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Displaying 44876 - 44900 of 73960

Method for Estimating Mixture Equation of State Parameters

November 1, 2001
Author(s)
Eric W. Lemmon, Mark O. McLinden
A predictive method for estimating the zij parameter in the mixture model of Lemmon and Jacobsen [Int. J. Thermophysics 20:1629 (1999)] has been developed. Data for 76 binary pairs have been used in the development of this method, and these data are

Modeling of Superelastic Adaptive Composites

November 1, 2001
Author(s)
Julia Slutsker, Alexander L. Roytburd
An adaptive composite containing a shape memory alloy as an active component is the subject of this research. These composites utilize the unique properties of SMA, which change their crystalline structure in response to the change temperature and stress

Nanomachining of Si with Si3N4 Masks Patterned by Scanning

November 1, 2001
Author(s)
F S. Chien, John A. Dagata, W F. Hsieh, S Gwo
We demonstrate that local oxidation of silicon nitride films deposited on conductive substrates with a conductive-probe atomic force microscope (AFM) is a very promising approach for nanofabrication. Scanning Auger microscopy and spectroscopy are employed

NIST Materials Properties Databases for Advanced Ceramics

November 1, 2001
Author(s)
R G. Munro
The NIST Ceramics Division maintains two materials property databases on the physical, mechanical, thermal, and other properties of high temperature superconductors and structural ceramics. Crystallographic data are featured prominently among the physical

Phase Equilibria and Crystallography of Ceramic Oxides

November 1, 2001
Author(s)
Winnie K. Wong-Ng, Robert S. Roth, Terrell A. Vanderah, H F. McMurdie
Research in phase equilibria and crystallography has been a tradition in the Ceramics Division at NIST since the early thirties. In the early years, effort was concentrated in areas of Portland cement, ceramic glazes and glasses, instrument bearings and

Physical Degradation Of Polymeric Coating Surfaces Using Atomic Force Microscopy

November 1, 2001
Author(s)
Mark R. VanLandingham, M Giraud, Tinh Nguyen, Walter E. Byrd, Jonathan W. Martin
Atomic force microscopy (AFM) and Fourier Transform Infrared (FTIR) spectroscopy were used to monitor physical and chemical changes, respectively, in acrylic melamine coatings caused by exposure to a 50 C, 70 % relative humidity environment with and

Polyelectrolyte Adsorption on Hydroxyapatite

November 1, 2001
Author(s)
Vincent A. Hackley
Hydroxyapatite (HAP) belongs to a family of structurally and chemically related, sparingly soluble calcium phosphate (CP) salts [1], and is the structural prototype for the principal mineral component of bone and teeth [2]. Well-defined synthetic HAP has

Polymers in Particulate Systems: Properties and Applications

November 1, 2001
Author(s)
Vincent A. Hackley, P Somasundaran, J A. Lewis
Soluble polymers are key additives for a broad range of industrial and biomedical applications, including advanced ceramics, mineral separations, high performance cement, and bioceramic coatings and composites. Such species find widespread use as

Primary Calibration of Accelerometers at NIST Using a Dual Coil Shaker

November 1, 2001
Author(s)
Beverly F. Payne, David J. Evans
Until recently, the primary calibration of accelerometers at NIST over a frequency range of 50 Hz to 5 kHz utilized three different shakers with separate measurement systems. With the development of the NIST supershaker and associated calibration system

Probe Diffusion in Thin PS Free-Standing Films

November 1, 2001
Author(s)
Y Pu, H White, Miriam Rafailovich, J Sokolov, A Patel, Christopher C. White, Wen-Li Wu, V Zaitsev, S A. Schwarz
DSIMS was performed to determine the dynamics of thin free standing polystyrene films by investigating the probe diffusion in high molecular weight polymer matrix. It is found that the temperature dependence of the diffusion of small molecular probes can

Quasicrystals

November 1, 2001
Author(s)
John W. Cahn
The discretely diffracting aperiodic crystals termed quasicrystals, discovery at NBS in the early 1980s, have led to much interdisciplinary activity involving mainly materials science, physics, mathematics, and crystalography. It led to a new understanding
Displaying 44876 - 44900 of 73960
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