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Displaying 41326 - 41350 of 74404

Cosolvent-assisted Spray Pyrolysis for the Generation of Metal Particles

July 1, 2003
Author(s)
Valeri I. Babushok, S H. Ehrman, Thomas Germer, Jae H. Kim, George W. Mulholland
A co-solvent assisted spray pyrolysis process was developed for the formation of pure metal particles from metal salt precursors without the direct addition of hydrogen or other reducing gas. Generation of pure copper and nickelparticles from aqueous

Crystal Structure of the YchF Protein Reveals Binding Sites for GTP and Nucleic Acid

July 1, 2003
Author(s)
A Teplyakov, G Obmolova, S Y. Chu, J Toedt, E Eisenstein, A J. Howard, G L. Gilliland
The bacterial protein encoded by the gene ychF is 1 of 11 universally conserved GTPases, and the only one whose function is unknown. The crystal structure determination of YchF was sought to help with the the functional assignment of the protein. The YchF

Delivery of High Stability Optical and Microwave Frequency Standards Over an Optical Fiber Network

July 1, 2003
Author(s)
Jun Ye, J L. Peng, R J. Jones, K W. Holman, John L. Hall, D J. Jones, Scott A. Diddams, John E. Kitching, S Bize, James C. Bergquist, Leo W. Hollberg, Lennart Robertsson, L -. Ma
Optical and radio frequency standards located in JILA and NIST laboratories have been connected through a 6.9 km roundtrip optical fiber link. An optical frequency standard based on an Iodine stabilized Nd:YAG laser at 1064 nm with an instability of

Effects of Different Whiskers on the Reinforcement of Dental Resin Composites

July 1, 2003
Author(s)
Hockin D. Xu, Janet Quinn, Douglas T. Smith, Anthony A. Giuseppetti, F Eichmiller
Objective: Whiskers were recently used to reinforce dental composites to extend their use to large stress-bearing restorations. The aim of this study was to investigate the effects of different types of whiskers on composite properties. It was hypothesized

Electron Backscatter Diffraction for Studies of Localized Deformation

July 1, 2003
Author(s)
Roy H. Geiss, Alexana Roshko, Kristine A. Bertness, R R. Keller
Electron backscatter diffraction (EBSD) was used to study localized deformation in two types ofconstrained-volume materials. We present a study of deformation in narrow aluminum interconnects afterlow frequency, AC cycling at high current density. Joule

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
Displaying 41326 - 41350 of 74404
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