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Displaying 6801 - 6825 of 7113

Steering a Time Scale

December 1, 2008
Author(s)
Judah Levine
A time scale is a procedure for combining the data from an ensemble of clocks or frequency standards. The input data to the ensemble algorithm are generally the time (or frequency) differences between each of the members and the reference device for the

Accuracy Issues in Chemical and Dimensional Metrology in the SEM and TEM

October 16, 2008
Author(s)
J H. Scott
In this work computer simulations are used to understand systematic errors and accuracy concerns in both dimensional and chemical metrology in the scanning electron microscope (SEM) and transmission electron microscope (TEM).Multislice high-resolution TEM

Fire Induced Thermal and Structural Response of the World Trade Center Towers

September 26, 2008
Author(s)
Kuldeep R. Prasad, Anthony P. Hamins, Therese P. McAllister, John L. Gross
Over the past several years, there has been a resurgence of interest in studying the response of building structures to fires. Typically, the thermal loading for structural analysis of a building subject to fire is obtained from a standard time-temperature

Final Report on the Collapse of World Trade Center Building 7. Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1A) ***DRAFT for Public Comments***

August 1, 2008
Author(s)
Sivaraj Shyam-Sunder, Richard G. Gann, William L. Grosshandler, Hai S. Lew, Richard W. Bukowski, Fahim Sadek, Frank W. Gayle, Jason D. Averill, James R. Lawson, Harold E. Nelson, Stephen A. Cauffman
This is the final report on the National Institute of Standards and Technology (NIST) investigation of the collapse of World Trade Center Building 7 (WTC 7), conducted under the National Construction Safety Team Act. This report describes how the fires

Shear Thinning Near the Critical Point of Xenon

April 17, 2008
Author(s)
Robert F. Berg, Michael R. Moldover, M Yao, G A. Zimmerli
We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < γτ < 700, where γτ is the shear rate scaled by the relaxation time τ of

Torsion rotation global analysis of the first three torsional states (mt = 0, 1, 2) and terahertz database for methanol

March 30, 2008
Author(s)
Jon T. Hougen, Li-Hong Xu, Jonathan M. Fisher, H. Y. Shi, J C. Pearson, Brian J. Drouin, G A. Blake, R. Braakman
Stimulated by recent THz measurements of the methanol spectrum in one of our laboratories, undertaken in support of NASA programs related to the Herschel Space Observatory (HSO) and the Atacama Large Millimeter Array (ALMA), we have carried out a global

Model for Reversible Nanoparticle Assembly in a Polymer Matrix

January 8, 2008
Author(s)
Andrew Rahedi, Jack F. Douglas, Francis W. Starr
The clustering of nanoparticles (NP) within solutions and polymer melts depends sensitively on the strength and directionality of the NP interactions involved, as well as the molecular geometry and interactions of the dispersing fluids. Since clustering

A Common Operator Control Unit Color Scheme for Mobile Robots

December 28, 2007
Author(s)
Michael O. Shneier, Roger V. Bostelman, James S. Albus, William P. Shackleford, Tommy Chang, Tsai Hong Hong
… a very difficult experience evalu-ating what the robot was computing based on stereo image, instrumented bumper, and …

Development of the Aerosol Particle Mass Analyzer

October 17, 2007
Author(s)
Nobuhiko Fukushima, Naoko Tajima, Kensei Ehara, Hiromu Sakurai, Kevin Coakley
The Aerosol Particle Mass Analyzer (APM), can classify particles according to their mass-to-charge ratio. The utility of the APM has been confirmed; the APM has been applied to atmospheric aerosol research and engine exhaust measurements. The operating

Federal Building and Fire Safety Investigation of the World Trade Center Disaster: Final Report of the National Construction Safety Team on the Collapses of the World Trade Center Towers (NIST NCSTAR 1)

December 1, 2005
Author(s)
Sivaraj Shyam-Sunder, Richard G. Gann, William L. Grosshandler, Hai S. Lew, Richard W. Bukowski, Fahim Sadek, Frank W. Gayle, John L. Gross, Therese P. McAllister, Jason D. Averill, James R. Lawson, Harold E. Nelson, Stephen A. Cauffman
This is the final report on the National Institute of Standards and Technology (NIST) investigation of the collapse of the World Trade Center (WTC) towers, conducted under the National Construction Safety Team Act. This report describes how the aircraft

What a User Should Know When Selecting an Evacuation Model.

December 1, 2005
Author(s)
Erica D. Kuligowski, Steve M. Gwynne
In recent years, evacuation models have been increasingly applied in an attempt to understand the outcome of emergency egress scenarios. This has been due to the increased use of performance-based design and the availability of cost-effective, high

Experimental Determination of Electron Inelastic Mean Free Paths in 13 Elemental Solids in the 50 eV to 5000 eV Energy Range by Elastic-Peak Electron Spectroscopy

May 1, 2005
Author(s)
S Tanuma, T Shiratori, Tetsuya Kimura, K Goto, S Ichimura, Cedric J. Powell
We have determined electron inelastic mean free paths (IMFPs) in C (graphite), Si, Cr, Fe, Cu, Zn, Ga, Mo, Ag, Ta, W, Pt and Au by elastic-peak electron spectroscopy (EPES) using Ni as a reference material for electron energies between 50 eV and 5000 eV

Monte Carlo Strategies for Simulations of Electron Backscattering from Surfaces

May 1, 2005
Author(s)
Aleksander Jablonski, Cedric J. Powell, S Tanuma
Reliable algorithms for simulation of electron trajectories in solids are needed for quantification of Auger electron spectroscopy, particularly for determination of the backscattering factor (BF). The computational schemes for this purpose should be

Assembled Designs for Estimation of Location, Dispersion, and Random Effects

March 1, 2005
Author(s)
A Aviles, B E. Ankenman, J C. Pinheiro
In many experimental settings, different types of factors affect the measured response. The factors that can be set independently of each other are called crossed factors. Nested factors cannot be set independently because the level of one factor takes on

Linewidth Measurement from a Stitched AFM Image

January 1, 2005
Author(s)
Joseph Fu, Ronald G. Dixson, Ndubuisi G. Orji, Theodore V. Vorburger, C Nguyen
Image stitching is a technique that combines two or more images to form one composite image, which provides a field of view that the originals cannot. It has been widely used in photography, medical imaging, and computer vision and graphics. For such

XML Schema Design Quality Test Requirements

October 1, 2004
Author(s)
Boonserm Kulvatunyou, KC Morris
Consistent design of XML schema within an organization or single integration project can reduce the number and the severity of interoperability problems. In addition, this consistency makes the XML schema easier to extend, understand, implement, and

Fire Safety of Passenger Trains. Phase 3. Evaluation of Fire Hazard Analysis Using Full-Scale Passenger Rail Car Tests (NISTIR 6563)

April 1, 2004
Author(s)
Richard D. Peacock, Jason D. Averill, Daniel M. Madrzykowski, D W. Stroup, Paul A. Reneke, Richard W. Bukowski
Fire safety is an area of particular interest for both conventional intercity and commuter passenger trains, and new high-speed trains. A systems approach to fire safety addresses passenger rail car design and materials, detection and suppression
Displaying 6801 - 6825 of 7113
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