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Displaying 3051 - 3075 of 3892

Flammability Studies of New Cyanate Ester Resins

May 4, 1997
Author(s)
Jeffrey W. Gilman, Richard H. Harris Jr., James E. Brown
We have synthesized several new cyanate ester functionalized polystyrene polymers and copolymers. Poly(4-cyanatostyrene), PCS, poly(4-cyanatostyrene) "polymer grade", PCS-PG, poly(4-cyanatostyrene "novalak grade", PCS-NG, poly(4-cyanatostyrene-co

Algorithm for Estimating Carbon Monoxide Formation in Enclosure Fires

March 3, 1997
Author(s)
William M. Pitts
This paper introduces an engineering approach for estimating the generation rate of carbon monoxide (CO) within a room containing a fire. Four CO formation mechanisms: 1) quenching of a turbulent fire plume upon entering a rich upper layer, 2) mixing of

Effect of Sample Size on the Heat Release Rate of Charring Materials

March 3, 1997
Author(s)
S J. Ritchie, Kenneth D. Steckler, Anthony P. Hamins, Thomas G. Cleary, Jiann C. Yang, Takashi Kashiwagi
The burning of a horizontal wood slab situated atop an insulating substrate was modeled using three coupled submodels for the gas-phase, wood, and substrate processes. A global analytical model was used to determine the radiative and convective heat

Human Behavior in the World Trade Center Evacuation

March 3, 1997
Author(s)
R F. Fahy, Guylene Proulx
An explosion below the World Trade Center plaza in New York City on February 26, 1993, killed six workers, and resulted in injuries to over 1,000 occupants as they made their way out of the affected buildings. The explosion and subsequent fire caused

Three Dimensional Modeling of Intumescent Behavior in Fires

March 3, 1997
Author(s)
Kathryn M. Butler, Howard R. Baum, Takashi Kashiwagi
A method of studying the swelling and thermal behavior of intumescent materials using understanding of the basic physical and chemical processes is described. The material is treated as a highly viscous fluid with properties dependent on temperature. the

Hybrid Reinforced Precast Frame for Seismic Regions

March 1, 1997
Author(s)
J Stanton, William C. Stone, Geraldine S. Cheok
A precast, prestressed concrete framing system for resisting earthquake loads is described. The system uses both unbonded post-tensioned reinforcement and bonded bar reinforcement. Tests hve shown that its performance is equal or superior to that of a

CHEMICAL AND PHYSICAL INFLUENCES OF HALOGENATED FIRE SUPPRESSANTS

January 1, 1997
Author(s)
Valeri I. Babushok, Anthony P. Hamins, Wing Tsang, T Noto
The specific mechanisms by which fire suppressants influence flame properties have been determined on the basis of computer simulations. Attention is focussed on the relative contributions from physical and chemical processes. Chemical effects are most

Facility for Calibrating Heat Flu Sensors in a Convective Environment

January 1, 1997
Author(s)
David G. Holmberg, Kenneth D. Steckler, C A. Womeldorf, William L. Grosshandler
The National Institute of Standards and Technology (NIST) presently conducts heat flux sensor calibrations using standard radiation methods. In practice, however, many heat flux sensors are used in test environments where convective heat transfer dominates

Inhibitor Influence on the Bistability of a CSTR

January 1, 1997
Author(s)
Valeri I. Babushok, T Noto, Donald R. Burgess Jr., Anthony P. Hamins, Wing Tsang
Methane combustion in a continuously stirred flow tank reactor (CSTR) in the presence and absence of chemical inhibitors such as CF3I, CF3Br, CF3H, and a chemically inert gas with high heat capacity is simulated with the CHEMKIN program. The aim of the

Physical Modeling of Intumescent Fire Retardant Polymers

January 1, 1997
Author(s)
Kathryn M. Butler
Intumescent chemical systems are designed to swell into a thick, robust foam upon exposure to heat, protecting the underlying material from fire by providing a physical barrier to heat and mass transfer. The mechanisms determining the fire-resistant

Radiative Emission Fraction of Pool Fires Burning Silicone Fluids

January 1, 1997
Author(s)
R Buch, Anthony Hamins, K Konishi, D. Mattingly, Takashi Kashiwagi
The steady-state mass burning flux and the radiative flux profiles to the surroundings were measured for a series of burning silicone fluids and organic fuels in 0.1-m, 0.3-m, 0.6-m and 1-m pool burners. Short-chain silicone oligomers and aliphatic

Simple Piezoelectric Droplet Generator

January 1, 1997
Author(s)
Jiann C. Yang, W. S. Chien, M D. King, William L. Grosshandler
A design for a piezoelectric on-demand droplet generator is presented. Its simple construction and ease of operation distinguish this generator from other previously reported. The droplet generator has been successfully used to produce droplets of aqueous

Influence of CF3I, CF3Br, and CF3H on the High-Temperature Combustion of Methane

December 1, 1996
Author(s)
Valeri I. Babushok, T Noto, D R. Burgess, Anthony P. Hamins, Wing Tsang
The effects of a number of flame retardants (CF3I, CF3Br, and CF3H) on the high-temperature reactions of methane with air in a plug flow reactor are studied by numerical simulations using the Sandia Chemkin Code. The dependence of (a) the ignition dely and

Modeling and Measurements of Soot and Species in a Laminar Diffusion Flame.

December 1, 1996
Author(s)
I. M. Kennedy, C Yam, D. C. Rapp, R J. Santoro, Wing Tsang
A model of laminar, soot-laden ethene diffusion flames has been developed and compared with measurements in nonsooting and sooting flames. Concentrations of stable gas-phase species were measured with mass spectrometry; laser-induced fluorescence was used
Displaying 3051 - 3075 of 3892
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