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NIST Authors in Bold

Displaying 18851 - 18875 of 74189

Reducing Block Copolymer Interfacial Widths through Polymer Additives

February 10, 2015
Author(s)
Daniel F. Sunday, Regis J. Kline
There is a need to design new materials to achieve smaller pitches and reduced interfacial widths for use in the nanopatterning of block copolymers (BCPs). One option is the use of blends, where the addition of a homopolymer which selectively associates to

Understanding the Decreased Segmental Dynamics of Supported Thin Polymer Films Reported by Incoherent Neutron Scattering

February 10, 2015
Author(s)
Changhuai Ye, Clinton G. Wiener, Madhu Sudan Tyagi, David Uhrig, Sara Orski, Christopher Soles, Bryan D. Vogt, David S. Simmons
Incoherent neutron scattering (INS) has commonly reported a suppression of segmental dynamics for supported thin polymer films as thickness is decreased, which is counter to expectations based on other measurement techniques such as ellipsometry and

Optical atomic clocks

February 9, 2015
Author(s)
Andrew D. Ludlow, Martin M. Boyd, Jun Ye, E. Peik, P. O. Schmidt
Optical atomic clocks represent the state-of-the-art in the frontier of modern measurement science. In this article we provide a detailed review on the development of optical atomic clocks that are based on trapped single ions and many neutral atoms. We

Decision-Theoretic Issues in Heterogeneity Variance Estimation

February 8, 2015
Author(s)
Andrew L. Rukhin
In a random-effects setting of meta-analysis the between-study variance estimation is studied from the decision-theoretic point of view. The problem concerns simultaneous inference on curve-confined natural parameters of independent heterogeneous chi

Optically pumped semiconductor lasers for atomic and molecular physics

February 7, 2015
Author(s)
Dietrich G. Leibfried, Shaun Burd, Andrew C. Wilson, David J. Wineland
Experiments in atomic, molecular and optical (AMO) physics rely on lasers at many different wavelengths and with varying requirements on spectral linewidth, power and intensity stability. Optically pumped semiconductor lasers (OPSLs), when combined with

Annual Report of the National Earthquake Hazards Reduction Program for Fiscal Year 2013

February 6, 2015
Author(s)
John(Jack) R. Hayes Jr., Steven L. McCabe, Edward Laatsch, Joy Pauschke, Bill Leith, John Filson, Tina M. Faecke
This is the annual report of the National Earthquake Hazards Reduction Program (NEHRP) for fiscal year (FY) 2013,1 presented by the NEHRP Interagency Coordinating Committee (ICC). This report, required by Public Law 108–360, describes the FY 2013

Structural and Optical Properties of Disc-in-Wire InGaN/GaN LEDs

February 6, 2015
Author(s)
Scott A. Wight, Babak Nikoobakht
This study aims to examine the role of the microstructure and optical properties of InGaN/GaN nanowire LED structures on Si (111) having different nanowire densities. Cathodoluminescence measurements show that all samples exhibit broad emission around the

A summary of the Planck constant measurements using a watt balance with a superconducting solenoid at NIST

February 5, 2015
Author(s)
Stephan Schlamminger, Richard L. Steiner, Darine El Haddad, David B. Newell, Frank C. Seifert, Leon S. Chao, Ruimin Liu, Edwin R. Williams
Researchers at the National Institute of Standards and Technology have been using a watt balance, NIST-3, to measure the Planck constant h for over ten years. Two recently published values disagree by more than one standard deviation. The motivation for

In situ SEM Study of Lithium Intercalation in individual V2O5 Nanowires

February 5, 2015
Author(s)
Evgheni Strelcov, Joshua Cothren, Donovan Leonard, Albina Y. Borisevich, Andrei Kolmakov
Progress in rational engineering of Li-ion batteries requires better understanding of the electrochemical processes and accompanying transformations in the electrode materials on multiple length scales. In spite of recent progress in transmission electron

NIST Special Publication 800-88, Revision 1: Guidelines for Media Sanitization

February 5, 2015
Author(s)
Andrew R. Regenscheid, Larry Feldman, Gregory A. Witte
NIST has published an updated version of Special Publication (SP) 800-88, Guidelines for Media Sanitization. SP 800-88 Revision 1 provides guidance to assist organizations and system owners in making practical sanitization decisions based on the

IT Security

February 4, 2015
Author(s)
Morris Chang, D. Richard Kuhn, Timothy Weil
How can IT professionals adapt to ever-changing security challenges quickly and without draining their organizations' resources? Articles in this issue highlight emerging trends and suggest ways to approach and address cybersecurity challenges. [guest

Neutron-Scattering Measurements of Spin Excitations in LaFeAsO and Ba(Fe 0.953 Co 0.047 ) 2 As 2 : Evidence for a Sharp Enhancement of Spin Fluctuations by Nematic Order

February 4, 2015
Author(s)
Qiang Zhang, Rafael M. Fernandes, Jagat Lamsal, Jiaqiang Yan, Songxue Chi, Gregory S. Tucker, Daniel K. Pratt, Jeffrey W. Lynn, R. W. McCallum, P. C. Canfield, Thomas A. Lograsso, Alan Goldman, David Vaknin, Robert J. McQueeney
Inelastic neutron scattering was employed to investigate the impact of electronic nematic order on the magnetic spectra of LaFeAsO and Ba(Fe 0.9536Cod0.047) 2As 2. These materials are ideal to study the paramagnetic-nematic state, since the nematic order

New Insights into Subsurface Imaging of Carbon Nanotubes in Polymer Composites via Scanning Electron Microscopy

February 4, 2015
Author(s)
Minhua Zhao, Bin Ming, Jae-Woo Kim, Luke J. Gibbons, Xiaohong Gu, Tinh Nguyen, Cheol Park, Peter T. Lillehei, John S. Villarrubia, Andras Vladar, James A. Liddle
Despite many studies of subsurface imaging of carbon nanotube (CNT)-polymer composites via scanning electron microscopy (SEM), significant controversy exists concerning the imaging depth and contrast mechanisms. We studied CNT-polyimide composites and, by

Photon-efficient high-dimensional quantum key distribution

February 4, 2015
Author(s)
Tian Zhong, Hongchao Zhou, Rob Horansky, Catherine Lee, Varun Verma, Adriana Lita, Alessandro Restelli, Joshua Bienfang, Richard Mirin, Thomas Gerrits, Sae Woo Nam, Francesco Marsili, Zhenshen Zhang, Ligong Wang, Dirk Englund, Gregory Wornell, Jeffrey Shapiro, Franco N. Wong
Quantum key distribution (QKD) is a secure communication technology whose security is guaranteed by the laws of physics. However, its widespread use has been hindered in part by low secure-key throughput due to the inherent loss and de-coherence of photons

Thermographic and FE Simulation of the DMLS Process at NIST

February 4, 2015
Author(s)
Brandon M. Lane, Li Ma, Shawn P. Moylan, M A. Donmez, Eric P. Whitenton, Daniel J. Falvey
A major effort of the Measurement Science for Additive Manufacturing Program at NIST is to provide high quality, well-defined temperature measurement of the DMLS process to support and validate multi-physics simulations. However, the dynamic, complex

Understanding the blue color in antique mosaic mirrored glass from the Temple of the Emerald Buddha, Thailand

February 4, 2015
Author(s)
Bruce D. Ravel, Wantana Klysubun, Christoph Hauzenberger, Prapong Klysubun, Yuying Huang, Weeraya Wongtepa, Panidtha Sombunchoo
Two samples of the blue glass produced in the middle 19th century from the Temple of the Emerald Buddha in Bangkok, Thailand, were studied in order to understand the origin of its blue color. The oxide components and trace elements are quantitatively

An Iodide-Based Li 7 P 2 S 8 I Superionic Conductor

February 3, 2015
Author(s)
Ezhiylmurugan Rangasamy, Zengcai Liu, Mallory Gobet, Kartik Pilar, Gayatri Sahu, Wei Zhou, Hui Wu, Steve Greenbaum, Chengdu Liang
A Li 7P 2S 8I solid state Li-ion conductor derived from β-Li 3PS 4 and LiI demonstrates exceptional electrochemical stability. The oxidation instability if 'I' is subverted via its incorporation into the coordinated structure. The inclusion of 'I' also

Critical Examination of the Colloidal Particle Model of Globular Proteins

February 3, 2015
Author(s)
Prasad S. Sarangapani, Steven D Hudson, Ronald L. Jones, Jack F. Douglas, Jai A. Pathak
Recent studies of globular protein solutions have uniformly adopted a colloidal view of proteins as particles, a perspective that neglects the polymeric primary structure of these biological macromolecules, their intrinsic flexibility and their ability to

Report on Pairing-based Cryptography

February 3, 2015
Author(s)
Dustin Moody, Rene C. Peralta, Ray A. Perlner, Andrew R. Regenscheid, Allen L. Roginsky, Lidong Chen
This report summarizes study results on pairing-based cryptography. The main purpose of the study is to form NIST’s position on standardizing and recommending pairing-based cryptography schemes currently published in research literature and standardized in
Displaying 18851 - 18875 of 74189
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