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Displaying 36551 - 36575 of 74045

R-22 Replacement Status (in Polish)

August 1, 2005
Author(s)
J M. Calm, Piotr A. Domanski
Since its initial recognition in 1928 and commercialization in 1936, R-22 has been applied in systems ranging from the smallest window air conditioners to the largest chillers and heat pumps, including those for district cooling and heating. Individual

Response to Fire Exposure of the Pentagon Structural Elements

August 1, 2005
Author(s)
Paul K. Mlakar, D O. Dusenberry, J R. Harris, G A. Haynes, Long Phan, M A. Sozen
An overview of fire damage sustained by the Pentagon structural elements in the September 11, 2001, terrorist attack is provided. The fire intensity in some compartments of the affected areas inside the Pentagon was approximated to be between those of the

September 11, 2001, Airliner Crash Into the Pentagon

August 1, 2005
Author(s)
Paul K. Mlakar, D O. Dusenberry, J R. Harris, G A. Haynes, Long Phan, M A. Sozen
The Pentagon was constructed between September 1941 and January 1943. A substantial renovation of the entire 6.6 million sq ft (610 thousand sq m) facility began in 1999 and is scheduled for completion in 2010. On September 11, 2001, a hijacked commercial

Similarity Based Retrieval from a 3D Human Database

August 1, 2005
Author(s)
Afzal A. Godil, Sanford P. Ressler
In this paper, we describe a framework for similarity based retrieval from a 3D human database. Our technique is based on both body and head shape representation and retrieval based on similarity of both of them. The 3D human database used in our study is

Sources of Uncertainties in Prompt Gamma-Ray Activation Analysis

August 1, 2005
Author(s)
Elizabeth A. Mackey, Rick L. Paul, Richard M. Lindstrom, David L. Anderson
Two prompt gamma-ray activation analysis (PGAA) facilities at the NIST Center for Neutron Research have been used routinely to perform elemental analyses of a variety of materials. Results from these analyses are usually expressed as mass fraction values

Stabilization of SPRTs for ITS-90 Calibrations

August 1, 2005
Author(s)
Dennis B. Minor, Gregory F. Strouse
At the National Institute of Standards and Technology (NIST), the ITS-90 calibration of standard platinum resistance thermometers (SPRTs) is performed in the Platinum Resistance Thermometer Calibration Laboratory over the temperature range from -189 C to

Stress Testing a Supply Chain Using Simulation

August 1, 2005
Author(s)
Sanjay Jain, Swee K. Leong
Simulation provides the capability to evaluate performance of a system operating under current or proposed configura-tions, policies and procedures. It is very applicable to evaluation of strategic and operational level plans for sup-ply chains. It is

Testing Web Applications by Modeling with FSMs

August 1, 2005
Author(s)
A Andrews, A. J. Offutt, R Alexander
The National Software Reference Library (NSRL) of the U.S. National Institute of Standards and Technology (NIST) collects software from various sources and publishes file profiles computed from this software (such as MD5 and SHA-1 hashes) as a Reference

The Fast Fourier Transform for Experimentalists Part II: Convolutions

August 1, 2005
Author(s)
D Donnelly, Bert W. Rust
The discrete Fourier transform (DFT) is a widely used tool for the analysis of measured time series data. The Cooley-Tukey fast Fourier transform (FFT) algorithm gives an extremely fast and efficient implementation of the DFT. This is the first of a series

Workshop on Reliability Issues in Nanomaterials

August 1, 2005
Author(s)
Robert Keller, David T. Read, Roop L. Mahajan
The Workshop on Reliability Issues in Nanomaterials was held at the Boulder Laboratories of the National Institute of Standards and Technology (NIST) on August 17-19, 2004. It was designed to promote a particular subset of NIST?s responsibilities under the

Impulsive Loading of Cellular Media in Sandwich Construction

July 31, 2005
Author(s)
Joseph A. Main, George A. Gazonas
Motivated by recent efforts to mitigate blast loading using energy absorbing materials, this paper investigates the uniaxial crushing of cellular media in sandwich construction under impulsive pressure loading. The cellular core material is modeled using a

Uncertainties in Aspheric Profile Measurements with the Geometry Measuring Machine at NIST

July 31, 2005
Author(s)
Ulf Griesmann, Nadia Machkour-Deshayes, Byoung C. Kim, Quandou (. Wang, Lahsen Assoufid
The Geometry Measuring Machine (GEMM) of the National Institute of Standards and Technology (NIST) is a profilometer for free-form surfaces. A profile is reconstructed from local curvature of a test part surface, measured at several locations along a line

Coupled Fire Dynamics and Thermal Response ofComplex Building Structures

July 30, 2005
Author(s)
Kuldeep R. Prasad, Howard R. Baum
Simulation of the effects of severe fires on the structural integrity ofbuildings requires a close coupling between the gas phase energy release andtransport phenomena and the stress analysis in the load bearing materials.The connection between the two is

Critical-Current Measurements on ITER Nb3Sn Strands: Effect of Temperature

July 29, 2005
Author(s)
Loren F. Goodrich, Najib Cheggour, John (Jack) W. Ekin, Theodore C. Stauffer
Transport critical-current (II c) measurements were made on commercial multifilamentary Nb 3Sn strands at temperatures (T) from 4 to 17 K and magnetic fields (H) from 0 to 14 T. Samples investigated were taken from the stage 1 pre-production strand for the
Displaying 36551 - 36575 of 74045
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