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Displaying 45776 - 45800 of 73994

On the Suitability of CF3Br as a Benchmark replacement Fire Suppressants

April 24, 2001
Author(s)
B A. Williams, J W. Fleming
We investigate the rationale for the use of CF,Br as a reference standard for alternative fire suppresants. Stating efficiencies of alternative agents on a relative basis to that of CF,Br is well founded from an engineering standpoint, but less so from a

Premixed Flame Inhibition by Manganese and Tin Compounds

April 24, 2001
Author(s)
Gregory T. Linteris, Vadim D. Knyazev, Valeri I. Babushok
Flame inhibition data exist for a few metallic compounds (Fe(CO)5, Pb(C2H5)4, CrO2Cl2) which show them to be one or two orders of magnitude more effective than halon 1301 at reducing the burning velocity of premixed methane-air flames. Little burning

TOWARDS SUBGRID SCALE MODELING OF SUPPRESSANT FLOW IN ENGINE NACELLE CLUTTER

April 24, 2001
Author(s)
P E. DesJardin, J M. Nelson, L A. Gritzo, David R. Keyser, T A. Ghee, J R. Tucker, P J. Disimile
The release and transport of a suppressant agent into an enclosed compartment is sensitive to local geometrical features or “clutter” that is difficult to resolve numerically without using an excessively large CFD grid. Such examples include wire bundles

Transient Application Recirculating Pool Fire, Agent Effectiveness Screen: Final Report

April 24, 2001
Author(s)
William L. Grosshandler, Anthony P. Hamins, Jiann C. Yang, Kevin B. McGrattan, Cary Presser
A three-year research effort has been conducted as part of the Next Generation Program (NGP) to develop a laboratory screening device suitable for predicting the behavior of halon alternatives in full-scale fire suppression experiments. Most of the work

Analysis of Samples Removed from a Damaged Pipeline

April 15, 2001
Author(s)
Paul E. Stutzman
A set of specimens adhered to a pipe, provided by National Safety Transportation Board (NTSB), were examined for microstructure evaluation. The section of a 40.6 cm diameter gasoline pipeline from which the specimens were obtained showed signs of

High Precision Comparison Between SNS and SIS Josephson Voltage Standards

April 15, 2001
Author(s)
Blaise Jeanneret, Alain Rufenacht, Charles J. Burroughs
Recently, a new Josephson voltage standard based on a 1 V programmable chip provided by the National Institute of Standards and Technology (NIST) was implemented at the Swiss Federal Office of Metrology (OFMET). A comparison with a conventional Josephson

Hybrid glass substrates for waveguide device manufacture

April 15, 2001
Author(s)
Samuel D. Conzone, Joseph S. Hayden, David S. Funk, Alexana Roshko, D. L. Veasey
Hybrid glass substrates composed of active (ER/Yb co-doped) and passive phosphate glass were prepared by a novel, low temperature joining process. The resulting hybrid substrates are chemically and physically robust; they can be cut, ground and polished by

Optoelectronic Device Performance on Reduced Threading Dislocation Density GaAs/Si

April 15, 2001
Author(s)
P. H. Taylor, W. A. Jesser, J. Bradshaw, M. Lara-Taysing, R. P. Leavitt, G. Simonis, W. Chang, W. W. Clark, Kristine A. Bertness
A technique for the heteroepitaxy of GaAs/Si films having reduced threading dislocation density is presented. The important attribute of this technique is the suppression of three-dimensional Volmer-Weber island formation during initial deposition. This

NIST Multizone Modeling Website

April 2, 2001
Author(s)
William S. Dols
This report presents an overview of the NIST Multizone Modeling Website developed by the Building and Fire Research Laboratory of the National Institute of Standards and Technology (NIST). Multizone modeling refers to the calculation of airflows, pressure

A Genetic Programming Ecosystem

April 1, 2001
Author(s)
J E. Devaney, John G. Hagedorn, O P. Nicolas, G Garg, A Samson, Martial Michel
Algorithms are needed in every aspect of parallel computing. Genetic Programmingis an evolutionary technique for automating the design of algorithms throughiterative steps of mutation and crossover operations on an initial population of randomly generated

A High-Speed Thermal Imaging System for Semiconductor Device Analysis

April 1, 2001
Author(s)
Allen R. Hefner Jr., David W. Berning, David L. Blackburn, Christophe C. Chapuy, Sebastien Bouche
A new high-speed transient thermal imaging system is presented that provides the capability to measure the transient temperature distributions on the surface of a silicon chip with 1 υs time, and 15 υm spatial resolution. The system uses virtual instrument

A Manufacturing Collaboratory Case Study - Companion Document

April 1, 2001
Author(s)
E E. Wierba, Amy Knutilla, Michelle P. Steves
This report summarizes a case study of a collaborative tool intervention within a geographically-distributed, product-development team of an automotive parts supplier. This report serves as a companion document to a larger, more detailed volume, prepared

A New Critical Review of Experimental Stark Widths and Shifts

April 1, 2001
Author(s)
N Konjevic, A Lesage, Jeffrey R. Fuhr, Wolfgang L. Wiese
We have undertaken, and almost completed, a new critical review of experimental data on Stark widths and shifts for spectral lines of non-hydrogenic neutral atoms and positive ions. This review covers the period from 1989 through the end of 1999 and
Displaying 45776 - 45800 of 73994
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