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Search Publications

NIST Authors in Bold

Displaying 10076 - 10100 of 73697

A New Perspective on an Old Problem: Scattering by a Perfect Electric Conductor

April 14, 2019
Author(s)
Alexey J. Yuffa, Johannes Markkanen, Qiang Sun, Evert Klaseboer, Derek Y. Chan
We explore several different singular surface integral equation formulations. These formulations are specifically designed for time-harmonic scattering by a perfect electric conductor and are obtained by choosing non-conventional boundary unknowns.

Crystallographic orientation dependence of work function: carbon adsorption on Au surfaces

April 14, 2019
Author(s)
Dustin A. Hite, Hossein Jooya, X Fan, Kyle S. McKay, David P. Pappas, H.R. Sadeghpour
We show in this work that the work function change due to carbon adatom adsorption is not predominantly affected by the crystallographic orientation of the gold surface. Ab-initio calculations within density-functional theory are performed on carbon

Indoor Localization Accuracy of Major Smartphone Location Apps

April 14, 2019
Author(s)
Nader Moayeri, Chang Li, Lu Shi
NIST carried out comprehensive testing in five large buildings to evaluate the accuracy of Fused Location Provider (FLP) Application Programming Interface (API) running on Android phones with that of Core Location Framework running on iPhones. The testing

Review of the National Institute of Standards and Technology Research Program in Trace Contraband Detection

April 14, 2019
Author(s)
J Greg Gillen, Jennifer R. Verkouteren, R. Michael Verkouteren, Marcela Najarro, Edward Sisco, Matthew Staymates, Jessica L. Staymates, Robert A. Fletcher, Jeffrey Lawrence, Elizabeth Robinson, Alexander T. Bulk, Joe Bennett, Shin Muramoto, Thomas Forbes
Current national priorities in homeland security have led to an unprecedented level of utilization of explosives trace detection (ETD) systems for counterterrorism and law enforcement. Despite the widespread deployment of ETD instruments at airports

Fracture Sequences During Elastic-Plastic Indentation of Brittle Materials

April 12, 2019
Author(s)
Robert F. Cook
A fracture analysis is developed for crack initiation sequences occurring during sharp indentation of brittle materials. Such indentations, generated by pyramidal or conical loading, generate elastic and plastic deformation. The analysis uses a non-linear

Ligand-based stability changes in duplex DNA measured with a microscale electrochemical platform

April 12, 2019
Author(s)
Sarah M. Robinson, Zuliang Shen, Jon R. Askim, Christopher B. Montgomery, Herman O. Sintim, Stephen Semancik
Development of technologies for rapidly screening the thermal stability of DNA secondary structures and the effects on stability for binding of small molecule drugs is important to the drug discovery process. In this report, we describe the capabilities of

Reusable Constructs of Manufacturing Processes for Processing Industries

April 12, 2019
Author(s)
Mahesh Mani, KC Morris, Kevin W. Lyons, William Z. Bernstein
This article specifically explores the new ASTM International Standard Guide for Characterizing Environmental Aspects of Manufacturing Processes and its applicability for the Chemical Industry. The standard provides guidance for industries to examine unit

Optimal Cache Allocation under Network-Wide Capacity Constraint

April 11, 2019
Author(s)
Van Sy Mai, Stratis Ioannidis, Davide Pesavento, Lotfi Benmohamed
Network cache allocation and management are important aspects of an Information-Centric Network (ICN) design, such as one based on Named Data Networking (NDN). We address the problem of optimal cache size allocation and content placement in an ICN in order

Reduction of light shifts in Ramsey spectroscopy with a combined error signal

April 11, 2019
Author(s)
Moshe Shuker, Juniper Wren Y. Pollock, Rodolphe Boudot, V. I. Yudin, A. V. Taichenachev, John E. Kitching, Elizabeth A. Donley
Light-induced frequency shifts can be a key limiting contribution to the mid and long-term frequency stability in atomic clocks. In this letter, we demonstrate the experimental implementation of the combined error signal (CES) interrogation protocol to a

Towards the optical second: verifying optical clocks at the SI limit

April 11, 2019
Author(s)
William F. McGrew, Xiaogang Zhang, Robert J. Fasano, Holly Leopardi, Daniele Nicolodi, Kyle P. Beloy, Jian Yao, Jeffrey A. Sherman, Stefan A. Schaeffer, Joshua J. Savory, Stefania Romisch, Christopher W. Oates, Thomas E. Parker, Tara M. Fortier, Andrew D. Ludlow
The pursuit of ever more precise measures of time and frequency motivates redefinition of the second in terms of an optical atomic transition. To ensure continuity with the current definition, based on the microwave hyperfine transition in 133Cs, it is

Racial Disparity in Maternal Phthalates Exposure; Association with Racial Disparity in Fetal Growth and Birth Outcomes

April 10, 2019
Author(s)
Michael S. Bloom, Abby G. Wenzel, John W. Brock, Rebecca J. Wineland, Lori Cruze, Elizabeth R. Unal, Assem Jiyessova, Roger B. Newman, John Kucklick
Background: Experimental and observational data implicate phthalates as developmental toxicants. However, few data are available to assess the maternal risks of gestational exposure by race and infant sex. Objectives: To characterize associations between

Time to Standardize Threshold Schemes for Cryptographic Primitives

April 10, 2019
Author(s)
Luis Brandao, Michael S. Davidson, Nicky W. Mouha, Apostol T. Vassilev
This bulletin summarizes the information found in NISTIR 8214: Threshold Schemes for Cryptographic Primitives. NIST is interested in promoting the security of implementations of cryptographic primitives. This security depends not only on the theoretical

Spontaneous current constriction in threshold switching devices

April 9, 2019
Author(s)
Jonathan Goodwill, Georg Ramer, Dasheng Li, Brian Hoskins, Georges Pavlidis, Jabez J. McClelland, Andrea Centrone, James A. Bain, Marek Skowronski
Threshold switching devices exhibit extremely non-linear current-voltage characteristics, which are of increasing importance for a number of applications including solid-state memories and neuromorphic circuits. It has been proposed that such non-linear

UCEF 1.0.0-ALPHA Kickoff Workshop: Workshop Report

April 9, 2019
Author(s)
Martin J. Burns, Thomas P. Roth
This report summarizes the results of a workshop held at NIST on July 27, 2017. The goal of this workshop was to introduce participants to the newly constructed Universal CPS Environment for Federation (UCEF). Over 40 attendees were provided with the UCEF

Advancing and Accelerating Materials Innovation: New Frontiers for the Materials Genome Initiative

April 5, 2019
Author(s)
Juan J. DePablo, Nicholas E. Jackson, Michael Webb, Long-Qing Chen, Joel Moore, Dane Morgan, Tresa M. Pollock, Darrell G. Schlom, Eric Toberer, James Analytis, Ismalia Dabo, Dean DeLongchamp, Fiete Gregory, Gregory Grason, Geoffroy Hautier, Yifei Mo, Krishna Rajan, Evan Reed, Efrain E. Rodriguez, Vladan Stevanovic, Jin Suntivich, Katsuo Thornton, Ji-Cheng Zhao
The Materials Genome Initiative (MGI) advanced a new paradigm for materials discovery, namely that the pace of materials discovery could be accelerated via complementary efforts in theory, computation, and experiment. Along with numerous successes, new

Tuning Kerr-Soliton Frequency Combs to Atomic Resonances

April 5, 2019
Author(s)
Su P. Yu, Travis Briles, Gregory Moille, Xiyuan Lu, Scott Diddams, Kartik Srinivasan, Scott Papp
Frequency combs based on nonlinear optical phenomena in integrated photonics are a versatile light source that can explore new applications, including frequency metrology, optical communications, and sensing. We demonstrate robust frequency-control
Displaying 10076 - 10100 of 73697
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