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Displaying 10926 - 10950 of 74219

NIST Micronutrients Measurement Quality Assurance Program Winter and Summer 2017 Comparability Studies: Results for Round Robins LXXXI and LXXXII Fat-Soluble Vitamins and Carotenoids in Human Serum

January 10, 2018
Author(s)
Jeanice M. Brown Thomas, David L. Duewer
The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fat-soluble vitamins and carotenoids in human serum and plasma. This report describes the design

Recommendation for the Entropy Sources Used for Random Bit Generation

January 10, 2018
Author(s)
Meltem Sonmez Turan, Elaine B. Barker, John M. Kelsey, Kerry A. McKay, Mary L. Baish, Mike Boyle
This Recommendation specifies the design principles and requirements for the entropy sources used by Random Bit Generators, and the tests for the validation of entropy sources. These entropy sources are intended to be combined with Deterministic Random Bit

A Review of Public Response to Short Message Alerts under Imminent Threat

January 9, 2018
Author(s)
Erica D. Kuligowski, Jessie Doermann
The National Institute of Standards and Technology (NIST)’s Technical Investigation of the 2011 Joplin, MO tornado identified that no widely accepted standards exist for emergency communications in tornado events and more specifically, policies involving

A Critical Appraisal of Community Resilience Studies: Progress and Challenges

January 8, 2018
Author(s)
Maria Koliou, John W. van de Lindt, Bruce Ellingwood, Maria Dillard, Harvey Cutler, Therese P. McAllister
Community resilience, which has been defined as the ability to prepare for and recover from disruptive hazard events, has been addressed across multiple disciplines including environmental sciences, engineering, sociology, psychology and economics

AC Signal Characterization for Optimization of a CMOS Single Electron Pump

January 8, 2018
Author(s)
Roy E. Murray, Justin K. Perron, Michael D. Stewart, Neil M. Zimmerman
Pumping single electrons at a set rate is being widely pursued as an electrical current standard. Much work has been done on pumping using a single AC signal, but using multiple coordinated AC signals may help lower error rates. Whether pumping with one or

Quantification of DNA/SWCNT Solvation Differences by Aqueous Two Phase Separation

January 8, 2018
Author(s)
Ming Zheng, Yoona Yang, Akshaya Shankar, Thibault Aryaksama, Anand Jagota
Single wall carbon nanotubes (SWCNTs) coated with single-stranded DNA can be effectively separated into various chiralities using an aqueous two phase (ATP) system. Partitioning is driven by small differences in the dissolution characteristics of the

Quantum for Pressure

January 5, 2018
Author(s)
Jay H. Hendricks, Patrick F. Egan, Jacob E. Ricker, Jack A. Stone Jr., Kevin O. Douglass, Gregory F. Strouse
A team of NIST scientists is working to fundamentally change the way that the unit of pressure is realized and disseminated, an effort that will lead to the elimination of mercury barometer pressure standards.

Bad security metrics: the problem and its solution

January 4, 2018
Author(s)
David W. Flater
It is generally acknowledged that few security metrics have the level of predictive validity that their uses require, but neither the nature of the problem nor the steps needed to avoid it have been fully characterized. This article examines both questions

Noncentrosymmetric Superconductor BeAu

January 4, 2018
Author(s)
A. Amon, E. Svanidze, R. Cardoso-Gil, M. N. Wilson, H. Rosner, M. Bobnar, W. Schnelle, Jeffrey W. Lynn, R. Gumeniuk, C. Hennig, G. M. Luke, H. Borrmann, A. Leithe-Jasper, Yu Grin
In noncentrosymmetric superconductors mixed spin-singlet and spin-triplet pairing can occur. In this work, physical properties of the noncentrosymmetric superconductor, BeAu, were investigated. It was established that BeAu undergoes a structural phase

Perovskite Nickelates as Electric-Field Sensors in Salt Water

January 4, 2018
Author(s)
Zhen Zhang, Derek Schwanz, Badri Narayanan, Michele Kotiuga, Joseph Dura, Mathew Cherukara, Hua Zhou, John W. Freeland, Jiarui Li, Ronny Sutarto, Feizhou He, Chongzhao Wu, Jiaxin Zhu, Yifei Sun, Koushik Ramadoss, Stephen S. Nonnenmann, Nanfang Yu, Riccardo Comin, Karin M. Rabe, Subramanian K.R.S. Sankaranarayanan, Shriram Ramanathan
Although oceans comprise over seventy percent of our planet, they are among the least understood ecosystems. Complex three-dimensional marine environments hold important clues into long term effects of climate change, evolutionary consequences, and animal

Self-assembled Layering of Magnetic Nanoparticles in a Ferrofluid onSilicon Surfaces

January 4, 2018
Author(s)
Katharina Theis-Brohl, Erika C. Vreeland, Andrew Gomez, Dale L. Huber, Apurve Saini, Max Wolff, Brian B. Maranville, Erik Brok, Kathryn L. Krycka, Joseph Dura, Julie Borchers
This article describes the 3D self-assembly of monodisperse colloidal magnetite nanoparticles from a dilute water-based ferrofluid onto a silicon surface and the dependence of the resultant magnetic structure with applied field. The nanoparticles assemble

On the Impacts of In-Band LTE Emissions

January 3, 2018
Author(s)
Azizollah Kord
Abstract—With the introduction of low-power internet of things (IoT) and device to device (D2D) communications in the long time evolution (LTE) system protocol, the in-band interference from other user equipment (UE) with higher power requires special

On the Susceptibility of Coded OFDM to Interference: A Simulation Study

January 3, 2018
Author(s)
Jason Coder, Yao Ma
The susceptibility of broadband wireless communications signals (e.g., LTE, IEEE 802.11) to interference has been a topic of significant research. In this paper, we implement a simulation-based study on the impact interference can have on the bit error

Relativistic all-order many-body calculation of energies, wavelengths, and M1 and E2 transition rates for the 3d^n configurations in tungsten ions

January 3, 2018
Author(s)
M S. Safronova, U I. Safronova, S. G. Porsev, M G. Kozlov, Yuri Ralchenko
Energy levels, wavelengths, magnetic-dipole and electric-quadrupole transition rates between the low-lying states are evaluated for W51+ to W54+ ions with 3dn (n = 2 to 5) electronic con gurations using an approach combining con guration interaction with

Validation of ATR FT-IR to identify polymers of plastic marine debris, including those ingested by marine organisms

January 3, 2018
Author(s)
Melissa R. Jung, F. D. Horgen, Sara Orski, Viviana Rodriguez Cardenas, Kathryn Beers, George H. Balazs, T. T. Jones, Thierry M. Work, Kayla C. Brignac, Sarah-Jeanne Royer, K. D. Hyrenbach, Brenda A. Jensen, Jennifer Lynch
Polymer identification of plastic marine debris can help identify its sources, degradation, and fate. We optimized and validated a fast, simple, and accessible technique, attenuated total reflectance Fourier transform infrared spectroscopy (ATR FT-IR), to
Displaying 10926 - 10950 of 74219