69 research outputs found
Congestive Heart Failure Patient Education Intervention to Address 30 Day CHF Readmission
Introduction. The ACA Hospital Readmissions Reduction Program recently cut reimbursement for 30 day readmissions. Risk-adjusted congestive heart failure (CHF) 30-day readmission rate at Fletcher Allen Health Care (FAHC) in 2012 approached 22.2% among Medicare patients.https://scholarworks.uvm.edu/comphp_gallery/1203/thumbnail.jp
No Evidence of Quasar-Mode Feedback in a Four-Way Group Merger at z~0.84
We report on the results of a Chandra search for evidence of triggered
nuclear activity within the Cl0023+0423 four-way group merger at z ~ 0.84. The
system consists of four interacting galaxy groups in the early stages of
hierarchical cluster formation and, as such, provides a unique look at the
level of processing and evolution already under way in the group environment
prior to cluster assembly. We present the number counts of X-ray point sources
detected in a field covering the entire Cl0023 structure, as well as a
cross-correlation of these sources with our extensive spectroscopic database.
Both the redshift distribution and cumulative number counts of X-ray sources
reveal little evidence to suggest that the system contains X-ray luminous
active galactic nuclei (AGNs) in excess to what is observed in the field
population. If preprocessing is under way in the Cl0023 system, our
observations suggest that powerful nuclear activity is not the predominant
mechanism quenching star formation and driving the evolution of Cl0023
galaxies. We speculate that this is due to a lack of sufficiently massive
nuclear black holes required to power such activity, as previous observations
have found a high late-type fraction among the Cl0023 population. It may be
that disruptive AGN-driven outflows become an important factor in the
preprocessing of galaxy populations only during a later stage in the evolution
of such groups and structures when sufficiently massive galaxies (and central
black holes) have built up, but prior to hydrodynamical processes stripping
them of their gas reservoirs.Comment: Published in ApJ
Prospectus, March 16, 1988
https://spark.parkland.edu/prospectus_1988/1009/thumbnail.jp
Properties of Galaxies Hosting X-ray Selected Active Galactic Nuclei in the Cl1604 Supercluster at z=0.9
To investigate the role of feedback from Active Galactic Nuclei (AGN) in
driving the evolution of their host galaxies, we have carried out a study of
the environments and optical properties of galaxies harboring X-ray luminous
AGN in the Cl1604 supercluster at z~0.9. Making use of Chandra, HST/ACS and
Keck/DEIMOS observations, we examine the integrated colors, morphologies and
spectral properties of nine moderate-luminosity (L_x ~ 10^43 erg s^-1) type 2
Seyferts detected in the Cl1604 complex. We find that the AGN are predominantly
hosted by luminous spheroids and/or bulge dominated galaxies which have colors
that place them in the valley between the blue cloud and red sequence in
color-magnitude space, consistent with predictions that AGN hosts should
constitute a transition population. Half of the hosts have bluer overall colors
as a result of blue resolved cores in otherwise red spheroids and a majority
show signs of recent or pending interactions. We also find a substantial number
exhibit strong Balmer absorption features indicative of post-starburst
galaxies, despite the fact that we detect narrow [OII] emission lines in all of
the host spectra. If the [OII] lines are due in part to AGN emission, as we
suspect, then this result implies that a significant fraction of these galaxies
(44%) have experienced an enhanced level of star formation within the last ~1
Gyr which was rapidly suppressed. Overall we find that the properties of the
nine host galaxies are generally consistent with a scenario in which recent
interactions have triggered both increased levels of nuclear activity and an
enhancement of centrally concentrated star formation, followed by a rapid
truncation of the latter, possibly as a result of feedback from the AGN itself.
[Abridged]Comment: 15 pages, 9 Figures, submitted to Ap
Galaxy And Mass Assembly (GAMA): Self-Organizing Map Application on Nearby Galaxies
Galaxy populations show bimodality in a variety of properties: stellar mass,
colour, specific star-formation rate, size, and S\'ersic index. These
parameters are our feature space. We use an existing sample of 7556 galaxies
from the Galaxy and Mass Assembly (GAMA) survey, represented using five
features and the K-means clustering technique, showed that the bimodalities are
the manifestation of a more complex population structure, represented by
between 2 and 6 clusters.
Here we use Self Organizing Maps (SOM), an unsupervised learning technique
which can be used to visualize similarity in a higher dimensional space using a
2D representation, to map these five-dimensional clusters in the feature space
onto two-dimensional projections. To further analyze these clusters, using the
SOM information, we agree with previous results that the sub-populations found
in the feature space can be reasonably mapped onto three or five clusters. We
explore where the "green valley" galaxies are mapped onto the SOM, indicating
multiple interstitial populations within the green valley population.
Finally, we use the projection of the SOM to verify whether morphological
information provided by GalaxyZoo users, for example, if features are visible,
can be mapped onto the SOM-generated map. Voting on whether galaxies are
smooth, likely ellipticals, or "featured" can reasonably be separated but
smaller morphological features (bar, spiral arms) can not. SOMs promise to be a
useful tool to map and identify instructive sub-populations in multidimensional
galaxy survey feature space, provided they are large enough.Comment: 14 pages, 14 figures, accepted by MNRA
Galaxy and mass assembly (GAMA): Self-Organizing Map application on nearby galaxies
Galaxy populations show bimodality in a variety of properties: stellar mass, colour, specific star-formation rate, size, and Sérsic index. These parameters are our feature space. We use an existing sample of 7556 galaxies from the Galaxy and Mass Assembly (GAMA) survey, represented using five features and the K-means clustering technique, showed that the bimodalities are the manifestation of a more complex population structure, represented by between two and six clusters. Here we use Self-Organizing Maps (SOM), an unsupervised learning technique that can be used to visualize similarity in a higher dimensional space using a 2D representation, to map these 5D clusters in the feature space on to 2D projections. To further analyse these clusters, using the SOM information, we agree with previous results that the sub-populations found in the feature space can be reasonably mapped on to three or five clusters. We explore where the ‘green valley’ galaxies are mapped on to the SOM, indicating multiple interstitial populations within the green valley population. Finally, we use the projection of the SOM to verify whether morphological information provided by GalaxyZoo users, for example, if features are visible, can be mapped on to the SOM-generated map. Voting on whether galaxies are smooth, likely ellipticals, or ‘featured’ can reasonably be separated but smaller morphological features (bar, spiral arms) can not. SOMs promise to be a useful tool to map and identify instructive sub-populations in multidimensional galaxy survey feature space, provided they are large enough
Stillbirths: ending preventable deaths by 2030
Efforts to achieve the new worldwide goals for maternal and child survival will also prevent stillbirth and improve health and developmental outcomes. However, the number of annual stillbirths remains unchanged since 2011 and is unacceptably high: an estimated 2·6 million in 2015. Failure to consistently include global targets or indicators for stillbirth in post-2015 initiatives shows that stillbirths are hidden in the worldwide agenda. This Series paper summarises findings from previous papers in this Series, presents new analyses, and proposes specific criteria for successful integration of stillbirths into post-2015 initiatives for women’s and children’s health. Five priority areas to change the stillbirth trend include intentional leadership; increased voice, especially of women; implementation of integrated interventions with commensurate investment; indicators to measure effect of interventions and especially to monitor progress; and investigation into crucial knowledge gaps. The post-2015 agenda represents opportunities for all stakeholders to act together to end all preventable deaths, including stillbirths
Speech Communication
Contains reports on five research projects.C.J. Lebel FellowshipNational Institutes of Health (Grant 5 T32 NSO7040)National Institutes of Health (Grant 5 R01 NS04332)National Institutes of Health (Grant 5 R01 NS21183)National Institutes of Health (Grant 5 P01 NS13126)National Institutes of Health (Grant 1 PO1-NS23734)National Science Foundation (Grant BNS 8418733)U.S. Navy - Naval Electronic Systems Command (Contract N00039-85-C-0254)U.S. Navy - Naval Electronic Systems Command (Contract N00039-85-C-0341)U.S. Navy - Naval Electronic Systems Command (Contract N00039-85-C-0290)National Institutes of Health (Grant RO1-NS21183), subcontract with Boston UniversityNational Institutes of Health (Grant 1 PO1-NS23734), subcontract with the Massachusetts Eye and Ear Infirmar
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