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Journals

Two-photon microwave transitions and strong-field effects in a room-temperature Rydberg-atom gas

October 29, 2014

Author(s)

Christopher L. Holloway, Joshua A. Gordon

We investigate two-photon transitions and strong-field effects on Rydberg atoms using Autler- Townes splitting of electromagnetically-induced transparency...

Frequency-Comb-Based Remote Sensing of Greenhouse Gases over Kilometer Air Paths

October 29, 2014

Author(s)

Greg B. Rieker, Fabrizio R. Giorgetta, William C. Swann, Jonathan Kofler, Alexander M. Zolot, Laura C. Sinclair, Esther Baumann, Christopher L. Cromer, G. Petron, Colm Sweeney, P P. Tans, Ian R. Coddington, Nathan R. Newbury

We demonstrate frequency comb tooth-by-tooth measurements of atmospheric gas absorption across a 2-km, turbulent, open-air path through coherent dual-comb...

Influence of Sidechain Regiochemistry on the Transistor Performance of High Mobility All Donor Polymers

October 29, 2014

Author(s)

Zhuping Fei, Pichaya Pattanasattayavong, Yang Han, Feng Yan, Regis J. Kline, Thomas D. Anthopoulos, Martin Heeney

Optimal Deployment of Pico Base Stations in LTE-Advanced Heterogeneous Networks

October 29, 2014

Author(s)

Sungseob Lee, SuKyoung Lee, Kim KyungSoo, David W. Griffith, Nada T. Golmie

As data traffic demand in cellular networks grows exponentially, operators need to add new cell sites to keep up; unfortunately, it is costly to build and...

Carbon Monoxide Exposure from Portable Generators

October 28, 2014

Author(s)

Steven J. Emmerich, Andrew K. Persily, Liangzhu Wang

Serious concerns exist about the hazard of acute residential carbon monoxide (CO) exposures from portable gasoline-powered generators, which can result in death...

Universal and non-universal effective N-body interactions for ultracold harmonically-trapped few-atom systems

October 28, 2014

Author(s)

X. Y. Yin, D Blume, Philip Johnson, Eite Tiesinga

We derive the ground-state energy for a small number of ultracold atoms in an isotropic harmonic trap using effective quantum field theory (EFT). Atoms are...

Nanoscale Structural Heterogeneity in Ni-rich Half-Heusler TiNiSn

October 28, 2014

Author(s)

Jason E. Douglas, Philip A. Chater, Craig Brown, Tresa M. Pollock, Ram Seshadri

The structural implications of excess Ni in the TiNiSn half-Heusler compound are examined through a combination of synchrotron x-ray and neutron scattering...

Extended and Revised Analysis of Singly Ionized Tin: Sn II

October 28, 2014

Author(s)

K. Haris, Alexander Kramida, A. Tauheed

The electronic structure of singly ionized tin (Sn II) is partly a one-electron and partly a three-electron system with ground configuration 5s25p. The excited...

Nanoparticle size determination using optical microscopes

October 27, 2014

Author(s)

Ravikiran Attota, Richard Kasica, Premsagar P. Kavuri, Hyeong G. Kang, Lei Chen

We present a simple method for size determination of nanoparticles using conventional optical microscopes. The method, called through-focus scanning optical...

The Leucine-Rich Amelogenin Peptide (LRAP) is a Partially Structured Monomer in Solution

October 25, 2014

Author(s)

Barbara J. Tarasevich, John S. Philo, Nasib Karl Mulof, Susan T. Krueger, Garry W. Buchko, Genyao Lin, Wendy J. Shaw

Amelogenin proteins are critical to the formation of enamel in teeth and may have roles in promoting nucleation, controlling growth, and regulating...

Path degeneracy and EXAFS analysis of disordered materials

October 24, 2014

Author(s)

Bruce D. Ravel

The analysis of EXAFS data measured on a material with a disordered local configuration environment around the absorbing atom can be challenging due to the...

Structure and Stability of Phospholipid Bilayers Hydrated by a Room-Temperature Ionic Liquid/Water Solution: a Neutron Reflectometry Study

October 23, 2014

Author(s)

Antonio Benedetto, Frank Heinrich, Miguel A. Gonzalez, Giovanna Fragneto, Erik Watkins, Pietro Ballone

Neutron reflectometry measurements (NR) have been carried out to probe the structure and stability of two model bio-membranes consisting of POPC and DMPC...

Magnetoencephalography of Epilepsy with a Microfabricated Atomic Magnetrode

October 22, 2014

Author(s)

Svenja A. Knappe, Orang Alem, Alex M. Benison, Daniel S. Barth, John E. Kitching

We measured the magnetic signature of epileptiform discharges with high signal-to-noise ratio, using microfabricated atomic magnetometers based on laser...

Prediction and Validation of Diffusion Coefficients in a Model Drug Delivery System Using Microsecond Atomistic Molecular Dynamics Simulation and Vapor Sorption Analysis

October 21, 2014

Author(s)

Christopher Forrey, D M. Saylor, Joshua S. Silverstein, Jack F. Douglas, Eric Davis, Yossef A. Elabd

Diffusion of small to medium sized molecules in polymeric medical device materials underlies a broad range of public health concerns related to unintended...

Beating the standard quantum limit for force sensing with coupled two-mode optomechanical system

October 21, 2014

Author(s)

Xunnong Xu, Jacob Taylor

Optomechanics provides a method to transduce weak forces to optical fields, with many e↵orts approach the standard quantum limit. We consider force sensing...

Comparison of the performance of different models for the interpretation of low level mixed DNA profiles

October 21, 2014

Author(s)

Michael D. Coble, Todd Bille, Steven Weitz, John Buckleton, Jo Bright

DNA analyses from casework samples commonly result in complex DNA profiles. Often, these profiles consist of multiple contributors and display multiple...

Tunable Cobalt Vacancies and Related Properties in LaCo_xAs₂

October 21, 2014

Author(s)

Shijie Shen, Gang Wang, Shifeng Jin, Qingzhen Huang, Tianping Ying, Dandan Li, Xiaofang Lai, Tingting Zhou, Han Zhang, Zhiping Lin, Xiaozhi Wu, Xiaolong Chen

The origin of transition metal vacancies and their effects on the properties of ThCr 2Si 2-type compounds have been less studied and poorly understood. Here we...

Fast, high-fidelity, all-optical and dynamically-controlled polarization gate using room-temperature atomic vapor

October 21, 2014

Author(s)

Runbing Li, Chengjie Zhu, Lu Deng, Edward W. Hagley

We demonstrate a fast, all-optical polarization gate in a room-temperature atomic medium. Using a Polarization-Selective-Kerr-Phase-Shift (PSKPS) technique, we...

Development and Applications of Non-destructive Screening Tools for Thermoelectric Materials at NIST

October 20, 2014

Author(s)

Winnie K. Wong-Ng, Yonggao Y. Yan, Joshua B. Martin, Makoto Otani, Evans L. Thomas, Xinfeng Tang, Martin L. Green

The increased research and development of thermoelectric materials for energy conversion applications is driven primarily by the need for improved efficiency in...

Structural Model of an mRNA in Complex with the Bacterial Chaperone Hfq

October 20, 2014

Author(s)

Yi Peng, Joseph E. Curtis, Xianyang Fang, Sarah A. Woodson

Small non-coding (s)RNAs and their chaperone protein Hfq regulate bacterial gene expression in response to stress and other environmental signals. Hfq binds...

Porous Metal-Organic Frameworks for Gas Storage and Separation: What, How and Why?

October 20, 2014

Author(s)

Bin Li, Hui-Min Wen, Wei Zhou, Banglin Chen

Metal-organic frameworks (MOFs) have been emerging as promising multifunctional materials, and shown particularly useful applications for gas storage and...

Nucleation of Graphene and Its Conversion to Single Walled Carbon Nanotube

October 20, 2014

Author(s)

Matthieu C. Picher, Pin A. Lin, Gomez-Ballesteros L. Jose, Perla Balbuena, Renu Sharma

Nucleation is a critical stage for controlling the molecular building blocks into desired functional crystalline structures. For example, chirality of a single...

Structure of Flocs of Latex Particles Formed by Addition of Protein from Moringa Seeds

October 20, 2014

Author(s)

Maja S. Hellsing, Habauka M. Kwaambwa, Fiona M. Nermark, Bonang B. M. Nkoane, Andrew J. Jackson, Matthew John Wasbrough, Ida Berts, Lionel Porcar, Adrian R. Rennie

Proteins extracted from the seeds of Moringa trees are effective flocculents for particles dispersed in water and they are attractive as a natural and...

Streamlining the Additive Manufacturing Digital Spectrum: A Systems Approach

October 18, 2014

Author(s)

Duck B. Kim, Paul Witherell, Robert R. Lipman, Shaw C. Feng

Additive Manufacturing (AM) provides great potential for industrial manufacturers who require low volume and functional, highly complex end use products. Given...

Avoiding Catastrophes in Cyberspace through Smarter Testing: How to prevent Heartbleed-like disasters using readily available testing technologies

October 16, 2014

Author(s)

Apostol T. Vassilev, Christopher Celi

The recently discovered Heartbleed bug in OpenSSLs implementation of Internet security protocols and the aftermath from dealing with its consequences...

A geometric description of nonreciprocity in coupled two-mode systems

October 16, 2014

Author(s)

Leonardo M. Ranzani, Jose A. Aumentado

We explore the concept of nonreciprocity in coupled two-mode systems using a geometric mapping to the Poincaré sphere. From this perspective, we recast the...

Mechanical property changes in porous low-k dielectric thin films during processing

October 15, 2014

Author(s)

Gheorghe Stan, Richard S. Gates, Premsagar P. Kavuri, Jessica Torres, David Michalak, Canay Ege, Jeff Bielefeld, Sean W. King

The design of future generations of Cu-low-k dielectric interconnects with reduced electronic crosstalk often requires engineering materials with an optimal...

Modeling RP-1 fuel advanced distillation data using comprehensive two-dimensional gas chromatography coupled with time-of-flight mass spectrometry and partial least squares analysis

October 15, 2014

Author(s)

Thomas J. Bruno, Benjamin Kehimkar, Brendon Parsons, Jamin C. Hoggard, M. C. Billingsley, R. E. Synovec

Recent efforts in predicting rocket propulsion (RP-1) fuel performance through modeling put greater emphasis on obtaining detailed and accurate fuel properties...

Faceting Control in Core/Shell GaN micropillars using Selective Epitaxy

October 15, 2014

Author(s)

Sergiy Krylyuk, Heayoung Yoon, Baomei Wen, Abhishek Motayed, Albert Davydov, Matt N. King

We report on fabricating large-area, vertically aligned GaN epitaxial core-shell micropillar arrays. The two-step process consisted of inductively coupled...

gamma-prime Phase Stability and Phase Equilibrium in Ternary Co-W-Al at 900 °C

October 15, 2014

Author(s)

Eric Lass, Maureen E. Williams, Carelyn E. Campbell, Kil-Won Moon, Ursula R. Kattner

Phase equilibria at 900 °C in the Co-rich Co-W-Al ternary system is investigated through isothermal annealing of six alloy compositions for times up to 8000 h...

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