20, 1999
Author(s)
John Unguris, Robert Celotta, D Tulchinsky, Daniel T. Pierce
Meaningful tests of theoretical predictions of magnetic multilayer properties require the fabrication of multilayers with nearly the same atomic scale precision as the theoretical models. Multilayers grown epitaxially on single crystal Fe whisker

Structural investigation of (Sr 4-d Ca d )PtO 6 Using X-Ray Rietveld Refinement

August 16, 1999
Author(s)
Winnie K. Wong-Ng, James A. Kaduk, R A. Young, F Jiang
The structures of the solid solution series (Sr 4-δCa δ)PtO 6, with δ = 0, 0.85(1), 2, and 3, have been investigated using the Rietveld refinement technique with laboratory x-ray powder data. A complete solid solution between Sr and Ca was confirmed to

Behavior of Bare and Aspirated Thermocouples in Compartment Fires.

August 15, 1999
Author(s)
L G. Blevins
As part of an effort to characterize the uncertainties associated with temperature measurements in fire environments, models of bare bead, single-shielded aspirated, and double-shielded aspirated thermocouples were developed and used to study the expected

The IUSR Project: Industry Usability Report

August 10, 1999
Author(s)
Jean C. Scholtz
The Industry Usability Report (IUSR) Project is designed to help potential corporate purchasers of software obtain information about the usability of supplier products. There are two parts to the IUSR project: a proposed format for sharing usability

Improved Accuracy Tristimulus Colorimeters Calibrated With Standard

August 6, 1999
Author(s)
George P. Eppeldauer
A new method has been developed to calibrate tristimulus colorimeters for high accuracy color measurements. Instead of traditional lamp standards, modern, high accuracy detector standards are suggested for calibration. After high accuracy absolute spectral
Displaying 49751 - 49775 of 73832
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