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Displaying 45401 - 45425 of 74142

Analysis of the Impedance Spectra of Short Conductive Fiber-Reinforced Composites

August 1, 2001
Author(s)
J M. Torrents, T Mason, A Peled, S Shah, Edward Garboczi
The presence of small amounts of short conductive fibers in a composite of finite matrix conductivity results in the subdivision of the one matrix impedance arc into two separate low and high frequency arcs in the complex impedance plane. These features

Analysis of the Impedance Spectra of Short Conductive Fiber-Reinforced Composites

August 1, 2001
Author(s)
Edward J. Garboczi, J M. Torrents, T O. Mason, A Peled, S P. Shah
The presence of small amounts of short conductive fibers in a composite of finite matrix conductivity results in the subdivision of the one matrix impedance arc into two separate low and high frequency arcs in the complex impedance plane. These features

Analyzing Broadband Free-Field, Absorber Measurements

August 1, 2001
Author(s)
David R. Novotny, Robert T. Johnk, Arthur Ondrejka
We present and analyze a method for free-field evaluation of broadband absorber in a non-ideal testing environment. Using broadband, short-impulse TEM horns, a frequency-rich spectrum (equivalent pulse length 0.5 ns) illuminates a sample of the material

Atmospheric Oxidation Mechanism of Methyl Pivalate, (CH 3 ) 3 CC(O)OCH 3

August 1, 2001
Author(s)
T J. Wallington, Y Ninomiya, M Mashino, M Kawasaki, Vladimir L. Orkin, Robert E. Huie, Michael J. Kurylo III
Flash photolysis-resonance fluorescence techniques were used to measure the rate constant for the reaction of OH radicals with methyl pivalate, (CH 3) 3CC(O)OCH 3 over the temperature range 250-370 K. The rate constant exhibited a weak temperature

BACnet Unraveled

August 1, 2001
Author(s)
Steven T. Bushby
Publication of ASHRAE and ANSI's BACnet communication protocol in 1995 ushered in a new era for building automation and control systems, making it possible to integrate building control products designed by different manufacturers. This change has proved

Building Integrated Photovoltaic Test Facility

August 1, 2001
Author(s)
Arthur H. Fanney, Brian P. Dougherty
The widespread use of building integrated photovoltaics appears likely as a result of the continuing decline in photovoltaic manufacturing costs, the relative ease in which photovoltaics can be incorporated within the building envelope, and the fact that

Ca 4 Nb 2 0 9 -CaTi0 3 : Phase Equilibria and Microstructures

August 1, 2001
Author(s)
Leonid A. Bendersky, Igor Levin, Robert S. Roth, Alexander J. Shapiro
Ca 4TiO 3-Ca 4Nb 2O 9 is a quasi-binary section, and all the phases participating in equilibrium are solid solutions of the binary end-members. The phases are perovskite-based ABO3-type, with a common stoichiometry Ca[Ca (1-x)/(3-2x)Nb (2-2x)/ (3-2x)Ti x/

Characterization of Thin and Ultrathin Polymer and Resist Films

August 1, 2001
Author(s)
D L. Goldfarb, Q Lin, M Angelopoulos, Christopher Soles, Eric K. Lin, Wen-Li Wu
The need for a better understanding of the physicochemical properties of radiation-sensitive thin polymer coatings for lithographic applications is driven by the trend of ever-shrinking pattern dimensions and film thickness, imposed by the semiconductor

Combinatorial Investigations of Polymer Adhesion

August 1, 2001
Author(s)
A J. Crosby, Alamgir Karim, Eric J. Amis
Combinatorial measurement methods allow material properties to be investigated in a multivariable space. These techniques could be especially attractive for investigating polymer adhesion that is determined by the complex coupling of bulk and interfacial

Comparison of Edge Detection Methods Using a Prototype Overlay Calibration Artifact

August 1, 2001
Author(s)
Richard M. Silver, Jay S. Jun, Edward A. Kornegay, R Morton
Accurate overlay measurements rely on robust, repeatable, and accurate feature position determination. In our effort to develop traceable we have examined a number of and the parameters which affect those measurements. The samples used in this study are a

Comparison of Two Cryogenic Radiometers at NIST

August 1, 2001
Author(s)
Jeanne M. Houston, David J. Livigni
Two cryogenic radiometers from NIST, one from the Optical Technology Division and the other from the Optoelectronics Division, were compared at three visible laser wavelengths. For this comparison each radiometer calibrated two photodiode trap detectors

Definitions of the Units Radian, Neper, Bel, and Decibel

August 1, 2001
Author(s)
I M. Mills, Barry Taylor, A J. Thor
The definition of coherent derived units in the International System of Units (SI) is reviewed, and the important role of the equations defining physical quantities is emphasized in obtaining coherent derived units. In the case of the dimensionless

Design of an Active MM-Wave Concealed Object Imaging System

August 1, 2001
Author(s)
Nicholas Paulter, Erich N. Grossman, Gerard N. Stenbakken, Bryan C. Waltrip, Shalva Nolen, Carl D. Reintsema
The research and design of an active millimeter-wave concealed object imaging system is described. Several illumination and detection methods were analyzed via computer simulation to assess the effects of system parameters on the signal-to-noise ratio of
Displaying 45401 - 45425 of 74142
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