6,285 research outputs found
Behavior of the Escape Rate Function in Hyperbolic Dynamical Systems
For a fixed initial reference measure, we study the dependence of the escape
rate on the hole for a smooth or piecewise smooth hyperbolic map. First, we
prove the existence and Holder continuity of the escape rate for systems with
small holes admitting Young towers. Then we consider general holes for Anosov
diffeomorphisms, without size or Markovian restrictions. We prove bounds on the
upper and lower escape rates using the notion of pressure on the survivor set
and show that a variational principle holds under generic conditions. However,
we also show that the escape rate function forms a devil's staircase with jumps
along sequences of regular holes and present examples to elucidate some of the
difficulties involved in formulating a general theory.Comment: 21 pages. v2 differs from v1 only by additions to the acknowledgment
It’s Not Just the What but the How
White House Task Force to Protect Students From Sexual Assault looked to Prevention Innovations Research Center to evaluate efficacy of strategies for prevention and response to sexual violence on campus
IT_UMS IT Connections Newsletter_ May 2020
Screenshot of the University of Maine IT Newsletter Connections detailing the IT team\u27s efforts in response to COVID-19 and tips and guidance for staff when working from home.
Also includes email regarding the release of the newsletter sent to University of Maine System staff
Campus Community Readiness to Engage Measure: Its Utility for Campus Violence Prevention Initiatives—Preliminary Psychometrics
The researchers present preliminary psychometric information on a recently developed measure—the Campus Community Readiness to Engage Measure (CCREM)—which was developed as a tool for campuses to determine their readiness to address sexual assault (SA) and relationship abuse (RA). Participants were 353 community leaders and administrators at 131 colleges and universities across New England. Factor analytic results demonstrated that the CCREM had three factors for both SA and RA: denial (the campus community is unwilling to acknowledge that SA and RA are issues for the community), initiation (the campus community is beginning to create efforts to address SA and RA and some community members are involved), and sustainability (the campus has high levels of engagement from community members and longstanding efforts to address SA and RA). Whereas there was fair to moderate agreement among raters within the same community on the sustainability and initiation subscales, there was poor to fair agreement among raters within the same community on the denial subscale. Although additional measurement development research is needed, preliminary data suggest that the CCREM may be useful to campus communities in helping to initiate prevention initiatives and implement services related to SA and RA
IT_Important IT Resource Information Email
Email reminder sent to University of Maine System employees from University of Maine System Information Technology regarding the the availability of the IT Resources and Tools guide
The elusive old population of the dwarf spheroidal galaxy Leo I
We report the discovery of a significant old population in the dwarf
spheroidal (dSph) galaxy Leo I as a result of a wide-area search with the ESO
New Technology Telescope. Studies of the stellar content of Local Group dwarf
galaxies have shown the presence of an old stellar population in almost all of
the dwarf spheroidals. The only exception was Leo I, which alone appeared to
have delayed its initial star formation episode until just a few Gyr ago. The
color-magnitude diagram of Leo I now reveals an extended horizontal branch,
unambiguously indicating the presence of an old, metal-poor population in the
outer regions of this galaxy. Yet we find little evidence for a stellar
population gradient, at least outside R > 2' (0.16 kpc), since the old
horizontal branch stars of Leo I are radially distributed as their more
numerous intermediate-age helium-burning counterparts. The discovery of a
definitely old population in the predominantly young dwarf spheroidal galaxy
Leo I points to a sharply defined first epoch of star formation common to all
of the Local Group dSph's as well as to the halo of the Milky Way.Comment: 4 pages, 3 postscript figures, uses apjfonts.sty, emulateapj.sty.
Accepted for publication in ApJ Letter
Alien Registration- Gaudet, Antoinette M. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/24556/thumbnail.jp
Alien Registration- Gaudet, Antoinette M. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/24556/thumbnail.jp
Magellanic Cloud Periphery Carbon Stars IV: The SMC
The kinematics of 150 carbon stars observed at moderate dispersion on the
periphery of the Small Magellanic Cloud are compared with the motions of
neutral hydrogen and early type stars in the Inter-Cloud region. The
distribution of radial velocities implies a configuration of these stars as a
sheet inclined at 73+/-4 degrees to the plane of the sky. The near side, to the
South, is dominated by a stellar component; to the North, the far side contains
fewer carbon stars, and is dominated by the neutral gas. The upper velocity
envelope of the stars is closely the same as that of the gas. This
configuration is shown to be consistent with the known extension of the SMC
along the line of sight, and is attributed to a tidally induced disruption of
the SMC that originated in a close encounter with the LMC some 0.3 to 0.4 Gyr
ago. The dearth of gas on the near side of the sheet is attributed to ablation
processes akin to those inferred by Weiner & Williams (1996) to collisional
excitation of the leading edges of Magellanic Stream clouds. Comparison with
pre LMC/SMC encounter kinematic data of Hardy, Suntzeff, & Azzopardi (1989) of
carbon stars, with data of stars formed after the encounter, of Maurice et al.
(1989), and Mathewson et al. (a986, 1988) leaves little doubt that forces other
than gravity play a role in the dynamics of the H I.Comment: 30 pages; 7 figures, latex compiled, 1 table; to appear in AJ (June
2000
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