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Displaying 49101 - 49125 of 143727

Modeling Thermoplastic Melt Spread Over Different Flooring Materials

July 5, 2010
Author(s)
Kathryn M. Butler, Eugenio Onate, Riccardo Rossi, Julio M. Marti, Sergio R. Idelsohn
The effects of the thermal properties of three flooring materials on the spread rate of polymer melt over the surface were studied using a model based on the Particle Finite Element Method (PFEM). The high thermal conductivity of steel keeps the steel

Numerical Simulation of Polymeric Materials in UL 94 Test: Competition Between Gasification and Melt Flow / Dripping

July 5, 2010
Author(s)
Kathryn M. Butler, Florian Kempel, Bernhard Schartel, Anja Hofmann, Eugenio O?, Sergio R. Idelsohn, Riccardo Rossi, Julio M. Marti
The capability of the Particle Finite Element Method (PFEM, developed by CIMNE) to model the complex fire behaviour of polymers in the UL 94 scenario was investigated. For validation, a series of four PC/ABS blends were chosen, which covered different UL

MODELING THE BURNING OF COMPLICATED OBJECTS USING LAGRANGIAN PARTICLES

July 4, 2010
Author(s)
Kevin B. McGrattan, Randall J. McDermott, William E. Mell, Glenn P. Forney, Jason E. Floyd, Simo A. Hostikka
A methodology is described for representing complicated objects within a computational fluid dynamics model. These objects are typically collections of similar items that are too small to define on the numerical grid that is used to solve the governing

Ettore Majorana and the birth of autoionization

July 2, 2010
Author(s)
Charles W. Clark, Ennio Arimondo, William C. Martin
In the early days of theoretical atomic spectroscopy, Ettore Majorana (1906-1938?) solved several outstanding problems by developing the theory of autoionization. Later literature makes only sporadic references to this accomplishment. Reviewing his work in

Large Magnetic Susceptibility Anisotropy of Metallic Carbon Nanotubes

July 2, 2010
Author(s)
Jeffrey A. Fagan, Erik K. Hobbie, Jun Kono, Thomas Searles, Y Imanaka, T Takamasu, H Ajiki
Through magnetic linear dichroism spectroscopy, the magnetic susceptibility anisotropy of metallic single-walled carbon nanotubes has been extracted and found to be 2-4 times greater than values for semiconducting single-walled carbon nanotubes. This large

The Second Static Analysis Tool Exposition (SATE) 2009

July 2, 2010
Author(s)
Vadim Okun, Paul E. Black, Aurelien M. Delaitre
The NIST SAMATE project conducted the second Static Analysis Tool Exposition (SATE) in 2009 to advance research in static analysis tools that find security defects in source code. The main goals of SATE were to enable empirical research based on large test

A Sensor-Driven Fire Model, Version 1.2

July 1, 2010
Author(s)
William D. Davis
Modern building fire sensors are capable of supplying substantially more information to the fire service than just the simple detection of a possible fire. In order to use this information, a decision support system needs to be developed that interprets a

Block shear failure of steel gusset plates

July 1, 2010
Author(s)
Chiara Crosti, Dat Duthinh
Following the catastrophic failure of the I-35W bridge in Minnesota in 2007, the Federal Highway Admin-istration issued guidelines for the load rating of bolted and riveted gusset plates in truss bridges (FHWA, 2009). This paper develops finite-element

Calibration service for instruments that measure laser beam diameter

July 1, 2010
Author(s)
Shao Yang
This document describes the calibration service for instruments that measure laser beam diameter. An overview of the measurement procedures, measurement system, and uncertainty analysis is presented. A sample measurement report is included in this document
Displaying 49101 - 49125 of 143727
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