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Fire

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Displaying 2401 - 2425 of 3910

Elastic Properties of Model Random Three-Dimensional Open-Cell Solids

January 1, 2002
Author(s)
A P. Roberts, Edward Garboczi
Most cellular solids are random materials, while practically all theoretical structure-property relations are for periodic models. To generate theoretical results for random models the finite element method (FEM) was used to study the elastic properties of

Enhanced Powder Panels

January 1, 2002
Author(s)
D C. Cyphers, Scott A. Frederick, John P. Haas
Ballistic threat-induced fires are a major contributor to aircraft vulnerability. This paper describes a recent investigation of new concepts for powder panels, an old alternative for discharging dry chemical agents to extinguish combat-induced fires in

Experimental Study of a Water Droplet Impinging on a Liquid Surface

January 1, 2002
Author(s)
Samuel L. Manzello, Jiann C. Yang
An experimental study is presented for water droplet impingement on a liquid surface. The impaction process was recorded using a high-speed digital camera at 1000 frames per second. The initial droplet diameter was fixed at 3.1 mm 0.1 mm and all

Field Test of a Photovoltaic Water Heater

January 1, 2002
Author(s)
Arthur H. Fanney, Brian P. Dougherty, J O. Richardson
A solar photovoltaic water heating system has been installed at the Great Smoky Mountains National Park. The system provides hot water for the restroom facilities at the Park's main visitor center. This paper gives an overview of the technology, describes

Fluoroalkyl Phosphorus Fire Extinguishing Agents

January 1, 2002
Author(s)
R E. Tapscott, J M. Shreeve, J D. Mather
Phosphorus compounds show extraordinary effectiveness as flame extinguishants, and there is evidence for a chemical mechanism. Most work to date, however, has emphasized alkyl phosphonates and related materials or phosphonitriles. The former compounds are

Inhibition of Premixed and Non-Premixed Flames with Fine Droplets of Water and Solutions

January 1, 2002
Author(s)
Harsha K. Chelliah, A K. Lazzarini, P N. Wanigarathne, Gregory T. Linteris
Inhibition/extinction of premixed and non-premixed methane-air flames with fine-droplets of water and solutions containing several chemical agents are investigated experimentally. While solutions allow delivery of much higher concentrations of chemical

INTUMESCENT INSTANT FIREWALLS FOR LOW-COST FIRE PROTECTION

January 1, 2002
Author(s)
Ginger Bennett
Intumescent materials respond to impingement of a fire by swelling and forming a protective char that physically and thermally protects the structure. Intumescent materials have been used (or investigated for use) in various military platforms for all

Investigation of Velocity Boundary Conditions in Counterflow Flames

January 1, 2002
Author(s)
W C. Park, Anthony Hamins
The effects of velocity boundary conditions on the structure of methane-air nonpremixed counterflow flames were investigated by two-dimensional numerical simulation. Two low global strain rates, 12 s-1 and 20 s-1, were considered for comparison with

LIQUID AGENT TRANSPORT AROUND SOLID OBSTACLES

January 1, 2002
Author(s)
Cary Presser, J F. Widmann, G Papadopoulos
The focus of this effort is to investigate the dispersal of liquid fire suppression agents around solid obstacles, and obtain a better understanding of the physical processes of droplet transport in cluttered spaces. An experimental investigation is

Nanocharacterization of Surface and Interface of Different Epoxy Networks

January 1, 2002
Author(s)
Xiaohong Gu, D T. Raghavan, D L. Ho, Li Piin Sung, Mark R. VanLandingham, Tinh Nguyen
The effect of network changes on the surface and interface properties of amine-cured epoxy has been investigated. Samples of different crosslinked epoxies are prepared by mixing stoichiometrically pure diglycidyl ether of bisphenol A (n=0.03) with

On the Mitigation of Early Age Cracking

January 1, 2002
Author(s)
Dale P. Bentz, M R. Geiker, O M. Jensen
Potential means of limiting early age cracking ofconcrete structures have been investigated. Threedifferent methods of mitigating autogenous strainsand stresses in cement mortars (w/s=0.35, 8 % silica fume) are compared: 1.) reduction of thesurface tension

Standards of Seismic Safety for Existing Federally Owned and Leased Buildings

January 1, 2002
Author(s)
Stephen A. Cauffman, Hai S. Lew
The seismic safety evaluation and mitigation standards, Standards for Seismic Safety for Existing Federally Owned and Leased Buildings, were developed for use by the Federal Government by the Interagency Committee on Seismic Safety in Construction (ICSSC)

Suppression Effectiveness of Aerosols: The Effect of Size and Flame Type

January 1, 2002
Author(s)
J W. Fleming, B A. Williams, R S. Sheinson
This paper summarizes efforts to identify properties of aerosols (liquids and solids) leading to effective fire suppression. It is part of the US Department of Defense’s Next Generation Fire Suppression Technology Program (NGP) supported by the DoD

Temperature Regions of Optimal Chemical Inhibition of Premixed Flames

January 1, 2002
Author(s)
M D. Rumminger, Valeri I. Babushok, Gregory T. Linteris
Chemically-active fire suppressants may, due to their properties or the means by which they are added to flames, have strong inhibition effects in particular locations in a flame. To study the spatial effects of chemically-active inhibitors, numerical

Thermal Degradation and Flammability Properties of Polypropylene-Carbon Nanotube Composites

January 1, 2002
Author(s)
Takashi Kashiwagi, E Grulke, J Hilding, Richard H. Harris Jr., W H. Awad, J. F. Douglas
Nanocomposites based on polypropylene and carbon nanotubes (up to 2 vol.-%) were melt blended, yielding a good dispersion of nanotubes without using any organic treatment or additional additives. Carbon nanotubes are found to significantly enhance the
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