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Displaying 20176 - 20200 of 73751

Comment on Detection of Microwave Spin Pumping Using the Inverse Spin Hall Effect

January 27, 2014
Author(s)
Thomas J. Silva, Mathias A. Weiler, Hans T. Nembach, Justin M. Shaw
In a recent Letter, Hahn et al. reported on the detection of an ac voltage in a yttrium iron garnet (YIG)/platinum (Pt) bilayer under the condition of parametrically excited resonance. The authors observe an ac voltage at the frequency of the magnetization

Optimal Spread in Network Consensus Models

January 27, 2014
Author(s)
Fern Y. Hunt
Suppose we seek a set of nodes in a network that will enable the fastest spread of information in a decentralized communication environment. If communication resources are limited there are constraints on the number of nodes that can be selected. In this

Phase-slip lines as a resistance mechanism in transition-edge sensors

January 27, 2014
Author(s)
Douglas A. Bennett, Daniel R. Schmidt, Daniel S. Swetz, Joel N. Ullom
The fundamental mechanism of resistance in voltage-biased superconducting films is poorly understood despite its importance as the basis of transition-edge sensors (TESs). TESs are utilized in state-of- the-art microbolometers and microcalorimeters

Si3N4 optomechanical crystals in the resolved-sideband regime

January 27, 2014
Author(s)
Marcelo I. Davanco, Serkan Ates, Yuxiang Liu, Kartik A. Srinivasan
We demonstrate sideband-resolved Si3N4 optomechanical crystals supporting 105 quality factor optical modes at 980 nm, coupled to approximately 4 GHz frequency mechanical modes with quality factors of approximately 3000. Optomechanical electromagnetically

Optical phase-noise dynamics of Titanium:sapphire optical frequency combs

January 24, 2014
Author(s)
Qudsia Quraishi, Scott A. Diddams, Leo W. Hollberg
Stabilized optical frequency combs (OFC) can have remarkable levels of coherence across their broad spectral bandwidth. We study the scaling of the optical noise across hundreds of nanometers of optical spectra. We measure the residual phase noise between

IREX IV: Part 2 Compression Profiles for Iris Image Compression

January 23, 2014
Author(s)
George Quinn, Patrick Grother, Mei Ngan, Nick Rymer
The IREX IV evaluation builds upon IREX III as a performance test of one-to-many iris recognition. This report is the second part of the IREX IV evaluation, which specifically, evaluates the ability of automated iris recognition algorithms to match heavily

Nanoscale mechanics by tomographic contact resonance atomic force microscopy

January 23, 2014
Author(s)
Gheorghe NMN Stan, Santiago Solares, Bede Pittenger, Natalia Erina, Chanmin Su
We report on a quantifiable depth-dependent contact resonance AFM (CR-AFM) measurements over polystyrene-polypropylene (PS-PP) polymer blends to detail surface and sub-surface features in terms of elastic modulus and mechanical dissipation. The depth

Optimally Focused Cold Atom Systems Obtained Using Density-Density Correlations

January 23, 2014
Author(s)
Ian B. Spielman, Andika Putra, Daniel Campbell, Ryan Price, Subhadeep De
Resonant absorption imaging is a common technique for detecting the two-dimensional column density of ultracold atom systems. In many cases, the system’s thickness along the imaging direction greatly exceeds the imaging system’s depth of field, making the

Review of Past Performance and Further Development of Modeling Techniques for Collapse Assessment of Existing Reinforced Concrete Buildings

January 23, 2014
Author(s)
Kenneth Elwood, Jack Baker, Craig Comartin, William Holmes, Jack Moehle, Peter Somers
The first phase of work of the Program Plan, documented in this report, included the identification of critical deficiencies, refinement of the list of common deficiencies, and development of collapse mitigation strategies for older reinforced concrete

Adaptive Composite B-Spline Grid Generation for Interactive 3D Visualizations

January 22, 2014
Author(s)
Bonita V. Saunders, Qiming Wang, Brian Antonishek
We describe an adaptive grid generation technique based on the composition of tensor product B-spline mappings, T and Phi, where Phi maps the unit square onto itself and T maps the unit square onto the desired physical domain. Variational methods are used

NIST 1-kilonewton sine force calibration system

January 22, 2014
Author(s)
Akobuije D. Chijioke, Ricky L. Seifarth, Zeina J. Kubarych
Many force-measurement applications are of a dynamic nature, and in recent decades there has been much progress in demonstrating and developing dynamic calibration systems for force transducers. The National Institute of Standards and Technology (NIST), U

Ghost Modes and Continuum Scattering in the Dimerized Distorted Kagome Lattice Antiferromagnet Rb 2 Cu 3 SnF 12

January 21, 2014
Author(s)
K. Matan, Y. Nambu, Yang Zhao, T.J. Sato, Y. Fukumoto, T. Ono, H. Tanaka, Collin L. Broholm, A. Podlesnyak, G. Ehlers
Magnetic excitations of the pinwheel valence bond solid state in the distorted kagome lattice antiferromagnet Rb 2Cu 3SnF 12 were studied using high-resolution inelastic neutron scattering. A weakly dispersive mode around 5 meV and duplicate triplet

Isolation of Specific Small Diameter Single-Wall Carbon Nanotube Species via Aqueous Two-Phase Extraction

January 21, 2014
Author(s)
Jeffrey A. Fagan, Constantine Y. Khripin, Carlos A. Silvera Batista, Jeffrey R. Simpson, Angela R. Hight Walker, Ming Zheng
Aqueous two-phase extraction (ATPE) is demonstrated to enable isolation of multiple semiconducting and metallic single-wall carbon nanotube species from a small diameter synthetic mixture. Separation by ATPE is rapid and robust, with remarkable tunability

Saponins: A sustainable surfactant. From its microwave-assisted extraction to the synthesis of monodisperse latices

January 21, 2014
Author(s)
Charlene Schnitt, Bruno Grassl, Julien C. Gigault, Vincent A. Hackley, Gaetane Lespes, Jacques Desbrieres, Virginie Pellerin, Stephanie Reynaud
Synthetic surfactants are widely used in emulsion polymerization, but it is increasingly desirable to replace them with naturally derived molecules with a reduced environmental burden. This study demonstrates the use of saponins as sustainable and

Measurement Techniques for RF Nanoelectronics

January 20, 2014
Author(s)
Thomas M. Wallis, Luca Pierantoni
In 1882, in a lecture at the University of Leiden, Nobel prize-winner Heike Kammerlingh Onnes coined the motto: “Through Measurement to Knowledge” [1]. In that same lecture, he gave many historical examples of how measurements have fostered insight

Quantification of total serum transferrin and transferrin sialoforms in human serum; an alternative method for the determination of carbohydrate-deficient transferrin in clinical samples

January 20, 2014
Author(s)
Yoana Y. Nuevo Ordonez, William C. Davis, Raymond F. Anton
Carbohydrate deficient transferrin (CDT) measurements in human serum constitute the most specific marker for chronic heavy alcohol use and congenital disorders of glycosylation in proteins. Therefore, the development of precise and accurate analytical

SPRITE: A modernized approach to scanning probe contact resonance imaging

January 20, 2014
Author(s)
Anthony B. Kos, Jason P. Killgore, Donna C. Hurley
We describe a system for contact resonance tracking called Scanning Probe Resonance Image Tracking Electronics (SPRITE). SPRITE can image two contact resonance frequencies simultaneously and thus can be used to acquire quantitative mechanical properties

Possibilities and Tradeoffs for Low-GWP Refrigerants

January 19, 2014
Author(s)
Mark O. McLinden
presentation at ASHRAE Winter Conference: We explore the possibilities for refrigerants having low global warming potential (GWP) through two distinct, but complementary, approaches. In an “exploration of thermodynamic space” we define the limits of what

Thermodynamic Performance Limits of the Vapor Compression Cycle

January 19, 2014
Author(s)
Piotr A. Domanski, J S. Brown, Jae H. Heo, Mark O. McLinden
This presentation discusses the thermodynamic performance limits of the vapor compression cycle. We have applied evolutionary algorithms to explore the performance of hypothetical refrigerants defined by the thermodynamic parameters used by the extended
Displaying 20176 - 20200 of 73751
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