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Displaying 40901 - 40925 of 73969

Energetics of Li Atom Displacements in K1-xLixTa03: First-Principles Calculations

July 1, 2003
Author(s)
S A. Prosandeev, Eric J. Cockayne, Benjamin P. Burton
K 1-xLi xTaO 3 (KLT) solid solutions exhibit a variety of interesting physical phenomena related to large local displacements of Li-ions from ideal perovskite A-site positions. First-principles calculations for KLT supercells were used to investigate these

Excess Noise Generation During Spectral Boradening in Microstructure Fiber

July 1, 2003
Author(s)
J N. Ames, S Ghosh
We observe that nanojoule femtosecond pulses that are spectrally broadened in microstructure fiber acquire excess noise. The excess noise is namifest as an increase in the noise floor of the rf spectrum of the photocurrent from a photodetector illuminated

Fourier Analysis Near-Field Polarimetry for Measurement of Local Optical Properties of Thin Films

July 1, 2003
Author(s)
Lori S. Goldner, Michael J. Fasolka, S Nougier, H P. Nguyen, Garnett W. Bryant, Jeeseong Hwang, K D. Weston, Kathryn L. Beers, A Urbas, Edwin L. Thomas
We present measurements of the local dichroism and birefringence of thin film specimens us ing techniques that combine near-field scanning optical microscopy (NSOM) and a novel polarization modulation (PM) polarimetry utilizing Fourier analysis of the

GMAW Wire Feedability: A Friction Model

July 1, 2003
Author(s)
A Padilla, D. R. Munoz, Timothy P. Quinn, R. A. Rorrer
A Hertzian-based contact model of the friction between the welding wire and the wire liner has been developed to predict the wire pulling force for gas metal arc welding (GMAW). The model predicts a 2.5:1 exponential increase inwire pulling force as the

High-frequency noise measurements in spin-valve Devices

July 1, 2003
Author(s)
N. A. Stutzke, S. L. Burkett, Stephen E. Russek
High-frequency magnetic noise in magnetoresistive devices being developed for read-sensor and magnetic random access memory applications may present fundamental limitations on the performance of sub-micrometer magnetic devices. High- frequency magnetic

IEEE 1451 Smart Wireless Machinery Monitoring and Control for Naval Vessels

July 1, 2003
Author(s)
T Brooks, S Chen, Kang B. Lee
The IEEE 1451 family of standards makes it easy to create solutions using existing networking technologies, standardized connections to smart devices, and a common software architecture. The standards allow the choice of application software, field network

In-situ conductance characterization of Fe/Ag multilayer contacts on GaAs

July 1, 2003
Author(s)
Dustin Hite, Stephen E. Russek, David P. Pappas
Electrical transport characteristics for epitaxially grown Ag/Fe/Ag multilayers on GaAs(100) and GaAs(110) have been studied under various growth conditions. The surfaces and structure of the multilayer were characterized by low energy electron diffraction

Integration of Airflow and Energy Simulation Using CONTAM and TRNSYS

July 1, 2003
Author(s)
Timothy P. McDowell, Steven Emmerich, J B. Thornton, George Walton
The impact of infiltration and ventilation flows on the energy use in commercial buildings has received little attention. One of the reasons for this lack of study is that the commonly-used programs for estimating the energy use of buildings do not

Interfacial Reactions of Ti/n-GaN Contacts at Elevated Temperature

July 1, 2003
Author(s)
C J. Lu, Albert Davydov, Daniel Josell, Leonid A. Bendersky
Interfacial reactions in Ti/GaN contacts have been studied using conventional and high-resolution transmission electron microscopy (TEM), energy-filtered TEM (EFTEM) and X-ray diffraction. The thin film contacts were fabricated by evaporating Ti on n-GaN

Laboratory Studies of Oxygen Continuun Absorption

July 1, 2003
Author(s)
Y I. Baranov, Gerald T. Fraser, Walter J. Lafferty, B Mate, A A. Vigasin
Laboratory studies of the mid and near infrared collision-induced absorption bands of O 2 are reviewed, with an emphasis on the 6.4 m and 1.27 m bands and on Ar, O 2, N 2, and CO 2 collision partners. These absorption bands are important in the radiative

Learning from Other Libraries: Benchmarking to Assess Library Performance

July 1, 2003
Author(s)
P J. Deutsch, Barbara P. Silcox
The Research Advisory Committee (RAC) at the National Institute of Standards and Technology (NIST) in its 2000 Annual Report to the NIST Director expressed concern that the NIST Research Library would not be able to meet the research needs of the

MALDI-TOF Mass Spectral Characterization of Covalently-Cationized Polystyrene

July 1, 2003
Author(s)
Sheng Lin-Gibson, S Bencherif, Kathryn Beers, H M. Byrd
Bromine terminated, controlled molecular mass polystyrene with narrow polydispersity (Mn 40 000 g/mol, PD = 1.08) was prepared by atom transfer radical polymerization. The bromine end group was subsequently substituted with a phosphonium salt. We report

Measurement of the Optical Extinction Coefficients of Post-Flame Soot in the Infrared

July 1, 2003
Author(s)
J F. Widmann, Jiann C. Yang, Samuel L. Manzello, George W. Mulholland
The optical extinction coefficients of post-flame soot have been measured in the wavelength range 2.8 micrometers to 4.1 micrometers. A laminar diffusion burner was combined with an infrared spectrograph and gravimetric measurements to determine the mass

Microwave Properties of Low-Temperature Co-Fired Ceramic Systems

July 1, 2003
Author(s)
Richard G. Geyer, Liang Chai, Aziz Shaikh, Vern Stygar
Co-fired, patterned multi-layer ceramic structures can provide RF designers with the means for compact, dense microwave circuit and component design spanning the frequency range from 800 MHz to 77 GHz. Critical parameters affecting the performance of these

Momentum-transfer dependence of x-ray Raman scattering at the Be K-Edge

July 1, 2003
Author(s)
C Sternemann, M Volmer, J A. Soininen, H Nagasawa, M Paulus, H Enkisch, G Schmidt, M Tolan, W Schulke
Inelastic x-ray scattering spectra have been measured for energy losses around the Be K-edge in order to perform a systematic study of the dependence of the corresponding dynamic structure factor on both the absolute value and the direction of the momentum

Monte Carlo Modeling of an Integrating Sphere Reflectometer

July 1, 2003
Author(s)
A Prokhorov, Sergey Mekhontsev, Leonard Hanssen
The Monte Carlo method has been applied to numerical modeling of an integrating sphere designed for hemispherical-directional reflectance factor measurements. It is shown that a conventional algorithm of inverse ray tracing used for estimation of

Nanoscale Oxidation of Zirconium Surfaces: Kinetics and Mechanisms

July 1, 2003
Author(s)
Natalia Farkas, Li Zhang, E A. Evans, R Ramsier, John A. Dagata
We show that AFM-induced oxide features can be reproducibly formed on both Zr and ZrN surfaces, and that the growth rate decreases rapidly with increasing time. There is an increase in oxide-feature height with humidity for both systems, and an

Network Transfer of Control Data: An Application of the NIST Smart Data Flow

July 1, 2003
Author(s)
Martial Michel, Vincent M. Stanford, O P. Galibert
Pervasive Computing environments range from basic mobile point of sale terminal systems, to rich Smart Spaces with many devices and sensors such as lapel microphones, audio and video sensor arrays and multiple interactive PDA acting as electronic brief
Displaying 40901 - 40925 of 73969
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