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Displaying 34801 - 34825 of 73832

Consistency of D 13 C Measurements Improved

February 1, 2006
Author(s)
T B. Copelen, W Brand, M Gehre, M Groening, HAJ Meijer, Blaza Toman, R. Michael Verkouteren
We present state-of-the-art measurements and data evaluation methods to show that the consistency of carbon isotope ratio measurements can be improved 39 % to 47 % by anchoring the measurement scale with two isotopic reference materials differing in carbon

Determination of Polybrominated Diphenyl Ethers in Indoor Dust Standard Reference Materials

February 1, 2006
Author(s)
H M. Stapleton, T. Harner, M. Shoeib, Jennifer M. Lynch, Michele M. Schantz, Stefan D. Leigh, Stephen A. Wise
Polybrominated diphenyl ethers (PBDEs) have been measured for the first time in three different indoor dust Standard Reference Materials (SRMs) prepared by the National Institute of Standards and Technology (NIST). Two of these SRMs (2583 and 2584) have

Energy Levels of 4f3 in the Free Nd3+ Ion From Emission Spectra

February 1, 2006
Author(s)
J-F Wyart, Ali Meftah, Annik Bachelier, Jocelyne Sinzelle, Wan-U Lydia Tchang-Brillet, Norbert Champion, Nissan Spector, J Sugar
The emission spectrum of neodymium produced by vacuum spark sources was observed in the vacuum ultraviolet on two normal-incidence spectrographs. In an initial result, more than 550 lines have been identified as transitions from 85 4f25d levels to 37

Generating Thickness Gradients of Thin Polymer Films via Flow Coating

February 1, 2006
Author(s)
Christopher Stafford, Kristen Roskov, Thomas Epps, Michael J. Fasolka
Thickness is a governing factor in the behavior of films and coatings. To enable the high-throughputanalysis of this parameter in polymer systems, we detail the design and operation of a flow coater device for fabricating continuous libraries of polymer

MEMS Length and Strain Round Robin Results with Uncertainty Analysis

February 1, 2006
Author(s)
Janet M. Cassard, Robert I. Scace, Winthrop A. Baylies
A microelectromechanical systems (MEMS) Length and Strain Round Robin Experiment was completed in January 2005 to compare results of in-plane length measurements, residual strain measurements, and strain gradient measurements at a number of laboratories

Mirofluidic Appproach for Rapid Interfacial Tensiometry

February 1, 2006
Author(s)
J Cabral, Steven Hudson
We report a microfluidic instrument to rapidly measure the interfacial tension of multi-component immiscible liquids. The measurement principle rests upon the deformation and retraction dynamics of drops under extensional flow and was implemented in

Modeling the Influence of Limestone Filler on Cement Hydration in CEMHYD3D

February 1, 2006
Author(s)
Dale P. Bentz
The ASTM C150 standard specification for portland cement now permits the addition of up to 5 % limestone filler. While these and much higher levels of limestone filler substitution have been employed in Europe and elsewhere for many years, the change in

NIST Technical Publication

February 1, 2006
Author(s)
James R. Ehrstein, M C. Croarck, H Liu
This report documents the selection of material, the certification procedure and its control, and the analysis of measurement uncertainty for a family of improved Standard Reference Materials (SRMs) for sheet resistance and resistivity of silicon wafers

On the Absorption Spectrum of Noble Gases at the Arc Spectrum Limit

February 1, 2006
Author(s)
Ugo Fano, G Pupillo, A Zannoni, Charles W. Clark
Rydberg spectral lines of an atom are sometimes superimposed on the continuous spectrum of a different configuration. Effects of interaction among different configurations in one of these cases are theoretically investigated, and a formula is obtained that

Preparation of Reference Material 8504, Transformer Oil

February 1, 2006
Author(s)
Dianne L. Poster, Michele M. Schantz, Stephen A. Wise
A new reference material (RM), RM 8504, has been prepared for use as a diluent oil with Aroclors in transformer oil Standard Reference Materials (SRMs) 3075-3080 or SRM 3090 when developing and validating methods for the determination of polychlorinated
Displaying 34801 - 34825 of 73832
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