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Displaying 13026 - 13050 of 74096

What a User Should Know About Selecting an Evacuation Model

February 19, 2017
Author(s)
Erica D. Kuligowski, Steve M. Gwynne
In recent years, evacuation models have been increasingly applied in an attempt to understand the outcome of emergency egress scenarios. This has been due to the introduction of performance-based codes and the availability of cost-effective, high

What Gets Measured, Gets Managed: A Case Study of Construction Safety

February 19, 2017
Author(s)
Robert E. Chapman
This article describes efforts within NIST's Building and Fire Research Laboratory to develop baseline measures for the National Construction Goals. The National Construction Goals were established in collaboration with representatives of the construction

Wildland-Urban Interface Fires: Overview and Research Needs

February 19, 2017
Author(s)
William E. Mell, Samuel Manzello, Alexander Maranghides, Ronald G. Rehm
Wildfires that spread into wildland-urban interface (WUI) communities present a significant challenge on a number of fronts. In the United States the WUI accounts for a significant portion of wildfire suppression and risk mitigation costs. Research on fire

Wind and Seismic Effects - Proceedings of the 38th Joint Panel Meeting

February 19, 2017
Author(s)
Stephen A. Cauffman
This publication is the Proceedings of the 38th Joint Meeting of the U.S.-Japan Panel on Wind and Seismic Effects. The meeting was held at the National Institute of Standards and Technology, Gaithersburg, Maryland during 15-17 May 2006. The Proceedings

Wind Effects on Tall Buildings: A Database-Assisted Design Approach

February 19, 2017
Author(s)
William P. Fritz, Emil Simiu
A rigorous procedure that calculates wind-induced effects on tall buildings is presented. The method, an extension of Database-Assisted Design (DAD), uses sets of time histories of pressures recorded simultaneously in the wind tunnel at a large number of

Wind Load Factors for Tall Building Design and the ASCE 7 Standard

February 19, 2017
Author(s)
Rene D. Gabbai, Emil Simiu
Wind load factors incorporated in the ASCE 7 Standard are based on rough approximations of wind effects and the uncertainties inherent in them. These factors are routinely applied to tall building design, even though the original calculations on which they

Wind Speeds for the Estimation of World Trade Center Towers' Response

February 19, 2017
Author(s)
William P. Fritz, Fahim H. Sadek, Emil Simiu
Estimates of the World Trade Center (WTC) towers response to wind by two North American wind engineering laboratories differed from each other by almost 40 %. A recent investigation by the National Institute of Standards and Technology determined that

Workshop on Purity and Dispersion Measurement Issues of Single Wall Carbon Nanotubes (SWCNTs)

February 19, 2017
Author(s)
Stephen W. Freiman, Richard R. Cavanagh, C K. Montgomery, Thomas J. Shaffner, S Arepalli, B Files, P Nikolaev
This document is an executive summary of a workshop organized jointly by the National Aeronautics and Space Administration, Lyndon B. Johnson Space Center (NASA/JSC) and the National Institute of Standards and Technology (NIST) was held on May 27-29, 2003

X-Ray Absorption Fine-Structure Determination of Ferroelectric Distortion in SrtiO 3 Thin Films grown on Si(001)

February 19, 2017
Author(s)
Joseph Woicik, F S. Aguirre-Tostado, A Herrera-Gomez, R Droopad, Z Yu, D G. Schlom, E Karapetrova, P Zschack, P Pianetta
Polarization-dependent x-ray absorption fine structure together with x-ray diffraction have been used to study the local structure in SrTiO 3 thin films grown on Si(001). Our data indicate that below a critical thickness of approximately 80 , the in-plane

Ba 8 CoNb 6 O 24 : A Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet in the Two-Dimensional Limit

February 17, 2017
Author(s)
R. Rawl, L. Ge, H. Agrawal, Y. Kamiya, C. R. Dela Cruz, Nicholas Butch, X. F. Sun, M. Lee, E. S. Choi, J. Oitmaa, C. D. Batista, M. Mourigal, H. D. Zhou, J. Ma
The quasi-two-dimensional perovskite Ba 8CoNb 6O 24 comprises equilateral effective spin-1/2 Co 2+ triangular layers separated by six nonmagnetic Nb 5+ layers. Susceptibility, specific heat and neutron scattering measurements combined with high-temperature

Direct measurement of Vorticella contraction force by micropipette deflection

February 17, 2017
Author(s)
Danielle C. France, Jonathan Tejada, Paul Matsudaira
The ciliated protozoan Vorticella convallaria is noted for its exceptionally fast ATP-independent cellular contraction, but direct measurements of contractile force have proven difficult given the length scale, speed, and forces involved. We used high

Field Programmable Josephson Amplifier for non-reciprocal microwave signal processing

February 17, 2017
Author(s)
Florent Q. Lecocq, Leonardo Ranzani, Gabriel A. Peterson, Katarina Cicak, Raymond W. Simmonds, John D. Teufel, Jose A. Aumentado
We report on the design and implementation of a Field Programmable Josephson Amplifier (FPJA) - a compact and lossless superconducting circuit that can be programmed in-situ by a set of microwave drives to perform reciprocal and non-reciprocal frequency

Limited options for low-global-warming-potential refrigerants

February 17, 2017
Author(s)
Mark O. McLinden, J S. Brown, Riccardo Brignoli, Andrei F. Kazakov, Piotr A. Domanski
Hydrofluorocarbons, currently used as refrigerants in air-conditioning systems, are potent greenhouse gases, and their contribution to climate change is projected to increase. Future use of the hydrofluorocarbons will be phased down and, thus, replacement

Partial breakdown of quantum thermalization in a Hubbard-like model

February 17, 2017
Author(s)
James R. Garrison, Ryan Mishmash, Matthew P. Fisher
We study the possible breakdown of quantum thermalization in a model of itinerant electrons on a one-dimensional chain without disorder, with both spin and charge degrees of freedom. The eigenstates of this model exhibit peculiar properties in the

Revised analysis of the fifth spectrum of rhenium (Re V)

February 17, 2017
Author(s)
Vladimir I. Azarov, R R. Gayasov
The spectrum of rhenium was observed in the (500 to 2100) A wavelength region. A 6.65 m normal incidence VUV spectrograph has been used to record the spectrum. The (5d3 + 5d26s) - 5d26p transition array of four times ionized rhenium, Re V, has been

Self-contained, Low Cost “Body-on-a-Chip” Systems for Drug Development

February 17, 2017
Author(s)
Ying Wang, Oleaga Carlota, Long Christopher, McAleer Christopher, Paula Miller, James J. Hickman, Michael L. Shuler, Mandy B. Esch
Integrated multi-organ microphysiological systems are an evolving tool for preclinical evaluation of the potential toxicity and efficacy of drug candidates. Such systems, also known as “Body-on-a-Chip” devices, have a great potential to increase the
Displaying 13026 - 13050 of 74096