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Search Publications

NIST Authors in Bold

Displaying 21151 - 21175 of 73697

Optimized superconducting detectors using the proximity effect in Ti/TiN multilayers

June 14, 2013
Author(s)
David P. Pappas, Michael R. Vissers, Jiansong Gao, Martin O. Sandberg, David S. Wisbey, Kent D. Irwin
We apply the superconducting proximity effect in TiN/Ti multi-layers films to tune the critical temperature, $T_C$ (to within 10 mK) with high uniformity (less than 15 mK spread) across a 75 mm wafer. Reproducible $T_C$'s are obtained from 0.8 - 2.5 K

SemEval-2013 Task 7: The Joint Student Response Analysis and 8th Recognizing Textual Entailment Challenge

June 14, 2013
Author(s)
Myroslava Dzikovska, Rodney Nielsen, Chris Brew, Claudia Leacock, Danilo Giampiccolo, Luisa Bentivogli, Peter Clark, Ido Dagan, Hoa T. Dang
We present the results of the Joint Student Response Analysis and 8th Recognizing Textual Entailment Challenge, aiming to bring together researchers in educational NLP technology and textual entailment. The task of giving feedback on student answers

MEMS Device for Fatigue Testing of 25 mm Thick Aluminum Specimens

June 13, 2013
Author(s)
Li-Anne Liew, David T. Read, Nicholas Barbosa
We report the development and demonstration of a MEMS test instrument to perform fatigue testing on 25 µm thick aluminum 1145 H19 foil. Both the foil material and the specimen fabrication were obtained from commercial sources, separate from the fabrication

The Spin Hall Effect in a Quantum Gas

June 13, 2013
Author(s)
Matthew C. Beeler, Ross A. Williams, Karina K. Jimenez Garcia, Lindsay J. LeBlanc, Abigail R. Perry, Ian B. Spielman
Electronic properties like current flow are usually unaffected by the electron’s spin angular momentum, an internal degree of freedom present in quantum particles that can usually be either “up” or “down”. The spin-Hall effects (SHEs), first proposed 40

ITL Updates Glossary of Key Information Security Terms

June 12, 2013
Author(s)
Elizabeth B. Lennon
This ITL Bulletins describes the recent update of NISTIR 7298, Glossary of Key Information Security Terms. NISTIR 7298, Revision 2, provides a summary glossary of terms used in NIST publications and other relevant sources.

Formation of Disk- and Stacked Disk-Like Self-Assembled Morphologies from Cholesterol Functionalized Aliphatic Polycarbonate Containing Amphiphilic Diblock Copolymers

June 10, 2013
Author(s)
Vivek M. Prabhu, Shrinivas Venkataraman, Ashlynn Lee, Yi Yan Yang, James Hedrick, Hareem Maune
In this study, a cholesterol functionalized aliphatic cyclic carbonate monomer, 2-(5-methyl-2-oxo-1,3-dioxane-5-carboxyloyloxy)ethyl carbamate (MTC-Chol) was synthesized. The organo-catalytic ring opening polymerization of MTC-Chol was accomplished by

High-Resolution Photocurrent Microscopy Using Near-Field Cathodoluminescence of Quantum Dots

June 10, 2013
Author(s)
Heayoung Yoon, Youngmin Lee, Christopher C. Bohn, Seung H. Ko, Anthony G. Gianfrancesco, Jonathan S. Steckel, Seth Coe-Sullivan, Albert A. Talin, Nikolai B. Zhitenev
We report a fast, versatile photocurrent imaging technique to visualize the local photo response of solar energy devices and optoelectronics using near-field cathodoluminescence (CL) from a homogeneous quantum dot layer. This approach is quantitatively

Hydrated Phases in Blended Cement Systems and Synthetic Saltstone Grouts

June 10, 2013
Author(s)
Kenneth A. Snyder, Paul E. Stutzman
A blended binder system (10 % portland cement, 45 % fly ash, and 45 % slag) is characterized as part of a broader study of its long-term effectiveness in stabilizing treated salt waste at the Savannah River Site. The binder system is reproduced in the

Mechanochromic photonic gels

June 10, 2013
Author(s)
Edwin P. Chan, A M. Urbas, Joseph J. Walish, Edwin L. Thomas
Polymer gels are remarkable materials with physical structures that can adapt significantly and quite rapidly with changes in the local environmental changes such as temperature, light intensity, electrochemistry, and mechanical force. An interesting

Nanosecond-scale timing jitter in transition edge sensors at telecom and visible wavelengths

June 10, 2013
Author(s)
Antia A. Lamas-Linares, Brice R. Calkins, Nathan A. Tomlin, Thomas Gerrits, Adriana Lita, Joern Beyer, Richard Mirin, Sae Woo Nam
Transition edge sensors (TES) have the highest reported efficiencies (> 98%) for single photon detection in the visible and near infrared. Experiments in quantum information and foundations of physics that rely on this efficiency have started incorporating

The Effect of Turbulence on a Multi-Hole Pitot Calibration

June 10, 2013
Author(s)
Christopher J. Crowley, Iosif I. Shinder, Michael R. Moldover
Abstract- Accurate calibrations of multi-hole Pitot tubes require thousands of measurements spanning ranges of the fluid’s velocity, and the pitch and yaw angles. When calibrating a commercially-manufactured multi-hole Pitot tube in NIST’s low-turbulence

Efficient, low-noise, single-photon frequency conversion

June 9, 2013
Author(s)
Paulina S. Kuo, Jason S. Pelc, Oliver T. Slattery, Yong-Su Kim, M. M. Fejer, Xiao Tang
We demonstrate simultaneous low-noise and efficient frequency conversion in a periodically poled LiNbO3 waveguide with spectral filtering. We achieve >50% external conversion efficiency and 600 noise counts per second at peak conversion.

Free-space optical time-frequency transfer over 2 km

June 9, 2013
Author(s)
William C. Swann, Fabrizio R. Giorgetta, Laura C. Sinclair, Esther Baumann, Ian R. Coddington, Nathan R. Newbury
Precision free-space time-frequency transfer could advance fields where present microwave-based transfer is inadequate. We demonstrate an optical free-space link with femtosecond timing deviation and residual instability below 10 −18 at 1000 seconds.

Open-Path Dual-Comb Spectroscopy of Greenhouse Gases

June 9, 2013
Author(s)
Greg B. Rieker, Fabrizio R. Giorgetta, William C. Swann, Ian R. Coddington, Laura C. Sinclair, Christopher L. Cromer, Esther Baumann, Alexander M. Zolot, Nathan R. Newbury
Frequency-comb spectroscopy in the near-infrared is used to measure atmospheric CO2 and H2O concentrations over a 2-km outdoor open-air path. This technique shows promise for measurements over length scales between point sensors and satellite systems.

Anchor Molecules Affect Structure and Properties of Tethered Bilayer Lipid Membranes. Unsaturation in the Alkyl Chains.

June 7, 2013
Author(s)
David J. Vanderah, Rima Budvytyte, Gintaras Valincius, Gediminas Niaura, Vladislava Voiciuk, Mindaugas Mickevicius, Haw-Zan Goh, Hilary Stauffer, Frank Heinrich, Siddharth Shenoy
The self-assembled monolayers (SAMs) of the new lipidic anchor molecule, Z 20-(Z-octadec-9-enyloxy)-3,6,9,12,15,18,22-heptaoxatetracont-31-ene-1-thiol (HC18), and mixed HC18/-mercaptoethanol (ME) SAMs were studied by spectroscopic ellipsometry, contact
Displaying 21151 - 21175 of 73697
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