22,941 research outputs found
Expanding Access to Dental Care for Patients on Suboxone
Those using Suboxone® for medication-assisted treatment for opioid dependence are at increased risk for poor oral health for a variety of reasons including lifestyle factors, effects of opioids and the direct impact of Suboxone® on the oral environment. Medication assisted addiction treatment programs do not regularly address these concerns. This project aims to educate patients about the importance of oral health, remind providers to screen for dental issues and make referrals for dental care and to promote oral health as an important aspect of well being in this vulnerable populationhttps://scholarworks.uvm.edu/fmclerk/1296/thumbnail.jp
Strong late-time circumstellar interaction in the peculiar supernova iPTF14hls
We present a moderate-resolution spectrum of the peculiar Type II supernova
iPTF14hls taken on day 1153 after discovery. This spectrum reveals the clear
signature of shock interaction with dense circumstellar material (CSM). We
suggest that this CSM interaction may be an important clue for understanding
the extremely unusual photometric and spectroscopic evolution seen over the
first 600 days of iPTF14hls. The late-time spectrum shows a double-peaked
intermediate-width H-alpha line indicative of expansion speeds around 1000
km/s, with the double-peaked shape hinting at a disc-like geometry in the CSM.
If the CSM was highly asymmetric, perhaps in a disc or torus that was ejected
from the star 3-6 years prior to explosion, then the CSM interaction could have
been overrun and hidden below the SN ejecta photosphere from a wide range of
viewing angles. In that case, CSM interaction luminosity would have been
thermalized well below the photosphere, possibly sustaining the high luminosity
without exhibiting the traditional observational signatures of strong CSM
interaction (narrow H-alpha emission and X-rays). Variations in density
structure of the CSM could account for the multiple rebrightenings of the
lightcurve. We propose that enveloped CSM interaction as seen in some recent
SNe, rather than an entirely new explosion mechanism, may be adequate to
explain the peculiar evolution of iPTF14hls.Comment: 6 pages, 5 figures, submitted to MNRAS with referee respons
Sortable Elements for Quivers with Cycles
Each Coxeter element c of a Coxeter group W defines a subset of W called the
c-sortable elements. The choice of a Coxeter element of W is equivalent to the
choice of an acyclic orientation of the Coxeter diagram of W. In this paper, we
define a more general notion of Omega-sortable elements, where Omega is an
arbitrary orientation of the diagram, and show that the key properties of
c-sortable elements carry over to the Omega-sortable elements. The proofs of
these properties rely on reduction to the acyclic case, but the reductions are
nontrivial; in particular, the proofs rely on a subtle combinatorial property
of the weak order, as it relates to orientations of the Coxeter diagram. The
c-sortable elements are closely tied to the combinatorics of cluster algebras
with an acyclic seed; the ultimate motivation behind this paper is to extend
this connection beyond the acyclic case.Comment: Final version as published. An error corrected in the previous
counterexample, other minor improvement
Mechanical and microscopic properties of the reversible plastic regime in a 2D jammed material
At the microscopic level, plastic flow of a jammed, disordered material
consists of a series of particle rearrangements that cannot be reversed by
subsequent deformation. An infinitesimal deformation of the same material has
no rearrangements. Yet between these limits, there may be a self-organized
plastic regime with rearrangements, but with no net change upon reversing a
deformation. We measure the oscillatory response of a jammed interfacial
material, and directly observe rearrangements that couple to bulk stress and
dissipate energy, but do not always give rise to global irreversibility.Comment: 5 pages, 4 figures. A supplemental PDF detailing methods, and movies
corresponding to Fig. 2(a, b, f), are availabl
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