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Displaying 45126 - 45150 of 73929

Photometry: Sensing Light Color

September 1, 2001
Author(s)
Yoshihiro Ohno, Steven W. Brown
This article first addresses the need and importance of photometry and colorimetry for many products in our daily life- light bulbs in homes and offices; TV sets, computer monitors, headlights of cars, traffic lights, etc. Then the concepts of photometry

Prediction of Lateral and Normal Force-Displacement Curves for Flipchip Solder Joints

September 1, 2001
Author(s)
Daniel Wheeler, Daniel Josell, James A. Warren, William E. Wallace
We present the results of experiments and modeling of flip-chip geometry solder joint shapes under shear loading. Modeling, using Surface Evolver, included development of techniques that use an applied vector force (normal and shear loading) as input to

Progress Towards Arrays of Microcalorimeter X-ray Detectors

September 1, 2001
Author(s)
Sae Woo Nam, David A. Wollman, Dale Newbury, Gene C. Hilton, Kent D. Irwin, David A. Rudman, Steven Deiker, Norman F. Bergren, John M. Martinis
The high performance of single-pixel microcalorimeter EDS (υcal EDS) has been shown to be very useful for a variety of microanalysis cases. The primary advantage of υcal EDS over conventional EDS is that factor of 25 improvement in energy resolution (3 eV

Radiometric Characterization of Field Radiometers in Support of the 1997 Lunar Lake, Nevada, Experiment to Determine Surface Reflectance and Top-of-Atmosphere Radiance

September 1, 2001
Author(s)
Steven W. Brown, Bettye C. Johnson, Howard W. Yoon, James J. Butler, R Barnes, S F. Biggar, P R. Spyak, Kurtis J. Thome, E F. Zalewski, M Helmlinger, C J. Bruegge, S Schiller, G Fedosejevs, R Gauthier, S Tsuchida, S Machida
A continuing series of field campaigns to Lunar Lake, Nevada, has been established for the development of ground-truth measurement protocols and assessment of measurement uncertainties for the ground-based calibration of on-orbit satellite sensors. In June

Reactivity of Vibrationally Excited Methane on Nickel Surfaces

September 1, 2001
Author(s)
L Halonen, S Bernasek, David Nesbitt
Four-Dimensional variational calculations have been performed for modeling energy flow between CH 2 stretching vibrational energy statesas the molecule adiabatically approaches a nickel surface. The model is based on a local mode Hamiltonian for isolated

REGTET: A Program for Computing Regular Tetrahedralizations

September 1, 2001
Author(s)
Javier Bernal
REGTET, a Fortran 77 program for computing a regular tetrahedralization for a finite set of weighted points in 3-dimensional space, is discussed. REGTET is based on an algorithm by Edelsbrunner and Shah for constructing regular tetrahedralizations with

Sapphire Statistical Characterization and Risk Reduction Program

September 1, 2001
Author(s)
D R. McClure, R W. Cayse, David R. Black, S M. Goodrich, K Peter, D Lagerloef, D C. Harris, D McCullum, D H. Platus, C E. Patty, Robert S. Polvani
The Sapphire Statistical Characterization and Risk Reduction Program tested 1400 4-point flexure bars with different crystal orientations at different temperatures to establish a mechanical strength database for engineering design. Sapphire coupons were

Simulation-Based Shop Floor Control: Formal Model, Model Generation,

September 1, 2001
Author(s)
Albert T. Jones, Y J. Son, R A. Wysk
The high cost of control software development and maintenance has been recognized as a significant problem inhibiting CIM solutions. In this paper, a structure and architecture for the rapid realization of a simulation-based real-time shop floor control

Sorptivity-Based Service Life Predictions for Concrete Pavements

September 1, 2001
Author(s)
Dale P. Bentz, M A. Ehlen, Chiara F. Ferraris, Edward J. Garboczi
The degradation of concrete pavements is often controlled by the transport of a deleterious species (chloride or sulfate ions, or water in the case of freeze/thaw) into the concrete. With this in mind, a three-year research project, funded by the Federal

Speaker Recognition in a Multi-Speaker Environment

September 1, 2001
Author(s)
Alvin F. Martin, Mark A. Przybocki
We discuss the multi-speaker tasks of detection, tracking, and segmentation of speakers as included in recent NIST Speaker Recognition Evaluations. We consider how performance for the two-speaker detection task is related to that for the corresponding one

Standards for Collaborative Product Development

September 1, 2001
Author(s)
Ram D. Sriram
We are currently witnessing the emergence of an Internet-based engineering marketplace, where engineers, designers, and manufacturers from small and large companies are collaborating through the Internet to participate in RFQs (requests for quotes), create

Tensile Properties of Free-Standing Aluminum Thin Films

September 1, 2001
Author(s)
David T. Read, Yi-Wen Cheng, R R. Keller, Joseph D. McColskey
Tensile properties of electron-beam-deposited free-standing aluminum thin films were measured. High ς y and UTS were observed, mainly due to fine grain sizes, consistent with values reported in the literature. The observed Young's modulus, as measured by
Displaying 45126 - 45150 of 73929
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