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Displaying 22176 - 22200 of 73829

Indentation device for in situ Raman spectroscopic and optical studies

December 12, 2012
Author(s)
Yvonne B. Gerbig, Chris A. Michaels, Aaron M. Forster, John W. Hettenhouser, Walter E. Byrd, Dylan J. Morris, Robert F. Cook
Instrumented indentation is a widely used technique to study the mechanical behavior of materials at small length scales and thus has been exploited in particular for metals, ceramics, glasses, and polymers. Mechanical tests of bulk materials, microscopic

Self-aligned multi-channel silicon nanowire field-effect transistors

December 12, 2012
Author(s)
Hao Zhu, Qiliang Li, Hui Yuan, Helmut Baumgart, D. E. Ioannou, Curt A. Richter
Si nanowire field effect transistors (SiNW FETs) with multiple nanowire channels and different gate lengths have been fabricated by using a directed assembly approach combined with standard photolithographic process. The electrical characteristics of SiNW

Silicon Micromachines for Fun and Profit

December 12, 2012
Author(s)
David Bishop, Flavio Pardo, Cris Bolle, Randy Giles, Vladimir Aksyuk
Over the last decade or so a group of us, while working at Bell Labs, have been able to develop a large number of silicon micromachines for a wide range of applications. In this article, which is part of a special volume to celebrate the career of

Structure and Activity of PA5508, a Novel Hexameric Glutamine Synthase Homolog

December 12, 2012
Author(s)
Jane E. Ladner, James F. Parsons
The structure of PA5508 from Pseudomonas aeruginosa, a glutamine synthase (GS) homolog, has been solved at 2.5 Å. Surprisingly, PA5508 forms single hexameric rings rather than the stacked double rings that are characteristic of GS. The C-terminal helical

A Low-Power, High-Sensitivity Micromachined Optical Magnetometer

December 11, 2012
Author(s)
Rahul R. Mhaskar, Svenja A. Knappe, John E. Kitching
We demonstrate a fiber-optically coupled optical magnetometer based on a microfabricated 87Rb vapor cell in a micromachined silicon sensor head. The cell is optically heated with light at 1.5 mm brought to the cell through an optical fiber and absorbed by

Modeling Line Edge Roughness in Templated, Lamellar Block Copolymer Systems

December 11, 2012
Author(s)
Paul N. Patrone, Gregg M. Gallatin
Block copolymers offer an appealing alternative to current lithographic techniques with re- gard to fabrication of next generation microprocessors. However, if copolymers are to be useful on an industrial manufacturing scale, they must meet or exceed

Multi-zone Modeling of Size- Resolved Outdoor Ultrafine Particle Entry into a Test House

December 11, 2012
Author(s)
Dong H. Rim, Andrew K. Persily, Lance L. Wallace, William S. Dols, Steven J. Emmerich
Airborne particle transport into buildings is important for human exposure to particles and associated health effects. The present study investigated the entry of size-resolved outdoor ultrafine particles into a test building under three different

Observation of bias-specific telegraph noise in large transition-edge sensors

December 11, 2012
Author(s)
Vincent Y. Kotsubo, Douglas A. Bennett, Mark Croce, Michael W. Rabin, Daniel R. Schmidt, Joel N. Ullom
We have observed anomalous random telegraph noise in discrete regions of voltage bias throughout the superconducting transition in larger transition-edge sensors (TESs). The bimodal nature of these noise features is consistent with thermally activated

Standard Operating Procedures for Smolder Ignition Testing of Upholstery Fabrics

December 11, 2012
Author(s)
Rick D. Davis, Mauro Zammarano, Szabolcs Matko, Roland H. Kraemer
This manuscript describes a methodology to measure the influence of an upholstery cover fabric to promote smoldering mass loss of a small-scale mock-up. The primary test metric is total mock-up mass loss after 45 min exposure to the smoldering ignition

Dictionary-based Face Recognition from Video

December 10, 2012
Author(s)
P J. Phillips, Yi-Chen Chen, Vishal M. Patel, Rama Chellappa
The main challenge in recognizing faces in video is effec- tively exploiting the multiple frames of a face and the accompanying dynamic signature. One prominent method is based on extracting joint appearance and behavioral features. A second method models

Differentiation and characterization of isotopically modified silver nanoparticles in aqueous media using asymmetric-flow field flow fractionation coupled to optical detection and mass spectrometry

December 10, 2012
Author(s)
Julien C. Gigault, Vincent A. Hackley
The principal objective of this work was to develop and demonstrate a new methodology for silver nanoparticle (AgNP) detection and characterization based on asymmetric-flow field flow fractionation (A4F) coupled to multiple detectors and using stable

Evaluating Real-Time Search over Tweets

December 10, 2012
Author(s)
Ian M. Soboroff, Dean P. McCullough, Jimmy Lin, Craig Macdonald, Iadh Ounis, Richard McCreadie
Twitter offers a phenomenal platform for the social sharing of information. We describe new resources that have been created in the context of the Text Retrieval Conference (TREC) to support the academic study of Twitter as a real-time information source

The Future of National Manufacturing Policy

December 9, 2012
Author(s)
Gregory C. Tassey
Traditional economic growth mechanisms are critiqued to demonstrate long-term inadequacies for addressing the the technological and global competitive complexities challenging U.S. efforts to construct a set of policies that will revive domestic

Low-frequency noise in gallium nitride nanowire mechanical resonators

December 7, 2012
Author(s)
Jason Gray, Kristine A. Bertness, Norman Sanford, Charles T. Rogers
We report on the low-frequency 1/f (flicker) parameter noise displayed by the resonance frequency and resistance of doubly clamped c-axis gallium nitride nanowire (NW) mechanical resonators. The resonators are electrostatically driven and their mechanical

Security Ontologies for Modeling Enterprise Level Risk Assessment

December 7, 2012
Author(s)
Anoop Singhal, Samuel Singapogu
A unified formal knowledge model of information security domain is essential to support a risk management approach. IT Applications are increasingly exposed to a variety of information security threats. Often wrong decisions are made due to insufficient

Self-terminating Growth of Pt by Electrochemical Deposition

December 7, 2012
Author(s)
Yihua Y. Liu, Dincer Gokcen, Ugo Bertocci, Thomas P. Moffat
A self-terminating rapid electrodeposition process for controlled growth of Pt monolayer films from a K_(2)PtCl_(4)-NaCl electrolyte has been developed that is tantamount to wet atomic layer deposition (ALD). Despite the deposition overpotential being in

Superconductivity in Nb-Sn thin films of stoichiometric and off-stoichiometric compositions

December 7, 2012
Author(s)
Matthijs Mentink, John E. Bonevich, Marc Dhalle, Daniel Dietderich, Arno Godeke, Frances Hellman, Herman Ten Kate
Binary Nb-Sn thin film samples are fabricated and characterized in terms of their composition, morphology and superconducting properties. Nb-Sn is magnetron-sputtered onto heated R-plane sapphire substrates at 700 C, 800 C, and 900 C, using a custom-built
Displaying 22176 - 22200 of 73829
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