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Search Publications

NIST Authors in Bold

Displaying 10051 - 10075 of 73697

Femtosecond Time Synchronization of Optical Clocks Off a Flying Quadcopter

April 18, 2019
Author(s)
Hugo Bergeron, Laura C. Sinclair, William C. Swann, Isaac H. Khader, Kevin C. Cossel, Michael A. Cermak, Jean-Daniel Deschenes, Nathan R. Newbury
Optical clock networks promise advances in global navigation, time distribution, coherent sensing, relativity experiments, dark matter searches and other areas1-12. Such networks will need to compare and synchronize clocks over free-space optical links

REFRACTIVE-INDEX GAS THERMOMETRY

April 18, 2019
Author(s)
Patrick Rourke, Christof Gaiser, Roberto M. Gavioso, Michael R. Moldover, Laurent Pitre, Robin Underwood
The principles and techniques of primary refractive-index gas thermometry (RIGT) are reviewed. Absolute primary RIGT using microwave measurements of helium-filled quasi-spherical resonators has been implemented at the temperatures of the triple points of

Layer-by-Layer Thinning of MoS2 via Laser Irradiation

April 17, 2019
Author(s)
Bien Cuong Tran Khac, Ryan White, Frank W. DelRio, Koo-hyun Chung
Layer-by-layer thinning of molybdenum disulfide (MoS2) via laser irradiation was examined using Raman spectroscopy and atomic force microscopy. In particular, the effects of number of layers, laser conditions, and substrate were systematically identified

PFHub: The Phase-Field Community Hub

April 17, 2019
Author(s)
Daniel Wheeler, Trevor Keller, Jonathan E. Guyer, James A. Warren, Stephen DeWitt, Andrea Jokisaari, Daniel Schwen, Larry Aagesen, Olle Heinonen, Michael Tonks, Peter Voorhees
An online portal provides a valuable space for scientific communities to summarize a shared challenge, collect attempts at a solution, and present a quantitative comparison of past attempts in a compelling way. An exemplar of such a portal is μMAG. The

Replication of Smart-City, Internet of Things Assets in a Municipal Deployment

April 17, 2019
Author(s)
Sokwoo Rhee, Cuong T. Nguyen, Alexander Nelson, Greg Toth, Dennis Linders
Recent efforts to integrate Internet of Things into Smart City constructs have proven successful through proof of concept deployments in multiple cities. To facilitate additional deployments, standardization and dissemination of best practices for these

Strategies for robust and accurate measurement of nanomaterial bioaccumulation

April 17, 2019
Author(s)
Elijah J. Petersen, Monika Mortimer, Robert Burgess, Richard Handy, Shannon Hanna, Kay Ho, Monique E. Johnson, Susana Louriero, Selck Henriette, Janeck Scott-Fordsmand, David Spurgeon, Jason Unrine, Nico van den Brink, Ying Wang, Jason White, Patricia Holden
One of the key components for environmental risk assessment of engineered nanomaterials (ENMs) is data on bioaccumulation potential. Accurately measuring bioaccumulation can be critical for regulatory decision making regarding material hazard and risk, and

Reproducible Performance Improvements to Monolayer MoS2 Transistors through Exposed Material Forming Gas Annealing

April 16, 2019
Author(s)
Nicholas B. Guros, Son T. Le, Siyuan Zhang, Brent A. Sperling, Jeffery B. Klauda, Curt A. Richter, Arvind Balijepalli
We have developed an optimized process to realize high-performance field-effect transistor (FET) arrays from large-area 2D MoS2 films with an average yield of 85 %. A central element of the technique is a new exposed film forming gas anneal (EF- FGA) that

Wireless Network Design for Emerging IIoT Applications: Reference Framework and Use Cases

April 16, 2019
Author(s)
Yongkang Liu, Mohamed T. Hany, Kang B. Lee, Lotfi Benmohamed, Richard Candell
In this paper we propose a framework that allows a designer to assess various physical and cyber factors involved in determining the performance of a wireless use case as well as evaluate their performance impacts in search for a design that leads to an

Dual comb spectroscopy with tailored spectral broadening in nanophotonic Si3N4

April 15, 2019
Author(s)
Esther Baumann, Edgar Perez, Gabriel M. Colacion, Fabrizio Giorgetta, Kevin Cossel, Gabriel Ycas, David Carlson, Kartik Srinivasan, Scott Papp, Ian Coddington, Nathan Newbury
Spectral broadening of compact robust Er+: fiber combs is demonstrated with tailored Si3N4 waveguides to obtain spectrally-smooth broadened light in the 2 μm 2.5 μm atmospheric water window for gas spectroscopy. This successfully extends the Er+ spectrum

Examining American Alligators as Sentinels of Toxic Trace Element Exposure in Human Populations

April 15, 2019
Author(s)
Frances Nilsen, Thomas Rainwater, Stephen E. Long, Tracey Johnston, Philip Wilkinson, Arnold Brunell, Brittany Kassim, John A. Bowden
Mercury (Hg) is a ubiquitous toxic element eliciting a myriad of health problems including Minamata disease. Exposure to methylmercury, the most toxic bioaccumulative form of Hg, occurs through aquatic dietary sources. Many nations have consumption

Indistinguishable single-mode photons from spectrally engineered biphotons

April 15, 2019
Author(s)
Thomas Gerrits, Adriana E. Lita, Sae Woo Nam, Changchen Chen, Jane Heyes, Kyung-Han Hong, Jeffrey Shapiro, Franco N. Wong
We use pulsed spontaneous parametric down-conversion in KTiOPO4, with a Gaussian phasematching function and a transform-limited Gaussian pump, to achieve near-unity spectral purity in heralded single photons at telecommunication wavelength. Theory shows

Optimal Dynamic Spectrum Access Scheme for Utilizing White Space in LTE Systems

April 15, 2019
Author(s)
Anirudha Sahoo, Timothy Hall, Robert C. Hagwood
In this study, we design and implement an algorithm for optimal dynamic spectrum access (DSA) in a shared spectrum system where the primary user (PU) is a Long Term Evolution (LTE) system. The cumulative hazard function from survival analysis is used to

Principles for Designed-In Security and Privacy for Smart Cities

April 15, 2019
Author(s)
Corey Dickens, Paul A. Boynton, Sokwoo Rhee
This paper presents the design and implementation of a process for an exploratory study that identifies a set of principles for designed-in security and privacy for smart city projects from among Global City Teams Challenge (GCTC) - Smart and Secure Cities

Sources of Errors in Structured Light 3D Scanners

April 15, 2019
Author(s)
Prem K. Rachakonda, Bala Muralikrishnan, Daniel S. Sawyer
Structured light (SL) scanners have been commercially available for over a decade and some commercial scanners are evaluated using one of two German guidelines – VDI/VDE 2634 parts 2 and/or 3. Several other research groups and NMIs have developed physical

Spin-current-mediated Rapid Magnon Localisation and Coalescence After Ultrafast Optical Pumping of Ferrimagnetic Alloys

April 15, 2019
Author(s)
Ezio E. Iacocca, TianMin Liu, Alexander H. Reid, Z Fu, S Ruta, P. W. Granitzka, E Jal, S. Bonetti, A. Gray, C E. Graves, R Kukreja, Z Chen, Daniel Higley, T Chase, L L. Guyader, K Hirsch, H Ohldag, W F. Schlotter, G L. Dakovski, Giacomo Coslovich, M C. Hoffmann, S Carron, A Tsukamoto, A Kirilyuk, A V. Kimel, Th Rasing, J Stohr, R F. Evans, T Ostler, R W. Chantrell, M A. Hoefer, Thomas J. Silva, H A. Durr
Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty
Displaying 10051 - 10075 of 73697
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