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NIST Authors in Bold

Displaying 12626 - 12650 of 73929

The NIST Johnson noise thermometry system for the determination of the Boltzmann constant

December 29, 2017
Author(s)
Nathan Flowers-Jacobs, Alessio Pollarolo, Kevin Coakley, Adam C. Weis, Anna Fox, Horst Rogalla, Weston L. Tew, Samuel Benz
In preparation for the redefinition of the International System of Units (SI), five different electronic measurements of the Boltzmann constant have been performed using different Johnson noise thermometry (JNT) systems over the past seven years. In this

The Permeability of Vacuum and the Revised International System of Units

December 29, 2017
Author(s)
Ronald B. Goldfarb
The International System of Units (SI) is expected to be revised such that all seven base units, including the kilogram, will be defined in terms of fixed numerical values of seven defining constants. The revised SI will include a redefinition of the

Natural Uranium Radioactivity Solution Standard: SRM 4321d

December 27, 2017
Author(s)
Ronald Colle, Lizbeth Laureano-Perez, Svetlana Nour, Jerome J. LaRosa, Brian E. Zimmerman, Leticia S. Pibida, Denis E. Bergeron
A new natural uranium solution standard has been produced and will be disseminated by the National Institute of Standards and Technology (NIST) as Standard Reference Material 4321d. The standard is certified for the massic activities of 234U, 235U, and

Zinc Doped Copper Ferrite Particles as Temperature Sensors for Magnetic Resonance Imaging

December 27, 2017
Author(s)
Karl Stupic, Janusz H. Hankiewicz, Zbigniew Celinski, Robert E. Camley, Marek Przybylski, Jan Zukrowski, Nick Anderson, Noweir Alghamdi, Nicholas Hammelev
We investigate the use of Cu0.35Zn0.65Fe2O4 particles as temperature-dependent sensors in magnetic resonance imaging (MRI). This material has a Curie temperature near 290 K, but in the large magnetic fields found in MRI scanners there is a significant

Nanoscale Heterogeneities in Monolayer MoSe2 Revealed by Correlated Scanning Probe Microscopy and Tip-Enhanced Raman Spectroscopy

December 26, 2017
Author(s)
Albert Davydov, Sergiy Krylyuk, Payam Taheri, Kirby K. Smithe, Andrey V. Krayev, Connor S. Bailey, Hye R. Lee, Eilam Yalon, Ozgur B. Aslan, Miguel M. Rojo, Tony F. Heinz, Eric Pop
Understanding growth, grain boundaries (GBs), and defects of emerging two-dimensional (2D) materials is key to enabling their future applications. For quick, non-destructive metrology, many studies rely on confocal Raman spectroscopy, whose spatial

Order-Disorder Transitions and Superionic Conductivity in the Sodium Nido-Undeca(carba)borates

December 26, 2017
Author(s)
Wan Si NMN Tang, Mirjana NMN Dimitrievska, Vitalie Stavila, Wei Zhou, Hui Wu, A. Alec Talin, Terrence J. Udovic
The salt compounds NaB 11H 14, Na-7-CB 10H 13, Li-7-CB 10H 13, Na-7,8-Cd2^B 9H 12, and Na-7,9-C 2B 9H 12 all contain geometrically similar, monocharged, nido-undeca(carba)borate anions (i.e., truncated icosohedral-shaped clusters constructed of only eleven

Quantum Phases of Two-Component Bosons with Spin-Orbit Coupling in Optical Lattices

December 26, 2017
Author(s)
Ian B. Spielman, Carlos S? de Melo, Daisuke Yamamoto
Ultracold bosons in optical lattices are one of the few systems where bosonic matter is known to exhibit strong correlations. Here, to push the frontier of our understanding of interacting bosons in optical lattices, we add synthetic spin-orbit coupling

Total Break of the SRP Encryption Scheme

December 23, 2017
Author(s)
Ray A. Perlner, Albrecht R. Petzoldt, Daniel C. Smith-Tone
Multivariate Public Key Cryptography (MPKC) is one of the main candidates for secure communication in a post-quantum era. Recently, Yasuda and Sakurai proposed in [7] a new multivariate encryption scheme called SRP, which combines the Square encryption

Extending and Evaluating the Model-based Product Definition

December 22, 2017
Author(s)
Nathan W. Hartman, Jesse Zahner, Thomas D. Hedberg Jr., Allison Barnard Feeney
Industrial practice is in a state of transition, away from the use of drawings towards the use of annotated 3D CAD models as a means of communication. Working as a representation of an object or a system, a model-based product definition (MBD) is used to

Internet of Things (IoT) Cybersecurity Colloquium

December 22, 2017
Author(s)
Benjamin M. Piccarreta, Katerina N. Megas, Danna G. O'Rourke
This report provides an overview of the topics discussed at the “Internet of Things (IoT) Cybersecurity Colloquium” hosted on NIST’s campus in Gaithersburg, Maryland on October 19, 2017. It summarizes key takeaways from the presentations and discussions

A Layered Graphical Model for Mission Attack Impact Analysis

December 21, 2017
Author(s)
Changwei Liu, Anoop Singhal, Duminda Wijesekera
In this paper, we describe a layered graphical model to analyze the mission impacts of attacks for forensic investigation. Our model has three layers: the upper layer models operational tasks and their dependencies; the middle layer reconstructs attack

A workshop report on Electron Microscopy Frontiers: Challenges and Opportunities

December 21, 2017
Author(s)
June W. Lau, John E. Bonevich, Andrew A. Herzing, Ann C. Chiaramonti Debay, Robert R. Keller
For two days beginning on March 8, 2017, a planning workshop entitled “Electron Microscopy Frontiers: Opportunities and Challenges” was hosted by the Material Measurement Laboratory (MML) of the National Institute of Standards and Technology (NIST). Grass

GaN Nanowire MOSFET with Near-Ideal Subthreshold Slope

December 21, 2017
Author(s)
Kristine A. Bertness, Wenjun Li, Matthew D. Brubaker, Bryan T. Spann, Patrick Fay
Top-gated GaN nanowire MOSFETs using Al2O3 as gate oxide have been experimentally demonstrated. The fabricated devices exhibit a minimum subthreshold slope of 60 mV/dec, an average subthreshold slope of 68 mV/dec over three decades of drain current, drain

Guide to LTE Security

December 21, 2017
Author(s)
Jeffrey A. Cichonski, Joshua M. Franklin, Michael J. Bartock
Cellular technology plays an increasingly large role in society as it has become the primary portal to the internet for a large segment of the population. One of the main drivers making this change possible is the deployment of 4th generation (4G) Long

Multivariable Extrapolation of Grand Canonical Free Energy Landscapes

December 21, 2017
Author(s)
Nathan Mahynski, Jeffrey R. Errington, Vincent K. Shen
We derive an approach for extrapolating the free energy landscape of multicomponent systems in the grand canonical ensemble, obtained from flat- histogram Monte Carlo simulations, from one set of temperature and chemical potentials to another. This is
Displaying 12626 - 12650 of 73929
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