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Displaying 18926 - 18950 of 73994

Firebrand Accumulation in Front of Structures in Large Outdoor Fires

December 10, 2014
Author(s)
Samuel L. Manzello, Sayaka Suzuki
The production of firebrands contributes to the spread of disastrous large outdoor fires. As structures are exposed to wind, stagnation planes are produced around structures. In a prior scoping study, the authors demonstrated that firebrands may accumulate

Ignition of Mulch beds exposed to firebrand showers

December 10, 2014
Author(s)
Samuel L. Manzello, Sayaka Suzuki
Mulch is commonly found near buildings and is a useful surrogate to study various fuels that may be present near buildings. To this end, mulch beds were exposed to continuous, wind-driven firebrand showers. These experiments build on our prior work where

Sample Allocation for Multiple Attribute Selection Problems

December 10, 2014
Author(s)
Dennis D. Leber, Jeffery W. Herrmann
Prior to making a multiple attribute selection decision, a decision-maker may collect information to estimate the value of each attribute for each alternative. In this work, we consider a fixed experimental sample budget and address the problem of how best

Biomass Particle Models with Realistic Morphology and Resolved Microstructure for Simulations of Intraparticle Transport Phenomena

December 9, 2014
Author(s)
Peter Ciesielski, Michael F. Crowley, M R. Nimlos, Aric Sanders, Gavin Wiggins, Bryon Donohoe
Biomass exhibits a complex microstructure of directional pores that can vary substantially between species of origin. However, models of biomass particles employed in simulations of conversion processes typically employ over-simplified geometry such as

Computing confidence intervals for common IR measures

December 9, 2014
Author(s)
Ian M. Soboroff
Confidence intervals quantify the uncertainty in an average and o↵er a robust alternative to hypothesis testing. We measure the performance of standard and bootstrapped con- fidence intervals on a number of common IR measures using several TREC and NTCIR

Microwave Determination of the Volume of a Pressure Vessel

December 9, 2014
Author(s)
Michael R. Moldover, James W. Schmidt, Keith A. Gillis, James B. Mehl, John D. Wright
Using microwave techniques that are scalable to very large volumes, we measured the interior volume of a 0.3 m 3, commercially-manufactured, pressure vessel with an uncertainty of 0.05 %, as confirmed by independent, more-accurate, gas-expansion

Formalizing Software Bugs

December 8, 2014
Author(s)
Irena Bojanova
Knowing what makes a software systems vulnerable to attacks is critical, as software vulnerabilities hurt security, reliability, and availability of the system as a whole. In addition, understanding how an adversary operates is essential to effective cyber

Generation of bright phase-matched circularly-polarized extreme ultraviolet high harmonics

December 8, 2014
Author(s)
Justin M. Shaw, Patrik Grychtol, Dmitriy Zusin, Ronny J. Knut, Tenio Popmintchev, Hans T. Nembach, Avner Fleischer, Henry Kapteyn, Margaret Murnane, Ofer Kfir, Oren Cohen
Circularly-polarized extreme UV and X-ray radiation provides valuable access to the structural, electronic and magnetic properties of materials. To date, this capability was available only at large-scale X-ray free-electron lasers or synchrotrons. Here we

Improvements to NISTs Air Speed Calibration Service

December 8, 2014
Author(s)
Iosif I. Shinder, Michael R. Moldover, Christopher J. Crowley, Bernard J. Filla
We discuss five significant improvements to the Air Speed Calibration Service conducted by the National Institute of Standards and Technology (NIST): 1. Reduced-uncertainty calibration of the secondary standard [Laser Doppler Anemometer, (LDA)] using a

Polarization of Bi2Te3 Thin Film in a Floating-Gate Capacitor Structure

December 8, 2014
Author(s)
Hui H. Yuan, Kai Zhang, Haitao Li, Hao Zhu, John E. Bonevich, Helmut Baumgart, Curt A. Richter, Qiliang Li
Metal-Oxide-Semiconductor capacitors with Bi2Te3 thin film sandwiched and embedded inside the oxide layer have been fabricated and studied. The capacitors exhibit ferroelectric-like hysteresis which is a result of the robust, reversible polarization of

Recent Work Leading Toward a New Evaluation of Neutron Standards

December 8, 2014
Author(s)
Allan D. Carlson, V G. Pronyaev, R. Capote, G M. Hale, F. J. Hambsch, T Kawano, S. Kunieda, W Mannhart, R O. Nelson, D. Neudecker, P Schillebeeckx, S Simakov, P Talou, X Tao, D. L. Smith, W Wang, A. Wallner
A number of national cross section libraries are planning new versions of their libraries including ENDF/B and JEFF. The first step in producing these new libraries is evaluating the neutron standards. A new evaluation of the standards is now underway

Effective and Scalable Uncertainty Evaluation for Large-Scale Complex System Applications

December 7, 2014
Author(s)
Kevin L. Mills, James J. Filliben, Junfei Xie, Yan Wan, Yi Zhou, Yu Lei
Effective uncertainty evaluation is a critical step toward real-time and robust decision-making for complex systems in uncertain environments. A Multivariate Probabilistic Collocation Method (M-PCM) was developed to effectively evaluate system uncertainty

High Performance Visualization in Science and Research

December 6, 2014
Author(s)
Tomasz P. Bednarz, John Taylor, Tony Huang, Wesley N. Griffin, Steven G. Satterfield, Judith E. Terrill, John G. Hagedorn
This work showcases four examples of scientific visualizations across various domains of research and science that were prepared at CSIRO in Australia, and NIST in the USA: visualization of bone cancer, RF propagation through the human body, touch-less

The Prehydration of Cement and Its Mitigation

December 6, 2014
Author(s)
Julyan Stoian, Tandre Oey, Jeffrey W. Bullard, Jian Huang, Aditya Kumar, Magdalena Balonis, Narayanan Neithalath, Gaurav Sant
Ordinary portland cement (OPC) prehydrates during storage or handling in moist environments, forming hydration products on or near its particles' surfaces. Prehydration is known to reduce OPC reactivity, but the extent of prehydration has not yet been

Toward a New Evaluation of the Neutron Standards

December 6, 2014
Author(s)
Allan D. Carlson, V G. Pronyaev, R. Capote, G M. Hale, F. J. Hambsch, T Kawano, S. Kunieda, R O. Nelson, D. Neudecker, P Schillebeeckx, S Simakov, D L. Smith, X Talou, A Wallner, W Wang
A new version of the ENDF/B library has been planned. The first step in producing this new library is evaluating the neutron standards. An evaluation is now underway with support from a Data Development Project of the IAEA. In addition to the neutron cross

An Equation of State for the Thermodynamic Properties of Cyclohexane

December 5, 2014
Author(s)
Yong Zhou, Jun Liu, Steven Penoncello, Eric Lemmon
In this work, an equation of state for cyclohexane has been developed using the Helmholtz energy as the fundamental property with independent variables of density and temperature. Multi-property fitting technology was used to fit the equation of state that
Displaying 18926 - 18950 of 73994
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