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Displaying 49826 - 49850 of 73832

Parallel Monte Carlo Simulation Using Desktop Computers

August 1, 1999
Author(s)
J H. Scott, Robert L. Myklebust, Dale Newbury
Monte Carlo simulation of electron scattering in solids has proven valuable to electron microscopists for many years. The electron trajectories, x-ray generation volumes, and scattered electron signals produced by these simulations are used in quantitative

Pay Me Now or Pay Me Later

August 1, 1999
Author(s)
Isabel M. Beichl, F Sullivan
This is a tutorial article on the alias method which we use to sample from the Poisson distribution quickly.

Potential Energy Landscape Signatures of Slow Dynamics in Glass Forming Liquids

August 1, 1999
Author(s)
Srikanth Sastry, P G. Debenedetti, F H. Stillinger, T B. Schroder, J C. Dyre, S C. Glotzer
We study the properties of local potential energy minima (inherent structures) sampled by liquids at low temperatures as an approach to elucidating the mechanisms of the observed dynamical slow down as the glass transition temperature is approached. The

SEM/X-Ray Imaging of Cement-Based Materials

August 1, 1999
Author(s)
Dale P. Bentz, Paul E. Stutzman, C Haecker, S Remond
Scanning electron microscopy and X-ray imaging techniques have been developed for imaging the complex microstructure of cement-based materials such as cement powder and fly ash. By combining the information available in the backscattered electron and

Si Resonant Interband Tunnel Diodes Grown by Low-Temperature Molecular Beam Epitaxy

August 1, 1999
Author(s)
P E. Thompson, K D. Hobart, M E. Twigg, G Jernigan, T E. Dillon, S L. Rommel, P R. Berger, David S. Simons, P Chi, R Lake, A C. Seabaugh
Si resonant interband tunnel diodes that demonstrate negative differential resistance at room temperature are presented. The structures were grown using low temperature (320 C) molecular beam epitaxy followed by a post-growth anneal. After a 650 C, 1 min

Spatio-Spectral Mapping of Multimode Vertical Cavity Surface Emitting Lasers

August 1, 1999
Author(s)
K. J. Knopp, David H. Christensen, G. H. Vander Rhodes, J. M. Pomeroy, B. B. Goldberg, M. S. {Umlat}nl{umlat}
This paper reports the spatial and spectral characteristics of multimode vertical cavity surface emitting laser (VCSEL) emission using near field scanning optical microscopy (NSOM).

SRM 2806 (ISO Medium Test Dust in Hydraulic Oil): A Particle-Contamination Standard Reference Material for the Fluid Power Industry

August 1, 1999
Author(s)
Robert A. Fletcher, Jennifer R. Verkouteren, Eric S. Windsor, David S. Bright, Eric B. Steel, John A. Small, Walter S. Liggett Jr
Standard Reference material (SRM) 2806 is composed of ISO medium test dust (ISO 12103-A3), a mineral dust, suspended in MIL-H-5606 hydraulic oil. SRM 2806 is a traceable particle count standard and is certified for number of particles larger than a

Strain Rate Effects in the Single Fiber Fragmentation Test for Fiber Matrix Adhesion

August 1, 1999
Author(s)
Donald L. Hunston, Gale A. Holmes, R C. Peterson, Walter G. McDonough
In this paper, precise measurements of fiber break regions formed during the single fiber fragmentation testing procedure have been made for E-glass/diglycidyl ether of bisphenol-A (DGEBA)/meta-phenylenediamine (m-PDA) single fiber fragmentation test (SFFT

The Critical Evaluation of a Comprehensive Mass Spectral Library

August 1, 1999
Author(s)
P Ausloos, C L. Clifton, S G. Lias, Anzor I. Mikaia, Stephen Stein, Dmitrii Tchekhovskoi, O D. Sparkman, Vladimir G. Zaikin, D Zhu
A description of the methods used to build a high quality, comprehensive reference library of electron-ionization mass spectra is presented. Emphasis is placed on the most challenging part of this project the improvement of quality by expert evaluation

The Essence of the Process Specification Language

August 1, 1999
Author(s)
Craig I. Schlenoff
In all types of communication, the ability to share information is often hindered because the meaning of information can be drastically affected by the context in which it is viewed and interpreted. This is especially true among manufacturing simulation

The Life-Cycle Costs of Fiber-Reinforced-Polymer Bridge Decks

August 1, 1999
Author(s)
M A. Ehlen
Fiber-reinforced polymer (FRP) composites are currently being developed and integrated into bridge structures. This report examines the life-cycle cost effectiveness of three FRP bridge decks, using an economic method specifically tailored to comparing new

The Next Generation of Active Cavity Radiometers for Space-Based Remote Sensing

August 1, 1999
Author(s)
Joseph P. Rice, Steven R. Lorentz, T M. Jung
Active cavity radiometers (ACRs) have been used for years to measure solar radiation and Earth radiation from low Earth orbit. Extant space-flight ACRs were designed to measure relatively high irradiance values, approximately 136 mW/cm 2 for total solar

Thermal and Mass Diffusion in a Semidilute Good Solvent-Polymer Solution

August 1, 1999
Author(s)
K J. Zhang, M E. Briggs, R W. Gammon, J V. Sengers, Jack F. Douglas
The Soret coefficient S T and collective (mass) diffusion coefficient D c of polystyrene dissolved in the good solvent toluene is measured over a range of concentrations and molecular weights using an optical beam deflection method. Our measurements

Welding Consumable Development for a Cryogenic (4K) Application

August 1, 1999
Author(s)
S F. Kane, A L. Farland, Thomas A. Siewert, Christopher N. McCowan
This paper summarizes the development and qualification of an appropriate welding consumable for a demanding cryogenic magnet application. It begins with a review of the research conducted on cryogenic fracture toughness of wrought and welded austenitic
Displaying 49826 - 49850 of 73832
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