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Airborne ultrafine particles (UFP) have been associated with human mortality and morbidity. Human exposure to ambient UFP occurs indoors due to entry of UFP into buildings. This study investigates UFP infiltration as a function of building operating
Steven J. Emmerich, David Heinzerling, Jung-il Choi, Andrew K. Persily
Control of airborne infectious agents in hospitals is critical both to effective health care and to the control of direct and indirect health care costs. Current hospital design guidelines focus on ventilation rates, room pressure control and air
Wenjuan Wei, Cynthia H. Reed, Andrew K. Persily, Yinping Zhang
Formaldehyde is recognized as a harmful indoor air pollutant for human health (IARC. 2004) and is emitted from building materials, including urea-formaldehyde resin in pressed wood products. Environmental chambers are typically used to measure formaldehyde
Richard D. Peacock, Jason D. Averill, Erica D. Kuligowski
This paper provides an analysis of the evacuation of the World Trade Center towers culled from telephone and face-to-face interviews with survivors. A decedent analysis explores where occupants were located when each tower was attacked. Multiple regression
Erica D. Kuligowski, Richard D. Peacock, Jason D. Averill
This paper provides an analysis of the evacuation of the World Trade Center towers culled from telephone and face-to-face interviews with survivors. A decedent analysis explores where occupants were located when each tower was attacked. Multiple regression
Sections of wood decks (1.2 m by 1.2 m) were constructed and attached to a re-entrant corner assembly. The deck/re-entrant corner assembly was then exposed to continuous, wind-driven firebrand bombardment generated by the newly developed NIST full-scale
WUI fires offer a unique challenge to the fire fighting and fire protection engineering communities. The scale of the events can be vast, spanning in many cases over 100,000 acres (40,000 ha) and the number of structures involved can range into the
The Blaine fineness (Blaine) of a cement powder is a single parameter that is meant to characterize the specific surface area of a cement, and is assumed to be linked to physical and mechanical properties such as strength, setting time, and rheology. As
Shonali Nazare, Shaun M. Flynn, Rick D. Davis, Joannie W. Chin
In this study, environmentally stressed OS fabrics containing melamine fiber blends were evaluated for thermal and mechanical properties that are critical to the protective performance of firefighter turnout gear. Environmental stress factors that affect
Richard G. Gann, Anthony P. Hamins, Kevin B. McGrattan, Thomas J. Ohlemiller, Kuldeep R. Prasad, William M. Pitts, Harold E. Nelson
The National Institute of Standards and Technology (NIST) conducted an extensive investigation of the collapse of the three tall World Trade Center (WTC) buildings. This paper describes the reconstruction of the fires, the thermal environment they created
Wanyu Chan, Francois R. Carrie, Jiri Novak, Andres Litvak, Fabrice Richieri, Oliver Solche, Wei Pan, Steven Emmerich
We collected information on existing envelope air leakage databases from countries that are involved in the AIVC-TightVent project "Development and applications of building air leakage databases". This document summarizes the information from five
Emil Simiu, Chris Letchford, Nicholas Isyumov, Arindam Chowdhury, DongHun Yeo
The purpose of this work is to present an assessment of methods for determining wind loads on buildings and other structures that warrant comment, correction or improvement. The assessment is intended to serve as a resource as a new version of the American
Methane is one of the major greenhouse gases and in recent years more efforts have been undertaken to estimate its emissions at local and regional scales utilizing new observing systems. During 2012, Earth Networks Inc. deployed a dense GHG observing
Kuldeep R. Prasad, Anthony Bova, James R. Whetstone, Elena Novakovskaia
Currently, inverse atmospheric dispersion models are being used around the world to provide measurement-based, or top- down, estimates of greenhouse gas (GHG) emissions for comparison with input-based, or bottom-up, estimates. To minimize uncertainty
Douglas M. Fox, Srilatha Temburni, Melissa Novy, Laura Flynn, Mauro Zammarano, Yeon S. Kim, Jeffrey W. Gilman, Rick D. Davis
Poly(lactic acid) was flame retarded using cellulose-based intumescing flame retardants. Cellulose was an excellent carbon source in combination with ammonium polyphosphate (APP), exhibiting good thermal stabilities and UL-94 ratings of V-0
Mauro Zammarano, Szabolcs Matko, Roland H. Kraemer, Rick D. Davis, Jeffrey W. Gilman, Li Piin Sung, Douglas M. Fox, Shivani N. Mehta
Smoldering is a self-sustaining heterogeneous oxidation reaction that induces a slow, low temperature, flameless combustion. Flexible polyurethane foams (PUF) are prone to smoldering due to their high air permeability, low density and high specific surface
A series of experiments were conducted to determine vulnerabilities of wood decks to continuous, wind-driven firebrand showers. Sections of wood decks (1.2 m by 1.2 m) were constructed and attached to a re-entrant corner assembly. The deck/re-entrant
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
Douglas S. Thomas, David T. Butry, Jeffrey P. Prestemon
Societal safeguards, established by those who have shared perceptions in the importance of safety and taking preventative measures, reduce the incidence of accidents that harm people and damage property. These safeguards prevent or discourage community
Randall J. McDermott, Hyun Wook Park, Kiyoung Moon, Ezgi Oztekin, Changhoon Lee, Jung-il Choi
A well-known challenge for large eddy simulation (LES) is to provide a smooth transition from molecular to turbulent transport near the wall without having to explicitly resolve the viscous sublayer. We propose a simple but efficient approach based on
A key limitation of current egress models is the scope and sophistication of the behavioral models that are embedded within them to determine what evacuees do and how long it takes them to do it. Kuligowski has recently produced a predictive behavioral
This paper presents a computational investigation of two reinforced concrete beam-column assemblies, each comprising three columns and two beams, subjected to monotonically increasing vertical displacement of the unsupported center column simulating a
Lisa C. Ng, Amy Musser, Andrew K. Persily, Steven J. Emmerich
Sixteen commercial reference buildings were created in the multizone airflow and contaminant transport program CONTAM in order to support airflow and indoor air quality (IAQ) analyses, which are not possible using the existing EnergyPlus input files for
This paper quantifies the influence of Al2O3 nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a rectangular finned boiling surface. Nanolubricants with 10 nm diameter Al2O3 nanoparticles of various volume fractions (1AlO, 2AlO
This report summarizes the characterization of the furnace thermal environment and thermal behavior of members during the fire tests. Additionally, numerical results from a heat transfer finite element model of a representative section of the floor system