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Displaying 5951 - 5975 of 9857

Application of the Complex Kohn Variational Method to Attosecond Spectroscopy

August 6, 2018
Author(s)
Barry I. Schneider, Nicholas Douguet, Luca Argenti
The complex Kohn (CK) variational method is extended to compute light-driven electronic transitions between continuum wavefunctions in atomic and molecular systems. This development enables the study of multiphoton processes in the perturbative regime for

Navigating Unmountable Media with the Digital Forensics XML File System

May 31, 2018
Author(s)
Alexander J. Nelson, Alexandra Chassanoff, Alexandra Holloway
Some computer storage is non-navigable by current general-purpose computers. This could be because of obsolete interface software, or a more specialized storage system lacking widespread support. These storage systems may contain artifacts of great

Experimental scattering matrix for lunar regolith simulant JSC-1A at visible wavelengths

March 8, 2018
Author(s)
Edward J. Garboczi, Ann C. Chiaramonti Debay, Thomas V. Lafarge, O Munoz, J Escobar-Cerezo, D Guirado, JC Gomez-Martin, Jay Goguen, F Moreno
We present the experimental scattering matrix as a function of the scattering angle of the lunar soil simulant JSC-1A. The measurements were performed at 488 nm, 520 nm and 647 nm, covering the range of scattering angles from 3o to 177o. The size

Structural Analysis of a High-Rise Composite Frame Exposed to Fire

February 19, 2017
Author(s)
Dat Duthinh, Kuldeep Prasad
This paper presents a simplified, planar analysis of World Trade Center Tower 1 (WTC1), starting from a computer simulation of the fire using computational fluid dynamics, and progressing through a thermal and a structural analysis of the damaged structure

Modeling of Suspension Flow in a Pipe Geometry and Rheometers

May 18, 2016
Author(s)
Nicos Martys, Chiara F. Ferraris, William L. George
Abstract Measurement and prediction of the flow of suspensions like cement based materials represents a significant challenge for both the experimentalist and modeler. In this paper, results of a computational study of suspension flow in a pipe and a

Stochastic Modeling and Simulation of Marginally Trapped Neutrons

May 20, 2014
Author(s)
Kevin J. Coakley
For a magnetic trapping experiment, I present an efficient method for simulating experimental beta −decay rates which accounts for loss of marginally trapped neutrons due to wall collisions and other possible loss mechanisms. Monte Carlo estimates of time

Guidelines for Protecting Basic Input/Output System (BIOS) Firmware

June 28, 2011
Author(s)
Shirley M. Radack
This bulletin summarizes the information presented in NIST Special Publication (SP) 800-147, BIOS Protection Guidelines: Recommendations of the National Institute of Standards and Technology. The publication was written by David Cooper, William Polk

Approximating Periodic Solutions of Autonomous Delay Differential Equations

November 30, 2006
Author(s)
David E. Gilsinn
Machine tool chatter has been characterized as isolated periodic solutions or limit cycles of delay differential equations. Determining the amplitude and frequency of the limit cycle is sometimes crucial to understanding and controlling the stability of

A Fundamental Equation for Trifluoromethane (R-23)

December 1, 2003
Author(s)
S G. Penoncello, Eric Lemmon, R. T. Jacobsen, Z Shan
A formulation for the thermodynamic properties of trifluoromethane R-23) is presented. The equation is valid for single-phase and saturation states from the triple point (1 18.02 K) to 475 K at pressures up to 120 MPa. The formulation includes an equation

Assigning and Enforcing Security Policies on Handheld Devices

May 1, 2002
Author(s)
Wayne Jansen, Athanasios T. Karygiannis, Serban I. Gavrila, Vlad Korolev
The proliferation of mobile handheld devices, such as Personal Digital Assistants (PDAs) and tablet computers, within the workplace is expanding rapidly. While providing productivity benefits, the ability of these devices to store and transmit corporate

The NIST RS274NGC Interpreter - Version 3

August 1, 2000
Author(s)
Thomas R. Kramer, Frederick M. Proctor, Elena R. Messina
This report describes an interpreter which reads numerical control code and produces calls to a set of canonical machining functions. The interpreteris a software system written in the C++ programming language. The output of the interpreter may be used to

Multi-Enterprise Concurrent Engineering Through International Standards

October 1, 1991
Author(s)
Gary Carver, Howard Bloom
Concurrent engineering involves the integration of people, systems, and information into a responsive, efficient system. Integration of computerized systems allows additional benefits: automatic knowledge capture during the development and lifetime

Required Safe Egress Time: Data and Modeling

January 1, 2008
Author(s)
Jason D. Averill, Paul A. Reneke, Richard D. Peacock
This paper identifies sources of uncertainty in RSET (required safe egress time) calculations, with focus on data and modeling. A model for efficiently calculating the range of egress solutions for a particular design is presented. Three recommendations

Current and Future Parameters Used by FDS

December 15, 2021
Author(s)
Kevin B. McGrattan, Jason Floyd
This paper discusses important input parameters used by the Fire Dynamics Simulator (FDS), a computational fluid dynamics (CFD) model of fire. Suggestions are made for new or enhanced sub-models and measurements specifically for CFD models of fire.
Displaying 5951 - 5975 of 9857
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