446 research outputs found
"The Gender of Illustration: Howard Pyle, Masculinity, and the Fate of American Art"
Eric J. Segal, "The Gender of Illustration: Howard Pyle, Masculinity, and the Fate of American Art". Please see the published version in Howard Pyle: American Master Rediscovered, edited by Heather Campbell Coyle (Wilmington: Delaware Art Museum; Philadelphia: Distributed by the University of Pennsylvania Press, 2011
An Atom Michelson Interferometer on a Chip Using a Bose-Einstein Condensate
An atom Michelson interferometer is implemented on an "atom chip." The chip
uses lithographically patterned conductors and external magnetic fields to
produce and guide a Bose-Einstein condensate. Splitting, reflecting, and
recombining of condensate atoms are achieved by a standing-wave light field
having a wave vector aligned along the atom waveguide. A differential phase
shift between the two arms of the interferometer is introduced by either a
magnetic-field gradient or with an initial condensate velocity. Interference
contrast is still observable at 20% with atom propagation time of 10 ms
Revealing buried information: Statistical processing techniques for ultracold gas image analysis
The techniques of principal and independent component analysis are applied to
images of ultracold atoms. As an illustrative example, we present the use of
these model-independent methods to rapidly determine the differential phase of
a BEC interferometer from large sets of images of interference patterns. These
techniques have been useful in the calibration of the experiment and in the
investigation of phase randomization. The details of the algorithms are
provided.Comment: v2: Many changes made to answer reviewer comments and improve
clarity. 29 pages, 9 figures v3: Small change to emphasize role of models in
result interpretation. 29 pages, 9 figure
Optimal Hypercontractivity for Fermi Fields and Related Non-Commutative Integration
Optimal hypercontractivity bounds for the fermion oscillator semigroup are
obtained. These are the fermion analogs of the optimal hypercontractivity
bounds for the boson oscillator semigroup obtained by Nelson. In the process,
several results of independent interest in the theory of non-commutative
integration are established. {}.Comment: 18 p., princeton/ecel/7-12-9
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