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Displaying 34851 - 34875 of 73832

Surface oxidation of Permalloy thin films

January 24, 2006
Author(s)
M. R. Fitzsimmons, Thomas J. Silva, T. M. Crawford
The chemical and magnetic structures of oxides on the surface of Permalloy Ni 81Fe 19 films were investigated as functions of annealing time with x-ray and polarized neutron reflectometry. For annealing times of less than one hour, the oxide consisted of a

Design of Self-Assembled Multiferroic Nanostructures in Epitaxial Films

January 23, 2006
Author(s)
Igor Levin, Jiying Li, Julia Slutsker, Alexander L. Roytburd
An approach for a rational design of self-assembled multiferroic nanostructures with controlled phase morphologies was demonstrated using the 3-D epitaxial CoFe2O4-PbTiO3 films grown on single-crystal SrTiO3 substrates. The transverse nanostructures

Polyelectrolyte Multilayers

January 23, 2006
Author(s)
Darwin Reyes-Hernandez, Laurie E. Locascio, Michael Gaitan
The process of self-assembly occurs naturally in living systems to form complex structures out of random events in an incredibly accurate way. Order out of disorder is achieved in a fashion that is analogous to a jigsaw puzzle where each piece fits

Internal Rotation and Spin Conversion of CH 3 OH in Solid Para-Hydrogen

January 20, 2006
Author(s)
Y J. Wu, R M. Lees, L H. Xu, Jon T. Hougen, Yuan-Pern Lee
The quantum solid para-hydrogen (p-H2) has recently emerged as a novel host for matrix-isolation spectroscopy; species isolated in p-H2 exhibit spectral lines with widths much smaller than for samples in other inert-gas matrices, and several species have

Comparison of the Fouling Release Properties of Hydrophobic Fluorinated and Hydrophilic PEGylated Block Copolymer Surfaces

January 19, 2006
Author(s)
S Krishman, N Wang, Christopher K. Ober, J Finlay, M E. Callow, J A. Callow, A Hexemer, K E. Sohn, E J. Kramer, Daniel A. Fischer
To understand the role of surface-wettability on adhesion of cells, the attachment of two different marine algae was studied on hydrophobic and hydrophilic polymer surfaces. Adhesion of cells of the diatom Navicula and sporelings (young plants) of the

Error Analysis For Encoding a Qubit In An Oscillator

January 19, 2006
Author(s)
Scott Glancy, Emanuel Knill
In [5], Gottesman, Kitaev, and Preskill described a method to encode a qubit in the continuous Hilbert space of an oscillator's position and momentum variables. This encoding provides a natural error correction scheme which can correct errors due to small

Surfaces of Fluorinated Pyridinium Block-Copolymers with Enhanced Antibacterial Activity

January 19, 2006
Author(s)
Sitaraman Krishnan, R J. Ward, A Hexemer, K E. Sohn, K L. Lee, E R. Angert, Daniel A. Fischer, E J. Kramer, Christopher K. Ober
Polystyrene-block-poly(4-vinylpyridine) copolymers were quaternized with 1-bromohexane and 6-perfluorooctyl-1-bromohexane. Surfaces prepared from these polymers were characterized by contact angle measurements, near-edge X-ray absorption fine structure

Wake Fields in the Electron Gas Including Transverse Response

January 19, 2006
Author(s)
Eric J. Cockayne, Zachary H. Levine
Relativistic electrons have transverse electric fields comparable in magnitude to the longitudinal fields. We determine the relative effects of transverse and longitudinal fields of a moving point charge on the dielectric response of a uniform electron gas

Enhanced ferromagnetic damping in Permalloy/Cu bilayers

January 18, 2006
Author(s)
Thomas Gerrits, Michael Schneider, Thomas J. Silva
We have investigated the enhancement of ferromagnetic damping for thin Permalloy (Ni 80Fe 20) films grown with Cu capping layers of variable thickness (5-1000nm). The measurements were performed with a pulsed inductive microwave magnetometer in the

Effect of tensile strain on grain connectivity and flux pinning in Bi 2 Sr 2 Ca 2 Cu 3 O x tapes

January 17, 2006
Author(s)
Daniel C. van der Laan, John (Jack) W. Ekin, Hans J. van Eck, M Dhalle, Bennie ten Haken, Michael W. Davidson, Justin Schwartz
The grain-to-grain connectivity in Bi 2Sr 2Ca 2Cu 3O x tapes is still poorly understood, even though they have been commercially available in long lengths for several years. This letter explains the effects of tensile strain on the grain-to-grain

First Principles Based Simulations of Relaxor Ferroelectrics

January 16, 2006
Author(s)
Benjamin P. Burton, Eric J. Cockayne, Silvia Tinte, U Waghmare
The phenomenology of Pb(B,B$ {\prime}$)O$_{3}$, perovskite based relaxor ferroelectrics is reviewed, with emphasis on the relationship between chemical short-range order and the formation of polar nanoregions in the temperature range between the freezing

Improved stabilization of a 1.3 um femtosecond optical frequency comb using spectrally tailored continuum from a nonlinear fiber grating

January 15, 2006
Author(s)
Kyoungsik Kim, Leo W. Hollberg, Scott A. Diddams, P. S. Westbrook, Jeffrey W. Nicholson
We report the significant enhancement ($+$24 dB) of the optical beat note between a 657-nm cw laser and the second-harmonic generation of the tailored continuum at 1314 nm generated with a femtosecond Cr:forsterite laser and a nonlinear fiber Bragg grating

Quantum key distribution at telecom wavelengths with noise-free detectors

January 13, 2006
Author(s)
Danna Rosenberg, Sae Woo Nam, Philip A. Hiskett, Charles G. Peterson, Richard J. Hughes, Jane E. Nordholt, Adriana Lita, Aaron J. Miller
The length of a secure link over which a quantum key can be distributed depends on the efficiency and dark-count rate of the detectors used at the receiver. We report on the first demonstration of quantum key distribution using transition-edge sensors with

Integration Testing of Object-Oriented Components Using Finite State Machines

January 12, 2006
Author(s)
Leonard J. Gallagher, A. J. Offutt, Anthony V. Cincotta
In object-oriented terms, one of the goals of integration testing is to ensure that messages from objects in one class or component are sent and received in the proper order and have the intended effect on the state of external objects that receive the

Curvature Enhanced Adsorbate Coverage Model for Electrodeposition

January 11, 2006
Author(s)
Thomas P. Moffat, Daniel Wheeler, Soo K. Kim, Daniel Josell
The impact of leveling additives acting through the traditional leveling mechanism of accumulation and consumption has been coupled with the Curvature Enhanced Accelerator Coverage (CEAC) mechanism previously used to explain bottom-up superfill of features
Displaying 34851 - 34875 of 73832
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