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Search Publications

NIST Authors in Bold

Displaying 226 - 250 of 287

A Novel Test Sample for the Quantification of Illicit Drugs in Fingerprints using Imaging Mass Spectrometry

April 27, 2015
Author(s)
Shinichiro Muramoto, Thomas Forbes, Arian C. van Asten, John Gillen
… (137.8 ± 15.8) ng/mm2 of cocaine, corresponding to roughly 7% of the total cocaine molecules being transferred in one … the substrate was changed to a cotton paper, only (19.3 ± 7.4) ng/mm2 of cocaine was detected, corresponding to just … of cocaine on paper was (270 ± 121) pg/mm2, or roughly 1.7% transfer. …

Optical Properties of CdSe/ZnS Nanocrystals

December 31, 2014
Author(s)
Paul C. DeRose, Yu-Zhong Zhang, Adolfas Gaigalas
Measurements are presented of the absorbance, fluorescence emission, fluorescence quantum yield, and fluorescence lifetime of CdSe/ZnS nanocrystals, also known as quantum dots (QDs). The study included three groups of nanocrystals whose surfaces were

Reactive MALDI Mass Spectrometry of Saturated Hydrocarbons: A Theoretical Study

May 1, 2010
Author(s)
William E. Wallace, Lewandowski Hans, Meier J. Robert
Recently it has been shown that the cobaltocenium cation, prepared by the laser ablation of a CoCp(CO)2/fullerene matrix, may react with alkanes and polyethylenes in the gas phase via a dehydrogenation reaction to produce [Co(Cp)2(alkadiene)]+ ions without

Comparisons by PTB, NIST, and LNE-LADG in Air and Natural Gas With Critical Venturi Nozzles Agree Within 0.05 %

May 16, 2006
Author(s)
B Mickan, Roland H. Kraemer, D Dopheide, Hans-Jurgen Hotze, Heino-Michael Hinze, Aaron Johnson, John D. Wright, J-P Vallet
The PTB, NIST, and LNE-LADG conducted a comparison of gas flow measurement standards in air and natural gas in the pressure range from 0.9 to 42 bar. The artifacts used in the intercomparisons were four critical venturis with ISO standard toroidal shape

Iron and Permalloy Based Magnetic Monolithic Tunable Microwave Devices

May 15, 2003
Author(s)
Bijoy Kuanr, Leszek Malkinski, Robert E. Camley, Zbigniew Celinski, Pavel Kabos
We constructed a series of Magnetic Monolithic tunable Microwave notch-filters and phase shifters in co-planer waveguide (CPW) geometry on GaAs substrates using Fe and Permalloy as magnetic materials. In contrast to previous work with Molecular Beam

Sorptivity-Based Service Life Predictions for Concrete Pavements

September 1, 2001
Author(s)
Dale P. Bentz, M A. Ehlen, Chiara F. Ferraris, Edward J. Garboczi
The degradation of concrete pavements is often controlled by the transport of a deleterious species (chloride or sulfate ions, or water in the case of freeze/thaw) into the concrete. With this in mind, a three-year research project, funded by the Federal

Evaluation of Exit Signs in Clear and Smoke Conditions (NISTIR 4399)

August 1, 1990
Author(s)
Belinda L. Collins, Daniel M. Madrzykowski
The present paper provides a short review of the research literature on the visibility of exit signs, directional markings, and emergency lighting. It also presents a study which assessed the visibility of several types of exit signs including conventional

Properties of Tornado Wind Speed Profiles Used in the Development of the ASCE 7-22 Tornado Provisions

October 22, 2024
Author(s)
Franklin Lombardo, Zachary Wienhoff, Maryam Refan, Joshua Wurman, Karen Kosiba, Marc Levitan
… tornado task committee (TTC) was convened through the ASCE 7 Wind Load Subcommittee, in part to report on the … for inclusion in the new tornado load chapter of the ASCE 7-22 standard. A total of 36 tornado profiles were evaluated … was then developed for ASCE 7-22. The proposed nominal tornado profile closely followed …

SAND: automated time-domain modeling of NMR spectra applied to metabolite quantification

January 25, 2024
Author(s)
Yue Wu, Omid Sanati, Mario Uchimiya, Krish Krisnamurthy, Jonathan Wedell, Jeffrey C. Hoch, Arthur S. Edison, Frank Delaglio
Developments in untargeted nuclear magnetic resonance (NMR) metabolomics enable the profiling of thousands of bio-logical samples. Exploitation of this rich source of information requires detailed quantification of spectral features. How-ever, the

Characterization of Die-Swell in Thermoplastic Material Extrusion

July 5, 2023
Author(s)
Austin Colon, David Kazmer, Amy Peterson, Jonathan Seppala
Die-swell is a flow effect that occurs in polymer extrusion whereby the material experiences rapid stress and dimensional changes upon exiting the nozzle orifice. Material extrusion additive manufacturing is no exception, and this effect influences the

Entering New Era of Thermoelectric Oxide Ceramics with High Power Factor through Designing Grain Boundaries

January 12, 2023
Author(s)
Cesar-Octavio Romo-De-La-Cruz, Yun Chen, Liang Liang, Sergio Paredes-Navia, Winnie Wong-Ng, Mark Williams, Xueyan Song
Thermoelectric (TE) oxide ceramics could play a significant role in waste heat recovery using TE generators, accelerating clean energy generation and achieving net-zero emissions. In 2003, the TE performance of single-crystal Ca3Co4O9+δ was evaluated with

Dual-microcavity narrow-linewidth Brillouin laser

March 5, 2015
Author(s)
William Loh, Adam A. Green, Frederick N. Baynes, Daniel C. Cole, Franklyn J. Quinlan, Hansuek Lee, Kerry J. Vahala, Scott A. Diddams
The tunable narrow-linewidth laser is a revolutionary metrology tool that is critical in precision spectroscopy and the determination of fundamental physical constants, displacement measurements at the 10 -20 level, and the development of the most advanced

A calorimetric and equilibrium investigation of the reaction {methyl ferulate(aq) + H2O(l) = methanol(aq) + ferulic acid(aq)}

January 3, 2011
Author(s)
Robert N. Goldberg, Michael J. Selig, Stephen R. Decker, Brian E. Lang
… Values of the apparent equilibrium constant K = 29.6  0.7 (temperature T = 298.15 K, citrate buffer at pH = 4.98, … to calculate the values K = (1.89  0.06)∙10-4, rH = (7.3  1.7) kJ∙mol-1, ΔrG = (21.25  0.07) kJ∙mol-1, and ΔrS = (46.8 …

Phase Compatibility of the Thermoelectric Compounds in the Sr-Ca-Co-O System

April 14, 2010
Author(s)
Winnie K. Wong-Ng, Guangyao Liu, Joshua B. Martin, Evan L. Thomas, Nathan Lowhorn, James A. Kaduk
Two low-dimensional cobaltite series in the Sr-Ca-Co-O system have been investigated for their solid solution limit, structure, and compatibility phase relationships (850 deg C in air). Thermoelectric properties have been measured for selected members of

Infrared emission imaging as a tool for characterization of hydrogen storage materials

December 6, 2008
Author(s)
H. Oguchi, Edwin J. Heilweil, Daniel Josell, Leonid A. Bendersky
Combinatorial thin films provide an opportunity for studying a variety of properties over a wide range of compositions and microstructures on a single substrate, allowing substantial acceleration of both the fabrication and study of materials and their
Displaying 226 - 250 of 287
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