8,748 research outputs found
Building a Culture of Evidence for Community College Student Success: Early Progress in the Achieving the Dream Initiative
Achieving the Dream is a multiyear, national initiative, launched by Lumina Foundation for Education, to help community college students stay in school and succeed. The 82 participating colleges commit to collecting and analyzing data to improve student outcomes, particularly for low-income students and students of color. This baseline report describes the early progress that the first 27 colleges have made after just one year of implementation
Deep GALEX Observations of the Coma Cluster: Source Catalog and Galaxy Counts
We present a source catalog from deep 26 ks GALEX observations of the Coma
cluster in the far-UV (FUV; 1530 A) and near-UV (NUV; 2310 A) wavebands. The
observed field is centered 0.9 deg (1.6 Mpc) south-west of the Coma core, and
has full optical photometric coverage with SDSS. The catalog consists of 9700
galaxies with GALEX and SDSS photometry, including 242
spectroscopically-confirmed Coma member galaxies that range from giant spirals
and elliptical galaxies to dwarf irregular and early-type galaxies. The full
multi-wavelength catalog (cluster plus background galaxies) is ~80% complete to
NUV=23 and FUV=23.5, and has a limiting depth at NUV=24.5 and FUV=25.0 which
corresponds to a star formation rate of ~0.001 Msun/yr at the distance of Coma.
Our deep GALEX observations required a two-fold approach to generating a source
catalog: we used a Bayesian deblending algorithm to measure faint and compact
sources (using SDSS coordinates as a position prior), and relied on the GALEX
pipeline catalog for bright/extended objects. We performed simulations to
assess the influence that systematic effects (e.g. object blends, source
confusion, Eddington Bias) have on source detection and photometry when using
both methods. The Bayesian deblending method roughly doubles the number of
source detections and provides reliable photometry to a few magnitudes deeper
than the GALEX pipeline catalog. This method is also free from source confusion
over the UV magnitude range studied here; conversely, we estimate that the
GALEX pipeline catalogs are confusion limited at magnitudes fainter than NUV~23
and FUV~24. We have measured the total UV galaxy counts using our catalog and
report a ~50% excess of counts across FUV=22-23.5 and NUV=21.5-23 relative to
previous GALEX measurements, which is not attributed to cluster member
galaxies. Our galaxy counts are a better match to deeper UV counts measured
with HST.Comment: 27 pages, 13 figures, 4 tables, accepted for publication in ApJ
Chiral Corrections to Baryon Masses Calculated within Lattice QCD
Consideration of the analytic properties of pion-induced baryon self energies
leads to new functional forms for the extrapolation of light baryon masses.
These functional forms reproduce the leading non-analytic behavior of chiral
perturbation theory, the correct non-analytic behavior at the threshold
and the appropriate heavy-quark limit. They involve only three unknown
parameters, which may be obtained by fitting lattice QCD data. Recent dynamical
fermion results from CP-PACS and UKQCD are extrapolated using these new
functional forms. We also use these functions to probe the limit of
applicability of chiral perturbation theory.Comment: 4 pages, 2 figures, Contribution to the Proceedings of the 15th
Particles and Nuclei International Conference (PANIC 99), Uppsala, Sweden,
June 10-16, 199
The 2s atomic level in muonic 208-Pb
Relative intensities and energy measurements of 2s level in muonic Pb-20
Deep UV Luminosity Functions at the Infall Region of the Coma Cluster
We have used deep GALEX observations at the infall region of the Coma cluster
to measure the faintest UV luminosity functions (LFs) presented for a rich
galaxy cluster thus far. The Coma UV LFs are measured to M_UV = -10.5 in the
GALEX FUV and NUV bands, or 3.5 mag fainter than previous studies, and reach
the dwarf early-type galaxy population in Coma for the first time. The
Schechter faint-end slopes (alpha = -1.39 in both GALEX bands) are shallower
than reported in previous Coma UV LF studies owing to a flatter LF at faint
magnitudes. A Gaussian-plus-Schechter model provides a slightly better
parametrization of the UV LFs resulting in a faint-end slope of ~ -1.15 in both
GALEX bands. The two-component model gives faint-end slopes shallower than -1
(a turnover) for the LFs constructed separately for passive and star forming
galaxies. The UV LFs for star forming galaxies show a turnover at M_UV ~ -14
owing to a deficit of dwarf star forming galaxies in Coma with stellar masses
below M*=10^8 Msun. A similar turnover is identified in recent UV LFs measured
for the Virgo cluster suggesting this may be a common feature of local galaxy
clusters, whereas the field UV LFs continue to rise at faint magnitudes. We did
not identify an excess of passive galaxies as would be expected if the missing
dwarf star forming galaxies were quenched inside the cluster. In fact, the LFs
for both dwarf passive and star forming galaxies show the same turnover at
faint magnitudes. We discuss the possible origin of the missing dwarf star
forming galaxies in Coma and their expected properties based on comparisons to
local field galaxies.Comment: accepted for publication in Ap
Dynamic variation of supernatant quality in a dairy shed waste stabilisation pond system
An intensive monitoring program of a standard two-stage dairy shed waste stabilisation pond system was undertaken to determine the incidence and extent of spatial and temporal variation of basic physio-chemical parameters, and to shed light on the longer term dynamic nature of in-pond conditions. The anaerobicâfacultative pond system, located in a remote rural area, treats wastewater from the hosing down and hydraulic flushing of the milking parlour and holding yard at the farm dairy shed. A number of multi-parameter water quality field monitoring probes were permanently deployed at various locations within the two ponds to enable continuous measurement of temperature, pH, conductivity and dissolved oxygen. In addition, profiling of the supernatant of both ponds was undertaken at different times of the year to examine vertical variation of the same parameters. Continuous monitoring revealed spatial homogeneity in EC and pH levels in the upper metre of both ponds. Physio-chemical parameters also appear to change uniformly across the ponds in response to external stimuli such as rainfall. Neither pond, however, exhibits homogeneity down the profile of the supernatant. Seasonal stratification is prevalent in the facultative pond suggesting poor vertical mixing, while the anaerobic pond is notably affected by sludge accumulation. A long-term pattern of rising conductivity in both ponds indicated accumulation of dissolved salt species in the system due to recirculation of reclaimed effluent for hydraulic flushing of the dairy shed. In the facultative pond, diurnal fluctuations in dissolved oxygen, oxidation-reduction potential and turbidity during warmer months of the year closely followed temperature swings. The extensive data collected in this study provides a detailed picture of the physio-chemical dynamics of two-stage stabilisation pond systems treating dairy shed wastewater
Codeless GPS Applications to Multi-Path: CGAMP
Cordless Global Positioning System (GPS) Applications to Multi-Path (CGAMP) is meeting the challenge of exploiting the L-band signals from the Global Positioning System (GPS) satellites for the measurement of the impulse response of radio transmission channels over space-Earth paths. This approach was originally suggested by E. K. Smith and has been pursued by J. Lemmon, without an affordable implementation being identifiable. In addition to the high cost of a suitable P code correlating GPS receiver, there is also the major impediment of the often announced Department of Defense policy of selective availability/anti-spoof (SA/AS) that clouds reliable access to the wideband (20 MHz) P channel of the GPS signals without cryptographic access. A technique proposed by MacDoran utilizes codeless methods for exploiting the P channel signals implemented by the use of a pair of antennas and cross correlation signal detection
Sex and Gender in Medical Education, and proceedings from the 2015 Sex and Gender Education Summit
The Sex and Gender Medical Education Summit: a roadmap for curricular innovation was a collaborative initiative of the American Medical Women\u27s Association, Laura W. Bush Institute for Women’s Health, Mayo Clinic, and Society for Women\u27s Health Research (www.sgbmeducationsummit.com). It was held on October 18–19, 2015 to provide a unique venue for collaboration among nationally and internationally renowned experts in developing a roadmap for the incorporation of sex and gender based concepts into medical education curricula. The Summit engaged 148 in-person attendees for the 1 1/2-day program. Pre- and post-Summit surveys assessed the impact of the Summit, and workshop discussions provided a framework for informal consensus building. Sixty-one percent of attendees indicated that the Summit had increased their awareness of the importance of sex and gender specific medicine. Other comments indicate that the Summit had a significant impact for motivating a call to action among attendees and provided resources to initiate change in curricula within their home institutions. These educational efforts will help to ensure a sex and gender basis for delivery of health care in the future
Giving Hope to Expectant Mothers: The Problem of Addiction in Our Community
According to 2015 drug overdose data, West Virginia held the highest rate of drug-related deaths in the country (41.5 per 100,000; CDC, 2016). The concern for drug addiction is particularly high in Cabell County, with approximately 13.78% of the population currently addicted to drugs (Huntington Police Department, 2016). Unfortunately, for many, this problem does not escape expectant mothers. Across the United States in 2013, an estimated seven of every 1,000 live births were diagnosed with neonatal abstinence syndrome (NAS; Reuters, 2015). In West Virginia, the rate is five times higher at 37 per 1,000 live births, and the rate within our county is even higher at 139 per 1,000 (Reuters, 2015). To work toward resolving this issue, we are working with 34 expectant mothers at Marshall OB-GYN who struggle with addiction. Our mission is to further educate and engage women in this oft-overlooked population. We will inform participants of how to obtain a GED, attend post-secondary school, and develop a resume. We will also create a bank of supportive/motivational text messages to facilitate discussion and engagement outside of the program. Additionally, we will create care packages for the expectant mothers. The packages will help ease an exacerbated life at the hospital, since an estimated 75% of these women will give birth to babies with NAS. Overall, our goal is to give hope to women who struggle with substance abuse by supplying them with the necessary support and information needed to better themselves
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