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Displaying 43476 - 43500 of 73812

Co-Extrusion of Biocompatible Polymers for Scaffolds With Co-Continuous Morphology

April 1, 2002
Author(s)
N. R. Washburn, Carl Simon Jr., Alessandro Tona, H M. Elgendy, Alamgir Karim, Eric J. Amis
A methodology for the preparation of porous scaffolds for tissue engineering using co-extrusion is presented. Poly(espilon-caprolactone) is blended with poly(ethylene oxide) in a twin-screw extruder to form a two-phase material with micron-sized domains

Coherent Phase Equilibria in a Bending Film

April 1, 2002
Author(s)
Alexander L. Roytburd, Julia Slutsker
The theory of coherent phase diagrams is expanded to phase transformations in films. Coherent phase transformations in a free standing film or a thin plate are considered. It is suggested that the misfit between the phases dictates their layer arrangement

Combinatorial Materials Science: What's New Since Edison?

April 1, 2002
Author(s)
Eric J. Amis, X D. Xiang, J C. Zhao
Combinatorial methods, or high throughput experimentations, have captured the attention of the materials industry due to the promise of providing new discoveries faster, better, and cheaper. However, in the scientific community combinatorial methods have

Combinatorial Methods for Investigations in Polymer Materials Science

April 1, 2002
Author(s)
J C. Meredith, A P. Smith, A J. Crosby, Eric J. Amis, Alamgir Karim
Combinatorial methods of drug discovery in pharmaceuticals research are well known and more recent applications have led to the discovery and synthesis of new inorganic materials, catalysts, and organic polymers. Polymeric coatings play an important role

Comparison of Near-Infrared Transmittance and Reflectance Measurements Using Dispersive and Fourier Transform Spectrophotometers

April 1, 2002
Author(s)
James J. Butler, H Park, P Y. Barnes, E A. Early, C van Eijk-Olij, A E. Zoutman, S van Buller-Leeuwen, J G. Schaarsberg
A spectrophotometer based on an integrating sphere coupled to a commercial FTIR instrument has been constructed for regular spectral transmittance and reflectance measurements over the 1 m to 18 m wavelength region. Despite the large number of error

Critical Behavior of a Strain Percolation Model for Metals

April 1, 2002
Author(s)
Y Shim, Lyle E. Levine, R M. Thomson
Extensive simulations of a strain percolation model for a deforming metal have been performed to examine its strain behavior. We find that the total strain exhibits critical power-law behavior that is well explained by two-dimensional percolation theory

Designing Neutral-Atom Nanotraps With Integrated Optical Waveguides

April 1, 2002
Author(s)
J P. Burke, S G. Chu, Garnett W. Bryant, Carl J. Williams, Paul S. Julienne
Integrated optical structures offer the intriguing potential of compact, reproducible waveguide arrays, rings, Y-junctions, etc, that could be used to design evanescent field traps to transport, store, and interact atoms in networks as complicated as any

Direct RF to Optical Frequency Measurements With a Femtosecond Laser Comb

April 1, 2002
Author(s)
Scott A. Diddams, D J. Jones, Jun Ye, S T. Cundiff, John L. Hall, J K. Ranka, R S. Windeler
By spanning an optical octave (> 300 THz) with a broadened femtosecond laser frequency comb, we directly measure optical frequency standards at 1064/532nm, 633 nm and 778 nm in terms of the microwave frequency that controls thecomb spacing, which can be

Empirical Modeling Methods Using Partial Data

April 1, 2002
Author(s)
Gerard N. Stenbakken, Ruimin Liu, Gene Huang
Methods were developed to calculate empirical models for device error behavior from data sets with missing data. These models can be used to develop reduced point testing procedures for the devices. The partial data methods reduce the prediction

Friction Measurements of Ultra-Thin Carbon Overcoats in Air

April 1, 2002
Author(s)
P M. McGuiggan, C S. Bhatia, D Bogy, W Fong, Stephen M. Hsu
The friction force as a function of humidity was measured between 5 nm thick carbon films coated onto mica surfaces. The friction was found to be proportional to the area of contact. The shear stress at 0%, 33%, and 100% humidity was measured to be 25 +6

Grafting Segments from the Extracellular Surface of CCR5 onto a Bacteriorhodopsin Transmembrane Scaffold Confers HIV-1 Corcceptor Activity

April 1, 2002
Author(s)
N G. Abdulaev, T T. Strassmaier, T Ngo, R W. Chen, H Lueke, D D. Oprian, K D. Ridge
The G-protein coupled receptor CCR5 binds three distinct B-chemokines on the solvent exposed segments of the extracellular surface. This same region of CCr5 also interacts with certain macrophage-tropic strains of HIV-1. To investigate structural features
Displaying 43476 - 43500 of 73812
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