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Displaying 43701 - 43725 of 73815

Data Analysis Methods for Synthetic Polymer Mass Spectrometry: Autocorrelation

February 1, 2002
Author(s)
William E. Wallace, Charles M. Guttman
Autocorrelation is shown to be useful in describing the periodic patterns found in high-resolution mass spectra of synthetic polymers. Examples of this usefulness are described for a simple linear homopolymer to demonstrate the method fundamentals, a

Dendrimer-Star Polymers: Sub-Micrometer Probe Molecules

February 1, 2002
Author(s)
R C. Hedden, Barry J. Bauer, Eric J. Amis
Dendrimers are highly branched polymers prepared by alternating addition of monomers to a multifunctional core, resulting in a layered, treelike structure. Grafting monofunctional linear polymers (arms) onto dendrimer endgroups results in hybrid copolymers

Determination of Planck Mean Absorption Coefficients for HBr, HCl, and HF

February 1, 2002
Author(s)
Stephen P. Fuss, Anthony P. Hamins
The Planck mean absorption coefficient has been calculated for HBr HCl, and HF over a temperature range from 300 K-2300 K using data from the 1996 edition of the HITRAN molecular database. Plots of ap versus temperature showed monotonically decreasing

Development of a Diffusion Mobility Database for Ni-Base Superalloys

February 1, 2002
Author(s)
Carelyn E. Campbell, William J. Boettinger, Ursula R. Kattner
For a wide variety of Ni-base superalloy applications, including solidification, homogenization, y precipitation, bonding and repairing processes, and protective bond coats, multicomponent diffusion data are needed. Thus, in the Ni-Al-Co-Cr-Hf-Mo-Re-Ta-Ti

Development of a Reliability-Based Method of Service Life Prediction for Sealant

February 1, 2002
Author(s)
Christopher C. White, C Buch, Mark R. VanLandingham
Standard test methods, such as ASTM C719, evaluate sealant performance though threshold test measurements. This method and its derivatives do not offer reliable predictions of in-service performance. This article will detail efforts to move away from the

E-Concrete? Believe It!

February 1, 2002
Author(s)
G J. Frohnsdorff, Edward J. Garboczi
In recent years, the complexity of concrete mixture proportioning has increased dramatically. New chemical admixtures, such as high-performance superplasticizers and shrinkage-reducing admixtures, have been introduced into the marketplace. Due to both

Effects of Crosslink Density on Surface and Interface Properties of Amine-Cured Epoxy

February 1, 2002
Author(s)
Xiaohong Gu, Tinh Nguyen, Mark R. VanLandingham, D T. Raghavan
The effect of network changes on the surface and interface properties of amine-cured epoxy has been investigated. Samples of different crosslinked epoxies are prepared by mixing stoichiometrically pure diglycidyl ether of bisphenol A (n=0.03) with

Electrodeposition of Silver in Sub-Micron-Sized Features

February 1, 2002
Author(s)
B C. Baker, Thomas P. Moffat, Daniel Josell, Daniel Wheeler
Successful superfilling of lines and vias will be shown with a commercial, silver-cyanide electrolyte. Hysteretic i-V behavior and chronoamperometric transients on planar electrodes are used to extract parameters that quantify the kinetics of the

Electron Backscatter Diffraction (EBSD) of Single Particles

February 1, 2002
Author(s)
John A. Small
Over the years several different methods have been developed for the quantitative x-ray microanalysis of individual particles Small (1981), Armstrong (1991). Despite the large number of quantitative methods available, the accuracy for the x-ray

Electron-Impact Total Ionization Cross Sections of Hydrocarbon Ions

February 1, 2002
Author(s)
Karl K. Irikura, Yong Sik Kim, M A. Ali
The Binary-Encounter-Bethe (BEB) model for electron-impact total ionization cross sections has been applied to CH 2 +, CH 3 +, CH 4 +, C 2H 2 +, C 2H 4 +, C 2H 6 +, and H 3O +. The cross sections for the hydrocarbon ions are needed for modeling cool

Exchange bias and anisotropy in the Fe/KCoF 3 structure

February 1, 2002
Author(s)
Leszek Malkinski, Nicholas Cramer, Andrew Hutchinson, Robert E. Camley, Zbigniew J. Celinski, Danuta Skrzypek, Ronald B. Goldfarb
A new type of ferromagnet/antiferromagnet structure (fe/KCoF 3) was deposited by molecular beam epitaxy. Unidirectional and uniaxial anisotropies of 5.1 and 3.4 kA/m were measured at 23 K using ferromagnetic resonance. Magnetization measurements at 5 K

Features of Domain Nucleation and Growth in Co/Ru/Co Synthetic Antiferromagnets Deposited on Obliquely Sputtered Ta Underlayers

February 1, 2002
Author(s)
Alexander J. Shapiro, V S. Gornakov, Valerian I. Nikitenko, Robert D. McMichael, William F. Egelhoff Jr., Y W. Tahk, Robert D. Shull, L Gan
Obliquely sputtered Ta underlayers were used to stabilize antiferromagnetically couple Co/Ru/Co/Ta structures with a strong uniaxial anistropy. Magneto-optical indicator film (MOIF) imaging revealed nucleation and growth of domains during remagnetization

First Astronomical Use of Multiplexed Transition Edge Bolometers

February 1, 2002
Author(s)
D. J. Benford, Troy A. Ames, James A. Chervenak, Erich N. Grossman, Kent D. Irwin, S. A. De Kotwara, B. Maffci, S. H. Mosely, Francois Pajot, Thomas G. Phillips, Carl D. Reintsema, Cyrille Rioux, Rick A. Shafer, Johannes G. Staguhn, C. Vastel, George M. Voellmer
We present performance results based on the first astronomical use of mutiplexed superconducting bolometers. The Fabry-Perot Interferometer Bolometer Research Experiment (FIBRE) is a broadband submillimeter spectrometer that achieved first light in June

Foreword for Motohisa Kanda's Special Issue

February 1, 2002
Author(s)
Christopher L. Holloway, Perry F. Wilson
This special issue of the IEEE EMC Transactions is in honor of Dr. Motohisa Kanda who passed away on June 12, 2000. Dr. Kanda, known to most of us simply as "Moto," was an important figure within the EMC community and served as Editor of the IEEE EMC

Guide for the Selection of Communication Equipment for Emergency First Responders

February 1, 2002
Author(s)
Alim A. Fatah, John Barrett, Richard Arcilesi, Patrick Scolla, Charlotte H. Lattin, Susan Fortner
This guide includes information that is intended to assist the emergency first responder community in the selection of communication equipment for different applications. This specific work, Volume II of the Guide for the Selection of Communication

Improved Estimate of the Dissociation Energy of the Beryllium Dimer

February 1, 2002
Author(s)
J A. Harkless
Over the years, electronic structure theorists have frequently returned to the beryllium dimer and its dissociation energy as a problem of enduring popularity. There are two main reasons for this popularity. First, the beryllium dimer is one of the

Intelligent Control For Off-Road Driving

February 1, 2002
Author(s)
Karl Murphy, Marilyn N. Abrams, Stephen B. Balakirsky, Tommy Chang, Tsai Hong Hong, Alberto Lacaze, Steven Legowik
The NIST robot vehicle, a HMMWV with sensors and computer controlled actuators, detects how traversable the terrain is near the vehicle and computes its path and velocity accordingly. During tests the vehicle drives through the back fields of NIST at
Displaying 43701 - 43725 of 73815
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