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Journals

An analysis of evacuation travel paths on stair landings by means of conditional probabilities

February 20, 2014

Author(s)

Enrico Ronchi, Paul A. Reneke, Erica D. Kuligowski, Richard D. Peacock

This paper provides the analysis of a data-set about people movement on stair landings collected during an evacuation drill performed in a six-storey office

Detection of 3D Interconnect Bonding Voids by IR Microscopy

February 20, 2014

Author(s)

Jonny H?glund, Zoltan Kiss, Gyorgy Nadudvari , Zsolt Kovacs, Szabolcs Velkei, Moore Chris, Victor H. Vartanian, Richard A. Allen

There are a number of factors driving 3D integration including reduced power consumption, RC delay, and form factor as well as increased bandwidth. However

Assessing Vitamin D Status: Time for a Rethink?

February 19, 2014

Author(s)

Karen W. Phinney, Graham D. Carter

Current induced torques between ferromagnets and compensated antiferromagnets: symmetry and phase coherence effects.

February 19, 2014

Author(s)

Paul M. Haney, Karthik Prakhya, Adrian Popescu

It is shown that the current-induced torques between a ferromagnetic layer and an antiferromagnetic layer with a compensated interface vanish when the

Top-Down Fabrication of Large-Area GaN Micro and Nano Pillars

February 19, 2014

Author(s)

Albert Davydov, Ratan K. Debnath, B. Wen, Dipak Paramanik, Abhishek Motayed, M. King

Large-area gallim nitride (GaN) nanopillars (NPs) arrays were fabricated by plasma etching of lithographically patterned GaN thin-film grown on Si substrate

Neutron Measurements of Stresses in a Test Artifact produced by Laser-based Additive Manufacturing

February 18, 2014

Author(s)

Thomas H. Gnaeupel-Herold, John A. Slotwinski, Shawn P. Moylan

A stainless steel test artifact produced by Direct Metal Laser Sintering and similar to a proposed standardized test artifact was examined using neutron

Complex Structures of Different CaFe₂As₂ Samples

February 18, 2014

Author(s)

Bayrammurad Saparov, Claudia Cantoni, Minghu Pan, Thomas C. Hogan, William D. Ratcliff, Stephen D. Wilson, Katharina Fritsch, Bruce D. Gaulin, Athena S. Sefat

We use temperature-dependent X-ray and neutron diffraction, low-temperature scanning tunneling microscopy, and room-temperature scanning-transmission electron

Dependence of Soot Optical Properties on Particle Morphology: Measurements and Model Comparisons

February 18, 2014

Author(s)

James Radney, Rian You, Xiaofei Ma, Joseph Conny, Michael R. Zachariah, Joseph T. Hodges, Christopher D. Zangmeister

We measure the mass-specific absorption and extinction cross sections for laboratory-generated soot aerosols. Two soot morphologies are investigated, both

In situ temperature measurements for selective epitaxy of GaN nanowires

February 17, 2014

Author(s)

Kristine A. Bertness, Matthew D. Brubaker, Todd E. Harvey, Shannon M. Duff, Aric W. Sanders, Norman A. Sanford

We demonstrate with spatially resolved, in situ temperature measurements and ex situ reflectance measurements that differences in appearance for masked and

Integrating human sequence data sets provides a resource of benchmark SNP and indel genotype calls

February 16, 2014

Author(s)

Justin M. Zook, Brad Chapman, Winston Hide, Marc L. Salit

Clinical adoption of human genome sequencing requires methods that output genotypes with known accuracy at millions or billions of positions across a genome

Hyperfine structure in 229g-Th³⁺ as a probe of the 229g-Th -> 229m-Th nuclear excitation energy

February 14, 2014

Author(s)

Kyle P. Beloy

We identify a potential means to extract the 229g-Th -> 229m-Th nuclear excitation energy from precision microwave spectroscopy of the 5F 5/2,7/2 hyperfine

Hysteresis in Quantized Superfluid Atomtronic Circuit

February 14, 2014

Author(s)

Stephen P. Eckel, Jeffrey Lee, Fred Jendrzejewski, Noel Murray, Charles W. Clark, Christopher J. Lobb, William D. Phillips, Edwards Mark, Gretchen K. Campbell

Atomtronics is an emerging interdisciplinary field that seeks new functionality by creating devices and circuits where ultra-cold atoms play a role analogous to

Role of Random Electric Fields in Relaxors

February 14, 2014

Author(s)

Daniel P. Phelan, Christopher Stock, Jose Rodriguez Rivera, Songxue Chi, Juscelino Leao, Xifa Long, Yujuan Xie, Alexei A. Bokov, Zuo-Guang Ye, Panchapakesan Ganesh, Peter M. Gehring

Pb(Zr 1¿xTi x)O 3 (PZT) and Pb[(Mg 1/3Nb 2/3) 1¿xTi x]O 3 (PMN-xPT) are complex lead-oxide perovskites that display exceptional piezoelectric properties for

Supercontinuum generation in an on-chip silica waveguide

February 13, 2014

Author(s)

Scott A. Diddams, Dong Yoon Oh, David Sell, Hansuek Lee, Ki Youl Yang, Kerry J. Vahala

Supercontinuum generation is demonstrated in an on-chip silica spiral waveguide by launching 180-fs pulses from an optical parametric oscillator at the center

Metrological challenges introduced by new tolerancing standards

February 13, 2014

Author(s)

Ed Morse, Yue Peng, Vijay Srinivasan, Craig M. Shakarji

The recent release of ISO has provided designers with a richer set of specification tools for the size of part features, so that various functional requirements

Argon mini-arc meets its match: use of a laser-driven plasma source in ultraviolet-detector calibrations

February 12, 2014

Author(s)

Uwe Arp, Robert Vest, Jeanne Houston, Thomas B. Lucatorto

The National Institute of Standards and Technology operates two Spectral Comparator Facilities, which are used to provide detector calibrations from the

Filter Material Effects on Particle Absorption Characteristics

February 10, 2014

Author(s)

Cary Presser, Joseph M. Conny, Ashot Nazarian

The absorption coefficient and mass specific absorption cross section were determined for nigrosin-laden quartz, Teflon, and polycarbonate filters in inert

Ultrafast optical properties of lithographically defined quantum dot amplifiers

February 10, 2014

Author(s)

Luis Miaja Avila, Varun B. Verma, James J. Coleman, Richard P. Mirin, Kevin L. Silverman

We measure the ultrafast optical response of lithographically defined quantum dot amplifiers at 40 K. Recovery of the gain mostly occurs in less than 1

Bloch oscillations collapse and revival of interacting bosons in an optical lattice

February 10, 2014

Author(s)

Khan W. Mahmud, Lei Jiang, Eite Tiesinga, Philip Johnson

We study the dynamics of interacting superfluid bosons in a one dimensional vertical optical lattice after a sudden increase of the lattice potential depth. We

Properties of TiN for Detector and Amplifier Applications

February 8, 2014

Author(s)

Jiansong Gao, Michael R. Vissers, Martin O. Sandberg, Dale Li, Hsiao-Mei Cho, Clint Bockstiegel, Ben Mazin, Henry G. Leduc, Saptarshi Chaudhuri, David P. Pappas, K D. Irwin

We have experimentally explored and carefully characterized the important properties of TiN, including the resistivity, nonlinear kinetic inductance, the

Graphene-on-dielectric micromembrane for optoelectromechanical hybrid devices

February 7, 2014

Author(s)

Jacob M. Taylor, Silvan Schmid, Tolga Bagci, Emil Zeuthen, Patrick Herring, Maja Cassidy, C. M. Marcus, Bartolo Amato, Anja Boisen, Yong C. Shin, Jing Kong, Anders Sorensen, Koji Usami, E.S. Polzik

Due to their exceptional mechanical and optical properties, dielectric silicon nitride (SiN) mi- cromembranes have become the centerpiece of many optomechanical

Compressed-liquid Density Measurements of Three Alternative Turbine Fuels

February 7, 2014

Author(s)

Stephanie L. Outcalt

Compressed-liquid densities of three alternative turbine fuels have been measured. The measurements were made from 270 K to 470 K, and 0.5 MPa to 50 MPa. The

Maximum-likelihood fits to histograms for improved parameter estimation

February 7, 2014

Author(s)

Joseph W. Fowler

Straightforward methods for adapting the familiar χ 2 statistic to histograms of discrete events and other Poisson distributed data generally yield biased

High-accuracy measurement of the black-body radiation frequency shift of the ground-state hyperfine transition in ¹³³Cs

February 7, 2014

Author(s)

Steven R. Jefferts, Thomas P. Heavner, Thomas E. Parker, Jon H. Shirley, Elizabeth A. Donley, Neil Ashby

We report a high-accuracy direct measurement of the blackbody radiation shift (BBR) of 133Cs ground state hyperfine transition. This frequency shift is one of

Analysis of arson fire debris by low temperature dynamic headspace adsorption porous layer open tubular columns

February 7, 2014

Author(s)

Thomas J. Bruno, Tara Lovestead, Jessica Nichols, Megan E. Harries

In this paper we present results of the application of PLOT-cryoadsorption (PLOT-cryo) to the analysis of ignitable liquids in fire debris. We tested ignitable

The Spectrum of Thorium from 250 nm to 5500 nm: Ritz Wavelengths and Optimized Energy Levels

February 6, 2014

Author(s)

Stephen L. Redman, Gillian Nave, Craig J. Sansonetti

We have made precise new observations of the spectrum emitted by a thorium-argon hollow cathode lamp in the region 350 nm to 1175 nm using a high-resolution

International Comparison of a Hydrocarbon Gas Standard at the Picomol per Mol Level

February 6, 2014

Author(s)

George C. Rhoderick, David L. Duewer, Eric Apel, Annarita Baldan, Bradley Hall, Alice Harling, Detlev Helmig, Gwi S. Heo, Jacques Hueber, Mi E. Kim, Yong D. Kim, Benjamin Miller, Stephen Montzka, Daniel Reimer

Studies of climate change increasingly recognize the diverse influences of hydrocarbons in the atmosphere, including roles in particulates and ozone formation

Measuring Material Microstructure under Flow Using 1-2 Plane flow-Small Angle Neutron Scattering

February 6, 2014

Author(s)

Dave Binkley, P. Douglas Godfrin, Norman J. Wagner, Aaron P. R. Eberle, Paul Butler, Lionel Porcar

A new small-angle neutron scattering (SANS) sample environment optimized for studying the microstructure of complex fluids under simple shear flow is presented

Designing High-Performance PbS and PbSe Nanocrystal Electronic Devices through Stepwise, Post-Synthesis, Colloidal Atomic Layer Deposition

February 6, 2014

Author(s)

Soong Ju Oh, Nathaniel E. Berry, Hi-Hyuk Choi, E. A. Gaulding, Hangfei Lin, Taejong Paik, Benjamin T. Diroll, Shinichiro Muramoto, Murray B. Christopher, Cherie R. Kagan

We report a facile, solution based, post synthetic colloidal atomic layer deposition (PS-cALD) process to engineer the surface stoichiometry and therefore

Optical phase noise from atmospheric fluctuations and its impact on optical time-frequency transfer

February 5, 2014

Author(s)

Laura C. Sinclair, Fabrizio R. Giorgetta, William C. Swann, Esther Baumann, Ian R. Coddington, Nathan R. Newbury

The time of flight for a laser beam through the atmosphere will fluctuate as the path-averaged index of refraction varies with atmospheric turbulence, air

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