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Chemistry

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Displaying 826 - 850 of 1924

Thermal Decomposition Kinetics of the Aviation Turbine Fuel Jet-A

July 2, 2008
Author(s)
Jason A. Widegren, Thomas J. Bruno
As part of a larger-scale thermophysical and transport property measurement project, the global decomposition kinetics of the aviation turbine fuel Jet-A was investigated. Decomposition reactions were performed at 375, 400, 425, and 450 °C in stainless

An international comparability study to determine the sources of uncertainty associated with a non-competitive sandwich fluorescent ELISA

July 1, 2008
Author(s)
James E. Noble, Lili Wang, Eleonora Cerasoli, Alex E. Knight, Robert A. Porter, Elaine Gray, Chris Howe, Elisabeth Hannes, Philippe Corbisier, Jing Wang, Liqing Wu, Ilaria Altieri, Marina Patriarca, Angelika Hoffman, Ute Resch-Genger, Bernd Ebert, Jan Voigt, Yasushi Shigeri, Maxim S. Vonsky, L A. Konopelko, Adolfas K. Gaigalas, Bailey J. Marc

Consideration and Influence of Complexed forms of Mercury Species on the reactivity Patterns Determined by Speciated Isotope Dilution Model Approaches: A Case for Natural Biological Reference Materials

June 1, 2008
Author(s)
David Point, J. I. Garcia Alonso, William C. Davis, Steven J. Christopher, Aurore Guichard, O.F. X. Donard, Paul R. Becker, Gregory C. Turk, Stephen A. Wise
The origins and the processes driving the inadvertent transformations of inorganic mercury (iHg) and methylmercury (MeHg) in cryogenically stored and homogenized fresh-frozen versus freeze-dried biological Standard Reference Materials (SRM) were

Shear Thinning Near the Critical Point of Xenon

April 17, 2008
Author(s)
Robert F. Berg, Michael R. Moldover, M Yao, G A. Zimmerli
We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < γτ < 700, where γτ is the shear rate scaled by the relaxation time τ of

Advancement of Light-Element Neutron Depth Profiling at the University of Texas

April 1, 2008
Author(s)
S M. Whitney, Robert Gregory Downing, S Biegalski, D S. O'Kelly
The University of Texas (UT) at Austin has collaborated with the National Institute of Standards and Technology for comparisons of concentration versus depth profiles of samples containing 10B. Technology sharing from NIST has allowed UT to avoid many

NIST Program to Support Testing and Evaluation of Trace Explosive Detection

October 1, 2007
Author(s)
R M. Verkouteren, John G. Gillen, Jennifer R. Verkouteren, Robert A. Fletcher, Eric S. Windsor, Wayne Smith
Trace detection is a primary strategy for thwarting terrorism activities in the US and abroad. The development of effective reference materials and methods for this purpose relies on fundamental knowledge regarding the size, mass, morphologies, and

Raman Spectroscopy of n-Type and p-Type GaSb with Multiple Excitation Wavelengths

October 1, 2007
Author(s)
James E. Maslar, Wilbur S. Hurst, C Wang
The interpretation of Raman spectra of GaSb can be complicated by the presence of a so-called surface space-charge region (SSCR), resulting in an inhomogeneous near-surface Raman scattering environment. To fully interpret Raman spectra, it is important to

Coupling Nanowire Chemiresistors With Microhotplate Platforms for Advanced Gas Sensing

August 6, 2007
Author(s)
Douglas C. Meier, Stephen Semancik, Bradley Button, Eugene Strelcov, Andrei Kilmakov
Recent advances in nanotechnology have yielded new materials and structures that offer great potential for improving sensitivity, selectivity and stability of the next generation of chemical gas sensors. To successfully fabricate practical devices, the

Reference Viscosities of H 2 , CH 4 , Ar and Xe at Low Densities

August 1, 2007
Author(s)
E May, Robert F. Berg, Michael R. Moldover
We determined the zero-density viscosity eta of hydrogen, methane and argon in the temperature range 200 K to 400 K, with standard uncertainties of 0.084 % for hydrogen and argon and 0.096 % for methane. These uncertainties are dominated by the uncertainty

Concordance Study Between the AmpFlSTR((R)) MiniFiler(TM) PCR Amplification Kit and Conventional STR Typing Kits

July 25, 2007
Author(s)
Carolyn R. Steffen, Margaret C. Kline, Julio J. Mulero, Robert E. Lagace, Chien-Wei Chang, Lori K. Hennessy, John M. Butler
The AmpFlSTR MiniFiler PCR Amplification kit developed by Applied Biosystems enables size reduction on eight of the larger short tandem repeat (STR) loci amplified in the Identifiler kit, which will aid recovery of information from highly degraded DNA

ILThermo: A Free-Access Web Database for Thermodynamic Properties of Ionic Liquids

July 15, 2007
Author(s)
Qian Dong, Chris D. Muzny, Andrei F. Kazakov, Vladimir Diky, Joe W. Magee, Jason A. Widegren, Robert D. Chirico, Kenneth N. Marsh, Michael D. Frenkel
The development, scope, and functionality of the web-based ionic liquids database, ILThermo, are described. The database is available free to the public, and aims to provide users worldwide with up-to-date information from publications of experimental

The Polarizability of Helium and Gas Metrology

June 22, 2007
Author(s)
James W. Schmidt, R Gavioso, E May, Michael R. Moldover
Using a quasi-spherical, microwave cavity resonator, we measured the refractive index of helium to deduce its molar polarizability A ε in the limit of zero density. We obtained (A ε,meas - A ε,theory)/A ε = (-1.8plus or minus} 8.4)× 10 -6, where the
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