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Displaying 47751 - 47775 of 73697

MODELING THE EFFECT OF WATER SPRAY SUPPRESSION ON LARGE-SCALE POOL FIRES

May 2, 2000
Author(s)
P E. DesJardin, L A. Gritzo, S R. Tieszen
In practical fire suppression systems for large rooms or compartments, water sprinklers are often located on or near the ceilings. In this configuration, the droplets from the water spray must be large enough to penetrate the high temperature thermal plume

Performance Data on Cold Temperature Dispersion of CF3I

May 2, 2000
Author(s)
Jiann C. Yang, Thomas G. Cleary, Michelle K. Donnelly
Tritluoroiodomethane (CF3I) has been proposed as a potential replacement for Halon 1301 in aircraft engine nacelle and dry bay fire protection applications. The potential use of CF3I in fuel tank ullage inerting has also been considered recently. Before

Performance of a Fast Response Agent Concentration Meter

May 2, 2000
Author(s)
Erik L. Johnsson, George W. Mulholland, Gerald T. Fraser, A Zuban, I I. Leonov
There is a need for monitoring the concentration of potential halon replacement chemicals with millisecond response time [I]. One scenario of great concern to the Air Force is the penetration of an enemy shell into the fuel tank of an aircraft. To prevent

SCREENING OF CANDIDATE FIRE SUPPRESSANTS

May 2, 2000
Author(s)
Marc R. Nyden, Jiann C. Yang, J D. Mather
Exploratory research has indicated that the following chemical families are likely 10 contain chemicals possessing both a high degree of fire suppression efficiency and low environmental impact: the bromoalkenes, bromoethers, and phosphorus-containing

1 Volt Josephson Fast Reversed DC Source

May 1, 2000
Author(s)
Charles J. Burroughs, Samuel Benz, Todd E. Harvey, H. Sasaki
We have made several improvements to the NIST Josephson FRDC (fast reversed dc) source so that it now operates at 1 Volt. We have made a precision comparison to a conventional semiconductor FRDC source by measuring the thermoelectric transfer difference of

4 Amp 4H-SiC JBD Diodes

May 1, 2000
Author(s)
Ranbir Singh, Sei-Hyung Ryu, M. Palmer, Allen R. Hefner Jr., Jih-Sheng Lai

A Capacitance Standard Based on Counting Electrons: Progress Report

May 1, 2000
Author(s)
Mark W. Keller, Neil M. Zimmerman, Ali L. Eichenberger, John M. Martinis
We have built a prototype capacitance standard based on single-electron tunneling (SET) devices and a cryogenic vacuum-gap capacitor. We are currently involved in a thorough uncertainty analysis of the prototype, and we are preparing to make a direct

A Dual-Balance High-Resistance Bridge in the Range of 1 T{O} to 100 T{O}

May 1, 2000
Author(s)
Dean G. Jarrett
The NIST dual-balance guarded active-arm bridge, using a third dc source and a second detector to balance the guard network, is described. Improvements to the NIST guarded active-arm bridge and the design and construction of improved high resistance

A Guide to EU Standards and Conformity Assessment

May 1, 2000
Author(s)
H Delaney, R van de Zande
This guide is an easy-to-use introductory reference for industry and government officials on the general principles and concepts behind the European Union's (EU) New Approach laws and directives. It is designed to help business and government officials

A More Efficient Use of D-CRLs

May 1, 2000
Author(s)
David A. Cooper
Δ-Certificate revocation lists (delta-CRLs) were designed to provide a more efficient way to distribute certificate status information. However, as this paper shows, in some environments, if delta-CRLs are used as was originally intended, the benefits of

A Multi-Frequency 4-Terminal-Pair AC Bridge

May 1, 2000
Author(s)
Anne-Marie Jeffery, John Q. Shields, Scott H. Shields
A 4-terminal-pair ac bridge, capable of a relative uncertainty of 2 x 10^-9^, has been constructed at NIST. The bridge is a multi-ratio bridge (10:1, 2:1 and 1:1) and operates in the range from 100 Hz to 2000 Hz. The design and initial testing of this

A New Fabrication Process for Planar Thin-Film Multijunction Thermal Converters

May 1, 2000
Author(s)
Thomas F. Wunsch, Joseph R. Kinard Jr., Ronald R. Manginell, O. M. Solomon, Thomas E. Lipe Jr.
Advanced thin flm processing and packaging technologies are employed in the fabrication of new planar thin-film multijunction thermal converters. The processing packaging, and design features build on experience gained from prior NIST demonstrations of

A Test Method for Assessing Interfacial Shear Strength in Composites

May 1, 2000
Author(s)
Gale A. Holmes, Donald L. Hunston, Walter G. McDonough, R C. Peterson
Two of the critical factors controlling the long-term performance and durability of composites in structural applications is the fiber-matrix interfacial shear strength (IFSS) and the durability of the fiber-matrix interface. The single fiber fragmentation

A=B?

May 1, 2000
Author(s)
Isabel M. Beichl, F Sullivan
In this prescription we'll describe one technique for working with extremely large integers having perhaps thousands of digits, using only standard hardware and software. This technique uses modular arithmetic in a way that lets us recover the actual

Absolute Magnetic Moment Measurements of Nickel Spheres

May 1, 2000
Author(s)
Robert D. Shull, Robert D. McMichael, L Swartzendruber, Stefan D. Leigh
The preparation and measurement of nickel spheres for use in the calibration of magnetometers are described. The absolute value of the magnetic moment of a set these spheres near room temperature was measured using the Faraday method. The variations of
Displaying 47751 - 47775 of 73697
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