U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 14326 - 14350 of 74223

Nanoscale Imaging and Spectroscopy of Band Gap and defects in Polycrystalline Photovoltaic Devices

April 12, 2017
Author(s)
Yohan Yoon, Jungseok Chae, Aaron M. Katzenmeyer, Heayoung Yoon, Joshua D. Schumacher, Sang M. An, Andrea Centrone, Nikolai B. Zhitenev
Improving the power conversion efficiency of photovoltaic (PV) devices is challenging because the generation, separation and collection of electron-hole pairs in PV devices is strongly dependent on details of the nanoscale chemical composition and defects

Broadband parametric amplifiers based on nonlinear kinetic inductance artificial transmission lines

April 11, 2017
Author(s)
Jiansong Gao, Saptarshi Chaudhuri, Dale Li, Kent D. Irwin, Clint Bockstiegel, Weijie Guo, Xiangliang Liu, Johannes Hubmayr
We present broadband parametric amplifiers based on the kinetic inductance of superconducting NbTiN thin films and an artificial (lumped-element) transmission line architecture. We demonstrate two amplifier designs implementing two different phase matching

Dielectric Characterization of Confined Water in Chiral Cellulose Nanocrystal Films

April 10, 2017
Author(s)
Bharath N. Natarajan, Caglar Emiroglu, Jan Obrzut, Douglas M. Fox, Beatriz Pazmino, Jack F. Douglas, Jeffrey W. Gilman
A known deterrent to a large scale development and use of cellulose nanocrystals (CNCs) is their affinity for moisture, which has a profound effect on dispersion, wetting, interfacial adhesion, matrix crystallization and water uptake. To quantify the

Standardized Measurements of Collection Efficiency from Wipe-Sampling of Trace Explosives

April 10, 2017
Author(s)
Jennifer R. Verkouteren, Jeffrey A. Lawrence, Matthew E. Staymates, Edward R. Sisco
One of the limiting steps to detecting traces of explosives at screening venues is effective collection of the sample. Wipe-sampling is the most common procedure for collecting traces of explosives, and standardized measurements of collection efficiency

BC8 Silicon (Si-III) is a narrow-gap semiconductor

April 7, 2017
Author(s)
Haidong Zhang, Hanyu Liu, Kaya Wei, Oleksandr Kurakevych, Zhenxian Liu, Yann Godec, Joshua Martin, Michael Guerrette, George S. Nolas, Timothy A. Strobel
Large-volume, phase-pure synthesis of BC8 silicon (Ia3 ̅, cI16) has enabled bulk measurements of optical, electronic and thermal properties. Unlike previous reports that conclude BC8-Si is semimetallic, we demonstrate that this phase is a direct band gap

Combining model-based measurement results of critical dimensions from multiple tools

April 7, 2017
Author(s)
Nien F. Zhang, Bryan M. Barnes, Hui Zhou, Mark Alexander Henn, Richard M. Silver
Model-based measurement techniques use experimental data and simulations of the underlying physics to extract quantitative estimates of the measurands of a specimen based upon a parametric model of that specimen. The uncertainties of these estimates are

Light-stimulated Permanent Shape Reconfiguration in Crosslinked Polymer Microparticles

April 7, 2017
Author(s)
Lewis M. Cox, Xiaohao Sun, Chen Wang, Nancy Sowan, Jason Killgore, Rong Long, Hengan Wu, Christopher N. Bowman, Yifu Ding
Covalent adaptable networks (CANs) are cross-linked polymer networks capable reconfiguring their network topology, enabling stress relaxation and shape changing behaviors. Reversible addition-fragmentation chain transfer (RAFT) is one specific mechanism by

Qubit gates using hyperbolic secant pulses

April 7, 2017
Author(s)
Hsiang S. Ku, Junling Long, Xian Wu, Mustafa Bal, Russell Lake, Edwin Barnes, Sophia Economou, David P. Pappas
It has been known since the early days of quantum mechanics that hyperbolic secant pulses possess the unique property that they can perform cyclic evolution on two-level quantum systems independently of the pulse detuning. More recently, it was realized

Comparison of the Coordination of B 12 F 12 ^2-^, B 12 Cl 12 2- , and B 12 H 12 ^2-^ to Na + in the Solid State: Crystal Structures and Thermal Behavior of Na 2 (B 12

April 6, 2017
Author(s)
Eric V. Bukovsky, Dmitry V. Peryshkov, Hui Wu, Wei Zhou, Wan Si NMN Tang, W. Matthew Jones, Vitalie Stavila, Terrence J. Udovic, Steven H. Strauss
The synthesis of high-purity Na 2B 12F 12 and the crystal structures of Na 2(B 12F 12) (5 K neutron powder diffraction (NPD)), Na 2(H 2O) 4(B 12F 12) (120 K single-crystal X-ray diffraction (SC-XRD), Na 2(B 12Cl 12) (5 K and 295 K NPD), and Na 2(H 2O) 6(B

Hyperfine-mediated electric quadrupole shifts in Al+ and In+ ion clocks

April 6, 2017
Author(s)
Kyle P. Beloy, David R. Leibrandt, Wayne M. Itano
We evaluate the electric quadrupole moments of the 1S0 and 3P0 clock states of 27Al+ and 115In+. To capture all dominant contributions, our analysis extends through third order of perturbation theory and includes hyperfine coupling of the electrons to both

Instance Search Retrospective with Focus on TRECVID

April 5, 2017
Author(s)
George M. Awad, Wessel Kraaij, Paul Over, Shin'ichi Satoh
This paper presents an overview of the Video Instance Search benchmark which was run over a pe- riod of 6 years (2010-2015) as part of the TREC Video Retrieval (TRECVID) workshop series. The main contributions of the paper include i) an examination of the

Small Particle Driven Chain Disentanglements in Polymer Nanocomposites

April 5, 2017
Author(s)
Erkan NMN Senses, Siyam M. Ansar, Christopher L. Kitchens, Yimin NMN Mao, Suresh Narayanan, Bharath NMN Natarajan, Antonio Faraone
Using neutron spin-echo spectroscopy, X-ray photon correlation spectroscopy and bulk rheology, we studied the effect of particle size on the single chain dynamics, particle mobility, and bulk viscosity in athermal polyethylene oxide-gold nanoparticle

TRECVID 2016 Video to Text Description NEW Showcase/Pilot Task Overview

April 5, 2017
Author(s)
George M. Awad
A new pilot task was introduced and evaluated during the TRECIVD 2016 workshop cycle. The task evaluates methods that provides solutions to describe short videos into natural text descriptions and also methods that matches short videos to short english

Characterization of Chemical Properties, Unit Cell Parameters and Particle Size Distribution of Three Zeolite Reference Materials: RM 8850 - Zeolite Y, RM 8851 - Linde Type A Zeolite and RM 8852 - Ammonium ZSM-5 Zeolite

April 4, 2017
Author(s)
Shirley Turner, Robert A. Fletcher, Eric S. Windsor, Jennifer R. Verkouteren, John R. Sieber, Thomas W. Vetter, Rolf L. Zeisler, Anthony F. Marlow, M E. Davis, G J. Kennedy, W S. Borghard, S Yang, A Navrotsky, B H. Toby, James F. Kelly, Stefan D. Leigh
Zeolites have important industrial applications including use as catalysts, molecular sieves and ion exchange materials. In this study, three zeolite materials have been characterized by the National Institute of Standards and Technology (NIST) as

Development of an Improved Standard Reference Material for Vitamin D Metabolites in Human Serum

April 4, 2017
Author(s)
Karen W. Phinney, Susan S. Tai, Mary Bedner, Johanna Camara, Rosalind R. Chia, Lane C. Sander, Katherine E. Sharpless, Stephen A. Wise, James H. Yen, Rosemary L. Schleicher, Madhulika Chaudhary-Webb, Khin L. Maw, Yasamin Rahmani, Hubert W. Vesper, Joseph M. Betz, Joyce Merkel, Christopher T. Sempos, Paul M. Coates, Ramon Durazo-Arvizu, Kurtis Sarafin, Stephen P. Brooks

Perfluorinated Alkyl Acids in the Plasma of American Alligators (Alligator mississippiensis) from Florida and South Carolina

April 4, 2017
Author(s)
Jessica L. Reiner, John Bowden, Ian Christie, Matthew P. Guillette, Russell H. Lowers, Arnold Brunell, Phillip M. Wilkinson, Jacqueline T. Bangma, Thomas R. Rainwater, Louis J. Guillette Jr., Martin Jones
This study was the first to quantitate fourteen perfluoroalkyl acids (PFAAs) in 125 adult American alligators at twelve sites across the southeastern US. Of those fourteen PFAAs, nine were commonly detected. Males as a group (across all sites) showed a
Displaying 14326 - 14350 of 74223
Was this page helpful?