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Displaying 16151 - 16175 of 74049

Data Acquisition and Analysis Software for Gamma Coincidence Spectrometry

July 1, 2016
Author(s)
Martin Girchis Shetty, Dagistan Sahin
Coincidence counting in neutron activation analysis has well-known advantages, such as enhancement of signal and reduction in background. One obstacle to the wider use of this technique is the complexity of the data acquisition and reduction systems that

Dimensional Measurement Uncertainty from Data. Part 2: Uncertainty R&R

July 1, 2016
Author(s)
Theodore D. Doiron
While check standards will eventually give the most accurate uncertainty for a calibration procedure, the time and expense can be discouraging. Another common method, standard Gage Repeatability and Reproducibility study does not produce anything like the

Direct time-domain observation of attosecond final-state lifetimes in photoemission from solids

July 1, 2016
Author(s)
Zhensheng Tao, Cong Chen, Tibor Szilvasi, Mark W. Keller, Manos Mavrikakis, Henry C. Kapteyn, Margaret M. Murnane
Attosecond spectroscopic techniques have made it possible to measure differences in transport times for photoelectrons from localized core levels and delocalized valence bands in solids. We report the application of attosecond pulse trains to directly and

Electron Enhanced Growth of Crystalline Gallium Nitride Thin Films at Room Temperature and 100 C Using Sequential Surface Reactions

July 1, 2016
Author(s)
Alexana Roshko, Jaclyn Sprenger, Andrew S. Cavanagh, Steven George, Huaxing Sun, Kathryn J. Wahl
Low energy electrons may provide mechanisms to enhance thin film growth at low temperatures. In this work, gallium nitride (GaN) films were deposited over areas of ~5 cm2 at room temperature and 100 C using electrons with a low energy of 50 eV from an

Enabling Interactive Measurements from Large Coverage Microscopy

July 1, 2016
Author(s)
Peter Bajcsy, Antoine Vandecreme, Julien M. Amelot, Mary C. Brady, Joe Chalfoun, Michael P. Majurski
Microscopy could be an important tool for characterizing stem cell products if quantitative measurements could be collected over multiple spatial and temporal scales. With the cells changing states over time and being several orders of magnitude smaller

High-Pressure Synthesis of Manganese Oxyhydride with Partial Anion Order

July 1, 2016
Author(s)
Cedric Tassel, Yoshinori Goto, Daichi Watabe, Ya Tang, Honcheng Lu, Yoshinori Kuno, Fumitaka Takeiri, Takafumi Yamamoto, Craig Brown, James Hester, Yoji Kobayashi, Hiroshi Kageyama
We report the high-pressure synthesis of a manganese oxyhydride LaSrMnO 3.3H 0.7. Neutron and X-ray Rietveld analyses showed this compound adopts the K 2NiF 4 structure, with H -positioned exclusively at the equatorial site. This result makes a striking

Nanostructured Surface Phonon Polariton Systems for Mid-Infrared Nanophotonics

July 1, 2016
Author(s)
Alexander Giles, Richard Kasica, Joshua Caldwell
In this article, novel, phonon-based silicon carbide nanopillar antenna arrays are described. Using fabricated SiC structures, sub-diffractional, localized resonances are observed with exceptionally high quality factors (40-305) and corresponding high

Operation Tomodachi -Fire Research Special Issue

July 1, 2016
Author(s)
Samuel L. Manzello, Sayaka Suzuki
NIST’s Engineering Laboratory (EL-NIST) hosted “Operation Tomodachi – Fire Research” on March 16-18, 2015 in Gaithersburg, MD USA. Tomodachi means friendship in Japanese. This workshop was organized by Dr. Samuel L. Manzello of EL-NIST in partnership with

Perfluorinated Alkyl Acids in the Plasma of South African Crocodiles (Crocodylus niloticus)

July 1, 2016
Author(s)
Jessica L. Reiner, John Bowden, Ian Christie, Matthew P. Guillette, Theresa M. Cantu, Russell H. Lowers, Hannes Botha, Wilmien Luus-Powell, Willem J. Smit, Danny Govender, Danie Pienaar, Louis J. Guillette Jr.
Perfluorinated alkyl acids (PFAAs) are environmental contaminants that have been used in many products for over 50 years. Interest and concern has grown since 2000 on the widespread presence of PFAAs, when it was discovered that PFAAs were present in

Recent Activities of the National Commission on Forensic Science

July 1, 2016
Author(s)
John Butler
In February 2013, the U.S. Department of Justice (DOJ) and the National Institute of Standards and Technology (NIST) announced a partnership that included formation of the National Commission on Forensic Science (NCFS) and what is now the Organization of
Displaying 16151 - 16175 of 74049
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