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Search Publications

NIST Authors in Bold

Displaying 851 - 875 of 1184

On the Fracture Behavior of Nano-Layered Coatings Under Tension.

October 29, 2010
Author(s)
Daniel Josell, Herzl Chai
In this work the fracture behavior of a model brittle/ductile (Si/Ag) multilayer evaporated on a thick substrate is studied with the aid of a four-point bending apparatus. The system variables include individual layer thickness (2.5 to 30 nm), total film

Novel CaF2 Nanocomposite with High Strength and F Ion Release

May 3, 2010
Author(s)
Hockin D. Xu, Jennifer L. Moreau, Limin Sun, Laurence Chow
Secondary caries and restoration fracture remain the two most common problems. The objectives of this study were to develop stress-bearing, fluoride-releasing nanocomposites. Novel CaF2 nanoparticles (56-nm) were synthesized via spray-drying and

Letter to the Editor Creep of Consolidated Silver

October 16, 2008
Author(s)
H J. Mueller, F Eichmiller
This letter to the editor is in regard to a recent publication (Indentation Creep Behavior of a Direct-filling Alternative to Amalgam by H.H.K. Xu, H. Liao, and F.C. Eichmiller, J. Dent. Res. 77:1991, 1998), whereby the authors overlooked the citation of a

Standards for Monitoring the Temperature of Earth From Space

October 16, 2008
Author(s)
Joseph P. Rice
The National Aeronautical and Spece Administration (NASA), the National Oceanic and Atmospheric Administration (NOAA), the Department of Defense (DOD), the Department of Energy (DOE), and other Government agencies have projects in which space-flight

Calculated Performance of Low-Porosity Regenerators at 4 K with He-4 and He-3

June 9, 2008
Author(s)
Ray Radebaugh, Yonghua Huang, Agnes A. O'Gallagher, John M. Gary
Previously we have shown that the lower volumetric heat capacity and more ideal behavior of helium-3 compared with helium-4 at 4 K results in an improved performance for packed sphere regenerators operating with helium-3 between 4 K and about 20 K. In this

Role of Indenter Material and Size in Veneer Failure of Brittle Layer Structures

October 24, 2006
Author(s)
Sanjit Bhowmick, Juan J. Melendez-Martinez, Ilja Hermann, Yu Zhang, Brian R. Lawn
The roles of indenter material and size in the failure of brittle veneer layers in all-ceramic crown-like structures are studied. Glass veneer layers 1 mm thick bonded to alumina layers 0.5 mm thick on polycarbonate bases (representative of porcelain

Development and Calibration of Pyroelectric Radiometer Standards at NIST

April 21, 2006
Author(s)
George P. Eppeldauer, Jinan Zeng, Leonard M. Hanssen
The reference spectral power responsivity scale of NIST is being extended from the silicon range to the infrared (IR) using pyroelectric radiometers. Two transfer standard pyroelectric radiometers have been developed at NIST. The main design consideration

Storage Conditions for High-Accuracy Composition Standards of AlGaAs

May 1, 2005
Author(s)
Kristine A. Bertness, Alexana Roshko, S. E. Asher, Craig L. Perkins
AlGaAs epitaxial films were stored under different environmental conditions and the resulting surface oxidation and contamination variations measured using several analytical techniques. Auger depth profiles confirmed that oxidation and carbon

Dielectric Permittivity of Eight Gases Measured with Cross Capacitors

March 1, 2003
Author(s)
James W. Schmidt, Michael R. Moldover
… range from 0 C to 50 C and, in many cases, extend up to 7 MPa. The data for ε(p,T) may be useful for calibrating … was within the noise, expt{-epsilon} theory > = (-0.05 0.21) 10 -6 , demonstrating that the 4-ring cross …

Updated NIST Photomask Linewidth Standard

January 1, 2003
Author(s)
James E. Potzick, J Pedulla, Michael T. Stocker
NIST is preparing to issue the next generation in its line of binary photomask linewidth standards. Called SRM 2059, it was developed for calibrating microscopes used to measure linewidths on photomasks, and consists of antireflecting chrome line and space

Photoassociation in a Bose-Einstein Condensate

August 1, 2002
Author(s)
Paul D. Lett
Two colliding atoms can absorb a photon and be photoassociated into an excited, diatomic molecule, NIST researchers investigated the fundamental rate at which this process can take place in a Bose-Einstein condensate (BEC) and demonstrated that simple

Effect of a Low-Fluoride-Content, Two-Component Rinse on Fluoride Uptake and on De-and Remineralization of Enamel Lesions: An In Vitro Study

June 1, 2001
Author(s)
Shozo Takagi, H Liao, Laurence C. Chow
… this rinse produced an F deposition that was about 7 times greater than a conventional 13.2-mmol/I sodium … NaF rinse, and (4) the 3-mmol/I F two-component rinse in a 7-day in vitro pH cycling model. The changes in lesion … the 3-mmol/I F two-component rinse produced the same (p>0.05) protection against demineralization as did the …
Displaying 851 - 875 of 1184
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