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Displaying 16426 - 16450 of 74035

A Unifying Framework to Quantify the Effects of Boundary Stiffness, Polymer-Substrate Interactions and Substrate Roughness on the Dynamics of Thin Supported Polymer Films

June 21, 2015
Author(s)
Jack F. Douglas, Paul Hanakata, Francis W. Starr, Beatriz Betancourt
Changes in the dynamics of supported polymer films in comparison to bulk materials involve a complex convolution of effects, such as boundary thermodynamic interactions, boundary roughness and compliance, in addition to finite film thickness. We consider

Characterization of Electrothermal Actuation with Nanometer and Microradian Precision

June 21, 2015
Author(s)
Craig R. Copeland, Craig D. McGray, Jon C. Geist, Vladimir A. Aksyuk, Samuel M. Stavis
A recently introduced particle-tracking method was used to measure the single motion cycles of an electrothermal actuator with nanometer and microradian precision. Driving the actuator with a low-noise input induced deterministic motion that was perfectly

Self Assembly of Magnetic Nanoparticles at Silicon Surfaces

June 21, 2015
Author(s)
Katharina Theis-Brohl, Philipp Gutfreund, Alexei Vorobiev, Max Wolff, Boris P. Toperverg, Joseph Dura, Julie Borchers
Neutron reflectometry was used to study the assembly of magnetite nanoparticles in a water-based ferrofluid close to a silicon surface, Under three conditions, static, under shear and with a magnetic field, the depth profile is extracted. The particles

Small footprint nano-mechanical plasmonic phase modulators

June 21, 2015
Author(s)
Vladimir A. Aksyuk, Brian S. Dennis, Michael Haftel, David Czaplewski, Daniel Lopez, Girsh Blumberg
The authors’ recent Nature Photonics article titled “Compact Nano-Mechanical Plasmonic Phase Modulators” [1] is reviewed which reports a new phase modulation principle with experimental demonstration of a 23 μm long non-resonant modulator having 1.5 π rad

Histone H3 Ser57 and Thr58 Phosphorylation in 5XFAD Mouse Brain

June 20, 2015
Author(s)
Kyle W. Anderson, Illarion V. Turko, Natalia Mast, Irina A. Pikuleva
Alzheimer’s disease (AD) is the most common neurodegenerative disorder, yet it is poorly understood. Currently, there is no treatment to delay onset or slow progression of AD. Epigenetics of AD is a growing field that has gained interest due to the

CALIBRATION AND CHARACTERIZATION OF A SEAPRISM RADIOMETER FOR AERONET-OC

June 19, 2015
Author(s)
Bettye C. Johnson, Steven W. Brown, John T. Woodward IV, Keith R. Lykke, Giuseppe Zibordi
The global Aerosol Robotic Network for Ocean Color (AERONET-OC) program utilizes AERONET CE-318 sun photometers (termed “SeaPRISMs”) modified for in-air observations of ocean waters situated on oil drilling rigs, off-shore lighthouses, or other platforms

Flexible metal-organic framework compounds: In situ studies for selective CO2 capture

June 19, 2015
Author(s)
Andrew J. Allen, Laura Espinal, Winnie K. Wong-Ng, Wendy Queen, Craig Brown, Steven R. Kline, Kristi L. Kauffman, Jeffrey T. Culp
Results from in situ experiments are presented to correlate carbon capture with dynamic structural changes in two flexible metal-organic framework (MOF) materials: porous coordination polymers (PCPs) exhibiting promising carbon dioxide adsorption

Single to Multiquasiparticle Excitations in the Itinerant Helical Magnet CeRhIn 5

June 19, 2015
Author(s)
C. Stock, Jose Rodriguez Rivera, Karin Schmalzl, E. E. Rodriguez, A. Stunault, C. Petrovic
CeRhIn 5 is an itinerant magnet where the Ce 3+ spins order in a simple spiral phase caused by competing exchange interactions. We investigate the spin excitations and observe sharp spin- waves parameterized by a nearest neighbor exchange J RKKY =0.88 ±0

Towards a “Periodic Table” of Bugs

June 19, 2015
Author(s)
Paul E. Black, Irena V. Bojanova, Yaacov Yesha, Yan Wu
High-confidence systems must not be vulnerable to attacks that reduce the security, reliability, or availability of the system as a whole. One collection of vulnerabilities is the Common Weakness Enumeration (CWE). It represents a considerable community

Cardholder Authentication for the PIV Digital Signature Key

June 18, 2015
Author(s)
William Polk, Hildegard Ferraiolo, David Cooper
FIPS 201-2 requires explicit user action by the Personal Identity Verification (PIV) cardholder as a condition for use of the digital signature key stored on the card. This document clarifies the requirement for explicit user action to encourage the

Gauge matters: Observing the vortex-nucleation transition in a Bose condensate

June 18, 2015
Author(s)
Ian B. Spielman, LeBlanc Lindsey, Karina Jimenez-Garcia, Ross Williams, Matthew Beeler, William D. Phillips
The order parameter of a quantum-coherent many-body system includes one or more phase degrees of freedom, which, owing to the phase information's relationship to velocity, can be accessed using time-of-flight (TOF) imaging. Here, trapped Bose-Einstein

Mesomorphic Pathway in Early Stage Crystallization of Polyethylene

June 18, 2015
Author(s)
Kalman D. Migler, Angela R. Hight Walker, Anthony P. Kotula
The kinetic pathway by which a molten polymer transforms into a multi-length scale semi-crystalline structure upon cooling is an unsolved problem in polymer physics, yet it is critical to the processing, properties and ultimate performance of these

Direct Measurement of Trace Polycyclic Aromatic Hydrocarbons in Diesel Fuel with 1H and 13C NMR Spectroscopy: Effect of PAH Content on Fuel Lubricity

June 17, 2015
Author(s)
Peter Y. Hsieh, Jason A. Widegren, Andrew Slifka, Andrew J. Hagen, Ronald A. Rorrer
Surface-active trace compounds present in diesel fuels protect pumps and injectors against premature wear through boundary lubrication. Due to the vast number of hydrocarbon compounds found in petroleum distillate fuels, it is difficult to measure the

Economic impact of applying high strength steels in hydrogen gas pipelines

June 17, 2015
Author(s)
Jeffrey W. Sowards, James R. Fekete, Robert L. Amaro
Pipeline steel will likely be employed extensively to transport gaseous hydrogen in support of a future clean energy economy. To date, a hydrogen-specific cost analysis of pipeline installation has not been produced. This paper performs several cost
Displaying 16426 - 16450 of 74035