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Search Publications

NIST Authors in Bold

Displaying 13526 - 13550 of 73929

Strain engineering a 4a*?3a charge-density-wave phase in transition-metal dichalcogenide 1T-VSe2

July 19, 2017
Author(s)
Duming Zhang, Jeonghoon Ha, Hongwoo H. Baek, Yang-Hao Chan, Donat F. Natterer, Alline Myers, Joshua D. Schumacher, William Cullen, Albert Davydov, Young Kuk, Mei-Yin Chou, Nikolai Zhitenev, Joseph A. Stroscio
We report a new charge density wave (CDW) structure in strained 1T-VSe2 thin films synthesized by molecular beam epitaxy. The CDW structure is unconventional and exhibits a rectangular 4a×√3a periodicity, as opposed to the previously reported hexagonal 4a

An improved electronic measurement of the Boltzmann constant by Johnson noise thermometry

July 18, 2017
Author(s)
Jifeng Qu, Samuel Benz, Kevin Coakley, Horst Rogalla, Weston L. Tew, David R. White, Kunli Zhou, Zhenyu Zhou
Recent measurements using acoustic gas thermometry have determined the value of the Boltzmann constant, k, with a relative uncertainty less than 110-6. These results have been supported by a measurement with a relative uncertainty of 1.910-6 made with

Nanolayer Analysis by Neutron Reflectometry

July 18, 2017
Author(s)
Joseph A. Dura, Eric Daniel Rus, Paul Kienzle, Brian B. Maranville
Neutron reflectometry offers unique benefits for nanolayer research in green chemistry by providing accurate depth profiles of thin films and interfaces with sub-nanometer precision under in operando condition of active material in their native

Evidence of Molecular Hydrogen Trapped in Two-Dimensional Layered Titanium Carbide-Based MXene

July 17, 2017
Author(s)
Naresh C. Osti, Michael Naguib, Madhu Sudan Tyagi, Yury Gogotsi, Alexander I. Kolesnikov, Eugene Mamontov
The presence of molecular hydrogen at ambient conditions in a MXene (Ti 3C 2T x)) material is revealed by inelastic and elastic neutron scattering. Inelastic neutron scattering spectrum measured at 5 K shows a peak at 14.6 meV, providing a clear indication

Genome-wide reconstruction of complex structural variants using read clouds

July 17, 2017
Author(s)
Noah Spies, Ziming Weng, Alex Bishara, Jennifer H. McDaniel, David N. Catoe, Justin M. Zook, Marc L. Salit, Robert B. West, Serafim Batzoglou, Arend Sidow
Recently developed methods that utilize partitioning of long genomic DNA fragments, and barcoding of shorter fragments derived from them, have succeeded in retaining long-range information in short sequencing reads. These so-called read cloud approaches

Neutronics and Safety Studies on a Research Reactor Concept for Advanced Neutron Sources

July 17, 2017
Author(s)
Zeyun NMN Wu, Robert E. Williams, J. Michael Rowe, Thomas Henderson Newton, Sean O'Kelly
This paper presents the neutronics and thermal-hydraulics safety analysis results for an LEU-fueled research reactor concept being designed and studied at NIST. The main goal of the research reactor is to provide advanced neutron sources for scientific

Origin of Long Lifetime of Band-Edge Charge Carriers in organic-Inorganic Lead Iodide Perovskites

July 17, 2017
Author(s)
Tianran Chen, Wei-Liang Chen, Benjamin J. Foley, Jooseop Lee, Jacob P. C. Ruff, J. Y. Peter Ko, Craig Brown, Leland Harriger, Depei Zhang, Changwon Park, Mina Yoon, Yu-Ming Chang, Joshua J. Choi, Seung-Hun Lee
Long carrier lifetime is what makes hybrid organic-inorganic perovskites (HOIPs) high performance photovoltaic materials. The microscopic mechanism behind the unusually long carrier lifetime of greater than equal to} 1 υs is not well understood. Here we

An HL7 v2 Platform for Standards Development and Testing

July 16, 2017
Author(s)
Sandra I. Martinez, Robert D. Snelick
Development of healthcare data exchange standards has long been problematic, plagued with ambiguous and inconsistent requirement specifications. This situation leads to potential misinterpretation by implementers, thus limiting the effectiveness of the

Atom-based RF electric field metrology above 100 GHz

July 16, 2017
Author(s)
Christopher L. Holloway, Matthew T. Simons, Joshua A. Gordon
While atom-based radio-frequency (RF) electric field probes have the potential to improve electric field measurements for a broad range of frequencies (from a few GHz to 100s of GHz) and field strengths (mV/m to kV/m), extending the measurement

Synchrophasor Sensor Networks for Grid Communication and Protection

July 15, 2017
Author(s)
Hamid Gharavi
This paper focuses primarily on leveraging synchronized current/voltage amplitudes and phase angles measurements to foster new categories of applications, such as improving the effectiveness of grid protection and minimizing outage duration for distributed

Fast-Responding Bio-Based Shape Memory Thermoplastic Polyurethanes

July 14, 2017
Author(s)
Zoran S. Petrovic, Jelena Milic, Fan Zhang, Jan Ilavsky
Fast response shape-memory polyurethanes were prepared from bio-based polyols, diphenyl methane diisocyanate and butane diol. The bio-based polyester polyols were synthesized from 9-hydroxynonanoic acid, a product obtained by ozonolysis of fatty acids

Measurement Challenges for 5G and Beyond

July 14, 2017
Author(s)
Catherine A. Remley, Jeffrey A. Jargon, Joshua A. Gordon, Alexandra E. Curtin, David R. Novotny, Christopher L. Holloway, Robert D. Horansky, Michael S. Allman, Jeanne T. Quimby, Camillo A. Gentile, Peter B. Papazian, Ruoyu Sun, Damir Senic, Jelena Senic, Matthew T. Simons, Maria G. Becker, Dylan F. Williams, Richard A. Chamberlin, Jerome G. Cheron, Ari D. Feldman, Paul D. Hale, Mohit S. Mujumdar, Nada T. Golmie
National Metrology Institutes (NMIs) around the world are charged with supporting industry through improved measurement science and by providing a traceability path to fundamental physical standards. Mobile wireless communications have become a ubiquitous

Quantitative characterization of gold nanoparticles by size-exclusion and hydrodynamic chromatography, coupled to inductively coupled plasma mass spectrometry and quasi-elastic light scattering

July 14, 2017
Author(s)
Leena M. Pitkanen, Antonio Montoro Bustos, Karen E. Murphy, Michael R. Winchester, Andre Striegel
The physicochemical characterization of nanoparticles, in general, and of gold nanoparticles (Au NPs), in particular, is of paramount importance for tailoring and optimizing the properties of these materials in specific applications, as well as for

Exposure to Engineered Nanomaterials: Impact on DNA Repair Pathways

July 13, 2017
Author(s)
Neenu Singh, Bryant C. Nelson, Leona D. Scanlan, Erdem Coskun, Pawel Jaruga, Shareen Doak
Some engineered nanomaterials (ENMs) may have the potential to cause damage to the genetic material in living systems. The mechanistic machinery functioning at the cellular/molecular level, in the form of DNA repair processes, has evolved to help
Displaying 13526 - 13550 of 73929
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