1,993 research outputs found
State Primary Stroke Center Policies in the US: Rural Health Issues.
Objective: To explore the relationship between state primary stroke center (PSC) designation policy implementation and access to optimal stroke care for residents of rural areas. Materials and Methods: Primary data were collected during the period September 2008âAugust 2009. Following content analysis of state PSC policies, four case study states were selected for fieldwork, in part for state rural healthcare access challenges. Variables included the barriers and facilitators to PSC designation policy implementation. More than 100 semistructured stakeholder interviews were conducted by teams of researchers. Large-group meetings were also observed. Interview summaries were reviewed by stakeholders for accuracy and completeness. Results: The consistent finding in all study states was that PSC designation and state policy implementation in rural areas are unlikely for a variety of reasons, including lack of financial resources for telemedicine, difficulty maintaining neurology coverage, and emergency departments unable to administer thrombolytics. Findings indicate recognition by states about the need for stroke-care public policy specific to telemedicine in rural areas. Conclusions: Although state PSC designation policies raise awareness of rural issues, designation policy alone cannot overcome the obstacle of rural access to optimal stroke care. States must be technology-ready, and providers need to embrace e-health and telemedicine to ensure coordination of care for stroke victims in rural areas. More important is that state policy makers should provide rules and regulations to encourage PSC hospitals to use telemedicine and âproxy credentialingâ to support their affiliated rural facilitie
Radiative neutron capture on a proton at BBN energies
The total cross section for radiative neutron capture on a proton, , is evaluated at big bang nucleosynthesis (BBN) energies. The
electromagnetic transition amplitudes are calculated up to next-to leading
order within the framework of pionless effective field theory with dibaryon
fields. We also calculate the cross section and the photon
analyzing power for the process from the amplitudes. The
values of low energy constants that appear in the amplitudes are estimated by a
Markov Chain Monte Carlo analysis using the relevant low energy experimental
data. Our result agrees well with those of other theoretical calculations
except for the cross section at some energies estimated by an
R-matrix analysis. We also study the uncertainties in our estimation of the
cross section at relevant BBN energies and find that the
estimated cross section is reliable to within 1% error.Comment: 21 pages and 12 eps figures; 6 eps figures and 2 references added,
and accepted for publication in Phys. Rev.
Magnetic properties of pure and Gd doped EuO probed by NMR
An Eu NMR study in the ferromagnetic phase of pure and Gd doped EuO was
performed. A complete description of the NMR lineshape of pure EuO allowed for
the influence of doping EuO with Gd impurities to be highlighted. The presence
of a temperature dependent static magnetic inhomogeneity in Gd doped EuO was
demonstrated by studying the temperature dependence of the lineshapes. The
results suggest that the inhomogeneity in 0.6% Gd doped EuO is linked to
colossal magnetoresistance. The measurement of the spin-lattice relaxation
times as a function of temperature led to the determination of the value of the
exchange integral J as a function of Gd doping. It was found that J is
temperature independent and spatially homogeneous for all the samples and that
its value increases abruptly with increasing Gd doping.Comment: 14 pages, 10 figures, to be published in Physical Review
The Instanton Molecule Liquid and "Sticky Molasses" Above T_c
The main objective of this work is to explore the evolution in the structure
of the quark-antiquark bound states in going down in the chirally restored
phase from the so-called "zero binding points" T_zb to the QCD critical
temperature T_c at which the Nambu-Goldstone and Wigner-Weyl modes meet. In
doing this, we adopt the idea recently introduced by Shuryak and Zahed for
charmed , light-quark mesons and
gluons that at T_zb, the quark-antiquark scattering length goes through
infinity at which conformal invariance is restored, thereby transforming the
matter into a near perfect fluid behaving hydrodynamically, as found at RHIC.
We show that the binding of these states is accomplished by the combination of
(i) the color Coulomb interaction, (ii) the relativistic effects, and (iii) the
interaction induced by the instanton-anti-instanton molecules. The spin-spin
forces turned out to be small. While near T_zb all mesons are large-size
nonrelativistic objects bound by Coulomb attraction, near T_c they get much
more tightly bound, with many-body collective interactions becoming important
and making the and masses approach zero (in the chiral limit).
The wave function at the origin grows strongly with binding, and the near-local
four-Fermi interactions induced by the instanton molecules play an increasingly
more important role as the temperature moves downward toward T_c.Comment: Contribution to QM2004 proceedings, 4 page
Radiative Neutron-Proton Capture in Effective Chiral Lagrangians
We calculate the cross-section for the thermal
process in chiral perturbation theory to next-to-next-to-leading order using
heavy-fermion formalism. The exchange current correction is found to be
in amplitude and the chiral perturbation at one-loop order
gives the cross section \sigma_{th}^{np}=(334\pm 2)\ {\mbox mb} which is in
agreement with the experimental value (334.2\pm 0.5)\ {\mbox mb}. Together
with the axial charge transitions, this provides a strong support for the power
of chiral Lagrangians for nuclear physics.Comment: 9 pages, revtex, uses epsfig.sty, 2 uuencoded figure
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How Do Foreign Accents Impact Perception and Credibility?
The paper aims to investigate how foreign accents impact perception and credibility by looking at various experiments that the researchers have conducted. To observe the effects that foreign accents have on listeners, we outlined three critical areas: visual and auditory stimuli, subtitle comprehension, and perception. By having an in-group or native accent as our control group, we were able to evaluate how various accents, such as Dutch and German, have a subtle impact on the accuracy of the speakers rated and measured by the participants. Based on our analysis, foreign-accented speakers are perceived to be less credible. In addition, it was concluded that perception also plays a key role in the day-to-day life of non-native speakers. While more research would be beneficial, it is clear that foreign accents reduce the speakersâ credibility and should be considered in environments such as job interviews and other social settings
Low-momentum Pion Enhancement Induced by Chiral Symmetry Restoration
The thermal and nonthermal pion production by sigma decay and its relation
with chiral symmetry restoration in a hot and dense matter are investigated.
The nonthermal decay into pions of sigma mesons which are popularly produced in
chiral symmetric phase leads to a low-momentum pion enhancement as a possible
signature of chiral phase transition at finite temperature and density.Comment: 3 pages, 2 figure
Exchange Current Corrections to Neutrino--Nucleus Scattering
Relativistic exchange current corrections to neutrino--nucleus cross sections
are presented assuming non--vanishing strange quark form factors for the
constituent nucleons. For charged current processes the exchange current
corrections can lower the impulse approximation results by 10\% while these
corrections are found to be sensitive to both the nuclear density and the
strange quark axial form factor of the nucleon for neutral current processes.
Implications on the LSND experiment to determine this form factor are
discussed.Comment: 11 pages, 2 figures, revtex 3.0, full postscript version of the file
and figures available at
http://www.nikhefk.nikhef.nl/projects/Theory/preprints/preprints.html To
appear in Phys. Rev. Lett
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