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Search Publications

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Displaying 21476 - 21500 of 73697

Sustainability through Lifecycle Synthesis of Material Information

April 19, 2013
Author(s)
Paul W. Witherell, Katherine C. Morris, Anantha Narayanan Narayanan, Jae H. Lee, Sudarsan Rachuri
The synthesis of material information across lifecycle stages will lay the foundation for a material information model to support sustainable decision making. This paper explores how material information is represented in select standards that address

A Sensor Ontology Literature Review

April 18, 2013
Author(s)
Roger D. Eastman, Craig I. Schlenoff, Stephen B. Balakirsky, Tsai H. Hong
The purpose of this paper is to review existing sensor and sensor network ontologies to understand whether they can be reused as a basis for a manufacturing sensor ontology, or if the existing ontologies hold lessons for the development of a new ontology

Assessing Ranging Errors as a Function of Azimuth in Laser Trackers and Tracers

April 18, 2013
Author(s)
Balasubramanian Muralikrishnan, Vincent D. Lee, Christopher J. Blackburn, Daniel S. Sawyer, Steven D. Phillips, Wei Ren, Ben Hughes
Tilt and radial error motion of a laser tracker head as it spins about the two axes results in small but measurable ranging and angle errors. The laser tracer, on the other hand, measures range with respect to the center of a high quality stationary sphere

Determining Mechanical Reliability of Brittle Materials

April 18, 2013
Author(s)
Stephen W. Freiman, Jeffrey Fong
The widespread existence of slow crack growth in most glasses and ceramics due to a stress-enhanced reaction between an external environment and strained bonds at a crack tip greatly complicates the challenge of assuring the reliability of components which

Fast, Optically Controlled Kerr Phase Shifter for Digital Signal Processing

April 18, 2013
Author(s)
Runbing Li, Lu Deng, Edward W. Hagley, Joshua Bienfang, Zachary H. Levine, Marvin G. Payne
We demonstrate an optically controlled Kerr phase shifter using a room-temperature Rb85 vapor operating in a Raman gain scheme. Phase shifts from zero to 𝜋 relative to an unshifted reference wave are observed, and gated operations are demonstrated. We

Guidelines for Evaluating Fire Blocking Barrier Fabrics

April 18, 2013
Author(s)
Shonali Nazare, William M. Pitts, Shaun M. Flynn, Rick D. Davis, John R. Shields
This document provides guidelines to quantify fire performance properties of fire blocking barrier materials used in soft furnishings. In an attempt to enable a priori selection of fire barrier materials such that the final upholstered product complies

Micro/nano-wear studies on epoxy/silica nanocomposites

April 18, 2013
Author(s)
Zhengzhi Wang, Ping Gu, Xiao-ping Wu, Zhong Zhang, Martin Chiang, Hui Zhang
We proposed a new method for quantifying the micro/nano-scale wear volume (i.e., volume of wear loss) in a test to characterize the wear-resistance of nanocomposites. Effects of wear load and pass (a pattern of scan cycles), and nanoparticle content on the

Tungsten L Transition Line Shapes and Energy Shifts Resulting from Ionization in Warm Dense Matter

April 18, 2013
Author(s)
Lawrence T. Hudson, John F. Seely, Bruce V. Weber, D. G. Phipps, Nino R. Pereira, D Mosher, K. Slabkowska, M. Polasik, J Rzadkiewicz, S Hansen, Uri Feldman, Joseph W. Schumer
High resolution spectra of the W L transitions in the energy range 8 keV to 12 keV from warm dense plasmas generated by the Naval Research Laboratory’s Gamble III pulsed power machine were recorded by a transmission-crystal x-ray spectrometer with ± 2 eV

Performance of Steel Shear Tab Connections at Elevated Temperatures

April 16, 2013
Author(s)
Mina S. Seif, Joseph Main, Therese P. McAllister
At the present time, there is a lack of understanding of the performance of structures as complete systems under extreme loading conditions such as realistic, uncontrolled fires. Current specifications for the design of steel structures in the U.S. do not

EFFECT OF HIGH LUMINANCE SOURCES TO PERIPHERAL ADAPTATION STATE IN MESOPIC RANGE

April 15, 2013
Author(s)
Tatsukiyo (. Uchida, Yoshihiro Ohno
CIE 191:2010 recommends a mesopic photometry system that defines the spectral luminous efficiency function for peripheral visual tasks. For implementation of the system, the visual adaptation field, which takes into account the surrounding luminance effect

Microfabricated Atomic Magnetometers

April 15, 2013
Author(s)
Svenja A. Knappe, John E. Kitching
In this chapter, we discuss miniaturized atomic magnetometers, and the technology and applications relevant to this somewhat unusual direction in magnetometer research and development. By “miniaturized”, we mean, in addition to their size, magnetometers

Nuclear magnetic resonance gyroscopes

April 15, 2013
Author(s)
Elizabeth A. Donley, John E. Kitching
This review begins with an introduction to NMR gyroscopes (NMRGs), followed by a discussion of the frequency shifts and relaxation mechanisms that determine and their performance. Specific NMRG implementations are then reviewed, including dual NMR species

SEISMIC FRAGILITY AND COST ANALYSES OF ACTIVELY CONTROLLED STRUCTURES

April 15, 2013
Author(s)
Kevin K. Wong, John L. Harris
Seismic fragility represents the probability that the structural response exceeds a given performance limit state due to a specified intensity of ground motion, and it has a direct relationship with the cost of rehabilitating the structural system. In this

Bell violation using entangled photons without the fair-sampling assumption

April 14, 2013
Author(s)
Marissa Giustina, Alexandra Mech, Sven Ramelow, Bernhard Wittman, Johannes Keffler, Joern Beyer, Adriana Lita, Thomas Gerrits, Sae Woo Nam, Rupert Ursin, Anton Zeilinger, Brice R. Calkins
The violation of a Bell inequality is an experimental observation that forces the abandonment of a local realistic viewpoint - namely, one in which physical properties are (probabilistically) defined before and independently of measurement, and in which no

Modeling and Simulation for Improving Ambulance Patient Compartment Design Standards

April 12, 2013
Author(s)
Deogratias Kibira, Yung-Tsun T. Lee, Allison Barnard Feeney, Jennifer L. Marshall, Larry Avery, Jennifer Moore, Carlotta Boone
Emergency medical service providers riding in ambulance patient compartments, while caring for patients, are at high risk of suffering injuries in case of a crash or sudden maneuver. Seat belts are one way to reduce the occurrence and severity of injuries

Reply to Comment on "Testing Three-body Quantum Electrodynamics with Trapped Ti20+ Ions: Evidence for a Z-Dependent Divergence between Experiment and Calculation"

April 12, 2013
Author(s)
Lawrence T. Hudson, C T. Chantler, M N. Kinnane, John D. Gillaspy, A.T. Payne, L F. Smale, Albert Henins, Joshua M. Pomeroy, J A. Kimpton, E Takacs, K Makonyi
We find that Epp’s [1] hypothesis - namely that the current experimental data set is well represented by a small constant or zero offset from the predictions of Artemyev et al. [2] - is not supported by standard statistical analysis. We find that adding

Block-copolymer healing of simple defects in a chemoepitaxial template

April 11, 2013
Author(s)
Paul N. Patrone, Gregg M. Gallatin
Using a phase-field model of block copolymers (BCPs), we characterize how a chemoepitaxial template with parallel lines of arbitrary width affects the BCP microdomain shape. The model, which is an extension of the Leibler-Ohta-Kawasaki theory, accounts for
Displaying 21476 - 21500 of 73697
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