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William M. Pitts, Kathryn M. Butler, Valentine Junker
This report summarizes the collection and analysis of visual material used for the National Institute of Standards and Technology (NIST) World Trade Center (WTC) Investigation. The task consisted of four major subtasks: 1) identification, collection, data
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 increased use of performance-based design and the availability of cost-effective, high
Minimization of free energy is used to calculate the equilibrium shapes of sessile liquid drops under different wetting conditions and under the influence of a gravitational body force. The total system free energy is assumed to obey an equation recently
Samuel L. Manzello, Thomas G. Cleary, John R. Shields, Jiann C. Yang
Firebrands or embers are produced as trees and structures burn in wildland/urban interface (WUI) fires. Hot firebrands ultimately come to rest and may ignite fuels far removed from the fire, resulting in fire spread. It is believed that firebrand showers
Quantifying the ventilation available to a room fire is an important step to understanding fire behavior. The fresh air that moves into an enclosure provides the oxygen necessary to support the combustion while also serving to moderate the temperature of
William M. Pitts, Kathryn M. Butler, Valentine Junker
The attack on the World Trade Center (WTC) in New York City on September 11, 2001 by terrorists flying hijacked commercial aircraft into the two towers (WTC 1 and WTC 2) was among the worst building disasters in the history of the United States. In
The main objective of this study is to evaluate the workability of fresh portland cement concrete while it is still in the mixing truck by determining fundamental rheological parameters (plastic viscosity and yield stress). Nine concrete mixtures with
Anthony P. Hamins, Matthew F. Bundy, Scott E. Dillon
Common household open flame and radiant ignition sources are the actual or suspected cause for many fires. The purpose of this research is to identify the burning behavior and properties of common candles in order to provide additional tools for use by
Common household open flame and radiant ignition sources are the actual or suspected cause for many fires. Because of their popular use, fire investigators have identified candles as one of the most important of these ignition sources. In spite of this
A proposal for BACnet secure messaging is nearing public release by the BACnet standard committee (ASHRAE SSPC-135). The proposal adds a level of BACnet specific security to existing IT security, extending the BACnet standard to offer basic security using
The force term accounting for intermolecular interactions, with application to discrete Boltzmann simulation methods, is derived directly using a density gradient expansion of the BBGKY collision operator. It is shown that previous calculations, based on
Results from a numerical study examining the cross-property correlations linking fluid permeability to conductive properties and to a number of pore size parameters based on 3D digitized images of sedimentary rock are presented. In particular we focus on
Closed circuit breathing devices recycle exhaled air after scrubbing carbon dioxide and adding make-up oxygen from a tank of pure oxygen. Use of this equipment allows first responders to work for up to four hours without swapping out cylinders
Safety levels are a public policy decision made by regulators and not the technical community. It is appropriate for the technical community to suggest technical justification for safety levels, performance levels that can be achieved, and their associated