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Displaying 42651 - 42675 of 73461

Systems Engineering Foundations of Software Systems Integration

August 1, 2002
Author(s)
Peter O. Denno, Allison Barnard Feeney
This paper concerns how engineering capability should be factored into problem solving agencies for application to software systems integration tasks, and how the results produced by these agencies should be communicated and integrated into a system

Test Procedures for Developing Solder Data

August 1, 2002
Author(s)
Thomas A. Siewert, C A. Handwerker
This publication documents standardized test procedures that can produce valid and reproducible mechanical property data for lead-free solders. Such data speeds the application of lead-free solders in high-volume, automated production of electronic

The Cations and Anions of Cyclobutanetetraone Poly(Phenylhydrazones)

August 1, 2002
Author(s)
H S. El Khadem, M A. Shalaby, B Coxon
Six cyclobutanetetraone poly (arylhydrazones) have been treated with acids and bases, and the structures of the resulting anions and cations studied by UV/visible absorption and NMR spectroscopy. In acid media, all the hydrazones studied formed cations

The Effect of Topic Set Size on Retrieval Experiment Error

August 1, 2002
Author(s)
Ellen M. Voorhees, C E. Buckley
Retrieval mechanisms are frequently compared by computing the respective average scores for some effectiveness metric across a common set of information needs or topics. Since retrieval system behavior is known to be highly variable across topics, good

The N 13 , N 5 + N 15 and N 9 + N 15 Bands of 10 B 2 H 6

August 1, 2002
Author(s)
Walter J. Lafferty, J.- M. Flaud, H Berger, G Pawelke
The 5 m absorption region of an isotopically pure sample of diborane 10B 2H 6 has been analyzed using high resolution (0.0025 cm -1) Fourier transform spectra. A set of precise experimental rotational-vibrational energy levels has been obtained for three

The Nature and Origin of Tribochemistry

August 1, 2002
Author(s)
Stephen M. Hsu, J Zhang, Z Yin
The origin of tribochemistry is from the rubbing of surfaces together. The precise nature of the chemical reactions and the driving force behind the reactions are not known except for a few simple chemical systems. In boundary lubrication, it is difficult

Three-Layer Model for Exchange Anisotropy

August 1, 2002
Author(s)
S M. Rezende, A Azevedo, F M. de Aguiar, J R. Fermin, William F. Egelhoff Jr., Sean R. Parkin
Recent x-ray absorption measurements have indicated that the interface between the antiferromagnetic (AF) and the ferromagnetic (FM) layers in AF/FM bilayers instead of being abrupt, consists of a thin layer with uncompensated spins. Here the effect of an

Time Domain Observation of the Lorentz-Local Field

August 1, 2002
Author(s)
Steven T. Cundiff
The Lorentz local field in a dense atomic vapor is observed using transient-four-wave-mixing, a time domain spectroscopic technique. The local field is manifest as a signal for negative delay. The strength of the negative delay signal can be related to the

Ultra-Thin Aluminum Oxide as a Thermal Oxidation Barrier on Metal Films

August 1, 2002
Author(s)
L Gan, Romel Gomez, Audie M. Castillo, P J. Chen, Cedric J. Powell, William F. Egelhoff Jr.
We have investigated the role of aluminum oxide films as barriers to thermal oxidation of Co, Ni, Fe, NiFe, Mn, Ta, Cu Al and Cr in air. The oxidation of the film is monitored by measuring the electrical resistance following a brief anneal in air. We find

Using a Localized Fluorescent Dye to Probe the Glass/Resin Interphase

August 1, 2002
Author(s)
Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, J H. VanZanten, Joy Dunkers, Richard~undefined~undefined~undefined~undefined~undefined Parnas
A novel technique has been developed to study the chemistry of buried polymer substrate interfacial regions by localizing a fluorescent probe to the substrate surface. Epoxy functional multi-layers of silane coupling agents were deposited on glass and

Virial Coefficients of Pure Gases

August 1, 2002
Author(s)
J H. Dymond, K N. Marsh, R C. Wilhoit, K C. Wong, Michael D. Frenkel
This critical compilation of virial coefficients of pure gases is a sequel to The Virial Coefficients of Pure Gases and Mixtures, by J.H. Dymond and E.B. Smith (Oxford University Press, 1979). This new and enlarged edition was prepared from the virial

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
Displaying 42651 - 42675 of 73461
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