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Materials

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Displaying 2301 - 2325 of 2366

Permeability Prediction From Non-Destructive Imaging of Composite Microstructure

May 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., Kathleen M. Flynn, D P. Sanders, Richard~undefined~undefined~undefined~undefined~undefined Parnas
In this work, binary images of the microstructure of a unidirectional E-glass/epoxy composite were generated from the low contrast OCT data through image de-noising, contrast enhancement and feature recognition. The resulting data were input to a lattice

Workshop on Texture in Electronic Applications

May 1, 2001
Author(s)
Mark D. Vaudin, Debra L. Kaiser
A two day workshop on Texture in Electronic Applications was held on October 10-11,2000 at NIST, Gaithersburg. The workshop presented an excellent forum for discussion of a broad spectrum of texture-related issues of interest to academic,government and

Block Copolymer Thin Films: Physics and Applications

February 15, 2001
Author(s)
Michael J. Fasolka, A M. Mayes
A two-part review of research concerning block copolymer thin films is presented. The first section summarizes experimental and theoretical studies of the fundamental physics of these systems, concentrating upon the forces that govern film morphology. The

Fiber Optic Flow and Cure Sensing for Liquid Composite Molding

February 1, 2001
Author(s)
Joy P. Dunkers, Joseph~undefined~undefined~undefined~undefined~undefined Lenhart, S R. Kueh, J H. VanZanten, S G. Advani, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The Polymer Composites group at the National Institute of Standards and Technology has efforts in both on-line flow and cure sensing for liquid composite molding. For our flow program, a novel fiber optic real time sensor system has been developed that can

Texture Plus

February 1, 2001
Author(s)
Mark D. Vaudin
TexturePlus is a Win '95 or later software package that analyzes crystallographic texture in bulk and thin film specimens. The software analyzes data obtained on a powder x-ray diffractometer. The required data include an x-ray theta-2theta scan of a Bragg

Blackman Diagrams and Elastic-Constant Systematics

January 5, 2001
Author(s)
H M. Ledbetter
We consider Blackman diagrams for various cubic materials. These diagrams, plots of reduced elastic-stiffness coefficients C 12/C 11 versus C 44/C 11, show that materials with similar chemical bonding tend to fall in the same region of the diagrams. Such

Bulk-Moduli Systematics in Oxides Including Superconductors

January 5, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
For oxides, including superconductors, we consider the systematics of the bulk-modulus/atomic-volume (B/V a) relationship. For nonsuperconducting oxides, the B-V a diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure, AO; (2)

Elastic Gr neisen Parameters of Cubic Elements and Compounds

January 5, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
From a material's second-order elastic-stiffness coefficients C ijkl and its third-order elastic-stiffness coefficients C ijklmn, we calculated the scalar dimensionless Gr neisen parameter γ, the single most important property of an anharmonic solid. We

Broadband Dielectric Relaxation of Polymer Composite Films

January 1, 2001
Author(s)
C. K. Chiang, R Popielarz, R Nozaki, Jan Obrzut
The broadband dielectric relaxation of a BaTiO3-polymer composite film was studied. The complex dielectric constant data from 10 -4 Hz to 10 10 Hz reveals the existence of a relaxation process at a frequency of 10 MHz in the polymer composite. On the basis

Bulk and Surface Evidence for the Long Range Spatial Modulation of X-Ray Absorption in the AlPdMn Quasicrystal at Bragg Incidence

January 1, 2001
Author(s)
G Cappello, A Dechelette, F Schmithusen, S Decossas, J Chevrier, F Comin, V Formoso, M. De Boissieu, Terrence J. Jach, R. Colella, T Lograsso, C Jenks, D W. Delaney
An X-ray standing waves experiment was performed at the ID32 beam line of the ESRF on an Al-PD-Mn quasicrystal with the X-ray beam at normal incidence. The X-ray photoemission core levels for each element were recorded to probe the surface. The drain

Bulk-Moduli Systematics in Oxides, Including Superconductors

January 1, 2001
Author(s)
H M. Ledbetter, Sudook A. Kim
For oxides, including superconductors, we consider the systematics fo the bulk-modulus/atomic-volume (B/V α) relationship. For nonsuperconducting oxides, the B-V α diagram shows that most oxides fall in three sets: (1) rocksalt crystal structure, AO; (2)

Embracing Uncertainty: Modeling Uncertainty in EPMA - Part II

January 1, 2001
Author(s)
Nicholas Ritchie
This, the second in a series of articles present a new framework for considering the computation of uncertainty in electron excited X-ray microanalysis measurements, will discuss matrix correction. The framework presented in the first article will be

Preparation and Characterization of Photopatternable BaTiO 3 / Polymer Composites

January 1, 2001
Author(s)
R Popielarz, C. K. Chiang, R Nozaki, Jan Obrzut
The dielectric properties of acrylic resin composites filled with BaTiO 3 have been evaluated in the broad frequency range. These materials were used as models to study the dielectric response in polymer composite films for de-coupling capacitance

Quasicrystal Element Correlations From X-Ray Standing Waves

January 1, 2001
Author(s)
Terrence J. Jach
X-ray standing waves associated with dynamical diffraction in perfect crystals are also present during diffraction in high-quality quasicrystals. The fluorescence observed from quasicrystals while scanning the rocking curve of a particular Bragg reflection

Textile Composites: Modelling Strategies

January 1, 2001
Author(s)
S V. Lomov, G Huysmans, Y Luo, Richard~undefined~undefined~undefined~undefined~undefined Parnas, A Prodromou, I Verpoest, Frederick R. Phelan Jr.

The Application of Optical Coherence Tomography to Problems in Polymer Matrix Composites

January 1, 2001
Author(s)
Joy Dunkers, Frederick R. Phelan Jr., D P. Sanders, M J. Everett, William H. Green, Donald L. Hunston, Richard~undefined~undefined~undefined~undefined~undefined Parnas
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites often exhibit superior properties to
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