18,208 research outputs found
Medical Tourism in the Caribbean: A Call for Cooperation
Numerous Caribbean countries have discussed plans for developing medical tourism activities as a means of tourism diversification and economic development. These plans have been encouraged and shaped by outside agencies whose influence might cause a race-to-the-bottom environment between countries competing for the same niche of tourists. This paper provides a call for cooperation between local health officials in the Caribbean region to coordinate plans for the development of a medical tourism industry that enhances regional access to specialized healthcare and facilitates the movement of patients and healthcare resources throughout the region to enhance health equity and health outcomes in the Caribbean
Detection and Estimation Theory
Contains reports on two research projects.Joint Services Electronics Programs (U. S. Army, U. S. Navy, and U.S. Air Force)under Contract DA 28-043-AMC-02536(E
Hartree-Fock-Bogoliubov Model and Simulation of Attractive and Repulsive Bose-Einstein Condensates
We describe a model of dynamic Bose-Einstein condensates near a Feshbach
resonance that is computationally feasible under assumptions of spherical or
cylindrical symmetry. Simulations in spherical symmetry approximate the
experimentally measured time to collapse of an unstably attractive condensate
only when the molecular binding energy in the model is correct, demonstrating
that the quantum fluctuations and atom-molecule pairing included in the model
are the dominant mechanisms during collapse. Simulations of condensates with
repulsive interactions find some quantitative disagreement, suggesting that
pairing and quantum fluctuations are not the only significant factors for
condensate loss or burst formation. Inclusion of three-body recombination was
found to be inconsequential in all of our simulations, though we do not
consider recent experiments [1] conducted at higher densities
SDSS J1650+4251: A New Gravitational Lens
We report that the Sloan Digital Sky Survey quasar SDSS J165043.44+425149.3
is gravitationally lensed into two images, based on observations obtained with
the WIYN 3.5 m telescope at the Kitt Peak National Observatory. The lensed
quasar, at a redshift of z=1.54, appears as two images separated by 1.2" with
B-band magnitudes of 17.8 and 20.0. The lensing galaxy is clearly detected in
I-band images obtained in 0.3" seeing, after point spread function subtraction
of the two quasar images. A strong metal-line absorption system is also
identified in the unresolved SDSS spectrum of the double quasar, suggesting a
plausible lens redshift of z=0.58. The UBRI flux ratios of the pair vary
significantly from 8.5:1 in the blue to 5.4:1 in the red, a difference of 0.5
magnitudes, and may indicate the presence of microlensing in one or both quasar
components. The predicted differential time delay between quasar images is on
the order of one month, assuming the intervening absorption system is due to
the lensing galaxy.Comment: 15 pages (including 4 figures), submitted to the Astronomical Journa
Helical vs. fundamental solitons in optical fibers
We consider solitons in a nonlinear optical fiber with a single polarization
in a region of parameters where it carries exactly two distinct modes, the
fundamental one and the first-order helical mode. From the viewpoint of
applications to dense-WDM communication systems, this opens way to double the
number of channels carried by the fiber. Aside from that, experimental
observation of helical (spinning) solitons and collisions between them and with
fundamental solitons are issues of fundamental interest. We introduce a system
of coupled nonlinear Schroedinger equations for fundamental and helical modes,
which have nonstandard values of the cross-phase-modulation coupling constants,
and investigate, analytically and numerically, results of "complete" and
"incomplete" collisions between solitons carried by the two modes. We conclude
that the collision-induced crosstalk is partly attenuated in comparison with
the usual WDM system, which sometimes may be crucially important, preventing
merger of the colliding solitons into a breather. The interaction between the
two modes is found to be additionally strongly suppressed in comparison with
that in the WDM system in the case when a dispersion-shifted or
dispersion-compensated fiber is used.Comment: a plain latex file with the text and two ps files with figures.
Physica Scripta, in pres
Maps between Deformed and Ordinary Gauge Fields
In this paper, we introduce a map between the q-deformed gauge fields defined
on the GL-covariant quantum hyperplane and the ordinary gauge fields.
Perturbative analysis of the q-deformed QED at the classical level is presented
and gauge fixing la BRST is discussed. An other star product
defined on the hybrid % -plane is explicitly constructed .Comment: 10 page
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