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Displaying 44651 - 44675 of 73461

Microstructural Characterization Studies to Relate the Properties of Thermal Spray Coatings to Feedstock and Spray Conditions

September 1, 2001
Author(s)
Andrew J. Allen, Gabrielle G. Long, H Boukari, J Ilavsky, A Kulkarni, S Sampath, H Herman, A N. Goland
This paper reports how the microstructural information, obtainable for thick plasma-sprayed ceramic deposits by small-angle scattering can be used to explore the relationships among the feedstock or spray process conditions, the anisotropic void and crack

Microstructural Properties of (Ba,Sr)Ti0 3 Films Fabricated from BaF 2 /SrF 2 /Ti0 2 Amorphouse Multilayers Using the Combinatorial Precursor Method

September 1, 2001
Author(s)
Ichiro Takeuchi, K S. Chang, R P. Sharma, Leonid A. Bendersky, H C. Chang, X D. Xiang, E A. Stach, C Y. Song
We have investigated the microstructure of (Ba,Sr)Ti0 3 films fabricated from BaF 2/SrF 2/Ti0 2 amorphouse multilayers. Rutherford backscattering spectroscopy and x-ray diffraction studies show that a controlled thermal treatment can interdiffuse the

Molecular Templating of Nanoporous Ultralow Dielectric Constant (approximate to 1.5) Organosilicates by Tailoring the Microphase Separation of Triblock Copolymers

September 1, 2001
Author(s)
S Y. Yang, P A. Mirau, C S. Pai, O Nalamasu, E Reichmanis, Eric K. Lin, V. J. Lee, D W. Gidley, J N. Sun
Triblock polymers, poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) (PEO-b-PPO-b-PEO), are used as molecular templates in poly(methyl silsesquioxane) (MSQ) matrices to fabricate nanoporous organosilicates. Initially homogeneous blends of the

MSEL 2001 Programs and Accomplishments: Materials Reliability Division

September 1, 2001
Author(s)
F R. Fickett, Thomas A. Siewert
The materials Reliability Division's mission is to develop and disseminate measurement methods and standards enhancing the quality and reliability of materials and to provide technical leadership in their introduction to appropriate industries. Our main

MSEL FY 2001 Programs and Accomplishments: Metallurgy Division

September 1, 2001
Author(s)
C A. Handwerker, Frank W. Gayle, Richard E. Ricker
This report describes major programs and accomplishments of the Metallurgy Division of the NIST Materials Science and Engineering Laboratory (MSEL) in FY2001 The mission of the NIST Metallurgy Division is to provide critical leadership in the development

MSEL FY 2001 Programs and Accomplishments: Polymers Division

September 1, 2001
Author(s)
B M. Fanconi, Eric J. Amis
The Polymers Division provides measurement methods, standards, and concepts to facilitate technology development, manufacture of products, commerce, and use of synthetic polymers. Projects are selected based on assessments of current needs and in

NIST-ASME Workshop on Uncertainty in Dimensional Measurements

September 1, 2001
Author(s)
Dennis A. Swyt
A 2 1/2-day workshop on problems in use of uncertainty in dimensional measurements sponsored by NIST and ASME was held June 5-7, 2001, at NIST in Gaithersburg, MD. The workshop was attended by fifty-six representatives of organizations including

NISURF-II, An Upgraded Surface Measuring Facility

September 1, 2001
Author(s)
S Z. Zahwi, M F. Koura, Thomas Brian Renegar, A M. Mekawi
During 1982-1985, a cooperative project was made between the National Bureau of Standards (NBS) at that time (now National Institute of Standards and Technology (NIST - USA)) and the National Institute for Standards (NIS - Egypt) to establish a

Object Identification Using Bar Codes Based on LADAR Intensity

September 1, 2001
Author(s)
William C. Stone, Geraldine S. Cheok, K M. Furlani, David E. Gilsinn
Tests of a novel concept for tracking construction components were carried out at the National Institute of Standards and Technology. The approach makes use of laser radar and retro-reflective barcodes attached to manufactured building materials. Tests

Phase Dependence in Radar Cross Section Measurements

September 1, 2001
Author(s)
Lorant A. Muth
A new measurement and analysis technique to isolate the background signals present in radar cross section measurements is presented. By definition the measured RCS of a target is independent of the measured phase, but it is not independent of the phase

Phase Equilibria of the SrO-Yb 2 O 3 -CuO x System in Air

September 1, 2001
Author(s)
J Dillingham, Winnie Wong-Ng, Igor Levin
The phase diagram of the SrO-Yb 2O 3-CuO x system was investigated in air. The solid solution (Sr 14-xYb x)Cu 24O z (O 13Yb)Cu 24O z indicated that this phase is incommensurate, with the modulation wave vector q=(1/2-z)c*, znearly equal to}0.066. The Sr

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
Displaying 44651 - 44675 of 73461
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