11,098 research outputs found
870 micron Imaging of a Transitional Disk in Upper Scorpius: Holdover from the Era of Giant Planet Formation?
We present 880 micron images of the transition disk around the star [PZ99]
J160421.7-213028, a solar-mass star in the nearby Upper Scorpius association.
With a resolution down to 0.34 arcsec, we resolve the inner hole in this disk,
and via model fitting to the visibilities and spectral energy distribution we
determine both the structure of the outer region and the presence of sparse
dust within the cavity. The disk contains about 0.1 Jupiter masses of
mm-emitting grains, with an inner disk edge of about 70 AU. The inner cavity
contains a small amount of dust with a depleted surface density in a region
extending from about 20-70 AU. Taking into account prior observations
indicating little to no stellar accretion, the lack of a binary companion, and
the presence of dust near 0.1 AU, we determine that the most likely mechanism
for the formation of this inner hole is the presence of one or more giant
planets.Comment: 12 pages, 7 figures. To appear in the Astrophysical Journa
The Development of the WISE (Writing to Inspire Successful Education) Writing Mentoring Program: A University-School Collaboration
Abstract
This paper describes the development of a service learning writing mentoring program designed to close the achievement gap in writing proficiency for economically disadvantaged seventh grade students. Compared to writing mentoring studies found in the published literature, this program has three distinguishing components. First, it focused on economically disadvantaged middle school students. Second, it provided writing mentoring through a university-school partnership in which college students provided the intervention in collaboration with a seventh-grade teacher. Third, the program used technology to facilitate the mentoring process. Over the course of an academic year, mentors created videos with feedback on 19 writing assignments. The writing mentoring program was associated with a four-fold increase in the percentage of students who were graded as âproficientâ on a state standardized writing exam. These results suggest that semi-virtual, intensive writing mentoring and individualized feedback from college students can close the achievement gap and improve the quality of middle level education provided to economically disadvantaged students
Engaging Science Faculty in Program Assessment â Planting Seeds and Cultivating Growth
This poster describes strategies to build faculty capacity in curriculum design and alignment and ways to plant the seeds for faculty collaboration and engagement in program assessment within the newly formed Astronomy BA & Astrophysics BS program in an effort to address the challenge of the difficulty students face in engaging faculty in discussion and planning of teaching and learning due to the nature of the program schedule. This poster provides personal insights and observed impact from efforts to effect change. In addition to providing examples in skill mapping, writing rubrics, curriculum alignment, and course deisgn, effective ways to engage willing faculty in using course assignments to investigate progress towards key student learning objectivese are also outlined
Drell-Yan, ZZ, W+W- production in SM & ADD model to NLO+PS accuracy at the LHC
In this paper, we present the next-to-leading order QCD corrections for
di-lepton, di-electroweak boson (ZZ, W+W-) production in both the SM and the
ADD model, matched to the HERWIG parton-shower using the aMC@NLO framework. A
selection of results at the 8 TeV LHC, which exhibits deviation from the SM as
a result of the large extra-dimension scenario are presented.Comment: 12 pages, 10 figures, search sensitivity for the 14 TeV LHC
discussed, version to appear in Eur. Phys. J.
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