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Journals

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...

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...

Measuring the sulfur content and corrosivity of North American petroleum with the advanced distillation curve method

February 5, 2014

Author(s)

Peter Y. Hsieh, Thomas J. Bruno

Petroleum is a complex fluid whose sulfur content varies considerably depending on its place of origin. Sour crude petroleum, which contains more than 0.5 %...

Structure and X-ray Reference diffraction patterns of (Ba6-xSrx)R2Co4O15 (x=1, 2) (R=Lanthanides)

February 4, 2014

Author(s)

Winnie K. Wong-Ng, Guangyao Liu, Yonggao Y. Yan, James A. Kaduk

The structure and X-ray patterns of two series of barium lanthanide cobaltites, namely, Ba4Sr2R2Co4O15 (R=La, Nd, Sm, Eu, Gd, Dy), and Ba5SrR2Co4O15 (R= La, Nd...

CPTAC Studies 1 and 5: dissecting variability in multi-site LC-MS/MS proteomics through quality metrics and robust hierarchical multivariate statistics

February 4, 2014

Author(s)

Stephen E. Stein, David M. Bunk, Xia Wang, Matthew Chambers, Lorenzo J. Vega-Montoto, David L. Tabb

Shotgun proteomics experiments integrate a complex sequence of processes, any of which can introduce variability. Quality metrics computed from LC-MS/MS data...

Order by Disorder Spin Wave Gap in the XY Pyrochlore Magnet Er₂Ti₂O₇

February 4, 2014

Author(s)

Kathryn Aileen Ross, Yiming Qiu, John R. Copley, H. A. Dabkowska, B. D. Gaulin

The recent determination of a robust spin Hamiltonian for the anti-ferromagnetic XY pyrochlore Er 2Ti 2O 7 reveals a most convincing case of the ¿order by...

Third-order antibunching from an imperfect single-photon source

February 4, 2014

Author(s)

Martin J. Stevens, Scott C. Glancy, Sae Woo Nam, Richard P. Mirin

We measure second- and third-order temporal coherences, g (2)(τ) and g (3)(τ1, τ2), of an optically excited single-photon source: an InGaAs quantum dot in a...

Composite Floor Systems under Column Loss: Collapse Resistance and Tie Force Requirements

February 4, 2014

Author(s)

Joseph Main

This paper presents a computational assessment of the performance of steel gravity framing systems with single-plate shear connections and composite floor slabs...

A four-pixel single-photon pulse-position array fabricated from WSi superconducting nanowire single- photon detectors

February 3, 2014

Author(s)

Varun B. Verma, Robert D. Horansky, Francesco Marsili, Jeffrey Stern, Matthew Shaw, Adriana E. Lita, Richard P. Mirin, Sae Woo Nam

We demonstrate a scalable readout scheme for an infrared single-photon pulse-position camera consisting of WSi superconducting nanowire single-photon detectors...

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