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Journals

Verification of the Back-EMF Method for Piston Velocity Measurements

July 10, 2012

Author(s)

Ray Radebaugh, Michael A. Lewis, Peter E. Bradley

Linear compressors are used to drive pulse tube or Stirling cryocoolers, and they can be used as expanders in place of inertance tubes when inertance tubes...

Continuous-variable quantum compressed sensing

July 9, 2012

Author(s)

Yi-Kai Liu, Matthias Ohliger, Vincent Nesme, David Gross, Jens Eisert

We introduce a novel method to faithfully reconstruct unknown quantum states that are approximately low-rank, using only a few measurement settings. The method...

High Resolution THz Optical Absorption Study of Antiferromagnetic Magnons in Hematite (alpha-Fe2O3)

July 9, 2012

Author(s)

Shin G. Chou, David F. Plusquellic, Paul E. Stutzman, Shuangzhen S. Wang, Edward J. Garboczi

We report the high resolution optical measurement for the temperature dependence of the antiferromagnetic resonance (AFMR) transition in alpha-Fe2O3 between (0...

Biodiesel Fuels from Supercritical Fluid Processing: Quality Evaluation with the Advanced Distillation Curve Method and Cetane Numbers

July 9, 2012

Author(s)

Thomas J. Bruno, George G. Anitescu, Lawrence L. Tavlarides

To develop efficient reactor and plant designs to optimize the process of biofuel production, thermophysical and chemical properties of various reactive...

Biodiesel Fuels from Supercritical Fluid Processing: Quality Evaluation with the Advanced Distillation Curve Method and Cetane Numbers

July 9, 2012

Author(s)

George G. Anitescu, Thomas J. Bruno

The volatility of biodiesel fuel samples produced by supercritical (SC) transesterification (TE) of triglyceride feedstocks of chicken fat and soybean oil was...

Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect

July 9, 2012

Author(s)

Soo-Man Seo, Kyoung-Whan Kim, Jisu Ryu, Hyun-Woo Lee, Kyung Jin Lee

We study theoretically current-induced dynamics of a transverse magnetic domain wall in bi-layer nanowires consisting of a ferromagnet on top of a nonmagnet...

Identification of Isethionic Acid and Other Small Molecule Metabolites of Fragilariopsis cylindrus with Nuclear Magnetic Resonance

July 8, 2012

Author(s)

Dan Bearden, Arezue F. Boroujerdi, Peter A. Lee, Giacomo R. DiTullio, Michael G. Janech, Sarah B. Vied

Nuclear magnetic resonance (NMR)-spectroscopy has been used to obtain metabolic profiles of the polar diatom Fragilariopsis cylindrus, leading to the...

Estimating Far-Field Errors Due to Mechanical Errors in Spherical Near-Field Scanning*

July 8, 2012

Author(s)

Michael H. Francis

When the mechanical requirements are established for a spherical near-field scanner, it is desirable to estimate what effects the expected mechanical errors...

Estimating Far-Field Errors Due to Mechanical Errors in Spherical Near-Field Scanning

July 8, 2012

Author(s)

Michael H. Francis

When the mechanical requirements are established for a spherical near-field scanner, it is desirable to estimate what effects the expected mechanical errors...

The winter time South Pole tropospheric water vapor column: Comparisons of radiosonde and recent terahertz radiometry, use of the saturated column as a proxy measurement; and inference of decadal trends

July 7, 2012

Author(s)

Richard A. Chamberlin, Erich N. Grossman

We use a fifty year record of winter time radiosonde observations at the South Pole to estimate the precipitable water vapor column (PWV) over the entire period...

Composites Failure Criteria, Uncertainty Propagation, and Estimation of the A-Basis and B-Basis Design Allowables

July 7, 2012

Author(s)

Jeffrey T. Fong, Nathanael A. Heckert, James J. Filliben

In a 2002 paper on a summary of the so-called World-Wide Failure Exercise by Hinton, Kaddour, and Soden (Composites Science and Technology, 62: 1725-1797), in...

Proposed Standardization Effort: Digital-Image Correlation for Mechanical Testing

July 6, 2012

Author(s)

David T. Read, Yi-Wen Cheng, M A. Sutton

We propose a standardization effort on digital-image correlation, to collect and document the available methods for assessing image quality, for analyzing the...

The Size and Mass Distribution of Firebrands collected from Ignited Building Components Exposed to Wind

July 6, 2012

Author(s)

Sayaka S. Suzuki, Samuel Manzello, Yoshihiko Hayashi

Wildfires that spread into communities, commonly referred to as Wildland-Urban Interface Fires (WUI), are a significant international problem. Post-fire damage...

Alternative Analyses of Measurements of the Planck Constant

July 5, 2012

Author(s)

Blaza Toman

We compare different methods for the adjustment of the Planck constant using recent, inconsistent data. First we discuss the popular Birge ratio method. By...

Propagation of Vortex Electron Wave Functions in a Magnetic Field

July 5, 2012

Author(s)

Gregg M. Gallatin, Benjamin McMorran

The physics of coherent beams of photons carrying axial orbital angular momentum (OAM) is well understood and such beams, sometimes known as vortex beams, have...

Viscoelastic and poroelastic relaxations of polymer-loaded hydrogels

July 5, 2012

Author(s)

Blessing Deeyaa, Christopher Stafford, Edwin Chan, Peter M. Johnson

In this work, we study the viscoelastic and poroelastic contributions on the relaxation behavior of a polymer-loaded hydrogel using a recently develop...

First-principles studies of the atomic, electronic and magnetic structure of alpha-MnO2 (cryptomelane)

July 4, 2012

Author(s)

Eric Cockayne, Lan (. Li

First-principles density functional theory calculations are used to investigate alpha-MnO2, a structure containing a framework of corner and edge sharing MnO6...

Neurite Outgrowth Inhibition by Lithium Chloride in Differentiating Progenitor Cell Cultures

July 4, 2012

Author(s)

Kavita M. Jeerage, Tammy L. Oreskovic

Neuron-specific in vitro screening strategies have the potential to accelerate the evaluation of chemicals or nanomaterials for neurotoxicity. We examined the...

Observation of a superfluid Hall effect

July 3, 2012

Author(s)

Lindsay J. LeBlanc, Karina K. Jimenez Garcia, Ross A. Williams, Matthew C. Beeler, Abigail R. Perry, William D. Phillips, Ian B. Spielman

Measurement techniques based upon the Hall effect are essential tools in condensed matter physics. Here, we report the first observation of a Hall effect in an...

From Antiferromagnetic Insulator to Correlated Metal in Pressurized and Doped LaMnPo

July 3, 2012

Author(s)

J.W. Simonson, Z. P. Yin, M. Pezzoli, J. Guo, J. Liu, K. Post, A. Efimenko, N. Hollmann, Z. Hu, H.-J. Lin, C.-T. Chen, C. Marques, V. Leyva, G. Smith, Jeffrey W. Lynn, L. L. Sun, G. Kotliar, D.N. Basov, L.H. Tjeng, M.C. Aronson

More Durable or Vulnerable? --- Effect of Nanoparticles on Long-Term Performance of Polymeric Nanocomposites during UV Exposure

July 2, 2012

Author(s)

Xiaohong Gu, Minhua Zhao, Stephanie S. Watson, Tinh Nguyen, Joannie W. Chin, Jonathan W. Martin, Dongmei Zhe, Guodong Chen

Polymers are widely used as exterior coatings in buildings, bridges, aircrafts, and automobiles for both protection and aesthetic purposes. However, the...

Pigment and Nanofiller Photoreactivity Database

July 2, 2012

Author(s)

Stephanie S. Watson, I-Hsiang Tseng, Tarek Marray, Bastien T. Pellegrin

The service life and durability of nanocomposites that contain fillers are affected by photocatalytic properties of these fillers, particularly narrow band gap...

Kinetics of H atom attack on unsaturated hydrocarbons using spectral uncertainty propagation and minimization techniques

July 2, 2012

Author(s)

David A. Sheen, Claudette M. Rosado-Reyes, Wing Tsang

Unsaturated hydrocarbons are an important component of hydrocarbon fuels and intermediates in their oxidation. Under rich conditions, H atom attack is one of...

100 Years of Superconductivity

July 2, 2012

Author(s)

Richard L. Kautz

The 100th anniversary of the discovery of superconudctivity by Heike Kamerlingh Onnes was celebrated in 2011 at the Superconductivity Centennial Conference held...

In-situ Polarized 3He system for the Magnetism Reflectometer at the Spallation Neutron Source

July 2, 2012

Author(s)

Thomas R. Gentile, X Tong, C Y. Jiang, V Lauter, H. Ambaye, D. Brown, L Crow, R J. Goyette, W-T Lee, A. Parizzi

We report on the in-situ polarized 3He neutron polarization analyzer developed for the time-of-flight Magnetism Reflectometer (MAGICS) at the Spallation Neutron...

Large Eddy Simulation of Wind Loads on a Low-Rise Structure and Comparison with Wind Tunnel Results

July 2, 2012

Author(s)

isam janajreh, Emil Simiu

This work presents estimates of time histories of pressure coefficients at several taps on the roof of a 1/200 model of a 200 x 100 x 20 ft low-rise building...

The role of probe shape on the initiation of metal plasticity in nanoindentation

July 1, 2012

Author(s)

Li Ma, Dylan Morris, Stefhanni Jennerjohn, David Bahr, Lyle E. Levine

The dislocation nucleation stress of crystalline materials is frequently estimated from the maximum shear stress assuming Hertzian contact up to the first pop...

Small-Angle Scattering from Branched Polymers

July 1, 2012

Author(s)

Boualem Hammouda

The single-polymer form factor is worked out for branched polynmers using a scaling argument in order to recover the low-Q Porod exponent characterisitc of the...

Electromagnetic Properties of Iron Oxide Corrosion Product Powders at Radio Frequencies

July 1, 2012

Author(s)

Sung Kim, Jack T. Surek, James R. Baker-Jarvis, Virgil Provenzano

We calculated the refractive index from Sparameter data for corrosion samples tested in waveguide from 12.4 GHz to 110 GHz. This approach minimizes the modal...

A Verification Method for Noise-Temperature Measurements on Cryogenic Low-Noise Amplifiers

July 1, 2012

Author(s)

Dazhen Gu, James P. Randa, Robert L. Billinger, Dave K. Walker

We report a verification method for noise-temperature(NT) measurements on cryogenic low-noise amplifiers (LNAs) at liquid helium temperature. The method uses a...

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