Multi-level study of C3H2: The first interstellar hydrocarbon ring

Cyclic species in the interstellar medium have been searched for almost since the first detection of interstellar polyatomic molecules. Eleven different C3H2 rotational transitions were detected; 9 of which were studied in TMC-1, a nearby dark dust cloud, are shown. The 1 sub 10 yields 1 sub 01 and 2 sub 20 yields 2 sub 11 transitions were observed with the 43 m NRAO telescope, while the remaining transitions were detected with the 14 m antenna of the Five College Radio Observatory (FCRAO). The lines detected in TMC-1 have energies above the ground state ranging from 0.9 to 17.1 K and consist of both ortho and para species. Limited maps were made along the ridge for several of the transitions. The HC3N J = 2 yields 1 transition were mapped simultaneously with the C3H2 1 sub 10 yields 1 sub 01 line and therefore can compare the distribution of this ring with a carbon chain in TMC-1. C3H2 is distributed along a narrow ridge with a SE - NW extension which is slightly more extended than the HC2N J = 2 yields 1. Gaussian fits gives a FWHP extension of 8'5 for C3H2 while HC3N has a FWHP of 7'. The data show variations of the two velocity components along the ridge as a function of transition. Most of the transitions show a peak at the position of strongest HC3N emission while the 2 sub 21 yields 2 sub 10 transition shows a peak at the NH3 position

A Bibliography for Mount Ktaadn

A list of articles that describe, at least briefly, Mount Katahdin in Maine. Includes a special index to articles that appeared in Appalachia, and a list of notable expeditions in chronological order, beginning with 1736

A Bibliography for Mt. Ktaadn, Revised

A list of articles that describe, at least briefly, Mount Katahdin in Maine. A revised version of a similar list that appeared in December, 1922. Reprinted from Appalachia, Appalachian Mountain Club, December, 1924

A Bibliography for Katahdin: Supplement

From the introduction: The titles here listed are supplementary to “A Bibliography for Mt. Ktaadn, Revised,” published in Appalachia, Vol. 16, No. 1, December, 1924. Many of the additions, of a scientific nature, for this supplement were very kindly furnished by Mr. Arthur H. Norton, of the Portland Society of Natural History, Portland, Maine. The spelling “Ktaadn,” appearing in the title of the earlier bibliography, was used by Briggs, Greenleaf, Hamlin, Harvey, Holley, Hubbard, Jackson, Lawrence, L. H. Merrill, C. E. Potter, Thoreau, and Trumbull. It was at one time in use by the Appalachian Mountain Club. The spelling “Katahdin” is in common use in the State of Maine. It was officially adopted by the United States Geographic Board April 4, 1893, and by the Appalachian Mountain Club in 1925

Hospital Community Benefits After the ACA: The Emerging Federal Framework

Outlines the federal framework on requirements for hospitals to provide community benefit activities in exchange for tax-exempt status under the 2010 healthcare reform, including community health needs assessments; state policy options; and challenges

Hospital Community Benefits After the ACA: Building on State Experience

Analyzes hospitals' requirements to conduct community health needs assessments, financial assistance and billing and collection policies, and community benefit reporting and oversight strategies. Notes implications for federal and state law and practice

Radio Signatures of HI at High Redshift: Mapping the End of the ``Dark Ages''

The emission of 21-cm radiation from a neutral intergalactic medium (IGM) at high redshift is discussed in connection with the thermal and ionization history of the universe. The physical mechanisms that make such radiation detectable against the cosmic microwave background include Ly_alpha coupling of the hydrogen spin temperature to the kinetic temperature of the gas and preheating of the IGM by the first generation of stars and quasars. Three different signatures are investigated in detail: (a) the fluctuations in the redshifted 21-cm emission induced by the gas density inhomogeneities that develop at early times in cold dark matter (CDM) dominated cosmologies; (b) the sharp absorption feature in the radio sky due to the rapid rise of the Ly_alpha continuum background that marks the birth of the first UV sources in the universe; and (c) the 21-cm emission and absorption shells that are generated on several Mpc scales around the first bright quasars. Future radio observations with projected facilities like the Giant Metrewave Radio Telescope and the Square Kilometer Array may shed light on the power spectrum of density fluctuations at z>5, and map the end of the "dark ages", i.e. the transition from the post-recombination universe to one populated with radiation sources.Comment: LateX, 19 pages, 5 figures, significantly revised version to be published in the Ap

Southern Rural Family Economic Well-Being in the Context of Public Assistance

As Congress considers reauthorization of public assistance legislation in 2002, researchers are challenged to provide data about the economic well-being of rural, low-income families. This paper provides findings from three southern states (Kentucky, Louisiana, and Maryland) currently participating in a 15-state, longitudinal study monitoring the economic well-being of rural families in the context of welfare reform of cash and food assistance. Initial findings reveal that even families using assistance to supplement their earned income fall short of self-sufficiency. These families are at-risk of living in economic crisis, or critical hardship, with inadequate earned and unearned income to meet their basic needs. Findings demonstrate that rurality and locality matter, that families vary widely in their use of assistance,and that economic self-sufficiency is unlikely in the foreseeable. The sample of 83 low-income families from five rural counties in three southern states demonstrates the variability both within and across rural counties and a range of needs and resources. These findings support the need for customizing the implementation of public assistance legislation designed to increase economic self-sufficiency and the well-being of southern rural families

Simulation of Asymptotically AdS5 Spacetimes with a Generalized Harmonic Evolution Scheme

Motivated by the gauge/gravity duality, we introduce a numerical scheme based on generalized harmonic evolution to solve the Einstein field equations on asymptotically anti-de Sitter (AdS) spacetimes. We work in global AdS5, which can be described by the (t,r,\chi,\theta,\phi) spherical coordinates adapted to the R{\times}S3 boundary. We focus on solutions that preserve an SO(3) symmetry that acts to rotate the 2-spheres parametrized by \theta,\phi. In the boundary conformal field theory (CFT), the way in which this symmetry manifests itself hinges on the way we choose to embed Minkowski space in R{\times}S3. We present results from an ongoing study of prompt black hole formation via scalar field collapse, and explore the subsequent quasi-normal ringdown. Beginning with initial data characterized by highly distorted apparent horizon geometries, the metrics quickly evolve, via quasi-normal ringdown, to equilibrium static black hole solutions at late times. The lowest angular number quasi-normal modes are consistent with the linear modes previously found in perturbative studies, whereas the higher angular modes are a combination of linear modes and of harmonics arising from non-linear mode-coupling. We extract the stress energy tensor of the dual CFT on the boundary, and find that despite being highly inhomogeneous initially, it nevertheless evolves from the outset in a manner that is consistent with a thermalized N=4 SYM fluid. As a first step towards closer contact with relativistic heavy ion collision physics, we map this solution to a Minkowski piece of the R{\times}S3 boundary, and obtain a corresponding fluid flow in Minkowski space