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Displaying 43101 - 43125 of 73896

Virtual Reality Simulation of a Mechanical Assembly Production Line

August 1, 2002
Author(s)
Deogratias Kibira, Charles R. McLean
This paper presents our work on the application of virtual reality simulation to the design of a production line for a mechanically assembled product. The development of this simulation was undertaken as a part of the Manufacturing Simulation and

Structural Basis of Thermostability: Analysis of Stabilizing Mutations in Subtilisin BPN

July 26, 2002
Author(s)
O Almog, David Travis Gallagher, Jane E. Ladner, S Strausberg, Patrick Alexander, Phillip Bryan, G L. Gilliland
The crystal structures of two thermally stabilized subtilisin BPN' variants, S63 and S88, are reported here at 1.8 and 1.9 resolution, respectively. The micromolar affinity calcium-binding site (site A) has been deleted (δ 75-83) in these variants

A Model of Opposed Flow Flame Spread Over Charring Materials

July 25, 2002
Author(s)
A A. Atreya, Howard R. Baum
This paper presents a theoretical decsription of a diffusion flame spreading against the wind on a semi-infinite charring solid. It extends the previous flame spread models on vaporizing solids to charring materials like wood and provides a more realistic

Large Eddy Simulation of Buoyant Turbulent Pool Fires

July 25, 2002
Author(s)
J Gore, Kevin B. McGrattan, Ronald G. Rehm, Howard R. Baum
Three dimensional large eddy simulations (LES) of two buoyant flows were performed n conjunction with a Smagorinsky turbulence model. The flows included a non-reacting helium plume previously simulated with two-dimensional simulations and a methane/air

Raman Gain: Pump-wavelength Dependence in the Single-Mode Fiber

July 15, 2002
Author(s)
Nathan R. Newbury
The magnitude of the stimulated Raman gain spectrum will depend on the absolute pump wavelength. Measurements of the pump-wavelength scaling of the stimulated Raman gain of several single-mode fibers are presented. The measurements were obtained by use of

X-Ray Spectroscopy and Calibrations in the 50 eV to 60 keV Range

July 11, 2002
Author(s)
J Seely, Lawrence T. Hudson, J. Weaver, G Holland, C N. Boyer
Spectrometers have been developed to record x-ray spectra in the energy range 50 eV to 60 keV. The dispersion elements are transmission crystals for energies higher than approximately 10 keV, reflection crystals for 1 keV to 20 keV and transmission

SRM 2460/2461 Standard Bullets and Casings Project

July 10, 2002
Author(s)
Jun-Feng Song, Eric P. Whitenton, David R. Kelley, Robert A. Clary, L Ma, Susan M. Ballou, M Ols
The National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 2460/2461 standard bullets and casings project will provide support to firearms examiners and to the National Integrated Ballistics Information Network (NIBIN) in

A PDA Security Policy Enforcement Tool

July 9, 2002
Author(s)
Athanasios T. Karygiannis, Wayne Jansen, Serban I. Gavrila, Vlad Korolev
This paper describes a proof-of-concept implementation of a Personal Digital Assistant (PDA) Security Policy Enforcement Tool developed by NIST. This tool can assist enterprise security administrators in setting, updating, monitoring, and enforcing group

A Bose-Einstein Condensate in an Optical Lattice

July 1, 2002
Author(s)
J Denschlag, J E. Simsarian, H Heffner, C R. McKenzie, A Browaeys, D Cho, Kristian Helmerson, S L. Rolston, William D. Phillips
We have performed a number of experiments with a Bose-Einstein condensate (BEC) in a one dimensional optical lattice. Making use of the small momentum spread of a BEC and standard atom optics techniques a high level of coherent control over an artifical

A Facility for Nanoscience Research: An Overview

July 1, 2002
Author(s)
Joseph A. Stroscio, E Hudson, Steven R. Blankenship, Robert Celotta, Aaron P. Fein
We describe the development of an experimental system, consisting of a low temperature scanning tunneling microscope coupled to UHV tip and sample preparation chambers, with the goal of providing new measurement capabilities for the study of quantum and
Displaying 43101 - 43125 of 73896
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